EP0317655B1 - Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen - Google Patents

Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen Download PDF

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Publication number
EP0317655B1
EP0317655B1 EP87117256A EP87117256A EP0317655B1 EP 0317655 B1 EP0317655 B1 EP 0317655B1 EP 87117256 A EP87117256 A EP 87117256A EP 87117256 A EP87117256 A EP 87117256A EP 0317655 B1 EP0317655 B1 EP 0317655B1
Authority
EP
European Patent Office
Prior art keywords
paper
recesses
sheet
guide plate
insertion guide
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
EP87117256A
Other languages
English (en)
French (fr)
Other versions
EP0317655A1 (de
Inventor
Akehiro C/O Sekiyado Works Kusaka
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.)
Komori Corp
Original Assignee
Komori Corp
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 Komori Corp filed Critical Komori Corp
Priority to EP87117256A priority Critical patent/EP0317655B1/de
Priority to AT87117256T priority patent/ATE62889T1/de
Priority to DE8787117256T priority patent/DE3769656D1/de
Priority to US07/125,484 priority patent/US4805893A/en
Publication of EP0317655A1 publication Critical patent/EP0317655A1/de
Application granted granted Critical
Publication of EP0317655B1 publication Critical patent/EP0317655B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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
    • B65H7/06—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 responsive to presence of faulty articles or incorrect separation or feed
    • 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
    • B65H7/14—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 by photoelectric 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
    • B65H2511/50—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
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/50—Occurence
    • B65H2511/52—Defective operating conditions
    • 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
    • B65H2511/52—Defective operating conditions
    • B65H2511/522—Folds or misfolding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/50—Timing
    • B65H2513/512—Starting; Stopping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/60—Optical characteristics, e.g. colour, light
    • 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
    • B65H2553/41—Photoelectric detectors
    • B65H2553/414—Photoelectric detectors involving receptor receiving light reflected by a reflecting surface and emitted by a separate emitter

