WO1987000915A1 - Detecteur de position - Google Patents

Detecteur de position Download PDF

Info

Publication number
WO1987000915A1
WO1987000915A1 PCT/JP1985/000429 JP8500429W WO8700915A1 WO 1987000915 A1 WO1987000915 A1 WO 1987000915A1 JP 8500429 W JP8500429 W JP 8500429W WO 8700915 A1 WO8700915 A1 WO 8700915A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact needle
housing
contact
pole plate
position detecting
Prior art date
Application number
PCT/JP1985/000429
Other languages
English (en)
Japanese (ja)
Inventor
Norio Fukuhisa
Original Assignee
Norio Fukuhisa
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 Norio Fukuhisa filed Critical Norio Fukuhisa
Priority to PCT/JP1985/000429 priority Critical patent/WO1987000915A1/fr
Publication of WO1987000915A1 publication Critical patent/WO1987000915A1/fr

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
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/004—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points
    • G01B7/008—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring coordinates of points using coordinate measuring machines
    • G01B7/012—Contact-making feeler heads therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/002—Constructional details of contacts for gauges actuating one or more contacts

Definitions

  • the present invention relates to a position detecting device, and more specifically, to a position detecting device that detects the position of the surface of an ake placed in a three-dimensional space by a contact needle. It is related to the position detection device that is used when measuring the dimension of the rake, which is attached to the image transfer tool.
  • this type of position detecting device has housings 1 and 2 mounted on a tool shaft 9 of a sewing machine and a contact needle 5 extending from the housing, as shown in FIG. Hold the tip 5a of the contact needle 5 on the engagement pair attached to the housing 1 and the spring 5 in a predetermined static position, and move the contact needle 5 when the tip 5a contacts the wake 41. It has a structure that electrically detects displacement.
  • the displacement of the contact needle can be detected as the potential difference at the diagonal point of the bridge circuit, which covers the capacitor formed by the above-mentioned electrode plate. It can be detected as a change in the frequency of the transmission II path, and the detected signal can be output as an A-D converted electrical signal or optical signal.
  • the relationship between the electrode plate spacing and the capacitance of a capacitor composed of two electrode plates is as shown in Fig. 5, and when the electrode plate spacing is A, the electrode plate spacing is There is a large change in capacitance due to fluctuations. Although the output accuracy can be increased, when the electrode plate spacing becomes B, the change in the capacitance due to the variation of the electrode plate spacing becomes small, and therefore the detection accuracy decreases. Also, the detection signal level will change greatly from a to b. That is, when detecting the displacement of the contact needle due to the change in the electrostatic capacity of the capacitor composed of two poles, the initial interval between the two poles is accurately set to the predetermined interspace. Doing is an essential requirement.
  • the contact needle 5 needs to be in a static position and the tip 5a must be accurately located on the center axis of the housing, but this position accuracy of the tip must be adjusted. It is not possible to achieve this with the accuracy of the contact needle, but in reality, the base of the contact needle is positioned at a static position. In addition, the contact needle tip 5a is adjusted so that it is on the central axis of the housing.
  • this problem can determine the above-mentioned problems of the position detection device that detects the displacement of the contact needle in accordance with the displacement of capacitance.
  • Still another object of the present invention is to provide an excellent pair of engagements for holding the contact needle in a static position in the position detecting device having the above structure.
  • Fig. 1 is an exploded cross-sectional view of the position detector
  • Fig. 2 and Fig. 3 are bottom views showing the support structure of the contact needle of the position detector
  • Fig. 4 is the position detector attached to the image transfer tool shaft.
  • the front view of the device and Fig. 5 are graphs showing the relationship between the polar spacing of capacitors and the capacitance.
  • 1 is the housing housing
  • 2 is the mounting housing
  • 3 is the taper shank
  • 4 is the tapered hole
  • 5 is the contact needle
  • 5a is its tip
  • 6 is the capacitor
  • 7 is the transmitter / receiver
  • 8 is the electrical equipment.
  • Circuit 1 1 1 inner housing, 1 3 spring plate, 1 5 compression coil spring, 1 6 through hole, 1 7 sliding rod, 1 8 contact needle base, 1 9 compression coil spring, 20 is a support rod, 21 is an end face plate, 2 2, 2 2 a, 22 b is a receiving groove, 2 3 is a coil spring, 2 4 is a through hole, 2 7 is a compression coil spring, 2 8 is an insulator, 2 9 is a fixed pole, 30 is an insulating film, 3 1 is a movable pole plate, 3 3 is a set screen, 3 6 is a light emitting diode, 3 7 is an external device, 3 8 is a light receiving element, 3 9 and 40 are coils and 4 1 are smoke.
  • the housing is the housing The housing is divided into 1 and the mounting housing 2, and both housings are integrated by fitting the taper shank 3 and the tapered hole 4.
  • a contact needle 5 is attached to the housing 1 of the main body, and an electric 11 path 8 including a capacitor 6 for detecting the displacement of the contact needle 5 and a transmitter / receiver 7 is stored.
  • the mounting housing 2 is also provided with a taper shank 10 for fitting the device onto the rotating tool shaft 9. ,
  • Figure 1 is a cross-sectional view of housings 1 and 2, where 1 1 is the inner housing fitted to the body housing 1, and 1 2 is the snap fitting fitted to the outer circumference of the inch-housing 1 1.
  • 13 is a spring receiving plate
  • 14 is a snap ring fitted to the inner diameter of the housing 1 of the main body
  • 15 is a compression coil spring interposed between the snubbing 1 2 and the spring receiving plate 1 3.
  • the inner housing 1 1 and the spring bearing plate 1 3 of the coil spring are attached to the housing 1 of the main body.
  • the inner housing 11 is provided with a through hole 16 in the axial direction of the housing 11 at the center thereof, and a sliding rod 17 is slidably inserted through the through hole 16. Iru.
  • 1 8 is a disk-shaped base of the contact needle 5
  • 19 is a compression coil spring interposed between the peripheral edge of the base 18 and the body housing
  • 20 is a peripheral edge of the body housing end plate 21. It is the supporting sweat that sticks out in the area.
  • the supporting rods 20 are planted at the respective vertex positions of an equilateral triangle with the contact needle 5 as the center, and the supporting rods 20 and the supporting rods 20 are attached to the base body 18.
  • a receiving groove 22 that engages is provided.
  • the contact needle 5 is held in the static position in a state of being supported at three points by being pressed against the supporting rod 20 by the biasing force of the coil spring 19 and being supported.
  • 2 3 is a coil spring which is fitted and erected on the face plate 21. This coil spring 2 3 is fitted into the through hole 24 provided in the base body 18 and the contact needle It has the effect of elastically suppressing the motions of 5.
