US2724413A

US2724413A - Warp threads shedding operation device combined with the weft threads carrying device for circular weaving looms

Info

Publication number: US2724413A
Application number: US234995A
Authority: US
Inventors: Casati Giusto; Cazzaniga Carlo
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-04-28
Filing date: 1951-07-03
Publication date: 1955-11-22
Anticipated expiration: 1972-11-22

Description

Nov. 22, 1955 G. CASATI ETAL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR wmvmc LOOMS Filed July 5, 1951 10 Sheets-Sheet l I N V EN TORS 6 a 5+0 Oasa-h' Cay az z am' a.

l/Michal s, s-m; Rm,

Nov. 22, 1955 Filed July 5, 1951 G. CASATI El AL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEF'I THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS l0 Sheets-Sheet 2 FIG 2 INVENTORS: G-ius-In Cascch' BY Carlo Cazzam'qa,

mama s. snafu Nov. 22, 1955 G. CASATI ETAL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS l0 Sheets-Sheet 3 Filed July 3 1951 INVENTORS 1 Gm 5+0 CaS arla Cazxczm BY i911.

mm: 5. 5mm.

Nov. 22, 1955 G. CASATI ETAL 2,724,413

WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 10 Sheets-Sheet 4 b INVENTORS! a'iusfo Casanh' F/ 7 BY c v azzqm'ga.

WM 5. 8mm

1955 G. CASATI ETAL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS l0 Sheets-Sheet 5 Filed July 5, 1951 INVENTORS Giusf-o Ca Scvh" Carlo (1211111194,

Macaw s. smmvk Nov. 22, 1955 G. CASATI ETAL 2,724,413

WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 5, 1951 10 Sheets-Sheet 6 B' a W \i I N VEN TORS G' 'USID 'asa-h' Y a r/o Ca zzam' 4144mm 5. swim/L qqt- 1955 G. CASATI ETAL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS l0 Sheets-Sheet 7 Filed July 3, 1951 INVENTURfi:

G-ius-fv Casmh' y carlo CaZZQJD'qc Wat/1w 5. Svni/fm aqt 1955 G. CASATI ETAL WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS l0 Sheets-Sheet 8 Filed July 3 1951 INVENTORJ G us'fo Casad' By Car/o Cazzamljm macaw 5 5mm Nov. 22, 1955 G. CASATI ETAL 2,724,413

WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 10 Sheets-Sheet 9 INVENTORP @ius'ho Cascrri y Car/o Caz zam'ga/ 4414mm 6 51714 Kan.

dqt

Nov. 22, 1955- G. CASATI ETAL 2,724,413

WARP THREADS SHEDDING OPERATION DEVICE COMBINED WITH THE WEFT THREADS CARRYING DEVICE FOR CIRCULAR WEAVING LOOMS Filed July 3, 1951 10 Sheets-Sheet l0 BY Carlo Cazz Giusto Casati, Barzano, and Carlo Cazzaniga, Monticello, Italy Application July 3, 1951, Serial No. 234,995

Claims priority, application Italy April 28, 1951 12 Claims. (Cl. 139-16) The present invention relates to a circular weaving loom and more particularly to a circular weaving loom having a warp threads shedding device combined with a weft thread carrying device.

One object of the present invention is to displace the warp threads during the weaving operation as little as possible. t

An additional object of the present invention is to support the displaced warp threads properly during the weaving operation.

A further object of the present invention is to form the device in such a way that the warp threads can be easily inserted.

It. is yet another object of the present invention to provide for a loom stopping mechanism in case one of the warp threads is broken during the weaving operation.

It is still another object of the present invention to increase the shed gradually during the weaving operation.

With the above objects in view, the present invention mainly consists in a circular weaving loom comprising a plurality of healds or heddles to efiect guiding and shedding of the warp threads, a box wherein said healds are annularly arranged in groups, a warp shedding device formed by a plurality of moving members which are mounted to rotate at the rear part of said healds so as to exert a pressure thereon to push them forwardly, a warp stop motion means connected to the shedding device for turning movement therewith and including a feeler formed by a bar and by an arm to which the baris secured, the bar being formed with a threaded hole, a screw threadedly engaging the bar in the hole and formed with an axial bore, a rode extending through the bore, a roller loosely mounted on the rod and positioned so asto engage the rear ends of the healds, the roller having a height which enables it to engage all heald groups, a helical spring wound around the rod, a pin on the rod, a lever engaged by the pin and turnable on the bar of the feeler, the lever being adapted to close an electric loom stopping circuit, a second spring also wound around the rod and exerting a pressure on the pin and thus on the lever to maintain the roller against the healds, and a weft spool carrying device including a weft carrying carriage, a bent needle having a V-shaped cross section tapering toward the lower end of the needle to effect the guiding of the weft thread, and a shed spreader means for moving warp threads from an inner to an outer position at which the picking is eifected.

The weft carrying carriage of the loom comprises a framework of magnetic material, two brackets mounted on the framework, two spindles mounted onthe brackets so as to be able to rotate in their supports, two equal Wheels of magnetic material keyed on the spindles, two equal toothed wheels mounted on the spindles, an electromagnetic roller able to support and to attract the caran upper bow and a lower bow, bothdesigned to be United States Patent wedged between the warp threads and precisely the upper bow in advance in respect to the lower bow, in the movement direction, so that the lower bow may be wedged in only after the gradual increasing of the shed.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. 1 is a diagrammatic perspective view showing the overall construction of the loom;

Fig. 2 is a partly sectioned top View of Fig. 1;

Fig. 3 is a partly sectioned perspective view showing details of the construction in the upper part of the weaving loom to an enlarged scale;

Fig. 4 is a sectioned side view similar to Fig. 3 showing a modified construction;

Fig. 5 is a partial top view showing healds or heddles in displaced position;

Fig. 6 is a partial top view similar to Fig. 5 showing a modification;

Fig. 7 is a partial top View of the device showing a modification of the warp shedding device and the loom stopping mechanism;

Fig. 8 is a left-hand side view of the weft spool carrying device;

Fig. 9 is a top View of the weft spool carrying device;

Fig. 10 is a partial right-hand side view of the weft spool carrying device;

Fig. 11 is an overall partly sectioned front view of the circular weaving loom;

Fig. 12 is a partial top view of the device showing one position of the weft spool carrying device in the relation to the healds or heddles during the weaving operation; and

Figs. 13 to 15 are top views similar to Fig. 12 showing consecutive positions of the weft spool carrying device in relation to the healds.

Referring now to the drawings, and more particularly to Figs. 1 and 11 of the same, the weaving loom according to the present invention comprises a mechanism for the initial shedding motion of the warp threads 1. 0. located at the upper part of the loom. This mechanism mainly consists in an annular hollow box A in which the healds or heddles M are mounted for a sliding motion in radial direction. A plurality of discs are arranged inside the box A for moving the healds M. The loom comprises further a Weft spool carrying device consisting of a weft carrying carriage C and shed opener means E arranged on both sides of the weft carrying carriage C. Further provided are means for propelling the weft spool carrying device and a loom stop mechanism which acts in case of a Warp thread breakage. This stop mechanism is shown in Fig; 7.

The mechanism causing the initial shedding motion of the warp threads will now be described in further detail. The annular hollow box A is mounted by means of a plurality of radial arms a on the hollow drive shaft B for rotation with the same around the shaft axis. The box A (Fig. 11) has an annular top wall 3 to which the free ends of the radial arms a are attached, for instance by screws, an annular bottom wall 4, a cylindrical outer wall 1 and an inner wall 2 concentric with the outer wall 1. The four walls are connected together in any convenient manner for instance by screws (not shown) or by welding to form a substantially dust tight box, which may be filled with lubricating material. The outer wall 1 and the inner wall 2 are provided with a plurality of guide holes h (Fig. 3) which are respectively aligned in radial direction in the outer wall 1 and the inner wall 2 for guiding the rear part of the healds or heddles M for sliding movement in radial direction. The guide holes h are arranged in planes parallel to the top wall 3 and the bottom wall 4, which planes are spaced equally from each other. The guide holes h in consecutive planes are displaced in circumferential direction by equal distances approximately equal to the maximum width of the healds or heddles M. The warp threads 1. o. guided by healds M are, by this arrangement, evenly distributed around the circumference of the weaving loom as can be clearly seen from Fig. 1. Each of the healds or heddles M consists of a rear part 5 guided in the guide openings h of the annular box A and this rear part has a cross section slightly smaller than the cross section of the guide openings It so that the healds M can slide freely within the guide openings. A rectangular cross section is preferred for the rear parts 5 of the healds M, but any other cross section preventing turning of the healds'M in their guide openings may be used. The front part 6 of the healds M is provided with an elongated eyelet 7, best shown in Figs. 3 and 5, through which the warp threads 1. 0. are threaded. The rear part 5 of each heald M extends rearwardly beyond the inner wall 2 and the free ends of the healds M, when the healds are in rest position, are aligned on a circle concentric with the inner wall 2, as clearly shown in Fig. 5. For the exact alignment of the rear ends of the healds M the rear part 5 of each heald is preferably formed with an annular boss 9 which abuts in the rest position of the healds M against the inner face of the inner wall 2 and is pressed against this inner face by a spring 8 surrounding the healds M and inserted between the bosses 9 of the same and the inner face of the outer wall 1 (Fig. 4). Arranged rearwardly of the free ends of the rear portions 5 of the heddles M and within the member A are five

