A sheet feeding apparatus has a conveying roller, a separation member which presses against the conveying roller to form a separation nip portion that separates received sheets one by one, a feeding member configured to feed a sheet towards the separation nip portion, a nip guide member having a first guide portion configured to contact with a leading edge of the sheet fed by the feeding member and a second guide portion disposed at facing position to the conveying roller and configured to guide the sheet abutted with the first guide portion for the separation nip portion and a biasing member configured to bias the nip guide member. The nip guide member rotates around a rotation shaft and the second guide portion is disposed at predetermined distance from the conveying roller and moves in a direction of separating from the conveying roller against biasing force by the biasing member.

A sheet conveyance device includes a first conveyance member, and a drive transmission mechanism. The first conveyance member is configured to convey a sheet toward a second conveyance member. The drive transmission mechanism is configured to transmit a driving force of a driving source to the first conveyance member. The drive transmission mechanism includes a first drive transmitter and a second drive transmitter disposed coaxially with the first drive transmitter. The driving force is transmitted from the first drive transmitter to the second drive transmitter. The second drive transmitter is rotatable relative to the first drive transmitter within at least a predetermined angular range.

In a first mode, the control unit controls the driving source such that the rotary feeding member starts to move toward the first position based on an elapse of a first time since the detection portion detected a leading edge of the sheet, and positions the rotary feeding member at the first position when a trailing edge of the sheet passes through the separation nip. In a second mode, the control unit controls the driving source such that the rotary feeding member starts to move toward the first position based on an elapse of a second time longer than the first time since the detection portion detected the leading edge of the sheet, and positions the rotary feeding member at a position separated more from the stacking portion than the first position when the trailing edge of the sheet passes through the separation nip.

A paper separation structure arranged in an office machine, comprising: a separating roller set having a separating roller and a shaft, and a pick roller arranged to correspond to the separating roller set and contacted with the separating roller set, wherein the separating roller has a roller frame, a shaft hole is formed in the roller frame for accommodating the shaft, and a rubber layer connected with the pick roller, the shaft hole has a narrow inner diameter at a middle of the shaft hole and a wide inner diameter at opposite ends of the shaft hole to form two swing spaces between the middle of the shaft hole and opposite ends of the shaft hole, the roller frame and the rubber layer are swung about a joint between the middle of the shaft hole and the shaft.

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.

An image processing apparatus includes: a support surface configured to support a sheet, a sheet feeding roller configured to feed the sheet in a conveying direction, a separation member for separating the sheet one by one and positioned downstream of the sheet feeding roller in the conveying direction, and a regulating member displaceable between a first position where the regulating member abuts against a distal end of the sheet supported by the support surface to regulate passage of the sheet in the conveying direction between the sheet feeding roller and the separation member and a second position that is farther from a conveyance path than the first position and that allows passage of the sheet in the conveying direction. The regulating member has a wall surface that abuts against the distal end of the sheet and includes at least one protrusion on the wall surface.

A banknote validation device includes a light source array which includes multiple light emission units; a light receiver configured to receive light emitting from the light emission units and to generate, upon receiving the light emitting from the light emission units, a detection signal corresponding thereto; a banknote channel arranged between the light source array and the light receiver; and a control circuit electrically connected to the light source array and the light receiver. The banknote channel is configured to receive a banknote to be validated to pass therethrough. The light receiver is arranged to correspond to multiple light emission units. The control circuit is configured to control the light emission units of the light source array to sequentially emit light according to a preset timing sequence of lighting. The present invention allows for inspection of a banknote to be validated with a simplified structure at the same accuracy.

A sheet feeding device includes a pickup roller, a feed roller, a retard roller, a conveyance rollers pair. The pickup roller contacts a sheet at a first contact point in a pickup position and rotates to convey the sheet in a predetermined conveyance direction. The feed roller is disposed on a downstream side of the pickup roller in the conveyance direction. The retard roller contacts the feed roller at a second contact point and conveys the sheet while separating the sheet. The conveyance rollers pair contacts each other at a third contact point and conveys the sheet passing through the second contact point to a conveyance path. The first contact point, the second contact point and the third contact point are disposed on a linear line in the conveyance direction, when viewed from axial directions of the rollers.

A used paper supply device includes a first paper feed unit and a second paper feed unit for feeding used paper and cleaning unit for cleaning a surface of a roller of the paper feed units, in which when the used paper is fed from the first paper feed unit, the surface of the roller of the second paper feed unit is cleaned.

A document conveyance apparatus includes a feed roller, a first and a second conveyance rollers, a conveyance shaft, an arm portion rotatably moving the feed roller to a standby position to a feeding position, a transmission portion transmitting rotation of the conveyance roller shaft to the arm portion, and a torque limiter. The feed roller and the first conveyance roller rotate in a conveyance direction when the conveyance roller shaft rotates in a first direction, and the feed roller moves from a feeding position to a standby position when the conveyance roller shaft rotates in a second direction. When a document fed by the second conveyance roller moves through a nip portion, a transmission portion does not transmit rotation of the first conveyance roller rotated in the second direction by the separation roller to an arm portion by operation of the torque limiter.