GB2123042A - Apparatus for producing a fancy yarn - Google Patents
Apparatus for producing a fancy yarn Download PDFInfo
- Publication number
- GB2123042A GB2123042A GB08317820A GB8317820A GB2123042A GB 2123042 A GB2123042 A GB 2123042A GB 08317820 A GB08317820 A GB 08317820A GB 8317820 A GB8317820 A GB 8317820A GB 2123042 A GB2123042 A GB 2123042A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thread
- pair
- winding body
- feed rollers
- foundation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
- D02G3/343—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns using hollow spindles
Abstract
A rotatable hollow spindle 3 carries a binding thread bobbin 4 and, at its exit end, a false-twist element 6. A first pair of feed rollers 1 for a foundation thread G and a second pair of feed rollers 2 for an effect thread E delivered at a higher speed than the foundation thread G are arranged upstream of the bobbin 4. A pair of draw-off rollers 7 draw off the finished fancy yarn F. A separate variable driving motor 10 drives the second pair of feed rollers 2. A central driving motor 8 drives the pair of draw-off rollers 7 and, via an infinitely variable speed transmission 9, the first pair of feed rollers 1. A winding body 11 whose axis of rotation A is arranged coaxially with the axis of the hollow spindle and which can be driven by the driving motor 10 via a variable speed transmission 12 is hollow for the passage of the foundation thread G. The effect thread E is delivered tangentially to the winding surface 11% of the winding body 11 substantially perpendicularly to the axis of rotation A of the said body by way of a thread guide 13. <IMAGE>
Description
SPECIFICATION
Apparatus for producing a fancy yarn
The present invention relates to an apparatus for producing a fancy yarn having a rotatable hollow spindle carring a binding thread bobbin and at its exit end, if necessary, a false-twist element and with which a first pair of feed rollers for at least one foundation thread and a second pair of feed rollers for an effect thread delivered at a higher speed than the foundation thread are associated at its entry end, furthermore having a pair of draw-off rollers arranged after the falsetwist element, by which pair of rollers the finished fancy yarn is drawn off at a lower speed than the delivery speed of the effect thread, and having a separate variable driving motor for the second pair of feed rollers and preferably a central driving motor by which the pair of draw-off rollers and the first pair of feed rollers can be driven, the latter variably in speed compared with the former via an infinitely variable speed transmission.
In a known apparatus of this kind, the effect thread is delivered to the foundation thread at a speed higher than its own and in fact between the second pair of feed rollers and the hollow spindle.
The delivery at higher speed is also referred to as over-feeding. By means of the over-feeding, specific recurring effects, such as, for example, loops, knops or beads, are intended to be achieved. These effects are then fixed or set by the binding thread or binder delivered at the falsetwist element, which thread winds around the effect thread and the foundation thread. With an apparatus of this kind, fancy yarns can be produced substantially faster and more rationally than on conventional ring twisting frames. Effect formation in the case of false-twist hollow spindle machines is, however, very greatly dependent on the stiffness of the fancy yarn. The stiffer this is, the more poorly can it be bound or tied in and too large loops at too large intervals often occur. The formation of the effect can be monitored and/or controlled only with difficulty.
Therefore, the problem underlying the invention is to provide an apparatus for producing a fancy yarn having a rotatable hollow spindle of the kind mentioned at the beginning carrying a binding thread bobbin and at its exit end a false-twist element wherein the formation of the effect is better controllable and thereby a still larger number of effects can be produced, also from difficult yarns.
According to the invention, this problem is solved in that between the entry end of the hollow spindle and the two pairs of feed rollers there is rotatably mounted a winding body whose axis of rotation is arranged coaxially with the axis of the hollow spindle and which can be driven in dependence upon the speed of rotation of the second pair of feed rollers (initial pair of rollers) by the driving motor thereof via a variable speed transmission, that in order to pass the foundation thread through it the winding body is of hollow form, and that the effect thread is delivered tangentially to the winding surface of the winding body by way of a thread guide substantially perpendicularly to the axis of rotation of the said body.
