JPH0328053Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(A) Field of Industrial Application The present invention relates to a core for web winding, and particularly to a core for winding a web by being directly attached to a chucking device. (B) Prior art and its problems Supports used in the production of photographic materials, and photographic materials obtained by coating and drying a photosensitive layer such as a silver halide emulsion on this support, are core materials in the manufacturing process. It is wound up. Usually, these cores are composed of a cylindrical body 2 and a cap part 3, as shown in FIGS. 2 and 3.
is made of metal such as iron by press working. The base portion 3 is provided with a chuck insertion hole 4 into which a chuck 11 of a chucking device 10 can be inserted, and each of these holes is provided with a key 12 and a keyway 5 for fixing the core 1. When winding the web onto the core, the chuck 11 of the chucking device 10 is inserted into the chuck insertion hole 4 of the mouthpiece 3 of the core 1 and installed, but since the chucking device is made of metal such as iron, When the web is attached to a chucking device and when the web is wound up after the attachment, fine metal powder is generated due to impact, pressure, friction, etc. between the two, which adheres to the web and causes various adverse effects. In the case of silver halide photographic materials, these dusts cause the occurrence of speckled fog and a decrease in photographic sensitivity, resulting in a fatal defect in terms of quality. As a method of preventing the generation of these metal powders, it was discovered that it is effective to form at least the contact part of the core with the chucking device, that is, part or all of the mouth part, from plastic (1981). (March 7, 2016) The name of the proposed device, ``Web Winding Core,'' was changed after further study.By forming the cylindrical body part also from plastic, paper dust caused by conventional multi-laminated paper was generated. In addition to discovering that it is possible to prevent dust from occurring within the core, we also investigated the structure of the core and succeeded in obtaining a web winding core that comprehensively prevents the generation of various types of dust and does not allow dust to accumulate within the core. (C) Purpose of the invention As mentioned above, the purpose of the invention is to prevent the generation of metal powder and paper dust that conventional cores have, and to create a chucking device that has comprehensive dust countermeasures that prevent dust from accumulating in the core. To provide a web winding core that is used by being directly attached. (D) Structure of the device At both ends of the outer cylinder 21, the inner cylinder 22 has a base part 3 with a chuck insertion hole 4 and a key groove 5 facing the chuck insertion hole 4, and an inner cylinder 22 whose inner diameter is the same as that of the chuck insertion hole 4. Combined to form a multi-cylindrical structure, the outer cylinder 21 and the inner cylinder 2
2. This has been achieved by providing a core for winding a photographic material that is used by being directly attached to a chucking device, which is characterized in that the cap part 3 is made of plastic and the Rockwell hardness of the cap part 3 is 80 or more. Plastics used in this invention include nylon, polyacetal, polypropylene, polyethylene, polycarbonate, fluorine resin, and ABS.
Examples include, but are not limited to, resins, vinyl chloride resins, phenolic resins, epoxy resins, and those blended with fibers (including glass fibers). (E) Embodiments Next, embodiments of the present invention will be described based on the drawings. FIG. 1 is a schematic cross-sectional view showing one example of the web winding core of the present invention, with FIG. A showing a front cross section and FIG. B a side cross section. The cylindrical main body 2 has a multi-cylindrical structure composed of an outer cylinder 21 and an inner cylinder 22. in this case,
The outer tube 21 and the inner tube 22 may be made of the same plastic or different plastics. As for the type of plastic, fiber-reinforced plastic is preferable because it can sufficiently withstand high speeds and large loads during web winding, and glass fiber-reinforced plastic is particularly preferable. Examples of these include FRP (glass fiber reinforced epoxy resin) manufactured by Asahi Glass Co., Ltd. The thickness of the outer cylinder 21 and the inner cylinder 22 depends on the type of plastic, but is generally selected in the range of 2 to 15 mm, preferably 3 to 9 mm. The outer cylinder 21 and the inner cylinder 22 are connected to the base part 3 and the coupling member 6.
The outer cylinder 21 and the inner cylinder 22 are connected to each other via a hollow space. It is preferable that the inner diameter of the inner tube 22 is the same as the chuck insertion hole 4 so that it is continuous with no step difference. In this case, if there is no inner cylinder 22, the area between the base parts 3 at both ends of the core, that is, the cylindrical part main body 2
This is undesirable because a large dent will be formed inside the holder, and dust generated in some form due to long-term use will accumulate in this dent. The plastic used for the mouthpiece 3 may be the same as that for the cylindrical body 2, but it is preferable to select a material that is less prone to wear due to contact with the chuck 11 for the part that comes into contact with the chucking device 10 when attached to the chuck 10. preferable. The mechanical strength against wear can be determined by referring to hardness, tensile strength, elongation, elastic modulus, etc., and the "desirable range" and "more desirable range" listed in Table 1 can be used as a guide. Table 2 shows typical examples. The coupling member 6 is not particularly limited, but may be made of plastic or metal such as stainless steel. These outer cylinder 21, inner cylinder 22, and base part 3 are connected with adhesive and/or without using the connecting member 6.
Alternatively, it can be coupled by a port.

【table】

[Table] In Table 2 above, MC stands for MC nylon, PA stands for polyacetal, and PP stands for polypropylene. (F) Effects of the invention According to the invention, it prevents the generation of metal powder and paper powder that conventional cores have, and also has a structure that prevents dust from accumulating in the core, which reduces the overall impact of dust. I was able to eliminate the disadvantage. In addition, by making the cylindrical body of the core have a multi-cylindrical structure, in addition to the above effects, it is lighter in weight than a single cylinder structure and has higher strength against high-speed and heavy-load rotation during web winding, improving handling and durability. Excellent.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one example of the present invention, and A
The figure is a front cross section, and the figure B is a side cross section. FIG. 2 is a perspective view showing an example of a conventional web winding core, and FIG. 3 is a schematic sectional view showing a state in which the core is inserted into a chucking device of a web winding device. DESCRIPTION OF SYMBOLS 1...Core, 2...Cylindrical part main body, 3...Best part, 4...Chuck insertion hole, 5...Keyway, 6...
...Connecting member, 10... Chucking device, 11...
...chuck, 12 ... key, 13 ... chuck joint, 21 ... outer cylinder, 22 ... inner cylinder.

Claims (1)

[Scope of utility model registration request] Both ends of the outer cylinder 21 are connected to the mouthpiece 3, which has a chuck insertion hole 4 and a keyway 5 facing the chuck insertion hole 4, and the inner cylinder 22, which has the same inner diameter as the chuck insertion hole 4, to form a multi-cylindrical structure. , outer cylinder 21, inner cylinder 2
2. A core for winding a photographic material, which is used by being directly attached to a chucking device, characterized in that the mouthpiece 3 is made of plastic, and the Rockwell hardness of the mouthpiece 3 is 80 or more.