Winding – tensioning – or guiding – Strand tensioning device – Magnet
Patent
1981-01-09
1982-12-07
Gilreath, Stanley N.
Winding, tensioning, or guiding
Strand tensioning device
Magnet
B65H 5910
Patent
active
043622798
DESCRIPTION:
BRIEF SUMMARY
In the winding of a coil it is necessary, in the interest of a good coiling factor and for a low use of wire, that the wire at the winding station always remains under a predetermined minimum tension; the wire is, accordingly, conducted through a wire brake ahead of the winding station. This wire brake should be so constructed that it will not adversly affect the wire and especially its insulation.
The fulfillment of the previously mentioned requirements on a wire brake presents considerable difficulties when the wire length which is necessary for the production of a winding per unit of time will vary periodically, which is the case during the winding of coils whose configuration deviates from a circular form. Particularly large are these variations in coils with rectangular configurations and unfavorably large ratios of the coil length relative to the coil width, for example, such as are required for lighting fixtures.
Especially critical is the described problem at extremely rapidly running winding machines since here the required wire speed varies between extremely low and extremely high values. Known wire brakes must hereby be set to such high braking values so as to frequently cause tearing of the wire.
The invention solves the addressed problem with a wire brake which is characterized in that the wire which is to be braked is wound in a single layer by a plurality of pressure strands of a pressure cable, which is tensioned between a support frame and a carriage displaceably supported therein by means of a tensioning device and that the pressure strands at one end of the pressure cable are fastened to a correcting element which is rotatably supported in the carriage or within the support frame.
Such a wire brake does not require any additional guide rolls for the wire, whose mass would accelerate the wire during the braking phase.
The braking power is determined by the length of the pressure cable and the extent of motion of the braking strands which is manually or in a motorized mode are adjustable by means of the correcting element, wherein this extent of motion is a measure for the compressive force and the braking surface depends upon the length of the braking cable. A high braking power can thus be distributed over a large surface of the wire so that also hereby there will not occur any adversly affect over the wire or its insulation.
Pursuant to a modification of the invention, the braking effect can be improved even with a more protective handling of the wire in that a specialized braking cable is arranged between the wire which is to be braked and the pressure strands which also consists of a plurality of braking strands wound in a single layer about the wire, which at one end thereof are clamped into the support frame through the intermediary of a twisting device. Hereby, the properties of the braking cable can be optimized exclusively towards its braking function since it itself is practically not subjected to any tensile stress. Accordingly, for the braking strand there can thus be selected such a material which is so soft whereby the surface of the wire which is located within the braking cable stands for at least up to 50% in contact with the braking strands; with the utilization of soft leather strips, even with an almost 100% encompassing can be combined with an extremely protective handling of the insulation. The concept of winding of the strands of the braking and pressure cable can be either in the same direction or in an opposite sense.
The functional division between a braking cable and a pressure cable further renders it possible that also for the pressure cable there can be utilized a material which is optimal for this function; coming into consideration hereby are perlon strands, as well as those formed of steel fibers.
The invention also facilitates the simple holding constant of a predetermined wire tension with the aid of controller, in particular a three-point controller, so that it is no longer necessary to set an excessively high brake power for reasons of safety.
The inve
REFERENCES:
patent: 2426631 (1947-09-01), Mapes
patent: 3099419 (1963-07-01), Kerch et al.
patent: 3164335 (1965-01-01), Dammar
Gilreath Stanley N.
Siemens Aktiengesellschaft
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