JPH08155906A - Cutter head for precutting - Google Patents

Abstract

PURPOSE: To provide a cutter head for precutting which is free from deflection and is capable of performing heavy cutting with high precision. CONSTITUTION: A fixed bearing cylinder 7 and a drive motor 12 which moves in an axial direction are arranged on a common installation base 3. A rotary cylinder 8 is held in a freely rotating manner on the bearing cylinder 7, then a large dia. cutter is installed at the tip of the rotary cylinder 8, and a small dia. cutter 16 is mounted on the rotary shaft 13 of the drive motor 12. Both rotary cylinder 8 and rotary shaft 13 are connected to each other by allowing for a tolerance by a movement in an axial direction. In addition, a means B to manipulate an axial direction movement is provided on the drive motor 12, and thereby the switching operation of the small dia. cutter 16 with the large dia. cutter 18 is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a cutter head for pre-cutting which is a structural material for wooden construction and which simultaneously cuts a groove and a large insertion portion.

[0002]

2. Description of the Related Art A frame construction method is basically constructed by fitting a pillar material and a horizontal material with a mortise, but it has various joints due to the complexity of the floor plan. FIG. 3 shows a typical example of them, which is composed of the following components. That is, a is the first floor pillar b is the second floor pillar c is the girder
Reference numeral d denotes a second-order beam, in which a dovetail groove e and a large insertion portion f are formed in the barrel c. The dovetail groove e and the large insertion portion f are efficient when processed at the same time, and the cutting head proposed in Japanese Utility Model Publication No. 1-44643 is conventionally used.

When performing groove processing with this cutting head, as shown in FIG. 2, the small diameter cutter 3 is placed inside the large diameter cutter 30.
1 is immersed and set, and when performing large insertion processing, a small-diameter cutter is projected outside the large-diameter cutter, and therefore a drive motor is not required for each cutter,
In addition, it has a structural feature such that the cutting stroke can be shortened because it is compact.

[0004]

By the way, in the conventional construction, the small diameter cutter 31 and the large diameter cutter 30 are provided at the tip of the drive motor 32, and both are relatively moved in the axial direction to perform the retracting operation. However, it is inevitable that the head structure including those holding mechanisms protrudes in a cantilever manner. For this reason, there is a disadvantage that the rotational balance of the cutter is deteriorated to cause shake. Further, in the mortise cutting process, the above-mentioned adverse effects are prominent due to heavy cutting, and there is a problem that the processing accuracy is deteriorated.

The present invention has been made by paying attention to the above-mentioned problems of the prior art, and by devising the holding structure of the cutter, it is possible to perform heavy cutting with high accuracy without precession for precut processing. Is intended to provide a cutter head for.

[0006]

In order to achieve the above object, the cutter head according to the present invention is constructed as follows. That is, the gist is that a fixed bearing cylinder and a drive motor that moves in the axial direction are provided on a common mounting base, and a large diameter cutter is attached to the rotary cylinder held by the bearing cylinder and the rotary shaft of the drive motor. A small-diameter cutter is rotatably attached to each of them, and the rotary cylinder and the rotary shaft are connected to each other by allowing only the axial movement, and further, the common mounting base and the drive motor are axially moved and moved. There is a means.

In addition to the above requirements, the second aspect of the cutter head according to the present invention sets the large diameter cutter and the small diameter cutter at the cutting position and the retracted position by linking the axial movement control means with the mounting base. What is done is summarized.

[0008]

By operating the moving operation means, the drive motor can be moved in the axial direction, and the small-diameter cutter can be projected and retracted with respect to the large-diameter cutter. By driving the drive motor, the small diameter cutter on the rotary shaft can be rotated. In addition, the rotation is transmitted to the large diameter cutter by the rotary cylinder, and both cutters can be rotationally driven at the same time. During this rotation, a fixed bearing cylinder provided on the mounting base holds the rotary cylinder. Therefore, the shake of the cutter can be suppressed.

The large-diameter cutter and the small-diameter cutter are held by a common mounting base, and are simultaneously set to the cutting position and the retracted position by the movement control means. When both cutters are in the cutting position, different types of mortise processing can be performed by performing the above-mentioned retracting operation of the cutters.

[0010]

EXAMPLE An example of a cutter head for precutting according to the present invention will be described below. FIG. 1 is a partially longitudinal front view showing the structure, and reference numeral 1 is an elevating base 2 which is vertically controlled to move up and down by elevating means (not shown).
Is a horizontal slide guide 3 disposed on the upper surface of the elevating base 1. A mounting base A disposed on the slide guide 2 is a lateral movement control means linked to the mounting base 3. This movement control means A is a mounting base 3. The passive nut 4 on the side, the feed screw shaft 5 screwed to the passive nut 4, and the servo motor 6 that rotationally drives the feed screw shaft 5.

Reference numeral 7 denotes a bearing cylinder provided on one side (left side in the drawing) of the mounting base 3, reference numeral 8 denotes a rotary cylinder provided inside the bearing cylinder 7 by a bearing 9, and reference numeral 10 denotes a horizontal direction provided at a central portion of the mounting base 3. The slide guide 11 is a motor base 12 arranged on the slide guide 10. The drive motor 13 is mounted on the motor base 11. The rotation shaft of the drive motor 12 is inserted into the rotary cylinder 8. To project.

A key 15 is provided axially in the middle of the rotary shaft 13, and a key 15 is provided in the rotary cylinder 8 in the axial direction. The rotary cylinder 8 and the rotary cylinder 8 are linked with each other while permitting only axial movement. 16 is a small-diameter cutter attached to the tip of the rotary shaft 13 by a bolt 17. 18 is a large-diameter cutter attached to the tip of the rotary cylinder 8. The small-diameter cutter 16 and the large-diameter cutter 18 are arranged concentrically.

Reference numeral B denotes a moving operation means for setting the axial position of the small diameter cutter 16 with respect to the large diameter cutter 18, which is an axial pneumatic cylinder 20 fixed to the mounting base 3 and its piston rod linked to the motor base 11. 21 and the projection amount adjusting means (not shown) of the piston rod 21. In the above, when the piston rod 21 contracts, the small-diameter cutter 16 sinks into the large-diameter cutter 18, and when the piston rod 21 extends, the small-diameter cutter 16 projects outside the large-diameter cutter 18.

The construction of the cutter head according to the embodiment is as described above. When the tenon processing is on standby, the movement control means A moves the mounting base 3 to the outside (to the right in the figure), and the small diameter cutter 16 and The large diameter cutter 18 is retracted from the processed material W. In this retracted state, the small-diameter cutter 16 is set to the retracted position by the moving operation means B.

Next, the case of performing the tenon processing shown in FIG. 2 will be described. This processing ends the cutting processing in two steps, and requires large insertion processing and dovetail groove processing in order. First, in order to perform the large insertion processing, the movement control means A
The mounting base 3 is controlled and driven in the forward direction (to the left in the drawing) to set the large-diameter cutter 18 to the required cutting position for the workpiece W. After setting, the cutter is rotated to move the elevating base 1 in the descending direction (downward in the figure).

When the large insertion process is completed as described above, the elevating base 1 is returned to the ascending end and the moving operation means B is operated at that position to move the small diameter cutter 16 to the protruding position shown by the phantom line in the figure. Set. And after setting,
The elevating base 1 is controlled and moved in the descending direction. The cutting depth due to the lowering is determined based on the upper surface position of the processed material W, and is halfway in the height direction. The required mortise processing can be performed by the above cutting processing.

In the embodiment of the present invention, the movement control means A is constituted by the servo motor 6 in order to cope with various width dimensions of the work material W, but if the position is adjusted by the switching type stopper means, the pneumatic pressure is adjusted. A cylinder can be used. In the configuration of the embodiment, the small diameter cutter and the large diameter cutter have the same number of rotations, so that the peripheral speed of the cutting edge is different. To correct this, it is easy to adjust the speed of the drive motor.

[0018]

As described above, the cutter head for pre-cutting according to the present invention has a large-diameter cutter fixed and held on a mounting base separate from the drive motor side. Therefore, there is an excellent effect that high-precision cutting processing can be stably performed without vibration.

[Brief description of drawings]

FIG. 1 is a partially longitudinal front view showing an embodiment of a cutter head according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a joint portion in the frame construction method.

FIG. 3 is an explanatory view showing the structure of a conventional cutter head.

[Explanation of symbols]

 A movement control means B movement operation means 3 mounting base 7 bearing cylinder 8 rotary cylinder 11 motor base 12 drive motor 13 rotary shaft 14 key 15 key groove 16 small diameter cutter 18 large diameter cutter

Claims (2)

[Claims] 1. A common mounting base for a machining head for arranging a large-diameter cutter and a small-diameter cutter concentrically and adjusting the positions of these cutters in the direction of the rotation axis to perform different types of mortise cutting on a workpiece. A fixed bearing cylinder and a drive motor that moves in the axial direction are arranged in the bearing cylinder, and a large diameter cutter is rotatably attached to the rotary cylinder held by the bearing cylinder, and a small diameter cutter is rotatably attached to the rotary shaft of the drive motor. A precut, characterized in that the rotary cylinder and the rotary shaft are connected to each other while allowing only the axial movement, and further an axial movement moving operation means is provided between the common mounting base and the drive motor. Cutter head for processing. 2. A cutter for precut processing according to claim 1, wherein the mounting base is associated with axial movement control means to set the large diameter cutter and the small diameter cutter at the cutting position and the retracted position. head.