EP0432289A1 - Capteur optique pour matériaux réfléchissants ou nonréfléchissants - Google Patents

Capteur optique pour matériaux réfléchissants ou nonréfléchissants Download PDF

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Publication number
EP0432289A1
EP0432289A1 EP89122834A EP89122834A EP0432289A1 EP 0432289 A1 EP0432289 A1 EP 0432289A1 EP 89122834 A EP89122834 A EP 89122834A EP 89122834 A EP89122834 A EP 89122834A EP 0432289 A1 EP0432289 A1 EP 0432289A1
Authority
EP
European Patent Office
Prior art keywords
reflection
light barrier
reflection light
scanning
arrangement
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
EP89122834A
Other languages
German (de)
English (en)
Other versions
EP0432289B1 (fr
Inventor
Hans Winter
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Siemens AG
Wincor Nixdorf International GmbH
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 Siemens AG, Wincor Nixdorf International GmbH filed Critical Siemens AG
Priority to DE89122834T priority Critical patent/DE58905565D1/de
Priority to EP19890122834 priority patent/EP0432289B1/fr
Publication of EP0432289A1 publication Critical patent/EP0432289A1/fr
Application granted granted Critical
Publication of EP0432289B1 publication Critical patent/EP0432289B1/fr
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
    • B65H7/14—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
    • B65H2511/514—Particular portion of element
    • 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 an arrangement for scanning materials with different reflection behavior.
  • record carriers can e.g. consist of highly reflective white paper or a foil with a metallized surface or they consist of almost transparent foil.
  • FIG. 1 A conventional reflection light barrier for scanning reflective materials is shown in FIG. 1. It consists of a light-emitting diode LED and a photo transistor FT, the light-emitting diode and photo transistor being arranged on one side of a paper channel PK. On the other side of the paper channel PK there is a black light-absorbing surface AF. If there is no recording medium in the paper channel PK, the light that is emitted by the light-emitting diode LED is not reflected back by the black room AF on the opposite side. The phototransistor current in the phototransistor FT is small. If the reflective material RM (recording medium) is inserted into the paper channel PK as shown in FIG. 1, the light from the light-emitting diode LED is reflected on the reflective material and the photo transistor current in the photo transistor FT is large.
  • RM recording medium
  • a sensor according to FIG. 2 In order to be able to detect non-reflective material or non-reflective record carriers, a sensor according to FIG. 2 is used. This sensor has a reflective surface RF in the paper channel PK on one side opposite the reflection light barrier. If there is no material NM above the reflection light barrier, the light that the light-emitting diode LED emits is reflected back by the reflecting surface RF and detected by the phototransistor FT. The photo transistor current is large.
  • the photo transistor current in the photo transistor FT is small.
  • the aim of the invention is therefore to provide an arrangement with a reflection light barrier with which materials with different reflection behavior can be reliably detected.
  • Another object of the invention is to design the arrangement so that it is used in particular for monitoring the recording Munglytransport can be used in printing facilities.
  • an arrangement with a reflection light barrier can be constructed which is insensitive to the different reflection behavior of different materials.
  • a reflection surface is arranged in a guide channel for receiving the material to be detected in relation to the reflection light barrier at a reference distance.
  • the reflection distance is chosen so that the radiation area and sensitivity area of the light-emitting diode and the phototransistor overlap as much as possible on the reflection surface.
  • An assigned evaluation arrangement compares a reference signal obtained by reflection on the reflection surface at the reference distance with a material signal obtained by reflection on the material to be detected and generates a scanning signal therefrom.
  • the arrangement according to the invention is particularly suitable for monitoring the recording medium transport in printing devices in which recording media with different reflection behavior (high gloss, metallized, dark) are to be used.
  • the evaluation arrangement uses a scanning device to insert a recording medium into the printing device and, depending on the scanning behavior of the recording medium determined, optimizes the working range of the reflection light barrier using adjusting means.
  • the pre-adjustment of the entire arrangement becomes particularly simple if one provides an adjustment arrangement which interacts with a device emulating the installation location.
  • the device emulating the installation location contains means for receiving the reflection light barrier and a reflection surface arranged at the reference distance.
  • the reflection light barrier can be adjusted separately from the actual printing device by means of a balancing element (balancing resistance) assigned to the reflection light barrier.
  • a reflection light barrier shown in FIG. 3 contains a light-emitting diode LED and a photo transistor FT.
  • the light-emitting diode LED emits light when excited in a radiation area AB, which is determined by a predetermined solid angle. This light is reflected on a reflecting surface RF and the photo transistor FT receives the reflected light in a sensitivity range EB with a corresponding predetermined solid angle. If the distance A between the light barrier and the reflecting surface RF is changed while the light barrier is stationary, the course of a photo transistor current IF in the photo transistor FT shown in FIG. 6 results. If the distance is small, the radiation area AB and the sensitivity area EB are spaced apart, as shown in FIG.
  • the phototransistor current IF is correspondingly low. Cover radiation area AB and sensitivity area EB at a so-called reference distance RA corresponding to the figure 3, the optimal phototransistor current IF results. If the distance increases and a configuration as shown in FIG. 5 arises, the phototransistor current IF becomes smaller again because the sensitivity range and the radiation range of the light-emitting diode and the phototransistor overlap only partially. It is assumed that the light power received by the phototransistor causes a corresponding electrical output signal from the phototransistor. This can be the phototransistor current IF itself or an output voltage corresponding to this phototransistor current IF.
  • the arrangement described in FIG. 7 is used - as will be explained in more detail later - within an electrophotographic printing device for scanning the recording medium via its perforations at the edges.
  • the arrangement consists of a known reflection light barrier with light-emitting diode LED and photo transistor FT, which is covered by a glass pane S1.
  • the glass pane S1 forms a side surface of a guide channel, in this case a paper channel PK.
  • the other side wall of the paper channel PK is formed by a reflective surface RF, which is also covered by a glass pane S2.
  • Silk glass panes S1 and S2 define the clear width of the paper channel PK and thus the position of the record carrier M to be scanned and they also have a protective function.
  • the reflection light barrier is arranged in an installation plane EE, the reflecting surface RF at a distance RA to the installation plane EE, which is selected such that the emission range and sensitivity range of the light-emitting diode and phototransistor optimally overlap.
  • the upper curve represents the characteristic curve for a reflective material
  • the lower section curve shows the curve of the characteristic curve for a non-reflective material. If the reflecting surface RF is at the reference distance RA from the installation plane EE of the retro-reflective sensor, there is a phototransistor current IFR without a recording medium M, which is referred to below as a reference signal.
  • a phototransistor current IR which is lower than the phototransistor current IFR. If non-reflective material is introduced into the paper channel, for example dark matte paper, a phototransistor current IN results, which in turn is lower than the phototransistor current IR in the case of reflective material.
  • the measured phototransistor current is always compared, e.g. IR or IN when the record carrier is inserted with the reference phototransistor current IFR.
  • the ratio of reference phototransistor current IFR to phototransistor current IR is greater than one when the material is inserted, i.e. larger than an assumed threshold and can therefore be recognized. If there is non-reflective material in the paper channel PK, the signal ratio between the reference current IFR and the "signal current" increases with non-reflective material. This ratio is much greater than one and therefore this material can also be recognized.
  • Another parameter is the position of the paper channel PK and the position of the record carrier M determined by the paper channel. If the paper channel and thus the material M to be scanned are placed in the vicinity of the reflection surface RF, the Ver Ratio of reference phototransistor current IFR to the phototransistor currents in the case of reflecting and non-reflecting material IR and IN is smaller and thus the scanning becomes more difficult. Due to the large distance between the installation plane and the material M to be scanned, however, the scanning becomes less sensitive to displacements of the recording medium M, in particular when the edge perforation of the recording medium is used for the scanning.
  • the paper guide channel PK is arranged closer to the installation plane of the reflection light barrier.
  • a paper transport device for an electrophotographic printing device DR with a built-in reflection light barrier RL for different recording media M is shown in FIG. It contains a conventional tractor drive with a paper guide element B, on which an electric motor-driven tractor belt TB is guided.
  • the tractor belt TB engages with transport nipples N in the perforations on the edge of the recording medium M.
  • the tractor drive also has paper pressure flaps K which can be swiveled in the direction of the arrow and which serve to press the recording medium M against the tractor belt TB and thus to ensure reliable guidance of the recording medium M within the paper guide channel PK.
  • a detachable reflection light barrier RL which is covered by the glass pane S1 and has a light-emitting diode and phototransistor arranged therein, is releasably attached to a mounting plate B opposite the reflecting surface.
  • the reflection light barrier RL is attached to a printed circuit board L (FIG. 10) on which a trimming resistor R is arranged.
  • the circuit board L with the reflection light barrier arranged thereon and the balancing resistor R can be detachably fastened on the mounting plate B with the aid of screws in a defined position.
  • the glass panes also have a protective function, e.g. the glass pane S2 can also serve as a carrier element for the reflection surface RF.
  • the glass pane S2 may be vapor-coated with metal, this metal vaporization then forming the reflection surface.
  • the recording medium M moved through the paper channel PK cleans the surfaces of the glass panes S1 and S2 from attached paper dust and thus ensures the functionality of the entire arrangement.
  • the reflection light barrier RL is connected to an evaluation arrangement AA in accordance with FIG. 11.
  • This essentially consists of a microprocessor with an associated input port 11, a comparator 12 coupled to the microprocessor 10 and an input amplifier 13 and a voltage current converter 14 constructed in the usual way.
  • the evaluation arrangement is connected to a scanning arrangement 15, which can consist, for example, of a switch, which is coupled to a flap K of the tractors or to another switching device arranged inside the printing device and which serves to determine the loading of paper.
  • the evaluation arrangement delivers 16 scanning pulses AI at the output, which are evaluated by the control electronics of the printing device (not shown here) and which represent the actual monitoring signals during the transport of the record carrier, and at the output 17 a warning signal for the control electronics.
  • the case is considered that the paper is inserted and the edge perforations of the running paper are scanned.
  • the recording medium M made of non-reflective material is located above the reflection light barrier.
  • the phototransistor FT thus delivers an output signal UM via the amplifier 13 corresponding to the phototransistor current of slightly more than 1 V.
  • a perforation hole comes into the scanning area of the reflection light barrier and the scanning light beam of the reflection light barrier falls on the reflection surface RF.
  • the output level of the photoconductor transistor at the output of the amplifier 13 thus jumps to the reference level UR of slightly more than 3 V.
  • This reference level UR is the signal output level of the amplifier 13 at the reference distance RA when the light from the light-emitting diode falls on the reflection surface RF and reflects from it is received by the photo transistor FT.
  • the voltage jump UM to UR is detected by the comparator 12, which is set to a threshold of 2.5 V.
  • the threshold setting can be varied via the microprocessor 10.
  • the comparator 12 emits a scanning signal AI in the form of a rectangular pulse.
  • the comparator 12 is controlled by the microprocessor 10 so that when the pulse edge drops at time T3, ie when the edge of the scanning hole is reached when the reflection light barrier again scans the actual recording medium, no signal is emitted or the signal under is pressed. This ensures that only the front edge of the perforation holes is scanned.
  • the levels of the output signals of the photo transistor FT in connection with the amplifier 13 UM and UR depend on the current through the light-emitting diode LED and thus on the light output emitted by the light-emitting diode LED. Since the light-emitting diodes LEDs age and thus emit less light output with the same drive current, it is advantageous to take this into account.
  • the LED current is set so that the levels of the output signals of the phototransistors UM and UR are in the defined permissible ranges UZ. This ensures that the levels UM and UR come to be approximately in the middle of the threshold level of 2.5 V of the comparator 12.
  • the LED current is adjusted during a paper insertion cycle PE so that the monitoring threshold SP of the comparator 12 comes to lie approximately in the middle of the high and low levels UR and UM of the output signals of the photo transistor FT.
