WO1997007045A1

WO1997007045A1 - Process for winding thread up into a spool

Info

Publication number: WO1997007045A1
Application number: PCT/DE1996/001514
Authority: WO
Inventors: Hermann Westrich
Original assignee: Barmag Ag
Priority date: 1995-08-16
Filing date: 1996-08-14
Publication date: 1997-02-27

Abstract

A process is disclosed for winding a thread up into a spool (6) around a spindle (5). The spool surface speed is determined or measured by a rotating contact roller (11). The distance between the axes of the contact roller (11) and spool spindle (5) is controlled depending on the force with which the contact roller is pressed onto the surface of the spool.

Description

DESCRIPTION

Method of winding a thread into a bobbin

The invention relates to a method for winding a thread into a bobbin according to the preamble of claim 1.

The dishwashing machine, in which the distance between the axis of the contact roller and the axis of the winding spindle is increased as the diameter of the winding increases by rotating a pin, is e.g. This is known, for example, from DE 40 18 095 (= US Pat. No. 5,100,072 (Bag. 1826). Here, the winding spindle is rotatably mounted in the journal. It is driven by a motor, which is controlled in such a way that the rotational speed of the coil essentially remains constant.

The distance is controlled as a function of the stroke movement of the contact roller, which is mounted on a movable support for this purpose. Furthermore, the winding machine has a relief device which counteracts the weight of the carrier and the contact roller and is adjustable for specifying the contact pressure between the contact roller and the coil.

The object of the invention is to design the method in such a way that the control of the center distance and the specification of the contact pressure take place uniformly and synchronously throughout the winding cycle.

The solution results from the characterizing part of claim 1.

The method according to the invention has the advantage that the distance between the axis of the contact roller and the axis of the coil is dependent on the increasing coil diameter is controlled by the contact pressure between the contact roller and the surface of the spool in such a way that a predetermined or constant setpoint value of the contact pressure can be set from the beginning to the end of the winding into a spool and is regulated.

A certain contact pressure is therefore given as the setpoint. This setpoint can be constant. However, it is also possible for this setpoint value to change in the course of the coil travel. A slow, constant change in the setpoint of the contact pressure is conceivable. However, it is particularly advantageous that the setpoint is continuously changed between a higher and a lower value according to a time program. This can happen in particular depending on the vibration behavior of the winding spindle. By switching the setpoint of the contact pressure to the higher value, the spindle is damped before the vibrations can build up to a harmful level. Subsequently, however, the contact pressure is reduced again by specifying a lower setpoint value in order to avoid damaging the contact pressure being too high on the structure of the coil. However, it is also possible for the setpoint value of the contact pressure to be changed as a function of the slip which occurs. This means that the setpoint of the contact pressure is switched to the higher value if slippage occurs between the contact roller and the coil surface. The control of the contact pressure specified here according to a time program or depending on the slip is also advantageous in the dishwashing machine according to the prior art.

The method according to this invention can be used in all winding machines in which the distance between the axes of the contact roller and winding spindle is increased as the winding diameter increases by moving the contact roller and / or by moving the winding spindle in the course of the winding travel in such a way that the contact between Contact- roller and spool surface is maintained with a certain predetermined contact pressure.

For this purpose, the contact roller or the winding spindle can be mounted on a carrier which allows a movement with a radial component to the coil or contact roller. This carrier is provided with a drive. The drive is connected to a measuring device for measuring the contact pressure and a setpoint input device in a control circuit. The drive is actuated as a function of the difference signal between the entered target value and the measured actual value of the contact pressure.

In particular, the carrier can be equipped as a rotatably driven turret. At least one winding spindle, but preferably two winding spindles, is rotatably mounted on this turret. These two winding spindles operate alternately. A bobbin is then formed on the one bobbin spindle, which is in contact with the contact roller, while the other bobbin spindle is in the waiting position. As the turret rotates continuously, the distance between the axes of the contact roller and the winding spindle in operation is continuously changed as a function of the measured contact pressure or the difference between the target value and the measured contact pressure.

Many methods are available for measuring the contact pressure.

The method according to claim 3 allows the measurement of the contact pressure or the contact pressure which is exerted by the contact roller on the winding spindle with little expenditure on equipment and sufficiently high accuracy. To carry out this method, the contact roller can be mounted on an elastically deformable carrier, the contact pressure then being determined in that the elastic deformation of the wearer is measured. Furthermore, it is possible to mount the contact roller in a rigid carrier in a spring-elastic manner and to measure the elastic change in position of the contact roller relative to the carrier and to use it as a reference signal for the contact pressure.

Another possibility is that the contact roller is mounted on a carrier movable in the direction of the coil, that the carrier is supported by a spring relative to the machine frame, and that one of the spring sizes, i.e. either the contact force of the spring on the machine frame or the spring travel is measured and serves as a reference signal for the contact pressure.

The method according to claims 4 and 5 allow the specification of a minimum contact force and the superimposition of an additional contact force which can be controlled by specifying its target value.

According to claim 5, the minimum contact force can be specified such that it is less than the weight.

The invention is described below on the basis of exemplary embodiments.

Show it:

1 shows the side view of a dishwasher in operation;

2 shows the front view of the winding machine in operation;

3 shows the side view of another exemplary embodiment.

The exemplary embodiments according to FIGS. 1/2 and 3 are described together below. Deviations of the Comments are made clear in the course of the description. It is pointed out that the description of FIG. 2 also fully fits the exemplary embodiment according to FIG. 3.

The threading machine 3 is supplied with the thread 3 at a constant speed. The thread 3 is first passed through the head thread guide 1, which forms the tip of the traversing triangle. The thread then moves in the direction of movement 2 to the traversing device 4, which will be described later.

Behind the traversing device, the thread on the contact roller 11 is deflected at more than 90 ° and then wound on the bobbin 6. The coil 6 is formed on the winding tube 10. The winding tube 10 is clamped on the freely rotatable winding spindle 5. The winding spindle 5 with the winding sleeve 10 clamped thereon and the coil to be formed thereon is in the beginning of the operating position.

The winding spindle 5 is mounted in a rotatable pin 18 and rotatably eccentrically thereto. The winding spindle 5 is driven by the synchronous motor 29. The synchronous motor 29 is fastened in alignment with the spindle on the pin 18. The synchronous motor is supplied with three-phase current of controllable frequency by frequency generator 30. The frequency transmitter 30 is controlled by a control unit 31, which is controlled by a speed sensor 53. The speed sensor 53 senses the speed of the contact roller 11. The control unit 31 controls the frequency generator 30 of the winding spindle 5 in such a way that the speed of the contact roller 11 and thus also the surface speed of the winding remains constant despite the increasing winding diameter.

In the embodiment of FIG. 3, two spindles 5 are mounted in the journal. The spindles 5, including their drive, are of identical design. A b

Spindle is in operation, the other one is currently at rest and the coils made on this spindle have already been removed.

The pin 18 is rotatably mounted in the frame 17 of the dishwasher and is pivoted by the drive motor 33. The journal motor 33 serves to rotate the journal in the sense that the center distance between the contact roller 11 and the spindle 5 is increased as the coil diameter increases.

1, the contact roller 11 is mounted on a rocker 48, so that the contact roller can perform a movement in a radial component to the spindle. The rocker 48 is pivotally mounted in the machine frame about the pivot axis 50. The pivot axis 50 is formed by a rubber block. This rubber block is firmly clamped in the machine frame. The rocker 48 is attached to the rubber block, so that the rocker 48 can be pivoted in a rubber-elastic manner. This rubber-elastic bearing acts like a spring, which acts on the rocker 48 in the sense of increasing the contact pressure. A cylinder-piston unit 21, which is acted upon pneumatically and which acts on the rocker 48 against the weight from below, can fully or partially compensate for the weight which is on the contact roller and thus as a pressing force on the coil. so that a fine adjustment of a basic value of the desired contact pressure between the contact roller and the coil surface can be adjusted. The compression spring 51 also acts on the rocker 48. The compression spring 51 is supported on its opposite side on a load cell 52 arranged in a fixed position on the machine frame. In the initial position of the rocker 48, the load cell 52 is set via the tensioned compression spring 51 to a force value proportional to the contact pressure, which represents the target value of the contact pressure. The load cell 52 is connected to the control device 54 for the pin drive 33. In Depending on the output signal, ie, for example, when the setpoint of the contact pressure is exceeded, the load cell 52 gives an output signal which is sent to the control device 54. The further function will be discussed later.

In the exemplary embodiment according to FIG. 3, the contact roller 11 is mounted in a carrier 48 which has a rod at each of the two ends of the contact roller, which rod is firmly clamped in the machine frame 17. The strain gauges 58 and 59, which are glued to at least one of the rods on the top and the bottom, measure the bending of the rod when the diameter of the coil 6 increases. The strain gauges 58, 59 are part of a Wheatstone's bridge circuit. The resistor 61 of the bridge circuit is adjustable so that the target value of the contact pressure can be set. The output signal of the bridge circuit is passed to the control device 54. The pin drive 33 is controlled by the control device 54 in such a way that the contact pressure essentially corresponds to the setpoint.

In the embodiment according to FIG. 1, the traversing device is designed as a so-called "wing traversing". It has two rotors 12 and 13 which are connected to one another by a gear 22 and are driven by the motor 14. Wings 8 and 9 are attached to the rotors 12 and 13. The rotors rotate with different directions of rotation 27 and 28 and in doing so guide the thread along a guide ruler 9, one wing taking over the guidance in one direction and then immersing under the guide ruler, while the other wing guiding in the other Direction takes over and then dips under the ruler. The traversing device 4 is movably mounted in the machine frame of the dishwasher. A rocker 49 is used for this purpose. bar is mounted that the traversing device can perform a movement perpendicular to itself and to the contact roller, ie a parallel displacement.

In the exemplary embodiment according to FIG. 3, a so-called reverse thread shaft traversing is indicated as traversing device 4.

The mode of operation of the dishwasher is described below:

1 and 3, the operation of the winding spindle 5 is shown. Only a few layers are wound on the empty tube 10 and the contact roller 11 is in circumferential contact with the coil to be formed. As the bobbin diameter increases, the contact roller is moved in the radial direction. This movement leads to the fact that - in FIG. 1 - the compression spring 51 tightens more than the load cell 52 and causes a change in force in the load cell 52. In FIG. 3, on the other hand, the bending of the carrier causes a change in resistance on the strain gauges 58, 59 and accordingly a detuning of the bridge circuit 60.

Depending on the output signal of the load cell 52 or the bridge circuit 60, the journal motor 33 is controlled via the control device 54 in such a way that the journal rotates further by a small angle of rotation, in the sense that the center distance between the contact roller 11 and the winding spindle 5 is increased .

As soon as the contact roller again accepts the nominal system pressure stored in the load cell 52, the journal motor is deactivated.

The end position of the bobbin is marked with (6) and the end position of the bobbin spindle with (5). During the entire winding cycle, it is thus ensured that a constant or predetermined contact pressure between the contact roller 11 of the Surface remains.

With a corresponding selection of the spring 51, the slightest deflection movements of the contact roller 11 can therefore lead to a change in force in the load cell 52. It is also possible that the pin receives a continuously acting drive, the speed of which depends on the measured value.

It is possible to constantly specify the setpoint of the contact pressure. It is also possible to change the setpoint of the system force in the load cell 52 continuously or in stages or alternately between two setpoints and to achieve a corresponding change in the contact pressure between the contact roller and the coil. In Fig. 3, two winding spindles are mounted on the pin, which are offset by 180 ° to each other. These winding spindles can then be operated alternately by rotating the turret at the start of a new spool by 180 ° in such a way that the chuck or the empty sleeve stretched thereon lies against the contact roller.

REFERENCE SIGN LISTING

Head thread guide

Thread running direction

thread

Traversing device

Winding spindle

Kitchen sink

wing

Guideline

Bobbin

Contact roller

rotor

Traversing motor

Delivery plant

Coil turret

scope

ball-bearing

Cylinder-piston unit

Traversing gear

Lifting device

Direction of rotation

engine

Frequency transmitter

control unit

Journal motor

Swivel axis

wing

Swivel axis

compression spring

Load cell

Rotary sensor

Rotary control device Direction of rotation

Direction of rotation

Operating area

Strain gauges

Wheatstone 'see bridge circuit

resistance

Claims

PATENT CLAIMS

1. A method for winding a thread (3) into a bobbin (6), in which the bobbin (6) is spanned on a bobbin spindle (5), in which the surface speed of the bobbin (6) by a rotating contact roller (11) is determined or measured, in which the distance between the axes of the contact roller (11) and the winding spindle (6) is controlled as a function of the coil diameter, and in which the contact pressure between the contact roller and the coil is predetermined, thereby characterized in that the distance is controlled as a function of the contact pressure (contact pressure) with which the contact roller (11) rests on the surface of the coil (6).

2. The method according to claim 1 in a winding machine in which the winding spindle is mounted on a rotatable turret eccentrically to its axis of rotation, characterized in that the control of the distance between the axes of the contact roller (11) and winding spindle (6) by the Dreh¬ Movement of the revolver takes place.

3. The method according to claim 1 or claim 2 in a Aufspülmaschine, in which the contact roller (11) relative to the machine frame (17) is radially resiliently movable to the coil (rocker (48)), characterized in that the contact pressure determines is that one of the spring sizes (reaction force of the spring or spring travel) is measured.

4. The method according to any one of claims 1 or 2 in a rinsing machine in which the contact roller rests on the spool under the weight of the contact roller and its carrier, characterized in that the weight is supported by a spring supported on the machine frame, the spring size ( Reaction force or spring travel) is measured to determine the bearing force.

5. The method according to claim 4, characterized in that a counter force directed against the weight force, which is smaller than the weight force and preferably adjustable, acts on the carrier.