  • the support rods 20 are provided by being screwed into the body housing 1 respectively, and the structure can be adjusted by rotating them. Furthermore, a set screw 25 for pressing the supporting rod 20 from the lateral direction is provided at the screwing portion of each supporting rod 20 to fix the supporting rod 20 adjusted to a predetermined height. If the receiving groove 2 2 is provided so that each side of the equilateral triangle is formed in the plane of the base body 18 facing the end face plate 21 as shown in Fig. 2, it is shown in Fig. 3. It is preferable to form a groove 22a passing through the center of the substrate 18 and two grooves 22b and 22b obliquely arranged with the groove 22a as the center line of symmetry. Due to such a structure, the position error of the support rod 20 is absorbed by the slight movement of the contact needle 5 without any eccentric movement, and the movement of the contact needle 5 in the static position is absorbed. A high degree of resilience is guaranteed.
  • the tip of the sliding rod 17 is then elastically pressed against the back side of the base body 18 by the urging force of the compression coil spring 27 interposed between the disc 2 6 of the slide and the spring bearing 1 3.
  • the inner housing 1 1 1 has a disk-shaped fixed electrode plate 2 9 attached via an insulator 28, and the fixed electrode plate 2 9 is made of a thin mica plate of a predetermined thickness. It is facing the movable electrode plate 3 1 with the perfect film 30.
  • the movable pole plate 3 1 is slidably slid through the sliding rod 17 and the compression coil spring 3 2 interposed between the movable pole plate 3 1 and the rod support plate 1 3 is fixed to the pole plate 2 It is urged towards 9.
  • the movable pole support 31 is provided with a set screw 3 3 for fixing the movable pole support 3 1 to the sliding rod 1 7, and the body housing 1 is provided with the set screw 33.
  • 3 5 is a rubber cap that covers the hole 3 and can be freely attached.
  • Polar poles 2 9 and 3 1 are connected as a capacitor element 6 of the electrical 11 path 8 and a change in the distance between the polar poles 2 9 and 3 1 causes some II path constant of the electrical circuit 8 to change. This change is amplified and A-D converted, and when the distance between the electrodes 29 and 31 changes more than a certain value, the light emitting diode 36 connected to the electric image path 8 emits light.
  • the light emitting diode 36 is provided so as to project from the housing 1 and is housed in the receiving device 7 and is provided on the working machine side when the position detecting device is attached to the tool shaft 9. It faces the light receiving element 38 of the external device 37.
  • the light receiving element 38 is connected to the NC controller of the operating machine.
  • the transmitter / receiver ⁇ and the external device 37 are provided with facing coils 39 and 40, respectively, and the coil 40 of the external device is connected to a high frequency power source, and the coil of the transmitter / receiver 7 is connected.
  • Rule 39 is connected to the power input terminal of the electric circuit ⁇ .
  • the transmitting / receiving device 7 faces the external device 37. Fix the main body housing 1 and the mounting housing 2 by fitting the taper shank 3 and the taper hole 10 together. Then, the set screen 33 is loosened so that the movable electrode plate 31 is sandwiched between the fixed film 30 and the fixed electrode plate 29 so as to be in a closed position. In this state, fit the shank 10 on an appropriate rotary saddle, and while moving the rotary shaft, make sure that the tip of the contact needle 5 is accurately positioned on the rotary axis so that the height of the support rod 20 is high.
  • the position detection device adjusted in this way is fitted to the tool shaft 9 of the working machine and the tool wheel 9 is moved to bring the tip of the contact needle 5 into contact with the wake 41.
  • the contact needle 5 is moved in the axial direction against the biasing force of the spring 19 or is tilted as shown by the imaginary line in Fig. 1. Even in the case of deviation, this displacement of the contact needle 5 can move the sliding rod 17 in the axial direction against the biasing force of the spring 27, so that it slides on the set screen 33.
  • the movable pole support 3 1 that is faced to the rod 1 7 moves in a direction away from the fixed pole plate 29, and this is detected by the electric circuit 8 as a change in the electrostatic capacitance between the pole plates 2 9 and 3 1.
  • This detection signal is transmitted to the NC control device via the light emitting diode 36 and the light receiving element 38, and the position of the surface of the fork 41 is grasped by the NC control device as a numerical value.
  • the housing of the position detection device is divided into a housing 1 for mounting and a housing 2 for mounting, and both are faced by fitting the taper shank 3 and the taper hole 4 together.
  • the reason is that the mounting position of the external device 37 differs depending on the type of machine. That is, since the mounting direction of the mounting housing 2 on the tool shaft 9 of the ATC device is always a fixed direction, the direction of the transmitter / receiver device 7 of the main body housing should be determined regardless of the mounting housing 2 direction. It is possible to easily respond to changes in the position of the external device 37 depending on the type of machine.
  • the static position of the contact needle 5 can be adjusted irrespective of the pole spacing of the capacitor for displacement detection, and the pole plate spacing of the capacitor at the static position can be adjusted by the edging. Since the film thickness can be set accurately, adjustment work after device assembly is greatly simplified. Therefore, it is possible to provide a high-accuracy position detection device at low cost.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Détecteur de position destiné à être utilisé pour détecter à l'aide d'un aiguille de contact la position d'une surface d'une pièce à usiner placée dans un espace tridimensionnel. Un détecteur de position conventionnel de ce type est conçu pour détecter la posistion en déterminant les variations de la capacité électrostatique entre une plaque polaire fixée à une enceinte et une plaque polaire fixée sur l'organe de base d'une aiguille de contact. Toutefois, dans le détecteur de position conventionnel ci-décrit, une plaque polaire est fixée complètement sur l'organe de base de l'aiguille de contact. Par conséquent, si la position de la pointe de l'aiguille de contact est régulée, la distance entre les plaques polaires varie simultanément, ce qui rend difficile d'augmenter la précision du détecteur à un niveau élevé. Selon la présente invention, un organe de base présente une tige coulissante comprimée de manière résiliente contre sa partie arrière, et cette tige coulissante est introduite de manière mobile à travers une plaque polaire, un organe de fixation permettant de fixer la plaque polaire sur la partie désirée de la surface externe de la tige coulissante. Par cet agencement, la position de l'aiguille de contact peut être régulée indépendamment de la distance entre les plaques polaires, et cette distance dans la position statique mentionnée peut être déterminée avec précision en fonction de l'épaisseur d'un film isolant introduit entre les plaques. Il est par conséquent possible de simplifier de manière considérable l'opération de réglage de l'aiguille de contact et d'exécuter avec une grande précision l'opération de détection de position.
PCT/JP1985/000429 1985-07-30 1985-07-30 Detecteur de position WO1987000915A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP1985/000429 WO1987000915A1 (fr) 1985-07-30 1985-07-30 Detecteur de position

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1985/000429 WO1987000915A1 (fr) 1985-07-30 1985-07-30 Detecteur de position

Publications (1)

Publication Number Publication Date
WO1987000915A1 true WO1987000915A1 (fr) 1987-02-12

Family

ID=13846538

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1985/000429 WO1987000915A1 (fr) 1985-07-30 1985-07-30 Detecteur de position

Country Status (1)

Country Link
WO (1) WO1987000915A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114322699A (zh) * 2021-12-30 2022-04-12 南通航泰机械有限公司 一种高精度柴油机配件用开孔检测装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5536798A (en) * 1978-07-07 1980-03-14 Rolls Royce Supervisory device
JPS57170006U (fr) * 1981-04-21 1982-10-26
JPS57179105U (fr) * 1981-05-11 1982-11-13
JPS5866307U (ja) * 1976-12-24 1983-05-06 ロ−ルス−ロイス、リミテツド 測定機において使用される探針
JPS58151503A (ja) * 1982-03-05 1983-09-08 Sony Magnescale Inc 位置検出装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5866307U (ja) * 1976-12-24 1983-05-06 ロ−ルス−ロイス、リミテツド 測定機において使用される探針
JPS5536798A (en) * 1978-07-07 1980-03-14 Rolls Royce Supervisory device
JPS57170006U (fr) * 1981-04-21 1982-10-26
JPS57179105U (fr) * 1981-05-11 1982-11-13
JPS58151503A (ja) * 1982-03-05 1983-09-08 Sony Magnescale Inc 位置検出装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114322699A (zh) * 2021-12-30 2022-04-12 南通航泰机械有限公司 一种高精度柴油机配件用开孔检测装置

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