JPS5921799B2 - scaling ruler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an enlargement/reduction ruler for doubling or halving figures, characters, and the like.

When scaling figures and characters using a proportional compass or scale, it is not only time consuming but also requires special drawing techniques.

For this reason, enlargement and reduction rulers have already been proposed, which allow the writing instrument to move proportionally to the movement of the needle when the needle is moved to follow the original drawing, making it possible to draw enlarged or reduced figures easily and efficiently. ing.

Conventional rulers use a pantograph mechanism and have a structure in which a combination of links provides proportional movement to the copying needle and writing instrument.

However, since the pantograph mechanism is composed of a complex combination of links and pivoted connections, the overall shape becomes large, which is inconvenient for drawing work, and it also has the drawbacks of poor durability and poor precision.

This invention was made in view of the above-mentioned drawbacks, and the two sliders attached to the guide member slide the guide member in the longitudinal direction and move in a 2:1 proportional relationship. It is an object of the present invention to provide a scaling ruler that can easily perform 2:1 scaling with high accuracy.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 3, the guide member 1 is a long rod-shaped straight line,
An example is shown in which two sliders 2 and 3 attached to this guide member 1 move in the same direction with respect to the fixed rotating shaft 4 in a 2:1 proportional relationship.

The guide member 1 is formed using an aluminum profile with an appropriate cross-sectional shape, and a vice 6 for fixing it to the table 5 is provided at the lower end of a rotating shaft 4 attached to one end, as shown in FIG. It is arranged on the table 5 so as to be rotatable in a plane about the rotating shaft 4.

This guide member 1 has wheels 7 attached to the lower surface of the other end thereof to roll on a table 5 so that the guide member 1 can rotate smoothly.

The two sliders 2 and 3 described above are attached to the outside of the guide member 1 without any play, and are each slidable in the longitudinal direction of the guide member 1.

At the bottom of both sliders 2 and 3, there is a mounting part 8 for a copying needle or a writing instrument.
0 mounting side can be selected.

Inside the guide member 1, the amount of movement of both sliders 2 and 3 is linked in a 2:1 proportional relationship, and the arrangement interval of both sliders 2 and 3 and the positional relationship of both sliders 2 and 3 from the rotation axis 4 are also the same. A moving means 11 is incorporated for moving at a ratio of .

The interlocking means 11 shown in FIG. 3 uses a wire and a pulley.
Slider 3, which is located further away, will move exactly twice as much as slider 2, which is closer to .

The interlocking means 11 uses a wire 12 that interlocks the movement of both sliders 2 and 3 in the direction toward the rotation shaft 4, and a wire 13 that interlocks the movement of the sliders 2 and 3 in the direction away from the rotation shaft 4.

The former wire 12 is attached to the guide member 1 at a position close to the rotating shaft 4 at one end, and a pulley 14 of the slider 2 is attached at the middle.
A pulley 15 attached to the rotating shaft 4 of the guide member 1, and a pulley 16 attached to the other end of the guide member 1 are wound in order, and the other end is fixed to the slider 3.

One end of the latter wire 13 is fixed to the slider 3, the middle is sequentially wound around pulleys 17 and 18 at both ends of the guide member and the pulley 19 of the slider 2, and the other end is connected to the other end of the guide member 1 via a spring 20. is connected to.

The former wire 12 is provided with an adjustment tool 21 at the end on the side where it is attached to the guide member 1, so that it is possible to correct positional errors between the sliders 2 and 3 due to expansion and contraction of the wire.

Due to the interlocking by the wires 2 and 3 as described above, both sliders 2 and 3 always move in the same direction at distances 11 and 12 from the rotating shaft 4 in a 2:1 relationship. By selecting the arrangement and winding of the wire, it is possible to configure both sliders 2 and 3 to move toward and away from each other in a two-to-one relationship. They may be combined to obtain the same effect.

Next, FIG. 4 shows an example in which the guide member 1 is bent at right angles and sliders 2 and 3 are attached to the straight parts on both sides. The distances 11 and 12 are 2:1, and they are moved in a 2:1 relationship by the same interlocking means as described above.

