JPS6032121B2 - Inner diameter measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal flea measuring device that measures the inner diameter of a measured object such as a ring gauge by comparing it with a reference block.

[Prior art]

Conventionally, as a machine for automatically measuring the inner diameter of a ring-shaped object to be measured, there is, for example, a technique disclosed in Hakama Kaisho No. 53-135361.

This technology uses two contacts (measurement end member 1
6, 17) is inserted and opened, and the inner diameter is measured by measuring the distance opened. [Problems] However, with such techniques, errors tend to occur and accurate measurements are difficult to make.

In other words, the order of the inner diameter dimension and the order of the error dimension are very different, so simply adopting precision measuring instruments cannot deal with the order of the inner diameter dimension, while using ordinary measuring instruments cannot cope with the error dimension. there were. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an inner diameter measuring instrument that can accurately measure the inner diameter of an object to be measured.

[Means and actions to solve the problem]

■ The internal measurement device of the present invention moves the object to be measured and a reference block gauge that provides the reference dimensions for measurement in synchronization, and simultaneously uses a pair of contact needles provided in one measurement head. Measure the inner diameter of the object to be measured and the reference block gauge.

At this time, since the dimensions of the reference block gauge are known in advance, if the difference between the two is measured by a precise measuring means, the conventional problems can be solved and accurate measurements can be made. The difference is measured by the angle of inclination of the contact needle. The synchronized movement is performed by attaching the object-to-be-measured teaching stand and the reference block layer stand to a sliding table. (2) In addition to this, the present invention has a configuration for accurate measurement.

First, the table is slid by a rotating body via a crank mechanism. Due to the function of this rotating body, even if the contact needle is fed at a high speed, the speed at which contact is made can be made low. Therefore, contact impact can be reduced and accurate measurements can be made. ■ Next, after contact, the object to be measured platform can be moved in the direction perpendicular to the direction of the tabletop movement, and the maximum value of the inclination angle of the contact needle can be measured, allowing accurate measurement of the inner diameter, that is, the inner diameter. .

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, the overall configuration will be explained with reference to FIGS. 1 to 3.

In these figures, a table 3 is provided on a bed 1 via a bearing 2 so as to be slidable in the left-right direction in FIG. On this table 3, an object to be measured mounting stand 4 and a reference block mounting stand 5 are provided, and these mounting stands 4,
5 are each provided movably relative to the table 3 in a direction perpendicular to the sliding direction of the table 3. A rotating body 6 is rotatably provided in the bed, and this rotating body 6
A slider 8 is provided in a groove 7 passing through the center of the upper surface of the rotating body 6 so as to be movable in the radial direction of the rotating body 6.

The slider 8 is screwed onto a screw shaft 9 rotatably provided on the rotating body 6, and can move within the groove 7 as the screw shaft 9 rotates. The slider 8 and the table 3 are connected via an arm member 10, and the crank movement of the arm member 10 accompanying the rotation of the rotating body 6 causes the table 3 to
In Figure 1, emotions appear in the left and right directions. This arm member 10 is made up of a threaded portion 11 and a nut member 12 screwed onto both ends of this threaded member 11. By adjusting the screwing amount of the nut member 12 into the threaded member 11, the arm member 10 is The length, that is, the distance between the table 3 and the rotating body 6 can be adjusted. At this time, the slider 8 and the nut member 12 and the table 3 and the nut member 12 are connected by an eccentric shaft 13 having a slot groove at the upper end, and by changing the angle of the eccentric shaft 13, the slider 8 and the nut member 12 are connected. The distance between the table 3 and the table 3 can be further finely adjusted. That is, the nut member 1
As shown in FIG. 1, the threaded portion of the screw member 2 is flat, and the distance adjustment by the screwing position with the screw member 11 can only be done at intervals of 180 degrees due to the engagement with the eccentric shaft 13. First, the screw pitch of the screw member 11 can only be adjusted in increments of 1/2. A level adjustment table 14 is provided on the object to be measured table 4 via a rotary position adjustment table 14A, and the level adjustment table 1 can be adjusted by adjusting three vertical screws 15.
4 levels can be adjusted.

