US3740939A

US3740939A - Multi purpose device for the texturizing of textile threads by false twist

Info

Publication number: US3740939A
Application number: US00187798A
Authority: US
Inventors: J Neveux
Original assignee: Moulinage et Retorderie de Chavanoz SA
Current assignee: Moulinage et Retorderie de Chavanoz SA
Priority date: 1970-10-12
Filing date: 1971-10-08
Publication date: 1973-06-26
Anticipated expiration: 1990-06-26
Also published as: BE773377A; LU64043A1; FR2109364A5; CA941697A; DE2150541A1; NL7113866A; GB1325966A

Abstract

A multi-purpose device for texturing textile threads by application of false twist comprising a false twist tube having a cross-pin for engagement with a thread passing therethrough, a pair of rotatable cylinders having frictional inner surfaces for engagement with a thread passing therethrough, means mounting the false twist tube for rotation in tangential contact with the pair of rotatable cylinders, and thread guide means positioned upstream and downstream of the cylinders and tube for directing the thread in selected paths to and from the false twist tube and cylinders.

Description

O United States Patent 11 1 1111 3,

Neveux June 26, 1973 MULTl-PURPOSE DEVICE FOR THE 3,537,250 11/1970 Mackintosh 57/77.4 TEXTURIZING 0 TEXTILE THREADS BY 3,695,020 10/1972 Richter 57/77.4 FALSE TWIST FOREIGN PATENTS OR APPLICATIONS [75] Inventor; Jacques Neveux Riorges France 850,079 9/1960 Great Britain 57/77.4

[73] Assignee: Moulinage Et Retorderie De Primary Examiner Donald Watkins I Chavanoz Chavanoz, France Attorney-Norman C. Armitage, Luke .I. Wilburn, .I r. [22] Filed: Oct. 8, 1971 et al.

A l. N 1 pp 0 87,798 7 ABSTRACT A multi-purpose device for texturing textile threads by [30] Fore'gn Application Data application of false twist comprising a false twist tube Oct. 12, 1970 France 7037046 having a c ogs-pin for engagement with a thread passing therethrough, a pair of rotatable cylinders having [52] US. Cl. 57/77.45 f i ti l i ner urfaces for engagement with a thread Illt- 8 U 8 g passing therethrough, means mounting the false twist Field of Search 77-45, 34 R tube for rotation in tangential contact with the pair of rotatable cylinders, and thread guide means positioned References Cited upstream and downstream of the cylinders and tube for UNITED STATES PATENTS directing the thread in selected paths to and from the 3,066,473 12/1962 Maeda 57 77.4 false twist tube and cylinders- 9 Claims, 7 Drawing Figures PAIENIEUJUIIZG B73 smears nlvmon JACQUIS nmrx PATENTEUJUIIZS ms FIG.6

ml JAN!!! mu:

MULTI-PURPOSE DEVICE FOR THE TEXTURIZING E TEXTILE THREADS BY FALSE TWIST The present invention concerns a new multi-purpose device for the texturing of textile threads by false twist. Until now the texturizing of a thread by false twist was done either by means of devices comprising a false twist tube, or spindle, in which the thread passes and which, by rotation, gives the thread a temporary overtwist which is set thermally, or by means of devices which give the thread a temporary over-twist by friction of the thread against a surface, also set thermally.

Many devices for the execution of the forementioned processes are known. Thus French Pat. No. 1,239,013, and its addition 80,499, describe a classical false twist spindle in which the false twist spindle is driven in rotation by tangential contact with cylinders with parallel axes, at least one of the cylinders being driven in rotation, the spindle being pressed against the cylinders by a magnet.

Also, French Pat. 1,284,485 and Italian Pat. 698,343 describe devices for false twist by friction formed of two hollow cylindrical elements, with parallel axes and turning in opposite directions, the thread passing inside these cylinders and rubbing against the edges of the cylinders which are formed of a material with a high coefficient of friction.

Now, and this is the object of the present invention, a new device has been found which allows to perform either classical false twist or false twist by friction, by simple modification of the path of the thread in said device. Such a device is therefore very advantageous by the fact of its multi-purpose which allows, according to market requirements and the nature of the threads treated, to obtain indifferently, on the same equipment and without modification to it, either classical textured threads or threads textured by friction.

The device for texturing by false twist according to the invention comprises at least one tube having a bar (or pin) mounted for turning in tangential contact with two cylinders with parallel axes, turning in the same direction, the turning tube being pressed against the cylinders by magnetic means, and it is characterized in that in one part at least one of the cylinders has a longitudinal conduit which has on the inside at least one element of friction and that, in the other part, elements for the return of the thread are arranged upstream and downstream of the two hollow cylinders.

Preferably, the two cylinders are hollow and comprise friction surfaces at their extremities, of a material with a high coefficient of friction, said surfaces being preferably curved.

Also, the elements for the return and guiding of the thread, placed up and downstream of each hollow cylinder, allow passing the thread either in the spindle, or tube, which allows to give it a classical false twist, or in at least one of the cylinders provided with friction elements.

Preferably, as a return element, circular guides are used whose diameter is large and advantageously larger than 8 mm in order not to block the twist given the thread by the friction elements.

