US2522594A - Protection motion - Google Patents

Description

Sept 19, 1950 E. H. ASHTON ETAL PROTECTION MOTION 2 Sheets-Sheet 1 Filed March 29, 1947 INVENTORS EVERETT H- ASHTON ROBERT G- MALLARD ELVTN A. MASTRIANI w ,4 TTOR/VEV Sept. 19, 1950 E. H. ASHTON ETAL I 2,522,594

1 PROTECTION MOTION Filed March 29, 1947 2 Sheets-Sheet 2 INVENT RS TT H-ASHT N T G! MALLARD VIN A. MASTRIANI BY ATTORNEY Patented Sept. 19, 1950 PROTECTION MOTION Everett H. Ashton, Jersey City, and Elvin A. Mastriani, Newark, N. J., and Robert G. Mal lard, New York, N. Y., assignors to The M. W. Kellogg Company, New York, N. Y., a corporation of Delaware Application March 29, 1947, Serial No. 738,038

19 Claims. (-01. 139-346) The present invention relates to a fly shuttle loom, and more particularly to a protector motion for: effecting loom stoppage automatically [upon the failure of the shuttle to complete properly its flight across the loom.

The usual type of protector motion comprises a protector rod, which runs the length of the lay between the shuttle boxes, journalled for rocking movement in bearings fastened to the underside of the lay. At each end of the lay, there is secured to the protector rod an upwardly extending protector rod finger spring-pressed against a binder of the corresponding shuttle box. Secured to eachend of the protector rod is a so-called dagger, forming a bell crank with the protector rod finger,.and-spring loaded towards protective position to engage directly a slide piece or frog during the forward beat-up movement of the lay. When the shuttle properly enters the box, the binder is pushed outwardly, thereby forcing the protector rod finger back. In this manner the dagger is lifted into the inoperative position, so that as the lay comes forward, the dagger passes over theirog; If the shuttle fails to enter the box properly, the binder will not complete its outward motion, consequently the dagger will not move out of the way of the frog during the beatup movement of the lay. Under these conditions,

the dagger engages the frog and slides it into position to stop the lay and simultaneously to disengage the clutch and apply the brake.

Inithe conventional looms, substantial forces are; set .up by protective action in the sudden stoppage of the lay. Furthermore, these forces are" transmitted in directions not in line with the swordscarrying the lay, so that heavy twisting .and bending moments are set up in the lay, the swords and other parts of the loom. Moreover, during protective action, the lay checking thrusts are rigidly transmitted directly from the frogs to the daggers to the bearings ofthe protector rods, thereby subjecting the protector rod bearings to excessive stresses. Also, if the shuttle enters the box after the dagger has engaged the frog, .the shuttle may be jammed in the box thereby injuring the shuttle.

Moreover, in conventional looms, the dagger is so constructed and arranged that its frog engageable point moves through an arcuate path;

to pass the frog so that the interval for proper:

boxin of the shuttle is very short. Hence, if there is [a slight delay in boxing, the protector mechanism may be set in motion to stop the lay, even, though such delay is insignificant and the institution of. protection not necessary. This I 2 unnecessary actuation curs most frequently at high speeds.

Among the objects of the present invention are to provide improvements in protector motion which reduce to a minimum stresses and thrusts on the lay, the swords, the-protector rod bearings and other parts of the loom arising from protector operation and loom bang-offs, which reduce to a minimum damage to the shuttle or to parts of said motion, and avoid jamming of the shuttle in the box resulting from delayed boxing of the shuttle, and which. serve to avoidunnecessary or premature hang-off actions.

Various other objects of the invention will be apparent from the-following particular description, and from an inspection of the accompanying drawings, in which:

Fig. 1 is a side view partly in section of a right side portion of a loom showing a protector motion embodying the present invention, parts of said motion being shown in normal position near the end of the forward beat-up movement of the lay, and while the shuttle is completely boxed;

Fig. 2 is a view of the protector motion shown in Fig. 1, but showing the parts thereof during the beginning of the forward beat-up movement of the lay before the shuttle has been boxed;

Fig. 3 is axview similar .to Fig. 2, but show ing the protector motion in action due to the failure of the shuttle to be boxed at the proper time;

Fig. 4 is a top plan view partly in section of a portion of the loom, and showing the protector ture of the loom may be of the conventional type, but in accordance with other features, it is desirably of the improved form shown in copending. application, Serial No. 691,237, filed August 17, 1946. In this improved type of loom frame structure, instead of the conventional loomsides, each with a single frame web, each loomside comprises a pair of parallel webs l0 and of the protector motion oc- I II rigidly interconnected by suitable girts and other bracing members.

The loom, which is of the fiy shuttle type, comprises a horizontally disposed lay I2 secured to the upper ends of a pair of upright swords I3,

mounted at their'lower ends upon=a rocker shaft (not shown), servin'gas a support about which the upper ends of the swords and the lay oscillate forwardly and rearwardly.

secured to the respective swords I3 by pivot fork connections I5, and operated from a crank shaft (not shown) in the usual manner.

The lay I2 comprises a horizontally-extending beam I6 on which is mounted at each end thereof 'a plate It forming the bottom of a conventional .shuttle box 25 for a fly shuttle 2|.

Theshuttle box includes a front box plate 22, a top box plate 23, a back box plate 24, and a binder pivoted at its outer end and biased towards the front plate 22 by a suitable light-"binder spring.

(not shown).

The shuttle 2| ofusual construction, and is arranged to enter the box 20 at the end of its picking-motion, and .to engage'thebinder 25;" The binder 25 ismoved rearwardly about its pivot con-- nection as the shuttle 2t enters the box 25.

Behindthelay I2 in the vicinity of each shuttle.-

box 251s a protector rod finger secured to a protector'rod. 3| as a crank arm, and having a tappet in:the. form of a screw 32 at its upper endv engaging the rear'side of the binder 25.

The protector rod 3! extends underneath the lay beam I6 along the .full length thereof, and'is supported for rocking movement in: bearings: 33. afiixed to said lay beam by means ofcap screws 34. The protector rod 3| is showncomprising straight intermediate body section 35 and end The oscillation of the swords I3 is effected by means of pitmans. I4.

against a heavy compression spring and plunger to positively stop, within limits, its forward sliding movement so that the lay is also positively stopped within limits. The stop limits are so selected that the lay will always stop sufiiciently short-of front deadicenter' toi'prevent; the shuttle from being carried into the fell of thecloth.

The block 5! serves not only as a guide for the bunter 55, but also as a thrust resisting member sections 36 connected thereto for unitary movement by means of sleeve couplings 31, and each shown as having a straight section 38 and a curved end section 4E! terminating in a rod clamp 4 I'. "The rod clamp 41 holds the lower end ofzthe.

protector rod finger 30 by means of clamping cap:

screws 39. I

Altorsion spring .42 encircles the intermediate section 35' of the protectorro'd 3I, and'has'one'end held b a fixed abutment member 43 secured to thelay beam. I6 by screws 44, and serving asza bearing for said protector rod. The other end of 'the spring 42' is held by a. sleeve clamp 45,

secured to the protector rod 3|, which can be ad-- 1 justed rotatively on said rod to adjust the tor.- sional' force of the spring 42.

their respective binders 25, to enable protector rod 3! to follow the oscillating movements of the binders 25; :To'translate the rocking movement of the protector rod 3! into protective action, there is secured to each endv section 36 of rod 3| a crank arm 48.

The crank arm 46 actuates a bunter or trip 53, which is guided for substantially vertical movement in a guide block 5I secured to the front side of the corresponding sword I3 by cap screws 52. The trip is adapted, during protective actuation, to move into engagement with a frog 53 supported for slide movement in a fixed guide- The frog 53 when so engaged, is

bracket 54. moved in' position to check the forward movement' of the lay, disengage the loom clutch, and apply the loom brake.

