JP2003148454A - Rubber roller manufacturing method, rubber roller heating and adhering device, and rubber roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber roller with high productivity, a rubber roller manufacturing method efficiently and uniformly heating a boundary surface between a core material and a roller material and shortening a cooling time without extending a heating area to the surface of a roller, and a heating and a rubber roller adhering device using the rubber roller and the method. SOLUTION: This method of manufacturing the rubber roller having adhesive agent provided between the conductive core material and a rubber layer comprises the step of heating the core material by applying high frequency electromagnetic induction of a rather low range frequency to the core material to integrally form the core material with the rubber layer. The frequency is 50 to 300 kHz, a heated processing time by the electromagnetic induction is 0.5 to 5 s, and a peel strength between the inductive core material and the rubber layer is 0.1 N/mm<2> or more.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for integrally manufacturing a core material of a rubber roller used in an electrophotographic apparatus or the like and a roll material outside the core material, and a heating and bonding apparatus thereof, and
The present invention relates to a rubber roller formed thereby.

[0002]

2. Description of the Related Art In an electrophotographic apparatus such as a laser printer, a toner image is formed between a charging roller 2 for charging a photosensitive drum 1 and the photosensitive drum 1, and the toner image is formed on paper. Transfer roller 8 for transferring
Etc. These rubber rollers 12 are obtained by integrating a roll material containing resin or rubber on the outside of a round bar-shaped core material. Generally, for example, a roll material 1 such as a prismatic rubber or resin having a cylindrical hollow portion provided at the center thereof
A core material 15 made of a round bar-shaped metal material having a surface coated with a heat-melting type or thermosetting adhesive 14 is inserted into the hollow portion of 3 to form an oven (heating device) or the like. By heating, the adhesive 14 is melted and the core material 15 and the roll material 13 are welded,
It is cut into a cylindrical shape by various cutting devices. (Not shown)

By the way, it is necessary to use an oven with a large capacity or to put as many rubber rollers as possible in the oven. However, in the case of heat treatment, the uniformity of temperature in the oven is a problem, and It takes time to reach a predetermined temperature. In addition, there is a problem that the temperature varies greatly depending on the holding position of the roller, which causes variations in the product quality. Further, in the above-mentioned conventional heat welding method, since the entire roller is heated, there is a problem that it takes cooling time and productivity is low.

On the other hand, Japanese Patent Laid-Open No. 2001-20804
As described in No. 3, there is an invention of a roller manufacturing method and a heat welding apparatus for the roller, which can be processed in a short time by utilizing electromagnetic induction heating and realizes heat bonding of the roller without variations.

However, in the conventional method using electromagnetic induction, since only the surface of the core material is heated, the temperature is easier to cool than that in the oven, and the adhesive strength is smaller than that in the oven. There was a problem that it would end up.

[0006]

In view of the above problems, the present invention is to solve these problems by efficiently and uniformly heating the interface between the core metal and the roll material, and (EN) A method for producing a highly productive rubber roller which has a reduced cooling time without reaching the roller surface, and a heating and bonding apparatus which embodies the method. The present invention also provides a rubber roller formed by this.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a rubber roller in which an adhesive is interposed between a conductive core material and a rubber layer, the core material having a frequency in a relatively low region. This is achieved by a method of manufacturing a rubber roller, characterized by heating by applying high frequency electromagnetic induction to integrate the core material and the rubber layer.

At this time, the frequency of heating by electromagnetic induction is 5
The manufacturing method becomes more excellent because it is 0 kHz to 300 kHz and the heat treatment time by the electromagnetic induction is 0.5 s to 5 s.

The peel strength between the rubber core and the conductive core material of the rubber roller manufactured by the above method is 0.1 N / mm.
^An excellent rubber roller that is ² or more is supplied.

The apparatus of the present invention includes a heating means having an electromagnetic induction heating coil, a power supply for supplying a high frequency current to the electromagnetic induction heating coil, and a rubber roller for feeding a rubber roller to a near edge of the electromagnetic induction heating coil. And a heat-bonding device.

At this time, when the distance between the electromagnetic induction heating coil and the surface of the rubber roller is 1 mm to 200 mm, the heat treatment works more effectively.

Also, the electromagnetic induction heating coil has a wire diameter of φ.
A copper wire of 3 mm to 10 mm formed in a spiral shape is used as a flat mold having two stages in a plane parallel to the moving axis of the rubber roller,
Alternatively, the object of the present invention is achieved by a heating and bonding apparatus having a semicircular cross section orthogonal to the moving axis of the rubber roller.

Further, the conveying means receives the conductive core material to move its position, and the conveying means passes through the inside of the two-stage flat coil, or the rubber roller is The object of the present invention is achieved by a heat-bonding device having a means for moving the rubber roller inside the coil when reaching the position of the semicircular coil.

The receiving portion of the conveying means of the rubber roller is made of an insulating material.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.

FIG. 1 shows an example in which the conductive roller according to the present invention is used in an image forming apparatus. The image forming apparatus shown in the figure is an electrophotographic laser printer using a process cartridge, and the figure is a longitudinal sectional view showing the schematic configuration thereof. A transfer device having a transfer roller is attached to the image forming apparatus shown in FIG.

The image forming apparatus shown in FIG. 1 includes a drum type electrophotographic photosensitive member (hereinafter referred to as "photosensitive drum") 1 as an image bearing member. The photosensitive drum 1 is rotationally driven in the direction of arrow R1 by a driving means (not shown) at a predetermined process speed (peripheral speed), for example, 50 mm / sec.

The surface of the photosensitive drum 1 is uniformly charged by the charging roller 2 as a contact charging member. The charging roller 2 is disposed in contact with the surface of the photosensitive drum 1, and is driven to rotate as the photosensitive drum 1 rotates in the arrow R1 direction. An oscillating voltage (AC voltage V _AC ) is applied to the charging roller 2 by a charging bias applying power source (high voltage power source) (not shown).
+ DC voltage V _DC ) is applied, whereby the photosensitive drum 1
Is uniformly charged to −600 V (dark portion potential V _d ). The surface of the photosensitive drum 1 after charging is the laser light 5 output from the laser scanner 3 and reflected by the mirror 4, that is, the laser light 5 modulated corresponding to the time series electric digital image signal of the target image information. Receives scanning exposure. As a result, on the surface of the photosensitive drum 1, an electrostatic latent image (bright portion V
_l = -150V) is formed.

The electrostatic latent image is negatively charged by the developing bias applied to the developing roller 7 of the developing device 6, and negatively charged toner is attached to the electrostatic latent image, which is reversely developed as a toner image.

On the other hand, a transfer material 9 such as paper fed from a paper feeding portion (not shown) is guided by a transfer guide, and a transfer portion (transfer nip portion) between the photosensitive drum 1 and the transfer roller 8 is formed. To the toner image on the photosensitive drum 1 at the same time. The toner image on the photosensitive drum 1 is transferred onto the surface of the transfer material 9 supplied to the transfer portion by the transfer bias applied to the transfer roller 8 by the transfer bias applying power source (not shown). At this time, the toner (residual toner) remaining on the surface of the photosensitive drum 1 without being transferred to the transfer material 9 is removed by the cleaning device 10.

The transfer material 9 that has passed through the transfer portion is the photosensitive drum 1
The toner image is separated by the fixing roller 11 and is discharged to the outside of the image forming apparatus main body (not shown) as an image formed product (print).

It is essential that the conductive roller used as the charging roller 2, the transfer roller 8 and the like rotates integrally with the core material and the rubber or resin portion for the purpose of uniform charging, paper conveyance and the like. It is required to satisfy a rotation torque that exceeds a certain limit.

The method for manufacturing the rubber roller of the present invention and the embodied manufacturing apparatus will be described below.

2 and 3 are schematic views showing a roller manufacturing method and a heat welding apparatus according to the present embodiment.

In each figure, 12 is a rubber roller as a work, 16 is a means for conveying the rubber roller 12,
Reference numerals 18 and 19 denote the electromagnetic induction heating coils provided on the conveyance path of the conveying means 16 and the electromagnetic induction heating coils 18 and 1.
Coil power supply 21 for supplying a predetermined high frequency current to 9
In the induction heating device 17 provided with, the electromagnetic induction heating coils 18 and 19 are configured by forming a copper wire having a wire diameter of about 6 mm in a spiral shape. The rubber roller 12 is gripped by the core metal receiving portion and is conveyed at a predetermined speed.
In FIG. 2, the belt conveyor 16 passes between the structures formed by the flat electromagnetic induction heating coil 18. Also, FIG.
In the above, the rubber roller 12 is inserted into the semi-circular electromagnetic induction heating coil 19 by the roller push-up part (moving means) 20.
Is set.

