JPH05286299A - Circle drawing apparatus - Google Patents

Abstract

PURPOSE:To obtain a circle drawing apparatus which can draw a circle of an arbitrary diameter without leaving the same impression of a needle as that of a compass on the center of the circle on drawing paper or the like. CONSTITUTION:A rotating plate 3 is rotatably and slidably set to an outer frame plate 2. A guide groove 4 is made in the rotating plate 3 in a radial direction of rotation. A writing utensil holder 5 slidable in the radial direction of rotation along the guide groove 4 is set to the guide groove 4. The writing utensil holder 5 is provided with a stopper mechanism 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for drawing a circle drawing on a drawing sheet, etc. The present invention relates to a circle diagram making device capable of drawing a circle diagram.

[0002]

2. Description of the Related Art Conventionally, a compass has been widely known as a device for drawing a circle drawing on a drawing sheet, but in addition to this, a plurality of circular holes having different diameters are formed on a thin plastic plate. So-called circular hole rulers are known, and all of them are put to practical use.

The compass has two legs that can be freely opened and closed, a needle is attached to the tip of one leg, and a drawing pen or pencil lead is attached to the tip of the other leg. In use, the needle attached to the tip of one leg is attached to the surface of the drawing sheet or the like, and the lead of a drawing pen or pencil attached to the tip of the other leg is attached to the surface of the drawing sheet or the like. And
Draw a predetermined circle on the surface of the drawing paper, etc., by turning the other leg, with the core of the drawing pen or pencil, around the leg with the needle attached, along the surface of the drawing paper, etc. be able to. The compass has the feature that a circle diagram with an arbitrary diameter can be drawn by adjusting the opening / closing angle of the legs.

In the circular hole ruler, a plurality of circular holes having different diameters are formed on a thin plastic plate. In use, a circular hole with a predetermined diameter formed on a circular hole ruler is placed on a drawing sheet, etc., and the core of a drawing pen or pencil is moved along the circumference of the circular hole, so that the drawing sheet, etc. A predetermined circle diagram can be drawn on the surface of.

[0005]

The compass has the feature that a circle drawing of an arbitrary diameter can be drawn by arbitrarily adjusting the opening / closing angle of the legs, but on the other hand, When drawing a circle drawing, since the needle at the tip of the leg is attached to the center position of the circle on the surface of the drawing paper or the like, there is a drawback in that the surface of the drawing paper or the like is always scratched by the needle.

On the other hand, when the circular hole ruler is used, it is possible to eliminate the disadvantage of using a compass, that is, the defect that the surface of a drawing sheet or the like can be scratched by a needle. However, on the other hand, since the diameter of the circular hole formed in the circular hole ruler cannot be changed arbitrarily, it is not possible to draw a circular diagram of an arbitrary diameter like a compass, and it is formed in the circular hole ruler. There is a drawback that it cannot be used at all when drawing a circle diagram of a non-diameter.

The present invention has been made in view of the above-mentioned problems and was devised to solve the problems. The purpose of the invention is to draw the advantage of a compass, that is, a circular diagram of an arbitrary diameter. On the other hand, it is possible to avoid the defects of the compass, that is, the scratches on the surface of the drawing paper, etc. due to the needle, and to avoid drawing a scratch on the drawing paper etc. with a needle at the center of the circle like a compass. The purpose is to provide a circle drawing tool that can draw a circle.

[0008]

In order to achieve the above object, the present invention mounts a rotary plate on an outer frame plate so as to be rotatable and slidable, and forms a guide groove in a rotary radial direction on the rotary plate, The writing tool holder, which is slidable in the radial direction of rotation along the guide groove, is mounted in the guide groove, and the writing tool holder is provided with a stopper mechanism. Here, the writing tool means a tool such as a pen or pencil used for drawing a circle.

[0009]

The present invention having the above construction operates as follows. That is, the circle drawing making tool is placed at a place where a circle drawing is drawn on the surface of the drawing paper, the stopper mechanism is released, and the writing instrument holder is slid in the radial direction along the guide groove.
After sliding the writing instrument holder from the center of rotation to a predetermined position, fix the writing instrument holder in that position by the stopper mechanism, and fix the writing instrument such as a pen or pencil to the writing instrument holder with the pen tip facing down. The circular diagram making tool according to the present invention draws a flaw trace by the needle at the center of the circular diagram by rotating the rotating plate once after the pen tip of the writing instrument is brought into contact with the surface of the drawing sheet etc. It works so that you can draw a circle with an arbitrary diameter without attaching it to paper.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below based on the embodiments shown in the drawings. Here, FIG. 1 is a plan view of the circle drawing preparation instrument, FIG. 2 is a rear view of the circle drawing preparation instrument, and FIG. 3 is FIG.
4 is an end view taken along the line AA of FIG. 4, FIG. 4 is an end view taken along the line BB of FIG.
FIG. 5 is an enlarged perspective view of a partial main part of the circle drawing making tool, and FIG. 6 is a perspective view of the writing instrument holder.

In the drawings, a circle drawing creating device 1 according to the present invention is a device which can draw a circle drawing of an arbitrary diameter without attaching a scratch mark by a needle to a drawing sheet at the center of the circle drawing,
The outer frame plate 2, the rotary plate 3, the guide groove 4, the writing instrument holder 5, the stopper mechanism 6, and the like are included.

The outer frame plate 2 has a circular annular outer shape, and a large circular hole is formed in the center thereof. The outer frame plate 2 is a member that guides and holds a rotating plate 3 described later so as to be rotatable and slidable. The outer frame plate 2 is made of, for example, a plastic material having a small thickness, the periphery thereof is formed in a flat plate shape in the radial direction, and the outer peripheral edge is thickened in the thickness direction.

A plurality of rollers 2a are attached downwardly at regular intervals in the circular direction on the lower surface of the area of the outer frame plate 2 formed in a flat plate shape in the radial direction. The roller 2a functions to contact the outer peripheral edge of the rotating plate 3 and smooth the rotation of the rotating plate 3. Also, the outer frame plate 2
At one end of the outer periphery of the drawing machine mounting metal fitting 2b is provided so as to project outward.

A thin rotary plate 3 is rotatably slidably mounted in the circular center hole of the outer frame plate 2.
The rotating plate 3 is formed with a thin circular annular outer peripheral edge region that is inscribed in the circular central hole of the outer frame plate 2, and the inner connecting plate is formed in a cross shape inside the circular annular outer peripheral edge region. It is formed integrally. A guide groove 4 is formed in one of the inner connecting plates in the radial direction of rotation.

The guide groove 4 is formed on a straight line extending in the radial direction from the center of rotation of the rotary plate 3. The guide groove 4 has a constant groove width and is formed in a linear shape, and both ends in the longitudinal direction thereof are formed in an arc shape.

A transparent plate 4a is attached to the center of rotation of the rotary plate 3 at one end of the guide groove 4, and a centering line 4b is drawn in a cross shape on the surface of the transparent plate 4a. The transparent plate 4a is adjusted and attached so that the cross-shaped center thereof coincides with the center of the rotary plate 3.

A writing instrument holder 5 is mounted in the guide groove 4. The writing instrument holder 5 is mounted slidably in the radial direction along the guide groove 4. The writing instrument holder 5 is a device for attaching a writing instrument a such as a pen or pencil for drawing a circle diagram,
A hole for attaching the writing instrument a is formed in the vertical direction. The writing implement holder 5 has a structure in which these writing implements a are fixed and held so as not to shift during the drawing of a circle. For example, in the embodiment of the drawings, the writing implement a
It is formed in a structure capable of being fixedly held by screwing the tip side of the.

The writing instrument holder 5 has a box-shaped upper holding frame 5 so that the writing instrument a fixedly held can be moved downward.
It is composed of a and a lower sliding frame 5b. Upper holding frame 5
A mounting hole for holding and fixing the writing tool a is formed in a, and the writing tool a is mounted and held and fixed in this mounting hole.

An upper holding frame 5a constituting the writing instrument holder 5
The lower sliding frame 5b is attached so as to fit vertically. In addition, the lower sliding frame 5b is provided inside the upper holding frame 5a.
A spring 5c that comes into contact with is internally provided. The upper holding frame 5a is elastically held upward by the lower sliding frame 5b by the spring 5c, and when the writing tool a is held and fixed to the upper holding frame 5a, the pen tip of the writing tool a is placed on the surface b of a drawing sheet or the like. It does not come into contact.

A leaf spring is extended laterally on the side surface of the upper holding frame 5a, and a handle 5d is provided on the upper surface of the tip end side of the leaf spring. The handle 5d is used for gripping and rotating the rotating plate 3 when rotating the rotating plate 3, and is also used as a retainer when the pen tip of the writing instrument a is brought into contact with the surface b of a drawing sheet or the like.

That is, by pushing the handle 5d downward, the upper holding frame 5a holding and fixing the writing implement a is moved downward against the spring 5c, and the pen tip of the writing implement a is placed on the surface b of a drawing sheet or the like. When the circle drawing is made by bringing them into contact with each other and the handle 5d is released after the circle drawing is made, the upper holding frame 5a is pushed upward by the biasing force of the spring 5c, and the writing instrument a
The pen tip is away from the surface b of the drawing paper or the like.

Guide grooves 4 are provided on the left and right of the lower surface of the lower sliding frame 5b.
Each roller 5e is attached downward so as to smoothly slide inside. Each roller 5e contacts the side surface of the guide groove 4 and rotates, so that the writing instrument holder 5 can smoothly slide in the guide groove 4 in the rotation radius direction.

The stopper mechanism 6 fixes the writing instrument holder 5 at a predetermined position of the guide groove 4, and is provided on the side surface of the lower sliding frame 5b opposite to the side where the handle 5d is attached. The stopper mechanism 6 includes a lever 6a and the lever 6a.
The stopper claw 6b is controlled by the operation of. The stopper claw 6b is in the guide groove 4, and is rotated by the operation of the lever 6a so that the tip end of the stopper claw 6b abuts on both left and right side surfaces of the guide groove 4, so that the writing instrument holder 5 is guided to the guide groove 4. Performs the function of fixing.

Next, a method of using the circle diagram drawing instrument based on the configuration of the above embodiment will be described below. First, the circle drawing preparation tool 1 is placed on the surface b of a drawing sheet or the like where a circle drawing is drawn, and the lever 6a of the stopper mechanism 6 is operated to fix the writing tool holder 5 fixed in the guide groove 4. To cancel.
In this case, if the writing implement a is not yet fixedly held in the writing implement holder 5, the writing implement a is attached.

Subsequently, the writing instrument holder 5 is slid in the radial direction along the guide groove 4, and the writing instrument holder 5 is slid from the rotation center of the rotary plate 3 to a predetermined position. In this case, since the scale c is formed on both sides of the guide groove 4, the writing instrument holder 5 is moved to a position corresponding to the radius of the circle by using the scale c. Then, the lever 6a of the stopper mechanism 6 is operated to bring the stopper claws 6b into contact with the left and right side surfaces of the guide groove 4, and the writing instrument holder 5 is fixed at that position.

A spring 5c is provided between the upper holding frame 5a and the lower sliding frame 5b of the writing instrument holder 5, and the pen tip of the writing instrument a does not come into contact with the surface b of a drawing sheet or the like by the bias of the spring 5c. Therefore, the handle 5d is pressed to bring the nib of the writing instrument a fixedly held by the writing instrument holder 5 into contact with the surface b of the drawing sheet or the like against the bias of the spring 5c.

Then, after confirming that the pen tip of the writing instrument a has come into contact with the surface b of the drawing sheet or the like, the rotary plate 3 is rotated once while being held by the handle 5d.
The pen tip draws a circle in a state of contacting the surface b of the drawing paper or the like, and a circle drawing is created on the surface b of the drawing paper or the like. At this time, the surface b of the drawing paper or the like is not scratched by the needle. In this way, it is possible to draw a circle diagram of an arbitrary diameter without attaching a scratch mark by the needle to the surface b of the drawing sheet or the like at the center of the circle diagram.

The present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the invention. In the above example,
The rotating plate 3 has been described in the case where the outer periphery thereof is a circle inscribed in the outer frame plate 2, but the rotating plate 3 is not limited to this. For example, the rotating plate 3 has a cross shape, and each tip of the cross shape has a cross shape. The structure may be inscribed in the outer frame plate 2, and conversely, when the outer shape of the rotating plate 3 is circular, the outer frame plate 2 may not be a complete ring but may be partially open.

[0029]

As is apparent from the above description, according to the circle drawing making tool of the present invention, the outer frame plate is rotatably slidably mounted on the rotary plate, and the rotary plate is provided with guide grooves in the radial direction of rotation. By installing a writing instrument holder that is slidable in the radial direction of rotation along the guide groove in the guide groove and providing a stopper mechanism on the writing instrument holder, the advantage of the compass While you can draw
It is possible to avoid the defect of the compass, that is, the scratches caused by the needle on the surface of the drawing paper or the like. Thus, unlike the conventional compass, it is possible to draw a circle drawing of an arbitrary diameter without attaching a scratch mark by a needle to the drawing sheet or the like at the center of the circle drawing, which is an extremely new and beneficial effect. ..

[Brief description of drawings]

FIG. 1 is a plan view of a circle drawing drawing tool showing an embodiment of the present invention.

FIG. 2 is a rear view of the circle drawing instrument showing the embodiment of the present invention.

FIG. 3 is an end view taken along the line AA of FIG.

FIG. 4 is an end view taken along the line BB of FIG.

FIG. 5 is an enlarged perspective view of a partial main part of a circle drawing making tool showing an embodiment of the present invention.

FIG. 6 is a perspective view of a writing instrument holder showing an embodiment of the present invention.

[Explanation of symbols]

 1 Circle drawing device 2 Outer frame plate 2a Roller 2b Drafting machine mounting bracket 3 Rotating plate 4 Guide groove 4a Transparent plate 4b Centering line 5 Writing tool holder 5a Upper holding frame 5b Lower sliding frame 5c Spring 5d Handle 5e Roller 6 Stopper Mechanism 6a Lever 6b Stopper claw

Claims (1)

[Claims] 1. A writing instrument holder, wherein a rotary plate is rotatably slidably mounted on an outer frame plate, a guide groove is bored in the rotary plate in a radial direction of rotation, and the rotary holder is slidable in the radial direction of rotation along the guide groove. Is attached to the guide groove, and the writing instrument holder is provided with a stopper mechanism.