JP5723436B1 - Web intermittent transfer method and intermittent transfer apparatus - Google Patents

Abstract

A web is intermittently conveyed while applying a uniform tension in a low load state. In the process of continuously feeding and feeding a web W, the tension of the web W is detected by the displacement of the dancer roller 5, and the tension is adjusted by operating the feed amount of the web W according to the detection result. Furthermore, the tension of the web W fed from the dancer roller 5 is detected by the tension detector 26 before the accumulator 6, and the web W feed amount obtained from the displacement of the dancer roller 5 and the detection result detected before the accumulator 6 are detected. Then, the web W is intermittently sent to the processing step while adjusting the tension to the target value by operating the web drawing amount and the feeding amount by the accumulator 6. Processing is performed in a state where the web W is nipped by the nip roller 37 on the downstream side of the processing step, and after the processing is completed, the driving roller 37a constituting the nip roller 37 is operated to send the web W to the winding unit 3. The web W is wound up in synchronization with the web feed. [Selection] Figure 1

Description

  The present invention relates to an intermittent conveyance method and an intermittent conveyance device for a web that are processed while intermittently conveying a long web such as an adhesive tape, an optical film, and a resin film.

  In the process of conveying a long web, a constant tension is applied to the web in order to prevent wrinkles and slack, change in thickness, and meandering. For example, in the process of transporting a long green sheet, the tension of the web is detected by the tension detecting means, and the detection result is compared with the target tension. When a deviation occurs as a result of the comparison, the dancer roller is displaced to absorb the tension variation, and a constant tension is applied to the web (see Patent Document 1).

Japanese Patent Laid-Open No. 2001-213557

  The conventional intermittent conveyance method has the following problems. That is, the web that is continuously fed from the raw fabric roll is stretched and wrinkled until it is conveyed to the processing step, although the tension is adjusted to be constant by the dancer roller on the upstream side. It has been found by the inventors' diligent examination that the cause is the influence of the tension acting on the web unnecessarily due to the friction by the guide roller or the web pulling operation by the accumulator roller. In addition, when sending the web stored by the accumulator roller to the machining process, it was found that the web may not be machined accurately in the machining process due to slack and wrinkles due to insufficient tension acting on the web. .

  The present invention has been made in view of such circumstances, and includes an intermittent web transport method and an intermittent transport device capable of maintaining a constant amount of web that is intermittently transported and a tension acting on the web. The main purpose is to provide.

  In order to achieve such an object, the present invention has the following configuration.

That is, in accordance with a predetermined process to a long web, the web intermittently conveying method for intermittently conveying the web,
A feeding process for continuously feeding the web;
A first detection step of detecting the tension of the web by the displacement of the dancer roller;
A first tension adjusting process for adjusting the tension by manipulating the web feed amount according to the detection result of the first detecting process;
A second detection step of detecting the tension of the web fed from the dancer roller by a detector before the accumulator;
According to the web feed amount operated in the first tension adjustment process and the detection result of the second detection process, the web is processed while adjusting the tension to the target value by operating the web pull-in amount and feed amount by the accumulator. A second tension adjustment process intermittently sent to the process;
A holding process of holding the web on the downstream side of the machining process in synchronization with the start of drawing of the web by the accumulator;
A winding process for winding the web in synchronism with the feeding of the web by the accumulator;
It is provided with.

  (Operation / Effect) According to this method, by adjusting the tension of the web fed from the web supply unit to be constant by the dancer roller, the web having the tension adjusted to be constant can be sent out to the accumulator. In addition, when the tension is detected before the accumulator and a change in the tension adjusted by the dancer roller is detected, the tension is kept constant by operating the web pull-in amount and the feed amount by the accumulator while considering the change amount. The web can be intermittently sent out to the machining process as it is. In addition, the processed web can be wound and collected while maintaining a constant tension. Therefore, the web can be processed and manufactured with high quality.

  In the above method, in the second tension adjusting process, it is preferable that the web is drawn and fed out in a non-contact manner while gas is blown onto the web by an accumulator.

