Method and device for traversing of yarn on textile machines

Description

Technical field

[0001] A method for traversing of a yarn upon its winding on a bobbin mounted in a winding mechanism of an operating unit of a textile machine, at which traversing motion of the yarn is generated through a straight-line reciprocating motion of a traversing rod being common for a row of operating units, whereas before the dead centre of the traversing rod its kinetic energy is transformed to potential energy, which contributes to deceleration in motion of the traversing rod, behind the dead centre the potential energy of the traversing rod changes to kinetic energy, which contributes to acceleration in motion of the traversing rod.

[0002] A textile machine with a device for traversing of a yarn being wound on a winding bobbin mounted in a winding mechanism of an operating unit of the textile machine, comprising along the machine arranged a traversing rod being common for a row of operating units of one side of the machine coupled with a drive imparting it a straight-line reciprocating motion of a variable stroke and at least two magnetic couples formed of identical poles of magnets arranged one against another on a machine frame and on the traversing rod.

Background art

[0003] Winding of cylindric or taper cross-wound bobbins on textile machines with a row of side by side arranged operating units, for example on open-end spinning machines, winding machines or two-for-one twisters is commonly performed by means of a continuous traversing rod passing along one side of operating units of the machine. The bobbins being wound during winding roll by their surface being wound on a cylindrical surface of the driving roller, while their rotation axis is parallel with an axis of the traversing rod and the traversing rod upon winding of the bobbin performs a straight-line reciprocating motion. The stroke of the traversing rod corresponds to the length of a surface line of the package of the bobbin being wound.

[0004] Owing to a machine productivity the speed of the yarn being delivered to the bobbin being wound is high, which requires also a high frequency of straight-line reciprocating motion of the traversing rod. At the same time at a high number in a row arranged operating units the traversing rod has e.g. a length of 30 metres, thus having a considerable weight.

[0005] Big inertial mass of the traversing rod causes problems in dead centres of its straight-line reciprocating motion. Yarn is deposited on a surface of the bobbin in a screwline with length of lay, that forms the desired cheese package. In a dead centre of motion of the traversing rod, this is on a face of the bobbin being wound, due to slowing of the rod before its subsequent acceleration, length of lay of the screwline decreases to zero. To preclude accumulation of yarn, in the area of dead centres it is necessary to modify motion of the traversing rod. Upon a constant stroke both dead centres may be displaced simultaneously in one and second direction, or it is possible to alternatively increase or decrease the size of stroke through displacing the positions of dead centres mutually in opposite sense.

[0006] When the rod moves in a constant speed, the required power of its driving mechanism is relatively small, as it serves solely to overcome the passive resistance and to deflect the yarn. In dead centres there occur substantial changes in power of the driving mechanism, first before the dead centre it is necessary to withdraw the inertial energy of the traversing rod, and subsequently behind the dead centre inertial energy must be imparted to the traversing rod for its acceleration. This is solved by a great nominal driving moment of the motor and/or by accumulation of kinetic energy induced at braking of inertia mass of the traversing rod before the dead centre and repeated releasing of accumulated energy at starting run of the traversing rod behind the dead centre. Energy of the traversing rod is usually accumulated into rotation energy of the driving mechanism, nevertheless if a driving mechanism is used where a servomotor exercises a reverse motion, on the contrary inertia mass or moment of the driving mechanism must also be braked and after then sped-up, and the driving moment or power of the servomotor must be high. Servomotors with high driving moment have a great inertia moment, what increases the total reduced moving mass, so that attainable increase in acceleration of the traversing rod is small or none.

[0007] Next to securing the required shape of the borders of package on bobbin, another problem is increasing of diameter of the bobbin being wound, at which is gradually changed the axial position of individual consecutive laid threads of yarn, which near and draw apart alternatively. By this the zones are formed periodically, that disturb the shape of the package and complicate the course of winding. This is prevented so that the motion of the traversing rod is gradually changed according to a certain regulation. The driving mechanism of the traversing rod is usually coupled with one of its ends. A long traversing rod is thus sensitive to formation of vibrations. Along this rod not only longitudinal waves of deformation are expanded, but also the traverse waves caused by that the rod is subject to buckling upon existence of play in guide bearings. Moreover yawing results in increasing of friction forces. The traverse waves on the rod have a lower speed than the longitudinal waves and oscillation of the rod is usually very complicated. Motion of a free end of traversing rod after then differs from motion of rod section in the place of its connection with the driving mechanism.

[0008] Reduction of inertia forces created upon reciprocating motion of the traversing rod in principle cannot be positively affected by decreasing its weight. Through this, the strength of the rod is usually reduced, again this results in undesired deformations.

[0009] The device according to CZ 1997-2323 A3 derives motion of the traversing rod through a cam mechanism. To reduce straining and wear of this mechanism and to enable speed increase of yarn winding, before the centre of motion of the traversing rod there are positioned springs, which absorb its dynamic forces and they speed it up retroactively. The position of the springs with respect to the machine frame is a constant one, or it can be displaced according to displacement of the outer dead centres of the traversing rod upon overlapping of edges on the bobbin.

[0010] At mechanical or pneumatic springs it is nevertheless difficult to ensure their non-linear characteristics, which would meet requirements resulting from operational dynamics. Additional utilisation of rubber or plastic bumpers acting on the traversing rod in vicinity of dead centres causes impulses and vibration of the rod, moreover service life of these elements is low. Due to loading, the service life of springs themselves is also low. The solution according to CZ 300588 B6 proposes to connect to the traversing rod rotationally an end of a drawbar, whose second end is rotationally connected with a rotationally mounted main crank. This crank creates an output means of a rotational electronically controlled drive coupled with a driving mechanism. The main crank together with the electronically controlled drive is connected with a frame of the textile machine through a displaceable coupling to ensure overlapping of the yarn package in dead centres, so called blurring.

