JP3009198B2 - Image forming device - Google PatentsImage forming device
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- JP3009198B2 JP3009198B2 JP2255440A JP25544090A JP3009198B2 JP 3009198 B2 JP3009198 B2 JP 3009198B2 JP 2255440 A JP2255440 A JP 2255440A JP 25544090 A JP25544090 A JP 25544090A JP 3009198 B2 JP3009198 B2 JP 3009198B2
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- Expired - Fee Related
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Description: TECHNICAL FIELD The present invention relates to an image forming apparatus such as a copying machine or a laser printer.
[Prior Art] Conventionally, as one of fixing methods of a developer image (hereinafter, referred to as a toner image) in an image forming apparatus represented by an electrostatic copying machine or the like, at least one of the fixing methods is an integrated fixing unit. There is a method in which a copy sheet as a recording material is passed between the pressure contact rollers, and the transferred toner image is fused to the paper surface using heat and pressure force of the rollers.
In this fixing method, the fused toner image comes into contact with the heat fixing roller, so that the roller is generally coated with a fluorine-based resin having good releasability. However, the melted toner is soft and viscous, so it adheres to the roller surface, and causes winding of copy paper and the like. Therefore, conventionally, a fixing roller is provided with a release agent application and a means for cleaning the offset toner on the roller surface. Proposals concerning control methods for the release agent application and cleaning means include, for example, those disclosed in JP-A-58-205177, JP-A-58-205179, JP-A-58-205180, and others. There are many proposals such as intermittent control of a mold applying member, rotation speed or pressing control of an applying roller, and control of a release agent supply pump.
[Problems to be Solved by the Invention] However, according to the above-described conventional example, the degree of adhesion of the offset toner is determined by entanglement of a plurality of causes such as temperature, paper area, and document density. It was very difficult to do.
SUMMARY OF THE INVENTION It is an object of the present invention to provide an image forming apparatus having a fixing device capable of solving the above-mentioned problems and performing optimal control in preventing and removing the offset toner.
According to the present invention, the above object is achieved by an unfixed image forming unit that forms an electrostatic latent image on an image carrier to form an unfixed image, and the unfixed image forming unit. An image forming apparatus comprising: a fixing unit that fixes a formed unfixed image on a recording material; and a release agent supply unit that contacts the fixing unit and supplies a release agent. A frictional force detecting means for detecting a frictional force with the means, and a surface potential detecting means for detecting a surface potential of the image carrier, wherein the releasing agent supply means includes the frictional force detecting means and the surface potential detecting means. This is achieved by controlling by fuzzy inference based on the detection result of the means.
Example A first example and a second example of the present invention will be described with reference to the accompanying drawings.
<First Embodiment> First, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a basic block diagram of a control unit in a fixing device used in the image forming apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a CPU serving as control means for performing fuzzy (fuzzy) control on the cleaning force of the cleaning web. Further, the CPU 1 is inference means for performing fuzzy inference to be described later, and is also calculation means for obtaining a quantitative value for the control amount. The CPU 1 is connected to a ROM 2 as storage means, and stores a control program, fuzzy control rules, membership functions, and the like, which will be described later. Further, a RAM 3 is connected to the CPU 1 as a work area for inference and calculation.
As described above, CPU1 operated by the control program
It is connected to the I / O4 and outputs a signal to the drive circuit 6 of the drive motor 5 for the cleaning web via the I / O4. In the present embodiment, the cleaning force is controlled by changing the energizing time to the drive motor 5, but the control amount depends on the state amount such as the surrounding environment.
The state quantity is detected by the state quantity detection means,
In this embodiment, a thermistor 7 for detecting the surface temperature of the fixing roller, a thermistor 8 for detecting the ambient temperature, and a sensor 9 for detecting the surface potential of the photosensitive drum are provided. The analog signal from these detection means is output to the A / D converter 1
The signal is input as a digital signal to the CPU 1 via 0 and is processed.
Next, the main body of the image forming apparatus of the present invention having the above-described control unit will be described with reference to FIG.
