A control system for a machine for winding electrical cables and the like, and a method of controlling the machine

Description

[0001] The present invention relates to machines for winding electrical cables and the like.

[0002] More specifically, the invention relates to a control system for an automatic winding machine of the type defined in the introductory part of the appended Claim 1.

[0003] In order to wind an electrical cable or the like onto the drum or core of a reel having end flanges, one end of the cable to be wound is fixed to the drum. The reel is then rotated about its own axis and a relative translatory motion between the reel and a cable guide is brought about in a direction parallel to the axis of rotation of the reel.

[0004] In practice, the perfect formation of adjacent turns on such a reel is hindered by a plurality of factors. The friction of the cable against the drum of the reel, against the underlying and adjacent turns, and against the end flanges may obstruct the running of the cable and give rise to uneven stratification of the turns.

[0005] Moreover, the interiors of electrical cables comprise stranded materials which, when they are pulled, tend to twist, imparting a rotation to the cable which can also upset the ordered and regular winding of the cable onto the reel.

[0006] Further causes of irregularities in the winding and stratification of the turns are connected with variations in the tension on the cable, the dimensional tolerances of the cable and of the reel, the fact that the flanges of the reel are not precisely parallel, and errors in the devices which control the reversal of the relative movement between the cable guide and the reel when the cable reaches the end flanges of the reel.

[0007] In order to carry out the winding correctly, the turns of a layer must be arranged side by side as evenly as possible so that the turns of the layer form as compact and uniform a surface as possible to constitute a good support for the next layer of turns. If this does not occur, during the winding of the next layer of turns, the cable may enter any spaces between turns of the preceding layer or be superposed on raised or overlapping portions of turns of the preceding layer and may be permanently deformed under the pressure of the successive layers of turns which may make it difficult subsequently to unwind the cable for use and/or may alter its internal characteristics, possibly compromising its functional characteristics.

[0008] When, in the course of the formation of a layer of turns, the cable approaches an end flange of the reel, it must not be jammed between the flange and the last turn wound. If this occurs, it may be difficult subsequently to unwind the cable from the reel for use and the structural and functional characteristics of the cable may be compromised.

[0009] In some cases, the inner face of an end flange of each reel onto which the electrical cables are wound has a so-called spiral in which the first turn is wound so that the end of the cable wound on the reel is accessible from the exterior. With these reels, the turns after the first turn have to be wound on the drum or core of the reel in the space between the spiral on one end flange and the other flange. During the formation of subsequent layers of turns the end turn of each layer which faces the spiral must not fall into the space surrounding the spiral since, if this occurs deformations and stretching may occur which could damage the cable.

[0010] Various automatic winding machines with artificial vision control systems have been proposed for winding electrical cables or the like onto reels automatically.

[0011] European patent application EP-A-0 129 926 describes a winding machine in which a luminous panel is disposed on one side of the reel and a television camera on the opposite side picks up the silhouette of a portion of the winding in the region of the step formed between the layer of turns being formed and the underlying layer at the point at which the cable is deposited on or supplied to the reel. The television camera is fixed to the cable guide on the axis (the axis x) of the relative motion between the cable guide and the reel and is movable relative to the cable guide in a direction (the axis y) perpendicular to that axis. A microprocessor system analyzes the silhouette of the portion of the winding framed and determines the position of a characteristic point belonging to the turn of the preceding layer onto which the turn being formed is to be deposited. If the position of the characteristic point is displaced from a predetermined position, the control system acts on the motor which controls the relative motion between the cable guide and the reel in order to return the characteristic point to an assigned position. This control is thus based on the indirect observation and the correction of the position of the turn which is being deposited.

[0012] European patent EP-B-0 043 368 describes an automatic winding machine with an artificial vision system comprising an illuminator which projects a light beam onto the reel and a television camera which picks up a portion of the light beam in the region of the last turn wound and, in particular, in the region of the step formed between the layer of turns being formed and the underlying layer. In this machine, the light beam is projected onto the reel and observed by the television camera at an angular position which is markedly offset from the region in which the cable is deposited on or supplied to the reel. According to this patent, the position of the turn being deposited is detected and the relative movement between the cable guide and the reel is regulated so that the angle at which the cable is supplied to the reel is kept precisely and permanently equal to a predetermined constant value.

[0013] English patent GB-B-2 221 227 (Ceat Cavi) describes a winding machine according to the introductory part of the appended Claim 1, having a vision system comprising a laser source which projects onto the reel a light beam which intersects the turns at the point at which the cable is supplied to or deposited on the reel.

[0014] In this machine, the processing and control system associated with the vision system also analyzes the image picked up and determines the position of the point at which the cable is deposited within a reference system and regulates the relative motion between the cable guide and the reel on the basis of the deviation detected between the observed position of the deposition point and an assigned position.

[0015] In this winding machine, as in that described in European application EP-A-0 129 926, the control system intervenes to modify the relative motion between the cable guide and the reel only after it has detected that the point at which the cable is supplied to the reel has moved, that is, after the turn being deposited has already overlapped or become separated from the preceding turn.

[0016] The correction of the relative motion thus achieved serves to prevent the winding from continuing incorrectly but the winding defect which has already occurred cannot be eliminated.

[0017] An object of the present invention is to provide an automatic winding machine of the type specified above, in which the control of the relative motion between the cable guide and the reel can prevent the formation of winding defects.

[0018] According to the invention, this object is achieved by means of a control system for a winding machine, the main characteristics of which are defined in the appended Claim 1.

[0019] A further subject of the invention is a method of winding a cable or the like evenly onto a reel in a winding machine, the characteristics of which are defined in the appended Claims 9 to 16.

[0020] Further characteristics and advantages of the invention will become clear from the detailed description which follows with reference to the appended drawings, provided purely by way of non-limiting example. In the drawings:

Figures 1 and 2 are a front view and a side view, respectively, of a winding machine having a control system according to the invention,

Figures 3 and 4 are a sectioned side view and a front view, respectively, of a reel during the winding of the electrical cable coming from a cable guide; Figure 4 also shows a perpendicular cartesian reference frame x, y fixed to the cable guide;

Figure 5 is a block diagram of an artificial vision and control system included in the winding machine according to the invention,

Figure 6 is a series of three graphs showing examples of curves of quantities monitored during the operation of the winding machine, as functions of time shown on the abscissa, and

Figure 7 is a perspective view of a reel with a spiral for the deposition of the first turn of the winding on an end flange.

[0021] With reference to Figures 1 and 2, in the embodiment illustrated, a winding machine (of known type) comprises a stationary support structure, generally indicated 1. The structure comprises two parallel vertical uprights 2 which have respective feet 2a at their lower ends for bearing on the floor or ground T and are interconnected at their tops by a pair of parallel cross-members 3 and 4.

[0022] A reel-holding carriage, generally indicated 5, is movable along the cross-members or guides 3 and 4. The carriage comprises, essentially, two parallel vertical arms 6 and 7, between the lower ends of which a reel 8 is supported rotatably for the winding of a cable or the like.

[0023] The arms 6 and 7 have respective wheels or rollers 6a and 7a (Figures 1 and 2) which can run on the cross-members 3 and 4 of the supporting structure 1 in a guided manner. The arms 6 and 7 are connected to respective internally-threaded sleeves 10 through which the ends of a worm screw 11 extend (Figure 1), the worm screw being arranged horizontally and being rotatable as a result of the operation of an associated electric motor 12. The arrangement is such that the operation of the motor 12 in one sense of rotation and in the opposite sense can move the arms 6 and 7 of the carriage 5 apart or towards each other, respectively, to enable a reel 8 to be loaded between their lower ends or to be removed therefrom.

[0024] During the normal operation of the machine, the motor 12 is de-activated and moves along the supporting structure 1 together with the arms 6 and 7.

[0025] A capstan 13 is disposed on the carriage 5 above the electric motor 12 (Figure 1) and a cable 12a, for example, of steel, the ends of which are connected to opposite ends of the stationary support structure 1, is wound thereon.

[0026] The capstan 13 is associated with an electric motor 14 which can rotate it in a controlled manner in one sense or the other in order correspondingly to move the carriage 5 to and fro along the cross-members or guides 3 and 4 of the support structure 1.

[0027] A further electric motor 15 for rotating the reel 8 is carried by the lower end of the vertical arm 6 of the carriage 5.

[0028] An angular-velocity sensor 16 such as a tachometric dynamo or a rotary encoder is associated with the end of the other arm 7 of the carriage 5.

[0029] As can better be seen in Figure 2, a cable guide, of known type, generally indicated 17, is fixed to the support structure 1. In particular, the cable guide comprises two output guide rollers, indicated 18 in Figures 1 to 3, between which the cable C to be wound onto the reel 8 extends.

[0030] The winding machine shown in Figures 1 and 2 is thus of the type in which the cable guide is fixed and the reel 8 is movable parallel to its axis, relative to the cable guide.

[0031] However, as will become clearer from the following, the invention is not limited to this type of arrangement but can also be put into effect in winding machines in which the cable guide is moved parallel to the axis of rotation of the reel.

[0032] A laser light source, indicated 20, is carried in a fixed position by the support structure 1. The source directs a laser beam towards the reel 8. The beam is indicated B in Figures 2 and 3. The source 20 has associated optical beam-spreader means by means of which a wide, thin light beam is projected onto the reel 8 and can illuminate the reel 8 and the cable C wound thereon longitudinally from one flange 8a to the other flange 8b throughout the travel of the reel 8 along the guide cross-members of the support structure 1.

[0033] In Figure 4, the line of light projected onto the end flanges of the reel and onto the cable already wound thereon is indicated L.

[0034] As can be seen in Figures 2 to 4, the source 20 is arranged in a manner such that the line of light L projected onto the reel 8 intersects the portion C1 of the cable C which is between the cable guide 17 and the reel 8 near the point Q at which the cable C is deposited on or supplied to the reel.

[0035] As is shown in Figure 3, the arrangement of the source 20 is such that the beam B intersects the portion C1 of the cable near the point Q at which the cable is deposited on the reel 8 throughout the winding of the cable, that is, for every layer of turns formed on the reel, starting from the innermost layer, shown in continuous outline, and up to the outermost layer, shown in broken outline.

[0036] A television camera 21 (Figures 2 and 5) which, conveniently, has an interference filter, is fixed on the support structure 1 in a position adjacent and offset from the laser source 20. The television camera 21 is arranged and oriented in a manner such that it frames the line of light L projected onto the reel, onto the cable already wound thereon, and onto the portion C1 of the cable supplied to the reel.

[0037] As shown in Figure 5, the television camera 21 is connected to a processing and control system, generally indicated 30, including image-signal processing devices which are arranged to analyze the signals supplied by the television camera. On the basis of the analysis of the signals, as will be seen, the processing and control system 30 monitors, in particular, the region in which the cable is supplied to or deposited on the reel and, by means of interface circuits 31, regulates the speed of the electric motor 14 which brings about the translatory motion of the reel 8 relative to the cable guide 17.

[0038] The sensor 16 is also connected to the processing and control system and supplies it with signals indicative of the speed of rotation of the reel.

[0039] Conveniently, the processing and control system 30 is formed with multiple-processor architecture, for example, in the manner described in detail in GB-B-2 221 227.

[0040] The hardware of the processing and control system 30 is equipped with a set of software programmes for processing the image signals by known techniques and algorithms including connectivity analysis, analysis of the greyness levels, and the detection of edges and other geometrical characteristics. In particular, the system is arranged to detect and describe the shape of the line L of light which is projected by the source 20 onto the reel and onto the cable in terms of cartesian co-ordinates within a reference frame x, y which is fixed to the television camera 21 and hence to the cable guide 17. The reference frame is shown schematically in Figure 4 and comprises an x axis parallel to the axis of rotation of the reel (and hence to the direction of the relative movement between the reel and the cable guide) and a y axis perpendicular thereto.

[0041] The processing and control system 30 is arranged, in particular, to determine, within the reference frame x, y, the co-ordinates of a characteristic point, indicated P in Figures 3 and 4, of the intersection of the light line L with the portion C1 of the cable C, near the point at which the cable is supplied to or deposited on the reel. In particular, the characteristic point may be (for example) the central point of the arc which represents the intersection of the light line L with the portion C1 of the cable C.

[0042] If the cable C has a diameter D and the speed of rotation of the reel 8 is Ω (radians/second), and provided that there is a minimum space δ between adjacent turns in each layer of the winding formed on the reel, (to take account of the dimensional tolerances of the cable), in operation, the entry point of the cable moves along the reel 8 (that is, parallel to the axis of rotation of the reel) at a velocity

[0043] The processing and control system 30 controls the motor 14 in a manner such that the relative translation of the reel 8 with respect to the cable guide 17 normally takes place at the velocity V_O.

[0044] The co-ordinate x_P of the point P relative to the reference system x, y fixed to the cable guide 17 must therefore remain permanently constant and equal to a value indicated x_O in Figure 4.

[0045] Conveniently, the value x_O assigned to the point P on the abscissa in the reference frame x, y fixed to the cable guide is different for each layer of turns formed on the reel 8 and can be determined experimentally beforehand, on the basis of the type and diameter of the cable, and stored in the processing and control system 30.

[0046] During the formation of a layer of turns, the processing and control system 30 determines the position x_P(t) and the velocity

of the characteristic point P.

[0047] On the basis of the data for the velocity of the point P relative to the axis x fixed to the cable guide, the processing and control system 30 can detect a tendency of the co-ordinate x_P of the point P to deviate from its assigned value x_O and can predict the magnitude of the deviation.

[0048] Due to the tolerances of the diameter and the surface irregularities of the cable, the instantaneous velocity of the point P relative to the axis x may be subject to appreciable variations. The processing and control system 30 is therefore conveniently arranged to consider, as the velocity of the point P relative to the axis x, a value obtained from a variable average calculated from a series of instantaneous values.

[0049] Naturally, if the cable is wound onto the reel evenly, the average velocity of the point P relative to the axis x is equal to zero.

[0050] If the average velocity V_P of the point P detected tends to be other than zero, and hence positive or negative, the processing and control system pilots the electric motor 14 in a manner such as to modify the velocity of the relative translation of the reel 8 with respect to the cable guide 17 in the manner which will now be described with reference to Figure 6.

[0051] In this drawing, the upper graph shows an example of a curve of the velocity V_P of the point P relative to the axis x, as a function of time t shown on the abscissa. The middle graph shows a corresponding curve of the velocity V_RT of the relative translation of the reel 8 relative to the cable guide 17 correspondingly imposed by the processing and control system 30 by means of the electric motor 14 controlled thereby.

[0052] As the graphs of Figure 6 show, as long as the velocity V_P of the point P is equal to zero or, in any case, is below a threshold ΔV, the processing and control system 30 keeps the velocity V_RT of the relative translation at the value V_O indicated above.

[0053] If the speed V_P of the point P exceeds the threshold ΔV (at the time t₁ in the graphs of Figure 6), the processing and control system 30 reduces the velocity V_RT of the relative translation from the value V_O. This reduction may, for example, be carried out with an initial downward slope (as shown between the times t₁ and t₂ in the middle graph of Figure 6) followed by a constant reduction (as shown after the time t₂).

[0054] The velocity V_RT of the relative translation is reduced for as long as the velocity V_P of the point P is substantially equal in magnitude to the variation imposed on the velocity of the relative translation, as shown at the time t₃ in Figure 6.

[0055] From the time at which the velocity of the point P started to increase from its assigned value of zero and up to the time t₃, the co-ordinate x_P of the point P is slightly greater than its assigned value x_O, as shown by the lower graph of Figure 6.

[0056] At the time t₃, the processing and control system causes a very rapid (theoretically instantaneous) change in the velocity of the relative translation of the reel relative to the cable guide 17 so that the co-ordinate x_P of the point P returns (theoretically instantaneously) to its assigned value x_O.

[0057] At this point the correction is completed.

[0058] At the start of the winding of the cable on the reel, the first turns are usually formed manually. In this condition, the processing and control system 30 is de-activated. After the first turn or turns have been formed, the reel 8 is brought, by the manual operation of the electric motor 14, to a position relative to the cable guide 17 in which the co-ordinate x_P of the point P is round about its assigned value x_O.

[0059] The automatic processing and control system 30 is then activated and causes the reel 8 to move relative to the cable guide 17 by the distance necessary to make the co-ordinate x_P of the point P coincide with its assigned value x_O. Naturally, at this stage, the processing and control system does not take account of the velocity V_P of the point P relative to the axis x.

[0060] As stated above, the value x_O assigned to the co-ordinate x_P of the point P is different for each layer of turns wound onto the reel. In fact, as can be seen, for example, from Figure 4, the turns of one layer are generally offset from those of the underlying layer.

[0061] The abscissa values assigned to the point P can be predetermined experimentally and stored in the processing and control system, or may be calculated by the system on the basis of the diameter D of the cable, the distance between the cable guide and the point at which the cable enters the reel, the helix angle β of the winding (Figure 4), and the diameter D_L of the layer.

[0062] The diameter of the layer may be calculated on the basis of the average of the co-ordinates on the axis y of homologous characteristic points of the intersections of the light line L with turns already deposited in the layer.

[0063] The helix angle β of the winding may be derived from the pitch of the helix which in turn can be derived by averaging the co-ordinates on the axis x of homologous characteristic points of the intersections of the light line L with turns already deposited.

[0064] When a layer of turns on the reel is completed and the deposition point of the cable is in correspondence with an end flange, the processing and control system 30 can detect the formation of the first turn of the next layer on the basis of the detection of the co-ordinates of the characteristic point P on the axes x and y.

[0065] As regards the reversal of the relative translation of the reel with respect to the cable guide 17 in order to form a new layer of turns, the processing and control system may conveniently also be arranged to control the reversal in the following manner.

[0066] In the course of the formation of a layer of turns, the processing and control system 30 determines the distance between the characteristic point P and the end flange of the reel towards which the point is moving. This is possible because the light line L also intersects the flange.

[0067] When the distance between the characteristic point P and the flange decreases to a predetermined value, the control system brings about a controlled reduction in the velocity of the relative translation of the reel 8 with respect to the cable guide 17. This involves an increase in the angle α at which the cable C is supplied to the reel, until the cable C is made to overlap the last turn deposited in order thus to form the first turn of the next layer. This enables the first turn of the next layer to be formed even without the cable striking the end flange of the reel.

[0068] After the formation of the first turn of the new layer has been detected, the control system 30 causes a rapid and controlled movement of the reel 8 relative to the cable guide 17 so as to cause the supply angle α of the cable C to assume a predetermined value with the opposite sign to its previous value. The deposition of the subsequent turns of the new layer is then controlled in the manner described above, naturally with the reel 8 translating relative to the cable guide in the opposite direction to that in which it moved previously.

[0069] The fact that the cable can be made to overlap the last turn deposited in order to start the formation of a new layer of turns without the cable C necessarily being brought into interaction with the end flange of the reel is of particular interest when the reel has a spiral on the inner face of an end flange for enabling a first turn to be formed in a manner such that the input end of the cable is in any case accessible from the exterior once the winding is completed.

[0070] Such a reel is shown in Figure 7. The inner face of the end flange 8a of the reel shown in this drawing has a projection 40 with a scroll-like or spiral external profile on which the input end C_O of the cable C is positioned. Starting from the end C_O, the cable follows the external profile of the projection 40 which is radially spaced from the axis of the reel by a progressively decreasing distance and, after it has completed a turn around this axis, at the point C₂,it is bent and passes onto the core or drum 8c of the reel to form the first turn of the first layer of the winding. The subsequent turns are formed on the core or drum 8c until the flange 8b is reached. The next layer of turns is wound onto the preceding layer from the flange 8b towards the projection 40 on the other flange 8a. The various layers of turns must be confined between the inner face of the flange 8b and the plane of the surface of the projection 40 which faces the flange 8b. In other words, when new layers of turns are started near the projection 40 of the flange 8a, it is important that the cable does not enter the space between the plane of the inner face of the flange 8a and the face of the projection 40 which faces the flange 8b.

[0071] The control technique described above for reversing the winding prevents this problem which might otherwise cause deformations and stretching which could damage the cable.

[0072] Naturally, the principle of the invention remaining the same, the forms of embodiment and details of construction may be varied widely with respect to those described and illustrated purely by way of non-limiting example, without thereby departing from the scope of the present invention.

