JPS63235221A - Paper feeding device of copying machine - Google Patents

Abstract

PURPOSE:To prevent the paper clogging due to the warp of a paper sheet by suspending the rise of a loading plate and setting the paper sheet into horizontal state by vertically moving the right and left edges of the paper sheet by moving the flat plates at the right and left edge parts of the loading plate by driving a correcting device, when the uppermost paper sheet on the loading plate is warped. CONSTITUTION:Paper sheets 1 are loaded onto a loading plate 2, which is raised by a transfer device. When the uppermost paper sheet 1 on the loading plate 2 is in warped state, drive of the transfer device is suspended by a controller according to the output signal of a position detector 8. Since the edge part switch 48 of the position detector 8 is still in OFF state the motor of a correcting device is normally driven, and the flat plates 6a and 6b at the right and left edge parts of the loading plate 2 are moved upwardly. Then, the right and left edge parts of the paper sheet 1 are moved upwardly, and the uppermost paper sheet is set horizontal at a paper feeding level. Therefore, the paper clogging due to the warp of the paper sheet can be prevented.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to a copier PIi that stocks and feeds a large amount of paper.
6. (Including Shredder) <Prior Art> In a conventional paper feeding device of a copying machine, a loading plate on which sheets are loaded is composed of a single flat plate. Therefore, even if the amount of curl (amount of warpage) of each sheet of paper is very small, when the amount of paper becomes large (for example, 20'00 sheets), the amount of curl is amplified, and the center and edges of the topmost sheet of paper are There is a height difference between the two. Therefore, paper feeding becomes unstable and paper jams are likely to occur.

Problems to be Solved by the Invention In order to prevent paper jams caused by curled paper in the paper feeding device of the above copying machine, (a) use uncurled paper; (b)
Possible methods include changing the stacking direction of paper and (c) limiting the amount of paper stacked. However, all of these operations are performed by the user at the stage of use, and there is a problem in that the user's hands are forced to do so.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a paper feed device for a copying machine that can automatically and reliably prevent paper jams due to paper warping without requiring any intervention from the user.

<Means for Solving the Problems> The means for solving the problems according to the present invention includes a mounting plate 2 on which paper 1 can be placed and which can be raised and lowered, and a mounting plate 2 that is connected to a paper feed roller 3 above the mounting plate 2. A moving device 4 is provided for vertically moving the mounting plate 2, and the mounting plate 2 has a first flat plate 6a and a second flat plate 6b, which are movable up and down with respect to the center portion 2a of the mounting plate 2, at both ends thereof. is provided, a sheet upper end surface leveling device 7 is provided for vertically moving each of the flat plates 6a and 6b, and a position detecting device 8 is provided for detecting the warp height of the uppermost sheet of the sheet 1, A control device 11 is provided to control the correction device 7 based on the output signal of the position detection device 8.

<Operation> In the problem solving means described above, when the user places the paper 1 on the mounting plate 2 and raises the mounting plate 2 using the moving device 4, the uppermost paper 1 on the mounting plate 2 moves to the third position. If it is warped in a convex shape as shown in the figure, the control device 11 stops driving the lifting motor 32 of the moving device 4 based on the output signal of the position detecting device 8. At this time, since the end switch 48 of the position detection device 8 is still in the OFF state, the motor 25 of the correction device M7 is driven forward, and the flat plates 6a and 6b at both left and right ends of the mounting plate 2 are moved upward. Therefore, both the left and right ends of the paper 1 move upward, and the uppermost paper 1 becomes horizontal at the paper feed level.Then, when the copy switch 51 is turned on, the paper feed motor 39
Paper can be fed smoothly even when the paper is driven. In addition, if the paper 1 is warped in a concave shape as shown in Figure 4, both ends of the loading plate 2 are moved down in the opposite direction to the above, and the uppermost paper 1 is made horizontal, so that smooth paper feeding can be achieved. I can do it.

As described above, even if the user unconsciously places the paper 1 on the placement plate 2, the topmost paper 1 is automatically leveled, so the user is forced to move when replenishing the paper 1. This allows for stable paper feeding.

