JPH033797A - Driving method for chart cutting device - Google Patents

Abstract

PURPOSE:To shorten a chart cutting time by the part where the number of rotations becomes high and to shorten a communication time by finding a cutting torque value from the initial cutting up to the cutting completion and setting the number of rotations of a pulse motor according to this cutting torque value. CONSTITUTION:The cutting torque values from the initial cutting up to the cutting completion are found and the number of rotations of a pulse motor is set lower in case of a high cutting torque value and set higher in case of a low cutting torque value. A chart cutting time can thus be shortened and the temperature rise of the pulse motor can be constrained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of driving a recording paper cutting device in a facsimile machine or the like.

(Prior Art) Conventionally, in facsimile machines and the like, received information is printed on continuous recording paper, and the recording paper is cut widthwise at appropriate points so that it can be provided as multiple sheets. .

Therefore, a recording paper cutting device is disposed in the recording paper feeding path so as to extend in the width direction. The recording paper cutting device has a rotary blade rotated by a pulse motor and a fixed blade fixed to the recording paper cutting device and disposed opposite to the rotary blade.

FIG. 2 is a perspective view of the conventional recording paper cutting device, FIG. 3 is a diagram showing the cutting torque values of the recording paper cutting device from the beginning of cutting to the end of cutting, and FIG. 4 is a diagram showing the rotation speed of the pulse motor and The relationship diagram of motor output torque, Figure 5, shows the cutter rotation status,
It is a timing chart of the pulse motor rotation speed and the motor output torque obtained thereby.

In FIG. 2, reference numeral 2 denotes a fixed blade which is fixed to the recording paper cutting device. 1 is a rotary blade provided opposite to the fixed blade 2, and 4 is a pulse motor for rotating the rotary blade 1.

The rotary blade 1 is pivotally supported by left and right support members 5 and 5', and is oscillated by rotating the pulse motor 4. The support member 5 supports the rotary blade 1 at a higher position than the support member 5', and the rotary blade 1 is oscillated by the pulse motor 4 and slides on the fixed blade 2, so that the contact point P moves left and right. , the recording paper 3 is cut.

Next, the operation of the recording paper cutting device will be explained.

When the pulse motor 4 is driven and the rotary blade I swings, the recording paper 3 fed by a recording paper feeding device (not shown) is cut. That is, the contact point P moves from the right to the left in the figure and cuts the recording paper 3. After cutting is completed, the rotary blade 1 is reversely rotated and returned to its home position. At this time, the contact point P moves to the right end of the figure.

FIG. 3 is a diagram showing cutting l/lux values from the start of cutting to the end of cutting.

In the figure, it can be seen that the cutting 1-lux value has different characteristics depending on the cutting position. That is, the cutting torque value is high at the beginning of cutting and gradually decreases.

In a steady state, the cutting torque value remains low, and at the end of cutting, the cutting torque value increases again.

FIG. 4 is a diagram showing the relationship between the rotation speed of the pulse motor and the motor output torque.

In the figure, it can be seen that when the rotation speed of the pulse motor is low, the motor output torque becomes high, and when the rotation speed of the pulse motor is high, the motor output torque becomes low.

FIG. 5 shows the rotational state of the cutter, the rotational speed of the pulse motor, and the resulting motor output torque in the conventional cutting method.

When cutting the recording paper, the required maximum cutting torque value increases, so the rotation speed of the pulse motor decreases, and when returning the rotary blade 1, the required maximum cutting torque value decreases, so the rotation speed of the pulse motor decreases. becomes higher.

(Problem to be Solved by the Invention) However, in the driving method of the recording paper cutting device having the above configuration, the number of rotations of the pulse smoke when cutting the recording paper becomes low, so the recording paper cutting time increases, and multiple Communication time cannot be shortened when transmitting and receiving sheets of recording paper.

Furthermore, if the motor output torque continues to be generated more than necessary, the amount of heat generated by the pulse motor increases, which may shorten the life of the pulse motor or adversely affect other parts.

