US2725899A - Weft beating up rotating reed device for circular weaving looms - Google Patents

Description

Dec. 6, 1955 e. CASATI ETAL 2,725,399

WEFT BEATING UP ROTATING REED DEVICE FOR CIRCULAR WEAVING LOOMS 4 Sheets-Sheet 1 Filed July 5, 1951 FIG.|

52; \R J r 4' INVENTORS Gvqs-f'a Casa'h' F t f BY arla Cazzqni mama W aqt- Dec. 6, 1955 Filed July 3, 1951 ASATI G. C WEFT BEATING UP ROTAT FOR CIRCULAR WEA FIGB ETAL 2,725,899

ING REED DEVICE VING LOOMS 4 Sheets-Sheet 2 IN VEN TORS Gui 5+0 cqs d- By cqrllo 41 140190 Muwm 5. 6mm. qqt.

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nited States Patent '0 WEFT BEATING UP ROTATING REED DEVICE FOR CIRCULAR WEAVING LOOMS Giusto Casati, Barzano, and Carlo Cazzaniga, Monticello, Italy Application July 3, 1951, Serial No. 234,994 Claims priority, application Italy December 14, 1950 12 Claims. (Cl. 139-13) The present invention relates to a weft beating up rotating reed device and more particularly to a weft beating up rotating reed device for circular weaving looms.

One object of the present invention is to form such a reed device in which the beating up of the weft thread is performed very gradually.

Another object of the present invention is to construct such a reed device from few and sturdy parts which will act trouble-free over a long period of time.

A further object of the present invention is to construct such a reed device from parts which can be manufactured at a reasonable cost.

With the above objects in view the present invention mainly consists in a weft beating up device for circular weaving looms comprising a shaft, an annular hollow casing having an inner cylindrical side surface and being mounted on the shaft adjacent an end portion thereof for free rotation about the axis of the shaft, the end portion of the shaft being located within the casing and the latter having an open end beyond the end portion of the' shaft; a disc fixed to the end portion of the shaft so as to be immovable with respect to the latter, extending transversely to the shaft axis, and having an annular peripheral portion located apart from and facing the inner side surface of the casing to define an annular space with the latter, the peripheral portion of the disc being formed about its entire periphery with an endless groove facing the inner side surface of the casing, having a first curved part extending toward the open end of the casing, a second curvedpart forming an extension of the first curved part of the groove and extending into the casing away from the open end thereof, and the groove having a third part longer than the first and second parts, communicating with and forming an extension of the latter, and being located more distant from the open end of the casing than the first and second parts of the groove, and a plurality of elongated, identical bar members located next to each other in the annular space between the disc and casing, each of the bar members having a projection located in the groove of the disc, having a substantially pointed free end portion extending from the projection toward the open end of the casing and being of substantially the same length as the distance between the open end of the casing and the third part of the groove, and the bar members each having a width approximately equal to the width of the annular space between the disc and casing, whereby rotation of the latter on the shaft causes the bar members to have their free end portions successively moved beyond the open end of the casing and back toward the casing by engagement of the projections of the bars with the first and second parts of the groove of the disc.

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 front view of the device according to the present invention with a part of the warp threads broken away;

Fig. 2 is a sectional view of the device according to the present invention, the section being taken along the line 22 of Fig. 1 in the direction of the arrows;

Fig. 3 is a fragmentary partially sectional side view showing the over-all structure of the device;

Fig. 4 is a diagrammatic front view similar to Fig. 1;

Fig. 5 is a top view of a disc as seen in the direction of the arrow A of Fig. 4;

Fig. 6 is a top view of the bar members also viewed in the direction of the arrow A of Fig. 4;

Fig. 7 is a bottom view of the member illustrated in Fig. 5 seen in the direction of the arrow B of Fig. 4;

Fig. 8 is a bottom view similar to Fig. 6 seen in the direction of the arrow B of Fig. 4;

Fig. 9 is a front view similar to Fig. 1 showing the operation of the device; and

Fig. 10 is a sectional view also illustrating the operation of the device, the section being taken along theline 1010 of Fig. 9 in the direction of the arrows.

Referring now to the drawings, and more particularly Figs. 1, 2 and 3 of the same, the construction of the weft beating up rotating reed device is shown in Figs. 1 and 2 whereas Fig. 3 shows the mounting of the device on the loom shaft C. As seen in Fig. 2, the reed device comprises an annnular hollow casing 4 inside ofwhich an annular cylindrical member 10 is attached, for instance by means of screws. The inner face of the annular casing 4 and the outer face of the annular cylindrical member 10 define between themselves an annular space 5. The casing 4 has an open end and a spherically formed flange portion 4 surrounding the open end of the casing. The spherical radius r of the outer face of the flange portion 4' has its center in the axis of shaft C and is equal or slightly smaller than the radius R of a circle along which the warp threads extend in the direction of the axis of shaft C. The members 4 and 10 are mounted for free rotation about the shaft 1 by means of the ball bearing 2. Fixedly secured to the end of the shaft 1 and also within the hollow casing 4 is a disc 9 having a peripheral portion 7 provided with a groove 11 (Figs. 5 and 7). A plurality of elongated and identical bar members 6 are located next to each other in the annular space 5 between the annular cylindrical member 10 and the disc member 9 on one side, and the annular hollow casing 4 on the other side. Each of the bar members 6 has a projection 8 located in the groove 11 of the disc 6 and a substantially pointed free end portion 6' which extends from the projection 8 toward the open end of the casing 4. The bar members 6 are located in a vertical plane and fill the groove 5 completely. Thus, each bar presses against the neighboring bar as the bars are located in a vertical I groove 5 the pressure of one bar 6 on a neighboring bar 6 has a component for each bar 6 which acts in radial. direction outwardly from the center of shaft 1 toward the inner face of the member 4, whereby the bars are frictionally held against the member 4 and are moving together with this member when the same is rotated, while being capable of moving axially by cooperation of the bar extensions 8 with the groove 11 of the disc 9.

Fixedly connected to the annular casing 4 and the annular cylindrical member 10 is a bevel gear 3,1ater on also called first gear. This gear 3 meshes with a second gear D (Fig. 3) which latter gear is fixedly attached tosupport arm 12 which extends in a direction normal to the axis of the main shaft C of the loom from a hollow member M surrounding the loom shaft. The position of the shaft 1 in the hollow arm 12 is fixed and the shaft prevented from rotation in the hollow arm 12 by a pair of set screws, as shown in Fig. 3. The member M is mounted for rotation in the direction of the arrow b on a ball bearing fixed to shaft C and is driven by a pinion 13 mounted in the hollow shaft C and engaging with gear teeth formed on the inside of the member M. The pinion 13 is driven by a shaft 14 located inside the hollow shaft C.

Thus, when the shaft C and the member M are rotated the casing 4 will rotate about the shaft 1 in the direction of the arrow :1 and the reed device will at the same time rotate about the axis of the loorn shaft C in the direction of the arrow b. It should be noted that the shaft 1 and the disc 9 fixedly attached thereto will thereby rotate only about the axis of the loom shaft C but notabout its own axis as the shaft 1 is held stationary in the hollow support arm 12.

The endless groove 11 formed in the disc 9 is best shown in Figs. 5 and 7. The groove 11 comprises a first curved part 15 extending toward the open end of the casing 4 when the disc 9 is mounted in the casing 4 as shown in Fig. 2, a second curved part 16 forming an extension of the first part 15 and extending into the casing 4 away from the open end of the same, and a third part 17. This third part 17 is longer than the first part 15 and the second part 16, communicates with and forms an extension of the second part and is located more distant from the open end of casing 4 than the first and second parts of the groove 11. As indicated in Fig. 4, the first and the second part of the groove extends each through an angle of about 20, and the third part 17 of the groove extends approximately through an angle of 320. Fig. 7 also shows clearly that the second part 16 of the the groove has an end portion 16' which curves away from the open end of the casing 4 by an angle sharper than that with which the first part 15 of the groove approaches the open end of the casing 4.

The operation of the device can be best seen from the Figs. 9 and 10 when taken in conjunction with the Fig. 3 which shows the overall construction of the device and its mounting on the loom.

As mentioned before, the reed device will rotate, when the main shaft C of the loom is rotated, about the axis of the shaft C in the direction of the arrow b. At the same time the casing 4 and the cylindrical member attached thereto will be driven by the gears G and 3 and rotate therefore about the axis of the first shaft 1 on which the casing 4 and the cylindrical member 9 are mounted for free rotation.

The weft thread Ft is fed into the warp shed by the weft thread carrier in a plane slightly higher than the plane indicatedby the lines TT' in Fig. 9. This plane indicates the top of the already finished fabric and is (as is clearly shown in Fig. 9) tangential to the circle formed by the outer faces of the bar members 6. The pointed ends 6' of the bar members 6 are flush with the end face of the hollow casing 4 when the projections 8 of the bar members 6 are engaged in the third part 17 of the disc groove 11 and as this face of the spherically formed flange portion 4 is formed along a radius r equal or slightly smaller than the radius R of the circle along which the warp threads extend about the axis of the loom shaft, the pointed end 6' will just about touch the warp threads. When during the rotation of the reed device about the axis of the first shaft 1 the projections 8 of the bar members 6 are located in the first part 15 of the disc groove, the pointed ends 6' of these bar members, which are spaced from each other a distance approximately equal to the spacing of the warp threads, will be pushed outwardly beyond the spherical face of the casing 4 and enter thereby between the warp threads fo. In this position, the

pointed ends 6 of the bar members come in contact with the weft thread Pt and push the weft thread Ft, during the rotation of the device, from the position in which the weft thread is fed between the warp threads to the finished position indicated by line T-T'. The beating up of the weft threads occurs as the bar members 6 rotate through the angles d and e indicated in Fig. 4 whereby the members 6 are advanced during the rotation through the angle [1 and retracted during rotation through the angle e. It should be noted that the retraction of the members 6 occurs much faster than the advance of the same, as the rise of the first part 15 of the groove is much more gradual than the drop of the end portion 16 of the second part 16 of the groove.

It should be noted further that during the rotation the pointed ends 6 of the bar members projecting between the warp threads cooperate with the warp threads in a manner similar as a pinion meshing with a rack and this cooperation between the pointed ends of the bar members 6 with the warp threads f0 prevents also an angular displacement of the bars 6 with respect to the casing 4.

By the insertion of the pointed ends 6' between the warp threads fo the spacing between the warp thread is also adjusted so that the device acts as a reed.

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 a weft beating up rotating reed device for circular weaving looms differing from the types described above.

While the invention has been illustrated and described as embodied in a weft beating up rotating reed device, it is not intended to be limited 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:

l. A weft beating up device for circular weaving looms, comprising, in combination, a shaft; an annular hollow casing having an inner cylindrical side surface and being mounted on said shaft adjacent an end portion thereof for free rotation about the axis of said shaft, said end portion of said shaft being located within said casing and the latter having an open end beyond said end portion of said shaft; a disc fixed to said end portion of said shaft so as to be immovable with respect to the latter, extending transversely to said shaft axis, and having an annular peripheral portion located apart from and facing said inner side surface of said casing to define an annular space with the latter, said peripheral portion of said disc being formed about its entire periphery with an endless groove facing said inner side surface of said casing, having a first curved part extending toward said open end of said casing, a second curved part forming an extension of said first curved part of said groove and extending into said casing away from said open end thereof, and said groove having a third part longer than said first and second parts, communicating with and forming an extension of the latter, and being located more distant from said open end of said casing than said first and second parts of said groove; and a plurality of elongated, identical bar members located next to each other in said annular space between said disc and casing, each of said bar members having a projection located in said groove of said disc, having a substantially pointed free end portion extending from said projection toward said open end of said casing and being of substantially the same length as the distance between said open end of said casing and said third part of said groove, and said bar members each having a width approximately equal to the width of said annular space between said disc and casing, whereby rotation of the latter on said shaft causes said bar members to have their free end portions successively moved beyond said open end of said casing and back toward said casing by engagement of said projections of said bars with said first and second parts of said groove of said disc.

2. A weft beating up device as defined in claim 1 and wherein said open end of said casing has a curved end face formed along an arc whose center is located in the axis of said shaft and at a substantial distance from said end portion of said shaft.

3. A weft beating up device as defined in claim 1 and wherein a gear is located about said shaft and fixed to said casing to transmit rotation to the latter.

4. A weft beating up device as defined in claim 1, an annular, cylindrical member of the same diameter as said disc being located in said casing on the opposite side of said disc from said open end of said casing and being fixed to the latter for rotation therewith, each of said bar members having end portions opposite to said pointed free end portions thereof and extending into the space between said annular cylindrical member and said inner side surface of said casing so as to be guided for movement toward and away from the area beyond said open end of said casing.

5. A weft beating up device as defined in claim 1, a vertical loom shaft; support means carrying said firstmentioned shaft in a position where it extends perpendicularly from the axis of said loom shaft and mounting said first-mentioned shaft for rotation in a horizontal plane about said loom shaft while extending perpendicularly therefrom; a first gear fixed to said casing to transmit rotation to the latter; and a second gear mounted on the loom about said loom shaft and engaging said first gear to impart rotation to the latter and said casing therewith upon movement of said first-mentioned shaft about said loom shaft.

6. A weft beating up device as defined in claim 5 and wherein said first and second parts of said groove of said disc are located at the bottom of the latter.

7. A weft beating up device as defined in claim 6 and wherein said first and second parts of said groove of said disc extend through approximately 40 while said third part of said groove extends through approximately 320.

8. A weft beating up device as defined in claim 7 and wherein said first and second parts of said groove each extend through approximately 20.

9. A weft beating up device as defined in claim 5, and wherein said open end of said casing has a curved end face formed along an arc whose center is in the axis of said loom shaft and in the axis of said first-mentioned shaft.

10. A weft beating up device as defined in claim 1 and wherein said first and second parts of said groove of said disc extend through approximately 40 while said third part of said groove extends through approximately 320.

11. A weft beating up device as defined in claim 10 and wherein said first and second parts of said groove each extend through approximately 20.

12. A weft beating up device as defined in claim 1 and wherein said second part of said groove of said disc has an end portion distant from said first part of said groove and curving away from said open end of said casing by an angle sharper than that with which said first part of said groove approaches said open end of said casing so that said bar members are moved into said casing at a faster rate than they are moved out of said casing.

References Cited in the file of this patent UNITED STATES PATENTS

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