EP3333106B1 - Method for winding of a coiled item and coiling machine - Google Patents

Description

Method for winding a winding material and winding machine The method relates to a method for winding a winding material. The invention further relates to a winding machine. When winding a winding material, in particular a wire or a film, onto a winding body, a winding tension is regularly applied to the winding material. The winding tension corresponds to the force (per cross-sectional area) with which the winding material is wound onto the winding body. In modern devices for winding a winding material, the winding tension can be adjusted. In other words, the winding tension is the tensile stress of the winding material.

EP 2 485 227 A1 discloses a method for winding a winding material according to the preamble of claim 1 and a winding machine according to the preamble of claim 7.

EP 2 306 473 A1 describes a wire winding machine and a control system for such a wire winding machine.

WO2006133662A1 shows a method and a device for controlling the wire tension of a coil winding wire, in which a predetermined deceleration force is transmitted to the coil winding wire and the respective wire tension of the coil winding wire is detected during the winding process.

JPS60105210A shows a belt drive EP926090A2 shows a winding machine in which a controller controls a feed speed depending on a winding speed.

EP2617670A2 shows a tension device that can absorb changes in speed and keep a tension constant even when the speed of a wire rod changes.

According to the current state of the art, the winding tension, especially a non-constant winding tension, is difficult to adjust.

It is therefore an object of the invention to provide an improved method and an improved device for winding a winding material.

In particular, it is the object of the invention to control the winding tension during the winding process. The winding tension is preferably set to a constant value.

The object is achieved by a method according to claim 1.

The object is further achieved by a winding machine with a control device according to claim 7.

• Bereitstellung des Wickelgutes von der Versorgungsrolle,
• Aufwickeln des Wickelgutes auf den Wickelkörper,
  • wobei die Wickelspannung des Wickelgutes auf eine vorgegebene Wickelspannung einstellbar ist,
  • wobei die Wickelspannung durch eine Einstelleinheit auf die vorgegebene Wickelspannung eingestellt wird.

In the method for winding a winding material, in particular for winding a wire or a film onto a winding body with a non-circular cross-section, the winding material is wound onto the winding body from a supply roll. The method comprises at least the following steps:

• Provision of the winding material from the supply roll,
• Winding the winding material onto the winding body,
  • whereby the winding tension of the winding material can be adjusted to a predetermined winding tension,
  • The winding tension is adjusted to the specified winding tension by an adjustment unit.

The invention is based on the knowledge that a free length of the winding material between the support points of the winding material on the winding material and a deflection roller from which the winding material is wound, changes continuously. The The change is particularly significant for a winding body with a non-circular cross-section.

Furthermore, the invention is based on the knowledge that a winding material should be wound onto the winding body with a predetermined winding tension, which is not necessarily constant over time. However, in many applications, such as winding a battery cell, the winding tension should be kept as constant as possible during the entire winding process.

A supply roll is understood here to be a device for storing the winding material. For example, a wire wool or a roll on which the film is rolled up. The winding material can also be stacked. The supply roll can be assigned a second rotation speed so that the supply roll provides the winding material at a speed proportional to the second rotation speed.

The invention is particularly well suited for winding a winding body that has a non-circular cross-section and/or a non-constant diameter/radius. For example, such a winding body is elliptical or rectangular in shape.

The process presented here is particularly advantageous for producing battery cells or film capacitors.

The winding tension is the tension of the winding material. One way of defining the winding tension is the force that acts on the winding material perpendicular to its cross-sectional area, divided by the cross-sectional area. The cross-sectional area is often constant. The winding tension then corresponds to the force with which the winding material is "pulled away from the rotating winding body during winding".

The intended winding tension is the winding tension with which the winding material is to be wound onto the winding body. The intended winding tension can be shown as a function of the orientation of the winding body. For example, this is necessary when winding a wire around a square winding body in order to achieve a good result.

Preferably, the winding tension is proportional to the curvature of the winding body at the support point of the winding body. Such proportionality is particularly advantageous when winding metal wire.

However, it should be noted that the curvature of the winding body decreases due to the layers of material that have already been wound on. The adjustment unit is designed to adjust the winding tension. The winding material is influenced using the adjustment unit before it is wound onto the winding body.

In addition to adjusting the winding tension using the adjustment unit, the rotation speed of the winding body and/or the supply roll can be changed.

The rotation speed is adjusted by the drives, which are used to carry out the winding process with the help of a control device.

A computer program product can run on a computing unit and is designed to support the method for winding a winding material.

• die freie Länge berechnet,
• Einstellungen für das jeweilige Stellglied berechnet und bereitgestellt,
• und/oder die Größen für den Wickelvorgang berechnet.

The computer program is installed and stored on the computing unit. To run, the computer program product is loaded into the memory of the computing unit and executed by a processor. When the computer program product runs,

• the free length is calculated,
• Settings for the respective actuator are calculated and provided,
• and/or the sizes for the winding process are calculated.

The calculation and provision of the settings is done online to the control device.

• eine einfache und genaue Einstellung der Wickelspannung,
• bei online-Berechnung von Parametern für die Einstelleinheit oder der Drehgeschwindigkeiten eine geringe Einrichtzeit,
• Beachtung von einem Biegemoment oder Zugmoment beim Wickelprozess einfach möglich sowie
• eine erheblich genauere Einstellung der Wickelspannung im Vergleich zum derzeitigen Stand der Technik.

The method presented here has a number of advantages. In particular

• easy and precise adjustment of the winding tension,
• when calculating parameters for the setting unit or the rotation speeds online, a short setup time,
• Consideration of a bending moment or tensile moment during the winding process is easily possible as well as
• a significantly more precise adjustment of the winding tension compared to the current state of the art.

In principle, a second support point for the winding material is located on the last deflection roller for the winding material in front of the winding body.

The deflection roller is the one from which the winding material is guided to the winding body.

Due to the non-circular cross-section of the winding body, each revolution of the winding body results in a variable free length. The path difference per revolution of the winding body (orientation = 360°) should be compensated to keep the winding tension of the winding material constant. A winding tension is also referred to as web tension or winding material tension.

The invention is based in particular on the finding that during the winding process on a winding body with a non-circular cross-section, the distance between the support point of the winding material on the winding body and the support point of the winding material on a deflection roller changes as the winding body rotates.

Changing the distance between the support points results in a change in the winding tension. Changing the winding tension during winding leads to significant losses in quality.

A first solution is to compensate for the free length using a dancer roll, whereby the dancer roll assumes a position such that the winding tension is compensated. Such passive compensation is often slow.

However, a dancer roll can also be actively positioned using an actuator. By actively compensating the free length and optionally the different support points of the winding material on the deflection roll, the winding tension can be compensated quickly and easily.

Therefore, within the scope of the invention, the winding tension is compensated actively. For this purpose, a winding material storage device is set in such a way that its capacity is adjusted to compensate for the winding tension.

It is best to set the winding tension to a constant value. Depending on the application, the winding tension can can also be set to a non-constant course.

For example, with a square winding body, the winding tension can be set to a higher value when wrapping around the respective corner. In general, the winding tension can be based on the curvature of the winding body at the first support point.

The winding tension and thus the setting of the setting unit, particularly in the form of parameters, is calculated during the winding process. Such a calculation during the winding process is also referred to as an online calculation. A computing unit is used to calculate the respective setting, whereby the computing unit is assigned to a control device. The control device is used to control or regulate the motors and/or the respective actuators. By calculating the parameters for the setting unit online, time can be saved when setting up the winding machine and systematic errors can be compensated for by taking properties of the winding material into account in the calculation.

In order to adjust the winding material tension, a winding material brake with adjustable braking power is also advantageous. The winding material is guided over a deflection roller, whereby the deflection roller is coupled to a servo motor and the winding tension can be adjusted by adjusting the rotation speed.

A winding material brake can advantageously be supplemented by further options for adjusting the winding tension.

A winding material storage device has a plurality of deflection rollers, wherein the winding material is held by the plurality of deflection rollers on a path whose length can be changed. By changing the position of at least one of the deflection rollers, the length of the path can be adjusted.

The length of the winding material path corresponds to the capacity of the winding material storage. The position of the respective deflection roller is changed by an actuator.

A winding material accumulator can be combined with a dancer roll to compensate for slight fluctuations in the winding tension.

A variable winding material storage preferably has a plurality of deflection rollers, wherein the distance between the respective deflection rollers can be changed by means of a respective actuator.

A dancer roller can be used both to compensate for the winding tension and, in conjunction with a sensor, to determine the winding tension.

A dancer roller is a deflection roller whose position can be adjusted passively in one direction or actively with the help of an actuator. Preferably, a sensor determines the position of the dancer roller. The sensor can be used in conjunction with a spring construction as a force sensor. The winding tension can be determined directly with the help of the sensor or the force sensor.

To adjust the winding tension using the dancer roll, the position of the dancer roll is changed so that the length between the dancer roll and the corresponding deflection rolls is changed.

To determine the winding tension, the position of the dancer roll is determined using a sensor. If the winding tension increases, the position of the dancer roll changes towards the corresponding deflection rolls and vice versa. The position is recorded using the sensor.

The sensor can be designed as a position sensor. Preferably, the sensor is designed as a force sensor. The force sensor determines the force acting on the dancer roll and thereby determines the winding tension. By designing the sensor as a combination of position sensor and force sensor, a dancer roll can be used both to set and to determine the winding tension.

A force sensor is a sensor for determining the force acting on the winding material. For example, the force sensor can be designed to determine the position of a deflection roller held in position by a spring. The force sensor is therefore able to directly determine the winding tension of the winding material.

A control device is used to regulate the winding tension to a constant value or to a predetermined winding tension.

The input of the control device is preferably a sensor that determines the current winding tension. The control device preferably has the intended winding tension as a further input variable. The intended winding tension can be a constant value. The winding tension can also be a function of the orientation of the winding body. The winding tension is preferably calculated during the winding process. The settings of the actuators and the rotation speeds, in particular as a function of the intended winding tension, are calculated online.

The control device is preferably designed as a proportional control (P control), as a proportional-integral control (PI control) or as a proportional-integral-derivative control (PID control).

In an advantageous embodiment of the method, the intended winding tension is constant.

The intended winding voltage is preferably kept constant during battery cell production and the winding of capacitors. "Constant" is to be understood here as meaning that the winding voltage, in particular at the first support point - that is the support point of the winding material on the (in particular already wound) winding body - remains the same during the winding process.

According to the invention, as explained later, the winding tension of the winding material is set using a variable winding material storage device. The variable winding material storage device is set in such a way that the changing length between the first and second support points is compensated. The length of the winding material between the first support point and the third support point is therefore constant. Due to the constant length of the winding material between the first and third support points, the winding tension is constant.

The first support point refers to the support point of the winding material on the winding body. The second support point refers to the support point of the winding material on the deflection roller from which the winding material is wound onto the winding body. The third support point can be the support point of the winding material on the supply roller or the support point of the winding material on a deflection roller between the supply roller and the winding material storage.

The winding tension is kept constant by keeping the distance between the first and third support points constant.

Here, the distance between the first and second support point is called the free length.

For a winding body with a non-circular cross-section, the distance between the first and second support point is not constant, as it changes with the orientation of the winding body.

• die Veränderung der Kapazität des Wickelgutspeichers und darüber hinaus gegebenenfalls
• durch eine Veränderung der Position der Tänzerrolle.

The change in the distance between the first and the second support point is compensated. The compensation is carried out in particular by

• the change in the capacity of the winding material storage and, if necessary,
• by changing the position of the dancer role.

The winding tension can also be kept constant by adjusting the rotational speed of the winding body and/or the rotational speed of the supply roll. A reduction in the rotational speed of the supply roll leads to an increase in the winding tension. Furthermore, a reduction in the rotational speed of the winding body usually leads to a reduction in the winding tension.

According to the invention, the setting unit has a variable winding material storage.

Preferably, the setting unit is designed as a variable winding material storage unit. Optionally, the winding material storage unit can also include a dancer roller.

In the design, the variable winding material storage is used to adjust the winding tension. According to the invention, the winding tension of the winding material is adjusted by changing the capacity of the variable winding storage.

A number of deflection rollers are suitable as a variable winding material storage system, with the winding material meandering around the number of deflection rollers. To adjust the capacity of the winding material storage system constructed in this way, the position of one or more deflection rollers can be changed.

The change can be carried out by an actuator, whereby the actuator changes the distance between one or more deflection rollers in relation to one another.

By changing the capacity of the winding material storage, the change in the free length can be compensated. This allows the winding tension to be kept constant.

Particular attention must be paid to the position of the second support point on the pulley.

