EP0620173B1 - Detector for periodically detecting pile height - Google Patents

Detector for periodically detecting pile height Download PDF

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Publication number
EP0620173B1
EP0620173B1 EP94104376A EP94104376A EP0620173B1 EP 0620173 B1 EP0620173 B1 EP 0620173B1 EP 94104376 A EP94104376 A EP 94104376A EP 94104376 A EP94104376 A EP 94104376A EP 0620173 B1 EP0620173 B1 EP 0620173B1
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EP
European Patent Office
Prior art keywords
stack
sensing
machine
lever
levers
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
EP94104376A
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German (de)
French (fr)
Other versions
EP0620173A1 (en
Inventor
Hans-Peter Hiltwein
Jochen Renner
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.)
Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Publication of EP0620173A1 publication Critical patent/EP0620173A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/18—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device controlled by height of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/48—Air blast acting on edges of, or under, articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/50—Machine elements
    • B65H2402/54—Springs, e.g. helical or leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B65H2403/512—Cam mechanisms involving radial plate cam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/60—Details of intermediate means between the sensing means and the element to be sensed
    • B65H2553/61—Mechanical means, e.g. contact arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a button for cyclically scanning the stack height of a stack of a paper sheet processing machine, in particular a printing machine.
  • a button is known which is lowered via a four-bar guide gear, which is rigidly connected to a four-bar drive gear, which in turn is controlled by a cam drive, for cyclic scanning of the sheet stack on the stack surface and to release the upper sheet of paper Scanning the stack height for taking over the paper sheet by subordinate suction cups is raised again.
  • a double four-bar drive all inertial forces of both four-bar systems act when the feeler foot is lowered.
  • this sheet of paper becomes part of the drive area because of the high inertial forces of both four-bar drives, but also because of the drive area that extends a little further downwards for the measurement to be sure that the foot touches the top sheet of paper high, further driving forces pressed onto the upper sheet of paper.
  • the upper sheets of paper can be deformed in a wave shape, which jeopardizes safe sheet takeover and conveying of the paper sheets after being picked up by the suction cups, especially at high speeds.
  • the lifted paper sheets are usually taken over by the suction cups from the suction cups and conveyed over the front edge stops of the stack.
  • a wavy design of the paper sheets can on the one hand lead to tripping phenomena of the paper sheet when conveyed, for example, via the leading edge stops, and on the other hand the non-uniform corrugation also facilitates a non-uniform underflow of the sheet, in particular when using air blowers, which means that Flutter phenomena are made possible.
  • a safe height measurement and height readjustment with the undefined indentation of the push button into the stack is hardly possible with such a push button device. With such a push button device, deviations in the measured stack height depend on the inertial forces and the conveying speed.
  • the type of paper also plays a role. An inaccurate height measurement leads to an inaccurate height setting and thus to problems in the safe sheet removal and sheet conveyance. It is also possible that the paper sheets will be damaged completely.
  • a button is known in which a feeler foot is driven by a cam-controlled pivot lever and a four-bar guide gear.
  • a guide rod is attached to the four-bar guide gear, around which a compression spring is wound.
  • the guide rod is movably mounted in the swivel lever.
  • the compression spring is pressed off on the swivel lever. After placing the sensing foot on the stack surface, the high inertial forces of the solid swivel lever no longer fully affect the stack surface.
  • the swivel lever which moves a little further downwards after the touchdown moment, compresses the spring over the entire drive region of the swivel lever that drives further downward, as a result of which the force acting on the stack from the spring via the feeler foot after the touch foot is placed on the stack surface however, continues to increase over the downward drive cycle. Due to the rapidly increasing spring force, the feeler foot is pressed onto the stack surface undesirably strongly, which means that the upper paper sheets can also be pressed in indefinitely. A safe separation and conveyance of the paper sheets, a safe determination of the stack height and a safe stack readjustment is not guaranteed even with such a push button device. Damage to the paper sheets is also possible here.
  • the US 4,786,043 shows a four-bar guide gear, in which the feeler foot is placed on the stack surface from above and is pivoted out of the stack area again after the stack height has been determined, so that the suction cups can grip the paper sheet more quickly, but safe stack processing at very high speeds cannot be achieved for the reasons mentioned.
  • DE-OS 32 18 565 shows a suction lock with a vertically up and down guide member which engages in an elongated hole of a tongue with a pressure plate.
  • the tongue is attached to a frame via a spring.
  • the pressure plate is lifted vertically by lifting the guide member. When lowering, it is lowered vertically due to the spring force until the pressure plate touches the stack surface and presses it under spring force. With further lowering of the guide member, no increasing force is exerted by the pressure plate on the sheet stack, but the purely vertical movement of the drive plate makes fast, safe processing of the stack by suction almost impossible.
  • the pressure plate To securely take over a sheet, the pressure plate must first be in a position above the height to which the suction cups lift the sheet.
  • the pressure plate can be lowered again for height measurement.
  • This sequential sequence of the individual processes takes up an undesirable amount of time. This is detrimental to a high speed requirement.
  • the pressure plate which is always located above the upper arch due to the vertical movement, cannot hold the arch located under the raised arch after the arch has been lifted, so that when the upper arch is transported away when the upper arch sags due to frictional effects or flow effects, part of it Position can be torn out with. Both the height sensing as well as the sheet pick-up and sheet feeding are at risk. Even with such a button, safe batch processing at high speeds is not possible.
  • the invention is therefore based on the object of designing a pushbutton for cyclically scanning the stack height of a lay-up stack of a paper sheet processing machine, in particular a printing press, in such a way that reliable denesting is possible even at high speeds.
  • the object is achieved by the design of a push button according to the features of claim 1.
  • the lever drive gear enables the pushbutton to be driven safely.
  • the four-bar guide gear with the levers arranged one above the other and the feeler foot attached to the coupling enables the feeler foot to be pivoted in and out on a curved path, so that the feeler foot can be placed essentially vertically on the stack surface and is safe for faster sheet removal from the stacking area can be swung out.
  • the subsequent sheet can be picked up more quickly by subordinate conveying means, for example by suction lifters be reduced, whereby the duration of a funding cycle can be reduced.
  • the vertical placement of the feeler foot enables a safe placement of the feeler foot for the paper sheets underneath, which is particularly advantageous at high speeds.
