JP2019001571A - Roller and sheet conveying device - Google Patents

Abstract

To provide a roller capable of preventing occurrence of errors in reading optical images from an article to be conveyed.SOLUTION: A roller 11 brought into contact with a sheet-like article to be conveyed to deliver it in a surface direction includes plural projected lines 12 extended in a direction inclined to a rotational center axis C on an outer peripheral surface, and the projected lines 12 are characterized in having partially a thin wall part in a cross section view crossing with the rotational center axis C.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sheet conveying roller and a conveying apparatus including the conveying roller.

  In a copying machine, a printer, an image scanner, a facsimile, or the like that uses a so-called single-sheet paper as a printing object, a conveying roller that conveys a sheet-like object to be conveyed, such as a paper sheet, is used. Yes. The transport device described in Patent Document 1 uses a roller made of rubber or the like that feeds the surface of a paper sheet in the direction of the paper surface by applying a frictional force.

12 to 15 show a conventional example of a conveyance roller used for the above-mentioned application. The roller 1 in the illustrated example has a smooth outer periphery (surface) covered with rubber or the like. The roller 1 contacts the surface of the paper sheet 2 as a transported object and rotates in the direction of arrow a, thereby transporting the paper sheet 2 in the direction of arrow b.
While the roller 1 is used for a long period of time, the surface formed of rubber or the like is worn to smooth the surface, or as shown in FIGS. Paper dust generated from 2 or graphite (pencil core) powder that has detached from the brush marks once attached to the surface of the paper sheet 2 with the entry of the mark, or fine debris due to its own wear, etc. When the fine powder 3 is interposed between the paper sheets 2, it may not be possible to obtain a frictional force sufficient to obtain a force necessary for conveyance.

Further, Patent Document 2 discloses a roller having irregularities on the outer peripheral surface in order to apply a sufficient frictional force to the conveyed object.
FIGS. 16 to 19 show other conventional examples of the roller. The surface of the illustrated roller 5 is made of an elastic material such as rubber, and a plurality of grooves 6 are parallel to the rotation center and circumferentially. It is provided at intervals. In the roller 5, as shown in FIGS. 17 and 18A, the convex portions 7 on both sides of the plurality of grooves 6 are in close contact with the paper sheet 2 while being elastically deformed. A grip force stronger than that of the smooth surface roller can be obtained, and the paper sheet 2 can be more reliably conveyed in the arrow b direction by rotation in the arrow a direction.

JP 2008-162785 A Utility Model Registration No. 3155281

  However, in the above conventional example, as shown in FIG. 15, the graphite powder that is detached from the surface of the paper sheet 2 and adheres to the roller 1 is removed from the paper sheet 2 (the illustrated paper sheet is written on a mark sheet). The belt-shaped retransfer marks 4 may be generated. Further, such a retransfer mark 4 may hinder accurate reading of the mark written on the mark sheet paper.

  In the other conventional example, as shown in FIG. 18 (b), the corners of the convex portions 7 of the roller 5 are worn roundly over a long period of use, and a sufficient frictional force is applied to the paper sheet 2. May not be possible. Further, if the frictional force is insufficient, the paper sheet 2 may be poorly transported or the transport speed may become unstable, which may hinder accurate reading of the mark.

  Further, as shown in FIG. 19, the graphite powder that is detached from the surface of the paper sheet 2 and adheres to the roller 5 is transferred to the paper sheet 2 (the illustrated paper sheet is a mark sheet entry sheet) and is continuously striped. In some cases, a retransfer mark 8 having a shape is generated. Further, such a retransfer mark 8 may hinder accurate reading of the mark entered on the mark sheet entry sheet.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent occurrence of errors in optical image reading from a conveyed object.

  In order to solve the above-described problem, the roller according to the first aspect of the present application is a roller that sends out in a surface direction in contact with a sheet-like object to be conveyed, and is inclined in a direction inclined with respect to the rotation center axis on the outer peripheral surface. A plurality of protruding ridges are provided, and each of the ridges has a thin portion in a cross-sectional view intersecting with the rotation center axis.

  A conveying device according to a second aspect of the present application includes a roller that is in contact with a sheet-like object to be conveyed and is fed in a surface direction, and a driving device that rotates the roller. A plurality of ridges heading in a direction inclined with respect to the ridge, the ridges having a thin portion in a cross-sectional view intersecting the rotation center axis.

  According to the present invention, it is possible to prevent an error in reading an image from a sheet such as a paper sheet that is a conveyed object.

1 is a perspective view showing a first embodiment of the present invention. It is a perspective view which shows the whole structure of the conveying apparatus provided with the roller concerning 2nd Embodiment of this invention. It is a front view of the roller concerning a 2nd embodiment of the present invention. It is a top view which shows the retransfer trace of the to-be-conveyed object conveyed by the roller concerning 2nd Embodiment of this invention. It is a perspective view which shows the whole structure of the conveying apparatus provided with the roller concerning 3rd Embodiment of this invention. It is a front view of the roller concerning 3rd Embodiment of this invention. It is a top view which shows the retransfer trace of the to-be-conveyed object conveyed by the roller concerning 3rd Embodiment of this invention. It is explanatory drawing of the deformation state of the protruding item | line in each embodiment of this invention. It is an enlarged view of the chain line IX part of FIG. It is sectional drawing in the cross section orthogonal to the axis | shaft which shows the 1st modification of the protruding item | line of the roller concerning 1st-3rd Embodiment. It is sectional drawing in the cross section orthogonal to the axis | shaft which shows the 2nd modification of the protruding item | line of the roller concerning 1st-3rd embodiment. It is a perspective view which shows the external appearance of one conventional example of a roller. It is a side view of the roller of one prior art example. It is the enlarged view which looked at the chain line XIV part of FIG. 13 from the slightly diagonal direction. It is a top view which shows the retransfer trace which arose on the paper sheets with the roller of one prior art example. It is a perspective view which shows the external appearance of the other conventional example of a roller. It is a side view of the roller of another prior art example. It is an enlarged view of the chain line XVIII part of FIG. It is a top view which shows the retransfer trace which arose on the paper sheets with the roller of the other conventional example.

A first embodiment according to the minimum configuration of the present invention will be described with reference to FIG.
Reference numeral 11 denotes a roller, which rotates in the direction of arrow a around the axis C, thereby conveying the conveying force in the direction of arrow b to a conveyed object such as a paper sheet.

  At least the surface of the roller 11 is made of an elastic material such as rubber, and a convex strip 12 that is inclined with respect to a direction parallel to the axis C is formed on the surface. In other words, the groove 13 is formed between the adjacent ridges 12. The ridges 12 and the grooves 13 are alternately provided in the circumferential direction and have a wave shape in a cross-sectional view orthogonal to the axis C. Moreover, the said protruding item | line 12 has comprised the shape which width | variety reduces gradually to a front end direction in the cross sectional view orthogonal to the axis line C.

  In the roller 11 having the above-described configuration, the tip of the ridge 12 is elastically deformed, so that it can be brought into close contact with the object to be transported and a transport force can be applied. In addition, since the ridges 12 are inclined, the re-transfer marks are inclined with respect to the width direction of the object to be conveyed due to adhesion of graphite powder or the like with long-term use. It is difficult to cause image reading errors from printed characters, marks, and the like along the direction (parallel to the width direction to side by side in the direction perpendicular to the conveyance direction).

A second embodiment will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as other embodiment in a figure, and description is simplified.
On the surface of the roller 21 of the second embodiment, a plurality of ridges 22 that are alternately inclined in different directions are formed in a front view, and the ridges 22 are similarly inclined alternately in different directions. Groove 23 is formed.

