JPS63177001A - Apparatus for measuring cylindrical object - Google Patents

Abstract

PURPOSE:To simultaneously and rapidly measure inner and outer diameter dimensions, a wall thickness or an out of roundness by a simple operation, by arranging the first and second arms in an almost parallel state and respective mounting contact elements to one end parts of said arms. CONSTITUTION:The first and second arms 101, 104 are mutually arranged in an almost parallel state and contact elements 101a, 104a are mounted to one end parts near to a support shaft 100 and a pin 103 of said arms. At first, a part becoming a model is mounted so as to straddle rollers 107, 108 and the contact elements 104a, 101a are inserted in the part to be brought into contact with the inner peripherals surface thereof and the scales of dial gauges 105, 106 are matched with zero. Subsequently, the part is replaced with a bush to be measured and the contact elements 101a, 104a are set in the same manner to rotate the bush. By this method, the measuring elements 105a, 106a of the gauges 105, 106 are displaced and the inner diameter dimension of the bush is cleared from the designated scale of the gauge 105 and, when the scale varies, the max. and min. inner diameter dimensions are measured from the max. and min. scales. The out of roundness of the inner diameter of the bush and the inner diameter dimension thereof at an arbitrary position are respectively obtained corresponding to the variation state of the designated scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dimension measuring device for a cylindrical object, which is improved so as to be able to simultaneously measure the dimensions of a cylindrical object, particularly the inner diameter and wall thickness.

[Prior Art] Traditionally, the machining dimensions of bearing bushes used in cylindrical objects, such as bearings that are automobile parts, have required precise measurement of inner and outer diameter dimensions, wall thickness dimensions, etc. to an accuracy of microns. There is. Therefore, when measuring the inner and outer diameter dimensions of a cylindrical object, it is necessary to carefully measure each piece one by one using commercially available micrometers for wall thickness and outer diameter, and a dial gauge for inner diameter cylinder.

[Problems to be solved by the invention] However, since the bush has an extremely thin wall and a cylindrical shape, it is difficult to measure, and it is time consuming and inefficient, and it requires a lot of skill to measure. There is an inconvenience that depending on the degree of measurement, a judgment error may occur in the judgment of the measured value.

[Purpose of the Invention] This invention was made to eliminate the above-mentioned problems, and its purpose is to determine the inner diameter dimension of a cylindrical object without causing an error in determining the measured value, regardless of skill level. An object of the present invention is to provide a dimension measuring device for a cylindrical object that can simultaneously and quickly measure the outer diameter dimension, wall thickness dimension, and roundness with simple operations.

[Means for Solving the Problems] The present invention provides a first arm that is arranged in parallel to a first arm;
a second arm pivotally supported by a support shaft such that both ends thereof are oscillated alternately in the direction of separation from the arm; and a second arm that is close to the support shaft of the first arm and the second arm. contacts provided at side ends so as to face each other;
A pivot mechanism that swingably supports the first arm and the second arm as a whole, and a pivot mechanism that is swingably provided at each tip of the first arm and the second arm contactor. , a row rod that is inserted into a cylindrical object as a measured object during measurement and inscribed in its inner peripheral surface, and between the ends of the first arm and the second arm on the side far from the support shaft. a first measuring tool that measures a distance displacement of the measured object as it rotates, and an overall rocking displacement of the first arm and second arm that is measured on the first arm side. and a second measuring tool.

[Function] According to the present invention, when measuring the wall thickness, inner diameter, and outer diameter, the roller of the contact is inserted into the cylindrical object (so that the simple operation of 'j is sufficient). Become.

[Effects of the Invention] According to the present invention, when measuring the wall thickness, inner diameter, and outer diameter, the simple operation of simply inserting the roller of the contact into the cylindrical object is sufficient. Therefore, it is possible to provide a measuring device that has excellent effects such as greatly improving work efficiency regardless of the level of skill, such as whether the user is used to it or not.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First, the principle underlying this invention will be described. As shown in FIG. 1a, a seesaw-type first arm 101 is swingably supported on a support shaft 100 erected on the installation surface.

A support plate 102 is integrally formed on the first arm 101, and a second arm 104 is supported on the support plate 102 via a pin 103 so as to be movable once. These first
The second arms 101 and 104 are arranged substantially parallel to each other, and contacts 101a and 104a are attached to one end near the support shaft 100 and pin 103.

Although not shown, the contacts 101a and 104a can be adjusted and moved toward or away from each other by an adjustment mechanism. In addition, the first arm 10
A dial gauge 105 is fixed to the right end of the dial gauge 1, and its gauge 105a is in contact with the second arm 104. Furthermore, another dial gauge 106 is fixed to the installation surface, and its gauge 106a is in contact with the first arm 101. When measuring the inner diameter and wall thickness of a cylindrical part such as a bushing, first, a model part whose inner diameter and wall thickness have been accurately measured is placed on a pair of rollers 107 and 108. Place it so that it straddles it. In this state, the contacts 104a and 101a are inserted into a cylindrical part serving as a model and brought into contact with the inner peripheral surface. At this position, set the dial gauges 105 and 106 to zero. Next, the cylindrical part serving as the template is replaced with the bush to be measured. Then, the contacts 101a and 104a are set in this bushing in the same manner as described above, and the bushing is rotated via rollers 107 and 108. Then, the first arm 10 changes depending on the state of the inner peripheral surface of the bushing.
1 makes a small rotation around the support shaft 100 as shown by the double-headed arrow X, and the 'XS2 arm 104 makes one full movement as shown by the similar arrow Y. This allows dial gauge 1
05.106 probe 105a106a is displaced, the inner diameter of the bushing can be determined by reading the scale indicated by the dial gauge 105, and if the scale changes,
The maximum and minimum internal diameter dimensions are determined by reading the maximum and minimum scales.

Further, in addition to obtaining the roundness of the inner diameter according to the fluctuation state of the scale indicated by the dial gauge 105, the inner diameter dimension at an arbitrary position can be measured.

Furthermore, since the wall thickness of the model bushing is accurately known in advance, the wall thickness of the bushing can be determined by reading the scale indicated by the dial gauge 106, and if the scale changes, the maximum The maximum and minimum wall thickness dimensions are measured by reading the minimum scale. Further, in addition to obtaining the deviation state of the wall thickness according to the fluctuation state of the scale indicated by the dial gauge 106, the wall thickness dimension at an arbitrary position can be measured. In this case, dial gauge 1
The reading scale of 05.106 is displayed enlarged several times according to the length of the arm, making it easier to read and improving measurement accuracy.

An embodiment of the present invention will be described based on such an inventive principle.

First, in Fig. 1, 1 is a surface plate installed in a horizontal state,
Reference numeral 2 denotes a support plate fastened to the surface plate 1 by bolts 4 via a block 3, and a horizontal plate 5 is mounted on the left side of the support plate 2 by both radial and thrust bearings 6.7. It is installed so that it can rotate within a horizontal plane around the bolt 1a.

The horizontal plate 5 is sandwiched between rollers 8.9 in a sand-like manner while contacting the upper and lower surfaces thereof. This roller 9 is rotatably supported by a support part 10 fixed to the support plate 2 with bolts 9a and 9b.
is connected to a vertically long connecting plate 11. Two bolts 12 and 13 are placed approximately perpendicular to this connecting plate 11.
The hook is passed over, and a connecting plate 11 is fixed at the center with a double nut. Vertically elongated leaf springs 14.15 are fixed to both ends of these bolts 12.13 by double nuts, and the lower ends of these leaf springs 14.15 sandwich both ends of the horizontal plate 5 while applying elastic force. . Therefore, when the horizontal plate 5 moves 41 ff'JI in the horizontal direction,
The rollers 8.9 eliminate displacement components other than the horizontal direction, making the rocking state smooth, and the action of the leaf springs 14.15 urges the horizontal plate 5 in the direction to return to its original position. The horizontal plate 5 is integrally connected to the first arm 16 at the right end so that the swinging motion of the horizontal plate 5 can be transmitted. As shown in FIG. 4, a bolt 18 is vertically provided on the upper surface of the surface plate 1 corresponding to the right end of the first arm 16, and a horizontal plate 19 is fixed to this with a double nut. ing. A support plate 22 is provided on both ends of the leaf spring 19 by bolts 20 and 21 via a spacer S. A roller 23 rotatably supported by the support plate 22 has its outer peripheral side in contact with the lower surface of the first arm 16 . As a result, the swinging motion of the horizontal plate 5 is transmitted to the first arm 16 and the swinging state becomes smooth, and an accurate amount of swinging can be obtained. A mounting member 201 having a keyhole-shaped opening 200 is fixed to the first arm 16, and a cylindrical portion of a dial gauge 202 as a first measuring tool is attached to the mounting member 201 through the opening 200. Insert the three bolts 203
By tightening, the diameter of the opening is reduced and the dial gauge 202 is fixed to the mounting member 201. A probe 202a from the cylindrical portion of the dial gauge 202 is positioned in contact with a second arm, which will be described later.

