US2609847A - Stop-motion for pile-weaving machines - Google Patents

Description

Sept. 9, 1952 KAHN STOP-MOTION FOR PILE-WEAVING MACHINES 4 Sheets-Sheet 1 Filed Dec. 30, 1949 FIG. I

INVENTOR. BfNJAN/N IMHN A TI'ORNf Y Sept. 9, 1952 B. KAHN 2,609,847

STOP-MOTION FOR FILE-WEAVING MACHINES Filed Dec. 50, 1949 4,Sheets-Sheet 2 2/0 FIG- 2 20 0.9

T /4 I46 226 06 I i 14/ 202 4 3 a 54 J00 INVENTOR.

200 BENJAMIN KAHN F/ G. If ATTORNEY Sept. 9, 1 B. KAHN $TOP-MOTION FOR FILE-WEAVING MACHINES Filed Dec. 30, 1949 4 Sheets-Sheet 5 N M a o R w mt v 2k w mw fiir WiIMII m gm 0 m W Q -31 6M1 5 ST W w .1 M w B +3 w W L IIIHIIIIIIIIIIUMH, 1 1 H QR NM 3.. mmn\%\w 5m mmm 3m NW, v w n3 1 -il! gw ut EN 3% A TTOR/VE Y Sept. 9, 1952 KAHN 2,609,847

STOP-MOTION FOR PILE-WEAVING MACHINES BfNJAMl/V I01 HN ATTOR/Vf) Patented Sept. 9, 1952 STOP-MOTION FOR PILE-WEAVING MACHINES Benjamin Kahn, Gadsden, Ala.

Application December 30, 1949, SerialNo.'135,877

The present invention relates to stop-motion 8 Claims. (01. 139-336) arrangements for looms adapted to weave terry or cut pile fabrics.

In my co-pending application Ser. No. 123,545 and which is now Patent Number 2,547,824, dated] April 3, 1951, filed October 26, 1949, I have disclosed a loom type machine of the character set forth above in which a reciprocable carriage, carrying a set of hooks, is periodically displaced from an inoperative into a thread engaging position in'which the hooks engage certain warp threads to draw them into loops, the latter being then firmly anchored in the fabric by oneor more traverses of the shuttle occurring while the carriage is retracted in inoperative position. In the particular form of machine disclosed, the carriage is normally held in its inoperative position by a retaining mechanism'controlled in suitable manner, e. g. from a dobbyeoperated harness lever, so as to, become momentarily inoperative in timed relationship with the movements of the lay or batten so that, during certain reciproca' tions of the lay, the carriage is enabled to. carry out a similar reciprocatory movement at the end of which it returns to its inoperative position.

In the prolonged operation of a machine of 1 this character it may happen that, owing to wear.

andv tear, failure of lubrication or other causes resulting in the accidental jamming of some part,

the retaining mechanism fails to respond prop-' erly to the operation of the controller and does not disengage the carriage. In such a case one or more rows of loops will be omitted in the pattern tobe weaved and, unless the irregularity is noticed immediately, a considerable amount of time and material may go to waste.

It'is, therefore, a primary object of the present invention to.provide, in a machine of the character described, means for arresting the machine whenever the sequence of operations referred to above is not properly carried out.

More generally, however, it is an object of this invention to provide, in a loom or related machine, means for stopping its motion (or giving any other desired indication) whenever a first movement, executed by a control mechanism, is not followed in due time by a second movement, executed by a follower mechanism, which is to occur before the movement of the control mechanism has been completed.

The invention will be described with reference.

to the accompanying drawing in which:

Fig. l is a. view similar to Fig. 2 of my aboveidentified application, representing a side-elevation of a loom provided with a stop-motion 2 arrangementaccording to the present invention, parts of the loom frame having been removed to expose the principal elements .ofxthe machine; Fig. 2 is a top plan view, on alarger:scale,l of

some of the elements shown in Fig. 1 h

Fig. 3 is a side view on the? line 3-3 "of Fig. 2;. Fig. 4 is a side elevation of oneof theswitchi'ng'ij devices forming part of the stop-motion arrange ment according, to the invention;

