METHOD FOR CONTROLLED WINDING OF A TEXTILE PRODUCT ON A TEXTILE MACHINE, AND TEXTILE MACHINE

Description

[0001] The present invention relates to a method for controlled winding of a textile product on a textile machine, and a textile machine suitable for implementing such a method.

[0002] The invention can be conveniently applied on weaving machines, such as rapier looms, air-jet looms, water-jet looms, shuttle looms, narrow ribbon weaving machines, etc, as well as on knitting machines etc, to simplify construction and improve the quality of the product by an enhanced control of tensioning in the textile product collected on winding reel.

[0003] In the disclosure of the present invention, "reel" means a spool, reel, beam or other type of cylindrical body carrying threads or textile products wound in coils around a generally cylindrical core. By "electric motor" is meant an electric induction motor, such as a DC motor, AC motor or, preferably, a DC brushless motor.

[0004] Textile machines typically provides one or more supply unit, e.g. a supply reel from which warp threads are delivered towards a threads-interlacing area. At the threads-interlacing area, threads-interlacing devices are caused to form a textile product by interlacing the warp yarns supplied from the supply reel, possibly with insertion of weft yarns and/or other yarns depending on the type of the machine and/or required textile pattern.

[0005] A dragging drive system including a dragging roller operates on the textile product at the threads-interlacing area or immediately downstream thereof, to pull the warp yarns from the supply reels and move the textile product away from the threads-interlacing area. Downstream of the threads-interlacing area, the textile product is collected by winding into superposed coil on a winding reel.

[0006] Tensioning force of the textile product reaching the winding reel is a critical parameter to obtain a good quality in the final product. For example, a poor tensioning force during loose winding may cause wrinkling or other defects in the textile product, as well as a reduced amount of textile product for a given diameter of the reel. Likewise, excessive tensioning could cause overstretching and consequent structural defects and permanent damages on the wound textile product.

[0007] At present, attempts have been made to control the tensioning force by driving rotation of the winding reel by a mechanic transmission of the motion from the dragging drive system. Known arrangements provide a mechanical clutch operating along the mechanic transmission and equipped with an adjustable torque driving system. The adjustable torque driving system adapts the torque applied on the winding reel in order to keep a desired tensioning force along the textile product extending between the dragging roller and the winding reel. Typically, the adjustable torque driving system operates is response to a winding traction force value that is monitored by a dancer roller acting on the textile product between the dragging roller and the winding reel.

[0008] However, the known arrangements as the one disclosed above do not satisfy the increasing need in term of quality and repeatability of result, because the actual tensioning applied to the textile product is subjected to significant variance with respect to the desired value.

[0009] The known arrangements also require installation of sensors and/or mechanisms to detect the tensioning force applied and/or when the winding reel is full and needs for replacement. Indeed, two force sensors are typically required for each side of a roller, along with related electronic equipment, with consequently increased of costs.

[0010] Moreover, the known systems do not allow to easily obtain a reliable monitoring of the instant diameter of the winding reel, where desired, for example to became timely aware about the need for substitution.

[0011] US 6,431,220 B1 and EP2907905A1 provide control systems capable of controlling the fabric winding tension according to the change in diameter of the winding reel.

[0012] Scope of the present invention is to improve the prior art, in particular by providing a method and an apparatus whereby an accurate control of the tensioning of the textile product leaving the dragging roller is attained.

[0013] A further goal of the invention is to allow an improved control of the tensioning of the warp threads leading to the dragging roller.

[0014] An additional aim of the invention is to allow the above specified accurate controls by a simplified and cheap system, which doesn't necessarily need additional sensors.

[0015] According to the invention, it has been found that an improved tensioning control of the textile product and/or warp threads respectively downstream and upstream of the dragging roller can be achieved by monitoring the rotation speed on the winding reel and/or supply unit with respect to the rotation speed of the dragging roller, and increasing or decreasing the torque applied by a motor on the winding reel and/or the supply unit, in response to variations on the ratio between such rotation speeds.

[0016] More particularly, the invention relates to a method for controlled winding of a textile product on a textile machine, according to claim 1.

[0017] In a further aspect, the invention relates to a textile machine, according to claim 10.

[0018] It is noted that the rotation speed n11 of the dragging roller is always known, e.g. as given by the input control of the motor of the dragging roller, while the winding rotation speed n15 gradually decreases during the production process. Therefore, the ratio between the rotation speeds n11 / n15 in the algorithm used for determining the instant winding torque value is proportional to the instant value of the winding diameter of the textile product on the winding reel. Consequently, any change in the winding diameter, which progressively increases as the textile product is collected on the winding reel during the manufacturing process, causes a corresponding increase in the instant winding torque value applied to the winding reel. Thus, the modulation achieved according to the invention allows an improved control of the winding traction force applied on the textile product at every stage on the production process, irrespective of any change of the winding diameter on the winding reel.

[0019] Notably, torque and rotation speed values on the single dragging roller and winding reel, as well as the supply unit if desired, are directly derivable as input and/or output data from the electronic control unit implementing the respective electric motors. Accordingly, the invention may be implemented without requiring installation of additional sensor systems on the textile machine.

[0020] The winding force control achieved by the invention timely adapt itself to the actual rotation speed n11 of the dragging roller. Thus, the rotation speed n11 of the dragging roller may be freely controlled to change according to any desired textile program or pattern, without affecting the efficiency of the winding force control.

[0021] It is also noted that the winding rotation speed n15 is proportional to the instant winding diameter, as well as a rotation speed n2 of the supply unit is proportional to the instant diameter of the supply unit. Therefore, the invention allows an ease monitoring of the diameter of the winding reel and, if desired, the supply unit, e.g. to provide warning signals for substitution when the winding reel or, if desired, the supply unit are going to be full or empty, respectively, without need for additional sensor devices.

[0022] In at least one preferred embodiment, the invention may also include one or more of the following preferred technical features.

[0023] Preferably, the winding motor is activated by a winding supply current 117 calculated according to the formula:

wherein kT17 represents a current constant of the winding motor.

[0024] As known, the current constant is a motor specific value, typically expressed in Nm/A unit.

[0025] Preferably, the instant value of the winding torque WT is applied to the winding reel through a winding gearbox reducer which connects the winding motor to the winding reel according to a winding transmission ratio i18.

[0026] Preferably, the winding motor is activated by a winding supply current 117 calculated according to the formula:

wherein kT17 represents the current constant of the winding motor.

[0027] The efficiency of the winding gearbox reducer can be introduced as an additional factor in the formula if a greater precision is required.

[0028] Preferably, reiteration of the winding adjustment cycle occurs at a desired frequency.

[0029] Preferably, said desired frequency is comprised between 1 Hz and 10 Hz. Preferably, said desired frequency is kept constant.

