JP2001208206A - Powder seal piece of rotation shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exquisitely enhance seal function by forming a projection or a groove in the length direction of the surface where becomes the inner surface of a powder seal piece so as not to disturb rotation by penetration of powder attached to the circumferential surface of a rotation axis of a toner cartridge or the like into a bearing part. SOLUTION: A powder seal piece A is constituted in such a way that a holder 9 of elastic foamed plastic is used in the center, a Teflon (R) felt piece 8 is fixed to the surface on the holder 9 so as not to easily peel off, and one side of a pressure adhesive double coated tape is fixed to the back surface to form a three layer stack, the three layer stack is formed in a U-, C-, or J-shape corresponding to the shape of a recess so as not produce wrinkles on the surface where becomes the inner surface of the recess of the Teflon (R) felt piece 8, and the projection or the groove is formed in the length direction on the surface of the Teflon (R) felt piece 8 of the powder seal piece A, or the surfaced where becomes the inner surface when fixed to the recess, and the projection or the groove is inclined if necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The inside of a bearing unit (eg, such as a copier, a facsimile, a printer, etc.) is used to prevent powder adhering to the peripheral surface of a rotating shaft of a toner cartridge or the like from entering a bearing unit and hindering rotation. The present invention relates to a powder seal piece which is attached to the left and right side plates of the toner tank and seals the intrusion of powder, and has a significantly improved sealing function of the powder seal piece.

[0002]

2. Description of the Related Art At present, in a copier, a facsimile, a printer, and the like, a magnet roller, a rectangular box-like case filled with toner (eg, carbon fine powder), and the like are used.
Although a toner cartridge or the like in which a rotation shaft such as a transfer roller is set is widely used, the powder 2 adhering to the peripheral surface of the rotation shaft 1 is mixed into the bearing portion 3 due to long-term use, so that rotation is hindered. Ordinarily, a seal portion 5 for sealing the powder 2 is provided inside the bearing portion 3 (for example, the left and right side plates 4 of the toner tank) so that the powder does not leak out from the seal portion 5 to the bearing portion 3 side. I try not to. (See FIGS. 6 and 7)

The seal portion 5 forms a U-shaped concave portion 5a for fitting the rotary shaft 1 from the front side or the top side of the toner case or the like, and powder leakage is formed on the inner peripheral surface of the concave portion 5a. The powder seal pieces a to be sealed are integrally bonded.

[0004] Usually, the powder seal piece a has elasticity and extremely low frictional resistance, is excellent in durability, and the fibers entangled with high density effectively act to effectively prevent intrusion of fine powder. Uses Teflon felt which has excellent characteristics of Teflon felt. However, this Teflon felt is extremely expensive as it is said to be 10,000 yen in a 10,000-yen bill size. It is customary to use it in combination with a material. Although it differs slightly depending on the manufacturer, for example, a foamed plastic piece on the back of a Teflon felt piece with a width of about 5 mm, a length of about 50 mm, and a thickness of about 1 to 5 mm, a normal felt The powder seal piece is formed by laminating a holder made of a piece, a rubber piece, or the like so as not to be easily peeled off, and bonding one surface of a double-sided adhesive film 7 (bonding a release paper 7 'to the other surface) to the back surface thereof. a The other surface of the double-sided adhesive film 7 (by peeling off the release paper 7 ′) is fixedly attached to the inner peripheral surface of the concave portion 5 a of the seal portion 5.

Conventionally, the work of attaching the powder seal pieces a has been performed manually in the manufacturing process of the toner cartridge and in the field of maintenance and repair of the product.
The solution of that inefficiency has been a challenge. Further, the release paper 7 'of the double-sided adhesive tape 7 of the flat powder seal piece a is peeled off and adhered to the inner peripheral surface of the concave portion 5a. At this time, the powder seal piece a is rotated to prevent powder leakage. The powder seal piece a is pressed against and adhered to the inner peripheral surface of the concave portion 5a with the fingertip of the operator so that the powder seal member a can be well fitted and adhered to the peripheral surface of the shaft 1. However, wrinkles 10 are inevitably formed on the inner surface side of the powder seal piece a, so that the powder seal piece a becomes uneven, and even if it is handled with a fingertip, it is not easy to smooth, and there are many variations depending on the skill level. There were challenges. (See (a) and (b) in FIG. 5)

Accordingly, the applicant has filed Japanese Patent Application No. 03-358530 (Japanese Patent Application Laid-Open No. 05-181354).
No.), the name “Rotary shaft powder seal piece”, and Japanese Patent Application No. Hei 11
The above-mentioned conventional problem is solved by Japanese Patent No. 168099, entitled "Method of Manufacturing Powder Seal Piece of Rotating Shaft". That is, the conventional one, as described above,
It is extremely inefficient because the flat, small and difficult-to-handle powder seal pieces are glued and attached so that they can be bent into a U-shape by the operation of a fingertip. In addition, wrinkles are inevitably formed on the inner surface. Paying attention to the fact that the toner leaked out therefrom and the sealing performance was poor, and the finish varied widely,
Shape, C shape, J shape, etc., in a circular or semi-circular and resilient state, the inner surface side of the powder seal piece is also formed in advance on a smooth surface without wrinkles, and the powder seal piece is sealed. Insert it while slightly shrinking it into the recess of the part, press it against the inner surface of the recess with its elastic restoring force and fix it quickly.
This is an effective solution of the above-mentioned conventional problem by ensuring that the components can be securely and evenly mounted.

[0007]

An object of the present invention is to solve the problem of further improving the sealing performance by further improving the powder seal piece developed by the applicant of the present invention which has solved the conventional problems as described above. In particular, the operation and effect are significantly improved.

[0008]

Means for Solving the Problems The present invention relates to a strip-shaped member having a size corresponding to the width and length of a powder seal piece used to seal powder leakage by being fixed to the inner surface of a bearing recess such as a toner case. Mainly on a holder made of elastic foam plastic, rubber, felt, etc., fix the Teflon felt piece to the surface so that it will not easily peel off,
One of the three-sided adhesive tape having one side adhered to the back surface and a release paper adhered to the other side of the double-sided adhesive tape is formed into a U-shaped, C-shaped, J-shaped or the like suitable for the shape of the concave portion. In the shape of the surface of the Teflon felt piece, that is, in a state where there is no wrinkle on the surface serving as the inner surface of the bearing recess, in a powder seal piece which is formed and provided in advance,

[0009] A protrusion or groove is formed in the longitudinal direction of the surface of the Teflon felt piece of the powder seal piece, that is, the surface which becomes the inner surface when fixed to the bearing recess.
The problem was effectively solved by the powder seal piece of the rotating shaft.

[0010]

Means for Solving the Problems The present invention is directed to a strip having a size corresponding to the width and length of a powder seal piece which is fixed to an inner surface of a bearing recess such as a toner case and used to seal leakage of powder. Mainly on a holder made of elastic foam plastic, rubber, felt, etc., fix the Teflon felt piece to the surface so that it will not easily peel off,
One of the three-sided adhesive tape having one side adhered to the back surface and a release paper adhered to the other side of the double-sided adhesive tape is formed into a U-shaped, C-shaped, J-shaped or the like suitable for the shape of the concave portion. In the shape of the surface of the Teflon felt piece, that is, in a state where there is no wrinkle on the surface serving as the inner surface of the bearing recess, in a powder seal piece which is formed and provided in advance,

[0011] A convex or groove is formed in the longitudinal direction of the surface of the Teflon felt piece of the powder seal piece, that is, a surface which becomes an inner surface when fixed to the bearing recess, and the convex or groove is provided to be inclined. The problem is effectively solved by a powder seal piece of a rotating shaft characterized by the following.

