DD297233A5 - ARRANGEMENT FOR POSITION FIXING OF A FLEXIBLE DIVISION OF A LENGTH MEASUREMENT SYSTEM ON A MACHINE - Google Patents
ARRANGEMENT FOR POSITION FIXING OF A FLEXIBLE DIVISION OF A LENGTH MEASUREMENT SYSTEM ON A MACHINE Download PDFInfo
- Publication number
- DD297233A5 DD297233A5 DD90343321A DD34332190A DD297233A5 DD 297233 A5 DD297233 A5 DD 297233A5 DD 90343321 A DD90343321 A DD 90343321A DD 34332190 A DD34332190 A DD 34332190A DD 297233 A5 DD297233 A5 DD 297233A5
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- division
- nozzle
- graduation carrier
- scanning
- carrier
- Prior art date
Links
- 238000005259 measurement Methods 0.000 title description 3
- 239000006260 foam Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
- G01D5/12—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 using electric or magnetic means
- G01D5/14—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 using electric or magnetic means influencing the magnitude of a current or voltage
-
- 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
- G01D5/347—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 using displacement encoding scales
- G01D5/34746—Linear encoders
- G01D5/34753—Carriages; Driving or coupling means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
Description
Hierzu 1 Seite ZeichnungFor this 1 page drawing
Die Erfindung ist anwendbar bei translatorischen Meßsystemen, bei denen die Positionsinformation durch Abtastung einer Teilung auf einem flexiblen, bandförmigen Teilungsträger mittels eines Tastkopfes gewonnen wird.The invention is applicable to translational measuring systems in which the position information is obtained by scanning a graduation on a flexible band-shaped graduation carrier by means of a probe head.
(US 3816002, DD 269439 AD.(US 3816002, DD 269439 AD.
und Abtasteinheit quer zur Moßrichtung die Meßgenauigkeit beeinträchtigen bzw. zum Meßsystemausfall führen.and scanning unit across the Moßrichtung affect the accuracy and lead to Meßsystemausfall.
ist. Darüber hinaus ist das flexible Band breiter als der Schaumstoffkörper, so daß am vorspringenden Bandbereichis. In addition, the flexible band is wider than the foam body, so that at the projecting band area
für die gesamte Meßlänge erforderlich ist.is required for the entire measuring length.
vernachlässigbar ist.is negligible.
daß im Normalfall der Teilungsträger mit der Abtasteinrichtung nicht in Berührung steht. Bei zu großen Relativverlagerungen zwischen dem flexiblen Teilungsträger und der Abtasteinrichtung wird der flexible Teilungsträger durch diethat in the normal case the graduation carrier is not in contact with the scanning device. With too large relative displacements between the flexible graduation carrier and the scanner of the flexible graduation carrier is through
zwischen Begrenzungselementen und Teilungsträger erreicht werden. Weiterhin wurde eine Lösung vorgeschlagen, bei der einebe achieved between boundary elements and graduation carrier. Furthermore, a solution has been proposed in which a
zwangsweise Zuordnung des gespannten elastischen Teilungsträger.3 in der Abtasteinrichtung durch mindestens zwei Führungselemente erfolgt, die In der Abtasteinrichtung so angeordnet sind, daß eine ständige Berührung gegeben ist. Diese Anordnung hat die Nachtelle, daß Meßfehler verursachende Kräfte und ein höherer Verschleiß am Teilungsträger auftreten können.forcibly assigning the tensioned elastic Teilungsträger.3 in the scanning device by at least two guide elements, which are arranged in the scanning device so that a constant contact is given. This arrangement has the disadvantage that measuring error causing forces and a higher wear on the graduation carrier can occur.
Ziel der Erfindung ist es einerseits, die Meßfehler bei frei gespannten Bandmeßsystemen zu verringern und andererseits den konstruktiven und fertigungstechnischen Aufwand zur Lagefixierung des flexiblen Teilungsträgers zu reduzieren und darüber hinaus die Lebensdauer und Zuverlässigkeit der Meßsysteme zu erhöhen.The aim of the invention is on the one hand to reduce the measurement errors in free-tension Bandmeßsystemen and on the other hand to reduce the design and manufacturing effort to fix the position of the flexible graduation carrier and beyond to increase the life and reliability of the measuring systems.
Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung zur Lagefixierung eines flexiblen Teilungsträgers zi· entwickeln, welche stets einen fest votgegebenen Lageberelch zwischen Abtastelement und Maßverkörperung sichert, welche bei der Relativbewegung zwischen Teilungsträger und Abtastelement die Längskräfte auf den Teilungsträger reduziert, welche Schwingungen des Teilungsträgers so dämpft, daß sie nur geringe Meßunsicherheiten verursachen, und welche den Verschleiß am Teilungsträger wesentlich reduziert.The invention is based on the object of developing an arrangement for fixing the position of a flexible graduation carrier, which always ensures a fixed position between the scanning element and the material measure, which reduces the longitudinal forces on the graduation carrier during the relative movement between the graduation carrier and the scanning element, thus determining the oscillations of the graduation carrier dampens that they cause only small Meßunsicherheiten, and which significantly reduces wear on the graduation carrier.
Erfindungsgemäß ergibt sich die Lösung dieser Aufgabe dadurch, daß bei einer Anordnung zur Lagefixierung ein bandförmiger elastischer Teilungsträger, der unter hoher Vorspannkraft an einem Maschinenbett fest eingespannt ist, mit einer fremdgeführten Abtasteinrichtung abgetastet wird und daß der Teilungsträger und damit auch die abzutastende Teilung der Abtasteinrichtung zwangsweise zugeordnet ist. Diese Zuordnung erfolgt mittels unter Luftdruck stehenden Gruppen von Düsenpaaren, wobei die Einzeldüsen eines Einzeldüsenpaares sich bezüglich der Abtastrichtung auf beiden Seiten des Teilungsträgers befinden und gegenüberstehen. Mindestens eine Einzeldüse des Düsenpaares ist in Abtastrichtung beweglich angeordnet und wird mittels eines krafterzeugenden Elementes, einer Feder oder eines pneumatischen Druckkolbens, in Richtung der anderen Düse gedrückt, wobei diese Bewegungsmöglichkeit in Richtung der anderen Düsen durch einen Anschlag begrenzt wird. Für die Erzeugung hinreichender Kräfte zur Lagestabilisierung des Teilungsträgers in den Düsenpaaren sind sehr kleine Luftspalte erforderlich, die schon in der Dickentoleranz des Teilungsträgers liegen. Durch die bewegliche Düse und das Kräftegleichgewicht der beweglichen Düse zwischen der Druckluft im Düsenpaar und dem krafterzeugenden Element wird annähernd der Luftspalt trotz Dickenschwankungen des Teilungsträgers konstantgehalten. Der feste Anschlag ist so angeordnet, daß bei fehlender Druckluft die bewegliche Düse nicht gegen den Teilungsträger gedrückt werden kann. Die Kraft des krafterzeugenden Elementes kann aber auch so eingestellt werden, daß die bewegliche Düse erst vom Anschlag abhebt, wenn die Teilungsträgerdicke so groß wird, daß ein kritischer minimaler Luftspalt erreicht wird. Diese Anordnung gewährleistet eine hohe Lagestabilisierung des Teilungsträge! s für die Zwangsführung des Teilungsträgers zur Abtasteinrichtung, ohne daß auf den Teilungsträger Kräfte in Meßrichtung eingeleitet werden. Da keine Berührung zwischen Abtasteinrichtung und Teilungsträger vorliegt, arbeitet diese Zwangsführung auch verschleißfrei.According to the invention, the solution of this task results from the fact that in a position fixing arrangement a band-shaped elastic graduation carrier, which is firmly clamped under high biasing force on a machine bed is scanned with a foreign-guided scanning and that the graduation carrier and thus the scanned division of the scanning forcibly assigned. This assignment is carried out by means of air-pressure groups of nozzle pairs, wherein the individual nozzles of a single nozzle pair are located with respect to the scanning direction on both sides of the graduation carrier and face each other. At least one individual nozzle of the nozzle pair is arranged to be movable in the scanning direction and is pressed by means of a force-generating element, a spring or a pneumatic pressure piston in the direction of the other nozzle, this movement possibility is limited in the direction of the other nozzle by a stop. For generating sufficient forces to stabilize the position of the graduation carrier in the nozzle pairs very small air gaps are required, which are already in the thickness tolerance of the graduation carrier. Due to the movable nozzle and the force balance of the movable nozzle between the compressed air in the nozzle pair and the force-generating element, the air gap is approximately kept constant despite thickness variations of the graduation carrier. The fixed stop is arranged so that in the absence of compressed air, the movable nozzle can not be pressed against the graduation carrier. However, the force of the force-generating element can also be adjusted so that the movable nozzle does not lift off the stop until the graduation carrier thickness becomes so great that a critical minimum air gap is achieved. This arrangement ensures a high position stabilization of the Teilungssträge! s for the positive guidance of the graduation carrier to the scanning without forces are introduced to the graduation carrier in the direction of measurement. Since there is no contact between scanning device and graduation carrier, this forced operation also works wear-free.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch dargestellt. Fig. 1 zeigt eine Schnittdarstellung der Ausführung im Idealzustand.In the drawing, an embodiment of the invention is shown schematically. Fig. 1 shows a sectional view of the embodiment in the ideal state.
Ein elastischer Teilungsträger 1 mit der Dicke D ist unter Vorspannkraft fest an einem Maschinenelement 2 eingespannt. An einem Maschinenelement 3, welches zum Maschinenelement 2 in Meßrichtung 4 relativ beweglich ist, ist eine Abtasteinrichtung 5 starr angekoppelt.An elastic division carrier 1 with the thickness D is firmly clamped under pretensioning force on a machine element 2. On a machine element 3, which is relatively movable to the machine element 2 in the measuring direction 4, a scanning device 5 is rigidly coupled.
Durch ein Düsenpaar, aus Einzeldüsen 6 und 7 bestehend, wird mittels einer Druckkraft mit dem Druck p, in sehr kleinen Luftspalten 8 und 9 eine Kraft zwischen dem Teilungsträger 1 und den Einzeldüsen 6,7 erzeugt, welche den Teilungsträger 1, bezogen auf das Düsenpaar, in einer stabilen Lage hält. Die in Abtastrichtung 10 bewegliche Einzeldüse 7, die, bezogen auf den Teilungsträger 1 der feststehenden Düse 6, gegenüber angeordnet ist, wird durch eine Feder 11 gegen einen Anschlag 12 gedrückt. Dieser Anschlag gibt die Grundluftspaltabstände 8 und 9 vor. Die Feder 11 ist so ausgelegt, daß die bewegliche Einzeldüse 7 erst vom Anschlag 12 abhebt, wenn die Teilungsträgerdicke D so groß wird, daß ein kritischer minimaler Luftspalt erreicht wird. Dadurch wird verhindert, daß bei Überschreitung von Dickentoleranzen des Teilungsträgers 1 eine Berührung von Teilungsträger 1 und Einzeldüsen 6,7 auftreten kann.By a pair of nozzles, consisting of individual nozzles 6 and 7, a force between the graduation carrier 1 and the individual nozzles 6.7 is generated by means of a pressure force with the pressure p, in very small air gaps 8 and 9, which the graduation carrier 1, based on the nozzle pair , keeps in a stable position. The movable in the scanning direction 10 individual nozzle 7, which, based on the graduation carrier 1 of the fixed nozzle 6, opposite, is pressed by a spring 11 against a stop 12. This stop specifies the basic air gap distances 8 and 9. The spring 11 is designed so that the movable single nozzle 7 does not lift off the stop 12 until the graduation carrier thickness D becomes so great that a critical minimum air gap is reached. This prevents that when exceeding thickness tolerances of the graduation carrier 1, a touch of graduation carrier 1 and individual nozzles 6,7 may occur.
