JP6511184B1 - Sheet inspection machine - Google Patents

Abstract

To provide a sheet material inspection machine capable of sending a label replaced by a processing unit to an inspection unit and inspecting the label even if it has a slitter unit. An inspection apparatus includes an unwinding unit having an unwinding shaft rotatable in an unwinding direction and a winding direction, an inspection unit inspecting a label of a sheet-like material unwound from the unwinding unit, and inspection A processing unit for replacing a label determined to be defective in the processing unit, a slitter unit provided on the downstream side of the processing unit in the sheet conveyance direction and cutting a sheet, and a buffer unit for accumulating the sheet The sheet material can be delivered to the upstream side in the conveyance direction with the conveyance of the sheet material downstream from the buffer section stopped, and the sheet material having a length capable of sending the replaced label to the inspection section can be released. A buffer unit for storing the sheet material in the buffer unit, enabling the sheet material accumulated in the buffer unit to be discharged, and rotating the unwinding shaft in the winding direction to wind the sheet material; Can be transported upstream A. [Selected figure] Figure 1

Description

  The present invention relates to a sheet material inspection machine.

Conventionally, a sheet material inspection machine disclosed in Patent Document 1 is known.
The sheet material inspection machine disclosed in Patent Document 1 is a machine for inspecting a label of a sheet material. This inspection machine has an unwinding part on one side and a winding part on the other side, and the sheet can be conveyed from the unwinding part toward the winding part. Between the unwinding unit and the winding unit, an inspection unit, a processing unit, and a slitter unit are provided in order from the upstream of the sheet conveyance direction.

At the unwinding portion, a sheet roll in which a sheet-like material is rolled up is mounted, and the sheet-like material is unwound from the sheet roll. The unrolled sheet is inspected in the inspection section to determine whether the label is defective. If there is no abnormality in the label, the sheet-like material passes through the processing unit, is cut at the slitter unit, and then wound at the winding unit.
On the other hand, when there is a label determined to be defective in the inspection unit, when the defective label reaches the processing unit, the conveyance of the sheet is stopped, and the defective label is replaced with another label in the processing unit. Thereafter, the conveyance of the sheet is resumed.

Patent No. 4456647 gazette

Conventionally, there is a demand that the inspection unit again inspects the label replaced by the processing unit. In order to inspect the replaced label in the inspection unit, it is necessary to convey the sheet to the upstream side in the sheet conveying direction and send the replaced label to the inspection unit.
However, since the slitter unit is provided downstream of the processing unit in the sheet conveyance direction, when the sheet is conveyed upstream in the sheet conveyance direction in order to send the label replaced by the processing unit to the inspection unit, the slitter cuts the sheet. The cut portion of the sheet-like material is also conveyed upstream in the sheet conveyance direction through the slitter portion.

  Therefore, in the conventional sheet material inspection machine, after the sheet material is conveyed to the upstream side in the sheet conveying direction and the label replaced by the processing unit is sent to the inspection unit, the sheet material is conveyed in the sheet conveyance direction. When reopened, there arises a problem that the cut portion of the sheet-like material cut by the slitter passes through the slitter again. Therefore, in the conventional sheet material inspection machine, the label replaced by the processing unit can not be sent to the inspection unit for inspection, and it can be judged only by visual inspection whether the replaced label is good or not. could not.

  Therefore, in view of the above problems, the present invention provides a sheet material inspection machine capable of sending a label replaced by a processing unit to an inspection unit and inspecting even a sheet material inspection apparatus having a slitter unit. The purpose is to

A sheet inspection apparatus according to an aspect of the present invention includes an unwinding shaft rotatable in a unwinding direction for unwinding a sheet-like article provided with labels arranged in a longitudinal direction and a winding direction for unwinding a sheet-like article. An inspection unit for inspecting whether or not the label of the sheet-like material unwound from the unwinding unit and conveyed in the sheet conveying direction is defective; and the sheet conveying direction of the inspection unit A processing unit provided on the downstream side for replacing a label judged to be defective in the inspection unit, and provided on the downstream side of the processing unit in the sheet conveyance direction, the sheet material along the sheet conveyance direction A slitter unit for cutting, a buffer unit provided between the processing unit and the slitter unit for accumulating the sheet-like material, and the conveyance of the sheet-like material downstream from the buffer unit in the sheet conveyance direction Stopped And a buffer unit for releasably accumulating the sheet material having such a length that the sheet material can be conveyed upstream in the sheet conveying direction and the replaced label can be sent to the inspection unit, The sheet-like material accumulated in the buffer unit can be discharged from the buffer unit, and the winding shaft is rotated in the winding direction to wind the sheet-like material upstream of the sheet conveying direction. Can be transported to

Further, the sheet material inspection machine includes a control device that controls the unwinding shaft and the buffer unit, and the buffer unit is movable in a direction of approaching and separating from the plurality of rotating rollers and the rotating rollers. A plurality of dancer rollers are provided, and sheet materials can be accumulated by alternately winding sheet materials around the plurality of rotating rollers and the plurality of dancer rollers, and the dancer rollers are brought close to the rotating rollers. The sheet-like material can be released by moving in the direction, and the control device can release the sheet-like material that can be released from the buffer unit when sending the replaced label to the inspection unit, and The moving speed of the dancer roller in the direction approaching the rotating roller and the unwinding shaft so that the conveying amount of the sheet-like material conveyed to the unwinding portion is substantially the same. Controlling at least one of the speed of the winding direction of the rotational speed.
Further, the sheet material inspection machine includes a dancer unit for maintaining the tension of the sheet material between the buffer unit and the slitter unit.

  The dancer unit further includes a winding roller around which the sheet is wound and which can be displaced in the tension direction and the slack direction of the sheet, and a displacement sensor that detects the position of the winding roller. The control device controls the moving speed of the dancer roller in the direction in which the winding roller approaches the rotating roller and the winding direction of the unwinding shaft so that the winding roller maintains a predetermined position based on the detection result of the displacement sensor. Control at least one of the speed of rotation and the speed of rotation.

  Further, the dancer portion is a winding roller on which the sheet-like material is wound and which can be displaced in the tension direction and the slack direction of the sheet-like material, and a bias for urging the winding roller in the tension direction of the sheet-like material A device that is capable of releasing the sheet-like material that can be discharged from the buffer unit, and the amount of conveyance of the sheet-like material conveyed to the unwinding unit; The tension of the sheet is maintained by displacing the roller within a predetermined range.

  Further, the biasing device is constituted by an air cylinder disposed laterally above the buffer portion.

  According to the above configuration, after replacing the defective label with another label in the processing unit, the sheet material accumulated in the buffer unit can be released from the buffer unit and the unwinding shaft is rotated in the winding direction. Take up the sheet. Then, the sheet-like material accumulated in the buffer unit is conveyed from the buffer unit to the upstream side in the sheet conveyance direction. Thus, the replaced label can be sent to the inspection unit in a state in which the conveyance of the sheet-like material on the downstream side in the sheet conveyance direction from the buffer unit is stopped. That is, the replaced label can be sent to the inspection unit for inspection without the cut portion cut at the slitter portion being transported backward.

  In addition, when sending the replaced label to the inspection unit, the sheet-like material capable of being discharged from the buffer unit is wound by the unwinding unit, so the sheet-like material can be inserted between the unwinding unit and the inspection unit. There is no need to separately provide a device for reverse transport.

It is a schematic front view of a sheet-like thing inspection machine. It is a top view of a sheet-like thing. It is a front view from a unwinding part to a process part. It is a front view of the winding part side. It is a front view of a buffer part and a dancer part. It is a top view of a buffer part. It is a top view of a dancer part.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a schematic front view of a sheet material inspection machine 1 according to the present embodiment. The sheet material inspection machine 1 is a machine for inspecting whether or not each label 2 in the sheet material 3 (see FIG. 2) provided with the labels 2 arranged in the longitudinal direction L (hereinafter referred to as sheet material inspection) Machine 1 simply inspection machine 1
Also called). Further, the inspection machine 1 is an inspection machine 1 having a slitter portion 4 which cuts the sheet-like material 3 after inspection along the longitudinal direction L.

As shown in FIG. 2, the sheet-like material 3 is a continuous sheet on which the labels 2 are attached at regular intervals in the longitudinal direction L of the band-like backing sheet 3A (release paper or the like). In the present embodiment, a plurality of label rows (three rows in the illustrated example) are provided in the width direction W of the backing sheet in which the labels 2 are arranged in the longitudinal direction L of the backing sheet. The surface of each label 2 is printed.
The label 2 being defective is, for example, that the label 2 has stains on printing, foreign matter adhesion, distortion, chipping, positional deviation, falling off, unevenness in density, clogging, pinholes, voids, burrs, etc. .

As shown in FIG. 1, the inspection machine 1 has a machine frame 5 and, at one side portion (left side portion in FIG. 1) of the machine frame 5, has an unwinding portion 6 in which the sheet-like material 3 is unwound. . In the unwinding portion 6, a sheet roll 6A in which the sheet-like material 3 is taken up in a roll shape is set. In the unwinding portion 6, an unwinding shaft 7 on which the sheet roll 6A is mounted is rotatably provided.
As shown in FIG. 3, the unwinding unit 6 is provided with a drive motor (referred to as a first drive motor) M1 that is a drive device that rotationally drives the unwinding shaft 7. The rotational power of the first drive motor M1 is transmitted to the unwinding shaft 7 via a first transmission mechanism (winding transmission mechanism) T1. That is, the unwinding shaft 7 is rotated by the power of the first drive motor M1. The first drive motor M1 is capable of rotating in the forward and reverse directions. For example, the first drive motor M1 rotates the unwinding shaft 7 in the direction indicated by the arrow b1 by normal rotation, and rotates the unwinding shaft 7 in the direction indicated by the arrow b2 by reverse rotation.

  On the unwinding shaft 7, an outer winding type sheet roll 6A or an inner winding type sheet roll 6A is mounted. The "outer winding type sheet roll 6A" is obtained by winding the sheet-like material 3 in a form in which the label 2 is on the front side (outside) of the roll and finishing in a roll shape. The "in-roll type sheet roll 6A" is obtained by winding the sheet 3 in a form in which the label 2 is on the back side (inside) and finishing it into a roll.

  In the case of the sheet roll 6A of the outer winding type, the sheet 3 is wound around the first guide roller G1 as shown by a solid line in FIG. In the case of the sheet roll 6A of the outer winding type, the sheet roll 6A is rotated in the unwinding direction to unroll the sheet 3 by the rotation of the unwinding shaft 7 in the direction indicated by the arrow b1. Is unrolled. Further, when the unwinding shaft 7 rotates in the direction indicated by the arrow b2, the sheet roll 6A rotates in the winding direction in which the sheet 3 is wound, and the sheet 3 is wound.

  On the other hand, in the case of the internally wound sheet roll 6A, the sheet-like material 3 is wound around the first guide roller G1 as shown by a two-dot chain line in FIG. In the case of the internally wound type sheet roll 6A, when the unwinding shaft 7 rotates in the direction indicated by the arrow b1, the sheet roll 6A rotates in the winding direction to wind up the sheet 3 and the sheet 3 Is taken up. Further, when the unwinding shaft 7 is rotated in the direction indicated by the arrow b2, the sheet roll 6A is rotated in the unwinding direction of the sheet 3 and the sheet 3 is unwound.

The first drive motor M1 is connected to the main control unit 9 provided in the inspection machine 1. The main control unit 9 controls the rotation direction and the number of rotations of the first drive motor M1. The main control unit 9 is configured using, for example, a microcomputer provided with a CPU, an EEPROM, and the like.
As shown in FIG. 1, the inspection machine 1 has a winding unit 11 that winds the sheet 3 on the other side (right side in FIG. 1) of the machine frame 5. As shown in FIG. 4, the winding unit 11 includes a winding shaft 12 that winds the sheet 3 and a drive motor (second drive motor) M2 that is a driving device that rotationally drives the winding shaft 12. The rotational power of the second drive motor M2 is transmitted to the winding shaft 12 via the second transmission mechanism T2. That is, the winding shaft 12 is rotated by the power of the second drive motor M2. The second drive motor M2 is connected to the main control unit 9 and is controlled by the main control unit 9.

For example, when the second drive motor M2 rotates in the normal direction, the winding shaft 12 rotates in a direction in which the sheet 3 is wound. The drive motor M2 may be capable of rotating in the forward and reverse directions. Since the drive motor M2 is capable of rotating in the forward and reverse directions, the sheet-like material 3 can be wound on an externally wound type or internally wound type roll. The term "rolling on an externally wound type roll" means to wind the sheet 3 in a roll with the label 2 being on the front side (outside) of the roll, and "rolled on an internally wound type roll" The term "rolling up" the sheet 3 in the form of a roll with the label 2 being on the back side (inner side) of the roll.

  When the sheet 3 is wound on an externally wound type roll, as shown by a solid line in FIG. 4, the sheet 3 is wound around a sixteenth guide roller G16, and the drive motor M2 is rotated forward. When the sheet 3 is wound on an internally wound type roll, the sheet 3 is wound around a sixteenth guide roller G16 and a seventeenth guide roller G17 as shown by a two-dot chain line in FIG. The drive motor M2 is reversely rotated.

  As shown in FIG. 1, the sheet-like material 3 unwound from the unwinding unit 6 is driven by a plurality of drive rollers (first drive roller D1 to fourth drive roller D4) and wound up from the unwinding unit 6 The sheet is conveyed in the sheet conveying direction A, which is a direction toward the portion 11, and guided by a plurality of guide rollers (first to sixteenth guide rollers G1 to G16 or first to seventeenth guide rollers G1 to G17). It reaches the winding unit 11 and is wound by the winding unit 11.

  As shown in FIG. 3, in the vicinity of the first driving roller D1, a first pressing roller P1 for pressing the sheet 3 against the first driving roller D1 is provided. In the vicinity of the second driving roller D2, a second pressing roller P2 for pressing the sheet 3 against the second driving roller D2 is provided. The first drive roller D1 and the second drive roller D2 are rotationally driven by a drive motor (referred to as a third drive motor) M3 which is a drive device. The power of the third drive motor M3 is transmitted to the first drive roller D1 and the second drive roller D2 via the third transmission mechanism T3. The third drive motor M3 is capable of rotating in the forward and reverse directions, and rotates the sheet 3 in the sheet conveying direction A downstream side by forward rotation (in the following description, the downstream side of the sheet conveying direction A is also simply referred to as the downstream side). The first drive roller D1 and the second drive roller D2 are rotated so as to be transported, and the sheet 3 in the sheet transport direction A upstream side which is the reverse direction of the sheet transport direction A by rotating in reverse. The first drive roller D1 and the second drive roller D2 are rotated such that the upstream side in the transport direction A is also simply transported upstream).

In this embodiment, since the unwinding shaft 7 and the first drive roller D1 and the second drive roller D2 are driven by different drive motors, the case of using the sheet roll 6A of the outer winding type and The case of using the internally wound sheet roll 6A can be easily coped with.
As described above, when the sheet roll 6A of the outer winding type is used, the rotation direction of the unwinding shaft 7 is the b1 direction when the sheet 3 is unwound, and the b2 direction when the sheet 3 is wound. When the sheet roll 6A of the inner winding type is used, the rotation direction of the unwinding shaft 7 is the b2 direction when the sheet 3 is unwound, and the b1 direction when the sheet 3 is wound. That is, the rotation direction of the unwinding shaft 7 differs between when the sheet-like material 3 is unwound and when the sheet-like material 3 is unwound between the case of using the outer winding type sheet roll 6A and the case of using the inner winding type sheet roll 6A. . On the other hand, the rotational directions of the first drive roller D1 and the second drive roller D2 are the same in the case of using the sheet roll 6A of the outer winding type and in the case of using the sheet roll 6A of the inner winding type.

Therefore, when the winding direction of the unwinding shaft 7 is used by using the sheet roll 6A of the outer winding type by separately driving the unwinding shaft 7 and the first drive roller D1 and the second drive roller D2. It is possible to easily cope with the case of using the internally wound type sheet roll 6A.
The unwinding shaft 7, the first drive roller D1, and the second drive roller D2 may be driven by one drive motor. In this case, the drive motor is capable of rotating in the forward and reverse directions, and a rotation direction switching mechanism for transmitting the power in the forward and reverse directions to the power transmission system for transmitting the power from the drive motor to the unwinding shaft 7 is necessary. It is.

As shown in FIG. 3, above the unwinding portion 6, a first tension detector 13 that detects the tension of the sheet 3 is provided. The first tension detector 13 is connected to the main control unit 9. The first drive motor M1 and the third drive motor M3 are controlled based on the detection result of the first tension detector 13 so as to keep the tension of the sheet 3 constant (at a predetermined tension).

  As shown in FIG. 4, in the vicinity of the third driving roller D3, a third pressing roller P3 for pressing the sheet 3 to the third driving roller D3 is provided. In the vicinity of the fourth driving roller D4, a fourth pressing roller P4 for pressing the sheet 3 against the fourth driving roller D4 is provided. The third drive roller D3, the fourth drive roller D4, and the slitter unit 4 are rotationally driven by a drive motor (referred to as a fourth drive motor) M4 which is a drive device.

The rotational power of the fourth drive motor M4 is transmitted to the third drive roller D3 via the fourth transmission mechanism T4, and the fourth drive roller D4 and slitter via the fifth transmission mechanism T5 and the sixth transmission mechanism T6. It is transmitted to the part 4.
In this embodiment, since the winding shaft 12, the third drive roller D3, the fourth drive roller D4, and the slitter 4 are driven by another drive motor, the sheet 3 is wound around the outside. It is possible to easily cope with the case of winding on a roll and the case of winding on an internally wound type roll.

That is, although the direction of rotation of the winding shaft 12 differs depending on whether the sheet 3 is wound on the outer winding type roll or the inner winding type roll, the third drive roller D3, the fourth drive roller The rotational directions of D4 and the slitter portion 4 are the same as in the case of winding on an outer winding type roll and in the case of winding on an inner winding type roll.
Therefore, by separately driving the winding shaft 12, the third drive roller D3 and the fourth drive roller D4, and the slitter unit 4, the direction of rotation of the winding shaft 12 is wound on an externally wound type roll. It is possible to easily cope with the case of taking and the case of winding on an internally wound type roll.

  As shown in FIG. 4, a second tension detector 14 that detects the tension of the sheet 3 is provided above the winding unit 11. The second tension detector 14 is connected to the main control unit 9. The second drive motor M2 and the fourth drive motor M4 are controlled based on the detection result of the second tension detector 14 so as to keep the tension of the sheet 3 constant (at a predetermined tension).

As shown in FIG. 1, the inspection machine 1 includes an inspection unit 16, a processing unit 17, and a slitter unit 4 between the unwinding unit 6 and the winding unit 11. The inspection unit 16 is disposed downstream of the unwinding unit 6. The processing unit 17 is disposed downstream of the inspection unit 16. The slitter unit 4 is disposed downstream of the processing unit 17.
The inspection unit 16 is a place to inspect whether or not the label 2 of the sheet 3 is defective. The inspection unit 16 is provided on the downstream side of the first drive roller D1. The inspection unit 16 determines whether the label 2 is defective based on the imaging device 18 that captures an image of the surface (upper surface) of the label 2 of the sheet 3 and the image information captured by the imaging device 18. A camera control unit 19 having a head, and a dome illumination 20 for illuminating the detection site of the label 2.

  The imaging device 18 is, for example, a line scan type CCD camera, and labels 2 by continuously joining pixels in one line orthogonal to the sheet conveyance direction A of the sheet 3 in the sheet conveyance direction A. Get an image of the surface of the. Further, the imaging device 18 is attached vertically downward to the upper end portion of the support member provided upright on the machine frame 5 so that the lens portion of the imaging device 18 faces the detection site X of the label 2. That is, a straight line Y connecting the focal point of the imaging device 18 and the detection site X is vertically downward.

  The camera control unit 19 is configured, for example, using a microcomputer provided with a CPU, an EEPROM, and the like. As shown in FIG. 1, an imaging device 18 is connected to the camera control unit 19. Further, the camera control unit 19 is connected to the main control unit 9. The camera control unit 19 and the main control unit 9 constitute a control device 21 of the inspection machine 1. Control device 21 may be constituted by one control unit, and may have three or more control units.

The camera control unit 19 determines whether each label 2 is defective or not by comparing the image information of each label 2 acquired by the imaging device 18 with the reference image of the label 2, that is, the non-defective image. . The inspection unit 16 also has an encoder (not shown) that monitors the speed of the conveyance line of the sheet 3. The output signal of the encoder is input to the camera control unit 19. The camera control unit 19 can monitor (acknowledge) the position of the label 2 determined to be defective (the position of the sheet 3 on the transport line) based on the output signal of the encoder. The signal input to the camera control unit 19 is sent to the main control unit 9.

The camera control unit 19 may have a determination unit that determines whether at least the label 2 is defective. A position monitoring unit that monitors the position of the label 2 may be provided in the main control unit 9.
As shown in FIG. 3, the dome illumination 20 is disposed below the support member 22 fixed to the machine frame 5 and above the detection site X of the label 2, and the inspection operation of the label 2 of the sheet 3 In the middle, the detection site X of the sheet 3 is exposed continuously.

As shown in FIG. 1, a first meandering correction device 23 for correcting meandering of the sheet 3 is provided on the upstream side of the inspection unit 16. The first meandering correction device 23 is disposed downstream of the first tension detector 13 and above the unwinding portion 6. Further, on the upstream side of the slitter portion 4, a second meandering correction device 24 for correcting meandering of the sheet 3 is provided.
As shown in FIG. 1, the processing unit 17 is a part for replacing (re-attaching) the label 2 determined to be defective by the inspection unit 16 with another label 2. The processing unit 17 is provided substantially at the center of the machine frame 5 and downstream of the second drive roller D2. The processing unit 17 also has a processing table (table) 17A for sending the sheet 3 in the horizontal direction. The sheet 3 is movable on the processing table 17A downstream and upstream of the sheet conveyance direction A. The upper side of the processing table 17A is open, and the operator can replace the label 2 and view the sheet 3 from above the processing table 17A.

When the label 2 determined to be defective by the inspection unit 16 reaches the processing table 17A, the main control unit 9 stops the driving of the first drive motor M1 to the fourth drive motor M4. When the conveyance of the sheet-like material 3 is stopped, the operator can perform processing of replacing the label 2 determined to be defective with another label 2.
The sixth guide roller G6 to the ninth guide roller G9 disposed between the inspection unit 16 and the processing unit 17 have a distance (time) until the defective label 2 detected by the inspection unit 16 reaches the processing unit 17 The route forming unit 25 is configured to create a route for earning. The seventh guide roller G7 is disposed below the sixth guide roller G6 and the eighth guide roller G8, and the ninth guide roller G9 is provided below the eighth guide roller G8 and the second drive roller D2. ing. Thus, the path forming unit 25 can be formed compact in the sheet conveying direction A.

  The slitter portion 4 is a portion for cutting the sheet 3 along the sheet conveying direction A between the label rows. The slitter portion 4 has a slitter lower blade 4A positioned below the sheet 3 and a slitter upper blade 4B positioned above the sheet 3. The slitter lower blade 4A is driven by a fourth drive motor M4. The slitter upper blade 4B is pivotably supported by the machine frame 5 via a link and pressed against the slitter lower blade 4A. The sheet 3 is sandwiched from above and below by the slitter lower blade 4A and the slitter upper blade 4B, and is cut along the sheet conveying direction A. The sheet 3 cut by the slitter 4 is taken up by the take-up unit 11.

In addition, the sheet-like material 3 can be in a state not to be cut by swinging the slitter upper blade 4B upward and holding it at a position swinged upward.
As shown in FIG. 1, a buffer unit 26 and a dancer unit (air dancer unit) 27 are provided between the processing unit 17 and the slitter unit 4 (between the conveyance path of the sheet 3). . The buffer unit 26 is provided between the processing unit 17 and the dancer unit 27, and the dancer unit 27 is provided between the buffer unit 26 and the slitter unit 4. Also, the dancer unit 27 is disposed above the buffer unit 26, and the second meandering correction device 24 is disposed above the dancer unit 27.

The buffer unit 26 is a device that accumulates and releases the sheet 3. The buffer unit 26 can accumulate at least the sheet-like material 3 of such a length that the label 2 replaced by the processing unit 17 can be sent to the inspection unit 16. Further, the buffer unit 26 can discharge the sheet-like material 3 from the buffer unit 26 so that the accumulated sheet-like material 3 can be transported upstream from the buffer unit 26.

Next, the buffer unit 26 will be specifically described with reference to FIGS. 5 and 6. In the following description, the left-right direction is the direction (right) from one side (left side) to the other side (right side) of the inspection machine 1 in FIG. 1 and the opposite direction (left) thereof. Say the direction. The horizontal direction orthogonal to the left-right direction is referred to as the front-rear direction.
The buffer unit 26 has a support frame (not shown) provided inside the machine frame 5. In FIG. 5, reference numeral 28 denotes an opening provided in the machine frame 5, and the buffer unit 26 is visible from the outside through the opening 28.

  The buffer unit 26 includes a plurality of rotating rollers (first to fifth rotating rollers 29a to 29e) and a plurality of dancer rollers (first to fourth dancer rollers 30a to 30d). The plurality of rotation rollers 29 a to 29 e are arranged in the left and right direction below the buffer unit 26. Each of the rotating rollers 29a to 29e is rotatably supported by the support frame about a longitudinal axis. In addition, each of the rotation rollers 29a to 29e can not move in the vertical direction. The plurality of dancer rollers 30a to 30d are disposed above the plurality of rotating rollers 29a to 29e. One dancer roller is disposed above each other between the adjacent rotating rollers.

  Specifically, the first dancer roller 30a is disposed above the first rotation roller 29a and the second rotation roller 29b, and the second dancer roller 30b is disposed above the second rotation roller 29b and the third rotation roller 29c. 30b are disposed, and a third dancer roller 30c is disposed above the third roller 29c and the fourth roller 29d, and a fourth dancer roller 30c is disposed above the fourth roller 29d and the fifth roller 29e. A dancer roller 30d is disposed.

  The sheet-like material 3 is wound alternately and sequentially on the plurality of rotating rollers 29a to 29e and the plurality of dancer rollers 30a to 30d. Specifically, the sheet 3 conveyed in the sheet conveyance direction A from the tenth guide roller G10 is wound around the lower surface side of the first rotation roller 29a, and conveyed in the sheet conveyance direction A from the first rotation roller 29a. The sheet 3 to be formed is wound on the upper surface side of the first dancer roller 30a. The sheet 3 conveyed from the first dancer roller 30a in the sheet conveying direction A is wound around the lower surface of the second rotating roller 29b, and conveyed from the second rotating roller 29b in the sheet conveying direction A. The sheet 3 is wound on the upper surface side of the second dancer roller 30b. The sheet 3 conveyed in the sheet conveyance direction A from the second dancer roller 30b is wound around the lower surface of the third rotation roller 29c, and conveyed in the sheet conveyance direction A from the third rotation roller 29c. The sheet 3 is wound on the upper surface side of the third dancer roller 30c. The sheet 3 conveyed in the sheet conveyance direction A from the third dancer roller 30c is wound around the lower surface of the fourth rotation roller 29d, and conveyed in the sheet conveyance direction A from the fourth rotation roller 29d. The sheet 3 is wound on the upper surface side of the fourth dancer roller 30d. The sheet 3 conveyed in the sheet conveyance direction A from the fourth dancer roller 30d is wound around the lower surface of the fifth rotation roller 29e, and conveyed in the sheet conveyance direction A from the fifth rotation roller 29e. The sheet 3 is wound around an eleventh guide roller G11.

  As described above, the sheet portion 3 is alternately and sequentially wound over the plurality of rotation rollers 29 and the plurality of dancer rollers 30, so that the buffer unit 26 (the plurality of rotation rollers 29a to 29e and the plurality of dancer rollers 30a to 30 The sheet 3 can be accumulated between 30 d and 30 d). Further, by moving the plurality of dancer rollers 30a to 30d downward simultaneously, the accumulated sheet-like material 3 can be released from the buffer unit 26.

In the buffer unit 26, the position (straight line Y and the fourth guide roller G 4) where the sheet 3 can be conveyed upstream and the label 2 replaced by the processing unit 17 can be inspected by the inspection unit 16. It is possible at least to accumulate sheet-like objects 3 of a length which can be fed up (upstream of the point of intersection).
As shown in FIGS. 5 and 6, the buffer unit 26 has a movable frame 31. The movable frame 31 has a first frame 31A disposed in front of the dancer rollers 30a to 30d and a second frame 31B disposed behind the dancer rollers 30a to 30d. The dancer rollers 30a to 30d are rotatably supported by the first frame 31A and the second frame 31B (movable frame 31) around the front and rear axes.

  The first frame 31A has a pair of front and rear sliders 32. The second frame 31 B also has a pair of front and rear sliders 32. The buffer unit 26 has four vertical slide rails 33 for supporting the sliders 32 so as to be able to move up and down. As the slider 32 moves up and down along the vertical slide rail 33, the plurality of dancer rollers 30a to 30d move up and down together. That is, the plurality of dancer rollers 30a to 30d can move in the approaching and separating directions with respect to the plurality of rotating rollers 29a to 29e.

  At the front of the first frame 31A, a first screw rod 34A having an axial center extending in the vertical direction is provided. At the rear of the second frame 31B, a second screw rod 34B having an axial center extending in the vertical direction is provided. The first screw rod 34A and the second screw rod 34B are wedge members in which male threads are formed on the outer peripheral surface of the rod. The first screw rod 34A and the second screw rod 34B are rotatably supported by the support frame about an axis in the vertical direction. The first lifting member 35A attached to the first frame 31A is screwed into the first screw rod 34A, and the second lifting member 35B attached to the second frame 31B is screwed into the second screw rod 34B. It is done.

  A drive motor (referred to as a fifth drive motor) M5, which is a drive device for rotationally driving the first screw rod 34A and the second screw rod 34B, is provided on the upper portion of the support frame. The fifth drive motor M5 is capable of rotating in the forward and reverse directions. The rotational power of the fifth drive motor M5 is transmitted to the first screw rod 34A via the seventh transmission mechanism T7 and is transmitted to the second screw rod 34B via the eighth transmission mechanism T8. That is, the first screw rod 34A and the second screw rod 34B rotate about the axial center by the power of the fifth drive motor M5. The movable frame 31 and the plurality of dancer rollers 30a to 30d move up and down together by rotating the first screw rod 34A and the second screw rod 34B around their axes. The fifth drive motor M5 is connected to the main control unit 9, and the main control unit 9 controls the rotational direction and the number of rotations.

As shown in FIGS. 5 and 7, the dancer unit 27 is a winding roller 36 on which the sheet 3 is wound, and a displacement sensor (linear displacement) that detects (measures) the position (displacement) of the winding roller 36. A sensor 37 and a biasing device 38 for biasing the winding roller 36 in the tension direction of the sheet 3.
First, the outline of the dancer unit 27 will be described. The dancer unit 27 is a device for maintaining the tension of the sheet 3 between the buffer unit 26 and the slitter unit 4. The winding roller 36 is displaceable in the tension direction and the slack direction of the sheet 3. The biasing device 38 is constituted by, for example, an air cylinder (actuator). The air cylinder 38 is disposed laterally above the buffer unit 26 (along the left-right direction in the present embodiment). The displacement sensor 37 is constituted by, for example, a linear sliding potentiometer, and detects the linear displacement of the winding roller 36.

Next, the dancer unit 27 will be described in detail.
The winding roller 36 has an axial center extending in the front-rear direction. On the left side of the winding roller 36, a twelfth guide roller G12 and a third drive roller D3 are arranged vertically. On the right side of the winding roller 36, a sheet 3 conveyed in the sheet conveying direction A from the twelfth guide roller G12 to the third driving roller D3 is wound.

  A front slide member 39A is provided on the front side of the winding roller 36, and a rear slide member 39B is provided on the rear side of the winding roller 36. The winding roller 36 is rotatably supported by the front slide member 39A and the rear slide member 39B about the longitudinal axis. The front slide member 39A is supported by a front guide rail 40A disposed on the front side of the winding roller 36 so as to be movable leftward and rightward. The rear slide member 39B is disposed on the rear side of the winding roller 36, and is supported movably to the left and right by a guide rail 40B. Thus, the winding roller 36 is movable in the lateral direction, and the winding roller 36 is movable in the stretching direction and the slack direction of the sheet 3 by moving in the lateral direction.

The displacement sensor 37 is connected to the main control unit 9. Air cylinder 3
The rod side of the cylinder body 38 a is rotatably supported by a bracket member 42 fixed to the machine frame 5 so as to be rotatable about its longitudinal axis. The tip end side of the piston rod 38 b of the air cylinder 38 is connected to the front slide member 39 A and the rear slide member 39 B via the connection member 41. The air cylinder 38 biases the winding roller 36 rightward (pulling rightward) by supplying air of a predetermined pressure into the cylinder body 38a. The air cylinder 38 (dancer unit 27) is a device that generates tension applied to the sheet 3 and, by making the air pressure of the air cylinder 38 constant, the second drive roller D2 and the third drive roller D3. The tension of the sheet-like material 3 in between is made. The air supply device for supplying air to the air cylinder 38 includes an electro-pneumatic converter controlled by the main control unit 9 and supplies air to the air cylinder 38 at a pressure corresponding to a desired tension. Thereby, a predetermined tension is applied to the sheet 3. The set pressure of the air supplied to the air cylinder 38 can be changed by the main control unit 9.

When tension above the predetermined level acts on the sheet 3 between the buffer unit 26 and the slitter unit 4, the winding roller 36 moves to the left (in the slack direction). As a result, even if the tension of the sheet 3 is increased beyond the tension set by the air cylinder 38, the winding roller 36 is displaced in the slack direction to absorb the increase in tension.
In addition, when the tension of the sheet 3 is less than a predetermined value (decreased by a predetermined amount or more) between the buffer unit 26 and the slitter unit 4, the winding roller 36 moves in the right direction (tension direction). As a result, even if the tension of the sheet 3 is reduced below the tension set by the air cylinder 38, the winding roller 36 is displaced in the tension direction to absorb the reduction in tension.

  From the above, the dancer unit 27 absorbs the change in the predetermined range of the tension of the sheet 3 and maintains the tension of the sheet 3 at the predetermined tension. Further, even if the winding roller 36 moves a little, the tension of the sheet 3 can be maintained. In other words, the dancer unit 27 is capable of releasing the sheet-like material 3 that can be discharged from the buffer unit 26 and the conveyance amount of the sheet-like material conveyed to the unwinding unit 6 (referred to as a winding conveyance amount). When a difference occurs, the tension of the sheet 3 is maintained by displacing the winding roller 36 within a predetermined range.

The movement of the winding roller 36, that is, the position (displacement) of the winding roller 36 is detected by a displacement sensor (potentiometer) 37. In other words, when the winding roller 36 is displaced due to the occurrence of a difference between the releasable amount and the winding conveyance amount, the displacement sensor 37 detects this displacement.
Based on the detection result of the displacement sensor 37, the controller 21 (main control unit 9) controls the unwinding shaft 7 and the first drive roller so that the winding roller 36 maintains a predetermined position (substantially constant position). The drive of at least one of D1, the second drive roller D2, and the buffer unit 26 is controlled. Specifically, the control device 21 controls the first drive motor M1, the third drive motor M3, and the fifth drive motor M5 such that the winding roller 36 maintains a predetermined position based on the detection result of the displacement sensor 37. Control the speed of movement of the dancer rollers 30a to 30d in the direction approaching the rotation rollers 29a to 29e, the speed of rotation of the unwinding shaft 7 in the winding direction, and the first drive roller D1 and the second drive. The speed of at least one of the rotational speed of the roller D2 is controlled.

  In this embodiment, although the change in tension of the predetermined range of the sheet 3 between the buffer unit 26 and the slitter 4 is absorbed by the dancer unit 27, the tension or slack of the sheet 3 which can not be absorbed by the dancer unit 27. (In the case where the winding roller 36 is displaced beyond the range that can be absorbed by the dancer unit 27), the first winding roller 36 is returned to a predetermined position (for example, an initial position before the displacement). At least one of the drive motor M1 and the third drive motor M3 and the fifth drive motor M5 is controlled.

  In the inspection machine 1 configured as described above, for example, the sheet 3 is unwound from the unwinding portion 6 by rotating the unwinding shaft 7 in the normal direction, and the unwound sheet 3 The sheet is driven in the sheet conveyance direction A by being driven by the first drive roller D1 to the fourth drive roller D4. At this time, the plurality of dancer rollers 30 are located at a position separated upward from the rotation roller 29, and the sheet-like material 3 is accumulated in the buffer unit 26.

  When the sheet 3 unwound from the unwinding unit 6 passes the inspection unit 16, the label 2 on the sheet 3 is inspected in the inspection unit 16 to determine whether it is defective. If no defective label 2 is found, the sheet 3 passes through the processing unit 17, the buffer unit 26, the dancer unit 27 and the like to reach the slitter unit 4 and is cut by the slitter unit 4. After cutting, the sheet 3 is taken up by the winding unit 11. If there is a label 2 determined to be defective in the inspection unit 16, when the defective label 2 reaches the processing unit 17, the control device 21 drives the inspection machine 1 (first drive motor M 1 to M 1 The drive of the fourth drive motor M4 is stopped. The defective label 2 is replaced with another label 2 by the operator at the processing unit 17.

As shown in FIG. 1, a switch (button) 43 for retesting is connected to the main control unit 9, and after replacing the label 2, when the switch 43 is operated (pressed), the control device 21 forms a sheet Resume transport of object 3.
When the switch 43 for retesting is operated, the control device 21 first stops driving the third drive motor M3 and the fourth drive motor M4, and then the first drive motor M1 (the unwinding shaft 7) and the second drive The fifth drive motor M5 is driven while rotating the motor M2 in the reverse direction. When the fifth drive motor M5 is driven, the plurality of dancer rollers 30 move downward. That is, the plurality of dancer rollers 30 move in the direction of loosening the sheet-like material 3 (in fact, the sheet-like material 3 is not wound because it is wound by the unwinding unit 6), and the buffer unit 26 stores The released sheet 3 can be released (released). Thus, the sheet 3 can be wound by the unwinding unit 6 in a state in which the conveyance of the sheet 3 at the downstream side of the buffer unit 26 is stopped. Then, the sheet 3 can be conveyed upstream from the buffer unit 26 by winding the sheet 3 at the unwinding unit 6.

  The control device 21 conveys the sheet 3 upstream and sends the replaced label 2 from the processing unit 17 to a position where the inspection unit 16 can inspect the first drive motor M1 and the second drive motor. The driving of the M2 and the fifth drive motor M5 is stopped. Thereafter, the control device 21 rotates the first drive motor M1, the second drive motor M2, and the fifth drive motor M5 in the forward rotation direction. Thus, the sheet 3 is conveyed in the sheet conveying direction A, and the sheet 3 is accumulated between the plurality of rotating rollers 29a to 29e and the plurality of dancer rollers 30a to 30d. When the plurality of dancer rollers 30 return to the position where the sheet-like material 3 is accumulated between the plurality of rotation rollers 29a to 29e and the plurality of dancer rollers 30a to 30d, the control device 21 drives the fifth drive motor M5. Stop.

Further, the control device 21 drives the third drive motor M3 and the fourth drive motor M4 simultaneously with driving of the fifth drive motor M5 to drive the slitter unit 4 and the winding shaft 12.
On the other hand, the replaced label 2 is inspected by the inspection unit 16, and if it is defective, the above operation is repeated.

As a method of sending the label 2 replaced by the processing unit 17 to the inspection unit 16, for example, the following method can be considered.
A buffer unit is provided on the upstream side of the inspection unit and on the downstream side of the processing unit, and the sheet-like material accumulated in the buffer unit on the downstream side can be released from the buffer unit. It is conceivable that the sheet-like material is conveyed from the downstream buffer unit to the upstream buffer unit by accumulating in the upstream buffer unit. However, according to this method, when the sheet-like material is conveyed and passes through the upstream buffer unit or is accumulated in the upstream buffer unit, the sheet-like material is transferred to the rollers of the upstream buffer unit. It is rolled, bent in a curved shape, or squeezed. This increases the possibility of the label shifting. That is, when the sheet-like material is conveyed, the sheet-like material can be stably conveyed when the portion where the sheet-like material bends is small and the distance for conveying the sheet-like material is short.

In the inspection machine 1 of the present embodiment, when sending the replaced label 2 to the inspection unit 16, the sheet-like material 3 accumulated in the buffer unit 26 can be released from the buffer unit 26 and the sheet-like material 3 is unwound. Since the sheet is wound up, there is no need for a separate device for reversely conveying the sheet 3 between the unwinding portion 6 and the inspection portion 16, and the displacement of the label 2 can be suppressed. Also,
The structure can be simplified and made compact.

  When transporting the sheet-like material 3 to the upstream side, the control device 21 determines the sheet-like material 3 in the buffer unit 26 based on the detection result of the dancer unit 27 (the position detection result of the winding roller 36 by the displacement sensor 37). Of the buffer portion 26, the unwinding shaft 7, the first drive roller D1, and the second drive roller D2 so that the dischargeable amount of the sheet 3 substantially matches the transport amount of the sheet 3 conveyed to the upstream side. Control at least one drive. Specifically, at least one of the rotational speeds of the first drive motor M1 and the second drive motor M2 and the rotational speed of the fifth drive motor M5 is controlled. For example, the rotational speeds of the first drive motor M1 and the second drive motor M2 are constant, and control is performed to change the rotational speed of the fifth drive motor M5.

Thereby, the tension of the sheet-like material 3 can be made appropriate when conveying the sheet-like material 3 to the upstream side, and the breakage of the sheet-like material 3 and the slack of the sheet-like material 3 due to excessive tension can be prevented. can do.
For example, when the sheet 3 is conveyed upstream so as to send the replaced label 2 to the inspection unit 16, the number of rotations of the first drive motor M1 and the second drive motor M2 and the rotation of the fifth drive motor M5 As a method of controlling at least one of the number of rotations, a tension detector for detecting the tension of the sheet 3 is provided between the buffer unit 26 and the slitter unit 4 and based on the detection result of this tension detector There is a method of controlling the number of rotations of the drive motor to be controlled so as to keep the tension of the sheet 3 between the buffer unit 26 and the slitter unit 4 constant. In this method, rotation control of the drive motor must be performed severely, which makes control difficult.

  In the present embodiment, the winding roller 36 is urged in the tension direction of the sheet 3 by the air cylinder 38, and a slight change in tension of the sheet 3 is absorbed by the displacement of the winding roller 36 and the sheet The first drive motor M1 and the first drive motor M1 are configured to maintain the tension 3 at a predetermined tension and return the winding roller 36 to a predetermined position when the winding roller 36 is displaced beyond the range that the dancer unit 27 can absorb. Since at least one of the three drive motor M3 and the fifth drive motor M5 (for example, the fifth drive motor M5) is controlled, there is an advantage that it is easy to control the rotational speed of the drive motor to be controlled. .

Note that, based on the detection result of the tension detector provided between the buffer unit 26 and the slitter unit 4, the number of rotations of the first drive motor M1 and the second drive motor M2 and the number of rotations of the fifth drive motor M5 The rotational speed of at least one of the above may be controlled.
Further, in the present embodiment, the dancer portion 27 is disposed above the buffer portion 26. The dancer portion 27 has an air cylinder 38 for urging the winding roller 36 in the tension direction of the sheet 3 The air cylinder 38 is disposed sideways. Thereby, the dancer unit 27 can be configured to be compact in the vertical direction, and between the buffer unit 26 and the device disposed above the buffer unit 26 (in the present embodiment, the second meandering correction device 24) , And the dancer unit 27 can be made compact. Thereby, inspection machine 1 can be constituted compactly.

  As mentioned above, although one Embodiment of this invention was described, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is indicated not by the above description but by claims, and is intended to include all modifications within the meaning and scope equivalent to claims.

DESCRIPTION OF SYMBOLS 2 label 3 sheet-like material 4 slitter unit 6 unwinding unit 7 unwinding shaft 16 inspection unit 17 processing unit 21 control unit 26 buffer unit 27 dancer unit 29 a rotating roller (first rotating roller)
29b Rotating roller (second rotating roller)
29c Rotating roller (3rd rotating roller)
29d Rotating roller (4th rotating roller)
29e Rotating roller (5th rotating roller)
30a Dancerola (1st Dancer Roller)
30b Dancerola (2nd dancer roller)
30c Dancerola (3rd Dancer Roller)
30d Dancerola (4th Dancer Roller)
36 winding roller 37 displacement sensor 38 air cylinder A sheet conveying direction b1 unwinding direction b2 winding direction L longitudinal direction

Claims (6)

An unwinding portion having an unwinding shaft rotatable in an unwinding direction for unwinding a sheet-like material provided with labels arranged in the longitudinal direction and a winding direction for winding up the sheet-like material;
An inspection unit which inspects whether or not the label of the sheet-like material unwound from the unwinding unit and conveyed in the sheet conveying direction is defective;
A processing unit provided on the downstream side of the sheet conveyance direction of the inspection unit for replacing a label determined to be defective by the inspection unit;
A slitter portion provided on the downstream side of the sheet conveyance direction of the processing unit to cut the sheet-like material along the sheet conveyance direction;
A buffer unit which is provided between the processing unit and the slitter unit and stores the sheet-like material, and in a state where the conveyance of the sheet-like material on the downstream side in the sheet conveyance direction from the buffer unit is stopped. A buffer unit for releasably accumulating the sheet material having a length capable of conveying the sheet material upstream in the sheet conveying direction and sending the replaced label to the inspection unit;
Equipped with
The sheet-like material accumulated in the buffer unit can be released from the buffer unit and the winding shaft is rotated in the winding direction to wind the sheet-like material upstream of the sheet in the sheet conveyance direction. Sheet material inspection machine that can be transported to the side. A controller for controlling the unwinding shaft and the buffer unit;
The buffer unit has a plurality of rotating rollers and a plurality of dancer rollers movable in a direction approaching or separating from the rotating rollers, and a sheet-like material is formed by the plurality of rotating rollers and the plurality of dancer rollers. By alternately winding the sheet, and by moving the dancer roller in a direction close to the rotating roller, the sheet can be discharged;
The control device is configured such that, when sending the refolded label to the inspection unit, the dischargeable amount of the sheet-like material that can be discharged from the buffer unit and the conveyance amount of the sheet-like material to the unwinding unit are substantially the same. The sheet-like material according to claim 1, wherein the speed of at least one of the moving speed of the dancer roller in the direction approaching the rotating roller and the rotational speed of the winding direction of the unwinding shaft is controlled Inspection machine.   3. The sheet material inspection machine according to claim 1, further comprising a dancer portion for maintaining the tension of the sheet between the buffer portion and the slitter portion. The dancer unit is
A sheet-like material is wound, and it has a winding roller which can be displaced in the tension direction and the slack direction of the sheet-like material, and a displacement sensor which detects the position of the winding roller.
The controller is
Based on the detection result of the displacement sensor, the moving speed of the dancer roller in the direction approaching the rotating roller and the rotational speed in the winding direction of the unwinding shaft so that the winding roller maintains a predetermined position 4. The sheet material inspection machine according to claim 3, wherein the speed of at least one of the two is controlled. The dancer unit is
It has a winding roller on which the sheet is wound and which can be displaced in the tension direction and the slack direction of the sheet, and a biasing device which biases the winding roller in the tension direction of the sheet.
And when the dischargeable amount of the sheet-like material which can be discharged from the buffer unit and the conveyance amount of the sheet-like material to the unwinding unit are different, the winding roller is displaced within a predetermined range. The sheet material inspection machine according to claim 3 or 4, wherein the tension of the sheet material is maintained by   The sheet material inspection machine according to claim 5, wherein the biasing device is constituted by an air cylinder disposed laterally above the buffer unit.

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