[0012]

Means for Solving the Problems The present invention relates to a U-shaped cross section and a C-shaped cross section formed by polymerizing a rectangular Teflon felt sheet and a holder sheet such as a rectangular foamed plastic sheet having one side adhered to one side of a double-sided adhesive film. , J type, etc., set in a press mold consisting of a male mold and a female mold having a shape corresponding to the shape of the bearing concave part of the toner case etc., and heat and press. In the method for producing a powder seal piece, a powder seal piece raw material such as a shape and a J shape is provided, and the raw material is cut into a set width and shape to provide the powder seal piece.

[0013] The male mold of the press molding die is provided with a concave or convex ridge for press-forming a convex ridge or groove on the surface of the Teflon felt sheet, and is formed by the molding die. By providing a material having a protruding line or groove formed on the surface of the Teflon felt sheet of the raw material, cutting the raw material into a set width and shape, and manufacturing a powder seal piece by providing a powder seal piece, It is a solution to the problem.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rectangular Teflon felt sheet 8a and a double-sided adhesive film 7a on one side (a release paper is adhered on the other side)
The holder sheet 9a such as a rectangular foamed plastic sheet having one side adhered is superposed, and the cross section is U-shaped, C-shaped, J-shaped.
Set in a press-molding mold consisting of a male and female mold having a shape corresponding to the shape of the concave portion 5a of the seal portion 5 such as a toner case, and heated and pressurized.
A powder seal piece raw material B such as a C type or a J type is provided, and the raw material B is cut into a set width and shape, and a powder seal piece A is provided.

Dimensions corresponding to the width and length of the powder seal piece A, that is, the powder seal piece A that is fixed to the inner surface of the concave portion 5a of the seal portion 5 such as a toner case and used to seal leakage of powder. A three-layered structure in which a Teflon felt piece 8 is fixed to a surface of a holder 9 made of a resilient foamed plastic or the like so as not to be easily peeled off, and one surface of a double-sided adhesive tape 7 is fixed to the back surface. Stuff
U-shape, C-shape, J-shape or the like that matches the shape of the concave portion 5a, which is formed in advance by forming the surface of the Teflon felt piece 8, that is, the surface serving as the inner surface of the concave portion 5a without wrinkles. Powder seal piece A, wherein the powder seal piece A
The surface of the Teflon felt piece 8, that is, the ridge or groove 1 in the longitudinal direction of the surface which becomes the inner surface when fixed to the recess 5 a.
1 and a rotary shaft powder seal piece A provided with the ridges or grooves 11 as required.
It is. (See FIGS. 1 to 4)

[0016]

In the concave portion 5a of the seal portion 5 such as a toner case,
Peel off the release paper 7 ′ of the double-sided adhesive tape 7 on the back surface, insert the powder seal piece A while slightly squeezing it, and press the finger seal against the inner peripheral surface of the concave portion 5 a with the other surface of the double-sided adhesive tape 7. The rotating shaft 1 is fitted and mounted on the powder seal piece A, and the wrinkle-free inner peripheral surface of the seal piece a elastically adheres to the outer peripheral surface of the rotary shaft 1 by the elasticity of the foamed plastic or the like. Thus, leakage of the powder is effectively prevented.

[0017]

[Effect] Since the rotating shaft rotates in contact with the upper surface of the protruding ridge of the powder seal piece or the upper surface of the crest between the grooves, the rotating shaft can be rotated lightly with less rotational friction resistance than in the case of rotating in contact with the entire surface.

The powder gradually entering between the rotating shaft and the Teflon felt of the powder seal piece is temporarily stored in the ridges or grooves between the ridges, so that the powder is prevented from intruding beyond the ridges or grooves. Is performed in several stages (eg, 4 to
(Sixth step), which has an excellent effect of extremely effectively preventing the intrusion of powder.

When the ridges or grooves are formed to be inclined, the ridges or grooves are helical ridges or grooves, that is, screw conveyors, in relation to the contact outer peripheral surface of the rotating shaft fitted and installed therein. Therefore, there is a feature that the intrusion of the powder can be more effectively prevented by performing an operation of returning the intruding powder in the reverse direction by the action of a screw conveyor accompanying the rotation of the rotating shaft.

[Brief description of the drawings]

FIG. 1 is a front view, a plan view, and a right side view of an embodiment of a powder seal piece of the present invention.

FIG. 2 is an enlarged plan view of FIG.

FIG. 3 is an enlarged sectional view taken along line CC of FIG. 1;

FIG. 4 is a front view, a plan view, and a right side view of a raw material of a powder seal piece according to an embodiment of the present invention.

FIG. 5 is an explanatory view of attaching a conventional powder seal piece to a seal portion. In FIG.
The figure which shows the state which wrinkled when it attached in (b).

FIG. 6 is a view showing a state in which a rotating shaft is inserted and installed in FIG. 5 and rotated, so that powder leaks from wrinkles.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

[Explanation of symbols]

 A Example of the present invention Powder seal piece a Conventional powder seal piece B Raw material of powder seal piece 1 Rotating shaft 2 Powder 3 Bearing 4 Side plate 5 Seal 5a Depression 6 Convex or groove 7 Double-sided adhesive tape 7 'Release paper 8 piece of Teflon felt 8a Teflon felt sheet 9 Holder 9a Holder sheet 10 Wrinkles

Claims (3)

[Claims] 1. A strip-shaped and resilient foam plastic which is fixed to an inner surface of a bearing recess of a toner case or the like and seals leakage of powder to be used for sealing powder leakage. With a holder made of rubber or felt as the center, a piece of Teflon felt is fixed on the surface of the holder so that it is not easily peeled off, one surface of the double-sided adhesive tape is fixed on the back surface, and a release paper is coated on the other surface of the double-sided adhesive tape. The laminated structure of the three members adhered is in a U-shaped, C-shaped, J-shaped or the like shape corresponding to the shape of the concave portion, and has no wrinkles on the surface of the Teflon felt piece, that is, the surface serving as the inner surface of the bearing concave portion. In the powder seal piece which is formed and formed in advance, the surface of the Teflon felt piece of the powder seal piece, that is, the inner surface of the powder seal piece when it is fixed to the bearing concave portion, has a convex stripe in the longitudinal direction. Or a powder seal piece of a rotating shaft, characterized in that a groove is formed. 2. A strip-shaped and resilient foamed plastic having a size corresponding to the width and length of a powder seal piece used to seal leakage of powder by being fixed to an inner surface of a bearing recess such as a toner case. With a holder made of rubber or felt as the center, a piece of Teflon felt is fixed on the surface of the holder so that it is not easily peeled off, one surface of the double-sided adhesive tape is fixed on the back surface, and a release paper is coated on the other surface of the double-sided adhesive tape. The laminated structure of the three members adhered is in a U-shaped, C-shaped, J-shaped or the like shape corresponding to the shape of the concave portion, and has no wrinkles on the surface of the Teflon felt piece, that is, the surface serving as the inner surface of the bearing concave portion. In the powder seal piece which is formed and formed in advance, the surface of the Teflon felt piece of the powder seal piece, that is, the inner surface of the powder seal piece when it is fixed to the bearing concave portion, has a convex stripe in the longitudinal direction. A powder seal piece for a rotating shaft, wherein a groove is formed and the ridge or groove is provided at an angle. 3. A polymerized rectangular Teflon felt sheet and a holder sheet made of a rectangular foamed plastic sheet or the like having one side adhered to one side of a double-sided adhesive film,
U-shaped, C-shaped, J-shaped, etc., set in a press-molding die consisting of a male and female mold that matches the shape of the bearing recess of the toner case etc. In a method of manufacturing a powder seal piece, a powder seal piece raw material having a shape of U, C, or J is provided, and the raw material is cut into a set width and shape to provide a powder seal piece. The male mold of the press molding die is provided with concave or convex ridges for press-forming ridges or grooves on the surface of the Teflon felt sheet on the surface thereof. A method for producing a powder seal piece, comprising: providing a Teflon felt sheet surface with ridges or grooves formed thereon, cutting the raw material into a set width and shape, and providing a powder seal piece.