JPS6135954A - System for detecting printing control abnormality - Google Patents

Abstract

PURPOSE:To make it possible to detect the abnormality of printing control only by adding a simple check circuit, in a voting card dispenser, by comparing the content of the register in a printing head with fed-out data after printing operation. CONSTITUTION:The feed-out data to a thermal head 2 is simultaneously fed out even to the shift register 11 in a check circuit 10 and, when the data of a second line is fed out to the thermal head 2 after the data of a first line was finished, the data of the first line hitherto received in a shift register 5 is pushed out to be inputted to a shift register 13. At this time, the content of the shift register 11 is transferred to the next stage shift register 12 and compared with the content of the shift register 3 by a comparing circuit 14 and, if both contents coincide, an OK signal is returned to a printing control part 3 and, if not coincide, a NG signal is returned. The printing control part 3 stops printing upon the reception of the NG signal and discards the voting card (pari-mutuel ticket).

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a printing device, and particularly to a method for detecting printing abnormalities in a printing device in, for example, a voting ticket vending machine.

(b) Dot printing using conventional techniques. FIG. 2 is a block diagram of a conventional printing section, in which 1 is a control section, 2 is a thermal head, and 3 is a block diagram of a conventional printing section.
4 is a print data memory, 5 is a shift register SR, and 6 is a driver DV.

7 is a data transfer instruction line, and 8 is a serial data line.

9 is a print instruction line.

When a print command is issued from a circuit section (not shown), a data transfer instruction is issued from the print control section 3 to the print data memory 4, and one line of serial data is sent to the thermal head 2. The thermal head 2 has a shift register 5 for one line, into which data is set. Then, when a print instruction is issued from the print control unit 3, the driver 6 is energized and one line of data is printed on the paper.

FIG. 3 is a time chart of the conventional method. In FIG. 0, the period marked with an x in the J shift register column indicates that there is a certain period.

(c) Problems to be solved by the invention According to the conventional control method, since there is no check to see if one line of data has been printed correctly, some noise may cause the data to be set correctly in the shift register in the thermal head. If this happens, for example, a printed ticket with line misalignment will be issued.

When such line misalignment occurs, it is necessary to detect it, discard the ticket printed at that time, and retry printing again to issue a correctly printed ticket.

In a vending machine operated by an operator, the operator can visually check and try again, but it is difficult to completely prevent printing mistakes.

Furthermore, this point has become an even more important problem with automatic vending machines that are being used in recent years.

(d) Means for Solving the Problems In order to solve the above problems, the present invention includes a print data memory that holds print data, and a print data memory that holds l print units of print data sent from the print data memory. In a printing apparatus including a print data register, a driver circuit that prints data held in the print data register, and a print control section that controls the print data memory and driver circuit section, the print data is transferred from the print data memory to the print device. a pre-print data register that holds the same data as the data sent to the data register; a printed data register that receives and holds the contents of the print data register after the print operation by the driver circuit section; The present invention is characterized in that it includes a comparison circuit section that compares the contents of the printed data register with the contents of the printed data register, and is configured to send the comparison result by the comparison circuit section to the print control section.

(E) Function The present invention retains the same data as the data sent to the print head, and compares the contents of the register in the print head with the sent data after the printing operation to send the data to the print bed. It is designed to check whether the data is correct and set in the register in the print head.

(f) Embodiment FIG. 1 is a block diagram of an embodiment according to the present invention.
In the figure, 1 to 9 are the same as those in Fig. 2 above, 10 is a check circuit, 11 is a shift register (A) in series manual power-parallel output format, and 12 is a register (B) in parallel manual power-parallel output format. , 13 is a serial manual-parallel output type shift register (C).

14 is a comparison circuit, and 15 is a comparison result signal line.

The difference from the conventional example shown in FIG. 2 is that a check circuit 10 is added and a shift register 5 in the thermal head 2 is
The point is that the output from the final stage is taken out and inputted to the check circuit 10.

First, the data sent to the thermal head 2 is also sent to the shift register 11 in the check circuit 10 at the same time. After printing the first line of data, when the second line of data is sent to the thermal radar 2, the first line of data that had been in the shift register 5 is pushed out, and the check circuit 10 shift register 13 in
is input to.

At this time, check the circuit at the same time! The contents of the shift register 11 within θ (first line data) are transferred to the register 12 at the next stage. Then, the contents of the register 12 and the shift register 13 are compared by a comparison circuit 14.

As a result, if they match, the comparison result signal line 15 outputs
The K flaw signal is sent back to the print control unit 3, and if they do not match, it is determined that a printing defect has occurred and an NG signal is sent back.

When the printing control section 3 receives the NG signal, it stops printing, discards the voting ticket, and starts the retry printing operation again when the processing is completed.

FIG. 4 is a time chart of the embodiment.

(G) Effects of the Invention According to the present invention, it is possible to detect abnormalities in printing control by simply adding a simple check circuit, and the practical effects thereof are significant. In the embodiment, the present invention was applied to a voting ticket vending machine having a heat-sensitive heater, but it is clear that the present invention is not limited thereto.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment according to the present invention. FIG. 2 is a block diagram of the conventional system, FIG. 3 is a time chart of the conventional system, and FIG. 4 is a time chart of the embodiment. In FIG. 1, 1 is a control unit, and 2 is a thermal head. 3 is a print control unit, 4 is a print data memory, 5 is a shift register, 6 is a driver, 10 is a check circuit, 11 is a shift register, 12 is a register, 13 is a shift register, and 14 is a comparison circuit. Eido figure $1 figure

Claims (1)

[Claims] a print data memory that holds print data; a print data register that holds print data for one print unit sent from the print data memory; and a driver circuit unit that prints the data held in the print data register. , a printing device including the print data memory and a print control unit that controls the driver circuit unit, a pre-print data register that holds the same data as the data sent from the print data memory to the print data register;
a printed data register that receives and holds the contents of the print data register after the printing operation by the driver circuit section; and a comparison circuit section that compares the contents of the pre-print data register with the contents of the printed data register;
A printing control abnormality detection method, characterized in that the comparison result by the comparison circuit section is configured to be sent to the printing control section.