JPH10250872A - Sheet carrier device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts, to save a space and to improve operability. SOLUTION: This sheet carrier device is constituted by arranging a plural number of driving rollers 10, 11 connected to each other and a plural number of driven rollers 12, 13 connected to each other in the carrying direction of a sheet 18 and providing a knob 23 an outside diameter of which is specified smaller than an outside diameter of the driving roller 11 and a part of an outer periphery of which is projected on a sheet carrier passage 1 coaxially with the driving roller 11 facing against the driven roller 13 supported free to advance and retreat and selectively separated. Consequently, at the time of jam treatment, an outer periphery of the knob 23 is opened by separating the driven roller 13 from the driving roller 11 and the sheet 18 is delivered to a desired position by rotating the driving rollers 10, 11 by rotating the knob 23. Additionally, the knob 23 is supported without increasing a space and the number of parts by supporting the knob 23 coaxially with the driving roller 11 within width of the sheet 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying device used for a copying machine, a facsimile, a printer, a printing machine and the like.

[0002]

2. Description of the Related Art Generally, in a sheet conveying apparatus for conveying a sheet by a pair of a driving roller and a driven roller, a plurality of driving rollers and driven rollers are provided according to the path and length of a sheet conveying path. .

[0003] In such a sheet conveying apparatus, the sheet conveying path is opened for jam clearance. However, due to the arrangement of components, the sheet conveying path is not fully opened. Often. Therefore, a plurality of driving rollers are connected by a belt or the like, a knob is connected to a specific driving roller, and when a jam occurs, the driving roller in the sheet conveying path is rotated by rotating the knob, and the sheet is moved to a desired position in the sheet conveying path. (The position where it is easy to take out). Examples of such a configuration include those described in Japanese Utility Model Application Laid-Open No. 59-91240, Japanese Utility Model Application Laid-Open No. 3-44144, and Japanese Utility Model Application Laid-Open No. 4-22439. These knobs are usually covered by an outer cover.

[0004]

In the conventional structure having a knob as described above, at the time of jam clearance, at least a part of the sheet conveying path is opened, and further, the outer cover is opened to grip the knob. Since a double opening operation is required, the operation becomes complicated. Further, since the knob is arranged outside the sheet conveying path, an independent space corresponding to the knob is required. In particular, 3-44144
In the example of the publication, the shaft of the transport roller and the shaft to which the knob is attached are arranged orthogonally, and the bevel gear meshing with both shafts is fixedly fitted to each other. , A shaft to which the knob is connected, a support member for supporting the shaft, and the like are required, so that there is a problem that a space for mounting parts increases and the number of parts increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a sheet conveying apparatus capable of reducing the number of parts, saving space, and improving operability.

[0006]

According to a first aspect of the present invention, there is provided a sheet conveying apparatus, wherein a plurality of driving rollers having a part of an outer periphery projecting to a sheet conveying path are connected to each other and arranged in the sheet conveying direction. A plurality of driven rollers including at least one driven roller constantly pressed against the driving roller and at least one driven roller supported so as to be able to move forward and backward and selectively separated from the driving roller are provided. A knob is provided which has the outer diameter smaller than the diameter, a part of the outer periphery of which is projected into the sheet conveying path, and which coaxially rotates the driving roller facing the driven roller which is supported to move forward and backward.

Therefore, when the driving roller is driven by the motor with all the driven rollers in contact with the driving roller, the sheet is conveyed. At this time, the knob having a small outer diameter does not apply a conveying force or a braking force to the sheet. At the time of jam clearance, when the driven roller is separated from the driving roller, a part of the sheet conveying path is opened. By manually turning a knob in this open space, all the driving rollers can be rotated.

According to a second aspect of the present invention, the knob is fixed to the shaft of the driving roller. Therefore, it is possible to transmit the rotation of the knob to the drive roller with a simple structure.

According to a third aspect of the present invention, in the sheet transporting apparatus according to the first aspect, the knob and the driving roller are arranged such that only the rotational force in the forward direction of the knob corresponding to the sheet transport direction is applied to the driving roller. It is connected via a one-way clutch for transmission. Therefore, at the time of jam clearance, the drive roller rotates only when the knob is rotated in the forward direction, and the sheet is conveyed only in the forward direction.

[0010]

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a sheet conveyance path provided substantially vertically. The sheet conveying path 1 includes an upper fixed guide plate 2, a lower fixed guide plate 3 disposed below the upper fixed guide plate 2, an upper guide member 4 fixedly provided on the upper back surface of the lower fixed guide plate 3, Lower fixed guide plate 3
, A lower guide member 5 disposed below the upper fixed guide plate 2, an upper guide wall 6 opposed to the upper portions of the lower fixed guide plate 3 with a predetermined gap therebetween, and a lower fixed guide plate 3. The lower guide wall 5 is formed opposite to the lower and lower guide members 5 with a predetermined gap therebetween.

