US503466A

US503466A - Weft-stop mechanism for looms

Info

Publication number: US503466A
Authority: US
Publication date: 1893-08-15
Anticipated expiration: 1910-08-15

Description

(No Model) 3Sheets--Sheet' 1. A. D. BMERY.

WEIET STOP MECHANISM FOR LOOMS.

No. 503,466. Patented Augrl5, 1893.

(No Model.) 3 Sheets-Sheena. A. D. EMERY. WBFT STOP MECHANISM FOR LOOMS.

No. 503,466. Patented Aug. 15,1893.

nunnmunmmnn (No Model.) 3 Sheets-Sheet 3.

A. D. BMERY. WEPT STOP MECHANISM FOR LooMs. No, 503,466. Patented Aug. 15, 1893.

Mania? fla 2;. M )2 6S. 5? Jamm NrTED STATES PATENT OFFICE.

ABRAM D. EMERY, OF TAUNTON, MASSACHUSETTS.

WEFT-STOP MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 503,466, dated August 15, 1893.

Application filed December 4, 1891. Renewed December 1, 1892. Serial No. 4 (N0 modem To aZZ whom it may concern.-

Be it known that I, ABRAM D. EMERY, a citizen of the United States, residing at Taunton, Bristol county, Massachusetts, have invented certain Improvements in Weft-Stop Mechanism for Looms, of which the following is a specification.

This invention relates to improvements in mechanism for automatically stopping a loom in case a weft thread breaks or is missing.

The invention involves the combination of a main train of stopping mechanism consisting in the present instance of a spring-operated belt-shifter, a spring-operated brake and a tripping rod having a reciprocating movement, and a supplemental train of devices governed by the weft fork, which supplemental train whenset in action operates to lift the tripping rodof the main train and thereby release the belt-shifter to the action of its operating spring end resultantly to release the brake to the action of its spring. By the operation of this supplemental train of devices, the breaking of a weft thread permits the Weft fork to remain in position in which it acts as a link, and transmits from a lever which is continuously vibrated by means of a cam on the cam shaft, motion to vibrate a radius arm or wiper. which by engaging another tappet affixed to the tripping rod, lifts said rod and releases the beltshifter and brake to the action of their operating springs. The tripping rod thus lifted by motion from the cam shaft does not act as a chock to arrest the upward movement of the lay which may therefore complete its beat movement.

The improvements hereinshown are applied to a loom for weaving two fabrics at the same time by the employment of two simultaneously operated shuttles and of two weft forks.

While the feature of the present invention consists in the organization of stopping mechanism so related to two weft forks as to effect the automatic stopping of the loom if a weft thread breaks in either of the fabrics, it is obvious that the improvements are equally applicable to a loom for weaving a single fabric when there will be only one weft fork present.

The accompanying drawings represent so much of a loom as is necessary to illustrate my improvements and their mode of opera tion.

Figure l, is an end view of a portion of the loom, showing the starting and stopping mechanism in side elevation. Fig. 2, is a horizontal section on the line ww of Fig. 1,showing the starting and stopping mechanism in plan. Fig. 3, is also a horizontal sectionon the line z--z of Fig. 1, showing the belt-shifter and adj acent partsin plan. Figs. land 5, are respectively front and side elevations of the weft forks and the immediately adjoining parts of the loom in which weft forks are arranged, and Fig. 6, is a vertical section on the line y-y of Fig. 4.

The drawings represent portions of the frame A, of a vertical loom employing a lay, B, wide enough to afford parallel paths for two simultaneously driven shuttles, one of which, 0, is shown in Fig. 2. Motion to reciprocate the lay is derived from the crank shaft, D, to which are affixed a tight brakewheel, D, a tight driving pulley, D and a loose pulley, D The main train of starting and stopping mechanism embraces a beltshifter, a, which is a lever centrally pivoted upon the vertical pin, a. The perforated rear end a of the shifter is adapted to embrace the driving belt. Its front end is connected to the contracting spiral spring a and is provided with a handle a, by means of which the shifter is manually swayed upon its vertical axis against the resisting pull of its spring a", when it is desired to shift the driving belt from the loose pulley D to the driving pulley D and thereby start the loom. When the shifter is thus swayed, awiper cam a attached to its under side bears upon and rocks backward the upright arm I), of the T- shaped brake lever Z), against the downward pull of the brake spring b upon the horizontal arm b and thus rocks the brake shoe b clear of the brake wheel D If, while the belt is off the driving wheel, itis desired to move the loom by hand, the brake is taken off by pushing up the radius arm b affixed to hub of the eccentric 11 which is loosely pivoted upon the forward end of the horizontal arm, If. The periphery of the eccentric is thus brought into contactwith the stationary shoulder, b projecting from the frame of the ICO loom,and th front end of the horizontal arm, 6 of the brake lever is thereby elevated sufficiently to clear the brake shoe from the brake-wheel. As soon as the belt-shifter has 5 been moved far enough to throw the belt on the driv in g p u1ley the f9rvv ard e n c1 9f the manually operative stopping lever, -c,- rises and interposes between the belt shifter and the frame of the 1 om, t he ehock plate, 0',

10 which is affixed to the stopping lever c, and which when thus interposed between thebelt shifter andthe frame of the loomholds. 9111;, the forward end of the belt shifter against the pull of its spring, a and. thus permits the driving belt to remain in engagement with the driving. pulley. The stopping leverisloosely pivoted upon the horizontal pin 0 At its for-. ward-end it is provided 1with handle c by; m eh e -hieh it .f we eh i eh h mm allyep e iwh i hesi edt eme t hee hl t e' -hhd hh re e s the l hi eh o I th .eetieh t P. hh ehlt htly i-re ee th hrek tetheh t h ref th rhrhk @errihg th hhrho fi h hhehlbt tep n 5 i Ql-QQU :The nea e of theee epp heil ive ix ehd thhoh e ve101: i th e tica tripp n med ad *Th Jewe por io e rthe thinning e iehehpt dv ee ii in ".v hiea hearing.- formed in 5 the ,ar-rn A, which iS afo fixed to and projects laterally from thefranley ,of the loom. It :is thevsreight of the, trippin rod d, which bypressi n :downwval'd upon the; ree en th te l-hs e ee im th w f -eht eh ee th etephih lev n when; h he i shifter is swayed outward to start gtlIQlOOgIL W- e th hw deh o th et nhieel re i 'i s eh l l hr .e th p hst e t e1ere eah=d e .teph 7 a i i eth ahh e p rtio h h pi e-h -pre ees o againstand thereby ,throws out-of. engage menttwith the. ratehet-whee1 .E,-. (whichis the. t im wh o t tak 1h @mee ehhm). th Ehewl E h ie h .tek n: e hhn e -i 'eeth te h t ppin ddr-h imit d tehe e .h-pwhh vemen le t 1 lowe -eh i i a x d h e holler, e 119 t er of which is tacushion inthe fonm .of .;a washer d of leather, [or of other elastic onsemi-elae. i .=m ri z f rehehi he, t eh t-whe tth 5o; collision of r the upper surface ofithe ,washer 7 d3, a a ns i h e ri e re th er-m hrreete th h whh ere-1h e e --th h pih 4 ro d, and 7 hence arrests the fin rther upward movement of the; lay. Thjschock is not put 1. 1. by. h b k n o e we t: hi -1 13" whe h ttl s a l h bee-hu hi 4 t ehle he ismi t s p? the eem w e h ,e ht 'fails .tobox, as herein disclosed, is not claimed in. this but in another .pending application, e-S rie .Ne 3 1 file -F 6b '1 ."y= Thi mpl e t e desc ipt ei t ain efi tar i g t pp n mech nis The train .of hautomatiestoppin g meehan-z ism which is withheld from operation if the weftthread ispresentand is broughtainto; QPGrationif the met 1; thread. breaks-l may for; convenience be designated the weft train.

It embracesa Wiper can], i, mounted upon thecam shaftyl, and a bell-crank lever 7 the longer arm j of which is pushed forward and swings backward by its own gravityin the course of each revolution of the cam L. The shorter arm 7' is provided near its free end vv ith a transverse pin j the axis of which is parallel with the shaft k, upon which the bellcrank; lever-j, is: loosely-mounted. The shaft we drfn mi t 1hhnerh i hthhm mb A,

of the loom frame in vertical al ignrnent with thenht h emetie e r t weft-" rk g ate, .e tehdi-hee me h CQh- Ea '.=PQ Tl2iQ f-th layyB. ,As theme re two parallel .;r acew ays .eo t mplht diintme hl le mtt earr wh pi ote he h m r -extremity two tet e :-k hdap- :lh theeas o an o 113W l o weevh-sh e helefie r a enc riemn y he r em ee we t h eeurs enly v h m f s ehhzw heheet ed- It wi l h seen tha .-.th thr -hee dense por io oe t f $0 2 e-b h d teelly t w n v nd he t -th ee ree miahdthet he thre t med ilew n rt e 2 h th we vi k :29; nd i e-tehe ly hhekiw h -hh l hthth carria The uppet portions 2 01 I stemso and 19 o he-wef erhsie ev .theiep ih eefpiv htth meh ;t th wee e e in mo nrer h elhhe h en r e nee iv ln provide tat their upper extremities with the hooks v0 .an pihwh iiiw-lleh h :rreb gerk ereeu .J'QQ'B' o t hflueh e e ee evity, ok e h -e w rr -l rp i etihe Be t e- 1. 0f t rein J inse t hh hshi heh m j .Aetheleyrises d in en ehe ehet eh fi th 41 1 the w iw t th eadeexhehhih mem q h rat w ere brought ginto o.ollision=;vt7ithI the tined -.-lower; portionsof. theweft forks and-tip. the

..Weft forks outpofithe positions. inwhichthey are. represented in solid lines. Lon-Fig 6 into the positions 1 in- .whieh ytheyere qzepresented d t e 1i h n th sai' hehr -h W e e h Wi h $9l 5 heek l 1 '3 h1 W 1 in pposite.. eetieh hwr rem. h pat of t e he t 9 th h. e6 .QP. I .7' h is he qh i'p h itted; t r-make its vi ra n -mevemeh wi h u mpar --m v h --t the carriage m. If, howevergeither on both of th eft h ead hr h okeh t t eicoh lhs o of i the excursion-of either or 5hoth shuttles owar th end. e t -lay adi ih gth step- :ping mechanisrn then the tineqd lower ends of the weft forks enter the spaces -.between the ibarsiofthe-tweft forkgrate as the lay rises andfihe weft forks obeying the infiu ence of gravity remain in the positions in which they are represented in solid lines in Fig. 6 with their hooked upper ends extending across the path of motion of the transverse pin In such case the upward movement of the pin, j, is communicated to the carriage m. By means of aradius arm q the forward end of which is pivotally connected to the carriage m, and the rear end of which is fastened to the shaft 70, the upward movement of the carriage m, rocks the shaft 7t, and communicates a similar upward movement to the radius arm Z, which by collision with thetappet Z lifts the tripping rod (1, and thereby releases the belt shifter and brake to the operation of their respective springs and thus automatically stops the loom. It will thus be seen that in an ordinary loom containing the present improvement, the weft fork, or in a duplex loom like that shown in the drawings either weft fork, will serve as a link which maintains the continuity of the lever system by which motion is transmitted from the cam, to lift the tripping rod and thereby set in action the main train of stopping mechanism, if its weft thread breaks, and it will also be seen that if the loom is working normally the weft threads will, as the lay rises, tilt the weft forks immediately on them and thus break the connection of said lever system and thereby prevent the transmission from the cam, of the motion which when transmitted sets in action the main train of stopping mechanism.

I claim as my invention 1. In a duplex loom employing two simultaneously-operated shuttles, a main train of loomstoppingmechanism,embracingaspringoperated belt-shifter,a spring-operated brake, and an endwise-sliding tripping rod, in combination with a constantly rotating cam, a disconneetible lever system for transmitting from said cam the motion to trip the said tripping rod, and two independently tiltable weft forks, adapted to be tilted by the wefts, respectively, as the lay rises to deliver the beat, each of which forks when not tilted, serves as a link connecting to each other two consecutive members of the said lever system, as and for the purposes set forth.

2. The combination with a main train of springactuated stopping mechanism, of

means for holding and releasing said stopping mechanism, a longitudinally movable tripping rod connected with and controlling said means, guides on the loom frame, a movable cage supported in said guides, a continuously-operated shaft, abell-crank lever operated thereby, a weft fork pivot-ally connected with said cage and adapted to be tilted by the weft threads and when not so tilted to engage said vibrating bell-crank lever and means connected with and operated by the movable cage for actuating the tripping rod, substantially as described.

3. The combination with a train of springactuated stopping mechanism, means for holding and releasing said stopping mechanism, a longitudinally movable tripping rod connected with said means, a guide-way on the loom frame, a movable cage supported thereby, two connected radius arms, one being connected to said cage and the other adapted to engage and move the tripping rod, a bellcrank lever, a continuously rotating cam for operating said lever, and a weft fork pivotally connected to said movable cage to normally engage an arm of the bell-crank lever and to be tripped and held out of engaging position by the weft thread, substantially as described.

4:. The combination with a main train of stopping mechanism comprising a spring-operated belt shifter, a spring operated brake, a cam operated by the belt shifter to hold and release the brake, a locking lever to hold the belt shifter against the action of its spring, and a tripping rod provided with a tappet and connected with the locking lover, of a rotating cam, a bell-crank lever operated thereby, a movable cage carrying a weft fork loosely pivoted thereto and adapted to be moved by said bell-crank lever, and two connected radius arms, one of which is connected to said cage and the other of which is adapted to engage said tappet on the tripping rod, substantially as described.

5. In a weft stop motion for a vertical loom adapted to weave two fabrics side by side, the combination of slotted brackets provided with guides and secured to the loom frame, a cage adapted to slide in said guides and provided with two loosely pivoted weft forks, avibrating bell-crank lever, one arm of which projects between said brackets and carries a pin, two radius arms, one of which is connected with and is moved by the said cage, and means operated by the said arms to stop the loom, substantially as described.

ABRAM D. EMERY.

Witnesses:

HENRY J. FULLER, E. M. EMERY,