US1872979A - Selvage trimmer for box looms - Google Patents

Description

Aug. 23, 1932. C, R KRONOFF 1,872,979

SELVGE TRIMMER FOR BOX LOOMS Filed June 17 1931 2 Sheets-Sheet l bo 1E J l 69 FIL-r. 5 55 nmfentor' @arence R .Kronoff A Qttornag s Aug. 23,1932.V C, R, KRNOFF y 1,872,979

SELVAGE TRIMMER FOR BOX LOOMS .Filed Jun 17, 1951 2 Sheets-Sheet 2 mfentor @avenue RKronoff Patented Aug. 23, 1932 UNITED STATS PATENT oFvFicl-i:

CLARENCE R. KRONOFF, OF WORCESTER, MASSACHUSETTS, ASSIGNORTO CROMPTO & IKNOLIESY LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS Application filed June 17,

This invention relates to improvements in selvage trimmers for drop box looms and it is the general object of the invention to improve these devices so rthat the usual form of lay may be employed at the drop box end of the loom. y

y In drop box looms there are employed two or more shuttles of which one is active and the remainder inactive. In order that weaving-'may continue when an inactive shuttle is returned to action it is necessary that the weft ends be anchored at some point', and this ordinarily the selvage of the cloth in the usual form of dobby box loom. If a shuttleremains inactive lfor a large number of picks andthen returns to action it forms a loop which must later be trimmed.

When a shuttle moves down to inactive po,- sition there Vis a chance that its weft end will extend across the race of the lay to be broken by the active shuttle. In order to prevent this breakage it is customary either tol omit the box mouth from the lay and make it a part of the shifting shuttle boxes, or, `if a box mouth is employed on the lay, it is open at the front so that the weft end can extend from the selvage down infront of the lay to the idle shuttle beneaththe cloth without ,v extending across the race.

Where a clamp is employed to hold the weft of an idle shuttle it is desirable' that it be placed as near the shuttle boxes as possible so as not to interfere with varying widths of clothwoven in the loom. It will means for confining the thread to azone of small compass which will permit the use of a comparatively small clamp and at the same time permit the location of the clamp at a point substantially remo-ved from the selvage and in the vicinity of the Vshuttle boxes.

SELVAGE TRIMMER FOR BOX LOOMS 1931. Serial No.l545,0/10.

front of the lay and so located that a thread extending from it to the-idle shuttlev will 'have no vopportunity to fall on` the'shuttle race. The distance between the breast beam and the lay when the latter is in its extreme forward position on certain typesv of looms does not permit the mounting of the clamp on the lay in such a position thatit will always hold the weft ends in front ofthe lay. It is accordingly a further object of myinvention to mount the clamp independently of the lay so that the same may be locatedl relatively close to the lay whenv thelat'ter is in front position, but movable forwardly relatively to the lay so as toprevent the weft ends roo from falling on the shuttle race during the time that the lay is in picking position.- One form of' my invention is adaptable to looms where the minimum distance between lay and breast beam does not require arear move- 'ment of the clamp relatively to the lay, in vwhich case the clamp is given a rearward movement each piel. v

Because of the varying widthsfof thereeds used in loom lays and the consequent uncertainty as to whether suliicient room behind the reed line will be available forthe movement of the clamp transverse of the lay, I prefer to use a clamp which moves ina plane parallel to the loom reed. -As the lay moves IOV rearwardly the weft endv assumes a diagonal 'position with respect to the lay, thus comingf "f within the range of the clamp. The clamping is preferably operated after the active shuttle has been picked so as not to catch the thread of the active shuttle. I

It is a further object of my `invention 4to y provide a pair of thread engaging fingers or the like which will swing to a position from the selva-ge toward the boxes to engage the weft thread of an idle shuttle and bring the same within the field rof action of the clamp. The anglewhich is defined by theVV upwardly and' `downwardly extending threads has its .vertex at the selvage and the lingers extend one above and the other below the cloth so as to locate the idle weft between them and the path of movement of the clamp preferably covers a Zone which is Vsomewhat larger than the distance between the two fingers.

l/Vith these and other objects in view which will appear as the description proceeds, myv

invention resides in the combination and arrangement of parts hereinafter described andv set forth in the claims.

In the accompanying drawings, whereina convenient embodiment of my invention is set forth, v Y

Fig. l is a diagrammatic view of a. loom showing the various parts of my invention applied thereto, the preferred forni of cam being shown,

Fig. 2 is a detailed front elevation `of the drop box end offthe loom taken in .the direction of arrow 2, l, and showing the .clamp open,

is' an end elevatioirtaken in the .direction of arrow 3, Fig. 2 showing the mangner in which the fingers control the weft,

.,Fig. 4 isa vertical transverse section' Vner. of operating the'weft lingers `by the clamp., and y Fig. 7 is a detail diagrammatic view showing a modified form ofv cam to be used when vthe clamp moves rearwardly each pick of theloom.; Y I f Referring to; the drawings, Ihave shown a loomframe 10 having a lay l1 and a breast `beam'lQ. The usualbottom shaft is shown'at v13, while the connections between the lay and the` top shaftftogether -with the latter `are abovev or below vthe race plate.

omitted. The lay carries box guidesone of which' is shown `at 14 to receive a gang of boxes l5 shown herein as havingA fourcells 16, v17, 1 8 and 1,9, respectively. The drop boxes are raised and lowered by mechanism notshown but well understood in the art-so .that any one of the four cellscan be movedto picking position in alignment with the vrace plate20 ofthelay. .y During operation of the loom the shuttles Vwill be .called into. action .one after'another depending upon the pattern, certain 4of the shuttles Valways* being idle and located either It s to be ,understood with reference to Fig. l that the lay moves'back and forth. between the full and dotted line-positions and that the shuttle y is pickedwhen the lay is about midway between these positions and moving rearwardly.

v A s shown in Fig. 5 the cloth C hasa 'fell F which is formed by the reedR of the loom.

When the lay is on front center or vin its extremeforward position the wefts will assume the position shown generally at W in Fig. 5, whereas when the lay is in its extreme rearward position the threads will Aassume a l more oblique position'such as indicated at W in the same figure. The matter thus far ,describedis comino in bex'loomsgand of vitself forms' no part of Vmy lpresentV invention. Y

y-e'ect `I provide two separate mechanisms-one ofi-'which is a thread placerto act on the weft vends extending from the se'lvage to the idle shuttles .to` cause said weft ends to pass through a relatively small area at a point consiy era'bly removed from the selvage, and the :other mechanism being a clamp tohold the weft ends afterthey'have beenso placed. The threadpiaeer comprises an uprightV shaft rotatablymoun'ted in vafpair of spaced .vertically aligned bearings Sland 32 which may be held in any approved manner .to the loom frame. A collar `33 is secured to the shaft and ieceives..one .end 'of a twistV spring 347 the other end of which is received by the top bearing 3l.' The effectof saidspring is to .turn the shaft in a right hand or Clockwise direction as viewed inl Fig. 5. To the Vupper end of this shaft is secured a head 35 from which project upper and lower fingers 36 and 3 7, respectively. These fingers lie oneabove and the'other below the cloth C and are limited in their forward movement by athreadcutting templeT which engages one or the other vof saidffingers,preferably the upper one. v

sliownin F ig'.r 2 vtheang'le rwhich is defined by Vthe w eft ends extending to the extrenieupper and lower positions has its .vertexI between the fingers so that no matter "what angularfposition the weft end may assume with respectv to the cloth' andthe lay it will start from a .point which is vertically betweenthetwofingers;l Therefore, as the latter swing from the full tothe dotted line (position shown in Fig. 5, the' 'thread of .the

previously active shuttle will be engaged by one or the o .therfof the fingers, depending upon the. .direction `of. shift Aof the shuttle boxes.` As shown in Fig.'2 an upwardly: e`xtending thread is kmovedffrom the position shown aftA in full lines to that shown at B in ydotted linesand itis to be understood thatfa 'similar bend or' *deflectionr would be Yproduced inthe weft of any'shuttle regardless of the "direction yin which ithad been moved from active position. #The second mechanism constitutes a clamp and includes a'. bell. crank lever 40 pivotally movable about afixed axis 4l held in lany approved manner to theI looniframe. A link cani 47 of preferred 'form by meansof a ...11

ies

. secured to the rodreceives the downward l'ies las thrust of a compression spring 55 the edect of 'which is to lower the rod so that a second collar 56 also fixed to the rodiwill engage the lower bearing and actas afstop to limit downward movement of the rod 53. The upper end of the rod is formed as arack 57 which meshes with a small pinion 58-secured to a clamping blade'59 and movable about an axis'60 secured to the lever arm 50. f

As shown in Figs. 2, 3 and 6 lprovide the arm 50 with a clamping 'surface' 6l and mount on the arm a yielding clamping element 62 which defines with the surface a notch for the reception of the Sciamp-59- The members 61 and 62 extend vertically and below the lower linger, but I claim no novelty for the specific form of these members. TheV lower end of the rod has a laterally extending foot 63v which is adapted for engagement with a trip 64V secured to the loomside.

In operation, when the lay is in forward position on front center as shown in full lines in Fig. 5, the twist spring 34 will `hold the fingers 36 and 37 in their forward position and the clamp will be as near thev lay as convenient to permit the latter to approach the breast beam. lvVhen. the parts `are in this position the weft W will extend across `the shuttle race or top of the layfrom the'selvage toward the active shuttle.` As the lay moves rearwardly from the full toward the dotted line position shown in Figs. l and 4 the boxes will complete their shifting movement, carrying the previously acting shuttle either to a position above or below the shuttle race 20. During this backward movement the clamp will also start to move rearwardly, but at a slower rate than does the lay, to permit the arm 50 to engage and impartmovement to the fingers and turn4 them rearwardly against the action of spring 34 without requiring the rear ends of said fingers to engage the reed.

After the active shuttle has been picked the thread placing fingers and ,clamp may move rearwardly at the samerate as does the lay, or at any other desired rate..` The preferred form of the cam .is so timedas to cause engagement of the foot 63 with the trip 64 during the backward movement of tlie clamp after the active shuttle has been picked so that the only thread extending from the adjacentselvage is that leading to the idle shuttle. The resultant downward molvement of the clamp toward the'members 61 j p y temple will cut that part of the weft `extendand 62 takes place while the thread is in tof spring 34.,

diagonal vposition indicated in dotted lines at'W in Fig. 5, and in full lines in Fig.'y 6,

softhat although saidc'lamp' moves ,inla plane substantially. parallel to the lay the thread will neverthelessbe disposed obliquely with respect to said clamp and be actedupon by the' latter. The range"V of movement 'of the clamp extends preferably above land below the fingers36 and 37.. As soon as the thread has'been 'moved between the membersl and -62'bythe clamp it will be held by said mem-l bers so that subsequent removal of the blade 59 will not `withdraw the thread. I

During the forward movement of the lay Y' full line position shown-in Fig. '2. Duringv forwardmovement of the lay the lingers 1- will also be moved from the dotted to the full line position shown in Fi g. 5 by the action Itis to be understood that the turning movement of the fingers about their vertical axis is due vto engagement of the lever 50 with one of said fingers as indicated in Fig. 6,

land it is further to be understood that cam 47 can be shaped to produce the movements already described in connection with the clamp. It is alsoto be understood that-the "active shuttle is on the drop box side of the loom only onalternate beats and it istherefore sufficient to `have the motions already described in. connection with the fingers and "clamp take place only on those beats of the Vformed as to delayrearward-movement of. the clamp on that'pick of the loom when the shuttle leaves thedrop boxes not only for the purposes already described, but also to pers lmitthe-active shuttle to pass to the right of the cutting templeV as viewed in Fig. 5 before the fingers are projectedacross the path ofv the shuttle.

. One important advantage to be derived from delaying rearward movement of the Vclamp vas the lay moves backwardly is to draw the thread from the clamp to a position forwardly of the shuttle race, so that said thread may move downwardly into the space 7 5, see Fig. 5, should the active shuttle be shifted downwardly. Subsequent passage of the active shuttle over the shuttle race will there# yfore not abr'ade the weftfend extending from the clamp to the idle shuttle.

iso

l5 v Y I' ment of the cloth said fend the retainer .62 `when ,clamp moves forvvardly.w V 1 When a shuttle which has; previously been rendered idle returnsto action its weft ,end isattached to theclamping member and weaving may -therefore conti-nue, this end' extending from the clampv toward the cuttingtemple after the shuttle has entered the shed sothat during `.continued forward movewill also be cut by the vvtemple cutter.

