JPS63179777A - Printing controller for line printer - Google Patents

Abstract

PURPOSE:To enable optimum maintenance and replacement operations and contrive enhancement of printing quality and reliability and a reduction in maintenance cost, by providing a type history memory having a nonvolatile storage function for storing the count of the number of printing actions for each type, a memory-controlling circuit, a read switch and a clear switch. CONSTITUTION:With a read switch 6 being depressed, a memory-controlling circuit 7 outputs, for printing, the contents of a type history memory 10 for all types. For this purpose, a read signal 7a is applied to a terminal AD1 of a type history memory address generating circuit 8, a read/write terminal of the memory 10 and a printing control terminal of a printing circuit 11. In response to this, the circuit 8 generates memory addresses for all types, and applies the addresses to the memory 10. An output read from the memory 10 is printed by the printing circuit 11. Thus, it is made possible to know the use history of each type, namely, the number of times the type has been used for printing. A type band is replaced, and the content of the type history memory is cleared by pressing a clear switch 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a print control device for a line printer, and in particular to a printing control device for a line printer, which counts and stores the number of prints of a type on a type drum or a type band for each type. The present invention relates to a print control device for a line printer.

[Conventional technology]

Conventional print control devices for line printers do not have a function to count the number of times a type is used, and the usage history of the total number of times each type on a type drum or band has been printed cannot be known at all.

[Problem that the invention seeks to solve]

For this reason, optimal maintenance and replacement work for the type drum or type band cannot be performed, which adversely affects print quality, reliability, maintenance costs, and the like.

The present invention eliminates such problems and provides a print control device for a line printer that counts the number of times each type is printed and records this number for each type so that the usage history of each type can be known. It provides:

[Means for solving problems]

The line printer control device of the present invention includes a comparison circuit that sequentially compares a print data code and a print code, a print count circuit that counts the number of prints for each print character based on a match signal from the comparison circuit and the print code, and A type history memory with a non-volatile memory function that stores the count results of the count circuit for each type, and a type history memory read/write function.
It has a memory control circuit for controlling W entry, a reed switch for reading the contents of the print history memory, and a clear switch for clearing the contents of the print history memory.

[lol example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The line printer stores one line of print data sent from an external data source 1 into a print data memory 3 via a line 1a. On the other hand, a synchronizing pulse (not shown) which is output in synchronization with the moving position of the type is applied to the type code generator 2 via the line 2a, and this pulse is always applied to the type code generator 2 before the printing norm. The type code that corresponds to the incoming type is printed. Upon receiving one line of print data, the comparison circuit 4 connects the print data memory 3 and the print code generator 2.
If they match, a match signal is applied to the count terminal of the memory control circuit 7. Also, type code generator 2
The output of is also applied to the AD2 terminal of the print history memory address generation circuit. As a result, each type code is converted into an address corresponding to each type character in the type history memory 10, and the address is added to the type history memory 10. A match signal applied to the count terminal of the memory control circuit 7 causes the print history memory read signal to read/write the print history memory 10.
The contents of the address specified by the line 8a are added to the write terminal and read out from the print count circuit 9\C via the line 9a. 1 is added to the read content and written to the same address as above.

These operations mean adding 1 to the contents of the printed character H history memory of the matched printed character, which means that the number of times each printed character has been printed is counted up and stored.

The print history memory 10 is stored when the line printer device is powered on/off.
Since it has a non-volatile memory function so that its contents do not change when it is off, it is possible to keep a history of the number of times it has been printed.

Further, the type history memory 10 can be read from the outside, and the contents can be printed out to oneself.

That is, when the reed switch 6 is pressed, the read signal is applied to the lead terminal of the memory control circuit 7, and the memory control circuit 7 sends the read signal to the printout via the line 7a in order to print out the contents of the print history memory 10 for all print characters. It is applied to the ADZ terminal of the history memory address generation circuit 8, the read/write terminal of the print history memory 10, and the print control terminal of the print circuit 11.

As a result, the print history memory address generation circuit 8 generates memory addresses for all print characters, and adds them to the print history memo IJIOK. The output read from the type history memory 10 is printed by the printing circuit 11. This allows us to know the usage history of how many times each character was printed.

-Also, when a certain type reaches the specified number of printings, it is necessary to replace the type drum or type band and clear the contents of the type history memory for all type, but this is done by pressing the clear switch 5. It will be done.

〔Effect of the invention〕

As explained above, the present invention provides a print count circuit that counts the number of times each print character is printed in each line of a line printer, and a print history that has a nonvolatile memory function that stores the count results for each print character. By providing a memory control circuit, a reed switch, and a clear switch, the usage history of each type can be seen, and maintenance and replacement work can be performed using the optimum table, improving print quality and reliability. Maintenance costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

Claims (1)

[Claims] It has a comparison circuit that sequentially compares a group of print data codes sent from a data source and a group of print codes determined according to the moving position of the print character in response to a print command, and the comparison circuit allows the print data code and the print code to be compared. In a line printer that drives a printing hammer if they match, a print count circuit that counts the number of times each print character is printed and a count result of the print count circuit are calculated based on the match signal from the comparison circuit and the print code. a print history memory having a non-volatile writing function for storing each print character; a memory control circuit for controlling reading/writing of the print history memory; a reed switch for reading the contents of the print history memory; 1. A print control device for a line printer, comprising a clear switch for clearing the contents of a print history memory.