JPS59129885A - Recording device - Google Patents

Abstract

PURPOSE:To prevent the temperature rise of an image forming body and to prevent the generation of a dewdrop at the time of stop of an operation by providing a shielding member for shielding an intermediate transfer body side against the image forming body side. CONSTITUTION:The intermediate transfer body 5 is press-contacted to the image forming body 1, and a recording paper pressure roller 6 is press-contacted to the intermediate transfer body 5. Also, this device is provided with a shielding member 7 for shielding the intermediate transfer body 5 side against the image forming body 1 side. According to such a constitution, air heated by a heat source 5A and 6A of the intermediate transfer body 5 side is reduced to shift to the image forming body 1 and to prevent the temperature rise of the image forming body 1, etc. and a drop of an image forming capacity. Also, it is prevented that vapor from recording paper, etc. Flows into the image forming body 1, etc. at the time of stop of an operation to form a dewdrop by natural cooling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a recording device such as an electrophotographic copying machine, and in particular, a toner image formed on an image forming body is pressed against the image forming body and rotated. The present invention relates to an improvement in a recording apparatus that transfers a toner image onto an intermediate transfer member, heats the transferred toner image, and fixes the transferred toner image onto a recording sheet that is fed while being in pressure contact with the intermediate transfer member.

[Prior art]

In the conventional recording apparatus as described above, the toner image transferred to the intermediate transfer body is heated and transferred to the recording paper and fixed, so the heated air on the intermediate transfer body side moves to the image forming body side and the image forming body etc. This may cause the temperature of the image forming body to rise and the image forming performance of the image forming body to deteriorate.Furthermore, if the operation is stopped and the image forming body is allowed to cool down naturally, the recording paper contained in the heated air will be removed. There are problems in that the steam condenses on the surface of the image forming body, which may impede image formation when the operation is resumed or cause rust on metal parts.

[Purpose of the invention]

The present invention has been made in order to solve the above-mentioned problems in conventional recording devices, and it is relatively unlikely to increase the temperature of the image forming body, etc., and prevents dew condensation on the image forming body etc. when the operation is stopped. The present invention provides a recording apparatus that performs thermal transfer recording using an intermediate transfer member, which does not cause the occurrence of thermal transfer.

[Structure of the invention]

The present invention transfers a toner image formed on an image forming body to a rotating intermediate transfer body by pressing the image forming body, and thermally transfers the transferred toner image to a recording paper that is fed by pressing the intermediate transfer body. The recording apparatus is characterized in that a shielding member is provided for shielding the intermediate transfer body side from the image forming body side from the pressure contact portion to the image forming body.

In the present invention, the shielding member that shields the intermediate transfer body side from the image forming body side mainly serves to thermally shield the two, and protects the image forming body from heat generated on the intermediate transfer body side. It is functional and is made of heat-resistant heat insulating material. Heat-resistant insulation materials include polyamide,
Woven or non-woven fabrics made of fibers such as polyamideimide, polyimide, glass, or asbestos are used.

In order to further improve heat insulation properties, we have installed an aluminum foil layer on the inside of these woven or non-woven fabrics, which will be on the side of the intermediate transfer body, for heat reflection, and added a layer of foamable urethane rubber on the outside to improve heat insulation properties. A layer of silicone rubber or the like may also be provided. Further, a metal layer may be provided as a reinforcing material.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic side view showing one example of the recording apparatus of the present invention, and FIG. 2 is a partial side view showing another example.

In the figure, 1 is an image forming body that rotates in the direction of the arrow; 2 is a cleaning device that cleans the surface of the image forming body 1;
3 is a latent image forming device that forms an electrostatic latent image or a magnetic latent image on the surface of the image forming body 1 cleaned by the cleaning device 2; 4 is a dry developing device that develops the formed latent image into a toner image; 5; is an intermediate transfer member that is pressed against the image forming member 1 and rotates in the direction of the arrow to transfer the toner image to the transfer layer on the surface;
6 is a recording pressure roller that is brought into pressure contact with the intermediate transfer body 5 and feeds the recording paper P; 5A and 6A are respectively used to press the intermediate transfer body 5 so that the toner image is transferred from the intermediate transfer body 5 to the recording paper P and fixed thereon; A heat source such as an infrared lamp or a resistance heating element provided inside the transfer body 5 and the recording press roller 6; 7 a shielding member for shielding the intermediate transfer body 5 side from the image forming body 1 side; 8;
Reference numeral 9 indicates an outer circumferential cover of the intermediate transfer member 5, and 10 indicates an outer circumferential cover of the recording press roller 6.

The image forming body 1 has an electrophotographic photoreceptor on the surface when the recording device is based on electrophotography, and has a conductive substrate and a dielectric surface layer on the surface when the recording device uses electrostatic recording. In the case of recording using a magnetic recording method, the recording medium has a magnetic material on the surface. The cleaning device 2 is equipped with a static elimination mechanism and a toner removal mechanism for the surface of the primary image forming body 1 when using an electrophotographic method or an electrostatic recording method, and a primary image forming device when using a magnetic recording method. It is equipped with a demagnetizing head for the surface of the image forming body 1 and a toner removal mechanism.

If the latent image forming device 3 is based on electrophotography, it is equipped with a charging mechanism that uniformly charges the surface of the primary image forming body 1 and an image projection mechanism that exposes the charged surface with an image. In the case of a recording method, it is equipped with a multi-stylus electrode or ion control electrode that forms an electrostatic latent image on the dielectric surface according to the image signal, and in the case of the magnetic recording method, it is equipped with a multi-stylus electrode or ion control electrode that forms an electrostatic latent image on the dielectric surface according to the image signal. It is equipped with a magnetized head that forms a latent image. Note that the cleaning device 2 may not be provided with a static eliminating mechanism or a demagnetizing head, and the latent image forming bag @3 may be used to eliminate static and demagnetize. In the case of electrophotography or electrostatic recording, the dry developing device 4 charges the toner to the opposite polarity to the charge of the electrostatic latent image and supplies it to the surface of the primary image forming body 1; In this case, magnetic toner is supplied to the surface of the primary image forming body 1. The intermediate transfer body 5 has a structure in which an adhesive transfer layer such as silicone rubber is provided on the surface of a roller core made of metal such as aluminum, which is provided with a heat source 5A inside, and the recording press roller 6 is provided with a heat source 6 inside.
It consists of a metal roller provided with A, or an elastic layer such as silicone rubber or fluorine-based comb provided on its surface. The shielding member 7 is made of a heat-resistant heat insulating material as described above, and in the one shown in FIG. 1, the lower part is open.
The one shown in Figure 2 is shaped like a duct, inside which air is forced to flow from one side to the other as shown by the thick arrow, and is then discharged to the outside of the device. It is composed of The outer circumferential covers 8 and 9 of the intermediate transfer body 5 and the outer circumferential cover 10 of the recording press roller 6 are intended to prevent the surfaces of the intermediate transfer body 5 and the recording press roller 6 from coming into contact with outside air and dropping in temperature. Preferably, it is made of metal or heat-resistant resin, and the inner surface has a mirror surface that reflects heat rays. As mentioned above, it is preferable that the inner surface of the shielding member 7 is mirror-finished.

〔Effect of the invention〕

In the recording apparatus of the present invention configured as described above, since the intermediate transfer body 5 side is shielded from the image forming body 1 side by the shielding member 7, the intermediate transfer body 5 side is not heated by the heat sources 5A and 6A on the intermediate transfer body 5 side. The amount of air transferred to the image forming body 1 side is reduced, and as a result, the intermediate transfer body 5 and the recording pressure roller 6 are
Transcribes the temperature of.

Even if the fixing is optimized, the temperature rise of the image forming body 1, etc. will be reduced, and a stable and clear recorded image can be obtained. Excellent effects can be obtained in that dew condensation on the first and second parts is eliminated, and problems with image formation and rust on metal parts when restarting operation are also eliminated. If the shielding member 7 is formed in the shape of a duct to allow ventilation to flow through the shielding member 7 as in the example shown in FIG. 2, the above-mentioned effect will be further enhanced.

Note that the present invention is not limited to the illustrated example, and the outer covers 8 to 10 of the intermediate transfer body 5 etc. may be omitted, or the position of the outer cover 8 and the feeding of the recording paper P may be changed in place of the built-in heat sources 5A and 6A. A heater that heats the surface of the intermediate transfer member 5 and a guide heater that heats the recording paper P may be provided on the side.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one example of the recording apparatus of the present invention, and FIG. 2 is a partial side view showing another example. 1... Image forming body, 2... Cleaning device, 3... Latent image forming device, 4... Dry developing device,
5... Intermediate transfer body, 6... Recording pressure roller, 5A, 6A... Heat source, 7... Shielding member, 8.9... Intermediate transfer body outer periphery cover, 10... Recording pressure roller outer cover. Patent Applicant Konishiroku Photo Industry Co., Ltd. Agent Patent Attorney Haru Yasushi - Sales Figure 2

Claims (2)

[Claims] (1) The toner image formed on the image forming body is transferred to a rotating intermediate transfer body by pressing against the image forming body, and the transferred toner image is transferred by heating and transferring while being pressed against the intermediate transfer body. A recording apparatus for fixing, characterized in that a shielding member is provided for shielding a pressure contact portion to the image forming body and an intermediate transfer body side from the image forming body side. (2) The recording apparatus according to claim 1, wherein air is forced to flow between the shielding member and the intermediate transfer body.