Dec. 10, 1946. 2,412,477 v. F. SEPAVICH PULLOVER SHAFT DRIVE FOR'AXMINSVTER LOOMS Filed Jan. 19, 1946 ‘ ‘MIG-DIM‘(52-)’ , 2 Sheets-Sheet 1 5-9-61.“ VIIIIIIIIGI-Y-W . INVENTOR VICTOR F. 5'EPAVIOH. _FIE. if gem/nMe-j ATTORNEY Deco 10, 1946. I v. F. SEPAVICH ’ 2,412,477 PULLOVER SHAFT DRIVE FOR, AXMINSTER LOOMS Filed Jan. 19, 1946 2 Sheets-Sheet 2' ' INVENTOR v/c: TOR r‘. SEPA wow FIG. 1 ATTORNEY Patented Dec. 10, 1946 2,412,477‘ UNITED STATES PATENT OFFICE 2,412,477 PULL-OVER SHAFT DRIVE FOR. AXMINSTER LOOMS Victor F. Sepavich, Worcester, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application January 19, 1946, Serial No. 642,294 17 Claims. 1 (01. 139-7) 2 This invention relates to improvements in AX minster looms and it is the general object of the invention to provide improved means for oper The fabric F leads forwardly from the Warp threads W which de?ne the shed for the Weft needle N. The tube frame conveyor system des ating the pullover shaft by which the tube frames ignated generally at C is supported by an over are moved one by one to transfer position. 5 head structure including horizontal runs [5 and Axminster looms ordinarily operate with a IS on which are mounted sprockets 57 around tube frame conveyor system Which is advanced which extend the endless tube frame transport in part at least by a pullover shaft operated ing chains l8 and I9. Tube frames 29 extend by a pawl and ratchet mechanism. Because of between the chains and are provided in the usual the nature of the pawl and ratchet mechanism manner with spools 2 l to supply the tuft yarn 22. it has been necessary in the past to employ very At each side of the loom there is located a strong brakes which of themselves impose a transferrer arm for detaching the tube frames considerable load on the moving means for the one at a time from the chains and moving them conveyor system. toward cloth forming position. In Fig. 1 the It is an important object of my present in right hand transfer arm is indicated at 2'5 and vention to eliminate the pawl and ratchet feed a rocking rod 25 is provided to give the tube mechanism for the pullover shaft and in its place frame its usual rolling-in motions. Rod 26 is substitute motor driven mechanism geared to operated by a lever 2'! and link 28 connected to the shaft. The motor is caused to operate dur~ a lever 29 positioned for cooperation with a cam ing that part of the cycle of the loom in which 30 on the loom shaft 3L Rising and falling the pullover shaft is moved angularly, after which movements of the transfer arm are effected by the motor serves as a lock to hold the pullover rod 32, lever 33 and a second cam 34 on shaft 3!. shaft stationary. The motor alternately turns The lay L and weft needle N have operative the pullover shaft and then locks it electromag movements every beat or pick of the loom. netically. This result I accomplish by using a In operation of the loom, and assuming that motor having a wound rotor the windings of three-shot Axminster fabric is being woven, the which are connected together when the shaft .is bottom shaft 3! will rotate once every third to be turned, and are then connected directly to the power lines which feed the stator when the shaft is to be locked. In addition to the motor drive for the shaft I beat of the lay L, and the needle N will be in serted into the Warp shed each beat or pick of may also use a second motor for the conveyor system and control it simultaneously with and in the same manner as the shaft motor is con trolled. With these and other objects in View which will appear as the description proceeds, my in vention resides in the combination and arrange ment of parts hereinafter described and set forth. In the accompanying drawings, wherein a con- k venient embodiment of my invention is set forth, Fig. 1 is a partial side elevation of an Ax minster loom having my invention applied thereto, the loom. During the tuft forming operation the transfer arms will detach the tube frame in trans fer position from the chain, move it down to cloth forming position, roll the tube frame, and then lift the frame a slight distance to pull off yarn for the next tuft forming operation. The cutter blades l l and I2 then sever the tufts from the tube frame and the transferrer arms there after move upwardly to return the tube frame to the chain. This tuft forming operation will oc cur every third pick of the loom, and when it is completed the transporting conveyor system will advance to move the next tube frame to trans~ fer position. Advance movement of the chains is e?ected Fig. 2 is a detailed front elevation looking in 45 by means of a pullover shaft 40 which is jour the direction of arrow 2, Fig. 1, naled for rotation in stands secured to the upper Fig. 3 is an enlarged front elevation looking part of the loom frame and one of which is in the direction of arrow 3, Fig. 1, showing the shown at M. Each end of the pullover shaft switching mechanism for the motor, Fig. 4 is a detailed vertical section on line ll—4 of Fig. 3, Fig. 5 is a side elevation looking in the direc tion of arrow 5, Fig. 3, parts being in section, Fig. 6 is a vertical section on line 6—5 of Fig. 5, and - Fig. '7 is a diagrammatic View showing the mo tor