A sheet feeding device includes a conveyance rotator, a separation rotator, a torque applier, a torque control circuit, and a torque transmission switcher. The conveyance rotator conveys a sheet in a sheet feeding direction. The separation rotator sandwiches the sheet together with the conveyance rotator. The torque applier applies a reverse torque to the separation rotator in a sheet reversing direction to reverse the sheet. The torque control circuit controls the reverse torque applied to the separation rotator to be equal to or less than a given value. The torque transmission switcher switches, between a transmission state and a non-transmission state, a state of a torque transmission path between the torque applier and the separation rotator. The transmission state is a state in which the reverse torque is transmitted. The non-transmission state is a state in which the reverse torque is not transmitted.

To provide a post-processor capable of executing alignment processing with high accuracy. Configuring a post-processor including: a recording material loader on which a recording material conveyed through a conveyance path is loaded; an aligner that aligns the recording material in the recording material loader; a driver that moves the aligner; and a controller that receives information of a physical property value of the recording material acquired by a medium sensor and determines an operation parameter of alignment processing that drives the driver based on the information of the physical property value.

A transport unit includes a glue belt, a pressurizing roller, a roller driving unit, and a control unit. The glue belt includes an adhesive layer. The pressurizing roller presses a medium against the adhesive layer while reciprocating in a Y direction. The roller driving unit generates a driving force for the pressurizing roller to reciprocate. The control unit controls the roller driving unit. The pressurizing roller is separated from the adhesive layer along with reciprocation. The control unit is capable of detecting a load of the roller driving unit, and determines whether the magnitude of the adhesive force of the adhesive layer is less than a target value, based on the load.

A method of operating a device to receive a print medium is disclosed. Rotation of a receiving device to receive a print medium is detected, whereby the rotation is caused by an external force. An assisting force is applied to further rotate the receiving device in response to the detected rotation.

A medium conveying apparatus includes a conveyance roller to convey a medium, an imaging device to image the medium, a DC motor to drive the conveyance roller, a processor to detect that a front end of the medium reaches between the conveyance roller and the imaging device, set a current limit value of the DC motor to a first limit value until the front end of the medium reaches between the conveyance roller and the imaging device, and change the current limit value to a second limit value larger than the first limit value after the front end of the medium has reached between the conveyance roller and the imaging device, and drive the conveyance roller by rotating the DC motor based on the second limit value when the imaging device performs imaging.

A post-processing unit includes a stapler, a driving section, and a controller. The stapler is moved in a Y direction and executes a stapling process on a paper sheet. The driving section moves the stapler in the Y direction. The controller controls an operation of the stapler and an operation of the driving section. The controller executes first control to supply a set current or a set voltage to the driving section, second control to supply, to the driving section, the same supply current as the set current or the same supply voltage as the set voltage, and third control to stop the supply of the supply current or the supply voltage. When the stapler executes the stapling process a plurality of times, the controller repeatedly executes the second control and the third control and causes the stapler to execute the stapling process during the execution of the second control.

An image forming apparatus includes a main body, a sheet cassette attachable to the main body and configured to support one or more sheets to be supplied to the image forming unit, and a controller. The main body includes an electrode movable relative to the main body, a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the electrode, and a wire. The sheet cassette includes a metal member, and a sheet supporting plate made of metal, movable relative to the sheet cassette in an up-down direction, and configured to support one or more sheets from below. The controller is configured to determine whether the sheet cassette is at an installation position in the main body from a level of the value of the signal outputted from the capacitance detector connected to the electrode via the wire.

An image forming apparatus includes a main body, a sheet cassette attachable to the main body and configured to support one or more sheets to be supplied to the image forming unit, and a controller. The main body includes an electrode movable relative to the main body, a capacitance detector configured to output a signal indicating a value corresponding to a quantity of electricity stored in the electrode, and a wire. The sheet cassette includes a metal member, and a sheet supporting plate made of metal, movable relative to the sheet cassette in an up-down direction, and configured to support one or more sheets from below. The controller is configured to determine whether the sheet cassette is at an installation position in the main body from a level of the value of the signal outputted from the capacitance detector connected to the electrode via the wire.

A method of transporting a plurality of sheet-like members containing a magnetic material includes a first step of placing one of the members on an endless belt, and a second step of releasing the member from a portion of the endless belt which is moved and folded back along a roller. The endless belt includes a first magnetic force generating portion that generates first magnetic force, and a second magnetic force generating portion that generates second magnetic force that is stronger than the first magnetic force. In the first step, the member is placed on the belt, such that a first portion of the member containing the magnetic material is located in the first magnetic force generating portion, and a second portion of the member containing the magnetic material and located rearward of the first portion in a conveying direction is located in the second magnetic force generating portion.

A sheet feeding apparatus includes a supporting portion, a regulating unit supported to be movable in a first direction, a feed unit, a variable resistor including a rotary member configured to be rotated by a movement of the regulating unit in the first direction, and having a resistance value changing according to a rotational phase of the rotary member, an interlocking portion configured to rotate the rotary member in conjunction with the regulating unit, and a substrate including a pattern surface to which the variable resistor is connected. An axial center line of the rotary member extends in a second direction orthogonal to the first direction and a direction of gravitational force. The substrate is disposed such that the pattern surface extends in parallel with the first direction and the direction of gravitational force.