[0030] Preferably, said desired frequency gradually varies during operation of the machine.

[0031] Preferably, at least 1 winding adjustment cycle is achieved for each revolution of the winding reel around the winding rotation axis. If desired, the number of these adjustment cycles may be increased, e.g. up to 5 cycles for each revolution of the winding reel, to calculate a more reliable average value.

[0032] Preferably, a controlled change in the target value WFtv of the winding traction force WF occurs during operation of the textile machine. Preferably, the winding traction force WF gradually decreases as the winding diameter WD grows, or vice-versa.

[0033] According to a different aspect of the invention, the supply unit rotates on an unwind rotation axis to unwind the warp yarns that move towards the threads-interlacing area; a supply torque ST is applied to the supply unit for providing a supply traction force SF on the warp yarns between the dragging roller and the supply unit; and a control of the supply traction force SF is achieved during operation of the textile machine to keep it at a desired target value SFtv.

[0034] Preferably, control of the supply traction force SF is achieved by modulating a supply rotation speed n2 of the supply unit to keep the supply traction force SF at the target value SFtv.

[0035] Preferably, modulating the supply rotation speed n2 includes repeated supply adjustment cycles, each comprising:

acquiring a drag supply current 112 of a drag motor;

calculating a drag torque DT applied to the dragging roller as a function of the drag supply current I12;

calculating an instant value of the supply traction force SF by the formula:

comparing the instant value of the supply traction force SF with the target value SFtv_;

increasing the supply rotation speed n2 when SF > SFtv;

decreasing the supply rotation speed n2 when SF < SFtv.

[0036] For a greater precision, the formula used for calculating the instant value of the supply traction force SF may be modified to take into consideration the winding traction force WF as follows:

[0037] However, WF may be ignored in practice since it is typically much lower than SF.

[0038] Preferably, the drag torque DT is calculated by the formula:

wherein kT2 represents a current constant of the drag motor.

[0039] Preferably, the drag torque DT is applied to the dragging roller through a drag gearbox reducer which connects the drag motor to the dragging roller according to a drag transmission ratio i13.

[0040] Preferably, the drag torque DT is calculated by the formula:

wherein kT2 represents the current constant of the drag motor.

[0041] The efficiency of the drag gearbox reducer can be introduced as an additional factor in the formula if a greater precision is required.

[0042] Preferably, control of the supply traction force SF is achieved by modulating the supply torque ST to keep the supply traction force SF at a desired target value SFtv.

[0043] Preferably, modulating the supply torque ST includes repeated supply adjustment cycles, each comprising:

acquiring a supply rotation speed n2 of the supply unit;

acquiring the dragging rotation speed n11 of the dragging roller; and

applying to the supply unit a supply torque target value STtv calculated by the formula:

[0044] Wherein UD represents an instant unwinding diameter UD on the supply unit.

[0045] Preferably, the central processing unit is configured to calculate an instant unwinding diameter UD on the supply unit basing on a supply rotation speed n2 of the supply unit and a dragging rotation speed n11 of the dragging roller, according to the formula:

[0046] Preferably, modulating the supply torque ST includes repeated supply adjustment cycles, each comprising:

acquiring a supply rotation speed n2 of the supply unit;

acquiring the dragging rotation speed n11 of the dragging roller; and

applying to the supply unit a supply torque target value STtv calculated by the formula:

[0047] Preferably, reiteration of the supply adjustment cycle occurs at a desired frequency.

[0048] Preferably, said desired frequency for the supply adjustment cycle is comprised between 1 Hz and 10 Hz.

[0049] Preferably, said desired frequency is kept constant.

[0050] Preferably, said desired frequency gradually varies during operation of the textile machine.

[0051] Preferably, at least 1 supply adjustment cycle is achieved for each revolution of the supply unit around the unwind rotation axis.

[0052] If desired, the number of these adjustment cycles may be increased, e.g. up to 5 cycles for each revolution of the supply unit, to calculate a more reliable average value.

[0053] Preferably, a controlled change in the target value SFtv of the supply traction force SF occurs during operation of the textile machine. Preferably, the detector includes a winding electronic control unit equipping the winding motor and configured for detecting a rotation speed n17 of the winding motor.

[0054] Preferably, provision is made of a winding gearbox reducer operating between the winding motor and the winding reel, and a winding controller configured for receiving the rotation speed n17 detected by the winding electronic control unit and calculating a winding rotation speed n15 of the winding reel basing on a transmission ratio i18 of the winding gearbox reducer according to the formula n15 = n17 * i18

[0055] Preferably, provision is made of a drag electronic control unit equipping a drag motor of the dragging roller and configured for detecting a rotation speed n12 of the drag motor.

[0056] Preferably, provision is made of a drag gearbox reducer operating between the drag motor and the dragging roller, and a drag controller configured for receiving the rotation speed n12 detected by the drag electronic control unit and calculating a dragging rotation speed of the dragging roller basing on a transmission ratio i13 of the drag gearbox reducer according to the formula n11 = n12 * i13

[0057] According to a further different aspect, provision is preferably made of an unwinding drive unit configured for applying a supply torque opposing rotation of the supply unit around an unwind rotation axis, whereby a supply traction force is SF is provided on the warp yarns between the dragging roller and the supply unit.

[0058] Preferably, provision is made of a drag electronic control unit equipping a drag motor of the dragging roller and configured for acquiring a drag supply current I12 of the drag motor.

[0059] Preferably, provision is made of a drag controller configured for calculating a drag torque DT applied to the dragging roller as a function of the drag supply current I12.

[0060] Preferably, said central processing unit is further configured for calculating the supply traction force SF by the formula:

[0061] Preferably, provision is made of a comparator configured for comparing the supply traction force SF with the target value SFtv.

[0062] Preferably, the central processing unit is further configured for:

increasing the supply rotation speed n2 when SF > SFtv_;

decreasing the supply rotation speed n2 when SF < SFtv.

[0063] Preferably, provision is made of a drag controller configured for receiving the drag supply current I12 detected by the drag electronic control unit and calculating the drag torque DT according to the formula:

wherein kT12 represents the current constant of the drag motor.

[0064] Preferably, provision is made of a drag gearbox reducer operating between the drag motor and the dragging roller, and a drag controller configured for receiving the drag supply current I12 detected by the drag electronic control unit and calculating the drag torque DT basing on a transmission ratio i13 of the drag gearbox reducer according to the formula:

wherein kT12 represents the current constant of the drag motor.

