JPH0258175B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device installed in a copying machine or the like.

2. Description of the Related Art Conventionally used paper feeding devices for copying machines and the like include those having structures as shown in FIGS. 1 and 2, for example.

That is, the paper feeding device 01 includes an outer box 02 and a winding shaft 0 that is rotatably supported by the outer box 02 and connected to a motor M via a joint 04 so as to be removable.
3, a paper feed table 05 with a pair of rollers 06 attached to each side end, and one end fixed to a winding shaft 03,
A winding belt 07 whose other end is fixed to a paper feed tray 05
and a guide roller 09 that guides the belt 07.
and a pair of rollers 06 on both sides of the paper feed table 05
The horizontal maintenance wire 08 is engaged with the outer box 02 and has both ends fixed to the outer box 02, and the paper feeding roller 010 is brought into contact with the paper P placed on the paper feeding tray 05. .

In the state shown in FIGS. 1 and 2, the paper feed roller 01
0, when the paper P is sequentially ejected, the paper feed tray 0
Although the height of the paper above 5 decreases, the winding shaft 03 is rotated by the motor M by the amount of the decrease, and the paper feed tray 05 is raised via the winding belt 07. Note that the paper feed table 05 has a horizontal maintenance wire 0.
8, the horizontal posture is maintained at all times.

When replenishing the paper feeder 01 with paper, the paper feeder 01 is pulled out in the direction of the arrow in FIG. However, due to the mechanism, the paper feed tray 05 must be placed in the lowered position at the time of withdrawal, so the motor M is reversed in advance to lower the paper feed tray 05, and then the paper feed device 01 is pulled out.

In such a device configuration, while the paper feed tray 05 is rising,
In order to prevent the paper feeder 01 from being pulled out,
A locking mechanism must be provided, which increases the complexity of the device.

In addition, the waiting time for the paper feed tray 05 to come down becomes so-called wasted time, and the work efficiency decreases.

The present invention has been achieved by solving the problems of the prior art, and its purpose is to provide a paper feed device that can be pulled out at any time regardless of the position of the paper feed tray. It is in the point of providing.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

A paper feed device 1 disposed inside the main body of the copying machine includes an outer box 2 serving as a paper storage case, a paper feed table 8 disposed vertically movably within the outer box 2, and a rotating outer box 2. The main body includes a winding shaft 3 which is freely pivoted and rotated by a motor M as a first rotating shaft.

Therefore, a one-way clutch 4 is attached to the winding shaft 3.
A worm wheel 4 which is a first gear and has a built-in worm wheel 4 is attached, and the winding shaft 3 is connected to a rotor shaft of a motor M through a joint 5 so as to be removable.

Further, both ends of a winding belt 10, which is a pair of connecting members, are fixed to a paper feed table 8 having a pair of guide rollers 9 on each side and a winding shaft 3, and the belt 10 is rotatably pivoted on the shaft 6. It is designed to be guided by supported guide rollers 7. Both ends of the horizontal maintaining wire 11 that engages with each pair of guide rollers 9 are fixed to the outer box 2 in the same way as the wire 8 in FIG. 1.

That is, the paper feed tray 8 is suspended horizontally within the outer box 2 by the take-up belt 10 and the horizontal maintenance wire 11.

On the other hand, a worm shaft 21, which is a second rotating shaft, is pivoted to a pivot bracket 20 attached to the outer surface of the outer box 2, and a worm gear 22, which is a second gear, has a one-way clutch 22a built into the rotating shaft 21. A pinion 23, which is a rotating body, is pivotally mounted. The worm gear 22 is meshed with the worm wheel 4 on the winding shaft 3, and the pinion 23 is
It is engaged with a rack 24 which is an engaging member fixed to the fuselage frame F.

Note that a one-way clutch 4 is built into the worm wheel 4 and the worm gear 22.
a, 22a indicate that when the winding shaft 3 is rotated in the direction of arrow A, which is the rotation direction of the motor M, and when the pinion 23 is rotated in the direction of arrow D, the worm wheel 4 and the worm gear 22 are not rotated. It is configured as follows.

In the above configuration, when the copying machine is in operation with paper loaded in the outer box 2, the take-up belt 10 is wound around the take-up shaft 3 by the rotation of the motor M.
As a result, the paper feed tray 8 is raised and the upper surface of the paper is pressed against the paper feed roller R with a predetermined pressure.

Then, as the paper is ejected by the rotation of the paper feed roller R, the height of the paper on the paper feed tray 8 decreases, but this decrease is due to the rise of the paper feed tray 8. be compensated.

When the paper in the outer box 2 runs out and you want to replenish the paper, pull the paper feeder 1 in the direction of the arrow X along a predetermined guide, the joint 5 will be released, and at the same time the pinion 23 will engage the rack 24. starts rotating in the direction of arrow C. The rotation of the pinion 23 is transmitted to the winding shaft 3 via the worm shaft 21, the worm gear 22 incorporating the one-way clutch 22a, and the worm wheel 4 also incorporating the one-way clutch 4a, so that the winding shaft 3 moves in the direction of arrow B. rotated to As a result, the winding belt 10 is unwound,
The paper feed table 8 descends. As the paper feeder 1 is pulled out, the paper feed tray 8 continues to descend, and when it is completely pulled out of the machine, the paper feed tray 8 completes its descent.

Note that the relationship between the drawer length of the paper feeder 1 and the amount of descent of the paper feed table 8 can be arbitrarily selected depending on the meshing ratio between the worm gear 22 and the worm wheel 4.

After replenishing the paper feeder 1 that has been pulled out in this way, when inserting the paper feeder 1 into the machine (in the direction of arrow Y), the pinion 23 is rotated in the direction of arrow D, but each one-way clutch 22a , 4a, the rotation is not transmitted to the winding shaft 3. Therefore, during insertion, the paper feed tray 8 remains stationary at the lower limit position.

When the paper feeder 1 is inserted into the machine, the joint 5 is connected. In this manner, the winding shaft 3 is rotated by the rotation of the motor M, and the paper feed table 8 is raised. At this time, since the worm wheel 4 is pivotally connected to the winding shaft 3 via a one-way clutch, the rotation of the winding shaft 3 is not transmitted to the worm gear 22 side.

As is clear from the above description of the embodiments, in the present invention, the paper feed tray is configured to descend as the paper feed device is pulled out, so there is no waiting time when replenishing paper, and work efficiency is improved. will improve. Moreover, by employing such a configuration, a mechanism for locking the paper feeder when the paper feed tray is in the raised position can be omitted.

Furthermore, with the above configuration, when drawing out the paper feeding device, there is no need to reverse the motor in advance to lower the paper feeding tray, and an inexpensive general-purpose motor can be used, and at the same time, the control circuit can be simplified. .

Furthermore, when the paper feeding device is inserted into the machine again while it is being pulled out, the paper feeding tray starts rising from the position halfway down, which is advantageous because the rising time is shortened.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a known paper feeding device, and FIG.
1, FIG. 3 is a plan view of a sheet feeding device according to an embodiment of the present invention, and FIG. 4 is an explanatory view of the main parts thereof. 1... Paper feeding device, 2... Outer box, 3... Winding shaft, 4...
Worm wheel, 4a...One-way clutch, 5...
Joint, 6...axis, 7...guide roller, 8...paper feed stand,
9... Guide roller, 10... Winding belt, 20...
Pivot bracket, 21... Worm shaft, 22... Worm gear, 22a... One-way clutch, 23... Pinion, 24... Rack, F... Body frame, M... Motor, P... Paper, R... Paper feed roller.

Claims (1)

[Scope of Claims] 1. In a paper feeding device that raises a paper feeding table 8 and feeds paper by a paper feeding roller R, there is provided a paper storage case 2 in which the paper feeding table 8 is arranged.
and a drive source M that is pivotally supported by the paper storage case 2.
a first rotating shaft 3 that can be rotated by the paper feed tray 8; a connecting member 10 that connects the paper feed tray 8 and the first rotation shaft 3 and raises and lowers the paper feed tray 8; a second rotary shaft 21, which is pivotally connected to the first and second rotary shafts 3 and 21 via one-way clutches 4a and 22a, respectively;
and a first gear 4 and a second gear 2 that mesh with each other.
2, and a rotating body 23 that is pivotally connected to the second rotating shaft 21 and engages with an engaging member 24 disposed on the machine body frame F side, when the paper storage case 2 is pulled out of the machine. When the paper storage case is inserted into the machine, the rotating body 23 is rotated, and its rotational force is transmitted to the first rotation shaft 3 to lower the paper feed table 8, and when the paper storage case is inserted into the machine. , wherein the one-way clutches 4a and 22a are arranged so that the rotation of the second rotating shaft 21 is not transmitted to the first rotating shaft 3 and the paper feeding table 8 is in a stationary state. paper equipment.