TW200402344A - Spindle device - Google Patents

Abstract

In this invention, a blind hole is formed around a rotational axis of a spindle such that the hole is open at an end portion on a side opposite to a drill holding side. A center guide, having a plurality of air outlets of a journal air bearing at its outer periphery, is fitted in the blind hole so as to be supported by a case. Compressed air is blown off from the air outlet so as to support the spindle in a diameter direction from a center side. Mass of such structure of the spindle can be made smaller, so that no unstable phenomenon occurs even if the spindle is rotated at high speed with high natural frequency.

Description

200402344 V. Description of the invention (l) Field of the invention The present invention relates to a spindle device 'which includes a spindle having a tool holding device at one end and a gas bearing device which supports the spindle in a rotatable manner. Prior Art Fig. 5 is a sectional view showing a spindle device in a conventional printed circuit board punch. In the figure, a female push-out surface 11 is formed at a front end portion (lower end portion in the figure) of the main shaft 1 accommodated in the case 10. That is, the main shaft 1 has a bottomed hole 7 formed along the axial direction, and a center portion of the bottom surface of the bottomed hole 7 is formed with a through hole penetrating in the axial direction. In addition, the inner surface of this through-hole is the above-mentioned push-out surface It which is enlarged in diameter at the front end. A male push surface 21 having the same angle as the push surface 11 is formed on the outer periphery of the collet 2. The hole 4 which engages the drill (tool) 3 is extended in the axial direction and penetrated through the central portion of the collet 2. The collet 2 is provided with a plurality of cutting grooves (not shown) at equal angular intervals in the circumferential direction from the pushing surface 2t to the hole 4, and is guided through the inner periphery of the two-axis f-axis 1. The shaft and rod 5 are at the end side (the upper side of the purpose). The lever 5 is fixed and supported in the shape of being fitted into the center hole of the guide bushing 6. In the main

The bottom surface 7a of the bottomed hole 7 and the guide bushing car are contracted in such a manner as to bias upwards in the figure to firmly hold the collet 2 system. Thick rubbing force, 3 sides of the driller ^ are in close contact with the pushing surface lt, tube 2 elasticity =: by = closed, closed by the direction of the inside of the hole 4 and 1 of the surface of the driller 3

200402344 V. Description of the invention (2) Female ^ 2 axis 1 series includes a flange 1 f which is integrally formed from the side of the front side (lower side of the figure) and protrudes from the periphery A i +, and will be connected to the axis ^ Shape: I: ^ surface, and ladder-shaped copper material is connected to its two ends to form a ring-shaped titanium turning part (rotor) 9. f benefit 1 0 forms a hole that can be slidably and pivotally fitted to the main shaft i: in the central portion of the hole 11 in the axial direction, it expands in the outer diameter direction t, and the storage portion 11 b. A coil (fixer) 12 is disposed at a position 2 opposite to the rotating portion 9 in the storage portion 丨 丨 b. The coil 12 is connected to a provincial conversion power source. In the part facing the hole u in the box 10, the pore aperture-shaped journal gas 2 bearing the plural supply holes 13 is oriented in a radial direction, and is spaced in the direction of the axis 0 through the gap. The mode is set. The air supply holes 3 discharge the gas (here, compressed air) in a direction orthogonal to the axis 0, and two rows are arranged above and below the coil 12 as shown in the figure. Hereinafter, a journal gas bearing having three groups of air supply holes 13 arranged below the coil 12 is referred to as an air bearing A, and a journal gas having three groups of air supply holes arranged above the coil 12 is provided. The bearing is called an air bearing B. The air supply holes 13 are connected successively (connected to the first supply port 14). On the front end side (lower side of the figure) of the hole 11 is provided: a shaft accommodating portion that accommodates the front end side of the main shaft 1 in a slidable and retractable manner 丨 c And a ring-shaped recessed portion 丨 d formed so that the flange 1 f can be stored in the storage portion 1 1 c. A plurality of dagger holes are formed in the upper and lower opposite sides of the flange If in the ring-shaped recessed portion p in the year p. 15 is in the circumferential direction. The air supply directions of the plurality of air supply holes 15 are each directed to the axis 0 direction, and are provided so as to continue to the second supply port 16.

