US2744544A - Loom stop motion - Google Patents

Description

May 8, 1956 Filed Aug. 28, 1953 i M. R. FLAMAND LOOM STOP MOTION 2 Sheets-Sheet 1 IN VEN TOR. MAURICE R.FL.AMAND A TTORNEY May 8, 1956 I M, R, FLAMAND 2,744,544

' Loom STOP MOTION Filed Aug. 28, 1953 2 Sheets-Sheet 2 UNGROUNDED IN VEN TOR. MAURICE R. FLAMAND A TTORNE Y United States Patent 0 1100M STOP MOTION MauriceJR Flamand,CentralFalls, R. I., assignor to DraperfCorpora'tion, Hopedale, Mass., a corporation "ofMaine Application AugustZS, 1953, Serial No. 377,013

11 Claims. (CL 139-354) lhisinvention pertains to -'a stop motion for use with looms of the'typein which-a 'twisted selvage is applied :at at least one -'part of the fabricbeingwovenysaid 'stop motion beingefiective upon 'failure'of the-selvage threads employed for that purpose.

'lt is a general object'of the invention to devise a stop motion means of simple nature which shall function effectively upon each and all'of the selvage threads employed in making a so-calle'd twisted or Leno selvage :andwhich preferably, shall function through one of the co'nventional stopping means such as a warp stop motion :already to be found on-suchlooms.

It is a more specific'object of the 'invention to devise simple stopping means which shall, in effect, comprise a part :of the shedding means for these "'selvage threads and which shall 'not be 'afiecte'dbyeither the r'shedding 'oritwisting movement of the 'parts orthreads and which mayfunctionnponfailure of one: of the threads or upon a thread becoming unduly slack to'setin motion stopping "mechanism 'for :bringing "the loom to rest very rapidly and before the continued weaving "of any appreciable :amount- "of fab'ricwithout aselvage.

,It is 'a :further object .of the invention to "devise a .:selvage thread stop motion .Which; shall also serve'itonconttroliorlinfluence tensiontin lthe twisting .or Leno threads "thereby to improvetherquality 0f;the selvage.

'Other'objectS :of *the invention will become :apparent rfrom 1: the following a more detailed 'rdisclosure.

(Inc-certain types ofrloomsza naturalzselvagei is notreadily fform'e'd and fill such I looms, :projecting :weft threads mare iinterlocked or a .sortof-selvage is'formed "by separately ssheddingi'a .ipair 10f selva'ge threads and? by twisting :them for. imparting to'them somethingiin the nature of alLeno movement between -'each shedding "motion. :Ithas, rin amanyinstances, been thetpractice to'runsuch looms With- ?out any-stop motion for thesenselvage threads in which TEVCHL'lZht} .loom-operatorihas had to pay rather close :attention -tto each loom inorderxtoprevent weavin'g 'of :fabric :for :any appreciable "period of time withoutithe tloeking .of the 'l projecting :weft threads, that is, without :forming aselvage .at thatside of :the :fabric at 'which :2. selvage. thread has failed. 1-Insomeinstances the selvage i'threads;have been passed through the rregular warp stop :motionsaand :drop wires applied "thereto in a manner to-stop the loom in the event-one of the threadsrhas :.failed,:but thatrequires-positioning thesupply of selvage threads which :is preferably to be rotated, :adjacent "the :rearmost portion ofthe .loom :and at :a: considerabledisstance from the shedding andt-wisting-means atherefor, nth-at complicating the:mechanism,.making it ra'ther unrgainly .in itswappearance and design and in other ways being generally unacceptable.

Accordingito-the-instant invention, astopmotion efiecftivempon the-.failure-of anyone ofzthe .selvagethreads zserves tofunction 'preferably through theiregular waip stop. motion, to; stop the? 100m and: this mechanism actuuallyiormswa part of .arotatingdisk-structure for-she'dqding and twisting-the selvage threadsthereby adding. little .2 to the complication or bulk of-"the already existing 'mechanism. According to the invention, the intermittently rotating means by which the =se1vagethreads are "shed and by which they *are' twisted between 'each'shedding *movernent is provided with a 'spring biased arm, one for-eachof 'thethre'ads, which has its 'free end formed as-an :eyelet' for theithreading therethroughofthe selvage thread individual thereto. During 'normal operation 'of the mechanism "the tensionin the selvage threads is sulficient to maintain these arms ldrawn inwardly so they are .inelfective to stop theloom, but: upon failure of a selvage thread or undue sla'ckness therein, the "Spring arm or Spring biased arm isxadaptedtdmove 'outwardlytor to :aiposition more radially'zdirected relative to the disk to project fbeyond ithe'outeri periphery thereof for en- :gagernent with a "contacti'membemthereby ito complete .an electric circuit. .Such circuit 'completion is :prefer- :ably accomplished by :grounding through the *spring biased arm a'ndithence through-the'iassociated' 'parts and ;frame':of theloom.

i'lhesiarms, especially one form thereof, are adapted fiO :tension the: selvage threads acontinuously :so that they interloclothefprojecting filling under-more uniform con- :ditions.

Theinvention will be described in greater detail -by :reference to the-accompanying figures of drawing where- :m: I

rFig. .l sis a plan view of :a tselvage thread shedding and twisting mechanism-towhich theinvention 'hasheen applied. 1

Fig. 2 :is :a diagrammatic view showing the general of a partof the mechanism -whichgpertains to making electrical :contactv at the warp .stop :motion.

Now referringto Figs. .'l, :2 ?-and 3, Zthe invention appliesito a=selvage thread feeding-and.twistingzmeans which comprises a rotating disk 10 mounted on 'a :spindle :11 and *being a driven intermittently by certain gearing and :intermittentdrive means such as a-Geneva-movement, gpreferably enclosed within a casing :12. Rotating with -.disk10,'but preferably at :a uniform'speed,;is.a-selvage thread supply "means including disk 13, thread supplies -14 rand -15 from which the selvage Jthreads S are rcon- .ductedzfirstthronghthe hollow-interior of -a s pindle on which is mounted the'disk :13, then through -a similar hollow interiorportion of the intermittently moving "spindle.'-1 1. :Sotmu'chiofthe-mechanism is Well 'known and it i is tnot 'necessary to describe the 5 same here .in greater -.detail. ,The supply spools 214 and .15 are suitably :rertarded 580 that %they may .not roverrun rand furthermore, 'tensioningmeans may be-:employed on the :threads .as they. are drawn from .theseisupply :spo'ols.

As more! clearly illustrated-1m Fig. :2, :the selvage thread :.feeding :and twisting means is ;preferabl-yvlocated at the rear --.of thenormal-ishedding mechanismfor the :warp threads, butzforwardlynof the Warp beam and of the swarp stopzmotion generally indicated by numerals 16 iand 17. -The warp tthreads are drawn over the :nsual whip :roll .18 rand :then passed Zthrough v suitable tdrop wires 19, there being a plurality of banks of these wires, and then through the usual harness mechanism and reed 2i), whereafter they are interlaced with filling threads to form a fabric F which is taken up in a cloth roll 21 as is the usual practice.

The disk has mounted at either side of the spindle 11 on pivot screws 22 and 23, spring urged arms 24 and 25 having loops or eyelets of any suitable nature at or adjacent their ends through which the threads S are threaded after they emerge from the hub portion 26 of the disk, and are passed through loops or eyelets 27 and 28. After being threaded through the loops at the arm ends, they are passed through the feeding apertures or eyelets 29 and 30 formed in the disk itself. From these last mentioned eyelets the selvage threads S pass onwardly to be threaded through certain dents of the reed and cross at the fell of the forming fabric being shed due to the intermittent rotary movement of disk 10 which is timed to make one-half revolution every two picks according to a preferred selvage construction, although a change may be effected at each pick or each time the harnesses change, the effect of this intermittent feeding disk on the threads being such as to twist them each time a half revolution is effected. That binds in the end of filling and since the threads S are under suitable tension, a relatively tight and effective selvage is produced.

Now referring to Fig. 3, the pivot for one of the arms such as the arm 24 is shown in detail. The pivot screw 22 is threaded into the disk 10 which has a counterbored boss or hub 31 against the outer face of which the hub portion of the arm is adapted to bear and within which a spring 32 is fixed at one end in the disk and at its other end in the arm. This spring is under suitable tension to urge the arm in a direction outwardly or radially of the disk. threads S are drawn from their supplies is such that the arms will be held inwardly or adjacent the loops 27 and 28 so that the free ends of the arms may not project beyond the periphery of the disk. However, upon failure of one of the threads either due to a break or to loss of tension, the spring becomes effective for moving that arm outwardly to the dot-and-dash line position of Fig. 2, in which position it extends beyond the periphery of the disk 10 and is adapted to contact a rod 33 which is held at end support 34 and which is in turn electrically connected to one or more of the electrodes 35, one of each being evident at each bank of the warp stop motion. The rod 33 is insulated from the holder in which it is fixed, but connects by a lead 36 to a contacting clamp 37 at the electrodes of the stop motion. Thus current is carried to the rod which is insulated as are the electrodes. Grounding either completes the circuit. Actually the contact between an arm released by its selvage thread completes a circuit to set certain stop motion mechanism in action for stopping the loom, said circuit preferably being completed through ground since the arm is grounded through its disk and attendant mechanism to the frame of the loom, current passing through the electrodes 35, lead 36 and rod 33 to the released arm 24 or 25 as the case may be all in a manner presently to be described by reference to the diagrammatic Figure 7.

Referring to Fig. 7, one stop motion circuit which may be employed has been diagrammatically illustrated and the manner in which the selvage thread stop mechanism is adapted to function therewith is graphically shown. According to the broader concept of the invention, the selvage thread stopping means may be employed either as an independent stop mechanism or in conjunction with those stopping means already provided on the loom. Of course, the latter is more preferable in that less mechanism is involved and the existing circuits serve very well without the addition of any appreciable number of added parts. The particular circuit herein shown is described in greater detail in copending application Serial No. 336,280, filed February 11, 1953, now Patent No. 2,707,977. In

Normally the tension under which the selvage that circuit which is essentially a direct current one, alternating current is provided, preferably as transformed, ungrounded 12-volt source and is rectified by any convenient means such as the full wave, selenium type rectifier 38 the output of which is passed through a. feed line 39 in which is a resistance 40, the current then being branched to a power stop and a warp stop means. The power stop mechanism generally indicated by numeral 41 functions in a manner not necessarily to be described here, but through a holding solenoid 42 the coil of which is grounded at 43 and the other branch of which leads to electrodes 35 of the warp stop motion, this current being possible of grounding at 44 whenever a drop wire falls thereby to complete a circuit. The general operation of such warp stop motions is clearly understood and need not be described in detail here.

The added means involving clamp 37, lead 36 and rod 33 is effective to complete the circuit to ground at 45 whenever one of the arms 24 or 25 is released due to failure of its thread S. Thus it may be seen that the stop motion herein described and claimed and effective upon the selvage threads only, functions through the available stop motion circuit to stop the loom and thereby obviates any possibility of the looms continuing to run to weave fabric without a properly formed selvage.

While the description to this point has merely dealt with the stopping function incidental to the parts, the spring urged arms 24 and 25 exert a continuous tensioning force on the selvage threads S and always maintain them in taut condition. This tensioning force and drawback action are applied relatively close to the point at which the selvage is formed and have been found to be much more effective than tensioning means only applied back at the source of supply 14 and 15. The result is that more uniform tension conditions apply at the selvage and the actual product resulting is more desirable.

Now referring to Figs. 4 and 5, a modification of the invention has been illustrated wherein the arms pivoted and spring pressed outwardly on the disk 10 have themselves been formed as spring members and are very much lighter than the arms 24 and 25, Fig. 2, thereby reducing the effect of inertia and rendering the device more responsive to tension changes. Forces set up due to the mass of the parts subject to centrifugal force are rendered negligible so that the spring biasing means is accountable for virtually all of the action imparted to these members. Parts which are substantially identical with similar parts of Figs. 1 and 2 have been indicated by like numerals with primes. The disk 10' carries instead of the counterbored bosses 31 mounting bosses 46, Fig. 6, within which are retained shoulder bolts 47 held in place by nuts 48 and about the shanks of which are positioned the coils 49 of the spring-like ends of wire arms 50 and 51 the free ends of which have been looped as shown at 46' for the passage of a selvage thread. These spring arms are actually formed from as fine wire as is practicably to be utilized for the purpose and the inertia thereof is relatively insignificant compared to the force with which they are urged outwardly. Two holder studs 52 and 53 retain a bail or confining wire 54 which is not contacted by either of the arms 50 or 51 during normal operation of the parts, but which does serve to restrain them in the event some unusual forces or action may be experienced. The studs 52 and 53 may also serve as stop means for the spring arms which might otherwise move outwardly and then continue to swing about their pivot to a point where their ends would be shielded by the disk and thus assume a position in which they might not contact the rod 33'.

The rod 33 may be mounted as is rod 33 in the form of the invention disclosed and shown in Figs. 1 and 2. However, it is further contemplated that this contact member or red 33, also rod 33' of the modification, may be mounted on the casing 12 and current from the electrode or electrodes 35 connected thereto just as in the aconstrucltion-shown here, :thezadvantage .ofmounting .the :rod' on the casing [1 2 being: that zaidjnstmenttof .the .posi- .tion .ofathe warp .stop motion will then-havezno :efiect won the f position of .the rod. 'Of:course, .the rod must be insulated from the support.

According to theforms-of the inventioncdisclosed to -this.point,:a .contact made .at,-the rod by onetof the .out-

'9,thewarp stop motion mechanismlia's mountedithere- -onra :bracket or holder 55 which-.mounts pivots 56 and 57. At the first of these a wire formed to present two arms one of which is indicated at 53 and the other at 59 projecting from a central coiled part 60 is adapted to be swung on the pivot 56 being urged downwardly by means of a spring 61 to engage current carrying means such as the electrodes 35 of the warp stop motion. How ever, during normal operation of the mechanism, this two-armed, pivoted contact means is held out of engagement with the said electrodes by means of a detent 62 which is in turn a part of a wire member having a more or less laterally extending arm 63, both the detent and arm being extensions of a central coiled part 64 which is also freely pivotable on pivot 57. The detent tends to be maintained in position by spring 65 which is attached to the detent 62 at a central otfset part thereof and normally holds the laterally extending wire member 63 in its horizontal position, that is, in a position in which its laterally bent end 66 thereof will be contacted by one of the arms of the selvage thread stop motion when the latter is biased outwardly as above described.

