JPS60244736A - Paper feeder - Google Patents

Abstract

PURPOSE:To smoothly take out jammed paper, by using a cam means provided on a turning shaft for an opening member, to put an intermediate conveying mechanism out of conveying operation when a jammed recording paper takeout means is opended. CONSTITUTION:When a conveyance trouble has happened due to the jamming or the like of recording paper, a handle 42b is turned clockwise to rotate a lower guide plate 42 clockwise against the urging force of an elastic member to open a recording paper conveyance passage. At the same time, a bearing 28 is pushed by a cam member 44 secured to a side wall 42a to move the driven roller 26 of an intermediate conveying mechanism along the slender holes 31a of support plates 31 to separate the driven roller from a driving roller 21. As a result, the jammed and deformed recording paper can be easily and quickly taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device provided between an image forming section and a paper feeding section in a copying machine.

[Prior art]

In electrophotographic copying machines that are generally used for office work, recording paper is most commonly supplied by a paper feed cassette, so a paper feed cassette F installed inside the copy machine body is used.
is mounted as close as possible to the image forming section, thereby minimizing the conveyance distance of the recording paper and contributing to the amplification of the copy speed and the prevention of jams.

Therefore, when the recording paper is carried out from the paper cassette 7 by the conveyance roller, it is conveyed directly to the registration rollers, where the toner image on the photoreceptor drum, timing, and speed are adjusted, and then fed to the transfer area. It looks like this.

However, if a multi-sheet feed unit is also installed in such a copying machine, the paper feed unit will have to be placed at the bottom of the paper feed cassette group mentioned above, so the multi-sheet feed unit will not be installed. On the other hand, the delivery roller provided must be located at a location remote from the above-described roller.

Therefore, in addition to the above-mentioned carry-out roller, it is necessary to newly provide an intermediate conveyance member approximately in the middle of the registration roller on the conveyance path of the recording paper carried out from the multi-sheet feed unit.

FIG. 1 shows the configuration of such an intermediate conveyance member in a cross section viewed from the side. When the multi-sheet feeding unit 1 is attached and fixed to the copying machine main body 10 shown by the dashed-dotted line, The stacked recording sheets P, whose positions are regulated by the front abutment plate 2, rear abutment plate, and left and right side plates (none of which are shown) in the multi-sheet feed unit 1, are pushed up by the push-up plate 3. The structure is such that the uppermost recording paper P is pressed against a carry-out roller 11 positioned above the recording paper P.

When the drive source of the multi-sheet feeding unit 1 is activated due to the start of copying, the drive rollers of the delivery loaf 11, the sorting belt 12, and the intermediate conveyance member 13] and 3a all rotate clockwise, and the multi-sheet feeding unit is activated. A structure in which the uppermost recording paper P in one sheet is carried out one by one, conveyed to a side plate 15 in the copying machine main body 10 via an intermediate guide member 14, and further fed in the direction of a registration roller (not shown). It becomes.

That is, the intermediate conveyance member 13 and the intermediate guide member 1
4 plays the role of relaying and conveying the recording paper, which is shorter in length than the conveyor 11i, and feeding it to the image forming section.

The structure of the intermediate conveyance member 13 and the intermediate side member 14 is that the drive roller is located in the second part of the conveyance path.
, 3a and the intermediate guide plate 14a are fixedly provided with respect to the multi-sheet feeding unit 1, but a driven roller 131] and an intermediate guide 141] disposed at the lower part of the conveyance path for the purpose of paper processing. It is designed to have the ability to move and evacuate quickly. That is, the driven roller 1
31+ is an intermediate guide plate mounted on a shaft 16 and rotatably attached to the multi-sheet feeding unit 1], and is rotatably supported on the monthly analysis portions 14c provided on the left and right sides of 4b. and the tension spring 17 of the intermediate guide plate 1411
Due to the biasing force 1 in the counterclockwise direction, the drive roller 1
3a, and in this state, the intermediate guide plate 14b is configured to form a slit for conveying the recording paper P between it and the intermediate guide plate +4a.
When the /b (indicated by a dashed line) 18 provided on the front side of the page 1 is pushed down, the intermediate guide plate 1411 opens wide clockwise around the shaft 16, and at the same time the driven roller 131 also opens. The structure is such that it can be moved from the pressure contact position and separated from the drive roller i3a, making it easy to remove the recording paper in a no-yam state.

However, since the side surface of the intermediate guide member 14 in the direction toward the front in the drawing needs to be wide open for taking out the recording paper, etc., it is not possible to cover the entire surface with the substrate. Therefore, the tension spring 17 is located at the back 1111 of the multi-sheet feeding unit 1.
Since it can be attached only to the + side, the pressing force against the driven roller 13bfl and the driving roller 13a tends to be unbalanced.

In addition, the parallelism of the axes of the driven roller 13b and the driving roller 13a is determined by the mounting error of the shaft 16 and the intermediate guide plate]
It is difficult to maintain high accuracy due to the mounting error of the driven roller L3b in 4b, and it is difficult to stably transport the recording paper in an accurate direction depending on the intermediate transport member 13 having such a configuration. has been done.

[Purpose of the invention]

The present invention is provided with an intermediate conveyance member consisting of rollers having good parallelism and a balanced pressure contact force distribution, and simultaneously opens the directions of the intermediate conveyance member and the middle guide member working together with the intermediate conveyance member with one manual operation. The purpose of this invention is to provide a paper feeding device for a copying machine that can perform the following functions.