Claims

1. A control system for a machine for winding electrical cables (C) and the like comprising

- support means (1, 5) for receiving and rotatably supporting a reel (8) with end flanges (8a, 8b),

- a cable guide (17),

- first drive means (15) for rotating the reel (8),

- second drive means (14) for bringing about a relative movement between the cable guide (17) and the reel (8), parallel to the axis of rotation of the reel (8), in operation;

the control system comprising

- sensor means (16) for monitoring the speed of rotation of the reel (8),

- a laser source (20) for illuminating the reel (8) from one end flange to the other (8a, 8b) so as to project a line of light (L) onto the turns wound onto the reel (8),

- at least one television camera (21) which is fixed to the cable guide (17) and can frame the portion of the reel (8) which is illuminated by the source (20), and

- a processing and control system (30, 31) which is connected to the sensor means (16) for monitoring the speed of rotation of the reel (8), and to the television camera (21), and includes image-signal processing means (30) which are arranged to analyze the signals supplied by the at least one television camera (21), the processing and control system (30, 31) being arranged to pilot the first and second drive means (15, 14) in a predetermined manner in dependence on the results of the analysis of the signals supplied by the at least one television camera (21);

the control system being characterized in that the source (20) is arranged in a manner such that the line of light (L) projected intersects the portion (C₁) of the cable (C) which is between the cable guide (17) and the reel (8), near the point (Q) at which the cable (C) is deposited on the reel (8), and in that the processing and control system (30, 31) is arranged:

- to determine the position of a characteristic point (P) of the intersection of the line of light (L) with the portion (C1) of the cable (C), relative to a first reference axis (x) parallel to the axis of the reel (8) and fixed to the cable guide (17);

- to calculate the velocity (V_P) of the movement of the characteristic point (P) relative to the axis (x);

- to control the second drive means (14) so as to bring about a relative movement between the cable guide (17) and the reel (8) at a nominal velocity (V_O) which depends upon the diameter (D) of the cable (C) and is proportional to the speed of rotation (Ω) of the reel (8), when the characteristic point (P) remains in a constant and predetermined reference position (x_O) relative to the axis (x) and its velocity (V_P) is substantially zero.

2. A control system according to Claim 1, characterized in that the processing and control system (30, 31) is also arranged to bring about a variation in the relative velocity (V_RT) between the cable guide (17) and the reel (8) when the velocity (V_P) of the characteristic point (P) relative to the axis (x) exceeds a predetermined threshold (ΔV), the variation having the opposite sign to the velocity (V_P) of the characteristic point (P) and being brought about for as long as the velocity (V_P) of the characteristic point (P) is substantially equal in magnitude to the variation imposed on the relative velocity (V_RT) between the cable guide (17) and the reel (8), and then to return the relative velocity (V_RT) between the cable guide (17) and the reel (8) rapidly to the nominal value (V_O) and subsequently to bring about a rapid relative translation between the cable guide (17) and the reel (8) so as to return the characteristic point (P) to the reference position (x_O) relative to the axis (x).

3. A control system according to Claim 2, characterized in that the processing and control system (30, 31) is arranged to compare the instantaneous position (x_P) of the characteristic point (P) with a different constant reference position (x_O) for each layer of turns wound onto the reel (8).

4. A control system according to Claim 3, characterised in that the processing and control system (30, 31) is arranged to compare the instantaneous position (x_P) of the characteristic point (P) with a constant reference position (x_O) which is tabulated and stored for each layer according to the characteristics of the cable (C), particularly its diameter (D).

5. A control system according to any one of the preceding claims, characterized in that the processing and control system (30, 31) is also arranged

- to determine the co-ordinate (Y_P) of the characteristic point (P) relative to a second reference axis (y) perpendicular to the first (x), and

- to detect the formation of the first turn of a new layer of turns on the basis of the observation of the variations of the co-ordinates of the characteristic point (P) relative to the first and second axes (x, y).

6. A control system according to Claims 3 and 5, characterized in that the processing and control system (30, 31) is arranged to determine the co-ordinates relative to the second reference axis (y) of homologous characteristic points of the intersections of the light line (L) with turns of the winding layer which is being deposited and to calculate the diameter of the layer on the basis of the co-ordinates.

7. A control system according to any one of the preceding claims, characterized in that the processing and control system (30, 31) is also arranged

- to determine the distance between the characteristic point (P) and the end flange (8a, 8b) of the reel (8); and

- to bring about a controlled reduction in the relative velocity between the cable guide (17) and the reel (8) when the distance between the characteristic point (P) and a flange (8a, 8b) decreases to a predetermined value, so as to increase the angle (α) at which the cable (C) is supplied to the reel (8) until the cable (C) is caused to overlap the last turn of the preceding layer in order to form the first turn of the next layer.

8. A control system according to Claims 5 and 7, characterized in that the processing and control system (30, 31) is also arranged, after it has detected the formation of the first turn of a new layer, to cause a rapid and controlled relative movement between the reel (8) and the cable guide (17) so as to cause the angle (α) at which the cable (C) is supplied to the reel (8) to assume a predetermined value with the opposite sign to its previous value.

9. A method of forming a regular winding of an electrical cable (C) or the like on a reel (8) in a winding machine (1) which comprises support means (1) for receiving and rotatably supporting a reel (8) with end flanges (8a, 8b) and which has drive means (14, 15) for rotating the reel (8) and translating it relative to a cable guide (17), parallel to the axis of rotation of the reel (8);
the method comprising the steps of:

- projecting a line of light (L) from one end flange (8a) of the reel (8) to the other (8b) in a manner such that the line of light (L) extends over the turns wound onto the reel (8),

- framing the portion of the reel (8) on which the line of light (L) extends with at least one television camera (21) fixed to the cable guide (17) in order to generate corresponding image signals,

- processing and analyzing the image signals,

- piloting the drive means (14, 15) in a predetermined manner in dependence on the results of the analysis of the image signals;

the method being characterized in that the line of light (L) is projected in a manner such that it intersects the portion (C1) of the cable (C) which extends between the cable guide (17) and the reel (8) near the point (Q) at which the cable (C) is deposited on the reel (8), and in that it also comprises the steps of:

- determining the position of a characteristic point (P) of the intersection of the line of light (L) with the portion (C1) of the cable (C), relative to a first reference axis (x) parallel to the axis of the reel (8) and fixed to the cable guide (17);

- calculating the velocity of the movement (V_P) of the characteristic point (P) relative to the axis (x);

- controlling the second drive means (14) so as to bring about a relative movement between the cable guide (17) and the reel (8) at a nominal velocity (V_O) which depends upon the diameter (D) of the cable (C) and is proportional to the speed of rotation (Ω) of the reel (8) when the characteristic point (P) remains in a constant and predetermined reference position (x_O) relative to the axis (x) and its velocity (V_P) is substantially zero.

10. A method according to Claim 9, also characterized by the steps of

- bring about a variation in the relative velocity (V_RT) between the cable guide (17) and the reel (8) when the velocity (V_P) of the characteristic point (P) relative to the axis (x) exceeds a predetermined threshold (Δv), the variation having the opposite sign to the velocity (V_P) of the characteristic point (P) and being brought about for as long as the velocity (V_P) of the characteristic point (P) is substantially equal in magnitude to the variation imposed on the relative velocity (V_RT) between the cable guide (17) and the reel (8), and then to bring about a rapid return of the relative velocity (V_RT) to the nominal value (V_O) and subsequently to bring about a rapid relative translation between the cable guide (17) and the reel (8) so as to return the characteristic point (P) to the reference position (x_O) relative to the axis (x).

