Patent ID: 7865126
Filing Date: 2011-01-04
Classification: B41J,G03G

Abstract:
1. An image forming apparatus comprising: a drive roller that nips and conveys a continuous form paper to a downstream side at a predetermined speed; an image forming unit that is provided at the downstream side of the drive roller and transfers a toner image to the continuous form paper; a fixing unit that is provided at the downstream side of the image forming unit and fixes the transferred toner image to the continuous form paper with heat; a paper discharge unit provided at the image forming apparatus, that discharges the continuous form paper on which the fixed toner image fixed by the fixing unit is formed; a sub drive roller that is provided at the downstream side of the fixing unit and at an upstream side of the paper discharge unit which discharges continuous form paper, and nips and conveys the continuous form paper, on which the toner image is fixed, to the downstream side, a rotational speed of the sub drive roller being changable; a buffer unit that is provided between the fixing unit and the sub drive roller provided at the upstream side of the paper discharge unit, the buffer unit increasing or decreasing a buffer amount of the continuous form paper according to expansion or contraction of the continuous form paper caused by heat in the fixing unit; a detection section that detects the buffer amount of the buffer unit; and a control section that controls the rotational speed of the sub drive roller based on the detection result of the detection section such that the buffer amount of the buffer unit is kept substantially constant.