JPS61262165A - Printing control apparatus - Google Patents

Abstract

PURPOSE:To eliminate the blind typing of a printing figure having no printing paper mounted thereto, by detecting the width of printing paper and generating test data in connection with the width information of said printing paper. CONSTITUTION:When the test switch 1 of a line printer is pushed, a test printing start 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 13 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 15. When one line data is sent, printing operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing side tI1gi@, and particularly to a printing 11 control device for a line printer having a test printing function.

1 m Conventionally, line printer print control devices do not have a test printing function, or even if they do, the test pattern printed out is always the maximum printable digit of the device, regardless of the width of the printing paper installed in the line printer. It was printed on a number or a fixed area.

For this reason, if you perform test printing when using narrow printing paper, a so-called blank printing phenomenon occurs in which printing occurs where there is no printing paper, which adversely affects the lifespan of the printing hammer, type drum, and ink ribbon. was giving.

1. Accordingly, it is an object of the present invention to provide a printing control device that does not cause the blank printing phenomenon during test printing.

The line printer field printing control device of the present invention successively compares the print data hood group and the print code group determined according to the moving position of the print characters, and if the print data code and the print code match, A printing control device that drives a printing hammer of the digit to print, and includes a test switch for starting test printing, paper width detection means for detecting the width of printing paper installed in a line printer, and a test switch. The present invention is characterized by comprising a test print control circuit that controls test printing in response to the test print control circuit and the paper width detection means, and a test data generation circuit that generates test data to be printed based on commands from the test print control circuit.

K-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, during normal operation, one line of print data sent from external data source 3 is stored in print data memory 5 via line 3a. On the other hand, the type drum 15 rotates at a constant speed, and a synchronous pulse output in synchronization with the moving position of the type is detected by the synchronous pulse detection mechanism 14 and applied to the type code generation circuit 6 via l1114a. 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 drive circuit 9 drives the printing hammer 10,
The print hammer 10 strikes the type on the type drum 15 via the print paper 11 and the ink ribbon 12 to perform printing.

Next, the test printing function will be explained. When the operator presses the test switch 1 of the line printer, the signal is applied to the test print Ill 111 circuit 2 via the line 1a, resulting in a request to start test printing.

On the other hand, the width (in the horizontal direction) of the printing paper 110 loaded in the line printer is detected by the paper width detection mechanism 13 .

For example, a line printer has 13 digits from 1 to 132.
It has two printing hammers 10, currently 304.8a.
(inch) wide printing paper 11 is the printing hammer 10.
Assuming that the paper is installed at the 12020th digit from the 12020th digit, the paper width detection mechanism 13 applies this paper width information to the test print control circuit 2 via l113a. Test printing lesson i
Circuit 2 prints test print data based on paper width information.
The test data generation circuit 4 is instructed via the line 2a to generate blank codes for the 9th to 9th digits and 121st to 132nd digits, and print data codes for the 10th to 120th digits. The test data generation circuit 4 generates blank codes for 1st to 9th digits, print data hoods for 10th to 120th digits, blank codes for 121st to 132nd digits,
It is sent to print data memory 5 via line 4a.

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 performed only on the printing digits with the 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 operation can be performed even if the printing paper is installed. The most suitable test printing is performed.

11 Rikuo 1 As explained above, the present invention detects the width of the print paper loaded in the line printer and generates test data in conjunction with this information, so that the width of the print digits where no print paper is loaded is detected. Printing is prohibited, no blank printing occurs, and the lifespan of the printing hammer, type drum, and ink ribbon can be improved.

[Brief explanation of drawings]

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

Claims (1)

[Claims] Printing in a line printer that successively compares the print data code group and the print code group determined according to the moving position of the print character, and if the print data code and the print code match, prints by driving the printing hammer of the relevant digit. The control device includes a test switch for starting test printing, paper width detection means for detecting the width of printing paper mounted on the line printer, and a control device responsive to the test switch and the paper width detection means. A printing control device comprising: a test printing control circuit that controls test printing; and a test data generation circuit that generates test data to be printed according to commands from the test printing control circuit.