JP2005063730A - Heating device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the lowering of temperature by a member formed by integrating a film guide member and a heating body (hereinafter referred to as a heating guide member) by an on-demand fixing method. <P>SOLUTION: A conventional guide heating member of the on-demand fixing method integrally formed by molding a heat resistant liquid crystal polymer and a linear heating element causes temperature lowering, because the heating element is arranged only at a nip part side where a transcription material passes and the heat is radiated from a guide rib part. A heating device and an image forming device according to the present invention can realize an improvement of heating efficiency and a fixing property and a stabilized temperature control or the like by preventing the lowering of temperature through the provision of the heating element at the guide rib part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a film heating method in which a material to be heated is brought into close contact with a heated body through a heat resistant film, and the heated body and the heat resistant film are relatively moved so that the heat of the heated body is applied to the heated material through the heat resistant film. And an image forming apparatus including the heating device as an image heating device.

  The film heating type heating apparatus as described above has been proposed in, for example, Patent Document 1 to Patent Document 3 and Patent Document 12 below, and includes a copying machine, a laser beam printer, a facsimile, a microfilm reader printer, an image display ( In an image forming apparatus such as a display device or a recording machine, recording is performed as an image support using toner composed of a heat-meltable resin or the like by an appropriate image forming process means such as electrophotography, electrostatic recording, or magnetic recording. Unfixed toner image (fixed image) corresponding to the target image information formed on the surface of the material (electrofax sheet, electrostatic recording sheet, transfer material sheet, printing paper, etc.) by direct or indirect (transfer) method Can be utilized as an image heating stationary apparatus for performing heat fixing processing as a permanently fixed image on the surface of the recording material carrying the image.

  Further, the present invention is not limited to the fixing device, and can be widely used as a means / device for heat-treating a material to be heated, such as a device for modifying a surface property by heating a recording material carrying an image, or a device for assumed wearing.

  Film heating type heating devices are compared with other known heating devices such as the hot roller method, hot plate method, belt heating method, flash heating method, open heating method, etc. Low heating capacity linear heating element can be used as the heating element and thin film with a low heat capacity can be used as the heating element. This makes it possible to save power and shorten the wait time (quick start), and increase the temperature inside the machine. (2) In the image heating and fixing apparatus, the fixing point and the separation point can be set separately, so that offset can be prevented, and various other disadvantages of other system apparatuses can be solved. Is effective.

(Conventional example 1)
FIG. 5A is a transverse cross-sectional model view of an example (image heating device) of a film heating type heating device, and FIG. 5B is a partially cutaway plan model view of a heating body omitted in the middle. The apparatus of this example is a heating apparatus of a so-called tensionless type film heating system disclosed in Patent Document 3 to Patent Document 11, Patent Document 12 to Patent Document 16, and the like, and a cylindrical endless film is used as a heat resistant film. The film is a device in which at least a part of the circumference of the film is always tension-free (a state in which no tension is applied), and the film is rotationally driven by the rotational driving force of a pressure roller as a pressure rotation member.

  Reference numeral 10 denotes a holder for heat-insulating and supporting a heating body 30 to be described later, and is a substantially semicircular arc-shaped laterally long member having an upward cross section, and a stay (hereinafter referred to as a stay) as a guide member on the inner surface of the film and a reinforcing member of the apparatus. Doubles as

  The heating element 30 is a horizontally long linear heating element having a low heat capacity, and is fitted into a groove 10a provided along the length on the outer lower surface of the stay 10 to be fixed and supported.

  Reference numeral 2 denotes a cylindrical heat-resistant film that is externally fitted to the stay 10 including the heating body 30. The inner peripheral length of the cylindrical heat-resistant film 2 and the outer peripheral length of the stay 10 including the heating body 30 are, for example, about 3 mm larger than the film 2. On the other hand, the outer circumference is loosely fitted with a margin.

  Reference numeral 7 denotes a flange member for receiving the film end portions disposed at the left and right end portions of the stay 10 as a film displacement control means.

