DE1243326B - Device for crimping textile yarns - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

DOId

German KL: 29 a -6/20

Number: 1243 326

File number: S 68823 VII a / 29 a

Filing date: June 3, 1960

Open date: June 29, 1967

The invention relates to a device for crimping textile yarns made of thermoplastic threads, Consists of an unheated blade, over the sharp edge of which the unheated thread is pulled.

The deflection of the yarn on the blade gives the yarn a crimp, which is usually through subsequent shrinkage of the yarn in the heat can be intensified.

It is known to crimp thermoplastic threads under tension at an angle drawing a cold, sharp blade and then shrinking it in the heat. In addition is a thread tensioner in front of the blade in the thread running direction and a thread tensioner behind the blade Pair of pulling rollers provided in such a spatial arrangement that the thread is deflected on the blade will. It is also known to guide the thread so that it is between the blade and two im Spaced rollers runs, with the blade in the gap between the Rolls into it and there the thread is deflected around the edge of the blade, but not the blade rests against the roller.

The disadvantage of the known devices is the fact that the pressure with which the yarn at its deflection is pressed against the blade, is determined by the tensile stress with which the thread is pulled over the blade. Contact pressure and tensile stress are therefore not independent of one another selectable, which means that the yarn crimp generated under the contact pressure by the Thread tension is partially released when the crimped yarn is pulled off the blade.

The invention is based on the object of designing a device of the above-mentioned structure in such a way that that the pressing force with which the thread is pulled over the blade, regardless of the Tensile stress in the yarn can be selected.

This object is achieved according to the invention in that a body is provided against which Surface presses the edge of the blade.

In a preferred embodiment, the blade or the body is resiliently mounted. Furthermore or instead, the body can consist of an elastically deformable material. To get the yarn with It is preferable to be able to guide high contact pressure over the blade even when the tension in the yarn is low the body can be moved in the direction of the game to be curled. In this case it is useful designed as a roll or roller. The edge of the blade has a radius of curvature of approximately 0.05 mm. A device for crimping textile yarns is particularly advantageous

Applicant:

Ernest Scragg & Sons Limited,

Macclesfield, Cheshire (UK)

Representative:

Dipl.-Phys. Dr. W. Andrejewski, patent attorney,

Essen, Kettwiger Str. 36

Named as inventor:
Frederick Scragg,
Alexander Albert Chubb,
Macclesfield, Cheshire (UK)

Claimed priority:

Great Britain June 4, 1959 (19 104)

guide shape, which is characterized in that the blade by a spring in the direction of movement of the game is resiliently mounted and against the rigidly mounted role at an angle to the circumferential surface the roller pushes at the point of contact.

The advantages achieved by the invention are essentially to be seen in the fact that the contact pressure of the game to be curled against the edge of the blade regardless of the tension in the Can choose yarn, in particular a crimp of the yarn at high contact pressure and very little Tensile stress is possible, so that the generated when the yarn is deflected around the edge of the blade When the thread is drawn from the blade, the curling is not reversed. Will the yarn against the body pressing the blade is designed as a roller or roller, so it can rotate so quickly, that their outer surface moves at the same speed as the yarn. In this case, the The run-off side of the yarn from the edge of the blade does not require any thread tension.

In the following the invention will be described with reference to the embodiments shown in the drawing explained in more detail; it shows

F i g. 1 in a schematic representation of an inventive Device for crimping textile yarn from thermoplastic threads,

F i g. 2 shows, on an enlarged scale, the arrangement of the blade and body of the device according to FIG. 1,

709 608/345

Claims (7)

F i g. 3 shows another embodiment of the device according to the invention. The device for crimping textile yarns 10 shown in the figures consists of an unheated blade 14, over the sharp edge of which the unheated yarn is drawn, a body 21, 22, 23 being provided against the surface of which the edge of the blade 14 presses . In Fig. 1, the yarn 10, after it has left the rollers 13, runs through between the blade 14 and the roller, which is designed as a roller 21 with a support 22 of flexible material and presses the yarn against the blade 14. From there the yarn runs to the rollers 15 and then undergoes a heat treatment, the device of which is not shown. The roller 21 and the blade 14 are mounted so that they are in resilient contact with one another, the resilient pad 22 serving to guide the yarn 10 around the edge of the blade 14. This process is shown in an enlarged illustration in FIG. 2, from which it can be seen that the edge of the blade 14 is pressed into the support 22 and its surface is locally deformed, so that the yarn 10 is guided around the edge of the blade 14 in this deformation. The radius of curvature of the blade edge is approximately 0.05 mm. In Fig. 3, the pressure body is designed as a roller 23 without a resilient support, but the blade 14 is held in resilient contact with the surface of the roller 23 by a spring 24. The blade 14 is articulated on a fixed part of the device and is pressed by the spring against the rigidly mounted roller at an angle to the circumferential surface of the roller at the point of contact. The blade can swing out in the direction of the yarn movement. The rollers 15 are arranged so that they continue the yarn at a sharp angle from the roller 23, whereby the yarn is deflected on the blade 14 in the desired manner. Of course, other embodiments of such a resilient mounting of the blade 14 can be realized, for example the roller 23 can also be flexibly mounted and pressed against a firmly mounted blade 14, or the blade 14 can be made of resilient material and arranged so that it against the roller 23 is pressed by its own spring force. In both embodiments according to FIGS. 1 and 3, the roller 21, 23 serving as a body is driven in the same direction as the yarn movement, as indicated by the arrows on the rollers. Instead of the rollers 13, 15 other known transport and tensioning devices for the yarn can also be used, provided that the same tension and relaxation conditions of the yarn are achieved in front of and behind the blade, the relaxation of the yarn after leaving the blade 14 being large enough should be that at least a 10% contraction can occur during the subsequent heat treatment of the yarn. Patent claims: 1. Device for crimping textile yarns from thermoplastic threads, consisting of an unheated blade, over the sharp edge of which the unheated yarn is drawn, characterized in that a body (22) is provided, against the surface of which the edge of the blade (14) presses. 2. Apparatus according to claim 1, characterized in that the blade (14) or the body (22) is resiliently mounted. 3. Device according to claims 1 and 2, characterized in that the body (22) from elastically deformable material. 4. Device according to claims 1 to 3, characterized in that the body (22) in The running direction of the yarn to be crimped (10) can be moved. 5. Device according to claims 1 to 4, characterized in that the body (22) as Roll (21,23) or roller is executed. 6. Device according to claims 1 to 5, characterized in that the edge of the blade (14) has a radius of curvature of approximately 0.05 mm. 7. Device according to claims 1 to 6, characterized in that the blade (14) is supported resiliently by a spring (24) in the direction of movement of the yarn (10) and against the rigidly mounted roller (23) at an angle to the peripheral surface of the roller (23) at the point of contact presses. Considered publications:
French Patent No. 1,124,622;
Belgian Patent No. 563,452;
British Patent No. 558 297. 1 sheet of drawings 709 608/346 6.67 © Bundesdruckerei Berlin