In FIG. 2, reference numeral 11 denotes a platen glass on which a document is placed. The document on the platen glass 11 is irradiated with light by an illumination lamp 12. Then, the reflected light has its optical path changed by the scanning reflecting mirrors 13, 14, and 15 and passes through the lens 16. The lens 16 has focusing and zooming functions. The light that has passed through the lens 16 has its optical path changed again by the reflection mirror 17 and is irradiated onto the photosensitive drum 18. In addition,
The illumination lamp 12 and the scanning reflection mirrors 13, 14, 15 are moved in the left-right direction in FIG. 2 by an optical system motor 19A, so that the optical path length is kept constant.
On the other hand, the surface of the photosensitive drum 18 is composed of a seamless photosensitive member using a photoconductor and a conductor, and forms an electrostatic latent image on the surface. The photosensitive drum 18 is rotatably supported by a shaft, and starts rotating clockwise in FIG. 2 by a main motor 19B which operates in response to pressing of a copy start key described later. The surface of the rotating photosensitive drum 18 is corona-charged by a primary charger 20 disposed above the photosensitive drum 18. Thereafter, the image (original image) irradiated by the above-described optical system is subjected to slit exposure, and an electrostatic latent image is formed on the photosensitive drum 18 by a known Carlson process. The surface potential sensor 9 described above is provided downstream of the exposure position in the rotation direction, and detects the surface potential of the photosensitive drum 18.
A developing roller 21 as a developer carrying member is provided to face the photosensitive drum 18 further downstream in the rotation direction than the position where the surface potential sensor 9 is provided. The developing roller 21 is provided in a developing device 22 containing a developer (hereinafter, referred to as toner), and develops the electrostatic latent image on the photosensitive drum 18 with the toner carried on the developing roller 21 to form a toner image. Visualize as
Next, the toner image formed on the photosensitive drum 18 is transferred onto a recording material, and the recording material is any one of the manual feed port 23, the upper cassette 24, and the lower cassette 25. Paper is fed from inside by a paper feed roller 26 or 27, and is conveyed to a transfer position by a registration roller 28 disposed below the developing device 22. The toner image is transferred onto the recording material conveyed to the transfer position by the transfer charger 29, and the transferred recording material is separated from the surface of the photosensitive drum 18 by the separation charger 30. Thereafter, the surface of the photosensitive drum 18 is cleaned by the cleaning unit 31, and the separated recording material is
The recording material is placed on a transport belt 32 that guides the recording material to a fixing device. The recording material guided to the fixing device 33 has an unfixed toner image fixed thereon, and is discharged out of the main body by a discharge roller 34.
Next, the fixing device 33 used in the image forming apparatus will be described in detail with reference to FIG.
In FIG. 3, a fixing roller 35 is rotatably supported. The thermistor 7 for detecting the surface temperature is in contact with the surface of the fixing roller 35. Above the fixing roller 35, a pressing roller 37 made of an elastic body for pressing a belt-shaped cleaning web 36 made of a nonwoven fabric of the fixing roller 35 is rotatably supported. The cleaning web 36 is wound around a delivery shaft 38, and is wound around a take-up shaft 39 that is rotated and driven from the other end. Arrow A indicates the direction of rotation of the fixing roller 35, and arrow B indicates the direction in which the cleaning web 36 is fed. The recording material having the unfixed toner image formed on the upper surface passes between the entrance guide 40 and the fixing roller 35 having a heat source therein and the pressure roller 41 which is pressed against the fixing roller 35 and rotatably supported. And is heated and pressed, and fixed to the recording material. Thereafter, the recording material is discharged outside through a pair of paper discharge rollers 34 driven to rotate in opposite directions.
At this time, the fixing roller 35 and the toner T that forms an image on the recording material partially adhere to the fixing roller 35 (a phenomenon called an offset). The toner T attached to the fixing roller 35 rotates in the direction of arrow A and is wiped off by the cleaning web 36 moving at a much lower speed than the fixing roller 35.
FIG. 4 is a perspective view showing a driving device of the cleaning web 36. In FIG. 4, reference numeral 36 denotes a cleaning web made of a nonwoven fabric or the like, 37 denotes a pressing roller, 39 denotes a web winding shaft, and 38 denotes a delivery shaft. A gear is provided at the shaft end of the motor 5 which is the driving source.
41 is fixed, and meshes with a gear 42 fixed to the winding shaft 39 of the cleaning web 36. Thus, the winding shaft 39 of the cleaning web 36 is a mechanism independent of the rotation of the photosensitive drum 18, the fixing roller 35, and the like.
The amount of toner adhering to the fixing roller 35 due to the offset varies depending on the surrounding environment. Therefore, the present invention
Optimum cleaning is performed by detecting the surrounding environment by the detecting means and adjusting the driving time of the cleaning web 36 according to the environment.
The present invention uses so-called fuzzy (fuzzy) control for such control of the cleaning force. Hereinafter, a fuzzy control method according to the present invention will be described.
First, as the state of the surrounding environment which affects the offset toner amount, three state quantities of a temperature deviation from a target temperature and an actual fixing roller temperature, a recording material (paper) area, and a document density are used.
The state quantity can be obtained by calculating the difference between the value detected by the thermistor 7 and the target temperature stored in the ROM 2. In addition, the above-mentioned state quantity is obtained by detecting the paper size (A4, B4, etc.) according to the type of the paper feed cassette, etc., and retrieving or calculating data on the area previously stored in the ROM 2. Obtained by Further, the above state quantity is converted from a value detected by the surface potential sensor 9 disposed opposite to the photosensitive drum 18.
The control amount is the driving time of the cleaning web 36 per recording material, that is, the power supply time to the web feed motor 5, as described above.
The present invention expresses the state quantity and the control quantity as some qualitative fuzzy (fuzzy) variables.
First, the following four fuzzy variables are defined for the temperature deviation.
I) NB (Negative Big Negative value has a large absolute value) II) NS (Negative Small Negative value has a small absolute value) III) ZO (Zero near zero) IV) P (Positive positive value) For paper area, the following three fuzzy variables are defined.
I) S (Small small) II) M (Medium medium) III) B (Big big) Next, the following four fuzzy variables are defined for the document density.
I) LL (very low surface potential and very low concentration) II) L (low surface potential and low concentration) III) H (high surface potential and high concentration) IV) HH (very high surface potential) (The concentration is very high.) Then, for the control amount, the following four fuzzy variables are defined.
I) SS (extremely short) II) S (short) III) L (long) IV) LL (extremely long) Next, the quantitative values that can be taken by each of the above-mentioned state quantities and control quantities are expressed by the above fuzzy variables. Is defined as 1 as a maximum value, which is represented by a function (hereinafter, this function is referred to as a membership function). This membership function is
(A) to (D). For example, in FIG. 5 (A), at 10 ° C., which is a quantitative value that the temperature deviation can take, the degree belonging to the fuzzy variables NB and ZO is the minimum value 0, and the degree belonging to the fuzzy variable NS is the maximum value 1 It is. 5 ℃ is
The degree belonging to NS and ZO is 0.5. In ROM2, the above degree is stored as a fuzzy set expressed by a membership function, so if a quantitative value is obtained by the detection means, by calculating from each membership function,
The degree belonging to each ambiguous variable can be obtained.
Next, the state quantity and the control quantity are related by a conditional proposition. This is called a fuzzy control rule. The fuzzy rules used in this embodiment are as follows.
First, a rule for the energization time of the motor with respect to the temperature deviation and the paper area is determined.
(Rule 1) If temperature deviation = NB and paper area = S then energizing time = L (Rule 2) If temperature deviation = NB and paper area = M then energizing time = LL (Rule 3) If temperature deviation = NB and paper area = B then energizing time = LL (Rule 4) If Temperature deviation = NS and paper area = S then energizing time = S (Rule 5) If Temperature deviation = NS and paper area = M then energizing time = L (Rule 6) If Temperature deviation = NS and paper area = B then energizing time = LL (Rule 7) If temperature deviation = ZO and paper area = S then energizing time = SS (Rule 8) If temperature deviation = ZO and paper area = M then energizing time = S (Rule 9) If temperature deviation = ZO and paper area = B then energization time = S (Rule 10) If temperature deviation = P and paper area = S then energization time = SS (Rule 11) If temperature deviation = P and Paper area = M then energizing time = SS (Rule 12) If Temperature deviation = P and paper area = B then energizing time = S Define 12 or more rules. The above rules are summarized and shown in FIG. 6 using only fuzzy variables. The part between If and then in the above rule is called the antecedent part, and the part after then is called the consequent part.
Next, a method of fuzzy inference performed using the above rules will be described.
First, the temperature is inputted by the detecting means, the temperature deviation is obtained, and the paper area is obtained. And for one rule,
The degree to which the detected temperature deviation and paper area belong to the fuzzy variables set in the antecedent part is obtained. The smaller of the obtained degrees is adopted, and the adopted degree is
The optimal degree is inferred for the fuzzy variable about the energization time set in the consequent part. Hereinafter, similar inference is performed for each rule. However, of the values obtained by detection,
If the degree belonging to the fuzzy variable in the antecedent is zero, no inference is made for the rule.
In this way, the optimal degree is determined for each consequent part, and finally a weighted average of the optimal degree is calculated,
A quantitative value indicating the energization time is obtained as a control amount.
Next, a specific example will be described with reference to FIG.
For simplification of the description, an example using only rules 5 and 8 will be described.
Let x be the obtained temperature deviation and y be the paper area. As shown in FIG. 7, a fuzzy variable NS, M is set in the antecedent part of Rule 5. Therefore, the degree to which the temperature deviation x belongs to NS is determined from the membership function. (U 5 (x)). Next, determine the degree to which paper area y belongs to M from the membership function (a V 5 (y)). And U
Take the minimum value of 5 (x) and V 5 (y) (U 5 (x) <V
5 (y)), the optimal degree of the energization time set in the consequent part in the fuzzy variable L is determined by the minimum value U 5
(X). Similarly, from rule 8, x is ZO
The degree U 8 (x) belonging to, degree belongs above y is the M V
From 8 (y), the optimal degree in S is inferred as V 8 (y). Next, the membership function indicating the above L
A trapezoid formed when divided by U 5 (x) and a trapezoid formed when the membership function indicating S is divided by the degree V 8 (y) are combined, and the area of the combined region Find the center of gravity at. The point on the horizontal axis corresponding to the center of gravity is the quantitative energization time to be obtained.
As described above, the optimum control amount can be obtained. In the present embodiment, in order to take into account the influence of the original density, which is another state quantity, a fuzzy control rule for the energization time with respect to the temperature deviation and the original density is determined, and a quantitative A good energizing time. Finally, the final control amount is obtained by calculating the average of the two quantitative energization times. The fuzzy control rules for the power distribution time with respect to the temperature deviation and the document density used are those shown in FIG.
Next, the flow up to the setting of the energizing time in the apparatus of this embodiment using the flowchart of FIG.
First, the surface temperature of the fixing roller 35 is detected by the thermistor 7 (step 100), and then the paper size is detected (step 101). Then, the temperature deviation and the paper area are calculated from the detected values (step 102). Inference is performed from each fuzzy rule shown in FIG. 6 based on the calculated values (steps 103 to 105). However, at this time, if the degree belonging to the fuzzy variable becomes zero, inference by the rule is not performed. When the inference has been completed for all the rules, the trapezoids obtained by the inference are combined (step 106), the center of gravity is calculated, and this is set as the center of gravity 1 (step 107). Next, the surface potential of the photosensitive drum is detected by the sensor 9 (step 108), and inference is made from each fuzzy rule shown in FIG. 8 based on the detected value (steps 109 to 111). Also in this case, when the fuzzy variable becomes zero, no inference based on the rule is performed. When the inference for each fuzzy rule is completed, each trapezoid obtained by the inference is synthesized (step 11).
2) The center of gravity is calculated, and this is set as the center of gravity 2 (step 113). Next, the center of gravity of the previously calculated center of gravity 1 and the center of gravity 2 are calculated (step 114), and a quantitative energization time for the center of gravity is obtained from the membership function of FIG. Step 115).
As described above, according to this embodiment, the energizing time of the drive motor for the cleaning web can be set to an optimum value based on the plurality of state quantities, so that the cleaning of the offset toner can be effectively performed. Can do it.
Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted.
In the present embodiment, the set temperature of the fixing roller is fuzzy inferred from the ambient temperature and the elapsed time from the start of energization with the main switch turned on, and the control of the first embodiment is continued. It is what you do. FIGS. 10A and 10B show the membership function of the fuzzy set of the ambient temperature, which is the state quantity, and the elapsed time from the start of energization with the main switch turned on. FIG. 10C shows a membership function of a fuzzy set of a set temperature as a control amount.
First, regarding ambient temperature, low temperature is expressed by TL (Temperature Law), high temperature is expressed by TH (Temperature High), and medium temperature is expressed by TM (Temperature Medium). In addition, regarding the elapsed time from the start of energization with the main switch turned on, a short one is set to S.
