JPH01259392A - Water repelling material applying device for photosensitive body - Google Patents

Abstract

PURPOSE:To effectively apply a water repelling material to a photosensitive body by allowing an applying roller to be brought into contact with the photosensitive body and the water repelling material at the time of applying the water repelling material, and separating the applying roller from the photosensitive body and the water repelling material at the time of non-application. CONSTITUTION:An applying roller 2 is held by an applying roller holder 11 so as to be brought into contact with and to be separated from the surface of a photosensitive body 1. Also, by a water repelling material holder 15, a water repelling material 3 is held so as to be brought into contact with and to be separated from the roller 2. In this state, by the operation of the holder 11 and 15 by an operating member 12, application is executed by allowing the roller to be brought into contact with both the photosensitive body 1 and the water repelling material 3 at the time of application, and at the time of non-application, the roller 2 is separated from not only the photosensitive body but also the water repelling material 3. Also, at the time of application, it is also possible that the applying roller 22 applies a water repelling material 23 to the photosensitive body 1 at speed being different from that of the photosensitive body, and also, while bringing it to reciprocating movement in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for applying a water-repellent material to a photoreceptor of a copying machine, a printer, a facsimile, etc., particularly a photoreceptor whose surface layer is formed of a resin layer.

[Prior Art] Conventionally, photoreceptors such as those described above are used in high temperature, high humidity environments, or when humidity changes rapidly.

There is a problem in that dew condensation forms on the surface of the photoreceptor, causing the image to become blurry or less sharp, resulting in a decrease in resolution.This phenomenon occurs especially when the photoreceptor is used for a long period of time, and the surface becomes rough. If this happens, it will occur frequently.

Therefore, in order to prevent this, a water repellent material made of high viscosity liquid or semi-solid silicone oil is applied to the surface layer to prevent moisture from adhering, or a cleaning member is used to prevent moisture from adhering. Attempts are being made to eliminate this.

However, an appropriate device for applying this to a photoreceptor has not yet been proposed, and two conventionally known typical examples that are similar to this are shown in Figure 5 (
There are outlines shown in A) and (B), which will be explained below.

1 indicates a photoreceptor; in (8), 52 indicates a solid lubricant made of a metal salt such as zinc stearate; 53 indicates a fur brush; As shown in the figure, the brush 53 is used to scrape off the lubricant 52 and apply it to the surface of the photoreceptor 1 in powder form. 54 indicates a cleaning blade. Further, in (B), 55 is a rubber roller, which is impregnated with oil and applied to the photoreceptor 1.

・, [Problem to be solved by the invention] In the case of the above (A), since the application member consists of the brush 53, the water-repellent material made of the above-mentioned material is uniformly applied to the surface of the photoreceptor 1. A problem arises in that it is difficult to apply.

Next, a similar phenomenon is observed in the case of (B), in which toner locally adheres to the surface of the roller 55, again causing a problem that it becomes difficult to uniformly apply the oil.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems caused by the conventional coating devices as described above, and to provide a coating device that can always coat a water-repellent material uniformly on the surface of a photoreceptor, regardless of long-term use. is to provide.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention is provided in claim 1.
The apparatus described in 1 includes a coating roller holder 11 that holds the coating roller 2 on the surface of the photoreceptor 1 so as to be able to come into contact with and separate from it, and a water repellent material that holds the water repellent material 3 on the coating roller 2 so that it can come into contact with and separate from it. The image holder 11.15 includes a material holder 15 and an actuating member 12 for moving the image holders 11.15 toward and away from the image holders 11.15. When the water-repellent material 3 contacts the application roller 2, and when the application roller 2 separates from the surface of the photoreceptor 1, the water-repellent material 3 separates from the application roller 2. It is something to do.

Further, the apparatus according to claim 2 is characterized in that the speed of the photoreceptor 1 and the speed of the application roller 22 are set to different speeds, and the application roller 22 is installed so as to reciprocate in the axial direction. It is something to do.

[Function] In the apparatus according to claim 1, the application roller 2 is connected to the photoconductor 1 in a water-repellent manner during application by the operation of the application roller holder 11 and the water-repellent material holder 15 by the operating member 12. The application roller 2 is placed in contact with both the photoreceptor 1 and the water-repellent material 3, and when not applied, the application roller 2 is separated not only from the photoreceptor 1 but also from the water-repellent material 3.

Next, in the apparatus according to claim 2, during coating, the coating roller 22 applies the water-repellent material 23 to the photoconductor 1 at a speed different from that of the photoconductor 1, while reciprocating in the axial direction.
is applied to the photoreceptor 1.

[First Embodiment] In the embodiment of the invention according to claim 1 shown in FIGS. 1 and 2, 1 indicates a photoreceptor, the surface layer of which is coated with a resin protective film of about 1 to 10 μm, This is to prevent image deterioration due to unevenness such as black streaks, white streaks, and black bands due to filming due to damage to the photoreceptor 1, and the resin used at this time is styrene-acrylic. In order to provide electrical properties, fine powder of a conductive substance is dispersed and mixed into the resin to provide the desired conductivity.

Reference numeral 2 denotes a coating roller, which is made of a material such as soft foamed silicone or polyurethane, or is made of such a material with a thin film surface layer formed thereon, and is swingable by a support shaft 10 on a machine frame (not shown). Holder 1 pivoted to
1 is rotatably supported.

3 is a water-repellent material made of highly viscous liquid or semi-solid silicone oil, or a sponge, felt, wax, etc. impregnated with the water-repellent material in the case 4;
The case 4 is attached to the tip of a holder 15 that is swingably supported on the holder 7 by a support shaft 14.
The rear end is a link 13 connected to the operating rod of the solenoid 12.
The other end of the spring 16, which has one end fixed to the machine frame, is fixed to the opposite side of the holder 15.
is provided with a locking piece that locks onto the upper edge of the holder 11 in the separated position shown in the second figure.

Reference numeral 5 indicates a scraper for scooping up unnecessary material adhering to the coating roller 2, 6 indicates a cleaning blade, and 7 indicates a fur brush.

In the embodiment described above, when applying the water-repellent material, the solenoid 12 is activated to rotate the holder 15 counterclockwise about the support shaft 14, and the water-repellent material 3 pushes the application roller 2, thereby removing the holder. 11 in the same direction about the support shaft 10 to bring the application roller 2 into contact with the rotating photoreceptor 1.

The application roller 2 is rotated faster or slower than the rotational speed of the photoreceptor 1 by an operating member (not shown), or the application roller 2 is rotated at a speed faster or slower than the rotation speed of the photoreceptor 1 by an operating member (not shown), or the application roller 2 is rotated at a speed faster or slower than the rotation speed of the photoreceptor 1 without providing an operating member.
It rotates in sync with it due to contact friction with it. As a result, the water-repellent material 3 is applied onto the surface of the photoreceptor 1.

By the way, since the water repellent material 3 is made of a highly viscous liquid or semi-solid material as described above, when the photoreceptor 1 is stopped for a long time, it is left in the state shown in Fig. 1. Then, only the water-repellent material 3 in the portion of the application roller 2 that is in contact with the photoreceptor 1 adheres to the photoreceptor 1, and the amount of water-repellent material 3 in this portion becomes larger than that in other portions. Therefore, when the photoreceptor 1 is rotated again, the water-repellent material 3 tends to adhere to anything that comes into contact with the photoreceptor 1, leading to quality deterioration.In addition, the water-repellent material 3 tends to adhere to anything that comes into contact with the photoreceptor 1, leading to quality deterioration, and image deterioration due to scattering stains on the charger, stains on the optical system, etc. In this case, it is necessary to keep the coating roller 2 apart from the photoreceptor 1.

Furthermore, if the water-repellent material 3 is left in contact with the application roller 2 at this time, a large amount of the water-repellent material 3 will adhere to the part of the application roller 2 that is in contact with the water-repellent material 3, and the photoconductor 1 will be coated with water-repellent material 3. At the time of re-rotation, a large amount of the water repellent material 3 is applied locally in exactly the same manner as described above, causing inconvenience, so it is necessary to keep the water repellent material 3 separated from the application roller 2 at this time.

From this point of view, FIG. 2 shows a state in which the application roller 2 is separated from the photoreceptor 1 and the water-repellent material 3 during non-application, and in this case, the operation of the solenoid 12 is stopped. As a result, the holder 15 is pulled by the spring 16 and rotates clockwise about the support shaft 14, and the water repellent material 3
When the holder 15 separates from the application roller 2, the holder 11 is rotated clockwise about the spindle 10,
The result will be as shown in the figure.

In the above embodiment, the solenoid 12 may be replaced by another actuating member having a similar function, and if the solenoid 12 is of a double-acting type, the spring 16 is omitted, and the water repellent material 3 is moved downward by gravity. Although not shown in the drawings, the receiver is preferably provided with a case, a scraper, etc. to prevent it from flowing out.

[Second Example] 3rd. In the embodiment of the apparatus according to claim 2 shown in FIG. It has the same structure as the roller 2 and the water repellent material 3.

The application roller 22 is rotatably supported by a support shaft 25.
The pair of holders 39 and 39' have their central shafts 36 bearing 38
is pivoted to allow rotation and axial movement,
This center shaft 36 has a spring 37 on one side (the left side in the drawing).
is wrapped around the spring, and both ends of this spring are connected to the holder 3.
9 and the coating roller 22, and constantly presses the coating roller 22 to the right in the drawing. A gear 40 is attached to a portion of the central shaft 36 that protrudes from the holder 39'.

The case 23 is attached to a holder 39, 39' in a position adjacent to the applicator roller 22, and such holders 39, 39' are attached by actuating members, not shown.

It swings around a support shaft 25 to bring the coating roller 22 into contact with and away from the photoreceptor 1 .

A swash plate cam 43 provided with a gear 41 that meshes with a gear 40 is attached to the support shaft 25, and a central shaft 36 is attached to this cam surface.
The tips of the two are in contact with each other.

A gear 42 is provided which meshes with the gear 41 and is driven by an actuating member (not shown).

27 is a cleaning means, 28 is a cleaning blade, 29 is a fur brush made of conductive fibers, 3
0 indicates a roller to which a bias is applied when electricity is applied, 31 indicates a scraper for removing toner from the roller 30, and 32 indicates a coil-shaped discharging member for discharging toner to the outside.

In the embodiment described above, when applying the water-repellent material, the holder 39° 39' is moved to the position shown in the third figure by an operating member (not shown), and the application roller 22 is brought into contact with the photoreceptor 1 and the water-repellent material 23. A water repellent material 23 is applied to the surface of the photoreceptor 1 by an application roller 22. Although not shown when the water repellent material is not applied, the holder 39, 39' is attached to the support shaft 25.
The coating roller 22 is moved away from the photoreceptor 1 by swinging clockwise around the center.

When applying the water repellent material 23 as described above, the gear 42 is driven by an actuating member (not shown), and this drives the gear 41, 40.
The swash plate cam 43 and the central shaft 36 are rotated through the swash plate cam 43 and the central shaft 36. As the swash plate cam 43 rotates, the central shaft 36 whose tip is in contact with the cam surface by the pressing force of the spring 37 rotates and reciprocates in the axial direction as shown by the arrow in FIG.
As a result, the application roller 22 also applies the water-repellent material 23 onto the surface of the photoreceptor 1 while moving in the same manner as the central shaft 36 . In this case, it is preferable that the rotational speeds of the coating roller 22 and the photoreceptor 1 are different, and the speed ratio thereof is about 0.5 to 2 (excluding 1). It has been found that good results can be obtained by moving the application roller 22 in an axial direction of about 1 to 5 mm.

