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US 4,071,394 AGranted
Apparatus for manufacturing non-woven fabric tubular filter
AssigneeOlympic Engineering Co.
InventorHarry Ball
Life of this patent
Estimating the term…
Abstract
A non-woven fabric web is converted to a tubular shape by forming the web between a cylindrical mandrel and surrounding sleeve, and passing reciprocating barbed needles through the region where the sides of the web abut each other, to form a butt joint thereat. The apparatus includes a pair of rollers for drawing the tubular shaped web between the mandrel and sleeve, as well as a motor and control circuit for operating the reciprocating needles.
Claims5
Apparatus for manufacturing a tubular filter from a non-woven fabric web, comprising:
- a cylindrical mandrel;
- a guide sleeve coaxial with and surrounding at least a portion of the length of said mandrel;
- means for drawing said web onto said mandrel between said sleeve and said mandrel to form said web into a tubular shape with the sides of said web in abutting relationship;
- at least one needle having a plurality of barbed portions;
- means for holding said needle in a first needling position extending transversely of said mandrel and sleeve through the space therebetween;
- and
- means for transversely reciprocating said needle holding means.
4 more elements
Dependencies are inferred from the claim text.