JPH0112887Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a cutting tool holding device for attaching a rotary cutting tool to the spindle of a machine tool. This invention relates to a cutting tool holding device that can be used quickly.

BACKGROUND TECHNOLOGY Bayonet joints have traditionally been used to quickly attach and detach rotary cutting tools such as drills, reamers, end mills, taps, etc. to the spindle of machine tools and to achieve high repeatability.
One of them is described in Japanese Patent Application Laid-open No. 54-67277. This is a device for holding a tap and has several features, one of which is that it can transmit rotational torque in both forward and reverse directions to the tap and is easy to attach and detach.

This tap holding device includes a drive shaft that remains attached to the spindle of a machine tool, and a tool holder that is detachable from the drive shaft. The drive shaft has a center hole opening at the tip, an engagement notch cut in the axial direction from the annular tip surface surrounding the opening of the center hole and having a constant width in the circumferential direction, and a first member of the bayonet joint. It is equipped with
On the other hand, the tool holder includes a fitting part that fits into the center hole of the drive shaft so that it can move and rotate relative to the center hole in the axial direction.
The second member is provided with a second member that engages with and disengages from the first member of the bayonet joint by relative movement and rotation in the axial direction, and a tap holding portion that holds the tap. A non-rotating sleeve is fitted to the outside of the tool holder so that it cannot rotate relatively and can move relatively in the axial direction between an active position and a non-active position, and is actuated by a spring as a biasing means. and is biased into the operating position. The anti-rotation sleeve is provided with an anti-rotation protrusion, and when the anti-rotation sleeve is in the active position, the anti-rotation protrusion engages with the engagement notch of the drive shaft to prevent rotation relative to the drive shaft, and when the anti-rotation sleeve is in the active position, In this position, it is disengaged from the engagement notch to allow relative rotation.
This anti-rotation sleeve cannot rotate relative to the tool holder, so when the anti-rotation sleeve is in the working position and cannot rotate relative to the drive shaft, the tool holder can rotate in either the forward or reverse direction. The tool holder also becomes unable to rotate relative to the tool holder, and rotational torque in both forward and reverse directions can be transmitted from the drive shaft to the tool holder and the tap held therein.

Moreover, since the anti-rotation sleeve is attached to the tool holder and is biased toward the drive shaft by the biasing means, when it is removed, the anti-rotation sleeve must be moved in a direction away from the drive shaft against the biasing force. When the tool holder is rotated through a certain angle, the bayonet joint is disengaged and the tool holder can be removed from the drive shaft. This operation can be performed with one hand, and can be easily attached and detached even when the other hand is occupied or when only one hand is available due to space constraints.

Although this device is for holding taps, the above features of this device can also be applied to holding devices for other rotary cutting tools such as drills, reamers, and end mills. It can also be constructed integrally with the spindle of the machine. In other words, the spindle of the machine tool can be provided with a center hole, an engagement notch, and the first member of the bayonet joint, so that the spindle itself can function as a drive shaft.

Problems to be Solved by the Invention Although the above-mentioned device has excellent functions, there are still points that need to be improved in terms of structure. That is, relative rotation of the rotation prevention sleeve with respect to the drive shaft is prevented by the engagement between the rotation prevention protrusion provided on the rotation prevention sleeve and the engagement notch formed on the end surface of the drive shaft, and the rotation prevention sleeve and tool holder are prevented from rotating relative to each other. Relative rotation with the tool holder is prevented by engagement between a rotation prevention protrusion protruding from the outer peripheral surface of the tool holder and an engagement groove formed on the inner peripheral surface of the rotation prevention sleeve. Therefore, the shapes of the rotation prevention sleeve and the tool holder are complicated, and machining is troublesome. In addition to the anti-rotation protrusion, an engagement groove must be formed on the anti-rotation sleeve, which is cumbersome to process, and the thickness of the anti-rotation sleeve must be increased by the amount of the engagement groove. Furthermore, the tool holder must be provided with a rotation prevention projection that engages with the engagement groove, and it is troublesome to form the rotation prevention projection on the outer peripheral surface of the shaft-like object.

The present invention eliminates this drawback and provides a cutting tool holding device that can transmit rotational torque in both forward and reverse directions, is easy to attach and detach, and has a simple structure and easy processing. This was done with this in mind.

