An image forming apparatus includes a sheet conveyance device; an image forming device including a sheet conveyance roller and a pressure roller; a memory; and a controller. The memory stores profile data indicating variation in conveyance amount in a circumferential direction due to eccentricity of the conveyance roller. The controller calculates, in intermittent conveyance processing, a correction value based on corresponding profile data for each of positions included in a width of an image to be formed in next image forming processing, the correction value being a difference between a predetermined conveyance amount and an actual conveyance amount; corrects a reference amount of rotation by a representative value of calculated correction values to calculate a corrected amount of rotation, the reference amount being an ideal amount of rotation of the conveyance roller that conveys a sheet by the predetermined conveyance amount; and rotates the conveyance roller by the corrected amount.

An apparatus for splicing comprises a first web support surface configured to support a traveling web thereon and a second web support surface configured to support a replacement web thereon. The first traveling web travels in a machine direction. The splicing assembly also comprises a first web sensor and a web joiner. A controller is configured to determine, via the first web sensor, a position of a trailing end of the traveling web and to, in response to determining the position of the trailing end, cause a leading end of the replacement web to be positioned adjacently to the trailing end. The computer is also configured to control the web joiner to create a joint coupling the trailing end to the leading end.

A device for introducing patterns by radiating a wound continuous substrate. The device provides patterning during continuous roll-to-roll movement without material slippage and with minimal distortion by providing a dancer roll between a processing drum and an unwinder roll on one side, and a winder roll on the other side, for tautly guiding the continuous substrate along a contact surface of at least half of the circumference of the processing drum in order to drive the continuous substrate without slippage. The dancer rolls are adapted to tautly guide the advancing substrate web and returning substrate web with a constant force, and an equilibrium is adjustable between a defined counterforce and the constant action of force on the dancer roll by a stabilization device, and is maintained constant by a controller based on measured deflections of the dancer roll by controlling the rotational speed of the unwinder and winder rolls.

An image forming apparatus, comprises: a setting unit configured to set a divider region in a group of images that are continuously printed during feeding from a feeding apparatus in which a roll-shaped printing medium has been set, the divider region being for separating the roll-shaped printing medium into a plurality of rolls. The setting unit sets the divider region based on the number of rolls indicating the count of the plurality of rolls, the number of rolls being required in terms of a configuration of a post-processing device that executes post-processing with respect to the roll-shaped printing medium on which printing has been performed by the printing unit.

A method (400) for producing packages (112) holding liquid food products from a web (102) of packaging material, wherein the web (102) comprises a number of blanks (300) placed after one another, wherein each blank corresponds to one package, the method comprising receiving (402) a reel (204) holding the web (102) of packaging material, capturing (402) reel data (210) from a tag (206) attached to the reel (204), transferring (404) the reel data (210) to a printing information database (218), receiving (406) printing information data (PID) (220) related to the reel data (210) from the printing information database (218), printing (408) décors on each of the blanks (300) of the web (102) of packaging material based on information provided via the PID (220) such that a décor provided web (246) is formed, transferring (410) the reel data (210) to a packaging machine information database (224), receiving (412) packaging machine information data (PMID) (226) related to the reel data (210) from the packaging machine information database (224), and forming (414) the packages (112) from the decor provided web (246) in a packaging machine (100) based on information provided via the PMID (226).

According to an example, a media loading device may comprise a motor and a leading-edge sensor. The motor may rotate a media roll having a leading-edge in a winding direction and unwinding direction, the motor being controlled by a processor. The leading-edge sensor may comprise a pivot arm and a detecting element. The pivot arm may contact the media roll and the detecting element may issue a leading-edge presence signal to the processor upon contact between the detecting element and the leading-edge occurs.

Feeding unit for feeding a plastic film in packaging machines, including: a unit for unwinding the film from a reel; a cutting device downstream of the unwinding unit and intended to form sheets of predetermined length; a transfer device downstream of the cutting device; a positioning device downstream of the transfer device and comprising drive belts able to engage the upper and the lower faces of the film. The belts of the positioning device are controlled by a control unit connected with optical elements that detect the passage of signs formed on the film. The control unit is programmed to compare a transit time elapsing during the passage of the signs of a same side of two consecutive sheets with a cycle time and to increase or decrease the speed of said belts if the transit time is less than or greater than the cycle time.

A method (400) for producing packages (112) holding liquid food products from a web (102) of packaging material, wherein the web (102) comprises a number of blanks (300) placed after one another, wherein each blank corresponds to one package, the method comprising receiving (402) a reel (204) holding the web (102) of packaging material, capturing (402) reel data (210) from a tag (206) attached to the reel (204), transferring (404) the reel data (210) to a printing information database (218), receiving (406) printing information data (PID) (220) related to the reel data (210) from the printing information database (218), printing (408) décors on each of the blanks (300) of the web (102) of packaging material based on information provided via the PID (220) such that a décor provided web (246) is formed, transferring (410) the reel data (210) to a packaging machine information database (224), receiving (412) packaging machine information data (PMID) (226) related to the reel data (210) from the packaging machine information database (224), and forming (414) the packages (112) from the decor provided web (246) in a packaging machine (100) based on information provided via the PMID (226).

A sheet conveyor includes: a holder that detachably holds a sheet roll; a rotation measuring device that measures a rotation amount of the sheet roll; a conveyance roller that conveys a sheet pulled out from the sheet roll held by the holder; a tensioner that is provided between the holder and the conveyance roller and that contacts with the sheet pulled out from the sheet roll toward the conveyance roller; a position detector that detects a position of the tensioner; a motor that generates driving force for rotating the conveyance roller; and a controller that controls the motor. The controller estimates a diameter of the sheet roll based on a conveyance amount of the sheet caused by rotation of the conveyance roller, a rotation amount of the sheet roll measured by the rotation measuring device, and a position of the tensioner detected by the position detector.

Example implementations relate to determining a correction factor that converts a measured sensor distance to a calibrated sensor distance. The measured sensor distance may be based on an amount of substrate advancement through a web printing press between detecting a mark on the substrate at a first sensor and detecting the mark at a second sensor. The calibrated sensor distance may be the separation between the first sensor and the second sensor.