JP2001021302A - Displacement measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a displacement measuring apparatus capable of nimble shift operation of a spindle with a lifting lever without being affected by the state of a contact surface of a stop screw and the state of an upper surface of the lifting lever. SOLUTION: In this displacement measuring apparatus, a spindle 4 which gives the amount of displacement by being supported slidably to a displacement measuring main body 6 is subjected to forced shifting by a lifting lever 3 which is operated from the outside. In this case, a thin hard resin plate 10 is interposed between a contact surface 8a of an operation end portion 4b of the spindle 4 with which surface a driving end portion 3a of the lifting lever 3 comes into contact and the driving end portion 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a displacement measuring device,
In particular, the present invention relates to an improvement in a lifting portion of a spindle for giving a displacement amount.

[0002]

2. Description of the Related Art Conventionally, in a thickness gauge using a dial gauge 1A, for example, as shown in FIG. The structure to be taken is taken. That is, the reference numeral “5A” in FIG. 4 is a holding frame to which the dial gauge 1A is fixed on the upper part,
An anvil 2A on which a sample such as a resin sheet can be placed is provided on the jaw 5a of the holding frame 5A, and a spindle 4A that is penetrated through the dial gauge body 6A is substantially constant on the surface of the anvil 2A. It is pressed at the measurement pressure.

A spindle 4A for giving a measurement displacement is slidably supported in its own longitudinal direction with respect to the dial gauge body 6A, and is located on the opposite side of the measurement end 4a pressed against the anvil 2A. The drive end 3a of the lift lever 3A is engaged with the operation end 4b. The lift lever 3A is pivotally supported at its intermediate portion by a pivot shaft 7a of a pivot bracket 7A on the upper side of the dial gauge main body 6A. The end 4b is shifted upward.
That is, the stop screw 8A is fixed to the operation end 4b of the spindle 4A, and the lift lever 3A is inserted into the annular groove 9A formed between the end flange 4c of the operation end 4b and the stop screw 8A. When the sample is attached to and detached from the anvil 2A, the drive end 3a is brought into contact with the stop screw 8A, thereby driving the spindle 4
A is shifted upward.

[0004]

However, there is a case in which the lifting operation of the spindle 4A by the lifting lever 3A described above causes a problem, and the vertical operation of the spindle 4A cannot be performed lightly. That is, during the actual shift operation, the spindle 4A is shifted with the upper surface 3c of the drive end 3a of the lift lever 3A in contact with the lower surface of the stop screw 8A, that is, the contact surface 8a. There is a difference in the motion trajectory between the upper surface 3c of the end 3a and the contact surface 8a of the stop screw 8A, and the upper surface 3c of the drive end 3a is brought into contact with the contact surface 8 of the stop screw 8A with the shift operation.
will slide with respect to a.

[0005] For this reason, the surface condition of the drive end 3a and the stop screw 8A, each made of metal, that is, the surface roughness has a great influence, so that light sliding becomes difficult, and the surface is slightly affected. Flaws and "burrs" during molding
In such a case, there is a problem that the contact resistance becomes extremely large, and a shift operation without "jerky" is inevitable.

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the conventional displacement measuring device, the object of the present invention is to use a lifting lever with a spindle without being influenced by the state of the contact surface of the stop screw or the upper surface of the lifting lever. The purpose of the present invention is to obtain a displacement measuring device that can shift lightly.

[0007]

In order to achieve the above object, the present invention provides a spindle which gives a displacement by being slidably supported on a displacement measuring device main body, and a lift which is operated from the outside. In a displacement measuring device forcibly shifting with a lever, a displacement measuring device in which a thin hard resin plate made of a low-friction material is interposed between a driving end of the lift lever lever and a contact surface of an operating end of the spindle with which the driving end of the lift lever is brought into contact. It proposes a vessel.

In the following description of a preferred embodiment of the present invention, 1) a spindle which gives a displacement amount by being slidably supported on a displacement measuring device main body is provided by a lift lever which is operated from the outside. In the displacement measuring device that is forcibly shifted, a structure in which the contact surface of the drive end of the lift lever that comes into contact with the operating end of the spindle is an approximate involute curved surface, 2) is contacted with the hard resin plate A structure in which the contact surface of the drive end is an involute curved surface will be described.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an enlarged view of an essential part corresponding to FIG. 5 of a thickness gauge according to the present invention. A driving end 3a of a lift lever 3 is engaged with an operating end 4b of a spindle 4 for giving a measurement displacement.

That is, as in the prior art, the lift lever 3 is attached to the pivot bracket 7 on the upper side of the dial gauge body 6.
The intermediate part is pivotally supported by a pivot shaft 7a of the above, and a stop screw 8 is fixed to the operating end 4b of the spindle 4,
A drive end 3a of the lift lever 3 is engaged with an annular groove 9 formed between the end flange 4c of the operation end 4b and the stop screw 8.

The feature of the illustrated embodiment is that the lift lever 3
Contact surface 8 between upper surface 3c of drive end 3a and stop screw 8
a, which is a hard resin plate 10 made of a low friction material interposed therebetween. That is, as shown in FIG.
Is formed by punching a sheet of polyamide or polyacetal into a disk shape, for example, and has a center hole 11 having a diameter corresponding to the neck of the stop screw 8. Since the hard resin plate 10 is partially cut by a cutting line 12 in the radial direction, a stop screw 8 is attached to the end flange 4c.
After being fixed, the rigid resin plate 10 can be pushed open from the cutting line 12 and positioned in the annular groove 9.

In the case of the illustrated embodiment, the driving end 3a described above is used.
The upper surface 3c (contact surface) of the drive end 3a is located below the drive end 3a so that the drive end 3a always comes into contact with a fixed position of the hard resin plate 10 at an arbitrary sliding angle about the pivot 7a. It consists of an involute surface with a center of curvature. Of course, the upper surface 3c having the involute surface may be an approximate involute surface indicated by three radii of curvature "R" in FIG.

In the embodiment shown in the drawings, the upper surface 3c of the drive end 3a of the lift lever is in contact with the hard resin plate 10 having a low coefficient of friction under the stop screw 8 because of the structure described above. . Therefore, even if the contact surface 8a of the stop screw 8 and the corresponding surface of the driving end 3a of the lift lever 3 have a rough surface or "burrs", the hard resin plate 10 having a small coefficient of friction has the upper surface of the lift lever 3 attached thereto. 3c comes into contact, so that a light frictional state occurs, and the lift lever 3 can be operated smoothly. This hard resin plate 10 has a cutting line 1
Since the 2 is formed, the operability of the lift lever 3 can be improved only by adding the hard resin plate 10 to an existing position.

The lift lever 3 of the embodiment shown in FIG.
Is provided with an upper surface 3c formed of an involute curved surface or an approximated curved surface of the involute curved surface. Therefore, as shown in FIG. It will come into contact with the plate 10. That is, the solid line in FIG. 3 shows the case where the spindle is lifted by 5 mm with the lift lever 3 and the two-dot chain line shows the case where the spindle is lifted by 10 mm. It is understood that the drive end 3a can be brought into contact with a substantially constant position of the hard resin plate 10 regardless of the operation angle of the lift lever 3 when the curved surface or the involute curved surface approximated surface is used. Therefore, if the contact position of the lift lever 3 with the stop screw 8 or the surface of the hard resin plate 10 becomes a fixed position, the friction between these members disappears when the lift lever 3 is operated, so that the sliding between these members is eliminated. Eliminates operational problems caused by movement. In particular, as shown in FIG.
If the drive end 3a is brought into contact, the bending moment applied to the spindle when the lift lever 3 is manually operated is eliminated, so that adverse effects on the spindle can also be avoided.

In the illustrated embodiment, an example in which the present invention is applied to a thickness gauge has been described. However, the present invention can be applied to other displacement measuring devices such as a depth gauge using a dial gauge. Needless to point out again.

[0016]

As is apparent from the above description, according to the present invention, a hard resin plate is interposed between the stop screw and the drive end of the lift lever, or By configuring the upper surface as an involute curved surface, trouble during operation of the lift lever is eliminated, and light operability is obtained.

[Brief description of the drawings]

FIG. 1 is an enlarged front view of a main part of a thickness gauge according to the present invention.

FIG. 2 is an enlarged perspective view of a resin plate used for the thickness gauge.

FIG. 3 is a view similar to FIG. 1 of the same thickness gauge when shifted by 5 mm.

FIG. 4 is an overall front view of a conventional thickness gauge.

FIG. 5 is an enlarged front view of a main part of the thickness gauge.

[Explanation of symbols]

 3 Lifting lever 3a Driving end 3c Upper surface 4 Spindle 4a Measuring end 4b Operating end 6 Dial gauge body 7 Pivot bracket 8 Stop screw 8a Contact surface 10 Hard resin plate

Claims (3)

[Claims] 1. A displacement measuring device for forcibly shifting a spindle, which is slidably supported by a displacement measuring device main body and gives a displacement amount, by an externally operated lifting lever. A displacement measuring device comprising a thin hard resin plate made of a low-friction material interposed between a driving end and a contact surface of an operating end of the spindle with which the driving end comes into contact. 2. A displacement measuring device in which a spindle which gives a displacement amount by being slidably supported with respect to a displacement measuring device main body is forcibly shifted by a lift lever which is externally operated. A displacement measuring device characterized in that a contact surface of a driving end of the lift lever contacted with an end is an approximate involute curved surface. 3. The displacement measuring instrument according to claim 1, wherein a contact surface of said drive end portion contacting said hard resin plate is an involute curved surface.