US2599256A

US2599256A - Yarn twisting machine

Info

Publication number: US2599256A
Application number: US220412A
Authority: US
Inventors: Jack K Hartley; Vernon F West; Thomas E Edwards
Original assignee: Courtaulds PLC
Current assignee: Akzo Nobel UK PLC
Priority date: 1950-05-19
Filing date: 1951-04-11
Publication date: 1952-06-03
Anticipated expiration: 1969-06-03

Description

June 1952 J. K. HARTLEY ETAL 2,599,256

YARN TWISTING MACHINE Filed April 11, 1951 v 2 SHEETS-SHEET 1 //V VE N T 01% Jack Kennel/r Hartley Vernon Fosbraak Wes! Thomas Edward Edwards By their a/farneys w/Mu J 3, 1952 J. K. HARTLEY El'AL YARN TWISTING MACHINE g Sl-IEETS-SHEET 2 Filed April 11, 1951 ynvavrons 4 Jack Kenneth Hartley Vernon Fosbroo/r West Tnomasfdwordfdwards By their alforneys Patented June 3, 1952 Nurse stares YARN; 'EWISTING MAQHINE Application April. 11, 1951', serarno. 220,412.

In Great Britain May 19', 1950 4' Claims. 1

This invention relates to yarn twisting machines and in particular to such" machines having double-twist spindles.

The customary form of double-twist spindle includes a carrier ifOI' a yarn holder such as a bobbin from which the" yarn: to be twisted is withdrawn, a hollow live spindle on which the bobbin carrier is freely mounted anddown through which the yarn on withdrawal from the bobbin is passed, and a. rotating cup which surrounds the lower end of the bobbin carrier and below which the yarn. is withdrawn. from inside the hollow spindle and. is. then passed asa balloon to a separate yarn collector. It is customary, but not essential, to provide a rotatable: flyer at the top of the bobbin. so that. the yarn is passed from the bobbin, through the fl'yer and then into the hollow spindle.

In such double-twist spindles it is necessary to maintain the carrier stationary during. normal operations. In one type of spindle, the: spindle is canted and a weight, for. example of lead; is eccentrically mounted within the carrier. This method is not entirely satisfactory since parts" of the spindle are not readily accessible and, should abnormal conditions arise causing the carrier to rotate, the high speeds and weights involved render such rotation dangerous as parts may fly 0i and cause damage to: operatives and neighbouring machinery. In United States patent specification No. 2,482,654 it has been proposed to obviate this diiiiculty' by causing both' the double-twist. spindle and" the take-up spool to stop automatically when the carrier rotates; the rotation of the carrier causing a coil spring to be thrown by centrifugal force into the ballooning yarn and so breaking the yarn and operating mechanism whereby thed'oubl'e-twist spindle slides away from. its driving belt and the take-up spool is lifted from its driving-wheel".

It is also known to mount. the double-twist spindle vertically and to maintain the carrier stationary by electrically or magnetically con-- trolled devices. With such vertical spindles it is also known, see for example. British, patent specifications Nos. 299,860 and 590,182; to use" the controlled device to operate a stop mechanism should the carrier be caused to rotate.

When the yarn in a doubletwisting machine breaks, either as aresult of the carrier rotating or for any other reason, the continued rotation of either the double-twist-spindle' or the .collect ing device, or both, causes the broken yarn to; lap round moving parts; of the.machimi:v consciquently it usually takes a. long: time-z'iorthe: open- 2 ator to locate and unravel the broken ends and piece them up: preparatory to restarting the machine.

The object of the present invention is to ex. pedite the piecing-up operation with vertical double-twist spindles.

According to the present invention, a yarn twisting machine comprises a double-twist spindlepivoted at its lower end' and somounted that when free it falls forward into a non-operativeposition, a collector for the twisted yarn, a yarn break detector, and catch mechanism for holding the double-twist spindle in a vertical driving position and releasing it at the instigation of the yarn break detector. In accordance with the invention, the yarn break detector. may also initiate the release of the yarn collector from its drive.

In a preferred form of machine according to the invention, the yarn collector comprises a; pivoted cradle forholdinga cheese or like package which is surface driven. by a driving roller and the yarn break detector comprises a. floating lappet pivoted on the front. of the cradle and provided with a member which. on the release of the lappet. cooperates. with a cam on the" shaft of the driving roller to raise the front of the cradle and. in so doing to release the cheese or the like from the driving roller and also to re- 1 lease the catch of the double-twist spindle which latter consequently falls forward into the nonoperative position. Thus, as v the. cradles rises, its rear end may depress one arm. of a. see-saw the other arm of which carries one end. of a I Bowd'en wire operatively connected to the catch holding, the double-twist. spindle in, the vertical driving position. Alternatively the catch of' the. double-twist spindle may be. released by means of a solenoid. which. is energised through the movement of. the floating lappet on yarn breakage.

The machine according. to theinvention may also include a snap catch. for holding the. cradle in the inoperative position, a. readily accessible release handle. being provided for. use in re-v starting.

In order to stop the cam. on the. shaft of. the driving roller. continualy knocking the cooperating member of. the floating lappet. after the cradle has been lifted, the lappet is. preferably automatically swung overto an idleposition once the double-twist spindle has been released; This maybe eliected by fitting. on. the lappet. a bell cranklever onearm of: which. carries abalance-weight, such that.- when: the I lappet. is released and its member comes into contact with the cam, the weighted arm of the bell-crank lever moves and compresses a leaf spring and once the cradle has been raised and the cam is no longer in contact with the member, the tension in the leaf spring is released and causes the lappet to swing over and move the lappet member out of the way of the still rotating cam.

In the machine according to the invention, the carrier is preferably held stationary by means of the magnetic control, preferably of the type described and claimed in the specification of British application No. 21,392/49, so that when the carrier rotates under abnormal conditions, a member of magnetic or magnetisable material is drawn by a magnet within the cup into the ballooning yarn so that the yarn is broken and the catch mechanism for the double-twist spindle is released.

A machine constructed according to the invention is illustrated by way of example in the accompanying drawings in which:

Figure 1 is a front elevation of a double-twist spindle and a collecting device,

Figure 2 is a side elevation of the double-twist spindle and the collecting device shown in Figure 1,

Figures 3 to 6 are diagrammatical representations of various positions of the mechanism for releasing the collecting device and the doubletwist spindle from their respective drives, Figure 3 showing the operative position, Figure 4 showing the position when releasing is about to be initiated, Figure 5 showing the cradle of the collecting device in the lifted position and Figure 6 showing the final inoperative position,

Figure '7 is a plan view of the release catch for the double-twist spindle, and

Figure 8 is a side elevation of the double-twist spindle in the inoperative position.

Referring to Figures 1 and 2, a yarn l drawn from a bobbin 2 passes through a yarn tensioning device 3 and down a hollow spindle 4 on which the bobbin 2 is freely mounted; the yarn I then passes from the hollow spindle 4 into a threadstorage groove 5 and as a balloon B to a pigtail guide I mounted centrally above the spindle 4. From the pigtail guide I the yarn 1 passes over a horizontal glass rod 8 and thence horizontally to a traversing guide 9 which winds it on a cheese lb. The cheese If] is held within a pivoted cradle l I such that it is normally kept in contact with a drive roll l2 by its own weight.

A floating lappet generally indicated at l3 and conveniently made of round wire, in the form of a bell-crank lever is pivoted at its angle to the cradle H and has a short arm I4, recessed at its end, and a long arm 15. A second arm [6 similar to the arm I5 is pivoted to the cradle H at the other end of the cheese l0 and a horizontal wire I! between the ends of the arms l5, I6 is normally supported by the yarn l as it passes from the glass rod 8 to the traversing guide 9. An adjustable balance weight l8 sliding on a bar l9 fixed to the second arm I6 to form a bell-crank lever is adjusted so that the pressure of the wire I! on the yarn I is a minimum.