A position adjustment table 16 is provided at the center of the level adjustment table 14, and the center position of the position adjustment table 16 can be adjusted by adjusting three horizontal screws 17. Further, the lower small diameter portion of the holding jig 20 that holds the ring gauge 19 as the object to be measured is inserted into the noble hole 18 provided in the center of the position adjustment table 16 and fixed with a set screw 24. It has become. At this time, ring gauge 19
If the size of the holding jig 20 changes, this can be dealt with by replacing the entire holding jig 20. In addition, the holding and feeding tool 20 and the ring gauge 19 refer to the eccentric cam 22 provided with the holding jig 201.
It can be fixed with one touch. Further, a feed screw shaft 23 is provided between the measuring object mounting table 4 and the table 3, and by turning a knob 24 provided on the feed screw contact 23, the table 3 It can be moved up and down in Figure 2. A motor 27 is connected to this feed screw shaft 23 via a clutch 25 and a gear/pulley interlocking mechanism 26.
Automatic feeding is enabled by the motor 27 during operation. A feed screw shaft 28 is also provided between the reference block teaching table 5 and the table 3, and this feed screw shaft 28
By turning a knob 29 provided at , the platform 5 can be moved vertically in FIG. 2 with respect to the table 3.

An intermediate moving table 30 is provided on the reference block stacking table 5 so as to be movable in a direction parallel to the moving direction of the table 3.

A screw shaft 31 is provided between the intermediate moving table 30 and the battle layer table 5, and by turning the knob 32 of the screw lock 31, the position of the intermediate moving table 30, that is, the distance from the object-to-be-measured copying table 4 can be adjusted. can be changed. This intermediate moving table 3
A bell adjustment stand 33 is provided on the top of the holder 0, and the level of the adjustment stand 33 can be adjusted by turning a vertical screw 34. In addition, an intermediate moving table 30 and a bell adjustment table 33 are also provided.
A horizontal screw 35 and a pressing pin 35A are provided between the horizontal screw 35 and the pressing pin 35A, and by turning the horizontal screw 35, the vertical position of the level adjustment table 33 in FIG. 2 can be adjusted. A pair of parallel feed screw shafts 36 are provided on the level adjustment table 33 at a predetermined distance apart, and a pair of parallel guide shafts 37 are provided below the feed screw shafts 36.

A knob 38 is attached to one end of one of these feed screw shafts 36, and the other end of the feed screw shaft 36 to which this knob 38 is attached is connected to the other end of the feed screw shaft 36. The other end is connected to the other end in a one-to-one correspondence by a pair of gears 39, so that they rotate in opposite directions at the same speed. Each pair of these lead screw shafts 3
6 and the guide shaft 37, one support member 40 is attached to each of the feed screw shaft 36 and the guide shaft 37, which are located on the same side. This clamping part village 40 is a plane L
The feed screw shaft 3
9, they move at the same speed and the same distance in opposite directions, that is, in directions toward or away from each other. A sandwich block gauge 41 is abutted on each of the L-shaped protrusions of the support member 40, and a reference block gauge 42 is fixedly fixed between the sandwich block gauges 41.

A column 43 is erected on the back side of the bed, and a spindle 44 is supported on this column 43 so as to be movable up and down.

This spindle 44 is connected to a balancer weight (not shown) via a chain (not shown), and is configured to move smoothly with a small force. Further, by rotating the handle 45, the spindle 44 can be moved up and down via a gear interlocking mechanism and a feed screw mechanism (not shown), and this gear interlocking mechanism is connected to a measuring head drive mechanism via a clutch (not shown). A motor 46 is connected thereto, so that the spindle 44 can be automatically moved up and down by the motor 46 when the clutch is activated. Furthermore, a dial knob 47 is provided on the front surface of the column 43 for setting a switch means (not shown) such as a read switch to a predetermined position for automatically stopping the spindle 44 at a predetermined position. A scale 48 is provided to indicate the position of the switch means operated by the knob 47. A lamp 49 is also provided on the front surface of the column 43 to display the current position of the spindle 44. A measurement head 50 is fixed to the lower end of the spindle 44 . The measuring head 5 has a pair of contact needles 51, and also has an indicator lamp 52 for displaying the position of the contact needles 51 within the object to be measured. When the contact needle 51 makes contact with its right or left side, it requires a contact measurement pressure in each direction, and this measurement pressure is generated by an eccentric cam, a rocking body, a pair of leaf springs, and a pair of leaf springs, which will be described later, by a motor 53. The contact needle 5 is inserted between the springs and transmits the urging force of the leaf spring to the holding member of the contact needle 51.
1. An operation box 54 is attached to the front of the bed, and switches 55 for power, manual/automatic switching, direction switching, height measurement position selection, etc., an indicator lamp 56, a meter 57, etc. are attached to the operation box 54. It is being

Next, the general operation of this embodiment will be explained with reference to FIGS. 1 to 3. The ring gauge 19 as the object to be measured is mounted on the adjustment table 14 of the object to be measured layer 4 of the table 3 via the holding jig 20, and the reference block layer 5
The reference block gauge 42 is inserted between the clamping members 40 provided on the level adjustment table 33 of the
Install.

At this time, the reference block gauge 42 is an elongated rectangular frame in this embodiment, and its longitudinal dimension is approximately equal to the nominal inner diameter dimension of the ring gauge 19, and the center of the ring gauge 19 and the reference block Gauge 42
The distance from the center position of the contact needle 51 of the measuring head 50 is approximately
Reference bar to be equal to the dimension between. Adjust the position of the teaching table 5. The position of the reference block mounting table 5 is adjusted by turning the knob 32 to rotate the screw ratchet 31 and moving the intermediate moving table 30. In addition, the horizontal position adjustment of the battle platform 4 or 5 in the left and right direction in FIG. , by turning the feed screw shaft 24 or the horizontal screw 35. To adjust the stroke of the table 3 in the left-right direction in FIG.
This is done by rotating and changing the .

In addition, the adjustment of the position of the table 3 in the left and right direction in FIG.
By removing the eccentric shaft 13 and moving the nut member 12 of the arm member 10, the half pitch of the thread of the screw member 11 is adjusted, and fine adjustment is performed by rotating the eccentric shaft 13. When the attachment of the ring gauge 19 and the reference block gauge 42, the positional relationship, stroke, etc. settings are completed in this way, the power is turned on and measurement is started. At this time, the measurement start position, that is, the initial position of the contact needle 51 is
The vertical position of the ring gauge 19 is the lowest position when measuring three positions (top, middle, and bottom), and the horizontal position is the ring gauge 19.
This is a position slightly shifted to one side from the center of the measuring head 50, that is, the position marked with the symbol 0 among the display lamps 52 of the measuring head 50 in FIG. 1, and the lamps 52 are lit. When the rotating body 6 is driven in this state and the table 3 is moved to the left in FIG. 1, the contact needle 51 eventually reaches the ring gauge 19
When the table 3 is further moved to the left until it reaches the stroke end, the contact needle 51 is tilted, and the amount of movement due to this tilt is measured by the measuring head 50. be done.

At this time, in order to apply a predetermined measurement pressure to the contact needle 5, a motor 53 provided in the measuring head 50' is automatically driven in accordance with the moving direction of the table 3, and a spring pressure (not shown) is applied. ing. Further, this state is displayed by lighting the lamp at symbol 1 of the display lamp 52. When the table 3 reaches the leftward stroke end, the drive of the rotating body 6 is stopped, while the clutch 25 and the motor 2
7 is automatically driven, the object to be measured stage 4 is moved downward in FIG. 2, and the contact needle 51 is moved along the right inner wall of the ring gauge 19.

Due to this movement, when the contact needle 51 passes the innermost part of the right inner wall of the ring gauge 19, that is, the position indicated by symbol 2 in the indicator lamp 52 in FIG. 1) A change is detected and the peak value is measured and stored. On the other hand, the right pinch block gauge 4
Since the amount of inclination of the contact needle 51 that is in contact with the contact needle 1 is measured, the difference in the amount of mirroring between the two contact needles 51 is detected and recorded. After the peak value was recorded, Senrekidai 4 further recorded a second value.
When the motor 2 moves downward in the figure by a predetermined amount, for example 100 mountains (although it varies depending on the size of the ring gauge 19), the motor 2
7 is automatically stopped, feeding of the platform 4 is stopped, and symbol 3 of the display lamp 52 is lit.

Next, the rotating body 6 is driven again, and the slider 8 and the arm member 10
The table 3 is driven by the crank movement to move the ring gauge 19 in the opposite direction to that described above, that is, to move the ring gauge 19 to the right in FIG. As a result, when the table 3 approaches the right stroke end, the contact needle 51 comes into contact with the left inner wall of the ring gauge 19, and is twisted by a predetermined amount in the opposite direction. At this time, since measurement pressure must be applied to the contact needle 51 in the opposite direction to that described above, the motor 53 is driven again, the biasing direction of the oscillating body is changed by the eccentric cam, and the biasing force is applied by the leaf spring. The direction is reversed.
When table 3 reaches the stroke end, indicator lamp 5
The lamp 4 in 2 is turned on, and the drive of the rotating body 6 is stopped.Then, the motor 27 rotates in the opposite direction to the above-mentioned direction to move the object-to-be-measured counterfeiting stand 4 in the opposite direction to the above-mentioned direction. 2 Move it upward in Figure 2.

As a result of this movement, when the contact position of the contact needle 51 with the inner wall of the ring gauge 19 reaches the peak value corresponding to the symbol 5 position of the indicator lamp 52, the value of the displacement amount of the contact needle 51 in this state and the other contact Needle 51 and left pinch block gauge 4
The difference between the value of displacement due to the bale and the current bale is measured and recorded. After this peak value has passed, the Hagi placing table 4 is moved to the position where the contact needle 51 meets the inner wall of the IJ gauge 19 and is stopped at the position indicated by symbol 6 on the indicator lamp 52, and then the rotating body 6 is driven again. It is brought to the initial measurement position and stopped.
Through the series of operations described above, it is possible to measure the difference between the measured values at the right peak value and the difference between the measured values at the left peak value of the pair of contact needles 51. If you add the dimensions of , the ring gauge is 19.
The inner diameter of the can be measured.