controlling circuits. Referring particularly to Fig. 1, the frame of the loom is indicated at I0 and the front and back tuft cutter knives at l l and 12, respectively. has secured thereto a sprocket wheel similar to that shown at 42 in Fig, l for moving the con veyor chains. Except for certain features of the pullover shaft pointed out hereinafter the matter thus far described is constructed and operated in the usual manner. In carrying my present invention into effect I provide separate motor means for rocking the pullover shaft 4% prior to a tuft forming oper ation and then holding it or locking it electro magnetically in stationary position during the 2,412,477 3 tufting operation. Accordingly, a motor M of the wound'rotor alternating current type having three windings a, b and c is mounted on a bracket 45 secured to the loom frame and has a pinion 45 meshing with a gear ill’ rotatable on a sta tionary stud 48 supported by the bracket 45. A second pinion £19 fast with gear 4'! meshes with a second gear 59 which is secured to the pull over shaft iii. The reduction gearing between. the motor and shaft llil is such that a given nume- - ber of rotations of the motor produces the re quired angular motion of the: shaft. to. move. a new tubeframe to transfer position. The shaft 3! has secured thereto the switch ing devices for controlling the motor M. These switch devices are designated at I, II and III and; since they are alike only one of: them will be described‘ in detail. A disk 6.9‘ of electric current conducting ma terial is secured to a bushing Bl made of insulat ing material and pinned as at 62 to the shaft 3! so that the disk ESQ-is insulated from the shaft. ‘ a ' ‘ “ 4 ings, and this in turn is determined by the posi tion‘» of arms 73. Under these conditions the rotor will turn so long as the shaft 3| is in position to keep brushes Si in contact with strips ‘66, and motor M will act through its. reduction gearing to turn the pull over shaft‘. Contact strip 65 is of such length that the pullover shaft will be turned the proper amount ‘to-advance the next tube frame to trans fer: position. As the shafts 3i‘ and 46 turn together the brushes 8|. will eventually leave the contacts 66 and the windings are no longer connected to each‘ other through shaft 35. Brushes M will then engage the periphery of the disks 68, where upon the windings of the rotor will'be' connected through their Wires 85, 85' and 8? to the’ disks: 6% and brushes 951‘ to power wires NH, 1G2. and»: W3. Under this condition the’ windings a, bland c are connected directly across the» same feed curedv thereto an arcua-te peripheral plate 65' of electric insulating material to which is secured an electric current conducting contact strip 65 concentric with the peripheral surface 6? of the wires which supply the rotating ?eld: of the stator, and the rotor will be magnetically locked‘ in a stationary position. This'locking- continues until brushes ii again engage contacts 65. The transfer arms operate during this period of lockL ing and assurance is given that the tube- frame will be properly returned to its chains‘ after the disk. ' The‘contact strip'?'d is therefore insulated tuft forming operation. The disk‘ hasv molded therein or- otherwise se The speed of the rotor will be determined by from the disk but is secured to it and turns-with: 30 the amount of resistance which is inrseriesiwith it. its winding and in order that this speed‘ may be Disposed laterally on the disk 60 is a resistor accurately adjusted the contact. ar-ms ‘iii-are made element ‘iii mounted on an insulating arcuate base ‘H secured to the disk ‘(it as at '12. A con tact arm ‘ll-f3 is positioned, for engagement with the’resistor and is- held‘in adjusted angular posi tion on and in electric contact with the shaft 3| by a- clamping set screw 15. The» resistor lilris electrically connected tocontact strip 66 by wire or conducton it‘ so that brush 8!. is connected angularly adjustable as already described; The gear reduction between the motor M and’ the‘ pullover shaft is so proportioned and related to the rate of turning of, the motor that the period‘ of contact between the brushes 8i and the con tact strip 65 will be just sufficient to cause the aforesaid given number of revolutions of the mo‘ through part of the resistor to shaft 3 l. whenever 40 tor and give the pullover shaft its requisite the brush engages contact 56. Extending parallel to the shaft 3| is a rod- 80‘ held in fixed position on the loom and support~ ing a brush 35 for engagement with the periph- ' ery 6'3’ of the disk 59v and the contact strip: 65. An- insulated, holder 32- for the brush is. secured to rod 80 and keeps the latter out of electric connection with the brush. The brushes 8! of the. units‘ I, II and III are connected by wires 85, 8t and‘ Sito the- three windingsa, b and-c, respectively,. of the rotor R of the motor’ M. Each unit includes a holder 90. clamped to rod 80 by a screw 9!