<Embodiment> Hereinafter, an embodiment of a paper feeding device of a copying machine according to the present invention will be described based on FIGS. 1 to 6. FIG. 1 is a side view of a paper feeding device of a copying machine showing an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a state in which the center height detector detects the top sheet of paper. FIG. 4 is a front view showing a state in which the edge height detector detects the topmost paper, and FIG.
This figure is a control block diagram, and FIG. 6 is a control flowchart.

As shown in the figure, the paper feeding device of the present invention includes a mounting plate 2 on which a large amount of paper 1 can be placed and which can be raised and lowered, and the mounting plate 2 is moved up and down in the direction of a paper feeding roller 3 above the mounting plate 2. A moving device 4 for moving the vehicle is provided.

The mounting plate 2 has a first flat plate 6a and a second flat plate 6b at both ends thereof, which rotate around a common horizontal axis 5 extending in the front-rear direction so as to move up and down with respect to the center of the mounting plate 2. A sheet upper end surface leveling device 7 for vertically moving each of the flat plates 6a and 6b about the horizontal axis 5 is provided.

A position detection device 8 is provided for detecting the warp height of the uppermost sheet of paper 1.

The position detection device 8 includes a center height detector 9 that detects the height position of the middle direction of the uppermost sheet 1, and an edge height detector 10 that detects the height position of the edge of the sheet 1. It consists of

A control device 11 is provided which controls the drive of the correction device 7 and the moving device 4 based on the output signal of the position detection device 8.

Further, as shown in FIGS. 1 and 2, the mounting plate 2 is disposed at the upper end of the box 12 which is open at the top, and the center portion 2a of the mounting plate 2 is supported by the box 12 via the horizontal axis 5. A storage box 14 is constructed from the box body 12 and the mounting plate 2. A paper presence/absence detection switch 15 for detecting the presence or absence of paper 1 is fixed on the back surface of the placement plate 2, and an actuator 15a of the switch 15 protrudes from the surface of the placement plate 2. The storage box 14 is housed in a lower part of a paper feeding space 17 formed at the rear of the copying machine main body 16. The paper feeding space 17 is located at the bottom plate 1 of the main body 16.
8, a top plate 19, left and right side plates 20, a front plate 22 that prevents the paper 1 from moving forward, and a rear tray cover 24 that can be opened and closed via a hinge 23.

The straightening devices 7 for each of the flat plates 6a and 6b are arranged on both the left and right sides of the storage box 14, and are connected to a motor 25 fixed to the bottom plate of the box body 12, as shown in FIGS. a pinion 26 rotated by a drive shaft 25a;
A rack 27 is meshed with the pinion 26 and guided so as to be movable in the front and back direction, and a rack 27 is swingably supported on the side plate 12a of the box body 12 via a support shaft 28 parallel to the drive shaft 25a of the motor 25. It is composed of a pair of front and rear flat plate lift levers 29. As shown in FIGS. 1 and 2, the lifting lever 29
The upper end 29a contacts the back surface of the mounting plate 2, and a long hole 30 is formed at the lower end of the lift lever 29, and the front and rear end shafts 31 of the rack 27 are movably fitted into the long hole 30. There is.

As shown in FIG. 1, the moving device 4 includes a lifting motor 32 disposed in front of the front plate 22 and a space 17 for feeding paper.
a lifting pulley 33 rotatably supported by the side plate 20 of the main body 16 at the upper part of the storage box 14, a belt hook 34 formed on the side plate 12a of the storage box 14, and a pulley whose one end is on the motor shaft side of the lifting motor 32. 35 and a lifting belt 36 whose other end passes through a lifting pulley 33 and is fixed to a belt hook 34.

Further, a paper feeding section 37 is disposed above the paper feeding space to feed the paper 1 from the uppermost one to the image forming section. A motor fixing box 38 fixed to the upper end of the motor fixing box 3
a paper feed motor 39 built into the paper feed motor 8; a pinion 40 externally fitted and fixed to the motor shaft of the paper feed motor 39;
A pinion 41 is rotatably supported by the motor fixing box 38 and meshes with the pinion 40, a pulley 42 is arranged in parallel with the pinion 41, and a pinion 41 is rotatably supported by the fixing box 38 via a roller shaft 43. It is composed of a pair of left and right paper feed rollers 3, a pulley 44 fixed to a roller shaft 43 of the paper feed roller 3, and a transmission belt 45 wound around the pulley 44 and the pulley 42. There is.

