GB2136573A - Measuring head - Google Patents

Measuring head Download PDF

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Publication number
GB2136573A
GB2136573A GB08406688A GB8406688A GB2136573A GB 2136573 A GB2136573 A GB 2136573A GB 08406688 A GB08406688 A GB 08406688A GB 8406688 A GB8406688 A GB 8406688A GB 2136573 A GB2136573 A GB 2136573A
Authority
GB
United Kingdom
Prior art keywords
follower
deflection
follower head
sensor
measuring
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Withdrawn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
GB08406688A
Other versions
GB8406688D0 (en
Inventor
Otto Klingler
Kurt Linder
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.)
Mauser Werke Oberndorf GmbH
Original Assignee
Mauser Werke Oberndorf 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 Mauser Werke Oberndorf GmbH filed Critical Mauser Werke Oberndorf GmbH
Publication of GB8406688D0 publication Critical patent/GB8406688D0/en
Publication of GB2136573A publication Critical patent/GB2136573A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/045—Correction of measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/002—Details
    • G01B3/008—Arrangements for controlling the measuring force

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)
  • Facsimiles In General (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

The head has a casing 1, to which a follower member 4 mounting an integrated sensor 3 is attached via an optional exchangeable extension member 2. With this construction a signal recognition close to the following operation takes place despite a large admissible deflection movement of the deflection mechanism. <IMAGE>

Description

SPECIFICATION Follower head for measuring devices The invention relates to a follower head for measuring devices with a deflection mechanism incorporated in a follower head casing, to which mechanism an external follower member is connected.
Follower heads of the aforementioned type are known generally and are used for example in measuring devices. Measuring devices of this type may be both measuring machines as well as processing machines, which are equipped with measuring stations. These generally known follower heads comprise a follower member, which inside the follower head casing is connected to a deflection mechanism and a sensor for producing a measurement signal, so that when the follower head approaches an object to be measured, the follower member is given the possibilty of deflection after overcoming a certain following force. The follower heads of the known type are well suited to measuring points located close to the follower head.In the case of measuring points located at a distance, for example in the case of depth measurements, followear heads of this type have the drawback that measurements can be carried out solely by way of a correspondingly long follower member. However, these follower members of different lengths cause unequal deflection relationshps in the deflection mechanism and the sensor located in the follower head casing, which jeopardizes the quality of the measurement result.
In order to obviate this drawback, follower heads with a long follower member are also already known. On account of their large outer diameter, these follower heads above all have the drawback that it is not possible to measure relatively small bores with the latter.
It is therefore the object of the invention to provide a follower head of the aforementioned type, which without jeopardizing the quality of the measurement results can be used for following operations at varying distances from the follower head casing.
This object is achieved according to the invention due to the fact that a sensor is integrated in the follower member, which sensor is constructed as a separate component with respect to the follower head casing. In this case, the follower member integrated with the sensor can be attached directly to the follower head casing. In a further embodiment of the invention, it can likewise also be located on an extension member extending from the follower head casing.
Furthermore, for recognizing the following direction, the follower member with the sensor may be provided with mechanical and/or electrical devices, which are operative in the three co-ordinate directions. In a preferred embodiment, these devices for recognizing the following direction may be resistance strain gauges.
Furthermore, the measuring force may be adjustable and independent of the deflection mechanism of the selectively used extension member and the deflection forces.
The particular advantage of the invention lies in the movement-free signal recognition close to the following operation, which is possible despite a large admissible deflection movement of the deflec tion mechanism. Accordingly, starting from the follower head casing, any extensions are possible without the following relationships being varied.
When using the solution according to the inven tion, the measuring forces are no longer dependent on the deflection mechanism and the extension members used or the deflection forces, but are determined solely by the adjustable sensitivity of the follower sensors.
An example of the invention is illustrated in the drawings, in which: Figure 1 shows a follower head diagrammatically, Figure 2 shows a characteristic of the deflection mechanism with working points of the sensor for the emission of the measurement signal.
Attached centrally to the follower head casing 1 of the follower head according to the invention is an extension member 2, at the front end of which the follower member 4 with the integrated sensor 3 is located. At its free end the follower member 4 supports a follower ball 5 for following on an object to be measured. Instead of the ball illustrated, other geometric members can also be chosen to match the measuring task to be fulfilled. The extension mem ber 2 can be exchanged at will for any other extension members of different lengths. With measuring points of a component located close to the follower head casing 1, the extension member 2 may even be completely dispensed with for exam ple. The sensor which is outside the follower head casing 1 is in this case located directly with the follower member 4 on the follower head casing 1.
The sensor 3 is located in the casing of the follower member 4, which is in operative connection with the resistance strain gauges 6 in the three co-ordinate directions. Recognition of the following direction is possible by the resistance strain gauges used. If a certain force is exceeded, the follower member 4 is deflected as a result of the deflection mechanism incorporated in the follower head casing.
Figure 2 shows the characteristic of the deflection force of the deflection mechanism as a function of the deflection travel. Thus, the deflection force is plotted on the axis "F" and the deflection travel on the axis "S". The regions A1 and A2 form the range of adjustment of the measuring force, since the rigid region is over this region between the points 7 and 8.
The beginning of the upper deflection force is shown at 9 and the beginning of the lower deflection force at 10.
1. Follower head for measuring devices with a deflection mechanism incorporated in a follower head casing, to which an external follower member is connected, wherein integrated in the follower member is a sensor, which is constructed as a separate component from the follower head casing.
2. Follower head according to claim 1, wherein
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Follower head for measuring devices The invention relates to a follower head for measuring devices with a deflection mechanism incorporated in a follower head casing, to which mechanism an external follower member is connected. Follower heads of the aforementioned type are known generally and are used for example in measuring devices. Measuring devices of this type may be both measuring machines as well as processing machines, which are equipped with measuring stations. These generally known follower heads comprise a follower member, which inside the follower head casing is connected to a deflection mechanism and a sensor for producing a measurement signal, so that when the follower head approaches an object to be measured, the follower member is given the possibilty of deflection after overcoming a certain following force. The follower heads of the known type are well suited to measuring points located close to the follower head.In the case of measuring points located at a distance, for example in the case of depth measurements, followear heads of this type have the drawback that measurements can be carried out solely by way of a correspondingly long follower member. However, these follower members of different lengths cause unequal deflection relationshps in the deflection mechanism and the sensor located in the follower head casing, which jeopardizes the quality of the measurement result. In order to obviate this drawback, follower heads with a long follower member are also already known. On account of their large outer diameter, these follower heads above all have the drawback that it is not possible to measure relatively small bores with the latter. It is therefore the object of the invention to provide a follower head of the aforementioned type, which without jeopardizing the quality of the measurement results can be used for following operations at varying distances from the follower head casing. This object is achieved according to the invention due to the fact that a sensor is integrated in the follower member, which sensor is constructed as a separate component with respect to the follower head casing. In this case, the follower member integrated with the sensor can be attached directly to the follower head casing. In a further embodiment of the invention, it can likewise also be located on an extension member extending from the follower head casing. Furthermore, for recognizing the following direction, the follower member with the sensor may be provided with mechanical and/or electrical devices, which are operative in the three co-ordinate directions. In a preferred embodiment, these devices for recognizing the following direction may be resistance strain gauges. Furthermore, the measuring force may be adjustable and independent of the deflection mechanism of the selectively used extension member and the deflection forces. The particular advantage of the invention lies in the movement-free signal recognition close to the following operation, which is possible despite a large admissible deflection movement of the deflec tion mechanism. Accordingly, starting from the follower head casing, any extensions are possible without the following relationships being varied. When using the solution according to the inven tion, the measuring forces are no longer dependent on the deflection mechanism and the extension members used or the deflection forces, but are determined solely by the adjustable sensitivity of the follower sensors. An example of the invention is illustrated in the drawings, in which: Figure 1 shows a follower head diagrammatically, Figure 2 shows a characteristic of the deflection mechanism with working points of the sensor for the emission of the measurement signal. Attached centrally to the follower head casing 1 of the follower head according to the invention is an extension member 2, at the front end of which the follower member 4 with the integrated sensor 3 is located. At its free end the follower member 4 supports a follower ball 5 for following on an object to be measured. Instead of the ball illustrated, other geometric members can also be chosen to match the measuring task to be fulfilled. The extension mem ber 2 can be exchanged at will for any other extension members of different lengths. With measuring points of a component located close to the follower head casing 1, the extension member 2 may even be completely dispensed with for exam ple. The sensor which is outside the follower head casing 1 is in this case located directly with the follower member 4 on the follower head casing 1. The sensor 3 is located in the casing of the follower member 4, which is in operative connection with the resistance strain gauges 6 in the three co-ordinate directions. Recognition of the following direction is possible by the resistance strain gauges used. If a certain force is exceeded, the follower member 4 is deflected as a result of the deflection mechanism incorporated in the follower head casing. Figure 2 shows the characteristic of the deflection force of the deflection mechanism as a function of the deflection travel. Thus, the deflection force is plotted on the axis "F" and the deflection travel on the axis "S". The regions A1 and A2 form the range of adjustment of the measuring force, since the rigid region is over this region between the points 7 and 8. The beginning of the upper deflection force is shown at 9 and the beginning of the lower deflection force at 10. CLAIMS
1. Follower head for measuring devices with a deflection mechanism incorporated in a follower head casing, to which an external follower member is connected, wherein integrated in the follower member is a sensor, which is constructed as a separate component from the follower head casing.
2. Follower head according to claim 1, wherein the follower member with the sensor is arranged on an extension member starting from the follower head casing.
3. Follower head according to claim 1 or 2, wherein the follower member with the sensor is provided with mechanical and/or electrical devices for recognizing the following direction, which devices are operative in the three co-ordinate directions.
4. Follower head according to claim 3, wherein the devices for recognizing the following direction are resistance strain gauges.
5. Follower head according to any one of claims 1 to 4 wherein the measuring force is adjustable and independent of the deflection mechanism of the extension member used selectively and the deflection forces.
6. Follower head for measuring devices substan tialiy as hereinbefore described with reference to the accompanying drawings.
GB08406688A 1983-03-15 1984-03-14 Measuring head Withdrawn GB2136573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3309122A DE3309122A1 (en) 1983-03-15 1983-03-15 PROBE HEAD FOR MEASURING DEVICES

Publications (2)

Publication Number Publication Date
GB8406688D0 GB8406688D0 (en) 1984-04-18
GB2136573A true GB2136573A (en) 1984-09-19

Family

ID=6193452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08406688A Withdrawn GB2136573A (en) 1983-03-15 1984-03-14 Measuring head

Country Status (5)

Country Link
JP (1) JPS59174710A (en)
DE (1) DE3309122A1 (en)
GB (1) GB2136573A (en)
IT (2) IT1175429B (en)
SE (1) SE8401140L (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989011631A1 (en) * 1988-05-27 1989-11-30 Renishaw Plc Test bar for position determination apparatus
US4916825A (en) * 1987-08-27 1990-04-17 Carl-Zeiss-Stittung Work-contacting probe system for a coordinate-measuring instrument
US4958438A (en) * 1989-03-30 1990-09-25 The Warner & Swasey Company Rotary table for a coordinate measuring machine and method of determining the axis of table rotation
EP0420416A2 (en) * 1989-09-09 1991-04-03 Renishaw plc Method and apparatus of datuming a coordinate positioning machine
US5040306A (en) * 1988-02-18 1991-08-20 Renishaw Plc Surface-sensing device
EP0471371A2 (en) * 1990-08-17 1992-02-19 Kabushiki Kaisha Toshiba Displacement-measuring apparatus
US5152072A (en) * 1988-02-18 1992-10-06 Renishaw Plc Surface-sensing device
US5189806A (en) * 1988-12-19 1993-03-02 Renishaw Plc Method of and apparatus for scanning the surface of a workpiece
US5212646A (en) * 1987-12-19 1993-05-18 Renishaw Plc Method of using a mounting for surface-sensing stylus
US5884410A (en) * 1995-12-21 1999-03-23 Carl-Zeiss-Stiftung Sensing system for coordinate measuring equipment

