JPH0241257A - Remaining vibration preventing circuit for printing wire of electromagnetic printing head - Google Patents

Abstract

PURPOSE:To prevent a remaining vibration and to prevent excess dot from being printed by providing a circuit for detecting continuous dots, and feeding a small amount of positive current to a wire coil when a printing wire has effected printing and then returned as long as discrete dots are printed. CONSTITUTION:A pulse generator 106 is so constructed as to output a pulse 103 by the input of a basic clock 101 of odd number. Pulse detectors (continuous dot detectors)107-1 - 107-24 are provided at data sides (data 104-1 - 104-24), and a pulse is generated only when discrete dots are printed. Thus, when a printing wire is printed and then returned, a small amount of positive current flow to a wire coil 113, a printing wire deformation waveform is returned smoothly after printing to prevent a remaining vibration after printing. Accordingly, a phenomenon in which a printing is generated at a position not to be printed is eliminated to improve the quality of printing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an impact dot matrix printer having an electromagnetic print head, by preventing residual vibration (rebound) of the printing wire after printing, so that the printing wire can The present invention relates to a circuit for preventing unnecessary dots from being printed later, and particularly to a circuit for preventing residual vibration of a printing wire in an electromagnetic print head for improving printing quality.

[Conventional technology]

Conventionally, as a means for preventing residual vibration after printing with this type of printing wire, printing pressure has been adjusted mechanically.

For example, in order to prevent this residual vibration by optimizing the spring constant of the coil spring 304 shown in FIG. 3, which is a sectional view of the armature inside the print head, the armature 3
Measures were taken such as inserting a damper 302t between the 01 and the magnet 303.

[Problem to be solved by the invention]

The above-mentioned conventional means for preventing residual vibration of printing wires,
Since it is a mechanical treatment, it is structurally complex and has low reliability.

[Means to solve the problem]

The circuit for preventing residual imaging of a print wire in an electromagnetic print head of the present invention is a circuit for detecting continuous dots in order to prevent residual vibration of a print wire after printing in an impact dot matrix printer having an electromagnetic print head. When the printing wire returns after printing, a small amount of positive current is passed through the wire coil to soften the return of the printing wire. be.

[Effect]

In the present invention, by preventing residual vibration of the printing wire after printing, it is possible to prevent the printing wire from performing unnecessary printing on the driver 14 after printing.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention and a diagram showing a drive circuit of a conventional printer. Side A shows a circuit that generates applied pulses. The 7%B side is a representation of the drive circuit of a conventional printer.

On the A side of this wc1 diagram, 101 is an odd-numbered basic clock, 102 is an odd-numbered pulse, and 103 is a pulse obtained by the pulse generator 106. This pulse generator 10G outputs a pulse 103 by inputting the odd-numbered basic clock 101. is configured to do so. 1
04-1, 104-3, 104-5, 104=7
are data (1), data (3), data (5), data (7), 105-1, 105-3, 105-5,
105-7 is Nidol data (1), Nidol data (3)
, needle data (5), h with two dollars y'-ta<n. 1
07-1, 107-3, 107-5.107-7 are pulse detection circuits, and these pulse detection circuits 107-1 to 1
07-7 is a circuit for detecting continuous dots in order to prevent residual vibration (repound) of the printing wire after printing, and is configured to output pulses when printing non-continuous dots. 108 is data (1)
104-1 ~ Data (7) 104-7 When there is no human power,
It is a pulse generator that does not output applied pulses,
109 is data (1) 104-1 ~ data (7) 1
04-7 This is a pulse generator that outputs two dollar data (1) 105-1 to two dollar data (7) 10S-7 from human power.

On the B side of FIG. 1, 110 is a common side drive circuit, 111 is a data side drive circuit, 112 is a connector,
113 is a wire coil inside the print head.

In addition, in this Figure 1, a part of the odd wire side (
1, 3, 5, 7 pins), but the remaining odd numbered wires (9 to 23 pins) and even numbered wires (2 to 24 pins) are taken as an example.
The same applies to pins).

FIG. 2 is a time chart showing each pulse timing according to the conventional method and the present invention to provide an explanation of the operation shown in FIG. 1. FIG. ~204.

201 (CLKl) is divided into a common on the odd-numbered wire row side (odd-numbered basic clock 101') and a common on the even-numbered wire row side, each of which is shifted by a half cycle and always outputs full pulses during printing. 202 (CLK, ) is a pulse output of each data of the 1st to 24th bins (data (1) 104-1 to data (24) 104-24). 201 (CLKl) and 202 (CLK2) shown in this Figure 2
The common side drive circuit 110 in FIG.
, is driven by a data-side drive circuit 111, and current is applied to a wire coil 113 inside the print head to perform printing.

