US1868720A - Shuttle check and protector mechanism - Google Patents

Description

y 6, 1932. w w. ROBERTSQN sauww: CHECK AND PROTECTOR uscnmrsu Filed March 4, i931 2 Sheets-Sheet 1 Jvvsxv 727/? W. [M F0555 750M v F Afimwvcrj W. W. ROBERTSON SHUTTLE CHE CK AND PROTECTOR MECHANISM July 26, 1932.

2 Sheets-Sheet 2 Filed March 4, 1931 J g m m w Cw: III 10 1., 1 s Q s k w 0 H i a W x F k n v m1 I 7 m i n a V. TH rM H MW am y m a in ,0 W W a W A b e ,P i I I 5 3 L 1 W 0 (31Kv ,1. lib. BMW m R w H 7 H/ a w 5 a W x Q w n xi A 3 -w a J H m o a a w a H Patented July 26, 1932 NITE'D STATES PATENT OFFICE WILLIAM W. ROBERTSON, F WORCESTER, MASSACHUSETTS, (ASSIGNOR TO CROMPT'ON' & KNOWLES LOOM WORKS, OF WORCESTER, .MASSAGHUSETTS, 'A CORPORATION OF MASSACHUSETTS SHUTTLE CHECK AND IPROTIIGTOR MECHANISM Application filed March 4, 1931.' Serial No. 520,034.

This invention relates to improvements in shuttle checking devices for looms and it is of shuttle check or binder which acts through-- out the greater part of the motion of the shuttle in the shuttle box to retard movement ofthe shuttle and to control the protector mechanism. As a result of this arrangement a shuttle may enter the box suflicientlyto move the protector finger out of protecting position but the shuttle will not be completely boxed. This results in a defective pick on the following beat of the loom with possible breakage of the picker stick.. It is an important object of my present invention to divide the shuttle checking apparatusinto two separate parts one of which is located adjacent the mouth of the shuttle box and is in contact with the shuttle throughout prac- T tically its entire movement in the box to thereby exert a stopping force on the shuttle.

This force is notenough, however, to absorb all the energy of the shuttle, and the second part of the apparatus which is located at the outer end of the box absorbs the remainder of the energy of motion of the shuttle as the latter becomes completely boxed and also operates the fingers and daggers ofthe protector mechanism.

In weft replenishing looms it is customary to employ the shuttle with a large slot through which the exhausted bobbin may be expelled, and in double shuttle looms these X slots are ordinarily horizontal and parallel to each other, the shuttles being arranged one over the other. In the form of binder heretofore proposed for this type of loom there has been a pair of narrow surfaces to engage that part of the shuttle which lies above and below the bobbin slot. These surbe so arranged as to engage the ends of the shuttle when the latter is boxed, but will be out of contact with the central portions of the shuttles. It has been observed in certaininstances that the narrow surfaces cut grooves in the shuttle, but these are eliminated when the narrow surfaces are omitted; It has been found that the shuttle checking apparatus of the type set forth herein is distinctly advantageous on bobbin changing looms because it can be spaced a considerable distance from the path of the outgoing bobbins.

It is a further object of my invention to provide asecondary checking device, or that part which lies at the outer end of the shuttle box, with'means for controlling the protector fingers, these 'meansbeing shown herein as arms which are always 'outof contactwith the shuttle and out-of the path of the outgoing bobbin.

It is a furtherobject of the invention to employ the springs of the protector mechanism to stress the initial'brake without permittingthe latter to operate the dagger.

With these and other objects in view which will appear as the description'proceeds, my invention residesinthe combination and arrangement of parts hereinafterdescribed and set forth in the claims.

Inthe accompanying drawings, wherein a convenient embodiment of my invention. is set forth,

'Fig. .1 is a top plan view of portions of the right hand end of the double shuttle loom having myinvention applied thereto, i

,Fig. 2 is a viewcsimilar to a portion'of Fig. 1,"but withcertain parts removed for' Fig; 5 is a rear elevation looking in the .1

directionof arrow 5, Fig. 4, and V Fig. 6 is a vertical sectionon line 66 of Fig. 1. p

Referring to the drawings, I have shown a loom frame 10 and a lay 11 having a slot 12 for the'oicker stick 13. Upper and lower shuttles S and S respectively, are carried too by the lay and are each provided with a picker one of which is shown at P in Figs. 1 and 2. The lay may be provided with a box front 14 supported by a plate 15 which separates the upper and lower boxes. The boxes are fixed with respect to the lay and do not shift, the shuttles being employed to weave a socalled double fabric having upper and lower webs between which may extend pile forming yarns. The plate 15 defines an upper box for shuttle S with a box top 16 secured to the lay, and also a second shuttle box with the lower shuttle S with the race plate 17. The shuttles will ordinarily be of different cross section because of the differing shapes of the sheds through which they travel.

