JPH08169603A - Mounting structure of driven roller - Google Patents

Abstract

PURPOSE: To facilitate mounting of a driven roller onto a paper guide and prevention of thrust dislocation with a single roller without need for additional preparation of a fixing tool and holding device. CONSTITUTION: At a paper guide 8 made of resin, a shaft passing recessed part 17 which is recessed from the front side of the paper guide 8 to serve as a bearing part for receiving both the ends of a shaft 11a used in a driven roller 11 and can pass through both the ends of a shaft 11a from the guide rear side is formed for a thrust prevention part for preventing movement in the axial direction. A claw 19 which is engaged with a peripheral groove 22 farmed at the roller shaft 11a beforehand is integrally-formed. It is thus possible to provide easy mounting and positioning only with a single roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a driven roller which is mounted on a paper guide and installed in a paper conveying path.

[0002]

2. Description of the Related Art In a document reading unit or a recording unit of an image recording apparatus such as a facsimile apparatus or the like having a paper transport mechanism, a driven roller (press roller) is driven by a driving roller (feed roller or the like) in the paper path path. And the like) are arranged so as to feed the paper. Of these, in many cases, the driven roller that is rotated and driven by the driving roller is attached to the corresponding portion of the paper guide that forms the paper path without rotation.

FIG. 11 shows an example of a structure in which a driven roller is attached to a paper guide. The driven roller 52 mounted from the back side of the paper guide 50 is a paper guide 50.
Between the shaft support members 54, 54 provided with the roller shafts 53, 53 on both sides of the guide shaft while being incorporated so that a part of the peripheral surface thereof projects from the window hole 51 provided on the guide surface. Then, the leaf springs 55, 55 for elastically supporting the shafts 53, 53 upwardly are attached to the intermediate portions of the shafts 53, 53 by screwing 56, 56 to hold the rollers and prevent thrust. I am trying.

[0004]

However, in these conventional mounting structures, the number of parts required for mounting and positioning the driven roller is large, and the number of assembling steps required for them is also large. If the number of driven rollers to be used is large, an increase in cost as a whole is raised as a problem that cannot be ignored.

The present invention focuses on the problems of the present situation,
(EN) Provided is an improved mounting structure in which a driven roller is attached to a paper guide and thrust deviation prevention is devised so that it can be easily carried out by a single roller without requiring a separately provided fixture or holder. .

[0006]

According to the present invention, as a roller mounting structure for achieving the above object, a paper guide made of resin is provided with a bearing portion for receiving both end portions of the shaft of a driven roller and a movement in the axial direction. The thrust prevention portion for blocking is provided by integral molding.

As a specific example of the bearing portion, there is a bearing portion which is provided as a recess from the front surface side of the paper guide and is formed as an axial passage recess portion through which both ends of the shaft can be inserted from the back surface side of the guide. Further, as a specific example of the thrust prevention portion, there is a thing formed as a claw piece that engages with a circumferential groove provided in advance on the roller shaft. In addition, in order to facilitate molding on one side or both sides of the shaft recess,
It is desirable to open the through hole.

[0008]

In the above roller mounting structure, the driven roller is inserted into the bearing portion integrally formed with the paper guide from the back side with respect to the paper guide, and the thrust is also integrally formed with the paper guide. Mounting and positioning can be performed simply by engaging the parts.

[0009]

EXAMPLES The roller mounting structure according to the present invention will be described in detail below with reference to examples.

First, FIG. 1 shows an outline of a facsimile apparatus 1 which adopts a document U-turn system for a reading section 2 as a preferred application example of a roller mounting structure according to the present invention. In this type of facsimile apparatus 1, the document set on the document feed tray 3 is fed along the circumference of a round U-turn guide 4 included in the reading section 2 to finish the image reading. The original document is discharged onto a paper discharge tray 5 arranged immediately below the document paper feed tray 3 (see arrow P in FIG. 1).

