JPH02163230A - Paper feeding device - Google Patents

Abstract

PURPOSE:To facilitate jamming treatment even when the moving quantity of a paper feeding unit is small by simultaneously moving a pair of center guides and one of a pair of rollers at the time of separating the guides. CONSTITUTION:When a sheet material is jammed in a pass P2, guides 10, 11 are turned in the arrow direction to enlarge a space and treat the jam. In the case of jamming in an upside pass P1, since the space is sufficiently wide, jamming treatment is carried out without turning the guide 10. Although any point will do for the fulcrum of oscillation, an oscillating quantity can be more increased when it is positioned on the end of the guide 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper feeding device, and more particularly, to a paper feeding unit configured to be mounted on the side of an image forming apparatus for feeding a large amount of paper, for example. It is something.

[Prior Art] Conventionally, paper feeding mechanisms of image forming apparatuses include cassette type,
There is a front-loading built-in type at the bottom of the main body and a front-loading lateral δ type.

When considering the operations to be performed in these devices when a paper jam occurs, they can be divided into the following types.

■For cassette/deck type If you are using a cassette, if you cannot process from the front of the main unit, remove the cassette from the main unit, insert your hand into the paper feed slot, and remove the jammed paper.

In the deck section, open the deck cover, lower the paper feed deck, and then insert your hand through the paper feed slot to process the paper.

■Front-loading built-in type at the bottom of the main unit After opening the front door of the main unit, extend the guide section to the extent that the transfer paper can be removed, and then insert your hand to process it.

■Front-loading Main unit: Horizontal type Move the feeding unit horizontally by sliding, etc., open the side plate at the front of the main unit as much as possible, and then insert your hand through there to perform processing.

[Problem to be solved by the invention] Among these cases, in the case of the above (■), the process should be considerably easier if you put your hand in the paper feed slot, or if you use this large capacity paper feed unit to form an image every time you clear a jam. It is difficult to process the material at a large distance from the device.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned drawbacks of the conventional example. 5. The guide means in the image forming apparatus is made movable (swingable) to enlarge the sheet conveyance path and prevent jams. To provide a shiso feeding device for easy processing.

[Example] A unit in which the present invention is implemented will be explained with reference to FIG.

For ease of understanding, FIG. 2 shows the slider in a state where it has already been slid for jam clearance.

In the figure, A is a lower paper feeding unit, and B is an upper paper feeding unit that is slidably supported thereon. In the lower unit, 20 is a deck that moves up and down, and m sheet materials are placed thereon. A paper path 21 guides the sheet material to the bottom opening 33 of the upper unit B. In the upper unit B, 31.32 is a deck that moves up and down, 34.35 is a pickup roller, 36.37 is a pair of separation rollers, 38.
39 is a conveyance roller, and 42, 43, 44.45 are conveyance buses. Furthermore, C is a manual feeding unit, which is arranged at the top of the upper unit B, and includes a sheet material loading section 50, a pickup roller 51, a pair of separation rollers 52, and a transparent opening/closing M5.
It has 3. 54 is a support shaft of the opening/closing lid.

Further, the paper feed unit A is provided with a guide rail 25 on the upper frame 24, and the rollers 40 on the lower surface of the paper feed unit B are guided. Paper feed unit A is caster 1
4 and is disposed on the side of the copying machine main body 15. Normally, after placement, it is locked to the main body by a locking means and fixed in position. Unit B is similarly locked to the main body and fixed in position.

Decks 20, 31, and 32 are each Accuride a l
* A 2 is slidably supported and can be pulled out in a direction perpendicular to the plane of the paper in FIG. Therefore, the door is on the front side, and by opening the door, the decks 20, 31 and 32 can be pulled out and sheet materials can be replenished. Therefore, jams in the deck can be cleared by opening the door and lowering the middle plate to lower the stacked sheet materials.

