JP2018177457A - Transportation apparatus and transportation metho - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transportation apparatus and a transportation method capable of preventing slippage of a drive roller.SOLUTION: A transportation apparatus 10 is provided with a first transport section 20 where a tensile force T1 of a film 12 in a transport direction is controlled to 100 N and a second transport section 22 where a tensile force T2 of the film 12 in the transport direction is controlled to 200 N. Between the first and second transport sections 20, 22, a high-resistance follower roller 50 having a rotational resistance of 50 N and a drive roller 30 having a holding power of the film 12 of 60 N are provided. Since a tensile force T3 of the film 12 in the transport direction is given 150 N, the difference of tensile force between an upstream and a downstream of the drive roller 30 goes lower than the holding power 60 N of the drive roller 30, and prevents slippage of the drive roller 30.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a transfer device and a transfer method for transferring a long web.

  In the process of producing a long film (web) or in the process of producing a film roll by winding the produced long film into a roll for storage and / or transportation, The conveying apparatus which conveys is used. The transport device pulls the film toward the downstream side by the drive roller which is rotated by being supplied with a drive force from a drive power supply means such as a motor, and resists the film transport at the upstream side of the drive roller. Tension is given to the film to be conveyed by providing the film (see Patent Document 1 below).

  In addition, it may be required to divide the film transport section into a plurality of sections and to individually control the tension in each transport section. In such a case, a drive roller is added between each transport section, and for example, the first transport section, the first drive roller, the second transport section, the second drive roller in order from the upstream side of the film transport direction. Is provided. The first drive roller controls the tension of the film transported on the first transport section, and the second drive roller controls the tension of the film transported on the second transport section.

JP 2007-512197 A

  However, in the case where the film transport section is divided into a plurality of sections as described above, and the tension in each transport section is individually controlled, if the tension difference between the adjacent transport sections is large, placement between the adjacent transport sections in this way There is a problem that the drive roller thus slipped without being able to hold the film, and it became impossible to control the tension.

  In order to prevent this, it is conceivable to further divide the transport section further by adding a drive roller, and to change the tension stepwise in the range where it does not slip (see FIG. 3). There is a problem that the installation space is required to add rollers and control devices, and the cost increases.

  The present invention has been made in view of the above-mentioned background, and an object of the present invention is to provide a conveying device and a conveying method capable of preventing the slip of the driving roller while suppressing the cost.

  In order to solve the above-mentioned subject, the conveyance device of the present invention is the conveyance device which conveys a long web, and the 1st conveyance section where the tension of the conveyance direction of a web is controlled by the 1st tension, the 1st conveyance section Provided between the first and second transport sections, the second transport section being disposed further downstream in the transport direction than the first transport section and being controlled to a second tension greater than the first tension; A tension adjustment section controlled to an intermediate tension between the first tension and the second tension, and in the tension adjustment section, a web is wound around the outer periphery and a driving force is supplied by the driving force supply means Is driven by the drive roller that pulls the web by this rotation, and the web is wound around the outer periphery, and a rotational resistance is provided, and the movement of the web when the web is pulled by a force exceeding the rotational resistance Resistance driven low that rotates with When, is provided, at a tension adjustment section is one in which the tension between the driving roller and the high-resistance driven roller is controlled to an intermediate tension.

  It is desirable to provide asperities on the peripheral surface of the high resistance driven roller.

  The unevenness is preferably a groove formed on the peripheral surface of the high resistance driven roller.

  The grooves are preferably formed along the rotational direction of the high resistance driven roller.

  Of the circumferential surface of the high resistance driven roller, it is desirable that the angle at which the web is wound is 90 ° or more.

  It is preferable that a bearing for supporting the rotational shaft of the high resistance driven roller is provided, and the rotational resistance is generated by the bearing.

  It is desirable to adjust the magnitude of the rotational resistance by magnetic force.

  It is desirable to include a bearing for supporting the rotation shaft of the high resistance driven roller, and adjust the magnitude of the rotation resistance by adjusting the gripping force when the bearing grips the rotation shaft with a magnetic force.

