Rotary tool

Abstract

To provide a rotary tool that is configured so that attachment and detachment of a cutting tool can be performed using an inexpensive work tool for fixing a spindle of the rotary tool, while enabling the attachment and detachment of the cutting tool to be performed using one spanner-like work tool that is used conventionally.SOLUTION: The rotary tool comprises: a spindle which has a nut for fastening a cutting tool arranged at a tip thereof and a tool engagement groove formed on an outer periphery thereof; a transmission shaft that has, at one end thereof, a parallel key that engages with a rail groove in a turret and transmits power to the spindle; and a housing member in which the spindle and the transmission shaft are stored, which further comprises an attachment / detachment base part member, mounted on an outer surface of the housing member, which is provided with a mounting part on which a tool that engages with the tool engagement groove can be mounted. The mounting part is mounted on a position where phases of the parallel key and the tool engagement groove match with each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This invention relates to a rotary tool (tool holder) used in a turret lathe that can use the rotary tool, and more particularly to a rotary tool having a cutting tool attachment / detachment structure that fixes the rotation of the spindle of the rotary tool when operating a clamping nut of a collet chuck that grips the cutting tool. [Background technology]

[0002] Conventionally, a rotary tool mounted on a lathe turret has a spindle in its housing and a tool clamping nut at the tip of the spindle. Specifically, the tool shank is inserted into the tip of the spindle, and when the tool clamping nut is turned in the tightening direction, the collet contracts in diameter via the retainer, securing the tool. Conversely, when the tool clamping nut is turned in the loosening direction, the collet expands in diameter via the retainer, releasing the tool. In this way, the tool is fixed to or released from the spindle by turning the tool clamping nut clockwise or counterclockwise.

[0003] Blades are replaced as needed, and various methods for this replacement have been known in the past. For example, this can be done by using two wrench-like tools to engage the blade clamping nut with the spindle, and then rotating the blade clamping nut in the tightening or loosening direction while fixing the tool engaged with the spindle. It is also known to fasten the blade using the structure described in the following patent document.

[0004] The tool for attaching and detaching a blade described in Patent Document 1 is a tool for attaching and detaching a blade that prevents a spindle having a blade-clamping nut at its tip from rotating in a desired direction relative to a housing of a tool holder. It is equipped with an inner ring that has a through-hole for the blade-clamping nut in the center and can engage with the spindle from either the front or back in a rotation-preventing state, an outer ring that is rotatably held by the inner ring, a stopper provided on the outer ring so that the outer ring abuts against the housing regardless of whether the outer ring rotates clockwise or counterclockwise on the inner ring, and a one-way clutch provided between the inner and outer rings.

[0005] By using this tool, even in a narrow space near the turret of a lathe, the tool can be easily inserted to secure the spindle, and then the tool can be clamped or unclamped by simply turning the tool clamping nut with a tool such as a wrench. Switching between unclamping and clamping operations can be achieved simply by flipping the tool and attaching it to the spindle, making tool replacement quick and easy. Furthermore, if the tool holder drive unit uses a parallel key, even if the tool is replaced while the parallel key is in the rail groove out of the drive position, the spindle is fixed to the tool holder housing and the tool clamping nut is turned with a tool such as a wrench, so the parallel key is not pressed forcefully against the rail groove, thereby protecting the rail groove from damage.

[0006] The tool holder described in Patent Document 2 comprises a spindle having a tool tightening nut and a tool engagement groove at its tip, a transmission shaft having a parallel key at one end that fits into a rail groove in a machine tool and extending in a direction intersecting the spindle, and a driving side and a driven side bevel gear that mesh with each other and are respectively attached to the other end of the transmission shaft and the spindle via a key and a key groove, and in the tool holder in which the spindle, the transmission shaft and the bevel gear are housed in a housing, the parallel key and the driving side bevel gear are attached to the transmission shaft and the driving side bevel gear. A driving bevel gear fixing key groove is formed so that the teeth or tooth grooves of the driving bevel gear have a fixed phase relationship, and a driven bevel gear fixing key groove is formed on the spindle and the driven bevel gear so that the tool engagement groove and the tooth groove or tooth of the driven bevel gear have a fixed phase relationship, so that the driving bevel gear and the driven bevel gear are engaged with each other in a fixed phase relationship, and a fixture that fits into the tool engagement groove of the spindle with the parallel key oriented in a predetermined direction is removably attached to the housing.

