JPH09286530A - Copying machine paper sheet feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve stabilized sheet paper supply by making a mistake in feeding sheet papers hardly occur. SOLUTION: A pickup solenoid 1 makes sucking action during paper sheet supply and supplies paper sheets by means of a pickup roller 2, a feed roller 6 and a reverse roller 7. When the height of paper sheet surface drops and detection sensor 5 makes its detecting action by means of a filler 4, copy paper sheets 3 ascend. When the position of the detection sensor 5 is moved up and down so as to adjust the paper sheet surface weight of a copy paper sheet 3, the paper sheet surface height also increase/decreases by means of the control of a control system. When the position of the detection sensor 5 is adjusted, the position of a stopper 8 arranged on the member 11 same as that for the detection sensor 5 moves up and down in linkage to the change of the paper sheet surface height, so as to maintain interval between the pickup roller 2 and the paper sheet surface at a constant. Similarly, a pickup solenoid 1 arranged on the member 11 same as that for the detection sensor 5 also moves up and down, the solenoid stroke is maintained at a constant and a pickup roller pressurizing spring 9 also makes vertical motion so as to hold the pressurizing force of pickup roller 2 against the copy paper sheet 3 at a constant value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine paper feeding device which is used in a printer or a facsimile machine and which feeds a transfer paper stored in a paper feed tray to an image forming portion to feed the transfer paper.

[0002]

2. Description of the Related Art Conventionally, a printer or a facsimile machine is provided with a copying machine sheet feeding device for feeding a transfer sheet stored in a sheet feeding tray to an image forming section. In this copying machine paper feeding device, the uppermost first sheet of the transfer paper stored in the paper feeding tray is sent out by the pickup roller and the feed roller,
FRP that returns the second and subsequent transfer sheets with a reverse roller
A mechanism is provided.

In this FRP mechanism, it is necessary to hold the paper surface of the transfer paper at a predetermined height. For this reason, a filler is provided in the pickup roller swing lever portion, and a detection sensor for detecting the paper surface height of the transfer paper by the movement of the filler is provided. The height of the paper tray is adjusted by displacing the height of the paper feed tray with the raising motor based on the detection signal from here.

In this case, the detection position of the detection sensor can be adjusted in order to prevent the height of the paper surface from changing due to variations in member accuracy and inertia of the paper feed tray raising motor. If the position of the pickup roller is released when the pickup roller is released, that is, when the pickup roller rises above the sheet surface of the transfer paper, the positional relationship between the pickup roller and the sheet surface changes when the height of the sheet surface of the feed tray changes. Changes and cannot maintain the proper interval.

To solve this problem, if the lift position of the pickup roller when the pickup roller is released is changed, the positional relationship with the pickup roller pressurizing solenoid is changed and the solenoid stroke is changed, so that an appropriate suction force can be obtained. It will be difficult. Furthermore, if the elastic position of the spring that applies the pressure when the pickup roller is pressed is constant, the height of the paper surface of the paper feed tray changes, and the pickup roller pressure changes to obtain an appropriate pressure. Disappear.

[0006]

As described above, in the above-mentioned conventional copying machine paper feeding apparatus, when the height of the paper surface of the paper feed tray changes, the positional relationship between the pickup roller and the paper surface changes. Therefore, it becomes impossible to maintain an appropriate interval. If the lifted position of the pickup roller when releasing the pickup roller is changed to solve this problem, the positional relationship with the pickup roller pressurizing solenoid changes, the solenoid stroke changes, and an appropriate suction force cannot be obtained.

Furthermore, if the elastic position of the spring that applies the pressure when the pickup roller is pressed is constant, the height of the paper surface of the paper feed tray changes, and the pressure of the pickup roller changes, so that the pressure is appropriate. No pressure can be obtained.
In this case, there are drawbacks that feeding failure due to feeding error is likely to occur, the suction force of the solenoid is insufficient, and the pressure applied to the transfer sheet cannot be kept constant, so that stable feeding cannot be performed.

The present invention solves the problems in the prior art as described above. It is unlikely that a paper feed error will not occur, and the suction force of the solenoid will not be insufficient.
An object of the present invention is to provide a copying machine paper feeding device capable of stably feeding paper while maintaining a constant pressure on the transfer paper.

[0009]

In order to achieve the above object, the invention according to claim 1 is a copying machine paper feeding device for feeding a transfer paper stored in a paper feeding tray to an image forming section.
A raising motor that raises the transfer sheet, a pickup solenoid for driving the up and down movement, a pickup roller that moves up and down by the pickup solenoid, a stopper that rises when the pickup roller is released, and the first sheet of the transfer sheet in the forward direction. A transfer roller that feeds out and reverses the second and subsequent sheets of transfer paper, and a detection sensor that detects the height of the paper surface are arranged. When adjusting the paper surface height of the, the height of the detection sensor and the stopper when releasing the pickup roller is changed in conjunction with this paper surface height, and the paper surface height between the pickup roller and the transfer paper is kept constant. Is.

In the paper feeder of the copying machine according to the second aspect, the detection sensor, the stopper, and the pickup solenoid for pressing the pickup roller are arranged on the same member, and when the paper height of the transfer paper in the paper feed tray is adjusted, this paper surface is adjusted. The arrangement position of the pickup solenoid is changed in association with the height, and the solenoid stroke is kept constant when the pickup roller is released to maintain the suction force.

According to a third aspect of the present invention, in the copying machine paper feeding device, the detection sensor, the stopper and the elastic member for pressing the pickup roller are arranged in the same member, and when the paper height of the transfer paper in the paper feeding tray is adjusted, the paper height is adjusted. In conjunction with this, the mounting position of the elastic member for pressing the pickup roller is changed to keep the pressure applied to the transfer paper constant.

In the copying machine paper feeding device of the invention according to the first aspect of the present invention having such a structure, when the paper surface height of the transfer paper in the paper feeding tray is adjusted, for example, when the position of the detection sensor is adjusted. When the paper surface height of the transfer paper in the paper feed tray is changed by the control of, the height of the stopper when the pickup roller is released is changed in association with this paper surface height.
The distance between the pickup roller and the paper surface of the transfer paper is kept constant. As a result, feeding failure due to paper feed is less likely to occur,
Stable paper feeding is performed.

In the paper feeder of the second aspect of the present invention, when adjusting the paper surface height of the transfer paper in the paper feed tray, the arrangement position of the pickup solenoid is changed in association with the paper surface height. That is, the solenoid stroke at the time of releasing the pickup roller can be kept constant, and stable feeding can be performed without insufficient suction force of the pickup solenoid.

In the paper feeder of the third aspect of the present invention, when adjusting the paper surface height of the transfer paper in the paper feed tray, the mounting position of the pickup roller pressing elastic member can be changed in association with the paper surface height. Therefore, the pressure applied to the transfer sheet is kept constant, and stable sheet feeding is performed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a copying machine sheet feeding device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing the configuration of an embodiment of a copying machine paper feeding device of the present invention. In FIG. 1, this example shows a pickup solenoid 1 whose suction and opening are controlled by a control system (not shown).
And a pickup roller 2 for sequentially feeding the transfer paper stored in a paper feed tray (not shown) from the top.

Further, a transfer paper 3 which is housed in a paper feed tray (not shown) and whose paper surface height is increased by the drive of an ascending motor, and a light transmitting / receiving portion of a detection sensor 5 when the transfer paper 3 pushes up the pickup roller 2 ( The filler 4 for blocking the light detection part) and the detection sensor 5 for detecting the blocking by the movement of the filler 4 when the height of the transfer paper 3 stored in the paper feed tray becomes high. have.

Further, the feed roller 6 and the reverse roller 7 for feeding the transfer sheets 3 one by one from the uppermost sheet of the transfer sheet 3 in the paper feed tray and returning the second and subsequent transfer sheets 3 come into contact with each other. Further, it has a stopper 8 for fixing the detection sensor 5 with screws 5a and a pickup roller pressing spring 9 for pressing the pickup roller 2.

Further, it has a member 11 to which the ends of a detection sensor 5, a stopper 8, a pickup solenoid 1 fixed by screws 11a and 11b, and a pickup roller pressing spring 9 are attached. Further, the other end of the pickup roller pressing spring 9 is attached, the pickup roller 2 and the feed roller 6 are rotatably attached, and the filler 4 has a roller attaching member 12 provided at the upper portion in the drawing. .

Further, an interlocking member 13 having an end rotatably mounted and an end of the drive unit 1m of the pickup solenoid 1 mounted at the center to interlock with the roller mounting member 12, and the interlocking member 13 It has a suction spring 14 for pulling up.

Next, the operation of this embodiment will be described. FIG. 2 is a diagram for explaining operations and functions in this embodiment, and FIG. 3 is a diagram for explaining other operations and functions in this embodiment. In FIG.
When feeding the transfer paper 3 stored in a paper feed tray (not shown) to an image forming unit (not shown), the transfer paper 3 in the paper feed tray is driven to be raised by a raising motor (not shown). In this case, the pickup solenoid 1 is in the suction state, and the pickup roller 2 is lowered toward the transfer sheet 3 stored in the sheet feeding tray.

As the transfer paper 3 in the paper feed tray rises, the transfer paper 3 contacts the pickup roller 2 and pushes it up, as shown in FIG. 2, and the filler 4 reaches the light detection portion of the detection sensor 5 and shuts it off. The stop of the detection signal from the detection sensor 5 is taken in by a control system (not shown), and control for stopping the drive of the raising motor (not shown) is performed. Further, the control system releases the operation of the pickup solenoid 1 as shown in FIG.

By this release, the drive section 1m of the pickup solenoid 1 is displaced to the upper part in the figure. Simultaneously with this displacement, the elasticity of the suction spring 14 pulls up the interlocking member 13, and the roller mounting member 12 jumps up together with the pickup roller 2 against the elasticity of the pickup roller pressing spring 9.

In this way, at the time of paper feeding, the pickup solenoid 1 performs a suction operation according to the paper feeding timing under the control of a control system (not shown), and the transfer roller 3 of the paper feeding tray is moved by the pickup roller 2, the feed roller 6 and the reverse roller 7. The sheets are fed one by one from the uppermost sheet to an image forming unit (not shown). By this paper feeding, the paper surface height of the transfer paper 3 in the paper feed tray is gradually lowered, and the filler 4 does not block the light detection portion of the detection sensor 5. In this non-cutoff state, the control of a control system (not shown) controls the raising motor to raise the transfer sheet 3 in the sheet feeding tray.

The transfer paper 3 in the paper feed tray is provided with a mechanism (not shown) capable of moving the position of the detection sensor 5 up and down in order to adjust the paper surface height.
When the position of the detection sensor 5 is raised, a raising motor (not shown) controls to raise the paper feed tray, and the paper surface height of the transfer paper 3 increases. Further, when the position of the detection sensor 5 is lowered, the paper surface height becomes low.

Since the detection sensor 5, the stopper 8 and the pickup solenoid 1 and the pickup roller pressing spring 9 are arranged on the same member 11, the position of the detection sensor 5 is adjusted to move up and down to supply the toner. When the height of the paper surface of the transfer paper 3 in the paper tray is changed, the position of the stopper 8 arranged on the same member 11 as the detection sensor 5 also moves up and down. As a result, the gap between the pickup roller 2 and the surface of the transfer paper 3 in the paper feed tray can be kept constant.

When the position of the detection sensor 5 is adjusted to be moved up and down, the same member 1 as the detection sensor 5 is used.
The pickup solenoid 1 arranged at 1 also moves up and down. As a result, the stroke of the pickup solenoid 1 can be kept constant.

Further, when the position of the detection sensor 5 is adjusted to move up and down, the position of the pickup roller pressing spring 9 arranged on the same member 11 as the detection sensor 5 also moves up and down. Therefore, the pressure applied to the transfer paper 3 by the pickup roller 2 can be kept constant.

[0028]

As is apparent from the above description, according to the copying machine paper feeding device of the invention described in claim 1, when the paper surface height of the transfer paper in the paper feeding tray is adjusted, it is interlocked with this paper surface height. Since the height of the stopper is changed when the pickup roller is released, the gap between the height of the pickup roller and the paper surface of the transfer sheet can be kept constant, and it is possible to prevent feeding errors and prevent stable feeding. Will be done.

According to another aspect of the present invention, there is provided a copying machine paper feeding device.
When adjusting the paper height of the transfer paper in the paper feed tray, the arrangement position of the pickup solenoid is changed in conjunction with this paper height, so the solenoid stroke when the pickup roller is released can be held constant, Stable paper feeding can be performed without insufficient suction force of the pickup solenoid.

According to another aspect of the present invention, there is provided a copying machine paper feeding device.
When adjusting the paper surface height of the transfer paper in the paper feed tray, the mounting position of the pickup roller pressing elastic member can be changed in conjunction with this paper surface height, so that the pressure applied to the transfer paper is kept constant. Stable paper feed will be possible.

[Brief description of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of a copying machine paper feeding device of the present invention.

FIG. 2 is a diagram for explaining an operation and a function in the embodiment.

FIG. 3 is a diagram for explaining another operation and function in the embodiment.

[Explanation of symbols]

 1 Pickup Solenoid 2 Pickup Roller 3 Transfer Paper 4 Filler 5 Detection Sensor 6 Feed Roller 7 Reverse Roller 8 Stopper 9 Pickup Roller Pressing Spring

Claims (3)

[Claims] 1. A copying machine paper feeding device for feeding a transfer paper stored in a paper feed tray to an image forming section, a raising motor for raising the transfer paper, a pickup solenoid for driving up and down movement, A pickup roller that moves up and down by a pickup solenoid, a stopper that rises when the pickup roller is released, a first sheet of the transfer paper that is fed in the forward direction, and
A transfer roller for returning the second and subsequent sheets of the transfer paper, and a detection sensor for detecting the height of the paper surface. The detection sensor and the stopper are arranged on the same member, and the transfer paper of the paper feed tray is provided. When adjusting the paper surface height, the heights of the detection sensor and the stopper at the time of releasing the pickup roller are changed in association with the paper surface height, and the space between the pickup roller and the transfer paper is kept constant. A paper feeder for a copying machine, characterized in that 2. The copying machine paper feeding device according to claim 1, wherein the detection sensor, the stopper, and the pickup solenoid for pressing the pickup roller are arranged in the same member, and the height of the transfer paper in the paper feed tray is adjusted. A paper feeding device for a copying machine, characterized in that the arrangement position of the pickup solenoid is changed in association with the height of the paper surface so that the solenoid stroke when the pickup roller is released is kept constant to hold the suction force. 3. The copying machine paper feeding device according to claim 1, wherein the detection sensor, the stopper and the elastic member for pressing the pickup roller are arranged in the same member, and when the height of the transfer paper in the paper feeding tray is adjusted, A copying machine paper feeding device characterized in that the mounting position of the elastic member for pressing the pickup roller is changed in accordance with the height of the paper surface to keep the pressure applied to the transfer paper constant.