Now, reference numerals 24 and 25 are holding plates arranged to sandwich the left side of the horizontal plate 5 from above and below, and 26 is an elongated adjustment plate placed between the holding plates 24 and 25. 24.
It is supported rotatably in a horizontal plane by a support shaft 27 that passes through 25 vertically.

A bolt 28 is passed through the right end of the AM plate 26 across the horizontal plate 5 and tightened with a nut 28a. A coil spring 30 located between the adjustment plate 26 and the horizontal plate 5 and a head 29 for adjustment are attached to this bolt 28, and the head 29 is connected to the coil spring 3.
By moving the adjustment plate 26 in the screwing forward and backward directions with respect to the horizontal plate 5 through 0, the adjustment plate 26 is adjusted to rotate in the directions of arrows A and B about the support shaft 27 in FIG. Reference numeral 31 denotes a stop bolt, which passes through the clamping plates 24 and 25, and is inserted into a long hole formed in the adjustment plate 26 during the penetration, and is tightened with a nut 31a to set the adjustment plate 26 to a predetermined position. Fixed at rotational buying position.

32 to 34 are three contacts formed in the shape of an elongated plate, and one end of these back contacts 33 is attached to the holding plate 24.2.
5 and fastened to the left end of the adjustment plate 26 with two bolts 41 and 42.

In addition, the contacts 32.34 each have one end attached to the clamping plate 24.2.
They are fastened by two bolts 35 and 36 and bolts 35a and 36a from the outside of 5, respectively. The other end portions of these contacts 32 to 34 are aligned with each other and rotatably support rollers 38 to 40, with portions thereof respectively protruding outside. The aligned ends of the contacts 32 to 34 are pressed against each other by tightening bolts 37. At this time, the contact 33 is formed with a long hole 33a for correcting the insertion of the bolt 37, and the bolt 35, 36 and the poles 1-35a, 3
6a as well as bolts 4L and 42, the contact 33 is moved relative to the other contact 32, 34 by temporarily loosening the bolt 37, so that the rollers 38 to 40 are It allows it to be inscribed in a circle. Since these contacts 32 to 34 are fixed to the adjustment plate 26, when the adjustment head 29 is operated, the contactors 32 to 34 move in the direction of the arrow B around the support shaft 27 together with the adjustment plate 26.
rotate in the direction. Are these contacts 32 to 34 of dimension II1? A set of replacement parts is provided, which can be replaced as appropriate depending on the size of the object to be measured.

Now, 44 is an L-shaped arm, and this is a clamping plate 24.25
In between, a pivot mechanism 45 shown in FIGS. 5 to 7 is attached so as to be rotatable in the direction of arrow C and the direction of arrow C in a horizontal plane. This pivot mechanism 45 includes a grooved bolt 20 shown in FIG.
4 and nuts 20 fastened to both ends of this bolt 204.
5.206, Pol l ~ 204 and Chong II! ii! 4
A bearing 207 is provided between the two. Also, from the clamping plates 24, 25 there are threaded holes 208.
209 are drilled, and slotted bolts 212.2 are inserted into these screw holes 208.209 through balls 210.211.
13 are fastened, respectively, and screw nuts 214 and 215. Therefore, the tightening of the grooved bolts 212, 213 depends on the degree of tightening of the ball 210.
The pressure contact force of 211 can be adjusted. Accordingly, when the lever arm 44 swings around the bolt 204, the lever arm 44 slides on the balls 210 and 212, so that the swinging state becomes smooth.

A single-shaped moving plate 46 is fastened to the left end of the arm 44 by bolts 47 and 48. By loosening these bolts 47 and 48, the movement of the moving plate 46 can be adjusted, and as shown by arrows E and F, the moving plate 46 moves by a small amount relative to the object to be measured.
It is designed to be able to rotate in forward and reverse directions, respectively, with the number 45 as the central axis. This move! The other side of lJm46 is along the contacts 32 to 34, and the tip of the sixth
As shown in the figure, ring-shaped holding parts 46a and 46b are formed so as to slightly protrude relative to the object to be measured, and to face each other on the left side. Four are second contacts, which are arranged along the contacts 32 to 34 in the left-right direction. As seen in FIGS. 4a to 4d, this contactor 49 has an annular portion 49 having a keyhole-shaped through hole approximately in the center.
a is formed to be sandwiched between the holding portions 46a, and a semicircular contact portion 49b that protrudes outward in a semicircular shape is provided at the tip. A groove 49c is formed on the outer periphery of this contact portion.
A disc-shaped roller 40 is rotatably supported within 9C by a shaft 40a. In this state, a portion of the roller 4o slightly protrudes outside from the groove 49c. Pins are attached to the annular portions 49a of the four contacts and the holding portion 46a of the moving plate 46, so that the contacts 49 are attached to the moving plate 46, and the four contacts It is also possible to reciprocate around the bin 216 in the opposite direction of arrow G. In addition, the annular portion 49 of the four contacts
A bolt 52 is screwed onto a, and by tightening and loosening the bolt 52, the annular portion 49a expands and contracts in diameter, and the degree of tightening of the annular portion 49a against the bottle 216 can be changed. Roughly speaking, on the left side of the moving plate 46, there is a through hole 2.
17 and a screw hole 218 are formed in order from left to right, and the bolt 51b in FIG. 2 is screwed into the screw hole 49d on the right side of the contact 49 in FIG. The nut 219 brings the movable plates 46 and 49 into contact with each other in a pressed state, and the length of the threaded portion of the screw 51a screwed into the screw hole 218 of the movable plate 46 is longer than the depth of the screw hole 218. It's the length.

In this case, when the bolt 52 shown in FIG. 4a is loosened, the nut 219 is loosened, and the screw 51a is screwed in to the depth of the screw hole 218 or more. However, when the screw 51a is loosened and the nut 219 is tightened, the contact 49 moves in the direction of the arrow G.
rotate in the opposite direction.

As a result, the small amount of rotation vA of the contactor 49 is performed, and the distance dimension in the direction of approach and separation from the other contacts 32 to 34 is adjusted, so that it can be adjusted to match the inner diameter of the object to be measured. Further, this contactor 49 is prepared in different sizes like the other contacts 32 to 34,
It can be replaced as appropriate depending on the size of the object to be measured. Note that a screw 5 is attached to the ring-shaped holding portion 46a of the moving plate 46.
3 is screwed onto the pin 216, and by tightening this screw 53 against the pin 216, the fixed state of the contact 49 becomes firm.

Now, on the right side of the lever arm 44, a mechanism similar to that provided on the horizontal plate 5 is installed as shown in FIG. Similar to the horizontal plate 5, this mechanism has rollers 59a and 58a that sandwich the lever arm 44 from above and below, as shown in FIG. The roller 58a is rotatably supported by an elongated plate 220 that crosses above the arm 44.

This plate 220 is attached to the support plate 2 with bolts 5 through spacers p.
8.59 installed in the erection condition. This plate 220 includes an elongated connecting plate 22 that extends upward from the center.
1 is integrally formed, and two bolts 222 and 223 are fastened to the connecting plate 221 at right angles to each other by double nuts. These bolts 222.
At each end of 223 there is a vertically elongated spring plate 56.5.
7 are each tightened by double nuts, and spring plates 56 and 57 elastically sandwich both ends of the arm 44. With this configuration, when the arm 44 swings in the horizontal direction, the lever arm 44 moves along the O-ra 58a159a, so that a smooth swinging state is obtained, and the arm 44 is moved against the spring plate 56.57. Because they are sandwiched, unnecessary displacement components are absorbed and only accurate swing displacement components are extracted.

