JPH11272106A - Fixing device and image forming device installed with the device - Google Patents

Fixing device and image forming device installed with the device

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Publication number
JPH11272106A
JPH11272106A JP7212898A JP7212898A JPH11272106A JP H11272106 A JPH11272106 A JP H11272106A JP 7212898 A JP7212898 A JP 7212898A JP 7212898 A JP7212898 A JP 7212898A JP H11272106 A JPH11272106 A JP H11272106A
Authority
JP
Japan
Prior art keywords
fixing
fiber sheet
shaft
resistance value
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7212898A
Other languages
Japanese (ja)
Inventor
Shunichi Hashimoto
Hidehiko Inoguchi
Tetsuya Mitsuyasu
Hiroyuki Noda
Tadafumi Shimizu
Junichi Terayama
Hisaaki Yonekura
哲也 光安
純一 寺山
忠文 志水
俊一 橋本
英彦 猪口
久晶 米倉
宏之 野田
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP7212898A priority Critical patent/JPH11272106A/en
Publication of JPH11272106A publication Critical patent/JPH11272106A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Problem] To provide a fixing device capable of winding a fiber sheet at a constant speed and discriminating between use and non-use, and an image forming apparatus to which the fixing device is attached. SOLUTION: A wave unit 103 provided with a fixing roller and a fiber sheet wound around a second shaft after supplying the impregnated release agent to the surface of the fixing roller.
Determining means 104 having a predetermined resistance value and changing the resistance value when the replaced wave unit 103 processes a predetermined number of printed sheets; and a resistance value of the changed determination means 104 having a resistance value before the change. When the value returns to the value, the outer diameter of the roll of the fibrous sheet wound on the second shaft is determined again, and the second outer diameter of the fibrous sheet is wound at a constant speed based on the outer diameter of the roll. A CPU 107 for controlling the rotational angular velocity of the shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device and an image forming apparatus to which the fixing device is attached, and more particularly to a fiber sheet provided in the fixing device and supplying a release agent to the surface of a fixing roller.

[0002]

2. Description of the Related Art In a conventional fixing device of an electrophotographic image forming apparatus, various techniques for applying a release agent such as silicone oil to a fixing roll to prevent toner offset have been adopted. In particular, in a full-color image forming apparatus in which a plurality of different color toners are mixed, the fixing roll requires a very high releasability, so that a large amount of the releasing agent is applied to the fixing roll.

[0003] Heretofore, the conventional supply of the release agent has mainly been such that a roll or the like impregnated with a release agent such as silicone oil is directly pressed against the surface of the fixing roll. However, in such an impregnated roll system, there is a problem that the supply amount of the release agent varies with the passage of time and the offset effect is not maintained for a long time.

[0004] In order to solve this problem,
There has been proposed a sheet-type release agent supply structure in which a fiber sheet impregnated with a release agent is wound up while being brought into contact with a fixing roll.

Next, an image forming apparatus using a fixing device having a conventional sheet type release agent supply structure will be described.

The toner of each color of black (B), cyan (C), magenta (M), and yellow (Y) is stored along the outer peripheral surface of the photosensitive belt which is coated with the photosensitive receiving layer and rotates. A developing device and a charger for charging the photoreceptor belt by corona discharge are provided. In addition, a semiconductor laser element is built in, and a laser beam is applied to the photoreceptor belt while switching between laser emission and extinguishing according to image data to form an electrostatic latent image.
(Ning Unit). Further, an intermediate transfer belt on which the toner image on the photoconductor belt is transferred is provided opposite to the photoconductor belt.

A paper transport path is formed so as to come into contact with the rotating intermediate transfer belt, and the toner image formed on the intermediate transfer belt is transferred to the paper transported on the paper transport path. You.

A fixing device is provided downstream of the sheet transport path, and the unfixed toner image transferred to the sheet is heated and pressed by the fixing device.

Here, the structure of a fixing device for fixing a toner image on a sheet will be described. FIG. 7 is a schematic diagram showing the structure of a fixing device in a conventional image forming apparatus.