[0065] According to a further different aspect, provision is preferably made of:

an unwind electronic control unit equipping an unwind motor of the supply unit and configured for acquiring a supply rotation speed n2 of the supply unit;

a drag electronic control unit equipping the drag motor and configured for acquiring a dragging rotation speed n11 of the dragging roller 11;

wherein said central processing unit is configured for receiving input signals representative of said supply rotation speed n2 and dragging rotation speed n11, and applying to the supply unit 2 a supply torque target value STtv calculated by the formula:

wherein UD represents an instant unwinding diameter on the supply unit.

[0066] Preferably, the central processing unit is configured to calculate an instant unwinding diameter UD on the supply unit basing on a supply rotation speed n2 of the supply unit and a dragging rotation speed n11 of the dragging roller, according to the formula

[0067] Preferably, modulating the supply torque ST includes repeated supply adjustment cycles, each comprising:

acquiring a supply rotation speed n2 of the supply unit;

acquiring the dragging rotation speed n11 of the dragging roller 11; and

applying to the supply unit a supply torque target value STtv calculated by the formula:

[0068] Preferably, the unwind motor is configured for applying a supply torque ST to the supply unit, whereby a supply traction force SF is applied to the warp yarns between the supply unit and the dragging roller.

[0069] Preferably, provision is made of an unwind electronic control unit equipping the unwind motor and configured for detecting a rotation speed n5 of the unwind motor.

[0070] Preferably, provision is made of an unwind gearbox reducer operating between the unwind motor and the supply unit, and an unwinding controller configured for receiving the rotation speed n5 detected by the unwind electronic control unit and calculating a supply rotation speed n2 of the supply unit 2 basing on a transmission ratio i6 of the unwind gearbox reducer according to the formula n2 = n5 * i6

[0071] Additional features and advantages will be clearer from the detailed description of a preferred but not exclusive embodiment of a method for controlled winding of a textile product on a textile machine, and a textile machine suitable for implementing such a method, in accordance with the present invention. Such description will be set forth hereinbelow with reference to the set of drawings, provided only as a non-limiting example, wherein:

• figure 1 schematically shows a side elevation sectional view of an exemplary textile machine equipped with a control system for implementing the method according to the present invention;
• figure 2 is an operation logic flowchart of the textile machine implementing the winding control method according to the invention;
• figure 3 is an operation logic flowchart of the textile machine implementing a supply traction force control upstream of dragging drive system in the textile machine.

[0072] In figure 1, a textile machine is generally indicated by reference 1. The textile machine 1 may be, for example, a rapier loom, air-jet loom, water-jet loom, shuttle loom, a narrow ribbon weaving machines, a knitting machine or other type of textile machine 1.

[0073] The textile machine 1 comprises at least one supply unit 2, for example in the form of at least one supply reel or roller. A plurality of warp yarns 3 is unwound from the supply unit 2 as the supply unit 2 rotates around a respective unwind rotation axis X2, upon action of an unwinding drive unit 4. In an alternative possible solution not shown in the drawings, the supply unit 2 rotating upon control by the unwinding drive unit 4, may be configured to unwind the warp yarns 3 from respective spools carried by one or more creels.

[0074] The unwinding drive unit 4 comprises a unwind motor 5, preferably connected to the supply unit 2 through an unwind gearbox reducer 6. The unwind motor 5 is conveniently governed by an unwind electronic control unit 7, which is capable to control the rotation speed, supply current, and/or other operational parameters of the unwind motor 5. More particularly, a brushless-type motor equipped with the unwind electronic 7 control unit can be conveniently used as unwind motor 5.

[0075] The warp yarns 3 drawn from the supply unit 2 are longitudinally moved to reach a threads-interlacing area 8 (e.g. a weaving area or knitting area), wherein threads-interlacing devices (not shown) operates for producing a textile product 9 from the warp yarns 3 supplied by the supply unit 2. To this aim, the warp yarns 3 may be linked each other and/or with one or more weft yarns, and/or other additional yarns, in any known manner which is herein not disclosed as not forming part of the present invention. The threads-interlacing devices typically may include or consists of thread guiding elements cooperating with oscillating members: they are not shown as well in the drawings, as they may be realized in many different knows manners depending on the needs.

[0076] A dragging unit 10 engages the textile product 9 near the threads-interlacing area 8, i.e. at the threads-interlacing area 8 or immediately downstream of it. The dragging unit 10 comprises a dragging roller 11 acting on the textile product 9 to advance it away from the threads-interlacing area 8. The dragging roller 11 also produces a pulling action on the warp yarns 3 coming from the supply unit 2. In figure 1, DD indicates a dragging diameter defined by the dragging roller 11, at an external surface thereof acting on the textile product 9. A drag motor 12 is connected to the dragging roller 11 preferably through a drag gearbox reducer 13, to rotate the dragging roller 11 at controlled angular speed and torque. The drag motor 12 is conveniently governed by a respective drag electronic control unit 14 which is capable to control the rotation speed, supply current, and/or other operational parameters of the drag motor 12. A brushless-type motor equipped with the drag electronic control unit 14 can be conveniently used as drag motor 12.

[0077] The textile product 9 moving from the threads-interlacing area 8 is advanced towards a winding reel 15 configured to receive the textile product 9.

[0078] A winding unit 16 operates on the winding reel 15 to rotate the winding reel 15 around a winding rotation axis X15. The winding unit 16 also applies a winding torque WT to the winding reel 15, whereby a winding traction force WF is applied to the textile product 9, along a stretch thereof extending between the dragging unit 10 and the winding reel 15.

[0079] The winding unit 16 comprises a winding motor 17 preferably connected to the winding reel 15 through a winding gearbox reducer 18. The winding motor 17 is conveniently governed by a winding electronic control unit 19, which is capable to control the rotation speed, supply current, and/or other operational parameters of the winding motor 17. More particularly, a brushless-type motor equipped with the winding electronic control unit 19 can be conveniently used as winding motor 17.

[0080] Rotation of the winding reel 15 causes the textile product 9 to be wound into respectively superposed coils 9a, each according to a winding diameter WD, around the winding rotation axis X15. The thickness of the textile product 9 causes the winding diameter WD being different for each coil 9a. Indeed, the winding diameter WD progressively grows as soon as each coil 9a is formed around the winding rotation axis X15 of the winding reel 15.

[0081] Any change in the winding diameter WD would affect the value of the winding traction force WF, if the winding torque WT applied by the winding unit 16 on the winding reel 15 were kept constant. However, the invention provides for gradually modulating, i.e. adjusting, the winding torque WT while the textile product 9 is formed and wound on the winding reel 15, to keep the winding traction force WF at a desired target value WFtv. The desired target value WFtv of the winding traction force WF may be conveniently set by the user, or selected by a stored library, or provided by a job program. If desired, the target value WFtv of the winding traction force WF may be changed according to the established job program during prosecution of the job, for example being increased and/or reduced along with gradual growing of the winding diameter WD.

