Platen retaining structure and recording unit

Details Platen retaining structure and recording unit Platen retaining structure and recording unit

2011-07-26

2011-07-26

Nguyen, Anthony H. (Department: 2854)

Typewriting machines

Platen or platen-moving mechanism

For movement of platen other than for line-spacing

C400S653000

Reexamination Certificate

active

07985032

ABSTRACT:
A platen retaining structure has a head, a platen supporting the sheet material during a processing operation of the sheet material by the head, a first urging member urging the head against the platen, and a frame supporting the head and the platen and formed with a notch and a pawl. The notch has a retaining portion that retains a shaft portion and an opening portion opening to an exterior of the frame. The pawl regulates movement of the shaft portion from the retaining portion to the opening portion of the notch. A release arm engages with the shaft portion and is mounted to undergo movement with respect to the frame. A second urging member urges the release arm and moves the release arm along with movement of the head away from the platen against an urging force of the first urging member, and causes the platen to apply a pressing force in a direction in which the shaft portion of the platen escapes from the notch via the opening portion. An urging direction of the second urging member is set as a direction in which the second urging member applies a pressing force to the shaft portion of the platen through the release arm when an urging force applied by the platen through the head from the first urging means is released to thereby move the shaft portion of the platen from the notch.

REFERENCES:
patent: 4913567 (1990-04-01), Imamaki et al.
patent: 5181787 (1993-01-01), Hosomi
patent: 6249302 (2001-06-01), Sekiya
patent: 6765602 (2004-07-01), Mori
patent: 6899479 (2005-05-01), Hayashi et al.
patent: 7547153 (2009-06-01), Yoshioka
patent: 2003/0058327 (2003-03-01), Louis
patent: 2005/0281606 (2005-12-01), Koyama et al.
patent: 1262326 (2002-12-01), None
patent: 1516737 (2005-03-01), None

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