JP2002169408A - Fixing device for toner image and electrophotographic device - Google Patents

Fixing device for toner image and electrophotographic device

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Publication number
JP2002169408A
JP2002169408A JP2000365224A JP2000365224A JP2002169408A JP 2002169408 A JP2002169408 A JP 2002169408A JP 2000365224 A JP2000365224 A JP 2000365224A JP 2000365224 A JP2000365224 A JP 2000365224A JP 2002169408 A JP2002169408 A JP 2002169408A
Authority
JP
Japan
Prior art keywords
toner image
paper size
means
temperature
unit
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
JP2000365224A
Other languages
Japanese (ja)
Inventor
Satoru Oyamada
悟 小山田
Original Assignee
Niigata Fuji Xerox Manufacturing Co Ltd
新潟富士ゼロックス製造株式会社
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 Niigata Fuji Xerox Manufacturing Co Ltd, 新潟富士ゼロックス製造株式会社 filed Critical Niigata Fuji Xerox Manufacturing Co Ltd
Priority to JP2000365224A priority Critical patent/JP2002169408A/en
Publication of JP2002169408A publication Critical patent/JP2002169408A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a fixing device for a toner image and an electrophotographic device where consumption of electricity is lowered, service lives are prolonged, control procedure is simplified and lower cost is achieved as compared with a conventional device and also to carry out high quality fixing of a toner image. SOLUTION: In the device, activation of a heating means that is not necessary for a paper size is halted from the start by collecting paper size information beforehand and making use of the paper size information. Temperature data corresponding to the paper size are stored to memory beforehand and the most appropriate temperature control is carried out for the inputted paper size.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an apparatus for copying a character or image printed on paper or film onto another copy such as paper or film. Since the present invention includes a step of forming a toner image by reading a character or an image using an optical system at the time of copying, it is referred to as an electrophotographic apparatus to distinguish it from a copying apparatus that does not include such a step. In addition, a sheet including a non-paper copy such as a plastic film is also referred to as a sheet.

[0002]

2. Description of the Related Art In an electrophotographic apparatus, there is a process in which a toner image formed on a sheet by using static electricity is melted at a high temperature and fixed on the sheet. This conventional example will be described.

The conventional example disclosed in Japanese Patent Application Laid-Open No. 61-35472 is provided with one heater provided in a pressing roller and one temperature controller for controlling the heater. Further, the sheet width is detected, and the control temperature is switched according to the sheet width data.

In the conventional example disclosed in Japanese Patent Application Laid-Open No. 4-181982, a plurality of heaters are provided in a pressing roller,
A temperature controller is provided for individually heating the surface of the pressing roller for each of the plurality of portions and for controlling the surface temperature of the pressing roller for each of the plurality of portions.

[0005]

Problems to be Solved by the Invention
In the conventional example disclosed in Japanese Patent Application Publication No. 2 (1999) -1995, since the pressing roller is heated by one heater, it cannot cope with the variation in the surface temperature of the pressing roller. That is, depending on the size of the sheet, there is a portion where the surface of the pressing roller is not in contact with the sheet. At this time, there is a variation in the temperature distribution between the portion that contacts the sheet and the portion that does not contact the sheet because the sheet absorbs heat. However, it is difficult for one heater to cancel this variation. Further, such a variation in the surface temperature causes a variation in the surface temperature not only in the non-contact portion but also in the contact portion between the sheet and the pressing roller, which adversely affects the fixing process of the toner image.

As a technique proposed to eliminate such a variation, there is a conventional example disclosed in Japanese Patent Application Laid-Open No. 4-181982. In this conventional example, since the surface temperature of the pressing roller can be individually controlled for a plurality of portions, it is possible to eliminate variations in the temperature distribution. At this time, in this conventional example, the non-contact portion of the pressing roller with the paper is heated in the same manner as the contact portion. The non-contact portion of the sheet does not absorb heat in the sheet compared to the contact portion, and thus reaches a high temperature more quickly than the contact portion, and the sensor detects this and stops heating. However, when the surface temperature of the non-contact portion is lowered again, the heating is restarted. That is, the operation of heating → stop → heating → stop →... Is also repeatedly performed on the non-contact portion with the sheet.

Such an operation is not preferable in realizing low power consumption. In addition, the surface temperature of one pressing roller is divided into a plurality of portions, and heating and cooling are alternately repeated at different periods, which may cause distortion of the material of the pressing roller. Furthermore, the fact that the heater at the non-contact portion with the paper which is not necessarily needed repeatedly performs heating and stopping repeatedly, which means that the life of the heater is wasted and the life of the apparatus is extended. Is not preferred. In addition, since temperature control is also performed on heaters that are originally unnecessary, the control procedure is unnecessarily complicated, which is not preferable for simplifying the control procedure.