By the induction heating device and the coil power source 20, a high frequency current having a frequency in a relatively low region is applied to the electromagnetic induction heating coils 18 and 19, and an alternating current having the above frequency is applied inside the electromagnetic induction heating coils 18 and 19. By generating a magnetic field, an eddy current due to electromagnetic induction is generated in the core material 15 of the rubber roller 12 placed in the AC magnetic field to raise the temperature of the conductor (induction heating). It should be noted that the magnitude of the AC magnetic field is determined by the electromagnetic induction heating coil 1
It has been reported that in the case of a structure in which a rubber roller is passed through or set inside 8 and 19, it is substantially constant, and it is rapidly attenuated outside the electromagnetic induction heating coils 18 and 19.

In the construction of the present invention, a rubber roller is formed by spirally forming a copper wire having a wire diameter of φ3 mm to 10 mm, and is a flat type electromagnetic composed of two surfaces parallel to the moving axis of the rubber roller. It must be passed between induction heating coils or set inside a coil having a semicircular cross section that is orthogonal to the axis of movement of the rubber roller, and must pass through the coil ring. Is something that does not. In the case of the configuration of the present invention, although it does not pass through the inside of the coil loop as in the prior art, as a result of examining the structure of the induction heating coil, effective conditions have been obtained.

According to the present invention, the frequency of the electromagnetic induction heating is 50 kHz to 30 which is a relatively low range frequency because of its configuration.
Although 0 kHz is adopted, at the lower limit of the range, there is a concern that heating efficiency will deteriorate because it takes time to raise the temperature, or the device output must be increased to compensate for it, and above the upper limit. Then, since only the surface of the core material was heated, there was a concern that the adhesive strength would be reduced.

The rubber roller 12 uses a conductive material for the core material 15, and has a round bar shape with an outer diameter of 4 to 15 mm. As a material of the roll material 13 to be bonded onto the core metal, a material having NBR, EPDM or the like as a main material and exhibiting conductivity or being added by blending carbon or the like as a conductive material is used. On the core material 15 corresponding to the rubber roller, if strong adhesion is required, a heat-melting type, for example, a styrene-based resin, or a thermosetting type, an epoxy-based resin or the like is used. Apply the adhesive 14 and leave it in a dry state at room temperature.
Insert 3 and heat.

In the present invention, a rubber roller having a round shape is used. That is, a rubber material extruded into a cylindrical shape is cut into a desired length and inserted into a cored bar. At this stage, the adhesiveness cannot be obtained, and therefore the means of the present invention is taken.

That is, as shown in FIG. 4, a roll material 13 made of an elastic material containing a cylindrical resin or rubber and having a cylindrical hollow portion in the center thereof, and heat inserted into the hollow portion. It is composed of a core material 15 made of a conductor coated with a melting type adhesive 14. When the rubber roller 12 is positioned in the electromagnetic induction heating coils 18 and 19, the roll material 13 and the adhesive agent 14 having high specific resistance are not affected by the AC magnetic field and only the temperature of the core material 15 which is a conductor. It rises sharply by induction heating.

When the temperature of the core material 15 rises, the core material 1
The temperature of the adhesive 14 coated on the surface of No. 5 rises. Then, the core material 15 and the roll material 13 can be bonded to each other by melting the adhesive agent 14 by heating and then solidifying or reacting with the roll material 13. Since the roll material 13 has a low thermal conductivity,
Even if the temperature of the core material 15 rises, the temperature rise of the core material 15 is small. That is, by positioning the rubber roller 12 in the electromagnetic induction heating coils 18 and 19, the roll material 13
Core material 15 and roll material 1 without unnecessarily raising the temperature of
And 3 can be bonded. Further, since the receiving portion of the cored bar in the conveying means is an insulator, the receiving portion is not unnecessarily heated for the same reason as above.

