摘要:
A fixing device includes a heat source, a fixing roller, a pressure roller, an elastic layer, a pressing portion, a restricting portion and a driving unit. The fixing roller is heated by the heat source. The pressure roller is held in contact with the fixing roller and forms a fixing nip portion through which a sheet is to be passed. The elastic layer is formed on an inner layer of the fixing roller. The pressing portion presses one roller of the fixing roller and the pressure roller against the other roller while compressing the elastic layer. The restricting portion restricts a compression amount of the elastic layer lest the compression amount should exceed a preset compression amount when the pressing portion presses the roller. The driving unit drives and rotates one of the fixing roller and the pressure roller in a state where the compression amount is restricted.
摘要:
According to an embodiments, provided is a fixing device that includes: an endless fixing belt, heats and melts a toner image, and has flexibility; a stationary member that is set stationary on an inner peripheral surface side of the fixing belt and comes into contact under pressure to form a nip portion; and a reinforcement member that is set stationary on the inner peripheral surface side of the fixing belt and comes into abutment with the stationary member. If it is assumed that a length of the nip portion in a direction of conveyance of the recording medium is designated as A; and a length between an upstream-side abutment portion and a downstream-side abutment portion at which the stationary member and the reinforcement member come into abutment with each other is designated as B, following relation is established: A
摘要:
A belt feeding apparatus includes a rotatable belt member; first and second stretching members for stretching the belt member; and steering means for steering the belt member, the steering means supports the belt member at a position adjacent to the first stretching member and to the second stretching member with respect to a rotational direction of the belt member, wherein the steering means includes rotatable portion rotatable with rotation of the belt member, a frictional portion, provided at each of opposite axial end of the rotation portion, for slidable contact with the belt member, supporting means for supporting the rotatable portion and the frictional portion, and a rotation shaft rotatably supporting the supporting means, wherein the steering means moves the belt member in the rotational axis direction by the supporting means rotating by a force produced by sliding between the belt member and the frictional portion; wherein the frictional portion is disposed substantially at a position where a plane parallel with a plane perpendicular to the rotational axis and a circumference of an ellipse formed when a sum of a distance between the first stretching member and the frictional portion and a distance between the second stretching member and the frictional portion, and wherein a steering force applied to the frictional portion is larger than a resisting force produced upon production of a steering amount per unit length, at a side toward which belt member is deviated when the belt member deviates in the rotational axis direction by the unit length.
摘要:
A fixing device includes a heating body, a pressurizing body, a separation claw, and a supporting member. The heating body heats a medium where a toner image is formed while the heating body rotates around a shaft. The pressurizing body forms a nip with the heating body and applies pressure to the medium that passes through the nip while the pressurizing body rotates around a shaft. The separation claw includes a protrusion that contacts the medium after having passed through the nip and separates the medium from the heating body. The supporting member supports the separation claw in state of causing the separation claw into contact with the heating body. The supporting member supports the separation claw while the supporting member causes the separation claw to slide in a direction separating from the heating body when the medium is brought into contact with the protrusion to press the protrusion.
摘要:
An image forming apparatus includes a main body and a fixing unit. The fixing unit is attachable to and detachable from the main body. The fixing unit includes a heating roller, a pressure roller, and a pressing member. The pressing member presses the pressure roller against the heating roller. The main body includes a cam and a slope member. The cam changes a pressing state of the pressing member. The slope member guides a lower end of the pressing member to a topmost part of the cam in attachment of the fixing unit to the main body.
摘要:
A fixing device includes a cylindrical rotatable heating member; a nip-forming member having a first surface and a second surface opposite from the first surface and contacting an inner surface of the rotatable heating member at the first surface; a supporting member having a supporting surface, contacting the second surface, for supporting the nip-forming member; and a pressing member for forming a nip in cooperation with the nip-forming member though the rotatable heating member. A recording material on which an image is formed is heated at the nip while being feed through the nip, and the image is fixed on the recording material. The supporting surface of the supporting member supports the second surface of the nip-forming member so that the nip-forming member is swingable relative to the supporting member about an axis substantially parallel with a rotational axis of the cylindrical rotatable heating member.
摘要:
An image fixing device includes an elastic roller; a back-up unit forming a fixing nip with the roller therebetween, the back-up unit including a cylindrical film, a film guide, extending inside the film, for guiding the film, and an end portion guiding member including a guiding portion for guiding an inner surface of an end portion of the film. The film guide includes plural ribs contacting the film and arranged in a generatrix direction at positions upstream of the fixing nip with respect to a feeding direction of a sheet. The ribs have free end portions retracted more toward a downstream side with respect to the feeding direction of the recording material than the guiding portion of the end portion guiding member. An inside rib has a free end portion which is retracted more toward the downstream side than free end portions of the opposite end ribs.
摘要:
The present invention provides a fixing pressure roller exhibiting excellent compression set and having low hardness and low heat capacity, as well as a fixing device including the fixing pressure roller. A pressure roller employed in a fixing unit of a fixing device includes a core, and an elastic layer provided around the core, wherein the elastic layer is formed of a silicone rubber product produced by mixing a silicone rubber raw material with resin microballoons and water, and then curing the silicone rubber raw material; and the silicone rubber product includes therein voids provided by breakage of the resin microballoons through application of pressure, and voids provided through evaporation of the water.
摘要:
An image fixing device includes an elastic roller; a back-up unit forming a fixing nip with the roller therebetween, the back-up unit including a cylindrical film, a film guide, extending inside the film, for guiding the film, and an end portion guiding member including a guiding portion for guiding an inner surface of an end portion of the film. The film guide includes plural ribs contacting the film and arranged in a generatrix direction at positions upstream of the fixing nip with respect to a feeding direction of a sheet. The ribs have free end portions retracted more toward a downstream side with respect to the feeding direction of the recording material than the guiding portion of the end portion guiding member. An inside rib has a free end portion which is retracted more toward the downstream side than free end portions of the opposite end ribs.
摘要:
A fixing device includes a fixing rotary body and a pressing rotary body disposed opposite the fixing rotary body. A pivotable pressurization member contacts and presses the pressing rotary body against the fixing rotary body. A pressurization pivot is provided on the pressurization member. A depressurization member, pivotable about the pressurization pivot, causes the pressurization member to isolate the pressing rotary body from the fixing rotary body. A depressurization pivot is provided on the depressurization member. A lock is pivotable about the depressurization pivot and engageable with the pressurization pivot. A biasing member, anchored to the lock, exerts a resilient bias that allows the lock to cause the pressurization member to press the pressing rotary body against the fixing rotary body. A detent is situated in a pivotal trajectory of the lock to restrict pivot of the lock by contacting the lock.