US2745239A

US2745239A - Twist control balloon inclosure

Info

Publication number: US2745239A
Application number: US346893A
Authority: US
Inventors: Chadwick B Kingsbury
Original assignee: North American Rayon Corp
Current assignee: North American Rayon Corp
Priority date: 1953-04-06
Filing date: 1953-04-06
Publication date: 1956-05-15
Anticipated expiration: 1973-05-15

Description

y 5, 1956 c. B. KINGSBURY 2,745,239

TWIST CONTROL BALLOON INCLOSURE Filed April 6, 1953 2 Sheets-Sheet 1 INVENTOR OHADWIOK B. KINGSBURY BY ///f M A ATTORNEYS M y 1956 c. B. KINGSBURY 2,745,239

TWIST CONTROL BALLOON INCLOSURE Filed April 6, 1953 2, Sheets-Sheet 2 FIG.3.

FIG. 4 m

INVENTOR OHADWIGK B. KI NGSBURY United States Patent TWIST CONTROL BALLOON INCLOSURE Chadwick B. Kingsbury, Elizabethton, Tenn., assignor to North American Rayon Corporation, New York, N. Y., a corporation of Delaware Application April 6, 1953, Serial No. 346,893

7 Claims. (Cl. 57-108) This invention relates to yarn twisting machines in general. More particularly, this invention relates to a twist control balloon inclosure for yarn twisting machines especially of the upstroke type.

An object of this invention is to provide a yarn twisting machine having a yarn balloon inclosure adapted to control the application of twist to the yarn.

Another object of this invention is to provide an improved yarn twisting machine adapted for use with relatively high twist heavy denier yarn.

, Still another object of this invention is to provide an improved yarn twisting machine with a balloon inclosure having a spiral-shaped ridge adapted to restrict the balloon and control the application of twist to the yarn.

Still another object of this invention is to provide an improved yarn twisting machine, the structure of the balloon inclosure of the twisting machine being of such nature as to provide zones of twist control throughout the length of the ballooning thread.

In accordance with this invention there is provided an improved yarn twisting machine with a generally cylindrical yarn balloon inclosure. This balloon inclosure is constructed to have a helical ridge with a plurality of convolutions on the internal surface of the inclosure to engage the yarn balloon. The direction of the upwardly spiralling ridge convolutions formed on the inner surface of the balloon inclosure is the same as the direction of rotation of the twisting bobbin which is positioned inside of the inclosure.

During operation of the machine of this invention, the centrifugal force of the yarn balloon holds portions of the balloon intointimate contact with the inner surface of the balloon inclosure. Since the direction of the spiral convolutions is the same as the direction of rotation of the bobbin, and since the pitch of the spiral con volutions within the guard is greater than the rate of rise of the thread in the balloon, the twist being inserted in the balloon is urged upward along the thread. This in effect creates a zone of relatively low twist between the revolving supply bobbin and the first contact point which the balloon makes with the inclosure. As a reice is the fact that if the twist in the zone of the balloon between its point of departure from the revolving bobbin and its first contact with the balloon guard is kept sufficiently low, these imperfections, protruding from the surface of the revolving bobbin, will not be Wound into or otherwise entangled in the ballooning thread.

It is, therefore, an important object of this invention to provide a yarn twisting machine in which the amount of twist can be controlled at various zones in the balloon so that short, loose ends protruding from the yarn surface on the bobbin will not be wound into the yarn leaving the bobbin and thereby be plucked out of the yarn on the bobbin causing more broken filaments. If the ballooning thread is allowed to continue plucking the protruding filaments, the broken filament condition is aggravated to such an extent that a break in the thread will occur.

Referring to the drawings briefly:

Fig. 1 shows a view of this invention in side elevation partially broken away;

Fig. 2 is a sectional View taken along the line 22 of Fig. 1 showing the yarn bobbin and corrugated inclosure;

Fig. 3 is a vertical partially broken away view of th inclosure and bobbin positioned therein, said view being employed for the purpose of facilitating the explanation of the operation of this invention; and

Fig. 4 is a fragmentary sectional view of an upper corner of the inclosure and bobbin showing a modified form of this invention.

Referring to the drawing in detail, there is illustrated in Fig. l a view in side elevation of an embodiment of this invention and reference numeral 10 designates substantially a cylindrical inclosure surrounding the yarn bobbin 11 which is shown in dotted outline. The inclosure 10 is preferably made of sheet metal such as stainless steel and it may be fabricated in any manner to provide the desired shape, including the inwardly protruding spiral convolutions 12. These convolutions are preferably shaped so that the cross-sections thereof are substantially semi-circular, although they may be of other shapes as long as a substantially spiral corrugated surface is provided to the inner surface of the inclosure 10. Such shape may also be provided by soldering or welding a spiral 12b made of a metal rod or tube to the inside of a smooth tubular member.

The bobbin 11 is supported on a spindle not shown and is rotated by means of the whorl 13 that is engaged by suit, a zone of relatively high twist is created in the yarn between the last point of contact which the yarn makes with the balloon inclosure and the gathering eye.

IOn the other hand, if the direction of the upwardly spiralling convolutions is opposite to the direction of rotation of the yarn supply bobbin, the opposite effect is produced. Namely, a zone of higher twist is produced between the supply bobbin and the first point of contact of the yarn with the balloon inclosure and a zone of the belt 14 and is rotatably supported on the flange 15 that is bolted to the structural member 16.

The yarn 17 is fed from the bobbin 11 and balloons out against the spiral convolutions 12 and surfaces of the inclosure 10 between these convolutions as it is drawn upward and passed through the

gathering eyes

18 and 19. The gathering eye 18 is formed in the free end of the rod 20 that is adjustably supported by the member 21. Likewise, the gathering eye 19 is formed in the free end of the rod 22 that is adjustably supported by the member 23. After the yarn 17 passes through the

gathering eyes

18 and 19, it engages the traverse guide 24 that is reciprocated back and forth in a direction parallel to the axis of the take-up bobbin 25 by means of the traverse bar 36.

The periphery of the bobbin 25 contacts the driving roll 26 that is mounted on the driven shaft 27. The roll 26 may be provided with a surface sleeve 28 made of cork or similar material and this sleeve engages the outer layer of yarn wound upon the bobbin 25 during the winding of the yarn on this bobbin. The mechanism supporting the bobbin 25 may consist of a pair of arms such as the arm 29 that is rotatably supported on the shaft 30 and this mechanism may be constructed in the manner disclosed in my co-pending application Serial 3 No. 3221682, "filed "November 26, 1952, to which reference -is "herein "made 'for the details "of construction thereof.

The yarn 17 leaving the bobbin 11 forms a balloon that is restricted by the inclosure 10. The centrifugal force of =the yarn 17 caused bythehigh speed rotation of the-bobbin 11 causes the yarn '17 to hug the inner surface of-the-inclosure 'very closely. This action incombination with the spiral shape of the balloon inclosure has-a 'tendency'to urge the'twistirnparted-to the yarn "by --the rotating'bobbin lL upward along the yarn to the portion thereof between'the lower gathering eye 18 and the 'top convolution 12a because the direction ofthe'spiral convolutions 12 is the same as the direction -of rotation of the bobbin 11. As a result, the lower portion of the ballooning thread between the bobbin-11 and the-lower convolution'lZb is of comparatively lowertwist. This'is illustrated in Fig. '3. The convolutions in the yarnare shown graphically in Fig. 3 at variousportions of the balloon indicating low twist in zone A and resulting high twist in zone'B.

High speed rotation of the bobbin 11 causes all imperfections such as

broken filaments

31, 32 and 33 to protrude radially from the surface of the yarn body. Consequently, there is a tendency for a protruding broken filament, such as the filament 33, coming in contact with the thread ballooning from the bobbin 11 in zone A and to be twisted into the ballooning yarn. Such broken filaments twisted into the ballooning yarn are plucked out of the yarn body of the bobbin and cause further damage, often resulting'in breakage of the ballooning yarn. This tendency is practically eliminated by this invention because, as outlined above, the amount of twist in the ballooning thread in zone A is insuflicient to completely entrap the broken filaments protruding from the yarn body.

As a result, a yarn of substantially improved quality is produced and breakage is minimized by employing the apparatus of this invention. Furthermore, conventional. flyers rotating with the bobbin are unnecessary and disadvantages inherent in such flyers are consequently eliminated.

This invention is not limited in its application to heavy denier yarn such as is employed in tire cord although it finds ready application with such yarns. It may, however, be employed with various yarns wherever high twist is applied to the yarn. In fact, thisinvention has considerable merit in the throwing of light denier yarns made of either continuous filament or staple fiber.