In the case where one wishes to false twist by friction, the guiding means allow numerous combinations in the path of the thread.

In one form of embodiment, the false twist device according to the invention comprises at least two return i more than two return guides placed up and downstream of each of the hollow cylinders so that the thread, during its treatment, passes in both hollow cylinders, the direction of passage of the thread in the second hollow cylinder being either opposite or identical to the direction of passage of the thread in the first cylinder, the thread being placed in contact with all the friction surfaces or only with certain of these surfaces.

Preferably, the position of at least one of the return guides is adjustable and the guides are advantageously off-center with respect to at least one of the longitudinal axes of the hollow cylinders.

These return guides allow operation in several different manners.

Thus, work is done in accumulation of twist until the thread is passed either in a single hollow cylinder, or in both cylinders, the direction of passage of the thread in the second being the same as in the first, this mode of passage of the thread leading to very elastic threads, of the mousse type.

Also, less elastic threads can be obtained by passing the thread in both hollow cylinders, the direction of passage of the thread in the second hollow cylinder being opposite to that in the first hollow cylinder.

Finally it is evident that such a device can be used on any machine for false twist, whether fixed or not, and particularly on machines having a thread cooling section after the setting oven, as described in French Pat. 1,583,799.

The present invention is better understood from the following example of execution, as well as from the accompanying drawings.

FIG. I shows schematically an overall view of a texturing loom equipped with a device according to the invention.

FIG. 2 shows a schematic view of the device according to the invention.

FIG. 3, which is a variant of FIG. 1, shows an example in which the path of the thread is modified and extended after the exit from the heat-setting oven.

FIGS. 4, 5 and 6 show various possibilities of execution of the device according to the invention, the twists given by the friction elements being cumulative.

FIG. 7 shows an example in which the twist given by the first hollow cylinder is at least partially cancelled by that given in the second hollow cylinder.

As can be seen in FIG. 1, which is a schematic view of a loom for texturing by false twist, a thread 1 stocked on a spool 2 is unwound by a driven thread delivery device 3 and then passes in a heating box 4 before being subjected to the action of a false twist device 5. It is then drawn by a second thread delivery device 6 and finally rewound in the form of a spool 7.

The execution and the operation of a false twist device 5, according to the present invention, are illustrated by FIG. 2. As can be seen in FIG. 2, this false twist device consists of a revolving spindle 8 mounted in tangential contact with the two sets of

disks

11, 12, I3 and 14 integrally attached to the two cylinders 9 and 10 with parallel axes. The spindle 8 is pressed against disks ll, 12, 13, 14 by magnetic means not represented in the diagram. Also, the driving in rotation of the assembly is done by a belt 15 which drives cylinder 9 tangentially. For the sake of clarity this diagram does not show the bearings in which the hollow cylinders revolve.

Each of the two cylinders 9 and comprises a

longitudinal conduit

16 and 17, the

friction elements

18, 19 and 20 and 21 being placed at the extremities of the two conduits l6 and 17. Also,

return rollers

22, 23, 24, 25, 26, 27 and 28 are placed upstream and downstream of the two hollow cylinders 9 and 10 and allow modifying the path of the thread in the false twist device.

In a practical form of execution the length of the ho]- low cylinders is near 100 mm and the inside diameter of the conduit is 3 mm, a funnel shaped friction element being placed at each extremity of the hollow cylinders.

The operation of this device is the following:

The belt drives in rotation cylinder 9 which communicates its movement of rotation to spindle 8 by means of rollers or

disks

13 and 14, the spindle 8 in turn driving cylinder 10 by means of rollers or disks 1 1 and 12. Consequently the two cylinders 9 and 10 turn in the same direction.

As can be seen in FIG. 2, the thread at the exit from the oven 4 can pass either directly in the false twist spindle 8 before being rewound, the path being represented in long and short dashed lines 1a in the diagram or, by means of return elements 22 and/or 23 and/or 24 and/or 25 and/or 26 and/or 27, the thread can pass inside

conduits

16 and 17 of the hollow cylinders, and thus come to rub on the friction surfaces 21 and/or and/or 19 and/or 18, one of the possible paths being represented in dashed lines lb.

FIG. 3 shows an example in which the path of the thread is modified after the exit from the setting oven which allows, during high speed treatments, to obtain a better cooling, a better distribution of the twist, and consequently a thread having uniform properties along its entire length.

Also, FIGS. 4, 5, 6 and 7 show various possibilities of paths for the thread. On these figures only the

friction surfaces

18, 19, 20, and 21 and the return elements have been shown schematically.

FIG. 4 shows a path with contact of the thread 1 on two

friction elements

20, 21 placed at both extremities of tube 9, the twist given by surface 20 being of the same direction as that given by surface 21.

FIG. 5 shows a path with contact of the thread on three friction surfaces, the twist given by surface 18 being of the same direction as those given by

surfaces

20 and 21.

FIG. 6 shows a path with contact of the thread on four friction surfaces, the twists given by

surfaces

18, 19, 20 and 21 being of like direction.

