Document Type and Number:
Japanese Patent JPS5073721
Kind Code:
A
Abstract:
Paper feed mechanism for printer for electronic calculator comprises simplified paper roll support having readily removable shaft with longitudinally spaced peripheral grooves and sleeve slidable and rotatable on shaft to engage flexible inturned flange at one of its ends with a selected groove and outwardly extending flange at other end of sleeve thereby engageable with edge of paper roll to guide and impose drag against unwinding of different width rolls, and paper feed including spring-backed pressure roller, hollow cylindrical platen with end caps press-fitted therein having central hubs press-fitted on platen shaft, one with internal ratchet gear, and external platen gear rotatable on platen shaft as part of platen drive train including spring-loaded drive coupling cooperating with internal ratchet gear, intermediate gear and cyclically rotatable worm gear which, together with a detent, prevent backlash and effect minimum acceleration without overspin, all providing a rigidly located printing surface with manual twirling of platen available to feed paper by virtue of drive coupling acting as break-away clutch.
Application Number:
JP10184274A
Publication Date:
June 18, 1975
Filing Date:
September 04, 1974
Export Citation:
International Classes:
B41J11/38; B41J11/04; B41J15/04; B41J15/16; (IPC1-7): B41J11/02; B41J15/04
Domestic Patent References:
| JP42025252A | ||||
| JPS3630407Y1 | ||||
| JPS4712804B1 |