JP2007039172A - Method and device for correcting sheet meandering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for correcting sheet meandering capable of correcting the meandering of a long sheet without folding it back, and simplifying the structure. <P>SOLUTION: Correction units 21a, 21b and displacement sensors 41a, 41b are arranged on both ends in the width direction of a sheet 2. Correction rollers 20a, 20b are arranged in the respective correction units in an advancing/retracting manner to/from the sheet 2. The direction of the pair of right and left correction rollers 20a, 20b is set in an oblique direction of θ1 and θ2 opposite to each other in the right-to-left direction with respect to the sheet conveying direction X. When the sheet 2 is meandered to either right or left, any one of the pair of right and left correction rollers 20a, 21b is brought into contact with the sheet 2, and rotated to move the sheet 2 in the direction opposite to the meandering direction, and the meandering is corrected thereby. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sheet meandering correction method and a meandering correction apparatus that detect and automatically correct meandering of a sheet conveyed in a fixed direction.

  The sheet is fed from a sheet roll around which a long sheet (film) such as a resin sheet or a metal sheet is wound, and is stretched by a tension roller and conveyed in the sheet length direction. A meandering correction device for automatically correcting the meandering of the sheet is incorporated. This meandering correction device is a device that stretches a sheet with a plurality of correction rollers longer than the width of the sheet and returns the meandering sheet to the normal conveying direction while folding and conveying the sheet several times. There is a meandering correction device dedicated to the conveyance device (see, for example, Patent Document 1) and a general-purpose meandering correction device applicable to various existing sheet conveyance devices.

  9A and 9B show a general sheet conveying apparatus that feeds the sheet 2 from the sheet roll 1 and conveys the sheet 2 in the sheet length direction. FIG. 10 shows the sheet meandering correction device 5 having the general-purpose structure described above. The sheet conveying apparatus in FIG. 9 intermittently conveys the sheet 2 fed from the sheet roll 1 on the plurality of horizontal feed rollers 3 in the sheet length direction. The sheet 2 is conveyed while being stretched in a predetermined conveyance direction. A meandering correction position P1 is installed in a part of the sheet conveying path, and the meandering correction device 5 of FIG. 10 is installed at this position P1. The meandering correction device 5 corrects the sheet to be returned to the normal conveyance direction when the conveyed sheet 2 meanders in the width direction. The meandering corrected sheet 2 is intermittently conveyed to the next work position, for example, a sheet punching work position P2 for partially punching the sheet 2. When the press machine 4 is installed at the sheet punching operation position P2, and the sheet 2 is intermittently conveyed and stopped, the press machine 4 is operated to partially copy the sheet 2 into, for example, a rectangular portion 2 indicated by a chain line in FIG. 9B. 'Punch out. The rectangular portion 2 ′ is a central portion in the width direction excluding both end portions in the width direction of the sheet 2. The punched rectangular portion 2 ′ is taken out as a sheet product and sent to another manufacturing process, and a rectangular punching hole 6 is formed in the sheet 2. The sheet 2 is intermittently conveyed at the arrangement pitch of the punching holes 6 and the press machine 4 is operated once to punch the sheet 2 every time it is intermittently conveyed once. If the sheet 2 meanders and is carried into the press 4, the position of the rectangular portion 2 ′ is shifted at the time of punching or wrinkles are generated, making it impossible to perform good punching. Therefore, the meandering of the sheet 2 is detected by the meandering correction device 5 before the press machine 4, and if the meandering exceeds the allowable amount, the meandering is corrected.

  The meandering correction device 5 is a drive that horizontally rotates the pair of front and rear guide rollers 11 and 12 on the upstream side and the downstream side, the pair of front and rear correction rollers 13 and 14 on the upstream side and the downstream side, and the pair of correction rollers 13 and 14. A device 16, a displacement sensor 17 that detects the amount of meandering of the seat 2, and a controller 18 that controls the overall movement are provided. Each of the four rollers 11 to 14 is slightly longer than the width of the sheet 2 and contacts the sheet 2 conveyed from the upstream side to the downstream side in the width direction and is driven to rotate. The pair of front and rear correction rollers 13 and 14 are connected to a pair of left and right connecting plates 17. The sheet 2 sent in a predetermined horizontal conveyance direction from the upstream side of the sheet roll 1 of FIG. 9 is first conveyed in a folded state directly with the surface contacting the upstream guide roller 11, and the upstream correction roller 13. Head for. The back surface of the sheet 2 is brought into contact with the correction roller 13 and folded back horizontally, and travels toward the correction roller 14 on the downstream side. Further, the back surface of the sheet 2 comes into contact with the correction roller 14, and is folded back and conveyed toward the guide roller 12 on the downstream side. The surface of the sheet 2 is returned to the original horizontal conveyance direction with the surface contacting the guide roller 12.