FIG. 2 shows the structure of the reading unit 2, which includes a cover 6
A manuscript is provided between the U-turn guide 4 mounted to be openable and closable about the same axis S and the paper guides 7 and 8 provided on the cover 6 side and the main body 1 side so as to surround the U-turn guide 4. Is formed, and a large number of drive rollers (feed rollers) 10 driven by a built-in motor 9 are arranged in the U-turn guide 4, while those on the paper guides 7 and 8 side. And a driven roller (press roller) 11 which is in rolling contact with each other. These driven rollers 11 are individually attached to the paper guides 7 and 8 at predetermined positions, but since the number of attachments is large, simplification of the attachment structure to the paper guides 7 and 8 is required.

In addition, in FIG. 2, reference numeral 12 is a separation roller that is in rolling contact with the driving roller 10 at the document feeding position, and 13 is a feeding roller arranged in front of it. However, the drive roller 10 to which the separation roller 12 is rollingly contacted is composed of a retard roller having a built-in torque limiter, and rotates normally when the separation roller 12 is in direct contact with the separation roller 12 or when only one sheet of paper is introduced between both rollers. However, when a plurality of sheets are introduced, they are configured to rotate in reverse. Further, 14 is a document reading window opened at the middle bottom of the paper guide 8 on the main body 1 side, and 15 is a reading glass attached on the reading window.

An improved mounting structure for the driven roller 11 is shown in FIGS. These are application examples for the three driven rollers 11 attached to the paper guide 8 on the main body 1 side in FIG.

The paper guide 8 is formed by resin molding into a substantially trapezoidal shape which is recessed downward when viewed from the side.
The document reading window 14 is opened in the middle bottom portion thereof, and one driven roller 11 is provided at a predetermined position of an inclined portion which is on the upstream side with respect to the paper path direction indicated by an arrow P in FIG.
Similarly, two driven rollers 11, 11 are attached to the respective predetermined positions of the slanted portion which hits the downstream side from the back side of the guide so as to protrude through the window holes 16 toward the front side of the guide.

These driven rollers 11 have bearing portions 17 and 17 and a thrust prevention portion 19, which are integrally formed on the back side of the paper guide 8 made of resin, without using a separate fixture or holder. By this, it is designed to be mounted freely in a fixed position.

That is, on the back surface side of the paper guide 8 which comes into contact with the roller mounting portion, an arcuate shaft mounting groove 20 for receiving both side shafts 11a, 11a of the driven roller 11 from both sides of the window hole 16 is provided and {FIG. (See (b)),
At both ends thereof, shaft receiving recesses 17 recessed from the front surface side of the paper guide 8 are provided as bearing portions for receiving both ends of the shaft 11a of the driven roller 11 (see FIG. 5). This shaft passage recess 17 has through holes 18, 18 on both sides thereof on one side (the right side in FIG. 3) corresponding to the pre-insertion side of the roller shaft 11a, and the shaft mounting groove 20 is formed on both sides thereof.
The roller shaft 1
On the opposite side (left side in FIG. 3) of the post-insertion side of 1a, a through hole 18 is opened on one side thereof to form an axial through hole which is opened to the shaft mounting groove 20 on one side thereof (FIG. 4 ( a)
reference).

In the middle of the shaft mounting groove 20 extending to one side of the window hole 16 (left side in FIG. 3), the axial movement of the roller shaft 11a inserted into and supported by the shaft recesses 17 on both sides is set. As a thrust preventing portion for blocking, an elastic claw piece 19 formed by opening a through hole 21 having a U-shape in a top view is provided around the periphery (see FIG. 6). This nail piece 19
Is a circumferential groove 2 which is previously provided on the roller shaft 11a.
The roller shaft 11a is engaged with the roller shaft 11a and serves as a thrust stopper.
The shaft mounting groove 20 having a diameter substantially the same as the shaft diameter has a small projection 19a having a diameter substantially equal to the circumferential groove. Although the thrust prevention portion is provided only on one side of the roller shaft 11a in the embodiment, it can be provided on both sides.

If the above-described mounting structure is adopted, the driven roller 11 is exposed through the window hole 16 from the back surface side of the paper guide 8 while the roller shaft 11a is provided with the shaft recesses 1 on both sides.
7 and 17 are inserted and supported, and then the circumferential groove 22 of the shaft 11a is engaged with the small projection 19a of the claw piece 19,
The driven roller 11 can be easily attached and positioned in the axial direction. That is, unlike the conventional structure, it is characterized in that it does not require any additional fixing tool or holding tool for mounting and positioning (preventing thrust displacement).

