Method for starting a spindle of a cabling or two-for-one twisting machine

Abstract

A method for starting a spindle of a cabling or two-for-one twisting machine, wherein a yarn reserve is formed on a take-up package, the machine has a workstation having a spindle pot for holding a first feed package and having a spindle rotor with a lateral outlet below the spindle pot, an outer yarn from one feed package is wound around an inner yarn from another feed package and the outer yarn is guided through the spindle shaft and its lateral outlet in a balloon orbiting the spindle pot to a yarn-guiding device above the spindle which merges the two yarn supplies, and a winding device in which the produced twist is wound onto the take-up package. A ratio of the take-up speed of the twist to the rotation speed of the spindle rotor is increased in comparison with the production data is used during creation of the yarn reserve.

Claims

1. A method for starting a spindle of a cabling or two-for-one twisting machine at the start of a spindle journey, wherein the cabling or two-for-one twisting machine has at least one workstation, each workstation having a spindle pot at rest during the twisting for holding a first feed package and having a rotating, hollow spindle rotor with a spindle hollow shaft, which has a lateral outlet opening arranged below the spindle pot at a distance from the spindle hollow shaft, wherein an outer yarn pulled from a second feed package is wound around an inner yarn pulled from the first feed package and wherein the outer yarn is guided through the spindle hollow shaft and through the lateral outlet opening thereof and in a yarn balloon orbiting the spindle pot to a yarn-guiding device, which is arranged above the spindle in extension of a spindle axis and which merges two yarn supplies, and a winding device is present, in which the winding device creates a produced twist that is wound onto a take-up package, characterized in that the method comprising: creating a yarn reserve on an empty take-up package by using a start-up ratio of a take-up speed of the produced twist to an actual rotation speed of the spindle rotor during start-up conditions, the start-up ratio being greater than a production ratio of a take-up speed of the produced twist to an actual rotation speed of the spindle rotor during production conditions.

2. The method according to claim 1, characterized in that the take-up speed is increased during the creation of the yarn reserve in comparison with the take-up speed during production.

3. The method according to claim 1, characterized in that a run-up of the spindle rotor occurs with at least an acceleration increased by a factor of 1.2 during creation of the yarn reserve.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in greater detail below on the basis of an embodiment example, with reference to the accompanying drawings, wherein:

(2) FIG. 1 depicts a schematically presented workstation of a cabling machine;

(3) FIG. 2 is a graph of the twists in dependence on the take-up speed of the twist;

(4) FIG. 3 is a graph of the run-up ramp of the spindle rotor in dependence on the acceleration;

(5) FIG. 4 is a graph of the twists during the creation of the yarn reserve.

DETAILED DESCRIPTION OF THE INVENTION

(6) In FIG. 1, a schematic view of the structure of a workstation of a cabling machine is shown. The cabling spindle 2 is supported on a spindle rail 3. A first feed package 4 is in the spindle pot 5 of the cabling spindle 2. Overhead, the inner yarn 6 is pulled from the first feed package 4 and led through a yarn brake 7 arranged in the cabling hood 1. After the yarn brake 7, the inner yarn 6 exits the cabling hood 1 through a yarn guide eye 8 and finally passes through a downstream yarn-guiding device, here a balloon yarn guide eye 9. The balloon yarn guide eye 9 is fastened by means of a retainer 10 to the machine frame, which is only intimated. Instead of the balloon yarn guide eye 9, a so-called cord regulator, for example, can also be present.

(7) A second feed package 11 is typically supported on a slide-on device arranged on the machine frame and is shown adjacent to the cabling spindle 2 only schematically here. The outer yarn 12 pulled from the second feed package 11 passes through the spindle hollow shaft 13 from below, is deflected in the radial direction and exits radially at the yarn storage disc 14. The yarn storage disc 14 is rotationally driven by a drive belt 16 by means of a spindle whorl 15.

(8) Exiting from the yarn storage disc 14 and forming a yarn balloon B, the outer yarn 12 is led on the outside of the spindle pot 5 upward to the balloon yarn guide eye 9. Here, the outer yarn 12 is wrapped around the inner yarn 6 and the twist 18 produced in this way is wound further onto a take-up package 19. That is, the point of cabling, at which the inner yarn 6 and the outer yarn 12 merge and form the yarn or cord yarn 18, is located in the balloon yarn guide eye 9 or the balancing system.

(9) A pull-off device 20 is arranged above the point of cabling, by means of which the twist 18 is pulled off and fed via a balancing element, such as a dancer 21, to a winding device 22. The winding device 22 has a drive roller 23 and a take-up package 19 frictionally driven by the drive roller 23.

(10) FIG. 2 shows the ratio of the actual spindle rotational speed to the production spindle rotational speed and the ratio of the actual take-up speed to the production take-up speed during the start of a spindle 2. While the ordinate scales the ratio, the abscissa is a time axis. The first time span shows the curve during the creation of the yarn reserve, which is followed by the time span of the production. Both the spindle rotational speed and the take-up speed reach a constant value.

(11) Reference sign 26 indicates the ratio of the actual spindle rotational speed to the production spindle rotational speed. The spindle 2 accelerates to the production rotational speed over a certain time period and then remains constant; that corresponds to a ratio of 1. Reference sign 27 indicates the ratio of the actual take-up speed to the production take-up speed. The take-up speed increases and reaches a value that lies above the production take-up speed. In this example, the value corresponds to a ratio of approximately 1.5. During this increased actual take-up speed, the yarn reserve is wound. After a specified time, the actual take-up speed is lowered to the production take-up speed and the yarn guide pivots with the twist 18 into the production region in order to wind the twist 18 under production conditions.

(12) FIG. 3 graphically presents the run-up ramp of the spindle rotor. The spindle frequency is shown on the ordinate. The abscissa scales the time in seconds. Reference number 24 indicates an acceleration that was previously performed during the start of a cabling spindle 2 at the start of a batch or after a restart, for example after a yarn break. The spindle rotor requires approximately 11.7 seconds to reach the operating rotational speed.

(13) In contrast, reference sign 25 indicates an acceleration of the spindle rotor at the start of a new batch that, in this example, occurs 2 Hz*s−1 faster than the previous acceleration. As a result, the spindle rotor has run up to the operating rotational speed already after approximately 8.7 seconds and therefore approximately 3 seconds faster. The faster the spindle rotor is accelerated to the operating rotational speed, the faster the outer yarn 12 forms the yarn balloon B and the less long the outer yarn 12 rubs on the lower and/or upper edge of the spindle pot 5.

(14) FIG. 4 shows the creation of an approximately 5 metre long yarn reserve, before the twist 18 is produced and wound under production conditions. At the start of the winding operation, the number of twists rises to approximately 80 T*m.sup.−1, and the twist 18 is wound at a high take-up speed. After approximately 4 metres, the take-up speed drops and the twists increase to a specified value of 280 T*m.sup.−1. After the specified twist and therefore the production speed have been reached, the yarn guide pivots with the twist 18 to be wound into the production region of the take-up package 19 and winds the twist 18 under production conditions.

(15) It will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of a broad utility and application. Many embodiments and adaptations of the present invention other than those herein described, as well as many variations, modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and the foregoing description thereof, without departing from the substance or scope of the present invention. Accordingly, while the present invention has been described herein in detail in relation to its preferred embodiment, it is to be understood that this disclosure is only illustrative and exemplary of the present invention and is made merely for purposes of providing a full and enabling disclosure of the invention. The foregoing disclosure is not intended or to be construed to limit the present invention or otherwise to exclude any such other embodiment, adaptations, variations, modifications and equivalent arrangements, the present invention being limited only by the claims appended hereto and the equivalents thereof.