FIG. 7 shows a path with contact of the thread on three

friction surfaces

21, 20 and 18, the twists given by

surfaces

20, 21 being of opposite direction with respect to that given by surface 18.

As can be seen, the defice of the present invention allows treating a thread in many different ways which allow obtaining threads having different aspects and EXAMPLE I In this example, illustrated by FIG. 4, a thread of polyhexamethylene adipamide 22 dtex/3 strands is subjected to the action of two

friction surfaces

21 and 20, the path of the thread being determined by the guiding

elements

22 and 23.

The conditions of treatment are as follows:

Hardness of the friction surfaces shore Oven temperature 215 C Thread speed 300 m/min Driving speed of tube 9 33,800 R.P.M.

The thread obtained is puffed and has an elasticity of 250 percent.

EXAMPLE 2 The previous example is repeated, but with the thread following the path illustrated by FIG. 5, the thread being in contact with the three

friction elements

18, 20 and 21, and the path of the thread being determined by guiding

elements

22, 25 and 28. The thread obtained has an elasticity of 321 percent.

EXAMPLE 3 In this example, illustrated by FIG. 7, a thread of polyhexamethylene adipamide 22 dtex/7 strands is subjected to the action of the three

friction surfaces

21, 20 and 18.

The conditions of treatment are as follows:

Hardness of the friction surfaces 70 shore Oven temperature 2l5 C Thread speed 180 m/min Driving speed of tube 9 33,800 R.P.M.

In this case the twist communicated by surface 18 is opposite in direction to that communicated by

surfaces

20 and 21 and the thread has an elasticity of 256 percent, reduced with respect to example 2, in which the three friction surfaces give the thread twists of like direction.

It must be noted that this lower elasticity is obtained despite a slower passage (I m/min instead of 300 m/min) of the thread in the treatment device.

The examples given above illustrate various possibilities of use of false twist by friction of the device according to the invention, but it is evident that this device can be used to perform classical false twist, the thread then passing in the spindle 8.

That which is claimed is:

1. A device for false twist texturing thread of thermoplastic material comprising at least one false twist tube having a cross-pin, a pair of rotatable cylinder means having spaced parallel central axes, magnetic means mounting said false twist tube for rotation in tangential contact with said pair of cylinder means, at least one of said cylinder means having a central longitudinal conduit for the passage of a thread, friction means positioned in said longitudinal conduit for peripheral en gagement of a thread passing therethrough to impart twist thereto, and thread guide means positioned upstream and downstream of said cylinder means for directing thread in a selected path to and from said false twist tube and said rotatable cylinder means.

2. A device as defined in claim 1 wherein each of said pair of cylinder means has a conduit for the passage of thread therethrough, and said friction means comprises friction surfaces positioned at extremities of each of said conduits for engaging the thread.

3. A device as defined in claim 1 wherein said thread guide means have a circular, thread-engaging surface with a diameter greater than about 8mm.

4. A device as defined in claim 1 wherein said thread guide means comprise at least two thread return guides, one of said thread return guides positioned upstream and at least one other of said return guides positioned downstream of the cylinder means.

5. A device as defined in claim 4 wherein each of said thread return guides is off-center with respect to at least one of the axes of the thread conduits of said cylinder means.

6. A device as defined in claim 4 wherein all of said thread guide means are positioned off-center with respect to the axes of said conduits of said cylinder means.

7. Apparatus for false twisting a running yarn strand comprising a pair of rotatable cylinder means, at least one of said cylinder means having an axially positioned thread passageway therethrough and friction means positioned in said passageway for engaging a strand passing therethrough to impart twist thereto during rotation of said cylinder means, spindle means including a tube having a cross-pin therein for engaging a strand passing through said tube to twist the strand during rotation of said tube, means rotatably mounting said spindle means in peripheral engagement with said cylinder means whereby rotation of said cylinder means imparts rotation to said spindle means, and strand guide means positioned adjacent said cylinder means and spindle means for directing a strand in selected paths through said cylinder means and/or spindle means.

8. Apparatus as defined in claim 7 wherein the other of said cylinder means includes an axially positioned passageway for a strand therethrough, and friction means for engaging and twisting a strand positioned in said passageway during rotation of said cylinder means.

9. Apparatus as defined in claim 7 wherein said cylinder means includes a pair of hollow cylinders positioned with their central axes in parallel spaced relation, and means extending radially outwardly from the surface of each of said cylinders and engaging said spindle means to supportably position it for rotation therewith, the central axis of said tube of said spindle means being generally parallel to the central axes of said cylinders, and means for driving one of said cylinders to impart rotation to said tube and other cylinder.

Claims

1. A device for false twist texturing thread of thermoplastic material comprising at least one false twist tube having a crosspin, a pair of rotatable cylinder means having spaced parallel central axes, magnetic means mounting said false twist tube for rotation in tangential contact with said pair of cylinder means, at least one of said cylinder means having a central longitudinal conduit for the passage of a thread, friction means positioned in said longitudinal conduit for peripheral engagement of a thread passing therethrough to impart twist thereto, and thread guide means positioned upstream and downstream of said cylinder means for directing thread in a selected path to and from said false twist tube and said rotatable cylinder means.