DE102010009166A1 - Hysteresis unit e.g. hysteresis brake, for use in unwinding creel of yarn packages for production of warp beams, has adjusting unit, where axial movement of adjusting unit generates digital output signal at position within movement area - Google Patents

Abstract

The unit (1) has a hysteresis carrier (2) and a magnet carrier (3), where a mutual axial position (4) of the carriers is variable by an adjusting unit (5). The adjusting unit is connected with a stepper motor (7) and a reduction gear stage (8) by a threaded pair (6) that forms an adjustable screw thread for the adjusting unit. A pointer (9) and a signal transmitter (10) are provided for determining axial movement (12) of the adjusting unit, where the movement generates a digital output signal at a position within a movement area (11) and when the pointer passes over the signal transmitter.

Description

The invention relates to a hysteresis according to the preamble of the main claim.

Such hysteresis units find use as a hysteresis clutch or hysteresis brake.

They are based on the hysteresis principle. In this case, a magnet carrier occupied with magnetic material is arranged opposite to a hysteresis carrier.

The two carriers rotate relative to each other. The driving force is adjusted via the mutual axial position.

The advantage of such hysteresis units is the freedom from wear.

Therefore, such hysteresis serve in particular as Hysteresebremsen, z. B. in the gate of thread bobbins for the production of warp beams.

Without limiting the invention, however, the present application is also intended to detect hysteresis clutches.

Finished hysteresis units are available as a central rotating arrangement or a face turning arrangement. The present invention is intended to refer to both embodiments.

In a central rotating assembly, one of the two carriers is listed as an immersion cylinder, which changes its axial position to the other carrier, which is made annular, by immersing in the annular carrier.

With such a central rotation arrangement, the immersion depth is linearly related to the hysteresis effect.

In a face turning arrangement hysteresis carrier and magnet carrier are axially spaced apart and the axial position is changed over the distance.

In such a face turning arrangement, the hysteresis effect is described by a mathematical hyperbola.

Within the scope of the present invention, both arrangements should be considered equivalently side by side.

This means that the term "axial position" in the case of an end arrangement is to be understood as the axial distance and in the case of a central rotation arrangement as the immersion depth.

Nevertheless, both embodiments should always be covered, unless it is expressly pointed out that the respective other embodiment should not be included.

It is known in this respect, to adjust the axial distance between Hysteresering and magnetic ring via an electric motor drive in such hysteresis units, the z. B. acts on a threaded spindle which engages in an internal thread of the actuating means.

The adjusting means serves the purpose of displacing the hysteresis ring or the magnetic ring axially with respect to the respective other ring.

The advantage of such thread pairings lies in particular in the self-locking.

In such hysteresis units, there is the danger that the motorized rotary drive can drive the adjusting means for shifting hysteresis ring or magnetic ring to block. As a result of the very significant reduction between electric motor drive and threaded spindle there is the danger of unduly high forces or excessive wear.

It is an object of the present invention to eliminate these disadvantages of a hysteresis unit of the generic type.

This object is achieved by the features of the main claim.

The essential aspect of the invention is based on detecting the axial movement of the actuating means at at least one single position within the entire range of motion and converting the passing over of this position into a digital output signal.

This is expediently carried out by the interaction of a pointer with a signal generator, wherein pointers or signal transmitters are fixedly mounted on the adjusting means and signal transmitter or pointer.

Within the scope of the present application, the terms "pointer" and "signal generator" are to be understood generally.

It is essential in any case the generation of a digital output signal from the circuit arrangement according to the invention.

A digital output signal can to this extent via an analog signal in conjunction with a electronic threshold circuit can be generated.

The analog signal could be generated for example via a potentiometer, which is then abandoned the threshold circuit.

If the threshold value is exceeded, a digital output signal would then be generated, which is used as the basis for the further control.

It is therefore a total of a digital output signal, which is forwarded electronically to fulfill predetermined functions of the hysteresis unit.

The invention requires according to the invention only a single pointer with associated signal generator.

If the digital output signal is generated, the output signal can be set, for example, by means of a corresponding counting logic and, for example when using a stepping motor, the steps taken can be counted.