Means for Solving the Problems The gist of the present invention is to provide a cutting tool holding device, like the tap holding device, which includes a drive shaft, a tool holding body, a rotation prevention sleeve, and a biasing means.
A radially outward flange is provided at a position adjacent to the fitting portion of the tool holder, and a first engagement is provided at a portion of the flange that faces the engagement notch (referred to as the first engagement notch) of the drive shaft. a second engagement notch having the same width as the notch and penetrating the flange, and
The anti-rotation protrusion of the anti-rotation sleeve is engaged with both the first engagement notch and the second engagement notch in the operating position,
In the non-operating position, it has a length that separates from the first engagement notch and engages only the second engagement notch.

In the cutting tool holding device configured as described above, relative rotation of the rotation prevention sleeve with respect to the tool holder is prevented by the engagement between the rotation prevention protrusion and the second engagement notch, and the rotation prevention sleeve is prevented from rotating relative to the tool holder. In the operating position, the same anti-rotation protrusion engages with the first engagement notch of the drive shaft, thereby preventing relative rotation between the anti-rotation sleeve and the drive shaft.

Then, when the anti-rotation sleeve attached to the tool holder is moved to the non-operating position against the urging force of the urging means, the anti-rotation protrusion is disengaged from the first engagement notch of the drive shaft, and the tool holder is moved to the non-operating position. It becomes possible to rotate the body, disengage the bayonet joint, and remove the tool holder from the drive shaft.

Effects of the invention As is clear from the above explanation, in the cutting tool holding device according to the invention, the anti-rotation protrusion of the anti-rotation sleeve is connected to the second engagement notch of the tool holder and the first engagement notch of the drive shaft. By straddling and engaging with the drive shaft, relative rotation between the drive shaft and the tool holder is prevented, and the anti-rotation sleeve only needs to be provided with an anti-rotation protrusion, unlike the conventional device described above. Since there is no need to form an engagement groove on the inner circumferential surface, the shape is simple and processing is easy.

Furthermore, since the tool holder is provided with a radially outward flange and the second engaging notch is provided on the flange, the tool holder can be easily processed. Rather than forming a detent protrusion that engages with an engagement groove on the outer peripheral surface of a shaft-like object, it is easier to form a flange facing outward in the radial direction and cut out a part of the flange to provide an engagement notch. It's easy.

Furthermore, the anti-rotation protrusion functions as a kind of rotation transmission key by straddling and engaging the first engagement notch of the drive shaft and the second engagement notch of the tool holder, so it must have sufficient strength. However, since a large load is not applied to other parts of the anti-rotation sleeve during rotational torque transmission, and there is no need to form an engagement groove on the inner circumferential surface, the thickness of the anti-rotation sleeve can be reduced. It can be made thinner, and the outer diameter of the cutting tool holder can also be reduced.

Embodiments Hereinafter, two or three embodiments of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, 2 is a spindle of a rotary cutting machine. The spindle 2 has a bottomed center hole 6 (hereinafter referred to as spindle hole) concentrically with its axis from the tip end surface 4 toward the rear end side. A holder is inserted. In this embodiment, the spindle 2 itself functions as a drive shaft that is a component of the cutting tool holding device.

As shown in FIGS. 3 and 4, the holder main body 8 is a substantially cylindrical member having a large diameter portion on the tip side, and has a shaft portion of a drill, reamer, groove milling cutter, or boring tool in the center. A female screw hole 10 for screwing a tool is formed, and a pair of long holes 12 are formed facing each other in a direction parallel to the center line of the female screw hole 10. As shown in FIGS. 1 and 2, both protruding ends of a drive pin 16 press-fitted into the torque transmitting member 14 are slidably fitted into the elongated holes 12. Torque transmission member 14 is connected to female threaded hole 1 through
It is held movably within 0. An engagement groove 18 is formed in one end surface of the torque transmission member 14, and an engagement protrusion provided on the end surface of the shaft portion of the cutting tool is engaged with the groove 18, and is screwed into the female threaded hole 10. By rotating the adjusting screw 20, the amount of protrusion of the cutting tool from the holder body 8 is adjusted.

A collet 22 having a tapered outer circumferential surface corresponding to the tapered inner circumferential surface of the main body 8 is provided at the large diameter portion of the tip of the holder body 8, and is screwed into a clamp nut 24 at a portion protruding from the main body 8. .
The clamp nut 24 has a structure as shown in FIGS. 7 and 8, and as is clear from FIG. 1, it can only be rotated by a number of balls 26 provided between it and the holder body 8 holder body 8
The clamp nut 24 is fitted onto the outer peripheral surface of the clamp nut 24.
is rotated and the collet 22 is screwed back into the holder 8, thereby tightening the shaft portion of the cutting tool whose protrusion amount has been adjusted. In this embodiment, the tool holder is constructed by including the holder main body 8 as a core, a collet 22 and a clamp nut 24 attached thereto, the torque transmitting member 14, the adjusting screw 20, and the like.

As is clear from FIGS. 3 and 4, a radially outward flange 28 is provided at the large diameter portion of the tip of the holder body 8, located between the relatively long and small diameter main portions. It is being The flange end surface 30 of the flange 28 on the main body side serves as a thrust load transmission surface toward the rear end of the spindle, while the tip of the spindle 2 is in surface contact with the flange end surface 30 as shown in FIG. Surface 4 serves as a thrust load receiving surface.

A rotation prevention sleeve 32 is provided between the flange 28 of the holder body 8 and the clamp nut 24 to prevent relative rotation between the body 8 and the spindle 2. As shown in FIGS. 9 and 10, the anti-rotation sleeves 32 are arranged at symmetrical positions (in other words, at equal angular intervals of 180°) across the center line of the opening end surface of the main body 8 on the flange 28 side. ) A pair of protruding anti-rotation protrusions 34 are provided, and the anti-rotation protrusions 34 form a pair of engagement notches formed on the outer periphery of the flange 28 of the holder main body 8 as shown in FIGS. 5 and 6. 36, and are assembled to the holder main body 8 so as to be non-rotatable but slidable in the axial direction. Furthermore, as is clear from FIG.
8, it is always urged toward the flange 28 side. A pair of engagement notches 40 are also formed on the distal end surface 4 of the spindle 2 at equal angular intervals of 180° from the distal end surface 4 toward the rear end side. When the phases of the engagement notches 40 on the spindle 2 side match each other, the detent protrusion 34 of the detent sleeve 32 is engaged by the biasing force of the spring 38 across both the engagement notches 36 and 40. This prevents relative rotation between the holder main body 8 and the spindle 2 in the assembled state. In other words, the anti-rotation protrusion 34 functions as a kind of key.
In this case, the anti-rotation sleeve 32, the engagement notches 36, 40, etc. constitute relative rotation prevention means.

On the other hand, a fixing bush 42 having a substantially bottomed cylindrical shape is fixed to the bottom of the spindle hole 6 with a bolt 44, with an opening provided on the tip side of the spindle 2. Button 42 is the 12th
As shown in FIG. 13 and FIG.
It is fitted into an eccentric hole formed in the deepest part of the bush 42 and is bolted in the direction of the center line of the hole 6 to prevent rotation relative to the spindle 2, and the bottom surface of the bush 42 and the step of the spindle hole 6 are prevented from rotating relative to the spindle 2. A spacer (shim) 48 is interposed between the end surface of the protrusion 46 and the bottom surface of the eccentric hole.
A gap approximately corresponding to the thickness of the spacer 48 is maintained. A shaft-shaped locking member 52 is disposed in the opening of the fixed bush 42, that is, in the circular bush hole 50, in the direction of the center line of the spindle hole 6. The locking member 52 is shown in FIG.
As is clear from FIG. 5, the rear end is provided with a hexagonal portion 54 integrally provided, and the hexagonal portion 54 is connected to the bushing hole 5 as shown in FIGS. 13 and 14.
By being slidably fitted into a hexagonal hole 56 formed on the bottom surface of the spindle hole 6, the spindle hole 6 is movable a certain distance in the direction of the center line of the spindle hole 6, and is held unrotatable around the center line of the hole 6. There are. Butsuyu 4
2, a circular countersunk hole 58 in which the head of the bolt 44 is seated is formed next to the hexagonal hole 56, and a bolt hole 60 is further provided continuously thereto.

A flange-shaped spring receiving part 62 is integrally formed on the locking member 52 next to the hexagonal part 54, and the spring receiving part 62 and a C-shaped ring 64 (this A disc spring 66 functioning as a biasing means is provided with a predetermined compressive preload between the spring receiver and the spring receiver, and its biasing force causes the locking member 52 to move. It is urged toward the rear end side of the spindle 2. The retracted end position of the locking member 52 is defined by the spring receiving portion 62 being seated on the bottom surface of the bushing hole 50.

The locking member 52 projects from the opening of the bush 42 toward the distal end of the spindle 2 by a certain distance, and is inserted into a pin hole 68 formed at the protruding distal end.
A locking pin 70 having a circular cross section is press-fitted through the locking member 52 in the diametrical direction and protruding by the same amount from both sides of the outer peripheral surface of the locking member 52, and the protruding portions on both sides of the pin 70 serve as locking parts. It is designed to play a role. Note that the locking member 5 including the pin 70
A wrench insertion hole 72 is provided that passes through the spindle hole 6 in the axial direction, and a wrench is engaged with the hexagonal hole part 74 of the bolt 44 through the wrench insertion hole 72 from the tip side of the spindle hole 6 to release the fastening by the bolt 44. This allows the above-mentioned parts fixed to the spindle 2, including the bush 42, to be removed integrally.

On the other hand, as is clear from FIGS. 3, 4, and 6, an inner flange 76 facing inward in the radial direction is provided at the rear end of the holder main body 8.
The flange hole 7 whose inner peripheral edge is circular
8 is formed. The diameter of the flange hole 78 is slightly larger than the outer diameter of the outer periphery of the tip of the locking member 52, but is smaller than the length of the locking pin 70, and the length of the pin 78 is set near the flange 76. The inner diameter of the holder body 8 is set to be somewhat smaller than the inner diameter of the holder body 8. A groove-shaped fitting notch 80 is formed at the rear end of the holder body 8 by dividing the inner flange 76 in the diametrical direction and passing through to the outer peripheral surface of the main body 8. is the locking pin 70
The pin 70 is made slightly wider than the outer diameter of the inner flange 76 , and the pin 70 enters into the holder body 8 through the notch 80 and can engage with the inner surface of the flange of the inner flange 76 based on the rotation of the body 8 . That is, in this embodiment, the inner flange 76, the fitting notch 80, etc. of the holder main body 8 constitute the locked portion.
As is clear from FIG. 1, the holder body 8
When the flange 28 at the tip of the locking member 52 is in contact with the spindle tip surface 4 and the direction of the locking pin 70 and the direction of the fitting notch 80 are aligned in the direction of the center line of the spindle hole 6, the tip of the locking member 52 is The locking pin 70 fits into the flange hole 78, and the locking pin 70 fits into the notch 8.
0, and the rear end of the outer peripheral surface of the pin 70 is slightly closer to the spindle 2 than the inner surface of the inner flange 76.
The pin 70 and the inner flange 7 are located on the rear end side in the rotational direction around the center line of the holder body 8.
The relative positional relationship between the holder main body 8 and the locking member 52 is selected such that the holder main body 8 and the locking member 52 partially interfere with each other.

In the tool holding device configured as described above, when inserting the tool holding body including the holder body 8 into the spindle hole 6, the shaft portion of a cutting tool such as a drill is screwed into the female threaded hole 10 of the holder body 8 in advance. is engaged with the torque transmitting member 14, the amount of protrusion from the tip of the main body 8 is adjusted by the adjusting screw 20, and the cutting tool is clamped by the clamp nut 24. Thereafter, the holder body 8 is rotated at a specific rotational phase, that is, at a relative phase in which the orientations of the locking pin 70 and the fitting notch 80 match each other, until the flange 28 of the body 8 hits the tip surface 4 of the spindle 2. When inserted into the hole 6, the locking pin 70 is fitted into the notch 80 as shown in FIG. However, in reality, after the rear end of the holder body 8 (the outer end surface of the flange 76) is brought into contact with the locking pin 70, the above-mentioned fitted state is achieved by rotating the holder body 8 and adjusting its phase. You will get it. Further, in this state, the holder main body 8 can also be removed to the tip side of the spindle 2.

