JPH01163086A - Printer - Google Patents

Abstract

PURPOSE:To enable preprint papers differing in format to be mixedly contained in a paper cassette, by adopting a preprint paper provided with a printing- starting position code mark conforming to the format of the preprint papers, and providing a sensor for detecting the marks. CONSTITUTION:A preprint paper 3 is provided with a printing-starting position code mark. The preprint paper 3 contained in a paper cassette 1 is fed to a timing roller 4 by a paper-supplying rollers. A sensor 5 detects the printing- starting position code mark, and outputs a detection signal to a detecting circuit 16. The detecting circuit 16 issues a TOP signal after the lapse of a time TD according to a set value of the printing-starting position. Thus, a VIDEO signal is supplied from a controller with an arbitrary delay behind the detection of the code mark on the paper 3. Therefore, printing can be started without deviation from a desired preprint format, and papers 3 differing in the position of the preprint format can be mixedly contained in the cassette 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic printing apparatus, and particularly to printing start positioning suitable for printing cut sheets for preprinting.

[Conventional technology]

In conventional devices, the leading edge of the paper is used as a reference for the printing start position, and preprinted paper printed with the same format is set in the paper cassette to print.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the position of the format printed on the pre-printed paper as a reference for starting printing, and the paper leading edge is misaligned mechanically in the timing roller section of the paper conveyance system. There have been problems in that there is a printing misalignment with the print format and that preprinted sheets of different formats cannot be mixed in the paper cassette.

An object of the present invention is to solve the above problems.

[Means for solving problems]

The above purpose is to use preprinted paper with a print start position code mark that matches the format of the preprinted paper,
This is achieved by providing a sensor that detects this printing start position code mark.

[Effect]

Preprinted paper fed from a paper cassette passes through a sensor. At this time, the sensor detects the print start position code mark of the preprint and sends a print start command to the upper layer. This eliminates printing misalignment due to paper light misalignment, and allows mixed use of preprinted papers of different formats.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. The photosensitive drum 7, paper feed roller 2. Timing roller 42 separation roller 9. The discharge roller 11 starts rotating.

The paper feed roller moves downward, and the preprinted paper 3 in the paper cassette 1 is conveyed to the timing roller 4. Next, the paper passes through a timing roller 4, and the image on the photosensitive drum 7 is transferred thereto.

Separation roller9. After passing through the fixing device 10, the sheet is discharged onto a paper tray 12 by a discharge roller 11. The transferred image on the photosensitive drum 7 is generated by converting the VIDEO signal into an optical signal 1 by a laser oscillator 15.
4, an electrostatic transfer image is formed on the surface of the photosensitive drum via the scanner 13, and developed by the developer 8. When the preprint paper 3 passes the sensor 5, the sensor 5 detects the print start position code mark on the preprint paper and sends a detection signal to the detection circuit 16.

The detection circuit 16 decodes the sensor detection signal β and follows the print start position setting value. After the TD time has elapsed, a TOP signal is issued, and the TOP signal is sent to the transmitting/receiving circuit 17. When the control device receives the TOP signal, after an arbitrary T1 time, the VI
Sends the DEO signal to the printing device side. The above time chart is shown in FIG.

According to the above embodiment, since the VIDEO signal comes from the control device after an arbitrary time from the print start position code mark on the preprint paper, the print start position code mark
This has the effect that printing can be started at any position without deviation from the preprint format.

〔Effect of the invention〕

According to the present invention, it is possible to mix and use preprint papers with different preprint format positions in a paper cassette,
In addition, it is effective in improving the efficiency of printing operations because it prevents printing misalignment with the format6.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram and circuit block diagram of a printing process of a printing apparatus according to an embodiment of the present invention, and FIG. 2 is a time chart. 1... Paper tray, 2... Paper feed roller, 3... Preprint paper, 4... Timing roller, 5...
Sensor, 6...paper guide, 7...photosensitive drum,
8...Developing device, 9...Separation roller, 10...Fixing device, 11...Ejection roller, 12...Paper tray, 1
3...Scanner. 14... Optical signal, 15... Laser oscillator, 16...
・Detection circuit, 17... Transmission/reception circuit, 18...-Blower. 19...Transfer charger.

Claims (1)

[Claims] 1. In an electrophotographic printing device consisting of a paper feed roller, a paper cassette, a timing roller, and a photosensitive drum, a print start position code mark is provided on the preprinted cut paper, and a sensor that detects this mark is connected to the timing roller. and a photosensitive drum, the printing device is characterized in that the print start position is determined from a print start position code mark.