JPH09278215A - Paper feeding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of forgetting to return a reverse roller pressure releasing mechanism by making a switch between pressurizing and releasing with the pressure releasing mechanism of a paper feeding device corresponding to the position of a guiding member. SOLUTION: When both guiding members 14 and 15 are opened by more than a paper passing range, an engaging pin 27 provided in a rack 16 is engaged with a notch in one end of a releasing arm 21, the other end of the releasing arm 21 is disengaged from the releasing arm 21, and the pressure of a reverse roller 3 is released. Conversely, when the guiding members 14 and 15 are returned within the paper passing range, the engaging pin 27 is disengaged, the releasing arm 21 is rotated to the position of a stop piston 28 by the action of a releasing arm spring 26, the tapered part of the tip of the releasing arm 21 raises the releasing lever 20 so as to raise a follower shaft 9 by the action of a pressure spring 8 and the reverse roller 3 is pressurized. Thus, since the releasing lever 20 is raised by the releasing arm 21 by returning the guiding members 14 and 15 within the paper passing range after jamming is eliminated, switching of the pressure releasing mechanism is not forgotten.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for a device having a paper feeding mechanism such as a copying machine and a printer, and more particularly to a paper feeding device having a reverse roller pressure releasing mechanism applicable to a manual paper feeding device. Regarding paper equipment.

[0002]

2. Description of the Related Art Recently, in a manual sheet feeding device such as a copying machine,
The return separation method (FRR) that allows multiple sheets to be passed has been increasingly adopted. However, due to the fact that it is an auxiliary unit called the manual feed unit and the cost reduction request, the mechanism for automatically releasing the reverse roller with a solenoid or the like when the paper is jammed is often omitted, and the reverse roller is always under pressure. There are many devices.

In these devices, when the user removes the jammed paper, it is necessary to pull out the paper against the reverse roller pressure, more power is required for the jam processing, and the paper is torn by a thin paper or the like. There is also a problem that the remaining paper remains in the roller nip portion.

On the other hand, there is also a system in which the reverse roller pressure is mechanically released by a release lever or the like. In this case, however, if the release lever is forgotten to be returned after the jam processing, it may cause a jam again. You must always keep in mind.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a reverse roller pressure releasing mechanism and to provide a paper feeding device in which there is no fear of forgetting to return the releasing mechanism. There is.

[0006]

In order to achieve the above object, the present invention provides a tray for storing sheets, a guide member for regulating the position of the sheet in the width direction, and a feed roller rotatably driven at a predetermined timing. And a reverse roller that presses against the feed roller and separates the sheet sent out by the feed roller with a predetermined torque, and a pressure release mechanism for the reverse roller, wherein the pressure release mechanism includes the guide member. The feature is that switching between pressurization and release is performed according to the position of.

Alternatively, the guide member may be configured so that the pressure of the reverse roller is released when the guide member is out of the paper passage range and is pressed against the feed roller when the guide member is in the paper passage range. desirable.

The tray is a manual feed table, and the manual feed table is hinged to an apparatus body such as a copying machine.
The pressure release mechanism may be stored in the side wall of the apparatus when not in use, and the pressure release mechanism may be configured to release the pressure of the reverse roller regardless of the position of the guide member when the manual feed table is stored.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an outline of the paper feeding device of the present invention applied to a manual paper feeding device. The sheet feeding mechanism according to the present invention is arranged such that a solenoid (not shown) brings a sheet into and out of contact with a manual feed table at a predetermined operation timing, and a pickup roller 1 for feeding a sheet, and a plurality of sheets fed by the pickup roller to an apparatus body such as a copying machine. It is configured by a return separation system (FRR) including a feed roller 2 for conveying and a reverse roller 3 which is in pressure contact with the feed roller and separates sheets one by one with a predetermined torque.

More specifically, it is a lever type FRR mechanism, and a drive rotatably supported by a bracket 5 fixed to a sheet feeding side plate and a unit stay 4 (the upper surface is a guide plate) via a bearing 6. The shaft 7 and the paper feed side plate side are supported in the same manner as the drive shaft 7, and the other end is composed of a driven shaft 9 supported by a bearing 8 slidably in the pressing direction. It is drivingly connected by the connecting gear 10 at a predetermined position determined by the set value. The driven shaft 9 is constantly pressed from the lower surface of the bearing 8 in the direction of the feed roller 2 by the pressure spring 11, and the end of the torque limiter 1 is pressed.
2 and the reverse roller 3 are provided.

On the other hand, a pair of guide members 14 and 15 on the basis of the center is connected to racks 16 and 17 and a pinion gear 18 on the manual feed table 13 as a tray so as to regulate the widthwise position of the paper. Further, this manual feed table is configured to be freely rotatable with respect to the apparatus main body by a hinge 19 provided at one end, and as will be described later, is configured to be accommodated in the side wall portion of the copying machine main body.