The present invention solves the problems of the conventional method of driving a recording paper cutting device, thereby shortening the cutting time and communication time, as well as reducing the amount of heat generated by the pulse motor and extending its life. Moreover, it is an object of the present invention to provide a method for driving a recording paper cutting device that can reduce the influence of excessive motor output torque on other parts.

(Means for Solving the Problems) To achieve this, the method for driving a recording paper cutting device of the present invention is a recording paper cutting device that cuts recording paper using a rotary blade and a fixed blade that are oscillated by the rotation of a pulse motor. In the driving method, the cutting torque value from the start of cutting to the end of cutting is determined, and when the cutting torque value is high, the rotation speed of the pulse motor is set low, and when the cutting torque value is low, the rotation speed of the pulse motor is set high. There is.

(Function) According to the present invention, the cutting torque value from the start of cutting to the end of cutting is determined as described above, and when the cutting torque value is high, the rotation speed of the pulse motor is decreased, and when the cutting torque value is low, the pulse motor is decreased. Since the rotational speed is set high, it is possible to shorten the recording paper cutting time and suppress the temperature rise of the pulse motor.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a timing chart showing the cutter rotational state, the rotational speed of the pulse motor, and the resulting motor output torque in the driving method of the recording paper cutting device of the present invention.

As described above, the cutting torque value in the recording paper cutting process has different cutting torque value characteristics depending on the recording paper cutting device. For example, in the cutting torque value characteristic of the conventional recording paper cutting device described in Section 2, the cutting torque value is high at the beginning and end of cutting, and the cutting torque value is relatively low during cutting.

Therefore, in the method for driving a recording paper cutting device of the present invention, first, the cutting torque value characteristic is determined, and the rotation speed of the pulse motor is set in accordance with the cutting torque value characteristic. That is, at the beginning and end of cutting, where the cutting torque value is high, the rotation speed of the pulse motor is lowered to increase the motor output torque, and during cutting, where no motor output torque is required, the rotation speed of the pulse motor is increased. .

The cutting time can be shortened by increasing the rotational speed, and the motor output torque is reduced during that time, so that no more motor output torque than necessary is generated.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

For example, in this embodiment, a facsimile machine has been described, but the present invention can also be applied to other devices equipped with a cutting device.

(Effects of the Invention) As described above in detail, according to the present invention, the cutting torque value from the start of cutting to the end of cutting is obtained, and when the cutting torque value is high, the rotation speed of the pulse motor is decreased, and the cutting torque value is Since the number of rotations of the pulse motor is set high when the number of rotations is low, the recording paper cutting time can be shortened by the amount that the number of rotations increases, and the communication time can be shortened.

Further, during this time, more than necessary motor output torque is not generated, so that heat generation of the pulse motor can be suppressed and temperature rise can be suppressed.

Therefore, it is possible to prevent a decrease in the life of the pulse motor, and also to eliminate the influence on other parts.

[Brief explanation of the drawing]

FIG. 1 is a timing chart showing the crank rotation state, the rotation speed of the pulse motor, and the resulting motor output torque in the driving method of the recording paper cutting device of the present invention;
Fig. 2 is a perspective view of a conventional recording paper cutting device, Fig. 3 is a diagram showing cutting torque values from the beginning of cutting to the end of cutting, and Fig. 4 is a diagram showing the rotation speed of the pulse motor and the motor output. The related diagram, FIG. 5, is a timing chart showing the crank rotation state, the number of revolutions of the pulse motor, and the resulting motor output torque in the conventional cutting method. ■... Rotating blade, 2... Fixed blade, 3... Recording paper, 4
...Pulse motor, 5.5'...Support member.

Claims (1)

[Scope of Claims] A method for driving a recording paper cutting device for cutting recording paper using a rotary blade that swings due to rotation of a pulse motor and a fixed blade that faces the rotary blade, which includes: (a) cutting from the beginning of cutting; (b) When the cutting torque value is high, the rotation speed of the pulse motor is set low, and when the cutting torque value is low, the rotation speed of the pulse motor is set high. How to drive the device.