JPH01313229A - Driving method for paper sheet separating mechanism - Google Patents

Abstract

PURPOSE:To satisfactorily separate paper sheets in spite of strong frictional force between respective paper sheets by reversely driving a reverse rotating roller after passing of the front end of a paper sheet through a normal rotation roller. CONSTITUTION:A sending back force with a reverse rotation roller 11 at start of rotation is stronger than that at rotating condition. By utilization of this fact at first a normal rotation roller 10 is driven and the reverse rotation roller 11 is driven after passing of the front end of a paper sheet between both rollers 10, 11, sop as to delay the drive timing of the reverse rotation roller 11. Hereby the strong sending back force of the reverse rotation roller 11 at starting rotation actuates on paper sheets PP, and on and after the second paper sheets PP fed together with the first one with the normal rotation roller 10 are sent back.

Description

[Detailed description of the invention] [Table of contents] a. Important industrial fields of application. Prior art (Fig. 5). Means for solving the problem to be solved by the invention (Fig. 1). ) Description of one embodiment (Figs. 2, 3, and 4) Function) Description of other embodiments Effects of the invention [Summary] Driving of the reversing roller in a paper separation mechanism using a normal rotation roller and a reversal roller Regarding the method, the purpose is to provide a method for driving a paper separation mechanism that can effectively separate the paper sheets even when the frictional force between the paper sheets is large. It has a reversing roller which is placed opposite to the normal rotation port and is driven by an MJE rotation roller and a reverse rotation axis, and the paper fed by the +E rotation roller is sent back by the reversing roller to separate the paper. In the paper separation mechanism, the normal rotation roller is driven to rotate in the normal direction, and after the leading edge of the paper passes through the yielding and forward rotation rollers, the reversing roller is driven in the reverse direction.

[Industrial application field]

The present invention relates to a method for driving a reversing roller in a paper separation mechanism using a forward rotating roller and a reversing roller.

For example, in a printer that uses cut sheets, it is necessary to feed sheets one by one from sheets stacked in a hopper.

For this reason, a paper separation mechanism is used that separates and feeds paper from a group of papers stacked in a hopper.

In recent years, there has been a demand for high-speed paper feeding, and there is a need for paper separation technology that does not cause double feeding (simultaneous feeding of multiple sheets) even when feeding at high speed.

[Conventional technology] FIG. 5 is an explanatory diagram of the prior art.

The paper PP accumulated in the hopper 2 is picked up by the pick roller 12.
Although sheets are fed one by one, the second and subsequent sheets may be fed due to electrostatic force or frictional force between the sheets PP.

A paper separation mechanism is used to send back and feed the second and subsequent sheets of paper that have been fed at the same time one by one.

As shown in FIG. 5(A), the paper separation mechanism includes a forward rotation (feed) roller 10 that rotates in the same direction as the pick roller 12, and a feed roller 10 that is sunk in a position opposite to the forward rotation (feed) roller 10 and rotates in the opposite direction. A roller configured with a reversing roller 11 is often used.

In this paper separation mechanism, the first sheet of paper on the hopper 2 is
The pick roller 12 and the normal rotation roller 10 feed the paper to the left in the figure, and the reversing roller 11 sends the second and subsequent sheets sent together with the first paper back to the hopper 2, thereby separating the paper. be.

Conventionally, such a paper separation mechanism drives the pick roller 12 and simultaneously drives the normal rotation roller 10 and the reversal roller 11, as shown in FIG. 5(B).

[Problem to be solved by the invention]

By the way, when the paper PP is fed at high speed, the frictional force between the paper P1) tends to become large.

For this reason, as in the conventional case, the normal rotation roller 10 and the reverse rotation port = U1
1, when the reversing roller 11 is rotating and there is a weak reaction force, a plurality of sheets of paper PP will be driven by the normal rotating roller 10.
If it gets between the roller and the reversing roller 11, the problem shown in FIG.
As shown in C), a double feed occurs, and the reaction force of the rotating reversing roller 11 causes a situation in which the second and subsequent sheets cannot be fed back, creating a problem in which it becomes difficult to properly separate the sheets. .

Therefore, an object of the present invention is to provide a method for driving a paper separation mechanism that can effectively separate paper sheets even when the frictional force between the paper sheets is large.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In the present invention, in a paper spine nI device using a normal rotation roller 10 and a reversal roller 11, as shown in FIG. , the reversing roller 11 is driven in the reverse direction as shown in FIG. 1(B).

[Effect]

In the present invention, the reversing roller 11 takes advantage of the fact that the return force by the reversing roller 11 is stronger at the start of rotation than during rotation.
1 is delayed, the normal rotation roller 10 is rotated, and the reversing roller 11 is driven after the leading edge of the paper passes between both rollers 1O111.

As a result, a strong return force is applied to the paper at the time when the rotation of the reversing roller 11 starts, and the second and subsequent papers sent together by the normal rotation roller 10 are sent back.

Therefore 1. Even if the frictional force between the sheets is caused by a person, the second and subsequent sheets can be reliably sent back, and the separation of the sheets can be ensured.

〔Example〕

(a) Description of one embodiment FIG. 2 is a configuration diagram of an embodiment of the present invention.

