Typewriting machines – Platen or platen-moving mechanism – Cylindrical platen
Patent
1987-10-20
1989-02-07
Pearson, Charles
Typewriting machines
Platen or platen-moving mechanism
Cylindrical platen
400692, B41J 1104
Patent
active
048027952
ABSTRACT:
An apparatus for fixing a platen includes a pair of parallel supporting plates, and a pair of fixing members fitted to end portions of a platen shaft supporting the platen. Each supporting plate has a round supporting hole and a guide hole extending from the supporting hole up to an upper end edge of the supporting plate and having a width smaller than the diameter of the supporting hole. Each fixing member includes a cylindrical body into which the end portion of the platen shaft is rotatably inserted, and an intermediate portion formed on the body and fitted into the supporting hole. An operating arm extends from the body, for rotating the fixing member between a fixed position where the intermediate portion is stably fitted in the supporting hole and a mounting position where the fixing member can be pulled out from the supporting hole through the guide hole. The fixing member is prevented from moving in the axial direction of the platen shaft by a flange formed on the body and a stepped portion formed on the end portion of the platen shaft. When the fixing member is moved to the fixed position, its rotation about the platen shaft is prevented by a projection formed on the operating arm and engaging an engaging hole formed in the supporting plate and a grip portion provided at the operating arm and being contact with the upper end edge of the supporting plate.
REFERENCES:
patent: 1177031 (1916-03-01), Gruner
patent: 1629514 (1927-05-01), Latta
Kabushiki Kaisha Toshiba
Pearson Charles
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