JPS5876299A - Compass - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compass having a needle leg and a working leg adjustable relative to the needle leg.

Typically, in a compass-based tracer, a predetermined dimension is set as the radius of a circle drawn around the needle leg, and this dimension or circle is transferred onto drawing paper. The process of measuring this dimension each time from a ruler is time consuming and requires the constant use of a reference ruler.

The object of the invention is to improve the operating characteristics of a compass of the type mentioned at the outset, making it more convenient to use. This problem is solved according to the invention by providing a measured value display device which digitally displays the length of the sliding distance of the tip of the working leg.

This eliminates the need for the aid of a reference ruler when working with the compass according to the invention. caused by the respective angular position of each compass leg,
The distance between the needle tip and the working tip, ie the respective compass radius, can be easily read off numerically on the measurement value display. What should be taken into consideration in this case is that the dimensional accuracy required for the compass in the case of pencil drawings is generally relatively small, and within a size of +0.2 mm this may have an adverse effect on the drawing accuracy. This is a point that can be changed without any change. Higher accuracy is not practically possible in conventional work with a compass because of the need for dimension detection from a ruler. Unlike this, the compass according to the invention can have higher accuracy. Particularly in the case of a compass in which an insert for an ink writing instrument or a precision drawing lead is used in the working leg, the structure according to the invention is optimal. The position of the drawing tip of the compass of the present invention does not change even during long working hours, which prevents the conventional working tip consisting of a thick pencil lead from wearing out over time and requiring repeated sharpening from time to time. This also eliminates the need for significant changes in the length of the actual working tip.

According to the means recited in claim 2, the measured value display section is located within the range closest to the line of sight of the person drawing the ζ compass, making it easy to read, and the means recited in claim 8 According to the publication, the measured value display is assigned to the compass leg on which the distance adjustment device for the needle tip is provided.

According to the means described in claim 6, the surface of the measured value display section is relatively large and therefore easy to read.

According to the means described in claim 4, the measurement display value always indicates the distance from the tip of the needle leg to the target position of the tip of the working leg, starting from the position of the tip of the needle leg. ＾It is no longer a structure that only shows. Rather, the present invention uses a zero set key to set the measurement value display to 6 zero''', i.e. return to zero, at any arbitrary position on the working leg or the tip of the working leg, and starting from that position, It is possible to adjust the tip of the section to the desired target value shown in the measured value display.

In practice, many drawings are drawn to a certain scale, either enlarged or reduced. In order to avoid simple but still time-consuming conversion operations in this case, the plotter is usually equipped with a special ruler with a measuring scale already converted to the desired enlarged or reduced scale. .

If a microelectronic device is used for the digital measurement value display, an embodiment as claimed in claim 6 is easily possible. By simple pressing of the proportional and change keys, the measured value display can be adjusted to the desired enlargement or reduction value. In this case, the measured value display does not indicate the actual distance of the working tip of the working leg from the respective zero position of the working tip, but rather indicates this distance with an adjusted reduction or expansion ratio. The result of multiplying by dividing is displayed.

According to the means recited in claim 6, the counting member and the measured value display member of the digital measuring device have an integral structure, thereby increasing the reliability of operation and, for example, moving the compass. This prevents damage from occurring at times.

According to the measures claimed in claim 7, a glass or sheet-like ruler is provided which has a line graduation which is relatively rough and which is particularly resistant to influences on inaccuracies caused by, for example, dirt.

The invention will now be explained with reference to the illustrated embodiment.

The compass shown in FIG. 1 comprises a needle leg 1 with a needle tip 2 and a working leg 3 with a working tip 4. The compass shown in FIG. The needle leg 1 and the working leg 3 are mounted in a compass head 5 so as to be able to pivot about respective axes extending perpendicular to the drawing plane. To the compass of the needle leg 1 and the working leg 3, a linear guide is provided between each end on the rad side, so that in any extended position each leg 1 and 3 is aligned with the compass head 5. A widening angle 6 of the same size is formed with respect to the central axis 7 of the fixedly connected operating knob 8.

In the example of FIG. 1, a quick-action double-legged compass is shown. A part 11 of the adjusting spindle 9 extending on one side of the adjusting gear 10 is provided with a thread, which thread is formed in the opposite direction to the thread of the other part 12 of the adjusting spindle 9. The two parts 11, 12 of the adjusting spindle 9 are fitted in corresponding spindle nuts (not shown) which are fastened to the legs 1 and 3.

This nut engagement is carried out by levers 13 assigned to the legs 1 and 3.
．． It can be removed by pressing 14. The adjusting gear 10 is guided in a slot 15 provided in the compass head 5 in such a way that it is rotatable but not slidable in the axial direction of the adjusting wheel 9.

Normally, the opening angle 6 of the legs 1, 3 is changed only by rotation of the adjusting gear 10 about the axis of the adjusting spindle 9;
That is, it can be enlarged or reduced.