In the novel apparatus, the effect thread delivered at higher speed than the foundation thread is wound on the winding surface of the winding body. The overfed effect thread is therefore stored in a controlled manner on the winding body. The foundation thread running through the winding body exerts a certain tensiie stress on the effect thread. As soon as the tensile stress becomes too great, the foundation thread pulls off the yarn store or supply of effect thread wound on the winding body. Depending on the stiffness and nature of the effect thread being worked up and also depending on the extent of the over-feeding and the form of the winding body, loops, knops, beads or the like of different sizes are formed in this way. The storage process is constantly repeated.Since the effect thread is wound on the winding body in a controlled manner, the effects created always have approximately the same size and shape for a certain setting of the machine. An important prerequisite for this is that the winding body is driven in dependence upon the second pair of feed rollers which delivers the effect thread and that the speed of rotation of the winding body is adjustable via the variable speed transmission.
The variable speed transmission may be in the form of a changeable step gearing or better still of an infinitely variable speed transmission. Due to the variability of the speed of rotation of the winding body with respect to the second pair of feed rollers, the thread tension between the winding body and the second pair of feed rollers can be adjusted accurately and thereby the formation of the effects can also be affected and controlled.A particularly advantageous development of the invention consists in that the winding body has a driving pulley with a central bore for the passage of the foundation thread and that at that end face of the pulley which is turned towards the hollow spindle there are arranged as the winding surface at equal angular distances at least two spring steel wires which, starting from their ends connected over a larger diameter to the pulley, extend obliquely towards the axis of rotation of the winding body and then extend towards their free ends at a radial distance from the axis of rotation substantially parallel thereto or obliquely outwards. These portions of the spring steel wires which extend parallel or obliquely outwards form the actual winding surface.Due to the elasticity of the spring steel wires, the wound-on yarn supply is securely held in the desired manner until the tension of the foundation thread exceeds a certain value. Because of this, with elastic compression ot the free ends of the spring steel wires, the wourd- on yarn supply is drawn off them. A particularly uniform effect formation is thereby achieved. It is also important, however, that owing to the elasticity of the spring steel wires the wound-on yarn supply is always held securely on the winding body when the machine is at a standstill or in the case of low working speed of the machine, as occurs on starting or stopping thereof. As a result of this, on starting and stopping of the machine, the same effects are formed as at full operating speed of the same.Since the wound-on yarn supply cannot drop off the winding body even when the machine is at a standstill, irregularities or unevenness in the effect formatibn and faults in the fancy yarn are substantially excluded.
Additional advantageous developments of the invention are characterised in the sub-claims.
The invention is described in detail hereinafter with reference to several embodiments shown in the drawing. In the drawing:
Figure 1 is a diagrammatic representation of the whole apparatus for producing a fancy yarn;
Figure 2 shows a first embodiment of a winding body out of operation;
Figure 3 shows the same embodiment during operation;
Figure 4 shows a second embodiment out of operation;
Figure 5 shows this embodiment during operation;
Figure 6 shows a third embodiment out of operation;
Figure 7 shows this embodiment during operation;
Figure 8 shows a fourth embodiment during operation.
The foundation thread G is delivered by way of a first pair of feed rollers 1. A second pair of feed rollers 2 serves to deliver the effect thead E.
Should the feed system for the effect thread E comprise several feed rollers, the initial pair of rollers is understood as the second pair of feed rollers. A hollow spindle 3, which carries a binding thread or binder bobbin 4, is driven by the belt 5 via a separate driving motor (not shown). At the exit end of the hollow spindle 3 there is provided a false-twist element 6 around which the foundation thread G, the effect thread E and the binding thread B are twined. The fancy yarn formed is fixed at the false-twist element 6 by the binding thread
B. A pair of draw-off rollers 7 is provided for drawing off the finished fancy yarn F.
A central driving motor 8 serves to drive the pair of draw-off rollers 7. This motor is also connected to the pair of feed rollers 1 via an infinitely variable speed transmission 9. The delivery speed of the first pair of feed rollers 1 can be so adjusted by means of the variable speed transmission 9 that it is up to 20% different from the draw-off speed of the pair of draw-off rollers 7.
