US2451133A - Yarn carrier stop motion - Google Patents

Description

Get. 12.19% I E. VOSSEN 2,451,133

' YARN CARRIER STOP MOTION Filed Jan. 23, 1948 IN V EN TOR.

ATTOPA/E),

center post of the knitting machine.

Patented Oct. 12, 1948 UNITED STATES fO'FFlCTE 4 Claims. 1

This invention relates'to newand useful improvements in yarn carrier stop motions, and has particular reference to those types of stop motions which are mounted above the feeds of a knitting machine.

The new and improved yarn carrier stop mo- "tion, in accordance with this invention, is particularly useful on knitting machines which do knitting Lin which .certain threads alternately stop and start knitting during the knitting operation. striper knittingmachines fall in :this class. .Forexample, ina striper knitting machine having32 threads, it is customary that a certaingroup of these threads knit at one time, :.and-at another time another group knits, etc. to t-formthe stripe design. A 32 end knitting machine could use-8 striper boxes with 4 color changers on each box. The striper machine .could also operate without the striper boxes.

However, in all machines of this type when a .thread stops knitting itsbecomes slack. Unless this slack is taken up the thread will become entangled andknotted. It is not unusual for the slack threads to become wound around the is this a waste of thread, but frequently the thread becomes entangled in a @wayto operate the stop motion devices on theknitting machine tostop the machine for preventing a press-off.

It is customary to use a yarn carrierstop motion-at each of the feedsof knitting machines.

These stop motions are usually each provided with an arm having one or more yarn-guiding elements anda cooperative fly-wireswitch operator provided with a yarn guiding elementfor .controlling the operation of the stop motion.

.When slack in the thread occurs, the fiy-wire :operator is freed and moves, and if itmoves a sufficiently large distance the stop motionoperates to stop the knitting machine. However, in those types of knitting machines in which striping is done, or in which there is starting and stopping of threads, the slack is exceptionally largeand the ordinary type of yarn carrier stop motion does not work very satisfactorily here. It'functions to correctly stop the knitting machineshould a press oif threaten; but it does not prevent the entangling of the yarn around the central postof the knittingmachine whichresults in wasting of thread. It is customary to'enlarge the lengths of the arms and of the flywires on the stop motions used at the feeds of *knitting'machines in which the threads stop and 'start,'but this enlarged construction is objectionable in that the arms and'fly-wires are-then-so Not only 12 long I that the 'entire'arrangement is too cumbersome andnot very satisfactory or practical when inuse.

This invention proposes toshorten the arms of the-yarn carrier stop motions, and tocorrespondinglyshorten the fiy-wire switch operators, and

"then in-0rderto take :up the large amount .,of

slack in the yarn, it is further proposed to .con-

struct :the 'fly-wiresiand the yarneguiding ele- 10-.

ments on the arms -so that. each fly-wire draws more than one loop of the thread. With this arrangement the stop motion device is capable. .of

taking up all of the slack and hold the yarn-in aposition in which it will. not'become-entangled,

i resultingin a great saving ofyarn.

This specification shows one form of the inventioninwhich two loops are drawn: in the-yarn with-one fiy-wire, but this is'merely by Way :of illustration since the'principlermay be enlarged to idraw more thantwo loops with each fly-wire.

The invention also proposeszto make other .desirable :improvementsin the yarn carrier stop motion. For examplernow that more than one loop is being drawn it is necessary to 'providei-the stop motion withmany yarn guiding elements.

arrangement'is therefore proposed by which the'yarn guiding elements may be cheaply an easilymounted. in position.

A; simple arrangement is also proposed for catching and holding the yarn when the loops are being pulled, to prevent yarn from .being drawn off the supply spools so that the loops will take .upthe slack yarn between the stop'motion and the'fee'ds of the knitting machine.

aand of the objects and advantages thereof, ref- "erence will'behad'to the following description and accompanying drawing, and to the appended claims in which the various novelfeatures of theinvention are more particularly set forth.

' In the accompanying drawing formingamaterial part of this disclosure:

Fig. 1 is a plan view of a yarn carrier stop motion constructed in accordance with this inven- -tion, the outer end of the fiy-wire switch operator being broken awayto simplify the disclosure.

