Textiles: spinning – twisting – and twining – Apparatus and processes – Alternate twist
Patent
1997-03-17
1998-09-01
Stryjewski, William
Textiles: spinning, twisting, and twining
Apparatus and processes
Alternate twist
57 99, 57294, D01H 500
Patent
active
057994773
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a device for making a wire strand with changing twist direction (SZ-stranding) from individual wires and in particular to a device of a type a fixed guide provided with bores for receiving the individual wires and a plurality of spaced apart storing disks capable of being driven in changing directions and also having bores for receiving the individual wires to be stranded, and a laying disk capable of being driven via drive disks and transmission members.
In known devices of this type, the laying disks are driven by the associated driving disks via mechanisms with correspondingly different speed increasing ratios. This, however, has the disadvantage that relatively large masses have to be braked within a short time and accelerated again in the opposite direction. This is especially disadvantageous for those laying disks which have a large twisting angle.
SUMMARY OF THE INVENTION
It is the object of the invention to obviate these disadvantages and to propose a device of the abovementioned type where the direction of only relatively small masses will have to be reversed.
The object of the invention is achieved by providing a drive common to at least a portion of the drive disks, wherein between the drive and the drive disks there is disposed a torsionally elastic shaft having an arbitrary cross-section. These features make it possible that at least a portion of the drive disks connected to each other via the torsionally elastic shaft does not require a separate speed increasing mechanism, since this function is provided by the torsionally elastic shaft. The decreasing twisting angles required for proper stranding which decrease in relation to the fixed guide, result from the decreasing twist of the torsionally elastic shaft in relation to its fixed end.
A preferred embodiment of the invention for wire stranding machines where large stranding forces for the items to be stranded are required, includes at least two adjacent drive disks coupled together via a rigid shaft, with the drive disks having different speed increasing ratios with respect to their associated laying disks.
The twisting action is at all possible and can be improved by maintaining the torsionally elastic shaft under tension.
Preferably, the torsionally elastic shaft is formed as a torsion spring or a torsion bar which is connected to the drive disks in a torsion-free manner. This is from an engineering standpoint, a very simple solution.
According to another feature of the present invention, the spring constant of the torsion spring and the torsion bar, respectively, increases in the direction towards the drive. In this manner, a different stiffness of the spring or rod, as the case may be, is obtained along the length of the torsion spring or the torsion bar, respectively, whereby the mass inertia of the torsionally elastic shaft can be compensated at high accelerations.
In one embodiment of a device of the invention the excursion of the filament-shaped or strip-shaped element and the lengthening caused thereby, creates a corresponding restoring force, resulting in an action similar to a torsion spring, wherein, however, the filament-shaped or strip-shaped element itself does not experience a significant torsion. If the radial distance between the bores for receiving the filament-shaped or strip-shaped element and the rotation axis of the drive disks is increased when moving in the direction from the fixed guide towards the motor, then the twisting angles of the laying disks will in turn decrease when moving from the region proximate to the motor to the region proximate to the guide.
Advantageously, the torsionally elastic shaft is formed by a cable or strip secured by a spring. In this manner, overloading of the cable can positively be prevented.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be explained in further detail with reference to the drawing, in which:
FIGS. 1 and 2 show schematically two different embodiments of devices according to the invention,
FIG. 3 shows
REFERENCES:
patent: 3187495 (1965-06-01), Christian
patent: 3572024 (1971-03-01), Lyons
patent: 4429519 (1984-02-01), Garner et al.
patent: 4493182 (1985-01-01), Vogelsberg
patent: 5545089 (1996-08-01), Kirschey
patent: 5606357 (1997-02-01), Bekki
Feiereisen Henry M.
Ludwig Bergsmann
Stryjewski William
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