JP2011180623A - Lubricant application device, process cartridge and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide: a lubricant application device preventing scattering of powdery lubricant to the surrounding, particularly in a casing when applying the powdery lubricant formed by chipping a solid lubricant with a brush roller to a photoreceptor; a process cartridge; and an image forming device. <P>SOLUTION: The lubricant application device includes: an image carrier (1); the solid lubricant (2) not in contact with the image carrier and disposed lower than the horizontal line through the axial line of the image carrier, when viewed in the section perpendicular to the axial line of the image carrier; and a brush member (3) rotatably disposed in contact with both the solid lubricant and the image carrier. A lubricant scattering prevention member 5 is provided downstream in the rotation direction of the brush member from the contact position of the brush member with the solid lubricant and upstream in the brush member rotation direction from the contact position of the image carrier with the brush member. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a lubricant application apparatus, a process cartridge, and an image forming apparatus that prevent lubricant scattering and apply a lubricant with high efficiency.

  The application of a lubricant to the photoreceptor is a well-known technique. When the application amount of the lubricant is insufficient, filming of the photoconductor and a large amount of wear of the cleaning blade occur. Cleaning with a conventional blade is difficult for polymerized toner or toner having a toner particle size of 6 μm or less. Therefore, in order to assist the cleaning with the blade, the toner contains silica having a large particle diameter (80 nm to 350 nm). The silica is deposited on the blade edge portion to prevent the toner from passing through. However, as a side effect due to the silica, there are problems such as photoconductor filming and abnormal wear of the cleaning blade. In order to prevent photoconductor filming due to silica and abnormal wear of the cleaning blade, it is necessary to apply a lubricant to the photoconductor.

  As a method of applying the lubricant, a method of applying the solid lubricant to the photoreceptor via a rotating brush roller is the most common from the viewpoint of cost, the number of parts, and the like. In the case of this method, when the bristles of the rotating brush roller get up and get up from the solid lubricant, and when the hair of the rotating brush roller gets up and gets up from the photoconductor, the solid lubricant shavings intervening in the brush roller are scattered around. There's a problem.

  That is, the lubricant application will be described with reference to FIG. 13. The solid lubricant 2 is in pressure contact with the brush roller 3, and the brush roller 3 rotates to form a powdery lubricant. The resulting lubricant is applied to the photoreceptor 1. However, when the rotating brush roller 3 comes into contact with the solid lubricant 2, the hair of the brush roller 3 falls, and when the brush brush 3 comes out of contact with the solid lubricant 2, the fallen hair rises. At that time, a restoring force acts on the hair of the brush roller 3 and the lubricant attached to the hair is scattered as shown in FIG. 14 to contaminate the image forming apparatus around the brush roller. Similarly, when the rotating brush roller 3 comes into contact with the photoreceptor 1, the hair of the brush roller 3 falls down, and when the brush roller 3 comes out of contact with the photoreceptor 1, the fallen hair rises. At that time, a restoring force acts on the hair of the brush roller 3 and the lubricant attached to the hair is scattered similarly to the above to contaminate the image forming apparatus around the brush roller.

  Conventionally, various measures have been taken to prevent such scattering of lubricant, and Patent Document 1 relating to the applicant's proposal is one example. However, in the case of Patent Document 1, the powder existing in the brush roller is cleaned, but since the lubricant is supplied to the photoconductor after cleaning, the hair of the rotating brush roller is solid. When the lubricant is lifted up and when it is lifted up and the photoconductor is lifted up, the solid lubricant shavings that have been interspersed with the brush roller scatter around the blade and frame, more specifically, the casing of the process cartridge. There is a problem of contaminating the inside.

  Therefore, the present invention solves the conventional problems as described above, and when the solid lubricant is scraped off by the brush roller and the powdered lubricant is applied to the photoconductor, its periphery, particularly around the brush roller. It is an object of the present invention to provide a lubricant application device, a process cartridge, and an image forming apparatus capable of preventing contamination by preventing powder lubricant from scattering into an image forming apparatus or a frame.

  In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an image carrier, and when viewed in a cross section perpendicular to the axis of the image carrier and non-contact with the image carrier, In the lubricant application device, comprising: a solid lubricant disposed below a horizontal line passing through the axis; and a brush member disposed rotatably in contact with both the solid lubricant and the image carrier. A lubricant scattering prevention member is provided on the downstream side in the rotation direction of the brush member from the contact position of the solid lubricant and on the upstream side in the rotation direction of the brush member from the contact position between the image carrier and the brush member.

  According to a second aspect of the present invention, in the lubricant application device according to the first aspect, both ends of the lubricant scattering preventing member are formed in a sheet shape, parallel to the axial direction of the image carrier, and from the brush member. When viewed in a cross section perpendicular to the axis of the image carrier, the one end is in contact with the solid lubricant and the other end is in contact with the image carrier.

  According to a third aspect of the present invention, in the lubricant application device of the second aspect, the contact portion between the image carrier and the solid lubricant in the lubricant scattering preventing member has a coefficient of friction of 0 with the image carrier and the solid lubricant. .20 or less.

  According to a fourth aspect of the present invention, in the lubricant application device according to the second or third aspect, the lubricant scattering preventing member is 0. 0 or less relative to the brush member when viewed in a cross section perpendicular to the axis of the image carrier. It has an arc shape with a gap of 5 mm to 5 mm.

  According to a fifth aspect of the present invention, in the lubricant application device according to any one of the first to fourth aspects, the lubricant scattering preventing member is a portion in contact with the solid lubricant when viewed in a cross section perpendicular to the axis of the image carrier. Is characterized in that the tangential direction of the lubricant scattering preventing member is 45 to 90 degrees from the horizontal line to the rotation direction of the brush member.

  According to a sixth aspect of the present invention, in the lubricant application device according to any one of the first to fifth aspects, the image forming member is located upstream from the contact position between the brush member and the solid lubricant in the brush member rotating direction, and A second lubricant scattering prevention member is provided on the downstream side in the brush member rotation direction from the contact position of the brush member.

  According to a seventh aspect of the present invention, in the lubricant application device according to any one of the first to sixth aspects, both end portions of the second lubricant scattering preventing member are formed in a sheet shape, and are arranged in the axial direction of the image carrier. When viewed in a cross section that is parallel and longer than the brush member and is perpendicular to the axis of the image carrier, one end is in contact with the solid lubricant and the other end is in contact with the image carrier. It is characterized by.

  According to an eighth aspect of the present invention, in the lubricant application device according to any one of the first to seventh aspects, the contact portion between the image carrier and the solid lubricant in the second lubricant scattering prevention member is an image carrier and a solid lubricant. The coefficient of friction with the lubricant is 0.20 or less.

  According to a ninth aspect of the present invention, in the lubricant application device according to any one of the first to eighth aspects, the second lubricant scattering prevention member is a brush member when viewed in a cross section perpendicular to the axis of the image carrier. On the other hand, it has an arc shape with a gap of 0.5 mm to 5 mm.

  According to a tenth aspect of the present invention, in the lubricant application device according to any one of the first to ninth aspects, the second lubricant scattering preventing member is a solid lubricant when viewed in a cross section perpendicular to the axis of the image carrier. The portion in contact with the second lubricant scattering prevention member is characterized in that the tangential direction of the second lubricant scattering prevention member is 45 to 90 degrees in the direction opposite to the rotation of the brush member from the horizontal line.

  The invention according to claim 11 is arranged below the horizontal line passing through the axis of the image carrier when viewed in a cross section perpendicular to the axis of the image carrier and non-contact with the image carrier. A solid lubricant, a brush member rotatably disposed in contact with both the solid lubricant and the image carrier, and a downstream position in the rotation direction of the brush member from a contact position of the brush member and the solid lubricant. A first lubricant scattering prevention member disposed upstream of the contact position between the image carrier and the brush member in the rotation direction of the brush member, and the rotation of the brush member from the contact position between the brush member and the solid lubricant. And a second lubricant scattering prevention member disposed on the downstream side in the rotation direction of the brush member from the contact position between the image carrier and the brush member, and further comprising the solid lubricant and the brush member Set at least one of A frame for, and first and second lubricant splash prevention member, characterized in that the integrally.

  According to a twelfth aspect of the present invention, in the lubricant application device of the eleventh aspect, both ends of the brush member and the solid lubricant are surrounded by a frame substantially perpendicular to the axial direction of the image carrier.

  According to a thirteenth aspect of the present invention, in the lubricant application device of the twelfth aspect, an elastic member is provided at an end of the frame surrounding both ends of the brush member and the solid lubricant, and the elastic member contacts the image carrier. It is characterized by that.

  According to a fourteenth aspect of the present invention, in the lubricant application device according to any one of the eleventh to thirteenth aspects, both end portions of the first and second lubricant scatter prevention members are formed into sheet-like members having good slidability. One end of the sheet-like member is brought into contact with the image carrier, and the other end is installed up to a position where the solid lubricant and the frame are in contact with each other.

  According to a fifteenth aspect of the present invention, in the lubricant application device according to the fourteenth aspect, the other end of the sheet-like member in contact with the frame and the solid lubricant is the lowermost part of the portion where the solid lubricant and the frame slide. It arrange | positions so that it may become lower.

  A sixteenth aspect of the present invention is the lubricant application apparatus according to the fifteenth aspect, wherein the sheet-like member provided on the first and second lubricant scattering prevention members is made into one sheet.

  The invention described in claim 17 is a process cartridge comprising at least an image carrier and the lubricant applying device according to any one of claims 1 to 16.

  According to an eighteenth aspect of the present invention, there is provided an image forming apparatus comprising the lubricant applying device according to any one of the first to sixteenth aspects or the process cartridge according to the seventeenth aspect.

  The present invention is as described above, and is located downstream of the contact position between the brush member and the solid lubricant in the rotation direction of the brush member, and upstream of the contact position between the image carrier and the brush member in the rotation direction of the brush member. Since the lubricant scattering prevention member is provided, when the brush member comes out of contact with the solid lubricant, when the brush member falls down, the fallen brush member's hair is raised, so that the lubricant forms an image around the brush roller. It is possible to prevent splashing into the device and the frame with the lubricant scattering prevention member, and it is possible to prevent the image forming device and the frame from being contaminated by the splashed lubricant as in the conventional case. I can expect.

1 is a schematic view of a process cartridge having a lubricant application device according to a first embodiment of the present invention. It is a principal part enlarged view same as the above. It is explanatory drawing which shows the angle of a lubricant scattering prevention member same as the above by contrast with a horizontal line. It is a fragmentary figure which shows the example which made the lubricant scattering prevention member the shape which is not circular arc shape. It is a fragmentary figure which shows the example made into the shape which stores the lubricant which scattered the lubricant scattering prevention member. It is a fragmentary figure which shows the example which comprised the lubricant scattering prevention member only with the sheet | seat. It is a consumption comparison table of the solid lubricant in a conventional device and a device using the present invention. It is the schematic which shows an example of the tandem type full color image forming apparatus provided with the process cartridge which has a lubricant coating apparatus. It is the schematic which shows the lubricant coating device concerning 2nd Embodiment, (A) is the perspective view of the edge part, (B) is a side view. It is a perspective view which shows the edge part of the casing which removed the photoconductor same as the above. It is sectional drawing which shows the inside of a casing same as the above. It is a modification of the sheet | seat of FIG. It is the schematic which shows a prior art example. It is a fragmentary figure for an effect | action description same as the above.

