An image forming apparatus includes: an image former that has an image carrier for supporting toner and prints a first image formed by exposure to the image carrier and a developing processing on continuous paper; and a hardware processor that controls the image former so as to print a second image on the continuous paper in a case where information on at least one of coverage and a printing distance of the first image formed by the image former meets a predetermined condition, wherein the hardware processor controls the image former so as to stop forming the second image on the image carrier before a toner amount of the second image per unit width at a predetermined position on the image carrier in a main scanning direction exceeds a threshold value affecting an exposure memory.

A duplex printing system and method of configuring the same are described. In examples, an image, such as a test pattern, on one side of a print substrate is printed to be out of phase with an image, such as a test pattern, on the other side of the print substrate. This is achieved by adjusting a configuration of a print buffer that is located between first and second print engines of the duplex printing system. In particular examples, a length of a web within the print buffer is controlled such that the images are out of phase.

An electrification adjustment apparatus includes a first electrification adjuster facing the recording material conveyed for supplying charges each with one polarity, and a second electrification adjuster facing the recording material downstream of the first electrification adjuster in a conveying direction for supplying charges each with opposite polarity to that of the charge supplied by the first electrification adjuster. In the electrification adjustment apparatus, an electrostatic capacity between the recording material surface facing the second electrification adjuster, and an electrode partially or entirely formed from the conveyor member is smaller than the one between the recording material surface facing the first electrification adjuster and an electrode partially or entirely formed from the conveyor member. Either front or back surface of the recording material is in contact with the conveyor member in a region between the first and the second electrification adjusters.

A medium feed unit in an image forming apparatus having an image forming unit and feeds a medium to the image forming unit, includes a medium introductory part that includes a first shaft and a medium feed part that includes a second shaft feeds the medium to the medium introductory part; a fixation part that includes a first holding part holding the first shaft and a second holding part holding the second shaft; and a link member that links the first shaft with the second shaft and is displaceable with respect to the fixation part. A first inclination angle of the first shaft with respect to the fixation part varies in accordance with a variation of a second inclination angle of the second shaft with respect to the fixation part.

A print medium feeding device includes a guide unit; a first conveyance unit that applies first conveyance force F1 to the print medium, a first part of the first conveyance force applying section moving at a first linear velocity V1; a second conveyance unit including a second conveyance force applying section that makes contact with the print medium and applies second conveyance force F2 to the print medium, a second part of the second conveyance force applying section moving at a second linear velocity V2; and a third conveyance unit including a third conveyance force applying section that makes contact with the print medium and applies third conveyance force F3 to the print medium, a third part of the third conveyance force applying section moving at a third linear velocity V3, wherein V2>V3>V1 and F3>F1>F2 are satisfied.

An image forming apparatus carrying a medium along a carrying path in a medium carrying direction includes a cutting part cutting the medium carried along the carrying path, a carrying part carrying and ejecting the medium cut by the cutting part, being located at downstream side from the cutting part, a medium jam detection part detecting a jamming of the medium by the carrying part, a remaining medium detection part detecting whether the medium remains in the carrying part, a recovery process selection part that selects a recovery process according to a remaining state of the medium, which is determined by the remaining medium detection part, and a controller that, when the medium jam detection part has detected the jamming of the medium, ejects the remaining medium based on the recovery process selected by the recovery process selection part.

An image forming apparatus includes a communication unit to acquire image forming data, generation units and to generate image data based on the image forming data, a correction unit to change an amount of correction to correct a shift of an image of the image data in forming the image in accordance with a ratio at which a developer is deposited by using the image data, and a printing unit to form the image corrected by the correction unit on a medium.

An image forming apparatus is provided, including a conveying member configured to convey a long paper along a paper path; an image forming unit which forms an image on the long paper being conveyed by the conveying member along the paper path; an image reading unit which reads a surface of the long paper, the surface having the image formed by the image forming unit; and a color sample member which is arrangeable at a position facing the image reading unit, such that the long paper is conveyed by the conveying member to avoid passing through between the image reading unit and the color sample member. Also included is a switch between a first arrangement in which the image reading unit reads the long paper and a second arrangement in which the image reading unit faces the long paper via the color sample member and reads the color sample member, the switch being made by moving the image reading unit or by moving the color sample member and the conveying member.

A conveyance device includes: a holder to hold a paper roll and rotate along with rotation of the paper roll; a conveyor to convey a sheet located at an entry of a sheet conveyance path; a motor to apply a conveyance force to the conveyor; a first power supply circuit to output power both in a sleep mode and a ready mode; a second power supply circuit to output power in the ready mode but not in the sleep mode; a signal output unit supplied with the power from the first power supply circuit and to output a rotation detection signal when the holder rotates in the sleep mode or the ready mode; and a controller to, when the rotation detection signal is received in the sleep mode, turn on the second power supply circuit to supply the power to at least the motor to convey the sheet.

An image forming apparatus includes an image former, an informing unit, and a hardware processor. The image former prints an image on continuous paper by: forming an electrostatic latent image on an image holder based on image information of a job; developing the electrostatic latent image with toner, thereby forming a toner image on the image holder; and transferring the toner image onto the continuous paper. Based on the image information of the job, the hardware processor calculates a coverage of the image to be printed on the continuous paper. Based on the calculated coverage, the hardware processor determines a continuously printable distance on the continuous paper. The hardware processor causes the informing unit to inform a user of the continuously printable distance before the image former starts the printing.