A separate variable driving motor 10 serves to drive the second pair of feed rollers.
According to the invention, a winding body 11 is now rotatably mounted between the energy end of the hollow spindle 3 and the two pairs of feed rollers 1, 2. The axis of rotation of this winding body 11 is arranged coaxially with the axis of the hollow spindle 3. The winding body 11 is likewise driven by the driving motor 10 of the second pair of feed rollers and in fact via a variable speed transmission 12. This variable speed transmission may be in the form of a change-over gear or better of an infinitely variable gear. The winding body 11 is of hollow form, so that the foundation thread G can be passed through it. The effect thread E is delivered tangentially to the winding body 11 by way of a thread guide 13 substantially perpendicularly to the axis of rotation of the winding body.
In order to aid the drawing-off of the fancy-yarn supply formed on the winding body at any given time, the winding surface 11' of the sinding body is suitably so designed that it tapers towards the hollow spindle 3.
The apparatus operates in the following manner.
The foundation thread G is delivered by the first pair of feed rollers 1, that runs through the winding body 11 and then through the hollow spindle 3. A predetermined tension is imparted to the foundation thread G by the pair of draw-off rolls 7, which runs at a somewhat higher speed than the pair of feed rollers 1.
The effect thread E is delivered by the second pair of feed rollers at a higher speed than the foundation thread G. Owing to this, an overfeeding of thread occurs. The effect thread E is delivered to the winding surface 11' of the winding body 11 by way of the thread guide 13. In this process, the surplus amount of thread supplied is wound on the winding surface 1 1'.
Since the preceding portion of the effect thread is united with the foundation thread and the foundation thread constantly moves on, the tension between the yarn supply of effect thread wound on the winding body 11 and that part of the effect thread which is united with the foundation thread increases. When the thread tension exceeds a certain value, the wound-on yarn supply is drawn off over the free end of the winding body 11 facing the hollow spindle 3 and then winds around the foundation thread G. Depending on the nature of the yarn, its stiffness and the adjustment of the relative speed of the various feed rollers as well as the speed between the pair of feed rollers 2 and the winding body 11 and, moreover, in dependence upon the special conformation of the winding body 11, specific effects are formed.
Since the process of winding of the effect thread on the winding body 11 and of drawing-off of the yarn supply formed is constantly repeated, a fancy yarn with uniformly recurring effects is produced.
This fancy yarn runs through the hollow spindle 3, at the end of which the twist imparting element 6 is provided. In the region of the twist imparting element 6, the binding thread B is twined around the effect thread wound around the foundation thread and the latter and the effects are thereby fixed. The finished fancy yarn F is drawn off by the draw-off rollers 7 and wound on a bobbin (not shown). By adjusting the relative speed between the second pair of feed rollers 2 and the winding body 11, the tension of the effect thread E can be varied in the region between the pair of feed rollers 2 and the winding body 11 and the effect formation can thereby also be affected additionally.
Depending on the nature of the material to be processed and on the kind of effect to be produced, it may be necessary to design the winding body 11 in a special manner. In this connection, winding bodies whose winding surface consists of spring steel wire and which are described hereinafter in detail with reference to
Figures 2 to 7 have proved to be particularly advantageous.
In the embodiments shown in Figures 2 to 7, the winding body 11 a, 11 b, 1 C consists in each case of a driving pulley 14 with a central bore 1 5 for the passage of the foundation thread G. At that end face 1 4a of the pulley 14 which is turned towards the hollow spindle, a plurality of spring steel wires 1 6a, 1 sub, 1 sic are arranged at equal angular distances W and W1, respectively, as the winding surface, When three spring steel wires 1 6a, 1 6b are provided, this angular distance W is 1200, as is shown in Figures 2 to 5, and when two spring steel wires 1 sic are provided as shown in
Figures 6 and 7, this angle W1 is 1800.
Starting from its end 1 7a, 1 7b, 1 7c connected to the pulley 14 over a larger diameter, each spring steel wire 1 spa, 1 sub, 1 6c has a portion 1 8a, 1 8b, 1 8c extending obliquely towards the axis of rotation A of the winding body 11 a, 1 b, 11 c. This portion 1 8a, 1 8b, 1 8c is followed by another portion 1 9a, 1 9b, 1 9c which, in the case of the embodiments according to Figures 2 and 3 and also 6 and 7, is arranged at a radial distance from the axis of rotation A and substantially parallel thereto.In the case of the embodiment shown in
Figures 4 and 5, the portions 1 9b of the spring steel wires 1 6b extend obliquely outwards with respect to the axis of rotation A to their free ends, but likewise at a distance from the axis of rotation
A.
The diameter of the spring steel wires 1 6a, 1 sub, 1 sic is about 0.3-1.5 mm.
Due to the arrangement of three spring steel wires 1 spa, 1 6b with rotation symmetry, as shown in Figures 2 to 5, axial guiding of the foundation thread G is obtained. The foundation thread G runs through the central bore 1 5 and is then guided by the portions 1 9a and 1 9b, respectively, of the spring steel wires 1 6a, 1 6b. As can be seen from
Figures 3 and 5, the portions 1 9a and 1 9b, respectively, form the actual winding surfaces of the winding body 11 a, 1 b. The obliquely extending portions 1 8a, 1 8b prevent the effect thread E winding itself on the spring steel wires 1 spa, 1 6b over too great a length in the axial direction.
The embodiment according to Figures 2 and-3 is intended for thin materials. Very small loops can be produced therewith. The thickness of the -wire depends on the range'of yarn to be chiefly worked up. Due to the elastic properties of the spring steel wires 1 spa (and also 1 6b and 1 sic), the yarn supply wound on the portions 1 9a (and also 1 9b, 1 9c, respectively) is securely held until the tension produced by the foundation thread pulls this yarn supply off. Even when the winding body is at rest, the elasticity of the spring steel wires ensures that this yarn supply does not drop off the winding body prematurely.
In the embodiment shown in Figures 4 and 5, the portions 1 9b of the spring steel wires 1 sub are bent outwardly towards their free ends. Because of this, the drawing-off of the yarn supply is made more difficult and a larger yarn supply is produced on the winding body 1 b until owing to the tension of the foundation thread the wires are bent together to such an extent that the formed yarn supply of effect thread is drawn off. During the winding operation, however, single loops are already continuously drawn off. With the embodiment of the winding body 11 shown in
Figures 4 and 5 there is produced a fancy yarn with loops and knops or thick parts or slubs.
Since only two spring steel wires 1 Sc are provided in the embodiment shown in Figures 6 and 7, the foundation thread G is not guided by the portions 1 9c of the spring steel wires 19 (sic).
It therefore winds itself first around one of the portions and then around both portions 1 9c. In this way, the foundation thread acquires a false twist with every revolution of the winding body 11 c. At the same time, however, the effect thread
E is also wound on the portions 1 9c. A very close and even loop effect is thereby obtained.
Finally, Figure 8 shows an embodiment of a winding body 11 dwhich likewise has a driving pulley 14 with a central bore 1 5. At that end face 14a of the pulley which is turned towards the hollow spindle 3 there is provided as the winding surface a substantially conical body 20 which has in communication with the central bore 1 5 an inclined bore 21 for the passage of the foundation thread G. The inclined bore 21 opens in the surface of the cone. The foundation thread emerging from the inclined bore 21 runs along the surface of the cone 20 and is wound around with the effect thread E in the process. This kind of winding body 1 d is suitable in particular for yarns of a bulky nature or with protruding individual filaments, as is the case with mohair materials.
Claims (6)
1. Apparatus for producing a fancy yarn having a rotatable hollow spindle carrying a binding thread bobbin, a first pair of feed rollers for at least one foundation thread and a second pair of feed rollers for an effect thread delivered at a higher speed than the foundation thread associated with the hollow spindle at its entry end, a pair of drawoff rollers for drawing off the finished fancy yarn at a lower speed than the delivery speed of the effect thread, a separate variable driving motor for the second pair of feed rollers characterised in that between the entry end of the hollow spindle and the two pairs of feed rollers there is rotatably mounted a winding body whose axis of rotation is arranged coaxially with the axis of the hollow spindle and which can be driven in dependence upon the speed of rotation of the second pair of feed rollers by the driving motor thereof via a variable speed transmission, that in order to pass the foundation thread through it the winding body is of hollow form, and that the effect thread is delivered tangentially to the winding surface of the winding body, substantially perpendicularly to the axis of rotation of the said body.
