US3064690A

US3064690A - Shuttle positioning means

Info

Publication number: US3064690A
Application number: US58291A
Authority: US
Inventors: Zollinger Hans
Original assignee: Maschinenfabrik Rueti AG
Current assignee: Ruti Machinery Works Ltd; Maschinenfabrik Rueti AG
Priority date: 1959-09-25
Filing date: 1960-09-26
Publication date: 1962-11-20
Anticipated expiration: 1979-11-20

Description

Nov. 20, 1962 H. ZOLLINGER SHUTTLE POSITIONING MEANS 2 Sheets-Sheet 1 Filed Sept. 26, 1960 MVEWTUAZ HANS ZULL/IVGEA Nov. 20, 1962 H. ZOLLINGER SHUTTLE POSITIONING MEANS 2 Sheets-Sheet 2 Filed Sept. 26, 1960 3,064,690 SHUTTLE POSlTlONENG MEAIJS Hans Zollinger, Ruti, Zurich, Switzerland, assignor t Ruti Machinery Works Ltd, formerly Caspar Heidegger, Ruti, Zurich, fiwitzerland Filed Sept. 26, 195i Ser. No. 58,291 Claims priority, application Switzerland Sept. 25, 1959 7 Qlairns. (Cl. 139-155) This invention relates to a device arranged on a loom for dissipating the residual energy of the shuttle in the shuttle box and for moving the picker out of the range of the shuttle tip prior to the shuttle box change.

Devices for dissipating the residual energy of the shuttle in the shuttle box are already known, but they do not provide a picker resetting lever for moving the picker out of the range of the shuttle tip prior to the shuttle box change.

Devices for moving the picker out of range of the shuttle tip prior to a shuttle box change are also known. These devices are operated with controlled resetting means for reliably returning the picker. In these devices numerous controlled levers, lifting cams or other mechanical elements are used, which, for the greater part, are arranged on the sley and thus vibrate with it. The total mass of these vibrating mechanical elements is not inconsiderable and causes adverse additional stressing of the sley, a substantial increase of the power consumption of the loom and, premature wear and tear of vital parts of the loom as well as of the particular elements for reutrning the picker due to the collaborating vibrating parts. Undoubtedly the efficiency of the loom and the reliability, especially in the case of high-speed looms, are thus adversely affected.

The device according to the invention comprises a friction brake for the outwardly moving picker and a picker resetting lever pivotally supported on the sley, and is principally characterized in that the pivotally supported picker resetting lever is biased, preferably by an adjustable spring, to inwardly move to return the picker, and is connected through a friction coupling to a swing lever carried on the sley, having associated therewith a driving device arranged partly on the loom frame and partly on the sley, which, as the latter moves to its forward dead center, imparts to the swing lever a movement for moving the picker outwardly.

Further features of the invention will appear from the following description and claims, taken in conjunction with the accompanying drawing, wherein two embodiments of the invention are illustrated purely by way of example.

In said drawing:

FIG. 1 shows in top view the relative position of a shuttle, a picker and a picker resetting lever immediately after the shuttle has run into the shuttle box, when using a friction strap as a braking means;

FIG. 2 shows also in top view the relative position of the same parts on reaching the forward dead center of the sley, and the separation of picker and shuttle;

FIG. 3 is a top view of the arrangement and design of the parts, when using a disk-type braking means;

FIG. 4 shows the same inside view, as seen from the end of the sley.

The device is usable in looms with a pick-and-pick picking mechanism, the device being mounted to co operate with the picking mechanism.

On the upper surface of the sley 1 indicated in broken lines, there is the resetting lever 2 designed as a singlearrned lever rockably mounted on a pin 3 fixed on the sley. A resetting lever spring 4 tends to swing the lever 2 clockwise until it comes against a stop 5 adjustable and fixable on the sley 1.

assess E Patented Nov. 20, 1962 Rotatably mounted near the rear side of the sley 1, on a pin 7a fixed thereon, is a roller 7 fitted with a nose 8, and near the forward side of the sley, a single-armed swing lever 11 is pivotally secured on a pin 13 fixed on the sley. The swing lever 11 is provided with a cylindrical hub 12 designed as a roller. Both the roller 7 and swing lever 11 are each biased by respective springs. The two springs tend to turn the roller and swing lever 11 clockwise. The three springs, i.e. the one acting on roller 7, the one on resetting lever 2 and the one on swing lever 11, may be designed as cylindrical coil springs, one end of each of which is engaged on the sley. Because of the resulting structural simplification, it is however preferable to have each of said springs designed as a torsion spring, one end of which is secured respectively to the hub of roller 7 (spring 11]), to the sub of the resetting lever 2 (spring 4) and to the hub of the swing lever 11 (spring 14), while the other ends engage the sley. This makes it possible to locate the springs in the interior of the hubs and thus protect them from unavoidable lint from the loom. The two

rollers

7 and 12 are connected to each other by a strap 6 whose ends are fxed to the surfaces thereof. The strap 6 frictionally engages the

curved back

2a, 2b of the hub surface of the resetting lever 2 and in movement frictionally rocks the resetting lever 2 counterclockwise.

