Sheet transporting apparatus and image forming system

摘要

A sheet transporting apparatus is provided, including a transport mechanism provided with a roller, a motor, a controller, and a measuring input unit, wherein a transport route has a curved area for inverting the sheet, and the controller is constructed such that the control on the motor is executed by a closed loop control system by using a measured value of an control output at an initial stage of the transport of a sheet from a tray, and the control on the motor is switched from the control performed by the closed loop control system to control performed by an open loop control system on condition that a preset phenomenon arises after the sheet is taken out of the tray.

主权项

1. A sheet transporting apparatus comprising:
a transport mechanism including a roller and configured such that a sheet as a transport object is taken out of a tray in accordance with rotation of the roller to transport the sheet to downstream of a transport path continued to the tray; a motor configured to drive and rotate the roller; a controller configured to control the motor so as to control the sheet transport in accordance with the rotation of the roller; and a measuring input unit configured to measure a control output brought about by the control on the motor and to input a measured value of the control output into the controller, wherein the transport path includes a curved area for inverting the sheet; and the controller is configured such that the controller executes the control on the motor by means of a closed loop control system which uses the measured value of the control output at an initial stage of the sheet transport from the tray, and the control on the motor is switched from the control performed by the closed loop control system to control performed by an open loop control system on condition that a particular phenomenon arises after the sheet is taken out of the tray, wherein the controller is configured such that the control on the motor is switched to the control performed by the open loop control system on condition that a phenomenon, in which the sheet arrives at a preset switching position in the transport path, arises as the particular phenomenon; and wherein the controller is configured such that the control on the motor is switched to the control performed by the open loop control system on condition that a phenomenon, in which the sheet arrives at a specified position set on downstream from an upstream side end portion of the curved area as the switching position, arises.