The frog 53, in disengaging the clutch and applying the brake, as will be more fully described, simultaneously acts through a lever system The spring" 42 serves to load the protector rod fingers 30 against slidably mounted a collar 51. The slide ciollar lilw: is urged downwardly against the end of. thercranle: arm 45 by means of a coil spring58encirclingtha against said 3;

stem 55, and bearing at its end'scollar and thestem head 56',

The end of the crankarmllfiis.

to said bunter and said collar. The guide block; 5l-is providedon its back protector. motion. i

At its forwardend, the .guide block 5! has:.a-s. dovetail groove 57 engaging a dovetail'tenon 68: on the hunter 50 to form a slide connection-there-i with. To permit replacement of' wearable parts, the dovetail slide. groove libmaybesformediby mounting, to the mainzbody of the guide blocki5I: by cap screws "H, a pain of g ib: plates Ill having;-

their inner edges bevelled to'definezthe-sides-of said groove. cluding the parts defining the groove Bl, maybe integral.

To limit the 'downward movement of the hunter 50, there is mounted at the upper" end of said A bunter a stop 12 shownin the form of a cap screw, Hi the projecting head of which is adapted to'engage.

the upper end of the bunter 'guide b1ock'5l. l

The forward side ofthe bunter'EII isprovided at its lower end with anotch I5 defining a-bevelled. projection 16 adaptedtoffit underracomplementalv rear projection TI on the frog 53 during protective action.

The fixed guide bracket 54 has a-dovetail'slide connection with the frog 53, and is supported on ledge pieces 18 fixed to the frame webs Ill and II in any preferred way as by welding-and-provided' with respective recesses on their uppersection's.-

The bracket 54 comprises a block 8|, a pair-of spaced parallel wings 821 extending forwardly from said block and horizontalmounting flanges: 83 extending'outwardly from the sides of s'aid' block and secured in respective recesses 80 of th ledge I8 by studs orcap-screws 84'. The top'of the bracket block- 8 I, in'c'onjunctionwith the-side flanges, 83, defines a. dovetail slide groove 85 adapted to receive the lower dovetail tenomsec forked andzits two tines I55 flankthe stem.55,.tines fill arecon vexly curved where they engage, the top .ofrztha.v bunter 5B and the bottom of .theslide collar5l, to?- permit swivel movement of said tines with. respect:-

side and at each end with a pairtofmou-nting flanges": 55 abutting the corresponding swords I3,xand pro-x vided with respective notchesfifi through-which; the'cap screws 52 extend. This construction permits the guide block 5! tobe adjusted1 iirproper position with respect to,v the other parts of the."

However, the guide block 5i, in-

dovetail. slider;

tion 86 of the frog 53. The upper section 81 of the frog 53 is of rectangular shape, and fits with a slide fit into a corresponding rectangular recess 88 in the bottom of the guide block 5|.

The rear end of the dovetail slide groove 85 is closed by a stop member 90 fixed to the bracket 54 by screw studs 9|, and serving to limit rearward movement of the frog 53, as shown in Fig. 2.

, Disposed in the path of movement of the frog 53 is a lever 95 extending at one end between the bracket Wings 82 and mounted on a pivot pin 96 supported in said bracket wings. The lever 95 is formed with a recess 91 on its rear side to receive partially the bunter 50, the stem 55, and the members 56, 51 and 58 associated therewith. The forward side of the lever 95 engages one end of a plunger 98, the other end being adapted to slide in a bearing sleeva| fixed to the vertical wall I0| of the breast beam I02 by bolts I03. The plunger 98 is adapted to project beyond the slide sleeve I00, and to engage the outer end of a short crank arm I04 secured to a shaft I05 suitably journalled in bearings fixed to the loom frame. The shaft I05 carries the usual shipper lever I06 by which the loom clutch and brake are operated.

