US2551172A - Shuttle for electronic loom protection - Google Patents

Description

May 1, 1951 v. F. SEPAVICH SHUTTLE FOR ELECTRONIC LOOM PROTECTION Filed Dec. 6, 1949 II I T W b ATTORNEY.

Patented May 1, 1951 UNITED STATES PATENT OFFICE SHUTTLE FOR ELECTRONIC LOOM PROTECTION Victor F. Sepavich, Worcester, Mass., assignor to Crompton & Knowles Loom Works, Worcester, Mass., a corporation of Massachusetts Application December 6, 1949, Serial No. 131,378

Claims. (Cl. 139-203) This invention relates to improvements in shuttles adaptable more particularly for use with electric protection means for looms and it is the general object of the invention to provide a shuttle having a magnetizable body embedded therein in such manner that it cannot engage the Warp threads of the loom.

In co-pending application Serial No. 81,164 filed March 12, 1949, by Howe and Sepavich there is set forth a form of electric protection employing an electronic circuit controlled by impulses generated in a coil on the lay as the shuttle passes over the coil. If the shuttle is running properly and on time the impulse will be generated at a point in the loom cycle which will permit continued loom operation, but if the shuttle is running behind its correct time the impulse will be generated too late in the cycle and the loom will be stopped.

The shuttle set forth in the aforesaid application has secured to the underside thereof a body of magnetizable material, such as iron or soft steel, but in such position that some wearing of the threads of the bottom warp shed is likely to occur. It is an important object of the present invention to provide at least the bottom of the shuttle with a coating of hard fiber or the like and embed the magnetizable sheet or strip between this coating and the wood of the shuttle. In this way the magnetizable sheet is prevented from ever having contact with the warp threads.

It is a further object of the invention to provide either the body of the shuttle or the fiber base with a recess to receive one or more of the aforesaid strips of magnetizable material and hold them in fixed position without requiring the use of screws or other fastening means which might work loose and rip or break out the threads of the bottom shed.

With these and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of the invention is set forth,

Fig. 1 is a diagrammatic front elevation of part of a loom showing a lay provided with an electric coil and showing two shuttles made according to the present invention,

Fig. 2 is a front elevation of one of the shuttles shown in Fig. 1 having the invention applied thereto,

Fig. 3 is an enlarged transverse vertical section on line 3--3, Fig. 2,

Fig. 4 is a fragmentary longitudinal vertical section on line 4-4, Fig. 3,

Fig. 5 is a detailed horizontal section on line 5-5, Fig. 4, and

Fig. 6 is a diagrammatic view showing the Warp sheds, the shuttle made according to the present invention, and the lay. 2

Referring particularly to Fig. 1, the loom lay H! is supported on swords H and has a shuttle box IE at one end and upper and lower shuttle boxes 13 and Id at the other end, the latter boxes being shiftable by means of a box lifter rod l5 so that either of the shuttle boxes may be moved to active position. The loom is provided with the usual reed I6 and hand rail I1 and the lay has a shuttle race l8 along which the shuttle travels when in flight across the loom. Carried by the lay below the race plate is a permanent magnet 59 wrapped with a wire coil 20 in which an electric impulse is generated when a magnetizable body passes along the race plate over the magnet. The impulse energizes a signal system (notshown) indicating shuttle presence and forming part of a protection means for the loom.

The shuttles SI and S2 for the shuttle boxes 13 and I6, respectively, are the same and a description of one of them will suffice for both.

As shown in Fig. 2, the shuttle SI is made from a wood blank and has a body member '25 with front and back walls 26 and 21, respectively, and a bottom 28. The ends of the shuttle body are pointed in usual manner and are provided with shuttle tips 29. The shuttle is provided with a bobbin cavity 3!! to receive a bobbin B which may be held to the shuttle in any approved manner and have the Weft W thereof led through a delivery eye 3! in the front wall 26. The ends of the wood body 25 of the shuttle may be solid, as indicated at 32 and 33, Fig. 2.

The shuttle thus far described is of common construction and may for instance be of the type ordinarily used on felt looms, but the invention is not necessarily limited to the type of shuttle body set forth herein and the shuttle shown is merely illustrative. Furthermore, the shuttle forming the subject matter of the present invention is not necessarily limited to the shuttle box the bottom of the wood part of the shuttle is recessed as at 31 and has located therein two metallic plates 38 and 39 which are preferably of magnetic material, such as iron or steel. The recess 31 is shallow and of a depth just sufficient to receive the plates 38 and 39, and the latter fit the recess to be held therein against relative movement with respect to the shuttle. The fiber plate 35 extends under the plates 38 and 39 and confines the latter in the recess :31! and in effect embeds the magnetizable plates or strips within the shuttle.

The invention as already mentioned is used in connection with electric protection .means controlled by the coil which is located along the lay at a point between shuttle box 312 Zand the shuttle boxes 13 and [4. The coil and magnet are preferably under the bottom warp she'd BS, see Fig. 6. When the shuttle passes over the magnet the magnetizable body on the shuttle causes an electric impulse to be generated in the coil which is utilized to control the grid of an electronic tube not shown herein but fully described and set forth in the aforesaid copending application. The relative position of the coil and the magnetizable body on the shuttle is set forth diagrammatically in Fig. -6, but it is to be understood that the invention is not necessarily limited to the location of the magnetizable plates 38 and 39 centrally of the shuttle in a transverse direction as shown for instance in Fig. 3. The magnetizable body on the shuttle should preferably be long-enough to bridge the poles '15 and 4! of the ermanent magnet.

I-f 'desired a single strip or body of magnetizable-materialcan be utilized, but I prefer to have at-least two plates which-may preferably be made of thesame material-as that employed for electric transformers, the plates being suitably covered to insulate them from each other to prevent or at least reduce eddy currents as the shuttle passes over the magnet l 9.

From the foregoing it will be seen that the invention sets forth a shuttle having magnetizable material embedded therein and located preferably between the non-magnetizable wood body of the-shuttle and a hard non-magnetizable wear- =ing base 135-madeof some such material as fiber. This base effectively prevents the magnetizable body-from ever having contact with the threads of the bottom shed BS and cooperates with the bodyof the shuttle to hold the plates 38 and 39 in fixed position on the shuttle. The base will be relatively thin so that the magnetizable plates will not be located too far above the magnet l9 to generate the needed impulse in thecoil 20. It will further be seen that the base 35 enables the magnetizable strips to be held in position without the use of tacks, screws or other form of attachment which might work loose as the shuttle is picked back and forth across the loom.

Having thus described the invention it will be seen that changes and modifications of the foregoing specific disclosure may be made without departing from the spirit and scope of the invention.

What is claimed as new is:

1. Ina shuttle for a loom lay having a magnet and coil forming part of a signal system, a shuttle body made of non-magnetizable material, a base made of non-magnetizable material extending continuously along and secured to the bottom of the shuttle body, and a mass of magnetizable material between said body and base.

2. In a shuttle for a loom lay having a magnet andcoil forming part of a signal system, a shuttle body member formed of non-magnetizable material, a base member secured to and extending 'along'the bottom of the body member, one of said members having a recess formed therein, and a mass of magnetizable material located in said recess betweensaid members.

-3. In a shuttle for a loom lay having a magnet and coil forming part of a signal system, a shuttle body made of non-magnetizable material, a smooth uninterrupted base extending along the bottom of the body, and a mass of magnetizable material located between the body and base and entirely inclosed within the shuttle.

4. In a shuttle for a loom lay having a magnet and coil forming part-of a signal system, a shuttle bod-y formed of wood, a hard fiber base secured to and extending along the bottom of the body, anda mass of magnetizable material between the wood.bodyand the fiber base.

5. In ashuttle fora loom lay having a magnet .and coil forming part of a signal system, a shuttle body member formed of non-magnetizable material, a base member formed of non-magnetizable material extending along and secured to the underside of the body member, one of said members having -a recess formed therein, and a mass of magnetizable material located in and fitted snugly into said recess and held in position between=and by cooperation of said members.

VICTOR F. SEPAVICH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 514,232 .Kobertz Feb. 6, 1894 1,368,975 Shambow Feb. 15, 1921 2,172,336 Turner Sept. 5, 1939 FOREIGN PATENTS Number Country Date 181,712 Germany Mar. 16, 1907

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