[0011] Angular speed of the main crank is continuously decreased or increased by means of the rotational electronically controlled drive controlled with a controlling mechanism upon motion of the traversing element from one dead centre to the second dead centre. This happens in linear relation on the required magnitude of angle of yarn crossing on the bobbin being wound and/or in linear relation on position of the traversing element, through which the required angle of yarn crossing on the bobbin being wound and/or the required course for speed of motion of the traversing element is achieved.

[0012] Function of such a device may satisfactorily meet requirements for a quality arrangement of package, at the same time it may also contribute to solving problems of inertia forces generated by a reciprocating motion of the traversing rod. Shortcoming of such control means is their complexity thus also the price, at the same time such complexity brings increase of failure rate.

[0013] CZ 2007-214 A3 utilises two couples of magnets positioned by identical poles against each other, out of which always one is mounted adjustably on a machine frame, the second in a fixed manner on a traversing rod, while they are mutually adjacent with the same poles. This solution brings an efficient damping of straight-line reciprocating motion of the traversing rod in area of dead centres, while energy of inertia mass of the rod in time before the dead centre is accumulated and then this energy is consumed which contributes to starting run of the traversing rod behind dead centre. The goal of bumper is to stop motion of the magnet on a short track and to prevent damage of magnets during undesired hard bottoming of magnets on each other.

[0014] Through displacement of the magnets mounted on the frame there can be achieved adaptation to changes in positions of dead centres of the traversing rod. It is especially advantageous if the position of the magnets mounted on a frame is controlled by means of servomotors.

[0015] The shortcoming of this solution is a rapid increase of mutual force of approaching magnets and from it resulting poor possibility to set exactly the position of dead centre resulting from the force characteristics of magnets. During deformation of the bumper there act not only elastic forces given by the bumper, but simultaneously also high increase of detachment forces of the magnets given by steep characteristics of action of forces of the magnetic field.

[0016] The goal of the invention is to remove or at least substantially reduce shortcomings of the background art and to bring good possibilities when setting position of dead centres of a traversing rod, at the same time to achieve a high level of accumulation of energy of the traversing rod being stopped and its backward expenditure.

Principle of the invention

[0017] The goal of the invention has been achieved by a method for traversing of yarn upon its winding on a bobbin mounted in a winding mechanism of an operating unit of a textile machine, whose principle consists in that, before dead centre of the traversing rod in the first phase of its deceleration kinetic energy of the traversing rod transforms to potential energy of a magnetic field, and in the second phase of deceleration to potential energy of a field of elastic forces, which contributes to deceleration in motion of the traversing rod, whereas, subsequently behind the dead centre of the traversing rod in the first phase of acceleration of the traversing rod the potential energy of the field of elastic forces transforms to kinetic energy of the traversing rod, and in the second phase of its acceleration the potential energy of the magnetic field transforms to kinetic energy of the traversing rod, which contributes to acceleration in motion of the traversing rod. At least in the final area of the first phase of deceleration before dead centre to the traversing rod there acts a force, which with respect to the track of motion of the traversing rod is increasing more steeper than in the second phase of deceleration. Similarly it is during acceleration after change in direction of motion of the traversing rod after the dead centre, when in the second phase of acceleration to the traversing rod there acts a force which with respect to the track of motion of the traversing rod is increasing more steeper than in the first phase of acceleration.

[0018] Owing to a flat characteristics of a field of elastic forces in the second phase of deceleration of the traversing rod, the differences of elastic forces during blurring cycle can be minimised. In comparison with accumulation only by springs an advantage of the invention is in that it is without beats. On the contrary, in comparison with accumulation only with magnets the advantage is a flat characteristics in the second phase of deceleration, which secures a minimum change in force during the blurring cycle, this without necessity of an additional controlled motion of stationary magnet towards the machine frame as it is in CZ-2007-214 A3.

[0019] The goal of the invention has also been achieved by a textile machine with a device for yarn traversing being wound on a winding bobbin mounted in a winding mechanism of an operating unit of the textile machine, whose principle consists in that, magnetic couples are formed of at least one moving magnet mounted on the traversing rod and two stationary magnets, which are on the machine frame mounted by means of at least one elastically deformable means in a prestressed status, while prestress of elastically deformable means is lower than mutual detachment force of magnetic couple at mutual contact of their identical poles. Owing to a flat characteristics of the field of elastic forces, the steep increase of mutual detachment force of the magnetic couple closely before achieving dead centre of the traversing rod is substantially reduced, which enables to minimise the differences of elastic forces during the blurring cycle and facilitates adjustment of the machine and reduces beats caused by regular stopping the substantive traversing rod. An important advantage is that at this manner of accumulation there is no sharp increase in mutual force at approaching of moving and stationary magnets, thus no beats are generated during accumulation of energy and its backward expenditure.

[0020] The device comprises two stationary magnets, out of which each is coupled with one independent elastically deformable means. Each of stationary magnets is mounted in an independent bushing, while between it and bottom of the bushing there is inserted elastically deformable means, preferably a compression spiral spring. The device is relatively cheap, easily adjustable.

[0021] It is also suitable if the device comprises two stationary magnets coupled with one common elastically deformable means.

[0022] Preferably the magnets are mounted displaceably in cavity of a common bushing in a fixed manner connected with the machine frame and arranged axially with the traversing rod, while the elastically deformable means is arranged between the stationary magnets, while the moving magnets are attached to the traversing rod outside the bushing so that the bushing is to be found between the moving magnets, at the same time the difference in distance of mutually adjacent faces of moving magnets and the distance of mutually averted faces of stationary magnets in a prestressed status of an elastically deformable means equals to a basic stroke of the traversing rod which is lower than a real stroke of the traversing rod.

[0023] Prefered is also the device whose each stationary magnet is mounted displaceably in cavity of one of two independent bushings in a fixed manner connected with machine frame and arranged axially with the traversing rod, while the elastically deformable means is always arranged between the bushing bottom and the stationary magnet, while the moving magnets or moving magnet is attached on the traversing rod in area between the bushings, at the same time the difference in distance of mutually adjacent faces of the stationary magnets in a prestressed status of the elastically deformable means and the distance of mutually averted faces of the moving magnets or faces of the moving magnet equals to a basic stroke of the traversing rod which is lower than a real stroke of the traversing rod.

[0024] In this manner it is possible to place along the traversing rod even more couples of magnets and to adjust design to a structure of the machine, especially with respect to potential as regards the space.

[0025] From this point of view it is advantageous, if the bushing on the machine frame is attached between two neighbouring operating units of the machine.

[0026] Preferably, the moving magnets on the traversing rod are attached so that they can be re-adjusted. This enables to modify length of packages.

[0027] As regards the magnets themselves, it is advantageous if the magnets are arranged symmetrically to the longitudinal axis of the traversing rod which enables to create them as rings, with whose face side a mating surfaces of elastically deformable means are in contact.

[0028] The elastically deformable means is formed of the spring, preferably of a compression spiral spring. This is an affordable part, it can be easily adjusted and may be produced in narrow production tolerances from the point of view of their force characteristics.

Description of the drawings

[0029] Exemplary embodiments of the device according to the invention are schematically represented in drawings, where shows Fig. 1 a view to a part of means of a couple of mutually neighbouring operating units of textile machine in embodiment with one spring, Fig. 2 a detail of mutual position of the traversing rod with guide of yarn being wound, magnets and spring in area of dead centre of reciprocating motion of the traversing rod, Fig. 3 dependence of a course of detachment force of the magnets and force of the compression spring before attaining the dead centre of reciprocating motion of the traversing rod, Fig. 4. view to a section of means of a couple of mutually neighbouring operating units of the textile machine in embodiment with two springs and Fig. 5 detail of mutual position of the traversing rod with guide of yarn being wound, magnets and spring in area of dead centre of reciprocating motion of the traversing rod for embodiment with two springs.

Examples of embodiment

[0030] Exemplary embodiment of a device according to the invention is represented in Fig. 1, on which there are two neighbouring operating units of a spinning frame. In a frame 1 of a machine along a row of operating units arranged in sections having a certain number of places there is arranged a continuous traversing rod 2 mounted slidably in a slide-way 11 and connected to a known not represented driving mechanism, through which it is brought into a controlled straight-line reciprocating motion and through which the position of dead centers of the traversing rod 2 is controlled. To the traversing rod 2 for each operating unit in a fixed manner is attached in detail not represented a traverse guide 21 of yarn (for operating unit represented on the LH side), 22 (for operating unit represented on the RH side) of yarn 3 being wound. Between a certain couple of operating units of one section to the frame 1 of the machine co-axially to the traversing rod 2 a cylindrical bushing 4 is attached, in detail represented in the Fig. 2. The continuous traversing rod 2 thus passes through the bushing 4. Two cylindrical guidance 43 are slidably mounted in an inner cylindric cavity of the bushing 4 between its collars 41, 42, in whose cavity a compression spiral spring 44 is mounted. The collar 42 to the body of bushing 4 is attached in a dismountable manner e.g. by means of a screw 45. This enables to insert the guidance 43 and the spring 44 into a body of the bushing 4. In external face recesses 431 of the guidance 43 are attached ring permanent stationary magnets 5, 6, which are mutually adjacent e.g. with opposite poles. The inner diameter of the ring stationary magnets 5, 6 is greater than the outer diameter of the traversing rod 2. It is obvious that the elastically deformable means need not to be only the compression spiral spring 44. It can be of course superseded by another elastically deformable means, e.g. other type of metal spring, possibly a pneumatic spring.

[0031] On the traversing rod 2 at operating units neighbouring with the bushing 4 in a place of the guides 21, 22 of the yarn 3 there are attached the moving magnets 210, 220 so that they are to the neighbouring stationary magnet 5, 6 adjacent with the identical pole.

[0032] Mutual arrangement of the magnets 5, 210, and 6, 220 is such that the difference of distance vp₁ of mutually adjacent faces of the moving magnets 210, 220 and distance vo₁ of mutually averted faces of the stationary magnets 5, 6 is a length of basic stroke of the traversing rod 2, at which the spring 44 is permanently constantly prestressed without compression in area of dead centers of the traversing rod 2. Real stroke of the traversing rod 2 is greater than the basic stroke. The difference of the real stroke and of the basic stroke equals to a maximum on machine adjustable stroke of blurring of edges in package. Upon motion of the traversing rod this difference in lengths causes compression of the spring 44 in dead centers of motion of the traversing rod. Compression rate of the spring 44 is variable and corresponds to actual dead centre during blurring cycle. In a not represented embodiment the moving magnets 210, 220 with respect to the traversing rod 2 may be attached displaceably. This is at a greater number of units according to the invention arranged along one traversing rod 2 less advantageous from the point of view of machine adjustment, but it enables to change the length of the basic stroke of the traversing rod 2 at the same time preserving a size and course of detachment forces before the dead centers of the traversing rod 2.

