JP3199491B2 - Paper tray - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed tray for supplying paper to an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art For example, in a copying machine of an electrophotographic system, a paper cassette is detachably mounted on a main body in order to eliminate the inconvenience of manually inserting paper from outside the machine for each copy. A configuration is adopted in which one sheet is automatically taken out from the uppermost surface of a sheet bundle stored in a cassette for each copy, conveyed to a transfer unit, and transferred.

[0003] Some of these types of technology include, for example,
JP-A-1-285535, JP-A-2-37139.
JP, and the like JP 60-30445. JP-A-1-285535 and JP-A-60-3044
Japanese Patent Application Laid-Open No. 5 (1999) -2005 discloses a technique for determining whether a sheet storage portion can be moved based on the open / closed state of a door, a cover, a door, and the like.

The relationship between the position of a sheet storage device (for storing a large number of sheets such as plain paper and sheets) and the state of an opening for removing a misfeed sheet is shown in FIG. There are four types.

[0005]

However, in the above-mentioned prior art, in the state of No. 4 in FIG. 5, that is, in the state where the sheet storage device is pulled out and the opening is opened, the opening is opened. By inserting the hand, it is possible to touch the driving portion, the harness, and the like of the sheet feeding device, which is dangerous. Further, in a case where the sheet storage device is pushed in while the hand is inserted through the opening, injury to the human body is inevitable.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet feeding tray in which when one of the sheet storage device or the opening is operated, the other operation cannot be performed, thereby improving safety. .

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a sheet storage device capable of storing a large number of sheets and capable of being pulled out in a direction perpendicular to the sheet conveying direction. A sheet feeding device that separates and conveys sheets one by one, an opening for removing a misfeed sheet, and a door for opening and closing the opening, wherein the door is an outer door and an inner door; The outer door can be opened when the sheet storage device is pulled out.
And means for preventing the inner door from being opened , and means for preventing the sheet storage device from being pulled out when the opening is opened.

[0008]

According to the above-mentioned means, the door provided on the sheet feeding tray for opening and closing the opening for removing the misfield sheet is composed of an outer door and an inner door provided inside the outer tray.
It has a double structure. Thereby, the opening of the opening is opened.
Only the inner door needs to be restrained to prohibit release. This and
In this case, the outer door can be opened, and it is possible to eliminate an illusion that the user can not open the door due to a failure or to forcibly open the door. Further, when the opening is in the open state, the sheet storage device cannot be pulled out.

[0009]

FIG. 1 is a perspective view showing one embodiment of a sheet feeding tray according to the present invention.

The paper feed tray 1 is housed in a sheet storage device 2 and can be pulled out as needed. The sheet storage device 2 is configured to be able to be pulled out in a direction orthogonal to the sheet conveying direction. In the sheet feed tray 1, a sheet feeder 3 for separating and conveying sheets one by one, an opening 4 for removing a misfeed sheet, and a door 5 for opening and closing the opening 4 are provided. Have. Door 5
Has a double structure including an outer door 6 and an inner door 7.

Further, a magnet 8 is mounted inside the outer door 6 so that the inner door 7 can be attracted. A projection 9 is provided at a side end of the outer door 6 so that an interlock switch 10 provided on the main body side can be pressed, and the interlock switch 10 can be turned on / off.

FIG. 2 is a perspective view showing a structure related to the door 5.

FIG. 2 shows a state in which the sheet storage device 2 is inserted into the sheet feeding tray 1. One end of a lever spring 11 is engaged with the rear portion of the sheet storage device 2, and the lever 1 is connected to the other end.
2 are engaged. One end of a wire 13 is engaged with a part of the lever 12, and the other end is engaged with a lever 14 disposed at a position facing the window 7 a of the inner door 7. The lever 14 has a spring 15 for applying tension to the wire 13, and the lever 14 moves in the same direction in synchronization with the inner door 7. Further, a stopper 16 is attached to the lever 14, and a distal end portion thereof is disposed so as to be fitted into the window 7a.

FIG. 3 is a perspective view showing the peripheral structure of the rear end of the sheet storage device 2. As shown in FIG.

A protrusion 2b is provided at a side end of the rear end 2a of the sheet storage device 2. A tip of an operating piece 17b connected to the armature 17a of the lock solenoid 17 by a pin is connected to the protrusion 2b. The parts are configured to be engaged. The operation piece 17b rotates around the fulcrum 17c.