Further, the right end of the arm 44 is connected in parallel to the first arm 16 including a horizontal movable arm 54 by suitable attachment means such as a bolt. In this case, the first
Seven flanges 16a and 54a are bent at opposing side ends of the arm 16 and the movable arm 54. One end of the bolt 63 is fixed to the flange 16a with a double nut, and the other end is inserted into a hole 224 formed in the flange 54a, as shown in FIG. There is a part 65 that becomes the head of the bolt in the part where the bolt 63 passes through the hole 224, and two nuts 62 and 64 are attached by a double put in the part that exists between the flange 16a and the flange 54a of the bolt 63. Fixed. Therefore, the permissible swing range of the movable arm 54 is the distance range between the part shown by number 64 and the part shown by number 65, and by changing the fixed position of the part shown by numbers 62 and 64, the part 65 and the part shown by number 65 can be moved. The distance between the movable arm 54 and the movable arm 54 changes in size, and the allowable swing range of the movable arm 54 is adjusted as appropriate.

Next, 250 in FIG. 2 is a base located on the same plane as the surface plate 1, and a mounting member 252 is formed on this with blocks 251 stacked in a crank shape. This mounting member 252 has a right-end annular portion having a keyhole shape inside, and a cylindrical portion of a dial gauge 253 as a second measuring tool is inserted into this annular portion. In this state, by tightening the annular part in the diameter reduction direction with the bolt 254, the cylindrical part is fixed and the dial gauge 253 is attached. From the cylindrical part of this dial gauge 253, the measuring tip 2
53a protrudes, and its tip abuts against the flange 168 of the first arm 16.

Now, FIG. 8 shows a measuring object mounting device, in which a pair of rollers 256 and 257 are arranged at a predetermined distance apart from a base 255 that is inclined at a predetermined angle with respect to the horizontal plane. 258.258a is a mounting surface plate installed horizontally on the base 255, and on top of this is a mounting plate with height, shape, and width that has the optimal conditions for measuring cylindrical objects of various shapes. There is a surface plate 1 in Figure 1, to which this device is attached. Further, a dial gauge 260 is installed on a portion indicated by the number 258.258a via a stand 259, and a measuring point 261 of this dial gauge 260 is oriented horizontally. As shown in FIG. 8, 262 is a single-shaped screw that is rotatable at the bending point T, and the vertical portion 262a is brought into contact with the measuring tip 261, and the horizontal portion 262
A contact 263 is formed at b to be located between rollers 257 and 256.

Now, the measurement of the outer diameter, inner diameter, and wall thickness of a cylindrical object to be measured, such as a bushing that is an automobile part, will be described. Prior to this measurement, the roller 256, 257 of FIG.
Place it so that it is circumscribed by. At this time, row 5256.
Since the distance between rollers 257 and 257 is set to a predetermined value,
The line connecting the center of roller 257, the center of the bushing, and the contact 263 is a straight line, and the line connecting the center of the roller 257 and the center of the bushing is a horizontal line.

In this state, the contacts 32 to 34 and the four second contacts are placed in the model bushing. In this state, since the base 255 is inclined, the roller 2
57, the center of the roller 39 of the contactor 33 and the second
A line connecting the centers of the rollers 40 of the contacts 49 coincides with the horizontal line.

At this time, before the contacts 32 to 34 are attached to the adjusting plate 26 in FIG. The relationship is set so that it is temporarily inscribed on the inner peripheral surface of. Thereafter, by loosening the stop bolt 31 and rotating the two adjustment heads in a predetermined direction, the contactor 32 is removed together with the adjustment plate 26.
to 34 rotate slightly in the direction of arrow Bh about the part indicated by numeral 27 as a central axis, and the roller 39 of the contactor 33 accurately inscribes the inner peripheral surface of the pusher 1. Then, with the bolt 52 and screw 53 in FIG. 6 loosened, the bolt 51 in FIG.
b by loosening the nut 219, and then tightening the screw 51a so that the tip comes into contact with the right side of the contact 49.

As a result, the second contactor 49 rotates slightly in the direction opposite to the arrow G about the pin 216 in FIG. 6, so that the roller 40 is accurately inscribed in the inner circumferential surface of the bushing.