The upper fixed guide plate 2 and the lower fixed guide plate 3 are curved such that the lower portions are separated from the guide walls 6 and 7. An upper paper feed passage 8 is formed between the lower portion of the upper fixed guide plate 2 and the upper surface of the upper guide member 4, and the lower paper feed passage is formed between the lower portion of the lower fixed guide plate 3 and the upper surface of the lower guide member 5. A passage 9 is formed. Driving rollers 10, 11 whose outer circumferences partially protrude from the sheet conveying path 1 are connected to each other by a belt (not shown) and rotatably supported above the sheet feeding paths 8, 9. . One of these drive rollers 10, 11 is connected to a motor (not shown). The upper guide wall 6 and the lower guide wall 7 have driven rollers 12 and 13 respectively.
Are urged toward the drive rollers 10 and 11 and are rotatably supported. As shown in FIG. 2, the lower guide member 5 and the lower guide wall 7 are supported rotatably about fulcrum shafts 14 and 15.

Further, an upper paper feed passage 8 and a lower paper feed passage 9 are provided.
A separation roller 19, which prevents double feeding of the sheet 18 fed by the sheet feeding rollers 16 and 17, respectively,
20 are provided. The sheets 18 are supported in a stacked state on a sheet feed tray (not shown). These paper feed trays are detachably supported inside the image forming apparatus main body 21 shown in FIG.

An opening 2 is provided on a side surface of the image forming apparatus main body 21.
2 are formed. Here, the aforementioned lower guide wall 7
Functions as a door that opens and closes the opening 22. The upper guide wall 6 is formed using the wall surface of the image forming apparatus main body 21.

A one-way clutch (not shown) is provided on a roller shaft 11a, which is a shaft that rotates integrally with the driving roller 11, so that the knob 23 is positioned within the width of the sheet 18.
Are fitted through. That is, the driving rollers 10,
11 is driven counterclockwise by a motor (forward direction corresponding to the sheet conveying direction) to convey the sheet 18 upward, but when the motor is stopped, the knob 23 is manually turned counterclockwise (forward direction). When the drive roller 11 rotates counterclockwise and the knob 23 is rotated clockwise, only the knob 23 idles, and the rotational force of the knob 23 is not transmitted to the drive roller 11. The knob 23 and the drive roller 11 are connected to the window 2 formed in the lower fixed guide plate 3.
A part of the outer periphery is projected from 4. The outer diameter of the knob 23 is determined to be smaller than the outer diameter of the drive rollers 10 and 11.

In such a configuration, when feeding a sheet, the sheet 18 stacked on the upper or lower sheet feeding tray is fed by the sheet feeding rollers 16 or 17 by selecting the sheet feeding tray. This sheet 18 is used as the separation roller 1
9 or 20, the sheet conveying path 1 from the sheet feeding path 8 or 9
It is led to. When the lower sheet feed tray is selected, the sheet 18 is conveyed upward by the driving roller 11 and the driven roller 13, further conveyed by the driving roller 10 and the driven roller 12, and is fed to a desired image forming unit (not shown). Is fed to the part. If you select the upper tray,
The sheet 18 is transported upward by the driving roller 10 and the driven roller 12. Further, when the image forming apparatus main body 21 is placed on the upper part of the main body (not shown) of the large-sized paper feeding device, the sheets in the large-sized paper feeding device can be fed. In this case, the sheet fed from the large sheet feeding device is fed from the lower end of the sheet conveying path 1. in this case,
The knob 23 has a part of the outer periphery within the width of the seat 18 and the window 2.
4, the sheet 18 does not apply a conveying force or a braking force to the sheet 18 because its outer diameter is smaller than the drive rollers 10 and 11. That is, the seat 18 is
Transported without being affected by

When the sheet 18 thus fed is jammed in the sheet conveying path 1, a jam sensor (not shown) detects the jam and the motor for driving the drive rollers 10, 11 stops. In this case, as shown in FIGS. 2 and 3, the lower guide member 5 and the lower guide wall 7 are pivoted about the fulcrum shafts 14 and 15 to the outside of the image forming apparatus main body 21, so that the sheet conveying path is rotated. The lower part of 1 is opened. In this state, a large space is formed in the lower front surface of the lower fixed guide plate 3, so that the knob 23 can be manually turned.

When a jam occurs in the lower part of the sheet conveying path 1, the sheet 18 can be pulled out by hand.
If a jam occurs in the upper part of the sheet conveying path 1, the knob 23 is turned counterclockwise. The rotational force is transmitted to the drive roller 11 via a one-way clutch and a roller shaft 11a, and the rotation of the drive roller 11 is transmitted to the upper drive roller 10 via a belt.
Is transported to a position where it can be easily taken out in the sheet transport path 1,
You can take it out there.

As described above, only by rotating the lower guide wall 7 supporting the driven roller 13 outwardly, the lower portion of the sheet conveying path 1 is opened and a space for operating the knob 23 can be secured. Processing is easy.

Since the knob 23 is supported by the shaft 11a of the driving roller 11 within the width of the sheet 18, the knob 23 can be arranged using a dead space where the driving roller 11 is not arranged. . Thus, there is no need to separately secure a space for disposing the knob 23. Further, the knob 23 is supported by the shaft 11a of the drive roller 11, and an exterior cover or the like that normally hides the knob 23 is not required, so that the number of parts can be reduced.

As described above, the knob 23 is turned counterclockwise (forward) to rotate the drive rollers 10, 11 counterclockwise, and the sheet 18 is conveyed to the desired position in the forward direction and taken out. When the sheet 18 is returned in the reverse direction during the jam processing, the sheet 18 may be caught near the confluence of the sheet feeding passages 8 and 9. However, in this embodiment, when the knob 23 is turned clockwise (reverse direction), only the knob 23 idles and the drive rollers 10 and 11 do not rotate. No failure occurs.

As described above, the knob 23 and the driving roller 11 are connected via the one-way clutch. However, the knob 23 may be fixedly provided on the roller shaft 11a of the driving roller 11. In this case, by integrally forming the knob 23 with the roller shaft 11a, the number of parts can be significantly reduced. Of course, the knob 23 formed as a separate member may be fixedly fitted to the roller shaft 11a. In this case as well, the knob 23 formed as a separate member is connected to the roller shaft 11a.
Into the roller shaft 11a and the knob 23, for example.
A fitting portion having a cross-sectional shape other than a circle such as a letter is formed to fit the two, or a roller shaft 11a and a knob 2 fitted to the roller shaft 11a.
The rotation of the knob 23 can be transmitted to the drive roller 11 with a simple structure such as pressing a spring pin into the drive roller 11.

In this embodiment, the case of the sheet conveying path 1 having a vertical direction has been described as an example. However, the present invention is applicable regardless of the direction of the sheet conveying path.

[0023]

According to the first aspect of the present invention, a plurality of drive rollers having a part of the outer periphery projecting from the sheet transport path are connected to each other and arranged in the sheet transport direction, and are always connected to the drive rollers. At least one driven roller pressed,
A plurality of driven rollers including at least one driven roller which is supported so as to be able to move forward and backward and is selectively separated from the driving roller, and has a smaller outer diameter than the outer diameter of the driving roller and a part of the outer periphery Since a knob is provided that protrudes into the sheet conveying path and coaxially rotates the drive roller facing the driven roller supported to be able to move forward and backward,
At the time of jam clearance, when the driven roller is separated from the driving roller, a part of the sheet conveying path is opened, and all the driving rollers are rotated by manually turning a knob in this open space, and the sheet is fed to a desired position. Can be taken out. Further, since the knob can be supported coaxially with the driving roller within the width of the sheet, the knob can be arranged using a dead space where the driving roller is not arranged. Furthermore, since the knob is supported coaxially with the drive roller in opposition to the sheet conveyance path, a support member for supporting the knob and an exterior cover for normally hiding the knob are not required, so that the number of parts is reduced. be able to.

According to the second aspect of the present invention, since the knob is fixedly provided on the shaft of the driving roller, the rotation of the knob can be transmitted to the driving roller with a simple structure.

According to the third aspect of the present invention, the knob and the drive roller are connected via the one-way clutch which transmits only the forward rotational force of the knob corresponding to the sheet conveying direction to the drive roller. Only when the knob was rotated in the forward direction during the jam processing, the drive roller was rotated in the forward direction, the sheet was conveyed only in the forward direction, and the sheet could be taken out at a desired position, and the knob was turned in the reverse direction. At this time, only the knob idles and the drive roller does not rotate, so that the operation of returning the jammed sheet in the reverse direction can be prohibited.
Accordingly, it is possible to prevent a situation in which the returned sheet is caught in the sheet conveyance path.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a state where a sheet conveying path is opened.

FIG. 3 is a perspective view showing a state where a sheet conveying path is opened.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet conveyance path 10, 11 Drive roller 11a Shaft 12, 13 Follower roller 18 Sheet 23 Knob

Claims (3)

[Claims] 1. A sheet conveying path for guiding a sheet, a plurality of driving rollers projecting part of the outer periphery from the sheet conveying path and arranged along the sheet conveying direction and connected to each other; A plurality of driven rollers including at least one driven roller constantly pressed against the roller, and at least one driven roller supported so as to be able to move forward and backward and selectively separated from the driving roller; A knob that is coaxially rotated with the driven roller facing the driven roller supported so as to be able to move forward and backward, wherein a part of the outer periphery is also set to a small outer diameter and protrudes into the sheet conveying path. Characteristic sheet conveying device. 2. The sheet conveying apparatus according to claim 1, wherein the knob is fixedly provided on a shaft of the driving roller. 3. The knob and the drive roller are connected via a one-way clutch that transmits only a forward rotation force of the knob corresponding to a sheet conveying direction to the drive roller. 2. The sheet conveying device according to 1.