EP0432373B1 - Device for feeding a strip material step by step - Google Patents

Device for feeding a strip material step by step Download PDF

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Publication number
EP0432373B1
EP0432373B1 EP90116857A EP90116857A EP0432373B1 EP 0432373 B1 EP0432373 B1 EP 0432373B1 EP 90116857 A EP90116857 A EP 90116857A EP 90116857 A EP90116857 A EP 90116857A EP 0432373 B1 EP0432373 B1 EP 0432373B1
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EP
European Patent Office
Prior art keywords
feeding unit
movement
workpiece
shaft
feeding
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
EP90116857A
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German (de)
French (fr)
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EP0432373A1 (en
Inventor
Helmut Messner
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Bruderer AG
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Bruderer AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/10—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers
    • B21D43/11—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by grippers for feeding sheet or strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
    • B21D43/09—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers by one or more pairs of rollers for feeding sheet or strip material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y10T74/18248—Crank and slide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2173—Cranks and wrist pins
    • Y10T74/2183—Counterbalanced

Definitions

  • the present invention relates to a device for the step-by-step advancement of a band-shaped workpiece, with two feed units which are intended to clamp a respective workpiece between them, the first feed unit of which can be moved periodically to clamp the workpiece against the second feed unit and to release the workpiece therefrom is which two feed units are driven by a common shaft via an intermediate drive.
  • a feed device according to the preamble of claim 1 is known from CH-A-543 932.
  • Such devices are used, for example, as so-called feeders in punch presses. They are used to gradually push a band-shaped workpiece through a punch press, with the intended work, e.g. Punching, embossing etc. is carried out.
  • the sequence of movements of such devices for the stepwise advancement of a band-shaped workpiece can be divided into a number of steps as follows. It is assumed that the upper feed unit and the lower feed unit each have a feed roller according to known designs, for example as disclosed in CH-A-543 932. In operation, the two rollers perform an oppositely oscillating movement.
  • the lower feed roller is stationary, ie it is rotatably mounted in the respective machine housing and only performs oscillating movements.
  • the upper feed roller performs the same oscillating movements as the lower roller, but is additionally arranged such that it can be moved against and away from the lower feed roller in order to clamp or release the respective workpiece.
  • the upper feed roller accordingly carries out two movements, on the one hand the oscillating movement and on the other hand the up and down movement.
  • the individual operating steps now proceed as follows, the effect of the pressure ruler known in such devices being omitted for the sake of simplifying the explanation. It is assumed that the band-shaped workpiece has stopped and that a punching operation has just been completed. The tool, ie the catch pins, release the tape. Now the top roller, which is not oscillating at this time, lowers onto the belt, which is thus clamped between the top roller and the bottom roller, which is also stationary. Then both rollers start to rotate and push the belt forward by a fixed distance and come to a standstill again. The top roller lifts off, the tool closes and the punching work is done again. At the same time, when the top roller is lifted, the same and the bottom roller rotate back to their original position, so that the next feed step can take place after the belt has been released again by the tool.
  • both rollers are driven.
  • only the lower roller is driven and the upper roller is freely rotatable, so that it is only rotated during advancement due to the counterforce generated when the workpiece is clamped.
  • Another variant is the so-called pliers feed.
  • an upper clamping part which forms the jaw of the pliers, is pressed against a lower, sled-shaped part by means of, for example, a roller, the band-shaped workpiece being clamped between these two parts, the oscillating movement then for advancing the workpiece and for returning the clamping parts in the original position is straight.
  • the rollers or tongs of the known feeders are usually driven by means of crank drives. Due to this form of drive, the standstill is in the respective end position of the oscillation movement, i.e. extremely short at the time of reversal of the direction of the rotational movement or the straight-line movement, only a few angular degrees long in relation to the crank mechanism. During this movement or working phase, the acceleration and, accordingly, the deceleration of the moving components reach the maximum values. The so-called dynamic deformation also reaches the maximum value due to the elasticity of the respective components. Due to the steadily increasing speed of punching presses for economic reasons and their feed devices, the longer the accelerations and the longer the higher the deformations of the work parts and the strip-shaped workpiece.
  • the invention will remedy this.
  • the invention as characterized in the claims, achieves the object of providing a device for the step-by-step advancement of a band-shaped workpiece, in which the drive pin of the crank drive for driving the second feed unit performs an oscillating movement in operation, the crank drive in an intermediate shaft is mounted, which in turn is mounted in a carriage oscillating in the opposite direction to the oscillating movement of the drive pin.
  • the device is driven by a shaft 10 which is connected to the drive e.g. the punch press is connected in such a way that it rotates synchronously with the lifting movement of the ram of the punch press.
  • This shaft 10 (see FIG. 3) has a control cam 11 at one end or is connected to a control cam 11.
  • a cam roller 12 is supported on this control cam 11.
  • This cam roller 12 is mounted in a link 13, which is also shown in FIG. 1.
  • a transmission rod 14 is articulated on the handlebar 13 and is articulated to a so-called rocker 2.
  • the rocker 2 is supported via springs 3 and 4 against the housing 20 of the device.
  • the rocker 2 is mounted on the housing 20 via a pair of arms 5.
  • the rocker 2 and the pair of arms 5 can also be seen in FIG. 2.
  • An upper roller 1 is also rotatably mounted in the rocker 2.
  • the top roller 1 rests on an elastically movable pliers 6.
  • This pliers 6, or this jaw of the overall pliers, can be moved against a carriage 8 which is supported on a lower roller 7 which is rotatable but non-displaceably mounted in the housing.
  • the components described so far are known.
  • the further individual components, in particular those shown in FIG. 1, are not essential for understanding the present invention.
  • the oscillating movement for advancing the band-shaped workpiece 24 is effected by a crank mechanism 16 (FIG. 3) which is mounted eccentrically in an intermediate shaft 15 in such a way that its drive pin 17 performs an oscillating movement when the shaft 10 rotates.
  • the eccentric mounting of a crank mechanism for generating an oscillating movement of its drive pin is known as such and is therefore not described in more detail.
  • the drive pin 17 of the crank mechanism 16 shown in FIG. 3 is also drawn in FIG. 2, which represents one of the many possible designs for generating the oscillating movement.
  • the drive pin 17 is fixedly connected to a rocker arm 26 which is pivotally mounted in a bearing 27.
  • a sliding block 28 is mounted, in which the pin 29 of a crank 30 is inserted.
  • This crank 30 is on the one hand firmly connected to the lower roller 7 and on the other hand is equipped at the top with a toothed segment 31 which meshes with a longitudinally displaceable toothed rack 9 which in turn is firmly connected to a carriage 8 forming the lower part of the feed tongs.
  • the crank mechanism 16 is mounted eccentrically in an intermediate shaft 15 and has a spur-toothed section 32 which meshes with an internal toothing 33 of the intermediate shaft 15, such that when the intermediate shaft 15 rotates, the drive pin 17 in a known manner only has a reciprocating oscillating movement executes.
  • the intermediate shaft 15 is in turn supported in a carriage 18 via roller bearings 34, 35. This carriage 18 is supported in guide pieces 36, 37 so that it can be moved back and forth in a straight line.
  • the movability is, with reference to FIG. 3, perpendicular to the drawing sheet towards the viewer and away from the viewer.
  • the intermediate shaft is connected at its left end to a cam disk 21, which in turn is connected to the shaft 10 via a cross disk 38.
  • the cam disk 21 is guided between two cam rollers 19, 19 '(see FIG. 4), which cam rollers 19, 19' are mounted in a stationary manner in the housing 20.
  • the cam disk 21 has a circumferential control surface, ie a guide surface, which is generally circular and a projection section 22 and a diametrical one has opposite flattened portion 23. It is accordingly apparent from Figure 4 that when the cam disc 21 rotates, it performs an oscillating horizontal movement due to the cam rollers 19, 19 'and the projection portion 22 and the flattened portion 23, which movement is transmitted to the carriage 18 via the intermediate shaft 15.
  • the cam disk 21, in particular its projection section 22 and flattened section 23, is designed and arranged in such a way that the intermediate shaft 15 performs a movement opposite to the drive journal 17 of the crank mechanism and also performs the same over a larger crank angle.
  • the sum of these two movements in the sections of the respective end positions O, i.e. the drive pin 17 is now stationary for a longer period (e.g. 30 ° crank angle).