Fig. 5is atop plan view of the device'shownin" Fig. 4; i

Fig. 6 is an end view of the device illustrated" in Figs. 4 and 5, shown'in' normal or 'unoperated position;

Fi '7 isa View similar to Fig; 6, showingiithe device in oif-normal orjoperated position;

Fig. 8 is a side elevation. of another switching.

device forming part of the'stop-motion arrangement;

Fig. 9 is an elevation of the same device taken;

from the side opposite that of. Fig. 8; showing the device in cit-normal or operated position; i

Fig. 10 is a View similar to Fig. 9, showing the device in normal or unoperated position;

Fig. 11 is an end view of the device taken on the line I l--H of Fig. 10;

Fig. 12 is'a top view of the device in the osi-l tion shown in Fig. 9;

Fig. 13 is a circuit diagram illustrati ngthe electrical connection between the devices of 4-7 and 8-43, respectively; and

Fig. 14 is agraph showing the operation of-tliel two devices in timed relation to that of. other parts of the machine.

Referring first to Figs. 1-3, there is shown a machine 20 comprising a frame 2| whereon. are supported the various elements of conventional horizontal loom of the Northrop type, including the warp beam 22, the take-up roll 23, guide? rollers 24, 25,16, the 1ay 21 pivoted at 28, a set of dobbies (not shown) selectively controlling the 1 movement of various harnesses suchas shown at 31a, 3 lb, 3 [0 by way of wires 33a, 33b, 33c, respec tively, which pass over'rollers 34a, 34b; 34c and because well known per se. Fillings after having been turned into a fabric 38, around deflection roller III, guide roller 28 and deflection roller II2 to the take-up roll 23.

Secured to the frame 2! adjacent the ends of its breast beam are a pair of slide boxes or guides 4I, I4I within which move the slides 43, I43, respectively. Fig. 1 only shows the assembly 4I, I4I positioned to the left of the operator (who stands at the right-hand end of the machine as viewed in Fig. 1), the other slide box and slide, positioned to the right of the operator, being illustrated in Figs. 2 and 3. Each slide carries at its front end a bracket 45, I45, respectively, serving as an anchorage for a respective pair of springs such as 46, I48, I41, these springs having their other ends anchored to pins such as 48, I48, I49 projecting from the boxes 4I, MI. The tendency of these springs is to displace the slides rearwardly from the position shown in the various figures.

Each slide is provided at the underside of its rear extremity with a set of sawteeth 59, I59 cooperating with a dog 5!, I5I, respectively, the dog being pivoted to the associated slide box as shown at I52 for the dog I5I. A vertical rod 54, I54, slidably guided in a sleeve such as 53 which is secured to the frame 2|, is aligned with the rear extremity of the respective dog and has its lower end pivoted to a lever such as 55, rotatably held in the frame 2I by a stud 58. A spring 51, anchored to the frame 2I at 32, tends to maintain the left-hand end of lever 55 (as viewed in Fig. l) and, with it, the rod 54 in a raised position in which the top of the rod abuts the dog 5|, thereby positively maintaining the latter engaged with a pair of teeth 59 after the slide 43, in a manner subsequently described, has been brought into the position illustrated against the action of its springs; it will be understood that an identical arrangement, not shown, holds the rod I54 in the raised position shown in full lines in Fig. 3, thereby also maintaining the dog I5I engaged with a pair of teeth I59. 7

The two rods 54, I54 are adapted to be periodically depressed, against the action of spring 51 and its companion spring (not shown) associated with rod I54, by means of cams such as 6I which are mounted on a shaft 89 and co-operate with lever 55 and its companion lever. not shown. Motion is imparted to the shaft 69 by means of a cylinder or pulley 64 fixed to the shaft and having the end of a wire 86 wrapped around it, this wire passing around a guide roller 67 as well as a guide roller 58 and being fixed to a special dobby-operated harness lever or similar timing means, not shown, so as to be tensioned at predetermined intervals. A torsion spring 59, wrapped around the shaft 60 and fixed thereto at one end, is anchored to the frame M at 63 and tends to restore the cams to the position illustrated in Fig. 1 after they have been displaced therefrom by the action of wire 66 to effect the descent of rods 54, I54.

Bridged across the rear ends of the two slides 43, I43 are a pair of parallel beams 63, 59 which together with these slides form a reciprocal carriage generally indicated at 15. The inner or rear one of these two beams, beam 69, carries a hook bar I0; each slide further carries at its rear end a lug II, III, respectively, these lugs forming an abutment for a pair of plates such as I2 mounted on the forward face of the lay adjacent the two ends thereof. The positions of these lugs on their slides are adjustable by .The threads 990, which may be somewhat heavier than the ground warp 99a, 99b and which are supplied by separate spools or the like, not shown, enter between the feed roller 83 and the presser roller 84, thence pass around rollers I8 and TI which cause them to travel along a short horizontal run in which they traverse the eyes of individual riders I8, and after passing around roller 85 and guide rails 89 enter the heddles of harness 3Ic. These threads, therefore, form part of the shed 99 previously referred to.

The riders I8 form part of a stop-motion arrangement for the pile warp which does not form part of the present invention and has been described in detail in my above-identified application.

Mounted on the shaft 9| of feed roller 93 is a gear 92 which meshes with another gear 93 mounted on a stud shaft 94. A plate 95, loosely pivoted on the stud shaft 94, carries a pawl 96 which is pivoted to the plate at 91. Pawl 98 co-operates with a ratchet 98, fixed to the stud shaft 94 so as to be rigid with gear 93, and is held in contact with the teeth of the ratchet by means of a spring (not shown). The end of roller 83 opposite gear 92 is embraced by the jaws of a brake member 80 which is pivoted to the frame 2| at 88 and frictionally engages the roller 83 to prevent overrunning and maintain the threads 990 at a certain tension.

Pivotally secured at IIlI to the plate 95 is a bent rod I09 having its other extremity fixed by a nut I93 to an upstanding portion of bracket 45. Forward displacement of the slide 43, resulting in a movement of rod I toward the right asviewed in Fig. 1, will thus swing the plate counterclockwise around the stud shaft 94, thereby imparting a similar movement to the ratchet 98 and the gear 93, this in turn resulting in a clockwise rotation of gear 92 and roller 83.

The hook bar I9 carries a set of hooks I95 each having a shank I95 through which pass the mounting bolts I97 securing the hooks to the bar; each hook also has a bill I98, lying in the plane of the shank I99, and a fin-shaped part I89 extending perpendicular to that plane, all as clearly seen in Figs. 2 and 3. It should be noted that this form of hooks is shown merely by way of illustration and that they ma be replaced, for example, with any of the hooks disclosed in my co-pending application Ser. No. 129,573, filed November 26, 1949.

The operation of the mechanism so far described is as follows:

Let us assume that, after the formation of shed 99 and the insertion of a filling I III in the usual manner, the lay 27 has just moved into its forward (vertical) position indicated in dot-dash lines in Fig. 1. This movement of the lay causes the plate I2 and its companion plate, not shown, to impinge upon the lugs II, III, respectively, an action which slightly displaces the carriage I5 toward the front and momentarily release the dogs 5I, I5I from the grip of teeth 50, I59. Owing tether-presence; f1.I'Qd$;54';.x|54, however;; these ddgszwill fremainzir'r: the position showncin: Figs; 1 and;:.3,-; .whereupomtheilay returns to itsyposition shown", infull :lines 1hr :E'ig..: .1. This cycle; therefore, constitutes the. ordinary :weavinguoperation in: whichamwett thread ;is.s thrown. across raised. and: lowered: warp; threads. which .2 includes: the.

During; a; subsequent cycles of operation, in which theeharness. 3 l"ccwi l=l' "be:inrraisedtpositiomi the :pile warpv threads? 90c: will; have i been positioned in the-paths of movement-oi respective" hooks I05. Let us assume that in this particular cycle a..roweofloopscare. to. be. formed; Anshort time'wbefore pthe lay 2 1:: again :reachesrits ivertical position-,c. the. controhnrechanism: including wire fifigsshafitzBU; cam 16 t randlever fiirwillhavei caused the: rods .54; .1 5'4 toodescendi into .the: position indicated'. in dot-dash: lines forithe: rods] 5.4 (Fig.::3)..

