US1518720A - Stop mechanism for twisters and the like - Google Patents

Description

Dec. 9, 1924- 1,518,720

H. WILKINSON STOP MECHANISM FOR TWISTERS AND THE LIKE Filed June '4, 19,23

Patented Dec. 9, 1924.

UNITED STATES PATENT OFFlaCE.

HARRY W ILKINSON, OF METHUEN, MASSACHUSETTS, ASSIGNOR T0 SACO-LOWELL SHOPS, 0F BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

STOP MECHANISM FOR TWISTERS AND THE LIKE.

Application filed June 4,

To all whom it may concern:

Be it known that I, HARRY TVI KWSON, a citizen of the United States, residing at Methuen, county of Essex, State of Massachusetts, have invented a certainnew and useful Improvement in Stop Mechanis for Twisters and the like, of which the followin is a specification, reference being had therein to the acompanyingdrawings.

This invention relates to twisting or-spinning frames or the like'in which the strands or yarns to be spun or twisted are drawn from reels or other suitable sources of supply by means of delivery rollers from which said strands or yarns pass to the spindles. The delivery rollers and spindles are rotated at different rates of speed bearing a predetermined ratio to one another in order to determine the tightness of twist. In such machines, it is customary and desirable to employ a suitable stop mechanism for arresting the rotation of a delivery roller in the case of breakage of one or more of the strands or yarns passing therefrom to the corresponding spindle, in order to prevent the waste of material caused by fur ther drawing of yarn from the source of supply bythe roller and consequent wrapping of the same about the latter. {A form of stop mechanism for this purpose, now quite generally employed in machines of this type, is shown in Letters Patent No. 753,338,'granted March ,1, 1905, on an application filed by Channing Whitaker. The stop mechanism shown in said patent is controlled by a pivoted arm or lever having at its end an eye through which the yarns are guided in their passage from the delivery roller to the spindle, the yarns above and adjacent the guide eye occupying a position which is oblique to the pivoted arm, the later being held in a depressed position by the tension of said yarns. The operation of the device depends upon a very delicate balance of the pivoted arm, which is provided with a weight longitudinally adjustable thereon in order to control the balance. It is found in practice that this necessary delicate balance is quite easily upset, the jarring of the frame being); suflicient to loosen the adjustable weight and move it out of its adjusted position, thereby disarranging the mechanism so as to cause the same to operate at improper times orto fail to operate when it should,

1923. Seriafl No. 643,199.

and resulting in a considerable waste of material and loss of the time of the attendantin readjusting the parts.

The present invention has for its object to obviate the difiiculties last referred to and to provide improved means for controlling the stop mechanism, which means are not dependent for their operation upon any delicate balance between the tension of the yarns and an adjustable weight.

The foregoing and other objects of the invention, together with means whereby the same maybe carried into effect, will best be understood from the following description of one form or embodiment thereof illustrated in the accompanying drmvings, in which:

Fig. 1 is a fragmentary side elevation of one unit of a spinning or twisting frame provided with a stop mechanism control constructed and arranged in accordance with the invention.

Fig. 2 is a section taken substantially on the line 2-2, Fig. 1.

In the drawings is shown one unit of a twister frame having longitudinal rails 10, 11, 1'2 and 13 by which the respective parts of the several units and the actuating mechanism therefor are carried. The spindles 15 journalled in the rail 10 are provided with the usual caps 16 and are rotated at a predetermined speed by suitable driving connection, not shown, which may be of any usual and well-known form. The strands or yarns 17 are drawn from suitable sources of supply, not shown, by delivery rollers 18 disposed with their axes vertical, said yarns "passing to and from said rollers through suitable guides 19 and 20 supported on the rail 13. The yarns pass to each spindle 15 through a guide eye 21 carried by the end of an arm or lever 23 pivoted or fulcrumed at. 24 upon a bracket or upright 25 secured to the rail 11. Each delivery roller 18 is carried by an upright spindle or shaft 26 journalled in a yoke 27 and provided with a worm gear 28 which cooperates with a worm 29 on a shaft 30 extending longitudinally of the machine. The yoke 27 is provided with trunnions 31 by which said yoke is pivotally connected with a bracke' 32 supported by the rail 12, said yoke being so balanced as normally to tend to swing the gear 28 out of mesh with the worm 29. The parts are normally held in the position shown, with the gears 28, 29 engaged, by means of a latch 33 pivoted at 3a to the rail 12 and engaging an arm 9 on said yoke. The arm 9 is formed with a downwardly turned end 35 which is engaged by the upwardly turned end 36 of the lever 23 when the forward end of said lever is depressed to swing the yoke 27 and move the gear 28 into mesh with the worm 29. Pivoted' to the latch 33 is a trip 37 which is normally held, by means hereinafter described, in the position shown in the drawings, but which, when released, is adapted to swingby gravity into the path of movement of radially projecting pins 38 on the hub 39 of the ear 28. When this occurs, the trip 37 is engaged by one of the pins 38, which acts through said trip to swing the latch 33 out of engagement with the arm 9, thereby permitting the yoke 27 to swing outwardly and disengage the gears 28 and 29. i

