JPH0977303A - Sheet transport device - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a sheet conveying device capable of realizing a paper jam processing excellent in workability and visibility. A sheet conveying path is formed by a first guide member and a second guide member provided at a predetermined distance from the first guide member, and the second guide member forms the sheet conveying path. In a sheet conveying device that can have a sheet conveying position for forming a sheet and a conveying path opening position for opening the sheet conveying path, first holding means for holding the second guide member at the sheet conveying position, and the first holding means. 2 is a sheet conveying device having a second holding unit for holding the second guide member at the conveyance path open position.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, and the like.

[0002]

2. Description of the Related Art FIG. 7 shows the overall structure of a conventional image forming apparatus.

The present image forming apparatus is an electrophotographic system capable of double-sided copying in which both front and back surfaces of one sheet material are copied and multiple copying in which the same surface of one sheet material is copied a plurality of times. This is a copy machine.

The image forming apparatus includes a plurality of paper feed cassettes 1.
5 and 16 and these paper feed cassettes 15 and 1
The sheet materials S of different sizes, which are stacked and housed in the sheet 6, are selectively fed to the transfer portion.

The sheet materials S stacked and stored in the sheet feeding cassette 15 or 16 are sequentially fed out from the uppermost sheet material by the feeding rollers 17 or 19 which rotate in the arrow direction. Then, the feeding roller 17 or 19
The sheet material S fed out by is separated one by one by the separation roller pair 20 or 21 which rotates in the arrow direction, and is fed to the registration roller pair 22 whose rotation is stopped.

When the leading edge of the sheet material S fed by the separating roller pair 20 or 21 hits the nip of the registration roller pair 22, a predetermined loop is formed and the skewed state is corrected.

After that, the sheet material S whose skewed state has been corrected
Is transferred to the transfer portion between the photosensitive drum 4 and the transfer charger 34 by the registration roller pair 22 which starts to rotate in the arrow direction at the timing of aligning the position with the toner image on the photosensitive drum 4 rotating in the arrow direction. The toner image on the photosensitive drum 4 is transferred onto the sheet surface by the transfer charger 34.

In this image forming apparatus, the image of the original 3 set on the platen glass 5 is an optical image formed by the illumination lamp 6, reflection mirrors 7, 8, 9, 10, 11, 12 and the zoom lens 13. The image is projected onto the photosensitive drum 4 rotating in the direction of the arrow by the system. The electrostatic latent image formed on the photosensitive drum 4 by this is the color toner supplied from the first developing device 32 or the second developing device 33.
The toner image is visualized by the black toner supplied from the developer.

The sheet material S after the transfer of the toner image at the transfer portion is transferred to a plurality of conveying rollers 23A, 23B and 23C.
The sheet is conveyed to the fixing device 25 by the conveying device (first sheet material conveying path) 23 and the toner image is fixed on the sheet surface by the identification fixing device 25.

The sheet material S after the fixing process of the toner image is completed.
Is the transport roller 24 when the single-sided copy is in the front-side paper discharge mode.
Is sent to the discharge roller pair 27 by the discharge roller pair 2
The sheet is discharged onto a sheet discharge tray (not shown) outside the apparatus with the image surface facing upward by 7. At this time, the flapper 26 arranged at the branch portion is switched to the position of 26a.

Further, in the case of single-sided copying in the back side discharge mode, the sheet material S after the fixing process of the toner image has its image side facing downward, so that the sheet is temporarily reversed by the conveying roller 24.
Sent to 8. At this time, the flapper 26 has been switched to the position 26b. Then, when a sensor (not shown) detects that the trailing edge of the sheet material has passed through the flapper 26, the flapper 26 is switched to the position of 26a, and the conveying roller pair 35 rotates in the direction opposite to the arrow direction (reverse rotation). )
By doing so, the sheet material S is sent to the paper discharge roller pair 27, and is discharged onto the paper discharge tray outside the apparatus with the image surface facing downward by the paper discharge roller pair 27.

Further, in the double-sided copy mode, the sheet material S after the fixing processing of the toner image is circulated with the image surface inside so that the sheet material S is circulated by the conveying roller 24.
7, and the sheet is once conveyed to the sheet discharge tray outside the apparatus by the sheet discharge roller pair 27. At this time, the flapper 26 is 26
It has been switched to the position a. When a sensor (not shown) detects that the trailing edge of the sheet material has passed the flapper 26, the flapper 26 is switched to the position of 26b,
In addition, the sheet discharge roller pair 27 rotates (reversely) in the direction opposite to the arrow direction, so that the sheet material S passes through the reversing path 28 with the image surface inside (the second sheet). It is sent to the material conveying path) 19.

In the case of the multiple copy mode, the sheet material S after the fixing process of the toner image is sent to the reversing path 28 by the conveying roller 25 in the state where the image is an external image, and passes through the reversing path 28. And is sent to the re-feeding path 29. At this time, the flapper 26 has been switched to the position 26b.

The sheet material S sent to the re-feed path 29 is
It is sent again to the registration roller pair 22 by the pair of transport rollers 35, 30, 30.

In this image forming apparatus, the re-feeding path 29
Are formed by upper and lower guides (path forming members) 36 and 37 arranged at a predetermined interval.

FIG. 8 is an enlarged view showing the relationship between the transfer device 23, which is the first transfer path from the transfer charger 34 to the fixing device 25, and the retransfer path 29, which is the second transfer path located just below the transfer device 23. Indicates.

In the figure, the re-transfer route is composed of an upper guide 36 and a lower guide 37. The upper guide 36 and the lower guide 37 have a re-feeding roller pair 30 for conveying the paper, which are pressed against each other with a predetermined pressure by a pressing means (not shown). The upper guide 36 has a rotation center 38 on the inner side of the main body as shown in FIG. 9 which is a cross-sectional view seen from the direction B.
It is configured to be rotatable around and opened by operating the handle 39. A magnet catch 40 is provided near the handle 39 on the front side of the retransfer path to prevent the upper guide 36 from opening due to the pressure applied by the roller 30. As a result, the upper guide 36 and the lower guide 37 are normally provided with a predetermined size. Is kept at an interval of.

When a paper jam occurs and it is necessary to remove the paper in the retransfer path, the handle is lifted up to pull the magnetic catch away from the lower guide 37, and the upper guide 36 is opened upward. Increase the space in the transfer path and clear the paper jam.

[0019]

However, in such a conventional structure, the workability is poor because the upper guide must be held by one hand so as not to drop while the other hand is used to clear the paper jam. Also, there is a drawback that one hand holding the upper guide 36 is obstructed and the paper in the retransfer route cannot be seen well.

[0020]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet conveying apparatus which is excellent in workability and visibility and can realize paper jam processing.

According to the structure of the present invention for achieving the above object, the sheet conveying path is formed by the first guide member and the second guide member provided at a predetermined distance from the first guide member. In the sheet transporting device, the second guide member can be set to a sheet transporting position for forming a sheet transporting path and a transporting path open position for opening the sheet transporting path. A sheet conveying device having a first holding means for holding and a second holding means for holding the second guide member at the conveyance path open position.

[0022]

1 is an enlarged view of a retransfer path of a copying machine embodying the present invention, and FIG. 2 is a cross-sectional view of the retransfer path portion as viewed in the direction of arrow A. As shown in FIG.

In the figure, the re-transfer route is the upper guide 36 (second guide member) and the lower guide 37 (first guide member).
It is composed of The upper guide 36 and the lower guide 37 have a re-feeding roller pair 30 for transporting the paper, and the rollers 30C and 30d are urged downward by a pressing means (not shown) so as to press each other with a predetermined pressure. There is.

The upper guide 36 is rotatable about a rotation center 38 on the inner side of the main body, and is operated upward by opening a sheet conveying position forming a sheet conveying path by operating a handle 39. It has become.

A handle 39 is provided at substantially the center of the upper guide 36, and a magnet catch 40 is further provided so that the first attracting surface 40a as the first holding means attracts to the lower guide 37 as the magnetic member. As a result, the distance between the upper guide 36 and the lower guide 37 is maintained at a predetermined amount against the pressing force of the roller.

In the lower part of the first conveying path 23, a holding plate 41 as a magnetic member is provided at a position corresponding to a second attracting surface attracting surface 40b as the second retaining means on the side opposite to the lower guide 37 of the magnet catch. Is provided.

When handling a paper jam in the retransfer path 29, the handle 39 is lifted and the magnetic catch 40 is pulled.
The first suction surface 40a and the lower guide 37 are separated from each other, and the upper guide 36 is rotated about the support shaft 38. When the magnet catch 40 is rotated by a predetermined angle, the second attraction surface 40b of the magnet catch 40 is attracted to the holding plate 41, and the upper guide 36 is held at the conveyance path open position where the sheet conveyance path is opened.

By carrying out the paper jam processing in this state, the operator can take a free posture and can carry out the processing by using both hands. Further, since there is nothing that hinders the visibility, the visibility is improved.

(Embodiment 2) FIG. 3 is an enlarged view of a handle portion according to a second embodiment of the present invention.

In this embodiment, the handle 39 is the upper guide 3
Fulcrum 3 provided near the magnet catch 40 on 6
It is provided so that it can be rotated by a small angle around 6a.

Protrusions 39a and 39b are provided near the fulcrum 36a of the handle 39.

When opening the upper guide 36, a handle 39 is provided.
When the tip 39c of the handle is lifted up, the handle 39 becomes a fulcrum 36
The protrusion 39a contacts the lower guide 37 by rotating around a. When further raised, the protrusion 39a and the lower guide 37
Is used as the fulcrum, and the handle tip 39c is used as the fulcrum
6a (that is, the vicinity of the magnet catch 40) acts as a lever to amplify the force for lifting the handle and separate it from the magnet catch 40 and the lower guide 37.
The 0 can be torn off (Figure 4).

When closing the opened upper guide 36,
When the handle tip 39c is pulled down, the handle 39 moves to the fulcrum 36
The protrusion 39b contacts the holding plate 41 by rotating around a.
Similar to the case of lifting, the magnet catch 40 and the holding plate 41 are peeled off by a slight force by the lever principle in which the contact point between the protrusion 39b and the holding plate 41 is the fulcrum, the tip 39c of the handle is the force point, and the fulcrum part 36a is the action. be able to.

The upper guide 36 is opened or closed by making the handle 39 rotatable around the fulcrum 36a in the vicinity of the magnet catch 40 and providing projections 39a and 39b near the fulcrum 36a in the vertical direction as in the present embodiment. Sometimes you don't have to put extra force to peel off the magnetic catch, which improves workability. In addition, it is possible to eliminate the risk that the upper guide 36 will hit the lower guide 37 and the holding plate due to excessive momentum, resulting in damage to components.

(Embodiment 3) FIG. 6 is an enlarged view of a handle portion according to a third embodiment of the present invention.

In this embodiment, the handle 39 has a spring 39.
Latches 39e and 39f that are biased to the left by the action of g and slide in the direction of arrow B by the button 39d are provided. The upper guide is urged upward by an urging means (not shown), and when the upper guide 36 is closed, the latch 39f engages with the engaging hole 37b of the lower guide 37 so that the upper guide 36 and the lower guide 37 are separated from each other. It keeps constant. Button 39 to open the upper guide 36
By pressing d, the engagement between the latch 39f and the engagement hole 37b is released, and the upper guide 36 is lifted. Upper guide 36
When is lifted by a predetermined angle, the latch 39e engages with the engaging hole 41a of the holding plate 41 to prevent the upper guide 36 from falling.

When closing the upper guide 36, the button 3
9d is pushed to release the engagement between the latch 39e and the engagement hole 41a to lower the upper guide 36.

According to the present embodiment, the work of pushing the button is inferior to the magnet catch of the above-described embodiment, but there is an effect that the upper guide can be held more reliably.

[0039]

As described above, by providing the first and second holding means for holding the guide plate that opens and closes at the sheet feeding position and the transport path opening position, a paper jam excellent in workability and visibility can be obtained. Processing can be realized.

Further, by providing the holding release means interlocked with the opening / closing operation of the guide, the operability of the paper jam processing can be further improved.

[Brief description of drawings]

FIG. 1 is a diagram of a retransmission path according to a first embodiment of this invention.

FIG. 2 is a cross-sectional view of the retransfer path according to the first embodiment of this invention.

FIG. 3 is an enlarged view of a handle portion according to the second embodiment.

FIG. 4 is an operation explanatory diagram of the second embodiment.

FIG. 5 is an operation explanatory diagram of the second embodiment.

FIG. 6 is an explanatory diagram of the third embodiment.

FIG. 7 is an explanatory view of a conventional example.

FIG. 8 is an explanatory view of a conventional example.

FIG. 9 is an explanatory view of a conventional example.

[Explanation of symbols]

 36 Upper guide 37 Lower guide 38 Support point 39 Handle 40 Magnet catch 41 Holding plate

Claims (6)

[Claims] 1. A sheet conveying path is formed by a first guide member and a second guide member provided at a predetermined distance from the first guide member, and the second guide member comprises: In a sheet transporting device capable of having a sheet transporting position for forming a sheet transporting path and a transporting path open position for opening a sheet transporting path, first holding means for holding the second guide member at the sheet transporting position and the first holding means. A sheet conveying apparatus having a second holding unit that holds the second guide member at the conveying path open position. 2. The sheet conveying apparatus according to claim 1, wherein the second guide means opens the conveying path by rotating about a shaft parallel to the sheet conveying direction on the inner side of the main body. 3. The sheet conveying apparatus according to claim 1, wherein the first or second holding means comprises at least one magnet and a magnetic body corresponding to the magnet. 4. The sheet conveying apparatus according to claim 1, wherein the first holding means or the second holding means is a latch. 5. The first and second holding means are composed of a magnet having a plurality of attraction surfaces provided on the second guide, and first and second magnetic members respectively corresponding to the attraction surfaces. Item 3. The sheet conveying device. 6. A handle which is rotatably supported around a fulcrum provided near the holding means on the second guide, and is provided near the fulcrum on the handle and on the side opposite to the operating portion of the handle with respect to the fulcrum. 6. The sheet conveying device according to claim 3, further comprising: another protrusion, wherein the protrusion is brought into contact with a fixed portion of the main body to serve as a fulcrum of the lever when the handle is rotated to release the first holding unit.