JP2671594B2 - Paper feed mechanism - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed mechanism, and more particularly to a paper feed mechanism that controls paper feed by a switch and a timer.

[Conventional technology]

As shown in FIG. 5, the conventional paper feeding mechanism has a conveyance path 1
And a vacuum rotor 2 that sucks up the form 4 and sends it to the conveyance path 1, and a micro switch 3 that detects the position of the form 4.
And a hopper 5 on which the form 4 is placed, a motor 6 for raising and lowering the hopper 5, and a motor drive circuit 7 for controlling the motor 6.

The form 4 placed on the hopper 5 is moved to the micro switch 3 by the motor 6 controlled by the motor drive circuit 7.
Keeps rising until is turned on. When the micro switch 3 is turned on, the motor 6 is stopped and the form 4 is the vacuum rotor 2
Thus, the sheets are sent one by one to the transport path 1. When the form 4 is sequentially sent out and the micro switch 3 is turned off, the motor 6 is restarted and the hopper 5 is further raised until the micro switch 3 is turned on. During this time, the vacuum rotor 2
Continues to operate, and by repeating this control, forms can be continuously conveyed.

FIG. 2 shows an operation time chart at this time. Form 4 is sent out in sequence and micro switch OFF detection position 10
Then, the motor 6 is started. When the form 4 rises to the micro switch ON detection position 11, the motor 6 stops, but due to overrun, the actual stop position at overrun
It will stop at 12, and the amount of position change at this time will be 13.

[Problems to be solved by the invention]

In this conventional paper feed mechanism, the position of the form is detected by a micro switch, and the motor drive is stopped by turning on the micro switch, but due to the inertia of the hopper and the form, the rise does not stop immediately. ,Microswitch
Sometimes the ON position was overrun.

Since the amount of movement due to this overrun is large, there is a problem in that the position change beyond the hysteresis of ON / OFF of the micro switch occurs, and the occurrence rate of double feed and feed unevenness increases.

An object of the present invention is to provide a paper feed mechanism that reduces the occurrence rate of double feed and feed unevenness.

[Means for solving the problem]

In order to achieve the above-mentioned object, a paper feeding mechanism according to the present invention is a paper feeding mechanism that has a hopper, a motor, a micro switch, a timer, and a motor control circuit, and sequentially feeds a form from the hopper. The hopper supports the forms in a stacked state and moves them up and down, the motor moves the hopper up and down, and the micro switch detects the height position of the form delivered from the hopper. The timer measures the lifting time of the hopper, and the motor control circuit sets the initial setting time when the micro switch is turned off when the form on the hopper is fed out, and the initial setting time and the timer timing. The motor raises the hopper until the signals match, and when the signals match, the hopper rise is stopped, and if the microswitch is OFF at that time, Set the start-up set time, the hopper is raised again on the basis of the timer time measurement signal only said time,
If the microswitch is ON when the hopper is stopped, the state of the microswitch is monitored until it is turned OFF.

Further, the restart set time is shorter than the initial set time.

[Action]

After the lapse of the initial setting time, the raising of the hopper is temporarily stopped, the output signal of the micro switch is discriminated, and when the micro switch is OFF, the hopper is raised again to process the insufficient movement of the hopper.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

 FIG. 1 is a configuration diagram showing one embodiment of the present invention.

In the figure, a transport path 1 is laid horizontally, and a hopper 5 is installed so as to be able to move up and down with respect to the carry-in side of the transport path 1.
The hopper 5 supports the forms 4 in a stacked state. When the form 4 on the hopper 5 is lifted to the height position of the vacuum rotor 2, the form 4 is sequentially delivered by the vacuum rotor 2 toward the transport path 1.

Furthermore, the present invention provides a micro switch 3 and a motor 6.
And a motor drive circuit 7 and a timer 8.

The micro switch 3 is located at the rising end of the hopper 5,
The height position of the form on the hopper 5 is detected.

The motor 6 raises and lowers the hopper 5, and the timer 8 counts the raising and lowering time of the hopper 5.

The motor control circuit 7 raises the hopper 5 by the motor 6 and stops the motor 6 after the initial setting time elapses. At that time, the output signal from the micro switch 3 is discriminated. The motor 6 is restarted for the start-up set time to perform the process of compensating for the insufficient movement of the hopper 5.

Further, the restart set time is set shorter than the initial set time (set to 1/2 in the embodiment).

FIG. 3 is an operation time chart, and FIG. 4 is a flow chart. The form 4 is sequentially sent out to the transport path 1 by the vacuum rotor 2, and the form 4 on the hopper 5 is reduced to separate from the micro switch 3 and the micro switch 3 is removed.
When turned off, the motor control circuit 7 performs the processing of timer value setting t ← T31 by the determination of the microswitch determination 30. t is the count number of the timer 8, and T
Is a certain value that has been set. At the time, the motor control circuit 7 starts the motor 6 by a command by the hopper rising start 32, continues to operate the motor 6 for a certain time by the timer (t) 33, and when the count number t of the timer 8 reaches the set value T. Then, the hopper rising stop 34 stops the motor 6 at the stop position 21 controlled by the timer. Even after the motor is stopped, the hopper continues to rise from the micro switch OFF detection position 20 to the overrun stop position 22 due to the inertia of the hopper 5 and the form 4. After the ascent stops, the motor control circuit 7 determines that the micro switch 3 is OF by the micro switch determination 35.
If it is F, half of the first timer value is set by the processing of timer value setting t ← 1 / 2T36, the hopper rise is started again, and the processing for compensating for the insufficient movement is repeated. The total amount of positional change is 23. On the contrary, when the micro switch 3 is ON, the process returns to the process of the micro switch determination 30 and the form becomes small, and the micro switch 3
Do not start motor 6 until is turned off.

The motor control circuit 7 causes the motor 6 to lower the hopper 5 to the original position when all the forms 4 on the hopper 5 have been fed.

〔The invention's effect〕

As described above, in the present invention, the motor control can be stopped also by the ON detection of the micro switch and the timer. Therefore, by optimizing the timer value T, the position change amount of the form can be reduced, This has the effect of reducing the occurrence rate of double feed and feed unevenness.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
A conventional operation time chart, FIG. 3 is an operation time chart of the present invention, FIG. 4 is a flow chart of the present invention, and FIG. 5 is a configuration diagram showing a conventional example. 1 ... Transport path, 2 ... Vacuum rotor 3 ... Micro switch, 4 ... Form, 5 ... Hopper, 6 ... Motor, 7 ... Motor control circuit, 8 ... Timer

Claims (2)

(57) [Claims] 1. A paper feed mechanism having a hopper, a motor, a micro switch, a timer, and a motor control circuit, which sequentially feeds a form from the hopper, the hopper supporting the forms in a stacked state. , A motor for moving the hopper up and down, a micro switch for detecting the height position of the form fed out from the hopper, and a timer for measuring the lift time of the hopper. The motor control circuit sets the initial setting time when the form on the hopper is fed out and the micro switch is turned off, and the motor raises the hopper until the initial setting time and the timing signal of the timer match. , At the time of coincidence, the rise of the hopper is temporarily stopped, and at that time, the micro switch
If it is OFF, set the restart setting time, raise the hopper again based on the timed signal of the timer for that time, and if the micro switch is ON at the time when the hopper is stopped once, turn ON the micro switch until OFF. A paper feeding mechanism characterized by monitoring the state of a switch. 2. The restart setting time is shorter than the initial setting time.
The paper feed mechanism described in the item.