US3087299A - Balloon-control on false-twist spindle - Google Patents

Description

April 30, 1963 J. J. MERTENS BALLOON-CONTROL ON FALSETWIST SPINDLE 2 Sheets-Sheet 1 Filed NOV. 24, 1961 f/A l/ AAA INVENTOR.

JOHAN JACQUES MERTENS ATTORNEY April 30, 1963 J. J. MERTENS 3,087,299

BALLOON-CONTROL ON FALSE-TWIST SPINDLE Filed Nov. 24, 1961 2 Sheets-Sheet 2 I NVENTOR Jo/zm Jacques Marie/as TTORNEYS 3,087,299 BALLOON-CONTRGL N F ALSE-TWIST SPINDLE Johan J. Mertens, Arnhem, Netherlands, assignor to N.V.

Gnderzoekingsinstitnut Research, Arnhem, Netherlands, a corporation of Netherlands Filed Nov. 24, 1961, Ser. No. 154,592 Claims priority, application Netherlands Dec. 6, 1960 6 (Zlaims. (Cl. 57-77.3)

This invention relates in general to a thread twisting apparatus and more particularly to an improved false twisting device of the rotating tube type.

It is known to impart twist, particularly false twist, to thread by the use of a rotating tube of the type to which this invention generally relates. In utilizing the teachings of the prior art a hollow cylindrical tube is rotatably mounted in bearings which are supported from a stationary housing. The conventional manner of rotating the tube is by the use of a drive belt which engages a pulley section of the outer periphery of the tube and thus imparts rotation thereto. Near the discharge end of the tube there is rigidly mounted an encircling body of a hard material. This body is provided with a bore having an axis normal to the axis of the rotatable tube. The thread passes through the longitudinal opening in the tube, outward of the tube, longitudinally through the bore of the encircling body, one or more times around the outermost portion of the encircling body and then to conventional feed rollers. The tube is rotated by conventional means and a uniform twist is imparted to the thread fed therethrough. A system of the type described is shown in Patent No. 2,655,781 and a false twister of the type shown in Patent No. 2,893,198 may be used in such a system.

While the false twisting device described above has been used commercially for crimping threads, it has been found that from time to time yarn breakage occurs. Yarn breakage causes long operational delays since the yarn must be rethreaded through the settling and false twisting devices. Furthermore, each time there is a yarn breakage, a length of yarn is drawn off which is not crimped and which must therefore be later separated from the finished crimped yarn.

It has been very difiicult to ascertain the cause of yarn breakage in a system of this type because the velocity and tension of the yarn are very high, but nevertheless, by use of the present invention breakage is greatly reduced.

It is therefore an object of this invention so to improve false twisting apparatus of the type shown in Patent No. 2,893,198 that the number of yarn breakages per unit of operating time is greatly decreased.

By use of the present invention, production is interrupted far less frequently and there is a corresponding reduction in the number of instances when the removal of lengths of uncrimped yarn from finished crimped yarn bodies is required.

Other objects and advantages of the invention will be apparent from the following detailed description of a preferred embodiment thereof in conjunction with the annexed drawings, FIGURE 1 of which is a partial sectional view taken along the axis of rotation of a false twisting device constructed in accordance with the principles of the present invention, and FIGURE 2 is a sectional view of the same device as shown in FIGURE 1 with the jacket 24 bisected to show the position of the thread in relation to the spindle and the jacket.

Referring to FIGURE 1 in greater detail, the false twisting device indicated generally by reference numeral is rotatably supported by ball bearings 11 within the core 12 of a stationary housing 13. The housing 13 may be attached in any conventional manner to the frame of tent "ice

the thread processing machine (not shown). The false twisting device includes a rotatable body 14 having therethrough an axial bore 15. A portion of the outer surface of the rotatable body 14 lies within housing 13-. This portion is mounted in the bearings 11 for free rotation.

Beyond the housing 13, the body 14 is provided with an integral sheave 16 adapted to co-act with a belt 17 by which it is rotated in a manner known to the art. A small cylinder 18 of hard material is cemented to the upper end of the protruding part of the body 14. This cylinder 18 is provided with an axial bore at 19 and has a fiat external face at 20. In the region indicated by the numeral 21 the protruding part of the rotatable body 14 is flattened on two sides. It is also provided with a transverse hole at 22 which communicates with the upper end of the bore 15. At the point of intersection of the bore 15 with the hole or aperture at 22, there is located a guiding eyelet 23 of a hard material. This eyelet is cemented into an enlarged cavity at the end of the bore 15. Tightly fitted over the protruding part of the rotatable member 14, there is a jacket 24. This jacket may be cylindrical. It slides over the rounded portion and defines with the flats at 21 two elongated spaces of segmental cross-section. One end of the jacket 24 is near the guiding eyelet 23 and the other end is near the bore 19 through the cylinder 18. The cross-section of the jacket 24 is unimportant so long as it allows space for the threads between the flats at 21, its own inner wall, and so long as it fits the member 14 snugly.

To commence the use of the device shown in the drawings a thread 25 supplied from a conventional twist stop (not shown) is pulled through the bore or channel 15 and then twice pulled through the channel 19 so that the angle of wrap is about 500. The thread 25 is then lead over a thread discharge device (not shown). As soon as the thread supply device and the thread discharge device have been started and rotation of the false twister has been brought about by action of the belt 17, the portion of the thread between the stop and the cylinder 18 is twisted. This twist may, in the case of thermoplastic yarns, be fixed by heating followed by cooling. The twist is removed from the thread in a step in the process which is accomplished beyond the guide 18. Since the filaments are fixed in the form of a helical line, a high stretch thread is obtained.

The thread 25 runs inside the jacket 24 which is a sliding fit over the part of the rotatable body in which the guiding members are located. The choice of dimensions is such that it is possible to cement the cylinder 18 in position and thereafter to slide the jacket 24 into position. When the jacket 24 is in position the bore of the cylinder 18 is unobstructed, but the jacket nevertheless surrounds the lower portion of the cylinder. The jacket 24 has the additional advantage that the thread may be lead through the bore and subsequently around the wall of the guiding member. A similar advantage is obtained with regard to threading the yarn through the bore of the rotatable body when the jacket is near that bore.

What is claimed is:

1. A thread twisting apparatus comprising a rotatable body having a thread passageway extending axially part way therethrough, an elongated encircling guiding member of wear-resistant material having a bore therethrough, said member being rigidly mounted on said body adjacent one end thereof and spaced from one end of said passageway with its bore at an angle to said passageway and a sleeve rotating with said body and frictionally connected to and defining with a portion of said body a yarn passageway of large cross-section between said one end of said passageway and an end of said guiding member.

2. A thread twisting apparatus comprising a rotatable body having a thread passageway extending axially part way therethrough, an elongated encircling guiding member of wear-resistant material having a bore therethrough, said member being rigidly mounted on said body adjacent one end thereof and spaced from one end of said passageway with'itsbore at an angle to said passageway and a sleeve defining with a portion of said body a yarn passageway of large cross-section between said one end of said passageway and an end of said guiding member, said sleeve being slidable onsaid rotatable body and having a cross-sectionalarea adequate to clear said guiding member whereby the sleeve may be applied to the re tatable body member by sliding in an axial direction over the guiding member.

3. A thread twisting apparatus comprising a rotatable body having a thread passageway extending axially part way therethrough, an elongated encircling guiding member of wear-resistant material having a bore therethrough, said member being rigidly mounted on said body adjacent one end thereof and spaced from one end of said passageway with its bore at an angle to said passageway and a sleeve rotating with said body and frictionally connected to and defining with a portion of said body a yarn passageway of large cross-section between said one end of said passageway and an end of said guiding member, said sleeve overlying a portion of said guiding member but 25 body having a thread passageway extending axially part way therethrough, an elongated encircling guiding member of wear-resistent material having a bore therethrough, said member being rigidly mounted on said body adjacent one end thereof and spaced from one end of said passageway with its bore at an angle to said passageway, said body having flat areas between said guiding member and said one end of said passageway, a sleeve rotating with said body and frictionally connected to a portion of said body and overlyingsaid flat areas to define spaces between said one end of said passageway and an end of said guiding member.

5. A thread twisting apparatus as claimed in claim 4 in which the fiat areas are on opposite sides of the rotatable body and intercommunicate through a large port which intersects said one end of said passageway.

6. A thread twisting apparatus as claimed in claim 4 in which said one end of said passageway is defined by a guiding eyelet of hard material.

References Cited in the'file of-this' patent UNITED STATES PATENTS 2,855,750 Schrenk et a1 Oct. 14, 1958 2,981,048 Burnell Apr. 25, 1961 FOREIGN PATENTS 1,136;4l3' France Dec. 29, 1956

Claims (1)

1. A THREAD TWISTING APPARATUS COMPRISING A ROTATABLE BODY HAVING A THREAD PASSAGEWAY EXTENDING AXIALLY PART WAY THERETHROUGH, AN ELONGATED ENCIRCLING GUIDING MEMBER OF WEAR-RESISTANT MATERIAL HAVING A BORE THERETHROUGH, SAID MEMBER BEING RIGIDLY MOUNTED ON SAID BODY ADJACENT ONE END THEREOF AND SPACED FROM ONE END OF SAID PASSAGEWAY WITH ITS BORE AT AN ANGLE TO SAID PASSAGEWAY AND A SLEEVE ROTATING WITH SAID BODY AND FRICTIONALLY CONNECTED TO AND DEFINING WITH A PORTION OF SAID BODY A YARN PASSAGEWAY OF LARGE CROSS-SECTION BETWEEN SAID ONE END OF SAID PASSAGEWAY AND AN END OF SAID GUIDING MEMBER.

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