discs

10, 10', 10", 10" and 1N". These discs are equally spaced from each other and mounted on a shaft parallel to the main shaft B. This shaft is mounted for free rotation on two arms 11, 12 (Figs. 3 and 11) which arms are in turn fastened to a sleeve member G which is concentrically arranged about the main shaft B. The member G is rotated about this main shaft in the direction of the arrow R (Figs. l2l5) at a greater number of R. P. M. than the main shaft by means of a pinion I (Fig. 11) meshing with an internal gear integrally formed with the member G. The spacing between the

discs

10, 10', 10", 10', 10 is twice the spacing between the planes in which the healds M are arranged and the discs respectively engage the inner free ends of the healds M so that the healds arranged in every second of the above mentioned parallel planes are engaged and moved in outward direction as the discs rotate in the directionof the arrow R about the central axis of the loom. By this displacement of the healds M the initial shedding b is obtained as 'shown in Fig. 3. After a disc leaves a heald M, the latter is returned to its initial rest position by the spring 8. The spring may also be omitted and in this case the heald M is returned to its rest position by the increased tension of the displaced warp thread or the discs may be magnetized so that they pull the healds M back to the rest position as they leave the free ends of the healds.

Instead of forming the outer portion 6 of the healds with an eyelet as described above the outer portion may be formed with a thin blade 7' as shown in Fig. 6. In this case the warp threads 1. 0. are guided between consecutive side faces 7" of the blades 7' and they are displaced outwardly by the inclined faces 7 when the respective heald is displaced as described above. With this arrangement the warp threads have not to be threaded through eyelets in the healds which greatly simplifies the operation of the loom.

Instead of using round discs as shown in Figs. 3 and 11 star-shaped discs 1012 may be provided, having a plurality of radially arranged arms 10a formed thereon which engage the free inner ends of the healds M. Each of these discs instead of being free to rotate on their spindle may also be driven so as to roll its star-shaped surface on the free inner ends of the healds M and thus exert a push in a predetermined sequence. Such an arrangement is shown in Fig. 7 in which only the uppermost of the star-shaped discs is shown, whereby it is to be understood that a plurality of discs are provided spaced and mounted in a similar manner as the discs shown in Fig. 11.

