US3842578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for threading yarn into a stretch and false twist crimping machine
Assignee: Oerlikon Barmag AG
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Filing: 1972-11-02
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Granted: 1974-10-22
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Expires: 1992-11-02
Abstract
Abstract A method and apparatus for threading a combination stretch and false-twist crimping machine having feed and draw rolls which continuously draw the yarn over an elongated heated plate and through a rotatable false-twist spindle, at least one movable guide means operating to place the running yarn in contact with the heated plate only after the false-twist spindle has first been adjusted to a speed substantially smaller than its normal operating speed, the movement of the guide means being such as to maintain a substantially constant yarn length between the feed and draw rolls and thereafter adjusting the false-twist spindle to its normal operating speed.
Inventors
- 👤 H Schippers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:36
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0206; D02G1/0266; D02G1/0273
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
238 words
A method of threading an apparatus for the simultaneous stretching and false-twist crimping of a yarn composed of synthetic thermoplastic filaments wherein the yarn is continuously conducted for stretching in a normal operating path between a stretch feed point and a stretch draw point while simultaneously being subjected to a heat treatment by direct contact with an elongated heating surface in said normal operating path and also imparting a false twist to the heat treated yarn by means of a rotating false-twist spindle before the yarn reaches said stretch draw point, which process comprises: first threading the yarn from said stretch feed point to said stretch draw point through said false-twist spindle and also through a movable guide point adjacent one end of said elongated heating surface, said guide point being initially maintained in a position such that the yarn runs in a preliminary operating path which is free of contact with said heating surface; then conducting the yarn through said preliminary path while the speed of the false-twist spindle is substantially smaller than its normal operating speed; thereafter moving said guide point to bring the yarn into its normal operating path in contact with said heating surface, the movement of said guide point being such that the yarn length between said stretch feed point and said stretch draw point remains substantially constant; and subsequently increasing the speed of the false-twist spindle up to its normal operating speed.
Claim 2
Independent Claim
238 words
A method of threading an apparatus for the simultaneous stretching and false-twist crimping of a yarn composed of synthetic thermoplastic filaments wherein the yarn is continuously conducted for stretching in a normal operating path between a stretch feed point and a stretch draw point while simultaneously being subjected to a heat treatment by direct contact with an elongated heating surface in said normal operating path and also imparting a false twist to the heat treated yarn by means of a rotating false-twist spindle before the yarn reaches said stretch draw point, which process comprises: first threading the yarn from said stretch feed point to said stretch draw point through said false-twist spindle and also through a movable guide point adjacent one end of said elongated heating surface, said guide point being initially maintained in a position such that the yarn runs in a preliminary operating path which is free of contact with said heating surface; then conducting the yarn through said preliminary path while the speed of the false-twist spindle is substantially smaller than its normal operating speed; thereafter moving said guide point to bring the yarn into its normal operating path in contact with said heating surface, the movement of said guide point being such that the yarn length between said stretch feed point and said stretch draw point remains substantially constant; and subsequently increasing the speed of the false-twist spindle up to its normal operating speed.
Claim 3
Dependent Claim
16 words
A method as claimed in claim 1 wherein the yarn is composed of polyethylene terephthalate filaments.
Claim 4
Dependent Claim
174 words
In an apparatus for the simultaneous stretching and false-twist crimping of a yarn, said apparatus including spatially separated feed roll means and draw roll means for stretching a length of yarn therebetween, an elongated curved heating plate for contact with the yarn being stretched and positioned to receive the yarn from said feed roll means during normal operation and a false-twist spindle following said heating plate for imparting a temporary twist to the yarn at a point preceding said draw roll means, the improvement for threading said apparatus which comrpises at least one yarn guide means adjacent one end of the elongated heating plate for movement substantially perpendicular to said plate from an open position in which the yarn is maintained free of contact with the plate to a closed position in which the yarn is maintained in running contact with said plate, the movement of said guide means between said open and closed positions being such that the yarn length between said feed roll means and said draw roll means remains substantially constant.
Claim 5
Dependent Claim
174 words
In an apparatus for the simultaneous stretching and false-twist crimping of a yarn, said apparatus including spatially separated feed roll means and draw roll means for stretching a length of yarn therebetween, an elongated curved heating plate for contact with the yarn being stretched and positioned to receive the yarn from said feed roll means during normal operation and a false-twist spindle following said heating plate for imparting a temporary twist to the yarn at a point preceding said draw roll means, the improvement for threading said apparatus which comrpises at least one yarn guide means adjacent one end of the elongated heating plate for movement substantially perpendicular to said plate from an open position in which the yarn is maintained free of contact with the plate to a closed position in which the yarn is maintained in running contact with said plate, the movement of said guide means between said open and closed positions being such that the yarn length between said feed roll means and said draw roll means remains substantially constant.
Claim 6
Dependent Claim
54 words
An apparatus as claimed in claim 3 including a plurality of yarn guide means to traverse the yarn back and forth at least twice across said heated plate, there being at least one of said movable yarn guide means at a deflection point of the traversing yarn adjacent one end of the heating plate.
Claim 7
Dependent Claim
108 words
An apparatus as claimed in claim 4 wherein said heated plate is positioned at the upper end of the stretch and false-twist crimping apparatus, the movable yarn guide means being pivotably mounted on an extension rod means for introduction of the yarn first on a line parallel to the heating plate up to a position at the upper end of the heating plate corresponding to said open position and then in a direction approximately perpendicular to the heating plate through the pivotal movement of the yarn guide means into a position corresponding to said closed position in which the yarn is maintained in running contact with the plate.
Claim 8
Dependent Claim
49 words
An apparatus as claimed in claim 5 wherein said movable yarn guide means is connected by one arm of a two-armed lever to said extension rod means, the other arm coacting with a projecting boss of the apparatus casing to move said yarn guide means into its closed position.
Claim 9
Dependent Claim
59 words
Apparatus as claimed in claim 5 wherein said movable yarn guide means is fixed at the free end of the extension rod which in turn is pivotally fastened on an axis parallel to the heating plate for moving said yarn guide means through an arc between its open and closed positions adjacent the upper end of the heating plate.
Claim 10
Dependent Claim
61 words
Apparatus as claimed in claim 5 wherein said heating plate is maintained within a substantially enclosed heating box having insulated walls provided with a relatively small opening for entry and withdrawal of said extension rod and the movable yarn guide means associated therewith, thereby permitting the yarn to be initially applied to the yarn guide means externally of the heating box.
Claim 11
Dependent Claim
113 words
An apparatus as claimed in claim 3 including a plurality of yarn guide means to conduct the yarn back and forth through the zone of the heating plate around a deflection point at one end of the heating plate such that the back and forth paths of the yarn are substantially parallel to each other, there being provided two movable yarn guide rods at the other end of the heating plate to carry the parallel running yarn paths and to provide a movement by at least one of said guide rods perpendicularly to the heated surface of the heating plate and a combined movement of both rods to maintain said constant yarn length.
Claim 12
Dependent Claim
37 words
An apparatus as claimed in claim 3 wherein said at least one movable yarn guide means follows the path of a curve which is approximately the involute of the curved yarn contacting surface of the heated plate.
Claim 13
Dependent Claim
33 words
A method as claimed in claim 1 wherein said yarn is conducted through said preliminary path at a false-twist spindle speed which is more than 20 percent smaller than its normal operating speed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |