US2429006A - Brake for aximinster loom weft needles - Google Patents

Description

Oct. 1 1947. H. A. WHITIN 2,429,005

BRAKE FOR AXMINSTER oom WEFT NEEDLES Filed Nov. 13,- 19 45 3 Sheets-Sheet 1 FiG-l I Inventor e m i j fluorne; V

Oct. '14, 1947. H. A. WHITIN BRAKE FOKAXMINSTER Loom WE-FTNEE'DLES Filed Nov. 13, 1945 S-Sheets-Sheet Inventor Herbert 4 Min in Patented Oct. 14, 1947 UNITED STATES BRAKE FOR AXMINSTER L NEEDLES WEFT Herbert A. Whitin, Worcester, Mass, assignor to .Crompton &'Knowles L0 oin Works, Worcester,

v lljlass', a corporation oi? .t-w A. Applicationltlovember 13, 1 9 l Serial i,8, 2 0 9 This invention relates to brakes for the weft needle or Axminster moms and it is the general .object of the invention to provide means for bringing the brake to rest as soon as the loom has stopped to preventpth'eineedle .from drawing off "excess weft.

AXminster looms employ a long weft needle which moves along a railinto and out of the warp shed for the 'pur'pbs'e'of laying the weft or'filling :which "is' thre'addlthrough the free end of the 12' c ai s. (01: igaq zg needle; Asthe'needle is'insertedinto' the shed weft is drawn from the stationary packageof yarn to form a; loop through which the selvage shuttle moves iwhen theineedle is fully inserted .intocthe'slied. 'If theloomishould stop With the needle "partly inserte'dinto the shed it has been found that theineedlewhen driven by mechanisms heretofore'useddoes not come to rest instantaneously buttendstocont'inue its motion due to stretch and bending of certain parts of the driving mechanism; after which the needle recovers itself and has a reverse motion so that ultimately the needle comes to rest atapoint' corresponding W0 he po nt at wh chthe loom stops-- T e fo ;ward m ti n o j-thegneed e due' o t mo e tum loweve draws qf sh rtlene h of we t which is likely tobecome looped' around the free end o t eon e l with; r sultant b a e of the Wef 6 1:the loom is asailiste ted- It is an importantobjeot of my present invent ion to apply a brakingforce to the needle at a point close to the-needle as soon as-;the loomis s pe s ha t e t te chins an nd ng of cha ts i bezre ced to va-.m m m- I Certain a types of AXmin-ster looms employ a so-called multiple sheave needle motion made a t hev rin i set r h in P n P t 0 2i. 9. em n a l ne cabl h end f wh h ar fi j i s'pwt to eac he and e t j mediateportions of which are trained around sheaves so'meof which are stationary and others pt which move during loom operation. The cable is eq edi an ee le' arn ae a mo io of the movable sheaves imparts motion to the need e eer ege and the eedl n nee operating-mechanism of this typeit is found t at.

t ca e sfie istio slimm s r h QPB mi li he sa pr e dsun mb r q n of th eedt when the loom is stopped.- ;{Ifhe cable extends fr m .therieedle carriage along the needle rail to one of the stationary sheayesand it is an imbb an Object o m Pre en in t n to efipiy "braking iriahslt this last named sheave whener the 100517 is .st'

ipped; By this construction v loom needle motion or ing my inventiofnapplied thereto,

ther a er wi hin lei nt xe motion oi? an objectionable amount of wefti,

the loom motor, and

at the time of loom stoppage and the excess travel or the needle due to' its momentum is greatly re duced.""= 1 Itis another object of my present invention to provide anelectric solenoid control for the brake so constructed that-the solenoid isenergized dur i-ng loom'operation -t-o disable'the brake but as soon astheloom is stopped: the circuit of the solenoid is" broken andthe brake spring immediately sets the brake shoes againsta drum moving with the aforesaid stationary-sheave. The loom motor is also'provided-with a brake normallyidisabled by a solenoid" during loom 'operation, and it is'a further object of my invention to provide electric circuit means for the solenoids ofrboth the needle brake and the loommotor effective to deenergize the solenoids at thesa-nie instant. By this cons ruc on bath o .t e b ak s a e a plied at e same time with the *resu-ltthat the needle'oomes to rest when the loom is st opped .or' very shortly to draw Wit h se smothe ob e i w which ll appear as the description proceeds; my invention resides in the combination F and arrangement of parts hereinafter described and set forth.

In theaccompanyingdrawings,wherein a convenient embodiment'of my invention is set forth,

Fig 1 shows a-tront elevation of an Axminster operating mechanismhav- Fig; 2 is an enlarged end elevation looking in Fig. 3 is a front elevationilookingin the direction ofarrow 3,Fig. 2, l Tl Fig'. 4 is anenlar ged view looking in the direction of arrow 4,1Fig, 1, settir g}forth the'brake for Fig.5 is a diagrammatic view of an electric circ'uit fo'r controlling the solenoids at both the needlebrakeand the'lo'om motor... i

Referring particularly "to liig. '1, I vhave shown a m nameo from the rightend of which 4 extends an auiiili'ar'y frame QIII. supborting th'e -nzounted a bevel gear J3. 'Ijhelatteng'earnieshes with a ibe'vel pinion I tatable' in theauxiliary fram and; provided with right end of a drivinglshaft Hon which lis 1'4" secured to asha ft 1'5 r6- 2' crank lfij A eonneet'or-en isoperatively'intrposed between the crank T6 and a i lever." [8 which is supported on two 'IinkS the upper ofjwhich indicated "at is is j pivoted at :20 .With respect toilthe etishism" frame and the lower' r which indicated at 2 l'is'pivot'ed as am-2 'o'nthe frame. I Li A lever 51 and arm 56 link I9, and as crank I8 rotates during loom operation lever I8 is rocked toward and from the frame Ill.

The upper end of lever I8 has rotatably mounted thereon movable sheaves 25 around which are trained certain portions of a flexible cable designated generally at 26. One end ofthis cable is fixed with respect to the auxiliary frame as at 21, While the other end thereof is fixed as at 28. Right andleft sheaves 3i] and 3|, respectively, are rotatable with respect to the auxiliary frame. A single sheave 32 is mounted on the right hand part of auxiliary frame II and a second single sheave 33 is mounted at the left end of the auxj iliary frame. The cable 23 is trained around the movable and stationary sheaves and is connected as at 35 to a needle carriage 38 slidab-le backwardly and forwardly on a needle rail 3! supported in part by the auxiliary frame and in part by an upright 38. Frame II has an outer extension 49 on which is mounted the sheave 32, this extension lying under and being substantially parallel to the needle rail 31. 'A weft needle N is secured to the carriage 36. and has an eye 33 through which the weft W is threaded.

. A motor M is fixed to the bottom of the auxiliary frame and is provided with a pinion 45 meshing with a gear 46 secured to the shaft I2. As shown in Fig. 4 the motor is provided with a brake drum 48 for cooperation with brake shoes 43 and 55. A lever 5| pivoted at 52 to the auxiliary frame II has shoe 49 pivoted thereon as at 53, and the upper end of lever 5| is attached to a rod 55 which extends to the left and is connected to the-short arm 56 of a brake controlling lever 51. A second shoe lever 68 is pivoted as at 3| to the auxiliary frame and has the shoe 50 pivoted thereon as at 62. Levers 51 and 6!} are pivoted to each other at 63. 7

A solenoid 65 has a core 65 connected as at 31 to theleft end of lever 51. A compression spring 68 is interposed between an extension on lever 60 and a bar 59 having a pin 18 which is received by a slot II onthe under side of lever 51.

Under normal running conditions solenoid 65 is energized so that the core 65 is pulled down and lever 5i exerts a downward force on pin III to compress spring 68. Pin I acts as a pivot for is to the right as viewed in Fig. 4. The brake levers and 63 are separated and the brake is off. When the solenoid 65 is deenergized the spring expands, lifting the lever 51 and moving the arm 53 to the left, see Fig. 4, as the brake shoes are set to stop the loom motor.

During loom operation the sheave lever I8 is rocked back and forth andthe cable 26 causes movement of the needle carriage 36 along the rail 37, moving the needle N into the warp shed not shown to lay a double pick of weft, and then retracting the needle. It is not thought necessary to describe the details of the operation of the sheaves and cable since they are the same as set forth in the aforesaid Payne patent. That part of the cab-1e extending from the outer single sheave 32 to the needle carriage is designated at I0 and is the part which effects removal of the needle from the warp shed and is also'the part which follows the needle carriage when the needle i being inserted into the warp shed.

The matter thus far described is of usual construction and operatesin the ordinary manner and of itself forms no part of my present invention except. as noted hereinafter.

" In carrying my present invention into effect I provide brake mean-s for the sheave 32 operative 4 through the section 19 of the cable 23 to arrest movement of the needle more particularly when it is being inserted into the warp shed. Referring more particularly to Figs. 2 and 3, it will be seen that the needle rail 31 is provided with a stud I5 on which the sheave 32 rotates. The sheave is made of flat material such as a phenol condensation product and has a rear plate 15 and a front flange I1 between which the sheave is tightly clamped by means of screws or bolts I8.

Flange II has formed integral therein a hollow drum 8i] rotating with the sheave 32 between right and left brake shoes 8| and 82, see Fig. 3. Shoe 8| is pivoted as at 83 to a brake lever 82 pivoted as at 85 to a stationary support 83 on stand 31 fixed to extension 49. In similar manner shoe $32 is pivoted to a lever 88 pivoted at 89 to the bearing part 85.

Tension springs 92 have the right and left ends thereof connected respectively to hooked heads 9| and 92 pivoted at 83 to levers 84 and 85, respectively. Adjusting screws 93 in each head engage the associated lever for the purpose of varying the tension of springs 9|].

Mounted on support 83 is a solenoid 95 having a core 93 the upper part of which has rotatable thereon a ml 91. A lever 98 has the left end thereof extending under roll 91 while the right hand thereof is pivoted as at 99 to lever 88. A link I36 is pivoted as at IIlI to a part of lever 98 and has the other end thereof adjustably connected to the upper end of lever 84 as at I92.

In order to provide for vertical adjustment of the solenoid, the brake shoes and their levers the support 81 is provided with a foot IIil through which passes a vertical adjusting screw II I bearing against a shelf II2 formed on a bracket II3 held as at I I4 to the extension 49 of the auxiliary frame II. A bolt II5 connects the stand 8? with the bracket H3 and cooperates with vertical adjusting screw III to hold the support 87 in adjusted vertical position.

Solenoids 65 and 95 are so connected electrically that they are both energized and deenergized simultaneously. A circuit for effecting this result is set forth in Fig. 6 wherein the wires of a threephase power line which supplies electric power for the motor M are indicated at I20, I2I and I22. A three-pole switch I23 is provided to connect the power line wires with wires I24, I25 and I26 which run to the motor'M. The motor brake solenoid 65 is connected by wires I30 and I3I to switch controlled wires I24 and I25, while the sheave brake solenoid 95 is connected by wires I35 and I36 to wires I25 and I26. It will thus be seen that whenever switch I23 is closed both the solenoids 65 and 95 are energized and their associated brakes are moved to non-braking position. 'Whenever switch I 3 is open both of the solenoids become deenergized, whereupon their associated springs set the corresponding brake shoes to effect'stoppage of the motor and rotation of sheave 32.

Under normal condition of operation the brake shoes BI and 82 arein non-brakin position and sheave 32 is free to rotate first in one direction and then in the other as the needle is inser ted into and removed from the warp shed. If for any reason the loom should be stopped by opening of switch I23, solenoid 95 willbecome deenergized, whereupon springs will apply the brake shoes 8| and 82 against the hollow drum 80 which is secured to and turns with the sheave 32. This application of the brake at sheave 32 occurs simultaneously with application of the ,7 5. alie t the actor. The s'hort fse'ction 'lfl 'of the ble 26 between sheave 32 and the needle car'- e 36 ilhdrg s very'littl stretch during the w pingoperation, hence the needle is brought to rest at substantially the same time the loom is stopped. The cable is under s'ufiicient tension to have close frictional contact with the several sheaves around which it is trained and stopping of sheave 32 will act through the frictional engagemeat hetween the cable and this sheave to stop the needle carriage.

As previously indicated the reason for using the brake at the sheave 32 is to prevent excess increment of the needle after the loom has been stopped for the purpose of preventing the needle ,fiorn' drawing off an objectionable amount of weft This drawing of]? is particularly objection- "a e while the needle is being inserted into the d and it will be noted that the brake is ap- V to that sheave of system of sheaves, namely sheave; 32, from which the shortsection 70 of the cable leads to the needle carriage. Applicationof the brake to sheave 32 when the needle is being moved out of the warp shed will operate through the remaining length of the cable in which there may be some appreciable stretch, bjut there is no likelihood that excess Weft will be drawn on if the needle is stopped when being retracted from the as may occur in that part of the cable other than the section 10 will not be accompanied by harmful results or entanglement of excess weft with the eye end of the needle; I F

From the foregoing it will be seen that I have provided simple means for stopping the needle of an Axminster loom simultaneously with stoppage of the loom. I accomplish this result by use of a brake which is applied to one of the sheaves in the so-called multiple sheave needle operating mechanism. It will also be seen that the brake, is applied to that part of the system of sheaves set forth particularly in Fig. l from which the cable leads by a short section 10 the "stretch of which is negligible. It will also be 36cm that the brake is controlled through a solenoid which is normally energized during loom operation to disable the brake but which becomes deenergized whenever the loom motor circuit opens to permit application of brake shoes 81 and 82 by means of spring Hill. It will further be noted that both the motor and sheave 32 are provided with the same general character of brake mechanism, that is, each employs a spring normally disabled by a solenoid during loom operation, and it is for this reason that the two brakes become effective at substantially the same time.

Having thus described my invention it Will be seen that changes therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In an Axminster loom having a needle for laying weft, an operating cable for the needle, attaching means operatively connecting the cable to the needle, sheave means for said cable including a sheave from which the cable leads directly to said attaching means when the needle is being inserted into the warp shed, actuating means effective to move said cable in a direction to cause said attaching means and needle to move away from said sheave, and a brake for said sheave operative to stop rotation of the latter when said actuating means stops operating.

2. In an Axminster loom having a weft laying and modifications may be madewarp shed and such stretch V detects needle and operated by an electric motor,- a weft laying needle v actuating mechanism for the needle operated bypower derived from the m0.- tor, electromagnetic brake means for the actuating means and needle normally inoperative to stop the needle during loom operation, and means causing the electro-magnetic brake means to stop the actuating means and needle when said actuating mechanism stops due to stoppage of said motor.

3. In an Axminster loom having an electric driving motor therefor, electromagnetic brake means for the motor, a weft laying needle, driving mechanism operatively connecting the motor to the needle and causing movement of the needle into the warp shed by power derived from the motor, another electro-magnetic brake means in non-braking position during loom operation but capable when in braking position to cause stoppage of the needle, and control means causing simultaneous operation of both of said electro-magnetic brake means to stop the needle by the brake means corresponding thereto whenever the motor is stopped by the brake means corresponding therefor. V

4. In an Axminster loom having a weft laying needle movable along a needle rail, the loom having provision for being stopped at any point of travel of the needle along the rail, ah electromagnetic brake for the needle normally in nonbraking position, and means causing said electromagnetic brake to move to braking position to stop the needle whenever the loom is stopped.

5'. In an Axminster loom having a weft laying needle, 2. flexible operating cable connected to the needle, actuating mechanism to move the cable and cause the latter to give the needle a weft laying stroke, brake means normally in inoperative position during loom operation but moving to operative position when the actuating mechanism stops, and means moving with the cable and having motion thereof stopped by the brake means when the latter moves to operative position.

6'. In an Axminster loom having a weft laying needle, a carriage for the needle, afiexible operating cable connected to the carriage, actuating means moving during loom operation and causing the cable to give the needle a weft laying stroke, a sheave around which the cable is trained and from which the cable extends tangentially directly to the needle carriage when the needle is having a weft laying stroke, a brake for said sheave, and means to cause said brake to stop rotation of said sheave upon stoppage of said actuating means.

'7. In an Axminster loom having a weft laying needle, a carriage for the needle, an actuating cable operatively connected to the carriage, driving mechanism moving the cable during loom operation and causing the cable to give the needle 2. weft laying stroke, a guide sheave for the cable having tight frictional engagement with the cable during the weft laying stroke and from which the cable leads directly'to the carriage, brake mechanism for the sheave, and means causing said brake mechanism to stop the sheave upon stoppage of the driving mechanism and thereby stop the cable and needle.

8. In an Axminster loom having a driving motor therefor and a weft laying needle which is given an operating weft laying stroke by a force derived from the motor, two electro-magnetic brakes, and means causing simultaneous operation of said brakes and capable of causing said 7 simultaneous operation at any time during the weft laying stroke of the needle, one of said brakes acting to stop the motor and the other of said brakes acting to stop movement of the needle.

9. In an Axminster loom having a weft laying needle and weft threaded through the eye of the needle, actuating mechanism for the needle, a. flexible member operatively connecting the needle to the actuating mechanism, said needle due to the flexibility of said member tending to continue traveling during a weft laying stroke thereof subsequent to stoppage of the actuating mechanism, and means operatively connected to the flexible member along a length thereof between the needle and said actuating mechanism to apply a braking force to the flexible member and needle and reduce said tendency upon stoppage of said actuating mechanism.

10. In weft needle operating mechanism for an Axminster loom having a driving motor, a brake for the motor normally in off position during loom operation and moving to on position to stop the motor when 100m operation stops, an oscillating lever, driving connections between the motor and the lever to oscillate the latter when the motor is operating, a weft needle, a flexible ca-ble operatively connecting the lever and needle to cause movement of the latter due to oscillation of the lever, a guide sheave for the cable engaging part of the cable along a length thereof between the lever and needle, a brake for said sheave, and means causing operation of the brake for the sheave whenever the brake for the motor operates to stop the latter.

11. In weft needle operating mechanism for an Axminster 100m having a driving motor and a weft needle, an oscillating lever operatively interposed between the motor and the needle, operating connections between the motor and the lever causing oscillation of the latter during loom operation, flexible cable operating connections between the lever and the needle causing movement of the latter when the lever oscillates, said lever when moving in one direction placing part of the cable under tension to move the needle in one direction and cause the needle to draw the other part of the cable along therewith, said lever when moving in the opposite direction placing said other part of the cable under tension to move the needle in the opposite direction and causing the needle to draw said first along therewith, a sheave ene parts of the cable, a brake for said sheave normally in non-braking position during loom operation, and means causing the brake for the sheave to arrest motion of the latter when the motor stops during movement of said lever in either of said directions of movement thereof.

12. In an Axminster loom operating with a driving motor and having a weft needle, 2. train of driving connections between the motor and needle including an oscillating lever and driving connections between the motor and the lever to oscillate the latter when the motor runs, said train including also flexible cable means connecting the lever to the needle to cause movement of the latter when the lever oscillates, two brake means, one for the motor adjacent to one end of said train and the other for the cable means adjacent to the other end of said train, said brake means both being in off position during loom operation, and means causing both of said brakes to move to on position simultaneously whenever the loom is stopped at any point in the loom cycle, the brake for the motor arresting the latter and the connections between the motor and the lever, and the other brake arresting the cable connections between the lever and the needle.

part of the cable gaging one of said HERBERT A. WHITIN.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 4 1,562,659 Robertson Nov. 24, 1925 1,587,915 McCleary June 8, 1926 1,722,837 Clark July 30, 1929 1,823,298 Stone Sept. 15, 1931 2,258,191 Payne Oct. 7, 1941 1,080,091 Wintermayr Dec. 2, 1913 1,633,644 McGuiness June 28, 1927 1,782,945 Stone Nov. 25, 1930 2,257,228 Dietrich Sept. 30, 1941 FOREIGN PATENTS Number Country Date 445,254 Great Britain Apr. 6, 1936 614,479 France Sept. 20, 1926

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