- and- provided with a shank- 92., made of insulating material and holding a: support 93 for a brush as which is in: continuous electric. contact with the left side of disk til, see Figs. 3 and 6. The brushes Ski» of the units I; II and III are connected by wires 95, 96 and 91; re spectively to'the main power lines i?l, m2 and H13‘ which supply three phase alternating elec tric current. amount of angular movement to move the next. tube frame into transfer position. As already mentioned, the conveyor system C can if desired bev driven by a motor additionalto that provided for the pullover shaft. Such a mo tor is shown at M’ in Fig. l. together'with ap propriate gearing for driving. the chains !8 and i9. The motor M’ is similar to motor M and is mounted on a stand, HE‘ forming part of the: overhead mechanism l5 and has a pinion. l-ll' meshing with a gear H2. rotatable on a bearing H3. A second pinion iléi rotating with’ gear H2 meshes with a. gear H5 securedto a shaft HB rotating in bearings l H on the’ structure 15. sprockets I Hi similar to sprockets Q2. are secured to shaft H6 and advance the chains whenzmotor M’ runs. The gear reductionsare the same 111 each case, so that whenever motors M and. M’ run simultaneously the chains will be fed: con~~ tinuously by power supplied to them at two spaced points. In Fig. 7' the rotor R’ of the motor M’ is-pro Referring, to Fig. '7 and assuming that the vided with windings a’, b’ and c’ which are conloom has-reached a position where it is necessary nected by wires I29, I21. and l-ZZ to wiresii?, 8t. to start~ an angular movement of the pullover 65 and 87, respectively. By. these: connections the shaft, shaft 3i will have turned to a position such rotors of the two motors are always in thesame that brushes 8| will contact the strips 55. Wind ing alwillthen. be connected by wire 85 and its condition so that when the pullover shaft is being br-ush?i through that partfof the corresponding its part of the conveyor system, and when, the rotor of motor M is magnetically locked there will be‘a similar. locking of the rotorR’. Con duits I25 and I25 are provided to hold‘-wires.con- resistor 'lil between conductor T6 and arm 13 to shafts! . Similarly, windings b and 0 will also be connected to shaft 3!, and since all the windings are.‘ thus connected together the rotor will turn. The rate of turning will be determined by the amount of resistors it in circuit with their wind moved by motor M, the. motorv l ' will advance necting the motors with. the switching uni-ts; I wish it to be understood, however, that I am not 75 restricted in thepractice of my invention to the 2,412,477 5 use of the second motor M’, nor am I to be lim constitute an electromagnetic lock preventing ited to the particular showing of the overhead ' motion of said rotor and said part of said system. 4. In an Axminster loom having a tube frame mechanism as set forth in Fig. 1. From the foregoing it will be seen that I have provided an electric motor connected to the pull over shaft of an Axminster loom and controlled transporting system part of which has periods of activity for advancing tube frames alternat ing with periods of inactivity during which the in such manner that the motor alternately turns tube frames are detached one at a time from and electromagnetically locks the pullover shaft. the system, a multiphase alternating current This result is obtained by using a wound rotor electric motor having a rotor capable of turn and connecting its windings together preferably 10 ing and also capable of being electromagnetically through speed regulating resistance means to locked against turning, and control means for cause turning of the rotor when the pullover said motor causing said rotor to turn to cause shaft is .to be turned, and then connecting the said part of the system to have periods of activity windings directly to the same line which feeds and causing said rotor to be electromagnetically the stator of the motor so that the rotor is elec locked during said periods of inactivity. tromagnetically locked against turning. Any 5. In an Axminster loom having a tube frame slight angular shift between the rotor and the stator during the locking period will be greatly minimized by the reduction gearing between the motor, and the pullover shaft and the conveyor chains will be held in correct position for registry transporting system part of which has periods of activity for advancing tube frames alter nating with periods of inactivity during which the tube frames are detached one at a time from the system for a tuft forming operation, a pull over shaft geared to said system, an electric motor operatively connected to the shaft in such manner that the shaft and motor turn together and are at rest together, said motor capable of with the tube frames when the latter are returned to the chains subsequent to a tuft forming opera tion. Also, an additional motor M’ similar to motor M may be used to drive the chains at points spaced from the pullover shaft. I do not claim the broad feature of two motors to drive the conveyor system except as these motors alter nately move and electromagnetically lock the system. being electromagnetically locked against turning to hold said shaft stationary, and control means for the motor causing the latter to run to cause said part of the system to have said periods of 30 activity and causing said motor to be electro Having thus described my invention it will be seen that changes and modi?cations may be made therein by those skilled in the art without departing from the spirit and scope of the inven tion and I do not wish to be limited to the details herein disclosed, but what I claim is: magnetically locked during said periods of in~ activity. 