Fig. 7 shows also the warp stop motion means, that is the mechanism for stopping the loom in case of warp thread breakage. This stopping device consists of an arm 13 extending in lateral direction from the arm 11. This arm 13 is provided near its free end with a threaded opening therethrough and a hollow screw 14 is threaded through this opening. A rod 15 passes through the hollow-screw 14 and is guided therein for sliding motion. A roller 16 is pivotally mounted on one of the free ends of the rod 15 and engages the inner free ends of the healds M. The roller 16 has to be made long enough so that it will consecutively engage all healds M as the device is rotated about the main axis of the loom. A pin 19 extends from the rod 15 at the location between the hollow screw 14 and the roller 16. This pin 19 engages in a slot formed at one end of a double-armed lever 20 which is pivotally mounted at 21 on the arm 13. A coil spring '23 is wound around the rod 15 abutting with its ends, respectively, against screw 14 and the pin 19 and pushing the rod 15 and the roller 16 attached thereto against the free inner ends of the healds M and tending to push the'healds M outwardly. These healds are held as mentioned before in their rest positions by the force of springs '8 or by the tension in the warp threads f. 0. or respectively by a combination of these two forces and the-force tending to push the rod 15 outwardly should not be greater than the combination of the above-mentioned forces. Only when one of the warp threads is broken and the forces preventing the outward movement of the rod 15 are thereby reduced, the rod 15 should be allowed to move in outward direction. For the exact adjustment of the force acting on the rod 15 in outward direction another coil spring 17 is provided which is wound about the other end of the rod 15 and abuts on one side against the other end of the screw 14 and on the other side against a nut 18 screwed on the free end of the rod 15. By adjusting the nut 18 the force of the spring 17 can be varied to counterbalance the force of the spring 23 to 'a greater or lesser degree. The force of the spring 23, on the other hand, can also be adjusted by adjusting the position of the hollow screw 14. When due to the breakage of one of the warp threads 1. o. the roller 16 can move forward under the action of the spring 23, the double-armed lever will tilt about its pivot 21 and the rear end of this lever will abut against the stationary electrical contact 22 and close an electrical circuit which, 'in turn, will cause the stoppage of the drive motor of the loom.

Referring now to Figs. 8 to 15, the means for propelling the weft spool carrying device and the weft spool carrying device itself including the weft carrying carriage C and the means for opening the shed beyond the point obtained by the initial shedding device shall now'be described in further detail.

The means for propelling the weft spool carrying device comprise a magneticroller 24 keyed to shaft 26 which is turnably mounted on the arms 25 extending in radial direction from the sleeve member G (Fig. 11). The roller 24 will rotate about the axis of the main shaft of the loom in the direction of the arrow R together with the sleeve member G. A bevel gear D is fixedly mounted on thehollow shaft B and this bevel gear meshes with .the smaller bevel gear 24' fixedly mounted on the shaft 26 ofthe roller 24. Thevroller .24 will therefore rotate about its own axis while the whole weft spool spectively,

the smooth surface of the wheels.

rotation on stud shafts carrying device rotates about the main axis of the loom. A thrust roller bearing k is conveniently provided between the upper face of the mounting boss of the bevel gear D and the lower face of the member G to reduce the friction between these two members which rotate, as mentioned before, at different speeds. A second roller 28 of a diameter smaller than the roller 24 is mounted for rotation on a shaft 29 which, in turn, is mounted on two arms 27 extending under an angle from the two arms 25. The arrangement is made in such a way that the roller 28 will trail the roller 24 when the device is rotated in the direction of the arrow R.

The weft spool carrying device comprises the weft carrying carriage C which has a supporting plate or frame work 30 of magnetic material from which two brackets 31 and31' extend in a direction substantially normal to the plate 30. These brackets and

brackets

44 and 45, re-

support two

spindles

32 and 33 for free rotation. Two

wheels

34 and 35 of equal diameter and formed from magnetic material are 32 and 33, respectively. Two rings 36 and 37 of nonmagnetic material and having a width smaller than the Width of the

wheels

34 and 35 are respectively tightly fitted on these wheels so that they project slightly from The weft carrying carriage C comprises further a wheel 38 of a diameter smaller than the diameter of the two

wheels

34 and 35. This wheel 38 is also formed from magnetic material and is mounted for free rotation on its spindle 39 which in turn is mounted on a bracket 40 extending from the plate 30 near the bracket 31. Wheel 38 is mounted in relation to the wheel 34 in such a way that the wheel 34 will trail the wheel 38 when the device is rotated in the direction of the arrow R. A toothed wheel 46 is keyed to the free end of the spindle 32 extending beyond the bracket 44 and this toothed wheel meshes with a pinion 48 which is keyed to spindle 50 and has a diameter slightly smaller than the wheel 46. Keyed to the spindle 50 is also a pulley 52 and a belt is wound around this pulley and

smaller pulleys

56 and 58 mounted for free fixedly. connected to the plate 30.

A similar arrangement of gears, pulleys and belts is made on the lower part of the plate 30. A toothed wheel 47 is keyed to the shaft 33 of the roller 35 and this toothed wheel meshes again with a pinion 49 of a slightly M wheel 47.

pulley 53 and a belt 55 is wound in form of a around this pulley 53 and smaller pulleys 57 and 59 mounted in the pair of smaller pulleys mounted for free rotation on stud shafts. Bow-shaped

members

60, 60 aremounted on the plate 30 substantially perpendicular to the same and located respectively adjacent thebelts 54 and 55. The front ends of these bow-shaped

members

60, 6 9' are pointed in the direction of rotation of the weft spool carrying device and are located on this device in such a way that the pointed ends will enter into the initial shed of the warp threads when the device is rotated about the main axisof the loom.

The weft carrying carriage C is further provided with closed loop section and is tapered at its lower end and guides the weft thread during the weaving operation to the apex keyed to the spindle machine by the means described above the roller 24 will rotate in the direction of the arrow X and the roller 28 in the same directions indicated by the arrow X. The

wheels

34 and 35 attracted to the roller 24 by magnetic induction will therefore rotate in the direction of the arrow Y. The

pulleys

52 and 53 driven respectively over the

pinions

46, 48 and 47, 49 will thereby rotate in the direction of the arrow Z. The

belts

54 and 55 respectively wound over the

pulleys

52 and 53 and the small pulleys associated therewith move therefore in the direction of the arrow Z.

The warp thread is brought to the initial shed position by the healds M and the members associated therewith as described above permitting the weft carrying carriage C to be passed through the shed for efiecting the picking whereby the warp threads are displaced further in radial direction by the bow-shaped

members

60, 60. There occurs no displacement of the warp threads in circumferential direction as the weft carrying carriage C is moved about the main axis in the direction of the arrow R whereas the

rollers

24 and 28 and the

wheels

34 and 35 rotate in a direction opposite to the direction R and the device is designed in such a way that the surface speed of these rollers and wheels is the same as the speed with which the whole device rotates about the main axis. The same holds true for the

belts

54 and 55 which move also in a direction opposite to the direction indicated by the arrow R with a surface speed equal to the speed with which the carriage C is rotated.

The gradual displacement of the warp threads in radial drection is clearly shown in the Figs. 12 to .15 which illustrate consecutive steps in the weaving operation. As can be clearly seen from these figures, the displacement of the warp threads occurs very gradually so that these threads are stressed as little as possible during the weaving operation. The displaced warp threads are also properly supported during the displacement by the

belts

54 and 55.

The device for shedding of the warp threads 7. 0. operates in a similar way in the upper and the lower part of the weft spool carrying device. The only difference between the upper shedding device shown in Fig. 8 and the lower part illustrated in Fig. 10 is that the bow-shaped member 60 is made longer than the bow-shaped member 6t). The two members are designed in this way because the member 60 is located as can be seen from Fig. 1 just below the box A in which the healds M for the located and the pointed end of the bow-shaped member 60 can therefore enter into the initial shed b. The lower bow-shaped member 60 is located near the picking apex where the shed b is nearly zero. Consequently, the bow-shaped member 60' finds in the beginning of the weaving operation no opening into which it can wedge itself. Only after the initial shed b is increased by the bow-shaped member 60 and the belt 54 associated therewith the shedding is increased far enough so that the lower bow-shaped member 60 also enters the shed. If desired, the lower bow-shaped member 60 may be extended by a suitable shaped portion towards it will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of circular weaving looms difiering from the types described above.

While the invention has been illustrated and described as embodied in a circular weaving loom having a warp threads shedding operation device combined with the weft thread carrying device, it is not intended to be limited and 35 will thereby be attracted to the details shown, since various. modifications. and structural changes may. be made without departing in any way from the, spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this. invention and, therefore, such adaptations should and are intended to. be comprehended within the meaning and range of equivalence of the following claims.

What is claimed as new and desired to be secured by Letters Patent is:

1'. In a circular weaving loom,,1n combination, a plurality of healds to effect guiding and shedding of the warp threads, a box wherein said healds are annularly arranged in groups, a warp shedding device formed by a plurality of moving members which are mounted torotate at the rear part. of said healds so as to exert a pressure thereonto push them forwardly, a warp stop motion means connectcd to said shedding device for turning movement therewith and including a feeler formed by a bar and by an arm to which said bar is secured, saidbar being formed with a. threaded hole, a screw threadedly engaging said bar in said hole and formed with an axial bore, a rod extending through said bore, a roller loosely mounted on said rod and positioned so as to engage the rear ends of said healds, said roller having a height which enables it to engage all heald said rod, a pin on said rod; a lever engaged by said pin and turnable on said bar of said feeler, said lever being adapted to close an electric loom stopping circuit, a second spring also wound around said rod and exerting a pressure on said pin and thus on said lever to maintain said roller against said healds, and a weft spool carrying device including a weft carrying carriage, a bent needle having a V-shaped cross section tapering toward the lower end of said needle to effect the guiding of the weft thread, and a shed spreader means for moving warp threads from an inner to an outer position at which the picking is eliected.

2. In a loom as defined in claim 1, said healds each being formed by a rod provided with an extending portion of reduced cross section which terminates with a long, narrow eyelet the size of which corresponds to the thread count. 7

3. In a loom as defined in claim 1, said healds being formed by a rod having an extending portion of reduced cross section ending with a straight and thin steel blade forming a side face which guides the Warp thread in cooperation with the similar side face of the succeeding heald, and so on through an entire circle of healds.

4. In a loom as defined in claim 1, said carriage comprising a framework of magnetic material, two brackets mounted on said framework, two spindles mounted on said brackets so as to be able to rotate in their supports, two equal, wheels of magnetic material keyed on said spindles, two equal toothed wheels mounted on said spindles, an electromagnetic roller able to support and to attract the carriage. a smaller wheel of magnetic mate rial rotatably mounted on its spindle and positioned in the groups, a helical spring wound around I:

upper part of said carriage in order to face said electromagnetic roller, an upper bow and a lower bow, both designed to be wedged between the warp threads and precisely the upper bow in advance in respect to the lower bow, in the movement direction, so that the lower bow may be wedged in only after the gradual increasing of the shed.

5. In a loom as defined in claim 4, said shed spreader means comprising two pinions respectively engaging said toothed wheels and being rotatable on their spindles, two pulleys respectively keyed to the latter, two rollers loosely mounted on their spindles, and two belts arranged on said pulleys and on said rollers so as to define two closed paths, whereby a gradual continuous spreading of the warp threads is performed upon rotation of said magnetic wheels.

6. in a loom as defined in claim 1, the moving members of said shedding device being in the form of star-shaped wheels which are turned so as to unwind on healds to exert a push thereon.

7. In a loom as defined in claim 1, said moving members of said shedding device being magnetized and operating by magnetic attraction on said healds to return thelatter to their initial position.

8. In a loom as defined in claim 1, said healds being returned to their normal position by the resilience of the warp threads which exert a push on the healds.

9. In a loom as defined in claim 1, the lower part of said shed spreader means being formed by a suitably shaped and extending'bow piece.

10. In a loom as defined in claim 1', said moving members being in the form of discs.

11'.'In a loom as defined in claim 1, and wherein a means for returning said healds to their initial position is formed by a plurality of springs respectively connected to said healds.

12. In a circular weaving loom, in combination, a main loom shaft; a first magnetic roller parallel to said main loom shaft, spaced therefrom and mounted for rotation about the same on the inside of the warp threads of the loom; a carriage; a second magnetic roller mounted on said carriage adjacent to said first magnetic roller to be attracted to and supported thereby for turning movement therewith about said main shaft, whereby said carriage turns with said second roller about said main shaft; and at least one substantially pointed member extending forwardly from said carriage in the direction of rotation thereof with said first roller to effect spreading of the warp threads.

References Cited in the file of this patent UNITED STATES PATENTS 1,416,344 Feuerstein May 16, 1922 1,930,371 Sery Oct. 10, 1933 2,063,734 Hale et al. Dec. 8, 1936 2,433,824 Ancet Jan. 6, 1948 2,454,146 Exbelent Nov. 16, 1948 FOREIGN PATENTS 395,332 Great Britain Oct. 9, 1931 487,202 Great Britain June 16, 1938 606,352 Great Britain Aug. 12, 1948