JPS61262164A - Printing control apparatus - Google Patents

Abstract

PURPOSE:To automatically perform test printing at every definite number of lines, by providing a line counter circuit, a test printing control circuit and a test data generation circuit. CONSTITUTION:In a line printer, when a line counter circuit 1 reaches the predetermined number of lines, a test printing command is applied to a test printing control circuit 2. When printing paper 11 is mounted between the tenth figure and 120-th figure of a printing hammer 10, a paper width detection mechanism applies paper width information to the test printing control circuit 2 which, in turn, orders test printing data to a test data generation circuit 4 so that blank codes are generated in 1-9 figures and 121-132 figures and printing data codes are generated in 10-120 figures. The test data generation circuit 4 generates codes as commanded to send the same to a printing data memory 5 and, when one line data is sent thereto, printing operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing control device, and particularly to a printing control device for a line printer having a test printing function.

BACKGROUND ART Conventionally, a print control device for a line printer does not perform a test print operation during execution of a print job. For this reason, if printing defects such as omitted characters or missing characters occur while performing a large amount of printing work, it is difficult to know which part to repair and repair, so the entire process must be retyped from the beginning, and the printing It was taking a huge toll on paper and computer time.

Therefore, it is an object of the present invention to improve printing of a line printer that can quickly recover from the occurrence of printing defects.
I li II.

1.5.11 The print control device for a line printer/printer according to the present invention successively compares the print data code and the print code corresponding to the moving position of the print character, and if they match, drives the print hammer of the relevant digit to print. A line counter circuit for counting the number of printed lines for a print control device in a line printer,
A test print control circuit that starts test printing based on the contents of this line counter circuit, a paper width detection mechanism that detects the width of printing paper installed in the line printer, and a test print l11n circuit that combines the contents of this paper width detection mechanism with the test print l11n circuit. The present invention is characterized in that it includes a test data generation circuit that generates test data to be printed in response to a command.

1 Emperor 1 Next, the present invention will be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to the figure, in one embodiment of the present invention, one line of print data sent from the external data source 3 is sent to 113a.
The data is stored in the print data memory 5 via the print data memory 5. On the other hand, the type drum 15 rotates at a constant speed 1, and a synchronization pulse outputted in synchronization with the moving position of the type is transmitted to the synchronization pulse detection mechanism 14.
and is applied to the printed code generation circuit 6 via line 14a. As a result, the printed character code generation circuit 6 always holds the printed character code corresponding to the printed character that is in front of the printing hammer 10.

Upon receiving one line of print data, the comparison circuit 7 compares the output 5a of the print data memory 5 with the output 6a of the printed code generation circuit 6, and adds the comparison result to the shift register 8 via a line 7a. The shift register 8 stores the comparison results for each print digit, and its output is applied to the hammer drive circuit 9. The hammer driving circuit 9 drives a printing hammer 10, and the printing hammer 10 strikes the type on the type drum 15 via the printing paper 11 and the ink ribbon 12, thereby performing printing.

The line printer circuit 1 is reset to zero when the power is turned on, and is incremented by "+1" every time one line is printed thereafter. The line counter circuit 1 has a predetermined number of lines (for example, 1000).
When the line 1 is reached, a test print request is applied to the test print control circuit 2 via the line 1a, and the line counter circuit 1 is reset to zero.

On the other hand, the width (
) in the horizontal direction is detected by the paper width detection mechanism 13. For example, a line printer prints 1 to 132 digits.
It has 32 printing hammers 10, and currently, 304.
An 8” (12 inch) wide printing paper 11 is attached to the printing hammer 1.
Assuming that the paper is installed from the 10th digit to the 12020th digit of 0, the paper width detection mechanism 13 converts this paper width information into line 1.
3a to the test print control circuit 2. The test print control circuit 2 generates test print data based on the paper width information, a blank code for the 1st to 9th digits and 121st to 132nd digits, and a print data code for the 10th to 120th digits using a line 2a. A command is given to the test data generation circuit 4 via the . The test data generation circuit 4 generates blank codes for the 1st to 9th digits, print data codes for the 10th to 120th digits, and blank codes for the 121st to 132nd digits, and stores them in the print data memory 5 via IIa4a. send.

When one line of data is sent to the print data memory 5, a printing operation is executed in the same manner as in normal printing. In this case, the printing operation is executed only on the printing digits with printing paper installed, and printing on the printing digits with no printing paper installed is prohibited by the blank code, so blank printing can be prevented and the printing paper installed state The most suitable test printing will be performed. In this way, test data printing is automatically executed every time a certain number of lines are printed.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention includes a line counter circuit for counting the number of printed lines, a test print control circuit, and a test data generation circuit, and test printing is automatically performed every fixed number of lines. , it is possible to minimize recovery work when printing defects such as omitted characters occur.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. Explanation of symbols of main parts 1...Line counter circuit 2...Test printing control circuit 4...Test data generation circuit 5...Print data memory 6... Print code generation circuit 7... Comparison circuit

Claims (1)

[Claims] A printing control device in a line printer that successively compares the print data code and the print code corresponding to the movement position of the print character, and if they match, drives the print hammer of the relevant digit to print, and counts the number of lines printed. a test print control circuit that starts test printing based on the contents of the line counter circuit, a paper width detection mechanism that detects the width of printing paper installed in the line printer, and contents of the paper width detection mechanism. and a test data generation circuit that generates test data to be printed based on the commands of the test print control circuit.