Патент USA US2407774код для вставки
Sept. _17, ‘1946. ' N. FLETCHER 2,407,773 ‘WEFT TENSION FOR AXMINSTER LOOMS ' Filed Feb. 3, 1945 2 Sheets-Sheet 1 1/ .Sépt- 17,1945- 'N. FLETCHER ' 2,4@7,773 v WEFT TENSION FOR AXMINSTER LOOMS > Filed Feb. 3, 1945 ' 2 Sheets-Sheet 2 2,407,773 Patented Sept. 17, 1946 UNITED STATES PATENT OFFICE r‘ 2,407,773 WEFT TENSION'FOR AXlVIINSTER LOOMS Norman Fletcher, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application February 3, 1945, Serial No. 575,991 8 Claims. (Cl. 7139-123) 1 " 2 thread break, however, the whip stick will not This invention relates to improvements in weft be restrained by the weft or the tension and will tensions for Axminster looms and it is the general rise to an abnormally high position to close an object of the invention to provide a weft tension electric switch to effect loom stoppage. In this automatically controlled by the whip stick which way the whip stick serves not only to effect appli takes up slack in the weft. cation of tension to stop itself at the normal Axminster looms are customarily provided with raised position to permit continued loom opera a whip stick which takes up slack weft between tion, ‘but also acts upon weft breakage to stop the stationary package of yarn and the weft nee the loom. . dle for the purpose of keeping the weft taut. A With these and other objects in view which will tension device located between the whip stick 10 appear as the description proceeds, my invention and the weft package is usually under control of resides in the combination and arrangement of parts hereinafter described and set forth. a loom driven cam to apply and release tension at regularly recurring intervals during loom op eration. In the accompanying drawings, wherein a con The cam is usually so timed as to re lieve tension when the weft needle is being in serted into the shed and then apply tension when the needle is being removed from the shed.v By such an arrangement the tensioning mecha nism is under control of the loom driven cam with the result that if the loom should be stopped with the needle partly inserted into the shed the tension will be off and the whip stick can snap upwardly and create slackness in the weft. In wide looms which require the use of a long needle the eye end of the latter is subject to consider able vibration which may result in wrapping the weft around the needle should the latter come to rest during its insertion stroke. When the loom is again started up the weft breaks due to snarl ing at the needle eye. It is an important object of my present inven? tion to provide a tension which shall be under control of the whip stick throughout the loom operation and independently of the position of the needle. In this way I am able to make the operation of the tension conditional upon the po sition of the whip stick and dispense with the aforesaid cam and the several connecting parts between it and the tension, and I am also able venient embodiment of my invention is set forth, Fig. ‘1 is a diagrammatic view setting forth the relation between the fabric, the needle, the whip stick and stationary package of weft sup ply, together with my improved tension mecha 20 nism, . Fig. 2 is a front elevation of the needle rail and associated parts and having my invention ap plied thereto, ’ Fig. 3 is an enlarged front elevation of the 25 tension mechanism showing the same in the posi tion which it occupies when the needle is being inserted into the shed, Fig. 4 is a view similar to Fig. 3 but showing the conditions existing when the whip stick is 30 raised to its normal position, Fig. 5 is an end elevation looking in the direc , tion of arrow 5, Fig. 3, and Fig. 6 shows diagrammatically a circuit which can be used to effect loom stoppage. ' Referring to Fig. 2, I have shown a framework It normally extending'to the right of the loom designated at H. The framework ll] supports a needle rail 12 along which slides a carrier l3 to which is attached the needle N. Any ap to keep the thread taut during upward movement 40 proved driving mechanism for the needle may be employed, such as a cable l4 wrapped around of the whip stick should the needle stop while a drum I5 which‘ receives oscillating motion from a rack l6 and a pinion IT. The cable is‘ trained In Axminster looms it is customary to use a around pulleys l8 and is then attached to the weft guide near the inner end of the needle rail and associate this guide with a ?lling stop mo 45 needle carriage l3. During normal loom opera passing into the shed. tion the rack and pinion oscillate the drum l5, tion operative to stop the loom should the weft causing the needle ?rst to move into and then break. It is another object of my present in out of the warp shed, these movements corre vention to provide stopping mechanism which sponding to a movement to the left and then to Will be operated by the whip stick when the weft breaks. In this feature of my invention the whip 50 the right as viewed in Fig. 2. The weft W is supplied by a stationary package stick as it rises automatically effects application 20 and is led through‘ a tension mechanism de of tension to the weft with the result that the scribed in detail hereinafter and designated gen stick will stop at a normal raised position due to erally at T. From the tension mechanism the operation of the tension mechanism in holding the weft provided the weft is intact. Should the weft leads to an eye E in a whip stick 2|. A pair 2,407,773 3 , of eyes 22 of usual form are mounted on the in ner or left end of the needle rail as viewed in Fig. 2, and serve as guides for the weft W. It 4 from eye 40 to eye 4! must pass between the pads‘ 43 and 44 and be subject to any pressure which these pads may exert upon it. In order that the frictional force exerted by the pads 43 and 44 upon the weft may be varied, I employ a spreader arm 50 pivoted at 5! to the support 3| and having the end thereof remote from pivot has been customary in the past to associate the guides 22 with a ?lling or weft stop motion, but it will be understood from the following descrip tion that this stop motion may be omitted in asmuch as its function is performed by a part of my invention. 5! formed wedge shaped as indicated at 52, Fig. 5. A stud 55 on head 34 is spaced to the right of the Referring particularly to Fig. 1, the fabric F has right and left selvages S and S’, respectively,‘ from which extend rearwardly the binder warps _ axis of stud 33 and has pivoted thereto the upper end of a connector 55. The lower end of con nector 56 is pivoted to a second stud 57 carried by the spreader arm 50. B which form the shed. 'A selvage shuttle 23 of usual form is located at the left side of the loom When the whip stick is in its normally raised and cooperates with the needle N when the latter / position as indicated in full lines in Fig. 2 the is fully inserted into the shed to form the selv'a‘ge' ’ link 5'6 depresses arm 50 and moves the wedged ' is’. As the needle moves tothe left as viewed in , part 52 thereof downwardly out of operative rela Fig. l the weft which is attached to selvage S tion with respect to the pads 43 and 44. Under unwinds from package 29 and passes through‘ these ‘conditions the spring 46 pushes the plate tension T, eye E, guides-22 and to the needle N. 20 43 rearwardly against the weft, exerting a resist After the weft is caught by the shuttle 23 the needle N ‘is moved to the right during which ‘movement there is no need for additional weft.v ' ance to movement of the weft between eyes 40 and 4! dependent upon the amount of force exerted by spring 43. This is the condition which While the needle is being inserted into the shed exists ‘at the beginning of a weft inserting stroke ‘it places “the weft'W under considerable tension 25 of the needle, and as the latter moves into the with the result that the whip stick 2! moves ‘shed not shown and creates demand for ‘weft, the V down to the :dotted line position shown in Fig. 2, whip ‘stick will ‘move down because of the fact but upon withdrawal of the needle when the de that the weft is held ‘by the pads ‘43 and '44. As mand for weft has temporarily ceased the whip the whip stick descends, however, link '56 lifts stick rises to the normal raised position shown in arm at and causes Wedge encl 5.2 to enter be full lines, Fig. 2. tween the disks or friction plates and’ separate rThe matter thus far described of itself forms no part of my present invention ‘except as in- ' the latter by moving the front plate 43 forwardly against the action of spring ‘4%. ‘This removes dicated hereinafter- and may operate and be con the tension force on the weft and the latter structed in the usual manner. is free to move from the package '20 through the In carrying my invention into'effect I provide 'eyes 49 and 4-1 to the eye E of the whip stick and the needle rail "with a r‘earwardly projecting thence to the needle. So long as the needle con ‘st-and St to which is secured "an upright support tinues moving toward the left as ‘viewed in Fig. 1 '3! . This support is provided'withan upper bear vthere will be sufficient demand for ‘weft to main ing 32 in which is rotatively mounted a stud 33 40 tain the whip stick in down position and the the ‘forward ‘end of which has secured thereto tension will therefore be removed-from the weft. a head 34 to which the whip stick 2! is held by As soon as the needle comes to rest in the shed means of a clamp plate 35. An arm 1% ‘secured ‘preparatory to its removal the whip stick starts to ‘the rear end ‘of the stud 33 is attached to the :to rise vclue t'o operation-of spring 37!’, but in doing upper ‘end of ‘a tension ‘spring 3’! the lower end 4'5 so acts through connector 56 ‘to depress 'a-rmr5ll, "of which ‘is connected to ‘a lug 38 projecting rear whereupon ‘spring 46 moves friction plate 43 rear wardly from the support ‘3!. ‘The effect of the spring ‘3? is to ‘tend to turn the stud, head and whip‘ 'sti'c-k'in ‘a right hand direction as viewed in Fig. 3, but the spring will'yield to permit down ward movement of the ‘whip stick. “ Mounted on the supportv 3! are right ‘and left ‘guide eyes 4% and 4!, respectively, ' ‘preferably made of some wear resisting material, such as porcelain, and through which the weft‘W passes. wa'r'dly to ‘reestablish ltensioni-nglforce on ‘the weft. When this force reaches its maximum the weft is held "by the tension mechanism and further 0 upward movement of the Whip stick is ‘arrested. From the matter thus far described it will be noted that the tension exerted on ‘the weft by the pads 43 and 44 is conditioned in the sense that it is dependent for its operation upon the posi stick and not upon the position 55 tion of the of a regularly driven part acting in timed relation with the loo-m. It for this reason-that should the needle stop half way in the shed during ‘its A ‘stud '42 is mounted on and projects forwardly from the support 3'! and is surrounded‘ by front and ‘back tension pads or plates 43 and 44, re spectively, mounted loosely on stud 42. The rear inserting stroke the whip stick will immediately pad rests ‘against a boss 45 on the ‘support 3i, 60 rise and in ‘doing so will cause spring :46 to exert while the front pad 43 is 'slidably ‘mounted on a restraining force ‘on the weft, holding ‘the latter the stud 42 ‘but is‘ held normally in ‘rear position by ‘means of a compression spring 45 ‘located be taut and thereby preventing the ‘snarling which has existed heretofore in tension mechanisms de tween the front pad ‘43 ‘and an adjusting nut 41 threaded onthe‘s‘t'ud 42. Spring 46 normally pendent'uponacam. V . ' ‘ V 65 The second feature of v‘my invention ‘relates holds the stud 42 in the position shown in Fig. 5. to a stop mechanism operated by the whipstick A look nut 48 may be used to hold the nut 47 in and includes an electric switch 68 mounted on any adjusted position. The purpose of the spring ‘a horn 61 ‘extending upwardly from the support 46 ‘is to tend normally to move the plate 43 rear 3!. This switch has an arm ‘62 ‘which ‘is above wardly against plate 44, and by means of the 70 the ‘whip stick when ‘the 1atter is vin its normal nut 47 the force exerted by the spring ‘46 may be raised position. Under operation when the varied to alter the 'fo‘rc'e'exerted between the ad thread ‘is intact the whip stick rises and falls jacent faces of the pads 43 and '44. v without contacting the arm 62 due to the fact The eyes 49 and 4! and the pads are related that the tension mechanism is controlled by the as shown in Fig. 3 so that the weft in passing 75 Whip stick as the latter rises and ‘stops upward 2,407,773 6 and moving downwardly during weft inserting’ movements of the needle, tension means normally operative to prevent movement of weft from the package to the whip stick eye, and control'means ‘movement of the whip‘ stick before it strikes the arm 62, the far end of the weft being held at selvage S’. If, however, the weft thread should break at any point to the left of the'tension for said tension connected to and operated by mechanism as viewed in Fig. 1 it will reeve UK through the eye E of the whip stick and the latter will therefore be raised by spring 31 to an abnormally high position and strike arm 62 to cause closure of switch 60. ' Fig. 6 shows diagrammatically a loom control ling circuit which may be used with switch 60. A solenoid 10 is normally deenergized and per mits the shipper handle ‘H to remain in operat ing position so long as switch 60 is open. When the weft breaks and the whip stick rises to the dot and dash line position shown in Fig. 6 to close switch 60, current flows in the following cir the whip stick and operative when the whip‘stick moves downwardly to cause the tension to re lease the weft and operative when‘the whip stick returns to normal raised position to permit the 10 tension to reestablish normal holding relation cuit: transformer 12, wire 13, switch 60, wire 14, solenoid ‘Ill, and wire 15 to ground G, and thence back to the transformer through grounded wire 16. The solenoid thereupon moves the shipper handle] I to stopping position. From the foregoing it will be seen that I have provided a tension mechanism for the weft of an Axminster loom conditional for its operation throughout the loom cycle on the position of the whip stick and operated independently of any ship with' respect to the weft. - 3. In conditional weft tensioning and releasing mechanism for an Axminster loom having a whip stick through the eye of which weft extends from a stationary weft package to a weft inserting needle, the whip stick being normally raised " and moving downwardly during weft inserting movements of the needle, a tension mechanism comprising clamp members between which the weft extends, said clamp members being nor mally close together and operative to prevent weft from passing from said package to the whip stick eye, and control means for the tension mechanism normally out of controlling relation with respect to said clamp members but caused to separate said clamp ‘members by a force de rived from the whip stick when the latter de scends to permit weft to move from between regularly moving part of the loom, such as a ‘ said clamp members to the whip stick eye when cam. It will also be seen that when a demand stick moves downwardly. for weft is created ‘at the beginning of the needle 30 the4.whip In conditional weft tensioning and releasing inserting stroke the whip stick will be depressed mechanism for an Axminster loom having a and effect a simultaneous release of the tension, whip stick through the eye of which weft ex thereby permitting the weft to pass freely from tends from a stationary weft package to a weft the package 20 through the whip stick eye to the inserting needle, the whip stick being normally 35 needle. If the needle should be arrested while raised and moving downwardly during weft in moving into the warp shed the whip stick will serting movements of the needle, a tension mech be raised to take up any attendant weft slack anism comprising a pair of clamping pads be and in rising will apply a braking force to the tween which the weft extends from said package weft by means of pads 43 and 44. It will further to the whip stick eye, means normally holding be seen that the tension which is automatically 40 said pads against the weft ?rmly enough to controlled by the position of the whip stick op prevent said weft from moving from the package erates to stop the whip stick in its upward move to the whip stick eye, and control mechanism ment at a position just below the arm 62 of the operated by the whip stick and ‘effective when switch 60 when the thread