KR0116869Y1 - Piercing machine - Google Patents

Abstract

The perforator is capable of rotating within a range of a predetermined rotational angle θ about the base frame 1 fixed on the workpiece 21 and its center axis 4 on the base frame 1. To the disk 3, the drill stand 22 installed at right angles to the disk 3, the electric drill 31 mounted on the drill stand 22 so as to be movable in parallel thereto, and the electric drill 31. The one end is supported and rotates around its own shaft center and the cutter 24 is mounted on the other end, and the drilling shaft 51 and the disc 3 have a cylindrical outer circumferential surface 51a. Locking device 30 for freely attaching and detaching to the disc 3 and the cylindrical outer peripheral surface 51a of the drilling rotary shaft 51 is freely rotated about its own shaft center along the drilling rotary shaft 51. It consists of the support part 50 which supports sliding freely. By supporting the drilling rotation shaft 51 with the support part 50, deflection and damage of the cutter 24 can be prevented.

Description

boring machine

1 is a front view of a conventional perforator, and a sectional view of the locking device.

2 is a perspective view of an essential part including the locking device of the drilling machine of FIG.

3 is a plan view of the main part of the drilling machine of FIG.

Figure 4 is a perspective view of one embodiment of a perforator of the present invention.

5 is a plan view of the perforator of FIG. 4, and is a partial cross-sectional view of the locking device.

6 is a longitudinal sectional view of the locking device of the perforator of FIG.

7 is a side view of an essential part including the locking device of the punching machine of FIG. 4 and the support of the drilling shaft, and is a cross-sectional view of the locking device.

8A is a longitudinal sectional view of the locking device when the locking device of the punching machine of FIG. 4 is in a relaxed state.

8B is a longitudinal sectional view of the locking device when the locking device of the punching machine of FIG. 4 is in an intermediate state between the relaxed and tightened states.

8C is a longitudinal sectional view of the locking device when the locking device of the punching machine of FIG. 4 is in the tightened state.

* Description of the symbols for the main parts of the drawings *

1: base frame 3: disc

5: shaft 8: flat washer

11: crank pin 12: crank lever

21: Workpiece 22: Drill Stand

30: locking device 31: electric drill

50: support part 51: drilling rotation shaft

52: round ball 53: bush

70: first bevel block 80: second bevel block

The present invention relates to a perforator most suitable for machining grooved steel or H-shaped steel, in particular, after fixing the perforator on the upper part of the workpiece such as the shaped steel, and setting a cutter such as a drill at the machining position of the workpiece The present invention relates to a perforator for fixing a drill stand to a perforator to perforate a workpiece with this cutter.

In the drilling machine of the type which can set the drilling position by rotating the electric drill about the axis of rotation of the drill stand after being installed on the upper part of the workpiece, the drilling axis of the electric drill is also rotated about the axis of rotation of the drill stand. Since it is impossible to install a support for freely guiding the drilling shaft freely and freely sliding in the axial direction on the base of the upper part of the workpiece in which the electric drill is installed upright, until now, only the upper end can support the drilling shaft. It is only that what can be developed.

However, when a long stroke is required on the drilling shaft or when a heavy cutting is required with a large diameter cutter, the tip of the cutter is deflected due to the large resistance received from the workpiece. There is concern. In addition, since the surface of the workpiece is hardened by the oxide film, vibration occurs in the cutter at the start of punching, whereby the cutter is easily broken or large punching deflection occurs.

In addition, conventionally, an electric drill is installed in a drill stand with a magnet, and the drill stand is adsorbed to a workpiece by a magnet so that the workpiece can be punched, and the positioning and improvement of the workpiece are improved. Perforator has been proposed. However, this type of perforator has a problem that the magnetic adsorption force by the electromagnet depends on the thickness of the workpiece. In particular, when the thickness of the workpiece is relatively thin, the self-adsorption force is weakened, the fixing force of the positioning is lowered, and the torque when drilling the workpiece such as the grooved steel to be processed increases, so that the drill stand is used to Side slipping occurs.

The inventors of the present invention do not produce side slips due to the increase in torque due to cutting resistance even when the workpiece is not self-adsorbed, as disclosed in the practical application 61-96609. A magnetless punching machine has been proposed that can be precisely fixed at a predetermined position to realize a high-precision drilling work.

