【図面の簡単な説明】[Brief explanation of drawings]
第１図は従来のスプリングヂャージ式ドットラ、インプ
リンタの印字ヘッド、及びその使用形態を示す模式的斜
視図、第２図は印字ハンマの吸引力持性と板はねの復元
力の関係を示す図、第３図は、従来の印字ヘットを構成
する複数の印字ハンマの配置と各印字ハンマの吸引力の
関係を示す図、第４図は、従来の印字・＼ラドの各印字
ハンマの配置と吸引力を打ち消すのに必要な電流値の関
係を示す図、第５図は、本考案の印字ヘッドの構成概念
を示す部分斜視図、第６図は従来の印字ヘッドの等価回
路の一部を示す、第７図は、本考案の印字ヘッドの等価
回路の一部を示す、第８図は、本考案の他の一実施例を
示す印字ヘッドの部分斜視図、第９図は本考案の他の一
実施例を示す印字ヘッドの部分斜視図を示す。
図中各記号はそれぞれ次のものを示すを示す、１・・・
板ばね、２・・・ベース、３・・・固定板、４・・・ヨ
ーク、５・・・永久磁石、６・・・コイル、７・・・ハ
ンマピン、８・・・プラテン、９・・・インクリボン、
１０・・・印字用紙、１１・・・印字ハンマの吸引力特
性、１２・・・板ばねの復元力特性、１３・・・本考案
の磁気回路、１４・・・本考案による磁気回路と接する
駆動印字ハンマ、１５・・・側方ヨーク。
その他記号は次のものを示す、第２図において、Ｘ・・
・板ばねとヨーク先端の間隙、Ｘｏ・・・板ばねの撓み
が零になる占きの板ばね、ヨーク間の間隙、Ｆ・・・力
を示す、Ｆｍ・・・板ばねがヨークに吸着されたときの
吸引力の最大値、Ｆｏ・・・板ばわがヨークに吸着され
たときの復元力。
第３図、第４図において、ｎ・・・ラインプリンタを構
成する並列の印字ハンマの配置番号、Ｆｍ・・・吸引力
、■・・・吸引力を打ち消すためにコイルに流す電流。
第６図、第７図において、φ７．・・・永久磁石の発す
る磁束、φ、・・・板ばねの吸引部に流れる磁束、φｇ
ｓ・・・従来の印字ヘッドの両端の印字ハンマにおいて
板ばねの吸引部に流れる磁束、ｐｔ・・・永久磁石から
板ばねの吸引部に至るまでのパーミアンス、Ｐｇ・・・
板ばねの吸着部のパーミアンス、ＰＳ・・・従来の印字
ヘッドにある両端の印字ハンマにおける側面のパーミア
ンス、Ｐｏ・・・本考案の磁気回路における全パーミア
ンス。
゛」
’ ” ’ ４ Ｓ−一−−九−９’ｈ−Ｌ
Ｈ−ｌ ９ｔ。Figure 1 is a schematic perspective view showing the print head of a conventional spring-jerged dot printer and imprinter, and its usage. Figure 2 shows the relationship between the suction force of the printing hammer and the restoring force of the plate spring. Figure 3 shows the arrangement of multiple printing hammers constituting a conventional printing head and the relationship between the suction force of each printing hammer, and Fig. 4 shows the arrangement of each printing hammer in the conventional printing/rad Figure 5 is a partial perspective view showing the structural concept of the print head of the present invention, and Figure 6 is a part of the equivalent circuit of a conventional print head. FIG. 7 shows a part of the equivalent circuit of the print head of the present invention. FIG. 8 is a partial perspective view of the print head showing another embodiment of the present invention. FIG. 9 is a partial perspective view of the print head of the present invention. FIG. 7 is a partial perspective view of a print head showing another embodiment of the present invention. Each symbol in the figure indicates the following, 1...
Leaf spring, 2... Base, 3... Fixed plate, 4... Yoke, 5... Permanent magnet, 6... Coil, 7... Hammer pin, 8... Platen, 9... ·ink ribbon,
DESCRIPTION OF SYMBOLS 10... Printing paper, 11... Attraction force characteristics of printing hammer, 12... Restoring force characteristics of leaf spring, 13... Magnetic circuit of the present invention, 14... Contact with the magnetic circuit of the present invention Drive printing hammer, 15...side yoke. Other symbols indicate the following. In Figure 2, X...
・Gap between the leaf spring and the tip of the yoke, Xo... A leaf spring for fortune-telling where the deflection of the leaf spring becomes zero, the gap between the yokes, F... Indicates force, Fm... The leaf spring is attracted to the yoke The maximum value of the suction force when the plate is attracted to the yoke, Fo... The restoring force when the plate is attracted to the yoke. In FIGS. 3 and 4, n: arrangement number of parallel printing hammers constituting the line printer, Fm: suction force, ■: current applied to the coil to cancel the suction force. In FIGS. 6 and 7, φ7. ...Magnetic flux emitted by the permanent magnet, φ, ...Magnetic flux flowing in the attractive part of the leaf spring, φg
s...Magnetic flux flowing to the attraction part of the leaf spring in the printing hammers at both ends of a conventional print head, pt...Permeance from the permanent magnet to the attraction part of the leaf spring, Pg...
Permeance of the adsorption part of the leaf spring, PS: Permeance of the sides of the printing hammers at both ends of a conventional print head, Po: Total permeance of the magnetic circuit of the present invention.゛'''''' 4 S-1--9-9'h-L
H-l 9t.