[0007] With this type of tool holder, the tool engagement groove of the spindle remains stationary at a fixed position relative to the housing so that its positional relationship can always be confirmed, and by fitting a fixture into the tool engagement groove of this stationary spindle and attaching this fixture to a fixed position on the housing, the spindle can be fixed so that it does not rotate relative to the housing. Therefore, when attaching or detaching a cutting tool, the cutting tool clamping nut can be tightened or loosened with just a tool such as a wrench, making the work of attaching or detaching a cutting tool simple and quick. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 4700436 [Patent Document 2] Utility Model Registration No. 3127357 Summary of the Invention [Problem to be solved by the invention]

[0009] However, using two tools to attach and detach blades is not only cumbersome but also requires a large work space, so there has been a demand for improving this workability. Also, although the blade attachment / detachment tool described in Patent Document 1 allows attachment and detachment of blades with a single tool, the blade attachment / detachment tool itself has a complex structure and is an expensive work tool, so it is not easily adopted.

[0010] Furthermore, the tool holder described in Patent Document 2 is configured such that the gear phase is precisely manufactured or the parts are adjustable so that when the parallel key on the end of the rotary tool drive shaft is oriented in a predetermined direction, the groove that engages with the power tool to fix the rotation of the spindle stops in a fixed position, but it takes a great deal of time and effort to manufacture the gear phase precisely and to assemble the tool holder while appropriately adjusting this phase, which is a factor in the high cost of such tool holders.

[0011] The present invention aims to solve these problems and to provide a rotary tool that allows cutting tools to be attached and detached using an inexpensive power tool for fixing the spindle of the rotary tool, while still allowing cutting tools to be attached and detached using a single wrench-shaped power tool that is conventionally used. [Means for solving the problem]

[0012] In order to solve the above problems, the rotary tool of the present invention includes a spindle having a tool tightening nut at its tip and a tool engagement groove on its outer periphery, a transmission shaft having a parallel key at one end that engages with a rail groove in a turret and that transmits power to the spindle, and a housing member that accommodates the spindle and the transmission shaft, and further includes a detachable base member that is attached to the outer surface of the housing member and has an attachment portion to which a tool that engages with the tool engagement groove can be attached, and the attachment portion is attached at a position where the parallel key and the tool engagement groove are aligned in phase.

[0013] In the rotary tool according to the present invention, it is preferable that the attachment portion is formed on the detachable base member at a predetermined position after the detachable base member is attached to the housing member.

[0014] In addition, in the rotary tool according to the present invention, it is preferable that the spindle is attached to a bearing holder member that is attached to the housing member, and the detachable base member is arranged along a side edge of the bearing holder member.

[0015] In addition, in the rotary tool according to the present invention, it is preferable that the detachable base member is adjusted and attached via a fastening means inserted into an elongated hole formed in a detachable base member attachment portion formed in the housing member.

[0016] Furthermore, in the rotary tool according to the present invention, it is preferable that the detachable base member has a step portion in which the long hole has a step in the insertion direction of the fastening means relative to the mounting portion, and the surface of the step portion is inclined symmetrically with respect to the surface of the mounting portion.

[0017] In addition, in the rotary tool according to the present invention, it is preferable that four tool engagement grooves are formed at approximately equal intervals on the outer periphery of the spindle, and the tool has an engagement claw portion that engages with two adjacent tool engagement grooves, and an attachment protrusion that can be inserted into the attachment portion.

[0018] Furthermore, in the rotary tool according to the present invention, it is preferable that the detachable base member has a detachable base main body that is attached to the housing member so as to be able to swing, and that the mounting portion is erected from the detachable base main body and has a mounting portion wall portion that can abut against the side surface of the tool.

[0019] In the rotary tool according to the present invention, it is preferable that the detachable base member is a pin member attached to the housing member, and the attachment portion is a side wall surface of the pin member.

[0020] In addition, in the rotary tool according to the present invention, it is preferable that two tool engagement grooves are formed axially symmetrically on the outer periphery of the spindle, and the tool is a plate-like member that can be inserted between one of the tool engagement grooves and the mounting portion.

[0021] In the rotary tool according to the present invention, it is preferable that at least one side surface of the tool that abuts against the tool engagement groove or the attachment portion is inclined with respect to the extending direction of the tool. [Effects of the Invention]

[0022] According to the present invention, a detachable base member is provided which is attached to the outer surface of a housing member and which has an attachment portion to which a tool can be attached that engages with the tool engagement groove, and the attachment portion is attached at a position where the parallel key and the tool engagement groove are aligned in phase, so that when a cutting tool is attached to or detached from the rotary tool, the rotation of the spindle is fixed by the tool that engages with the tool engagement groove, and the cutting tool can be easily attached or detached by rotating the tool tightening nut with a conventionally known wrench-like tool. Furthermore, since the detachable base member and the attachment portion are arranged so that the attachment portion is positioned at a position where the parallel key and the tool engagement groove are aligned in phase, bevel gears and the like within the housing can be assembled with a certain degree of phase alignment, and the attachment portion is ultimately positioned at a position where these phases are aligned, thereby reducing the manufacturing cost of the rotary tool. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view of a turret equipped with a rotary tool according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of a rotary tool according to a first embodiment of the present invention; [Figure 3] 1 is a cross-sectional view of a rotary tool according to a first embodiment of the present invention. [Figure 4] 1 is a perspective view of a detachable base member used in a rotary tool according to a first embodiment of the present invention; [Figure 5] 1 is a perspective view of a tool attached to a rotary tool according to a first embodiment of the present invention. [Figure 6] 3A to 3C are diagrams illustrating a cutting tool attaching / detaching process for the rotary tool according to the first embodiment of the present invention. [Figure 7] 3A to 3C are diagrams illustrating a cutting tool attaching / detaching process for the rotary tool according to the first embodiment of the present invention. [Figure 8] 3A to 3C are views showing a phase adjustment operation of the rotary tool according to the first embodiment of the present invention. [Figure 9] FIG. 6 is a perspective view showing a rotary tool according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a detachable base member used in a rotary tool according to a second embodiment of the present invention. [Figure 11]FIG. 10 is a perspective view of a rotary tool according to a third embodiment of the present invention. [Figure 12] FIG. 10 is a side view of a detachable base member used in a rotary tool according to a third embodiment of the present invention. [Figure 13] FIG. 10 is a perspective view of a rotary tool according to a fourth embodiment of the present invention. [Figure 14] FIG. 10 is a perspective view of a detachable base member used in a rotary tool according to a fourth embodiment of the present invention. [Figure 15] FIG. 10 is a front view of a tool attached to a rotary tool according to a fourth embodiment of the present invention. [Figure 16] 10A to 10C are diagrams illustrating a cutting tool attaching / detaching process for a rotary tool according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Preferred embodiments for carrying out the present invention will be described below with reference to the drawings. Note that the following embodiments do not limit the inventions according to the claims, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0025] [First embodiment] FIG. 1 is a perspective view of a turret equipped with a rotary tool according to an embodiment of the present invention, FIG. 2 is a perspective view of a rotary tool according to a first embodiment of the present invention, FIG. 3 is a cross-sectional view of the rotary tool according to the first embodiment of the present invention, FIG. 4 is a perspective view of a detachable base member used in the rotary tool according to the first embodiment of the present invention, FIG. 5 is a perspective view of a tool attached to the rotary tool according to the first embodiment of the present invention, FIG. 6 is a diagram for explaining the process of attaching and detaching a cutting tool to the rotary tool according to the first embodiment of the present invention, FIG. 7 is a diagram for explaining the process of attaching and detaching a cutting tool to the rotary tool according to the first embodiment of the present invention, and FIG. 8 is a diagram showing the phase alignment operation of the rotary tool according to the first embodiment of the present invention.

[0026] As shown in Fig. 1, a rotary tool 10 according to this embodiment is attached to a tool attachment portion 3 of a swivel-type turret 1 for use. A plurality of rotary tools 10 can be attached to the turret 1, and the cutting tool to be used can be switched by rotating the turret 1. The turret 1 is provided with a concentrically arranged annular rail 2, and a groove 2a formed in the annular rail 2 engages with a parallel key 17a, which will be described later.

[0027] 2, the rotary tool 10 includes a housing member 11, a bearing holder 12 attached to the front surface of the housing member 11, a spindle 13 rotatably mounted on a bearing (not shown) fixed inside the housing member 11 by the bearing holder 12, and a tool clamping nut 14. A collet 15 and a retainer 16 are mounted on the inner periphery of the tool clamping nut 14. The spindle 13, tool clamping nut 14, collet 15, and retainer 16 are arranged approximately coaxially on the spindle 13.

[0028] Furthermore, a detachable base member 20 is attached to the outer surface of the housing member 11, and is disposed adjacent to the bearing hold-down member 12. The detachable base member 20 is perforated with hole-like attachment portions 21. The detachable base member 20 is a rectangular plate-like member, and is preferably disposed along the edge of the bearing hold-down member 12.

