JPH0649908U - Centering device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a centering device 1a capable of efficiently obtaining the center point of the circle 21 on the base paper 20 in tracing work or the like. [Structure] The mark member 5 is attached to the center of the front surface side of the transparent plate 6a, and is pushed against the truncated cone-shaped elastic member 4 by a finger F, so that the needle 7 is projected to the back surface side of the transparent plate 6a. , The tip of the needle 7 can make a trace on the tracing paper 30 on the back side. A plurality of circumferential lines 12 with the needle 7 as a common center point are drawn on the transparent plate 6a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centering device used for finding a center point of a circle in a tracing operation such as creating a patent drawing from a schematic drawing.

[0002]

[Prior art]

 In tracing work such as creation of patent drawings, transparent or translucent tracing paper is placed on the base paper, the center point of the circle on the schematic diagram of the base paper is found, and the tracing paper is based on the found center point. A circle may be drawn on the top with a compass etc.

FIG. 10 is an explanatory diagram of a conventional method for obtaining the center point of a circle. First, (a) select arbitrary two points A and B on the circumference of the circle S for finding the center point, and (b) draw a perpendicular bisector H of the line segment AB. Next, in the same manner, (c) another two points a and b are selected, and (d) a vertical bisector h of the line segment ab is drawn. Thus, the point O at which the (2) vertical bisectors H and h intersect becomes the center point of the circle S. In FIG. 10, L and l are the distances between the line segment AB and the line segment ab, and T and t are the centers of the line segment AB and the line segment ab, respectively.

[0004]

[Problems to be solved by the device]

 The conventional method of finding the center point of a circle is complicated and inefficient. An object of the present invention is to provide a centering device that can efficiently find the center point of a circle in tracing work or the like.

[0005]

[Means for Solving the Problems]

 The invention will be described using the reference numerals of the drawings corresponding to the embodiments. In the centering device (1d, 1e) according to claim 1, a transparent plate (6d, 6e) through which a circle (21) for seeking the center is visible is marked with a transparent plate (6d, 6e). Mark points (14,15) as A plurality of circumferential lines (12) with the mark points (14, 15) as a common center are drawn on the transparent plate (6d, 6e).

[0006] In the centering device (1a) according to claim 2, a needle plate for marking a transparent plate (6a) through which the plane (20) for describing the center is displayed. An insertion hole (10) is formed which allows the mark means to be inserted and to be projected to the rear surface side of the transparent plate (6a). A plurality of circumferential lines (12) having the insertion hole (10) as a common center are drawn on the transparent plate (6a).

The centering device (1a-1c) according to claim 3 is a circle in which a circle (21) for seeking the center is displayed. A transparent plate (6a-6c) through which the plane (20) can be seen, and the transparent plate (6a-6c). A needle insertion hole (10) formed in the plate (6a-6c) and a plurality of circumferential lines drawn on the transparent plate (6a-6c) with the needle insertion hole (10) as a common center point. (12) and the contact sheet on the back side of the transparent plate (6a-6c) that is pushed into the needle insertion hole (10) against the elastic member (4) and protrudes to the back side of the transparent plate (6a-6c). A needle (7) for marking a needle trace on (20, 30).

[0008]

[Action]

 In the invention of claim 1, the position where the circumference line of the circle (21) on the circle describing plane (20) exactly matches any circumference line (12) on the transparent plate (6d, 6e), or Move the transparent plates (6d, 6e) so that they are almost in the same position. Then, a contact sheet (20) such as a tracing paper placed on the circle-marking plane (20) corresponding to the mark points (14, 15) of the transparent plate (6d, 6e) or on the circle-marking plane (20). Mark with a needle (7) etc. on the position above the (30).

According to the second aspect of the invention, a position where the circumference line of the circle (21) on the circle writing plane (20) exactly matches any circumference line (12) on the transparent plate (6a), Alternatively, the transparent plate (6a) is moved so that the transparent plate (6a) is almost in the same position. Then, the needle mark means is penetrated from the front surface side to the back surface side of the transparent plate (6a) in the insertion hole (10), and at the position of the tracing paper (30) corresponding to the position of the insertion hole (10) ( (When the tracing paper (30) is placed on the circle-marking plane (20)) or at the circle-marking plane (20) corresponding to the insertion hole (10) (centering device (1 a) When placed directly on the circular plane (20)), mark by means of needle-shaped marking means.

