JPS62120997A - Cutter drive - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cutter drive device for driving and controlling two cutters.

2. Description of the Related Art Conventionally, devices using roll paper, such as facsimile machines, printers, and copying machines, are equipped with a cutter for cutting the roll paper into a required length.

As a driving device for driving and controlling such a cutter, for example, there is one in which the cutter is driven by a DC motor.

However, when the cutter is driven by a motor in this way, even if the motor current is turned off (cut off), the motor does not stop rotating due to inertia, so the cutter overruns the stop position and does not stop at the correct stop position. There is this inconvenience.

Therefore, a driver with a brake is generally used as the motor drive circuit for the DC motor, and when the cutter reaches the stop position, the motor current is cut off and the brake is applied to force the motor to stop. .

However, using a driver with a brake as a drive circuit to drive a cutter drive DC motor in this way requires brake on/off control in addition to motor current energization/cutoff control, resulting in a complicated configuration. There is an inconvenience that this happens.

Purpose This invention has been made in view of the above points, and its object is to enable a cutter to be stopped at a correct position with a simple structure.

In order to achieve the above object, the present invention turns on the motor current to the DC motor after the cutter finishes cutting the paper.
The motor current to the DC motor is cut off when the cutter is at the stop position.

Hereinafter, a detailed explanation will be given based on one embodiment of the present invention.

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

The cutter unit 1 has a cutter driven by a DC motor 2, and the cutter operates at a high level, for example, H
For example, a photosensor that outputs a position signal SA that becomes
On the other hand, the motor control circuit 3 includes a cutter position detection sensor made of a microswitch, etc. 6 On the other hand, the motor control circuit 3 controls a motor driver made of a transistor etc. based on the cutter drive instruction and the position signal S^ from the cutter position detection sensor of the cutter unit 1. The control signal C8 is output to the DC motor 2.
to drive and control.

Incidentally, this motor control circuit 3 can be used for example, facsimile,
It is composed of a microcomputer and the like that controls the entire device such as a printer and a copying machine.

Next, the operation of this embodiment configured as described above will be explained with reference to FIGS. 2 and 3.

The motor control circuit 3 starts executing the process shown in FIG. 2 at the cutter drive timing, and first sets the control signal Cs to the motor driver 4 to H'' (motor ON) to start driving the DC motor 2.

Thereafter, the position signal S^ from the cutter position sensor of the cutter unit 1 is checked to determine whether or not the cutter of the cutter unit 1 has reached the paper cutting end position, and the process waits until it reaches the paper cutting end position.

When the cutter of the cutter unit 1 reaches the paper cutting end position, the control signal Cs to the motor driver 4 is set to L' (motor 0FF) for a predetermined time Δ.
It waits for a predetermined time ΔT2, and after the time ΔT□ elapses, the control signal C9 to the motor driver 4 is set to H'' (motor ON), and it waits for a predetermined time ΔT2. After the time ΔT2 has elapsed, the cutter position of the cutter unit 1 is detected. The position signal SA from the sensor is checked to determine whether the cutter of the cutter unit 1 has reached the stop position, and this process, that is, the on/off control of the motor current, is repeatedly executed until the cutter of the cutter unit 1 has reached the stop position.

When the cutter of the cutter unit 1 reaches the stop position, the control signal CS to the motor driver 4 is set to L''.
(motor 0FF), that is, the motor current to the DC motor 2 is cut off, and the process ends.

Next, this process will be specifically explained with reference to FIG. 3 (herein referred to as "the same figure").

As shown in the same figure (b), the motor control circuit 3 sets the control signal C5 to the motor driver 4 to H'' at the cutter drive timing T□, so that the motor driver 4 outputs a signal to the DC motor 2. As shown in FIG. 3C, motor current r is supplied, the DC motor 2 rotates, and the cutter of the cutter unit 1 starts rotating.

At this time, as shown in FIG.
1, and from time T2 when the cutter starts cutting the paper, the cutter starts cutting the paper and the load increases, so the current increases to I2.

Then, at time T when the cutter of the cutter unit 1 finishes cutting the paper, the position signal SA from the cutter position detection sensor of the cutter unit 1 rises from L'' to H'' as shown in FIG. At the rising time T of the position signal SA, the motor control circuit 3 switches the control signal Cs for the motor driver 4 to L'' and 'H'' at predetermined time intervals, as shown in FIG.

As a result, the motor current ■ from the motor driver 4 to the DC motor 2 changes at time T, as shown in FIG.
The current ■3 is smaller than the current ■3 during free rotation between ~T7.

Thereafter, at time T4 when the cutter of the cutter unit 1 reaches the stop position, the cutter unit 1-1 is moved as shown in FIG.
The position signal SA from the cutter position detection sensor falls from H'' to L'', and the falling point of this position signal SA is T4.
Then, the motor control circuit 3 sets the control signal CS to the motor driver 4 to L'' as shown in FIG.

As a result, the motor current to the DC motor 2 is cut off and the cutter of the cutter unit 1-1 is stopped, as shown in FIG.

In this case, before this motor current is cut off, only a smaller current is flowing than during the initial free rotation, so D
The rotation of the C motor 2 is weak, and therefore the inertia of the motor is small when the motor current is cut off, so the overrun amount is small and the stop position can be easily controlled.

In this way, in this motor drive device, the motor current to the DC motor is controlled on and off after the cutter finishes cutting the paper, and the motor current to the DC motor is cut off at the cutter stop position. It becomes possible to stop the cutter at a predetermined position without using an attached motor driver.

In the above embodiment, an example was described in which the motor current is cut off when it is detected that the cutter has reached the stop position. You can also do this.

Further, this cutter driving device can be implemented in any cutter driving device such as a facsimile machine, a printer, a copying machine, and the like.

Effects As explained above, according to the present invention, the cutter can be stopped at the correct position with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an example of a motor drive control process executed by the motor control circuit, and FIG. 3 is a timing diagram showing a specific explanation thereof. It is a chart diagram. 1... Cutter unit 2... DC motor 3...
・Motor control circuit 4...Motor driver Figure 1 Figure 3

Claims (1)

[Claims] 1. In a cutter drive device that drives a cutter with a DC motor, a means for controlling on/off a motor current to the DC motor after the cutter finishes cutting paper, and cutting off the motor current to the DC motor at a stop position of the cutter. A cutter drive device comprising: