EP0723842B1 - Device for cutting sheet material - Google Patents

Device for cutting sheet material Download PDF

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Publication number
EP0723842B1
EP0723842B1 EP95119684A EP95119684A EP0723842B1 EP 0723842 B1 EP0723842 B1 EP 0723842B1 EP 95119684 A EP95119684 A EP 95119684A EP 95119684 A EP95119684 A EP 95119684A EP 0723842 B1 EP0723842 B1 EP 0723842B1
Authority
EP
European Patent Office
Prior art keywords
locking element
pressure bar
spring
lever
bent angle
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
EP95119684A
Other languages
German (de)
French (fr)
Other versions
EP0723842A1 (en
Inventor
Helmut Gross
Adolf Rasch
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.)
Adolf Mohr Maschinenfabrik GmbH and Co KG
Original Assignee
Adolf Mohr 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
Application filed by Adolf Mohr Maschinenfabrik GmbH and Co KG filed Critical Adolf Mohr Maschinenfabrik GmbH and Co KG
Publication of EP0723842A1 publication Critical patent/EP0723842A1/en
Application granted granted Critical
Publication of EP0723842B1 publication Critical patent/EP0723842B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B26D7/02—Means for holding or positioning work with clamping means
    • B26D7/025—Means for holding or positioning work with clamping means acting upon planar surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/22—Safety devices specially adapted for cutting machines
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/01—Safety devices
    • 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
    • Y10T83/00—Cutting
    • Y10T83/566—Interrelated tool actuating means and means to actuate work immobilizer
    • Y10T83/5669—Work clamp
    • 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
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/7533—With biasing or counterbalancing means
    • 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
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/7553—Including means to retain clamp jaw in position
    • 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
    • Y10T83/00—Cutting
    • Y10T83/748—With work immobilizer
    • Y10T83/7487—Means to clamp work
    • Y10T83/756—Self-locking drive means
    • 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
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9473—For rectilinearly reciprocating tool
    • Y10T83/9478—Tool is single element reciprocable generally perpendicularly to elongate cutting edge [e.g., shear, etc.]

