US2924931A

US2924931A - Thread feeding stop device for yarn-forming machine

Info

Publication number: US2924931A
Application number: US687532A
Authority: US
Inventors: Kuhnrich Max; Lassig Gerhard; Schulze Willy
Original assignee: Spinnerei Karl Marx VEB
Current assignee: Spinnerei Karl Marx VEB
Priority date: 1956-10-19
Filing date: 1957-10-01
Publication date: 1960-02-16
Anticipated expiration: 1977-02-16
Also published as: GB854852A; CH357660A; FR1180961A

Description

Feb. 16, 1960 M. KUHNRICH ETAL THREAD FEEDING STOP DEVICE FOR YARN-FORMING MACHINE Filed Oct. 1. 1957 ATTORNEYS United States Patent THREAD FEEDING STOP DEVICE FOR YARN-FORMING MACHINE Max Kiihnrich, Karl-Marx-Stad-t, Gerhard Lassig, Neukirchen, and Willy Schulze, Karl-Marx-Stadt, Germany, assignors to VEB Spinnnnd Zwirnereimaschinenbau Karl-Marx-Stadt, Karl-Marx-Stadt, Germany Application October 1, 1957, Serial N0. 687,532

Claims priority application Germany October 19, 1956 2 'Claims. (Cl. 57-85) This invention relates to a thread control means and more particularly to a device for stopping the delivery of the individual strands of thread in the event of breakage thereof in machines used to produce multi-strand yarns.

Heretofore, inmachines' of this type it has been known to stop the delivery of'strands of thread in the event of breakage by moving the brokenthread laterally out of engagement withthe delivery shaft by means of a weight or an active resiliently urged pivotal lever. This pivotal lever, which is commonly designated as a removal lever, is tiltable transversely about a joint and is arranged such that it is held in an upright position and is movable out of this position upon thread breakage into a thread removal position when it is tilted by the slightest force. Another known device is operative such that one arm of a lever is held by the tensioned thread and the other end of the arm upon thread breakage is effective to move the thread out of engagement with the delivery shafts. This latter arm is formed with an oblique edge which engages the broken thread and permits the thread to slide laterally thereover. These prior devices all have the common drawback that the broken end of the thread remains hanging loosely and becomes entangled with adjoining shafts such'that it must be withdrawn from the feeding pressure roller. Hence, the loosely hanging ends of the broken ends of the thread are lost within the machine and in order to continue the operation of the machine the thread is tied together at points remote from the original broken ends which necessitates that the threads be manually inserted between the presser and delivery rollers of the machine.

It is an object of the present invention to provide a stop device which overcomes these difliculties and drawbacks.

By the present invention this is accomplished by an arrangement including a pair of cooperating thread removal levers of which one of the levers is held by the tensioned thread and the other thread removal lever by means of its own weight is effective to move both levers upon breakage of the thread and thereby laterally shift the thread out of its normal pressure engagement with the pressure surface of the pressure roller. To this end the pressure roller is formed with a peripheral thread entrapment groove, having a conical bottom surface. A strand of the thread is wound around the pressure surface at least once and the thread enters into single thread eye of the thread guide twice. Also the removal lever performing the lateral shifting of the broken thread is formed with a forked end and a thread guiding arm.

A feature of the present invention is the provision of recesses on the upper edge of the conical surface which recesses are arranged either inclined of parallel to the axis of the cylinder.

Further objects and features will hereinafter appear.

in the drawings:

Fig. l is partial end elevational view of a yarn winding machine embodying stop arrangement of the present invention.

2,924,931 Patented Feb. 16, 1960 Fig. 2 is a rear elevational view showing the elements of the stop arrangement in its operative position when the thread is whole.

, Fig. 3 is similar to Fig. 2, showing the elements of the stop arrangement immediately after the thread has been broken. l

Fig; 4 is'similar to Figs. 2 and 3 but showing the elements of the stop arrangement after the thread has been laterally shifted into thread entrapment groove of the pressure roller.

Fig.5 is a view of the pressure roller.

Fig. dis a cross sectional view of Fig. 5 taken substantially along the lines A-B.

