JP2000072275A - Sheet carrying device and sheet processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a driven roller abut against a driving roller in a parallel relation even if a closed door is not parallel with the driven roller in paired carrying rollers in which the driving roller is mounted to the side of an image forming device main body, and the driven roller is mounted to the door side. SOLUTION: The driving roller 106a of paired carrying rollers is mounted to the side of an image forming device main body, and a driven roller 106b is mounted to the side of a door 107 capable of being revolved in the vertical direction around a pivot 108. Two independent arm shaped roller holders 120 (120) capable of being revolved in the vertical direction around a pivot 120-1 are mounted to the door 107, and the driven roller 106b is supported by these roller holders 120 (120) at both its ends.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a sheet conveying apparatus provided in a sheet processing apparatus for performing a predetermined process on a fed sheet.

[0002] Representatives of the sheet processing apparatus referred to here include, for example, image forming apparatuses (copiers, printers, and copiers) that form images on fed recording materials (sheets).
Facsimile) and a document image reading device that reads an image of a fed document (sheet).

[0003]

2. Description of the Related Art FIGS. 11 and 12 show the overall structure of a conventional image forming apparatus (electrophotographic copying machine).

[0004] First, referring to FIG.
The overall configuration of 00A will be briefly described. Here, description will be made along the flow of the sheets S fed one by one from the cassette 101.

In the cassette 101, a support shaft 103 at the rear end is provided.
It is attached so that it can rotate up and down around the center,
Further, an intermediate plate 102 whose tip end is urged upward by a push-up spring (not shown) is provided. On the intermediate plate 102, a sheet S as a recording material is stacked.

[0006] Sheets S stacked on the middle plate 102
Are fed in order from the top sheet by the sheet feed roller 104 rotating in the counterclockwise direction. The fed sheet S is separated from the separation / feed roller pair 105 (105).
a, 105b) and the transport roller pair 106 (106a, 1).
06b), and reaches the registration roller pair 109 (109a, 109b) in the rotation stopped state.

The sheet S that has reached the registration roller pair 109 is transferred by the registration roller pair 109 which starts rotating at a predetermined timing between the photosensitive drum 110 rotating clockwise and the transfer charger 112. Sent to. Then, on the sheet S passing through the transfer section,
The toner image on the photosensitive drum 110 is transferred by the transfer charger 112.

Here, a toner image is formed on the photosensitive drum 110 as follows. An original (not shown) is set on the platen glass 117. The reading optical system 116 scans the document on the platen glass 117. The light image read by the reading optical system 116 is projected onto the photosensitive drum 110 rotating clockwise.
Thus, an electrostatic latent image is formed on the photosensitive drum 110, and the electrostatic latent image is developed by the toner developing device 111.

The sheet S on which the toner image has been transferred after passing through the transfer section is sent to a pair of fixing rollers 113 (113a, 113b). Then, the toner image in the unfixed state is fixed on the sheet surface by being heated and pressed while passing through the fixing nip.

The sheet S, which has passed through the fixing nip and has been subjected to the fixing process, is discharged onto a discharge tray 115 outside the apparatus by a pair of discharge rollers 114 (114a, 114b).

Next, the transport roller pair 106 for transporting the fed sheet S to the registration roller pair 109 will be described in detail.

The transport roller pair 106 includes a drive roller (rubber roller) 106a that rotates in the sheet transport direction by receiving a drive from a drive source (not shown) and a drive roller 106a.
a and a driven roller (synthetic resin roller) 106b which is driven to rotate by contact with a predetermined pressure.
6b and transport the sheet S.

In the image forming apparatus 100A, the sheet S which has been jammed while being held by the pair of conveying rollers 106 is rotated about a support shaft 108 in order to easily remove the sheet S from the image forming apparatus main body 100. A jam processing door 107 is provided which can be opened and closed. Then, the driving roller 106a of the conveying roller pair 106 is connected to the image forming apparatus main body (first
And the driven roller 106b is attached to the door (second support) 107 side.

FIG. 11 shows a state where the door 107 is closed. In this case, the driven roller (106b is in contact with the driving roller 106a at a predetermined pressure, so that the sheet S can be nipped and conveyed. FIG. 12 shows a state in which the door 107 is opened and the path is opened. In this case,
The driven roller 106b separates from the driving roller 106a,
The holding state of the sheet S is released.

