JPS5953337A - Paper clog relieving device for a sheet feeder - Google Patents

Abstract

PURPOSE:To facilitate check or takeout of a fam plate by such a construction that a roller couple, guide plate couple, etc., which pinches the path for sheets, is released greatly when a paper clog has occurred. CONSTITUTION:When a paper clog has occurred between guide plates 11-1 and 11-2 or near a couple of transport rollers 4-1, 5 located farther, first a paper feed cassette 1-1 is taken out of the machine body and lifted in the direction as shown by arrow against the force of a spring 8-4 by holding the right end of a lift lever 8-1, so as to allow a boss 8-5 to move along the edge of a set lever 9-1, which is being pressed to said boss 8-5 by a spring 9-2, to be fitted in a notch and detained there. As a result, a unit 6-1 rotates clockwise round a shaft 7-1 to open the space between the guide plates 11-1 and 11-2, and a feed roller 3-1 will separates from a separating roller 3-2. At the same time, a projection 6-2 heaves the shaft end of the transporting upper roller 4-1 to open nibs of the transporting upper and lower rollers 4-1, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper jam removing device for a paper feeding device that feeds paper to a copying machine, printer, etc. using a paper feeding cassette.

As a paper feed device that uses a paper feed cassette that is detachable from the main body of a device such as a copying machine or printer, a paper feed device that uses a paper feed cassette that is detachable from the main body of a device such as a copying machine or a printer is used. The paper is rotated to feed out the paper in the cassette, and the paper is separated by a friction member that has a smaller coefficient of friction and is stationary or rotates in the opposite direction, and is in pressure contact with this paper feed roller or a paper feed roller that is separately provided downstream. A widely used device is one in which sheets are fed one by one through a guide plate and a pair of conveying rollers. If a paper jam occurs in the paper feed path mentioned above, it must be removed, but the paper feed roller, friction section, and conveyance roller pair press against each other, and the paper feed roller and conveyance roller exert paper feed force. Since it only rotates in the opposite direction, if you pull out the jammed paper, there is a risk of tearing the paper or damaging the device. Therefore, a paper jam release mechanism has been proposed in which a lever is used to separate the pair of rollers and the upper and lower guide plates, but in this example, the lever can be operated with a paper cassette installed. Because of this, it is difficult to completely free the jammed paper, and it often happens that the jammed paper is visible and cannot be completely removed.

Furthermore, since the paper feed cassette can be attached and detached even when the lever is in the released position, there is a risk that the cassette may be attached without fully forgetting to return the lever, resulting in a paper feed error.

This invention solves the above-mentioned drawbacks of the paper release device of the paper feeding device that uses the paper feed force adjustment mechanism that has been proposed in the past.
When a paper jam occurs, the roller pairs and guide plate pairs that sandwich the paper path are wide open, making it easy to visually check and take out the jammed paper. The objective is to provide a paper jam release device that will never be forgotten.

According to the present invention, the purpose of this invention is to provide a release position that separates one force from the other force of the paper feed roller, friction member, upper and lower guide plates, and a pair of transport rollers that are opposed to each other across the paper path, and to set them at a predetermined position. A displaceable lever is provided at the return position to return the paper feed cassette to its operating position, and the lever can only be operated when the paper feed cassette is removed from the main body of the device. This is achieved by occupying a portion of the space sometimes occupied by the paper feed cassette, and by means of which the loading of the cassette is prevented when this lever is in the released position.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the actual examples shown in FIGS. 1 to 6, the paper feed cassette 1-1 is detachable from the main body of a device such as a copying machine or a printer, and is attached to the main body of the device as shown in FIG. Paper stack 1 placed on the bottom plate 1-3 of the cassette 1-1
Calling roller 2 pivotally supported at the end of the front bar on the top of -2
-1 is pressed against it by its own weight, and rotates intermittently in response to a paper feed command to feed the paper.

Regarding the paper conveyance force direction, there is a foot roller 3 downstream.
-1 is provided on the shaft 3-3, and rotates in the direction of the paper feeding force in synchronization with the calling roller 2-1. A unit 6-1, which will be described later, includes a separating roller 3-2 which has a friction coefficient Ui' slightly lower than the feed roller 3-1 and rotates only on the surface that is stationary or forces the sheet to return.
The shaft end is fitted into a notch at the upper end of a bracket 3-4 fixed to the bracket 3-4, and is pressed against the shifting roller 3-1 by a spring 3-6 and a lever 3-5. Therefore, when two or more sheets of paper are fed, the best one is determined by the difference in the friction coefficient between the sheets and the N friction coefficient between the paper and the feed roller 3-1 and separation roller 3-2. Only the sheets can be separated and sent out. When only one sheet of paper is fed, the force of the friction coefficient between feed roller 3-1 and the paper is separated by roller: 3.
-2 is larger than the coefficient of friction between the paper and the paper, so the paper is sent out by the feed roller 3-1. Upper guide plate 11- is attached to the roller pair of feed roller 3-1 and separation roller 3-2.
A lower conveyance roller 5 is provided on the T side of the paper path via the T-section guide plate 11-2' and a T-section guide plate 11-2'. It is pressed against the conveyor roller 5 via a material forming lever 4-2 which is pivotally supported by the I plate, and the paper is conveyed while being held therebetween.

The bracket 3-4 to which the separation roller 3-2 is attached and the T guide plate 11-2 are pivotally supported by the unit 6-1, which is swingably supported by the stay 7-1 attached to the main body 111-1.10-2. It is attached to 1. The notch of the bracket 7-3 provided on one side of the unit 6-1 is pivotally supported by a pin 8-3 embedded in the base plate 11, and is biased in the opening direction by a screw holder 8-4. A retaining pin provided at one end of the push-up lever 8-1 engages, and the unit 6-1 is pushed up, and as shown in FIG. They are positioned in abutment and the operating position shown in FIG. 1 is maintained.

The end of the push-up lever 8-1 opposite to the end that engages with the unit 6-1 is bent into a "U" shape, and a tongue piece 8-5 is provided near it (No. 519) , No. 6, of course). A set lever 9-1 is pivotally supported on a pin 9-3 implanted at a portion 41111 of the base plate 11, and is rotated in the counter-timetable direction in FIG. 1 by a spring 9-2, which is weaker than the spring 8-4. The green one on the left side is the tongue piece 8- of the push-up lever 8-1.
It is pressed to 5. A notch is provided in the upper part of the left edge of the center lever 9-1.

As shown in FIG. 4, a protrusion 6-2 is provided on the upper left side of the unit 6-1 in FIG. There is.

In addition, a paper feed cassette bottom plate lifting arm 12-2 is attached to the shaft 12-1 (6th cabinet) pivotally supported by the board 11, and a lever (not shown) or a cam provided on one surface of the cassette 1 μm, etc. As 1ull 12-1 is rotated, the cassette bottom plate 1-3 /f is pressed and retracted, thereby calling up the east upper surface of the paper on the bottom plate 2-1.
It presses against the paper to apply paper feeding pressure, and then lowers and separates it.

Below, we will explain how this device works to clear paper jams when they occur.

If a paper jam 9 occurs between the guide plates 11-1 and 11-2 or near the pair of transport rollers 4-1.5 beyond the guide plates 11-1 and 11-2, first remove the paper feed cassette 1-1 from the equipment as shown in FIG. Remove the main body, hold the right end of the push-up lever 8-1, and remove the spring 8-4.
When the protrusion 8-5 is lifted in the direction of the arrow against the force of
is the set lever pressed by spring 9-2.
It moves along the edge of 9-1 and is fixed by being inserted into the notch. The unit 6-1 thereby rotates clockwise around the shaft 7-1, and the guide plates 11-1 and 11-
2, and the feed roller 3-1 and separation roller 3-2 are also separated. At the same time, the protruding portion 6-2 of the upper left end jaws 11 of the unit 6-1 pushes up the shaft end of the upper feeding roller 4-1 to open the nip of the upper feeding roller 4-1.5. In this case, the right end of the push-up lever 8-1, which is fixed by the notch of the set lever 9-1, is in a position that occupies a part of the space occupied by the push-up cassette 1-1 when it arrives at the insertion cassette 1-1, and each Since the pair of rollers and the pair of guides are wide open, it is extremely easy to visually recognize and remove the jarred paper.

To reset the unit 6-1, hold the protrusion provided at the upper end of the set lever 9-1 and rotate it clockwise in FIGS.
is no longer engaged with the protruding piece 8-5, and the push-up lever S-1 is rotated in the open direction around the shaft 8-3 by the spring 8-4, and the Schnitt 6-1 is in the operating position shown in FIG. Being pushed up.

The push-up lever 8-1 is in the open position shown in FIG.
-1-1 because it obstructs the installation path of unit 6-
It is not possible to send cassette 1-1 without resetting cassette 1-1, and forgetting to reset the cassette is completely prevented, and there is no need for a device to detect or indicate that the cassette has been re-set, which is useful for reducing costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the paper feeding mode of the embodiment of the present invention, FIG. 2 is a cross-sectional view showing the release position of the device, and FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. , Fig. 4 is a perspective view 1 showing the vicinity of the pair of ends of the conveyance roller, Fig. 5 is a perspective view showing the engaged state of the push-up lever and the set lever, and Fig. 6 shows the push-up lever and the board that pivotally supports it. It is an exploded perspective view. 1-1...Paper feed cassette 1-2...Paper stack 3-1...Paper feed roller 3-2...Separation roller (frictional part) 4-1.5...Transport roller pair 8 -1...Push-up lever 11-1.1-2...Guide plate vs. agent Patent attorney Takehisa Ito

Claims (1)

[Claims] (1) Multi-feed separation paper feeding means consisting of a friction member that can sandwich the paper stored in a paper feed set that is detachable from the main body of the device and can come into contact with and separate from the paper feed roller and the paper path, and upper and lower parts that can be moved close to and separated from each other. In a paper jam release device for a paper feeder that feeds paper sheets one by one to a device via a guide root and a pair of transport rollers that can come into contact with and separate from each other while sandwiching the paper path, the above-mentioned paper separation means, upper and lower guide plates, and a general feeder are used. It has a lever that can be moved between a release position that separates the roller pairs from each other and a return position that returns them to a predetermined operating position. A paper jam release device that can be operated only when the paper feed cassette is disengaged, and that in the released position, a part of the lever occupies a part of the space occupied by the paper feed cassette when the paper feed cassette is attached. (21. The paper jam release device according to claim 1, wherein when the lever h is in the release position, reinstallation of the paper feed cassette is prevented.