DE1247914B - Automatic knotter on winding machines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B 65h

German class: 76d-ll

Number: 1 247 914

File number: R 33460 VII a / 76 d

Filing date: September 7, 1962

Opened on: August 17, 1967

The invention relates to an automatic knotter on winding machines with a presence the two thread ends to be knotted monitoring device. Such automatic Knotters on winding machines have the task of automatically connecting the thread end of a pay-off bobbin with the To knot the thread end of a winding bobbin. This case occurs, for example, after a thread break or a bobbin change. However, knot errors can occur during further processing of the thread, at the latest in the finished fabric, are very annoying.

A hand knotter has become known through the German utility model 1 856 495, in which to To avoid incorrect knots, the correct insertion of the two thread ends in guide slots of the knotter is monitored. With automatic knotters, where the thread ends automatically in the Knotters are inserted, such an incorrect insertion of the thread ends is extremely rare, if not completely excluded. On the other hand, however, automatic knotters fail for other reasons on, for example, in that more than two threads are inserted into the knotter. With automatic As is known, the two thread ends to be connected, the pay-off bobbin and the winding bobbin, are knotted grasped by appropriated gripping organs and inserted into the knotter. Under unfavorable conditions it can happen that one or both ends of the thread are on the bobbin or on a machine part be held so that the gripping member leads the thread in the form of a loop to the knotter. on In this way, the corresponding thread is presented to the knotter as a double thread. The knotter connects Now the double thread with the other end of the thread so that the double thread is also wound in.

Another possibility for knotting a double thread is that from the supply magazine the winding machine when changing the unwinding bobbins, for example because of faulty tubes, two bobbins are inserted and the two thread ends laid ready are fed to the knotter by the gripper will. In this case, both thread ends are knotted with the thread end of the take-up spool, like this that a double thread is wound in over great lengths.

With automatic winding machines that do not have a built-in knotter at each winding unit, but rather Where a knotter monitors a larger number of winding positions, either the knotter moves past the winding units, or the winding units run past the knotter. It can happen Automatic knotter on winding machines

Applicant:

Dr.-Ing. Walter Reiners,

Mönchengladbach, Peter-Nonnenmühlen-Allee 54

Named as inventor:

Walter Gith, Mönchengladbach;

Hans Raasch, Rheydt

that the bobbin thread is inserted into the knotter, but the upper thread is missing. Even if here no knot is made, the bobbin thread can get stuck in the knotter. He will then from the knotting device to the next winding station to be knotted, so that a so-called Forms trailing paths. Since this towed thread is captured by the running thread of another winding unit and can be wound in, this error also leads to the winding in of a double thread.

Regardless of the way in which a double thread is inserted into the knotter, such Errors from the known automatic knotters on winding machines are not detected. You can also not recognized by the device known from the German utility model 1856 495 so that this device can be used to monitor the presence of the two to be knotted Thread ends are not suitable for automatic knotters on winding machines.

The invention is based on the object of an automatic knotter on winding machines with a to create the presence of the two thread ends to be knotted monitoring device, which identifies possible wrong knots of the most diverse causes and a winding up of the Kriot error prevented. The solution to this problem is according to the invention that the measuring device in the thread run in front of and / or behind the binding bill or the binding beaks for determination the thread dimension of the thread or threads inserted in the knotter and one of these Measuring device controllable thread separating device are arranged. Based on the determined thread dimension can be determined with certainty,

709 637/424

3 4

whether properly two single threads for knotting threshold to the total difference fluctuates both in

inserted or not. Does the measuring device depend on the light intensity as well as on the

detects an error, it prevents the thread size.

Measuring device controllable thread cutting device To eliminate such fluctuations and

further processing of the thread. 5 in particular the measuring device is not at one

If, for example, only one measuring device is to be readjusted each time the yarn number changes

To have to run the thread behind the binding beak or the binding-, it is also particularly advantageous to

arranged beaks, so in this case, a third light-sensitive cell could be arranged

there is a double thread inserted by the pay-off bobbin, the light beam of which does not affect the thread ends

the thread leading to the package is knotted io can be influenced. In this way, the threshold,

and run in the direction of the winding unit. When it is exceeded, the thread separating device

However, this double thread also comes into operation, automatically increasing the brightness

Area of the measuring device, which are adjusted based on and the thread thickness,

enlarged thread dimension the double thread with reference to those shown in FIGS. 1 to 8

means and by actuating the thread separating device, the invention is explained in more detail.

processing interrupts the winding process. The winding unit cleans.

consequently finds a thread breakage, and the In FIGS. 1 and 2, the invention is based on the knotter, causing a new knot to take place before a knot known per se for production. This pulls the thread of the winding spool of a fisherman's knot. The decreasing gripping member consists of this thread so far into the measuring device from two capacitors 1 and 2, knotter, that the defective piece is attached to the knotter in this case with the one. These faulty knots are no longer incorporated into the knotter. Attachment to the knotter has the advantage that it is laid. After the new knotting, the thread dimension of the thread placed in the knotter is cut off by the separating means of the knotter of the defective dens or the threads directly at the knotter gemes knot and transferred to the waste. 25 sen can be. Instead, however, it is also possible. If, on the other hand, the measuring device has determined that the borrowed thread leading to the measuring device is missing near the knotter to the take-up bobbin, it can be arranged evenly, but outside of the normal thread case the thread leading to the pay-off bobbin is cut , so that only the thread dimension of the in th and the loose thread end that may still be inserted into the binding knotter or the hanging loose thread end is averaged, for example, 3 °. However, if the measuring device is how to be removed by a suction nozzle. placed, attached directly to the knotter, so this has

For the measuring device for determining the thread, the additional advantage that by a second

dimension is a non-contact measuring device that can be used to determine whether the binding

particularly advantageous. In doing so, the measuring device beaks S and 6 after the tying of the knot

both on the volume and on which the thread ends have been cut correctly. A

Address the diameter of the thread (s). For badly cutting beak leads namely

In many cases, a measuring device has proven itself, also leading to undesirable knot errors, since that is not the case

which is coiled in as a known dielectric meter, cut off the thread end,

is trained. This is a bobbin thread 3 coming from the pay-off bobbin

the volume of the inserted thread responsive 40 is inserted into the measuring capacitor 1, during the

Measuring device in which the upper thread 4 coming through the thread from the winding bobbin is inserted into the

called change of the dielectric constant measuring capacitor 2 is inserted.

a capacitive probe used for the measurement. 5 shows a schematic circuit diagram of the

will. ser measuring device. You can see the two

In some cases, however, it can also be advantageous for the measuring capacitors 1 and 2, in which the threads 3 are inserted, instead of a volume measurement, a diameter and 4 are inserted. The two capacitors 1 to carry out sampling of the thread. For this purpose, it is known, for example, from a power supply unit 25 to feed at least two light-sensitive ones arranged at an angle to one another, an oscillator or high-frequency generator 26. In addition to the cells, the measuring bridge is to be arranged, whereby the thread to be measured in 50 two capacitors 1 and 2 also the resistances of the crossing point of the cells acting on 28, 29. Is that through the capacitors 1 and 2 light rays. With such a device and the resistors 28, 29, it is particularly advantageous if the upper thread 4 is missing for all light weights, for example because a common light source is provided for the beams, or because the upper thread 4 is missing instead of the so that operating-related differences in brightness 55 lower thread 3 several threads are inserted, then either of the two light sources can not affect the measurement result at points A, B an electrical voltage. With this arrangement, an amplifier 27 can be supplied. The only the difference in diameter of the thread from in the amplifier 27 amplified tension between the different directions in the measurement result points A and B is then the magnet 20 to a. 60 actuation of the scissors 19 supplied. In the pathogen

However, it is not always desirable that the circuit of the magnet 20 is also a circuit

every smallest difference in diameter to a thread 22 to temporarily switch on the measuring device

separation leads, as it is known that textile thread is not provided. As a result, the measuring device

are always circular, but also slightly flattened not to be switched on all the time, but only

can be. As a result, such fronts are 65 when the threads are inserted or in addition

directions designed in such a way that only after they have been exceeded, even when the knotting process is finished. That

At a certain threshold the thread separating device is then switched on to determine whether

is put into action. The ratio of these is the correct number of thread ends inserted

The second measurement determines whether the thread ends are properly cut after the knot.

