WO1997012721A1

WO1997012721A1 - Gas supply rotary joint for wood working

Info

Publication number: WO1997012721A1
Application number: PCT/JP1996/002652
Authority: WO
Inventors: Norio Ogura
Original assignee: Kanefusa Corporation
Priority date: 1995-10-03
Filing date: 1996-09-13
Publication date: 1997-04-10
Also published as: JPH0999405A; JP2895426B2

Abstract

A mechanism for interrupting the supply of a gas when a tool inserted in a tool fixing bore of a tool grip is about to come off. The mechanism is provided in a through bore opened at its one end in an outer circumferential portion of a rotary shaft of a rotary joint, and at the other end in an inner portion of the tool fixing bore of the tool grip.

Description

Specification

Gas supply Π Π1 Woodworking rotary joint

【Technical field】

The present invention relates to a rotary tool with a shank such as a drill end mill used for woodworking and similar processing, and a rotary tool having a hole inside the tool for supplying and jetting gas such as air from a cutting edge. This is related to woodworking rotary joints for supplying steel.

[Background Art]

Conventionally, as this type of rotary joint, for example, there is one disclosed in Japanese Utility Model Laid-Open Publication No. 6-53103. The rotary joint disclosed in this publication discloses two types, a rotary joint 51 shown in FIG. 8 and a rotary joint 71 shown in FIG. 9. The rotary joint 51 includes a rotary shaft 52 and a housing 6 3. The rotary shaft 52 is formed with a tool gripper 56 integrally formed on the distal end of a shaft portion 53 of a predetermined length and a screw shaft mounted on the main shaft 50 of the woodworking machine on the base side. A part 54 is formed, and a nut 55 for preventing loosening is screwed to the screw shaft part 5. Also, a tool mounting hole 57 is formed in the tool gripper 56 so as to allow the shank 68 a of the rotary tool 68 to be inserted along the center line C of the rotary shaft 52. An ftl screw portion 58 is screwed around the outer periphery of 56 at a predetermined interval toward the tool mounting hole 57, and a tightening bolt 59 for tightening and fixing the rotary tool 68 is screwed into the female screw portion 58. Has been done.

Further, a through hole 60 is opened at a depth end of the tool mounting hole 57. The through hole 60 is a vertical hole 61 having a predetermined diameter and a predetermined length along the center line C from the depth end of the tool mounting hole 57 and a shaft portion 5 3 extending from the depth end of the vertical hole 61. And a horizontal hole 62 penetrating in the diametrical direction. A housing 63 is provided on the outer periphery of the shaft portion 53 of the rotating shaft 52 thus formed.

The housing 63 is formed, for example, in a circular shape having substantially the same diameter as the tool gripping portion 56 and a predetermined thickness, and a fitting recess 64 into which the bearing 65 is fitted at both ends. The end bearing shield type bearing 65 is fitted through a collar in a state where it is fitted to the shaft portion 53, and the rotary shaft 52 is provided rotatably with respect to the housing 63. An air chamber 66 is formed between 52 and the housing 63, and The housing 63 is provided with a pushing 67 connected to an air supply source. A rotating tool (woodwork drill) 68 is attached to the tool gripper 56 of the rotating joint 51 thus formed. The rotary tool 68 includes a shank portion 68 a, a flute portion 68 b, and a cutting edge portion 68 c, and the rotary tool 68 communicates with the through hole 60 along its axis to release air. A small hole 69 is supplied, and the small hole 69 is bifurcated at the cutting edge portion 68c to form a jet hole 69a penetrating the cutting edge portion 68c. . The shank portion 68 a of the rotary tool 68 formed as described above is inserted into the tool mounting hole 57, and is tightened and fixed by the tightening bolt 59 while the inserted end thereof is in contact with the depth end. In this state, the pore 69 communicates with the through hole 60.

The rotary joint 51 provided in this manner is attached to the main shaft 50 via its screw shaft portion 54, and the pushing 67 of the housing 63 is connected to an air supply source by a supply pipe or the like. By rotating 50, rotation is given to the rotary tool 68 to perform perforation, and high-pressure air from an air supply source is supplied from the air chamber 66 to the pores 69 through the through holes 60, It is provided so that chips are ejected from the ejection holes 69 a to the blade tip 68 c and chips are discharged from the perforations.