is intact. If the said stick moves downwardly to separate said thread should break, however, the spring 31 will pads to permit weft to pass between them, said cause an additional upward movement of the control mechanism being moved out of control whip stick to cause closure of switch 60 to effect ling position with respect to the pads by the whip loom stoppage. stick when the latter rises to permit said means Having thus described my invention it will be to cause the pads to reestablish holding rela seen that changes and modi?cations may be 50 tionship with respect to the weft. made therein by those skilled in the art without 5. In conditional weft tensioning and releasing departing from the spirit and scope of the inven mechanism for an AXminster loom having a whip tion and I do not wish to be limited to the de stick through the .eye of which weft extends tails herein disclosed, but what I claim is: from a stationary weft package to a weft in 1. In conditional weft tensioning and releas ing mechanism for an Axminster loom having a whip stick through the eye of which weft ex tends from a stationary weft package to a weft inserting needle, the whip stick being normally raised and moving downwardly during weft in serting movements of the needle, 3, weft tension between said stationary package and said eye of the whip stick normally operative to prevent pas sage of weft from said package to the whip stick eye, and operating connections between the whip stick and said tension effective when the whip stick moves downwardly to alter said tension by a force derived from said whip stick and cause serting needle, the whip stick being normally raised and moving downwardly during weft in serting movements of the needle, tensioning mechanism comprising a pair of pads between which the weft passes from said package to the whip stick eye, a wedge operativ'ely con nected to and moved by the whip stick, and re silient means normally holding the pads in posi tion to prevent weft from passing from said ten sioning mechanism to the whip stick eye, said wedge effective when moved by downward move ment of the whip stick to separate said pads to permit passage between them of the weft and said wedge moving away from said pads when the tension to permit passage of weft from said the whip stick rises to permit said resilient means package to the whip stick eye. to reestablish said normal holding relation of 2. In conditional weft tensioning and releas said pads with respect to the weft. ing mechanism for an Axminster loom having a 6. In conditional weft tensioning and releasing whip stick through the eye of which weft extends mechanism for an Axminster loom having a from a stationary weft package to a weft insert ‘ing needle, the whip stick being normally raised 75 whip stick through the eye of which weft ex 2,407,773 tends from a ‘stationary weft package to a weft inserting needle, the whip stick ‘being normally operated by the whip stick and effective when the latter is in normal position to permit said tension mechanism to apply the ?rst named force to the weft and e?ective when the whip stick moves to operating position to move said tension mechanism by a force derived from said whip stick to said other position thereof to re lieve the tensioning force on the weft. movement to another position to permit passage 8. In conditional Weft tensioning and releas of weft from the package to said Whip stick eye, 10 ing mechanism for an Axminster loom having and means operated by the whip stick ‘effective a whip stick through the eye of which weft ex when the said stick moves downwardly to move tends from a stationary weft package to a weft said tension mechanism to said other position inserting needle, the whip stick moving from and effective when said whip stick rises to permit the normal position thereof to an operating posi said tension mechanism to return to said one raised and moving downwardly during Weft in serting movements of the needle, tension mech anism normally tending to occupy one position in which said tension mechanism prevents move ment of weft from said package to the whip stick eye, said tension mechanism ‘capable of position. ‘ 15 tion during weft inserting movementsof the needle, tension mechanism operative either to 7. vIn conditional weft'tensioning and releas apply resisting force to the weft to preventthe ing mechanism for an Axminster loom having latterfrom moving ,from the ‘package to the whip a whip stick through the eye of which weft ex tends from a stationary weft package to a weft 20 stick eye :or relieve said resisting force to permit weft to pass from the package to ‘the whip stick inserting needlegithe whip‘stick moving from the eye, and means operated by the whip stick as normal position thereof to an operating position the latter moves from the normal position there during weft inserting movements of the needle, of to the operating position thereof and :back tension mechanism when in one position apply ing suflicient tensioning force to the Weft to pre 25 to said normal position to control said tension mechanism to ‘effect application of said resist vent the latter from moving from said stationary ing force to the ‘Weft when the stickis in normal package to the whip stick eye, and said tension position and relieve application of said resisting mechanism when in another position relieving force ‘to the weft when the whip'stic'k is in said tensioning force to permit weft to pass from operating vposition. 7 said package to said ‘whip stick eye, and means 30 NORMAN FLETCHER.