[0033] In the frame 1 of the machine along a row of operating units there is arranged a continuous driving shaft 7 of an winding mechanism mounted rotatably in bearings 12 and connected to a known not represented drive. In each operating unit on the driving shaft 7 a driving roller 71 is attached, with whose friction circumference a surface of a bobbin 72 being wound is in contact during yarn 3 winding. In case the bobbin 72 being wound has a cylindrical shape, its rotation axis is parallel with rotation axis of the driving shaft 7.

[0034] The shown exemplary embodiment does not specify number of bushings for a whole one side of the spinning machine. The bushing 4 with the stationary magnets 5, 6 and to it corresponding couple of the moving magnets 210, 220 need not to be arranged in each section of the operating units, or vice versa there can be a greater number of them than it corresponds to number of sections. Preferably for installation of the bushing 4 a space may be utilised, that is usually available between the neighbouring sections of the machine. This enables an additional installation of the device according to the invention on spinning machines being already in operation. It is obvious that in cases when a greater number of the bushings 4 positioned on one traversing rod 2 is utilised, some bushing 4 may be positioned at an end of the traversing rod 2. In principle, during positioning the bushings along the traversing rod 2 always the goal is to prevent oscillation of the traversing rod 2. Fig. 3 represents dependence of a course of detachment force F of the magnets 5 and 210, and a force of the compression spring 44 on position x of the traversing rod 2 in area of dead centre of its straight-line reciprocating motion. This position is given by setting of a regulation mechanism which in a known manner controls a change in position of the dead centers of the traversing rod 2 upon winding the yarn 3, through which overlapping of package in dead centres i.e. blurring is achieved. In idle mode of the device the spring 44 is mounted in the bushing 4 with prestress F₁. Beginning of coordinate system (x_o, F_o) here characterises a moment, in which a mutual detachment force of the stationary magnets 5 and to it approaching moving magnet 210 upon motion of the traversing rod 2 in direction to the right (Fig. 2 and 3) begins to be active. In this moment the traversing rod 2 is in a distance corresponding to track d₀₂ = d₀₁ + d₁₂ before the dead centre. In the following first phase of motion of the traversing rod 2 the detachment force F of mutually repelling magnets 5, 210 grows progresively, and after making the track d₀₁, this is in position x₁, it achieves a value of prestress F₁ of the spring 44. The spring 44 has a flat linear characteristics, the magnets 5, 210 do not practically approach mutually, but owing to the weak spring 44 in the second phase of motion of the traversing rod 2 on the LH side situated guidance 43 upon compression of the spring 44 is being displaced with respect to the body of of the bushing 4 to the right. Detachment force increases on the track d₁₂, from the value F₁ in position x₁ to value F₂ in position x₂ in linear manner and gradually. The distance d_m between the magnets at prestress F₁ is given by equilibrium of forces between the magnet and the magnet with spring. During compression of the spring the force increases only at minimum and so the resultant gap d_m between the magnets also decreases slightly, it does not change practically.

[0035] Fig. 4 and detailed Fig. 5 represent an alternative embodiment of the device according to the invention, which comprises two bushings 8 attached to the frame 1 of the machine axially with the traversing rod 2 and mutually in a mirror view to the left and to the right in neighbourhood of the traverse guide 21 of the yarn 3 of the operating unit represented on the LH side. The bushings 8 on mutually averted sides have fixed faces 81 and on mutually adjacent sides they have collars 82. In the bushings 8 from the side of the collar 82 always is slidably mounted a cylindrical guidance 83, in whose cavity the compression spiral spring 84 is mounted, whose second side leans against the fixed face 81 of the bushing 8. The collar 82 to a body of the bushing 8 is attached in a dismountable manner e.g. by means of a screw 85. This enables to insert the guidance 83 and the spring 84 into the body of the bushing 8. In an external face recesses 831 of the guidance 83 of the first and the second bushing 8 are attached the ring permanent stationary magnets 5, 6. Inner diameter of the ring stationary magnets 5, 6 is greater than outer diameter of the traversing rod 2.

[0036] To the traversing rod 2 in area of the traverse guide 21 in exemplary embodiment there is attached a longer ring moving magnet 200, represented schematically under axis of the traversing rod 2. In alternative embodiment represented above axis of the traversing rod 2, on the traversing rod 2 are attached two ring moving magnets 210, 220. The moving magnet 200, or the moving magnets 210, 220 to the respective stationary magnets 5, 6 are adjacent by the identical poles, through which practically create cooperating couples of mutually repelling magnets, similarly as it is at embodiment represented in Fig. 1.

[0037] Mutual arrangement of magnets 5, 6, 200 (possibly 210, 220) is such, that a difference in distance vp₂ of mutually adjacent faces of stationary magnets 5, 6 and a distance vo₂ of averted faces of the moving magnet 220 (possibly of mutually averted faces of the moving magnets 210, 220) represents length of the basic stroke of the traversing rod 2, at which the springs 84 are permanently constantly prestressed without compression in area of the dead centres of the traversing rod 2. The real stroke of the traversing rod 2 is greater than the basic stroke. The difference of the real stroke and of the basic stroke equals to the maximum on the machine adjustable stroke of blurring of the edges in package. Upon motion of the traversing rod this difference in lengths causes compression of the spring 84 in the dead centers of motion of the traversing rod. Compression rate of the spring 84 is variable and corresponds to actual dead centre during the blurring cycle. In a not represented embodiment the moving magnets 210, 220 with respect to the traversing rod 2 may be attached displaceably analogically with the above mentioned embodiment from Fig. 1.

[0038] Next to utilisation of transformation of kinetic energy of the traversing rod 2 to potential energy of magnetic field and potential energy of field of elastic forces of the compressed spring 44, 84) for braking of the traversing rod 2 before the dead centre and vice versa utilisation of transformation of accumulated potential energy of the field of elastic forces and potential energy of the magnetic field for its starting run behind the dead centre, the principle advantage of the solution according to this invention is ability of accumulation of energy without impulses and flat characteristics of the spring 44, 84 in the last section of track of the traversing rod 2. The traversing rod 2 in the moment (F₁, x₁) of compression beginning of the spring 44, 84 disposes of a relatively low speed. The size and course of detachment forces of the magnets 5, 210 in combination with the flat characteristics of the spring 44, 84 enable to achieve a high degree of energy accumulation on the short track d₀₂ before the dead centre of the traversing rod 2, with low difference of final forces F₁, F₂ at variable track d₀₂ in stroke of the traversing rod 2.

[0039] Positioning of accumulators along the whole traversing rod enables to eliminate impact of longitudinal oscillation of the traversing rod, thus enables to achieve highly accurate positions in the dead centers of guides attached to the traversing rod 2 and the ideal blurring, thus the quality of package being formed. Moreover, the device according to the invention is simple in its structure. This fact enables to install them on more places along the traversing rod 2. The exemplary embodiments are cited with the goal to explain perfectly the method and the device according to the invention, at the same time their meaning is not a limiting one.

List of referential markings

[0040] 

1

frame of the machine

11

slide-way (of traversing rod)

12

bearing of driving shaft (of winding mechanism)

2

traversing rod

21

traverse guide (of yarn being wound, on LH side)

210

moving magnet (on LH side)

22

traverse guide (of yarn being wound, on RH side)

220

moving magnet (on RH side)

3

yarn

4

bushing

41

collar (of bushing on LH side)

42

collar (of bushing on RH side)

43

cylindrical guidance (of pring)

431

recess (in face of bushing)

44

spring (compression, spiral)

45

screw

5

stationary magnet (on LH side)

6

stationary magnet (on RH side)

7

driving shaft (of winding mechanism)

71

driving roller (of winding mechanism)

72

bobbin being wound

8

bushing

81

face (of bushing)

82

collar (of bushing)

83

guidance (of spring)

84

spring (compression, spiral)

85

screw

F

force (action of magnetic field of spring)

F_o

force (in beginning of coordinate axis = 0)

F₁

force (prestress of spring, maximum from magnetic field)

F₂

force (maximum from sum of magnetic field and spring elasticity)

d₀₁

track of traversing rod (in first phase of decelerated motion before dead centre or in second phase of accelerated motion behind dead centre)

d₀₂

total track of traversing rod (of decelerated motion before dead centre or of accelerated motion behind dead centre)

d₁₂

track of traversing rod (in second phase of decelerated motion before dead centre or in first phase of accelerated motion behind dead centre)

vo₁

distance of mutually averted faces of stationary magnets

vo₂

distance of mutually averted faces of moving magnets, (of moving magnet)

vp₁

distance of mutually adjacent faces of moving magnets

vp₂

distance of mutually adjacent faces of stationary magnets

x

position of traversing rod

x_o

beginning of coordinate axis

x₁

position of traversing rod (at the end of independent action of magnetic field)

x₂

position of traversing rod in dead centre

Claims

1. A method for traversing of a yarn (3) upon its winding on a bobbin (72) mounted in a winding mechanism of an operating unit of a textile machine, at which traversing motion of the yarn (3) is generated through a straight-line reciprocating motion of a traversing rod (2) being common for a row of operating units, whereas before the dead centre of the traversing rod (2) in the first phase of its deceleration kinetic energy of the traversing rod (2) transforms to potential energy of a magnetic field, and in the second phase of deceleration kinetic energy of the traversing rod (2) transforms to potential energy of a field of elastic forces, which contributes to deceleration in motion of the traversing rod (2), whereas subsequently behind the dead centre in the first phase of acceleration of the traversing rod (2) potential energy of the field of elastic forces transforms to kinetic energy of the traversing rod (2), and in the second phase of acceleration of the traversing rod (2) potential energy of the magnetic field transforms to kinetic energy of the traversing rod (2), which contributes to acceleration in motion of the traversing rod (2), characterised in that before the dead centre, at least in a final area of the first phase of deceleration of the traversing rod (2) there acts to the traversing rod (2) a force, which with respect to the track of motion of the traversing rod (2) is increasing more steeper than in the second phase of deceleration, wherein the field of elastic forces has a flat characteristics, such that the differences of elastic forces during a blurring cycle are minimized.

2. A textile machine with a device for traversing of a yarn (3) being wound on a winding bobbin (72) mounted in a winding mechanism of an operating unit of the textile machine, comprising along the machine arranged a traversing rod (2) being common for a row of operating units of one side of the machine coupled with a drive imparting it a straight-line reciprocating motion of a variable stroke, and at least two magnetic couples formed of identical poles of magnets arranged one against another on a machine frame (1) and on the traversing rod (2), characterised in that the magnetic couples are formed of at least one moving magnet (210, 220) mounted on the traversing rod (2) and two stationary magnets (5, 6), which on the machine frame are mounted by means of at least one elastically deformable means in a prestressed status, while a force (F₁) of prestress of the elastically deformable means is lower than a mutual detachment force of the magnetic couple at mutual contact of their identical poles, wherein the elastically deformable means has a flat linear characteristics, such that the steep increase of the mutual detachment force of the magnetic couple is closely before achieving the dead centre of the traversing rod substantially reduced and the differences of elastic forces during a blurring cycle are minimized.

