KR20100052790A - Transfer subsection of numerical control machine tools - Google Patents

Abstract

PURPOSE: A transfer system for a numerical control machine is provided to increase conveying speed by increasing the maximum allowable Revolution Per Minute of a ball screw. CONSTITUTION: A transfer system for a numerical control machine comprises a ball screw(12), a nut block(21), a shaft supporter(20), and a descending unit. The ball screw is rotated by the drive of a servo motor. The nut block straightly moves a transferring body by fastening a nut member and the transferring body. First and second idle rollers(92a,92b) are installed on the top of the shaft supporter and support the ball screw. When the nut block passes through the shaft supporter, the descending unit prevents the nut block from colliding with the shaft supporter by descending the shaft supporter.

Description

Transfer subsection of numerical control machine tools

The present invention relates to a feed system of a numerically controlled machine, and more particularly, a nut block and a ball screw are screwed through a nut member, and the nut block is moved to a precise position by controlling the rotation of the ball screw by a servomotor. It relates to a feed system of a numerically controlled machine.

In general, the numerical control processing machine 1 may be provided with a feed system 2 on one side of the main body as shown in FIG. 1, and a feed body 3 may be provided on the feed system 2.

The above-described feed system 2 is, for example, a nut block which is linearly moved by being fastened to the ball screw 12 and the ball screw 12 rotated by the driving force of the servo motor 11 and the servo motor 11 that are numerically controlled ( 14).

The nut block 14 described above is fixed to the above-mentioned conveying body 3 so that the conveying body 3 is linearly moved by the driving of the servomotor 11.

As the numerical control processing machine 1 is enlarged, the distance to which the conveying body 3 is to be conveyed becomes long, and thus the conveying system 2 becomes long, and thus the ball screw 12 is designed to be longer.

As described above, as the machine tool is enlarged, the ball screw 12 is designed to have a long length, but the feed speed of the feed system 2 is rather slow.

The problem of the above-described conveying speed will be described with reference to FIG. 2.

As the length of the ball screw 12 becomes longer, the amount of deflection is caused by its own weight and the natural frequency of the ball screw is lowered. Therefore, resonance occurs at a lower rotational speed and the maximum rotational speed of the ball screw is limited. It is impossible to obtain a feed rate.

As an example, a ball screw 12 having a diameter of 100 mm and a distance of 10,000 mm between both ends may be found to be very slow at a level of about 200 rpm when the allowable rotation speed is a typical installation condition (fixed-fixed support). As the allowable rotation speed is slow, the problem that the feed speed of the feed body 3 is lowered eventually occurs.

Therefore, the technical problem to be achieved by the present invention is to prevent the deflection of the ball screw in the feed system of the numerical control machine, thereby increasing the maximum allowable rotational speed of the ball screw, thereby increasing the feed rate of the feed system. The purpose is to provide.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, another technical problem that is not mentioned can be clearly understood by those skilled in the art from the following description. There will be.

The feed system of the numerical control machine according to the first and second embodiments of the present invention for achieving the above technical problem, the ball screw is installed in the frame and rotated by the drive of the servo motor; A nut block screwed to the ball screw and engaged with the table to linearly move the table; A shaft supporter installed at one side of the frame and provided with a plurality of first and second idle rollers on the upper side, wherein the plurality of first and second idle rollers support the ball screw; And lowering driving means for lowering the shaft supporter so that the nut block and the shaft supporter do not collide when the nut block passes through the shaft supporter.

In addition, a plurality of shaft supporters may be installed.

In addition, the shaft supporter, the cylinder is provided on one side of the frame; An elevating shaft disposed in the center of the cylinder and elevating; A compression spring installed inside the cylinder and applying a restoring force in a direction in which the lifting shaft is pushed up; And a plurality of first and second idle rollers disposed on an upper end of the elevating shaft and supported by the ball screw to rotate in contact with the ball screw.

In addition, a guide pin penetrates the piston 61 in a direction parallel to the direction of movement of the lifting shaft to one side of the lifting shaft and is installed on one side of the cylinder.