In this embodiment, the interlocking means must be bent along the guide member 1 to allow smooth movement of the wire at the bend.

Further, in FIG. 4, the mounting portions 8, 8 provided on both sliders 2 and 3 are made to protrude at a position farther away from the back surface so that the copying operation can be performed in an easy-to-see state.

In this case, the protrusion amounts L1 and L2 of both mounting parts 8 and 8 with respect to the longitudinal axis passing through the rotating shaft 4 of the guide member 1 are 2:1.
There is a relationship between

In addition, FIG. 5 shows the mounting part 8, in the same case as in FIG.
8 and the rotating shaft 4 are provided on the same line along the longitudinal direction of the guide member 1.

In addition, in the structure in which the guide member 1 is bent at right angles and sliders are attached to the straight parts on both sides, the orientation of the figure drawn in an enlarged or reduced state with respect to the original drawing is horizontal.

The enlarging/reducing ruler of the present invention has the above-mentioned structure, and the method of use thereof will be explained based on the embodiment shown in FIGS. 1 to 3.

First, in order to enlarge a figure, the guide member 1 is mounted on the table 5 with a vise 6, arranged so that it can rotate freely around the rotation axis 4, and the slider 2 near the rotation axis 4 is placed.
A copying needle 9 is attached to the attachment part 8 of the slider 3, and a writing instrument 10 is attached to the attachment part 8 of the slider 3, which is located away from the rotating shaft 4.

Note that the copying needle 9 may be formed by a switch or the like, and the writing instrument 10 may have a structure in which the pen is automatically moved up and down by a magnet electrically interlocked with the switch.

With the original drawing set directly under the slider 2 and the drafting paper positioned directly under the other slider 3, the copying needle 9 of the slider 2 is moved along the loop of the original drawing.

The copying needle 9 can be moved in a plane in all directions by sliding the slider 2 along the guide member 1 and rotating the guide member 1 about the rotating shaft 4.

When the slider 2 is moved, the slider 2 and the slider 3 interlocked via the interlocking means 11 will move in a proportional relationship of exactly twice that of the original drawing, and the writing instrument will draw a figure twice as large as the original drawing on the paper. become.

Next, to reduce the size, attach the writing instrument 10 to the slider 2 closer to the rotation axis 4 and the copying needle 9 to the slider 3 located away from the rotation axis 4, contrary to the case of enlargement, and use this slider 3 as the original drawing. When the slider 2 is moved along the drawing, the slider 2 to which the writing instrument is attached moves proportionally to 1/2, thereby drawing a figure scaled to 1/2.

As described above, according to the present invention, two sliders are attached to a guide member that rotates around one rotating shaft so as to be slidable in the longitudinal direction, and the amount of movement of both sliders is adjusted by a ratio of 2:1. Since it is linked to proportional relationships, it is possible to easily draw figures that are doubled or halved with extremely simple operations.

Further, since it can be constructed from a guide member, a slider attached to the guide member, and an interlocking means, the structure can be significantly simplified compared to a pantograph mechanism.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first example of the enlargement/reduction ruler according to the present invention, FIG. 2 is a front view showing the same in use, FIG. The figure is the same as above.
FIG. 5 is a plan view showing the third example. 1... Guide member, 2, 3... Slider, 4... Rotating shaft, 8... Mounting part, 9
...Copying needle, 10...Writing instrument, 11.
...Interlocking means, 12, 13...Wire,
14, 15, 16, 17, 1B, 19... Pulley.

Claims (1)

[Claims] 1. A sliding guide member that is equipped with one fixed rotating shaft and is rotatable around this rotating shaft, and that is attached to the guide member so as to be able to move linearly in the longitudinal direction, and that allows attachment and detachment of a copying needle or writing instrument. Two sliders are provided with attachment parts that can be attached freely, one of the two sliders is suspended from pulleys provided at both ends of the guide member, one end is attached to the guide member, and the other end is attached to the guide member. An enlargement/reduction ruler comprising an interlocking means for interlocking the movement amounts of both sliders in a 2:1 proportional relationship by means of a wire connected to the slider.