KR200358596Y1 - Air driving type edge cutter - Google Patents

Abstract

The present invention relates to a pneumatic edge cutter, a tool holder in a pneumatic edge cutter used to perform the finishing treatment on the edge of the workpiece of the pneumatic tool operated by the compressed air supplied from the outside And rotor shaft can be combined or separated in the same straight line by screwing method, and constraining the rotational movement of the rotor shaft when separating or joining the tool holder. It is possible to improve the productivity and assemblability by making it possible to simplify the internal structure.

The present invention is a cylindrical housing made of a predetermined diameter and length; A cylinder inserted into the housing and coupled to the inside of the housing to form an eccentric through hole along a longitudinal center line, and a plurality of compressed air injection holes formed at a predetermined position on an outer circumferential surface thereof; A rotor having a shape in which a plurality of blades are inserted into and coupled to the inside of the cylinder and rotated by a blowing force of compressed air at a predetermined interval; A rotor shaft which protrudes along a center line in a longitudinal direction from the center of the front and rear surfaces of the rotor and rotates in the same direction as the rotor, and has a screw portion formed over a predetermined length on the outer peripheral surface of the front end portion, and a rear end portion having a rectangular cross-sectional structure; A tool holder having a rear end portion detachably coupled to the front end portion of the rotor shaft in a screwed manner in a state in which it is inserted into the front end portion of the housing, and having a tip coupling portion formed at the front end portion; A case surrounding a front end portion of the housing by an inner joint and an outer joint coupled to the front circumference of the front end and the rear circumference of the housing by a screw coupling method; A body coupled to the outer circumference of the case by adjusting a height to adjust a cutting amount for the workpiece, and a body having a through hole formed at a central portion of the front surface to which the tool holder can be sufficiently fitted; A housing cover fixedly coupled to a rear end of the housing and having a shaft fitting hole formed at a central portion thereof to which the rear end of the rotor shaft is fitted; A compressed air control member controlling compressed air supplied into the cylinder in a state in which it is coupled to an outer circumferential surface of the housing corresponding to a position where the compressed air injection hole on the cylinder is formed; A handle screwed to an outer circumferential surface of the housing corresponding to a position away from the compressed air control member and having an air discharge hole for discharging compressed air therein; Is coupled to the outside of the housing cover includes a rotor shaft rotation preventing means for restraining the rotor shaft is not rotated arbitrarily while moving linearly in the radial direction in accordance with the external force during the detachment operation of the tool holder for the rotor shaft.

Description

Pneumatic Edge Cutter {AIR DRIVING TYPE EDGE CUTTER}

The present invention relates to a pneumatic edge cutter, and more particularly, pneumatic edge used to perform the finishing treatment of the edge of the workpiece of the pneumatic tool operated by the compressed air supplied from the outside The tool holder and the rotor shaft in the cutter can be combined or separated by screwing on the same straight line, and the rotational movement of the rotor shaft can be restrained when the tool holder is separated or joined. The present invention relates to a pneumatic edge cutter capable of significantly improving the convenience of use by configuring and improving productivity and assemblability by simplifying the internal structure.

In general, a pneumatic tool uses compressed air supplied at high pressure from an external compressor to rotate a tool holder coupled to a rotor and a rotor shaft while performing a necessary task by a tip coupled to a tool holder. It is a very useful tool widely used in various industrial sites such as automatic assembly of bolts / nuts, finishing works of metal castings using grinders, and surface processing of plastic castings in various production lines such as automobiles and electronic products.

1 is a cross-sectional view showing a coupling state of a pneumatic grinder as an example of a conventional pneumatic tool.

Referring to this, the conventional pneumatic grinder 10 is fitted with a cylindrical housing 11 having a predetermined diameter and length and fitted inside the housing 11, and has an eccentric through hole along a longitudinal center line ( A rotor 15 in which a cylinder 13 having a 12 formed therein and a plurality of blades 14 rotated in accordance with the supply of compressed air in a state of being fitted into the cylinder 13 and coupled thereto, and the rotor 15 It is formed along the longitudinal center line of the rotor shaft 17 and the cylinder 13 is integrally connected to the first bevel gear 16 for coupling with a tool or tool holder for performing the final work at the end The rear end of the rotor shaft 17 is coupled to the rear end of the cylinder shaft plate 17, the compressed air inlet hole 18 is formed, and the rear end of the housing 11 is compressed air into the cylinder 13 Compressed air control member 20 for controlling the supply and the rotor It is inserted into the front end of the housing 11 so as to be orthogonal to the direction in which the shaft 17 is formed, and is installed to rotate. In a predetermined position, the first bevel gear 16 provided at the front end of the rotor shaft 17 is engaged to rotate. And a grinder shaft 22 having a second bevel gear 21 to be installed, and a grinder 23 having a predetermined diameter fixedly coupled to an outer end of the grinder shaft 22.

