JP2006078797A5 - - Google Patents

Claims (3)

Conveying means for conveying the recording material, transfer means for transferring a toner image to the conveyed recording material, heating means for heating the recording material carrying an unfixed toner image, and sandwiching the recording material together with the heating means An image forming apparatus having a pressurizing unit for conveying, and arranged such that a center in a longitudinal direction of the heating unit is a conveyance center of the recording material .
A central portion temperature detection means for detecting the temperature of the substantially longitudinal center portion of the front Symbol heating means,
An end temperature detecting means for detecting an end temperature of the heating means;
The recording material conveyance path to the transfer unit is disposed on the opposite side of the recording material conveyance center position from the side where the end temperature detection unit is disposed, and is conveyed to the transfer unit. Recording material detection means for detecting the presence or absence of the recording material;
The power supplied to the heating means is controlled so that the temperature detected by the center temperature detecting means is maintained at a predetermined fixing temperature, and the heating means is not turned on based on the temperature detected by the end temperature detecting means. Control means for controlling the power supplied to the heating means or the conveyance time interval of the recording material so that the paper region is not overheated,
When the recording material detection unit detects that the recording material is absent, the control unit supplies power to the heating unit or transports the recording material so that a non-sheet passing area of the heating unit does not become overheated. An image forming apparatus that controls a time interval or stops an image forming operation on the assumption that a conveyance center of the recording material is not a longitudinal center of the heating unit . The image forming apparatus according to claim 1, wherein the recording material detecting means image forming apparatus characterized by disposing one or more in the range up to the recording material ends from the conveying center position. 2. The image forming apparatus according to claim 1, wherein a plurality of the recording material detection means are arranged in a range from a conveyance center position to a recording material edge, at least one of which is located at the end temperature detection means and the conveyance center position. an image forming apparatus characterized in that placed symmetrically against.