  • the coupling between the drive gear and the four-bar guide gear by means of a driving stop and a stop surface for lifting the feeler foot enables safe and quick lifting of the feeler foot in accordance with the drive control. At the moment the touch foot is put on, only the masses of the touch foot and guide gear and the spring force act.
  • the decoupling of the drive gear and the guide gear enables a simple, light design of the guide gear, so that the force exerted by the guide gear and the feeler foot can be minimized when the feeler foot is put on.
  • the spring which is fixed to the machine, presses the probe foot onto the stack surface when it is placed down with a defined spring force.
  • This spring force can be selected by dimensioning the spring so that it is just so strong at the moment of placement that a safe arc height measurement is still possible.
  • the embodiment according to the features of claim 2 is particularly advantageous.
  • the stop surface can be designed to be particularly small and simple, since the entrainment stop assumes the same position with respect to the stop surface in every position of the contact with the stop surface. Inaccuracies due to manufacturing and movement tolerances between the stop surface and the driving stop, which have a negative effect on the pushbutton movement, can thus be reduced.
  • a particularly simple and safe drive is made possible by the configuration according to the features of claim 4.
  • the number of articulation points can be minimized while maintaining the advantages of the four-articulated drives for guidance, drive and mass distribution.
  • the feeler foot is attached to the extension of the coupling so that it can be adjusted in height. This enables simple, exact adjustment and readjustment of the feeler foot. The safe final stacking can thus be ensured in a simple manner.
  • Fig. 1 shows a feeder of a sheet-fed offset printing machine, in which in a known manner the top sheet of a stack 1 is lifted by a suction device 5 of a suction head 2 and forward drag suction devices 6 of the suction head 2 from the suction head area forward to conveying means, not shown, in the area of the feed table to be led.
  • the paper sheet is transferred via the feed table 3 to gripper bars of the pre-gripper drum 4, which transfer it to a printing cylinder, not shown, in a known manner.
  • a feeler foot 8 is swung in under the raised sheet of paper into the area above the lay-up stack 1 and lowered onto the lay-up stack 1 until the feeler foot comes into contact with the upper sheet of the lay-up stack 1.
  • the feeler foot 8 is fastened in a vertical downward extension of a coupling 11.
  • the coupling 11 is articulated with an upper joint 12 to a lever 14 and with a lower joint 13 a lever 16 hinged.
  • the lever 14 is pivotally mounted with its other lever end in a machine-fixed pivot bearing 15.
  • the feeler foot 8 is lowered essentially parallel to the lever 14, the lever 16 is aligned and pivotably articulated in a machine-mounted pivot bearing 17.
  • Concentric to the pivot axis of the lever 16 about the pivot bearing 17, a lever 18 is pivotally articulated in the pivot bearing 17.
  • the lever 18 is articulated at its other lever end with a joint 19 to a coupling 20, which in turn is articulated in a joint 21 to a lever 22.
  • the lever 22 is pivotally mounted in a machine-mounted pivot bearing 23.
  • a scanning roller 24 is rotatably mounted on the lever 22 between the joint 21 and the pivot bearing 23.
  • a tension spring 27 engages on the lever 22 and is mounted on the machine with its other spring bearing. The spring 27 holds the scanning roller 24 in permanent contact with the outer contour of the radial curve 25.
  • the radial curve 25 is fastened on a control shaft 26 which extends transversely to the sheet conveying direction and which is rotatably mounted in the suction head frame in a known manner, not shown.
  • the control shaft 26 is connected in a known manner to the machine drive.
  • a stop screw 30 is screwed into the lever arm 29 of the lever 18 below the lever 16.
  • the stop screw 30 is designed with its upper surface facing the lever 16 as a stop surface. Opposite the lever 16 is formed with a corresponding stop surface 31.
  • a spiral bending spring 28 is wound around the pivot bearing 15, which is supported with its one spring bearing on a machine-fixed stop 40 and with its other spring bearing on the lever 14. The spiral spring 28 presses the lever arm 14 downwards.
  • the lever 14, the coupling 11 and the lever 16 are moved downward by pivoting the lever 14 about the pivot bearing 15 and the lever 16 about the pivot bearing 17, the stop surface 31 of the lever 16 being in constant contact with one another to the stop screw 30.
  • the front edge 42 of the feeler foot 8 describes a curve 41, ie it is first pivoted almost horizontally from an area outside the stacking stack into the region of the stacking stack under the paper sheets (not shown) that have already been removed, in order to then pass into a substantially vertical movement range. by lowering the foot on the stack surface. This downward movement continues until the sensing foot, as shown in FIG. 3b, rests on the surface of the stack 1.
  • the sensor 34 is connected via an electrical connection 35 to a measuring and evaluation device, for example a computer. From the distance between sensor 34 and measuring surface 33, the computer determines the current height of the stack in a known manner.
  • the sheet of paper, not shown, previously raised by the lifting suction device 5, is transferred from the suction devices 6 to conveying means, not shown, of the feed table.
  • the spring 28 is dimensioned so that the feeler just rests on the stack with such a force that a height measurement is still possible.
  • the feeler foot prevents the currently uppermost sheet 10 of the stack 1, on which the feeler foot rests, from being carried away by the paper sheet which has already been lifted off and is carried away by the suction devices.
  • a blowing nozzle 36 is attached to the sensing foot 8 and is connected to blowing air in a cyclically controlled manner via a blowing air supply line 9. This will blow off the sheet that is lifted. This makes it easier to prevent contact with the stack.
  • the contact screw 30 is no longer lowered.
  • the distance between the contour of the curve 25 and the control shaft 26 increases again, so that the scanning roller 24 and thus the lever 22 are pivoted away from the control shaft 26 again.
  • the lever 18 is pivoted about the pivot shaft 17 so that the stop screw 30 moves upward.
  • the stop screw 30 takes over its stop surface and over the stop surface 31 of the lever 16, the lever 16 with pivoting about the pivot axis 17 upwards.
  • the feeler foot 8 lifts essentially vertically from the stack surface and is pivoted back out of the area above the stack into a position in an area outside the stack. Such a position is shown for example in Fig. 3a.
  • the suction cups 5 are cyclically lowered again in a known manner to receive the next sheet of paper from the stack. Lifting suction device 5 and drag suction device 6 are supplied with suction air in a known manner via the suction head with the aid of a suction air supply line 7.
  • a spiral spring can also be wound around the pivot axis 15.
  • One spring arm is supported against a pin 38 fastened in the suction head housing, the other spring arm is supported against a pin 39 fastened in the lever arm 14.
  • the height of the feeler foot can be adjusted exactly.
  • the stack height determined by the computer is used in a known manner for cyclical adjustment of the stack height.
  • the computer can cyclically generate a control signal corresponding to the measured value for the drive means of the Lift drive take place.
  • the separation of the drive gear from the guide gear enables a simple, lightweight construction of the guide gear and the feeler foot.
  • the parts can be made largely of plastic and / or aluminum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Push-Button Switches (AREA)
  • Switches With Compound Operations (AREA)

Abstract

A detector for periodically detecting the pile height of a feed pile (1) of a paper sheet processing machine, in particular a printing machine, having a lever drive mechanism with a scanning roll which is in constant contact, by means of a spring, with a drive cam which can be driven cyclically at least during the paper run, having a four-bar guide mechanism with two levers (14, 16, 18, 22) which are arranged one above the other, are mounted in each case with one lever end in an articulated manner on the frame, and are mounted in each case with their other lever end in an articulated manner on a coupler (20), spaced apart, a detector foot (8) being attached to a downwardly extending, vertical continuation of the coupler (20) to detect the pile height, having a carrier stop which is attached to the drive mechanism, having a stop surface (31) on the guide mechanism, which stop surface is arranged and designed to correspond to the carrier stop for the periodical production of a contact to raise the detector foot (8), and having a spring whose one spring bearing is attached fixedly to the machine and whose other spring bearing is attached to the guide mechanism and whose spring force presses the stop surface (31) in the direction towards the carrier stop. <IMAGE>

Description

Die Erfindung betrifft einen Taster zum zyklischen Abtasten der Stapelhöhe eines Anlegestapels einer papierbogenverarbeitenden Maschine, insbesondere einer Druckmaschine. Aus der DE-OS 40 09 175 ist ein Taster bekannt, der über ein Viergelenkführungsgetriebe, das starr mit einem Viergelenkantriebsgetriebe verbunden ist, welches seinerseits über einen Kurvenantrieb gesteuert wird, zum zyklischen Abtasten der Bogenstapel auf die Stapeloberfläche abgesenkt und zur Freigabe des oberen Papierbogens nach Abtasten der Stapelhöhe für die Übernahme des Papierbogens durch nachgeordnete Sauger wieder angehoben wird . Bei einem solchen doppelten Viergelenkantrieb wirken bei Absenken des Tastfußes dabei sämtliche Massenkräfte beider Viergelenke. Nach Aufsetzen des Tastfußes auf den oberen Papierbogen des Stapels wird dieser Papierbogen zum einen wegen der hohen Massenkräfte beider Viergelenkantriebe, zum anderen aber auch aufgrund des für eine sichere Messung erforderlichen über den Berührpunkt des Tastfußes mit dem oberen Papierbogen noch etwas weiter nach unten reichenden Antriebsbereichs mit hohen, weiter antreibenden Kräften auf den oberen Papierbogen gedrückt. Hierdurch können die oberen Papierbogen wellenförmig verformt werden, wodurch eine sichere Bogenübernahme und Förderung der Papierbogen nach Aufnahme durch die Hubsauger, insbesondere bei hohen Geschwindigkeiten, gefährdet ist. Die angehobenen Papierbogen werden üblicherweise von Schleppsaugern von den Hubsaugern übernommen und über Vorderkantenanschläge des Stapels gefördert. Eine wellenförmige Ausbildung der Papierbogen kann zum einen zu Stolpererscheinungen des Papierbogens bei Förderung beispielsweise über die Vorderkantenanschläge führen, zum anderen erleichtert die ungleichförmige Wellung aber auch ein ungleichförmiges Unterströmen des Bogens insbesondere bei Verwendung von Tragluftbläsern, wodurch Flattererscheinungen ermöglicht werden. Außerdem ist eine sichere Höhenmessung und Höhennachregulierung bei der undefinierten Eindrücktiefe des Tasters in den Stapel bei einer solchen Tastereinrichtung kaum möglich. Abweichungen in der gemessenen Stapelhöhe hängen bei einer solchen Tastereinrichtung von den Massenkräften und von der Fördergeschwindigkeit ab. Außerdem spielt die Papiersorte eine Rolle. Eine ungenaue Höhenmessung führt zu einer ungenauen Höheneinstellung und somit zu Problemen in der sicheren Bogenabnahme und Bogenförderung. Außerdem ist es möglich, daß die Papierbogen ganz beschädigt werden.The invention relates to a button for cyclically scanning the stack height of a stack of a paper sheet processing machine, in particular a printing machine. From DE-OS 40 09 175 a button is known which is lowered via a four-bar guide gear, which is rigidly connected to a four-bar drive gear, which in turn is controlled by a cam drive, for cyclic scanning of the sheet stack on the stack surface and to release the upper sheet of paper Scanning the stack height for taking over the paper sheet by subordinate suction cups is raised again. With such a double four-bar drive, all inertial forces of both four-bar systems act when the feeler foot is lowered. After placing the feeler foot on the top sheet of paper in the stack, this sheet of paper becomes part of the drive area because of the high inertial forces of both four-bar drives, but also because of the drive area that extends a little further downwards for the measurement to be sure that the foot touches the top sheet of paper high, further driving forces pressed onto the upper sheet of paper. As a result, the upper sheets of paper can be deformed in a wave shape, which jeopardizes safe sheet takeover and conveying of the paper sheets after being picked up by the suction cups, especially at high speeds. The lifted paper sheets are usually taken over by the suction cups from the suction cups and conveyed over the front edge stops of the stack. A wavy design of the paper sheets can on the one hand lead to tripping phenomena of the paper sheet when conveyed, for example, via the leading edge stops, and on the other hand the non-uniform corrugation also facilitates a non-uniform underflow of the sheet, in particular when using air blowers, which means that Flutter phenomena are made possible. In addition, a safe height measurement and height readjustment with the undefined indentation of the push button into the stack is hardly possible with such a push button device. With such a push button device, deviations in the measured stack height depend on the inertial forces and the conveying speed. The type of paper also plays a role. An inaccurate height measurement leads to an inaccurate height setting and thus to problems in the safe sheet removal and sheet conveyance. It is also possible that the paper sheets will be damaged completely.

Insbesondere bei hohen Geschwindigkeiten, bei denen ein solcher Antrieb zur sicheren Antriebsgestaltung ein Antriebsgetriebe mit massiver Ausbildung erfordert, erhöhen sich diese Gefahren. Bei einer solchen Tastereinrichtung ist es demnach nur schwer möglich, eine sichere Bogenvereinzelung und Bogenförderung bei hohen Geschwindigkeiten trotz des für die Führung besonders vorteilhaften Viergelenkantriebs, zu gewährleisten.These dangers increase particularly at high speeds, at which such a drive requires a drive gear with a solid design for safe drive design. With such a pushbutton device, it is therefore difficult to ensure a safe sheet separation and sheet conveyance at high speeds despite the four-bar drive which is particularly advantageous for the guide.

Aus der US 4,786,043 ist ein Taster bekannt, bei dem ein Tastfuß von einem kurvengesteuerten Schwenkhebel und einem Viergelenkführungsgetriebe angetrieben wird. Am Viergelenkführungsgetriebe ist eine Führungsstange befestigt, um die eine Druckfeder gewickelt ist. Die Führungsstange ist im Schwenkhebel beweglich gelagert. Die Druckfeder drückt sich am Schwenkhebel ab. Nach Aufsetzen des Tastfußes auf die Stapeloberfläche wirken zwar die hohen Massenkräfte des massiv ausgebildeten Schwenkhebels nicht mehr voll auf die Stapeloberfläche. Der nach dem Aufsetzmoment sich noch etwas weiter nach unten bewegende Schwenkhebel drückt jedoch die Feder über den gesamten weiter abwärts treibenden Antriebsbereich des Schwenkhebels hinweg zusammen, wodurch die von der Feder über den Tastfuß auf den Stapel wirkende Kraft nach Aufsetzen des Tastfußes auf die Stapeloberfläche jedoch kontinuierlich über den abwärtstreibenden Antriebszyklus weiter ansteigt. Der Tastfuß wird aufgrund der stark zunehmenden Federkraft unerwünscht stark auf die Stapeloberfläche aufgedrückt, wodurch auch die oberen Papierbogen undefiniert eingedrückt werden können. Eine sichere Vereinzelung und Wegförderung der Papierbogen, eine sichere Ermittlung der Stapelhöhe und eine sichere Stapelnachstellung ist auch bei einer solchen Tastereinrichtung nicht gewährleistet. Beschädigungen der Papierbogen sind auch hier möglich. Insbesondere bei hohen Geschwindigkeiten wirken sich die starken Eindrücke und die Ungenauigkeit der Wellung für eine exakte Förderung nachteilig aus. Die US 4,786,043 zeigt zwar ein Viergelenkführungsgetriebe, bei dem der Tastfuß zum Aufsetzen auf die Stapeloberfläche von oben abgesetzt wird und nach der Stapelhöhenermittlung wieder aus dem Stapelbereich herausgeschwenkt wird, so daß die Hubsauger den Papierbogen schneller ergreifen können, aber eine sichere Stapelabarbeitung bei sehr hohen Geschwindigkeiten ist aus genannten Gründen damit nicht erzielbar.From US 4,786,043 a button is known in which a feeler foot is driven by a cam-controlled pivot lever and a four-bar guide gear. A guide rod is attached to the four-bar guide gear, around which a compression spring is wound. The guide rod is movably mounted in the swivel lever. The compression spring is pressed off on the swivel lever. After placing the sensing foot on the stack surface, the high inertial forces of the solid swivel lever no longer fully affect the stack surface. However, the swivel lever, which moves a little further downwards after the touchdown moment, compresses the spring over the entire drive region of the swivel lever that drives further downward, as a result of which the force acting on the stack from the spring via the feeler foot after the touch foot is placed on the stack surface however, continues to increase over the downward drive cycle. Due to the rapidly increasing spring force, the feeler foot is pressed onto the stack surface undesirably strongly, which means that the upper paper sheets can also be pressed in indefinitely. A safe separation and conveyance of the paper sheets, a safe determination of the stack height and a safe stack readjustment is not guaranteed even with such a push button device. Damage to the paper sheets is also possible here. Particularly at high speeds, the strong impressions and the inaccuracy of the corrugation have a negative effect on exact conveyance. The US 4,786,043 shows a four-bar guide gear, in which the feeler foot is placed on the stack surface from above and is pivoted out of the stack area again after the stack height has been determined, so that the suction cups can grip the paper sheet more quickly, but safe stack processing at very high speeds cannot be achieved for the reasons mentioned.

Der DE-OS 32 18 565 ist ein Saugschloß zu entnehmen mit vertikal auf- und abbewegtem Führungsglied, das in ein Langloch einer Zunge mit Anpreßlasche eingreift. Die Zunge ist dabei über eine Feder an einem Rahmen befestigt. Durch Anheben des Führungsgliedes wird die Anpreßlasche vertikal angehoben. Bei Absenken wird sie aufgrund der Federkraft vertikal abgesenkt, bis die Anpreßlasche die Stapeloberfläche berührt und unter Federkarft auf diesen drückt. Bei weiterem Absenken des Führungsglieds wird zwar keine zunehmende Kraft von der Anpreßlasche auf den Bogenstapel ausgeübt, aber die rein vertikale Bewegung der Antriebslasche macht eine schnelle, sichere Abarbeitung des Stapels durch Sauger dennoch nahezu unmöglich. Zur sicheren Übernahme eines Bogens muß die Anpreßlasche zunächst in eine Position oberhalb der Höhe, in die die Hubsauger die Bogen heben. Erst nachdem der Bogen, z.B. durch Schleppsauger, aus dem Hubbereich der Anpreßlasche wegtransportiert ist, kann die Anpreßlasche zur Höhenmessung wieder abgesenkt werden. Dieser zeitlich rein hintereinandergereihte Ablauf der einzelnen Vorgänge verschlingt unerwünscht viel Zeit. Dies ist einer Forderung mit hohen Geschwindigkeiten abträglich. Außerdem kann die aufgrund der Vertikalbewegung immer oberhalb des oberen Bogens befindliche Anpreßlasche nach Anheben des Bogens nicht den unter dem angehobenen Bogen befindlichen Bogen festhalten, so daß dieser beim Wegtransport des oberen Bogens bei Durchhängen des oberen Bogens aufgrund von Reibungseffekten oder aufgrund von Strömungseffekten teilweise aus seiner Position mit herausgerissen werden kann. Sowohl die Höhenabtastung als auch die Bogenaufnahme und Bogenförderung sind hierdurch gefährdet. Auch mit einem solchen Taster ist eine sichere Stapelabarbeitung bei hohen Geschwindigkeiten nicht möglich.DE-OS 32 18 565 shows a suction lock with a vertically up and down guide member which engages in an elongated hole of a tongue with a pressure plate. The tongue is attached to a frame via a spring. The pressure plate is lifted vertically by lifting the guide member. When lowering, it is lowered vertically due to the spring force until the pressure plate touches the stack surface and presses it under spring force. With further lowering of the guide member, no increasing force is exerted by the pressure plate on the sheet stack, but the purely vertical movement of the drive plate makes fast, safe processing of the stack by suction almost impossible. To securely take over a sheet, the pressure plate must first be in a position above the height to which the suction cups lift the sheet. Only after the If the sheet is transported away from the stroke area of the pressure plate, for example by a suction cup, the pressure plate can be lowered again for height measurement. This sequential sequence of the individual processes takes up an undesirable amount of time. This is detrimental to a high speed requirement. In addition, the pressure plate, which is always located above the upper arch due to the vertical movement, cannot hold the arch located under the raised arch after the arch has been lifted, so that when the upper arch is transported away when the upper arch sags due to frictional effects or flow effects, part of it Position can be torn out with. Both the height sensing as well as the sheet pick-up and sheet feeding are at risk. Even with such a button, safe batch processing at high speeds is not possible.

Der Erfindung liegt demnach die Aufgabe zugrunde, einen Taster zum zyklischen Abtasten der Stapelhöhe eines Anlegestapels einer papierbogenverarbeitenden Maschine, insbesondere einer Druckmaschine so zugestalten, daß auch bei hohen Geschwindigkeiten ein sicheres Entstapeln möglich ist.The invention is therefore based on the object of designing a pushbutton for cyclically scanning the stack height of a lay-up stack of a paper sheet processing machine, in particular a printing press, in such a way that reliable denesting is possible even at high speeds.

Erfindungsgemäß wird die Aufgabe durch die Ausgestaltung eines Tasters gemäß den Merkmalen von Anspruch 1 gelöst. Das Hebelantriebsgetriebe ermöglicht einen sicheren Antrieb des Tasters. Das Viergelenkführungsgetriebe mit den übereinander angeordneten Hebeln und dem an der Koppel befestigten Tastfuß ermöglicht ein Ein- und Ausschwenken des Tastfußes auf einem kurvenförmigen Pfad, so daß der Tastfuß im wesentlichen senkrecht auf die Stapeloberfläche aufgesetzt werden kann und für die schnellere Bogenabnahme wieder aus dem Stapelbereich sicher ausgeschwenkt werden kann. Hierdurch kann der nachfolgende Bogen schneller von nachgeordneten Fördermitteln, beispielsweise von Hubsaugern, aufgenommen werden, wodurch die Dauer eines Förderzyklus reduzierbar ist. Das senkrechte Aufsetzen des Tastfußes ermöglicht dabei ein für die darunter befindlichen Papierbogen verschiebungsfreles sicheres Aufsetzen des Tastfußes, was insbesondere bei hohen Geschwindigkeiten von Vorteil ist. Die Kopplung zwischen Antriebsgetriebe und Viergelenkführungsgetriebe durch Mitnahmeanschlag und Anschlagsfläche zum Anheben des Tastfußes ermöglicht ein sicheres, schnelles Anheben des Tastfußes entsprechend der Antriebssteuerung. Im Moment des Aufsetzens des Tastfußes wirken lediglich die Massen von Tastfuß und Führungsgetriebe und der Federkraft. Die Entkopplung von Antriebsgetriebe und Führungsgetriebe ermöglicht eine einfache, leichte Ausführung des Führungsgetriebes, so daß die vom Führungsgetriebe und vom Tastfuß ausgeübte Kraft bei Aufsetzen des Tastfußes minimiert werden kann. Die maschinenfest gelagerte Feder drückt bei Aufsetzen mit einer definierten Federkraft den Tastfuß auf die Stapeloberfläche. Diese Federkraft kann durch Dimensionierung der Feder so gewählt werden, daß sie im Moment des Aufsetzens gerade so stark ist, daß eine sichere Bogenhöhenmessung noch möglich ist. Obwohl die Massenkräfte und die Antriebskräfte des Antriebsgetriebes dieses nach dem Moment des Aufsetzen des Tastfußes noch über den Moment des Aufsetzens gleichgerichtet weiterbewegen, verharrt der Tastfuß lediglich mit der im Moment des Aufsetzens des Tastfußes von der Feder auf den Tastfuß ausgeübten Kraft auf der Stapeloberfläche. Da somit nach dem Moment des Aufsetzens der Tastfuß mit einer konstanten, minimierten Kraft lediglich auf den oberen Stapelbogen aufliegt, ist ein unerwünscht starkes Eindrücken der oberen Stapelbögen vermeidbar. Hierdurch wird die Bogenförderung, die Höhenmessung und die Höhennachregulierung geschwindigkeitsunabhängig sicherer. Somit ist es mit einem solchen Taster möglich, auch bei hohen Geschwindigkeiten eine sichere Entstapelung eines Anlegestapels zu gewährleisten. Der Tastfuß kann außerdem nach Anheben eines Bogenstapels noch unter den angehobenen Bogen bereits eingeschwenkt werden und auf den unter dem angehobenen Bogen befindlichen Stapel aufgesetzt werden. Bei Entfernen des angehobenen Bogens ist der auf dem Stapel befindliche obere Papierbogen durch den Tastfuß in seiner Position sichergestellt, und kann durch den weggeförderten Bogen nicht in seiner Position verändert werden.According to the invention, the object is achieved by the design of a push button according to the features of claim 1. The lever drive gear enables the pushbutton to be driven safely. The four-bar guide gear with the levers arranged one above the other and the feeler foot attached to the coupling enables the feeler foot to be pivoted in and out on a curved path, so that the feeler foot can be placed essentially vertically on the stack surface and is safe for faster sheet removal from the stacking area can be swung out. As a result, the subsequent sheet can be picked up more quickly by subordinate conveying means, for example by suction lifters be reduced, whereby the duration of a funding cycle can be reduced. The vertical placement of the feeler foot enables a safe placement of the feeler foot for the paper sheets underneath, which is particularly advantageous at high speeds. The coupling between the drive gear and the four-bar guide gear by means of a driving stop and a stop surface for lifting the feeler foot enables safe and quick lifting of the feeler foot in accordance with the drive control. At the moment the touch foot is put on, only the masses of the touch foot and guide gear and the spring force act. The decoupling of the drive gear and the guide gear enables a simple, light design of the guide gear, so that the force exerted by the guide gear and the feeler foot can be minimized when the feeler foot is put on. The spring, which is fixed to the machine, presses the probe foot onto the stack surface when it is placed down with a defined spring force. This spring force can be selected by dimensioning the spring so that it is just so strong at the moment of placement that a safe arc height measurement is still possible. Although the inertial forces and the driving forces of the drive gear continue to move it in the same direction after the moment the foot is placed on the surface, the foot only remains on the stack surface with the force exerted by the spring on the foot from the spring to the foot. Since, after the moment of touching down, the feeler foot rests only on the upper stacking sheet with a constant, minimized force, an undesirably strong indentation of the upper stacking sheets can be avoided. As a result, sheet conveyance, height measurement and height adjustment are safer, regardless of speed. It is thus possible with such a button to ensure that a stack of stacks is safely destacked even at high speeds. After lifting a sheet stack, the feeler foot can still be under the raised one Sheets are already swung in and placed on the stack located under the raised sheet. When the raised sheet is removed, the upper paper sheet on the stack is secured in its position by the feeler foot and cannot be changed in position by the sheet being transported away.

Besonders vorteilhaft ist die Ausgestaltung gemäß den Merkmalen von Anspruch 2. Die Anschlagsfläche kann bei einer solchen Ausgestaltung besonders klein und einfach ausgeführt werden, da der Mitnahmeanschlag in jeder Position des Berührkontakts zur Anschlagsfläche bezüglich der Anschlagsfläche die gleiche Position einnimmt. Ungenauigkeiten, aufgrund von Fertigungs- und Bewegungstoleranzen zwischen Anschlagsfläche und Mitnahmeanschlag die sich auf die Tasterbewegung negativ auswirken, sind dadurch reduzierbar.The embodiment according to the features of claim 2 is particularly advantageous. With such an embodiment, the stop surface can be designed to be particularly small and simple, since the entrainment stop assumes the same position with respect to the stop surface in every position of the contact with the stop surface. Inaccuracies due to manufacturing and movement tolerances between the stop surface and the driving stop, which have a negative effect on the pushbutton movement, can thus be reduced.

Ein besonders einfacher und sicherer Antrieb wird durch die Ausgestaltung gemäß den Merkmalen von Anspruch 4 ermöglicht. Die Zahl der Gelenkstellen kann bei Beibehaltung der Vorteile der Viergelenkantriebe für Führung, Antrieb und Massenverteilung minimiert werden.A particularly simple and safe drive is made possible by the configuration according to the features of claim 4. The number of articulation points can be minimized while maintaining the advantages of the four-articulated drives for guidance, drive and mass distribution.

Besonders vorteilhaft ist es, wenn zur Ermittlung der Stapelhöhe eine Abtastfläche am Führungsgetriebe gemäß den Merkmalen von Anspruch 6 eingesetzt wird. In einer bevorzugten Ausführung ist der Tastfuß höhenverstellbar an der Verlängerung der Koppel befestigt. Hierdurch ist eine einfache exakte Einstellung und Nachstellung des Tastfußes möglich. Somit kann in einfacher Weise die sichere Endstapelung gewährleistet werden.It is particularly advantageous if a scanning surface on the guide gear is used to determine the stack height in accordance with the features of claim 6. In a preferred embodiment, the feeler foot is attached to the extension of the coupling so that it can be adjusted in height. This enables simple, exact adjustment and readjustment of the feeler foot. The safe final stacking can thus be ensured in a simple manner.

Die Ansprüche 3, 5 und 7 stellen bevorzugte Ausgestaltungsformen dar.Claims 3, 5 and 7 represent preferred embodiments.

Die Erfindung ist im folgenden anhand der in den Fig. 1 bis 3 dargestellten Ausführungsformen, näher erläutert.The invention is explained in more detail below with reference to the embodiments shown in FIGS. 1 to 3.

Hierin zeigen:

Fig. 1
eine schematische Übersichtsskizze eines Anlegers einer Bogendruckmaschine mit Saugkopf und Tastfuß,
Fig. 2
eine schematische Darstellung eines erfindungsgemäßen Tastfußes,
Fig. 3
Funktionsschema des Tastfußantriebs.
Show here:
Fig. 1
1 shows a schematic overview sketch of a feeder of a sheet-fed printing machine with suction head and feeler foot,
Fig. 2
2 shows a schematic representation of a feeler foot according to the invention,
Fig. 3
Functional diagram of the feeler foot drive.

Fig. 1 zeigt einen Anleger einer Bogenoffsetrotationsdruckmaschine, bei dem in bekannter Weise jeweils der oberste Bogen eines Anlegestapels 1 von einem Hubsauger 5 eines Saugkopfes 2 angehoben und von nachgeordneten Schleppsaugern 6 des Saugkopfs 2 aus dem Saugkopfbereich nach vorn zu nicht dargestellten Fördermitteln im Bereich des Anlegetischs geführt wird. Nach Übernahme des Papierbogens durch die nicht dargestellten Fördermittel wird der Papierbogen über den Anlegetisch 3 an Greiferleisten der Vorgreifertrommel 4 übergeben, die ihn in bekannter weise an einen nicht dargestellten Druckzylinder übergeben. Sobald der oberste Papierbogen vom Hubsauger 2 vom Stapel angehoben ist, wird ein Tastfuß 8 unter den angehobenen Papierbogen in den Bereich oberhalb des Anlegestapels 1 eingeschwenkt und auf den Anlegestapel 1 soweit abgesenkt bis der Tastfuß in Berührkontakt mit dem oberen Bogen des Anlegestapels 1 gerät.Fig. 1 shows a feeder of a sheet-fed offset printing machine, in which in a known manner the top sheet of a stack 1 is lifted by a suction device 5 of a suction head 2 and forward drag suction devices 6 of the suction head 2 from the suction head area forward to conveying means, not shown, in the area of the feed table to be led. After the paper sheet has been taken over by the conveying means (not shown), the paper sheet is transferred via the feed table 3 to gripper bars of the pre-gripper drum 4, which transfer it to a printing cylinder, not shown, in a known manner. As soon as the top sheet of paper is lifted from the stack by the suction device 2, a feeler foot 8 is swung in under the raised sheet of paper into the area above the lay-up stack 1 and lowered onto the lay-up stack 1 until the feeler foot comes into contact with the upper sheet of the lay-up stack 1.

Wie in Fig. 2 dargestellt ist, ist der Tastfuß 8 in einer vertikalen nach unten weisenden Verlängerung einer Koppel 11 befestigt. Die Koppel 11 ist mit einem oberen Gelenk 12 an einen Hebel 14 angelenkt und mit einem unteren Gelenk 13 an einem Hebel 16 angelenkt. Der Hebel 14 ist mit seinem anderen Hebelende in einem maschinenfesten Schwenklager 15 schwenkbar gelagert. Bei abgesenktem Tastfuß 8 im wesentlichen parallel zum Hebel 14 ist der Hebel 16 ausgerichtet und in einem maschinenfesten Schwenklager 17 schwenkbar angelenkt. Konzentrisch zur Schwenkachse des Hebels 16 um das Schwenklager 17 ist ein Hebel 18 im Schwenklager 17 schwenkbar angelenkt. Der Hebel 18 ist an seinem anderen Hebelende mit einem Gelenk 19 an einer Koppel 20 angelenkt, die ihrerseits in einem Gelenk 21 an einem Hebel 22 angelenkt ist. Der Hebel 22 ist in einem maschinenfesten Schwenklager 23 schwenkbar gelagert. Zwischen Gelenk 21 und Schwenklager 23 ist am Hebel 22 eine Abtastrolle 24 drehbar gelagert. Am Hebel 22 greift eine Zugfeder 27 an, die mit ihrem anderen Federlager maschinenfest gelagert ist. Die Feder 27 hält die Abtastrolle 24 in dauerhaftem Berührkontakt zur Außenkontur der Radialkurve 25. Die Radialkurve 25 ist auf einer Steuerwelle 26 befestigt, die sich quer zur Bogenförderrichtung erstreckt und die im Saugkopfrahmen in bekannter, nicht dargestellter Weise drehbar gelagert ist. Die Steuerwelle 26 steht in bekannter Weise in Antriebsverbindung zum Maschinenantrieb.As shown in FIG. 2, the feeler foot 8 is fastened in a vertical downward extension of a coupling 11. The coupling 11 is articulated with an upper joint 12 to a lever 14 and with a lower joint 13 a lever 16 hinged. The lever 14 is pivotally mounted with its other lever end in a machine-fixed pivot bearing 15. When the feeler foot 8 is lowered essentially parallel to the lever 14, the lever 16 is aligned and pivotably articulated in a machine-mounted pivot bearing 17. Concentric to the pivot axis of the lever 16 about the pivot bearing 17, a lever 18 is pivotally articulated in the pivot bearing 17. The lever 18 is articulated at its other lever end with a joint 19 to a coupling 20, which in turn is articulated in a joint 21 to a lever 22. The lever 22 is pivotally mounted in a machine-mounted pivot bearing 23. A scanning roller 24 is rotatably mounted on the lever 22 between the joint 21 and the pivot bearing 23. A tension spring 27 engages on the lever 22 and is mounted on the machine with its other spring bearing. The spring 27 holds the scanning roller 24 in permanent contact with the outer contour of the radial curve 25. The radial curve 25 is fastened on a control shaft 26 which extends transversely to the sheet conveying direction and which is rotatably mounted in the suction head frame in a known manner, not shown. The control shaft 26 is connected in a known manner to the machine drive.

In einem Hebelarm 29 des Hebels 18 ist eine Anschlagsschraube 30 unterhalb des Hebels 16 eingeschraubt. Die Anschlagsschraube 30 ist mit ihrer oberen zum Hebel 16 weisenden Fläche als Anschlagsfläche ausgebildet. Ihr gegenüberliegend ist der Hebel 16 mit einer korrespondierenden Anschlagsfläche 31 ausgebildet. Am Hebel 14 ist um das Schwenklager 15 eine Spiralbiegefeder 28 gewickelt, die sich mit ihrem einen Federlager an einem maschinenfesten Anschlag 40 und mit ihrem anderen Federlager am Hebel 14 abstützt. Die Spiralfeder 28 drückt dabei den Hebelarm 14 nach unten.A stop screw 30 is screwed into the lever arm 29 of the lever 18 below the lever 16. The stop screw 30 is designed with its upper surface facing the lever 16 as a stop surface. Opposite the lever 16 is formed with a corresponding stop surface 31. On the lever 14, a spiral bending spring 28 is wound around the pivot bearing 15, which is supported with its one spring bearing on a machine-fixed stop 40 and with its other spring bearing on the lever 14. The spiral spring 28 presses the lever arm 14 downwards.

Nach Abnahme des obersten Papierbogens vom Anlegestapel 1 durch die Hubsauger 5 wird durch Verdrehen der Steuerwelle 26 und somit der Steuerkurve 25 aufgrund der Federkraft der Feder 27 die Abtastrolle 24 und somit der Hebel 22, aus der Position in Fig. 3a, um das Schwenklager 23 aufgrund des abnehmenden Abstands des Abtastpunkt der Kontur der Kurvenfläche der Kurve 25 vom Tasterfuß weggeschwenkt. Über die Koppel 20 wird hierdurch der Hebel 18 und somit die Anschlagsschraube 30 um das Schwenklager 17 verschwenkt, so daß die Anschlagsschraube 31 nach unten geschwenkt wird. Aufgrund der Federkraft der Feder 28 wird der Hebel 14, die Koppel 11 und der Hebel 16 unter Verschwenken des Hebels 14 um das Schwenklager 15 und des Hebels 16 um das Schwenklager 17 nach unten bewegt, wobei sich die Anschlagsfläche 31 des Hebels 16 in dauerndem Berührkontakt zur Anschlagsschraube 30 befindet. Bei dieser Abwärtsbewegung beschreibt die Vorderkante 42 des Tastfußes 8 eine Kurve 41, d. h. sie wird zunächst nahezu waagerecht von einem Bereich außerhalb des Anlegestapels in den Bereich des Anlegestapels unter den bereits abgenommenen nicht dargestellten Papierbogen eingeschwenkt, um dann in einen im wesentlichen vertikalen Bewegungsbereich überzugehen, in dem der Tastfuß auf die Stapeloberfläche abgesenkt wird. Diese Abwärtsbewegung geschieht so lange, bis der Tastfuß, wie in Fig. 3b dargestellt ist, auf der Oberfläche des Anlegestapels 1 aufliegt. Während nach Aufsetzen des Tastfußes 8 auf die Oberfläche des Anlegestapels 1 die Steuerwelle 26 weiter in gleicher Richtung verdreht wird, wodurch das Antriebsgetriebe besteht aus den Hebeln 22, 20 und 18 der Kurvenkontur der Kurve 25 weiterfolgend in der oben dargestellten Weise weiterbewegt werden, so daß die Anschlagsschraube 30 noch weiter abgesenkt wird, verbleibt der Tastfuß 8 lediglich aufgrund der Federkraft der Feder 28 auf der Oberfläche des Anlegestapels. Tastfuß 8, Koppel 11, Hebel 14 und 31 werden demnach nicht weiter bewegt. Die Anschlagsschraube 30 entfernt sich hierdurch nach unten von der Anschlagsfläche 31 des Hebels 16, wie in Fig. 3c dargestellt ist. Über eine Abtastfläche 33 eines Hebelarms 32 am Hebel 31 wird von einem berührungslosen Sensor 34 der Abstand zwischen Sensor und Meßfläche 33 ermittelt. Der Sensor 34 steht über eine elektrische Verbindung 35 mit einer Meß- und Auswerteeinrichtung, beispielsweise einem Computer in Verbindung. Aus dem Abstand zwischen Sensor 34 und Meßfläche 33 wird in bekannter Weise vom Computer die momentane Höhe des Anlegestapels ermittelt. Der zuvor vom Hubsauger 5 angehobene, nicht dargestellte Papierbogen, wird von Schleppsaugern 6 an nicht dargestellten Fördermitteln des Anlegetischs übergeben. Die Feder 28 ist so dimensioniert, daß der Tastfuß gerade mit einer solchen Kraft auf dem Anlegestapel aufliegt, daß eine Höhenmessung noch möglich ist. Der Tastfuß verhindert dabei, daß der momentan oberste Bogen 10 des Anlegestapels 1, auf dem der Tastfuß aufliegt von dem bereits abgehobenen und von den Schleppsaugern weggeführten Papierbogen mitgerissen wird.After removing the uppermost sheet of paper from the stack 1 by the suction cups 5, by rotating the control shaft 26 and thus the control cam 25 due to the spring force of the spring 27, the scanning roller 24 and thus the lever 22, from the position in FIG. 3a, about the pivot bearing 23 due to the decreasing distance of the sampling point of the contour of the curved surface of the curve 25 pivoted away from the feeler. As a result, the lever 18 and thus the stop screw 30 are pivoted about the pivot bearing 17 via the coupling 20, so that the stop screw 31 is pivoted downward. Due to the spring force of the spring 28, the lever 14, the coupling 11 and the lever 16 are moved downward by pivoting the lever 14 about the pivot bearing 15 and the lever 16 about the pivot bearing 17, the stop surface 31 of the lever 16 being in constant contact with one another to the stop screw 30. During this downward movement, the front edge 42 of the feeler foot 8 describes a curve 41, ie it is first pivoted almost horizontally from an area outside the stacking stack into the region of the stacking stack under the paper sheets (not shown) that have already been removed, in order to then pass into a substantially vertical movement range. by lowering the foot on the stack surface. This downward movement continues until the sensing foot, as shown in FIG. 3b, rests on the surface of the stack 1. While after placing the foot 8 on the surface of the stack 1, the control shaft 26 is rotated further in the same direction, whereby the drive gear consists of the levers 22, 20 and 18 of the curve contour of the curve 25 are further moved in the manner shown above, so that the stop screw 30 is lowered even further, the feeler 8 remains only on the surface of the stack due to the spring force of the spring 28. Feet 8, coupling 11, levers 14 and 31 are therefore no longer moved. As a result, the stop screw 30 moves downward from the stop surface 31 of the lever 16, as shown in Fig. 3c. The distance between the sensor and the measuring surface 33 is determined by a contactless sensor 34 via a scanning surface 33 of a lever arm 32 on the lever 31. The sensor 34 is connected via an electrical connection 35 to a measuring and evaluation device, for example a computer. From the distance between sensor 34 and measuring surface 33, the computer determines the current height of the stack in a known manner. The sheet of paper, not shown, previously raised by the lifting suction device 5, is transferred from the suction devices 6 to conveying means, not shown, of the feed table. The spring 28 is dimensioned so that the feeler just rests on the stack with such a force that a height measurement is still possible. The feeler foot prevents the currently uppermost sheet 10 of the stack 1, on which the feeler foot rests, from being carried away by the paper sheet which has already been lifted off and is carried away by the suction devices.

Zur Verbesserung dieser Separierung ist am Tastfuß 8 eine Blasdüse 36 angebracht, die mit über eine Blasluftzufuhrleitung 9 zyklisch gesteuert mit Blasluft verbunden wird. Hierdurch wird der abgehobene Bogen unterblasen. Der Berührkontakt zum Stapel kann somit besser verhindert werden.To improve this separation, a blowing nozzle 36 is attached to the sensing foot 8 and is connected to blowing air in a cyclically controlled manner via a blowing air supply line 9. This will blow off the sheet that is lifted. This makes it easier to prevent contact with the stack.

Sobald die Abtastrolle 24 die Stelle der Kurvenkontur der Kurve 25 erreicht hat, die den geringsten Abstand zur Steuerwelle 26 besitzt, wird die Anlageschraube 30 nicht mehr weiter abgesenkt. Bei Weiterdrehen der Steuerkurve nimmt der Abstand der Kontur der Kurve 25 von der Steuerwelle 26 wieder zu, so daß die Abtastrolle 24 und somit der Hebel 22 von der Steuerwelle 26 wieder weggeschwenkt wird. Dadurch wird der Hebel 18 um die Schwenkwelle 17 so verschwenkt, daß die Anschlagsschraube 30 sich nach oben bewegt. Sobald die Anschlagsfläche der Anschlagsschraube 30 in Berührkontakt zur Anschlagsfläche 31 des Hebels 16 gerät, nimmt die Anschlagsschraube 30 über ihre Anschlagsfläche und über die Anschlagsfläche 31 des Hebels 16 den Hebel 16 unter Verschwenkung um die Schwenkachse 17 nach oben mit. Hierdurch wird die Koppel 11 und der Hebel 14 ebenfalls angehoben, so daß der Hebel 14 entgegen der Federkraft der Feder 28 um das Schwenklager 15 nach oben verschwenkt wird. Der Tastfuß 8 hebt dabei von der Stapeloberfläche im wesentlichen vertikal ab und wird aus dem Bereich oberhalb des Stapels in eine Position in einem Bereich außerhalb des Stapels zurückverschwenkt. Eine solche Position ist beispielsweise in Fig. 3a dargestellt. Die Hubsauger 5 werden zyklisch in bekannter Weise wieder abgesenkt zur Aufnahme des nächsten Papierbogens vom Stapel. Hubsauger 5 und Schleppsauger 6 werden in bekannter weise über den Saugkopf mit Hilfe einer Saugluftzufuhrleitung 7 gesteuert mit Saugluft versorgt.As soon as the scanning roller 24 has reached the point on the curve contour of the curve 25 which is the smallest distance from the control shaft 26, the contact screw 30 is no longer lowered. As the control cam continues to rotate, the distance between the contour of the curve 25 and the control shaft 26 increases again, so that the scanning roller 24 and thus the lever 22 are pivoted away from the control shaft 26 again. Characterized the lever 18 is pivoted about the pivot shaft 17 so that the stop screw 30 moves upward. As soon as the stop surface of the stop screw 30 is in contact with Stop surface 31 of the lever 16, the stop screw 30 takes over its stop surface and over the stop surface 31 of the lever 16, the lever 16 with pivoting about the pivot axis 17 upwards. As a result, the coupling 11 and the lever 14 are also raised, so that the lever 14 is pivoted upward about the pivot bearing 15 against the spring force of the spring 28. The feeler foot 8 lifts essentially vertically from the stack surface and is pivoted back out of the area above the stack into a position in an area outside the stack. Such a position is shown for example in Fig. 3a. The suction cups 5 are cyclically lowered again in a known manner to receive the next sheet of paper from the stack. Lifting suction device 5 and drag suction device 6 are supplied with suction air in a known manner via the suction head with the aid of a suction air supply line 7.

Anstelle der Spiralbiegefeder 28, wie sie in Fig. 2 dargestellt ist, kann auch eine Biegefeder um die Schwenkachse 15 gewickelt werden. Der eine Federarm stützt sich dabei gegen einen im Saugkopfgehäuse befestigten Stift 38 ab, der andere Federarm stutzt sich gegen ein im Hebelarm 14 befestigten Stift 39 ab.Instead of the spiral bending spring 28, as shown in FIG. 2, a spiral spring can also be wound around the pivot axis 15. One spring arm is supported against a pin 38 fastened in the suction head housing, the other spring arm is supported against a pin 39 fastened in the lever arm 14.

Es ist auch denkbar, den Tastfuß 8 in der Koppel 11, wie in Fig. 3 dargestellt ist, verschiebbar zu befestigen. Mit bekannten, nicht dargestellten, Einstell- und Arretiermitteln kann der Tastfuß so in seiner Höhe genau eingestellt werden. Die vom Computer ermittelte Stapelhöhe dient in bekannter Weise zur zyklischen Nachstellung der Stapelhöhe. Beispielsweise kann vom Computer zyklisch ein dem gemessenen Wert entsprechendes Steuersignal für die Antriebsmittels des Hubantriebs erfolgen. Die Trennung des Antriebsgetriebes vom Führungsgetriebe ermöglicht eine einfache, leichte Bauweise des Führungsgetriebes und des Tastfußes. Die Teile können weitestgehend in Kunststoff- und/oder Aluminiumbauweise erfolgen.It is also conceivable to slidably fasten the feeler foot 8 in the coupling 11, as shown in FIG. 3. With known, not shown, setting and locking means, the height of the feeler foot can be adjusted exactly. The stack height determined by the computer is used in a known manner for cyclical adjustment of the stack height. For example, the computer can cyclically generate a control signal corresponding to the measured value for the drive means of the Lift drive take place. The separation of the drive gear from the guide gear enables a simple, lightweight construction of the guide gear and the feeler foot. The parts can be made largely of plastic and / or aluminum.

Claims (8)

  1. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine,
    - having a lever drive linkage (22, 20, 18) with a sensor roller (24), which is in constant touching contact by means of a spring (27) with a cyclically drivable drive curve (25), at least during the running of the paper,
    - having a four-bar guiding linkage with two levers (14, 16) arranged one above the other and supported in an articulated fashion in each case with one lever end on the frame, the said levers each being supported in an articulated fashion, separated from each other, with their other lever end on a coupling (11), a sensing foot (8) for sensing the stack height being fastened on a vertical extension of the coupling (11) reaching downwards,
    - having a driver stop (30) which is fastened on the drive linkage (22, 20, 18),
    - having a stop surface (31) to the driver stop (30) for the cyclic production of a touching contact for lifting the sensing foot (8) correspondingly designed and arranged on the guiding linkage and
    - having a spring (28) of which one spring hanger is fastened fixed to the machine and of which the other spring hanger is fastened on the guiding linkage and whose spring force presses the stop surface (31) in the direction towards the driver stop (30).
  2. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 1,
    - in which the driver stop (30) is supported so as to be able to pivot about a machine-fixed pivot point (17) of one (16) of the two levers (14, 16) of the guiding linkage.
  3. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 2,
    - in which the spring hanger (28) fastened on the guiding linkage is arranged on the other (14) of the two levers (14, 16) of the guiding linkage.
  4. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 1,
    - in which the lever drive linkage is a four-bar drive linkage,
    - in which two levers (22, 18) are in each case supported with one end of a lever arm about a machine-fixed pivot point (23, 17) and
    - in which these two levers (22, 18) are articulated with the other end on a common coupling (20), spaced from each other,
    - in which the machine-fixed pivot point (17) of a first (18) of the two levers (22, 18) is the machine-fixed pivot point (17) of a first (16) of the two levers (14, 16) of the guiding linkage, the driving stop (30) being arranged on this first lever (18) of the drive linkage and the corresponding stop surface (31) being arranged on this first lever (16) of the guiding linkage.
  5. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 4,
    - in which the sensing roller (24) is supported rotatably on the second (22) of the two levers (22, 18) of the four-bar drive linkage.
  6. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 1,
    - in which there is formed on the guiding linkage a sensing surface (33) which is changed in its position as a function of the height position of the sensing foot,
    - having a machine-fixed sensor device (34) for determining the position of this sensing surface (33), which is connected with an evaluating and control device for following the stack height.
  7. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claims 6 and 2,
    - in which the sensing surface (33) is designed on one (16) of the two levers (16, 14) of the guiding linkage.
  8. Sensor for the cyclic sensing of the stack height of a feed stack of a paper sheet-processing machine, especially a printing machine, according to the features of Claim 1,
    - in which the sampling foot (8) is fastened on the extension of the coupling (11) so as to be height-adjustable.
EP94104376A 1993-04-14 1994-03-19 Detector for periodically detecting pile height Expired - Lifetime EP0620173B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4312228 1993-04-14
DE4312228A DE4312228A1 (en) 1993-04-14 1993-04-14 Push button for cyclical scanning of the stack height

Publications (2)

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EP0620173A1 EP0620173A1 (en) 1994-10-19
EP0620173B1 true EP0620173B1 (en) 1997-09-03

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EP94104376A Expired - Lifetime EP0620173B1 (en) 1993-04-14 1994-03-19 Detector for periodically detecting pile height

Country Status (5)

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US (1) US5398924A (en)
EP (1) EP0620173B1 (en)
JP (1) JP2587583B2 (en)
AT (1) ATE157625T1 (en)
DE (2) DE4312228A1 (en)

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DE19755521A1 (en) * 1997-12-13 1999-06-17 Koenig & Bauer Ag Bow separator
DE19755520A1 (en) * 1997-12-13 1999-06-17 Koenig & Bauer Ag Bow separator
US6247695B1 (en) * 1998-12-23 2001-06-19 Xerox Corporation Multiple zone stack height sensor for high capacity feeder
JP4104399B2 (en) * 2002-08-28 2008-06-18 シャープ株式会社 Paper feeder
US7198265B2 (en) * 2004-08-31 2007-04-03 Lexmark International, Inc. Imaging apparatus including a movable media sensor
JP2006347701A (en) 2005-06-16 2006-12-28 Komori Corp Sheet-like article pressing device
DE102005042860B4 (en) * 2005-09-08 2009-01-08 Eastman Kodak Co. Device for determining a level of a surface of a sheet pile
JP5952865B2 (en) 2014-07-03 2016-07-13 本田技研工業株式会社 Oil level gauge assembly structure
DE102021115423A1 (en) 2021-06-15 2022-12-15 Koenig & Bauer Ag Feeder of a sheet processing machine and method for separating sheets
DE102023104999A1 (en) 2023-03-01 2024-09-05 Koenig & Bauer Ag Feeder of a sheet-processing machine and method for operating a feeder of a sheet-processing machine

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DE824954C (en) * 1950-05-18 1951-12-17 Georg Spiess Dr Ing Stacking button for controlling the stacking conveyor for sheet feeders
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Also Published As

Publication number Publication date
JP2587583B2 (en) 1997-03-05
EP0620173A1 (en) 1994-10-19
DE4312228A1 (en) 1994-10-27
JPH06305600A (en) 1994-11-01
DE59403917D1 (en) 1997-10-09
ATE157625T1 (en) 1997-09-15
US5398924A (en) 1995-03-21

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