JP5234280B2 - Tension device in filament winding device - Google Patents

Description

  The present invention relates to a tension device in a filament winding device, and more particularly to a tension device using a transport belt as a tension adjusting element.

  In this type of filament winding apparatus (hereinafter simply referred to as a winding apparatus), a tension device applies a predetermined tension to the yarn and feeds it to the mandrel. As this type of tension device, a dancer roller system and a nip system are generally used. The former structure can be seen in, for example, Patent Document 1, and the latter structure can be found in, for example, Patent Document 2.

  In the present invention, the tension of the yarn is adjusted by using the conveyor belt as an adjustment element. This type of tension device can be found in Patent Document 3. There, a pair of upper and lower belts that sandwich the wire (electric cable) from above and below, a pair of left and right belt pulleys that support the belt in an oval shape, and a motor that drives one belt pulley of the lower belt The tension device is composed of A rotary encoder is attached to the motor, and the current change of the motor in a no-load state where the filament is not clamped between the upper and lower belts is stored in advance for each rotary encoder pulse period until the belt makes one revolution. Keep it. By driving the motor by adding the drive current value when the filament is fed at a constant tension to the current value in the no-load state, the dynamic drive force variation of the take-up device is corrected to correct the filament. The body can be fed with a certain tension.

  In the present invention, a conveyor belt and a torque roller are used as the tension adjusting element, but the torque roller is well known and can be found in, for example, Patent Document 4. In this case, the torque roller is made to function as a torque limiter to prevent excessive torque from being output.

Japanese Patent Laying-Open No. 2004-188869 (paragraph number 0025, FIG. 1) JP 05-338044 (paragraph number 0025, FIG. 7) JP-A-60-223769 (2nd page, lower right column, lines 5 to 16, line 3) Japanese Utility Model Publication No. 05-43311 (page 3, column 6, lines 14-31, FIG. 1)

  The dancer roller device has a simple structure as a whole, but has the following problems. It is necessary to secure a large space for arranging at least two guide rollers and dancer rollers in the yarn supply path. Since the yarn is greatly bent at each roller, the yarn is easily damaged when the tension is large. Furthermore, it is difficult to automate the work for passing the yarn to each roller. Since the dancer roller is displaced to adjust the tension, there is a problem that a response delay is likely to occur as the yarn supply speed increases.

  In addition, the tension device with a nip structure requires less space than the tension device with a dancer roller structure, but the yarn is strongly squeezed and easily damaged, and a large tension is applied to the yarn. In addition, problems such as generation of fluff are generated. In particular, in the case of a yarn formed of carbon fiber, a portion of the yarn may be cut by strong squeezing, which is problematic in improving the quality of the wound molded product.

  In that respect, according to the tension device of Patent Document 3, since the linear body is clamped by a pair of upper and lower belts arranged in parallel, the predetermined tension is applied by clamping the upper and lower belts without bending the yarn. it can. While passing through the tension device, the striatum is squeezed and fluff does not occur. However, since the linear member is held up and down at the linear transition portion of the conveyor belt, there is no problem when the tension of the linear member is small, but when the tension exceeds a certain value, the linear member and the belt There is a risk of slipping between them. There is also a disadvantage that the straight transition portion of the conveyor belt is deformed in the belt thickness direction and the tension is likely to fluctuate. In addition, it takes time and effort to pass the filaments between the belts.

  It is an object of the present invention to accurately apply tension without causing slippage on the yarn, and to eliminate the fact that the yarn is crushed and damaged in the process of applying the tension. An object of the present invention is to provide a tension device in a winding device that can improve quality. An object of the present invention is to provide a tension device in a filament winding apparatus that can be configured more compactly than a tension device having a dancer roller structure and that can automatically set a yarn to the tension device.

The tension device according to the present invention applies a predetermined tension to the yarn fed from the yarn supply source to the mandrel. The tension device includes a first clamping structure and a second clamping structure that are arranged to face each other with the yarn feeding path interposed therebetween. The first clamping structure includes a plurality of belt pulleys, a conveyor belt wound around the belt pulley, and a torque adjustment structure that regulates the transfer torque of the conveyor belt to a predetermined value. The torque adjustment structure is composed of a nip pressure applying body that applies frictional resistance to the conveyor belt. Therefore, the yarn passing through the tension device is guided to be transferred in a state of being held in a waveform by the conveyance belt having the first holding structure and the second holding structure, and a predetermined tension is applied to the yarn. And

  A threading structure is provided that displaces at least one of the first clamping structure and the second clamping structure between the operating position and the retracted position. The yarn can be automatically threaded in a state where at least one of the first and second clamping structures is displaced to the retracted position by the threading structure.

  The belt pulley is composed of a torque roller that also serves as a torque adjustment structure.

  A 2nd clamping structure comprises one or more clamping rollers pressed toward a conveyance belt between adjacent belt pulleys.

  The second clamping structure includes a plurality of clamping pulleys that are freely supported and an endless clamping belt that is wound around the clamping pulleys.

  In the present invention, the yarn is pinched in a waveform by the conveyance belt and the second pinching structure, and further, the movement of the conveyance belt is braked by the torque adjustment structure so that a predetermined tension is applied to the yarn. Tension can be applied while reliably preventing the yarn from slipping. In addition, since the yarn passing through the tension device moves along with the transport belt and the second clamping structure, the yarn is not crushed and damaged in the process of applying tension, and the quality of the wound molded product is improved. Can be achieved. Further, the tension device can be made sufficiently compact and the installation space can be reduced as compared with a tension device having a conventional dancer roller structure.

  When at least one of the first and second sandwiching structures can be displaced between the operating position and the retracted position in the threading structure, the both sandwiching structures are in a state in which the sandwiching structure is displaced to the retracted position. A free space can be formed between the yarns, and the yarn can be automatically threaded along this space. Accordingly, it is possible to quickly perform the threading operation at the time of changing the setting such as changing the type of the yarn, and the winding molded product can be produced efficiently.

  If the belt pulley is configured with a torque roller and the belt pulley itself also serves as a torque adjustment structure, the overall structure of the tension device is simplified and more compact than when a dedicated torque adjustment structure is provided separately. Installation space can be reduced. There is also an advantage that the tension acting on the yarn can be increased according to the number of belt pulleys used.

  If the belt pulley, the conveyor belt, and the torque adjustment structure constitute the first clamping structure, and the torque adjustment structure is constituted by the nip pressure applying body, the structure of the belt pulley is compared to the case where the belt pulley is constituted by the torque roller. Can be simplified and the cost can be reduced. In addition, since the tension acting on the yarn can be freely adjusted by changing the clamping pressure of the conveying belt by the nip pressure applying body, the tension can be quickly changed according to the yarn to be used.

  If the second clamping structure is composed of one or more clamping rollers, the structure of the second clamping structure can be simplified and the tension device can be reduced in cost. As the structure is simple, the possibility of failure of the second clamping structure can be minimized and the reliability can be improved.

  When the second sandwiching structure is constituted by a plurality of sandwiching pulleys supported in a freely swingable manner and an endless sandwiching belt wound around the sandwiching pulleys, the first sandwiching structure of the transport belt and the sandwiching belt forms a thread shape. Can be held in a continuous wave form from above and below. Therefore, the contact length between both belts and the yarn can be made sufficiently large to prevent the yarn from slipping when the yarn passes through the tension device.

It is a front view of the tension device concerning the present invention. It is a schematic perspective view of a winding apparatus. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is a front view of the tension device of the state which operated the 2nd clamping structure to the standby position. It is a front view which shows another Example of a tension apparatus. It is a front view which shows another Example of a tension apparatus.

  1 to 5 show an embodiment of a tension device according to the present invention. In FIG. 2, the winding device is disposed between the yarn supply source including the bobbin 1, a drive mechanism (not shown) that traverses the mandrel M while rotating the mandrel M, and the yarn supply structure and the mandrel M. It consists of a tension device etc. The yarn Y is formed by aligning a group of carbon fibers in a belt shape, and is impregnated with a thermosetting molten resin while passing through an impregnation apparatus (not shown). Is helically wound around the mandrel M.

  As shown in FIG. 1, the tension device includes a first clamping structure 2 disposed on the lower side of the yarn Y feeding path, a second clamping structure 3 disposed on the upper side, and both clamping structures 2 and 3. The base 4 that supports the thread and the second pinching structure 3 are constituted by a threading structure that moves up and down. The first clamping structure 2 is wound around two belt pulleys 5 and 5, a guide pulley 6 disposed at a lower center portion between both pulleys 5 and 5, and these three pulleys 5, 5, and 6. The conveyor belt 7 and a torque adjustment structure that regulates the transition torque of the conveyor belt 7 to a predetermined value are used.

  The belt pulleys 5 and 5 are composed of torque rollers that also serve as a torque adjustment structure. As shown in FIG. 4, the magnetic pulley (not shown) is interposed between the pulley shaft 8 fixed to the base 4 and the pulley body 9. A transmission body and a planetary gear mechanism are arranged. The magnetic transmission body is composed of a permanent magnet and an iron plate that are opposed to each other through a small gap, and a transfer torque that exceeds the attraction force between the permanent magnet and the iron plate and the rotational resistance of the planetary gear mechanism is applied to the conveyor belt 7. Only after the operation, the pulley body 9 rotates along with the conveyor belt 7. Therefore, a tension corresponding to the rotational resistance of the pulley body 9 is applied to the thread Y. The conveyor belt 7 is made of a rubber or plastic flat belt, and its circumferential length is set longer than the shortest circumferential length when the conveyor belt is wound around the three pulleys 5, 5, 6. The guide pulley 6 is rotatably supported by a pulley shaft 10 fixed to the base 4 via a bearing 11.

  The second clamping structure 3 includes a clamping roller 13, a roller shaft 14 that rotatably supports the clamping roller 13, a bearing 15 (see FIG. 3), and the like. 1) and a standby position (state shown in FIG. 5). Therefore, a guide groove 16 that allows the roller shaft 14 to slide up and down is formed in the base 4, and the roller shaft 14 is fixed to a support shaft block 17 that is slidably guided by the guide groove 16. The threading structure is configured using a fluid pressure cylinder (not shown) as a drive source, and the second support structure 3 is moved up and down by operating the support shaft block 17 up and down.

  In the state where the second clamping structure 3 is lifted to the standby position with the threading structure, as shown in FIG. 5, the clamping roller 13 is separated from the first clamping structure 2, and the clamping roller 13 and the belt pulleys 5 and 5 Since there is a large gap between them, the yarn Y can be automatically threaded. The conveyor belt 7 in this state is in a relaxed state. However, as shown in FIG. 1, when the second holding structure 3 is lowered to the operating position by the thread passing structure, the holding roller 13 is moved through the yarn Y at the center portion of the left and right belt pulleys 5 and 5. 7 and at the same time, the conveying belt 7 is held in a moderately tensioned state.

  As described above, the yarn Y that is clamped up and down by the clamping roller 13 and the conveyor belt 7 is held in a waveform between the left and right belt pulleys 5 and 5 and is in close contact with the outer surface of the conveyor belt 7. Specifically, the yarn Y is formed on the outer side of the circumferential surface of the belt pulley 5 positioned on the upstream side in the conveying direction, on the outer side of the circumferential surface of the sandwiching roller 13, and on the downstream side in the conveying direction of the belt pulley 5. It is curved at three locations on the outer side of the peripheral surface and is in close contact with the outer surface of the conveyor belt 7.

  As described above, by pinching the yarn Y in the waveform, the contact length between the yarn Y and the transport belt 7 when passing through the tension device is sufficiently secured, and the yarn Y and the transport belt 7 It is possible to reliably prevent slippage between the two. In addition, since the conveyor belt 7 is curved at three locations, it is possible to prevent the tension from fluctuating even when the linear transition portion between the belt pulleys 5 and 5 and the clamping roller 13 is deformed in the belt thickness direction. . Therefore, according to the tension device configured as described above, the tension acting on the yarn-like Y can always be kept constant.

  Further, by eliminating the slip between the yarn Y and the conveyor belt 7, the yarn Y passing through the tension device can be wiped out and damaged and the quality of the wound molded product can be improved. . Furthermore, the tension device can be configured in a compact configuration as compared with a conventional dancer roller structure tension device to save space, and can be arranged along the feed path of the yarn Y. When the supply of the yarn Y to the mandrel M is stopped, the conveyor belt 7 and the belt pulley 5 are immediately stopped.

  FIG. 6 shows another embodiment of the tension device according to the present invention. There, the first clamping structure 2 includes three belt pulleys 5, 5, 5, two guide pulleys 6, 6 disposed on both lower sides of these pulleys 5, 5, 5, and these five The conveyor belt 7 wound around the pulleys 5 and 6 and a torque adjusting structure are included. Each belt pulley 5 is composed of a torque roller that also serves as a torque adjustment structure, as in the previous embodiment.

  The second sandwiching structure 3 includes two sandwiching pulleys 20 and 20 and a guide pulley 21 that are supported so as to be freely rotatable, an endless sandwiching belt 22 wound around these pulleys 20 and 21, and each pulley. It consists of the frame 23 etc. which support 20 * 21. By moving the frame 23 up and down with a threading structure, the second clamping structure 3 can be displaced to the operating position shown in FIG. 6 and the standby position above the operating position, and the threading is automatically performed at the standby position. it can. The left and right clamping pulleys 20, 20 in the operating position enter between the three belt pulleys 5, 5, 5 of the first clamping structure 2, whereby the yarn Y passing through the tension device is transferred to the transport belt 7. And the sandwiching belt 22 can be held in a continuous waveform.

