Patent ID: 8926202
Filing Date: 2015-01-06
Classification: B41J,B65H

Abstract:
1. An image forming apparatus comprising: a roll body in which a print medium is rolled in a roll, a conveyance unit configured to convey the print medium, a load applying unit configured to apply a load to the roll body in a direction opposite to a medium conveyance direction, the load applying unit including a motor and a rotation transmission mechanism placed between the motor and the roll body, a unit configured to cause the motor to be in a state where the motor creates counter-electromotive force when rotational force from the roll body is received, by causing the motor to be in an electrically shorted state or by applying a voltage less than a minimum driving voltage to the motor, a detecting unit configured to detect print medium information of the roll body, and a conveyance speed changing unit configured to change a conveyance speed with which the conveyance unit conveys the print medium, wherein, while a portion of the print medium that is pulled out from the roll body is set in a state where image forming thereon can be started, the motor is caused to be in the state where the motor creates the counter-electromotive force, and the conveyance unit conveys the print medium while controlling the conveyance speed of the print medium in accordance with the print medium information detected by the detecting unit, and wherein the rotation transmission mechanism of the load applying unit includes a torque limiter, and a setting value of the torque limiter is greater than a drive-load torque of the motor when a voltage less than the minimum driving voltage is applied to the motor.