EP1155987A2 - Roll changer with motor brake - Google Patents

Abstract

A drive for a roll changer with at least one motor (1a, 1b) for driving the roll changer has a driving electronic unit (9). The driving electronic unit drives the motor (1a, 1b), of which there is at least one, such that the motor (1a, 1b), of which there is at least one, acts as a drive and/or as a brake. A process is provided for driving or actuating a roll changer, where at least one motor (1a, 1b) of the roll changer is actuated or driven such that it acts as a drive or as a brake.

Description

The present invention relates to a drive for a reel changer as he especially with rotary printing processes in newspaper, offset or commercial printing is used.

Reel changers are used to unwind web-like material on reels is wound up, and are mainly used in connection with rotary printing presses used such. B. in offset printing of newspapers or gravure printing of magazines, in order to feed paper webs to the printing machines, which are then in the printing machines be printed. However, the drive according to the invention can also be used with a reel changer are used in which a web of material made of a material other than paper to be processed. In the following, however, the invention is exemplified on the basis of a Roll changer for a printing machine described. The term used here "Reel changer" includes any driven device for unwinding a web of material, without, however, a specific change of the web in the company or a change such changing device must be provided at all.

A printing press should be as continuous as possible during printing a paper web, preferably with a predetermined paper speed and Web tension, are supplied. For this it is necessary that paper webs from the respective paper rolls are regulated and unrolled as evenly as possible, taking it It is desirable that a completely unrolled, i.e. empty, paper roll runs in full automatically replaced by a full roll, i.e. can be changed. Doing so usually the paper web of the unrolled roll during printing the paper web of the full roll glued, preferably one transverse to the conveying direction running adhesive tape is to be applied.

From DE 44 37 147 C1 is a winding reel changer of a rotary printing press known, a drive and a disc brake as a separate braking device is provided, which transmit a torque via a clutch. This is the same Axial misalignment.

It is the object of the present invention a drive for a reel changer, as well propose a method for driving a reel changer, which a enable economical operation of a reel changer.

This object is achieved by a drive with the features of claim 1, and a Method with the features of claim 12 solved.

Advantageous embodiments result from the subclaims.

The drive according to the invention for a reel changer has at least one motor Driving the reel changer, especially the central axis or the core of the roll of paper to be rolled up, with control electronics provided for this motor is, so that the motor can be driven on the one hand, as z. B. when accelerating or synchronization or unrolling of the paper roll is required. On the other hand can be controlled via the control electronics of the motor so that this motor as Generator is operated, ie releases energy, which generates a braking effect can. The electrical energy generated from the rotational energy can, for. B. be fed back into an electrical network.

Furthermore, it is also possible to use the engine e.g. B. by suitable phase shift to control the supplied voltages so that the electric motor generates a braking force, which goes beyond the braking force in simple generator operation. An electric motor can thus be actively operated as a brake by supplying energy, the strength of the Braking force z. B. can be set via the angle of the phase shift. Under the term phase shift is understood to mean that angle which is at a Three-phase or alternating current motor lies between the voltage signal or signals, which would have to be applied to keep the electric motor in sync with the current one Drive speed and the applied drive or Control signals that are to generate the desired braking effect. Simplified in other words, an electric motor connected to a rotating axis should be controlled in this way that he has a braking force directed in the opposite direction of the axis of rotation generated. However, the voltages applied to the electric motor should not be pure Sinusoidal vibrations are limited, but can use other suitable signal forms have such. B. cut off segments of a full sine wave, as z. B. is known in a phase control.

Such control electronics for a motor can therefore be regulated Accelerate and roll, as well as easy braking, as well as a quick stop effect the role using a simple motor, the motor depending on Desired operating mode as a simple electric motor for accelerating or driving, as Generator or operated as an active brake. It is therefore possible to use a reel changer to be braked exclusively via one or more motors, with no additional Auxiliary brakes must be provided even when the reel changer is full Paper roll must be stopped quickly. Since there is a If the engine heats up, active cooling is desirable or passive cooling elements, such as. B. provide cooling fins or the like on the engine.

Depending on the desired performance, it can happen that the drive or motor of the reel changer in terms of torque and performance is greater than that of one Reel changer must be designed with additional braking elements, which in particular due to the engine load when braking full paper rolls during a quick stop is. However, since this design of the engine eliminates the need for auxiliary brakes overall, the reel changers can be constructed more cost-effectively. It is advantageous in particular that by the arrangement described above control and Control functions of a role changer can be simplified because the coordination of Drive and braking processes are easy to miss. It must e.g. B. no longer on it be made sure that the drive of a motor is safely switched off when a brake is operated because the drive and brakes are carried out by the same motor. Farther the important advantage for running operating costs is that braking can be carried out without wear, which, for. B. when using mechanical Auxiliary brakes are not the case.

The motor is advantageously provided as the center drive of the paper roll, so that Torque or the driving force of the engine z. B. on clamping pin on the core of a Paper roll works. In contrast to a peripheral drive, such a center drive has where a roll of paper is driven by belts on your circumference, the advantage that due to the beltless drive to be attached in the transverse direction of a paper web Adhesive strips for connecting two paper webs can be applied relatively easily. The work involved in preparing the gluing points and gluing the paper rolls can thus be reduced by a center drive, so that when changing roles Glue the paper web of a new roll onto the paper web of an old roll by the free one Drive system easily unlocked access to the entire paper web can be. In general, it is advantageous to use a reel changer To drive the center drive, whereby it is not absolutely necessary to use a motor with the provide functionality described above. With a center drive, both a motor can be provided which does not require additional auxiliary brakes, since this Motor generates sufficient braking force. But it is also possible to drive one provide known engine with additional auxiliary brakes. Such a center drive can be with or without each individual or a combination of several elements of the Drive described here can be used for a reel changer without inevitably use the specifically described engine functionality. However, the present invention should not be limited to a center drive, but also others Drive types, such as B. include the peripheral drive described.

At least two motors for driving or braking the are particularly advantageous Roll changer provided, it is also conceivable three, four or depending on Possible application to provide a larger number of motors. The are preferred Motors on both sides of the roll connected to the roll core by means of clamping pins, see above that the roller can be driven from both sides. On each side of the roll core is in such an arrangement, in comparison to a one-sided center drive, only still half the torque is effective, reducing the mechanical load on the roll core is significantly reduced during acceleration or braking. It is beneficial Use motors of the same design.

If several motors are used, the control can be based on the desired one Operating mode of the roll changer take place so that, for. B. in a simple braking process all motors are operated as generators. To create a stronger braking effect can e.g. B. one or more motors are actively braked, i.e. these engines electrical signals are supplied so that they counteract the direction of rotation Generate braking force. At least one motor can still be in the Generator operation run, so that the energy obtained from this engine z. B. over a Inverter is fed into the actively braking motor or motors. To generate a even stronger braking can then z. B. all the envisaged motors by feeding suitable electrical signals are actively braked. It is Z. B. possible on each side to provide two motors, one motor as a generator during a braking operation is operated and generates the energy required to actively brake the other motor.

The or the motors used three-phase asynchronous motors is advantageous, wherein in general, other types of engine can be used, such as. B. General Three-phase or AC motors, universal motors or DC motors.

If several motors are used, common control electronics are advantageous provided so that the respective motors are simply matched with the same Speed and the same torque can be controlled to accelerate or apply braking force to the paper roll arranged in the roll changer. In particular, it is advantageous to have a common drive controller and a common one To provide power level for the respective motors, the motors then parallel or can be connected in series to the power level. This can also be simple This ensures that the motors, which are preferably identical, are always parallel and act equally accelerating or braking on the paper roll, so that a Working together against the motors over the roller core can be avoided. Should he Drive are designed so that at least one motor as a generator at the same time is operated, at least one other motor by applying suitable Voltage signals are operated so that it generates an active braking effect, so at Using a plurality of motors e.g. B. common drive controller or Power levels for the engines working in generator operation on the one hand and the active braking engines are provided on the other hand.

The control electronics are preferably designed so that different Drive characteristics of the motors used, which z. B. from identical engines Manufacturing tolerances can result, entered as parameters or as motor models are mapped so that the control electronics torque differences, which at Can prevent the use of the same signals for different motors. So z. B. a correction algorithm for one or more of the motors or drives be provided which compensates for the differences in performance of the respective drives, that at least one of the motors or drives is supplied with control signals which with compensating control variables, such as B. a correction current or Correction voltage, applied or superimposed.