Definitions

  • the invention relates to a device for cutting leafy good, with a table to hold the good, a Knife for cutting the good and one on the one to be cut Easily lowerable press beam, with a drive to lower the Press bar and a return spring for lifting the press bar are provided.
  • a device for cutting sheet-like material with a Table for receiving the goods, a knife for cutting the Good and a press beam that can be lowered onto the material to be cut is known for example from EP 0 056 874 A1.
  • a cutting device is used to lower the Press beam on the material to be cut by means of a drive, while a return spring with the drive not activated Press bar lifts.
  • DE-A-31 16 292 is a device according to the preamble of claim 1, to reduce the Press beam pressure force on a stack of paper in a paper cutter known during the cut hint.
  • a safety gear is provided which locks the press beam when the return spring breaks.
  • locked is to be understood comprehensively.
  • the Locking should be achieved that the press beam immediately after the return spring breaks or after replacement slight descent path is fixed to a pitch of the press beam on the material or extremities to be cut Prevent operator effectively. It is preferred when locking the press beam around its locking, whereby the setting of the press beam after a short distance is carried out mechanically in a particularly simple manner. It is especially thought that the press beam indirectly rested. On the other hand, it is also conceivable to use the press beam to lock directly, for example hydraulically.
  • An advantageous design provides that the locking element pivoted in the drive train between two stops is, the return spring on a stationary component of the Cutting device and the locking element attacks, as well as a Release spring with lower spring force against the direction of force the return spring acts on the locking element.
  • the return spring With intact Return spring pulls the locking element against one Stop, the path of movement of the locking element permanently runs outside the stationary stop part. Breaks the Return spring, and thus becomes ineffective, swings the release spring the locking element against the other stop, which in the Path of movement of the locking element now the stationary Stop part protrudes.
  • the safety gear can be placed anywhere on the drive train be arranged to the press beam and could in principle also be assigned directly to the press beam.
  • a preferred one Design provides that the press beam in one Machine stand is guided and the drive train of the press beam essentially by both ends of the pressure beam on this attacking tie rods, attacking at the other end of the tie rods, angle levers pivoted in the machine stand, a rod connecting the angle lever and one with a the angle lever cooperating, actual drive is formed is, the return spring on the machine stand and in the Connecting rod attacks the locking element.
  • a particularly simple design of the locking element results if this is designed as an angular element, the in its corner area is pivotally mounted in the connecting rod is, and on a lever of the Winkelemementes in the area of free lever end engages the return spring and the free end the other lever of the angle element in operative connection with the stationary stop part can be brought.
  • a rectangular one Arrangement of the lever of the angle element can thus be large Lever arm engage the return spring and it's the other Lever arm in the event of breakage of the return spring when opening essentially only compressive forces on the stationary stop part exposed.
  • the release spring is convenient in the connecting rod stored and designed as a leg spring, one of which Thighs on the connecting rod and its other Leg on the locking element between the pivot axis of the locking element and the point of application of the return spring supports.
  • the two stops of the locking element can for example by one in the connecting rod Cone be formed, which is at a distance from the pivot axis of the Locking element arranged in this, in the pivoting direction of the locking element extending oblong hole.
  • the stationary stop part a locking backdrop to the catch position the pressure beam dependent engagement of the locking lever having.
  • the background is that in the two angle levers mounted connecting rod depending on the position of the Bar is moved on an arc, with the consequence that the locking lever when the return spring is not broken makes a corresponding movement.
  • the latching backdrop is with the large number of stop stages for the locking element, in almost constant distance to the respective locking lever position arranged.
  • Figure 1 illustrates the basic structure of a Cutting machine for cutting sheet-like material, in one Plane perpendicular to the feed direction of the material to be cut or parallel to the travel plane of the press beam and the cutting knife seen. Only those essential to the invention are shown Parts.
  • FIG. 1 is in one Machine stand 1 a table 12 with a horizontally aligned Table surface 13 stored, the inclusion of sheet Cutting material 2 is used.
  • the press beam 11 in two parallel, vertically oriented Guides 14 is the press beam 11 in the direction of the double arrows Z can be lowered or raised, the maximum raised in FIG. 1 Position of the press beam 11 is shown, which shows is that there is a distance between the surface of the material to be cut 2 and the lower edge 15 of the press beam 11 remains.
  • angle levers 4 laterally, two parallel tie rods engage on the press beam 11 3 on, which are pivotally connected to angle levers 4, the in turn are pivotally mounted in the machine stand 1.
  • the other end of the respective angle lever 4 is pivotable with a connecting rod 5 connected, so that the two Drawbars 3 kinematically couples so that synchronism of the press beam 11 is created.
  • One of the angle levers 4 has a third having the function of an operating arm Arm 4a, whose free end in the travel of the piston 10a of a hydraulic pressure cylinder 10 that projects in the machine stand 1 is stored.
  • the return spring 6 is there formed as a tensile force coil spring.
  • the structure of the safety device according to the invention is special the representation of Figures 2 and 3:
  • the Connecting rod 5 is concrete by two parallel to each other arranged rods 5a and 5b formed, which are not between them only the free lever arms of the angle lever 4 can be pivoted record, but also designed as an angle element 8 Locking element.
  • An axially secured bolt penetrates 16 aligned holes in the two rods 5a and 5b and with Play a hole in the angular area of the angular element 8.
  • In Distance to the bolt 16 passes through another axially secured Bolt 17 the rods 5a and 5b as well as with a concentric one to the bolt 16 arranged slot 18 in the substantially vertically oriented lever 8a of the angle element 8.
  • leg spring 7 causes the angle element 8 in the position shown in Figure 2 with dashed lines is pivoted, the bolt 17 now in the area of the other End of the elongated hole 18 abuts the lever 8a.
  • the figures illustrate that with the lever 8b of the angle element 8 a stored in the machine stand 1, thus stationary Stop part 9 cooperates, which on its lever 8b facing side is designed as a locking link 20.
  • the in Area of the locking link not shown contour line 21 of the Rastkulisse 20 is arranged inclined so that at the Angular element 8 acting return spring 6, the free end 8c at every position of the press beam 11 the same, small Has distance to the contour line 21. Breaks the return spring 6, is about the leg spring 7, the angle element 8 in the Dashed position pivoted, the free end 8c of Lever 8b comes against one of the steps 22 of the locking link 20 and prevents the connecting rod 5 from further in Direction of arrow Y moves.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Details Of Cutting Devices (AREA)
  • Sawing (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Schneiden von blättrigem Gut, mit einem Tisch zur Aufnahme des Gutes, einem Messer zum Schneiden des Gutes und einem auf das zu schneidende Gut absenkbaren Preßbalken, wobei ein Antrieb zum Absenken des Preßbalkens und eine Rückholfeder zum Anheben des Preßbalkens vorgesehen sind. The invention relates to a device for cutting leafy good, with a table to hold the good, a Knife for cutting the good and one on the one to be cut Easily lowerable press beam, with a drive to lower the Press bar and a return spring for lifting the press bar are provided.

Eine Vorrichtung zum Schneiden von blattförmigem Gut mit einem Tisch zur Aufnahme des Gutes, einem Messer zum Schneiden des Gutes und einem auf das zu schneidende Gut absenkbaren Preßbalken, ist beispielsweise aus der EP 0 056 874 A1 bekannt. Bei einer derartigen Schneidvorrichtung erfolgt das Absenken des Preßbalkens auf das zu schneidende Gut mittels eines Antriebes, während eine Rückholfeder bei nicht aktiviertem Antrieb den Preßbalken anhebt.A device for cutting sheet-like material with a Table for receiving the goods, a knife for cutting the Good and a press beam that can be lowered onto the material to be cut, is known for example from EP 0 056 874 A1. At Such a cutting device is used to lower the Press beam on the material to be cut by means of a drive, while a return spring with the drive not activated Press bar lifts.

