DE1149959B - Electromagnetically controlled device to keep the wire tension of thin wires constant - Google Patents

Description

GERMAN

PATENT OFFICE

kl. 47 k 3/04

INTERNATIONAL KL.

HOId; B21c

M 49860 IXc / 47k

REGISTRATION DATE: JULY 26, 1961

NOTICE THE REGISTRATION ANDOUTPUTE EDITORIAL: JUNE 6, 1963

There is a wide variety of withdrawal systems for wires known on winding machines for electrical coils. Most of these come with a mechanical one Control system equipped, in which by the movement of an arm under tension which a wire pulley sits, a shoe or band brake is controlled, which depending on the Wire tension more or less brakes the wire supply roll from which the wire is drawn off.

This system has the disadvantage that the regulation is not fast enough. Thinner wires with A diameter of less than 0.06 mm has to be removed very quickly on the newer winding machines and a not sufficiently fast regulation can lead to wire breaks.

An electrically operating device for keeping the wire tension constant is also known, in which on the supply reel that supplies the winding wire and revolves around one electromagnetic The braking force generated acts, which is periodically variable. The periodicity is determined by the speed of rotation a flat grille to be wound that is used as a control grille for discharge tubes should be determined.

There is also already an electromagnetically controlled device known in which on the A brake motor is arranged on the axis of a revolving supply reel that supplies the wire to be processed is. In this device there is also a role at the end of a resilient swing arm which wire to be processed runs. If the longitudinal tension of the wire fluctuates, the swing arm becomes twists and controls a current photoelectrically, which after amplification the brake motor is supplied so that the braking force exerted on the supply reel of the new size of the Longitudinal pull of the wire is adjusted.

However, the two last-mentioned devices also allow the speed of regulation, i. H. there is still much to be desired with regard to the highest applicable withdrawal speed of the wire.

The invention is based on an electromagnetically controlled device for keeping the Wire tensioning of thin wires in winding machines using a braking device for the wire running off the supply reel and a wire guide roller mounted on a resilient swing arm, which shifts with fluctuations in the longitudinal tension of the wire and thereby by twisting of the swing arm acts on the braking device.

The invention is characterized in that at

Electromagnetically controlled device

to keep the wire tension constant

of thin wires

Applicant:

MicafilA.G.,

Zurich-Altstetten (Switzerland)

Representative: Dr.-Ing. E. Sommerfeld

and Dr. D. v. Bezold, patent attorneys,

Munich 23, Dunantstr. 6th

Albert Baud, Paudex (Switzerland),
has been named as the inventor

an angular movement of the swing arm with respect to the central position corresponding to the desired wire tension a magnetic yoke causes an asymmetry of the two magnetic fluxes of a double magnet and that according to this disturbance of the flux symmetry the current in the excitation coil of an electromagnet changes, depending on the excitation current, a more or less strong magnetic field in his Generated air gap in which there is a plastic bag filled with iron powder, which arches depending on the field strength and thereby the wire over a diamond plate lying on it, which is pulled from the stationary supply reel through the air gap, more or less brakes heavily.

The device according to the invention can be seen in FIGS.

Fig. 1 shows the side view and

Figure 2 is the front view of the system;

Fig. 3 shows a section through the photoelectric control system of the machine with the wire broken or empty Supply roll;

Fig. 4 shows the arrangement of the wire guide rings and

5 shows the electrical block diagram of the control system for the wire tension control.

Explanation of the functional principle of the device: From the wire supply roll 1, which is horizontal on Angle 31 is screwed tight, the wire 2 is pulled off. The angle 31 is with the mounting plate 32 tied together. This is connected to the vertical column 24

309 599/88

welds. The column 24 is vertical in the control box 22 displaceably mounted and lockable in a desired position by means of the clamping screw 23. Of the Wire 2 coming from the supply roll 1 is passed through the wire guide rings 3, 4 and 5 to the pair of brushes 6, 6 ' and pulled through the same between the two brushes. For better insertion of the wire between these two brushes, the upper brush 6 'can be folded up. The two brushes serve as slight pre-brake of the wire in front of the control system. Now the wire 2 is in the air gap of an electromagnet 7 pulled through with excitation coil 17. The actual wire brake now consists of a with Iron dust-filled plastic bag 10, on which a vertically guided in slots of the lower magnetic pole Aluminum frame 8 is on which a thinly ground plate made of synthetic diamond 9 is glued. Depending on the intensity of the current in the excitation coil 17, the magnetic flux in the air gap is Electromagnet controlled. As a result, the iron dust in the plastic bag 10 becomes more or less strong attracted by the poles of the magnet and the plastic bag 10 consequently more or less strong arched. The curvature of the plastic bag 10 now presses the frame 8 with diamond plates lying on it 9 against the upper pole of the magnet 7, and the intermediate wire 2 is depending on the Buckling pressure more or less braked. The wire 2 still overflows after the magnet 7 a deflection roller 11 and from this via the roller 13 rotatably mounted on the swing arm 12 to not shown winding machine, see Fig. 1, 2 and 4. The swing arm 12 is fixed in the magnet yoke 14 and this is rotatably mounted in the end plates 37 and 33 by means of the axis 36. By turning the rotary knob 35, a torque is placed on the swing arm via the spring 34, which is the degree of the desired Wire tension in the neutral position of the magnet yoke 14 corresponds.

The magnet yoke 14 is separated from the poles of a double magnet 15 by a small air gap. Two magnetic force flows are generated in the double magnet 15. The first off the spool 16 and the second of coil 16 ', both of which from the high frequency part 26 of the electronic system with a current of 8000 Hz. If now the magnet yoke 14 is in its central, neutral position is what corresponds to a desired wire tension or a certain position of the swing arm 12 is the magnetic flux in the double magnet 15 is the same on both sides, since the coils 16 and 16 'have a common Have center tap. Is now made by changing the wire tension from the winding machine If the center position of the swing arm 12 is changed, then the magnet yoke 14 is also rotated. This will be the magnetic fluxes which pass through the coils 16 and 16 'are asymmetrical. Reels 16 and 16 ' have a common center tap which connects to the winding end of coil 16 'via a rectifier 27, an attenuator 28 and an amplifier part 29 and 30 the current of the coil 17 accordingly control the deflection of the magnetic yoke 14 from its central position, see Fig. 5. With the Current intensity of coil 17, the magnetic flux in the air gap of the magnet 7 is regulated and with this Via the plastic bag 10 with iron powder and the diamond plate 9 located on it, the braking force onto the wire guided in the air gap 2.

The power supply for the electronic control part is provided by the power pack 25. The intensity of the current for coil 17, the basic value can be set according to the wire diameter on the potentiometer knob 24 a will. With this device it is possible to instantly regulate the wire tension on the Achieve the set mean value and avoid wire breaks.

An additional safety device prevents wire breaks caused by inaccurate setting of the Device. It can be seen in FIG. 3. The swing arm 12 is next to the magnet yoke 14 still provided with a thin-walled cylinder tube piece 19, which each at the same angle as the swing arm 12 pivots about the axis 36. A photocell 20 is installed in the bearing plate 37, which is exposed by the light source 21. A thin-walled cylinder tube 18 is also on the end shield 37 arranged with a through hole 38, which is directly on the common axis of light source 21 and photocell 20 is seated. In this case, tube 18 is slipped over tube 19 and arranged concentrically therewith. If now the swing arm 12 swings out too much as a result of jerky excessive wire tension, comes the slot 39 in the axis of the light source 21 and photocell 20. The photocell 20 can through the light rays the light source 21, which can pass through the holes 38 and 39, are exposed and a Deliver control current. This current is fed through an amplifier to operate an unspecified one Parking mechanism of the winding machine used.

The same effect also occurs when z. B. the wire supply roll 1 is empty. Because the swing arm 12 does not have any tension at this moment due to the wire tension, it pivots as a result of it the spring 34 placed torque upwards, and the hole 40 in the rotatable cylinder tube 19 comes in the axis of light source 21 and photocell 20, and the winding machine is, as described above, also turned off.

Claims (2)

PATENT CLAIMS: 1. Electromagnetically controlled device for keeping the wire tension of thin wires constant in winding machines using a braking device for the wire running off the supply reel and a wire guide roller mounted on a resilient swing arm, which shifts when the longitudinal tension of the wire fluctuates and is caused by rotation of the swing arm the braking device acts, characterized in that in the event of an angular movement of the swing arm (12) with respect to the central position corresponding to the desired wire tension, a magnetic yoke (14) causes an asymmetry of the two magnetic fluxes of a double magnet (15) and that, corresponding to this disturbance of the flux symmetry, the Current in the excitation coil (17) of an electromagnet (7) changes which, depending on the excitation current, generates a more or less strong magnetic field in its air gap, in which there is a plastic bag (10) filled with iron powder, which is located depending on the field brane arches and thereby the wire, which from the stationary supply reel is pulled through the air gap, more or less brakes heavily. 2. Apparatus according to claim 1, characterized in that the rotational movement of the Swing arm (12) according to the wire tension of the wire (2) with the swing arm connected thin-walled cylinder tube (19) is rotated and thereby in the upper and lower Extreme position of the swing arm through openings in this cylinder tube from a light source (21) light rays through the opening (38) of a fixed cylinder tube (18) to a in the axis of rotation of the swing arm arranged photo cell (20) can pass through, whereby a Parking mechanism for the machine is controllable. Considered publications:
German Auslegeschriften No. 1054174,1065534. For this purpose 2 sheets of drawings © 309 599/88 5.