3. The textile machine according to the claim 2, characterised in that each of the two stationary magnets (5, 6) is coupled with one independent elastically deformable means.

4. The textile machine according to the claim 2, characterised in that the two stationary magnets (5, 6) are coupled with one common elastically deformable means.

5. The textile machine according to the claim 4, characterised in that the stationary magnets (5, 6) are mounted displaceably in a cavity of a common bushing (4) in a fixed manner connected with the frame (1) of the machine and arranged axially with the traversing rod (2), while the elastically deformable means is arranged between the stationary magnets (5, 6), while moving magnets (210, 220) are attached on the traversing rod (2) outside the bushing (4) so that the bushing (4) is to be found between the moving magnets (210, 220), at the same time a difference in distance (vp₁) of mutually adjacent faces of the moving magnets (210, 220) and a distance (vo₁) of mutually averted faces of the stationary magnets (5, 6) in a prestressed status of the elastically deformable means equals to a basic stroke of the traversing rod (2), which is lower than a real stroke of the traversing rod (2).

6. The textile machine according to the claim 3, characterised in that each stationary magnet (5, 6) is mounted displaceably in a cavity of one of two independent bushings (8) in a fixed manner connected with the machine frame (1) and arranged co-axially with the traversing rod (2), while the elastically deformable means is always arranged between a bottom of the bushing (8) and a stationary magnet (5, 6), while moving magnets (210, 220) or a moving magnet (200) are attached on the traversing rod (2) in an area between the bushings (8), at the same time a difference in distance (vp2) of mutually adjacent faces of the stationary magnets (5, 6) in a prestressed status of the elastically deformable means and a distance (vo2) of mutually averted faces of the moving magnets (210, 220) or faces of the moving magnet (200) equals to a basic stroke of the traversing rod (2), which is lower than a real stroke of the traversing rod (2).

7. The textile machine according to the claim 5 or 6, characterised in that the bushings (4, 8) on the frame (1) of the machine are attached between two neighbouring operating units of the machine.

8. The textile machine according to any of the claims 2 to 5, characterised in that the moving magnets (210, 220) on the traversing rod (2) are attached so that they can be re-adjusted.

9. The textile machine according to any of the claims 2 to 8, characterised in that the magnets (5, 6, 200, 210, 220) are arranged symmetrically towards longitudinal axis of the traversing rod (2).

10. The textile machine according to the claim 9, characterised in that the magnets (5, 6, 200, 210, 220) are created as rings.

11. The textile machine according to any of the claims 2 to 10, characterised in that the elastically deformable means is formed of a spring.

12. The textile machine according to the claim 11, characterised in that the spring is a compression spiral spring (44, 84).

Ansprüche

1. Verfahren zur Changierung des Garns (3) bei seiner Aufwicklung auf eine Spule (72), die in einer Aufwickeleinrichtung einer Arbeitsstelle einer Textilmaschine gelagert ist, bei dem die Changierbewegung des Garns (3) durch eine lineare umkehrbare Bewegung der Changierungsstange (2) hervorgerufen wird, die für eine Reihe der Arbeitsstellen gemeinsam ist, wobei vor dem Totpunkt der Changierungsstange (2) in der ersten Phase von ihrer Verlangsamung kinetische Energie auf Potentialenergie des magnetischen Feldes umgewandelt wird und in der zweiten Phase der Verlangsamung kinetische Energie der Changierungsstange (2) auf Potentialenergie des Feldes der elastischen Kräfte umgewandelt wird, wodurch es zur Verlangsamung der Bewegung der Changierungsstange (2) beigetragen wird, wobei anschließend hinter dem Totpunkt in der ersten Phase der Beschleunigung der Changierungsstange (2) die Potentialenergie des Feldes der elastischen Kräfte auf kinetische Energie der Changierungsstange (2) umgewandelt wird und in der zweiten Phase der Beschleunigung der Changierungsstange (2) die Potentialenergie des magnetischen Feldes auf kinetische Energie der Changierungsstange (2) umgewandelt wird, wodurch es zur Beschleunigung der Bewegung der Changierungsstange (2) beigetragen wird, dadurch gekennzeichnet, dass vor dem Totpunkt der Changierungsstange (2) mindestens in dem Endbereich der ersten Phase der Verlangsamung der Changierungsstange (2) auf die Changierungsstange (2) mit solcher Kraft gewirkt wird, die in Bezug auf die Bewegungsbahn der Changierungsstange (2) steiler als in der zweiten Phase der Verlangsamung ansteigt, wobei das Feld der elastischen Kräfte eine Flächencharakteristik aufweist, also die Unterschiede der elastischen Kräfte werden während des Verunschärfungszyklus minimiert.

2. Textilmaschine mit einer Changiereinrichtung des Garns (3), das auf eine Spule (72) aufgewickelt wird, die in einer Aufwickeleinrichtung einer Arbeitsstelle einer Textilmaschine gelagert ist, die entlang der Maschine angeordnete Changierungsstange (2), die für eine Reihe der Arbeitsstellen einer Maschinenseite gemeinsam ist, die mit dem Antrieb verkoppelt ist, der ihr eine lineare umkehrbare Bewegung eines veränderlichen Hubes erteilt, und mindestens zwei magnetische Paare aufweist, die durch übereinstimmende Pole von Magneten gebildet sind, die auf dem Maschinenrahmen (1) und auf der Changierungsstange (2) gegenüberliegend gelagert sind, dadurch gekennzeichnet, dass die magnetischen Paare mindestens durch einen beweglichen Magnet (210, 220), der auf der Changierungsstange (2) gelagert ist und zwei feste Magnete (5, 6) gebildet sind, die auf dem Maschinenrahmen mittels mindestens eines elastisch verformbaren Mittels in dem vorgespannten Zustand gelagert sind, wobei die Kraft (F₁) der Vorspannung des elastisch verformbaren Mittels niedriger als gegenseitige Abstoßkraft des magnetischen Paares bei dem gegenseitigen Kontakt von ihren übereinstimmenden Polen ist, wobei das elastisch verformbare Mittel eine flache lineare Charakteristik so aufweist, damit es unmittelbar vor dem Erreichen des Totpunktes der Changierungsstange (2) zur wesentlichen Erniedrigung des steilen Anstiegs der gegenseitigen Abstoßkraft des magnetischen Paares kommt und die Unterschiede der elastischen Kräfte während des Verunschärfungszyklus minimiert werden.

3. Textilmaschine nach dem Anspruch 2, dadurch gekennzeichnet, dass jeder der zwei festen Magnete (5, 6) mit einem selbstständigen elastisch verformbaren Mittel verkoppelt ist.

4. Textilmaschine nach dem Anspruch 2, dadurch gekennzeichnet, dass zwei feste Magnete (5, 6) mit einem gemeinsamen elastisch verformbaren Mittel verkoppelt sind.

5. Textilmaschine nach dem Anspruch 4, dadurch gekennzeichnet, dass die festen Magnete (5, 6) in dem Hohlraum der gemeinsamen Buchse (4) verschiebbar gelagert sind, die mit dem Maschinenrahmen (1) fest verbunden ist und mit der Changierungsstange (2) koaxial angeordnet ist, wobei das elastisch verformbare Mittel zwischen festen Magneten (5, 6) angeordnet ist, wobei die beweglichen Magnete (210, 220) auf der Changierungsstange (2) außerhalb der Buchse (4) so befestigt sind, dass die Buchse (4) zwischen den beweglichen Magneten (210, 220) liegt, wobei der Unterschied des Abstandes (vp₁) der aneinander zugewandten Stirnseiten der beweglichen Magnete (210, 220) und des Abstandes (vo₁) der voneinander abgewandten Stirnseiten der festen Magnete (5, 6) in dem vorgespannten Zustand des elastisch verformbaren Mittels dem Grundhub der Changierungsstange (2) gleich ist, der kleiner als der Ist-Hub der Changierungsstange (2) ist.

6. Textilmaschine nach dem Anspruch 3, dadurch gekennzeichnet, dass jeder feste Magnet (5, 6) in dem Hohlraum einer von zwei selbstständigen Buchsen (8) verschiebbar gelagert ist, die mit dem Maschinenrahmen (1) fest verbunden sind und die mit der Changierungsstange (2) koaxial angeordnet sind, wobei das elastisch verformbare Mittel immer zwischen dem Boden der Buchse (8) und dem festen Magnet (5, 6) angeordnet ist, wobei die beweglichen Magnete (210, 220) oder der bewegliche Magnet (200) auf der Changierungsstange (2) im Bereich zwischen den Buchsen (8) befestigt sind, wobei der Unterschied des Abstandes (vp₂) der aneinander zugewandten Stirnseiten der festen Magnete (5, 6) in dem vorgespannten Zustand des elastisch verformbaren Mittels und des Abstandes (vo₂) der voneinander abgewandten Stirnseiten der beweglichen Magnete (210, 220) oder der Stirnseiten des beweglichen Magnetes (200) dem Grundhub der Changierungsstange (2) gleich ist, der kleiner als der Ist-Hub der Changierungsstange (2) ist.

7. Textilmaschine nach dem Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Buchsen (4,8) auf dem Maschinenrahmen (1) zwischen zwei benachbarten Arbeitsstellen der Maschine befestigt sind.

8. Textilmaschine nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass die beweglichen Magnete (210, 220) auf der Changierungsstange (2) verstellbar befestigt sind.

9. Textilmaschine nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass die Magnete (5, 6, 200, 210, 220) symmetrisch zu der Längsachse der Changierungsstange (2) angeordnet sind.

10. Textilmaschine nach dem Anspruch 9, dadurch gekennzeichnet, dass die Magnete (5, 6, 200, 210, 220) als Ringe gebildet sind.

11. Textilmaschine nach einem der Ansprüche 2 bis 10, dadurch gekennzeichnet, dass das elastisch verformbare Mittel durch Feder gebildet ist.

