US 2004/0170457 A1 · Image forming device regulating sheet conveying timings

Abstract

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

Claims7

Dependent claims

An image forming device for forming an image on a cut image recording medium comprising:

a sheet feeder unit storing therein a stack of image recording mediums, and comprising a separation unit that intermittently separates one sheet of the stack from a remaining stack at a separating position and feeds the one sheet in a sheet feeding direction;
an image forming unit at which a visible image is formed on the image recording medium fed from the sheet feeder;
a conveying path extending between the sheet feeder unit and the image forming unit, each image recording medium being conveyed through the conveying path in the sheet feeding direction from the sheet feeder unit to the image forming unit;
and
a sheet leading edge position regulating unit having a part selectively protrudable, near the separating position, into the sheet conveying path to provide a protruding position and selectively retractable away from the sheet conveying path to provide a retracting position, a leading edge position of the image recording medium being regulated upon protrusion of the part into the sheet conveying path.

2 more elements

Dependencies are inferred from the claim text.

Image forming device regulating sheet conveying timings

Life of this patent

Image forming device regulating sheet conveying timings

Life of this patent

Abstract

Claims7