JPH11109778A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oil from leaking outside of a fixing device, for preventing the oil from sneaking into an unintended mechanical part by providing, for instance, a releasing agent leakage preventing means for preventing leakage, that is, a releasing agent discharged from the respective discharge holes of a supplying nozzle from flowing down on the surface of the nozzle. SOLUTION: The supplying nozzle 43 is provided with a difference in bending step 70, in the base part on the side of a supplying port 66, of the nozzle 43, as the releasing agent leakage preventing means. Even if the whole of the fixing device is inclined to level or the nozzle 43 is inclined for some reason, in discharging the oil 44 from the discharge holes 68 provided in the surface of the nozzle 43, the oil 44 drops as a droplet. But, the oil remaining after the discharge flows downward on the surface of the nozzle 43, in comparison with the level case. The flowing down oil 44 reaches the part of the difference in bending level 70, but the oil 44 does not flow down more than that, so that the leakage of the oil to the outside of the fixing device never occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device provided in an image forming apparatus such as an electrophotographic printer or a copying machine, and more particularly to a fixing device for fixing an image to a rotating body for heat and pressure fixing. The present invention relates to a fixing device provided with a mechanism for applying a release agent.

[0002]

2. Description of the Related Art Printers using an electrophotographic process,
2. Description of the Related Art An image forming apparatus such as a copying machine includes a fixing device for fixing an unfixed toner image held on a sheet as a recording medium. There are various fixing systems,
Generally, a pressure heating fixing method is widely used.

[0003] A fixing device based on this pressure heating fixing system,
The fixing roller and the pressure roller are arranged to face each other, and a tubular heating heater such as a halogen lamp is arranged, for example, on the center axis of the fixing roller. The heat generated from the halogen lamp is uniformly radiated to the inner wall of the fixing roller, and the temperature distribution on the outer wall of the fixing roller becomes uniform in the circumferential direction. The outer wall of the fixing roller is heated until its temperature reaches a temperature suitable for fixing (for example, 150 to 200 ° C.). In this state, the fixing roller and the pressure roller rotate in opposite directions while being pressed against each other, and sandwich the sheet holding the toner.
At the nip where the fixing roller and the pressure roller are pressed against each other, the unfixed toner on the sheet is melted by the heat conducted from the fixing roller, and the pressure acting on both rollers is further applied to be fixed on the sheet.

The fixing device using the pressure heating fixing method has a configuration in which the surface holding the toner among the two surfaces of the sheet is in direct contact with the surface of the fixing roller. Easy to be transferred to For this reason, a so-called offset phenomenon occurs in which the toner fused to the fixing roller is transferred again to the rear end of the sheet to stain the sheet, or is transferred again to the next conveyed sheet to stain the sheet. There is a disadvantage that it is easy. Therefore, a fixing device using a pressure heating fixing method has a mechanism for applying a release agent for preventing offset to a fixing roller. As the release agent, silicone oil (hereinafter, also simply referred to as “oil”) is used.

The conventional oil application mechanism includes an oil tank that stores oil and extends along the axial direction of the fixing roller, and a felt or roller that is disposed so as to be immersed in the oil in the oil tank. There is a type in which oil is supplied to an oil application roller in contact with a fixing roller in a planar manner through the felt or the like (Japanese Patent Publication No. 61-1986).
No. 10069). However, since such an oil application mechanism stores a large amount of oil in an opened oil tank, oil spills easily occur, and oil stains easily occur.

Further, if the image forming apparatus itself is vibrated or installed at an angle, the fixing device and eventually the oil application mechanism also vibrate or incline, and this also tends to cause oil spillage. Furthermore, in the oil application mechanism that supplies oil to the oil application roller in a planar manner, it is difficult to make the amount of oil applied to the fixing roller uniform along the axial direction of the fixing roller, and image noise such as oil streaks occurs. There was a problem that it was easy.

Therefore, in recent years, an oil application mechanism has been proposed in which a plurality of oil discharge holes are provided in a supply nozzle so that oil is supplied to an oil application roller in the form of dots of liquid droplets (Japanese Patent Laid-Open No. Hei 6 (1994) -108). JP-A-274061, JP-A-7-
No. 210025). In a mode in which oil is supplied using a nozzle, a closed-type oil tank can be used, so that oil spillage from the tank can be prevented. Also, by adjusting the operation time of the oil pump, the oil supply can be set arbitrarily from a small amount to a large amount.
There is also an advantage that the range of oil supply can be widened.

[0008]

In the configuration having the supply nozzle provided with the oil discharge hole as described above, if the supply nozzle is inclined, the oil remaining around the discharge hole after the oil is discharged will not be supplied to the supply nozzle. It travels down the slope along the surface, together with the oil remaining around the other discharge holes, and eventually reaches the lower end of the supply nozzle. The oil collected at the end of the supply nozzle leaks out of the fixing device and stains the hands and clothes of the operator, or the oil enters other unspecified mechanism parts, and the stains on the mechanism parts are removed. There is a problem that occurrence occurs.

Therefore, the present invention prevents excess oil from entering into a mechanism part other than a predetermined part, and preventing oil from leaking to an unintended part. Accordingly, it is an object to provide a fixing device capable of preventing oil from sneaking into an unintended mechanism even if the nozzle is tilted.

[0010]

According to the first aspect of the present invention, there is provided a rotating body for fixing a toner image held on a sheet by heat and pressure, and an axial direction of the rotating body. A coating means extending along the axis and applying a release agent to the rotating body; a supply nozzle extending along the longitudinal direction of the application means and supplying the release agent to the application means from a plurality of discharge holes. And a release agent leakage preventing unit for preventing the release agent discharged from each of the discharge holes of the supply nozzle from leaking down the surface of the supply nozzle.

The release agent leakage preventing means is formed into a shape having an effect of preventing advancing of the transmitted and flowing oil by providing a bending step in the supply nozzle.

Further, the release agent leakage preventing means is provided with an oil dripping prevention muffler in the supply nozzle, so as to have an effect of preventing the progress of the release agent flowing down.

According to a second aspect of the present invention, there is provided a rotating member for fixing a toner image held on a sheet by heat and pressure, and a release agent extending along the axial direction of the rotating member and provided on an outer periphery of a core member. Coating means provided with a holding member for holding the coating agent, a supply nozzle arranged inside the core member of the coating means and supplying the release agent to the coating means, and the release discharged from the supply nozzle A fixing device comprising: a release agent leakage preventing unit configured to prevent leakage of an agent flowing down the inner surface of the core member.

The release agent leakage preventing means has a structure in which an oil leakage preventing flange is provided at the opening end of the cored bar to prevent the flow of oil flowing down the inner surface.

According to a third aspect of the present invention, there is provided a rotating body for fixing a toner image held on a sheet by heat and pressure, and a holding member extending along the axial direction of the rotating body and holding a release agent. Coating means for applying the release agent to the rotating body via a supply nozzle, a supply nozzle for supplying the release agent to the application means, and the release agent discharged from each of the discharge holes of the supply nozzle Is a release agent preventing means for preventing the release agent from leaking along the longitudinal direction of the holding member by flowing down the outer surface of the application means.

The release agent leakage preventing means has a structure in which an oil leakage preventing flange is provided on the outer surface of the metal core to prevent oil flowing down the outer peripheral surface.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a fixing device according to the first embodiment.

The illustrated fixing device 100 is of a pressure heat fixing type, and is incorporated in an image forming apparatus such as a printer having a known electrophotographic image forming means. The fixing device 100 includes a fixing roller 20 provided rotatably in the direction of arrow a, a pressure roller 30 provided in pressure contact with the fixing roller 20, and driven to rotate with the rotation of the fixing roller 20. Heaters 21 and 31 for heating the rollers 20 and 30 and an oil applying mechanism 40 for applying a release agent for preventing offset to at least one of the rollers (the fixing roller 20 in the illustrated example) are provided. The fixing roller 20 and the pressure roller 30 correspond to a rotating body for fixing the toner 11 held on the sheet 10 by heat and pressure. As the release agent, silicone oil is used.

The fixing roller 20 is a hollow metal pipe 2
2 is a roller in which the outer peripheral surface is coated with silicone rubber and a release layer 23 having good release properties and heat resistance to toner is formed. On the central axis of the fixing roller 20, a tubular heating heater such as a halogen lamp 21 is arranged.
The fixing roller 20 has a driving gear (not shown) fixed to one end thereof, and is driven to rotate by a driving source (not shown) such as a motor connected to the driving gear.

The pressure roller 30 is a hollow metal pipe 3
2, a roller provided with a silicone rubber layer 33 on the outer periphery thereof, and the halogen lamp 31 is arranged on the center axis of the roller. The silicone rubber layer 33 is a rubber layer having releasability from which the sheet 10 is easily separated from the surface and having heat resistance. The pressure roller 30 is pressed in a direction toward the fixing roller 20 by a spring material (not shown).
When the toner can be sufficiently fixed only by the halogen lamp 21 built in the fixing roller 20, the pressure roller 3
The 0-side halogen lamp 31 may be omitted.

In the fixing operation, first, a predetermined voltage is applied to the halogen lamps 21 and 31, and the radiant heat generated from the halogen lamps 21 and 31 causes the outer wall temperatures of the fixing roller 20 and the pressure roller 30 to be fixed. Heat to the appropriate temperature. The sheet 10 holding the unfixed toner 11 is conveyed from the right as indicated by an arrow b in FIG. 1 and is sent toward a nip 12 which is a contact portion between the fixing roller 20 and the pressure roller 30. Sheet 1
0 is conveyed while being nipped by the nip portion 12 while the heat from the fixing roller 20, the heat from the pressure roller 30, and the pressure applied from the pressure roller 30 are applied. As a result, the unfixed toner 11 is fixed on the sheet 10. The toner 11 is held on the side of the sheet 10 that contacts the fixing roller 20. The sheet 10 that has passed through the nip portion 12 is naturally separated from the fixing roller 20 by a curvature according to the strength of the sheet 10 itself, and is conveyed leftward in FIG. The sheet 10 is conveyed by a discharge roller (not shown) and discharged onto a discharge tray (not shown).

Next, the configuration of the oil application mechanism 40 will be described.

The oil application mechanism 40 extends along the axial direction of the fixing roller 20 and supplies oil to the fixing roller 2.
The coating unit 41 includes a supply nozzle 43 that extends along the longitudinal direction of the coating unit 41 and supplies oil to the coating unit 41 from a plurality of discharge holes 68. As shown in FIG. 2, the oil application mechanism 40 further includes a closed oil tank 45 for holding oil 44.
And an oil conveying means 46 for feeding the oil 44 stored in the oil tank 45 to the supply nozzle 43.

The coating means 41 of the present embodiment includes an oil coating roller 50 which is disposed on the sheet carrying side of the fixing roller 20 and is in pressure contact with the fixing roller 20, and an oil supply roller 53 which is in pressure contact with the oil coating roller 50. It has. The oil application roller 50 is a roller having a silicone rubber layer 52 provided on the outer periphery of a metal pipe 51 as shown in FIG.

As shown in FIG. 2, the oil supply roller 53 is a roller in which an outer periphery of a cylindrical metal core 55 having a plurality of through holes 54 is covered with an oil impregnating material 56. The supply nozzle 43 is disposed on the shaft in a non-rotating state. The through holes 54 are small holes having a predetermined diameter and are formed at substantially equal intervals. This through hole 54
The inner and outer surfaces of the cored bar 55 communicate with each other via. The oil impregnating material 56 is formed of a porous material such as sponge, paper, felt, and silicone rubber. The oil 44 supplied from the supply nozzle 43 to the inner surface of the core bar 55 passes through the through hole 54 of the core bar 55, reaches the outer surface of the core bar 55, and impregnates the oil impregnating material 56.

