Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – Carriage-feed mechanism
Patent
1979-11-20
1982-11-16
Wright, Jr., Ernest T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
Carriage-feed mechanism
400341, 400686, 101 9304, 310 12, 318135, B41J 1900
Patent
active
043592899
ABSTRACT:
An arrangement for bidirectionally driving a hammer bank shuttle assembly along a linear path in a line printer includes an opposite pair of circular, rotatable elements having an elongated shuttle assembly mounting element and an elongated counterbalancing element extending between the pair of rotatable elements on the opposite sides thereof. Pole pieces and a magnet disposed between and adjacent the shuttle assembly mounting element and the counterbalancing element provide magnetic flux which flows through portions of the opposite elements to attract and maintain the elements in contact with the opposite rotatable elements. A pair of serially coupled coils mounted on the counterbalancing element and disposed within the air gaps formed by the pole pieces and the magnet are energized by a cyclically varying signal to bidirectionally drive the shuttle assembly mounting element and its included hammer bank shuttle assembly along the linear path as the counterbalancing element is caused to reciprocate between opposite limits of movement defined by an opposite pair of resilient elements in the path of movement of the counterbalancing element. In an alternative embodiment the coils are disposed between the counterbalancing element and the shuttle assembly mounting element so as to form air gaps with and magnetically interact with a first pair of magnets mounted in spaced-apart relation along the length of the counterbalancing element and a second pair of magnets mounted in spaced-apart relation along the length of the shuttle assembly mounting element.
REFERENCES:
patent: 2337430 (1943-12-01), Trombetta
patent: 3109113 (1963-10-01), Henry-Baudot
patent: 3618514 (1971-11-01), Nyman et al.
patent: 3941051 (1976-03-01), Barrus et al.
patent: 4149808 (1979-04-01), Matthias et al.
patent: 4151447 (1979-04-01), von der Heide et al.
patent: 4180766 (1979-12-01), Matula
patent: 4187453 (1980-02-01), Rough
patent: 4239403 (1980-12-01), Matula et al.
Barrus Gordon B.
Matula Jerry
Printronix, Inc.
Wright, Jr. Ernest T.
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