JPH079041Y2 - V-shaped groove thickness gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a plate thickness for measuring a plate thickness (residual thickness) of a groove portion in which V-shaped grooves facing each other are formed on both sides of a thin plate material such as a printed circuit board. The present invention relates to a measuring instrument, and particularly to its measuring element.

(Prior Art) As a conventional technology, there is a structure shown in FIG. 4 or FIG.

First, as shown in FIG. 4, the arm 2 is erected and supported on the base 1, and the upper end portion of the arm 2 is arranged above the base 1.

The dial gauge 3 is erected on the upper end of the arm 2 with the spindle 3a thereof facing downward, and the support body 4 facing the spindle 3a is attached to the base 1 side. The conical measuring elements 5 and 6 are erected and fixed on the lower part and the support 4 so as to face each other.

The taper angle of each of the measuring elements 5 and 6 is smaller than the groove angle of the V-shaped grooves 11 and 12 formed on the plate member 10 shown in FIG. 6, for example, the groove angle of the V-shaped grooves 11 and 12 is 30. In the case of degrees, there is a structure in which the taper angles of the tracing stylus 5 and 6 are set to 25 degrees.

Further, as shown in FIG. 5, the structure is such that plate-shaped measuring elements 7 and 8 whose ends are formed in a V-shaped cross section are opposed to each other and are supported by the spindle 3a and the support 4 of the dial gauge 3 described above. was there.

(Problems to be Solved by the Invention) The conical measuring elements 5 and 6 shown in FIG.
Since it locally contacts the bottom of the groove 12, it reliably contacts the bottom of the V-grooves 11 and 12.

However, since the conical stylus 5 and 6 have high bending rigidity and contact with a small area, as shown in FIG.
If the upper and lower V-grooves 11 and 12 formed on the plate member 10 are laterally offset, the tracing stylus 5 and 6 may be bent and broken, or one of the tracing stylus (5) may have one of the V-grooves (11). There was a drawback that it fell on the middle of the slope and could not reach the bottom.

In addition, the plate-shaped probe 7.8 shown in FIG.
It will abut on the bottom of 12 in line along its length.

By the way, since the V-grooves 11 and 12 are usually cut by a circular saw, the bottoms of the V-grooves 11 and 12 are wavy as shown in FIG.

For this reason, the tip ends of the tracing stylus 7 and 8 straddle the apex of the corrugations, which makes it impossible to make accurate contact.

According to the present invention, even if the V-grooves formed on both sides of the plate material are slightly displaced in the lateral direction or the bottom of the V-groove changes in a wavy shape, the V-groove can always reliably come into contact with the predetermined V-groove bottom. The purpose is to obtain a new probe.

(Means for Solving the Problems) The present invention is configured as follows in order to achieve the above object.

That is, a pair of supporting bodies facing each other is provided on the frame, one supporting body is provided so as to be movable in a contacting / separating direction with respect to the other supporting body, and a tracing stylus is provided at a facing portion of each supporting body. In the V-shaped groove thickness measuring device, each of the measuring elements is a flexible disk measuring element in which a thin plate material is formed into a disk shape, and support shafts are provided in parallel with each other at opposing portions of each support. The disc probe is fitted and locked to the support shaft at its axial center.

(Operation) Since the present invention has the above-described configuration, the disc measuring element comes into point contact with the bottom surface of the V groove.

Further, when the bending rigidity in the lateral direction is reduced and the bottom portion of the V groove is displaced in the lateral direction, it flexes in the lateral direction along the slope of the V groove and comes into contact with the bottom portion while deforming.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a partial cross-sectional front view showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional side view thereof, and FIG. 3 is a partial cross-sectional view showing a contact state of a probe with a V groove. It is a front view.

In FIGS. 1 and 2, 1 is a base forming a frame, and 13 is a shaft-shaped upper support member, which can be moved up and down by being locked to the spindle 3a of the dial gauge 3 described above, for example.

Reference numeral 14 denotes a tubular bracket that is vertically fixed to the lower portion of the base 1, and a shaft-shaped lower support 15 is coaxially opposed to the upper support 13 in the bracket 14 so as to be slidably fitted thereto, and a locking bolt. Fixed by 16.

Ends of the upper support 13 and the lower support 15 facing each other, that is, the support shafts 17, 17 are respectively attached to the facing parts in parallel with each other in a horizontal direction. Mount the plate gauges 20 and 21 at the center.

In the present example, these disc measuring elements 20 and 21 are formed of a disc material having a thickness of 0.3 mm into a disc having an outer diameter of 28 mm. Tighten and fix with 18 ・ 18 to prevent it from coming off easily.

In addition, the outer diameter and wall thickness of the above-mentioned disc measuring elements 20 and 21 are plate materials.
A circular saw (not shown) for V-grooving is formed to have a size slightly smaller than the outer diameter and the width of the cutting edge.

According to the above-described embodiment, since the lower end of the disk probe 20 and the upper end of the disk probe 20 come into point contact with the bottom surfaces of the V-grooves 11 and 12 during measurement, they always contact the bottom surface reliably. It will be.

Further, since the bending rigidity in the lateral direction is reduced, when the bottom of the V-grooves 11 and 12 is displaced in the lateral direction, as shown in FIG. It deforms in the lateral direction and comes into contact with the bottom without breaking.

Further, when the contact portions with the bottoms of the V-grooves 11 and 12 are worn or broken, the disc stylus 20 and 21 are rotated about the support shafts 17 and 18 by a predetermined angle, and this portion is initially moved. It will function.

(Effect of the Invention) As is apparent from the above description, according to the present invention, even if the V-shaped grooves formed on both sides of the plate material are slightly displaced in the lateral direction or the bottom of the V-shaped groove is changed in a wavy shape, It is possible to always reliably contact the bottom of the V groove.

Further, when the contact portion with the bottom of the V groove is worn or broken, if the disc probe is rotated by a predetermined angle about its support axis, this portion will exert its original function,
This has the effect of extending the life of the probe.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of the present invention, FIG. 2 is a partial sectional side view thereof, and FIG. 3 is a main part front view showing a contact state of a probe to a V groove, FIG. 4 is a partially cutaway perspective view showing a first conventional example, FIG. 5 is a perspective view of a main part showing a second conventional example, FIG. 6 is a front view showing a plate material, and FIGS. It is a principal part front view which shows the contact state with the V groove of the conventional 1st example and the 2nd example. 1: Base (frame), 13: Upper support, 14: Bracket, 15: Lower support, 16: Stop bolt, 17: Support shaft, 18: Nut, 20: ・ 21: Disk probe.

Claims (1)

[Scope of utility model registration request] 1. A frame is provided with a pair of support members facing each other, and one support member is provided so as to be movable in a contacting / separating direction with respect to the other support member. In the V-shaped groove portion thickness measuring instrument provided with, each of the measuring elements is a flexible disk measuring element in which the groove plate material is formed in a disk shape, and is supported in parallel with the facing portions of the respective support members. A probe for a plate thickness measuring instrument having a V-shaped groove, wherein a shaft is provided and the disc probe is fitted and locked to the support shaft at its axial center portion.