JP2014069903A - Device for correcting film feed direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for correcting a film feed direction which can be easily arranged in an existing bag making machine without requiring a large space, and correct the film feed direction without being affected by film thickness irregularity and without inclining.SOLUTION: The device for correcting the film feed direction includes a pair of rotary rolls where a film is held therebetween in a feeding process, and an inclining device for inclining a rotary axis line of one of the rotary rolls relatively with respect to a rotary axis line of the other of the rotary rolls, and the one of the rotary rolls has a barrel shape with a diameter smaller as approaching an end part in at least one portion in the axis line direction.

Description

  The present invention relates to a film transport direction correcting device.

  The film transported to be bag-made in the bag making machine has uneven thickness in the film base material and the adhesive between the film base materials, or the film for the bottom material as the bottom material is added. Therefore, the overall thickness is non-uniform. Thereby, it is easy to produce deviation in the conveyance direction of a film.

  Various film transport direction correcting devices for correcting the transport direction of a film that has been deviated have been known.

  The apparatus described in Patent Document 1 includes two parallel fixed bars, two moving bases disposed above the two fixed bars, and one side of the two moving bases. Driving means for widening the end portion interval and narrowing the other end portion interval. The film to be conveyed is conveyed in a U-shape in a side view in order of an interval fixing bar on the upstream side in the conveying direction, a moving base above it, a moving base on the downstream side, and an interval fixing bar below it. For example, the drive means widens the end interval on one side of the two moving bases and narrows the end interval on the other side, so that the film transport direction is corrected to the other side. .

  The apparatus described in Patent Document 2 includes a feed roller having a drum shape whose diameter is larger as it is closer to the end. A substantially uniform pulling force in the width direction acts on the film to be transported from the feed roller, thereby preventing the displacement in the film transport direction.

  The device described in Patent Document 3 includes a cylindrical guide roller and a drive mechanism that tilts the rotation axis of the guide roller. The conveyance direction of the film to be conveyed is corrected by tilting the rotation axis of the guide roller.

Japanese Utility Model Publication No. 6-13171 JP 2004-203525 A JP 2004-345781 A

  However, in the apparatus of Patent Document 1, since the two interval fixing bars and the two moving bases are arranged in a U shape in a side view, it is necessary to secure a large installation space for the apparatus.

  In addition, the apparatus of Patent Document 2 employs the principle that the feed roller and the film act in contact with each other in the width direction of the film, so that it is difficult to cope with film thickness unevenness.

  Further, in the apparatus of Patent Document 3, the film transport path itself is inclined by the change in the angle of the guide roller. However, it is not easy to design and construct the film transport system so that the tilt does not cause a problem. Absent.

  The present invention has been made paying attention to such problems, and its purpose is not to require a large space, it can be easily installed in an existing bag making machine, and the film thickness is uneven. It is an object of the present invention to provide a film transport direction correcting device capable of correcting without being influenced and without tilting the transport direction of the film.

  The present invention tilts a pair of rotating rolls in which a film in the conveyance process is sandwiched and a rotating axis of one rotating roll relative to the rotating axis of the other rotating roll. And a tilting device, wherein the one-side rotating roll has a barrel shape whose diameter is smaller toward the end in at least a part of the axial direction.

  According to the present invention, the rotating roll at the abutting position is brought into contact with, for example, a smaller diameter portion on the right side of the rotating roll on one side having a barrel shape at least in part with the film in the conveyance process. The peripheral speed of the film conveyance by can be reduced. If this is utilized, when the conveyance direction of a film is biased to the left side, the film on the left side can be conveyed faster, and as a result, the conveyance direction of the film can be corrected.

  In addition, according to the present invention, since the film in the conveyance process is sandwiched between a pair of rotating rolls, the conveyance direction in the side view of the film does not change in the original linear shape (that is, It can contribute to space saving and can be easily installed in an existing bag making machine (without tilting the film transport direction). Further, the rotating roll on one side has a barrel shape in at least a part in the axial direction, and the rotating roll is in contact with only a part in the width direction of the film in the conveyance process, and the contact position is When the rotary roll is tilted relatively, it only moves in the width direction. Therefore, the degree affected by the film thickness unevenness is remarkably small.

  Preferably, an end detection sensor for detecting the position of the end of the film is further provided on the upstream side or the downstream side of the film in the conveyance process sandwiched between the pair of rotating rolls. According to such an aspect, the shift | offset | difference of the conveyance direction of a film can be easily detected based on the detection result of an edge part detection sensor.

