JPH0343869B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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, computer in drive
When the control load on the CPU is very large, the stepping motor is rotated in the low speed range of the constant speed range, and when the control load on the CPU 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, the control of drive mechanisms such as paper feed, ribbon feed, wheel feed, and carriage feed in printers has been done by driving a stepping motor from a command device via 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 to do it. FIG. 4 is a block diagram showing the relationship between a conventional printer device and a stepping motor, 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 unit, and 4, 5, 6, and 7 are
A drive circuit for paper feed, ribbon feed, carriage feed, and wheel feed that receives a command signal from the oscillator (circuit that generates a pulse signal) of the CPU's command device 3 and sequentially switches the current flowing through the stepping motor winding. be. Reference numerals 8, 9, 10, and 11 are stepping motors, and generally, a two-phase excitation method and a 1-2 phase excitation method are used for paper feed, ribbon feed, wheel feed, and carriage feed. FIG. 5a shows stepping motors 8, 9, 1
0 and 11 drive patterns are 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 decrease the speed, the input pulse speed must be slew up or down by gradually lowering the speed. The area between a and b is a through-up area, the area between b and c is a constant speed area, and the area between c and d is a through-down area.

FIG. 5b shows input pulses that correspond to slew-up, constant speed, and slew-down that can be freely controlled by the computer program.

In the conventional example with the above configuration, the computer
When a plurality of stepping motors 8, 9, 10, and 11 are simultaneously driven by the CPU's command device 3, the stepping motors are subjected to through-up control as shown in FIGS. 5a and 5b, and then rotated at a constant speed. Ru. For example, if the computer's control capacity for the stepping motor is 1000 PPS, the stepping motors 8, 9, 10, and 11 for paper feed, ribbon feed, carriage feed, and wheel feed are
is 250PPS each, and after inputting this pulse, it rotates at a constant speed from slew-up, then stops after slew-down control, and the operation is completed.

[Problem that the invention seeks to solve]

In the conventional example described above, the driving pattern of the stepping motors 8, 9, 10, 11 is one step in a constant speed region in one drive, so that the stepping motors 9, 11 are used for ribbon feeding, carriage feeding, and wheel feeding, for example. , 11 have completed their motions, the paper feeding stepping motor 8 continues to rotate at a constant speed of 250 PPS and completes its operation through through-down control, so the driving time of the stepping motor becomes longer. I end up.

[Means for solving problems]

This invention relates to the control of a plurality of stepping motors, and the computer
When the control load on the CPU is very large, multiple stepping motors are rotated in the low speed range of the constant speed range, and when the control load on the computer's CPU is reduced, the stepping motors are controlled in the high speed range of the constant speed range and the stepping motors are rotated in the low speed range of the constant speed range. It is an object of the present invention to solve the problems of the conventional example by making it possible to shorten the total driving time of a ping motor.

〔Example〕

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

[Effect]

To explain the operation of the present invention, a plurality of stepping motors 8,
When 9, 10, and 11 are driven simultaneously, they are driven at one stage in the constant speed region (low speed region), and continue to be driven in synchronization with the reduction of the computer load based on the stop of the stepping motor, which has a short drive time. The stepping motor is driven in a high speed region of a two-step drive pattern as shown in FIGS. 1a and 1b. Now, for example, if the computer's control capacity for the stepping motor is 1000 PPS, the stepping motors 8, 9, 10, and 11 for paper feed, ribbon feed, carriage feed, and wheel feed each have a
250 PPS, and is driven in the low speed region of fg through the through-up of the drive pattern of a in FIG. Here, to explain the paper feed stepping motor 8 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 (1000 PPS), and when the operation is completed, the stepping motor 8 is driven through up. Controlled down and stopped to 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 shortened by j-d as shown in the figure, compared to the conventional example.

The above operation is specifically expressed in a flowchart as shown in FIG. 3. In this flowchart, when an electrical signal is input into the command device 3 of the computer, the CPU of the computer determines whether through-up is set, and if it is set, the command device 3 controls the stepping motor through-up, It resets when the operation is completed, then determines continue, determines low speed mode and other motor END, and finally drives the stepping motor at low speed. When each operation is completed, through-down control is performed and the operation is completed.

The above description has been made using paper feeding as an example, but the same 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 motors 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 one drive. computer
When the control load by the CPU is very large, rotate it in a low speed region of the constant speed region, so that the computer's CPU
When the control load on the stepping motor is reduced, the stepping motor, which is continuously controlled, can be controlled in a high speed range of a constant speed range. Therefore, the computer
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. In this example, a stepping motor was used as the drive motor, but a DC
Of course, a servo motor can also have similar effects.

[Brief explanation of drawings]

FIGS. 1a and b are explanatory diagrams showing the driving pattern and input pulses of the stepping motor of the present invention, FIG. 2 is a time chart regarding the driving of the stepping motor of the present invention, and FIG. FIG. 4 is a block diagram showing the relationship between the conventional printer device and the stepping motor; FIGS. 5 a and 5 are explanatory diagrams showing the drive pattern and input pulses of the conventional stepping motor; It is a diagram.

Claims (1)

[Claims] 1. A plurality of stepping motors 8, 9, 10,
11; and a plurality of stepping motors 8, 9, 10, 1.
1, and a command device 3 that supplies a command signal that gives an operating amount to the drive circuits 4, 5, 6, 7, and a plurality of steps that are driven by the command signal. Ping motor 8,
In a printer in which 9, 10, and 11 rotate by a fixed amount in a constant speed region of one stage in one drive, the driving time for rotating in a low speed region is varied each time a command signal from the command device 3 is supplied. Computer CPU equipped with multiple stepping motors and stopping the stepping motors with fast drive times
A stepping motor control method characterized in that in synchronization with the reduction of the load, the stepping motor, which is still rotating continuously, is rotated from a low speed region to a high speed region and then subjected to through-down control.