The conventional magnetless perforator will be described with reference to FIGS. 1 to 3.

In FIG. 1, the punching machine 100 is provided with the clamp part 102 which clamps the to-be-processed object 101, and is installed in the upper part of this clamp part 102, and is rotatable about the center axis of itself. The drill stand 103 is provided, the slider 104 which slides freely up and down with respect to the drill stand 103, and the electric drill 105 fixed to this slider 104 are comprised.

A cutter (not shown) for drilling the workpiece 101 is provided at the lower end of the drilling rotary shaft of the electric drill 105. Holes of various shapes can be drilled in the workpiece 101 by replacing the cutter. Moreover, by adjusting the vertical position of the slider 104, the positioning of the cutter provided in the electric drill 105 can be carried out up and down. In addition, the punching position of the workpiece 101 by the electric drill 105 can be changed by rotating about the center of rotation of the disk 113, which is described later, for the drilling rotation axis of the drill stand 103.

Referring to FIG. 1, the clamp unit 102 includes a base frame for installing and supporting a pair of left and right clamp plates 106a and 106b and a drill stand 103 for fixing the perforator 100 to the workpiece 101. 108 is provided.

The clamp plates 106a and 106b are screwed to the axle shaft 107, and are separated from each other by rotating the axle shaft 107, so that the clamp plate can be clamped when approached. The clamp portion 102 and the axle shaft 107 including the 106a and 106b constitute a vise type clamp portion.

As shown in FIG. 2, the U-shaped base frame 108 in cross section is composed of a horizontal plate-shaped main body 108c and a pair of side wall portions 108a and 108b having upper ends fixed to both ends thereof. The upper portions of the clamp plates 106a and 106b are accommodated in the space 108d defined by the frame 108.

It has a pair of guide rods 109a and 109b which are parallel to each other and installed back and forth on both side wall portions 108a and 108b, and clamp plates 106a and 106b are inserted into these guide rods 109a and 109b freely.

As shown in FIG. 1, the lower end shaft 107 penetrates the left side wall part 108a freely about the axis center by the left end part. Then, a pair of stop collars 110a and 110b for fitting the left side wall portion 108a on the left end portion are temporarily installed in series. In addition, the right end of the minor yarn axis 107 is axially supported by the right side wall portion 108b. The minor threaded shaft 107 is formed in the right hand threaded portion 107a by the right half and the left hand threaded portion 107b by the left half, and the right side (base of the lamp plate 106b) is formed in the right hand threaded portion 107a. The base 106c is screwed together, and the base 106d of the left clamp plate 106a is screwed into the left-hand screw portion 107b. Thus, the axle thread shaft 107 and the clamp plates 106a and 106b are screwed together. ) Is composed of a vise, so the clamping lever 111 attached to the stop color 110a rotates the axle shaft 107 forward in FIG. 1 and right in FIG. 2 so that both clamp plates 106a, 106b) can be approached according to the guide rods 109a and 109b, and the clamping plate 106a and 106b can be separated from each other by rotating the axle shaft 107 to the clamp lever 111 in reverse. .

On the other hand, the pin 112 fixed to the main body portion 108c of the base frame 108 at right angles is installed through the support shaft of the disk 113 so that the disk 113 can be rotated about its center of rotation. At the same time, the lock nut 115 is screwed to the distal end of the pin 112 to hold the disk 113 through the flat washer 114 so that the disk 113 does not fall off the base frame 108. The disk 113 has an arc-shaped hole extending in the circumferential circumferential portion 113a in a range of the rotation angle θ that is unfolded about the central axis of the pin 112 as shown in FIG. 2. 116 is formed.

As shown in FIG. 1, the threaded portion 118 of the fixing lever 117 screwed to the main body portion 108c of the base frame 108 is fitted into the long hole 116 so as to be movable. For this reason, the disk 113 can be rotated about the support shaft within the range of rotation angle (theta).

After the disk 113 rotates to a predetermined position, the fixing lever 117 is rotated in the clamping direction, and the flange portion 119 of the screw portion 118 positioned at the center of rotation is placed on the upper surface of the disk 113. And the disk 113 is clamped to the body portion 108c of the base frame 108 by the screw portion 118. In this way, the disc 113 is set at a predetermined position on the base frame 108.

As shown in FIG. 2, a pair of stoppers 120a and 120b are installed in the long hole 123 provided in the base frame 108 and rotated in the left or right direction of the disk 113 to form the long hole. 123 is slidable. These stoppers 120a and 120b are fixed to the long hole 123 by screws 121a and 121b, and the protrusions 122 are formed to protrude radially outward from the outer periphery of the disk 113 by clamping. ) And the disk 113 can be set at a predetermined position by fixing the stopper 120a or 120b.

A puncher 100 without a magnet is prepared as follows to punch the workpiece 101.

First, the perforator 100 is placed on the workpiece 101 and moved in the longitudinal direction of the workpiece 101, if necessary, to be installed at a predetermined position thereon.

Next, the punch mark formed at the intersection of the ruled lines formed on the workpiece 101, which is the center of the hole for drilling, by rotating the disk 113 about its center of rotation and drilling the tip of the pilot pin of the electric drill 105. To match.

In this state, the disk 113 is clamped to the main body 108c of the base frame 108 by the clamp lever 117, and the protrusions 122 of the disk 113 are stopped by the stoppers 120a and 120b. Fixed in position, and the cutter coincides with the puncturing position of the workpiece 101. Subsequently, when the minor axis shaft 107 is rotated in the right direction in FIG. 2 by the clamp lever 111, both clamp plates 106a and 106b approach each other along the guide rods 109a and 109b, and their opposite inner wall surfaces. The perforator is fixed to the workpiece 101 by clamping the outer wall surfaces 101a and 101b of the workpiece 101 with 106e and 106f.

Then, the electric drill 105 is driven to lower the cutter so that the cutter aligns its center with the center of the hole to be drilled and drills the workpiece 101 in accordance with the punch mark on the intersection point of the ruled line. In this case, since both clamp plates 106a and 106b clamp the outer wall portions 101a and 101b of the workpiece 101, the rotational torque centering on the cutter is applied to the disk 113 by cutting resistance during drilling. Even if it does, the punching machine 100 does not side slip on the workpiece 101.

However, in the above-mentioned known magnetless perforator 100, the locking device having the fixed lever 117 having the threaded portion 118 is designed to rotate horizontally so that the perforator is portable. Requires too large a required area. Incidentally, as shown in FIG. 3, the threaded portion 118 of the fixing lever 117 at the clamp position D with respect to the base frame 108 of the disk 113 has a rotational center A of the disk 113 and In the case of heavy cutting, it is located at the clamp position D of the disk 113 in the case of heavy cutting because it is located at a position far from the straight line C connecting the center point (punching position) B of the cutter installed on the drilling rotary shaft of the electric drill 105. Reaction force from the electric drill 105 against the disk 113 generates a large moment, the disk 113 rises in the base frame 108, or the drill stand causes resonance, thereby weakening the fabric process density or cutting the cutter. It may cause damage.

The object of the present invention is to support a part other than the upper end of the drilling shaft which is rotated and lifted by the electric drill, even though the electric drill is rotatable around the disk, whereby the workpiece by the center deflection of the cutter Another object of the present invention is to provide a punching machine that can prevent a drilling error or breakage of a cutter.

It is also an object of the present invention to ensure that the clamp position to the base frame of the disc is always on a straight line connecting the center of rotation of the disc and the center of the cutter installed on the drilling axis, no matter what the rotational position of the disc is. It is to provide a perforator which can prevent the injuries and resonance of the drill stand, improve the fabrication process and prevent the breakage of the cutter.

In order to achieve the above object, a perforator according to the present invention comprises a base frame fixed on a work piece and a disc rotatably installed within a range of a predetermined rotation axis about its own central axis on the base frame, A drill stand installed at a right angle, an electric drill mounted on the drill stand so as to be movable in parallel with the drill stand, and a drill for holding one end thereof, rotating about its own axis, and mounting a cutter at the other end A rotating shaft, a locking device for freely attaching and detaching the disk to the base frame, and a support portion formed on the disk and rotating freely around the center of its own shaft and supporting the sliding shaft freely along the drilling shaft.

The locking device is configured such that the clamp position for tightening the disk to the base frame is located on a straight line connecting the center of rotation of the disk and the center of the cutter installed on the drilling shaft.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 4 to 7 and 8a and 8c.

As shown in FIG. 6, the base frame 1 is composed of a main body portion 1a on a horizontal plate and a pair of side wall portions 1b and 1c having upper ends fixed to left and right ends thereof, as in the case of a conventional punching machine. Of the pair of clamp plates 2a, 2b for clamping the workpieces 21, such as the section steel, in the space 1d defined by the portions 1a, 1b, 1c in cross section. The upper end is housed. The bonding separation between these clamp plates 2a and 2b is performed by rotating the clamp lever 111 (FIG. 4), but the structure and operation for performing this bonding separation are the perforator shown in FIGS. Since it is the same as that of (100), only the clamp lever 111 and the stop collar 110a are shown in FIG. 4, and illustration or description of other elements is omitted.

As shown in FIG. 5, the disk 3 is placed on the upper surface 1f of the main body portion 1a of the base frame 1 with the rotation axis 4 to the rotation center A as in the conventional case. It is hypothesized to be rotatable. Further, as shown in FIGS. 4 and 6, the drill stand 22 is installed in a state where the lower end is fixed by suitable fixing means such as bolts or welding at right angles to the upper surface 3a of the disk 3. It is. In addition, as shown in FIG. 4, the electric drill 31 is temporarily installed on the drill stand 22 so that the drilling rotary shaft 51 is parallel to the rotary shaft 4 of the disk 3. Hanging down from The upper end of the drilling rotating shaft 51 is fixed to the electric drill 31 and is rotated by the electric drill 31. The drilling cutter 24 is provided in the lower end of the drilling rotating shaft 51. These structures are also the same as the conventional one. The electric drill 31 and the drilling rotation shaft 51 are driven by a motor 60.

As shown in FIG. 5, the elongate plate-shaped support part 50 protrudes radially outward from the side periphery of the disc 3, and the circular hole 52 is formed in the front-end | tip. A bush 53 in which a circular hole 53a having an inner diameter equal to the outer diameter of the drilling rotation shaft 51 is formed is fitted in this circular hole 52, and is supported by a fixing screw 54 (FIG. 4). It is fixed to 50. The drilling rotation shaft 51 is inserted into the circular hole 53a, and slides the circular hole 53a up and down and rotates on the cylindrical outer peripheral surface 51a. In this way, the drilling shaft 51 does not displace even when heavy cutting is performed by the cutter 24 even when the drilling shaft 51 is longer to maintain the upper portion and a portion below it. It is held parallel to the axis of rotation 4 of the disk 3. Therefore, the drilling process density can be increased without causing the cutter tip 25 of the cutter 24 to shake during drilling, and damage to the cutter 24 can be prevented.

Although the support part 50 is integrally formed with the disk 3 in FIG. 5, the protrusion part 55 protrudes radially outward integrally in the side circumference of the disk 3, as shown in FIG. May be rigidly fixed to the free end of the head) by fixing means such as a screw 56 (only one is shown).

Next, the locking device 30 of the present invention will be described.

As shown in FIG. 5, the locking device 30 has a clamp position D of the disk 3 to the base frame 1, so that the center of rotation A of the disk 3 and the drilling of the electric drill 31 are performed. It is comprised so that it may be located on the straight line C which connects the center B of the cutter 24 provided in the lower end of the rotating shaft 51. As shown in FIG.

As shown in FIG. 6, the locking device 30 has a vertical shaft 5 which is free to move up and down with respect to the disk 3 when it is in a relaxed state, and the lower end 5a of the vertical shaft 5 is It penetrates through the disk 3 and is inserted into an arc-shaped hole 6 formed in the main body portion 1a of the base frame 1. A bolt (7) fitted with a flat washer (8) constituting a disc clamp means so that the vertical shaft (5) abuts against the lower surface (1 g) of the main body portion (1a) so that the vertical shaft (5) does not separate upward from the long hole (6). ) Is screwed into the lower end 5a of the vertical shaft 5. As shown in FIG. 5, the long hole 6 is an arc-shaped disc having an angle of rotation θ which is unfolded about the center of rotation A of the disc 3 corresponding to the center of rotation of the drill stand 22. It is formed in the edge part 1h by the side of the electric drill 31 of (3). Therefore, the disk 3 can rotate with respect to the base frame 1 within the range of this angle (theta).

The locking device 30 has a first inclined block 70 and a second inclined block 80. A second inclined block 80 having a right lower inclined surface 20 formed in the middle of the upper surface is provided on the upper surface 3a of the disk 3. In addition, the first inclined block 70 has an inclined surface 70a formed by the left side rise of the lower left side thereof, and an upper end portion of the vertical shaft 5 in the hole 70b formed from the lower surface of the first inclined block 70. (5f) is inserted and fixed. The first inclined block 70 is provided on the second inclined block 80 in a state in which the inclined surface 70a is slid bonded to the inclined surface 20 of the second inclined block 80.

The projection receiving part 9 in which the horizontal hole 9a was formed is formed in the upper surface left side of the 2nd inclination block 80, The nut 10 is inserted and fixed in this horizontal hole 9a. The crank pin 11 is inserted into the nut 10 so as to be rotatable but floating in the axial direction, and a male screw 11a formed on the outer circumferential surface of the crank pin 11 is formed of the first inclined block 70. It is screwed into the horizontal female screw 70c formed in the upper portion.

A short shaft portion 11b is formed at the left end of the crank pin 11, and the crank lever 12 is rotatably connected to the left end by a spline coupling 11c (FIG. 5). Further, the left end of the shaft portion 11b is a polygon such as a hexagon or an octagon, for example, a hole complementary to the polygon is formed in the right end of the crank lever 12, and the shaft portion ( The left end of 11b) may be inserted. The washer 14 is arrange | positioned between the right end surface of the shaft part 11b, and the left end surface of the protrusion receiving part 9 (FIG. 6).

As shown in FIG. 5, between the bottom surface and the head 11e of the rod 11d extending to the left from the shaft portion 11b in the cylindrical hole 12b formed in the rotation shaft 12a of the crank lever 12. The crank lever 12 is pulled to the left to detach the shaft crank 11b from the shaft part 11b, and the circumferential position is changed and connected to the shaft part 11b to lock the crank lever 12 again. The rotation angle for operating the device 30 can be adjusted.

The crank pin 11, which is screwed to the female screw 70c of the first inclined block 70 with the male screw 11a according to the rotational direction of the crank lever 12, is moved to the right or left of the axial direction in the X direction. Move with respect to the first slope block 70.

When the crank pin 11 is in the right direction, the second inclination block 80 is also in the right direction, and the inclined surface 20 slides on the inclined surface 70a, and the first inclined block 70 is moved with respect to the second inclined block 80. The locking device 30 is tightened as described later by moving upward in the Y direction. On the contrary, when the crank pin 11 is left, the second inclined block 80 is also left, and the first inclined block 70 slides in the opposite direction than when the inclined surface 20 is right on the inclined surface 70a. Move the inward and downward direction in the Y direction with respect to the second inclined block 80 to execute the relaxation action to the locking device (30).

As shown in FIG. 6, an elongated hole 80a in the X direction is formed in the center of the second inclined block 80 through which the vertical shaft 5 is inserted, and the first inclined block 70 is formed. Space between the left wall surface portion of the long hole 80a and the left wall surface portion of the shaft 5 is sufficient to allow the second slope block 80 to move toward the first slope block 70 until it is lifted to the maximum. To form.

Here, the projection receiving part 9, the nut 10, the crank pin 11, the male screw 11a, the crank lever 12, the washer 14, the first inclined block 70, the female screw 70c, The second inclined block 80 constitutes a disk clamp means and includes a protrusion receiving portion 9, a nut 10, a crank pin 11, an external thread 11a, a crank lever 12, a washer 14, The female screw 70c constitutes a moving means.

By the way, the center of the vertical shaft 5 is the clamp position D for tightening the disk 3 to the base frame 1 because of the configuration of the locking device 30 described above. As shown in FIG. 5, the clamp position D is disposed so as to be positioned on a straight line C connecting the center of rotation A of the disk 3 and the center B of the blade tip of the cutter 24. As shown in FIG. .

Next, the operation of the embodiment of the drilling machine of the present invention will be described with reference to FIGS. 4, 6, 7 and 8a to 8c.

First, the gap between the clamp plates 2a and 2b is made larger than the width of the workpiece 21, the locking device 30 is in a relaxed state, and the perforator is placed near the predetermined position to be drilled on the workpiece 21. By operating the lever 111, the workpiece 21 is lightly clamped by the clamp plates 2a and 2b. When the locking device 30 is in this state, as shown in FIG. 8A, the second inclined block 80 is in the leftmost position, and the first inclined block 70 is lowered most so that the flat washer 8 It is separated from the lower surface 1g of the base frame 1, and the disk 3 is set in the state which can be freely rotated with respect to the base frame 1. As shown in FIG.

Subsequently, the electric drill 31 is rotated about the rotation axis 4 of the disc 3, and the position of the punching machine on the workpiece 21 is finely adjusted so that the center of the blade tip 25 of the cutter 24 can be adjusted. (B) is matched to the punch mark on the intersection of the ruled line where the hole on the workpiece 21 is to be formed, and the lock lever 111 is operated again to securely preserve the workpiece 21 with the clamp plates 2a and 2b. . Then, when the crank lever 12 is rotated to the right in FIG. 4, the crank pin 11 causes the second inclined block 80 to be in the relaxed state of the locking device 30 shown in FIG. 8A. As shown by the arrow X1 at the left end position, the inclined surface 20 of the second inclined block 80 advances in the right direction with respect to the inclined surface 70a of the first inclined block 70, The first inclination block 70 is raised as indicated by arrow Y1.

When the crank lever 12 is rotated again in the right direction in FIG. 4, the second inclined block 80 fills the gap between the left wall portion of the long hole 80a and the left wall portion of the vertical shaft 5. Through the intermediate state shown in FIG. 8B, the tightening state shown in FIG. 8C is obtained. In this tightening state, the second inclined block 80 reaches the uppermost end, and the inclined surface 20 is at the uppermost end of the inclined surface 70a of the first inclined block 70. The first inclined block 70 is further raised, the shaft 5 is further raised, and the flat washer 8 is pressed against the bottom surface 1g of the base frame 1 so that the bottom surface of the second inclined block 80 is The upper surface 3a of the disk 3 is pressed. As a result, the disc 3 is turned on a straight line C at which the clamping position D connects the base frame 1 to the center of rotation A of the disc 3 and the center B of the cutter 24. Is fixed in the state.

The drilling operation is executed after the locking device 30 is in the tightened state shown in FIG. 8C. During this drilling operation, the punching machine of the present invention has the following technical effects.

First, even when the drilling shaft 51 is long because the upper end portion thereof is supported by the electric drill 31 and the lower portion is supported by the support portion 50 provided on the disk 3, the drilling shaft 51 is also interrupted. Even when cutting is performed, the center deflection does not occur in the cutter 24.

Secondly, the clamping position D of the disc 3 to the base frame 1 of the locking device 30 connects the center of rotation A of the disc 3 with the center B of the cutter 24. Since the disk 3 is lifted up from the base frame 1 or the drill stand 22 does not cause resonance even during heavy cutting because it is on the straight line C. In addition, the perforator does not side slip on the workpiece 21 during drilling.

Third, the crank lever 12 of the locking device 30 can be placed in this narrow space, which is inconvenient to operate even though the locking device 30 is in a narrow space between the drill stand 22 and the electric drill 31. It can be arranged in a large space next to the drill stand 22 and the electric drill 31 without the need. And since this crank lever 12 is operated up and down, there is also an advantage that it does not require a large horizontal area unlike the case of a well-known perforator.

As a result, it is possible to prevent the breakage of the cutter while increasing the processing density in the punching machine of the present invention.

After the end of the drilling process, the operation of the electric drill 31 and the drilling rotation shaft 51 is stopped, and the crank lever 12 is rotated to the left in FIG. Clamping device 30 goes from the tightened state of FIG. 8C to the relaxed state of FIG. 8A through the intermediate state of FIG. 8B and the flat washer 8 is separated from the lower surface 1g of base frame 1, and the disk 3 Is opened in the base frame (1). If the next drilling position is determined only by rotating the electric drill 31 without moving the perforator on the workpiece 21, only the electric drill 31 is rotated to rotate the blade tip 27 of the cutter 24. The punch is performed by matching the new punch position. Then, the clamp levers 111 are operated to separate the clamp plates 2a and 2b from the workpiece 21 and to move the perforator to the next drilling position or to separate it from the workpiece 21.

In this embodiment, the locking device 30 employs a cam locking mechanism composed of a first inclined block 70, a second inclined block 80, a shaft 5 and a flat washer 8, but instead of a bolt And a nut screwed to it, and these may be fastened to a disc in the base frame.

The present invention is not limited to the above embodiment, and of course, it can be applied to various modifications as long as it falls within the technical scope of the present invention.

Claims (10)

A base frame 1 fixed on the workpiece 21, A disc 3 rotatably mounted on the base frame 1 within a range of a predetermined rotation angle θ around its own rotation center A; A drill stand 22 installed at right angles to the disk 3; An electric drill 31 installed to be movable to the drill stand 22 in parallel with the drill stand 22; One end is held by the electric drill 31 and rotated about its own shaft center, and the cutter 24 is mounted at the other end and the drilling shaft 51 has a cylindrical outer periphery 51a, A locking device 30 for freely attaching and detaching the disk 3 to the base frame 1; A support part 50 formed on the disk 3 and supporting the cylindrical outer circumferential surface 51a of the drilling rotation shaft 51 freely and freely sliding along the drilling rotation shaft 51 at its center. In the perforator provided, The locking device 30 is connected to the center of rotation A of the disc 3 and the center B of the cutter 24 fixed to the drilling rotation shaft 51 on the straight line C. And 3) a clamp position (D) for clamping the base frame (1). According to claim 1, wherein the support portion 50 is a plate-shaped portion sailed radially outward from the disk (3), the circular hole 52 formed in the drilling rotation shaft 51, and the circular hole 52 And a bush (53) which is fitted and which holds the drilling rotation shaft (51) rotatably and slidably in the axial direction. The base frame (1) is spread around the rotation center (A) of the disk (3) on the edge (1h) of the electric drill 31 side of the base frame (1). An arc-shaped slot 6 of rotation angle θ is formed, and the locking device 30 is a vertical shaft 5 penetrating the arc-shaped slot 6 and the disk 3 at the fastening position D. Perforator having a). 4. The base frame clamp means (8) according to claim 3, wherein the locking device (30) is installed at the lower end (5a) of the vertical shaft (5) and can be hooked or detached from the lower surface (1g) of the base frame (1). And the base frame clamping means 8 cooperate with the vertical shaft 5 to be pressed against the upper surface 3a of the disk 3 when the base frame clamping means 8 is engaged with the lower surface 1g of the base frame 1. The disk clamp means 9, 10, 11, 11a which are separated from the upper surface 3a of the disk 3 when the base frame clamp means 8 is separated from the lower surface 1g of the base frame 1; Perforator, characterized in that consisting of, 12, 14, 70, 80. 5. The disk clamping means according to claim 4, wherein the disk clamping means has an inclined surface (70a) on a lower surface and is fixed to the upper end (5f) of the shaft (5), the first inclined block (70) and A second inclined block 80 provided between the disc 3 and having an inclined surface 20 formed thereon to slidably engage the inclined surface 70a of the first inclined block 70, and the second inclined block 80 formed thereon; A movement of sliding the two inclined block 80 on the upper surface 3a of the disk 3 according to the inclined surfaces 70a and 20 of the first inclined block 70 and the second inclined block 80. Perforator characterized in that it consists of means (9, 10, 11, 11a, 12, 14, 70b). 6. The perforator according to claim 5, wherein the base frame clamp means is a flat washer (8) held at the lower end (5a) of the vertical shaft (5). The upper surface of the disk (3) according to claim 5, wherein said moving means moves said first inclined block (70) and said second inclined block (80) according to said inclined surfaces (70a, 20) of these inclined blocks. A crank pin 11 penetrating parallel to 3a) and rotatably installed in the second inclined block 80 but floating in the axial direction and having a male screw 11a formed on an outer circumferential surface thereof; And a female screw (70c) formed therein and screwed to the male screw (11a). 8. The perforator as claimed in claim 7, wherein the base frame clamp means is a flat washer (8) supported at the lower end (5a) of the vertical shaft (5). The perforator according to claim 7, wherein the moving means comprises a crank lever (12) installed at one end of the crank pin (11). 10. A perforator according to claim 9, wherein said base frame clamp means is a flat washer (8) supported at said lower end (5a) of said vertical shaft (5).