JPS62201736A - Document feed mechanism - Google Patents

Abstract

PURPOSE:To select the optimum paper feeding condition to a document and to stabilize paper feeding operation by providing means for varying pressure between a paper feed roller and a separating portion and means for varying the paper feed speed. CONSTITUTION:A paper feed position detecting means 4 for a document 1 is provided at a mechanism portion within a designated range in the direction of arrows Y, Y'. A paper feed roller support frame 23 and a separation roller belt support frame 35 are fixed through springs 22, 34 to designated places of a pressure plate 72 adapted to move parallel in the direction of the arrows Y, Y' by drive of a pressure varying mechanism 71. Accordingly, the document is placed at the optimum position in a hopper mechanism 11, and simultaneously pressure between a paper feed roller 21 and a separation belt 32 and the rotating speed of the paper feed roller 21 are adjusted by a pressure control circuit and a paper feed speed control circuit. Thus, the optimum paper feed condition to the document to be handled can be set to enable stable paper feeding.

Description

Detailed Description of the Invention [Summary] In a paper feeding mechanism composed of a hopper mechanism, a paper feeding roller, a gate for preventing double-sheet feeding, and a separating section, the paper feeding position is determined by a storage means for paper feeding conditions and the information. and a means for controlling the positional relationship between the gate and the gate, a means for varying the pressure between the paper feed roller and the separating section, and a means for varying the paper feed speed. Stable paper feeding is possible by selecting operating conditions.

[Industrial application field]

The present invention relates to an optical reading device.

In particular, a form feeding mechanism is required that optimizes the paper feeding position, paper feeding roller pressure, separating section pressure, and paper feeding speed depending on the paper quality, type, size, etc. of the processed forms.

[Conventional technology]

As shown in FIG. 3, the currently widely used form feeding mechanism has a gate 12 at a predetermined location on a mechanism frame (not shown), and a gate 12 at a predetermined location. The second sensors 51 and 52 are fixed, a pair of feed rollers 6 are mounted on the axis, and the form 1 is placed at a predetermined position on the side opposite to the solid line arrow of the gate 12, up and down, that is, dotted line arrow y.
A hopper mechanism 11 that moves in the -y' direction is provided, and a lever 23 placed at a predetermined position in the dotted arrow Y direction holds a paper feed roller 21 via a one-way rotating clutch and a form 1 with a constant pressure. Attach the paper feeding pressure spring 22 to press,
A paper feed roller unit 2 equipped with a drive motor (not shown) that feeds out the form 1 and a paper feed position detection means 4 that detects the paper feed position of the form 1 in the direction of the dotted arrow Y-Y' are placed at predetermined positions. A separation plate 31 is placed at a predetermined position on the solid line arrow direction side of the gate 12, and a belt support frame 35 is attached to the frame via a separation pressure spring 34 on the dotted line arrow Y direction side.
Separation rollers 33 are hung horizontally at regular intervals, and a belt 32 is stretched between them to feed the form 1 in the direction of the solid line arrow, and at the same time, a separating section 3 is arranged to separate the two-sheet feed of the form 1. The mechanism and the hopper mechanism 11 are moved in the direction of the dotted arrow Y-Y' so that the topmost part of the superimposed form l is always held at a predetermined paper feeding position by the paper feeding position detection means 4, and the paper feeding roller 21 and the separation roller 33 is rotated in the direction of the arrow to feed the form 1 in the direction of the solid arrow, and the paper feed roller 21 and the separation roller 33 are stopped by the detection signal of the first sensor 51 until it reaches a predetermined position on the friction plate 31. The belt 32 is rotated again in the direction of the arrow under constant pressure in response to a signal from a reading unit (not shown), and the friction between the separating plate 31 and the form 1 separates two or more sheets from being fed. It consists of a control section 8' that causes one sheet of the document l to be caught by the feed roller 6 and feeds out the next document l in response to a passing signal from the second sensor 52.

[Problem that the invention seeks to solve]

The problem with the conventional form feeding mechanism explained above is on the hopper mechanism! ! Since the sheet feeding position of the placed form in the direction of the dotted arrow y-y' is a constant position, the height difference with the tip of the gate fixed to the mechanism frame is also constant. In addition, the pressure of the paper feed roller to press the form and the pressure of the belt that presses against the separation plate are constant pressure due to the paper feed pressure spring and the separation pressure spring, and the rotation speed of the paper feed roller is also constant, so the speed is If the amount of paper is thick (stiff), slippage may occur between the paper feed roller and the paper due to the height difference with the gate, resulting in paper feeding errors and paper feeding delays.

In addition, forms made by cutting continuous paper along perforations or forms with adhesive between sheets may be fed out without being separated one by one by the paper feed roller or separation unit, resulting in two-sheet feeding. This is a factor that hinders the improvement of the operating rate of the paper mechanism.

The present invention provides a form feeding mechanism that can easily control the paper feeding position, paper feeding roller pressure 2 separation part pressure, and paper feeding speed according to the paper quality, speed, size, etc. of the forms to be processed. The purpose of this study is to provide a control method for this purpose.

[Means for solving problems]

The above problem is solved by using a frame (not shown) as shown in Figure 1.
The gate 123, the separating plate 31, the first .
The second sensors 51, 52, the feed roller 6, and the hopper mechanism 11 are provided at predetermined locations in the direction of the dotted arrow Y, and a variable pressure mechanism 71 is applied to the mechanism that moves a predetermined distance in parallel in the direction of the dotted arrow Y-Y'. A pressure plate 72 is provided, and a paper feed roller 21 and a paper feed pressure spring 22 are provided at predetermined locations on the pressure plate 72, and a belt is attached to the paper feed roller part 2 that feeds out the form 1, and two separation rollers 33 mounted on an axis. 32 and the separation pressure spring 34
A separating section 3 having a separator 3 is attached to the drive motor 24, and then the top of the form 1 placed on the hopper mechanism 11 is detected within a predetermined range in the direction of the dotted arrow Y-Y'. The position detection means 4 is arranged at a predetermined location on the side opposite to the solid line arrow, and the paper feeding mechanism section is manufactured.

As shown in FIG. 2, the gate 1 is
2 and the paper feed position, and a comparator 82 that compares the output of the paper feed position detection means 4 with the data in the storage part 81. A hopper mechanism control circuit 85 that controls the hopper mechanism 11 and sets the sheet feeding position, a pressure control circuit 84 that controls the pressure of the sheet feeding roller section 2 and the separating section 3, and further the sheet feeding roller 21.
A new mechanism control section 8 is constructed by adding a paper feed roller speed control circuit 83 for controlling the rotational speed of the paper feed roller speed control circuit 83 to the conventional mechanism control section, and paper feed position detection means 4. of the paper feed mechanism section is constructed. This problem is solved by the form feeding mechanism and its control method of the present invention, which are respectively coupled to the hopper mechanism 11, the variable pressure mechanism 71, and the driving motor 24 of the feeding roller 21.

[Effect]

That is, in the present invention, the positional relationship between the paper feeding position and the gate 12 depending on the type of the form 1, and the positional relationship and the paper feeding roller 2
19 The optimal positional relationship of the form 1 recorded in the storage unit 81 by inputting the type of the form 1 to be processed to the control unit 8 before processing using the correlation between the pressure of the separation unit 3 and the paper feeding speed. The output from the paper feed position detection means 4 and the output from the storage section 81 are compared, and the hopper mechanism control circuit 85 moves the hopper mechanism 11 in the direction of the dotted arrow y-y' to find the optimal positional relationship. At the same time, the pressure control circuit 8
4 and the paper feed roller speed control circuit 83
By adjusting the pressure of the belt 32 in the separating section and the rotational speed of the paper feed roller 21, the optimum paper feeding conditions for the form to be processed can be set and stable paper feeding becomes possible.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a side sectional view of the form feeding mechanism according to this embodiment.

As shown in the figure, gate 12. Separator plate 3 with a predetermined friction coefficient
1. 1st. The second sensor 51, 52, the feed roller 6, and the hopper mechanism 11 are installed at the same location as in the conventional mechanism, and the paper feed position detects the paper feed position of the form 1 within a predetermined range in the direction of the dotted arrow y-y''. Detection means 4 For example, a light receiving element and a light emitting element having a predetermined length and width are arranged at a predetermined location on the side opposite to the solid arrow.

Next, a pressure variable machine tI71 is attached to a frame (not shown), and the pressure plate 72, which is driven by the pressure variable machine tI71 and moves in parallel in the direction of the dotted arrow Y-Y', is attached to a predetermined location of an aluminum alloy plate having a predetermined shape and size. A paper feed roller support frame 23 that supports a paper feed roller 21 that feeds the paper feed roller 21 in the direction of the solid line arrow;
A belt support frame 35 in which a belt 32 is stretched around a book separation roller 33, for example, a frame made of aluminum alloy casting finished to a predetermined size, is used as a paper feed pressure spring 22 and a separation pressure spring 34, both having a specified wire diameter. The piano wire is wound into a coil and attached via a spring having a predetermined elastic force.
A driving motor 24 for the paper feed roller 21, for example, a DC motor and a driving motor (not shown) for driving the belt 32.
A unit is manufactured in which each of the components is mounted, and is assembled at a predetermined position in the upper part of the mechanism section, that is, in the direction of the dotted arrow Y.

Next, as shown in FIG.
M, the output level of the paper feed position detection means 4, and the storage section 8.
1, and a hopper mechanism control circuit 85 that controls the hopper mechanism 11 and sets the positional relationship between the sheet feeding position and the gate 12 based on the output voltage of the comparator 82. A pressure control circuit 84 that controls the pressure variable mechanism 71 for adjusting the pressure between the paper feed roller 21 and the belt 32, and a paper feed roller speed control circuit 83 that further controls the rotational speed of the paper feed roller 21 are replaced with conventional ones. A new mechanism control section 8 added to the mechanism control section is constructed, and the sheet feeding position detecting means 4 of the sheet feeding mechanism section is constructed. The hopper mechanism 11 is coupled to the variable pressure mechanism 71 and the drive motor 24, respectively.

Then, when the type of form 1 to be processed is input to the control unit 8 before processing and activated, the storage unit 81 outputs the voltage at the optimal sheet feeding position of the form 1 to the comparator 82; is a built-in operational amplifier circuit that outputs a voltage of 1 or more or on the negative side compared to the output voltage of the paper feeding position detecting means 4, and the output voltage is O, that is, the optimum paper feeding position with respect to the gate 12. The hopper mechanism control circuit 85 moves the hopper mechanism, and the pressure control circuit 84 and paper feed roller speed control section 83 adjust the pressure of the paper feed roller 21 and the belt 32 of the separating section, and rotate the paper feed roller 21. By controlling the speed, you can set the optimal paper feeding conditions for forms.

〔Effect of the invention〕

As explained above, according to the present invention, the optimal conditions corresponding to the type of form can be automatically selected and set with an extremely simple configuration, thereby eliminating paper feeding errors, double sheet feeding, etc., and significantly improving the operating rate of the device. It is expected to have economical effects and is extremely useful industrially.

[Brief explanation of drawings]

FIG. 1 is a side view showing a form feeding mechanism according to an embodiment of the present invention, FIG. 2 is a control circuit block diagram of this embodiment, and FIG. 3 is a side view showing a conventional form feeding mechanism. , 1 is a form, 11 is a hopper mechanism, 12 is a gate, 2 is a paper feed roller section, 21 is a paper feed roller, 22 is a paper feed pressure spring, 23 is a paper feed roller support frame, 23゛ is a lever, 24 is a A drive motor, 3 is a separation unit, 31 is a separation plate, 32 is a belt, 33 is a separation roller, 34 is a spring for separation pressure, 35 is a belt support frame, 4.4° is a paper feed position detection means, 51 is a first 1 sensor, 52 is a second sensor, 6 is a feed roller, 71 is a pressure variable mechanism, 72 is a pressure plate, 8.8 is a control section, 81 is a storage section, 82 is a comparator, 83 is a paper feed roller speed control 84 is a pressure control circuit, and 85 is a hopper mechanism control circuit. 111 m fs2 diagram Figure 3

Claims (1)

[Claims] A hopper mechanism (11) that moves the form (1) up and down in a superimposed manner;
It consists of a paper feed roller (21) that sequentially feeds sheets starting from the form (1) at the top, a gate (12) that prevents feeding of two sheets of the fed form (1), and a separating section (3). The paper feeding mechanism includes a paper feeding position detection means (4) for detecting the position of the form (1) within a predetermined range, and the separation section (3).
a variable pressure mechanism (71) that changes the pressure of the paper feed roller (21);
4), and further includes a storage means (8) for storing the paper feeding conditions of the form (1).
1), and a comparator (82) that compares the output of the sheet feeding position detection means (4) with the data of the storage section (81) and outputs the result, and the output determines the sheet feeding position and the sheet feeding position. A hopper mechanism control circuit (
85), a pressure control circuit (84) for controlling the pressure variable mechanism (71), and a control section (8) having a paper feed roller speed control circuit (83). paper mechanism.