The spring 14) acting on roller 7 tends, by rotation of roller 7, to turn it clockwise in the sense of winding the strap onto the surface thereof. Hence this roller 7 is further designated as a take-up roller. This take-up rotation of roller 7 is limited by the nose 3 provided on the roller periphery, stroking the stop which is fixed to the sley and is adjustable for setting the amount of take-up.

By the pivotal movement of the swing lever 11 whose hub 12 has attached thereto the other end of the friction strap 6, a pull is exerted on the strap to tightening it firmly against the back 2b of the resetting lever 2. Of the two

springs

18 and 14, spring 11 is the stronger. The spring 14 only serves to ensure firm contact of the strap against the back of the resetting lever 2.

The free end of the swing lever 11 is pivotally connected to a cylindrical bushing 16 which, from the sley 1, extends forward toward the breast beam. Said bushing has a connecting rod 15 which is slidably guided therein and pivotally supported at 16a on the machine frame 18. Consequently, with the reciprocating movement of the sley 1, the connecting rod 15 slides in the bushing 16. Adjustably mounted on the connecting rod 15 is a stop 17 which, by abutting against the free end of the guide bushing 16, limits the displacement of said rod in the guide bushing. In this case, the combination connecting rod 15 and guide bushing 16 acts as a rigid element, whereby, with the sley 1 swinging forward toward the breast beam, the swing lever 11 is oscillated clockwise. Thus, the friction strap 6 is wound onto the hub 12 against the bias of spring 10 on roller 7. The movement of the strap frictionally engaging the rear face 2b of the resetting lever 2, rocks the latter counterclockwise, i.e. against the bias of the spring 4 acting on the hub of the lever 2. The end of the resetting lever 2 bearing on the picker 19, is released therefrom so that the picker 19, under the influence of the picking stock 21 passing through it, will be moved back to its rearward position and thereby moves clear of the shuttle 20 which is retained in the shuttle box by the braking action of the conventional swell.

The action of the described device is as follows:

The flight energy still remaining in the shuttle on its arrival at the change side of the loom is such that the shuttle when running into the shuttle change box at the picking side is braked, but not entirely brought to rest so that it comes against the picker 19 which is in con- .11 and machine frame 18.

tact with the resetting lever 2. Picker 19 and lever 2 together are moved against the bias of the torsion spring 4 of the resetting lever, and the friction between the resetting lever, 2 and the brake strap 6 which is initially at rest until the residual flight energy of the shuttle is dissipated.

During the operations hitherto described, the sley 1 has moved fromthe rear dead center to the forward dead center. Incidentally the. connecting rod slides unhindered in the bushing 16 pivoted to the swing lever 11 so that only the spring 14 acts on the lever 11 and causes the friction strap .6 to fr'ictionally engage the back of the resettingleve'r 2.

But before the sley has reached its forward dead center, the adjustable stop.1' 7 at the connecting rod engages the end of the guide bushing ,16. The displacement of 'the connecting rod 15 is thus terminated so that now, as

thesley 1 moves to the forward dead center, the

parts

15 and 16 constitute a rigid link between the swing lever The lever 11 is therefore swing clockwise to wind the forward end of the friction strap '6 onto the hub of lever 11, thereby causing the strap '6 to move and pivot counterclockwise both the take-up roller 7 against the action of spring 11 and the resetting lever 2 against the action of spring 4. In the pivoting of the resetting lever 2 the picker 19 is pushed by thepicker arm biased by a conventional return spring Incidentally the drawback lever moves clear of the picker 19 topermit the latter to swing out by the action of the spring-loaded picking lever. It therefore frees the shuttle tip so that shuttle box change can take place undisturbed. On the return of the sley and the incident pick, also the roller on brake lever 2d slides 'olf the cam guide so as to enable the brake lever, by the action of the

springs

22 and 24, to swing out clockwise together with the drawback lever 2c, until the latter hits the stop 5. In this position it is ready again to catch the picker and hence also the shuttle in its next return flight, in order, as assisted by the spring 22 engaging it, to brake the residual said frame between forward and rear dead center posito steadily engage the outwardly swinging resetting lever.

This outward movement of thepicker 19 trees it from the shuttle 2%) retained in the shuttle box by the braking action of the swell.

By the setting of the stop 5 for the resetting lever 2 and the stop '9 for limiting the turning of the take-up roller 7, the space between the picker in its end position and the shuttle in the shuttle change box may be so large about 1.0 mm.that even when the shuttle tip works into the body of the picker-presuming normal wear and tear of both parts-a free space, necessary'for a faultless shuttle box change, can be provided between the picker and the shuttle. ,7 7

As the sley next moves rearwuds from its forward ,dead'center, there follow consecutively the pick and the return of the resetting parts-into the position ready for a fresh arrival of the shuttle in its alternate flight'from side to side of the loom. 7

.I'n theembodiment of the invention, illustrated in FIGS. '3 and 4 an adjustably loadable disk-type brake is adopted as. a braking means for adrawback lever. a

' For this purpose, the :drawback lever, 20 and the brake lever 2dlare copivoted about a fixed pivot-3 at the sley so that the, brake. lever, bifurcated at its bearing end, embraces with itssides the drawbacklever.

While the lower hub part2d of the brake lever 2d (as shown in FIG. 4). is rockable direct on pivot 3, the upper hub part 2d has slidably inserted therein a bushingZg which 7 e is rotatable on pivot 3 and is positioned thereon with a lower hub :part2d' of the brake lever, biased toward each'other by the action of the brake spring 2f,'on the onehand, as well as the two ends of the hub of the drawhack lever 2c, on the other hand, are provided with brake linings, thus creatinga disk-type friction coupling which,'hand ac'ts'a's a'brake,capable of slipping in thecase of jerky stressing and. also capable of restraining the turning of one of the two levers.

The free end of the brake lever 2d is loaded by arrelativelywea'k spring 24Qand carries a travelling roller 2h with which, on approach of the sley to its forward dead center, it runs onto a cam guide 25 fixed to the machine tions, said device for dissipating the residual flight energy of a shuttle in the shuttle box and for moving with an outwardly biased picker clear of said shuttle prior to a shuttle box change, and comprising: a'resetting lever,

I having oppositely disposed end sections, pivotally mounted .the swing lever; and a drivemeampivotally connecting the other end section of said swing lever to said stationary frame, and adapted on the movement ofjsaid sley to said forward dead center position to pivot said swing lever and, through said frictional coupling, said resetting lever to release said outwardly biased picker'to move clear of said shuttle. I p g 2. Device according to claim 1 wherein the respective one end section of said swing and resetting levers are formed as roller portions respectively concentric with the respective pivots of said levers, and said frictional coupling comprises a strap frictionally engaging said roller portions of said levers, and including strap securing means for one endof said strap mounted on said sley and arranged for said roller portion of the resetting lever to be inter .mediate. said securing means. and said roller portion of the swing lever, the other end of said strap being secured to said'swing lever. v

3. 'Device according to claim '2 wherein said 'strapsecuring'means comprises a roller pivotally mounted for rotation on said sley, said strap engagingand sec'ure'd to stop means associated with said roller for adjustably limiting saidrotation, and biasing means for biasing said roller to rotate to said stop in a direction to further en- 7 gage said strap.

4. Device according to claiml wherein said drive means comprise a bushing pivotally connected by anend to said other endfof'said swing lever, a'connectingrod longitudinally displaceable in'said bushing and having a free end 'pivotally connected to said stationary'frame, and an adjustable stop secured to saidconnectingrod intermediate said bushing and said frame for spacing 7 from said bushing the driving distance necessary to pivot said resetting lever for the outwardly biased picker to. 7 move clear 'of said shuttle.

5. Device according to claim' 1 wherein said drive means comprises a control cam attached to said stationary frame, and a roller mounted for rotation on said other end section of said swing lever and adaptedto engage said control cam as said sley moves to forward dead center position.

6. Device according to claim 5 wherein said resetting lever and said swing lever are coaxially arranged, and the friction coupling therebetween comprises brake disks 5 interposed between said levers.

7. Device according to claim 6 wherein said friction coupling includes a bushing mounted axially movable in said other end section of one said lever and in contact with an adjacent brake disc, and an adjustable spring mounted 10 to bias said bushing against said adjacent brake disc.

References Cited in the file of this patent UNITED STATES PATENTS Cederlund Dec. 9, 1941 FOREIGN PATENTS France Aug. 4, 1930 Germany Apr. 24, 1904 Great Britain Dec. 21, 1933