  Further, according to the conveyance method of the present invention, in the conveyance method of conveying a long web, the first conveyance section in which the tension in the conveyance direction of the web is controlled to the first tension and the downstream of the first conveyance section in the conveyance direction. And a second conveyance section controlled to a second tension where the tension is greater than the first tension, and provided between the first conveyance section and the second conveyance section, wherein the tension is the first tension and the second tension The web is conveyed in each section divided into a tension adjustment section controlled to an intermediate tension between them, provided in the tension adjustment section, the web is wound around the outer periphery, and the driving force is supplied by the driving force supply means A drive roller which rotates by being supplied and which pulls the web by this rotation, is provided in a tension adjustment section, the web is wound around the outer periphery, and a rotational resistance is provided, with a traction force exceeding the rotational resistance. When the web is towed And a high-resistance driven roller that rotates with the movement of the web, by, and controls the tension between the driving roller and the high resistance driven roller to the middle tension.

  According to the present invention, the upstream or downstream side of the drive roller provided between the first transport section in which the web is transported with the first tension and the second transport section in which the web is transported with the second tension is high. The resistance driven roller is added, and the tension of the film (web) conveyed between the drive roller and the high resistance driven roller is set to an intermediate tension between the first tension and the second tension. And the slip of the drive roller provided between the second transport sections can be prevented. In addition, since the roller to be added is a high resistance driven roller, the installation space can be reduced and the cost can be reduced compared to the case where the roller to be added is a driving roller.

It is explanatory drawing of the conveying apparatus which implemented this invention. It is explanatory drawing of the conventional conveying apparatus. It is explanatory drawing of the conventional conveying apparatus. It is explanatory drawing of the conveying apparatus which implemented this invention.

  As shown in FIG. 1, an example of the transport apparatus 10 embodying the present invention is a film production facility for producing a long film (web) 12 or storing and / or producing the long film produced. The film 12 used in a film roll manufacturing facility for manufacturing a film roll by being wound up in a roll shape for transportation is transported to a post process 16 from the preprocess 14.

  The film 12 transported by the transport device 10 is, for example, an optical film such as a TAC (triacetyl cellulose) film. Further, in the present embodiment, an example in which only the film 12 is transported between the pre-process 14 and the post-process 16 is described, but the film 12 is dried in the process of transporting from the pre-process 14 to the post-process 16 The optical functional layer may be formed by applying and / or a polymer solution or the like.

  In the transport device 10, a first transport section 20 and a second transport section 22 are provided between the pre-process 14 and the post-process 16 sequentially from the upstream side of the transport direction of the film 12, and from the pre-process 14 The transported film 12 is transported to the post-process 16 via the first and second transport sections 20 and 22. A plurality of transport rollers 24 are provided between the pre-process 14 and the post-process 16, and the film 12 is wound around the transport rollers 24. The transport roller 24 is a driven roller, and is driven to rotate as the film 12 is transported.

  A drive roller 30 is provided downstream of the first conveyance section 20, and the film 12 is wound around the drive roller 30. The driving roller 30 is rotated by being supplied with a driving force from a driving force supply means such as a motor 32, and the film 12 is held by the frictional force with the wound film 12 to the downstream side in the transport direction. Tow. The rotational speed of the motor 32 is controlled by the first tension control unit 34. The first tension control unit 34 controls the tension of the film 12 conveyed in the first conveyance section 20 by controlling the motor 32. In the present embodiment, the tension in the transport direction of the film 12 transported in the first transport section 20 is such that the film 12 transported in the first transport section 20 is pulled in the transport direction by a force of 100 N. An example in which the motor 32 is controlled so that T1 (first tension) becomes 100 N will be described.

