JPS63289408A - Inner diameter measuring instrument - Google Patents

Abstract

PURPOSE:To enable operability to be improved and accurate measurement to be conducted even for an electronic display type by operating switch groups provided on displacement measuring and displaying means or a grip portion before and in the measurement. CONSTITUTION:A measuring instrument body 70 is provided with a probe support 21 and a grip portion 1A on both ends. The support 21 supports a probe 22 capable of abutting against the inner surface of the hole of an object to be measured so as to be movable in a direction perpendicular to that of the axis of the body 70. The grip portion 1A is provided with an operating lever 35 as measuring instrument operating means for moving the probe 22. The intermediate portion of the body 70 is provided with an encoder 12 that measures the displacement quantity of the probe 22. Measured contents are displayed by displacement measuring and displaying means 2. A measuring condition is set by operating a switch group provided on the means 2 before the initiation of a measurement. The same mechanism is operated by a plurality of switch groups 19 provided in a plurality of the positions of the grip portion 1A in the measurement.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a measuring device that moves a measuring device supported by a measuring device supporting portion of a measuring device main body perpendicularly to the axial direction of the measuring device main body using a measuring device operating means such as a lever. The present invention relates to an inner diameter measuring device that moves forward and backward in the direction of the object to be measured and brings it into contact with the inner surface of a hole in the object to be measured, and measures the amount of movement of the measuring point with an encoder and displays it on a display.

[Conventional technology]

Internal diameter measuring machines have traditionally been known to measure the internal diameter of a hole in a workpiece by detecting the positional change of a spindle using a dial gauge, but in recent years, high precision measurement, prevention of reading errors, and various There is a background that electronic display type is desired due to the realization of high value-added measurement by adding functions.

Therefore, it is conceivable to adopt an electronic display type for the inner diameter measuring machine as well as other measuring machines.

[Problem that the invention seeks to solve]

By the way, since the displacement measurement display means of the conventional inner diameter measuring machine is formed from a dial gauge, it is necessary to have a structure in which the dial gauge is provided at the upper end of the spindle, and the gauge head operation means is arranged in the middle part. Become. Therefore, even if the operating means is formed from a pair of symmetrically arranged levers, it is difficult to maintain a proper posture, and the mechanism becomes large and complicated. Further, since the upper end side is heavy, it is inconvenient to handle and can only be operated with the spindle in a vertical position. Furthermore, since the measurement value must be visually read while the probe is in contact with the inner surface of the measurement, the objects to be measured are significantly limited and the applicability is narrow.

On the other hand, in this configuration, even if electronic displacement detection means were adopted in place of the dial gauge, it would be difficult to achieve the original measurement accuracy due to thermal expansion and deformation of the long spindle, and It has no meaning. In addition, the inconvenience of handling and restrictions on measurement posture still cannot be improved.

As described above, with the inner diameter measuring machine, it has been difficult to achieve both the original measurement accuracy and the expansion of the applicable range of objects to be measured.

It is therefore an object of the present invention to provide an inner diameter measuring machine that can improve operability and perform accurate measurements even if it is an electronic display type.

[Means for solving problems]

In the present invention, a measuring stylus support part is formed at one end of a measuring machine main body, and a handle part is formed at the other end, and the measuring stylus supporting part of the measuring machine main body is movable in a direction perpendicular to the axial direction of the measuring machine main body. A measuring device is provided with a measuring device operating means for moving the measuring device in the above-mentioned direction in the handle portion of the measuring device, and a measuring device that supports a measuring device that can be brought into contact with the inner surface of the hole of the object to be measured; Displacement measurement display means is provided in the middle part, and includes an encoder capable of measuring the amount of displacement of the measuring stylus, and a display device that displays the content of measurement by this encoder, and measurement condition settings that are operated before starting measurement are provided on this displacement measurement display means. 1st for
A group of switches for operating the same mechanism during measurement are provided at multiple positions on the handle of the main body of the measuring instrument.
A plurality of switch groups are provided.

[Effect]

As a result, the present invention operates the first switch group provided on the displacement measurement display means before starting measurement, and operates the second switch group provided on the handle during measurement, and operates the plurality of second switch groups. The purpose is to achieve the above object by making it possible to operate the switches even when the gripping posture is changed using a group of switches.

[Embodiment] Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 5.

In FIGS. 1 and 2, which show the overall structure, a measuring device main body 70 is composed of a substantially flat cylindrical casing 1 and a head main body 21 as a measuring element support part. A displacement measurement display means 2 is provided in the section. The casing 1 is formed with a handle portion IA, and an L-shaped bent portion is formed at one end on the right side in FIG.

The displacement measurement and display means 2 includes a display main body 3 having a cylindrical shape with a bottom, and a spindle 5 is disposed on the display main body 3 so as to be movable along the axial direction of the casing 1. Movement of the spindle 5 at the other end is regulated by a stopper 32 provided at one end on the right in FIG. Rotation in the circumferential direction is restricted by grooves (not shown).

A main scale 7 is attached to the main body 3 on the spindle 5 via a scale attachment member 6, and an index scale 8 is attached to the main body 3 via a scale attachment member 9 and a spacer 10, facing the main scale 7. A substrate 116, which is fixed at 3, is attached. Here, the main scale 7 and the index scale 8 constitute a capacitive encoder 12 that measures the amount of displacement of the spindle 5. This encoder 12 is electrically connected to an electrical component 13 attached to the board 11. At this time, the electrical components 13 include a connector, a counter, a waveform shaping circuit, a controller, and the like.

A bottomed cylindrical frame 16 is rotatably attached to the display main body 3, and a stopper 17 attached to the main body 3 restricts rotation of the frame 16 to less than one rotation, that is, less than 360 degrees. has been done. Furthermore, a display 15 for digitally displaying the amount of spindle displacement and a substrate 34 are provided at the bottom of the frame 16, and this substrate 34 and the substrate 1 of the main body 3 are provided.
A flat cable 14 that electrically connects the display device 15 and the electrical component 13 is provided between the display device 1 and the display device 1 .

The flat cable 14 is a band-shaped body in which a plurality of wires are arranged in parallel to each other, and has a constant curvature, and has an arc shape of 270±45 degrees in a free state (see FIG. 4).

Here, as shown in FIG. 3, the frame 16 and the main body 3 are attached to the substrate 11.34 with the flat cable 14 partially inverted. are the guide surfaces 11A and 34 facing each other.
A is arranged so that it is parallel. Further, the outer circumferential surface of the flat cable 14 is located on a virtual circular locus centered on the rotation axis of the frame 16, and
It is guided in contact with ring-shaped end surfaces (not shown) formed at 1A and 34A. That is, the flat cable 14 has sufficient elastic force to be guided in contact with these ring-shaped end surfaces.
For example, it is not made of cloth, but rather has a flexible structure that has more elasticity than ordinary paper.

On the surface of the frame 16, as shown in FIG.
0FF switch 18A5 inch/mm changeover switch 18
B. First switch group 1 for setting measurement conditions consisting of preset switch 18C and zero set switch 18D
8 is placed.

Further, in the vicinity of the display main body 3 of the handle part IA and one end of the casing, that is, the right end in FIG. Two sets of second switch groups 19 are arranged, and the positions of these switches 19A and 19B are point symmetrical with respect to the handle IA. The switch groups 18 and 19 are connected to the electrical equipment 13, and the measured values are displayed on the display 15 by operating these switch groups 1B and 19.

At the tip of the head body 21, there is a measuring element 22 that can move forward and backward in a direction perpendicular to the spindle movement direction, that is, in a radial direction.
A plurality of are provided at predetermined angular intervals. Each of these probes 22 has a pin-shaped contact 23 at its tip that can come into contact with the inner surface of the hole of the object to be measured, and has a tapered surface 22A formed on the display main body 3 side of the proximal end. This tapered surface 22
A cone 24 as a displacement converting means having a conical portion 24A facing A is provided so as to be reciprocally movable within the head body 21 with its axis aligned with the spindle axis.

The cone 24 is brought into contact with one end of the spindle 5 via a ball 25, and in the abutting state converts the axial movement of the spindle 5 into a radial displacement of the measuring tip 22, whereby the measuring tip The movement displacement amount of 22 is the spindle 5
It is designed to be measured by the encoder 12 via the encoder 12.

