EP0069786B1 - Method of manufacturing yarns having, in longitudinal sections, varying appearances in colour and/or structure or the like, and device for carrying out the method - Google Patents

Description

The invention relates to a process for the production of yarns with a length-wise change in color and / or structure or the like.A changing appearance from a fiber web having different colors and / or structures, which is provided on the roller jacket of a rotating customer with holding elements, in particular a tick set Form of several, in particular close to each other, different in color, structure or the like.Floor ribbons are transferred and divided and removed at a point offset in the circumferential direction with respect to the transfer point in pile ribbons with a length-wise changing appearance, whereby the wedge ribbons changing appearance It is conferred that a relative transverse movement between the fiber web on the roller jacket of the customer and the fiber or web belts is either at least by the amount of when the tapes are transferred to or removed from the roller jacket neighboring bands takes place.

In a known device operating according to this method (DE-AS 2 515 585), the transverse movement takes place continuously. Either the transverse movement has a zigzag or wavy course, based on the fiber web or the fiber tapes supplied. The length of the length sections with changing appearance and the transition areas from one appearance to the other appearance can be influenced by adjusting the angle of inclination of the zigzag or wavy movement or by continuously changing this angle of inclination. The amplitude of the zigzag or wave-shaped movement should be greater than the sum of the width of different, adjacent pile ribbons.

With the known method, short transition areas and long sections with clear colors or structures cannot be achieved. If the angle of inclination of the transverse movement is steep, then the sections of certain colors are also short; if the angle of inclination is flat, long transitions with mixed color result. Another disadvantage is that the proportion of the individual colors is different in the yarns produced next to one another by this method.

The invention has for its object to provide a method and an apparatus which enable the production of yarns with short transitions between the lengths of different structure or different color and with clear colors within the short or long chosen lengths.

This object is achieved with a method of the type mentioned in that the transverse movement takes place suddenly and its amplitude is exactly one or more times the lateral displacement of the pile ribbons and that after a transverse movement in one and / or other direction the further transmission or Removal of the cardboard ribbons for a certain length of the cardboard ribbons takes place without transverse movement.

In contrast to the known method, there is no uninterrupted transverse movement, but a transverse movement with interruptions. Since the transverse movement takes place in leaps and bounds, the transitions between the individual sections are sharply separated from one another. The time set for the jump is decisive for the sharpness of the separation. Since the jump corresponds exactly to the multiple of the lateral offset of the pile ribbons and after this jump there is no further lateral movement until the next jump, a high color purity is guaranteed.

With the method according to the invention it is possible to produce different types of yarn. If there is a jump in the opposite direction immediately after the jump and for the same amount, then you get so-called "flame yarn". However, if there is a pause between the first jump and the second jump, then sections of the same or different lengths with different colors or structures are lined up, depending on how long the pauses in the transverse movement between the jumps are selected. In order to obtain the same color distribution or structure distribution in all of the yarns produced next to one another, a program for the jumps and pauses is selected in which the sum of the similar length sections of each removed pile is the same over a predefinable pile length (repeat). This can be achieved both with sections of the same length and with sections of different lengths. In the case of sections of different lengths, it is also ensured that there are no images of a fabric made from this yarn.

A device suitable for carrying out the method consists of a band storage device holding a plurality of fiber slivers in color and / or structure or the like, a parallel feed, with which fiber slivers can be transferred from the band storage device onto the jacket of a rotating customer equipped with holding elements, in particular a tick set , and a pile divider arranged downstream of the customer, with which the pile on the jacket can be divided into strips and removed, the drum on the one hand or the parallel feed or the pile divider on the other hand being able to be moved back and forth in the transverse direction relative to one another by means of a drive. At a Such a device, the invention is that the amplitude of the transverse movement is exactly one or more times the lateral displacement of adjacent pile ribbons and the drive can be quickly switched from one rest position to another rest position in the manner of a switching mechanism, at least two rest positions being provided and the Lengths of the breaks in the individual rest positions are adjustable. A stepping motor can be provided for the drive, or a cylinder piston drive that can be adjusted in stages. There are various options for controlling the drive: B. a cam or link control, a punched tape or magnetic tape control.

