TW201641762A - Method for detecting and marking faulty portions in rovings for spin-knit machines - Google Patents

Abstract

A method for detecting, marking, recognising and removing faulty portions in a fibre material, in particular in a roving (V) for a spin-knit machine (20), characterised by the steps: a. unwinding a flyer bobbin (1) with the roving (V); b. guiding the roving (V) through a sensor device (4) for detecting faulty portions; c. marking the faulty portions of the roving (V) by a marking device (6); d. winding the marked roving (V) onto a machine bobbin (8); e. fitting the spin-knit machine with at least one machine bobbin (8); f. supplying the roving (V) from the machine bobbin (8) via a marking detection device to a drafting arrangement of the spin-knit machine; g. controlling the spin-knit machine as a function of the signals of the marking detection unit in order to eliminate recognised faulty portions of the roving (V) before reaching the knitting tools.

Description

Method for detecting and marking a flaw in a roving of a rotary knitting machine

The present invention relates to a method for detecting, marking, identifying and removing a crucible portion of a fibrous material, particularly a crucible portion of a roving of a rotary knitting machine.

In the case of a rotary knitting machine, the drawn fibrous material is produced from the roving by a drafting arrangement and supplied to the knitting tool, preferably untwisted. Knitted articles made from this fibrous material are discerned by a particularly soft hand.

Since rovings generally have areas and/or thin areas with thickened portions in the fibrous material and may also be contaminated by dust, it is necessary to inspect such crepe portions of the roving before entering the drafting configuration. These parts are eliminated to ensure the desired quality of the knitted article. A corresponding method is disclosed, for example, in DE 10 2008 008 210 A1.

It is known that the squeak portion of the roving can be inspected by the sensing device. Do not from DE 10 2008 031 130 A1. These sensing devices detect changes in capacitance based on changes in fiber quality in the roving. Since they are placed directly on the rotary knitting machine, these sensing devices also experience changing external influences such as temperature, air humidity or electromagnetic fields, which can distort the measurement results. Therefore, complex measurements (eg, screening or software compensation) are necessary to obtain reliable measurements anyway under all operating conditions.

It is proposed in DE 10 2010 022 339 A1 to remove all the turns from the roving in a rewinding device and thus to give the knitting machine only a flawless material. However, the roving prepared in this manner contains splices, and it also exhibits thickening of the material and causes deterioration in the quality of the knit fabric. In addition, this process is uneconomical because of the high time spent to remove the roving.

Accordingly, it is an object of the present invention to configure the quality control of the roving of a rotary knitting machine to be more economical and reliable than before.

This object is achieved by a method for detecting, marking, identifying and removing the crucible portion of the fibrous material, in particular the crucible portion of the roving of a rotary knitting machine, the method being characterized by the following steps: a. Unwinding the flyer bobbin with roving; b. guiding the roving through the sensing device to detect the 瑕疵 portion; c. marking the 粗 portion of the roving by the marking device; d. winding the marked roving to Mechanical bobbin Bobbin); e. assembling the rotary knitting machine with at least one mechanical bobbin; f. supplying the roving from the mechanical bobbin to the drafting configuration of the rotary knitting machine via the marking detecting device; g. marking the signal of the detecting device The function is to control the rotary knitting machine to eliminate the identified crepe portion of the roving before the roving reaches the knitting tool.

According to the method according to the invention, the inspection of the roving is performed by means of a sensing device external to the rotary knitting machine. The sensing device is therefore no longer subject to the harsh operating conditions of the machine. The roving inspection can be performed on a large number of roving tubes in a protected space. Thus, the invention is not limited to rovings, but generally to fibrous materials. Next, the rotary knitting machine is assembled with a mechanical bobbin having the marked roving. For each drafting configuration on a rotary knitting machine, only one economical, simple constructed marking detection device is needed that identifies the marked portion of the roving and allows the machine to control to allow removal of the marked portion. Therefore, the elimination can be implemented manually or automatically by a rotary knitting machine using a corresponding additional unit (for example, a gripper, etc.). After the removal of the crotch portion, the ends of the innocent roving portion can also be joined together by splicing, and the rotary knitting process can continue.

