Patent ID: 8746687

Claim:
An image forming apparatus, comprising: a sheet feed unit configured to feed a sheet toward a first feed path in a forward feed direction; a sheet tray configured to accommodate the sheet, the sheet tray being configured to be located at a feedable position at which the sheet feed unit is capable of feeding the sheet accommodated in the sheet tray and a non-feedable position which is different from the feedable position; a recording unit configured to record an image on the sheet which is fed from the sheet tray and guided by the first feed path; a roller provided on a downstream side, in the forward feed direction, with respect to the recording unit, the roller being configured to rotate in a first rotation direction to feed the sheet forwardly and a second rotation direction to feed the sheet reversely; a guide member including a first guide part defining a part of a lower surface of a second feed path which is connected to the first feed path at a first predetermined position which is located on a downstream side, in the forward feed direction, with respect to the recording unit and on an upstream side with respect to the roller, and at a second predetermined position which is located on an upstream side, in the forward feed direction, with respect to the recording unit, the guide member being configured to switch an orientation between a first orientation at which the first guide part define a part of the lower surface of the second feed path and a second orientation at which the first guide part is located at a lower position than a position at the first orientation; an interlocking mechanism which causes the guide member to have the first orientation in association with movement of the sheet tray to the feedable position, the interlocking mechanism causing the guide member to have the second orientation in association with movement of the sheet tray to the non-feedable position; a rockable member located at the first predetermined position, the rockable member being configured to rotate about an axis defined at a first end portion among: a first position at which a second end portion at a downstream side in the forward feed direction with respect to the first end portion is supported by the guide member having the first orientation; a second position at which the second end portion is located at a higher position that the second end portion when located at the first position; and a third position at which the second end portion is located at a lower position that the second end portion when located at the first position; and a signal generating unit configured to output a signal corresponding to the position of the rockable member.