  In this case, it is more preferable to further include a control unit that controls the tilting device based on the detection result of the end detection sensor. According to such an aspect, it is possible to automatically correct the film conveyance direction. This eliminates the need for the operator to adjust the film position, thereby contributing to shortening the adjustment time and reducing the adjustment burden on the operator and the occurrence of defects due to insufficient adjustment.

  Specifically, for example, when the detection result of the end detection sensor is on one side from a predetermined position, the control unit tilts so that the rotation axis interval between the pair of rotating rolls becomes wider toward the one side. The tilting device is configured to control the device, and when the detection result of the end detection sensor is on the other side of the predetermined position, the interval between the rotation axes of the pair of rotating rolls becomes wider toward the other side. Is to control.

  Preferably, at least one of the pair of rotating rolls is made of an elastic material. According to such an aspect, when the rotary roll made of an elastic material is pressed against the other rotary roll and is recessed, the contact between the barrel-like rotary roll and the film is ensured.

  Further, for example, the tilting device is configured to move one end portion of the one-side rotating roll in a vertical plane, and the other end portion of the one-side rotating roll is connected to the other-side rotating roll. It is stationary against it.

  Alternatively, for example, the tilting device moves one end and the other end of the one-side rotary roll in opposite directions within a vertical plane.

  According to the present invention, the rotating roll at the abutting position is brought into contact with, for example, a smaller diameter portion on the right side of the rotating roll on one side having a barrel shape at least in part with the film in the conveyance process. The peripheral speed of the film conveyance by can be reduced. If this is utilized, when the conveyance direction of a film is biased to the left side, the film on the left side can be conveyed faster, and as a result, the conveyance direction of the film can be corrected.

  In addition, according to the present invention, since the film in the conveyance process is sandwiched between a pair of rotating rolls, the conveyance direction in the side view of the film does not change in the original linear shape (that is, It can contribute to space saving and can be easily installed in an existing bag making machine (without tilting the film transport direction). Further, the rotating roll on one side has a barrel shape in at least a part in the axial direction, and the rotating roll is in contact with only a part in the width direction of the film in the conveyance process, and the contact position is When the rotary roll is tilted relatively, it only moves in the width direction. Therefore, the degree affected by the film thickness unevenness is remarkably small.

It is a schematic perspective view of 1st embodiment of the film conveyance direction correction apparatus by this invention. It is a schematic block diagram of the film of conveyance object. It is a figure for demonstrating the process by which the conveyance direction of a film is corrected using the film conveyance direction correction apparatus of FIG. It is a schematic perspective view of 2nd embodiment of the film conveyance direction correction apparatus by this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a first embodiment of a film transport direction correcting device according to the present invention. As shown in FIG. 1, the film transport direction correcting device 10 of the present embodiment includes a pair of rotating rolls 11 and 12 in which a film 20 in a transporting process is sandwiched therebetween, and a rotating roll 12 on one side. And a tilting device 13 for tilting the rotation axis relative to the rotation axis of the rotary roll 11 on the other side.

  FIG. 2 is an example of a schematic configuration diagram of the film 20 to be conveyed. The film 20 to be transported in the present embodiment is a film that is transported so as to be made into a bag on a stand pouch, for example, and between the pair of original films 21 and 22 and the pair of original films 21 and 22. A pair of bottom film 23a, 23b arranged in an inwardly folded state at one end and the other end in the width direction of the pair of original films 21, 22 and the pair of bottom film There may be a pair of chuck members 24a and 24b disposed in parallel with the pair of bottom film 23a and 23b between the pair 23a and 23b. Thus, since the pair of bottom film 23a, 23b and the pair of chuck materials 24a, 24b may be sandwiched between the pair of original films 21, 22, the thickness of the entire film 20 is not large. It is uniform.

  Returning to FIG. 1, in the present embodiment, the film 20 to be transported is transported in the horizontal direction by a known transport device of a bag making machine (not shown), and the film transport direction The pair of rotating rolls 11 and 12 of the correction device 10 are respectively disposed adjacent to the lower surface and the upper surface of the film 20 in the conveyance process.

  The lower rotating roll 11 is made of an elastic material and has a cylindrical shape. The lower rotary roll 11 is pivotally supported by a support member (not shown) in a posture in which the rotation axis is oriented horizontally.

  On the other hand, the upper rotating roll 12 is made of an inelastic material (for example, a metal material), and has a barrel shape with a smaller diameter as it is closer to the end in at least a part of the axial direction as shown in FIG. As a specific example of the upper rotating roll 12, the diameter of both ends is 66 mm, the diameter of the center is 70 mm, and the length in the axial direction is 680 mm. The upper rotating roll 12 is pivotally supported by the tilting device 13 at such a height that a part of the lower surface is brought into contact with the upper surface of the lower rotating roll 12 via the film 20 in the process of conveyance.

  The tilting device 13 of the present embodiment is configured to move the right end portion of the upper rotary roll 12 in FIG. 1 within the vertical plane, and the left end portion of the upper rotary roll 12 in FIG. 11 is stationary.

  Specifically, the tilting device 13 of the present embodiment has a pair of column members 17a and 17b. As shown in FIG. 1, the pair of column members 17 a and 17 b are vertically provided on the right side and the left side of the upper rotary roll 12 in FIG. 1.

  A spherical sliding bearing 18b whose sliding contact surface is a spherical surface is provided on the right side surface of the left column member 17b erected on the left side in FIG. 1, and the left end portion of the upper rotary roll 12 is the spherical sliding bearing 18b. Is pivotally attached to the left column member 17b. The details of the spherical plain bearing 18b conform to the contents defined in JIS B0161.

  On the other hand, a linear guide 14a extending in a direction parallel to the vertical surface (for example, the vertical direction) is provided on the left side surface of the right column member 17b erected on the right side in FIG. On the linear guide 14a, a nut portion of a ball screw 15a having a screw portion parallel to the linear guide 14a is slidably attached to the linear guide 14a, and a motor 16a is attached to the screw portion of the ball screw 15a. It is connected.

  A spherical plain bearing 18a is provided on the left side of the nut portion of the ball screw 15a, and the right end of the upper rotary roll 12 is pivotally attached to the nut portion of the ball screw 15a via the spherical plain bearing 18a. Yes.

  Accordingly, when the screw portion of the ball screw 15a is rotated by the motor 16a, the nut portion of the ball screw 15a is moved in the vertical plane along the linear guide 14a. The movement amount of the nut portion of the ball screw 15a is very small, and the right end portion and the left end portion of the upper rotary roll 12 are continuously supported by the spherical plain bearings 18a and 18b, respectively. As a result, the left end portion of the upper rotary roll 12 is stationary with respect to the lower rotary roll 11, and the right end portion of the upper rotary roll 12 is moved in the vertical plane together with the nut portion of the ball screw 15a. The rotation axis of the upper rotation roll 12 is tilted relative to the rotation axis of the lower rotation roll 11.

  In the present embodiment, an end detection sensor that detects the position of the end of the film 20 on the upstream side or the downstream side in the transport direction of the film 20 in the transport process between the pair of rotating rolls 11 and 12. 31 and 32 are provided. Specifically, the end detection sensors 31 and 32 are known optical edge sensors. The end detection sensors 31 and 32 have, for example, a U-shape, and the right end portion of the film 20 in the conveyance process in FIG. 1 passes through the inside of the end detection sensors 31 and 32.

  A control unit 19 that controls the tilting device 13 based on the detection results of the end detection sensors 31 and 32 is connected to the end detection sensors 31 and 32.

  Specifically, the control unit 19 is configured by a computer system, and the setting position of the right end portion in FIG. 1 of the film 20 in the conveyance process is stored in advance. The control unit 19 reads the detection result from the end detection sensors 31 and 32, compares the detection result with a preset stored position, and the detection result of the end detection sensors 31 and 32 is on the right side of the predetermined position. The tilting device 13 is controlled so that the contact positions of the pair of rotary rolls 11 and 12 (via the film 20) are shifted to the left side, and the end detection sensors 31 and 32 are detected. When the result is on the left side from the predetermined position, the tilting device 13 is controlled so that the contact positions of the pair of rotary rolls 11 and 12 (via the film 20) are shifted to the right side.

  Next, the operation of the present embodiment having such a configuration will be described.

  As shown in FIG. 1, in a state where a film 20 to be transported is sandwiched between a pair of rotating rolls 11, 12, the transport of the film 20 is started in the transport direction indicated by the arrow in FIG. 1. . At this time, the rotation axes of the pair of rotating rolls 11 and 12 are parallel to each other. As the film 20 is conveyed, the pair of rotating rolls 11 and 12 are respectively driven to rotate about the rotation axis.

  During conveyance of the film 20, the position of the right end portion in FIG. 1 of the film 20 is detected by the end detection sensors 31 and 32, and the detection result is compared with the set position stored in the control unit 19.

  As shown in FIG. 3A, when the position of the right end portion of the film 20 in the conveyance process coincides with a predetermined position (when no deviation occurs in the conveyance direction), the control unit 19 rotates the upper rotary roll 12. The axis is maintained parallel to the rotation axis of the lower rotary roll 11 (the tilting device 13 does not operate).

  On the other hand, as shown in FIG. 3B, when the position of the right end portion of the film 20 in the conveyance process is on the right side of the predetermined position, the control unit 19 causes the pair of rotating rolls 11 to appear as shown in FIG. The tilting device 13 is actuated so that the contact positions of the 12 (via the film 20) shift to the left. At this time, at the contact position of the upper rotary roll 12 having a barrel shape, the peripheral speed is smaller because the diameter is smaller than before the shift. Therefore, the conveyance speed at the contact position of the film 20 decreases, and the conveyance speed increases toward the right side. Thereby, the conveyance direction of the film 20 in the conveyance process is corrected to the left side, and the position of the right end portion of the film 20 moves to the left side and approaches a predetermined position. When the position of the right end portion of the film 20 in the conveyance process returns to the predetermined position, the rotation axis of the upper rotary roll 12 is returned in parallel with the rotation axis of the lower rotary roll 11.

  On the contrary, when the position of the right end of the film 20 in the conveyance process is on the left side of the predetermined position, the control unit 19 causes the pair of rotary rolls 11 and 12 to contact each other (via the film 20). The tilting device 13 is actuated so that is shifted to the right side. At this time, at the contact position of the upper rotary roll 12 having a barrel shape, the peripheral speed is smaller because the diameter is smaller than before the shift. Therefore, the conveyance speed at the contact position of the film 20 decreases, and the conveyance speed increases toward the left side. Thereby, the conveyance direction of the film 20 in the conveyance process is corrected to the right side, and the position of the right end portion of the film 20 moves to the right side and approaches a predetermined position. When the position of the right end portion of the film 20 in the conveyance process returns to the predetermined position, the rotation axis of the upper rotary roll 12 is returned in parallel with the rotation axis of the lower rotary roll 11.

  According to the present embodiment as described above, for example, a smaller diameter portion on the right side of the one-side rotary roll 12 having a barrel shape at least in part is brought into contact with the film 20 in the conveyance process. The peripheral speed of film conveyance by the rotary roll 12 at the contact position can be reduced. If this is utilized, when the conveyance direction of the film 20 is biased to the left side, the film 20 on the left side can be conveyed faster, and as a result, the conveyance direction of the film 20 can be corrected. it can.

  Moreover, according to this Embodiment, since the film 20 of a conveyance process is pinched | interposed between a pair of rotary rolls 11 and 12, the side view conveyance direction of the film 20 changes with the original linear form. It is easy to install in an existing bag-making machine, as well as to contribute to space saving (ie, without tilting the transport direction of the film 20). Further, the rotating roll 12 on one side has a barrel shape in at least a part in the axial direction, and the rotating roll 12 is in contact with only a part in the width direction of the film 20 in the conveyance process. The contact position only moves in the width direction when the rotary rolls 11 and 12 are relatively tilted. Therefore, the degree affected by the thickness unevenness of the film 20 is remarkably small.

  Moreover, according to this Embodiment, since the edge part detection sensors 31 and 32 are provided, based on the detection result of the edge part detection sensors 31 and 32, the shift | offset | difference of the conveyance direction of the film 20 is detected easily. be able to. In this case, the end detection sensors 31 and 32 may be provided only on either the upstream side or the downstream side in the transport direction, instead of being provided on the upstream side and the downstream side in the transport direction, respectively. .

  Moreover, according to this Embodiment, since the control part 19 is provided, it becomes possible to correct the conveyance direction of the film 20 automatically. This eliminates the need for the operator to adjust the film position, thereby contributing to shortening the adjustment time and reducing the adjustment burden on the operator and the occurrence of defects due to insufficient adjustment.

  Further, according to the present embodiment, since at least one of the pair of rotating rolls 11 and 12 is made of an elastic material, the rotating roll 11 made of an elastic material is pressed against the other rotating roll 12. As a result, the contact between the rotary roll 11 having a barrel shape and the film 20 is ensured. In this case, instead of the lower rotary roll 11 made of an elastic member, the upper rotary roll 12 may be made of an elastic member, and both the upper rotary roll 12 and the lower rotary roll 11 are made of an elastic member. May be.

