DE102004006232B3 - Drawing-in process for a web in printing press has second motor controlled on basis of preset torque - Google Patents

Abstract

The drawing in process for a printing press (01) has the drawing-in device (06) to which the web can be attached with a motor (11) to drive it to the receiving region, and a motor (21) to drive it to the issuing region. During drawing in, the first motor is controlled to a preset speed (v soll). The second motor is controlled on the basis of a preset torque.

Description

The The invention relates to a method and apparatus for feeding a material web according to the preamble the claims 1 or 17

such Devices are used in printing machines to start the web the material web along the desired Durchzufweges durchzufördern by the printing press. This is for example when moving in for a new production, or whenever required during the printing process a material web is demolished, so that the web start of the new Material web not pulled through a flying role change can be. Furthermore can in modern printing presses the printing units along different conveying paths be driven through to correspondingly different printing results to be able to achieve so when upgrading pulled the new material web along the corresponding Einziehweges must become.

From the DE 94 15 859 U1 a device for drawing a web into a treatment station is known in which the ribbon-shaped catch means can be rewound from a winding roll at the inlet of the treatment station on a winding roll at the outlet of the treatment station. The two winding rollers each have a drive in one embodiment.

Also the DE 197 24 123 A1 shows in one embodiment, a finite catchment means, which can be rewound between two each driven bobbins.

From the DE 22 41 127 A a device for drawing webs of material in rotary printing machines is known in which the trained in the manner of a spring steel strip catching means along different Einziehwege between which can be switched by means of switches, can be pushed from the outlet of the printing machine ago. The drive of the retraction means is effected by a stationary arranged drive wheel, which comes form-fitting engagement on the retraction means and pushes the retraction means along its entire length through the printing press.

The EP 04 18 903 A2 discloses a device for drawing in a material web, wherein a pulling-in means is driven by a motor which is regulated as a function of measured data determined during the pulling-in process. The regulation takes place with regard to a constant retraction speed or speed.

By the DE 94 09 390 U1 discloses a device for retraction of a material web, wherein a pulling-in means is driven by a stepper motor. A already traveled by the collection means transport path is detected by sensors.

Out WO 02/090 650 A2 are devices for drawing in a material web known, wherein a finite collection means by means of a drive in Area of a delivery area for the web is driven. In a first variant of this drive with respect to a Speed - if necessary correlates with an independent driven unit of the machine, and in the second variant with respect to a Torque regulated.

Of the Invention is based on the object, a method and an apparatus to create a web of material, in which the feeding despite high pull-in speed very material-friendly.

The The object is achieved by the Features of the claims 1 or 17 solved.

One Advantage of the invention is in particular that a faster and safe starting of the machine after retraction can. The retraction takes place here despite the possibility of high retraction speeds at the same time very gentle on materials.

The Pull-in means can in principle be infinite, d. H. as closed band-shaped Material, executed be over a driven roller in the region of an initial of the Einziehweges and a roller in the region of one end of the Einziehweges conveyed is.

Preferably However, the catchment agent is finally executed, with its ends each on a bobbin arranged and can from a bobbin in the area of a beginning the Einziehweges on a bobbin in the region of the end of the Recoil be rewound and vice versa. However, it remains always both ends with the respective bobbin in conjunction.

To a preferred embodiment takes place the drive of the catcher by driving a bobbin in each case Area of retraction start and end. These drives are advantageous for winding or unwinding the catcher in two directions of rotation drivable.

To drive the lying at least at the end of the retraction path bobbin is a re gelbarer electric motor used, so that the bobbin can be controlled with different rotational speeds and / or torques driven. Preferably, the drives of both bobbins are designed to be controllable with respect to the rotational speed and / or the applied torque. By appropriate measurement of the feed rate of the catching means by means of measuring points or by detecting the unwound or wound angle on the bobbin, the feed can be determined and regulated by controlling the electric motor, a constant conveying speed at the feed means. By determining the applied torque (eg electrical power), the applied torque can be determined and a specific torque can be set or a maximum torque can be monitored. Depending on the requirement, the respective electric motor is accordingly controlled with respect to a speed (eg frequency) or a torque (power).

From particular advantage is an embodiment, wherein when retracting the drive in the region of the end of Einziehweges (eg in the superstructure area) or speed-controlled, while the drive in the range the beginning of the pull-in path (eg in the area reel changer) with respect to a moment, for B. a constant retention torque operated becomes. In this way, a uniform feeding is possible and ensures a certain tension of the web during the Einziehvorgangs. By this procedure (regulation with respect to the speed and with respect to the moment) is avoided by a too low voltage so-called sacks can arise in the railway and / or a dancer roll arranged in the web path with one too strong deviating web tension is applied. In the latter case would be at Starting the machine, for example, extremely high deviations from setpoints and thus high rashes follow the control systems. "Wrong" web tension (to high or by bagging too low) in the start-up phase could then easily lead to web breaks, but at least too much unnecessary start-up waste.

In Continuing education is such a procedure and device in operative connection to a machine control and / or one for operation provided web tension control. D. h., It can already by correct retraction of the web i. V. m. a basic setting for the the web tension influencing aggregates -. B. dancer rolls - a ready machine be created.

to Measurement of the conveying speed In principle, a large number of sensors are conceivable for the pull-in means. A particularly simple design results when the effective scope the bobbin, with which the catcher is unwound and the rotational speed of the bobbin measured or given as a curve. With effective scope of bobbin This is understood to mean the value resulting from the circumference of the bobbin itself and the extent of the still wound layers of the catcher results. By evaluating these two readings can be in easier Way the linearly directed feed path and depending from the time the linearly directed feed rate of the catcher determined and subsequently by appropriate control of the rotational speed of the bobbin on a Setpoint to be regulated. Also a corresponding, in the software dependency deposited as a control curve the target speed of the number of turns made is conceivable.

One embodiment The invention is illustrated in the drawing and will be described below described in more detail.

It shows a printing machine with a device for drawing a Material web in a schematic represented cross section.

In a web and / or web-processing machine 01 , z. B. a printing press 01 , for the treatment of a web or material web, z. As for printing a paper web, is for the purpose of retracting a beginning of the web in the machine 01 a device for drawing provided, by means of which a beginning of the web from a beginning of the Einziehweges is conveyed to one end of the Einziehweges. Possibly. A manual way can continue through the machine before or after this machine feed path.

The printing machine shown only schematically in the drawing 01 exemplifies as a printing unit 02 trained aggregate 02 , here with two double-printing units or four printing units, as well as a reel changer 03 trained aggregate 03 and former 04 on. At the former 04 joins as a folder 05 trained, the train processing aggregate 05 at. In operation, the web, not shown, runs off the reel changer 03 by one or more pressure units 02 , if necessary, via a superstructure, not shown, with a longitudinal cutting device and a turning deck over the former 04 , For machine retraction of the web on at least a portion of such a path, a device for drawing in the material web is provided.

The device comprises in an advantageous first embodiment in a front region of the machine, in which a train to be recovered with a catchment agent 06 is connectable - in the following recording area - and in a rear area, in which the retracted web of catchment means 06 is dissolved - in the following delivery area - each a bobbin 07 ; 08 on, on which the catchment agent 06 aufwickelbar or unwindable from this.

In one embodiment, not shown, the catchment means 06 endless, ie as a loop, executed, which instead of bobbins 07 ; 08 to be wound in the receiving and dispensing area a transport roller or roller rotates. These transport rollers are preferably in the manner of the spool described in more detail below 07 ; 08 driven by speed or torque. To reduce slippage, for example, they can cooperate with pressure rollers or rollers.

The receiving area is preferably in the vicinity of the roll changer 03 so that the web immediately following the unwinding of the roll by the pulling-in means 06 is feasible. The delivery area can basically at any point of the Bahnweges to behind the former 04 be arranged. In advantageous embodiment shown here is the delivery area and thus the bobbin 07 after the (last) passed printing unit 02 but before the former 04 arranged. If turner bars are arranged in the superstructure, then the dispensing area may possibly still be located in front of these turner bars in the web path, if the guide for the feed means 06 and the web is not designed to bypass the turning bars.