By actuating the lever 13.14, the attachment of the legs 1.3 via the nuts to the adjusting spindle 9 is released, so that the opening angle can be adjusted by directly spreading the legs 1.3 by hand. 6 can be changed quickly even if it is a large value.

A measured value display device 16 that digitally displays the length of the sliding angle of the working tip 4 is disposed inside the compass head 5. 3 or within this plane of motion itself. Furthermore, a calculator (single-chip computer) is incorporated, and this calculator converts into a straight line representation using a trigonometric function near tn-7ir. Measurement-2, 1 The value display device 16 is provided with a zero/set key 18. Furthermore, the proportional scale change key 19 held by the compass head 5 is used to change the proportional scale indicated by numbers on the proportional display section 20. be able to.

The needle leg 21 of the beam compass shown in FIG. 2 is rigidly connected or can be connected to a rod 22. This needle leg 21 extends approximately at right angles to a rod 22 which carries a sheet-like or crystal ruler 40 which is detected by the measuring device. A working leg 23 is mounted on the rod 22 so as to be slidable in the longitudinal direction 24 of the rod. In order to facilitate fine longitudinal sliding movements, a knurled wheel 26 is provided on the guide part 25 of the working leg 23, the lower part of the circumference of which knurled wheel 26 in the direction of the arrow 27. It is pressed against the upper edge 28 of the rod 22 by a spring force acting perpendicularly to the longitudinal direction 24 of the rod.

The guide portion 25 has a measurement value display section 17 and a proportional display surface 20.
, a zero set key 18 , and a proportional scale change key 19 .

The compass head 5 of the compass shown in FIG. 6 is correspondingly related to the compass head 5 of the compass shown in FIG. However, the working leg 3 and the needle leg 1 are pivotally connected to the expansion legs 29, 30 and are supported pivotably about axes 31, 32 extending perpendicularly to the plane of the drawing; A cross bar 33 is rigidly connected to the needle leg 1 and extends at right angles (angle 34) to the longitudinal extension of the needle leg.

The working leg 3 is longitudinally slidably guided along a cross bar 33 and fixedly guided by a knurled-headed screw 35 in the working leg 3, so that the position relative to one central axis of the compass is fixed. Irrespective of the widening leg 29,30 at a widening angle 6, the parallelism between the working leg 3 and the needle leg 1 is always guaranteed.

Lower ends 36 of needle leg 1 and working leg 3 in FIG.
, 37, as is known, extends perpendicular to the plane of the drawing and is pivotable about a fixed axis 38, 39, which axis' is such that each lower end 36. It is formed by a screw so that it can be stopped in the pivot position. After the lower end 36, 37 has been pivoted or adjusted in this way, the zero set key 18 must be pressed again.

In the exemplary embodiment shown, the mode of operation of the measured value display device in question is not specified in detail, since incremental measuring devices have long been generally known, for example in the field of machine tool and tool manufacturing. This is because. Length or spacing measurements in this type of incremental measuring device are carried out by electronically or optically counting graduations placed on a glass or sheet-like ruler 40. If the measuring device has to measure and display the sliding distance between two parts, one of the two parts which can be slid relative to each other and the aforementioned glass or sheet-like ruler are connected and an electronic A digital counting device is coupled to the other member.

[Brief explanation of drawings]

The drawings show several embodiments of the invention, the first
The figure shows a two-legged compass as a quick-action compass equipped with a measuring value display device according to the invention, FIG. 2 shows a beam compass, and FIG. FIG. 2 is a diagram showing a type of compass that is housed in a parallel beam.

Claims (1)

[Claims] 1. In a compass having a needle leg and a working leg adjustable with respect to the needle leg, the working leg (
3; A compass characterized in that it is equipped with a measured value display device (16) that digitally displays the length of the sliding distance of the tip (4) of 23). 2. The measurement value display device (16) is connected to both legs of the compass.
3) A compass according to claim 1, which is arranged in a compass head (5) bearing a compass head (5). 6. The measured value display section (17) is connected to the compass legs (1, 2)
1; 3, 23) located in a plane extending parallel to the plane of motion or within the plane of motion itself.
Compass mentioned in section. 4. Press the zero set key (18) on the measured value display device (16).
). A compass according to claim 1, wherein the compass is provided with: 5. The measured value display unit (17) is provided with a proportional scale display unit (20), and the measured value display unit (16) is provided with a proportional and change key (1).
9) A compass according to claim 1, which is provided with: 6. The counting member of the counting device is arranged on the glass or sheet-like ruler 40) of the incremental counting device or on the needle leg (1; 21) or on a member fixedly connected to the needle leg; Compass according to claim 1, characterized in that the working leg (3; 23) is connected to the working leg (3; 23). Compass according to claim 1, characterized in that a glass or sheet-like ruler (40) of the incremental counting device is arranged on the sliding rod (22 or 33). 8. Compass lζ with compass legs guided parallel to each other, characterized in that a measured value display device (16) is arranged on the working leg (23).