JPS634641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inner diameter measuring machine that measures the diameter of a hole in a workpiece using a probe that moves back and forth in the radial direction of a spindle following the movement of a spindle.

As a conventional inner diameter measuring machine, a dial gauge is attached to one end of the cylindrical body, and a
There is a structure in which a spindle for pushing the measuring axis of the dial gauge is slidably installed inside the main body, and a gauge head is provided at the other end of the main body to follow the movement of the spindle and move back and forth in a direction perpendicular to the spindle. Are known.

In such conventional internal diameter measuring machines, a spring that always biases the probe in the projecting direction is interposed between the main body and the spindle, but in the conventional structure, the biasing force of this spring cannot be applied from the outside. It was impossible to adjust. Therefore, if you want to change the measuring pressure due to the material of the object to be measured, etc., you have to disassemble the measuring device and replace the spring, which is very troublesome. There was a desire for an internal diameter measuring machine that could be changed to

The object of the present invention is to provide an inner diameter measurement system that allows measurement pressure to be set easily and accurately from the outside, eliminates the need for correction operations such as zero point alignment when changing measurement pressure, and that allows measurement pressure to be changed during measurement work. The aim is to provide the opportunity.

Therefore, in the present invention, a pair of levers are rotatably provided in a cylindrical main body, and a spindle that moves forward and backward by the rotational operation of the pair of levers is installed inside the main body so as to be movable in its axial direction. and an inner diameter measurement device in which the main body is provided with a plurality of probes that follow the movement of the spindle and advance and retreat in a direction perpendicular to the axial direction of the spindle, and a detector that detects displacement of the spindle in the axial direction. In the machine, a movable member is provided in the main body so as to be movable in the axial direction of the spindle, and between the movable member and the spindle, the measuring element projects in a direction perpendicular to the axial direction of the spindle. A spring is provided to bias the spindle, and an operating member is provided on the outer periphery of the main body so as to be rotatable about the axis of the spindle but not movable in the axial direction, and the movable member is not rotated based on the rotation of the operating member. The spindle is configured to include an interlocking mechanism that moves the spindle in the axial direction.

Therefore, when the operating member is rotated, the moving member moves in the axial direction of the spindle via the interlocking mechanism.
Since the urging force of the spring changes, the measurement pressure can be easily changed from the outside. Moreover, since the moving member does not rotate but only moves in the axial direction of the spindle, no torsional force is generated on the spring, and the measurement pressure can be set accurately. In addition, even if the biasing force of the spring changes as the movable member moves, the relative positional relationship between the spindle and the detector does not change, so even if the measurement pressure changes, the work of zeroing the spindle and the detector, etc. In addition, since the orientation of the detector is always kept constant, there is no need for correction work when changing the measured pressure. Moreover, since you can hold the pair of levers with one hand and rotate the operating member with the other hand, you can change the measuring pressure while measuring the inner diameter, for example, measuring the same point while changing the measuring pressure. There are advantages that can be achieved.

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

In FIG. 1 showing the overall configuration, a cylindrical main body 1 is composed of a first cylindrical body 2 and a second cylindrical body 3 screwed and fixed to one end of the first cylindrical body 2, A spindle 4 is housed within the main body 1 so as to be movable in the axial direction. This spindle 4
is constructed by integrally forming a large diameter part 4A and a small diameter part 4B, and this small diameter part 4B is slidably inserted into a small inner diameter part 2A provided on one end side of the first cylindrical body 2. There is.

A truncated conical contact member 5 having a circular hole in the center is fixed to the step between the large diameter portion 4A and the small diameter portion 4B of the spindle 4 by appropriate means such as press-fitting or adhesion into the small diameter portion 4B. There is. This contact member 5
One end of a compression coil spring 6 is brought into contact with the upper surface, and the other end of this spring 6 is brought into contact with the lower surface of a moving member 7, and this moving member 7 is attached to the large diameter portion 4A of the spindle 4 in the axial direction of the spindle 4. It is attached so that it can be moved freely. Further, the tapered surface formed on the outer shape of the contact member 5 is locked by the biasing force of the spring 6 to the stepped portion 2B formed on the inner diameter of the first cylindrical body 2.

