JP2017210304A - Sheet processing device - Google Patents

Abstract

An object of the present invention is to provide a sheet processing apparatus capable of accurately conveying a sheet to a downstream processing machine. A plurality of conveying roller pairs 2 for conveying a sheet while nipping the sheet are provided. The conveying roller pair 2 has a driving roller 21 and a driven roller 22. is a multi-layer roller, and the multi-layer roller consists of a roller shaft 201 and a nipping portion layer 202 covering the outer peripheral surface of the roller shaft 201, and the nipping portion layer 202 has a multi-layer structure. and an inner elastic layer 221 having a first hardness and an outer elastic layer 222 having a second hardness, and the second hardness is set higher than the first hardness. and [Selection drawing] Fig. 3

Description

  The present invention relates to a sheet processing apparatus that processes a sheet while conveying the sheet.

  Many sheet processing apparatuses include a vertical cutting machine that cuts a sheet along the conveyance direction, and a horizontal processing machine that processes the sheet along a direction orthogonal to the conveyance direction (hereinafter referred to as the width direction). doing. Examples of processing in a horizontal processing machine include cutting, crease formation, and perforation formation. In the sheet processing apparatus, a plurality of conveyance roller pairs convey the sheet while sandwiching the sheet. In such a sheet processing apparatus, it is desired that the sheet is conveyed with high accuracy. For this reason, use of various pairs of conveying rollers has been proposed. For example, sponge rollers and rubber rollers have been proposed. In the sponge roller, the sandwiching portion layer covering the outer peripheral surface of the roller shaft body is made of sponge, and in the rubber roller, the sandwiching portion layer is made of a rubber material.

JP 2013-220897 A

  However, the use of a sponge roller has the following problems. That is, if the conveyance stop state continues for a long time, the pressure contact position of the sponge roller with the other conveyance roller is deformed and does not return, and the subsequent conveyance accuracy is lowered by the deformed portion. Therefore, in particular, when a sponge roller is used as one roller of the pair of conveyance rollers upstream of the horizontal processing machine, the conveyance accuracy of the sheet fed to the horizontal processing machine is lowered, and as a result, horizontal processing is desired. Not executed in position.

  Further, when a rubber roller is used, there are the following problems. That is, the clamping force in the width direction of the pair of conveyance rollers using the rubber roller is not uniform. Therefore, when a rubber roller is used as one roller of the pair of conveyance rollers upstream of the processing machine, the sheet conveyed toward the processing machine is conveyed while being skewed, and the conveyance accuracy is lowered. As a result, subsequent processing is hindered. In particular, when a rubber roller is used as one roller of a pair of conveying rollers downstream of the vertical cutting machine, a plurality of sheet pieces produced by the vertical cutting machine are conveyed while being skewed, It is transported at different transport speeds, resulting in a decrease in transport accuracy. As a result, subsequent processing is hindered.

  The present invention is a sheet processing apparatus that can prevent a decrease in conveyance accuracy, and therefore can convey a sheet before or after processing to a downstream processing machine with good conveyance accuracy, and as a result, improve the sheet processing accuracy. The purpose is to provide.

The present invention relates to a sheet processing apparatus that processes a sheet while conveying the sheet, and a plurality of conveying roller pairs that convey the sheet while nipping the sheet, and a vertical processing machine that processes the sheet along the conveying direction, and / or A horizontal processing machine that processes the sheet along a direction orthogonal to the conveyance direction, and the conveyance roller pair includes at least one of a pair of rollers as a driving roller, and at least one of the conveyance roller pairs. , One roller and / or the other roller is a multi-layer roller,
The multilayer roller includes a roller shaft body and a sandwiching portion layer that covers an outer peripheral surface of the roller shaft body, and the sandwiching portion layer has a multilayer structure and has a first hardness. It has an inner elastic layer and an outer elastic layer having a second hardness, and the second hardness is set to be larger than the first hardness.

  According to the present invention, a pair of transport rollers having a multilayer roller can transport a sheet before or after processing to a downstream processing machine with high transport accuracy.

1 is a schematic longitudinal sectional view showing an entire sheet processing apparatus according to an embodiment of the present invention. It is the schematic which looked at the conveyance roller pair from the downstream of the conveyance direction. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a block diagram of a control part.

  FIG. 1 is a schematic longitudinal sectional view showing the entire sheet processing apparatus according to an embodiment of the present invention. The sheet processing apparatus 1 processes a sheet 100 while conveying it. The sheet 100 may be a paper sheet or a resin sheet. The sheet processing apparatus 1 includes a sheet feeding unit 11 including a sheet feeding tray and a sheet discharging unit 12 including a sheet discharge tray at both ends of the apparatus main body 10. From the paper feeding unit 11 to the paper discharge unit 12, a conveyance path 20 is configured by conveyance means including a large number of conveyance roller pairs 2. The conveyance roller pair 2 is coupled to a conveyance driving unit (not shown). On the conveyance path 20, from the paper feeding unit 11 side, conveyance correction means (not shown), information reading means 32, rejection means 33, first vertical cutting machine 4A, second vertical cutting machine 4B, third A vertical cutting machine 4C, a chip removal means 34, a first horizontal processing machine 5A, a second horizontal processing machine 5B, and an optional processing machine 6 are provided. These are all supported by the apparatus main body 10. Further, a processing drive means (not shown) is connected to these means.

  The first to third vertical cutting machines 4A to 4C are configured to cut the sheet 100 along the conveyance direction X. That is, the first to third vertical cutting machines 4A to 4C are one form of the vertical processing machine. The first horizontal processing machine 5A is configured to cut the sheet 100 along a direction orthogonal to the transport direction X (that is, the width direction). The second horizontal processing machine 5B is configured to perform crease formation on the sheet 100 along the width direction.

  In addition, the sheet processing apparatus 1 includes a control unit 7 that controls the operation of the entire apparatus in the apparatus main body 10. The control unit 7 is connected to an operation panel (not shown) and has a CPU. Furthermore, the sheet processing apparatus 1 has a trash box 81 for storing chips generated by cutting the sheet 100 at the bottom of the apparatus main body 10.

  The conveyance roller pair 2 includes a driving roller 21 and a driven roller 22. The driving roller 21 and the driven roller 22 are provided in pressure contact with each other so that the sheet 100 can be nipped and conveyed from above and below. The transport driving unit is connected to the driving roller 21.

  Further, as shown in FIG. 2, the conveying roller pair 2 includes an auxiliary pressing roller 23 above the driven roller 22. The auxiliary pressing roller 23 is provided so as to equalize the pressing force in the width direction of the driven roller 22 against the driving roller 21 by pressing the driven roller 22 toward the driving roller 21. Preferably, the auxiliary pressing roller 23 is provided at the center in the width direction of the driven roller 22 as shown in FIG.

  In this embodiment, a multilayer roller as shown in FIG. 3 is used as the driven roller 22 of all the conveyance roller pairs 2. The multi-layer roller is composed of a roller shaft body 201 and a sandwiching portion layer 202 that covers the outer peripheral surface of the roller shaft body 201 as in the case of a general conveying roller. However, in the multi-layer roller, the sandwiching portion layer 202 has a multi-layer structure, and includes an inner elastic body layer 221 and an outer elastic body layer 222. The inner elastic body layer 221 has a first hardness, and the outer elastic body layer 222 has a second hardness, which is set to “first hardness <second hardness”. For example, the inner elastic body layer 221 can be made of EPDM rubber having a rubber hardness of 10 degrees, and the outer elastic body layer 222 can be made of EPDM rubber having a rubber hardness of 50 degrees. The rubber hardness is a hardness measured by a method based on JIS K 6253 standard.

  Moreover, the control part 7 has the roller control part 71 which controls the action | operation of the conveyance roller pair 2, as FIG. 4 shows. The roller control unit 71 rotates the driving roller 21 and the driven roller 22 by an angle α every time T has elapsed during standby when the rotation of the conveying roller pair 2 is stopped, that is, when the sheet processing apparatus 1 is stopped. In addition, the conveyance driving means is controlled. The T time is, for example, 1 hour. The angle α is preferably an angle that is not a divisor of 360 degrees, for example, 43.2 degrees is adopted.

  According to the multilayer roller having the above-described configuration, the inner elastic layer 221 can maintain the uniformity of the pressing force in the width direction, and therefore can maintain the uniformity of the clamping force between the driving roller 21 and the driven roller 22, and The outer elastic layer 222 can prevent deformation due to the driving roller 21 being in pressure contact. Therefore, according to the transport roller pair 2 having the above-described configuration, it is possible to prevent deterioration in transport accuracy.

  Table 1 shows the performance of the multi-layer roller having the above configuration in comparison with the conventional sponge roller and rubber roller. The sandwiching portion layer 202 of the multilayer roller has an inner elastic body layer 221 made of EPDM rubber having a rubber hardness of 10 degrees and an outer elastic body layer 222 made of EPDM rubber having a rubber hardness of 50 degrees. Yes. The sandwiching portion layer of the rubber roller is made of NBR having a rubber hardness of 60 degrees. The sandwiching layer of the sponge roller is made of foamed hydrin rubber having a hardness equivalent to 30 degrees of rubber hardness, and is covered with a heat-shrinkable polyester having a thickness of about 0.05 mm.

  In the performance item of Table 1, “pressure balance” means the uniformity of the pressing force in the width direction, and is indicated by the skew amount when the sheet is conveyed. “Feed accuracy” means the accuracy of the transport distance in the transport direction, and is indicated by the maximum error in the transport direction dimension of the sheet after cutting with respect to the reference transport direction dimension of the cut along the width direction of the sheet. ing. “Deformation resistance” means the difficulty of deformation of the driven roller due to the pressure contact of the driving roller. The amount of change in the outer diameter of the other rollers over time when the sponge roller is used as a reference. Shown in percentage.

  As shown in Table 1, the sponge roller has both “deformation resistance” and “feed accuracy” that are inferior to those of the multi-layer roller. Therefore, the “conveyance accuracy” is inferior to that of the multi-layer roller. Because “pressure balance” and “feed accuracy” are both inferior to the multi-layer roller, “conveyance accuracy” is inferior to that of the multi-layer roller. And “deformation resistance” are both excellent, and “conveyance accuracy” is excellent.

  In particular, the multi-layer roller having the above-described structure has the outer elastic body layer 222 having a rubber hardness of 40 degrees or more, so that it is difficult to cause damage due to friction with the sheet 100, and thus has excellent wear resistance. Incidentally, in a sponge roller or a rubber roller having a rubber hardness of 30 degrees or less, damage such as scraping is likely to occur at the contact portion with the sheet due to friction with the sheet.

  Therefore, according to the sheet processing apparatus 1 having the above-described configuration, when the sheet 100 fed from the sheet feeding unit 11 is transported by the pair of transport rollers 2 upstream of the first longitudinal cutting machine 4A, skewing occurs. There is no. Therefore, the sheet 100 can be conveyed to the downstream processing machine with high conveyance accuracy. Moreover, according to the sheet processing apparatus 1 having the above-described configuration, skew is generated when a plurality of sheet pieces produced by the first to third longitudinal cutting machines 4A to 4C are conveyed by the downstream conveying roller pair 2. In addition, the sheet pieces are not conveyed at different conveyance speeds. Therefore, each sheet piece can be conveyed to a downstream processing machine with high conveyance accuracy. Furthermore, according to the sheet processing apparatus 1 having the above-described configuration, when the sheet 100 is fed to each of the first horizontal processing machine 5A and the second horizontal processing machine 5B by the upstream conveyance roller pair 2, it can be fed with high conveyance accuracy. it can. Therefore, according to the sheet processing apparatus 1 configured as described above, the processing accuracy of the sheet 100 can be improved.

  Further, since the conveying roller pair 2 includes the auxiliary pressing roller 23, it is possible to exhibit a more excellent “pressure balance”. Therefore, also from this point, the conveyance roller pair 2 can convey the sheet 100 with good conveyance accuracy. Therefore, the sheet processing apparatus 1 having the above configuration can further improve the processing accuracy of the sheet 100. Moreover, in the past, the auxiliary pressure roller was in pressure contact with the driven roller, and the pressure contact portion of the driven roller was deformed. However, according to the sheet processing apparatus 1 configured as described above, the driven roller 22 is Since it is a multilayer roller, it can exhibit excellent “deformation resistance”.

  Conventionally, the driving roller 21 and the driven roller 22 may be in a state where the same portion is in pressure contact for a long time when the conveying roller pair 2 is on standby. In that case, deformation occurs particularly in the pressure contact portion of the driven roller 22. However, in the present embodiment, the driving roller 21 and the driven roller 22 are rotated by the angle α every time the waiting time of the conveying roller pair 2 elapses by the roller control unit 71, so that the driving roller 21 and the driven roller 22 are driven. The roller 22 will not be in a state where the same portion is in pressure contact for a long time. Therefore, also from this point, the conveying roller pair 2 can exhibit more excellent “deformation resistance”. Therefore, the sheet processing apparatus 1 having the above configuration can further improve the processing accuracy of the sheet 100.

  Moreover, if the angle α is not a divisor of 360 degrees, the same portion will not be in pressure contact even if the driving roller 21 and the driven roller 22 are rotated a plurality of times. Therefore, in this case, “deformation resistance” can be further improved.

