JPH0545961A - Printing device for cut paper - Google Patents

Abstract

PURPOSE:To prevent the omission of checking a scratch on the surface of an organic photoconductor(OPC) corresponding to a paper overlap preventing period between respective pages and to check the scratch over the entire circumference of a photosensitive body as to a printing device for a cut paper provided with an OPC film take-up mechanism and an OPC joint cap detecting sensor. CONSTITUTION:Data group for each paper size is stored in the internal memory of a control part in a printing device, and a means for changing a printing start position between the first rotation and the second rotation of the photosensitive body in synchronism with an OPC joint cap 1 detecting signal in accordance with the size of a printing paper based on the data when the instruction of printing for checking the scratch on an OPC film photosensitive body 2a is given from a master controller is added in the control part in the printing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an organic photoconductor (hereinafter referred to as
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device for a cut sheet using a film photoreceptor (abbreviated as OPC), and more particularly, to an improvement of this type of printing apparatus having a scratch check means on the OPC film photoreceptor.

[0002]

2. Description of the Related Art Printing control of a conventional type cut paper printing apparatus having an OPC film winding mechanism will be described with reference to FIGS. 2 and 4, and FIG.
Is a block diagram for explaining transmission / reception of signals between the main control device 11, the printing device control unit 12, and each unit in the printing device. FIG. 4 is a layout explanatory diagram of the OPC film photoconductor 2 and the optical unit 4. FIG. 5 is a time chart for checking the scratches on the OPC film photoconductor 2 by the conventional printing apparatus.

Upon receiving a print start signal from the main controller 11, the in-printer controller 12 starts the rotation operation of the photoconductor 2, and when the photoconductor 2 reaches a constant speed, the main controller 11 is started. The print data receivable status information is transmitted to.

When the main controller 11 recognizes that it is ready to receive print data, the controller 1 in the printer 1
2, the paper feed / discharge destination data and the paper size data are transmitted.

The in-printer control unit 12 feeds paper from the hopper into the printing apparatus according to the paper feed information, and uses the OPC joint cap detection signal 16 from the input circuit 14 as a reference to detect the OPC joint cap 1. After the exposure point passage waiting time T _{1 has} elapsed, the output circuit 15 outputs the print data request signal 17 and waits for print data from the main controller 11.

When the control unit 12 in the printing apparatus receives the print data from the main control unit 11, the optical unit 4 sends the OPC to the OPC.
The film 2a is exposed for a period of paper size L.

Data exposure for the next page starts after the paper overlap prevention period T _{4 has} elapsed.

Then, the above-described control is performed by the photosensitive member 1.
When the number of prints that can be printed on the circumference is performed and the printing of the number of prints for one cycle is completed, the OPC joint detection signal 16 for the second cycle is waited and the same print control as above is repeated.

[0009]

The printing control of the conventional type cut sheet printing apparatus having the OPC film take-up mechanism is performed as described above, but in the conventional case, the sheet overlap prevention between the pages is prevented. It was not possible to perform a scratch check on the OPC surface corresponding to the period T ₄ .

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to correspond to the paper overlap prevention period between pages.
An object of the present invention is to provide an improved cut sheet printing apparatus capable of checking scratches on the C surface as well.

[0011]

SUMMARY OF THE INVENTION The above-described object is to provide an OPC film take-up mechanism and an OPC seam cap detection sensor in a cut sheet printing apparatus, in which
Print instructions for checking scratches on PC film photoconductor (hereinafter,
Check pattern) is issued, based on the data stored in the internal memory of the control unit in the printing device, the print start position is synchronized with the OPC seam cap detection signal according to the print paper size, This is achieved by adding a means for changing between the first and second rounds of the photosensitive member to the control unit in the printing apparatus.

That is, in the present invention, in the case of check pattern printing, attention is paid to the fact that there is no delay in data transfer from the main control device to the data request signal from the printing device side, and the main control device starts check pattern printing. While the control signal in the printing device recognizes the check pattern signal by sending the instruction signal, the control device in the printing device stores the print start time from the seam detection signal in its internal memory according to each paper size. Data for changing between the first and second rounds of the photoconductor is stored, and when the check pattern start instruction signal is recognized, the first and second rounds of the photoconductor based on the data according to each sheet size. By changing the printing start position depending on the circumference, it is possible to check the scratches on the complete set of photoconductors.