FIG. 13 shows a driving roller 106a attached to the image forming apparatus main body 100 side and a driven roller 106b attached to the door 107 side. FIG. 13 shows a state where the door 107 is closed, and the driven roller 106 is closed.
b is in contact with the drive roller 106a at a predetermined pressure.

The driven roller 1 attached to the door 107
06b are bearings 118 at both end positions and the center position, respectively.
It is rotatably supported by. Each bearing 118 is urged forward by an urging spring 119.

FIG. 14 shows the structure of a driven roller support of the door 107. The door 107 has a horizontal groove 107-1.
Is formed, and a bearing 118 is attached to the groove 107-1 so as to be slidable along the groove 107-1. A biasing spring 119 is attached to the rear of the bearing 118, but the biasing spring 119 is not shown here.

As shown in FIG. 15, the driven roller 106b may be supported by the bearing 118 on the door 107 only at both ends of the driven roller 106b.

[0019]

However, in the case of the above-described conventional conveying roller pair 106, the closed door 107 and the driving roller 106a attached to the image forming apparatus main body 100 side are used.
If the driving roller 106a and the driven roller 106b are not in a parallel relationship, there is a problem that the parallel state of the driving roller 106a and the driven roller 106b cannot be obtained. This will be described in detail with reference to FIG. If the driving roller 106a and the driven roller 106b cannot be in a parallel state, the sheet S may be skewed.

FIG. 16 shows a case where the mounting accuracy of the door 107 is poor, and the closed door 107 (not shown) and the driving roller 106a mounted on the image forming apparatus main body 100 side are not in a parallel relationship. In this case, the driven roller 106b attached to the door 107
06a. This is the driven roller 106b
Is supported by a bearing 118 that can slide only in a certain direction, and the entire driven roller 106b moves only in a certain direction.

As described above, when the driven roller 106b abuts on the driving roller 106a at an angle, the driving roller 1
06a and the driven roller 106b rotate in a single contact state, causing uneven wear.
8, the driven roller 106b does not rotate smoothly, and galling occurs between the bearing 118 and the door 107, and the predetermined contact pressure by the biasing spring 119 cannot be obtained. .

The present invention has been made in view of the above circumstances, and has as its object to provide a sheet conveying apparatus in which a driving roller and a driven roller of a pair of conveying rollers abut in a parallel state. .

[0023]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a driving roller attached to a first support and a driven roller attached to a second support. The present invention relates to a sheet transporting apparatus including a transport roller pair in which when the second support moves to a predetermined position, the driven roller comes into contact with the drive roller at a predetermined pressure to hold and transport a sheet.

In order to achieve the above object, the present invention provides a plurality of rollers attached to the second support so as to be rotatable around a support shaft and independent of each other. The driven roller is supported by a support member.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 is a sectional view showing the overall structure of an image forming apparatus (electrophotographic copying machine) to which the present invention is applied. Other configurations except for a part of the configuration of the image forming apparatus 100B are the same as those of the image forming apparatus 100 of the related art.
Exactly the same as A. Therefore, here, the same members as those of the image forming apparatus 100A are denoted by the same reference numerals, and only the configuration of a portion different from the image forming apparatus 100A will be described.

The image forming apparatus 100B differs from the image forming apparatus 100A in that the driven roller 106b of the transport roller pair 106 is attached to the door 107. This configuration is shown in FIGS. FIG. 2 shows a state where the door 107 is closed, and FIG. 3 shows a state where the door 107 is opened.

The driven roller 106b is an arm-shaped roller holder (roller support member) 120 made of a synthetic resin and attached to the door 107 so as to be rotatable up and down around a boss (support shaft) 120-1. Is mounted rotatably at the tip (free end) of the. Two independent roller holders 120, 120 are attached to the door 107 at predetermined intervals, and the driven roller 106b
Both ends are supported by two roller holders 120, 120. FIG. 4 shows the driven roller 106b supported by the two roller holders 120,120. The driven roller 106b is fitted in the hole 120-4.

Roller holder 1 attached to door 107
20 is urged forward by an urging spring 125 (see FIGS. 4 and 5) interposed between the roller holder 120 and the door 107. The urging spring 125 is a roller holder 120
Is attached to the spring attachment portion 120-3. Also,
The roller holder 120 moves in the groove 107-6 of the door 107 and locks to the door 107 by stopper claws 120-2 and 120-2.
The forward movement amount is regulated by 0-2. FIG.
Are stopper claws 120-2 and 120 of the roller holder 120.
-2 shows a state where it is locked to the door 107. At this time, the roller holder 120 is
2, 107-3 (see FIGS. 6 and 7), the boss 120-1 does not fall out of the hole 107-1. Spring mounting portion 120-3 of roller holder 120
Is held between guides 107-4 and 107-5.