In this fixing device, as shown in FIG. 7, the surface temperature is adjusted to an optimum fixing temperature (16 ° C.) by an internal or external heat source.
(0 ° C. to 180 ° C.), a pressure roller 209 which is provided in a pair with the fixing roller 8 and holds the conveyed unfixed toner image together with the sheet, There is provided a release agent applying means, that is, a wave unit 10 for applying silicone oil as a release agent to the roller 8 and cleaning the surface of the fixing roller 8 after the fixing operation is completed.

The wave unit 10 applies a release agent to the surface of the first shaft 12a around which the fiber sheet 11 impregnated with a release agent such as silicone oil is wound and the surface of the fixing roller 8, and cleans the surface. Second shaft 12b for winding used fiber sheet 11
And a friction plate 13 pressed against the outer peripheral surface of the unused fiber sheet 11 wound around the first shaft 12a by a biasing means (not shown) such as a spring. Then, the fiber sheet 11 is pressed against the front surface of the fixing roller 8 by the pressing roller 14 from the back side.

In the fixing roller 8, an elastic layer 16 made of HTV silicone rubber (high-temperature vulcanized silicone rubber) is formed on a metal core 15 made of aluminum, and an oil resistant material made of fluoro rubber is formed on the elastic layer 16. Layer F, and furthermore, RT
An anti-offset layer 17 made of V silicone rubber (room temperature vulcanized silicone rubber) is formed. The outer diameter of the fixing roller 8 is, for example, φ40.

The pressure roller 209 is made of an aluminum core 18.
An elastic layer 19 made of HTV silicone rubber is formed thereon, and a resin layer 20 of a fluororesin is formed on the elastic layer 19. The outer diameter is, for example, φ40.

Halogen heaters 21 are arranged in the core metal 15 of the fixing roller 8 and the core metal 18 of the pressure roller 209, respectively. Then, the temperature of the fixing roller 8 is detected by a thermistor 22 in contact with the fixing roller 8 and the halogen heater 21 is detected.
Is controlled to keep the temperature of the fixing roller 8 constant at about 165 ° C.

The wave unit 10 has a viscosity of 500 cS.
The fiber sheet 11 impregnated with the silicone oil of the second shaft 1 is passed through the drive gear 25A of the drive mechanism 25.
2b and the pressing roller 14
To apply to the offset prevention layer 17 of the fixing roller 8 and remove the toner that has been offset (adhered) to the offset prevention layer 17 of the fixing roller 8.

The wave unit 10 is detachably mounted on the fixing device main body, and can be replaced when the fiber sheet 11 is used up.

According to such a wave unit 10, a sheet carrying a plurality of unfixed toner images in a stacked state is passed while being sandwiched between the rotating fixing roller 8 and the pressing roller 209. The toner images are mixed and thermally fixed on the paper, and a full-color image is formed.

[0018]

However, in a conventional wave unit incorporating such a fiber sheet, the winding diameter of the fiber sheet wound on the second shaft gradually increases as the winding progresses. Therefore, even if the second shaft is rotationally driven at a predetermined angular velocity, the fiber sheet cannot be continuously and stably wound up by a fixed amount. Since this means that the winding speed of the fiber sheet is not constant, the supply amount of the release agent to the surface of the fixing roller by the fiber sheet is not constant.

Further, once the wave unit is replaced, it is impossible to determine whether the fiber sheet mounted on the wave unit is used or unused. Therefore, there is a possibility that a used fiber sheet is erroneously attached and reused.

Accordingly, an object of the present invention is to provide a fixing device capable of winding a fiber sheet for supplying a release agent to the surface of a fixing roller at a constant speed, and an image forming apparatus to which the fixing device is attached. I do.

Another object of the present invention is to provide a fixing device capable of determining whether a fiber sheet for supplying a release agent to the surface of a fixing roller is used or not, and an image forming apparatus to which the fixing device is attached. And

[0022]

In order to solve this problem, a fixing device according to the present invention cooperates with a pressure roller to heat and press a toner image transferred onto a recording medium and press the toner image onto the recording medium. And a non-used part impregnated with a release agent is wound around the first shaft, pressed by a pressing roller to supply the release agent to the surface of the fixing roller, and then rotated by a rotation driving unit. A wave unit provided with a fiber sheet wound around a second shaft to be wound;
A determination unit having a predetermined resistance value, the resistance value of which is changed when the replaced wave unit processes a predetermined number of printed sheets; and when the resistance value of the changed determination unit returns to the resistance value before the change. Determining means for determining that the fiber sheet is new; and determining that the fiber sheet is new, if the determining means determines that the fiber sheet is new, outside the roll of the fiber sheet wound on the second shaft again. And a control means for controlling the rotational angular velocity of the second shaft so that the fiber sheet is wound at a constant speed based on the outer diameter of the roll.