• Figur 1 eine Vorrichtung zum Herstellen von Florbändern als Vorgarne in schematischer Darstellung in Seitenansicht und
• Figuren 2-4 mehrere nebeneinander geführte Florbänder mit längenabschnittweise wechselndem Erscheinungsbild, jeweils in einer Rapportlänge.

The invention is explained in more detail below with the aid of a drawing representing an exemplary embodiment. Show in detail

• Figure 1 shows a device for producing card webs as rovings in a schematic representation in side view
• Figures 2-4 a number of cardboard ribbons, which are guided next to each other and have a changing appearance, each in a repeat length.

Fiber slivers 3, 4 are removed from cans 1, 2 of a ribbon storage device and fed via a parallel guide close to one another to a pair of feed rollers 6, 7 which are equipped with a conventional tick set. The pull-in roller pair 6, 7 is followed by a tear roller 8 also equipped with a tick set, which together with the feed roller pair 6, 7 forms the tape feed. The fiber slivers are transferred from the tear roller 8 to a drum 9. The guide 5, the pair of feed rollers 6, 7, the tearing roller 8 and the drum 9 are built on a common carriage or carriage 10 which is transverse to the conveying direction of the slivers 3, 4 coming from the belt store 1, 2 and parallel to the axes of the rollers 6 , 7, 8 and the drum 9 can be moved back and forth by a drive 11.

Downstream of the drum 9 is a take-up device (drum) 12 with a much larger diameter than the drum 9, the jacket of which is also equipped with a tick set. The strip-shaped fibrous web is transferred from the jacket of the drum 9 to the jacket of the customer 12 in a manner to be described. The fiber web is removed from the jacket of the customer 12 by means of a chopper 13 and fed to a pile divider 14, which divides the processed fiber web, which is still flat at the entrance, into webs 15, 16, 17, 18. From the pile divider 14, the fiber tapes reach Nitschlern 19, 20, 21, 22 and then as drawn and taped fiber tapes (rovings) to winding devices 23, 24, 25, 26 of a winding apparatus.

In order to obtain cardboard ribbons 15 to 18 with a changing appearance in the winding apparatus 23 to 26, the carriage 10 with the parts 5 to 9 built thereon can be moved in a special way by means of the drive 11 relative to the axially immovable customer 12. A stepper motor can be provided as the drive, which acts on the carriage 10 via a spindle in such a way that the carriage 10 is adjusted by paths which correspond exactly to the single or multiple the width of fiber slivers 3, 4 which are guided next to one another. A pause of any length can be activated after a lateral movement. Instead of a stepping motor, a cylinder-piston arrangement with a stroke corresponding to one or more times the displacement of fiber slivers 3, 4 guided alongside one another can also be used.

It goes without saying that the color purity in the individual length sections of the removed pile ribbons (upstream) 15 to 18 is only guaranteed if the pile ribbons by the customer 12 each only from one track determined by a pile ribbon and not from two adjacent tracks by the chipper 13 removed and divided in the pile divider 14.

The type of transverse movement can best be explained with reference to FIGS. 2 to 4. In any case, at least two types of fiber ribbons 3, 4, which differ in color and / or structure, are taken from the ribbon store 1, 2. A large number of these slivers are guided close to one another and pass through the guide 5 to the feed roller pair 6, 7. In the three examples of FIGS. 2 to 4, a repeat length is shown for a narrow section of the strip-shaped pile as it is on the roller shell of the customer 12 appears.

In the exemplary embodiment in FIG. 2, the band store 1, 2 contains three different types of fiber bands. The width of the slivers 3, 4 worked up in the tearing roller 8 and the drum is identical to one another. The drive 11 is set to a jump width, which is equal to the simple width of a card web, so that the first card web comes to rest on the jacket of the customer 12 in the track of the second card web during a jump. With the next jump, the first pile comes in the track of the third pile and with the third jump comes back in the original track. As can be seen from the drawing, the transition from one track to another track is very short. Since the amplitude of the jump corresponds to the grid of the pile ribbons, a high color purity or structural purity is guaranteed within a new pile ribbon with a length-wise changing appearance. As can also be seen in FIG. 2, there are pauses of equal length between the individual jumps, so that. a distribution of the different types of one third results for three different types of pile ribbons within a repeat length.

The embodiment of FIG. 3 differs from that of FIG. 2 only in that the pauses between the jumps differ are long. But here too it is guaranteed that the distribution of the different types is one third for each band within a repeat.

The embodiment of FIG. 4 differs from the two previous embodiments in that only two types of slivers are used and the pause between two jumps is very short to zero, with a jump in one direction being followed by a jump back. With such a control of the transverse movement, a so-called flame yarn is obtained.

• Bändergeschwindigkeit etwa 30 cm/sec, Zeit für Querbewegung etwa 0,15 sec und Pausenzeit 0,3 bis 1,8 sec.

The following values should be suitable for the practical application of the method according to the invention:

• Belt speed about 30 cm / sec, time for transverse movement about 0.15 sec and pause time 0.3 to 1.8 sec.

Claims (6)

1. Method of producing rovings with an appearance varying in colour and/or structure or the like from one longitudinal section to the other, from a fibre web which has various colours and/or structures and which is transferred on to the shell of a rotating pick-up drum fitted with holding elements, especially an array of small hooks, in the form of a plurality of web bands which are guided especially closely adjacent one another and which differ from one another in coulour, structure or the like, and, at a place offset in the peripheral direction relatively to the transfer place, is divided and taken of in web bands with an appearance varying from one longitudinal section to another, and the sectionwise varying appearance is imparted to the web bands by providing a relative transverse movement between the web on the drum shell and the web bands either at the transfer of the web bands to or the taking-off of the web bands from the drum shell at least by the amount of the lateral offset of neighbouring web bands, characterised in that the transverse movement is effected suddenly, and its amplitude amounts exactly to the amount of or a multiple of the lateral offset of web bands guided adjacent one another, and that after a transverse movement in the one and/or other direction the further transfer or take-off of the web bands is effected without transverse movement for a specific section length of the web bands.

2. Method according to claim 1, characterised in that the sums of the similar length sections of each taken-off web band over a predeterminable web band length (repeat) are identical.

3. Method according to claim 1 or 2, characterised in that the length sections with varying appearance of each taken-off web band vary in length irregularly.

4. Apparatus for carrying out the method according to claim 1, comprising a storage system accommodating a plurality of sliver elements differing in coulour and/or structure or the like, a parallel feed arrangement with which sliver elements are transferrable from the storage system on to the shell of a rotating pick-up drum fitted with retaining or holding elements especially an array of small hooks, and a web divider which is situated downstream of the pick-up drum and with which the web can be divided into bands on the drum shell and taken off, and the pick-up drum on the one hand or the parallel feed arrangement or the web divider on the other hand are movable to and fro in the transverse direction relatively to one another by means of a drive, characterised in that the amplitude of the transverse movement amounts exactly to the amount of or a multiple of the lateral offset of neighbouring bands, and the drive (11) is changeable rapidly from one rest position to another rest position in the manner of a switching mechanism, at least two rest positions being provided, and the lengths of the pauses in the individual rest positions being adjustable.

5. Apparatus according to claim 4, characterised in that the drive (11) comprises a stepping motor.

6. Apparatus according to claim 4, characterised in that the drive (11) is a piston-and-cylinder arrangement which is adjustable stepwise.

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