JP2008200829A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool with a simple structure capable of improving machining efficiency. <P>SOLUTION: A plurality of spindles 19 are rotatably supported on a rotatable tool magazine 15. A drive transmitting shaft 14 corresponding to the spindle 19 is arranged in a rear of the tool magazine 15. A projecting connecting part 32 is formed on a distal end of the drive transmitting shaft 14, and a groove-like connected part 34 connectable with the connecting part 32 is formed in a base end of each spindle 19. The connected part 34 is extended in a circumferential direction around a rotational axis line of the tool magazine 15, and formed so as to be opened on both sides in a rotating direction of the tool magazine 15. A regulating mechanism 35 is provided so as to allow rotation of the spindle 19 in a condition that the connecting part 32 and the connected part 34 are coupled and to regulate the rotation of the spindle 19 in the other conditions. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a machine tool capable of continuously performing different kinds of machining on a workpiece by selectively using a plurality of rotary tools provided on a tool magazine.

Conventionally, as this kind of machine tool, the thing of a structure which is disclosed by patent document 1 and patent document 2 is proposed, for example.
In the machine tools described in Patent Document 1 and Patent Document 2, a tool holder supporting a plurality of tools is received on a tool magazine inclined with respect to the tool feed direction. Then, by rotation of the tool magazine, one of those tool holders is selected, and the selected tool holder is transferred from the tool magazine to the spindle and used for workpiece machining. In the machine tools disclosed in Patent Document 1 and Patent Document 2, the tool is transferred from the tool magazine onto the spindle and used for machining, but the tool is mounted on the tool magazine. For example, machine tools described in Patent Literature 3 and Patent Literature 4 are used in machining in a state.

  That is, in the conventional configuration described in Patent Document 3, a plurality of rotary tools are rotatably supported by the tool magazine, and a plurality of rotation transmission mechanisms for transmitting rotation to each of the rotary tools are provided. Yes. A rotating tool drive source having a drive motor and a main shaft is disposed behind the tool magazine. A clutch drive member is provided on the main shaft of the rotary tool drive source, and each individual rotation transmission mechanism is provided with a clutch driven member that can be engaged with and disengaged from the clutch drive member. When one rotary tool is selectively arranged at the machining position with respect to the workpiece by the indexing rotation of the tool magazine, one rotation transmission mechanism is arranged corresponding to the main shaft of the rotary tool drive source. In this state, the clutch drive member is engaged with the clutch driven member, whereby the rotation of the rotary tool drive source is transmitted to the rotary tool via the individual rotation transmission mechanism.

In the conventional configuration described in Patent Document 4, a plurality of rotary tools are rotatably supported by the tool magazine. A drive mechanism including a drive motor and a rotation transmission mechanism are disposed behind the tool magazine. A detachable first clutch is provided between the input side of the rotation transmission mechanism and the drive mechanism, and a detachable second clutch is provided between the output side of the rotation transmission mechanism and each rotary tool. It has been. Then, when one rotary tool is selectively arranged at the machining position for the workpiece by the index rotation of the tool magazine, the rotary tool is arranged at a position corresponding to the rotation transmission mechanism. In this state, when the rotation transmission mechanism is moved from the clutch non-coupled position, the first clutch and the second clutch are coupled, and the rotation of the drive mechanism is transmitted to the rotary tool via the rotation transmission mechanism.
JP-A-6-182646 JP 2005-28460 A Japanese Utility Model Publication No. 3-88612 JP-A-10-138015

  By the way, in the machine tools described in Patent Document 1 and Patent Document 2, a tool change mechanism for transferring a tool between the tool magazine and the spindle is necessary, and the configuration becomes complicated. In addition, since it takes time to transfer the tool holder between the tool magazine and the spindle, the total machining time becomes longer and the machining efficiency is lowered.

  In addition, in the machine tools described in Patent Document 1 and Patent Document 2, since the cone-shaped portion of the tool holder is fitted into the tapered hole of the spindle, the inner peripheral surface of the tapered hole and the cone The area of the outer peripheral surface of the part becomes large, and there is a possibility that foreign matters such as chips are caught between the inner peripheral surface and the outer peripheral surface. This foreign matter bites directly into processing accuracy. In order to prevent this, means for removing foreign matter has been embodied, but in particular, the means for removing foreign matter on the inner peripheral surface of the tapered hole has a complicated structure.