200402344

In thrust gas bearing c. One end (the upper end in the figure) of a push rod 20 is fixed to the double piston 22. -Heavy, the plug 2 2 series is configured in the configuration is placed in the box! 〇 inside the upper part of the one-cylinder heavy chamber 11a. The third and fourth supply ports 23 and 24 formed in the box 10 are connected to the chamber na, respectively. The spring 25 is for some reason. When the compressed air supplied to the supply port 24 is blocked, the piston 22 will be lowered to prevent the push rod 20 from contacting the rod 50. Next, the conventional spindle device having the above-mentioned structure will be described. Actions. Compressed air is supplied from the supply port 23 to lower the piston 22. In this way, when the piston 22 is lowered, the push rod 20 moves to the lower side of the figure and pushes the lever 5 to resist the biasing force of the disc spring 8 to move the collet 2 to the lower side of the figure. Therefore, when the pushing surface 21 of the collet 2 is removed from the pushing surface 丨 t, the force acting on the inner diameter direction of the collet 2 will disappear and the collet 2 will be opened, so in this state, μ can be drilled. The holder 3 is removed from the collet 2. Next, after inserting the other drill 3 into the collet 2, the compressed air supply to the supply port 23 can be stopped and the compressed air can be supplied to the supply port 24 to raise the piston 22. Then, when the push rod 20 moves to the upper part of the figure, the pushing surface 21 is crimped to the pushing surface by the biasing force of the disc spring 8. The collet 2 is closed, so the hole holder 3 is Hold firmly on the spindle 1. Next, 'supply compressed air to the supply port i 4 ,; [6. In this way, in addition to the function of the air bearings A and B, the main shaft 1 is supported in the radial direction in such a manner that its axis and the axis of the hole 0 are consistent, and at the same time, the function of the thrust gas bearing C is supported Supported in axis 0 direction. In this state, when a current is supplied to the coil 12, a magnetic field generated in the coil 12 will occur in the rotating portion 9 " back,

200402344 V. Description of the invention (4) Turning torque, main direction, direction, by drilling in recent years, large, in order to make the number of revolutions as large as possible, for the sake of mention. At this time, as well as shortening, the speed of the main shaft is shortened, and the space is shortened. If necessary, there is only one case. The reason is that there is a problem that the main shaft is rotated at a high speed and the rigidity of the shaft is low. SUMMARY OF THE INVENTION The present invention provides a spindle device,

211〇.5796-PF (Nl) .ptd Axis 1 will rotate. As a measure, the workpiece is processed by the mounting punch 3 (not shown). Move Yi10 to the axis 0 square. Minimum straightness below 0.1mm. Efficient processing is required to increase the efficiency of processing. In addition, the adopted hole ‘elevates the main shaft’ and improves the inherent vibration bearing of the main shaft: No, unique to gas bearings such as high-speed rotation of the main shaft and no movement! : = Free from the main shaft Natural vibration number of the South main shaft,: d: The two methods that can be considered are the method of reducing the thickness and the effective length. ~ · ^ Method of small outer diameter and size, reduction of the outer diameter of the main shaft, annual bearing stiffness (shaft ㈣m is stronger due to instability caused by μ bearing support): need to worry about making the main sleeve high gas bearings A, β For = ,,, when the length of the main axis of the button is configured, * * ', the distance between the rows of fluorine holes 1 3, or the right side; lice bearings A, B JL φ 疋 are used for the square of the air bearing, However, no matter what the problem occurs, the purpose of the present invention is to promote the main spoke device of the operation type, which can make the main way, and solve the problem: the shaft of the air bearing is solved In order to solve the above problems, the department in the above-mentioned conventional technology provides 200402344

Includes: support at one end in a rotatable manner is characterized in that: at the main, along the hollow part, a main shaft with a holding device, and a gas bearing device for the main shaft of the box member, the direction of the axis runs from the one end to the other end Forming the middle-body box = Yu: = The diameter of the guide rod member of the hollow part relative to the above-mentioned main axis 〜 The axial direction of ~ * is inserted into the upper part. Formed in the above-mentioned guide rod member 6

The gas from the corpus callosum; the gap between the second peripheral surface and the inner stomach surface of the above-mentioned main axis ^ * 拄 ,,;, the body exhaust hole, through which the gas is exhausted from the gas exhaust hole: supports the above-mentioned main axis in it Around. According to the present invention, by using a journal gas bearing provided with a gas discharge port, the spindle can be surely supported in the radial direction, the air bearing structure can be simplified, the overall length of the spindle can be shortened and lighter than conventional, and the spindle can be improved. Intrinsic f-momentum. In addition, without reducing the bearing rigidity of the air bearing, it is possible to improve the working efficiency while supporting the main shaft stably and rotating it at high speed. With this, miniaturization of the device can be achieved. In this case, it is effective when the guide member is integrally fixed to the box member.

It is also effective that the guide rod member is supported by the box member movably with respect to the axial direction of the main shaft, and is also constituted as a push rod obtained by operating the tool holding device. / 'Also' may be configured to have an inner peripheral surface formed on the box member,

200402344 V. Description of the invention (6) The inner peripheral surface and the outer peripheral surface of the main shaft discharge hole, the gas discharged from the gas: gap is mounted on the outer peripheral surface of the gas bearing to discharge gas to support the main shaft. The following structure is described. An enlarged ring box member is formed in the straight rear direction of the main shaft. The upper shaft accommodates the above-mentioned ring-shaped concave portion and the square-shaped concave portion. The main portion has a ring-shaped protruding portion protruding in a ring in the radial direction of the main shaft. The shaped surface is provided with a vent hole on both sides of the annular recessed portion with the annular skin y, and a gas sleeve in the axial direction is provided with a gas discharged from the space on the second surface. The gas discharged from the hole supports the above-mentioned main shaft. According to the present invention, the gas is provided on the outer peripheral surface of the guide rod member supported by the diameter-discharge hole (air supply hole) of at least the main shaft in the box member. Diameter, so the unnecessary journal gas bearing system definitely supports the main shaft to the bearing B (refer to the 5th longest picture \, the air length to be installed in the conventional main shaft device is equivalent to the province Huan j As a result, the length of the main shaft = lice bearing B can be increased because the total length of the main shaft is shortened, and the main shaft can be reduced in weight. Also, if the bearing rigidity is low, 'the spindle can be stabilized in a high state, and the conventional spindle dream bearing bearing rigidity can be omitted.' At this time, the air bearing A (see section Figure 5) The composition of seven red and eight e, compared to the configuration of the air bearing B, can shorten the length of Wang Hanyou's Wang Chang, and can be more like a 'main' car. Based on the graph τκήίι of the steam & example, illustrating this Out as follows. _

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Hi1 2110-5796-PF (Nl) .ptd 200402344 V. Description of the invention (7) (First embodiment) Fig. M: The cross section of the spindle device of the first embodiment of the invention f has the same structure as that of FIG. 5 Elements, elements (components) with the same function, and some shapes that are somewhat unprepared ^ 4 installed, such as eight, station 2 ^ J 1-elements (components) with the same function are given the same symbols and their descriptions are omitted. The spindle device in the present embodiment is included in the box u. The spindle (i.e., the lower end of FIG. 1) has a spindle i having a collet (tool holding unit) 2 and a box member. An air bearing device supporting this spindle i.

The box 10 is provided with a hole u along the axial direction (the up-down direction in the i-th figure). This hole 11 includes a double chamber Ua that houses a double piston 22, a coil housing portion 11b that houses the coil 12, a shaft housing portion 11c that accommodates the front end portion of the main shaft 1 in a slidable and rotatable manner, and a The method of turning accommodates the flange lf of the main body ^ and expands into a ring-shaped recessed portion 1 1 d with respect to the radial direction of the main shaft 丨. A segment portion 10a in the thrust direction is formed between the chamber 丨 a in the inside of the box 10 and the coil accommodating portion lib to hold the flange portion 30b of the center guide (the guide bar lever member) 30. The shaft housing portion Uc constitutes a gap between the outer peripheral surface of the spindle worker and the inner peripheral surface of the cassette 10.

The box 10 is further provided with communication paths 37a and 38a formed at different positions on the outer peripheral side of the coil storage section 丨 丨 b. The communication path 37a is in addition to the first supply port 14 which is passed through the outer peripheral surface of the box 10, and is also connected to the air supply hole 丨 3 provided on the lower side of the coil 12 through the communication path 37b. The communication path 38a communicates with the air supply hole 15 through the communication path 38b except for the second supply port i 6 which is penetrated through the outer peripheral surface of the case 10 '.