  Further, in the present embodiment, the moving roller 36 is provided between the first conveyance section 20 and the driving roller 30. The moving roller 36 has a circumferential surface in contact with the surface of the film 12, and a direction (a downward direction in FIG. 1) of increasing the tension T1 by increasing the pressing force for pressing the film 12 It is provided so as to be movable in the direction to lower the pressure and reduce the tension T1 (upward in FIG. 1), is controlled by the first tension control unit 34, and moves based on this control. The first tension control unit 34 adjusts the tension T1 so that the tension T1 becomes 100 N by moving the moving roller 36. In addition, control of tension T1 is also possible by measuring tension with a tension meter and controlling the speed of the rotation drive roller 30 (motor 32) based on the value, and the rotation drive roller 30 (motor 32) The torque control is also possible (the moving roller 36 may be eliminated), but more precise control of the tension T1 is possible by using the control by the moving roller 36 together as in this embodiment. It becomes.

  As described above, the film 12 in the first conveyance section 20 is pulled by the drive roller 30, while the film 12 in the second conveyance section 22 is a drive roller or a winding device provided in the post-process 16. It is pulled by a film pulling device. In the present embodiment, the tension in the conveyance direction of the film 12 conveyed in the second conveyance section 22 is such that the film 12 conveyed in the second conveyance section 22 is pulled in the conveyance direction by a force of 200 N. An example in which the film 12 is pulled in the subsequent step 16 so that T2 (second tension) is 200 N will be described.

  Further, in the present embodiment, similarly to the moving roller 36 described above, the moving roller 38 is provided also between the second conveyance section 22 and the post-process 16. The moving roller 38 has a circumferential surface in contact with the surface of the film 12, and moves in a direction to increase the tension T2 (downward in FIG. 1) and a direction to decrease the tension T2 (upward in FIG. 1) It is freely provided, is controlled by the second tension control unit 40, and moves based on this control. The second tension control unit 40 adjusts the tension T2 such that the tension T2 becomes 200 N by moving the moving roller 38. The control of the tension T2 can be performed only by controlling the film pulling device provided in the post-process 16 (the moving roller 38 may be eliminated), but as in the present embodiment, the control by the moving roller 38 By combining them, more precise control of tension T2 becomes possible.

  Thus, in the conveyance device 10, the tension T1 and the tension T2 are controlled such that the tension T1 is 100 N and the tension T2 is 200 N by the driving roller 30, the moving roller 36, and the moving roller 38. However, since the film 12 is pulled by the drive roller 30, if the drive roller 30 slips (slip), control of the tension T1 and / or the tension T2 can not be performed. In addition, the film 12 is damaged. For this reason, as the driving roller 30, it is preferable to use a roller having high holding power, and in the present embodiment, a roller having a holding power of 60 N is used. To have a holding power of 60 N means that a tension of 60 N can be applied to the film 12 by itself (one drive roller) (the film 12 can be pulled with a force of 60 N).

  In order to increase the holding force of the driving roller 30, for example, a plurality of holes are provided on the peripheral surface, and suction is performed from this hole to increase the frictional force with the film 12 by adsorbing the film 12 on the peripheral surface. It is possible to consider such a method. Also, by providing a plurality of irregularities and / or grooves on the circumferential surface of the drive roller 30, etc., the method of enhancing the frictional force with the film 12 by devising the shape and / or material of the circumferential surface Is also conceivable.

  On the other hand, there is a limit in increasing the holding power of the driving roller 30, and if the holding power of the driving roller 30 is exceeded, the film 12 slips. For example, even if the tension T1 of the film in the first conveyance section 20 is set to 100 N and the tension T2 of the film in the second conveyance section 22 is set to 200 N in the configuration of FIG. In some cases, the drive roller 30 slips. That is, the film 12 wound around the driving roller 30 is pulled by the force of 100 N on the upstream side (the first conveyance section 20 side), and is pulled by the force of 200 N on the downstream side (the second conveyance section 22 side). As a result, the film 12 is pulled to the downstream side with a force of 100 N, but this force exceeds the holding force 60 N of the drive roller 30, so the film 12 slips to the downstream side. In the description using FIG. 2 and subsequent drawings, the same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted.

  Returning to FIG. 1, in order to prevent the above-described slippage of the drive roller 30, in the conveyance device 10, high resistance is provided between the first conveyance section 20 and the second conveyance section 22 and on the upstream side of the drive roller 30. A driven roller 50 is provided. The high-resistance driven roller 50 is a driven roller on which the film 12 is wound and rotated as the film 12 is conveyed, as in the case of the conveying roller 24 described above. The force required to rotate the film 12 and the holding power of the film 12 (frictional force with the film 12) are enhanced. Further, in the present embodiment, as the high resistance driven roller 50, a roller having a rotational resistance and a holding force of 50 N is used. The rotational resistance of 50 N means that the film 12 being wound is pulled when it is pulled with a force exceeding 50 N, and the film 12 is rotated in the opposite direction to the rotational direction (the conveying direction of the film 12) during the rotation. Indicates that a force (resistance) of 50 N is generated as a force (resistance) to pull the

  The rotational resistance of the high resistance driven roller 50 may be adjusted, for example, by adjusting the clearance between the rotating shaft and the bearing that supports the rotating shaft (gripping force with which the bearing grips the rotating shaft) and / or the rotating shaft It can be set by various known methods, such as adjusting the viscosity of grease filled between the cylinder and the bearing. In addition, the moving resistance displaced with the rotation of the high resistance driven roller 50 may be configured to move in the fluid to generate rotational resistance. Of course, the rotational resistance may be constant, for example, the viscosity of the fluid in which the aforementioned clearance etc. is mechanically and / or magnetically and / or electrically varied or the moving body moves. The rotational resistance may be varied by mechanically varying the mechanical and / or magnetic and / or electrically. In particular, in the case of a film such as an optical film which is not permitted to have a minute scratch on the surface, the variation in the rotational resistance value of the high resistance driven roller 50 is small, and smooth rotation is required. It is desirable to adjust the rotational resistance magnetically.

  The high resistance driven roller 50 needs to increase the frictional force with the film 12 by devising the shape and / or the material of the peripheral surface, such as providing a plurality of irregularities and / or grooves on the peripheral surface. There is. In the case where the high resistance driven roller 50 is provided with a groove, it is preferable to provide the groove along the rotational direction of the high resistance driven roller 50. By so doing, the gas (entrained air) trapped between the high resistance driven roller 50 and the film 12 can be efficiently removed, and the frictional force with the film 12 can be enhanced. Also, the holding force of the film 12 may be enhanced by sticking a tape for increasing the frictional force with the high resistance driven roller 50 on both sides in the width direction of the film 12. Furthermore, a nip roller may be provided to increase the holding power of the film 12 by holding the film 12 between the high resistance driven roller and the nip roller. However, in the case of an optical film, when a tape or a nip roller for increasing the frictional force is used, scratches may be generated on the surface, so it is desirable to provide a groove along the rotational direction to enhance the frictional force. In addition, in order to increase the contact area and increase the frictional force, the winding angle of the film 12 wound around the high resistance driven roller 50 (the angle of the portion of the peripheral surface of the drive roller 30 around which the film 12 is wound) is increased. Is desirable.

  By providing such a high resistance driven roller 50, the tension of the film 12 conveyed between the high resistance driven roller 50 and the drive roller 30 is a tension (intermediate tension) between T1 and T2. A transport section (hereinafter, tension adjustment section) 52 which becomes T3 (in the present embodiment, 150 N) is developed. That is, as described above, the rotation of the driving roller 30 is controlled so that the tension T1 which is the tension of the film 12 conveyed in the first conveyance section 20 becomes 100 N. However, the first conveyance section 20 and the driving roller Since a high resistance driven roller 50 is provided between them and the high resistance driven roller 50 has a rotational resistance of 50 N, in order to set the tension T1 to 100 N, the film 12 is subjected to a force of 150 N. It is necessary to rotate the drive roller 30 to pull it. As a result, the tension T3 of the film 12 transported on the tension adjustment section 52 (that is, between the high resistance driven roller 50 and the drive roller 30) becomes 150N.

