JPS6334955Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotation operating device for a head division plate in a universal parallel ruler.

Conventionally, a head support is provided with a rotatable head shaft, an operating head is provided at the upper end of the head shaft, a scale support plate is provided at the lower end, and a protractor is provided in the middle of the head shaft. A flexible parallel ruler in which the rotation angle of the scale can be recognized by the minute scale on the dial and the index scale on the scale support plate, in which the degree dial is provided so as to be rotatable and fixable with respect to the head axis. , a device in which the base line of the minute scale can be freely changed is known, and the present invention relates to an improvement of the device for rotating the head portion of the dial.

In other words, the protractor on the universal parallel ruler was originally
It is fixed to the head part, and the rotation angle of the scale relative to it can be known from the indicator on the scale side, but in some drafting work, the reference position of the minute scale is converted by a predetermined angle from the previously set position. There are times when it is more convenient. In such a case, it may be possible to provide a second degree scale and index between the protractor and the head and rotate the protractor together with the scale, but this is not enough to rotate the scale. It is preferable to be able to rotate only the protractor to a predetermined conversion position while keeping the scale fixed. However, in order to rotate the protractor independently by hand, it is necessary to expose a part of the protractor to the head, but in this case, it is necessary to prevent dust and lint from getting caught. There are many problems such as dirt, structural problems with the scale rotating part, and appearance.
SUMMARY OF THE INVENTION An object of the present invention is therefore to provide a rotation operating device for a head graduation dial, which can be rotated independently from the outside of the head portion while the graduation dial is covered with a cover body.

The present invention will be explained in detail below with reference to the illustrated embodiment. In FIG. 1, 1 is a head portion of a universal parallel ruler, and 2 is a head support connected via a link 2a to a cursor board that moves along a vertical rail. The body rotatably supports the head shaft in the center. 3 is an operating head provided at the upper end of the head shaft;
4 is a scale mounting plate, and 5 is a cover body. Second
In the figure, reference numeral 6 denotes a scale support plate provided at the lower end of the head shaft, which is rotated by the rotation of the operating head 3 relative to the head support 2, and allows the scale attached to the scale mounting plate 4 to be placed on the drawing surface. It is designed to rotate at the top. Then, the cover body 5
is integrally fixed to the scale support plate 6, and is rotated together with the scale by the rotation operation of the operating head 3. 7 is a protractor located in the middle of the head shaft.
It is provided so as to be rotatable relative to the head support 2 and fixable at any rotational position. On the upper surface of the outer peripheral edge 7a of the protractor dial 7, a minute scale is provided at 180 degrees clockwise and counterclockwise with 0 degrees as the center. A scale is provided so that the relative rotation angle between the protractor 7 and the scale support plate 6 (ie, the scale) can be read through the indicator window 8. Further, an indexing board 7b is integrally provided on the lower edge of the outer periphery of the protractor 7, and engagement grooves are provided at predetermined intervals of 15° or 30° on the outer periphery of the indexing board 7b. The claw members provided on the scale support plate 6 facing each other are configured to be removably engaged with each other.

The above configuration has been known for a long time, and the present invention applies to all head dials of universal parallel rulers used when drawing by rotating the protractor 7 and converting the base line position. Such a rotation operating device can be applied.

That is, in FIG. 2, 9 is the scale support plate 6.
A rotatable member 10 having a convex side surface and consisting of a small diameter portion 10a and a large diameter portion 10b is rotatably provided on the support shaft fixed to the shaft through a bearing sleeve 11. The bearing sleeve 11 has a hole diameter larger than the shaft diameter of the support shaft 9 and is loosely fitted. The small diameter portion 10a of the protractor rotation member 10 is located opposite the outer circumferential surface 7c of the protractor plate 7, and the large diameter portion 10b projects outward from the through hole 12 of the cover body 5. There is.
In addition, a spring member 13 whose one end is fixed to the scale support plate 6 and whose other end is biased with spring elasticity is in contact with the lower end of the bearing sleeve 11, and the support shaft 9 is loosely attached to the bearing sleeve 11 via the spring member 13. The minute rotation member 10 fitted with the
At all times, the small diameter portion 10a is slightly separated from the outer circumferential surface 7c of the protractor 7, and the large diameter portion 10b is provided with spring elasticity in the direction of protruding outward from the cover body 5. Then, when a force is applied from the outside against the spring member 13 to the minute rotation member 10, the small diameter portion 10a
is in frictional contact with the outer circumferential surface 7c of the protractor board 7, and is configured to rotate as the protractor rotation member 10 rotates.

In addition, in FIG. 1, 14 is a baseline lever for removably fixing the head support 2 and the protractor plate 7 together, and 15 is a baseline lever for removably fixing the head support 2 and the scale support plate 6 together. The degree lever 16 for fixing is an indexing lever that allows the indexing plate 7b and the claw member that engages with the indexing plate 7b to be detachably attached.

To explain how the device of the present invention having the above-mentioned configuration is used, the protractor lever 15 is fixed, the protractor plate 7 is made freely rotatable, and the base position of the protractor plate 7 is moved by 12 degrees, for example. If so, the rotation member 1 is rotated by degrees based on the indicator scale on the scale support plate 6 side.
0 until the minute scale of the dial 7 moves by 12 degrees, and if the dial 7 is fixed to the head support 2 by the baseline lever 14, the baseline position of the scale rotation angle will be 12 degrees. This means that it is set to the rotated position. Therefore, it is sufficient to loosen the degree lever 15 and rotate the scale according to the newly set degree scale. During this rotation operation, since the minute rotation member 10 is separated from the degree board 7 by the spring member 13, there is no risk of receiving frictional resistance from the minute rotation member 10.

As mentioned above, conventionally, even if an attempt was made to convert the base line position of the minute scale by rotating only the protractor with the scale fixed, the protractor was covered with a cover surrounding the scale support plate for dust prevention and ease of operation. The structure was difficult to rotate independently because it was inside the body, but according to the device of the present invention, a part of the rotary member protrudes outward from the cover body located near the indicator window. Since the rotary operation of the protractor dial can be easily performed and the structure is simple, it is possible to provide a rotary operation device for the head portion dial by making a slight design change to the conventional device. , it has great practical benefits.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the device of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing the main part along the line - in FIG. 1. DESCRIPTION OF SYMBOLS 1: Head part, 2: Head support body, 5: Cover body, 6: Scale support plate, 7: Protractor board, 9: Support shaft, 10: Minute rotation member, 11: Bearing member, 1
3: Spring member.

Claims (1)

[Scope of utility model registration request] A head shaft is rotatably provided on the head support 2,
An operating head 3 is integrally provided at the upper end of the head shaft, and a scale support plate 6 is integrally provided at the lower end.
A protractor board 7 is rotatably provided in the middle of the head shaft,
In addition, the scale support plate 6 and the protractor board 7 are each independently fixed to the head support member 2, and the minutes of the protractor board 7 can be read from the index window 8 of the cover body 5 provided around the scale support plate 6. By reading the degree scale and the index scale on the scale support plate side, only the protractor board 7 can be rotated with the scale support plate 6 fixed to the head support member 2 to determine the base line position of the protractor board. In the convertible parallel ruler, a protractor 7 is placed on the scale support plate 6 located near the indicator window 8.
A rotary rotary member 10 that can come into contact with and separate from the outer circumference of the cover body 5 through a slight gap is rotatably provided, and a part of the rotary rotary member 10 is protruded outward from the cover body 5 for rotation operation. A rotation operating device for a head part of a graduation board in a universal parallel ruler, which is provided with a spring member 13 on the graduation rotation member 10 in a direction away from a graduation board 7.