Multi-axis angle head device with automatic angle adjustment, for machine tool

Abstract

The present invention relates to a multi-axis angle head device with automatic angle adjustment, for a machine tool, the device having an improved structure such that the angle of an angle head, required for manufacturing various products, can be automatically adjusted without manual operation, wherein a main shaft coupling means operates such that a main shaft and a rotating body are selectively coupled and rotate relative to each other, a rotation restraint release means operates such that a fixed body and the rotating body are selectively coupled and rotate relative to each other, and electrical signals are transmitted to a motor that is the driving source for the main shaft, thus automatically rotating the main shaft and smoothly adjusting the angle of a toolhead as required, thereby eliminating the inconvenience of requiring personnel to remain on standby at work sites to adjust the angle of the toolhead, and thus saving labor costs, and as the angle of the toolhead can be precisely and automatically adjusted, operational precision and work efficiency due to automation can be improved.

Description

Automatic angle-adjustable multi-axis angle head device for machine tools

[0001] The present invention relates to a multi-axis angle head device for a machine tool capable of automatic angle adjustment, and more specifically, to a multi-axis angle head device for a machine tool capable of automatic angle adjustment with an improved structure so that the angle of the angle head required for processing various products can be automatically adjusted without manual work.

[0002] There are various types of machine tools essential to the machinery industry, and depending on the classification criteria, they can be divided into general-purpose machine tools and specialized machine tools. General-purpose machine tools are capable of performing various machining operations with a single machine and include lathes, milling machines, and drilling machines. In contrast, specialized machine tools are equipment capable of performing only one type of machining, and they are applied to mass production lines to improve productivity.

[0003] Meanwhile, machining centers and milling machines are equipped with a spindle in which a tool is clamped and fixed. With the tool fixed, the spindle rotates at high speed by rotational force transmitted from a motor, enabling the tool to perform cutting operations on the workpiece.

[0004] There are various types of tools fixed to the spindle, including angle heads. An angle head is a piece of equipment used when the rotation axis of the spindle and the rotation axis of the tool are different, for example, when the rotation axis of the tool must have a certain angle with respect to the rotation axis of the spindle. By applying such an angle head, holes that are inclined with respect to the axial direction of the spindle can be easily machined.

[0005] In order to solve the problems of angle head devices according to the prior art, the applicant developed the 'multi-axis angle head device for machine tools' disclosed in Patent No. 10-2434409. However, recognizing the need to develop a high-quality, multi-functional angle head device through additional functional improvements, the present invention was devised.

[0006] That is, according to the invention disclosed in Patent No. 10-2434409, it has the advantage of enabling rapid and efficient work by having multiple tool mounting parts so that tools required for work can be mounted and used at once, thus eliminating the need to change tools, and the advantage of being able to accurately deliver cutting fluid to the cutting point and easily control the supply and shut-off of cutting fluid by having a nozzle part that sprays cutting fluid placed on all tool mounting parts. However, since the angle head is configured to be adjusted manually, it is not possible to smoothly adjust the angle of the angle head required for processing various products, and there was the inconvenience of having to always have personnel stationed around the device.

[0007] - Prior art literature

[0008] (Patent Document 1) Korean Published Patent Application No. 10-2017-0020111 (Vibration prevention device for angle head)

[0009] (Patent Document 2) Korean Registered Patent Publication No. 10-0996031 (Spindle Attachment Device for Machine Tool)

[0010] (Patent Document 3) Korean Registered Patent Publication No. 10-1791073 (Post-processor for 5-axis machining using an angle head spindle)

[0011] (Patent Document 4) Korean Registered Patent Publication No. 10-2434409 (Multi-axis angle head device for machine tools)

[0012] Accordingly, the present invention has been devised to solve the above-mentioned problems and aims to provide a multi-axis angle head device for a machine tool capable of automatic angle adjustment, which enables the angle of the angle head required during processing of various products to be automatically adjusted without manual work.

