JPS626033Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper feed tray device for an electrophotographic copying machine or the like.

Generally, in a variable magnification type copying machine, it is necessary to determine whether or not a recording paper cassette suitable for a desired copy size is attached to a paper feed table.
FIG. 1 shows a conventional paper feed tray device used for this purpose, in which a paper feed tray 1 into which a recording paper cassette A can be inserted is provided with stoppers 2A and 2B for blocking the recording paper cassette A. and these stopper 2
A plurality of microswitches 3A, 3B, and 3C are arranged along the rear end of the recording paper cassette A between A and 2B. Therefore, with such a structure, the microswitches 3A, 3B, and 3C can detect the presence or absence of the cam projections 4A, 4B at the rear end of the recording paper cassette, which is information about the type of stored recording paper. However, with such a structure, the recording paper cassette A may not be inserted into the paper feed tray 1 correctly until it hits the stoppers 2A, 2B, or the recording paper cassette A may not be inserted correctly into the paper feed tray 1 due to mechanical play between the paper feed tray 1 and the recording paper cassette A. If the paper cassette A is inserted with one side facing up as shown by the phantom line in FIG. 1, accurate type information cannot be read and malfunction may occur. Further, there is also the drawback that accurate detection cannot be made when the actuator of the microswitch used as the detection member is bent and the next recording paper cassette is inserted.

The present invention has been developed in view of the actual situation of the conventional paper feed tray device as described above, and even if the paper cassette is not inserted accurately to the predetermined position or is inserted facing one side, the type information of the paper cassette is not displayed. The present invention proposes a paper feed tray device that can accurately read the information without damaging the switch.

Embodiments of the present invention will now be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a sectional view corresponding to FIG. 1 of the paper feed tray device according to the present invention, and inside the paper feed tray 1 is located a movable mounting plate 5 that is slidable in the insertion direction of the recording paper cassette A. . That is, this movable mounting plate 5 has a paper feed tray 1.
A plurality of elongated holes 7A, 7B, 7C are formed into which a plurality of guide pins 6A, 6B, 6C planted in the cassette are inserted. Guide pins 6A, 6B, so that the movable mounting plate 5 can be followed even if the
It is better to make it slightly larger than the outer diameter of 6C. The movable mounting plate 5 is biased in the direction of arrow X by springs 8A and 8B wound around the guide pins 6A and 6C,
Stoppers 9 are folded at right angles on the front of both ends.
A, 9B are provided, and these stoppers 9A, 9
The structure is such that it can be engaged with the rear surface a of the recording paper cassette A. Further, a plurality of micro switches 3A, 3B, 3C are fixed on the surface of the movable mounting plate 5, and these micro switches 3A, 3B, 3C
The presence/absence information of the cam protrusions 4A, 4B on the recording paper cassette A can be detected by this.

Since the above embodiment has the above structure,
The movable mounting plate 5 follows the recording paper cassette A inserted into the paper feed tray 1, so even if the recording paper cassette A is inserted insufficiently into the paper feed tray 1 or is inserted facing one side, it will be securely inserted. The presence or absence of the cam protrusions 4A, 4B can be detected, so that there is no possibility of misreading the type information of the recording paper cassette A and causing malfunction.

As a result, according to the present invention, even if the recording paper cassette is inserted insufficiently into the paper feed tray or is inserted with one side facing the recording paper cassette, there is no possibility of misreading the type information of the recording paper cassette.

[Brief explanation of the drawing]

Figure 1 is a horizontal sectional view of a conventional paper feed tray device;
The figure is a horizontal sectional view of the paper feed tray device according to the present invention.
This figure is a sectional view corresponding to FIG. 1 of the paper feed tray device according to the present invention, and FIG. 3 is a sectional view taken along the line - in FIG. 2. A... Recording paper cassette, 1... Paper feed stand, 3A,
3B, 3C...Micro switch, 4A, 4B...
...Cam protrusion, 5...Movable mounting plate, 8A, 8B...
Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In a paper feed tray device that determines the type of recording paper cassette A mounted on the paper feed tray 1 based on the presence or absence of sensitivity of a plurality of detectors, the paper feed tray device 1 reads the type of recording paper cassette A that is opposite to the insertion direction of the recording paper cassette A. A movable mounting plate 5 that can follow the recording paper cassette A by being biased in the direction by the biasing members 8A and 8B is provided on the paper feed tray 1, and a detector 3 that reads the type information of the recording paper cassette A.
A paper feeding device characterized in that A, 3B, and 3C are fixed to a movable mounting plate 5.