6. In an Axminster loom having a tube frame transporting system part of which has periods of activity for advancing tube frames alternating with periods of inactivity during which the tube 1. In an Axminster loom having a tube frame transporting system part of which has periods of activity for advancing tube frames alternat ing with periods of inactivity during which the frames are detached one at a time from the sys— tem for a tuft forming operation, a pullover in) tube frames are detached one at a time from the system, a part moving in timed relation with the loom, an electric motor operatively connected to also capable of being electromagnetically locked, said part of the transporting system, and electric and control means for the motor causing the latter to run to turn said shaft during said pe riods of activity and effective to lock said motor control means for the motor operated by said sec ond named part and causing said motor to run to cause said system to have said periods of activity and causing said motor to stop to cause said sys electromagnetically against turning during said periods of inactivity to prevent turning of the tem to have said periods of inactivity. 2. In an Axminster loom having a tube frame transporting system part of which has periods of activity for advancing tube frames alternat ing with periods of inactivity during which the shaft for said system to be turned during said periods of activity and to be held at rest during said periods of inactivity, an electric motor geared to said shaft and capable of running and u (l shaft. 7. In an Axminster loom having a tube frame transporting system part of which has periods of motion for advancing tube frames alternating with periods of rest during Which the tube tube frames are detached one at a time from the frames are detached one at a time from the sys system, an electric motor operatively connected to said part of said system and constructed to be capable of running or being electromagnetically locked against motion, and control means caus tem for a tuft forming operation, a multiphase electric motor provided with a stator connected to a source of multiphase electric power, a rotor for the motor having windings and operatively ing said motor to run to cause said system to connected to said system, and control means for have said periods of activity and causing said motor to be electromagnetically locked against motion during said periods of inactivity. said windings effective during said periods of motion to connect said windings together to cause turning of the rotor and effective during said periods of rest to connect said windings to 3. In an Axminster loom having a tube frame transporting system part of which has periods of activity for advancing tube frames alternat ing with periods of inactivity during which the tube frames are detached one at a time from the said source of multiphase electric power and j cause the rotor to be electromagnetically locked against turning. 8. In an Axminster loom having a tube frame system, an alternating current motor having a transporting system having periods of motion stator and a rotor provided with windings and alternating with periods of rest, a multiphase operatively connected to said part of the system, 1, electric motor having a stator connected to a and electric control means for said windings ef multiphase source of electric power, a rotor for fective to cause the rotor to turn to cause said the motor operatively connected to said system system to have said periods of activity and effec and having windings, and control means for tive during said periods of inactivity to cause said windings to connect the latter together to said windings to cooperate with the stator and cause turning of the rotor for periods corre 2,412,477 spending to said periods of motion and also ef fective to connect said windings to said source 8 operative under one conditionto :run and ‘cause of multiphase electric power for periods corre sponding ‘to said periods of rest to lock said said shaft to turn and operative under another condition to be electromagnetically locked ‘to prevent turning of the ‘shaft, and electric .con rotor electromagnetically and prevent move trol means for said motor e?ective between suc cessive tuft forming intervals during loom ‘oper ation toecause said motor to be under said one transporting system having alternating periods condition and effective during said interval to of'motion and rest, a multiphase alternating cur cause said motor to be under the other of said rentelectric motor operatively connected to the 10 conditions to prevent movement of the shaft said system in such manner as to be required to during tuft forming intervals. turn during said ‘periods of motion and being 14,.111 an Axminster loom having a pullover required to beat rest during said periods of rest, shaft to move tube frames one at a time to ‘trans said motor being so constructed that it can be fer position, said shaft requiring a given