WO2008010492A1 - Détecteur de contact - Google Patents
Détecteur de contact Download PDFInfo
- Publication number
- WO2008010492A1 WO2008010492A1 PCT/JP2007/064100 JP2007064100W WO2008010492A1 WO 2008010492 A1 WO2008010492 A1 WO 2008010492A1 JP 2007064100 W JP2007064100 W JP 2007064100W WO 2008010492 A1 WO2008010492 A1 WO 2008010492A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ball
- support member
- contact
- detection needle
- balls
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/004—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points
- G01B5/008—Measuring arrangements characterised by the use of mechanical techniques for measuring coordinates of points using coordinate measuring machines
- G01B5/012—Contact-making feeler heads therefor
- G01B5/016—Constructional details of contacts
Definitions
- the present invention relates to an apparatus for detecting contact between a detection end of a detection needle and a detection target, and the detection needle is provided with a return spring at a stable position defined by six support points provided in the housing. It is related with the said apparatus of the structure supported in the pressed state.
- the present invention relates to a technique for preventing an error in the position of the support point caused by a temperature change or a secular change and adversely affecting the detection accuracy of a contact detector.
- This type of contact detector includes a detection needle provided at the tip with a detection end to be brought into contact with an object to be detected, and a housing that supports the detection needle.
- the base of the detection needle that is, the end opposite to the detection end is pressed against the six support points formed on the support member in the housing by a return spring built in the housing.
- the detection needle In the state where an external force is applied to the detection end, the detection needle is held at a stable position in the three-dimensional space defined by the six support points.
- the contact reaction force slightly tilts the detection needle from its stable position, and at least one of the six support points is separated (separated). .
- the contact between the detection end and the detection target is detected.
- such a contact detector is provided with a shank 22 in a housing 21, and this shank is mounted on a tool shaft 23 of a machine tool so that the relative position between the tool shaft and the workpiece 24.
- the contact detector 20 is mounted on the tool axis 23 of a machine tool in which the workpiece 24 to be detected is fixed on the table 25, and the tool axis 23 or the table 25 is moved by an NC device (not shown). Then, the relative position relationship between the tool axis and the workpiece is measured by reading the coordinate of the tool axis or the table when the contact signal between the detection end 13 of the detection needle 1 and the workpiece 24 is output from the contact detector.
- the housing 21 incorporates the support member 4 having the six support points and the return spring 16.
- the support member 4 is fixed to the housing 21 via the adjustment screw 26, and the adjustment screw 26 is adjusted.
- the position of the detection end 13 at the stable position is set on the same axis as the central axis of the shank 22.
- FIGS. This structure is illustrated in FIGS. As shown in the figure, three support legs 3 are provided in the radial direction at intervals of 120 degrees on the base 2 of the detection needle 1 having the tip 13 as the detection end.
- the support leg 3 is a cylinder.
- three receiving portions 15 are formed with a total of six balls 5 in pairs, at each vertex position of an equilateral triangle centering on the axis of the detection needle 1.
- the receiving portion 15 is formed in a recessed portion between the two balls 5.
- each support leg 3 is supported by the receiving portion 15 opposed to the support leg 3.
- the three support legs 3 are in contact with the spherical surfaces of the two balls that support each of them, so that six support points 10 are formed, and the stable position of the detection needle 1 is defined by these six support points. .
- the detection end 13 of the detection needle has a position in the three-axis direction in the three-dimensional space and a rotation angle around the three axes. Defined by support point 10.
- the detection end 13 slightly moves due to the contact between the detection end 13 and the detection target, the detection needle 1 is slightly tilted, and the contact between the ball 5 and the support leg 3 is released at any one of the support points 10.
- the detection end 13 always returns to a certain stable position by the spring force of the return spring 16.
- the contact between the detection needle and the detection target can be detected by an electric circuit using the contact point between the surface of the detection target and the detection needle as an external contact.
