WO1994010656A1 - Systeme d'identification detectable par machine, pour pieces metalliques - Google Patents

Systeme d'identification detectable par machine, pour pieces metalliques Download PDF

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Publication number
WO1994010656A1
WO1994010656A1 PCT/AT1993/000171 AT9300171W WO9410656A1 WO 1994010656 A1 WO1994010656 A1 WO 1994010656A1 AT 9300171 W AT9300171 W AT 9300171W WO 9410656 A1 WO9410656 A1 WO 9410656A1
Authority
WO
WIPO (PCT)
Prior art keywords
characters
identifier
character
markings
machine
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.)
Ceased
Application number
PCT/AT1993/000171
Other languages
German (de)
English (en)
Inventor
Kurt Stangl
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1994010656A1 publication Critical patent/WO1994010656A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • G06K19/06018—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking one-dimensional coding
    • G06K19/06028—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking one-dimensional coding using bar codes

Definitions

  • the invention relates to a machine-readable identifier for metallic workpieces, consisting of surface markings which form individual characters that can be distinguished from one another and are successive in a reading direction.
  • the legibility of optoelectronically detected identifiers depends crucially on the contrast of the characters forming the identifier with respect to the surface having these characters and the accuracy with which the characters to be detected match the respective comparison characters specified by the measuring device. For this reason, the reliable detection of identifiers is impaired if a different surface texture has to be expected, which reproduces the characters of the identifier with little contrast or in a geometrical shape that does not exactly match the comparative characters, as is the case with metallic workpieces the case is.
  • the image of the identifier which can be detected by an optoelectronic reading device depends on the respective lighting and the often random surface condition in the region of the stamp. Similar difficulties also arise with color inscriptions of hot metal surfaces in particular because of the unavoidable change with later flaking of the scale and thus with uneven surface images of the individual characters of the identifier must be expected.
  • This arithmetically complex reading process serves to be able to check whether a pixel detected on the basis of the existing contrast can be attributed to a character or forms a defect, because the lines of the characters from the disturbances are based on selected polygons aligned with the main directions can be distinguished. Since badly damaged lines are lost in the combination of these polygons and some faults can be incorrectly connected with the characters, additional measures which increase the reading effort are required without actually obtaining the certainty that the identification of the workpiece was recorded correctly.
  • the invention is therefore based on the object of creating a machine-readable identifier for metallic workpieces which can be detected without any particular effort and without any particular effort.
  • the invention achieves the object in that the surface markings forming the individual characters dissolve determine a direction of the workpiece surface which, with a predetermined reference direction, encloses an angle characterizing the respective character.
  • the surface markings can be formed in a conventional manner by stamped stamps or by color markings. It is crucial that these surface markings have a certain angular orientation for each character.
  • the surface markings for a character can consist of point markings arranged along a straight line which determine a unique angular position for each character.
  • Another possibility of designing surface markings is to represent each character by means of a straight marking bar which runs at an angle of inclination to a reference direction which is characteristic of the character to be represented.
  • Fig. 1 shows an identifier according to the invention in connection with a conventional identifier in a plan view
  • Fig. 2 shows a variant of an embodiment of the invention also in plan view.
  • an identifier 2 made of conventional numbers is stamped on a metallic workpiece 1, for example a hot rolling stock. Since these digits composed of individual bars cannot be read with sufficient security with the aid of an optoelectronic reading device, an additional identifier 3 is provided from surface markings 4, which consist of marking bars and each form a character 5 that differs from the other characters distinguishes the identifier by the angular position of its orientation relative to a reference direction. Assuming that this reference direction 6 coincides with the reading direction, the marking bars 4 of the different characters 5 with the reference direction 6 enclose different angles ° ⁇ which are characteristic of the respective character.
  • the direction of the marking bar 4 with the reference direction 6 closes an angle of 0 ⁇ for the value 0 and 6 for the value 6 an angle of 90 °, as can be seen in FIG. 1. Since the directions of the individual characters 5 and thus the angle cxi can be determined with sufficient accuracy for reliable detection of the individual characters using conventional optoelectronic reading devices, such an identifier 3 can ensure their unambiguous readability, even if individual characters are impaired in their outline shape or defects appear in the workpiece surface, of which it is initially not certain whether they belong to a character or not. It is only necessary to determine the direction of the characters 5, the bar lengths being adapted to the respective conditions can to exclude interference with certainty.
  • the direction of the individual characters 5 is determined by punctiform surface markings 4, which are arranged along a straight line for each character, the angle of inclination ⁇ > £ with respect to the reference direction 6 is characteristic of the respective character. Since the angular positions of the straight lines were chosen in accordance with FIG. 1, the characters 5 result in the number sequence 111992. In this case too, the straight lines determined by the punctiform surface markings 4 can be determined in their course with the help of an optoelectronic reading device so that reading the identifier is not difficult. In order to eliminate impurities in the surface of the workpiece 1 lying outside the straight line from the outset, a reading screen can be used which covers these impurities. The characters 5 to be read can only run in the given directions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Character Input (AREA)

Abstract

L'invention concerne un système d'identification (3) détectable par machine, dans laquelle les repères superficiels (4) qui constituent les caractères (5) individuels, déterminent au niveau de la surface de la pièce une direction qui forme, avec une direction de référence (6) prédéfinie, un angle α caractéristique pour chacun des caractères (5).
PCT/AT1993/000171 1992-11-05 1993-11-04 Systeme d'identification detectable par machine, pour pieces metalliques Ceased WO1994010656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT218592 1992-11-05
ATA2185/92 1992-11-05

Publications (1)

Publication Number Publication Date
WO1994010656A1 true WO1994010656A1 (fr) 1994-05-11

Family

ID=3529539

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1993/000171 Ceased WO1994010656A1 (fr) 1992-11-05 1993-11-04 Systeme d'identification detectable par machine, pour pieces metalliques

Country Status (1)

Country Link
WO (1) WO1994010656A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145838A2 (fr) * 1983-11-03 1985-06-26 LGZ LANDIS & GYR ZUG AG Dispositif de représentation et de saisie du contenu de compteurs à rouleaux
US4810867A (en) * 1987-02-04 1989-03-07 M. E. Cunningham Company Bar code marking the surface of an object

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145838A2 (fr) * 1983-11-03 1985-06-26 LGZ LANDIS & GYR ZUG AG Dispositif de représentation et de saisie du contenu de compteurs à rouleaux
US4810867A (en) * 1987-02-04 1989-03-07 M. E. Cunningham Company Bar code marking the surface of an object

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