US2584640A

US2584640A - Textile drawing roll

Info

Publication number: US2584640A
Application number: US181340A
Authority: US
Inventors: Merton W Taylor
Original assignee: Saco Lowell Shops
Current assignee: Saco Lowell Shops
Priority date: 1950-08-25
Filing date: 1950-08-25
Publication date: 1952-02-05
Anticipated expiration: 1969-02-05

Description

Patented Feb. 5, 1952 TEXTILE DRAWING ROLL Merton W. Taylor, Kennebunk Beach, Maine, as-

signor to Saco-Lowell Shops, Boston, Mass., a

corporation of Maine Application August 25, 1950, Serial No. 181,340

This invention relates to textile drawing rolls. such as are commonly used in spinning, roving and other similar textile machines, and more particularly to a coupling for the sections of such rolls.

Textile drawing rolls are built up to a desired length by, joining successive sections together, and are frequently as much as forty feet or more in total length. The accuracy and uniformity with which such rolls are made has a definite effect on the quality of the yarn produced, particularly in the modern high-draft systems, since any eccentricity or runout of the rolls will cause varying conditions which undesirably affect the drafting and thus the uniformity of the sliver being drafted. To reduce such eccentricity or runout and produce a roll of sufficient straightness for use in modern high draft systems requires a considerable amount of straightening.

The screw joint for the sections of textile drawing rolls is practically in universal use today. The internal part of the joint has an accurately bored hole, followed by a conventional internal thread. The mating part has a conventional thread followed by a cylindrical por tion that fits tightly in said accurately bored hole,

the cylindrical portion being pulled tightly into place by the screw thread. It is diflicult, how ever, to tap an internal thread and have the axis of the thread in line with the axis of the roll section with any degree of accuracy, thus, after assembling a screw joint of the conventional type. during the required straightening operation a very high stress is set up in the screw due to the bending of the male thread trying to aline itself with the mis-alined female thread. Such condition produces an excessive bend in the roll at the joint, requiring considerable straightening of the final length of the roll in order to obtain a usable roll, and an even greater amount in order to produce a roll straight enough for use with modern high draft systems.

The object of my invention is to eliminate or greatly reduce the above mentioned stress, thus eliminating or greatly reducing the amount of necessary straightening and producing a more accurate textile drawing roll which is particularly suitable for use with modern high draft systems in which an accurate drawing roll is essential.

Apreferred form of my invention is shown in the drawing, in which:

Fig. 1' is a side elevation of a portion of a textile drawing roll, partly in section, embodying my invention;

Fig. 2 is aside elevation of a portion of a textile drawing roll, partly insection, embodying a modified form of my invention; and

Fig. 3 is a side elevation of a portion of a textile drawing roll, mostly in section, embodying still another modified form of my invention.

Referring to Fig. l, I have shown end portions of a pair of drawing roll sections, generally indi- 4 Claims. (01. 19141) cated at I2 and I4, adapted to be assembled with other similar sections to build up a drawing roll of any desired length. The drawing roll section I2 is provided with an axially alined recess in one end thereof, said recess having a smooth portion I 6 adjacent the end of said section I2. The smooth portion I6 may be either slightly tapered, as shown, or of cylindrical shape as may be de sired. An inner threaded portion It! is provided in said recess adjacent said smooth portion I6, said inner threaded portion having threads formed in a substantially cylindrical bored hole as is conventional. The roll section I4 has an axially alined male threaded portion 25 adjacent the end thereof, and an inner smooth portion 24 adapted to fit closely into smooth portion It on roll section I2. The threaded portion 26 has threads formed on a tapered cylindrical surface, the diameter of said threaded portion 26 being greater at the end of roll section I4 (the left end as shown in Fig. 1) than at the end of said threaded portion 26 adjacent the smooth portion 24, thus producing a back taper on said threaded portion 26, the larger diameter of said threaded portion 26 being adapted to fit closely into threaded portion I8 on roll section I 2.

When roll sections I2 and I4 are assembled by screwing the threaded portion 26 of roll section I 4 into the threaded portion I8 of roll section I2, the accurately fitting smooth portions I 6 and 24 will act to aline the roll sections I2 and I4, while the tapered threaded portion 26 of roll section I4 and the threaded portion I8 of roll section I2 will retain the roll sections in closely adjacent assembled relation. The tapered threaded portion 26 and the internally threaded portion I8 have substantially greater clearance on the diameter at the end adjacent the smooth portions I6 and 24 than at the other end, thus the closely fitting smooth portions will aline the roll sections, while the clearance between said threaded portions adjacent said smooth portions will allow such alinement without setting up high stresses in the joint, since the clearance allows the bend of the threaded portion 26 to be distributed over the major portion of the,

length of said threaded portion. I prefer that the clearance on the diameter be between 0.005 and 0.05 inch per inch of length, and within such range preferably about 0.01 inch per inch of length, since such taper is great enough to allow alinement but still leaves a considerable portion of the threads of roll section I4 in position to be gripped by the threads of roll section !2, though obviously a greater or lesser degree of taper may be used without departing from the spirit of my invention.