The oil application roller 50 is supported so as to be able to rotate with the rotation of the fixing roller 20, while the oil supply roller 53 is supported so as to be able to rotate with the rotation of the oil application roller 50. By such a rotation, the oil 44 supplied from the supply nozzle 43 is transmitted from the oil impregnating material 56 of the oil supply roller 53 to the oil application roller 50, and from the oil application roller 50 to the outer periphery of the release layer 23 of the fixing roller 20. Applied to the surface.

As shown in FIG. 1, the oil application roller 50
Is in contact with an oil regulating blade 57 for removing oil not applied to the fixing roller 20. The oil regulating blade 57 has a length substantially equal to the axial length of the oil application roller 50. Oil regulating blade 5
7 is received by an oil pan 58 and is passed through an oil tank 45 via a recovery path (not shown).
Is returned to.

Since the oil tank 45 is of a closed type, no oil spills even when a large amount of oil 44 is stored, and no oil spills even when vibration is applied or inclined.

As shown in FIG. 2, the oil transfer means 46 includes an oil pump 60, a tube 61 having one end connected to the oil pump 60 and the other end immersed in the oil 44 in the oil tank 45, and one end connected to the oil pump 45. Tube 62 connected to oil pump 60 and the other end connected to supply nozzle 43
And is composed of

The supply nozzle 43 has a pipe 65 made of stainless steel or the like, and a supply hole 66 is formed by opening one end of the pipe 65. A plurality of discharge holes 68 are formed in the pipe 65 at a predetermined pitch, and these discharge holes 68 allow the oil 44 to drop to a position below the discharge holes.

In particular, the present embodiment relates to a release agent leakage preventing means for preventing the release agent discharged from each of the discharge holes of the supply nozzle from flowing down the surface of the supply nozzle and flowing down. .

The supply nozzle 43 of the present invention shown in FIG.
Is a supply port 66 as the release agent leakage preventing means.
A bending step 70 is provided at the base on the side, and the bending step 70 is located inside the oil supply roller 53.

When the oil 44 is discharged from the discharge hole 68 provided on the surface of the supply nozzle 43, the fixing device 1
The whole 00 is inclined by θ ゜ shown in the figure with respect to the horizontal,
Even if the supply nozzle 43 is inclined for some reason, the oil 44 drops droplets. However, compared with the horizontal case, the oil remaining after the discharge is
Flow downwards.

The flowing oil 44 eventually reaches the bent step 70 and stops without flowing further downward. Since the oil 44 cannot flow before the bent step 70, no oil leaks outside the fixing device.

The bending angle of the bending step 70 is not limited to a right angle as shown in FIG. 4A, but may be another angle shown in FIG. 4B or a corner portion shown in FIG. The flow path resistance inside the nozzle may be reduced by adopting a rounded shape or the like.

FIG. 5 shows an oil supply nozzle 4.
3 not only at the base but also at the tip
Is provided. By providing the bent steps 70 at both ends of the supply nozzle 43 in this manner, the flow of the oil 44 leaking to the outside through the surface of the supply nozzle 43 is prevented even if the supply nozzle 43 is inclined to the left or right as viewed in the drawing. can do. In particular, the effect of such an embodiment is a very effective means when using a cored bar 55 whose both ends are open. In addition, by supporting both ends of the supply nozzle 43 with the support members 83, the supply nozzle 43 is preferably positioned inside the cored bar 55.

In the following, another embodiment of the means for preventing leakage of the release agent of the present invention is shown. In the same manner as in the previous embodiment, the release agent discharged from each of the discharge holes of the supply nozzle is used. The present invention relates to a release agent leakage preventing means for preventing leakage flowing down the surface of a supply nozzle.

