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EP0680905A1 - Device for signal generation at a suction head - Google Patents

Device for signal generation at a suction head Download PDF

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Publication number
EP0680905A1
EP0680905A1 EP95105720A EP95105720A EP0680905A1 EP 0680905 A1 EP0680905 A1 EP 0680905A1 EP 95105720 A EP95105720 A EP 95105720A EP 95105720 A EP95105720 A EP 95105720A EP 0680905 A1 EP0680905 A1 EP 0680905A1
Authority
EP
European Patent Office
Prior art keywords
signal generation
suction device
sheet
suction
lifting
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.)
Withdrawn
Application number
EP95105720A
Other languages
German (de)
French (fr)
Inventor
Jochen Renner
Helmut Buck
Karlhein Hügel
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
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0680905A1 publication Critical patent/EP0680905A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • B65H3/0825—Suction grippers separating from the top of pile and acting on the rear part of the articles relatively to the final separating direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H7/00—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles
    • B65H7/02—Controlling article feeding, separating, pile-advancing, or associated apparatus, to take account of incorrect feeding, absence of articles, or presence of faulty articles by feelers or detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/30—Numbers, e.g. of windings or rotations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/51—Presence
    • 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
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/22—Magnetic detectors, e.g. Hall detectors
    • 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
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/23—Capacitive detectors, e.g. electrode arrangements
    • 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
    • B65H2553/20—Sensing or detecting means using electric elements
    • B65H2553/24—Inductive detectors
    • 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
    • B65H2553/30—Sensing or detecting means using acoustic or ultrasonic elements
    • 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
    • B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements

Definitions

  • the invention relates to a device for generating signals on a suction head, with a lifting suction device which can be moved up and down and performs a starting movement and is driven by a suction gear, and with a feeler foot which is driven by a feeler foot mechanism, wherein the suction device and feeler foot are driven in the work cycle of the sheet separation are to feed individual sheets on the top of a stack of further transport devices.
  • DE 40 09 175 A1 discloses an elastic lifting nozzle and button mounting for sheet feeders.
  • both a feeler foot and a plurality of lifting nozzles accommodated on a crossbeam are each assigned an articulated drive which can be moved by a cam disk.
  • An electropneumatic control device for sheet feeders is known from DT 25 44 618 A1.
  • a vacuum-actuated unit consisting of a piston / cylinder arrangement is integrated into a vacuum system, but is separated from sheet separation nozzles.
  • an actuating element is fastened which interacts with a measuring transducer mounted on the frame. If the vacuum is present in the line system, the piston is pulled into the cylinder and an actuating element attached to it causes a change in state in the transmitter. If no elbow is sucked in, the vacuum is not sufficient to move the piston together with the actuating element against the force of a compression spring in order to change the state of the transmitter.
  • a separating suction device for a feeder of a printing press has become known from DE 37 43 805 C1.
  • This comprises at least one scanning device containing a first and a second sensor, by means of which a curved surface of an edge region of the sheet stack can be scanned at two different measuring locations.
  • the sensors are designed as contactless sensors that can be used both above and to the side of the sheet stack.
  • the at least two sensors can be designed to be vertically adjustable with respect to one another. By means of the signals supplied by the sensors, a height difference prevailing on the top of the stack can be detected and an inclination of the suction grippers adapted to it can be achieved.
  • This sensor system designed according to DE 37 43 805 C1, is a sensor system that can be adjusted vertically within certain limits, but is essentially stationary, since a difference must be formed between signals at two measuring locations, each of which is assigned a sensor.
  • the sheet After the sheet is separated on a stack of feeders and during the subsequent feed to the first printing unit of a rotary printing press, it is customary to convey the sheets in a shingled formation.
  • the first sheet is aligned with the front and side marks of the feed table before it accelerates to machine speed via pre-grippers into the first printing unit comes in.
  • the shingled sheets In a shingled formation, the shingled sheets are only fixed with a part of their contact surface on a suction belt table, so that the acting frictional forces allow alignment with the front and side marks.
  • the problem with the last sheet of a shingled sheet formation is that it lies on the suction belt table with its entire surface in the area of the front marks, since there is no predecessor and no successor. This has the consequence that undesirable side effects such.
  • this sheet can set a deformation of this last sheet on the front brands due to the high frictional forces.
  • this sheet is no longer guaranteed to be in register; furthermore, the deformation of this sheet can trigger a machine stop which negatively affects all sheets in the printing units of the printing press at this point in terms of their printing quality influenced.
  • the present invention is based on the task of generating a signal indicating a last sheet with simple means.
  • An advantage of this solution is the fact that the lifting nozzle performing a pneumatic starting movement can be used to detect a last sheet.
  • the device for signal generation can be designed to be extremely simple.
  • the recognition of the last sheet is independent of the properties of the printing material, some of which differ considerably from one another. Since the relative movement between a lifting suction device picked up on the suction head with means for signal generation attached to it and a means for signal generation that is stationarily arranged with respect to the lifting suction device, an early detection of the last sheet is ensured before it reaches the front marks of a feed table.
  • a means for signal generation which cooperates with the means for signal generation accommodated on the lifting suction device is stationary.
  • a signal is generated in a contactless manner between the means for signal generation. This eliminates the soiling problem caused by paper dust.
  • the means for signal generation received on the lifting suction device is positioned above the suction surface of the lifting suction device in order to achieve a prompt response of the means for signal generation when the lifting suction device remains in its extended position.
  • the means for signal generation accommodated on the lifting suction device can extend both in a ring around the axis of symmetry, and can also be arranged distributed at individual or several locations.
  • the stationary means for generating signals is preferably designed in the form of a pin protruding from the suction lifter without touching it.
  • the means for signal generation can be designed to be magnetically active and in this way enable signal generation, wherein signal generation by inductive means would also be conceivable.
  • a configuration of the means for signal generation is conceivable, which comprise optoelectric components with a corresponding emitter; other sensor principles, such as ultrasound or a capacitive sensor system, would also be conceivable.
  • FIG. 1 shows a suction head, in which both a suction gear 2 and a feeler foot mechanism 3 are accommodated, which generate the movement of a lifting suction device 11 or a feeler foot 7.
  • the gears are only indicated here and are not the subject of the present invention.
  • a cam piece 4 is mounted, on which the cam roller of a linkage 5 runs.
  • the suction cup 11 is fastened to the articulation 5 and can be moved about a pivot axis 6.
  • the suction lifter 11 is in the retracted position, conveying a single sheet 10 in conveyor rollers 8, which are arranged above a feed table, not shown.
  • the height of a sheet stack 9 is scanned by means of the feeler foot 7 and its tracking is controlled during the continuous processing.
  • a suction surface 12 is arranged on the lifting suction device 11 and, as a result of the up and down movement of the lifting suction device 11, assumes either a raised position 13 with a single sheet 10 or an extended position 14 without a single sheet 10.
  • means for signal generation 17 are received on the lifting suction device 11.
  • This means of Signal generation 17 can extend as a closed ring around the axis of symmetry of the suction lifter 11, so that a rotation of the lifting suction device 11 has no consequences for the signal generation.
  • the signal-generating surfaces of the means for signal generation 17 can each be arranged offset by 90 ° or 120 °, or other angular divisions on the circumferential surface of the suction lifter 11.
  • the means for signal generation furthermore comprise a sensor 16, which is arranged in a stationary position with respect to the lifting suction device 11 and protrudes from the lifting suction device 11.
  • 15 denotes the movement path which describes the suction surface 12 with the single sheet 10 sucked in.
  • the horizontal component of the movement path 15 essentially follows the course specified by the curve piece 4.
  • the lifting suction device 11 executes a vertically directed movement which is used for signal generation.
  • the vertical movement, the light-off movement is generated by applying a vacuum.
  • the lifting suction device 11 is alternately moved back and forth between the retracted position 13 and the extended position 14 after the sheet has been picked up.
  • the time required for this depends on the machine speed set in each case.
  • the signal-generating surface 17 moves into the area of the sensor 16
  • a signal or a pulse is generated because the lifting suction device 11 together with the gripped single sheet 10 has moved into the retracted position 13 relative to the sensor 16.
  • the suction cup 11 swings back into the stacking area and tries to separate a next sheet.
  • the suction surface 12 of the lifting suction device 11 can accordingly not be closed by a suctioned bow, whereby the lifting suction device 11 remains in its extended position 14. Thus, no signal can be generated between the means for signal generation 16, 17.
  • the signal generation therefore only depends on the position of the sucker and is therefore independent of the nature of the substrate to be processed.
  • the early detection of the last sheet allows simple means to solve the problem presented in the introduction, since it is now possible in time to adapt, for example, the vacuum in a suction belt table of a sheet feeder to the requirements of processing the last sheet. If its deformation or misalignment triggers a machine stop, for example, not only the last sheet, but all sheets currently in the rotary printing press are defective and can be attributed to the waste. If, on the other hand, timely adjustment of machine parameters such as the negative pressure in the feed table to the processing requirements of the last sheet is taken care of, consistent quality can be produced down to the last sheet.
  • FIG. 2 shows a lifting suction device 11 which, in an inclined position 22, can be inclined on both sides by a few angular degrees.
  • the inclined position of the suction lifter 11 is indicated by the dashed representation of the means for signal generation 17 relative to the sensor 16. Since a reliable signal generation can be carried out even with a slightly inclined lifting suction device 11, an inclination of the lifting suction device 11, which is required, for example, when processing critical printing materials, influences the timely recognition of the last sheet is not.
  • a retaining plate 21 is fastened to the suction device 11 with screws 20, on which the suction device 11 strikes in the maximally extended position.
  • FIG. 3 shows a lifting suction device picked up on a swivel axis in the retracted and extended position.
  • the lifting suction device 11, to which the holding plate 21 is fastened by screws 20, can also be moved in relation to the pivot axis 6 after loosening a clamping screw 23 and then fixing it. With these adjustments, the signal-generating areas of the means for signal generation 17 assume the positions designated 18 and 19. Since even these are still opposite the sensor 16, an adjustment of the lifting suction device 11 relative to the pivot axis 6 is also possible. Individual measures to increase the supply security at the suction head 1 are therefore possible at any time and do not reduce the functional reliability of the means for signal generation 16, 17.
  • a magnet or a ring-shaped magnet would be conceivable as means for signal generation 17, inductively operating sensors as well as sensors which comprise a photodiode or the like. Since a signal is generated in a contactless manner, the problem of contamination by paper dust can be eliminated by the sensors or sensor principles listed above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Controlling Sheets Or Webs (AREA)

Abstract

The sheet handling system has a suction pick-up (14) which is brought into contact with the top sheet of a stack (9) to transfer same to the processing stages. The pick-up head has a movable mounting to retract the head slightly when a sheet is picked up. If no sheet remains to be lifted then the head stays in the lower position and the processor control identifies an empty sheet tray, and adjusts the processing accordingly. The movement of the pick-up head inside the loose mounting is monitored by out of contact sensors e.g. magnetic, inductive etc.. One part of the sensor has a fixed mounting while the other is attached to the suction head. An optimum sensor has a ring shape about the pivot axis of the suction head. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zur Signalerzeugung an einem Saugkopf, mit einem auf- und abbewegbaren eine Anspringbewegung ausführenden Hubsauger, der durch ein Saugergetriebe angetrieben ist, sowie mit einem Tastfuß, welcher durch ein Tastfußgetriebe angetrieben ist, wobei Hubsauger und Tastfuß im Arbeitstakt der Bogenvereinzelung angetrieben sind, um auf der Oberseite eines Stapels vereinzelte Bogen Weitertransporteinrichtungen zuzuführen.The invention relates to a device for generating signals on a suction head, with a lifting suction device which can be moved up and down and performs a starting movement and is driven by a suction gear, and with a feeler foot which is driven by a feeler foot mechanism, wherein the suction device and feeler foot are driven in the work cycle of the sheet separation are to feed individual sheets on the top of a stack of further transport devices.

