US3855773A

US3855773A - Two-for-one twister

Info

Publication number: US3855773A
Application number: US00357650A
Authority: US
Inventors: J Davis
Original assignee: Phillips Fibers Corp
Current assignee: Phillips Fibers Corp
Priority date: 1973-05-07
Filing date: 1973-05-07
Publication date: 1974-12-24
Anticipated expiration: 1991-12-24

Abstract

The capacity of a two-for-one twister is increased by eliminating the cover and utilizing caps on the ends of the bobbin, the diameter of the caps being greater than the diameter of the body of wound yarn, and the lower bobbin cap having a diameter greater than the diameter of the rotor so that the yarn emerging from the spindle and passing through a yarn guide on the rotor makes contact with the outer periphery of the lower bobbin cap during the initial portion of the time required to bring the spindle from rest to the desired rate of rotation.

Description

ited States Patent 1191 Davis Dec. 24, 1974 [54] TWO-FOR-ONE TWISTER 2,782,590 2/1957 Lowe 57 5852 2,795,102 6/1957 Brown 57/5872 [75] Inventor: James Dav, Greenvllle, 2,873,570 2/1959 Sage 57/5872 7 Assignee; Phillips Fibers Corporation, 3,530,658 9/1970 .lohnson.. 57/5883 X Greenville, 3,640,060 2/1972 Boyer 57/5884 [22] Filed: May 1973 Primary Examiner-John Petrakes [21] Appl. No.: 357,650

[57] ABSTRACT [52] US. Cl 57/5883, 57/58.49, 57/5884 The capacity f a two for ene twister is increased by [51] 11117. Cl D0lh 7/86 eliminating the cover and utilizing caps on the ends of [58] Fleld of Search 57/5849. 58.52, 58.7, h bobbin the diameter f the caps being greater 57/5872 5833! 58-84, 58-86 than the diameter of the body of wound yarn, and the lower bobbin cap having a diameter greater than the [56] References cued diameter of the rotor so that the yarn emerging from UNITED STATES PATENTS the spindle and passing through a yarn guide on the 2,560,848 7 1951 Cochran 57 5884 rotor makes tact with the outer periphery of the 2,638,732 5/1953 Sabaton 57/5883 lower bobbin cap during the initial portion of the time 2,715,811 8/1955 Kellogg 57/5884 required to bring the spindle from rest to the desired 2,731,786 1/1956 Klein 57/58.83 rate of rotation, 2,731,787 1/1956 Marsh 57/58.83 2,758,437 8/1956 Lattion 57/5883 X 6 Claims, 2 Drawing Figures 1 TWO-FOR-ONE TWISTER The invention relates to an improved spindle apparatus for introducing true twist into yarn.

The utilization of two-for-one twisters for imparting true twist to yarn is well established. These twisters generally employ a spindle pot or cover to contain the feed yarn and to provide a smooth rubbing surface for the yarn during start-up of the spindle and initial formation of the balloon. The use of such covers obviously limits the diameter of the feed package to sizes smaller than the internal diameter of the cover. Even in those instances where a cover has not been employed, the diameter of the feed package has been limited to sizes which are smaller than the spindle rotor and the diameter of the spindle rotor is only slightly larger than the diameter of the cover, if employed. Thus, the capacity of such two-for-one twisters has been limited.

Accordingly, it is an object of the present invention to provide a new and improved two-for-one twister system which can process feed yarn packages having significantly larger diameters. Another object of the invention is to reduce the doffing time per pound of feed yarn in the production of the feed yarn packages. Yet another object of the invention is to reduce the set-up time per pound of yarn processed through a two-forone twister. other objects, aspects and advantages of the invention will be apparent from a study of the specification, the drawings and the appended claims to the invention.

In accordance with the present invention, it has been discovered that the foregoing objectives can be achieved by eliminating the cover and utilizing bobbin caps, at least the lower one of which has a diameter greater than the diameter of the rotor so that the yarn emerging from the spindle and passing through a yarn guide on the rotor makes contact with the outer periphery of the lower bobbin cap during the initial portion of the time required to bring the spindle from rest to the desired rate of rotation.

IN THE DRAWINGS:

FIG. 1 is an elevational view, partly in cross section, of a two-for-one twister in accordance with the present invention; and

FIG. 2 is a fragmentary view, in cross section, of the spindle and rotor components of FIG. 1.