  • the microprocessor 10 detects the insertion of the paper into the printer with the aid of the scanning device 15 at the time T4, it triggers a paper insertion cycle PE for the adjustment of the LED current. This takes place in that during the paper loading cycle PE the microprocessor 10 first checks whether scanning signals AI are generated. If no scanning signals AI are generated, the threshold voltage of the monitoring threshold SP is inevitably not reached. This can either be due to the fact that there is a fault or that a recording medium with a reflection behavior is used, the monitoring threshold SP of which is not reached when it is scanned. By raising the material level UM and the reference level UR, the microprocessor first tries to ensure that the two levels come to lie in the permissible range UZ.
  • the microprocessor 10 outputs a warning signal to the control of the printing device via the output 17. The fault is then displayed on the control panel of the printing device.
  • the photoconductor current FT is set here starting from the microprocessor 10 via the port 11 with the aid of the voltage current converter 14.
  • the threshold SP is not reached and therefore no output pulse AI is generated.
  • the microprocessor circuit which, by changing and setting the LED current via the current-voltage converter 14, now tries to ensure that the two levels UM and UR come to lie in the permissible ranges UZ, ie essentially symmetrically to the threshold SP.
  • the microprocessor increases the LED current via the current-voltage converter by defined factors, which has the consequence that the levels UM and UR are multiplied by corresponding factors. In the example shown, the multiplication factor is 2, ie the LED current is increased twice. Change with that the UR level changes from 2 V to 4 V according to the arrow shown and the UM level of 0.5 V increases to 1 V.
  • the level therefore jumps from the level UM 0.5 V to the reference level UR of 4 V.
  • the comparator 12 thus generates a scanning pulse AI.
  • the reflection light barrier with its scanning beam reaches the other edge of the scanning hole and the scanning beam of the reflection light barrier is in turn reflected on the recording medium itself. So that the level jumps from UR to UM namely to the correspondingly adjusted material level UM of 1 V.
  • the light emitting diode current is adjusted via the microprocessor so that the levels UM and UR lie in the permissible range UZ and thus in the middle of the monitoring threshold SP. If the next leading edge of a scanning hole is reached at time T8, a new scanning pulse AI is thus generated via the comparator 12.
  • the level of the scanning pulses AI is determined by the comparator 12, a voltage source 18, which can be adjustable, which defines the monitoring threshold SP.
  • a corresponding warning signal is generated via the output 17, which interrupts the further printing operation.
  • a corresponding status is also displayed on the control panels of the printer via this warning signal 1.
  • FIG. 13 An adjustment arrangement according to FIG. 13 is provided, which makes it possible to carry out this basic adjustment outside the actual printing device.
  • the adjustment arrangement shown in FIG. 13 consists of a container 19 for receiving the reflection light barrier RL mounted on a printed circuit board L.
  • guide elements 20 are provided in the container 19, which hold and guide the reflection light barrier with the printed circuit board 11 in the frame 19 in an exact position. This can e.g. be simple screws.
  • a reflection surface RF is arranged on a side wall of the container 19 at the defined reference distance RA.
  • the container 19 has a connector plug 21 with which it is possible to couple a measurement and adjustment arrangement ME to the reflection light barrier RL.
  • the container 19 can be covered by a light-tight cover with e.g. an access opening to the trimming resistor R arranged on the printed circuit board L.
  • the measuring and adjusting arrangement ME contains an ammeter 22 for measuring the light-emitting diode current and a voltmeter 23 for measuring the level of the output signals of the photo transistor FT. Furthermore, a resistor 24 is arranged in the measuring and adjusting arrangement ME, which can have a value of 22 kOhm, for example, and which simulates the internal resistance of the amplifier 13. A voltage source 25 provides the necessary operating voltage. This operating voltage is normally 5 V corresponding to the operating voltage of the reflection light barrier in FIG. 11.
  • the reflection light barrier RL is anchored together with the printed circuit board L in the container 19 and coupled to the measuring and adjusting arrangement via a plug 26.
  • a basic adjustment of the reflection light barrier RL to, for example, an LED current of 10 mA is then carried out via the adjustment resistor R.
  • the actual assembly of the printed circuit board L with the reflection light barrier arranged thereon takes place at the installation location in the paper channel of the printing device.
  • the scanning arrangement has been described with reference to its use in the paper transport channel of a printing device. However, the scanning arrangement can also be used to scan materials of all kinds, for example fabric tapes in weaving mills or foils in the chemical industry or magnetic tapes etc.