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum schrittweisen Vorschieben eines bandförmigen Werkstückes, mit zwei, ein jeweiliges Werkstück zwischen sich klemmend aufzunehmen bestimmten Vorschubeinheiten, wovon die erste Vorschubeinheit periodisch zum Klemmen des Werkstückes gegen die zweite Vorschubeinheit und zum Frei-geben des Werkstückes von derselben weg bewegbar ist, welche zwei Vorschubeinheiten von einer gemeinsamen Welle her über jeweils einen Zwischentrieb getrieben sind.The present invention relates to a device for the step-by-step advancement of a band-shaped workpiece, with two feed units which are intended to clamp a respective workpiece between them, the first feed unit of which can be moved periodically to clamp the workpiece against the second feed unit and to release the workpiece therefrom is which two feed units are driven by a common shaft via an intermediate drive.

Es ist eine Vorschubvorrichtung gemäss dem Oberbegriff des Patentanspruchs 1 aus der CH-A-543 932 bekannt.A feed device according to the preamble of claim 1 is known from CH-A-543 932.

Solche Vorrichtungen werden beispielsweise als sogenannte Vorschubapparate in Stanzpressen verwendet. Sie dienen dazu, ein bandförmiges Werkstück schrittweise durch eine Stanzpresse zu schieben, wobei während dem jeweiligen Stillstand des Werkstückes die vorgesehene Arbeit, z.B. Stanzen, Prägen etc. durchgeführt wird.Such devices are used, for example, as so-called feeders in punch presses. They are used to gradually push a band-shaped workpiece through a punch press, with the intended work, e.g. Punching, embossing etc. is carried out.

