Medium feeder and printer including the same

摘要

A medium feeder includes a first rotation body; a second rotation body which engages with the first rotation body while overlapping with the first rotation body, and disengages from the first rotation body in response to the presence of the feed target medium nipped between the first and second rotation bodies; a rotation body support member which supports the second rotation body, and is configured to be movable between an advancing position where the second rotation body engages with the first rotation body and a retreating position where the second rotation body disengages from the first rotation body; and a detection unit which detects migration of the rotation body support member to the retreating position.

主权项

1. A medium feeder, comprising:
a feed roller which has a first roller and a second roller, and rotates to deliver a feed target medium while nipping the feed target medium; a first rotation body attached to a first roller shaft of the first roller; a second rotation body which engages with the first rotation body while overlapping with the first rotation body, and disengages from the first rotation body in response to the presence of the feed target medium nipped between the first and second rotation bodies; a rotation body support member which supports the second rotation body rotatably around a second roller shaft of the second roller, and is configured to be movable relative to the second roller, and movable between an advancing position where the second rotation body engages with the first rotation body and a retreating position where the second rotation body disengages from the first rotation body; a detection unit which detects migration of the rotation body support member to the retreating position; and a rotation member that includes a shaft, an engaging portion which engages with the rotation body support member and reciprocatively rotates around the shaft in accordance with the movement of the rotation body support member between the advancing position and the retreating position, and a detection target portion which reciprocatively rotates around the shaft in accordance with the movement of the rotation body support member between the advancing position and the retreating position, wherein
the detection target portion is disposed outside the engaging portion in the radial direction of the shaft, andthe detection unit faces to one of the rotation ends of the detection target portion.