[0082] At least one detector 19, 20 acts on the winding reel 15 for detecting the instant winding diameter WD, or a representative parameter thereof, on the textile product 9 wound on the winding reel 15 at any moment in time. In a preferred embodiment, such detector includes the winding electronic control unit 19 equipping the winding motor 17. Indeed, as it usually occurs in control systems of brushless motors, the winding electronic control unit 19 is capable of detecting at any moment a rotation speed n17 of the winding motor 17, i.e. of a rotor thereof. The rotation speed n17 is received as an input signal by a winding controller 20, to calculate a winding rotation speed n15 of the winding reel 15 basing on the value of a winding transmission ratio i18 of the winding gearbox reducer 18 according to the formula:

[0083] The winding controller 20 may be embedded within the winding electronic control unit 19 or separated therefrom, for example as a part of a central processing unit CPU overseeing the operation of the entire textile machine 1 or a relevant part thereof as shown in figure 1.

[0084] In a similar way, the drag electronic control unit 14 is capable of detecting at any moment a rotation speed n12 of the drag motor 12, i.e. a rotor thereof. The rotation speed n12 is received as an input signal by a drag controller 21, e.g embedded within the drag electronic control unit 14 or separated therefrom, for example as a part of the central processing unit CPU, to calculate a dragging rotation speed n11 of the dragging roller 11 basing on the value of a drag transmission ratio i13 of the respective drag gearbox reducer 13 by the formula n11 = n12 * i13

[0085] The drag controller 21 may be embedded within the drag electronic control unit 14 or separated therefrom, for example as a part of the central processing unit CPU.

[0086] With particular reference to figure 2 modulation, i.e. adjustment, of the winding traction force WF is obtained according to the following method. Such a method may be achieved by the central processing unit CPU or other parts of the textile machine 1 which may be programmed or configured to control winding of the textile product 9 as follows.

[0087] At the start of the textile machine 1 (diagram block 22), the target value WFtv of the winding traction force WF is set (diagram block 23), e.g by the user through an input interface, or by selection from a stored menu. Such a selection may be a part of a stored job program.

[0088] As derivable from diagram block 24 in figure 2, the winding rotation speed n15 (diagram sub-block 24a) and the dragging rotation speed n11 (diagram sub-block 24b) are acquired, e.g. derived as above disclosed, from the data detected by the winding electronic control unit 19 and drag electronic control unit 14, respectively.

[0089] Basing of the acquired values of the speeds n11 and n15, the instant winding diameter WD is also detected (diagram block 25). More particularly, the instant winding diameter WD is conveniently calculated by the formula:

[0090] Indeed, since no significant slipping/stretching of the textile product 9 occurs on the external surfaces of the dragging roller 11 and winding reel 15, the ratio between the diameters WD / DD equals the ratio between the rotation speeds n11 / n15.

[0091] Basing on the detected value of the instant winding diameter WD, an instant value of the winding torque WT, suitable to achieve the previously set target value of the winding traction force WFtv, is then calculated (block diagram 26). More particularly, the instant value of the winding torque WT value is calculated by the formula:

[0092] The obtained instant value of the winding torque WT is then applied to the winding reel 15 through the winding motor 17 and respective winding gearbox reducer 18 (diagram block 27). For example, achievement of the desired instant value of the winding torque WT may be obtained by activating the winding motor 17, upon command of the winding electronic control unit 19, by a winding supply current I17 calculated according to the formula:

wherein kT17 represents the current constant, i.e. a specific (nearly) constant value of the winding motor 17.

[0093] The above-described winding adjustment cycle is repeated during operation of the textile machine 1, so that the instant value of the winding torque WT may be timely updated during the gradual growing of the winding diameter WD to keep the desired target value WFtv of the winding traction force WF.

[0094] Reiteration of the winding adjustment cycle may occur at a desired frequency, preferable comprised between 1 Hz and 10 Hz. The frequency may be kept constant or gradually vary during operation of the machine, for example to achieve a fixed number, preferably at least 1 winding adjustment cycle for each revolution achieved by the winding reel 15 around the winding rotation axis X15.

[0095] If desired, any controlled change in the target value WFtv of the winding traction force WF may also be achieved during operation of the textile machine 1, e.g. according to a pre-established job program. For example, depending on the production specifications, a greater winding traction force WF may be set for the first coils 9a on the winding reel 15, when the winding diameter WD is relatively small, to gradually decrease the winding traction force WF as the winding diameter WD grows, or vice-versa. During operation of the textile machine 1, the supply unit 2 rotates upon the unwind rotation axis X2 to unwind the warp yarns 3 that move towards the threads-interlacing area 8.

[0096] The unwind motor 5 and unwind gearbox reducer 6 apply a supply torque ST to the supply unit 2. Preferably, the supply torque ST opposes rotation the supply unit 2 undergoes upon the action exerted by the dragging unit 10 on the warp yarns 3, although without preventing rotation required for unwinding the warp yarns 3. Thus, a supply traction force SF is maintained along the warp yarns 3 extending between the supply unit 2 and the dragging roller 11.

[0097] An efficient control of the supply traction force SF is critical for the correct execution of the mutual interlinking of the warp yarns 3 each other and/or with the weft yarns and/or other yarns at the threads-interlacing area 8.

[0098] At least when the supply unit 2 is in the form of a reel carrying the warp yarns 3 wound around the unwind rotation axis X2, rotation of the supply unit 2 causes the external diameter thereof, hereinafter also referred as unwinding diameter UD, to gradually decrease as the warp yarns 3 are unwound from the unwinding reel 15. Therefore, the supply traction force SF would gradually increase in response to a progressive reduction of the unwinding diameter UD during operation of the textile machine 1, if the supply torque ST were kept constant. However, according to a different and independent aspect of the invention, a positive control of the supply traction force SF is preferably achieved to keep this latter at a desired target value SFtv.

[0099] As shown in figure 3, the desired target value SFtv of the supply traction force SF may be conveniently set by in the user (see diagram block 28 in figure 3) or provided by a job program, at or just after start 22 of the textile machine 1. If desired, the target value SFtv of the supply traction force SF may be changed according to a pre-established program during operation of the textile machine 1, for example being increased and/or reduced along with prosecution of the job in response to changes in the weaving pattern executed in the threads-interlacing area 8. Indeed, for example, a pre-established weaving pattern may include a production stage wherein, e.g. due to insertion of additional yarns in the threads-interlacing area 8 or for other reasons, the supply traction force SF is required to be greater or lower than a previous or subsequent production stage, for optimization of the result.

