Printer hammer assembly

Details Printer hammer assembly Printer hammer assembly

1978-03-01

1980-04-29

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

101 9348, B41J 134

Patent

active

042000432

ABSTRACT:
In the printer, each printing hammer is composed of a pair of electroconductive elastic members arranged parallel to the axis of a type drum and is provided with paramagnetic material at its head. The hammer, when not used, is kept pulled in the non-printing position with the paramagnetic material attracted by a permanent magnet to accumulate mechanical energy in the elastic members. When the accumulated energy is discharged by an electromagnet provided at each hammer head including the paramagnetic material, printing operation is executed. Finishing the printing operation, the hammers return quickly to their home positions by the permanent magnet attraction force. A type drum and hammer heads are composed of an organic resilient substance.

REFERENCES:
patent: 3121131 (1964-02-01), Blume
patent: 3172352 (1965-03-01), Helms
patent: 3266418 (1966-08-01), Russo
patent: 3643595 (1972-02-01), Helms et al.
patent: 3707122 (1972-12-01), Cargill
patent: 3734012 (1973-05-01), Huggins
patent: 3735698 (1973-05-01), Lenders et al.
patent: 3780650 (1973-12-01), Meier
patent: 3793949 (1974-02-01), Rohwedder
patent: 3805698 (1974-04-01), Bowers et al.
patent: 3845850 (1974-11-01), Herr et al.
IBM Tech. Disc. Bulletin, V. D. McCarty, vol. 15, No. 3, Aug. 1972, pp. 824-825.
IBM Tech. Disc. Bulletin, R. W. Luoma, vol. 17, No. 1, Jun. 1974, pp. 340-341.

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