  As described above, when the conveyance belt 7 is guided to be transferred by the three belt pulleys 5, the contact length between the yarn Y and the conveyance belt 7 when passing through the tension device can be increased, and the conveyance belt 7 is nipped by the nipping belt 22. The contact length of the yarn Y can be increased by the amount. Therefore, it is possible to reliably prevent slippage between the yarn Y and the conveyor belt 7 and further stabilize the tension acting on the yarn Y. Further, since the transfer belt 7 is guided to be transferred by the three belt pulleys 5 formed of torque rollers, a larger tension can be applied to the thread Y as the number of the belt pulleys 5 used is increased. Since others are the same as the previous embodiment, the same reference numerals are assigned to the same members, and descriptions thereof are omitted. The same applies to the following embodiments.

  In the tension device shown in FIG. 7, as with the first clamping structure 2 in FIG. 6, three belt pulleys 25, 25, and 25, and two pieces of pulleys arranged on both lower sides of these pulleys 25, 25, and 25, It comprises guide pulleys 6 and 6, a conveyor belt 7 wound around these five pulleys 25 and 6, and a torque adjustment structure. Each belt pulley 25 is rotatably supported by a pulley shaft 26 fixed to the base 4. The torque adjustment structure is composed of a pair of upper and lower bowl-shaped nip pressure applying bodies 27 and 28, and the lower side nip pressure applying body 27 and the upper nip pressure applying body 28 hold the transport belt 7 up and down. Thus, friction resistance is applied to the conveyor belt 7. The lower nip pressure applying body 27 is fixed to the base 4 and receives the conveying belt 7, and the upper nip pressure applying body 28 is connected to the lower nip pressure applying body 27 via the conveying belt 7. It is pressed by pressing force. When the pressing force of the nip pressure applying body 28 is adjusted with the adjusting screw, the tension applied to the yarn Y can be adjusted to be large or small. The second clamping structure 3 is configured by pivotally supporting a pair of left and right clamping rollers 13 by a roller shaft 13 fixed to a frame 23 so as to be freely rotatable.

  As described above, when friction resistance is applied to the conveying belt 7 by the nip pressure applying bodies 27 and 28, a tension corresponding to the previous friction resistance can be applied to the yarn Y that passes through the tension device. Moreover, since the contact length between the yarn Y and the conveyor belt 7 can be increased similarly to the tension device of FIG. 6, it is possible to reliably prevent slippage between the yarn Y and the conveyor belt 7, The tension acting on the thread Y can always be stabilized.

  In the above embodiment, the torque roller provided with the magnetic transmission body and the planetary gear mechanism has been described. However, it is not necessary, and a torque roller using a spring or a brake shoe as a braking element may be used. Further, in place of the second clamping structure 3, the first clamping structure 2 can be displaced between the operating position and the retracted position with a threading structure, and if necessary, both the first and second clamping structures can be operated. 2 and 3 may be displaced by a threading structure at the same time. The belt pulleys 5 and 25 can be rotationally driven in the same direction as the conveyance of the yarn Y at a predetermined speed to apply tension to the yarn Y. The conveyor belt 7 need not be a flat belt, but can be a timing belt having a flat outer peripheral surface. In that case, the pulley body 9 of the belt pulley 5 may be constituted by a timing pulley.

2 1st clamping structure 3 2nd clamping structure 5 belt pulley 7 conveyance belt 13 clamping roller 20 clamping pulley 22 clamping belt 25 belt pulley Y thread

Claims (5)

A tension device that applies a predetermined tension to a yarn fed from a yarn supply source to a mandrel,
The tension device is composed of a first clamping structure and a second clamping structure that are opposed to each other with the yarn feeding path interposed therebetween,
The first clamping structure includes a plurality of belt pulleys, a conveyance belt wound around the belt pulley, and a torque adjustment structure that regulates a transition torque of the conveyance belt to a predetermined value.
The torque adjustment structure is composed of a nip pressure imparting body that imparts frictional resistance to the conveyor belt,
The yarn passing through the tension device is transferred and guided in a state of being held in a waveform by the conveyance belt of the first holding structure and the second holding structure, and a predetermined tension is applied to the yarn. The tension device in the filament winding device characterized. A threading structure for operating at least one of the first clamping structure and the second clamping structure between an operating position and a retracted position;
The filament winding apparatus according to claim 1, wherein the yarn can be automatically threaded in a state in which at least one of the first and second sandwiching structures is displaced to the retracted position by the threading structure. Tension device.   The tension device in the filament winding apparatus according to claim 1 or 2, wherein the belt pulley is configured by a torque roller that also serves as the torque adjustment structure. The tension in the filament winding apparatus according to any one of claims 1 to 3, wherein the second clamping structure is constituted by one or more clamping rollers pressed against the conveyor belt between the adjacent belt pulleys. apparatus. The filament winding apparatus according to any one of claims 1 to 3 , wherein the second sandwiching structure includes a plurality of sandwiching pulleys that are rotatably supported and an endless sandwiching belt that is wound around the sandwiching pulleys. Tensioning device .

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