Designated generally at M is a weft bobbin magazine having guides 20 and 21 for a series of bobbins B. A transferrer slide 22 moves between guides 23 under influence of the transferrer lever 24 and against the action of return springs 25. A regularly oscillating hook 26 moves rearwardly from the position shown in Fig. 1 on those beats of the loom when both shuttles are at the right hand side of the loom, and a controller 27 is actuated through appropriate detector mechanism not sh own to connect the hook with the lever.

The. matter thus far described forms no part of my present invention and may be. made in a manner similar to automatic weft replenishing double shuttle looms now in use.

In carrying my invention into effect I provide two separate brakes or checks for each shuttle on the magazine side of the loom. Accordingly, I secure to the lay a pivot bolt 30 which, as shown in Figs. 1, 3 and 6, extends through the box top 16, late 15, and the shuttle race 17 Pivoted to this bolt are upper and lower binders 31 and 32, respectively, which are positioned for engagement with the shuttles S and S, respectively. The particular form of the binders is substantially as set forth in Fig. 2. Each binder comprises a lever 33 having a straight friction surface 34 curved at its left hand end as shown in Fig. 2 at 35. The upper binder is formed of a top flange 36 to which is secured a protector arm 38 by means of bolts 37. The lower binder is similarly formed with a flange 39 which is attached to a lower protector arm 41 by means of bolts 40.

As shown in Figs. 2 and 3 a spring 42 is provided for each binder and these springs tend to hold the binders in forward position so that the rounded surfaces 35 will engage the advancing nose of the shuttles as the latter are boxed.

The protector mechanism as shown in Fig. 4 comprises a hunter 40 having two notches 41 and 42, respectively, which are adapted for engagement with daggers 43 and 44, respectively. Dagger 43 moves with the top rolling rod 45 to which is secured a finger 4G to bear against the lower protector arm 41. In similar manner, dagger 44 is secured to a lower protector rod 47 to which is attached a finger 48 having engagement with the upper protector arm 38. Springs 49 are operatively connected to the protector rods and tend normally to move the daggers downwardly into knocking-off position with respect to the hunters.

The brake device which is located at the inner end of each shuttle box comprises upper and lower checks 50 and 51 which are pivoted to a vertical bolt 52 and are similar to bolt 30 as to function and support. Each brake is provided with a clip 53 through which extends a bolt 54 the inner end of which is held by a small bracket 55. A com pression spring 56 is located between the bracket 55 and the clip 53 and by means of adjusting nuts 57 on the bolt 54 the pressure of the spring may be varied. The head of each of the bolts 54 limits angular movement of its corresponding check or brake in a clockwise direction as viewed in Fig. 2.

The upper brake 50 normally bears against the protector arm 38 so that the spring 49 which transmits pressure through the finger 48 will act in addition to the compression spring 56 to assist n'iovement of the brake in a left hand direction as viewed in Fig. 1. In similar manner the other spring 49 is connected through finger 4G to the lower brake by having the lower protector arm 41 in contact with said lower brake. In this way each brake located at the inner end of the box has its rearward movement resisted by one of the springs of the protector mechanism.

In operation, the springs 49 and 56 tend to hold the brakes 50 and 51 in the forward position suggested in Fig. 2. Each bral; is preferably lined with a friction surface 60, such as leather, and this surface of each brake extends vertically throughout the greater part of the height of the corresponding box. As the upper shuttle enters the top box its rounded rear surface 65, as shown in Fig. 1, will engage the upper initial or inner brake and move the same rearwardly against the combined action of springs 56 and the spring 49 corresponding to the upper protector arm 38. The shuttle has the effect of moving the brake so that the surface 66 of the latter will be in substantial engagement with the rear vertical surfaces of the shuttle, but the protector fingers will not be moved rearwardly sufliciently to cause the daggers to clear their respective hunters.

As the shuttle continues to move to the right as viewed in Figs. 1 and 2 it will be subjected constantly to the strain of the initial brake the effect of which will be retard the movement of the shuttle. As the latter approaches the end of its travel its rear :nseswao rounded surface 65 will engage the surface 35 to rock the secondary check or binder lever 31 around its pivot against the action of spring 42. The binder will thereupon move rearwardly and will arrest the movement of the shuttle, at the same time moving the protector arm rearwardly so as to raise the corresponding dagger and thereby permit continued running of the loom.

In a similar manner, the lower shuttle will act on the lower brake and then on the lower hinder, the effect being that each shuttle is first subjected to a constant braking action during its travel in the box and then to an additional resistance when engaging the binder to be brought to rest and also to operate the protection. As soon as the shuttle strikes its binder the pressure of the corresponding spring 49 will shift from the brake to the binder and because of the change in leverage the effect of the spring 49 will be greatly enhanced, so that it will force surface 35 against the shuttle with considerably more pressure than it had previously exerted on surface 66. In this way the same spring is brought to bear upon the shuttle but acts through two different instrumentalities the first of which is gradual in its action and the second of which is much stronger and more abrupt.

When the weft is exhausted the transferrer mechanism will act to move a fresh bobbin into the exhausted shuttle, expelling the exhausted bobbin rearwardly in a horizontal direction. This latter bobbin passes between the corresponding brake and binder and in the case of the upper box, will pass below the protector arm 38. In similar mannor. as a transfer takes place in the lower shuttle the outgoing bobbin will have a large, free and unobstructed space through which to pass, moving over the lower protector arm 41'. It is to be understood that the arms 38 and 41 at no time have contact with the shuttle. the braking action being produced solely by the initial brakes or checks and the secondary brakes or binders. In this way uniform wear along the rear surface of the shuttle may be attained without the formation of grooves. In this connection it should be noted that the vertical surfaces 34 and 35 are substantially the same as the vertical dimension of the shuttle, as is the case with the surfaces 60 and 66.

From the foregoing it will be seen that 1 have provided means whereby a shuttle when entering its box can be subjected successively to two different braking or checking forces the first of which. is comparatively light and gradual in the effect it produces, whereas the second operates more abruptly and brings the shuttle to rest quickly. It will also be seen that the protector mechanism spring is employed to assist other springs, the relation being such that the effect produced on the first check is comparatively light, while that exerted on the binder, which becomes'operative as the shuttle nears the end ofitsstroke, I

is not limited to the use of materials as set 2' forthand the brakes and binders may be made of the same material whether that be the kind set forth for the brakes or for the binders.

Having thus described my invention it will be seen that changes and modifications may be made therein by't-hoseskilled in the art without departing fromvthe spirit and scope of the invention and Ido not wish to be limited. to'the details herein disclosed, but 2 what I claim is:

1. In shuttle checkin mechanism forav loom havinga lay along which'a shuttle travels into ashuttle box on the lay, aprotector mechanism, a pair ofshuttle checking members independent of each other and'located one at the inner end of the box and the other at thegouter end of the box, the protector mechanism being operatively related to the member near the inner end of the box to press the latter member against the shuttle, said latter member being ineffective to move the protector mechanism out of loom stopping position, and the other member near the outer end of the box being operatively connected to the protector mechanism and effective to move the latter out of loom stopping position when said outer member is engaged by the shuttle.

2. In shuttle checking mechanism for a loom having a lay along which a shuttle travels into a shuttle box on the lay, a protector finger yielding means tending to move the protector finger to loom stopping position, said finger when in said position efi'ective to protect the loom and when moved from said position efiective to permit continued running of the loom, and a pair of shuttle checking devices each independent of the other and both operatively connected to the yielding means through the finger, one of said means to retard the shuttle by a force derived from the yielding means but inefiective to move the finger from normal position, the other member exerting a force against the shuttle derived from said yielding means and effective when moved by the shuttle to move the finger .away from loom stopping position to permit continued running of the loom.

3. In shuttle checking mechanism for a loom having a lay along which a shuttle travels into a shuttle box on the lay, two independent spaced checking members to engage a shuttle as the latter enters the box, and a yielding pressure exerting loom protector element to be operatively related to each member to cause each member to exert a force against the shuttle, one of said members when moved by the shuttle resisting movement thereof without substantial movement of the protector element and the other of said members when moved by the shuttle effective to give the element a substantial movement.

4. In shuttle checking mechanism for a loom having a lay along which a shuttle travels into a shuttle box on the lay, a yielding pressure exerting loom protector member which when in normal position effects loom stoppage and when moved away from normal position permits continued operation of the loom, and a pair of spaced shuttle check ing elements each operatively related to the member and each independent of the other, the elements coming into operative relation with the shuttle successively to exert pressure derived from the member against the shuttle, the first member to engage the shuttle being ineffective to move the member away from loom stopping position and the second member to be engaged by the shuttle effective to move the element away from normal position to permit continued operation of the loom.

In testimony whereof I have hereunto affixed my signature.

WILLIAM IV. ROBERTSON.

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