An image forming apparatus includes an image forming unit configured to form an image on a sheet, a duplex conveyance path through which the sheet having the image formed by the image forming unit on a first side passes when an image is formed on a second side that is a back side of the first side, a guiding member provided along the duplex conveyance path, a reversing roller pair capable of rotating in a forward direction and in a reverse direction, h, and a conveyance roller pair provided on the duplex conveyance path, wherein at least one of the reversing roller pair is inclined to the width direction so that, in the width direction, the side end of the sheet being conveyed by the reversing roller pair rotating in the reverse direction moves closer to the contact portion.

There is provided a conveyance apparatus including: a conveyance roller; a plurality of driven rollers; a plurality of roller holders; an biasing member biasing each of the roller holders toward a first position; and a movable member having a plurality of cam portions. Each of the cam portions has: a first inclined surface abutting against one of the roller holders from a side of one of the driven rollers, during a movement process of the movable member from a third position to a fourth position, to thereby move one of the roller holders from the first position toward a second position; and a second inclined surface arranged upstream of the first inclined surface in a moving direction, and abutting against one of the roller holders from the side of one of the driven rollers, during the movement process of the movable member from the third position to the fourth position.

A system and method for user friendly replacement of printer platen rolls includes a roll assembly having a support shaft with a bearing seated in a flange at one end. A crescent notch in a printer chassis receives the shaft into an interior of the notch. The assembly is moved axially so that a flange neck nests in the notch with a flange lip contacting a surface of the chassis. A lock contacts the lip to prevent axial motion of the assembly when installed. An opposed side of the shaft is placed in a bearing on an opposite side of the chassis.

A sheet conveying device includes a driving roller, a driven roller and a pair of bearing members. The pair of bearing members is configured to rotatably support both ends of a rotating shaft of the driven roller. The bearing member has a supporting part and a pressing part. The supporting part is formed by winding an end portion on one side of a wire rod in a spiral shape. The supporting part has a shaft hole through which one end of the rotating shaft can be inserted. The pressing part is formed by winding an end portion on the other side of the wire rod in a spiral shape in an orthogonal direction to the rotating shaft. The pressing part is disposed so as to press the supporting part in a direction in which the driven roller comes into pressure contact with the outer face of the driving roller.

A sheet conveyance apparatus includes a conveyance roller, a first rotary member forming a first nip portion conveying a sheet in a first conveyance direction, a rotation axis of the first rotary member being inclined with respect to a rotation axis of the conveyance roller such that a center of one end of the first rotary member is positioned at a different position in the first conveyance direction with respect to a center of the other end, and a second rotary member forming a second nip portion conveying a sheet in a second conveyance direction, a rotation axis of the second rotary member being inclined with respect to the rotation axis of the conveyance roller such that a center of one end of the second rotary member is positioned at a different position in the second conveyance direction with respect to a center of the other end.

A sheet conveying device includes a drive roller, a driven roller, a guide, and a pressure mechanism. The drive roller rotates to convey a sheet in a sheet conveyance path. The driven roller is driven by the drive roller to rotate and convey the sheet in the sheet conveyance path with the drive roller. The guide has a center of rotation coaxially disposed with a center of rotation of the driven roller. The guide is rotated between a guide position and an open position, guides the sheet conveyed in the sheet conveyance path at the guide position, and opens open the sheet conveyance path at the open position. The pressure mechanism is disposed on the guide to press the driven roller to the drive roller in a pressure direction at a given contact pressure. The driven roller moves relative to the drive roller in an orthogonal direction to the pressure direction in conjunction with the guide rotating.

A system and method for user friendly replacement of printer platen rolls includes a roll assembly having a support shaft with a bearing seated in a flange at one end. A crescent notch in a printer chassis receives the shaft into an interior of the notch. The assembly is moved axially so that a flange neck nests in the notch with a flange lip contacting a surface of the chassis. A lock contacts the lip to prevent axial motion of the assembly when installed. An opposed side of the shaft is placed in a bearing on an opposite side of the chassis.

A medium conveying apparatus includes a driving roller, a plurality of driven rollers, a support part, a plurality of upstream restriction parts and a plurality of downstream restriction parts. The support part supports the driven rollers. The upstream restriction parts are provided in the support part between the adjacent driven rollers. The downstream restriction parts are provided in the support part between the adjacent driven rollers. The upstream restriction parts and the downstream restriction parts are arranged on an upstream side and a downstream side in a conveyance direction of the medium across a rotational center of the driven rollers respectively. When the driven rollers are tilted with respect to the conveyance direction, at least one of the upstream restriction parts and the downstream restriction parts comes into contact with side surfaces of the driven rollers to restrict tilting of the driven rollers.

Perforated stretch film tube for forming a perforated stretch film hood. A length of flattened stretch film with a thickness of between 0.0025 and 0.0055 or larger is perforated after extrution and wound around a core to form a roll of perforated stretch film tube with a plurality of perforations spaced spaced by at least an inch and having a diameter of less than inch. The roll is loaded into a palletized load hooder machine, opened with gripping arms, sealed and cut at one end to form a pallet hood, and drawn down over the palletized load and released to secure the load to the pallet.