Abstract:
A ball of hand knitting yarn is formed by winding the yarn in an overlapping constantly progressing angular winding to form a partial sphere, thereafter continuing the winding by applying a plurality of turns of said yarn in substantially parallel circumferential turns about substantially a central equator of the ball and subsequently finishing the winding with a plurality of overlapping progressively angled windings so as to hide the circumferential turns.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to the formation of packages of hand knitting yarn and in particular to balls thereof. 
     It has long been the practice to package yarn for hand knitting in hanks or skeins which then had to be unpackaged by the user and rewound in balls, so that the yarn could easily be handled without knitting or ravelling. Recently, automatic machines have been developed by which balls have been directly wound and banded into packages, in which the yarn has been wound in a pattern which can easily be unthreaded and directly used by the knitter. 
     One such machine for fully automatic balling and banding of yarn is distributed in the United States by the G &amp; W Maschinen AG, CH 8330 Pfaffikon, Zurich, Switzerland, under Model No. WBAN 204/305 and 205/305. 
     In this machine the balls are formed on a rotating, expansible arbor, by feeding the yarn on a thread flyer or guide arm which arm makes a complexedly curved swinging movement simultaneously about the arbor. The combination of rotation of the arbor and the movement of the guide cooperate to wind the yarn in an overlapping constant angular progression, substantially like a figure eight pattern. On completing the winding of a predetermined amount of yarn a substantially spherical ball is formed, after which the arbor is collapsed and the ball doffed or removed from the arbor. Thereafter a printed band is placed about the ball to complete the package. Because the ball is wound on the expanded arbor only, its doffing results in a collapse and distortion of the ball which causes difficulty in applying the banding. 
     It is the object of the present invention to overcome this difficulty and provide a method for winding the ball which prevents distortion of the ball when doffed, facilitates the application of the band, and produces an improved package of balled yarn. 
     SUMMARY OF THE INVENTION 
     According to the present invention, yarn is balled by winding the same about an expanded arbor by movement of the guide arm in the generally known manner. Prior to completion of the ball winding the guide arm is controlled so that a plurality of radial turns of the yarn are wrapped about the partially completed ball substantially along a diameter in a plane perpendicular to the axis of the arbor. Thereafter the completion of the ball winding is effected. 
     Preferably, the number of radial turns is held small and provides no more than one or two layers, and is thereafter covered by a plurality of layers wound in the figure eight pattern so that it is inconspicuious and not visible from the exterior. 
    
    
     BRIEF DESRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a ball wound in accordance with the prior art, without the band applied; 
     FIG. 2 is a view of a view of a ball partially wound in accordance with the present invention; 
     FIG. 3 is a view of a wound ball in accordance with the present invention showing the radial turns and illustrating the position of the band; 
     FIG. 4 is a front view of a portion of the ball winding machine, illustrating the apparatus for carrying out the present invention, 
     FIG. 5 is a sectional view taken along lines V--V of FIG. 4 and; 
     FIG. 6 is a top plan view of the machine shown in FIG. 4. 
    
    
     DESCRIPTION OF THE INVENTION 
     Turning first to the method of carrying out the present invention, reference is made to FIGS. 4 through 6 which illustrate the aforementioned G &amp; W Maschinen apparatus. The machine basically comprises a plurality of arbors 10 mounted on the machine frame for rotation about its central axis. The arbor is connected directly or indirectly by means of a belt or other transmission to a drive motor 12 and comprises a plurality of parallel members mounted about a central shaft 14, by link means 16 which allow the members to expand and collapse, as required, relative to the central shaft 16. 
     Mounted in front of the arbors is an elongated bracket 18 on which are mounted a plurality (corresponding in number to the arbors) of yarn flyer mechanisms generally depicted by the numeral 20. The flyers 20 are pivotally mounted to the frame of the machine and are movable by a hydraulic motor and/or suitable cam and articulated linkage so that it pivots in an arcuate path transverse to the shaft 16 indicated by the arrow A. The flyer mechanism 20 comprises a spring loaded arm having a yarn guide 24 at its outer end. The arm extends beneath the bracket and is movable perpendicular to the bracket 18 along a path B substantially parallel to the surface of the arbor. 