Der Stand der Technik, DE 40 09 175 A1, offenbart eine elastische Hubdüsen- und Tasterlagerung für Bogenanleger. Bei dieser Vorrichtung sind sowohl einem Tastfuß als auch mehreren an einer Traverse aufgenommenen Hubdüsen je ein durch eine Kurvenscheibe bewegbarer Gelenkantrieb zugeordnet.The prior art, DE 40 09 175 A1, discloses an elastic lifting nozzle and button mounting for sheet feeders. In this device, both a feeler foot and a plurality of lifting nozzles accommodated on a crossbeam are each assigned an articulated drive which can be moved by a cam disk.

Aus DT 25 44 618 A1 ist eine elektropneumatische Kontrolleinrichtung für Bogenanleger bekannt. Um eine Reduzierung bewegter Massen Zu erreichen, ist eine vakuumbeaufschlagte Einheit, bestehend aus einer Kolben/Zylinderanordnung in ein Vakuumsystem eingebunden, jedoch von Bogenvereinzelungsdüsen getrennt. Am Kolben, der in der vakuumbeaufschlagten Einheit bewegbar aufgenommen ist, ist ein Betätigungselement befestigt, welches mit einem gestellfest gelagerten Meßumformer zusammenwirkt. Steht das Vakuum im Leitungssystem an, wird der Kolben in den Zylinder gezogen und ein daran befestigtes Betätigungselement bewirkt eine Zustandsänderung im Meßumformer. Wird kein Bogen angesaugt, reicht das Vakuum nicht aus, den Kolben samt Betätigungselement entgegen der Kraft einer Druckfeder zu bewegen, um am Meßumformer eine Zustandsänderung zu bewirken. Der Nachteil dieser Einrichtung ist darin zu sehen, daß erst dann eine Zustandsänderung am Meßumformer erzeugt werden kann, wenn das anstehende Vakuum ausreichend ist, den massebehafteten Kolben entgegen der Druckfeder zu bewegen. Hinzu kommt der relativ lange, vom Betätigungselement zurückzulegende Stellweg. Die Entkoppelung der vakuumbeaufschlagten Einheit von den Bogenvereinzelungsdüsen gestattet zwar eine Reduzierung der zu bewegenden Massen, jedoch muß dies mit unerwünscht langen Anspruchszeiten am Meßumformer erkauft werden.An electropneumatic control device for sheet feeders is known from DT 25 44 618 A1. In order to achieve a reduction in moving masses, a vacuum-actuated unit consisting of a piston / cylinder arrangement is integrated into a vacuum system, but is separated from sheet separation nozzles. On the piston, which is movably received in the vacuum-loaded unit, an actuating element is fastened which interacts with a measuring transducer mounted on the frame. If the vacuum is present in the line system, the piston is pulled into the cylinder and an actuating element attached to it causes a change in state in the transmitter. If no elbow is sucked in, the vacuum is not sufficient to move the piston together with the actuating element against the force of a compression spring in order to change the state of the transmitter. The disadvantage of this device is the fact that only then a change in state can be generated on the transmitter if the vacuum present is sufficient to move the mass-laden piston against the compression spring. In addition, there is the relatively long travel distance to be covered by the actuating element. The decoupling of the vacuum-loaded unit from the sheet separating nozzles allows a reduction in the masses to be moved, but this must be bought with undesirably long claims on the transmitter.

Schließlich ist aus DE 37 43 805 C1 eine Trennsaugereinrichtung für einen Anleger einer Druckmaschine bekannt geworden. Diese umfaßt wenigstens eine einen ersten und einen zweiten Sensor beinhaltende Abtasteinrichtung, mittels welcher eine gekrümmte Oberfläche eines Randbereiches des Bogenstapels an zwei verschiedenen Meßorten abtastbar ist. Die Sensoren sind dabei als berührungslos arbeitende Sensoren gestaltet, die sowohl oberhalb als auch seitlich des Bogenstapels einsetzbar sind. Darüberhinaus können die wenigstens zwei Sensoren vertikal zueinander verstellbar ausgebildet werden. Mittels der von den Sensoren gelieferten Signale ist eine an der Stapeloberseite herrschende Höhendifferenz detektierbar und eine daran angepaßte Neigung der Sauggreifer erzielbar. Diese gemäß DE 37 43 805 C1 gestaltete Sensorik ist eine zwar in Grenzen vertikal verstellbare, jedoch im wesentlichen stationäre Sensorik, da eine Differenz zwischen Signalen an zwei Meßorten zu bilden ist, denen jeweils ein Sensor zugeordnet ist.Finally, a separating suction device for a feeder of a printing press has become known from DE 37 43 805 C1. This comprises at least one scanning device containing a first and a second sensor, by means of which a curved surface of an edge region of the sheet stack can be scanned at two different measuring locations. The sensors are designed as contactless sensors that can be used both above and to the side of the sheet stack. In addition, the at least two sensors can be designed to be vertically adjustable with respect to one another. By means of the signals supplied by the sensors, a height difference prevailing on the top of the stack can be detected and an inclination of the suction grippers adapted to it can be achieved. This sensor system, designed according to DE 37 43 805 C1, is a sensor system that can be adjusted vertically within certain limits, but is essentially stationary, since a difference must be formed between signals at two measuring locations, each of which is assigned a sensor.

Nach der Bogenvereinzelung auf einem Anlegerstapel und während der danach erfolgenden Zufuhr zu dem ersten Druckwerk einer Rotationsdruckmaschine, ist es üblich, die Bogen in geschuppter Formation zu fördern. Der jeweils erste Bogen wird an Vorder- und Seitenmarke des Anlegetisches ausgerichtet, bevor er über Vorgreifer auf Maschinengeschwindigkeit beschleunigt, in das erste Druckwerk einläuft. In geschuppter Formation werden die jeweils unterschuppt geförderten Bogen nur mit einem Teil ihrer Auflagefläche auf einem Saugbändertisch fixiert, so daß die wirkenden Reibkräfte eine Ausrichtung an Vorder- und Seitenmarke zulassen. Bei dem letzten Bogen einer unterschuppt geförderten Bogenformation stellt sich das Problem, daß dieser - da ohne Vorgänger und ohne Nachfolger - im Bereich der Vordermarken mit seiner gesamten Fläche auf dem Saugbändertisch aufliegt. Dies hat zur Folge, daß sich unerwünschte Nebeneffekte, wie z. B. eine Verformung dieses letzten Bogens an den Vordermarken aufgrund der hohen Reibungskräfte einstellen können. Darüberhinaus ist bei Verformung des letzten Bogens an den Vordermarken eine Passerhaltigkeit dieses Bogens nicht mehr gewährleistet, des weiteren kann durch die Verformung dieses Bogens ein Maschinenstop ausgelöst werden, der sämtliche zu diesem Zeitpunkt in den Druckwerken der Druckmaschine befindliche Bogen, was ihre Bedruckqualität betrifft, negativ beeinflußt.After the sheet is separated on a stack of feeders and during the subsequent feed to the first printing unit of a rotary printing press, it is customary to convey the sheets in a shingled formation. The first sheet is aligned with the front and side marks of the feed table before it accelerates to machine speed via pre-grippers into the first printing unit comes in. In a shingled formation, the shingled sheets are only fixed with a part of their contact surface on a suction belt table, so that the acting frictional forces allow alignment with the front and side marks. The problem with the last sheet of a shingled sheet formation is that it lies on the suction belt table with its entire surface in the area of the front marks, since there is no predecessor and no successor. This has the consequence that undesirable side effects such. B. can set a deformation of this last sheet on the front brands due to the high frictional forces. In addition, if the last sheet is deformed at the front marks, this sheet is no longer guaranteed to be in register; furthermore, the deformation of this sheet can trigger a machine stop which negatively affects all sheets in the printing units of the printing press at this point in terms of their printing quality influenced.

Ausgehend vom skizzierten Stand der Technik und dem aufgezeigten Problemfeld, liegt der vorliegenden Erfindung die Aufgabe zugrunde, mit einfachen Mitteln ein einen letzten Bogen anzeigendes Signal zu generieren.Starting from the outlined state of the art and the problem area shown, the present invention is based on the task of generating a signal indicating a last sheet with simple means.

Erfindungsgemäß wird diese Aufgabe gemäß den Merkmalen des Patentanspruches 1 gelöst.According to the invention this object is achieved according to the features of claim 1.

Von Vorteil bei dieser Lösung ist der Umstand, daß die eine pneumatische Anspringbewegung ausführende Hubdüse zur Detektion eines letzten Bogens ausgenutzt werden kann. Dadurch kann die Vorrichtung zur Signalerzeugung extrem einfach ausgestaltet werden. Ferner ist die Erkennung des letzten Bogens unabhängig von Bedruckstoffbeschaffenheiten, die zum Teil erheblich voneinander differieren. Da die Relativbewegung zwischen einem am Saugkopf aufgenommenen Hubsauger mit daran befestigtem Mittel zur Signalerzeugung und einem, bezogen auf den Hubsauger stationär abgeordneten Mittel zur Signalerzeugung erfolgt, ist eine frühzeitige Erkennung des letzten Bogens gewährleistet, bevor dieser die Vordermarken eines Anlegetisches erreicht.An advantage of this solution is the fact that the lifting nozzle performing a pneumatic starting movement can be used to detect a last sheet. As a result, the device for signal generation can be designed to be extremely simple. Furthermore, the recognition of the last sheet is independent of the properties of the printing material, some of which differ considerably from one another. Since the relative movement between a lifting suction device picked up on the suction head with means for signal generation attached to it and a means for signal generation that is stationarily arranged with respect to the lifting suction device, an early detection of the last sheet is ensured before it reaches the front marks of a feed table.

In Ausgestaltung des der Erfindung zugrunde liegenden Gedankens ist ein mit dem am Hubsauger aufgenommenen Mittel zur Signalerzeugung jeweils zusammenarbeitendes Mittel zur Signalerzeugung stationär aufgenommen. Zwischen den Mitteln zur Signalerzeugung erfolgt die Generierung eines Signals auf berührungslosem Wege. Damit ist das Verschmutzungsproblem durch Papierstaub eliminiert.In an embodiment of the idea on which the invention is based, a means for signal generation which cooperates with the means for signal generation accommodated on the lifting suction device is stationary. A signal is generated in a contactless manner between the means for signal generation. This eliminates the soiling problem caused by paper dust.

Das am Hubsauger aufgenommene Mittel zur Signalerzeugung ist oberhalb der Saugerfläche des Hubsaugers positioniert, um ein promptes Ansprechen der Mittel zur Signalerzeugung zu erreichen, wenn der Hubsauger in seiner ausgefahrenen Lage verbleibt. Die am Hubsauger aufgenommenen Mittel zur Signalerzeugung können sich sowohl ringförmig um die Symmetrieachse erstrecken, als auch an einzelnen oder mehreren Stellen verteilt angeordnet sein. Das stationär gelagerte Mittel zur Signalerzeugung ist vorzugsweise stiftförmig an den Hubsauger heranragend ausgeführt, ohne diesen zu berühren.The means for signal generation received on the lifting suction device is positioned above the suction surface of the lifting suction device in order to achieve a prompt response of the means for signal generation when the lifting suction device remains in its extended position. The means for signal generation accommodated on the lifting suction device can extend both in a ring around the axis of symmetry, and can also be arranged distributed at individual or several locations. The stationary means for generating signals is preferably designed in the form of a pin protruding from the suction lifter without touching it.

Die Mittel zur Signalerzeugung können magnetisch wirkend ausgeführt sein und auf diese Weise eine Signalerzeugung ermöglichen, wobei auch eine Signalerzeugung auf induktivem Wege denkbar wäre. Desweiteren ist eine Ausgestaltung der Mittel zur Signalerzeugung denkbar, die optoelektrische Bauteile mit einem entsprechenden Emitter umfassen; auch andere Sensorprinzipien, wie etwa Ultraschall oder eine kapazitiv arbeitende Sensorik wären denkbar.The means for signal generation can be designed to be magnetically active and in this way enable signal generation, wherein signal generation by inductive means would also be conceivable. Furthermore, a configuration of the means for signal generation is conceivable, which comprise optoelectric components with a corresponding emitter; other sensor principles, such as ultrasound or a capacitive sensor system, would also be conceivable.

Anhand einer Zeichnung sei die vorstehende Erfindung detailliert erläutert.The above invention is explained in detail with reference to a drawing.

Es zeigt:

Fig. 1
den Bereich oberhalb des Bogenstapels mit in ein- und ausgefahrenem Zustand positionierten Hubsauger,
Fig. 2
einen Schnitt durch ein schrägstellbaren Hubsauger und
Fig. 3
einen Hubsauger in seiner ein- und ausgefahrenen Position, wobei Grenzpositionen dargestellt sind, in welchen noch eine Signalgenerierung möglich ist.
It shows:
Fig. 1
the area above the sheet stack with the lifting suction device positioned in the extended and retracted state,
Fig. 2
a section through an inclinable vacuum and
Fig. 3
a suction lifter in its retracted and extended position, limit positions are shown in which a signal generation is still possible.

Die Darstellung nach Figur 1 zeigt einen Saugkopf , in welchem sowohl ein Saugergetriebe 2 als auch ein Tastfußgetriebe 3 aufgenommen sind, die die Bewegung eines Hubsaugers 11 bzw. eines Tastfußes 7 erzeugen. Die Getriebe sind hier lediglich angedeutet und nicht Gegenstand der vorliegenden Erfindung. Am Saugergetriebe 2 ist ein Kurvenstück 4 gelagert, auf dem die Kurvenrolle einer Anlenkung 5 abläuft. An der Anlenkung 5 ist der Hubsauger 11 befestigt, der um eine Schwenkachse 6 bewegbar ist. Im dargestellten Zustand befindet sich der Hubsauger 11 in eingefahrener Position, einen Einzelbogen 10 in Förderwalzen 8 fördernd, die oberhalb eines nicht näher dargestellten Anlegetisches angeordnet sind. Mittels des Tastfußes 7 wird unter anderem die Höhe eines Bogenstapels 9 abgetastet und dessen Nachführung während der kontinuierlichen Abarbeitung gesteuert.The illustration according to FIG. 1 shows a suction head, in which both a suction gear 2 and a feeler foot mechanism 3 are accommodated, which generate the movement of a lifting suction device 11 or a feeler foot 7. The gears are only indicated here and are not the subject of the present invention. On the suction gear 2, a cam piece 4 is mounted, on which the cam roller of a linkage 5 runs. The suction cup 11 is fastened to the articulation 5 and can be moved about a pivot axis 6. In the state shown, the suction lifter 11 is in the retracted position, conveying a single sheet 10 in conveyor rollers 8, which are arranged above a feed table, not shown. Among other things, the height of a sheet stack 9 is scanned by means of the feeler foot 7 and its tracking is controlled during the continuous processing.

Am Hubsauger 11 ist eine Saugerfläche 12 angeordnet, welche in Folge der Auf- und Abbewegung des Hubsaugers 11 entweder eine angehobene Position 13 mit Einzelbogen 10 oder eine ausgefahrene Position 14 ohne einen Einzelbogen 10 einnimmt. Oberhalb der Saugfläche 12 sind am Hubsauger 11 Mittel zur Signalerzeugung 17 aufgenommen. Diese Mittel zur Signalerzeugung 17 können sich als geschlossener Ring um die Symmetrieachse des Hubsaugers 11 erstrecken, so daß eine Verdrehung des Hubsaugers 11 ohne Folgen für die Signalerzeugung bleibt. Andererseits können die signalgenerierenden Flächen der Mittel zu Signalerzeugung 17 jeweils um 90° bzw. 120° , oder andere Winkelteilungen auf der Umfangsfläche des Hubsaugers 11 zueinander versetzt angeordnet sein. Die Mittel zur Signalerzeugung umfassen ferner einen Sensor 16, der bezogen auf den Hubsauger 11 in einer stationären Position an den Hubsauger 11 heranragend angeordnet ist. Mit 15 ist die Bewegungsbahn bezeichnet, welche die Saugerfläche 12 mit angesaugtem Einzelbogen 10 beschreibt. Die horizontale Komponente der Bewegungsbahn 15 folgt im wesentlichen dem durch das Kurvenstück 4 vorgegebenen Verlauf. Zu Beginn der Bewegungsbahn 15 führt der Hubsauger 11 eine vertikal gerichtete Bewegung aus, welche zur Signalgenerierung ausgenutzt wird. Die vertikal gerichtete Bewegung , die Anspringbewegung wird durch Unterdruckbeaufschlagung erzeugt.A suction surface 12 is arranged on the lifting suction device 11 and, as a result of the up and down movement of the lifting suction device 11, assumes either a raised position 13 with a single sheet 10 or an extended position 14 without a single sheet 10. Above the suction surface 12, means for signal generation 17 are received on the lifting suction device 11. This means of Signal generation 17 can extend as a closed ring around the axis of symmetry of the suction lifter 11, so that a rotation of the lifting suction device 11 has no consequences for the signal generation. On the other hand, the signal-generating surfaces of the means for signal generation 17 can each be arranged offset by 90 ° or 120 °, or other angular divisions on the circumferential surface of the suction lifter 11. The means for signal generation furthermore comprise a sensor 16, which is arranged in a stationary position with respect to the lifting suction device 11 and protrudes from the lifting suction device 11. 15 denotes the movement path which describes the suction surface 12 with the single sheet 10 sucked in. The horizontal component of the movement path 15 essentially follows the course specified by the curve piece 4. At the beginning of the movement path 15, the lifting suction device 11 executes a vertically directed movement which is used for signal generation. The vertical movement, the light-off movement is generated by applying a vacuum.

Bei kontinuierlicher Bogenvereinzelung vom Bogenstapel 9 wird der Hubsauger 11 nach der Bogenaufnahme abwechselnd zwischen der eingefahrenen Position 13 und der ausgefahrenen Position 14 hin- und herbewegt. Die dafür erforderliche Zeitspanne ist abhängig von der jeweils eingestellten Maschinengeschwindigkeit. Somit wird, sobald sich die signalgenerierende Fläche 17 in den Bereich des Sensors 16 bewegt, ein Signal oder ein Impuls generiert, da sich der Hubsauger 11 samt ergriffenem Einzelbogen 10 in die eingefahrene Position 13 gegenüber dem Sensor 16 bewegt hat. Nach Förderung des letzten zu verarbeitenden Bogens 10 durch die Hubsauger 11 in die Förderwalzen 8 oberhalb eines nachgeordneten Anlegetisches schwenkt der Hubsauger 11 in den Stapelbereich zurück und versucht einen nächsten Bogen zu vereinzeln. Da kein Bogen mehr auf der Stapelfläche vorhanden ist, kann die Saugerfläche 12 des Hubsaugers 11 demzufolge nicht durch einen angesaugten Bogen verschlossen werden, wodurch der Hubsauger 11 in seiner ausgefahrenen Position 14 bleibt. Somit kann zwischen den Mitteln zur Signalerzeugung 16, 17 kein Signal erzeugt werden.In the case of continuous sheet separation from the sheet stack 9, the lifting suction device 11 is alternately moved back and forth between the retracted position 13 and the extended position 14 after the sheet has been picked up. The time required for this depends on the machine speed set in each case. Thus, as soon as the signal-generating surface 17 moves into the area of the sensor 16, a signal or a pulse is generated because the lifting suction device 11 together with the gripped single sheet 10 has moved into the retracted position 13 relative to the sensor 16. After conveying the last sheet 10 to be processed by the suction cups 11 into the conveyor rollers 8 above a downstream feed table, the suction cup 11 swings back into the stacking area and tries to separate a next sheet. Since there is no longer any sheet on the stacking surface, the suction surface 12 of the lifting suction device 11 can accordingly not be closed by a suctioned bow, whereby the lifting suction device 11 remains in its extended position 14. Thus, no signal can be generated between the means for signal generation 16, 17.

Das Verharren des Hubsaugers 11 in seiner ausgefahrenen Position 14 zeigt zuverlässig an, daß es sich beim vorhergehenden noch geförderten Einzelbogen 10 um den letzten Bogen gehandelt hat. Die Signalerzeugung hängt damit lediglich von der Saugerposition ab und ist somit unabhängig von der Beschaffenheit des zu verarbeitenden Bedruckstoffes. Die frühzeitige Erkennung des letzten Bogens gestattet es mit einfachen Mitteln, die in der Einleitung aufgezeigte Problematik zu lösen, da es nunmehr rechtzeitig möglich ist, beispielsweise den Unterdruck in einem Saugbändertisch eines Bogenanlegers an die Anforderungen der Verarbeitung des letzten Bogens anzupassen. Löst dessen Verformung oder Fehlausrichtung an den Vordermarken beispielsweise einen Maschinenstop aus, sind nicht nur der letzte Bogen sondern sämtliche zu diesem Zeitpunkt in der Rotationsdruckmaschine befindlichen Bogen mit Mängel behaftet und der Makulatur zuzurechnen. Wird hingegen durch rechtzeitiges Anpassen von Maschinenparametern wie beispielsweise dem Unterdruck in Anlegetisch an die Verarbeitungsanforderungen des letzten Bogens Sorge getragen, kann bis zum letzten Bogen eine gleichbleibende Qualität produziert werden.The fact that the lifting suction device 11 remains in its extended position 14 reliably indicates that the previous single sheet 10 which was still being conveyed was the last sheet. The signal generation therefore only depends on the position of the sucker and is therefore independent of the nature of the substrate to be processed. The early detection of the last sheet allows simple means to solve the problem presented in the introduction, since it is now possible in time to adapt, for example, the vacuum in a suction belt table of a sheet feeder to the requirements of processing the last sheet. If its deformation or misalignment triggers a machine stop, for example, not only the last sheet, but all sheets currently in the rotary printing press are defective and can be attributed to the waste. If, on the other hand, timely adjustment of machine parameters such as the negative pressure in the feed table to the processing requirements of the last sheet is taken care of, consistent quality can be produced down to the last sheet.

Figur 2 zeigt einen Hubsauger 11, der in einer Schrägstellung 22 um einige Winkelgrade beidseitig schrägstellbar ist. Die Schrägstellung des Hubsaugers 11 ist durch die gestrichelte Wiedergabe des Mittels zur Signalerzeugung 17 gegenüber des Sensors 16 angedeutet. Da sich selbst bei leicht schräggestelltem Hubsauger 11 eine zuverlässige Signalerzeugung durchführen läßt, beeinflußt eine beispielsweise bei der Verarbeitung kritischer Bedruckstoffe erforderliche Schrägstellung der Hubsauger 11 die rechtzeitige Erkennung des letzten Bogens nicht. Mit Schrauben 20 ist ein Halteblech 21 am Hubsauger 11 befestigt, an welchem der Hubsauger 11 in maximal ausgefahrener Position anschlägt.FIG. 2 shows a lifting suction device 11 which, in an inclined position 22, can be inclined on both sides by a few angular degrees. The inclined position of the suction lifter 11 is indicated by the dashed representation of the means for signal generation 17 relative to the sensor 16. Since a reliable signal generation can be carried out even with a slightly inclined lifting suction device 11, an inclination of the lifting suction device 11, which is required, for example, when processing critical printing materials, influences the timely recognition of the last sheet is not. A retaining plate 21 is fastened to the suction device 11 with screws 20, on which the suction device 11 strikes in the maximally extended position.

Figur 3 zeigt einen an einer Schwenkachse aufgenommenen Hubsauger in ein- und ausgefahrener Position.FIG. 3 shows a lifting suction device picked up on a swivel axis in the retracted and extended position.

Der Hubsauger 11 an dem das Halteblech 21 durch Schrauben 20 befestigt ist, kann nach Lösen einer Klemmschraube 23 und deren anschließender Fixierung auch bezogen auf die Schwenkachse 6 bewegt werden. Bei diesen Verstellungen nehmen die signalerzeugenden Flächen der Mittel zur Signalerzeugung 17 die mit 18 und 19 bezeichneten Positionen ein. Da selbst diese noch gegenüber dem Sensor 16 liegen, ist eine Verstellung des Hubsaugers 11 relativ zur Schwenkachse 6 ebenfalls möglich. Somit sind vom Drucker durchzuführende Individualmaßnahmen zur Erhöhung der Zufuhrsicherheit am Saugkopf 1 jederzeit möglich und vermindern die Funktionssicherheit der Mittel zur Signalerzeugung 16, 17 nicht. Als Mittel zur Signalerzeugung 17 wären beispielsweise ein Magnet, oder ein ringförmiger Magnet denkbar, induktiv arbeitende Sensoren ebenso wie Sensoren, die eine Photodiode oder ähnliches umfassen. Da eine Signalerzeugung auf berührungslosem Wege erfolgt, kann durch die oben aufgezählten Sensoren bzw. Sensorprinzipien das Problem der Verschmutzung durch Papierstaub ausgeschaltet werden.The lifting suction device 11, to which the holding plate 21 is fastened by screws 20, can also be moved in relation to the pivot axis 6 after loosening a clamping screw 23 and then fixing it. With these adjustments, the signal-generating areas of the means for signal generation 17 assume the positions designated 18 and 19. Since even these are still opposite the sensor 16, an adjustment of the lifting suction device 11 relative to the pivot axis 6 is also possible. Individual measures to increase the supply security at the suction head 1 are therefore possible at any time and do not reduce the functional reliability of the means for signal generation 16, 17. A magnet or a ring-shaped magnet would be conceivable as means for signal generation 17, inductively operating sensors as well as sensors which comprise a photodiode or the like. Since a signal is generated in a contactless manner, the problem of contamination by paper dust can be eliminated by the sensors or sensor principles listed above.

BezugszeichenlisteReference list

11
SaugkopfSuction head
22nd
SaugergetriebeSuction gear
33rd
TastfußgetriebeTactile foot gear
44th
KurvenstückCurve piece
55
AnlenkungArticulation
66
SchwenkachseSwivel axis
77
TastfußFeet
88th
FörderwalzenConveyor rollers
99
BogenstapelSheet stack
1010th
EinzelbogenSingle sheet
1111
HubsaugerSuction cups
1212th
SaugerflächeSuction surface
1313
angehobene Position (mit Bogen)raised position (with bow)
1414
ausgefahrene Position (ohne Bogen)extended position (without bow)
1515
BewegungsbahnTrajectory
1616
Sensorsensor
1717th
Magnetmagnet
1818th
obere Grenzpositionupper limit position
1919th
untere Grenzpositionlower limit position
2020th
Schraubescrew
2121
HalteblechBracket
2222
SchrägstellungInclination
2323
KlemmschraubeClamping screw

Claims (12)

Vorrichtung zur Signalerzeugung an einem Saugkopf mit mindestens eine: auf- und abbewegbaren Hubsauger, eine Anspringbewegung ausführenden Hubsauger, der durch ein Saugergetriebe angetrieben ist, sowie mit einem Tastfuß, welcher durch ein Tastfußgetriebe angetrieben ist und Hubsauger sowie Tastfuß im Arbeitstakt der Bogenvereinzelung angetrieben sind, um auf der Oberseite eines Stapels vereinzelte Bogen Weitertransporteinrichtungen zuzuführen,
dadurch gekennzeichnet,
daß im oberen Bereich des Bogenstapels (9) Mittel zur Signalerzeugung (16, 17) angeordnet sind, von welchen eines mit dem Hubsauger (11) bewegbar ist.Device for generating signals on a suction head with at least one: lifting suction device that can be moved up and down, a lifting suction device that performs a light-off movement and is driven by a suction gear, and with a feeler foot that is driven by a feeler foot mechanism and that the suction device and feeler foot are driven in the work cycle of the sheet separation, to feed individual sheets on the top of a stack,
characterized,
that means for signal generation (16, 17) are arranged in the upper region of the sheet stack (9), one of which can be moved with the lifting suction device (11). Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß ein mit dem am Hubsauger (11) aufgenommenen Mittel zur Signalerzeugung (16, 17) jeweils zusammenarbeitendes Mittel zur Signalerzeugung (17, 18) stationär gelagert ist.Device according to claim 1,
characterized,
that a means for signal generation (17, 18) which cooperates with the means for signal generation (16, 17) received on the lifting suction device (11) is stationary. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Signalerzeugung zwischen den Mitteln zur Signalerzeugung (16, 17) berührungslos erfolgt.Device according to claim 1,
characterized,
that the signal generation between the means for signal generation (16, 17) takes place without contact. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß das am Hubsauger (11) aufgenommene Mittel zur Signalerzeugung (16, 17) oberhalb einer Saugerfläche (12) positioniert ist.Device according to claim 1,
characterized,
that the means for signal generation (16, 17) received on the lifting suction device (11) is positioned above a suction surface (12). Vorrichtung gemäß Anspruch 4,
dadurch gekennzeichnet,
daß sich das am Hubsauger aufgenommene Mittel zur Signalerzeugung (17) ringförmig um die Symmetrieachse des Hubsaugers (11) erstreckt.Device according to claim 4,
characterized,
that the means for signal generation (17) received on the lifting suction device extends in a ring around the axis of symmetry of the lifting suction device (11). Vorrichtung gemäß Anspruch 4,
dadurch gekennzeichnet,
daß das am Hubsauger (11) aufgenommen Mittel zur Signalerzeugung (17) ein oder mehrere lokal begrenzte Flächen aufweist.Device according to claim 4,
characterized,
that the means for signal generation (17) received on the lifting suction device (11) has one or more locally limited areas. Vorrichtung gemäß Anspruch 2,
dadurch gekennzeichnet,
daß das stationär gelagerte Mittel zur Signalerzeugung (16) stiftförmig bis an den Hubsauger (11) heranragt.Device according to claim 2,
characterized,
that the stationary means for signal generation (16) protrudes like a pin to the lifting suction device (11). Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß das Mittel zur Signalerzeugung (17) als Magnet ausgeführt ist.Device according to claim 1,
characterized,
that the means for signal generation (17) is designed as a magnet. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Mittel zur Signalerzeugung (16, 17) induktiv arbeiten.Device according to claim 1,
characterized,
that the means for signal generation (16, 17) work inductively. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Mittel zur Signalerzeugung (16, 17) mindestens optoelektrische Bauteile umfassen.Device according to claim 1,
characterized,
that the means for signal generation (16, 17) comprise at least optoelectric components. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Mittel zur Signalerzeugung (16, 17) nach dem kapazitiven Prinzip arbeitende Sensoriken umfassen.Device according to claim 1,
characterized,
that the means for signal generation (16, 17) comprise sensors working according to the capacitive principle. Vorrichtung gemäß Anspruch 1,
dadurch gekennzeichnet,
daß die Mittel zur Signalerzeugung (16, 17) mit Ultraschall arbeiten.Device according to claim 1,
characterized,
that the means for signal generation (16, 17) work with ultrasound.
EP95105720A 1994-05-07 1995-04-18 Device for signal generation at a suction head Withdrawn EP0680905A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4416287 1994-05-07
DE19944416287 DE4416287A1 (en) 1994-05-07 1994-05-07 Device for generating signals on a suction head

Publications (1)

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DE (1) DE4416287A1 (en)

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DE10356107B4 (en) * 2003-11-27 2021-05-27 Mabeg Systems Gmbh Sheet feeder with leading edge separation and contactless stack scanning
DE102007003001A1 (en) * 2007-01-20 2008-07-24 Man Roland Druckmaschinen Ag Sheetfed
DE102007005403A1 (en) * 2007-02-03 2008-08-07 Man Roland Druckmaschinen Ag Sheet-separating suction device for feeder of sheet printing press, has drive device including stroke length adjusting device for fixing suction position by adjustment of length of stroke of cup along vertical running path
DE102015202454A1 (en) 2014-02-11 2015-08-13 Koenig & Bauer Aktiengesellschaft Sheet separator with at least one boom detection unit and method on a sheet-processing machine
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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EP0453810A2 (en) * 1990-04-21 1991-10-30 Heidelberger Druckmaschinen Aktiengesellschaft Device for locking the suction nozzle of suction separators at the suction head of a sheet feeder

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DE2318443A1 (en) * 1972-05-05 1973-11-22 Polygraph Leipzig PROCEDURES AND DEVICES FOR THE SINGLEIZATION AND CONTROL OF ARCHES
US3966197A (en) * 1973-11-19 1976-06-29 Veb Polygraph Leipzig Kombinat Fur Polygraphische Maschinen Und Ausrustungen Method and apparatus for controlled feeding of sheets to printing machines or the like
DE2606848A1 (en) * 1976-02-20 1977-09-01 Jochen H Dipl Ing Gelbke Positioner for single sheets of paper - has sheet feeler positioned at side edge of rear edge of sheet stack to monitor approach of sheets
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DE4009175C2 (en) * 1990-03-22 1998-05-20 Georg Binnen Lifting nozzle and button storage for sheet feeders
JP2802807B2 (en) * 1990-03-26 1998-09-24 キヤノン株式会社 Film remaining detection mechanism

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JPH07300255A (en) 1995-11-14

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