Preferably a crank arm I04 is provided, for each. plunger 98. In this manner, the thrusts on the lay I2; the swords I3, the shaft I05 and associated partsresulting from protective action and bang off action, are equalized, balanced and symmetrically applied.

Each plunger 98 is urged to the left (Figs. 1 and 4) by means of a powerfulenclrcling spring I01 hearing at one end againsta head I08 on said plunger, and bearing at its other end against the fixed slide bearing sleeve |00.'-"T-he springs serve to maintain the levers 95 and the frogs 53 in the normal inoperative position shown in Fig. l, and to return these protective parts into said position when the'loom is restarted, and also serve as shock absorbers for the lay I2 in its bang-oil" action.

I. The plunger 98, lever 95, frog 53, bunter 50 and bunter guide block 5| are disposed directly in front of the corresponding sword I3, and 'cenand in turn to its respective pitman I4 with a minimum of bending or twisting action on the lay I2 or on said sword. The guide block 5| is" connected to its corresponding sword I3 at a level close to the pivot connection I5 between said sword and its pitman I4, so that the thrust due to protective action is transmitted from said guide block directly to said sword near said pivot connection, and is thereby effectively resisted by said pitman with minimum of bending or twisting action on said sword.

In the operation of theprotector motion described, while the shuttle 2| is in flight, thebinder 25 is biased forwardly towards the front plate 22 of the box 20, so that the protector rod crank arm 46 will be depressed downwardly, and the bunter 50 will be in its lowermost position shown in Fig. 2. While the lay I2 is moving forwardly, and as long as the shuttle has not been boxed, the elevation of the bunter 50 will be as shown in Fig. 2 in position to engage the frog 53'. As soon as the shuttle 2| is properly boxed in the shuttle box 20, the binder 25 is moved rearwardly by said shuttle, this causes the bunter 50-to riseabove the frog 53, so that the continued forward movement of the lay I2 is efiected as shown in Fig. 1, without disturbing the lever 95. If the shuttle 2| is not properly boxed before the bunter 50'engages the frog 53, then the bevelled forward trip projection 16 on said bunter will engage the bevelled rear projection 11 on the frog 53, and move said frog forwardly along the bracket 54. Under these conditions, the frog 53 being in engagement with the lever 95, will push said lever clockwise about its pivot support 96, thereby moving the plunger 98 in its slide bearing I00 against the action of the corresponding spring I01. The plunger 98 through the crank arm I04 rotates the shaft 05 in a direction to disengage theloom clutch and apply the loom brake. The springs I01 absorb the shock resulting from the bang-oil? of the lay I2.

Assuming that the bunter 50 reaches a position in engagement with the frog 53 during the forward movement of the lay I2, and thereafter the shuttle 2| enters the shuttle box 20, then under these delayed shuttle boxing conditions, although the protector rod crank arm 46 will rise, the bunter 50 will remain in engagement with the frog 53 as the lay continues its forward movement, and the protective motion necessary to stop theloom will be instituted as shown in Fig. 3. This upward movement of the protector rod crank arm 46 is effected against the action of the spring 58 on the stem 55, so that the re tarding boxing of the shuttle 2| does not jam said shuttle in the box 20, does not put excessive stresses on said shuttle, and does not exces sively stress the protector rod members 30, 3| and 46.

It should be noted that the bunter 50 moves substantially vertically, so that its frog engag-f ing section 16 does not have a movement to wards the frog 53 aside from that due to the forward movement of the lay. This substantially vertical movement of the bunter 50 will afford a time lag which will permit the shuttle 2| to, be boxed at a slightly delayed phase without putting into operation the protector motion; This is particularly advantageous in connection with high speed operations, since slight delays which are not important, and which may eventually be corrected automatically, would otherwise cause unnecessary and premature bang-offs of the loom.

