Abstract: An apparatus for forming color toner images on an electrophotographic photosensitive drum and transferring the color toner images onto a transfer drum, is provided with plural color development devices positioned along the rotating direction of the photosensitive drum and opposed thereto, and the above-mentioned transfer drum of a peripheral length is capable, in the rotating direction of the photosensitive drum, of simultaneously supporting two images of a maximum length L to be formed, wherein a relation:d.sub.p =(2.pi.R-2L)/2>d.sub.s .gtoreq.2r+(V.sub.p /V.sub.s).pi.ris substantially satisfied among the peripheral length A of the transfer drum, radius R and peripheral speed V.sub.p of the transfer drum, radius r and peripheral speed V.sub.s of the developing rollers of the development means, distance d.sub.p of two images on the transfer drum, and distance d.sub.s of the developing rollers in the rotating direction of the photosensitive drum.

Abstract: A laminate film suitable for providing a transparency for an OHP (overhead projector) is formed by disposing an absorbing layer on a substrate. The absorbing layer functions to allow addition of a wax component to a toner so as to improve the color mixing characteristic and anti-offset characteristic of the toner without causing a wax exudation trace which is liable to occur in a fixed toner image if the absorbing layer is not provided.

Abstract: An image forming apparatus including a rotatable member having an image bearing portion on the surface thereof, image forming device for forming a toner image on the surface of the rotatable member, detecting device for detecting the density of the toner image formed on the surface of the rotatable member under predetermined image forming conditions, and control device for controlling the image forming conditions of the image forming device on the basis of the detection output of the detecting device. The apparatus further includes a memory for storing therein the eccentricity data of the rotatable member, and correcting device for correcting the detection output of the detecting device.

Abstract: A heating and color-mixing apparatus includes a heater; a film movable together with a recording material supporting a multi-layered unfixed toner image; a pressing member cooperative with the film to form a nip therebetween; the recording material being passed through the nip with its toner image contacted to the film, so that different color toners of the toner image are mixed by heat from the heater and pressure applied by the nip; wherein at least a recording material side of the film is composed of a silicone rubber.

Abstract: A developing agent density control method includes the steps of forming a density control latent image with a predetermined potential on an image carrier, developing the density control latent image by applying a density control development bias and using a two-component developing agent having a toner and a carrier, sensing the density of the density control image, and controlling a toner-to-carrier ratio on the basis of the sensed density. In this method, the density control development bias is different from a print development bias.

Abstract: This invention relates to a fixing device including a pair of rotary members for pinching and transporting therebetween a recording material bearing an unfixed image, thereby fixing the unfixed image, and applicator means for applying releasing agent onto at least one of the paired rotary members. When the recording material is a resinous recording material, the applicator means is adapted to apply the releasing agent excluding a portion of the rotary member corresponding to the leading end portion of the recording material.

Abstract: The invention is for an elastic body formed by addition reaction type silicone rubber elastic material. The material is obtained by curing a polysiloxane mixture including at least (a) straight-chain dimethyl polysiloxane having the viscosity of 8000 poise or more at a temperature of 25.degree. C. and terminated with vinyl groups; and (b) resinous organopolysiloxane having at least two vinyl groups and having the viscosity of 10-1000 poise at the temperature of 25.degree. C. and a resin segment with at least one of a 4-functional constitutional unit and a 3-functional constitutional unit, and an oil segment with a 2-functional constitutional unit. The elastic body is used in forming an elastic roller and fixing device using an elastic roller.

Abstract: A fixing device having a heating roller and a pressure roller each of which has an elastic layer provided thereon and which touch each other to form a nip. The elastic layer of the heating roller is thinner than that of the pressure roller, and/or the surface effective hardness of the heating roller is 85.degree. or less and that of the pressure roller 85.degree. or greater. The nip is substantially flat. The portion of a recording member exiting the nip proceeds along a path substantially away from the heating roller.

Abstract: A recording material, particularly a resin film as a recording material, used in an image forming apparatus in which a toner image is formed on the recording material and then fixed thereto by applying at least pressure to the toner image using a fixing rotatable member coated with a releasing agent is disclosed. The recording material has a base layer, a first resin layer having compatibility with the toner used greater than with the base layer, and a second resin layer absorbing a releasing agent. Alternately, a resin layer provided on the base layer, the resin layer having compatibility with the toner greater than with the base layer and containing a releasing agent absorbing substance.

Abstract: This invention relates to a fixing device with a heat rotatory body heated by a heating source having a surface layer of a silicone rubber; a back-up rotatory body which is in pressure contact with the heated rotatory body; an oil feeding apparatus which feeds silicone oil to the heated rotatory surface; the pair of rotatory bodies performing fixing while conveying the supporting material having unfixed images supported thereon sandwiched therebetween; and the feeding oil being a phenyl type silicone oil and the silicone rubber surface being impregnated with dimethylsilicone oil.

Abstract: A laminate film suitable for providing a transparency for an OHP (overhead projector) is formed by disposing an absorbing layer on a substrate. The absorbing layer functions to allow addition of a wax component to a toner so as to improve the color mixing characteristic and anti-offset characteristic of the toner without causing a wax exudation trace which is liable to occur in a fixed toner image if the absorbing layer is not provided.

Abstract: An image forming apparatus includes a recording material carrying unit for carrying and conveying a recording material. The recording material carrying unit can simultaneously carry a first sheet of recording material and a second sheet of recording material at different positions thereon. The apparatus also includes an image forming unit for forming an image on the recording material carried on the recording material carrying unit, and a fixing unit with a variable fixing speed for fixing the image on the recording material separated from the recording material carrying unit. An interval between the entering times of the first sheet of recording material and the second sheet of recording material carried on the recording material carrying unit is variable in accordance with the fixing speed.

Abstract: A rotatory member for fixing toner image onto a support member supporting toner image includes a core member, a first rubber layer provided on the core member, a second rubber layer provided on the first rubber layer, and a third rubber layer provided as the surface layer on the second rubber layer. Here, by making the third rubber layer, the second rubber layer and the first rubber layer to have their elongations larger in the order mentioned, peeling between the respective layers is prevented so as to withstand prolonged usage.

Abstract: An image forming apparatus includes an image bearing member; a device for forming an image on the image bearing member; a device for transferring the image from the image bearing member to an image receiving material, the transfer device including a device for carrying the image receiving material to an image transfer position where the image transfer device is operable, and the carrying device is capable of supporting plural image receiving materials simultaneously; a device for fixing the image having been transferred onto the image receiving material, the fixing device being selectively operable at a first fixing speed and a second fixing speed which is lower than the first fixing speed; wherein when the fixing device operates at the second fixing speed, the carrying device carries only one image receiving material.

Abstract: The present invention presents a rotatory member for fixing toner image onto a support member supporting toner image, which is constituted of a core member, an elastic layer provided on the core member, an intermediate layer provided on the elastic member, and a surface layer provided on the intermediate layer. The whole elastic layer is covered with the above intermediate layer, and also the coverage with the above intermediate layer is extended to the portion which blocks movement of the mold release agent provided around the journal portion of the core member. With such constitution, contamination within the main device with the mold release agent reaching from the rotatory member to the main device can be prevented.

Abstract: A fixing device includes a fixing rotating member for grasping and conveying a recording material supporting an unfixed image, and a coating means for coating release oil on the fixing rotating member.The rotating member includes an elastic layer and an offset prevention layer provided on the elastic layer.An oil absorption rate of the elastic layer for the oil is 5-20 wt %, and an oil absorption rate of the offset prevention layer for the oil is 30-150 wt %.

Abstract: An image forming apparatus includes a movable image bearing means, an image forming device for forming an image on the image bearing member, an image receiving material bearing member for carrying and conveying an image receiving material to an image transfer station where the image formed by the image forming device is transferred from the image bearing member to the image receiving material, an image transfer device disposed at the transfer station in opposition to the image bearing device, a discharger, disposed downstream of the image transfer device with respect to the movement direction of the image receiving material and in opposition to the image receiving material carrying member, and operative when a trailing edge of the image receiving material is substantially immediately before a transfer zone by the image transfer device or when it is in the transfer zone, during the period when the image receiving material is conveyed by the image receiving material carrying member.

Abstract: An image forming apparatus includes a movable image bearing member, a device for sequentially forming on the image bearing member images corresponding to different color information, a device for transferring onto an image receiving material the images formed on the image bearing member, image receiving material carrying member for carrying and conveying the image receiving material to an image transfer station where the image bearing means and the transfer device are opposed, wherein the images formed on the image bearing member are sequentially transferred superimposedly onto the image receiving material at the transfer station, a discharging device disposed downstream of the image transfer device with respect to movement detection of the image receiving material carrying member, a detector for detecting a temperature and a humidity within the image forming apparatus, and a control device for controlling outputs of the image transfer device and the discharging device on the basis of output from the detector

Abstract: An image forming apparatus including an image bearing member, a developing device for developing a latent image formed on the image bearing member and including a developer carrying member for carrying the developer toward the image bearing member, a toner content detecting device including a reflecting member for receiving light and reflecting a quantity of light corresponding to a reference toner content, a light emitting element and a light receiving element for producing an electric signal in accordance with a quantity of light applied to and received from the reflecting member, and a toner content control device for controlling toner supply to the developing device in accordance with a signal produced by the toner content detecting device. The toner content control device includes a device for storing a ratio of a reference toner content signal to a reference reflection density signal.