JP2001249563A - Electromagnetic induction heating coil for heat fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating coil for a heat fixing device capable of realizing quick start in addition to the shortening of warm-up time until attaining fixed temperature and power saving by using an electromagnetic induction heating type heat fixing device having high heating efficiency. SOLUTION: This electromagnetic induction heating coil 3 for a heat fixing device used in a stage where it is inserted through a heat fixing roller consisting of magnetic substance and used for the heat fixing device of a copying machine is formed of one or plural coils wound round an I-shaped bobbin 4 in the longitudinal direction of an electromagnetic induction heating roller 1, inserted through the roller 1 through a heat insulating roll 2 inside which a continuous hollow part 9 is formed, and connected to a heating power source circuit, and also it is cooled by a cooling fan provided on the end face side of the roll 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fixing device provided in a copying machine, and more particularly to an electromagnetic induction heating coil for a heat fixing device used for an electromagnetic induction heating type heat fixing roller.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine or a printer is provided with a heat fixing device for forming an image, and an image forming apparatus such as an electrophotographic process, an electrostatic recording process, and a magnetic recording process. An image is formed on a recording material (transfer material sheet, electrostatic recording paper, electro-fax paper, printing paper, etc.) by a transfer method or a direct method in a forming unit, and a transfer image (toner) corresponding to target image information is formed. image)
Is fixed to the surface of the recording material as a permanent image. As this fixing device, for example, there is a heating roller type having a structure in which a pressing roller is elastically contacted with a rotatable heating roller through which a heater is inserted. Specifically, a heating roller-type fixing device using a halogen heater as a heating source is generally known.

[0003]

In the above-described conventional heat fixing device, for example, a halogen heater mounted in a heat fixing roller formed of an aluminum hollow metal roller is used as a heat source. Then, the halogen heater generates heat,
When light is emitted, the heat is radiated and convectively heats the aluminum hollow metal roller, which is the heat fixing roller. The heated heat fixing roller has a uniform temperature distribution throughout the roller due to heat conduction, and the transferred image Is fixed on the surface of the recording material by heating as a permanent image. By the way, when a halogen heater is used as a heating source, the time required for the entire roller to have a uniform temperature distribution, that is, the warm-up time becomes longer, so that it is necessary to cope with recently demanded power saving. Was extremely difficult. In addition, since it takes a long time for the entire heating roller to reach a uniform temperature distribution, so-called quick start is difficult, and when the image forming apparatus is in a standby state in which the printing operation is stopped, the standby state is determined according to the standby state. Had to be adjusted to the standby temperature.

[0004] In order to solve these difficulties, a heat fixing apparatus using an electromagnetic induction heating coil having high heating efficiency has been started to be studied. When the electromagnetic induction heating coil is used as a heating source of the heating and fixing device, it is also confirmed that the temperature of the heating coil reaches 200 ° C. or more due to radiant heat from the heating roller and heat due to copper loss of the coil itself. I have. On the other hand, such an electromagnetic induction heating coil generally uses an enamel wire having a high heat-resistant temperature such as a polyamide imide copper wire, a polyester imide / polyamide imide copper wire, a polyimide copper wire, and a polyester imide copper wire.
However, since the temperature of the electromagnetic induction heating coil reaches 200 ° C. or more, when the electromagnetic induction heating coil is used as a heating source of the heating and fixing device, the heating and fixing roller can be efficiently heated. It was necessary to cool the heating coil itself efficiently.

Accordingly, an object of the present invention is to reduce the warm-up time required for the heat fixing roller to reach a certain temperature by using an electromagnetic induction heating type heat fixing device having a high heating efficiency, thereby saving power. Another object of the present invention is to provide an electromagnetic induction heating coil for a heat fixing device that can be quickly started.

[0006]

According to the present invention, there is provided an electromagnetic induction heating coil for a heat fixing device of a copying machine which is inserted and used in a heat fixing roller made of a magnetic material. The electromagnetic induction heating roller 1 is formed by one or a plurality of coils wound around the I-shaped bobbin 4 in the longitudinal direction thereof, and the electromagnetic induction heating is performed via the heat insulating roll 2 forming a continuous hollow portion 9 therein. An electromagnetic induction heating coil for a heating and fixing device, characterized in that it is inserted into a roller 1 and connected to a heating power supply circuit, and is configured to be cooled by a cooling fan provided on an end face side of the heat insulating roll 2. I do.

According to an aspect of the present invention, the electromagnetic induction heating coil 3 is formed of one or a plurality of coils wound around an I-shaped bobbin 4 and forms a continuous hollow portion 9 on the inside thereof. , And is used by providing a cooling fan on the end face side of the heat insulating roll 2, so that radiant heat from the heat fixing roller 1 to the electromagnetic induction heating coil 3 is blocked. Also,
Since the heat of the winding of the electromagnetic induction heating coil 3 is exhausted to the outside of the heating and fixing device by the cooling fan as hot air 5, only the temperature of the electromagnetic induction heating coil 3 is efficiently reduced without lowering the temperature of the heating and fixing roller 1. be able to. As a result, the conventionally used enameled wire can be used for the electromagnetic induction heating coil for the heat fixing device of the copying machine.
Further, the electromagnetic induction heating type heat fixing device has a high heating efficiency, shortens a warm-up time, and can provide a heat fixing device capable of saving power and supporting quick start.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Note that the present invention is not limited by this. FIG. 1 is an explanatory view showing a configuration of a heat fixing device according to the present invention, FIG. 2 is an explanatory view showing a main part configuration of an electromagnetic induction heating coil according to the present invention, and FIG. FIG.

In FIG. 1, reference numeral 1 denotes a heat-fixing roller made of iron, which is a ferromagnetic material, and a pressure roller 7 made of rubber or resin.
These constitute a roller-type heat fixing device. Also,
The heat fixing device includes a heat fixing roller 1 and a pressure roller 7.
Has a basic structure, and the pressure roller 7 is configured to elastically contact the rotatable heat fixing roller 1. And this roller pair 1,
The recording medium to be image-fixed is nipped and conveyed while the recording material to be image-fixed is introduced into the heating nip portion 8 which is a pressing portion of the roller pairs 1 and 7 by the rotation of The unfixed image is soaked into the surface of the recording material by heat fusion to fix the image. Inside the heat-fixing roller 1, a heat-insulating roll 2 made of a heat-resistant resin and electrically insulating to form an electromagnetic induction heating coil 3 and form a continuous hollow 9 inside the heat-fixing roller 1. It is inserted and used with a gap between them.

The heat insulating roll 2 can withstand radiant heat from the heating and fixing roller 1 to the electromagnetic induction heating coil 3 and heat of the electromagnetic induction heating coil 3 itself (200 ° C. or more), for example, Teflon (registered trademark) PFA. (Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), heat-resistant materials such as PBT (polybutylene terephthalate), silicone, and PP (polypropylene).

Reference numeral 3 denotes an electromagnetic induction heating coil which is a feature of the present invention. As shown in FIG.
Is formed by one or a plurality of coils wound on the I-shaped bobbin 4 in the longitudinal direction. Specifically, a 0.3 mmφ / 30 enamel wire composed of a polyamideimide copper wire, a polyesterimide / polyamideimide copper wire, a polyimide copper wire, a polyesterimide copper wire, etc. having excellent heat resistance is used as one wire.
Although it is constituted by one coil wound by 2 to 16 turns, it may be constituted by a plurality of coils, and it is needless to say that the number of turns and the wire diameter can be variously changed. In addition, the electromagnetic induction heating coil 3 is inserted into the electromagnetic induction heating roller 1 via the heat insulating roll 2 forming a continuous hollow portion 9 therein, is connected to a heating power supply circuit, and has a cylindrical heat insulating roll. 2 is used so as to be cooled by a cooling fan (not shown) provided on the end face side.

Reference numeral 4 denotes an I-shaped bobbin for winding the electromagnetic induction heating coil 3, and the electromagnetic induction heating coil 3 wound on the I-shaped bobbin 4 is a heat insulating roll forming a continuous hollow portion 9 therein. 2, the cooling roller (not shown) is disposed on one of the end surfaces of the heat insulating roll 2 in practical use. The I-shaped bobbin 4 is made of a material having excellent mechanical strength and heat resistance, such as PP (polypropylene), PBT (polybutylene terephthalate), and PET (polyethylene terephthalate).
And the like are suitable.

When the electromagnetic induction heating coil 3 configured as described above is used for a heating fixing device, the electromagnetic induction heating coil 3
Radiant heat from the heat fixing roller 1 to the heat insulating roller 2
In addition, the heat of the winding of the electromagnetic induction heating coil 3 is exhausted as hot air 5 out of the copying machine by a cooling fan provided on one of the end faces of the heat insulating roll 2. As a result,
It is possible to efficiently lower only the temperature of the electromagnetic induction heating coil 3 to 200 ° C. or less without lowering the temperature of the heat fixing roller 1 at the time of printing, and a conventionally used enameled wire is used for the electromagnetic induction heating coil. It has become possible to provide a copying machine having an electromagnetic induction heating type heat fixing device with high heating efficiency. Further, a warm-up time can be reduced, and a heat fixing device capable of coping with power saving and quick start can be provided.

[0014]

According to the present invention, a conventionally used enameled wire can be used for an electromagnetic induction heating coil serving as a heating source of a heating and fixing device, and a copying machine equipped with a heating and fixing device with high heating efficiency. In addition to the above, it is possible to provide a copier or a printer capable of reducing power consumption and quick start by shortening a warm-up time, and has a great practical effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a heat fixing device according to the present invention.

FIG. 2 is an explanatory diagram showing a main configuration of an electromagnetic induction heating coil according to the present invention.

FIG. 3 is a sectional view showing a configuration of an electromagnetic induction heating coil according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat fixing roller 2 Insulating roll 3 Electromagnetic induction heating coil 4 I-shaped bobbin 5 Hot air 7 Pressure roller 8 Heating nip 9 Hollow

Claims (1)

[Claims] 1. An electromagnetic induction heating coil for a heat fixing device of a copying machine inserted and used in a heat fixing roller made of a magnetic material, wherein the electromagnetic induction heating coil 3 is arranged in a longitudinal direction of the electromagnetic induction heating roller 1. A heating power source formed by one or a plurality of coils wound around an I-shaped bobbin 4 and inserted into the electromagnetic induction heating roller 1 through a heat insulating roll 2 forming a continuous hollow portion 9 therein. An electromagnetic induction heating coil for a heat fixing device, wherein the coil is connected to a circuit and is configured to be cooled by a cooling fan provided on an end face side of the heat insulating roll 2.