US2651332A - Thread holder for looms - Google Patents

Description

sept. s, 1953 R. cs. TURNER 2,651,332 THREAD HOLDER FoR Looms Filed April l, 1952 2 Sheets-Sheet l l l l 1Il llmlllul RICHARD G'. TURNER www ATTORNEY.

Sept. 8, 1953 R. G. TURNER 2,651,3321

THREAD HOLDER RoR Looms Filed April 1, 1952 2 Sheets-Sheet 2 INVENTOR RICHARD G: TURNER ATTORNEY.

' the loom but which Patented Sept. 8, 1953 OFFICE 2,651,332 THREAD HOLDER FOR LOOMS Richard G. Turner, Worcester,

Knowles Loom Crompton &

Mass., assignor to Works, Worcester,

Mass., a. corporation of Massachusetts Application April 1, 1952, Serial N o. 279,738 14 Claims. (Cl. 139-257) This invention relates to thread holder mechanism for weft replenishing looms and it is the general object of the invention to provide such a mechanism which will be in thread non-clamping position on normal non-replenishing beats of on a weft replenishing beat of the loom will move to thread clamping position to hold the thread of the transferred bobbin to insure self-threading of the freshly replenished shuttle when it is picked.

In order to effect self-threading ofthe shuttle a weft replenishing loom it is desirable to have the thread holder for the weft ends of reserve bobbins in the magazine in a position sufficiently to the rear so that as the shuttle is picked out of the shuttle box under the magazine the thread from the thread holder will be more or less aligned with the shuttle eye. Many looms of the weft replenishing type however are provided with a center filling stop motion fork on the lay and if the thread holder remains in rear position too long there is likelihood that the thread of the freshly replenished shuttle will be behind the fork and not support it with resultant unnecessary loom stoppage.

In order to prevent this stoppage means have already been proposed for controlling the thread holder so that it can be in rearward position at the time of shuttle picking and then be moved to a forward position to draw the thread under the filling fork. Means for accomplishing this result are shown for instance in my prior Patent No. 2,531,177. In that patent the thread holder is of the pneumatic type, but in the present instance it is of the mechanical clamping type.

It is an important object of the present invention to provide a clamping and releasing thread holder having a movable jaw the position of which with respect to a jaw fixed on the thread holder is determined by a controller mounted to move bodily with the thread holder. The controller has abutting engagement with a stationary stop to hold the thread holder in open or nonclamping position under normal conditions, but when the thread holder moves rearwardly the controller is moved to relax its control of the movable jaw and the latter can then be moved to clamping position by means such as a spring.

It is a further object of the invention to construct the controller so that it can be moved out of engagement with the stop to enable the thread holder to continue to move rearwardly after the jaws are in clamping position. Y

It is a `further object of the invention to providea unit including a thread holder and a supporting arm therefor provided with ya controller to determine the position of the movable jaw.

In order that the invention may be clearly understood reference is made tothe accompanying drawings which illustrate by way of example the two embodiments of the invention and in which: Y Fig. 1 is a side elevation of part of a weft replenishing loom having the preferred form of the invention applied thereto, n Fig. 2 is an enlarged side elevation of the thread holder properl showing the latter in open or non-thread clamping position,

l Figs. 3, 4 and 5 n lines 3-3, 4-4 and 5 5, respectively, Fig. 2, Fig. 6 'is a vertical section on line 9 6, Fig. 2, Fig. 7 is an enlarged View of a part of the structure shown in Fig. 1, setting forth part of the carrier for the thread holder,

stop, Fig. 9 is a diagrammatic View showing the thread holder in normal forward non-clamping position in full lines and in rearward clamped position in dotted lines,

Fig. 10 is a diagrammatic plan of part of the lay showing the shuttle of the invention,

Fig. 12 is a rear elevation looking in the direction of arrow I2, Fig. 11, and

Fig. 13 is a -detail plan view, enlarged, looking in the direction of arrow I3, Fig. 11.

Referring to Fig. 1, the loom frame I supports top and bottom shafts 2 and 3 which may be connected by conventional gears fl and V5. top shaft will ordinarily rotate once for each one-pick cycle of the loom and operates by usual means to reciprocate the lay L backwardly and forwardly, to the right and left as viewed in Fig. 1. The lay is provided with the usual meansfor which is actuated in usual manner by lug strap 1.

The loom is providedV are detailed horizontal sections with a reserve bobbin:

desiree 3 thread holder designated generally at H. The magazine includes in its construction the usual tie rod 8 which is used herein as a pivotal support. Under normal conditions the lay swings backwardly and forwardly and when moving rearwardly from its front center position and approximately at its top center position the picker stick will pick` the shuttle to the opposite side of the loom and the shuttle will ordinarily be in flight until some time during the ensuing fore, ward motion of the la a center lling fork F, see Fig. 10, which must be supported by weft in order to permit continued loom operation. If for any reasonv the forkis notJ supported it will fan and-'welleknewn mecha nism not set forth herein will then VeffectY loom stoppage. may be used to transfer a bobbin selected from the magazine into the shuttle on a weft replenish'- ingbeat of the loom, preferably asthe lay moves ferwruidiy.V A' l The atter thus far described may be of usual construction 'andoperatesinthe 'usual manner and except as pointedout hereinafter forms no part of my present invention.

Referring to Figs. l, 7 and 8, a `carrier arm I5 is provided with a bearing hub, IIS pivotally mounted on the tie rod 8f. A limiting member I1 is secured to the tie rod by a set screw I8 and is formed with depending front and back arms IS and 25, respectively, between which the arr`n`l extends.v Thelowe'r end of the front arm I9 may be consideredto be a stop 2 I fixed on the loom `forward yo'fa'r'rn `I5 vfor alpurpose to be set fori-.jh hereinaiter.

' The lower end o f arm I5 Yhas secured thereto the previously mentioned threadvholder H. The latter includes a rear primary jaw member 25 which is secured by screws Zitto the lower end of arm l5; 'The primary jaw 25 may be made to extend vertically and baie-hand vforth in the loom and may if desired have a thread 'engaging 'surface 2l which may bemadfe fof soft elastiematerial-,Usuch fas rubber.. llxten'ding laterally from one side or the jaw 25 are two vhres V311 and el 1oeated respectively at the'rignt and left as inuicated in Fig. Y3A. These lugs have fitted into them a shield-3240i a flexible 'wire or controller` designated generally jat "C; A'flexible inner 'core 33 is sli'dabl'e within the shield. l

c A secondary movable jaw 35 also having 'a threadengaging surface 36 similar to the surface 21 is pivoted at itslower lend to the primary jaw 25. The` pivot may take the form o'f -a pin 31 as shownin 6; AThe 'secondary jaw 35 is provided with a laterally extending Vlug or abutment 4i! which aligh'swith `"and is` positioned 'for engagement by the core 33 asy shown for instance 3. The upper end o'f the secondary jaw is provided with a head 4i formed -with 'a dependent tongue y42*fwhichfits into an upwardly opening groove or jslot t3` formed in the primary jaw 25 see Figs. Band 6. The jaws 25 and 35 are provided, respect-yew, with Iscrews `or the like 45 and '516 between which is stretched a tension spring 44l whichcauses the secondary jaw to have a tendency tofmove 'towardthe primary jaw, vor to the rig-ht from the position shown in Fig. 2. Normally the jaws 'are separated to define an upwardly yopening thread slot 4-8 forthe weft Aends W. The' arm I5-a`nd the thread holder with its jaws may be consideredto comprise ka thread holder member. Y

The upper end 'ofv the shield 32 is passed through `a hub 5l on the arm-'I5 and is secured Bobbin transfer mechanism @,Fi'gfl;

The lay is provided with to the hubby set screw 5I. The lower end of the shield is fastened to the lugs 30 and 3| by screws 52. The upper end of the core extends beyond the shield, see Fig. 8, and the lower end of the core extends beyond the lower end of the shield. The shield is therefore fixed at its ends with respect to the arm I5 and the core extends beyond each end of the shield. For present purposes it may be considered that the 'upper end of the core has a free end 55 for abutting engagement with the stop 2| while the lower end of the core has another 'freeend 55 for abutting operative engagement withv the lug 40 on the secondary jaw. A 'returnjlspring t0V has the rear end thereof connected 'as .at 6l to the arm I5 and has its forward end connected as at 62 to some xed part ofthe magazine.A The effect of spring 60 is to hold the arm I5 and the holder H normally in the forward position shown in Fig. l. This position may be determined by a front adjustable stop screw 63 on arm I9. Similarly, if desireda second adjustable stop vscrew Ell lon the vrear arm 20 may be used to lirnit rearward motion of the arm I5, VThe spring 50 is stronger than the spring' 5J, but will yield to permit rearwardmotion of the carrier arm `I5.

An actuator rod '651s connected r`to arm I5 at 65 'and extends rearwardly. Theractuator 65 may be operated in any approved manner -and'may for instance be similartolink y6"! shown inthe previously mentioned patent. The actuator 65 need not however be operated 'necessarily by the lstruc ture set forth inth'at patent and it willbe sufficient for the purposes ofthe present invention if the actuator locates arm l5 rearwardly at or about the time o'fishuttle picking on a weft replenishing beat o the loom and then moves 'to efect'return forward inotion of arm l5`by spr-ing e0 a Short time after theshuttie is picked.

Under normal V-conditions the 'a'rrn I5 and the holder will be as shown in Fig. 1 and in full lines in Fig. 9'that is; they will be in forward position and the primary 'freshen-d' 55 of the cor-e will be held firmly Yagainst the 'stop 2`I by spring 68 and the latter will hold the core in -a .relatively rearward Vposition withrespect to that part of` the shield shownfor instancefin Fig. 8. The elect of this relation is to 'causethe lowerv secondary free end 56 of the co're to exert -a forward 'push on lug 40'V to hold the secondary jaw 35 in the open or non-thread clamping position shown in full lines in Fig. `9 against the action of spring 4l. Under these Conditions the weft ends W( can pass freely through the upwardly "opening thread slot Auand the lower `ends of the threads may be wadde'dV together las 'aitf'l tov exert 'a downward pull on the 'weft ends to hoijd them taut, These conditions 'will vprevailon nongreplenis'hing beats of the loomandthe thread holder willbepin a relative forward position with Yrespect to the sweep of the lay. I

When a wetreplenishing operation occurs actuatoi` 65 will moyelrearwardly and swing larm I5 from the full line to the dotted line position shown in Fig. 8, thereby movi-ng the controller C rearwardly to Vrelax the force previously exerted rearwardly byy stop 2l; against the primary free end 55 of the core. The. weak .spring 41 is therefore free to contract :and draw the secondary jaw toward the primary 'jaw as indicated Iin dotted `lines Vin Fig. `9` toclfamp the weft ends. This operation will-ordinarily occur so that the weft ends-can be clamped at the timeof picking of the shuttle to "insure Vproper anchorage for inserted into the shuttle.v

The shuttle, which is of the self-threading typ e,

is then picked and preferably during its flight the actuator 65 moves forwardly, thereby enabling the spring 6 0 to movethe arm l5 forwardly and force free end 55 of the core against stop 2| to effect forward movement of lug 40 by free end 56 to restore the thread holder to its normalnonclamping position shown in full lines in Fig. 9. This return of the thread ho1der;to its vnormal forward position preferably occurs late enough in the cycle of the loom to inusre proper unwinding of the weft on the freshly transferred bobbin and also occurs at a time favorable for movement of the weft end leading from vthe shuttleto a position under the filling fork F.

In Fig. l it is assumedthat the layis in picking position as shownin full lines and that the thread holder will be in relatively rear position, full lines, so that the weft end WI leading from the thread `holder to the freshly transferred bobbin Bl will be aligned `more or less with the shuttle at the start of the pick, Thereafter the lay moves rearwardly to the dotted line position of Fig. -10, the shuttle moves along the lay to the dotted line position, and the thread holder moves forwardly to the dotted line position, the effect of these movements of the lay, shuttle and thread holder being to move the thread of the shuttle to position W2 under the filling fork to support the latter.

In the modified form of the invention shown in Figs. 11 to 13 much of the matter thusfar described will be used but; the controller CI for the secondary jaw, instead ofbeing a `flexible wire, is a lever, As shown more particularly in Fig. 11 an arm 1 0 similar to arm I5 is pivoted as is the latter arm and has the primary and secondary thread engaging jaws 25 and 35, respectively, mounted thereon as in the preferred form. The spring 41 normallyurges the secondary jaw toward theprimary jaw as is the case in the preferred form.

The controller CI comprises a lever 1| pivoted to the arm at 12. Lever 1| has an upwardly extending arm 13 formed with a free end 14 for abutting engagement with the stop 2 A second arm 15 depends from the pivot 12 and as shown in Fig. 13 engages the Yabutment or lug 40 of the secondary jaw, The spring 60 normally holds the arm 10 to the left as viewed in Fig. 11.

In the operation of the modified form of the invention the spring 60 holds the end 14 of lever 1| in abutting engagement with the stop 2| and causes the lever to assume a position relative to arm 10 such that the lower free end 16 of arm 15 will exert a forwardly directed force yagainst the lug 40 to hold the secondary jaw spaced from the primary jaw in a non-clamping position. The weft ends can therefore move freely through the thread slot 48. When the actuator 65 moves the arm 1|] rearwardly the lever 1| moves pivotally in such manner that itslower end 16 moves rearwardly to relieve the force which it exerts on the lug 4U and the spring 41 is thereupon able to move the secondary jaw toward the primary jaw to clamping position to grip the weft ends. When the arm 10 has a return movement to its normal forward position lever 1| will be rocked in the opposite direction with respect to the arm 10 and the lower free end 16 of lever 1| will again exert a forward force on lug 40 to move the secondary jaw to open position spaced forwardly fromthe primary jaw, i

In both forms of the invention a controller is"- provided for the secondary or pivoted jaw 35 and the controller is normally held in abutting engagement with stop 2| to maintain the slot 48 open, but when the carrier arm, either l5 or 10,

moves rearwardly the controller moves with respect to its arm to enable spring 41 to move jaw 35-toward jaw 25 and in clamping relation with respect to the weft ends. It will be noted in both forms of the invention that if the amount of rearward motion of the carrier |5 or 10 needed for correct placement of the thread holder to facilitate shuttle threading is greater than the amount needed to close the slot 48 the free end of the controller can move away from the stop 2| without straining the controller or any other part of the mechanism. In fact, it may be desirable to have the free end of the controller always move away from stop 2| as the thread holder moves to its rear position, since this will insure clamping of the weft ends an appreciable time before picking of the freshly replenished shuttle.

From the foregoing it will be seen that the invention sets forth a simple thread holder mechanism including a controller which operates incident to back and forth movement of the thread holder member to effect closing of slot 48 to clamp the weft ends as the threadv holder moves rearwardly and open the slot to unclamp the weft ends as the thread holder moves forwardly. The free end of the controller which abuts stop 2| can move away from the stop to enable the thread holder to continue its rearward movement after the jaws are in clamping position. When the thread holder returns to its forward position the free end of the controller strikes the stop 2|I and the secondary jaw is thereupon moved forwardly to open slot 48. There is also set forth a thread holder unit for mounting on a tie rod of a magazine. In the preferred form of the invention there is no an-l chorage for the core with respect to any part of the loom, and in the modified form the upper arm of the controller lever 1| is not directly attached to stop 2|. While the spring 6|) has been shown for effecting return movement of the arms |5 and 19 to their normal forward position the invention is not necessarily limited to this Spring and it will be sufficient for the purposes of the invention if the thread holder member moves first in a rearward direction, to the right in Fig. 1, incident to a weft replenishing operation, and thereafter has a return movement to the left to forward position. It is to be understood that the invention is not limited to the use of rubber for establishing clamping relation with respect to the threads passing through the slot 48.

Having now particularly described and ascertained the nature of the invention and in what manner the same is Yto be performed, what is claimed is:

1. In thread Vholder mechanism for the weft ends of a weft replenishing loom, a stop forming part of the thread' holder mechanism, a weft end thread holder member which on a .weft replenishing beat of the loom moves to a rearward position and thereafter moves to a forward D0- sition, said thread holder member comprising a primary thread engaging jaw and a secondary thread engaging jaw mounted on the thread holder member for movement toward and from the primary jaw and having a normal tendency to move toward the primary jaw, and a controller for the secondary jaw mounted on and moving with the thread holder-member havineoriefpart sesta-sr thereof operatively related to the secondary jaw and having another part rearward of said S1509 for abutting engagement therewith, said other part being held against said stop by the thread holder member when thelatter is in forward position and causing said controller to overpower said tendency of the secondary jaw and holdv the secondary jaw spaced from the primary jaw, and said thread holder when moving to the rear-- ward position thereof moving said other part of the controller away fromsaid stop and said sec:-A ondary jaw due to said tendency thereupon mov ing toward the primary jaw.

2. The thread holder mechanism set forth in claim l wherein the controller comprises a flex.- ible wire having a sh-ield secured to the thread holder member and a flexible core Slidablc within the shield and operatively connected to both the stop and the secondary jaw when the thread holder member is in forward position and is operatively connected to the secondary jaw only when the thread holder member is in real'-v ward position.

3.k The thread holder mechanism set forthin claim l wherein the controller comprises a lever pivoted on the thread holder member having an arm for engagement with the stop and another arm for engagement with the secondary jaw.

4. The thread holder mechanism set forth in claim-3 wherein the lever is pivoted intermediate said arms thereoi and is moved bodily relatively to the stop by said thread holder member when the latter moves from one ci said positions thereof to the other of said positions thereof.

5 In thread holder mechanism for the weft ends of a weft replenishing loom, a stop forming part of the thread holder mechanism, a weft end thread holder member which on a weft replenishing beat of the loom moves` to a rearwand position and thereafter moves to a forward p0"- sition, said thread holder member comprisinga primary thread engaging jaw and a secondary thread engaging jaw mounted on the thread holder member for movement toward and from the primary jaw, resilient means normally tending to move the secondary jaw toward theprie mary jaw, a controller for the secondary jaw mounted on and moving with the thread holder member having one ond thereof operatively re-. lated to thev secondary jaw and having another endrearward of said stop for abutting engage:V ment therewith, said other end being held against said stop by the thread holder member when the latter is in forward position and said con troller being operative due to abutting engageav ment with said stop to overpower said resilient means and hold the secondary jaw spaced from the primary jaw, and said thread holder when moving to the rearward position thereof moving said other end of the controller away from said: stop and said resilient means moving` the secondary jaw toward the primary jaw.

6. In thread; holder mechanism for the weft ends extending from the bobbin magazine of a. weft replenishing loom, a stop forming part of the thread holder mechanism, a thread holder member mounted for movement onthemagaaine and comprising a primary thread engaging jaw xed tothe thread holder member and a secondary jaw mounted on the thread holder member for movement toward and from the primary jaw, resilient means. normally tending to Ymove the secondary jaw toward the primary jaw, a controller supported by and movably mounted on theV threadv holderr member having a partV thereof operatively connectedfto the secondary` jaw, a spring normallyholding the thread holder member toward thestop with another part of the controllerin abutting engagement with the stop and causing the first named part of the controller to act in opposition-to said resilient means to hold. the secondary jaw spaced from the pri-V mary jaw, and anactuator operative on a weft replenishing beat of the loom to move the thread holder member and controller away from the stop, said resilient means thereupon moving the controller relatively to the thread holder member andi moving the secondary jaw toward the primary: jaw.

7. In thread holder mechanisms for the weft ends of a weft replenishing loom, a stop forming part of the threadl holder mechanism, a weft end thread holder member which on a weft replenishing beat of the loom moves to a rearward position and thereafter moves to a forward position, said thread holder member comprising a primaryl thread engaging jaw xed to the member and a secondary thread engaging jaw mounted on the member for movement toward and from the primary jaw, resilient means normally tending to move the secondary law toward the primary iawto thread clamping position, a controller for the secondary jaw supportedk by and movably mounted on the thread holder member positioned for abutting engagement with said stop and held in such engagement when the thread holder member is in the forward position thereof and being effective due to said engagement to overpower the resilient means and hold the` secondary jaw spaced from the primary jaw; said thread holder member when moving to the rearward position thereof moving the controller out of abutting engagement with said stop to enableV said resilient means to move the ysecondary-jaw toward the primary jaw.

8. Inthread holder mechanisms for the weft ends of a weft replenishing loom, a stop forming part of the thread holder mechanism, a thread holder member for the weft ends which on a weft replenishing beat of' the loom moves to a rearward position and thereafter moves to a forward position, said thread holder member comprising a primary thread engaging jaw and a secondary thread engaging jaw movable toward and from the primary jaw, resilient means normally tending to movethe secondary jaw toward the primaryl jaw to thread clamping position, and a controller for the secondary jaw operatively connected to the latter and positioned for abuttingV engagement with the rear of the stop when the thread holder member is in forward position and effective due to a rearwardly dirooted force exerted on the controller by said stop-whenthe threadV holder member is in forward position to overpower the resilient means and hold the secondary jaw spaced from the primaryA jaw, the thread holder member when moving to rearward position reducing the rearwardly directed force exertedY by the stop on said controller and the resilient means thereupon moving` the ysecondary jaw toward the primary jaw:

9. In thread holder mechanism for the weft endsof a weft replenishingloom, a stop forming part of thethread holder mechanism, a thread holder member for the weft ends which on as weft replenishing beat of the loom moves to a rearward position and thereafter moves to a-forward position, said thread holder member comprising a primary thread engaging jaw'andA a secondary thread engaging jaw movable toward and from the primary jaw, resilient means normally tending to move the secondary jaw toward the primary jaw to thread clamping position, and a flexiblewire moving with the thread holder member and including a shield secured to the thread holder and a core slidable within the shield operatively interposed between the stop and secondary jaw effective due to a rearwardly directed force exerted on the core by said stop when the thread holder member is in forward position to overpower the resilient means and hold the secondary jaw spaced from the primary jaw, the thread holder member when moving to rearward position reducing the rearwardly directed force exerted by the stop on said core and the resilient means thereupon moving the secondary jaw toward the primary jaw.

l0. In thread holder mechanism for the weft ends extending from the bobbin magazine of a weft replenishing loom, a stop forming part of the thread holder mechanism, a thread holder member mounted for movement on the magazine and comprising a primary thread engaging jaw fixed to the thread holder member and a secondary jaw pivoted with respect to the thread holder member and movable toward and from the primary jaw, resilient means normally tending to move the secondary jaw toward the primary jaw, a flexible wire having one end thereof secured to the thread holder member rearward of said stop and having the other end thereof secured to the thread holder member adjacent to said jaws, said flexible wire including a flexible core slidable within the shield and having a free end projecting beyond said one end of the shield for abutting engagement with said stop and having another free end projecting beyond the other end of the shield for engagement with said secondary jaw, means acting on said thread holder normally urging said one end of the shield forwardly toward said stop and holding said one end of the core in abutting engagement' with said stop to cause the other end of the core to hold said secondary jaw spaced from the primary jaw, and an actuator operative on a weft replenishing beat of the loom to move said thread holder in a direction to move said one end of the shield and said free end of the core for engagement with said stop rearwardly away from said stop and thereby enable said resilient means to move the secondary jaw toward the primary Jaw.

11. In thread holder mechanism for the weft ends of a Weft replenishing loom having a selfthreading shuttle to be replenished by a reserve bobbin, the loom having a lay provided with la center lling stop motion fork, a, stop forming part of the thread holder mechanism, a thread holder member for said weft ends which on a weft replenishing beat of the loom moves from a forward position to a rearward position favorable for self-threading of the shuttle when the latter is picked subsequent to replenishment and thereafter returns to forward position to favor movement of the thread of the replenished shuttle under the filling fork, said thread holder member including a primary thread engaging jaw and a secondary thread engaging jaw mounted on the thread holder member for movement toward and from the primary jaw and having a tendency to move toward the primary jaw, and a controller for the secondary jaw mounted on and moving with the thread holder member and having abutting engagement with the rear of said stop when the thread holder member is in forward position and effective due to said engagement to cause the stop to exert a rearwardly directed force on said controller the effect of which is to cause the controller to hold the secondary jaw spaced from the primary jaw, the thread holder member when moving to the rearward position thereof moving the controller therewith and reducing said force to enable the secondary jaw to move toward the primary jaw to clamping position relative to the weft end and the thread holder member thereafter continuing to move to the rearward position thereof and moving the controller away from said stop.

12. In a thread holder unit for a reserve bobbin magazine provided with a pivotal support, an elongated thread holder member provided at one end thereof with a bearing for the pivotal support and having a primary thread engaging jaw fixed to the other end thereof and a secondary jaw mounted on the member for movement toward and from the primary jaw, resilient means normally tending to move the secondary jaw toward the primary jaw, and a controller mounted on the member for movement relative thereto having one end thereof for operative relation with the secondary jaw and having the other end thereof free for application thereto of a force in a given direction effective to cause the controller to move the secondary jaw away from the primary jaw against the action of said resilient means.

13. The thread holder unit set forth in claim 12 wherein the controller is a flexible wire comprising a shield secured to the member and a flexible core slidable in the shield.

14. The thread holder unit set forth in claim 12 wherein the controller is a lever pivoted on the member having `an arm for operative engagement with the secondary jaw and having another arm provided with said free end.

RICHARD G. TURNER.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,267,481 Turner Dec. 23, 1941 2,531,177 Turner Nov. 21, 1950 2,543,513 Turner Feb. 27, 1951 2,551,189 Wakefield May 1, 1951

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