JPH0372445U

JPH0372445U -

Info

Publication number: JPH0372445U
Application number: JP13435589U
Authority: JP
Priority date: 1989-11-21
Filing date: 1989-11-21
Publication date: 1991-07-22

Description

[Brief explanation of drawings]

第１図は本考案の実施例を示すワイヤドツト印
字ヘツドの断面図、第２図は本考案の他の実施例
のコイル部分拡大図、第３図は従来のバネチヤー
ジ型のワイヤドツト印字ヘツドの断面図、第４図
は従来の他のワイヤドツト印字ヘツドのコア部分
を示す図、第５図は吸引力の説明図、第６図は吸
引力と断面積の関係図、第７図はテーパ形状のコ
イルを有するワイヤドツト印字ヘツドの断面図、
第８図はテーパ形状のコイルの説明図である。４，２１……永久磁石、７……板バネ、１０…
…アーマチユア、１２……コア、１３……コイル
、１８……ボビン。 Fig. 1 is a sectional view of a wire dot printing head showing an embodiment of the present invention, Fig. 2 is an enlarged partial view of a coil of another embodiment of the invention, and Fig. 3 is a sectional view of a conventional spring charge type wire dot printing head. , Fig. 4 is a diagram showing the core part of another conventional wire dot printing head, Fig. 5 is an explanatory diagram of suction force, Fig. 6 is a diagram of the relationship between suction force and cross-sectional area, and Fig. 7 is a diagram of a tapered coil. a cross-sectional view of a wire dot print head having a
FIG. 8 is an explanatory diagram of a tapered coil. 4, 21... Permanent magnet, 7... Leaf spring, 10...
... Armature, 12 ... Core, 13 ... Coil, 18 ... Bobbin.

Claims

[Scope of claim for utility model registration] An armature with a printing wire fixed to the tip,
A core provided opposite the armature, a bias plate spring that fixes the armature and is supported in a cantilevered manner, and is wound around the core and generates magnetic flux when excited to rock the armature. In a wire dot printing head consisting of a moving coil, (a) the core has a shape whose cross-sectional area gradually decreases from the base side to the armature suction side, and (b) a bobbin for winding the coil is arranged to surround the core. (c) A wire dot printing head characterized in that the bobbin has a shape in which the cross-sectional area gradually decreases by at least two steps from the base side to the armature suction surface side.