Provided is an image forming apparatus that together with being able to suppress rotation unevenness is capable of preventing unexpected downtime due to a broken belt. A guide member guides the swing of a swing gear on an arc that connects a first position where the swing gear is engaged with an idle gear, and a second position where the swing gear is not engaged with the idle gear. A transmission cutoff mechanism cuts off transmission of a drive force transmitted to a driven pulley via a belt to a driven shaft when a motor rotates in the reverse direction. A control unit, in a case where rotation unevenness meets a condition, causes the swing gear to swing to the first position by reverse rotation of the motor, which causes the drive force to be transmitted to the driven shaft.

A sheet conveying apparatus may comprise a first conveying roller configured to convey a sheet and a second conveying roller disposed on a downstream side of the first conveying roller in a conveyance direction of the sheet. In a case where the second conveying roller rotates at a first speed by a driving force being transmitted to the second conveying roller, the first conveying roller rotates by being driven with respect to the second conveying roller. In a case where the second conveying roller rotates at a second speed faster than the first speed by the driving force being transmitted to the second conveying roller, the first conveying roller rotates at the second speed.

A drive transmission apparatus includes a first rotating unit rotated by driving force from a drive source and a second rotating unit rotated by the first rotating unit. The first and second rotating units include a first gear pair meshing at a first transmission ratio and second gear pair meshing at a second transmission ratio. A retention mechanism includes a protruded portion provided on the first rotating unit and a recessed portion provided on the second rotating unit, and is configured to retain a rotation angle of the second rotating unit by an engagement of the protruded portion and the recessed portion in a state where the first and second gear pairs are unmeshed.

A medium issuing device for issuing a medium includes a drive part which drives a conveyance mechanism for conveying the medium in a conveyance passage, a printing part which reads out printing data and prints on the medium according to drive by the drive part, and a control part which acquires enlarged printing data when code data are included in the printing data, the enlarged printing data being enlarged in a conveyance direction of the medium with respect to an original size which do not include the code data, and the control part controls a driving speed of the drive part to a lower speed than a normal driving speed according to an enlargement ratio at least in a portion of the code data.

A recording medium processing apparatus that performs processing on a recording medium bundle includes an advancing member that advances from a side facing one surface of the recording medium bundle toward the recording medium bundle and presses the recording medium bundle; a transporter that transports the recording medium bundle to a downstream side in a direction of movement of the recording medium bundle so that a portion of the recording medium bundle that is being pressed by the advancing member moves ahead of other portions; and a processor configured to change at least one of an advancing velocity of the advancing member and a transport velocity at which the recording medium bundle is transported by the transporter on a basis of medium information, which is information on the recording medium bundle, and/or apparatus information, which is information on the recording medium processing apparatus.

A drive transmission device (6) includes a first drive train (62) and a second drive train (63). The first drive train (62) includes a first gear (621), a second gear (622), a rotary shaft (623), and one-way clutches (624). The second drive train (63) includes a third gear (631), a fourth gear (632), a rotary shaft (633), and an electromagnetic clutch (634). The third gear (631) engages the first gear (621) and the fourth gear (632) engages the second gear (622). A rotational speed of a pickup roller (12) is switched by switching on/off the electromagnetic clutch (634) to change a transmission path of driving force.

A drive transmission apparatus includes a first rotating unit rotated by driving force from a drive source and a second rotating unit rotated by the first rotating unit. The first and second rotating units includes first gear pair meshing at a first transmission ratio and second gear pair meshing at a second transmission ratio. A retention mechanism includes a protruded portion provided on the first rotating unit and a recessed portion provided on the second rotating unit, and is configured to retain a rotation angle of the second rotating unit by an engagement of the protruded portion and the recessed portion in a state where the first and second gear pairs are unmeshed.

A sheet material feeding apparatus includes a first roll 106, and a second roll 108 arranged vertically below first roll 106, to feed a sheet material clamped between the first roll 106 and the second roll 108. The sheet material feeding apparatus further includes a first motor 102 provided with a rotatable first motor shaft 104 coupled to the first roll 106, and a second motor 103 provided with a rotatable second motor shaft 105 coupled to the second roll 108. The first motor shaft 104 and the second motor shaft 105 rotate at substantially the same rotation speed to allow the first roll 106 and the second roll 108 to rotate in synchronization with each other.

A sheet conveyance apparatus includes a first conveyance unit, a second conveyance unit, a drive source, and a drive transmission unit. When the first conveyance unit conveys a sheet in a second conveyance direction and the second conveyance unit does not convey the sheet, the drive transmission unit enters a second transmission state in such a manner that the first conveyance unit conveys the sheet at a first conveyance speed. The second conveyance unit conveys the sheet at a second conveyance speed higher than the first conveyance speed. From a contact state in which the sheet conveyed in the second conveyance direction is in contact with both the first conveyance unit and the second conveyance unit is caused, until the contact state is released, the drive transmission unit is kept in a non-transmission state.

Disclosed is a corrugated paperboard sheet feeding apparatus which comprises: a plurality of sheet feeding rollers rotatable to feed a bottommost one of a plurality of stacked corrugated paperboard sheets; an up-and-down member movable up and down with respect to the plurality of sheet feeding rollers; a drive motor; a motion conversion mechanism configured to convert a unidirectional rotation of the drive motor into a motion for causing the up-and-down member to be moved up and lowered, and transmit the converted motion to the up-and-down member; and an up-and-down control section configured to perform variable speed control for the unidirectional rotation of the drive motor, according to a given up-and-down speed control pattern, wherein the up-and-down control section is operable to change the up-and-down speed control pattern in conformity to a sheet length of the corrugated paperboard sheet in a feeding direction.