Image forming system including a first transfer unit and a second transfer unit having a total resistance larger than that of the first transfer unit

An image forming system comprising:

• a first image forming apparatus comprising:
• a first image forming means for forming a first image of at least one color, and
• a first transfer means for transferring the first image formed by the first image forming unit to a recording medium;
• and
• a second image forming apparatus comprising:
• a second image forming means for forming a second image having at least one color that is different from any color of the first image, and
• a second transfer means for transferring the second image formed by the second image forming means to the recording medium on which the first image has been formed by the first image forming apparatus,
• wherein a total resistance of the second transfer means along a direction in which a transfer current flows is larger than that of the first transfer means,
• wherein a transfer power supply of the first transfer means is constant-current-controlled, and
• wherein a transfer power supply of the second transfer means is constant-voltage-controlled.

An image forming system comprising:

• a first image forming apparatus comprising:
• a first image forming device comprising:
• a first photoconductor drum;
• a first developer;
• a first exposure device;
• and
• a first charger configured to charge a peripheral surface of the first photoconductor drum,
• wherein the first image forming device is configured to form a first image of at least one color, and
• a first transfer device comprising a first transfer belt,
• wherein the first transfer device is configured to transfer the first image formed by the first image forming device to a recording medium;
• and
• a second image forming apparatus comprising:
• a second image forming device comprising:
• a second photoconductor drum;
• a second developer;
• a second exposure device;
• and
• a second charger configured to charge a peripheral surface of the second photoconductor drum,
• wherein the second image forming device is configured to form a second image having at least one color that is different from any color of the first image, and
• a second transfer device comprising a second transfer belt,
• wherein the second transfer device is configured to transfer the second image formed by the second image forming device to the recording medium on which the first image has been formed by the first image forming apparatus,
• wherein a total resistance of the second transfer device along a direction in which a transfer current flows is larger than that of the first transfer device,
• wherein a transfer power supply of the first transfer device is constant-current-controlled, and
• wherein a transfer power supply of the second transfer device is constant-voltage-controlled.