JPH0352895B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is a device that measures dimensions such as hole diameters of multiple types using a detector such as a differential transformer, and is particularly suitable for use on a production line. Concerning a measuring device.

[Prior art]

This type of dimension measuring device includes a casing supported so as to be movable forward and backward, at least one pair of movable members supported by the casing so as to be openable and closable in a direction substantially orthogonal to the forward and backward direction, and a distal end thereof extending in the orthogonal direction. Some devices include a probe elastically supported by each of the movable members and a detector that detects relative displacement between the probe and the movable member.
This type of dimension measuring device uses a plurality of masters and positions a measuring element at a plurality of reference positions to measure a wide range of dimensions or a plurality of types of dimensions.

The applicant previously proposed a device related to this type of device in U.S. Pat. No. 58-116449.
In this method, a contact member that contacts the surface to be measured is fixed to a movable member near the probe, and by bringing this contact member into contact with the master, the expansion and contraction movement of the movable member is stopped. After this expansion/contraction movement is stopped, the movement of the expansion piece that is in contact with the tapered surface inside one end of the movable member is restrained by the collect chuck to hold the movable member at a reference position corresponding to each master.

[Problem that the invention seeks to solve]

The dimension measuring device of the above invention is carried out by inserting the abutting member and the measuring element into the measuring hole of the object to be measured, but the dimension measuring device and the measuring hole are not necessarily kept coaxial during this insertion. Therefore, when inserting the dimension measuring device into the measuring hole, an external force is applied to the abutting member provided on the movable member, causing the expansion piece to move in the axial direction via the tapered surface despite being restrained by a collection chuck or the like. However, there was a problem in that the movable member was displaced in the radial direction, causing deviation in the reference position and causing measurement errors.

The present invention prevents the movable member from being displaced in the radial direction even if force is applied to the movable member when inserting this type of dimension measuring device using a plurality of masters into a measurement hole, and the reference position of the movable member. The purpose is to prevent deviations from occurring and eliminate the causes of measurement errors.

[Means for solving problems]

In order to achieve such an object, the present invention includes a casing that is supported so as to be movable relative to a mounting base that supports a measurement object, and a casing that extends substantially parallel to and parallel to the direction of movement of the casing. at least one pair of movable members supported by the casing so as to be openable and closable in substantially orthogonal directions; and a pair of movable members elastically supported by the movable members so as to be able to approach and separate from each other with their tips facing the orthogonal directions. In a dimension measuring device equipped with a measuring element and a pair of detectors that respectively detect relative displacement between each measuring element and each of the movable members, a measuring element is provided that is parallel to the advancing and retracting direction exactly in the middle of each of the movable members. a multistage stopper supported by the casing so as to be movable along an axis; and a multistage stopper formed symmetrically with respect to the axis on both sides of the multistage stopper, each pair being substantially parallel to the equiaxial line, and having a width between each pair. a plurality of pairs of step portions each having a different height, and the multi-step stopper are moved along the axis, a predetermined pair is selected from the plurality of pairs of step portions, and this is positioned at a predetermined axial position with respect to the casing; a positioning device for holding the movable members in the predetermined positions; and a device for holding the movable members in the predetermined positions by abutting mutually corresponding parts of the movable members from the orthogonal direction against the pair of stepped portions positioned in this way. The device is characterized by being equipped with a connecting device.

〔Effect of the invention〕

The dimension measuring device according to the present invention having such a configuration moves a multi-stage stopper having a plurality of pairs of stepped portions in parallel to the advancing/retracting direction of the casing, and places each movable member on a predetermined pair of selectively positioned stepped portions. Since the distance between the corresponding portions of the movable member is maintained at the width between the selected pair of step portions by abutting the corresponding portions from a direction perpendicular to the movement of the multi-stage stopper, By holding the movable member at a plurality of reference positions, it is possible to measure a plurality of types of hole diameters, etc.
In addition, each pair of step portions that abut each movable member are made almost parallel to the moving direction of the multi-stage stopper, so even if force is applied to the movable member when inserting this dimension measuring device into the measurement hole, the multi-stage stopper will not move. There is no risk of movement in the axial direction, and therefore there is no possibility that the reference position of the movable member will be out of alignment, causing measurement errors.