This makes it possible to wind the fiber sheet at a constant speed. Further, it is possible to determine whether the fiber sheet is used or not.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a fixing roller for heating and pressing a toner image transferred to a recording medium and fixing the toner image on the recording medium in cooperation with a pressing roller. The second part is rotated by the rotation driving means after the unused part is impregnated with the release agent, is wound around the first shaft, is pressed by the pressing roller, and supplies the release agent to the surface of the fixing roller, and thereafter is rotated. A wave unit provided with a fiber sheet wound on a shaft, having a predetermined resistance value,
When the replaced wave unit has processed a predetermined number of printed sheets, the determination means changes the resistance value, and when the resistance value of the changed determination means returns to the resistance value before the change, the fiber sheet newly changes the resistance value. Determining means for determining that the fiber sheet has become new, and if the determining means determines that the fiber sheet is new, the roll outer diameter of the fiber sheet wound on the second shaft is determined again, and the roll outer diameter is determined. And a control means for controlling the rotation angular velocity of the second shaft so that the fiber sheet is wound at a constant speed based on the fixing device, whereby the fiber sheet can be wound at a constant speed. It has the effect of becoming. In addition, there is an effect that it is possible to determine whether the fiber sheet is used or not.

According to a second aspect of the present invention, in the first aspect, the determining means comprises a first resistor and a second resistor having a higher resistance value than the first resistor. An image forming apparatus in which a high voltage is applied to the first resistor at the time when the replaced wave unit processes a predetermined number of printed sheets, and the first resistor is melted to change its resistance value. It has the effect of being able to take up at a speed. In addition, there is an effect that it is possible to determine whether the fiber sheet is used or not.

According to a third aspect of the present invention, there is provided an image forming apparatus to which the fixing device according to the first or second aspect is attached, wherein the fiber sheet can be wound at a constant speed. Has an action. In addition, there is an effect that it is possible to determine whether the fiber sheet is used or not.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In these drawings, the same members are denoted by the same reference numerals, and duplicate description is omitted.

FIG. 1 is an explanatory view showing the internal structure of an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram of the image forming apparatus shown in FIG. 1, and FIG. 3 is attached to the image forming apparatus shown in FIG. FIG. 4 is an exploded perspective view of a wave unit in the fixing device of FIG. 3, FIG. 5 is an exploded perspective view of the fixing device of FIG. 3, and FIG. 6 is attached to the fixing device of FIG. FIG. 5 is a circuit diagram showing a circuit configuration of a discrimination device provided.

In FIG. 1, a photoreceptor belt (photoreceptor) 3 on which a photosensitive receptive layer such as an organic photoconductor (OPC) is applied in a thin film form has three photoreceptor belt support / conveyance rollers 3a.
3b and 3c are band-tuned and supported so as to form a horizontal plane on one side, and are rotated circumferentially along photoreceptor belt supporting and conveying rollers 3a, 3b and 3c by a drive motor (not shown). Black (B), cyan (C), magenta (M),
A developing device 2B for storing toner of each color of yellow (Y);
2C, 2M, and 2Y are provided. On the side of the photoreceptor belt 3, a photoreceptor cleaning device 12 for removing the toner remaining on the photoreceptor belt 3, a static eliminator 9 in which an LED lamp is arranged in parallel to eliminate the charge on the photoreceptor belt 3, a photoreceptor belt by corona discharge A charging device 10 for charging 3 is provided, and a laser unit 1 is further provided.

The charger 10 includes a charging wire 10a made of a tungsten wire or the like and a shield plate 10 made of a metal plate.
b, the grid plate 10c. When a high voltage is applied to the charging line 10a, the charging line 10a causes a corona discharge, and the photosensitive belt 3 is uniformly charged via the grid plate 10c. The laser light emitted from the laser unit is controlled by a signal from a host computer (not shown), and a plurality of color components corresponding to a specific component among a plurality of predetermined color components on the photoreceptor belt 3. An electrostatic latent image is formed.

The developing units 2B, 2C, 2M, and 2Y for each color are
The developing units are arranged at equal intervals and detachably in predetermined storage sections provided in the apparatus main body, and the inside of each developing unit has the same configuration except for the type of the stored toner.

The developing units 2B, 2C, 2M, and 2Y are brought into contact with the photosensitive belt 3 when developing a predetermined color electrostatic latent image corresponding to the developing units 2B, 2C, 2M, and 2Y. The developing units 2B, 2C, 2M, and 2Y are provided with contact cams 5B, 5C, 5M, and 5Y.
When it is not pushed in the direction of the photoreceptor belt 3 by M and 5Y, it is held at a standby position separated from the photoreceptor belt 3.

The intermediate transfer member unit includes an intermediate transfer member belt (intermediate transfer member) 4 made of a conductive resin and the like, and three intermediate transfer member belt supporting / conveying rollers 4a for adjusting the intermediate transfer member belt 4. 4b and 4c. In order to transfer the toner image on the photoconductor belt 3 onto the intermediate transfer belt 4, an intermediate transfer roller 13 is disposed to face the photoconductor belt 3 with the intermediate transfer belt 4 interposed therebetween.

Here, the peripheral length of the surface of the intermediate transfer belt 4 is set to be equal to the peripheral length of the photosensitive belt 3. In order to scrape off residual toner on the intermediate transfer belt 4, an intermediate transfer belt cleaning device 15 is installed near the intermediate transfer belt support and transport roller 4c. The intermediate transfer member belt cleaning device 15 is separated from the intermediate transfer member belt 4 while forming a composite image on the intermediate transfer member belt 4, and comes into contact with the intermediate transfer member belt 4 only when it is used for cleaning.

A paper cassette (not shown) for storing paper (recording medium) 14 is provided below the apparatus. Then, the paper 14 is sent out from the paper cassette to the paper transport path one by one by the paper feed roller 17. In order to match the position of the sheet 14 with the composite image formed on the intermediate transfer belt 4, a registration roller 18 for temporarily stopping and waiting the sheet 14 is provided in pressure contact with a driven roller 19. Further, a medium transfer roller (transfer roller) 7 for transferring a composite image formed on the intermediate transfer belt 4 to a sheet 14 by applying a voltage having a polarity different from that of the toner is provided on the sheet transport path. And put the composite image on paper 1
Only when the image is transferred to the intermediate transfer belt 4, the intermediate transfer belt 4 is rotated. The medium transfer roller 7 is made of, for example, conductive foamed polyurethane. In addition, other than the paper 14, for example, an OHP film or the like can be applied to the recording medium.

In order to fix the composite image transferred to the sheet 14, a fixing device 100 including a fixing roller 111 having a heat source therein and a pressure roller 112 is provided.
Then, as the paper 14 passes through the fixing device 100, the composite image transferred by pressure and heat is fixed by the pinching rotation of the fixing roller 111 and the pressure roller 112, and a color image is formed.

As shown in FIG. 2, such an image forming apparatus includes an image forming apparatus main body 101 and a fixing device 100 detachably mounted on the image forming apparatus main body 101.

The fixing device 100 includes a wave unit 103 as a release agent applying means which is composed of a wave roll around which a fiber sheet is wound around a shaft and a shaft which winds the fiber sheet, and which is detachably provided. Determination means 10 for determining whether a sheet is used or not used
It consists of four. The discriminating means 104 includes two resistance fuses 104a having different resistance values (for example, 100Ω).
And a resistor 104b (for example, 10 kΩ) having a resistance value larger than the resistance value of the resistance fuse is arranged in parallel (see FIG. 6). The details of the circuit configuration will be described later.

The image forming apparatus main body 101 includes a rotation drive unit 105, a determination unit 106, and a CPU (control unit) 10.
7, a RAM 108, a clear unit 109, and a rotation control unit 110.

