JP2005145592A - Sheet carrier roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet feed roller easy to form a projection, at low cost and capable of holding biting quantity of the projection to a sheet member constant. <P>SOLUTION: This sheet feed roller 1 is furnished with the sheet member of the predetermined width dimensions (not shown in the figure) and a plurality of projections 3a free to carry the sheet member by biting into this sheet member, the plurality of projections 3a are formed at predetermined intervals in the circumferential direction of an outer peripheral part of a projected board 3 of a plate shape the predetermined thickness and an outline of which is circular and the projected board 3 is constituted so that the plurality of projected boards 3 are laminated and integrated as a rod type rotation axis 2 is press-fitted to fit in a supporting hole 3c formed in the center of rotation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a paper feed mechanism that can be used for a printer or the like and that can suitably feed a recording paper sandwiched between a paper feed roller and a pressure roller, and a method for processing the paper feed roller used therefor.

As shown in FIG. 11, the conventional sheet feeding roller has a cylindrical roller portion 21a made of metal, and a rotating shaft portion 21b extends from the rotation center at both ends in the longitudinal direction. The rotation shaft portion 21b is formed and supported by a bearing portion on the printer (not shown) side, for example, so as to be rotatable.
In addition, a plurality of protrusions 21c are formed on the roller portion 21a so as to protrude in the circumferential direction at a height of a predetermined dimension at positions close to both left and right ends in the drawing.

When such a sheet feeding roller 21 is supported by a bearing on the printer side, a pressure contact roller (not shown) is brought into pressure contact with the outer peripheral portion of the roller portion 21a. When a sheet member (not shown) such as a recording sheet is pressed and sandwiched between the roller portion 21a and the pressure roller, the plurality of protrusions 21c bite into the sheet member.
When the sheet feeding roller 21 is rotationally driven in such a state where a plurality of protrusions are caught in the sheet member, the sheet member is conveyed to a printing unit inside the printer, and a desired image can be printed on the sheet member. ing.

The conventional method of manufacturing the sheet feeding roller 21 will be described with reference to FIGS. 12 and 13. First, the protrusion forming device 22 includes a V block 22 disposed on the lower side and an upper portion of the V block 23. And the punch unit 24 arranged in the above.
The punch unit 24 can be attached to a press or the like by attaching a pair of punches 26 and 26 to the left and right sides of the punch plate 25 in the figure.
The pair of punches 26, 26 are formed with a plurality of cutting blades 26a having sharp edges on the inner surfaces facing each other.

Then, a punching operation for positioning and placing the roller portion 21a of the sheet feeding roller 21 on the V block 23 and lowering the punch plate 24 by a predetermined amount is performed by the cutting blades 26a of the pair of punches 26 as shown in FIG. A plurality of protrusions 21c are formed in a row in the longitudinal direction of the outer peripheral portion of the roller portion 21a.
Thereafter, the punch plate 24 is raised to the position shown in FIG. C2, the sheet feeding roller 21 is rotated by a predetermined angle, and the punch plate 24 is lowered again, so that the punch plate 24 is lowered in the circumferential direction of the roller portion 21a. A plurality of protrusions 21c are formed in a line adjacent to the protrusions 21c.
By repeating such punching operation and rotating operation of the sheet feeding roller 21, a plurality of protrusions 21c are formed in the row direction and the circumferential direction of the outer peripheral portion of the roller portion 21a.

JP-A-10-109777

However, since the conventional sheet feeding roller 21 as described above repeats the punching operation of the punch plate 24 by the protrusion forming device 22 to form the protrusions 21c, it takes time to form the protrusions and increases the cost. there were.
In addition, since the protrusions 21c of the roller portion 21a having the rotation shaft 21b are formed, when the plurality of protrusions 21c are formed by the protrusion forming device 22, the height of the protrusions 21c is adjusted due to variations in the stroke on the press side. When the variation occurs, there is a possibility that the amount of protrusion 21c biting into the sheet member varies, and the sheet member feed amount varies.

  The present invention solves the above-described problems, and provides a sheet feeding roller that can easily form protrusions and is low in cost, and can keep the amount of protrusions biting into a sheet member constant. Objective.

  As a first means for solving the above problems, a sheet feeding roller of the present invention includes a sheet member having a predetermined width dimension, and a plurality of protrusions that can bite into the sheet member and transport the sheet member. A plurality of the protrusions are formed at a predetermined interval in the circumferential direction of the outer peripheral portion of the protrusion plate having a plate shape with a predetermined thickness and a circular outer shape. The hole is fitted and integrated with a rod-shaped rotating shaft.

  Further, as a second means for solving the above-mentioned problem, the protrusion plate has a protrusion of the adjacent protrusion plate positioned between the protrusion formed in the circumferential direction, and the plurality of protrusions. The protrusions are staggered.

  Further, as a third means for solving the above-mentioned problem, a part of the flat portion is projected and formed on the protruding plates adjacent to each other, and a concave portion is formed on one surface side and a convex portion is formed on the other surface side. The plurality of laminated projection plates are integrated by press-fitting the convex portion into the concave portion.

  In addition, as a fourth means for solving the above-described problem, a spacer having a predetermined thickness is disposed between the protruding plates adjacent to each other, and the protruding plate includes the protruding plate. The convex portion is formed with a concave portion that can be press-fitted and a convex portion that can be press-fitted and fitted into the concave portion of the projection plate.

  Further, as a fifth means for solving the above-mentioned problem, when the protrusion bites into the sheet member by a predetermined size, the outer periphery abuts on the sheet member and the spacer bites into the sheet member further. It is characterized by not being.

  Further, as a sixth means for solving the above-mentioned problem, in order to prevent the projection plate from being further bitten into the sheet member when the projection and the projection bite into the sheet member with a predetermined dimension. The sheet receiving portion is integrally formed.

  Further, as a seventh means for solving the above-described problem, the plurality of protrusions in plan view have a tip portion formed in a sharp shape and a bottom portion connecting the protrusion and the protrusion formed in an arc shape. It is characterized by.

The protrusion plate of the sheet feeding roller according to the present invention is formed by stacking a plurality of sheets and integrating the support hole formed at the rotation center with the rod-shaped rotation shaft so that the protrusion plate can be formed by punching. , It becomes easy to form protrusions. Therefore, the cost of the sheet feeding roller of the present invention can be reduced.
Further, by punching and forming the protruding plate, it is possible to provide a highly accurate sheet feeding roller in which the height dimension of the protrusion is not varied.

  In addition, the protrusion plate has a protrusion on the adjacent protrusion plate located between the protrusions formed in the circumferential direction, and a plurality of protrusions are staggered so that the sheet member can be gripped securely. Can do.

  In addition, the protruding plates adjacent to each other are formed by projecting a part of the flat portion to form a concave portion on one surface side and a convex portion on the other surface side, respectively. Since it is press-fitted into the recess and integrated, a plurality of protruding plates can be easily integrated into a semi-finished product, and assembly is easy.

  In addition, a spacer having a predetermined thickness is disposed between the protrusion plates adjacent to each other. The spacer includes a recess in which the protrusion of the protrusion plate can be press-fitted and the recess of the protrusion plate. Since there is a convex part that can be press-fitted into, the convex part can be press-fitted into the concave part and assembled easily as a semi-finished product even if there is a spacer between the adjacent projection plates. Can do.

  Also, when the protrusion bites into the sheet member by a predetermined dimension, the outer periphery abuts against the sheet member so that the spacer does not bite further into the sheet member, so that the variation in the feeding amount of the sheet member is eliminated. be able to.

  In addition, the protrusion plate is integrally formed with a protrusion and a sheet receiving portion for preventing the protrusion from biting into the sheet member when the protrusion bites into the sheet member with a predetermined dimension. Fewer sheet feeding rollers can be provided.

  Further, the shape of the plurality of protrusions in plan view is such that the tip part is formed in a sharp shape, and the bottom part connecting the protrusion and the protrusion is formed in an arc shape. Can be lengthened.

   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a front view of a sheet feeding roller according to the first embodiment of the present invention, FIG. 2 is a plan view of a protruding plate according to the first embodiment of the present invention, and FIG. 3 is a plan view of FIG. 4 is a side cross-sectional view of the main part, FIG. 4 is an enlarged cross-sectional view of the main part of the protrusion shown in FIG. 2, FIG. 5 is a plan view of the spacer according to the first embodiment of the present invention, and FIG. 5 is a side sectional view of FIG. 5, FIG. 7 is a side view for explaining the assembly of the projection plate and the spacer according to the first embodiment of the present invention, and FIG. 8 is the second embodiment of the present invention. FIG. 9 is a plan view of FIG. 8, and FIG. 10 is a front view for explaining a group of projection plates according to the second embodiment of the present invention.

First, as shown in FIG. 1, the sheet feeding roller 1 according to the first embodiment of the present invention is provided with a metal-made rod-shaped rotating shaft 2 at the center of rotation. A plurality of first projection plates 3 made of a metal plate having a thickness of approximately 0.2 mm are press-fitted and integrated with the rotary shaft 2 in a state of being laminated.
As shown in FIGS. 2 and 3, the first protruding plate 3 is formed by punching a metal plate with a press die or the like to form a substantially circular outer shape. In the circumferential direction of the outer peripheral portion of the substantially circular shape, A plurality of protrusions 3a are formed to protrude at a predetermined interval.
As shown in FIG. 2, the plurality of protrusions 3 a are formed in a sharp shape with a pointed tip, and an angle between the adjacent protrusions 3 a and the protrusions 3 a is approximately 6 degrees, for example. It is formed at intervals, and 60 of them are formed.

Since the first protruding plate 3 is formed by punching with a press die or the like, as shown in FIG. 4, the sagging due to the fracture surface 3g occurs in the corner portion, and the tip portion of the protrusion 3a is the plate. It is about half the thickness. For this reason, the shape of the tip of the protrusion 3a as viewed from the side is pointed visually.
Further, an oval-shaped support hole 3 c is punched and formed at the rotation center of the flat surface portion 3 b of the first projection plate 3, and the oval-shaped support hole 3 c is formed in a size that can be press-fitted into the rotary shaft 2.

Further, a part of the flat surface portion 3b protrudes (half punches) from the first protruding plate 3, and a pair of concave portions 3d is formed on one surface side, and a pair of convex portions 3e is formed on the other surface side.
An arcuate bottom 3f connecting the protrusion 3a and the protrusion 3a is formed on the outer periphery of the first protrusion plate 3.
The manufacturing method of the 1st projection board 3 of such a structure conveys the raw material which consists of a long-shaped (hoop shape) metal plate to a press die, and protrudes and forms the recessed part 3b and the convex part 3e in a primary process ( Half-punch), and the arc-shaped bottom portion 3f on the outer peripheral portion is punched and formed at intervals of 12 degrees, that is, for example, 30 pieces.

At this time, the first protruding plate 3 is transported to the next secondary process, with the portion where the bottom 3f is not punched connected to the raw material.
Then, the oval-shaped support holes 3c are punched in the secondary process, and the bottom 3f is punched between the bottom 3f formed at intervals of 12 degrees to form the bottom 3f at intervals of 6 degrees. 3 is separated from the raw material.
And the 1st projection board 3 cut | disconnected from the raw material is discharged | emitted out of a metal mold | die by extraction or adsorption | suction.

Since the punching direction of the bottom portion 3f performed in the primary process and the secondary process is punched from the same direction, the fractured surfaces 3g as shown in FIG. 4 are all formed on the same side. It has become.
In addition, since the bottom 3f of the outer peripheral portion has an arc shape, it is possible to eliminate the chipping or the like of a punch (not shown) for punching the bottom 3f.

Further, between the first projection plate 3 and the first projection plate 3 adjacent to each other, for example, a spacer 4 made of the same metal plate as the first projection plate 3 and having the same thickness is disposed.
The spacer 4 has a circular outer shape, and is formed with a support hole 4b having an oblong shape that is the same as the support hole 3c of the first protrusion plate 3 in the flat portion 4a.
Further, the flat portion 4a has a pair of concave portions 4c into which the convex portions 3e of the first projection plate 3 can be press-fitted and a pair of convex portions 4d capable of press-fit into the concave portions 3d of the first projection plate 3. The protrusion is formed (half punch).
The spacer 4 has a circular outer diameter that is smaller by 0.1 to 0.2 mm than the outer diameter of the first projection plate 3.

By pressing the protrusion 3e of the first protrusion plate 3 into the recess 4c of the spacer 4, the first protrusion plate 3 and the spacer 4 are integrated as shown in FIG. In the first projection plate group 5 in which a plurality of first projection plates 3 and spacers 4 are stacked and integrated (unitized), the support holes 3c and 4b at the rotation center can be press-fitted into the rotation shaft 2. ing.
The first protrusion plate group 5 is formed by arranging protrusions 3 a and protrusions 3 a adjacent to each other via a spacer 4 in the column direction.
Alternatively, the first projection plate group 5 includes a plurality of projections 3a of the projection plate 3 adjacent to each other through the spacer 4 between the projections 3a formed in the circumferential direction of the projection plate 3 and the projections 3a. The protrusions 3a may be staggered.

In addition, as shown in FIG. 1, a roller portion 6 having a predetermined length is sandwiched between the protruding plate group 5 and the protruding plate group 5, and a plurality of protrusions 3 a are pierced by the outer peripheral portion of the roller portion 6. The sheet member of the non-existing portion is pressed and the sheet member is deformed such as bulging so that paper jam or the like does not occur.
Further, stopper members 7 and 7 are press-fitted into the rotating shaft 2 outside the first protruding plate group 5, and the first protruding plate group 5 is fixed to the rotating shaft 2. The roller portion 6 and the stopper member 7 are formed to have the same outer diameter as the spacer 4, and the top of the protrusion 3 a of the first protrusion plate 3 is 0 from the outer periphery of the spacer 4, the roller portion 6, and the stopper member 7. The sheet feeding roller 1 according to the first embodiment of the present invention is configured to protrude from 0.05 mm to 0.1 mm.

In the sheet feeding roller 1 according to the first embodiment of the present invention having such a configuration, the rotary shaft 2 is pivotally supported by a bearing portion of a printer or the like, and the pressure contact roller is provided on the protrusion 3 a on the outer peripheral portion of the first protrusion plate 3. (Not shown) are in pressure contact.
When a sheet member (not shown) made of recording paper or the like is conveyed between the sheet feeding roller 1 and the pressure roller, the sheet member is nipped between the sheet feeding roller 1 and the pressure roller. Then, the plurality of protrusions 3a bite into the sheet member by 0.05 to 0.1 mm, and the sheet member is gripped by the plurality of protrusions 3a.

In this case, the outer peripheral surfaces of the spacer 4, the roller portion 6, and the stopper member 7 serve as a sheet receiving portion, and the protrusion 3 a does not bite into the sheet member any more. For this reason, the sheet member can be stably conveyed without variation in the feeding amount of the sheet member.
Thereafter, when the sheet feeding roller 1 is rotationally driven, the sheet member gripped by the protrusion 3a is conveyed to a printing unit inside the printer, and a desired image is printed on the sheet member.
In the sheet feeding roller 1 according to the first embodiment, since the first protruding plate 3 is formed by punching a metal plate by pressing or the like, the outer peripheral protrusion 3a can be formed by punching, The protrusion plate 3 can be easily formed.
Therefore, the cost of the sheet feeding roller 1 can be reduced. Moreover, the height dimension of the protrusion 3a can be formed uniformly without variation.

Although the sheet feeding roller 1 according to the first embodiment of the present invention has been described as having a plurality of protruding plates 3 and spacers 4 stacked alternately, the protruding plates 3 are stacked directly next to each other (see FIG. (Not shown).
The protrusion plates 3 combined in this way are arranged in a staggered manner by positioning the protrusions 3a of the adjacent protrusion plates 3 between the protrusions 3a formed in the circumferential direction and the protrusions 3a. Thereby, the grip force of the sheet member can be improved.

Further, since the sheet feeding roller (not shown) of the second embodiment of the present invention is different only in the first protruding plate group 5 described in the first embodiment, only this portion will be described.
First, a plurality of second projecting plates 12 as shown in FIGS. 8 and 9 are stacked on the first projecting plate group 5 shown in FIG. 1 and integrated as shown in FIG. The protruding plate group 13 is fixed to the rotary shaft 2.

The second protruding plate 12 is formed to have a thickness approximately twice that of the first protruding plate 3, for example, 0.4 mm. And the outer peripheral part of the 2nd projection board 12 is formed in two steps by forming a protrusion 12a having a sharp tip and a sheet receiving part 12b having a smaller outer diameter than the protrusion 12a.
Further, an oval shaped support hole 12c into which the rotary shaft 2 can be press-fitted is punched and formed in the flat surface portion 12c of the second protruding plate 12. Then, a pair of recesses 12d are provided by protruding formation (half punch) at two locations on the flat surface portion 12c on the side where the sheet receiving portion 12b is formed, and on the opposite flat surface portion 12c where the recess 12d is formed. Has a protruding portion 12e.
An arc-shaped bottom 12f is formed between the adjacent protrusions 21a and 12a, and the protrusions 12a and 12a are connected by the bottom 12f.

The manufacturing method of the 2nd projection board 12 of such a structure conveys the raw material which consists of an elongate metal plate to a press die, and protrudes and forms the recessed part 12d and the convex part 12e at a primary process, and an outer peripheral part. For example, 30 arcuate bottom portions 12f are punched out at intervals of 60 degrees.
Thereafter, the oval shaped support holes 3c are punched in the secondary process, and the bottom 12f is punched and formed between the bottom 12f and the bottom 12f formed in the primary process, so that the projections 12a are formed at intervals of 6 degrees. The second protruding plate 12 is separated from the raw material.

