A medium conveying apparatus includes a plurality of feed rollers, each feed roller rotating independently at a respective speed to feed a medium, a first sensor located on a downstream side of the plurality of feed rollers in a medium conveying direction and also in a central part in a direction perpendicular to the medium conveying direction, to detect the medium, a second sensor and a third sensor located on both sides of the first sensor in the direction perpendicular to the medium conveying direction, to respectively detect the medium, and a processor to change the speed of one of the plurality of feed rollers at least until the first sensor detects the medium when any of the second sensor or the third sensor detects the medium and the first sensor does not detect the medium within a predetermined time.

A medium conveying apparatus includes a first conveying path, a second conveying path that is connected to the first conveying path, a third conveying path that is connected to the first conveying path and the second conveying path, and a skew corrector that blocks a first space between the first conveying path and the second conveying path when a medium conveyed along the first conveying path is skewed, and retreats from the first space when the medium is not skewed, wherein the skew corrector retreats from a second space between the second conveying path and the third conveying path when blocking the first space, and blocks the third space between the first conveying path and the third conveying path when retreating from the first space.

A sheet processing apparatus includes a conveyance member to convey a sheet, a pair of alignment members to move relatively in a width direction orthogonal to a conveyance direction of the sheet by the conveyance member, so as to align a position of the sheet in the width direction, and a lower portion to support a lower surface of the sheet between the pair of alignment members in the width direction. In addition, a pair of upper portions are arranged on one side and the other side of the lower portion in the width direction and each hold an upper surface of the sheet, wherein the pair of upper portions is positioned lower than the lower portion in a plane vertical to the conveyance direction.

A printing apparatus includes a print unit configured to print an image on a print medium, a conveyance unit configured to convey a print medium to the print unit, a first feed unit configured to feed a first print medium to the conveyance unit, a second feed unit configured to feed a second print medium to the conveyance unit, and a control unit configured to control the first feed unit, the second feed unit, and the conveyance unit. The control unit is configured to start, in a state in which the first print medium is being conveyed by the conveyance unit, feeding of the second print medium to the conveyance unit by the second feed unit.

A first conveyor conveys a print medium in a conveyance direction from a holder toward a print head and in a return direction opposite to the conveyance direction. A tensioner applies back tension to the print medium between the holder and the first conveyor. A first motor drives the first conveyor. The controller controls the print head and the first motor. The controller performs a correction process of controlling the first motor to repeat a first conveyance and a second conveyance sequentially a plurality of times. The first conveyance is conveying the print medium in the conveyance direction in a state where the back tension is applied to the print medium by the tensioner. The second conveyance is conveying the print medium in the return direction in a state where the back tension is not applied to the print medium by the tensioner.

A sheet conveying device includable in an image forming apparatus that uses a method of conveying a conveyance target medium and a method of forming an image, includes a position detector, a position adjuster, and circuitry. The position detector is configured to detect a position of a conveyance target medium. Based on a detection of the position of the conveyance target medium by the position detector, the position adjuster moves in at least one of a width direction of the conveyance target medium and a rotation direction of the conveyance target medium within a plane of conveyance of the conveyance target medium and repeatedly adjusts the position of the conveyance target medium while conveying the conveyance target medium. The circuitry changes a conveying speed of the conveyance target medium, according to a change of the position of the conveyance target medium after adjusted by the position adjuster.

A sheet conveyance device capable of reducing occurrence of creases on a sheet. A pair of first conveyance rollers nip and convey a sheet. A pair of second conveyance rollers arranged downstream of the first conveyance rollers in a sheet conveyance direction nip and convey the sheet. A pair of registration rollers arranged downstream of the second conveyance rollers nip and convey the sheet after correcting skew of the sheet. A switching mechanism switches a state of the second conveyance rollers between a contact state and a separated state. A control unit that controls the rollers and the switching mechanism executes a first conveyance operation that conveys the sheet with the first conveyance rollers and the registration rollers after correcting the skew in the separated state and in a state where a sheet conveyance speed by the registration rollers is higher than that by the first conveyance rollers.

A conveyance device includes a conveyance roller, a registration roller, a sensor, a mode setting part, a storage, a conveyance state determination part and a drive control part. The mode setting part sets the mode to either a plain paper mode or a tab paper mode. The storage stores threshold information corresponding to the mode. The conveyance state determination part determines, when the plain paper mode is set, whether the conveyance state of the recording medium is a skew conveyance state or a tab paper conveyance state, based on the detection result of the sensor and the plain paper mode threshold information. The conveyance state determination part determines, when the tab paper mode is set, whether the conveyance state of the recording medium is the skew conveyance state or the tab paper conveyance state, based on the detection result of the sensor and the tab paper mode threshold information.

A sheet conveyance apparatus includes a conveyance roller, an abutment member including an abutment surface against which a side edge, in a width direction, of the sheet abuts, and configured to correct a skew of the sheet, an obliquely conveying roller configured to convey the sheet such as the side edge of the sheet is conveyed toward the abutment surface, a sheet side edge detection portion configured to detect a position of the side edge of the sheet, and a control unit configured to control that a conveyance force, in the width direction, by the obliquely conveying roller in response to a detection result of the sheet side edge detection portion becomes smaller than that in an abutment movement.

A correction structure arranged in a feeding path of a document processing device, comprising: a transmitting means consisted of at least a pair of roller set which are arranged symmetrically on the two sides of the feeding path for transmitting the card evenly, a correcting means consisted of a platform movably arranged at the downstream to the roller set, a receptacle formed on the platform, a elastomer arranged in the receptacle for returning the platform to a predefined location, a back wall extended from the platform toward the feeding path, an opening formed on the back wall to let a card go through, and a friction pad arranged at the bottom of the opening to partly jam the opening, wherein the width of the friction pad is less than the width of the feeding path so the friction pad only contacts the center of the card while transmitting the card.