  Reference numeral 8 denotes a pressure roller as a pressure rotating body that forms a pressure nip portion (fixing nip portion) N with the film 2 sandwiched between the heating body 30 and rotationally drives the film 2, and includes a metal shaft 8a and The heat-resistant rubber layer 8b having good releasability, such as silicon rubber, is arranged in such a manner that the film 2 is sandwiched with a predetermined pressing force by a bearing means / biasing means (not shown) and pressed against the surface of the heating element 30. It is. Then, a rotational driving force is transmitted by the driving means M via a power transmission system (not shown) and is driven to rotate counterclockwise as indicated by an arrow.

  A rotational force acts on the film 2 due to the frictional force between the roller 8 and the outer surface of the film 2 by the rotational driving of the pressure roller 8 (when the recording material P is introduced into the pressure nip N, the heated material P The film 2 is rotationally driven in the clockwise direction a indicated by the arrow while the film 2 is pressed against and slides on the surface of the heating body 30. The stay 10 also serving as a film inner surface guide member facilitates the rotation of the film 2. In order to reduce the sliding resistance between the inner surface of the film 2 and the surface of the heating body 30, a small amount of a lubricant such as heat resistant grease is preferably interposed between the two.

  The stay 10 is made of PPS (polyphenylene sulfide), PAI (polyamideimide), PI (polyimide), PEEK (polyetheretherketone), liquid crystal polymer, and other heat-resistant resins, and these resins and ceramics, metals, glass, etc. It can be composed of composite materials.

  The heating body 30 includes a heat-resistant film 2 or an elongated heat-resistant / insulating / high-heat-conducting heater substrate 31 whose longitudinal direction is the direction perpendicular to the conveyance direction a of the recording material P as the heated material, The energization heating resistor 4 formed along the longitudinal length of the substrate 31 at the center of the surface side of the surface 31, the power supply electrodes 41 and 41 at both longitudinal ends of the energization heating resistor 4, and the energization heating resistor 4 are provided. A linear heater with a low heat capacity as a whole, comprising a heat-resistant overcoat layer 50 that protects the surface of the formed heater, and a temperature detection element 6 such as a thermistor that detects the temperature of the heater 31 provided on the back side of the substrate 31. (Ceramic heater).

  The heating element 30 is fixedly disposed on the lower surface of the heat-resistant and heat-insulating stay 10 as described above with the surface side on which the energization heating resistor 4 is formed exposed downward.

  The heater substrate 31 is, for example, ceramic having a thickness of 1 mm, a width of 10 mm, and a length of 240 mm, such as alumina or aluminum nitride.

  The energization heating resistor 4 is formed by, for example, applying an electric resistance material such as Ag / Pd (silver palladium), RuO2, and Ta2N to a linear or narrow strip having a thickness of about 10 μm and a width of 1 to 3 mm by screen printing or the like. Formed.

  The feeding electrodes 41 and 41 are screen printing pattern layers such as Ag.

  The overcoat layer 50 is a heat-resistant glass layer having a thickness of about 10 μm, for example.

  The heating element 30 quickly rises in temperature when the energization heating resistor 4 generates heat over the entire length by feeding power to both end electrodes 41 and 41 of the energization heating resistor 4, and the temperature rise is detected by the temperature detection element 6. Then, it is fed back to a control system (not shown), and energization of the heating resistor 4 is controlled so that the temperature of the temperature detection element 6 is maintained at a predetermined set temperature during image heating.

  Film 2 has a heat resistance, releasability, strength, durability, and flexibility in a film thickness of 100 μm or less, preferably 60 μm or less and 20 μm or more in order to reduce heat capacity and improve quick start performance. Alternatively, a composite layer film can be used. For example, it is a single layer film such as PTFE, PFA, FEP or the like, or a composite layer film obtained by coating PTFE, PFA, FEP or the like on the outer peripheral surface of a film such as polyimide, polyamideimide, PEEK, PES, PPS or the like.

  An unfixed visible image (toner image) T to be fixed based on pressing of a copy button of this machine such as a copying machine or a print command signal or from an image forming process means (not shown) to the image heating apparatus is fixed. Based on a signal when the tip of the supported recording material P is detected by a sensor (not shown) disposed on the front side of the apparatus, the rotation of the pressure roller 8 is started, and the heating body 30 Heat up starts.