- an electrical defective conductor is included in the object to be detected, it can be detected by an electric circuit having the ball 5 and the support point 10 of the support leg 3 as internal contacts.
- the internal contact can be formed by providing an electric circuit 17 that connects six support points 10 of the support leg 3 and the ball 5 in series. Yes due to deviation of the detection needle 1 from the stable position. The contact between the support leg 3 and the ball 5 is released at a certain support point 10, and this separation is detected as an electric signal (ON / OFF of the electric circuit 17).
- FIG. 7 is a view showing an example of a specific structure for fixing the ball 5 to the support member 4.
- a hollow cylindrical support member 4 having a center hole 14 through which a detection needle passes is provided with a storage hole 6 for receiving a ball 5 by a ball end mill, and a support leg 3 is inserted between adjacent storage holes.
- the direction slit 7 is covered.
- the width of the slit 7 is sufficiently wider than the diameter of the support leg 3.
- the bottom surface of the storage hole opened by the ball end mill is a hemispherical receiving surface, and the ball 5 is fixed to the receiving surface with an adhesive.
- the balls 5 and the support legs 3 that are round bars can be processed with high accuracy.
- errors are likely to occur in the depth of the storage hole 6 and the mounting angle of the support leg 3.
- the position error of the detection end 13 caused by this error can be corrected by initially adjusting the two-dimensional tilt of the support member 4 in the housing for each detector.
- Patent Document 1 Japanese Patent Laid-Open No. 11-94509
- the position of the ball also deviates from the initial position force, and a large error occurs in the stable position of the detection end 13.
- a slight displacement of the ball 5 causes a large displacement in the stable position of the detection end 13, and the measurement accuracy is greatly reduced.
- An object of the present invention is to provide a detection needle support structure that solves the above-described problem and does not cause secular change in the stable position of the tip of the detection needle even in an environment where temperature changes are severe. is there. As a result, it is possible to obtain a contact detector capable of measuring with higher accuracy and having a longer product life.
- the present invention solves the above-mentioned problem by providing a simple structure in which a ball supporting a detection needle of a contact detector is fixed in direct contact with the support member 4.
- the contact detector of the present invention includes a detection needle 1 having a detection end to be brought into contact with a detection target, three support legs 3 extending in a radial direction from the base 2 of the detection needle, and each support leg.
- the ball 5 forming the receiving portion 15 is positioned by the hemispherical or conical receiving surface 12 at the bottom of the storage hole 6 formed in the support member 4.
- the support member 4 is provided with screw holes 8 from the outer periphery toward each of the six balls 5.
- Each of the screw holes is screwed with a screw 9 that presses the ball 5 against the receiving surface 12 at the bottom of the storage hole 6 provided in the support member 4.
- the storage provided in the support member 4 to store each ball 5 without the adhesive layer interposed by pressing each ball 5 against the receiving surface 12 at the bottom of the storage hole with the screw 9 It is fixed in place while in direct contact with the receiving surface 12 of the hole.
- the screw hole 8 can be provided in a direction in which the ball 5 is pressed against the receiving surface 12 at the bottom of the storage hole.
- the screw hole 8 can also be provided in a direction orthogonal to the direction in which the ball 5 is pressed. In the latter case, a screw 9 having a convex conical surface 11 at the tip is used.
- the tip of the screw 9 presses and fixes the ball 5 directly to the receiving surface 12 at the bottom of each storage hole.
- the support leg 3 and the ball 5 are formed of a conductor, and the base 2 and the support member 4 of the detection needle are Insulator.
- the entire detection needle, the support leg, the ball, and the support member 4 are made conductive so that the internal electrical wiring can be made unnecessary.
- the legs 3 do not have to be equiangularly spaced from or around the force axis formed at intervals of 120 degrees in the radial direction around the axis of the detection needle 1.
- the ball 5 defining the stable position of the detection needle is fixed to the support member 4 by pressing directly, that is, without interposing an adhesive layer or the like. There is almost no possibility that the position of the ball 5 will change due to aging. Therefore, it is possible to maintain the accuracy of the stable position of the detection needle 1 over a long period of time, and to provide a contact detector capable of detecting contact with higher accuracy and having a long life.
- the ball fixing structure is a reasonable and simple structure adapted to the shape and structure of the receiving portion 15 that supports the detection needle.
- the screw hole 8 is formed in the support member 4 from the side surface and the screw is fixed. Since the screw 9 is screwed into the hole or only the spring insertion hole 18 is opened from the side surface of the support member 4 and the spring 19 is inserted into the spring insertion hole, the manufacturing is very simple.
- the ball 5 is fixed to the receiving surface 12 at the bottom of the ball receiving hole by the double wedge action of the screw and the conical surface. And ball 5 can be fixed.
- FIG. 1 is a plan view showing a main part of one embodiment of the present invention.
- FIG. 3 Sectional view taken along line AA in Fig. 1 showing a second structure different from Fig. 2
- FIG. 4 is a cross-sectional view taken along line A—A in FIG. 1, showing a third structure different from FIGS.
- FIG. 5 is a perspective view showing an example of a conventional contact detector.
- FIG. 6 is a plan view showing the main part of the contact detector of FIG.
- FIG. 7 is a sectional view showing a support structure of a support leg of the contact detector of FIG.
- FIG. 8 is a schematic diagram showing an example of a contact detection circuit.
- FIG.9 Schematic diagram showing an example of using a position detector
- the support structure of the detection needle 1 is a set of two pieces in which three support legs 3 extending in the radial direction provided on the base 2 are arranged on the circumference of the support member 4. This is a structure that is received by three pairs of balls 5.
- the ball 5 is inserted into the support member 4 at the bottom of a storage hole 6 opened by a ball end mill in parallel with the direction of the detection needle 1.
- a slit 7 for inserting the support leg 3 is formed between the receiving holes 6 for inserting the two balls each receiving one support leg 3.
- the support member 4 is provided with a small screw hole 8 in a direction in contact with the pitch circle of the ball from the outer periphery of the support member 4 toward the top of the ball 5 located at the bottom of the storage hole 6.
- a small screw 9 whose tip is pointed conically is screwed into the small screw hole.
- FIG. 3 is a diagram showing a second example in which the ball 5 is pressed and fixed to the receiving surface 12 at the bottom of the storage hole.
- the front end side is inclined downward from the outer periphery of the support member 4 in the plane in contact with the arrangement pitch circle of the ball toward the top of the ball 5 located at the bottom of the storage hole 6.
- a machine screw hole 8 is provided. The tip of the small screw 9 screwed into the small screw hole 8 presses the ball 5 against the hemispherical or conical receiving surface 12 formed at the bottom of the storage hole by the screw shaft direction of the small screw. Fix it.
- FIG. 4 is a view showing a third example in which the ball 5 is pressed and fixed to the receiving surface 12 at the bottom of the storage hole.
- a small screw hole whose tip side is inclined downward from the outer periphery of the support member 4 in a plane in contact with the pitch pitch circle of the ball 8 is provided, and a spring insertion hole 18 that extends from the tip of the small screw hole in the screw shaft direction and opens into the storage hole 6 is provided.
- Each of the balls 5 supporting the detection needle 1 is provided with one small screw hole 8 or a spring insertion hole 18 and a small screw 9 or a spring 19, and these small screws 9 are tightened.
- the six balls 5 are fixed in place in a state where they are in direct contact with the bottom surface of each storage hole 6 without interposing an adhesive layer. That is, in the structure of the present invention, it is not necessary to use an adhesive to fix the ball 5 to the bottom 12 of the storage hole.
