A sheet conveyance device includes a pair of conveyance rollers, a contact-release mechanism, an alignment mechanism, and a control portion. The contact-release mechanism moves first and second conveyance rollers, constituting the pair of conveyance rollers, into contact with and away from each other. The alignment mechanism aligns a sheet conveyed along the sheet conveyance passage in a sheet width direction. The alignment mechanism includes a pair of alignment members movable toward and away from each other in the sheet width direction and aligning the sheet in the sheet width direction by making contact, from both sides in the sheet width direction, with side edges of the sheet. The control portion controls the contact-release mechanism to move the first and second conveyance rollers away from each other, and aligns the sheet with the pair of alignment members located opposite each other in the sheet width direction.

The present invention provides a system 100 for a paper folding machinery 200. The paper folding machinery 200 includes a roller folding unit, a strip directing The strip directing unit 220 directs a strip 300 received from the roller folding unit 210 in a predefined direction and at least one folding unit 230 folds the strip 300 received from the strip directing 200 unit 220. The system 100 includes a detecting unit 20 and mounting units 30a & 30b. The detecting unit 20 detects misalignment of the strip 300 on the strip directing unit 220 and at least one folding unit 230. Each of the mounting unit 30a and 30b enables movements in at least one direction of the strip directing unit 220 and the folding unit 230 respectively mounted thereon for correcting the misalignment of the strip 300 thereon.

A sheet feeding mechanism includes a feeding path, at least one card feeding roller mounted to the feeding path, at least one paper feeding roller coaxial with the at least one card feeding roller, at least one card idle roller contacting with the at least one card feeding roller, at least one paper idle roller contacting with the at least one paper feeding roller, at least one elastic unit connected to the feeding path, and a stroke limiting unit. The at least one elastic unit is fastened to the feeding path. The at least one elastic unit has a stretching stroke. The stroke limiting unit controllably shortens the stretching stroke.

A paper feeding mechanism includes a feeding path, a driving motor, a bidirectional transmission mechanism, at least one feeding roller, a unidirectional transmission mechanism and at least one blocking roller. The driving motor is controllable to output a driving force towards a forward direction or a driving force towards a reverse direction. The bidirectional transmission mechanism is connected to the driving motor. The at least one feeding roller is mounted in the feeding path. The at least one feeding roller is connected to the bidirectional transmission mechanism. The unidirectional transmission mechanism is connected to the driving motor. The at least one blocking roller is mounted in the feeding path. The at least one blocking roller is disposed to a downstream of the at least one feeding roller. The at least one blocking roller is connected to the unidirectional transmission mechanism.

A sheet post-processing device is connected to a punch processing unit. The punch processing unit includes a skew detection unit and a punch unit. The skew detection unit detects a skew amount of a sheet. The punch unit forms punch holes at positions of the sheet according to the skew amount. The sheet post-processing device includes a processing tray, a paddle, a driver, and a control unit. The sheet of which the skew amount is detected by the skew detection unit is mounted on the processing tray. The paddle conveys the sheet on the processing tray by a paddle operation. The driver drives the paddle to perform the paddle operation. The control unit is configured to operate the driver to control a number of times the paddle operation is performed by the paddle based on the skew amount.

An image forming device includes an image forming unit, a reading unit, a registration-less unit, and an engine control unit. The reading unit reads a sheet to be conveyed. The engine control unit moves the other end side of the registration-less unit to correct skew. The engine control unit obtains a deviation amount (first deviation amount) of the position of the sheet based on the correction, and changes a sheet conveyance speed from a first speed to a second speed when the sheet enters the registration-less unit. The engine control unit adjusts the timing to change from the first speed to the second speed based on the first deviation amount.

A sheet conveyance apparatus includes a conveyance roller, an abutment member including an abutment surface, an obliquely conveying roller configured to convey the sheet such that the side edge portion is moved toward the abutment surface, a sheet side-edge detection portion, and a controller. The controller is configured to control the conveyance force of the obliquely conveying roller at a first conveyance force until a predetermined time has elapsed, in an abutment operation in which the sheet is abutted against the abutment surface by the obliquely conveying roller, and control the conveyance force of the obliquely conveying roller at a second conveyance force larger than the first conveyance force if the predetermined time has elapsed and the position of the side edge portion of the sheet detected by the sheet side-edge detection portion is out of a predetermined range.

A sheet transport system for moving a sheet in a transport direction while adjusting a position of the sheet in a lateral direction normal to the transport direction to a target position, includes first and second pinch roller sets spaced apart from one another in the transport direction, each pinch roller set including two pairs of pinch rollers spaced apart from one another in the lateral direction, each pair forming a nip for pinching and driving the sheet with an individually controllable speed; a detection system for detecting a position of the sheet in the lateral direction while the sheet is pinched by the first pinch roller set; and a control system configured for carrying out the following actions: by controlling the speeds of the pinch rollers of the first pinch roller set before the sheet has reached the second pinch roller set, rotating the sheet by a first rotation angle for adjusting a given reference point on a leading part of the sheet to its target position; and when the sheet has left the first pinch roller set and while the reference point travels along a path segment that is symmetric with respect to the second pinch roller set, rotating, by controlling the speeds of the pinch rollers of the second pinch roller set, the sheet by a second rotation angle for aligning a leading edge of the sheet in the lateral direction.

A document conveying device includes a document tray, a first rotary member, a first motor, a second rotary member, a second motor, a document feed sensor, and a controller. The controller counts a counted time from the time point that the first motor starts to rotate until the leading end of a document reaches the document feed sensor. When the time resulting from subtracting the counted time from a required sheet-to-sheet time interval is longer than the required speed change time, the controller performs deceleration and post-deceleration acceleration for the first motor. The required speed change time is the time required for speed change from the first rotation speed to the second rotation speed.

An image forming system includes an image forming apparatus including an image forming unit and a first control unit which controls the image forming unit, a varnish application apparatus provided downstream in a sheet conveyance direction with respect to the image forming apparatus and including a varnish application unit which applies varnish to a sheet and a second control unit which controls the varnish application unit, and a sheet conveyance apparatus provided between the image forming apparatus and the varnish application apparatus in the sheet conveyance direction and including a receiving roller which receives a sheet discharged from the image forming apparatus, a processing unit which performs predetermined processing on a sheet present in the sheet conveyance apparatus, and a third control unit which controls the processing unit, wherein the first control unit is capable of communicating with the second control unit and the third control unit.