JP3472978B2 - High and low voltage dual use type quick heat roller and device using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat roller for fixing a developer (toner) in an electrophotographic apparatus such as a copying machine or a printer. More specifically, it is possible to rapidly heat a heating resistor by controlling energization heating. In addition, the present invention relates to a high- and low-voltage power supply dual-use quick heat roller that can be used for both 100 V power supply and 200 V power supply with the same heat roller.

[0002]

2. Description of the Related Art Generally, in a toner fixing device in an electrophotographic apparatus such as a copying machine or a printer, a heat roller having a heat generating means and a pressure roller are arranged to face each other, and a toner image is formed between these rollers. The transferred recording paper is passed through and pressed simultaneously with heating to thermally fix the toner image on the recording paper. Further, what has been put into practical use as a heat roller is a metal pipe made of aluminum, stainless steel, or the like, in which a halogen lamp is installed as an emission heating tube.

FIG. 14 shows an example of a halogen lamp. The halogen lamp 40 is configured by enclosing a coiled tungsten filament 42 together with an enclosing gas in a quartz glass body 44, and electrode terminals 48, 48 at both ends are provided so as to protrude through molybdenum foils 46, 46. The filling gas is a mixed gas obtained by adding a trace amount of a halogen substance to an inert gas.

FIG. 15 is a block diagram showing a conventional fixing system. The heat roller 2 and the pressure roller PR are arranged in pressure contact with each other, and the paper P on which the toner image TI is formed is run between them, and the heat of the heat roller 2 and the pressure of the pressure roller PR squeeze the toner to penetrate the paper. And fixed to complete the fixed image PI.

The heat roller 2 is provided with a Teflon rubber 50 as a peeling material on the outer periphery of a cylindrical body 4 made of aluminum.
A halogen lamp 40 is axially arranged inside the cylindrical body 4. When the halogen lamp 40 is energized, infrared rays are emitted to radiatively heat the cylindrical body 40, and the heat roller 2
The whole is heated to a predetermined temperature.

[0006]

However, the heat roller of the light emission heating tube system has a low heat generation efficiency because it uses radiant heat, and for example, it takes several minutes to a dozen minutes to raise the fixing temperature to 160 ° C. Was needed. In particular, at present, when the information communication device and the copying machine are integrated, it is necessary to shorten the time from the acquisition of information to the start of copying within 10 seconds in the standby state.

To solve this problem, the present inventors have filed Japanese Patent Application Nos. 10-254487 and 10-25448.
No. 8 and Japanese Patent Application No. 10-255936, a heating resistor type heat roller (hereinafter, also referred to as a quick heat roller) was proposed. Rapid heating is realized by forming a film of a heating resistor layer on the peripheral surface of the cylindrical body and heating it with current. Since the current heating method has high heating efficiency,
Enables high-speed interlocking between copiers and information and communication equipment.

The next problem arises from the fact that the power supply voltage is different for each country. Worldwide, there are two types of power supply voltage, 100V and 200V. Japan has 100V, while Europe and America use 200V as a standard. The 100V power source and the 200V power source referred to here are concepts that do not refer to exact numerical values but include some numerical variations. For example, even if it says 200V power supply, it may be 2 depending on the country.
It may be 20V or 240V and is considered as a term that includes these variations. However, in the following calculation, 100V,
A value of 200V is used.

Normally, in order to convert electronic equipment between 100V and 200V, 200V is changed to 100V or 1
It is necessary to separately install a transformer that transforms 00V to 200V. However, the transformer is heavy and expensive at the same time, which increases the price of the entire electronic device. If a diversion transformer is not installed separately, it is necessary to replace the transformer that is integrated into the main body.
You have to prepare two types for. In this case, the complication of providing two kinds of products for domestic and export is involved.

The luminescence heating tube type heat roller has the following problems in addition to the transformer problem. When lighting the light emitting heating tube, a large inrush current flows at the moment of lighting. This rush current varies depending on the power source impedance, but reaches 7 to 10 times the rated current. In order to suppress this inrush current, various lighting systems such as zero-cross lighting and protection circuits have been developed.

