Typewriting machines – Sheet or web – Including friction-feed means
Patent
1995-12-19
1999-03-30
Yan, Ren
Typewriting machines
Sheet or web
Including friction-feed means
400637, B41J 1302
Patent
active
058880003
ABSTRACT:
In the present invention, the pressure between the paper feed roller and the trailing roller can be changed while preventing possibility of human misoperation and without requiring exclusive motors. The paper support pressure between a paper feed roller and a trailing roller for clamping and conveying paper is changed by a friction switching mechanism. The drive force of a paper feed motor 60 for driving the paper feed roller is transmitted to said friction switching mechanism via a clutch mechanism C1. Whether the clutch mechanism C1 is connected or disconnected depends on the direction of the drive force of a ribbon feed motor 38 which drives the ink ribbon. When the ribbon driving motor 38 drives in reverse (anti-clockwise direction), an interlinked fan-shaped gear 94 rotates clockwise, a connecting bar 95 is displaced causing a cam 97b to also be displaced resulting in a pinion 63b and gear 72 to be engaged and interfitted with the clutch mechanism C1. Consequently, the rotation of the paper feed motor 60 is transmitted to the gear 72. By means of the rotation of the gear 72, the slide lever of the friction switching mechanism is slid, the rocking lever for supporting the trailing roller is rocked, and the paper supporting pressure between the rollers is changed.
REFERENCES:
patent: 5020929 (1991-06-01), Funamoto et al.
patent: 5030024 (1991-07-01), Seshimo
patent: 5486061 (1996-01-01), Kakuguchi
patent: 5681124 (1997-10-01), Yasuoka
patent: 5746525 (1998-05-01), Sanda et al.
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