At this time, if the dimensions of the reference block gauge 42 are stored in a measurement value processing device (not shown) in advance, each measurement value is added to these dimensions, the inner diameter of the ring gauge 19 is automatically calculated, and the inner diameter of the ring gauge 19 is automatically calculated and displayed. It can be displayed on the device and printed out on a printer. When the measurement of the lowest position of the ring gauge 19 is completed in this way, the motor 46 provided on the column 43 is driven to place the contact needle 51 at the center position of the ring gauge 19 in the thickness direction (vertical direction). The spindle 44 is raised and stopped so that it can be contacted, and the central lamp among the display lamps 49 of the column 43 is lit accordingly.

In this state, the left and right peak values of the inner wall of the ring gauge 19 are measured in the same manner as described above, and the difference with the measured value on the reference block gauge 41 is recorded. When the measurement at the center position is completed, the spindle 44 is further raised by a predetermined amount. , the measurement of the uppermost position of the ring gauge 19 is carried out in the same manner. These measurements are processed, displayed and printed out in the same manner as described above.

When the measurement of the three vertical positions of the inner diameter at the predetermined position of the ring gauge 19 is completed, the rotary position adjustment table 14A of the object to be measured layer table 4 is automatically rotated by 90 degrees, and the rotation position adjustment table 14A is automatically rotated by 90 degrees in a direction different from the above-mentioned direction by 90 degrees. The inner diameter of the ring gauge 19 is similarly measured at three vertical positions.

In this embodiment, after completing the measurement of three vertical steps of the inner diameter at a predetermined position of the ring gauge 19,
Although the measurement is performed in the same way at three vertical positions after rotating by 0 degrees, it is also possible to measure two directions different by 90 degrees for each stage and repeating this for three stages in the vertical direction.

Next, FIGS. 4 to 7 show the table 3 of the above embodiment.
It is a figure which shows the detail of the part.

Here, the same components as in FIGS. 1 to 3 are indicated by the same reference numerals, and the explanation will be simplified or omitted (the same applies to the following drawings). In these figures, a table 3 is provided with a measuring object calendar table 4 that can be slid freely through a bearing 61, and a bearing 6 is installed in the center of this lectern table 4.
A rotary position adjustment table 14A is provided via 2.

The bell adjustment table 4 is remounted on this adjustment table 14A via a receiving pin 63 having a V-groove on the upper surface and a vertical screw 15 having a ball 64 at the tip, and these adjustment tables 14,
14A are biased toward each other by a tension spring 65. Further, a position adjustment table 16 is mounted on the level adjustment table 14 with a horizontal screw 17 so that the position can be adjusted in the horizontal direction. A large gear 66 is fixed to the lower end of the rotational position adjustment table 14A, and a gear 68 attached to one end of a clutch 67 is meshed with the large gear 66.

Further, a gear 71 fixed to the output shaft of a motor 70 as a rotational drive source is engaged with a gear 69 attached to the end of the clutch 67, so that the rotation of the motor 70 is controlled by the gear 71 when the clutch 67 is operated. , gear 69, clutch 6
7. Rotation position adjustment table 1 via gear 68 and gear 66
6. An indexing plate 72 is fixed to the lowermost end of the rotary position adjustment table 14A, and indexing grooves 73 are formed on the circumferential surface of the indexing plate 72 at 90-degree angles.
There are places set up.

This indexing groove 73 has a hook-shaped portion 75 at one end of the bar 74.
is locked. The lever 74 is formed in the shape of a planar bell crank, and the other end opposite to the hook-shaped portion 45 is rotatably connected to an operating punch 77 of a solenoid 76 . Also,
The central part of the lever 74 is rotatably supported by a pin 78, and the hook-shaped part 7
A tension lug 79 serving as a biasing means for biasing the hook-shaped portion 75 so as to engage with the index groove 72 is provided between the 5th side and the object to be measured table 4 . Note that the reference numeral 80 in FIG. 6 is a limit switch for detecting the position of the lever bar 74, which is turned off when the hook-shaped portion 75 is within the index groove 72. A reference block platform 5 is slidably provided on the table 3 via a bearing 81, and an intermediate moving platform 30 is mounted on the platform 5 via a bearing 82.
is provided so that it can slide in a direction perpendicular to the moving direction of the drum calendar stand 5.

The intermediate moving table 30 and the calendar table 5 are connected by a screw shaft 31 having a knob 32 so that the positions of both the tables 30 and 5 can be adjusted, and a compression spring 83 is installed around the screw shaft 31. Provided between the two stands 30 and 55, the screw shaft 31
backlash can be compensated for. A bell adjustment table 33 is provided on the intermediate moving table 30.

A pin 84, a spherical bearing 85, and a slider 86 provided on the adjustment table 33 at one end between the two tables 30 and 33,
They are connected by a groove 87 provided on the movable base 30 and engaged with the slider 86, and at the other end are connected by a vertical screw 34 provided on the adjustment base 33 and a pedestal 88 provided on the movable base 30'. Furthermore, on both sides of the pond end side, the pedestal 89 provided on the adjustment table 33 and the horizontal screw 35 and pressing pin 35A provided on the movable table 3 are in contact with each other. It is possible to adjust the level of the level adjustment table 33 centered on , and the vertical position in FIG. realizable.

That is, by turning the knob 24 and moving the feed screw shaft 23, the initial position of the object to be measured table 4 in the vertical direction in FIG. 4 is determined, and by driving the motor 27 and moving the feed screw shaft 23, the mounting Automatically feed the layer table 4, by turning the knob 29 to move the feed screw shaft 28 circles, determine the initial position of the reference block calendar table 5 in the vertical direction in FIG. 4, by turning the knob 32 and moving the screw shaft 31. Determine the initial position of the intermediate moving table 30 in the horizontal direction in FIG. 4. Use the horizontal screw 35 to determine the initial position of the level adjustment table 33 in the vertical direction in FIG. By moving the holding member 40, the pinching block 41 and the reference block gauge 42 can be pinched. After measuring the dimension of the ring gauge 19 in one direction, to measure the dimension in a direction 90 degrees different, the lever 74 is actuated against the tension spring 79 by the operation of the solenoid 76, and the key shape is removed from the index groove 73. In this state, the motor 70 is driven to rotate the rotary position adjustment table 14 via the gears 71, 69, the clutch 67, the gear 68, and the large gear 66, and the position adjustment table 14 is displaced by 90 degrees. You can do it by letting them do it. Furthermore, if the contact needle 51 of the measuring head 50 is pressed against the sandwiching block 41 and the reference block holder 5 is moved by turning the knob 29, it is possible to check whether or not the reference block gauge 42 is properly installed. Can be confirmed. That is,
If the contact needle 51 swings in accordance with the feeding of the positioning table 5, it means that the reference block gauge 42 is installed crookedly, so move the horizontal screw 35 to rotate the level adjustment table 33 around the pin 84. It is possible to prevent the contact needle 51 from swinging even when the battle layer base 5 is fed, and to adjust the contact needle 51. Next, ``FIGS. 8 to IO are diagrams showing details of the rotating body 6 of the embodiment shown in FIGS. 1 to 3.

In these figures, a rotating body 6 is rotatably attached to an upper frame 91 that is integrally attached to the bed 1 via a bearing 92.

The upper surface of the rotating body 6 is provided with a diametrical groove 7 as described above, and the slider 8 provided in this groove 7 is movable in the radial direction by a screw shaft 9. Rotating body 6
A large gear 93 is integrally fixed to the lower end of the shaft 93, and an intermediate gear 94 is engaged with the large gear 93. The intermediate gear 94 is rotatably supported by a shaft 95 via a bearing 96.

