JPS61177197A - Controlling system for stepping motor - Google Patents

Abstract

PURPOSE:To shorten the total driving time of a stepping motor, by controlling loads in the low speed range of constant speed range when controlling load due to CPU is increased, and in the high speed range of constant speed range when the controlling load is reduced. CONSTITUTION:When a plurality of stepping motors are driven at the same time on the command device of a computer, the motors re driven in two step driving patterns. For example, when the controlling capacity for the stepping motors is set to be 1,000pps, then each motor for paper feed, ribbon feed, carriage feed, and wheel feed is respectively for 250pps, and is driven in the low speed range via through-up of the driving patterns. Then, the paper feed stepping motor is through-up-driven with inertia for rotating, and is rotated at high speed in the two-step high speed range. When the action is terminated, the motor is through-down-controlled to stop the action.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a stepping motor control method in a printer using a stepping motor, and in particular, when controlling a plurality of stepping motors, a computer When the CPU control load is very large, the stepping motor is rotated in the low speed range of the constant speed range, and when the CPU control load is reduced, it is controlled in the high speed range of the constant speed range, reducing the total driving time of the stepping motor. The present invention relates to a control method for a stepping motor in a printer that can be used in a printer.

[Conventional technology]

Conventionally, in order to control printer drive mechanisms such as paper feed, ribbon feed, wheel (tick) feed, and carriage feed, a stepping motor is driven by a command device using a line feed key on a keyboard or data signals from an external source via a buffer. I was going to give it to the drive circuit for the purpose. FIG. 4 is a block diagram showing the relationship between the loading capacity and the stepping motor of a conventional printer, in which 1 indicates an external command device or keyboard, 2
is a buffer that stores data in the CPU's memory,
3 is a CPU command device, 4, 5, 6, and 7 are paper feed/ribbon feed for sequentially switching the current flowing through the stepping motor windings in response to command signals from the oscillator (circuit that generates pulse signals) of the CPU command device 3. - Drive circuit for carriage feed and wheel feed. 8/9/10
・11 is a stepping motor, which is generally used for paper feeding.
Two-phase excitation blade type and 1-2 phase excitation blade type are used for ribbon feeding, wheel feeding, and carriage feeding.

Figure 5 (a) shows stepping motors 8, 9, 10, 1.
1 drive pattern is shown. In general, stepping motors can start, reverse, and stop instantly and accurately in the self-start region of speed and torque characteristics, but in the through region, they start in the self-start region and gradually increase speed and accelerate. In order to increase or decelerate the input pulse speed, the input pulse speed must be slew up or down by gradually lowering the speed.

Between a and b is a through-up area, between b and c is a constant speed area,
The area between c and d is a through-down area.

Also, Fig. 5 (■) shows input pulses that correspond to through-up, constant speed, and through-down freely according to a computer program.

In the conventional example with the above configuration, a plurality of stepping motors 8, 9, 10 are controlled by the command device 3 of the CPU of the computer.
When the stepping motors 11 and 11 are driven at the same time, the stepping motor is subjected to through-up control as shown in FIGS. 5(a) and 5(b), and is thereafter rotated at a constant speed. For example, if the computer's control capacity for a stepping motor is 1.
000PPS, stepping motors 8, 9, and 10 for paper feed, ribbon feed, carriage feed, and wheel feed
- 11 is 250 PPS each, and after inputting this pulse, it rotates at a constant speed from through-up, then stops through through-down control, and the operation is completed.

[Problem 3 to be solved by the invention In the conventional example described above, the stepping motors 8, 9,
Since the drive patterns 10 and 11 are one step in the constant speed region in one drive, for example, even after the stepping motors 9, 10, and 11 for ribbon feeding, carriage feeding, and wheel feeding have completed their operations, the stepping motor for paper feeding still remains. 8 is 250
Since the stepping motor continues to rotate at a constant speed under PPS and completes its operation through through-down control, the driving time of the stepping motor becomes long.

[Means for solving problems]

The present invention relates to the control of a plurality of stepping motors, and when the control load on the CPU of a computer is very large in - times of driving, the plurality of stepping motors are rotated in a low speed region of a constant speed region, and the CPU of the computer
An object of the present invention is to solve the problems of the conventional example by making it possible to shorten the total driving time of a stepping motor by performing control in a high speed region of a constant speed region when the control load of the stepping motor is reduced.

Identical components are designated by the same reference numerals, and the present invention will be described below. FIG. 1(a) shows a two-stage drive pattern of the stepping motors 8, 9, 10, and 11 of the present invention.
Between f is through-up area, between f-8 is low speed area, g-b
1 is a through-up region, 1-1 is a high-speed region, 1-] is a through-down region, and 1) in FIG. 1 is an input pulse.

[For production]

To explain this invention in detail, a plurality of stepping motors 8, 9, 10, 11 are controlled by a command device 3 of a computer.
When simultaneously driven, the stepping motor will move as shown in Figure 1(a).
And it is driven in a two-step drive pattern as shown in (b). For example, if the control capacity of a computer's stepping motor is 1,000 PPS, stepping motors 8, 9, 10, and 11 for paper feed, ribbon feed, carriage feed, and wheel feed each have a capacity of 25
0PPS, and is driven in the low speed region of f-g through the through-up of the drive pattern shown in FIG. 1(a). Here, to explain the paper feed stepping motor 80 as an example, the ribbon feed, carriage feed, and wheel feed stepping motors 9, 10, and 11 are subjected to through-down control and stopped when their operations are completed to complete their operations. Therefore, the paper feed stepping motor 8 is driven through up while having inertia to rotate, so it does not step out and is rotated at high speed in a two-step high speed range (1,0 OOPPS), and its operation is completed. Through-down control is performed to stop and complete the operation.

A comparison of the two-step drive pattern described above and the conventional one-step drive pattern results in a time chart shown in FIG. 2. That is, in the present invention, by setting the two-stage drive pattern, the time required for the overall stepping motor is reduced by -d as shown in the figure, compared to the conventional example.

The above operation is concretely expressed in a flowchart as shown in FIG. When an electrical signal is input into the command device 3 of the computer in this flowchart, the CPU of the computer determines whether through-up is set,
If it is set, the stepping motor is controlled through-up by the command device 3, and reset when the operation is completed.
Next, continue is determined, low speed mode and other motor END are determined, and finally the stepping motor is driven at low speed, and the stepping motor that is continuously controlled is changed from low speed drive to high speed drive, and when the operation is completed, the Down control is performed and the operation is completed.

The above explanation has been given using paper feeding as an example, but the same framework applies to other examples.

〔Effect of the invention〕

As detailed above, the present invention relates to the control of a plurality of stepping motors, and the driving pattern of the stepping motor is formed into a through-up region, a low-speed region, a through-up region, a high-speed region, and a through-down region in - times of driving. When the control load by the computer CPU is very large, rotate it in a low speed region of the constant speed region and control the computer CPU.
Even when the control load on the PU is reduced, the stepping motor, which is continuously controlled, can be controlled in a high speed range of a constant speed range. Therefore, there is a functional effect that the total driving time of the stepping motor can be shortened by effectively utilizing the load capacity of the CPU of the computer. In this embodiment, a stepping motor is used as the drive motor, but it goes without saying that a DCf-bo motor can also have the same effect.

[Brief explanation of the drawing]

FIGS. 1(a) and (b) are explanatory diagrams showing the stepping motor drive pattern and input cabling for the present invention, FIG. 2 is a time chart regarding the driving of the stepping motor of the present invention, and FIG. The operation flowchart of the present invention, FIG. 4, is a block diagram showing the relationship between a conventional printer device and a stepping motor, and FIGS.
b) is an explanatory diagram showing a drive pattern and an input pulse of a conventional stepping motor.

Claims (1)

[Claims] A drive mechanism including a plurality of stepping motors 8, 9, 10, 11, a drive circuit 4, 5, 6, 7 that drives the plurality of stepping motors 8, 9, 10, 11, A command device 3 supplies a command signal that gives an operating amount to the drive circuits 4, 5, 6, 7, and a plurality of stepping motors 8, 9, 10, 11 driven by the command signal are driven once in one drive. A printer that rotates by a fixed amount in a constant speed range of steps is provided with a plurality of stepping motors that rotate in a low speed range each time a command signal from the command device 3 is supplied, and that have different driving times. A control method for a stepping motor, characterized in that in synchronization with the reduction of load on a computer CPU due to stopping of a stepping motor, other stepping motors are rotated from a low speed region to a high speed region and then subjected to through-down control.