In the figure, the same parts as shown in FIGS. 1 and 5 are indicated by the same symbols, 13 is an intermediate roller for conveying separated sheets, and 30 is a sensor. , a device that detects the paper being conveyed and outputs a detection signal PS; 31 is a main motor that serves as a power source; 3
2 is a clutch, which turns on/off transmission of power from the main motor 31 to the reversing roller 11 in response to a clutch control signal C33; 33 is a torque limiter, which is provided between the reversing roller 11 and the clutch 32; It is.

34 is a clutch that turns on/off transmission of the power of the main motor 31 to the forward rotation roller IO in response to a clutch control signal C82; 35 is a clutch that transmits the power of the main motor 31 to the pick roller in response to a clutch control signal C3I; This is to turn on/off the transmission to 12.

36 is a pick roller magnet, which moves the pick roller 12 up and down based on the magnet control signal FSZ, and
4 is a control unit that makes contact with and separates from P, and 4 is a control unit that outputs a clutch control signal C in a predetermined sequence according to a feed command.
3l-C33, which outputs the mat//-i control signal FS.

This fruit h&! In the example, iE rolling roller 10 and reversing roller 1
Clutches 32.1 and 32.1 are driven at different timings.
34 are provided separately.

FIG. 3 is a time chart diagram of one embodiment of the present invention, and FIG. 4 is an explanatory diagram of the operation of one embodiment of the present invention.

The control unit 4 turns on the main motor 31 using the motor control signal MS, and rotates the motor 3I.

When the feed command arrives, the control section 4 turns on the magnet control signal FS and the clutch control signals C3I and C52, drives the magnet 36, lowers the pick roller 12 to contact the tPP, and clutches the normal rotation roller 10. 34, the pick roller 12 is rotationally driven by a clutch 35.

Therefore, as shown in FIG. 4(A), the iPP on the hopper 2
The pick roller 12 starts feeding the paper, and the leading edge of the paper advances toward the normal rotation roller 10.

At this time, if the frictional force between the sheets is large, as shown in Figure 4 (13)
As shown in FIG. 4(C), the second and subsequent sheets of paper are fed together, and the forward rotation roller 10 causes a plurality of sheets of paper to enter between the forward rotation roller 10 and the reversal roller 11, as shown in FIG. 4(C). .

Since the reversing roller 11 is provided with a torque limiter 33, even if a plurality of sheets of paper enter between the rollers 1O111, they will be carried along as the sheets are fed, and no jam will occur.

In this way, the control unit 4 turns on the clutch control signal C33 after a period of time when the leading edge of the paper has come out of the normal rotation roller 10 by 2 to 3 cm from the start of driving of the normal rotation roller 10.

As a result, the reversing roller 11 is reversely rotated by the clutch 32 as shown in FIG. 4(D).

Since the force applied to the paper when the reverse rotation of the reversing roller 11 starts is strong, the paper P receives a strong return force when the reverse rotation starts, and this causes a strong force to be applied to the second and subsequent sheets of paper that are fed by frictional force. A sending force works.

Therefore, the second and subsequent sheets can be reliably sent back to the front of the reversing roller 11.

The magnet control signal FS and the clutch control signal CSt are turned off after a certain period of time L1, and the pick roller 12 stops rotating and separates from the paper PP.

On the other hand, when the sensor 30 detects the trailing edge of the paper PP, the control unit 4 turns off the clutch control signals C32 and C83.
With the clutches 32 and 34 turned off, the normal rotation roller 1
0 and the reversing roller 11 are stopped, and the feeding operation of one sheet of paper is completed.

In the embodiment shown in FIG. 2, by simply providing one extra clutch and changing the driving timing of the forward roller 10 and the reverse roller 11, sheets can be reliably fed one by one.

(b) Description of other embodiments In the embodiments described above, the reversing roller is driven after a predetermined period of time has elapsed after the normal rotation roller starts driving. The reversing roller may be driven by detecting that the leading edge of the paper has passed by the rolling roller; in other words, the reversing roller may be driven after the paper is fed in the normal rotation row.

Furthermore, although the paper feed section of a printer has been described as an example, the present invention may be used in a paper feed section of other devices, and the paper is not limited to paper, and may be made of film or the like.

Although the present invention has been described above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, by changing the drive timing of the forward rotation roller and the reversal roller, even if the frictional force between the sheets is large, it is possible to reliably feed one sheet at a time. This allows jams and double feeds to be prevented as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a configuration diagram of an embodiment of the invention, Fig. 3 is a time chart diagram of an embodiment of the invention, and Fig. 4 is an explanatory diagram of the operation of an embodiment of the invention. , FIG. 5 is an explanatory diagram of the prior art. In the figure, 10-forward rotation roller, IL--reverse roller, 12-pick roller, 2-hopper, PP--paper.

Claims (1)

[Claims] (1) Normally rotating roller (10
), and a reversing roller (11) that is disposed opposite to the normal rotation roller (10) and is driven to rotate in the opposite direction to the normal rotation roller (10), and is fed by the normal rotation roller (10). In the paper separation mechanism that separates the paper by sending back the paper by the reversing roller (11), the normal rotation roller (10) is driven to rotate in the normal direction, and after the leading edge of the paper passes through the normal rotation roller (10), The reversing roller (11)
A method for driving a paper separation mechanism, characterized in that the paper separation mechanism is driven in reverse.