JPH11344904A - Lubricant supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly supply a lubricant to an image carrier by providing the divided solid lubricant and a rotating body brought in contact with the solid lubricant and the image carrier and supplying the lubricant to the image carrier. SOLUTION: A solid lubricant 75 is arranged on a brush roller 77 and divided into two. By dividing the lubricant 75 into two, since the lubricant is made smaller than the single solid lubricant, it is hardly cracked. The respective lubricant 75 is pressed to the nap 81 of the roller 77 by gravity. The roller 77 is also formed by implanting the nap 81 on the peripheral surface of a rotating roller 87. Then when a cleaning unit is positioned at a specified position, the roller 77 press-contacts with the surface of an intermediate transfer body and is rotated by frictional force with the intermediate transfer body. By such rotation, the lubricant adhering to the nap 81 of the roller 77 is supplied to the surface of the intermediate transfer body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricant supply device for supplying a lubricant to the surface of an image carrier of an electrophotographic apparatus such as a copying machine, a laser printer, and a laser facsimile.

[0002]

2. Description of the Related Art Generally, a lubricant is supplied to an image carrier in an electrophotographic apparatus such as a copying machine or a laser printer. This reduces the frictional force between the image carrier and the cleaning blade by supplying a lubricant,
This is to improve the cleaning performance by reducing the wear of the image carrier surface and the cleaning blade caused by the friction between the two.

Further, by supplying a lubricant to reduce the frictional force of the image carrier, the amount of toner adhered to the non-image portion of the image carrier can be reduced. That is, when the toner comes into contact with the image carrier in the developing area, a physical attraction force acts between the two, and the electrostatic toner in the developing area alone cannot completely separate the adhered toner from the image carrier. Therefore, by supplying a lubricant to the surface of the image carrier, the adhesive force acting between the toner and the image carrier is reduced, thereby preventing the toner from adhering to the non-image portion.

[0004] Further, by supplying a lubricant to reduce the adhesive force, the toner is easily transferred to the transfer paper, thereby preventing worm-like transfer whiteout and preventing the toner from transferring to the transfer paper. Since the transfer electric field can be reduced, it is possible to prevent toner from re-adhering to the image carrier due to peeling discharge when the transfer paper is separated from the image carrier.

As a lubricant supply device for supplying the above-described lubricant, as disclosed in Japanese Patent Application Laid-Open No. 8-78033, a lubricant integrally formed by sticking solid pieces together with a spring or the like is used. There is known a technique in which a lubricant is pressed against a rotating body, a lubricant is adhered to the surface of the rotating brush via the rotating body, and the lubricant on the rotating body is supplied to the image carrier by rotation of the rotating brush.

[0006]

However, in the above-described technique, the lubricant is pressed against the rotating body by a spring or the like, and the lubricant may be bent by the pressing force. The bent portion is less likely to be pressed against the rotating body. In addition, since the lubricant has a solid piece attached to it, the length of the lubricant increases, and when the lubricant vibrates due to the rotation of the rotating body, the vibration width increases. The attached lubricant will vary. Due to these factors, there is a problem that the supply of the lubricant to the image carrier becomes uneven.

Accordingly, an object of the present invention is to provide a lubricant supply device capable of uniformly supplying a lubricant to an image carrier.

[0008]

According to a first aspect of the present invention, there is provided a solid lubricant divided into a plurality of portions, the solid lubricant being in contact with the solid lubricant and the image carrier, and the solid lubricant being lubricated to the image carrier by rotation. And a rotating body for supplying the agent.

According to the first aspect of the present invention, the solid lubricant is attached to the surface of the rotating body by rotating the rotating body, and the lubricant attached to the surface of the rotating body is supplied to the image carrier. Since the solid lubricant is divided into a plurality of parts, the length of the solid lubricant can be shortened, and the deflection of the solid lubricant as in the related art hardly occurs. Further, even when the solid lubricant vibrates due to the rotation of the rotating body, the vibration width can be short, so that the dispersion of the lubricant adhering to the rotating body surface is reduced. Since the deflection of the solid lubricant is less likely to occur and the dispersion of the lubricant attached to the surface of the rotating body is reduced,
The lubricant can be uniformly supplied to the image carrier.

According to a second aspect of the present invention, in the first aspect of the invention, the solid lubricant is disposed on the rotating body, and the solid lubricant presses the rotating body by its own weight. It is characterized by the following.