Between the measuring head 22 and the head main body 21, there is a 10th rod which always biases the measuring head 22 toward the cone 24 side and also biases the spindle 5 through the cone 24 in the opposite direction to the measuring head side.
A leaf spring 26 is interposed as a biasing means. Here, the measuring head 20 is composed of the head main body 21, the measuring element 22), the contact element 23, the cone 24, and the leaf spring 26.

On the opposite side of the measuring device main body 70 from the measuring head 20, a cylindrical body 27 is provided inside the handle IA with its axis parallel to the casing axis. This cylinder 27
A bushing 28 is screwed onto the side opposite to the display main body 3, and a plunger 29 is provided within the cylinder 27 with its axis aligned with the spindle axis. One end of the plunger 29 passes through the bush 28 and is movable back and forth in the spindle axial direction, and movement of the one end is restricted by a stepped portion 29A formed in the middle. On the other hand, this plunger 29
On the other end side, that is, on the spindle 5 side, a partition member 30 is slidably provided on the inner wall of the cylinder, and further, the other end can come into contact with the spherical end of the spindle 5. A compression coil spring 31 as a second urging means is interposed between the partition member 30 and the bushing 28, and this coil spring 31 has a stronger urging force than the leaf spring 26 and also It is always biased in the direction of contacting the spindle 5.

A cylinder chamber 38 is formed surrounded by the cylinder body 27, the display main body 3, and the partition member 30, and this cylinder chamber 3B
surrounds the contact portion between the spindle 5 and the plunger 29 in an airtight state, and its volume changes as the plunger 29 and the like move back and forth. The cylinder body 27
A through hole 39 is formed in the vicinity of the display body 3, and this through hole 39 is formed in a size large enough to restrict the sudden movement of the plunger 29, and also allows the inside and outside of the cylinder chamber 38 to be opened. It seems to be communicating. Here, the cylinder chamber 38 and the through hole 39 constitute an air damper mechanism 40.

At the rising part of the bent end of the casing 1,
A bell crank-shaped operating lever 3 as a probe operating means
5 is rotatably attached via a support shaft 36. This operation lever 35 has one long side that is connected to the casing 1.
While it is exposed to the outside as a grip portion 35B, the other short end thereof is engaged with one end side of the plunger 29 within the casing 1. As shown in FIG. 5, the engagement portion between the operating lever 35 and the plunger 29 includes a ring 42 as an engagement piece attached to one end of the plunger 29 with a screw 41, and a plunger attached to the ring 42. The plunger 29 can be contacted from the side, and is attached to the arcuate contact portion 35A formed at the forked tip of the lever 35 and the inner surface between the forked tips of the operating lever 35 to allow movement of the plunger 29 in the axial direction. It also includes a pair of pins 43 each having a spherical top to prevent the plunger 29 from disengaging from the operating lever 35. Also,
A torsion coil spring 37 is interposed between the lever 35 and the casing 1 to keep the lever 35 in constant contact with the ring 42 and prevent the lever 35 from wobbling.

Next, the operation of this embodiment will be explained.

First, the first switch group 18, such as the ON10FF switch 18A and the 2-inch/millimeter changeover switch 18B, is used to operate the switches necessary to set the measurement conditions. Thereafter, grip the handle IA and the operating lever 35 with the fingers a facing toward one end of the casing I, for example toward the display body 3. As a result, the plunger 29 is moved in a direction away from the spindle 5 via the contact portion 35A and the ring 42 against the coil spring 31. Then, the force that urges the spindle 5 and the cone 24 to the left disappears, so the probe 22 is retracted into the head body 21 by the leaf spring 26, and the spindle 5 is thereby influenced by the plunger 29 via the cone 24. It is moved in the same direction as the plunger 29 without moving. In this case, because the spring force of the leaf spring 26 is weak and because the through hole 39 of the cylinder chamber 38 constituting the air damper mechanism 40 acts as an orifice, drastic movement of the spindle 5 is restricted. Therefore, reading errors of the encoder 12 do not occur.

In this state, the measurement head 20 is inserted into the inner surface of the hole of the object to be measured (not shown), and the force with which the lever 35 is gripped is loosened. As a result, the plunger 29 is urged in the direction of the spindle 5 by the urging force of the coil spring 31, and the probe 22 is moved in the opposite direction to the above via the spindle 5 and the cone 24, and the contact 23 of the probe 22 is moved. It comes into contact with the inner surface of the hole.

At this time, the partition member 30 is also moved together with the plunger 29, and pressure is generated in the cylinder chamber 38. However, since the through hole 39 acts as an orifice, the plunger 29 is moved slowly, and the spindle 5, cone 24, and probe 22 suddenly move. movement will be regulated.

Here, before bringing the contact 23 into contact with the inner surface of the hole, the frame 16 is rotated relative to the display main body 3 to set the display 15 at a position where it can be easily viewed. When the frame body 16 rotates, the flat cable 14 acts to move sequentially to the display unit main body 3 side and the frame body 16 side exactly at the folded part, so a large rotational force is not required. .

Moreover, the substrate 11 attached to the main body 3 and the frame 16
．． 34 and generates a close force, no tensile force or the like is generated at both ends of the flat cable 14, thereby avoiding disconnection or terminal disconnection, and the rigidity of the cable 14 prevents it from returning.

Furthermore, when the hold switch 19A of the second switch group 19 on the display main body 3 side is operated with the hand holding the handle IA, an input is sent from the encoder 12 to the electrical component 13 and the display 15 The measured values that change sequentially and are displayed are held.

On the other hand, by gripping the handle IA with the thumb facing away from the display main body 3 of the casing 1 and performing the same operation as described above, it is possible to change the gripping posture and perform measurements. On this occasion,
The second switch group 19 is operated by pressing the hold switch 19A, etc. on the side opposite to the display part of the handle part IA. Even if the gripping posture is changed, the switches 19A and 19B will not be pressed by mistake.

According to this embodiment, the operating lever 35 and the first
By operating the second switch group 18 and 19, accurate inner diameter measurement can be performed. Moreover, when measuring the hole inner diameter with an electronic display type inner diameter measuring device, the first switch group 18 for setting measurement conditions is replaced by the displacement measurement display means 2, and the second switch group for operation during measurement is used.
Since the switch group 19 is arranged separately on the handle part IA,
The switch can be operated with one hand without malfunctioning.

Moreover, the second switch group 19 is divided into two sets, and the handle part I
Since it is placed at A, the following steps are taken from the relationship of the hole position of the object to be measured.
By using the opposite hand, sufficient measurements can be made even if the measurement posture is changed. Therefore, even if the snap-type internal diameter measuring device is replaced with an electronic display type, operability can be improved and accurate measurements can be made. Further, according to this embodiment, the second switch group 19 is
They are placed near the display body 3 of the casing 1 and near one end of the casing away from the display body 3, and these are point symmetrical with respect to the handle IA, so that the switch cannot be seen. It can be operated reliably even when measuring deep holes. Furthermore, since the frame 16 is rotatably attached to the display main body 3, the display 15 can always be set at a position where it can be easily seen regardless of the measurement posture, and operability can also be improved from this point of view. Further, the flat cable 14 is connected to guide surfaces 11A and 34A of the display main body 3 and the substrate 11.34 of the frame 16.
Since the flat cable 14 is in contact with the
No tensile force or the like is generated at both ends of the wire, and therefore wire breakage, terminal dislodgement, etc. can be avoided. This means that the flat cable 14 can be made of multiple layers, and has the advantage that it can be used as is even in a type with a large number of wires. Furthermore, since the flat cable 14 is shaped like an arc, the internal space can be made thicker.