Whenenow; the lay-again strikes th'e'lugs 1 I, [11,.

the dogs 5|, IE! will be: released anchibystheinowna weight; will dropinto the;position:showniimdotdash: lines forthe: dog:.l M (Fig. 3?).Lin which they IESt SOIILrtOD Ofi their; respective rods; Now; as

the-laycrecedes,-. thevcarriage. T151Wi11 *follow it on.

time-the-Wire: 6 Bhasbeen released. and: the torsion spring 59 hasrestored" the cams. on shaft'ifiil to the position of Fig. 1.. When, therefore, thecarriagesl5ihasrarrived in its forward: positionspring 5T fanditsxcompanion spring: cause the. rods 54,. l Eltoiorcethe dogs. 51:, I 51 *into. engagement with the-teeth; oftheir; respectivexsli'des; so. thatithe.

carriage .15 will be retainedqin::thatiposition: duringfthefollowing. cycle or cycles-of:operatiorrduring whichathe:loops.;.previously formed will be firmlyanchored to the. body of the fabric...

When the carriage flirfirst. followed the lay- 2;?

on its. rearwardiswing, the. rod l00iwas displaced.

in such; a sense:..asr to: cause (the .pawl .96: to. pass over a; number of teeth;:of ratchet"98;" thisnumher being preferably: adjustable by' varying. the

distance of :the .pivot' [0i .from theshait .94: On the... restoring: (forward) movement of :the. car'- riage;.during; which the: loops are @form-ed;.the' rod:

lllfl isiwithdrawn and rotates the .plate. 951m such a sense..that:the..paw196= Wil1 d-isplace the elements 98, 1 93; 92 and 83.byan' angledetermined bythe numberzof .ratchetteeth previously skipped; thereby imparting th'e'desired slack to the threads 900; The amount: of thisslackshouldwbe rogue latedgini accordance with the length of :the loops,-

the latter being adjustable b changing theposi' tion ofithe lugs Hynl ontheislides 43,- M3.

The: problem whichl have setout to-solve by. my present .lIlVEIltiOIL is how to stop: the machine ortin some 110171181? manner attract the attention of theioperatorr'it; if ;for:some-reason; the car-; riage-"ISE-iails to leave its: forward position. :after the rodsidg I54 have disengaged the dogsS-t, 151. For thispurpose-I provide a pai-r ofswitching devices; generallyindicated at200 and-300;w-hich are" respectively controlled by thecarriage I5 (formingpart of the follower mechanism) andby the control mechanism previously referred to In theparticular-embodiment illustrated; device 200 (Figs.l.2, 3) co-operates with the slide i lt while device 300.. responds to the operation. of .rod 54. Device. 200 issecured. to. the. slide box MI by an arm, 20! whilevdevice;.300:-ismounteddirectlnom the frame 21 adjacent the rod 54. 1

Referring to. 3 Figs. 2&7 for. a: detailed descripe;

tion of the .switchi2i00g1 it i will be noted. thatithee latter comprises: a. vertical supporting-plate 12021 attached, by meansaof screws. 203, to. the armr20l .2

An inclined. arm 204 extends: upwards. from the; plate 202. and iroms. arest .for the horizontalwlegzc of an. angle. memberr205a. which is: urged by; 3,? spring .206, secured to. thewplate 2021 by auscrew:

2 01,: toward the armi20 l, this: member beingpiw oted to plate 202.at 208 The: vertical leglof meme ber'2051has insul'atedly mounted'thereon a may-:-

able contact blade 209 which cooperates with a similar,.stationary blade 2 l0,tthe.1atter beingirr sulatedly secured: to. a vertical. arm 2| I extending i from: theplate 202. As clearly seen' in Fig.4, blade 209: is held onstheimember 205 by means of a bolt 2 l 2'," insulated from the blade by a. dielectric sleeve" 213, and is clamped between a pair of insulating washers 214, 215; Similarly, the .blade 210i is clamped between washers Z [6; 2| l' byameans of a bolt 2 i8.

