Abstract: An image output apparatus prints an image of an original document and compares the printed image with the original document. Information representative of the original document operates a printing unit for printing an image of the original on a sheet of paper supplied from a paper feeding device. An image sensor senses the image on the printed paper and provides information representative thereof. The information from the image sensor is compared with the information supplied from the original document.

Abstract: An electrostatic recording apparatus for recording, developing and fixing an image on a sheet of recording paper includes an electrostatic recording head and a roller for forming an electrostatic image on the sheet of recording paper while the latter travels between the electrostatic recording head and the roller. The electrostatic recording head and the roller are relatively movable toward each other for pressing the sheet of recording paper against the electrostatic recording head during a period of time in which the sheet of recording paper travels between the electrostatic recording head and the roller to allow the electrostatic recording head to form the electrostatic image on the sheet of recording paper. The electrostatic recording head and the roller are relatively displaceable away from each other during a period of time other than the above period of time.

Abstract: An electrostatic recording apparatus for recording, developing and fixing an image on a sheet of recording paper, comprises an electrostatic recording head and a roller. Transport structure is located at the down stream side of the electrostatic recording head with respect to a direction of feed of the sheet of recording paper. A control rotates the roller when a leading edge of the sheet of recording paper is sandwiched between the electrostatic recording head and the roller and stops rotation of the roller during a period of time after the leading edge of the sheet of recording paper which has passed through the electrostatic recording head and the roller has started being transported by the transport structure and before the trailing edge has passed between the electrostatic recording head and the roller, the roller being rotatable in response to feeding of the sheet after the roller has ceased to be driven.