Compensating the length of the winding material with the help of a variable winding material storage is a simple and effective way to keep the winding tension of the winding material constant.

The free length is calculated based on three components:
The length of the winding material between the first and second support point is referred to as the free length. The support point of the winding material on the deflection roller is also relevant. In addition, the winding material already wound on the winding body can be taken into account. By taking the three aspects into account, the free length to be compensated can be calculated.

In a further advantageous embodiment of the method, the setting unit additionally has an adjustable winding material brake. A winding material brake is preferably designed as a deflection roller that is coupled to a servo motor, whereby the servo motor specifies the rotational speed of the deflection roller. If the rotational speed of the deflection roller is reduced, the winding tension is increased.

Optionally, the adjustment unit also includes a dancer roller.

The winding material brake can also optionally be used to adjust the winding tension. The winding material brake can be used, for example, in combination with a winding material storage unit and/or the dancer roll.

According to the invention, the winding tension is adjusted to the intended winding tension using a control device.

The control device has a control loop. The control loop is preferably designed as a P controller, PI control loop or PID control loop.

A control device with a control loop can be used to control the winding tension to a constant or to the specified winding tension.

The control device preferably controls the position of an actuator. The actuator is used to adjust the position of the dancer roll or to adjust the capacity of the winding material storage.

In a further advantageous embodiment of the method, a sensor, in particular a sensor on a dancer roll, determines the winding tension.

The sensor is preferably designed as a force sensor and/or as a position sensor. In the case of a dancer roller, a force sensor is also referred to as a tension load cell. Such a sensor provides the determined position and/or the determined force for the control device, in particular for the control circuit and/or for the control device.

The encoder can also determine the force directly through interaction of the encoder with the winding material.

In a further advantageous embodiment of the method, the setting unit sets the length of the winding material between a support point of the winding material on the supply roll and the support point of the winding material on the winding body to a constant length.

In other words, the adjustment unit compensates for the deviation in the winding tension by changing the free length and the displacement of the respective second support point of the winding material on the deflection roller. The change in the free length is calculated.

The change in free length is provided to the control device.

The free length is calculated by a continuous calculation using geometric relationships during the winding process. Calculating the free length during the winding process is called an online calculation.

The calculation of the free length is particularly advantageous because measurement errors can occur during an experimental determination.

According to the invention, the adjustment unit, in conjunction with the winding material storage, compensates for a change in a free length.

The setting unit is used to set the capacity of the winding material storage. The winding material storage has at least one deflection roller for this purpose, wherein the setting unit changes the position of the at least one deflection roller in relation to another deflection roller.

By changing the position of the deflection rollers of the winding material storage relative to each other, the capacity of the winding material storage is changed. In such a winding material storage, the winding material passes through the winding material storage, with the winding material being changed in its direction of propagation by at least one deflection roller.

According to the invention, the position of an actuator of the setting unit during winding is calculated as a parameter for the setting unit.

The free length is also a parameter. A parameter that depends on the free length and optionally on the intended winding tension is the setting for the respective actuator or another parameter for the setting unit. The parameter can also be compared with at least one measured parameter during the calculation.

The winding machine comprises a receiving device for the winding body, in particular for a winding body with a non-circular cross-section.

The winding machine is also assigned a supply roll for the winding material. The winding machine has a further receiving device for the supply roll.

The winding machine also includes a setting unit. The setting unit has a variable winding material storage unit.

In addition, the adjustment unit can be provided for adjusting the respective rotational speed of the supply roll and/or the winding body.

Optionally, a winding machine can add another dancer roll The dancer roller can be used to compensate for the winding tension and/or in conjunction with a sensor to determine the winding tension.

The winding material runs from the supply roll over the optional dancer roll and through the setting unit. After passing through the dancer roll and the setting unit, the winding material is made available to the winding body via a deflection roll.

The deflection roller in front of the winding body can be part of the adjustment unit. The deflection roller is advantageously arranged in a fixed position. The winding material runs over the deflection roller, whereby the winding material leaves the deflection roller at a second support point. The support point changes with the orientation of the winding body, especially in the case of a winding body with a non-circular cross-sectional area.

The winding machine has an optional winding material brake. The winding material brake is designed to directly adjust the winding tension to the intended winding tension.

The supply roll and the winding body are each coupled to a drive. The respective drive is used to rotate the winding body or the supply roll. The supply roll has a second rotation speed. The winding body has a first rotation speed.

The rotation speeds are controlled or regulated by the control device.

The winding tension can be adjusted or regulated using the rotation speed. A reduction in the first rotation speed, particularly in relation to the second rotation speed, usually results in a reduction in the winding tension.

Preferably, the winding tension is adjusted by controlling the respective rotation speed.

For example, an oval or rectangular cross-section of a winding body leads to a periodic change in the winding tension at a constant speed of the winding material. The winding tension depends on the free length. As the free length increases, the winding tension increases.

• die erste Drehgeschwindigkeit (des Wickelkörpers) reduziert werden,
• der Wickelgutspeicher die Kapazität reduzieren, mit Hilfe eines Stellgliedes der Einstelleinheit
  und/oder
• die zweite Drehgeschwindigkeit (der Versorgungsrolle) erhöht werden.

To reduce the winding tension,

• the first rotation speed (of the winding body) is reduced,
• the winding material storage can reduce the capacity by means of an actuator of the setting unit
  and or
• the second rotation speed (of the supply roll) can be increased.

A control device is used to adjust the winding tension using the above measures. A computing unit is assigned to the control device. The computing unit is used to calculate the respective rotational speed, to adjust the setting unit and the actuator.

In the following, the invention is described and explained in more detail with reference to figures.

FIG 1

eine Wickelmaschine,

FIG 2

eine weitere Wickelmaschine,

FIG 3

eine weitere Wickelmaschine,

FIG 4

eine weitere Wickelmaschine sowie

FIG 5

eine weitere Wickelmaschine.

Show it

FIG 1

a winding machine,

FIG 2

another winding machine,

FIG 3

another winding machine,

FIG 4

another winding machine and

FIG 5

another winding machine.

FIG 1 shows a winding machine. The winding machine has an adjustment unit EE. The adjustment unit EE can be designed as a winding material brake, as a winding material storage device 5 and/or as a dancer roller 3. A control device SE is also shown, wherein the control device SE comprises a computing unit RE and/or a control device 9. The control device SE serves to control or regulate the drive M for the winding body 1. The computing unit RE provides the intended winding tension F-soll. Preferably, the computing unit RE provides the settings for a respective actuator 3a, 5a and/or the first and second rotational speeds W1, W2. Based on the above variables, the control device SE controls or regulates the motors M of the supply roll 4 and/or the winding body 1. Optionally, the control device controls or regulates a respective actuator 3a, 5a. The winding body rotates during the winding process at a first rotational speed W1. The first rotational speed W1 corresponds to the first time derivative of the orientation a of the winding body 1. The winding body 1 is wound with the winding material D. The winding material D runs through the winding machine at a speed v. The winding material D has a winding tension F during the winding process. The winding tension F is set to a intended winding tension F_soll with the help of the drive M of the winding body 1, with the help of the drive or the motor M for the supply roll 4. The supply roller has a second rotation speed W2.

The winding material D is guided over a deflection roller 2. The winding material D is wound by the deflection roller 2 onto the winding body 1. The winding material D leaves the deflection roller 2 at a second support point P2. The winding material D touches the winding body 1 at the first support point P1. The free length x extends between the first support point P1 and the second support point P2. The free length x corresponds to the length of the winding material D between the deflection roller 2 and the winding body 1. The free length x changes periodically during the winding process. In addition, the second support point P2 on the deflection roller 2 also changes periodically.

FIG 2 shows another winding machine. The winding machine has a dancer roll 3. The dancer roll 3 serves to balance the winding tension F of the winding material D. The winding material D starts from the supply roll 4 and passes through the Dancer roll 3. The winding material D is wound onto the winding body 1 via a deflection roll 2.

A sensor and/or an actuator 3a are assigned to the dancer roller 3. The sensor determines the position d of the dancer roller 3. The sensor can also be designed as a force sensor and thus directly determine the winding tension.

Preferably, the change in the free length x is compensated with the help of the dancer roller 3, whereby the dancer roller 3 compensates for the change in the free length x, e.g. with the help of an actuator 3a. The winding tension F is set to a constant value by a constant distance between a first support point P1 and a third support point P3. The third support point P3 is the point at which the winding material D leaves the supply roller 4. The third support point P3 is preferably located on the supply roller 4. The winding tension is also constant by a constant length of the winding material between the first support point P1 and the third support point P3.

FIG 3 shows another winding machine. The winding machine comprises a winding body 1, a deflection roller 2, a dancer roller 3 and a supply roller 4. The speed of the winding material D is constant, in particular starting from the supply roller 4. In the design shown here, the winding material D runs at a constant speed v from the supply roller 4. The winding material D runs through the free length x at a non-constant speed v (v≠const). The dancer roller 3 serves to compensate for the speed v of the winding material D. The second rotational speed W2 of the supply roller 4 is constant. In particular, the second rotational speed W2 does not depend on the respective orientation a (from 0° to 360°). This means that the speed v of the winding material D, which comes from the supply roller 4, is constant.

The position d of the dancer roller 3 can be actively adjusted by means of the actuator 3a.

Furthermore, the first rotational speed W1 is not constant, but has a periodic course. This is shown in the respective diagram. The approximately periodic course of the first rotational speed W1, that is the rotational speed of the winding body 1, is calculated based on the shape of the non-circular cross section of the winding body 1. The periodic variation of the first rotational speed W1 at a constant second rotational speed W2 of the supply roll leads to the equalization of the winding tension F of the winding material D during the winding process.

Alternatively, the supply roller 4 can be driven with a periodic rotation speed W2. Then the first rotation speed W1 can be set to a constant value.

The dancer roller 3 is optionally assigned to an actuator 3a (not shown). Minimal fluctuations in the winding tension F can be compensated by the actuator 3a and the dancer roller.

A control device SE (not shown) is preferably used to control or regulate the first rotational speed W1.

FIG 4 shows another winding machine. The winding machine has a winding body 1 onto which two winding materials D are wound. The first rotational speed W1 of the winding body 1 is constant.

The winding machine has a deflection roller 2. The respective winding material D is guided onto the winding body 1 on the respective deflection roller 2.

In addition, there is a dancer roller 3 for each winding material D. The respective dancer roller 3 is A sensor for determining the respective position d of the respective dancer roller 3 is assigned. The position d of the respective dancer roller is almost constant. Optionally (not shown), the dancer roller 3 is equipped with an actuator 3a.

To compensate for the respective winding tension D of the respective winding material D, the respective second rotational speed W2 is varied. The variation of the winding tension F as a function of the orientation a of the winding body 1 (or the supply roll 4) can be set as the intended winding tension F-target.

The speed v of the respective winding material D is not constant, starting from the supply roll 4. The speed v of the respective winding material D is based on the orientation a of the winding body 1.

FIG 5 shows another winding machine. The winding machine has a winding material storage 5 and a dancer roll 3. The dancer roll 3 and/or the winding material storage 5 form the setting unit EE. The setting unit EE is used to set the winding tension F of the winding material D. The and/or connection is indicated by the dashed border of the respective elements 3, 5.

The winding machine comprises a control device SE. The control device SE has a control device 9. The control device 9 serves to regulate the capacity of the winding material storage 5. The capacity of the winding material storage 5 is set using an actuator 5a. To do this, the actuator 5a changes the position d of a deflection roller of the winding material storage 5. Furthermore, force sensors can determine the winding tension F of the winding material D.

An analogous structure of the setting unit EE can be achieved by the dancer roller 3. The dancer roller 3 can be equipped with a sensor The encoder determines the winding tension F by determining the position d of the dancer roller 3.

The winding machine also comprises a control device SE. The control device SE comprises a computing unit RE and a control device 9. The control device 9 serves to control the position of the respective actuator 5a and/or the rotational speed W1, W2.

The control device SE further has inputs for the position d of the respective dancer roller 3 and/or the capacity of the winding material storage 5.

The control device SE serves to set the winding tension to a specified winding tension F, in particular to a constant specified winding tension F-desired. The first and second rotational speeds W1, W2 are specified by the control device SE.

Preferably, the rotational speeds W1, W2 are constant and the compensation of the winding tension F is carried out by the respective actuator 5a. The actuator 5a is adjusted in such a way that the free length x is compensated by the change in the capacity of the winding material storage 5.

In summary, the invention relates to a method for winding a winding material D and a winding machine. By means of an adjustment unit EE and optionally additionally by changing the respective rotational speed W1, W2 of a winding body 1 and/or a supply roll 4, the winding tension can be set to a predetermined winding tension F_soll, in particular a constant winding tension F. A characteristic aspect is the compensation of the free length x of the winding material, wherein the free length x is the distance between the first support point P1 of the winding material on the winding body 1 and the second support point P2 of the winding material on a deflection roll 2. The change in the free length is hereby made by the adjustment unit and optionally additionally compensated by varying the respective rotational speed W1, W2. The invention allows the winding tension F to be adjusted easily, quickly and precisely when winding a winding material D onto a winding body.

Claims (9)

1. Method for coiling a coiled product (D) onto a coil body (1) having a non-circular cross section, from a supply roll (4) onto the coil body (1), said method comprising at least the following method steps:

   - providing the coiled product (D) from the supply roll (4); and

   - winding the coiled product (D) onto the coil body (1),

   - wherein a variable free length results from the non-circular cross section of the coil body per revolution of the coil body, wherein this is the variable free length of the coiled product between the bearing points of the coiled product on the coil body and a deflection roller proceeding from which the coiled product is coiled,

   - wherein the coiling tension (F) of the coiled product (D) is adjustable to an envisaged coiling tension (F-nom),

   - wherein the coiling tension (F) is set to the envisaged coiling tension (F-nom) by a regulator installation (9), characterized in that the coiling tension (F) is set to the envisaged coiling tension (F-nom) by a setting unit (EE), wherein the setting unit (EE) has a variable coiled-product accumulator (5),

   - wherein the setting unit (EE) in conjunction with the coiled-product accumulator (5) equalizes a variation in the variable free length (x) per revolution, wherein the coiling tension is actively equalized, wherein the coiled-product accumulator is set in such a manner that a capacity of the latter is set for equalizing the coiling tension,

   - wherein the alteration of the free length is calculated by a continuous calculation with the aid of geometrical correlations during the coiling procedure and provided to a control installation,

   - wherein at least one position of an actuator (3a, 5a) of the setting unit is calculated as a parameter for the setting unit (EE) when coiling, wherein a computer unit serves for calculating a respective setting, wherein the computer unit and the regulator installation are assigned to the control installation, and the control installation serves for controlling or regulating drives for rotating the coil body and the supply roll, and for controlling or regulating the actuator (3a, 5a).
2. Method according to Claim 1, wherein the envisaged coiling tension (F-nom) is constant.
3. Method according to one of the preceding claims, wherein the setting unit (EE) has an adjustable coiled-product brake.
4. Method according to one of the preceding claims, wherein an encoder, in particular an encoder on a dancer roller (3), or a transducer, determines the coiling tension (F).
5. Method according to one of the preceding claims, wherein the setting unit (EE) between a third bearing point (P3) of the coiled product (D) on the supply roll (4) and the first bearing point (P1) of the coiled product (D) on the coil body (1) sets the length of the coiled product (D) to a constant length.
6. Method according to at least Claim 1, wherein the setting of the coiling tension is performed by the rotational speed of the coil body.
7. Coiling machine, in particular for coiling wire or a foil, having

   - a receptacle device for a supply roll (4) for providing the coiled product (D),

   - a further receptacle device for a coil body (1) with a non-circular cross section,

   - a deflection roller proceeding from which the coiled product is coiled,

   - drives (M) for rotating the coil body and the supply roll,

   - a regulator installation (9) for setting the coiling tension to the envisaged coiling tension, characterized in that the coiling machine furthermore has:

   - a setting unit (EE) for setting the coiling tension to an envisaged coiling tension, wherein the setting unit (EE) has a variable coiled-product accumulator and an actuator (3a, 5a),

   - a computer unit serving for calculating the respective rotational speed, for setting the setting unit and the actuator,

   - a control installation (SE) which comprises the regulator installation (9) and the computer unit (RE), wherein the control installation (SE) with the aid of the drives (M) and the setting unit (EE) is configured to carry out a method according to one of Claims 1, 2, 5 or 6.
8. Coiling machine according to Patent Claim 7, for carrying out the method according to Claim 3,
   characterized in that the setting unit has an adjustable coiled-product brake.
9. Coiling machine according to Patent Claim 7 or 8, for carrying out the method according to Claim 4,
   having

   - an encoder which determines the coiling tension (F).

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