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US 5,517,292 AGranted
Fusing apparatus having a paper separating unit
AssigneeOki Electric Industry Co., Ltd.
InventorsHiroyuki Yajima, Takashi Itaya
Life of this patent
Estimating the term…
Abstract
A fusing apparatus 14 for fusing toner onto paper includes a heater roller 2 and a separating unit 15 with a separation claw 16. The separation claw 16 is provided with a paper guide member 17 having a curvature in a direction opposite to the curvature from a point a to a point c on the heater roller 2. After fusing, the front end 10a of the separated paper 10 is guided by the paper guide member 17. The paper guide member 17 reforms a curl imparted by the heating roller 2 curl into the original state, even if the paper 10 sticks to the heater roller 2 until the point c.
Claims19
A fusing apparatus, comprising:
- a heater roller having a fusing portion for thermally fusing toner to a first recording medium which is fed to the heater roller, the fusing portion having a predetermined curvature;
- and
- a separating unit which includes
- a separation claw having a front end portion and a rear end portion, the front end portion being pressed to the heater roller to strip the first recording medium from the heater roller, the separation claw additionally having a guide member for guiding the first recording medium after it has been stripped from the heater roller, the guide member having a curvature in a direction opposite to the curvature of the fusing portion of the heater roller, and
- a rotatable member for engaging a second recording medium if such a second recording medium is fed along with the first recording medium, such a second recording medium having a front end and advancing in a direction toward the rear end portion of the separation claw, the rotatable member being mounted on the separation claw and protruding slightly from the guide member to evade an impact force from the front end of such a second recording medium.
2 more elements
A fusing apparatus, comprising:
- a heater roller having a fusing portion for thermally fusing toner to a recording medium which is fed to the heater roller, the recording medium having a front end;
- and
- a separating unit which includes
- a separation claw which is supported at a pivot axis and which has a front end portion that is pressed to the heater roller in the vicinity of the fusing portion to strip the recording medium from the heater roller before a curl induced by the heater roller is preserved on the recording medium,
- a shaft mounted on the separation claw near the front end portion thereof, the shaft having an axis which is parallel to the pivot axis and which is closer than the pivot axis to the front end portion, and
- a rotatable member, which is mounted on the shaft and which has a portion that protrudes slightly from the separation claw, for evading an impact force from the front end of the recording medium.
3 more elements
A fusing apparatus, comprising:
- a heater roller having a fusing portion for thermally fusing toner to a recording medium which is fed to the heater roller, the recording medium having a front end;
- and
- a separating unit which includes
- a separation claw having a rear end portion and having a front end portion which is pressed to the heater roller in the vicinity of the fusing portion to strip the recording medium from the heater roller before a curl induced by the heater roller is preserved on the recording medium,
- a movable member which is mounted on the separation claw near the front end portion and which protrudes slightly past the separation claw for evading an impact force from the front end of the recording medium, and
- another movable member mounted on the separation claw near the read end portion.
3 more elements
A fusing apparatus, comprising:
- a heater roller;
- and
- a separating unit which includes
- a separation claw having a front end portion,
- mounting means for mounting the separation claw so that it is pivotable about a pivot axis and so that its front end portion is biased against the heater roller, and
- a freely rotatable roller mounted on the separation claw at a position which is closer than the pivot axis to the front end portion.
3 more elements
A fusing apparatus comprising:
- a plurality of rollers, the plurality of rollers including a heater roller and an impact-evasion roller, the heater roller having a fusing portion for thermally fusing toner to a first recording medium which is fed to the heater roller, the fusing portion having a predetermined curvature;
- and
- a separation claw having a front end portion and a rear end portion, the front end portion being pressed to the heater roller to strip the first recording medium from the heater roller, the separation claw additionally having a guide member for guiding the first recording medium after it has been stripped from the heater roller, the guide member having a curvature in a direction opposite to the curvature of the fusing portion of the heater roller;
- wherein the impact-evasion roller is a freely rotatable roller which is mounted on the separation claw at a position to engage a second recording medium if such a second recording medium is fed along with the first recording medium, such a second recording medium having a front end and advancing in a direction toward the rear end portion of the separation claw, the impact-evasion roller protruding slightly from the guide member to evade an impact force from the front end of such a second recording medium;
- and
- wherein the first recording medium has a predetermined thickness, and the impact-evasion roller is spaced apart from every other roller in the fusing apparatus by a distance that is substantially greater than the thickness of the first recording medium.
3 more elements
Dependencies are inferred from the claim text.