  The fixing nip formed by the heating body 30 and the pressure roller 8 with the film 2 sandwiched in a state where the rotational peripheral speed of the film 2 is stabilized by the rotation of the pressure roller 8 and the temperature of the heating body 30 rises to a predetermined level. A recording material P to be image-fixed as a material to be heated is introduced between the film 2 of the portion N and the pressure roller 8, and the film 2 is nipped and conveyed together with the fixing nip portion N of the heating body 30. Heat is applied to the recording material P through the film 2 and the unfixed visible image T on the recording material P is heated and fixed on the surface of the recording material P. The recording material P that has passed through the fixing nip N is separated from the surface of the film 2 and conveyed.

  The tension-less type film heating type apparatus of this example has a fixing nip portion N in the film rotation driving state, and a contact portion region between the stay outer surface portion upstream of the fixing nip portion N in the film rotating direction and the film 2. Tension acts only on the film portion, and tension does not act on the remaining most film portion. Therefore, the shift movement force along the length of the stay 10 of the film 2 in the film rotation driving state is small, and the shift movement restricting means or the film shift control means of the film 2 can be simplified. For example, the shift movement restricting means for the film 2 can be as simple as the flange member 7 for receiving the film end, and the film shift control means can be omitted to reduce the cost and size of the apparatus. .

(Conventional example 1-1)
In Patent Document 17, the guide member is made of a highly durable ceramic such as alumina, aluminum nitride, silicon nitride or the like for the purpose of eliminating the labor of bonding and assembling the heating body and the film guide member as in Conventional Example 1. For example, by applying an electric resistance material such as Ag / Pd on the guide member by screen printing or the like. A coating layer is formed.

  However, in the conventional example 1-1, since the heating body 30 and the stay 10 also serving as a film guide member that supports the heating body 30 are separate members, (1) the assembly of the heating body 30 and the stay 10 is bonded. Since it is necessary, the manufacturing process takes time. (2) Adhesive strength is insufficient, and the heating body 30 may peel off from the stay 10. There were disadvantages such as.

(Conventional example 2)
FIG. 6 is a schematic cross-sectional view of a heating device (image heating device) of Conventional Example 2 corresponding to the above-mentioned drawback. Constituent members / portions common to the apparatus shown in FIG.

  Produced by encapsulating a heating element in a film guide member, and by making the heating element and the film guide member an integrated structure, there is no bonding assembly process for both members, and there is no complicated heating element molding process The effect which becomes easy can be acquired.

  Reference numeral 60 denotes a heating guide member which is configured by integrating a heating body and a film guide member, and is a heating body itself, which is also a film guide member, and also serves as a base material for the apparatus. Hereinafter, this is referred to as a fixing stay. The fixing stay 60 is basically composed of a stay main body 60A and an energization heating resistor 5 directly formed on the stay main body 60A.

  The energizing heat generating resistor 5 is formed and encapsulated in the stay main body 60A by enclosing an electric resistance material such as nichrome along the longitudinal direction.

As described above, the heating element is enclosed in the film guide member, and the combined structure (heating guide member) 60 in which the heating body and the film guide member are integrated, thereby reducing the number of parts of the apparatus and reducing the apparatus configuration. It is possible to simplify the process and eliminate the process of screen printing a complicated heat generation pattern on the guide member, thereby facilitating the manufacture of the heating element.
JP-A-63-313182 Japanese Patent Laid-Open No. 2-157878 JP-A-4-44075 JP-A-4-44076 JP-A-4-44077 JP-A-4-44078 JP-A-4-44079 JP-A-4-44080 JP-A-4-44081 JP-A-4-44082 JP-A-4-44083 JP-A-4-204980 JP-A-4-204981 JP-A-4-204982 JP-A-4-204983 JP-A-4-204984 JP-A-6-337602

  However, in Conventional Example 2, since the energization resistance heating element 5 is disposed only in the vicinity of the fixing nip portion N, (1) the heat escapes toward the anti-nip portion (heat dissipation), and quick start performance is poor. (2) When the heated material is nipped and conveyed to the fixing nip portion N at a high speed, the temperature of the energization heating element is lowered and the productivity is deteriorated, so that the user feels uncomfortable. There are disadvantages such as.

  The present invention has been made paying attention to the above-mentioned problems, and prevents a temperature drop due to a member (hereinafter referred to as a heating guide member) in which a film guide member and a heating body are integrated by an on-demand fixing method. An object of the present invention is to provide a heating device and an image forming apparatus.

  In order to solve the above problems, the present invention comprises the following configurations (1) to (3).

(1) A heating device of a type in which a heated material is closely attached to a heated body via a heat resistant film, and heat of the heated body is applied to the heated material via the heat resistant film, In a heating apparatus having a heating guide member in which the heating body and the guide member are integrated,
The heating body is a linear heating resistor, and the heating body is disposed inside the guide member in both the vicinity of the nip portion where the material to be heated contacts the heat resistant film and the non-nip portion where it does not contact. Heating device characterized.

  (2) The heating apparatus according to (1), wherein the heating guide member is formed by pouring a heat-resistant resin into a mold in which a heating resistor is arranged in advance.

  (3) Image heating for heating the image on the recording material from the image forming means side with the image forming means for forming an image on the heated material and the image heating apparatus according to (1) or (2) above. An image forming apparatus provided as an apparatus.

  As described above, according to the present invention, in the heating device of the film heating system, the heating element is enclosed in both the fixing nip portion and the non-fixing nip portion of the film guide member, and the heating body and the film guide member are integrated. By adopting the structure, predetermined goals such as quick start performance and improved productivity can be achieved with an easy manufacturing method and stable heat supply.

  Below, the form of the discretion for implementing this invention is demonstrated, referring drawings based on an Example.

  FIG. 1A is a schematic cross-sectional view of the heating device (image heating device) of this embodiment. FIG.1 (b) is a cross-sectional model figure of the heating body of the heating apparatus (image heating apparatus) of a present Example. Constituent members / portions common to the apparatus shown in FIG. 5 and FIG.

  Reference numeral 1 denotes a heating guide member which is formed by integrating a heating body and a film guide member, and is a heating body itself, which is also a film guide member, and also serves as a base material for the apparatus. Hereinafter, this is referred to as a fixing stay. The fixing stay 1 is basically composed of a stay main body 1A and energization heating resistors 5c, 5b, and 5a directly formed on the stay main body 1A.

  The stay main body 1A is a substantially semicircular arc-shaped horizontal elongated member having a transverse cross-section upward like the stay 60 of the apparatus of FIG. 6, and functions as an inner surface guide member of the film 2, a reinforcing member of the apparatus, and as a heating body. In order to function, the stay main body 1A is formed by using a high heat-resistant resin such as PPS (polyphenylene sulfide), PAI (polyamideimide), PI (polyimide), PEEK (polyetheretherketone), or liquid crystal polymer as its material. It is.

  The energization heating resistors 5a, 5b, and 5c are formed and encapsulated within the stay main body 1A by enclosing an electrical resistance material such as nichrome along the longitudinal direction.

  Three energization heating resistors 5c are arranged in the vicinity of the fixing nip portion N where the heated material P contacts the fixing film 2, at a distance of d3 from the end surface of the fixing nip portion N of the stay 1, at an interval of d5b. . One energization heating resistor 5b is arranged at an angle of θ1 and θ2 respectively from the vertical direction of the center of the stay 1 to the counterclockwise direction from the plane of the heated material P. The energization heating resistor 5b is centered on the position d2 from the end face of the stay 1 in the direction of the fixing film 2. Further, one energization heating resistor 5a is disposed at an angle of θ3 and θ4 in the counterclockwise direction. The energization heating resistors 5a and 5b are centered on the position d2 from the end face of the stay 1 in the direction of the fixing film 2. The width of stay 1 was d0.

  FIG. 7 shows the temperature transition of the energization heating resistor when power is supplied to the heating element from room temperature. In general, the greater the temperature transition gradient, the faster the quick start and the more convenient for the user.

