A medium conveying apparatus includes a driving force transmitting mechanism to transmit a driving force from a first motor to a brake roller and a pair of conveyance rollers located on the downstream side of the brake roller, and a processor to rotate the first motor forward to control so that a medium separated by the brake roller is conveyed by the pair of conveyance rollers, in a separation mode. The processor rotates the first motor backward to perform a feed operation by the brake roller and rotate the pair of conveyance rollers backward until a front edge of the medium passes through a position of the brake roller, and rotates the first motor forward to control so that the medium is conveyed by the pair of conveyance rollers after the front edge of the medium passes through the position of the brake roller, in a non-separation mode.

A medium conveying apparatus includes a setting member to set a torque limiter that defines a maximum torque applied to a brake roller to a first torque limiter or a second torque limiter, a unit including the first torque limiter, the second torque limiter and the brake roller, and a transmission member to transmit a drive force to the first torque limiter. The unit is swingably supported so that a predetermined force acts on the brake roller in a direction away from the feed roller when the driving force is transmitted. A force in a direction in which the brake roller presses the feed roller when the second torque limiter defines the maximum torque applied to the brake roller is greater than the force in the direction in which the brake roller presses the feed roller when the first torque limiter defines the maximum torque applied to the brake roller.

A sheet feeding apparatus is disclosed. This sheet feeding apparatus includes: a feeding roller configured to feed sheets; a conveying roller configured to convey the sheets fed by the feeding roller; a separation roller configured to form a nip portion by being pressed on the conveying roller, and to separate one by one the sheets at the nip portion, the sheets being conveyed by the conveying roller; a guide configured to guide the sheets fed by the feeding roller to the nip portion; and a holder configured to hold the separation roller and the guide, and to be detachably attachable to the sheet feeding apparatus. The guide adheres to the holder and the separation roller is replaceable on the holder that has been removed from the sheet feeding apparatus.

A medium feeding apparatus capable of switching between a first feeding mode and a second feeding mode, in which in the first feeding mode, when a first detection section positioned downstream of a feeding roller in a medium feeding direction detects passage of a trailing end of a preceding medium in a feeding standby state in which driving of the feeding roller that feeds the medium is stopped, starting the driving of the feeding roller to perform feeding of a succeeding medium, and in the second feeding mode, when a second detection section positioned downstream of the first detection section in the medium feeding direction detects the passage of the trailing end of the preceding medium in the feeding standby state, starting the driving of the feeding roller to perform the feeding of the succeeding medium.

A paper sheet folding device (sheet folding device) 160 includes a paper sheet folding unit 60 and a tray unit 110 that is provided on one side surface 161a of a device main body 161 and includes a lower discharge tray 121 on which a paper sheet S discharged through a lower discharge port 85 is loaded. The tray unit 110 is pivotable in an up-down direction about a pivotal shaft 111. A discharge drive mechanism 132 is disposed at a center portion of the tray unit 110 in a paper sheet width direction.

A sheet conveying apparatus includes a paper re-feeding path, a switching member, a reversing roller, a paper discharge roller, a motor, and a revolution control mechanism. The switching member can be switched between a first position and a second position. The reversing roller can reverse a revolving direction thereof between a first revolving direction and a second revolving direction. The paper discharge roller revolves in a third revolving direction for conveying the sheet in a third conveying direction. The motor reverses the revolving direction of the reversing roller and switches the position of switching member by reversing the revolving direction thereof. The revolution control mechanism revolves the paper discharge roller in the third revolving direction with the revolution of the motor, regardless of the reversing of the revolving direction of the motor.

A medium feeding apparatus includes a feeding roller, a separation roller which nips a medium between the separation roller and the feeding roller to separate the medium and to which a driving torque is applied by a driving source in a second rotation direction that is opposite to a first rotation direction in which the medium is fed to a downstream side, and a torque limiter that causes the separation roller to idle in the first rotation direction when a rotational torque applied to the separation roller in the first rotation direction exceeds a limit torque that is a predetermined upper torque limit, in which separation setting including a pressing load of the separation roller, a rotational speed of the separation roller, and the limit torque is changeable according to condition of feeding.

An image forming apparatus including a print engine to form an image on an image forming medium, a conveyance device to provide printing paper using a feed roller and a conveyance roller installed to face the feed roller to the print engine, a sensor to sense pressure applied to the conveyance roller, and a processor to identify whether double feed occurs on the basis of a signal provided from the sensor.

A media drive may include a media drive member, a shaft, a pick arm rotationally supporting the media drive member and a transmission operably coupling the shaft and the media drive member such that rotation of the shaft in a first direction drives the media drive member. A one-way clutch may be coupled to the shaft so as to be operably disengaged from the shaft in response to the shaft rotating in the first direction, wherein the one-way clutch is to rotate with the shaft in response to the shaft being rotated in a second direction opposite the first direction. A torque limiter may be connected to the one-way clutch to rotate with the one-way clutch, wherein the torque limiter is coupled to the pick arm to pivot the pick arm and the media drive member in response to the shaft being rotated in the second direction.

The present invention provides an image forming apparatus that reduces image artifacts caused by the back tension of a separating unit. A control unit decreases the number of rotations (the rotational speed) of a resist roller pair after the leading edge of a sheet reaches a transfer position.