As described above, when the 200 V heat roller is diverted for 100 V using a transformer,
Even if the voltage can be reduced from 200V to 100V, the current is increased to double and the inrush current is unavoidably increased. Therefore, the heating tube itself for 100V and 200V
It is a common practice to prepare two types of products. In other words, two types of light-emitting heating tubes having a 100V characteristic and a 200V characteristic must always be prepared, which imposes a heavy burden on the halogen lamp manufacturer.

The heating resistor type heat roller has been developed in recent years by the present inventors, and is currently 10
It is only the stage when the 0V heat roller is completed. However, development for 200V is an urgent task, and it is a great burden to prepare two types of quick heat rollers as in the case of the emission heating tube system. That is, it is required to develop a method for easily using the same quick heat roller for 100V and 200V.

Therefore, a first object of the present invention is to provide a quick heat roller which can be used for both 100V and 200V. A second object of the present invention is to provide a quick heat roller device which can be used for both 100V and 200V only by changing the connection method of the power supply circuit without using a transformer.

[0014]

According to a first aspect of the present invention, a fixing quick heat is provided in which a heating resistor layer formed on an inner peripheral surface or an outer peripheral surface of a cylindrical body is electrically heated to set the cylindrical body to a desired temperature. In the roller, the heating resistor layer is formed by arranging two semi-cylindrical heating resistor layers facing each other, and a slit is placed between the longitudinal side edges of the two semi-cylindrical heating resistor layers. And a semi-cylindrical heating resistor layer are insulated from each other.

According to a second aspect of the present invention, a power circuit is connected to the high and low voltage power source type quick heat roller according to the first aspect, and two semi-cylindrical heating resistor layers are connected in parallel when a 100 V power source is connected. In the case of connecting a 200V power source, two semi-cylindrical heating resistor layers are connected in series.

According to a third aspect of the present invention, a quick heat roller for both high and low voltage power supplies is arranged in pressure contact with a pressure roller, and a sheet is sandwiched between these rollers and run to heat-fix the toner. It is a high- and low-voltage power supply dual-use type quick heat roller device.

According to a fourth aspect of the invention, a fixing belt is wound around the outer periphery of a roller group including a high and low voltage power supply type quick heat roller, and the fixing belt is heated to a predetermined temperature by the high and low voltage power supply type quick heat roller. 3. The high and low voltage power dual-use type quick heat roller device according to claim 2, wherein the toner is heat-fixed by setting and setting the paper to run between the fixing belt and the pressure roller.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The inventors of the present invention have earnestly studied to make a quick heat roller a dual-purpose type for a 100 V power source and a 200 V power source. As a result, the heating resistor film formed on the circumferential surface of a cylindrical body is equal to two. I came to discover that it can be easily made into a dual-purpose type by dividing it. Hereinafter, an embodiment of a high-and-low-voltage power supply type quick heat roller according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a first embodiment of a high and low voltage power source type quick heat roller. The quick heat roller 2 is configured by forming two heat generating resistor films 6 on the outer peripheral surface of a cylindrical body 4 made of a metal such as aluminum or stainless steel. Slits 8 are formed along the entire axial length between the side edges of the heating resistor films 6, 6 in the axial direction. These slits 8 and 8 are regions where the heating resistor film is not formed, and the two heating resistor films 6 and 6 are electrically insulated by this slit.

FIG. 2 is a sectional view taken along the line II of FIG. Figure 2
From this, it can be seen that the slits 8, 8 are recessed. However, an insulating material may be applied to these slits 8 and 8 so that the surfaces of the heating resistor films 6 and 6 are flush with each other. When they are flush with each other, when the sheets are sandwiched by the quick heat roller 2, the lines of the side edges of the slits 8 are not formed on the sheet.

FIG. 3 is a cross-sectional view of a first embodiment of a high / low voltage power supply type quick heat roller device according to the present invention, and is equipped with a power supply circuit of 100 V AC and is taken along line II-I of FIG.
It is also a sectional view taken along line I. Explaining from the external configuration of the cylindrical body 4, the heating resistor films 6 and 6 are composed of five layers, and the heat insulating layer 10, the insulating layer 12, and the heating resistor layer 1 are arranged from the side closer to the cylindrical body 4.
4, the insulator layer 16 and the metal sheet 18.
Electrode layers 14a and 14b are formed on both ends of the heating resistor layer 6, and conductive rings 10a and 10b are formed on both ends of the heat insulating layer 10.
Are placed. Electrode layers 14a and 14b and conductive ring 10
a and 10b are in contact with each other and are in conduction.

The heating resistor layer 14 is a layer which generates heat when an electric current is applied. The heating resistor layer 14 is formed by coating a conductive paste made of metal powder, carbon powder or the like, or has a predetermined electric resistance value. It is formed by stretching the resistive film that it has. The resistance value can be changed by adjusting the thickness and selecting the conductive material, and the heat generation power can be adjusted freely.

As the heating resistance material, not only a conductive agent but also a mixture of synthetic resin or glass forming a matrix may be used. In addition, other known materials may be added depending on the purpose. Examples of the conductive agent include metallic materials such as Ag, Ni, Au, Pd, Mo, Mn, and W, or Re ₂ O ₃ , Mn ₂ O ₃ , and LaMnO _3.
And the like intermetallic compound is used. Further, by using the glass forming the matrix, it is possible to reduce the change in the resistance value even in the heating / cooling cycle.

The insulating layers 12 and 16 insulate the current from the heating resistor layer 14, and are formed by coating a coating of insulating powder or stretching an insulating film. The insulating material is divided into an inorganic insulating material and an organic insulating material. Inorganic insulating materials include mica, marble, ceramics, glass, etc., and organic insulating materials include various known materials such as fibers, plastics, rubbers, waxes, compounds, etc.
It may be properly used depending on the processing performance. For example, plastics and the like can be used as an insulating material because they can be easily formed into a layer having an extremely flat surface. For example, polyimide resin can be used as a high temperature insulating material.

A heat insulating layer 1 is provided on the cylindrical body side of the heating resistor layer 14.
Since 0 is arranged, the heat generated in the heating resistance resistor layer 14 is blocked from being conducted to the cylindrical body, and the metal sheet 18 is efficiently heated.

There are two methods for forming the heating resistor film 6. The first is a method in which each layer is applied to the outer peripheral surface of the cylindrical body 4 and dried, and the heating resistor film 6 is completed by repeating this process. The second is a method in which a heating resistor film sheet in which each layer is sequentially formed is prepared and the heating resistor sheet is attached to the outer peripheral surface of the cylindrical body 4. It is also possible to combine these two methods. In the first embodiment, the method of coating and forming on the outer peripheral surface was selected.

At both ends inside the cylindrical body 4, insulating rings 20 are provided.
Introducing terminals 22a and 22b are provided via a and 20b. The conductive ring 10a and the lead-in terminal 22a are connected to the conductive wire 24a.
Conductive connection by means of the conductive ring 10b and the introduction terminal 22.
Conductive connection is made with b by a conductive wire 24b. Introduction terminal 22
A heating power supply 26 of AC 100V is connected to a and 22b to form a power supply circuit.

FIG. 4 is an equivalent circuit diagram of FIG. As is clear from FIGS. 3 and 4, the upper and lower heating resistor layers 14,
Both ends of 14 are electrically connected by the introduction terminals 22a and 22b, so that they are parallel circuits. AC 100V is applied to both ends of this parallel resistance circuit. When the resistance value of the heating resistor layer 14 is R, one heating resistor layer 1
Since the heat generation power in No. 4 is 100 ² / R, the total heat generation power is twice that, 20000 / R.

FIG. 5 is a cross-sectional view of a second embodiment of a high-and-low-voltage power supply type quick heat roller device according to the present invention, and is a II-I of FIG. 1 provided with a power supply circuit of 200 V AC.
It is also a sectional view taken along line I. The same parts as those in FIG. 3 are denoted by the same reference numerals, and different parts will be described below. An application terminal 28 is provided instead of the introduction terminal 22b. As shown in FIG. 6, which is a partially enlarged view of FIG. 5, the applying terminal 28 is configured by sandwiching an insulator 28c between applying electrodes 28a and 28b.

A heating power source 26 is connected to the applying electrodes 28a and 28b to form a power source circuit, and an alternating current of 200 V is applied to both electrodes. The left ends of the heating resistor layers 14 and 14 are electrically connected to each other by the introduction terminal 22a, and the heating resistor layer 1
The right ends of 4 and 14 are connected to the application electrodes 28a and 28b. Therefore, the heating resistor layers 14, 14 are connected in series, and a voltage of AC 200V is applied.

FIG. 7 is an equivalent circuit diagram of FIG. This equivalent circuit is a series resistance circuit of two heating resistor layers 14, 14. AC 200 V is applied to both ends of this series resistance circuit. When the resistance value of the heating resistor layer 14 is R, the combined resistance is 2R and the total heating power is 200 ² / 2R, that is, 20000 / R. Of course, one heating resistor layer 1
The heat generation power of No. 4 is 10000 / R, which is 1/2 of that.

100V parallel circuit of FIG. 4 and 200V of FIG.
Comparing the series circuits, the heating power of each heating resistor layer 14 is 10,000 / R, and the total heating power is 20000 / R, which gives exactly the same result. This means that 100 V or 200 V can be supported by exchanging the connection method and the power supply circuit using exactly the same quick heat roller. In other words, the same quick heat roller can be used for both domestic and export purposes to achieve the same heat generation fixing function.

As mentioned above, a 100V power supply and 20
Since the 0V power source is a concept including numerical variations, the 100V parallel circuit and the 200V series circuit do not always have the same heat generation power due to variations in the voltage value, and may vary depending on the actual voltage value.

Further, in the case of a light emitting heating tube type heat roller such as a halogen lamp, due to the problems of inrush current and light emitting conditions,
It was necessary to develop emission heating tubes for 00V and 200V. On the other hand, according to the present invention, the same quick heat roller enables specifications of 100 V and 200 V only by changing the external circuit, which makes it possible to significantly reduce development costs and manufacturing / sales costs.

FIG. 8 is a perspective view of a second embodiment of a high-voltage and low-voltage power source type quick heat roller. The quick heat roller 2 is formed by forming two heating resistor films 6 having a semicircular cross section on the inner peripheral surface of a cylindrical body 4. The difference from FIG. 1 is only the difference between the outer peripheral surface and the inner peripheral surface. Slits 8 are formed along the entire axial length between the side edges of the heating resistor films 6, 6 in the axial direction. These slits 8 and 8 are regions where the heating resistor film is not formed.

FIG. 9 is a sectional view taken along line III-III in FIG. It can be seen from FIG. 9 that the slits 8, 8 are concave. An insulating material may be applied to these slits 8 and 8 so that the surfaces of the heating resistor films 6 and 6 are flush with each other. However, even if they are not flush with each other, since they are formed on the inner peripheral surface of the cylindrical body 4, they do not directly hit the paper and have no effect on the paper.

FIG. 10 shows the IV-I of FIG. 8 with the introduction terminal added.
It is a V line sectional view. A peeling layer 30 made of Teflon or the like is formed on the outer periphery of the cylindrical body 4 so that the fixed paper can be easily peeled from the quick heat roller 2. Heat generating resistor films 6, 6 are formed on the inner peripheral surface of the cylindrical body 4. Both ends of the heating resistor films 6 and 6 have conduction rings 3
It is electrically connected to the introduction terminals 22a and 22b via 2a and 32b.

In order to form the heating resistor film 6 on the inner peripheral surface of the cylindrical body 4, a method of sequentially applying each layer and forming a heating resistor film sheet, and then adhering this sheet to the inner peripheral surface. There is a way. In this embodiment, the method of forming the sheet was selected because of its ease of forming on the inner peripheral surface.

