An image forming system, includes: an image former that performs image formation on a transfer medium; and a controller that acquires a detection result of detecting the transfer medium by a detector with respect to a length of the transfer medium, wherein the controller sets an image forming condition for the transfer medium on the basis of the length of the transfer medium obtained from the detection result.

An image forming system may comprise a first image forming apparatus arranged on a conveyance path of a recording medium, a second image forming apparatus arranged on the conveyance path at a position farther downstream than the first image forming apparatus in a conveyance direction of the recording medium, a first reading section arranged on the conveyance path between the first image forming apparatus and the second image forming apparatus, and reads the recording medium conveyed through the conveyance path, and a second reading section arranged on the conveyance path at a position farther downstream than the second image forming apparatus in the conveyance direction, and reads the recording medium conveyed through the conveyance path.

The digital printing process includes the printing of liquid toner on both substrate sides. Thereto developed portions of a first and a second liquid toner are transferred to the first side and fused by exposure to infrared radiation and by subsequent contact fusing. The substrate is conditioned for a further transfer step by maintaining a substantially uniform water content therein during and after the fusing step, in which further transfer step at least one further developed portion of liquid toner is transferred to a side of the substrate. This occurs particularly by limiting heat development in the liquid toner, such as by using a black toner liquid with an absorbance at 800 nm of at most than 0.8.

A transfer roller is arranged at the inside of a first intermediate transfer belt. The transfer roller faces the first transfer position. A transfer bias voltage having a charged polarity opposite to that of the first toner is applied to the transfer roller. The transfer roller transfers a first toner image to a first surface of a sheet. The transfer roller further transfers a second toner image to a second surface at the opposite side to the first surface on the sheet. A fixing device heats and fixes the first toner image and the second toner image that are transferred to the sheet on a sheet simultaneously.

In an image forming apparatus of a tandem type including an intermediate conveying apparatus which conveys a sheet conveyed from a first image forming apparatus to a second image forming apparatus using a sheet conveying member, there are provided with a detecting portion configured to detect a state of the sheet conveying member, and an adjusting portion configured to adjust the state of the sheet conveying member so that the amount of heat radiation from the sheet in the sheet conveying member becomes constant, according to a detection result of the detecting portion.

Provided is an image formation system of series tandem type in which first and second image formation apparatuses connected in series execute an image formation process on a recording material, wherein the first image formation apparatus includes: a first image carrier; a first toner image formation unit; a first density detection unit; a first density control value setting unit; and a first temperature detection unit, the second image formation apparatus includes: a second image carrier; a second toner image formation unit; a second density detection unit; a second density control value setting unit; and a second temperature detection unit, and the image formation system includes: a recording material density detection unit; and a control unit.

A digital printing system is disclosed having two independently operable printing towers arranged in series such that a substrate sheet passes sequentially through both printing towers, and in which a perfecting mechanism is provided between the two towers to reverse each substrate sheet during transfer from the first printing tower to the second printing tower, the perfecting mechanism being selectively operable to enable the second tower to print either on the same side of each substrate sheet as the first tower or on the opposite side of each substrate sheet. As well as allowing a duplex mode, the system provides a higher speed simplex mode during which different separations of the same image are printed by the two towers.