JPS59170704A - Measuring probe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a probe used in a measuring device, and more particularly to a probe for detecting contact between a needle and an object, that is, a measurement target. Such probes are applied to orthogonal slides that perform measurements within a rectangular coordinate frame.

One object of the invention of this application is to provide a measurement probe that can repeatedly and accurately detect an object.

Another object of the invention of this application is to provide a measurement probe which, in addition to the above-mentioned characteristics, can detect a roughly curved structure.

The probe is arranged to contact an object to close and listen to an electrical circuit, and indicator lamps are provided to indicate the status of the circuit.Generally, the probe is arranged to open and close the circuit. As long as the probe is not in contact with an object, the indicator lamp lights up, making it easy to detect if the probe is not working properly.

According to the invention, a probe is installed for pushing the button, the housing and a device for pushing the needle in the direction of a rest position relative to the housing, so that the button can be displaced within a limited range from said rest position. A device is provided for sensing the displacement of the saw in different directions relative to the housing.

In a preferred embodiment of the invention, the i (i) are substantially equiangular radially extending members, the nails are pressed into a fixed rest position with respect to the housing, and each member has a respective
), the limited deflection of the nail from the rest position takes a -C different orientation with respect to the housing, and at least one of said members engages one side m of said groove; A device is provided for detecting swinging of the button when it is no longer in contact with at least one of the buttons.

Such a device for detecting the limited run-out of a nail has an electrical circuit which is in e.g. a blank state when the nail is in its rest position, the circuit passing from one V-shaped d4 to the next adjacent groove, Each member forms an open circuit between opposite sides of its respective ■-shaped groove.

In another embodiment of the invention, the button has two ``■'' shapes arranged axially in the rest position! 7/i, and the back end of the needle itself is pushed into engagement with the ramp.
In this case, the limited deflection of the button from its rest position changes the direction of deflection of α1 relative to the housing, thus adjusting the contact state of at least one side of one of the V-shaped grooves and thereby reducing the deflection of the sword. A detection device is installed.

An example of the present invention will be described below in detail with reference to the drawings. In FIGS. 1 to 3, the probe 1 is placed on the right side of the housing 2 and the button 3. Three members 4 extend radially from the sword 3, and the needle 3 is spring-biased by a spring 5 acting on its top 6 towards a rest position defined by the housing 2. In this rest position, each member 4 engages the sides 6.7 of each V-shaped groove 8.
It is formed between a pair of ball bearings 9 and 1o, which are respectively installed in the ball bearings 12.

Attached to the tip of the end 13 of the needle 3, which extends -C through the housing 2, is a ball 14 which is properly centered and located fff.

In the above configuration, the probe 1 is connected to a coordinate measuring device (not shown), such as a rectangular coordinate frame or a spherical polar coordinate frame, and can move in space in any direction so as to detect the boundary of the object to be measured. The contact engagement between the ball 14 and the object displaces the button 3 away from the rest position against the spring force of the spring 5.

While the button 3 is being displaced in this manner, the position or orientation of the button 3 with respect to the housing 2 changes.

The displacement is detected by forming an electrical circuit 15 which is turned on, for example, when the hook 3 is in the weight position.

The ball bearings 9 and 10 are insulated from each other and from the housing 2 by an insulator 16. The circuit is formed in series from the ■-shaped grooves 8 to the adjacent IQ, and each of the members 4, which are insulated from the ribs 13 and other members 4, forms a closed circuit between the sides 6.7 of each V-shaped groove 8. form. When the hook 3 is displaced from the rest position, the member 4 makes at least one contact on one side of each V-shaped groove 8, thereby interrupting the circuit 15 and turning on the power supply 18 at all times. The display lamp 1γ that is displayed is turned off.

The interruption of the circuit is not shown, but at this time an input pulse is also applied to an automatic switching device, known per se, which commands the device to read and record the coordinates of the probe. It is used to 1 microsensor
It is known that pulses of M allow highly accurate measurements.

A gap 19 is provided between the nail 3 and the housing 2, which gap 19 allows a limited displacement of the needle within the housing 2. By receiving this elastically by the compression of the spring 5, the force against the hook 3 based on the inertia of the probe during measurement (
damage caused by If the inertia of the probe is a problem, for example the internal force 1 is to prevent the axis 2o of the needle 3 from bending after a reading has been taken, but this can be prevented by providing the needle with a breaking device known per se. Solvable.

In constructing the probe, it is necessary to ensure good contact between each member of each set of ball bearings. This means that the part 21 of each member 4 to be fitted to 213 is covered with glue and insulated, the probe is assembled there 1, and the spring 5 is held as a holder. Once the glue has set and the circuit is connected to the power supply 18, the indicator lamp 17 will illuminate to indicate that all three switches are in contact.

In this way, manufacturing tolerances associated with the depth of the bore in which each ball bearing 9.10 is placed are avoided. In order to ensure that the center of the sphere 14 is in the desired position relative to the probe, it is
3 to mount the ball 14 and its associated shaft 20.

The shaft 20 of the needle 3 is set aside by the spigots 1-24 on shafts that engage the holes formed in the counterbore. The center of the ball 14 is located at the needle 3 while the probe and ball 14 are held in the assembly jig.
It is aligned with the housing 2 by loosely fitting the spigot 2/l into the counterbore and gluing it together.

The bore 26 for the ball bearings 9.10 is smaller than the diameter of each ball bearing.
(b) The housing 2 is drilled with a small diameter, so that incorrect ball bearings can be easily removed and replaced during assembly.

Shown in Figure 1! The axis No. 13 is coaxial with the detector, but this is not necessary for the operation of the device; for example, when measuring a cylinder hole, it is preferable to place the ball and axis in the radial direction of the position shown. will become clear.

If the housing 2 is filled with electrical insulating oil, the operation of the probe can be improved. This prevents sparks at the contact area that would lead to deterioration of the contact area, and the rubber gark 27 prevents and limits the leakage of oil along axis 3 (for placement of the probe in the upper position of It has just enough elasticity to avoid being pressed.

■The electrical connection between the letter-shaped grooves 8 is in the shape of the housing 2! f/
i 28 as appropriate. The use of ball bearings to form a V-shaped R is for convenience, as each set of ball bearings can be replaced by a pair of needles tilted toward each other. should be obvious.

In this embodiment, in d3, the displacement from the rest position of group 3 is limited and detected by the same device.

FIGS. 4 and 5 (showing another embodiment of the present invention and having a V-shape formed in the same manner as described with respect to FIGS. 1 to 3) j4 and cooperating pipes 3, respectively; FIGS. The needles are on the right side of the legs 81, 82, 83 of the human body circular shape. One leg 83 of the three legs extends horizontally to form a measuring ball]/
I support I. This embodiment has, for example, J in the measurement of one hole in the circle, and Toshisada in the hollow position.

Above) When measuring an object in the small embodiment, a series of blank tags are placed at various positions around the object, and two blocks are programmed to compare the reference object and the measurement object. This provides information that can easily be used to create input data for computers. The measuring probe according to the invention can therefore be used to measure objects such as pipes of gas turbine engines or cylinder blocks of internal combustion engines.

Although the probe described in Section 1 is equipped with a detector having an electrical switching device, it is possible to replace the electrical switching device with a fluidic switch or other switch, or replace the detector with another device other than the switch. It is clear that this can be done. Each detector is fitted with an optical projection device that magnifies the misalignment between the 12 pointers resulting in the fingernail movement of a button, for example.

It will also be apparent that any of the embodiments described above may be filled with oil in a manner similar to that described in FIGS. 1-3.

As described above, according to the invention recited in claim 1, when (j contacts the object (object), the displacement of the button is γ
F and then when the needle leaves the object, the engagement element;
Due to the convergence surface and deflection means action, ↓1 accurately returns to the original body position (
Since it returns to position ``A'' relative to the fixed part shrine, accurate detection of the object can be performed repeatedly.

Further, according to the invention set forth in claim 2, a signal is emitted based on the contact/separation between the engagement element and the converging surface phase H for accurately returning the sword to the body. The structure of the measurement probe is simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a probe constructed according to the present invention;
Figure 2 is a view seen from the II-If line direction in Figure 1;
The figure is a cross-sectional view taken along the line III-III in Figure 2, and Figure 4 is a cross-sectional view of another probe.
It is a cross-sectional view taken along the line ■-■ of the probe in the figure at d3. 31...
・Measurement probe, 2...housing, 3...button, 5...
・Spring, 8...V-shaped ij, etc., 9.10...Ball bearing, 14...Ball, 15...Electric circuit, 1G...Insulator, 17...Indication lamp, 18. ··power supply. Applicant's agent Kiyoshi Inomata Figure 1 Figure 5 -■ Procedure - Amendment March 2, 1980 Commissioner of the Patent Office Kazuo Wakasugi 1 Indication of the case 1983 Patent application No. 37191 2 Name of the invention 3 Relationship with the case of the person making the amendment Patent applicant Rolls-Royce (1971) Limited 4 Agent The scope of the patent claims is amended as shown in the attached document. 2. Claims (1) The invention comprises a fixed element and a movable element having a needle that detects and covers a measurement target, and the fixed element and the element can be moved relative to each other, and the fixed element is The movable element is supported at three mutually spaced lζ positions, further comprising means for generating a signal when the needle is in a predetermined positional relationship with respect to the object to be measured; one having a pair of mutually converging surfaces at each of said spaced locations, and the other of said movable element and said fixed element engaging both said pair of converging surfaces at each of said spaced locations; matable engagement elements, the pair of converging surfaces each converge in a first direction and resist movement of the engagement elements in a second direction, and the engagement elements said fixed element to allow movement in said first, second and third directions (which are orthogonal to each other, and further push said movable element in said first direction); biasing means adapted to bring the engagement element into contact with both of the pair of converging surfaces to form a rest position for the movable element, the movable element being forced towards the side; is moved from the rest position against the biasing means, and then when no force is applied to the needle, the biasing means and the converging surface cooperate to return the movable element to the rest position. A measurement probe characterized by: (2) the engagement element in each of the positions;
At least one of the converging surfaces constitutes a pair of electrical contacts, and the means for generating the signal changes the contact state of one of the contacts by movement of the movable element. 2. The measurement probe according to claim 1, further comprising electrical circuit means which change the conduction state when
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Claims (2)

[Claims] (1) The fixed element includes a fixed element and a movable element having a needle for detecting a measurement target, the fixed element and the movable element L are movable relative to each other, and the fixed element is arranged at three positions 16 spaced apart from each other. 'c A means for supporting the movable element and transmitting a signal when the flywheel reaches a predetermined positional relationship with respect to the object to be measured, and either the movable element or the fixed element One for each of the above spaced positions!
1, the other of the movable element and the fixed element 4; a mating element, the converging surfaces of said -j respectively converge in a first direction and resist movement of said engaging element in a second direction; the first, second and third directions are perpendicular to the base, and the movable element is forced in the first direction to the fixed element. and biasing means adapted to bring the engagement element into contact with both of the pair of converging surfaces to form a body position for the movable element, the movable element being in contact with the needle. When a force is applied to /j and the body moves from the rest position A against the biasing means, and thereafter no force is applied to the biasing means, the biasing stage and the converging surface cooperate. The measuring probe is characterized in that the movable element is returned to the rest position at the step of: (2) at each of said positions, the -1-coupling element and at least one of said converging surfaces constitute a pair of electrical contacts, and the means for generating said signal comprises: The movable element comprises electrical circuit means for changing the conduction state when the contact state of either one of the lightning contacts changes as the movable element continues to move; Claim 1 characterized in that it forms a part of
Measurement probe described in section f.