FUSING DEVICE AND IMAGE FORMING APPARATUS

摘要

A fusing device includes a first roller, a second roller forming a fusing nip part together with the first roller, an adjustment mechanism changing posture of the first roller between first and second postures, a separation member, a turning mechanism, an abutting member, and an isolation mechanism. The turning mechanism turns the separation member so that the separation member approaches the first roller when the posture of the first roller is changed from the second posture to the first posture. The abutting member abuts on the first roller to form a gap between the separation member and the first roller when the first roller is in the first posture. The isolation mechanism separates the abutting member from the first roller in a process when posture of the first roller is changed from the first posture to the second posture.

主权项

1. A fusing device, comprising:
a first roller configured to rotate about its axis; a second roller configured to rotate about its axis and to form a fusing nip part together with the first roller; an adjustment mechanism configured to change posture of the first roller or the second roller between first posture and second posture to adjust a nip pressure of the fusing nip part, the adjusting mechanism setting the first or second roller in the first posture to allow the first or second roller to be in press contact with the second or first roller by a first pressure, and setting the first or second roller in the second posture to allow the first or second roller to be in press contact with the second or first roller by a second pressure which is reduced from the first pressure; a separation member arranged downstream of the fusing nip part in a direction of rotation of the first roller and including a plate-shaped member extending in an axial direction of the first roller; a turning mechanism configured to turn the separation member about an axis parallel to the axial direction of the first roller, the turning mechanism turning the separation member so that a tip end of the plate-shaped member approaches a peripheral surface of the first roller when the posture of the first or second roller is changed from the second posture to the first posture; an abutting member mounted on each opposite end of the plate-shaped member of the separation member and configured to abut, when the first or second roller is in the first posture, on the peripheral surface of the first roller in a vicinity of each opposite end of the first roller to form a gap between the tip end of the plate-shaped member and the peripheral surface of the first roller; and an isolation mechanism configured to allow the abutting member to abut on the peripheral surface of the first roller when the first or second roller is in the first posture and to separate the abutting member from the peripheral surface of the first roller in a process when the posture of the first or second roller is changed from the first posture to the second posture.