  According to this method, the web can be sent to the machining process in a state where unnecessary tension acting on the web is removed by the frictional resistance with the roller.

  Moreover, in the said method, it is preferable to hold | maintain a web in the downstream of a process with high priority among the some processing processes downstream from an accumulator.

  According to this method, the web can be kept in a non-contact state from the accumulator to the downstream position beyond the high priority processing step. Therefore, the web can be processed by a high priority processing step while maintaining the web tension adjusted by the accumulator.

  The present invention has the following configuration in order to achieve such an object.

That is, in accordance with a predetermined processing on a long web, an intermittent web transport device that intermittently transports the web,
A web supply unit for continuously supplying the web;
A dancer roller for detecting the tension of the web fed from the web supply unit;
An accumulator that intermittently feeds the web that is continuously fed from the web supply unit to a downstream processing step;
A detector for detecting the tension of the web fed from the dancer roller before the accumulator;
A holding mechanism for holding the web in synchronization with the intermittent feed of the web downstream of the processing step;
A winding unit for winding the web after processing;
According to the detection result of the dancer roller, the web feeding amount from the web supply unit is adjusted to adjust the tension, and the web by the accumulator is adjusted according to the web feeding amount of the web supply unit and the detection result of the detector. A controller that intermittently feeds the web to the machining process while adjusting the tension to the target value by operating the pulling amount and the feeding amount of
It is provided with.

  (Operation / Effect) According to this configuration, the control unit operates the web feed amount from the web supply unit to adjust the tension according to the detection result of the dancer roller, and the web feed amount of the web supply unit. According to the detection result of the detector and the web, the web is intermittently sent to the processing step while adjusting the tension to the target value by manipulating the web drawing amount and the feeding amount by the accumulator. Can do.

  In the above configuration, it is preferable that the accumulator is drawn and fed out in a non-contact manner while blowing gas onto the web.

  According to this configuration, the web can be brought into a non-contact state between the accumulator and the processing step. Therefore, the web can be processed while maintaining the tension of the web adjusted by the accumulator.

  According to the intermittent web conveyance method and intermittent conveyance device of the present invention, the web whose tension is adjusted to be constant by the accumulator immediately before the machining process can be intermittently sent to the machining process, so that the web is processed with high accuracy. can do.

It is a front view which shows the whole structure of an intermittent conveyance apparatus. It is a front view of the principal part of a web supply part. It is a control block diagram of an intermittent conveyance apparatus. It is a front view explaining operation | movement of an intermittent conveyance apparatus. It is a front view which shows the whole structure of a modification apparatus. It is a front view of the principal part of the web supply part in a modification apparatus. It is a front view explaining operation | movement of a modification apparatus.

  Embodiments of the intermittent web conveying apparatus of the present invention will be described below with reference to the drawings. In addition, an Example demonstrates taking the intermittent conveyance apparatus in the case of manufacturing an adhesive tape as an example.

  FIG. 1 is a front view showing an overall configuration of an intermittent transfer device according to an embodiment of the present invention.

  As shown in FIG. 1, the intermittent conveyance device is roughly composed of a web supply unit 1, a processing device 2, and a winding unit 3. Hereinafter, the configuration of each unit and apparatus will be specifically described.

  As shown in FIGS. 2 and 3, the web supply unit 1 includes a web supply mechanism 4, a dancer roller 5, and an accumulator 6.

  The web supply mechanism 4 unwinds the web W from the raw roll loaded on the winding shaft 7 via the bobbin. That is, the web W is fed out in conjunction with the rotation operation of the motor 10 connected to the winding shaft 7. In addition, the web supply mechanism 4 includes an encoder 11 that detects the number of rotations of the motor 10.

  The dancer roller 5 is disposed between a pair of guide rollers G1 and G2 that are horizontally disposed before and after the web W in the conveying direction. The dancer roller 5 is attached to the tip of the swing arm 12 so as to draw a web W having a preset length downward.

