JPS58197136A - Paper feeding apparatus - Google Patents

Abstract

PURPOSE:To permit a cassette to be automatically withdrawn with a biasing member lowered when the cassette is required to be withdrawn, by providing the biasing member with a follower section capable of following a cam of a paper feeding cassette, in a paper feeding apparatus wherein the biasing member is automatically biased up. CONSTITUTION:When a paper feeding command signal is dispatched, the biasing member 5 is raised to the position indicated by solid line, and the recording paper sheets (B) in a paper feeding cassette (A) are fed to a paper feeding unit 4. For instance, if power failure or something like that has occurred, the biasing member 5 remains raised. In this case, if the paper feeding cassette (A) is withdrawn, since the follower piece 16 of the biasing member 5 can be engaged with the cam 14 so that the biasing member 5 is lowered to the position indicated by dotted line, a roller 17 of the biasing member can press through a notch 13 in the cassette (A) and therefore the cassette (A) can be taken out from a paper feeding table 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device for, for example, an electrophotographic copying machine, and particularly to a paper feeding device of a type in which the bottom plate of a paper feeding cassette on which recording paper (sheets) is placed automatically flips up to feed paper. IA to paper feed device
do.

As is well known, in the paper feed section of electrophotographic copying machines, paper is often fed by flipping up toward the paper feed unit such as the paper feed roller on the bottom plate of the paper feed cassette. In the paper feeding device, when the paper feeding cassette is attached to or removed from the paper feeding IK, it is necessary to retreat the flip-up member from the paper feeding cassette.

For this reason, conventionally, a manual lever to prevent the flip-up member is provided on the paper feed table, and this manual lever is operated each time the paper feed cassette is inserted or removed, but operating these 9 manual levers is very time-consuming. Yes. Further, even when a manual lever is not used, a separate operating member is required to retract the flip-up member.

In order to solve such problems, the present applicant proposed a paper feeding device having a structure as shown in the first figure in 1982, in patent application No. 5 JBO52. That is, this paper feeding device is
A paper feed unit 4 consisting of a paper feed belt 2 and a peeling member 8 is provided on the side of the paper feed tray 1 on which the paper feed cassette A is attached, and a , a flip-up member 6 is incorporated which is raised to the position shown by the solid line every time a paper feed command signal is transmitted.

Therefore, according to such a paper feed md, when there is no paper feed command signal, the flip-up member 5 is retracted below the paper feed tray l, so there is an advantage that the paper feed cassette A can be freely inserted and removed. be.

By the way, with this configuration, if the device stops operating for some reason, such as the power plug being accidentally pulled out of the outlet or a power outage occurring during the paper feeding operation,
Since the flip-up member 5 is stopped in the upright position, the paper feed cassette A cannot be pulled out from the paper feed table.

The present invention provides a paper feeding device that automatically flips up the flip-up member, even if the power plug is unplugged or a power outage occurs.
The present invention proposes a paper feeding device having a structure in which a paper feeding cassette can be freely removed from a paper feeding table.

Hereinafter, the details of one embodiment of the invention will be explained with reference to FIG. 2 and the plant 81d.

FIG. 2 is a sectional view corresponding to FIG. 1 showing the paper feeder of the present invention, and the same structural parts as in FIG. 1 are designated by the same reference numerals.

According to the present invention, the bottom wall 1OK of the paper feed cassette)A is formed with an opening All for receiving the flip-up member 5, and this opening ll is used to insert the paper feed cassette as shown in FIG.
The bottom wall 1o has a cam 14 protruding into the opening 11, and the cam surface 14 of the cam 14 when drawing out the paper feed cassette A.
A driven piece 16 formed by folding a part of the flip-up member S downward is located within the range of motion a. As for the operating mechanism of the flip-up member 5, a spring is used for the flip-up force, and a cam is used for the push-down operation.

Since the above-mentioned embodiment has the above-described structure, the power plug may be unintentionally pulled out of the outlet during paper feeding, or a stop may occur, causing the flip-up member to stop at the position shown by the line in Figure 2. If this happens, simply push/pull the paper feed cassette A in the direction of the arrow X. That is, when the follower 16 engages the cam 14 as the paper feed cassette A is pulled out, the flip-up member 5 is moved to the position shown by the temporary line Ilj in FIG. Because it's pushed up against me,
The roller 17 at the tip of the flip-up member/material 5 is shaped so that it can pass through the notch 18 of the paper feed cassette A, and the paper feed cassette A can be pulled out from the paper feed table l.

As is clear from the above description, according to the present invention, the supply □
Even if the power plug is inadvertently pulled out while the paper is being inserted, or the device stops due to a power outage or other reason, the paper cassette can be freely pulled out, so the bottom plate of the paper cassette can be automatically flipped up. In addition to fully demonstrating the operability of the paper feeding device, the structure of the present invention is extremely simple, so there is an advantage that it can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional paper feeder, FIG. 2 is a cross-sectional view of a paper feeder according to the present invention, and FIG. 8 is a perspective view of the main parts of the paper feeder. A...Paper feed cassette, B...Recording paper, l...Paper feed table, 4...Paper feed unit, 5...Flip-up member, 1
4...Cam, 16...Driver piece.

Claims (1)

[Claims] 1) In a paper feed device including a flip-up member that automatically flips up the bottom plate of the paper feed cassette toward the paper feed unit that takes out the recording paper from the paper feed cassette mounted on the paper feed tray,
Paper feeding device, characterized in that a driven part driven by a cam of the paper feed cassette is provided on the flip-up member, and the flip-up member is lowered when the paper feed cassette is forcibly pulled out from the paper feed table. .