JPS6257033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine for forming grooves (Ayasugi) on the inner surface of the body of a shamisen.

Because the inside of the shamisen body (hereinafter referred to as the workpiece) is spherical, aya cedar processing is a so-called three-dimensional process, and because the pitch of the grooves to be carved is so small, it is said to be impossible only by hand carving or using an NC machine. It is something that Hand engraving does not improve efficiency, and NC machines are expensive, resulting in high costs. Therefore, the present invention uses a mechanical copying method to simplify the copying device itself, so that it can correspond to a wide range of workpiece processing specifications, that is, it can be easily adjusted according to the vertical and horizontal curvature radius inside the workpiece. ,
As for the shape of the cedar, it is configured so that the vertical and horizontal pitches of the cedar, the groove angle, etc. can be easily adjusted and changed, making it a cedar processing machine that contributes to high efficiency processing and labor saving at an economical price. It was developed.

Hereinafter, the structure of the present invention will be described in detail based on an example. The workpiece 1 shown in FIGS. When machining, the chuck 2 is fixed to the chuck 2 with a jig so that it can be easily aligned with the machining center of the copying device, and the chuck 2 is integrally erected on a sliding table 3 that can slide left and right. The depth of the structure of the cypress 4 shown in FIG. 6 can be set by operating the handle 5 to move the chuck 2 in and out. A copying device consisting of a router head 7 and a copying head 6, which are arranged opposite to the mounting surface of the workpiece 1 of the chuck 2, is shown in FIG. 3 as a plan view and as shown in FIG. FIG. 5 shows a partial vertical sectional view of the router head 7. Its configuration consists of 8 slide plates.
Vertical shafts 9 and 10 are erected at predetermined intervals in the front and rear,
One end of a swing link 13 is rotatably connected to the lower surface of a flange 12 integral with a bearing housing 11 rotatably supported on a vertical shaft 9, and is rotatably engaged with the bearing housing 11. Holder bottom plate 14
and this flange 12 are integrally joined to a predetermined position of the bottom plate 14 in an arc-shaped elongated hole 15 centered on the vertical axis 9 with bolts 16 such that the opening degree can be adjusted freely, and a cutter 18 is attached to the holder 17. A router head 7 with its horizontal axis intersecting the vertical axis 9 is mounted so that it can move left and right in the direction of arrow A. On the other hand, a copying head 6 connected to the router head 7 at a predetermined interval has its horizontal axis intersecting the router head 7. A bearing housing 1 is disposed on the same plane as the horizontal axis of the invention, is arranged so as to intersect with the vertical axis 10, and is rotatably supported on the vertical axis 10 as shown in FIG.
The other end of the swing link 13 is rotatably joined to the lower surface of the flange 20 integral with the bearing housing 19 so as to constitute a parallel link mechanism, and a holder in which the stylus 21 is rotatably supported is attached to the upper part of the bearing housing 19. 22
is locked so that it can be moved left and right in the direction of arrow A'.
Next, as shown in FIG. 3, the center of rotation of the swing arm 23 with the horizontal axis as the center of rotation is on the plane in which the horizontal axes of the router head 7 and copying head 6 exist, and the vertical axes 9 of these , 10, the swing arm 23 is rotatably supported by bearings 25 fixed to the front and rear frames 24 of the machine frame, and the connecting rod connects the front and rear arms 26 of the swing arm 23. A slide plate 8 is secured to the slide plate 27 so as to be movable left and right in the direction of arrow B shown in FIG. The swing arm 23 is swung at a predetermined speed about pivot shafts 29, 29' by a hydraulic cylinder 28 shown in FIG. The teleplate 30 has a vertical axis 10 which is the center of swing of the copying head 6.
It is movably swung in the radial direction of a stepping board 31 having its center of rotation under the extension of , and is adjustable and latched to a mounting shaft 32 that is rotatably provided upright. In this embodiment, two types of templates 30 and 30' are mounted 180 degrees symmetrically on the mounting shaft 32.
By rotating 2 by 180 degrees, the twilled cedar pattern can be changed immediately. The stepping board 31 is driven by a suitable drive device and controlled by a microcomputer.
The swing link 1 is rotated by the tensile force of the spring 33 that is secured to the bearing housing 11 on the router head side.
3, the stylus 21 is pressed against the template 30 through The cutter 18 is
The router head 7 is fixed to the holder 17 by adjusting the distance to the cutting edge to be equal to this r. The swing radius R (the radius of curvature of the longitudinal section of the workpiece 1) is determined by aligning the slide plate 8 with the connecting rod 27 of the swing arm 23 so that it has a set radius R in the elongated hole 34, and aligns it with the axis of the rotation shafts 29, 29'. It is set by adjusting the movement perpendicularly in the direction of the left and right arrows B and fixing with the bolt 35.