In operation, this contacting means is normally set I manually as illustrated in these Figures 8 and 9, but is released when one of the stop motion arms engages the outer end 66 of arm 63 thereby disengaging the detent from arm 59 whereupon spring 61 quickly draws the contact member 58 downwardly onto the electrodes of the warp stop motion grounding the stop motion circuit through the bracket 55 and the frame of the loom. Thus it is not necessary to provide a ground through the selvage thread feeding means, although that is not particularly difficult, but this last mentioned system does function rather more directly to ground the current and thereby to complete the circuit for initiating the stopping action. It may also be mounted on the casing 12 rather than on the warp stop motion.

This description has so far dealt with electric stopping means, but, of course, the indication for stopping may become elfective through a mechanical stop motion such as the warp stop motion of U. S. Patent 1,924,790 or others. In that event, the wire arm 58 may fall into the teeth of the sliding bars of the stop means and then, in a known manner, may cause stopping of the loom.

While one embodiment of the invention and modifications have been disclosed, it is to be understood that the inventive concept may be carried out in a number of ways. This invention is, therefore, not to be limited to the precise details described, but is intended to embrace all variations and modifications thereof falling within the spirit of the invention and the scope of the claims.

I claim:

1. Ina selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, looms stopping means and other means rotatable with said member and feeding means and under control of the selvage threads for actuating said loom stopping means upon failure of a selvage thread.

:to prevent twisting .of the thread between the member and ,feeding meansyloom stopping means and other means carried bysand-rotatable :with said memberand .under .the .control of the .selvage :threads for actuating said 'loom stopping means .upon failure of a selvage thread. 3. In a selvage thread shedding and twisting means .for.looms whichincludesa rotating member cooperating with .a thread feeding-means rotating withsaid member .'to hpreventtwisting ofthe thread between themember .andieedingrmeans, 'loom stopping means and means continuously veifective' for independently sensing the confclition of eachto'f L'the selvage threads for actuating the loom stopping means upon an abnormalityin a selvage thread.

In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, loom stopping means and other means carried by said member, the position of which means is controlled by a selvage thread individual thereto, said other means being effective upon failure of its selvage thread for actuating said loom stopping means.

5. In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, loom stopping means and other means comprising spring urged, pivoted means carried by said member and through which a selvage thread is threaded for actuating said loom stopping means upon failure of a selvage thread.

6. In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, loom stopping means which includes a circuit completing contact member, and means rotatable with said rotating member and feeding means and normally maintained in position by a selvage thread individual thereto by movable to a position to engage said circuit completing contact member upon failure of a selvage thread.

7. In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, loom stopping means which includes a circuit completing contact member, and means rotatable with said rotating member and under the control of a selvage thread movable upon failure of such thread for grounding said member.

8. In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, loom stopping means which includes a circuit completing contact member and means for grounding said member which comprises a spring biased arm pivoted to said rotating member and through the free end of which a selvage thread is threaded, said arm normally being held in restrained position by its thread, but being movable upon failure of that thread to extend radially outward of the rotating member and to make contact with said contact member.

9. In a selvage thread shedding and twisting means for looms which includes a rotating disk cooperating with a thread feeding means rotating with said disk to prevent twisting of the thread between the disk and feeding means, a loom warp stop motion and means functioning to stop said loom upon failure of a selvage thread which comprises a circuit completing member forming a part of said warp stop motion and means for grounding said member which comprises a spring biased arm pivoted to said rotating member and through the free end of which a selvage thread is threaded, said arm normally being held in restrained position by its thread, but being movable upon failure of that thread to extend radially outward of the rotating member and to make contact with said contact member.

10. In a selvage thread shedding and twisting means for looms which includes a rotating member cooperating with a thread feeding means rotating with said member to prevent twisting of the thread between the member and feeding means, a loom warp stop motion and means for stopping the loom on failure of a selvage thread and for maintaining a uniform tension in those threads as they are incorporated in a fabric selvage which includes spring biased arms pivoted at said rotating member and having looped ends through which the selvage threads are passed.

11. Mechanism as in claim l0 wherein said arms are formed of spring wire thereby to reduce the mass of parts subject to centrifugal forces as they are moved with the rotating member to which they are pivoted.

Denmark Apr. 5, 1943 Denmark Aug. 23, 1943

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