Abstract: A fixing device includes a rotatable fixing roller, an endless fixing belt, a pressing unit having first and second pressing members that press a surface of the fixing belt against the fixing roller, a fixed support member that supports the fixing roller rotatably, a movable support member that supports the first pressing member in a fixed state and supports the second pressing member such as to be movable closer to and away from the fixing roller, a first pressure spring that presses the movable support member closer to the fixing roller, a second pressure spring that presses the second pressing member closer to the fixing roller, and a switch mechanism that switches between a first state in which the first and second pressing members are pressed against the fixing roller and a second state in which only the second pressing member is pressed against the fixing roller.

Abstract: A fixing device includes a heating rotating body that is heated by a heater and rotates, a pressurizing rotating body that is in contact with a surface portion of the heating rotating body and rotates, and that forms a fixing portion, a pressing mechanism that presses the pressurizing rotating body against the heating rotating body and that uses a plurality of springs disposed on both end portions of the pressurizing rotating body in a direction of the second rotation shaft, and a switching mechanism that switches between a first pressing state in which first combination of springs selected from among the plurality of springs are maintained and a second pressing state in which second combination of springs selected from among the plurality of springs except the first combination of the springs are maintained.

Abstract: A fixing device includes: a fixing rotating member; a pressing rotating member pressed to the fixing surface of the fixing rotating member; a displacing mechanism that can displace the pressing rotating member at least at a first setting position that the pressing rotating member pressed to the fixing surface is located in a first position relative to the fixing rotating member and at a second setting position the pressing rotating member pressed to the fixing surface is in a second position shifted from the first position in the downstream or upstream side of a passing direction of the recording medium at the fixing process part; a guide member having a guide part that guides the recording medium to an introducing portion of the fixing process part; an adjusting mechanism that can adjust the position of the guide member in accordance with the displacement of the pressing rotating member to the first setting position or the second setting position.

Abstract: A fixing device has a regulating mechanism for maintaining a contact portion of a pressing member in a state in which the contact portion does not contact with a fixing roll through a fixing belt from a second area to a first area or a state in which a pressure is reduced so that the contact portion contacts with the fixing roll when switching from a state in which the contact portion is placed in the second area to a state in which the contact portion is placed in the first area is carried out by a switching mechanism, and making a transition for the contact portion of the pressing member into a contact state at a predetermined pressure when the first area is reached.

Abstract: A fixing device including a heating member, a pressing member that presses the heating member, a switching unit that switches a press contact force of the pressing member and a container body that accommodates the heating member, the pressing member, and the switching unit, wherein the switching unit, includes a drive member that moves the pressing member in a predetermined direction and an auxiliary drive member that is connected to the drive member and relatively moves with the drive member, and the auxiliary drive member, in a case where the container body is placed in an image forming apparatus including a lid, switches between a operative association state and a nonoperative association state, and the auxiliary drive member including a returning section that returns a tip of the auxiliary drive member to a position crossing a movement trajectory of the lid in the nonoperative association state.

Abstract: A fixing device includes a heating rotating body that is heated by a heater and rotates, a pressurizing rotating body that is in contact with a surface portion of the heating rotating body and rotates, and that forms a fixing portion, a pressing mechanism that presses the pressurizing rotating body against the heating rotating body and that uses a plurality of springs disposed on both end portions of the pressurizing rotating body in a direction of the second rotation shaft, and a switching mechanism that switches between a first pressing state in which first combination of springs selected from among the plurality of springs are maintained and a second pressing state in which second combination of springs selected from among the plurality of springs except the first combination of the springs are maintained.

Abstract: A driven rotary unit for conveying a sheet, includes a shaft member which is rotatably supported by a supporting member, and a cylindrical cylinder member which is attached to an outside of the shaft member, in which an inner diameter of the cylinder member is larger than an outer diameter of the shaft member, and which is disposed to be freely rotatable with respect to the shaft member, wherein the driven rotary unit is rotated by a conveyed sheet.