EP1785377B1 - Roll changer with draw-in device - Google Patents

Description

The invention relates to a roll changer with retractable work according to the preamble of claim 1.

By the EP 09 76 674 A1 is a retraction with a speed-controlled tension roller with superposed web tension control known.

From the DE 100 27 471 A1 For the operation of a web-fed rotary printing press, it is known to set a desired web tension profile or level over the web length, in particular by means of an infeed mechanism.

The DE 100 14 535 A1 discloses a method for operating a web-fed rotary printing press, wherein train units located in the path path for the operating states pressure-off and pressure-on are given different advance values. It is further stated that when switching on the web tension will break - regardless of the fact that - as before - when turning on the pressure of the first tractor unit before the printing unit increases the web tension. It is further proposed now to adjust by a "slow" Bahnzugkraftregelung at constant machine speed overruns of train units.

The JP 55021226 A shows an automatic control system of an offset machine, wherein the startup of the machine, an interruption of the further acceleration and a "checkup" of the paper takes place before the machine is further accelerated. When the machine is shut down, it will turn off after a certain speed has been reached.

The DE 102 25 824 A1 discloses a method for determining a trace for the web tension drop of a web by a print on job which is run before the actual production run. On the track between a reel changer and a train group, the printing press on an infeed.

By the US 2003/188661 A1 a method for controlling the web tension is known, wherein a distance of the co-operating over the web printing cylinder is changed in order to change the transport behavior and thus the web tension.

By the US 2005/0103818 A1 a method for web tension control is known in which in advance or simultaneously with the occurrence of a foreseeable disorder, for. B. a flying reel change, a web tension setpoint is changed at least temporarily.

The EP 1 332 995 A relates to an automatic web connection system of a machine for the production of cigarettes. In addition to a two-roll paper roll carrier, the system has a variety of feed and guide rollers and buffer chambers.

The EP 1 223 134 A2 discloses a roll changer having a dancer roller which applies a path of substantially constant force to produce a constant web tension. The web is then passed over other draw rollers and guide rollers in the direction of printing units.

The invention has for its object to provide a reel changer with retraction.

The object is achieved by the features of claim 1.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below.

Fig. 1

eine Prinzipskizze eines Teils einer Rollenrotationsdruckmaschine;

Fig. 2

eine 3D-Ansicht eines Rollenwechslers mit integriertem Einzugwerk;

Fig. 3

eine mechanisch-elektrische Prinzipskizze eines Einzugwerkes;

Fig. 4

ein Regelprinzip;

Fig. 5

eine 3D-Darstellung eines Einzugwerkes;

Fig. 6

eine schematische Darstellung für den gewünschten Verlauf einer durch das Einzugwerk eingestellten Bahnspannung in Korrelation zu einem Maschinenlauf.

Show it:

Fig. 1

a schematic diagram of a part of a web-fed rotary printing press;

Fig. 2

a 3D view of a roll changer with integrated feed mechanism;

Fig. 3

a mechanical-electrical schematic diagram of an intake train;

Fig. 4

a rule principle;

Fig. 5

a 3D representation of a feeder;

Fig. 6

a schematic representation of the desired course of a set by the infeed web tension in correlation to a machine run.

A printing machine, in particular a web-fed rotary printing press, has a roll changer 01, from which a web 02, for. B. material or paper web is unrolled, is guided by a retraction 03 and one or more downstream printing units 04, and then after printing directly or possibly a superstructure 06 with turner bars 07 and / or other web guiding devices of a finishing stage, eg. B. a former assembly 08 and / or a folder 09, is supplied.

Like among others from the DE 100 27 471 A1 For trouble-free operation, compliance with certain levels of web tension is required, with a base level for the web tension being determined by the infeed 03. For an undisturbed unwinding of the web 02 z. B. advantageously be provided by a roll changer 01 associated dancer 15, which provides a basic tension between the roll and retraction 03. For this purpose, the dancer device 15 has, for example, a movable, in particular a pivotally mounted roller, which is looped around by the web 02 and which can be acted upon with a defined force in the direction of movement.

The retraction unit 03 now defines the web tension S1 between retraction unit 03 and the first printing location (eg first printing group 04) for operation, but also determines the entire level up to the folder 09. The web tension S2 in the superstructure 06 should i.d.R. be lower than the web tension S1 before the printing units 04. When parked pressure points or printing units 04 corresponds to the web tension S2 behind the last printing unit 04 substantially the web tension S2. For employed pressure points, d. H. it is brought color and possibly water to the web 02, the web tension drops due to the changed stress-strain characteristic on the way through the printing units 04 from.

Fig. 2 shows an advantageous embodiment of the roll changer 01 with structurally integrated retraction 03.

The reel changer 01 or its frame has both the dancer device 15 and the advantageous manner web tension-controllable retraction 03. In this way, procedurally considered provided for very short tracks and structurally a space-saving and cost-effective solution, especially in connection with the procedure described below, found.

Fig. 3 shows a mechanical-electrical schematic diagram of an advantageous embodiment a zugwalzenbasiertem retraction unit 03, in particular a web tension-controlled retraction 03, wherein z. B. a speed control of a traction roller 12 driving drive motor 13 is superimposed on a web tension control.

From one in Fig. 3 not shown control means 05, z. B. Machine control 05 (see Fig. 1 ) and / or a virtual master axis, not shown, a control device 14, z. As a controller 14, a current machine speed (speed) n representing signal is provided. The controller 14 forms together with the speed and / or rotational position of the drive motor 13 or the tension roller 12 detecting sensor, for. B. Rotary encoder 16, and the drive motor 13 a loop with respect. A speed. In the controller 14, the machine speed representing signal is changed depending on the superposed web tension control loop, z. B. acted upon by a factor. A Bahnspannungsistwert on the. With reference to the draw roller 12 downstream track path, for example, by a measuring device 17, z. B. by a looped by the web 02 measuring roller 17, provided, and compared with a web tension setpoint S _soll , which either manually or preferably by a in Fig. 3 unillustrated web tension control and / or control system 10 ( Fig. 1 ) provided. The web tension control system 10 can in particular as in the WO 2004031059 A2 and or EP 08 37 825 A2 be executed explained, which is expressly referred to here. When using fuzzy logic described there, the setpoint specifications or criteria described below are not discrete.

To avoid slippage between tension roller 12 and web 02, one or more pressure rollers 18 are a pressing device -. B. pneumatically - adjustable.

Fig. 4 shows an advantageous control principle, wherein the value of the current or (target) machine speed n is given by the machine controller 05 and the master shaft or guide shaft, taking into account the diameter of the tension roller 12, a desired value the tension roller 12 is determined for synchronous operation, with a resulting from the superposed web tension control factor for forming the target value for the drive motor 13 is applied, which is then fed to the control circuit for compliance with this setpoint. The factor is formed by comparison between the web tension setpoint S _soll and the measured actual value S.

Fig. 5 shows a 3D representation of an advantageous embodiment of the feed unit 03 with the drive motor 13, the tension roller 12, the pressure rollers 18 (trolly) and a coupling 19 between the drive motor 13 and tension roller 12th

For correct determination of measured by the measuring roller 17 web tension S1 is as an internal arithmetic z. B. the web width of the currently retracted web 02 and a normalization between the physically measured parameter (eg, an electrical voltage and a resultant force and / or mechanical stress), which can be entered, for example in the controller and, at least the web width, on a display, z. B. the control room, is / are visualizable. As additional inputs into the mechanical-electrical system ( Fig. 3 For example, the trolley control (on / off) and / or the engine speed and / or a (required and / or current) overfeed of the draw roller peripheral speed with respect to the engine speed are considered or taken into account. At an input device optionally with a visualization device (eg a control station), target specifications for the web tension S1 after the infeed 03 and / or actual values for the web width and / or set values for a lag by the operating personnel can be entered in an advantageous embodiment.

As already stated above, the web tension falls at employees pressure points when color and possibly water is placed on the web 02, due to the changed stress-strain characteristic on the way through the printing units 04, so that in the superstructure 06 a (desirably) reduced web tension S2 prevails. in the Advantageous method for web tension control described below, this fact is taken into account in particular when starting and / or shutting down the machine.

Fig. 6 shows schematically plotted against time the time course of a machine speed or machine speed (dash-dotted lines). Here, for example, after a retraction of the web 02, whose beginning is marked here with EZ, a startup of the machine. In contrast to the simplified representation of the. Between low machine speed feeding and the start-up or start-up of the machine Fig. 6 as well as a standstill of the machine again.

It is essential, however, that when starting the machine after retraction of the web 02, the web tension S1 between retraction 03 and first printing unit 04 is not equal to a required for printing web tension value F _EZW , operation is regulated, but depending on the operating position or the operating state of the pressure points or printing units 04 is reduced to a reduced web tension value F _EZW , reduced down. This can be specified directly as a predefinable setpoint, or else a difference value can be specified for the later web tension value.

When driving (in particular when starting / stopping) of the machine are therefore correlated to the operating position / operating state of the subsequent printing units different setpoints as web tension values F _EZW , operation, F _EZW , reduced specified. That is, correlated to pressure on-set, the setpoint value for the web tension S1 is changed from a lower web tension value F _EZW reduced to a higher web tension value F _EZW operation. Correlated to the print-off position, the desired value for the web tension S1 from a higher web tension value F _EZW, operation changed, reduced to a lower web tension value F _EZW.

If all pressure points are still turned off, the web tension is regulated when approaching the lower web tension value F _EZW , reduced and regulated immediately before, during or after the pressure on signal to the higher F _EZW , _Betreib . The same happens when the machine shuts down in conjunction with a pressure-off signal.

In addition, during retraction (eg, with a reduced web tension F _RW , reduced) and / or in a phase at the start of the startup of the machine (eg, with a reduced web tension F _RW , reduced) may be provided after retraction in that the web tension S1 is predetermined only by the roll changer and the trolleys 18 of the infeed 03 are still turned off. The tension roller 12 can be operated, for example, synchronously with machine speed, without their superimposed web tension control is active. Thus, in an advantageous mode of operation when starting the machine, the web tension control on the infeed mechanism is activated only after reaching the operating path tension F _{RW of} the reel splitter 01. As a result, a calmer web tension structure, in particular between reel changer 01 and first printing unit 04, is achieved.

As in Fig. 6 shown, for example, after a standstill or after retraction with reduced specification of the web tension on reel changer 01 by a signal "faster" the setpoint input for the operating track voltage F _{RW of} the reel splitter 01 is activated, eg. B. by switching from F _RW reduced to F _RW , and only after reaching the desired operational track voltage F _RW downstream of the roll changer 01 or after elapse of a predetermined time x at time tx ( Fig. 6 ) the web tension control of the infeed 03 is activated. In this case, a reduced default value for the web tension F _EZW , is then reduced at still parked printing units 04 and reduced given employed printing units of the operational default value for the web tension F _EZW .

The web tension on the roll changer 01 or on the web path between reel changer 01 and retraction 03 is z. B. by the above dancer 15 according to the respective default value (F _RW , F _RW reduced). After activation of the web tension control of the infeed unit 03, the web tension S1 between infeed unit 03 and first printing unit 04 is adjusted by the infeed unit 03 in accordance with the respective default value (F _EZW , F _EZW ).

The information about the operating state or the change of the operating state of pressure-Ab in pressure-on or vice versa obtained the intake mechanism or its controller 14 z. B. from the parent control means 05.

Corresponding or similar to WO 2004031059 A2 the regulation of the infeed with the setpoint specification can be formed as part of a Bahnspannungssteuerungs- and / or -regelsystem 10, which additionally controls the web tension S2 in the superstructure 06 by not only the infeed 03, but also on the last printing unit 04 downstream draw roller 21 and / or a tensioning roller of the former assembly 08 upstream draw roller 22 acts ( Fig. 1 shown in dashed lines).

LIST OF REFERENCE NUMBERS

01

reelstands

02

train

03

infeed

04

printing unit

05

Control means, machine control

06

superstructure

07

turning bar

08

Falztrichteraufbau

09

folding

10

Web tension control and / or control system

11

-

12

pulling roller

13

drive motor

14

Control device, controller

15

dancer device

16

encoders

17

measuring roll

18

capstan

19

clutch

20

-

21

pulling roller

22

pulling roller

EZ

Beginning (02)

S

actual value

S _should

Web tension setpoint

S1

web tension

S2

web tension

n

Machine speed

F _{EZW, operation}

Web tension value

F _{EZW, reduced}

Web tension value

F _RW

Web tension value

F _{RW, reduced}

Web tension value

Claims (8)

1. Reel changer of a web-fed rotary printing press having a compensating device (15), characterized in that both the compensating device (15) ensuring a basic tension during unwinding and a draw-in unit (03) capable of web tension regulation are arranged on the frame of the reel changer (01).
2. Reel changer according to Claim 1, characterized in that the draw-in unit (03) is arranged in an upper region of the reel changer (01), between the frame walls thereof.
3. Reel changer according to Claim 1, characterized in that the draw-in unit (03) is arranged in the web path between the reel changer (01) and a first printing unit (04) and has a regulating device (14) and a draw roller (12), in that different setpoint values can be specified as web tension values (F_{EZW, operation}, F_{EZw, reduced}) to the regulating device (14) by a control means (05) for different operating states of one or more downstream printing units (04), in that an actual web tension value of the web path downstream with respect to the draw roller (12) is fed to the regulating device (14), and in that a signal representing the machine speed is fed to the regulator (14).
4. Reel changer according to Claim 3, characterized in that the draw-in unit (03) is formed with a speed-regulated draw roller (12) with superposed web tension regulation.
5. Reel changer according to Claim 3, characterized in that the different setpoint values (F_{EZW, operation}, F_{EZw, reduced}) are stored in the regulating device (14) or in the superior control means (05).
6. Reel changer according to Claim 5, characterized in that the stored setpoint values can be changed.
7. Printing press comprising offset printing units for newspaper printing, characterized in that it comprises a reel changer according to Claim 3.
8. Printing press, in which a plurality of printing units (04) are arranged stacked one on top of the other and the web runs substantially vertically through the printing units (04), characterized in that it comprises a reel changer according to Claim 3.

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