JP2006008360A - Paper feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper feeding device capable of preventing adhesion of dust generated by cleaning a pick-up roller to a recording paper sheet during printing or before printing. <P>SOLUTION: In this paper feeding device 1, a paper feeding pad 8 formed by fitting a friction member 9 having large friction resistance against the recording paper sheet 2 to one surface side thereof is arranged in a push-up plate 4 provided at a position opposite to the pick-up roller 7, and a cleaning member 10 to be elastically brought in pressure-contact with the peripheral surface of the pick-up roller 7 for cleaning is fitted to the other surface of the paper feeding pad 8. The paper feeding pad 8 is rotatably supported by the push-up plate 4, and formed possible to turn over one and the other surfaces thereof. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a paper feeding device, and more particularly to a paper feeding device capable of picking up recording paper stored in a paper feeding cassette one by one and feeding it to printing means.

A conventional paper feeding device will be described based on Patent Document 1. As shown in FIGS. 7 and 8, the paper feeding device has a plurality of recording sheets in a paper feeding cassette 21 whose upper side is opened. Y is stacked and stored.
The recording sheet Y is placed on the push-up plate 22 and urged upward by the urging force of the spring 23, and the corner portion is pressed against the separation claw 24.
Further, a pickup roller 26 having a rotation shaft 25 is disposed above the recording paper Y placed on the push-up plate 22, and the outer peripheral surface 26 a of the pickup roller 26 is biased upward by the spring 3. The uppermost recording sheet Y is in pressure contact.

The pickup roller 26 is rotated by the rotation of the motor 27 being transmitted to the rotary shaft 25 via gears 28 and 29, whereby the uppermost recording paper Y is picked up and is fed to a predetermined printing means (not shown). Paper can be fed.
A brush 30 as a cleaning member is always in contact with the outer peripheral surface 26a of the pickup roller 26, and the brush 30 cleans the outer peripheral surface 26a when the pickup roller 26 rotates.
JP 05-229681 A

However, in the conventional paper feeding device, the brush 30 is always in contact with the outer peripheral surface 26a of the pickup roller 26 to remove dust and clean it, so that the dust removed from the outer peripheral surface 26a Drops on and adheres to the recording paper Y before or during printing.
The dust that has fallen onto and attached to the recording paper Y before or during printing is fed to the printing means together with the recording paper Y and printed on the image. However, since the dust is attached, the printed image There was a risk that the quality of the product would deteriorate.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper feeding device that solves the above-described problems and prevents dust generated by cleaning a pickup roller from adhering to a recording paper during printing or before printing.

  As a first means for solving the above problems, a paper feeding device according to a first embodiment of the present invention includes a paper feeding cassette capable of storing a plurality of recording papers, and the recording stored in the paper feeding cassette. A push-up plate capable of pushing up the paper, and a pickup roller capable of picking up the recording paper pushed up by the push-up plate one by one, and the push-up plate at a position facing the pickup roller has the recording paper On the other hand, a sheet feeding pad having a friction member having a large frictional resistance attached to one surface is disposed, and the other surface of the sheet feeding pad is in contact with the outer peripheral surface of the pickup roller for cleaning. The sheet feeding pad is rotatably supported by the push-up plate so that the one and the other surfaces can be turned upside down. That.

  Further, as a second means for solving the above problem, the sheet feeding pad that is picking up the recording sheet has the recording sheet placed on the friction member with the one surface facing the pickup roller. When the recording sheet to be picked up exceeds the predetermined number of sheets and the recording sheet runs out on the friction member, the sheet feeding pad is rotated so that the other surface faces the pickup roller. The cleaning member is in elastic contact with the outer peripheral surface of the pickup roller.

  As a third means for solving the above problem, the sheet feeding pad is locked to rotate when either the friction member or the cleaning member faces upward and faces the pickup roller. It is characterized by.

  In addition, as a fourth means for solving the above-described problem, a paper feeding device according to the second embodiment of the present invention has a paper feeding cassette capable of storing a plurality of recording papers, and is stored in the paper feeding cassette. A push-up plate capable of pushing up the recording paper; and a pickup roller capable of picking up the recording paper pushed up by the push-up plate one by one. The push-up plate at a position facing the pickup roller includes the recording plate A sheet feeding pad having a friction member having a large frictional resistance with respect to the sheet and a cleaning pad having a cleaning member that performs cleaning while elastically contacting the outer peripheral surface of the pickup roller can be exchanged.

