JP4862650B2 - Fixing apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a fixing device used for, for example, a copying machine, a laser printer, a facsimile, and the like, and an image forming apparatus using the fixing device.

  Conventionally, as a fixing device mounted on an electrophotographic color printer or a color copying machine, a heating roller having elasticity and releasability on the surface is generally heated from the inside by a halogen heater or the like. .

  However, in this fixing device, it takes 1 minute to several minutes after the power is turned on to reach a temperature at which the heating roller can be fixed. In this case, in order to respond to the print request from the user in a short time, it is necessary to maintain the roller at a high temperature from the standby state. As a result, the power consumption in the fixing device is increased.

  Therefore, a fixing device with improved temperature rise characteristics is provided as a configuration that reduces power consumption by shortening the time from when the power is turned on to when fixing is possible and at the same time lowering the standby temperature of the fixing device. (See Japanese Patent Application Laid-Open No. 2004-109878: Patent Document 1).

  In this fixing device, in order to shorten the time until fixing is possible, the amount of heat input to the heating roller is changed to the pressure roller so as not to be taken away by the pressure roller in pressure contact with the heating roller. A pressure belt having a smaller heat capacity than the pressure roller is used. Further, in order to prevent the heat from flowing out to the member in contact with the pressure belt, the pressure belt is not wound around the two rollers, but the pressure belt is pressed against the heating roller by the pressure pad. .

  With the above configuration, the amount of heat flowing out to the pressure belt side during the temperature rise of the heating roller is kept to a minimum, thereby shortening the time from when the power is turned on to when fixing is possible, and at the same time, The standby temperature can be lowered to reduce power consumption.

  However, since the pressure belt is slid and held on the pressure pad, it is important that the sliding resistance is sufficiently small in order to smoothly rotate the pressure belt. In general, a small sliding resistance is achieved by placing a sliding sheet between the pressure belt and the pressure pad and interposing a lubricant between the sliding sheet and the pressure belt. ing.

  In a state where the lubricant present on the boundary surface between the pressure belt and the sliding sheet is small, the sliding resistance is larger than the frictional force for the heating roller to drive the pressure belt, so that slip occurs, The pressure belt cannot rotate stably.

  In the fixing nip formed by the contact surface between the heating roller and the pressure belt and receiving a load by the pressure pad, the lubricant is pushed out of the fixing nip region, but the lubricant pushed out downstream of the fixing nip. The agent rotates while attached to the pressure belt, and is supplied again to the fixing nip. However, the extruded lubricant is lost as it is at both ends in the axial direction perpendicular to the sliding direction. In order to supplement the lost lubricant, the lubricant replenishing portion is in contact with the inner surface of the pressure belt, but the life of the fixing device is determined by the amount of lubricant held by the lubricant replenishing portion.

  In order to prevent the lubricant from being consumed from the end portion of the fixing nip region, a leakage prevention mechanism is provided at the end portion of the sliding sheet by liquid repellent processing or moisture-proof processing.

  However, a fluorine-based material such as PTFE suitable as a sliding sheet material has low wettability with respect to a lubricant such as silicone oil, and therefore it is difficult to perform liquid repellent processing with lower wettability. The sufficient effect of preventing the lubricant from leaking from the end portion cannot be expected. In addition, since the lubricant is consumed in the moisture-proof portion in the moisture-proofing process, it is not suitable for the purpose of preventing the lubricant from being consumed.

  Therefore, in order to prevent the leakage of the lubricant from the end portion in the axial direction, in other fixing devices, the relationship between the belt width, the sliding sheet width, and the width of the lubricant replenishing portion is expressed as follows. The width of the agent replenishment portion is made smaller in order (see JP 2005-148618 A: Patent Document 2).

  By making the sliding sheet width larger than the width of the lubricant replenishment part, the supply of lubricant to the sliding sheet end is reduced, and by making the belt width larger than the sliding sheet width, both ends of the belt In this case, no pressure is applied to the lubricant, and the lubricant cannot move, so that consumption of the lubricant from the belt end can be prevented. However, in the vicinity of the belt end, since the lubricant is not supplied to the central portion, the slidability of the belt is deteriorated with respect to the central portion at both ends, and in extreme cases, the belt may be wrinkled. Also become.

  In addition, regarding the leakage of lubricant from the fixing nip in the sliding direction, when there is no leakage prevention mechanism in the sliding direction, the lubricant is almost pushed out when the fixing device is stopped for a long time. For this reason, there is a problem that at the time of start-up, sliding occurs without a lubricant. As a result, it is not only necessary to select a motor with a large output just for start-up, but also the inner surface of the belt and the sliding sheet rub against each other directly, resulting in a decrease in life due to wear of the sliding sheet. .

Therefore, in another fixing device, unevenness is provided on the surface of the sliding sheet, and the convex shape is arranged in a lattice shape, so that the retention capability of the lubricant is improved, and even when the fixing device is stopped, It was possible to keep the lubricant in the region (see JP 2005-3969 A: Patent Document 3). However, if the movement of the lubricant in the belt axis direction orthogonal to the sliding direction is excessively limited, unevenness in the amount of lubricant retained tends to occur in the axial direction.
JP 2004-109878 A JP 2005-148618 A JP-A-2005-3969

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to retain the amount of lubricant in the belt axis direction on the sliding sheet while ensuring the capability of retaining the lubricant in the sliding direction and the belt axis direction on the sliding sheet. It is an object of the present invention to provide a fixing device that suppresses unevenness of the belt and prevents slipping of the belt and wrinkles of paper to be fixed over a long period of time.

In order to solve the above problems, the fixing device of the present invention is:
A pair of rotating bodies that rotate together in contact with each other;
A pressing portion that is arranged inside one of the pair of rotating bodies and presses the inner surface of the one rotating body toward the other rotating body of the pair of rotating bodies;
A sliding sheet that is disposed between the one rotating body and the pressing portion, and the inner surface of the rotating one rotating body slides through a lubricant;
On one surface of the sliding sheet on which the inner surface of the one rotating body slides, a lateral convex portion arranged side by side in the sliding direction of the one rotating body is orthogonal to the sliding direction. Longitudinal projections arranged in a row in the orthogonal direction are provided in a lattice shape,
The length in the orthogonal direction between the adjacent vertical convex portions is longer than the length in the sliding direction between the adjacent horizontal convex portions.

  According to the fixing device of the present invention, the one surface of the sliding sheet is provided with the horizontal convex portions arranged in the sliding direction and the vertical convex portions arranged in the orthogonal direction in a lattice shape. Therefore, the horizontal convex portion and the vertical convex portion prevent the lubricant on the one surface of the sliding sheet from leaking from the sliding direction and the orthogonal direction. The slip of the rotating body can be avoided, and an increase in driving torque for driving the one rotating body after stopping for a long time can be suppressed.

  Moreover, since the length in the orthogonal direction between the adjacent vertical convex portions is longer than the length in the sliding direction between the adjacent horizontal convex portions, on the one surface of the sliding sheet, The lubricant becomes easy to move in the orthogonal direction, that is, the axial direction of the one rotating body, and unevenness in the amount of lubricant retained on the one surface of the sliding sheet in the axial direction of the one rotating body is reduced. It is possible to suppress the occurrence of wrinkles of the recording material that is sandwiched and conveyed by the pair of rotating bodies.

  Therefore, while ensuring the holding ability of the lubricant in the sliding direction and the orthogonal direction in the sliding sheet, suppressing unevenness in the amount of the lubricant in the orthogonal direction in the sliding sheet, the above It is possible to realize a fixing device in which slip of one rotating body and wrinkles of the recording material do not occur over a long period of time.

  In the fixing device according to the embodiment, the horizontal convex portion extends along the orthogonal direction, and the vertical convex portion extends along the sliding direction.

  According to the fixing device of this embodiment, the horizontal convex portion extends along the orthogonal direction, and the vertical convex portion extends along the sliding direction. The length in the orthogonal direction between the convex portions can be more reliably made longer than the length in the sliding direction between the adjacent lateral convex portions, and the sliding direction and the above in the sliding sheet While further securing the holding ability of the lubricant in the orthogonal direction, it is possible to further suppress unevenness in the amount of the lubricant held in the orthogonal direction on the sliding sheet.

  In one embodiment, the sliding sheet includes a glass cloth or metal wire mesh base material and a resin impregnated in the base material.

  According to the fixing device of this embodiment, since the sliding sheet has a glass cloth or metal wire mesh base material and a resin impregnated in the base material, the distance between the warp and the weft of the base material is changed. Thus, the ratio of the interval between the vertical convex portions and the interval between the horizontal convex portions can be easily changed.

  In one embodiment, the sliding sheet is attached to the pressing portion.

  According to the fixing device of this embodiment, since the sliding sheet is attached to the pressing portion, it is easy to attach the sliding sheet.

  In one embodiment, the length in the sliding direction between the adjacent lateral protrusions is 0.1 mm to 1.0 mm.

  According to the fixing device of this embodiment, the length in the sliding direction between the adjacent lateral convex portions is 0.1 mm to 1.0 mm, and therefore, on the one surface of the sliding sheet, The lubricant can be sufficiently retained in the sliding direction.

  In the fixing device according to the embodiment, the horizontal convex portions and the vertical convex portions have a height of 100 μm to 800 μm.

  According to the fixing device of this embodiment, since the height of the horizontal convex portion and the vertical convex portion is 100 μm to 800 μm, image defects are prevented while sufficiently retaining the lubricant.

  In the fixing device according to the embodiment, the length in the orthogonal direction between the adjacent vertical convex portions is different in the position in the orthogonal direction of the sliding sheet.

  According to the fixing device of this embodiment, since the length in the orthogonal direction between the adjacent vertical convex portions is different at the position in the orthogonal direction of the sliding sheet, the orthogonality on the sliding sheet is The lubricant can be optimized in the direction.

  In the fixing device according to an embodiment, the length in the orthogonal direction between the adjacent vertical convex portions is continuously different at the position in the orthogonal direction of the sliding sheet.

  According to the fixing device of this embodiment, the length in the orthogonal direction between the adjacent vertical convex portions is continuously different at the position in the orthogonal direction of the sliding sheet. In the above orthogonal direction, the lubricant can be brought into an optimum state.

  An image forming apparatus according to the present invention includes the fixing device.

  According to the image forming apparatus of the present invention, since the fixing device is provided, an image forming apparatus capable of obtaining a high-quality image stably for a long period of time can be realized.

  According to the fixing device of the present invention, the length in the orthogonal direction between the adjacent vertical convex portions is longer than the length in the sliding direction between the adjacent horizontal convex portions. While ensuring the retention capability of the lubricant in the sliding direction and the orthogonal direction on the sheet, while suppressing unevenness in the amount of lubricant retained in the orthogonal direction on the sliding sheet, A fixing device in which slip and wrinkles of the recording material do not occur over a long period of time can be realized.

  Further, according to the image forming apparatus of the present invention, since the fixing device is provided, an image forming apparatus capable of obtaining a high-quality image stably for a long period of time can be realized.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a simplified configuration diagram showing an embodiment of a fixing device according to the present invention. This fixing device is disposed inside the pressure belt 2 (as one rotating body) and the fixing roller 1 and the pressure belt 2 (as a pair of rotating bodies) rotating together with the outer peripheral surfaces in contact with each other. The pressure belt 2 is disposed between the pressure belt 2 and the pressure portion 3 and the pressure portion 3 that presses the inner surface of the pressure belt 2 toward the fixing roller 1 (as the other rotating body). The inner surface of the rotating pressure belt 2 has a sliding sheet 4 that slides through a lubricant.

  The fixing roller 1 is rotated by a driving unit such as a motor (not shown), and the pressure belt 2 is rotated by the rotation of the fixing roller 1 by friction with the fixing roller 1. The fixing roller 1 is heated by a heater 11 disposed therein, and the pressure belt 2 receives heat from the fixing roller 1.

  The fixing roller 1 and the pressure belt 2 are in contact with each other and fix the toner t of the recording material P while conveying the recording material P. Specifically, a fixing nip is formed by contact between the fixing roller 1 and the pressure belt 2, and the recording material P is melted and fixed by the fixing nip. Transport. The toner t is satisfactorily fixed on the recording material P by pressing due to the elastic deformation of the pressing portion 3.

  The recording material P is, for example, a sheet such as paper or an OHP sheet. A toner t is attached to one surface of the recording material P, and the toner t is made of a material having heat melting properties such as a resin, a magnetic material, or a colorant.

  The fixing roller 1 is in contact with one surface (image surface) of the recording material P. The fixing roller 1 is a hollow roller, and has a core layer, an elastic layer, and a surface layer in order from the inside to the outside. The outer diameter of the fixing roller 1 is, for example, 26 mm. The core layer is made of aluminum having a thickness of 2 mm, for example. The elastic layer is made of, for example, silicon rubber having a thickness of 200 μm. The surface layer is made of a PFA tube having a thickness of 20 μm, for example.

  The pressure belt 2 is an endless belt, and the outer diameter of the pressure belt 2 is, for example, 30 mm and is made of polyimide having a thickness of 70 μm.

  A support portion (not shown) is provided inside the pressure belt 2, and the pressing portion 3 is fixed to the support portion via a compression spring 7.

  The pressing portion 3 includes a base 31 attached to the compression spring 7 and a pad 32 attached to the base 31. The pad 32 is made of, for example, silicon rubber.

  The sliding sheet 4 is attached to the pressing portion 3. The sliding sheet 4 is fixed to the base 31 and covers the pad 32. The sliding sheet 4 is fixed to the base 31 at one end upstream of the pressing portion 3 in the rotation direction of the pressure belt 2, and downstream of the pressing portion 3 in the rotation direction of the pressure belt 2. The other end of the side is a free end. In addition, you may attach the said sliding sheet 4 so that it may wind around the said press part 3. FIG.

  That is, the sliding sheet 4 contacts the inner surface of the pressure belt 2, and the pressure belt 2 slides on the sliding sheet 4.

  A guide plate 5 is disposed on the inner surface of the pressure belt 2, and the guide plate 5 supports the pressure belt 2 at both ends in the axial direction of the pressure belt 2.

  A lubricant supply unit 6 is disposed on the inner surface of the pressure belt 2, and the lubricant supply unit 6 applies the lubricant to the inner surface of the pressure belt 2, and Lubricity with the sliding sheet 4 is ensured. The lubricant supply unit 6 is, for example, an oil application felt.

  The lubricant is, for example, silicon oil. When silicon oil is used as the lubricant, the oil viscosity is adjusted according to the fixing nip temperature and the conveyance speed of the recording material P. When the fixing nip temperature is high and the conveyance speed is high, The viscosity of this oil is adjusted to be high. For example, when the temperature of the fixing nip is 160 to 200 ° C. and the conveyance speed of the recording material P is 50 to 200 mm / s, the viscosity of the oil is 20 to 1000 cs.

  As shown in FIG. 2, on one surface of the sliding sheet 4 on which the inner surface of the pressure belt 2 slides, a lateral protrusion 41 arranged side by side in the sliding direction of the pressure belt 2 is arranged. And the vertical convex part 42 arranged in the orthogonal direction orthogonal to the said sliding direction at intervals is provided in the grid | lattice form. Here, the orthogonal direction is, in other words, the axial direction of the pressure belt 2 or the longitudinal direction of the sliding sheet 4.

  The lateral convex portion 41 extends along the orthogonal direction, and the longitudinal convex portion 42 extends along the sliding direction.

  The length in the orthogonal direction between the adjacent vertical convex portions 42 is longer than the length in the sliding direction between the adjacent horizontal convex portions 41.

  That is, the lattice formed by the horizontal convex portions 41 and the vertical convex portions 42 has a rectangular shape in which a side along the sliding direction is a short side and a side along the orthogonal direction is a long side. The horizontal convex portions 41 and the vertical convex portions 42 have a height of 100 μm to 800 μm.

  As shown in the schematic diagram of FIG. 3, the sliding sheet 4 has a concave portion 45 formed by being surrounded by the lateral convex portion 41 and the vertical convex portion 42, and the lubricant is provided in the concave portion 45. Is retained.

  The sliding sheet 4 has a glass cloth or metal wire mesh base material and a resin impregnated in the base material. That is, the fibrous base material is impregnated with a fluorine-based resin such as PTFE and fired to produce the sliding sheet 4 having irregularities. In addition, you may make it form an unevenness | corrugation in the one surface of the said sliding sheet 4 by pressing uneven | corrugated shape with a type | mold like embossing.

  FIG. 4 shows the relationship between the length in the sliding direction between the adjacent lateral convex portions 41 and the starting torque. Here, the horizontal axis indicates the pitch of the horizontal protrusions 41, and the vertical axis indicates the starting torque for starting the pressure belt 2 after stopping for a certain time.

  As can be seen from FIG. 4, when the length in the sliding direction between the adjacent lateral convex portions 41 is 0.1 mm to 1.0 mm (more preferably, 0.1 mm to 0.5 mm), The starting torque can be reduced.

  That is, when the length in the sliding direction between the adjacent lateral convex portions 41 is 0.1 mm to 1.0 mm, lubrication is performed in the sliding direction on the one surface of the sliding sheet 4. The agent can be retained sufficiently.

  On the other hand, when the length in the sliding direction between the adjacent lateral protrusions 41 is larger than 1.0 mm, the width of the fixing nip in the swing direction is generally about 3 mm to 10 mm. Therefore, there are only a few lateral protrusions 41 in the fixing nip region, and the lubricant cannot be sufficiently retained. On the other hand, if the length in the sliding direction between the adjacent lateral protrusions 41 is smaller than 0.1 mm, the space formed between the adjacent lateral protrusions 41 becomes small, and the lubricant Can not be retained sufficiently.

  FIG. 5 shows the relationship between the length in the orthogonal direction between the adjacent vertical convex portions 42 and the retention rate of the lubricant. Here, the horizontal axis indicates the pitch of the vertical protrusions 42, and the vertical axis indicates the oil retention rate.

  As can be seen from FIG. 5, the oil retention is high even if the length in the orthogonal direction between the adjacent vertical convex portions 42 exceeds 1 mm. This is because the width of the fixing nip in the longitudinal direction is sufficiently larger than the width of the fixing nip in the sliding direction. In order to uniformly diffuse the amount of oil in the fixing nip, it is advantageous that the grid interval is wide. Therefore, the grid interval is preferably longer in the longitudinal direction than in the sliding direction.

  According to the fixing device having the above-described configuration, the one side of the sliding sheet 4 includes the horizontal convex portions 41 arranged in the sliding direction and the vertical convex portions 42 arranged in the orthogonal direction. Therefore, the lateral protrusion 41 and the vertical protrusion 42 prevent the lubricant on the one surface of the sliding sheet 4 from leaking from the sliding direction and the orthogonal direction. Thus, slip of the pressure belt 2 can be avoided, and an increase in driving torque for driving the pressure belt 2 after stopping for a long time can be suppressed.

  Moreover, since the length in the orthogonal direction between the adjacent vertical convex portions 42 is longer than the length in the sliding direction between the adjacent horizontal convex portions 41, the one surface of the sliding sheet 4. The lubricant can easily move in the orthogonal direction, that is, the axial direction of the pressure belt 2, and the amount of lubricant retained on the one surface of the sliding sheet 4 in the axial direction of the pressure belt 2. And the occurrence of wrinkling of the recording material P that is nipped and conveyed by the fixing roller 1 and the pressure belt 2 can be prevented.

  Therefore, while ensuring the holding ability of the lubricant in the sliding direction and the orthogonal direction on the sliding sheet 4, unevenness in the amount of the lubricant held in the orthogonal direction on the sliding sheet 4 is suppressed. A fixing device with a short warm-up time in which slip of the pressure belt 2 and wrinkles of the recording material P do not occur over a long period of time can be realized.