2. Apparatus according to claim 1, characterised in that the winding surface of the winding body tapers towards the hollow spindle.
3. Apparatus according to claim 1 or 2, characterised in that the winding body has a driving pulley with a central bore for the passage of the foundation thread and at that end face of the pulley which is turned towards the hollow spindle there are arranged at equal angular distances to form the winding surface at least two spring steel wires which, starting from their ends connected to the pulley, extend obliquely towards the axis of rotation of the winding body and then extend towards their free ends at a radial distance from the axis of rotation substantially parallel thereto or obliquely outwards.
4. Apparatus according to claim 3, characterised in that three spring steel wires are arranged at angular distances of 1200 in each case.
5. Apparatus according to claim 3 or 4, characterised in that the diameter of the spring steel wires is between 0.3 and 1.5 cm.
6. Apparatus according to claims 1 and 2, characterised in that the winding body has a driving pulley with a central bore for the passage of the foundation thread and at that end face of the pulley which is turned towards the hollow spindle there is provided as the winding surface a conical body which has in communication with the central bore an inclined bore for the passage of the foundation thread, the inclined bore opening in the surface of the cone.
7, Apparatus according to claim 1, characterised in that the variable speed transmission for the winding body is infinitely adjustable.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3225488A DE3225488C1 (en) | 1982-07-08 | 1982-07-08 | Device for the production of fancy yarn |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8317820D0 GB8317820D0 (en) | 1983-08-03 |
| GB2123042A true GB2123042A (en) | 1984-01-25 |
| GB2123042B GB2123042B (en) | 1986-02-26 |
Family
ID=6167902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08317820A Expired GB2123042B (en) | 1982-07-08 | 1983-06-30 | Apparatus for producing a fancy yarn |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3225488C1 (en) |
| GB (1) | GB2123042B (en) |
| IT (1) | IT1163568B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790083A (en) * | 2015-04-21 | 2015-07-22 | 浙江纺织服装职业技术学院 | Multicolor-section colored yarn forming device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109763221B (en) * | 2019-03-13 | 2023-09-29 | 愉悦家纺有限公司 | Five-channel hollow spindle fancy yarn forming device and method |
| CN109735983B (en) * | 2019-03-13 | 2023-10-13 | 江南大学 | Device and method for forming three-channel alternating drafting, twisting and coating ring spindle fancy yarn |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE525989C (en) * | 1930-03-28 | 1931-05-30 | Herminghaus & Co G M B H | Device for the production of decorative threads |
| FR2131139A5 (en) * | 1971-03-31 | 1972-11-10 | Rochegude Louis | |
| DE3006863C2 (en) * | 1980-02-23 | 1982-10-21 | Saurer-Allma Gmbh, 8960 Kempten | Device for the production of fancy yarn |
| IT1150918B (en) * | 1981-06-30 | 1986-12-17 | Saurer Allma Gmbh | APPARATUS FOR THE PRODUCTION OF AN EFFECT YARN |
-
1982
- 1982-07-08 DE DE3225488A patent/DE3225488C1/en not_active Expired
-
1983
- 1983-06-22 IT IT21733/83A patent/IT1163568B/en active
- 1983-06-30 GB GB08317820A patent/GB2123042B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104790083A (en) * | 2015-04-21 | 2015-07-22 | 浙江纺织服装职业技术学院 | Multicolor-section colored yarn forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3225488C1 (en) | 1984-01-26 |
| IT8321733A0 (en) | 1983-06-22 |
| IT1163568B (en) | 1987-04-08 |
| GB8317820D0 (en) | 1983-08-03 |
| IT8321733A1 (en) | 1984-12-22 |
| GB2123042B (en) | 1986-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |