JPS6254731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding mechanism of an electrophotographic apparatus or a printing machine, and more particularly to a fixing device for a paper feeding table forming a part of the paper feeding mechanism.

Large electrophotographic devices, printing devices, and the like consume a large amount of single sheets, so sheets are frequently replenished onto the paper feed table. By the way, the paper feeding mechanisms used in these devices are generally equipped with a mechanism that uses power to raise the paper feeding tray to the paper feeding position, and also has a mechanism that uses power to raise the paper feeding tray to the paper feeding position, and also has a mechanism that uses power to raise the sheet feeding tray to the paper feeding position. is equipped with a paper feed roller that operates in synchronization with other devices. For this reason, if you pull out the paper feed tray while it is feeding paper because it is necessary to replenish sheets, etc., it will not only cause accidents such as sheet damage and paper jams, but also cause damage to the paper feed roller, paper end detection member, etc. This may cause damage to the paper feed tray, or an accident such as a malfunction of the paper feed tray lifting device.

The present invention aims to eliminate such operational errors with respect to this type of paper feeding mechanism, and the present invention aims to eliminate such operational errors with respect to this type of paper feeding mechanism. An object of the present invention is to provide a paper feed table fixing device.

Hereinafter, the details of the present invention will be explained based on the drawings.

FIG. 1 shows an example of a recording device to which the present invention is applied, in which a writing unit 2 for writing a visible image on a photoreceptor 1 according to an input image signal, and a writing unit 2 on the top of the device body. A well-known electrophotographic recording device includes a developing unit 3 that develops a latent image with toner, a transfer charger 4 that transfers the toner image onto a sheet, and a unit 5 that fixes the transferred toner image on the sheet. is stored. Further, in the lower part of the main body of the apparatus, two upper and lower paper feed trays 10, 10 containing sheets of the required size are loaded so that they can be pulled out toward the front in the figure, and one upper side of each of these paper feed trays 10, 10 is loaded. is provided with a series of transport rollers including a paper feed roller 30 that feeds the stored sheets in synchronization with the operation of the recording apparatus.

FIGS. 2 and 3 show the main parts of the paper feed tray 10 having the characteristic parts of the present invention, and reference numeral 11 indicates the paper feed tray 1.
The bottom plate can also be called the base of 0, and the four corners have L.
A letter-shaped screen 12 is attached, and guide holes 12a formed vertically in this wall guide the elevation and descent of a platform 13, which will be described later. 13a is a pin implanted in this platform 13 and sliding in the guide hole 12a, and pins 13b and 13 implanted in the rear left and right sides of the platform 13
Each end of two wires 14 and 14', which will be described later, is tightened at c. Reference numeral 15 indicates a main pulley which is driven by the motor 16 and raises and lowers the platform via wires 14 and 14'. 14
- Idle pulley 18 directly above the other pin 13c
-Hang it over the other pin 13c and connect the other wire-
14' across one pin 13b, the idle pulley 19 directly above it, the idle pulley 20 directly below the other pin 13c, and the other pin 13c, by rotating the main pulley 15 in the direction of the arrow, As shown in FIG. 2, the platform 13 is pulled up horizontally in the longitudinal direction. Although not shown in the drawings, it goes without saying that a similar horizontal lifting mechanism using idler pulleys and wires is also provided in the width direction.

Reference numeral 21 indicates a handle for drawing out the paper feed tray attached to the center of the front side of the bottom plate 11;
A lock release lever 22 is provided on one side of the lock release lever 22 at a position that can be operated by placing the thumb on it.
The mechanism including this constitutes the main part of the present invention.

That is, as is clear from FIG. 3, which is a bottom view of the bottom plate 11, the lever 22 forms a bent crank and is swingably supported by a bracket 23 fixed to the bottom plate 11. 2
Reference numeral 4 designates a lock lever which is pivoted on the opposite side of the lock release lever 22 with left rotation by a spring 25, and forms a bell crank that swings around a pivot point 24a, one end 24b of which is a locking portion 24c that is coupled to the rod 26 that transmits the movement of the lock release lever 22, and whose other end locks to the edge of a window hole 26a formed in the frame member 26 at the rear of the device;
It forms a lock-shaped portion having a guide slope 24d that slides into contact with this edge and fits into the window hole 26a. Reference numeral 27 denotes a regulating lever for regulating the rotation of the lock lever 24. As is clear from FIG. A rotational force is applied in the clockwise direction in the figure. Reference numeral 27a denotes an arm that extends to the side of this lever 27, and a pin 27b that comes into contact with the lower edge of the platform 13 is implanted at the tip of the arm. A fitting recess 27c, a rotation regulating stepped portion 27d of the lock lever 24, and a stopper 27e that comes into contact with the lower surface of the lock lever 24 to regulate its own rotation.
is formed in three stages.

In addition, the reference numeral 29 in FIGS. 2 and 3 is a presser plate that presses the side surface of the sheet, and is attached so as to be movable within the widthwise slit 11a bored in the bottom plate 11.
The sheet is fixed at a position corresponding to the size of the sheet by the click member 29a. 30 is a paper feed roller that feeds the sheet in synchronization with the operation of the recording device; 31;
31' is a separation roller for preventing multiple sheet feeding; 32, 3;
2 indicates a conveyance roller.

In the embodiment described above, the platform 13 is now driven up by the main pulley 15, and
When the sheets loaded thereon are being sent out toward the recording device, the regulation lever 27 is moved by the spring 28.
is biased by and rotates clockwise, and its stopper 2
7e is in contact with the lower surface of the lock lever 24, and is in an upward position as shown in FIG. The locking portion 24 of the lock lever 24 is prevented from moving.
c maintains engagement with the edge of the window hole 26a of the frame member 26 to fix the paper feed table 10 in a predetermined position.

When it becomes necessary to replenish sheets, an operation button (not shown) is pressed to reverse the main switch 15. As a result, the platform 13 descends to the lowest point, and at this time, the lower edge touches the pin 27b.
Push down to rotate the regulation lever 27 counterclockwise against the spring 28. As a result, the regulating lever 27 assumes a horizontal position as shown in FIG. 4, allowing the locking lever 24 to rotate freely. Therefore, if you grasp the handle 21 with your right hand and rotate the lock release lever 22 counterclockwise with your thumb,
The lock lever 24 rotates clockwise against the spring 25, and the locking portion 24c comes off the edge of the window hole 26a, allowing the paper feed tray 10 to be pulled out. In addition, when loading the paper feed tray 10 that has been pulled out once, by pushing it in as it is, the lock-shaped portion is inserted into the window hole 26a as it is by the guide slope 24d provided on the lock lever 24, and then again. The paper feed tray 10 is fixed in the locked state.

Although the present invention has been described above using an example of a recording device, it goes without saying that the present invention can be applied to other large copying machines, printing machines, etc. that require this type of paper feeding device. Further, in the above-described embodiment, the restriction lever 24 is provided with the fitting recess 27c and the stopper 27e, but in view of the gist of the present invention, it is sufficient to provide the restriction lever 24 with a restriction portion that prevents movement of the lock lever 24. You can understand that.

As described above, according to the present invention, the paper feed table is provided with a lock lever that can be engaged with and disengaged from a part of the apparatus main body, and the paper placement member is placed on the paper feed table only when the paper placement member is lowered to the lowest position. We have provided a lock lever regulating lever that comes into contact with a part of the member and moves in the direction of releasing the lock lever, so even if you try to pull out the paper feed tray when feeding paper, it will prevent you from pulling it out and prevent you from making mistakes. In addition to preventing accidents such as paper jams or equipment malfunctions caused by paper jams, the lock lever is locked via a regulation lever that is displaced when it comes into contact with the paper placement member. Even if you try to pull out the paper feed tray by operating the lock lever when the paper placement member is activated, the paper placement member will descend without any hindrance, and by displacing the regulation lever, the paper feed tray will be smoothly moved. can be withdrawn.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a recording apparatus to which the present invention is applied, FIG. 2 is a rear view of the main parts of a paper feed tray showing an embodiment of the present invention, and FIG. 3 is a bottom view of the same apparatus. Figures 4A and 4B are diagrams showing the operation of the regulation lever. 10...Paper feed stand, 11...Bottom plate, 13...Platform, 15...Main pulley, 21...Handle, 22
...Lock release lever, 24...Lock lever, 26
...Frame, 27...Regulation lever.

Claims (1)

[Claims] 1. Paper feed tray 1 having a paper placement member 13 that can be raised and lowered
In a paper feeding device in which a 0 is attached so that it can be pulled out from the main body, a lock lever 24 that can be attached to and detached from a part of the main body of the device is provided.
is operably attached to the paper feed tray 10, and the lock lever 24 is in contact with a part of the paper placement member 13 only when the paper placement member 13 is lowered to the lowest position. A fixing device for a paper feed tray, characterized in that a lever 27 for regulating the lock lever is attached, which is displaced in a direction of releasing the lock.