Image forming device regulating sheet conveying timings

摘要

An image forming device having a sheet conveying path extending from a feeder unit to an image forming unit. A convey roller positioned downstream of the sheet supply roller is rotated at a peripheral speed V3. Additional convey roller positioned downstream of the first convey roller is rotated at a peripheral speed V2 lower than V3. A register roller positioned downstream of the second convey roller is rotated at a peripheral speed V1 lower than V2. A transfer roller of the image forming unit is rotated at a peripheral speed V0 lower than V1. Each convey roller, the register roller, the sheet supply roller is connected to each clutch. Sheet sensors are provided between neighboring rollers for detecting a leading edge of the sheet. Upon detection of the leading edge, the roller positioned immediately upstream of the one of the sensors is shifted to its non-driving state.