As shown in FIG. 4, the lock solenoid 17
When is not energized, the armature 17a is urged upward by the urging force of a spring (not shown), and the tip of the operating piece 17b is engaged with the protruding piece 2b as shown in FIG. When the lock solenoid 17 is excited, the armature 17a descends, the operating piece 17b rotates counterclockwise, the tip of the operating piece 17b comes off the protruding piece 2b, and the sheet storage device 2 moves rightward in the figure. It is possible to move.

Next, the operation of the embodiment having the above configuration will be described.

Here, the state in which the sheet storage device 2 is set and the state in which the door 5 is closed is defined as an "initial state". In this initial state, the interlock switch 10 is pressed by the projection 9 of the outer door 6 and is in a “closed” state, and power is supplied to the lock solenoid 17 connected in series to the interlock switch 10.

During energization of the lock solenoid 17, the operating piece 17b is released as described above,
Withdrawals are allowed. On the other hand, the lever 12 shown in FIG.
Is held down in the direction a by the rear end 2 a of the sheet storage device 2, and the stopper 16 is rotated in the direction a in FIG. 2 by the urging force of the spring 15 and retracted to a position where the movement of the inner door 7 is not hindered. I do.

First, when the outer door 6 is opened from the initial state,
The inner door 7 is also opened by being attracted by the magnet 8 attached to the outer door 6, and the opening 4 is exposed. At this time, the outer door 6
The interlock switch 10, which has been pressed by the protrusion 9, is opened, the power supply to the lock solenoid 17 is cut off, the operating piece 17b does not separate from the protruding piece 2b, and the sheet storage device 2 is pulled out of the sheet feeding tray 1. Is forbidden.

On the other hand, when the sheet storage device 2 is pulled out from the initial state, the urging force of the lever spring 11 overcomes the urging force of the spring 15, and the lever 12 and the stopper 16 rotate in the direction b in FIG. Window 7a of inner door 7
Invading and stopping. At this time, even when the outer door 6 is opened, the window 7 a of the inner door 7 is locked by the stopper 16, so that the outer door 6 is not opened even by the attraction of the magnet 8.
Therefore, the opening 4 holds the closed state.

As described above, according to the present invention, when the sheet storage device 2 is pulled out, the opening of the opening 4 is prohibited, and when the opening 4 is open, the sheet storage device 2 is opened. Can be prohibited.

[0023]

As described above, according to the present invention, the opening
The door for opening and closing the mouth has a double structure of the outer door and the inner door
So that when the sheet storage device is pulled out
The outer door can be opened, and it is possible to eliminate an illusion that the user cannot open the door due to a failure or to forcibly open the door. Further, when one of the sheet storage device and the opening is operated, the other operation cannot be performed, so that safety can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a sheet feeding tray according to the present invention.

FIG. 2 is a perspective view showing a configuration related to the door of FIG.

FIG. 3 is a perspective view showing a peripheral configuration of a rear end portion of the sheet storage device.

FIG. 4 is a front view showing a configuration of a lock solenoid shown in FIG. 3;

FIG. 5 is an explanatory diagram showing a plurality of correlations between the position of the sheet storage device and the state of an opening for removing a misfeed sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper feed tray 2 Sheet storage device 2a Rear end 2b Projection piece 3 Paper feed device 4 Opening 5 Door 6 Outer door 7 Inner door 7a Window 8 Magnet 9 Projection 10 Interlock switch 11 Lever spring 12 Lever 13 Wire 14 Lever 15 Spring 16 Stopper 17 Lock solenoid 17a Armature 17b Working piece 17c Support

Claims (1)

(57) [Claims] 1. A sheet storage device that can store a large number of sheets and can be pulled out in a direction perpendicular to the sheet conveying direction, a sheet feeding device that separates and conveys the sheets one by one, and removes a misfeed sheet. Opening, and a sheet feed tray having a door for opening and closing the opening, wherein the door is formed as an outer door and an inner door, and when the sheet storage device is pulled out, Outside door
A sheet feeding tray, comprising: means for opening the inner door and making the inner door unopenable; and means for making the sheet storage device unable to be pulled out when the opening is opened.