  Further, as a fifth means for solving the above problem, the sheet feeding pad that is picking up the recording sheet has the recording sheet placed on the friction member, and the recording sheet to be picked up is a predetermined number of sheets. When the recording paper is no longer on the friction member as described above, the paper feed pad is replaced with the cleaning pad, and the cleaning member is elastically contacted with the outer peripheral surface of the pickup roller. And

  Further, as a sixth means for solving the above-mentioned problem, the cleaning member is made of a nonwoven fabric or a brush.

A cleaning member for performing cleaning by elastic contact with the outer peripheral surface of the pickup roller is attached to the other surface of the paper feed pad according to the first embodiment of the present invention, and the paper feed pad is rotated up. Since one side and the other side can be turned upside down supported by the plate, the cleaned cleaning member faces downward, and the cleaned dust can be dropped downward from the pickup roller. Therefore, it is possible to prevent the cleaned dust from adhering to the recording paper during printing or before printing. Therefore, the recording paper can be surely picked up and conveyed to the printing means side without slipping.
In addition, the operability is good because the friction pad and the cleaning member can be switched by rotating the paper feed pad with the paper feed pad attached to the push-up plate.

  Also, when the recording paper to be picked up exceeds the predetermined number and there is no recording paper on the friction member, the paper feeding pad is rotated so that the other surface faces the pickup roller and the cleaning member is the outer peripheral surface of the pickup roller. Therefore, the pick-up roller can be cleaned at a predetermined interval, and the pick-up roller can always be kept free of dust.

  Further, since the rotation of the paper feed pad is locked when either the friction member or the cleaning member faces upward and faces the pickup roller, the paper feed pad is locked when the recording paper is picked up and the pickup roller is cleaned. be able to. Therefore, the recording paper pickup and the pickup roller can be reliably cleaned.

  In addition, the push-up plate related to the paper feeding device according to the second embodiment of the present invention has a paper feed pad having a friction member having a large frictional resistance against the recording paper, and is cleaned by elastic contact with the outer peripheral surface of the pickup roller. Since the cleaning pad having a cleaning member that performs cleaning can be replaced, after the pickup roller is cleaned, the cleaning pad is replaced with a paper feeding pad, so that the pickup roller can be attached to the recording paper during feeding or before feeding. Thus, it is possible to reliably prevent the cleaned dust from adhering to the surface.

  Further, the paper feed pad that is picking up the recording paper has a paper feed pad when the recording paper is placed on the friction member, and when the recording paper to be picked up exceeds a predetermined number and no recording paper is left on the friction member. Since the cleaning member is elastically contacted with the outer peripheral surface of the pickup roller, the dust generated during cleaning can be prevented from adhering to the recording paper.

  Further, since the cleaning member is made of a non-woven fabric or a brush, dust adhering to the pickup roller can be reliably cleaned with the cleaning member.

   Hereinafter, an embodiment of a paper feeding device 1 according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining the first embodiment of the present invention, FIG. 2 is a schematic diagram for explaining the reverse operation of the paper feed pad according to the present invention, and FIG. 3 is a plan view of the main part of FIG. FIG. 4 is a perspective view of the paper feed pad according to the first embodiment of the present invention, and FIGS. 5 and 6 are schematic diagrams for explaining the second embodiment of the present invention.

First, the paper feeding device 1 of the present invention is provided with a paper feeding cassette 3 having a housing (not shown) that can store a plurality of recording papers 2 made of cut paper of a predetermined size, for example. In the paper feed cassette 3, a flat plate-like push-up plate 4 on which a plurality of recording papers 2 can be placed is disposed.
The push-up plate 4 is rotatable in the vertical direction on the left side in the figure with a support part (not shown) on the right side in the figure as a fulcrum.

Further, the push-up plate 4 is formed with a rectangular opening 4a having a width dimension A as shown in FIG. 3 at a position facing a pickup roller 7 to be described later. A pair of crosspieces 4b and 4b are formed with a predetermined width dimension adjacent to the side surface of the frame. A pair of pad support portions 5 and 5 are formed on the outside of the crosspieces 4b and 4b by cutting and bending the push-up plate 4.
And the blank hole 4c is formed in the push-up board 4 of the trace which the pad support part 5 was cut and bent.

Further, as shown in FIGS. 1 and 2, the pad support portion 5 formed by cutting and bending the push-up plate 4 is open at the right side in the drawing by the entrance portion 5a to form a cantilever support shape. The pad support portion 5 is connected to the entrance portion 5a, and has a first support portion 5b and a second support portion 5c formed of two circular arcs formed from the entrance portion 5a side to have an arch shape.
The push-up plate 4 is elastically biased toward the upper pickup roller 7 by an elastic member 6 made of a coil spring disposed on the bottom plate (not shown) of the housing.

The pick-up roller 7 is covered with a member having a large frictional resistance such as rubber, and the pickup roller 7 can be rotated in a clockwise direction indicated by an arrow B by a driving source such as a motor. Further, as shown in FIG. 4, the pair of pad support portions 5 and 5 can be snapped and supported by a rotating shaft 8b of the paper feed pad 8.
The paper feed pad 8 has a base 8a having a rectangular shape with a width C smaller than the width A of the opening 4a of the push-up plate 4 shown in FIG. 3, and the front-rear direction of the base 8a. A rotating shaft 8b having a predetermined length is formed to protrude.

  In addition, as shown in FIG. 4, the sheet feeding pad 8 has a friction member 9 having a large frictional resistance, such as cork, fixed to one surface (upper side in the drawing) of the base 8a with an adhesive or the like. A cleaning member 10 made of a brush or the like that can be cleaned while elastically contacting the outer peripheral surface of the pink up roller 7 is fixed to the other surface (the lower surface in the drawing). In such a sheet feeding pad 8, when the rotary shaft 8b is positioned at the entrance 5a of the pad support 5 and a sliding load is applied in the direction of arrow D, the pad support 5 is elastically deformed upward in an arch shape. Thus, the rotary shaft 8b is snap-supported on the first support portion 5b.

As shown in FIG. 2, the paper feed pad 8 supported by the first support portion 5 b has a base 8 a having a width dimension C positioned substantially at the center of the opening 4 a of the push-up plate 4 having a width dimension A.
For this purpose, the paper feed pad 8 is rotatable in the direction of arrow E or in the opposite direction about the rotation shaft 8b.
Further, the diameter of the rotary shaft 8b is slightly smaller than the thickness of the base 8a, and the paper feed pad 8 has a backlash in the axial direction of the rotary shaft 8b when snapped on the first support portion 5b. It is regulated by the opening 4a.

Further, when a slide load in the direction of arrow D is further applied to the paper feed pad 8 supported by the first support portion 5b, the rotating shaft 8b slides from the first support portion 5b to the second support portion 5c, and the second support. The part 4c is snap-supported.
As shown in FIGS. 1 and 3, the sheet feeding pad 8 at this time protrudes from the opening 4 a at one end, which is the left end of the base 8 a, and rides on the surface of the push-up plate 4.
Therefore, the sheet feeding pad 8 is restricted from rotating in the direction of arrow E. That is, the sheet feed pad 8 is configured to lock the rotation in the direction of arrow E when either the friction member 9 or the cleaning member 10 faces upward and faces the pickup roller 7.

The sheet feeding operation of the recording sheet 2 in the sheet feeding apparatus 1 according to the first embodiment will be described. First, in a state where the rotation shaft 8b of the sheet feeding pad 8 is snap-supported on the first support portion 5b. As shown in FIG. 2, the base 8a is rotated so that the friction member 9 is upward and the cleaning member 10 is downward.
When a sliding load in the direction of arrow D is applied to the sheet feeding pad 8 in this state, and the rotating shaft 8b of the sheet feeding pad 8 is snapped to the second support portion 5c, the friction member 9 is located at a position facing the pickup roller 7. The slide stops.
At the same time, the feed pad 8 is positioned on the push-up plate 4 so that the left end portion of the base 8a protrudes from the opening 4a, and rotation in the direction of arrow E is restricted.