,I, therefore, do not desire to limit this invention to the exact details described and illustrated except insofar as those details are set forth in the claims.

I claim:

1. A'yarn twisting machine for placing a substantial numberof twists into the yarn per inch of yarn length comprising a yarn bobbin, means for rotating said bobbin to apply twist to the yarn as the yarn is being removed from said bobbin, and rigid means engaging the yarn for urging the twist existing therein away from the portion of the yarn immediately adjacent tosaidbobbin so that said portion of the yarn does not tend to wrap thereinto the loose yarn filaments projected from said bobbin by the centrifugal action of therotating bobbin.

2. Ayarn twisting machine for placing a substantial number of twists into the yarn per inch of yarn length comprising a yarn bobbin, means for rotating said bobbin to apply twist to the yarn 'as the-yarn is being removed from said bobbin, and a rigid spiral shaped member for engaging the yarn and for urging the twist existing therein away from the portion of the yarn immediately adjacent to said bobbin so that said portion of'the yarn does not tendto wrap thereintotheloose yarn filaments projected from said bobbin by the centrifugal action of "the "rotating bobbin.

3. A yarn twisting machine for placing a substantial number of twists into the yarn per inch of yarn length comprising a yarn bobbin, means for rotating said bobbin to apply twist to the yarn as the yarn is being removed from said bobbin, and a rigid cylindrical member surrounding said bobbin, said cylindrical member having means engaging the yarn for urgingthetwist existing therein away from the portion-of the 'yarn immediately adjacent to said bobbin so that-said portion-ofthe yarn does not tend to wrap thereinto the loose yarn'filaments projected from said bobbin by the centrifugal action of the rotating bobbin.

4. A yarn twisting machine for placing a substantial number of twists into'the yarn per inch of yarn length comprising a yarn bobbin, means for rotating said bobbin to apply twist to the yarn as the yarn is being removed from said bobbin, and a rigid cylindrical member surrounding said bobbin, said cylindrical member having a'spiral shaped ridge formed therein for engaging the yarn and for urging the twist existingtherein away from the portion of the yarn immediately adjacent to said bobbin so that said portion of the yarn does not tend to wrap thereinto the loose yarn filaments projected from said bobbin by the centrifugal action'of the rotating bobbin. I

5. A yarn twisting machine comprising a yarn bobbin, means for rotating said bobbin forimparting a substantial number of twists per inch of length of said yarn, yarn take-up means for receiving the yarn removedfrom said rotatable bobbin and rigid means for engaging the yarn balloon formed by the yarn thrown from said bobbin, said last-mentioned means having means for controlling the twist existing indifferent sections of the yarn in said balloon so that the yarn as it leaves said bobbin is subjected to relatively low twist so as substantially'to prevent the yarn from twisting brokenfilaments protruding from said bobbin into'the yarn as it leaves saidbobbin.

6. A yarn twisting machine comprising a yarn bobbin, means for rotating said bobbin for imparting a substantial number of twists per inch of length of said yarn, yarn'take-up means for receiving the yarn removed from said rotatable bobbin and a'rigid inclosure for engaging the yarn balloon formed by the yarn thrown from said bobbin, said inclosure surrounding said bobbin-and'being coaxial therewith, said inclosure having means for controlling the twist existing in difierent zonesof the yarn in said balloon so that the yarn as it leaves'said bobbin is subjected to relatively low twist was substantially to prevent the yarn from twisting broken filaments-protruding from said bobbin into the yarn as it'leaves said bobbin.

7. A yarn twisting machine comprising a yarnbobbin, means for rotating said bobbin for imparting a substantial number of twists per inch of length of said yarn, yarn take-up means for receiving the yarn removed from said rotatable bobbin and means for restricting the yarn balloon formed by the yarn thrown from said bobbin, said last-mentioned means having a spiral shaped ridge for engaging said yarn balloon and 'for controlling the twist existing in different zones of the yarn in said'bobbin, the direction of the spiral in said ridge being the same as the direction of rotation of said bobbin so that the portion of the yarn immediately as it leaves said bobbin is subjected to relatively low twist.

References Cited in the file of this patent UNITED STATES PATENTS 2,660,856 Kingsbury Dec. 1, 1953 FOREIGN PATENTS 507,93 8 Germany :Sept. .22, "19.3.0