EP0364776A2 - Appareil de dessin - Google Patents

Appareil de dessin Download PDF

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Publication number
EP0364776A2
EP0364776A2 EP89117867A EP89117867A EP0364776A2 EP 0364776 A2 EP0364776 A2 EP 0364776A2 EP 89117867 A EP89117867 A EP 89117867A EP 89117867 A EP89117867 A EP 89117867A EP 0364776 A2 EP0364776 A2 EP 0364776A2
Authority
EP
European Patent Office
Prior art keywords
rail
strip
field sensors
magnetic field
plate
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Withdrawn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
EP89117867A
Other languages
German (de)
English (en)
Other versions
EP0364776A3 (fr
Inventor
Hans-Joachim Schrodt
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.)
Aristo Graphic Systeme GmbH and Co KG
Original Assignee
Aristo Graphic Systeme GmbH and Co KG
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 Aristo Graphic Systeme GmbH and Co KG filed Critical Aristo Graphic Systeme GmbH and Co KG
Publication of EP0364776A2 publication Critical patent/EP0364776A2/fr
Publication of EP0364776A3 publication Critical patent/EP0364776A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L5/00—Drawing boards
    • B43L5/005—Drawing boards with magnetic action

Definitions

  • the invention relates to a drawing device with a plate-shaped drawing pad and a ruler element which can be moved guided over the drawing pad, and with a length measuring device which has a scanning device held on the ruler element with at least one sensor for scanning a length division provided in or on the plate-shaped drawing pad .
  • a known drawing device of this type in the form of a carriage drawing machine has an electro-optical sensor on each carriage, with the aid of which a grid-shaped length division is scanned, which is provided on the associated running rail.
  • this length measuring device is relatively complex to manufacture, it can be used to carry out an exact length measurement, in particular since the carriage and the associated running rail are moved relative to one another with tight tolerances in a fixed position assignment, the The distance between the electro-optical sensor and the grid-shaped length division does not change during operation.
  • the invention relates to a drawing device of the type mentioned at the outset, which is characterized in that the drawing base is a drawing board and the ruler element is a drawing rail guided on one side, in that the length division consists of a strip of material which is alternately positively and negatively magnetized in the direction of the longitudinal extent of the strip and that at least two magnetic field sensors are provided, which are fastened next to one another and at the same distance from the support plane of the drawing rail in the direction of the longitudinal extent of the strip and are each arranged in a branch of a Wheatstone bridge circuit.
  • the drawing base thus consists of a drawing board and the ruler element consists of a drawing rail which is guided on one side of the drawing board.
  • the drawing base thus consists of a drawing board and the ruler element consists of a drawing rail which is guided on one side of the drawing board.
  • a specially designed scanning device in the form of two magnetic field sensors is used in the drawing device according to the invention, which are fastened next to each other and at the same height from the support plane of the drawing rail in the direction of the longitudinal extent of the strip forming the longitudinal division, so that these two magnetic field sensors when changed of the distance of the drawing rail from the drawing plate determine a change in intensity of the magnetic field which is the same for both magnetic field sensors. Since the two magnetic field sensors are arranged in different branches of a Wheatstone bridge circuit, this change in intensity leads to equally large signal changes in the two branches of the bridge circuit, i.e. the difference in the signals in the branches of the bridge circuit remains the same, and for this reason the signal change is not interpreted as a displacement movement along the length division.
  • Magnetic field sensors are those which are available in the form of a component (e.g. KMZ 10A from Valvo GmbH) in which four similar magnetic field sensors are combined and connected to form a Wheatstone bridge circuit and which can be attached to the drawing rail in such a way that the magnetic field sensors lie in a plane essentially perpendicular to the support plane of the drawing rail and the two magnetic field sensors closer to the support plane are oriented such that they lie next to one another in the direction of the longitudinal extent of the strip of magnetized material.
  • a component e.g. KMZ 10A from Valvo GmbH
  • four similar magnetic field sensors are combined and connected to form a Wheatstone bridge circuit and which can be attached to the drawing rail in such a way that the magnetic field sensors lie in a plane essentially perpendicular to the support plane of the drawing rail and the two magnetic field sensors closer to the support plane are oriented such that they lie next to one another in the direction of the longitudinal extent of the strip of magnetized material.
  • the strip of magnetized material can be embedded in the drawing board and thus close with its upper surface to the surface of the drawing board.
  • the strip can be arranged adjacent to the guide of the drawing rail.
  • the drawing plate 1 shown is essentially of conventional design and has guide ribs 3, 4, 5, 6 on its four sides for guiding a drawing rail 10.
  • a conventional clamping rail 2 for fastening the drawing material extends parallel to the guide rib 3. Between this clamping rail 2 and the guide rib 3, a strip 7 of alternately positive and negative magnetized material is embedded in the drawing plate, the function of which will be described later.
  • the drawing rail 10 has guide ribs 15 and 16 at one end, with the aid of which the drawing rail 10 can be displaced along the respective guide rib, for example the guide rib 3 of the drawing plate 1.
  • a housing 11 is fastened to the upper side thereof and can accommodate a clamping device (not shown), as is customary with such guide rails.
  • the housing 11 contains a display 12, such as an LCD display and control buttons 13 and 14, with the help of which, among other things. the display can be reset to zero without the circuit details required for this being shown.
  • a scanning device in the form of a module or chip 20 is provided in the drawing rail, the underside or the underside of which is exposed and, as shown in FIG 3 of the drawing board 1 is.
  • the chip 20 forming the scanning device is, for example, a chip with the type designation KMZ 10A from Valvo GmbH and contains four magnetic field sensors 21, 22, 23, 24 (FIG. 4), all of which are arranged in one plane and are connected to form a Wheatstone bridge.
  • the two magnetic field sensors 21 and 22 each lie in a branch of the bridge, that is to say the magnetic field sensor 21 in the branch with the Manget field sensor 23 and the magnetic field sensor 22 in a branch with the magnetic field sensor 24.
  • the magnetic field sensors 21 and 22 are in a position directly next to one another and at the same distance from the lower edge (FIG. 4) of the component or chip 20. This component or chip 20 is inserted into the drawing rail 10 such that its lower edge (FIG.
  • the magnetic field sensors 21 and 22 firstly count the zero crossings of the curves according to FIG. 5 and thus count the overflowed 2.5 mm regions between adjacent magnetic north and South Poland and on the other hand, by the above-mentioned subdivision in the direction of the amplitude, an exact determination of the position within 2.5 mm regions which are not completely overrun, ie in this way, the distance covered by the drawing rail 10 when moving from one position to another can be determined precisely.

Landscapes

  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Drawing Aids And Blackboards (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
EP19890117867 1988-10-15 1989-09-27 Appareil de dessin Withdrawn EP0364776A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883835364 DE3835364C1 (fr) 1988-10-15 1988-10-15
DE3835364 1988-10-15

Publications (2)

Publication Number Publication Date
EP0364776A2 true EP0364776A2 (fr) 1990-04-25
EP0364776A3 EP0364776A3 (fr) 1991-12-27

Family

ID=6365321

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890117867 Withdrawn EP0364776A3 (fr) 1988-10-15 1989-09-27 Appareil de dessin

Country Status (3)

Country Link
EP (1) EP0364776A3 (fr)
JP (1) JPH02171298A (fr)
DE (1) DE3835364C1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4029963A1 (de) * 1990-09-21 1992-03-26 Aristo Graphic Systeme Zeicheneinrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915422A1 (de) * 1979-04-17 1980-10-30 Kuhlmann Praezisionsmech Einrichtung zur ortsbestimmung des laufwagens einer laufwagen-zeichenmaschine
DE3027931A1 (de) * 1979-07-27 1981-02-19 Los Angeles Scient Instr Universal-digitalwandler fuer zeichenmaschinen
DE3314344A1 (de) * 1983-04-20 1984-10-25 Walter Hebel Gmbh & Co, 5242 Kirchen Zeichenplatte mit zeichenschiene
EP0155391A1 (fr) * 1984-01-07 1985-09-25 DODUCO KG. Dr. Eugen Dürrwächter Dispositif pour mesurer des courants électriques utilisant un capteur de champs magnétiques
WO1987005863A1 (fr) * 1986-04-03 1987-10-08 Frazer Design Consultants Limited Instrument de dessin oriente magnetiquement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1264997B (de) * 1963-11-08 1968-03-28 Gottlieb Bullinger Dr Ing Zeicheneinrichtung mit einem auf eine oder mehrere Grundrichtungen einstellbaren Lineal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915422A1 (de) * 1979-04-17 1980-10-30 Kuhlmann Praezisionsmech Einrichtung zur ortsbestimmung des laufwagens einer laufwagen-zeichenmaschine
DE3027931A1 (de) * 1979-07-27 1981-02-19 Los Angeles Scient Instr Universal-digitalwandler fuer zeichenmaschinen
DE3314344A1 (de) * 1983-04-20 1984-10-25 Walter Hebel Gmbh & Co, 5242 Kirchen Zeichenplatte mit zeichenschiene
EP0155391A1 (fr) * 1984-01-07 1985-09-25 DODUCO KG. Dr. Eugen Dürrwächter Dispositif pour mesurer des courants électriques utilisant un capteur de champs magnétiques
WO1987005863A1 (fr) * 1986-04-03 1987-10-08 Frazer Design Consultants Limited Instrument de dessin oriente magnetiquement

Also Published As

Publication number Publication date
JPH02171298A (ja) 1990-07-02
EP0364776A3 (fr) 1991-12-27
DE3835364C1 (fr) 1990-03-29

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