SHEET FEEDING DEVICE, AND IMAGE READING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THIS

摘要

In a sheet feeding device, a feeding roller is driven and rotated to feed a sheet in a conveying direction of a sheet conveying path and a drive transmission mechanism transmits rotation drive force generated in a driving portion to the feeding roller. In this mechanism, a drive input gear having an inner space is arranged on a rotation axis supporting the feeding roller rotatably so as to rotate by the rotation drive force. A drive transmission gear arranged between the feeding roller and drive input gear on the rotation axis rotates and becomes slide-movable along the rotation axis between a first position transmitting the rotation drive force to the feeding roller and a second position cutting off the transmission of the rotation drive force to the feeding roller by the rotation drive force from the drive input gear to transmit the rotation drive force to the feeding roller.

主权项

1. A sheet feeding device, comprising:
a tray portion on which a sheet is placed; a sheet conveying path extending from the tray portion to convey the sheet in a predetermined conveying direction; a feeding roller driving and rotating to feed the sheet in the conveying direction; a driving portion generating rotation drive force used for driving and rotating the feeding roller; and a drive transmission mechanism transmitting the rotation drive force to the feeding roller, wherein the drive transmission mechanism includes: a rotation axis supporting the feeding roller rotatably; a drive input gear formed in a cylinder like shape having an inner space and arranged on the rotation axis so as to rotate around the rotation axis by input of the rotation drive force of the driving portion; and a drive transmission gear arranged between the feeding roller and drive input gear on the rotation axis so as to rotate around the rotation axis and to become capable of slide-moving in an axial direction of the rotation axis between a first position where the rotation drive force is transmitted to the feeding roller and a second position where the transmission of the rotation drive force to the feeding roller is cut off by transmission of the rotation drive force from the drive input gear, and then, to transmit the rotation drive force to the feeding roller, the drive input gear includes a first engaging portion in the inner space, the drive transmission gear includes a second engaging portion connectable to the first engaging portion, the second engaging portion is inserted into the inner space at the second position.