JPS6162398A - Stepping motor drive device of printer - Google Patents

Abstract

PURPOSE:To prevent a stepping motor from causing a stepout phenomenon by controlling the sheet feeding operation in response to the set number of a copy control switch. CONSTITUTION:When many sheets are designated by a copy control switch 11, a detector 12 recognizes it to notify many sheet prints to a controller 13. When the sheet feeding operation request is generated, the controller 13 requests a speed signal generation corresponding to the many sheets for a speed signal generator 14. The controller 13 outputs a drive signal based on the speed signal to a drive unit 15. Accordingly, in case of many sheets as compared with the case of partial sheet, the drive torque of a stepping motor 16 can be increased to reduce the stepout phenomenon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a stepping motor drive device for a printer, and more particularly to a stepping motor drive device used for paper feeding in an impact printing type printer.

[Technical Background of the Invention and Problems Therewith] Conventionally, in an impact printing type printer, the paper feeding operation has characteristics as shown in FIG. In other words, the paper feed speed is the same for multiple copies (two or more copies) as for a partial set, regardless of the number of copies set on the copy control switch.

However, when printing multiple copies of paper, the paper is heavier than the tram, so depending on the type of paper, the proper feeding operation may not be executed, and therefore there is a high possibility that the stepping motor will step out.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to control the paper feeding operation according to the number of sheets set on the copy control switch, and to prevent the occurrence of step-out phenomenon in the stepping motor. The stepping motor drive device of the printer can be prevented by using one pair of printers.

[Summary of the Invention] A stepping motor drive device according to the present invention includes a copy control switch that switches a setting port according to the number of copies of paper, a detection circuit unit that detects a setting value of the copy control switch, and the copy control switch. a speed signal generation section that generates a speed signal according to a set value of; a control section that outputs a drive signal based on the detection signal of the detection circuit section and the speed signal from the speed signal generation section;
This is accomplished by a drive section that outputs a drive current and a phase switching signal based on the output signal of the control section.

This device drives the stepping motor using this current and phase switching signal, and drives the stepping motor at a speed (driving torque) corresponding to the set number (weight) of sheets.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows the configuration of a stepping motor drive device used in an impact printer. In the figure, numeral 11 is a copy control switch that changes the setting value according to the set number of sheets of paper. The setting state of this copy control switch 11 is recognized by the detection circuit unit 12.In other words, whether the setting value is for one copy of paper (“1” on the scale) or for multiple copies of paper (“1” on the scale). The detection signal from the detection circuit section 12 is detected by the control section 1.
It is designed to be sent to 3. The control section 13 outputs a control signal in accordance with the input detection signal, and sends a control signal to the speed signal generation section 14 for speed 1! This request is to output either the It signal or the multi-sheet speed signal. The speed signal generating section 14 outputs a speed signal to the control section 13 based on the control 21I signal from the control section 13 in accordance with one sheet or multiple sheets. Further, the control section 13 receives this speed signal and outputs a drive signal to the drive section 15. The drive unit 15 outputs a drive current and a phase switching signal to the stepping motor 16 based on the input drive signal.

Next, the operation of B111 will be explained. First, when multiple copies of paper, for example two copies, are specified by the copy control switch 11, the detection circuit section 12 recognizes this and controls the control section 1.
3, a detection signal is output to notify that multi-copy printing is being performed. Then, when a paper feeding operation request is generated, the control section 13 requests the speed signal generation section 14 to generate a speed signal corresponding to multiple copies of paper. This speed signal is, for example, a pulse proportional to the speed, and its frequency matches the phase switching frequency of the stepping motor 1G.

Then, the control section 13 outputs a drive #J signal to the drive section 15 based on this speed signal. This drive signal is, for example, a phase excitation signal for the stepping motor 16.

The drive unit 15 outputs a drive current and a phase switching signal at a frequency corresponding to the drive signal input to the stepping motor 16. The stepping motor 1G receives this drive current and phase switching signal and is driven at a frequency corresponding to the output of the speed signal generator 14.

That is, as shown in Fig. 2, this stepping motor 1G operates at a constant speed in a constant speed area after passing through an acceleration area for a certain period of time, but in the case of multi-sheet printing, Compared to the case of partial paper printing, the speed in the constant speed area is reduced by a certain amount. Therefore, the driving torque of the stepping motor 1G can be increased in the case of multiple sheets compared to the case of a single set, and the stepping motor step-out phenomenon caused by the weight of the paper that conventionally occurred can be reduced. It is something that can be done. At the same time, it is also possible to significantly reduce the occurrence of paper jams that are peculiar to multi-paper printing.

In the above embodiment, two types of speed signals are generated to distinguish between a single set and multiple sets, but the invention is not limited to this, and different speed signals may be generated depending on the set number of sheets. By generating , it is possible to further improve performance.

[Effects of the Invention] As described above, according to the present invention, there is provided a stepping motor for a printer that can prevent the tax adjustment phenomenon of the stepping motor caused by the paper size and realize proper paper feeding regardless of the fI WH of the paper. It is possible to provide a head-mounted weapon.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the flashing of a stepping motor drive device according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of paper feed speed by the device shown in FIG. 1, and FIG. 3 is a conventional stepping motor drive It is a characteristic diagram of the paper feeding speed by the apparatus. 11... Copy control switch, 12... Detection circuit section, 13... Control section, 14... Speed signal generation section, 15... Drive section, 16・・・Stepping motor. Applicant's agent #Buyaku Takehiko Suzue 5

Claims (1)

[Claims] A stepping motor drive device used in a paper feed mechanism of an impact printing printer includes a copy control switch that switches a setting value according to the number of copies of paper, a detection circuit unit that detects the setting value of this copy control switch, and the above-mentioned. a speed signal generation section that generates a speed signal according to the setting value of the copy control switch;
A control unit that outputs a drive signal based on the detection signal of the detection circuit unit and a speed signal from the speed signal generation unit, and a drive unit that drives the stepping motor based on the output signal of the control unit. A printer stepping motor drive device featuring: