JPH06179264A - Control device of dot impact printer - Google Patents

Abstract

PURPOSE:To lower a peak current by lowering noise at the time of printing, by a method wherein a plurality of common phase control circuits for driving pin of a corresponding printing head by starting operation by a specific output signal is provided. CONSTITUTION:When an impact starting signal 7 is turned on, an impact cycle counter 1 putout a pulse signal having a cycle of a preset time as an impact cycle signal 10 and operations of dispersion counter circuits 2a-2d are triggered. The dispersion counter circuits 2a-2d count time differences established respectively independently and dispersion signals 11a-11d are putout respectively at the time of completion of the counting. When the dispersion signals 11a-11d are applied to the common phase control circuits 3a-3d through the corresponding dispersion counter circuits 2a-2d, the common phase control circuits 3a-3d apply common phase control signals 9a-9d to corresponding pins and they are operated. With this construction, the pins are operated at their time differences, noise at the time of printing becomes low and a peak current also becomes low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot impact printer controller for driving pins of a print head of a dot impact printer.

[0002]

2. Description of the Related Art A print head of a dot impact printer employs a structure in which a plurality of pins 12 are linearly arranged vertically as shown in FIG. The dot impact printer control device simultaneously operates a plurality of common phase control circuits according to the timing of the impact cycle signal output from the impact cycle counter, and controls all pins 12 to impact at the same timing.

[0003]

As described above, in the conventional dot impact printer, since all the pins of the print head make impact at the same time, the impact sound increases as the number of pins operating at the same time increases. There is a drawback that the noise at that time is large. Further, since all the pins make an impact at the same time, there is a problem that the peak current during printing becomes high.

[0004]

A control device for a dot impact printer according to the present invention starts an operation by an impact start signal and outputs an impact cycle signal, and an impact cycle counter that starts an operation by the impact cycle signal. A plurality of distributed counter circuits that output distributed signals when a predetermined time of different values have passed, and output signals of the corresponding distributed counter circuits that are provided corresponding to the plurality of distributed counter circuits, respectively. A plurality of flip-flops for stopping the count operation of the corresponding distributed counter circuit from the input to the input of the impact cycle signal, and the corresponding distributed counter provided corresponding to each of the plurality of distributed counter circuits. The output signal of the circuit starts operation and the corresponding print head And a plurality of common phase control circuit for driving the pin.

[0005]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a waveform diagram showing the operation of the embodiment of FIG. 1, and FIG. 3 is a print head of a dot impact printer driven by the embodiment of FIG. It is a figure which shows an example of a pin, (a) is a front view,
(B) is an enlarged front view of a P portion.

In FIG. 1, the impact cycle counter 1
The reference cycle time is preset by the impact cycle data 5, and the counter clock 8 is counted to output the reference time of the impact cycle of the pins of the print head. The impact cycle counter 1 starts its operation when the impact start signal 7 is turned on, outputs an impact cycle signal 10 which is a pulse signal having a cycle of a time T set by the impact cycle data 5, and the impact start signal 7 is turned off. Then, the output of the impact cycle signal 10 is stopped.

The four distributed counter circuits 2a to 2d correspond to the pins 12a to 12d belonging to different groups of the print head as shown in FIG. 3B, and are counters for counting the time difference between them. is there. They are,
The time differences a to d are set in advance by the respective dispersion counter data 6a to 6d.

The distributed counter circuits 2a to 2d count the counter clock 8 with the impact cycle signal 10 from the impact cycle counter 1 as a reference until time differences a to d are output, and output distributed signals 11a to 11d, respectively.

The distributed counter circuits 2a to 2d are also respectively flip-flops (F / F) 4a in order to output a pulse signal once in one cycle of the impact cycle signal 10.
4d are connected, and distributed counter circuits 2a to 2d, respectively.
When there is an output from, the counting operation is stopped until the next impact cycle signal 10 is input.

The dispersion counter circuits 2a to 2d can individually set the time differences a to d. Therefore,
By providing the same number of distributed counter circuits as the number of pins 12 of the print head, it is possible to correspond to the individual pins 12.

The common phase control circuits 3a to 3d output the common phase output signals 9a to 9d to the corresponding pins 12a to 12d of the print head by using the dispersion signals 11a to 11d as start triggers to perform the impact operation. .

Next, the operation of the control device for the dot impact printer configured as described above will be described.

When the impact start signal 7 is turned from OFF to ON, the impact cycle counter 1 outputs a pulse signal having a cycle of a preset time T as an impact cycle signal 10, and the distributed counter circuits 2a ...
Trigger the 2d action.

The dispersion counter circuits 2a to 2d count the time differences a to d set individually, and when the counting is finished, the dispersion signals 11a to 11d are respectively generated.
Is output.

The common phase control circuits 3a to 3d receive the dispersion signals 11a to 11 from the corresponding dispersion counter circuits 2a to 2d.
When d is input, common phase output signals 9a to 9d are output to the corresponding pins 12a to 12d to operate them.

As a result, since the pins 12a to 12d operate with the time differences a to d, respectively, the noise during printing is reduced and the peak current is also reduced.

[0018]

As described above, the control device for a dot impact printer according to the present invention divides a plurality of vertically linearly arranged pins into a plurality of groups, and a plurality of commons corresponding to the plurality of groups. Phase control circuit and multiple distributed counter circuits corresponding to each common phase control circuit are provided, different time differences are set for each distributed counter circuit, and multiple distributed counter circuits are simultaneously driven by the impact cycle counter and set for each. The time difference you made is counted,
By outputting the dispersion signal at the end of counting and operating the corresponding common-phase control circuit, there is an effect that the pins of the print head can be operated with a time difference, and therefore the noise during printing is reduced. There is an effect that it can be made small and the peak current can be made low.

[Brief description of drawings]

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

FIG. 2 is a waveform chart showing the operation of the embodiment of FIG.

FIG. 3 is a diagram showing an example of pins of a print head of a dot impact printer driven in the embodiment of FIG. 1, (a)
Is a front view, and (b) is an enlarged front view of a P portion.

[Explanation of symbols]

 1 Impact cycle counter 2a to 2d Distributed counter circuit 3a to 3d Common phase control circuit 4a to 4d Flip-flop (F / F) 5 Impact cycle data 6a to 6d Distributed counter data 7 Impact start signal 8 Counter clock 9a to 9d Common phase output Signal 10 Impact cycle signal 11a to 11d Distributed signal 12 ・ 12a to 12d Pin

Claims (2)

[Claims] 1. An impact cycle counter which starts an operation by an impact start signal and outputs an impact cycle signal, and a dispersion signal when an operation is started by the impact cycle signal and a predetermined time of different values has passed. A plurality of distributed counter circuits for outputting, and a plurality of distributed counter circuits which are provided corresponding to each of the distributed counter circuits and start operation in response to output signals of the corresponding distributed counter circuits to drive corresponding pins of the print head. A controller for a dot impact printer, comprising: a common phase control circuit. 2. An impact cycle counter which starts an operation by an impact start signal and outputs an impact cycle signal, and a dispersion signal when an operation is started by the impact cycle signal and predetermined times of different values have passed. A plurality of distributed counter circuits for outputting and a plurality of distributed counter circuits provided corresponding to each of the distributed counter circuits and corresponding from the input of the output signal of the corresponding distributed counter circuit to the input of the impact cycle signal A plurality of flip-flops for stopping the counting operation of the distributed counter circuit; and a plurality of flip-flops provided corresponding to the plurality of distributed counter circuits. A plurality of common phase control circuits for driving pins are provided. Control device for dot impact printer.