Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Patent
1993-06-25
1995-02-28
McCamish, Marion E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
522 83, C08F 246
Patent
active
053938020
DESCRIPTION:
BRIEF SUMMARY
RELEVANT TECHNICAL FIELD
This invention relates to an ultraviolet curing weight for adjusting the balance of a rotating body, which is capable of adjusting the dynamic balance of the rotating body, on rotating, such as a motor and a polygon mirror.
BACKGROUND OF THE ART
As a weight for adjusting the balance of a rotating body such as a rotor in a motor of a brushless outer-rotor type or a brush motor and a polygon mirror for use in a laser printer, there have been used adhesives of epoxy resin singly or combined with powder having large specific gravity such as metal powder.
Furthermore, the adhesives obtained by adding glass having large specific gravity such as lead oxide, titanium oxide and barium oxide to the ultraviolet curing resin have been allowed for. These adhesives (weight means) have been used in such a manner that they are filled in a part of the rotating body and hardened in order to adjust the balance of the rotating body.
However, in the case of using the singly composed adhesive as a weight, the quantity of the adhesive to be applied becomes increased because the adhesive alone is as small as about 1 in specific gravity. Thus, there cannot be secured room for accommodating the designated amount of adhesive in a small-sized motor, and consequently, sufficient adjustment of the balance of the rotor in the motor cannot be fulfilled.
The adhesive obtained by adding powder having large specific gravity to epoxy resin has also suffered a disadvantage such that the number of processes for producing the adhesive of two-fluid mixing type is increased because a mixing process is necessary therefor, and there is a possibility that the specific gravity of the adhesive is reduced due to air bubbles being possibly merged into the adhesive in the heating process.
The adhesive of single-fluid type requires a heating process in production, and therefore, is unfavorable for mass-production. When an article to be supplied with the adhesive has plastic component parts, disadvantageously, it must be kept away from heat brought about in the heating process for hardening the adhesive.
In order to eliminate the aforementioned drawbacks, it has been attempted to add lead oxide, titanium oxide, barium oxide or the like to an adhesive resin which is hardened by active-energy rays. However, ultraviolet curing resin alone has been generally used as a weight. Thus, such a resin adhesive is likely to become thinner on hardening and takes much time to be hardened. Moreover, the resin adhesive entailed a disadvantage such that unhardened part of the adhesive applied to an object still remains to unbalance the object, and adjustment of the balance of the object becomes insufficient.
DESCRIPTION OF THE INVENTION
To solve the problems as mentioned above, the present invention provides a weight for adjusting the balance of a rotating body, which is obtained by adding and mixing one or two or more sorts of solid spherical powders selected from silicated glass, boro-silicated glass and phosphate glass to and with ultraviolet curing resin.
To the weight composition which is obtained by adding and mixing one or two or more sorts of solid spherical powders selected from silicated glass, boro-silicated glass and phosphate glass to and with ultraviolet curing resin, there may be added one or two or more sorts of solid spherical powders selected from glass of TiO.sub.2 --BaO--SiO.sub.2 group, glass of BaO--ZnO--SiO.sub.2 group and lead glass.
The ultraviolet curing resin used in this invention may include a polymerization initiator, a polymerization inhibitor, gum, elastomers, a silane coupling agent and/or a filler as occasion demands, other than polymeric oligomers and monomers polymerizable with ultraviolet rays.
As the polymeric oligomer as noted above, there may be used a compound having at least one ethylene double bond structure capable of polymerizing. To put it concretely, there can be enumerated (meta) acrylates such as polyurethane (meta) acrylate, epoxy (meta) acrylate, polyester (meta) acrylate, and compounds dena
REFERENCES:
patent: 4309334 (1982-01-01), Valitsky
patent: 4425287 (1984-01-01), Hesse
patent: 4923905 (1990-05-01), Masuhara
patent: 5013768 (1991-05-01), Kiriyama
Patent Abstracts of Japan, vol. 012141, (M691), Apr. 28, 1988, JP-A-62 261 733, Nov. 13, 1987.
Chapman Mark A.
McCamish Marion E.
Three Bond Co. Ltd.
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