JPS641300Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention This invention relates to a device that automatically supplies sheet-like paper to an input/output device of an information processing system.

(2) Background of the technology With the wide spread of information processing devices, various sizes and paper types of paper have come to be used as information carriers. There is a demand for all processing to be performed by a device, and there is also a strong demand for lower cost and simpler operation of the device. Therefore, there is a growing demand for an automatic paper feeder for feeding these papers that can handle a variety of papers, has good operability, and is inexpensive.

(3) Prior art and problems The automatic paper feeder for sheet paper is designed to feed paper stacked on a hopper board using the frictional driving force of a pick roller, and there is a separation claw that locks the paper. Alternatively, the sheets are separated one by one by a balance between the resistance force of an elastic pad or the like and the driving force. Therefore, in order to reliably separate and feed the paper, it is necessary to set the contact force between the pick roller and the paper (hereinafter referred to as "pick pressure") according to the smoothness and stiffness of the paper.
The balance between the pick pressures of the left and right pick rollers must be maintained accurately and constant, and the contact position of the pick rollers must also be changed depending on the size of the paper.

FIGS. 1 and 2 show a conventional automatic paper feeder for sheet paper. What is shown in FIG. 1 is paper 5 stacked on a hopper plate 2 by the biasing force of a spring 4 interposed between a hopper plate 2 pivotally connected to a fulcrum shaft 1 and a stationary member 3. is brought into contact with a pick roller 6 provided at a fixed position, and by using a spring 4 having a spring constant corresponding to the weight per unit thickness of paper 5, the stacked weight of paper can be changed. The pick pressure is maintained almost constant even when the paper is used, and its structure is simple and can be provided at low cost. However, it is difficult to adjust the pick pressure according to the size and quality of the paper. , is effective only when paper size and paper quality are limited.

The system shown in Fig. 2 is adopted when a wide variety of paper types are used, and has a structure in which the hopper plate 2 is raised and lowered by a rack and pinion mechanism to bring the pick roller 6 and the paper 5 into contact. It is something. The one shown in the second figure has a structure that controls the pick pressure by controlling the rotation angle of the pulse motor that drives the pinion 7, and can handle various types of paper. In order to maintain the balance of the pick pressure of the pick crawler, it is necessary to make the hopper plate 2, its guide, and lifting device sufficiently rigid, and the amount of lifting and lowering of the hopper plate 2 must be accurately and finely controlled. The drawback is that it is necessary and the equipment is expensive. Furthermore, even with the structure shown in the second figure, it is not always easy to accurately set the pick pressure depending on the type of paper. In addition, the first
8 in the figure and FIG. 2 is a paper separation claw, and the second
Reference numeral 9 in the figure is a rack that is fixed to the hopper plate 2 and meshes with the pinion 7.

(4) Purpose of the invention This invention was made to solve the problems of the conventional device mentioned above. The purpose of this invention is to provide an automatic paper feeding device that is extremely easy to set, and that also accurately maintains the balance between the set pick pressure and the pick pressure of the left and right pick rollers, and that has a simple structure and can be provided at low cost. be.

(5) Structure of the invention The automatic sheet paper feeding device of this invention is an automatic sheet paper feeding device that feeds sheets stacked on a hopper board one by one by the frictional driving force of a pick roller. , has a paper position detection sensor placed on the contact plane between the pick roller and the paper, and has a hopper board divided into left and right parts, at least one of which is slidably pivoted to a fulcrum shaft, and is directed upward. An elevating member is provided which is biased by the elevating member, and an ammunition is interposed between the elevating member and each divided hopper plate, and the elevating member is configured to be raised and lowered by a pulse motor. The pick pressure is set by applying a set number of pulses to the pulse motor after the paper detection signal is output from the sensor.

(6) Embodiment of the invention Figures 3 and 4 show the first embodiment of this invention. In the figure, 1 is the fulcrum shaft, 2
1 is a hopper board, 4 is a spring, 5 is paper, 6 is a pick roller, and 8 is a paper separation claw. 10 is fulcrum pin 1
Reference numeral 1 indicates a paper detection lever pivotally supported on a stationary member (not shown), and reference numeral 12 indicates a limit switch that detects the operation of the lever 10. When the paper 5 moves up to a position where it contacts the pick roller 6, the limit switch 12 is turned on. It is designed to detect the position of the paper. The hopper board 2 is divided into left and right parts, each of which is pivotally attached to the fulcrum shaft 1.
At least one of them is slidably attached to the fulcrum shaft 1 so that the position can be set according to the size of the paper 5. Needless to say, at least one of the pick roller 6 and the separating claw 8 is provided movably so that the position can be set according to the size of the paper 5.