Suitableuterminal .1 tags 219; 220 areprovided on thelextremities of blades 208; 210, respectively,

to which are connected the ends of leadsor wires The pivot 208ifor the member 2.05 is represented by alrod which anchored in two short lugs 223g 224. risingfromthe plate 202. The extremity of rod' 2 08 lopposite angle member 205 carries "a nor-- mally horizontal arm 225, extending parallel to the horizontal leg of member 205; andbothcf" these horizontal elements support a cam bar-226 extending paralleLtothe rod: 208;: It willbenoted from Fig. '7 that the blades 209, 210, which-are normally in conductive contact with each-other,

cantbe separated: by a raising of cam bar'226 whichxcauses angle member-205 to rotate about" the rod 208. against theaction: of its'restori'ng' ner previously described-the pin229-engagesthe curved forward extremity 230 of cam-bar 226; thereby raising thelatter'as illustrated iii-Figs: 3

and From Fig. 3, wherethe pin 229 has been shown in dot-dash lines in its extreme'rearward' position, it will be noted that the bar- 226 is "long' enough to stay raised -as-1ong as the-pin isoff normal, sethat the contacts 209; ZI-Owiliremain open until the carriage ha-s ret-urned to its inop erative=positiont Turning now-t0 Figs. 8 -12-for a description of device:30lJ;-it will be-seen that a body-memberiifll, secured by screw. 302" to the frame 21, carries a fixed horizontal-contact arm 3 03' and a movable" contact arm 304 pivoted to the member 30'i at 305; Pivoted to the fixed arm 30s at one is swingable lever-30 provided at itslower extremity with a transversebar 308; the latt'er'formingjan.

abutment-forthelay'2'! (seeFigs; l and 10).

Each of the arms 303', 304. carries a respective contactblade 309,. 31 0 which are normally out of engagement with each other, corresponding to the.

position of arm w t-illustrated in. Figs. 8;. 10 and 11.

This position. of the. movable arm 304* isw. brought about by'the lay21 which,:engagingthei.

bar 308, causes the upper extremity of lever 30? to coact with the cam-shaped underside 3!! of arms 304 111 such a manner that the latter will be swung clockwise, as viewed in Figs. 9 and 10, if the contacts had previously been in the closed position shown in Figs. 1, 9 and '12. Arm 334 is provided with a boss 312 co-operating with a spring-pressed pin 313, lodged in a bore 3M of body 33!, to index the arm 3% either in its opencircuitor in its closed-circuit position; the bore 314 accommodates. the spring 313 which is held in position by a threaded plug 3w. A spring 351, anchored to the 'member'3fll at 3&3, passes around the pivot 305 and engages the lever 33? to urge the latter into its normal position, shown in full lines in the several views, after displacement thereof by the lay 2? into the position indicated in dot-dash lines in Fig. 10, which displacement serves totrip the arm 3% into its open-circuit position.

Each of the contact blades 339, 3E3 is provided with a respective tag 3|9, 323 to which the leads or wires 32l, 322 are connected. The blades are fastened to these arms in insulated relationship,

in similar manner to that described for the blade 209, by means of bolts 323 and 324, respectively, and washers 325, 326 and 321, 323, respectively.

The rear end of arm 334 is recessed to form a shoulder 329 against which abuts the forward face of a spur member 339, the latter being pivoted to the arm 394 at 33l and normally held in contact with the shoulder 329 by a spring 332 which embraces a stud 333 on the arm 3%. The spur portion of this member extends into the path of a collar 333,-secured to the rod 54, which is normally above the arm 3% as shown in Fig. 1 and in full lines in Fig. 10. When this collar descends with the rod ti l into the position shown in dot-dash lines in 10, it will displace the spur member 330 against the action of the relatively weak spring 332 without displacing the arm 304 from its normal position in which it is held by the coaction between pin 3 l 3 and boss 3 i 2. On the subsequent rise of the rod 33, however, the collar 334 engages the spur member 333 from below, causing it to bear upon the shoulder 329 and thereby effecting a rotation of the arm 36 3 into its alternative position in which its contact blade 3H3 touches the stationary blade 333, thus closing a circuit Which is not opened until the lay 21 displaces the lever 33? in the manner previously described.

As illustrated in the circuit diagram of Fig. 13, the contacts 233, 2M and 3539, 3H1 are connected in series with each other and with the winding of a relay 335. Motor 35 is energized from a main power supply 336 in a circuit which includes break contacts 337 of relay 335, the energizing circuit for the motor including anauxiliary source of current 338 as well as the leads 222i, 222, 32! and 322. Thus it will be seen that simultaneous closure of both sets of contacts will cause the relay 335 to operate, breaking the energizing circuit of motor 35 and arresting the machine.