200402344 V. Description of the invention (8) The air supply holes 13 on the lower side of the J = i coil 12 are provided with a two-air bearing A of a journal gas bearing. That is, this allows ^ ^ ^ ^ ^ ^ ^ ^ to produce a human-like, η α This empty louse bearing A has an inner peripheral surface formed on the shaft housing portion 11c facing Yi 10, and in this inner periphery Surface and the main dagger: the air supply hole i 3 from which the gas is discharged from the space between the peripheral surfaces, and the oxygen I # discharged from the air supply holes 1 3 from this, the furnace finds the disorder and forms the support for the main shaft 1 on its outer peripheral surface. The gas supply holes 15 are provided in the thrust gas bearing C. The spindle device of this embodiment does not include the air bearing B of the conventional spindle device described in FIG. 5 through the air supply hole 13 disposed on the upper side of the coil 12. Stomach extraction

The main shaft 1 is provided with a bottomed hole (hollow portion) 7 formed along the axis (axis 0) from the one end (the lower end in FIG. 1) to the other end (the upper end in FIG. 丨). The spindle device is provided with a center guide 30 that extends in the axial direction of the spindle i and is passed through the bottomed hole 7. The above-mentioned gas bearing device that supports the spindle worker in a rotatable manner is provided with an air supply hole formed in an outer peripheral surface of the center guide 30 and discharging gas through a gap between the outer peripheral surface and the inner peripheral surface of the spindle 1. (Gas discharge hole) 33 supports the main shaft 1 on the inner peripheral surface thereof through the gas supply hole 33 discharged from this. ,body

The center guide 30 includes a shaft portion 30a formed along the axis of a hollow chamber 32, which will be described later, and the above-mentioned protrusion formed on the rear end side (upper end of the figure) of the shaft portion 30a. Edge 3 〇b. The center guide 3 0 is fitted to the bottomed hole 7 in a slidable and swiveling manner except that the axis is aligned with the year axis 0. At the same time, the flange portion 30b is integrally fixed to the box by being held on the segment portion 10a. That is, the center ^ 30 is integrally supported with respect to the radial direction and the axial direction of the main shaft 1.

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200402344 V. Description of the invention (9) The box 10 should be supported at the reference and position of the main shaft i of the journal gas bearing D described later. At both ends of the center guide 30, holes 31 are formed by penetrating the center portion through the axial direction $ and slidably engaging the push rods 20. The chamber 32 having a larger diameter than the hole 31 is located between the holes 31 and 31 in the shaft portion 30a. ^ On the outer peripheral surface of the center guide 30 with respect to the inner peripheral surface of the main shaft 1 having the bottomed hole 7, a plurality of air supply holes 33 having a pinhole-shaped journal gas bearing (gas bearing device) D are arranged. The rows (three rows shown) are in the direction of the axis 0, and a plurality of air supply holes 33 are arranged in each row in the circumferential direction. That is, on the outer peripheral surface of the shaft portion 30a of the center guide 30, the above-mentioned air supply holes 33 are penetrated and penetrated so as to communicate with the chamber 32. These air supply holes 33 are arranged at a substantially regular interval, and each of them serves as A group is provided in the axial direction of the shaft part 30. In addition, in each of the air supply hole groups, the air supply holes 33 are arranged at equal angular intervals in the circumferential direction of the shaft portion 30a. The bearing rigidity of the journal gas bearing D is not less than that of the air bearing B shown in Fig. 5. The pusher 20 includes a small diameter portion 20a, a large diameter portion 20b, a flange portion 20c provided below the large diameter portion 20b, a protruding portion 20d provided above the large diameter portion 20b, And the middle part from the whole is formed in the communication hole 34 on the upper side in the axial direction. The small-diameter portion 20a can be formed to slide in the same direction at both ends of the center guide 30 and to 32, and is almost the same as the hole 31 = diameter and smaller than the diameter of the chamber 32. The large-diameter portion 20b is formed as a small choke portion 20a # with a large diameter, and the flange portion 30b guided from the center protrudes upwards. It fits into the center of the piston 22 in a bone-movable manner. Hole 22a. The protruding portion 20d is formed so that the diameter of the larger diameter portion 20b is smaller, and the diameter