[Structure of the invention]

In the present invention, a pair of driving and driven rollers in the intermediate conveying member are brought into pressure contact with a spring belt wound around both shaft ends of the rollers, so that the recording paper can be conveyed, while supporting the shaft ends of the drive roller. A rotatable intermediate guide member is provided as a shaft, and the intermediate guide member is manually rotated to open the recording paper conveyance path, and at the same time, a cam member provided at a rotation base of the intermediate guide member presses the driven roller. This device is configured to separate from the drive roller against the biasing force of the recording paper, and has an intermediate conveyance member in the conveyance path that conveys the recording paper from the paper feeding unit to the image recording unit, and has a mechanism for removing jammed recording paper. In the paper feeding device, the conveying action of the intermediate conveying member is released by a cam means provided on a rotating shaft of the opening member when the jammed recording paper removing means is opened. This is accomplished by a paper feeder.

〔Example〕

One embodiment of the paper feeding device according to the present invention is shown in FIGS. 2 to 4.

For convenience, Figure ptS2 shows the arrangement and configuration of the intermediate conveyance member, that is, the drive roller 21 and the driven roller 26, the intermediate guide member, that is, the upper guide plate 41, and the lower guide plate 42, which is especially called an opening member in the paper feeding device. It is shown with the substrate supporting them removed.

As shown in FIG. 3, the driving roller 21 and the driven roller 26 have both shaft end portions 22 and 27 supported by a pair of left and right substrates 31 via bearings 23 and 28, but the driving roller 21 is position, the driven roller 26 is in contact with the substrate 31
The driving roller 21 and the driven roller 26 can be moved slightly in the direction of the driving roller 221 within the elongated hole 31a provided in the hole 31a, and the driving roller 21 and the driven roller 26 are pressed uniformly over their entire length by a spring belt 32. has been done.

The drive row 221 is connected to a drive source (not shown), and has the function of pinching and conveying the recording paper together with the driven roller 26.

Further, left and right side wall portions 42a integrally bent from the lower guide plate 42 are rotatably fitted to the bearing 23 of the drive roller 21, and are attached counterclockwise by an elastic member (not shown). Although the lower guide plate 42 is
The distal end of the guide bar J1-43 is fixedly attached to the main body of the copying machine and held in the state shown in the figure.

Further, fIS2. Cam members 44 are fixed as cam means at the positions shown in FIG. 4, and a portion of the side wall portion 42a on the near side in the figure is extended to form a handle 42b serving as Noyam recording paper ejecting means. There is.

When the recording paper is carried out from the above-mentioned multi-sheet feeding unit F in the illustrated state, the recording paper follows the conveyance path formed by the intermediate guide member, that is, the upper guide plate 41 and the lower side guide plate 42. The sheet is sandwiched and conveyed by the intermediate conveying member, that is, the driving roller 21 and the driven roller 26, which are already rotated by the drive source in the multi-sheet feeding unit 1, and is fed to the image forming section.

If a transportation accident occurs due to recording paper jamming or the like in this paper feeder, when the handle 42b is rotated clockwise, the lower guide plate 42 integrated with the handle 42b will also The cam member 44 fixed to the side wall 42 a presses the bearing 28 to move the driven roller 26 toward the substrate 31 by rotating clockwise against the bias of the member to open the recording paper conveyance path. The driven roller 26 is moved along the elongated hole 31a to be separated from the driving roller 21.

Therefore, it is possible to easily and quickly take out the recording paper that has become distorted and deformed, and even after processing, the handle 42 b
By simply restoring the function, the function of guiding and conveying the recording paper can be immediately restored.

If necessary, it is also easy to lock the handle 42b in the rotated position so that the opening of the lower guide plate 42 and the separation of the driven roller 26 can be maintained for a certain period of time.

As is clear from the above explanation, in the paper feeding device of the present invention, the movement of the driven roller 26 is obtained by the rotation angle of the cam member 44 with the drive roller 21 as a fulcrum. 21 can be limited to the necessary minimum, that is, the minimum interval necessary to take out the recording paper, and as a result, the spring belt 32 can be used and the recording paper conveyance function by the intermediate conveyance member can be improved as described above. ”.

〔Effect of the invention〕

According to the present invention, the function of the intermediate conveying member that relays and conveys recording paper through the main body of the copying machine is improved, and as a result, the accuracy of the paper feeding device added to the copying plate is also improved. This enabled a stable supply of recording paper. Particularly, in the present invention, since the plurality of cam members move and release the rollers in parallel, the jammed paper can be taken out very smoothly, and the rollers are pressed against each other smoothly, so that paper feeding is stabilized.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a conventional paper feeding device. FIG. 2 is a side view of essential parts of the paper feeding device according to the present invention. @3 In the figure, go to the arrow 11.
FIG. 4 is a cross-sectional view at the anus indicated by the arrow. Zl... Drive roller 22, 27... Shaft end portion 23.28... Bearing 26... Driven roller 31... Substrate 31a... ...Elongated hole 32 ... Spring belt 41 ... Upper guide plate 42 ... Lower guide plate 43 ...
...Guide fitting 44...Cam member 45.46...
...Fixed guide plate agent Patent attorney No 1) Parent-in-law Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] In a paper feeding device that has an intermediate conveyance member in the conveyance path for conveying the recording paper from the paper feeding section to the image recording section and is equipped with a Noyam recording paper take-out means, when the jammed recording paper take-out means is opened, the release member A paper feeding device characterized in that the conveying action of the intermediate conveying member is released by a cam means provided on a rotating shaft.