(Short), the medium one was M (Medium), and the long one was L (Long).
In addition, high temperature setting is high, medium temperature setting is medium,
The low temperature setting is represented by a membership function marked low.
The fuzzy T control rules shown in FIG. 11 were used. Next, an example of fuzzy inference will be described with reference to FIG. 12. If the detected ambient temperature is 10 ° C. and the elapsed time is 22.5 minutes, first, 10 ° C. is TL = 1
And the elapsed time of 22.5 minutes means that S = 0.5 and M = 0.5
Becomes Take the minimum value of 1 and 0.5, cut off the head of the membership function for medium and high temperature setting by 0.5, and take the center of gravity of both membership functions to obtain a specific value of 18
5 ° C. can be obtained in this example. In this way,
The set temperature of the fixing roller is fuzzy inferred from the ambient temperature and the elapsed time. Then, when this set temperature changes, the temperature deviation (the value obtained by subtracting the set temperature from the roller surface temperature)
Changes due to the influence of the ambient temperature and the elapsed time, and furthermore, the energizing time of the web feed motor changes due to the influence.
FIG. 13 shows a flowchart for determining the energizing time of the web motor by this fuzzy inference. Step 20
8 and thereafter are the same as in the first embodiment. As shown here, the input of the state quantity is composed of a total of five state quantities of ambient temperature, elapsed time, roller surface temperature, paper size, and photoconductor surface potential,
The web motor energization time, which is the final control amount, is controlled. Further, the web motor energizing time may be determined by fuzzy inference by adding a designation signal of another paper type, a fixing device operation history, and a state quantity such as a pressing force of a pressure roller.
<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted.
This embodiment shows an example in which a releasing roller applying / cleaning roller called a so-called felt roller is used without using a cleaning web. In FIG. 14, reference numeral 42 denotes a roller in which heat-resistant fibers are implanted by a felt roller and a felt impregnated with silicone oil as a release agent is wound in a cylindrical shape. Also,
Reference numeral 43 denotes a nozzle for supplying the silicone oil pumped by an oil pump (not shown) to the felt roller. Reference numeral 44 denotes a rubber roller made of a silicone sponge or the like, which is a sensor for detecting the state of oil application to the fixing roller by a change in frictional force between the rubber roller and the fixing roller, and is connected to a rotational torque meter (not shown).
In the apparatus of the present embodiment as described above, the amount of silicone oil supplied to the felt roller 44 is used as the control amount. As the state quantity, a signal from the frictional force detection sensor and a document density (photosensitive drum surface potential) are used.
FIGS. 15A and 15B show the membership functions with the frictional force and the surface potential of the photosensitive drum as state quantities. First,
FIG. 15 (A) is a membership function showing the state of frictional force.
S indicates that the frictional force is small, M indicates that the frictional force is medium, and L indicates that the frictional force is large.
FIG. 15 (B) shows the average value of the photosensitive drum surface potential in order to indicate the document density.
LL has a very low surface potential and a very low concentration. L indicates a low surface potential and a low concentration. H indicates a high surface potential and a high concentration. HH indicates a very high surface potential and a very high concentration.
FIG. 16 shows a control amount indicating the amount of silicone oil applied.
S indicates that the amount of small coating is small, M indicates that the amount of medium is medium, and B indicates that the amount of coating is large.
FIG. 17 is a table showing the fuzzy control rules.
The method of determining the application amount, which is the control amount, from this fuzzy control rule is the same as in the first and second embodiments, and will not be described here.
FIG. 18 shows a flowchart of the oil application amount determination. First, the frictional force (rotational torque) is input by the frictional force detection sensor 44 (step 300), and then the document density (surface potential) is input by the sensor 9 shown in FIG. 2 (step 301). After that, in accordance with the fuzzy control rules shown in FIG. 17, all the rules are inferred,
(Steps 302 to 304), as in the other embodiments, a trapezoidal set is synthesized (Step 305). Then, the center of gravity is calculated (step 306), and the amount of applied oil is determined based on the center of gravity (step 307). Thus, the oil pump can be optimally controlled.
[Effects of the Invention] As described above, according to the present invention, the release agent supply unit is controlled by fuzzy inference based on the detection results of the frictional force detection unit and the surface potential detection unit. It becomes easy to optimize the supply amount of the mold agent. Therefore, it is possible to provide an image forming apparatus having a fixing device in which an image is not adversely affected by the offset toner.