According to the second aspect of the present invention, the solid lubricant is pressed against the rotating body by its own weight, and is not pressed by a spring or the like as in the prior art. The bending and chipping of the agent itself are less likely to occur,
The lubricant can be supplied stably.

[0012] The invention according to claim 3 is the invention according to claim 1 or 2.
In the invention described in (1), the solid lubricant is provided with a weight member that gives weight to each solid lubricant.

According to the third aspect of the present invention, the pressing force of the solid lubricant on the rotating body can be adjusted by providing the weight member and adjusting the weight of the weight member. Since the supply amount of the lubricant supplied to the image carrier is proportional to the pressing force of the solid lubricant on the rotating body, the supply amount of the lubricant can be adjusted with a simple configuration in which only the weight member is provided.

According to a fourth aspect of the present invention, in the third aspect of the present invention, when the solid lubricant is moved to one end side of the rotator at and above one end of the rotator. And an elastic member pressed by the weight member is provided.

According to the present invention, when the solid lubricant approaches one end of the rotating body, the weight member of the solid lubricant presses against the elastic member, and the elastic member presses the impact when the weight member presses. To relax. Since the elastic member reduces the impact at the time of pressing, breakage of the solid lubricant is prevented.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the weight member includes a projecting portion projecting from an end surface of the solid lubricant toward the elastic member. I do.

According to the fifth aspect of the invention, when the solid lubricant approaches one end of the rotating body, the projecting portion of the weight member presses the elastic member. What is pressed against the elastic member is a protruding portion formed on the weight member, and the solid lubricant is not pressed against the elastic member, so that the breakage of the solid lubricant is further prevented.

The invention according to claim 6 is characterized in that a solid lubricant,
A rotating body that comes into contact with the solid lubricant and the image carrier, and supplies the lubricant to the image carrier by rotation, wherein the solid lubricant is disposed above the rotating body, and the solid lubricant is disposed under its own weight. It is characterized in that it is pressed against a rotating body.

According to the present invention, not only when the solid lubricant is separated but also when the solid lubricant is provided alone, the solid lubricant is pressed against the rotating body by its own weight. The solid lubricant itself is unlikely to be bent or chipped, and the lubricant can be uniformly supplied to the image carrier.

The invention according to claim 7 is characterized in that, in the invention according to claim 6, the solid lubricant is provided with a weight member for giving weight to the solid lubricant.

According to the seventh aspect of the present invention, the pressing force of the solid lubricant on the rotating body can be adjusted by providing the weight member and adjusting the weight of the weight member. Since the supply amount of the lubricant supplied to the image carrier is proportional to the pressing force of the solid lubricant on the rotating body, the supply amount of the lubricant can be adjusted with a simple configuration in which only the weight member is provided.

The invention described in claim 8 is the first to seventh aspects of the present invention.
In the invention according to any one of the above, the rotating body,
The brush is a brush roller having raised brushes on its peripheral surface, wherein the raised brush extends obliquely with respect to the rotation axis.

According to the eighth aspect of the present invention, the solid lubricant is disposed on the brushes extending obliquely of the brush roller, and the brushes are pushed down by the weight of the solid lubricant. When the solid lubricant vibrates due to the rotation of the brush roller, the raised brush tends to return to the original position by the return force, so that the solid lubricant moves in the rotation axis direction.

When the solid lubricant is divided into a plurality of solid lubricants, the solid lubricants are moved in one direction during the rotation of the brush roller, and the solid lubricants adhere to each other. Can be easily filled, so that the lubricant can be supplied to the image bearing member without gaps, and the lubricant can be supplied more uniformly.

When the solid lubricant is used alone, the solid lubricant is moved in one direction during the rotation of the brush roller, and the position of the solid lubricant is stabilized. Since the variation in the attachment position can be reduced, the lubricant can be more uniformly supplied.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 schematically shows a color copying machine to which the present invention is applied. The color copying machine is a color electrostatic image forming apparatus including an intermediate transfer body 10 that is an image bearing member, and is a color image forming apparatus that separates and reads a document image and converts the read image into color image data that is an electrical signal. It has a scanner and a laser writing unit 5 as exposure means.

The writing unit 5 includes a laser light emitting means (laser diode) (not shown), a light emission drive control unit (not shown) for controlling light emission of the laser light emitting means, a polygon mirror 5B, and a motor for rotating the polygon mirror 5B. 5A
, An f / θ lens 5C, and a reflection mirror 5F.

With this configuration, the writing unit 5 converts the color image data from the color scanner into an optical signal, performs optical writing corresponding to the original image, and performs a belt-like photosensitive member as an image bearing member. 1 to form an electrostatic latent image on the surface. That is, the light from the laser emitting means is transmitted to the polygon mirror 5 rotated by the motor 5A.
B, and the f / θ lens 5C and the reflection mirror 5
After passing through F and the like, the photosensitive member 1 reaches the photosensitive member 1 and forms a latent image corresponding to the written information on the charged photosensitive member 1.

The photosensitive member 1 is rotatably supported by rotating rollers 2 and 3, and rotates clockwise as indicated by arrow A in the figure. Around the photoconductor 1, a photoconductor cleaning unit having a cleaning blade 15A and a waste toner collecting container 15, a static elimination lamp L, and a charger 4 are arranged. At a position downstream of the charger 4, there is provided an optical writing unit to which a laser beam 5 </ b> D emitted from the laser writing unit 5 is applied. At a position downstream of the light writing unit, a selected developing device (cyan developing device in the figure) of the rotary developing device 6 as a developing unit is used.
, A black developing unit 7 containing black toner, and the above-described intermediate transfer body 10 are arranged.

The rotary developing device 6 includes a developing device C for cyan.
And a magenta developing device M and a yellow developing device Y. The rotary developing device 6 is rotated by 120 degrees via a rotary drive unit (not shown), and the developing devices C,
One of M and Y is moved to the development position. Each of the developing units C, M, and Y includes a developing sleeve that rotates by bringing an ear of the developer into contact with the surface of the photoconductor 1 to visualize an electrostatic latent image on the photoconductor 1, and draws up the developer. And a developing paddle that rotates for stirring. Any one of the developing units C, M, and Y moves to a developable position in synchronization with the development timing of the corresponding color. In this case, when each of the developing units C, M, and Y operates, the black developing unit 7 is moved to a position separated from the photoconductor 1. This movement is controlled by the rotation of the cam 45.

The transfer material 17A to which the toner image is transferred is sent out from a paper feeding device (paper feeding cassette) 17 via a paper feeding roller 18 and a conveying roller pair 19, and is interposed at a predetermined timing by a registration roller pair 20. It is fed into a nip between the transfer body 10 and the transfer roller 14.

On the other hand, before the transfer material 17A is conveyed, toner images of a predetermined color are sequentially formed on the photoreceptor 1, and each time the toner image of each color is transferred to the same position of the intermediate transfer member 10 at the same position. (The color is transferred one by one every time the intermediate transfer body 10 makes one rotation). In this case, the photoconductor 1 is cleaned for each color to prepare for the formation of the next color.

The toner images of a plurality of colors sequentially superimposed on the intermediate transfer member 10 are collectively transferred to a transfer material 17A sent to a nip portion between the intermediate transfer member 10 and the transfer roller 14 by the action of the transfer roller 14. Is done. The transfer material 17A to which the toner images of a plurality of colors are collectively transferred is then transferred to the fixing device 5A.
The toner image is sent to the fixing roller 50A, and the toner image is fixed by the fixing roller 50A, and is discharged by the discharge roller pair 51 to the discharge stack 52 provided at the upper portion of the frame 8 of the apparatus main body. In order to facilitate the replacement of the rotary developing device 6, the black developing device 7, and the like, and the jam processing, the frame 8 is rotated about the support shaft 9A to open the inside of the device main body.

In the apparatus main body, the transmission
The control device E is housed. Above the transmission / control device E, a fan F for releasing heat to the outside is provided in order to prevent a rise in temperature of the electric appliance. In the main body of the apparatus, another relatively small paper feeder MF is provided on the right side in the figure. OP in the figure is an operation panel.

The intermediate transfer member 10 is rotatably supported by rotating rollers 11 and 12. A bias unit 13 is provided on the back surface of the intermediate transfer body 10, and the toner image on the photoconductor 1 is transferred to the front surface of the intermediate transfer body 10 by the bias unit 13. A cleaning unit 16 for cleaning the surface of the intermediate transfer member 10 is provided beside the rotating roller 11 of the intermediate transfer member 10.

As shown in FIG. 2, the cleaning unit 16 has a cleaning device 61 and a lubricant supply device 63. The cleaning device 61 and the lubricant supply device 63 are housed in one casing 65. Have been.
The casing 65 can be freely moved toward and away from the intermediate transfer body 10 via the release lever 73.

The cleaning device 61 includes a casing 65
And has a cleaning blade 67. A pressure spring 69 is arranged at the lower bottom of the casing 65, and the pressure of the pressure spring 69 causes the casing 65 to be positioned at a position indicated by a solid line in FIG. When the casing 65 is located at this position, the cleaning blade 65 deflects the residual toner on the intermediate transfer body 10 by a predetermined amount. Intermediate transfer member 10
When receiving the toner image from the photoreceptor 1, the release lever 73 is rotated about the rotation shaft 73a by a release means (not shown) such as a solenoid, and the casing 65 is moved against the pressure spring 69, as shown in FIG. Move to the position shown by the dotted line.

The lubricant supply device 63 is located above the casing 65 and has a solid lubricant 75 and a brush roller 77. In the present embodiment, the solid lubricant 75 is made of zinc stearate, and the zinc stearate is supplied to the intermediate transfer body 10 to reduce the friction coefficient of the surface of the intermediate transfer body 10 so that the solid lubricant 75 is transferred. The transfer performance of the toner image onto the transfer material 17A by the roller 14 is improved, and the abrasion of the cleaning blade 67 is reduced to improve the cleaning performance. Note that reference numeral 85 in FIG.
Denotes an entrance seal. The entrance seal 85 prevents the toner from scattering from the cleaning unit 16 and regulates the movement of the solid lubricant 75 in the left-right direction in the figure.

In addition to the above-mentioned zinc stearate, the solid lubricant 75 includes, for example, barium stearate, lead stearate, nickel stearate, cobalt stearate, iron stearate, copper stearate, strontium stearate, and calcium stearate. , Cadmium stearate, magnesium stearate, manganese oleate, iron oleate, cobalt oleate, lead oleate, magnesium oleate, copper oleate, zinc palmitate, cobalt palmitate, copper palmitate,
Relatively higher fatty acids such as magnesium palmitate, aluminum palmitate, calcium palmitate, lead cabrate, lead caproate, zinc linolenate, cobalt linolenate, and cadmium linolenate can be used. In addition, a colloidal high-temperature silica powder can be used, and a natural wax such as carnauba wax can also be used.

As shown in FIG. 3, the solid lubricant 75 is arranged on the brush roller 77 and is divided into two parts. By dividing the solid lubricant 75 into two parts, the solid lubricant 75 can be made smaller than a single solid lubricant, so that cracks are less likely to occur. Each solid lubricant 75 is applied to the brush roller 7 by its own weight.
7 is pressed against the raised portion 81. Each solid lubricant 75 is pressed against the brush roller 77 by its own weight,
Since the pressing force is smaller than the pressing force by a spring or the like as in the related art, the solid lubricant 75 itself is unlikely to be bent or chipped, and the lubricant can be supplied stably.

A sheet metal (weight member) 79 is integrally mounted on each solid lubricant 75, and the sheet metal 79 gives weight to the solid lubricant 75. Sheet metal 79 with solid lubricant 7
5, the pressing force against the raised brush 81 can be increased. The supply amount of the lubricant supplied to the intermediate transfer body 10 is proportional to the pressing force of the solid lubricant 75 on the raising 81. Therefore, by adjusting the weight of the sheet metal 79, the amount of the lubricant adhering to the raised brush 81 can be adjusted, and the supply of the lubricant to the intermediate transfer body 10 can be performed with a simple structure simply by attaching the sheet metal 79. You can adjust the amount.
Note that, for example, if the weight of the sheet metal 79 is biased such that one end of the sheet metal 79 is heavier than the other end, local adjustment can also be performed.

Sheet metal 7 attached to each solid lubricant 75
9, the right side metal plate 79 in FIG. 3 has a protruding portion 79a protruding at one end on the right side. An elastic member 83 for cushioning the impact is provided beside the projecting portion 79a. When the solid lubricant 75 approaches the elastic member 83, the projecting portion 79a presses the elastic member 83. Elastic member 83
The solid lubricant 75 does not hit the elastic member 83, so that the solid lubricant 75 is prevented from being damaged. Moreover, since the elastic member 83 reduces the impact at the time of pressing, the breakage of the solid lubricant 75 can be further prevented.

In the present embodiment, the brush roller 77 is a brush roller 77 having a diameter of 12 mm, and rotates in the direction of arrow a in FIG. The brush roller 77 is formed by growing raised brushes 81 on the peripheral surface of the rotating roller 87. The nap 81 extends diagonally (upper left in FIG. 3) with respect to the rotation axis of the brush roller 77.
From 5, a lubricant can be applied.

When the cleaning unit 16 is at the position indicated by the solid line in FIG. 2, the brush roller 77 is in pressure contact with the surface of the intermediate transfer member 10 and rotates by frictional force with the intermediate transfer member 10. I do. By this rotation, the lubricant attached to the raised portion 81 of the brush roller 77 is supplied to the surface of the intermediate transfer member 10. The brush roller 77 is applied with a pressure sufficient to rotate by the frictional force with the intermediate transfer body 10 by the pressure spring 69, and the pressure is about 25N in the present embodiment.

Next, the operation of the first embodiment will be described based on the above configuration. The cleaning unit 16
When the toner is transferred from the photoconductor 1 to the intermediate transfer member 10, the toner is separated from the intermediate transfer member 10 via the release lever 73,
It moves to the position of the two-dot chain line in FIG. After the toner image is transferred from the intermediate transfer member 10 to the transfer paper 17A, the toner image moves to the position indicated by the solid line in FIG. 2, and the cleaning blade 67 and the brush roller 77 are pressed against the surface of the intermediate transfer member 10.

Brush roller 7 pressed against intermediate transfer member 10
Reference numeral 7 rotates by a frictional force with the intermediate transfer member 10. With this rotation, the raised brushes 81 of the brush roller 77 scrape the lubricant from each solid lubricant 75 and supply the lubricant to the intermediate transfer body 10. Since the solid lubricant 75 is divided into two parts, the length of the solid lubricant 75 can be reduced,
When the solid lubricant 75 is vibrated due to the rotation of the brush roller 77, the variation in the lubricant is reduced because the vibration width is small. Therefore, the lubricant can be uniformly supplied to the intermediate transfer member 10.

The raised brush 81 is pushed down by the load between the solid lubricant 75 and the sheet metal 79. However, when the brush roller 77 rotates and the solid lubricant 75 vibrates due to the rotation, the raised brush 81 is returned to its original position (by its return force). (The position of the raised portion 81 when the solid lubricant 75 is not disposed), the solid lubricant 75 moves in the direction of the arrow b in the figure. During the rotation of the brush roller 77, the solid lubricants 75 are constantly moved in the direction of the arrow b, so that the solid lubricants 75 stick together, and the gaps between the solid lubricants 75 can be easily filled. Lubricant can be adhered on the upper surface without gaps.

FIG. 4 is a graph showing the variation of the friction coefficient μ in the width direction of the surface of the intermediate transfer member 10 with the vertical axis representing the friction coefficient μ and the horizontal axis representing the width of the intermediate transfer member 10. In this graph, the broken line is used alone as in the prior art,
The results of measurement of the friction coefficient μ of the intermediate transfer body 10 when using a solid lubricant pressed against the brush roller 77 with a spring or the like are shown. The solid line is divided into two parts and pressed against the brush roller 77 by its own weight. 4 shows the results of measuring the friction coefficient μ of the intermediate transfer body 10 when the solid lubricant 75 thus used is used. In this measurement, as shown in FIG. 5, the measuring device 89 is connected to each rotating roller 1 of the intermediate transfer member 10.
It measured on the board 91 which passed horizontally between 1 and 12.

As is clear from this graph, when the conventional solid lubricant shown by the broken line is used, the variation in the friction coefficient μ, in other words, the amount of lubricant supplied to the intermediate transfer body 10 Is large. On the other hand, when the solid lubricant 75 of the present invention shown by the solid line is used, there is little variation. Therefore, it is understood that the lubricant can be uniformly supplied to the intermediate transfer member 10 by dividing the solid lubricant 75 into two.

Next, a second embodiment will be described. In the description, the same portions as those described above are denoted by the same reference numerals and description thereof will be omitted.

The second embodiment differs from the first embodiment only in that the fixed lubricant 76 is used alone instead of being divided into two, as shown in FIG. When the solid lubricant 76 is provided alone, the solid lubricant 76 is pressed against the raised brush 81 of the brush roller 77 by its own weight, and is not pressed by a spring or the like as in the related art, and the pressing force is small. In addition, the solid lubricant 76 does not easily bend or chip, and the lubricant can be supplied stably. During the rotation of the brush roller 77, the solid lubricant 75 is moved in the direction indicated by the arrow b in FIG.
Thus, the position of the solid lubricant 75 is stabilized, and the dispersion of the adhesion position of the lubricant due to the unstable position can be reduced, so that the lubricant can be more uniformly supplied to the intermediate transfer body 10.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. In the first embodiment, the solid lubricant 75 is divided into two parts. However, the solid lubricant 75 may be divided into a plurality of parts such as three or four parts. In this case, the dispersion of the lubricant attached to the raised brush 81 is further reduced.

In the present embodiment, the present invention is applied to a color copying machine, but the present invention is not limited to this. For example, the same operation and effect can be obtained even when applied to a monochrome copying machine, a laser printer, a laser facsimile, and the like. obtain.

[0055]

According to the first aspect of the present invention, since the solid lubricant is divided into a plurality of parts, the lubricant can be uniformly supplied to the image carrier.

According to the second aspect of the invention, since the solid lubricant is pressed against the rotating body by its own weight, the solid lubricant itself is hardly bent or chipped, and the lubricant can be supplied stably.

According to the third aspect of the present invention, the supply amount of the lubricant can be adjusted with a simple structure in which only the weight member is provided.

According to the fourth aspect of the present invention, since the elastic member reduces the impact at the time of pressing, the breakage of the solid lubricant is prevented.

According to the fifth aspect of the invention, the solid lubricant is further prevented from being damaged by forming the projecting portion on the weight member.

According to the sixth aspect of the present invention, since the solid lubricant is pressed against the rotating body by its own weight, the solid lubricant itself is unlikely to be bent or chipped, and the lubricant is uniformly applied to the image end holding member. Can supply.

According to the seventh aspect of the present invention, the supply amount of the lubricant can be adjusted with a simple structure only by providing the weight member.

According to the eighth aspect of the present invention, since the raising of the brush roller extends obliquely with respect to the rotation axis, the lubricant can be more uniformly supplied.

[Brief description of the drawings]

FIG. 1 is a configuration diagram schematically showing a color copying machine to which the present invention is applied.

FIG. 2 is an enlarged sectional view showing the vicinity of a cleaning device.

FIG. 3 is a configuration diagram schematically showing an enlarged view of the vicinity of a brush roller.

FIG. 4 is a graph showing a change in a friction coefficient of the surface of the intermediate transfer member.

FIG. 5 is a perspective view showing a state where the coefficient of friction of the surface of the intermediate transfer member is being measured by a measuring device.

FIG. 6 is an enlarged schematic view of the vicinity of a brush roller according to a second embodiment;

[Explanation of symbols]

 Reference Signs List 10 intermediate transfer member (photosensitive member) 63 lubricant supply device 75, 76 solid lubricant 77 brush roller 79 sheet metal (weight member) 79a projecting portion 81 brushed 83 elastic member

Claims (8)

[Claims] 1. A solid lubricant which is divided into a plurality of parts, and a rotating body which comes into contact with the solid lubricant and the image carrier and supplies the lubricant to the image carrier by rotation. Lubricant supply device. 2. The lubricant supply device according to claim 1, wherein each of the solid lubricants is disposed on the rotating body, and the solid lubricant is pressed against the rotating body by its own weight. 3. The lubricant supply device according to claim 1, wherein the solid lubricant is provided with a weight member that gives weight to each solid lubricant. 4. An elastic member which is pressed by the weight member when the solid lubricant moves to one end side of the rotating body is provided above and above one end of the rotating body. The lubricant supply device according to claim 3, wherein: 5. The lubricant supply device according to claim 4, wherein the weight member includes a projecting portion projecting from an end surface of the solid lubricant toward the elastic member. 6. A solid lubricant comprising: a solid lubricant; and a rotator that comes into contact with the solid lubricant and the image carrier, and supplies the lubricant to the image carrier by rotation. A lubricant supply device disposed above a body and pressed against the rotating body by its own weight. 7. The lubricant supply device according to claim 6, wherein the solid lubricant is provided with a weight member for giving weight to the solid lubricant. 8. The brush according to claim 1, wherein the rotating body is a brush roller having raised brushes on its peripheral surface, and the raised brush extends obliquely with respect to a rotation axis. The lubricant supply device according to claim 1.