The elevating shaft may further include a supporter installed at an upper end thereof so as to be inclined in a left and right direction by a pivot shaft and having the plurality of first and second idle rollers installed thereon.

In addition, the pressing means for pressing the lifting shaft in the upward direction may be further included, wherein the pressing means has a first port and a second port is formed in the cylinder on the upper side and the lower side, respectively, Air pressure is supplied to the second port formed on the lower side and pressurizing in the direction of raising the lifting shaft; may be.

The lower driving means may include: first and second cam guides provided on one side of the nut block or the table, and cam cams are formed on both sides of the horizontal section, and the horizontal section is formed longer than the length of the nut block; An elevating shaft which is shot by a compression spring in the cylinder; And a plurality of first and second cam rollers installed on both upper ends of the lifting shaft and in contact with the plurality of first and second cam guides, respectively. The lifting shaft is lowered by cam driving when it comes in contact with the first and second cam rollers, and by the restoring force of the compression spring when the first and second cam guides are out of the plurality of first and second cam rollers. It may be to raise the lifting shaft.

In addition, the cylinder has first and second ports formed on the upper side and the lower side, respectively, based on the piston of the lifting shaft, and a nozzle part is installed to penetrate the piston through the lifting shaft, and the nozzle part on the upper side of the cylinder. And a plug is installed at a position corresponding to the nozzle, the nozzle part is closed by the plug when the lifting shaft is raised, and the nozzle part is opened when the lifting shaft is lowered so that the pressure of the upper side and the lower side of the piston is the same. May be;

In addition, the lower driving means, the upper and lower cylinders each formed with a first port; A lifting shaft installed inside the cylinder and rising or falling by air pressure provided to the first and second ports; And an electronically controlled directional valve for lowering the elevating shaft by supplying air pressure to the first port when the nut block enters an area adjacent to the shaft supporter.

Specific details of other embodiments are included in the detailed description and the drawings.

The feed system of the numerical control machine according to the first and second embodiments of the present invention made as described above prevents the ball screw from sagging, thereby increasing the allowable rotational speed of the ball screw. It is possible to improve the feed rate of the feed system.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

Like reference numerals refer to like elements throughout.

Hereinafter, the transfer system of the numerical control machine according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 7.

3 is a plan view illustrating a transfer system of a numerically controlled machine according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating an X-X line of FIG. 3.

3 and 4, in the feed system of the numerical control machine according to the first embodiment of the present invention, the servo motor 11 is disposed above the frame 15, and the servo motor 11 has a ball screw ( 12 is installed, and the ball screw 12 is supported by the housing 13 at both ends, respectively.

The above-described servomotor 11 is numerically controlled by a computer program, and the above-described ball screw 12 is rotated by the driving of the servomotor 11.

Further, the nut blocks 14 and 21 are fastened to the above-described ball screw 12, and the nut blocks 14 and 21 are fixed to the conveying member 3, and the conveying body 3 is a table. It may be itself or a separate table 3a may be additionally fixed.

3 and 4, a plurality of shaft supporters 20 may be arranged in a single ball screw 12, and the plurality of shaft supporters 20 equally lengthens the length of the ball screw 12. As shown in FIG. It may be arranged in a divided position, the more densely arranged in a larger number can be more effectively prevent the deflection of the ball screw 12 to implement a faster rotation speed.

In addition, the shaft supporter 20 is installed on one side of the frame 15 described above, and a plurality of first and second idle rollers 92a and 92b are installed on the upper side, and the plurality of first and second idle rollers described above. 92a and 92b support the above-described ball screw 12.

In addition, when the nut block 21 is passed through the shaft supporter 20 described above, the shaft supporter 20 is lowered to prevent the nut block 21 and the shaft supporter 20 from colliding with each other. Downward driving means is provided.

The transfer system of the numerically controlled processing machine according to the first embodiment of the present invention will be described in more detail with reference to the accompanying drawings, FIGS.

5 is an exemplary view showing an extraction system of the numerical control machine according to the first embodiment of the present invention, Figures 6 and 7 is a supporter in the transfer system of the numerical control machine according to the first embodiment of the present invention. Exemplary views taken from the drawings and partial cross-sectional views.

As shown in FIGS. 5 and 6, the cam guides may be arranged in the nut blocks 14 and 21, and the cam guides may be provided with first and second cam guides 25a on both sides of the ball screw 12. 25b may be installed.

As shown in FIG. 6, the cam inclined portion 28 is formed on both sides of the horizontal section, and the binding piece 27 is formed on the upper side of the first and second cam guides 25a and 25b. 27 may be installed in the nut block 21 and, on the other hand, may be installed in the conveying body 3 as shown in FIG.

The shaft supporter 20 described above will be described in more detail with reference to FIGS. 7 and 8.

The shaft supporter 20 includes a cylinder 30 installed at one side of the frame 15 described above, an elevating shaft 60 disposed at the center of the cylinder 30 above, and elevating the inside of the cylinder 30. The ball screw 12, which is installed and supported on the compression spring 75 for applying the restoring force in the direction of pushing up the above-mentioned lifting shaft 60 and the above-mentioned lifting shaft 60, is supported by the above-mentioned ball screw 12. ) And a plurality of first and second idle rollers (92a, 92b) described above to rotate in contact with.

That is, the plurality of first and second idle rollers 92a and 92b described above are moved in the direction in which the elevating shaft 60 is always pushed upward by the elastic force to the compression spring 75 described above. ) And when the external force is applied in the vertical direction, as the compression spring 75 is compressed, the plurality of first and second idle rollers 92a and 92b may be lowered.

In addition, as shown in FIGS. 7 and 8, the guide pin 70 penetrates the piston 61 in a direction parallel to the moving direction of the lifting shaft 60, and the guide pin ( 70 may be installed on one side of the cylinder 30 described above.

That is, the above-described guide pin 70 moves up and down linearly in a straight direction without shaking when the above-mentioned lifting shaft 60 moves up and down, thereby providing a plurality of first and second idle rollers 92a and 92b in a more stable state. ) Ascends.

In addition, the above-described lifting shaft 60 is installed to be inclined in the left-right direction by the pivot shaft 68 at the upper end as shown in FIGS. 6 to 8, and the plurality of first and second idle rollers ( 92a) and 92b may further include a supporter 80 installed therein.

The above-described lifting shaft 60 may have a slit 64 formed at an upper end thereof, and a first pivot boss 65 may pass through the sidewall of the slit 64.

In addition, the above-described supporter 80 may have an insertion piece 81 formed at a lower side thereof, and a second pivot boss 82 may be formed at the insertion piece 81.

The pivot shaft 62 is inserted to penetrate the above-mentioned first and second pivot bosses 65 and 82 in the state where the above-described insertion piece 81 is inserted into the above-mentioned slit 64, so that the supporter 80 is It can be tilted within a predetermined angle range.

Fastening elements such as nuts may be fastened to the ends of the above-described pivot shaft 68 so that the pivot shaft 68 may not be separated.

That is, the first and second cam guides are inclined and balanced by the pivot shaft 68 even if the plurality of first cam guides 25a and the second cam guide 25b are not kept horizontal due to unexpected reasons. The 25a, 25b and the 1st, 2nd cam roller 85a, 85b are made to contact.

In addition, the above-mentioned support 80 is inclined by the above-mentioned pivot shaft 68, so that the first and second idle rollers are actively inclined when the ball screw 12 vibrates and is not in the correct position. 92a and 92b are in close contact with the ball screw 12.

In addition, the pressing means for pressing the above-mentioned lifting shaft 60 in the upward direction may be further included.

In the above-described pressing means, the cylinder 30 has first and second ports 31 and 51 formed on the upper side and the lower side, respectively, based on the piston 61 of the elevating shaft 60, and formed on the lower side described above. Air pressure may be supplied to the second port 51 and air pressure may be exhausted from the first port 31 formed at the upper side.

The cylinder 30 described above will be described in more detail. As shown in FIG. 7, the cylinder cap 50 is fastened to the lower side of the cylinder 30, and the piston of the lifting shaft 60 is located in the cylinder 30. 61 is disposed, the first port 31 formed on the upper side is located above the piston 61, the second port 51 formed on the lower side may be located on one side of the above-described cylinder cap 50. .

A piston shaft 62 is formed below the piston 61, and the piston shaft 62 may be installed through the cylinder cap 50.

In addition, a seat groove for positioning of the compression spring 75 may be further formed below the piston 61, and a seat groove for positioning of the compression spring 75 is further formed above the cylinder cap 50. It can be formed so that the compression spring 75 is not oscillated arbitrarily and is always positioned in position.

On the other hand, the second port 51 described above may be in communication with the seat groove of the compression spring formed on the upper side of the cylinder cap 50 described above, which may have the advantage that the workability of the second port 51 becomes convenient. have.

That is, by continuously supplying the air pressure through the second port 51, the air pressure pressurizes the direction in which the piston 61 is pushed up from the lower side of the piston 61 upward in the cylinder 30.

As shown in FIGS. 6 and 7, the lower driving means of the transfer system according to the first embodiment of the present invention includes an upper side and a lower side relative to the piston 61 of the elevating shaft 60. The first and second ports 31 and 51 are formed at the lower side, respectively, and the nozzle part 63 is installed to penetrate the piston 61 through the lifting shaft 60 described above, and the upper side of the cylinder 30 is provided. The plug 35 is installed at a position corresponding to the nozzle part 63.

That is, when the lifting shaft 60 is raised, the nozzle part 63 is closed by the plug 35, and when the lifting shaft 60 is lowered, the nozzle part 63 is opened to open the piston 61. The pressure of the upper side and the lower side of) becomes the same.

On the other hand, the lower driving means of the transfer system according to the second embodiment of the present invention, as shown in Figs. 14 and 15, the first and second ports 31, 51 formed on the upper side and the lower side, respectively ( 30) in the region adjacent to the elevating shaft 60 and the shaft supporter 20, which are installed inside the cylinder 30 and which are raised or lowered by the air pressure provided to the first and second ports 31 and 51. When the nut block 21 enters the control unit includes an electronically controlled direction switching valve 100 for supplying air pressure to the first port 31 to lower the lifting shaft 60 in response to the command.

The above-described control unit is a component that is basically provided in the numerical control machine, the specification information of the numerical control machine can already be input, and the command is given using this information.

For example, when a point on which the shaft supporter 20 is installed is input to the controller, when the nut block 21 is moved to approach the shaft support 20, the controller knows to enter a predetermined area. When the nut block 21 enters the inside, the above-mentioned electronically controlled direction switching valve 100 is switched to change the direction of supply and exhaust of air pressure.

Hereinafter, the operation of the feed system of the numerical control machine according to the first and second embodiments of the present invention will be described with reference to FIGS. 3, 8 to 11, and 16 to 19.

First, the operation of the numerical control machine according to the first embodiment of the present invention will be described first.

As the ball screw 12 rotates clockwise or counterclockwise, the nut block 21 is linearly moved leftward or rightward and the nutblock 21 passes through the shaft supporter 20.

In addition, when the nut block 21 does not interfere with the shaft supporter 20, as shown in Figs. 8 and 9, the lifting shaft 60 is kept up and the first and second idlers with a predetermined pressing force. The rollers 92a and 92b remain in close contact with the ball screw 12 and the ball screw 12 is smoothly rotated.

When the nut block 21 passes through the shaft supporter 20, the plurality of first and second cam guides 25a and 25b come into contact with the plurality of first and second cam rollers 85a and 85b. Further progress of the nut block 21 causes the lifting shaft 60 to descend as shown in FIGS. 10 and 11.

That is, the first and second cam rollers 85a and 85b are inclined while the first and second cam guides 25a and 25b are in contact with the first and second cam rollers 85a and 85b. The lower portion rolls along the portion 28, thereby lowering the entire lifting shaft 60.

As described above, as the lifting shaft 60 descends, the above-described first and second idle rollers 92a and 92b have a space to be separated from the ball screw 12 and the above-described nut block 21 through the space. ) Will pass.

Immediately after the nut block 21 passes through the shaft supporter 20, the elevating shaft 60 is raised so that the first and second idle rollers 92a and 92b are in close contact with the ball screw 12 and the ball screw 12 Supported).

Therefore, the transfer system according to the first embodiment of the present invention is a lifting and lowering of the lifting shaft 60 in a mechanical structure by the cam action.

On the other hand, when pressurized by pressurizing means such as supply of air pressure, the nozzle part 63 described above is in close contact with the taper portion 36 of the plug 35, but the first and second cam guides 25a are closed. The nozzle part 63 is opened at the moment when the lifting shaft 60 is pressed by 25b, and the air pressure is exhausted between the open gaps.

As described above, a rod is not applied to the inside of the cylinder 30 at the moment the air pressure is exhausted, whereby the piston 61 of the lifting shaft 60 can be easily lowered by the cam action as an idle state.

In addition, when the nut block 21 passes through the shaft supporter 20 and the first and second cam guides 25a and 25b no longer press the first and second cam rollers, the piston 61 described above is It may rise by the restoring force of the compression spring 75, and may also be raised by the air pressure supplied through the second port 51.

Since the air pressure supplied through the second port 51 described above is lower in cross section of the piston 61 than the cross section of the nozzle part 63, the pneumatic pressure can be pushed up in the direction in which the lifting shaft 60 is raised. If the part 63 ascends as much as possible, the nozzle part 63 is blocked by the tapered portion 36 of the plug 35.

That is, in the transfer system according to the first embodiment of the present invention described above, when the shaft supporter 20 descends, the nut block 21 is not connected to the shaft supporter 20 by a mechanical action without an external command or artificial manipulation. It is possible to drive without causing interference.

Hereinafter, the operation of the transfer system according to the second embodiment of the present invention will be described with reference to FIGS. 16 to 19.

16 and 17, the transfer system according to the second embodiment of the present invention is initially raised in such a manner that the shaft supporter 20 comes into close contact with the ball screw 12. As shown in FIG.

That is, the piston 61 is raised by the compression spring 75 or a pressurizing means such as air pressure, thereby raising the entire lifting shaft 60, and the first and second idle rollers (1, 2) installed on the upper end of the lifting shaft 60 ( 92a and 92b are in close contact with the surface of the ball screw 12, and the plurality of first and second idle rollers 92a and 92b described above are rotated in accordance with the rotation of the ball screw 12 so that the ball screw ( 12) is supported.

Then, when the nut block 21 is moved to approach the shaft supporter 20, a command is generated from the controller to operate the electronic control direction switching valve 100.

In the vicinity of the shaft supporter 20, a falling section may be set as shown in FIGS. 17 and 19, and this falling section may be input to the controller.

The above-mentioned electronically controlled directional valve 100 is to change the direction of supply and exhaust of the air pressure and the technique of the electronically controlled directional valve 100 uses a known technique and a detailed description thereof will be omitted.

As described above, when the nut block 21 approaches the shaft supporter 20, the air pressure is blocked from being supplied through the second port 51. On the contrary, the air pressure is supplied through the first port 31, resulting in the lifting. The shaft 60 is lowered.

That is, as the lifting shaft 60 descends, the first and second idle rollers 92a and 92b are spaced apart from the ball screw 12 so that the nut block 21 passes through the secured space. do.

When the nut block 21 is separated from the shaft supporter 20 and goes out of the lowering section, the controller switches the electronic control direction switching valve 100 described above to block supply of air pressure through the first port 31, and Air pressure is supplied through the two ports 51 to raise and lower the lifting shaft 60.

That is, after the nut block 21 passes, the lifting shaft 60 rises, thereby supporting the ball screw 12 by the first and second idle rollers 92a and 92b.

The transfer system according to the second embodiment of the present invention as described above is to control the lifting of the lifting shaft 60 in response to a command from the control unit of the numerical control machine.

As described above, the feed system according to the first and second embodiments of the present invention can be supported in the middle of the long ball screw 12 to increase the rotational speed of the ball screw 12 and thereby It is possible to transfer the feed rate faster.

In addition, the deflection of the ball screw 12 can be significantly reduced by supporting the ball screw 12 in the middle.

The deflection of the above-described ball screw 12 will be described in more detail.

[Table 1] and [Table 2] below are the tables measured by simulating the conditions of fixing left and right in an axis having a diameter of 100 mm and a length of 10,000 mm.

As shown in Table 2, it can be seen that about 15.7 mm occurs due to its own weight.

Table 3 mentioned above is set to support one point of a ball screw and tested by a simulator. As shown in Table 3, it can be seen that the amount of deflection of the ball screw is reduced to 0.984 mm.

Table 4 described above is set to support two points on the ball screw and tested by a simulator. As shown in Table 4, the deflection amount of the ball screw decreases to 0.131 mm.

As shown in Tables 2 to 4 above, the longer the length of the ball screw 12 is, the more the deflection of the ball screw 12 occurs, but the more the ball screw 12 is supported at various points, The amount of deflection can be significantly reduced.

That is, the conveying system according to the first and second embodiments of the present invention can support the ball screw 12 by the shaft support 20, which can prevent sag of the ball screw 12, thereby transferring the feed more stably. The system can be operated.

On the other hand, as shown in FIG. 2, the shorter the distance between the points supporting the shaft, the faster the rotational speed can be realized. The transfer system according to the first and second embodiments of the present invention is provided on the shaft support 20. By being able to support the ball screw 12, it is possible to drive the rotational speed of the ball screw 12 more quickly to improve the performance of the feed system.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is represented by the following detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

The conveying system according to the first and second embodiments of the present invention can be used for rapidly conveying a tool post or a table in a numerically controlled machine.

1 is an exemplary view for explaining an example of a numerically controlled machine.

2 is a graph showing the correlation between the axis length and the allowable rotational speed.

3 is a plan view illustrating a transfer system of the numerical control machine according to the first embodiment of the present invention.

4 is an exemplary cross-sectional view taken along line X-X of FIG. 3.

5 is an exemplary view showing an extract of the feed system of the numerical control machine according to the first embodiment of the present invention.

6 and 7 are exemplary views and partial cross-sectional views showing an extract of the supporter from the feed system of the numerical control machine according to the first embodiment of the present invention.

8 to 11 are exemplary views for explaining the operation of the feed system of the numerical control machine according to the first embodiment of the present invention, Figures 8 and 9 is an exemplary view showing a raised state of the supporter, Figure 10 and 11 is an exemplary view showing a down state of the supporter.

12 is an exemplary cross-sectional view for explaining the feed system of the numerical control machine according to the second embodiment of the present invention in the X-X ray cross section of FIG.

13 is an exemplary view showing an extract of the feed system of the numerical control machine according to the second embodiment of the present invention.

14 and 15 are exemplary views and partial cross-sectional views showing an extract of the supporter from the feed system of the numerical control machine according to the second embodiment of the present invention.

16 to 19 are exemplary views for explaining the operation of the feed system of the numerical control machine according to the second embodiment of the present invention, Figures 16 and 17 is an exemplary view showing a raised state of the supporter, Figure 18 and 19 is an exemplary view showing a down state of the supporter.

(Explanation of symbols for the main parts of the drawing)

1: numerical control machine 2: feed meter

3: conveying body 3a: table

11: servo motor

12: ball screw 13: housing

14: Nutblock 15: Frame

20: shaft supporter 21: nut block

22: trimming part 23: nut member

25a, 25b: 1st, 2nd cam guide 27: binding piece

28: cam inclined portion

30: cylinder 31: first port

32: first fastener 35: plug

36: taper 40: collar

50: cylinder cap 51: second port

60: lifting shaft 61: piston

62: piston shaft 63: nozzle parts

64: Slit 65: First Pivot Boss

68: pivot shaft 70: guide pin

75: compression spring 80: supporter

81: Insertion 82: Second Pivot Boss

83a, 83b: 1st, 2nd side wall 85a, 85b: 1st, 2nd, cam roller

90: V block

92a, 92b: first and second idler rollers

100: electronically controlled directional valve

Claims (8)