In the invention of claim 3, the transparent plate (6a-6c) is directly (on the circle description plane (20) on the circle description plane (20) on which the circle (21) for seeking the center is displayed. To find the center of the circle (21)) or indirectly on the circle describing plane (20) via tracing paper (30) placed on the circle describing plane (20). In the case of). Move the transparent plate (6a-6c) on the contact sheet (20, 30) (including not only the tracing paper (30) but also the circle-marking plane (20)) while sliding it, and mark the circle. The circumferential line of the circle (21) on the plane (20) is set at a position that exactly matches or almost matches any one of the circumferential lines (12) on the transparent plate (6a-6c). Then, the needle (7) is pushed in the needle insertion hole (10) against the elastic member (4), and the needle (7) is placed at a position on the contact sheet (20, 30) corresponding to the needle insertion hole (10). Make a needle mark at the tip.

[0011]

【Example】

 The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is an explanatory view of the use of the centering device 1a in tracing, and FIG. 2 is a view of the transparent plate 6a of FIG. 1 as seen from above. 1 and 2, the centering device 1a includes a substantially square transparent plate 6a, the transparent plate 6a has a small hole 10 (FIG. 2) in the central portion 9 (FIG. 2), and the transparent plate 6a has Vertical lines 2 and horizontal lines 3 orthogonal to each other in the small hole 10 and a plurality of circumferential lines 12 having the small hole 10 as a common center are drawn by printing. Vertical lines 2 and horizontal lines 3 are marked with scales X and Y each time they are separated from the small hole 10 by a distance corresponding to a multiple of the unit length (for example, 1 cm), and correspond to X and Y of the circumferential line 12. Those having a radius of radii are designated as thick circumferential lines 12b, and those having other radii are designated as circumferential lines 12a. A circle 21 from which the center point is to be obtained is displayed on the base paper 20 on which the schematic diagram is shown, a transparent or translucent tracing paper 30 is placed on the base paper 20, and the centering device 1a is Placed on tracing paper 30.

FIG. 3 is an exploded perspective view of a range including the small hole 10 of the transparent plate 6a of the centering device 1a, and FIGS. 4 and 5 show a range including the small hole 10 in a non-pressed state and a pressed state of the mark member 5, respectively. It is a vertical cross-sectional view shown by. The truncated cone-shaped elastic member 4 has a central hole 4a penetrating in the thickness direction, and a peripheral portion thereof is a tapered portion 4b, and the tapered portion 4b has lines 2a and 3a corresponding to the vertical line 2 and the horizontal line 3, respectively. Is entered. The mark member 5 has a disc portion 8 and a needle 7 protruding from the center of the disc portion 8. The truncated cone-shaped elastic member 4 is adhered to the central portion 9 of the transparent plate 6a on the larger bottom surface so that the central hole 4a coincides with the small hole 10, and the mark member 5 moves the needle 7 to the truncated cone-shaped elastic member. The disk portion 8 is adhered to the upper surface of the truncated cone-shaped elastic member 4, that is, the smaller bottom surface of the truncated cone-shaped elastic member 4, by inserting it into the central hole 4a of the circular truncated cone 4. When the mark member 5 is not pushed (FIG. 4), the tip of the needle 7 stays in the small hole 10 of the transparent plate 6a and does not project to the back surface side of the transparent plate 6a. On the other hand, when the mark member 5 is pressed by the finger F (FIG. 5), the truncated cone-shaped elastic member 4 is elastically compressed in the thickness direction, and the tip of the needle 7 has a small hole in the transparent plate 6a. A trace of the needle is attached to the tracing paper 30 by protruding from 10 to the rear surface side of the transparent plate 6a.

