Method of controlling driving of conveyor means in automatic document

Abstract

A method of controlling the driving of a conveyor in an automatic document conveying device in which the conveyor is positioned opposite a transparent plate in an image processing machine and a reversibly rotatable electric motor for driving the conveyor. In the automatic document conveying device, a sheet-like document fed between the transparent plate and the conveyor is conveyed in a predetermined direction on the transparent plate by applying a normally rotating voltage to the electric motor to rotate the electric motor in a normal direction and drive the conveyor in a predetermined direction. Thereafter, the document is stopped at a required site on the transparent plate by producing a braking action in the electric motor and thus stopping the conveyor. The conveying speed of the conveyor is detected as the conveyor is driven in the predetermined direction is detected. According to the detected conveying speed, the time at which the braking action is produced in the electric motor, and/or at least one of a time at which the application of the normally rotating voltage to the electric motor is stopped and the time at which the braking action is produced in the electric motor is controlled. The braking action is produced by applying a second voltage to the electric motor after the lapse of some time following the stopping of applying of the normally rotating voltage to the electric motor.