US2635019A - Molded rubber bushing for yarn twisting spindle mechanism - Google Patents

Description

April 14, 1953 J, K, COCHR 2,635,019-

MOLDED RUBBER BUSHING FOR YARN TWISTING SPEENDLE MECHANISMS Filed Oct. 5, 1948 INVENTOR JOHN K. COCHRAN ATTORNEYS Patented Apr. 14, #1953 MOLDED RUBBER BUSHING roa YARN 'rwrs'rmq SPINDLE MECHANISM 7 John K. Cochran, Conyngham, Pa., assignor to The Duplan Corporation, Hazleton, Pa., a corporation of Delaware Application October 5, 1948, Serial No. 152,936

This invention relates to the spinning and twisting of textile yarns and particularly to the bearing supporting bushing in the spindle assembly used therefor. V

In spinning and twisting textile yarns, particularly in imparting double twist to textile yarns strands, a hollowed spindle is used through which the strand of yarn passes in an over end relationship. The yarn is emitted from the lower end of the spindle and thence passes upwardly we takeup reel located above the spindle. The.

' commercial assembly normally comprises a cylindrical support for the supply spool within which the double'twist spindle rotates at high speed, the yarn package and its cylindrical support remaining relatively stationary.

Such a structure necessitates, of course, the use ofs'uitable bearings. The inner race of the bearings is firmly attached to the spindle which is rotatable" while the outer race of the bearings is firmly attached to a bushing which is one of the relatively stationary parts. A metal bush-'- ing may be machined and it will be apparent that such machining necessitated very close tolerances. The bushing must constitute a sufficiently firm support'to prevent the outer race from rotating while at the same time it must not exert an excessive inward pressure on the bearing since such pressure would distort and deleteriously affect the operation of the bearing. Close tolerance manufacture of the bushing, of course, greatly increases the cost of the assembly. Furthermore, close tolerances are not required inflthe remaining parts of the assembly. The requirements of such a bushing constitute a problem in the industry.

Therefore, it is'the object of this invention to provide new and improved apparatus for supporting the bearings in a textile yarn spindle assembly.

Other objects will be apparent after a study :of the following description, claim and drawings, in which- Figure 1 is a. side elevational view of a complete spindle assembly with portions thereof partially cut away and in cross-section to illustrate the invention within the assembly; and

Figure 2 is a sectional view through 22 of Figure 1.

A complete yarn twisting spindle assembly is illustrated in Figure 1 except that the yarn supply spool and the takeup spool are not shown. The cylindrical tube I2 comprises the supply spool support. The yarn passes downwardly through the upperportion of the cylindrical member I2 and through the hollowed spindle II lClaim. (01. 308-184) and is emitted at the lower portion of the spindle:

normally at the storage ring I3. The storage ring I3 together with the yarn guide disc I4 arefirmly attached to the spindle so as to'be rotat-- abletherewith. The spindle II rotates at high. speed while the cylindrical tube member I2 re'- mains relatively stationary.

Normally two bearings are provided for supporting the cylindrical tube I2 and its associated parts on the rotatable spindle I I. Other bearings. might be used if desired. An upper bearing 2I,: which may be either ball bearing or roller bear ings, isprovided between the upper end of the shank 22 of the spindle II and the bushing 23'. mounted within the cylindrical tube I2 for the The inner purpose of supporting the bearings. race 24 of the bearing is firmly attached'to the shank 22 of the spindle II. The outer-race 25 of the bearing is firmly supported by the bushing.

Like the upper bearing 2I the lower bearing 32 may be roller or ball bearing as desired. The inner race 34 is firmly attached to shank 22 of spindle II and the outer race 35 is attached to bushing 23.

Conical grease retainers 31 and 38 may be provided, respectively, for the upper spindle 2I and the lower spindle 3 I, as desired.

The bushing 23 is cylindrical with the outer diameter thereof conforming to the inner diameter of the supporting tube I2. The particular shape or form of the bushing is not critical and may be varied as desired. There is an opening in the upper end of the bushing for the shank 22 of the spindle I I. Preferably the lower end of the bushing 23 is arranged so as to extend beneath the lower edge of the cylindrical supporting tube I2 to some extent and thus provide a more secure mounting. The bushing 23 may be keyed to the supporting tube l2 by one or more radial projections M from the outer surface of the cylinder. A complementary opening is provided in the cylindrical tube I2 to receive the projection 4|.

It is apparent that, unless the bushing 23, if it were metal, were to be machined accurately with 'close tolerances, either undue and distorting pressure on the hearings or slippage of the bearings would result. In either instance the bearings would not operate satisfactorily. In accordance with this invention there is provided a molded rubber .bushing. In the interior and upper end of the bushing 23 a suitable shoulder is provided against which the outer race of the bearing 2| abuts. A second shoulder is provided at the lower 3 end of the bushing for location of the lower hearing 3|. The outer diameter of the bushing 23 conforms generally to the inner diameter of the cylindrical tube I2 with a resulting close or presporting the bearings 2! and 3 I. If the pressure istoo great for the bearings, it is; taken up by the" resilient inherent characteristics of the, molded rubber bushing. Thus there is sufficient pressure to retain the outer race of the bearings in station-- ary position while at the same time theresiliency of the bushing prevents the pressure from being excessive so that there is no undue or distorting pressure on the bearing which will prevent proper operation thereof. The outer race of thebearing is prevented from rotating. Because of the resilience of the' bushinggit "need not be maintained to close tolerances" in production. With this arrangementeach of the bearings 21 and 3| is retained firmly but: gently in position. The rubber bushing should beoil resisting in view of the presenceof oil and grease for the rotating metal parts.

Thisarrangement of amolded rubber bushing for the. bearings ofa rotatable spindle in a yarn twisting assembly has proved to be a. satisfactory solution to the bearing. supporting problem. While the preferred embodiment has been illustrated: and.v described, it will be apparent to those skilled in the art that modifications are possible without; departing from the scope of the invention.

What is claimed is;

Apparatus for spinning and twisting textile yarns comprising a rotatable spindle coaxilly mounted within a relatively stationary cylindrical member, a. molded rubber cylindrical bushing positioned ,coa-xially' between said spindle and said cylindrical member, the outer diameter of said bushing conforming to the inner diameter of said cylindrical member forming an inner lining therefor, the inner diameter of said bushing being greater than the outer diameter of said spindle, the longitudinal length of saidbushing being more than half the longitudinal-length of said spindle and less than the longitudinal length of said cylindrical member, the lower edge of said bushing extending beyond and beneath the lower end of said cylindrical member, said bushing havinganop'ening in the upper end thereof for said spindle, a. radial. projection from the outer surface ofisaidbushing extending into a complementary opening in said'cylindrical member to retain said bushing in position, preventing relative rotation between said bushing and said cylindrical memher, the inner surface of said bushing having a first annular supporting surface near the upper end thereof with a shoulder along the edge of said surface, a second'annularsup'porting surface near the lower end ofsaid bushing andwith a shoulder along the edge thereof, a first unitary bearing structure having an inner race and an outer race mounted within said bushing and retained by'annular resilient pressure of one of said supporting surfaces against said outer race, and asecond unitary bearing structure having an inner race and an outer race mounted within said bushing near. the other end thereof and; retained by annular pressure on the other of said supporting surfaces against the second said outerrace'.

JOHN COCHRAN.

References Cited in the. file or this patent UNITED STATES PATENTS Number Name Date 2,044,392 Lord s June 16, 1936 2,149,122 McCal1- s Feb. 28, 1939 2,201,477 Chamberlain May'2l, 1940 2,261,823 Ballard l Nov.-4, 1941

Images