If the sheet 2 meanders while the sheet 2 is conveyed from the upstream guide roller 11 to the downstream guide roller 12, the displacement sensor 17 detects the meandering amount and transmits it to the controller 18. The controller 18 detects the presence or absence of the meandering of the sheet 2 from the detection signal of the displacement sensor 17, calculates the meandering amount, and determines whether or not the meandering correction is performed. When it is determined that the meandering correction is performed, a drive control signal is output to the drive device 16. The drive device 16 turns the pair of correction rollers 13 and 14 horizontally with the sheet 2 at a desired angle using a servo motor as a drive source. With this horizontal turning operation, the meandering of the sheet 2 conveyed from the upstream correction roller 13 to the downstream correction roller 14 is corrected.
Japanese Patent Laid-Open No. 06-239506 (FIG. 1)

  As described above, a meandering correction device that corrects meandering of a sheet while conveying the sheet in a state in which a certain length portion of a long sheet is stretched by a pair of front and rear correction rollers, includes a pair of front and rear correction rollers. A complicated operation such as horizontal turning is required, which complicates the overall structure and requires expensive driving equipment and a controller. In addition, because the guide roller is applied to the surface of the horizontally conveyed sheet and folded back to the correction roller, depending on the type of the sheet, problems such as sheet damage or quality deterioration may occur due to multiple sheet folding. There is. Furthermore, since a roller longer than the sheet width is brought into contact with the front and back surfaces of the sheet and conveyed and folded up and down, the surface of the sheet may be damaged by contact with the roller and the quality may deteriorate.

  For example, the rectangular portion 2 ′ of the sheet 2 punched out by the press 4 in FIG. 9 is a sheet product in which an electric circuit of a conductive pattern is formed on the surface, or a sheet product in which letters and figures are transferred or stamped on the surface. In some cases, if the sheet 2 is folded back several times to correct meandering, or if the guide roller 11 or the like is pressed against the surface, the electric circuit formed on the surface of the sheet product may be disconnected or the marking may be damaged. May cause deterioration of quality and manufacturing yield.

  An object of the present invention is to provide a method and apparatus for correcting meandering without folding a sheet.

  In order to achieve the above object, the method of the present invention is capable of approaching and separating from one side of a sheet conveyed in the sheet length direction from a fixed direction, and an oblique direction that is non-parallel to the predetermined conveyance direction of the sheet when locally contacting the sheet And a displacement roller that detects the presence of meandering on the left and right sides of the width direction of the sheet, and makes the correction roller contact the sheet with a meandering signal of the displacement sensor. The correction roller is separated from the sheet by a meander-free signal.

  Here, the correction roller is a rubber roller having a small width, a hollow rubber ring, or the like. When the correction roller approaches one side of the sheet, a part of the outer periphery comes into contact with a local part on one side of the sheet and rotates following the conveyance of the sheet. The direction of the correction roller when the correction roller is driven to rotate, that is, the direction orthogonal to the rotation center line of the correction roller and parallel to one side of the sheet that the correction roller contacts is defined as the sheet conveyance direction. Set in a non-parallel diagonal direction. In this case, when the correction roller contacts and rotates on one side of the sheet, the correction roller applies tension to the sheet in an oblique direction that is not parallel to the fixed conveyance direction, so that the sheet is either left or right. Displaced in the direction and conveyed. By appropriately determining the direction of the correction roller and selecting the presence or absence of contact with the sheet, correction for returning the meandering sheet to the fixed conveyance direction is performed. One or a plurality of such correction rollers are used for one sheet. In the case of a single correction roller, the direction in which the sheet is driven and rotated may be switched to the left diagonal direction or right diagonal direction. In addition, the local portion of one side of the sheet where the correction roller appropriately contacts can be set at an arbitrary position such as an end portion in the width direction of the sheet or a central portion in the width direction.