[0100] In a preferred embodiment, control of the supply traction force SF is achieved by modulating a supply rotation speed n2 of the supply unit 2 to keep the supply traction force SF at the target value SFtv. Indeed, the central processing unit CPU may be configured for achieving repeated supply adjustment cycles, each comprising calculating the instant value of the supply traction force SF basing on a drag torque DT applied to the dragging roller 11. The drag torque DT may be calculated by the drag controller 21 as a function of a drag supply current I12 of the drag motor 12. The drag supply current I12 may be acquired by the drag electronic control unit 14 (diagram block 29). Then (diagram block 30), the drag torque DT may be calculated by the formula:

wherein kT12 represents the current constant of the drag motor 12.

[0101] Preferably, the instant value of the supply traction force SF is then calculated (diagram block 31) according the formula

which also considers the effect of the winding traction force WF applied to the textile product 9.

[0102] A comparator (not shown), e.g. embedded within the central processing unit CPU or separated therefrom, may be provided for comparing the instant value of the supply traction force SF with the target value SFtv thereof. If the instant value of the supply traction force SF equals the target value SFtv (diagram block 32), a new supply adjustment cycle is achieved.

[0103] Otherwise (diagram block 33), the comparator determines if the instant supply traction force SF is smaller than the target value SFtv. In the affirmative the central processing unit CPU drives the unwind motor 5 to increase the supply rotation speed n2 (diagram block 34). Otherwise, the supply rotation speed n2 is decreased (diagram block 35).

[0104] Increasing and decreasing the rotation speed n2 causes a corresponding decreasing and increasing, respectively, of the supply traction force SF toward the target value SFtv.

[0105] Any adjustment in the supply rotation speed n2 triggers a new supply adjustment cycle as shown in figure 3. Reiteration of the supply adjustment cycle may occur at a desired frequency, preferably comprised between 1 Hz and 10 Hz. The frequency may be kept constant or gradually vary during operation of the machine, for example to achieve a pre-determined number, preferably at least 1 supply adjustment cycle for each revolution achieved by the supply unit 2 around the unwind rotation axis X2.

[0106] In a possible alternative embodiment, control of the supply traction force SF may be achieved by modulating the supply torque ST, instead of the supply rotation speed n2, to keep the supply traction force SF at the desired target value SFtv. In this case, each supply adjustment cycle will include acquiring the dragging rotation speed n11 of the dragging roller 11 and acquiring the supply rotation speed n2 of the supply unit 2. These acquiring steps may be respectively achieved by the drag controller 21, and by an unwinding controller 36. The unwinding controller 36 receives a rotation speed n5 of the unwind motor 5, i.e. of a rotor thereof, as an input signals, and may be configured for calculating the supply rotation speed n2 of the supply unit 2 basing on a transmission ratio i6 of the unwind gearbox reducer 6 according to the formula:

[0107] The unwinding controller 36 may be embedded within the unwind electronic control unit 7 or separated therefrom, for example as a part of the central processing unit CPU. The central processing unit CPU may be configured to receive input signals representative of the acquired values, and to command the unwind motor 5 for applying to the supply unit 2 a target torque value STtv calculated by the formula:

[0108] As additional or alternative measure, the central processing unit CPU may be configured to calculate an instant unwinding diameter UD on the supply unit 2 basing on the supply rotation speed n2 and the dragging rotation speed n11 of the dragging roller 11, according to the formula

[0109] The target torque value STtv may be accordingly calculated by the formula:

Claims

1. Method for controlled winding of a textile product (9) on a textile machine, wherein:

warp yarns (3) are unwound from a supply unit (2) and longitudinally moved to reach a threads-interlacing area (8);

a textile product (9) including said warp yarns (3) is formed at the threads-interlacing area (8);

a dragging roller (11) having an external diameter DD engages the textile product (9) near the threads-interlacing area (8), and rotates at a dragging rotation speed n11 to advance the textile product (9) toward at least one winding reel (15);

the winding reel (15) rotates on a winding rotation axis (X15) to wind the textile product (9) into respectively superposed coils (9a) each according to an instant winding diameter WD;

a winding torque WT is applied to the winding reel (15) for providing a winding traction force WF on the textile product (9) between the dragging roller (11) and the winding reel (15);

the method further comprising:

modulating the winding torque WT to keep the winding traction force WF at a desired target value WFtv,

characterized in that modulating the winding torque WT includes repeated winding adjustment cycles, each comprising:

acquiring a winding rotation speed n15 of the winding reel (15);

acquiring the dragging rotation speed n11 of the dragging roller (11);

detecting the instant winding diameter WD; and

applying an instant value of the winding torque WT calculated by the formula:

wherein during one or more of said winding adjustment cycles, detection of the instant winding diameter WD is made by calculating the instant winding diameter WD by the formula:

2. Method according to claim 1, wherein reiteration of the winding adjustment cycle occurs at a frequency comprised between 1 Hz and 10 Hz.

3. Method according to one or more of the preceding claims, wherein at least one winding adjustment cycle is achieved for each revolution of the winding reel (15) around the winding rotation axis (X15).

4. Method according to one or more of the preceding claims, wherein a controlled change in the target value WFtv of the winding traction force WF occurs during operation of the textile machine (1).

5. Method according to one or more of the preceding claims, wherein the winding traction force WF gradually decreases as the winding diameter WD grows, or vice-versa.

6. Method according to one or more of the preceding claims, wherein:

the supply unit (2) rotates on an unwind rotation axis (X2) to unwind the warp yarns (3) that move towards the threads-interlacing area (8);

a supply torque ST is applied to the supply unit (2) for providing a supply traction force SF on the warp yarns (3) between the dragging roller (11) and the supply unit (2); and

a control of the supply traction force SF is achieved during operation of the textile machine (1) to keep it at a desired target value SFtv.

7. Method according to claim 6, wherein control of the supply traction force SF is achieved by modulating a supply rotation speed n2 of the supply unit (2) to keep the supply traction force SF at the target value SFtv.

8. Method according to claim 7, wherein modulating the supply rotation speed n2 includes repeated supply adjustment cycles, each comprising:

acquiring a drag supply current I12 of the drag motor (12);

calculating a drag torque DT applied to the dragging roller (11) as a function of the drag supply current I12;

calculating an instant value of the supply traction force SF by the formula:

comparing the instant value of the supply traction force SF with the target value SFtv_;

increasing the supply rotation speed n2 when SF > SFtv;

decreasing the supply rotation speed n2 when SF < SFtv.

9. Method according to one or more of claims 6 to 8, wherein a controlled change in the target value SFtv of the supply traction force SF occurs during operation of the textile machine (1).