(Description of Device Configuration) In this embodiment, as shown in FIGS. 2 and 3, the rubber roller 12 is conveyed at a predetermined speed by the belt conveyor 16 and passes through the flat electromagnetic induction heating coil 18. The temperature of the core material 15, which is a conductor, is raised only during a period of time during which the high-frequency electromagnetic wave is irradiated inside the semicircular electromagnetic induction heating coil 19, and the adhesive 14 coated on the surface of the core material 15 is increased. Is melted by heating or cured by heating, and the core material 15 and the roll material 13 are bonded to each other. When the rubber roller 12 is conveyed to the outside after passing through the electromagnetic induction heating coil 18,
Since the AC magnetic field is rapidly reduced, the core material 15 is not heated and the rubber roller 12 is naturally cooled during the transportation.

The temperature rise value (heating temperature) and the heating time of the core material 15 are determined by the electromagnetic induction heating coils 18 and 19.
Current value flowing in the coil and the belt conveyor 16 in the coil 18
It is determined by the conveyance speed of the above, or the irradiation time of the high frequency in the coil 19. Therefore, the heating conditions (heating temperature and heating time) of the core material 15 can be appropriately set by adjusting the current value and the transport speed or the high frequency irradiation time. In induction heating,
Since only the core material 15 is heated, the cooling rate can be reduced as compared with the conventional method of heating the entire rubber roller 12.

The wire diameter of the coil has a diameter of 3 mm to 10 mm in the structure of the present invention because of problems in coil forming and usage durability.
Is desirable.

[0036]

EXAMPLES (Evaluation of Results, Description of Evaluation Means, etc.) Table 1 shows an example of test results for obtaining efficient heating conditions (apparatus frequency, distance from roller surface to coil, heating time). Is. The optimum use temperature of the used adhesive is known to be 140 ° C. to 180 ° C. from an experiment using an oven, and the conditions for efficiently heating within the optimum use temperature range will be examined.

The test after the above heat treatment is usually carried out after the outer diameter of the roll material 13 is ground into a cylindrical shape, and the peeling strength between the core material 15 and the roll material 13 and the outer diameter (the accuracy of the roller diameter after grinding). ) And runout (core misalignment), and the roll material 13 and the core material 1
Check the specific resistance between 5 respectively. When the device frequency is high, the peel strength tends to be smaller than when the frequency is low even if the heating temperature is the same. Further, the closer the coil is to the surface of the roller, the faster the heating can be performed to a high temperature, and the result is that the peel strength is not influenced by the speed of temperature rise. By shortening the distance between the coil and the roller to improve heating efficiency and heating the core material in a short time, the temperature of the core material is maintained by irradiating the core material with a high frequency of a relatively low frequency, and a strong adhesive strength is obtained. can get.

The peel strength is measured by using a test piece in a state in which the rubber or resin portion is left on the core material by 5 mm × 100 mm and the other rubber portion or resin portion is removed. Pull up the rubber part or resin part of the test piece in the direction perpendicular to the core using a spring balance.
The peel strength of the roller was defined as the value of the spring at the time when it began to peel from the core material. (Measurement means not shown)

In the structure of the present invention, the peel strength between the conductive core material of the rubber roller and the rubber layer is 0.1 N / mm ^2.
As above, the constitution of the comparative example which does not correspond could not obtain the peel strength equivalent to that of the oven.

In Table 1, the constitutions of Examples and Comparative Examples and the results thereof are summarized and shown. The test results of the outer diameter accuracy, runout, and resistance value are shown by “◯”. This indicates that it can be used as a rubber roller.

[0041]

As described above, by using a high frequency wave having a frequency in a relatively low region, it is possible to heat the core material from the inner side and make the adhesive strength equal to or higher than that of the oven.

Further, by improving the conveying method and the coil shape, the distance between the core material and the coil can be shortened, the heating efficiency of the core material can be increased, the temperature rising speed of the core material can be increased, and the core material can be heated in a shorter time. Allowed heating.

Utilizing a high frequency in a relatively low region,
With the realization of a conveyance method in which the coil and the core material are brought closer to each other, it is possible to provide a manufacturing method for obtaining a rubber roller having a strong adhesive strength in a shorter time, and a heating and bonding apparatus for the same.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a laser printer.

FIG. 2 is a schematic view showing a method for manufacturing a rubber roller and a heat welding apparatus according to the present embodiment.

FIG. 3 is a schematic view showing a method for manufacturing a rubber roller and a heat welding apparatus according to the present embodiment.

FIG. 4 is a diagram showing a configuration of a rubber roller.

[Explanation of symbols]

1 ... Photosensitive drum 2 ... Charging roller 3 ... Laser scanner 4 ... Mirror 5 ... Laser light 6 ... Developer 7 ... Developing roller 8 ... Transfer roller 9 ... Transfer material 10 ... Cleaning device 11 ... Fixing roller 12 ... Rubber roller 13: Roll material 14 ... Adhesive 15: Core material 16 ... Conveying means / belt conveyor 17 ... Induction heating device 18: Flat electromagnetic induction heating coil 19 ... Semicircular electromagnetic induction heating coil 20 ... Roller push-up part 21 ... Coil power supply

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03G 15/02 101 G03G 15/02 101 15/16 103 15/16 103 // H05B 6/10 341 H05B 6 / 10 341 B29L 31:32 B29L 31:32 (72) Inventor Erika Umeki 1888-2 Kukizaki, Kashizaki-cho, Inashiki-gun, Ibaraki Prefecture In Canon Inc. (72) Inventor Makoto Chiba, Kashizaki-cho, Inashiki-gun, Ibaraki Prefecture 1888- 2 F-terms within Canon Chemical Co., Ltd. (reference) 2H071 BA43 DA06 DA09 2H200 FA13 GA23 GA34 GA44 GA59 GB12 GB22 GB25 HA02 HA28 HB12 HB22 HB45 HB46 HB47 JA02 JA25 JA26 JA27 LC08 LC09 MA03 MA06 MA20 MB01 MC03 3J103 AA02 A32 AA31 AA21 AA13 A41 AA21 AA13 AA21 CA16 CA62 CA78 EA02 EA07 EA11 EA12 FA15 GA02 GA58 GA74 HA03 HA05 HA12 HA15 HA20 HA31 HA41 HA52 HA53 3K059 AA08 AB25 AB27 AD03 CD7 5 4F211 AA44 AD03 AD05 AH04 AH33 AR11 SC01 SD04 SJ11 SP30 TA09 TC07 TD18 TJ11 TN16

Claims (11)

[Claims] 1. A method for manufacturing a rubber roller in which an adhesive is interposed between a conductive core material and a rubber layer, wherein the core material is heated by applying high frequency electromagnetic induction of a frequency in a relatively low region, A method of manufacturing a rubber roller, characterized in that the core material and the rubber layer are integrated. 2. The frequency is 50 kHz to 300 kHz
The method for manufacturing a rubber roller according to claim 1, wherein 3. The heat treatment time by the electromagnetic induction is 0.5.
The method for producing a rubber roller according to claim 1, wherein the rubber roller has a length of 5 seconds to 5 seconds. 4. The peel strength between the conductive core material of the rubber roller and the rubber layer, which is manufactured by the manufacturing method according to claim 1, is 0.1 N / mm ² or more. Rubber roller characterized by. 5. A heating means having an electromagnetic induction heating coil, a power supply for supplying a high frequency current to the electromagnetic induction heating coil, and a conveying means for supplying a rubber roller to a near edge of the electromagnetic induction heating coil. A heat-bonding device for rubber rollers, which is characterized in that 6. The heat-bonding device according to claim 5, wherein the distance between the electromagnetic induction heating coil and the rubber surface of the rubber roller is 1 mm to 200 mm. 7. The electromagnetic induction heating coil has a wire diameter of 3 m.
A copper wire of m to 10 mm formed in a spiral shape is formed into a two-stage flat shape in a plane parallel to the moving axis of the rubber roller, or a semicircular cross section orthogonal to the moving axis of the rubber roller. It is formed, The heat-bonding apparatus of Claim 5 or 6 characterized by the above-mentioned. 8. The heat-bonding device according to claim 5, wherein the conveying means receives the conductive core material and moves its position. 9. The transport means passes through the inside of a two-stage flat coil.
The heating and bonding apparatus according to any one of 1. 10. The transporting means has means for moving the rubber roller inside the coil when the rubber roller reaches the position of the coil. The heat-bonding device according to claim 1. 11. The heat-bonding device according to claim 5, wherein the receiving portion of the conveying means is made of an insulating material.