200402344 V. Description of the invention (ίο) The heart hole 2 2 a protrudes from above and protrudes from the center hole j 〇 b of the uppermost part of the box 10. One end of the through-hole 34 is connected to the chamber 32 through a hole 35 penetrating the middle portion of the pusher 20, and the other end 36 is connected to compressed air (not shown). source. The reference numeral 39 in the figure is a ring member fitted to the upper surface of the piston 22 and fitted to the protruding portion 20d. The pusher 20 having the above-mentioned structure is inserted into the center hole 22a of the piston 22 at the same time as the small-diameter portion 20a is inserted in the center of the shaft portion 30a, and the large-diameter portion 20b is also inserted in In a state where the protruding portion 20d protrudes from the center hole iQb of the box 10, the upward biasing force of the spring 25 retracted between the flange portion 20c and the flange portion 30b is received. The operation of this embodiment will be described below. That is, when the supply ports 14 and 16 and the end portions 36 of the communication holes 34 of the pusher 20 are each supplied with compressed air, the compressed air supplied from the end portions 36 passes through the portion held by the segment portion 10a. The flange portion 30b is ejected from the air supply hole 33 which guides 30 and is fixed to and supported by the center of the box 10 to form a journal gas bearing D. Therefore, the main shaft 1 located on the outer peripheral side of the center guide 30 is supported in the radial direction from the center shaft. In the air bearing A system, as in the conventional case shown in Fig. 5, the main shaft 1 is supported from the outside in the radial direction. Therefore, with the journal gas bearing D and the air bearing A, the axis line and axis 0 of the rotation of the main shaft i are uniform, and are well supported in the radial direction. The thrust gas bearing C is the same as in the conventional case, and supports the main shaft 1 in the state. In this state, a current is supplied to the coil 12 to rotate the main shaft 1. Furthermore, the box 10 is moved in the direction of the axis 0 (upper and lower directions in the figure) by a device (not shown), and a workpiece (not shown) is processed by the drill 3.

2H〇-5796-PF (Nl) .ptd Page 13 200402344 V. Description of the invention (li) '---- Center Ϊ 般: Generally, in the embodiment of the present invention, the 配置Is the journal pinched by the air supply hole 33 red? D series can be attached to the main shaft 1 &_; _ _ Shenjing bore body bearing, inside, and support the main shaft 1 stably and stably; ^ # It is necessary to install in the conventional main shaft device. Figure 5 ®, 丨 open two empty louse axes (quoted). Furthermore, shortening all 4 of the main shaft 1 by the conventional method is equivalent to omitting the length of the outer & upper seal printed on the old King's 1 air bearing B, and the main shaft 1 can be made lighter (wall quality) to increase the number of natural vibrations. . Therefore, it does not make the air axis = main 1 ^ 1 of it. The low rigidity of the bearing allows the spindle to rotate at a high speed in a stable state. Because compared with the conventional structure of the spindle, even if the maximum rotation J is set higher, it will not cause instability. = Workability. _ Again, in this embodiment, there is a gas supply hole (gas discharge hole) 1 3 formed in the inner peripheral surface of the box, and the space between the inner peripheral surface and the outer peripheral surface of the spindle 1 is used to discharge gas. Because there is an air bearing (gas bearing device) A that supports the main shaft 1 on the outer peripheral surface by the gas discharged from the air supply hole 3, the above-mentioned journal bearing gas bearing D can be added by the air bearing a. Supports the spindle 1 stably. In this embodiment, the annular recessed portion 11 d obtained by accommodating the flange (annular projection) f is provided in the case 10. Further, the flange 1f is formed on the main shaft 1 so as to be housed in the annular recessed portion 11d, so as to protrude in a ring shape 4 with respect to the radial direction of the main shaft 1. In addition, a gas supply hole (gas discharge hole) 15 is formed on both side surfaces of the annular recessed portion 11 d and discharges gas in a gap between the two side surfaces of the flange 1 f. The gas supply hole 1 is provided therefrom. 5 The exhaust gas supports the main shaft 1 in the axial direction.

2110-5796-PF (Nl) .ptd p. 14 200402344

V. Description of the invention (12) Set) C ° Therefore, the journal shaft gas bearing J) and air bearing A can be stably supported in the radial direction of the main shaft 1 and the thrust gas bearing c can be stably supported. In the direction of axis 0. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 2. This figure is a cross-sectional view of the spindle device of this embodiment. Compared with the previous embodiment shown in Figure j, this embodiment differs only in that the center guide 3 〇 and the pusher 2 〇_ are formed into a body, and the other parts are almost the same, so it has the same structure as the first embodiment. Figures and Figure 5 have the same components, components (components) that have the same function, and elements (components) that have slightly different shapes but have the same function are given the same symbols and their descriptions are omitted. That is, between the chamber 11 a and the coil accommodating portion 丨 b in the inside of the box 10, a small warp dagger 1 0 d fixed in a state where the cylindrical guide member 40 is fitted, and A segment portion 10c formed on the lower side of the small-diameter portion 10d. The guide member 40 has an inner diameter 'approximately' of the outer diameter of the central guide 3 of this embodiment, so as to be fixed (that is, fixed to the box 10). The center guide 30 of the small-diameter portion 1 Od in which the guide is slidably inserted is in the axis 0 direction (the up-down direction in FIG. 2). In this embodiment, the center guide 30 includes the shaft portion 30a having the same outer diameter as the center portion 30 of the center guide 30 shown in FIG. 1, the shaft ^ shaft 3 0 c, and the shaft portion 3 formed therein. 〇c is an insertion portion 30d in the upper portion of the pusher 20 and having a large diameter portion 20b of the pusher 20 which has almost the same outside diameter, and a flange portion provided between the shaft portion 30c and the insertion portion 30d. 30 ′ and two ′ from the center hole 22a of the piston 22 protruding above and from the box 10 ′

^ tL

200402344

5. Description of the invention (13) 10b is a protrusion 30f which is smaller than the diameter of the insertion portion 30 (1). Moreover, the center guide 30 is restricted and sandwiched by the flange portion 30e and the ring. The relative movement of the piston 22 formed by the member 3 g is substantially fixed to the piston 22. This center guide 30 includes a chamber 32 formed so as to extend in the center portion along the axial center direction, and a plurality of chambers 32. The rows (three rows shown) are arranged in the direction of the axis 0 and constitute the air supply holes 33 of the journal gas bearing D, and the pressing protrusions protruding from the lower side and pushing down the rod 5 and the guide bush β. The above-mentioned air supply holes 3 and 3 are arranged in the columns arranged in the direction of the axis 0, and a plurality of circumferential directions of the center guide 30 are arranged in the form of an isosceles portal.

As shown above, the center guide 30 in this embodiment also describes the function of the putter 20 in the first embodiment. However, due to the structure of other parts in the above-mentioned manner, and the action system in this embodiment, The above embodiments are substantially the same, and repeated descriptions are omitted. According to this embodiment, in addition to obtaining the function of a 2 ° pusher by making the center guide as in the second embodiment described above,? = Compared to the first column, a simpler structure of the device can also be obtained (苐3 embodiment) FIG. 3 is a diagram related to a third embodiment of the present invention, and has the same structure as that of M ′ to FIG. 5; == this element (constituent), and the shape is somewhat different ,,, -The same symbols are assigned to ίίΛΛ and their descriptions are omitted. The main shaft device in the Zhan Chang ’shaft installation is different from the main a shown in Figure 1 in that the air shaft is not set at this point,

2110-5796-PF (Nl) .Ptd

200402344 V. Description of the invention (14) The flange 1 f is arranged on the opposite side (upper side in FIG. 3) of the flood (tool holding portion) 2 and the moving point of the piston 22A constituted by the piston 22 in one (one weight) manner . Therefore, the air supply holes 5 (gas exhaust holes) provided at the lower side in FIG. 1 are arranged at positions opposite to the flanges f in the central portion of the box 10. When the bearing gas rigidity of the journal gas bearing D is very large, as shown in FIG. 3, “the air bearing A provided with the spindle device of FIG. 1 is not necessary,” so that the spindle can be shortened compared to FIG. 1. The full length of 1 is lighter. 0 The flange 1 f is arranged on the opposite side of the collet 2 at the front end of the main shaft 1, so that the center of gravity of the main shaft 1 can be located near the center of the axis 0 direction. The axis collapse of the main shaft 1 is more effectively prevented. Further, since the piston is constituted by a single piston 22A, it can be simply constructed, and the spindle device can be made more lightweight. As described above, the main shaft device in this embodiment has a number of differences from the main shaft device shown in FIG. 1. However, due to the structure of the other parts described above and the operation of this embodiment, The above embodiments are the same, so duplicate descriptions are omitted. (Fourth Embodiment) Figure 4 is related to this figure.

........... a ... The main season of the example of steam is composed of section 1 with the same components as those in Figures ^ and 5 and has the same elements (components). , And shapes that are somewhat different but have the same elements and components) are given the same symbols and their descriptions are omitted. The spindle device in this embodiment is different from the one shown in FIG. 1.

2110-5796-PF (Nl) .ptd Page 17 200402344 Five 'invention description (15), the device is: the air bearing A is not provided, at the front end of the main shaft, the collet (tool holding part) 2 The opposite side (upper side of FIG. 4) is provided with a flange 1 ^ = point, and a centr if ugal chuck using centrifugal force is used. This tool holding device uses this point. At first, the above-mentioned chuck using centrifugal force (for example, refer to US Patent No. 5,997, 223) is used to hold the rotation of the holding member of the tool and keep the main shaft rotating to use the above-mentioned holding structure; the centrifugal side of the cattle = When loading or unloading the tool, reduce the number of revolutions of the spindle to relieve force. Therefore, in the first figure, in order to eliminate the need for the piston 22 of the driving device for the tool attachment and the push rod 20, the number of components of the main shaft 1 can be reduced and the device can be made lighter. . It can be subtracted from the above. The embodiments are described based on the embodiments. The embodiments are examples and are not limited objects. 7 f is the meaning of the present invention, which is indicated by the scope of the attached patent application, and the scope of L ^ 丄 is not restricted to the description of the embodiment. Moreover, it belongs to the scope of the invention that is within the scope of patent application. Han owed to Wang Ben

200402344 Brief Description of Drawings Fig. 1 is a sectional view of a spindle device according to a first embodiment of the present invention. Fig. 2 is a sectional view of a spindle device according to a second embodiment of the present invention. Fig. 3 is a sectional view of a spindle device according to a third embodiment of the present invention. Fig. 4 is a sectional view of a spindle device according to a fourth embodiment of the present invention. Fig. 5 is a sectional view of a conventional spindle device. DESCRIPTION OF SYMBOLS 1 spindle, 3 drills, 6 guide bushings, 8 disc springs, 10 boxes, 12 coils, 20 push rods, 20b large diameter section, 30 center guides, 3 4 communication holes, 40 guides Component, 11, 2t pushing surface, 10c segment part, 30c shaft part. 2 collets, 5 rods, 7 holes with a bottom (hollow part) 9 rotating parts, 11 holes, 1 3, 1 5, 3 3 air supply holes, 2 0 a small diameter part, 22, 22A piston, 32 chamber, 3 9 connecting member, D journal gas bearing, 1 f flange, 1 0 b center 孑 L,

I 1

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Claims (1)

I — a kind of main shaft device, main Zhuo 4, — dagger has a gas bearing at one end only 士 tool holding device; and ^ Yu Yi members support Gu Hai in a rotatable manner. Its characteristics are: The above-mentioned main shaft is formed along the test axis direction from the end of the main shaft to the other end in the above-mentioned containing member,-the body support #, extending from: "the guide member of the hollow part of the main shaft in the radial direction of the main shaft; The axis of the track main axis is inserted through the above-mentioned gas bearing assembly w & 'the outer peripheral surface, and the gas discharged from the * gas formed on the guide rod member at this outer surface: surface: = inside of the shaft The gap between the peripheral surfaces supports the above-mentioned main axis. Z is exhausted from the gas exhaust hole. 2 As the patent application scope of the first guide rod member is — the 4th king of Ji Youyue, where the above T It is fixed to the above box member .: The spindle device as described in item [Scope of patent application], = The dry member moves relative to the axial direction of the above spindle: the above-mentioned rod. It also serves as a pusher for moving the tool holding device. 4 · Rushen The scope of the patent includes any one of items 3 to 3, and further includes a gas bearing device having a shape: a shaft-mounted peripheral surface, and between the inner peripheral surface and the outer peripheral surface of the above-mentioned main shaft = two, The gas discharge hole of the gas, which is discharged from the gas discharge hole = row] Page 20 2110-5796-PF (Nl) .ptd 200402344 6. Application scope of patent Hold the above-mentioned main axis on its outer peripheral surface. 5. If applying for a patent The spindle device according to any one of the items 1 to 4, wherein the box member is formed with an annular recessed portion that is enlarged in a ring shape with respect to the radial direction of the spindle; and the spindle is configured to accommodate the annular recessed portion. A ring-shaped protrusion projecting in a ring shape with respect to the radial direction of the main shaft is provided; and a gas bearing device is further provided, which is formed on both sides of the ring-shaped recess and on both sides of the ring-shaped protrusion. A gas discharge hole through which the gas is discharged from the gap, and the gas discharged from the gas discharge hole supports the main shaft in the axial direction. 2110-5796-PF (Nl) .ptd Page 21