As many changes can be made in the above apparatus, and. many apparently widely different embodiments of this invention can be made without departing from the scope of the claims, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrativeand not in a limiting sense.

What is claimed is: 1. In a loom, a lay, an upright sword for said lay, and a protector mechanism near the endof the lay automatically actuated when protection is indicated to stop the lay, and arranged to transmit the thrust resulting from protective action during any instant of said protective action in a straight line in a direction extend-' ing substantially through the longitudinal center:

line of the sword.

2. In a loom, a lay, an upright sword for said lay, and a protector mechanism near the end of the lay automatically actuated when protection is indicated to stop the lay, and com-',

alignment with the centerline of the sword in a asaaeee plane lengthwise of the loom, and adapted to receive the thrust resulting from a protective lay stopping operation and transmit it in said plane to said sword.

3. In a loom, a lay, an upright sword for said lay,- and a protector mechanism near each end of-the lay automatically actuated when protec' tionis indicated to stop the lay, and comprising a series of movable protector members in alignment with the sword in a vertical plane extending lengthwise of the loom, and passing through and along the sword, means for moving said protector members in a direction in said planefor protective lay stopping operation, and a guide for one of said protector members dis"-v posed in alignment with the sword in said plane and adapted to receive the thrust resulting from the operating movement of said members and transmit it to the sword in said plane.

4. In a loom, a lay, a pair of upright swords for said lay, and a protector mechanism near each end of the lay automatically actuated when protectionis indicated to stop the lay, and comprising a frog in alignment with the corresponding sword in a plane extending lengthwise of the loom and passing through and along said sword, a bracket guiding said frog for slide movement in a direction in said plane, a springpressed shock-absorbing plunger supported for movement in a direction in said plane and operated. upon slide movement of said frog in one direction to initiate lay shut-down operations, a bunter supported for oscillating movement with said lay and adapted to engage and move said frog along said bracket when protection is indicated, and a guide for said bunter secured to said sword on the front side thereof and adapted toreceive the thrust resulting from a protective lay stopping operation and transmit it directly to said sword.

5, In a loom, a lay, a pair of upright swords for said lay, and a protector mechanism for said lay near each end thereof, and comprising a frog, means for sliding said frog, means responsive to the slide movement of said frog in one direction for stopping the loom, said frog being located in front of the corresponding sword substantially centrally with respect to the sides thereof, and being movable for loom stopping operations in a direction substantially 1engthwise of the loom, whereby its thrust line of action during loom stopping operation extends substantially through the longitudinal center line of saidsword, and a thrust resisting member supported to receive the thrust from said frog due to its lay stopping operation and to transmit it to said sword in a straight line in a direction passing through said center line.

6. In a loom, a pair of substantially parallel frame Webs on each side of the loom, a lay, a pair of swords for said lay, each disposed substantially midway between the frame webs of each pair of frame webs, and a protector mechanism for the shuttle box near each end of the lay, each of said mechanisms comprising a fixed bracket disposed between the frame webs of each pair of frame webs and supported from said frame webs, a frog supported on said bracket substantially midway between the frame webs of said pair of frame webs and guided for slide movement thereon substantially lengthwise of said loom, means automatically operable when protection is indicated to move said frog in said bracket in one direction, means responsive to the movement of said frog in said direction for ill 8 stopping the lay, and means. for resisting the thrust from the frog resulting from its lay stop ping operation and for transmitting the thrustto said sword in a direction substantially par- 'allel' to the direction of slide movement of said frog. i

7.. In a loom, a pair of substantially parallel frame webs on each side-of the loom, a lay, a pair of swords for :said lay, each disposed substantially midway between the webs Of a pair of said frame Webs and a protector mechanism for the shuttle box near' each end of the lay, each of said mechanisms comprising a fixed bracket disposed between the frame webs of each pair of frame webs and supported from said frame webs, a frog supported on said bracket substantially midway between the webs of said pair of frame webs and in front of the corresponding sword, and guided for slide movement in said bracket substantially lengthwise of said loom, a lever in front of said frog adapted to be engaged by said frog during the forward slide movement of said frog, a spring-pressed shock-absorbing plunger supported for axial movement in alignment with said r sword'substantially lengthwise of the loom and operated by said lever upon forward slide movementiof said frog, to stop said lay, means for sliding said frog automatically forwardly when protection is indicated, and means for resisting the thrust from the frog during its forward movement and for transmitting it to said "sword in a direction passing substantially through the sliding said hunter in position to engage said' frog and move itin one direction, as said bunter moves forwardly with said lay, and operable when the shuttle is in the box for sliding said hunter out of said position, and means actuated uponmovement of said frog in said direction to stop said lay.

9. In a loom, a lay carrying a shuttle box near each end and a protector motion for each shuttle" box, comprising a frog mounted for slide movement forwardly and rearwardly of the loom, :a

slide bunter supported behind said frog for movement with the lay forwardly and rearwardly of: the loom, means operable when the shuttle is out'o'f the box for sliding said bunter in position to engage said frog and move it forwardly as said hunter moves forwardly with said lay andoperable when the shuttle is in the box for sliding said hunter-out of said position, and means actuated upon forward movement of said frogi for stopping'said lay.

10; In a loom, a lay carrying a shuttle box near: each end and a protector motion for each shuttle box, comprising a frog mounted for slide movement forwardly and rearwardly of the loom, a

hunter, supported behind said frog for movement with the layforwardly and rearwardly of the loom and for slide movement substantially vertically with respectthereto, means operable when theshuttle isout of the box for sliding said.

bunter downwardly inposition to engage said frog and move. it, forwardly as said bunter movesforwardly with said lay and operable when the shuttle is in the box for'sliding said b-unter 1113!, wardly out ofsaid position, and means actuated 9- il pn forward movement of said frog for stopping aid la -u 11. 'In'a loom, a lay carrying near each end, a pair of swords for said lay, and a protector motion for each shuttle box, comprising a frog,

a fixed member supporting said frog for slide movement forwardly and rearwardly of the loom, a buntersupported rearwardlyof said. frog, a member secured to a corresponding sword for guiding said bunter for movement substantially vertically with respect thereto, and for receiving the thrusts from the frog during forward movement of said frog and transmitting them to said sword, said bunter being movable with said lay forwardly and rearwardly of the loom, means operable when the shuttle is out of the box for sliding said bunter downwardly in position to engage said frog and move it forwardly as said bunter moves forwardly with said lay and operable when the shuttle is in the box for sliding said bunter upwardly out of said position, and means actuated upon forward movement of said frog for stopping said lay.

12. In a loom, a lay carrying near each end a shuttle box provided with a binder, and a protector motion for each shuttle box, comprising a frog, a bunter supported for movement with the lay forwardly and rearwardly 0f the loom and for slide movement relative thereto, and comprising a. connection between said binder and said bunter for sliding said bunter in position to engage said frog and. move it one direction when the shuttle is out of the box and as said bunter moves forwardly with said lay and for moving it out of said position when the shuttle is in the box, and means actuated upon movement of said frog in said direction for stopping said lay, said connection having a yieldable section to permit boxing of the shuttle without jamming after engagement of said bunter with said frog.

13. In a loom, a lay carrying near each end a shuttle box provided with a binder and a protector motion for each shuttle box, comprising a spring-pressed protector rod extending along said lay and journalled for rocking movement, a protector rod crank finger secured to said rod and engaging said binder to follow the action of said binder as the shuttle goes in and out of the box,

a protector rod crank arm secured to said rod, a

member mounted for movement, a bunter adapted to engage said member and move it in one direction, means responsive to the movement of said member in said direction for stopping the lay, and a yieldaible connection between said bunter and said crank arm, supporting said bunter from said crank arm, while permitting angular movement of said crank arm about the axis of said protector rod and relative to said bunter when said bunter is engaging said member.

14. In a loom, a lay carrying near each end a shuttle box provided with a binder, and a protector motion for each shuttle box, comprising a spring-pressed protector rod extending along said lay and journalled for rocking movement in bearings rigid with said lay, a protector rod crank finger secured to said rod and engaging said binder to follow the action of said binder, as the shuttle goes in and out of the box, a protector rod crank arm secured to said rod, a frog mounted for slide movement, a bunter adapted to engage said frog and slide it in one direction, means responsive to the movement of said frog in said direction for stopping the lay, a stem rigidly secured to said bunter, and a coil spring onsaid stem bearing at one end againstsaid crank arm and at the other end against ashoulder rigid with said stem to form a yieldable con-f necti onbetween said hunter and said crank arm, said bunter being movable with said lay for wardly and rearwardly of the loom, and being? movable relative to said lay and in position to engage saidfrog upon forward movement of the lay when said binder indicates failure of the shuttle'to box properly.

15. In a loom, a lay carrying near each end a shuttle box provided with a binder, a pair of swords for said lay, and a protector motion for each shuttle, comprising a spring-pressed protector rod extending along said lay and supported for rocking movement and for movement with said lay, a protector rod crank finger secured to said rod and engaging said binder to follow the action of said binder as the shuttle goes in and out of the box, a protector rod crank arm secured to said rod, a frog in front of a corresponding sword, a fixed bracket supporting said frog for slide movement forwardly and rearwardly of the loom, a bunter supported rearwardly of said frog, a member secured to a corresponding sword for guiding said bunter for movement substantially vertically with respect thereto, and for receiving the thrusts from the frog during forward movement of said frog and transmitting them to said sword, said bunter having a connection with said crank arm, whereby upon failure of the shuttle to box, said bunter is lowered in position to engage said frog upon forward movement of the lay and to move said frog forwardly, and upon the boxing of the shuttle is raised from said position, and means responsive to the forward movement of said frog for stopping said lay.

16. In a loom, the combination as described in claim 15, in which said connection between said crank arm and said bunter is a yieldable spring-pressed one to permit said crank arm to move relative tosaid bunter when said bunter is engaging said frog.

17. In a loom, the combination as described in claim 15, in which said connection between said crank arm and said bunter comprises a stem rigidly secured to said bunter, and a coil spring on said stem bearing at one end against said crank arm and at the other end against a shoulder rigid with said stem to form a yieldable spring-pressed connection by which said crank arm is permitted to move relative to said bunter when said bunter is engaging said frog.

18. In a loom, a lay, a pair of swords for said lay, and a pair of protector motions near the ends of said lay and comprising a pair of plungers in axial alignment with respective swords lengthwise of the loom, coil springs encircling said plungers respectively and urging them in one axial direction, means automatically operable when need for protection is indicated for moving said plungers in the opposite axial direction by the forward movement of the lay, whereby said forward lay movement is resisted by said springs, and means operated by the axial movement of said plungers in said opposite direction for shutting down the lay.

19. In a, loom, a pair of substantially parallel frame webs on one side of the loom, a lay, a sword for the lay disposed substantially midway between the frame webs, and a protector mechanism near the end of the lay automatically actuated when protection is indicated to stop the lay, said protector mechanism including an element mounted on the sword and astride the longitudinal centerline thereof and an element mounted between the webs adapted to engage said first element upon protection action whereby the thrust resulting from protection action is transmitted to the sword in a straight line in a direction extending substantially through the longitudinal centerline thereof.

EVERETT H. ASHTON.

ELVIN A. MASTRIANI.

ROBERT G. MALLARD.

The following references are of record i nthe 1 REFERENCES CITED file of this patent: I UNITED STATES PATENTS Number Name Date Cunnifi Mar. -19, 190'? Toyoda u .Apr. '14, 1914 Rogers Mar. 9, 1948

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