JPH082806A - Swing fin control method - Google Patents

Abstract

PURPOSE:To eliminate a problem regarding the unavailability of a stable paper sheet folding function due to the swing angle of a swing fin being conventionally constant for any sheet length. CONSTITUTION:The angle of rotation of a motor 30 is directly converted to the oscillating motion of a swing fin 35, and the swing angle of the fin 35 is changed, depending on paper sheet length, thereby eliminating a problem regarding the unavailability of a stable sheet folding function.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing fin control method in which a continuous perforated sheet discharged to a stacker is swung so as to be folded in accordance with the perforations, and more specifically, it has a stable folding performance. The present invention relates to a method for controlling a swing fin.

[0002]

2. Description of the Related Art FIG. 7 is a schematic diagram of a heat fixing type laser beam printer.

When a signal for starting the printing operation is sent from the controller for controlling the laser beam printer, the photosensitive member 1 starts to rotate.

The photosensitive member 1 rotates at a speed corresponding to the printing speed of the laser beam printer, and continues to rotate until the printing operation is completed.

When the photosensitive member 1 starts to rotate, a high voltage of + is applied to the charger 2 to uniformly charge the surface of the photosensitive member 1 with a positive electric charge.

The polygon mirror 3 is a polyhedral reflecting mirror, which starts rotating immediately after power is supplied to the printer, and rotates at a high precision constant speed as long as the power is supplied, and outputs from the laser tube 4. The laser light is reflected by the polygon mirror 3, passes through the FTH lens 5, and is irradiated while scanning the photoconductor 1.

When the character or graphic data converted into a dot image is sent as a laser beam ON / OFF signal from the controller to the laser beam printer, the surface of the photosensitive member 1 may or may not be irradiated with laser light.

When the electric charge on the photosensitive member 1 disappears due to the irradiation of the laser beam and the portion reaches the front of the developing device 6, the toner charged in + is attracted by the static electricity and a toner image is formed on the photosensitive member 1. To be done.

At the timing when the head of the print data formed on the photosensitive member 1 by the laser light comes in front of the transfer device 7,
The tractors 8A and 8B are arranged so that the head (sheet folding perforation) of the sheet 13 on which the data is printed comes in front of the transfer device 7.
Is driven.

The paper 13 in the hopper is composed of tractors 8A and 8A.
It is conveyed to the fixing section through the developing section including the photoconductor 1, the developing unit 6, and the transfer unit 7 via B.

The paper 13 reaching the fixing device 9 is preheated by a preheating plate 10.
After being preheated by (1), the toner image is melted and fixed on the paper 13 by being conveyed while being pressurized and heated by the heat roll 11 and the pressure roll 12.

The printed sheets 13 are separated by the swinging motion of the swing fins 14 according to the folding perforations, and then stacked on the stacker table 16 while the folded state is adjusted by the rotating paddle 15.

FIG. 8 shows a conventional swing fin unit.

A connecting rod 20 is fixed to a pulley 19 to which the rotational force of the servomotor 17 is transmitted via a timing belt 18, and the connecting rod 20 and the swing shaft 24 are connected by a drive arm 21. There is.

The two sets of swing shaft 24 and swing fin 14 of the swing fin unit are connected by an end arm 22 and a connecting plate 23.

That is, the rotational movement of the pulley 19 by the rotational force of the servo motor 17 is converted into the swinging movement of the swing fin 14 by the connecting rod 20.

A conventional swing fin control will be described with reference to FIGS. 9 and 10.

As shown in FIG. 9, the swing fin control system includes a microcomputer section 27 including a microcomputer, ROM, RAM and the like, and a servo motor control section 2.
8, an amplifier unit 29, and a servomotor 17.

Since the details of each of them are general servo motor control systems, their explanations are omitted.

First, the swing fin 14 is shown in FIG.
It is assumed that the vehicle is in the position of state A shown in.

When the print data is output from the controller, the paper feeding operation of the printer is started, the P--FEED-P signal shown in FIG. 10A is turned ON, and when this signal is output, the microcomputer unit 27 More SWIN
The G DRV-P signal is output to the servo motor control unit 28, and the servo motor 17 starts rotating.

Then, the rotational movement of the servo motor 17 is converted into the swing movement of the swing fin 14 via the pulley 19 and the connecting rod 20.

The position of the state B shown in FIG. 10C is the turning point of the swing fin 14, and at this time, the paper feeding of the printer is made so that the positional relationship between the paper folding perforation and the tip of the swing fin 14 is always constant. The control speed of the servomotor 17 with respect to the speed is determined.

The position of the state C shown in FIG. 10D is the swing fin 1 when one page of paper is fed from the state A.
4 position, and the position of the state D shown in FIG.
This is the other turning point of the swing fin 14.

When the paper is fed by two pages, the swing fin 14 returns to the position of the state E shown in FIG. 10B, that is, returns to the same position as the initial state (state A).

According to the conventional swing fin unit,
The swing angle of the swing fin 14 is determined by the configuration of the pulley 19, the connecting rod 20, and the drive arm 21.

Therefore, even the paper 13 to be folded
The swing angle remains constant even when the paper length of is changed.

By the way, when the swing angle is constant, the paper length is Linch and the printing speed (paper feed speed) is Vinc.
If the speed reduction ratio of the servo motor 17 and the pulley 19 is 1: 2 for h / sec, one rotation of the pulley 19 causes 2 links.
The rotation speed of the servomotor 17 is 60 V / L rpm because it corresponds to the operation amount when the paper is fed.

Therefore, it is necessary to control the rotation speed of the servo motor 17 to be increased when the length of the paper 13 to be folded is short, and to decrease the rotation speed of the servo motor 17 when the length is long.

[0030]

The conventional swing fin control is performed as described above, but in the prior art, the sheet 1 to be folded is to be folded due to its structural limitation.
Since the swing angle of the swing fin 14 remains constant regardless of the sheet length of No. 3, as shown in FIG.
The swing fin 14 is swung too much with respect to a sheet having a short sheet length, and as shown in FIG. 11B, the swing fin 14 is not enough with respect to a sheet having a long sheet length. It is not possible to secure stable folding performance.

In order to deal with this problem, the rotation speed of the servomotor 17 is changed according to the paper length (for example, the shorter the paper length, the longer the time required for one reciprocation of the swing fin). Therefore, the required number of rotations of the motor to be used also becomes large), which inevitably requires a large and expensive motor to obtain the required torque and operating speed, and the control circuit is complicated. Become.

Further, conventionally, even if the folding perforation of the sheet 13 and the operation phase of the swing fin 14 are deviated during the operation, it cannot be corrected and there is a problem that the phase deviation is accumulated.

A first object of the present invention is to provide a stable paper for all paper lengths despite the use of a small and inexpensive motor which has a substantially constant rotation speed and a relatively simple control circuit. To ensure folding performance.

A second object of the present invention is, in addition to the above-mentioned first object, further a temporal phase shift of the swing fin with respect to the paper feeding, that is, a folding perforation of the paper and an operation phase of the swing fin. The purpose is to correct the deviation of the phase deviation and eliminate the accumulation of the phase deviation.

[0035]

SUMMARY OF THE INVENTION A first object of the present invention is to:
The swing fin includes a reference position detection unit that detects a reference position of the swinging motion of the swing fin, a control unit that controls the swinging motion of the swing fin, and a paper length detection unit that detects the folding length of the paper. This is achieved by directly converting the rotation angle of the drive motor into the swing motion of the swing fin and changing the swing motion angle of the swing fin according to the folding length of the paper.

In addition to the first requirement, a second object of the present invention is to detect the synchronization deviation between the paper folding perforation and the swing fin by the swing fin reference position detecting means, and to detect the synchronization deviation. It is achieved by correcting.

[0037]

According to the first aspect of the invention, the swing fin is swung at a swing angle according to the length of the sheet.

Further, according to the second aspect of the invention, the phase shift with respect to the paper feeding operation is corrected by knowing the position of the swing fin.

[0039]

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows a swing fin unit used in the method of the present invention.

The rotation of the stepping motor 30 is decelerated by the gear head 31, and is passed through the timing belt 32.
It is transmitted to the pulley 33 fixed to the swing fin shaft 34.

A swing fin 35 is fixed to the swing fin shaft 34.

That is, in the present swing fin unit, in order to swing the swing fin 35, the stepping motor 30 may be switched and rotated in the CW / CCW direction.

Therefore, the swing angle of the swing fin 35 can be freely selected by controlling the number of operation steps of the stepping motor 30.

An encoder plate 37 is fixed to the swing fin shaft 34, and the photo interrupter 3
The position of the swing fin 35 is detected based on the positional relationship with the position 6.

In this embodiment, the swing fin 35 is used.
The position facing downward is the basic position (hereinafter referred to as the home position).

Here, the control of the swing fin unit will be described with reference to FIGS. 2 to 6 while referring to FIG.

As shown in FIG. 3, as a signal inside the printer, a signal P--FEED--indicating that the paper feed is being executed in synchronization with the DVS-P signal generated at a cycle corresponding to the time for feeding the 1/6 inch paper. When P rises, a signal SWING DRV-P for operating the stepping motor 30 is sent from the microcomputer unit 38 to the stepping motor control unit 39. It should be noted that this signal rises in synchronization with the DVS-P signal input first after P FEED-P rises. In this example, the swing fin 35 moves from the home position to CCW.
A timing chart when moving in the direction is shown.

In order to move the stepping motor 30 in the CCW direction, the CW-P signal is output from the microcomputer section 38 at "L" level.

The microcomputer also increments a counter for counting the number of steps each time the stepping motor 30 is operated by one step.

As shown in FIG. 4, if the turning point on the CCW side is n, CCW is reached until the counter value reaches n.
Swing fin 35 moves toward the side, and SWING DRV-
P becomes "L" and the swing fin 35 stops.

Next, when TURN-P is input, CW-P becomes "H" to move the swing fin 35 in the CW direction.

After the TURN-P signal is input, the swing fin drive is restarted at the first DVS-P input.

The TURN-P signal is output at a paper feed time interval corresponding to the paper length of the paper to be printed, and its output timing is set so that the swing fin 35 should reach the turning point. Is managed by counting.

In the process in which the swing fin 35 moves in the CW direction, the encoder plate 37 and the photo interrupter 3
Signal HOME from home position sensor consisting of 6
-P changes from "L" to "H", and with this as a trigger, the counter is forcibly corrected to 2n.

Thereafter, the movement of the swing fins 35 is controlled in the same manner and the swing fin 35 is turned back at the point of the counter 3n, and when HOME-P changes from "H" to "L", the counter is forcibly rewritten to 0. .

If the swing fin 35 is in operation at the time when the TURN-P signal is received, the operation immediately stops and waits for the next DVS-P.

When P FEED-P falls and the paper feeding operation is completed, S is received at the next DVS-P signal input.
WING DRV-P is lowered, swing fin 35
To stop.

As described above, the swing fin 35 is cleared by clearing the counter upon detection of the home position.
It is possible to correct the temporal phase shift of the swing fin 35 with respect to the paper feed by correcting the position information of No. 1 and determining the folding back timing by the TURN-P signal.

FIG. 6 is a flow of swing fin control.

When the paper feed is started, the process 43 is a process 4
Branch to 4.

In process 44, the operation mode of the swing fin 35 is determined.

Since the level is 0 at the beginning, processing 4
Go to step 5 and wait for DVS-P to be input.

When the DVS-P signal is input, the process proceeds to step 46, the level is set to 1 and the process returns to step 44.

Next, in process 47, SWIN D
RV-P becomes “H”, and the operation of the swing fin 35 starts.

In process 48, the level is set to 2, and the process returns to process 44.

