Image forming apparatus capable of adjusting tension of endless belt
AssigneeHewlett-Packard Development Company, L.P.
InventorYasuo Suzuki
Life of this patent
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Abstract
An image forming apparatus includes an endless belt to rotate, belt rollers including a tension roller and an adjustment roller extending inside the endless belt, a nip roller extending adjacent the endless belt to form a nip between the nip roller and the endless belt, and a cam shaft that includes a nip forming cam and a tension adjustment cam. The nip forming cam moves the nip roller between a pressed position in which the nip roller is pressed against the endless belt, and a retracted position in which the nip roller is retracted from the endless belt. The tension adjustment cam moves the adjustment roller relative to the tension roller.
Claims14
An image forming apparatus comprising:
- an endless belt to rotate;
- belt rollers including a tension roller and an adjustment roller extending inside the endless belt;
- a nip roller extending adjacent the endless belt to form a nip between the nip roller and the endless belt;
- and
- a cam shaft that includes:
- a nip forming cam to move the nip roller between a pressed position wherein the nip roller is pressed against the endless belt, and a retracted position wherein the nip roller is retracted from the endless belt;
- and
- a tension adjustment cam to move the adjustment roller relative to the tension roller, wherein the tension adjustment cam includes:
- a first apex to move the adjustment roller toward the tension roller when the nip forming cam positions the nip roller in the pressed position;
- and
- a second apex to move the adjustment roller toward the tension roller when the nip forming cam positions the nip roller in the retracted position.
An image forming apparatus comprising:
- an endless belt to rotate;
- belt rollers including a tension roller and an adjustment roller extending in a longitudinal direction inside the endless belt;
- a nip roller extending adjacent the endless belt to form a nip between the nip roller and the endless belt;
- a nip forming device to move the nip roller between a pressed position wherein the nip roller is pressed against the endless belt, and a retracted position wherein the nip roller is retracted from the endless belt;
- and
- a tension adjustment device to correct a misalignment of the endless belt in the longitudinal direction when the endless belt rotates, the tension adjustment device to tilt the adjustment roller relative to the tension roller when the nip roller is in the pressed position and when the nip roller is in the retracted position, wherein the tension adjustment device includes:
- a first apex to move the adjustment roller toward the tension roller when the nip forming device positions the nip roller in the pressed position;
- and
- a second apex to move the adjustment roller toward the tension roller when the nip forming device positions the nip roller in the retracted position.
Dependencies are inferred from the claim text.