  The swing arm 12 maintains a vertical posture in a non-operating state. Further, the rotation shaft 14 of the swing arm 12 is configured such that torque can be set appropriately by an electromagnetic brake or the like. An encoder 15 is mounted on the bearing side of the rotating shaft 14. That is, the encoder 15 detects the swing angles θ1 and θ2 of the swing arm 12 that swings due to the frictional resistance between the web W wound around the dancer roller 5 and the dancer roller 5. The detection signal is transmitted to the control unit 60 described later.

  The accumulator 6 is configured by an accumulator roller 20 that moves up and down between a pair of guide rollers G3 and G4 arranged horizontally in the front and rear direction of the web W. The accumulator roller 20 is rotatably supported by a movable base that moves up and down on the ball shaft connected to the motor 24 at both ends of the rotation shaft. The accumulator roller 20 is rotatably supported on the movable table.

  A tension detector 26 is attached to the upstream guide roller G3. The tension detector 26 detects a load acting on the guide roller G3 as the web W passes, for example. The detection signal is transmitted to the control unit 60 described later.

  The processing device 2 includes, for example, a pretreatment process 30, a coating process 31, a drying process 32, an inspection process 33, and the like.

  In the pretreatment step 30, for example, ion wind is blown onto the web W by an ionizer or the like to remove static electricity or to remove dust adhering to the front and back surfaces of the web W.

  In the applying step 31, an adhesive is applied to at least one surface of the web W using, for example, a die coater, a comma coater, or a lip coater.

  The drying step 32 is configured by, for example, a box-shaped oven 34, and is appropriately dried while volatilizing an unnecessary solvent while passing the web W coated with an adhesive.

  The inspection step 13 inspects appearance defects such as voids generated on the surface of the web W by the sensor 35 such as an optical camera.

  Note that nip rollers 36 to 39 are arranged downstream of the pretreatment process 30, the application process 31, the drying process 32, and the inspection process 33, respectively. At least one of the nip rollers 36 to 39 moves up and down to nip the web W, and one of the rollers serves as a driving roller. That is, the nip rollers 36 to 39 are configured to nip the web W at the downstream side of the processing step during processing and to intermittently send the processed web W to the downstream side. The form in which the web W is held and sent downstream of each step is not limited to the nip rollers 36 to 39, and may be, for example, a suction roller. The nip rollers 36 to 39 and the suction roller correspond to the holding mechanism of the present invention.

  The winding unit 8 includes an accumulator 50, a dancer roller 51, and a winding mechanism 52 from the upstream side.

  The accumulator 50 has the same configuration as the accumulator 6 provided in the web supply unit 1. Therefore, it is comprised by the accumulation roller 53 which raises / lowers between a pair of guide rollers G5 and G6 horizontally arranged before and behind the conveyance direction of the web W. The accumulator roller 53 is rotatably supported by a movable base that moves up and down on a ball shaft connected to a driving mechanism such as a motor at both ends of the rotating shaft.

  The dancer roller 51 is disposed between a pair of guide rollers G7 and G8 that are horizontally disposed before and after the web W in the conveyance direction. The dancer roller 51 is attached to the tip of the swing arm 54 so as to draw a web W having a preset length downward.

  The take-up mechanism 52 takes up and collects the adhesive tape produced after the processing is completed on the bobbin loaded on the take-up shaft 55. That is, the web W is wound around the winding shaft 55 by a motor that operates in synchronization with the rotation of the motor 8 of the web supply mechanism 4. Further, the winding mechanism 4 is provided with an encoder for detecting the rotation of the motor.

  The control unit 60 uses the detection signals from the encoders 15, 11, 25, 44, the tension detector 26 and the sensor 35, and the tension of the web W intermittently conveyed between the web supply mechanism 1 and the winding device 8. Each mechanism is comprehensively controlled so that is constant. The control of each mechanism by the control unit 55 will be described in detail in the following description of the operation of the apparatus.

  Next, the web W is intermittently sent from the web supply unit 1 to each of the steps 30 to 34 of the processing device 2 by the above-described embodiment device, and the adhesive tape manufactured by the processing is wound up through the inspection step 34. A one-round operation of winding and collecting in the unit 3 will be described based on the description of FIGS.

