Rotatable cam device for a pickup roller of a printer

Abstract

The present invention relates to a device for switching a pickup roller of an inkjet printer to eliminate an unnecessary load due to maintenance of a contact state between the pickup roller and a knockup plate. The device maintains the contact state between the pickup roller and the knockup plate during a paper feed operation by mounting a rotatable cam device on the paper feeder part. The cam separates the pickup roller from the knockup plate according to the rotational direction of the line feed motor 24 as the driving system of the paper feeder part. After the feed operation has ended, the cam separates the pickup roller from the knockup plate and, as a result, an unnecessary load after the paper feed has ended is eliminated. A uniform quality for the line feed can be gained by feeding the paper without an excessive load at the beginning, and accordingly loss of printing quality (white line, etc.) is prevented.

Dependencies are inferred from the claim text.