JPH07215536A - Reverse paper feeder - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the paper is jammed at any of a plurality of paper path parts, the jam can be easily removed without breaking the paper. [Structure] The guide member 30 is composed of a plurality of guide members 4, 8 and 9 forming a plurality of paper path portions 31 and 32 in the reversing paper feeding portion 40, and each guide member 4, 8
Is rotatable about the rotation fulcrums 4a and 8a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing paper feeding device, and more particularly to a reversing paper feeding device having a reversing paper feeding unit for reversing a conveying direction of a paper fed from the inside of a paper accommodation unit by a paper feeding means.

[0002]

2. Description of the Related Art As a conventional reverse sheet feeding device of this type,
For example, there is one as shown in FIG.
048, etc.). That is, this reverse sheet feeding device 1
Reference numeral 00 designates a guide member 104 to reverse the conveying direction of a transfer material 103 as a sheet fed from the inside of a sheet cassette 102 as a sheet accommodating section by a sheet feeding roller 101 as a sheet feeding unit, and an optical system (see FIG. Registration roller pair 10 as registration means that operates in synchronization with (not shown)
It leads to 5.

The guide member 104 includes the inner guide member 106, the outer guide member 107, and the exterior member 10.
8 is provided with an engagement pin 109 and an inversion guide member 111 engaged with an engagement groove 110, forms a paper path portion 112, and forms an inversion paper feeding portion R. The reversal sheet feeding section R reverses the conveyance direction of the transfer material 103.

In the reverse paper feeding apparatus 100, the paper path unit forming the reverse paper feeding unit R, as described in Japanese Utility Model Publication No. 4-12048 or the like, from the viewpoint of jam handling property (see FIG. 6). If a jam occurs at 112, the exterior member 1
08 may be rotated about the rotation fulcrum 113,
Since the reversal guide member 111 also rotates about the rotation fulcrum 114 by the engagement of the engagement pin 109 and the engagement groove 110, the exterior member 108 pivots largely downward and provides a space for jam clearance. Is configured to.

[0005]

In recent years, there is a paper feed cassette as a multi-stage paper accommodating section, and as an option, a paper feed cassette is installed under the main body of an image forming apparatus to which a reverse paper feed device is mounted. It is becoming common to wear them.

At this time, the above-mentioned conventional reverse sheet feeding device 10 is used.
If the paper feed cassette is a two-stage paper feed cassette (not shown) in No. 0, the reversal paper feed section R of the transfer material 103 has two paper path sections (not shown) inside and outside the reversal guide member 111. Therefore, when the transfer material 103 is jammed at the paper path portion outside the reversal guide member 111, the reversal guide member 111 is also opened in conjunction with the opening of the exterior member 108, so that the transfer material 103 may be broken. .

The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to easily and without breaking the paper even if the paper is jammed in any of a plurality of paper path portions. An object of the present invention is to provide a reversal sheet feeding device capable of handling jam.

[0008]

In order to achieve the above object, in the present invention, a reversing sheet feeding section in which a guide member reverses the conveying direction of the sheet fed from the inside of the sheet accommodating section by the sheet feeding means. In the reverse paper feeding device having
The guide member is configured by a plurality of guide members that form a plurality of paper path portions in the reversal paper feeding unit, and each guide member is rotatable about a rotation fulcrum. .

The guide member includes an inner guide member, an exterior member, and an inversion guide member arranged between the exterior member and the inner guide member, and the inner guide member and the inversion guide member are provided. To form a first paper path portion in the reversing paper feeding portion, form a second paper path portion in the reversing paper feeding portion with the reversing guide member and the exterior member, and also to install the exterior member and the reversing guide. It is preferable that the member is rotatable around each rotation fulcrum, and that the reversal guide member has its center of gravity disposed inside the main body of the apparatus from the vertical line of the rotation fulcrum.

Further, it may be provided with a registration means which operates in synchronism with an optical system for guiding the sheet reversed by the reversing sheet feeding section.

[0011]

In the reversing paper feeding device having the above structure, when the paper is jammed at the reversing paper feeding portion, each guide member can be rotated around the rotation fulcrum depending on the jam position. As in the prior art, the jam processing can be performed smoothly without breaking the paper jammed on the outside of the inversion guide member.