Der Bewegungsablauf solcher Vorrichtungen zum schrittweisen Vorschieben eines bandförmigen Werkstückes lässt sich in eine Anzahl Schritte wie folgt unterteilen. Es sei davon ausgegangen, dass die obere Vorschubeinheit und die untere Vorschubeinheit je eine Vorschubwalze gemäss bekannten Ausbildungen aufweisen, beispielsweise wie in der CH-A-543 932 offenbart ist. Im Betrieb führen die zwei Walzen eine gegensinnig oszillierende Bewegung durch. Dabei ist die untere Vorschubwalze ortsfest, d.h. sie ist im jeweiligen Maschinengehäuse drehbar gelagert und führt lediglich oszillierende Bewegungen aus. Die obere Vorschubwalze führt dieselben oszillierenden Bewegungen wie die Unterwalze aus, ist jedoch zusätzlich derart angeordnet, dass sie gegen die untere Vorschubwalze und von dieser weg bewegbar ist, um das jeweilige Werkstück festzuklemmen bzw. freizugeben. Die obere Vorschubwalze führt demgemäss zwei Bewegungen durch, einerseits die oszillierende Bewegung und andererseits die Auf- und Abbewegung. Die einzelnen Betriebsschritte verlaufen nun wie folgt, wobei aus Gründen der Vereinfachung der Erklärung die Wirkung des in solchen Vorrichtungen bekannten Anpresslineals weggelassen ist. Es sei davon ausgegangen, dass das bandförmige Werkstück stillsteht und eine Stanzoperation soeben beendet worden ist. Das Werkzeug, d.h. die Fangstifte geben das Band frei. Nun senkt sich vorerst die in diesem Zeitpunkt nicht oszillierende Oberwalze auf das Band, das somit zwischen der Oberwalze und der ebenfalls stillstehenden Unterwalze geklemmt wird. Danach beginnen beide Walzen zu rotieren und schieben das Band um eine festgelegte Strecke vor und kommen wieder zum Stillstand. Die Oberwalze hebt ab, das Werkzeug schliesst und wieder wird die Stanzarbeit verrichtet. Gleichzeitig rotieren bei abgehobener Oberwalze dieselbe und die Unterwalze in ihre Ursprungsstellung zurück, so dass nach dem erneuten Freigeben des Bandes durch das Werkzeug der nächste Vorschubschritt erfolgen kann.The sequence of movements of such devices for the stepwise advancement of a band-shaped workpiece can be divided into a number of steps as follows. It is assumed that the upper feed unit and the lower feed unit each have a feed roller according to known designs, for example as disclosed in CH-A-543 932. In operation, the two rollers perform an oppositely oscillating movement. The lower feed roller is stationary, ie it is rotatably mounted in the respective machine housing and only performs oscillating movements. The upper feed roller performs the same oscillating movements as the lower roller, but is additionally arranged such that it can be moved against and away from the lower feed roller in order to clamp or release the respective workpiece. The upper feed roller accordingly carries out two movements, on the one hand the oscillating movement and on the other hand the up and down movement. The individual operating steps now proceed as follows, the effect of the pressure ruler known in such devices being omitted for the sake of simplifying the explanation. It is assumed that the band-shaped workpiece has stopped and that a punching operation has just been completed. The tool, ie the catch pins, release the tape. Now the top roller, which is not oscillating at this time, lowers onto the belt, which is thus clamped between the top roller and the bottom roller, which is also stationary. Then both rollers start to rotate and push the belt forward by a fixed distance and come to a standstill again. The top roller lifts off, the tool closes and the punching work is done again. At the same time, when the top roller is lifted, the same and the bottom roller rotate back to their original position, so that the next feed step can take place after the belt has been released again by the tool.

Aus Gründen der Offenbarung sei zusätzlich erwähnt, dass verschiedene Ausführungen solcher Vorschubapparate bekannt sind. Gemäss einer Variante sind beide Walzen getrieben. Bei anderen Varianten ist lediglich die Unterwalze getrieben und die Oberwalze frei drehbar gelagert, so dass sie lediglich beim Vorschieben aufgrund der beim Klemmen des Werkstückes entstehenden Gegenkraft rotiert wird. Eine weitere Variante ist der sogenannte Zangenvorschub. Bei diesem wird ein oberer, die Backe der Zange bildender Klemmteil mittels beispielsweise ebenfalls einer Walze gegen einen unteren, schlittenförmigen Teil gepresst, wobei das bandförmige Werkstück zwischen diesen zwei Teilen geklemmt wird, wobei dann die oszillierende Bewegung zum Vorschieben des Werkstücks und für das Rücklaufen der klemmenden Teile in die Ursprungstellung geradlinig verläuft.For reasons of disclosure, it should also be mentioned that various designs of such feed devices are known. According to a variant, both rollers are driven. In other variants, only the lower roller is driven and the upper roller is freely rotatable, so that it is only rotated during advancement due to the counterforce generated when the workpiece is clamped. Another variant is the so-called pliers feed. In this case, an upper clamping part, which forms the jaw of the pliers, is pressed against a lower, sled-shaped part by means of, for example, a roller, the band-shaped workpiece being clamped between these two parts, the oscillating movement then for advancing the workpiece and for returning the clamping parts in the original position is straight.

Die Walzen bzw. Zangen der bekannten Vorschubapparate werden üblicherweise mittels Kurbeltrieben angetrieben. Aufgrund dieser Antriebsform ist der Stillstand in der jeweiligen Endlage der Oszillationsbewegung, d.h. im Zeitpunkt der Umkehr der Richtung der Rotationsbewegung bzw. der geradlinigen Bewegung äusserst kurz, bezogen auf den Kurbeltrieb nur wenige Winkelgrade lang. Während dieser Bewegungs- bzw. Arbeitsphase erreicht die Beschleunigung und entsprechend die Verzögerung der bewegten Bauteile die maximalen Werte. Damit erreicht auch die sogenannte dynamische Deformation aufgrund der Elastizität der jeweiligen Bauteile den maximalen Wert. Aufgrund der aus wirtschaftlichen Gründen stetig steigenden Drehzahl von Stanzpressen und entsprechend deren Vorschubapparate ergeben sich je länger je höhere Beschleunigungen und damit je länger je höhere Deformationen der Arbeitsteile und auch des bandförmigen Werkstückes. Die scheinbare Stillstandzeit ist derart kurz, dass sowohl ein vollständiges Abklingen der auch noch so kleinen elastischen Deformation von Maschinenteilen und vom Werkstück als auch ein vollständiges Abklingen etwelcher Schwingungen nicht erfolgen kann. Die Folge davon ist eine ungewollte Veränderung der jeweiligen Vorschublänge und auch ungenaue Erzeugnisse.The rollers or tongs of the known feeders are usually driven by means of crank drives. Due to this form of drive, the standstill is in the respective end position of the oscillation movement, i.e. extremely short at the time of reversal of the direction of the rotational movement or the straight-line movement, only a few angular degrees long in relation to the crank mechanism. During this movement or working phase, the acceleration and, accordingly, the deceleration of the moving components reach the maximum values. The so-called dynamic deformation also reaches the maximum value due to the elasticity of the respective components. Due to the steadily increasing speed of punching presses for economic reasons and their feed devices, the longer the accelerations and the longer the higher the deformations of the work parts and the strip-shaped workpiece. The apparent downtime is so short that it is not possible for the elastic deformation of machine parts and the workpiece, however small, to completely subside, nor for any vibrations to completely subside. The consequence of this is an unwanted change in the respective feed length and also imprecise products.

Aehnliche Schwierigkeiten ergeben sich weiter in bezug auf die Umsteuerung der Haltezangen oder Oberwalzen, welche bekanntlich nur dann auf das Werkstück abgesenkt bzw. davon abgehoben werden können, wenn keine Vorschubbewegung vorhanden ist. Aufgrund der genannten kurzen Stillstandphasen müssen die jeweiligen Klemmglieder, (Oberwalze, Zange) äusserst schnell auf das Werkstück abgesenkt werden. Dieses führt zu einer hohen Auftreffgeschwindigkeit eines jeweiligen Haltegliedes auf das Werkstück, d.h. es ist eine grosse Schlagenergie vorhanden, aufgrund welcher insbesondere bandförmige Werkstücke aus einem relativ weichen Werkstoff plastisch verformt werden.Similar difficulties arise in relation to the reversal of the holding tongs or top rollers, which, as is known, can only be lowered or lifted onto the workpiece if there is no feed movement. Because of the short mentioned The respective clamping elements (top roller, pliers) must be lowered to the workpiece extremely quickly. This leads to a high impact speed of a respective holding member on the workpiece, ie there is a large impact energy, due to which in particular band-shaped workpieces made of a relatively soft material are plastically deformed.

Hier wird die Erfindung Abhilfe schaffen. Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, eine Vorrichtung zum schrittweisen Vorschieben eines bandförmigen Werkstückes zu schaffen, bei welcher der Antriebszapfen des Kurbeltriebs zum Antrieb der zweiten Vorschubeinheit im Betrieb eine oszillierende Bewegung ausführt, wobei der Kurbeltrieb in einer Zwischenwelle gelagert ist, welche ihrerseits in einem gegenläufig zur oszillierenden Bewegung des Antriebszapfens oszillierenden Schlitten gelagert ist.The invention will remedy this. The invention, as characterized in the claims, achieves the object of providing a device for the step-by-step advancement of a band-shaped workpiece, in which the drive pin of the crank drive for driving the second feed unit performs an oscillating movement in operation, the crank drive in an intermediate shaft is mounted, which in turn is mounted in a carriage oscillating in the opposite direction to the oscillating movement of the drive pin.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass der Antriebszapfen in den jeweiligen Endlagen der oszillierenden Bewegung während einer längeren Zeitspanne, bezogen auf den Kurbeltrieb, stillsteht, so dass Schwingungen von Vorrichtungsteilen und des Werkzeuges vor dem Bearbeitungsschritt abklingen können und dass die Auftreffgeschwindigkeit der oberen Vorschubeinheit auf das zu klemmende Werkstück kleiner ist, so dass keine plastischen Verformungen derselben entstehen.The advantages achieved by the invention are essentially to be seen in the fact that the drive pin in the respective end positions of the oscillating movement remains stationary for a longer period of time, based on the crank mechanism, so that vibrations of device parts and of the tool can subside before the machining step and that the speed of impact of the upper feed unit on the workpiece to be clamped is lower, so that no plastic deformations of the same occur.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen näher erläutert.The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment.

Es zeigt :

  • Figur 1 eine Schnittansicht eines Teiles eines bekannten Vorschubapparates,
  • Figur 2 eine gegenüber der Figur 1 um 90° gedrehte Schnittansicht eines bekannten Vorschubapparates,
  • Figur 3 eine Schnittansicht, in welcher eine Ausführung der Erfindung dargestellt ist, und
  • Fig. 4 einen Schnitt entlang der Linie A-A der Figur 3.
It shows :
  • FIG. 1 shows a sectional view of a part of a known feed apparatus,
  • FIG. 2 shows a sectional view of a known feed apparatus rotated by 90 ° with respect to FIG. 1,
  • Figure 3 is a sectional view in which a Implementation of the invention is shown, and
  • 4 shows a section along the line AA of FIG. 3.

Zum Verständnis der Erfindung wird vorerst die allgemeine Arbeitsweise der Vorrichtung zum schrittweisen Vorschieben eines bandförmigen Werkstückes beschrieben. Der Antrieb der Vorrichtung erfolgt von einer Welle 10 her, welche mit dem Antrieb z.B. der Stanzpresse derart verbunden ist, dass sie synchron mit der Hubbewegung des Stössels der Stanzpresse rotiert. Diese Welle 10 (siehe Figur 3) weist bei einem Ende einen Steuernocken 11 auf, bzw. ist mit einem Steuernocken 11 verbunden. Auf diesem Steuernocken 11 ist eine Nockenrolle 12 abgestützt. Diese Nockenrolle 12 ist in einem Lenker 13 gelagert, der auch in der Figur 1 gezeichnet ist. Am Lenker 13 ist eine Uebertragungsstange 14 angelenkt, die mit einer sogenannten Wippe 2 gelenkig verbunden ist. Die Wippe 2 ist über Federn 3 und 4 gegen das Gehäuse 20 der Vorrichtung abgestützt. Weiter ist die Wippe 2 über ein Armpaar 5 am Gehäuse 20 gelagert. Die Wippe 2 und das Armpaar 5 sind auch in der Figur 2 ersichtlich.In order to understand the invention, the general mode of operation of the device for gradually advancing a band-shaped workpiece is described. The device is driven by a shaft 10 which is connected to the drive e.g. the punch press is connected in such a way that it rotates synchronously with the lifting movement of the ram of the punch press. This shaft 10 (see FIG. 3) has a control cam 11 at one end or is connected to a control cam 11. A cam roller 12 is supported on this control cam 11. This cam roller 12 is mounted in a link 13, which is also shown in FIG. 1. A transmission rod 14 is articulated on the handlebar 13 and is articulated to a so-called rocker 2. The rocker 2 is supported via springs 3 and 4 against the housing 20 of the device. Furthermore, the rocker 2 is mounted on the housing 20 via a pair of arms 5. The rocker 2 and the pair of arms 5 can also be seen in FIG. 2.

In der Wippe 2 ist weiter eine Oberwalze 1 drehbar gelagert. In der in den Figuren 1 und 2 gezeigten Betriebsstellung liegt die Oberwalze 1 auf einer elastisch bewegbaren Zange 6 auf. Diese Zange 6, bzw. diese Backe der Gesamtzange, ist gegen einen Schlitten 8 bewegbar, welcher auf einer im Gehäuse drehbar, jedoch unverschiebbar gelagerten Unterwalze 7 abgestützt ist. Die bis jetzt beschriebenen Bauteile sind bekannt. Die weiteren einzelnen, insbesondere in der Figur 1 gezeichneten Bauteile sind für das Verständnis der vorliegenden Erfindung unwesentlich.An upper roller 1 is also rotatably mounted in the rocker 2. In the operating position shown in FIGS. 1 and 2, the top roller 1 rests on an elastically movable pliers 6. This pliers 6, or this jaw of the overall pliers, can be moved against a carriage 8 which is supported on a lower roller 7 which is rotatable but non-displaceably mounted in the housing. The components described so far are known. The further individual components, in particular those shown in FIG. 1, are not essential for understanding the present invention.

Im Betrieb rotiert die Welle 10 und damit rotiert der Steuernocken 11. Aufgrund der Nockenrolle 12 führt der Lenker 13 eine Schwenkbewegung aus, womit die Uebertragungsstange 14 vertikal auf- und abwärts bewegt wird. Diese Stange 14 bewirkt ihrerseits die Wippbewegung der Wippe 2, womit allgemein die Oberwalze 1 zum Klemmen des bandförmigen Werkstückes gegen die Zange 6 und von derselben weg bewegt wird.In operation, the shaft 10 rotates and thus the control cam 11 rotates. Because of the cam roller 12, the link 13 executes a pivoting movement, with which the transmission rod 14 is moved vertically up and down. These Rod 14 in turn effects the rocking movement of rocker 2, which generally moves upper roller 1 to clamp the band-shaped workpiece against and away from pliers 6.

Die oszillierende Bewegung zum Vorschieben des bandförmigen Werkstückes 24 wird durch einen Kurbeltrieb 16 (Figur 3) bewirkt, welcher derart in einer Zwischenwelle 15 exzentrisch gelagert ist, dass sein Antriebszapfen 17 beim Rotieren der Welle 10 eine Oszillationsbewegung durchführt. Die exzentrische Lagerung eines Kurbeltriebes zur Erzeugung einer oszillierenden Bewegung seines Antriebszapfens ist als solche bekannt und wird somit auch nicht näher beschrieben. Der Antriebszapfen 17 des in der Figur 3 gezeigten Kurbeltriebes 16 ist auch in der Figur 2 gezeichnet, welche eine der vielen möglichen Ausführungen zur Erzeugung der oszillierenden Bewegung darstellt. Der Antriebszapfen 17 ist fest mit einer Schwinge 26 verbunden, die schwenkbar in einem Lager 27 gelagert ist. Im entgegengesetzten Ende der Schwinge 26 ist ein Gleitstein 28 gelagert, in welchen der Zapfen 29 einer Kurbel 30 eingesetzt ist. Diese Kurbel 30 ist einerseits mit der Unterwalze 7 fest verbunden und ist anderseits oben mit einem Zahnsegment 31 ausgerüstet, welches mit einer längsverschiebbaren Zahnstange 9 kämmt, die ihrerseits mit einem den unteren Teil der Vorschubzange bildenden Schlitten 8 fest verbunden ist.The oscillating movement for advancing the band-shaped workpiece 24 is effected by a crank mechanism 16 (FIG. 3) which is mounted eccentrically in an intermediate shaft 15 in such a way that its drive pin 17 performs an oscillating movement when the shaft 10 rotates. The eccentric mounting of a crank mechanism for generating an oscillating movement of its drive pin is known as such and is therefore not described in more detail. The drive pin 17 of the crank mechanism 16 shown in FIG. 3 is also drawn in FIG. 2, which represents one of the many possible designs for generating the oscillating movement. The drive pin 17 is fixedly connected to a rocker arm 26 which is pivotally mounted in a bearing 27. In the opposite end of the rocker 26, a sliding block 28 is mounted, in which the pin 29 of a crank 30 is inserted. This crank 30 is on the one hand firmly connected to the lower roller 7 and on the other hand is equipped at the top with a toothed segment 31 which meshes with a longitudinally displaceable toothed rack 9 which in turn is firmly connected to a carriage 8 forming the lower part of the feed tongs.

Im Betrieb, d.h. beim Rotieren der Welle 10, führt der Antriebszapfen 17 des Kurbeltriebs 16 eine Oszillationsbewegung aus, so dass die Schwinge 26 um das Lager 17 schwenkt, so dass die Kurbel 30 aufgrund des im Gleitstein 28 hineinragenden Zapfens 29 eine Oszillationsbewegung ausführt. Diese Oszillationsbewegung wird nun offensichtlich durch die Unterwalze 7, siehe Figuren 1 und 2, durchgeführt. In dieser gezeichneten Ausführung ist die Oberwalze 1 frei drehbar gelagert, wobei die Vorschubbewegung durch das letztlich auf den Schlitten 8 einwirkende Zahnsegment 31 der Kurbel 30 bewirkt wird.In operation, ie when the shaft 10 rotates, the drive pin 17 of the crank mechanism 16 carries out an oscillating movement, so that the rocker arm 26 pivots about the bearing 17, so that the crank 30 performs an oscillating movement due to the pin 29 protruding into the sliding block 28. This oscillation movement is now obviously carried out by the lower roller 7, see FIGS. 1 and 2. In this illustrated embodiment, the upper roller 1 is freely rotatable, the feed movement due to that ultimately acting on the carriage 8 Tooth segment 31 of the crank 30 is effected.

Es ist nun eingangs gesagt worden, dass bei den bekannten Vorschubapparaten mit Kurbeltrieb der scheinbare Stillstand in der Endlage der Oszillationsbewegung sehr kurz, nur wenige Winkelgrade betragend, ist, so dass einerseits die "Ruhezeit" der beweglichen Teile einschliesslich des Bandes derart klein ist, dass die elastische dynamische Deformation nicht abklingen kann und dass auch mögliche Schwingungen nicht abklingen können. Die oszillierende Bewegung der Vorschubteile wird nun grundsätzlich durch den Antriebszapfen 17 des Kurbeltriebs 16 bewirkt, welcher entsprechend nur wenige Winkelgrade lang stillsteht.It has now been said at the beginning that in the known feed devices with crank drive the apparent standstill in the end position of the oscillation movement is very short, being only a few degrees, so that on the one hand the "rest time" of the moving parts including the belt is so short that the elastic dynamic deformation cannot subside and that possible vibrations cannot subside. The oscillating movement of the feed parts is now basically caused by the drive pin 17 of the crank mechanism 16, which is correspondingly stationary for only a few degrees.

Es wird nun insbesondere auf die Figuren 3 und 4 Bezug genommen. Der Kurbeltrieb 16 ist exzentrisch in einer Zwischenwelle 15 gelagert und weist einen stirnverzahnten Abschnitt 32 auf, der mit einer Innenverzahnung 33 der Zwischenwelle 15 kämmt, derart, dass beim Rotieren der Zwischenwelle 15 der Antriebszapfen 17 in bekannter Weise lediglich eine hin- und hergehende oszillierende Bewegung ausführt. Die Zwischenwelle 15 ist ihrerseits über Wälzlager 34, 35 in einem Schlitten 18 gelagert. Dieser Schlitten 18 ist in Führungsstücken 36, 37 geradlinig hin- und herbewegbar gelagert. Die Bewegbarkeit erfolgt also, bezogen auf die Figur 3, senkrecht zum Zeichnungsblatt gegen den Betrachter hin und von demselben weg.Reference is now made in particular to FIGS. 3 and 4. The crank mechanism 16 is mounted eccentrically in an intermediate shaft 15 and has a spur-toothed section 32 which meshes with an internal toothing 33 of the intermediate shaft 15, such that when the intermediate shaft 15 rotates, the drive pin 17 in a known manner only has a reciprocating oscillating movement executes. The intermediate shaft 15 is in turn supported in a carriage 18 via roller bearings 34, 35. This carriage 18 is supported in guide pieces 36, 37 so that it can be moved back and forth in a straight line. The movability is, with reference to FIG. 3, perpendicular to the drawing sheet towards the viewer and away from the viewer.

Die Zwischenwelle ist bei ihrem links gelegenen Ende mit einer Nockenscheibe 21 verbunden, welche ihrerseits über eine Kreuzscheibe 38 mit der Welle 10 verbunden ist.The intermediate shaft is connected at its left end to a cam disk 21, which in turn is connected to the shaft 10 via a cross disk 38.

Die Nockenscheibe 21 ist zwischen zwei Nockenrollen 19, 19′ (siehe Figur 4) geführt, welche Nockenrollen 19, 19′ ortsfest im Gehäuse 20 gelagert sind. Die Nockenscheibe 21 weist eine Umfangssteuerfläche, d.h. eine Führungsfläche auf, welche allgemein kreisförmig ist und einen Vorsprungsabschnitt 22 sowie einen diesem diametral gegenüberliegenden Abflachungsabschnitt 23 aufweist. Es ist demgemäss aus der Figur 4 ersichtlich, dass wenn die Nockenscheibe 21 rotiert, sie aufgrund der Nockenrollen 19, 19′ und dem Vorsprungsabschnitt 22 und dem Abflachungsabschnitt 23 eine oszillierende Horizontalbewegung durchführt, welche Bewegung über die Zwischenwelle 15 auf den Schlitten 18 übertragen wird.The cam disk 21 is guided between two cam rollers 19, 19 '(see FIG. 4), which cam rollers 19, 19' are mounted in a stationary manner in the housing 20. The cam disk 21 has a circumferential control surface, ie a guide surface, which is generally circular and a projection section 22 and a diametrical one has opposite flattened portion 23. It is accordingly apparent from Figure 4 that when the cam disc 21 rotates, it performs an oscillating horizontal movement due to the cam rollers 19, 19 'and the projection portion 22 and the flattened portion 23, which movement is transmitted to the carriage 18 via the intermediate shaft 15.

Es ist somit ersichtlich (siehe Figur 3), dass die Oszillationsbewegung des Schlittens 18 die Oszillationsbewegung des Antriebszapfens 17 überlagert. Dabei ist die Nockenscheibe 21, insbesondere ihr Vorsprungsabschnitt 22 und Abflachungsabschnitt 23 derart ausgebildet und angeordnet, dass die Zwischenwelle 15 eine zum Antriebszapfen 17 des Kurbeltriebs entgegengesetzt gerichtete Bewegung und dieselbe zusätzlich über einen grösseren Kurbelwinkel durchführt. Dabei ist nun die Summe dieser beiden Bewegungen in den Abschnitten der jeweiligen Endlagen O, d.h. der Antriebszapfen 17 steht nun während einer längeren Zeitspanne (z.B. 30° Kurbelwinkel) still. Damit können die dynamischen Deformationen bei den hohen Drehzahlen und mögliche Schwingungen von Vorrichtungsteilen und dem vorzuschiebenden bandförmigen Werkstück vor dem eigentlichen Stanzen bzw. Prägen abklingen, und weiter können diejenigen Arbeitsteile, die zum Klemmen des bandförmigen Werkstückes gegen dieses abgesenkt werden und auf dasselbe auftreffen, langsamer abgesenkt werden, so dass eine kleine Auftreffgeschwindigkeit bzw. kleinere Schlagenergie entsteht, womit dem plastischen Verformen des bandförmigen Werkstückes entgegengewirkt ist.It can thus be seen (see FIG. 3) that the oscillating movement of the slide 18 overlaps the oscillating movement of the drive pin 17. The cam disk 21, in particular its projection section 22 and flattened section 23, is designed and arranged in such a way that the intermediate shaft 15 performs a movement opposite to the drive journal 17 of the crank mechanism and also performs the same over a larger crank angle. The sum of these two movements in the sections of the respective end positions O, i.e. the drive pin 17 is now stationary for a longer period (e.g. 30 ° crank angle). This allows the dynamic deformations at the high speeds and possible vibrations of device parts and the band-shaped workpiece to be advanced to decay before the actual punching or embossing, and furthermore those work parts that are lowered against the band-shaped workpiece and hit it, can slow down be lowered, so that a low impact speed or lower impact energy is produced, which counteracts the plastic deformation of the band-shaped workpiece.

