초록 ▼

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

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.

대표청구항 ▼

A sheet feeding device and a printing apparatus housed in a frame body, the sheet feeding device for feeding along a feeding direction a sheet on which a print is executed at a printing position, comprising: at least one upstream feeding roller installed on the upstream side of the printing position

A sheet feeding device and a printing apparatus housed in a frame body, the sheet feeding device for feeding along a feeding direction a sheet on which a print is executed at a printing position, comprising: at least one upstream feeding roller installed on the upstream side of the printing position along a feeding direction; at least one upstream pinch roller for nipping a sheet with an opposed upstream feeding roller; an upstream energization means for making the at least one upstream pinch roller and the opposed feeding roller be pressed against each other by an upstream pressure; at least one downstream feeding roller of the same size as the at lest one upstream feeding roller; at least one downstream pinch roller of the same size as the at least one upstream pinch roller for nipping a sheet with an opposed downstream feeding roller; and a downstream energization means for making the at least one downstream pinch roller and the opposed downstream feeding roller be pressed against each other by a downstream pressure, wherein said at least one downstream feeding roller and said at least one upstream feeding roller are rigid members, said at least one downstream pinch roller and said at least one upstream pinch roller are elastic members, and a downstream pressure is higher than an upstream pressure as applied between opposed downstream and upstream feed and pinch rollers respectively.