Referring to the operation of the conventional pneumatic grinder made as described above are as follows.

When the compressed air control member 20 is opened while the external air compressor is operating, compressed air flows into the cylinder 13 through the compressed air inlet hole 18 formed in the cylinder back plate 19 and is injected. do.

As the compressed air injected into the through hole 12 of the cylinder 13 and injected into the blade 14 fitted into the rotor 15 is rotated, the blade is rotated, and the rotor is rotated by the rotational force of the blade 14. 15 and the rotor shaft 17 are rotated at a high speed in the through-hole 12 formed eccentrically.

When the rotor 15 is rotated at a high speed in place as described above, centrifugal force is generated. Each blade 14 fitted to the rotor is moved outward by a predetermined distance by the centrifugal force and rotated in contact with the inner wall surface of the cylinder.

In this process, when the blade 14 reaches the eccentric portion of the inner wall surface of the cylinder 13 corresponding to the short axis of the through hole 12, it is pressed again by the inner wall of the cylinder and pushed back into the reinsertion groove. Sliding along the formation direction of the fitting groove is passed by the rotational force by the action of the compressed air.

By the rotation of the rotor 15 and the rotor shaft 17, the first bevel gear 16 coupled to the distal end of the rotor shaft 17 is rotated and engaged with the first bevel gear 16. As the second bevel gear 21 is rotated, the grinder shaft 22 is rotated, and the grinder 23 fixedly coupled to the outer end of the grinder shaft 22 is rotated to perform a predetermined work.

However, in the conventional pneumatic grinder 10, the combination of the first bevel gear 16 and the grinder, which functions as a tool holder, is made by engagement engagement using another second bevel gear 21. The problem is that the replacement of the tool is very cumbersome and inconvenient.

In addition, when the first bevel gear 16 or the tool holder is integrally connected to the rotor shaft 17, the entire first bevel gear 16 or the tool holder needs to be replaced when the parts are damaged. It is detachably coupled with respect to 17). In the case where the tool holder is detached from or coupled to the rotor shaft 17, there is no means for restraining any rotation state of the rotor shaft 17. Since the whole product needs to be disassembled, the replacement of the tool holder is very inconvenient and takes a long time.

In addition, when the tool holder which performs a predetermined work like the conventional pneumatic grinder 10 is combined with the rotor shaft 17 in the orthogonal direction instead of being coupled on the same straight line, the internal structure becomes relatively complicated, thus improving productivity and assembly. There is a problem that the property is very poor, and the volume of the product is increased to inhibit the compactness or light weight.

The present invention is to solve such a conventional problem, the object of the pneumatic tool operated by the compressed air supplied from the outside in the pneumatic edge cutter used to perform the finishing treatment on the edge of the workpiece The tool holder and the rotor shaft can be combined or separated by screwing on the same straight line, and the rotor shaft can be restrained when the tool holder is separated or joined. Therefore, to provide a new type of pneumatic edge cutter to significantly improve the ease of use, such as replacement of parts, and to improve productivity and assembly by simplifying the internal structure.

1 is a cross-sectional view of a conventional pneumatic grinder,

2 is an exploded perspective view of the pneumatic edge cutter according to the present invention,

3 is an enlarged exploded perspective view of the main portion of the pneumatic edge cutter according to the present invention,

4 is a perspective view showing a coupled state of the pneumatic edge cutter according to the present invention,

5 is a cross-sectional view of the coupled state of the pneumatic edge cutter according to the present invention,

Figure 6 is an enlarged cross-sectional view of the main portion coupled state of the pneumatic edge cutter according to the present invention,

7 is a plan view showing an operating state of the pneumatic edge cutter according to the present invention.

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

41 housing 44 cylinder

46: rotor 47: rotor shaft

48: thread 49: tool holder

50: coupling groove 54: guide roller

58: Case 61: Body

68: housing cover 72: rotor shaft rotation prevention means

73: stopper cover 74: stopper

76: stopper fixing member 75: stopper lever

77: guide 80: spring

56, 81: steel ball 82: shaft fixing groove

84: position fixing groove.

In order to achieve the above object, the present invention is a cylindrical housing made of a predetermined diameter and length; A cylinder inserted into the housing and coupled to the inside of the housing to form an eccentric through hole along a longitudinal center line, and a plurality of compressed air injection holes formed at a predetermined position on an outer circumferential surface thereof; A rotor having a shape in which a plurality of blades are inserted into and coupled to the inside of the cylinder and rotated by a blowing force of compressed air at a predetermined interval; A rotor shaft which protrudes along a center line in a longitudinal direction from the center of the front and rear surfaces of the rotor and rotates in the same direction as the rotor, and has a screw portion formed over a predetermined length on the outer peripheral surface of the front end portion, and a rear end portion having a rectangular cross-sectional structure; A tool holder having a rear end portion detachably coupled to the front end portion of the rotor shaft in a screwed manner in a state in which it is inserted into the front end portion of the housing, and having a tip coupling portion formed at the front end portion; A case surrounding a front end portion of the housing via an inner joint and an outer joint coupled to the front and rear circumferences of the front end of the housing by a screw coupling method; A body coupled to the outer circumference of the case by adjusting a height to adjust a cutting amount for the workpiece, and a body having a through hole formed at a central portion of the front surface to which the tool holder can be sufficiently fitted; A housing cover fixedly coupled to a rear end of the housing and having a shaft fitting hole formed at a central portion thereof to which the rear end of the rotor shaft is fitted; A compressed air control member controlling compressed air supplied into the cylinder in a state in which it is coupled to an outer circumferential surface of the housing corresponding to a position where the compressed air injection hole on the cylinder is formed; A handle screwed to an outer circumferential surface of the housing corresponding to a position away from the compressed air control member and having an air discharge hole for discharging compressed air therein; Is coupled to the outside of the housing cover includes a rotor shaft rotation preventing means for restraining the rotor shaft is not rotated arbitrarily while moving linearly in the radial direction in accordance with the external force during the detachment operation of the tool holder for the rotor shaft.

In the present invention, the rotor shaft rotation preventing means is fixedly coupled to maintain a certain distance with the housing cover on the outside of the housing cover, a guide hole having a predetermined length is formed on the radial center line, the side where the guide hole is formed A stopper cover of a disc shape having an opening having a predetermined width on a corresponding circumferential surface thereof; A stopper for restraining or releasing the rear end of the rotor shaft while linearly moving in the radial direction within the range of the guide hole in accordance with a user's operation in a state fitted between the housing cover and the stopper cover corresponding to the position of the guide hole; A stopper lever inserted through the guide hole from the outside of the stopper cover to linearly move the stopper in a state coupled to the stopper; And a stopper fixing member installed on the housing cover corresponding to the movement path of the stopper to elastically fix the stopper at the forward end point and the rear end point of the stopper.

The stopper fixing member in the present invention as described above is a spring fitted to each of the left and right pair of installation grooves formed on the surface of the housing cover corresponding to the movement path of the stopper; and composed of steel balls supported on the upper ends of the springs.

In the present invention, the stopper is formed in a hexahedral shape, a shaft fixing groove into which the rear end of the rotor shaft is fitted is formed at the center of the front end portion, and a fastening hole is formed at a predetermined portion of the upper surface to which the stopper lever is coupled. It has a feature consisting of a structure in which the position fixing groove is fitted into the steel ball constituting the stopper fixing member at a point corresponding to the front moving end point and the rear moving end point.

In the present invention, a roller engaging portion having a groove having a predetermined depth protrudes from the center of the tip end portion of the tool holder, and the roller engaging portion is fitted with a disc-shaped guide roller for adjusting the cutting amount of the tip. At a predetermined position on the outer circumferential surface of the guide roller, a ball fitting hole penetrating to the inner circumferential surface is formed so that a plurality of steel balls serving as bearings can be inserted through the ball fitting holes and seated in a groove on the roller engaging portion.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is an exploded perspective view showing the pneumatic edge cutter according to the present invention, Figure 3 is an enlarged separated perspective view of the main portion of the pneumatic edge cutter according to the present invention.

In addition, Figure 4 is a perspective view showing a coupling state of the pneumatic edge cutter according to the present invention, Figure 5 is a cross-sectional view of the coupling state of the pneumatic edge cutter according to the present invention, Figure 6 is a pneumatic edge cutter of the present invention An enlarged cross-sectional view of the main part coupling state.

Referring to this, in the pneumatic edge cutter according to the present invention, the tool holder and the rotor shaft are configured to be detachably coupled to each other on the same center line, and the rotor shaft rotation preventing means for preventing the rotor shaft from rotating arbitrarily during the detachable operation is provided. It is provided.

To this end, the pneumatic edge cutter 40 according to the present invention is provided with a cylindrical housing 41 having a predetermined diameter and length, the inside of the housing 41, the through hole of the eccentric along the longitudinal center line ( 42 is formed, and a cylinder 44 having a plurality of compressed air injection holes 43 is fitted in a predetermined position on the outer circumferential surface thereof.

Inside the cylinder 44, a plurality of blades 45, which are rotated by the injection force of the compressed air, are fitted around the rotor 46 in a predetermined interval.

A rotor shaft 47 of a predetermined length extends from the centers of the front and rear surfaces of the rotor 46 along its longitudinal center line.

The rotor shaft 47 is rotated in the same direction during the rotation of the rotor 46, the threaded portion 48 is formed on the outer peripheral surface of the front end portion over a predetermined length range, the rear end is made of a rectangular cross-sectional structure.

The tool holder 49 is fitted from the outside of the front end of the housing 41 to the inside, and the screw 48 of the tip of the rotor shaft 47 is fitted into the rear end of the tool holder 49 to be screwed together. The groove 50 is formed, and the tip coupling portion 51 for mounting the tip is formed at the tip of the tool holder 49.

From the center of the tip of the tool holder 49, a roller engaging portion 53 having a groove 52 having a predetermined depth protrudes from the center, and the roller engaging portion 53 has a disc shape for adjusting the cutting amount of the tip. Guide rollers 54 are fitted and coupled.

The guide roller 54 is formed with a ball fitting hole 55 penetrating to the inner circumferential surface at a predetermined position on the outer circumferential surface thereof, the ball fitting hole ( When the small steel ball 56 is pushed through 55, the steel ball 56 is seated in the groove 52 formed around the roller engaging portion 53 to function as a bearing, and the ball fitting hole 55 It is configured to be blocked by the bolt (57).

A separate case 58 is installed around the distal end of the housing 41 through an inner joint 59 and an outer joint 60.

The inner joint 59 is screwed around the front end of the housing 41, the outer joint 60 is screwed around the rear end of the housing 41, and the case 58 is the inner joint. 59 is coupled to the outer peripheral surface of the outer joint 60 in a screwed manner.

The outer periphery of the case 58 is screwed to the body 61 for adjusting the cutting amount for the workpiece while the height is adjusted in the vertical direction, the flange portion having a predetermined width at the leading edge of the body 61 62 is formed, and the front center portion has a structure in which a through hole 63 of a size to which the tool holder 49 can be sufficiently fitted is formed.

A plurality of screw fitting holes 64 are formed at predetermined intervals at predetermined positions on the outer circumferential surface of the body 61, and the fixing screw is fixed to the screw fitting holes 64 while the body 61 is screwed to the case 58. By fitting 65, the engagement of the body 61 to the case 58 is more firmly maintained.

In addition, on the outer circumferential surface of the body 61 corresponding to a position different from the screw fitting hole 64, the adjustment amount necessary for cutting amount adjustment (adjustment depth of engagement) or an engagement and separation operation in the state coupled to the case 58 is required. A plurality of wrench fitting holes 66 are formed to be fitted.

The rear end of the housing 41 is fixedly coupled to the disk-shaped housing cover 68 formed with a shaft fitting hole 67 in which the rear end of the rotor shaft 47 can be fitted.

A general compressed air control member 69 for controlling compressed air supplied into the cylinder 44 is coupled to the outer circumferential surface of the housing 41 corresponding to the formation position of the compressed air injection hole 43 on the cylinder 44. do.

In addition, the handle 70 is screwed to the outer circumferential surface of the housing 41 corresponding to a position away from the compressed air control member 69, the air discharge for discharging the compressed air inside the handle 70 A ball 71 is formed.

On the other hand, the outer side of the housing cover 68, the rotor shaft 47 is not rotated arbitrarily while moving linearly in the radial direction (center side) by the external force during the detachment operation of the tool holder 49 to the rotor shaft 47 The rotor shaft rotation preventing means 72 is installed so as to restrain.

The rotor shaft rotation preventing means (72) is a stopper cover (73) fixedly coupled to maintain a predetermined distance from the housing cover (68) outside the housing cover (68), and the housing cover (68) and the stopper cover (73). A stopper 74 for restraining or releasing the rear end of the rotor shaft 47 and a stopper lever which is coupled to the stopper 74 to operate the stopper while being linearly moved along the radial direction in accordance with the user's operation in the state of being fitted therebetween. 75 and a stopper fixing member 76 which is fixed in the state in which the stopper 74 is moved along the radial direction.

The stopper cover 73 has a disc shape, and has a guide hole 77 having a predetermined length along a radial center line, and an opening having a predetermined width in a circumferential surface corresponding to the side where the guide hole 77 is formed. 78 is formed.

The stopper fixing member 76 includes springs 80 respectively fitted to a pair of left and right installation grooves 79 formed on the surface of the housing cover 68 corresponding to the movement path of the stopper 74, and the springs 80 respectively. It is composed of a steel ball 81 supported at the upper end of the.

The stopper 74 is formed between a housing cover 68 and the stopper cover 73 and is formed in a hexahedral shape having a thickness that can be moved without interference.

A shaft fixing groove 82 having a predetermined depth into which the rear end of the rotor shaft 47 is fitted is formed at the center of the front end portion of the stopper 74, and the fastening hole 83 to which the stopper lever 75 is coupled to a predetermined portion of the upper surface. It is formed, the bottom surface has a structure in which a position fixing groove 84 is fitted into the steel ball 81 constituting the stopper fixing member 76 at a point corresponding to the front moving end point and the rear moving end point.

In this configuration of the present invention, reference numeral 85 is a bearing, reference numeral 86 is a rear plate, and reference numeral 87 is a front plate.

Referring to the coupling state and the operating state of the present invention made as described above are as follows.

2 to 6, the rotor 46 into which the blade 45 is fitted is first inserted into the through hole 42 of the eccentric cylinder 44, and the front plate ( The cylinder 44 is inserted into the housing 41 so that the compressed air injection hole 43 formed on the outer circumferential surface of the cylinder 44 in the state where the 87 is inserted is aligned with the engagement position of the compressed air control member 69. Insert it.

In this state, the compressed air control member 69 and the handle 70 are screwed to a predetermined position on the outer circumferential surface of the housing 41.

Then, the rear plate 86 and the housing cover 68 are sequentially positioned at the rear end of the housing 41, and the spring 80 and the steel ball () are installed in the installation groove 79 formed on the surface of the housing cover 68. While the 81 is installed, the stopper 74 is positioned so that the steel ball 81 is fitted into the position fixing groove 84 formed on the bottom in a state in which the shaft fixing groove 82 faces the center side.

In this state, the stopper cover 73 is positioned so that the guide slot 77 coincides with the movement path of the stopper 74. When the fixing bolt 88 is fastened, the housing cover 68 and the rotor shaft with respect to the housing 41 are fixed. The rotation preventing means 72 and the stopper cover 73 are combined.

Then, the stopper lever 75 is fitted through the guide hole 77 from the outside of the stopper cover 73 to be coupled to the fastening hole 83 formed on the upper surface of the stopper 74.

Meanwhile, the inner joint 59 and the outer joint 60 are screwed to the threaded portions formed at the front and rear circumferences of the outer circumferential surface of the distal end of the housing 41, respectively, and on the outside of the inner joint 59 and the outer joint 60. Screw the case 58.

In this state, the body 61 is screwed to the outer circumferential surface of the case 58, and the fixing screw 65 is inserted through the screw fitting hole 64 formed at a predetermined position on the outer circumferential surface of the body 61. The state of engagement of the body 61 with respect to the firm.

The fastening work, detachment work and cutting amount adjustment work (adjustment depth adjustment) of the body 61 with respect to the case 58 are fitted in the wrench fitting hole 66 formed on the outer circumferential surface of the body 61 and rotated in a predetermined direction. As it is done easily.

In this state, the tool holder 49 is inserted into the front end of the housing 41 through the through hole 63 formed in the front center of the body 61, and the coupling groove of the rear end of the tool holder 49 ( When the 50 is rotated while being fitted in accordance with the threaded portion 48 of the end of the rotor shaft 47, the front end of the rotor shaft 47 and the rear end of the tool holder 49 are screwed together.

When the tool holder 49 and the rotor shaft 47 are coupled to each other, the rotor shaft 47 should not be arbitrarily rotated.

In order to prevent any rotation of the rotor shaft 47, when the stopper lever 75 is pushed radially inward (center side), the stopper 74 is centered between the housing cover 68 and the stopper cover 73. The rear end of the rotor shaft 47 having a rectangular cross-sectional structure is fitted into the shaft fixing groove 82 formed at the front end of the stopper 74 as the linear shaft moves to rotate the rotor shaft 47 and the rotor 46. When the tool holder 49 is rotated in a predetermined direction in this state, the tip of the rotor shaft 47 is screwed into the coupling groove 50 of the rear end of the tool holder 49.

Then, the ball fitting hole penetrated from the outer circumferential surface of the guide roller 54 to the inner circumferential surface thereof in the state in which the guide roller 54 is fitted to the roller engaging portion 53 protruding from the front center of the tool holder 49. After pushing the plurality of steel balls 56 through the 55 to block the ball fitting hole 55 with the bolts 57, the grooves formed around the roller engaging portion 53, the steel ball 56 ( It is seated in 52 and acts as a bearing.

In this state, when the tip (edge cutter) that performs a predetermined function is coupled to the tip coupling portion 51 formed at the tip of the tool holder 49, the overall coupling state is completed.

The bearing 85 is fitted to a predetermined portion requiring a predetermined rotation in the coupling structure.

The operating state of the present invention in such a coupled state is as follows.

5 to 7, the external compressor and the compressed air control member 69 are connected to each other by a hose or the like, and the operator operates the stopper lever 75 radially outward in a state where the compressor is driven. Releases the restrained state of the rotor shaft 47 by the stopper 74, and operates the compressed air control member 69 to open the valve, and then the compressed air passes through the compressed air injection hole 43 on the cylinder 44. As the spraying force is generated in the blade 45 as the cylinder 44 is injected into the rotor 46, the rotor 46 is rotated in a predetermined direction.

When the rotor 946 is rotated, the tool holder 49 coupled to the rotor shaft 47 and the tip (edge cutter) coupled to the tip engaging portion 51 on the tool holder 49 are rotated at a high speed. Is performed.

At this time, the cutting amount of the workpiece by the tip can be adjusted by the coupling depth of the body 61 and the thickness of the guide roller 54 coupled to the case 58, the compressed air injected into the cylinder 44 Is again discharged to the outside through the air discharge hole 71 formed in the handle (70).

On the other hand, when it is necessary to separate and replace the tool holder 49 from the rotor shaft 47 in this state, the stopper 74 is pushed again when the stopper lever 75 is pushed radially inward (center side). ) Is linearly moved toward the center again so that the rear end of the rotor shaft 47 is fitted into the shaft fixing groove 82 formed at the tip of the stopper 74, thereby preventing any rotation of the rotor shaft 47.

In this state, when the tool holder 49 is rotated in the opposite direction as when coupled, the tool holder 49 is easily separated.

The linear movement of the stopper 74 is limited by the action of the guide slot 77 and the stopper fixing member 76, and the stopper 74 is moved forward or backward by the operation of the stopper lever 75. When reached, the steel ball 81 installed on the surface of the housing cover 68 is inserted into the position fixing groove 84 formed on the bottom surface of the stopper 74 is to prevent any movement forward or backward .

Since the steel ball 81 is elastically supported by the spring 80, even if the steel ball 81 is fitted into the position fixing groove 84 on the stopper 74 by the external force (operating force) applied to the stopper lever 75, the subsequent operation This will be possible.

Applying the present invention, since the tool holder is coupled on the same center line with respect to the rotor shaft, the size of the product can be reduced, and the rotor shaft is prevented by means of the rotor shaft rotation preventing means when the tool holder is attached to the rotor shaft. As the rotational state can be restrained, the detachable work can be made very easily, thus improving convenience of use such as replacement of parts, and greatly improving productivity and assemblability according to the simplification of the internal structure.

