Method of moving print elements in printheads and a printhead wi

Details Method of moving print elements in printheads and a printhead wi Method of moving print elements in printheads and a printhead wi

1988-03-09

1989-10-31

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 101 9303, 4001573, 400166, 400124, B41J 312, B41J 938

Patent

active

048773425

ABSTRACT:
The invention relates to a method in printheads (1) with a plurality of print elements (4) arranged movable in relation to each other and a moving mechanism (7, 9, 11, 12, 14) with magnetic field-responsive forces for moving selectable print elements to print or inactive positions. With utilization of the method the forces with which selected print elements are moved in appropriate cases to their print positions can be changed in coordination for a plurality of print elements. In accordance with the invention this is achieved by a magnetic field change coordinated for several print elements. The invention also relates to a printhead (1) with a plurality of first electromagnet means (9, L1 L24) for moving selectable print elements (4) and also a second electromagnet means (LB) common to a plurality of print elements, for coordinated change of the forces for a plurality of print elements with which the print elements can be moved to their print positions. A method and a printhead in accordance with the invention are primarily intended for matrix printers.

REFERENCES:
patent: 3946851 (1976-03-01), Cestrieres
patent: 4046244 (1977-09-01), Velazquez
patent: 4072224 (1978-02-01), Barnaby
patent: 4396304 (1983-08-01), Davenport
patent: 4472072 (1984-09-01), Harada
patent: 4498791 (1985-02-01), Gilbert
patent: 4584937 (1986-04-01), Bringhurst
IBM Tech. Disc. Bulletin, vol. 28, No. 12, May 1986, pp. 5296-5298, "High Performance, One-Piece Print Actuator".
University Physics, 3rd Edition, by F. W. Sears & M. W. Zemansky, Addison-Wesley, 1964, pp. 741-750.

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