[0013] A multi-axis angle head device for a machine tool capable of automatic angle adjustment according to the present invention for achieving the above objective comprises: a collet chuck that receives rotational force from the main spindle of the machine tool (which rotates along a unidirectional axis for part processing) and rotates axially; a fixed body positioned at the lower part of the collet chuck while supported by the machine tool; and a rotating body disposed at the lower part of the fixed body in a manner that surrounds the main spindle and is coupled to the fixed body so as to be rotatable relative to it, wherein rotational and fixed (non-rotatable state) operations relative to the fixed body are selectively performed according to the driving of a rotational restraint release means including a rotational restraint cylinder device. The device is characterized by comprising: a tool head coupled to the rotating body to rotate together with the rotating body and rotating together with the main body, wherein a plurality of tool mounting portions are formed on the outer surface in a manner that surrounds the main shaft and are arranged radially at the same angle, and a plurality of bevel gears are rotatably installed in the internal space to transmit the rotational power of the main shaft to the tool side mounted on each tool mounting portion; and a tool head that allows relative rotation of the main shaft or rotates together with the main shaft according to the driving of a main shaft linkage means including a cylinder device for main shaft linkage.

[0014] The above rotational restraint release means preferably comprises: a rotational restraint cylinder device installed on the fixed body; an annular fixed body-side lifting groove formed on the fixed body; an annular rotating body-side lifting groove formed on the rotating body and communicating with the fixed body-side lifting groove; a fixed body-side locking member including a lifting main body part installed to be vertically movable in the fixed body-side lifting groove and connected to the rod of the rotational restraint cylinder device to perform a lifting operation according to the operation of the rod, and a ring-shaped rotational restraint part connected to the lower end of the lifting main body part, installed to be vertically movable in the rotating body-side lifting groove, and provided with locking pins protruding radially outwardly at radially spaced intervals; and a rotating body-side locking member fixedly installed on the rotating body-side lifting groove of the rotating body, having locking grooves formed on its bottom surface that interact with the locking pins to selectively bind the rotating body to the fixed body.

[0015] It is preferable that the fixed body side locking member and the rotating body side locking member further include a position restoration means for restoring the fixed body side locking member to its original position after the locking state between the fixed body side locking member and the rotating body side locking member is released, wherein the position restoration means comprises: a plurality of installation grooves formed at radial intervals on the upper surface of the rotating body side locking member; and a position restoration spring, one side of which is installed in each of the installation grooves and the other side of which elastically presses the lifting body part of the fixed body side locking member.

[0016] The above-described main shaft linkage means preferably comprises: a main shaft linkage cylinder device installed on the rotating body; a main shaft linkage spring comprising a coil portion arranged to wrap around the main shaft in a coil shape and a pair of extension portions extending radially outward from both ends of the coil portion; a first linkage groove portion formed in a groove shape on the rotating body to accommodate one of the pair of extension portions of the main shaft linkage spring and into which a fixing bolt is inserted to secure the accommodated extension portion; and a second linkage groove portion formed in a groove shape at a position adjacent to the first linkage groove portion of the rotating body to accommodate the other of the pair of extension portions of the main shaft linkage spring and to communicate with the cylinder hole of the main shaft linkage cylinder device so as to press the accommodated other extension portion by the main shaft linkage cylinder device.

[0017] The multi-axis angle head device for a machine tool capable of automatic angle adjustment according to the present invention, having the configuration described above, is configured such that the main spindle and the rotating body are selectively connected and rotated relative to each other by the operation of the main spindle linkage means, and the fixed body and the rotating body are selectively connected and rotated relative to each other by the operation of the rotation constraint release means. By transmitting an electrical signal to the motor, which is the driving source of the main spindle, the main spindle is automatically rotated, allowing the tool head to be smoothly adjusted to the required angle as needed. Consequently, the inconvenience of personnel having to always be on standby at the work site to adjust the angle of the tool head is eliminated, thereby reducing labor costs. Furthermore, by enabling precise automatic adjustment of the angle of the tool head, the effect of improving operational precision and work efficiency through automation is achieved.

[0018] FIG. 1 is a perspective view of a multi-axis angle head device for a machine tool capable of automatic angle adjustment according to an embodiment of the present invention.

[0019] FIG. 2 is an exploded perspective view of an embodiment of the present invention.

[0020] FIG. 3 is a bottom perspective view of a portion of a configuration employed in one embodiment of the present invention.

[0021] FIG. 4 is a cross-sectional view of a part processing operation state according to an embodiment of the present invention.

[0022] FIG. 5 is a cross-sectional view in an operating state for adjusting the tool head angle of an embodiment of the present invention.

[0023] FIG. 6 is a bottom view showing a comparison of the part processing operation state and the tool head angle adjustment state of an embodiment of the present invention.