In der Praxis besteht bei derartigen Schneidvorrichtungen die Möglichkeit, den jeweiligen Schnitt anzudeuten. Hierzu kann von dem Bediener der Vorrichtung der Preßbalken langsam in Richtung des zu schneidenden Gutes abgesenkt werden, womit sich aufgrund der Nähe des Preßbalkens zur Schneidgutoberfläche und der Parallelität der unteren Preßbalkenvorderkante zum Schneidmesser das Schneidgut optimal bezuglich der Schneidebene ausrichten läßt. Während der Schnittandeutung läßt es sich in aller Regel nicht vermeiden, daß die Bedienperson den zu schneidenden Stapel unter dem Preßbalken manipuliert. Um eine Gefährdung der Bedienperson auszuschließen, insbesondere unter dem Aspekt der Quetschung der Finger, ist während der Schnittandeutung die Preßkraft des Preßbalkens herabgesetzt. Eine Gefährdung der Bedienperson ergibt sich allerdings dann, wenn beim Anheben des Preßbalkens, somit bei nicht aktivem Antrieb und nur wirksamer Rückholfeder diese bricht, wodurch der Preßbalken unter seinem erheblichen Eigengewicht auf den zu schneidenden Stapel fällt. Ernsthafte Verletzungen der Bedienperson im Gliedmaßenbereich können in diesem Fall nicht ausgeschlossen werden.In practice there is such a cutting device Possibility to indicate the respective cut. This can be done by the operator of the device the press beam slowly in the direction of the material to be cut, which is due to the proximity of the press beam to the surface of the material to be cut and the Parallelism of the lower press beam front edge to the cutting knife Align the material to be cut optimally with respect to the cutting plane leaves. As a rule, it can be indicated during the cut do not prevent the operator from selecting the stack to be cut manipulated under the beam. To endanger the Exclude operator, especially under the aspect of Pinching the fingers is the one during the cut Pressing force of the press bar reduced. A threat to the Operator arises, however, if when lifting the Press bar, thus when the drive is not active and only more effective Return spring breaks, causing the press beam under his considerable weight falls on the stack to be cut. Serious limb injuries to the operator cannot be excluded in this case.

Aus der DE-A-31 16 292 ist eine Vorrichtung gemäß dem Oberbegriff des Anspruchs 1, zur Herabsetzung der Preßbalkendruckkraft auf einen Papierstapel bei einer Papierschneidemaschine während der Schnittandeutung bekannt.DE-A-31 16 292 is a device according to the preamble of claim 1, to reduce the Press beam pressure force on a stack of paper in a paper cutter known during the cut hint.

Es ist Aufgabe der vorliegenden Erfindung, eine Vorrichtung der eingangs genannten Art so weiter zu bilden, daß eine Gefährdung einer Bedienperson bei einem Bruch der Rückholfeder wirksam vermieden wird.It is an object of the present invention to provide a device the kind mentioned at the outset so that a hazard an operator effective if the return spring breaks is avoided.

Gelöst wird die Aufgabe bei einer Vorrichtung der eingangs genannten Art dadurch, daß eine Fangvorrichtung vorgesehen ist, die bei Bruch der Rückholfeder den Preßbalken arretiert. Der Begriff arretiert ist dabei umfassend zu verstehen. Durch das Arretieren soll erreicht werden, daß der Preßbalken unmittelbar nach dem Bruch der Rückholfeder oder nach Zurücklegen einer geringfüfigen Absenkwegstrecke fixiert wird, um ein Aufschlagen des Preßbalkens auf das zu schneidende Gut bzw. Extremitäten der Bedienperson wirksam zu verhindern. Bevorzugt handelt es sich bei dem Arretieren des Preßbalkens um dessen Rastieren, wobei das Festlegen des Preßbalkens nach einer geringen Wegstrecke auf besonders einfache Art und Weise mechanisch erfolgt. Es ist insbesondere daran gedacht, daß der Preßbalken mittelbar rastiert. Andererseits ist es auch denkbar, den Preßbalken direkt zu arretieren, beispielsweise hydraulisch. So wird der Preßbalken in aller Regel hydraulisch abgesenkt, wobei das Hydrauliksystem des Preßbalkens beim Anheben des Preßbalkens druckentlastet ist. Ein Bruch der Rückholfeder könnte als Druckerhöhung im Hydrauliksystem dargestellt werden, mit der Folge, daß unmittelbar ein Rückschlagventil aktiviert wird, das die Absenkbewegung des Preßbalkens hydraulisch sperrt.The task is solved with a device of the beginning mentioned type in that a safety gear is provided which locks the press beam when the return spring breaks. Of the The term locked is to be understood comprehensively. By the Locking should be achieved that the press beam immediately after the return spring breaks or after replacement slight descent path is fixed to a pitch of the press beam on the material or extremities to be cut Prevent operator effectively. It is preferred when locking the press beam around its locking, whereby the setting of the press beam after a short distance is carried out mechanically in a particularly simple manner. It is especially thought that the press beam indirectly rested. On the other hand, it is also conceivable to use the press beam to lock directly, for example hydraulically. So it will Press beam usually lowered hydraulically, which Hydraulic system of the press beam when lifting the press beam is relieved of pressure. A break in the return spring could increase pressure are represented in the hydraulic system, with the result that a check valve is activated immediately, the Lowering movement of the press beam locks hydraulically.

Konstruktiv besonders einfach läßt sich die Arretierung des Preßbalkens bei Bruch der Rückholfeder erreichen, wenn die Fangvorrichtung ein im Antriebsstrang zum Preßbalken angeordnetes Rastierelement aufweist, in dessen Bewegungsweg bei Federbruch ein stationäres Anschlagteil ragt. Bei intakter Rückholfeder gelangt das zusammen mit dem Preßbalken bewegbare Rastierelement nicht in Kontakt mit dem Anschlagteil, während der Bruch der Rückholfeder zu einer Veränderung der Stellung des Rastierelementes führt, mit der Konsequenz, daß das stationäre Anschlagteil nunmehr in den Bewegungsweg des Rastierelementes ragt. Sobald das Rastierelement das Anschlagteil kontaktiert, ist die Abwärtsbewegung des Preßbalkens beendet, der damit in dieser Position gefangen ist.The locking of the Reach the press beam if the return spring breaks, if the Safety gear arranged in the drive train for the press beam Has locking element in the path of movement at Spring breakage protrudes from a stationary stop part. With intact Return spring that moves together with the press beam Locking element not in contact with the stop part while the break of the return spring to a change in the position of the Latching element leads, with the consequence that the stationary Stop part now in the path of movement of the locking element protrudes. As soon as the locking element contacts the stop part, the downward movement of the press beam is finished, the in this position is caught.

Eine vorteilhafte Gestaltung sieht vor, daß das Rastierelement im Antriebsstrang zwischen zwei Anschlägen schwenkbar gelagert ist, wobei die Rückholfeder an einem stationären Bauteil der Schneidvorrichtung und dem Rastierelement angreift, sowie eine Auslösefeder geringerer Federkraft entgegen der Kraftrichtung der Rückholfeder das Rastierelement beaufschlagt. Bei intakter Rückholfeder zieht diese das Rastierelement gegen den einen Anschlag, wobei der Bewegungsweg des Rastierelementes dauerhaft außerhalb des stationären Anschlagteiles verläuft. Bricht die Rückholfeder, und wird damit unwirksam, schwenkt die Auslösefeder das Rastierelement gegen den anderen Anschlag, womit in den Bewegungsweg des Rastierelementes nunmehr das stationäre Anschlagteil ragt.An advantageous design provides that the locking element pivoted in the drive train between two stops is, the return spring on a stationary component of the Cutting device and the locking element attacks, as well as a Release spring with lower spring force against the direction of force the return spring acts on the locking element. With intact Return spring pulls the locking element against one Stop, the path of movement of the locking element permanently runs outside the stationary stop part. Breaks the Return spring, and thus becomes ineffective, swings the release spring the locking element against the other stop, which in the Path of movement of the locking element now the stationary Stop part protrudes.

Die Fangvorrichtung kann an beliebiger Stelle des Antriebsstranges zum Preßbalken angeordnet sein und könnte grundsätzlich auch unmittelbar dem Preßbalken zugeordnet sein. Eine bevorzugte Gestaltung sieht allerdings vor, daß der Preßbalken in einem Maschinenständer geführt ist und der Antriebsstrang des Preßbalkens im wesentlichen durch beidendig des Preßbalkens an diesem angreifende Zugstangen, am anderen Ende der Zugstangen angreifende, im Maschinenständer schwenkbar gelagerte Winkelhebel, eine die Winkelhebel verbindende Stange sowie einen mit einem der Winkelhebel zusammenwirkenden, eigentlichen Antrieb gebildet ist, wobei die Rückholfeder am Maschinenständer und dem in der Verbindungsstange gelagerten Rastierelement angreift. In diesem Fall ist das Rastierelement der den Gleichlauf von Preßbalken und Zugstangen bewirkenden Verbindungsstange zugeordnet.The safety gear can be placed anywhere on the drive train be arranged to the press beam and could in principle also be assigned directly to the press beam. A preferred one Design, however, provides that the press beam in one Machine stand is guided and the drive train of the press beam essentially by both ends of the pressure beam on this attacking tie rods, attacking at the other end of the tie rods, angle levers pivoted in the machine stand, a rod connecting the angle lever and one with a the angle lever cooperating, actual drive is formed is, the return spring on the machine stand and in the Connecting rod attacks the locking element. In this Case is the locking element of the synchronism of the press beam and tie rods effecting connecting rod assigned.

Eine besonders einfache Ausbildung des Rastierelementes ergibt sich, wenn dieses als Winkelelement ausgebildet ist, das in seinem Eckbereich schwenkbar in der Verbindungsstange gelagert ist, sowie an einem Hebel des Winkelemementes im Bereich des freien Hebelendes die Rückholfeder angreift und das freie Ende des anderen Hebels des Winkelelementes in Wirkverbindung mit dem stationären Anschlagteil bringbar ist. Bei einer rechteckigen Anordnung der Hebel des Winkelelementes kann somit mit großem Hebelarm die Rückholfeder angreifen und es ist der andere Hebelarm im Fall des Bruches der Rückholfeder beim Aufschlagen auf das stationäre Anschlagteil im wesentlichen nur Druckkräften ausgesetzt. Die Auslösefeder ist zweckmäßig in der Verbindungsstange gelagert und als Schenkelfeder ausgebildet, deren einer Schenkel sich an der Verbindungsstange und deren anderer Schenkel sich an dem Rastierelement zwischen der Schwenkachse des Rastierelementes und dem Angriffspunkt der Rückholfeder abstützt. Die beiden Anschläge des Rastierelementes können beispielsweise durch einen in der Verbindungsstange gelagerten Zapfen gebildet sein, der in Abstand zur Schwenkachse des Rastierelementes ein in diesem angeordnetes, in Schwenkrichtung des Rastierelementes verlaufendes Langloch durchsetzt.A particularly simple design of the locking element results if this is designed as an angular element, the in its corner area is pivotally mounted in the connecting rod is, and on a lever of the Winkelemementes in the area of free lever end engages the return spring and the free end the other lever of the angle element in operative connection with the stationary stop part can be brought. With a rectangular one Arrangement of the lever of the angle element can thus be large Lever arm engage the return spring and it's the other Lever arm in the event of breakage of the return spring when opening essentially only compressive forces on the stationary stop part exposed. The release spring is convenient in the connecting rod stored and designed as a leg spring, one of which Thighs on the connecting rod and its other Leg on the locking element between the pivot axis of the locking element and the point of application of the return spring supports. The two stops of the locking element can for example by one in the connecting rod Cone be formed, which is at a distance from the pivot axis of the Locking element arranged in this, in the pivoting direction of the locking element extending oblong hole.

Gemäß einer besonderen Ausgestaltung ist vorgesehen, daß das stationäre Anschlagteil eine Rastkulisse zum von der Fangposition des Preßbalkens abhängigen Eingriff des Rastierhebels aufweist. Hintergrund ist, daß die in den beiden Winkelhebeln gelagerte Verbindungsstange in Abhängigheit von der Position des Balkens auf einem Kreisbogen bewegt wird, mit der Konsequenz, daß auch der Rastierhebel bei nicht gebrochener Rückholfeder eine entsprechende Bewegung vollführt. Um bei jeder beliebigen Position des Preßbalkens dessen kurzzeitiges Arretieren beim Brechen der Rückholfeder zu gewährleisten, ist die Rastkulisse, mit der Vielzahl von Anschlagstufen für das Rastierelement, in nahezu gleichbleibendem Abstand zur jeweiligen Rastierhebelposition angeordnet.According to a special embodiment it is provided that the stationary stop part a locking backdrop to the catch position the pressure beam dependent engagement of the locking lever having. The background is that in the two angle levers mounted connecting rod depending on the position of the Bar is moved on an arc, with the consequence that the locking lever when the return spring is not broken makes a corresponding movement. To at any Position of the press beam whose brief locking when To ensure the return spring breaks, the latching backdrop is with the large number of stop stages for the locking element, in almost constant distance to the respective locking lever position arranged.

Weitere Merkmale der Erfindung sind in den Unteransprüchen, der Beschreibung der Figuren und den Figuren selbst dargestellt, wobei bemerkt wird, daß alle Merkmale und Einzelmerkmale erfindungswesentlich sind.Further features of the invention are in the dependent claims Description of the figures and the figures themselves, it being noted that all features and individual features are essential to the invention.

In den Figuren ist die Erfindung anhand eines Ausführungsbeispieles dargestellt, ohne hierauf beschränkt zu sein. Es stellt dar:

Figur 1
eine schematische Darstellung einer Vorrichtung zum Schneiden von blattförmigem Gut,
Figur 2
die in Figur 1 gezeigte Einzelheit "x" in vergrößertem Maßstab und
Figur 3
einen Schnitt gemäß der Linie A-A in Figur 2.
The invention is shown in the figures using an exemplary embodiment, without being limited thereto. It shows:
Figure 1
1 shows a schematic representation of a device for cutting sheet-like material,
Figure 2
the detail "x" shown in Figure 1 on an enlarged scale and
Figure 3
a section along the line AA in Figure 2.

Figur 1 veranschaulicht den grundsätzlichen Aufbau einer Schneidemaschine zum Schneiden von blattförmigem Gut, in einer Ebene senkrecht zur Vorschubrichtung des zu schneidenden Gutes bzw. parallel zur Verfahrebene des Preßbalkens und des Schneidmessers gesehen. Gezeigt sind dabei nur die erfindungswesentlichen Teile.Figure 1 illustrates the basic structure of a Cutting machine for cutting sheet-like material, in one Plane perpendicular to the feed direction of the material to be cut or parallel to the travel plane of the press beam and the cutting knife seen. Only those essential to the invention are shown Parts.

Wie der Darstellung der Figur 1 zu entnehmen ist, ist in einem Maschinenständer 1 ein Tisch 12 mit horizontal ausgerichteter Tischfläche 13 gelagert, der der Aufnahme von blattförmigem Schneidgut 2 dient. In zwei parallelen, senkrecht orientierten Führungen 14 ist der Preßbalken 11 in Richtung der Doppelpfeile Z absenkbar bzw. anhebbar, wobei in Figur 1 die maximal angehobene Position des Preßbalkens 11 dargestellt ist, womit ersichtlich ist, daß ein Abstand zwischen der Oberfläche des Schneidgutes 2 und der Unterkante 15 des Preßbalkens 11 verbleibt.As can be seen from the illustration in FIG. 1, is in one Machine stand 1 a table 12 with a horizontally aligned Table surface 13 stored, the inclusion of sheet Cutting material 2 is used. In two parallel, vertically oriented Guides 14 is the press beam 11 in the direction of the double arrows Z can be lowered or raised, the maximum raised in FIG. 1 Position of the press beam 11 is shown, which shows is that there is a distance between the surface of the material to be cut 2 and the lower edge 15 of the press beam 11 remains.

