JPH0382399A - Driving method for stepping motor - Google Patents

Abstract

PURPOSE:To automatically shorten sheet feeding time of a printer by detecting forms handling option placing, and altering a stepping motor driving frequency. CONSTITUTION:A clock pulse 11 for determining a driving frequency is supplied to a circuit having a distribution/exciter 3 to be controlled by a microprocessor 1 and a stepping motor 4 connected to the exciter 3. A signal selector 6 is connected to a clock pulse generator 2, presence or absence of forms handling option placing in a printer is detected as an option identification signal 12 by a forms handling option detector 5, the selector 6 is operated by its detection signal information, a slow clock pulse 13 and a fast clock pulse 14 are selected, and a driving clock pulse is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for driving a paper feeding stepping motor under microprocessor control of a printer device.

[Conventional technology]

Conventionally, the microprocessor-controlled driving method of a paper feeding stepping motor in a printer device was activated at a constant frequency regardless of the presence or absence of a forms handling option (hereinafter referred to as the option) installed in the device.

[Problem to be solved by the invention]

In the conventional drive method described above, since the drive is performed at a constant frequency, the load torque margin of the stepping motor is set in consideration of the maximum load depending on the installed options. Further, the driving frequency of the stepping motor and the motor output torque are inversely proportional, and as the driving frequency increases, the output torque decreases.

Therefore, if the drive frequency is set in accordance with the installation of options, there is a drawback that when the options are not installed, an excessive load torque margin and paper feeding time will be wasted.

The object of the present invention is to improve these drawbacks and provide a printer device that can obtain a shorter paper feeding time than in the case where options are not installed.

[Means to solve the problem]

The driving method of the present invention is capable of outputting clock pulses of different frequencies from the detection circuit for identifying whether an option is installed. This can be realized by a two-output clock pulse generation circuit and a signal selection circuit that selects two clock pulses to change the stepping motor drive frequency based on the aforementioned detection signal information.

〔Example〕

To explain one embodiment of the present invention in detail based on the drawings, as shown in FIG. 1, a circuit consisting of a distribution/excitation circuit 3 controlled by a microprocessor 1 and a stepping motor 4 connected to the When supplying the clock pulse 11 that determines the frequency, the signal selection circuit 6 is connected to the clock pulse generation circuit 2, which has two outputs: a slow clock pulse 13 and a fast clock pulse 14, and the selection circuit 6 is connected to the clock pulse generation circuit 2, which has two outputs: a slow clock pulse 13 and a fast clock pulse 14, and the selection circuit 6 is connected to the clock pulse generation circuit 2, which has two outputs: a slow clock pulse 13 and a fast clock pulse 14. Forms handling option detection circuit 5 generates option identification signal 12
Based on the signal information, a signal selection circuit is operated to select one of the two outputs of the clock pulse generation circuit and use it as a drive clock pulse.

With the configuration as described above, as shown in Figure 2, when an option is installed, the option identification signal is "0",
A slow clock pulse is selected as the clock pulse, and the driving frequency of the stepping motor is kept low.

Therefore, the rotational speed of the stepping motor is slow, and the time required for constant angle rotation is long.

Further, as shown in FIG. 2, when no option is installed, the option identification signal is "1", a fast clock pulse is selected as the clock pulse, and the driving frequency of the stepping motor becomes high. Therefore, the rotational speed of the stepping motor is high, and the time required for constant angle rotation is short.

Although the above explanation is based on a hardware circuit, it is also possible to change the clock pulse frequency by identifying options using a microprocessor and controlling the clock pulse generation circuit as a program process.

〔Effect of the invention〕

As explained above, the present invention detects the installation of the forms handling option in a printer having a paper feeding stepping motor controlled by a microprocessor, and changes the driving frequency of the stepping motor to increase the paper feeding time when the form handling option is not installed. can be automatically shortened, which has the effect of improving the performance of the printer device.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is an operation timing diagram when the forms handling option is added to the device, and Fig. 3 is an operation timing diagram when the forms handling option is not added to the device. , FIG. 4 is a block diagram of a conventional drive system. DESCRIPTION OF SYMBOLS 1... Microprocessor, 2... Clock pulse generation circuit, 3... Distribution/excitation circuit, 4... Stepping motor, 5... Forms handling option detection circuit, 6... Signal selection circuit, 11...Clock pulse, 12...Option identification signal, 13...
Slow clock pulse, 4...Fast clock pulse.

Claims (1)

[Claims] A printer device having a stepping motor for paper feeding controlled by a microprocessor, which detects the presence of a forms handling option and changes the stepping motor drive frequency to shorten the paper feeding time when the stepping motor is not equipped. Driving method.