Winding – tensioning – or guiding – Strand tensioning device – Brake
Patent
1981-03-23
1983-03-01
Gilreath, Stanley N.
Winding, tensioning, or guiding
Strand tensioning device
Brake
242 754, 2421298, 57 13, 87 21, 188 719, 188 83, B65H 5904
Patent
active
043752799
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Technical Field
This invention relates generally to a bobbin assembly and more particularly to a bobbin assembly for simultaneously disposing a plurality of wires and controllably maintaining a predetermined tension of low magnitude on the wires.
Background Art
In the construction of multiple ply, wire-wound articles, such as high pressure hydraulic hose, it is highly desirable that each individual wire be equally tensioned and that each multiple wire ply of the construction be applied at a predetermined, uniform tension. In the construction of a typical high pressure hose as many as 100 to 150 individual wires may be simultaneously wound about a mandrel. If each wire is not uniformly tensioned, the lesser-tensioned strands will have a tendency to lie above the plane of adjacent wires, and higher-tensional wires will have a tendency to become buried in preceding plys and lie below adjacent wires. Unequal wire tension results in non-uniform wire lay, poor radial positioning of individual strands, and a less than desirable finished product.
In response to the desire to construct high quality wire-wound articles, a number of attempts have been made to control the tension of wire strands during construction of such articles. One approach has been to employ a spring biased take-up device between the wire supply reel and the article being constructed. Such devices are effective for controlling slack in the wire but generally provide inadequate control of wire tension.
Other attempts to control wire tension are directed to the provision of various supply reel braking devices such as the spring-loaded brake shoes disclosed in U.S. Pat. No. 3,720,054, issued to Rudolf H. Haeknel, et al, on Mar. 13, 1973. Supply reel braking devices have, heretofore, been only limitedly successful in controlling wire tension. Generally, currently known braking devices are bulky, do not provide equal braking action throughout each revolution of the supply reel, and suffer from a variation of tension control in response to the rotational speed of the reel. In addition, current braking devices require frequent readjustment during operation and do not lend themselves to incorporation in multiple reel bobbin assemblies.
The present invention is directed to overcoming one or more of the problems as set forth above, and includes a bobbin assembly having a plurality of spool assemblies mounted on a common shaft. Each of the spool assemblies has a wire supply reel and an adjustable brake assembly internally disposed within the reel. The brake assembly controllably maintains a uniform predetermined tension on the wire as the wire is dispensed to an article.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the present invention, a bobbin assembly for dispensing a plurality of wires and controllably maintaining a predetermined tension on the wires, includes a shaft, a plurality of hubs mounted on the shaft in a fixed relationship with the shaft, and a plurality of reels each rotatably mounted on a respective hub. The bobbin assembly also includes a friction member positioned between a pair of reaction members on each of the hubs and a means for biasing at least one of the reaction members toward an associated friction member.
In the construction of a high quality, multiple-ply, wire reinforced hose, it is required that each of the individual strands of wire be supplied to a forming mandrel at a uniform predetermined tension. The present invention solves this problem by providing each spool of a multiple spool bobbin assembly with an internally positioned, adjustable brake assembly. The brake assembly imparts controllable and uniform resistance to the rotation of a supply reel and maintains a uniform tension on the wire throughout each revolution of the reel.
The present invention provides a bobbin assembly that enables the construction of a wire-wound article having a more uniform wire lay, i.e., less high or buried wires, and improved radial positioning of the applied wires. The present invention also provides
REFERENCES:
patent: 2277134 (1942-03-01), Nelson
patent: 2385479 (1945-09-01), Underhill
patent: 2405446 (1946-08-01), Perrault
patent: 2445607 (1948-07-01), Ghetto
patent: 3137985 (1964-06-01), Bailey
patent: 3439483 (1969-04-01), Brown
patent: 3590567 (1971-07-01), Bonikowski et al.
patent: 3720054 (1973-03-01), Haehnel et al.
patent: 3907229 (1975-09-01), Iannucci et al.
Caterpillar Tractor Co.
Gilreath Stanley N.
McFall Robert A.
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