[0024] In order to clarify the understanding of the present invention in the following description, descriptions of known technologies regarding the features of the present invention will be omitted. The following embodiments are detailed descriptions to aid in understanding the present invention and are not intended to limit the scope of the rights of the present invention. Accordingly, equivalent inventions that perform the same function as the present invention will also fall within the scope of the rights of the present invention.

[0025] Furthermore, in the following description, identical identification symbols denote identical configurations, and unnecessary redundant descriptions and descriptions of known technologies are omitted. Additionally, descriptions of each embodiment of the present invention below that overlap with the description of the technology forming the background of the invention are also omitted.

[0026] Hereinafter, a multi-axis angle head device for a machine tool capable of automatic angle adjustment according to one embodiment of the present invention will be described in detail with reference to the attached drawings.

[0027] FIG. 1 is a perspective view of a multi-axis angle head device for a machine tool capable of automatic angle adjustment according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of an embodiment of the present invention, FIG. 3 is a bottom perspective view of a part configuration employed in an embodiment of the present invention, FIG. 4 is a cross-sectional view of a part processing operation state of an embodiment of the present invention, FIG. 5 is a cross-sectional view of a tool head angle adjustment operation state of an embodiment of the present invention, and FIG. 6 is a bottom view showing a comparison of the part processing operation state and the tool head angle adjustment state of an embodiment of the present invention.

[0028] As illustrated in these drawings, a multi-axis angle head device for a machine tool capable of automatic angle adjustment according to one embodiment of the present invention comprises a collet chuck (1), a fixed body (2), a rotating body (4), and a tool head (6).

[0029] The above-mentioned collegiate is a component that receives rotational force from the main spindle (10) of a machine tool (which rotates along a unidirectional axis for processing parts) and rotates axially.

[0030] The fixed body (2) is positioned at the bottom of the collet chuck (1) while supported by the machine tool. In this embodiment, the fixed body (2) is fixedly installed on a bracket (3) connected to the machine tool, and a through hole is formed in the inner center to accommodate the main shaft (10).

[0031] The above-mentioned rotating body (4) is positioned in a manner that surrounds the main shaft (10) at the lower part of the above-mentioned fixed body (2) and is coupled to the above-mentioned fixed body (2) so as to be rotatable relative to it.

[0032] The rotating body (4) selectively performs rotation and fixation (non-rotatability state) operations with respect to the fixed body (2) according to the driving of a rotational restraint release means including a rotational restraint cylinder device.

[0033] As shown in (a) of FIGS. 4 and 6, when the rotating body (4) and the fixed body (2) are constrained to each other, the fixed body (2) is fixed to the bracket (3) connected to the machine tool side, so the rotation of the rotating body (4) is impossible and the angle of the tool head (6) cannot be adjusted, and the tools connected to the main spindle (10) rotate according to the rotation of the main spindle (10) and process the object.

[0034] Conversely, as shown in (b) of FIGS. 5 and 6, when the constraint between the rotating body (4) and the fixed body (2) is released, the rotating body (4) is placed in a state where it is free to rotate relative to the fixed body (2), and since the tool head (6) and the rotating body (4) are constrained to each other, the tool head (6) can be smoothly adjusted to the required angle.

[0035] The tool head (6) is positioned in a manner that surrounds the main shaft (10) at the lower part of the rotating body (4), and a plurality of tool mounting parts (61) are formed on the outer surface, arranged radially at the same angle.

[0036] Additionally, a plurality of bevel gears are rotatably installed in the internal space of the tool head (6). The bevel gears serve to dynamically connect the two elements between the main shaft (10) and the tool mounted on each tool mounting part (61).

[0037] Additionally, the tool head (6) is coupled to the rotating body (4) so ​​as to rotate with respect to the fixed body (2) together with the rotating body (4), and allows relative rotation of the main shaft (10) (see FIG. 4) or rotates together with the main shaft (10) according to the driving of the main shaft linkage means including the main shaft linkage cylinder device (71) (see FIG. 5).

[0038] In the multi-axis angle head device for a machine tool capable of automatic angle adjustment according to one embodiment of the present invention having such a configuration, as shown in FIGS. 4 and 6(a), when the main shaft (10) is placed in a state where it is free to rotate relative to the rotating body (4) by driving the main shaft (10) linkage means, the main shaft (10), which is kinetically connected to a driving source such as a motor driven based on an electrical signal, rotates, and a plurality of bevel gears connected to the main shaft (10) and tools connected to each bevel gear rotate, thereby enabling the processing of a workpiece.

[0039] In particular, as shown in the enlarged right portion of FIG. 4, the clamping between the main shaft linkage spring (72) employed in the main shaft linkage means and the main shaft (10) is released, thereby enabling relative rotation of the main shaft (10) with respect to the rotating body (4), and as shown in the enlarged left portion of FIG. 4, the locking pin (222a) employed in the rotational restraint release means engages with the locking groove (421), so that the rotating body (4) is firmly fixed to the fixed body (2) during the rotational movement of the main shaft (10), thereby enabling precise implementation of the rotational movement of the main shaft (10).

[0040] Conversely, as shown in FIG. 5 and FIG. 6(b), the multi-axis angle head device for a machine tool capable of automatic angle adjustment according to the present embodiment is configured such that when the main spindle (10) is connected to the rotating body (4) in accordance with the driving of the main spindle (10) linkage means, it can rotate together with the rotating body (4) during the rotational movement of the main spindle (10), and the tool head (6) connected to the rotating body (4) rotates together with the main spindle (10) to be adjusted to the required angle.

[0041] In particular, as shown in the enlarged right portion of FIG. 5, the clamping state between the main shaft linkage spring (72) employed in the main shaft linkage means and the main shaft (10) is maintained so that the main shaft (10) and the rotating body (4) can rotate together, and as shown in the enlarged left portion of FIG. 5, the engagement state between the locking pin (222a) and the locking groove (421) employed in the rotational restraint release means is released, thereby releasing the connection state between the rotating body (4) and the fixed body (2), so that when the main shaft (10) rotates, the rotating body (4) rotates relative to the fixed body (2), allowing the angle of the tool head (6) connected to the rotating body (4) to be smoothly adjusted.

[0042] A multi-axis angle head device for a machine tool capable of automatic angle adjustment according to an embodiment of the present invention having the configuration described above is configured such that the main spindle (10) and the rotating body (4) are selectively connected and rotated relative to each other by the operation of the main spindle (10) linkage means, and the fixed body (2) and the rotating body (4) are selectively connected and rotated relative to each other by the operation of the rotation restraint release means. By sending an electrical signal to the motor, which is the driving source of the main spindle (10), the main spindle (10) is automatically rotated so that the tool head (6) can be smoothly adjusted to the required angle as needed. This eliminates the inconvenience of having personnel always on standby at the work site to adjust the angle of the tool head (6), thereby reducing labor costs. Furthermore, by enabling precise automatic adjustment of the angle of the tool head (6), it has the advantage of allowing for improved operational precision and work efficiency through automation.

[0043] The rotational restraint release means employed in this embodiment comprises, as clearly illustrated in FIGS. 3 to 5, a rotational restraint cylinder device (not shown), a fixed body side lifting groove (21), a fixed body side locking member (22), and a rotating body side locking member (42).

[0044] The above-mentioned cylinder device for rotational restraint is installed on the fixed body (2), and the lifting groove portion (21) on the fixed body side is formed as an annular groove structure in the fixed body (2) to enable the lifting of the lifting main body portion (221), which is a part to be described later and is connected to the lifting main body portion (221), which is a part housed therein.

[0045] The fixed body side locking member (22) comprises a lifting main body part (221) connected to the rod of the rotation restraint cylinder device, and a ring-shaped rotation restraint part (222) connected to the lower end of the lifting main body part (221) and having a locking pin (222a) that interacts with the rotation body side locking member (42) and performs a lifting operation together with the lifting main body part (221).

[0046] The above lifting body part (221) is connected to the rod of the rotation restraint cylinder device and is installed to be able to move up and down in the fixed body side lifting groove part (21), so that it performs a lifting operation according to the operation of the rod.

[0047] The above rotational restraint part (222) is installed to be vertically movable in the rotational body side lifting groove part (41) together with the above lifting main body part (221), and is provided with locking pins (222a) that are formed to protrude radially outward at radial intervals. As clearly illustrated in the left enlarged portion of FIG. 4 and the left enlarged portion of FIG. 5, each locking pin (222a) interacts with the locking groove (421) of the rotational body side locking member (42) to selectively bind the rotational body (4) and the fixed body (2).