This shaft 95 is connected to the upper frame 91 at a predetermined distance from the upper frame 91.
a lower frame 97 attached to the bearing 98;
It is rotatably supported via 99. intermediate gear 94
An internal gear 100 is fixed to the internal gear 100, a small gear 101 is fixed to the shaft 95 within the internal gear 100, and both gears 100, 101 are connected between the internal gear 100 and the small gear 101. A slide gear 102 is provided which can be engaged with the shaft 95 and can be moved in the direction of the shaft 95. At this time, the inside of the slide gear 102 is always engaged with the fourth gear 101, and the outside is not always engaged with the internal gear 100, but is engaged when it moves upward. An electromagnetic coil 104 of the clutch 103 is provided opposite the slide gear 102, and this electromagnetic coil 104 is fixed to the upper frame 91 and is connected to the small diameter portion of the small gear 101 where the gears are not cut. A bearing 105 is interposed therein. A gear i06 is attached to the protrusion of the shaft 95 from the upper frame 91.
is fixed, and this gear 106 is engaged with an output gear 109 fixed to an output shaft 108 of a motor with a gear 107 fixed to the upper frame 91. As a result, when the electromagnetic coil 104 of the clutch 103 is energized, the slide gear 102 is pulled up, so that the rotation of the motor 107 is controlled by the output gear 109, the gear 106, the shaft 95, the small gear 101, the slide gear 102, the internal tooth gear 100. , is transmitted to the rotating body 6 via the intermediate gear 94 and the large gear 93. Also, these motors 107,
The clutch 103 and each gear constitute a rotational drive mechanism. An index plate 110 is provided on the lower end surface of the rotating body 6.
is fixed, and three indexing recesses 1 1 1 are provided at 90 degree intervals on the outer peripheral surface of the index plate 110 .
A hook-shaped portion 113 at one end of a lever bar 112 is removably engaged with the indexing recess 111, and the other end of the lever 112 is removably connected to an actuating member 115 of a solenoid 114 serving as a release means. There is. Further, the lever 112 is formed into a dog-shaped plane, and this bent portion is rotatably attached to the pin 116, and between the intermediate portion between this bent portion and the hook-shaped portion 113, and the lower frame 97. A tension spring 117 is provided as a biasing means, and is biased in a direction in which the hook-shaped portion 113 is always engaged with the indexing recess 1111. On the back of the lever 112 is the operating piece 1 of the micro switch 118.
19, and this microswitch 118 controls the energization of the electromagnetic coil 104 of the clutch 103 and the geared motor 07. That is, the solenoid 114 is actuated and the lever 1
When the hook-shaped portion 113 of 12 escapes from the recess 111, the actuating piece 11 of the microswitch 118 is activated by the lever 112.
9 is pressed, motor 107 and clutch 103 are operated to rotate rotating body 6. At this time, when the hooked part 113 escapes from the recessed part 111, the operation of the solenoid 114 is automatically released. Therefore, when the hooked part 113 is engaged in the next recessed part 111, the motor 07 and the clutch 103 are automatically activated by the microswitch 118. It is now stopped automatically. Furthermore, the state in which the hook-shaped portion 113 is engaged with the central recess 113 in FIG. 8 among the three recesses 113 is the state indicated by symbol 0 in the indicator lamp 52 shown in FIG. From this state, the index plate 11 is rotated counterclockwise in FIG. - 3, and states 4 to 6 in the indicator lamp 52 are states in which the hook-shaped portion 113 is in contact with the recess 111 located at the upper side in FIG. One end of a protruding shaft 120 is fixed to the center of the index plate 110, and the other end of the protruding shaft 120 projects outward from the lower frame 97.

The protruding portion of this protruding shaft 120 from the lower frame 97 includes:
Two microswitches 121 are provided at 180 degree positions on a straight line passing through the center of the protruding shaft 120 (the 10th
(see figure), actuating piece 1 of these microswitches 121
22 is adapted to abut against the outer peripheral surface of the protruding shaft 120. The surface of the projecting shaft 120 supported by the actuating piece 122 is provided with a groove 123 at two positions, and the microswitch 121 is turned on and off by moving the tip of the actuating piece 122 into and out of this notch 123. has been done. This microswitch 121 is connected to the motor 5 of the measuring head 50.
The motor 53 is connected to the power supply circuit No. 3 to control the on/off state of the motor 53. With such a configuration, the rotary body 6 can rotate smoothly as described above.

That is, a predetermined switch 55 of the operation box 55 is operated to operate the solenoid 114 to drive the motor 107, and the rotating body 6 is rotated by a predetermined angle according to the indexing operation of the indexing plate 110. This allows Yomo to perform measurements automatically. Note that the reference numeral 124 is a cover that covers the gear 106, the output gear 109, and the like.

Next, FIGS. 11 and 12 are detailed views of the measurement head 50 in the embodiment shown in FIGS. 1 to 3.

In these figures, a measuring head 5 includes a head body 131 shaped like a box, and a fulcrum shaft 132 is provided in the center of the head body 131.
The lower end of the holder 33 is rotatably attached so that the oscillating body 133 can oscillate about the fulcrum koji 132.

This rocking body 133 has an upper member 135 which is bent into an L-shape on the side and has a rectangular notch 134 at the center of the upper part.
, a square block-shaped intermediate member 136 passed through the fulcrum shaft 132, and a flat plate-shaped lower member 137,
A leaf spring 138 as a biasing means is interposed between the upper member 135 and the intermediate member 136 and between the intermediate member 136 and the lower member 137, and these are fixed together by screws 139. has been done. The pair of leaf springs 138 protrude and extend from the side surfaces of the rocking body 133 by a predetermined length. Square cutout 1 of the upper member 135
An output shaft 140 of a motor 53 attached to the back surface of the head body 131 projects from the center of the head body 34 .

An eccentric force member 41 is fixed to this output shaft 140', and the eccentric outer peripheral surface of this individual D cam 141 is connected to the rectangular notch 1.
34, thereby allowing the swinging body 133 to swing around the fulcrum shaft 132 as the eccentric cam 141 rotates. These motors 53,
The oscillating body 1 is
33 tilt drive means are constructed. In addition, actuating pieces 143 of microswitches 142 are provided on the left and right outer surfaces of the upper member 135, respectively, so that the direction of inclination of the rocking body 133 can be detected. The rocking body 13
A pair of contact needle holding members 144 are attached to the head body 131 at positions on both sides a predetermined distance apart from the pivot bearing 14.
5 so as to be swingable. The contact needle 51 is attached to the lower end of this contact needle holding member 144 with a screw 146, and the contact needle 51' is made to be able to sufficiently withstand the measurement pressure applied, and if an excessive force is applied, the contact needle 51' can be screwed down. It is possible to effectively prevent the contact needle 51 from being bent from the stop and being broken. Said contact needle holding part village 1
A core 148 is attached to 44 via an attachment member 147, and this core 148 is inserted into an electromagnetic coil 149. A differential transformer 150 is formed by these cores 148 and electromagnetic coils 149, and this differential transformer 15
0 constitutes a measuring means for measuring the amount of inclination of the contact needle holding member 144. Further, the electromagnetic coil 149 is attached to the measurement head main body 131 via an attachment block 151. One end of an actuating body 152 made of a round bar is attached to each side of the pair of contact needle holding members 144 to which the attachment member 147 is attached.
The other end is located in a gap between a pair of leaf springs 138 attached to the rocking body 133. A spherical supporting body 153 is fixed to the other end of the operating body 152, and this supporting body 153 comes into contact with one of the pair of leaf springs 138 when the rocking body 133 is tilted from the eccentric cam 1411. It is designed to help. In other words, when the rocking body 133 is rotated clockwise in FIG. is assisted by the lower leaf spring 138, whereby both the left and right contact needles 51 are rotated counterclockwise via the actuating body 152 and the contact needle holding member 144, and the lower ends are moved to the right. A predetermined measuring pressure is applied when the contact needle 51 makes contact with the right side surface.Furthermore, even when the oscillator 133 is tilted to the opposite side, a measuring pressure in the opposite direction is similarly applied to the contact needle 51. A balancer 154 is attached to the side of the contact needle holding member 144 opposite to the side on which the attachment member 147 is attached.
7. The weight is balanced with the operating body 152 and the like.

Further, a fine adjustment screw 155 is attached to the balancer 154 to allow fine adjustment of the balance. To perform measurement in such a configuration, the current position of the rotating body 6, that is, the position of the table 3 connected to the rotating body 6 via the arm member 10, is detected by the microswitch 121, and the contact needle 51 is connected to the ring gauge. 19 and the right side wall or the left side wall of the pinch block gauge 41 is sensed, and the motor 53 is thereby driven to cause the eccentric cam 141 to tilt the rocking body 133 in a predetermined direction.

The tilt direction of this oscillator 133 is determined by a micro switch 142.
, and it is possible to know in which direction the rocking body 133 is currently floating. At this time, when the table 3 moves to the left and the contact needle 51 touches the right inner wall of the ring gauge 19, the rocking body 133 is rotated clockwise and the right bale body 153 is moved upwardly. Support body 153 on the left
is brought into contact with the lower leaf spring 138, each contact needle 51 is rotated counterclockwise so that the lower end moves to the right, the table 3 moves to the right, and the contact needle 51 moves to the ring. When touching the left inner wall of the gauge 19, the oscillator 133
is tilted in the opposite direction, and in any case, a predetermined measurement pressure is applied to the contact needle 51. Further, the movement of the contact needle 51 is controlled by the differential transformer 150 via the contact needle holding section 144.
The difference in movement between the left and right contact needles 51 is calculated by a computer (not shown), and the ring gauge 19
The inner diameter of the reference block gauge 42 and the table 3
It is determined as the sum of the difference in movement of the differential transformer 150 during both left and right operations.

As described above, according to this embodiment, the object to be measured layer table 4 and the reference block layer table 4 are provided on the table 3, and the positions of these table plates 4 and 5 can be adjusted with respect to the table 3. Since the ring gauge 19 was installed as an object to be measured,
The positions of the reference block gauge 42 and the reference block gauge 42 can be easily adjusted.

