US3276719A

US3276719A - Positive pickup traverse guide

Info

Publication number: US3276719A
Application number: US514058A
Authority: US
Inventors: Donald J Stetz
Original assignee: EI Du Pont de Nemours and Co
Current assignee: EIDP Inc
Priority date: 1965-12-15
Filing date: 1965-12-15
Publication date: 1966-10-04
Anticipated expiration: 1983-10-04
Also published as: DE1957413U

Description

1966 D. J. STETZ POSITIVE PICKUP TRAVERSE GUIDE Filed Dec. 15, 1965 United States Patent 3,276,719 POSITIVE PICKUP TRAVERSE GUIDE Donald J. Stetz, Seaford, DeL, assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Dec. 15, 1965, Ser. No. 514,058 3 Claims. (Cl. 242157) This invention relates generally to the production of textile fibers and more particularly to the winding of yarn at high speeds.

In a winding apparatus of the type disclosed by Altice et al. in U.1S. Patent No. 3,086,722, yarn advances through a traverse guide to a rotating package. At stringup, the yarn is brought down, attached to one end of the package support and released for pickup by the traverse guide.

Although available traverse guides are referred to as selfthreading, the yarn usually does not seat during the first traverse stroke after stringup. Instead, it has a tendency to slide over the slot for the first few strokes, until threadline tension stabilizes. During this period, the untraversed y'arn builds up on the central portion of the package support in a bunch .form. This is particularly disadvantageous in highs-peed winding of heavy denier yarn where a few strokes of the traverse guide without threadline pickup can result in a relatively large untraversed yarn wrap being formed on the package support.

According to this invention, the various problems associated with untraversed yarn wraps have been avoided with a traverse guide of the type disclosed by Altice et al. which has a modified guide plate embedded in and projecting outwardly from the molded base. The plate has an outer end and sides diverging therefrom to the base, the end being divided into spaced segments by the mouth of a guide slot. One of the sides projects farther and its adjoining end segment is spaced farther from the base than the other side and end segment. Additionally, a rod member also projects from the base and has an intermediate length contacting the plate adjacent the one end segment at the slot and overlapping both the slot and the other end segment. In its terminal length, the rod member is bent laterally away from the plate in such a manner as to present a first acute angle with the other side of the plate and a second acute angle with the plane of the plate.

Various objectives and functional advantages of the modified traverse guide will be apparent from the following description wherein reference is made to the accompanying drawing in which:

FIGURE 1 is a partially sectioned end view of a winding apparatus which includes the traverse guide of the present invention;

FIGS. 2-4 are enlarged end, top and side views, respectively, of the traverse guide shown in FIG. 1; and

'FIG. 5 is a side view of the modified guide plate per se.

In the illustrated winding apparatus, a thread or yarn normally passes through a fixed pigtail guide 12, downwardly through a reciprocating traverse guide v14 and around a motor driven print roll 16 to a package 18 wound on a package support 20. The latter is rotatably supported on a shaft 22 attached to a swing arm 24. Package 18 is surface driven, in the direction indicated, by roll 16. Before stringup, thread 10' is passed behind a rod 26 and around roll 16 to package support 20. After stringup, the package is initiated by traversing yarn 10' manually off the end of rod 26 to a position where it is in the path of travel of guide 14. The latter is engaged in the helical groove of a rotatably driven barrel cam 28 and is restricted to a reciprocating path of travel by rails 30.

3,276,719 Patented Oct. 4, 1966 As shown in FIGS. 2-4, traverse guide 14 includes a guide plate 32 and a yarn-restraining arm or rod member 34 embedded in and projecting outwardly from a molded plastic base 36. Base 36 has a cylindrical cam-engaging portion 38 and a grooved rail-engaging portion 40.

Guide plate 32 has

sides

42, 44 which converge toward

end segments

46, 48 on either side of a teardrop-shaped slot 50. Adjacent the embedded end of plate 32, a portion has been removed as shown at 52 to provide for retention in the molded base 36. Side 44 converges at a lesser angle than side 42 and its adjoining end segment 48 is closer to base 36 than is end segment 46.

Rod member 34 is formed from steel wire, has a hook length 54 embedded in rail-engaging portion 40 and projects outwardly from base 36 in an angularly disposed length 56 which approaches one face of plate 32. Arm 34 continues in an intermediate length 58 which is substantially parallel to the plane of guide plate 32, contacts the plate just below end segment 46 at the edge of slot 50, overlaps the restricted mouth of slot 50 as well as end segment 48 and is bent laterally away from plate 32 in its terminal length 60. Because of the offset between

end segments

46, 48, there is a space between length 58 and segment 48 through which yarn traverses to slot 50. This space and the angular opening between terminal length 60 and side 44 (FIG. 4) are referred to herein as a loading zone.

