Sheet feeding device and image forming apparatus

An image forming apparatus comprising:

• a storage portion configured to store a sheet stack including a plurality of sheets;
• a setting unit configured to set a type of sheets that are stored in the storage portion;
• a lifting and lowering portion configured to move up and down the sheet stack stored in the storage portion;
• a feeding portion configured to feed a sheet from the sheet stack stored in the storage portion;
• a regulation member being movable and configured to regulate a position on a trailing edge side of the sheet stack stored in the storage portion in a feeding direction in which the feeding portion feeds a sheet;
• a display unit configured to display information;
• a trailing edge detection portion being movable together with the regulation member and configured to detect a sheet surface on the trailing edge side of the sheet stack;
• a control unit configured to perform a detection operation for detecting whether the regulation member is positioned to an end surface on the trailing edge side of the sheet stack based on a result of detection by the trailing edge detection portion, and configured to cause the display unit to provide a warning display if it is detected that the regulation member is not positioned to the end surface;
• and,
• a storage unit configured to store information indicating that it is detected that the regulation member is not positioned to the end surface and the warning display is not provided,
• wherein, in a case where it is detected that the regulation member is not positioned to the end surface and the warning display is not provided, the control unit causes the display unit to provide the warning display when the type of sheets is changed by the setting unit to a type of sheet other than a predetermined sheet, and
• wherein, in a case where the control unit has caused the display unit to provide the warning display in response to the type of sheets being changed by the setting unit to a type of sheet other than the predetermined sheet, the control unit deletes storage of the information.

A sheet feeding device connectable to an image forming apparatus including a setting unit configured to set a type of sheets that are stored in the sheet feeding device, and settable with at least a first type representing an envelope having thickness that is different between a leading edge side and a trailing edge side in a feeding direction and a second type representing a sheet different from the envelope, the sheet feeding device comprising:

• a storage portion configured to store a sheet stack including a plurality of sheets;
• an obtaining portion configured to obtain a type of sheet set by the setting unit;
• a lifting and lowering portion configured to move up and down the sheet stack stored in the storage portion;
• a feeding portion configured to feed a sheet from the sheet stack stored in the storage portion to the image forming apparatus connected to the sheet feeding device;
• a regulation member being movable and configured to regulate a position on a trailing edge side of the sheet stack stored in the storage portion in a feeding direction in which the feeding portion feeds a sheet;
• a trailing edge detection portion being movable together with the regulation member and configured to detect a sheet surface on the trailing edge side of the sheet stack;
• and
• a control unit configured to perform a determining operation for determining whether the regulation member is positioned to an end surface on the trailing edge side of the sheet stack based on a result of detection by the trailing edge detection portion, and configured to transmit, to the image forming apparatus, an instruction for providing a warning, if it is determined that the regulation member is not positioned to the end surface,
• wherein, in a case where a type of sheet obtained by the obtaining portion is the first type, the control unit does not transmit the instruction even if the sheet surface is not detected by the trailing edge detection portion, and
• wherein, in a case where a type of sheet obtained by the obtaining portion is the second type, the control unit causes the display unit to provide the warning display if the sheet surface is not detected by the trailing edge detection portion.