This feeding operation of the table 3 is carried out by the length-adjustable arm member 1.
0, by a crank mechanism composed of a slider 8 and a rotating body 6 whose position is adjustable. In addition, since the rotating body 6 is positioned using the index plate 110, the feeding stroke of the table 3 can be accurately determined, and there is no variation due to inertia that occurs in mechanisms using limit switches, etc., and measurement can be performed easily. I can do it accurately. Also, since it is a crank mechanism, the ring gauge 19 is not related to measurement.
The feed speed of table 3 at the center position becomes faster,
The speed near the inner wall of the ring gauge 19 is low, so that the impact on the contact needle 51 can be reduced. Furthermore, since the rotating body 6 and the measuring object table 5 can be automatically fed by the motors 107 and 27, the ring gauge 19
Since the inner diameter of the contact needle 51 can be automatically measured and the maximum value of the displacement of the contact needle 51 is measured, the diameter can be accurately measured. Furthermore, according to this embodiment, the inner diameter of the ring gauge 19 is measured by moving the measuring head 50 up and down in three steps by the motor 46, so that the straightness of the inner diameter of the ring gauge 19 can be measured. and the motor 70,
Since the ring gauge 19 is rotated 90 degrees by the action of the indexing plate 72 and the like, roundness can also be measured automatically.

Further, according to this embodiment, a swinging body 133 is provided in the measurement head 50, and a pair of leaf springs 138 attached to the swinging body 133 are configured to always apply a biasing force in the contact direction to each contact needle 51. Therefore, valid measurements can always be made.

Furthermore, since the movement of the rocking body 133 is automatically performed by moving the motor 53 in conjunction with the movement of the rotary body 6, that is, the movement of the table 3, there is no need to worry about manual operation.
Not only does this eliminate the need to search, but it also eliminates the need to forget to switch the direction of measurement pressure, which prevents measurement errors. Furthermore, the mechanism for switching this measurement pressure is simple and can be provided at low cost. In the above embodiment, a ring gauge was used as the object to be measured, but the same method can be applied to an object having a general cylindrical inner diameter.

Further, the structure of each part is not limited to the structure of the above-mentioned embodiment, but includes modifications within a range that can achieve the object of the present invention.
[Effects of the Invention] As described above, according to the present invention, ■ Since the measurement is performed by comparing the object to be measured and the reference block gauge that provides the reference dimensions for the measurement, a precise measurement means can be used and accuracy can be achieved. measurements can be made.

■ In addition, since the table slides during measurement is performed by a rotating body via a crank mechanism, the speed at which the contact needle makes contact can be reduced, reducing the contact impact and allowing for accurate measurements ■ The trouble of the contact needle It is possible to measure the maximum oblique angle and the straight inner diameter.

Therefore, it is possible to provide an internal flea measuring device that can accurately measure the internal diameter.

[Brief explanation of the drawing]

The figure shows an embodiment of the inner diameter measuring device according to the present invention.
Fig. 1 is an overall front view, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is a partially cutaway plan view of the table, and Fig. 5 is V-V of Fig. 4. 6 is a sectional view taken along the line W- in FIG. 5, FIG. 7 is a sectional view taken along the line W- in FIG. 5,
Fig. 8 is a plan view of a part of the rotor section cut out approximately along the wind surface of Fig. 9, Fig. 9 is a sectional view taken along the line K-K in Fig. 8,
Figure 10 is a bottom view of the X-X line in Figure 9, Figure 11 is a front view with the main parts of the measuring head cut away, and Figure 12 is the
FIG. 1...Bed, 3...Tefle, 6...Rotating body,
8... Slider, 10... Arm member, 19... Ring gauge as a measured object, 42... Reference block. book gauge, 43...column, 44...spindle, 46...
Motor as a measuring head drive mechanism, 50... Measuring head, 51... Contact needle, 107... Geared motor as a rotating body drive mechanism, 110... Index plate, 111
... indexing recess, 112... lever, 114...
- Solenoid as release means, 117... tension spring as biasing means. Figure 1 Figure 5 Figure 2 Figure 6 Figure 7 Figure 3 Figure 8 Figure 4 Figure 9 Figure 10 Figure 11 Figure 12

Claims (1)

[Claims] 1 A bed, a table provided on the bed so as to be slidable in a certain direction, and a ring-shaped object to be measured horizontally supported and attached to the table so as to be movable in a direction perpendicular to the table sliding direction. a reference block mounting table that supports a reference block gauge and is attached to the table; a rotating body that reciprocates the table in the sliding direction via a crank mechanism; a measuring head movably mounted; a pair of contact needles provided on the measuring head and inclined in contact with inner walls of each of the ring-shaped object to be measured and the reference block gauge; and measuring means for measuring the difference in the maximum value of the inclination angle of the contact needle of the object to be measured, the measuring means for measuring the difference in the maximum value of the inclination angle of the contact needle of the object to be measured. The maximum value of the inclination angle of the contact needle in contact with the object to be measured is determined, and the difference between the inclination angles of both contact needles is measured at this maximum value.By adding this difference to the dimension value of the inner diameter of the reference block gauge, the measurement object can be determined. An inner diameter measuring device characterized by measuring the inner diameter.