  In this experiment, the measurement was carried out with three patterns, pattern B, which is a combination of patterns C, 5c and 5b, and pattern A, which is a combination of 5c, 5b and 5a. The experimental conditions were a low-temperature and low-humidity environment, and the power per heating resistance heating element was 100 W. The temperature was measured in real time by providing a thermocouple near the fixing nip N. In addition, the positions of the respective energization heating resistors were set to the same 2 mm in all of the distances d1, d2, and d3 from the end surface of the fixing stay 1 in the fixing film 2 direction. Also, θ1 was 30 °, θ2 was 15 °, θ3 was 15 °, and θ4 was 15 °. The energization heating resistor 5c interval d5c is 4 mm, and the fixing stay width is 10 mm. The diameter of each energization heating resistor is the same as 3 mm.

  As a result, the pattern C of Conventional Example 2 required 24 seconds to reach the target temperature of 130 ° C. On the other hand, the pattern B reaches the target value in 19 seconds and the pattern A reaches the target value in 14 seconds. Compared to the pattern C in which the energization heating resistor is only in the vicinity of the fixing nip N, the non-fixing nip portion, for example, the pattern B or pattern A having the energization heating resistor in the position of 5b or 5a, There is much supply of heat. Therefore, in order to improve the quick start performance, it can be said that a means for providing a heating element not only in the fixing nip portion but also in the non-fixing nip portion is effective.

  FIG. 8 shows the temperature transition of the heated material P when the heated material P is nipped and conveyed to the fixing nip portion N. In general, when the heated material P is nipped and conveyed through the fixing nip portion N, the amount of heat of the heated body is deprived by the heated material P, and the temperature of the heated body decreases. Then, for example, when a developer or the like is applied on the heated material P, the developer cannot be fixed to the heated material P. Therefore, the temperature detection element 6 is controlled to give a sufficient amount of heat so that the temperature of the heating body does not decrease. However, when the heated material P is passed at high speed or when the heated material P such as cardboard has a large heat capacity, there are cases where the amount of heat supplied is insufficient. In general, the current situation is that the nipping and conveying speed of the heated material P is lowered to cope with it (hereinafter referred to as a down sequence). In the down sequence, since the material to be heated is not nipped and conveyed at a normal speed, the productivity is lowered and the user is uncomfortable.

  In the experiment of FIG. 8, three patterns A, B, and C were carried out in the same environment and under the same conditions as in FIG. The temperature of the material P to be heated was measured in real time by installing a non-contact infrared temperature measuring device at a position 50 mm downstream from the fixing nip N. When the target temperature of the temperature detecting element 6 is 130 ° C., the target surface temperature of the material P to be heated is about 70 ° C. Further, the material P to be heated was A4 size, and the paper was fed at a rate of 30 sheets per minute and at a speed of 200 mm / sec.

  As a result, the pattern C of Conventional Example 2 can be held at 60 ° C. or higher for about 10 seconds. On the other hand, the pattern B is held for 24 seconds, the pattern A is held for 30 seconds, and about 3 times. This is because the amount of heat supplied to the material to be heated P is increased by arranging the heating element in the non-fixing nip portion in addition to the vicinity of the fixing nip portion N. The heating element in the non-fixing nip portion supplies heat to the fixing stay 1 and the fixing film 2 and before the heated material P is nipped and conveyed to the fixing nip portion N, air in the atmosphere is supplied to the heated material P. It is because it has a role which supplies heat through. According to the detection result (not shown) of the temperature detecting element 6 simultaneously with this experiment, the temperature of the fixing nip N when the temperature of the heated material P is below 70 ° C. is 125 ° C. which is lower than the target temperature of 130 ° C. Met. That is, it can be said that the temperature of the fixing nip portion N can be lowered by arranging the heating element in the non-fixing nip portion. This is the same principle as the preheating of the conventional example (not shown).

  Conventional preheating (for example, Japanese Patent Application Laid-Open No. 5-46036) generally supplies radiant heat or heat by a plurality of heating devices to a place away from the fixing nip portion. I need a heat source. In this embodiment, by integrating the heat source for preheating with the stay, there is an advantage that extra wiring and parts can be reduced and heat can be supplied to the fixing nip portion.

  Although not shown in the drawing, as the conveying speed of the heated material P is increased, the time during which the heated material P receives heat immediately before the fixing nip portion N and the fixing nip portion N decreases. It is clear that the supply amount will greatly influence.

  The detection temperature of the temperature detection element 6 is fed back to a control circuit (not shown), and energization of the energization heating resistors 5a and 5b is performed so that the detection temperature of the temperature detection element 6 is maintained at a predetermined set temperature during image heating. Is controlled.

  As described above, the heating element is enclosed in both the fixing nip portion and the non-fixing nip portion of the film guide member, and the heating body and the film guide member are integrated into a combined structure (heating guide member). By making it easy and supplying a sufficient amount of heat efficiently, quick start performance and productivity can be improved.

  The specific numerical values described in this embodiment are merely examples, and it is desirable to derive optimum conditions in each case.

  FIG. 2 is a diagram illustrating the manufacturing process of the stay 1 in the first embodiment. 203 is a mold for forming the stay 1, and PPS (polyphenylene sulfide), PAI (polyamideimide), PI (polyimide), PEEK (polyetheretherketone), liquid crystal polymer and the like are injected into the mold 203 from the injection nozzle 202. A stay 1 is formed by pouring high heat-resistant resin.

  At that time, a linear current-carrying resistance heating element 201 such as nichrome is arranged in the mold 203 in advance along the longitudinal direction, and the aforementioned high heat resistance resin is poured into the mold 203. After cooling, the mold 203 is removed when the temperature reaches a predetermined temperature, whereby the stay 1 enclosing the energization resistance heating element 201 is formed as shown in FIG.

  As a result, it is possible to mold the stay without performing the process of screen-printing a complicated heat generation pattern or overcoat layer on the stay by integrally molding the heating body and the film guide, which are conventionally separate. .

  FIG. 4 shows a schematic configuration of an example of an image forming apparatus incorporating an image heating apparatus A as a film heating type heating apparatus according to the present invention as shown in the first embodiment. The image forming apparatus of this example is an electrophotographic copying apparatus of a platen reciprocating type, a rotating drum type, a transfer type, and a process cartridge attaching / detaching type.

  100 is an apparatus machine 101, 101 is a reciprocating type document placing table made of a transparent plate member such as a glass plate disposed on the upper surface plate 102 of the apparatus machine. It is driven to reciprocate at a predetermined speed in each of the direction a and the left side a ′.

  G is a document, which is set by placing it on the upper surface of the document placing table 101 according to a predetermined placement standard with the image surface side to be copied facing down, and placing the document crimping plate 103 thereon and pressing it down. .

  Reference numeral 104 denotes a slit opening serving as a document illuminating unit that is opened on the surface of the machine upper surface plate 102 with a direction perpendicular to the reciprocating direction of the document placing table 101 (a direction perpendicular to the paper surface) as a longitudinal direction.

  The downward image surface of the document G placed and set on the document table 101 passes through the position of the slit opening 104 sequentially from the right side to the left side in the forward movement process of the document table 101 to the right side a. In the course of the passage, the light L of the lamp 105 is received and scanned through the slit opening 104 and the transparent document table 101, and the reflected light on the document surface of the scanned illumination light is applied to the surface of the photosensitive drum 107 by the image element array 106. Imaging exposure is performed.

  The photosensitive drum 107 is coated with a photosensitive layer such as a zinc oxide photosensitive layer or an organic semiconductor photosensitive layer, and is driven to rotate in a clockwise direction indicated by an arrow b at a predetermined peripheral speed around the central support shaft 108. The charger 109 was subjected to uniform positive or negative charging treatment, and the uniform charged surface was subjected to imaging exposure (slit exposure) of the original image, whereby the photosensitive drum 107 surface was subjected to imaging exposure. An electrostatic latent image corresponding to the document image is sequentially formed.

  The electrostatic latent image is successively visualized with toner made of resin or the like that is softened and melted by heating by the developing device 110, and the toner image as the visualized image is transferred to an arrangement site of the transfer discharger 111 as a transfer portion. I will do it.