The center height detector 9 and the end height detector 10 of the position detection device 8 are arranged in the fixed box 38 between the pair of left and right paper feed rollers 3, and the center height detector 9 is It is composed of a center height switch 46 and a first actuator 47 having a letter-shaped shape when viewed from the front for turning on and off the movable contact of the center height switch 46.

The edge height detector 10 includes an edge height switch 48;
and a second actuator 49 shaped like a letter when viewed from the front for turning on and off the movable contact of the end height switch 48.

The lower end surface 47 of the first and second actuators 47.49
a and 49g are arranged at the same level and are arranged below the paper feed roller 3. and the lower end surfaces 47a of the first and second actuators 47°49,
When the paper feed roller 49a is moved upward to the lower end of the outer periphery of the paper feed roller 3, the switches 46 and 48 are turned on.

Up and down guide plates 22a and 22b are provided in front of the paper feed roller 3.
A paper feed guide path 22c is formed by this.

The control device 11 is a general one-chip microcomputer with internal program ROM, data RAM, and A.
It has an LU, etc., and is driven by a reference clock oscillator. As shown in FIG. 5, the paper presence detection switch 15 and the tray cover 24 are provided on the input side of the control device 11.
An opening/closing detection switch 50 that detects opening/closing of the main body 16, a copy switch 51 provided on the operating section of the main body 16, and the center height switch 46 and end height switch 48 are connected. The motor 2 is connected to the output side of the control device 11.
5, the respective driving parts of the lifting motor 32 and the paper feeding motor 39 are connected.

The control device 11 has a function of stopping the moving device 4 in response to an arrival signal from the center height detector 9 or the end height detector 10, and a function of stopping the moving device 4 by the arrival signal from the center height detector 9 or the edge height detector 10, and by stopping the top sheet 1 by the output signals of both detectors 9 and 10. A function of outputting a drive signal to the straightening device 7 so that the paper is level, a function of stopping the lifting motor 32 in response to a paper out signal from the paper presence/absence detection switch 15, and a function of stopping the lifting motor 32 in response to an open signal of the opening/closing detection switch 50. It has a function of outputting a placing plate lowering signal and a function of outputting a paper feed signal to the paper feed motor 39 in response to a copy signal from the copy switch 51.

The operation from installation of the vc1 to paper feeding in the above configuration will be explained based on chart 70 in FIG. 6.

When the paper 1 that has been placed on the mounting plate 2 until now is fed and runs out, the user replenishes the paper 1 himself. At this time, the placing plate 2 has been moved up to the highest position, and when the user opens the tray cover 24 in this state, the opening/closing detection switch 50 outputs a placing plate lowering signal to the lifting motor 32, and Lower the placing plate 2 to the lowest position.

Note that this operation may be performed by providing a mounting plate lowering switch on the work panel and turning it on. At least, the lifting motor 32 should stop when there is no paper.

Next, when the user places the paper 1 on the placing plate 2, a placing plate raising signal is output to the elevating motor 32.

At this time, for example, if the top sheet of paper 1 on the loading plate 2 is warped in a convex shape as shown in FIG. Switch 46 is turned on. The control device 11 stops driving the lifting motor 32 based on this signal. At this time, since the end switch 48 is still in the OFF state, the motor 25 is driven forward, and the flat plates 6a and 6b at both left and right ends of the mounting plate 2 are moved upward about the horizontal axis 5. Therefore, both the left and right ends of the paper 1 move upward, and the end height switch 48 is turned on. This signal causes the control device 11 to stop the motor 25. At this time, since both the center height switch 46 and the edge height switch 48 are in the ON state, the topmost paper 1 becomes horizontal at the paper feeding level, and the paper feeding motor 39 is then driven by turning on the hubbie switch 51. Paper can be fed smoothly even when

On the other hand, if the sheet 1 is warped in a concave shape as shown in FIG. 4 when the loading plate 2 is moved upward, the second actuator 49 is pushed up and the end height is raised before the center height switch 46 is turned on. The switch 48 is turned on. Therefore, the control device 11
Stop 2. Then, the center height switch 46 is set to ○FF.
Due to the condition, the motor 25 is driven in reverse to move both left and right ends of the mounting plate 2 downward about the horizontal axis 5. Along with this, both the left and right ends of the paper move downward, and the uppermost paper 1 becomes horizontal, allowing smooth paper feeding. It is also possible that both the center height switch 46 and the end height switch 48 are turned off when both ends of the mounting plate 2 move downward, but in this case, raise the mounting plate 2 slightly again. If so, both the center height switch 46 and the end height switch 48 are ONL, and the mounting plate 2 is stopped at the paper feeding level.

From the beginning, center height switch 46, end height switch 48
If it turns on, this means that the top sheet 1 is already horizontal, so there is no problem.

As described above, even if the user unconsciously places the paper 1 on the placement plate 2, the topmost paper 1 is automatically leveled, so the user is forced to move when replenishing the paper 1. This allows for stable paper feeding.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, in the above embodiment, the mounting plate 2 is divided into two parts, but the division is not limited to two parts, and it is sufficient that both ends can move up and down with respect to at least the center part. Therefore, each flat plate of the mounting plate 2 is not limited to a type that rotates around a horizontal axis as in the above embodiment, but may be a type that simply moves up and down. Further, the moving device 4, the correction device 7, and the position detecting device 8 are not limited to the above embodiments.

<Effects of the Invention> As is clear from the above description, according to the present invention, when a user places a sheet of paper on a loading plate and raises the loading plate using a moving device, the topmost sheet of paper on the loading plate is lifted. If it is warped,
Based on the output signal from the position detection device, the control device stops driving the lifting motor of the moving device, drives the straightening device, and moves the flat plates on both the left and right ends of the loading plate up and down, thereby moving the left and right ends of the paper up and down. As a result, the uppermost sheet of paper is horizontal at the sheet feeding level, and the user does not have to worry about replenishing sheets, which has the excellent effect of stabilizing sheet feeding.

[Brief Description of the Drawings] Fig. 1 is a side view of a paper feeding device of a copying machine showing an embodiment of the present invention, Fig. 2 is a front view thereof, and Fig. 3 is a central height detector located at the top. a front view showing a state in which paper is detected;
FIG. 4 is a front view showing the state in which the edge height detector detects the topmost paper, and FIG. 5 is a control block diagram.
Figure f56 is also a control flowchart. 1: paper, 2: mounting plate, 3: paper feed roller, 4: moving device, 5: horizontal axis, 6a: first flat plate, 6b: second flat plate, 7:
Correction device, 8: Position detection device, 9: Central height detector, i
o: 4 parts height detector, 11: control device, 12: box body, 1
4: Storage box, 16: Copying machine body, 17: Space for paper feed, 2
5: Motor, 26: Pinion, 27: Rack, ゛28
: Support shaft, 29: Elevating lever, 32: Elevating motor, 37
: Paper feed section, 38: Motor fixing box, 39: Paper feed motor, 46: Center height switch, 47: First actuator, 48
: End height switch, 49: Second actuator. 1: On the side buds 2: Mounting ms ”' = 6
a: 6th a: Grass - fist board - 26: Pinion 49: 2nd work Ute Fig. 1 1f Fig. 3 Fig. 4 Fig. 2 Fig. 6 Fig. m5

Claims (1)

[Claims] A loading plate capable of loading paper and movable up and down, and a moving device for moving the loading plate up and down in the direction of the paper feed roller above the loading plate are provided. A first flat plate and a second flat plate are provided which are movable up and down with respect to the central part of the placing plate, and a sheet upper end surface leveling device is provided for vertically moving each of the flat plates. 1. A paper feeding device for a copying machine, comprising: a position detection device for detecting a warp height of an object; and a control device for controlling the straightening device based on an output signal from the position detection device.