11. A method according to Claim 10, characterized in that the instantaneous position (x_P) of the characteristic point (P) is compared with a different constant reference position (x_O) for each layer of turns wound onto the reel (8).

12. A method according to Claim 11, characterized in that the reference position (x_O) for the characteristic point (P) is tabulated and stored for each layer, according to the characteristics of the cable (C), particularly its diameter (D).

13. A method according to one of Claims 9 to 12, characterized in that the co-ordinate (y_P) of the characteristic point (P) relative to a second reference axis (y) perpendicular to the first axis (x) is detected and in that the formation of the first turn of a new winding layer is detected on the basis of the observation of the co-ordinates (x_P, y_P) of the characteristic point (P).

14. A method according to Claims 11 and 12, in which the co-ordinates, relative to the second reference axis (y), of homologous characteristic points of the intersection of the line of light (L) with the turns of the winding layer which is being deposited, are determined and the diameter of the layer is calculated on the basis of these co-ordinates.

15. A method according to one of Claims 9 to 14, in which the distance between the characteristic point (P) and the end flanges (8a, 8b) of the reel (8) is determined and in which a controlled reduction in the relative velocity of the reel (8) with respect to the cable guide (17) is brought about when the distance between the characteristic point (P) and a flange decreases to a predetermined value so as to increase the angle (α) at which the cable (C) is supplied to the reel (8) until the cable (C) is caused to overlap the last turn of the preceding layer in order to form the first turn of the next layer.

16. A method according to Claims 13 and 15, characterized in that, after the formation of the first turn of a new layer has been detected, a rapid movement of the reel (8) relative to the cable guide (17) is brought about so as to cause the angle (α) at which the cable (C) is supplied to the reel (8) to assume a predetermined value with the opposite sign to its previous value.

Ansprüche

1. Steuerungssystem für eine Maschine zum Aufwickeln elektrischer Kabel (C) und dergleichen, umfassend

- Trägermittel (1, 5) zum Aufnehmen und drehbaren Lagern einer Trommel (8) mit Endflanschen (8a, 8b),

- eine Kabelführung (17),

- erste Antriebsmittel (15) zum Drehen der Trommel (8),

- zweite Antriebsmittel (14), um im Betrieb eine Relativbewegung zwischen der Kabelführung (17) und der Trommel (8), parallel zur Drehachse der Trommel (8), zu bewirken;

wobei das Steuerungssystem umfaßt

- Sensormittel (16) zum Überwachen der Drehgeschwindigkeit der Trommel (8),

- eine Laserquelle (20) zum Beleuchten der Trommel (8) von einem Endflansch zum anderen (8a, 8b), um so eine Lichtlinie (L) auf die auf der Trommel (8) aufgewickelten Windungen zu projizieren,

- mindestens eine Fernsehkamera (21), die an der Kabelführung (17) fixiert ist und den Teil der Trommel (8) aufnehmen kann, der durch die Quelle (20) beleuchtet wird, und

- ein Verarbeitungs- und Steuerungssystem (30, 31), das mit den Sensormitteln (16) zum Überwachen der Drehgeschwindigkeit der Trommel (8) und mit der Fernsehkamera (21) verbunden ist und Bildsignalverarbeitungsmittel (30)umfaßt, die so eingerichtet sind, daß sie die Signale, die von der zumindest einen Fernsehkamera (21) geliefert werden, analysieren, wobei das Verarbeitungs- und Steuerungssystem (30, 31) so eingerichtet ist, daß es die ersten und zweiten Antriebsmittel (15, 14) in vorbestimmter Weise abhängig von den Ergebnissen der Analyse der Signale, die von der zumindest einen Fernsehkamera (21) geliefert werden, steuert;

wobei das Steuerungssystem dadurch gekennzeichnet ist, daß die Quelle (20) in einer Weise angeordnet ist, daß die projizierte Lichtlinie (L) den Teil (C₁) des Kabels (C) schneidet, der sich zwischen der Kabelführung (17) und der Trommel (8) befindet, nahe dem Punkt (Q), bei dem das Kabel (C) auf der Trommel (8) abgelegt wird, und daß das Verarbeitungs- und Steuerungssystem (30, 31) eingerichtet ist:

- um die Position eines charakteristischen Punkts (P) des Schnitts der Lichtlinie (L) mit dem Teil (C1) des Kabels (C), bezüglich einer ersten Bezugsachse (x), parallel zur Achse der Trommel (8) und fixiert an der Kabelführung (17), zu bestimmen;

- um die Geschwindigkeit (V_p) der Bewegung des charakteristischen Punktes (P) bezüglich der Achse (x) zu berechnen;

- um die zweiten Antriebsmittel (14) zu steuern, um eine Relativbewegung zwischen der Kabelführung (17) und der Trommel (8) mit einer Nominalgeschwindigkeit (V₀) zu bewirken, die vom Durchmesser (D) des Kabels (C) abhängt und proportional zur Drehgeschwindigkeit (Ω) der Trommel (8) ist, wenn der charakteristische Punkt (P) in einer konstanten und vorbestimmten Bezugsposition (x₀) bezüglich der Achse (x) verbleibt und seine Geschwindigkeit (V_p) im wesentlichen null ist.

2. Steuerungssystem gemäß Anspruch 1, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) auch so eingerichtet ist, daß es eine Änderung der Relativgeschwindigkeit (V_RT) zwischen der Kabelführung (17) und der Trommel (8) bewirkt, wenn die Geschwindigkeit (V_p) des charakteristischen Punkts (P) bezüglich der Achse (x) eine vorbestimmte Schwelle (ΔV) übersteigt, wobei die Änderung das entgegengesetzte Vorzeichen zur Geschwindigkeit (V_p) des charakteristischen Punkts (P) hat und so lange bewirkt wird, als die Geschwindigkeit (V_p) des charakteristischen Punkts (P) im wesentlichen in der Größe gleich zu der der Relativgeschwindigkeit (V_RT) zwischen der Kabelführung (17) und der Trommel (8) auferlegten Änderung ist, und daß es dann die Relativgeschwindigkeit (V_RT) zwischen der Kabelführung (17) und der Trommel (8) schnell auf den Nominalwert (V₀) zurückführt und anschließend eine schnelle Relativverschiebung zwischen der Kabelführung (17) und der Trommel (8) bewirkt, um den charakteristischen Punkt (P) zur Bezugsposition (x₀) bezüglich der Achse (x) zurückzuführen.

3. Steuerungssystem gemäß Anspruch 2, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) so eingerichtet ist, daß es die augenblickliche Position (x_p) des charakteristischen Punkts (P) mit einer unterschiedlichen konstanten Bezugsposition (x₀) für jede Lage von auf der Trommel (8) aufgewickelten Windungen vergleicht.