[0013]

As described above, according to the present invention, the variable data of the print start position according to the print paper size is selected from the internal memory of the control unit in the printing device by the check pattern instruction from the main control device. , The printing start position can be changed between the first and second rounds of the photoconductor based on the signal from the OPC seam cap detection sensor, so that the paper overlap prevention period between the pages that could not be printed in the first round is printed. It is possible to prevent omission of flaw check on the corresponding OPC surface.

[0014]

EXAMPLE The present invention will be described below with reference to FIGS. 1 and 3 while referring to FIGS. 2 and 4 used in the description of the conventional example. FIG. 1 shows an OPC film photoreceptor by the apparatus of the present invention. 2 is a time chart in the case of checking the scratches on FIG. 2, and FIG. 3 is a data configuration diagram of the internal memory indicated by reference numeral 13 in FIG.

When the print start signal is received from the main controller 11, the in-printer controller 12 starts the rotation operation of the photoconductor 2, and when the photoconductor 2 reaches a constant speed, the main control unit 11 is started. The print data receivable status information is transmitted to.

When the main control unit 11 recognizes that the print data can be received, it issues a check pattern instruction to the internal control unit 12 of the printing apparatus, the paper feed / discharge destination data and the paper size data. And send.

The internal control unit 12 of the printing apparatus includes an internal memory 1.
The data group of T ₁ , T ₂ and T ₃ corresponding to the size data is selected from ₃ and the exposure point passage waiting time T ₁ of the OPC joint cap ₁ elapses with reference to the OPC joint cap detection signal 16 from the input circuit 14. After that, the output circuit 15 outputs the print data request signal 17.

The main controller 11 uses the print data request signal 1
7, the print data is sent for the size L.

When printing for one round of the photosensitive member is completed, 2
Based on the OPC joint cap detection signal 16 of the lap,
OPC joint cap 1 exposure point waiting time T ₃ (T ₁ +
After the elapse of (T ₄ + L / 2), the print data request signal 17 is output from the output circuit 15 to change the print data receiving position from the main controller 11.

As described above, the print data receiving position is changed and controlled between the first and second rounds of the photosensitive member, thereby
Since it is possible to print the portion corresponding to the paper overlap prevention period T ₄ that was not printed in the second round in the second round, it is possible to check the scratches on the entire circumference of the photoconductor.

In the above embodiment, the case where the value of the exposure point passage waiting time T ₃ of the OPC joint cap 1 in the second lap is T ₁ + T ₄ + L / 2 has been exemplified.
The present invention is not limited to this,
The value of T ₃ may be T ₁ + T ₄ or more and L−T ₄ or less.

[0022]

The present invention is as described above, and as is apparent from the description of the illustrated embodiment, according to the present invention, the OPC surface corresponding to the sheet overlap prevention period between pages is also checked for scratches. It is possible to provide an improved cut sheet printing apparatus that can be performed.

[Brief description of drawings]

FIG. 1 is a time chart for checking scratches on an organic photoconductor (OPC) film photoreceptor 2 by the device of the present invention.

FIG. 2 is a block diagram for explaining transmission / reception of signals between a main control device 11, a printing device control unit 12, and further various printing device units.

FIG. 3 is a data configuration diagram of an internal memory indicated by reference numeral 13 in FIG.

FIG. 4 is a layout explanatory diagram of an OPC film photoconductor 2 and an optical unit 4.

FIG. 5 is a time chart in the case of checking a scratch on the OPC film photoconductor 2 by a conventional printing device.

[Explanation of symbols]

1 ... OPC seam cap, 2 ... OPC film photoreceptor,
2a ... OPC film, 3 ... OPC seam cap detection sensor, 4 ... Optical unit, 5 ... OPC winding mechanism, 11
... main control device, 12 ... printer control unit, 13 ... internal memory, 14 ... input circuit, 15 ... output circuit, 16 ... OP
C seam cap detection signal, 17 ... Print data request signal.

Claims (1)

[Claims] 1. A cut sheet printing apparatus comprising an organic photoconductor (OPC) film winding mechanism and an OPC joint cap detection sensor, wherein a print instruction for checking a scratch on the OPC film photoreceptor is sent from a main controller. Pattern), the print start position is set to OPC according to the print paper size based on the data stored in the internal memory of the control unit in the printing apparatus.
In synchronization with the joint cap detection signal, the first and second laps of the photoconductor
A printing apparatus for cut sheets, characterized in that a means for changing between the circumference and the control section is added to the control section in the printing apparatus.