| 主权项 |
1. An image forming apparatus comprising:
an image forming unit configured to form an image on a sheet; a sheet supply tray having a bottom plate for supporting the sheet to be supplied to the image forming unit; a first sheet positioning member configured to move relative to the bottom plate in a sheet supply direction, the first sheet positioning member being configured to position the sheet supported on the bottom plate by contacting an upstream end portion of the sheet in the sheet supply direction; a moving member disposed at the sheet supply tray, the moving member being configured to move in the sheet supply direction in response to movement of the first sheet positioning member in the sheet supply direction, the moving member including a first detection portion; a detection unit configured to detect the first detection portion of the moving member to determine a position of the first sheet positioning member; a coupling member pivotally coupled at one end portion to the moving member and pivotally coupled at the other end portion to the first sheet positioning member, the coupling member being configured to move the moving member in response to the movement of the first sheet positioning member in the sheet supply direction; and a restriction mechanism configured to restrict movement of the coupling member, wherein the restriction mechanism is configured to restrict the movement of the coupling member such that, when an amount of the movement of the first sheet positioning member in the sheet supply direction is smaller than or equal to a specified amount, a central portion of the coupling member in a longitudinal direction thereof moves in the sheet supply direction together with the first sheet positioning member, and wherein the restriction mechanism is configured to restrict the movement of the coupling member such that, when the amount of the movement of the first sheet positioning member in the sheet supply direction exceeds the specified amount, the central portion of the coupling member is prevented from moving further in the sheet supply direction together with the first sheet positioning member and the coupling member pivotally moves about the central portion thereof. |