F i g. 2 shows the knotter after the binding beaks 5 and 6 have formed the loops of the knot and cut the free thread ends. In this position, no more threads may be present in the two measuring capacitors 1 and 2. In the in F i g. 5 described bridge circuit will therefore also result in this measurement equilibrium. However, should a thread not be cut, a different impedance would result in one measuring capacitor than in the other capacitor and a voltage would again arise between the neutral points A ₁ B of the bridge circuit, which voltage can be used to indicate a wrong knot.

F i g. 3 shows a cross section through an automatic cheese winder, in which the thread F coming from the pay-off bobbin 10 is wound onto the take-up bobbin 11. The thread path F is shown in dash-dotted lines, since in this case it has been assumed that a reel spool change is being carried out and, as a result, the thread is not present. The tender 14 with the knotting device 15 running along the machine on the support tubes 12 and 13 can be seen of the gripper 17 is detected and inserted into the knotter 15, so that for the thread F ' inserted into the knotter, the course shown in dashed lines outside the normal, dot-dashed thread path F results.

A pair of scissors 19 is attached between the thread tensioner 18 and the knotter 15, preferably in the vicinity of the thread tensioner 18. The actuation of these scissors 19 is triggered by the measuring device 1, 2 (FIGS. 1, 2) arranged on the knotter in the course of the thread F ' inserted in the knotter, when the mentioned bridge equilibrium is disturbed during a measurement. This triggering of the scissors 19 can according to FIG. 4 take place by the magnet 20, which is excited depending on the disturbed equilibrium - possibly via an amplifier. As long as the magnet 20 is not excited, the scissors 19 is held in the open state by the spring 19 α. The armature 20 α of the magnet 20 is raised by the spring 20 b in the deenergized state of the magnet 20. As soon as the magnet 20 is excited, the armature 20 α is drawn into the magnet against the force of the spring 20 b , so that the lower end 20 c meets the pivotable arm 19 b of the scissors49 and closes the scissors.

The already in F i g. 5 mentioned switch 22 for temporarily switching on the monitoring device is operated by a cam 21 which is mounted on an axis 23, which in known Way, the processes for actuating the knotter 15 triggers. This creates a synchronization between the knotting movement and the activation of the measuring device achieved.

With certain types of yarn it can happen that the thread cross-section and thus the thread volume Subject to fluctuations. Extensive cross-sectional measurements on textile thread have shown that the smallest and largest thread cross-sections of one and the same thread count in a ratio of 1: 2 can fluctuate. This means that in the case of a stationary measurement, a thicker piece of thread is used Yarn can have the same cross-section as two thin pieces of thread of this yarn together. However, this simulates a knot error in the capacitive detection of the thread cross-section, since the thicker thread of the measuring device gives the impression of two thinner threads. This Disadvantage can be eliminated by the fact that instead of

ίο described cross-section or volume measurement a diameter scan of the thread is carried out.

F i g. 6 shows two adjacent. Threads with the cross-sections I and II. It is assumed that the cross-section II is twice as large as the cross-section I. There are therefore two cross-sections next to one another, as two pieces of thread can have in the worst case. If the diameters α and b are sampled, either at the same time

ac or one after the other and if the values obtained are compared with one another, it is found that even in this unfavorable case the measured values deviate from one another by at least 71%. If both threads are the same, then there is a theoretical increase of 100%. Even with the assumption that the threads are not exactly circular, there is still, as experiments have shown, an abundant leap in distinction. The diameter scanning can take place once in the direction of the arrow χ and once in the direction of the arrow y.

A measuring device which can detect the thread diameter both in the direction of the arrow χ and in the direction of the arrow y in FIG. 6 is shown in FIG. 7 shown. In this case, two light-sensitive cells 31, 32 arranged at an angle to one another are provided in a manner known per se, the thread to be measured lying in the intersection of the light beams acting on the cells. A common light source 34 is provided for both light beams, which guarantees the same brightness of both light beams. The light from the incandescent lamp 34 is split in a lens 35 into parallel light beams which are deflected in a prism 36 so that the same amount of light falls on both photo elements 31, 32. If a single thread F is inserted into the measuring section, the incidence of light on both photo elements 31, 32 is ideally reduced to the same degree, so that both photo elements emit the same voltage. These photo elements 31, 32 are located in a bridge circuit which is balanced by the variable resistor 33 in such a way that no voltage occurs at the neutral points C, D. However, according to FIG. If two threads are inserted into the measuring section, the lower photo element 32 is covered more than the lateral photo element 31. Thus, a lower tension arises on the photo element 32 and the bridge equilibrium is disturbed. This also creates a voltage at points C, D of the circuit which - amplified in the amplifier 27 - allows the cut-off magnet 20 to respond. The correct time for the measurement is given again by the aforementioned switch 22. In addition, one recognizes in FIG. 7 the power supply unit 25.