Claims (4)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD90343321A DD297233A5 (en) | 1990-08-08 | 1990-08-08 | ARRANGEMENT FOR POSITION FIXING OF A FLEXIBLE DIVISION OF A LENGTH MEASUREMENT SYSTEM ON A MACHINE |
PCT/EP1991/001507 WO1992002781A1 (en) | 1990-08-08 | 1991-08-08 | Arrangement for positioning a flexible division carrier of a length-measuring system on a machine |
EP91914557A EP0495063B1 (en) | 1990-08-08 | 1991-08-08 | Arrangement for positioning a flexible division carrier of a length-measuring system on a machine |
DE59104153T DE59104153D1 (en) | 1990-08-08 | 1991-08-08 | ARRANGEMENT FOR FIXING THE POSITION OF A FLEXIBLE DIVISION BRACKET OF A LENGTH MEASURING SYSTEM ON A MACHINE. |
AT91914557T ATE116738T1 (en) | 1990-08-08 | 1991-08-08 | ARRANGEMENT FOR FIXING THE POSITION OF A FLEXIBLE DIVISION CARRIER OF A LENGTH MEASURING SYSTEM ON A MACHINE. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD90343321A DD297233A5 (en) | 1990-08-08 | 1990-08-08 | ARRANGEMENT FOR POSITION FIXING OF A FLEXIBLE DIVISION OF A LENGTH MEASUREMENT SYSTEM ON A MACHINE |
Publications (1)
Publication Number | Publication Date |
---|---|
DD297233A5 true DD297233A5 (en) | 1992-01-02 |
Family
ID=5620182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DD90343321A DD297233A5 (en) | 1990-08-08 | 1990-08-08 | ARRANGEMENT FOR POSITION FIXING OF A FLEXIBLE DIVISION OF A LENGTH MEASUREMENT SYSTEM ON A MACHINE |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0495063B1 (en) |
AT (1) | ATE116738T1 (en) |
DD (1) | DD297233A5 (en) |
DE (1) | DE59104153D1 (en) |
WO (1) | WO1992002781A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19922363A1 (en) * | 1999-05-14 | 2000-11-23 | Rexroth Star Gmbh | Device for determining the relative position of two bodies movable relative to one another and method for producing such a device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5406715A (en) * | 1992-07-07 | 1995-04-18 | Mitutoyo Corporation | Tape measure device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3533703A (en) * | 1966-06-23 | 1970-10-13 | Itek Corp | Linear motion encoder |
IT1152526B (en) * | 1982-09-03 | 1987-01-07 | Giacomo Giacomello | METALLIC BELT TRANSDUCES FOR MICROMETRIC MEASUREMENTS OF LINEAR SIZES |
US4786803A (en) * | 1987-06-01 | 1988-11-22 | Hewlett-Packard Company | Single channel encoder with specific scale support structure |
-
1990
- 1990-08-08 DD DD90343321A patent/DD297233A5/en not_active IP Right Cessation
-
1991
- 1991-08-08 WO PCT/EP1991/001507 patent/WO1992002781A1/en active IP Right Grant
- 1991-08-08 AT AT91914557T patent/ATE116738T1/en not_active IP Right Cessation
- 1991-08-08 EP EP91914557A patent/EP0495063B1/en not_active Expired - Lifetime
- 1991-08-08 DE DE59104153T patent/DE59104153D1/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19922363A1 (en) * | 1999-05-14 | 2000-11-23 | Rexroth Star Gmbh | Device for determining the relative position of two bodies movable relative to one another and method for producing such a device |
Also Published As
Publication number | Publication date |
---|---|
EP0495063B1 (en) | 1995-01-04 |
ATE116738T1 (en) | 1995-01-15 |
EP0495063A1 (en) | 1992-07-22 |
WO1992002781A1 (en) | 1992-02-20 |
DE59104153D1 (en) | 1995-02-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NPI | Change in the person, name or address of the patentee (addendum to changes before extension act) | ||
ENJ | Ceased due to non-payment of renewal fee |