Here, the rotation driving means 105 rotates the shaft for winding the fiber sheet, so that the driving force is increased only when the fixing device 100 with the wave unit 103 mounted is properly mounted on the apparatus main body 101. It is transmitted to the shaft. The judging means 106
Based on the state of the resistance value of the determination unit 104, whether the fixing device 100 is attached to or detached from the apparatus main body 101 and the wave unit 1
03 is used or not used. The CPU 107 controls the entire image forming apparatus. The RAM 108 accumulates and stores the used amount of the fiber sheet of the wave unit 103.
The clearing unit 109 clears the usage amount of the fiber sheet stored in the RAM 108 based on whether the wave unit 103 of the determining unit 106 is used or not. The rotation control unit 110 controls the rotation amount (rotational angular velocity) of the rotation driving unit 105 based on the usage amount of the fiber sheet.

As shown in FIG. 1, the fixing device 100 includes a wave unit 103 detachably provided on the main body of the device.
, A fixing roller 111, and a pressure roller 112.

The fixing roller 111 has a surface temperature of 160 ° C., which is the optimum fixing temperature, due to an internal or external heat source.
Heated to 180 ° C. Further, a pressure roller 112 which comes into contact with the fixing roller 111 and rotates with the rotation of the fixing roller 111 cooperates with the fixing roller 111 to pinch the conveyed unfixed toner image together with the sheet. Further, the wave unit 103 (FIGS. 2 and 3) applies silicone oil as a release agent to the fixing roller 111 and cleans the surface of the fixing roller 111 after the fixing operation. The fixing roller 1
The configuration of the fixing roller 11 and the pressing roller 112 is substantially the same as the fixing roller 8 and the pressing roller 209 shown in FIG.

As shown in FIG. 3, the wave unit 103 includes a first shaft 114 around which a fiber sheet 113 impregnated with a release agent such as silicone oil is wound, and a second shaft 114 around which the fiber sheet 113 is wound. 115, a pressing roller 11 for pressing the fiber sheet 113 from the inside in a longitudinal direction of the surface of the fixing roller 111 with a predetermined pressing force.
6. It is composed of the above-mentioned determination means 104 and the like.
As shown in FIG. 4, one end of the second shaft 115 is provided with a wave gear 117 for transmitting driving by being connected to the rotation driving means 105 of the main body when the fixing device 100 is mounted on the main body. Is attached.

The operation of the image forming apparatus configured as described above will be described below. In FIG. 1, after the charged photoreceptor belt 3 is uniformly discharged by a discharger 9, a charging line 10a in a charger 10 connected to a high-voltage power supply is provided.
To apply corona discharge to the photosensitive belt 3
Is uniformly charged to about -500v to -650v.

Next, the photoreceptor belt 3 is rotated by a driving device (not shown), and a predetermined color of a plurality of color components, for example, black, is placed on the uniformly charged surface of the photoreceptor belt 3. A laser beam corresponding to the image shown in FIG. As a result, the portion of the photoreceptor belt 3 irradiated with the laser beam loses its charge and an electrostatic latent image is formed. on the other hand,
The developing device 2B containing the black toner contributing to the development is brought into contact with the photoreceptor belt 3 by the contact cam 5B being rotated half a time by a color selection signal from a host computer (not shown). . Then, a thin layer of toner to which a predetermined voltage is applied adheres to the electrostatic latent image to form a toner image.

The developing device 2B having completed the development in this way
When the contact cam 5B is further rotated by a half turn, the contact cam 5B moves from the contact position with the photosensitive belt 3 to the standby position. While the developing device 2B is developing, the other developing devices 2C, 2C
M and 2Y are separated from the photoreceptor belt 3.

Next, when, for example, the color of cyan (C) is selected, the developing unit 2C is brought into contact with the photoreceptor belt 3, and starts the development of cyan by the same operation as described above. When four colors are used, such a developing operation is sequentially repeated four times, and the four colors B, C, M, and Y on the intermediate transfer belt 4.
The toner images of the layers are transferred so as to overlap each other, and a composite image is formed here. In the case of one color, a single-layer toner image is formed, in the case of two colors, two layers are formed, and in the case of three colors, a three-layer toner image is formed.

A small amount of toner remaining on the photoreceptor belt 3 without being transferred is cleaned by the photoreceptor cleaning device 12 and prepared for the next process.

When a high voltage having a polarity opposite to that of the toner is applied to the medium transfer roller 7, the composite image thus formed is
The sheet is collectively transferred to the sheet 14 sent from the sheet cassette along the sheet transport path.

The sheet 14 onto which the composite image has been transferred is subsequently sent to the fixing device 100. Then, here, fixing is performed by heat and the sandwiching force between the fixing roller 111 and the pressure roller 112, and a color image is formed. The sheet 14 that has passed through the fixing device 100 is discharged to a discharge tray.

A small amount of toner remaining on the intermediate transfer belt 4 without being transferred is cleaned by the intermediate transfer belt cleaning device 15 being brought into contact with an electromagnetic clutch (not shown) to prepare for the next process. .

In such a series of operations, the fiber sheet 113 wound in a roll shape around the first shaft 114 to form a wave roll is attached to the second shaft 11.
5 is pulled out from the first shaft 114 by the rotation drive.

Here, the determination means 104 will be described in detail with reference to FIG. The determination means 104 is configured by a circuit in which a resistance fuse 104a (Rf = 100Ω) as a first resistance and a resistance 104b (R = 10 kΩ) as a second resistance are arranged in parallel. And these two resistors 104a,
Two terminals (not shown) that are in contact with both ends of 104 b are provided on the fixing device 100 side, and one terminal is connected to the determination unit 106 of the apparatus main body 101 via the fixing device 100 in a circuit configuration. I have. The CPU 107 in the apparatus main body 101 periodically detects the voltage across the two resistors 104a and 104b. And the CPU 10
7 detects the state of the wave unit 103, that is, the state of attachment / detachment of the fixing device 100 and information on whether the wave unit 103 is used or not, based on the voltage of the AD1 port based on the detection result.

The transistors Q1 and Q2 in FIG. 6 are always off, and when the wave unit 103 is not used,
That is, when the fiber sheet 113 is not used, since the resistance fuse 104a (100Ω) is not blown, the resistance fuse 104a (100Ω) and the resistance 104b (10k
Ω) is 99Ω.

Therefore, if the forward voltage drop of the Zener diode is Vf, the voltage of AD1 is AD1 =
(+ 5−Vf) × R ′ / (1.8 kΩ + R ′) + Vf

Next, when the wave unit 103 is newly replaced, when a predetermined number of printed sheets has passed after the replacement (in the present embodiment, the printing operation of 200 sheets, for example, in terms of A4 size paper is performed). At the time when the
A high voltage is applied to both ends of the fuse 04 to blow the resistance fuse 104a. Specifically, the port P1 in FIG. 6 is set to a high level to turn on the transistors Q1 and Q2,
For example, a voltage of 24 V is applied to the resistance fuse 104a and the resistance 104b. Thereby, the resistance fuse 104a
Is applied with a voltage of about 24 V × 24 V / Rf (W) and blows.

By blowing the resistance fuse 104a, the resistance value Rf of the resistance fuse 104a becomes 10 times or more (1 kΩ to ∞) of the initial value, so that the voltage of AD1 becomes larger than before the blowing.

Here, when the voltage of AD1 detected by the CPU 107 in FIG.
V, when the variation in each resistor is ± 5% and Vf is 0 to 1 V, when the wave unit 103 is not used, about 1.25 V or less, and when the wave unit 103 is already used, about 1. 54 to 4.66V. That is, when the wave unit 103 is not used, the voltage between both ends of the two resistors 104a and 104b becomes 1.4V or less.
When used, the voltage becomes 1.4 V or more.

Therefore, when the voltage between both ends of the two resistors changes from a state exceeding 1.4 V to 1.4 V or less, the judging means 106 replaces the wave unit 103 and becomes new. It is determined that the fiber sheet 113 is new. And at that time clear means 10
9 clears the usage data of the fiber sheet 113 accumulated and stored in the RAM 108 once. Then, the amount of newly wound fiber sheet 113 wound by the second shaft 115 is integrated, and the value is newly stored in the RAM 108. Next, the CPU 107 determines the current second shaft 1 based on the accumulated usage amount stored in the RAM 108.
The roll outer diameter is calculated based on the amount of winding of the fibrous sheet 113, and a command is issued to the rotation control means 110 so that the fibrous sheet 113 is constantly fed by a constant amount at a constant rate. Control.

As described above, according to the present embodiment, the CP
Since the rotational angular velocity of the second shaft 115 for winding the fiber sheet 103 is controlled by U107, the fiber sheet 113 can be wound at a constant speed.

Also, the replaced wave unit 103
Changes the resistance value of the discriminating means 104 at the time when the predetermined number of printed sheets are processed, and detects the changed resistance value of the discriminating means 104 by the judging means 106. Can be determined.

[0062]

As described above, according to the present invention, since the rotational angular velocity of the second shaft for winding the fiber sheet is controlled by the control means, the fiber for supplying the release agent to the surface of the fixing roller is controlled. An effective effect that the sheet can be wound at a constant speed can be obtained.

Further, according to the present invention, the resistance value of the discriminating means is changed when the replaced wave unit processes a predetermined number of printed sheets, and the changed resistance value is detected by the judging means. Thus, it is possible to determine whether the fiber sheet for supplying the release agent to the surface of the fixing roller is used or not.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an internal structure of an image forming apparatus according to an embodiment of the present invention;

FIG. 2 is a block diagram of the image forming apparatus of FIG. 1;

FIG. 3 is an explanatory diagram illustrating a structure of a fixing device attached to the image forming apparatus of FIG. 1;

FIG. 4 is an exploded perspective view of a wave unit in the fixing device of FIG. 3;

FIG. 5 is an exploded perspective view of the fixing device of FIG. 3;

FIG. 6 is a circuit diagram showing a circuit configuration of a determination device attached to the fixing device of FIG. 3;

FIG. 7 is a schematic diagram showing the structure of a fixing device in a conventional image forming apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 fixing device 103 wave unit 104 determination means 104 a resistance fuse (first resistance) 104 b resistance (second resistance) 106 determination means 107 CPU (control means) 111 fixing roller 112 pressure roller 113 fiber sheet 114 first shaft 115 second shaft 116 pressing roller

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Terayama 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Hisaki Yonekura 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shunichi Hashimoto 1006 Okadoma Kadoma, Kadoma City Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (3)

    [Claims]
  1. A fixing roller that heats and presses a toner image transferred onto a recording medium and fixes the toner image onto the recording medium in cooperation with a pressure roller; A wave provided with a fiber sheet wound around a first shaft, fed by a pressing roller to supply the release agent to the surface of the fixing roller, and then wound by a second shaft rotated by a rotation driving unit. A unit having a predetermined resistance value, a determining unit for changing the resistance value when the replaced wave unit processes a predetermined number of printed sheets, and a resistance before the resistance value of the changed determining unit is changed. When the value returns to the value, a judging means for judging that the fiber sheet is new, and if the judging means judges that the fiber sheet is new, the fiber sheet is renewed. The roll outer diameter of the fiber sheet wound on the second shaft is determined, and the rotational angular velocity of the second shaft is controlled based on the roll outer diameter so that the fiber sheet is wound at a constant speed. And a control unit for performing the fixing.
  2. 2. The apparatus according to claim 1, wherein said discriminating means comprises a first resistor and a second resistor having a higher resistance value than said first resistor, wherein said replaced wave unit processes a predetermined number of printed sheets. 2. The image forming apparatus according to claim 1, wherein a high voltage is applied to the first resistor to blow the first resistor and change the resistance value.
  3. 3. An image forming apparatus to which the fixing device according to claim 1 is attached.
JP7212898A 1998-03-20 1998-03-20 Fixing device and image forming device installed with the device Pending JPH11272106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7212898A JPH11272106A (en) 1998-03-20 1998-03-20 Fixing device and image forming device installed with the device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7212898A JPH11272106A (en) 1998-03-20 1998-03-20 Fixing device and image forming device installed with the device

Publications (1)

Publication Number Publication Date
JPH11272106A true JPH11272106A (en) 1999-10-08

Family

ID=13480374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7212898A Pending JPH11272106A (en) 1998-03-20 1998-03-20 Fixing device and image forming device installed with the device

Country Status (1)

Country Link
JP (1) JPH11272106A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385799B2 (en) 2009-07-15 2013-02-26 Ricoh Company, Limited Lubricating device, fixing device, and image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385799B2 (en) 2009-07-15 2013-02-26 Ricoh Company, Limited Lubricating device, fixing device, and image forming apparatus

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