Patent ID: 9703248
Date: 2017-07-11
CPC Classifications: G03G

Claim:
1. A curling detection device, comprising: an endless belt entrained around at least two rollers; a conveyance unit to convey the endless belt by driving the rollers; an image forming unit to form an image by transferring a toner image to either a surface of the endless belt directly or to a recording medium on the endless belt; a pattern image forming controller configured to instruct the image forming unit to form consecutive lines of a curling detection pattern at predetermined intervals in a conveying direction of the endless belt and a predetermined angle against the conveying direction of the endless belt at a predetermined timing; a curling scanning unit to scan the curling detection pattern; and a detecting unit configured to detect a curling of the endless belt if a distance between at least two consecutive curling detection patterns scanned by the curling scanning unit is different from a curling status value, stored in a memory, for more than a predetermined amount.