  In addition, the adhesive of the one end part of the width direction of the film 20 of a conveyance process may protrude, and the said one end part may not have linear form. In this case, the other end portion of the linear film 20 should pass through the inside of the U-shaped end detection sensors 31 and 32.

  Next, a second embodiment of the film transport direction correcting device according to the present invention will be described with reference to FIG.

  In FIG. 4, the conveyance direction correcting device 10 is different only in that the tilting device 13 moves one end and the other end of the rotating roll 12 on one side in opposite directions within a vertical plane. Other configurations are the same as those of the embodiment shown in FIG.

  In FIG. 4, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 4, in the tilting device 13 of the present embodiment, a linear guide 14b extending in a direction parallel to the vertical surface is also provided on the right side surface of the left column member 17b erected on the left side. The linear guide 14b provided on the left column member 17b is parallel to the linear guide 14a provided on the right column member 17a. The nut portion of the ball screw 15b having a screw portion parallel to the linear guide 14b is also slidably attached to the linear guide 14b on the linear guide 14b provided on the left column member 17b. A motor 16b is connected to the screw portion of the ball screw 15b.

  Also, a spherical plain bearing 18b is provided on the right side surface of the nut portion of the left ball screw 15b in FIG. 4, and the left end portion of the upper rotary roll 12 is connected to the nut portion of the ball screw 15b via the spherical plain bearing 18b. It is pivotally attached to.

  In the film conveyance direction correcting device 10 shown in FIG. 4, the screw portions of the ball screws 15a and 15b are rotated by the motors 16a and 16b, respectively, and the nut portions of the ball screws 15a and 15b are mutually aligned in the vertical plane along the linear guides 14a and 14b. It is moved in the opposite direction. The amount of movement of the nut portions of the ball screws 15a and 15b is very small, and the right end portion and the left end portion of the upper rotary roll 12 are continuously supported by the spherical plain bearings 18a and 18b, respectively. As a result, the right end portion and the left end portion of the upper rotary roll 12 are moved in the opposite directions in the vertical plane together with the nut portions of the ball screws 15a and 15b. As a result, the rotation axis of the upper rotary roll 12 The rotary roll 11 is tilted relative to the rotation axis.

  Also according to the second embodiment as described above, the same effect as the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Film conveyance direction correction apparatus 11 Lower rotation roll 12 Upper rotation roll 13 Tilt device 14a, 14b Linear guide 15a, 15b Ball screw 16a, 16b Motor 17a, 17b Spherical member 18a, 18b Spherical plain bearing 19 Control part 20 Film 21, 22 Original film 23a, 23b Bottom material film 24a, 24b Chuck material 31, 32 Edge detection sensor

Claims (7)

A pair of rotating rolls adapted to sandwich the film in the process of conveyance;
A tilting device that tilts the rotation axis of the one-side rotary roll relative to the rotation axis of the other-side rotary roll;
With
The film transport direction correcting device according to claim 1, wherein the one-side rotating roll has a barrel shape having a smaller diameter as it approaches the end in at least a part of the axial direction. The edge detection sensor which detects the position of the edge part of the said film further in the upstream or downstream side of the film of the conveyance process pinched | interposed between the said pair of rotation rolls, It is characterized by the above-mentioned. Film transport direction correction device. The film transport direction correcting device according to claim 2, further comprising a control unit that controls the tilting device based on a detection result of the end detection sensor. When the detection result of the end detection sensor is on one side from a predetermined position, the control unit controls the tilting device so that the rotation axis interval between the pair of rotating rolls becomes wider toward the one side. When the detection result of the end detection sensor is on the other side from the predetermined position, the tilting device is controlled so that the rotation axis interval of the pair of rotating rolls becomes wider toward the other side. The film conveyance direction correcting device according to claim 3, wherein The film transport direction correcting device according to claim 1, wherein at least one of the pair of rotating rolls is made of an elastic material. The tilting device is adapted to move one end of the one-side rotary roll in a vertical plane,
6. The film transport direction correcting device according to claim 1, wherein the other end of the one-side rotating roll is stationary with respect to the other-side rotating roll. 6. The tilting device according to claim 1, wherein one end and the other end of the one-side rotating roll are moved in opposite directions within a vertical plane. Film transport direction correction device.

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