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  • Facsimile Scanning Arrangements (AREA)
  • Controlling Sheets Or Webs (AREA)
EP19890122834 1989-12-11 1989-12-11 Capteur optique pour matériaux réfléchissants ou nonréfléchissants Expired - Lifetime EP0432289B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE89122834T DE58905565D1 (de) 1989-12-11 1989-12-11 Optischer Sensor für reflektierende und nichtreflektierende Materialien.
EP19890122834 EP0432289B1 (fr) 1989-12-11 1989-12-11 Capteur optique pour matériaux réfléchissants ou nonréfléchissants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19890122834 EP0432289B1 (fr) 1989-12-11 1989-12-11 Capteur optique pour matériaux réfléchissants ou nonréfléchissants

Publications (2)

Publication Number Publication Date
EP0432289A1 true EP0432289A1 (fr) 1991-06-19
EP0432289B1 EP0432289B1 (fr) 1993-09-08

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EP19890122834 Expired - Lifetime EP0432289B1 (fr) 1989-12-11 1989-12-11 Capteur optique pour matériaux réfléchissants ou nonréfléchissants

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EP (1) EP0432289B1 (fr)
DE (1) DE58905565D1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644139A1 (fr) * 1993-09-17 1995-03-22 MAN Roland Druckmaschinen AG Unité de marqeur de feuilles
DE10136873A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136870A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136871A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136874A1 (de) * 2001-07-28 2003-02-13 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
US20140231216A1 (en) * 2013-02-19 2014-08-21 Kabushiki Kaisha Toshiba Paper sheet processing apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036513B4 (de) * 2000-07-27 2008-10-23 Koenig & Bauer Aktiengesellschaft Einrichtung zur optischen Bogenkontrolle
DE102006019761A1 (de) * 2006-04-28 2007-10-31 Koenig & Bauer Aktiengesellschaft Bogenkontrolleinrichtung und Verfahren zur Bogendetektion
DE102008038770A1 (de) 2008-08-12 2010-02-25 OCé PRINTING SYSTEMS GMBH Verfahren und Anordnung zum Steuern eines Druckers oder Kopierers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033167A2 (fr) * 1980-01-11 1981-08-05 Océ-Nederland B.V. Dispositif pour détecter des objets sous forme de feuilles
EP0195105A1 (fr) * 1985-03-21 1986-09-24 Komori Printing Machinery Co., Ltd. Procédé et dispositif pour détecter des feuilles doubles dans une rotative pour feuilles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0033167A2 (fr) * 1980-01-11 1981-08-05 Océ-Nederland B.V. Dispositif pour détecter des objets sous forme de feuilles
EP0195105A1 (fr) * 1985-03-21 1986-09-24 Komori Printing Machinery Co., Ltd. Procédé et dispositif pour détecter des feuilles doubles dans une rotative pour feuilles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN vol. 21, no. 3, August 1978, WASHINGTON US Seiten 919 - 920; P. E. ABBOTT: "Gap sensor for highly reflective opaque documents" *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644139A1 (fr) * 1993-09-17 1995-03-22 MAN Roland Druckmaschinen AG Unité de marqeur de feuilles
DE10136873A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136870A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136871A1 (de) * 2001-07-28 2003-02-06 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
DE10136874A1 (de) * 2001-07-28 2003-02-13 Koenig & Bauer Ag Einrichtung zum Erfassen der Lage einer Kante eines Verarbeitungsgutes
US20140231216A1 (en) * 2013-02-19 2014-08-21 Kabushiki Kaisha Toshiba Paper sheet processing apparatus
US9290346B2 (en) * 2013-02-19 2016-03-22 Kabushiki Kaisha Toshiba Paper sheet processing apparatus

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Publication number Publication date
EP0432289B1 (fr) 1993-09-08
DE58905565D1 (de) 1993-10-14

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