JPH02108029U

JPH02108029U -

Info

Publication number: JPH02108029U
Application number: JP1627989U
Authority: JP
Priority date: 1989-02-16
Filing date: 1989-02-16
Publication date: 1990-08-28
Anticipated expiration: 2004-02-16
Also published as: JPH0716437Y2

Description

[Brief explanation of drawings]

第１図は本考案によるワイヤドツト印字ヘツド
の一実施例を示す要部斜視図、第２図は同実施例
の分解斜視図、第３図は部品の一部を取り除いた
正面図、第４図は第３図の―線断面図、第５
図は第３図の―線断面図、第６図は従来のワ
イヤドツト印字ヘツドの断面図、第７図は第８図
のＡ―Ａ線断面図、第８図は従来のワイヤドツト
印字ヘツドの要部斜視図である。１４……ベースプレート、１５……コア、１６
……コイル、１７……バツクポール、１８……永
久磁石コイル、１７……取り付けプレート、２３
ａ……第１の磁石アセンブリ、２３ｂ……第２の
磁石アセンブリ、２４……スペーサ、２６……印
字ワイヤ、２７……アーマチユア、２８……板バ
ネ。 Fig. 1 is a perspective view of essential parts showing an embodiment of the wire dot printing head according to the present invention, Fig. 2 is an exploded perspective view of the same embodiment, Fig. 3 is a front view with some parts removed, and Fig. 4. is a sectional view taken along the line - in Figure 3, and Figure 5.
The figure is a sectional view taken along the line -- in Fig. 3, Fig. 6 is a sectional view of a conventional wire dot printing head, Fig. 7 is a sectional view taken along the line A-A in Fig. 8, and Fig. 8 is a main part of a conventional wire dot printing head. FIG. 14... Base plate, 15... Core, 16
... Coil, 17 ... Back pole, 18 ... Permanent magnet coil, 17 ... Mounting plate, 23
a...First magnet assembly, 23b... Second magnet assembly, 24... Spacer, 26... Printing wire, 27... Armature, 28... Leaf spring.

Claims

[Claims for Utility Model Registration] A plurality of armatures each having a printing wire attached to their tips and arranged in a circle with the tips facing in the centripetal direction, a leaf spring supporting each armature at its free end, and a core. and a coil wound around the core,
The electromagnets are arranged in a circle corresponding to each armature, and each armature is attracted to the core of the electromagnet during non-printing to give a deflection to the leaf spring, and the coil of the electromagnet is selectively excited during printing. In the wire dot printing head which opens the corresponding armature and drives the printing wire together with the armature by the restoring force of the leaf spring, a back pole made of a magnetic material is arranged outside the row corresponding to the core of each electromagnet; A base plate made of a magnetic material, which is provided with at least every other electromagnetic core arranged as shown in FIG. a first magnet assembly comprising a core provided on the base plate and a back pole provided on the permanent magnet; forming a second magnet assembly comprising a core provided therein, the loops of magnetic flux emanating from the permanent magnet and passing through the first and second magnet assemblies being oriented with respect to each other to cause each armature to be attracted to the core of the electromagnet; A wire dot printing head characterized in that it is oriented in opposite directions.