Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1980-09-08
1982-10-05
Taylor, Billy S.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 703, 324 62, H01C 1700, H01C 1722, H01F 4104
Patent
active
043524656
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to production of precision radio components and in particular to devices for manufacturing resistors from insulated wire.
DESCRIPTION OF THE PRIOR ART
Known in the art is a device utilized at a final stage of manufacturing resistors from microwire, when a wound resistor is adjusted to comply with the rating (cf. USSR Inventor's Certificate No. 246,639, Cl. H21C 54/01 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks", No. 21, 1969, in Russian).
The aforesaid device comprises a unit for measuring resistance of a resistor being adjusted and a mechanism for breaking glass insulation of wire, which represents a cone roller on a support plate, said roller being kinematically coupled to a drive controlled by the unit for measuring resistance of a resistor being adjusted.
The application of the foregoing device is generally limited; a disadvantage associated with the fact that it is impossible to provide a stable electrical contact between a damaged microwire and such electrically conductive parts as a support plate and a roller, and also between said wire and the resistance measuring unit over a wide range of microwire resistance ratings since insulation splinters damage the wire conductor. A stable electrical contact may be provided only for microwires having a linear resistance not in excess of 2 kilohms per meter.
Furthermore, stringent requirements are placed upon surface roughness of a support plate and a roller in production and service. The surfaces of said parts are readily contaminated with splinters of broken insulation, and an oxide film appears thereon, a feature degrading further the performance of the device.
Also known in the art is a device for executing a method of adjusting wire-wound resistors (cf. USSR Inventor's Certificate No. 246,640, Cl. H21C 54/01 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks," No. 21, 1969, in Russian).
The device for executing the known method of production of resistors, more particularly resistance adjustment for compliance with the rating, involves no destruction of insulation of excess wire unwound from the resistor being manufactured. In the circuit of the device the resistor being adjusted and the resistance of wound wire form arms of a measuring bridge circuit wherein the other two arms are formed by resistance boxes, namely by a resistance box mounting a reference resistor whose resistance is equal to the resistance rating for the resistor being manufactured, and by a resistance box having resistance equal to resistance of a length of wire unwound from the resistor being adjusted. Such a circuit also contains an a-c voltage source connected at opposite junctions of the measuring bridge circuit, and a null indicator.
However, the foregoing device does not permit high-accuracy production of resistors whose resistance rating exceeds 10 megohms, a disadvantage associated with the fact that the resistor being manufactured is inserted in the measuring circuit and pertinent measurements involve the use of a-c voltage. The reactive component of the resistor and the unwound length of wire increases with the resistance rating and may not, therefore, be accounted for in measurements.
Moreover, the operational efficiency of the device is reduced due to the need for having two measurements with alternating and direct currents.
The closest prior art reference is a device for automatic monitoring of wire-wound coils during a winding process without damage to insulation (cf. USSR Inventor's Certificate No. 255,412, Cl. H01 54/01 published in "Bulletin of Inventions, Industrial Standards, and Trade Marks", No. 33, 1969, in Russian).
The aforesaid device comprises a mechanism for taking up wire unwound from a feed spool and a mechanism for securing the feed spool with the wire, said mechanisms incorporating electric contact elements, current output and input electrodes providing capacitive coupling between insulated wire and the circuit, a harmonic generator coupled to
REFERENCES:
patent: 2725199 (1955-11-01), Bower
"Periodic Comparison Measuring Instruments", P. P. Ornatski et al., Energiya, Moscow, 1975, see pp. 31-32.
Dimitraki Sergei N.
Grechanliisky Stepan S.
Grishanov Ivan I.
Miroshnichenko Vladimir S.
Nastas Vitaly I.
LandOfFree
Device for manufacturing resistors from insulated wire does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for manufacturing resistors from insulated wire, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for manufacturing resistors from insulated wire will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-420404