JPS59176552U

JPS59176552U - Wire print head drive circuit

Info

Publication number: JPS59176552U
Application number: JP7046883U
Authority: JP
Inventors: 孝夫水谷
Original assignee: 沖電気工業株式会社
Priority date: 1983-05-13
Filing date: 1983-05-13
Publication date: 1984-11-26
Also published as: JPH0340608Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図はワイヤ印字ヘッドを示す片側半分を断面とした
側面図、第２図は第１図のＡ−Ａ線断面図、第３図はワ
イヤ印字ヘッドの先端部の拡大図、第４図は連続的に印
字されたトッドのピッチを示す説明図、第５図は従来の
ワイヤ印字ヘッドの駆動回路を示す回路図、第６図は従
来のワイヤ印字ヘッドの駆動回路において電磁コイルに
流れる電　　流と印字駆動素子を駆動する駆動用トラン
ジスタを導通させるタイミングを示す波形図、第７図は
磁束の方向を示す説明図、第８図は誘導磁束の磁束量を
示すグラフ、第９図は本考案によるワイヤ印字ヘッドの
駆動回路の第１の実施例を示す回路図、第１０図は第２
の実施例を示す回路図、第１１図は第１０図の単位回路
を駆動するパルスと電流の波形図である。２．２１〜２□４・・・コア、４，４□〜４□４・・・
電磁コイル、５・・・永久磁石、１１・・・アーマチュ
ア、１２゜１２１〜１２□４・・・印字ワイヤ、２７□
、２７．・・・２７２４・・・ドライブ用トランジスタ
、２８２，２８４・・・２８２４・・・リセット用１〜
ランジスタ、２９□、２９４・・・２９．４・・・リセ
ット用トランジスタ、３０□、３０４・・・３０２４・
・・ドライブ用トランジスタ、３１□。３１４・・・３１□４・・・ダイオード、３２□、３２
．・・・３２゜４・・・ダイオード、３３□、３３４・
・・３３゜４・・・ダイオード、３４□、３４４・・・
３４゜、・・・ダイオード、３５２、　３５４．　３５
８．　３５１０・・・駆動用トランジスタ、３６□・・
・駆動用トランジスタ、Ｄ１〜Ｄ４・・・ダイオード、
５ＣＲ１〜５ＣＲ４・・・サイリスタ。第２図第３図Fig. 1 is a side view of the wire print head with half of one side cut away, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is an enlarged view of the tip of the wire print head, and Fig. 4 is an explanatory diagram showing the pitch of tods printed continuously, Fig. 5 is a circuit diagram showing the drive circuit of a conventional wire print head, and Fig. 6 is a diagram showing the electric current flowing through the electromagnetic coil in the drive circuit of a conventional wire print head. Figure 7 is an explanatory diagram showing the direction of magnetic flux, Figure 8 is a graph showing the amount of magnetic flux of induced magnetic flux, and Figure 9 is a graph showing the timing of conducting the driving transistor that drives the printing drive element. A circuit diagram showing a first embodiment of the wire print head drive circuit according to the invention, FIG.
FIG. 11 is a waveform diagram of pulses and current that drive the unit circuit of FIG. 10. 2.21~2□4...core, 4,4□~4□4...
Electromagnetic coil, 5... Permanent magnet, 11... Armature, 12゜121~12□4... Printing wire, 27□
, 27. ...2724...Drive transistor, 282,284...2824...Reset 1~
Transistor, 29□, 294...29.4... Reset transistor, 30□, 304...3024...
...Drive transistor, 31□. 314...31□4...Diode, 32□, 32
．． ...32゜4...diode, 33□, 334・
...33゜4...diode, 34□, 344...
34°,...diode, 352, 354. 35
8. 3510... Drive transistor, 36□...
・Drive transistor, D1 to D4...diode,
5CR1 to 5CR4...thyristor. Figure 2 Figure 3

Claims

[Scope of utility model registration request]

A plurality of armatures each having a printing wire attached to its tip and whose rear end is supported by a leaf spring, a permanent magnet that is attracted to a core located on the back side of the armature, and an electromagnetic coil that releases the armature from the core. The printing drive elements are arranged in a circle, and the printing wires attached to each armature are arranged in two rows at the tip of the head,
This is a drive circuit for a wire print head that alternately drives electromagnetic coils corresponding to the print wires in each column during the armature release and suction process, and includes two diodes connected in series in a direction that is non-conductive to the power supply. The connected diode group and the switching element group each consisting of two switching elements connected in series are connected in parallel to a power supply, and the midpoint of one diode group and the switching element group is connected to one end of the electromagnetic coil. It has one unit circuit for each printing drive element, in which the midpoint of the other diode group and the midpoint of the switching element group are connected to the other end of the electromagnetic coil. For the print drive elements near the boundary between the print drive element group corresponding to the first row of print wires and the print drive element group corresponding to the second row of print wires, the three switching elements of each unit circuit are A drive element group that drives each independently, and one drive element that commonly drives the remaining one switching element are provided.For the other printing drive elements, two switching elements of each unit circuit are provided. 1. A drive circuit for a wire print head, comprising a drive element group that drives each element independently, and two drive elements that commonly drive the remaining two switching elements.