Patent ID: 9298142
Filing Date: 2016-03-29
CPC Classification: G03G

Claim Text:
1. An image forming apparatus, comprising: a fixing part including a first heat generating member and a second heat generating member which generate heat by power supplied from a commercial power supply through a power supply path to heat-fix an image formed on a recording material to the recording material; a first relay having one of a make contact and a break contact and a second relay having a transfer contact, the first and second relays configured to switch the first heat generating member and the second heat generating member in between a parallel connection state and a serial connection state; and a power supply voltage detection part for detecting a voltage of the commercial power supply, wherein the serial connection state in which the first relay is in a power supply path cut-off state is set in a case where the power supply voltage detection part detects a 200 V system, and the parallel connection state in which the first relay is in a power supply path connecting state is set in a case where the power supply voltage detection part detects a 100 V system, wherein the image forming apparatus further comprises: a CPU into which a signal from the power supply voltage detection part is input, for outputting a relay driving signal to drive the first, the second or the first and the second relays according to a detection voltage of the power supply voltage detection part; and a relay control part for driving the first and second relays, and into which a signal from the power supply voltage detection part and the relay driving signal from the CPU are input, the relay control part having a latch portion that latches the first relay, wherein in a case where a voltage signal relating to a 200V system is input to the relay control part from the power supply voltage detection part at least one time, the latch portion is latched to keep the first relay in the power supply path cut-off state, and afterward the first relay is kept in the power supply path cut-off state by the latch portion even if the relay driving signal to make the first relay be in the power supply path connecting state is output from the CPU to the relay control part, or even if a voltage signal relating to a 100V system is output from the power supply voltage detection part to the relay control part.