  Further, in the conventional configuration of Patent Document 3, the clutch composed of the clutch driving member and the clutch driven member is coupled by a meshing type or a friction type, so that the main shaft is moved forward and backward in the axial direction, and the clutch is moved. It was necessary to provide a clutch engagement / disengagement mechanism for engaging / disengaging. Therefore, the clutch engagement / disengagement mechanism becomes complicated. Moreover, in this Patent Document 3, it takes time to engage and disengage the clutch, and as in the case of the tool change in Patent Document 1 and Patent Document 2, a reduction in machining efficiency cannot be avoided.

  Further, in the conventional configuration of Patent Document 4, when the rotation transmission mechanism is moved, the first clutch between the drive mechanism and the rotation transmission mechanism and the second clutch between the rotation transmission mechanism and the rotation tool are engaged. It is configured to be removed. For this reason, the rotation transmission mechanism and the clutch engagement / disengagement mechanism are complicated. Also in Patent Document 4, it takes time to engage and disengage the clutch, and the processing efficiency is lowered.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a machine tool having a simple structure and capable of connecting a motor drive shaft to a main shaft only by indexing and rotating a tool magazine and improving machining efficiency.

  In order to achieve the above object, the present invention is capable of rotating around a moving member movable in a direction approaching and separating from a workpiece and an axis extending in the moving direction of the moving member on the moving member. A supported drive transmission shaft, a tool magazine supported on the moving member so as to be indexed and rotatable, and supported by the tool magazine so as to be rotatable, and selected by the index rotation of the tool magazine to a position corresponding to the drive transmission shaft. In a machine tool comprising a plurality of main shafts arranged in a row and positioning means for positioning the tool magazine in an indexed state in which each main shaft corresponds to a drive transmission shaft, formed at the tip of the drive transmission shaft A connecting portion, a connected portion formed at a base end portion of each of the main shafts and connected to the connecting portion by index rotation of the tool magazine, and the connecting portion and the connected portion One of them forms a convex portion having engaging surfaces on both sides, and the other has a groove shape that can slide relative to the engaging surface of this convex portion in the rotation direction of the tool magazine, The present invention is characterized in that there is provided a restricting means for permitting rotation of the main shaft in a connected state with the connected portion and restricting the rotation of the main shaft in other states.

  Therefore, in the machine tool of the present invention, when the tool magazine is indexed and rotated and one spindle is selectively arranged at the machining position corresponding to the workpiece, the base end of the spindle is arranged corresponding to the tip of the drive transmission shaft. Is done. At this time, the convex portion of the connecting portion on the drive transmission shaft side or the main shaft side enters and engages with the grooved connected portion on the main shaft side or the drive transmission shaft side, and the main shaft automatically connects to the drive transmission shaft. Is done. Thereafter, the rotation of the drive transmission shaft is transmitted to the main shaft by switching the main shaft from the rotation restricted state to the rotation permitted state by the restricting means. Therefore, unlike the conventional configuration, there is no need to provide a clutch engagement / disengagement mechanism for engaging / disengaging the clutch between the drive transmission shaft and the main shaft by moving the drive transmission shaft in the axial direction, thus simplifying the structure. be able to.

  In addition, since the drive transmission shaft and the main shaft, that is, the tool, can be connected and detached simply by indexing and rotating the tool magazine, no tool transfer operation or the like is required, and machining efficiency can be improved. It becomes.

  Further, among the plurality of main shafts supported on the tool magazine, the rotation of the other main shafts except for one main shaft selected and arranged at the machining position is restricted by the restricting means. For this reason, the groove-like connected portions formed at the base end portions of the main shafts are held in a state extending along the circumferential direction around the rotation axis of the tool magazine. Therefore, along with the indexing rotation of the tool magazine, the connecting portion on the drive transmission shaft side can be engaged with and disengaged from the connected portion on the main shaft side, and any one main shaft can be connected to the drive transmission shaft.

  In the above configuration, if the tool magazine is supported so as to be indexable and rotatable about an axis inclined with respect to the moving direction of the moving member, the plane area for installing the tool magazine is reduced, and the machine tool Can contribute to downsizing.

  Further, in the above configuration, a cylinder chamber to which coolant is supplied is provided at the shaft center of the drive transmission shaft, and the tip of the rod can be protruded from the tip of the drive transmission shaft in the cylinder chamber and is immersed by a spring. A piston biased in the direction is provided, and a first flow path communicating with the cylinder chamber is provided through the axial center of the piston. A second flow that can correspond to the first flow path is provided in each of the main shaft and the rotary tool. In the connected state between the connecting portion and the connected portion, the rod tip protrudes from the tip of the drive transmission shaft by the coolant pressure acting on the cylinder chamber, and the first flow path is It is good to comprise so that it may be connected to two flow paths.

  When configured in this way, when one spindle on the tool magazine is indexed and arranged at the machining position corresponding to the workpiece, and the spindle is connected to the drive transmission shaft via the connecting portion and the connected portion, The piston is moved by the coolant pressure, the tip of the rod projects from the tip of the drive transmission shaft, and the first flow path on the piston side and the second flow path on the main shaft side are connected. Therefore, when machining the workpiece by rotating the spindle, the coolant can be supplied from the tip of the rotary tool through both flow paths. Therefore, it is not necessary to provide a coolant supply mechanism corresponding to each main shaft, and the configuration is simplified.

  As described above, according to the present invention, the structure is simple and the processing efficiency can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3.
The machine tool of this embodiment is configured such that the workpiece W is placed on a workpiece base of a machine frame (not shown).

  In the machine frame, the moving member 11 such as a moving table moves in the tool feed direction, that is, the direction in which the moving member 11 approaches / separates from the workpiece W (the direction of the arrow P) and the direction orthogonal thereto (the direction orthogonal to the paper surface of FIGS. 1 and 2). ) Is supported to be movable. A drive motor 12 made of a servo motor is disposed on the side of the moving member 11 via a bracket 13, and the motor shaft 12a can rotate around an axis extending in the moving direction of the moving member 11 in the arrow P direction. A drive transmission shaft 14 is connected and fixed.

  An axis of the tool magazine 15 is inclined (45 degrees in this embodiment) with respect to the moving direction in a plane parallel to the moving direction of the moving member 11 in the arrow P direction. It is supported so that it can be indexed and rotated around the center. A plurality of spindle holders 16 are fixed to the outer peripheral edge of the tool magazine 15 at predetermined equal intervals along the circumferential direction around the rotation axis of the tool magazine 15, and a spindle 19 is attached to these spindle holders 16. It is supported rotatably about its own axis. A rotary tool 20 is detachably fitted to the tip of the main shaft 19.

  As shown in FIG. 1, an indexing motor 21 is disposed on the moving member 11 and is operatively connected to the tool magazine 15 via a speed reduction mechanism 22. When the tool magazine 15 is indexed and rotated by the indexing motor 21, an arbitrary main shaft 19 on the tool magazine 15 is selected and corresponds to the tip of the drive transmission shaft 14. In this state, the main shaft 19 is disposed at a position extending along the same axis as the rotation axis of the drive transmission shaft 14.

  A positioning mechanism 23 serving as positioning means is provided between the moving member 11 and the tool magazine 15. The positioning mechanism 23 is provided on the tool magazine 15 so as to correspond to each spindle 19 so as to correspond to a locking mechanism portion 24 provided on the moving member 11 side and to be able to be engaged with and disengaged from the locking mechanism portion 24. It is comprised from the several to-be-latched mechanism part 25 made. Then, when each spindle 19 is arranged at a position corresponding to the drive transmission shaft 14 with the indexing rotation of the tool magazine 15, the locking mechanism portion 24 of the positioning mechanism 23 is engaged with the locked mechanism portion 25. Then, as described in detail below, the tool magazine 15 is positioned and held in the indexed state.

