SHEET FEEDING APPARATUS, IMAGE READING APPARATUS, AND IMAGE FORMING APPARATUS

摘要

There are provide a sheet feeding apparatus, in which a feeding roller can take a feeding position and a retracted position through a simple configuration, and an image reading apparatus, and an image forming apparatus including the same. The sheet feeding apparatus includes an original stack tray, a pickup roller, a pickup arm, a separation shaft of a separation roller which is connected to the pickup roller and rotates the pickup arm, a driving motor which is connected to the separation shaft, and a weight member which is supported to the pickup arm on a side opposite to the pickup roller. When the driving motor is driven, the pickup arm is rotated to a feeding position to feed an original. When transmission of a driving to the separation shaft is blocked, the pickup roller is rotated to a retracted position by the weight member.

主权项

1. A sheet feeding apparatus comprising:
a sheet stacking portion in which a sheet is stacked; a feeding roller which feeds the sheet stacked in the sheet stacking portion; a pickup arm which supports the feeding roller such that the feeding roller is movable between a feeding position abutting against the sheet stacked in the sheet stacking portion and a retracted position spaced apart from the feeding position; a driving rotational shaft which is connected to the feeding roller and rotates the pickup arm; a driving portion which drives the driving rotational shaft; and a weight member which is supported to the pickup arm on a side opposite to the feeding roller with respect to the driving rotational shaft, wherein when the driving rotational shaft is driven by the driving portion, the pickup arm is rotated and the feeding roller feeds the sheet at the feeding position, and when a driving from the driving portion to the driving rotational shaft is stopped, the pickup arm is rotated by the weight member and the feeding roller is moved to the retracted position.