JPH0649916U - Full-scale reading device for reduced scale drawings - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a full-scale reading device for reduced-scale drawings, which is excellent in workability, requires no power supply, and has a simple structure and is inexpensive in order to read the dimensions in a reduced-scale drawing at the original size. [Structure] To measure the distance on the drawing, the thread wound on the reel is placed along the required position on the drawing, and the rotation of the reel that rotates according to the withdrawal amount of this thread is decelerated and transmitted to the rotating disk. Then, the rotation angle of the rotary disk is read by the original size display scale provided on the fixed scale disk that is in sliding contact with the circumference of the rotary disk.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for reading dimensions on a drawing, in particular, a dimension in a scaled drawing at an original size.

[0002]

[Prior art]

 When preparing for construction work, in order to read the required amount of wires, steel frames, etc. for wiring from the scale drawing for construction, the output of the rotary encoder has been conventionally input to a simple microprocessor. There is a device that calculates the original size from the relationship between the input data and the drawing scale that has been input in advance and displays it on a liquid crystal display or the like. However, such a device is rather expensive, and it is necessary to perform work while dragging the cord extending from the pencil type rotary encoder, which is troublesome and requires a power source.

[0003]

[The purpose of the device]

 The present invention has been made to eliminate the defects of the conventional full-size reading device of the drawings as described above, and has an excellent workability, does not require a power source, has a simple structure, and is therefore an inexpensive full-size reading device. The purpose is to provide.

[0004]

[Outline of the device]

 In order to achieve the above-mentioned object, a full-scale reading device of a scale drawing according to the present invention has the following configuration.

That is, in the distance measurement on the drawing, the yarn wound on the reel is placed along the required position on the drawing, and the rotation of the reel that rotates according to the withdrawal amount of this yarn is decelerated to rotate the rotating disk. The rotation angle of the rotary disc is read by a scale on the fixed scale provided on a fixed scale disc which is in contact with the circumference of the rotary disc.

[0006]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 (a) and 1 (b) are a side sectional view and a plan external view showing an embodiment of a full-scale reading device for a reduced scale drawing according to the present invention, respectively. In this figure, a nylon thread 3 is wound around a reel 2 having a radius R, which is rotatably attached to a proper position of an apparatus housing 1. The reel 2 is provided with a spiral guide groove on the outer periphery thereof so that the nylon thread 3 is not overlapped and wound, and both ends of the rotary shaft 4 of the reel 2 are supported by rubber elastic rings 5, 5. However, it is configured so that it will not rotate unless a certain torque is applied.

Further, a small gear 6 having a number of teeth Z ₁ is provided at a proper position on the shaft 4, and a large gear 7 having a number of teeth Z ₂ meshing with the small gear 6 is provided, and a rotary disk 8 coaxial with the large gear 7 is fixed to the large gear 7. To do. Further, a fixed scale disc 9 having a concentric axis is provided in the vicinity of the outer circumference of the rotary disc 8, and the scale to be engraved on the fixed scale disc 9 is as follows.

Now, assuming that the amount of withdrawal of the yarn 3 is 1, each rotation of the rotary disk 8 is θ = 1 / NR (where N = Z ₂ / Z ₁ ), so the scale of the drawing can be reduced to 1 / n. For example, the position corresponding to the central angle θ of the dial is set to be nl from the reference point. In the figure, 10 is a pin fixed to the end of the thread 3 to pierce the drawing in order to press the starting point of distance measurement, and 11 is the center of the rotary disk 8 to read the scale of the fixed scale disk 9. It is a scale that is fixed and rotates together. Furthermore, 12 on the drawing is a knob for rewinding the drawn-out thread 3.

As is apparent from the above description of the configuration, when the length of a required portion is to be read on a scale drawing, the operator pierces the pin 10 at the starting point and pulls out the thread 3 to obtain the required portion. By following the above path, it is possible to immediately read the original size from the scale of the fixed scale disc 9 corresponding to the rotation amount of the rotary disc 8.