[0048] The above-mentioned rotating body side locking member (42) is fixedly installed in the rotating body side lifting groove (41) of the rotating body (4), and locking grooves (421) are formed on the bottom surface to selectively bind the rotating body (4) to the fixed body (2) by interacting with the locking pins (222a).

[0049] The present embodiment having such a configuration has the advantage that, as shown in FIG. 4, when the locking pin (222a) of the fixed body side locking member (22) engages with the locking groove (421) of the rotating body side locking member (42) according to the operation of the rotational restraint cylinder device, the rotating body (4) can be rotated relative to the fixed body (2), so that the rotating body (4) is firmly fixed to the fixed body (2) without shaking during the rotational movement of the main shaft (10), thereby enabling precise rotational movement of the main shaft (10), and as shown in FIG. 5, when the engagement between the locking groove (421) and the locking pin (222a) is released according to the operation of the rotational restraint cylinder device, relative rotation of the rotating body (4) relative to the fixed body (2) becomes possible, thereby enabling angle adjustment of the tool head (6) coupled to the rotating body (4).

[0050] The present invention preferably further includes a position restoration means for restoring the fixed body side locking member (22) to its original position after the locking state between the fixed body side locking member (22) and the rotating body side locking member (42) is released.

[0051] The above position restoration means can be implemented by various configurations, but in this embodiment, it is implemented by a plurality of installation grooves (422) and a position restoration spring (5).

[0052] That is, the plurality of installation grooves (422) are formed radially spaced apart on the upper surface of the rotating body side locking member (42), and the position restoration spring (5) has one side installed in each of the installation grooves (422) and the other side elastically presses the lifting main body (221) of the fixed body side locking member (22).

[0053] The present embodiment having such a configuration has the advantage that, when angle adjustment of the tool head (6) is required as in Fig. 5 after product processing using a tool as in Fig. 4, the lifting body part (221) of the rotating body side locking member (42) moves downward in a direction that compresses the position restoration spring (5), thereby releasing the engagement between the locking groove (421) and the locking pin (222a), and when product processing using a tool is required as in Fig. 4 after adjusting the tool head (6) to a desired angle, the lifting body part (221) can be smoothly restored to its original initial position by the elastic force of the position restoration spring (5), so that the initial position between each part can be precisely set during the initial operation of the angle head device according to the present embodiment.

[0054] Meanwhile, as clearly illustrated in FIGS. 2 to 4, the main shaft (10) linkage means comprises a main shaft linkage cylinder device (71), a main shaft linkage spring (72), a first linkage groove (431), and a second linkage groove (432).

[0055] The above-mentioned main shaft linkage cylinder device (71) is installed on the rotating body and is equipped with a rod that performs an in-and-out movement according to an external pneumatic or hydraulic driving source.

[0056] The above-mentioned main shaft linkage spring (72) includes a coil portion (721) arranged to wrap around the main shaft (10) in a coil shape, and a pair of extension portions (722) (723) formed to extend radially outward from both ends of the coil portion (721).

[0057] The first interlocking groove (431) is formed in a groove shape in the rotating body as shown by the dotted line in FIG. 4, and accommodates one of the pair of extension parts (722) (723) of the main shaft interlocking spring (72), and a fixing bolt (70) (see FIG. 2 and FIG. 3) is inserted to fix the accommodated extension part (722).

[0058] The second interlocking groove (432) is formed in a groove shape at a position adjacent to the first interlocking groove (431) of the rotating body, and accommodates the other one (723) of a pair of extensions (722) (723) of the main shaft interlocking spring (72), and communicates with the cylinder hole (433) (see dotted line in FIG. 4) of the main shaft interlocking cylinder device (71) so that the accommodated other extension (723) can be pressed by the main shaft interlocking cylinder device (71) (see FIG. 2 and FIG. 3).

[0059] In this embodiment having such a configuration, when the rod of the main shaft linkage cylinder device (71) is pulled out as in FIG. 3(a) and presses against the other one (723) of the pair of extension parts (722) (723), the clamping state between the coil part (721) of the main shaft linkage spring (72) and the main shaft (10) is released as in FIG. 4, thereby allowing the main shaft (10) to rotate freely relative to the rotating body (4), thus enabling part processing using a tool. When the rod of the main shaft linkage cylinder device (71) is pulled in as in FIG. 3(b) and the pressure of the rod against the other extension part (723) is released, the coil part (721) clamps the main shaft (10) as in FIG. 5, causing the main shaft (10) and the rotating body (4) to rotate together, and accordingly, by rotating the main shaft (10) based on an electrical signal, the angle of the tool head (6) It becomes possible to adjust smoothly and automatically without relying on manual work by the operator.