The outer periphery of the moving member 7 is in sliding contact with the inner diameter of the first cylindrical body 2, and an engaging member 8 formed in the shape of a machine screw is implanted on the circumferential surface of the moving member 7. The outer end of the engaging member 8 projects through an elongated guide groove 2C formed through the first cylindrical body 2, and this protrusion is rotatable around the outer periphery of the first cylindrical body 2. It is engaged with a spiral groove 9A on the inner surface of the operating member 9, which is provided so as to be immovable in the axial direction. At this time, the guide groove 2C is provided along the axial direction of the spindle 4 with a width slightly wider than the outer diameter of the engaging member 8, and guides the engaging member 8 so that it can move only in the axial direction of the spindle 4. The spiral groove 9A is provided with a relatively large pitch and a width slightly wider than the outer diameter of the engaging member 8, so that the engaging member 8 can move along the spiral groove 9A as the operating member 9 rotates. It's like that. Here, these spiral grooves 9A, the engaging member 8 and the first cylinder 2
The guide groove 2C constitutes an interlocking mechanism 10, and the interlocking mechanism 10 transmits the rotational movement of the operating member 9 to the moving member 7 as an axial movement of the spindle 4. At this time, knurling such as a line or a cross is appropriately formed on the outer periphery of the operating member 9 in order to facilitate rotational operation.

A nut 11 with a flange having threads formed on the inner and outer peripheries is screwed into the upper end of the first cylindrical body 2 in the figure, and the flange portion 11A of this nut 11 protrudes from the outer periphery of the first cylindrical body 2. , this collar portion 11A and the first
A C-ring 12 is fixed in the middle of the outer circumference of the cylindrical body 2.
Both ends of the operating member 9 are sandwiched between the two ends of the operating member 9, so that the operating member 9 is supported on the outer periphery of the first cylindrical body 2 so as to be rotatable and immovable in the axial direction, as described above.

A threaded portion of a dial gauge holder 13 is screwed into the inner diameter thread of the nut 11, and this holder 13 is held in place by a so-called double nut action between the locking nut 14, which is also screwed into the threaded portion of the holder 13, and the nut 11. Fixed. A stem 15A of a dial gauge 15 as a detector is inserted into the inner diameter of this holder 13, and this stem 15A is connected to a plurality of slot grooves 13A formed on the upper end side of the holder 13 in the figure. At the outer periphery of the forming part of the groove 13A, the holder 13
The ring 16 is fitted onto the holder 13, and the fixing screw 17 is screwed into the ring 16 and presses the holder 13.

Further, the screwing position of the holder 13 into the nut 11 and the locking position of the lock nut 14 can be adjusted as appropriate, and this adjustment is made in accordance with the shape of the dial gauge 15, especially the length of its measuring shaft (spindle) 15B. As a result, the measurement axis 15B
The tip 15C fixed to the tip is brought into contact with the end surface of the large diameter portion 4A of the spindle 4 with a predetermined measuring pressure.

The base ends of a pair of levers 18 are rotatably attached to the lower outer periphery of the first cylindrical body 2 in the figure via a shaft 19. As shown in FIG. A side plate 18B can be inserted on the outside. Furthermore, the way in which the proximal ends of both levers 18 are overlapped is the second one.
As shown in the figure, the side plates 18B on both sides are stacked alternately, and the side plates 18B located on the outside of each lever 18 in the overlapped portion
are integrally formed with locking sides 18C bent inward, and these locking sides 18C are brought into contact with the outside of the lever 18 on the other side, thereby moving both levers 18 along the solid line in Figure 1. It is locked so that it cannot rotate in the opening direction from the illustrated state.

On the free end side of the portion of the lever 18 supported by the shaft 19, elongated holes 18D are formed in the side plates 18B on both sides, and these elongated holes 18D
A pin 20 is strung between them. This pin 2
The pin 20 is movable along the elongated hole 18D, and the pin 20 is inserted into one end of a pressing member 21 in the shape of a short round bar. This pressing member 21
The other end is inserted into a hollow guide 22 screwed into the first cylinder 2 at the stepped portion 2B of the first cylinder 2, and penetrates through the first cylinder 2 via this hollow guide 22. It is made to be able to protrude into the first cylindrical body 2 and come into contact with the tapered surface of the abutment member 5 that is locked to the stepped portion 2B of the first cylindrical body 2. As a result, when the pressing member 21 is pushed into the first cylindrical body 2, comes into contact with the abutting member 5, and is further pushed in, the abutting member 5 can be pushed up against the spring 6. has been done.

Inside the inner diameter of the second cylindrical body 3 screwed and fixed to the lower end of the first cylindrical body 2, there is a tapered surface 23 at the lower end.
An actuating body 23 having a diameter A is slidably inserted in the axial direction of the spindle 4, and a small diameter ball 24 is interposed between the upper end surface of the actuating body 23 and the lower end surface of the small diameter portion 4B of the spindle 4. The spindle 4 and the actuating body 23 are interlocked by point contact.

A guide cylinder 3A is provided at the lower end of the second cylinder 3 in a 120-degree equidistant direction (see FIG. 3), and a substantially mushroom-shaped probe 25 is provided inside the guide cylinder 3A. It is inserted into the spindle 4 so that it can move forward and backward in a direction perpendicular to the spindle 4, that is, in a radial direction of the spindle 4. The inner end side of this probe 25 is formed into a large diameter portion 25A,
The inner end surface of this large diameter portion 25A is a tapered surface 25B that comes in close contact with the tapered surface 23A of the actuating body 23. Moreover, this large diameter portion 25A and the guide cylinder 3
A compression coil spring 27 is interposed between the cap nut 26 screwed into the end of A, and the action of this spring 27 causes the tapered surface 25B of the probe 25 to always
It is urged to come into contact with the tapered surface 23A of the actuating body 23.

A key groove 25C is provided on the outer circumferential surface of the large diameter portion 25A of the measuring head 25, and the tip of a key 28 inserted from the bottom surface of the second cylindrical body 3 is engaged in this key groove 25C. Due to the action of the key 28 and the keyway 25C, the probe 25 slides without rotating. Further, an anvil 29 is provided protruding from the outer end of the measuring head 25.
9 so as to accurately abut against the wall surface of the hole 30A for measurement of the object 30 to be measured.

Next, how to use this embodiment will be explained.

Grip the two levers 18 together with the first cylindrical body 2 of the main body 1, and move the levers 18 to the first position about the shaft 19.
1 to the cylindrical body 2 side and place it in the position shown by the chain line in FIG. As a result, the pressing member 21 attached to the lever 18 via the pin 20 projects into the first cylindrical body 2 and comes into contact with the abutting member 5, causing the abutting member 5 to resist the spring 6. and push upward. At this time, since the pin 20 is movable along the elongated hole 18D, the lever 18 can be rotated smoothly. As the abutment member 5 rises, the spindle 4 also rises, and therefore the force pushing down the actuating body 23 is removed. Therefore, each side stator 25 pushes up the actuating body 23 via the tapered surfaces 25B and 23A and retracts it into the second cylindrical body 3 due to the action of the compression coil spring 27.

In this state, insert the probe 25 into the hole 3 of the object to be measured 30.
0A, and then gradually release the force holding the lever 18, the pressing member 21 will be gradually retracted from the cylindrical body 1, and the spindle 4 will release the spring 6.
is displaced downward by the spring force, and presses the probe 25 in the projecting direction via the operating body 23. At this time, since the spring force of the spring 27 that urges the probe 25 inward is set to be relatively weak, it cannot resist the spring force of the spring 6, and each probe 25 is pushed out against the spring 27. Finally, the outer end of each probe 25 comes into contact with the inner wall of the hole 30A of the object to be measured 30 and stops.

On the other hand, since the measuring shaft 15B of the dial gauge 15 moves up and down following the up and down movement of the spindle 4,
If the value shown on the dial gauge 15 is read while the probe 25 is stopped, this can be measured as the inner diameter of the hole 30A.

By the way, when the material of the object to be measured 30 is different, it is necessary to change the measurement pressure by the spring 6, but in this case, the adjustment can be made by operating the operating member 9. That is, if the operating member 9 is rotated clockwise when viewed from above in FIG.
Spiral groove 9 formed in a left-handed thread (reverse thread) shape
A and the guide groove 2C cause the engaging member 8 to move to the first position.
The moving member 7 is moved downward in the figure, and along with this, the moving member 7
Since the spring 6 is also moved downward, the spring force of the spring 6 is strengthened.

On the other hand, in order to weaken the spring force of the spring 6 from the state in which it is strengthened in this way, the operating member 9 may be rotated in the opposite direction.

According to this embodiment as described above, there are the following effects.

The spring pressure of the spring 6, that is, the measurement pressure of the probe 25, can be easily adjusted by simply rotating the operating member 9 via the interlocking mechanism 10 and the moving member 7. This spring pressure adjustment mechanism has a simple structure and is therefore inexpensive. can be provided to

Furthermore, since the moving member 7 does not rotate but only moves in the axial direction of the spindle 4, no torsional force is generated on the spring 6, and the measurement pressure can be set accurately. Further, even if the biasing force of the spring 6 changes as the moving member 7 moves, the relative positional relationship between the spindle 4 and the dial gauge 15 does not change, so even if the measurement pressure changes, the spindle 4 and the dial gauge 15 do not change. There is no need to perform zero point alignment work with the dial gauge 15, and since the orientation of the dial face of the dial gauge 15 is always kept constant, there is no need for correction work when changing the measurement pressure.

Further, two levers 18 are provided, and the levers 18 are inserted into the hole 30A of the object to be measured 30 while being grasped together with the main body 1.
The inserted state does not collapse, stable measurements can be made, and one-handed operation is possible. Therefore, since the operating member 9 can be rotated while measuring the hole diameter with one hand, the same tube location can be measured while changing the measurement pressure.

Furthermore, by operating the lever 18, the spindle 4
The mechanism for raising the lever 18 against the spring 6 does not require any assembly operation inside the first cylindrical body 2, and the pressing member 21 of the lever 18, which is assembled separately, is moved inside the hollow guide 22. Since it only needs to be inserted into the holder, the number of assembly steps can be significantly reduced compared to conventional structures using links, etc., and almost no adjustment is required. Furthermore, since the structure is simple, the number of processing steps can be reduced, and the overall shape can be made smaller. Furthermore, like the conventional structure using links, a long hole for the link to move is provided in the cylinder 2.
Since there is no need to provide an airtight structure and the structure can be almost sealed, the dustproof effect can be improved. Further, since the fixing position of the dial gauge holder 13 can be easily adjusted by the action of the nut 11 and the lock nut 14, attachment of dial gauges 15 of different types (sizes) can be easily accommodated.

In the above embodiment, the interlocking mechanism 10 that moves the moving member 7 is provided with one engaging member 8 and one spiral groove 9A each (one thread); It may be made to engage with the spiral groove 9A. Further, the shape of the abutting member 5 is not limited to a truncated cone shape, but may be any shape such as a rectangular shape in which the surface that abuts the pressing member 21 is beveled. It is sufficient that a tapered surface is formed. Further, the abutment member 5 may be locked to the spindle 4 by other methods such as screwing, or may be formed by cutting integrally with the spindle 4. In addition, this contact member 5 has a stepped portion 2B.
The structure is not limited to locking at the tip of the pressing member 21, but the pressing member 21 may be extended and locking at the tip of the pressing member 21. However, in this case, the opening stopper of both levers 18 needs to have a stronger structure than the locking side 18C of the above embodiment. In addition, the escape structure of the fulcrum part of the pressing member 21 as the lever 18 rotates is such that the elongated hole 1
This is not limited to 8D, but can also be achieved by providing a swingable hollow guide.

According to the present invention as described above, it is possible to easily and accurately set the measurement pressure from the outside, and there is no need for correction operations associated with changing the measurement pressure, and furthermore, the measurement pressure can be changed during measurement work. This has the effect of providing a machine.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the inner diameter measuring machine according to the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a bottom view of FIG. 1. DESCRIPTION OF SYMBOLS 1... Main body, 2... First cylindrical body, 2C... Guide groove, 3... Second cylindrical body, 4... Spindle, 6...
... Spring, 7... Moving member, 8... Engaging member, 9... Operating member, 9A... Spiral groove, 1
0...Interlocking mechanism, 15...Dial gauge, 25
...Measuring point, 30...Object to be measured, 30A...hole.

Claims (1)

[Scope of Claims] 1. A pair of levers are rotatably provided in a cylindrical body, and a spindle is provided inside the body so as to be movable in the axial direction of the spindle, which is moved forward and backward by the rotational operation of the pair of levers. , and the main body is provided with a plurality of probes that move forward and backward in a direction perpendicular to the axial direction of the spindle in accordance with the movement of the spindle, and
In the inner diameter measuring machine provided with a detector for detecting displacement of the spindle in the axial direction, a movable member is provided in the main body so as to be movable in the axial direction of the spindle, and a movable member is provided between the movable member and the spindle. A spring is provided for biasing the spindle in a direction in which the probe protrudes perpendicularly to the axial direction of the spindle, and an operating member is provided on the outer periphery of the main body so as to be freely rotatable about the axis of the spindle but cannot be moved in the axial direction. An internal diameter measuring machine, further comprising an interlocking mechanism that moves the movable member in the axial direction of the spindle without rotating the movable member based on the rotation of the operating member. 2. In claim 1, the interlocking mechanism includes a spiral groove provided in the operating member, and an engaging member having one end engaged with the spiral groove and the other end fixed to the moving member. and,
An inner diameter measuring machine characterized by comprising a guide groove in which the engaging member is fitted and which moves the engaging member in the axial direction of the spindle and is provided in the main body.