A method of using the centering device 1a will be described. A tracing paper 30 is placed on the base paper 20, and a centering device 1a is placed on the tracing paper 30. While fixing the tracing paper 30 to the base paper 20, move the transparent plate 6a while sliding the transparent plate 6a on the tracing paper 30 so that the circumference line of the circle 21 on the base paper 20 is on the transparent plate 6a. The position is set so as to exactly or almost match any one of the circumferential lines 12 of. At this time, the position of the small hole 10 coincides with the center of the circle 21 of the base paper 20, and while holding the centering device 1a in this state, the mark member 5 is pushed in by the finger F to make the tip of the needle 7 transparent plate. 6a is made to project from the back side, and the tip of the needle 7 marks the point on the tracing paper 30 corresponding to the small hole 10.

The centering device 1a of FIG. 1 is equipped with a truncated cone-shaped elastic member 4 and a mark member 5, but as shown in FIG. 2, the truncated cone-shaped elastic member 4 and the mark member 5 are omitted and only the transparent plate 6a is provided. It can also be used in. That is, in the transparent plate 6a in which the truncated cone-shaped elastic member 4 and the mark member 5 are omitted, instead of pushing the mark member 5 with the finger F, needle-shaped mark means such as a needle or a pencil heart is inserted into the small hole 10. Mark tracing paper 30.

FIG. 6 is a view of another centering device 1b viewed from above. The transparent plate 6b of the centering device 1b is approximately half the size of the transparent plate 6 of FIG. 1, and the lower half of the circumferential line 12 is omitted. The use of this centering device 1b is the same as that of the centering device 1a of FIG. 1, but it is more compact than that of the centering device 1a. In the centering device 1b, the truncated cone-shaped elastic member 4 and the mark member 5 are omitted, and a needle-shaped mark such as a needle or a pencil heart is placed in the small hole 10 after removing the truncated cone-shaped elastic member 4 and the mark member 5. Tracing paper 30 can be marked through the means.

FIG. 7 is a top view of the centering device 1c for finding the center point of a large circle. The transparent plate 6c is a rectangle long in the direction of the vertical line 2, the vertical line 2 is drawn only above the horizontal line 3, and the circumferential line 12 is drawn only in a part of the range centered on the vertical line 2. . Also in the centering device 1c, the truncated cone-shaped elastic member 4 and the mark member 5 are omitted, and the needle-shaped mark means such as a needle or a pencil heart is inserted into the small hole 10 after removing the truncated cone-shaped elastic member 4 and the mark member 5. The tracing paper 30 can be marked by inserting the.

FIG. 8 is a view of another centering device 1d viewed from above. This centering device 1d omits the truncated cone-shaped elastic member 4 and the mark member 5 of FIG. 1 and does not have the small hole 10 of FIG. The transparent plate 6d is a horizontally long rectangle, and only the upper half of the circumference line 12 is drawn.The point where the vertical line 2 intersects with the lower side of the transparent plate 6d is the mark point 14, and the circumference line 12 is the mark point. 14 is a common center. Although there is no particular indication on the transparent plate 6d that shows the mark point 14, the tracer can find the mark point 14 from the position where the vertical line 2 intersects with the lower side of the transparent plate 6d. When the center point of the circle 21 of the base paper 20 is obtained on the tracing paper 30 by this centering device 1d, the tracing operator finds that the circumference line of the circle 21 on the base paper 20 is one of the transparent lines on the transparent plate 6d. After moving the transparent plate 6d to a position that exactly fits the circumferential line 12 or a position that almost fits it, at the mark point 14, that is, at the position on the lower side where the vertical line 2 intersects the lower side of the transparent plate 6d, touch the needle and pencil etc. A needle mark or the like is attached to the tracing paper 30 by pressing the needle-shaped mark means against the tracing paper 30.

FIG. 9 is a view of another centering device 1e seen from above. In this centering device 1e as well, like the centering device 1d in FIG. 8, the truncated cone-shaped elastic member 4, the mark member 5 and the small hole 10 are omitted. The circumference line 12 is drawn only in the range of 90 ° on the transparent plate 6e, and the apex on the lower left side of the transparent plate 6e is not rounded but is angular, and as a mark point 15, the circumference line 12 of the circumference line 12 is drawn. It is a common center point. Although there is no particular indication on the transparent plate 6e that specifically shows the mark point 15, the trace operator can find the mark point 15 from the lower left corner of the transparent plate 6e. When finding the center point of the circle 21 of the base paper 20 on the tracing paper 30 with this centering device 1e, the tracing operator should find that the circumference line of the circle 21 on the base paper 20 is on any of the transparent plates 6d. After moving the transparent plate 6e to a position that exactly fits the circumferential line 12 of the transparent plate 6 or almost matches it, place the needle-like mark means such as a needle and a writing brush at the mark point 15, that is, at the lower left corner of the transparent plate 6e. Press on the tracing paper 30 and make marks such as needle marks on the tracing paper 30.

Although the illustrated embodiment describes the case of marking the center point of the circle 21 on the tracing paper 30, it eliminates the marking of the center point of the circle 21 on the base paper 20. is not.

[0020]

[Effect of device]

 As described above, in the inventions according to claims 1 to 3, a plurality of circumferential lines having the mark point, the insertion hole or the needle insertion hole as a common center are drawn on the transparent plate, and the circumference of the circle on the circle plane is described. Move the transparent plate to a position where any of the circumferential lines on the transparent plate is approximately in line with the line, and place it on the contact sheet (including the circular plane or tracing paper) that corresponds to the mark points. It is designed to be marked. Therefore, the center point of the circle can be efficiently obtained, and work such as tracing can be streamlined.

According to the third aspect of the invention, the centering device is equipped with a needle for marking a needle mark as a mark, and if the needle is pushed against the elastic member, the mark can be made on the plane described by the circle, one by one. It is possible to save the trouble of searching for a needle-shaped mark means such as a needle and to make the marking efficient.

[Brief description of drawings]

FIG. 1 is an explanatory view of using a centering device in tracing.

FIG. 2 is a view of the transparent plate of FIG. 1 seen from above.

FIG. 3 is an exploded perspective view of a range including a small hole of a transparent plate of the centering device.

FIG. 4 is a vertical sectional view showing a range including a small hole in a state where a mark member is not pressed.

FIG. 5 is a vertical sectional view showing a range including a small hole in a state where the mark member 5 is pressed.

FIG. 6 is a top view of another centering device.

FIG. 7 is a view from above of a centering device for finding the center point of a large circle.

FIG. 8 is a view from above of another centering device.

FIG. 9 is a view from above of another centering device.

FIG. 10 is an explanatory diagram of a conventional method for obtaining the center point of a circle.

[Explanation of symbols]

 1a-1e Centering device 4 Frustum-shaped elastic member (elastic member) 6a-6e Transparent plate 7 Needle 10 Small hole (insertion hole, needle insertion hole) 12 Circumferential line 14, 15 Mark point 20 Base paper (circular plane, Contact sheet) 21 yen 30 Tracing paper (contact sheet)

Claims (3)

[Scope of utility model registration request] 1. A transparent plate (6d, 6e) capable of seeing through a circle describing plane (20) on which a circle (21) for seeking a center is displayed, and a mark point (14, 15) as a place for marking. A centering device, characterized in that a plurality of circumferential lines (12) having the mark points (14, 15) as a common center are drawn on the transparent plates (6d, 6e). 2. The transparent plate (6a) is inserted through a transparent plate (6a) capable of seeing through a circular plane (20) on which a circle (21) for seeking a center is displayed, by inserting needle-like mark means for marking. ) Is formed with an insertion hole (10) that can be projected to the rear surface side, and a plurality of circumferential lines (12) centered on this insertion hole (10) are the transparent plate (6a).
A centering device characterized by being drawn in. 3. A transparent plate (6a-6c) capable of seeing through a circular plane (20) on which a circle (21) for seeking a center is displayed, and a needle drilled in this transparent plate (6a-6c). Insertion hole (10) and this needle insertion hole
In the needle insertion hole (10) against a plurality of circumferential lines (12) drawn on the transparent plate (6a-6c) with a common center point (10) and an elastic member (4). Having a needle (7) that is pushed in and protrudes to the back surface side of the transparent plate (6a-6c) and makes a needle mark on the contact sheet (20, 30) on the back surface side of the transparent plate (6a-6c). A centering device characterized by becoming.