Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1980-09-08
1983-02-08
Taylor, Billy S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
29593, 29605, 29618, 242 712, 324 62, H01F 4104, H01C 1722
Patent
active
043724973
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to fine adjustment of radio components and in particular to methods of manufacturing wound items from coaxial microwire and devices therefor.
DESCRIPTION OF THE PRIOR ART
Known in the art is a method of manufacturing wound items representing RC structures from coaxial wire, which essentially consists in alternately unwinding short lengths of wire from the frame of the item being manufactured and measuring parameters of the microwire remaining on said frame. The afore-mentioned operation is performed many times in the case of precision items, a limitation substantially increasing labour requirements in production thereof (cf. "Microwire and Resistance Devices", No. IV, 1969, "Karta Moldovenyaske", Kishinev, I. I. Grishanov, S. N. Dimitraki, Z. I. Zelikovsky "Adjustment of Resistors Made from Insulated Wire", p 250, in Russian). With the foregoing method the adjustment operation accounts for 70 to 80% of the total labour requirements in production of the given item, a factor appreciably reducing the efficiency of labour.
Also known in the art is a method of manufacturing wound items (cf. USSR Inventor's Certificate No. 274, 186, Cl. H01C17/00 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks", No. 21, 1970, in Russian), which essentially consists in winding a specified amount of wire onto the frame of an item being manufactured over a preset length, the resistance of the wire being within 95-98% of the resistance rating for the item. With the aforesaid method the subsequent steps are thermal treatment of the wound wire and measurement of its actual resistance. Thereafter an additional amount of wire is wound on the same frame so as to form an individual winding. The formed windings are then electrically interconnected through a band additionally provided on the frame of the item being manufactured. Such a method of manufacturing wound items calls for the provision of four contacts between the wire and current leads on the frame of the item being manufactured, two of said contacts being connected with the additional band. Increasing the number of wire contacts decreases the reliability of the manufactured item. The foregoing method has been generally unsatisfactory due to the need for individual selection of the adjusting winding for each item, a disadvantage complicating a production procedure, introducing unwanted complexities in soldering wire to a frame band, and, in effect, increasing labour requirements in production of wound items.
The closest prior art reference is a method of manufacturing wound items from coaxial microwire (cf. USSR Inventor's Certificate No. 246,640, Cl. H01C17/00 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks", No. 21, 1969), which essentially consists in unwinding excess microwire from an item being manufactured, which is accompanied by continuous measurements of the electrical parameter of the unwound microwire utilized as an auxiliary item inserted in a measuring circuit, i.e., a bridge along with the item being manufactured. The unwinding operation is stopped at the moment the resistance of the auxiliary item equals the preset resistance of the wire section to be unwound.
While the wire is unwound, a change in the time constant of the item being manufactured due to nonuniformity of the wire linear time constant is accompanied by a variation of the relation between active and reactive components of the time constant of the item being manufactured and the auxiliary item formed by the unwound wire. This variation of the relation between the active and reactive components of the time constant of the manufactured and additional items and continuity of the coaxial sheath of the wire prevent production of like wound items with a practicable accuracy.
Another known device for manufacturing wound items (cf. USSR Inventor's Certificate No. 388,305, Cl. H01C17/00 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks", No. 28, 1973, in Russian) comprises a mechanis
REFERENCES:
patent: 2725199 (1955-11-01), Bower
"Microwire and Resistance Devices", No. IV, 1969, I. I. Grishanov et al.
"Fundamentals of Phase Metering", O. O. Galakhova, et al., Energiya Publishers, Leningrad, 1976, pp. 140-143.
Dimitraki Lolita S.
Dimitraki Sergei N.
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