203 (I) shows the current flowing through the wire coil during conventional printing, 204 (h) shows the wire displacement waveform during conventional printing, and 205 (PLS) shows the applied pulse (pulse 103) generated by the present invention. , 206 (CLK1
') is 201 (C
LK, ), 207 (CLK2') are 9 202 (CLKz), 208 (I') to which the pulse (pulse 103) is added.
) is 203 when the pulse (pulse 103) is applied
(I), 209(h') shows 204(h) when a pulse (pulse 103) is applied. Then, the breath is applied pulses (pulse 10
3)? , b is the current flowing through the wire coil due to the applied pulse a, and C is the residual vibration 1-(
IJ bounce amount) and d indicate the amount of residual vibration after printing (rebound amount) reduced by the applied pulse according to the present invention.

The odd-numbered basic clocks 101 shown in FIG.
Corresponds to 201 (CLKI') in the figure, odd-numbered pulse 102 corresponds to 206 (CLKI') in Figure 2, and pulse 103 corresponds to the second
In 205 (PLS) of the figure, data 104-1 to 104-
24 is 202 in Figure 2 (CLK, two dollar pulse 10
5-1 to 105-24 are 207 (CLK,') in Figure 2
correspond to each.

The operation of the embodiment shown in FIG. 1 will now be described with reference to FIG. 2.

First, the block diagram shown on the A side of FIG. 1 is inserted into each line 1d (odd number basic clock, data, etc.). With this circuit, 201 (CLKl) in Fig. 2 is 206
(CLK, ')lrko, 202 (CLK snow) is 20
7 (CLK!'), 203 (I) changes to 208 (I'), and 204 (to 204) changes to 209 (h'), respectively.

In this case, if this applied pulse is generated while printing continuous dots, it will cause a delay in the printing response speed. The pulse detection circuit shown in Figure 1 (
Continuous dot detectors 107-1 to 107-24 are provided on each data side (data 104-1 to 104-24), and pulses are generated only when printing non-continuous dots. Further, the pulse generator 108 controls the data 104-1 to 104-24 so that the applied pulses are not output when there is no human power.

At the same time, due to the newly generated application pulse 1 in FIG. 2, the printing wire displacement waveform shown in 204(h) becomes 2.
As shown in 09(h'), there is a smooth return after printing,
The rebound width decreases from the residual imaging amount C to the residual vibration amount d (c>d). This is because when the applied pulse returns after printing on the printing wire, a small amount of positive current (
This is because the printing wire (direction of printing) flows and the printing wire makes a soft landing.

As described above, in the present invention, only when performing non-continuous double-travel printing, when the printing wire returns after printing, a small amount of positive current is passed through the wire coil to soften the return of the printing wire. has been done.

Therefore, by inserting the circuit shown on the side A in FIG. 1, the return of the printing wire after printing becomes smoother than before, and residual vibration (rebound) after printing can be prevented.

〔Effect of the invention〕

As explained above, the present invention prevents residual imaging of the printing wire after printing by inserting the circuit shown on the side A in FIG. 1 immediately before the conventional drive circuit shown on the side B in FIG. 1. Can be done.

This eliminates the phenomenon that previously had a negative impact on print quality, where the print wire would reach the ink ribbon due to residual capture, causing printing to occur in areas where it should not have been printed, improving print quality. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention and a diagram showing a drive circuit of a conventional printer, FIG. 2 is a time chart showing the timing of each pulse to explain the operation of FIG. 1, and FIG. 3 is a diagram showing a drive circuit of a conventional printer. FIG. 3 is a sectional view of an armature inside the print head. 101... Odd number basic clock, 102... Odd number pulse, 103... Pulse, 104-1 to 10
4-7...Φ data, 105-1 to 105-7 Φ
- e needle data, 106... pulse generator, 107-1 to 107-7... pulse detection circuit, 108, 109... pulse generator.

Claims (1)

[Claims] An impact dot matrix printer with an electromagnetic print head has a circuit that detects continuous dots in order to prevent residual vibration of the printing wire after printing,
Only when printing discontinuous dots, the electromagnetic type is characterized in that when the printing wire returns after printing, a small amount of positive current is passed through the wire coil to soften the return of the printing wire. Circuit to prevent residual vibration of the print wire in the print head.