  That is, in the locking mechanism portion 24 of the positioning mechanism 23, a cylindrical ball holder 27 is disposed at the distal end portion of the moving member 11 via the support plate 26, and the holding hole 27 a on the peripheral wall of the ball holder 27 is inserted into the holding hole 27 a. A plurality of balls 28 are held so as to be able to appear and retract with respect to the outside. A cylinder 29 is disposed on the support plate 26, and its piston rod 29 a protrudes into the ball holder 27. A switching member 30 is fixed to the piston rod 29a of the cylinder 29, and an inclined surface 30a for projecting the ball 28 and a concave groove 30b for allowing the ball 28 to enter are formed on the outer peripheral surface thereof.

  On the other hand, in each locked mechanism portion 25 of the positioning mechanism 23, a pair of locked members 31 are spaced apart from each other by a predetermined distance in the radial direction of the tool magazine 15 at a position corresponding to each spindle 19 on the tool magazine 15. And are arranged opposite to each other. Engaging grooves 31 a that can be engaged with and disengaged from the balls 28 of the locking mechanism portion 24 are formed on the inner surfaces of the locked members 31 facing each other.

  When each spindle 19 is arranged at a position corresponding to the drive transmission shaft 14 with the indexing rotation of the tool magazine 15, between the locked members 31 of the locked mechanism portion 25 corresponding to the spindle 19. The ball holder 27 of the locking mechanism portion 24 enters. In this state, when the cylinder 29 of the locking mechanism portion 24 is immersed, the ball 28 engages with the inclined surface 30a of the switching member 30 as shown by the solid line in FIG. And is engaged with the engaging groove 31a of the locked member 31. By this engagement, the tool magazine 15 is fixed in the indexed state and is positioned and held.

  At the tip end portion (the lower end portion in FIGS. 1 and 2) of the drive transmission shaft 14, a convex connecting portion 32 is formed as a convex portion having engaging surfaces 32a on both sides. A connected member 33 is fixed to the base end portion (the upper end portion in FIGS. 1 and 2) of each main shaft 19, and the tool magazine 15 is placed on the connected member 33 with respect to the engaging surface 32 a of the connecting portion 32. A groove-like connected portion 34 is formed that is slidable in the rotational direction. As shown in FIG. 3, the coupled portion 34 extends in an arc shape along the circumferential direction around the rotation axis of the tool magazine 15 and has a shape in which both sides in the rotation direction of the tool magazine 15 are opened. It has become. Further, the engaging surface 32 a of the connecting portion 32 is formed in an arc shape along the inner side surface 34 a of the connected portion 34. Then, when each main shaft 19 is arranged at a position corresponding to the drive transmission shaft 14 by the indexing rotation of the tool magazine 15, the engagement surface 32 a of the connection portion 32 of the drive transmission shaft 14 is connected to the connected portion 34 of the main shaft 19. It enters and is connected to the connected portion 34 while sliding relative to the inner side surface 34a. Both ends of the groove of the connected portion 34 and both ends of the engaging surface 32a of the connecting portion 32 avoid interference when the connecting portion 32 enters the connected portion 34, and introduce the connecting portion 32. Guide curved surfaces 32b and 34b for guiding the above are formed.

  When the drive motor 12 is stopped, the position of the drive motor 12 is controlled by a control device (not shown) so that the engaging surfaces 32a on both sides of the connecting portion 32 are along the circumferential direction around the rotation axis of the tool magazine 15. The

  As shown in FIGS. 1 and 2, a restriction mechanism 35 as a restricting means for restricting the rotation of the main shaft 19 is provided at a position corresponding to each main shaft 19 on the tool magazine 15. In other words, the cylinder 36 is disposed via the bracket 37 at a position corresponding to each spindle 19 on the tool magazine 15. A restricting member 38 is attached to the piston rod 36 a of each cylinder 36, and an engaging portion 38 a that can be engaged with the end edge of the connected member 33 on the main shaft 19 is formed at the tip of the restricting member 38.

  In the state where the connecting portion 32 of the drive transmission shaft 14 is connected to the connected portion 34 of the main shaft 19, the engaging portion 38 a of the regulating member 38 is brought about by the immersion operation of the cylinder 36 as shown by the solid line in FIG. 2. Is disengaged from the edge of the connected member 33 on the main shaft 19, and the rotation of the main shaft 19 is allowed. On the other hand, in other states, as shown by a chain line in FIG. 2, the engaging portion 38 a of the regulating member 38 is engaged with the edge of the coupled member 33 on the main shaft 19 by the protruding operation of the cylinder 36. The rotation of the main shaft 19 is restricted. Even when the coupled portion 34 of the main shaft 19 is detached from the coupling portion 32 of the drive transmission shaft 14 due to this rotation restriction, the extending direction of the groove of the coupled portion 34 is a circle centered on the rotational axis of the tool magazine 15. It is held in a state extending along the circumferential direction. That is, the main shaft 19 is fixed at the orientation position without rotating.

  A cylinder chamber 39 to which coolant is supplied is formed at the shaft center of the drive transmission shaft 14. A piston 40 is movably accommodated in the cylinder chamber 39, and the tip of the rod 40 a can protrude from the tip of the drive transmission shaft 14. A spring 41 is interposed between the piston 40 and the end of the cylinder chamber 39, and the piston 40 is urged by the spring 41 in the immersion direction of the rod 40a. A first flow path 42 communicating with the cylinder chamber 39 is provided through the axial center of the piston 40.

  Each of the main shaft 19 and the rotary tool 20 is provided with a second flow path 43 that can correspond to the first flow path 42. When the coolant pressure is applied to the cylinder chamber 39 in a state where the connecting portion 32 of the drive transmission shaft 14 is connected to the connected portion 34 of the main shaft 19, the piston 40 resists the biasing force of the spring 41 and protrudes. The tip of the rod 40 a protrudes from the tip of the drive transmission shaft 14, and the first flow path 42 is connected to the second flow path 43. In this state, when the workpiece W is processed by the rotation of the main shaft 19, coolant is supplied from the tip of the main shaft 19 to the processing portion through both the flow paths 42 and 43.

  As shown in FIG. 3, on the movement path of each spindle 19 accompanying the indexing rotation of the tool magazine 15, an air injection nozzle is disposed in the vicinity of the passing area of the connected portion 34. When the connected portion 34 of the main shaft 19 is moved at the disengagement position from the connecting portion 32 of the drive transmission shaft 14 by the indexing rotation of the tool magazine 15, the air injection nozzle 44 moves toward the connected portion 34. Air is injected, and foreign matters such as chips adhering to the connected portion 34 are removed by cleaning.

Next, the operation of the machine tool configured as described above will be described.
In the state shown in FIGS. 1 and 2, one main shaft 19 on the tool magazine 15 is indexed and arranged at a machining position corresponding to the drive transmission shaft 14, and the connected portion 34 of the main shaft 19 is connected to the drive transmission shaft 14. It is connected to the part 32. Further, the ball 28 of the locking mechanism portion 24 in the positioning mechanism 23 is engaged with the engagement groove 31a of the locked member 31 of the locked mechanism portion 25, and the tool magazine 15 is positioned and held in the indexed state. . Further, the regulating member 38 of the regulating mechanism 35 is detached from the edge of the coupled member 33 on the main shaft 19, and the rotation of the main shaft 19 is allowed. Moreover, the rod 40a of the piston 40 provided in the cylinder chamber 39 in the drive transmission shaft 14 projects from the tip of the drive transmission shaft 14, and the first flow path 42 in the piston 40 is the second flow path in the main shaft 19. 43.

  In this state, when the drive transmission shaft 14 is rotated by the drive motor 12, the rotation is transmitted to the main shaft 19 via the connecting portion 32 and the connected portion 34, and the main shaft 19 is rotationally driven. Then, as shown by a two-dot chain line in FIG. 1, when the moving member 11 is moved closer to the workpiece W, the drive motor 12 and the tool magazine 15 are moved together and connected to the drive transmission shaft 14. The workpiece W is subjected to predetermined processing such as drilling by the workpiece W. During processing of the workpiece W, coolant is supplied from the tip of the main shaft 19 through the first flow path 42 and the second flow path 43.

  When the machining by the rotary tool 20 is completed, the moving member 11 is returned to the solid line position in FIG. 1 separated from the workpiece W, and the rotation of the drive transmission shaft 14 by the drive motor 12 is stopped. In this state, as shown in FIG. 3, the extending direction of the groove of the coupled portion 34 of the coupled member 33 is positioned on the circumference centered on the center of the tool magazine 15. Next, as indicated by a chain line in FIG. 2, the restricting member 38 of the restricting mechanism 35 is engaged with the edge of the coupled member 33 on the main shaft 19 to restrict the rotation of the main shaft 19. At the same time, the ball 28 of the locking mechanism portion 24 in the positioning mechanism 23 is released from the engaging groove 31a of the locked member 31 of the locked mechanism portion 25, and the tool magazine 15 is released from the positioning holding state.

  Thereafter, when the tool magazine 15 is indexed and rotated by the indexing motor 21, the used main shaft 19 is separated from the machining position corresponding to the drive transmission shaft 14, and another main shaft 19 of a different type is driven to the drive transmission shaft. 14 is arranged at a processing position corresponding to 14. Therefore, the connected portion 34 of the used main shaft 19 is detached from the connecting portion 32 of the drive transmission shaft 14, and the connected portion 34 of another main shaft 19 is connected to the connecting portion 32 of the drive transmission shaft 14. .

  In this state, as in the case described above, the tool magazine 15 is positioned and held in the indexed state by the operation of the positioning mechanism 23, and the rotation of the main shaft 19 is allowed by the releasing operation of the restriction mechanism 35. The main shaft 19 is moved toward the workpiece W by the movement of the moving member 11 while being rotated by the drive transmission shaft 14, and the workpiece W is processed differently from the above case.

The machine tool according to this embodiment operated as described above has the following effects.
(1) When one main shaft 19 is selectively arranged at the machining position along with the index rotation of the tool magazine 15, the convex connecting portion 32 on the drive transmission shaft 14 side and the groove-like connected portion on the main shaft 19 side 34 is engaged, the main shaft 19 is connected to the drive transmission shaft 14, and the main shaft 19 connected so far is moved to the standby position. Therefore, a tool change mechanism for exchanging and moving the tool between the tool magazine and the drive transmission shaft, and a clutch between the drive transmission shaft and the main shaft are engaged and disengaged by moving the drive transmission shaft in the axial direction. It is not necessary to provide the clutch engagement / disengagement mechanism, and the structure can be simplified.

  (2) Tool change is performed only by indexing and rotating the tool magazine 15 for tool selection. Accordingly, it is not necessary to transfer the tool by the tool changing mechanism, or to operate the clutch engagement / disengagement mechanism, so that the time required for tool changing can be shortened and the machining efficiency can be improved.

  (3) Since the connection structure of the drive transmission shaft 14 and the main shaft 19 is a connection between the grooved connected portion 34 and the convex connecting portion 32, unlike the connection using a fastening member such as a coupling, The surface area of the connecting portion can be narrowed, and foreign matters such as chips are less likely to adhere to the connected portion 34 and the like. Further, even if foreign matter adheres, it can be easily removed by air blow or the like having a simple configuration. Accordingly, it is possible to always perform high-accuracy machining while avoiding a reduction in machining accuracy.

  (4) Among the plurality of main shafts 19 supported on the tool magazine 15, the other main shafts 19 except for one main shaft 19 selected and arranged at the machining position are restricted by the restriction mechanism 35. ing. For this reason, in the rotation-restricted main shaft 19, the groove-like connected portions 34 formed at the base end portions thereof do not cause a positional shift in the circumferential direction around the rotation axis of the tool magazine 15. It is held in a state extending along. Therefore, along with the indexing rotation of the tool magazine 15, the connecting portion 32 on the drive transmission shaft 14 side is appropriately engaged with and disengaged from the connected portion 34 on the main shaft 19 side, and any one main shaft 19 is connected to the drive transmission shaft 14. Can be linked.

  (5) When one main shaft 19 on the tool magazine 15 is indexed and arranged at the machining position and the main shaft 19 is connected to the drive transmission shaft 14 via the connecting portion 32 and the connected portion 34, the piston is driven by the coolant pressure. 40 is moved, the tip of the rod 40a protrudes from the tip of the drive transmission shaft 14, and the first flow path 42 on the piston 40 side and the second flow path 43 on the main shaft 19 side are connected. ing. Therefore, when processing the workpiece W by the rotation of the main shaft 19, the coolant can be supplied from the front end of the main shaft 19 through both the flow paths 42 and 43. Thus, since the coolant can be supplied via the drive transmission shaft 14, it is not necessary to provide a coolant supply mechanism for each main shaft 19, and the configuration can be simplified.

(Example of change)
In addition, this embodiment can also be changed and embodied as follows.
Contrary to the above-described embodiment, a groove-like connected portion extending along the circumference around the rotation center of the tool magazine 15 is provided on the drive transmission shaft 14 side, and a convex connecting portion is provided on the main shaft 19 side. thing.

The index rotation axis of the tool magazine 15 is made parallel to the axis of the drive transmission shaft 14 without tilting the tool magazine 15 with respect to the axis of the drive transmission shaft 14.
Provide cleaning means such as an air injection nozzle for removing foreign matters such as chips adhering to the connecting portion 32 at the tip of the drive transmission shaft 14.

  ・ Use other means such as a brush instead of the air injection nozzle to remove foreign matter such as chips.

The principal part sectional view showing the machine tool of one embodiment. The partial expanded sectional view of the machine tool of FIG. The fragmentary sectional view in the 3-3 line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Moving member, 12 ... Drive motor, 14 ... Drive transmission shaft, 15 ... Tool magazine, 16 ... Spindle holder, 19 ... Spindle, 20 ... Rotary tool, 21 ... Indexing motor, 23 ... Positioning mechanism as positioning means, 24 ... Locking mechanism part, 25 ... Locked mechanism part, 27 ... Ball holder, 28 ... Ball, 29 ... Cylinder, 30 ... Switching member, 31 ... Locked member, 32 ... Linking part, 33 ... Linked member , 34 ... connected portion, 34a ... engagement surface, 35 ... restriction mechanism as restriction means, 36 ... cylinder, 38 ... restriction member, 39 ... cylinder chamber, 40 ... piston, 40a ... rod, 41 ... spring, 42 ... 1st flow path, 43 ... 2nd flow path, W ... Workpiece | work.

Claims (3)

A movable member movable in a direction approaching or separating from the workpiece;
A drive transmission shaft that is rotatably supported about an axis extending in the moving direction of the moving member on the moving member;
A tool magazine supported on the moving member to be indexable and rotatable;
A plurality of spindles that are rotatably supported by the tool magazine and that are selectively arranged at positions corresponding to the drive transmission shaft by index rotation of the tool magazine;
In a machine tool comprising positioning means for positioning a tool magazine in an indexed state in which each spindle corresponds to a drive transmission shaft,
A connecting portion formed at the tip of the drive transmission shaft;
A connected portion that is formed at the base end portion of each main shaft and is connected to the connecting portion by index rotation of the tool magazine;
One of the connecting portion and the connected portion forms a convex portion having engaging surfaces on both sides, and the other has a groove shape that can slide relative to the engaging surface of the convex portion in the rotation direction of the tool magazine. What to do,
A machine tool, comprising: a restricting means for permitting rotation of the main shaft in a connected state between the connecting portion and the connected portion and for restricting rotation of the main shaft in other states. The machine tool according to claim 1, wherein the tool magazine is supported so as to be indexable and rotatable about an axis inclined with respect to a moving direction of the moving member. A cylinder chamber to which coolant is supplied is provided at the shaft center of the drive transmission shaft, and a piston in which the tip of the rod can protrude and retract from the tip of the drive transmission shaft and is urged in the immersion direction by a spring. A first flow path communicating with the cylinder chamber is formed through the piston shaft, and a second flow path corresponding to the first flow path is formed through each main shaft, The rod is protruded from the tip of the drive transmission shaft by the coolant pressure acting on the cylinder chamber in the connected state with the connected portion, and the first flow path is connected to the second flow path. The machine tool according to claim 1, wherein the machine tool is a machine tool.

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