[0029] The housing member 11 is also formed with an insertion portion 18 that protrudes in a direction perpendicular to the spindle 13, and the insertion portion 18 is inserted into the tool attachment portion 3 of the turret 1 to assemble the turret 1 and the rotary tool 10. The assembly method is by fixing with a fixing mechanism for each turret 1, such as fixing with a bolt (not shown). Furthermore, a transmission shaft 17 is rotatably assembled to the insertion portion 18, and one end of the transmission shaft 17 is formed with a parallel key 17a.

[0030] As shown in FIG. 3 , the rotary tool 10 includes a transmission shaft 17 that receives power from the lathe and a spindle 13 to which power is transmitted from the transmission shaft 17. The transmission shaft 17 and the spindle 13 are arranged so that their centerlines intersect at right angles, and are rotatably supported in the housing member 11 via bearings. One end of the transmission shaft 17 protrudes outside the housing member 11 through an insertion portion 18, which is formed with a parallel key 17a that connects to a drive shaft on the lathe side (not shown). A first bevel gear 18a is fixed to the other end of the transmission shaft 17 that is inserted into the housing member 11. One end of the spindle 13 protrudes outside the housing member 11, which is provided with a chuck for attaching and detaching a cutting tool (not shown). A second bevel gear 13b that meshes with the first bevel gear 18a is fixed to the portion of the spindle 13 that is inserted into the housing member 11.

[0031] A parallel key 17a on one end of the transmission shaft 17 slidably fits into a groove 2a of an annular rail 2 fixed to the frame side of the lathe inside the turret 1. When the turret rotates, the rotary tool 10 moves together with the other rotary tools 10, and the parallel key 17a of each rotary tool 10 slides in the groove 2a of the annular rail 2. The annular rail 2 is interrupted in the drive position, and the parallel key 17a of the desired rotary tool 10 disengages from the groove 2a of the annular rail 2 and is connected to a drive shaft (not shown) on the lathe side. When the drive shaft rotates, the rotation is transmitted from the transmission shaft 17 to the spindle 13, and a cutting tool held in a chuck of the spindle 13 machines the workpiece.

[0032] The chuck has a collet 15 housed in a cavity of the spindle 13, a retainer 16 that fits over the tapered surface of the tip of the collet 15, and a tool clamping nut 14 that fits over the retainer 16 and collet 15, is ball-connected to the retainer 16, and is screwed onto the collet 15. When the shank of a tool (not shown) is inserted into the collet 15 from the tip of the spindle 13 and the tool clamping nut 14 is turned in the tightening direction, the diameter of the collet 15 contracts via the retainer 16, tightening and fixing the shank of the tool (clamping). Conversely, when the tool clamping nut 14 is turned in the loosening direction, the collet 15 is released from the retainer 16 and expands in diameter, loosening and releasing the shank of the tool (unclamping).

[0033] In this way, by turning the tool clamping nut 14 clockwise or counterclockwise, the tool is clamped to or unclamped from the chuck of the spindle 13. A tool 30 and a wrench 34, which will be described later, are used for this clamping and unclamping operation. Tool engagement grooves 13a are formed on the outer periphery of the spindle 13 at predetermined intervals (approximately 90° in the case of the rotary tool 10 according to this embodiment), and spanner engagement grooves 14a, into which a wrench engages, are formed on the outer periphery of the tool clamping nut 14 at predetermined intervals.

[0034] As shown in Figure 4, the detachable base member 20 is formed by attaching a detachable base main body 20', which does not have a through-hole as the attachment portion 21, to the housing member 11 via a fastening hole 22 as shown in Figure 4(a), and drilling the attachment portion 21 at a position where the parallel key 17a and the tool engagement groove 13a are aligned in phase as shown in Figures 4(b) and 8.

[0035] 5, the mounting protrusion 32 of the tool 30 is assembled to the tool 30. The tool 30 is formed with a pair of engaging claws 31 formed at a predetermined interval (90° in the case of the rotary tool 10 according to this embodiment), and as shown in FIG. 6, when the mounting protrusion 32 is attached to the mounting portion 21, the engaging claws 31 can engage with any two adjacent positions of the tool engaging grooves 13a formed on the outer periphery of the spindle 13, thereby fixing the rotation of the spindle 13.

[0036] As shown in Figure 7, when the tool 30 is attached to the housing member 11, the engagement claw portion 31 of the tool 30 engages with the tool engagement groove 13a of the spindle 13 to prevent the rotation of the spindle 13, so that the tool can be unclamped and clamped by rotating the tool tightening nut 14 with a wrench 34.

[0037] The cutting tool held in the chuck of the rotary tool 10 is replaced with another cutting tool as needed, and when replacing the cutting tool, the cutting tool is unclamped and clamped with the rotary tool 10 removed from the turret 1, or the cutting tool may be unclamped and clamped while the rotary tool 10 remains attached to the turret 1.

[0038] The attachment portion 21 formed on the detachable base member 20 of the rotary tool 10 according to this embodiment is formed at a position where the parallel key 17a and the tool engagement groove 13a are aligned in phase.

[0039] That is, in the rotary tool 10 according to this embodiment, when the transmission shaft 17 and the spindle 13 are assembled into the housing member 11, the parallel key 17a formed on the end of the transmission shaft 17 is not precisely aligned with the tool engagement groove 13a formed on the outer periphery of the spindle 13, but rather the orientation of the parallel key 17a and the orientation of the tool engagement groove 13a are aligned visually. Assembling the components in this manner improves ease of assembly and reduces manufacturing costs by reducing the machining accuracy and assembly accuracy of the first bevel gear 18a and the second bevel gear 13b. However, because assembly is performed visually or due to variations in the machining phase of the gear fixing keyway relative to the teeth of the bevel gears, there is a possibility that the meshing between the first bevel gear 18a and the second bevel gear 13b may be misaligned by about one tooth.

[0040] 8, in the rotary tool 10 according to this embodiment, after the detachable base member 20 is attached to the housing member 11, the attachment portion 21 can be machined in a position where the engagement claw 31 of the tool 30 can engage with the tool engagement groove 13a formed in the spindle 13 with the parallel key 17a facing in a predetermined direction, thereby absorbing phase misalignment that occurs during assembly of the rotary tool 10 and reducing the manufacturing cost of the rotary tool 10. Furthermore, when attaching or detaching a cutting tool, the work can be performed using the tool 30 and a single wrench 34, and after clamping the cutting tool, machining on a lathe can be performed simply by removing the tool 30 from the detachable base member 20, thereby reducing the burden associated with the work of attaching or detaching a cutting tool.

[0041] [Second embodiment] In the rotary tool 10 according to the first embodiment described above, the mounting portion 21 is drilled by fitting the detachable base member 20 to the rotary tool 10a according to the second embodiment described below. The rotary tool 10a according to the second embodiment will be described as an example of a detachable base member having a different configuration from that of the first embodiment. Note that components that are the same as or similar to those in the first embodiment described above will be assigned the same reference numerals and will not be described again.

[0042] FIG. 9 is a perspective view showing a rotary tool according to a second embodiment of the present invention, and FIG. 10 is a perspective view of a detachable base member used in the rotary tool according to the second embodiment of the present invention.

[0043] 9, a detachable base member 20a is attached to the outer surface of the housing member 11 via a fastening means, and is positioned adjacent to the lower end of the bearing holder member 12a. The bearing holder member 12a is a plate-like member formed in a roughly rectangular shape, and has an arcuate edge 19 at the edge that comes into contact with the detachable base member 20a. It is preferable that the arcuate edge 19 be formed in an arcuate shape approximately coaxially with the spindle 13, which serves as the main shaft.

[0044] In this way, by forming the arc edge portion 19 on the bearing pressing member 12a, a relatively large space can be secured below the bearing pressing member 12a of the housing member 11, which not only ensures the mounting strength of the detachable base member 20a but also allows for greater freedom in the mounting position.

[0045] The detachable base member 20a is a plate-like member arranged along the lower edge of the bearing presser member 12a, and as shown in Figure 10, an arcuate wall portion 23 is formed so as to correspond to the arcuate edge portion 19 of the bearing presser member 12a. The detachable base member 20a also has a pair of arcuate elongated fastening holes 22a, 22a formed therein that correspond to the arcuate wall portion 23.

[0046] Furthermore, a through hole serving as the attachment portion 21a is formed between the pair of fastening holes 22a, 22a. The attachment portion 21a is preferably formed in a substantially central portion along the longitudinal direction of the detachable base member 20a. The attachment portion 21a is adapted to receive the attachment protrusion 32 of the tool 30, similar to the rotary tool 10 according to the first embodiment.

[0047] As shown in Figure 9, the rotary tool 10a of this embodiment configured as described above can be temporarily assembled to the housing member 11 by adjusting the attachment position of the detachable base member 20a along the arc edge portion 19 so that the attachment portion 21a can be positioned at a position where the engagement claw portion 31 of the tool 30 can engage with the tool engagement groove 13a formed in the spindle 13 with the parallel key 17a facing in a predetermined direction after which the attachment position of the detachable base member 20a can be adjusted along the arc edge portion 19. This makes it possible to reduce the manufacturing cost of the rotary tool 10a by absorbing phase misalignment that occurs during assembly of the rotary tool 10a.

[0048] Furthermore, when the mounting protrusion 32 of the tool 30 is attached to the mounting portion 21a, the engagement claw portion 31 of the tool 30 is fixed in a position where it engages with the tool engagement groove 13a of the spindle 13, so that when attaching or detaching the cutting tool, the work can be performed using the tool 30 and a single wrench 34. In addition, after the cutting tool has been clamped, machining can be performed on the lathe simply by removing the tool 30 from the detachable base member 20a, thereby reducing the burden associated with the work of attaching or detaching the cutting tool.

[0049] [Third embodiment] In the rotary tool 10a according to the second embodiment described above, the detachable base member 20a is formed in an arc shape, and the attachment portion 21a is positioned so that misalignment between the parallel key 17a and the tool engagement groove 13a can be absorbed. The rotary tool 10b according to the third embodiment, which will be described next, is an example of a detachable base member having a different configuration from that of the second embodiment. Note that components that are the same as or similar to those in the first and second embodiments are designated by the same reference numerals, and their description will be omitted.

[0050] FIG. 11 is a perspective view of a rotary tool according to a third embodiment of the present invention, and FIG. 12 is a side view of a detachable base member used in the rotary tool according to the third embodiment of the present invention.

[0051] As shown in FIG. 11 , the rotary tool 10b according to this embodiment, like the rotary tool 10a according to the second embodiment, has a configuration in which the attachment position of the detachable base member 20b can be moved circumferentially along the outer edge of the bearing holder member 12b. As shown in FIG. 11 , the rotary tool 10b according to this embodiment has a detachable base member 20b attached to the outer surface of the housing member 11 via a fastening mechanism, the detachable base member 20b being disposed adjacent to a lateral end of the bearing holder member 12b. The bearing holder member 12b is a plate-like member formed in a roughly rectangular shape, and has an arc-shaped edge portion 19 at its edge that contacts the detachable base member 20b. It is preferable that the arc-shaped edge portion 19 be formed in an arc-shaped manner approximately coaxially with the spindle 13. The arc-shaped edge portions 19 are formed on both the left and right ends, and the detachable base member 20b may be attached along either the left or right edge.

[0052] The detachable base member 20b is a plate-like member arranged along the side edge of the bearing presser member 12b, and has an arcuate wall portion formed to correspond to the arcuate edge portion 19 of the bearing presser member 12b. The detachable base member 20b also has a pair of arcuate elongated fastening holes 22b, 22b formed therein that correspond to the arcuate wall portion.

[0053] Furthermore, a through hole serving as the attachment portion 21b is formed between the pair of fastening holes 22b, 22b. The attachment portion 21b is preferably formed in a substantially central portion along the longitudinal direction of the detachable base member 20b. The attachment portion 21b is adapted to receive the attachment protrusion 32 of the tool 30, as in the rotary tool 10 according to the first embodiment.

[0054] 12 , when viewed in a direction perpendicular to the fastening direction of the fastening means, the detachable base member 20b has arc-shaped slots 22b, 22b formed as stepped portions 43, 43 that are stepped relative to the protrusion 44 on which the attachment portion 21b is formed, and the upper surfaces 42, 42 of the stepped portions 43 are inclined symmetrically with respect to the upper surfaces of the protrusions 44 (in the rotary tool 10b according to this embodiment, an upward slope of about 1 to 5°, more preferably about 2°). A bushing 41 through which the fastening means is inserted is attached to the stepped portion 43, and the bushing 41 is fitted into the groove of the arc-shaped slots 22b, 22b. Furthermore, a pressing slope corresponding to the slope formed on the upper surface 42 of the stepped portion 43 is formed. This, combined with the slope formed on the upper surface 42 of the stepped portion 43, restricts circumferential movement of the detachable base member 20b when the detachable base member 20b is attached to the housing member 11.

[0055] As shown in Figure 11, in the rotary tool 10b of this embodiment configured as described above, after the detachable base member 20b is temporarily assembled to the housing member 11, the attachment position of the detachable base member 20b can be adjusted along the arc edge portion 19 so that the attachment portion 21b can be positioned at a position where the engagement claw portion 31 of the tool 30 can engage with the tool engagement groove 13a formed in the spindle 13 with the parallel key 17a facing in a predetermined direction.This makes it possible to reduce the manufacturing cost of the rotary tool 10b by absorbing phase misalignment during assembly of the rotary tool 10b.

[0056] Furthermore, when the mounting protrusion 32 of the tool 30 is attached to the mounting portion 21b, the engagement claw portion 31 of the tool 30 is fixed in a position where it engages with the tool engagement groove 13a of the spindle 13. This means that when attaching or detaching the cutting tool, the work can be performed using the tool 30 and a single wrench 34. In addition, after the cutting tool has been clamped, machining can be performed on the lathe simply by removing the tool 30 from the detachable base member 20b, thereby reducing the burden associated with the work of attaching or detaching the cutting tool.

[0057] [Fourth embodiment] In the rotary tools 10, 10a, and 10b according to the first to third embodiments described above, a plurality of (e.g., four) tool engagement grooves 13a are formed at predetermined intervals (e.g., 90° intervals) on the outer periphery of the spindle 13, and the engagement claws 31 of the tool 30 engage with any two adjacent locations of the tool engagement grooves 13a to fix the rotation of the spindle 13. The rotary tool 10c according to the fourth embodiment, which will be described next, is an example of a detachable base member having a configuration different from that of the first to third embodiments. Note that components that are the same as or similar to those in the first to third embodiments described above are designated by the same reference numerals and will not be described again.

[0058] FIG. 13 is an oblique view of a rotary tool according to a fourth embodiment of the present invention, FIG. 14 is an oblique view of a detachable base member used in the rotary tool according to the fourth embodiment of the present invention, FIG. 15 is a front view of a tool attached to the rotary tool according to the fourth embodiment of the present invention, and FIG. 16 is a diagram for explaining the process of attaching and detaching a cutting tool to the rotary tool according to the fourth embodiment of the present invention.

[0059] As shown in Figure 13, the rotary tool 10c of this embodiment differs from the rotary tools 10, 10a, and 10b of the first to third embodiments in that the tool engagement grooves 13d formed on the outer periphery of the spindle 13b are formed on two surfaces axially symmetrically.

[0060] The detachable base member 20c is attached to the housing member 11 near the side edge of the bearing holder member 12 via a fastening means, and the detachable base member 20c is attached to the housing member 11 so as to be swingable.

[0061] 14, the detachable base member 20c has a detachable base member main body 51 having a generally diamond-shaped cross section, and a pair of mounting wall portions 52, 52 standing in the axial direction of the fastening means from the detachable base member main body 51. In the rotary tool 10c according to this embodiment, the mounting wall portions 52 function as the mounting portion.

[0062] As shown in Fig. 15, the tool 30a used to attach and detach the cutting tool of the rotary tool 10c according to this embodiment is a generally rectangular plate member, with a side surface 35 inclined relative to the longitudinal direction (extension direction). The thickness of the tool 30a is formed to allow it to engage with the tool engagement groove 13d. It is also preferable that an operation hole 36 or the like is formed in the tool 30a as needed. The operation hole 36 makes it easy to attach and detach the tool 30a, and when storing the tool 30a, the operation hole 36 can be hung on a hook or the like, allowing it to be stored in a tool storage shelf.

[0063] 16, in the rotary tool 10c according to this embodiment configured as described above, with the parallel key 17a facing a predetermined direction, the tool 30a is inserted between the spindle 13b and the detachable base member 20c so that the side surface 35 of the tool 30a engages with the tool engagement groove 13d formed in the spindle 13b. At this time, since the detachable base member 20c is assembled to the housing member 11 so as to be swingable, when the tool 30a is inserted so as to slide against the mounting wall portion 52, it rotates following the side surface 35 of the tool 30a. This rotation of the detachable base member 20c absorbs any phase misalignment that occurs during assembly of the rotary tool 10c, thereby reducing the manufacturing cost of the rotary tool 10c.

[0064] Furthermore, when the tool 30a is assembled between the mounting wall portion 52 and the tool engagement groove 13d, the position of the spindle 13b is fixed by the tool 30a, so that when attaching or detaching the blade, the work can be performed using the tool 30a and a single wrench 34. In addition, after the blade is clamped, processing can be performed simply by removing the tool 30a, which reduces the burden associated with the work of attaching or detaching the blade.

[0065] Furthermore, in the rotary tools 10, 10a, 10b, and 10c according to the first to fourth embodiments, even if the tool 30, 30a is lost, the tool engagement grooves 13a, 13d formed in the spindles 13, 13b remain the same as before, so that it is generally possible to attach and detach the cutting tool using two wrenches.

[0066] In the rotary tool 10c according to this embodiment, the mounting wall portion 52 is formed on the detachable base member 20c, and the detachable base member main body 51 is assembled to the housing member 11 so as to be able to swing freely. However, the detachable base member 20c may be configured as a pin member, and the spindle 13b may be fixed by the tool 30a swinging around the outer periphery of the pin member.

[0067] Furthermore, although the detachable base member 20c has been described as being attached to one side edge of the bearing presser member 12, the detachable base member 20c may also be assembled to both side edges of the bearing presser member 12 and fixed by inserting tools 30a into each of the tool engagement grooves 13d formed in the spindle 13b.

[0068] Furthermore, the rotary tools 10, 10a, 10b, and 10c according to the first to fourth embodiments have been described as having a cutting tool axis that is substantially parallel to the rotation axis direction of the turret 1, but the present invention may also be applied to rotary tools that use internal gears, such as speed-up and speed-down types, even if the cutting tool axis is parallel to the rotary tool drive axis direction (a cutting tool axis perpendicular to the turret mounting surface) or oblique to the drive axis direction. It is clear from the claims that such modified or improved embodiments are also included within the technical scope of the present invention. [Explanation of symbols]

[0069] 1 turret, 2 annular rail, 2a groove, 3 tool mounting portion, 10, 10a, 10b, 10c rotary tool, 11 housing member, 12, 12a, 12b bearing holder member, 13, 13b spindle, 13a, 13d tool engagement groove, 14 tool clamping nut, 15 collet, 16 retainer, 17 transmission shaft, 17a parallel key, 18 insertion portion, 19 arc edge portion, 20, 20a, 20b, 20c detachable base member, 21, 21a, 21b mounting portion, 22 fastening hole, 22a elongated hole, 23 arc wall portion, 30, 30a tool, 31 engagement claw portion, 32 mounting protrusion, 34 wrench, 35 Inclined portion, 36 operation hole, 41 bush, 42 upper surface, 43 step portion, 44 protrusion, 20', 51 detachable base body, 52 mounting wall portion.

Claims

1. a spindle having a tool clamping nut at its tip and a tool engagement groove on its outer periphery; a transmission shaft having a parallel key at one end that engages with a rail groove in the turret and that transmits power to the spindle; a housing member that accommodates the spindle and the transmission shaft, a detachable base member attached to an outer surface of the housing member and having an attachment portion to which a tool that engages with the tool engagement groove can be attached; The rotary tool, wherein the mounting portion is mounted at a position where the parallel key and the tool engagement groove are aligned in phase.

2. The rotary tool according to claim 1, The rotary tool according to claim 1, wherein the attachment portion is formed on the detachable base member at a predetermined position after the detachable base member is attached to the housing member.

3. The rotary tool according to claim 1, The rotary tool is characterized in that the spindle is attached to a bearing presser member attached to the housing member, and the detachable base member is arranged along a side edge of the bearing presser member.

4. The rotary tool according to claim 3, A rotary tool characterized in that the detachable base member is adjusted and attached via a fastening means inserted into an elongated hole formed in a detachable base member attachment portion formed in the housing member.

5. The rotary tool according to claim 4, The detachable base member has a step portion in which the long hole has a step with respect to the attachment portion in the insertion direction of the fastening means, A rotary tool, characterized in that the surface of the step portion is inclined symmetrically with respect to the surface of the mounting portion.

6. The rotary tool according to claim 1, The tool engagement grooves are formed in four approximately equally spaced locations on the outer periphery of the spindle, The rotary tool has an engaging claw portion that engages with two adjacent ones of the tool engaging grooves, and an attachment protrusion that can be inserted into the attachment portion.

7. The rotary tool according to claim 1, the detachable base member has a detachable base body attached to the housing member so as to be pivotable relative to the housing member; The rotary tool, characterized in that the mounting portion stands upright from the detachable base body and has a mounting portion wall portion that can abut against a side surface of the tool.

8. The rotary tool according to claim 1, the detachable base member is a pin member attached to the housing member; The rotary tool, wherein the attachment portion is a side wall surface of the pin member.

9. The rotary tool according to claim 7 or 8, Two tool engagement grooves are formed axially symmetrically on the outer periphery of the spindle, The rotary tool is characterized in that the tool is a plate-like member that can be inserted between one of the tool engagement grooves and the mounting portion.

10. The rotary tool according to claim 9, A rotary tool, characterized in that at least one side surface of the tool that abuts against the tool engagement groove or the attachment portion is inclined with respect to an extending direction of the tool.

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