Abstract: An image forming apparatus includes a plurality of image forming parts that form toner images having colors different from each other, the plurality of image forming parts disposed in series to multiply-transfer the toner images of the colors directly to a recording medium to form a color image; a detecting unit that detects a mark on the recording medium formed by the plurality of image forming parts; a print controlling part that controls image forming positions of the plurality of image forming parts based on a detection result of the mark by the detecting unit; and a mark removing unit that removes the mark formed on the recording medium before fixing.

Abstract: An image forming apparatus includes a plurality of image forming parts that form toner images having colors different from each other, the plurality of image forming parts disposed in series to multiply-transfer the toner images of the colors directly to a recording medium to form a color image; a detecting unit that detects a mark on the recording medium formed by the plurality of image forming parts; a print controlling part that controls image forming positions of the plurality of image forming parts based on a detection result of the mark by the detecting unit; and a mark removing unit that removes the mark formed on the recording medium before fixing.

Abstract: A continuous feed printer prints images on a continuous paper sheet with conveyance holes perforated at regular intervals along the edges thereof and conveyed by a pinless transportation mechanism. The continuous feed printer includes: a conveyance hole detecting device that detects the conveyance holes on the sheet; a comparison device that compares a measured conveyance length of the sheet, which is a length of the sheet conveyed from the time when the conveyance hole detection has been started to the time when a predetermined number of conveyance holes has been detected, with a calculated conveyance length that is calculated from a number of the detected conveyance holes and the intervals between the conveyance holes; and an adjusting device that adjusts a conveyance velocity of the sheet based on the result of comparison of the measured conveyance length with the calculated conveyance length to make them equal to each other.

Abstract: An apparatus for feeding a printing sheet in a printer, comprising a platen for supporting and feeding a printing sheet to be printed, a plurality of printing heads used for printing, in turn, colors of yellow (Y), magenta (M), cyan (C), and black (B), and arranged along the periphery of the platen, and a motor for rotating the platen via a speed reduction gear train, so that the plurality of printing heads, in turn, print the printing sheet while the printing sheet is moved by the platen. A distance between the printing heads in the sheet feeding direction is equal to a distance for which the printing sheet is moved while as second gear engaged with a first gear directly mounted on the platen is rotated by an integral number of revolutions.