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Circuit for driving point impact head

A technology of impact head and driving point, which is applied in printing and other directions, and can solve problems such as reducing printing quality

Inactive Publication Date: 2010-05-12
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a current path is formed, an induced current is caused to flow to the head coil 22a, which provides resistance to the return operation of the head needle braked by the head coil 22a, thereby deteriorating the printing quality.

Method used

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  • Circuit for driving point impact head
  • Circuit for driving point impact head
  • Circuit for driving point impact head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Such as image 3 As shown, the head drive circuit 30 according to the first embodiment of the present invention includes: FET (p-channel type) 31; head coils 32a, 32b, 32c; FETs (n-channel type) 33a, 33b, 33c; diode 34; Diodes 35a, 35b, 35c; power supply circuit 36; and induction current cutoff circuit 37. The FET 31 is controlled by the control port H, while the FET 33 is controlled by the control ports La, Lb, Lc respectively. In this embodiment, for convenience of explanation, three head coils 32a, 32b, 32c are used as driving members; however, it goes without saying that the number of head coils can be arbitrarily set according to the number of points required for a point impact head.

[0045] The source terminal of FET 31 is connected to power supply circuit 36 ​​, its gate terminal is connected to control port H, and its drain terminal is ...

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PUM

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Abstract

A circuit for driving a head pin of point impact head. The point impact head driving circuit comprises a first head coil and a second head coil for operating the head pin. A first controlling elementcontrolls the current of a first terminal flowing through each head coil. Each second controlling element controlls the current of a second terminal flowing through corresponding head coils. A firstcircuit returns avalanche energy from reverse potential to the power source circuits and the avalanche energy is produced by activating at least a head coil. A second circuit returns the avalanche energy from reverse potential to the power source circuits. A third circuit is activated when activating the first contrilling member.

Description

technical field [0001] The present invention relates to a drive circuit (hereinafter referred to as a head drive circuit) for driving a dot impact head including an induction current cut-off circuit. Background technique [0002] In a printer employing a dot impact head, current flows through the head coil, and the iron core provided in the head coil is operated by the magnetic attraction force generated in the head coil so that when the head needle (printing needle) coupled with the iron core comes Printing occurs when the print media is impacted. [0003] figure 1 An example of a conventional head drive circuit 10 is shown. Specifically, this is a circuit configuration in which the current flowing through the head coils 12a, 12b, and 12c is controlled by the power-side control element 11 and the ground-side control elements 13a, 13b, 13c. The control signal supplied from the control port H controls the power supply side control element 11 so that the power supply side c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/22
Inventor 冈本忠之
Owner SEIKO EPSON CORP