JPS6399963A - Printing control circuit - Google Patents

Abstract

PURPOSE:To reduce processing time for software and improve the execution of printing speed by performing a thinning-out operation on continuous dot information by using hardware. CONSTITUTION:A dot information signal 10 is entered into a register 1 through a gate circuit 2, and another input signal through the gate circuit 2 is a signal which has passed through a gate circuit 3 with a high-speed printing mode control signal 14. If said signal is in 'active' state, the logic of contents stored in the register 1 is reversed and output, then it is subjected to a logic product arithmetic operation with a signal 10 at the gate circuit 2 and input in the register 1. Output data 11 from the gate circuit 2 contain no dots, if an output from the register 1 indicates contained dots, and also the signal 10 indicates contained dots. On the other hand, the output of the gate circuit 2 contains the same as the signal 10, if the output of the register 1 indicates no contained dots. The register 1 maintains the output of the gate circuit 2 and said output is used as a head drive signal. The operation is performed in accordance with a signal 12, and the signal 10 is temporarily stored by the register 1. At the same time, the signal 10 is compared to a next signal to thin out dots and the thinned-out dots are output as non-continuous dot information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a print control circuit used in a dot matrix printer. In particular, the present invention relates to a print control circuit that enables a print speed that is twice the response frequency of a print head.

〔overview〕

The present invention uses hardware to thin out consecutive dot information in a print control circuit used in a dot matrix printer, thereby improving printing speed even at the expense of some print quality. be.

[Conventional technology]

Conventionally, printing in high-speed printing mode has been performed using software to detect consecutive dots in a printed character pattern and thin out the consecutive dots, resulting in a non-continuous printed character pattern. Further, this process is performed every time one column is printed or one line before printing starts.

[Problem that the invention seeks to solve]

In this way, in the conventional example, continuous dots are detected by calculating the dot information and the next dot information using software immediately before or during printing of the - line, which increases the processing time of the software. The disadvantage is that the actual printing speed decreases.

In addition, as high-speed printing becomes faster, software processing time becomes a constraint on the printer's printing speed, and there is a need to shorten the software processing time, but this cannot be easily achieved and has the disadvantage of limiting printing speed. be.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and provides a print control circuit that can thin out continuous dot information using hardware instead of software.

[Means for solving problems]

The present invention provides a dot matrix printer with a
In a print control circuit that preprocesses dot information, when a register that temporarily stores the presence/absence status of dot information to be output to the dot matrix printer, and both this output dot information and the dot information subsequently input to this register are in the presence state. The present invention is characterized in that it comprises a logic operation means for changing the input dot information to no state, and a connection means for connecting the output of the logic operation means to the input of the register.

[Effect]

The previous dot information stored in the register is compared with the dot information subsequently input to the register, and if there is a dot in both, the input of this newly input dot information is prohibited and no dots are added to the register. Memorize information as nothing. The dot information stored in the register is sent to the dot matrix printer. This allows the same type of mechanism to be used to double the printing speed, at the expense of some print quality.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A circuit according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit connection diagram showing the configuration of a circuit according to an embodiment of the present invention, and is a circuit diagram for one wire in a print head. This circuit includes a register 1, a gate circuit 2,
The dot information signal 10 is a signal corresponding to the dot of the Nth pin of the character dot pattern, and indicates the presence or absence of a dot, and the output data timing signal 12
is a signal that has a predetermined period corresponding to the printing speed and scans the dot pattern in the horizontal direction, and controls the input/output to the register 1, and the high-speed printing mode control signal 14 is the signal that This is the number.

Now, the dot information signal lO is input to the register 1 via the gate circuit 2. The other input signal of the gate circuit 2 is a signal passed through the gate circuit 3 which receives the output high-speed printing mode control signal 14 of the register 1, and this signal is transmitted when the high-speed printing mode control signal 14 is in the active state. , the logic of the contents stored in the register 1 is inverted and output, and the gate circuit 2 outputs the dot information signal 10.
is ANDed and input to register 1. The output data 11 from the gate circuit 2 becomes no dot when the output of the register 1 indicates the presence of a dot and the dot information signal 10 indicates the presence of a dot, and when the output of the register 1 indicates the absence of a dot. , has the same content as the dot information signal 10. Register l is a register that holds the output of gate circuit 2, and the output is used as a head drive signal. This operation is performed in accordance with the output data timing signal 12, and the continuous dot information signal 10 is temporarily stored in the register 1, and is compared with the next dot information signal 10 to thin out the dots and remove the discontinuous dot information. Output as .

Note that FIG. 2 is a timing chart showing the operation of this circuit, and shows the case where the dot information shown in FIG. 3 is input.

〔Effect of the invention〕

As explained above, the present invention can reduce software processing time by thinning out consecutive dot information using hardware.
This has the effect of improving the actual printing speed.

[Brief explanation of the drawing]

FIG. 1 is a circuit connection diagram showing the configuration of a circuit according to an embodiment of the present invention. FIG. 2 is a timing chart showing the operation of the circuit according to the embodiment of the present invention. FIG. 3 is an explanatory diagram showing the operation of the circuit according to the embodiment of the present invention. 1...Register, 2.3...Gate circuit, 10...
・Dot information signal, 11... Output data, 12...
Output data timing signal, 13...reset signal,
14...High-speed printing mode control signal.

Claims (1)

[Claims] (1) In the print control circuit that pre-processes the dot information given to the dot matrix printer, there is a register (1) that temporarily stores the presence/absence of the dot information to be output to the dot matrix printer, and a register (1) that temporarily stores the presence/absence of the dot information to be output to the dot matrix printer, and Logical operation means (3
); and connection means (2) for connecting the output of the logic operation means to the input of the register.