4. Steuerungssystem gemäß Anspruch 3, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuetungssystem (30, 31) so eingerichtet ist, daß es die augenblickliche Position (x_p) des charakteristischen Punkts (P) mit einer konstanten Bezugsposition (x₀) vergleicht, die für jede Lage gemäß den Charakteristiken des Kabels (C), insbesondere seinem Durchmesser (D), tabelliert und gespeichert ist.

5. Steuerungssystem gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) auch so eingerichtet ist,

- daß die Koordinate (Y_p) des charakteristischen Punkts (P) bezüglich einer zweiten Bezugsachse (y), die rechtwinkelig zur ersten (x) ist, bestimmt wird, und

- daß die Bildung der ersten Windung einer neuen Lage von Windungen auf Basis der Beobachtung der Änderungen der Koordinaten des charakteristischen Punkts (P) bezüglich der ersten und zweiten Achse (x, y) detektiert wird.

6. Steuerungssystem gemäß Ansprüchen 3 und 5, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) so eingerichtet ist, daß die Koordinaten bezuglich der zweiten Bezugsachse (y) von homologen charakteristischen Punkten der Schnitte der Lichtlinie (L) mit Windungen der Wicklungslage, die abgelegt wird, bestimmt werden und der Durchmesser der Lage auf Basis der Koordinaten berechnet wird.

7. Steuerungssystem gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) auch so eingerichtet ist,

- daß der Abstand zwischen dem charakteristischen Punkt (P) und dem Endflansch (8a, 8b) der Trommel (8) bestimmt wird; und

- daß eine gesteuerte Verminderung der Relativgeschwindigkeit zwischen der Kabelführung (17) und der Trommel (8) bewirkt wird, wenn der Abstand zwischen dem charakteristischen Punkt (P) und einem Flansch (8a, 8b) auf einen vorbestimmten Wert abnimmt, um so den Winkel (α) zu erhöhen, mit dem das Kabel (C) der Trommel (8) zugeführt wird, so lange bis das Kabel (C) die letzte Windung der vorangehenden Lage überlappt, um die erste Windung der nächsten Lage zu bilden.

8. Steuerungssystem gemäß Ansprüchen 5 und 7, dadurch gekennzeichnet, daß das Verarbeitungs- und Steuerungssystem (30, 31) auch so eingerichtet ist, daß es, nachdem es die Bildung der ersten Windung einer neuen Lage detektiert hat, eine schnelle und gesteuerte Relativbewegung zwischen der Trommel (8) und der Kabelführung (17) verursacht, so daß der Winkel (α), mit dem das Kabel (C) der Trommel (8) zugeführt wird, einen vorbestimmten Wert mit entgegengesetztem Vorzeichen zu seinem vorigen Wert annimmt.

9. Verfahren zur Bildung einer regelmäßigen Aufwicklung eines elektrischen Kabels (C) oder dergleichen auf einer Trommel (8) in einer Aufwickelmaschine (1), die Trägermittel (1) zum Aufnehmen und drehbaren Lagern einer Trommel (8) mit Endflanschen (8a, 8b) umfaßt und Antriebsmittel (14, 15) zum Drehen der Trommel (8) und zu ihrem Verschieben bezuglich einer Kabelführung (17), parallel zur Drehachse der Trommel (8), aufweist; wobei das Verfahren die Schritte umfaßt:

- Projizieren einer Lichtlinie (L) von einem Endflansch (8a) der Trommel (8) zum anderen (8b) in einer Weise, daß sich die Lichtlinie (L) über die auf der Trommel (8) aufgewickelten Windungen erstreckt,

- Aufnehmen des Teils der Trommel (8), über den sich die Lichtlinie (L) erstreckt, mit mindestens einer Fernsehkamera (21), die auf der Kabelführung (17) fixiert ist, um entsprechende Bildsignale zu erzeugen,

- Verarbeiten und Analysieren der Bildsignale,

- Steuern der Antriebsmittel (14, 15) in einer vorbestimmten Weise abhängig von den Ergebnissen der Analyse der Bildsignale;

wobei das Verfahren dadurch gekennzeichnet ist, daß die Lichtlinie (L) in einer Weise projiziert wird, daß sie den Teil (C1) des Kabels (C) schneidet, der sich zwischen der Kabelführung (17) und der Trommel (8) nahe dem Punkt (Q) erstreckt, bei dem das Kabel (C) auf der Trommel (8) abgelegt wird, und daß es auch die Schritte umfaßt:

- Bestimmen der Position des charakteristischen Punkts (P) auf dem Schnitt der Lichtlinie (L) mit dem Teil (C1) des Kabels (C), bezüglich einer ersten Bezugsachse (x), parallel zur Achse der Trommel (8) und fixiert an der Kabelführung (17);

- Berechnen der Geschwindigkeit der Bewegung (V_p) des charakteristischen Punkts (P) bezüglich der Achse (x);

- Steuern der zweiten Antriebsmittel (14), um so eine Relativbewegung zwischen der Kabelführung (17) und der Trommel (8) mit einer Nominalgeschwindigkeit (V₀) zu bewirken, die vom Durchmesser (D) des Kabels (C) abhängt und proportional zur Drehgeschwindigkeit (Ω) der Trommel (8) ist, wenn der charakteristische Punkt (P) in einer konstanten und vorbestimmten Bezugsposition (x₀) bezüglich der Achse (x) verbleibt und seine Geschwindigkeit (V_p) im wesentlichen null ist.

10. Verfahren gemäß Anspruch 9, auch gekennzeichnet durch die Schritte

- Bewirken einer Änderung der Relativgeschwindigkeit (V_RT) zwischen der Kabelführung (17) und der Trommel (8), wenn die Geschwindigkeit (V_p) des charakteristischen Punktes (P) bezüglich der Achse (x) eine vorbestimmte Schwelle (Δv) überschreitet, wobei die Änderung das entgegengesetzte Vorzeichen zur Geschwindigkeit (V_p) des charakteristischen Punktes (P) aufweist und so lange bewirkt wird, als die Geschwindigkeit (V_p) des charakteristischen Punktes (P) im wesentlichen in der Größe gleich zu der der Relativgeschwindigkeit (V_RT) zwischen der Kabelführung (17) und der Trommel (8) auferlegten Änderung ist, und dann Bewirken einer schnellen Rückkehr der Relativgeschwindigkeit (V_RT) auf den Nominalwert (V₀) und anschließendes Bewirken einer schnellen Relativverschiebung zwischen der Kabelführung (17) und der Trommel (8), um so den charakteristischen Punkt (P) auf die Bezugsposition (x₀) bezüglich der Achse (x) zurückzuführen.

11. Verfahren gemäß Anspruch 10, dadurch gekennzeichnet, daß die augenblickliche Position (x_p) des charakteristischen Punktes (P) mit einer unterschiedlichen konstanten Bezugsposition (x₀) für jede Lage von auf der Trommel (8) aufgewickelten Windungen verglichen wird.

12. Verfahren gemäß Anspruch 11, dadurch gekennzeichnet, daß die Bezugsposition (x₀) für den charakteristischen Punkt (P) für jede Lage, gemäß den Charakteristiken des Kabels (C), insbesondere seinem Durchmesser (D), tabelliert und gespeichert ist.

13. Verfahren gemäß einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Koordinate (y_p) des charakteristischen Punktes (P) bezüglich einer zweiten Bezugsachse (y), die rechtwinkelig zur ersten Achse (x) ist, detektiert wird und daß die Bildung der ersten Windung einer neuen Wicklungslage auf der Basis der Beobachtung der Koordinaten (x_p, y_p) des charakteristischen Punktes (p) detektiert wird.

14. Verfahren gemäß Ansprüchen 11 und 12, worin die Koordinaten, bezüglich der zweiten Bezugsachse (y), von homologen charakteristischen Punkten des Schnitts der Lichtlinie (L) mit den Windungen der Wicklungslage, die abgelegt wird, bestimmt werden und der Durchmesser der Lage auf Basis dieser Koordinaten berechnet wird.

15. Verfahren gemäß einem der Ansprüche 9 bis 14, worin der Abstand zwischen dem charakteristischen Punkt (P) und den Endflanschen (8a, 8b) der Trommel (8) bestimmt wird und worin eine gesteuerte Verminderung der Relativgeschwindigkeit der Trommel (8) bezüglich der Kabelführung (17) bewirkt wird, wenn der Abstand zwischen dem charakteristischen Punkt (P) und einem Flansch auf einen vorbestimmten Wert abnimmt, um so den Winkel (α), mit dem das Kabel (C) der Trommel (8) zugeführt wird, zu vergrößern, so lange bis das Kabel (C) die letzte Windung der vorangehenden Lage überlappt, um die erste Windung der neuen Lage zu bilden.

16. Verfahren gemäß Ansprüchen 13 und 15, dadurch gekennzeichnet, daß, nachdem die Bildung der ersten Windung einer neuen Lage detektiert wurde, eine schnelle Bewegung der Trommel (8) bezüglich der Kabelführung (17) bewirkt wird, so daß der Winkel (α), mit dem das Kabel (C) der Trommel (8) zugeführt wird, einen vorbestimmten Wert mit entgegengesetztem Vorzeichen zu seinem vorigen Wert annimmt.

Revendications

1. Système de commande d'une machine pour l'enroulement de câbles électriques (C) et similaires, comprenant

- des moyens de support (1, 5) destinés à recevoir et à supporter de manière tournante un touret (8) comprenant des flasques d'extrémité (8a, 8b),

- un guide-câble (17),

- des premiers moyens d'entraînement (15) pour faire tourner le touret (8),

- des deuxièmes moyens d'entraînement (14) pour provoquer un mouvement relatif entre le guide-câble (17) et le touret (8), parallèlement à l'axe de rotation du touret (8), en fonctionnement ;

   le système de commande comprenant :

- des moyens de détection (16) destinés à surveiller la vitesse de rotation du touret (8),

- une source de rayonnement laser (20) destinée à éclairer le touret (8) depuis un flasque d'extrémité vers l'autre (8a, 8b) de manière à projeter une ligne de lumière (L) sur les spires enroulées autour du touret (8),

- au moins une caméra de télévision (21) qui est fixée sur le guide-câble (17) et peut cadrer la partie du touret (8) qui est éclairée par la source (20), et

- un système de commande et de traitement (30, 31) qui est raccordé aux moyens de détection (16), pour surveiller la vitesse de rotation du touret (8), et à la caméra de télévision (21), et qui comprend des moyens de traitement des signaux-image (30), qui sont agencés pour analyser les signaux fournis par ladite au moins une caméra de télévision (21), le système de commande et de traitement (30, 31) étant agencé pour piloter les premiers et deuxièmes moyens d'entraînement (15, 14) d'une manière prédéterminée en fonction des résultats de l'analyse des signaux fournis par ladite au moins une caméra de télévision (21) ;

   le système de commande étant caractérisé en ce que la source (20) est agencée de manière que la ligne de lumière (L) projetée intersecte la partie (C₁) du câble (C) qui se trouve entre le guide-câble (17) et le touret (8), près du point (Q) au niveau duquel le câble (C) est déposé sur le touret (8), et en ce que le système de commande et de traitement (30, 31) est agencé :

- pour déterminer la position d'un point caractéristique (P) de l'intersection de la ligne de lumière (L) avec la partie (C1) du câble (C), par rapport à un premier axe de référence (x) parallèle à l'axe du touret (8) et fixé sur le guide-câble (17) ;

- pour calculer la vitesse (V_p) du déplacement du point caractéristique (P) par rapport à l'axe (x) ;

- pour commander les deuxièmes moyens d'entraînement (14) de manière à provoquer un mouvement relatif entre le guide-câble (17) et le touret (8), à une vitesse nominale (V₀) qui dépend du diamètre (D) du câble (C) et qui est proportionnelle à la vitesse de rotation (Ω) du touret (8), lorsque le point caractéristique (P) reste dans une position de référence constante et prédéterminée (x₀) par rapport à l'axe (x) et que sa vitesse (V_p) est sensiblement nulle.

2. Système de commande selon la revendication 1, caractérisé en ce que le système de commande et de traitement (30, 31) est également agencé pour provoquer une variation de la vitesse relative (V_RT) entre le guide-câble (17) et le touret (8), lorsque la vitesse (V_p) du point caractéristique (P) par rapport à l'axe (x) dépasse un seuil prédéterminé (Δv), la variation étant de signe opposé à la vitesse (V_p) du point caractéristique (P) et étant provoquée aussi longtemps que la vitesse (V_p) du point caractéristique (P) est sensiblement égale en amplitude à la variation imposée à la vitesse relative (V_RT) entre le guide-câble (17) et le touret (8), et ensuite pour ramener la vitesse relative (V_RT) entre le guide-câble (17) et le touret (8) rapidement à la valeur nominale (V₀) et après pour provoquer une translation relative rapide entre le guide-câble (17) et le touret (8), de manière à ramener le point caractéristique (P) dans la position de référence (X₀) par rapport à l'axe (x).

3. Système de commande selon la revendication 2, caractérisé en ce que le système de commande et de traitement (30, 31) est agencé pour comparer la position instantanée (x_p) du point caractéristique (P) avec une position de référence constante différente (x₀) pour chaque couche de spires enroulées autour du touret (8).

4. Système de commande selon la revendication 3, caractérisé en ce que le système de commande et de traitement (30, 31) est agencé pour comparer la position instantanée (x_p) du point caractéristique (P) avec une position de référence constante (x₀), qui est tabulée et mémorisée pour chaque couche selon les caractéristiques du câble (C), notamment son diamètre (D).

5. Système de commande selon l'une quelconque des revendications qui précèdent, caractérisé en ce que le système de commande et de traitement (30, 31) est également agencé

- pour déterminer la coordonnée (Y_p) du point caractéristique (P) par rapport à un deuxième axe de référence (y) perpendiculaire au premier (x), et

- pour détecter la formation de la première spire d'une nouvelle couche de spires, sur la base de l'observation des variations des coordonnées du point caractéristique (P) par rapport aux premier et deuxième axes (x, y).

6. Système de commande selon les revendications 3 et 5, caractérisé en ce que le système de commande et de traitement (30, 31) est agencé pour déterminer les coordonnées, par rapport au deuxième axe de référence (y), de points caractéristiques homologues des intersections de la ligne de lumière (L) avec les spires de la couche d'enroulement qui est en cours de dépôt et pour calculer le diamètre de la couche sur la base des coordonnées.

7. Système de commande selon l'une quelconque des revendications qui précèdent, caractérisé en ce que le système de commande et de traitement (30, 31) est également agencé

- pour déterminer la distance entre le point caractéristique (P) et le flasque d'extrémité (8a, 8b) du touret (8) ; et

- pour provoquer une réduction contrôlée de la vitesse relative entre le guide-câble (17) et le touret (8), lorsque la distance entre le point caractéristique (P) et un flasque (8a, 8b) tombe à une valeur prédéterminée, de manière à augmenter l'angle (α) sous lequel le câble (C) est délivré sur le touret (8) jusqu'à ce que le câble (C) soit amené à chevaucher la dernière spire de la couche précédente de manière à former la première spire de la couche suivante.

8. Système de commande selon les revendications 5 et 7, caractérisé en ce que le système de commande et de traitement (30, 31) est également agencé pour provoquer, après avoir détecté la formation de la première spire d'une nouvelle couche, un mouvement relatif, rapide et contrôlé, entre le touret (8) et le guide-câble (17), de manière à amener l'angle (α) sous lequel le câble (C) est délivré sur le touret (8) à prendre une valeur prédéterminée de signe opposé à sa valeur antérieure.

9. Procédé pour former un enroulement régulier d'un câble électrique (C), ou similaire, sur un touret (8), dans une machine d'enroulement (1) qui comprend des moyens de support (1), destinés à recevoir et à supporter de manière tournante un touret (8) muni de flasques d'extrémité (8a, 8b) et qui comporte des moyens d'entraînement (14, 15) pour faire tourner le touret (8) et lui conférer un mouvement de translation par rapport à un guide-câble (17), parallèlement à l'axe de rotation du touret (8) ;
   le procédé comprenant les étapes consistant à :

- projeter une ligne de lumière (L) depuis un flasque d'extrémité (8a) du touret (8) vers l'autre (8b) de telle manière que la ligne de lumière (L) s'étende au-dessus des spires enroulées sur le touret (8),

- cadrer la partie du touret (8) sur laquelle la ligne de lumière (L) s'étend, avec au moins une caméra de télévision (21), fixée sur le guide-câble (17), de manière à générer des signaux-image correspondants,

- traiter et analyser les signaux-image,

- piloter les moyens d'entraînement (14, 15) d'une manière prédéterminée en fonction des résultats de l'analyse des signaux-image ;

   le procédé étant caractérisé en ce que la ligne de lumière (L) est projetée d'une manière telle qu'elle intersecte la partie (C1) du câble (C) qui s'étend entre le guide-câble (17) et le touret (8), près du point (Q) au niveau duquel le câble (C) est déposé sur le touret (8), et en ce qu'il comprend également les étapes consistant à :

- déterminer la position d'un point caractéristique (P) de l'intersection de la ligne de lumière (L) avec la partie (C1) du câble (C), par rapport à un premier axe de référence (x) parallèle à l'axe du touret (8) et fixé sur le guide-câble (17) ;

- calculer la vitesse du déplacement (V_p) du point caractéristique (P) par rapport à l'axe (x) ;

- commander les deuxièmes moyens d'entraînement (14) de manière à provoquer un mouvement relatif entre le guide-câble (17) et le touret (8), à une vitesse nominale (V₀) qui dépend du diamètre (D) du câble (C), et qui est proportionnelle à la vitesse de rotation (Ω) du touret (8), lorsque le point caractéristique (P) reste dans une position de référence constante et prédéterminée (x₀) par rapport à l'axe (x) et que sa vitesse (V_p) est sensiblement nulle.

10. Procédé selon la revendication 9, caractérisé également par les étapes consistant à

- provoquer une variation de la vitesse relative (V_RT) entre le guide-câble (17) et le touret (8), lorsque la vitesse (V_p) du point caractéristique (P) par rapport à l'axe (x) dépasse un seuil prédéterminé (Δv), la variation étant de signe opposé à la vitesse (V_p) du point caractéristique (P) et étant provoquée aussi longtemps que la vitesse (V_p) du point caractéristique (P) est sensiblement égale en amplitude à la variation imposée à la vitesse relative (V_RT) entre le guide-câble (17) et le touret (8), et ensuite à ramener rapidement la vitesse relative (V_RT) à la valeur nominale (V₀) et après à provoquer une translation relative rapide entre le guide-câble (17) et le touret (8), de manière à ramener le point caractéristique (P) dans la position de référence (X₀) par rapport à l'axe (x).

11. Procédé selon la revendication 10, caractérisé en ce que la position instantanée (x_p) du point caractéristique (P) est comparée à une position de référence constante différente (x₀) pour chaque couche de spires enroulées sur le touret (8).

12. Procédé selon la revendication 11, caractérisé en ce que la position de référence (x₀) du point caractéristique (P) est tabulée et mémorisée pour chaque couche selon les caractéristiques du câble (C), notamment son diamètre (D).

13. Procédé selon l'une des revendications 9 à 12, caractérisé en ce que la coordonnée (Y_p) du point caractéristique (P) par rapport à un deuxième axe de référence (y) perpendiculaire au premier (x) est détectée, et en ce que la formation de la première spire d'une nouvelle couche d'enroulement est détectée sur la base de l'observation des coordonnées (X_p, y_p) du point caractéristique (P).

14. Procédé selon les revendications 11 et 12, dans lequel les coordonnées, par rapport au deuxième axe de référence (y), de points caractéristiques homologues de l'intersection de la ligne de lumière (L) avec les spires de la couche d'enroulement qui est en cours de dépôt, sont déterminées et le diamètre de la couche est calculé sur la base de ces coordonnées.

15. Procédé selon l'une des revendications 9 à 14, dans lequel la distance entre le point caractéristique (P) et les flasques d'extrémité (8a, 8b) du touret (8) est déterminée, et dans lequel une réduction contrôlée de la vitesse relative du touret (8) par rapport au guide-câble (17) est provoquée, lorsque la distance entre le point caractéristique (P) et un flasque tombe à une valeur prédéterminée, de manière à augmenter l'angle (α) sous lequel le câble (C) est délivré sur le touret (8), jusqu'à ce que le câble (C) soit amené à chevaucher la dernière spire de la couche précédente de manière à former la première spire de la couche suivante.

16. Procédé selon les revendications 13 et 15, caractérisé en ce que, après que la formation de la première spire d'une nouvelle couche a été détectée, un déplacement rapide du touret (8) par rapport au guide-câble (17) est provoqué, de manière à amener l'angle (α) sous lequel le câble (C) est délivré sur le touret (8) à prendre une valeur prédéterminée de signe opposé à sa valeur précédente.

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