JPS6033025Y2 - Universal parallel ruler equipped with scale alignment means - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a universal parallel ruler equipped with scale alignment means that allows the rotation angle of the scale to be easily read.

Conventionally, there is a known method for reading the rotation angle of a scale by aligning the vernier scale on the scale side with the minute scale on the head support side. It is not always easy to read the scale, and there are problems in terms of visibility, speed, and accuracy.Recently, means for digitally displaying the rotation angle of the scale have been proposed.

However, the above-mentioned digital display means requires means for A-D conversion in the relative rotation section between the head support side and the scale side, which not only requires major modification of the head but also requires a large and complicated structure. The reality is that further technological development is required in terms of practicality.

Therefore, the present invention provides a universal parallel ruler that is equipped with a scale alignment means that allows the rotation angle of the scale to be easily seen and read quickly and accurately by simply adding structurally simple technical means to the conventional head. This is what I am trying to do.

The present invention will be described in detail with reference to examples below. In FIG. ing.

Reference numeral 5 denotes a head support portion that is separably connected to the parallel link mechanism 4, and rotatably supports the operating head 6.

A scale mounting plate 8 rotates together with the operation head 6 via a base plate 7, and scales 9a and 9b are also rotated together with this.

1 in the clockwise direction and 1 in the counterclockwise direction on the head support part 5 side.
A protractor dial 10 with a minute scale 10a of 80° is provided, and correspondingly, a vernier scale 11 of 60' in the clockwise and counterclockwise directions is provided with an indicator on the scale side.
A vernier scale plate 11 is provided, and conventionally, the rotation angle of the scale was read by matching the minute scale 10a with the vernier scale 11a.

Here, in the universal parallel ruler according to the present invention, FIGS.
As clearly shown in the figure, an extended degree scale 10b is provided on the outside of the degree scale 10a of the protractor plate 10, while a vernier scale plate 1
1 is made of a transparent member, and its vernier scale 11a is provided at a position where it can overlap the extended minute scale 10b.

Therefore, from each vernier scale 11a, there is an extended minute scale 10b.
can be seen through.

In the case of the embodiment, the vernier scale plate 11 is made of a thin plate made of transparent glass, and the scale lines of the vernier scale 11a may be made transparent or opaque.

When the vernier scale 1a is made transparent, if a lens-like convex surface for magnification is provided along the scale line, the overlapping degree scale 11b can be viewed in an enlarged manner.

In FIG. 4, the vernier scale plate 11 is connected to a support base 13.
The vernier scale 11a at the tip is located above the extended degree scale 10b provided by the steps of the protractor 10,
It is opposite to the minute scale 10a portion on the inner circumference of 0.

Reference numeral 15 is a cover integrally fixed to the substrate 7 with screws 16, and the upper part of the vernier scale plate 11 is covered with a transparent dustproof cover 17.

Incidentally, in the above embodiment, the vernier scale plate 11 is made of a thin plate made of transparent glass, but the point is that it is transparent and has light transmittance so that the degree scale 10b where the bent vernier scale 11a overlaps can be visually recognized. Of course, an alternative material such as a transparent plastic plate or the like may be used.

In addition, the vernier scale plate 1 is made of a thin metal plate such as stainless steel.
1, it is easy to undergo deformation in terms of strength, so
It is difficult to drill the see-through scale all the way to the edge of the vernier scale 11a, and it is necessary to insert a reinforcing plate when fixing it to the substrate 7, but in the case of the vernier scale plate 11 made of glass or plastic of the present invention, This has the advantage that the vernier scale 11a can be provided up to its edge, and that no reinforcing plate is particularly required when fixing as described above.

In addition, 18 is a dustproof cushion provided between the protractor plate 10 and the dustproof cover 17, 19 is an index plate integrated with the protractor plate 10, 20 is an indexing claw that engages with the index plate 19, and 21 is the head part. It is the back cover.

According to the universal parallel ruler of the present invention having the above configuration, each vernier scale 11a is provided superimposed on the degree scale 10b, so for example in the case of FIG.
Since the vernier scale indicator 0' coincides with 0' and 60', and the minute scale 10b is visible from the vernier scale 11a between 0' and 60', it can be immediately read that the rotation angle of the scale is 06. In the case of Fig. 3, the vernier scale indicator O' is located between 5° and 6° of the minute scale 10a in the counterclockwise direction, and the vernier scale indicator O' is located between 5° and 6° of the minute scale 10a in the counterclockwise direction. Since the scale 10b is visible, it can be immediately read that the rotation angle of the scale is 5°40'.

In the case of FIG. 3, the minute scale 10b is also visible from the vernier scale in the clockwise direction 20', which is 60' apart from the vernier scale, so that alignment of the scales can be confirmed.

In addition, the circumference of the vernier scale 11a of the vernier scale, minutes'
Of course, it is also possible to provide the scale 10b and its surroundings with appropriate coloring, fluorescent paint, etc. so that the matched minute scale can be read more easily.

As described above, according to the universal parallel ruler according to the present invention, the extended degree scale 10b is provided outside the degree scale 10a of the protractor board 10, and as a result, the outer diameter of the protractor board 10 can be increased. Even so, the transparent vernier scale plate 11 overlaps the extended minute scale 10b, and the vernier scale 11a abuts against the inner minute scale 10a, as is the conventional configuration. It is possible to prevent the scale from increasing in size, and the rotation angle of the scale can be read by matching the minute scale 10a and the vernier scale 11a as in the conventional case, and at the same time, it can be seen at a glance by overlapping with the extended degree scale 10b. It has the effect of being easy to read, and is extremely effective in making drafting work efficient and smooth.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the universal parallel ruler according to the present invention, Fig. 2 is a schematic plan view showing the main parts in an enlarged manner, and Fig. 3 is a schematic plan view showing the principle in principle with the main parts enlarged. The plan view and FIG. 4 are longitudinal cross-sectional views showing a part of the embodiment. 10a, 10b...minute scale, 10...
・Protractor board, 11...Vernier scale plate, 11a・
...Vernier scale.

Claims (1)

[Scope of utility model registration request] An extended minute scale 10b is provided with a step outside the degree scale lea of the protractor 10 on the head support side, while a vernier scale 11a is provided on the scale side that can rotate relative to the head support side. A transparent vernier scale plate 11 is provided, and the vernier scale 11a is installed so as to overlap the extended degree scale 10b having a step and to face the inner degree scale 10a without a difference in step. A universal parallel ruler equipped with a scale alignment means that allows the rotation angle of the scale to be read by aligning the vernier scale 11a with the opposing minute scales 1a and 10b.