  The initial setting of the apparatus is performed on the control unit 60 by operating the operation unit 70 shown in FIG. First, as shown in FIG. 3, the web supply unit 1 sets a tension (target value) to be applied to the web W fed out from the web supply mechanism 4. Based on the target value, the rotational speed of the motor 10 of the web supply unit 1 determined in advance for each characteristic of the web W is selected and set. Furthermore, the distance for raising and lowering the accumulator roller 20 is set according to the length of the web W processed in the processing step.

  In the processing apparatus 2, a processing step that requires processing accuracy is selected. In the present embodiment, in order to increase the processing accuracy of the web W in the coating process 31, an initial setting is performed for the nip roller 37 on the downstream side of the coating process 31. In accordance with the selection, the nip roller 37 is operated so that the web W is always nipped. In addition, the operation time, stop time, and speed within the operation time of the drive roller 37a constituting the nip roller 37 are set. The operation time and the stop time are appropriately set according to the processing time in the machining process. The speed setting within the operation time is set as follows, for example. In accordance with the take-up length of the web W, the drive roller 37a is gradually accelerated from the take-up start position to the end position of the web W, and is set to be gradually decelerated from the peak at the intermediate position and stopped. .

  In the winding unit 3, similarly to the web supply unit 1, the rotational speed (constant) of the motor 56 connected to the winding shaft 55 of the winding mechanism 52, the distance to raise and lower the accumulator roller 53, and the like are set. In addition, the raising / lowering speed of the accumulation roller 53 is substantially synchronized with the rotational speed of the driving roller 37a.

  When initialization is complete, the device is activated. Based on the initial setting, the controller 60 feeds the web W having a predetermined length in advance as shown in FIG. 4A, and then nips the web W by the nip roller 37 as shown in FIG. 4B. To do. Thereafter, the drive roller 37a, the motor 10, and the motor 56 are driven in synchronization.

  The drive roller 37a takes up the web W having a predetermined length while controlling the speed. On the other hand, the motor 10 continuously feeds out the web W from the original roll while rotating at a set speed. Further, the web W is wound around the winding shaft 55 at a constant speed by moving it up and down while changing the speed of the accumulating roller 53 in synchronization with the rotation of the driving roller 37a.

  Simultaneously with the operation of the apparatus, signals from the encoders 11, 25, 44 and the tension detector 26 are transmitted to the control unit 60.

  The control unit 60 performs control while monitoring whether or not the target value of the tension applied to the web W is maintained.

  First, the tension calculator 13 obtains an actual measurement value of the tension applied to the web W from the detection signal transmitted from the tension detector 26. That is. A change in tension acting on the web W according to a change in the load applied to the web W is obtained as correlation data determined in advance through experiments and simulations according to the characteristics of the web W and stored in a storage device such as a memory. Keep it. An actual measurement value is obtained from the load detected by the tension detector 26 and the correlation data. Further, the tension calculator 13 obtains a deviation from the target value and the actually measured value. Further, the tension calculator 13 monitors the change in the swing angle θ of the swing arm 12 detected from the encoder 15 and makes a swing angle by a torque command so that the actual measured value of the tension becomes the same as the target value. Is corrected linearly.

  The rotational speed of the motor 10 is adjusted according to a change in the swing angle θ obtained by the encoder 15 provided in the dancer roller 5. That is, the speed calculator 8 obtains the rotational speed of the motor 10 according to the actually measured value of the swing angle. For example, the speed calculator 8 stores the correlation data between the change in the swing angle and the change in the rotational speed in a storage device such as a memory in advance, and responds to the actual measurement value of the swing angle transmitted linearly from the encoder 15. Obtain the rotation speed (theoretical value). Further, the speed calculator 8 obtains a deviation between the actually measured value and the theoretical value of the rotational speed at that time, and transmits a correction command for the deviation to the motor driver 9. The motor driver 9 linearly corrects the rotational speed while monitoring the rotational speed detected from the encoder 11.

  The position calculator 21 of the control unit 60 obtains the position of the accumulator roller 20 that moves up and down within a predetermined range from the rotation angle of the encoder 25.

  A speed calculator 22 calculates the lifting speed of the accumulator roller 20. That is, the rotation angle of the motor 10 of the web supply mechanism 4 and the winding length of the web of the winding unit 3 are input, and the lifting speed of the accumulator roller 20 is controlled in synchronization with these. Specifically, by the synchronous control, the rotational speed of the motor 10 and the feed speed of the web W to the take-up unit 3 so that the movement amount of the accumulator 20 = (web take-up amount−web feed amount) / 2. To follow. The motor driver 23 linearly controls the ascending / descending speed of the accumulator roller 20 while monitoring the rotation angle of the encoder 25.

  Therefore, the controller 60 stops the web W in the coating process so that the predetermined process is performed in the coating process. In the meantime, the accumulator roller 20 of the accumulator 6 descends to a predetermined height while being controlled in speed, as indicated by the alternate long and short dash line in FIG. At this time, the rotational speed of the motor 10 is a value that corrects not only the tension that changes by the dancer roller 5 but also the tension that changes as the accumulator roller 20 moves up and down.

  While the web W is being processed, the downstream winding unit 3 winds the web W in synchronization with the rotation speed of the winding shaft while adjusting the tension of the web W stored by the accumulator 50. That is, while the rotational speed of the motor 56 connected to the take-up shaft 55 is kept constant, the accumulator 50 performs tension based on the raising / lowering position of the accumulation roller 53, the raising / lowering speed, and the swing angle of the tension detector 57 and the dancer roller 51. Adjust. The take-up shaft 55 takes up the processed adhesive tape whose tension has been adjusted.

  Next, when the processing from the web W to the adhesive tape is completed in the coating step 31, the position information (length) of the adhesive tape taken after the processing, obtained by the position calculator 40 using the rotation angle of the encoder 44. ) And the rotation angle of the motor 10 of the web supply mechanism 4 are input to the speed calculator 22 for the accumulator. The speed calculator 22 calculates an optimum speed for raising the accumulation roller 20 based on the length and rotation angle of the adhesive tape.

  That is, the control unit 60 causes the drive roller 37a to feed the adhesive tape to the winding unit 3, and raises the accumulation roller 20 in synchronization with the rotational speed of the drive roller 37a.

  At this time, the winding unit 3 stores the adhesive tape having a predetermined length suitable for being sent out to the winding mechanism 53 within the processing time of the web W by the lowering of the accumulating roller 50.

  By repeating the above-described intermittent operation, a single operation of intermittently conveying the web W in the process of manufacturing the adhesive tape is completed.

  According to the above-described embodiment apparatus, the tension of the web W changed by the dancer roller 5 and the tension changed by the raising / lowering of the accumulator roller 20 are corrected and corrected to a preset target value of the tension. Therefore, the low-tensile web W having a small deviation from the target value can be intermittently conveyed and supplied to a processing apparatus provided immediately after the accumulator 6. Therefore, since it can process without generating elongation, slack, wrinkles and the like on the web W, a processed product such as a high-quality adhesive tape can be manufactured.

  The present invention can also be implemented in the following forms.

  (1) In the above-described embodiment apparatus, for example, among the guide rollers G2 to G6 arranged horizontally before and after the accumulator roller, the downstream side G2, G4 and the accumulator rollers 13, 24 are configured as an air dancer in which the air turn bar is replaced. Also good.

  That is, as shown in FIGS. 5 and 6, the air turn bars 80 and 81 have a semicircular or semi-elliptical cross-sectional shape. A plurality of holes are formed in the peripheral surfaces of the air turn bars 80 and 81, and compressed air supplied from an external compressor is discharged from the holes with an equal pressure. Therefore, the web W is conveyed on the air turn bars 80 and 81 in a non-contact manner.

  According to this configuration, the web W does not come into contact with the accumulation roller 20 and the guide roller G2 as in the main embodiment, so that the frictional resistance does not act on the web W whose tension has been adjusted. Therefore, the tension-adjusted web W can be conveyed intermittently with high accuracy by the machining process.

  (2) In each of the above embodiments, as shown in FIGS. 7A and 7B, a configuration may be provided in which a dancer roller 90 and an accumulator 91 are provided between the processing apparatus 2A and the processing apparatus 2B. . In the case of this configuration, each of the accumulator rollers 20, 92, 53 is lowered at the same timing by synchronizing the accumulator rollers of the processing apparatus 2A and the take-up mechanism 24, for example. What is necessary is just to carry out movement control so that the accumulation roller 92 in the meantime may be raised. Note that the number of the combination of the dancer roller and the accumulator can be appropriately set and changed according to various conditions such as the number of processing steps and a step requiring processing accuracy.

  (3) In the above embodiments, the processing times of the steps 36 to 39 are the same, but the processing times may be appropriately changed. In this case, for example, the conveyance distance of the web W between adjacent processes may be changed as appropriate. For example, it can be adjusted by the pull-in amount of the web W by the dancer roller or the accumulator roller.

  (4) In addition, although the said Example demonstrated the intermittent conveyance in the case of manufacturing an adhesive tape, the target object intermittently conveyed is not limited to an adhesive tape. For example, various webs such as a deflection film and a high-functional film can be intermittently conveyed.

DESCRIPTION OF SYMBOLS 1 ... Web supply part 2 ... Processing apparatus 3 ... Winding part 4 ... Web supply mechanism 5 ... Dancer roller 6 ... Accumulator 10 ... Motor 11 ... Encoder 12 ... Swing arm 11 ... Encoder 20 ... Accumulation roller 26 ... Tension detector 36- 39 ... Nip roller 37a ... Drive roller 11 ... Encoder 60 ... No control W ... Web

Claims (5)

In accordance with a predetermined processing to a long web, an intermittent web transport method for intermittently transporting the web,
A feeding process for continuously feeding the web;
A first detection step of detecting the tension of the web by the displacement of the dancer roller;
A first tension adjusting process for adjusting the tension by manipulating the web feed amount according to the detection result of the first detecting process;
A second detection step of detecting the tension of the web fed from the dancer roller by a detector before the accumulator;
According to the web feed amount operated in the first tension adjustment process and the detection result of the second detection process, the web is processed while adjusting the tension to the target value by operating the web pull-in amount and feed amount by the accumulator. A second tension adjustment process intermittently sent to the process;
A holding process of holding the web on the downstream side of the machining process in synchronization with the start of drawing of the web by the accumulator;
A winding process for winding the web in synchronism with the feeding of the web by the accumulator;
A method for intermittently conveying a web, comprising: In the intermittent conveyance method of the web according to claim 1,
The second tension adjusting process is a method for intermittently conveying a web, wherein the web is drawn and fed out in a non-contact manner while blowing gas onto the web by an accumulator. In the intermittent conveyance method of the web according to claim 1 or 2,
The said holding | maintenance process hold | maintains a web downstream of the process with high priority among the some process steps downstream from an accumulator. The intermittent conveyance method of the web characterized by the above-mentioned. In accordance with a predetermined process to a long web, an intermittent web transfer device that intermittently conveys the web,
A web supply unit for continuously supplying the web;
A dancer roller for detecting the tension of the web fed from the web supply unit;
An accumulator that intermittently feeds the web that is continuously fed from the web supply unit to a downstream processing step;
A detector for detecting the tension of the web fed from the dancer roller before the accumulator;
A holding mechanism for holding the web in synchronization with the intermittent feed of the web downstream of the processing step;
A winding unit for winding the web after processing;
According to the detection result of the dancer roller, the web feed amount from the web supply unit is adjusted to adjust the tension, and according to the web feed amount of the web supply unit and the detection result of the detector, the web by the accumulator is adjusted. A controller that intermittently feeds the web to the machining process while adjusting the tension to the target value by operating the pull-in amount and the feed amount;
An intermittent web conveying apparatus comprising: In the intermittent conveyance apparatus of the web according to claim 4,
The accumulator is provided with an intermittent web feeding device, characterized in that the accumulator includes a non-contact drawing and feeding out while blowing gas onto the web.

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