FIG. 1 is a block diagram showing a schematic configuration of a control unit in the first embodiment of the present invention, FIG. 2 is a sectional view showing a schematic configuration of the first embodiment of the present invention, and FIG. FIG. 4 is a sectional view showing a schematic configuration of a fixing device used in the apparatus, and FIG.
FIG. 5 (A) is a diagram showing a membership function of a temperature deviation in the device of the first embodiment, and FIG. 5 (B) is a partially broken perspective view showing a schematic configuration of a driving mechanism in a cleaning web of the device. FIG. 5C is a diagram showing a membership function of document density in the first embodiment, and FIG. 5D is a diagram showing a membership function of document density in the first embodiment. FIG. 6 is a diagram showing a membership function of the drive motor energizing time of the cleaning web in the device, FIG. 6 is a diagram showing a fuzzy control rule in the first embodiment device, and FIG. 7 is an example of fuzzy inference in the first embodiment device. FIG. 8, FIG. 8 is a diagram showing another fuzzy control rule in the first embodiment, FIG. 9 is a flowchart showing a flow of fuzzy control in the first embodiment, and FIG. Second embodiment device FIG. 10 (B) is a diagram showing a membership function of elapsed time in the device of the second embodiment, and FIG. 10 (C) is a diagram showing a membership function of the set temperature in the device of the second embodiment. FIG. 11 shows a membership function, FIG. 11 shows a fuzzy control rule in the second embodiment, FIG. 12 shows an example of fuzzy inference in the second embodiment, and FIG. 13 shows a second embodiment. FIG. 14 is a flow chart showing the flow of fuzzy control in the device, FIG. 14 is a cross-sectional view showing a schematic configuration of the device of the third embodiment of the present invention, and FIG. 15 (A) shows the membership function of the frictional force in the device of the third embodiment. FIG. 15 (B) is a diagram showing a membership function of document density in the third embodiment, FIG. 16 is a diagram showing a membership function of coating amount in the third embodiment, and FIG. In the third embodiment device Shows a Ajii control rule, FIG. 18 is a flowchart showing the flow of the fuzzy control in the third embodiment device. 1 ... Control means, inference means, calculation means (CPU) 2 ... Storage means (ROM) 7,8,9 ... State quantity detection means (thermistor, sensor) 35 ... Fixing means (fixing roller) 36 ... Cleaning means (cleaning web) 41 ... Fixing means (pressure roller)
──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. 7 , DB name) G03G 13/20 G03G 15/20 G03G 15/00 303 G03G 21/00 370-502
- An unfixed image forming means for forming an electrostatic latent image on an image carrier to form an unfixed image, and fixing the unfixed image formed by the unfixed image forming means on a recording material. Means, and an image forming apparatus having a release agent supply unit that supplies a release agent in contact with the fixing unit, wherein a frictional force detection unit that detects a frictional force between the release agent supply unit and the fixing unit; Surface potential detecting means for detecting the surface potential of the image carrier, wherein the release agent supply means is controlled by fuzzy inference based on the detection results of the friction force detecting means and the surface potential detecting means. Characteristic image forming apparatus.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2255440A JP3009198B2 (en)||1990-09-27||1990-09-27||Image forming device|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2255440A JP3009198B2 (en)||1990-09-27||1990-09-27||Image forming device|
|Publication Number||Publication Date|
|JPH04134476A JPH04134476A (en)||1992-05-08|
|JP3009198B2 true JP3009198B2 (en)||2000-02-14|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|JP2255440A Expired - Fee Related JP3009198B2 (en)||1990-09-27||1990-09-27||Image forming device|
Country Status (1)
|JP (1)||JP3009198B2 (en)|
Families Citing this family (3)
|Publication number||Priority date||Publication date||Assignee||Title|
|EP1265114A3 (en)||2001-06-04||2003-05-21||Ricoh Company, Ltd.||Fixing device, web differential gear and image formation apparatus|
|JP2009063906A (en)||2007-09-07||2009-03-26||Sharp Corp||Image forming apparatus|
|JP6540146B2 (en) *||2015-03-25||2019-07-10||コニカミノルタ株式会社||Fixing device and image forming apparatus|
- 1990-09-27 JP JP2255440A patent/JP3009198B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
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|LAPS||Cancellation because of no payment of annual fees|