Claims (3)

  1. Apparatus for a stepwise feeding of a strip shaped workpiece, with two feeding units (1-6; 7-9) intended to clampingly receive a respective workpiece therebetween, of which the first feeding unit (1-6) is periodically movable towards the second feeding unit (7-9) for clamping the workpiece and away from same for releasing the workpiece, which two feeding units (1-6; 7-9) are driven by a shaft (10) common to both via a respective intermediate drive, characterized in that the intermediate drive of the first feeding unit (1-6) comprises a cam drive (11, 12, 13) driven by the common shaft (10) which is connected via a transmitting linkage (14) to the first feeding unit (1-6) and determines the course of the movement thereof towards the second feeding unit (7-9) and away from same, and in that the intermediate drive of the second feeding unit (7-9) comprises a crank drive assembly (16) supported in an intermediate shaft (15) drivingly mounted to the common shaft (10) in such a manner that its driving pivot (17) for the driving of the second feeding unit (7-9) executes in operation an oscillating movement, which intermediate shaft (15) is supported in a slide (18) which is oscillatable oppositely to the oscillating movement of the driving pivot (17).
  2. Apparatus according to claim 1, characterized in that the intermediate shaft (15) comprises an oscillatory cam disk (21) supported via at least one stationary cam follower (19) against the frame (20) of the apparatus, which causes via the intermediate shaft (15) the movement of the slide oscillating oppositely to the driving pivot (17).
  3. Apparatus according to claim 2, characterized in that the cam disk (21) comprises a circumferential length abutting the respective cam follower (19) having a projecting portion (22) and a flattened portion (23) located diametrically opposite of same, such that the slide (18) oscillates oppositely only within the range of the end position of the oscillating movement of the driving pivot (17) of the crank drive assembly (16) relative thereto.
EP90116857A 1989-12-11 1990-09-03 Device for feeding a strip material step by step Expired - Lifetime EP0432373B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4440/89 1989-12-11
CH4440/89A CH680056A5 (en) 1989-12-11 1989-12-11

Publications (2)

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EP0432373A1 EP0432373A1 (en) 1991-06-19
EP0432373B1 true EP0432373B1 (en) 1993-01-13

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EP90116857A Expired - Lifetime EP0432373B1 (en) 1989-12-11 1990-09-03 Device for feeding a strip material step by step

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US (1) US5110026A (en)
EP (1) EP0432373B1 (en)
JP (1) JPH03189031A (en)
CH (1) CH680056A5 (en)
DE (1) DE59000759D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04313556A (en) * 1990-11-30 1992-11-05 Sankyo Seisakusho:Kk Roll field
US5287658A (en) * 1991-06-04 1994-02-22 Seva Polishing machine having combined alternating translational and rotational tool motion
JPH0719631Y2 (en) * 1992-02-28 1995-05-10 株式会社山田ドビー Pressing device for upper roll in roll feeder
DE19727890A1 (en) 1997-07-01 1999-01-07 Bayer Ag Process for the preparation of 2,4,5-trifluorobenzonitrile
ES2296851T3 (en) * 2002-08-22 2008-05-01 Bruderer Ag ADVANCE DEVICE FOR DRIVING INTERMITTENTLY A GROSS PART IN THE FORM OF A TAPE TO A PRESS AND PROCEDURE FOR OPERATION.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1362224A (en) * 1963-07-01 1964-05-29 Schuler L Ag Drive for advance cylinders
CH543932A (en) * 1971-10-01 1973-11-15 Bruderer Ag Device for gradually advancing a workpiece
US4156387A (en) * 1974-09-03 1979-05-29 Bruderer Ag Apparatus for mass compensation at a machine driven by a crank drive
DE7834958U1 (en) * 1978-11-24 1987-10-15 Bihler, Otto, 8959 Halblech, Post Trauchgau, De
DE3578148D1 (en) * 1985-09-03 1990-07-19 Aida Eng Ltd DEVICE FOR DYNAMIC BALANCING FOR PRESS.
US4979476A (en) * 1990-05-21 1990-12-25 Islas John J Counter-balance system for counter-rotating twin-shaft reciprocating engine

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CH680056A5 (en) 1992-06-15
DE59000759D1 (en) 1993-02-25
JPH03189031A (en) 1991-08-19
EP0432373A1 (en) 1991-06-19
US5110026A (en) 1992-05-05

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