Patent ID: 8750738
Filing Date: 2014-06-10
Classification: G03G

Abstract:
1. An image forming system, comprising: a first image forming apparatus having: a first image forming portion configured to form an image; a first transfer unit configured to transfer, onto a recording material, the image formed by the first image forming portion; a first transfer power source configured to apply a voltage to the first transfer unit; and a first thermal fixing unit configured to thermally fix the image onto the recording material; a second image forming apparatus having: a second image forming portion configured to form an image; a second transfer unit configured to transfer, onto a recording material, the image formed by the second image forming portion; a second transfer power source configured to apply a voltage to the second transfer unit; and a second thermal fixing unit configured to thermally fix the image onto the recording material; a recording material containing portion configured to contain a recording material to be conveyed to the first transfer unit; a conveying unit configured to convey the recording material from the first image forming apparatus to the second image forming apparatus; a duplex image forming mode executing unit configured to execute: a determining unit configured to determine whether or not the first image forming portion has run out of toner and whether or not the second duplex image forming mode is executable; and a control unit configured to control an absolute value of the voltage of the second transfer power source in a manner that, when the determining unit determines, during a period in which the duplex image forming mode executing unit executes the first duplex image forming mode, that the first image forming portion has run out of toner and that the second duplex image forming mode is executable, and when the duplex image forming mode executing unit changes over the first duplex image forming mode to the second duplex image forming mode to continue duplex image formation, the control unit makes an absolute value of the voltage of the second transfer power source when transferring the image onto the one surface of the recording material larger than an absolute value of the voltage of the first transfer power source in the first duplex image forming mode, and the control unit makes an absolute value of the voltage of the second transfer power source when transferring the image onto the another surface of the recording material larger than an absolute value of the voltage of the second transfer power source in the first duplex image forming mode.