A plurality of recording papers 2 are placed on the paper feed pad 8 in this state, the push-up plate 4 is raised by the urging force of the elastic member 6, and the recording paper 2 is brought into elastic contact with the pickup roller 7. Thereafter, when the pickup roller 7 is rotationally driven in the direction of arrow B, the uppermost sheet of recording paper 2 is picked up and fed in the direction of arrow F.
The recording paper fed in the direction of arrow F is printed with a desired image by printing means downstream of the paper feed cassette 3 in the paper feeding direction.
When the number of recording sheets 2 picked up during printing exceeds a predetermined number and the recording sheets 2 are no longer on the friction member 9 of the sheet feeding pad 8, the push-up member 4 is resisted against the urging force of the elastic member 6. And let it descend.

Thereafter, a load in the direction opposite to the arrow D is applied to the paper feed pad 8 to move the rotating shaft 8b from the second support portion 5c to the first support portion 5b, and the base 8a is rotated in the direction of arrow E to clean the cleaning member. 10 is turned upward, and the friction member 9 is turned downward.
Then, the paper feed pad 8 is moved again in the direction of the arrow D, the rotary shaft 8b is snap-engaged with the second support portion 5c, the cleaning member 10 is opposed to the pickup roller 7, and the push-up plate 4 is raised. Let
Then, the cleaning member 10 comes into elastic contact with the outer peripheral surface of the pickup roller 7, and the outer peripheral surface of the pickup roller 7 that rotates in the direction of arrow B is cleaned.

Since the sheet feeding apparatus 1 according to the first embodiment of the present invention cleans the pickup roller 7 after the recording sheet 2 is no longer in the sheet feeding cassette 3, during or before printing as in the prior art. High-quality image printing can be performed without the cleaned dust adhering to the recording paper 2.
Further, the dust that has been cleaned by the cleaning member 10 and dropped onto the cleaning member 10 from the pickup roller 7 is rotated onto the cleaning pad 10 by rotating the paper feed pad 8 at the time of feeding, so that it falls onto the cleaning member 10. The collected dust does not fall down and adhere to the recording paper 2 being printed.

In the first embodiment of the present invention, the pad support portion 5 is described as being integrally formed by cutting and bending a part of the push-up plate 4. However, the pad support portion 5 is separate from the push-up plate 4. It may be formed of a material and fixed to the push-up member 4 with an adhesive or the like.
Moreover, although the friction member 9 was demonstrated with cork, what is necessary is just a thing with large frictional resistance, such as rubber | gum. Furthermore, although the cleaning member 10 has been described with a brush, the cleaning member 10 may be a non-woven fabric or the like having a coarse mesh.

The paper feeding device 11 according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. A paper feeding cassette 13 having a housing (not shown) that can store the recording paper 2 is arranged. A flat push-up plate 14 is disposed inside the paper feed cassette 13. The push-up plate 14 is formed with a rectangular opening 14a having a predetermined size at a position facing the pickup roller 7.
A paper feed pad 15 as shown in FIG. 5 and a cleaning pad 16 as shown in FIG. 6 can be exchanged in the opening 14a.

The sheet feeding pad 15 has a base 15a and a friction member 15b made of cork or the like fixed to the upper surface of the base 15a with an adhesive or the like. Further, a hook portion 15c that can be snap-supported to the opening portion 14a is formed at the lower portion of the base 15a.
The cleaning pad 16 has a base 16a and a cleaning member 16b made of a brush or the like fixed to the upper surface of the base 16a with an adhesive or the like. Further, similarly to the paper feed pad 15, a hook portion 16c is formed at the lower portion of the base 16a so that the cleaning pad 16 can be snapped onto the opening portion 14a.

Then, the paper feed pad 15 is attached to the opening 14 a, a plurality of recording papers 2 are placed on the friction member 15 b, the push-up plate 14 is raised by the urging force of the elastic member 6, and the recording paper 2 is loaded. Elastically contacts the pickup roller 7.
Thereafter, as in the first embodiment, when the pickup roller 7 is rotationally driven in the direction of arrow B, the recording paper 2 can be picked up and fed in the direction of arrow F.