Further, among the guide members, the center of gravity of the reversing guide member forming the first and second paper path portions is arranged inside the apparatus main body from the vertical line of the rotation fulcrum, so that the inside of the reversing guide member is When the paper is jammed in the first paper path portion, it is automatically rotated and opened by the elastic force due to the paper being reversed, and provides a space for jam clearance. If the paper is jammed in the second paper path portion on the outside of the sheet, the reversing guide member is held at the regular position without rotating, and therefore the jammed paper can be removed without breaking the jammed paper. I can do it.

[0013]

1 is a schematic view showing the internal structure of a copying machine as an image forming apparatus equipped with a reversing paper feeding device according to an embodiment of the present invention. An optical system 2 including a mirror and a lens, an image forming section 3 including a photoconductor drum as an image carrier, a charging charge, a developing device, a cleaner, and the like, and are mounted below the image forming section 3. A reversing paper feeding device 20 for feeding the transfer materials 13 as sheets one by one from the paper accommodating portion, a fixing portion 11, and a conveyor belt 10 for conveying the transfer material 13 on which an image is formed to the fixing portion 11. Is equipped with.

FIG. 2 is a diagram showing in detail the structure of the reversing paper feeding device 20. In the reversing paper feeding device 20, the paper accommodating portion is in two stages, and the first paper accommodating portion in the upper stage is the first. It has a paper feed cassette 12 and a second paper feed cassette 12a as a lower paper storage unit.

The reversing paper feeding device 20 includes a first paper feeding roller 5 as a paper feeding means for feeding the transfer material 13 housed in the first paper feeding cassette 12 to the image forming section 3 side, and a second paper feeding roller 5. The second paper feed roller 7 as a paper feed means for feeding the transfer material 13 stored in the paper cassette 12a to the image forming section 3 side.
And first and second separation pads 6 and 6a as separating means for feeding the transfer materials 13 one by one by the first paper feeding roller 5 or the second paper feeding roller 7, the inner guide member 9, and the exterior member 4. , And a guide member 30 composed of the reversing guide member 8 disposed between the exterior member 4 and the inner guide member 9, and a pair of registration rollers as registration means that operates in synchronization with the optical system 2. 14 and.

The transfer member 13 fed from the first paper feed roller 5 is different in the feeding direction between the guide portion 91 of the inner guide member 9 and the inner guide portion 81 of the reversing guide member 8. A first paper path portion 31 is formed which is oriented, that is, inverted and guided to the registration roller pair 14. The outer guide portion 82 of the reversing guide member 8 and the guide portion 41 of the exterior member 4 direct the transfer material 13 fed from the second feeding roller 7 via the vertical path 16 in the feeding direction. The second paper path unit 3 which is reversed to lead to the registration roller pair 14
Forming 2. Further, on the downstream side in the reverse sheet feeding, the guide portion 41 of the exterior member 4 and the guide portion 91 of the inner guide member 9 join the first and second paper path portions 31 and 32 to the registration roller pair 14. The leading paper path portion 33 is formed.

The first and second paper path units 31 and 32 and the paper path unit 33 form a reversal paper feeding unit 40. A registration roller pair 14 that operates in synchronization with the optical system 2 is provided on the downstream side of the reversal sheet feeding unit 40.

Next, the operation of the copying machine main body 1 equipped with the reversing sheet feeding device 20 having the above-mentioned structure will be described.

First, the transfer material 13 stored in the first paper feed cassette 12 is fed by the first paper feed roller 5, and then one transfer sheet separated by the first paper feed roller 5 and the separation pad 6 is transferred. The material 13 includes the first and second paper path units 31, 3
The reverse direction in which the transfer material 13 is fed along the guide portion 41 of the exterior member 4 through the first paper path portion 31 between the reverse guide member 8 also serving as the second guide portion and the inner guide member 9. Guided to the registration roller pair 14 and then to the image forming section 3 through the conveyance path and then conveyed by the conveyance belt 10 and the fixing section 11 where the image is transferred.
It is fixed at 3 and discharged.

Similarly, the transfer material 13 fed from the second paper feed roller 7 passes through the vertical path 16 and passes between the outer guide portion 82 of the reversing guide member 8 and the guide portion 41 of the exterior member 4. It is sent to the registration roller pair 14 through the second paper path unit 32, and an image is formed as in the case of the first paper feed roller 5.

The exterior member 4 and the reversal guide member 8 will now be described. The exterior member 4 has a guide portion 41 for the second paper path portion 32 and is configured to be rotatable around the rotation fulcrum 4a. Has become. Further, the reversing guide member 8 has an inner guide portion 81 and an outer guide portion 82 for forming the first paper path portion 31 and the second paper path portion 32, and can rotate about the rotation fulcrum 8a. Further, the center of gravity 8b of the reversing guide member 8 is arranged inside the reversing sheet feeding device main body from the vertical line of the rotation fulcrum 8a. Since the center of gravity 8b is thus arranged on the inner side of the reversing sheet feeding device main body from the vertical line of the rotation fulcrum 8a, the center of gravity 8b leans against the abutting portion 15 provided in the reversing sheet feeding device main body, and is reversed. Guide member 8
Is positioned with respect to the main body of the reverse sheet feeding device.

Here, if the transfer material 13 is stopped at the reversing paper feeding section 40 for some reason, the jam processing is performed as follows.

First, as shown in FIG. 3, when the transfer material 13 fed by the first paper feed roller 5 is jammed at the first paper path unit 31 of the reverse paper feed unit 40, the exterior member 4 is first treated as a jam process. Rotate and open. Then, the reversal guide member 8 which has been fixed and whose movement in the rotation direction is regulated by the exterior member 4 becomes free in the opening direction, and the reversal guide member 8 leaning on the abutting portion 15 by the center of gravity 8b transfers the transfer material 13 to the transfer material 13.
Is automatically rotated by the elastic force due to being inverted, and provides a space for jam clearance. After the jam processing is finished, the reversal guide member 8 is also pushed and closed by closing the exterior member 4, the center of gravity 8b is positioned by the abutting portion 15 of the reversal sheet feeding device main body, and is fixedly held by the exterior member 4, Recovered to the state.

Next, as shown in FIG. 4, when the transfer material 13 fed by the second paper feed roller 7 is jammed at the second paper path portion 32 of the reverse paper feed portion 40, the exterior member 4 is rotated. When opened, the jammed transfer material 13 appears, and jam processing is performed. At this time, since the center of gravity 8b of the reversing guide member 8 is arranged inside the reversing sheet feeding device main body with respect to the vertical line of the rotation fulcrum 8a, the reversing guide member 8 does not rotate and remains in the normal position.
After the jam processing, the exterior member 4 is closed to recover the normal state.

In the reversing sheet feeding device having the above-mentioned structure, the exterior member 4 and the reversing guide member 8 are pivotal fulcrums 4a, 8a.
Since it can be rotated around the center, it is possible to easily perform the jam processing without breaking the transfer material 13 when the paper is jammed by the second paper path unit 32 as in the prior art.

Further, since the center of gravity 8b of the reversing guide member 8 is arranged inside the main body of the reversing paper feeding device from the vertical line of the rotation fulcrum 8a, when the transfer material 13 is jammed in the first paper path portion 31. , The transfer material 13 is automatically rotated and opened by the elastic force due to being reversed, and provides a space for jam clearance, while the transfer material 13 is jammed in the second paper path portion 32. In this case, since the reversal guide member 8 is held at the regular position without rotating, the jammed transfer material 13 is not broken.

Further, since the registration roller pair 14 is provided on the downstream side of the reversing sheet feeding section 40, the apparatus is downsized in the conveying direction of the transfer material 13 by the first and second sheet feeding rollers 5 and 7. Can be achieved.

In the above embodiment, the first and the first sheet feeding means are provided.
Although the second paper feed rollers 5 and 7 are provided below the image forming unit 3, as another embodiment, the exterior member 4 is used.
May have multiple sheet feeding means. This multi-sheet feeding means is provided with a sheet feeding port in the exterior member 4 and the sheet feeding section, the sheet feeding means, and the separating means similar to those in the above-described embodiment are arranged in the sheet feeding port. It passes through the reverse sheet feeding section 40. By providing such a multi-sheet feeding means, it is possible to use a different size from the size of the sheets in the first and second sheet feeding cassettes 12 and 12a, or a different material such as OHP.

Further, in the above embodiment, the reverse sheet feeding section forming the first and second sheet path sections has been described as an example having the two-step sheet accommodating section. The present invention is not limited to the one having the same, and can be similarly applied to the one having a plurality of paper accommodating portions having three or more stages.

[0030]

As described above, when a sheet is jammed at the reverse sheet feeding portion, each guide member can be rotated about the rotation fulcrum according to the jam position, which is the same as in the prior art. Moreover, there is an effect that the jam processing can be smoothly performed without breaking the jammed paper on the outside of the reversing guide member.

Further, since the center of gravity of the reversing guide member forming the first and second paper path portions of the guide member is arranged inside the reversing sheet feeding device main body from the vertical line of the rotation fulcrum.
When the paper is jammed in the first paper path inside the reversal guide member, the elastic force due to the reversal of the paper causes the paper to automatically rotate and open to provide a space for jam clearance. On the other hand, when the paper is jammed in the second paper path portion outside the reversing guide member, the reversing guide member is held at the regular position without rotating, so the jammed paper may be broken. There is an effect that jam can be smoothly processed without doing.

Further, the sheet feeding means is provided with a registration means that operates in synchronization with an optical system for guiding the sheet reversed by the reverse sheet feeding section, that is, since it is provided on the downstream side of the reverse sheet feeding section. It is possible to reduce the size of the device in the paper conveyance direction.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a copying machine as an image forming apparatus incorporating a reversing paper feeding device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the reverse sheet feeding device of FIG.

FIG. 3 is a cross-sectional view of a jam processing state in a first paper path unit of the reverse paper feeding unit.

FIG. 4 is a cross-sectional view of a jam processing state in a second paper path unit of the reverse paper feeding unit.

FIG. 5 is a cross-sectional view of a conventional reverse sheet feeding device.

FIG. 6 is a cross-sectional view of a conventional reverse sheet feeding device in a jammed state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copier (image forming apparatus) 2 Optical system 3 Image forming part 4 Exterior member 41 Guide part 4a Rotation fulcrum 5 1st paper feeding roller (paper feeding means) 6 1st separation pad (separation means) 6a 2nd separation pad (Separating means) 7 Second paper feeding roller (paper feeding means) 8 Inversion guide member 81 Inner guide portion 82 Outer guide portion 8a Rotation fulcrum 8b Center of gravity 9 Inner guide member 91 Guide portion 10 Conveyor belt 11 Fixing portion 12 First feeding Paper cassette (paper accommodating portion) 12a Second paper feeding cassette (paper accommodating portion) 13 Transfer material (paper) 14 Registration roller pair (registration means) 15 Abutting portion 16 Vertical path 20 Reverse feeding device 30 Guide member 31 Third 1 paper path unit 32 second paper path unit 33 paper path unit 40 reverse sheet feeding unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65H 15/00 E

Claims (3)

[Claims] 1. A reversing paper feeding apparatus having a reversing paper feeding section for reversing a conveyance direction of a paper fed from the inside of a paper accommodation section by a paper feeding means by a guide member, wherein the guide member is provided in the reversing paper feeding section. A reversing sheet feeding device comprising a plurality of guide members forming a plurality of paper path portions, each guide member being rotatable about a rotation fulcrum. 2. The guide member includes an inner guide member, an exterior member, and a reversal guide member arranged between the exterior member and the inner guide member, and the inner guide member and the reversal guide member. To form a first paper path portion in the reversing paper feeding portion, form a second paper path portion in the reversing paper feeding portion with the reversing guide member and the exterior member, and also to install the exterior member and the reversing guide. 2. The member according to claim 1, wherein the member is rotatable about each rotation fulcrum, and the reversal guide member has a center of gravity located inside the apparatus main body on a vertical line of the rotation fulcrum. Reverse paper feeder. 3. The reversing sheet feeding device according to claim 1, further comprising a registration unit that operates in synchronization with an optical system that guides the sheet reversed by the reversing sheet feeding unit.