When' it is desired to have-the clamp move i y.rearwardly eachpick of the loom, the cam may be employed having two Ysimilar rises l V8l, :1s-shown ,in the modification illustrated in Fig/7.

From the have provided a selvage trimming device inf iclu'ding two separate mechanisms one of which lplaces'the thread ina comparatively restrictedV or narrow `zone or area so that it can be acted upon by the other or clamp-ing mechanism, the point of clampingbeingremoved from the lselvage a considerabledisvtance so that cloths of 4varying widthsv can be woven on the sameloom .without disturbing ,the mechanism. It will also be seen that the two mechanisms are so constructed that a Weft-endcan extend downwardly infront of ythe lay through the opening 75 when a shuttle isshifted lfrom active position downwardly vto anA idle .posit-ion, thereby preventing abrasionby an idle shuttle. f It will furthermore seenthat the vthread placer and cla-mp maybe controlled by their operating cam so `asto move rearwardly only on those-beats of the loom` when there a weft end extending .from the selvag-e l toward the shuttle boxes, the devices bei-n g in normal forward position when the shuttlesarrives inthe drop boxes to' beoiit. of the path of saidshuttle. By mount- .i-ng the mechanisms independently of the'lay lI amenabled to gain theadvantage ofa shuttlemoi-ith on the lay so far as positioning fof the thread is concerned-without having the disadvantage incident to a fixed. .shuttle mouth on Sthe lay. f

Having thus described my invention it will be seen that rchanges and modifications may vbe madel therein by thoseskilled inftheart withouftdeparting `from the spirit and scope of the invention and Idonot wish-to belimlited to the details herein disclosed, but what cutting temple, shifting'A shuttle boxes'movabile vertically on the lay and each capable Yof being .in idle'. position, a Vthread placing foregoing it will v.be seen. .that IY neva- 979 mechanism normally in retracted position adjacent the selvage, a clamp mechanism mounted independently of the lay and mov.- ,able rearwardly in-.a plane parallel to ythe pla-nein which'the lay moves, and means to move the placing mechanism from the temple toward the boxes lto place the weft of an idle shuttle within the range of movement of theclamping mechanism.

`a, lay movable back and forth and a thread 2; In a selvage trimmer yfor a loom having 575 cutting temple, shifting shuttle boxes movable vertically on the lay and each capable, of being in idle position, a weftiend clampto seize the thread extending from the selvage to .an idle shuttle, anda thread placerrmovable fromthe selvage to the clampto place the thread into `operative relation vwith the clamp prior to operation of the latter.

. 3. In a selvage trimmer. for a loom having 185 a lay movable back and forth and a thread Vcutting temple, shifting shuttle boxes movv able vertically on the lay and each capable of being inidle position, a' weftend clamp invdependentof vthe *lay movable rearwardly being in idle position7 a weft clamp mounted Aindependently of the lay, means to move the clamprearwardly -to clamping position after the lay has reached picking :position in its rearward movement, and a thread placer to move from the selvage toward the shuttle boxes to move a weft end extending from the vselvage cutter to an idle shuttle in the range .of operationsl ofi the clamp.

5. In a selvage trimmer for a loom having a breast beam and a lay movable towardand from the breast beam, a set of shifting shuttle boxes ont-he lay Yeach capable of being in idle position, a clamp independent of the lay and located between the latter and the breast beam, means to hold the clamp stationary during the latter part of the movement of the lay 'toward the breast beam, vother'means tov move the clamp Vfrom the breast beam toward the` lay when the latter has passed picking position, and a thread placer movable from the selvage toward the boxes to place the weft of an idle shuttle in operative position relatively to the clamp.

6. In a selvage trimmer for a loom having abreast beam and a lay movable toward fand from the breast beam, a .set of shifting shuttle boxes on the lay each capable of being in idle position, a clamp independent of the lay and CLARENCE R. KRONOFF.

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