In many cases, the arrangement of a single one is sufficient Measuring device at the location of the capacitor 1 or 2 in Fig. 1. However, two measuring devices arranged, so can be in the circuit

i 247 914

Measure F ig .7 the points C ₁ D of both measuring points merged in an amplifier and work in parallel but independently of each other.

In Fig. 8 shows a preferred embodiment in which, in addition to the two light-sensitive cells 31, 32, a third light-sensitive cell 37 is arranged, the light beam of which cannot be influenced by the thread ends. For the sake of simplicity, the light source with the lens is no longer shown here, but only the parallel light rays are shown. The photo elements 31 and 37 are acted upon directly by the light beams, while the light beams for the photo element 32 are deflected by 90 ° by a mirror 38. The double thread F ₁ , F ₂ lies in the intersection of the light beams impinging on the photo elements 31 and 32. All three photo elements are connected in such a way that there are two bridge circuits. The upper bridge circuit with the photo elements 31 and 37 and the variable resistor 39 results in a voltage drop across the resistor 40 which corresponds to the diameter of the narrow side of the two threads F ₁ , F ₂ , i.e. the measured value in the x direction of FIG. 6. The lower bridge circuit with the photo elements 31 and 32 as well as the resistor 41 results in a voltage drop across the resistor 42, which as in FIG. 7 corresponds to the difference between the diameters of the narrow and broad sides of the double thread, that is to say the difference between the measurements in the x-direction and the y-direction according to FIG. 6.

The voltage across resistor 40 corresponding to the measured value "diameter narrow side" becomes a Amplifier 43 is supplied, the output voltage of which is supplied to an amplifier 45 via a resistor 44 is, wherein the output voltage of the amplifier 43 is proportional to the diameter of the narrow side Provides threshold voltage for the response of the amplifier 45. It also gets the amplifier 45 the voltage of the resistor 42 corresponding to the diameter difference is supplied. So long the voltage drop across resistor 42 is less than that established across resistor 44 Threshold value, the amplifier 45 remains closed and the thread trimmer 20 cannot respond. Only when the voltage from resistor 42 exceeds the threshold voltage of the amplifier supplied by amplifier 43 45 exceeds, the magnet 20 is energized.

Even if the subclaims only apply in connection with the main claim, the invention is

Application is not limited to the illustrated embodiments. For example, it is possible to use the To achieve diameter scanning of the threads not only with the help of light beams, but also on others Way, for example with the help of a so-called ion mark sensor. In doing so, it forms an electrically charged tip forming a corona discharge around the thread an electrically conductive one Field, which has a different electrical conductance in the Air gap between the electrically charged tip and the counter electrode can occur than with two adjacent threads.

Claims (4)

Patent claims: 1. Automatic knotter on winding machines with a presence of the two to be knotted Yarn end monitoring device, characterized in that the measuring device in the yarn path in front of and / or behind the binding bill or the binding bill to determine the thread dimension of the in the Knotter inserted thread or threads as well as a thread cutting device controllable by this measuring device are arranged. 2. Monitoring device according to claim 1, characterized in that the measuring device is designed as a known dielectric meter. 3. Measuring device for threads according to claim 1 with at least two arranged at an angle to one another light-sensitive cells, with the thread to be measured in the intersection of the Cells acting on light beams, characterized in that for all light beams a common light source is provided. 4. Measuring device according to claim 3, characterized in that a third light-sensitive Cell is arranged, whose light beam cannot be influenced by the thread ends. Considered publications:
Patent No. 8834 of the Office for Inventions and Patents in the Soviet Zone of Occupation in Germany; German utility model No. 1 856 495;
Swiss Patent No. 276 689;
U.S. Patent No. 2,764,362. For this purpose 2 sheets of drawings