FIG. 6 shows this embodiment. In this figure, at the base of the supply nozzle 43, an oil dripping prevention muffler 71 as a release agent leakage prevention means is provided. In this case, the oil 44 from each discharge hole 68 of the supply nozzle 43
Of the discharge amount, a sufficient blocking effect is exerted on the oil 44 which is transmitted along the surface of the supply nozzle 43 without leaking to the outside. The transmitted oil 44 reaches the oil dripping prevention muffler 71 and stops traveling without being able to get over the oil dripping prevention muffler 71. This prevents the oil 44 from leaking out of the fixing device.

As shown in FIG. 7, the supply nozzle 43 can be inverted around the axis thereof by an inversion mechanism (not shown) so that the discharge hole 68 is directed upward when the oil 44 is not discharged. When the fixing device operates, it can be ejected downward. Accordingly, it is possible to effectively prevent the remaining oil 44 in the supply nozzle 43 from leaking out even when the fixing device is stopped, resulting in excessive supply, and is more preferable in combination with the oil dripping prevention muffler 71. Oil leakage prevention means can be provided.

As described above, as an embodiment of the release agent leakage preventing means for preventing the release agent discharged from each of the discharge holes of the supply nozzle from flowing down the surface of the supply nozzle, the folding step An example of the muffler 70 and the oil dripping prevention muffler 71 has been described. However, these embodiments are not limited to those in which the supply nozzle 43 is applied inside the cored bar 55, and can be applied as oil leakage prevention means of the supply nozzle 43 provided outside the oil supply roller 53. .

On the other hand, the release agent leakage preventing means shown in FIGS. 8 and 10 (a) is a release agent for preventing the release agent discharged from the supply nozzle from leaking down the inner surface of the core member. This is a means for preventing agent leakage.

In particular, according to the present embodiment, when compared with the bending step 70 and the oil dripping prevention muffler 71 of the above two examples, the difference is that the oil supply roller 53 has oil leakage as a release agent leakage prevention means. It is at the place where the prevention collar 72a is provided.

The oil leak preventing flange 72a has an effect of preventing the oil 44 oozing from the end of the inner peripheral surface from leaking to the outside. This oil leakage prevention collar 72a
Reaches the point where the oil 44 has reached, and does not leak out from the oil supply roller 53 to the outside.

FIG. 9 shows an example in which an oil dripping prevention muffler 71 is used in combination with a metal core 55 having an oil leakage prevention flange 72a provided at an end. Here, the diameter of the opening of the cored bar 55 is indicated by h, and the diameter of the oil dripping prevention muffler 71 is indicated by H. When assembling the structure of this embodiment, it is necessary to install an oil dripping prevention muffler 71 in the bore of the cored bar 55.
Therefore, since the relationship of H> h is satisfied, by using an elastic body as a material of the oil dripping prevention muffler 71, the oil dripping prevention muffler 71 is deformed and passes through the opening h so that the oil dripping prevention muffler 71 is inserted into the core metal 55. It can penetrate the cavity.

The oil dripping prevention muffler 71 blocks the oil 44 transmitted on the surface of the supply nozzle 43, and has an effect of promoting the growth of droplets. Eventually, the grown droplets drop onto the oil supply roller 53 and are effectively applied to the fixing roller 20. The oil dripping prevention muffler 71 may be provided with a certain clearance with respect to the inner peripheral surface of the cored bar 55, and the same effect can be obtained even when the muffler 71 comes into contact with the same. Oil 44 when contacting the inner peripheral surface
Is continuously supplied to the oil supply roller 53 without observing the growth of the droplets.

FIG. 10 (b) shows an embodiment in which the core metal 55 is open at both ends. Oil leakage prevention flanges 72a are provided at both ends of the opening to prevent the oil 44 from flowing out. It is blocking.

In order to achieve the same effect as the oil leakage prevention flange 72a, a bearing 82 shown in FIG. 10C can be used instead of the oil leakage prevention flange 72a. In this case, the configuration is such that the supply nozzle 43 is used as a rotation shaft of the oil supply roller 53. The supply nozzle 43 is inserted into the inner ring of the bearing 82, and the outer ring is
Is fixed by being inserted into the inner circumference of the. The inner ring and the outer ring have the same effects as the oil leakage prevention flange 72a.

FIG. 10D shows a modification of the oil leakage prevention flange 72a shown in FIG. In this example, an oil dripping prevention sleeve 80 is provided continuously to the end of the oil leakage prevention flange 72a, and blocks the flow of the oil 44 traveling along the inner peripheral surface of the cored bar 55 toward the open end. Further, the oil 44 oozing out from the end of the oil impregnating agent 56 similarly reaches the outer surface of the oil dripping prevention sleeve 80 and is prevented from advancing. In addition,
A rotating shaft 81 is provided at an end of the cored bar 55 and functions as a rotating shaft when the oil supply roller 53 rotates.

FIG. 11 shows that the release agent discharged from each of the discharge holes of the supply nozzle flows down the outer surface of the applying means and leaks from the end along the longitudinal direction of the holding member. 1 shows an embodiment of a release agent leakage preventing means for preventing leakage.

The release agent leakage preventing means includes an oil leakage preventing flange 72b similar to the oil leakage preventing flange 72a shown in FIG.
Is combined with the outer end of the oil leakage prevention collar 72a. In this way, the bleeding of the oil 44 from the outer peripheral surface of the cored bar 55 and the oil impregnating agent 56 can be effectively prevented. Further, the axial length of the oil impregnating material 56 on the surface of the oil supply roller 53 is set longer than the axial length of the oil application roller 50. Due to this dimensional relationship, the oil 44 can be uniformly applied to the surface of the oil application roller 50.

As described above, the release agent discharged from each of the discharge holes of the supply nozzle flows down the outer surface of the coating means and flows down, thereby preventing the release agent from leaking from the end along the longitudinal direction of the holding member. As an embodiment of the prevention means,
An example of the oil leakage prevention collar 72a has been described. However, these embodiments are not limited to the one in which the supply nozzle 43 is applied to the inside of the core 55, and the oil supply roller 53
The same can be applied as a means for preventing oil leakage.

FIGS. 12 (a) to 12 (c) show the rotary shaft structure of the oil supply roller 53 of the fixing device according to the present invention, for improving workability when the oil supply roller 53 is replaced. Things.

FIG. 12A shows a case where the outer peripheral surface of the oil supply roller 53 is designed as a rotation axis. The oil supply roller 53 is positioned on the main frame 77 by the plate 73, and is driven by the oil application roller 50. Oil 44
Supply. By removing the fixing screw 78 fixing the plate 73 in such a configuration, the oil supply roller 53 can be removed.

Similarly, in FIG.
The oil supply roller 53 can be removed by removing the plate 74 that has been positioned by pressing the oil supply roller by similarly removing the fixing screw 78.

FIG. 12 shows a structure for performing the above-described series of operations for replacing the oil supply roller 53 more smoothly.
(C) shows the routing of each tube. The tube 62 is connected to the variable section 76 by a tube joint 79. The variable portion 76 is pulled out together when the oil supply roller 53 is taken out from the main body of the fixing device. Next, after the tube 62 is pulled out to a position where a sufficient workable space can be secured, the tube 62 and the variable portion 76 are separated at the tube joint 79. Alternatively, the tube may be separated between the oil supply roller 53 and the tube 62 without being separated by the tube joint 79.

By adopting such a configuration, the release agent leakage preventing means of the fixing device according to the present invention can be made more effective.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, the folding step 70, the oil dripping prevention muffler 71, and the oil leakage prevention flange 72a which are the release agent leakage prevention means according to the embodiment of the present invention.
Are not limited to using each alone, and further effects can be obtained by appropriately combining them.