Preferably, however, the entire web is straight up to the former 04 retracted and only when this train is retracted, the knife is placed in the superstructure and retracted the new partial web on the turning bar. The delivery area is just before the funnel inlet.

für die Frequenz dem Motor 11 ohne Rückführung in einen Regelkreis lediglich aufgeprägt wird. In einer alternativen Ausführung erfolgt eine Steuerung des Motors 11, indem anhand einer Sollwertvorgabe einem inneren Regelkreis des Antriebes ein Sollwert n ._soll für die Drehzahl bzw. Frequenz, d. h. letztlich unter Berücksichtigung des Wickelradius die Auf- bzw. Abwickelgeschwindigkeit des Einzugmittels 06, vorgegeben wird. Hierbei wird beispielsweise ein Istwert einer gemessenen Winkelgeschwindigkeit oder der Anzahl der Umdrehungen pro Zeiteinheit von Bauteil oder Motor einem nicht dargestellten Antriebsregler rückgeführt.In the illustrated embodiment, the bobbin 07 in the delivery area by means of a motor 11 having drive, z. B. an electric motor 11 , in particular by means of an at least with respect to its speed controllable AC motor 11 , powered. In a simpler, preferred embodiment, only a control takes place by the setpoint

for the frequency of the engine 11 is only impressed without feedback in a control loop. In an alternative embodiment, a control of the engine takes place 11 in that, based on a setpoint specification, an setpoint value n is assigned to an internal control circuit of the drive. _should for the speed or frequency, ie ultimately taking into account the winding radius, the winding or unwinding of the catcher 06 , is specified. Here, for example, an actual value of a measured angular velocity or the number of revolutions per unit time of component or motor is fed back to a drive controller, not shown.

The setpoint value n, which ultimately represents the pull-in speed. _{should be} for the speed or frequency is the motor 11 or its drive control by a control device 12 specified. This control device 12 For example, has a frequency converter 13 and a control and / or computing unit 14 , in particular a servo-control unit 14 , z. B. as a servo PLC 14 executed. Based on a target value of a prescribed retraction speed v _soll is now in one in the servo PLC 14 integrated logic (or an additional logical component) determines the target frequency and through the frequency converter 13 for the engine 11 provided. In a simple embodiment, the threading speed v _soll can, for example, via an input medium or a corresponding interface of the control device 12 , the control device 12 be specified directly and manually. In a preferred embodiment, the setting of the draw-in takes place v _to a superordinate control device 16 , z. B. a machine control 16 , This ensures the synchronization between the movement speed of the pulling-in means 06 and at least components or aggregates 02 ; 03 ; 05 the printing press 01 which interact with the web to be gathered, for example physical contact.

By way of example, a rotary drive is shown in the figure 17 the printing unit 02 and / or a rotary drive 18 the roll changer 03 and / or a rotary drive 20 of the folder 05 in signal communication with the machine control 16 , The rotary drives 17 ; 18 ; 20 are preferably formed mechanically independently of each other, but electronically with each other via the machine control 16 connected. When specifying a certain machine speed, z. B. a certain pull-in speed in Einziehbetrieb receive, for example, the printing unit 02 and / or the roll changer 03 (and possibly other aggregates) and the control device 12 the device for drawing correlating with each other, speed-relevant setpoint specifications, which synchronization of the speeds -. B. the unwinding speed on the reel changer 03 or the peripheral speed on the printing cylinder and the web speed - ensure.

The motion control of the subordinate drives 17 ; 18 ; 20 (Setpoint specification) preferably follows a conductance of a so-called electronic master axis Φ. The position of the leading axis Φ can either be on one of the units 02 ; 03 ; 05 , z. B. the folder 05 , the printing press 01 orient and the other aggregates 02 ; 03 From this, supply the specifications or the master axis Φ runs - if necessary after calibration on one of the units 02 ; 03 ; 05 , eg the folder 05 - Free to move and deliver the positions to all units in the further operation 02 ; 03 ; 05 , An angular velocity of this revolving guide axis Φ then corresponds to a predetermined machine speed, for example a "feed rate for automatic feed" or a "print" with a predeterminable speed or product output. As a result, when pulling in through the machine control 16 (or leading axis Φ) thus the movements of at least one interacting with the web, moving aggregate 02 ; 03 (eg printing unit 02 and / or roll changer 03 ) and the catcher 06 synchronized. The setpoint specification of the pull-in speed v _soll to the controller 12 is preferably based on a selected machine speed.

wobei 0X = 07 oder 08, und wobei je nach dem Ort der Anordnung eines die Anzahl der Umdrehungen bzw. überstrichene Winkelgrade erfassenden Sensors 19, z. B. Resolvers 19, eine Transformation von dem einen auf den anderen Spulkörper 07; 08 erfolgen muss.When forming the device with a retracting catchment 06 and the drive of the same by one or both bobbin 07 ; 08 must be specified when specifying the setpoint n. _{should go} to the engine 11 the changing winding radius is taken into account. Although this can in principle be continuous by arranging at least one sensor on the bobbin 07 ; 08 be determined, but it is preferably from the basic diameter of one or both bobbin d07; d08, the number of winding layers or revolutions u _0X on one or both bobbins d07; d08 and the thickness d06 of the catcher 06 determined. Intended for a sustainable tension in the pulling-in means 06 a slight lead in the speed n _{v be} provided, this must also be considered additively. A current setpoint n. _should for a speed in principle, for example, according to the context to

where 0X = 07 or 08 and wherein, depending on the location of the arrangement, a sensor detecting the number of revolutions or swept angles 19 , z. B. resolvers 19 , a transformation from one to the other Spulkörper 07 ; 08 must be done.

In the figure, to count the number of revolutions of the resolver 19 in solid lines in the region of the bobbin 07 , and in dotted line in the area of the bobbin 08 shown.

From the setpoint for the pull-in speed v _soll , the basic diameter of one or both bobbin 07 ; 08 , the number of winding layers or revolutions u _0X on one or both bobbins d07; d08 and the thickness d06 of the catcher 06 will now be in the control and / or computing unit 14 and the frequency converter 13 a corresponding signal for the engine 11 prepared for keeping the feed rate constant and supplied to this. The motor 11 In the delivery area is thus operated speed controlled in the intake operation in terms of a constant retraction speed v. The expression d0X + (2 * d06 * u _0X ) then represents a current calculated diameter D0X (D07, D08) after u _0X revolutions.

A bobbin 08 in the receiving area driving motor 21 , z. B. electric motor 21 , in particular an asynchronous motor 21 , however, is operated at least torque-limited in the intake operation. This is done via the servo control of the control and / or computing unit 14 , The above logic for determining a target frequency for the engine 11 and the servo control for the engine 21 can also be implemented in separate components.

In an advantageous mode of operation, when pulling in a desired belt tightening is produced by driving the motor 21 in the receiving area with a constant retention torque, the engine 21 runs in principle in unwinding opposite direction of rotation. However, it is effective because of the stronger engine 11 forced to unwind for the direction of rotation.

In Einziehbetrieb is the catchment agent 06 thus by the engine 11 and the bobbin 07 circumferential speed controlled by the paster 03 to the delivery area (eg to the former 04 ) pulled, the engine 11 from the frequency converter 13 is fed, and this of the control and / or computing unit 14 a calculated setpoint n. _{is intended} for the frequency (v _to or from the target value of the threading speed) depending on the current engine speed and the computed diameter D07; D08 of the bobbin used for the determination 07 ; 08 receives. The motor 21 in the recording area (eg near the reel changer 03 ) is from the control and / or computing unit 14 driven. In the feed-in mode, for example, it receives a low offset speed in the opposite direction for unwinding. For example, by setting a train setpoint Z _{soll, e} via an input device for feeding the drive, the torque can be limited. The motor 21 becomes of the stronger, speed-controlled engine 11 "Pulled through" and thus builds up the desired strip tension.