The double-twist spindle is mounted on a cradle 28 about a pivot 29 and is normally held vertical by means of a catch 21. In the vertical position, a driving belt 30 is in contact with a wharl 3| and a horse shoe magnet 32 is mounted on the cradle 28 with its poles in opposition to the poles of a similar magnet (not shown) within the bobbin carrier of the spindle to prevent the bobbin 2 from rotating during normal operations.

If the yarn I should break, the wire H is no longer supported by the yarn l as shown in Figure 3 and the lappet l3 swings in an anti-clockwise direction to initiate the stop mechanism as follows:

The short arm 14 falls into the path of a cam 20 fixed to the end of the driving shaft of the drive roll [2 (Figure 4) so that a lug 2| on the cam 20 forces the arm I4 upwards and consequently causes the cheese in to be lifted away from the drive roll l2 until the cradle ll, moving about its pivot I IA, is held at its right-hand end by a catch 22. The cheese ll] remains out of contact with the drive roll l2 until the catch 22 is released manually by a lever 23 (Figure 2). As the cradle II is lifted it depresses one end of a see-saw rod 24 which is pivoted at its middle and is attached to a Bowden cable 25 at its other end. The Bowden cable 25 is connected to the catch 21 and when the see-saw rod 24 is tilted (Figure 5) the catch 21 is released against a spring 21A (Figure 7). When the catch 21 is released the cradle 28 is also released so that the spindle falls forward about the pivot 29,'away from the driving belt 30 until the wharl 3| comes into contact with a brake shoe 33 (Figure 8).

When the lappet l3 falls, the bar 19 comes into contact with a leaf spring 26 which is compressed as the cradle l l is lifted. As soon as the short arm I4 is released by the cam lug 2|, the leaf spring 26 flicks the bar l9 and the lappet l3 in a clockwise direction to the position shown in Figure 6 so that further contact of the arm M with the cam 20 is prevented until the mechanism is reset. The double-twist spindle is reset by a handle 34 mounted on the cradle 28, the cradle 28 being centrally held about its pivot by two centering springs 28A.

What we claim is:

l. A yarn twisting machine comprising a double twist spindle pivoted at its lower end and so mounted that when free it falls forward to a non-operative position, a collector for the twisted yarn, a yarn break detector and catch mechanism for holding the double twist spindle in a vertical driving position and releasing it at the instigation of the yarn break detector.

2. A yarn twisting machine comprising a double twist spindle pivoted at its lower end and so mounted that when free it falls forward to a nonoperative position, a collector for the twisted yarn, a yarn break detector, catch mechanism for holding the double twist spindle in a vertical driving position and releasing it at the instigation of the yarn break detector and release mechanism for removing the yarn collector from its drive, also at the instigation of the yarn break detector.

3; A yarn twisting machine comprising a double twist spindle pivoted at its lower end and so mounted that when free it falls forward to a nonoperative position, a collector for the twisted yarn comprising a pivoted cradle for holding the yarn package, a driving shaft, a roller mounted on the said shaft to drive the yarn package by surface contact, a cam having a lug mounted on one end of the driving shaft, a yarn break detector comprising a floating lappet pivoted on the front of the said cradle, catch mechanism for holding the double twist spindle in a vertical driving position, the arrangement being such that the floating lappet is normally supported by the yarn but that when a yarn breaks, the lappet swings about its pivot into the path of the lug on the cam which thereby lifts the cradle out of contact with the driving roller and at the same time'releases the catch mechanism so that the double twist spindle falls forward to the inoperative position.

4. A machine as claimed in claim 3 wherein the catch mechanism comprises a see-saw and a Bowden wire connected at one end to the catch holding the double twist spindle vertical and at the other end to one arm of the see saw, the said catch mechanism being operated when yarn breakage occurs by the rising cradle depressing the arm of the see saw and so lifting the arm connected to the Bowden wire and releasing the catch of the double twist spindle.

- J. K. HARTLEY.

V. F. WEST. T. E. EDWARDS.

No references cited.