Pre-twist group twinner and method of manufacturing communication cables for high frequency use
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Feb 11, 1998
filing date -
Feb 11, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus is disclosed for manufacturing communication cables with improved, more uniform impedance characteristics at signal frequencies up to and above 600 MHz. The apparatus includes an 'inside-out' rigid twisting machine and at least two bobbins supported within each such machine. Each rigid twisting machine includes a drive for spinning each of the bobbins about their respective axes, and fly-off arrangement is provided for flying off an insulated conductor wire wound on each of the bobbins with substantially no tension in the wire when the bobbin attains a first rotational speed. Guides are provided for guiding the wires from each of the bobbins to a closing point where the wires are closed. A double twist bow arrangement is provided which includes second drive for twisting the closed wires at a second rotational speed to form a twinned cable. Controls are provided for adjusting the first and second rotational speeds to apply a pre-twist to each of the wires about their individual neutral axes prior to twinning, after which a take-up is provided for taking up the twin cable. A bank or line of rigid twisting machines are preferably used to produce two or more twinned cables, which all can then be twinned or twisted about each other to form a multi-cable assembly.
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