  In the method of the present invention, the correction roller includes a pair of first correction roller and second correction roller that are driven to rotate in a right oblique direction and a left oblique direction that are not parallel to a predetermined conveyance direction of the sheet, and are displaced. Based on the detection signal of the presence / absence of meandering from the sensor, the presence / absence of contact between the first correction roller and the sheet and between the second correction roller and the sheet can be switched.

  Here, each of the first correction roller and the second correction roller can be of the same size and structure, and is installed so as to be driven and rotated in either the left or right oblique direction that is not parallel to the sheet conveyance direction. The The direction of the driven rotation is made different between the first correction roller and the second correction roller, and when it is necessary to correct the meandering of the sheet, one of the first correction roller and the second correction roller is brought into contact with the sheet.

  In order to achieve the above object, the apparatus of the present invention can approach and separate from one side of a sheet conveyed in the sheet length direction from a fixed direction, and is non-parallel to a predetermined conveyance direction of the sheet when locally contacting the sheet. A correction unit having a correction roller that is driven to rotate in an oblique direction and corrects the sheet conveyance direction in an oblique direction, and a displacement sensor that detects the presence or absence of meandering on the left and right in the width direction of the sheet. A swing block connected to the base so as to be swingable in a direction parallel to one side of the sheet, and a rotation block connected to the swing block so as to be rotatable in a direction orthogonal to the swing direction of the swing block. A moving block, a correction roller rotatably supported by the rotating block, and a drive source fixed to the base to rotate the rotating block in a direction in which the correcting roller approaches and separates from the sheet. And wherein the door.

  In this case, the correction unit has a pair of a first correction unit and a second correction unit, and the correction roller of the first correction unit is disposed in the first correction unit in a right oblique direction that is not parallel to the sheet conveyance direction. In the second correction unit, the correction roller of the second correction unit can be rotated in the left oblique direction that is not parallel to the sheet conveyance direction. In addition, a brake member that restricts idle rotation of the correction roller can be attached to the correction roller of the correction unit.

  According to the present invention, only when a sheet conveyed in a fixed direction meanders and correction is required, the correction roller is brought into contact with a local portion such as a widthwise end portion on one side of the sheet and driven to rotate, and the meander correction is completed. Since the correction roller is separated from the sheet, there is no problem that the sheet is folded several times for correcting the meandering, and the degree of freedom in designing the single side of the sheet where the correction roller appropriately contacts is increased. For example, when an electric circuit is designed in the center in the width direction on one side of the sheet and applied to a product manufacturing process in which the center in the width direction is punched, the correction roller is appropriately in contact with the end in the width direction of the sheet. Accordingly, since the product is manufactured in a state where the central portion in the width direction is protected from the external member, it is possible to achieve excellent effects such as improvement of product quality and improvement of manufacturing yield.

  Further, since the sheet is occasionally meandered by bringing the correction roller into contact with one side of the sheet while being conveyed in a fixed direction, it is possible to easily perform in-line such as directly applying the meandering correction apparatus to the existing sheet conveying apparatus. In addition, the meandering correction device that can be easily inlined is configured with a simple structure, space-saving, and low cost by a correction roller that is driven to rotate by conveying the sheet and a member that supports the correction roller so as to be able to approach and separate from the sheet. And can be inlined with an existing sheet conveying apparatus in terms of capital investment.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  An embodiment of a sheet meandering correction apparatus applied to the sheet conveying apparatus of FIG. 8 will be described with reference to FIGS. 1 to 4A and 4B. The sheet meandering correction device automatically corrects the meandering of the left and right sides in the width direction of the sheet 2 fed out from the sheet roll 1 of FIG. 9 and horizontally conveyed in the length direction. The pair of left and right first correction units shown in FIG. 21a, a second correction unit 21b, and a pair of left and right displacement sensors 41a and 41b shown in FIG. The first correction roller 20a is supported by the first correction unit 21a so as to be movable up and down, and the second correction roller 20b is supported by the second correction unit 21b so as to be movable up and down. Each of the pair of left and right correction rollers 20 a and 20 b has a width that is sufficiently smaller than the width of the sheet 2, and is disposed one by one at both ends in the width direction of the sheet 2.

  Assuming that the normal conveyance direction when the sheet 2 is conveyed in a fixed direction without meandering is X, the pair of left and right first correction rollers 20a and the second correction roller 20b is formed of the sheet 2 as shown by the chain line in FIG. It arrange | positions at planar width direction both ends. When the sheet 2 meanders, one of the pair of right and left correction rollers 20 a and 20 b comes into contact with the sheet 2 and is rotated by the conveying force of the sheet 2. If the horizontal driven rotation direction orthogonal to the rotation center line of the first correction roller 20a is X ′ and the horizontal driven rotation direction orthogonal to the rotation center line of the second correction roller 20b is X ″, the normal conveyance direction X is On the other hand, the driven rotation direction X ′ of the first correction roller 20a is inclined leftward at an angle θ1, and the driven rotation direction X ″ of the second correction roller 20b is inclined rightward at an angle θ2. The angles θ1 and θ2 are appropriately adjusted depending on the thickness and material of the sheet 2, the meandering wrinkle of the sheet 2, and the like. The pair of left and right first correction units 21a and second correction units 21b have the same basic structure, and a specific example of one of the first correction units 21a will be described with reference to FIGS.

  The first correction unit 21a is connected to the base 22 so as to be swingable in a direction parallel to the base 22 installed at a fixed position on the side of the sheet conveyance path and the upper surface (hereinafter referred to as the front surface) of the horizontally conveyed sheet 2. Oscillating block 23, a rotating block 24 connected to the oscillating block 23 so as to be vertically rotatable, a roller support shaft 25 having a rear end fixed to the rotating block 24, and the rotating block 24. Is provided with a drive source 26 for appropriately rotating the motor. The first correction roller 20a is pivotally attached to the tip end portion of the roller support shaft 25. The first correction roller 20a is provided with a brake member 30a such as a torque keeper for energizing an appropriate brake force to the rotating correction roller 20a to prevent idling.

  The base 22 has a horizontal base 22b and a vertical base 22c, and a base end portion of the swing block 23 is connected by a connection adjusting shaft 28 to an L-shaped bracket 27 fixed to a side surface of the vertical base 22c. The swing block 23 can swing in the horizontal direction with the connection adjustment shaft 28 as a fulcrum, and the connection adjustment shaft 28 is manually loosened to swing the swing block 23 back and forth, whereby the first correction roller 20a is driven to rotate. The oblique angle θ1 in the direction X ′ is adjusted. A balancer 29 is installed at the tip of the swing block 23. A connecting shaft 31 projects from the side surface of the tip of the swing block 23, and the central portion of the L-shaped rotation block 24 is rotatably supported by the tip of the connecting shaft 31. As shown in FIG. 3, the rotation block 24 includes a vertical portion 24 b extending upward from the connection shaft 31 and a horizontal portion 24 c extending forward from the connection shaft 31. A roller support shaft 25 protrudes from the side surface of the front end of the horizontal portion 24c, and the first correction roller 20a is pivotally supported by the front end. A spring member 32 that is always biased downward is connected to the horizontal portion 24c. The upper end of the vertical portion 24 b is reciprocally driven back and forth by the drive source 26. The drive source 26 is a cylinder provided with a piston rod 33 protruding therefrom. When this cylinder is operated to advance the piston rod 33, the vertical portion 24b is pushed rightward in FIG. 3, and the rotation block 24 rotates rightward with the connecting shaft 31 as a fulcrum. With this clockwise rotation, the horizontal portion 24 c rotates upward, and the first correction roller 20 a is detached from the sheet 2. When the operation of the drive source 26 is stopped, the rotation block 24 rotates counterclockwise in FIG. 3 due to the elasticity of the spring material 32, the vertical portion 24b retracts the piston rod 33, and the horizontal portion 24 rotates downward. The first correction roller 20a is pressed against the surface of the sheet 2.

  Since the second correction unit 21b shown in FIG. 1 has the same structure as the first correction unit 21a, the same reference numerals are given to the same parts, and detailed description is avoided. As shown in FIG. 1, when the first correction unit 21a is arranged on the left side in the sheet 2 conveyance direction, the second correction unit 21b is arranged on the right side. The correction rollers 20a and 20b of the correction units 21a and 21b are arranged so as to be able to approach and separate toward the local portions at both ends in the width direction of the sheet 2.

  The pair of left and right displacement sensors 41a and 41b detect the presence / absence of the meandering and the meandering amount at both ends in the width direction of the sheet 2. The displacement sensors 41a and 41b are installed in the vicinity of the correction rollers 20a and 20b, respectively, and are arranged at fixed positions at a minute fixed distance from both ends in the width direction of the sheet 2. The left displacement sensor 41a in FIG. 4A detects the meandering amount when the sheet 2 meanders to the left in FIG. Further, the right displacement sensor 41b in FIG. 4A detects the meandering amount when the sheet 2 meanders to the right in FIG. Such displacement sensors 41a and 41b may be the same as the displacement sensor of FIG. A meandering presence / absence detection signal and a meandering amount detection signal from each displacement sensor 41a, 41b are sent to a unit drive control circuit (not shown). The unit drive control circuit corrects the meandering of the sheet 2 by selecting one of the pair of right and left correction rollers 20a and 20b according to the presence / absence of the meandering of the sheet 2 and the amount of meandering and bringing it into contact with the sheet 2.

  FIG. 4A shows a state where the sheet 2 is conveyed in the fixed direction X without meandering. At this time, the pair of left and right displacement sensors 41a and 41b are at a constant distance from the end of the sheet 2, and both detect no meandering. At this time, the pair of left and right correction units 21a and 21b separate the corresponding correction rollers 20a and 20b from the both ends of the sheet 2 by a predetermined distance, and hold the state. Therefore, in the state of FIG. 4A, the pair of right and left correction units 21a and 21b do not operate, the meandering correction of the sheet 2 is not performed, and the sheet 2 is intermittently conveyed in the fixed direction X to perform various work processes. Sent.

  When the sheet 2 meanders to the left or right from the fixed direction X and the amount of meandering exceeds the reference level, the pair of left and right displacement sensors 41a and 41b detect this, and the meandering correction operation is performed. For example, as indicated by a solid line in FIG. 4B, when the sheet 2 meanders in the right direction in the right direction over the reference level, this is detected by the right displacement sensor 41b, and the sheet 2 is moved in the diagonally left direction. Only the first correction unit 21a to be corrected is driven. That is, the drive source 26 of the first correction unit 21 a is operated to advance the piston rod 33, the rotation block 24 is rotated, the first correction roller 20 a is lowered, and the left end portion of the surface of the sheet 2 is brought into contact. Since the first correction roller 20a is always urged downward by the spring material 32, the lower peripheral portion of the first correction roller 20a comes into elastic contact with the sheet 2 by the elasticity of the spring material 32, and the conveying force of the sheet 2 Rotate following. Since the driven rotation direction X ′ of the first correction roller 20a is determined in advance as the left oblique direction of the angle θ1, when the first correction roller 20a is driven to rotate following the driven rotation direction X ′, the sheet 2 is moved to the left oblique direction. By applying a tension force to pull, the meandering is corrected by moving the sheet 2 meandering on the right side to the left side. The progress of the meander correction is detected one by one by the displacement sensors 41a and 41b, and when the meander correction completion is detected, the driving of the first correction unit 21a is stopped and the first correction roller 20a is separated from the sheet 2.

  In addition, when the sheet 2 meanders in the left direction opposite to the solid line in FIG. 4B, the second displacement unit 41a detects this when the sheet 2 meanders above the reference level and corrects the sheet 2 in the diagonally right direction. Only 21b is driven, and only the second correction roller 20b is brought into contact with the right end portion of the surface of the sheet 2 and driven to rotate. In this case, since the driven rotation direction X ″ of the second correction roller 20b is determined to be the right diagonal direction, a tension force is applied to pull the sheet 2 in the right diagonal direction when the second correction roller 20b rotates. The meandering is corrected by moving the sheet 2 meandering to the left side to the right, and the progress of the meandering correction is detected one by one by the displacement sensors 41a and 41b, and when the completion of meandering correction is detected, the second The driving of the correction unit 21 b is stopped, and the second correction roller 20 b is separated from the sheet 2.

