JPH0318226Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention relates to the rotating original plate of an engraving machine, and more specifically, it is a method for drilling small holes with improved precision in the workpiece, which is the workpiece. The invention relates to a rotary original plate with scales that has been made possible.

[Conventional technology]

Generally, an engraving machine operates a long bar that forms one side of a quadrilateral pantograph mechanism, and the stylus attached to the holder of this long bar is freely rotated according to the size and shape of a circular original plate fixed on a copy table. By rotating the spindle attached to the scale bar of the pantograph mechanism, hole processing such as drilling or cutting is performed in the object to be cut, such as plastic or light metal fixed on the work table.

In the pantograph mechanism, the spindle moves in a direction opposite to the direction of movement of the stylus, and the amount of movement is determined by a preset scale factor. This scale ratio can be set in the range of 1:1 to 1:50, so that the size of the processed area is reduced to the size and shape of the circular original plate. However, most of the work involves scaling at a 1:2 ratio.

The circular original plate is made of metal or synthetic resin and is formed into a disk shape, and each original plate has concentric grooves formed at regular intervals (from a minimum interval of 1 mm to 2 mm, 4 mm, etc.). . In addition to the above-mentioned ordinary circular original plate, there is also a caliper-type circular original plate in which a vernier caliper is rotatably attached to a disc-shaped substrate.

[Problem that the invention attempts to solve]

The above conventional technology has the following problems.

For a normal circular original plate, it is limited to making grooves with a minimum interval of 1 mm, so when holes are drilled at a pantograph scale ratio of 1:2, the diameter of the workpiece to be cut is 1 mm. It was impossible to drill holes smaller than the spacing, and dimensional accuracy below the decimal point could not be accurately expected. In addition, even if the spindle bit is sharpened to adjust the width in consideration of the above-mentioned work limit, it only consumes time and labor, and the processing accuracy cannot be expected as much as expected. Furthermore, if a flaw occurs in the groove, the condition is transmitted to the stylus and affects the machining location, so careful work and handling are required and the work is complicated.

When a caliper-type circular original plate is used, it takes time and effort to move the guide pin center of the caliper every time the dimensions are adjusted, and it also involves the trouble of delicately manipulating the fine scale of the caliper, which leads to the problem of poor work efficiency. Ta.

In particular, when manufacturing and processing a prototype, frequent dimensional adjustments are required, so the above-mentioned ordinary circular original plate or caliper-type circular original plate has a problem of poor workability.

This invention solves the above problems, allows quick adjustment of any dimension, allows the same dimension to be set repeatedly, and has a scale that allows for highly accurate hole processing such as drilling and cutting. The purpose is to provide a rotating original plate.

[Means for solving problems]

In this invention, as a means to solve the above-mentioned problems, a rotary plate is rotatably attached to a spindle attached to a board, and a reference scale is formed on the upper surface of the rotary plate with the spindle as a reference point. It is constructed by forming fine scales that subdivide the length between each reference scale in a certain direction from the position of each reference scale.

[Effect]

According to the rotary plate with a scale of this invention, any dimensional position on the rotary plate can be set by directly reading from the reference scale or fine scale, and the rotary plate can freely move forward and backward around the spindle attached to the board. It can be rotated.

〔Example〕

An embodiment of this invention will be described based on the drawings. Figure 1 of the drawings is a partially omitted plan view showing a rotary original plate with scales, Figure 2 is a schematic explanatory diagram showing the main parts of the engraving machine, and Figure 3 is a diagram showing how dimensions are set on the rotary plate using the guide pin of the stylus. FIG.

As shown in FIG. 1, the rotary original plate A with scales is composed of a substrate B and a rotary plate C rotatably attached to the substrate B.

The board B is formed into a circular shape using a synthetic resin such as acrylic, and has mounting portions 1 (one on one side in FIG. (Only one of them is shown in the figure) is provided protruding from each other. On the periphery of this substrate B, increments are formed at every 10° and every 45° to form a protractor 2.

Further, a hole is formed in the center of the substrate B, into which a support shaft 3 (described later) is fitted and fixed. In addition, on the top surface of this substrate, although not shown, several thinly carved depressions are formed in concentric circles.
Frictional resistance with the rotating plate C is reduced.

On the other hand, the rotary plate C is made of metal such as steel or brass and is formed into a substantially fan shape. A support shaft 3 having a hole and a ball bearing is attached to the base end side of the rotary plate C, and is fitted into the hole of the substrate B and fixed, so that the rotary plate C can be freely rotated in forward and reverse directions. It is being assembled. As shown in Fig. 1, the tip side of the rotary plate C is
The length is such that it is located in front of the periphery of the substrate B.

On the upper surface of the rotary plate C, a reference scale 4 with a bottomed hole is formed in a straight line up to a maximum length of 170 mm at intervals of 1 mm with the center position of the support shaft 3 as the reference point 7. There is. Furthermore, the length between each reference scale 4 is subdivided, and the scale with the length below the decimal point in units of 1 mm is defined as the fine scale 5, which is in a certain direction from the position of each reference scale 4 (in Fig. 1, above the spiral arc). It is formed on a reading line 6 that divides an opening angle range of 20 degrees upward. The above reading line 6 is the base point 7 and the rotary plate C
It is formed across the tip side of the reference scale 4.
The numerical value (0.1 to 0.9) of each reading line 6 is clearly indicated on the extension of each reading line 6 (at the tip side end of the rotary plate C), with the value 0 being 0. In addition, regarding the fine scale 5 with a reference scale of 30 mm or less, in the range of an opening angle of 20°, the density is high and it is difficult to manufacture. I am trying to machine the holes. The position of the hole machining is formed on the reading line 6 which divides the opening angle range of 100 degrees as described above. Hole machining for the above reference scale 4 and fine scale 5 requires a hole bottom diameter of 0.4φ, a hole diameter of 0.7φ,
The depth is 0.6mm.

Furthermore, an acute-angled protrusion 8 is formed on the periphery of the distal end of the rotary plate C, and is aligned with the appropriate position of the protractor 2 on the substrate B, so that the rotation angle of the rotary plate C can be recognized. The protrusion 8 is formed on the periphery of the reference scale 4 and each reading line 6 in the extending direction. (Reference scale position = 0°, 0.1mm = 2°, 0.2mm = 4°, 0.3mm
= 6°, 0.4mm = 8°, 0.5mm = 11°, 0.6mm = 14°, 0.7mm
= 16°, 0.8mm = 18°, and 0.9mm = 20°).

Next, the rotary original plate A with scales configured as above
A case will be described in which a hole is formed in a workpiece using engraving machine D.

As shown in FIG. 2, the engraving machine D has a stylus 1 attached to a long bar 10 of a pantograph mechanism 9.
The tip guide pin 12 of No. 1 is brought into contact with the position of an appropriate reference scale 4 or fine scale 5 on the rotary plate C of the rotary original plate A with scales fixed to the copy table 13. In the above state, when the stylus 11 is moved to rotate the rotary plate C, the spindle 15 attached to the scale bar 14 of the pantograph mechanism 9 moves in a direction opposite to the direction of movement of the stylus 11, which is set in advance. Spindle 15 at the scale
Hole processing such as drilling or cutting is performed on a workpiece 17 fixed to a work table 16 provided below.

Specifically, the usage (calculation method) of the rotary original plate A with scales when drilling or cutting out the workpiece 17 will be explained using numerical examples.

I○ When drilling a hole of 50.4φ in the workpiece (pantograph scale ratio 1:2, bite thickness 2
mm) 50.4 (hole diameter) - 2 (bit size) = 48.4 (rotation speed scale position) Therefore, the guide pin 12 position of the stylus 11 is in contact with 48.4 of the fine scale 5, and the stylus 11
The rotating plate 6 may be rotated at the same time. (Indicated by I○ in Figure 3) B○ If the pantograph scale ratio is 1:4 with the settings of A○ above, 50.4-2 = 48.4 (pantograph) = 193.6÷2 (radius) = 96.8 (scale position of rotating plate) ) Therefore, the position of the guide pin 12 of the stylus 11 abuts on the fine scale 5 at 96.8, causing the rotary plate C to rotate. (Indicated by ○ in Figure 3) ○ When making a 50.4φ cutout on the workpiece (Pantograph scale ratio 1:2, bite thickness 2
mm) 50.4 (circle diameter) + 2 (bit thickness) = 52.4 (scale position of rotating plate) Therefore, the guide pin 12 of the stylus 11 is brought into contact with 52.4 of the fine scale 5, and the stylus 11 is rotated together with the rotating plate C. let (Indicated by ○ in Figure 3) ○ If the pantograph scale ratio is 1:4 with the setting of ○ above, 50.4 + 2 = 52.4 × 4 (pantograph) = 209.6 ÷ 2
(radius)=104.8 (scale position of rotary plate) Therefore, the guide pin 12 position of the stylus 11 abuts on 104.8 of the fine scale 5 and rotates the rotary plate C. (Indicated by a circle in Fig. 3) When cutting the workpiece 17 into an arc shape,
That is, when rounding is performed, the rotary plate C may be moved to a predetermined angular position using the protrusion 8 of the rotary plate C and the protractor 2 of the substrate B. Furthermore, it is of course possible to manufacture a conventional circular original plate by using the rotary original plate A with a scale of this invention.

[Effect of idea]

Since this invention is constructed as described above, it has the following effects.

Even if dimensional accuracy below the decimal point of 1 mm is required for hole machining of a workpiece, the work can be done quickly and accurately because the reference scale or fine scale on the rotary plate can be directly read.

Since a single rotary master plate with scales can be used with high precision to meet any size requirement, there is no need to prepare many types unlike conventional circular master plates.

Unlike conventional caliper-type circular original plates, where the dimensions are set by moving the scale each time the hole drilling dimensions change, it is only necessary to set the reference scale or fine scale formed on the rotary plate. ,
The same dimensions can be repeatedly obtained with high accuracy without any dimensional errors.

Since it does not take much time to set the dimensions, including the production of a prototype, there is no need for cumbersome operations and the workability is good.

[Brief explanation of drawings]

The drawings relate to an embodiment of this invention; Fig. 1 is a partially omitted plan view showing a rotating original plate with scales, Fig. 2 is a schematic explanatory drawing showing the main parts of the engraving machine, and Fig. 3 is a guide for the stylus. FIG. 3 is an explanatory diagram showing a state in which dimensions are set on a rotary plate with pins. A...Rotating original plate with scale, B...Substrate, C...
Rotating plate, 3... Support shaft, 4... Reference scale, 5... Fine scale, 7... Base point.

Claims (1)

[Scope of utility model registration request] A rotary plate is rotatably attached to a support shaft attached to a board, and a reference scale is formed on the upper surface of the rotor plate with the support shaft as the base point, and fine scales for subdividing the length between each reference scale are formed on the upper surface of the rotary plate. A rotary original plate with scales, characterized in that it is formed in a fixed direction from the position of a reference scale.