13 is a spring receiving plate, and this spring receiving plate 13 is
It is provided on each of the divided hopper plates 2 which are pivoted on the fulcrum shaft 1, and the hopper plate 2 is pivoted on the fulcrum shaft 1.
When sliding on the hopper plate 2, this spring receiving plate 13 also slides together with the hopper plate 2. The spring 4 is installed between the hopper plate 2 and the spring receiving plate 13. Reference numeral 14 denotes a rotation shaft supported by a stationary member (not shown) parallel to the fulcrum shaft 1, and is driven by a pulse motor 17 via gears 15 and 16. An arm 18 is fixed to both ends of the rotation shaft 14.
An elevating girder 19 is installed between 8 and 18, and this elevating girder 19 is in contact with the back surface of the spring receiving plate 13. 2
Reference numeral 0 designates a drive circuit for the pulse motor 17. This drive circuit 20 is supplied with the setting signal of the pick pressure setting device 21 and the paper detection signal from the limit switch 12. When the detection signal is applied, a number of pulses corresponding to the set value of the setting device 21 are then applied to the pulse motor 17, and then the pulse motor 17 is stopped.

Next, the operation of the paper feeding device of this first embodiment will be explained. Paper 5 is stacked on the hopper board 2 with the hopper board 2, pick roller 6, and separation claw 8 adjusted to the width of the paper. At this time, the spring 4 is bent in accordance with the weight of the paper 5, and a gap exists between the upper surface of the paper 5 and the pick roller 6. Next, when the pulse motor 17 is rotated to move the elevator girder 19 upward, the hopper board 2 and the paper 5 move upward. When the top surface of the paper 5 comes into contact with the pick roller 6, the limit switch 12 issues a paper detection signal.
Thereafter, the pulse motor 17 continues to rotate for a number of pulses corresponding to the set value set according to the size and quality of the paper 5, and then stops. As a result, the spring 4 is displaced by a predetermined amount, and the paper 5 and the pick roller 6 are brought into contact with each other with a set pick pressure.
This pick pressure is applied when the limit switch 12
Since it is determined by the number of pulses given to the pulse motor 17 after detecting the amount of paper 5, it is constant regardless of the amount of paper 5, and the spring constant of the left and right springs 4 is the same and the amount of displacement thereof is also the same. Therefore, the pick pressures of the left and right pick rollers 6 are also equalized. After the pick roller 6 rotates and feeds out one sheet of paper 5, a certain number of downward pulses are applied to the pulse motor 17 to move the hopper board 2 downward, separating the paper 5 from the pick roller 6 and releasing the feed load. By repeating the operation of moving the hopper plate 2 upward again, the sheets 5 are automatically fed one by one.

The second embodiment shown in FIG. 5 is an automatic paper feeder of the present invention constructed with a simpler structure.
A leaf spring 22 is used as a spring to press the paper against the pick roller 6, and this leaf spring 22 itself serves as an elevating member. It's summery. That is, using a square shaft as the fulcrum shaft 1a,
A leaf spring 22 is fixedly attached to a sleeve 23 fitted onto the square shaft 1a, and the hopper plate 2 is pivotally connected to the sleeve 23, and the leaf spring 23 is attached to the back side of the hopper plate 2.
the tip of the fulcrum shaft 1 with the pulse motor 17.
By rotating a, the leaf spring 22 is rotated, and the hopper plate 2 is raised and lowered. The second embodiment has a simple structure and can be manufactured at low cost, but due to wear of the sleeve 23 and error in the spring constant of the leaf spring 22, the pick pressure is lower than that of the first embodiment. Non-uniformity is more likely to occur.

(7) Effect of the invention As stated in the explanation of the operation of the first embodiment above,
According to the automatic paper feeder of the present invention, the pick pressure can be easily set to the optimal value according to the size and paper quality of the paper being used, and the set pick pressure is accurate regardless of the increase or decrease in the amount of paper. will be maintained. In addition, since the hopper board is divided into left and right parts and one of them is movable, it can be used for various paper sizes, and if the springs that bias each of the divided hopper boards are manufactured accurately, this can be achieved. As a result, the balance between the left and right pick pressures is maintained, so there is no need to make the hopper plate or other members strong, and the device can be manufactured at low cost.

[Brief explanation of the drawing]

1 and 2 are side views illustrating a conventional automatic paper feeder, FIGS. 3 and 4 are views showing a first embodiment of this invention, and FIG. 5 is a view showing a second embodiment. FIG. 3 is a side view, and FIGS. 4 and 5 are perspective views with the paper detection sensor omitted. In the figure, 1 and 1a are fulcrum shafts, 2 is a hopper plate, 4 is a spring, 5 is paper, 6 is a pick roller, 8 is a paper separation claw, 10 is a paper detection lever, 12 is a limit switch, 13 is a spring receiving plate, 14 is the rotation axis, 17
is a pulse motor, 18 is an arm, 19 is a lifting girder,
20 is a pulse motor drive circuit, 21 is a pick pressure setting device, 22 is a leaf spring, and 23 is a sleeve.

Claims (1)

[Scope of utility model registration request] In an automatic sheet paper feeder that feeds sheets stacked on a hopper board one by one using the frictional driving force of a pick crawler, a paper position detection sensor placed on the contact plane between the pick crawler and the paper is used. The hopper is divided into left and right parts, and at least one of them is provided with an elevating member that urges upward a hopper that is slidably pivoted to a fulcrum shaft. A bullet is interposed between the hopper board and the elevating member is configured to be raised and lowered by a pulse motor, and after a paper detection signal is output from the sensor, a set number of pulses are emitted. An automatic paper feeding device for sheet paper, characterized in that an elastic force between the paper and the pick roller is set by applying it to the pulse motor.