When rewinding, the engine is running 11 for example with an adjustable rewinding speed (eg v = 26 m / min) and the engine 21 in the receiving area with an increased speed and a constant torque to produce the band tightening. In rewind mode, the engine is replaced 11 its frequency setpoint, ie the setpoint n. _should , according to the currently calculated diameter D07; D08 of the bobbins 07 ; 08 in the opposite direction. The motor 21 receives an adjustable speed rated with a fixed diameter, z. B. 220 mm for the empty drum. In addition, preferably as in the drawing process an offset speed is added to a constant lead over the engine 11 or its bobbin 07 to make sure. Due to the constant lead of the bobbin 08 and an adjustable train setpoint Z _{soll, r} for rewinding, the desired strip tension is set up in the rewinding operation.

Maintaining a constant pull-in speed, and in particular compliance with certain moments when retracting now allows retraction of the web in such a way that the web and web tension-influencing aggregates in the retracted state to the required conditions for the start of the machine 01 reach already approximate state. This is shown in the figure using the example of a drawing-in means bypassed, indicated dancer roller 22 shown. The dancer roller 22 corrected when operating as a printing press 01 executed machine 01 a present web tension with respect to a selectable constant web tension. This voltage can, for example, by a web tension control (here also in the concept of machine control 16 integrated) and be regulated. With a set target value during retraction and compliance with the torque at the retraction means 06 is now a retraction without bag formation and / or without that an undesirable deflection of the dancer roller 22 done, possible. Ie. the retraction process already takes place with approximately correct path lengths and stresses, so that when the machine is started up later 01 the risk of web breaks or protracted vibrations in the scheme can be reduced. In a further development, a web tension control is already activated during the threading process.

01

Machine, press

02

Printing unit aggregate

03

Reelstands, aggregate

04

formers

05

folder, aggregate

06

feeder means

07

bobbins

08

bobbins

09

10

11

Engine, Electric motor, AC motor

12

control device

13

frequency converter

14

Tax- and / or arithmetic unit, servo control unit, servo PLC

15

16

Control device, superior, machine control

17

drive

18

drive

19

Sensor, resolver

19 '

Sensor, resolver

20

drive

21

Engine, Electric motor, asynchronous motor

22

dancer roll

n. _should

setpoint

v _should

threading

φ

master axis, electronic

Claims (26)

Method for drawing a web into a machine ( 01 ) with a pull-in means which can be conveyed along a pull-in path ( 06 ), to which the material web can be coupled and which by means of a motor ( 11 ) in a receiving area and an engine ( 21 ) is drivable in a delivery area for the web, wherein during the pulling in a first of the two motors ( 11 ; 21 ) is controlled to a predeterminable pull-in speed (v _soll ), characterized in that the second motor ( 21 ; 11 ) with respect to one of the engine ( 21 ; 11 ) is applied, predefinable torque is controlled. Method according to claim 1, characterized in that the first motor ( 11 ; 21 ) is controlled in terms of its speed. Method according to claim 1, characterized in that the first motor ( 11 ; 21 ) with respect to its frequency via a frequency converter ( 13 ) is controlled. Method according to claim 1, characterized in that the two motors ( 11 ; 21 ) each have a bobbin ( 07 ; 08 ) on which the catching means ( 06 ) alternately off or can be wound up. Method according to Claims 1 and 4, characterized in that the control of the first motor ( 11 ; 21 ) in dependence on a current coil diameter (D07, D08) of at least one of the coil bodies ( 07 ; 08 ) he follows. Method according to claim 5, characterized in that in a control device ( 12 ) a setpoint (n. _soll ) for a the engine ( 11 ; 21 ) to be acted upon frequency as a function of the coil diameter (d07, d08) is determined. A method according to claim 5, characterized in that the actual coil diameter (D07; D08) is dependent on a number of wound layers and a thickness d06 of the pulling-in means (D07). 06 ) and a starting diameter or a basic diameter (d07, d08) of a bobbin ( 07 ; 08 ) he follows. A method according to claim 7, characterized in that the number of unwound or wound layers as the number of revolutions by means of a resolver ( 19 ; 19 ' ) on the bobbin ( 07 ; 08 ) or its drive ( 11 ; 21 ) is determined. A method according to claim 8, characterized in that the determination of the number of revolutions on the bobbin ( 08 ) takes place in the recording area. A method according to claim 8, characterized in that the determination of the number of revolutions on the bobbin ( 07 ) takes place in the delivery area. The method of claim 1, characterized in that the first, (v _soll) to a predetermined draw-in towards Einziehbetrieb controllable motor ( 11 ) the collection means ( 06 ) in the delivery area and the second, with respect to a given moment controlled engine ( 21 ) the collection means ( 06 ) in the recording area drives. The method of claim 1, characterized in that the first, (v _soll) to a predetermined draw-in towards Einziehbetrieb controllable motor ( 11 ) the collection means ( 06 ) in the receiving area and the second, with respect to a given moment controlled motor ( 21 ) the collection means ( 06 ) in the delivery area. Method according to claim 1, characterized in that the pulling-in means ( 06 ) driving engine ( 11 ) and a rotary drive ( 17 ; 18 ; 20 ) at least one mechanically independent aggregate ( 02 ; 03 ; 05 ) the machine ( 01 ) are regulated or controlled in relation to their velocity correlated to one another. A method according to claim 1, characterized in that the pulling-in operation of the pulling-in means ( 06 ) driving engine ( 11 ) and a roll changer ( 03 ) driving drive ( 18 ) via a machine control ( 16 ) are driven in their velocity correlated to each other. A method according to claim 1, characterized in that in the Einziehbetrieb the catchment means ( 06 ) driving engine ( 11 ) and a printing unit ( 02 ) driving drive ( 17 ) via a machine control ( 16 ) are driven in their velocity correlated to each other. Method according to claim 1, characterized in that the second motor ( 21 ) in Einziehbetrieb via a servo control of a control device ( 12 ) is operated torque limited. Device for drawing a web into a machine ( 01 ) with a pull-in means which can be conveyed along a pull-in path ( 06 ), to which the material web can be coupled and which by means of a motor ( 11 ) in a receiving area and an engine ( 21 ) is drivable in a delivery area for the web, wherein a first of the two motors ( 11 ; 21 ) is controlled with respect to its speed, characterized in that the second motor ( 21 ; 11 ) is executed controlled with respect to an applied and predetermined moment. Apparatus according to claim 17, characterized in that the first motor ( 11 ) with a control device ( 12 ) is in signal connection, which is adapted _to a frequency signal for the motor from a predetermined pull-in speed (v _soll ) ( 11 ) to create. Apparatus according to claim 18, characterized in that the control device ( 12 ) with a machine control ( 16 ) is in signal communication through which the control device ( 12 ), A target value for the predetermined retraction speed (v) _{is to} be provided. Apparatus according to claim 19, characterized in that the machine control ( 16 ) for transmitting speed-relevant signals in signal communication with a drive ( 17 ; 18 ; 20 ) another, mechanically independent of the engine ( 11 ) driven aggregate ( 02 . 03 ; 05 ) stands. Apparatus according to claim 17, characterized in that a machine control ( 16 ) is provided, which both for transmitting mutually correlated speed-relevant signals to the engine ( 11 ) as well as to a drive ( 17 ; 18 ; 20 ) of a mechanically independently driven unit ( 02 ; 03 ; 05 ) is trained. Apparatus according to claim 20 or 21, characterized in that the machine control ( 16 ) has an electronic guide axle (Φ), from which in the retraction operation both to the engine ( 11 ) as well as to the drive ( 17 ; 18 ; 20 ) of the aggregate ( 02 ; 03 ; 05 ) speed-relevant signals are transmitted. Device according to claim 17, characterized in that the motors ( 11 ; 21 ) each have a bobbin ( 07 ; 08 ) are arranged drivingly. Device according to claim 23, characterized in that on at least one bobbin ( 07 ; 08 ) or its drive a sensor detecting the number of revolutions or swept angles ( 19 ; 19 ' ) is arranged. Device according to claims 18 and 24, characterized in that the control device ( 12 ) has a computing means, which is adapted to a frequency signal for the motor from the predetermined pull-in speed (v _soll ) and the number of revolutions or the swept angles. 11 ) to create. Device according to claim 17, characterized in that the second motor ( 11 ) with a control device ( 14 ) is in signal communication, which is adapted to the engine ( 11 ) with respect to a torque to be controlled.