[0060] Although various embodiments of the present invention have been described above, these embodiments and the drawings attached to this specification merely clearly illustrate a part of the technical concept included in the present invention. It is obvious that variations and specific embodiments that can be easily deduced by a person skilled in the art within the scope of the technical concept included in the specification and drawings of the present invention are all included within the scope of the rights of the present invention.

Claims

1. A collet chuck that receives rotational force from the main spindle of a machine tool (which rotates along a unidirectional axis for processing parts) and rotates axially; A fixed body positioned at the lower part of the collet chuck while supported by the above-mentioned machine tool; A rotating body disposed in a manner that encloses the main shaft at the lower part of the fixed body and coupled to the fixed body so as to be rotatable relative thereto, wherein rotation and fixation (non-rotatable state) operations relative to the fixed body are selectively performed according to the driving of a rotation restraint release means including a rotation restraint cylinder device; and A multi-axis angle head device for a machine tool capable of automatic angle adjustment, characterized by comprising: a tool head coupled to a rotating body to rotate together with the rotating body and allowing relative rotation of the main spindle or rotating together with the main spindle according to the driving of a main spindle linkage means including a cylinder device for main spindle linkage; wherein a plurality of tool mounting portions are formed on the outer surface of the rotating body in a manner that surrounds the main spindle and are arranged radially at the same angle, and a plurality of bevel gears are rotatably installed in the internal space to transmit rotational power of the main spindle to the tool side mounted on each tool mounting portion.

2. In Paragraph 1, The above rotational restraint release means is, A cylinder device for rotational restraint installed on the above fixed body; A ring-shaped lifting groove on the fixed body side formed in the above fixed body; An annular lifting groove on the rotating body side formed in the above-mentioned rotating body and communicating with the lifting groove on the fixed body side; A fixed body-side locking member comprising: a lifting main body part installed to be vertically movable in the vertical direction in the lifting groove on the fixed body side and connected to the rod of the rotation restraint cylinder device to perform a lifting operation according to the operation of the rod; and a ring-shaped rotation restraint part connected to the lower end of the lifting main body part, installed to be vertically movable in the vertical direction in the lifting groove on the rotational body side, and having locking pins formed to protrude radially outwardly at radially spaced intervals; and A multi-axis angle head device for a machine tool capable of automatic angle adjustment, characterized by including: a rotating body-side locking member that is fixedly installed in the lifting groove portion on the rotating body side of the rotating body, and has locking grooves formed on its bottom surface that interact with the locking pins to selectively bind the rotating body to the fixed body.

3. In Paragraph 2, The device further includes a position restoration means for restoring the fixed body-side locking member to its original position after the locking state between the fixed body-side locking member and the rotating body-side locking member is released. The above position restoration means is, A plurality of installation grooves formed radially spaced on the upper surface of the locking member on the rotating body side; and A multi-axis angle head device for a machine tool capable of automatic angle adjustment, characterized by comprising: a position restoration spring, one side of which is installed in each of the above-mentioned installation grooves and the other side of which elastically presses the lifting main body of the above-mentioned fixed body side locking member.

4. In Paragraph 1, The above-mentioned main shaft linkage means is, A cylinder device for linking the main shaft installed on the above-mentioned rotating body; A spring for linking a main shaft, comprising a coil portion arranged to wrap around the main shaft in a coil shape and a pair of extension portions extending radially outward from both ends of the coil portion; A first interlocking groove formed in a groove shape in the above-mentioned rotating body, into which a fixing bolt is inserted to accommodate one of a pair of extensions of the main shaft interlocking spring and to fix the accommodated extension; and A multi-axis angle head device for a machine tool capable of automatic angle adjustment, characterized by including: a second interlocking groove portion formed in a groove shape at a position adjacent to the first interlocking groove portion of the rotary body, which accommodates the other of a pair of extension portions of the main shaft interlocking spring and communicates with the cylinder hole of the main shaft interlocking cylinder device so as to be able to press the accommodated other extension portion by the main shaft interlocking cylinder device.

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