Noise-reducing platen

Details Noise-reducing platen Noise-reducing platen

1982-05-24

1984-06-12

Burr, Edgar S.

Typewriting machines

Platen or platen-moving mechanism

Cylindrical platen

400659, 400689, B41J 11053, B41J 1904

Patent

active

044538480

ABSTRACT:
A noise-reducing platen comprising a circular cylinder, a hub disposed along the longitudinal axis of and within the cylinder, and walls for dividing the annular region between the cylinder and the hub into a plurality of separated longitudinal channels extending the length of the cylinder. The walls include a plurality of vanes disposed at angular intervals about the hub, each vane extending (a) from the hub to the inner surface of the cylinder and (b) along the length of the cylinder, each pair of adjacent vanes defining one of the longitudinal channels. It is believed that the vibrations generated along the longitudinal channels are at a frequency above the audible range, thereby resulting in reduced undesired noise when printing elements strike the platen.

REFERENCES:
patent: 1235753 (1917-08-01), Anderson
patent: 3767023 (1973-10-01), Effinger
patent: 4247213 (1981-01-01), Wurscher
The Elements of Physics; Alpheus Smith; McGraw Hill; 1948; pp. 225-227.
University Physics; F. W. Sears & M. W. Zemansky; Addison-Wesley; 1955; pp. 386-390.

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