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

[First Embodiment]
FIG. 1 is a schematic view showing a lubricant application device, and FIG. 2 is an enlarged view of a main part thereof. In both figures, reference numeral 1 denotes a drum-shaped photoconductor as an image carrier, 2 a solid lubricant, and 3 a brush roller as a brush member. The brush roller 3 and the solid lubricant 2 are disposed below a horizontal line passing through the axis of the photoconductor 1 when viewed in a cross section perpendicular to the axis of the photoconductor 1. The brush roller 3 is disposed so as to be rotatable in contact with both the solid lubricant 2 and the photoreceptor 1. Lubricant scatters from the contact position between the brush roller 3 and the solid lubricant 2 downstream in the rotation direction of the brush roller 3 and upstream from the contact position between the photosensitive member 1 and the brush roller 3 in the rotation direction of the brush roller 3. The prevention member 5 is arranged. The lubricant scattering prevention member 5 is formed in an arc shape having a concave on the brush roller 3 side, and is provided integrally with the casing 4 of the process cartridge as a frame. A thin sheet 6 having good slidability is stretched on the inner surface thereof, and is arranged in parallel to the axial direction of the photoreceptor 1 and longer than the brush roller 3. When viewed in a cross section perpendicular to the axis of the photoreceptor 1, the sheet 6 has a leading end 6 a protruding from an opening described later in contact with the photoreceptor 1 and a base end 6 b in contact with the solid lubricant 2.

  The lubricant is located upstream from the contact position between the brush roller 3 and the solid lubricant 2 in the rotational direction of the brush roller 3 and downstream from the contact position between the photoreceptor 1 and the brush roller 3 in the rotational direction of the brush roller 3. An anti-scattering member 10 is disposed. The lubricant scattering prevention member 10 is formed in a circular arc shape having a concave on the brush roller 3 side, and is provided integrally with the casing 4 as described above. Similar to the lubricant scattering prevention member 5, a thin sheet 11 having good slidability is stretched on the inner surface thereof, and is arranged in parallel to the axial direction of the photoreceptor 1 and longer than the brush roller 3. Yes. When viewed in a cross section perpendicular to the axis of the photoreceptor 1, the sheet 11 has a leading end 11 a protruding from an opening described later in contact with the photoreceptor 1 and a base end 11 b in contact with the solid lubricant 2.

  The structure of the casing 4 in which the solid lubricant 2 is disposed will be described in more detail. The casing 4 serves as the lubricant scattering prevention members 5 and 10 and is formed in a circle formed in an opening having an opening on the side facing the photoreceptor 1. An arc-shaped portion and a box-shaped portion integrally connected to the side opposite to the opening of the portion, and these end portions (not shown) extend in the axial direction of the brush roller 3 and cover both end surfaces of the roller. And has a structure that does not open except for the opening. The brush roller 3 is concentrically disposed in the arc-shaped portion, and both end shafts thereof are supported by the end face portions. Thereby, a space 22 that is an annular gap is formed between the arc-shaped portion and the brush roller 3. In addition, a lubricant pressurizing spring 13 that urges the solid lubricant 2 so as to contact the brush roller 3 is provided at the bottom of the box-shaped portion.

  The base end portions 6b and 11b of the sheets 6 and 11 are preferably disposed so as to be lower than the lowermost portion of the portion where the solid lubricant 2 and the box-shaped portion of the casing 4 slide. If there is, the base end portions 6b and 11b may be separated from each other near the bottom of the box-shaped portion, or may be integrated with the inner surface of the bottom. When the base end portions 6b and 11b of the sheets 6 and 11 are disposed on the side surface of the solid lubricant 2 or disposed on the surface of the solid lubricant 2 on the brush roller side, the slidability of the solid lubricant 2 with respect to the casing is improved. The arrangement is as described above, because it deteriorates or the brush roller lubricant is scattered. Further, when the sheets 6 and 11 are integrated into one sheet, not only the scattering of the lubricant is prevented, but also the slidability of the solid lubricant 2 and the box-shaped portion of the casing 4 is improved. In addition, the efficiency of the mounting operation and the number of parts can be reduced, and the cost can be reduced.

  In FIG. 1, 7 is an intermediate transfer belt as an intermediate transfer member, 14 and 15 are a cleaning blade and a lubricant application blade disposed in a casing 4 before and after the photosensitive member 1 is rotated in the lubricant application device, 16 Is a charging roller, 17 is a pressure spring, 18 is a charging roller cleaner (cleaning roller), 19 is a pressure spring, 20 is a waste toner collecting coil, and 21 is a developing means whose details are not shown.

  When the lubricant scattering preventing member 5 is viewed in a cross section perpendicular to the axis of the photosensitive member 1 as shown in FIG. 3, the angle α of the portion in contact with the solid lubricant 2 is such that the tangential direction of the lubricant scattering preventing member 5 is It is desirable that the angle is 45 to 90 degrees in the rotation direction of the brush roller 3 from the horizontal line. Although not shown, the lubricant scattering prevention member 10 is the same, and the angle α of the portion in contact with the solid lubricant 2 is 45 in the direction tangential to the lubricant scattering prevention member from the horizontal line to the direction opposite to the rotation of the brush roller 3. It is desirable that the angle is 90 degrees. Further, the contact portion between the photoreceptor 1 and the solid lubricant 2 in the lubricant scattering prevention member 5 desirably has a coefficient of friction of 0.20 or less with respect to the photoreceptor and the solid lubricant. The same applies to the lubricant scattering prevention member 10, and the contact portion between the photoreceptor 1 and the solid lubricant 2 preferably has a coefficient of friction of 0.20 or less with respect to the photoreceptor and the solid lubricant.