  When the sheet 2 meanders to the left or right, one of the pair of right and left correction rollers 20a and 20b is brought into contact with the sheet 2 and rotated to follow the meandering correction. When the amount of meandering of the sheet 2 is small, meandering correction can be performed by bringing one of the correction rollers 20a and 20b into contact with the sheet 2 for a short time. The meandering amount of the sheet 2 and the contact time of the correction roller are in a proportional relationship, and one of the correction rollers 20a and 20b is continuously brought into contact with the sheet 2 for a long time to correct the meander, and intermittently and a plurality of times a short time. It is possible to correct the meandering by touching them separately. Alternatively, the pair of right and left correction rollers 20a and 20b may be brought into contact with the sheet 2 alternately in a short time, and the meandering correction may be performed by gradually decreasing the left and right meandering of the sheet 2 in stages.

  When both of the pair of right and left correction rollers 20a and 20b come into contact with the sheet 2, and when the correction rollers 20a and 20b are separated from the sheet 2, the correction rollers 20a and 20b come into contact with the sheet 2 by the braking action of the attached brake members 30a and 30b. It does not run idle until it stops, and immediately stops rotating when it leaves the seat 2. Therefore, the correction rollers 20a and 20b immediately follow and rotate when they come into contact with the sheet 2 to start the operation of correcting the meandering of the sheet 2, and quickly and surely correct the meandering of the sheet. Further, when each of the correction rollers 20a and 20b is detached from the sheet 2, the correction rollers 20a and 20b immediately stop rotating and do not apply an excessive correction force to the meandering corrected sheet 2. The pair of right and left correction rollers 20 a and 20 b are in contact with the surface of the sheet 2 for correcting the meandering of the sheet 2 only in a narrow region at both ends in the width direction of the sheet 2. Since both end portions in the width direction of the surface of the sheet 2 are not used as sheet products formed with an electric circuit or the like on the surface, even if the correction rollers 20a and 20b come into contact with each other appropriately, problems such as quality deterioration may be caused. There is no. In other words, when processing the center part in the width direction of the surface of the sheet 2 and using it as a sheet product, it is possible to prevent an external member such as a correction roller from contacting the surface in the center part in the width direction. , Manufacturing yield is improved.

  Next, another embodiment will be described.

  FIG. 5 shows a meandering correction device in which a pair of first correction roller 20 a and second correction roller 20 b are arranged at one end of the surface of the sheet 2. Specifically, the first correction roller 20a whose driven rotation direction X ′ is diagonally left is arranged downstream of one end portion of the sheet 2, and the second correction roller 20b whose driven rotation direction X ′ is diagonally right is positioned on the sheet. It arrange | positions in the upstream of one edge part of 2. For example, when the sheet 2 meanders in the right direction, this is detected by the displacement sensors 41a and 41b, and the first correction roller 20a is brought into contact with the sheet 2 to perform an operation of correcting in the diagonally left direction. Meandering, the second correction roller 20b is brought into contact with the sheet 2 to perform an operation of correcting in the diagonally right direction. Even in this way, the left and right meandering of the sheet 2 is quickly corrected by the driven rotation of either of the front and rear correction rollers 20a and 20b.

  In FIG. 6, the first correction rollers 20 a each having the left and right driven rotational directions X ′ on the surface of the sheet 2 are arranged obliquely to the left, and further driven and rotated at the both lateral ends of the surface of the sheet 2. The second correction rollers 20b whose direction X ″ is diagonally right are arranged one by one. In this case, when the sheet 2 meanders in the right direction, for example, the pair of first correction rollers 20a and 20a arranged on the left and right are simultaneously provided. A tension is applied to the opposite ends of the sheet 2 to move it diagonally to the left from both ends, and when the sheet 2 meanders in the left direction, the pair of second correction rollers 20b and 20b arranged on the left and right are simultaneously moved. A tension is applied to both ends of the sheet 2 so as to move obliquely to the right from both ends, and such a meandering correction device is effective for the sheet 2 having a larger width.

