摘要:
An image forming apparatus has an image forming unit for forming an image on a recording material and a fixing unit for fixing the image to the recording material by nipping and conveying the recording material, the fixing unit including a heater which does not generate heat during a standby period in which a printing operation can be started. The heater generates heat for a predetermined period after the start of power supply to the apparatus and then the apparatus is rendered capable of the printing operation.
摘要:
An image fixing apparatus has a heater; a film; and a roller forming a nip with the heater with the film therebetween, the roller being driving to drive the film. A recording material carrying an unfixed image is fed by the nip so that the unfixed image is fixed on the recording material by heat from the heater, and the roller has a surface resin tube layer, wherein the center line average surface roughness Ra (.mu.m), a dynamic friction coefficient .mu., and a peripheral speed of the roller V (mm/sec) satisfy:when Ra 0.3,.mu..gtoreq.1.3.times.10.sup.-3 V+0.18when Ra.gtoreq.0.30.37.gtoreq.Ra.times..mu..gtoreq.6.4.times.10.sup.-4 V+4.8.times.10.sup.-3.The roller's surface resin tube layer includes two different types of resin or resin and rubber materials. The roller's tube layer is subject to electric discharge treatment.
摘要:
An image forming apparatus including an image bearing member for bearing an image thereon, an intermediate transfer member having a base body and an elastic member provided outside the base body and onto which an image is transferrable from the image bearing member, and a second transfer member forming a nip portion between the second transfer member and the intermediate transfer member, for transferring an image from the intermediate transfer member to a transfer material in the nip portion. The hardness of the surface of the second transfer member is greater than the hardness of the surface of the intermediate transfer member.
摘要:
An image heating apparatus includes a rotatable member; back-up means for cooperating with the rotatable member to form a feeding nip for feeding a recording material; heating means for heating an outer peripheral surface of the rotatable member, the heating means including a heater in the form of a plate cooperable with the rotatable member to form a heating nip.
摘要:
To provide a pressing rotor for a heating-fixing apparatus to permanently fix a toner image transferred onto a recording material by passing the image through a nip portion formed by a heating rotator and a pressing rotator, in which the pressing rotator has an elastic layer and a surface layer, and the surface layer is a tube made of a mixture of a fluororesin and a high-friction-factor resin having a friction factor higher than that of the fluororesin, and moreover, provide a heating-fixing apparatus comprising a pressing rotator of the above structure.
摘要:
In a method and apparatus for controlling the temperature of a fixing device of the film heating type and the pressure rotary member driving type and an image forming apparatus provided with this fixing device, at the start of printing, the output of a thermistor near a heater is detected, and when the temperature difference &Dgr;T=T2−T1 between the detected temperature T1 and the fixing temperature T2 is smaller than a desired temperature T0, the raising timing of the heater is delayed. Thereby, a pressure roller is not-excessively warmed at hot start and slip can be prevented. Also, in the image forming apparatus having the film heating type fixing device, in the next printing after the lapse of a predetermined time after the termination of a printing operation, the target temperature and heater electrical energization starting timing of the fixing device are changed in conformity with the temperature of the fixing device. The apparatus has an atmospheric temperature sensor, and in the next printing after the lapse of a predetermined time after the termination of a printing operation, the target temperature and heater electrical energization timing of the fixing device during the initial rotation operation in the printing, operation are changed in conformity with the atmospheric temperature detected by the atmospheric temperature sensor and the temperature of the fixing device.
摘要:
In an image heating apparatus, a film has one face in sliding contact with a heater having a heat generating portion on a substrate. The other face of the film contacts a recording material bearing an image. The film moves with the recording material and the image on the recording material is heated by heat generated by the heater which is transmitted through the film. A temperature detecting element detects the temperature of the heater. The heat generating portion of the heater has a first heat generating portion and a second heat generating portion on the downstream side of the first heat generating portion with respect to the moving direction of the film. The middle of the temperature detecting element is positioned at the upstream side of the middle between the first and second heat generating portions with respect to the moving direction of the film.
摘要:
In a fixing device, a core material of a fixing rotating member has two largest-diameter portions respectively located between a central portion and each end portion of the fixing rotating member, within a region where a recording material of a largest size passes, and the diameter of each core material is gradually reduced from the largest-diameter portion toward the central portion and toward the nearest end portion. The outer shape of the fixing rotating member conforms to the shape of the core material. According to this configuration, it is possible to prevent corrugation and curl of the recording material, and to provide excellent mountability of the recording material.
摘要:
An image heating apparatus used in an image forming apparatus includes a heating member fixedly disposed, a heat rotary member that slides while an inner surface of the heating member is in contact with the heating member, and a pressure rotary member that forms a heating member and a nip portion through the heating rotary member, in which a recording material that bears an image is nipped between the heating rotary member and the pressure rotary member at the nip portion and conveyed, and the image on the recording material is heated by heat from the heating member through the heating rotary member. In order to obtain a stable heating property (fixing property) not depending on the kind of paper of a recording material (a smooth paper, a rough paper), the temperature of the heating member or the heating rotary member is detected, and the current to the heating member is controlled so that the detected temperature becomes a target temperature. In this situation, the supply power amount to the heating member is monitored, and the target temperature is corrected on the basis of the monitor result. Also, when the temperature detected by the temperature detecting device is within a given range, the current to the heating member is controlled so that a given power is supplied to the heating member.
摘要:
A timer for measuring the image formation interval, and the fixing temperature is set in response to the measured image formation interval so as to balance satisfactorily the degree of fixation, the amount of the recording material curling, and the recording material wrinkling no matter what timing is used to start the next image formation after the completion of the preceding one.