  S is a cassette in which transfer material sheets P as recording materials are stacked and stored, and the sheets in the cassette are fed and fed to one sheet by the rotation of the feeding roller 112, and then on the drum 107 by the registration roller 113. When the leading edge of the toner image forming unit reaches the site of the transfer discharger 111, the leading edge of the transfer material sheet P also reaches the position between the transfer discharger 111 and the photosensitive drum 107 and is timed so as to coincide with each other. Synchronously fed.

  Then, the toner image on the photosensitive drum 107 side is sequentially transferred onto the surface of the feeding sheet by the transfer discharger 111.

  The sheet that has received the toner image transfer at the transfer unit is sequentially separated from the surface of the photosensitive drum 107 by a separation unit (not shown), and is guided to the fixing device A by the conveying device 114 to heat the unfixed toner image carried thereon. Upon receiving the fixing, the sheet is discharged as an image formed product (copy) through a discharge roller 116 onto a discharge tray 117 outside the apparatus.

  After the image transfer, the surface of the photosensitive drum 107 is repeatedly used for image formation after being subjected to removal of adhering contaminants such as transfer residual toner by the cleaning device 118.

  The PC is a process cartridge that is attached to and detached from a cartridge attaching / detaching unit 120 in the apparatus main body 100. In this example, the four processes of the photosensitive drum 107, the charging device 109, the developing device 110, and the cleaning device 118 serving as an image carrier. It is possible to attach and detach and replace the apparatus main body 100 in a lump with the devices included.

Sectional drawing of the heating apparatus of Example 1 Sectional drawing of the heating body of the heating apparatus of Example 1. Production method schematic of Example 2 Schematic of the stay manufactured according to Example 2 Schematic of the image forming apparatus of Example 3 (A) Sectional view of the apparatus of Conventional Example 1 of the heating apparatus of the film heating system, (b) Omitted part of the heating body, partially cutaway plan view Sectional drawing of the apparatus of the prior art example 2 of the easy manufacturing film heating type heating apparatus The figure which shows the temperature transition (at the time of normal temperature) of the heating apparatus of Example 1. The figure which shows the temperature transition (at the time of temperature stabilization) of the heating apparatus of Example 1.

Explanation of symbols

A Fixing device G Document L Light M Driving means N Fixing nip P Recording material (heated material, transfer material sheet)
PC process cartridge S Cassette 1 Heating guide member (fixing stay)
1A stay main body 2 heat resistant film 4 energization heating resistor 5, 5a, 5b, 5c energization heating resistor 6 temperature detection element 7 film end regulating flange (flange member)
8 Pressure roller 8a Metal shaft 8b Heat-resistant rubber layer 10 Stay 10a Groove 30 Heating body 31 Heater substrate 41 Power supply electrode 50 Heat-resistant overcoat layer 60 Fixing stay 60A Stay main body 100 Image forming apparatus machine housing (apparatus body)
101 Document Placement Table 102 Machine Housing Top Plate 103 Document Crimping Plate 104 Slit Opening (Document Illumination Unit)
105 Lamp 106 Image Element Array 107 Photosensitive Drum 108 Center Support Shaft 109 Charging Device 110 Developing Device 111 Transfer Discharge Device 112 Feeding Roller 113 Registration Roller 114 Conveying Device 116 Discharging Roller 117 Discharging Tray 118 Cleaning Device 120 Cartridge Removable Unit 201 Current Resistance Heating element 202 Injection nozzle 203 type

Claims (3)

It is a heating device of a system in which a material to be heated is closely attached to a heating body via a heat resistant film, and heat of the heating body is applied to the material to be heated via a heat resistant film, and has a guide member for the heat resistant film, In the heating apparatus having a heating guide member in which the heating body and the guide member are integrated,
The heating body is a linear heating resistor, and the heating body is disposed inside the guide member in both the vicinity of the nip portion where the material to be heated contacts the heat resistant film and the non-nip portion where it does not contact. Heating device characterized.   The heating apparatus according to claim 1, wherein the heating guide member is formed by pouring a heat-resistant resin into a mold in which a heating resistor is previously arranged.   3. An image forming unit that forms an image on a heated material; and the image heating device according to claim 1 or 2 as an image heating device that heats an image on the recording material from the image forming unit side. An image forming apparatus.

Images