Fig.2 is a front elevational'view of Fig, 1.1 to whicha schematic showing has beenadded'indh eating the manner in which a plurality of loops --are--drawn"--by one fly-wire.

Fig. 3-is a fragmentary enlarged .elevational 3 view looking in the direction of the line 3-4 of Fig. 2.

Fig. 4 is a sectional view taken on the line 4-4 V of Fig. 3.

Fig. 5 is a fragmentary perspective view of the fly-wire, per se, as seen looking in the direction of the line 5-5 of Fig. 3.

Fig. 6 is a sectional view taken on the line 6-6 of Fi 3.

The yarn carrier stop motion I0, in accordance with this invention, is provided with an arm I'I I9 in which 'the switch elements are housed.

There is an insulated terminal 20 at one side :for the electric circuit through the stopmotion. The box I9 is supported by a fastening element :2! on the usual support bar or ring 22. The flywire switch operator I5 is mounted on an operator shaft 23 which extends into the box and controls the s witch'action. At the front the box I9 is provided with a frame. 24 formed from a strip of material. This frame 24 is provided with a yarn guiding element 25. The arm II isheld in various angular position on the box I9 by a screw 26.

The yarn guiding element I2 is mounted on a bracket 2'! which is adjustably connected with the arm I I by a screw 28.. The yarn guiding elements I3 and I4 are mounted on a U-shaped bracket 29 which is mounted on the arm II by spot welding at the points 30. The fly-wire switch operator i5 is in the nature of a piece of wire having a longitudinal main portion 50 attached to the operator shaft 23;, The main portion 59 continues into .a laterally extending portion 5i continuing into a V-shaped ofiset portion 33 which connects with a small longitudinal portion 52 connecting with a V-shaped offset portion 32 which continues into a laterally extending end 53. The laterally extending portion 5I and end 53 extend across the topedge of the arm II for limiting downward movement 4 of the fly-wire operatorrl5 to a position approximately aligning the yarn guiding elements I6 and IT with elements I3-and I4. The yarn guiding elements IE and I! are mounted between the arms of the V-shaped offset portions32 and 33. One of the arms of each of these offset portions is formed with a bulged out portion 34 mating with the curvature of the yarn guiding element to releasably hold it in position. The yarn guiding elements I2, I3, I6 and I! are of the type having end flanges so that the yarn may be pulled laterally with a minimum-of friction at each of the ends of it. I

The yarn guiding elements I2 and I3-are held in position by a pair of removable clips 36 engaging behind each :of the flanged ends thereof.

. Relatively large apertures 31 are formedin the brackets 27 and 29 which are large enough for the yarn guiding elements to pass through. I-Iowever, the clips 35 are engaged behind each of the flanges of the yarn guiding elements and abut the adjacent faces of the brackets for removably holding the yarn guiding elements in place. With this arrangement there. is no need'for cementing the yarn guiding .elements in .position, v

The yarn guiding element I4 which is cldsest to the switch box I9 is associated with a thread catcher 40. This thread catcher 40 is in the nature of a tube having a slot 4I formed in its top. This slot 4| has its outer end large and tapers to its inner end. The edges 42 of the outer end of said slot II are curved so as to guide the yarn into the converging inner end of said slot 4 I The bracket 27 is set below the bracket 29 so that yarn guiding element I2 is below yarn guiding element I3, causing the yarn 45 passing through the catcher 40 to move along the bottom of catcher 40 free of the slot 4I when the fly-wire operator is in its extreme down position and held by the taut moving yarn 45.

The thread or yarn 45 works in the direction of the arrow 46 during the knitting operation. It comes from the supply spool. It passes through the yarn guiding element 25, then through the yarn guiding element I4, then the yarn guiding element I'I ,.then I3, then I6, and-finally I2;

The operation of the new device may be understood from the following: I 1- i In full lines, in Fig. 2, the yarn carrier'stop motion device is shown as it appears during the knitting operation of the yarn 45. The tension of the yarn 45 holds the fly-wire switch oper tor I5 in the position shown. However when the knitting machine functions so that knitting of V the yarn 45 stops, the yarn 45 becomes slack. Immediately, the fly-wire switch operator I-5moves upwards because of the usual function of the yarn carrierstop motion I0. When t'heffiyrwire switch operator I5 moves upwards-it pulls two loops from the yarn 45, namely, the loop 45' and the loop 45", indicated by the dot and dash lines. The dot and dash lines I5 indicate the fiy w'ire switch operator in its fully raised positi-on'in which the stop motion II} will function tostop the knitting machine. During the normal operation of the stop motion I0 the fly-wire switch operator I5 doesnot reach the full up position, but reaches an intermediate positi'on.' However, all the slack in the yarn 45 will be taken up because the fiy-wire switch opera-tor I5 draiws two loops 45' and 45". f

It should alsobe noted that .ass oon as the flywire'switch operator [5 moves upwards the yarn 45 is forced into the catcher slot H. This prevents yarn 45 being drawn off the spool. It causes I the yarn to the front of the thread catcher 4'0 thefiy wire switch operator I5 back into its orig-' 45 caused by this yarn being cut out of the knittingoperation, When the knitting operation resumes the pull of the knittingmachine will draw Vinal position, illustrated by the full lines', in which position the yarn45 will be moveddo'wnwards and forced out from the catching slot 4| and back to its free position. The knitting now 'proceeds'iin the usual way. I 7 I K The yarn guidingrelements I2 and i3gn1ay be removed and replaced merely by pulling the clips 36 out. .The yarnfguiding elements I6 andf'I'I may be released by slightly spreading the arms of the V-sh-a-ped offset portions 32 -and.33. The yarnguiding element I4 is-per-manently mounted inposition. 7 While I have illustrated and'described the preferred embodiment of my invention, i-tis tolbe understood th-atI do not limitmyself to the precise construction herein-disclosed and the right isreseryfid to all changes and modifications corning within the scope of the invention as defined in the appended claims.

Having .thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. The combination with a yarn carrier stop motion having an arm provided with a plurality of spaced yarn guiding elements and a fly-wire switch operator provided with a yarn guiding element normally between a pair of said yarn guiding elements for pulling a loop of said yarn when said yarn slackens, of an additional yarn guiding element on said fly-wire switch operator and normally disposed between a pair of said first mentioned yarn guiding element-s other than said pair for pulling an additional loop of said yarn when said yarn slackens.

2. The combination with a yarn carrier stop motion having an arm provided with a plurality of spaced yarn guiding elements and a fly-wire switch operator provided with a yarn guiding element normally between a pair of said yarn guiding elements for pulling a loop of said yarn when said yarn slackens, of an additional yarn guiding element on said fiy-wire switch operator and normally disposed between a pair of said first mentioned yarn guiding elements other than said pair for pulling an additional loop of said yarn when said yarn slackens, and yarn catching and releasing means to the front of said yarn loops for catching and holding said yarn at this point when said fly-wire switch operator starts drawing said loops and releasing said yarn when said fly-wire switch operator moves back to its normal position.

3. The combination with a yarn carrier stop motion having an arm provided with a plurality of spaced yarn guiding elements and a fly-wire switch operator provided with a yarn guiding element normally between a pair of said yarn guiding elements for pulling a loop of said yarn when said yarn slackens, of an additional yarn guiding element on said fly-wire switch operator and normally disposed between a pair of said first mentioned yarn guiding elements other than said pair for pulling an additional loop of said yarn when said yarn slackens, and yarn catching and releasing means to the front of said yarn loops for catching and holding said yarn at this point when said fiy-wire switch operator starts drawing said loops and releasing said yarn when said fly-wire switch operator moves back to its normal position, said yarn catching and releasing means comprising a tube with a slot having its sides converging and into which said yarn moves when said fly-wire switch operator moves from its normal position.

4. In a yarn oarrier stop motion having an arm provided with a plurality of spaced brackets having apertures, flanged yarn guiding eyelets engaging through said apertures, and a pair of clips for each eyelet engaging behind the end flanges thereof and against the faces of said brackets for releasably holding said eyelets upon said brackets.

EDWARD VOSSEN.

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

UNITED STATES PATENTS Number Name Date 1,784,560 Wachsman Dec. 9, 1930 2,362,781 Tellerman Nov. 14, 1944

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