The present invention has been made in view of such a background, and a toner image capable of achieving lower power consumption, longer life, simplification of a control procedure and lower cost as compared with the related art. It is an object of the present invention to provide a fixing device and an electrophotographic apparatus. SUMMARY OF THE INVENTION It is an object of the present invention to provide a toner image fixing device and an electrophotographic apparatus capable of fixing a high quality toner image.

[0009]

According to the present invention, the paper size information is collected in advance, and by using the paper size information, the operation of the heating means unnecessary for the paper size is stopped from the beginning. Features. As a result, it is possible to reduce the power consumption, extend the life, and simplify the control procedure as compared with the related art. Furthermore, if the life is the same as that of the conventional art, the heat generating means can be made inexpensive, so that the cost can be reduced. Also,
Since the control procedure can be simplified, the cost can be reduced.

Further, temperature data corresponding to the paper size is stored in the memory in advance, and the temperature control optimal for the input paper size can be performed.

That is, a first aspect of the present invention is a fixing device for a toner image, comprising a pressing roller formed in a tubular shape, a heating means provided in a tube of the pressing roller, and a surface of the pressing roller. Measuring means for measuring the temperature, and control means for controlling the temperature of the heat generating means according to the measurement result of the measuring means, wherein the heat generating means is provided divided into a plurality of locations in the pipe, the measuring means Is a fixing device for a plurality of toner images provided at positions where the surface temperature of the pressing roller corresponding to the plurality of heat generating means provided separately can be measured.

Here, a feature of the present invention is that a means for collecting paper size information is provided, and means for judging the presence / absence and position of a non-contact portion of the pressing roller with paper according to the paper size information. According to the determination result, there is provided means for suspending the operation of the heat generating means for the non-contact portion prior to the execution of fixing of the toner image.

The paper size information collecting means may be automatically performed by a sensor, for example, or may be input in advance by a user using a keyboard or the like.
Since the presence or absence and position of the non-contact portion between the pressing roller and the paper can be specified in advance according to the paper size information, the operation of the heat generating means for that portion can be suspended in advance. Therefore, wasteful power consumption, shortened wasteful life, and wasteful control procedures can be eliminated, so that lower power consumption, longer life, and simplification of control procedures can be achieved as compared with the related art. be able to. Further, if the life is made the same as in the conventional case, the cost can be reduced. Eliminating useless control procedures can also be a factor in cost reduction.

Further, it is preferable that the apparatus further comprises means for changing the temperature control data of the control means according to the paper size information. That is, by utilizing the fact that the paper size is known in advance, the temperature of the heat generating means can be controlled by the optimal temperature control data for each paper size obtained in advance by simulation or the like. Fixing can be performed.

A second aspect of the present invention is an electrophotographic apparatus comprising the toner image fixing device of the present invention. As a result, an electrophotographic apparatus that can achieve low power consumption and long life, simplification of control procedures and cost reduction as compared with the related art, and that can fix a high quality toner image can be realized. can do.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of a toner image fixing apparatus and an electrophotographic apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a main part configuration diagram of an electrophotographic apparatus according to an embodiment of the present invention. FIG. 2 is a main part configuration diagram of a toner image fixing device according to an embodiment of the present invention.

The present invention, as shown in FIGS.
Heat roller portion 41 which is a pressing roller formed in a tubular shape
A light-emitting unit 43a to 43c as a heating unit provided in a tube of the heat roller unit 41; a thermistor sensor unit 44a to 44c as a measuring unit for measuring a surface temperature of the heat roller unit 41; Part 44
The light emitting units 43a to 43c according to the measurement results of a to 44c.
and a temperature control unit 61 which is a control unit for controlling the temperature of the light emitting units 43a to 43c, and the light emitting units 43a to 43c are provided separately in three places in the tube, and the thermistor sensor units 44a to 44c
Are the three light-emitting portions 43a to 43
3 is a toner image fixing device provided at three positions where the surface temperature of the heat roller unit 41 corresponding to 3c can be measured.

Here, a feature of the present invention is that paper size information is collected by a sensor or a keyboard input, and the heat roller unit 4 is collected in accordance with the paper size information.
1 to determine the presence or absence and position of the non-contact portion with the sheet, and according to the determination result, the light emitting section 4 related to the non-contact portion.
3i (i is any of a, b, and c) and a paper size corresponding section 63 as a means for suspending the operation of the thermistor sensor section 44i prior to the execution of fixing of the toner image.

Further, the paper size corresponding section 63 performs optimum temperature control according to various paper sizes by changing the temperature control data of the temperature control section 61 according to the paper size information.

An electrophotographic apparatus is constructed by using the toner image fixing device of the present invention as shown in FIG.

Hereinafter, embodiments of the present invention will be described in more detail.

1 and 2, a print command is issued from the control unit 60, and paper size information is sent from the paper supply unit 20 to the control unit 60. The fixing unit 4 is controlled by a command from the control unit 60.
The 0 heat roller unit 41 is heated to a constant temperature. In order to heat the heat roller unit 41, the sheet size from the sheet feeding unit 20 and the information of the thermistor sensor units 44 a, 44 b, and 44 c are adjusted by the temperature control unit 61 from the lamp control unit 62 to the inside of the lamp unit 42. Light emitting units 43a, 43
b, 43c are turned ON / OFF to control the temperature to be constant.

Here, in the present invention, the paper size corresponding section 6
3 collects paper size information by a sensor or keyboard input, and controls the heat roller unit 41 to an optimum temperature for each paper size according to the paper size information.

In this way, it is possible to keep the heat roller tube surface temperature in the fixing mechanism in the electrophotographic apparatus constant, to keep the image fixability on paper constant, and to keep the internal temperature in the apparatus constant. I do.

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. The first embodiment of the present invention includes a control unit 60 for controlling all movements of the electrophotographic apparatus, an LD unit unit 70 for forming an image, a developing unit 50 for forming an image and transferring the image to a sheet, and an image transferred to a sheet. Unit 10 including a fixing unit 40 for fixing the sheet by heat and pressure, and a discharge unit 30 for discharging the sheet, and a sheet feeding unit for storing the sheet and sending the sheet, the sheet size, and the presence or absence of the sheet to the apparatus unit 10 20.

The fixing section 40 includes a heat roller section 41, a lamp section 42 for warming the heat roller section 41, a thermistor sensor section 44a for detecting a tube surface temperature of the heat roller section 41,
44b and 44c.

The lamp section 42 includes three light emitting sections 43a, 43b, 43c in the lamp section 42. The light emitting unit 43a is arranged at the center, the light emitting unit 43b is arranged on the right side, and the light emitting unit 43c is arranged on the left side.
Are controlled independently.

The control section 60 controls the temperature of the tube surface of the heater roller section 41 to a constant temperature based on the temperature detected from the thermistor sensor section. Light emitting units 43a, 43b, 4
A lamp control unit 62 for controlling ON / OFF of 3c, a light emitting unit 43i for suspending operation before a fixing process of a toner image is determined based on paper size information, and a temperature control unit 61 is optimized for each paper size. It is assumed that a paper size corresponding unit 63 for transferring the appropriate temperature control data is included. At this time, the operation of the thermistor sensor unit 44i corresponding to the light emitting unit 43i of which the operation is suspended prior to the toner image fixing process is also suspended or the measurement result is invalidated based on the paper size information. Also,
It is assumed that sheet size information is acquired by a sensor (not shown) incorporated in the sheet feeding unit 20 and transmitted to the temperature control unit 61.

Next, the overall operation of the first embodiment will be described in detail with reference to the flowcharts of FIGS. 1, 2 and 3. First, as shown in FIG. 1 and FIG.
A temperature control command for setting the tube surface temperature at the control target temperature is issued to the temperature control unit 61. At this time, the paper size corresponding section 63
Acquires the paper size information from the sensor incorporated in the paper supply unit 20 and notifies the temperature control unit 61 of the information.

Next, as shown in FIG. 3, the paper width of the paper size information acquired from the paper supply unit 20 is A4P (210 mm).
It is determined whether it is longer (step A2). If the sheet width is longer than A4P (210 mm), since the sheet passes through the entire heat roller section 41, the temperatures of the right and left thermistor sensor sections 44b and 44c are detected (step A3).
And A6). If the control target temperature is A ° C. or more, the light emitting unit 43
b, 43c are turned off, and when it is lower than the control target temperature A ° C., the light emitting units 43b, 43c are turned on (steps A4 and A7). Next, the temperature of the thermistor sensor unit 44a is detected (step A10). If the temperature is equal to or higher than the control target temperature A ° C., the light emitting unit 43a is turned off. If the temperature is lower than the control target temperature A ° C., the light emitting unit 43a is turned on (steps A11 and A12). That is, temperature control is performed using all three light emitting units.

If the sheet width is A4P (210 mm) or less, the light emitting units 43b and 43c are turned off since the sheet does not pass through the end of the heat roller unit 41 (step A9).
Next, the temperature of the thermistor sensor unit 44a is detected (step A10). If the control target temperature is A ° C. or higher, the light emitting unit 4
3a is turned off, and when it is lower than the control target temperature A ° C., the light emitting unit 43a is turned on (steps A11 and A12).
That is, temperature control is performed only by the light emitting unit 43a. again,
The print request is confirmed, and if printing is continued, the process returns to step A2. If printing is completed, the light emitting units 43a, 43b, 43c are turned off.
FF is performed and the process ends (steps A13 and A14).

