Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1992-08-14
1994-06-28
Falik, Andrew M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
242 708, 156447, B29C 5346, B29C 6717, B29L 3116, F16D 6900
Patent
active
053239784
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the fabrication of friction elements and, in particular, to the winding of a filament, or a tape, into a generally disc-shaped preform suitable to be cured to form a friction element.
Disc-shaped friction elements, for example, are employed as the facings for clutches, the facing being secured to a backing plate, for example, by rivets. For convenience, hereinafter in this specification, reference is made only to a friction element comprising a facing for a clutch, but it will be understood that, where appropriate, such references to a facing for a clutch refer also to any friction element made by a similar process.
Many different compositions of the filaments, and tapes, have been used in winding such preforms, for example, a composition as disclosed in British patent specification No. 2,096,654.
In present methods of winding a filament, or a tape, into a generally disc-shaped preform, the filament, or tape, is guided on to a rotating face plate by a guide which is moved in a displacement plane around a path. The shade of the path is determined by a rotating cam. The winding pattern of the filament, or tape, on to the face plate can only be varied by changing the cam for one with a different profile and only relatively simple winding patterns are possible.
It is an object of the present invention to provide a method of winding a filament, or a tape, into a generally disc-shaped preform suitable to be cured to form a friction element which allows the preform to be wound without relying on the shape of a cam to determine the movement of the guide thereby enabling more complex and consistent winding patterns to be used.
BRIEF SUMMARY OF THE INVENTION
The invention provides a method of winding a filament, or a tape, into a generally disc-shaped preform suitable to be cured to form a friction element, the method comprising planar surface extending radially of said axis, guide which is movable in a displacement plane to determine the pattern in which the filament, or tape is wound on to the planar surface, characterised in that the method also comprises the face plate about said axis, guide in the displacement plane, the demand signal being produced in response to the plate position signal and varying therewith to provide a predetermined winding pattern, the displacement plane, signal and the feedback signal by means of a closed loop control.
In a method in accordance with the invention, the winding pattern is controlled in accordance with a demand signal which allows greater complexity and consistency than present cam-based methods. For example, the pattern can be different for different parts of a preform and it can be ensured that both ends of the filament, or tape, are at an inside edge of the preform which cannot be achieved with present methods. Problems of cam wear and delays while cams are changed are also avoided.
In a method in accordance with the invention, a speed signal may be produced representing the speed of displacement of the guide in the displacement plane, and the speed signal may be utilised to limit the speed or acceleration applied to the guide. This provision can be used to reduce the possibilities of whip-like effects occurring in the filament, or tape, and the possibility of breakage.
The invention also provides apparatus for winding a filament, or a tape, into a generally disc-shaped preform suitable to be cured to form a friction element, the apparatus comprising normally of the planar surface of the face plate, tape, on to the planar surface of the face plate, determine the pattern in which the filament, or tape, is wound on to the planar surface, characterised in that the apparatus also comprises signal representative of the angular position of the face plate about said axis, produce a demand signal representative of a demanded position of the guide in the displacement plane, the demand signal varying with the plate position signal to provide a predetermined winding pattern, representative of the position of the guide
REFERENCES:
patent: 3698651 (1972-10-01), Miller
patent: 3743069 (1973-07-01), Barnett
patent: 4049482 (1977-09-01), Webb
patent: 4249704 (1981-02-01), Sakaue et al.
Falik Andrew M.
Ferodo Limited
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