JPH0672578A - Paper feeder - Google Patents

Abstract

PURPOSE:To prevent occurrence of many bends and damages of paper sheets for impairing the jam removal property even if a feeder tray is drawn out and then reset from outside of the paper feeder while a jammed paper sheet is still existing in a feeder portion. CONSTITUTION:An inclined wall 3 spreading downward is provided on the outer surface of a wall at the far end side of a feeder tray 1, in a paper feeder equipped with a feeder tray 1 which can be drawn out in the direction orthogonal to the feed conveying direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device such as a copying machine or a printer, and more particularly to a sheet feeding device provided with a sheet feeding tray which can be pulled out in a direction orthogonal to a sheet feeding and conveying direction.

[0002]

2. Description of the Related Art At present, in order to save space in a copying machine, a type in which a paper feed tray is also provided on a side surface of a main body is provided at a lower part of the main body (hereinafter referred to as a front loading type)
Has become the mainstream.

However, in the case of the front loading method, the paper feed tray is pulled out in the direction orthogonal to the paper transport direction, so that the paper may be torn when the jammed paper around the paper feed tray is processed and the broken pieces cannot be removed. Cause trouble.

FIG. 8 is a block diagram of a copying machine having a front loading type sheet feeding device.

Explaining only the sheet feeding device, 1
Is a paper feed tray, 11 is a half-moon shaped paper feed roller, 12 is an openable / closable guide plate (12a indicates a set time, 12b indicates an open time) that constitutes a vertical conveyance path, 13 is a conveyance roller, and 14 is a paper feed. Sheets accommodated in the tray 1 and 15 are jammed sheets.

FIG. 9 is a configuration diagram showing a state in which the paper feed tray is reset in the state where there is jam paper, and the paper feed tray is pulled out in a state where the jam paper added to the conveying roller 13 exists. When it is reset, the jammed paper is caught on the back side wall 2 of the paper feed tray 1, and as described above, the paper may be torn and a piece of paper may remain in the machine. Incidentally, 16 is a front side plate, and 17 is a rear side plate.

As a countermeasure against this trouble, the transport roller 13
If there is paper on the jam paper 15
However, if the user pulls out the paper feed tray 1 before taking the jammed paper 15,
The same problem occurs.

The following mechanism is known as a mechanism for preventing troubles such as sheet breakage due to the user mistake. (1)
A mechanism for locking the paper feed tray 1 so that the paper feed tray 1 cannot be pulled out until the paper is removed when a jam occurs between the transport roller 13 and the paper feed tray 1. (2) A mechanism for releasing the nip of the separation unit so that the paper does not come out of the paper feed tray 1 even if the paper feed tray 1 is pulled out and the paper is not torn.

[0009]

In the above mechanism (1), a sensor for observing the removal of the jammed paper and a mechanism for locking the paper feed tray are required, which is costly. Further, when the power source is turned off, the paper feeding tray is pulled out, which is not perfect.

In the mechanism of (2), if the paper feed tray is set again to the main body in the same state, the back side wall of the paper feed tray is caught by the paper and tears occur.
There was a problem that a piece of paper was left behind, or even if it was not torn, a large number of folds were formed on the paper, making it difficult to remove when taking it out from the transport roller side.

According to the present invention, even if the paper feed tray is pulled out while the jammed paper is present in the paper feed unit and the paper is reset from the outside of the machine, a large number of folds and damages of the paper that impairs the jam removal performance are prevented. It is an object of the present invention to provide a sheet feeding device that can do the above.

[0012]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet feeding device provided with a sheet feeding tray that can be pulled out in a direction orthogonal to a sheet feeding and conveying direction, in which an inclined wall that spreads downward on the outer surface of the inner side wall of the sheet feeding tray. Is achieved by the first means.

Further, the above-mentioned object is achieved by the second means in the first means, wherein the inclined wall is formed integrally with the back side wall.

The above object is also achieved in the first means by the third means, wherein the inclined wall is made of an elastic thin plate such as mylar attached to the back side wall.

The above-mentioned object is the first means, in which the inclined wall is hinged to the back side wall and is constituted by a plate member biased by a spring so as to spread downward. To be achieved.

[0016]

According to the first means, when a jam occurs across the conveying roller and the paper feed tray and the user makes a mistake in the jam processing method and pulls out or resets the paper feed tray, the jammed paper is not fed. The sloping wall on the outer surface of the inner side wall of the paper prevents the paper from being crushed (broken into many sheets) or damaged.

In the second means, the inclined wall is formed integrally with the back side wall, so that the processing and manufacturing costs are reduced.

In the third means, the slanted wall is made of an elastic thin plate and is inclinable, so that the depth dimension of the paper feed tray can be shortened and space can be saved.

In the fourth means, the spring for biasing the plate constituting the inclined wall plays a role of buffering the paper set in the paper feed tray, so that the deviation of the paper in the paper feed tray is prevented, and It is possible to prevent the occurrence of a lateral resist defect, etc.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a block diagram showing the state of a sheet feeding tray set in the sheet feeding apparatus according to the first embodiment, and FIG. 2 is a block diagram showing the state when the set is completed.

In this embodiment, the outer surface (back surface) of the back side wall 2
The inclined wall 3 is integrally formed by forming an inclined surface that spreads downward.

Therefore, even if there is jam paper 15 as shown in FIG. 1, when the paper feed tray 1 is reset, the jam paper 1
The slanted wall 3 scoops 5 from the hook.

FIG. 3 is a schematic view of the essential portions showing the state of the sheet feeding tray set of the sheet feeding device according to the second embodiment, and FIG.
It is a whole block diagram when a set is completed.

In this embodiment, the mylar 4 is attached to the upper edge of the back side wall 2 in a state of being inclined downward, and the mylar 4 constitutes the inclined wall 3. Jam paper can be scooped up by the mylar 4 in the same manner as described above, but other than that, when the mylar 4 hits the rear side plate 17, it is folded to the back side wall 2 side as shown in FIG. Since it falls down, the size on the back side of the main body can be reduced.

FIG. 5 is a configuration diagram showing a state in which the sheet feeding tray of the sheet feeding device according to the third embodiment is being set, and FIG. 6 is a configuration diagram when the setting is completed.

In this embodiment, the upper end of the plate body 5 is hinged to the hinge portion 5a at the upper edge of the back side wall 2, and the spring 6 is elastically contacted between the plate body 5 and the back side wall 2. The plate body 5 is inclined so as to spread downward to form the inclined wall 3.

In this embodiment as well, the action on the jammed paper 15 is the same as in the first and second embodiments, but in addition to this, the plate body 5 causes the rear plate 1 to move due to the buffering action of the spring 6.
It is possible to soften the shock when hitting 7, and it is possible to prevent the deviation of the paper 14 in the paper feed tray 1.

FIG. 7 is a block diagram of the essential parts of the paper feeding device according to the fourth embodiment.

This embodiment is a modification of the third embodiment, in which a rear side fence 8 made of a conductive material and a conductive thin plate 7 in contact with both of the plate bodies 5 also made of a conductive material are provided. When the paper feed tray 1 is set in the main body, the plate body 5 contacts the grounded rear side plate 17.

Then, the paper 14 set in the paper feed tray 1 can be grounded, the accumulation of static electricity generated when the paper 14 is separated, etc. can be prevented, and the sticking of the paper 14 due to static electricity can be eliminated. It becomes possible and the separation performance is improved.

[0032]

According to the first aspect of the present invention, even if the user pulls out or resets the paper feed tray by mistake in the jam processing method when a jam occurs across the conveying roller and the paper feed tray, the jam occurs. Since the paper can be picked up by the slanted wall on the outer surface of the back side wall of the paper feed tray, it is possible to prevent the paper from being crushed (a state in which a large number is folded) or damaged.

According to the second aspect of the present invention, the inclined wall is formed integrally with the back side wall, so that the processing and manufacturing costs can be reduced.

According to the third aspect of the present invention, since the inclined wall is made of an elastic thin plate and is inclinable, the depth dimension of the paper feed tray can be shortened and space can be saved.

According to the fourth aspect of the present invention, the spring for inclining and biasing the plate member forming the inclined wall plays a role of buffering the paper set in the paper feed tray, so that the deviation of the paper in the paper feed tray is prevented. It is also possible to prevent the occurrence of defects such as scratches and lateral resist defects.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a state in the middle of a sheet feeding tray set of a sheet feeding device according to a first example of the present invention.

FIG. 2 is a configuration diagram showing a state of the paper feeding apparatus according to the first embodiment of the present invention when the paper feeding tray set is completed.

FIG. 3 is a configuration diagram of essential parts showing a state in the middle of a paper feed tray set of a paper feed device according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a state of a paper feeding device according to a second embodiment of the present invention when a paper feeding tray set is completed.

FIG. 5 is a configuration diagram showing a state in the middle of a paper feeding tray set of a paper feeding device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a state of a paper feeding device according to a third embodiment of the present invention when the paper feeding tray set is completed.

FIG. 7 is a configuration diagram of a main part of a paper feeding device according to a fourth embodiment of the present invention.

FIG. 8 is a configuration diagram of a copying machine having a front loading type sheet feeding device.

FIG. 9 is a configuration diagram of a conventional example showing a state when the paper feed tray is reset with a jammed paper present.

[Explanation of symbols]

 1 Paper Tray 2 Back Side Wall 3 Inclined Wall 4 Mylar Constituting Inclined Wall 5 Plate Constituting Inclined Wall 3 Spring

Claims (4)

[Claims] 1. A sheet feeding device having a sheet feeding tray that can be pulled out in a direction orthogonal to a sheet feeding and conveying direction, wherein an inclined wall that spreads downward is provided on an outer surface of a back side wall of the sheet feeding tray. Paper feeder. 2. The sheet feeding device according to claim 1, wherein the inclined wall is formed integrally with the back side wall. 3. The inclined wall according to claim 1,
A sheet feeding device, which is formed of an elastic thin plate such as mylar attached to the back side wall. 4. The inclined wall according to claim 1,
A sheet feeding device comprising a plate body hinged to the inner side wall and biased by a spring so as to spread downward.