Automatic paper roller release mechanism for teletype and electr

Details Automatic paper roller release mechanism for teletype and electr Automatic paper roller release mechanism for teletype and electr

1982-05-17

1984-01-17

Burr, Edgar S.

Typewriting machines

Sheet or web

Including friction-feed means

400637, B41J 13036

Patent

active

044261705

ABSTRACT:
A lever for moving a shaft which, in turn, moves pressure rollers away from the platen, against which the paper is held by the pressure rollers, is movable between first and second positions. The lever is urged, as by a spring, toward the first position which corresponds to the paper engaging position of the rollers. When moved to the second position, the lever is engaged by releasable holding means which is resiliently urged toward the lever but is retracted by electromagnetic means. The latter is energized by current supplied through two switches in series, one of which is closed when the lever is moved to the second position, and the other of which is closed when the carriage of the teletypewriter or the typewriter is returned. The switch closed by the lever, when open, with the lever in the first position, prevents the electromagnetic means from being energized each time the carriage returns, after the lever has been released through the electromagnetic means and is moved by the spring back to the first position.

REFERENCES:
patent: 980689 (1911-01-01), Smith
patent: 1106929 (1914-08-01), Dennis
patent: 2332033 (1943-10-01), Welker
patent: 2862596 (1958-12-01), Metzner
patent: 2885053 (1959-05-01), Davidson
patent: 3421612 (1969-01-01), Pitt
patent: 3677452 (1972-07-01), Wallace
patent: 4173420 (1979-11-01), Okabe

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