JPH031158Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention relates to a machine tool used for die engraving, etc.
In particular, it relates to the structure of a jig equipped with a rotation mechanism for performing curved surface machining on a workpiece.

BACKGROUND ART Conventionally, in the production of molding dies for molding operations such as casting and plastic molding, a method has been adopted in which the material is cut by so-called profiling, in which a master mold is slid with a contactor to operate a cutter.

Processing accuracy is reflected in the final product, so high-precision processing is required.

[Conventional technology]

The conventional technology will be explained below with reference to FIGS. 3 to 5.

Fig. 3a is a partially enlarged front view of the product, Fig. 3b is a side view of Fig. 4a, Fig. 4a is a side view showing an example of a processing method, Fig. 4b is a side view showing another processing method, Figure 5a is a front view of the jig with a rotating mechanism, and Figure 5b is a front view of the jig with a rotating mechanism.
Fig. 3 is a perspective view showing the method of winding the wire around the pulley.

Figures 3a and 3b are enlarged partial views of the type portion of a type wheel used in a type wheel type impact serial printer device.

In the figure, the case of type T is shown, but
For the purpose of improving printing quality, all of the typefaces 1 have a curved surface 1a with a concave center when viewed from the Y-axis direction in FIG.

Therefore, in the mold 2 for molding the above-mentioned product, the same portion has an oppositely convex curved surface 2a, as shown by the two-dot chain line.

There are methods to process the curved surface as shown in FIGS. 4a and 4b.

That is, as shown in figure a, there is a method in which the cutter 3 is moved in a curved line as shown by arrow B-C while the die 2 is fixed, and a method in which the cutter 3 is fixed and the cutter 3 is moved in a curved direction as shown in arrow B-C, as shown in figure b. There are two possible ways to rotate the holder as shown by arrow B-C.

Comparing the above two methods, the method shown in Figure A has the problem that the cut surface 2a has cutting scratches (cutter marks) caused by the cutter 3 and the finish is not smooth.

There is no such problem in the case shown in b of the same figure, and this processing method is superior.

Therefore, in the engraving of type 2 of type 1, the fourth
The method shown in Figure b is adopted.

In order to carry out the processing method shown in FIG. 4B, a jig 4 having a rotating mechanism as shown in FIGS. 5A and 5B is attached to the engraving machine.

That is, a stand 7 is attached to the table 5 of the engraving machine via a slide rail 6 so as to be able to reciprocate in the direction of the arrow DE.

A block 8 is provided on the table 7, and a main shaft 9 is rotatably provided on the block 8 via a bearing 10 in a direction orthogonal to the table 5, as shown in FIG.

On one side of the main shaft, on the right side in Figure b, there is a mold 11.
A fixing part 12 is provided for fixing the same, and a pulley 13 is provided on the left side in FIG.

A wire 14 is connected to the pulley 13 as shown in FIG.
is wound, and the wire 14 is indicated by arrows L and M.
It is pulled in the direction, and its both ends are fixed to a fixing part (not shown) provided on the table 5.

As shown in FIG. 3c, the wire 14 is tightly wound around the main shaft 9, indicated by a two-dot chain line, once or more through a pulley to prevent slipping.

Therefore, as shown in FIG. 5a, when the stand 7 moves on the table 5 in the direction of the arrow D, the pulley 13 rotates in the direction of the arrow F, and conversely, when the stand 7 moves in the direction of the arrow E, the pulley 13 rotates in the direction of the arrow E. rotates in the direction of arrow G.

At the same time, the fixed part 12 and the shape member 11 fixed to the fixed part 12 also rotate in the same manner.

On the other hand, the cutter 3 is provided perpendicularly to the table 5, and as shown in FIG.
Also, it is designed to be able to move freely on the same plane as indicated by arrow J-K.

Note that the cutter 3 is fixed in the vertical direction,
Contact with the shape material 11 during processing is performed by moving the table 5 in the direction of arrow H-I by a mechanism not shown.

Further, the cutter 3 and the shape material 11 are configured to move in opposite directions by a link mechanism (not shown), for example, when the cutter 3 moves in the direction of arrow D, the shape material 11 moves in the direction of arrow E.

The amount of movement can be adjusted using a link mechanism or the like.

When performing processing using the engraving mechanism equipped with the jig 4 having such a configuration, first the mold material 11 is fixed to the fixing part 12, and then the table 5 is moved a predetermined amount in the direction of arrow H to come into contact with the cutter 3. let

Thereafter, the cutter 3 is rotated, and the mother mold is slid by a contactor attached to the above-mentioned link mechanism (not shown) directly connected to the cutter 3.

Then, the cutter 3 carves the shape of the matrix into the rotatable mold material 11 at a predetermined reduction or enlargement ratio.

[Problem that the invention attempts to solve]

As explained above, the main shaft provided on the jig for rotating the shape material relies on a wire wound around one pulley at one end.

