Claims
- 1. A printing head for a shuttle type dot line printer including a single reciprocating frame and a plurality of electromagnetic actuating units individually mounted on the frame, said single reciprocating frame being made of a material of high heat conductivity such as aluminum, being provided with rectangular-bottomed recesses formed parallel to a platen for closely accommodating said plurality of electromagnetic actuating units and being provided with heat radiation fins formed parallel to said platen for radiating heat generated by said units, and each of said electromagnetic actuating units comprising:
- a base plate formed of electromagnetically permeable material;
- a shell mounted on one side of the base plate, said shell being of a square cross section capable of fitting into said rectangular recess in the frame and occupying said recess with identical other shells arranged closely side by side, and said shell having an open end;
- a core secured to the shell with an end of said core lying in the same plane as said open end of said shell;
- a coil wound around the core;
- a heat conductive filler provided in said shell between said coil and inner surface of said shell, said heat conductive filler consisting of high heat conductive epoxy resin filler which is provided between said coil and said square cross sectional shell for radiating heat generated in said coil to said shell with high efficiency;
- a single printing spring, one end of which is fixed on the other side of said base plate;
- an armature fixed on the spring and at a position facing the core, said armature being attracted to said core when said coil is energized;
- a wire carried on a free end of the printing spring;
- a single screw extending from a backside of said shell and a single screw extending only through said one end of said printing spring, whereby each of said electromagnetic actuating units is individually, removably mounted to said frame by only both said single screws; and
- a damper means for preventing a rebound of said printing spring affixed to said base plate adjacent to said free end of said printing spring.
- 2. The printing head for a dot line printer according to claim 1 wherein said base plate is slightly bent in a vicinity of an end portion fixing said spring, and the surface of said spring is kept at an inclination angle to the end surface of said core so that the opposing surfaces of said armature and said core make plane contact at the time of their contact.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-187714 |
Sep 1984 |
JPX |
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Parent Case Info
This application is a continuation of Ser. No. 159,501, filed on Feb. 16, 1988 and now abandoned, which is a continuation of Ser. No. 935,145, filed on Nov. 25, 1986 and now abandoned, which is a continuation of Ser. No. 770,393, filed Aug. 28, 1985 and now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (4)
Number |
Date |
Country |
148177 |
Nov 1980 |
JPX |
194576 |
Nov 1983 |
JPX |
136282 |
Aug 1984 |
JPX |
2082508 |
Mar 1982 |
GBX |
Continuations (3)
|
Number |
Date |
Country |
Parent |
159501 |
Feb 1988 |
|
Parent |
935145 |
Nov 1986 |
|
Parent |
770393 |
Aug 1985 |
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