Patent ID: 8705992

Claim:
A printer module comprising: a writing system that generates an electrostatic image on a first surface; a development system that causes a toner to develop against the electrostatic image to form a print image; a transfer system having a transfer surface on which the first surface transfers the print image and that causes the print image to transfer from the transfer surface to a receiver when the transfer surface is moved through a printing area; a proximity sensor that senses a condition from which it can be determined that a receiver is at a position from which a cross edge of the receiver can reach the printing area within a determined period of time; a local controller that causes the writer to cause the print image to be generated so that the print image is moved along a printing path through the printing area so that despite any possible variations in a location of the print image or the cross edge of the receiver, toner is being transferred as the cross edge of the receiver is moved through the printing area by a receiver transport system of a printer and so that the print image is transferred to either the receiver or a sheet which is introduced into the printing path; and a verification sensor that senses whether a receiver is positioned on the sheet and that generates the print image so that the print image is moved through the printing area; wherein the verification sensor can separately sense a cross edge of the sheet and a cross edge of a receiver on the sheet and can determine the positioning of the print image based upon a time at which the cross edge of the receiver is at the verification sensor and a time at which the cross edge of the receiver on the sheet reaches the verification sensor.