Platen knob device of typewriter

Details Platen knob device of typewriter Platen knob device of typewriter

1983-11-07

1984-06-26

Burr, Edgar S.

Typewriting machines

For line-spacing by incremental rotation of platen

By irregular increments of platen rotation

4005562, B41J 1996

Patent

active

044563957

ABSTRACT:
This invention is a platen knob device in a typewriter for releasing a platen of the typewriter from a platen pitch feed mechanism and changing the platen over to a continuous feed. This platen knob device includes a platen variable fixed onto a platen shaft and a platen driver operative in association with the platen pitch feed mechanism and slidably provided on the platen shaft. The platen driver is urged by the platen variable through a spring, whereby the platen driver and the platen variable are engaged with each other, in which condition, if the platen knob is rotated, then the platen is changed over to the pitch feed. If the platen knob is urged in a direction opposite to the direction in which the platen knob is urged by the spring, then the platen driver is urged against an end face of a cylindrical portion of the platen knob to move in the axial direction thereof and separated from the platen variable to change the platen over to the continuous feed.

REFERENCES:
patent: 658157 (1900-09-01), Merritt
patent: 720762 (1903-02-01), Walker
patent: 791549 (1905-06-01), Grosbois
patent: 855532 (1907-06-01), Ruger, Jr.
patent: 925422 (1909-06-01), Burns et al.
patent: 1165547 (1915-12-01), Sholes
patent: 1831955 (1931-11-01), Harney
patent: 4247212 (1981-01-01), Wu
IBM Selectric Typewriter Service Manual, May 1975, IBM Corp., pp. 145, 149.

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