Patent ID: 7088940

Claim:
An image forming device comprising: an electrostatic latent image carrier on which an electrostatic latent image is formed; a main frame which supports the electrostatic latent image carrier; a developing unit which includes a developer carrier that supplies a developer to the electrostatic latent image carrier and a replenish chamber that replenishes the developer to the developer carrier, and which is inserted removably in the main frame; a pressing body which is provided on the main frame and is slidable int a direction along a straight line orthogonal to a rotational center shaft of the electrostatic latent image carrier and a rotational center shaft of the developer carrier; means for operating the pressing body to press a bottom surface of the developing unit by sliding the pressing body in a direction of the straight line and to hold the pressing body so that the developer carrier is maintained under a state making contact with the electrostatic latent image carrier; means for detecting which is provided on the main frame and detects a remaining amount of the developer in the replenish chamber; means for operating to press or not press the developing unit by sliding the pressing body provided on the main frame; and means for transferring the means for detecting between a receded position and an operational position in response to a movement of the means for operating to press or not press the developing unit, wherein at the receded position, the means for detecting is receded from a range where the developing unit passes through when the developing unit is inserted or removed, and at the operational position, the means for detecting detects the remaining amount of the developer.