DE2913410A1 - Photoelectric measurement of printer paper edge position - uses rows of optical fibres with individual opto-electrical transducers - Google Patents

Photoelectric measurement of printer paper edge position - uses rows of optical fibres with individual opto-electrical transducers

Info

Publication number
DE2913410A1
DE2913410A1 DE19792913410 DE2913410A DE2913410A1 DE 2913410 A1 DE2913410 A1 DE 2913410A1 DE 19792913410 DE19792913410 DE 19792913410 DE 2913410 A DE2913410 A DE 2913410A DE 2913410 A1 DE2913410 A1 DE 2913410A1
Authority
DE
Germany
Prior art keywords
optical fiber
sheet
measuring device
optical fibers
light
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.)
Granted
Application number
DE19792913410
Other languages
German (de)
Other versions
DE2913410C2 (en
Inventor
Siegfried Alfons Stark
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer 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 Koenig and Bauer AG filed Critical Koenig and Bauer AG
Priority to DE2913410A priority Critical patent/DE2913410C2/en
Priority to IT20942/80A priority patent/IT1131077B/en
Publication of DE2913410A1 publication Critical patent/DE2913410A1/en
Application granted granted Critical
Publication of DE2913410C2 publication Critical patent/DE2913410C2/en
Expired legal-status Critical Current

Links

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
    • B65H7/14—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
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/342—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells the sensed object being the obturating part

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

The photoelectric measurement appts. determines the posn of the edge of a sheet of paper on a rotary print machine surface, e.g. a feeder plate (1). It measures to an accuracy of 0.01 millimetres or better and produces a digitally evaluated measurement increment without needing an analogue to digital convertor. The flat ends (7) of a row of light conducting fibres (5) are directed at the edge of the paper via a hole (2) in the plate. The light (9) from a source (8) passes along unobscured fibres to individual fibre analysis units (10) producing corresp. electrical signals. The analyser signals can be fed to a counter or similar circuit. Two rows of fibres may be used at the measurement plane (7) in which case sensitivity can be doubled by staggering them by half a circular fibre end dia.

Description

Lichtelektrische MesseinrichtungPhotoelectric measuring device

Die Erfindung betrifft eine lichtelektrische Messeinrichtung zur wertmaessigen Erfassunq einer Lage einer Kante eines Bogens auf einer Flaeche einer Bogenrotationsdruckmaschine.The invention relates to a photoelectric measuring device for measuring the value Detection of a position of an edge of a sheet on a surface of a sheet-fed rotary printing press.

Derartige Finrichtunqen sind z. Bo durch die DE-OS 26 59 469 bekannt geworden.Such Finrichtunqen are z. Bo from DE-OS 26 59 469 known become.

Der Erfindung liegt die Aufgabe zugrunde, eine Messeinrichtung zur wertmaessigen Erfassung der Lage einer Kapte eines Bogens auf einem Gegenstand, z. B. eines Anlegebleches, einer Bogenrotationsdruckmaschine zu schaffen hierbei soll eine Messung der Laqe der Boqenkansce auf mindestens 0,01 n genau moeglich sein, und ausserdem soll jedes Messinkrement fuer sich digital auswertbar sein Die mit der Erfindung erzielbaren Vorteile bestenen insbesondere darin, dass jedes Messinkrement fuer sich allein digital auswertbar ist. Hierdurch ist eine einfache und genaue Messung und Auswertung der Lage des Bogens auf z. B. einem Anlegetisch moeglich. Ferner sind Umformeinrichtungen nicht notwendig, um einen digitalen Messwert aus einem analogen zu erhalten.The invention is based on the object of a measuring device for Valuable recording of the position of a cape of a bow on an object, z. B. to create a contact plate, a sheet-fed rotary printing press here a measurement of the length of the Boqenkansce should be possible to an accuracy of at least 0.01 n be, and in addition, each measurement increment should be digitally evaluable for itself The advantages that can be achieved with the invention are in particular that each measurement increment can be evaluated digitally on its own. This makes it easy and accurate Measurement and evaluation of the position of the sheet on z. B. a feed table possible. Furthermore, conversion devices are not necessary in order to generate a digital measured value to get an analog.

Pin Ausfuehrungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden naeher beschrieben. Es zeigen Fig. 1 ein Anlegeblech einer Bogenrotationsdruckmaschine mit er erfindungsgemaessen Einrichtung, Fig. 2 einen Schnitt SI-TI durch iq, 1.Pin exemplary embodiment of the invention is shown in the drawing and is described in more detail below. 1 shows a contact plate of a Sheet-fed rotary printing machine with a device according to the invention, FIG. 2 a Section SI-TI through iq, 1.

In einerr Anleqeblech 1 ist ein rechteckiger Ausbruch 2 von ca 30 r.m Laenge und 5 mm Breite sauer zur Bogenlaufrichtunq ausgestanzt. Dieser Ausbruch 2 dient zur Aufnahme einer Messeinrichtung 3, welche zur Messung der Seitenkantenlage eines (nicht dargestellten) Bogens auf dem Anlegeblech 1 dient Messeinrichtufng 3 besteht aus einer Vielzahl von mindestens in einer Reihe dicht an dicht liegenden Lichtleitfasern 5. Diese Lichtleitfasern 5 sind in eine Kunststoffmasse 6 eingegossen und kennen so bequem am Anlegblech 1 verschraubt werden, dass sie in den Ausbruch 2 hineinragen Die Stirnflaechen 7 der Lichtleitfasern 5 koennen gemeinsam ueberschliffen werden, so dass sie eine vollkommen plane rlaeche bilden. Oberhalb in einem Abstand a von ca. 50 mm der Stirnflaechen 7 der Lichltleie fasern 5 ist ein Lichtgeher 8 angebracht.In a lay-on plate 1 there is a rectangular cutout 2 of approx. 30 r.m length and 5 mm width punched out acidic to the sheet running direction. This outbreak 2 is used to accommodate a measuring device 3, which is used to measure the side edge position a (not shown) sheet on the contact plate 1 is used Messeinrichtufng 3 consists of a large number of at least one row close together Optical fibers 5. These optical fibers 5 are cast in a plastic compound 6 and know that they can be screwed to the support plate 1 so easily that they can be screwed into the breakout 2 protrude The end faces 7 of the optical fibers 5 can be ground together so that they form a perfectly flat surface. Above at a distance a of approx. 50 mm of the end faces 7 of the Lichltleie fibers 5 is a light walker 8 appropriate.

Vom Lichtgeber 8 tritt z. B. monochromatisches Licht 9 aus und trifft auf die Stirnflaechen 7 der Lichtleitfasern 5.From the light transmitter 8 occurs z. B. monochromatic light 9 and hits onto the end faces 7 of the optical fibers 5.

Von diesen wird das Licht 9 aufgenommen und ueber Lichtleitfasern 5 auf Auswerteinheiten 10 geleitet. Jede Lichtleitfaser 5 endet in einer Auswerteinheit 10. Diese kann z. B.The light 9 is received by these and via optical fibers 5 routed to evaluation units 10. Each optical fiber 5 ends in an evaluation unit 10. This can z. B.

aus einer Fotodiode mit angekoppeltem Verstaerker bestehen.consist of a photodiode with a coupled amplifier.

Der Verstaerker kann mit einer ASppstufe versehen sein so dass je nachdem ob Licht 9 auf die Stirnflaeche 7 einer Lichtleitfaser 5 auftrifft oder nicht, am Verstaerkerausqanq ein L- oder Null-Signal ansteht. Dieses Signal ann dann einzeln oder in Verbindung mit einer Zaehlschaltung ausqewertet werden Die Lichtleitfaserdurchmesser d werden zweckaessig entsprechend den qewuenschten Messinkrementen geweehlt.The amplifier can be provided with an A-stage so that each after whether light 9 strikes the end face 7 of an optical fiber 5 or not, there is an L or zero signal at the amplifier output. This signal ann can then be evaluated individually or in conjunction with a counter circuit Optical fiber diameters d are expediently according to the desired measuring increments chosen.

So wird man zweckmaessigerweise bei einem qewuenschten Messwertinkrement von 0,01 mm eine Lichtleitfaser waehlen, deren Durchmesser 0,01 mm betraeqt.This is how one becomes expediently with a desired measured value increment of 0.01 mm choose an optical fiber with a diameter of 0.01 mm.

/ Teileliste Teilel iste 1 Anleqeblech 2 Ausbruch 3 Messeinrichtung 4 5 Lichtleitfaser 6 Kunststoffmasse 7 Stirnflaechen B Lichtgeber 9 Licht 10 Auswerteinheit 11 12 13 14 15 16 17 18 19 20 a Abstand d Lichtleitfaserdurchmesser / Patentansprueche L e e r s e i t e / Parts list Part is 1 support plate 2 cut-out 3 Measuring device 4 5 Optical fiber 6 Plastic compound 7 Front surfaces B Light transmitter 9 Light 10 Evaluation unit 11 12 13 14 15 16 17 18 19 20 a Distance d Optical fiber diameter / Claims L e r s e i t e

Claims (5)

P a t e n t a n s p r u e c h e 1. Lichtleitelektrische Messeinrichtung zur wertmaessigen Erfassung einer Lage einer Kante eines Bogens auf einer Flache einer Bogenrotationsdruckmaschine, dadurch gekennzeichnet, dass mindestens eine Reihe einer mehrzahl dicht an dicht, auf die zu messende flogenkante bezogen, hintereinanderliegender, mindestens 0,n1 mm dicker Lichtleitfasern (5) angeordnet ist, dass die freien, planen Stirnflaechen (7) der Lichtleitfasern (5) dem Bogen und einem Lichtgeber (8) zugewandt sind, dass jeweils jedes der Stirnflaechen (7) entgegengesetzte Ende jeder Lichtleitfaser (5) lichtleitend mit einer Auswerteinheit (1<)) verbunden ist, dass jede Nuswerteinheit (1n) ein Lichtsignal in ein entsprechendes elektrisches Signal umwandelt, das einer Zaehlschaltung oder Rehnlichem zuqeffiehrt wird. P a t e n t a n s p r u e c h e 1. Optical fiber measuring device for the value acquisition of a position of an edge of a sheet on a surface a sheet-fed rotary printing press, characterized in that at least one Row of a plurality close together, related to the edge of the fly to be measured, one behind the other, At least 0.1 mm thick optical fibers (5) are arranged so that the free, planar ones End faces (7) of the optical fibers (5) facing the sheet and a light transmitter (8) are that each of the end faces (7) opposite end of each optical fiber (5) light-conducting with an evaluation unit (1 <)) is connected that each Nuswerteinheit (1n) converts a light signal into a corresponding electrical signal that a Counting circuit or similar is assigned. 2. Lichtleitelektrische Messeinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass zwei Reihen hintereinanderliegender Lichtleitfasern (5) angeordnet sind, dass die beiden Reihen entsprechend Fig. 2 um einen halben Lichtleitfaserdurchmesser (d/2) zueinander versetzt anqeordnet sind. 2. Optical fiber measuring device according to claim 1, characterized characterized in that two rows of optical fibers (5) lying one behind the other are arranged are that the two rows according to FIG. 2 by half an optical fiber diameter (d / 2) are arranged offset to one another. 3. Lichtleitelektrische Messeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Lichtleitfasern (5) kreisrunden Querschnitt aufweisen. 3. Optical fiber measuring device according to claim 1 or 2, characterized characterized in that the optical fibers (5) have a circular cross-section. 4. Lichtleitelektrische Messeinrichtung nach Anspruch 1 his 3, dadurch gekennzeichnet, dass der Lichtgeber (8) in einem Nhstand (a) von den planen, freien Stirnflaechen (7) der Lichtleitfasern (5) angeordnet ist. 4. Optical fiber measuring device according to claim 1 to 3, characterized characterized in that the light transmitter (8) in a proximity (a) from the plan, free Front surfaces (7) of the optical fibers (5) is arranged. 5. Lichtleitelektrische Messeinrichtunq, nach den Anspruechen 1 bis 4, dadurch gekennzeichnet, dass die Enden der Lichtleitfasern (5) mittels Kunststoff (6) miteinander verklebt sind und unterhalb eines Anlegebleches (1) einer Boqenrotationsdruckmaschine angeordnet sind.5. Optical fiber measuring device according to claims 1 to 4, characterized in that the ends of the optical fibers (5) by means of plastic (6) are glued together and underneath a mounting plate (1) of a sheet rotary printing machine are arranged.
DE2913410A 1979-04-04 1979-04-04 Photoelectric measuring device Expired DE2913410C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2913410A DE2913410C2 (en) 1979-04-04 1979-04-04 Photoelectric measuring device
IT20942/80A IT1131077B (en) 1979-04-04 1980-03-27 PHOTOELECTRIC MEASUREMENT DEVICE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2913410A DE2913410C2 (en) 1979-04-04 1979-04-04 Photoelectric measuring device

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Publication Number Publication Date
DE2913410A1 true DE2913410A1 (en) 1980-10-16
DE2913410C2 DE2913410C2 (en) 1983-08-04

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IT (1) IT1131077B (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232490A1 (en) * 1981-09-04 1983-03-31 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Device for determining and evaluating ink measuring fields on a printed sheet
EP0114914A1 (en) * 1983-01-29 1984-08-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Device for detecting and evaluating colour control strips on a printing sheet
DE3411886A1 (en) * 1983-03-31 1984-10-11 Bobst S.A., Lausanne DEVICE FOR FEEDING BOWS STRATIFIED INTO A STACK TO ANOTHER MACHINE
US4518862A (en) * 1981-09-04 1985-05-21 M.A.N.-Roland Druckmaschinen Aktiengesellschaft System for detecting the position of a sheet on its support
EP0143188A1 (en) * 1983-11-28 1985-06-05 Kabushiki Kaisha Toshiba Method of and device for detecting displacement of paper sheets
EP0184145A2 (en) * 1984-12-04 1986-06-11 Koenig & Bauer Aktiengesellschaft Measuring head
EP0224240A2 (en) * 1985-11-26 1987-06-03 Bernd Becker Apparatus for the control of an installation for the manufacturing of extruded sections
DE3644431A1 (en) * 1986-12-24 1988-09-01 Koenig & Bauer Ag ARCH GRIPPER DEVICE IN A ROTARY PRINTING MACHINE WITH ARC GRIPPERS THAT ARE MOVABLE IN THE AXIAL DIRECTION
EP0533043A1 (en) * 1991-09-14 1993-03-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines
WO1996013454A1 (en) * 1994-10-26 1996-05-09 Minnesota Mining And Manufacturing Company Electro-optic sheet-sensing apparatus and method
EP0742171A2 (en) * 1995-05-08 1996-11-13 Bobst S.A. Photoelectric sensor for a register control device in a rotary printing machine
EP0753407A2 (en) † 1995-07-08 1997-01-15 Heidelberger Druckmaschinen Aktiengesellschaft Side register device for sheets in a sheet feeder of a rotary printing machine
CN111532824A (en) * 2020-05-07 2020-08-14 杭州庚复科技有限公司 Automatic printer correction paper feeding device based on light sensation control principle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3825295C2 (en) * 1988-07-26 1994-05-11 Heidelberger Druckmasch Ag Device for detecting the position of a paper edge
DE102010064066A1 (en) * 2010-12-23 2012-06-28 Manroland Ag Light scanner for sampling forward edges in sheet aligned in sheet feeder of sheet processing machine i.e. printing machine, has sensors including measuring segments that are rearwardly arranged in sheet traveling direction

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911769U (en) * 1962-07-30 1965-03-11 Siemens Ag PHOTOELECTRIC SCANNING DEVICE FOR PUNCH CARDS OD. DGL.
DE2202087A1 (en) * 1971-02-26 1972-09-07 Polygraph Leipzig Photoelectric measuring device on sheet-forming and sheet-processing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911769U (en) * 1962-07-30 1965-03-11 Siemens Ag PHOTOELECTRIC SCANNING DEVICE FOR PUNCH CARDS OD. DGL.
DE2202087A1 (en) * 1971-02-26 1972-09-07 Polygraph Leipzig Photoelectric measuring device on sheet-forming and sheet-processing machines

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3232490A1 (en) * 1981-09-04 1983-03-31 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Device for determining and evaluating ink measuring fields on a printed sheet
US4518862A (en) * 1981-09-04 1985-05-21 M.A.N.-Roland Druckmaschinen Aktiengesellschaft System for detecting the position of a sheet on its support
EP0114914A1 (en) * 1983-01-29 1984-08-08 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Device for detecting and evaluating colour control strips on a printing sheet
US4648048A (en) * 1983-01-29 1987-03-03 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Apparatus for determining and evaluating color measurement strips on a printed sheet
DE3411886A1 (en) * 1983-03-31 1984-10-11 Bobst S.A., Lausanne DEVICE FOR FEEDING BOWS STRATIFIED INTO A STACK TO ANOTHER MACHINE
EP0143188A1 (en) * 1983-11-28 1985-06-05 Kabushiki Kaisha Toshiba Method of and device for detecting displacement of paper sheets
US4630813A (en) * 1983-11-28 1986-12-23 Kabushiki Kaisha Toshiba Method of and device for detecting displacement of paper sheets
EP0184145A2 (en) * 1984-12-04 1986-06-11 Koenig & Bauer Aktiengesellschaft Measuring head
EP0184145A3 (en) * 1984-12-04 1987-02-04 Koenig & Bauer Aktiengesellschaft Measuring head
EP0224240A3 (en) * 1985-11-26 1988-01-13 Bernd Becker Apparatus for the control of an installation for the manufacturing of extruded sections
EP0224240A2 (en) * 1985-11-26 1987-06-03 Bernd Becker Apparatus for the control of an installation for the manufacturing of extruded sections
DE3644431A1 (en) * 1986-12-24 1988-09-01 Koenig & Bauer Ag ARCH GRIPPER DEVICE IN A ROTARY PRINTING MACHINE WITH ARC GRIPPERS THAT ARE MOVABLE IN THE AXIAL DIRECTION
US4833989A (en) * 1986-12-24 1989-05-30 Koenig & Bauer Aktiengesellschaft Axially shiftable sheet gripper assembly
EP0533043A1 (en) * 1991-09-14 1993-03-24 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Arrangement for photoelectrically monitoring the movement of webs or sheets, in particular paper webs in rotary printing machines
US5395027A (en) * 1991-09-14 1995-03-07 Man Roland Druckmaschinen Ag Printing system having optical supervision apparatus of a substrate running web, particulary a paper web
WO1996013454A1 (en) * 1994-10-26 1996-05-09 Minnesota Mining And Manufacturing Company Electro-optic sheet-sensing apparatus and method
EP0742171A2 (en) * 1995-05-08 1996-11-13 Bobst S.A. Photoelectric sensor for a register control device in a rotary printing machine
EP0742171A3 (en) * 1995-05-08 1997-11-12 Bobst S.A. Photoelectric sensor for a register control device in a rotary printing machine
US5747795A (en) * 1995-05-08 1998-05-05 Bobst Sa Photoelectric detector for a register control device within a rotary printing machine
EP0753407A2 (en) † 1995-07-08 1997-01-15 Heidelberger Druckmaschinen Aktiengesellschaft Side register device for sheets in a sheet feeder of a rotary printing machine
EP0753407B2 (en) † 1995-07-08 2005-10-26 Heidelberger Druckmaschinen Aktiengesellschaft Side register device for sheets in a sheet feeder of a rotary printing machine
CN111532824A (en) * 2020-05-07 2020-08-14 杭州庚复科技有限公司 Automatic printer correction paper feeding device based on light sensation control principle

Also Published As

Publication number Publication date
DE2913410C2 (en) 1983-08-04
IT8020942A0 (en) 1980-03-27
IT1131077B (en) 1986-06-18

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