The second projecting plate 12 separated from the raw material is transported to the tertiary process with the support hole 12c guided by a mold, and in this tertiary process, the top of the projection 12a is crushed to approximately half the plate thickness. As a result, the sheet receiving portion 12b and the top of the protruding portion 12a bulge outward from the sheet receiving portion 12b.
As a result, the outer diameter of the top of the protrusion 12a is approximately 0.1 to 0.2 mm larger than the outer diameter of the sheet receiving portion 12b.
Thereafter, the second projection plate 12 is discharged outside the mold by releasing the guide of the support hole 12c.

A plurality of the second protrusion plates 12 manufactured in this way are stacked, and the convex portions 12e are press-fitted into the concave portions 12d, thereby integrating the multiple second protrusion plates 12 as shown in FIG. The second protruding plate group 13 is formed.
The second protruding plate group 13 is press-fitted into the rotary shaft 2 and is sandwiched between the roller portion 6 and the stopper member 7 shown in FIG. 1, and is a sheet feeding roller (not shown) of the second embodiment. Is assembled.
In the sheet feeding roller according to the second embodiment, since the protrusion 12a and the sheet receiving portion 12b are integrated to form the second protrusion plate 12, the number of parts can be reduced and the number of assembling steps can be reduced. can do.

FIG. 3 is a front view of the sheet feeding roller according to the first embodiment of the present invention. It is a top view of the projection board concerning the 1st Embodiment of this invention. FIG. 3 is a side sectional view of a main part of FIG. 2. It is a principal part expanded sectional view of the protrusion shown in FIG. It is a top view of the spacer concerning the 1st Embodiment of this invention. It is side surface sectional drawing of FIG. It is a side view explaining the assembly of the projection plate and spacer concerning the 1st Embodiment of this invention. It is principal part sectional drawing of the projection board concerning the 2nd Embodiment of this invention. It is a top view of FIG. It is a front view explaining the projection board group concerning the 1st Embodiment of this invention. It is a front view of a conventional sheet feeding roller. It is principal part sectional drawing explaining the manufacturing method of the conventional sheet feeding roller. It is principal part sectional drawing explaining the manufacturing method of the conventional sheet feeding roller.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sheet feed roller of 1st Embodiment 2 Rotating shaft 3 1st projection plate 3a Protrusion 3b Planar part 3c Support hole 3d Concave part 3e Convex part 3f Bottom part 3g Broken surface 4 Spacer 4a Flat part 4b Support hole 4c Concave part 4d Convex part 5 First projection plate group 6 Roller portion 7 Stopper member 8
12 2nd projection board 12a Projection 12b Spacer part 12c Plane part 12d Concave part 12e Convex part 12f Bottom part 13 Second projection board group

Claims (7)

A sheet member having a predetermined width dimension, and a plurality of protrusions capable of biting into the sheet member and transporting the sheet member; A plurality of protrusion plates are formed at predetermined intervals in the circumferential direction of the portion, and the support plate formed at the rotation center by stacking a plurality of the plates is integrated by being fitted to a rod-shaped rotation shaft. Sheet feed roller The protrusion plate is characterized in that the protrusions of the adjacent protrusion plate are positioned between the protrusions formed in the circumferential direction and the protrusions are staggered. The sheet feeding roller according to 1. The protruding plates adjacent to each other are formed by protruding a part of a flat surface portion to form a concave portion on one surface side and a convex portion on the other surface side. The sheet feeding roller according to claim 1 or 2, wherein the sheet feeding roller is integrated by being press-fitted into the recess. A spacer having a predetermined thickness is disposed between the protruding plates adjacent to each other, and the protruding portion of the protruding plate can be press-fitted into the spacer and the protruding plate. The sheet feeding roller according to claim 3, wherein a convex portion that can be press-fitted into the concave portion is formed. 5. The spacer according to claim 4, wherein, when the protrusion bites into the sheet member with a predetermined size, an outer peripheral portion abuts on the sheet member and does not bite into the sheet member any more. Sheet feeding roller. The protrusion plate is integrally formed with the protrusion and a sheet receiving portion for preventing the protrusion from biting into the sheet member when the protrusion bites into the sheet member with a predetermined dimension. The sheet feeding roller according to any one of claims 1 to 3. The shape of the plurality of protrusions in plan view is such that a tip end portion is formed in a sharp shape and a bottom portion connecting the protrusion and the protrusion is formed in an arc shape. Sheet feed roller.

Images