  Here, the sheets 6 and 11 are provided over the entire inner surfaces of the lubricant scattering prevention member 5 and the lubricant scattering prevention member 10, but they do not necessarily have to be stretched over the entire surface. You may just do it. Further, the sheets 6 and 11 are separate from the lubricant scattering preventing member 5 and the lubricant scattering preventing member 10, but they may be integrated.

  In the above, the lubricant is scattered after the solid lubricant 2 and the rotating brush roller 3 come into contact with each other. The scattered lubricant is prevented from being scattered by the lubricant scattering preventing member 5, and the lubricant scattering preventing member 5 and the photosensitive member. 1, the lubricant scattered in the space 22 surrounded by the brush roller 3 and the solid lubricant 2 adheres to the brush roller 3 or the photoconductor 1 by the airflow generated by the rotation of the brush roller 3. Alternatively, the scattered lubricant returns to the solid lubricant 2 by gravity through the lubricant scattering preventing member 5. The lubricant that has returned after being scattered is supplied again by the brush roller 3, and the lubricant is applied to the photoreceptor 1.

  Similarly, the lubricant is scattered even after the photosensitive member 1 and the brush roller 3 are in contact with each other. The scattered lubricant is prevented from being scattered by the lubricant scattering preventing member 10, and the lubricant scattering preventing member 10, the photosensitive member 1, the brush The lubricant scattered in the space 22 surrounded by the roller 3 and the solid lubricant 2 is supplied to the brush roller 3 or returned onto the solid lubricant 2 by the air flow generated by the rotation of the brush roller 3. Alternatively, the scattered lubricant returns to the solid lubricant 2 by gravity through the lubricant scattering preventing member 5. The lubricant that has returned after being scattered is supplied again by the brush roller 3, and the lubricant is applied to the photoreceptor 1.

  As described above, since the lubricant that has been scattered in the blades 14 and 15 or the casing 4 and has not been applied to the photoreceptor 1 is also applied, the solid lubricant 2 is cut by the brush roller 3. The amount can be reduced and the life of the solid lubricant 2 can be improved. In other words, by integrating the lubricant scattering prevention members 5 and 10 and the casing 4, the lubricant is outside the space 22 on the upstream and downstream sides in the brush roller rotation direction at the position where the brush roller 3 and the solid lubricant 2 are in contact with each other. Is prevented from scattering into the casing 4.

  For example, FIG. 4 shows that the lubricant scattering preventing member 5 ′ has a linear shape that is not an arc and is not close to the brush roller 3. In this way, the lubricant scattering preventing member 5 ′ In the case of a shape that is not in the shape of an arc and is not close to the brush roller 3, the scattered lubricant is less likely to adhere to the brush roller 3 and the photoreceptor 1, and is more solid than that shown in FIGS. The consumption amount of the lubricant 2 is increased. Further, as shown in FIG. 5, when the lubricant scattering preventing member 5 ″ is viewed in a cross section perpendicular to the axis of the photoreceptor 1, the portion in contact with the solid lubricant 2 is the tangential direction of the lubricant scattering preventing member 5 ″. Has a negative angle with respect to the horizontal line, the scattered lubricant is accumulated in the recess, and the lubricant cannot be returned to the brush roller 3 and the solid lubricant 2 again. Therefore, the consumption amount of the conventional solid lubricant is required. Further, as shown in FIG. 6, when the lubricant scattering prevention members 5 ′ ″ and 10 ′ ″ are composed of a sheet-like member, the function / effect is not changed. As a result, the lubricant scattering preventing members 5 ′ ″ and 10 ′ ″ come into contact with the brush roller 3 and it becomes difficult to achieve the desired lubricant application amount. Therefore, it is necessary to compensate with a non-deformable material that suppresses deformation of the sheet member.

  In the case of this embodiment, the lubricant is scattered in the space 22 in the photosensitive member 1, the solid lubricant 2 and the brush roller 3 by installing the two lubricant scattering preventing members 5 and 10 as described above. Can be prevented. In addition, the consumption of the solid lubricant 2 can be reduced, and the life of the solid lubricant can be extended.

  That is, by installing the lubricant scattering prevention member 5, the lubricant scattered after the rotating brush roller 3 passes through the solid lubricant 2 is used as the lubricant scattering prevention member 5, the photoreceptor 1, the brush roller 3, and the solid lubrication. The casing 4 is prevented from being contaminated by being scattered in the space 22 surrounded by the agent 2 and not being scattered from the opening. The lubricant scattering preventing member 5 is formed in an arc shape and the gap between the brush roller 3 and the lubricant scattering preventing member 5 is set to 0.5 mm to 5 mm, so that an air flow generated by the rotation of the brush roller 3 can be used. A lubricant is adhered to the roller 3 or the photoreceptor 1. Alternatively, the lubricant scattered by the gravity drop is attached to the solid lubricant 2.

  Further, by installing the lubricant scattering prevention member 10, the lubricant scattered after the rotating brush roller 3 passes through the photoreceptor 1 is used as the lubricant scattering prevention member 10, the photoreceptor 1, the brush roller 3, and the solid lubricant. The inside of the casing 4 is prevented from being contaminated by being scattered in the space 22 surrounded by 2 and not being scattered from the opening. The lubricant scattering prevention member 10 is formed in an arc shape, and the clearance between the brush roller 3 and the lubricant scattering prevention member 10 is set to 0.5 mm to 5 mm, so that the brush roller can be used by utilizing the air flow generated by the rotation of the brush roller 3. 3 or the solid lubricant 2 is adhered to the solid lubricant 2 or the lubricant dispersed by gravity drop is adhered to the solid lubricant 2. Therefore, the lubricant that has been scattered and has not been applied to the photosensitive member 1 can be applied to the photosensitive member, the amount of cutting the solid lubricant 2 with the brush roller 3 can be reduced, and the life of the solid lubricant can be reduced. Can be improved.

Using the lubricant scattering prevention members 5 and 10, actual paper passing evaluation was performed. A comparison was made between an image forming apparatus having no conventional scattering prevention member and an image forming apparatus having the scattering prevention member of the present invention.
The paper passing conditions are as follows. The evaluation was made after the completion of paper passing, based on the amount of lubricant consumed and the contamination due to the scattering of lubricant around the brush.
Machine: Ricoh Imagio MP C3000 remodeling machine Environment: Laboratory environment Paper feed image: 5% chart Job interval: 100 continuous paper passes Total paper pass: 10,000 Evaluation results: As shown in FIG. The consumption was reduced by 30% compared to the conventional one. Further, as shown in Table 1, it was found from the contamination state determination result due to the scattering of the lubricant around the brush that the present invention has an effect of preventing the scattering compared to the conventional product.

  According to the lubricant scattering prevention device as described above, the solid lubricant 2 is in pressure contact with the brush roller 3, and when the brush roller 3 rotates, it becomes a powdery lubricant, which is in powder form. The lubricant thus formed is applied to the photoreceptor 1. When the rotating brush roller 3 comes into contact with the solid lubricant 2, the hair of the brush roller 3 falls, and when the brush brush 3 comes out of contact with the solid lubricant 2, the fallen hair rises. At that time, a restoring force acts on the bristles of the brush roller 3 and the lubricant attached to the bristles scatters and contaminates the casing 4 around the brush rollers. Similarly, when the rotating brush roller 3 comes into contact with the photoreceptor 1, the hair of the brush roller 3 falls down, and when the brush roller 3 comes out of contact with the photoreceptor 1, the fallen hair rises. At that time, a restoring force acts on the bristles of the brush roller 3 and the lubricant is scattered to contaminate the inside of the casing 4 around the brush roller. The scattered lubricant is separated into the space 22 by the lubricant scattering preventing members 5 and 10. It is retained inside and is prevented from scattering from the space 22 through the opening.

  In the process cartridge (PCU) shown above, the surface of the photoreceptor 1 is uniformly charged by the charging roller 16. As the charging device, there are a scorotron method, a corotron method which is charging by a wire, a contact roller charging method using a medium resistance rubber roller, and a non-contact roller charging method, but here, a non-contact roller charging method is adopted.

  For both the contact roller charging method and the non-contact roller charging method, there are a method of superimposing alternating current on direct current and a method of applying only direct current. In the contact roller charging method, when alternating current is superimposed on direct current, high image quality can be obtained as compared with direct current, but attention must be paid to the problem of photoconductor filming. In addition, the constant current control of alternating current has the advantage that the surface potential is not affected by fluctuations in the resistance value of the charging roller due to environmental changes. It is as. When only a direct current is applied, a change in the resistance value of the charging roller due to the environmental change affects the surface potential with respect to the environmental change, and some means for correcting the applied voltage is required.

  In the non-contact roller charging method, in the case of non-contact, when alternating current is controlled at a constant current, the image is uneven due to the influence of the gap fluctuation between the photosensitive member 1 and the charging roller 16, so that only DC is applied. Similarly, a means for correcting the applied voltage is required. However, since it is non-contact, there is a margin for contamination of the charging roller 16 compared to the contact type. As a correction method, there are a method of detecting the temperature in the vicinity of the charging roller and switching the applied voltage, a method of periodically detecting ground contamination on the photosensitive member and switching the applied voltage, and a method of determining the applied voltage based on a feedback current value. is there. By taking these methods, the surface of the photoreceptor is charged to about -500V to -700V. As a driving method, there are a method in which the photosensitive member is brought into pressure contact and is rotated by a frictional force, and a method in which a driving force is obtained from a photosensitive member gear or the like. In the case of a low speed machine, the former method is often used, but in the machine that requires high speed and high image quality, the latter method is often used.

  In the cleaning roller, when the surface of the charging roller becomes dirty, the charging capability of the contaminated portion is reduced and the photosensitive member cannot be charged to the target potential. As a result, an abnormal image of defective charging appears. In order to prevent this, a charging roller cleaner (cleaning roller) 18 is abutted. The charging roller cleaner 18 includes a flocking roller in which fibers are electrostatically flocked on a metal shaft, and a melamine roller in which a melamine resin is disposed on the roller around the metal shaft. In most cases, a melamine roller is used. When slip occurs between the cleaning roller 18 and the charging roller 16, dirt is rubbed against the surface of the charging roller, and the generation of abnormal images due to the dirt is accelerated. The charging roller cleaner 18 is rotated around the charging roller 16 without being particularly driven, so that the surface of the charging roller is cleaned. When the drive is applied, a slipping state is inevitably caused by the tolerance of the charging roller diameter and the diameter tolerance of the charging roller cleaner, and the life is shortened. Ideally, it is desirable that the surface moving speed is the same at the contact portion between the charging roller 16 and the cleaning roller 18 (no slip).