Although the applicator roller 22 is illustrated as rotating in the same direction as the photoreceptor 1 in the above case, it may be rotated in the opposite direction. Support shaft 2 to prevent it from escaping from body 1
Select position 5. That is, it is preferable to set the roller 22 at such a position that a moment directed toward the photoreceptor 1 is applied to the roller 22 by the driving force of the gear 41 .

In addition, in order to regulate the amount of water-repellent material applied, the coating roller 22 may not be brought into constant contact with the photoreceptor 1 even when it is rotating, but may be brought into contact with it every certain number of sheets or during non-image formation. To prevent dew condensation from forming on the surface of the photoconductor 1, or to prevent abnormalities such as scattering of the water repellent material and adhesion of the water repellent material to the cleaning blade 28 and other members that are in contact with the photoconductor 1. It is best to adjust the amount of application.

[Effects of the Invention] The apparatus according to claim 1 is as described above, in which the application roller holder and the water-repellent holder are actuated by the operation of the actuating member, and when applying the water-repellent material, the application roller is moved to the photoreceptor. Since the application roller is kept in contact with the photoreceptor and the water-repellent material and is separated from the photoreceptor and the water-repellent material when not being applied, a large amount of the water-repellent material is locally attached to the photoreceptor and the application roller when not being applied. This prevents the adhered water-repellent material from adhering to members that come into contact with the photoreceptor and causing quality deterioration, and also prevents stains on the charger, stains on the optical system, etc. due to the scattered water-repellent material, etc. This has the effect of preventing image deterioration from occurring.

Next, in the apparatus of claim 2, the speeds of the photoreceptor and the application roller are set to be different, and the application roller is installed to move back and forth in the axial direction, so that the water-repellent material is uniformly applied over the entire surface of the photoreceptor. It prevents the occurrence of local uneven coating,
In particular, the highly viscous liquid or semi-solid water repellent material can be rubbed into the photoreceptor in a good manner, making it uniform and in good condition, resulting in the application of an appropriate amount of water repellent material overall. This has the effect that, as with the apparatus of claim 1, inconveniences due to excessive adhesion can be prevented without causing excessive adhesion.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view of an embodiment of the apparatus according to claim 1 during application, FIG. 2 is a similar view of the same as the above when application is not applied, and FIG. FIG. 4 is a partially longitudinal front view of the embodiment during coating, FIG. 4 is a partially longitudinal side view of the same essential parts as above, and FIGS. 5(A) and 5(B) are schematic diagrams of different conventional coating devices, respectively. . 1... Photoreceptor 2, 22... Application roller 3
．． 23... Water repellent material 4, 24... Case 10.
14... Support shaft 11, 15... Holder 12...
Solenoid 16... Spring 25... Support shaft
36... Central shaft 37... Spring 39... Holder 43
... Swash plate cam patent applicant Riko Co., Ltd. 7 帛 1 叉花 2 fig. 31 帛 4 Katori 5 prefecture (B)

Claims (1)

[Claims] 1. In an apparatus for applying a water-repellent material to the surface of a photoreceptor after a cleaning process is completed and before a developing process is started, an application roller is held so as to be able to approach and separate from the surface of the photoreceptor. a water-repellent material holder that holds a water-repellent material on the application roller in a manner that allows it to move toward and away from the application roller; When the coating roller contacts the surface of the photoreceptor, the water-repellent material contacts the coating roller, and when the coating roller separates from the surface of the photoreceptor, the water-repellent material separates from the coating roller. A water-repellent coating device for a photoconductor, characterized in that: 2. In an apparatus that applies a water-repellent material to the surface of a photoconductor after the cleaning process is finished and before the development process starts, the speed of the photoconductor and the speed of the coating roller are different, and the coating roller A water-repellent coating device for a photoreceptor, characterized in that the water-repellent coating device is installed to move back and forth in an axial direction.