US 4,667,576 A · Friction yarn false twisting apparatus

Abstract

A yarn false twisting apparatus is disclosed which comprises a pair of rotating circular discs having cooperating friction surfaces for engaging a running yarn at a twisting zone. A pressure applying member is positioned to apply a biasing force to the rear surface of one of the discs locally at the twisting zone, and the pressure applying member comprises a receptacle slideably mounting a piston which extends from the end of the receptacle to engage the disc. The receptacle is eccentrically mounted to permit selective positioning of the biasing force with respect to the yarn path of travel. The discs are mounted on pivotal rocking arms whereby the ratio of yarn twist to yarn speed may be adjusted, and an eccentrically mounted pin provides closely controlled adjustability for the arms and thus the twist ratio. The apparatus may be readily configured to provide either S or Z twist, and the drive system may be disengaged while in either the S or Z twist configuration to terminate rotation of the discs and thereby facilitate yarn thread-up.

Claims10

Dependent claims

An apparatus adapted for applying a biasing force to an adjacent member which is moving relative thereto, and comprising

a receptacle having an internal passageway,
a piston slideably mounted in said passageway of said receptacle and extending axially from the receptacle to define a free end which is located outside of said passageway, with said free end including a first recess formed in a portion thereof and defining a transverse shoulder, and with said free end of said piston further including a second recess formed in the circumferential periphery thereof, with said second recess defining a laterally facing wall surface,
retainer means fixed to said receptacle and including a lateral tongue disposed in said first recess and overlying said shoulder to thereby limit the outward axial movement of said piston from said receptacle and thereby prevent the removal of said piston from said receptacle, and with said tongue having a thickness less than the depth of said recess whereby the free end of said piston is adapted to extend axially beyond said tongue so as to prevent contact between the tongue and the adjacent member which is engaged by said free end, and
said receptacle including a mating projection received within said second recess and adapted to engage said laterally facing wall surface to precluded relative rotation between said piston and said receptacle.

1 more element

An apparatus adapted for applying a biasing force to an adjacent member which is moving relative thereto, and comprising

a receptacle having a cylindrical outer surface and an internal passageway,
a piston slideably mounted in said passageway of said receptacle and extending axially from the receptacle to define a free end, and
means mounting said receptacle to a supporting member having an internal cylindrical mounting bore, and comprising a sleeve having a cylindrical outer surface closely received in said cylindrical mounting bore and defining a sleeve axis, said sleeve further having a cylindrical internal bore which is eccentrically disposed with respect to said sleeve axis, and with said cylindrical outer surface of said receptacle being closely received in said internal bore of said sleeve, and whereby relative rotation between said sleeve and said supporting member results in the receptacle being moved laterally with respect to said sleeve axis.

An apparatus adapted for applying a biasing force to an adjacent member which is moving relative thereto, and comprising

a receptacle including a cylindrical outer surface and an internal passageway,
a piston slideably mounted in said passageway of said receptacle and extending axially from said passageway to define a free end, with said free end including a recess formed in a portion thereof and defining a transverse shoulder,
retainer means fixed to said receptacle and including a lateral tongue disposed in said recess and overlying said shoulder to thereby limit the outward axial movement of said piston from said receptacle and thereby prevent the removal of said piston from said receptacle, and with said tongue having a thickness lens than the depth of said recess whereby the free end of said piston is adapted to extend axially beyond said tongue so as to prevent contact between the tongue and the adjacent member which is engaged by said free end, and
means mounting said receptacle to a supporting member having an internal cylindrical mounting bore, said mounting means comprising a sleeve having a cylindrical outer surface defining a sleeve axis and an internal cylindrical bore which is eccentrically disposed with respect to said sleeve axis, and with said cylindrical outer surface of said sleeve being closely received in said mounting bore of said supporting member and said cylindrical outer surface of said receptacle being closely received in said bore of said sleeve, and whereby relative rotation between said sleeve and supporting member results in the receptacle being moved laterally with respect to said sleeve axis.

1 more element

Dependencies are inferred from the claim text.

Friction yarn false twisting apparatus

Life of this patent

Friction yarn false twisting apparatus

Life of this patent

Abstract

Claims10