Patent ID: 6721517
Filing Date: 2004-04-13
Classification: G03G

Abstract:
An image forming apparatus comprising:an image bearing member for bearing an image; a movable recording material carrying member for electrostatically carrying a recording material; transfer means for transferring, at a transfer position, the image from said image bearing member onto the recording material carried on said recording material carrying member; fixing means for fixing the image transferred by said transfer means on the recording material by heat; control means for controlling start timing of application of a transfer output of said transfer means so that the output reaches a level effective to transfer the image before a leading edge of an image formational area of the recording material carried on said recording material carrying member reaches the transfer positions, wherein said transfer means is effective to transfer the image on a second side of the recording material which has already an image fixed by said fixing means on a first side of the recording material, and the transfer output for the second side of the recording material is higher than that for the first side of the recording material, and wherein said control means controls start timing of application of transfer output of said transfer means so that application of the transfer output for transfer operation onto the first side is started after the leading edge of the recording material passes through the transfer position and before the leading edge of the image formational area reaches the transfer position, and so that a time period from the start of application of the transfer output for transfer operation onto the second side to arrival of the leading edge of the image formational area at the transfer position is longer than a time period from the start of application of transfer output for transfer operation onto the first side to arrival of the leading edge of the image formational area of the transfer position.