     It will be observed that the movement along the path A when combined with the movement of the yarn guide 24 along path B, moves the yarn guide both axially and circumferential (at least in part) relative to the arbor in a complex path which causes the yarn to overlap in a constant progressive angle along the length of the arbor. When coupled with the rotation of the arm, the yarn itself is resultantly applied to the arbor, in a substantially wound ball of substantially spherical shape. 
     Mounted to the rear of the arbor is a pusher member, which when actuated moves in a path C causing the finished ball to be doffed from the arbor. Not shown are the creel and feed means for the yarn, cutting means, end tucking means, etc., all of which are found in the aforementioned commercial machine. In addition to the foregoing elements, the commercial machine includes control means for rotating the arbor, and yarn flyers as well as pivoting the flyer support bracket, in a predefined and selectable rate. 
     Once the yarn is doffed, it falls on a conveyor on which it is moved to a banding machine included with or separately from the aforementioned commercial machine. 
     For further details of the machine reference can be made to the commercial machines, which are well known to those skilled in the art, currently available from G &amp; W Maschine. 
     It has been known heretofore, to wind the yarn continuously in overlapping constant angular progression, by rotating the arbor and by pivoting the bracket and flyer in a continuous uninterrupted relationship so that the entire ball is formed in the same figure eight or similarly wound pattern, producing a ball such as shown in FIG. 1. It will be observed that this ball is substantially loose, having an ill defined spherical shape. It is difficult to place a band about such a ball and to maintain integrity of the wind and stability for shipping and handling. 
     In accordance with the present invention, the ball is initially wound on the machine illustrated in conventional manner, until at least one half of the ball size is wound as seen in FIG. 2. At this point, the movement of the flyer 20 is controlled so that it is pivoted to place the tip of the flyer substantially midway between the ends of the arbor. At this point the flyer 20 is held so that the yarn is applied circumferentially about the arbor. This is accomplished by holding the flyer arm stationary and interrupting its movement along path B for a time sufficient to permit the arbor to rotate several times while permitting the flyer 20 to pivot. This results in depositing a band or layer of radially disposed yarns about the central equator of the ball, as seen in FIG. 3. 
     The flyer 20 may be reciprocated one or two times within a very narrow range about the equator to wind more than one layer, if desired; however, it is not necessary to wind more than two or three radial layers. The reciprocation of the bracket should be held in a narrow range so that perhaps no more than 5 to 10 windings or turns are formed in each layer, thus limiting the band of radial turns. 
     After the radial turns are formed, the machine is returned to its normal operation and the progressive angular winding is completed, overlying and hiding the radial windings. Thus the ball wound in accordance with the present invention provides an inner body portion of progressively angled windings, an intermediate radial winding portion and an outer body portion similar to the first portion. 
     After the completed ball is formed, it is doffed from arbor, as seen in FIG. 2 which is an enlarged distortion. The ball when doffed has its spherical shape modified somewhat to assume a peanut shape wherein its central portion, or equator is moderately constricted presumably by the tension of the radial turns. This stabilizes the ball, and permits the band to be more accurately and securely applied about it. The band is either self sealing, heat sealed or with wet glue applied in coventional manner about the equator. 
     The radial turns are made after at least 50% of the ball is completed and preferably between 50-70%. In this manner, the true shape is distorted only slightly and after the band is applied, the natural resiliency of the ball causes the ball to take a more truly spherical shape. In addition, the remaining 30-50% of the winding not only covers the radial portion, hiding it from view, but also reinforces the &#34;ball like&#34; appearance of the ball when doffed. 
     The radial windings or turns can be effected by interrupting the motor or transmission means moving the flyer arm, and limiting the reciprocation of the bracket 18 or by slowing its movement perceptably while increasing the speed of the arbor. Since the winding machines are basically mechanically operated through the use of control cams and drive means, with a minimum of electrical and/or electronic control systems, the inclusion of suitable additional or replacement cams, timing devices, relay motor controls and similar control means can be easily effected and will be known to those skilled in this art. 
     While the present invention has been described with reference to the aforementioned G &amp; W Maschinen Type 204 and 205/305 balling and banding machines, it will be appreciated that its teachings can be employed on other machines and processes. It is therefore intended that the present disclosure be taken as illustrative only and not as limiting of the present invention.