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604526A1 (en) * 1986-02-13 1987-08-20 Kurt Kern Gmbh & Co Kg Device for spatially scanning objects
GB8908854D0 (en) * 1989-04-19 1989-06-07 Renishaw Plc Method of and apparatus for scanning the surface of a workpiece
JP3273026B2 (en) * 1998-09-02 2002-04-08 株式会社ミツトヨ Surface tracking type measuring machine

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568800A (en) * 1943-05-13 1945-04-20 Kapella Ltd Improvements in or relating to apparatus for measuring or indicating the roughnessesor undulations of a surface
GB594308A (en) * 1944-12-21 1947-11-07 Ronald Graham Chalmers Improvements in or relating to apparatus for indicating or measuring small dimensions
GB628400A (en) * 1945-10-18 1949-08-29 Arnold Weisselberg Improvements relating to electrical gauging devices
GB730316A (en) * 1952-01-15 1955-05-18 Centre Nat Rech Scient Improvements in or relating to electric precision comparators
GB1358220A (en) * 1971-10-08 1974-07-03 Hoffman Gmbh Gebr Hofmann Kg G Measuring and indicating apparatus
GB1487213A (en) * 1973-10-25 1977-09-28 Finike Italiana Marposs Direct feeling gauge
GB2009409A (en) * 1977-12-03 1979-06-13 Beecham Group Ltd Measuring and recording surface profile
GB2019576A (en) * 1978-03-23 1979-10-31 Fujitsu Fanuc Ltd Tracer head adjustment
GB2049198A (en) * 1979-05-01 1980-12-17 Renishaw Electrical Ltd Probe for use in measuring apparatus
GB2065886A (en) * 1979-12-21 1981-07-01 Ecole Polytech Extensometer
GB2079460A (en) * 1980-06-04 1982-01-20 British Steel Corp Caliper gauges

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
DE1295199B (en) * 1963-03-01 1969-05-14 Portage Machine Company Measuring machine for checking the dimensional accuracy of workpieces
DE1573731A1 (en) * 1966-08-29 1970-05-21 Nii Osnowanij I Podsemnych Soo Measuring device for determining deformations in solid rock
DE1804253A1 (en) * 1968-10-21 1970-06-25 Wolfram Pahl Two-coordinate dial indicator
DE2242355C2 (en) * 1972-08-29 1974-10-17 Fa. Carl Zeiss, 7920 Heidenheim Electronic multi-coordinate probe
JPS5340465B2 (en) * 1973-07-31 1978-10-27
CH563009A5 (en) * 1973-09-14 1975-06-13 Maag Zahnraeder & Maschinen Ag
GB1551218A (en) * 1975-05-13 1979-08-22 Rolls Royce Probe for use in displacement measuring apparatus
CH628137A5 (en) * 1977-09-27 1982-02-15 Meseltron Sa MEASURING METHOD USING A MEASURING HEAD OF A MEASURING MACHINE AND MEASURING HEAD FOR CARRYING OUT THIS METHOD.
SU1095065A2 (en) * 1979-11-05 1984-05-30 Вильнюсский Филиал Экспериментального Научно-Исследовательского Института Металлорежущих Станков Measuring head

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568800A (en) * 1943-05-13 1945-04-20 Kapella Ltd Improvements in or relating to apparatus for measuring or indicating the roughnessesor undulations of a surface
GB594308A (en) * 1944-12-21 1947-11-07 Ronald Graham Chalmers Improvements in or relating to apparatus for indicating or measuring small dimensions
GB628400A (en) * 1945-10-18 1949-08-29 Arnold Weisselberg Improvements relating to electrical gauging devices
GB730316A (en) * 1952-01-15 1955-05-18 Centre Nat Rech Scient Improvements in or relating to electric precision comparators
GB1358220A (en) * 1971-10-08 1974-07-03 Hoffman Gmbh Gebr Hofmann Kg G Measuring and indicating apparatus
GB1487213A (en) * 1973-10-25 1977-09-28 Finike Italiana Marposs Direct feeling gauge
GB2009409A (en) * 1977-12-03 1979-06-13 Beecham Group Ltd Measuring and recording surface profile
GB2019576A (en) * 1978-03-23 1979-10-31 Fujitsu Fanuc Ltd Tracer head adjustment
GB2049198A (en) * 1979-05-01 1980-12-17 Renishaw Electrical Ltd Probe for use in measuring apparatus
GB2065886A (en) * 1979-12-21 1981-07-01 Ecole Polytech Extensometer
GB2079460A (en) * 1980-06-04 1982-01-20 British Steel Corp Caliper gauges

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5024003A (en) * 1987-08-27 1991-06-18 Carl-Zeiss-Stiftung, Heidenheim/Brenz Work-contacting probe system for a coordinate-measuring instrument
US4916825A (en) * 1987-08-27 1990-04-17 Carl-Zeiss-Stittung Work-contacting probe system for a coordinate-measuring instrument
US5212646A (en) * 1987-12-19 1993-05-18 Renishaw Plc Method of using a mounting for surface-sensing stylus
US5152072A (en) * 1988-02-18 1992-10-06 Renishaw Plc Surface-sensing device
US5040306A (en) * 1988-02-18 1991-08-20 Renishaw Plc Surface-sensing device
WO1989011631A1 (en) * 1988-05-27 1989-11-30 Renishaw Plc Test bar for position determination apparatus
US5189806A (en) * 1988-12-19 1993-03-02 Renishaw Plc Method of and apparatus for scanning the surface of a workpiece
US4958438A (en) * 1989-03-30 1990-09-25 The Warner & Swasey Company Rotary table for a coordinate measuring machine and method of determining the axis of table rotation
EP0420416A3 (en) * 1989-09-09 1991-04-17 Renishaw Plc Method and apparatus of datuming a coordinate positioning machine
EP0420416A2 (en) * 1989-09-09 1991-04-03 Renishaw plc Method and apparatus of datuming a coordinate positioning machine
EP0471371A2 (en) * 1990-08-17 1992-02-19 Kabushiki Kaisha Toshiba Displacement-measuring apparatus
EP0471371A3 (en) * 1990-08-17 1992-09-23 Kabushiki Kaisha Toshiba Displacement-measuring apparatus, and static-pressure bearing device for use in the displacement-measuring apparatus
US5174039A (en) * 1990-08-17 1992-12-29 Kabushiki Kaisha Toshiba Displacement-measuring apparatus, and static-pressure bearing device for use in the displacement-measuring apparatus
US5884410A (en) * 1995-12-21 1999-03-23 Carl-Zeiss-Stiftung Sensing system for coordinate measuring equipment

Also Published As

Publication number Publication date
IT8419923A0 (en) 1984-03-06
SE8401140D0 (en) 1984-03-01
IT1175429B (en) 1987-07-01
JPS59174710A (en) 1984-10-03
DE3309122A1 (en) 1984-09-20
SE8401140L (en) 1984-09-16
IT8421138V0 (en) 1984-03-06
GB8406688D0 (en) 1984-04-18

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)