FIG. 11 is a sectional view of the heating resistor film sheet. A polyimide resin sheet is used as the insulator layer 12, and the heating resistor layer 14 and the insulator layer 16 are sequentially applied onto the polyimide resin sheet, and the metal sheet 18 is attached thereon. Electrode layers 14a and 14b are applied to both ends of the heating resistor layer 14. The heating resistor film sheet thus formed is attached to the inner peripheral surface of the cylindrical body 4 to form the heating resistor film 6.

FIG. 12 is a cross-sectional view of a third embodiment of a high / low voltage power supply type quick heat roller device according to the present invention. The quick heat roller 2 is configured by forming a heating resistor film 6 on the inner peripheral surface of a cylindrical body 4. When the quick heat roller 2 and the pressure roller PR are arranged in pressure contact with each other and these rollers are driven in the direction of arrow a, the paper P
Runs in the direction of arrow b. The toner image TI is the roller 4,
It is fixed by the heating / pressurizing action of PR, and a completed image PI is formed.

FIG. 13 is a cross-sectional view of a fourth embodiment of a high and low voltage power source type quick heat roller device according to the present invention. The quick heat roller 2 is formed by forming a heating resistor film 6 on the outer peripheral surface of a cylindrical body 4. A fixing belt BE is wound around the outer circumferences of the quick heat roller 2, the tension roller TR, and the drive roller DR. The pressure roller PR is arranged in pressure contact with the fixing belt BE.

When the drive roller DR is driven to rotate in the direction of arrow c, the tension roller TR and the quick heat roller 2 also rotate in the direction of arrow c, and the pressure roller PR arranged in pressure contact with the fixing belt BE moves in the direction of arrow d. Rotate. Through this rotation, the quick heat roller 2 heats the fixing belt BE to a predetermined fixing temperature. In this state, when the paper P is run in the direction of arrow e, the toner image TI
Is heated and fixed by the fixing belt to form a complete image PI.

In this embodiment, since the quick heat roller 2 heats the fixing belt BE, the influence of the slit 8 having a minute width, that is, the temperature unevenness hardly appears on the fixing belt BE. Since the sheet P is fixed by this fixing belt BE, uneven fixing due to uneven temperature hardly occurs.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications, design changes and the like within the technical scope of the present invention are included in the technical scope thereof. Absent.

[0045]

According to the first aspect of the present invention, the heating resistor layer formed on the inner peripheral surface or the outer peripheral surface of the cylindrical body is electrically heated to set the cylindrical body to a desired temperature. The life of the copying machine can be increased, the speed of the copying machine can be increased, and the information processing device and the copying machine can be linked. Further, since the two semi-cylindrical heating resistor layers, which are insulated from each other by the slits, are arranged so as to face each other, these two heating resistor layers can be connected in series or in parallel, and can correspond to the power supply voltage of each country.

According to claim 2, when a power circuit is connected to the high and low voltage power supply type quick heat roller, and when a 100V power supply is connected, two semi-cylindrical heating resistor layers are connected in parallel, and a 200V power supply is used. In case of connecting, since the two semi-cylindrical heating resistor layers are connected in series, the individual heating power and the total heating power are set to be almost the same within the range of the variation of the power supply voltage regardless of the power supply of 100V or 200V. it can. Therefore, the same quick heat roller can be used for domestic and export purposes, simplifying production and sales and reducing costs.

According to the third aspect of the present invention, the high-and-low-voltage power source type quick heat roller is arranged in pressure contact with the pressure roller, and the paper is nipped and run between these rollers to thermally fix the toner. By using the quick hit roller, it is possible to provide a high-voltage and low-voltage dual-use type quick heat roller device that is widely used in copying machines.

According to the present invention, the fixing belt is wound around the outer periphery of the roller group including the high and low voltage power supply type quick heat rollers, and the fixing belt is heated to a predetermined temperature by the high and low voltage power supply type quick heat rollers. Because the toner is heat-fixed by setting and running the paper between the fixing belt and the pressure roller, the effect of the slits on the quick heat roller can be eliminated, and fixing can be performed with a small pressing force, and excellent copying can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a high-and-low-voltage power source type quick heat roller.