〔Example〕

First, the outline of the embodiment shown in FIGS. 1 to 4 will be explained.
As shown in FIG. 4, it is used by being suspended and supported so as to be movable up and down by a cylinder 23 for raising and lowering via a support 16. The casing 30 is supported by a pair of movable members 4 by a first support spring 43 provided at the bottom.
0, 40 are supported so as to be openable and closable, and each movable member 40, 40 is supported by a second and third support spring 4, respectively.
4 and 45 swingably support the lever 42,
A measuring element 46 that comes into contact with the inner surface of the measuring hole Wa of the object W is provided at the tip of each lever 42.
A detector 4 is provided at the opposite end of the movable member 40 to detect the relative displacement between the two movable members 40 and 42.
7 and measure the dimensions. A multistage stopper 70 having a plurality of step portions 71 is provided between the two movable members 40, 40 so as to be axially movable, and the multistage stopper 70 is axially moved by a selection device 50 to selectively position the multistage stopper 70. Then, the contact elements 40b at the tips of the two movable members 40, 40 are brought into contact with the predetermined stepped portions 71a, respectively, by the contact device 48 (see FIG. 3) such as a return spring, and the two movable members 40, 40 are brought into contact with each other. is held at a predetermined reference position.

This example will be explained in detail below.

As shown in FIG. 1, the casing 30 consists of a cylindrical body 31, an upper member 32, and a tip member 33 that are integrally fixed to each other, and a hanging rod 35 and a floating rod fixed to the upper part (on the left side in FIG. 1). It is suspended and supported by the support body 16 via a suspension tube 36 having a built-in mechanism (not shown) so as to be movable up and down. A support member 34 is fixed inside the tip member 33, and a pair of movable members 40 extend substantially parallel to the moving direction of the casing 30 via a first support spring 43 in the form of a leaf spring by means of a central protrusion 34b. ,40
is supported at its lower part, and each movable member 40 can be opened and closed in a direction orthogonal to the moving direction of the casing 30. An expanding cylinder device 41 for expanding the movable members 40, 40 to each other is provided in the center of the movable members 40, 40, and as shown in FIG. A contact device 48, such as a return spring, is provided between the two movable members 40, 40 to urge the two movable members 40 in a direction to close each other and contact the stepped portion 71a.

Each movable member 40 is connected to a lever 4 by means of second and third support springs 44 and 45 in the form of leaf springs, respectively, on the outside of its lower part (right side in FIG. 1).
2 is elastically supported in a swingable manner. Each lever 42 extends downward from the casing 30 through the through hole 34a of the support member 34 and the notch 33a of the tip member 33, and fixes the probe 46 and the guide member 49 to the tip 42a. extend upward along the movable member 40 from the support portions of the support springs 44 and 45, and a detector 47a of each detector 47 such as a differential transformer provided on each movable member 40 is fixed to each tip thereof. . The tip end 4 of the lever 42 is opened and closed around the first support spring 43 of each movable member 40.
2a and the tip portion 42a due to the swinging of the lever 42 around the second and third support springs 44 and 45.
The directions of movement are substantially orthogonal to the direction of movement of the casing 30, and the probes 46, which move toward and away from each other due to this movement, are fixed to the tip portion 42a with their tips 46a facing in this direction of movement.
Note that the tip 49a of the guide member 49 is connected to the movable member 40.
In all possible positions, the contact point 46 is always
It shall be located inside the tip 46a of the.

As shown in FIG. 1, the multi-stage stopper 70 is located between the distal end halves of both movable members 40, and engages the upper member 32 of the casing 30 via a reciprocating rod 51 having an axis parallel to the moving direction of the casing 30.
It has a plurality of pairs of step portions 71 formed symmetrically with respect to each other on both sides, and each step portion 71 is parallel to the reciprocating rod 51 and the axis. The multistage stopper 70 has a shape in which a plurality of disk-shaped stopper rings 72 having stepwise different outer diameters are stacked coaxially, and the outer peripheral surface of each stopper ring 72 constitutes a step portion 71. With the distal ends of the movable members 40 expanded by the expansion cylinder device 41, the multi-stage stopper 70 is moved in the axial direction by the selection device 50 to select a predetermined pair of step portions 71a, and the distal ends of each movable member 40 are expanded. After being positioned at the axial position corresponding to the abutment 40b, the expansion cylinder device 4
1 is inoperative, the movable member 40 is closed by the return spring 48 (see FIG. 3), and the abutment element 40b at the tip abuts the predetermined step 71a in a substantially perpendicular direction to move the movable member 40 to a predetermined reference position. to hold.

The selection device 50 selects a predetermined pair of step portions 71a from the plurality of pairs of step portions 71 of the multi-step stopper 70,
As shown in FIGS. 1 and 2, a reciprocating rod 51 supported by the upper member 32 so as to be able to move only axially and having a cam groove 51a, a rotary plate 56 having a pin 56a engaged with the cam groove 51a, and a ratchet mechanism. 5
The rack 52 and pinion 53 drive a rotary plate 56 via a rack 52 and a pinion 53. As shown in FIG. 2, the piston-shaped rack 52
A pinion 53 is located in a cylinder 54 formed in the cylinder 54 and closed at both ends by plugs 55, and is reciprocated by applying working fluid pressure alternately to the working chambers on both sides, and is rotatably provided on the advance/retreat rod 51. Rotate back and forth. This reciprocating rotation causes the rotary plate 56 to rotate in one direction intermittently due to the cooperative action of the ratchet mechanism 57 and the return spring 60, and this rotation is caused by the cooperative action of the cam groove 51a and the pin 56a of the reciprocating rod 51. Provides intermittent axial movement. A nearby switch 58 provided on the upper member 32 and a dog 5 provided on the rotating plate 56
6b, the rotating plate 56 is stopped at a predetermined position, and the plurality of steps 71
1a is selected and the abutment 40b at the tip of the movable member 40
It is positioned at an axial position corresponding to. After reaching the uppermost position, the reciprocating rod 51 returns to the lowermost position by the return portion 51b of the cam groove 51a and the return spring 59, and then rises again intermittently. A collection chuck 61 is provided at the intermediate portion of the forward/backward rod 51, and when the forward/backward rod 51 is stopped, the return spring 63 locks the collection chuck 61, and when the forward/backward rod 51 is pivoted, the collector cylinder device 62 is operated. to release the lock status. This selection device 50 causes the collection chuck devices 61 to 63 to move the multi-stage stopper 70 to the casing 3.
This constitutes a positioning device for positioning at a predetermined axial position with respect to zero and holding the position at that position.

As shown in FIG. 4, the first movable table 14 supporting the support table 17 having a plurality of masters 80 (only one is shown) is connected to the guide rod 18 and the first cylinder provided on the fixed table 11 on the bed 10. A support 16 that reciprocates in the front-back direction by a support 19 and suspends and supports a casing 30 of the dimension measuring device is a second moving table 15.
The second movable base 1 is reciprocated in the vertical direction by a guide rod 22 provided at
5 is reciprocated in the left-right direction by a guide rod 20 and a second cylinder 21 provided on the column 12 above the bed 10.

Next, the operation of this embodiment will be explained. A control device (not shown) first operates the expansion cylinder device 41 to position the probe 46 inside, unlocks the collection chuck 61, and then operates the positioning device 50 to position the probe 46 on the mounting base 13. After selecting a predetermined pair of step portions 71a corresponding to the object W to be measured and positioning them in the axial direction and locking the movement of the multi-stage stopper 70 with the collection chuck 61, the expansion cylinder device 41 is deactivated and the contact device is turned off. 48
, each contact element 40b is connected to a predetermined pair of step portions 71a.
and holds each movable member 40 at a reference position corresponding to the object W to be measured. Next, the control device operates the first and second cylinders 19 and 21 to position the casing 30 coaxially with the master 80 corresponding to the object W on the mounting base 13, and then the third cylinder 23
The casing 30 is lowered and the probe 46 at the tip of the lever 42 is inserted into the master 80 to perform mastering. In this state, the support springs 44 and 45 are slightly bent and the tip 46 of each probe 46
b comes into contact with the inner circumferential surface of the master 80, and the detector 47a of each detector 47 is also displaced to measure the inner diameter of the master 80 and store the value electrically. Next, the casing 30 is raised by the third cylinder 23 and extracted from the master 80, and the first cylinder 19
The support stand 17 is moved back so that it does not interfere with the measurement. Thereafter, the second cylinder 21 positions the casing 30 coaxially with the predetermined measurement hole Wa of the measurement object W carried onto the mounting base 13, and the third cylinder 23 lowers the casing 30, so that the lever 42 at the tip Insert the probe 46a into the measurement hole Wa, and press the tip 46 of each probe 46.
a to the inner circumferential surface of the measurement hole Wa and connect each detector 4.
The detector 47a of No. 7 is displaced to measure the inner diameter of the measurement hole Wa based on the previously stored inner diameter dimension of the master 80.

When inserting the measuring element 46 into the measuring hole Wa, the guide member 49 and the measuring element 46 may be slightly impacted by the object W to be measured.
, and a force may be applied to the movable member 40 via the lever 42. However, this force is applied to the multi-stage stopper 70 via the stepped portion 71, and the direction thereof is substantially perpendicular to the axial movement direction of the multi-stage stopper, so that no force is generated to move the multi-stage stopper in the axial direction.

If the same inner diameter is to be measured successively, the measurement is performed as is; if a different inner diameter is to be measured, the reference position of the movable member 40 is changed in the same manner as described above, and the measurement is performed after mastering.

Although the above embodiment is an example of measuring the inner diameter, the present invention is not limited to this, and if changes such as making the tip 46a of the measuring element 46 face inward and moving the movable member 40 in the opposite direction, the inner diameter can be measured. It can also be used to measure diameter.

In the above embodiment, the probe 46 is connected to the lever 4.
2, each movable member 40 is also extended below the first support spring 43, and a measuring element 46 is elastically supported at the lower end of each movable member 40. Measuring element 46 and movable member 40
A detector 47 may be provided between each of them. Further, in the above embodiment, the movable member 40 was opened and closed by swinging, but it may be opened and closed by parallel movement.

[Brief explanation of drawings]

1 to 4 show an embodiment of the dimension measuring device according to the present invention, FIG. 1 is a longitudinal sectional view of the dimension measuring device of the present invention divided into upper and lower parts at the center, and FIG. 1, FIG. 3 is a cross-sectional view of FIG. 1, and FIG. 4 is a drawing showing related peripheral devices of the dimension measuring device of the present invention. Explanation of symbols, 13...Mounting base, 30...Casing, 40...Movable member, 46...Measuring head, 46a
... Tip, 47 ... Detector, 48 ... Contact device,
50... Selection device, 70... Multi-stage stopper, 71
...Danbe.

Claims (1)

[Claims] 1. A casing that is supported so as to be movable forward and backward relative to a mounting base that supports a measurement object, and a casing that extends substantially parallel to the direction of movement of the casing and that can be opened and closed in a direction that is substantially orthogonal to the direction of movement of the casing. at least one pair of movable members supported by the casing;
A pair of probes are elastically supported by each of the movable members so as to be able to approach and separate from each other with their tips facing the orthogonal direction, and a relative displacement between each probe and each of the movable members is detected. In the dimension measuring device equipped with a pair of detectors, a multi-stage stopper supported by the casing so as to be movable along an axis parallel to the advance/retreat direction exactly in the middle of each of the movable members, and a multi-stage stopper on both sides of the multi-stage stopper. a plurality of pairs of stepped portions formed symmetrically with respect to the axis, each pair substantially parallel to the coaxial line, and each pair having a different width;
a positioning device that moves the multistage stopper along the axis, selects a predetermined pair from the plurality of pairs of step portions, positions it at a predetermined axial position relative to the casing, and holds it at that position; The device is characterized by comprising a contact device that abuts mutually corresponding portions of each of the movable members from the orthogonal direction to the pair of stepped portions positioned in this manner to hold the movable members in a predetermined position. Dimension measuring device.