JPH0114465Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a scale adhesion device that allows the entire back surface of the scale to be brought into close contact with the drawing surface in a flexible parallel ruler that allows the scale to be set at any angular position by operating the drafting head. It is related to.

Conventionally, the bottom plate of the drafting head of a universal parallel ruler has a downward slope toward the scale so that when the bottom plate is placed on the drawing surface, the entire back surface of the scale is in close contact with the drawing surface. A protrusion is closely installed to perform the function of

This type of protrusion may be integrally formed with the bottom plate, or may be clamped and fixed between the bottom plate and a scale mounting plate to which the bottom plate is attached.

By the way, in the case of the former type mentioned above, if the lower surface of the protrusion becomes worn, or if various scales of different thicknesses are replaced, the entire bottom plate must be replaced, which leads to an increase in costs. be. In addition, for the latter mentioned above,
If the bottom surface of the protrusion becomes worn, or if you replace scales with different thicknesses, it is not necessary to replace the entire bottom plate as in the former case, but it is necessary to remove the bottom plate from the scale mounting plate and replace the new protrusion. It was necessary to clamp and fix the scale between the bottom plate and the scale mounting plate, making the replacement work complicated.

Therefore, the present invention was proposed in view of the conventional situation, and the purpose is to make it possible to adjust the close contact of the scale to the drawing surface with a simple operation without removing the protrusions. .

That is, the present invention includes a drafting head, a scale mounting plate integrally assembled to the rotation center axis of the head, a scale attached to the scale mounting plate, and a bottom plate attached to the lower surface side of the scale mounting plate. The bottom plate has a rotary protrusion disposed in a hole formed in the bottom plate, a threaded part for screwing with the scale mounting plate is provided at the center of rotation of the protrusion, and an uneven part carved inside the hole. , and a corresponding uneven portion carved on the outer periphery of the projection to form a click mechanism that enables intermittent rotation of the projection, and by rotating the projection, the projection can be moved up and down. Accordingly, the amount of protrusion of the protrusion from the bottom plate can be variably adjusted.

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

FIG. 1 is a partially sectional side view showing the drafting head of the universal parallel ruler according to the present invention.

In this universal parallel ruler 1, a grip portion 3 is provided at the upper end portion of the drafting head 2.
This grip portion 3 is placed in a fixed state on a main shaft 4 which is a rotation center axis of the drafting head 2. A scale mounting plate 5 is attached to the lower end 4a of the main shaft 4 in the axial direction.
is attached and fixed with screws 6. A horizontal scale 7 and a vertical scale (not shown) are attached and fixed to the lower surface 5A of the outer end 5a of the scale mounting plate 5 with screws 8.

Further, in the scale mounting plate 5, a bottom plate 9 formed into a thin plate shape of synthetic resin is assembled and fixed to the lower surface 5B of the lower portion of the grip portion 3. The bottom plate 9 also functions as a covering plate to prevent dust from entering the head 2.

In the bottom plate 9, the main shaft 4 is placed between,
A circular hole 10 is provided on the side opposite to the side where the horizontal scale 7 and the vertical scale are provided, and a rotating protrusion 11 is provided in the hole 10.

As shown in FIGS. 2 and 3, the protrusion 11
A threaded portion 12 is provided upright on the upper end surface 11A. This threaded portion 12 is connected to the scale mounting plate 5.
A screw thread is screwed into a hole 13 formed coaxially with the hole 10 so as to be freely retractable. Further, an annular outward flange portion 14 is provided on the outer periphery of the projection 11.
is formed. The outer periphery of the flange portion 14 is provided with an uneven portion 15 by, for example, knurling.
is formed around the entire circumference.

The uneven portion 15 is fitted into an uneven portion 16 carved all around the inner circumference of the hole 10 . Note that, as described above, the bottom plate 9 is formed of synthetic resin into a thin plate shape, so that the peripheral portion 10A of the hole 10 has a flexible structure. Therefore, the protrusion 11
When a rotational force around the axis is applied to the hole 10, the uneven portion 16 on the hole 10 side is pushed in the outer radial direction by the uneven portion 15 on the protrusion 11 side.
The peripheral portion 10A of 0 is bent in the vertical direction to allow rotation of the protrusion 11. At this time, the above protrusion 1
1 is rotated intermittently due to the uneven portions 15 and 16. That is, the projection 11
and the hole 10 form a click mechanism 17.

In this way, by intermittently rotating the protrusion 11, the protrusion 11 can be moved in the vertical direction. The maximum value of the vertical movement amount of the protrusion 11 is set to the thickness of the bottom plate 9.

The lower end surface 11B of the protrusion 11 has a curved shape so as not to damage the drawing (not shown) attached to the drawing surface 18 when the drafting head 2 is moved along the drawing surface 18. is formed.

In this way, according to the projection 11, the projection 1
1 is worn out, and the bottom plate 9 of the protrusion 11 is worn out.
When the amount of protrusion from the protrusion decreases, by rotating the protrusion 11 intermittently, the protrusion 11 can be made to protrude further by the amount of wear.
For example, it becomes easy to adjust the close contact of the horizontal scale 7 to the drawing surface 18.

Further, even when replacing the scale with a scale having a different thickness, the amount of protrusion of the protrusions 11 can be adjusted to correspond to the replaced scale.

Furthermore, due to mechanical variations, an assembly error may occur between the scale mounting plate 5 and the horizontal scale 7, and either the horizontal scale 7 or the vertical scale may float off the drawing surface 18. Even if such a situation occurs, the error can be absorbed by the operation of protruding the projection 11.

Note that since the projection 11 is prevented from rotating by the respective uneven portions 15 and 16, the projection 11 is prevented from rotating.
1 will not rotate unexpectedly during drafting work, and the floating amount of the bottom plate 9 can be maintained at the set value. Further, if a scale indicating the amount of protrusion of the protrusion 11 in each unit is placed on the peripheral portion 10A of the hole 10 on the lower surface 9A of the bottom plate 9, it is possible to provide the protrusion 11 at each position of the intermittent rotation movement of the protrusion 11.
1 makes it easy to adjust the floating amount of the bottom plate 9.

As described above, according to the present invention, the amount of protrusion of the protrusion from the bottom plate can be variably adjusted by a simple operation without removing the protrusion, and the adhesion of the scale to the drawing surface can be easily adjusted. can.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view of the drafting head of a universal parallel ruler showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view showing its main parts, and Fig. 3 shows the drawing head with the protrusion removed. It is an enlarged sectional view showing a state. 1...Flexible parallel ruler, 2...Drawing head, 5...
...Scale mounting plate, 7...Horizontal scale, 9...
...Bottom plate, 10... Hole, 11... Rotating protrusion, 12...
...screw part, 15, 16... uneven part, 17... click mechanism.

Claims (1)

[Scope of utility model registration request] A drafting head, a scale mounting plate integrally assembled to the rotation center axis of this head, a scale attached to this scale mounting plate, a bottom plate attached to the bottom side of the scale mounting plate, and a hole formed in this bottom plate. a rotating protrusion disposed within the hole; a threaded portion for screwing with the scale mounting plate is provided at the center of rotation of the protrusion; and a concavo-convex portion carved on the inside of the hole; A click mechanism that enables intermittent rotation of the protrusion is formed by a concavo-convex portion carved on the outer periphery of the protrusion, and the protrusion is rotated by rotating the protrusion to move the protrusion up and down. A scale adhesion device for a flexible parallel ruler, characterized in that the amount of protrusion from the bottom plate can be variably adjusted.