12. Textilmaschine nach dem Anspruch 11, dadurch gekennzeichnet, dass die Feder eine Andruckschraubenfeder (44, 84) ist.

Revendications

1. Procédé pour la distribution du fil (3) lors de son enroulement sur la bobine (72) montée dans le mécanisme d'enroulement de l'unité de travail de la machine textile dans laquelle le mouvement distributionnel du fil (3) est invoqué par le mouvement linéaire inverse de la tige de distribution (2) qui est commun à un certain nombre d'emplois, tandis que avant le point mort de la tige de distribution (2) dans la première phase de sa décélération l'énergie cinétique se change en énergie potentielle du champ magnétique et dans la seconde phase de décélération l'énergie cinétique de la tige de distribution (2) se change en énergie potentielle du champ des forces élastiques ce qui contribue à ralentir le mouvement de la tige de distribution (2), tandis que après le point mort dans la première phase de l'accélération de la tige de distribution (2) l'énergie potentielle du champ des forces élastiques se change en énergie cinétique de la tige de distribution (2) et dans la seconde phase d'accélération de la tige de distribution (2), l'énergie potentielle du champ magnétique se change en énergie cinétique de la tige de distribution (2) ce qui contribue à l'accélération du mouvement de la tige de distribution (2), caractérisée en ce qu' avant le point mort de la tige de distribution (2) au moins dans la zone d'extrémité de la première phase de la décélération de la tige de distribution (2) la force croissante est exercée sur la tige de distribution (2) par rapport à la trajectoire de déplacement la tige de distribution (2) plus forte que celle dans la seconde phase de décélération, tandis que le champ de force élastique présente une caractéristique plate, donc les différences de forces élastiques au cours du cycle de flou sont réduits au minimum.

2. Machine textile comportant un dispositif pour la distribuiton du fil (3) enroulé sur une bobine d'enroulement (72) monté dans le mécanisme d'enroulement de l'unité du travail de la machine textile comprenant le long de l'agencement de la machine la tige arrangée de distribution (2) commune à un certain nombre d'emplois d'une côté de la machine, couplée avec un entraînement donnant à elle un mouvement rectiligne linéaire de la course variable et au moins deux paires magnétiques formés par les mêmes pôles des aimants qui se font face sur le châssis (1) et sur la tige de distribution (2), caractérisée en ce que les paires magnétiques sont constitués d'au moins un aimant mobile (210, 220) monté sur la tige de distribution (2) et deux aimants fixes (5, 6) qui sont montés sur le châssis de la machine par l'intermédiaire d'au moins un moyen déformable élastiquement dans un état précontraint, tandis que la force (F1) de la précharge des moyens élastiquement déformables est inférieure à la force de répulsion mutuelle du paire magnétique dans les contacts mutuels des pôles identiques, tandis que le moyen élastiquement déformable a une caractéristique linéaire plane de sorte que juste avant d'atteindre le point mort de la tige de distribution (2) il y aurait une réduction significative de la croissance rapide de la force de la répulsion mutuelle du paire magnétique et les différences des forces élastiques au cours du cycle de flou seraient réduites au minimum.

3. Machine textile selon la revendication 2, caractérisée en ce que chacun des deux aimants fixes (5, 6) est couplé à un seul moyen élastiquement déformable.

4. Machine textile selon la revendication 2, caractérisée en ce que deux aimants fixes (5, 6) sont couplés à un moyen commun élastiquement déformable.

5. Machine textile selon la revendication 4, caractérisée en ce que les aimants fixes (5, 6) sont montés coulissants dans une cavité d'un boîtier commun (4) fermement couplés au châssis de la machine (1) et disposés coaxialement à la tige de la distribution (2), tandis que le moyen élastiquement déformable est disposé entre les aimants fixes (5, 6), tandis que les aimants mobiles (210, 220) sont montés sur la tige de distribution (2) à l'extérieur du boîtier (4) de sorte que le boîtier (4) est situé entre les aimants mobiles tandis que la différence de la distance (vp1) des faces mutuellement opposées des aimants mobiles (210, 220) et de la distance (vo1) des faces mutuellement opposées des aimants fixes (5, 6) dans l'état précontraint du moyen élastiquement déformable est égale à la course de base de la tige de distribution (2) qui est inférieure à la course effective de la tige de distribution (2).

6. Machine textile selon la revendication 3, caractérisée en ce que chaque aimant fixe (5, 6) est monté coulissant dans la cavité de l'un des deux boîtier séparés (8) reliés rigidement au châssis (1) de la machine et disposés coaxialement à la tige de distribution (2) tandis que le moyen élastiquement déformable est toujours disposé entre le fond du boîtier (8) et l'aimant fixe (5, 6), tandis que les aimants mobiles (210, 220) ou l'aimant mobile (200) sont fixé sur la tige de distribution (2) dans la zone entre les boîtiers (8), tandis que la différence de la distance (vp2) des faces mutuellement opposées des aimants fixes (5, 6) dans l'état précontraint du moyen élastiquement déformable et de la distance (vo2) des faces opposées des aimants mobiles (210, 220) ou des faces de l'aimant mobile (200) est égale à la course de base de la tige de distribution (2) qui est inférieure à la course effective de la tige de distribution (2).

7. Machine textile selon la revendication 5 ou 6, caractérisée en ce que les boîtiers (4, 8) sont montés sur le châssis (1) de la machine entre deux postes de travail adjacents de la machine.

8. Machine textile selon l'une quelconque des revendications 2 à 5, caractérisée en ce que les aimants mobiles (210, 220) sont fixés sur la tige de distribution (2) d'une manière réglable.

9. Machine textile selon l'une quelconque des revendications 2 à 8, caractérisée en ce que les aimants (5, 6, 200, 210, 220) sont disposés symétriquement par rapport à l'axe longitudinal de la tige de distribution (2).

10. Machine textile selon la revendication 9, caractérisée en ce que les aimants (5, 6, 200, 210, 220) sont formés en anneaux.

11. Machine textile selon l'une quelconque des revendications 2 à 10, caractérisée en ce que le moyen élastiquement déformable est formé par un ressort.

12. Machine textile selon la revendication 11, caractérisée en ce que le ressort est un ressort hélicoïdal de poussée (44, 84).

Drawing