Printer and method of adjusting conveying distance of recording sheet

Abstract

A printer includes a platen roller, a first sheet feed roller, a second sheet feed roller, a first branch transmission gear group, a second branch transmission gear group, and thrust amount adjusting means. The first sheet feed roller is provided on the upstream side of the platen roller in the conveying direction of the recording sheet. The second sheet feed roller is provided on the downstream side of the platen roller in the conveying direction of the recording sheet. The first branch transmission gear group is provided on a power transmission path between the platen gear and the first sheet feed gear. The second branch transmission gear group is provided on a power transmission path between the platen gear and the second sheet feed gear. The thrust amount adjusting means adjust movable distances that are caused by the thrust of the first and second idler gears. A tooth trace of one of the gears of each of the first and second branch transmission gear groups has an inclination angle with respect to an axial direction, and the first and second branch transmission gear groups are formed of first and second idler gears including inclined gear portions of which inclined directions of tooth traces are the same as each other.

Description

technical field [0001] The invention relates to a printer and a method for adjusting the conveying amount of recording paper. The recording paper is reciprocally conveyed and ink colors are superimposed for color printing by means of paper feeding mechanisms arranged on the upstream and downstream sides of the recording paper conveying direction. Background technique [0002] In conventional printers, color printing is performed by superimposing ink colors by thermal transfer while feeding recording paper back and forth (see Patent Document 1). Generally, this type of printer includes a first paper feeding mechanism arranged upstream in the recording paper feeding direction and a second paper feeding mechanism arranged downstream. The above-mentioned first and second paper feed mechanisms are respectively composed of a first paper feed roller and a second paper feed roller that can be driven in rotation, and a first paper feed roller that is pressed against the first paper f...

AI Technical Summary

Problems solved by technology

When performing the above-mentioned adjustment, it is necessary to prepare a plurality of blocks with a pair of mounting holes separated by a specified distance in advance, and there is a problem that the adjustment operation is difficult.

Moreover, the distance between the shafts of each gear support shaft is determined by the formation positions of the above-mentioned pair of mounting holes, so it cannot be strictly adjusted.

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