In order to provide a means for predetermining the lengths of the finished roll, roll sections I2 and It may be provided with opposing

shoulders

28 and 30 respectively, said shoulders abutting when the roll sections I 2 and I4 are assufiicient taper to similarly provide ameans for predetermining the length of the finished roll. The clearance between the threaded portions of the roll sections may also be provided by tapering the female threaded portion of the recess in roll section l2 as shown in Fig, 2. In this modification of my invention, in which corresponding parts have been numbered similarly to Fig. 1, the roll section I? is provided with an axially alined recess having a' smooth portion 161" adjacent the. end; of said section [2. An, inner threaded portion 32 is provided in said recess. adjacent the. smooth portion It, said female threaded portion, 32 being tapered, with the larger. diameter of said threaded portion; 32 adjacent the smooth portion 6.

The adjoining roll section M- has antaxialli alined threaded; portion 34 adjacent: the. end

thereof, and inner-smooth portion is adjaeg;

centsaid threaded portion. The male threaded portion at has straight threads of: uniform" diameter adapted to fit, intothe minimum diameter of thetaper-threaded'portion 32, so that,

when roll-section M is screwed into the tapered 1 threaded portion 32 of roll-section i2, a clear-= ance is thuszprovidedat the end of saidthreadecl f' pered as to provide a clearance adjacent the smooth aliningportions of the roll joint while at the same time providing the necessary grip to. retain the roll sections in closely adjacent assembled relation.

In Fig. 3 I have shown a still further-modification of my invention, in which two similar roll sections I2. are coupled by-a bearingsection 35; said bearing section being provided at each end with a shoulder 38* adapted to. fit against shoulder 290i roll section t2; a smooth portion Ml adapted. to fit the smooth portion iii of the roll section t2, and a threaded portion I 42; shown as a back tapered thread similar to threaded portion 26 of Fig. 1, though of course the means of Fig. 2 maybeemployed. Such back tapered thread 42- is adapted'to fit into the internally threaded-portion it of roll section l2 as hereinbefore explained. By such an arrangement I am enabled to replace roll sections as they become worn, without any change in the length of the finished roll, and with little or no required straightening of the roll after replacing such bearing section; since my novel roll coupling and'alinin means greatly reduces the stress at such roll joint.

It will'be understood'from the above description that various expedients maybe resorted to in order to provide clearance between the taperedportions adjacent the straight alining portions which characterize my novel textile drawing roll, and I do not Wish to be understood as limiting my invention to the details disclosed, except as set forth in the appended claims;

I claim:

1. In a textile drawing roll having a plurality of roll sections; coupling means for said sections including anaxially alined recess having an internally threaded portion in one of said sections and an axially alined externally threaded portion on an adjacent section adapted to;be retained by said internally threaded portion on said first section, said threaded portions having substantially greater clearance at the end adjacent the end of said first section than at the end away from the end or" said first section, whereby the sections of said roll are easily alined.

2. In a textile drawing roll having a plurality of roll sections; means predetermining the length of said drawing roll, coupling means for said sections including an axially alined recess in one of said sections having an internally threaded portion, and an axially'alined' memher on an adjacent section having an externally threaded portion adapted to be retained by" said internally threaded portion on said first section, said threaded portions having substantially greater clearance at the end adjacent the end of said first sectionthan at the end'away from the end of said first section, whereby the sections of said roll are easily alined.

3. In a textile drawing roll having a plurality of roll sections; alining and coupling. means for said sections including an axially alined recess in one of said sections having a smooth portion adjacent the end of said' section and an internally threaded portion adjacent said smooth portion; an axially alined? externally threaded portion on an adjoining second section adjacent the end" thereof adapted to be retained by said internally threaded portion, and an axially alined" smooth portion on said second section adjacent said externally threaded portion closely fitting the smooth portion of said first section, said threaded'portions having substantially greater clearance at the end ad'- jacent said smooth portions than at the end away from said smooth portions, whereby said sections are easily alined by said smooth portions.

4. In a textile drawing roll having a plurality of roll sections; means predetermining the length of said drawing roll; alining and coupling means for said sections including an axially alined recess in one ofsaid sections having a smooth portion adjacent the end of said section and an internally threaded portion adjacent said smooth portion, and an axially alined externally threaded" portion on an adjoining second section adjacent the endthereof adapted to be retained by said internally threaded portion, and an axially alined smooth portion on said second section adjacent said externally threaded portion clbsely fitting the smooth portion of said first section, said threaded portions havingsubstantially greater clearance at the end" adjacent said smooth portions than at the end away from sai'd smooth portions, whereby said sections are easily alined by said smooth portions;

MERTON WT TAYLOR.

REFERENCES CITED:

The following references are of record in the file of this patent: