DE1271308B - Heating device for warming up and moving artificial threads or foils - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN V / ßTTWl · PATENT OFFICE

EDITORIAL

Int. CL:

D 02g

German class: 29 a-6/31

Number:
File number:
Registration date:
Display day:

1271308
P 12 71 308.5-26
January 11, 1963
June 27, 1968

The invention relates to a heating device for heating and moving artificial threads or foils, especially when stretching the same, consisting of a conveyor roller and several, within the conveyor roller and at equal winding intervals around the conveyor roller axis distributed electromagnets with radially directed poles, the electromagnets are arranged such that the Field lines of the magnetic field run at least partially transversely to the jacket of the conveyor roller.

Such a heating device for heating and moving artificial threads or foils is known. This known heating device has four provided symmetrically to the conveyor roller axis Electromagnets that generate a stationary magnetic field and are either arranged in a stationary manner or move in opposite directions when the conveyor roller rotates. This arrangement has the disadvantage that the Conveyor roller is only heated during its rotational movement, while when the conveyor roller is at a standstill and heating of the electromagnet is not possible. Furthermore, the known arrangement requires in the case where the electromagnets are rotatable, the provision of slip rings around the To be able to supply the required supply current to the magnets. Such slip rings and the associated ones Current collector brushes are subject to relatively high levels of wear, so that for this reason, frequent maintenance of the heating device becomes necessary.

A further disadvantage of the known heating device is that for temperature control of the conveyor roller the distance between the magnetic poles and the relevant metal part of the conveyor roller is set will. But this requires a relatively complicated construction, which also no fine adjustment possible.

The invention is based on the object of the known heating device for heating and moving of artificial threads or foils so that the conveyor roller can also be improved during their Standstill is heated, the degree of heating being set precisely and with very fine gradation can be.

This object is achieved in a heating device of the type described in that the Windings of the electromagnets connected to a three-phase power source with adjustable frequency are.

By using a rotating field according to the invention for inductive heating of the conveyor roller becomes continuous heating of the same heater for heating

and moving artificial threads

or foils

Applicant:

NV Onderzoekingsinstituut Research,
Arnhem (Netherlands)

Representative:

Dipl.-Chem. Dr. phil. E. Jung, patent attorney,

8000 Munich 23, Siegesstr. 26th

Named as inventor:

Dipl.-Ing. Andre Benoit de la Bretoniere,

Oosterbeek (Netherlands)

Claimed priority:

Netherlands 12 January 1962 (273 488)

achieved regardless of whether the conveyor roller is rotating or not. Furthermore, since the frequency of three-phase power sources can be adjusted very precisely, the measure according to the invention is a very precise and fine adjustment of the degree of Conveyor roller heating possible.

Furthermore, in a heating device designed according to the invention with a relatively weak magnetic field a strong conveyor roller heating can be achieved when the frequency the three-phase power source is selected to be correspondingly high.

It should be noted in this connection that it is not absolutely necessary that the frequency of the three-phase power source is adjustable. Rather, in some cases it may be sufficient if according to the invention the windings of the electromagnets to a three-phase power source with constant Frequency are connected, since this measure already has the advantage indicated above brings that the conveyor roller is heated even during its standstill.

The invention is explained in more detail below with reference to the schematic drawing described.

F i g. 1 shows a longitudinal section through a device according to the invention trained heater;

809 567/445

F i g. 2 shows a cross-sectional representation along the section line Π-ΙΙ of FIG. 1 while

F i g. 3 shows schematically the electrical circuit of the heating device according to the invention.

According to the figures, the heating device comprises a conveyor roller 1 as part of a draw twister, this conveyor roller 1 being driven by the shaft 2 of a synchronous motor 3. The wave 2 is at its free end 4 is conical and ends in a threaded shaft stub.

The conveyor roller is designed so that it with its conical part 6 on the conical end 4 of the Shaft 2 fits, against which it fits with the HiKe of a nut 5 screwed onto the shaft stub of shaft 2 can be pressed, which in the tightened position not over the end face of the conveyor roller 1 protrudes. Between the conical surfaces of the shaft end 4 and the conical part 6 of the conveyor roller 1 a thin layer 7 of solid, heat-insulating material is provided.

At the lower end of the cylindrical circumference of the conveyor roller 1, a flange is provided, which serves to prevent yarn turns from sliding off the roller in the direction of the motor 3 to prevent.

The shaft 2 and the conical part 6 of the conveyor roller 1 seated on it are of a cylinder 10 enclosed, with the help of countersunk head screw, which through the flange9 to reach through to the motor housing, is attached to the housing of the electric motor. This cylinder 10 has a thickened part 12 with three elongated recesses into which three electromagnets 13, which are cemented to the thickened cylinder section 12. These electromagnets are from the conveyor roller 1 enclosed at a distance, with between the electromagnet and the conveyor roller a foil 14 made of electrolytically pure copper is inserted, which is attached to the inside of the conveyor roller 1 in a distance of 0.2 mm from the poles of the electromagnets and a thickness of 2 mm owns.

The three electromagnets 13 are arranged according to FIG. 2 at an angle of 120 ° to one another and have windings 15 which are connected in a delta connection as shown in FIG. 3 shown is. Alternatively, it is also easily possible to connect the windings 15 in a Y-shape.

The corner points of the delta connection are shown in FIG. 3 with the help of resistors 16 with the three Terminals of a three-phase generator 17 connected. The resistors 16 are mechanical coupled together so that the tensions at the vertices of the triangle when the position of the taps at the resistors is varied, each time keeping the same amplitudes. The three-phase power generator 17 is driven by a shaft 19 which, via a built-in speed change device, which is operated via a handwheel 18 with the rotor of the generator 17 is coupled. By turning the handwheel 18, the frequency of the supplied three-phase current can be varied continuously within certain limits. Thus, the heat, which in the Conveyor roller 1 is to be developed with the help of the handwheel 18 and with the help of the resistors 16 in the size can be set exactly.

A variable transformer can be used in place of the resistors, preferably can also serve to regulate the stator field of the three-phase current generator 17.

Claims (1)

Claim: Heating device for heating and moving artificial threads or foils, in particular when stretching the same, consisting of a conveyor roller and several within the conveyor roller and electromagnets distributed at equal angular intervals around the conveyor roller axis with radially directed poles, the electromagnets are arranged such that the Field lines of the magnetic field run at least partially transversely to the jacket of the conveyor roller, characterized in that the windings (15) the electromagnet (13) to a three-phase power source (17) with adjustable Frequency are connected. Considered publications:
Belgian patent specification No. 615 687. For this purpose, 1 sheet of drawings 809 567/445 6.68 © Bundesdiuckerei Berlin