Seitlich greifen an dem Preßbalken 11 zwei parallele Zugstangen 3 an, die schwenkbar mit Winkelhebeln 4 verbunden sind, die ihrerseits schwenkbar im Maschinenständer 1 gelagert sind. Das andere Ende des jeweiligen Winkelhebels 4 ist schwenkbar mit einer Verbindungsstange 5 verbunden, die damit die beiden Zugstangen 3 kinematisch so koppelt, daß eine Gleichlaufführung des Preßbalkens 11 geschaffen ist. Einer der Winkelhebel 4 weist einen die Funktion eines Betätigungsarmes aufweisenden dritten Arm 4a auf, dessen freies Ende in den Stellweg des Kolbens 10a eines hydraulischen Druckzylinders 10 ragt, der im Maschinenständer 1 gelagert ist. Beim Ausfahren des Kolbens 10a wird damit der an diesem anliegende Betätigungsarm 4a des dem Druckzylinder 10 benachbarten Winkelhebels 4 verschwenkt und aufgrund der starren Einheit des Winkelhebels 4 dieser insgesamt, mit der Folge, daß dieser Winkelhebel 4 einerseits die ihm zugeordnete Zugstange 3 nach unten zieht, andererseits seine Bewegung über die Verbindungsstange 5 auf den anderen Winkelhebel 4 übertragen wird, der die diesem zugeordnete andere Zugstange 3 nach unten zieht. In der Konsequenz wird aufgrund der synchronen Bewegung der beiden Zugstangen 3 der Preßbalken 11 nach unten gezogen, beispielsweise zum Zweck der Schnittandeutung. Angehoben wird der Preßbalken 11, indem der Druckzylinder 10 druckentlastet wird und eine einerseits am Maschinenständer 1, andererseits mittelbar an der Verbindungsstange 5 angreifende Rückholfeder 6 die Verbindungsstange beaufschlagt, in dem Sinne, daß die Winkelhebel 4 entgegen der Beaufschlagungsrichtung bei aktiviertem Drucksystem verschwenkt werden. Die Rückholfeder 6 ist dabei als eine Zugkraft aufbringende Spiralfeder ausgebildet.Laterally, two parallel tie rods engage on the press beam 11 3 on, which are pivotally connected to angle levers 4, the in turn are pivotally mounted in the machine stand 1. The other end of the respective angle lever 4 is pivotable with a connecting rod 5 connected, so that the two Drawbars 3 kinematically couples so that synchronism of the press beam 11 is created. One of the angle levers 4 has a third having the function of an operating arm Arm 4a, whose free end in the travel of the piston 10a of a hydraulic pressure cylinder 10 that projects in the machine stand 1 is stored. When the piston 10a is extended so that the actuating arm 4a of the pressure cylinder resting thereon 10 adjacent angle lever 4 pivoted and due the rigid unit of the angle lever 4 this total, with the Consequence that this angle lever 4 on the one hand the one assigned to it Pull rod 3 pulls down, on the other hand, its movement over transfer the connecting rod 5 to the other angle lever 4 the other associated tie rod 3 down pulls. In consequence, due to the synchronous movement the two tie rods 3 of the press beam 11 are pulled down, for example for the purpose of suggesting cuts. Is raised the pressure beam 11 by the pressure cylinder 10 relieves pressure and one on the machine stand 1, on the other Return spring 6 acting indirectly on the connecting rod 5 acted on the connecting rod, in the sense that the Angle lever 4 against the direction of action when activated Printing system can be pivoted. The return spring 6 is there formed as a tensile force coil spring.

Der Aufbau der erfindungsgemäßen Fangvorrichtung ist insbesondere der Darstellung der Figuren 2 und 3 zu entnehmen: Die Verbindungsstange 5 ist konkret durch zwei parallel zueinander angeordnete Stangen 5a und 5b gebildet, die zwischen sich nicht nur die jeweils freien Hebelarme der Winkelhebel 4 schwenkbar aufnehmen, sondern auch ein als Winkelelement 8 ausgebildetes Rastierelement. Hierbei durchsetzt ein axial gesicherter Bolzen 16 fluchtende Bohrungen in den beiden Stangen 5a und 5b und mit Spiel eine Bohrung im Winkelbereich des Winkelelementes 8. In Abstand zum Bolzen 16 durchsetzt ein weiterer, axial gesicherter Bolzen 17 die Stangen 5a und 5b sowie mit Spiel ein konzentrisch zum Bolzen 16 angeordnetes Langloch 18 in dem im wesentlichen senkrecht orientierten Hebel 8a des Winkelelementes 8. Im Bereich des im Bolzen 16 abgewandten, freien Endes des Hebels 8a ist in ein Loch des Hebels 8a das Ende 6a der Rückholfeder 6 eingehängt. Auf der der Rückholfeder 6 zugewandten Seite ist ein weiterer Bolzen 19 (siehe Figur 2) axial festgelegt in fluchtenden Bohrungen der beiden Stangen 5a und 5b gehalten und durchsetzt eine Schenkelfeder 7, die sich mit einem Schenkel 7a auf der der Rückholfeder 6 zugewandten Seite der Verbindungsstange 5 und mit dem anderen Schenkel 7b am Hebel 8a des Winkelelementes 8 abstützt. Senkrecht zum Hebel 8a und senkrecht zur Längserstreckung von dessen Lagerbolzen 16a weist das Winkelement 8 einen weiteren Hebel 8b auf.The structure of the safety device according to the invention is special the representation of Figures 2 and 3: The Connecting rod 5 is concrete by two parallel to each other arranged rods 5a and 5b formed, which are not between them only the free lever arms of the angle lever 4 can be pivoted record, but also designed as an angle element 8 Locking element. An axially secured bolt penetrates 16 aligned holes in the two rods 5a and 5b and with Play a hole in the angular area of the angular element 8. In Distance to the bolt 16 passes through another axially secured Bolt 17 the rods 5a and 5b as well as with a concentric one to the bolt 16 arranged slot 18 in the substantially vertically oriented lever 8a of the angle element 8. Im Area of the free end of the lever 8a facing away from the bolt 16 is the end 6a of the return spring 6 in a hole in the lever 8a mounted. On the side facing the return spring 6 is a further bolts 19 (see Figure 2) axially fixed in alignment Bores of the two rods 5a and 5b held and passes through a leg spring 7, which is with a leg 7a on the return spring 6 side of the connecting rod 5 and with the other leg 7b on the lever 8a of the Angular element 8 supports. Vertical to lever 8a and vertical for the longitudinal extension of its bearing pin 16a Angled element 8 has a further lever 8b.

Beim Bewegen des Preßbalkens 11 beschreibt die Verbindungsstange 5 aufgrund der schwenkbaren Lagerung über die beiden Winkelhebel 4 eine Bewegung entlang einer Kreiskontur mit einem Radius der dem Hebelarm der Winkelhebel 4 zwischen der Lagerachse 23 des jeweiligen Winkelhebels 4 und dem Angriffspunkt an der Verbindungsstange 5 entspricht, wobei bei angehobener Stellung des Preßbalkens 11 die Rückholfeder 6 weniger, hingegen bei stärker abgesenkter Stellung des Preßbalkens 11 die Rückholfeder 6 stärker gespannt ist. Die Rückholfeder 6 zieht das Winkelelement 8 in die in Figur 2 mit durchgezogenen Linien verdeutlichte Position, in der der Bolzen 17 an dem einen Ende des Langloches 18 anliegt. Ohne Rückholfeder 6, was dem Fall gleichkommt, daß die Rückholfeder 6 gebrochen und damit außer Wirkung ist, bedingt die Schenkelfeder 7 hingegen, daß das Winkelelement 8 in die in Figur 2 mit strichlierten Linien verdeutlichte Position verschwenkt wird, wobei nun der Bolzen 17 im Bereich des anderen Endes des Langloches 18 am Hebel 8a anliegt.When moving the press beam 11 describes the connecting rod 5 due to the swivel mounting via the two angle levers 4 a movement along a circular contour with a radius of the lever arm of the angle lever 4 between the bearing axis 23 of the respective angle lever 4 and the point of attack on the connecting rod 5 corresponds, with the raised position of the Press bar 11, the return spring 6 less, but with stronger lowered position of the press beam 11, the return spring 6 is more excited. The return spring 6 pulls the angle element 8 into the one shown in FIG. 2 with solid lines Position in which the bolt 17 at one end of the elongated hole 18 is present. Without return spring 6, which is the case that the return spring 6 is broken and is therefore ineffective, on the other hand, the leg spring 7 causes the angle element 8 in the position shown in Figure 2 with dashed lines is pivoted, the bolt 17 now in the area of the other End of the elongated hole 18 abuts the lever 8a.

Die Figuren verdeutlichen, daß mit dem Hebel 8b des Winkelelementes 8 ein im Maschinenständer 1 gelagertes, somit stationäres Anschlagteil 9 zusammenwirkt, das auf seiner dem Hebel 8b zugewandten Seite als Rastkulisse 20 ausgebildet ist. Die im Bereich der Rastkulisse nicht gezeigte Konturlinie 21 der Rastkulisse 20 ist so geneigt angeordnet, daß bei auf das Winkelelement 8 einwirkender Rückholfeder 6 das freie Ende 8c bei jeder Stellung des Preßbalkens 11 denselben, geringen Abstand zur Konturlinie 21 aufweist. Bricht die Rückholfeder 6, wird über die Schenkelfeder 7 das Winkelelement 8 in die gestrichelte Position verschwenkt, wobei das freie Ende 8c des Hebels 8b gegen eine der Stufen 22 der Rastkulisse 20 gelangt und verhindert, daß sich die Verbindungsstange 5 weiter in Richtung des Pfeiles Y bewegt. Aufgrund der Arretierung der Verbindungsstange 5 ergibt sich über die kinematische Koppelung des Preßbalkens 11 dessen Arretierung bei Bruch der Rückholfeder 6. In welche der jeweiligen Stufen 22 der Rastkulisse 20 das Winkelelement 8 einrastet, hängt davon ab, in welcher Position des Preßbalkens 11 die Rückholfeder 6 reißt. In Figur 2 ist mit strichlierten Linien die Arretierung für den Fall gezeigt, daß die Rückholfeder 6 bei fast vollständig angehobenem Preßbalken 11 bricht, würde dies bei weiter abgesenktem Preßbalken 11 geschehen, wäre die Verbindungsstange 5 weiter in Richtung des Pfeiles Y verfahren, so daß das freie Ende 8c des Hebels 8b mit einer der hinteren Stufen 22 der Rastkulisse 20 in Eingriff käme. In der Darstellung der Figur 3 sind aus Gründen des besseren Verständnisses die nicht sichtbaren Stufen 22 mit eingezeichnet.The figures illustrate that with the lever 8b of the angle element 8 a stored in the machine stand 1, thus stationary Stop part 9 cooperates, which on its lever 8b facing side is designed as a locking link 20. The in Area of the locking link not shown contour line 21 of the Rastkulisse 20 is arranged inclined so that at the Angular element 8 acting return spring 6, the free end 8c at every position of the press beam 11 the same, small Has distance to the contour line 21. Breaks the return spring 6, is about the leg spring 7, the angle element 8 in the Dashed position pivoted, the free end 8c of Lever 8b comes against one of the steps 22 of the locking link 20 and prevents the connecting rod 5 from further in Direction of arrow Y moves. Due to the locking of the Connecting rod 5 results from the kinematic coupling of the press beam 11 whose locking in the event of breakage of the return spring 6. In which of the respective stages 22 of the locking link 20 the Angle element 8 engages depends on the position of the press beam 11, the return spring 6 tears. In Figure 2 is with dashed lines shown the lock in the event that the return spring 6 with the press beam almost completely raised 11 breaks, this would be with the press beam 11 lowered further would happen, the connecting rod 5 would continue in the direction of Move arrow Y so that the free end 8c of the lever 8b with one of the rear steps 22 of the locking link 20 in engagement would come. In the illustration of Figure 3 are for reasons of better understanding the non-visible stages 22 drawn.

Claims (9)

  1. Device for cutting sheet material (2), comprising a table (12) for receiving the material, a knife for cutting the material and a pressure bar (11) which is adapted to be lowered onto the material that is to be cut, there being provided a drive unit (10) for lowering the pressure bar and a recuperating spring (6) for raising the pressure bar, characterised by an arrester device (7, 8, 9) which stops the pressure bar (11) in the event that the recuperating spring (6) breaks.
  2. Device according to claim 1, characterised in that the arrester device (7, 8, 9) indirectly locks the pressure bar (11) in the event that the recuperating spring (6) breaks.
  3. Device according to claim 2, characterised in that disposed in the drive train (3, 4, 5, 10) to the pressure bar (11) the arrester device (7, 8, 9) incorporates a locking element (8), into the path of which a stationary stop component (9) projects in the event that the spring breaks.
  4. Device according to claim 3, characterised in that the locking element (8) is pivotally mounted in the drive train (3, 4, 5, 10) between two stops (pin 17, slot 18), the recuperating spring (6) acting on a stationary component (1) of the cutting device and on the locking element (8), and the locking element (8) is acted upon by a release spring (7) of low spring resistance in the opposite direction to the direction of the force exerted by the recuperating spring (6).
  5. Device according to claim 3 or 4, characterised in that the pressure bar (11) is set in a machine column (1) and the drive train (3, 4, 5, 10) for the pressure bar (11) is essentially constituted by draw rods (3) which act on the pressure bar (11) at both ends thereof, bent angle levers (4) acting on the other end of the draw rods (3) and pivotally mounted in the machine column (1), a rod (5) which connects the bent angle levers (4), and a drive unit proper (10) which cooperates with one of the bent angle levers (4), the recuperating spring (6) acting on the machine column (1) and on the locking element (8) mounted in the connecting rod (5).
  6. Device according to claim 5, characterised in that the locking element (8) is in the form of a bent angle element which at its corner is pivotally mounted in the connecting rod (5), and the recuperating spring (6) acts on a lever (8a) of the bent angle element (8) in the region of the free lever end, and the free end (8c) of the other lever (8b) of the bent angle element (8) is adapted to be operatively connected to the stationary stop component (9).
  7. Device according to claim 6, characterised in that the stationary stop component (9) incorporates a detent gate (20) for engaging the locking element (8) in dependence on the position in which the pressure bar (11) has been arrested.
  8. Device according to any of claims 4 to 7, characterised in that the two stops of the locking element (8) are constituted by a peg (17) mounted in the connecting rod (5), which peg, at a distance from the pivot axis (16) of the locking element (8), passes through a slot (18) extending in the direction of pivot of the locking element (8) and disposed in said locking element (8).
  9. Device according to any of claims 1 to 8, characterised in that the drive unit proper (10) for pivoting the pressure bar (11) is in the form of a pressure cylinder.
EP95119684A 1995-01-26 1995-12-14 Device for cutting sheet material Expired - Lifetime EP0723842B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19502291A DE19502291C1 (en) 1995-01-26 1995-01-26 Device for cutting sheet materials
DE19502291 1995-01-26

Publications (2)

Publication Number Publication Date
EP0723842A1 EP0723842A1 (en) 1996-07-31
EP0723842B1 true EP0723842B1 (en) 1998-06-10

Family

ID=7752315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95119684A Expired - Lifetime EP0723842B1 (en) 1995-01-26 1995-12-14 Device for cutting sheet material

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US (1) US5740710A (en)
EP (1) EP0723842B1 (en)
JP (1) JPH08229892A (en)
DE (2) DE19502291C1 (en)
ES (1) ES2118496T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7237465B2 (en) * 2005-02-24 2007-07-03 Chien Kai Huang Operation mechanism for pressing board of electric paper cutters
US7976001B2 (en) * 2007-12-28 2011-07-12 Seiko Ltd. Sheet stack cutter and finisher having the same
EP3243617B1 (en) * 2016-05-13 2018-06-06 Adolf Mohr Maschinenfabrik GmbH & Co. KG Cutting machine
EP3243616B1 (en) * 2016-05-13 2018-06-06 Adolf Mohr Maschinenfabrik GmbH & Co. KG Cutting machine
US20180118397A1 (en) * 2016-10-28 2018-05-03 Illinois Tool Works Inc. Wrapping machine printer arrangement and wrapping machine film cutter arrangement

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US368672A (en) * 1887-08-23 Leather-cutting machine
US440195A (en) * 1890-11-11 Press for bundle-wrapping
US53169A (en) * 1866-03-13 Paper-cutting machine
US734819A (en) * 1902-08-11 1903-07-28 George D Clapp Sole-leather-cutting machine.
US773742A (en) * 1904-04-12 1904-11-01 Child Acme Cutter And Press Co Paper-cutting machine.
US915532A (en) * 1907-10-26 1909-03-16 Daniel L Appelberry Meat-slicer.
US1091655A (en) * 1910-04-12 1914-03-31 Julius H Hampp Material-clamping mechanism for slicing-machines.
US1018380A (en) * 1911-07-08 1912-02-20 Nicholas L Minster Horseshoer's foot-vise.
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US2397896A (en) * 1944-04-21 1946-04-02 Cleveland Crane Eng Shear press
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US4561479A (en) * 1984-04-04 1985-12-31 Burdine Charles M Mechanical wood splitter

Also Published As

Publication number Publication date
DE59502499D1 (en) 1998-07-16
US5740710A (en) 1998-04-21
EP0723842A1 (en) 1996-07-31
JPH08229892A (en) 1996-09-10
DE19502291C1 (en) 1996-02-15
ES2118496T3 (en) 1998-09-16

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