FIG. 2 is a sectional view taken along the line II of FIG.

FIG. 3 is a cross-sectional view of a first embodiment of a high and low voltage power supply type quick heat roller device according to the present invention.

FIG. 4 is an equivalent circuit diagram of FIG.

FIG. 5 is a cross-sectional view of a second embodiment of a high- and low-voltage power supply dual-use quick heat roller device according to the present invention.

6 is a partially enlarged view of FIG.

FIG. 7 is an equivalent circuit diagram of FIG.

FIG. 8 is a perspective view of a second embodiment of a high and low voltage power source type quick heat roller.

9 is a sectional view taken along line III-III in FIG.

10 is a cross-sectional view taken along line IV-IV of FIG. 8 in which an introduction terminal is added.

FIG. 11 is a cross-sectional view of a heating resistor film sheet.

FIG. 12 is a cross-sectional view of a third embodiment of a high / low voltage power supply type quick heat roller device according to the present invention.

FIG. 13 is a cross-sectional view of a fourth embodiment of a high / low voltage power supply dual type quick heat roller device according to the present invention.

FIG. 14 is an example diagram of a conventional halogen lamp.

FIG. 15 is a configuration diagram showing a conventional fixing method.

[Explanation of symbols]

2 ... Quick heat roller 4 ... Cylindrical body 6 ... Heating resistor film 8 ... Slit 10 ... Insulation layer 10a / conductive ring 10b / conductive ring 12 .. Insulator layer 14 ... Heating resistor layer 14a / electrode layer 14b / electrode layer 16 ... Insulator layer 18 ... Metal sheet 20a / insulating ring 20b / insulating ring 22a / Introduction terminal 22b / Introduction terminal 24a conductor 24b / conductor 26 .. Heating power supply 28 ... Application terminal 28a / application electrode 28b / Applying electrode 28c / insulator 30..Peeling layer 32a / Conduction ring 32b, conduction ring 40 ... Halogen lamp 42 ... Tungsten filament 44..Quartz glass body 46 ... Molybdenum foil 48 ... Electrode terminals DR ・ ・ Drive roller P ... Paper PI ... Completion image PR ・ ・ Pressure roller TI ... toner image TR ・ ・ Tension roller

Front Page Continuation (72) Inventor Norio Yamamoto 2-7-19 Nishi, Nishi, Saito-ku, Osaka City, Osaka Prefecture Daiken Chemical Industry Co., Ltd. No. (56) References JP-A-53-20934 (JP, A) JP-A-5-324101 (JP, A) Actual development Sho-56-120560 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03G 13/20 G03G 15/20

Claims (3)

(57) [Claims] 1. An electric heating is applied to an inner peripheral surface or an outer peripheral surface of a cylindrical body.
Two semi-cylindrical heating resistors that are heated to a desired temperature
The body layers are arranged to face each other, and the two semi-cylindrical heating resistor layers are
Insulated from each other by providing a slit between the longitudinal side edges
In the fixing quick heat roller, the two front
The electric resistance of the semi-cylindrical heating resistor layer is set to be almost the same.
However, when connecting a 100V power supply, two semi-cylindrical
When connecting the thermal resistor layers in parallel and connecting a 200V power supply
Is connected in series with two semi-cylindrical heating resistor layers,
Two for both V and 200V power supplies
The heating power in each of the semi-cylindrical heating resistor layers of
High- and low-voltage power supply dual type quies characterized by the same setting
Heat roller. 2. A high and low voltage power source dual type quill according to claim 1.
The heat roller is placed in pressure contact with the pressure roller.
Place the paper and run the paper in a narrow space between these rollers.
High- and low-voltage power supply dual type quick heat low
Ra device. 3. A high / low voltage power source dual type quill according to claim 1.
Fixing roller on the outer circumference of the roller group including the heat roller.
High- and low-voltage power supply dual-use quick heat roller
To set the fixing belt to a predetermined temperature and fix it.
Heat the toner by running the paper between the belt and the pressure roller.
High- and low-voltage power supply dual type quick heat roller device to fix
Place