US2303912A - Twister spindle - Google Patents

Description

Patented Dec. 1, 1942 TWISTER SPINDLE Theodore M. Cole, Waynesboro, Va., assigner ,to

E. I. du Pont de Nemours & Company. Wilmington, Del., a corporation of Delaware Application July a 1941, serial No. 401,006 ,y

sciaims. (el. 57-129) This invention relates to method and means for reconditioning worn twister spindles of downtwisting machines.

Down-twisting machines such as ring twisters are commonly used for twisting textile yarns, and

to increase productivity of the machine and to reduce operating costs the spindles supporting the bobbin on which the yarn is wound are rotated at high speeds and relatively large packages of twisted yarn produced. If the twister bobbin or pim is carefully balanced and hushed precisely y to just lit the spindle on whichit is to be used so that thereis substantially no freedom of motion between the bobbin and the spindle, the spindle can be` used for a long period of time without excessive Wear. However, in a textile plant equipped with tens of thousands of twister spindles and many more twister bobbins, it is impossible to keep all the spindles of the same uniform diameter, the bobbins statically and dynamically balanced and the bushings within the bobbins of sumcient precise bore to properly fit any spindle on which they may be put. As aterially helps in lengthening the useful life of the twister spindle. However, in spite of these and other improvements in this field, spindles generally become so badly worn within sixmonths from their initial installation that they have had to be-replaced by new spindles. This is, of course, costly in replacement materials, in labor and, most important, in loss of time and production of the twisting plant.

It is, therefore, an object of this invention to provide a simple and quick method for salvas and reconditioning worn twister spindles whereby their life is prolonged several times over their initial useful period. A further object is in the provision of simple, economical'means forrecon ditioning and prolonging the lifey of twister spindles on downV twister machines. Other objects of this invention will be apparent from the description that follows.

which will be describedin connection with me accompanying drawing wherein:

Fig. 1 is an elevation of a twister spindle and the supported bobbin, parts of which are cut away to show the areas of contact;

Fig. 2 is a view similar to Fig.A l showing the twister spindle improved inv accordance with a preferred form of my invention;

Fig. 3 is a cross-section, somewhat enlarged. on the line 33'of Fig. 2;

Fig. 4 is a detail sketch of-a split sleeve; and

Fig. 5 is a detail of a portion ci the spindle recessed accordingl to my invention.

Referring to Fig. 1, I is the twister spindle the spindle, unbalance of the bobbin, ete.

fitted the contracting spring sleeve S shown in lt is necessary that there be a good Fig. tight fit between the inner surface oi the split sleeve and the prepared section of the spindle and that the outer surface of the sleeve when it is sprung in place on the prepared section of the spindle is uniformly flush all the way around` with the rest of the spindle above and below this area, as shown in Fig. 2.

"rc further inustrate this invention, a wom the twoprepared portions will. each be 0.458-

The machining or grinding inch in diameter. may be done with suitable jigs and fixtures so These objects are lrealized by my invention 55 as izo-maintain concentricity of these prepared areas. The split sleeves are prepared, for example, from spring steel stock 0.019 inch in thickness, then plated on the outside 'surface with chromium to the extent of 0.002 inch in thickness. In this way, the split sleeves having a total thickness of 0.021 inch just completely ll the spaces prepared for them on the spindle. The split sleeves are expanded over the spindle and slid in place and, due to the tendency of the material to contract and form a closed cylinder, tightly hug the prepared areas of the spindle. If the preparation of the spindle and the manufacture of the split sleeves are carefully carried out, the sleeves will be held in place by frictional contact with the undercut portions of the spindle and the outer surface of the split sleeve will be just flush with the adjacent unworn portions oi the spindle.

Spindles thus reconditioned have been found to resist wear exceptionally well and may be originally were in operation. Even after this extended period of continued use, a further reconditioning requires only Areplacement of the worn split sleeves with the new pair of split sleeves.

It is understood, of course, that the above description is by way of illustration only and that my invention is not limited to the exact material and conditions described, but is susceptible rather to wide variation. Thus, while a chromium plated split sleeve is preferred due to the desirable hard wearing surface of chromium, plain steel sleeves made of the proper thickness may also be used. 'Ihe life of the plain steel sleeve will, of course, be considerably less as compared to the chromium plated sleeve, but the costof their preparation is much less and in some instances, their use may be justified. Furthermore, instead of plating the steel sleeves with chromium, the, plating metal may be of another material such as nickel. Instead of using spring steel sleeves any suitable hard wearing metal or metal alloy may be used providing it has suillcient springiness to clamp tightly around the cut-a-way portion of the spindle.

In some cases where the spindle wear is reiatively small, for instance, where the maxim depth of wear is not over 0.008 inch and pre for instance of the order of 0.020 inch, the

amount of chromium plating becomes excessive.

and cannot be justified as a practicalv solution. Furthermore, when chromium is plated directly on the spindle rather than to the split sleeve, a subsequent reconditioning of the spindle cannot be so simply and easily carried. out as is the case when my preferred method and means are employed. i

By means of this invention, it has been found possible to recondition thousands of spindles which were heretofore thought worthless, but this invention does more than provide a method of reconditioning a spindle so that it is substantially as good as when it was new for spindles reconditioned in accordance with Vthe preferred embodiment of this invention are vastly improved as compared with new unused spindles. Not only is the second useful period of their life several times the length of the first period, but because the period of wear is greatly increased, the quality of yarn prepared on twisting machines equipped with these spindles is improved. Furthermore, lwhen it becomes necessary to replace a set of .worn split sleeves, they can be quickly removed and a new set substituted in their place at very little effort and at low cost.

I claim: l

1. In a down-twistermachine for twisting and winding yarn, the improvement which comprises a bobbin supporting spindle said spindle being recessed throughout the area of itsvsurface normally contacting the bobbin, the recessed area being covered by a sleeve of wear-resistant material.

2. In a down-twister machine for twisting and winding yarn, the improvement which comprises a bobbin supporting spindle said spindle being recessed throughout the area of its curved surface normally contacting the bobbin, and the recessed area being covered by a sleeve of wearresistant material, said sleeve having a thickness equal to the depth of the recess. g

3. Ina down-twister machine for twisting and winding yarn, the improvement which comprises a bobbin supporting spindle recessed throughout and which sleeves tend to contract whereby to form a close fit with the spindle and to form a substantially unbroken surface with the nonrecessed surface of the spindle.

THEODORE M. COLE.

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