An image forming device includes: an endless intermediate transfer belt; and a secondary transferrer, wherein the secondary transferrer includes a secondary transfer roller and a counter roller, a value calculated from w/V.sub.sys is defined as a nip time N [sec], when the secondary transferrer is deemed as an equivalent circuit including a resistance R1 [.Math.m.sup.2] of the secondary transfer roller, a resistance R2 [.Math.m.sup.2] of the intermediate transfer belt, a resistance R3 [.Math.m.sup.2] of the counter roller, and capacitance C.sub.med [F/m.sup.2] of a recording medium, in a case where a combined resistance in the equivalent circuit is defined as R.sub.total [.Math.m.sup.2], and combined capacitance in the equivalent circuit is defined as C.sub.total [F/m.sup.2], a value calculated from R.sub.totalC.sub.total is defined as a time constant [sec], and the image forming device further includes: a sheet detector; and a hardware processor.

An image forming apparatus includes: an image forming unit configured to form an image on a continuous transfer medium on the basis of image data of a job; and a controller configured to manage the job and control the image forming unit, wherein the controller has a function of adjusting an image print position on the continuous transfer medium when a job medium width size specified in the job is different from a fed medium width size used in printing.

A web handling system is disclosed. The web handling system includes first dancer rollers coupled to engage and move a web of a print medium in a forward and backward direction upon stopping a printing operation and allow forward motion during the printing operation.

A belt device includes a belt, a driving roller, and driven roller. The belt is endless and includes a flat outer peripheral surface, an inner peripheral surface, and a mark part provided on the outer peripheral surface and depressed toward the inner peripheral surface. The mark part has grooves extending in the first direction. Two or more of the grooves each include a middle portion away from a border between the outer peripheral surface and the corresponding groove, and an edge portion coupling the middle portion to the border, and each have a middle-portion depth, a depth of the middle portion from the outer peripheral surface, greater than an edge-portion depth, a depth of the edge portion from the outer peripheral surface, and each have a deepest portion at a position away from the border by 0.2 millimeters or more from the border toward the middle portion.

Provided is an image forming apparatus for forming images of a plurality of pages on continuous paper according to image data of the images. The image forming apparatus includes: a coverage calculating section that calculates a moving average coverage over a predetermined print length using the image data before starting a print job; and an operation control section that controls an image forming operation related to toner usage according to a result of comparison between the moving average coverage and one or both of a predetermined maximum threshold and a predetermined minimum threshold.

An image forming device includes: a conveyer that conveys a recording medium; an image former that forms an image on an image carrier and prints the image on the recording medium conveyed by the conveyer; and a hardware processor that controls to stop a print job when a length of the print job reaches a predetermined threshold and form a cleaning pattern image on the image carrier, and at the time of overprinting to further print in an overlapping manner on continuous paper on which a mark image indicating an image formation position is printed, obtains the length of the print job on the basis of an interval between mark images set in advance before starting printing the print job and displays a warning when the length of the print job is estimated to exceed the predetermined threshold.

An image forming apparatus includes an image carrier, a transfer member that transfers an image on the image carrier to a continuous medium, a fixing device that fixes the image transferred to the medium, and a transport member that is disposed downstream of the fixing device in a transport direction of the medium and that transports the medium. When the transport member transports the medium, the fixing device is passively rotated in accordance with movement of the medium.

A web handling system is disclosed. The web handling system includes first dancer rollers coupled to engage and move a web of a print medium in a forward and backward direction upon stopping a printing operation and allow forward motion during the printing operation.

An image inspection apparatus includes: an image area signal generator that refers to information from an image forming apparatus to set lengths of turning on and off of a sub-scanning image area signal that determines turning on and off of reading, and generates the sub-scanning image area signal to indicate a start of image formation; a reader that reads an image; an inspector that compares a read image generated through reading with an expected-value image; and a controller that controls the image area signal generator, the reader, and the inspector, wherein, when a deviation equal to or greater than a predetermined threshold value is detected at positions of sub-scanning on corresponding images during the comparison, the controller adjusts an OFF period of the sub-scanning image area signal to eliminate a positional deviation of sub-scanning on the corresponding images between the read image and the expected-value image.

An image formation apparatus according to an embodiment may include: a cutting unit including a cutting member, a polarity of the cutting member being opposite to a polarity of the medium in a triboelectric series; an image formation unit that forms an image on the medium cut by the cutting unit; and a pressure contact unit arranged between the cutting unit and the image formation unit, and including a first pressure contact member and a second pressure contact member that are put in pressure contact with each other across the medium cut by the cutting unit, a polarity of the first pressure contact member being opposite to the polarity of the medium in a triboelectric series, a polarity value of the second pressure contact member shifted from a polarity value of the first pressure contact member toward the polarity of the medium in the triboelectric series.