More advantages are obtained if the roving is guided through the nozzle before reaching the sensing device to remove smaller items of dust and fluff. Therefore, these smaller items of dust are eliminated before these smaller items of dust are detected by the sensing device. As a result, unnecessary marking steps can be avoided, and The quality of the roving can be improved.

Preferably, the ridge portion of the roving is marked by a marking device in a machine readable code. It can be, for example, an encoding similar to a bar code. The 瑕疵 portion can therefore also be marked by color application. Different types of enamel can be attached to features by different colors.

Alternatively or additionally, the niobium portion may be marked by the application of a luminescent material. Here too, the difference in the various types of defects can be made by varying degrees of illumination, for example, thin or thick places in the material.

A variety of different marking possibilities can also be combined. Depending on the type of flaw detected, a different code can then be applied to the roving by means of a marking device.

Correspondingly, the marking detection device can then transmit a signal to the control unit of the rotary knitting machine depending on the type of encoding detected, and thus trigger the respective actions required depending on the type of cymbal.

However, by means of the sensing device, the material and quality characteristics of the roving can also be detected, and the material and quality characteristics of the roving can be applied to the ends of the roving by means of marking means or the roving can be obtained by means of additional coding and marking means. The material and quality characteristics are applied to the mechanical bobbin. Information about the quality of the roving that may differ from each other between the bobbin and the bobbin can be communicated to the knitting machine in this manner.

Furthermore, the invention relates to a device for detecting and marking a weir portion of a roving of a rotary knitting machine for carrying out the method according to the invention, characterized in that the device has a rewinding device with An unwinding device for the roving of the roving bobbin; a sensing device after the unwinding device for detecting the crotch portion in the roving; and a marking device for the roving after the sensing device.

A nozzle can be provided in front of the sensing device, by which the smaller items of dust and fluff can be removed from the roving.

The marking device may preferably be a material application device, in particular a color spraying device, to be able to correspondingly mark the haptic portion of the roving.

Furthermore, it is advantageous if the sensing device and the marking device are connected to an evaluation unit for sensing the signal. The evaluation unit assumes that the control of the marking device is a function of the sensing signal. Therefore, it is possible to mark different types of defects in different ways.

The sensing device preferably can have at least one capacitive, mechanical, and/or optical sensor. In principle, any sensor technology can be used, as long as the enthalpy (eg, thin or thick, and contaminated) occurring in the roving can be detected by this sensor technology.

Furthermore, it is advantageous if the device has means for winding the roving to be tested onto the mechanical bobbin by means of a guiding member of the roving, the guiding member being movable parallel to the direction of the bobbin axis. In this way, the rovings tested and marked can be wound onto the mechanical bobbin in the desired layer sequence. The layer order can be optimized with respect to the needs of the rotary knitting machine. In particular, it ensures that the marked rovings in the machine can be pulled out without considerable tension changes.

Additionally, the device can have an encoding and marking device for the mechanical bobbin that is coupled to the sensing device. Therefore, there is information about the quality of the roving, For example, in the form of a bar code, it can be applied to a mechanical bobbin, which information can be read later at the knitting machine.

Furthermore, the invention relates to a rotary knitting machine for carrying out the method according to the invention, characterized in that the rotary knitting machine comprises at least one knitting tool carrier having a plurality of longitudinally displaceable knitting tools, and at least A knitting system having at least one knitting system having a drafting configuration for stretching the marked roving to form a fibrous material, the marked roving being pulled from the mechanical bobbin, and the marking detecting device being disposed in at least one drafting configuration In front of the marking detection device is connected to the control unit of the rotary knitting machine, and if it finds a corresponding mark in the roving, the knitting process is interrupted by the knitting tool at the transition point of the knitting tool carrier.

The rotary knitting machine may additionally have means for removing the weir portion in the marked roving.

Accordingly, the rotary knitting machine may preferably be a circular knitting machine having a cylinder provided with a marking detecting device at a space in front of the knitting system, the space corresponding to the length of the fiber material for each rotation of the cylinder . In this way, the knitting can always be interrupted at the same circumferential point of the knit fabric and the knitting started again. At this point, the knitting hose can be cut at a later time so that the break point does not cause deterioration in quality in the knitted fabric.

1‧‧‧ roving tube

2‧‧‧Unwinding device

3‧‧‧ nozzle

4‧‧‧Sensing device

5‧‧‧Evaluation unit

6‧‧‧Marking device

7‧‧‧ Vertically movable guiding device

8‧‧‧ mechanical bobbin

9‧‧‧Code and marking device

20‧‧‧Rotary Knitting Machine

21‧‧‧Circle knitting machine

22‧‧‧Syringe

23‧‧‧Knitting tools

24‧‧‧Drawing configuration

25‧‧‧ delivery tube

26‧‧‧Marking detection device

V‧‧‧ roving

Next, the method according to the invention and the device according to the invention are explained in more detail by reference to preferred embodiments of the drawings.

1 is a schematic view of an apparatus for inspecting and marking rovings; and FIG. 2 is a partial schematic view of a rotary knitting machine.

The device 10 according to Fig. 1 is essentially a rewinding device by which the roving V can be pulled out from the roving bobbin 1 by the help of the unwinding device 2 (here a pair of rollers) . Next, the roving V is guided through the suction nozzle 3, and by the suction nozzle 3, the smaller items of dust and fluff can be removed from the roving V. Thereafter, the roving V travels through the sensing device 4, and by means of the sensing device 4, for example, a change in the quality of the roving V can be capacitively detected. Therefore, the thin and thick places in the roving V and the incorporation of foreign particles can be detected. However, the sensing device 4 can also be a pure optical sensing device.

The sensing device 4 is connected to an evaluation unit 5, which partially actuates the marking device 6. Depending on the type of cymbal detected by the sensing device, the marking device applies a corresponding 瑕疵 code to the roving, for example, by spraying or applying a point of color.

The marked roving V is then wound into a regular layer on the mechanical bobbin 8 by means of a vertically movable guiding device 7.

The device 10 also has an encoding and marking device 9 for the mechanical bobbin 8. The encoding and marking device 9 is connected to the sensing device 4 and receives general information about the quality of the roving V from the sensing device. This information can be applied to the mechanical bobbin in coded form by the encoding and marking device 9.

By means of the device 10, a large number of roving tubes 1 can be inspected beforehand outside the rotary knitting machine, and the marked rovings can be wound onto the mechanical bobbin 8. Next, the mechanical bobbin 8 is inserted into the rotary knitting machine 20, which may have, for example, the schematic structure shown in FIG. Thereafter, the rotary knitting machine 20 has a circular knitting machine 21 with a syringe 22 in which a large number of knitting tools 23 are mounted to be longitudinally displaceable. In front of the knitting tool 23, at least one drafting arrangement 24 is provided, by which the roving V to be tested from the mechanical bobbin is stretched to form a fibrous material and supplied to the knitting tool via the conveying pipe 25. .

Between the mechanical bobbin 8 and the drafting arrangement 24, a marking detection device 26 is provided, whereby the marking detection device 26 detects the code applied by the marking device 6 on the roving V. The marking detection device is preferably an optical sensor that is coupled to the control unit of the rotary knitting machine 20. If the flaw in the roving V is detected, then the knitting is interrupted at the knitting tool 23, and the portion of the roving is removed. This can always be done at a specific change point on the syringe. Therefore, all interruptions in the knitting will occur at the same circumferential position of the formed knitted hose. This position can then be used for the purpose of cutting the knitting. This method is described, for example, in DE 10 2008 008 211 A1.

The marker detecting device 26 can be a very simple and robust sensor that operates reliably even under the harsh conditions of use of the rotary knitting machine 20. In contrast, the device 10 with the sensitive sensing device 4 can be placed in a protected space independent of the rotary knitting machine 20.

1‧‧‧ roving tube

2‧‧‧Unwinding device

3‧‧‧ nozzle

4‧‧‧Sensing device

5‧‧‧Evaluation unit

6‧‧‧Marking device

7‧‧‧ Vertically movable guiding device

8‧‧‧ mechanical bobbin

9‧‧‧Code and marking device

V‧‧‧ roving

Claims (17)

A method for detecting, marking, identifying and removing a crucible portion of a fibrous material, particularly a crucible portion of a roving (V) of a rotary knitting machine (20), the method being characterized by the following steps: a. Unwinding the roving bobbin (1) having the roving (V); b. guiding the roving (V) through the sensing device (4) to detect the 瑕疵 portion; c. marking the roving by the marking device (6) The roving portion of (V); d. winding the roving (V) to be wound onto the mechanical bobbin (8); e. assembling the rotary knitting machine (20) with at least one mechanical bobbin (8) ; f. supplying the roving (V) from the mechanical bobbin (8) to a drafting arrangement (24) of the rotary knitting machine (20) via a marking detecting device (26); g. using the marking detecting device The rotary knitting machine (20) is controlled by a function of the signal of (26) to eliminate the identified portion of the roving (V) prior to reaching the knitting tool (23). The method of claim 1, wherein the roving (V) is guided through the nozzle (3) to remove the smaller items of dust and fluff prior to reaching the sensing device (4). The method of claim 1 or 2, wherein the roving (V) is marked by the marking device (6) in a machine readable code The 瑕疵 part of it. The method of claim 3, wherein the 瑕疵 portion is marked by color application. The method of claim 3, wherein the dam portion is marked by application of a luminescent material. The method of claim 3, wherein a different code is applied to the roving (V) by the marking device (6) depending on the type of flaw detected. The method of claim 6, wherein the mark detecting means (26) transmits a signal to a control unit of the rotary knitting machine (20), the signal being based on the type of the detected code. The method of claim 1, wherein the material characteristics and quality characteristics of the roving (V) are detected by the sensing device (4), and the roving is applied by the marking device (5) The end is applied to the mechanical bobbin in the form of a code by means of a coding and marking device (9). A device for detecting and marking a defect portion in a roving (V) of a rotary knitting machine (20) to perform the method of any one of claims 1 to 8, wherein the device has: rerolling a take-up device with an unwinding device (2) for the roving (V) from the roving bobbin (1); a sensing device (4) after the unwinding device (2) for detecting the roving ( a 瑕疵 portion in V); and a marking device (6) for the roving (V) after the sensing device. Such as the device of claim 9 of the patent scope, wherein the nozzle (3) is disposed in front of the sensing device (4). A device according to claim 9 or 10, wherein the marking device (6) is a material application device, in particular a color spraying device. The device of claim 9, wherein the sensing device (4) and the marking device (6) are connected to an evaluation unit (5) for sensing a signal. The device of claim 9, wherein the sensing device (4) has at least one capacitive, mechanical and/or optical sensor. The device of claim 9, wherein the roving (V) for testing the roving (V) to be wound onto the mechanical bobbin (8) by the guiding member (7) of the roving (V) The device, the guiding member (7) is movable parallel to the direction of the bobbin axis. The device of claim 9, wherein the device has a coding and marking device (9) for a mechanical bobbin (8), the coding and marking device (9) being connected to the sensing device (4). A rotary knitting machine for performing the method according to any one of claims 1 to 8, wherein the rotary knitting machine comprises at least one of a longitudinally displaceable knitting tool (23) having a large amount a knitting tool carrier (22), and at least one knitting system having a dispensed drafting arrangement (24) for stretching the marked roving (V) to form a fibrous material, the marked The roving (V) is pulled out from the mechanical bobbin (8), and a marking detecting device (26) is disposed in front of the at least one drafting arrangement (24), the marking detecting device being coupled to the rotary knitting machine ( 20) control unit, and if it finds the roving (V) The marking of the middle portion of the knitting tool triggers the interruption of the knitting process by the knitting tool (23) at the transition point of the knitting tool carrier (22). A rotary knitting machine according to claim 16, wherein the rotary knitting machine is a circular knitting machine (21), and a syringe (22) and the marking detecting device (26) are provided at a space in front of the knitting system. This space corresponds to the length of the fibrous material for each rotation of the syringe (22).