After this operation, the bolt 52 and screw 53 are tightened to hold the second contact 49 in the above-described position. In this state, dial gauge 202 and dial gauge 25
Adjust so that each indicator hand in step 3 points to the zero scale. At this time, since the contactor 263 shown in FIG. 8 is in a state of circumscribing the outer peripheral surface of the bushing, the dial gauge 260 is also adjusted to zero scale in the same manner as described above.

Upon completion of this operation, loosen the stop pole 1-31 in Figure 2 and rotate the two heads for mffJ to slightly move the contacts 32 to 34 in the six directions of the arrows around the part indicated by number 27. Rotate to separate the rows 38 to 40 from the inner peripheral surface of the bushing. At the same time, the bolt 52 in Fig.
Then, while loosening the screw 53, unscrew the screw 51a shown in FIG.
Screw 1b back. As a result, the second contactor 49 rotates slightly in the direction opposite to the direction of arrow G, and the roller 40 separates from the inner peripheral surface of the bushing. In this state, the model bushing is pulled out from the contacts 32 to 34 and the four second contacts and replaced with a bushing 300 to be measured (hereinafter referred to as a measurement bushing). In this state, the contacts 32 to 34 as well as the roller 38 of the second contact 49 and the two rollers 3 are inserted into the measuring bush 300 by the same procedure as above.
9 is placed so as to be inscribed in the measurement bush 300.

By rotating the rollers 256 and 257 in this state, the measuring bush 300 receives rotational force and rotates. At this time, if the dimensions of the measurement bushing 300 are different from those of the model bushing, the contacts 32 to 34 and the second contact 49 may be slightly displaced in the contact/separation direction depending on the inner surface condition of the measurement bush 300. Then, the second arm 54x including the movable arm 54 slightly swings relative to the first arm in a direction toward and away from the first arm as shown by the arrow C or the arrow 45 as the central axis. Along with this, the first
The second arm 7 as a whole slightly swings in the directions of arrows H and 1 in FIG. 2 about the bolt 1a. 1st
Due to the swinging of the arm 16, the measuring element 202a in the lower right of FIG.
When the pointer of the dial gauge 202 is displaced positively or negatively through the , and remains stationary in this state, this value is added to determine the inner diameter dimension of the measuring bush 300 .

In addition, when the indicator needle of the dial gauge 202 swings between positive and negative, the maximum and minimum inner diameter dimensions of the measuring bushing 300 can be obtained by reading the maximum and minimum swing amounts, respectively. You can also check whether the dimensions are within the allowable size range. Further, since the rollers 39 and 40 are always inscribed in the inner peripheral surface of the measuring bushing 300, the inner diameter dimension at any position of the measuring bushing 300 can be obtained. In this way, since the inner diameter dimension at any position is known, the roundness of the inner circumferential surface of the measurement bushing 300 can also be measured.

Furthermore, especially since the roller 39 of the contactor 33 in FIG. ■With the oscillating displacement in the direction,
When the measuring point 253a of the dial gauge 253 is displaced in the advance/retreat direction and the indicator needle comes to rest at a positive or negative position, the wall thickness dimension is calculated by adding that value to the wall thickness dimension of the model bushing. be able to.

When the indicator needle of the dial gauge 253 swings from positive to negative, the maximum and minimum wall thickness dimensions of the measurement bushing 300 can be obtained by determining its maximum and minimum values. Accordingly, it can be confirmed whether the wall thickness of the measurement bushing 300 is within the allowable range. Furthermore, the roller 39 of the contact 33 is connected to the measuring bush 300.
Since it is always in contact with the inner circumferential surface of the wall, it is possible to measure the wall thickness at any position.

In addition, in the above embodiment, the dial gauge 260 is provided as shown in FIG. 8, and its contact 263 is in circumscribed contact with the outer peripheral surface of the measuring bushing 300. By reading the amount of rocking displacement of the indicator needle 260, the outer diameter dimension, the roundness of the outer circumferential surface, and the maximum and minimum values of the outer diameter dimension of the measurement bushing 300 can be obtained, respectively.