A ball screw 12 installed in the frame 15 and rotated by the drive of the servomotor 11; A nut block 21 for binding the nut member 23 and the conveying body 3 screwed to the ball screw 12 to linearly move the conveying body 3; A plurality of first and second idle rollers 92a and 92b are installed on one side of the frame 15, and the plurality of first and second idle rollers 92a and 92b are mounted on the ball screw. A shaft supporter 20 which supports 12; And Descending driving means for lowering the shaft supporter 20 when the nut block 21 passes through the shaft supporter 20 such that the nut block 21 and the shaft supporter 20 do not collide; Feeding system of the numerical control machine comprising a. The method of claim 1, The shaft supporter 20 is provided with a plurality, the transfer system of the numerical control machine. The method of claim 1, The shaft supporter 20, A cylinder (30) installed on one side of the frame (15); An elevating shaft 60 disposed in the center of the cylinder 30 to elevate; A compression spring 75 installed inside the cylinder 30 and applying a restoring force in a direction in which the lifting shaft 60 is pushed up; And A plurality of first and second idle rollers (92a) (92b) disposed on an upper end of the elevating shaft (60) and supported by the ball screw (12) to rotate in contact with the ball screw (12); Feeding system of the numerical control machine comprising a. The method of claim 3, wherein The lifting shaft 60, A supporter (80) installed at an upper end thereof so as to be inclined in a left and right direction by a pivot shaft (68) and having the plurality of first and second idle rollers (92a) (92b) installed thereon; Feeding system of the numerical control processing machine further comprising. The method of claim 1, Further comprising a pressing means for pressing the lifting shaft 60 in the rising direction, The pressing means, The cylinder 30 has first and second ports 31 and 51 formed on the upper side and the lower side, respectively, based on the piston 61 of the lifting shaft 60. The air pressure is supplied to the second port (51) formed on the lower side and pressurizing in the direction of raising the lifting shaft (60); transfer system of a numerical control machine. The method of claim 1, The lower driving means, The cam inclined portion 28 is formed on one side of the nut block 21 or the conveying body 3, and the horizontal section has a first length formed longer than the length of the nut block 21. Second cam guides 25a and 25b; A lifting shaft 60 shot by the compression spring 68 in the cylinder 30; And A plurality of first and second cam rollers 85a and 85b installed on both sides of the upper and lower ends of the elevating shaft 60 to contact the plurality of first and second cam guides 25a and 25b, respectively. and, When the first and second cam guides 25a and 25b and the plurality of first and second cam rollers 85a and 85b come into contact with each other, the lifting shaft 60 is lowered by cam driving. When the first and second cam guides 25a and 25b are out of the plurality of first and second cam rollers 85a and 85b, the lifting shaft 60 is lifted by the restoring force of the compression spring 65. Feeding system of the numerical control machine, characterized in that. The method of claim 6, The cylinder 30 has first and second ports 31 and 51 formed on the upper side and the lower side, respectively, based on the piston 61 of the lifting shaft 60. The nozzle part 63 is installed to penetrate the piston 61 to the lifting shaft 60, The plug 35 is installed at a position corresponding to the nozzle part 63 above the cylinder 30, When the lifting shaft 60 is raised, the nozzle part 63 is closed by the plug 35, and when the lifting shaft 60 is lowered, the nozzle part 63 is opened to close the piston 61. The upper and lower pressures being the same; Feeding system of the numerical control machine, characterized in that. The method of claim 1, The lower driving means, A cylinder 30 having first and second ports 31 and 51 formed at upper and lower sides thereof, respectively; A lifting shaft (60) installed inside the cylinder (30) and rising or falling by air pressure provided to the first and second ports (31) (51); And When the nut block 21 enters an area adjacent to the shaft supporter 20, the controller controls the electronic shaft to lower the lifting shaft 60 by supplying air pressure to the first port 31 by a command from the controller. Divert valve 100; Feeding system of the numerical control machine comprising a.

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