Patent ID: 9063467
Filing Date: 2015-06-23
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image bearing member; a developer bearing body which is rotatably supported and bears and conveys developer to a developing position facing the image bearing member to develop a latent image formed on the image bearing member; a first chamber which supplies the developer to the developer bearing body; a second chamber which connects with the first chamber at opposite end portions to form a circulating path for the developer, with the second chamber facing the developer bearing body at its peripheral side at a position further upstream than the first chamber in a rotational direction of the developer bearing body and collecting developer which is charged on the developer bearing body before the developer is conveyed to a position facing the first chamber in a peripheral direction; a first conveying member which conveys the developer in the first chamber; a second conveying member which conveys the developer in the second chamber; and a controlling portion which performs a first mode to drive the developer bearing body at a first speed and performs a second mode to drive the developer bearing member at a second speed lower than the first speed, wherein in a case of performing the second mode after performing the first mode, the controlling portion starts to drive the first conveying member at a first predetermined speed and then shifts to a second predetermined speed lower than the first predetermined speed after changing a driving speed of the developer bearing member from the first mode to the second mode.