A sheet supplying apparatus, which is capable of winding a sheet tightly, includes a driving unit configured to cause a roll including a wound consecutive sheet to rotate in a first direction for feeding the sheet or a second direction opposite to the first direction, a sensor that detects a leading end portion of the sheet separated from an outer circumferential surface of the roll, and a contact body that presses the outer circumferential surface. Before the sheet is fed, in a state in which the contact body presses the outer circumferential surface, the driving unit causes the roll to continuously rotate in the second direction until a detection cycle of the leading end portion by the sensor is less than a predetermined value.

A post-processing apparatus includes a conveyance unit, a discharge port, a tray, an elevation unit, a detection unit, and a control unit. The conveyance unit conveys a print medium supplied from an image forming apparatus. The discharge port discharges the print medium conveyed by the conveyance unit. The tray is stacked with the print medium discharged from the discharge port and can be raised and lowered in a vertical direction. The elevation unit raises and lower the tray in the vertical direction. The detection unit detects a top surface of an uppermost print medium of one or more sheets of print media stacked on the tray. The control unit controls the conveyance unit and the elevation unit and hold a relative position of the top surface with respect to the discharge port if the print medium is discharged from the discharge port at a first position. The control unit causes the conveyance unit to convey the print medium at a first speed if a discharge time from a first timing indicating the timing relating to discharge of the print medium from the discharge port to a second timing indicating the timing when the print medium is detected by the detection unit is a first time and causes the conveyance unit to convey the print medium at a second speed different from the first speed if the discharge time is a second time.

A post-processing apparatus includes a conveyance unit, a discharge port, a tray, an elevation unit, a detection unit, and a control unit. The conveyance unit conveys a print medium supplied from an image forming apparatus. The discharge port discharges the print medium conveyed by the conveyance unit. The tray is stacked with the print medium discharged from the discharge port and can be raised and lowered in a vertical direction. The elevation unit raises and lower the tray in the vertical direction. The detection unit detects a top surface of an uppermost print medium of one or more sheets of print media stacked on the tray. The control unit controls the conveyance unit and the elevation unit and hold a relative position of the top surface with respect to the discharge port if the print medium is discharged from the discharge port at a first position. The control unit causes the conveyance unit to convey the print medium at a first speed if a discharge time from a first timing indicating the timing relating to discharge of the print medium from the discharge port to a second timing indicating the timing when the print medium is detected by the detection unit is a first time and causes the conveyance unit to convey the print medium at a second speed different from the first speed if the discharge time is a second time.

A post-processing apparatus includes a side edge alignment section configured to move to a first position, a second position, that is farther from the side edges in the width direction than the first position, and a third position, that is between the first position and the second position in the width direction. The post-processing apparatus is configured to execute an adjustment operation of moving the side edge alignment section from the second position to the third position and an alignment operation of aligning the medium by causing the side edge alignment section to abut on the medium in the first position. The adjustment operation is executed while the first transport section transports the medium and the alignment operation is executed after the adjustment operation is performed and after the medium reaches a tip end alignment section.

A post-processing apparatus includes a side edge alignment section configured to move to a first position, a second position, that is farther from the side edges in the width direction than the first position, and a third position, that is between the first position and the second position in the width direction. The post-processing apparatus is configured to execute an adjustment operation of moving the side edge alignment section from the second position to the third position and an alignment operation of aligning the medium by causing the side edge alignment section to abut on the medium in the first position. The adjustment operation is executed while the first transport section transports the medium and the alignment operation is executed after the adjustment operation is performed and after the medium reaches a tip end alignment section.

An example paper feed device includes a tray to feed printing paper, a magnetic force generation element to generate a magnetic flux, a 3D magnetic sensor to detect changes in the a density of the magnetic flux generated by the magnetic force generation element in each of three axes, and a controller. The tray has a movable element that is movable in relation to the printing paper. Either the magnetic force generation element or the 3D magnetic sensor is attached to the movable element. The controller determines the position of the movable element based on a detection signal received from the 3D magnetic sensor.

An example paper feed device includes a tray to feed printing paper, a magnetic force generation element to generate a magnetic flux, a 3D magnetic sensor to detect changes in the a density of the magnetic flux generated by the magnetic force generation element in each of three axes, and a controller. The tray has a movable element that is movable in relation to the printing paper. Either the magnetic force generation element or the 3D magnetic sensor is attached to the movable element. The controller determines the position of the movable element based on a detection signal received from the 3D magnetic sensor.

A sheet transport device includes a transport guide for guiding, along its transport surface, a sheet in a transport direction, a first transport roller pair, a second transport roller pair, a skew roller pair, a reference wall, and an actuator. The skew roller pair alone transports, in a skewed manner toward an end of the transport surface in a width direction orthogonal to the transport direction, the sheet spaced from the first transport roller and the second transport roller. The reference wall is positioned at the end of the transport surface in the width direction and extends along the transport direction. The actuator is disposed downstream of the skew roller pair and upstream of the second transport roller pair in the transport direction and between the end and a center of the transport surface in the width direction.

A sheet transport device includes a transport guide for guiding, along its transport surface, a sheet in a transport direction, a first transport roller pair, a second transport roller pair, a skew roller pair, a reference wall, and an actuator. The skew roller pair alone transports, in a skewed manner toward an end of the transport surface in a width direction orthogonal to the transport direction, the sheet spaced from the first transport roller and the second transport roller. The reference wall is positioned at the end of the transport surface in the width direction and extends along the transport direction. The actuator is disposed downstream of the skew roller pair and upstream of the second transport roller pair in the transport direction and between the end and a center of the transport surface in the width direction.

A magazine for packs of blanks includes a vertical channel configured for inserting and extracting packs of blanks, a succession of groups of supporting parts movable between a retracted position to allow the packs of blanks to move along the channel towards a portion under the supporting part, and an at least partly extracted position, in which the supporting part intercepts a pack of blanks moving down the channel and provides a steady support for the pack of blanks, and transmission means configured to automatically move each supporting part from the retracted position to the at least partly extracted position when the supporting part immediately below it intercepts a respective pack of blanks, thereby defining the steady support.