In the state shown in FIG. 3, the driven roller 106b is released from the pressing force of the driving roller 106a. Accordingly, the respective roller holders 120, 120 are urged by the extending urging springs 125, and the stopper claws 120-2, 1 are pressed.
20-2 has moved forward until it is locked to the door 107.

When the door 107 in the state of FIG. 3 is closed, the driven roller 106b comes into contact with the driving roller 106a and receives a pressing force from the driving roller 106a. As a result, the driven roller 106b moves backward while compressing the urging spring 125. When the door 107 is closed to the position shown in FIG.
The driven roller 106b is in contact with the drive roller 106a at a predetermined pressure by the urging force of the urging spring 125.

In the case of the present invention, both ends of the driven roller 106b are supported by independent roller holders 120,120. Therefore, for example, even when the closed door 107 and the driving roller 106a are not in a parallel relationship as shown in FIG.
6a can be contacted in parallel. In the case of FIG.
The door 107 and the drive roller 106b are not in a parallel relationship because the accuracy of attaching the drive roller 106a to the image forming apparatus main body 100 is poor.

When the door 107 is closed at the position shown in FIG. 2, the hook 123 on the side of the door 107 is
Hook receiving portion 124-1 of hook receiving member 124 on the 0 side
And the door 107 is locked. In this locked state, when the handle 122 is rotated, the hook 123 is released from the hook receiving portion 124-1 and is released.

Next, a procedure for attaching the driven roller 106b to the door 107 will be described.

First, the roller holder 120 for supporting the driven roller 106b is driven by the driven roller 1 as shown in FIG.
Attach to both ends of 06b. A biasing spring 125 is already mounted on the roller holder 120 as shown in FIG.

Next, as shown in FIGS. 6 and 7, the boss 120-1 of the roller holder 120 is
1 and rotate the roller holder 120 in the direction of arrow C. In this way, the stopper claws 120-2 and 120-2 of the roller holder 120 bend in the direction of arrow D, pass through the groove 107-6 of the door 107, and return through the groove 107-6 as shown in FIG. Then, the door 107 is locked.

As shown in FIG. 8, to remove the roller holder 120 attached to the door 107 from the door 107, the stopper claws 120-2, 120-2 are depressed in the direction of arrow D, and the roller holder 120 is moved in the direction of arrow E. Rotate in the direction. In this way, the roller holder 120 is
Of the boss 120-1 in the hole 10
7-1. This roller holder 120
Of the driven roller 106b from the door 107
Finish the removal.

As described above, the roller holder 120 (including the driven roller 106b) used in this embodiment can be easily attached to the door 107 without using a tool or the like, and can be removed from the door 107. . Therefore, parts can be easily recycled.

<Second Embodiment> FIG. 10 shows a configuration example in which one driven roller 106a abuts on three or more drive rollers 106a-1 to 106a-3.

Three or more drive rollers 106a-1 to 106a-10
When one driven roller 106b abuts on 6a-3,
It is difficult for all the driving rollers 106a-1 to 106a-3 to abut the driven roller 106b due to the variation in rubber hardness and the variation in roller diameter, and as shown in FIG. 106a-
2 may not touch. For this reason, here, the rubber hardness of the driving roller 106a-2 disposed on the inner side is reduced by the two driving rollers 106a-1 disposed on the outer side.
As shown in FIG. 10A, all the driving rollers 106a-1 to 106a-3 are brought into contact with the driven roller 106b so as to have a hardness lower than that of the driven roller 106a-3 and a large roller diameter. I have.

[0041]

As described above, according to the present invention,
A drive roller is attached to the first support side, and a driven roller is supported by a plurality of independent roller support members in a pair of transport rollers attached to the second support side. The driven roller can be brought into contact with the driving roller in a parallel state even when the driving roller is not in a parallel relationship with the second support moved to the predetermined position.

Accordingly, the sheet can be conveyed without skew, and uneven wear due to one-sided contact can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating the overall configuration of an image forming apparatus (electrophotographic copying machine) to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a configuration of an invention part. This figure shows a state in which the jam clearing door is closed.

FIG. 3 is a cross-sectional view showing a configuration of an invention part. This figure shows a state in which the jam clearing door is opened.

FIG. 4 is a perspective view showing a relationship between a driven roller and a roller holder.

FIG. 5 is a sectional view showing a configuration of a roller holder.

FIG. 6 is a perspective view showing a procedure for attaching the roller holder to the door.

FIG. 7 is a perspective view showing a procedure for attaching the roller holder to the door.

FIG. 8 is a perspective view showing a procedure for attaching the roller holder to the door.

FIG. 9 is a plan view showing a contact state of a driven roller when the closed door and the driving roller are not in a parallel relationship.

FIG. 10 is a plan view showing a configuration example when one driven roller is in contact with three or more driving rollers.

FIG. 11 is a cross-sectional view illustrating an overall configuration of a conventional image forming apparatus (electrophotographic copying machine). This figure shows a state in which the jam clearing door is closed.

FIG. 12 is a cross-sectional view illustrating the overall configuration of a conventional image forming apparatus. This figure shows a state in which the jam clearing door is opened.

FIG. 13 is a plan view illustrating a state in which a driven roller attached to a door side is correctly in contact with a driving roller attached to the image forming apparatus main body side.

FIG. 14 is a side view showing a configuration of a roller supporting portion of the door.

FIG. 15 is a perspective view showing an example in which only both ends of a driven roller are supported by bearings.

FIG. 16 is a plan view illustrating a problem of the conventional example.

[Explanation of symbols]

 100 Image Forming Apparatus Main Body (First Support) 106a Drive Roller 106b Follower Roller 107 Jam Handling Door (Second Support) 107-1 Hole 107-6 Groove 108 Door Support Shaft 120 Roller Holder (Roller Support Member) 120-1 boss (support shaft) 120-2 stopper claw 120-4 hole 125 biasing spring (roller holder biasing means)

Claims (12)

[Claims] 1. A driven roller attached to a first support and a driven roller attached to a second support, wherein the driven roller moves when the second support moves to a predetermined position. Is provided with a pair of conveying rollers that abuts the driving roller at a predetermined pressure to pinch and convey the sheet, wherein the sheet conveying device rotates about a support shaft with respect to the second support. A sheet conveying device, wherein the driven roller is supported by a plurality of roller supporting members which are attached so as to be capable of being independent of each other. 2. The sheet conveying apparatus according to claim 1, further comprising at least two roller supporting members that support both ends of the driven roller. 3. The device according to claim 1, further comprising a roller support member urging unit that urges the roller support member such that the driven roller comes into contact with the driving roller at a predetermined pressure. Sheet transport device. 4. The sheet conveying apparatus according to claim 1, wherein each of said roller supporting members also serves as a sheet guide for guiding a sheet between said driving roller and said driven roller. 5. The boss for a rotation center which is fitted in a hole provided in the second support, wherein the roller support member includes:
The sheet conveying device according to claim 1, further comprising a rotation-stopping stopper claw that is fitted into a groove provided in the second support. 6. The roller support member is rotatably held with respect to the second support in a state where the boss is fitted in the hole and the stopper claw is fitted in the groove. The sheet conveying device according to claim 5, wherein: 7. The sheet conveyance according to claim 5, wherein when the boss is fitted into the hole and the roller supporting member is rotated, the stopper claw is elastically deformed and fitted into the groove. apparatus. 8. The sheet conveying device according to claim 5, wherein the roller supporting member has a hole for supporting the roller. 9. The sheet conveying apparatus according to claim 1, wherein the roller supporting member has an arm shape. 10. The driving roller is a rubber roller,
When one of the driven rollers contacts three or more of the driving rollers, the hardness of a roller disposed inside of the plurality of driving rollers facing the one driven roller is disposed outside. The hardness of the two rollers is set lower than the hardness of the two rollers, and the diameter of the roller arranged inside is made larger than the diameter of the two rollers arranged outside. The sheet conveying device as described in the above. 11. The first support is a sheet processing apparatus main body, and the second support is attached to the sheet processing apparatus main body so as to be rotatable up and down around a support shaft. The sheet conveying device according to claim 1, wherein the opening / closing door is an open door. 12. A sheet processing apparatus for performing a predetermined process on a fed sheet, comprising a sheet conveying apparatus according to claim 1 as means for conveying the fed sheet. And a sheet processing apparatus.