  Moreover, since the said horizontal convex part 41 is extended along the said orthogonal direction, and the said vertical convex part 42 is extended along the said sliding direction, it is between the said adjacent vertical convex parts 42. The length in the orthogonal direction can be made longer than the length in the sliding direction between the adjacent lateral protrusions 41 in the sliding direction in the sliding sheet 4 and in the orthogonal direction. It is possible to further suppress unevenness in the amount of lubricant retained in the orthogonal direction on the sliding sheet 4 while further securing the retention capability of the lubricant.

  The sliding sheet 4 has a glass cloth or metal wire mesh base material and a resin impregnated in the base material. Therefore, by changing the distance between the warp and the weft of the base material, The ratio between the interval 42 and the interval between the lateral protrusions 41 can be easily changed.

  Moreover, since the said sliding sheet 4 is attached to the said press part 3, attachment of the said sliding sheet 4 becomes easy.

  Moreover, since the height of the said horizontal convex part 41 and the said vertical convex part 42 is 100 micrometers-800 micrometers, generation | occurrence | production of an image defect is prevented, hold | maintaining lubricant sufficiently. On the other hand, if the heights of the horizontal convex portions 41 and the vertical convex portions 42 are larger than 800 μm, the unevenness becomes excessive and image defects increase. On the other hand, if the height of the horizontal convex portion 41 and the vertical convex portion 42 is smaller than 100 μm, the lubricant cannot be sufficiently retained.

  The length in the orthogonal direction between the adjacent vertical convex portions 42 may be different at the position in the orthogonal direction of the sliding sheet 4, and the orthogonal direction on the sliding sheet 4. The lubricant can be brought into an optimal state. For example, in order to prevent the lubricant from leaking from both longitudinal ends of the sliding sheet 4, the vertical convex portions 42 are provided only at the longitudinal end portions of the swing sheet 4, or the sliding sheet You may make the pitch of the said vertical convex part 42 of the longitudinal direction edge part of 4 narrow.

  Further, the length in the orthogonal direction between the adjacent vertical convex portions 42 may be continuously different at the position in the orthogonal direction of the sliding sheet 4. The lubricant can be brought into an optimum state in the orthogonal direction. For example, by narrowing the pitch of the vertical protrusions 42 toward the longitudinal end of the sliding sheet 4, the longitudinal end of the sliding sheet 4 ensures a sufficient oil retaining function, The central portion in the longitudinal direction of the sliding sheet 4 can sufficiently satisfy the oil amount unevenness mitigating function.

  Further, the lateral convex portion 41 may be inclined and extended in the orthogonal direction, and the vertical convex portion 42 may be inclined and extended in the sliding direction. The length in the orthogonal direction between 42 may be longer than the length in the sliding direction between the adjacent lateral protrusions 41.

(Second Embodiment)
FIG. 6 shows a simplified configuration diagram as an embodiment of the image forming apparatus of the present invention. The image forming apparatus includes an image forming apparatus 80 that forms an image by attaching unfixed toner t to the recording material P, and the first embodiment in which the toner t is melted and fixed to the recording material P. The fixing device 81 is provided.

  The image forming device 80 includes a photoconductor 60 that forms a toner image, an intermediate transfer belt 63 to which a toner image formed by the photoconductor 60 is transferred, and an image that is transferred to the intermediate transfer belt 63. And a secondary transfer roller 64 for transferring to the material P.

  The photosensitive member 60 is uniformly charged by a charging unit (not shown), and the charged photosensitive member 60 is formed with an electrostatic latent image by an exposure unit 61 for performing image exposure. The image is developed by the developing unit 62 having toner. The developing unit 62 has four color toners of yellow (Y), magenta (M), cyan (C), and black (K).

  Next, the operation of this image forming apparatus will be described.

  A constant surface potential is formed on the photoreceptor 60 by a charging unit (not shown). When the surface of the photoconductor 60 is irradiated with laser light in accordance with the image pattern to be printed by the exposure unit 61, the surface potential of the irradiated portion is attenuated, and the surface of the photoconductor 60 is electrostatically charged. An image is formed.

  In the developing unit 62, the toner is in a pre-charged state, and the electrostatic attraction between the toner and the surface of the photoconductor 60 responds to the electrostatic image on the photoconductor 60. Toner adheres.

  The toner adhering to the surface of the photoconductor 60 is transferred onto the intermediate transfer belt 63 by an electric field formed between the photoconductor 60 and the intermediate transfer belt 63.

  By repeating the above process for four colors, an image in which four color toners are superimposed is formed on the intermediate transfer belt 63.

  The toner image formed on the intermediate transfer belt 63 is transferred to the recording material P by the secondary transfer roller 64 using an electric field and pressure. Finally, the toner image is heated by the fixing device 81. And the pressure on the recording material P.

  According to the image forming apparatus having the above configuration, since the fixing device 81 is provided, it is possible to realize an image forming apparatus capable of obtaining a high-quality image stably for a long period of time.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, a fixing belt may be used instead of the fixing roller 1. The image forming apparatus may be any one of a monochrome / color copying machine, a printer, a FAX, and a complex machine of these.

1 is a longitudinal sectional view showing an embodiment of a fixing device of the present invention. 2 is a simplified perspective view of a fixing device. FIG. It is a schematic diagram of the surface of a sliding sheet. It is a graph which shows the relationship between the convex part space | interval of the sliding direction of a sliding sheet, and starting torque. It is a graph which shows the relationship between the convex part space | interval of the longitudinal direction of a sliding sheet, and an oil retention. 1 is a simplified configuration diagram showing an image forming apparatus of the present invention.

Explanation of symbols

1 Fixing roller (the other rotating body)
11 Heater 2 Pressure belt (One rotating body)
DESCRIPTION OF SYMBOLS 3 Press part 31 Base 32 Pad 4 Sliding sheet 41 Horizontal convex part 42 Vertical convex part 45 Concave part 5 Guide plate 6 Lubricant supply part 7 Compression spring 60 Photoconductor 61 Exposure part 62 Developing part 63 Intermediate transfer belt 64 Secondary transfer Roller 80 Image forming device 81 Fixing device P Recording material t Toner

Claims (9)

A pair of rotating bodies that rotate together in contact with each other;
A pressing portion that is arranged inside one of the pair of rotating bodies and presses the inner surface of the one rotating body toward the other rotating body of the pair of rotating bodies;
A sliding sheet that is disposed between the one rotating body and the pressing portion, and the inner surface of the rotating one rotating body slides through a lubricant;
On one surface of the sliding sheet on which the inner surface of the one rotating body slides, a lateral convex portion arranged side by side in the sliding direction of the one rotating body is orthogonal to the sliding direction. Longitudinal projections arranged in a row in the orthogonal direction are provided in a lattice shape,
The fixing device according to claim 1, wherein a length in the orthogonal direction between the adjacent vertical convex portions is longer than a length in the sliding direction between the adjacent horizontal convex portions. The fixing device according to claim 1,
The fixing device according to claim 1, wherein the lateral convex portion extends along the orthogonal direction, and the vertical convex portion extends along the sliding direction. The fixing device according to claim 1,
The above-mentioned sliding sheet has a glass cloth or metal wire mesh base material, and a resin impregnated in this base material. The fixing device according to claim 1,
The fixing device, wherein the sliding sheet is attached to the pressing portion. The fixing device according to claim 1,
The fixing device according to claim 1, wherein a length in the sliding direction between the adjacent lateral convex portions is 0.1 mm to 1.0 mm. The fixing device according to claim 1,
The fixing device according to claim 1, wherein the horizontal convex portions and the vertical convex portions have a height of 100 μm to 800 μm. The fixing device according to claim 1,
The fixing device according to claim 1, wherein a length in the orthogonal direction between the adjacent vertical convex portions is different at a position in the orthogonal direction of the sliding sheet. The fixing device according to claim 1,
The fixing device according to claim 1, wherein a length in the orthogonal direction between the adjacent vertical convex portions is continuously different at a position in the orthogonal direction of the sliding sheet.   An image forming apparatus comprising the fixing device according to claim 1.

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