JP2002292950A - Method of detecting size of mark for continuous paper printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of detecting size of a mark in a continuous paper electrophotographic device that can adequately detect the size of the mark when a conveyance speed is varied or a transient starting-up or stopping operation is executed. SOLUTION: The size of the mark is detected by a method of counting a sensor signal for outputting the presence or absence of the mark by using an encode signal of a roll conveyance motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a mark size of a continuous paper printing apparatus.

[0002]

2. Description of the Related Art FIG. 2 shows a block diagram of a conventional mark detection system. The conventional mark size detection method uses a timer 4 with a fixed clock input 5, and detects the mark size by counting the presence or absence of a mark signal by time.

[0003]

FIG. 4 shows a timing chart of a conventional mark detection system. In the mark size detection method using a clock input timer, the mark size can be correctly detected at a constant speed (in the case of M2), but when the transport speed is different (in the case of M2 ') or when the transfer speed is increased or decreased. At the time of conveyance (in the case of M1 and M1 '), the mark size could not be detected correctly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mark size detecting method for a continuous paper printing apparatus capable of correctly detecting a mark size when the transport speed is different or when transitional start-up and fall-off are performed. It is in.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for detecting a mark size of a continuous paper printing apparatus comprising a roll transport motor having an encoder and a mark sensor for outputting the presence or absence of a mark on a transported paper. This is achieved by counting the mark signal output from the mark sensor with the encoder signal of the roll transport motor and detecting the mark size.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a mark size detection system using a mark sensor and an encoder of a roll transport motor. In FIG. 1, 1 is a roll transport motor, 2 is an encoder, 3 is a mark sensor, and 4 is a timer. The mark size is detected by a method of counting the mark signal output from the mark sensor 3 with the encoder signal. FIG. 3 shows a timing chart using this method. By counting the mark size in the encoder signal is output in accordance with the paper transport speed, it can detect the correct mark size.

For example, one pulse of an encoder signal is 1 /
In the case of 120 inches, the mark size is read as 9/120 inches by N2 = 9 pulses in FIG.

[0009]

According to the present invention, there is provided a mark size detecting method for a continuous paper printing apparatus capable of correctly detecting a mark size when the transport speed is different or when transitional rise and fall are performed. Can be.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a mark signal detection system using an encoder.

FIG. 2 is an explanatory diagram showing a mark signal detection system using a clock.

FIG. 3 is a timing chart illustrating this method.

FIG. 4 is a timing chart illustrating a conventional mark size detection.

[Explanation of symbols]

1. Roll transport motor, 2. Encoder, 3. Mark sensor, 4. Timer.

Claims (1)

[Claims] A roll transport motor having an encoder;
A mark sensor for outputting the presence or absence of a mark on a sheet to be conveyed, wherein the mark signal output from the mark sensor is counted by an encoder signal of the roll conveying motor, and the mark A mark size detecting method for a continuous paper printing apparatus, comprising detecting a size.