- the three support legs 3 are supported by the six balls 5 each fixed in place, so that the stable position of the detection end 13 at the tip of the support needle 1 is maintained. Is done.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Measuring Leads Or Probes (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008525863A JP5133884B2 (ja) | 2006-07-18 | 2007-07-17 | 接触検出器 |
CN2007800257729A CN101490500B (zh) | 2006-07-18 | 2007-07-17 | 接触检测器 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006195900 | 2006-07-18 | ||
JP2006-195900 | 2006-07-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008010492A1 true WO2008010492A1 (fr) | 2008-01-24 |
Family
ID=38956823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/064100 WO2008010492A1 (fr) | 2006-07-18 | 2007-07-17 | Détecteur de contact |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP5133884B2 (ja) |
CN (1) | CN101490500B (ja) |
WO (1) | WO2008010492A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012137768A1 (ja) * | 2011-04-05 | 2012-10-11 | 日新産業株式会社 | 位置検出器 |
EP2657642A1 (de) * | 2012-04-24 | 2013-10-30 | Hexagon Technology Center GmbH | Sensorelement für eine Messmaschine, insbesondere eine Koordinatenmessmaschine |
CN103459972B (zh) * | 2011-04-05 | 2016-11-30 | 日新产业株式会社 | 位置检测器 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112902837A (zh) * | 2020-12-29 | 2021-06-04 | 山西裕鼎精密科技有限公司 | 刀检仪以及应用于所述刀检仪的刀检方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59176602A (ja) * | 1972-09-21 | 1984-10-06 | ロ−ルス・ロイス(1971)リミテツド | 測定探子 |
JPS63263406A (ja) * | 1987-04-21 | 1988-10-31 | Mitsutoyo Corp | タツチ信号プロ−ブ |
JP2002357403A (ja) * | 2001-05-31 | 2002-12-13 | Mitsutoyo Corp | タッチ信号プローブの信号処理装置および信号処理方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0810133B2 (ja) * | 1986-07-17 | 1996-01-31 | 宣夫 福久 | 位置検出器 |
-
2007
- 2007-07-17 JP JP2008525863A patent/JP5133884B2/ja active Active
- 2007-07-17 WO PCT/JP2007/064100 patent/WO2008010492A1/ja active Application Filing
- 2007-07-17 CN CN2007800257729A patent/CN101490500B/zh not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59176602A (ja) * | 1972-09-21 | 1984-10-06 | ロ−ルス・ロイス(1971)リミテツド | 測定探子 |
JPS63263406A (ja) * | 1987-04-21 | 1988-10-31 | Mitsutoyo Corp | タツチ信号プロ−ブ |
JP2002357403A (ja) * | 2001-05-31 | 2002-12-13 | Mitsutoyo Corp | タッチ信号プローブの信号処理装置および信号処理方法 |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012137768A1 (ja) * | 2011-04-05 | 2012-10-11 | 日新産業株式会社 | 位置検出器 |
CN103459972A (zh) * | 2011-04-05 | 2013-12-18 | 日新产业株式会社 | 位置检测器 |
JP5936199B2 (ja) * | 2011-04-05 | 2016-06-22 | 日新産業株式会社 | 位置検出器 |
CN103459972B (zh) * | 2011-04-05 | 2016-11-30 | 日新产业株式会社 | 位置检测器 |
EP2657642A1 (de) * | 2012-04-24 | 2013-10-30 | Hexagon Technology Center GmbH | Sensorelement für eine Messmaschine, insbesondere eine Koordinatenmessmaschine |
WO2013160143A1 (de) * | 2012-04-24 | 2013-10-31 | Hexagon Technology Center Gmbh | Sensorelement für eine messmaschine, insbesondere eine koordinatenmessmaschine |
US9459091B2 (en) | 2012-04-24 | 2016-10-04 | Hexagon Technology Center Gmbh | Sensor element for a measuring machine, in particular a coordinate measuring machine |
Also Published As
Publication number | Publication date |
---|---|
CN101490500B (zh) | 2010-12-01 |
JPWO2008010492A1 (ja) | 2009-12-17 |
JP5133884B2 (ja) | 2013-01-30 |
CN101490500A (zh) | 2009-07-22 |
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