An image forming apparatus includes an image bearing member, an image forming portion, an endless belt, a plurality of stretching rollers including an inner roller, an outer roller, a position changing mechanism capable of changing a position of the inner roller to a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt, a feeding member, a feeding member driving portion, and a controller. A feeding start timing of a recording material by the feeding member depends on the position of the inner roller during transfer of a toner image onto the recording material.

An image forming apparatus includes a controller configured to control a conveyance portion to apply a first suction force to a circumferential surface while conveying a sheet from a transfer portion to a fixing portion by a conveyance portion. The controller is configured to execute a first switching process of switching the suction force applied to the circumferential surface from the first suction force to the second suction force while rotating the belt, in a case where a leading end of the sheet has reached the fixing nip portion in a state in which the sheet is nipped by the transfer nip portion.

A sheet conveying apparatus includes a transmitting mechanism, a movable member, and a control portion to input a signal having first and second levels. The transmitting mechanism transmits driving force and includes a spring clutch and an electromagnetic clutch. The driving force pivotally moves the movable member. The spring clutch idles by a slackness of a spring when the rotation in a second direction is inputted to the transmitting mechanism and the movable member is regulated from pivoting at a predetermined position. The control portion inputs the signal to the transmitting mechanism such that the state electromagnetic clutch state changes the engagement state to the disengagement state through an intermediary state gradually varying a length of time where the signal of the first level is inputted into the electromagnetic clutch after the movable member reaches the predetermined position by inputting the rotation in the second direction to the transmitting mechanism.

A control device, to control a system having an image forming apparatus to form an image on a sheet based on an image forming job and a sheet discharge apparatus having stacking trays for the sheet, includes a storage storing stacking state information for each stacking tray, a generator, a display controller, and an input portion. The generator generates a system configuration image, and a sheet bundle image representing a sheet bundle stacked on each stacking tray based on the stored stacking state information. The display controller displays a screen in which the sheet bundle image is combined at a position of each stacking tray in the system configuration image. The input portion inputs designation of an image forming job corresponding to sheets to be taken out. The display controller displays an order of taking out the sheets corresponding to the image forming job designated through the input portion.

A control apparatus to control a system including an image forming apparatus and a sheet discharge apparatus. The control apparatus receives configuration information of the system, and discharge state information having a discharge destination and a stacking amount of sheets discharged by the sheet discharge apparatus, and job identification information of an image forming job of sheets to be picked up. The control apparatus generates a system configuration image based on the configuration information, generates a sheet bundle image based on the discharge state information, combines the sheet bundle image with the system configuration image based on the discharge destination, and displays them as combined. The sheet bundle image is displayed with a size corresponding to the stacking amount and a first sheet bundle image, which corresponds to the job identification information, and a second sheet bundle image, which does not correspond to the job identification information, are distinguishably displayed.

An image forming apparatus includes an image forming device; a fixing device; a first conveyance passage downstream from the fixing device in a sheet conveyance direction; a second conveyance passage downstream from the fixing device and communicating with the first conveyance passage; a sheet reversing member to reverse a conveyance direction of the sheet to the second conveyance passage; a divider to switch a route of the sheet between the first conveyance passage and the second conveyance passage; and a sheet detection sensor disposed downstream from the fixing device and upstream from the divider. The first conveyance passage includes a sheet outlet from which the sheet is ejected outside the apparatus. The apparatus further includes a ventilation passage communicating with an outside, to guide air from the outside to pass the sheet detection sensor and enter at least one of the first conveyance passage and the second conveyance passage.

An additive manufacturing system includes a transfer belt traveling along a belt path including first and second moveable-position rollers and a plurality of fixed-position rollers. The belt path includes a fixed-velocity portion from the first moveable position roller to the second moveable position roller, and a variable-velocity portion from the second moveable position roller to the first moveable position roller. An electrophotography engine positioned along the fixed-velocity portion deposits a part material layer onto the transfer belt, and an image transfer assembly positioned along the variable-velocity portion transfers the part material layer onto a receiver medium. An image sensing system positioned along the belt path between the second moveable position roller and the image transfer assembly captures an image which is analyzed to determine an in-track registration error, and the positions of the first and second moveable position rollers are adjusted to compensate for the in-track registration error.

An additive manufacturing system includes a transfer belt traveling along a belt path including first and second moveable-position rollers and a plurality of fixed-position rollers. The belt path includes a fixed-velocity portion from the first moveable position roller to the second moveable position roller, and a variable-velocity portion from the second moveable position roller to the first moveable position roller. An electrophotography engine positioned along the fixed-velocity portion deposits a part material layer onto the transfer belt, and an image transfer assembly positioned along the variable-velocity portion transfers the part material layer onto a receiver medium. An image sensing system positioned along the belt path between the second moveable position roller and the image transfer assembly captures an image which is analyzed to determine an in-track registration error, and the positions of the first and second moveable position rollers are adjusted to compensate for the in-track registration error.

An additive manufacturing system includes a transfer belt traveling along a belt path. An electrophotography engine positioned along belt path deposits a part material layer onto the transfer belt, and an image transfer assembly positioned along the belt path transfers the part material layer onto a build platform. An image sensing system positioned along the belt path between the electrophotography engine and the image transfer assembly captures an image which is analyzed to determine an in-track registration error. An in-track position of the build platform is adjusted to compensate for the in-track registration error.

An image forming apparatus includes an image forming device; a fixing device; a first conveyance passage downstream from the fixing device in a sheet conveyance direction; a second conveyance passage downstream from the fixing device and communicating with the first conveyance passage; a sheet reversing member to reverse a conveyance direction of the sheet to the second conveyance passage; a divider to switch a route of the sheet between the first conveyance passage and the second conveyance passage; and a sheet detection sensor disposed downstream from the fixing device and upstream from the divider. The first conveyance passage includes a sheet outlet from which the sheet is ejected outside the apparatus. The apparatus further includes a ventilation passage communicating with an outside, to guide air from the outside to pass the sheet detection sensor and enter at least one of the first conveyance passage and the second conveyance passage.