US 4,997,528 AGranted

Mold for, and method of, fabricating a perforated body and perforated body for use as a friction spinning element

AssigneeMaschinenfabrik Rieter AG

InventorWerner Oeggerli

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Abstract

The mold for producing a perforated body to be used as a friction spinning element comprises a mold body provided with throughpass holes extending between the opposite mold body surfaces. Each of the throughpass holes is filled with a non-conducting material. Thus, there can be simultaneously formed by electroforming at the opposite mold body surfaces two perforated bodies which may be of the same or different thickness. By virtue of the simultaneous fabrication of the two perforated bodies the openings or perforations thereof are exactly in alignment or coincident and, if desired, these two perforated bodies can be secured to one another in superposed orientation to form a composite friction spinning element, such as a friction spinning plate or disc or an endless friction spinning belt or band.

Claims25

Dependent claims

A mold for use in an electroforming process for fabricating a rigid perforated body for receiving textile fibers deposited on a fiber receiving surface of the perforated body by means of an airstream and for passage of the airstream through perforations of the perforated body, said mold comprising:

an electrically conductive mold body defining two opposite sides and respective surfaces on said two opposite sides;
said electrically conductive mold body containing a predetermined number of open-ended holes each extending between said two opposite sides and each having a predeterminate cross-sectional configuration of substantially constant diameter throughout its length between said two opposite sides;
said predetermined number of open-ended holes being arranged in said electrically conductive mold body in a predetermined distribution corresponding to a predetermined number and distribution of perforations in the rigid perforated body to be electroformed at the electrically conductive mold body;
each one of said predetermined number of holes being filled by an inset electrical insulator filling to the level of said respective surfaces on said two opposite sides of said electrically conductive mold body;
and
said respective surfaces on said two opposite sides of said electrically conductive mold body being free of electrical insulator material for simultaneously electroforming two of said rigid perforated bodies one on each of said two opposite sides of said electrically conductive mold body.

3 more elements

A method of fabricating at least one perforated body for receiving textile fibers deposited on a fiber receiving surface of the perforated body by means of an air stream and containing perforations through which the air stream is passed and which widen in a predetermined direction, comprising the steps of:

providing a mold having two opposite sides for the formation of two respective perforated bodies and containing electrical insulator fittings in open-ended holes, which extend between the two opposite sides of said mold, at a predetermined number of locations corresponding to the locations of the perforations in the two perforated bodies to be fabricated;
substantially simultaneously electroforming on said two opposite sides of said mold, the two respective perforated bodies containing perforations which widen in the predetermined direction;
and
separating said two perforated bodies from said two opposite sides of said mold.

1 more element

Dependencies are inferred from the claim text.