angular caused either to run or ‘be electromagnetically movement to move .a tube frame adjacent to locked against running, and control means for transfer position into transfer position, an elec said-motor causing the latter to run to effect said tric motor operative alternately to turn and stop periods of motion of the system and also cause turning of said shaft, resistance means connected said motor -to be electromagnetica'lly locked to said motor when the latter "is turning said against motion to effect said periods of rest of shaft, and means to vary said resistance means said system. to cause an amount of turning of said motor 10. In an Axminster loom operating with a which will produce said given angular movement pullover shaft to move tube frames one at a time of the shaft. to transfer position, unitary means operatively 15. In an Axminster loom having an operating connected to said shaft in such manner as to be 25 shaft which turns continuously during loom op capable of alternately moving and locking said eration and having a pullover shaft to have in shaft, said unitary means comprising an electric termittent periods of angular motion to move motor capable in one condition of running and tube frames one at a time to transfer position, capable in another condition of being electro an electric motor operatively connected to the magnetically locked, and means controlling the 30 pullover shaft, and control means moved by the motor and causing the latter to be under said operating shaft and causing said motor to have conditions alternately. intermittent periods of operation to cause said .11. In an Axminster loom having a pullover pullover shaft to have said intermittent periods shaft to move tube ‘frames one at a time to trans of angular movement. fer position, unitary means for alternately mov 35 16. In an Axminster loom having an operating ing and locking said shaft including an electric shaft which runs continuously during loom oper motor capable of running in one condition and ation and having a pullover shaft having inter capable of being electromagnetically locked mittent periods of angular movement to move ment of said system. - ' 9.111 an Axminster loom having a tube frame against motion in another condition, driving tube frames one at a time to transfer position, an gearing between the motor and the shaft caus ing the latter to move when the motor runs and be locked against motion when the motor is elec over shaft to cause angular movement of the tromagnetically locked, and electric control means for the motor operative during loom opera tion to cause said motor to be ?rst under one of said conditions and then under the other of said conditions. 12. In an Axminster loom having a pullover shaft to move tube frames one at a time to trans fer position, transfermeans to move a tube frame - electric motor operatively connected to the pull latter when the motor is running, and control means for said motor moving with the operat ing shaft and effective to cause the motor to run for a given part of a rotation of the operating shaft corresponding to a period of angular move ment of said pullover shaft and effective to pre vent turning of the motor for the remainder of said rotation of the operating shaft. 17. In an Axminster loom having an operating away from the shaft and then return‘ the tube shaft which completes a, rotation in a cycle com frame to transfer position during a tuft forming prising a plurality of beats of the loom and in intervai, an electric motor ,operatively connected cluding a tuft forming period, a pullover shaft to to said shaft and capable of being under two con move tube frames one at a time to transfer posi ditions in one of which said motor runs to turn tion between tuft forming periods, unitary means the-shaft'and in the other condition of which the including a motor operative to'turn said pullover motor is electromagnetically locked to prevent shaft when the motor is under one condition, said turning of the shaft, and electric control means motor when under anothercondition ‘being elec for the motor causing the latter to be under said tromagnetically locked to prevent turning'of the one condition'between said tuft forming intervals 60 pullover shaft, control means moving with and be under said other condition during‘ said the operating shaft and effective during a part of tuft forming condition. ' 13. ‘In an Axminster loom having‘ a pullover shaft to move tube frames oneat a time to trans fer position, transfer means operative during a tuft forming interval of loom operation to move a tube frame away from transfer position to tuft forming position and then return the tube frame to transfer position, unitary means for alter nately turning said shaft and lockingsaid shaft against turning and including an electric motor a rotation of the latter to cause said motor to be under said one condition between tuft forming periods, and effective during the remainder of the rotation of said operating shaft to cause said motor to be under the other of said conditions during a tuft forming operation to enable the electromagnetically locked motor to prevent movement of the pullover shaft when a tube frame is in transfer position. VICTOR F. SEPAVICH.