Since the fixed scale disk 9 cannot be attached to the scale of the drawing as a fixed one, a plurality of metal disks 9 having scales corresponding to various scales may be used. For example, as shown in FIG. 2, this may be appropriately replaced and fixed by the magnet 13 embedded in the mounting portion of the housing 1.

Further, since this fixed scale disk can have scales corresponding to at least two kinds of scales on one surface thereof, it is possible to correspond to four kinds of scales on the front and back sides and the kinds of scales in the drawings are limited. Therefore, it is enough to use several disks for replacement.

The present invention is not limited to the above-described configuration. For example, when performing a building estimate that requires large-scale drawing reading, it is conceivable that the speed reduction mechanism using a conventional spur gear will lack the reduction ratio. As a mechanism suitable for such an application, for example, as shown in FIG. 3, an internal gear wheel 14 (the number of teeth Z ₃ ) fixed to the housing 1 is provided with a sun gear 15 (coaxial with the reel 2). A structure in which the number of teeth Z ₄ ) is provided and the planetary gears 16, 16, ... Are idled around them and are connected by an arm 17, and the arm 17 and the rotary disk 8 are integrated. Then, the deceleration ratio of the rotary disk 8 to the reel 2 is Z ₄ / (Z ₃ + Z ₄ ), which enables extremely large deceleration and makes it possible to match the axes of the whole body, so that the smart is achieved. And obtain a small device. If the reel 2 is provided with a coil spring 18 and a ratchet wheel 19 and a ratchet 20 for locking / unlocking the coil spring 18 and the ratchet wheel 20, it is convenient because the trouble of rewinding the yarn 3 can be omitted.

Further, the scale is not necessarily provided on the fixed disk 9 side, but is provided on the circumference of the rotary disk 8, and only the base mark that serves as a reference for distance measurement is provided on the fixed disk side. I don't mind. This is more convenient because the original size can be easily read while the holding posture of the apparatus is kept constant.

[0015]

[Effect of device]

 Since the present invention is constructed and functions as described above, it is extremely simple, and therefore not only the original size of the required portion can be read from the scale drawing with an inexpensive device, but also the operation is facilitated and the power supply is improved. Since there is no need to consider about the above, it is possible to improve the work efficiency by preparing a large number of devices according to the present invention, especially when a large number of people are used to estimate the required materials for a large building in a short time. Exerts a remarkable effect on the above.

[0016]

[Brief description of drawings]

1A and 1B are a side sectional view and a plan external view showing an embodiment of a drawing reading apparatus according to the present invention, respectively.

FIG. 2 is a partial cross-sectional view showing an embodiment of a fixed scale disc replacement mechanism.

FIG. 3 is a side sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 2 ... reel 3 ... thread 6, 7 and 14, 15, 16 ... deceleration means 8 ... rotating disk 9 ... fixed scale disk

Claims (3)

[Scope of utility model registration request] 1. A radius R in which the dimension measuring thread of the scale drawing is wound.
And a fixed disk having a concentric fixed scale disk adjacent to the circumference of the rotary disk and a rotary disk connected to the reel through a suitable speed reducing means having a speed reduction ratio of 1 / N. If the thread withdrawal amount is 1 and the scale of the drawing is 1 / n, the scale of the circumference is displayed as nl at the position corresponding to the rotation angle θ = l / NR of the rotating disk. A full-scale reading device for a reduced-scale drawing, wherein the full-scale reading device is adapted to directly read the full-scale size of the yarn from the drawn-out amount of the yarn along a required part of the drawing. 2. A utility model registration claim characterized in that a scale is provided on the circumference of the rotary disk and a distance reading reference mark is provided at a predetermined position on the circumference of the fixed scale disk. (1) A full-scale reading device of the scaled drawing described. 3. The fixed scale disc area is provided with a fixed scale disc having a scale corresponding to various scales, in which a rotary disc having a scale is detachably attached, and the fixed scale disc is provided according to the scale in the drawing. The full-scale reading device for a reduced scale drawing according to claim (1) or (2), characterized in that: