JPS61261763A - Fixing device for electrophotographic recording device - Google Patents

Abstract

PURPOSE:To control temperature easily by constituting a heat roller of a conductor and arranging an AC magnetic field generating coil for generating heat on the basis of loss of eddy current on a position of the heat roller to be contacted with recording paper at the transfer of the recording paper or its adjacent position. CONSTITUTION:The recording paper 3 to which unfixed toner is adhered is held and carried between the heat roller 1 and a rotating roller 2 which are oppositely arranged. The roller 2 is made of an elastic, hard and heat resisting material and the roller 1 is made of a conductor such as iron, aluminum and copper. The AC magnetic field generating coil 5 for generating the magnetic field by a high frequency power source 4 is arranged near the position on the roller 1 where the roller 1 is contacted with the recording paper 3 so as to be applied to the whole width. When the recording paper 3 to which the unfixed toner is adhered is carried up to the position close to the gap between both the rollers 1, 2, the arrival of the recording paper 3 is detected and current is supplied to the coil 5, so that the AC magnetic field is generated. In the AC magnetic field, the roller 1 is rotated and heat is generated due to the loss of eddy current. Thus, the temperature control can be easily attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a method for fixing unfixed henna transferred onto recording paper-1-1 by JS on an electronic photo recording board 1-1. The present invention relates to a fixing device for an electrophotographic recording device.

(Prior Art) As conventional technologies, a heat roller fixing device and a pressure fixing device are known. Heat roller fixing neck (3J1, Teflon, etc.) 7
11 heat 1-1-la, bullet rate 14, relatively heat resistant ↑4
Rotating material made of silicone rubber etc. with a [1-ra]. The heating n-ra is cylindrical and has approximately IKW inside.
It is installed as a heat source for heating. A relatively small pressure of approximately 1 Kgf/cnf is applied between the rotation of the heating roller and the rotation of the heating roller. The developer such as 1 to ner is fixed and coated on the paper by the LF force between 1 and 2.The force fixing device is driven by two rotating rollers made of metal with a specific gravity of SK material or the like.

A large linear pressure of about 35 If/cm is mechanically applied between the two rollers. A recording paper is sandwiched between these two rollers, and a large pressure is applied to the paper. of developer is fixed on paper.Among these fixing devices, from the point of view of thermal efficiency and space efficiency, devices that use heated rollers are often used, The time it takes to reach the operating temperature (so-called
For example, Japanese Unexamined Patent Application Publication No. 123580/1983 discloses a method for shortening the processing time (mix-up time). This is done by installing an oil layer electrical resistor on the circumference of the internal roll as a heating roller, and then using a roller purchased with one layer of material on the surface once a month. There are 1, 1, 1, and 5 people in the fixing device (11, 11, 1, 1, 1, 1, 1, 1, and 11)), and 5 people (J, ML, and ML) are present at the fixing process.

(Problem to be solved by the invention) -1- In the prior art, heat [1-Ra fixing device V41J
``1-The heat capacity of the device is large because it heats the body,
For this reason, the power consumption is large, the heating time is poor, the heat diffusion from the 7111 heat 1-1-ra surface is large, so an air conditioner is required, the humidity response is poor, and the temperature is low. The rotation is relatively rotational. In addition, with the pressure electrodeposition device, the constant adhesion of the horns is poor compared to the heat roller fixation, the fixed image is glossy and the image is difficult to produce, and the weight of the device is large due to the use of metal rollers.
1) A special mechanical mechanism is required to achieve the 41 loft force per person required for the larger drive I to lJ of the rotation. Roughly speaking, the above-mentioned publication has the above-mentioned heat [
] - With a heating roller heating device A - It is a device that increases the heating up time and the point of zero shrinkage, but it heats the heating roller conductor, and as mentioned above comes from the fact that the heat capacity of the device is large. However, there are still some problems. Furthermore, in order to prevent heat from the heating roller from being transmitted to the pressure roller during warming up, it is necessary to keep the heating roller and pressure roller apart at all times, which makes the mechanism complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing device that has a significantly small heat capacity, low power consumption, high temperature responsiveness, instantaneously reaches an operating temperature, and is easy to control.

(Means for Solving the Problems) The present invention comprises a rotating roller 2 that transfers the recording paper 3 by sandwiching it therebetween, and a heating roller 1 that holds a conductor.The roller 1 contacts the recording paper when the recording paper 3 is transferred. At or near the heating roller 1, an alternating current magnetic field generating coil 5 is arranged to generate heat due to eddy current loss.

(Function) When a current is supplied to the alternating current magnetic field generating coil during transfer of the recording paper, an alternating magnetic field is generated and an eddy current is generated in the conductor of the heating roller. This thin current loss causes the conductor to heat up,
This heat fixes the image on the recording paper.

(Example) In FIG. 1, heating rollers 1 arranged oppositely
The recording paper 3 on which unfixed toner has adhered is sandwiched between the rotating roller 2 and the rotating roller 2 and transported. By rotating the heating roller 1 clockwise and the rotating roller counterclockwise, the recording paper 3 is fed leftward. The rotating roller 2 is made of a material with elasticity, hardness, and heat resistance, such as silicone rubber. Heating [1-La 1 is iron,
Aluminum.

It is made of a conductor such as copper and has a cylindrical shape.

A coil 5 for generating an alternating current magnetic field by a high-frequency power source 4 is disposed over the entire width of the recording paper 3 in the vicinity of the heating roller 1 or the heating roller 1 that comes into contact with the recording paper 3 when the recording paper 3 is transferred. It is. The alternating current magnetic field generating coil 5 is provided with a heating 1 externally at a position immediately before the heating roller 1 moves to the contact position with the recording paper 3.
-1-It is set opposite to La 1 (J).

Unfixed] edge - 1, recording paper 3 or both -
When the current reaches the vicinity where it is supplied between the coils λ1 and λ1, a current is supplied to the coil 5 and an alternating magnetic field is generated. The heating roller 1 rotates in this alternating magnetic field, generating eddy current in the conductor and generating heat due to eddy current loss. This heat generating portion of the heating roller 1 contacts the supplied recording paper 3 and fixes the toner.

The operating temperature for fixing toner on recording paper is usually 150'
Since the temperature is set between C and 200 C, power of 30 to 60 W/cffl is supplied to obtain the heat. Alternatively, it may be supplied with commercial power, but if a high frequency power of several kilohertz to several kilohertz is supplied, the operating temperature will be reached instantaneously.

In the example shown in the second figure, the heating roller 11 is heated from three layers.
A conductor layer 17 is formed on the surface of the heat insulating support 16, and a surface protection layer 1B is formed on the surface. The surface protective layer 18 is made of a material with good wear resistance, such as tantalum oxide, or a material with good H-type properties. The rotating roller 12 is hollow, and is placed inside the contact position with the recording paper 3, facing the heating 1-1-ra 11, for generating an alternating current magnetic field.
15 is set up. When a current is supplied to the coil 15 and an alternating current UK field is generated, an eddy current is generated in the conductor @17 of the heating roller 11 in the alternating magnetic field, and heat is generated due to the thin current loss, fixing the toner.

In the example shown in the third figure, the heating roller 21 has the same structure as that shown in the second figure, and is hollow. They are placed facing each other. In this example as well, a thin current is generated in the conductor layer 27 of the heating roller 21 as in the upper side,
I get a fever.

In the example shown in the fourth figure, a coil 35 for generating an alternating current magnetic field is provided inside a heating roller 31 and a hollow rotating roller 32, which are hollow and have the same configuration as those shown in the second figure.

35B are provided facing each other. Coil 35A.

When current is supplied to 35B, the current flows across the heating roller 31 and rotating roller 32. An f-field is generated, and therefore the magnetic flux density is greater than that on the upper side, causing eddy currents in the conductor layer 37 of the heating roller 31, and the eddy currents easily generate heat.

In this way, in the present invention, a3-C1 alternating current magnetic field is generated near the position of heating 1-1-1 and IJ, which is in contact with the recording paper being distributed, heating 1''-1 of the Heat generation position is 81
2. There is C' in 1b which means 1-min 4r position in case of contact with recording paper and its heat.

(Effect of explanation) As described above, according to the present invention, heat generation is avoided only in the vicinity of the area where the recording paper comes into contact with the heating plate. , surface radiant heat also decreases,
It is said that the Urakashi Electric Power Company is small and does not require an air conditioner due to the heat emission and small size, making it possible to make it smaller.

Furthermore, if a high frequency power source is used, the operating temperature can be reached instantaneously, and the temperature can be easily reached, which is effective for speeding up the operation. In addition, by constantly rotating the rotating roller and the heating roller, there is no need for a complicated mechanism, and the structure is simple.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part, Fig. 2 IJ is a sectional view of the concave part according to the example of the samurai, Fig. 3 is a sectional view of the main part showing the example of the samurai, and Fig. 4 is a sectional view of other parts. FIG. 4 is a cross-sectional view of a recessed portion, showing an example. 1.11, 21.31...Heating 1-1-ra, 2.12
．． 22.32...Rotation [1-ra, J3...611 recording paper, 5.15.25.35A, 351-3...AC Mi world origin IroFF-1il, 17.27.3
7...Conductor. 11861-261763 (4) Figure 8, r). k ”” □ 43 ・
''' (35B

Claims (1)

[Scope of Claims] 1. Consisting of a rotating roller and a heating roller that are arranged opposite to each other and transport the recording paper with unfixed toner attached therebetween, the heating roller having a conductor. An electrophotographic recording device, characterized in that an alternating current magnetic field generating coil for generating heat due to eddy current loss is disposed at or near a position where the recording paper comes into contact with the recording paper when the recording paper is transferred by the rollers. Equipment fixing device. 2. The fixing device for an electrophotographic recording apparatus according to claim 1, wherein the alternating current magnetic field generating coil is provided outside the heating roller. 3. The fixing device for an electrophotographic recording apparatus according to claim 1, wherein the heating roller is hollow, and the alternating current magnetic field generating coil is provided inside the heating roller. 4. The fixing of an electrophotographic recording apparatus according to claim 1, wherein the rotating roller is hollow, and the alternating current magnetic field generating coil is provided inside the rotating roller so as to face the heating roller. Device. 5. The electrophotographic recording according to claim 1, characterized in that both the heating roller and the rotating roller are hollow, and the alternating current magnetic field generating coil is provided inside thereof facing each other. Equipment fixing device.