[Modification]
(1) The first hardness is preferably in the range of 10 to 30 degrees of rubber hardness, and the second hardness is preferably in the range of 40 to 70 degrees of rubber hardness. However, the difference between the first hardness and the second hardness is preferably 15 degrees or more.
(2) The inner elastic body layer 221 may have a structure of two or more layers as long as it is in the first hardness range, and the outer elastic body layer 222 is two or more layers in the second hardness range. It may have the structure. For example, you may have the following structures (a)-(c).
(A) Inner elastic layer 221 having a single layer structure (rubber hardness 10 degrees) / 2 outer elastic layer 222 having a two layer structure (inner layer: rubber hardness 40 degrees, outer layer: rubber hardness 60 degrees)
(B) Two-layer inner elastic layer 221 (inner layer: rubber hardness 10 degrees, outer layer: rubber hardness 20 degrees) / one-layer outer elastic layer 222 (rubber hardness 50 degrees)
(C) Two-layer inner elastic layer 221 (inner layer: rubber hardness 10 degrees, outer layer: rubber hardness 20 degrees) / 2-layer outer elastic layer 222 (inner layer: rubber hardness 40 degrees, outer layer: rubber hardness 60 Every time)
(3) In addition to EPDM, for example, a rubber material such as NBR or urethane rubber; a sponge material such as foamed NBR, foamed CR, or foamed hydrin rubber can be used for the inner elastic layer 221. In addition to EPDM, for example, a rubber material such as NBR or urethane rubber can be used for the outer elastic body layer 222.
(4) The inner elastic body layer 221 and the outer elastic body layer 222 may be made of different elastic materials.
(5) The sheet processing apparatus 1 may include at least one processing machine of at least one form.
(6) The multi-layer roller may be used for the driving roller together with the driven roller or only for the driving roller.

(7) The multi-layer roller is used only for the pair of conveyance rollers located immediately downstream in the conveyance direction of the vertical cutting machine and / or only for the pair of conveyance rollers located immediately upstream in the conveyance direction of the horizontal processing machine. May be.
(8) The angle α by the roller control unit may be a divisor of 360 degrees.
(9) In the conveying roller pair 2, the driving roller 21 and the driven roller 22 may be disposed upside down.
(10) In the conveying roller pair 2, both rollers may be drive rollers.
(11) In the sheet processing apparatus 1, the arrangement order in the conveyance direction of the processing machine is arbitrary.

(12) As the vertical processing machine, in addition to the vertical cutting machine, a vertical perforation forming machine, a vertical crease forming machine, a vertical half cut forming machine, or the like may be used.
(13) As the horizontal processing machine, in addition to the horizontal cutting machine and the horizontal crease forming machine, a horizontal half cut forming machine or the like may be used.
(14) As other processing machines, an embossing machine, a die-cut forming machine, or the like may be used.
(15) The auxiliary pressing roller 23 may be provided so as to press the driving roller 21 toward the driven roller 22 when the driving roller 21 is a multilayer roller.
(16) The multilayer roller is coated with a coating material for the purpose of improving the wear resistance or the frictional force with the sheet, etc., so that the “conveyance accuracy” is not adversely affected. May be.

  The sheet processing apparatus of the present invention can improve the conveyance accuracy by the pair of conveyance rollers, and as a result, the sheet processing accuracy can be improved, and thus has great industrial utility value.

DESCRIPTION OF SYMBOLS 1 Sheet processing apparatus 2 Conveying roller pair 21 Drive roller 22 Driven roller 201 Roller shaft body 202 Nipping part layer 221 Inner elastic body layer 222 Outer elastic body layer 23 Auxiliary pressing roller 4A-4C Vertical cutting machine 5A, 5B Horizontal processing machine

Claims (7)

In a sheet processing apparatus that processes a sheet while conveying it,
A plurality of conveying roller pairs that convey the sheet while pinching it;
A vertical processing machine that processes the sheet along the conveying direction, and / or a horizontal processing machine that processes the sheet along the direction orthogonal to the conveying direction;
With
The conveying roller pair, at least one of the pair of rollers is a driving roller,
One roller and / or the other roller of at least one of the conveying roller pairs is a multilayer roller,
The multilayer roller includes a roller shaft body and a sandwiching portion layer that covers an outer peripheral surface of the roller shaft body, and the sandwiching portion layer has a multilayer structure and has a first hardness. An inner elastic layer and an outer elastic layer having a second hardness, wherein the second hardness is set to be greater than the first hardness;
A sheet processing apparatus. The at least one transport roller pair is the transport roller pair located immediately upstream in the transport direction of the vertical processing machine,
The sheet processing apparatus according to claim 1. The vertical processing machine is a vertical cutting machine for cutting a sheet along the conveying direction,
The at least one transport roller pair is the transport roller pair positioned immediately downstream in the transport direction of the longitudinal cutting machine;
The sheet processing apparatus according to claim 1. The at least one transport roller pair is the transport roller pair located immediately upstream in the transport direction of the horizontal processing machine;
The sheet processing apparatus according to claim 1. The at least one pair of transport rollers includes a driven roller;
At least the driven roller is the multilayer roller;
The sheet processing apparatus as described in any one of Claims 1-4. An auxiliary pressing roller that presses the multi-layer roller toward another roller;
The sheet processing apparatus according to any one of claims 1 to 5. A roller control unit for controlling the operation of the conveying roller pair;
The roller control unit rotates each roller of the transport roller pair by a predetermined angle every elapse of a predetermined time during standby of the transport roller pair.
The sheet processing apparatus according to any one of claims 1 to 6.

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