Suitable sensors on the motors or the paper webs and are preferred Control elements are provided in the control electronics, so that the output signals for Actuation of the motor of one or more of the target and / or actual values of certain Parameters such as B. the paper web speed, for example measured on the circumference the paper roll, the web tension, the roller position of a pendulum roller or the like depend.

The control electronics advantageously control the motor (s) in such a way that they are dependent of measured input signals the unwinding speed of the paper web at the circumference of the Paper roll is regulated, e.g. B. equal to the paper speed of the printing press is held. An additionally provided pendulum roller is preferably used in one held certain position.

The control electronics can advantageously implement a control which, for. B. from a upstream control function for the position of the pendulum roller and a downstream one Control function exists for the desired paper speed, whereby to control the Pendulum roller position the difference between the setpoint and actual value of the pendulum roller position is determined and a speed correction value is generated based thereon. This The speed correction value is then measured with the Paper web speed of the printing machine is summed, this sum being the target value of the cruise control function. This cruise control function further takes into account the difference between the sum formed and the actual value of the Unwind speed of the paper web on the circumference of the paper roll and generates one Control value, which is used to control the motors, e.g. B. the Drives frequency converter of the control electronics.

The control electronics are preferably designed such that they have a drive controller and a drive controller Power level with a supply or supply unit and a frequency converter having. The power level advantageously contains a regenerative one Supply unit, which is a braking energy generated by a motor during braking can feed back into an electrical network.

Depending on the desired application of the drive for the reel changer, it can be advantageous be the individual motors in parallel at the output of the control electronics, for. B. on Connect frequency converter, each of the motors then always with the same voltage can be operated and with the same design of the motors the same fraction of the total current of the frequency converter.

Alternatively, the motors can also be connected in series at the output of the control electronics or Frequency converter can be connected, so that always the same current through the motors flows, whereby the voltage of the frequency converter is applied to the motors proportionally, so that e.g. B. in four motors of the same type used a quarter of the voltage of the Frequency converter on a single motor.

In general, it is advantageous as control functions provided in the control electronics Realize programs that z. B. cyclically on digital controllers or computing systems can be executed. There are other ways to implement the Control functions possible, such as B. analog circuits or the like.

The invention further relates to a method for driving a reel changer, whereby at least one motor of the reel changer is controlled so that it depends on Desired mode of operation as a drive motor, as a generator for easy braking or as active brake can be operated, suitable in the latter operating mode Voltage signals are supplied which have a relatively large active counterforce against one can generate momentary rotary motion. For this purpose, e.g. B., as stated above, suitable phase-shifted AC signals are used. The will be advantageous Motor driven so that to accelerate the motor, which requires greater force it is necessary to apply different control signals than when the motor is running in sync continuous printing. So z. B. the amplitude of the applied voltages in the Acceleration phase are increased, which gradually increases during startup smaller dimension is returned.

Figur 1

eine schematische Draufsicht auf einen Rollenwechsler,

Figur 2

eine Seitenansicht eines Rollenwechslers,

Figur 3

ein Blockschaltbild der Ansteuerelektronik eines Rollenwechslers mit zwei damit verschalteten Motoren, und

Figur 4

ein Blockschaltbild einer Regelung eines Elektromotors.

The invention will be described below on the basis of preferred embodiments. Show it:

Figure 1

a schematic plan view of a reel changer,

Figure 2

a side view of a reel changer,

Figure 3

a block diagram of the control electronics of a reel changer with two motors connected to it, and

Figure 4

a block diagram of a control of an electric motor.

Figure 1 shows a top view of a reel changer with the core of the paper reel on both sides provided clamping pin 2, which is provided by the electric motors on each side 1a and 1b are driven as a center drive so as to drive a torque or braking to transfer to the paper roll 3, which as a continuous paper web 4 in Printing operation is handled. To regulate or control the desired A tension roller 19 is provided, the function of which is illustrated in FIG. 2 is described in more detail.

FIG. 2 shows a reel changer which, unlike that shown in FIG. 1, is not directly from axially acting on the core 18 of the paper roll 3 electric motors, but one laterally to the paper roll 3 offset motor is driven. The from the paper roll 3 continuously Unrolled paper web 4 becomes a pendulum roller 9 via a first stationary roller 20a and guided by this over a second stationary roller 20b. Like the one at Pendulum roller 19 indicate upward and downward arrows, the pendulum roller 19 to be actively moved up or down depending on a particular given control algorithm the voltage or speed of the guided To influence paper web 4. It is also possible that the pendulum roller 19 only due to their own weight or via a spring mechanism onto the paper web 4 acts to ensure a desired web tension or web speed.

FIG. 3 shows a block diagram of control electronics 9 which have a drive controller 5 in which certain signals recorded by sensors of different actual values can be entered, such as B. the actual values of paper speed, web tension or the pendulum roller position. Furthermore, a control or is in the drive controller 5 Control algorithm is provided so that the drive controller 5 based on its entered control algorithms and input signals the power level 8 so controls that the electric motors 1a and 1b connected to the power stage 8 in the desired operating mode can be controlled, such as. B. for accelerating or braking a roll of paper. The power level 8 is made up of a feed unit 7, which Energy z. B. is supplied from a power grid. At this feed unit 7 is a Frequency converter 6 connected, which the primary energy supplied from z. B. the Power supply in suitable control or drive signals for the connected Converts electric motors 1a and 1b. If the motors 1a, 1b in generator operation operated, the feed unit 7 can feed the energy back into the network.

FIG. 4 shows a control system which has a manipulated variable 17 for the one shown in FIG Frequency converter 6 generated. The input signal of the pendulum roller control 12 is the Difference formed from the target value 10 and the actual value 11 of the pendulum roller position. The Pendulum roller control 12 generates a speed correction value as an output signal 13, to which the setpoint value of the paper speed of a printing press is added. From the sum of the signals 13 and 15, the actual value 14 of the paper speed becomes fed paper web, which is preferably on the circumference of the paper roll 3rd is measured. The difference thus formed is the cruise control 16 as Input signal supplied, the desired using an algorithm Control variable 17 is generated for the frequency converter.

Claims (16)

Drive for a reel changer with at least one motor (1a, 1b) for driving the reel changer and at least one control electronics (9), which the controls at least one motor (1a, 1b) so that the at least one motor (1a, 1b) acts as a drive and / or as a brake. Drive for a reel changer according to claim 1, wherein the at least one motor (1a, 1b) is provided as a center drive. Drive according to claim 1 or 2, wherein at least two motors (1a, 1b) are provided which are arranged in particular on different sides of the reel changer are. Drive for a reel changer according to one of the preceding claims, wherein the at least one motor (1a, 1b) is a three-phase asynchronous motor. Drive for a reel changer according to one of claims 3 or 4, wherein the at least two motors (1a, 1b) via common control electronics (9) can be controlled. Drive for a reel changer according to one of the preceding claims, wherein the control electronics (9) the characteristics of the motors used (1a, 1b) taken into account or compensated. Drive for a reel changer according to one of the preceding claims, wherein the control electronics (9) the target and / or actual values of the paper speed, Web tension or pendulum roller position to generate the control signals for the at least one motor (1a, 1b) is taken into account. Drive for a reel changer according to one of the preceding claims, wherein the control electronics (9) a drive controller (5) and a power stage (8) consisting of a feed or supply unit (7) and a Frequency converter (6). Drive for a reel changer according to claim 8, wherein the power stage (8) a Has regenerative feed unit (7), which during braking operation to the Frequency converter (6) connected motors (1a, 1b) return electrical energy can feed into an electrical network or an accumulator. Drive for a reel changer according to one of claims 3 to 9, wherein the at the Control electronics (9) connected motors (1a, 1b) in parallel at the output of the Control electronics (9) are connected. Drive for a reel changer according to one of claims 3 to 9, wherein the at the Control electronics (9) connected motors (1a, 1b) are connected in series. Method for driving or controlling a reel changer, at least a motor (1a, 1b) of the reel changer is driven so that it can act as a drive or brake. The method of claim 12, wherein the at least one motor (1a, 1b) in Braking operation is controlled with voltage signals, so that the motor (1a, 1b) due to these voltage signals a counterforce to a predetermined one Rotary motion generated. The method of claim 12, wherein the at least one motor (1a, 1b) in Brake operation is operated as a generator. Method according to one of claims 12 to 14, wherein the motor characteristic in the Control of the motor is taken into account. Method according to one of claims 12 to 15, wherein from the difference between Setpoint and actual value of the pendulum roller position is a speed correction value is formed, which with the actual value of the paper speed one Printing machine is added, with the actual value of the total of this sum Paper speed of the paper roll (3) is subtracted and from this difference a control variable for the at least one electric motor (1a, 1b) is formed.

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