Next, a specific example will be described. As shown in FIG. 4, the paper size set in the paper feeding unit 20 is A
4P, the target print control temperature A = 150 ° C., and the temperature detected by the thermistor sensor unit 44a = 120 ° C. In response to the print request, the temperature control unit 61 acquires the paper size information and the control command for the print temperature from the paper supply unit 20 from the paper size corresponding unit 63 (step A1). Since the paper size acquired from the paper supply unit 20 matches the paper width A4P (210 mm) from A4P, the left and right light emitting units 43b and 43c are turned off, and it is determined that the control is performed only on the central light emitting unit 43a (step A2).
And A9). The current temperature 120 ° C. of the heat roller unit 41 is detected from the thermistor sensor unit 44a. A comparison is made between the detected temperature of 120 ° C. and the control target value of 160 ° C. Since the temperature does not reach the control target temperature from 160 ° C.> 120 ° C., the light emitting unit 43a is turned on and the heat roller unit 4 is turned on.
1 is warmed (steps A10 and A11). Check whether the print request has been continued.
Return to (Step A13).

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 5, the second embodiment
Lamp part 42 and light emitting parts 43a, 43 in the first embodiment
b and 43c are a lamp unit 45a and a light emitting unit 43a, a lamp unit 45b and a light emitting unit 43b, and a lamp unit 45c and a light emitting unit 43
c.

In the second embodiment, the lamp portions 45a, 45
The lamp parts b and 45c and the light emitting parts 43a, 43b and 43c were divided into three lamp parts from one described in the first embodiment. The other operations, structures, and controls are the same as those of the lamp unit 42 and the light emitting units 43a, 43b, and 43c of the first embodiment, and thus description thereof is omitted.

The overall operation of the second embodiment is different from that of the first embodiment in which one lamp section 42 has three light emitting sections, but three lamps each have a light emitting section. For this reason, the overall operation of the second embodiment is the same as the overall operation of the first embodiment, and the description is omitted.

[0036]

As described above, according to the present invention, it is possible to reduce the power consumption, extend the service life, simplify the control procedure, and reduce the cost as compared with the related art. Further, a high quality toner image can be fixed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of an electrophotographic apparatus according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram of a toner image fixing device according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the overall operation of the first embodiment of the present invention.

FIG. 4 is a diagram showing a specific example of the first embodiment of the present invention.

FIG. 5 is a main part configuration diagram of a toner image fixing device according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Device part 20 Paper supply part 30 Discharge part 40 Fixing part 41 Heat roller part 42, 45a, 45b, 45c Lamp part 43a, 43b, 43c Light emitting part 44a, 44b, 44c Thermistor sensor part 50 Developing part 60 Control part 61 Temperature control Unit 62 Lamp control unit 63 Paper size corresponding unit 70 LD unit unit

Claims (3)

[Claims]
1. A pressure roller formed in a tubular shape, a heating means provided in a tube of the pressure roller, a measurement means for measuring a surface temperature of the pressure roller, and the heat generation according to a measurement result of the measurement means. Control means for controlling the temperature of the means, wherein the heat generating means is provided at a plurality of locations in the pipe, and wherein the measuring means corresponds to the plurality of the heat generating means provided at the plurality of portions. In a toner image fixing device provided at a plurality of positions where the surface temperature of the pressing roller can be measured, a paper size information collecting unit is provided, and the presence or absence of a non-contact portion of the pressing roller with paper according to the paper size information. Means for judging the position and position of the heating means in accordance with the result of the judgment, and suspending the operation of the heating means for the non-contact portion prior to the execution of fixing of the toner image. The fixing device of toner image, comprising the.
2. A toner image fixing device according to claim 1, further comprising means for changing temperature control data of said control means in accordance with said sheet size information.
3. An electrophotographic apparatus comprising the toner image fixing device according to claim 1.
JP2000365224A 2000-11-30 2000-11-30 Fixing device for toner image and electrophotographic device Pending JP2002169408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000365224A JP2002169408A (en) 2000-11-30 2000-11-30 Fixing device for toner image and electrophotographic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000365224A JP2002169408A (en) 2000-11-30 2000-11-30 Fixing device for toner image and electrophotographic device

Publications (1)

Publication Number Publication Date
JP2002169408A true JP2002169408A (en) 2002-06-14

Family

ID=18836036

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000365224A Pending JP2002169408A (en) 2000-11-30 2000-11-30 Fixing device for toner image and electrophotographic device

Country Status (1)

Country Link
JP (1) JP2002169408A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7454146B2 (en) * 2005-03-07 2008-11-18 Lexmark International, Inc. Fuser assembly including memory
JP2012189719A (en) * 2011-03-09 2012-10-04 Seiko I Infotech Inc Image forming device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7454146B2 (en) * 2005-03-07 2008-11-18 Lexmark International, Inc. Fuser assembly including memory
JP2012189719A (en) * 2011-03-09 2012-10-04 Seiko I Infotech Inc Image forming device

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