Claims (5)

A cylindrical housing having a predetermined diameter and length; A cylinder inserted into the housing and coupled to the inside of the housing to form an eccentric through hole along a longitudinal center line, and a plurality of compressed air injection holes formed at a predetermined position on an outer circumferential surface thereof; A rotor having a shape in which a plurality of blades are inserted into and coupled to the inside of the cylinder and rotated by a blowing force of compressed air at a predetermined interval; A rotor shaft which protrudes along a center line in a longitudinal direction from the center of the front and rear surfaces of the rotor and rotates in the same direction as the rotor, and has a screw portion formed over a predetermined length on the outer peripheral surface of the front end portion, and a rear end portion having a rectangular cross-sectional structure; A tool holder having a rear end portion detachably coupled to the front end portion of the rotor shaft in a screwed manner in a state in which it is inserted into the front end portion of the housing, and having a tip coupling portion formed at the front end portion; A case surrounding a front end portion of the housing via an inner joint and an outer joint coupled to the front and rear circumferences of the front end of the housing by a screw coupling method; A body coupled to the outer circumference of the case by adjusting a height to adjust a cutting amount for the workpiece, and a body having a through hole formed at a central portion of the front surface to which the tool holder can be sufficiently fitted; A housing cover fixedly coupled to a rear end of the housing and having a shaft fitting hole formed at a central portion thereof to which the rear end of the rotor shaft is fitted; A compressed air control member controlling compressed air supplied into the cylinder in a state in which it is coupled to an outer circumferential surface of the housing corresponding to a position where the compressed air injection hole on the cylinder is formed; A handle screwed to an outer circumferential surface of the housing corresponding to a position away from the compressed air control member and having an air discharge hole for discharging compressed air therein; It is coupled to the outside of the housing cover pneumatic pneumatics characterized in that it comprises a rotor shaft rotation preventing means for restraining the rotor shaft is not arbitrarily rotated while linearly moving in a radial direction in accordance with the external force during the detachment operation of the tool holder for the rotor shaft Edge cutter. The method of claim 1, A roller engaging portion having a groove having a predetermined depth is protruded from the center of the tip end of the tool holder, and a disk-shaped guide roller for adjusting the cutting amount of the tip is fitted into the roller engaging portion, and the outer peripheral surface of the guide roller is predetermined. A pneumatic edge cutter, characterized in that formed in the position is a ball fitting hole penetrating to the inner circumferential surface so that a plurality of steel balls that function as bearings can be inserted through the ball fitting hole to be seated in the groove on the roller coupling portion. The method of claim 1, The rotor shaft anti-rotation means is fixedly coupled to maintain a predetermined distance with the housing cover on the outside of the housing cover, a guide hole having a predetermined size is formed on the radial center line, the circumferential surface corresponding to the side where the guide hole is formed A stopper cover of a disc shape having an opening having a predetermined width; A stopper for restraining or releasing the rear end of the rotor shaft while linearly moving in the radial direction within the range of the guide hole in accordance with a user's operation in a state fitted between the housing cover and the stopper cover corresponding to the position of the guide hole; A stopper lever inserted through the guide hole from the outside of the stopper cover to linearly move the stopper in a state coupled to the stopper; And a stopper fixing member installed on a housing cover corresponding to the movement path of the stopper to resiliently fix the stopper at the forward movement end point and the rear movement end point of the stopper. The method of claim 3, wherein The stopper fixing member includes springs respectively fitted in a pair of left and right installation grooves formed on the surface of the housing cover corresponding to the movement path of the stopper; Pneumatic edge cutter, characterized in that consisting of steel balls supported on the upper end of each spring. The method of claim 3, wherein The stopper is formed in a hexahedral shape, a shaft fixing groove into which the rear end of the rotor shaft is fitted is formed at the center of the front end portion, and a fastening hole to which the stopper lever is coupled is formed at a predetermined portion of the upper surface, and the front end point and the rear of the front movement end are formed on the bottom surface thereof. The pneumatic edge cutter, characterized in that consisting of a structure formed with a position fixing groove for the steel ball constituting the stopper fixing member is formed at a point corresponding to the moving end point.