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Paper-feeding-device-in-a-printer

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Paper feeding device in a printer

Details

Inventors: Sugiura, Toshiaki;
Assignee: Brother Kogyo Kabushiki Kaisha (Nagoya, JP)
Primary Examiner: Burr; Edgar S.
Assistant Examiner: Yan; Ren
Attorney, Agent or Firm: Oliff & Berridge

A feeding device for a printer having a combination of at least one feeding roller with an opposing pinch roller both upstream and downstream, in the feed direction, of a print position. The upstream and downstream side paper feeding rollers are made from metal and the upstream and downstream pinch rollers are made of a elastic material. The upstream and downstream side paper feeding rollers feed a paper sandwiched between the feeding rollers and opposing pinch rollers. The nip pressure on the downstream side is slightly stronger than the nip pressure on the upstream side so that the feed rate is slightly higher at the downstream side than at the upstream side. As a result, the paper is tant as it moves past the print position. Further, the paper is accurately positioned for each line, even after the paper has cleared than nip of the upstream side paper feeding and pinch rollers.

DETAILED DESCRIPTION An object of the invention is to provide a precise paper feeding device using paper feeding rollers of the same shape comprised of a hard member, like metal, capable of obtaining a precise and stable paper feeding accuracy by a simple structure.
To achieve the object in a paper feeding device of a printer having paper feeding means on the upstream and the downstream sides of the paper feeding direction with a printing portion therebetween, the paper feeding means installed on the upstream side and the downstream side of the paper feeding direction comprises a paper feeding roller made from a hard member and a pinch roller made from an elastic member.
The pinch roller pressure contacts the paper feeding roller and is rotatable.
A loading means gives a predetermined pressure to the pinch roller.
The pressure of the pinch roller applied to the paper feeding roller on the downstream side, by said loading means, is set stronger than the pressure of the pinch roller applied to the paper feeding roller on the upstream side, by said loading means.
With an above-mentioned structure, the invention rotates a pair of the paper feeding rollers to feed a paper by sandwiching the paper between a pair of paper feeding rollers made from a hard member and a pair of elastic pinch rollers.
The paper feeding rollers are installed on the upstream and downstream sides of the paper feeding direction and rotatable pinch rollers contact the paper feeding rollers with a predetermined pressure.
As stated previously, the pressure of the pinch rollers applied to the paper feeding rollers on the downstream side is set stronger than the pressure of the pinch rollers applied to the paper feeding rollers on the upstream side.
Therefore, the paper feeding amount on the downstream side in a little bit greater than that of the upstream side and the feed paper is stretched.
It is clear from the above explanation, that the paper feeding amount at the downstream side is a little bit larger than that at the upstream side by making the pressure of the pinch rollers applied to the paper feeding rollers on the downstream side stronger than that of the pinch rollers applied to the paper feeding rollers on the upstream side

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