The microcomputer increments the counter by 1 each time the stepping motor 30 is advanced by one step, monitors the count value n or 3n in the process 49, and confirms that either value is reached. When it is detected, it is known that the swing fin 35 has reached the turning point, and the level is set to 3 in the process 51 to move to the stop operation.

When a turn signal is detected before reaching the turnaround point, the processing shifts from 53 to 54 and the level is set to 4.

In process 55, the swing fin stop process is performed, and the swing fin 35 stops.

Further, the level is set to 0, the operation direction of the swing fin is switched, the process returns to step 45 to wait for the input of DVS-P, and waits for the next operation timing of the swing fin 35.

When the paper feeding operation is completed, the process proceeds to 57.

When DVS-P is received in the process 58, the swing fin 35 is stopped, the swing fin operation mode is set to 0, and the next sheet feeding is started.

With the control as described above, the value of the turnaround point n is provided for each sheet length, so that the sheet length can be adjusted according to the sheet length, as shown by the symbols θ ₁ and θ ₂ in FIGS. The swing angle can be selected.

Further, since the swing angle is small for a sheet having a short sheet length and large for a sheet having a long sheet length, the rotation speed of the stepping motor 30 is almost constant, so that a small and inexpensive motor can be adopted. became.

Further, by incorporating the phase correction control, it is possible to obtain stable paper folding performance.

[0076]

As described above, according to the present invention, the rotation angle of the swing fin driving motor is directly converted into the swing motion of the swing fin, and the swing motion angle of the swing fin is adjusted according to the folding length of the sheet. By changing the swing fin with a swing angle according to the paper length, the rotation speed is almost constant and the control circuit is relatively simple. It is possible to secure stable paper folding performance.

In addition to the above, the swing fin reference position detecting means further detects the synchronization deviation between the sheet folding perforation and the swing fin, and corrects the synchronization deviation, thereby making it possible to know the position of the swing fin. It is possible to correct the temporal phase shift of the swing fin with respect to the feeding operation, that is, the shift between the folding perforation of the sheet and the operating phase of the swing fin, and eliminate the accumulated phase shift.

[Brief description of drawings]

FIG. 1 is a perspective view of a swing fin unit used in the method of the present invention.

FIG. 2 is a block diagram of a swing fin control unit when carrying out the method of the present invention.

FIG. 3 is a timing chart of the swing fin control unit when the method of the present invention is carried out.

FIG. 4 is a conceptual diagram of a swing fin swing angle when the method of the present invention is performed.

FIG. 5 is a conceptual diagram of a swing angle of a swing fin when the method of the present invention is carried out.

FIG. 6 is a control flowchart of a swing fin when the method of the present invention is carried out.

FIG. 7 is a schematic diagram of a thermal fixing type laser beam printer.

FIG. 8 is a perspective view of a conventional swing fin unit.

FIG. 9 is a block diagram of a swing fin control unit that has been conventionally used.

FIG. 10 is a schematic diagram of swing fin control that is conventionally performed.

FIG. 11 is a swing angle conceptual diagram of a swing fin that has been conventionally used.

[Explanation of symbols]

14 ... Swing fin, 17 ... Servo motor, 22 ... End arm, 23 ... Connecting plate, 30 ... Stepping motor, 32 ... Timing belt, 34 ... Swing fin shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Ishikawa 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Kazuo Uno 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd.

Claims (2)

[Claims] 1. A swing fin for swinging a continuous perforated sheet discharged to a stacker according to a sheet discharging speed and a folding perforation direction, and a motor as a power source for swing fin swinging operation. A reference position detecting means for detecting a reference position of swing motion of the swing fin, and a control means for controlling swing motion of the swing fin,
And a paper length detection means for detecting the folding length of the paper,
A swing fin control method characterized in that a swing motion angle of the swing fin is changed according to a folding length of a sheet. 2. The swing fin control method according to claim 1, wherein the swing fin reference position detecting means detects a synchronization deviation between the sheet folding perforation and the swing fin and corrects the synchronization deviation.