10. Textile machine, comprising

at least one supply unit (2) configured for carrying warp yarns (3);

threads-interlacing devices acting at a threads-interlacing area (8) for producing a textile product (9) by the warp yarns (3) supplied from the supply unit (2);

a dragging roller (11) having an external diameter DD configured to engage the textile product (9) near the threads-interlacing area (8), and advance it away from the threads-interlacing area (8);

a winding reel (15) configured to receive the textile product (9) advanced by the dragging roller (11) and rotatable on a winding rotation axis (X15) to wind the textile product (9) into respectively superposed coils (9a) each according to an instant winding diameter WD;

a winding motor (17) configured for applying a winding torque WT to the winding reel (15), whereby a winding traction force WF is applied to the textile product (9) between the dragging roller (11) and the winding reel (15);

a detector acting on the winding reel (15), the detector detecting the instant winding diameter WD of the textile product (9) wound on the winding reel (15);

characterized in that the detector comprises a central processing unit (CPU) configured to operate repeated winding adjustment cycles to receive an input signal representative of the instant winding diameter WD and acting on the winding motor (17) for modulating the winding torque WT calculated as a function of the instant winding diameter WD according to the formula WT = WFtv * WD 12, to keep the winding traction force WF at a predetermined target value WFtv,

wherein the central processing unit (CPU) is configured to:

acquire a winding rotation speed n15 of the winding reel (15);

acquire a dragging rotation speed n11 of the dragging roller (11); and

calculate the instant winding diameter WD basing on a winding rotation speed n15 of the winding reel (15) and a dragging rotation speed n11 of the dragging roller (11), according to the formula:

11. Textile machine according to claim 12, further comprising an unwinding drive unit (4) configured for applying a supply torque opposing rotation of the supply unit (2) around an unwind rotation axis (X2), whereby a supply traction force SF is provided on the warp yarns (3) between the dragging roller (11) and the supply unit (2).

12. Textile machine according to claim 11, further comprising:

a drag electronic control unit (14) equipping a drag motor (12) of the dragging roller (11) and configured for acquiring a drag supply current I12 of the drag motor (12);

a drag controller (21) configured for calculating a drag torque DT applied to the dragging roller (11) as a function of the drag supply current I12;

wherein said central processing unit (CPU) is further configured for calculating the supply traction force SF by the formula:

13. Textile machine according to claim 11 or 12, further comprising a comparator configured for comparing the supply traction force SF with a target value SFtv of the supply traction force SF, wherein the central processing unit (CPU) is further configured for:

increasing the supply rotation speed n2 when SF > SFtv;_;

decreasing the supply rotation speed n2 when SF < SFtv.

Ansprüche

1. Verfahren zum gesteuerten Aufwickeln eines Textilprodukts (9) auf eine Textilmaschine, bei dem:

Kettgarne (3) von einer Zuführeinheit (2) abgewickelt und längslaufend bewegt werden, um einen Fadenverschlingungsbereich (8) zu erreichen;

ein Textilprodukt (9), das die genannten Kettgarne (3) enthält, in dem Fadenverschlingungsbereich (8) gebildet wird;

eine Schleppwalze (11), die einen Außendurchmesser DD aufweist, das Textilprodukt (9) in der Nähe des Fadenverschlingungsbereichs (8) in Eingriff nimmt und bei einer Schleppdrehzahl n11 dreht, um das Textilprodukt (9) zu mindestens einer Wickelrolle (15) zu befördern;

die Wickelrolle (15) um eine Wickeldrehachse (X15) dreht, um das Textilprodukt (9) jeweils gemäß einem aktuellen Wickeldurchmesser WD in entsprechende überlagerte Spulen (9a) zu wickeln;

ein Wickelmoment WT auf die Wickelrolle (15) aufgebracht wird, um eine Wickelzugkraft WF auf dem Textilprodukt (9) zwischen der Schleppwalze (11) und der Wickelrolle (15) zur Verfügung zu stellen;

wobei das Verfahren außerdem Folgendes umfasst:

Modulierung des Wickelmoments WT, um die Wickelzugkraft WF auf einem gewünschten Zielwert Wftv zu halten,

dadurch gekennzeichnet, dass die Modulierung des Wickelmoments WT wiederholte Wickeleinstellzyklen einschließt, von denen jeder Folgendes umfasst:

Erfassung einer Abwickeldrehzahl n15 der Wickelrolle (15);

Erfassung der Schleppdrehzahl n11 der Schleppwalze (11);

Erfassung des aktuellen Wickeldurchmessers WD; und

Anwendung eines Momentwerts des Wickelmoments WT, der mit der folgenden Formel berechnet wird:

wobei während eines oder mehrerer der genannten Wickeleinstellzyklen

die Erfassung des aktuellen Wickeldurchmessers WD durch Berechnung des aktuellen Wickeldurchmessers WD mit der folgenden Formel erfolgt:

2. Verfahren nach Anspruch 1, wobei die Wiederholung des Wickeleinstellzyklus bei einer Frequenz zwischen 1 Hz und 10 Hz erfolgt.

3. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, wobei mindestens ein Wickeleinstellzyklus für jede Umdrehung der Wickelrolle (15) um die Wickeldrehachse (X15) ausgeführt wird.

4. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, wobei eine gesteuerte Änderung des Zielwerts WFtv der Wickelzugkraft WF während des Betriebs der Textilmaschine (1) erfolgt.

5. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, wobei die Wickelzugkraft WF mit zunehmendem Wickeldurchmesser WD allmählich abnimmt oder umgekehrt.

6. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, wobei:

die Zuführeinheit (2) um eine Abwickeldrehachse (X2) dreht, um die Kettgarne (3) abzuwickeln, die sich zu dem Fadenverschlingungsbereich (8) bewegen;

ein Zuführmoment ST auf die Zuführeinheit (2) aufgebracht wird, um eine Zuführzugkraft SF auf den Kettgarnen (3) zwischen der Schleppwalze (11) und der Zuführeinheit (2) zur Verfügung zu stellen; und

eine Steuerung der Zuführzugkraft SF während des Betriebs der Textilmaschine (1) ausgeführt wird, um sie auf einem gewünschten Zielwert Sftv zu halten.

7. Verfahren nach Anspruch 6, wobei die Steuerung der Zuführzugkraft SF durch Modulierung einer Zuführdrehzahl n2 der Zuführeinheit (2) ausgeführt wird, um die Zuführzugkraft SF auf dem Zielwert Sftv zu halten.

8. Verfahren nach Anspruch 7, wobei die Modulierung der Zuführdrehzahl n2 wiederholte Zuführungseinstellzyklen einschließt, von denen jeder Folgendes umfasst:

Erfassen eines Schleppversorgungsstroms 112 des Schleppmotors (12);

Berechnung eines Schleppmoments DT, das abhängig von dem Schleppversorgungsstrom 112 auf die Schleppwalze (11) aufgebracht wird;

Berechnung eines Momentwerts der Zuführzugkraft SF anhand der Formel:

Vergleichen des Momentwerts der Zuführzugkraft SF mit dem Zielwert SFtv;

Steigerung der Zuführdrehzahl n2 wenn SF > SFtv;

Verringerung der Zuführdrehzahl n2 wenn SF < SFtv.

9. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche 6 bis 8, wobei eine gesteuerte Änderung des Zielwerts SFtv der Zuführzugkraft SF während des Betriebs der Textilmaschine (1) erfolgt.

10. Textilmaschine, umfassend

mindestens eine Zuführeinheit (2), die darauf ausgelegt ist, Kettgarne (3) zu tragen;

Fadenverschlingungsvorrichtungen, die in einem Fadenverschlingungsbereich (8) wirken, um mit den von der Zuführeinheit (2) zugeführten Kettgarnen (3) ein Textilprodukt (9) herzustellen;

eine Schleppwalze (11), die einen Außendurchmesser DD aufweist und darauf ausgelegt ist, das Textilprodukt (9) in der Nähe des Fadenverschlingungsbereichs (8) in Eingriff zu nehmen und es von dem Fadenverschlingungsbereich (8) weg zu befördern;

eine Wickelrolle (15), die darauf ausgelegt ist, das von der Schleppwalze (11) beförderte Textilprodukt (9) zu erhalten, und um eine Wickeldrehachse (X15) drehbar ist, um das Textilprodukt (9) gemäß einem aktuellen Wickeldurchmesser WD in entsprechende überlagerte Spulen (9a) zu wickeln;

einen Wickelmotor (17), der darauf ausgelegt ist, ein Wickelmoment WT auf die Wickelrolle (15) aufzubringen, wodurch zwischen der Schleppwalze (11) und der Wickelrolle (15) eine Wickelzugkraft WF auf das Textilprodukt (9) aufgebracht wird;

einen Detektor, der auf die Wickelrolle (15) wirkt, wobei der Detektor den aktuellen Wickeldurchmesser WD des auf die Wickelrolle (15) gewickelten Textilprodukts (9) erfasst;

dadurch gekennzeichnet, dass der Detektor einen Hauptprozessor (CPU) umfasst, der darauf ausgelegt ist, wiederholte Wickeleinstellzyklen durchzuführen, um ein den aktuellen Wickeldurchmesser WD darstellendes Eingangssignal zu erhalten, und auf den Wickelmotor (17) wirkt, um das abhängig von dem aktuellen Wickeldurchmesser WD anhand der Formel WT = WFtv * WD / 2 berechnete Wickelmoment WT zu modulieren, um die Wickelzugkraft WF auf einem zuvor festgelegten Zielwert Wftv zu halten,

wobei der Hauptprozessor (CPU) darauf ausgelegt ist:

eine Abwickeldrehzahl n15 der Wickelrolle (15) zu erfassen;

eine Schleppdrehzahl n11 der Schleppwalze (11) zu erfassen;
und

den aktuellen Wickeldurchmesser WD auf Grundlage einer Wickeldrehzahl n15 der Wickelrolle (15) und einer Schleppdrehzahl n11 der Schleppwalze (11) anhand der folgenden Formel zu berechnen:

11. Textilmaschine nach Anspruch 12, die außerdem eine Abwickelantriebseinheit (4) umfasst, die darauf ausgelegt ist, ein Zuführmoment aufzubringen, das der Drehung der Zuführeinheit (2) um eine Abwickeldrehachse (X2) entgegenwirkt, wodurch eine Zuführzugkraft SF auf den Kettgarnen (3) zwischen der Schleppwalze (11) und der Zuführeinheit (2) zur Verfügung gestellt wird.

12. Textilmaschine nach Anspruch 11, die außerdem Folgendes umfasst:

eine elektronische Schleppsteuerung (14), mit der ein Schleppmotor (12) der Schleppwalze (11) ausgestattet ist, und die darauf ausgelegt ist, einen Schleppversorgungsstrom 112 des Schleppmotors (12) zu erfassen;

eine Schleppsteuerung (21), die darauf ausgelegt ist, ein Schleppmoment DT zu berechnen, das abhängig vom Schleppversorgungsstrom 112 auf die Schleppwalze (11) aufgebracht wird;

wobei der genannte Hauptprozessor (CPU) außerdem darauf ausgelegt ist, die Zuführzugkraft SF mit der folgenden Formel zu berechnen:

13. Textilmaschine nach Anspruch 11 oder 12, die außerdem einen Komparator umfasst, der darauf ausgelegt ist, die Zuführzugkraft SF mit einem Zielwert SFtv der Zuführzugkraft SF zu vergleichen, wobei der Hauptprozessor (CPU) außerdem auf Folgendes ausgelegt ist:

Steigerung der Zuführdrehzahl n2 wenn SF > SFtv;

Verringerung der Zuführdrehzahl n2 wenn SF< SFtv.

Revendications

1. Procédé d'enroulement contrôlé d'un produit textile (9) sur une machine textile, dans lequel :

des fils de chaîne (3) sont déroulés depuis une unité d'alimentation (2) et déplacés longitudinalement pour atteindre une zone d'entrelacement de filetages (8) ;

un produit textile (9) comprenant lesdits fils de chaîne (3) est formé au niveau de la zone d'entrelacement de filetages (8) ;

un rouleau d'entraînement (11) ayant un diamètre extérieur DD engage le produit textile (9) près de la zone d'entrelacement de filetages (8), et tourne à une vitesse de rotation d'entraînement n11 pour faire avancer le produit textile (9) vers au moins un enrouleur (15) ;

l'enrouleur (15) tourne sur un axe de rotation d'enroulement (X15) pour enrouler le produit textile (9) dans des bobines superposées respectivement (9a) chacune selon un diamètre d'enroulement instantané WD ;

un couple d'enroulement WT est appliqué à l'enrouleur (15) pour fournir une force de traction d'enroulement WF sur le produit textile (9) entre le rouleau d'entraînement (11) et l'enrouleur (15) ;

le procédé comprenant en outre :

moduler le couple d'enroulement WT pour maintenir la force de traction d'enroulement WF à une valeur cible souhaitée WFtv,

caractérisé en ce que la modulation du couple d'enroulement WT comprend des cycles de réglage d'enroulement répétés, chacun comprenant :

acquérir une vitesse de rotation d'enroulement n15 de l'enrouleur (15) ;

acquérir la vitesse de rotation d'entraînement n11 du rouleau d'entraînement (11) ;

détecter le diamètre d'enroulement instantané WD ; et

appliquer une valeur instantanée du couple d'enroulement WT calculée par la formule :

dans lequel, pendant un ou plusieurs desdits cycles de réglage d'enroulement,

la détection du diamètre d'enroulement instantané WD est effectuée en calculant le diamètre d'enroulement instantané WD par la formule :

2. Procédé selon la revendication 1, dans lequel la réitération du cycle de réglage d'enroulement a lieu à une fréquence comprise entre 1 Hz et 10 Hz.

3. Procédé selon une ou plusieurs des revendications précédentes, dans lequel au moins un cycle de réglage d'enroulement est réalisé pour chaque révolution de l'enrouleur (15) autour de l'axe de rotation d'enroulement (X15).

4. Procédé selon une ou plusieurs des revendications précédentes, dans lequel un changement contrôlé de la valeur cible WFtv de la force de traction d'enroulement WF survient pendant le fonctionnement de la machine textile (1).

5. Procédé selon une ou plusieurs des revendications précédentes, dans lequel la force de traction d'enroulement WF diminue progressivement tandis que le diamètre d'enroulement WD augmente, ou vice versa.

6. Procédé selon une ou plusieurs des revendications précédentes, dans lequel :

l'unité d'alimentation (2) tourne sur un axe de rotation de déroulement (X2) pour dérouler les fils de chaîne (3) qui se déplacent vers la zone d'entrelacement de filetages (8) ;

un couple d'alimentation ST est appliqué à l'unité d'alimentation (2) pour fournir une force de traction d'alimentation SF sur les fils de chaîne (3) entre le rouleau d'entraînement (11) et l'unité d'alimentation (2) ; et

un contrôle de la force de traction d'alimentation SF est réalisé pendant le fonctionnement de la machine textile (1) pour la maintenir à une valeur cible souhaitée SFtv.

7. Procédé selon la revendication 6, dans lequel le contrôle de la force de traction d'alimentation SF est réalisé en modulant une vitesse de rotation d'alimentation n2 de l'unité d'alimentation (2) pour maintenir la force de traction d'alimentation SF à la valeur cible SFtv.

8. Procédé selon la revendication 7, dans lequel la modulation de la vitesse de rotation d'alimentation n2 comprend des cycles de réglage d'alimentation, chacun comprenant :

acquérir un courant d'alimentation d'entraînement I12 du moteur d'entraînement (12) ;

calculer un couple d'entraînement DT appliqué au rouleau d'entraînement (11) comme fonction du courant d'alimentation d'entraînement 112 ;

calculer une valeur instantanée de la force de traction d'alimentation SF par la formule :

comparer la valeur instantanée de la force de traction d'alimentation SF à la valeur cible SFtv ;

augmenter la vitesse de rotation d'alimentation n2 lorsque SF > SFtv ;

diminuer la vitesse de rotation d'alimentation n2 lorsque SF < SFtv.

9. Procédé selon une ou plusieurs des revendications 6 à 8, dans lequel un changement contrôlé de la valeur cible SFtv de la force de traction d'alimentation SF survient pendant le fonctionnement de la machine textile (1).

10. Machine textile, comprenant

au moins une unité d'alimentation (2) configurée pour porter des fils de chaîne (3) ;

des dispositifs d'entrelacement de filetages agissant au niveau d'une zone d'entrelacement de filetages (8) pour produire un produit textile (9) par l'intermédiaire des fils de chaîne (3) alimentés depuis l'unité d'alimentation (2) ;

un rouleau d'entraînement (11) ayant un diamètre extérieure DD configuré pour engager le produit textile (9) près de la zone d'entrelacement de filetages (8), et le faire avancer loin de la zone d'entrelacement de filetages (8) ;

un enrouleur (15) configuré pour recevoir le produit textile (9) fait avancé par le rouleau d'entraînement (11) et pouvant être tourné sur un axe de rotation d'enroulement (X15) pour enrouler le produit textile (9) dans des bobines superposées respectivement (9a) chacune selon un diamètre d'enroulement instantané WD ;

un moteur d'enroulement (17) configuré pour appliquer un couple d'enroulement WT à l'enrouleur (15), à cause duquel une force de traction d'enroulement WF est appliquée au produit textile (9) entre le rouleau d'entraînement (11) et l'enrouleur (15) ;

un détecteur agissant sur l'enrouleur (15), le détecteur détectant le diamètre d'enroulement instantané WD du produit textile (9) enroulé sur l'enrouleur (15) ;

caractérisée en ce que le détecteur comprend une unité centrale de traitement (CPU) configurée pour faire fonctionner des cycles de réglage d'enroulement répétés pour recevoir un signal d'entrée représentatif du diamètre d'enroulement instantané WD et agissant sur le moteur d'enroulement (17) pour moduler le couple d'enroulement WT calculé comme fonction du diamètre d'enroulement instantané WD selon la formule WT = Wftv * WD / 2, pour maintenir la force de traction d'enroulement WF à une valeur cible prédéterminée Wftv,

dans laquelle ladite unité centrale de traitement (CPU) est configurée pour :

acquérir une vitesse de rotation d'enroulement n15 de l'enrouleur (15) ;

acquérir une vitesse de rotation d'entraînement n11 du rouleau d'entraînement (11) ;
et

calculer le diamètre d'enroulement instantané WD sur la base d'une vitesse de rotation d'enroulement n15 de l'enrouleur (15) et une vitesse de rotation d'entraînement n11 du rouleau d'entraînement (11), selon la formule :

11. Machine textile selon la revendication 12, comprenant en outre une unité d'entraînement de déroulement (4) configurée pour appliquer une rotation opposée au couple d'alimentation de l'unité d'alimentation (2) autour d'un axe de rotation de déroulement (X2), à cause de laquelle une force de traction d'alimentation SF est fournie sur les fils de chaîne (3) entre le rouleau d'entraînement (11) et l'unité d'alimentation (2).

12. Machine textile selon la revendication 11, comprenant en outre :

une unité de contrôle électronique d'entraînement (14) équipant un moteur d'entraînement (12) du rouleau d'entraînement (11) et configurée pour acquérir un courant d'alimentation d'entraînement I12 du moteur d'entraînement (12) ;

un contrôleur d'entraînement (21) configuré pour calculer un couple d'entraînement DT appliqué au rouleau d'entraînement (11) comme fonction du courant d'alimentation d'entraînement 112 ;

dans laquelle ladite unité centrale de traitement (CPU) est configurée en outre pour calculer la force de traction d'alimentation SF par la formule :

13. Machine textile selon la revendication 11 ou 12, comprenant en outre un comparateur configuré pour comparer la force de traction d'alimentation SF à une valeur cible SFtv de la force de traction d'alimentation SF, dans laquelle l'unité centrale de traitement (CPU) est en outre configurée pour :

augmenter la vitesse de rotation d'alimentation n2 lorsque SF > SFtv ;

diminuer la vitesse de rotation d'alimentation n2 lorsque SF < SFtv.

Drawing