  In FIG. 7, one correction roller 20 is disposed at one end in the width direction on the surface of the sheet 2. In this case, the single correction roller 20 includes a brake member 30, and the angle in the oblique direction with respect to the sheet conveying direction X when contacting the sheet 2 and driven to rotate can be switched in two stages. For example, as shown in FIG. 8, the center portion of the roller support shaft 25 of the correction roller 20 is connected to the rotation shaft 34, and the rear end of the roller support shaft 25 is moved back and forth in the horizontal direction by the cylinder 35. 25 is swung in the horizontal direction around the rotation shaft 34. With this swing, the correction roller 20 is moved back and forth between the solid line and the chain line in FIG. The solid-line correction roller 20 in FIG. 8 is in the diagonally left direction, and when it rotates in contact with the sheet 2, the sheet 2 is moved in the diagonally left direction to correct meandering. The correction roller 20 of the chain line in FIG. 8 is in the right oblique direction, and when it rotates in contact with the sheet 2, the sheet 2 is moved in the right oblique direction to correct meandering.

  Note that the sheet meandering correction device of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

It is a top view of the principal part which shows embodiment. It is a perspective view of the principal part of FIG. It is a partial front view of the principal part of FIG. (A) is a top view which shows the outline | summary of the meandering correction apparatus of FIG. 1, (B) is a top view at the time of meandering correction | amendment operation | movement. It is a top view of the principal part which shows other embodiment. It is a top view of the principal part which shows other embodiment. It is a top view of the principal part which shows other embodiment. It is an enlarged plan view of the principal part of FIG. (A) is a side view of a general sheet conveying apparatus, and (B) is a partial plan view of a sheet. It is a perspective view of the conventional sheet meandering correction device.

Explanation of symbols

2 Sheet 20 Correction roller 20a First correction roller 20b Second correction roller 21a First correction unit 21b Second correction unit 22 Base 23 Oscillating block 24 Rotating block 25 Roller spindle 26 Drive source 28 Connection adjusting shaft 29 Balancer 30 Brake Member 30a, 30b Brake member 41a, 41b Displacement sensor

Claims (7)

One side of the sheet conveyed in the sheet length direction can be moved away from the fixed direction from the fixed direction, and when it comes into local contact with the sheet, it is driven to rotate in an oblique direction that is not parallel to the predetermined conveyance direction of the sheet and the sheet conveyance direction is A correction roller for correcting in the direction, and a displacement sensor for detecting the presence or absence of meandering on the left and right in the width direction of the sheet,
A sheet meandering correction method comprising: bringing the correction roller into contact with a sheet with a meandering signal of the displacement sensor; and releasing the correction roller from the sheet with a meandering-free signal.   The correction roller includes a pair of first correction roller and second correction roller that are driven to rotate in an oblique direction different from a right oblique direction and a left oblique direction that are not parallel to a predetermined conveyance direction of the sheet, and from the displacement sensor 2. The sheet meandering according to claim 1, wherein the presence / absence of contact between the first correction roller and the sheet and the second correction roller and the sheet is controlled based on a detection signal of the presence / absence of meandering. Correction method.   The sheet meandering correction method according to claim 2, wherein the first correction roller and the second correction roller are arranged separately at both ends in the width direction of the sheet.   3. The sheet meandering correction method according to claim 2, wherein the first correction roller and the second correction roller are separately arranged at one end in the width direction of the sheet. One side of the sheet conveyed in the sheet length direction can be moved away from the fixed direction from the fixed direction, and when it comes into local contact with the sheet, it is driven to rotate in an oblique direction that is not parallel to the predetermined conveyance direction of the sheet and the sheet conveyance direction is A correction unit having a correction roller for correcting in the direction, and a displacement sensor for detecting the presence or absence of meandering on the left and right in the width direction of the sheet,
The correction unit includes a base at a fixed position, a swing block connected to the base so as to be swingable in a direction parallel to one surface of the sheet, and the swing block orthogonal to the swing direction of the swing block. A rotation block connected to be rotatable in a direction, the correction roller rotatably supported by the rotation block, and the correction roller being fixed to the base so that the correction roller approaches and leaves the sheet. A sheet meandering correction apparatus comprising a drive source that rotates in a moving direction.   The correction unit has a pair of similar first correction unit and second correction unit, and the pair is driven in an oblique direction different from the right oblique direction and the left oblique direction that are not parallel to the predetermined conveyance direction of the sheet. 6. The sheet meandering correction apparatus according to claim 5, wherein a rotating first correction roller and a second correction roller are provided.   The sheet meandering correction apparatus according to claim 5 or 6, wherein a brake member for restricting idle rotation of the correction roller is attached to the correction roller.

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