[0060]

As described above, according to the present invention, the provision of the release agent leakage preventing means prevents excess oil from entering into a mechanism other than a predetermined part or leaking to an unintended part. To prevent In addition, even if the nozzle is tilted, it is possible to provide a fixing device capable of preventing oil leakage to the outside of the fixing device and preventing oil from sneaking into an unintended mechanism.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a fixing device according to an embodiment of the present invention.

FIG. 2 is a schematic view for explaining a release agent leakage preventing means and an oil flow path according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining the effect of the release agent leakage preventing means according to the embodiment of the present invention.

FIG. 4 is a schematic view for explaining another example of the release agent leakage preventing means according to the embodiment of the present invention shown in FIG. 2;

FIG. 5 is a schematic diagram for explaining an example of a release agent leakage preventing unit according to an embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating a release agent leakage preventing unit and an oil flow path according to another embodiment of the present invention.

FIG. 7 is a view for explaining the rotation operation of the release agent leakage preventing means of FIG. 6;

FIG. 8 is a view illustrating a release agent leakage preventing unit according to another embodiment of the present invention.

FIG. 9 is a diagram for explaining a combined application example of the release agent leakage preventing means according to the embodiment of the present invention.

FIGS. 10A to 10D are views for explaining a combined application example of the release agent leakage preventing means according to the embodiment of the present invention.

FIG. 11 is a view for explaining a release agent leakage preventing means according to another embodiment of the present invention.

12 (a) to 12 (c) are schematic views of a bearing in a case where an oil supply roller is made detachable by a release agent leakage preventing unit according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... sheet, 11 ... toner, 20 ... fixing roller, 21 ... halogen lamp, 23 ... release layer, 30 ... pressure roller, 31 ... halogen lamp, 40 ... oil application mechanism, 41 ... application means, 43 ... supply nozzle 44, oil, 50, oil application roller, 53, oil supply roller, 54, through hole, 57, oil regulating blade, 65, pipe, 68, discharge hole, 70, bending step, 71, oil leakage prevention muffler, 72a ... oil leakage prevention flange, 72b ... oil leakage prevention flange, 73 ... plate, 74 ... plate, 75 ... rotating shaft, 76 ... variable part, 77 ... body frame, 78 ... fixing screw, 79 ... tube joint, 80 ... oil dripping Prevention sleeve, 81: rotating shaft, 82: bearing, 83: support member, 100: fixing device.

Claims (3)

[Claims] A rotating member for fixing a toner image held on a sheet by heat and pressure; an applying means extending along an axial direction of the rotating member and applying a release agent to the rotating member; A supply nozzle extending along the longitudinal direction of the application unit and supplying the release agent to the application unit from a plurality of discharge holes, and the release agent discharged from each of the discharge holes of the supply nozzle is A fixing device comprising: a release agent leakage preventing means for preventing leakage flowing down the surface of the supply nozzle. 2. A rotating body for fixing a toner image held on a sheet by heat and pressure, and a holding member extending along an axial direction of the rotating body and holding a release agent on an outer periphery of a core member. An application unit, a supply nozzle arranged inside the core member of the application unit and supplying the release agent to the application unit, and the release agent discharged from the supply nozzle is provided on an inner surface of the core member. And a release agent leakage preventing means for preventing leakage that flows down through the toner. 3. A rotating member for fixing a toner image held on a sheet by heat and pressure, and a rotating member extending along an axial direction of the rotating member and holding a release agent, the rotating member being attached to the rotating member. An application unit that applies the release agent, a supply nozzle that supplies the release agent to the application unit, and the release agent that is discharged from each of the discharge holes of the supply nozzle applies an outer surface of the application unit. A releasing agent leakage preventing means for preventing the leakage of the releasing agent from the end along the longitudinal direction of the holding member.