JPS62179973A - Line printer - Google Patents

Abstract

PURPOSE:To obtain a line printer in which it is easy to know where to start a recovery processing when defective printing occurs, by automatically performing a test printing when a predetermined period of time passes. CONSTITUTION:A clock-generation circuit 16 generates clock pulses 16a with a fixed period, and when a predetermined period of time is counted by a timer circuit 1, a test printing request 1a is applied to a test printing controlling circuit 2. On the other hand, the width of a printing paper 11 set to a line printer is detected by a paper width detecting mechanism 13, and paper width information 13a is applied to the circuit 2. The circuit 2 commands a test data generating circuit 4 to generate printing data codes, and when data for one line are sent to a printing data memory 5, an optimum test printing conforming to the fitted condition of the printing paper is performed, and test data printing is automatically performed each time printing is performed for a predetermined period of time.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to a line printer.

;,Prior art-1 Conventionally, line printers do not use test I during printing operations.
・Printing operation was not performed.

[Problem that the invention seeks to solve]

With the conventional printers mentioned above, if a printing defect occurs (such as 9 missing characters) while performing a large amount of printing, it is difficult to know where to start the recovery process, so you have to start over from the beginning. However, this caused a great deal of damage to printing paper and computer usage time.

The present invention eliminates such problems, and provides a line printer that automatically executes test printing after a certain period of time, and allows you to easily know where to start recovery processing when a printing failure occurs. It provides:

1'Means for Solving Problems] The line printer of the present invention is characterized in that it performs test printing at regular intervals after the power is turned on.

The line printer of the present invention has a paper width detection P! that detects the width occupied by the printing paper in the printing unit that performs printing. & horizontal, and the face printing section can be configured to perform test I printing only on the digits corresponding to the printing paper.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a process diagram of an embodiment of the present invention.A nine-line printer stores one line of print data 3a sent from an external data source 3 in a print data memory 5. On the other hand, the type drum 15 rotates at a constant speed, and a synchronous pulse 14a output in synchronization with the moving position of the type is detected by the synchronous pulse detection fi Ji! 1-. 4. , $) are added to the printed code generation circuit 6. As a result, the printed character code generating 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,
The comparison result is added to shift I register 8 by f on line 7a.

The shift register 8 stores the comparison results of each print digit,
Its output is applied to hammer drive circuit 9.

The hammer driving circuit 9 drives the printing hammers 10, and each printing hammer 10 releases the printing paper 11 and the ink ribbon 12 only when the code of the corresponding printing code generation circuit 6 and the code of the printing data memory 5 match. Printing is performed by hitting the type characters on the type drum 15 via the type drum 15.

After the power is turned on, the tarlock generation circuit 16 generates a clock pulse 16a with a constant period, and the timer time i? Supply to 31. The timer circuit 1 is reset to zero when the power is turned on, and then counts tarok pulses 16a. Timer circuit 1
When counting a predetermined time (for example, 10 minutes), the last print request 1a is applied to the test I/print control circuit 2, and the timer circuit 1 is reset to zero.

On the other hand, the width (in the horizontal direction) of the printing paper '11 loaded in the line printer is detected by the paper width detection mechanism 13. For example, a line printer has 1 to 132 digits.
It has 32 printing hammers 10, currently 304.81
am (12 inches) wide printing paper 11 is printed by 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 detects this paper width information 1.
3a to the test print control circuit 2. Based on the paper width information 13a, the test print control circuit 2 outputs the test print data 2a to the 1st to 9th digits of the printing hammer 10 and the 121st to 9th digits of the printing hammer 10.
The test data generation circuit 4 is instructed to generate a blank code in the 132nd digit and print data codes in the 10th to 120th digits. The test data generation circuit 4 has digits 1 to 9.
A blank code is generated for the digits, a print data code is generated for the 10th to 120th digits, and a blank code is generated for the 121st to 132nd digits, and the print data is sent to the memory 5 via the line 4a.

When one line of data is sent from the test data generation circuit 4 to the print data memory 5, a printing operation is performed in the same manner as in the case of printing described above. In this case, the printing operation is performed only on the printing column to which the printing paper 11 is attached, and the printing paper 1
Since printing on a printing digit to which 1 is not installed is prohibited by a blank code, blank printing can be prevented and test printing can be performed in an optimal manner that matches the installation state of the printing paper. In this way, test data printing is automatically executed every time printing is performed for a certain period of time.

[Effects of the Invention] As explained above, according to the present invention, by performing test printing at regular intervals, it is possible to minimize recovery work when printing defects such as omitted characters occur.

Furthermore, by providing a paper width detection mechanism, it is possible to perform test printing that matches the mounting state of the printing paper.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Timer circuit, 2... Test print control circuit,
3... External data source, 1... Test data generation circuit, 5... Print data memory, 6... Print code generation circuit, 7... Comparison circuit, S... Shift register,
9... Hammer drive circuit, 10... Printing hammer, 11
...Printing paper, 12...Ink ribbon, 13...
Paper width detection mechanism, 14... Synchronous pulse detection mechanism, 15
...Type drum, 16...Clock generation circuit. Agent Patent Attorney Uchihara Oto;I”;・・＼−.

Claims (2)

[Claims] (1) A line printer characterized by performing test printing at fixed intervals after power is turned on. (2) Claim 1, further comprising a paper width detection mechanism for detecting the width occupied by the printing paper in a printing section that performs printing, wherein the printing section performs test printing only with the digits corresponding to the printing paper. line printer.