Next, a rotary joint 71 shown in FIG. 9 is formed by separately forming a rotary shaft 72 and a tool gripper 78. One end of the rotary shaft 72 is a screw shaft portion 7 3 screwed to the main shaft 50. And a hexagonal spanner hooking portion 74 formed integrally therewith, and a tool holding tool 7 having a threaded portion 76 on the inside diameter along the center line C of the rotating shaft 72 on the other end side. At the depth end of the mounting hole 75, a short vertical hole 77a along the center line C and the outer periphery of the rotary shaft 72 orthogonal to the vertical hole 77a are formed. There is formed a through hole 77 comprising a horizontal hole 77 b penetrating through the through hole.

In addition, the tool gripper 7 8 is formed integrally with a grip body 79 and a screw shaft portion 82 which is screwed with the screw portion 76 of the mounting hole 75 of the rotary shaft 72. A mounting recess 80 that houses a tool attachment / detachment mechanism 81 that allows the rotary tool 68 to be attached and detached by one-touch operation (the description is omitted) is formed, and a screw shaft portion 8 2 is provided at a depth end of the attachment recess 80. A through hole 83 is provided along the axis (center line C of the rotating shaft 72).

A housing 84 is formed on the outer periphery of the rotating shaft 72. The housing 84 is formed in a circular shape similarly to the housing 63 described above, and for example, at both ends thereof. For example, a fitting recess 85 is formed to fit a bearing metal 86 made of oil-impregnated metal or the like, and a bushing 67 connected to an air supply source is attached to the outer periphery of the housing. An air chamber 87 is formed on the outer periphery of the rotating shaft 72 by being mounted via the metal 86. The rotary joint 71 formed in this way has a rotary tool 68 attached to the tool gripper 78 by a one-touch operation, and the high E air from the air supply source is introduced into the air chamber 87, which is further passed through. The holes 77 and the through holes 83 supply the water to the holes 69, and are provided so as to be discharged from the discharge holes 69a.

However, in this rotary joint 5-7, if the operator tries to remove and replace the rotary tool 68 while inadvertently supplying high-pressure air without turning off the air supply source, the operator grips the rotary tool 68. Do not loosen the tightening bolts 59, or operate the tool attachment / detachment mechanism 81 in the loosening direction, and the high-pressure air will cause the rotating tool 68 to pop out at a high speed (2 to 3 Experiments have confirmed that it flies.) There is a problem that may cause injury to workers.

With the rotary joints 51 and 71 attached to the main shaft of the woodworking machine, and with the tillage tool 68 attached, the rotary joints 51 and 71 have nuts 55 or spanner hooks 74 and housings. 6 3, 8 4, tool gripping section 56, and gripping body 79 are provided in a series, so the overall length is long, and when the rotary tool 68 is mounted, the mounting length from the spindle 50 , The run-out of the rotary tool 68 caused shaft run-out, resulting in poor machining accuracy and reduced machining quality.

DISCLOSURE OF THE INVENTION

An object of the present invention is to solve the above-mentioned conventional problems, and it is possible to prevent a rotating tool from jumping out at the time of tool change even when a high-pressure air is supplied, so that an An object of the present invention is to provide a rotary joint for woodworking which can ensure safety and can minimize shaft run-out caused by the interposition of a rotary joint, thereby improving machining accuracy.

When the tool inserted in the tool mounting hole moves in a direction in which the tool inserted in the tool mounting hole comes off inside a through hole that opens on the outer periphery of the rotary shaft of the rotary joint of the present invention and the other end opens in the back of the tool mounting hole of the tool gripping part, That is, a mechanism for shutting off the gas supply is provided.

As a result, even when gas is supplied to the rotary joint, the rotary tool is removed from the tool gripper. When the rotary tool is moved in the direction, the gas supply is automatically shut off, preventing the tool from jumping out when changing the rotating tool, and ensuring the safety of the operator.

Further, in order to reduce the distance between the bearings at both ends of the housing, a connection portion with a supply pipe for supplying gas to the housing is provided outside the radius of the bearing and away from the shaft center.

As a result, the axial length of the housing can be shortened, the overall length of the rotary joint is shortened accordingly, and shaft runout is eliminated, so that machining accuracy with the rotary tool can be improved and quality can be improved. Can be.

[Brief description of the drawings]

Figure 1 is a sectional view of a woodworking rotary joint.

FIG. 2 is a bottom view of the woodworking rotary joint on the tool gripping portion side.

FIG. 3 is a diagram illustrating the operation of the gas shut-off mechanism of the rotary joint for woodworking.

FIG. 4 is a cross-sectional view of another gas shutoff mechanism of the rotary joint for woodworking.

FIG. 5 is an enlarged sectional view of the gas shut-off mechanism of FIG.

FIG. 6 is a cross-sectional view of another gas shut-off mechanism of the rotary joint for woodworking.

FIG. 7 is a sectional view taken along line AA of FIG.

FIG. 8 is a sectional view of a conventional rotary joint for woodworking.

FIG. 9 is a cross-sectional view of another conventional woodworking rotating hand.

BEST MODE FOR CARRYING OUT THE INVENTION

(Example)

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a rotary joint 1 for woodwork, wherein the rotary joint 1 has a rotary shaft 2 and a gas shutoff mechanism housed in the rotary shaft 2. 15 and a housing 27 externally mounted on the rotating shaft 2.

The rotary shaft 2 has a shaft portion 3 and a screw shaft portion 4 formed with a screw 4 a screwed to a main shaft 50 of a woodworking machine at one end of the shaft portion 3. A groove 3 a for a retaining ring 36 is recessed in the outer periphery near the end of the shaft 4, and a tool grip 5 is formed integrally with the other end of the shaft 3. A tool mounting hole 6 is formed at the center of the tool gripper 5 along the center line C of the rotating shaft 1 so that a shank 6 8 a of the rotary tool 68 can be inserted. Center line of the outer circumference of 5 A female screw portion 7 that penetrates the tool mounting hole 6 is screwed to tighten and fix the shank portion 6 8a, and a tightening bolt 8 is screwed to the female screw portion 7. Further, a wrench-hung recess 9 is formed in the outer periphery in the diametric direction, which is at an angle of 90 degrees from the female screw portion 7.

At the depth end of the tool mounting hole 6, a mounting hole 10 of the gas shut-off mechanism 15 having a diameter slightly smaller than that of the tool mounting hole 6 is formed, and at the depth end of the mounting hole 10. A spring seat 11 of a coil spring 25 constituting a gas shutoff mechanism 15 is provided. A screw portion 12 for mounting the slide pipe 16 of the gas shutoff mechanism 15 is screwed around a predetermined area from the end of the tool mounting hole 6 of the mounting hole 10. At a predetermined position of the mounting hole 10, a through hole 13 is formed so as to penetrate in the diametric direction of the shaft portion 3, and a through hole 13 is formed at an outer peripheral portion of the through hole 13. A concave groove 14 wider than the diameter of the hole 13 is formed. The gas blocking mechanism 15 is housed in the mounting hole 10 thus formed.

The gas shut-off mechanism 15 is composed of a slide pipe 16, a slide valve 20 and a coil spring 25, and the slide pipe 16 is screwed into the outer peripheral portion with a thread portion 12 of a mounting hole 10. It is formed in a circular shape having a screw portion 17 to be formed, and a flange portion 18 that fits into the tool mounting hole 6 of the tool holding portion 5 is formed at one end. The slide valve 20 has a slide shaft 21 of a predetermined length which is slidably fitted to the slide pipe 16, and a flange at one end (upper end) side of the two slide shafts 21. A part 22 is formed, and a convex shaft 23 passing through one end of the coil spring 25 is formed at the center of the flange part 22. A through hole 24 having a predetermined length is formed in the center of the slide shaft portion 21 along the axis thereof to open into the tool mounting hole 6. A diameter end is formed at a depth end of the through hole 24. A through hole 24a that opens in the direction is provided.

The slide shaft 21 of the slide valve 20 is inserted into the slide tube 16 thus formed with the 0 ring 26a fitted over the outside, and a predetermined shaft is inserted into the convex shaft 23. One end of a coil spring 25 having a spring pressure is fitted, and a ring 26 b is fitted over the slide tube 16. In this state, the threaded portion 17 of the slide tube 16 is attached. By screwing into the threaded portion 12 of the mounting hole 10, the other end of the coil spring 25 is fitted into the spring seat 11 provided in the mounting hole 10, and the slide tube 16 is further inserted. 0 link by screwing The screw 26 b is elastically adhered to the end of the tool mounting hole 6 to secure the airtightness of the screwing gap between the threaded portions 12 and 17, and the coil spring 25 is elastically compressed and the slide valve 20 is compressed. The end of the slide shaft 21 is urged toward the tool mounting hole 6 side and protrudes a predetermined length s toward the tool mounting hole 6 side, and the through hole 24 a enters the slide pipe 16. The ring 26 a is elastically adhered to the end face of the slide pipe 16 by the flange 22, and the airtightness of the gap between the slide shaft 21 and the inner diameter of the slide pipe 16 is reduced. Is secured. As described above, the housing 27 is attached to the outer periphery of the shaft portion 3 of the rotating shaft 2 in which the gas shutoff mechanism 15 is provided.

As shown in FIGS. 1 and 2, the housing 27 has a fitting base 28 having a predetermined width H that is fitted to the outer periphery of the shaft 3 and a projection 29 projecting from the base at a predetermined height. For example, as shown in the figure, it is formed into a deformed substantially octagonal outer shape which is symmetrical in the front-rear direction, and a fitting hole 30 is formed at the center of the fitting base portion 28 so as to fit to the shaft portion 3. A fitting recess 32 having a predetermined diameter for fitting a shield type bearing 31 is formed in the upper and lower portions of the base portion 28 concentrically with the fitting hole 30. A partition 33 having a predetermined width is formed between the two. The convex portion 29 is formed with an inlet 34 for connecting a supply pipe or the like from an air supply source to introduce high-pressure air, and this inlet 34 is connected to the center line C from the fitting concave portion 32. A high E air supply hole 35 penetrating through the fitting hole 30 from the partition wall 33 is formed at the bottom of the inlet 34. The bearing hole 31 is fitted in the upper and lower fitting recesses 3 2 of the housing 27 formed as described above, and is fitted outside the shaft portion 3. The housing 27 is prevented from coming off by a retaining ring 36, and the rotating shaft 2 is rotatably supported by the housing 27 in this state.

The rotary joint 1 thus formed is attached to a main shaft 50 of a woodworking machine via a screw shaft portion 4, and a supply pipe from an air supply source is connected to an inlet 34 of the housing 27. In this state, the slide valve 20 of the gas shut-off mechanism 15 is urged by the coil spring 25 so that the through hole 24a is immersed in the inner diameter of the slide pipe 16 and the end of the slide shaft 21. The portion protrudes by a predetermined length s toward the tool mounting hole 6 side of the tool gripper 5. Insert the shank 68 a of the rotating tool 68 into the tool mounting hole 6 in this downright position Push the slide shaft 21 against the coil spring 25 and tighten the bolts on the tool gripper 5 with the end of the shank 68 a contacting the slide tube 16 as shown in Fig. 3. 8 is screwed in and the rotary tool 6 8 is tightened and fixed. In this state, the hole 69 of the rotary tool 68 communicates with the through hole 24 of the slide valve 20, and the through hole 24a of the slide valve 20 projects from the inner diameter of the slide pipe 16. It is pushed and held at almost the same position as the through hole 13 of the shaft portion 3. When the main shaft 50 rotates in this state, the rotary tool 68 is rotated or given to the rotary tool 68 to perform a drilling operation. The high-pressure air from the air supply source passes through the supply hole 35 through the supply hole 35 and the groove 14 Is supplied to the fine holes 69 through the through holes 13, 24 a, 24, and is ejected from the ejection holes 69 a to the cutting edge portion 68 c to discharge chips from the holes. .

Then, when replacing the rotary tool 68, if the tightening bolt 8 is loosened while supplying high-pressure air, the slide valve 20 is instantaneously moved by the pressure of the high-pressure air and the restoring force of the coil spring 25 to pass through. The hole 24a is immersed in the inner diameter of the slide pipe 16 to block high-pressure air, and the gap between the inner diameter of the slide pipe 16 and the slide shaft 21 is zero-ring 26a. Are elastically adhered to each other to prevent air leakage.

Therefore, when the rotating tool 68 is loosened, the rotating tool 68 stops moving only by the protrusion S of the slide shaft 21 and is prevented from jumping out at a high speed as in the past. The safety of the person can be secured. Further, the housing 27 is formed with a fitting base 28 externally fitted to the shaft 3 of the rotating shaft 2 and a projection 29 protruding from the fitting base 28. A high-pressure air inlet 34 is provided in the fitting recess 3 2 of the ring 31 formed concentrically with the hole 30, that is, the convex portion 29 outside the radius of the bearing 31. As a result, the spacing between the bearings 31 is significantly shorter than that of the conventional housings 63, 84.In addition, the tool holder 5 is provided with a wrench hooking recess 9 so that the conventional nut 55 or wrench hooking can be used. Since the mounting of the part 74 and the forming part are eliminated and the entire length of the rotary joint 1 is shortened as much as possible, the axial runout of the rotary tool 68 can be reduced and the machining accuracy can be improved.

In the above embodiment, the gas shut-off mechanism 15 is exemplified by the slide pipe 16 and the slide valve 20 having the through holes 24 and 24a, but the present invention is not limited to this. The gas shut-off mechanism 37, 1 shown in FIG. 4 to FIG. Good. In other words, the gas shut-off mechanism 37 shown in FIGS. 4 and 5 has a mounting hole formed in the center of the shaft 3 at the depth end of the tool mounting hole 6 of the tool gripper 5 of the rotating shaft 2 in the same manner as described above. 1 The interior of the OA is provided with a through hole 13 at the depth end of the mounting hole 10 A in the diametrical direction of the shaft portion 3. The shutoff mechanism 37 is composed of a valve seat member 38 and a ball valve 40 as shown in FIG. The valve seat member 38 is formed in a cylindrical shape to be fitted into the mounting hole 10 A. The valve seat surface 3 9 a is formed on the inner periphery of the end of the valve seat member 38 on the tool mounting hole 6 side. There is formed a valve seat 39 having an opening hole 39 b in which a ball valve 40 having a predetermined diameter is fitted. Thus, the valve seat member 38 with the ball valve 40 interposed is fitted in the mounting hole 1OA. The other configuration is the same as that of the rotary joint 1 described above. With the rotary joint 1 equipped with the gas shut-off mechanism 37 mounted on the main shaft 50 of the woodworking machine, as shown in FIG. Is seated on the valve seat surface 39a of the valve seat 39, and a part 40a of the spherical surface of the ball valve 40 projects from the opening hole 39b to the tool mounting hole 6 side as shown by a broken line. The opening 39 b is closed. In addition, a groove 68 d is provided on the end face of the shank portion 68 a of the rotary tool 68 attached to the tool mounting hole 6 in a linear or cross shape around the hole 69. The 40 spherical surface prevents the end of the pore 69 from being closed, and the end of the concave groove 68 d is closed. By inserting the shank part 68 a of the rotary tool 68 provided in this way into the tool mounting hole 6 and tightening and fixing it with the tightening bolt 8, the projecting part 40 protruding from the tool mounting hole 6 is formed. a is pushed in, the ball valve 40 is positioned at an undefined position with respect to the valve seat surface 39 a of the valve seat 39, and a gap t is generated between the ball valve 40 and the valve seat surface 39 a, When high-pressure air is introduced in this state, the high-pressure air is supplied to the pores 69 from the gap t. When the tightening bolt 8 is loosened when the rotary tool 68 is replaced, the ball valve 40 is instantaneously positioned at the fixed position of the valve seat 39 by the force of the high E air, and the opening 39 b is closed and the high pressure is applied. The supply of air is shut off and the rotating tool 68 is prevented from jumping out.

Next, the gas shut-off mechanism 41 shown in FIGS. 6 and 7 includes a valve seat member 42 and a pin valve 45. The valve seat member 42 is attached to the mounting hole 10A of the rotary shaft 2 described above. A large-diameter hole 43a and a small-diameter hole 43b are formed in the center at the center. W

-9

At the same time, a valve seat surface 44 is formed at a predetermined angle in this step. Also, the pin valve 45 has a smaller diameter than the large diameter hole 43a of the valve seat member 42 and has a gap t1 so that it can be slidably fitted to the head 45a and the small diameter hole 43b. And a pin portion 45b, which is fitted so as to be able to be mounted, is integrally formed with the valve seat surface 4 of the valve seat member 42 on the side of the pin portion 45b of the head portion 45a. A valve face 46 is formed. The tip of the pin portion 45b is notched obliquely at a predetermined angle to form an inclined surface 45c. Vent grooves 47 are recessed at intervals. By mounting the pin valve 45 through the thus formed valve seat member 42 in the mounting hole 10A, when high-pressure air is introduced from the inlet 34, the pressure is reduced to the head. Acting on the end face of the portion 45a, the valve face 46 is brought into surface contact with the valve seat surface 44, and the ventilation to the ventilation groove 47 formed in the pin portion 45b is cut off. The leading end of 45b protrudes toward the tool mounting hole 6 for a predetermined length. Therefore, when the rotating tool 68 is tightened and fixed in the tool mounting hole 6, the pin valve 45 is pushed in as shown in FIG. 6, and the valve face 46 is separated from the valve seat surface 44 to vent the gap t1 and the ventilation. The groove 47 is communicated, and the high-pressure air is supplied to the pore 69 of the rotary tool 68. When the tightening bolt 8 is loosened when the rotary tool 6 8 is replaced, the pressure of the high-pressure air instantaneously acts on the head 45 a of the pin valve 45, and the pin valve 45 is pushed out, and the valve face 46 is closed. The high-pressure air is shut off by surface contact with the surface 44, and the rotating tool 68 is moved only by the amount of protrusion of the pin valve 45, and is prevented from jumping out.

As described above, the gas shut-off mechanism has various configurations as described above. In short, when the shank part 68 a of the rotary tool 68 is inserted deep into the tool mounting hole 6, the shut-off of high-pressure air is released. However, it is sufficient if the high pressure air is instantaneously shut off when the fastening of the shank part 68a is released. Further, in the above embodiment, the gas shut-off mechanism of the tool gripper 5 for fixing the rotary tool 68 with the tightening bolt 8 is illustrated as an example. It is also possible to apply these gas shut-off mechanisms to the ones. Further, the shield type bearing 31 is fitted to the bearing of the housing 27 as an example, but the present invention is not limited to this, and an oil-free bearing such as an oil-impregnated metal may be used. The outer shape of the housing 27 is formed into a deformed octagon. However, the present invention is not limited to this, and may be formed in, for example, a substantially rectangular block shape, an elliptical shape, or a substantially egg shape.

When installing multiple rotary joints on a machine with multiple spindles, such as a multi-axis drilling machine, separate rotary joints may be installed individually, but the housing is housed in one case and supplied from a gas supply source. One tube may be used.

According to the present invention, as described above, even when the rotary joint is in a gas supply state, the supply of gas is automatically shut off when the rotary tool moves in a direction away from the tool gripping portion. Preventing the tool from popping out when changing tools ensures operator safety.

In addition, the length of the housing in the axial direction can be shortened, and the overall length of the rotary joint can be shortened accordingly, eliminating shaft runout, improving machining accuracy with the rotary tool and improving quality. Can be.

Claims

The scope of the claims

1. When a tool that has been inserted into the tool mounting hole moves in the direction in which the tool inserted into the tool mounting hole comes off inside the through hole that opens on the outer periphery of the rotary shaft of the rotary joint and the other end opens behind the tool mounting hole in the tool gripper. A rotary joint for woodworking for gas supply, comprising a mechanism for shutting off gas supply.

2. For woodworking for gas supply, characterized in that the joint with the supply pipe that supplies gas to the housing is provided outside the radius of the bearing and away from the shaft center to reduce the distance between the bearings at both ends of the housing. Rotary joint.