When measuring with the measuring pusher 1300, the reading on the dial gauge is magnified by a magnification according to the length of the arm, making it easier to read the scale of the dial gauge and improving measurement accuracy. Moreover, especially in the above embodiment, the distance between the dial gauge 202 and the dial gauge 253 is
Since the distance is set to be equal to the distance between 45, which is the pivot axis of the arm, and the bolt 1a, which is the pivot center of both the first and second arms, when measuring the inner diameter and wall thickness dimensions of the measurement bushing 300, the dial The 202.253 indicator needle of the gauge now shows a scale with the same/- magnification, which is convenient for equalizing the inner diameter and wall thickness dimensions.

Thus, according to the above configuration, the inner diameter and wall thickness of the measuring bushing 300 can be measured simultaneously, and for this measurement, simply inserting the contacts 32 to 34 and the second contact 49 into the measuring bushing 300. It is relatively simple to operate, and work efficiency is significantly improved.
Rapid measurement is possible regardless of skill level. Therefore, when it is necessary to quickly measure and process a large amount of items, such as automobile parts used in bearings such as bushings, it is convenient because the measurement can be carried out satisfactorily.

Furthermore, in this embodiment, since the second contactor 49 is formed to have a half-moon shape in cross section, the inner surface of the bushing has a key groove R.
Even when a hole such as a sleeve hole Q or a sleeve hole Q is formed, the rollers 40 of the four contactors do not fall into the hole, and the contactor 33 is held between the contacts 32 and 34 in a sandwich shape. Therefore, it is convenient that the roller 39 does not fit into a hole such as a key groove or a cuff hole.

In other words, Fig. 8 shows a state in which four items, the inner and outer diameter dimensions, roundness, and wall thickness dimensions, of a bushing with holes such as keyway 1 and sleeve hole Q formed on the inner surface are measured at the same time, and the effect is as follows. Since the measurement locations are at the same time, the positions of the four items read on the entire 360-degree circumference of the cylinder that is the object to be measured are determined.
It is easier to find the cause of abnormal changes in product dimensional viscosity caused by defects in machines, jigs, cutting tools, etc., and fine adjustment of dimensional accuracy can be made quickly. Furthermore, in order to know the dimensions of item 4 [] later, it is sufficient to automatically record them using a recorder, for example.

In addition, in the above embodiment, four second contacts and four contacts 32 to 34 are used in total, but the number of contacts is not limited to the above. Any configuration is sufficient as long as the contact elements are displaced in directions toward and away from each other.

Further, as the distance from the pivot mechanism 45 to the end of the first arm 16 becomes longer, the magnification increases, and it can be set to a short or long distance depending on the degree of precision of the measurement, such as requiring more precise measurement. .

In addition, various changes may be made in the specific implementation without departing from the gist of the invention.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 1a is a schematic diagram for explaining the action, Figure 2 is a top view, Figure 3 is a side view of the buffer mechanism,
Figure A is a view taken along arrows A-/'M in Figure 2, Figure 1B is a view taken from arrow N in Figure 2, and Figure 1C is a vertical sectional view taken along line M-M- in Figure 1. , FIG. 4 is a side view, FIGS. 4a to 4d are side views of main parts, FIG. 5 is a detailed view of the pivot mechanism, FIG. 6 is a side view, and FIG. 7 is a side view of the pivot mechanism. FIG. 8 is a detailed view of the roller for placing a cylindrical object, as seen from a different side from the one shown in the figure. In the figure 1... Surface plate 16... First arm 54.
... Possible fJJ arm 32 to 34 ... Contact 3
8 to 40...Roller 49...Second contactor
202...Dial gauge (first measuring tool) 253
...Dial gauge (second measuring tool)

Claims (1)

[Claims] A second arm arranged in parallel with the first arm and pivotally supported by a support shaft such that both ends of the arm alternately swing toward and away from the first arm. , contacts provided at the ends of the first arm and the second arm near the spindle so as to face each other, and the first arm and the second arm as a whole. a pivot mechanism that is swingably supported; and a pivot mechanism that is swingably provided at each tip of the first arm and the second arm contactor, and is inserted into a cylindrical object as a measured object during measurement. a roller inscribed on the inner circumferential surface thereof, and a distance displacement between the ends of the first arm and the second arm on the side far from the support shaft, as the object to be measured rotates. A dimension measuring device for a cylindrical object, comprising: a measuring tool; and a second measuring tool that measures the overall swing displacement of the first arm and the second arm on the first arm side.