Turning to the timing diagram of Fig. 14, curve 2'! denotes the reciprocations of the lay (upper peaks indicate forward position), curve '15 denotes in similar manner the displacement of the carriage by and in step with the lay, curve 53 denotes the rise and fall of rod 53, curve 360 indicates the periods of closure of contacts 339, cm and curve 233 similarly indicates the period of closure of contacts 253, 2H3; finally curve 335 denotes the operation of the relay of Fig. 13. Several cycles of operation are indicated by the intervals A, B, C, D and E. Thus,

in the interval B, there occurs a normal operation of the loop forming mechanism, initiated by a descent of rod 54, followed by a movement of the carriage (the striking of the carriage by the lay during each cycle being represented by the low peaks '15) which causes the switch 20!] to open before the switch 398 closes its contacts,

' and ending with the re-opening of switch coning in the energization of the relay 335. The circuit of motor is now opened at contacts 331 and the machine comes to a stop.

It should be understood that the invention is by no means limited to precise form or mode of application described and illustrated; on the contrary, it is capable-of numerous modifications and adaptations as well as use with other types of machinery Without departing from the scope and spirit of the invention as defined in the objects and in the appended claims.

I claim:

1. In a loom, in combination, a reciprocable lay, a reciproca ble carriage, retaining means normally holding said carriage in an inoperative position remote from said lay, control means periodically inactivating said retaining means in timed relationship with the movement of said lay, operating means effective upon inactivation of said retaining means to displace said carriage in the direction toward said lay to an operative position, return means including the lay effective upon displacement of said carriage to return the latter to said inoperative position, a first switching device actuated by said carriage to assume an ofi-normal position as long as said carriage is displaced from its'said inoperative position, a second switching device actuated by said control means to assume an off-normal position subsequently to the beginning of the normal displacement of said carriage, restoring means operative prior to the normal return of said carriage into said inoperative position to restore said second switching device to its normal posi tion, a motor controlling the movement of said lay, and circuit means for stopping said motor, said circuit means being rendered efiective only in the normal position of said first switching device upon said second switching device simultaneously occupying its said elf-normal position.

2. The combination according to claim 1' wherein said control means includes a control member moving in one direction to inactivate said retaining means and subsequently moving in the opposite direction to return said retaining means to the active position thereof prior to the return of said carriage to said inoperative position, said control member displacing said second switching device toward said off-normal position thereof upon moving in said opposite direction only.

3. The combination according to claim 2 wherein said control member comprises a rod provided with an abutment, said second switching device comprising a movable arm provided with an extension displaceable relative to said arm, spring means tending to maintain'said exr tension in a predetermined position relative to said arm, said extension in said predetermined position projecting into the path of said abutment, and stop means limiting displacement of said extension relative to said arm in the direction induced by movement of said rod in the direction of the latter for returning said retain ing means to its active position.

4. The combination according to claim 3 wherein said movable arm carries a first contact element, said second switching device further comprising a second, stationary contact element engaging said first contact element only in said off-normal position of said second switching device.

5. The combination according to claim 1 wherein said first switching device comprises a movable arm, said carriage being provided with cam means displacing said movable arm upon displacement of said carriage from its inoperative position.

6. The combination according to claim 5 wherein said movable arm carries a first contact element, said first switching device further comprising a second, stationary contact element engaging said first contact element only in the normal position of said first switching device.

7. The combination according to claim 1 wherein said restoring means is actuated by said lay.

8. In a loom, in combination, a reciprocable movement of said carriage toward operative position, restoring means operative prior to the normal return of said carriage to its inoperative position to restore said second switch to open condition, a motor controlling the movement of said lay, and circuit means for stopping said motor, said circuit means being rendered effective only when said first and second switches are simultaneously closed.

* BENJAMIN KAHN.

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

UNITED STATES PATENTS Number Name Date 905,131 Bacon Dec. 1, 1908 1,812,206 Hindle et a1 "June 30, 1931 2,499,887 Sullivan et al on Mar. '7, 1950

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