DE2846915A1 - Tape measure with automatic digital read=out - uses direct fine division marking observation to avoid tape contamination errors - Google Patents

Tape measure with automatic digital read=out - uses direct fine division marking observation to avoid tape contamination errors

Info

Publication number
DE2846915A1
DE2846915A1 DE19782846915 DE2846915A DE2846915A1 DE 2846915 A1 DE2846915 A1 DE 2846915A1 DE 19782846915 DE19782846915 DE 19782846915 DE 2846915 A DE2846915 A DE 2846915A DE 2846915 A1 DE2846915 A1 DE 2846915A1
Authority
DE
Germany
Prior art keywords
tape
tape measure
scanning
markings
digital display
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
DE19782846915
Other languages
German (de)
Other versions
DE2846915C2 (en
Inventor
Hans Keller
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.)
KELLER BAYER MASS IND
Bayerische Mass Industrie Arno Keller GmbH
Original Assignee
KELLER BAYER MASS IND
Bayerische Mass Industrie Arno Keller 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 KELLER BAYER MASS IND, Bayerische Mass Industrie Arno Keller GmbH filed Critical KELLER BAYER MASS IND
Priority to DE2846915A priority Critical patent/DE2846915C2/en
Publication of DE2846915A1 publication Critical patent/DE2846915A1/en
Application granted granted Critical
Publication of DE2846915C2 publication Critical patent/DE2846915C2/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10Measuring tapes
    • G01B3/1061Means for displaying or assisting reading of length measurement
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10Measuring tapes
    • G01B3/1061Means for displaying or assisting reading of length measurement
    • G01B3/1069Electronic or mechanical display arrangements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10Measuring tapes
    • G01B3/1061Means for displaying or assisting reading of length measurement
    • G01B2003/1064Windows, e.g. lenses, glasses or cross-hairs

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Tape Measures (AREA)

Abstract

A tape measure has a measurement tape with markings whose withdrawn length is determined and displayed by a sensor and processing device with a digital display. The problems inherent in optoelectronic reading of the fine divisions required for millimetre accuracy, e.g. dirt on the tape, are avoided by using the digital display(5) to show coarse division readings, i.e. centimetres, and having a direct observation window(6) for the fine divisions(3) or millimeteres. Therefore the bright-dark optical sensor scans special markings(4) for centimetres and the observation window has a reference mark(7) for fine reading. Alternatively, electronic scanning markers could replace the brightness -darkness fields on the tape. The direct visual display window can be a lens, thus magnifying the scale for more accurate reading.

Description

"Rollbandmaß" "Tape measure"

Die Erfindung bezieht sich auf ein Rollbandmaß, insbesondere Taschenrollbandmaß, mit einem aus einem Bandmaßgehäuse ausziehbaren, mit Abtastmarkierungen versehenen Meßband, dessen Auszuglänge über eine Abtasteinrichtung und ein Rechenwerk ermittelt und auf einer digitalen Anzeigevorrichtung angezeigt wird.The invention relates to a tape measure, in particular a pocket tape measure, with a pull-out from a tape measure housing provided with scanning markings Measuring tape, whose extension length is determined by a scanning device and an arithmetic unit and displayed on a digital display device.

In der Vergangenheit sind bereits eine Vielzahl derartiger Rollbandmaß vorgeschlagen worden. Wegen der Schwierigkeiten sowohl bei der genauen Herstellung von Lochteilungen oder der Abtastung mittels beim Bandauszug mitbewegten Abtastrollen gehen in jüngster Zeit die Vorschläge zunehmend dahin, das Meßband mit einer elektrisch und/oder optisch abtastbaren Markierung zu versehen, die über entsprechende elektrische oder optische Abtasteinrichtungen zusätzlich eine einfache rechnerische Weiterverarbeitung der gewonnenen Signale ermöglicht.A large number of such tape measures have already been used in the past has been proposed. Because of the difficulties in both exact manufacture of hole pitches or the scanning by means of scanning rollers that move along with the tape pull-out Recently, the proposals increasingly go there, the measuring tape with an electric and / or to provide optically scannable marking that has corresponding electrical or optical scanners in addition, a simple arithmetic Enables further processing of the signals obtained.

Bei den bevorzugten optischen Abtastsystemen verwendet man üblicherweise Hell-Dunkelfelder auf dem Meßband, die über die optische Abtasteinrichtung elektrische Signale liefern,die in einem elektronischen Zähler weiterverarbeitet werden Um eine milimetergenaue Anzeige zu erhalten, müssen die Hell-Dunkelfeldmarkierungen für die optische Bandabtastung außerordentlich fein geteilt sein, was nicht nur erhebliche Fertigungsschwierigkeiten bedeutet. Hinzu kommt, daß infolge der unvermeidlichen Verschmutzung derartiger Meßbänder die Hell-Dunkelmarkierungen zumindest stellenweise nicht mehr genau genug unterscheidbar sind, so daß entsprechende Fehlabtastungen und damit Fehlanzeigen der Bandauszugslänge auftreten.The preferred optical scanning systems are commonly used Light-dark fields on the measuring tape, which are electrical via the optical scanning device Deliver signals that are further processed in an electronic counter To obtain a display that is accurate to the millimeter, the light-dark field markings for the optical band scan can be extremely finely divided, which is not only considerable Means manufacturing difficulties. On top of that, as a result of the inevitable Soiling of such measuring tapes, at least in places, the light-dark markings can no longer be distinguished precisely enough, so that corresponding incorrect scans and thus incorrect displays of the tape extension length occur.

Um diese Schwierigkeiten zu vermeiden, ist gemäß der vorliegenden Erfindung bei einem Rollbandmaß der eingangs genannten Art vorgesehen, daß die Abtastmarkierungen nur jeweils eine Grobteilung, insbesondere die Zentimeter, wiedergeben und daß das Bandmaßgehäuse mit einem vorzugsweise neben der digitalen Anzeigevorrichtung angeordneten Sichtfenster zum direkten Ablesen einer auf dem Meßband angebrachten Feinteilung, insbesondere den Milimetern, versehen ist0 Durch diese Ausbildung lassen sich in einer auch unter rauhen Betriebsbedingungen praktikablen Weise die Vorteile der beiden Meßsysteme miteinander vereinigen. Die direkte Anzeige der Zentimeter über die digitale Anzeigevorrichtung wird ergänzt durch die genaue Milimeterangabe, wozu nur ein Bereich von etwa einem Zentimeter im Sichtfeld des Bandmaßgehäuses erkennbar zu sein braucht.In order to avoid these difficulties, according to the present Invention provided with a tape measure of the type mentioned that the scanning marks only reproduce a rough division, especially the centimeters, and that that Tape measure housing with a preferably arranged next to the digital display device Viewing window for direct reading of a fine graduation attached to the measuring tape, in particular the millimeters, is provided 0 Through this training can be used in a way that is practicable even under harsh operating conditions Combine the advantages of the two measuring systems. The direct display of the centimeters The digital display device is supplemented by the exact millimeter information, including only an area of about one centimeter in the field of view of the tape measure housing needs to be recognizable.

Diese Feinteilung, insbesondere tfilimeterteilung des Bandmaßes benötigt keinerlei Zahlenangaben, wie eter oder Zentimeter, da diese direkt durch die elektronische Abtastung gewonnen werden, so daß es auch keine Rolle spielt, ob man das Band außerhalb des BandmaSehäuses üerhaupt erkennen kann, was bei herkömmlichen Bandmaßen mit Sichtfensterablesung unerläßlich ist, um Meter und Zentimeter ablesen zu können, sofern nan nicht - was sich aber in der Praxis nicht gut bewährt hat - die Längenangaben je Zentimeter auf das Meßband aufdruckt.This fine division, in particular tfilimeter division of the tape measure, is required no figures, such as meters or centimeters, as these are transmitted directly by the electronic Sampling can be obtained, so it doesn't matter whether you put the tape outside of the tape measure housing can at all recognize what is happening with conventional tape measures with viewing window reading is essential to be able to read meters and centimeters, unless nan - what but has not proven itself well in practice - the length specifications per centimeter printed on the measuring tape.

Mit besonderem Vorteil sollen die Abtastmarkierungen, insbesondere in Form optisch erfaßbarer Hell-Dunkelfelder, und die Feinteilung (Milimeterteilung) jeweils längs unterschiedlicher Bandkanten des Meßbandes angeordnet sein.The scanning markings, in particular in the form of optically detectable light-dark fields, and the fine division (millimeter division) be arranged along different tape edges of the measuring tape.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführjngsbeispiels sowie an Hand der Zeichnung. Dabei zeigen: Figur 1 eine perspektivische Ansicht eines erfindungsgemäßen Taschenrollbandmaßes und Figur 2 eine Draufsicht auf die Anordnung nach Figur 1.Further advantages, features and details of the invention result from the following description of an exemplary embodiment as well as from hand the drawing. They show: FIG. 1 a perspective view of a device according to the invention Pocket tape measure and Figure 2 is a plan view of the arrangement according to Figure 1.

Das im Bandmaßgehäuse 1 in bekannter Weise aufrollbare,unter der irkun einer Rückholfeder stehende Meßband 2 ist längs der einen -Bandkante mit einer Milimeter-Feinteilung 3 und längs der anderen Bandkante mit Hell-Dunkelfeld-Markierungen 4 versehen, die von einer im Innern des Bandmaßgehäuses angeordneten optischen Abtastvorrichtung abgetastet und über einen elektronischen Rechner auf einer digitalen Anzeigevorrichtung 5 direkt als Auszugslänge des Bandes abgelesen werden könnten, Dabei sind die Abtastmarkierungen 4 derart grob und damit gegen Verschmutzungen unempfindlich angeordnet, daß sie nur eine Zentimeterablesung der Bandauszugslänge ermöglichen0 Die zugehörigen Milimeterangaben lassen sich durch ein neben der digitalen Anzeigevorrichtung 5 angeordnetes Sichtfenster 6 mit einer Ablesemarkierung 7 unmittelbar von der Milimeterskala 3 des Meßbandes 2 ablesen. Zur Erleichterung des Ablesens kann dabei das Sichtfenster 6 gegebenenfalls linsenartig ausgebildet sein, so daß über eine Lupe eine Vergrößerung der Milimeterskala erfolgt, die ersichtlich ja nur auf etwa 1 cm erkennbar zu sein braucht.The rollable in the tape measure housing 1 in a known manner, under the irkun a return spring standing measuring tape 2 is along the one tape edge with a millimeter graduation 3 and along the other edge of the tape with light-dark field markings 4, which from an optical scanning device located inside the tape measure housing scanned and via an electronic calculator on a digital display device 5 could be read off directly as the extension length of the tape, with the scanning marks 4 arranged so roughly and thus insensitive to contamination that they only allow a centimeter reading of the tape extension length 0 The associated millimeter information can be through a viewing window arranged next to the digital display device 5 6 with a reading mark 7 directly from the millimeter scale 3 of the measuring tape Read off 2. To facilitate reading, the viewing window 6 can optionally be used Be designed like a lens, so that a magnifying glass can be used to enlarge the millimeter scale takes place, which obviously only needs to be recognizable to about 1 cm.

Die Erfindung ist nicht auf das dargestellte Ausführungsbeispiel beschränkt. So könnte anstelle der optischen Hell-Dunkelfeldabtastmarkierung auch eine andere elektronische Abtastmarkierung auf dem Meßband vorgesehen sein. Darüber hinaus braucht die elektronisch abgetastete Grobrasterung selbstverständlich nicht unbedingt einer Zentimeterskala zu entsprechen, sondern kann auch in einer anderen Teilung erfolgen.The invention is not limited to the illustrated embodiment. Instead of the optical light-dark field scanning marking, a different one could also be used electronic scanning mark can be provided on the measuring tape. In addition, needs the Electronically scanned coarse grids are of course not necessarily to correspond to one centimeter scale, but can also be in another Division take place.

Claims (2)

Patentansprüche: Rollbandmaß, insbesondere Taschenrollbandmaß, mit einem aus einem Bandmaßgehäuse ausziehbaren,mit Abtastmarkierungen versehenen Meßband,dessen Äuszuglänge über eine Abtasteinrichtung und ein Rechenwerk ermittelt und auf einer digitalen Anzeigevorrichtung angezeigt wird, dadurch gekennzeichnet, daß die Abtastmarkierunen (4) nur jeweils eine Grobteilung, insbesondere die Zentimeter, wiedergeben und daß das Bandmaßgehäuse (1) mit einem vorzugsweise neben der digitalen Anzeigevorrichtung (5) angeordneten Sichtfenster (6) zum direkten Ablesen einer auf dem Meßband (2) angebrachten Feinteilung (3) versehen ist0 Claims: tape measure, especially pocket tape measure, with a measuring tape which can be pulled out of a tape measure housing and is provided with scanning marks Äuszuglänge determined via a scanning device and an arithmetic unit and on a digital display device, characterized in that the scanning markings (4) only reproduce a rough division, in particular the centimeters, and that the tape measure housing (1) with a preferably next to the digital display device (5) arranged viewing window (6) for direct reading of an on the measuring tape (2) attached fine division (3) is provided 0 2. Rollbandmaß nach Ansprch 1, dadurch gekennzeichnet, daß die Abtastmarkierungen (4) und die Feinteilung (3) jeweils längs unterschiedlicher Bandkanten des Meßbandes (2) angeordnet sind, 3s Rollbandmaß nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die llbtastmarkierun-«en (4) durch eine optische Abtasteinrichtun erfaßbare Iieil-Dunkelfelder sind.2. Roll tape measure according to claim 1, thereby characterized in that the scanning markings (4) and the fine graduation (3) are each longitudinal different tape edges of the measuring tape (2) are arranged, 3s tape measure according to Claim 1 or 2, characterized in that the scanning markings (4) pass through an optical scanning device are detectable dark fields.
DE2846915A 1978-10-27 1978-10-27 Tape measure Expired DE2846915C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2846915A DE2846915C2 (en) 1978-10-27 1978-10-27 Tape measure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2846915A DE2846915C2 (en) 1978-10-27 1978-10-27 Tape measure

Publications (2)

Publication Number Publication Date
DE2846915A1 true DE2846915A1 (en) 1980-05-08
DE2846915C2 DE2846915C2 (en) 1982-06-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202566A1 (en) * 1981-01-27 1982-08-12 Mitutoyo Mfg. Co., Ltd., Tokyo Contact-point measuring device
US4890392A (en) * 1985-01-08 1990-01-02 Kyoto Measuring Instruments Corp. Digital tape measure
US5027526A (en) * 1989-06-02 1991-07-02 Crane R Stephen Digital linear measuring device
US5060394A (en) * 1989-04-20 1991-10-29 Homestar International Inc. Measuring apparatus with readout display
FR2695201A1 (en) * 1992-08-28 1994-03-04 Robert Petitnicolas Measuring tape with associated magnifying glass - has sealed casing housing tape and its actuating spring while compartment above houses magnifying glass on cylindrical sliding axle
CN107246831A (en) * 2017-07-19 2017-10-13 深圳市四六区工业产品策划有限公司 Measure tape measure
US10859363B2 (en) 2017-09-27 2020-12-08 Stanley Black & Decker, Inc. Tape rule assembly with linear optical encoder for sensing human-readable graduations of length

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406715A (en) * 1992-07-07 1995-04-18 Mitutoyo Corporation Tape measure device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706336A (en) * 1950-10-10 1955-04-19 Jack Hungerle Measuring device for linear measurements
FR1241202A (en) * 1959-08-03 1960-12-23 Desauge & Lair Linear measuring device for direct reading of interior measurements
CH516783A (en) * 1970-04-22 1971-12-15 Hoechstmass Balzer Gmbh & Co Length measuring device with color-changing decimeter divisions on the measuring scale
DE2850940A1 (en) * 1977-11-25 1979-06-21 Stanley Works TAPE MEASURING DEVICE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706336A (en) * 1950-10-10 1955-04-19 Jack Hungerle Measuring device for linear measurements
FR1241202A (en) * 1959-08-03 1960-12-23 Desauge & Lair Linear measuring device for direct reading of interior measurements
CH516783A (en) * 1970-04-22 1971-12-15 Hoechstmass Balzer Gmbh & Co Length measuring device with color-changing decimeter divisions on the measuring scale
DE2850940A1 (en) * 1977-11-25 1979-06-21 Stanley Works TAPE MEASURING DEVICE

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3202566A1 (en) * 1981-01-27 1982-08-12 Mitutoyo Mfg. Co., Ltd., Tokyo Contact-point measuring device
US4890392A (en) * 1985-01-08 1990-01-02 Kyoto Measuring Instruments Corp. Digital tape measure
US5060394A (en) * 1989-04-20 1991-10-29 Homestar International Inc. Measuring apparatus with readout display
US5027526A (en) * 1989-06-02 1991-07-02 Crane R Stephen Digital linear measuring device
FR2695201A1 (en) * 1992-08-28 1994-03-04 Robert Petitnicolas Measuring tape with associated magnifying glass - has sealed casing housing tape and its actuating spring while compartment above houses magnifying glass on cylindrical sliding axle
CN107246831A (en) * 2017-07-19 2017-10-13 深圳市四六区工业产品策划有限公司 Measure tape measure
US10859363B2 (en) 2017-09-27 2020-12-08 Stanley Black & Decker, Inc. Tape rule assembly with linear optical encoder for sensing human-readable graduations of length

Also Published As

Publication number Publication date
DE2846915C2 (en) 1982-06-09

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