Image forming apparatus which prevents a sheet jam caused by a sheet attached to an image bearing member

摘要

An image forming apparatus comprising: an image bearing member which bears a toner image; a first driving portion which drives the image bearing member; a transfer portion which nips a sheet with the image bearing member and transfers the toner image to the sheet from the image bearing member; a sheet conveying portion which conveys the sheet with the toner image transferred by the transfer portion; a second driving portion which drives the sheet conveying portion; a sheet detector which detects the sheet between the transfer portion and the sheet conveying portion; and a controller which controls the second driving portion to drive the sheet conveying portion to convey the sheet after the first driving portion is stopped, so that the sheet detector can detect the sheet nipped between the image bearing member and the transfer portion.

主权项

1. An image forming apparatus comprising:
an image bearing member which bears a toner image; a DC motor which drives the image bearing member; a transfer portion which nips a sheet with the image bearing member and transfers the toner image to the sheet from the image bearing member; a fixing unit which fixes the toner image to the sheet; a sheet conveying unit which conveys the sheet with the toner image transferred by the transfer portion from the transfer portion to the fixing unit; a stepping motor which drives the sheet conveying unit corresponding to the input pulses; a sheet detector which detects the sheet between the transfer portion and the sheet conveying unit; and a controller which controls the DC motor and the stepping motor, wherein the controller simultaneously commences stopping processes of the DC motor and the stepping motor, and controls a deceleration rate of the stepping motor by controlling input pulses in a manner that the sheet conveying unit completely stops after the image bearing member completely stops, so that the sheet detector can detect the sheet nipped between the image bearing member and the transfer portion.