The parts thus far referred to may be substantially as shown and described in the patent to Whitaker, above referred to, or otherwise as may be preferred. i

In accordance with the present invention the trip 37 is controlled by a drop wire 40 guided for longitudinal vertical movement in a bushing 41 carried by a fixed bracket 42 secured to the rail 12. As herein shown, the yarns17 between the guides 20 and 21 pass over an additional longitudinally disposed guide rod or roller 43 between which and the guide 20 the said yarns extend in a straight, approximately horizontal stretch. The drop wire 40 is formed with a hooked upper end 4A which rests by gravity on said approximately horizontal stretch of said yarn. At its lower end, the drop wire 40 is bent at substantially right angles to form an angularly offset arm 45 which is guided in a slot 46 in the bracket 42 and engages an arm 47 on the trip 37.

In operation, when the strands or yarns 17 are intact, the drop wire 40 is supported thereby in the position shown in the drawings, and the trip 37 is therefore held out of the path of movement of the pins 38. Should the yarns 17 or either of them break, said drop wire is permitted to move downwardly under the influence of gravity, thereby permitting said trip to swing into a position to be engaged by one of the pins 38 and causing the stop mechanism to operate to disengage the gears 28 and 29 and stop the delivery roller 18, as above described. When the broken yarn is replaced, the drop wire 40 is again raised and hooked thereover, whereupon the forward end 21 of the latch 23 is depressed to cause the rear end thereof to engage the end of the arm 9, and swing the gears into engagement, the latch 33 being so weighted as to swing by gravity into position under the arm 9, thereby holding the parts in the position shown. 2

It will be seen that the mechanism described is such as to cause the stop mechanism always to act when, but only when, the yarn breaks, being not dependent for its operation upon any delicate balance of parts which may he accidentally displaced under the influence of the jarring of the frame or otherwise.

Having thus described my invention, I claim 1. In a twisting frame or the like, in combination, a spindle, a delivery roller, mechanism for driving said roller, a stop mechanism therefor, a pivoted arm for resetting said driving mechanism when disconnected by said stop mechanism, means including an eye carried by said arm for guiding the yarns from said roller to said spindle, and means independent of said arm and controlled by the yarns for controlling said stop mechanism.

2. In a twisting frame or the like, in combination, a spindle, a delivery roller, mechanism for driving said roller, a stop mechanism therefor, a pivoted arm for resetting said driving mechanism when disconnected by said stop mechanism, means includingan eye carried by said arm for guiding the yarns from said roller to said spindle, and a drop wire resting by gravity on a substantially straight stretch of said yarns and operatively connected with said stop mechanism t vcontrol the same.

3. In a twisting framleor the like, in combination, a spindle, a delivery roller, driving devices for said roller, a latch for holding said driving devices in operative engagement, means including a trip for releasing said latch to cause disengagement of said devices and stop said roller, and a drop wire supported by the yarns between said roller and spindle and operatively connectedwith said trip to control the same.

4. In a twisting frame or the like, the combination with a spindle, a delivery roller and a stop mechanism for said roller, of a drop wire supported by the yarns between said roller and spindle and operatively con-- nected with said stop mechanism to control the same, and a fixed guide in which said drop wire is longitudinally and vertically movable.

' 5. In a twisting frame or the like, in combination, a spindle, a delivery roller, driving devices for said roller, a pivoted arm for movingsaid devices into operative engagement, a latch'for holding said devices in operative engagement, means including a trip for releasing said latch to cause disengagement of said devices and stop; said roller, means including an eye carried by said arm and an additional guide forguiding the yarns from said roller to said spindle and holding a stretch thereof in an approximately horizontal position, a drop wire resting by gravity upon the approximately horizontal stretch of said yarns and operatively connected with said trip to control the same, and a fixed guide in which said drop wire is longitudinally and vertically movable.

6. In a twisting frame or the like, in combination, a spindle, a delivery roller, driving devices for said roller, a latch for holding said driving devices in operative engagement, means including a trip for releasing said latch to cause disengagement of said devices and stop said roller, a drop wire supported by the yarns between said roller and spindle and having an angularly offset arm connected with said trip, and a fixed bracket 15 in which said drop wire is longitudinally and vertically movable, said bracket having a slot in which said offset arm is guided.

In testimony whereof I aflix my signature.

HARRY WILKINSON.

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