In addition, even if the display main body 3 and the frame body 16 are separated, the flat cable 14 extends in the axial direction, so disassembly for repair or adjustment can be done with the flannel 1 to the cable 14 connected.
Further, since parts can be assembled after wiring the flat cable 14, assembly and disassembly are extremely easy. Furthermore, the air damper mechanism 40 causes the spindle 5 to
This prevents the spindle 5 from overspeeding, prevents the probe 22 from suddenly colliding with the inner diameter of the hole of the object to be measured, avoids detection errors of the encoder 12, and improves measurement accuracy. Improvements can be made. Moreover, since the spindle 5 and the plunger 29 are provided separately, (1) the unreliable operation of the plunger 29 is not affected by the spindle 5 by the operation lever 35, and (2) the dimensions of the spindle 5 can be made relatively short. This allows for better support of the spindle 5 and reduces errors due to thermal expansion. Furthermore, in this embodiment, since the contact portion between the plunger 29 and the operating lever 35 is constituted by the ring 42), the arc-shaped operating lever contact portion 35A, and the pin 43, the plunger 35 is allowed to move in the axial direction. Furthermore, since the ring 42, pin 43, etc. do not slide relative to the plunger 29, there is less wear on these parts. Therefore, it is possible to prevent a decrease in measurement accuracy due to wear of the ring 42 and the like. Furthermore, since the lever 35 is brought into contact with the plunger 29 by the spring 37, it is possible to prevent the lever 35 from wobbling and, furthermore, from malfunctioning during measurement. Furthermore, inside the casing 1 where the handle part IA is formed, there is a spindle 5 and a scale 7 that are directly involved in measurement.
．． 8 etc. are not arranged, the effect of thermal expansion caused by gripping the handle portion IA does not directly act on the spindle 5 etc.

Note that in the present invention, the second switch group 19 is
In A, the vicinity of the display main body 3 and this display main body 3
It is not necessarily necessary to arrange the switches in two groups, one near one end in the direction away from the other end, and it is sufficient if the switch group of the same mechanism is provided in multiple positions. It may be provided in the center of the IA or elsewhere.

Furthermore, the frame 16 may be made unrotatable relative to the display main body 3, and the display 15, the electrical components 13, etc. may be wired using a normal cable instead of the flat cable 14. However, if the flat cable 14 is used as in the embodiment described above, the above-mentioned effects can be obtained. Furthermore, the encoder 12 is not limited to a capacitance type, but may be of any type, such as a photoelectric type equipped with a light receiver, a light emitter, etc., or an electromagnetic type or a magnetic type.

〔Effect of the invention〕

According to the present invention as described above, even if the snap-type inner diameter measuring device is made into an electronic display type, operability can be improved, and
This has the effect of allowing accurate measurements to be made.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an embodiment according to the present invention, Fig. 2 is a front view of the embodiment, and Fig. 3 is a partially cutaway diagram showing the schematic structure of the attachment of the frame and display main body. 4 is a plan view of the flat cable, and FIG. 5 is an exploded perspective view showing a retaining portion between the spindle abutting member and the operating means. IA...handle portion, 2...displacement measurement display means, 12.
...Encoder, 15...Display device, 18...First switch group, 19...Second switch group, 21...
Head main body as a measuring element support part, 22... measuring element,
7o... Measuring machine body. Agent: Patent attorney Minoru Kinoshita (one person) Figure 3 Figure 4

Claims (2)

[Claims] (1) A measuring device main body having a contact point support portion formed at one end and a handle portion formed at the other end, supported by the contact point support portion of the measuring device main body, and perpendicular to the axial direction of the measuring device main body. a measuring element that is movable in a direction such that it can come into contact with the inner surface of a hole in the object to be measured; an encoder that is provided in the intermediate part of the measuring device body and that can measure the amount of displacement of the measuring element; and measurement using this encoder. A displacement measurement display means having a display for displaying the contents, and a first means for setting measurement conditions that is provided in the displacement measurement display means and is operated before starting measurement.
a second switch group for operation during measurement, which is provided on the handle of the measuring instrument main body and is operated during measurement;
a measuring stylus operating means provided on the handle of the measuring machine main body and configured to move the measuring stylus in a direction orthogonal to the axial direction of the measuring machine main body; An inner diameter measuring machine characterized in that there are a plurality of sets of switches each having the same mechanism. (2) In claim 1, the second switch group is arranged at a position near the displacement measurement display means and at a position near the other end of the probe main body, which is remote from the displacement measurement display means. are provided in two locations respectively, forming two sets, and
An inner diameter measuring machine characterized in that the switches in the two second switch groups are arranged point-symmetrically with respect to the handle.