Further, in the above-mentioned embodiment, the through holes 18 are formed in one side or both sides of each shaft passage recess 17, and it is necessary to provide one side or both sides of the shaft passage recess 17 on the back side of the guide. Since the shaft through hole is formed simultaneously with the through hole 18, one feature is that a slide core is not required when integrally forming the shaft through recess 17. By the way, each part of the paper guide 8 shown in FIG. 3 is devised so that it can be molded with a mold that is divided into upper and lower halves, including the parts described later.

Next, other improvements made to the paper guide 8 shown in FIG. 3 will be briefly described together.

First, with the intention of simplifying the attachment of the reading glass 15 to the reading window 14 of the paper guide 8 and preventing rattling, the upper edge of the glass is provided on the upstream side as shown in FIGS. 7 and 8. While being pressed to the downstream side by the claws 26 having the spring function, the pressing claws 25 are fixed from both sides, and on the downstream side, as shown in FIG. It is designed to be locked from. With this mounting structure, the reading glass 15 does not need to be screwed, and the floating of the reading glass 15 on the downstream side and the rattling in the vertical and thrust directions are reliably prevented. Further, there is no gap between the lower edge of the glass and the guide surface, and there is no possibility that the conveyed document is caught at the downstream connecting portion.

As for the vertical ribs 30 for the paper guides, which are spaced apart from each other on the guide surface, the connection structure between the vertical ribs 30 on the upstream side and the reading glass surface is improved as shown in FIG. . That is, in this connection structure, the lower end of the vertical rib 30 is provided with the protruding portion 30a that overlaps the glass surface, so that it is possible to reliably prevent the conveyed original from being caught at the upstream connecting portion. I have to.

[0023]

As described above, in the roller mounting structure of the present invention, the resin paper guide has the bearing portion for receiving both ends of the shaft of the driven roller and the thrust prevention for preventing the axial movement. Since the part and the part are integrally formed, the driven roller can be easily attached to and positioned on the paper guide without using any fixture or holder. Therefore, particularly when applied to a paper transport mechanism having a large number of driven rollers, a considerable cost reduction can be achieved by reducing the number of parts and the number of assembling steps.

[Brief description of drawings]

FIG. 1 is a partially cutaway schematic front view of a facsimile machine showing an example of a device to which the present invention is applied.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a plan view of a paper guide showing an embodiment.

4A is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 4B is a bottom view of FIG.

5 is a sectional view taken along the line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is a sectional view taken along the line DD of FIG.

8 is a cross-sectional view taken along the line EE of FIG.

9 is a sectional view taken along the line FF of FIG.

10 is a sectional view taken along the line GG in FIG.

FIG. 11 is a rear view of a guide showing a conventional example of a structure for attaching a driven roller to a paper guide.

[Explanation of symbols]

 1 Facsimile Machine (Main Body) 2 Reading Section 3 Original Paper Feed Tray 4 U Turn Guide 5 Paper Ejection Tray 6 Cover 7 Paper Guide 8 Paper Guide 9 Built-in Motor 10 Drive Roller (Feed Roller) 11 Driven Roller (Press Roller) 11a Roller Shaft 12 Separation Roller 13 Retracting Roller 14 Original Reading Window 15 Reading Glass 16 Window Hole 17 Bearing Part (Shaft through Recess) 18 Through Hole 19 Thrust Prevention Part (Elastic Claw Piece) 19a Small Protrusion 20 Shaft Mounting Groove 21 Through Hole 22 Circumference Groove 25 Holding Claw 26 Claw 27 Holding Claw 30 Vertical Rib 30a Projection

Claims (3)

[Claims] 1. A driven roller attached to a resin paper guide, wherein the paper guide is integrally provided with a bearing portion for receiving both ends of a shaft of the driven roller and a thrust prevention portion for preventing movement in the axial direction. A driven roller mounting structure characterized by being formed by molding. 2. The bearing portion is formed of an axial recess formed on the front surface side of the paper guide, and the thrust prevention portion is formed of a claw piece that engages with a circumferential groove formed in the roller shaft. The mounting structure described. 3. The mounting structure according to claim 2, wherein a through hole is opened on one side or both sides of the shaft passage recess.