Patent ID: 7974552
Filing Date: 2011-07-05
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image carrier that moves at a predetermined speed while carrying an image; a transfer roller that includes a roller base material, a concave portion that is provided on a peripheral surface of the roller base material, a grip unit that is disposed on the concave portion and grips a recording medium, a sensor connected to an end of a rotation shaft of the transfer roller being configured to detect a rotation phase of the transfer roller, and an elastic layer that is disposed on a peripheral surface of the roller base material, the transfer roller that grips recording medium by the grip unit when the concave portion faces the image carrier and passes the recording medium through a nip that is formed between the image carrier and the elastic layer when making contact with each other so that the image carried on the image carrier is transferred on the recording medium; a roller driving unit that rotates the roller base material; and a control unit that controls the roller driving unit so as to adjust a timing for forming the nip.