Alternatively, it is possible to generate another digital output signal in accordance with the features of the main claim at another location of the movement range.

In this way, the range of movement of the actuating means is monitored in accordance with and it can be essential to the invention avoided that the motorized rotary drive at the end of the adjustment each runs on block.

The arrangement of the signal generator within the freely adjustable and not running on block adjustment thread is therefore essential to the invention.

In particular, in conjunction with a digitally controllable stepper motor, the invention comes with only a single point for generating the digital output signal.

The digital output signal can, for. B. generated at a point shortly before hysteresis ring and magnetic ring get mutual contact or in the case of a central rotation assembly, the full immersion depth or the full extended position is reached.

Then, the electric motor drive is polarized via the digital output signal, so that it can only run in that direction of rotation in which the distance between hysteresis ring and magnet ring increases again or the immersion depth changes in a predetermined manner.

Since it is a stepper motor that can be controlled digitally, it is also possible to count from there the steps that can be covered within the entire range of motion without risk of collision in accordance with the geometric conditions.

On the other hand, however, another digital output signal can also be generated in the region of the other end of the movement range, so that from there the stepper motor can be correspondingly reversed in order to exclude a risk of collision at this end of the movement range.

Appropriately, pointer and signal transmitter are housed within a closed housing, in which also sits the actuating means.

Pointers and signalers can communicate with each other in the manner of reed contacts, on the basis of the Hall effect or the light barrier effect.

Other options are also conceivable. These include magnetic signals, etc.

The arrangement of pointer and signal generator within the housing disturbances of adjacent hysteresis units, as present in particular in the process gate for the production of warp beams can be avoided.

Appropriately, the housing then has a cable bushing and a separate control board.

On the control board then the electronic modules for stepper motor control, for position evaluation and power supply are provided.

If you also want to use small stepper motors with low torques, it is advisable to provide a step down gear between the stepper motor and the actuating means.

In the following the invention will be explained in more detail with reference to an embodiment.

1 shows a hysteresis unit in the form of a hysteresis brake.

A hysteresis ring 2 is screwed for this purpose on a ring carrier, the z. B. consists of aluminum.

The common hub is seated on a rotatably mounted in the housing output shaft, which points to the right out of the housing.

Thus, the hysteresis would be 2 rotatable together with its mounting ring and the hub and the right outgoing shaft.

Opposite the hysteresis ring 2 sits a magnetic ring 3 , also on a support and a common hub, which also forms the adjusting means.

Over the above shown in a longitudinal slot of the housing pin prevents the actuating means 5 in the housing turns.

In the center of the actuating means 5 a central thread is introduced, which is pierced by the coming from the left and also mounted in the housing shaft.

For this purpose, the shaft has at its right-facing end a thread which in a corresponding internal thread of the actuating means 5 intervenes.

If the shaft now rotates, it will be over the thread pairing 6 between the right-pointing shaft end and the internal thread of the actuating means 5 an axial displacement of the actuating means 5 causes within the possible range of motion 11 lies.

It is essential now that a pointer 9 and an associated signal generator 10 are provided, which for detecting the axial movement 12 of the actuating agent 5 serve.

This will be at least one point within the range of motion 11 a digital output signal is generated as soon as the pointer 9 the said signal generator 10 exceeds.

The arrangement of pointers 9 and signalers 10 relative to each other can according to the invention at any point within the range of motion 11 lie.

Appropriately, however, become the pointer 9 and the associated signal generator 10 provided at a location where the actuating means 5 just before one end of the range of motion 11 the pointer 9 at the signal transmitter 10 passes by.

This measure offers the advantage that at least in the direction in which pointer 9 and signalers 10 towards the end of the range of motion 11 be relocated, run on block of the actuating means 5 is prevented.

Further shows 1 in that a further digital output signal is generated at a second location which is a predetermined distance from the first location.

For this purpose is another pointer 9 with another signal generator 10 intended. In the embodiment shown is rigid with the actuating means 5 an axially extending rod connected to which suitable pointer 9 are attached.

The two places where the digital output signal is generated, z. B. provided by suitable fork light barriers.

