JPH02106532A - Sheet conveying device - Google Patents

Abstract

PURPOSE:To prevent inaccurate conveyance of sheets to constantly maintain a fixed feed amount of the sheets by detecting an actual feed amount of the sheet by detection of the position of a stepping motor, stopping conveyance of the sheet when feed of the sheet is inaccurate, and continuing to convey after the inaccurate conveyance of the sheets is corrected. CONSTITUTION:A control unit 1 outputs signals for commanding the feed operation of sheets to be done to a stepping motor actuating circuit 2 and a comparison circuit 5. The circuit 2 then drives the stepping motor 3 by an angle corresponding to a feed amount of sheets by a signal inputted from the control unit 1. A position detecting circuit 4 then detects the position of the stepping motor and outputs a signal to the comparison circuit 5. The comparison circuit 5 compares the signal from the control unit 1 with the signal from the position detecting circuit 5, and outputs a stop signal 6 when both the signals do not correspond to each other. The circuit 2 received the signal 6 stops the motor, and the control unit 1 stops control until the position of the sheets is corrected and the sheets return to a normal position. When the position of the sheets is corrected and the sheets return to the normal position, output of the signal 6 is stopped, and the control unit 1 and the circuit 2 continue to operate again.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper transport device, and more particularly to a paper transport device that uses a stepping motor as a drive source for paper transport operation.

[Conventional technology]

Conventional paper conveying devices used in printers and the like that use a stepping motor as a driving source operate the stepping motor, which is the driving source, under unilateral control from a control unit, regardless of the actual amount of paper fed. .

[Problem to be solved by the invention]

As mentioned above, in conventional paper conveyance devices that use a stepping motor as a drive source, the stepping motor is driven by the control unit's unilateral control regardless of the actual paper feed amount, so the Even if the standard paper feed amount and the actual paper feed amount are different, the paper continues to be conveyed incorrectly, and if an alarm does not occur, the paper feed must be stopped immediately and restarted from the beginning. .

[Means to solve the problem]

The paper conveyance device of the present invention includes a stepping motor that drives the paper conveyance operation, a position detection means for detecting the position of the stepping motor, and an actual paper feed amount detected by the position detection means and output from the control section. a stepper motor drive means for temporarily stopping driving of the paper conveyance operation by the stepping motor based on an output signal from the comparison means; and a stepper motor drive means for controlling the operation of the stepping motor drive means. It is equipped with a control section.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, a control section 1 outputs a signal instructing a sheet feeding operation to a stepping motor operation circuit 2 and a comparison circuit 5. The stepping motor drive circuit 2 drives the stepping motor 3 by an angle corresponding to the paper feed amount specified by the signal input from the control section 1. The position detection circuit 4 detects the position of the stepping motor and outputs the result to the comparison circuit 5. Comparison circuit 5 compares the signal from control unit 1 and the signal from position detection circuit 4, and when they match, it does not output a stop signal 6, and when they do not match, it outputs a stop signal. Outputs 6. Upon receiving the stop signal 6, the stepping motor drive circuit 2 stops the stepping motor 3, and the control section 1 stops the control until the paper is corrected to the correct position. When the paper is corrected to the correct position, the output of the stop signal 6 is stopped, and the control section 1 and the stepping motor drive circuit 2 resume operation.

〔Effect of the invention〕

As explained above, the paper conveyance device of the present invention detects the actual paper feed amount by detecting the position of the stepping motor, and when incorrect paper feed is performed, the paper is returned to the correct position. It is possible to stop paper transport and wait until the paper is corrected, and then continue paper transport once the paper is corrected to the correct position, preventing inaccurate paper transport and ensuring that the paper feed amount is always accurate. It has the effect of being able to maintain

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Control unit, 2...Stepping motor drive circuit 1.3...Stepping motor,
4...Position detection circuit, 5...Comparison circuit, 6...Stop signal.

Claims (1)

[Claims] a stepping motor that drives paper conveyance operation; a position detection means that detects the position of the stepping motor;
a comparison means for comparing the actual paper feed amount detected by the position detection means with a reference paper feed amount output from the control section; A paper conveyance device comprising: a stepping motor drive unit that temporarily stops driving the operation; and a control unit that controls the operation of the stepping motor drive unit.