At stringup, yarn 10 is brought down from pigtail guide 12, around rod 26 and attached to one end of package support 20 while being traversed manually off the end of rod 26 to an uncontfined position substantially normal to the reciprocating path of .guide 14 in which position yarn 10 will be contacted either by length 56 or side 44. It first contacted by length 56, the yarn is merely deflected from its path of advance for a moment. On the return stroke of guide 14, it is engaged by side 44 and deflected outwardly to and through the loading zone between lengths 58, 60 and end segment 48=intcguide slot 50. The contact between length 58 and plate 32 just beneath end segment 46 is such that yarn 10 cannot slide beyond but is instead directed downwardly by the teardrop shape of slot 50. As a package .18 is wound, intermediate length 58 serves as a guard to prevent escape of the yarn from slot 50. The disposition of terminal length 60 at acute angles with respect to side 44 (FIG. 4) and with respect to the plane of plate 32 (FIG. 3) usually insures a positive pickup within one complete traverse cycle for guide 14 and thus cooperates with mod-ified plate 32 in the avoidance of untraversed yarn wraps.

Guide member 32 may be made from any suitable material having a high strength-toweight ratio. A wear resistant ceramic material usually is employed. When lightweight metals such as aluminum are used, they are coated with aluminum oxide or other wear resistant material. Other materials that may be used include solid (or homogeneous) aluminum oxide and synthetic sapphire. Where steel wire is used to form rod member 34, it is chrome plated to minimize projections, raised areas and nonuniformity of finish. The material employed, however, is not critical. Additional variations and adaptations of a similar nature will be apparent to those skilled in the art without departing from the spirit of my invention which is accordingly intended to be limited only by the scope of the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

'1. A traverse guide comprising: a molded base; a guide pl-a'te embedded in and projecting outwardly from the base, said plate having an outer end and sides diverging therefrom to the base, said outer end being provided with and divided into spaced segments by a guide slot, one of said sides projecting farther and its adjoining end segment being spaced farther from said base than the other side and end segment; and a rod member projecting from the base, said member having an intermediate length contacting said plate adjacent said farther spaced segment at the slot and overlapping both the slot-and said other end segment, said intermediate length being spaced from said plate at the location of the other end segment, said member extending longitudinally beyond the other end segment in a terminal length bent laterally away from the plate.

=2. The traverse guide of claim 1 wherein said rod member includes an angularly disposed length projecting outwardly from the base to its intermediate length and presenting a first yarn contact surface adapted to deflect yarn away from said slot, said other side presenting a second yarn contact surface adapted to deflect yarn between the intermediate length and said other end segment to said slot.

3. The traverse guide of claim 2 wherein said terminal length extends longitudinally at an acute angle with said other side and is bent laterally at an acute angle with the plane of said plate.

References Citedby the Examiner References Cited by the Applicant UNITED STATES PATENTS 2,323,987 7/1943 Foster.

STANL'EY N. GILREATH, Primary Examiner.

Claims

1. A TRANSVERSE GUIDE COMPRISING: A MOLDED BASE; A GUIDE PLATE EMBEDDED IN AND PROJECTING OUTWARDLY FROM THE BASE, SAID PLATE HAVING AN OUTER END AND SIDES DIVERGING THEREFROM TO THE BASE, SAID OUTER END BEING PROVIDED WITH AND DIVIDED INTO SPACED SEGMENTS BY A GUIDE SLOT, ONE OF SAID SIDES PROJECTING FARTHER AND ITS ADJOINING END SEGMENT BEING SPACED FARTHER FROM SAID BASE THAN THE OTHER SIDE AND END SEGMENT; AND A ROD MEMBER PROJECTING FROM THE BASE, SAID MEMBER HAVING AN INTERMEDIATE LENGTH CONTACTING SAID PLATE ADJACENT SAID FARTHER SPACED SEGMENT AT THE SLOT AND OVERLAPPING BOTH THE SLOT AND SAID OTHER END SEGMENT, SAID INTERMEDIATE LENGTH BEING SPACED FROM SAID PLATE AT THE LOCATION OF THE OTHER END SEGMENT, SAID MEMBER EXTENDING LONGITUDINALLY BEYOND THE OTHER END SEGMENT IN A TERMINAL LENGTH BENT LATERALLY AWAY FROM THE PLATE.