Reference numeral 20 is a release lever, and 21 is a release arm. The release lever 20 is rotatably supported on the shaft of the drive shaft 7, one end of which is projected from the unit stay 4 to the manual feed table 13 side, and is inserted into a notch 22 provided on the front surface of the manual feed table.

A release spring 23 is provided on the upper surface of the release lever 20 between the release lever 20 and the inner surface of the upper surface of the unit stay 4. This spring is set to have a stronger force than the pressure spring 11, and the release lever 20 has a lower surface. The stopper surface 24 of the cutout portion provided on the front surface of the unit stay 4
The driven shaft 9 is constantly pushed down to the position where the driven shaft 9 comes into contact with.

On the other hand, the release arm 21 is provided on the manual feed table 1
3 is rotatably supported inside a fulcrum 25 and is pulled in one direction by a release arm spring 26.

FIG. 2A shows a state where the reverse roller 3 is pressed, and FIG. 2B shows a state where the pressure of the reverse roller 3 is released. That is, in FIG. 1, when both guide members 14 and 15 are opened beyond the paper-passing range, the engagement pin 27 provided on the rack 16 engages with the notch at one end of the release arm 21. As shown in FIG. 5, the other end of the release arm 21 is released from the release lever 20, and the pressure of the reverse roller 3 is released by the configuration of the release lever 20 described above.

On the contrary, when the guide members 14 and 15 return to the paper-passable range, the engagement pin 27 is disengaged, and the release arm 21 is acted on by the release arm spring 26 to stop pin 28.
By rotating to the position and pushing up the release lever by the taper portion at the tip of the release arm 21, the driven shaft 9 is pushed up by the action of the pressure spring 8, and the reverse roller 3 is pressurized.

In FIG. 3, a releasing arm 21 shown by a solid line.
The guide members 14 and 15 are shown in a state in which the guide members 14 and 15 are opened to the outside of the paper-passable range. When the user performs jam processing, when the guide members 14 and 15 are opened in this way, the release arm 21 is disengaged from the release lever 20 and the pressure of the reverse roller 3 is released. Then pull the jammed paper and the paper can be easily removed.

After the jam is processed in this way, the guide members 14 and 15 are returned to the positions shown by the alternate long and short dash line in FIG. Then, the release arm 21 disengages from the engagement pin 27 and is pulled by the release arm spring 26 to move to the position shown by the alternate long and short dash line. The release arm 21 pushes up the release lever 20, and the reverse roller 3 presses the feed roller 2. To be done.

In FIG. 4, the manual feed table 13 has a hinge 19.
6 is a view showing a state in which the reverse lever is removed from the release arm 21 regardless of the positions of the guide members 14 and 15 in the stored state (vertical position). The pressure of 3 is released (Fig. 2
(Same as (b)), which contributes to reduction of the device load.

[0020]

As described above, according to the present invention, since the pressure releasing mechanism of the reverse roller is interlocked with the position of the guide member for regulating the sheet position, the operator can set the guide position when setting the sheet. By moving within the range where paper can pass,
Since the release mechanism is reliably switched and pressure is applied to the reverse roller, there is no forgetting to switch the pressure release mechanism, and operation mistakes do not occur. Further, when a paper jam occurs, the operation of expanding the guide member to remove the jammed paper and the pressure releasing operation are directly connected, so the operability is good.

When the manual feed table is stored, the pressure on the reverse roller is released, so that the load on the entire apparatus can be reduced and power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a paper feeding device of the present invention.

FIG. 2A is a state in which the guide member is within the sheet passing range and the reverse roller is pressed against the feed roller, and FIG. 2B is a diagram in which the guide member is outside the sheet passing range and the reverse roller is shown. It is a figure showing the state where the pressure of was released.

FIG. 3 is a top view showing a mutual relationship among a release lever, a release arm, and a guide member.

FIG. 4 is a side view showing a configuration in which the tray is a manual feed table and can be stored in the main body.

[Explanation of symbols]

 2 Feed roller 3 Reverse roller 13 Tray (manual table) 14, 15 Guide member 19 Hinge

Claims (3)

[Claims] 1. A tray for accommodating sheets, a guide member for regulating the position of the sheet in the width direction, a feed roller which is rotationally driven at a predetermined timing, and a plurality of sheets which are pressed against the feed roller and fed out by the feed roller. In a sheet feeding device having a reverse roller for separating the sheet with a predetermined torque and a pressure releasing mechanism for the reverse roller, the pressure releasing mechanism corresponds to the position of the guide member,
A paper feeding device characterized by switching between pressurization and release. 2. The guide member is configured so that the pressure of the reverse roller is released when the guide member is out of the paper-passable range, and is pressed against the feed roller when it is in the paper-passable range. The sheet feeding device according to claim 1, wherein 3. The tray is a manual feed table, the manual feed table is hinged to a main body of an apparatus such as a copying machine, and can be stored in the side wall of the apparatus when not in use, and the pressure release mechanism stores the manual feed table. 3. The paper feeding device according to claim 1, wherein the pressure of the reverse roller is released regardless of the position of the guide member when the paper feeds.