A driving device 24 such as a motor provided with the roller 21 aligned with the axis C is connected to the roller 21 by the axis (drive shaft) C, so that a rotational force in the direction of arrow a is applied to the roller 21. The object to be conveyed 2 is conveyed in the direction of arrow b by this rotational force.
A member (not shown) such as a receiving roller, a belt conveyor, and a flat plate with a smooth surface is provided at a position facing the roller 21 with the object to be conveyed 2 interposed therebetween. A conveying force is applied to the object 2.

  As shown in FIG. 3, the ridges 22 are bent at the same width w1 and inclined in different directions.

  In the roller 21 having the above-described configuration, the tip of the ridge 22 is elastically deformed, so that the carrying force can be applied in close contact with the surface of the article to be conveyed 2 regardless of deformation due to wear of the tip. Further, since the ridges 22 are inclined, when a retransfer trace 4 is generated due to adhesion of graphite powder or the like with long-term use, the retransfer trace 4 is inclined with respect to the conveyed object 2. Wavy. For this reason, it is easy to distinguish from the straight line (the straight line in the direction orthogonal to the transport direction) formed by the characters 2a and the marks 2b printed along the width direction of the transported object 2 (parallel to the width direction), Therefore, it is difficult to cause an optical image reading error.

Further, even if the protruding ridges 22 that are continuously inclined while being inclined are formed with a thin tip, the shape thereof is more easily maintained than when formed in a straight line inclined in one direction. That is, since the tip (ridge line) of the ridge 22 is formed in a wavy or zigzag shape, the tip is prevented from falling down and an appropriate repulsive force is obtained, and an effective grip force on the paper sheet 2. Can be maintained.
On the other hand, the protruding ridges 22 that are continuously inclined while being inclined alternately are formed in a straight line inclined in one direction from one end to the other end of the roller 21 even though the tip is thinly formed. The shape is easily maintained.
In addition, as the retransfer trace 4, a certain stable wavy or zigzag shape is transferred as compared with the case where the ridges 22 are elastically deformed freely. By storing the trace as a known image in advance, it can be easily distinguished from the original mark or the like.

A third embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same structure as other embodiment in a figure, and description is simplified.
On the surface of the roller 31 of the second embodiment, a plurality of ridges 32 that are alternately inclined in different directions are formed in a front view, and the ridges 32 are similarly inclined alternately in different directions. A groove 33 is formed. As in the second embodiment, the roller 31 is driven by a motor or the like and rotated in the direction of arrow a, thereby moving the roller 31 to the conveyed object 2 sandwiched between the receiving member (not shown) in the direction of arrow b. Apply conveying force.

  As shown in FIG. 6, the ridges 32 are bent at different widths w2 and w3 and are inclined in different directions.

In the roller 31 having the above-described configuration, the tip of the ridge 32 is elastically deformed, so that it can be brought into close contact with the article to be conveyed 2 and a conveying force can be applied. Further, since the ridges 32 are inclined, the retransfer trace 4 (see FIG. 7) due to adhesion of graphite powder or the like with long-term use is a wave shape inclined with respect to the object to be transported 2, Since the wave widths are different and not constant, such as w2 and w3, the retransfer marks generated on the paper sheets 2 are greatly different from simple straight lines.
Therefore, the zigzag re-transfer marks generated on the mark sheet and the like, and the straight line formed by the characters 2a and the marks 2b printed along the width direction of the object 2 (in a straight line along the direction orthogonal to the conveyance direction) The difference is clearer and easier to distinguish, and therefore it is difficult for optical image reading errors to occur. Further, the protruding ridges 32 that are continuously inclined while being inclined alternately are more easily maintained than the case where they are simply formed in a straight line inclined only in one direction, although the tip is formed thin.

With reference to FIGS. 8 and 9, operations common to the rollers of the first to third embodiments will be described.
As shown in FIG. 8, the roller 11 rotates in the direction of the arrow a with the paper sheet 2 interposed between the receiving roller 14 provided as necessary, and thereby exerts a conveying force in the direction of the arrow b. Can do.

  Specifically, as shown in FIG. 9, the ridges 12 of the roller 11 are formed on the paper sheet 2 while repeatedly deforming between an elastically deformed state as indicated by a solid line and a restored state indicated by a broken line. Contact and transport it. This repeated deformation and restoration occurs at each part of the ridge 12 whose tip is formed so as to be elastically deformable, so that the surface of the roller 11 is randomly worn, and a part of the ridge 12 is worn. The possibility of occurrence of a conveyance failure due to, for example, a conveyance failure such as an oblique feed due to an imbalance of grip force between a worn region and a non-weared region is reduced.

FIG. 10 shows a first modification of the roller of the first to third embodiments.
The ridge 42 of the roller 41 has a cross-sectional shape in which the thickness gradually decreases in the distal direction.
Since the convex strip 42 has a cross-sectional shape that gradually decreases in thickness toward the tip, the tip can be easily deformed by contact with the article 2 to be conveyed. That is, when the tip wears out and disappears, the necessary conveying force can be obtained while bringing the proximal end portion into contact with the object to be conveyed.

FIG. 11 shows a second modification of the roller of the first to third embodiments.
The convex strip 52 of the roller 51 has a constricted portion 52a at the base end portion, and is easily deformed from the base end portion provided with the constricted portion 52a while bringing the tip into contact with the object to be conveyed with an appropriate contact force. The necessary conveying force can be obtained.
By adopting such a cross-sectional shape, the protrusion 52 can be appropriately elastically deformed and brought into contact with the conveyed object 2 while ensuring a contact area with the conveyed object 2.

  In the configuration in which the ridge provided on the roller is inclined, the position (rotation angle to phase) of the ridge in the roller rotation direction is shifted according to the position from one end side to the other end side of the roller in the axial direction. It means that. That is, as long as the position of the ridge is shifted in the rotation direction, the inclination may be linear or curved. In addition, the configuration in which the ridges are inclined in different directions includes various shapes that are changed regardless of whether the ridge inclination direction is continuous or discontinuous, regardless of zigzag or wavy. It is a waste.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, this invention is not limited to the said embodiment, A various deformation | transformation is possible within the range of the invention described in the claim. Needless to say, they are also included in the scope of the present invention.

  The present invention relates to a conveying device that supplies a sheet-like reading target to an image reading device and the like, and a roller used in the conveying device.

2 ... Conveyed objects (sheets, paper sheets)
DESCRIPTION OF SYMBOLS 11 ... Roller 12 ... Convex strip 13 ... Groove part 14 ... Receiving roller 21 ... Roller 22 ... Convex strip 23 ... Groove part 24 ... Drive device 31 ... Roller 32 ... Convex strip 33 ... Groove part 41 ... Roller 42 ... Projection 51 ... Roller 52 ... Projection 52a ... Constriction C ... Axis (drive shaft)

Claims (10)

A roller that contacts a sheet-like object to be conveyed and feeds it in a surface direction,
On the outer peripheral surface, it has a plurality of ridges that go in a direction inclined with respect to the rotation center axis,
The ridge is a roller having a thin portion in a part in a cross-sectional view intersecting the rotation center axis. The roller according to claim 1, wherein a groove is provided between the plurality of protrusions.   3. The roller according to claim 1, wherein each of the ridges is directed in directions inclined in a plurality of different directions with respect to the rotation center axis.   The roller according to claim 3, wherein the protrusions are alternately inclined in different directions.   The roller according to claim 4, wherein each of the ridges is alternately bent and bent in a front view.   The roller according to claim 4, wherein each of the ridges is bent in a wave shape when viewed from the front.   The roller according to claim 4, wherein each of the ridges is bent in a polygonal line shape when viewed from the front.   The roller according to any one of claims 5 to 7, wherein the bent portions of the ridges are provided at equal intervals in a direction along the rotation center axis.   The roller according to any one of claims 5 to 7, wherein at least some of the bent portions of the convex ridges are different from each other in a direction along the rotation center axis.   A sheet conveying apparatus comprising: the roller according to claim 1; and a driving device that rotates the roller.

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