If there is a slip between the pulley and the wire, the movement that follows the shape of the mother die will be disrupted, leading to defective machining, which becomes an extremely important problem in machining. Therefore, in order to prevent this, the wire is wound so that it is fixed to the pulley with extremely strong force.

Since there is a deviation in the operating position of the wound wire 14 with respect to the main axis, in addition to the original rotational force, a rotational moment is also generated in the axial direction perpendicular to the longitudinal axis. This moment causes bending of the main shaft 9 in the directions of arrows N and O, as shown in FIG. 5c.

This torsion caused problems such as early wear of the main shaft and difficulty in smooth rotation of the main shaft.

[Means for solving problems]

The above problem is caused by the two pulleys 13 on the main shaft 9'.
13' are brought closer together, one pulley 13 is fixed,
The other pulley 13' is rotatably attached, and the two wires 14, 14' are wound in reverse around the respective pulleys 13, 13', and both ends pulled out in opposite directions are stretched and fixed. solved by.

[Effect]

That is, by providing two pulleys for the main shaft and winding the wire oppositely around each pulley, the bending due to the rotational moment that occurs in the case of one pulley can be bent by adding another pulley. This is counteracted by the opposite bending that occurs in the pulley.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a side view of a jig with a rotating mechanism according to the present invention, and FIG. 2 is a perspective view showing a method of winding a wire around a pulley.

In the figure, 4' is a jig, 9' is a main shaft, 10' is a bearing, 13' is a pulley, and 14' is a wire. Identical parts are designated by the same reference numerals throughout the figures.

As shown in FIG. 1, the rotating jig 4' according to the present invention has a pulley 13' arranged on the main shaft 9' in parallel with the pulley 13. As shown, the wires 14 and 14' are wound in opposite directions, and both ends pulled out in opposite directions are stretched and fixed, respectively.

In this case, one of the pulleys, for example, pulley 13', is rotatably attached to the main shaft via a bearing 10'.

This is because one pulley rotates the main shaft 9', and the other pulley only serves to correct the bending caused by the pulley in the opposite direction.

The operation will be explained with reference to FIG.

As mentioned above, the wire 14 pulled in the direction of the arrow LM is tightly wound around the main shaft 9' via the pulley 13 (not shown), and the unwinding direction from L to M is on the near side in the figure. Therefore, the main shaft 9' is bent as shown by arrows O and N.

On the other hand, wire 1 pulled in the direction of arrow L'-M'
4' is tightly wound around the main shaft 9' via a pulley 13' (not shown), and the unwinding direction from L' to M' is the forward side in the figure, so that the main shaft 9' bends as indicated by arrows O′ and N′ occur.

Therefore, the torsions cancel each other out, and there is no bending in the main shaft 9'.

In this embodiment, the unwinding intersection position of the wires 14, 14' is above the main shaft 9' in FIG.
This crossing position may be above or below, as long as the wire is unwound in a direction in which the generation of rotational moment depending on the winding direction is reversed.

[Effect of idea]

As explained above, by introducing the jig equipped with the rotating mechanism of the present invention into an engraving machine, the bending action of the main shaft of the jig that rotates the shape material is eliminated, and wear of the main shaft can be prevented. The rotation of the main shaft became smoother, and the slip phenomenon between the wire and the pulley was eliminated, making it possible to improve machining accuracy.

[Brief explanation of drawings]

Fig. 1 is a side view of a jig with a rotating mechanism according to the present invention, Fig. 2 is a perspective view showing a method of winding a wire around a pulley, Fig. 3a is a partially enlarged front view of the product,
Fig. 3b is a side view of Fig. 4a, Fig. 4a is a side view showing an example of the processing method, Fig. 4b is a side view showing another processing method, and Fig. 5a is a jig with a rotating mechanism. Front view of the tool,
FIG. 5b is a view in the direction of arrow A in FIG. 5a, and FIG. 5c is a perspective view showing a method of winding the wire around the pulley. In the diagram, 1 is typeface, 3 is a cutter, 4, 4'
is a jig, 5 is a table, 6 is a slide rail, 7
is the stand, 8 is the block, 9,9' is the main shaft, 10,1
0' is the bearing, 11 is the mold material, 12 is the fixed part,
13 and 13' are pulleys, and 14 and 14' are wires.

Claims (1)

[Claims for Utility Model Registration] A stand 7 is attached to the table 5 so as to be able to move back and forth in a straight line, and the table 7 is pivotally supported on the table 7 in a direction perpendicular to the direction of movement of the stand 7, and at one end there is a A fixing means is provided, and two pulleys 13, 13' are brought close to each other on opposite sides, one pulley 13 is fixed, and the other pulley 13' is rotatably attached to a main shaft 9'; , 13' are wound in opposite directions to each other,
The circuit is characterized by comprising wires 14 and 14' whose ends, which are pulled out in opposite directions, are stretched and fixed between fixed points provided on the table 5 in parallel to the moving direction of the table 7. Movement mechanism.