Print hammer assembly method

Details Print hammer assembly method Print hammer assembly method

1978-12-11

1981-05-26

Hall, Carl E.

Printing

Selective or progressive

Bed and platen machines

29602R, 101 9348, B41J 902, H01F 4102

Patent

active

042691184

ABSTRACT:
This print hammer assembly method utilizes an elongated thin metal strip punched to form repetitive flag panels each having a flag region non-symmetrically linked to a surrounding frame, and a connector arm extending obliquely between the frame and flag. All assembly steps are performed while maintaining the panels connected in the strip. A flat coil, centered by a boss on the flag region, is sandwiched between and adhesively bonded to the strip and a second flag panel severed from another like strip. Spring wires are attached to the connector arms of both panels before sandwiching, and the coil leads are subsequently attached to the connector arms. Simultaneous soldering of the coil leads and spring wires to the connector arms is carried out from one side of the assembly strip, advantageously using solder paste and focused infrared heating. After discarding the excess frame portions, the hammers are embedded in a molding compound while still linked together in a strip. After molding, the links are severed to separate the individual hammers.

REFERENCES:
patent: 3643595 (1972-02-01), Helms et al.
patent: 3913195 (1975-10-01), Beaver
patent: 3983806 (1976-10-01), Ishi
patent: 4044455 (1977-08-01), Watanabe et al.

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