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1. WO1991015354 - FABRICATION D'ELEMENTS DE FRICTION

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

C LA IM S

1. A method of winding a filament, or a tape,
(34) into a generally disc-shaped preform suitable to be cured to form a friction element, the method compri sing
rotating a face plate (12) about an axis,
the face plate having a substantially planar surface (36) extending radially of said axis,
and guiding said filament, or tape, (34) on to said planar surface by means of a guide (52) 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
producing a plate position signal representative of the angular pos tion of the face plate (12) about said axis,
producing a demand signal representative of a demanded position of the guide (52) 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,
producing a feedback signal representative of the position of the guide (52) in the displacement plane,
and moving the guide (52) in the displacement plane as a function of the demand signal and the feedback signal by means of a closed loop control
(68).

2. A method according to Claim 1, wherein a speed signal is produced representing the speed of displacement of the guide (52) in the displacement plane, and the speed signal is utilised to limit the speed or acceleration applied to the guide.

3. Apparatus for winding a filament, or a tape, (34) into a generally disc-shaped preform suitable to be cured to form a friction element, the apparatus comprising
a face plate (12) having a substantially planar surface (36),
rotating means (16) operable to rotate the face plate (12) about an axis extending normally
of the planar surface of the face plate,
a guide (52) for said filament, or tape, arranged to guide the filament, or tape, on to the planar surface (36) of the face plate,
and moving means (56; 102) operable to move the guide in a displacement plane to determine the pattern in which the filament, or tape, is wound
on to the planar surface (36), characterised in that the apparatus also comprises
angular position determining means (70) operable to produce a plate position signal representative of the angular position of the face plate (12) about said axis,
producing means operable in response to the plate position signal to produce a demand signal
representat ve of a demanded position of the guide
(52) in the displacement plane, the demand signal varying with the plate position signal to provide a predetermined winding pattern,
guide position determining means (80) operable to produce a feedback signal representative of the position of the guide (52) in the displacement plane,
and closed loop control means (68) operable to control the operation of the moving means (56;
102) so that the guide (52) is moved in the displacement plane as a function of the demand signal and the feedback signal.

4. Apparatus according to Claim 3, characterised in that the moving means (56) is operable to move the guide (52) arcuately in the displacement plane.

5. Apparatus according to Claim 4, characterised in that the moving means is also operable to move the guide (52) linearly towards or away from the axis of the face plate (12).

6. Apparatus according to either one of Claims

4 and 5, characterised in that the filament, or tape, (34) in passing through the guide (52) passes through the centre of curvature of the arc aLong which the guide moves.

7. Apparatus according to any one of Claims 3 to 6, characterised in tha"t the apparatus also comprises speed detecting means (82) operable to produce a speed signal representati e of the speed of disolacement of the guide (52) in the displacement plane, and the control means (68) utilises the speed signal to li it the speed or acceleration of the guide (52).