A sheet processing apparatus is described. The sheet processing apparatus includes a housing section, a conveyance mechanism and a controller. The housing section accommodates a sheet. The conveyance mechanism conveys the sheet accommodated in the housing section to a predetermined position at the downstream side in a sheet conveyance direction. The controller controls the conveyance mechanism to remove a needle-free binding section of a sheet bundle if a conveyance jam of the sheet occurs.

A sheet feeding apparatus includes a sheet supporting portion configured to support a sheet, a feeding member configured to contact an upper surface of the sheet supported on the sheet supporting portion and feed the sheet, a drive motor configured to rotate in a first direction and in a second direction opposite to the first direction, and a lifting mechanism connected to the drive motor and configured to lift the sheet supporting portion and lower the feeding member in a case where the drive motor rotates in the first direction, and to lower the sheet supporting portion and lift the feeding member in a case where the drive motor rotates in the second direction.

A document conveyance device includes a feed roller, a separation roller, a first motor for generating a first drive force for driving the separation roller, a planet gear, a drive gear, a second motor for generating a second drive force, and a position switching mechanism for switching a position of the planet gear from a first position in which the planet gear is separated from the drive gear and does not transmit the first drive force to the separation roller to a second position in which the planet gear engages with the drive gear and transmits the first drive force to the separation roller, based on the second drive force. The position switching mechanism includes a support member for supporting the planet gear, and a transfer mechanism for moving the support member so that the planet gear engages with the drive gear, based on the second drive force. The further movement of the planet gear is prevented after the planet gear engaged with the drive gear.

A clutch device includes a drive transmitting shaft; a driving-side engaging member; and a driven-side engaging member. A driving force is transmitted from the driving-side engaging member to the driven-side engaging member. The driving-side engaging member has a driving-side clutch tooth, and the driven-side engaging member has a driven-side clutch tooth capable of being engaged with and released from the driving-side clutch tooth. The driving-side clutch tooth and the driven-side clutch tooth have drive transmitting surfaces inclined so as to axially attracting each other in engagement with each other. At least one of the driving-side clutch tooth and the driven-side clutch tooth has a functional surface on a free end side relative to the drive transmitting surface with respect to the engaging direction. The functional surface is inclined so as to axially separating from a surface of the other clutch tooth in engagement therewith.

A method for removing outer layer of rollstock includes: first step of cutting rollstock's outermost circumferential film in a first cut portion, the rollstock formed by a film sheet rolled from base end to tip end and the tip end temporarily fixed to an outer circumferential surface; second step of cutting the film in a second cut portion closer to the base end than the first cut portion, a length from the tip end to the second cut portion being equal to or more than one round of the rollstock's outermost circumference; and step of discarding a first cut-film piece from the first cut portion to the tip end and a second cut-film piece from the first cut portion to the second cut portion by drawing the first and second pieces with a drawing device while driving an unwinding roller mounted with a hollow portion of the rollstock to rotate.

A medium feeding device includes a medium feeding mechanism switching between a first state in which the medium is fed from the feeding tray and a second state in which the medium is not fed from the feeding tray, a feeding roller rotationally driven in a forward rotation direction, and a separation roller that is rotationally driven in the reverse rotation direction when the feeding roller is rotationally driven in the forward rotation direction, wherein when the separation roller is rotationally driven in the forward rotation direction, the feeding roller is configured to be passively rotatable with respect to the separation roller, and wherein a rotation direction of the first motor when the cam member switches the medium feeding mechanism from the first state to the second state is the same as a rotation direction of the first motor when the separation roller rotates in the forward rotation direction.

A medium feeding device includes a medium feeding mechanism switching between a first state in which the medium is fed from the feeding tray and a second state in which the medium is not fed from the feeding tray, a feeding roller rotationally driven in a forward rotation direction, and a separation roller that is rotationally driven in the reverse rotation direction when the feeding roller is rotationally driven in the forward rotation direction, wherein when the separation roller is rotationally driven in the forward rotation direction, the feeding roller is configured to be passively rotatable with respect to the separation roller, and wherein a rotation direction of the first motor when the cam member switches the medium feeding mechanism from the first state to the second state is the same as a rotation direction of the first motor when the separation roller rotates in the forward rotation direction.

An image forming apparatus includes a tray; a casing having a first outlet, a second outlet above the first outlet, a first path, and a second path; a stack lever; a drive source; and a controller. The second path communicates with the second outlet such that a sheet conveyed along the second path is partially discharged from the second outlet and is reversed along the second path. The first outlet communicates with the first path such that the sheet conveyed along the first path is discharged from the first outlet onto the tray. The stack lever is movable between a first position where the stack lever presses a sheet on the tray and a second position higher than the first position. The controller is configured to control the drive source such that, when the sheet is discharged from the second outlet, the stack lever is at the second position.

An image forming apparatus includes a tray; a casing having a first outlet, a second outlet above the first outlet, a first path, and a second path; a stack lever; a drive source; and a controller. The second path communicates with the second outlet such that a sheet conveyed along the second path is partially discharged from the second outlet and is reversed along the second path. The first outlet communicates with the first path such that the sheet conveyed along the first path is discharged from the first outlet onto the tray. The stack lever is movable between a first position where the stack lever presses a sheet on the tray and a second position higher than the first position. The controller is configured to control the drive source such that, when the sheet is discharged from the second outlet, the stack lever is at the second position.

Examples of stalling of operation of imaging devices are described herein. In an example, the imaging device includes an input roller assembly to transport a medium in the imaging device and a line feed roller assembly disengagably coupled to the input roller assembly to selectively drive the input roller assembly. To stall the operation of the imaging device, a line feed shaft of the line feed roller assembly can be automatically disengaged from the input roller assembly to discontinue advance of the medium along a print path.