To explain the processing operation in detail based on the above configuration, the swing arm 23 swings clockwise around the rotation shafts 29, 29' at a predetermined speed by pushing out the rod of the hydraulic cylinder 28, that is, the cutter 18 swings clockwise at a predetermined speed. While rotating, at a predetermined cut (groove depth), the inside of the workpiece 1 is moved from bottom to top with a swing radius R in a twill pattern while swinging around a vertical axis 9 with a swing radius r. A single piece of cedar is processed, and at the same time as the process is completed, the stylus 21 is released from the template 30 by operating the quick return lever 36, and then the swing arm 23 is swung counterclockwise by retracting the rod of the fluid pressure cylinder 28. The quick return lever 36 is released after the swing is completed, but during this time the template 3
Since the stylus 21 is rotated by an amount corresponding to a predetermined pitch with a predetermined swing radius r around the step axis 37, the stylus 21 is pressed against the template 30 after the step is completed at the same time as the quick return lever 36 is released. Then, the cycle operation of the next cedar machining is started, and in this way, the cypress machining is completed automatically one after another.
When changing the groove angle of the Aya cedar 4, move the holder bottom plate 14 against the flange 12 to which the swinging link 13 on the router head side is connected.
If the long hole 15 of 4 is rotated by a predetermined angle θ and locked, the groove shape shown in the cross-sectional view of the partial groove machining in FIG. 9 will be replaced with the groove shape with the groove angle shown in FIG. It is also possible to process twilled cedar with a groove shape like this.

In this way, all machining can be performed automatically and labor-savingly by simply mounting workpiece 1 on chuck 2 without using an expensive NC machine, and it is also possible to immediately respond to the machining specifications of workpiece 1 within a predetermined range. Therefore, it can be provided at an economical price as a twill cedar processing machine with capabilities comparable to NC machines.

[Brief explanation of the drawing]

Fig. 1 is a front view of a twill cedar processing machine according to the present invention;
Fig. 2 is a plan view of Fig. 1, Fig. 3 is a plan view of the copying device, Fig. 4 is a partially expanded vertical sectional view of the copying head, Fig. 5 is a partially longitudinal sectional view of the router head,
Figure 6 is a front view of the workpiece in the process of machining twill cedar, Figure 7 is a right side view of Figure 6, and Figure 8 is A- of Figure 6.
A' cross-sectional end view, FIG. 9 shows a cross-sectional view of a partial groove machining when the horizontal axis of the cutter is twisted by θ about the vertical axis. In the figure, 1 is the workpiece, 2 is the chuck, 3 is the sliding table, 4 is the twill cedar, 5 is the handle, 6 is the profiling head,
7 is a router head, 8 is a slide plate, 9 is a vertical shaft, 10 is a vertical shaft, 11 is a bearing housing, 12
is a flange, 13 is a swing link, 14 is a holder bottom plate, 15 is an elongated hole, 16 is a bolt, 17 is a holder, 18 is a cutter, 19 is a bearing housing,
20 is a flange, 21 is a stylus, 22 is a holder, 23 is a swing arm, 24 is a frame,
25 is a bearing, 26 is an arm, 27 is a connecting rod, 28
29 is a fluid pressure cylinder, 29 is a rotating shaft, 30 is a template, 31 is a stepping board, 32 is a mounting shaft, 33 is a spring, 34 is an elongated hole, 35 is a bolt, 36
37 is the quick return lever, and 37 is the walking axis.

Claims (1)

[Claims] 1 Connect the profiling head and router head so that they can swing freely around vertical axes vertically set up at predetermined intervals on a slide plate, so that their respective horizontal axes intersect with their respective vertical axes on the same plane. A slide plate is movably locked to a swing arm which is arranged so that the opening degree can be adjusted freely and whose rotation center is on this horizontal axis, and a template is placed on a stepping board whose rotation center is under the extension of the vertical axis on the copying head side. The stylus of the head is pressed against the stylus of the head according to the template, and the cutter of the router head of the copying device is slidably connected to the cutter of the router head of the copying device, which is made up of a stylus of the head that follows the template and is freely adjustable. A shamisen cedar processing machine that is characterized by being installed opposite to a stopped chuck.