JPH03109587A - Developing device - Google Patents

Abstract

PURPOSE:To securely seal the contact part of a doctor roller and a developing roller by forming a seal member with a bristle-planted seal and forming the bristles with different materials. CONSTITUTION:The bristle-planted seal 12 sealing both end parts of the developing roller 2 and doctor roller 3 is formed with different materials. In other words, in the seal 12 from a part abutting on the developing roller 2 to the part abutting on the doctor roller 3, different types of bristles fitting to each part of the seal 12 are used. Thus, undue load is not applied to the developing roller 2, but the contact part 0 of the doctor roller 3 and the developing roller 2 is sufficiently sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a developing device in an image forming apparatus such as a printer, an electronic copying machine, or a facsimile machine.

(Prior Art) Conventionally, a developing device employed in an image forming device such as a printer, an electronic copying machine, or a facsimile machine includes a developing container disposed facing a photoconductor on which an electrostatic latent image is formed; It is composed of a developer supply roller such as a developing roller placed inside this developer container.

An example of such a developing device will be explained based on FIG. 5. A developer container 5 having an opening facing the photoreceptor drum 1
A developing roller 2 that supplies developer to the electrostatic latent image on the surface of the photoreceptor drum 1 is rotatably supported within the developing container 5. rotates in the same direction as the developing roller 2 while in contact with the developing roller 2, and a doctor roller 3 that regulates the amount of developer on the surface of the developing roller 2 is in contact with the developing roller 2. The tip of a scraper 4 is brought into contact with the circumferential surface of the doctor roller 3 in order to scrape off the developer that has migrated to the circumferential surface. Reference numeral 6 indicates a cleaning roller, 7 indicates a replenishment roller, 8 indicates an agitator, and 9 indicates a toner feeder.

The manner of sealing at both ends of the developing roller 2 and the doctor roller 3 in this developing device will be described with reference to the drawings for explaining the present invention in detail. Both ends 2 of 3
A, 3a are sealed with a support substrate 11 protruding inwardly from the side plate 5a of the developer container 5 with a flocked seal 12 to prevent the developer from leaking. This flocked seal 12 is
It is formed of one type of flocked hair, and the length of the bristles is at least long enough to reach the contact point ◯ between the doctor roller 3 and the developing roller 2, that is, the length of the dimension A.

Reference numeral 4a indicates at both ends 3a of the doctor roller 3,
A sealing member formed of felt that seals between the side plate 5a of the developer container 5 and the scraper 4 is shown.

(Problems to be Solved by the Invention) In this conventional developing device, the flocking of the flocking seal 12 needs to be formed so as to seal the contact portion 0 between the doctor roller 3 and the developing roller 2. For this purpose, it is necessary to use fairly hard flocked hair. However, when using hard flocked hair, the developing roller 2
The pressure of the flocked hair increases in the area where it comes into contact with the circumferential surface of the developing roller 2, and the frictional force due to the flocked hair that comes into contact with the circumferential surface of the developing roller 2 increases, generating frictional heat, which may lead to breakage of the end of the developing roller 2. There is. On the other hand, if a flock with a small contact force that contacts the circumferential surface of the developing roller 2, that is, a soft flock is used, there is a problem that the contact portion O between the developing roller 2 and the doctor roller 3 cannot be sufficiently sealed. There is a point.

(Means for Solving the Problems) The present invention has been made to solve the above-mentioned conventional problems, and includes a flocked seal that seals both ends of a developing roller and a doctor roller by forming a flocked seal with a plurality of types of flocked flocks. This is what I did.

(Function) Since the flocked seal part from the part where the developing roller contacts to the part where the doctor roller contacts, the flocked material of the material suitable for each location is used, so there is no need to put an unnecessary load on the developing roller. The contact area between the doctor roller and the developing roller is sufficiently sealed.

(Example) The present invention will be explained in detail below.

In FIGS. 1 and 2, the same reference numerals are used for the same members as in the conventional developing device, and the explanation thereof will be omitted.

As shown in FIG. 3, a flocked seal woven with flocks of different materials is pasted on the surface of the support substrate 11 having an arcuate surface integrally extending inside the side plate 5a. That is, from the side of the doctor roller 3 of the support substrate 11 through the contact portion of the doctor roller 3 and the developing roller 2.

A flocked seal 14 woven with flocked hair 14a of Toyoflon (trade name of a fluorocarbon resin product manufactured by Toshi) shown in FIG. 3 is attached to a portion S extending over the circumferential surface of the developing roller 2. As shown in FIG. Next, on the surface of the support substrate 11, a flocked seal 15 incorporating Teflon flocked 15a shown in FIG. Can be attached. code 1
Reference numeral 6 indicates a double-sided tape used to attach the flocked seal to the surface of the support substrate 11, and reference numeral 17 indicates the portion to be treated. Among the above hair transplants, Toyoflon is harder than Teflon.

The part of the surface of the support substrate 11 that is in contact with the circumferential surface of the developing roller 2 is covered with a flocked sheet 1 in which soft flocked fibers are woven.
4, on the surface of the support substrate 11, a flocked seal 15 incorporating hard flocked fibers is attached to a portion S extending from the circumferential surface of the developing roller 2 to the circumferential surface of the doctor roller 3. No frictional force is generated on the surface of the roller 2, and the contact portion 0 between the developing roller 2 and the doctor roller 3 is sufficiently sealed.

In addition, as a flocked seal, as shown in Fig. 4, one half of a piece of base fabric 28 is woven with Toyoflon flocking 24, and the other half is woven with Teflon flocking 25. may be used.

In this case, of the flocked seal, a flocked seal part with Toyoflon flocked is attached to the S part, and a flocked seal part with Teflon flocked is attached to the T part. Reference numeral 26 indicates a double-sided tape used for pasting the flocked seal on the substrate, and 27 indicates a portion to be treated with tweezers.

By using a flocked sticker in which different types of flocked hair are woven into this base fabric, compared to when two flocked stickers shown in Fig. 3 are pasted side by side and used.
Since no tweezing treatment part is formed between the hard flocked seal and the soft flocked seal, the generation of a gap is prevented. In addition to Teflon and Toyoflon, materials such as polypropylene, nylon, rayon, and Tetron may be used as the material for the flocking of the flocking seal. In this case, the harder order is Tetoron.

The order is rayon, nylon, polypropylene, Toyoflon, and Teflon. As the above-mentioned flock, these materials may be selected and used as appropriate.

In this way, when using one type of flocked seal, and when using two types of flocking stickers,
As shown in Figure 6, when using two types of flocked seals, the surface temperature of the developing roller 2 is approximately 10°C higher than when two types of flocked seals are used. Can be lowered.

In the above embodiment, an example was shown in which a flocked seal using two types of flocked hair as appropriate was used, but in the present invention, a flocked seal may be made by using three or more types of flocked hair with different hardnesses.

Further, in the above embodiment, a harder flocked seal is used on the circumferential side of the doctor roller, and a softer flocked seal is used on the developing roller side, but the present invention is not limited to this. If the doctor roller is made of a relatively soft material and the developing roller is made of a hard material, place a soft flocked seal on the doctor roller side.
A hard flocked seal is used on the developing roller side.

(Effects of the Invention) According to the present invention, in the flocked seal part from the part where the developing roller contacts to the part where the doctor roller contacts,
Since the flocked material is used in a material that is suitable for each location, there is no need to place an excessive load on the developing roller, the contact area between the doctor roller and the developing roller can be sufficiently sealed, and the edge of the developing roller It is possible to eliminate the risk of causing damage to the parts.

[Brief explanation of drawings]

FIG. 1 is a partial front view of a developing device showing an embodiment of the present invention, FIG. 2 is a perspective view of the same, and FIG. 3 is a partial front view of the developing device. FIG. 4 is a developed view showing an example of the flocked seal of the present invention, FIG. 4 is a developed view showing another example of the flocked seal, FIG. 5 is a vertical cross-sectional view of a conventional developing device, and FIG. It is a graph showing changes in the surface temperature of the developing roller when a flocked seal and two types of flocked seals are used. 2...Developing roller, 3...Doctor roller, 5...Developing container, 12...Seal member, 14°15°8...Flocking seal. place? ■ Ink■ Treatment

Claims (1)

[Scope of Claims] A developing container having an opening facing the photoreceptor; a developing roller rotatably supported within the developing container; and a developing roller rotating in contact with the circumferential surface of the developing roller. A developing device comprising: a regulating member that regulates a developer layer formed on a surface; and a sealing member that is provided on the developer container and seals a gap between the developer roller and both ends of the regulating member and the developer container. The developing device according to the present invention, wherein the seal member is formed of a flocked seal, and the flocked seals of the flocked seal are made of a plurality of types of materials.