  The slip of the driving roller 30 is prevented by providing (appearing) the tension adjustment section 52 as described above. That is, the film 12 wound around the driving roller 30 is pulled to the upstream side (the first conveyance section 20 side and the tension adjustment section 52 side) with a force of 150 N, and the flow side (the second conveyance section 22 side) ) As it is pulled with a force of 200 N, and as a result it is pulled with a force of 50 N downstream, but this force is below the holding force 60 N of the drive roller 30, so the drive roller 30 (film 12) does not slip .

  As described above, according to the conveyance device 10 of the present invention, the slip of the drive roller 30 (film 12) can be prevented. Further, in the transport apparatus 10 of the present invention, as shown in FIG. 3, for example, as shown in FIG. By adding the motor 62 for supplying rotational force to the drive roller 60 and the drive roller 60 without using the resistance driven roller 50, the moving roller 64 for controlling the tension of the tension adjustment section 52, and the intermediate tension control unit 66 There is no need to provide a mechanism (such as the motor 62) for rotationally driving the drive roller 60, the moving roller 64, and the intermediate tension control unit 66, as compared with the case where the slip of the drive roller 30 is prevented. Space can be reduced.

  In addition, this invention is not limited to the said embodiment, It can change suitably about the structure of a detail. For example, although the high resistance driven roller 50 is provided on the upstream side of the drive roller 30 in the above embodiment, the high resistance driven roller is provided downstream of the drive roller 30 as in the conveyance device 70 shown in FIG. 50 may be provided. As compared with the above-described transport device 10 (see FIG. 1), the transport device 70 replaces the arrangement of the drive roller 30 and the high resistance driven roller 50. Also in this configuration, a tension adjustment section 52 of tension T3 (150 N) is developed between the drive roller 30 and the high resistance driven roller 50, and the film on the upstream side and the downstream side of the drive roller 30. Since the difference in tension (50N) of 12 is less than the holding force (60N) of the drive roller 30, slippage of the drive roller 30 is prevented.

  In the above embodiment, the high resistance driven roller 50 is provided upstream or downstream of the drive roller 30 disposed between the first transport section 20 and the second transport section 22 to prevent the slip of the drive roller 30. However, the present invention is not limited thereto. For example, a third conveyance section is provided downstream of the second conveyance section 22, and a drive roller is disposed between the second conveyance section 22 and the third conveyance section to control the tension of the film 12 in the second conveyance section 22. A high resistance driven roller may be provided upstream or downstream of the drive roller to prevent the drive roller from slipping. As described above, by providing the high resistance driven roller on the upstream side or downstream side of the drive roller to be prevented from slipping, the same effect as the above embodiment can be obtained regardless of the number of transport sections (number of divisions). Can.

  Further, in the above embodiment, one high-resistance driven roller is disposed between the upstream transport section and the downstream transport section, and between the upstream transport section and the downstream transport section (drive roller In the example of preventing slip by setting the difference in tension between the upstream side and the downstream side below the holding force of the drive roller, the present invention is not limited to this. For example, in FIG. 1 or FIG. 4, when T1 is 100 N and T2 is 250 N, the tension on the upstream side and the downstream side of the drive roller 30 by one high resistance driven roller 50 (both rotational resistance and holding force are 50 N) Even if the difference (150N) is absorbed by 50N, the difference in tension (100N) exceeds the holding force (60N) of the drive roller 30, and the drive roller 30 slips.

  In such a case, the (second) high-resistance driven roller 50 is newly added to the upstream side or downstream side of the driving roller 30, so that the two high-resistance driven rollers 50 upstream of the driving roller 30. By absorbing 100 N of the tension difference (150 N) between the side and the downstream side, 50 N (retaining force (60 N) or less of the drive roller 30) can be achieved, so that slip of the drive roller 30 can be prevented. However, since the high resistance driven roller 50 is a driven roller, when the number of high resistance driven rollers 50 increases, it becomes difficult to precisely control the tension of each conveyance section. For this reason, it is preferable that the number (additional number) of the high resistance driven rollers 50 be the minimum number necessary to prevent the slip of the driving roller 30.

  Further, although the above embodiment has been described without taking into consideration the rotational resistance of the transport roller 24, the rotational resistance also exists for the transport roller 24, so the tension of each transport section increases as the number of transport rollers 24 increases. It becomes difficult to control precisely. Therefore, it is preferable to set the number of conveyance rollers 24 provided in each conveyance section to the required minimum number. In addition, when a large number of transport rollers 24 are provided in the tension adjustment section 52, the above-described problem (a problem in which precise control of tension becomes difficult) becomes more significant. For this reason, it is preferable to reduce the number of transport rollers 24 provided in the tension adjustment section 52 with priority, and more specifically, the number of transport rollers 24 provided in the tension adjustment section 52 is preferably 10 or less. More preferably, it is 5 or less, more preferably 1 or less.

10, 70 Transporting Device 12 Film (Web)
14 pre-process 16 post-process 20 first transport section 22 second transport section 24 transport roller 30, 60 drive roller 32, 62 motor (driving force supply means)
34 First tension control unit 36, 38, 64 Moving roller 40 Second tension control unit 50 High resistance driven roller 52 Tension adjustment section 66 Intermediate tension control section T1 Tension (first tension) in the film conveyance direction in the first conveyance section
T2 Tension in the film transport direction in the second transport section (second tension)
T3 Tension (intermediate tension) in the film transport direction in the tension adjustment section

Claims (9)

In a conveying device for conveying a long web,
A first conveyance section in which a tension in the conveyance direction of the web is controlled to a first tension;
A second transport section provided downstream of the first transport section in the transport direction, the second tension being controlled to a second tension greater than the first tension;
A tension adjustment section provided between the first conveyance section and the second conveyance section, wherein the tension is controlled to an intermediate tension between the first tension and the second tension;
In the tension adjustment section,
A driving roller which is wound around the outer periphery and is rotated by being supplied with a driving force by a driving force supply means, and which pulls the web by this rotation;
The web is wound around the outer periphery, and a rotational resistance is provided, and the high resistance driven roller rotates along with the movement of the web when the web is pulled by a pulling force exceeding the rotational resistance; Provided
In the tension adjustment section,
A conveyance device in which tension between the drive roller and the high resistance driven roller is controlled to the intermediate tension.   The conveying apparatus according to claim 1, wherein the peripheral surface of the high resistance driven roller is provided with unevenness.   The conveyance device according to claim 2, wherein the unevenness is a groove formed on a circumferential surface of the high resistance driven roller.   The conveyance device according to claim 3, wherein the groove is formed along a rotation direction of the driven high resistance driven roller.   The conveyance device according to any one of claims 1 to 4, wherein an angle of a portion of the circumferential surface of the high resistance driven roller where the web is wound is 90 ° or more. A bearing for supporting a rotation shaft of the high resistance driven roller;
The conveyance device according to any one of claims 1 to 5, wherein the rotational resistance is generated by the bearing.   The conveyance apparatus according to any one of claims 1 to 6, wherein the magnitude of the rotational resistance is adjusted by a magnetic force. A bearing for supporting a rotation shaft of the high resistance driven roller;
The conveyance device according to claim 7, wherein the magnitude of the rotation resistance is adjusted by adjusting the holding force when the bearing holds the rotation shaft by a magnetic force. In a conveying method for conveying a long web,
A first conveyance section in which a tension in the conveyance direction of the web is controlled to a first tension;
A second transport section, which is controlled downstream of the first transport section in the transport direction and to a second tension in which the tension is greater than the first tension;
Respectively divided into a tension adjustment section provided between the first conveyance section and the second conveyance section, the tension being controlled to an intermediate tension between the first tension and the second tension. Transport the web in a section,
A drive roller provided in the tension adjustment section, being wound around the outer periphery, being rotated by being supplied with a driving force by a driving force supply means, and pulling the web by the rotation;
The web is provided on the tension adjustment section, the web is wound around the outer periphery, and a rotational resistance is provided, and the rotational movement is performed along with the movement of the web when the web is pulled by a pulling force exceeding the rotational resistance. A conveying method of controlling tension between the driving roller and the high-resistance driven roller to the intermediate tension by using a high-resistance driven roller.

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