Referring now to the drawings, the strand of thread 1 originates from a thread cop (not shown) or the like and is threaded through the eye of the thread guide 2, wound about the pressure cylinder 3 and again threaded through the eye of the thread guide 2, then between the p i ssure cylinder 3 and the delivery cylinder 4 from whence .it is guided to the yarn spindles (not shown). In the drawings the numeral 5 designates the operative thread strand condition sensing position of the removal lever and the numeral 5a its rest position (see Fig. 1). A forked thread shifting lever 6 is operatively and movably associated with the removal lever 5, 5a and for the purpose of improving the thread guiding characteristics is also provided with a thread guiding limb 7. Formed on the periphery of the pressure roller is a groove 8 having a conical bottom surface which tapers upwardly into the periphery. The upwardly drawn thread end of the severed thread is designated as 1a (see Figs. 3 and 4). The direction of rotation of the pressure cylinder is indicated by the arrow 9 and the arrow 10 shows the direction of the thread as it travels through the stopping device of the present invention. Provided in the groove 8 of the pressure cylinder are elongate grooves 11.

The operation of the stopping device is as follows:

The thread 1 originates from a thread cop or the like (not shown) and is threaded through the eye of threaded guide 2 and wound once about the pressure cylinder 3 and again threaded through the thread guide eye 2 in order that it may be guided between the pressure and

delivery rollers

3 and 4 respectively. The thread therefore travels in the direction of the arrow 10. Due to the fact that during normal winding the thread 1 is under tension the removal lever 5, 5a is held in the position shown in Figs. 1 and 2. The fork ended lever 6 which is movably coupled with the lever 5, 5a is thread held in the position shown in Figs. 1 and 2 by the tension of the thread and guides the thread 1 between the forks such that the thread extends beneath the pressure surface of the pressure cylinder 3. Lever 6 swings in a plane parallel to the axis of the

pressure cylinders

3 and 4 about a shaft 12. Lever 6 is coupled with lever 5 by means of an extension pin 13 which engages a loop 14 on lever 5. The lever 5 swings on a pin 15 secured to shaft 12. When the thread breaks it is, of course, no longer tensioned and is unable to maintain the removal lever in its upright position shown in Figs. 1 and 2 and it drops to a rest position as illustrated in Figs. 4 and 5. The downward pivotal movement of the removal lever 5, 5a also causes the lever 6 to swing in a plane parallel to the axis of pressure cylinders and normal to the lever 5, 5a to move the broken thread strand 1a into the confines of the groove 8 wherein it is entrapped. After the thread break is repaired as by tying the severed ends together, the removal lever 5, 5a is returned to its upright position under the influence of the tension of the thread whereby the thread transporting means is automatically positioned since the forked end of the thread shift lever is effective to shift the thread over the conical surface 8 and beneath the pressure surface of pressure roller,

The shifting of the thread over the edge formed by the pressure surface and the conical surface is facilitated by the provision of the grooves ll which are inclined at lesser angle to thelongitudinal axis of the pressure "roller than the conical surface.

What we claim is: I I v v p 1.- In a multi-strand yarn-forming machine having an eye guide adapted to guide said yarn, a rotatable pressure cylinder spaced from said eye guide for stretching and looping said yarn to said eye guide and back to said pressure cylinder, a rotatable delivery roller in feeding contact with said pressure cylinder at theside of said pressure cylinder where said yarn is doubled ba'ck,'aring groove in said pressure cylinder larger than individual strands of said yarn adapted to grasp and wind up yarn brought into said groove, a yarn shifting :nieinber movable with respect to said pressure cylinder and responsive to the tension in said yarn adapted to shift said yarn between said eye and 'said pressure cylinder into 'said groove upon release of tension in said yarn, and out'of said groove upon resumption of tension in said arn,

said yarn-shifting member including gravity movable hook means movable to an upward position by tension in said yarn, and movable to a downward positionby release of tension in said yarn and subjection of said book means to gravitational force, said yarn-shifting means including fork means laterally movable with respect to said pressure cylinder in response to said hook means, said ring groove including a conical surface and a vertical surface, and a slot groove upon said conical surface'in said ring groove inclined to'the longitudinal axis of said pressure roller.

2. The method of controlling the passage of yarn from a feeding eye to a delivery roller in feedingc'ontac't with a pressure cylinder which comprises feeding said yarn through said feeding eye and between said pressure cylinder and said delivery roller, looping said yarn about said pressure cylinder back to said feeding eye, doubling said, yarn overback between said pressure cylinder and said delivery roller, and shifting said yarn between said feeding eye, andsaid line of engagement between said delivery roller and said pressure cylinder into a groove in 'fsaidpressure cylinder upon relaxation of tension in j Lidyarn, and shifting said doubled-over yarn back out or said groove upon resumption of tension in said yarn.

References Cited in the file of this patent UNITED STATES PATENTS Rho'a d'es -4 Nov. 30, 1909 Hartley Apr. 30, 1929