JPH04260547A - Paper feed device - Google Patents

Abstract

PURPOSE:To facilitate the countermeasure for jamming in a japer feed device. CONSTITUTION:A support arm (hold plate) 15 is rotatably attached to a paper feed device 3 through the intermediary of a shaft 13, and a pick-up roller 19, a paper feed roller 16, one 21 of a pair of feed rollers and an upper guide are supported to the arm 15. When jamming of a sheet P occurs, the support arm 15 is turned upward about the shaft 13 so as to expose the pick-up roller 19, the paper feed roller 16, the feed roller 21 and the upper guide 20, and accordingly, the pinched sheet P is released and removed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeder in an image forming apparatus, and more particularly to a jam handling mechanism in a paper feeder.

0002

[Prior Art] Conventionally, in a paper feeding device that uses a retard separation method in which sheets are fed out from a sheet loading table by a pickup roller, the sheet is sandwiched between a feeding roller, a retard roller, and a pair of conveyance rollers downstream of the feeding roller. When the paper feeding device stops due to a paper jam or the like, the sandwiched sheets remain in the sheet conveyance path even if the sheet loading table is pulled out toward the front.

0003

However, in the conventional example described above, if jam processing is performed with the sheet sandwiched between the paper feed roller, retard roller, and transport roller pair,
Even if the sheet mounting table is pulled out toward the front, the sheet remains in the conveyance path, making it difficult to clear the jam.

Therefore, the present invention facilitates jam handling by rotatably mounting a support arm that supports a pickup roller that feeds out sheets from a sheet loading table, a paper feed roller, and one of the conveyance rollers. The object of the present invention is to provide a paper feeding device that can

[0005]

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned circumstances. For example, as shown with reference to FIGS. A pickup roller (19) that feeds out the placed sheet (P)
), a paper feed roller (16) that feeds the fed sheet (P), and a retard roller (23) that is disposed opposite to the paper feed roller (16) and separates the sheet (P).
and the paper feed roller (16) and retard roller (23).
In the paper feeding device (3), the pickup roller (19) and the paper feeding roller (16 ), and one of the pair of conveyance rollers (21)
The present invention is characterized in that a support arm (15) is provided which integrally supports the paper feeding device (3).

[0006]

[Operation] Based on the above configuration, the sheet (P) is placed on the sheet mounting table (10), the sheet (P) is fed out by the pickup roller (19), and the sheet (P) is fed out by the pickup roller (19).
) is separated one by one by the retard roller (23), and at the same time, the paper is fed to the downstream transport roller pair (21, 29) by the paper feed roller (16), and then to the transport roller pair (21, 29).
, 29).

[0007] At this time, if a paper jam or the like occurs in the conveyance path including the pickup roller (19), paper feed roller (16), retard roller (23), and pair of conveyance rollers (21, 29), the pickup roller ( 19), paper feed roller (
16) Lift the support arm (15) that supports one of the pair of transport rollers (21) about the pivot point (13) of the paper feeder (3) to clear paper jams and other jams.

[0008] Note that the above symbols in parentheses are illustrative and do not limit the present invention in any way.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 indicates an image forming apparatus. 2 is a main body of the image forming apparatus; 3 is a paper feeding device that feeds paper to the image forming apparatus main body 1; 5 is an upper section of the paper feeding device 3; 6 is a lower section; is movable in the direction of arrow A, and the lower part 6 is provided with a paper feed cover 7 and a sorting guide member 9 as shown in FIG. A stand 10 is attached, and the paper feed cover 7 can be taken out in the direction of arrow B shown in FIG. and,
Sheets P are stacked on a paper feed tray 10.

[0011] Further, an upper plate 11 is horizontally attached to the main body 2, and a bracket 12 is provided on this upper plate 11.
A holding plate 15 is rotatably attached to this bracket 12 via a shaft 13.

A paper feed roller 16 is rotatably attached to the holding plate 15 via a shaft 16a, and a pickup roller 19 is attached to the tip of an arm 17 that supports this shaft 16a.
is rotatably attached via a shaft 19a, and the shaft 19a, that is, the pickup roller 19, is rotationally driven from the shaft 16a via a belt (not shown) or the like.

An upper guide 20 is attached to the holding plate 15 on the end side of the paper feed roller 16, and a conveying roller 21 is attached to the tip of the holding plate 15 via a shaft 21a. Note that a handle 22 is provided at the upper end of the holding plate 15.

Further, a retard roller 23 is rotatably attached to the main body 2 via a shaft 23a, which presses against the paper feed roller 16 from below. A lower guide plate 26 is attached to the end.

An upper guide plate 27 is attached to the lower guide plate 26, and a conveyor roller 29 that presses against the conveyor roller 21 from below is attached to the main body 2 through a shaft 29a at an intermediate position of the lower guide plate 26. installed on.

Next, the operation of this embodiment will be explained.

The sheet P is fed out from the sheet feeding table 10 by the pickup roller 19, separated one by one by the retard roller 23, and then transferred to the conveying roller pair 2 by the sheet feeding roller 16.
1, 29, and then being transported into the main body 2 by the transport roller pair 21, 29, the sheet P is transported to the paper feed roller 16, the retard roller 23, and the transport roller pair 21, 29.
29 and the paper feeding device 3 stops, when removing the sandwiched sheet P, first move the upper part 5 along the arrow A.
After moving in the direction, grasp the handle 22 and move the shaft 13 upward.
When rotated in the direction of arrow F about , the state shown in FIG. 1(a) changes to the state shown in FIG. 1(b), and the sandwiched sheet P can be easily removed in the direction of arrow C.

Next, another embodiment will be explained with reference to FIG.

In this embodiment, a holding plate 15', which replaces the holding plate 15, is rotatably attached to a bracket 12' provided at the rear end of the upper plate 11 via a shaft 13.

When the sheet P is sandwiched between the paper feed roller 16, the retard roller 23, and the transport roller pair 21, 29 and the paper feed device 3 stops, the user grasps the handle 22' and moves the shaft 13 in the direction of the arrow E. When pushed up centering on the sheet P
can be easily removed in the direction of arrow D.

[0021] In the above embodiment, a paper feeder employing a front loading method has been described, but the present invention can be similarly applied to paper feeders using other methods.

[0022]

[Effects of the Invention] As explained above, according to the present invention,
A pickup roller, a paper feed roller, and one of a pair of transport rollers are integrally supported by a support arm pivotally supported by a paper feeder, and when a sheet is caught and the paper feeder stops, The support arm is lifted upward about the pivot point, and the retard roller and one of the pair of conveyance rollers, which are located above the pair of conveyance rollers and the feed roller that nip the sheet, are moved. Since it is opened to the lower side of the pair of paper rollers, the sandwiched sheet is released, so that the sandwiched sheet can be easily removed, which has the effect of facilitating jam removal.

[Brief explanation of the drawing]

FIG. 1(a) is a cross-sectional front view of a paper feeding device according to an embodiment of the present invention, and FIG. 1(b) is a cross-sectional front view showing a state in which its support arm is opened upward.

FIG. 2 is a perspective view of an image forming apparatus embodying the present invention.

FIG. 3 is a perspective view of a paper feeding device showing another embodiment.

[Explanation of symbols]

3 Paper feeding device 10 Sheet loading table (paper feeding table) 13
Pivot point (axis) 15 Support arm (holding plate) 16
Paper feed roller 19 Pick-up roller 21 One side of the transport roller pair 21, 29 Transport roller pair 23 Retard roller P Sheet

Claims (1)

[Claims] 1. A pickup roller that feeds out a sheet placed on a sheet loading table, a paper feed roller that feeds the fed sheet, and a retard roller that is disposed opposite to the paper feed roller and separates the sheet. and a pair of transport rollers that are disposed downstream of the paper feed roller and the retard roller and transport the sheet,
It is characterized by comprising a support arm that integrally supports the pickup roller, the paper feed roller, and one of the pair of transport rollers, and the support arm is pivotally supported by the paper feed device. paper feed device.