ROTARY CUTTER UNIT AND PRINTER DEVICE HAVING THE UNIT

摘要

A simple and compact rotary cutter unit capable of detecting a home position of a rotary cutter, and a printer device having the rotary cutter unit. A radially outwardly extending fin-shaped detected member is arranged on an end portion of the rotating blade opposed to a second gear of the rotating blade. A photosensor is arranged within a main frame of the printer device so that the photosensor may detect the fin-shaped member when the rotating blade is positioned at the home position. The fin-shaped member and the photosensor are not positioned outside relative to both ends of the rotating blade in relation to the direction of the rotational axis of the rotating blade. Therefore, it is not necessary to increase the width of the printer device due to the presence of the fin-shaped member or the photosensor, whereby the printer device may be compactly constituted.

主权项

1. A rotary cutter unit for cutting printing paper and containable in a printer device, the rotary cutter unit comprising:
a frame; a rotating body rotatably supported by the frame about a center axis, and including a movable blade extending axially as an axial blade, the rotating body having end portions and a detected part formed thereon, the rotating body being positioned inside of the frame; a detecting part for detecting the detected part; a motor for rotating the rotating body; a first transmission portion provided on one end of the center axis of the rotating body for transmitting rotating force of the motor to the rotating body, the first transmission portion being positioned outside of the frame where the rotating body is supported, wherein both the detected part formed on the rotating body and the detecting part are accommodated inside of the frame supporting the rotating body, and wherein the detecting part is a mechanical switch having a movable portion configured to be displaced when the movable portion contacts the detected part.