Definitions

  • the invention relates to printing machines and more particularly to an abnormal-paper sensing apparatus in a printing machine, which apparatus includes an insertion guide plate for receiving and inserting a sheet of paper into a printing unit and associated at its front end with front lays for adjusting the position of the sheet of papers, and at least one sensor for sensing the presence of a front folded corner of a sheet of printing paper which hits against said front lays and stops, following the absence of reflected light due to the folded corner.
  • sheets of printing paper stacked on a stacker of a paper feeder are drawn and fed one by one by a sucker, starting with the top sheet, to a feeder board and then delivered onto the insertion guide plate with the aid of a carrier tape and feed rolls.
  • the sheet of paper then hits against the front lays and stops thereat with it being adjusted with reference to the vertical by the front lays and also with respect to right and left by a transverse needle device.
  • the sheet of paper which has hit against the lays and stopped is then captured and carried by a pawl of a swing device and then is printed while it is being carried with it being substitutively captured by a thicker pawl.
  • Sheets of paper are required to be fed one by one to the printing machine without being bent or folded. Therefore, when undesirable feeding, such as feeding of a sheet of paper having a folded corner or double-sheet feeding, has occurred, this fact is sensed and the capture by the pawls and the paper-feeding onto the insertion guide plate are stopped. An abnormal sheet of paper of this type is folded at its front right and/or left corner into a triangle.
  • the insertion guide plate itself will reflect light which is projected to its exposed portions. Therefore, the sensor is likely to determine erroneously that there is no corner folding and the paper feeding will be continued although, actually, there is a folded corner.
  • tests have been carried out by providing through holes in the insertion guide plate so as to cause the projected light to pass through the holes without reflecting the projected light when there is a corresponding corner folding.
  • the holes must have the form of elongated ones or of slots, so that a sheet of paper sliding on the insertion guide plate may be hooked at its corner into the elongated hole and bent to operate the sensor thereby, thus stopping feeding of the sheet of paper.
  • the provision of such an elongated hole would weaken the strength of the end portion of the insertion guide plate.
  • the insertion guide plate has recesses, which may preferably be arranged pairwise therein, defining sensing points at positions in the guide plate surface where such recesses can face transverse edges of the sheet of paper which passes over the recesses, each of the recesses having a cross-section
  • the slanted bottom of the recess When a sheet of paper fed correctly onto the insertion guide plate hits against the front lays and stops thereat, the sensor receives light emitted by the sensor itself and reflected by the sheet of paper, so that normal paper feeding continues.
  • the light projected by the sensor reaches the exposed slanted bottom of the recess and is reflected diffusively due to such slanted shape of the exposed bottom. Thus the sensor does not receive the reflected light. As a result, a signal is generated to stop the paper feeding.
  • FIG. 1 shows a plan view of the left half of an insertion guide plate
  • Fig. 2 shows an enlarged plan view of such portion of the insertion guide plate which includes a recess
  • Fig. 3 shows a cross-section view taken along line A-A of Fig. 2
  • Fig. 4 shows a cross-section of a sensor including the vicinity thereof.
  • an abnormal-paper sensing apparatus As shown in Figs. 1 to 4, an abnormal-paper sensing apparatus according to this invention and appropriate for being used in a not shown printing machine includes an elongated strip-like insertion guide plate or feedboard 1 which extends across the feeding direction of such printing machine. As becomes apparent from Fig. 4, the feedboard 1 is also supported to slant slightly between a paper feeder (not shown) and a printing unit (not shown).
  • a plurality of leaf springs 2 are disposed parallel to each other across the machine and supported by stays 4 above the front end of the feedboard 1 by means of brackets 3. The front ends of the leaf springs 2 abut slidably onto an upper surface of the front end of the feedboard 1.
  • a plurality of front lays 5 are supported in parallel with each other across the printing machine by a shaft 6 supported above the front end of the feedboard 1.
  • the front lays 5 are received in corresponding grooves 1a provided at the front end of the feedboard 1 whereby a reciprocating rotation of the shaft 6 through a predetermined angle at a predetermined timing causes the front lays to fall and rise vertically relative to the feedboard 1 so that they are withdrawn therefrom, as shown.
  • a sheet of paper 7 fed onto the feedboard 1 through a feeder board (not shown) from a paper feeder (not shown) is decelerated by the leaf springs 2 and hits against the front lays 2 to stop.
  • a pair of right and left recesses 8 are provided between right and left grooves 1a several millimeters 6 upstream of the front end of the feedboard 1.
  • Each recess 8 has the form of a rectangle extending across the feedboard 1 and also a right-angled triangle in cross section having a longer side 8a positioned on the side of the front end of the feedboard 1 and a shorter side 8b positioned on the side of the rear end of the feedboard 1.
  • the inner surface of each recess 8 is coated with a black material.
  • These recesses 8 are positioned and sized such that the end edge of a sheet of printing paper having any width between the maximum and minimum ones may pass over those recesses.
  • Reference numeral 7 denotes a dash-dotted line showing one of several standard sizes of paper.
  • a pair of brackets 11 are split-tightened in correspondence to the recesses 8 onto the stays 10 supported above the front end of the feedboard 1.
  • Each bracket 11 has a reflection type sensor 12 fixed thereto through a holder 13 opposite to the corresponding recess 8.
  • the sensor 12 is of the type which emits light and receives the light reflected by an object. In this embodiment, when the sensor receives no reflected light, it generates a signal which is delivered via a lead 14 to a controller (not shown) thereby to stop the paper feeding. In other words, when a sheet of paper 7 covers the recesses 8, light will be reflected, so that no signal is generated.
  • the arrangement is such that when a sheet of paper 7 is folded at one of its front corners, the corresponding recess 8 is exposed, so that the projected light is reflected diffusively by the bottom surface of the recess 8. Thus, the diffused light is not received by the sensor 12, so that the sensor 12 generates a signal.
  • each recess 8 has a slanted inner surface asymmetrical with regard to a transverse plane therein and coated with a black material, so that the light projected from the sensors 12 is reflected diffusively by the bottom surface of the recess. Therefore, the reflected light does not arrive at the sensors 12, so that the sensors 12 produce a signal to stop the paper feeding. Thus the abnormal-sheet of paper with the folded corner is removed and printing is then resumed.
  • the insertion guide plate has a pair of recesses provided in a front end portion thereof so as to extend thereacross at positions where the recesses can face front corners of the sheet of paper which passes over the recesses, the recesses each having a triangular cross section with a longer side positioned on the side of the front end of the insertion guide plate and with a shorter side positioned on the side of the rear end of the insertion guide plate.
  • the front-side portion of the recess bottom is gently inclined, so that a corner of a normal sheet of paper is not hooked, thereby reducing the quantity of wasted paper.
  • the recesses do not extend through the insertion guide plate, so that it has a strength greater than the conventional one. If the recess bottom is coated with a black material, sensing will be improved even further.

Landscapes

  • Controlling Sheets Or Webs (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (7)

  1. Einrichtung zum Abfühlen abnormen Papiers in einer Druckmaschine, wobei die Einrichtung eine dem Aufnehmen und Einführen eines Papierblattes (7) in eine Druckeinheit dienende Einführ-Führungsplatte (1), die an ihrem Vorderende Frontanschlägen (5) zum Ausrichten der Lage des Papierblattes zugeordnet ist, und wenigstens einen Sensor (12) zum Abfühlen des Vorhandenseins einer vorderen gefalteten Ecke eines gegen die Frontanschläge (5) anschlagenden und anhaltenden Papierblattes (7) aufgrund des Fehlens von reflektiertem Licht infolge der gefalteten Ecke umfaßt, dadurch gekennzeichnet, daß die Einführ-Führungsplatte Ausnehmungen (8) hat, die Abfühlpunkte an Positionen in der Führungsplatten-Oberfläche definieren, an denen solche Ausnehmungen Querrändern des Papierblattes gegenüberliegen können, das über die Ausnehmungen hinwegläuft, wobei jede der Ausnehmungen einen solchen Querschnitt hat, daß der Sensor kein reflektiertes Licht abfühlt, wenn das Blatt sich in einem abnormen Zustand befindet und damit an einem Abfühlpunkt nicht vorhanden ist.
  2. Einrichtung nach Anspruch 1, gekennzeichnet durch,
    ein Paar Ausnehmungen (8), die entlang derjenigen Seite der Einführ-Führungsplatte angeordnet sind, die den Frontanschlägen benachbart ist, derart, daß die Ausnehmungen den entsprechenden Ecken des Blattes gegenüberliegen können, das darüber hinwegläuft, wobei die Ausnehmungen eine Struktur zur Erzeugung einer Diffus-Reflexion aufweisen;
    ein Paar Sensoren (12) zum Projizieren von Licht gegen die Ausnehmungen und zum Empfangen von durch die Ausnehmungen reflektiertem Licht;
    wobei die Anordnung so getroffen ist, daß, wenn ein Papierblatt mit einer vorderen gefalteten Ecke über die Ausnehmungen hinwegläuft, das von den Sensoren projizierte Licht von der Ausnehmung diffus reflektiert und von den Sensoren nicht empfangen wird, wodurch die Papierzuführung abgestoppt wird.
  3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Querschnitt der Ausnehmungen (8) eine Form hat, die eine längere Seite (8a), auf der Seite des Vorderendes der genannten Einführ-Führungsplatte (1) aufrecht, und eine kürzere Seite (8b), gegen das rückwärtige Ende der Einführ-Führungsplatte hin angeordnet, aufweist.
  4. Einrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jede Ausnehmung (8) einen dreieckförmigen Querschnitt hat.
  5. Einrichtung nach Anspruch 4, dadurch gekennzeichnet, daß der dreieckförmige Querschnitt rechtwinklig ist.
  6. Einrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die innere Oberfläche der Ausnehmungen (8) mit einem schwarzen Material zum Absorbieren von Licht, das darauf empfangen wird, überzogen ist.
  7. Einrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Ausnehmungen (8) in Quererstreckung eine Länge haben, die ausreicht, um das Abfühlen eines abnormen Papierblattes zu erlauben, das eine Breite eines vorbestimmten Bereichs aufweist.
EP87117256A 1987-11-24 1987-11-24 Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen Expired - Lifetime EP0317655B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP87117256A EP0317655B1 (de) 1987-11-24 1987-11-24 Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen
AT87117256T ATE62889T1 (de) 1987-11-24 1987-11-24 Vorrichtung zum detektieren von fehlerhaften boegen in druckmaschinen.
DE8787117256T DE3769656D1 (de) 1987-11-24 1987-11-24 Vorrichtung zum detektieren von fehlerhaften boegen in druckmaschinen.
US07/125,484 US4805893A (en) 1987-11-24 1987-11-25 Abnormal-paper sensing apparatus in a printing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87117256A EP0317655B1 (de) 1987-11-24 1987-11-24 Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen

Publications (2)

Publication Number Publication Date
EP0317655A1 EP0317655A1 (de) 1989-05-31
EP0317655B1 true EP0317655B1 (de) 1991-04-24

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EP87117256A Expired - Lifetime EP0317655B1 (de) 1987-11-24 1987-11-24 Vorrichtung zum Detektieren von fehlerhaften Bögen in Druckmaschinen

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EP (1) EP0317655B1 (de)
AT (1) ATE62889T1 (de)
DE (1) DE3769656D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1428779A1 (de) * 2002-12-13 2004-06-16 Kba-Giori S.A. Vorrichtung und Verfahren zur Integritätskontrolle von flachen Gegenstände
EP2489514B1 (de) 2011-02-16 2016-02-03 Komori Corporation Verfahren und Vorrichtung zum Erkennen einer gefalteten Bogenecke in einer Bogendruckmaschine
EP2808279A4 (de) * 2012-01-25 2015-10-07 Fujitsu Frontech Ltd Mediennachweisvorrichtung und medienförderungsvorrichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480546A (en) * 1980-12-05 1984-11-06 Komori Printing Machinery Co., Inc. Apparatus for detecting defects of printing sheets using adjustable length rotatable sector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3647205A (en) * 1970-05-15 1972-03-07 Polygraph Leipzig Method and apparatus for feeding of sheets fittingly aligned to a machine
SE360839B (de) * 1971-10-05 1973-10-08 Printing Equipment Ab
DE3336721C2 (de) * 1983-10-08 1986-12-11 Erhardt & Leimer GmbH, 8900 Augsburg Photoelektrische Fühlvorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480546A (en) * 1980-12-05 1984-11-06 Komori Printing Machinery Co., Inc. Apparatus for detecting defects of printing sheets using adjustable length rotatable sector

Also Published As

Publication number Publication date
EP0317655A1 (de) 1989-05-31
DE3769656D1 (de) 1991-05-29
ATE62889T1 (de) 1991-05-15

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