JPH0511447Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that measures dimensions such as inner and outer diameters over a wide range and with high precision using a two-point method.

With the spread of digital scales and their increasing precision, various measuring devices using scales have been developed. Figure 2 shows an example of a conventional two-point outer diameter measuring device.
a first contactor 2 located in the diametrical direction XX;
The outer diameter is measured over a wide range by the second contact 3 which faces this, but the first contact 2
is attached to a shaft 4 movable in the X-X direction, and the second contactor 3 is attached to an L-shaped lever 5 fixed to a plunger 6 so that the plunger 6 moves parallel to the X-X line. An arm 7 is provided perpendicularly to the plunger 6 so that its tip is located on the X-X line, and a scale 8 is mounted on the shaft 4.
A reading head 9 is provided at the tip of the arm 7, and the distance between the first and second contacts 2, 3 when they contact the outer periphery of the object 1 to be measured is read and detected as the outer diameter dimension. This is, for example,
This is the device shown in 56805. By the way, in this mechanism, the plunger 6 having the L-shaped lever 5 is connected to the shaft 4 moving on the X-X line.
It is necessary to move parallelly over a wide range, but this requires time and effort in processing, assembly, and adjustment.
However, it is very difficult to achieve this, and if there is even a slight play in the sliding part of the plunger 6, the position of the reading head will shift and cause errors, resulting in wear and tear.
There were problems such as unavoidable deviations over time due to deformation, etc., and high precision measurements over a wide range could not be expected.

In addition, the dimension measuring device disclosed in Japanese Patent Application Laid-open No. 144705/1985 has two detectors disposed on both sides passing through the central axis of the object to be measured.
The plunger of each detector is provided with first and second contacts. Then, the object to be measured is held between the first and second contacts, and the amount of movement of the plunger of each detector is detected by two scales and a reading head to measure the outer diameter of the object to be measured.

This dimension measuring device can measure a wide range of objects because the left and right plungers move.
Furthermore, since it is a device based on Atspe's principle, it has excellent measurement accuracy.

However, since the detectors are provided on the left and right sides, there is a problem in that the device becomes large and the places where it can be used are limited. Furthermore, in order to satisfy measurement accuracy, this dimension measuring device requires that the left and right scales be arranged coaxially. However, there is a problem in that it is difficult to arrange the divided left and right scales coaxially.

Further, Japanese Patent Application Laid-Open No. 144705/1983 discloses the following dimension measuring device. That is, the dimension measuring device includes a box-shaped case, and two sliding holes are formed in the side wall of the box-shaped case that does not face the object to be measured, into which a circular, slidable intermediate shaft is mounted.
L-shaped measuring shafts are slidably fitted in the axial direction of these intermediate shafts, and first and second contacts are provided at the tips of the two L-shaped measuring shafts, respectively. . A scale and a reading head are attached to each of these measurement axes.

This dimension measuring device can measure a wide range of measurement objects because the first and second contacts can each move, and can also be made more compact. However, in this dimension measuring device, the object to be measured and the scale are not arranged on a straight line in the direction of the measurement axis, so it does not comply with Atpe's principle. Therefore, there is a problem that highly accurate measurement cannot be performed.

The present invention was developed in view of these circumstances, and is capable of high-precision measurement over a wide range.
The object of the present invention is to provide a wide range dimension measuring device that can be made compact and easy to manufacture.

In order to achieve the above object, the present invention is a dimension measurement method that measures dimensions such as the inner and outer diameters of the object by bringing first and second contactors arranged on the same axis into contact with the object. In the device, the rod-shaped guide member is provided with a guide surface parallel to the axial direction, the rod-shaped guide member is movably provided in the casing via the guide surface, and the first guide member is provided at an end protruding from the casing. a guide member provided with a contact; a slider member provided movably along the guide surface and provided with the second contact at an end protruding from the casing; a moving means for moving along the guide member, and a biasing means for biasing the guide member in the direction of the first contact;
a moving force transmitting means that is connected to the guide member and the slider member and converts a force that moves the slider member toward the second contact into a force that moves the guide member in the opposite direction to the first contact; A scale provided on one of the guide member and the slider member, and a reading head provided on the other of the guide member and the slider member to face the scale and read the scale, wherein the guide member and the slider member are provided with a scale. move in the axial direction along the guide surface and move in opposite directions to move the first and second contacts in the opening/closing direction on the axis.

According to the present invention, the rod-shaped guide member having the first contact is provided so as to be movable in the axial direction via the guide surface, and the slider member having the second contact is movable along the guide surface. It is set in. Further, when the guide member is urged in the direction of the first contact by the urging means and the slider member is moved in the direction of the second contact by the moving force transmitting means, the guide member engages with the first contact. receives a force that moves in the opposite direction.

Accordingly, when the slider member moves, the guide member moves in the opposite direction to the moving direction of the slider member, so that the first and second contacts move in the direction of opening and closing on the axis. Therefore, a wide range of measurement targets can be measured.

In addition, in this case, the slider member and the guide member move along a common guide surface, and since the guide member is provided with a linear scale, the measurement target and the scale are arranged in a straight line in the measurement axis direction. Thus, it is possible to create a configuration that conforms to Atpe's principle. Therefore, highly accurate measurement is possible and measurement errors can be reduced.

Furthermore, since the guide member and the slider member having the first and second contacts can be disposed on one side of the object to be measured, the apparatus can be made more compact.

Furthermore, since the slider member and the guide member are configured to move along a common guide surface,
The scale and reading head can be easily positioned during manufacturing.

An embodiment in which the present invention is utilized for outer diameter measurement will be described below with reference to the drawings. FIG. 1 is a side view showing a portion thereof in cross section. As shown in the cross section of FIG. 3, the guide member 10 provided on an extension of the shaft 4 has a V-groove 15 that serves as a reference guide surface formed in the longitudinal direction, and a ball 14 is interposed in the V-groove 15.
Further, bearings 12 and 13 in which V grooves 16 are formed to receive the balls 14 are fixed to the casing 11, and the shaft 4 can accurately move in the X-X direction without rotating using the V surface as a reference guide surface. Only do the following. The L-shaped lever 5 having the second contact 3 inside is firmly supported inside the casing 11 via an intermediate member 20 by an arm 21 perpendicular to the casing 11 . The arm 21 is fixed to a slider 24 movable along the guide member 10 of the shaft 4 by bearings 22 and 23 at both ends. Bearing 22, 2
3 is exactly the same as the one shown in FIG. 3, and these V-groove guide surfaces are all machined with high precision, allowing the slider 24 to move in a straight line easily. ing. Further, a scale 25 is attached to the side surface (lower side in the figure) of the guide member 10 of the shaft 4, and a scale reading head 26 is attached to the middle part of the bearings 22 and 23 of the slider 24.
5.

Next, the opening/closing mechanism of the contacts 2 and 3 will be described. As shown in FIG. 1, a rod 29 is provided in the casing 11 in parallel with the guide member 10, supported by a bracket 28 and capable of sliding left and right in the figure. It is connected to the arm 21 via 30. A rack 31 is formed on a part of the outer circumference of the rod 29 in its axial direction, and the rotation of a motor 32 attached to the casing 11 is transmitted to the rack 31 by a mechanism including a pinion 33, etc.
9 to the left and right. In addition, in FIG. 1, pulleys 34, 35, 3 are provided at the right end of the casing 11.
A rope 37 for transmitting the opening/closing force of the contacts 2 and 3 is connected at one end to the guide member 10, passes outside the pulleys 34 and 36 as shown, and connects to the pulley 3.
The route goes from the inside of the slider 6 to the outside of the pulley 35, and the other end connects to the slider 2 via the tension spring 38.
It is connected to 4. And pulleys 34, 35,
36, rope 37, and tension spring 38 constitute a moving force transmitting means.

The operation of the embodiment of the present invention having the above-described configuration will be explained below.

When starting the measurement, the contacts 2 and 3 are expanded to a distance slightly larger than the maximum outer diameter to be measured. This is done by driving the rod 29 to the left in the figure by the motor 32 and pushing out the L-shaped lever 5 with the contact 3 to the farthest position, but at the same time the slider 24
The guide member 10 also moves to the left by the same distance along the guide reference V surface 15, so the guide member 10 receives the tensile force of the rope 37 and moves the guide member 10 toward the slider 2.
Move to the right by the same amount as 4. rod 2
9 reaches the leftmost end, the rotation of the motor 32 is stopped by, for example, hitting a limit switch provided at an appropriate location, and the horizontal movement of the rod 29 and guide 10, that is, the expansion operation of the contacts 2 and 3 is completed. do.

Next, the measuring device or the object to be measured is moved so that the contacts 2 and 3 are correctly positioned in the direction of the diameter of the object to be measured, and the master adjustment is first performed. This is similar to normal master alignment, in which a master or a workpiece 39 with known dimensions is held between the contacts 2 and 3, and the display on a display (not shown) is aligned with the master dimensions, but if the dimension to be measured is zero. If the measurement is made with the display when the contacts 2 and 3 are in contact as zero, the master is not necessary. The measurement operation of the object to be measured is performed in almost the same manner as the master alignment. In these cases, in order to narrow the distance between the contacts 2 and 3 and bring them into contact with the diameter position to be measured, the motor 32 is started and the rod 29 is moved to the right in FIG. Since the left end of the rod 29 is connected to the arm 21 via the spring 30, the intermediate member 20 to which the arm 21 is fixed, and the L-shaped lever 5
simultaneously receives a pulling force in the right direction. Then, the slider 24 moves to the right along the reference guide V surface 15 of the guide member 11. At this time, the tension of the spring 38 of the connecting rope 37 is lost, so the guide member 10
0 moves leftward using the V-groove surface 15 as a guide. In this way, the contacts 2 and 3 are connected to the motor 32.
The object to be measured is approached by the same amount at a time by the drive of the object to be measured. The displayed value at this time is the deviation value from the master dimension. In this embodiment, since both the contacts are movable, the rod 29 and the contact 2,
The stroke of No. 3 may be 1/2 of the diameter difference to be measured, that is, an amount equivalent to the radius difference, which is advantageous for simplifying the mechanism. Further, the rotation or stop of the motor 32 when the contacts 2 and 3 come into contact with the surface to be measured is controlled by, for example, a torque meter for the motor, and the repulsive force of the compression spring 30 for applying the measuring force. When the torque of the motor reaches a predetermined value or more, a means is used to shut off the motor.

Regarding the opening/closing mechanism of contacts 2 and 3, please refer to 2.
Other known techniques may be used, such as providing sets of motors, ropes, and pulleys, and using one set for expansion and the other set for proximity, or using a cylinder-piston drive method instead of a motor. You can also do it by leaning.

In addition, in the case of measuring the inner diameter, a measuring element is provided at the tip of the shaft 4 and the L-shaped lever 5, bent downward from the plane of the paper in FIG. In order to adapt to Atsube's principle, it is possible to use a probe that is bent in a U-shape in the upper direction, the horizontal direction, and the lower direction.

The measuring device of the present invention is not limited to inner and outer diameters, but can be used to measure items such as thickness, width, spacing, and groove width that can be measured by opening and closing at least two contacts. It can be done.

As detailed above, in this invention, the first
Since the structure is such that the reference guide surface for the opening/closing movement of the contact can be shared as the guide surface for the second contact, play between the guide and the moving part is reduced compared to conventional devices in which both contacts have individual guides. , it is possible to obtain a measuring device that has few causes of errors such as deviations in the parallelism of both guides, is easy to process, assemble, and adjust, and is advantageous in simplifying and downsizing the mechanism. Since it is a compliant device, it is extremely effective, especially for high-precision measurements over a wide range.

In addition, multiple steps (for example, 0
~25mm, 25~50mm, 50~75mm...), and within the same measurement range, 1
Excellent effects can be obtained, such as making it possible to measure different dimensions with just one master adjustment.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part including a partial cross section showing an embodiment of the outer diameter measurement of the present invention, Fig. 2 is a side view of the main part of a conventional outer diameter measuring device, and Fig. 3 is the same as Fig. 1. - line sectional view of. 2, 3...first and second contacts, 4...shaft, 5...
...L-shaped lever, 8,25...Scale, 9,26
...reading head, 10...guiding member, 12,1
3, 22, 23...Bearing.

Claims (1)

[Claims for Utility Model Registration] First and second contactors arranged on the same axis are opened and closed on the axis to contact the object to be measured, and measure the dimensions such as the inner and outer diameters of the object to be measured. In the dimension measuring device, the rod-shaped guide member is provided with a guide surface parallel to the axial direction, and is movably provided in the casing via the guide surface, and has an end protruding from one side of the casing. a guide member having the first contact provided thereon; and a guide member disposed within the casing and movable along the guide surface, from one side of the casing provided with the first contact. a slider member having the second contact provided on a protruding end thereof; a driving means for moving the slider member along the guide surface; and urging the guide member to move the first contact in the closing direction. an urging means for urging; and when the slider member is moved in the opening direction of the second contact by the driving means, the first contact moves in the opening direction against the urging force of the urging means; a moving force transmitting means for connecting the guide member and the slider member such that when the slider member is moved in the closing direction of the second contact by the means, the first contact is moved in the closing direction by the urging force of the urging means; , a scale provided on one of the guide member or the slider member, and a reading head provided on the other of the guide member or the slider member to face the scale and read the scale, and the drive means reads the scale. By moving the slider member in the axial direction, the first and second
A wide range dimension measuring device, characterized in that a contactor is moved in an opening/closing direction on the axis.