  The cleaning blade 14 and the waste toner conveyance path will be described. The cleaning blade 14 is a method in which urethane rubber is brought into contact with the surface of the photosensitive member 1 in the counter direction, and the remaining toner after transfer is scraped off at the edge portion. Is the most commonly used method. In the waste toner transport path, the toner scraped off by the cleaning blade 14 is transported by the waste toner collecting coil 20 and stored in the waste toner tank (the stored waste toner is not reused).

  Next, the lubricant will be described. In order to stabilize the friction coefficient of the surface of the photoreceptor 1 at a low level, a lubricant is applied to the surface of the photoreceptor. This is performed to prevent photoconductor filming. The lubricant is in pressure contact with the lubricant application brush roller, and is gradually scraped as the lubricant application brush roller 3 rotates, and the shaved lubricant is applied to the surface of the photoreceptor. The lubricant applied to the surface of the photoreceptor by the lubricant application brush roller 3 is fixed to the surface of the photoreceptor with a uniform thickness by the lubricant application blade 15. The most commonly used lubricant is ZnSt (zinc stearate). As the brush roller 3, insulating PET, conductive PET, acrylic fiber, or the like is used.

  FIG. 8 shows an example of a tandem type full-color image forming apparatus provided with a process cartridge (PCU) having the above-described lubricant coating apparatus. Here, an example of a process cartridge using a photoreceptor is shown. However, it can be used with an image carrier including intermediate transfer and secondary transfer.

  In the figure, reference numeral 100 denotes an image forming apparatus main body, and reference numeral 200 denotes an image reading apparatus mounted on the image forming apparatus main body 100. In the image forming apparatus main body 100, four image forming stations 110c, 110m, 110y, and 110b of cyan, magenta, yellow, and black are arranged in tandem. Each image forming station is provided with a drum-shaped photoconductor 1 as an image carrier. As the image forming station rotates clockwise in the figure, a bias voltage is first applied by each charging device including a charging roller to make the back surface uniform. Charges up. Next, writing is performed by irradiating laser light from the common writing device 113 based on a read signal from the image reading device 200, thereby forming an electrostatic latent image on the photoreceptor 1. After that, each developing device attaches toner as powder to visualize the electrostatic latent image, and forms a single color image for each color on the photoreceptor 1.

  Then, the endless belt-shaped intermediate transfer belt 7 is brought into contact with the photosensitive member and travels counterclockwise in the drawing, and each color monochrome image on the photosensitive member 1 is sequentially transferred from cyan to the intermediate transfer member 7 by each primary transfer device. The primary transfer is performed, and the transfer images are superimposed to form a full-color image on the intermediate transfer belt 7.

  On the other hand, one of the feed rollers 120 is selectively rotated at an appropriate timing, the recording medium P is fed out from the corresponding paper feed cassette 121 in the image forming apparatus main body 100, and conveyed through the recording medium conveyance path 123 to be paired. It stops by abutting between the registration rollers 124. Then, the pair of registration rollers 124 are rotated in synchronization with the full color image on the intermediate transfer body 7, and the full color image is secondarily transferred to the recording medium P by the secondary transfer device 125. Thereafter, the recording medium P after full-color image transfer is conveyed upward as it is through the recording medium conveyance path 123, and unfixed transfer toner is fixed to the recording medium P when passing through the fixing nip of the fixing device 122, and the discharge roller 126. And are stacked on the paper discharge stack device 127 on the image forming apparatus main body 100.

[Second Embodiment]
9A and 9B are schematic views showing a lubricant application device, where FIG. 9A is a partial perspective view thereof, FIG. 9B is a side view thereof, and FIG. A perspective view and FIG. 11 are sectional views showing the inside of the casing. In this embodiment, most of the configuration is the same as that of the above-described embodiment, so that the same reference numerals are given to the same portions and the description is omitted, and only different portions will be described below. The lubricant application device according to the first embodiment described above also has the following problems. In other words, the openings of the lubricant scattering prevention members 5 and 10 are surrounded by the sheets 6 and 11, but the sheet alone cannot close the gaps at both ends, and both ends of the brush roller 3 and the solid lubricant 2 are covered. The lubricant may scatter from the gaps between the parts. Therefore, in order to increase the sealing property in the frame of the lubricant application device and prevent the lubricant from scattering, the embodiments shown in FIG. 9 and subsequent drawings have been created.

  That is, in this embodiment, both ends of the brush roller 3 and the solid lubricant 2 are surrounded by a casing 34 as a frame substantially perpendicularly to the axial direction of the photosensitive member 1, whereby the solid lubricant 2 and the brush roller 3. The lubricant is prevented from scattering from the gaps at both end portions that come into contact with each other. An elastic member 36 is disposed on the end surface portion of the arc-shaped portion of the casing 34. The elastic member 36 comes into contact with the surface of the photosensitive member 1 together with the front end portions 6 a and 11 a of the sheets 6 and 11 protruding from the opening of the arc-shaped portion of the casing 34. Also in this case, as shown in FIG. 11, the base end portions 6b and 11b of the sheets 6 and 11 are arranged so as to be below the lowermost portion of the portion where the solid lubricant 2 and the box-shaped portion of the casing 34 slide. It is desirable to do. Here, an example is shown in which the base ends 6b and 11b are separated from each other near the bottom of the box-shaped part. However, as shown in FIG. May be. If such sheets 6 and 11 are integrated into one sheet, not only the scattering of the lubricant is prevented, but also the slidability of the solid lubricant 2 and the box-shaped portion of the casing 34 is improved. In addition, the efficiency of the mounting operation and the number of parts can be reduced, and the cost can be reduced. Although the casing 34 is not formed as a process cartridge here, it goes without saying that it may be formed as a process cartridge in the same manner as in the first embodiment.

  In the above, by providing the sheets 6 and 11 and the elastic member 36 that are in contact with the surface of the photoconductor 1, the gap between both ends of the photoconductor 1 and the casing 34 is closed and sealed, and the brush roller 3 and the solid lubricant 2 are sealed. It is possible to almost completely prevent the lubricant from scattering from the gaps at both ends.

  Similarly to the first embodiment, the lubricant coating apparatus of this embodiment can also be installed and used in the image forming apparatus shown in FIG.

  The image forming apparatus is not limited to the example having the PCU as in the first embodiment, but the PCU is not installed, but the second embodiment having only a lubricant coating device independent from the PCU is installed. It may be like a form. In addition, the structure of the casing of the PCU shown in FIGS. 1 and 2 and the shapes of the lubricant scattering preventing member 5 and the lubricant scattering preventing member 10 integrally formed with the casing are merely shown as preferable examples. Different types are not excluded, and various modifications can be made in the implementation, such as the lubricant scattering prevention member 5 without the lubricant scattering prevention member 10 or the like.

Next, a characteristic effect of the invention described in claim 2 and the following claims will be described.
According to the lubricant application device of the second aspect of the present invention, by bringing one end of the lubricant scattering preventing member into contact with the solid lubricant and the other end into contact with the image carrier, Spattering can be reliably prevented. According to the third aspect of the invention, the solid lubricant needs to improve the slidability of the solid lubricant in order to contact the brush member at a constant pressure. By using the member, the same slidability as the current state can be maintained. Further, wear of the image carrier can be suppressed.

  According to the invention of the lubricant application device of the fourth aspect, the scattered lubricant adheres to the brush member or the image carrier, and wasteful lubricant can be reduced, so that consumption of the solid lubricant can be suppressed. According to the invention of the lubricant application device according to claim 5, the scattered lubricant is adhered to the brush member or the solid lubricant by the air flow generated by the rotation of the brush member or the gravity drop, so that the scattered lubricant is Can adhere to the photoreceptor. Therefore, the consumption amount of the solid lubricant can be reduced, and the life of the solid lubricant is improved. According to the invention of the lubricant application device of the sixth aspect, when the brush member is brought into non-contact from the state in which the brush member is in contact with the image carrier, the hair of the brush member that has fallen is raised, Scattering of the lubricant can be prevented by the second lubricant scattering preventing member.

  According to the invention of the lubricant application device according to claim 7, by bringing one end of the second lubricant scattering preventing member into contact with the solid lubricant and the other end into contact with the image carrier, Lubricant leakage can be reliably prevented. According to the lubricant application device of the present invention, the solid lubricant needs to improve the slidability of the solid lubricant in order to be brought into contact with the brush member at a constant pressure. By using the member, the same slidability as the current state can be maintained. Further, wear of the image carrier can be suppressed. According to the invention of the lubricant application device of the ninth aspect, the scattered lubricant adheres to the brush member or the solid lubricant, and wasteful lubricant can be reduced, so that consumption of the solid lubricant can be suppressed. According to the invention of the lubricant application device according to claim 10, the scattered lubricant is adhered to the brush member or the solid lubricant by the air flow generated by the rotation of the brush member or the gravity drop, so that the scattered lubricant is Can adhere to the photoreceptor. Therefore, the consumption amount of the solid lubricant can be reduced, and the life of the solid lubricant is improved.

  According to the invention of the lubricant application device of the eleventh aspect, in addition to being able to prevent the scattering of the lubricant as in the invention of the lubricant application device of the first aspect, the solid lubricant and the brush The lubricant that scatters in the axial direction of the image carrier from the gaps at both ends of the member, the image carrier, and the brush member can be prevented from being scattered by sealing the gap between the image carrier and the frame. In addition, by integrating the first and second lubricant scattering prevention members and the frame, the number of parts can be reduced, the mounting work can be omitted, the cost can be reduced, and the sealing performance can be improved as compared with the conventional example. it can.

  According to the invention of the lubricant application device of the twelfth aspect, it is possible to prevent the scattering of the lubricant with respect to the axial direction of the image carrier at both ends of the brush member and the solid lubricant. According to the invention of the lubricant application device of claim 13, the solid lubricant and the brush roller, the image carrier and the lubricant scattered in the axial direction of the image carrier from both ends of the brush roller, the image carrier and The gap in the frame can be sealed to prevent scattering. According to the invention of the lubricant application device of the fourteenth aspect, the slidability of the contact portion between the frame and the solid lubricant can be improved. In addition, by using a single sheet-like member from the image carrier and the contact portion to the solid lubricant and the frame contact portion, it is possible to increase the efficiency of the mounting operation and reduce the material cost.

  According to the lubricant application device of the fifteenth aspect, the slidability of the contact portion between the frame and the solid lubricant can be improved. According to the lubricant application device of the sixteenth aspect, the number of parts can be reduced, the efficiency of the mounting operation can be reduced, and the cost can be reduced.

  According to the invention of the process cart cartridge described in claim 17, an inexpensive and long-life process cart cartridge is provided by utilizing the invention of the lubricant application device described in any one of claims 1 to 16. can do. According to the image forming apparatus of the present invention, the lubricant application apparatus according to any one of claims 1 to 16 or the process cartridge according to claim 17 is used to reduce the cost. An image forming apparatus having a long lifetime can be provided.

1 Photoconductor (image carrier)
2 Solid lubricant 3 Brush roller (brush member)
4 Casing (frame)
5 Lubricant splash prevention member (first lubricant splash prevention member)
6, 11 Sheet 6a, 11a Front end 6b, 11b Base end 7 Intermediate transfer belt (intermediate transfer member)
10 Lubricant splash prevention member (second lubricant splash prevention member)
13 Lubricant pressure spring 14 Cleaning blade 15 Lubricant application blade 22 Space 36 Elastic member 100 Image forming apparatus main body 110c, 110m, 110y, 110b Image forming station 200 Image reading apparatus

JP 2001-337558 A

Claims (18)

  When viewed in a cross section perpendicular to the axis of the image carrier without contact with the image carrier, the solid lubricant disposed below the horizontal line passing through the axis of the image carrier, and the solid carrier In a lubricant application device having a brush member disposed so as to be able to rotate in contact with both the lubricant and the image carrier, the brush member is located on the downstream side in the rotation direction of the brush member from the contact position of the solid lubricant, And a lubricant scattering preventing member provided on the upstream side of the contact position between the image carrier and the brush member in the direction of rotation of the brush member.   2. The lubricant application apparatus according to claim 1, wherein both ends of the lubricant scattering preventing member are formed in a sheet shape, are parallel to the axial direction of the image carrier and are longer than the brush member. When viewed in a cross section perpendicular to the axis, the lubricant application device is characterized in that one end is in contact with the solid lubricant and the other end is in contact with the image carrier.   3. The lubricant application device according to claim 2, wherein the contact portion between the image carrier and the solid lubricant in the lubricant scattering preventing member has a coefficient of friction of 0.20 or less with the image carrier and the solid lubricant. Lubricant application device.   4. The lubricant application device according to claim 2, wherein the lubricant scattering preventing member is an arc having a gap of 0.5 mm to 5 mm with respect to the brush member when viewed in a cross section perpendicular to the axis of the image carrier. A lubricant application device having a shape.   5. The lubricant application apparatus according to claim 1, wherein when the lubricant scattering preventing member is viewed in a cross section perpendicular to the axis of the image carrier, a portion in contact with the solid lubricant is a tangential direction of the lubricant scattering preventing member. The lubricant application device is characterized in that the angle is 45 degrees to 90 degrees in the rotation direction of the brush member from the horizontal line.   6. The lubricant application device according to claim 1, wherein the brush member rotates upstream from the contact position between the brush member and the solid lubricant in the direction of rotation of the brush member and from the contact position between the image carrier and the brush member. A lubricant application device comprising a second lubricant scattering prevention member on the downstream side in the direction.   7. The lubricant application device according to claim 1, wherein both ends of the second lubricant scattering preventing member are formed in a sheet shape, are parallel to the axial direction of the image carrier and are longer than the brush member. The lubricant application device is characterized in that when viewed in a cross section perpendicular to the axis of the image carrier, one end is in contact with the solid lubricant and the other end is in contact with the image carrier.   8. The lubricant application apparatus according to claim 1, wherein a contact coefficient between the image carrier and the solid lubricant in the second lubricant scattering prevention member has a coefficient of friction of 0. 0 with the image carrier and the solid lubricant. Lubricant coating apparatus characterized by being 20 or less.   9. The lubricant application device according to claim 1, wherein the second lubricant scattering preventing member has a width of 0.5 mm to 5 mm with respect to the brush member when viewed in a cross section perpendicular to the axis of the image carrier. A lubricant application device having an arc shape with a gap.   10. The lubricant application device according to claim 1, wherein when the second lubricant scattering preventing member is viewed in a cross section perpendicular to the axis of the image carrier, the portion in contact with the solid lubricant is the second lubricant. The lubricant application device, wherein the tangential direction of the scattering prevention member is 45 to 90 degrees in the direction opposite to the rotation of the brush member from the horizontal line.   When viewed in a cross section perpendicular to the axis of the image carrier without contact with the image carrier, the solid lubricant disposed below the horizontal line passing through the axis of the image carrier, and the solid carrier A brush member disposed so as to be rotatable in contact with both the lubricant and the image carrier, and a downstream side in the rotation direction of the brush member from a contact position of the brush member and the solid lubricant, and the image carrier and the brush member A first lubricant scattering prevention member disposed upstream of the contact position of the brush member in the rotational direction of the brush member, and an upstream side of the brush member in the rotational direction of the brush member from the contact position of the brush member and the solid lubricant. A second lubricant scattering preventing member disposed downstream of the contact position between the body and the brush member in the rotational direction of the brush member, and further installing at least one of the solid lubricant and the brush member A frame and first and Lubricant applicator being characterized in that the integral and a second lubricant splattering preventive member.   12. The lubricant application device according to claim 11, wherein both ends of the brush member and the solid lubricant are surrounded by a frame substantially perpendicular to the axial direction of the image carrier.   13. The lubricant applying apparatus according to claim 12, wherein an elastic member is provided at an end of a frame surrounding both ends of the brush member and the solid lubricant, and the elastic member is in contact with the image carrier. Agent applicator.   14. The lubricant application device according to claim 11, wherein both end portions of the first and second lubricant scatter preventing members are formed into a slidable sheet-like member, and one of the sheet-like members is formed. An apparatus for applying a lubricant, wherein one end is brought into contact with an image carrier, and the other end is installed up to a place where the solid lubricant contacts the frame.   15. The lubricant application device according to claim 14, wherein the other end of the sheet-like member in contact with the frame and the solid lubricant is disposed below the lowermost part of the portion where the solid lubricant and the frame slide. A lubricant application device characterized by the above.   16. The lubricant application device according to claim 15, wherein the sheet-like member provided on the first and second lubricant scatter preventing members is made into one sheet.   A process cartridge comprising at least an image carrier and the lubricant application device according to claim 1.   An image forming apparatus comprising the lubricant application device according to claim 1 or the process cartridge according to claim 17.

Images