Now runs one of the pointers 9 via the appropriate light barrier, the on-off signal is given via appropriate lines for processing.

Shown is also the arrangement of pointer 9 and signalers 10 inside a closed housing 13 so that the hysteresis brake shown can readily be used in large quantities in the tightest of places, as z. B. in the run gate of coils for the production of warp beams is the case.

pointer 9 and signaling device or reading device 10 can communicate based on different effects based on each other.

Conceivable are the Hall effect, the interaction on the type of reed contacts or based on the light barrier effect or the like.

So that the generated digital signals can be led out of the housing, the housing has a cable feedthrough. There run the signal line (s), in which the digital output signals to a control board 15 be guided.

The control board 15 serves to accommodate electronic modules for stepper motor control, for position evaluation and for the power supply for the stepper motor.

In that regard, the motorized rotary drive is a stepping motor 7 which also has a downstream gear stage 8th on the actuator 5 acts, which with the thread pairing 6 for the axial displacement of the actuating means 5 is provided.

LIST OF REFERENCE NUMBERS

1

hysteresis

2

Hystereseträger

3

magnet carrier

4

axial position

5

actuating means

6

thread pairing

7

stepper motor

8th

gear stage

9

pointer

10

signaler

11

range of motion

12

axial movement

13

casing

14

Grommet

15

control board

Claims (13)

Hysteresis unit ( 1 ) as a hysteresis clutch or hysteresis brake with a hysteresis carrier ( 2 ) and a magnetic carrier ( 3 ) whose mutual axial position ( 4 ) via an actuating means ( 5 ), which with hysteresis carrier ( 2 ) or magnetic carrier ( 3 ) is variable, wherein the actuating means ( 5 ) via a thread pairing ( 6 ) with a motorized rotary drive ( 7 . 8th ) is connected, which the adjusting thread for the actuating means ( 5 ), characterized in that means with a pointer ( 9 ) and a signal generator ( 10 ) for detecting the axial movement ( 12 ) of the actuating agent ( 5 ) are provided, which at least one point within the range of motion ( 11 ) generate a digital output signal as soon as the pointer ( 9 ) said signal generator ( 10 ) exceeds. Hysteresis unit ( 1 ) according to claim 1, characterized in that the digital output signal just before one end of the movement range ( 11 ) is detected. Hysteresis unit ( 1 ) according to claim 1 or 2, characterized in that a further digital output signal is generated at a second location, which has a predetermined distance from the first location. Hysteresis unit ( 1 ) according to claim 3, characterized in that the second output signal is also from a pointer ( 9 ) and a signal generator ( 10 ) is produced. Hysteresis unit ( 1 ) according to one of claims 1 to 4, characterized in that pointers ( 9 ) and signal generator ( 10 ) within a closed housing ( 13 ), in which also the actuating means ( 5 ) is housed. Hysteresis unit ( 1 ) according to one of claims 1 to 5, characterized in that pointers ( 9 ) and signal generator ( 10 ) communicate with each other based on the Hall effect. Hysteresis unit ( 1 ) according to one of claims 1 to 5, characterized in that the pointer ( 9 ) and signal generator ( 10 ) interact in the manner of reed contacts. Hysteresis unit ( 1 ) according to one of claims 1 to 5, characterized in that pointers ( 9 ) and signal generator ( 10 ) communicate with each other based on the photoelectric effect. Hysteresis unit ( 1 ) according to one of claims 5 to 8, characterized in that the housing ( 13 ) a cable feedthrough ( 14 ) owns. Hysteresis unit ( 1 ) according to claim 9, characterized in that on the outside of the housing ( 13 ) a control board ( 15 ) is attached. Hysteresis unit ( 1 ) according to claim 10, characterized in that the control board ( 15 ) Contains means for receiving electronic components for stepper motor control, for position evaluation and for power supply. Hysteresis unit ( 1 ) according to one of claims 1 to 11, characterized in that a stepping motor ( 7 ) is provided. Hysteresis unit ( 1 ) according to claim 12, characterized in that between the stepping motor ( 7 ) and the actuating means ( 5 ) a reducing gear stage ( 8th ) is provided.

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