Patent ID: 8256868

Claim:
An image forming device in which a feed paper carriage unit, a plurality of image forming units, and a discharge paper carriage unit are detachably connected to each other in a way from an upstream side to a downstream side in a transport direction of a recording medium, comprising: a signal line that is connected, in serial, from the feed paper carriage unit to the discharge paper carriage unit via the plurality of image forming units, wherein the feed paper carriage unit comprises an interface unit and a control unit that controls to transmit an initial location confirmation signal by using the interface unit, to an image forming unit located next to the feed paper carriage unit, each of the image forming unit comprises a storage part that stores therein a location confirmation signal of the own image forming unit, an interface part that transmits the stored location confirmation signal, and a control part that when the control part of the image forming unit receives the initial location confirmation signal via the signal line, the control part recognizes that the own image forming unit is a first unit, generates and stores a first location confirmation signal in the storage part, and controls to transmit the first location confirmation signal by using the interface part to an image forming unit located next to the own image forming unit, when the control part of the image forming unit receives the first location confirmation signal via the signal line, the control part recognizes that the own image forming unit is a second unit, generates and stores a second location confirmation signal in the storage part, and controls to transmit the second location confirmation signal by using the interface part to the image forming unit located next to the own image forming unit, and when the control part of the image forming unit receives an (n−1)-th location confirmation signal via the signal line, the control part generates and stores an n-th location confirmation signal in the storage part, recognizes that the own image forming unit, is an n-th unit, and controls to transmit the n-th location confirmation signal by using the interface part to the discharge paper carriage unit.