Referring now to the drawing in detail, the illustrated coverless two-for-one yarn twister has a support bracket 11 and a spindle l2. Bearing means 13, 14 and 15 are positioned in support bracket 11 to mount spindle 12 for rotation of spindle 12 about its longitudinal axis. The axis of rotation will generally be vertical, but can be inclined at an acute angle to the vertical, generally less than about 30 to the vertical. A belt 16 is passed in frictional contact with the periphery of pulley 17, mounted on spindle 12 between

bearings

14 and 15, to effect the rotation of spindle 12 about its longitudinal axis. Spindle 12 is provided with

annular shoulders

18, 19 and 21 which rest on

bearings

13, 14 and 15, respectively.

A rotor support hub 22 is secured on spindle 12 at a location above shoulder 21 for rotation with spindle 12. A rotor 23 is mounted on hub 22 for rotation therewith. The inner ring of bearing 24 is mounted on spindle 12 at a location above hub 22 and is supported by shoulder 25. The stator hub 26 is mounted on the outer ring of bearing 24, and thus is free of the rotative effect of spindle l2 and accordingly does not rotate with the spindle 12. An annular bobbin support plate 27 is mounted on stator 26 and extends outwardly in a plane perpendicular to the longitudinal axis of spindle 12. An annular disc 28 is mounted on hub 26 coaxially with spindle 12 to serve as a stabilizing weight and as a centering means for positioning the yarn package 31 coaxially with spindle 12. The outer diameter of disc 28 is slightly smaller than the internal diameter of the yarn package 31.

Yarn package 31 comprises a cylindrical bobbin 32, an upper bobbin cap 33, a lower bobbin cap 34, and a body 35 of wound yarn. The bobbin 32 is sometimes called a tube, pirn, or cop. Bobbin cap 33 comprises an annular flange 36 and a split-ring retention clasp 37. Clasp 37 releasably grasps the end of bobbin 32, and is provided with a groove in the outer periphery thereof to support flange 36. Similarly, bobbin cap 34 comprises an annular flange 38 and split-ring retention clasp 39 which is releasably secured to the lower end of bobbin 32.

Flanges

36 and 38 extend radially outwardly from bobbin 32 in respective planes which are perpendicular to the longitudinal axis of spindle 12.

A yarn tensioning device 41 is mounted on the upper end of tube 42, which is supported by externally threaded sleeve 43 and nut 44 on stator hub 26. Spindle 12 is provided with a yarn passageway 45 extending axially downwardly from the upper end thereof to a point adjacent rotor 23 and then radially outwardly. A yarn passageway 46 is provided in rotor hub 22 and a yarn guide passageway 47 is provided in a flange 48 which extends downwardly from the lower side of rotor 23. As yarn 49 is unwound from the body 35, it passes outwardly and upwardly past the outer periphery of flange 36 and then downwardly through yarn tensioning means 4], tube 42 and passageway 45, and then outwardly through

passageways

46 and 47. The yarn 49 then balloons outwardly as it passes from contact with the outer periphery of flange 38 to yarn guide 51 positioned above the two-for-one twister and in coaxial alignment with spindle 12.

In accordance with the present invention, the outer diameters of flange 38 is greater than the maximum diameter of the body 35 of wound yarn, and is also greater than the maximum diameter of rotor 23 in or above the path of the yarn so that the yarn emerging from the yarn passageway 45 of spindle l2 and passing through the yarn guide 47 on rotor 23 makes contact with the outer periphery of flange 38 during the initial portion of the time required to bring the spindle 12 from rest up to the desired rate of rotation about the longitudinal axis of spindle 12. The outer diameter of flange 36 is significantly greater than the maximum diameter of the body 35 of wound yarn so that the yarn being unwound from the yarn package 31 makes contact with the outer periphery of flange 36 before entering yarn tensioning means 41 and yarn passageway 45 during the time required to bring spindle 12 from rest up to the desired rate of rotation about the longitudinal axis of spindle l2, and preferably during operation at the desired rate of rotation of spindle 12.

In one embodiment the

caps

33 and 34 are secured to the bobbin 32 at the time the body 35 of yarn is wound onto bobbin 35, permitting the formation of a cylindrical body of wound yarn extending from one bobbin cap to the other bobbin cap. This provides the maximum amount of yarn for a given maximum diameter of body 35, a significant increase over tapered packages wound on bobbins not having caps.

Reasonable variations and modifications are possible within the scope of the foregoing disclosure, the drawings and the appended claims to the invention.

That which is claimed is:

l. A coverless two-for-one yarn twister comprising a support bracket, a spindle, means mounting said spindle in said support bracket for rotation about the longitudinal axis of said spindle, a rotor means mounted on said spindle above said bracket for rotation with said spindle, said spindle being provided with a yarn passageway extending axially from the upper end thereof to a point adjacent said rotor means and then radially outwardly, said rotor means being provided with yarn guide means, bearing means mounted on said spindle above said rotor means and having an outer member which does not rotate with said spindle, bobbin support means mounted on said outer member of said bearing means and having a bobbin support surface extending outwardly in a plane perpendicular to said longitudinal axis of said spindle, a cylindrical bobbin, centering means on said bobbin support means for positioning said bobbin in a position coaxial with said spindle, a first annular bobbin cap adjacent the end of said bobbin closest to said rotor means and extending radially outwardly from said bobbin in a plane perpendicular to said longitudinal axis of said spindle, a second annular bobbin cap adjacent the other end of said bobbin and extending radially outwardly from said bobbin in a plane perpendicular to said longitudinal axis of said spindle, the diameter of said first and second bobbin caps being greater than the diameter of the yarn package formed on said bobbin, the diameter of said first bobbin cap being significantly greater than the maximum diameter of said rotor means above the path of the yarn so that the yarn emerging from the yarn passageway of said spindle and passing through said yarn guide means on said rotor means makes contact with the outer periphery of said first bobbin cap during the initial portion of the time required to bring said spindle from rest to the desired rate of rotation about said longitudinal axis, the diameter of said second bobbin cap being significantly greater than the diameter of the yarn package formed on said bobbin so that the yarn being unwound from said yarn package and entering the yarn passageway of said spindle makes contact with the outer periphery of said second bobbin cap during the initial portion of the time required to bring said spindle from rest to the desired rate of rotation about said longitudinal axis.

2. Apparatus in accordance with claim 1 wherein said bobbin support means comprises an annular support plate and means for coaxially mounting said annular support plate on said outer member of said bearing means in a plane perpendicular to the longitudinal axis of said spindle, and wherein said centering means comprising an annular disc have an external diameter slightly smaller than the internal diameter of said bobbin and means for coaxially mounting said annular disc on said outer member of said bearing means in a plane perpendicular to the longitudinal axis of said spindle.

3. Apparatus in accordance with claim 1 wherein the diameter of said second bobbin cap is sufficiently great to cause the yarn being unwound from said yarn package and entering the yarn passageway of said spindle to contact the outer periphery of said second bobbin cap during operation of said spindle at said desired rate of rotation.

4. Apparatus in accordance with claim 1 wherein said first and second bobbin caps are secured to said bobbin.

5. Apparatus in accordance with claim 4 wherein the yarn package formed on said bobbin in a cylindrical body extending from the first bobbin cap to said second bobbin cap.

6. Apparatus in accordance with claim 1 wherein said first and second bobbin caps are releasably secured to said bobbin.

Claims

1. A coverless two-for-one yarn twister comprising a support bracket, a spindle, means mounting said spindle in said support bracket for rotation about the longitudinal axis of said spindle, a rotor means mounted on said spindle above said bracket for rotation with said spindle, said spindle being provided with a yarn passageway extending axially from the upper end thereof to a point adjacent said rotor means and then radially outwardly, said rotor means being provided with yarn guide means, bearing means mounted on said spindle above said rotor means and having an outer member which does not rotate with said spindle, bobbin support means mounted on said outer member of said bearing means and having a bobbin support surface extending outwardly in a plane perpendicular to said longitudinal axis of said spindle, a cylindrical bobbin, centering means on said bobbin support means for positioning said bobbin in a position coaxial with said spindle, a first annular bobbin cap adjacent the end of said bobbin closest to said rotor means and extending radially outwardly from said bobbin in a plane perpendicular to said longitudinal axis of said spindle, a second annular bobbin cap adjacent the other end of said bobbin and extending radially outwardly from said bobbin in a plane perpendicular to said longitudinal axis of said spindle, the diameter of said first and second bobbin caps being greater than the diameter of the yarn package formed on said bobbin, the diameter of said first bobbin cap being significantly greater than the maximum diameter of said rotor means above the path of the yarn so that the yarn emerging from the yarn passageway of said spindle and passing through said yarn guide means on said rotor means makes contact with the outer periphery of said first bobbin cap during the initial portion of the time required to bring said spindle from rest to the desired rate of rotation about said longitudinal axis, the diameter of said second bobbin cap being significantly greater than the diameter of the yarn package formed on said bobbin so that the yarn being unwound from said yarn package and entering the yarn passageway of said spindle makes contact with the outer periphery of said second bobbin cap during the initial portion of the time required to bring said spindle from rest to the desired rate of rotation about said longitudinal axis.