JPH0321442Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a screw type dial gauge with a swinging measuring element, and particularly relates to a screw type dial gauge used in combination with, for example, a height gauge.

[Background technology and its problems] A screw-type dial gauge is combined with a height gauge, three-dimensional coordinate measuring machine, etc. to measure the inner width of the concave part, the outer width of the convex part, and the diameter of the hole of the object to be measured. is being measured.

FIG. 1 shows a case where a screw type dial gauge 1 is combined with a height gauge 4 to measure the inner width dimension of a recess 11 of an object 10 to be measured. The measuring stylus 2 of the dial gauge 1 swings in both forward and reverse directions (both up and down in FIG. 1), and in accordance with this swing, the pointer 3 rotates in the forward and reverse directions. A spherical portion 2A is provided at the tip of the probe 2 that contacts the object 10 to be measured. height gauge 4 is 2
It is equipped with a slider 7 that moves up and down guided by the book posts 5 and 6, and as the slider 7 moves up and down, the distance it moves up and down from the rack part 6A of the support post 6 is read by a gear type reading mechanism inside the slider, and the distance is read in 1 mm increments. The above vertical movement distance is displayed digitally on the display section 8, and the vertical movement distance in units of 1 mm or less is displayed in analog form on another display section 9.

In the illustration, there are two display sections 8A and 8B, but the upper display section 8A is for displaying the rising distance when the slider 7 rises, and the lower display section 8B
is for displaying the descending distance when the slider 7 descends. The direction of rotation of the pointer 9A of the display section 9 is reversed when the slider 7 is raised and lowered, and its reading direction is also reversed.

The screw type dial gauge 1 is combined with the height gauge 4 by being attached to the slider 7 at the attachment portion 7A of the slider 7. When measuring the inner width dimension l ₁ of the recess 11 of the object to be measured 10, first, the slider 7 is gradually lowered, the spherical tip 2A of the measuring stylus 2 comes into contact with the lower surface 11A of the recess 11, and the pointer 3
Stop the slider 7 at the height position just before it moves,
The display parts 8 and 9 should be based on the height position at this time.
Set to zero. Then raise the slider 7,
This allows the screw type dial gauge 1 to be connected to the object to be measured 1.
0, the tip spherical portion 2A of the measuring stylus 2 comes into contact with the upper surface 11B of the recess 11, and the slider 7 is stopped at the height position immediately before the pointer 3 moves in the same manner as above. Then, the values on the display sections 8 and 9 at this time are read.

The measured length l ₂ can be found in this way
is the rising distance of the slider 7, and this length l ₂ is shorter than the actual inner width dimension l ₁ of the recess 11 by the diameter of the spherical portion 2A. For this reason, in the past, it was necessary to correct the diameter of the spherical portion 2A to the numerical values read on the display sections 8 and 9 of the slider 7, which required a correspondingly troublesome work.

[Purpose of the invention] The purpose of the invention is to display the actual dimensions of recesses, etc. of the object to be measured on the display section of a height gauge, etc.
An object of the present invention is to provide a screw-type dial gauge that eliminates the need for correction regarding the diameter of the spherical portion of the measuring head.

[Means and effects for solving the problem] Therefore, the configuration of the present invention is such that the gauge head is swingable in both forward and reverse directions, and the tip of the gauge head is provided with a spherical part that comes into contact with the object to be measured. , a screw type dial gauge that moves relative to the object to be measured by being combined with a height gauge, etc., and is used to measure the distance between the contact points of the spherical part of the object to be measured by this relative movement, Marks are displayed at two pointer positions in both forward and reverse directions, and the interval between the two marks is made to correspond to the diameter of the sphere, so that the pointer is aligned with one of the marks before the relative movement starts, The feature is that by aligning the pointer with the other mark even after the relative movement is completed, the diameter of the spherical portion of the probe can be added in advance to perform measurement work.

[Example] FIG. 2 shows a screw type dial gauge 21 according to this example. The gauge head 22 of the dial gauge 21 can swing in both forward and reverse directions (in both left and right directions in Fig. 2) from its resting position when no load is applied. A spherical portion 22A made of material is provided. When the probe 22 swings due to contact of the ball portion 22A with the object to be measured, the pointer 23 rotates forward or backward depending on the direction of the swing.

On the scale plate 24 of the screw-type dial gauge 21, line-shaped marks 25 and 26 are displayed at two positions, a forward rotation position and a reverse rotation position of the pointer 23. The distance between these marks 25 and 26 corresponds to the diameter D of the spherical tip portion 22A of the measuring stylus 22. To be more specific, as shown in FIG.
The mark 26 is displayed in the forward rotation position where the pointer 23 swings when the pointer 23 is swung in the forward direction by the same amount, and as shown in FIG. When the pointer 23 is swung to
is displayed in the reverse rotation position where it swings.

By doing this, two marks 25 and 26 are distributed in both forward and reverse directions with the neutral position of the pointer 23 when the measuring head 22 is stationary as the center.
The interval between these marks 25 and 26 corresponds to the diameter D of the spherical portion 22A.

The display position determination work for the marks 25 and 26 described above is performed as follows, by way of example.

The screw type dial gauge 21 is attached to a movable member of a measuring device such as a height gauge. While bringing the spherical portion 22A of the measuring head 22 into contact with a fixed block as a reference member, the movable member is adjusted to the radius D/2 of the spherical portion 22A.
The display positions of the marks 25 and 26 are determined from the position of the pointer 23 by moving in the forward and reverse directions. Next, the direction of the dial gauge 21 is reversed, and the movable member is moved by a radius D/2 of the ball portion 22A to the opposite side from when the display positions of the marks 25 and 26 were determined, so that the position of the pointer 23 at this time is Check whether it matches the marks 25 and 26. If they match, the position determined above is determined as the final mark display position. If there is a deviation, there is an error caused by the moving direction of the movable member in the measuring instrument, so in order to reduce the influence of this error, the position determined above is moved by half the amount of the deviation. As described above, the display positions of the marks 25 and 26 are determined.

When measuring the inner width dimension of the recess 11 of the object to be measured 10 shown in FIG. 1, a screw type dial gauge 21 is attached to the mounting member 7A of the height gauge 4. The slider 7 of the height gauge 4 is gradually lowered to bring the tip spherical portion 22A of the measuring element 22 into contact with the lower surface 11A of the recess 11. After this contact, the slider 7 continues to be lowered, thereby causing the pointer 23 of the screw type dial gauge 21 to swing.
When the slider 3 rotates to the mark 26, the slider 7 completes its descent and is held at that height position that should serve as a reference, and the display sections 8 and 9 are zero-set. This height position is lower by the radius D/2 of the ball portion 22A than when a conventional screw type dial gauge is used. Next, by raising the slider 7, the dial gauge 21 is moved relative to the object to be measured 10, and the tip ball portion 22A of the measuring stylus 22 is brought into contact with the upper surface 11B of the recess 11. After this, the slider 7 continues to rise to cause the pointer 23 to swing, and when the pointer 23 coincides with the mark 25, this rise is stopped. The height position of the slider 7 at this time is a position higher by the radius D/2 of the spherical portion 22A than when a conventional screw type dial gauge is used. Therefore, the values displayed on the display sections 8 and 9 of the slider 7 include the diameter D of the spherical section 22A.
The inner width l ₁ of the recess 11 is displayed on the display sections 8 and 9. Therefore, there is no need to correct the diameter D of the spherical portion 22A.

In the above, the rotatable scale plate 24 of the screw type dial gauge 21 may display, together with the marks 25 and 26, a mark indicating the neutral position of the pointer 23 when the measuring stylus 22 is stationary. Further, as shown in FIGS. 2 and 3, this scale plate 24 may be provided with a scale 24A in the same way as a normal screw-type dial gauge. According to this, the dial gauge 21 can be replaced with a normal screw-type dial. It can also be used as a game. Further, the locations where the marks 25 and 26 are displayed are not limited to the scale plate 24, but may be displayed on a dust-proof transparent plate that rotates together with the scale plate 24 and covers the upper part of the pointer 23. In addition, in this embodiment, two marks 25, 2
6 was equally distributed in both the forward and reverse directions from the neutral position of the pointer 23 by the radius D/2 of the spherical portion 22A, but as a result, the two marks 25 and 26 were located at both the forward and reverse positions of the pointer 23, and the distance between them was measured. Ball part 22 of child 22
It suffices if it corresponds to the diameter D of A.
This also provides the same effects as described above.

Furthermore, although the above explanation is for the case where the screw type dial gauge 21 is combined with the height gauge 4, depending on the type of object to be measured, the screw type dial gauge 21 may be combined with other measuring equipment, such as a three-dimensional coordinate measuring machine. It is also possible to combine them, and the measuring point of the object to be measured can be arbitrary, such as concave portions, convex portions, holes, etc. If necessary, by moving the screw type dial gauge with respect to the object to be measured, The present invention can be applied to any device that measures the distance between contact points of a spherical part. Further, although the above explanation was for the case where the object to be measured was fixed and the screw type dial gauge was moved, the present invention can also be applied to the case where the screw type dial gauge is fixed and the object to be measured is moved. If necessary, the screw type dial gauge may be moved relative to the object to be measured.

[Effects of the invention] According to the invention, there is no need to correct the diameter of the spherical portion of the measuring head, which contributes to simplifying and speeding up the measurement work.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a case in which a screw type dial gauge is used in combination with a height gauge to perform measurement work, Fig. 2 is a front view showing a screw type dial gauge according to an embodiment of the present invention, and Figs. B is a diagram showing a case where the display position of a mark is determined. DESCRIPTION OF SYMBOLS 10... Object to be measured, 21... Screw type dial gauge, 22... Measuring head, 22A... Ball part, 23... Pointer,
25, 26...mark.

Claims (1)

[Scope of utility model registration request] A spherical part that contacts the object to be measured is provided at the tip of the probe that can freely swing in both forward and reverse directions, and by moving relative to the object, the distance between the contact points of the spherical part of the object to be measured can be adjusted. On the screw-type dial gauge used for measurement, marks are displayed at the two pointer positions in both the forward and reverse directions.
A screw type dial gauge characterized in that the intervals between the two marks correspond to the diameter of the sphere.