When the number of recording sheets 2 picked up exceeds a predetermined number and the recording sheets 2 are no longer on the friction member 15b, the push-up member 4 is lowered against the urging force of the elastic member 6. Thereafter, the sheet feeding pad 15 is taken out from the opening 14a, and the cleaning pad 16 is snap-supported and attached to the opening 14a, and the push-up plate 14 is raised.
Then, the cleaning member 16b comes into elastic contact with the outer peripheral surface of the pickup roller 7, and the outer peripheral surface of the pickup roller 7 that rotates in the direction of arrow B is cleaned.

  In the sheet feeding device 11 according to the second embodiment of the present invention, dust that has been cleaned by the cleaning member 16b and dropped onto the cleaning member 16b is supplied together with the cleaning pad 16 when the cleaning pad 16 is replaced. Since it is taken out of the paper device 11, it is possible to reliably prevent dust generated during cleaning from adhering to the recording paper 2 during printing or before printing.

It is the schematic explaining the 1st Embodiment of this invention. It is the schematic explaining the reverse operation | movement of the paper feed pad concerning this invention. It is a principal part top view of FIG. It is a perspective view of the paper feed pad concerning a 1st embodiment of the present invention. It is the schematic explaining the 2nd Embodiment of this invention. It is the schematic explaining the 2nd Embodiment of this invention. It is a principal part perspective view of the conventional paper feeder. It is principal part sectional drawing of the conventional paper feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feeder 2 of 1st Embodiment Recording paper 3 Paper feed cassette 4 Push-up board 4a Opening part 4b Crossing part 4c Blank hole 5 Pad support part 6 Elastic member 7 Pickup roller 8 Paper feed pad 8a Base 8b Rotating shaft 9 Friction member 10 Cleaning member 11 Paper feeder of the second embodiment

Claims (6)

  A paper feed cassette capable of storing a plurality of recording papers, a push-up plate capable of pushing up the recording paper housed in the paper feed cassette, and a pickup capable of picking up the recording paper pushed up by the push-up plate one by one The push-up plate at a position opposite to the pickup roller is provided with a paper feed pad having a friction member having a large frictional resistance with respect to the recording paper on one surface side. The other surface of the pad is attached with a cleaning member that elastically contacts the outer peripheral surface of the pickup roller for cleaning, and the sheet feeding pad is rotatably supported by the push-up plate, and the one and other surfaces A paper feeding device characterized in that it can be turned over.   The sheet feeding pad that is picking up the recording sheet has the recording sheet placed on the friction member with the one surface facing the pickup roller, and the recording sheet to be picked up is a predetermined number or more. When the recording sheet runs out on the friction member, the sheet feeding pad is rotated so that the other surface faces the pickup roller and the cleaning member is placed on the outer peripheral surface of the pickup roller. The sheet feeding device according to claim 1, wherein the sheet feeding device is in contact with the sheet feeding device.   3. The sheet feeding device according to claim 1, wherein rotation of the sheet feeding pad is locked when either the friction member or the cleaning member faces upward and faces the pickup roller. 4.   A paper feed cassette capable of storing a plurality of recording papers, a push-up plate capable of pushing up the recording paper housed in the paper feed cassette, and a pickup capable of picking up the recording paper pushed up by the push-up plate one by one The push-up plate at a position facing the pickup roller is provided with a feed pad having a friction member having a large frictional resistance with respect to the recording paper, and is elastically contacted with the outer peripheral surface of the pickup roller for cleaning. A sheet feeding device, wherein a cleaning pad having a cleaning member to be performed is replaceable.   In the paper feeding pad that is picking up the recording paper, the recording paper is placed on the friction member, the recording paper to be picked up exceeds a predetermined number, and the recording paper is no longer on the friction member. 5. The paper feeding device according to claim 4, wherein the paper feeding pad is replaced with the cleaning pad so that the cleaning member elastically contacts the outer peripheral surface of the pickup roller. The sheet feeding device according to claim 1, wherein the cleaning member is made of a nonwoven fabric or a brush.

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