| 摘要 |
<p>In a mechanism for friction feeding web, such as paper, in a typing machine having pairs of pressure rollers being journal supporting and engageable and disengageable with a cylindrical platen of the typing machine to achieve a less complex design and to reduce manufacturing costs, the invention provides that each of the pairs of rollers are part of a truck assembly unit (30, 32) having two identical parts (34, 36) which lock together capturing two pressure rollers (38, 40). The truck assembly unit (30, 32) is supported on a cylindrical portion of a support bar (12) so that it can rotate through a limited range, the range being limited by a ridge running along the bar. The support (20) is affixed eccentrically on journals (18, 20) captured in the frame (22, 24) of a typing a machine so that rotation of the bar moves the supported truck assembly towards and away from the platen (80). Arms supporting the rollers (46, 48) provide flexure to bias the rollers (38, 40) against the platen (80). </p> |