When feeding paper from the deck 20 of unit A located at the bottom of the large capacity paper feeding unit, the pickup roller 1
The transfer paper 2 is fed to a paper feed roller 3. Here, the sheets are reliably separated one by one and transported to the upper standby roller 4 and the lower standby roller 5.

Thereafter, when the size of the transfer paper in the lower stage A is selected, it is sent as is to the pair of registration rollers 6 of the copying machine main body 15, an image is formed on it, and the paper is ejected. 30 is a photosensitive drum.

Next, when the paper is fed from the deck 21 or 22 of another paper feeding unit B, it is all fed to the upper conveyance roller pair 7 and guided to the registration roller pair 6 of one main body.

If a jam occurs here, the present invention adopts the following configuration.

This is an example in which all guides are left on the main body side.

In this case, if the paper is fed from the lower deck,
No. 11 is a great hindrance to jam removal.

Therefore, a structure was adopted in which it is oscillated as shown in FIGS. 3 and 4.

That is, the guide 10 (lower guide of the upper bus P), the guide 11 (upper guide of the lower bus P2), and one roller 4 of the pair of standby rollers are integrally supported so as to be swingable. The distance of 1II1 of the bus Pt by the guide 11 is maintained by the standby roller pair 4.5 being brought into contact with each other by their own weight. The rollers 4 and 5 may be pressed by weak springs, or the rollers 4 and 5 may be pressed by strong springs and a separate pressing force release mechanism may be provided.

The standby roller 5 is a driving roller, and the roller 4 is a driven roller. The function of the pair of standby rollers 4 and 5 is to temporarily stop and wait the sheet material fed from the paper feed section, and is effective when the distance from the paper feed section to the registration roller 6 is long. The sheet material is moved to the standby roller 4 by inputting the paper feed command.
, 5, the speed can be increased.

In the above configuration, when a sheet material jams in the bus P2, the guides 10 and 11 are rotated in the arrow direction as shown in FIG. 4 to enlarge the space. In the case of the upper bus P1, the space is sufficiently wide in the state shown in FIG. 3, so it can be handled easily. This swinging fulcrum can be anywhere, but the guide lO
It may be more effective to position it at the tip of the roller (near the registration roller) because the amount of swing will increase.

This configuration has the following advantages.

■A jam in the upper paper feed section can be cleared by sliding the paper feed unit (upper) sideways and then inserting your hand from diagonally above.

(2) In the lower part, after releasing in the same way, the unit of the guide 10° 11 and the upper standby roller 4 can be swung upward to perform processing.

Naturally, since the paper does not have to be processed while being held between standby rollers, jam processing can be easily performed.

[Effects] Since the present invention has the above-described configuration, there is an effect that jam removal can be easily performed even if the amount of movement of the paper feeding unit is small.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in which a large-capacity paper feed unit is attached to the main body of an image forming apparatus; FIG. 2 is a cross-sectional view of an embodiment of the present invention in a slid state; Figure 4 is an enlarged view of the main parts of Figure 2.
It is a diagram. 4...Roller 10...Guide If...Guide

Claims (3)

[Claims] (1) In a sheet feeding device that is configured to be removable from an image forming apparatus and includes a sheet material storage means that can be pulled out and loaded with sheet material and then pushed into the device to be in a state where paper can be fed, A paper feeding device characterized in that one of a pair of center guides and a pair of rollers can be moved simultaneously when the paper feeding device is separated. (2) There are two ports for feeding paper from the large-capacity paper feed unit to the main body, one on the lower guide of the upper paper feed port, and one on the upper guide and lower paper feed port side of the lower paper feed port. 2. The paper feeding device according to claim 1, wherein the upper roller of the pair of standby rollers moves in accordance with the slide of the large capacity paper feeding unit. (3) There are two ports for feeding paper from the large-capacity paper feed unit to the main body: the lower guide of the upper paper feed port, the upper guide of the lower paper feed port, and the lower paper feed port. 2. The paper feeding device according to claim 1, wherein the upper rollers of the pair of standby rollers are configured to be rotatable at the same time.