Drive unit

摘要

A drive unit includes an output shaft, a drive source, which causes the output shaft to rotate in a reciprocating manner within a first angular range, an arcuate movement portion, which performs arcuate movement about the axis of the output shaft as the shaft is rotated, a pivot shaft, and a lever member, which is rotational about the axis of the pivot shaft. As the arcuate movement portion performs arcuate movement, the lever member is rotated, in a reciprocating manner within a second angular range, while changing the engaging position with the arcuate movement portion.

主权项

1. A drive unit comprising:
an output shaft; a drive source, which causes the output shaft to rotate in a reciprocating manner within a first angular range larger than 180° and less than 360°; an arcuate movement portion, which is located at a position offset from the axis of the output shaft and is integrally rotational with the output shaft, wherein the arcuate movement portion performs arcuate movement about the axis of the output shaft as the output shaft is rotated; a pivot shaft, which is located at a position offset from the axis of the output shaft; and a lever member, which is rotational about the axis of the pivot shaft and is engaged with the arcuate movement portion, wherein, as the arcuate movement portion performs arcuate movement, the lever member is urged by the arcuate movement portion while an engaging position between the arcuate movement portion and the lever member varies, and wherein the lever member is rotated in a reciprocating manner within a second angular range, which is smaller than the first angular range, to cause a driven member to integrally rotate in a reciprocating manner, wherein the drive source includes a motor main body and a worm gear, and the output shaft is a worm wheel of the worm gear.