JPS5845351B2 - wire dot printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wire dot printer that allows smooth movement of a printing wire.

In conventional wire dot printers, during printing, ink from the ink ribbon enters the gap between the wire guide and the printing wire near the tip of the printing wire.

For this reason, when the printing wire is in continuous operation, the viscosity of the ink is low and the printing wire moves smoothly, but if it remains inactive for a certain period of time, for example several hours at hot temperatures, the viscosity of the ink becomes low. This has the disadvantage that the printing wire does not operate smoothly, does not immediately respond to printing signals, and does not operate.

Therefore, the present invention uses a data present signal received prior to a print signal to move the print wire within a range that does not result in printing, thereby pushing the highly viscous part of the ink out of the wire guide, and moving the print wire. This is to facilitate the process.

An embodiment of the present invention will be described below with reference to the drawings.

The figure is a block diagram showing an embodiment of a wire dot printer according to the present invention.

In the figure, 1 is a character generator that receives print data and emits a signal corresponding to the dot font, and 2 is a timer that detects that no printing has been performed for a certain period of time after the last printing and outputs a non-printing signal. As a result of experiments, it was found that good results could be obtained by adjusting the output to be output in about 30 minutes at 0°C.

Therefore, if the temperature is different, it is desirable to be able to adjust the output time.

3 is driven by the combination of the data present signal added and transmitted before the print data and the non-printing signal from the timer 2, and magnets 8a to 8n are excited for a minute time during which the printing wire does not print. With a pulse generator, e.g. 4 to 5 pulses of 200 μsec are generated.
It outputs times.

4 is for example 600mm applied to magnets 8a to 8n in order to receive a magnet drive trigger pulse and perform predetermined printing.
Magnet print impact pulse generator that outputs μsec pulses, 5a to 5n are magnets 8a
Drive transistors provided corresponding to ~8n, 6a~
6n and 9 are AND gates, and 7a to 7n and 8 are OR gates.

Next, the present invention will be explained in detail.

First, when a data present signal indicating a data transmission notice is received prior to print data, the signal is input to the AND gate 9.

At this time, timer 2 outputs an output if a certain period of time has passed after printing.
(It is desirable to select the optimal value as it will vary slightly depending on the temperature, humidity, ink ribbon used, etc.) When AND gate 9 is opened, the OR gate? a, 7b...7n
At the same time, a drive signal is sent to the pulse generator 3.

Therefore, the pulse generator 3 operates, e.g.
sec pulses are intermittently output five times.

In this example, a pulse of 200μSeC is output five times, but depending on the situation, the pulse generator 3 (or independently) can be configured to optimize the output time and number of outputs. An easy way to adjust is to provide a counter and output it once every time "■" is subtracted (added), and repeat the process until a predetermined value is reached.

The output of the pulse generator 3 is input via an OR gate 8 to AND gates 6a, 6b, . . . , 6n.

On the other hand, the outputs from the OR gates a, 7b...In are input to the AND gates a, 6b... 6n, respectively, so the AND gates 6a, 6b to 6n are opened, and their outputs are 1 drive transistor 5a, sb...
Applied to the base of 5n.

Therefore, all the magnets 8a, 8b...8
Since n is excited for a short time, the magnets 8a and 8b
...A wire (not shown) corresponding to 8n moves slightly.

In this embodiment, it is assumed that the fine movement of the wire (not shown) is repeated five times.

As a result, the viscosity of ink or the like that has been stuck in the gap between the wire (not shown) and the wire guide decreases or is pushed out, so that the print head completes printing preparation.

Next, upon receiving the print data, the character generator 1 sends a signal corresponding to the received data to the OR gate 7a.
, 7b...In to predetermined gates of AND gates 6a, 6b...6n.

On the other hand, the magnet print impact pulse generator 4 is operated by the magnet drive trigger pulse, and sends a signal of 6001 tsec, for example, to the AND gates 6a, 6b, . . . , 6n via the OR gate 8.

Therefore, the AND gate 6a according to the received character,
6b...6n are opened, their outputs are applied to the bases of predetermined drive transistors 5a, sb...5n, and predetermined magnets 8a, 8b...8n are driven by 1.

At this time, since the wire is already in a slidable state, it is possible to print completely from the first dot of the first character.

In addition, the printing method for dot characters is m from the 1st column to the m column.
Of course, it may be printed at once, or may be printed at once by providing an NXM dot printing function.

As described above in detail, according to the present invention, when restarting printing after a non-printing state continues for a certain period of time,
By slightly moving the print wire several times in response to the data present signal sent before the print data, and reducing the viscosity of the ink between the wire and the wire guide, the print data that is sent subsequently is It has the effect of being able to print completely from the first character.

Note that in this embodiment, the first pulse generator was provided independently, but the pulse generator that generates pulses for printing was provided at 200 pulse generators.
It goes without saying that it can be used in combination by being able to output pulses of about μsec and outputting them several times in succession during printing.

[Brief explanation of the drawing]

The figure is a block diagram showing one embodiment of the present invention. 1...Character generator, 2...
・Timer, 3...Pulse generator, 4...
・Magnetic print impact pulse generator,
5a-5n...drive transistor, 6a-6n
and 9...and gate, 7a~In and 8.
...or gate.

Claims (1)

[Claims] 1. A timer that detects that no print signal is received for a certain period of time and outputs a non-print signal, and a timer that drives the print wire toward the platen within a range that does not cause the print wire to print. and a pulse generator that applies an excitation pulse of minute duration to the print magnet, and when a data present signal is received while the non-print signal of the timer is being output,
A wire dot printer characterized in that the pulse generator is operated to move the printing wire within a range that does not lead to printing. 2 A number counter is set to a predetermined number along with the operation of the pulse generator, and the set number of the counter is subtracted by the output pulse of the pulse generator.
Wire dot printer as described in section.