EP0226166B1 - Procédé et dispositif pour positionner une bande avançant par à-coups - Google Patents

Procédé et dispositif pour positionner une bande avançant par à-coups Download PDF

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Publication number
EP0226166B1
EP0226166B1 EP86117131A EP86117131A EP0226166B1 EP 0226166 B1 EP0226166 B1 EP 0226166B1 EP 86117131 A EP86117131 A EP 86117131A EP 86117131 A EP86117131 A EP 86117131A EP 0226166 B1 EP0226166 B1 EP 0226166B1
Authority
EP
European Patent Office
Prior art keywords
web
distance
feed means
forward feed
tension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86117131A
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German (de)
English (en)
Other versions
EP0226166A1 (fr
Inventor
Hans Dieter Niestrath
Wilfried Kammann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Werner Kammann Maschinenfabrik GmbH and Co KG
Original Assignee
Werner Kammann Maschinenfabrik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Werner Kammann Maschinenfabrik GmbH and Co KG filed Critical Werner Kammann Maschinenfabrik GmbH and Co KG
Priority to AT86117131T priority Critical patent/ATE50230T1/de
Publication of EP0226166A1 publication Critical patent/EP0226166A1/fr
Application granted granted Critical
Publication of EP0226166B1 publication Critical patent/EP0226166B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1882—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling longitudinal register of web

Definitions

  • the invention relates to a method and a device for positioning a material web to be transported in batches by means of at least two feed devices through processing stations arranged between the feed devices, the feed devices being controlled by a programmable computer in which the length of the path to be covered during a transport step is stored .
  • Methods and devices of this type are used, for example, for printing on material webs and, if necessary, for separating, for. B. by means of a punching process that uses individual print images from the material web.
  • the object of the invention is to further develop a method and an apparatus for positioning a material web to be transported in batches in such a way that the material web can be positioned in the individual processing stations with even greater accuracy than before.
  • the dimensions of each print image from treatment station to treatment station should undergo no changes or changes so little that the quality of the end product is not adversely affected.
  • the invention proposes that the tension of the web is measured and the measured value is compared with a target value stored in the computer and if the actual value deviates from the target value at least when the extent of the deviation reaches a certain threshold value exceeds, the drive of at least one of the feed devices is influenced in such a way that, by lengthening or shortening the web material drawn into the area between the two feed devices by transport step, its tension is at least approximated to the desired value. It is expedient to proceed in such a way that the voltage is measured in the period between two successive transport steps and, if the actual value deviates from the target value, the drive is influenced during the next transport step.
  • the web when the tension drops, the web can be pulled out of the machine by a greater distance than the web section that is entered at the end of the feed in the area between the pull-out and the pull-in. It is possible to influence the drive of the feed device at the feed or the drive of the feed device at the pull-out accordingly. It is also possible to influence both feed devices for adapting the voltage to their target value, e.g. B. in such a way that when the target value is undershot in order to then change the voltage in the sense of increasing the same at the pull-out end, the web is pulled out by a greater distance from the machine and at the same time a shorter section of the web is inserted into the machine at the pull-in end.
  • This has the advantage that the change in the elongation or shrinkage of the web caused by the change in tension is distributed more evenly over the entire length of the web, namely possibly from the center of the web section between the feed and the takeoff towards both feed devices.
  • both feed devices run synchronously.
  • a further proposal of the invention can be used in such a way that the path covered by the material web is recorded during the transport step and in the computer with the distance entered and the speed sequence likewise entered compared over the distance of a transport step and if there is a deviation in the speed sequence in Dependent on the effectively covered distance is changed.
  • This measure is based on the consideration that, in order to achieve the required accuracy, it is necessary to regulate the speed sequence depending on the distance, that is to say the repeat or format length.
  • a setpoint speed decrease is thus first entered into the computer, taking into account the time available for a transport step, the acceleration phase at the beginning of each transport step and the deceleration phase at the end of each transport step with an intermediate phase of constant speed, if necessary the speed sequence of a transport step combined.
  • the accuracy of the speed sequence that can be theoretically achieved in this way can hardly be achieved in practice, since the drive means, that is to say the motors which bring about the feed of the web, work with small, unavoidable irregularities which rule it out. that the respective distance of a transport step can be determined via the speed sequence.
  • the invention therefore provides the additional measure of additionally influencing the programmed speed sequence via the result of the path detection in the sense that, if necessary, the deceleration to a standstill is adapted to the actual conditions, depending on the distance actually traveled, to a standstill becomes. This adjustment is usually done in the last section of the delay phase.
  • the step-by-step transport of the web thus achieved with extreme precision ensures that the length of the web section transported in each case in one transport step in the area between the infeed and the outfeed remains as constant as possible, so that changes in the web tension due to different transport steps in terms of their length are avoided or in any case so be kept small so that they are not significant. This means that any voltage changes that may occur can only be attributed to a varying modulus of elasticity over the length of the web, temperature influences, moisture influences and other influences independent of the course of the transport steps.
  • the measure of relating the length of the individual repeats to the neutral fiber of the web can also contribute to the precise execution of the transport step. This can be done in such a way that a value which corresponds to half the thickness of the material web is added to the diameter of the drive drum. In order to carry out the transport step precisely, the length of the individual repeats in the neutral fiber of the web is advantageously measured.
  • the sheet 10 to be printed which is also provided with a protective sheet 11 in the form of a sheet, is drawn off from a supply roll 12 and is first freed from the protective pad 11 in the station 13, which is on the side of the sheet 10 to be provided with the printed image is.
  • the protective pad 11 is rolled up on a supply roll 14 located in the station 13.
  • the web 10 freed from the protective pad 11 arrives in a dancer 16, which is provided with several slidably arranged rollers and, in the usual way, serves to adjust the different feed speeds of the web 10 in the direction of the arrows 17 in front of and behind the Balance dancer 16.
  • the web 10 is continuously drawn off the roll 12, whereas it is gradually transported forward in the feed direction 17 behind the dancer movement.
  • the web 10 reaches a first feed device 18 which is provided with a drive roller 20 and additional guide and deflection rollers or rollers 21, 22 and 23.
  • the drive drum 20 is driven by a DC motor 24.
  • a first screen printing station 25 is arranged, in which, using a printing screen 26 and other conventional means not shown in the drawing, such as. B. squeegee and impression roller, a first print image is applied to the web 10.
  • a printing screen 26 and other conventional means not shown in the drawing such as. B. squeegee and impression roller
  • a first print image is applied to the web 10.
  • the section of the web 10 provided there with the first printed image arrives in the following transport step into a first drying station 27, in which the printing ink applied in the first screen printing station is dried at least to such an extent that a second printed image on the first printed image can be applied to the second screen printing station 28, into which the corresponding section of the web 10 is brought from the first drying station 27 in one of the following transport steps.
  • the second screen printing station 28 is followed by a second drying station 29, in which the printing ink applied in the second screen printing station is dried before the respective section of the web 10 reaches the area of the second feed device 30 in the following transport step.
  • the latter also consists of a drive drum 20 and guide and deflecting rollers or rollers 21, 22, 23, which are arranged in mirror image to the rollers and rollers of the first feed device 18.
  • the drive drum 20 of the second feed device 30 is also driven by a DC motor 24.
  • the second feed device 30 is followed in the feed direction 10 by a second dancer movement 32, which, like the first dancer movement 16, but with the opposite effect, compensates for the intermittent transport of the web 10 between the first feed device 18 and the second feed device 30 and the continuous transport of the Causes web 10 between the second dancer movement 32 and the supply roll 33, onto which the printed web is wound, after a likewise web-shaped protective pad 11 has previously been applied to the printed web 10 by a supply roll 34.
  • a second dancer movement 32 which, like the first dancer movement 16, but with the opposite effect, compensates for the intermittent transport of the web 10 between the first feed device 18 and the second feed device 30 and the continuous transport of the Causes web 10 between the second dancer movement 32 and the supply roll 33, onto which the printed web is wound, after a likewise web-shaped protective pad 11 has previously been applied to the printed web 10 by a supply roll 34.
  • the longitudinal tension of the web 10 is to be kept as constant as possible in the area located between the two feed devices 18 and 30.
  • the deflection roller 23 which belongs to the second feed device 30, with the interposition of a strain gauge 36 (FIG. 2 ) stored, which is connected to a bridge shaft 37 (FIG. 3), so that the longitudinal tension of the web 10 can be determined at any suitable point in time via this strain gauge.
  • the value of the tension of the web 10 detected by the strain gauge bridge 37 between the feed assigned to the first feed device 18 and the pull-out assigned to the second feed device 30 is fed via a line 35 into a main computer 38, in which the desired values for the web tension, for which Repeat length, for the speed sequence and for the thickness of the web material.
  • the setpoints for the speed sequence for each transport step relate to the acceleration at the start of the transport step, the deceleration at the end of the transport step and a phase of constant speed between the acceleration motors and deceleration for the drive motors 24 of both feed devices 18 and 30.
  • a computer 40 and 41 is assigned to each feed device 18 and 30, which receives the desired values relating to the speed, acceleration, deceleration and repeat length from the main computer 38 and forwards them to a downstream DC chopper 42 and 43, respectively, which uses pulse control controls the downstream drive motor 24 of the feed device 18 or 30 in terms of performance.
  • a common current control circuit 50 is also connected between the DC chopper 42 or 43 and the downstream drive motor 24, which is intended to ensure that the associated DC motor 24 runs as vibration-free as possible.
  • a rotary encoder 51 and a tachometer generator 44 are assigned to each drive drum 20 of the two feed devices 18 and 30.
  • the rotary encoder 51 measures the angular position of the drive drum (s) 20, 21, 22, which are connected to one another in terms of transmission, i. that is, the distance traveled by the drive drum (s) 20, 21, 22 during the rotational movement.
  • the tachometer generator 24 measures the speed of the drive drum 20. It is part of a control circuit which inputs the measured speed to the DC chopper via a line 48. In this the actual value of the speed is compared with its target value. In the event of a deviation, the actual speed is adapted to the target speed by influencing the DC motor 24 accordingly.
  • the position report of the respective rotary encoder 51 reaches the associated computer 40 or 41 for pulling in and pulling out via a line 49.
  • the encoder delivers a certain number, e.g. B. 5000, pulses per revolution.
  • the downstream computer 40 or 41 measures at certain time intervals, for. B. after every four milliseconds, the number of pulses arriving between two measurements and concludes from this the distance covered and the speed, that is, the distance per unit of time.
  • the computer 40 or 41 determines by comparison whether the path covered during the transport step from the material web 10 to a specific point in time corresponds to the corresponding path entered in the computer.
  • the target value for the speed entered in this is also changed by the respective computer 40 or 41 and is transferred via line 45 to the DC chopper entered, which then controls the speed sequence according to the new setpoint.
  • the predetermined length is actually drawn into the area between the feed or feed device 18 and the pull-out or feed device 30, so that changes in the tension caused by changes in the feed length, that is to say the repeat length, are avoided.
  • the strain gauge 36 is used to measure the tension present in the web 10 between the pull-in and pull-out between two successive transport steps.
  • the measurement result is sent to the main computer 38 via line 35, where it is compared with the entered target value.
  • the main computer 38 sends a corresponding signal to one of the computers 40 or 41 or possibly both computers 40 and 41, which effect a corresponding correction of the draw-in length via the DC chopper 42 and / or 43 .
  • the web 10 can be provided with optoelectronic or otherwise detectable markings, which make it possible to be at the end of the respective transport step printing web section to the respective printing unit, in particular thus to the screen printing stencil 26 of the respective printing station. It is possible to arrange the screen printing stencil 26 so that it can be displaced in the longitudinal direction of the web 10 in such a way that it is aligned with the section of the web to be printed after each transport step and before the printing process begins. In this way, an exact alignment of the screen printing stencil with the printed image applied in each case in the previous station can be achieved without difficulty, in particular in the second and possibly further printing stations that follow.
  • the web tension can also be measured at any other point between the two feed devices.
  • the facilities required for this can also be arranged at a point in the area between the feed and the pull-out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Attitude Control For Articles On Conveyors (AREA)
  • Intermediate Stations On Conveyors (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (10)

1. Procédé pour positionner une bande de matière (10) qui avance par à-coups sous l'action d'au moins deux systèmes d'entraînement (18, 30), en passant entre ces deux systèmes qui sont commandés par un ordinateur programmable, dans lequel on a affiché la course de chaque mouvement élémentaire d'avance de la bande, caractérisé en ce qu'on mesure la tension de la bande (10) entre deux phases de son mouvement d'avance, pour comparer cette valeur mesurée avec une valeur de consigne introduite dans la mémoire de l'ordinateur, en vue d'une réaction, au moins lorsque l'écart ainsi trouvé dépasse une certaine valeur-limite, consistant à modifier le fonctionnement d'au moins l'un des systèmes d'entraînement (18, 30), pour augmenter ou raccourcir la longueur élémentaire de la bande qui passe entre les deux systèmes d'entraînement à chaque phase d'avance, afin que la tension de la bande tende au moins à se rapprocher de la valeur de consigne fixée pour cette tension.
2. Procédé selon la revendication 1, caractérisé en ce qu'on agit sur le système d'entraînement situé en aval (30) pour commander l'allongement ou le raccourcissement de chaque course élémentaire d'avance de la bande.
3. Procédé selon la revendication 1, caractérisé en ce qu'on agit sur le système d'entraînement situé en amont (18) pour commander l'allongement ou le raccourcissement de chaque course élémentaire d'avance de la bande.
4. Procédé selon la revendication 1, caractérisé en ce qu'on agit sur les deux systèmes d'entraînement situés en amont et.en aval_(18, 30), pour commander l'allongement ou le raccourcissement de chaque course élémentaire d'avance de la bande.
5. Procédé selon la revendication 1, caractérisé en ce qu'on mesure la tension de la bande (10) à l'endroit des fibres neutres de celle-ci.
6. Procédé selon la revendication 1, caractérisé en ce qu'on mesure la course élémentaire d'avance de la bande de matière (10) pendant une phase du mouvement de celle-ci, pour comparer dans l'ordinateur cette valeur mesurée avec la valeur de consigne de la course élémentaire de la bande, et avec les valeurs de la loi d'évolution de vitesse de la bande, également fixées par consigne pour une course élémentaire d'avance, et en ce qu'on modifie la course élémentaire d'avance de la bande en fonction de la valeur trouvée effectivement pour cette course, lorsqu'il existe un écart entre l'évolution effective de la vitesse de la bande et les valeurs de consigne correspondantes, en fonction de la valeur effective de la course élémentaire de la bande.
7. Procédé selon la revendication 1, caractérisé en ce que la loi d'évolution de vitesse de la bande de matière (10) comporte une phase d'accélération et une phase de ralentissement, et en ce qu'on intervient dans la phase de ralentissement pour modifier la loi d'évolution de vitesse de la bande, en fonction de la course élémentaire effectivement parcourue par la bande.
8. Dispositif pour positionner une bande de matière (10) qui avance par à-coups en défilant à travers des postes de traitement, sous l'action de deux systèmes d'entraînement (18, 30) entre lesquels sont situés les postes de traitement, ces systèmes d'entraînement (18, 30) étant commandés par un ordinateur programmable dans la mémoire duquel on a enregistré la valeur de consigne de la course élémentaire parcourir par la bande entre deux phases successives de son mouvement, caractérisé en ce qu'il comporte au moins un système de mesure (36, 37), pour déterminer la tension de la bande mobile (1.0), et en ce qu'au moins l'un des systèmes d'entraînement (18, 30) de la bande est asservi à cette valeur mesurée de la tension de la bande, en vue de maintenir cette tension constante.
9. Dispositif selon la revendication 8, caractérisé en ce que le système de mesure (36, 37) qui sert à mesurer la tension de la bande est disposé du côté aval de la partie de la bande qui est comprise entre les deux systèmes d'entraînement (18, 30).
10. Dispositif selon la revendication 8, caractérisé en ce qu'il comporte un système de mesure (51), pour déterminer la valeur effective de la course élémentaire d'avance de la bande de matière (10), et des moyens pour envoyer à l'ordinateur (40, 4-1) cette valeur effective de la course -élémentaire, afin de la comparer avec ta valeur de consigne correspondante affichée dans l'ordinateur, et avec les valeurs de consigne de la loi de variation de vitesse de la bande, également affichées dans l'ordinateur pour un déplacement élémentaire type de la bande, afin de rectifier la valeur de la course élémentaire de la bande, lorsque la valeur effective de cette course élémentaire s'écarte de la valeur de consigne correspondante.
EP86117131A 1985-12-12 1986-12-09 Procédé et dispositif pour positionner une bande avançant par à-coups Expired - Lifetime EP0226166B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117131T ATE50230T1 (de) 1985-12-12 1986-12-09 Verfahren und vorrichtung zum positionieren einer absatzweise vorzutransportierenden materialbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3543846 1985-12-12
DE19853543846 DE3543846A1 (de) 1985-12-12 1985-12-12 Verfahren und vorrichtung zum positionieren einer absatzweise vorzutransportierenden materialbahn

Publications (2)

Publication Number Publication Date
EP0226166A1 EP0226166A1 (fr) 1987-06-24
EP0226166B1 true EP0226166B1 (fr) 1990-02-07

Family

ID=6288227

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117131A Expired - Lifetime EP0226166B1 (fr) 1985-12-12 1986-12-09 Procédé et dispositif pour positionner une bande avançant par à-coups

Country Status (4)

Country Link
US (1) US4848630A (fr)
EP (1) EP0226166B1 (fr)
AT (1) ATE50230T1 (fr)
DE (2) DE3543846A1 (fr)

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KR20120132691A (ko) 2010-04-29 2012-12-07 오또꿈뿌 오와이제이 높은 성형성을 구비하는 페라이트-오스테나이트계 스테인리스 강의 제조 및 사용 방법
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Publication number Publication date
ATE50230T1 (de) 1990-02-15
DE3543846C2 (fr) 1992-08-27
EP0226166A1 (fr) 1987-06-24
US4848630A (en) 1989-07-18
DE3543846A1 (de) 1987-06-19
DE3668873D1 (de) 1990-03-15

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