Then, when the holder main body 8 is rotated by a certain small angle in any arbitrary direction around the center line of the spindle hole 6 while maintaining the above state, the inner edge of the notch 80 connects the locking pin 70 to the inner surface of the inner flange 76. By forcibly riding on the body 8 and pulling it toward the main body 8, the locking member 52 resists the biasing force of the disc spring 66 and is further compressed, as shown in FIG. be moved slightly.
At this time, the locking pin 70 comes into contact with the inner edge of the notch 80.
The outer circumferential surface functions as a kind of cam. Then, the holder main body 8 is rotated approximately 90 degrees and the locking pin 7 is rotated approximately 90 degrees.
0 and the fitting notch 80 are approximately perpendicular to each other, the holder main body 8 is aligned with the inner flange 7
It is locked to the rear end side of the spindle 2 through a locking pin 70 that engages with the inner surface of the spindle 2 under a biased state by the biasing force of a disc spring 66 .

That is, in this embodiment, the locking member 52 and the inner flange 76 function as the first and second members of the bayonet joint, respectively, and as a result of being locked in this way, the holder body 8 is The end surface 30 of the flange 28, which is a thrust load transmitting surface, is maintained in close contact with the tip end surface 4, which is a thrust load receiving surface, of the spindle 2 by the biasing force of the disc spring 66. Note that a certain clearance is maintained between the outer end surface of the inner flange 76 and the front end surface of the fixed bush 42. In this state, the pair of anti-rotation protrusions 34 of the anti-rotation sleeve 32 are fitted into the engagement notches 40 at the tip of the spindle by the biasing force of the spring 38, whereby the holder body 8 and the spindle 2 are fitted together. The relative rotation around the center line of the spindle hole 6 is reliably prevented both in the direction in which the cutting torque is applied and in the opposite direction. The locking projection 34 of the sleeve 32 and the engagement notch 40 of the spindle 2 are provided in such a relative positional relationship with respect to the locking pin 70.

When removing the holder body 8 from the spindle 2, tighten the anti-rotation sleeve 32 into the clamp nut 24.
If the holder body 8 is rotated approximately 90 degrees with the spindle engagement notch 40 and the locking protrusion 34 disengaged, the locking pin 70 and the flange 76 will engage with each other. comes off, resulting in the state shown in Figure 1. Thereafter, the holder body 8 only has to be pulled out toward the tip end side of the spindle 2, and the operator can easily remove the holder body 8 with only one hand, and the holder body 8 can be quickly attached and detached from the spindle 2, and the tool can also be replaced quickly. This is possible.

Another embodiment of the invention is shown in FIG. In the cutting tool holding device of this embodiment, the locking portion between the spindle 2 and the holder main body 8 has been changed, and a fixing bush 92 is attached to the bottom of the spindle hole 6 via a spacer 90 with a bolt 94. Fixed. This fixing bush 92 is a bottomed cylindrical member having an opening at the tip side of the spindle 2, and the opening is in the shape of a track connecting two opposing circular arcs with two parallel straight lines, as shown in FIG. is doing. Inside the fixed bushing 92, there is a hole 96 that extends from the opening toward the bottom side and has the same cross-sectional shape as the opening, and a hole 96 that is continuous with the hole 96 and has a diameter equal to a circle that includes two arcs that form the opening. A bottomed hole 98 with a circular cross section is formed. Bottomed hole 98
A spring receiver 100 is slidably fitted inside, and this spring receiver 100 is always connected to the open side of the fixed bush 92 by a spring 102 disposed between the bottom surface of the bottomed hole 98 and the bottom surface of the bottomed hole 98. That is, the spindle 2 is biased toward the tip side. The spring receiver 100 is
As shown in FIGS. 18 and 19, it consists of a bottom portion 104 that has the same shape as the opening of the fixed bushing 92 but is slightly smaller, and legs 106, 106 that extend from both ends of the bottom portion 104 in the longitudinal direction, respectively.
It is fitted into the bottomed hole 98 so as to be out of phase with the hole 96 by 90 degrees and to cover the spring 102 . Furthermore, a notch 108 extending in the axial direction is formed in one of the leg parts 106, and a pin 110 that passes through the cylindrical part of the fixing bush 92 in the radial direction is formed in this notch 108.
By inserting the tip of the spring receiver 10
0 rotation is prevented. 112 is spring receiver 1
This is a through hole provided in the bottom part 104 of the bolt 94, and a wrench inserted through the spindle hole 6 and the through hole 112 is inserted into the bolt 94 as in the previous embodiment.
By engaging the head of the bolt 94 and unfastening the bolt 94, the fixing bush 92 and other parts fixed to the spindle 2 can be removed as one unit.

On the other hand, at the rear end of the holder body 8, as shown in FIGS. 16 and 20, there is a protrusion 114 with a circular cross section extending from the rear end surface of the holder body 8, and a radially outward flange 116 following the protrusion 114. is provided. The diameter of the protrusion 114 is slightly smaller than the distance between two parallel straight lines defining the hole 96 in the fixed bushing 92, and the flange 116 is formed in a similar shape that is slightly smaller than the hole 96 in the fixed bushing 92. ing. Projection 114, flange 11
6 has a female threaded hole 10 passing through them in the axial direction.
A tool insertion hole 118 communicating with the flange 116 is provided, and a tool is inserted through the opening on the flange 116 side to adjust the adjustment screw 20 screwed into the female threaded hole 10.

Portions other than those described above are the same as those in the previous embodiment, and corresponding portions are given the same reference numerals and detailed explanations will be omitted. Note that 119 is a pin for preventing relative rotation between the holder body 8 and the collet 22, and is press-fitted into a hole in the holder body 8.

When attaching the tool holder to the spindle 2 in the cutting tool holder configured as described above, the tool holder to which a cutting tool such as a drill is attached is rotated in a specific rotational phase, that is, the flange of the holder body 8 116 and the hole 96 provided in the fixed bush 92 are inserted into the spindle hole 6 in such a manner that the relative phases match each other. And flange 11
6 is inserted into the bottomed hole 98 through the hole 96, and then the holder body 8 is rotated approximately 90 degrees in any arbitrary direction around the center line of the spindle 2. Then flange 116
intersects the opening of the hole 96 on the bottomed hole 98 side at a substantially right angle, and is connected to the bottomed hole 98 by the spring 102.
The holder body 8 is pressed against the shoulder surface formed at the boundary between the hole 96 and the hole 96, and the holder body 8 is now locked to the spindle 2 in the state shown in FIG. That is, in this embodiment, the fixed bush 92 serves as the first member of the bayonet joint, and also serves as the first member of the bayonet joint and the protrusion 114 of the holder body 8 and the flange 1.
16 functions as the second member.
The flange 116 is fitted into the bottomed hole 98 when the holder body 8 is inserted until the flange 28 comes into contact with the distal end surface 4 of the spindle 2, and the length of the holder body 8 is The selection was made to obtain the following relationship.

As described above, the holder body 8 is attached to the spindle 2.
When the locking sleeve 32 is locked, the pair of locking protrusions 34 of the locking sleeve 32 are aligned with each of the engagement notches 40 at the tip of the spindle, and are fitted into the respective locking notches 40 by the biasing force of the spring 38, thereby locking the holder. The main body 8 is attached to the spindle 2 so that it cannot rotate relative to the spindle 2 both in the direction in which cutting torque is applied and in the opposite direction. sleeve 3
The locking projection 34 of No. 2 and the engagement notch 40 of the spindle 2 are provided in such a relative positional relationship with respect to the flange 116, and the fixing button 92 has the locking projection 34, the engagement notch 40 of the spindle 2,
The flanges 116 are fixed in the spindle hole 6 in a phase that provides the above-mentioned relative relationship. At this time, the flange 28 is slightly separated from the tip surface 4 because the flange 116 of the holder main body 8 is urged by the spring 102 toward the opening side of the bottomed hole 98, that is, toward the tip side of the spindle 2. This will leave them in a state of

On the other hand, when removing the holder main body 8 from the spindle 2, the rotation prevention sleeve 32 is pushed down toward the clamp nut 24, and the spindle 2 is removed.
Release the engagement between the engagement notch 40 and the locking protrusion 34, and keep it as it is with the holder main body 8.
By rotating it 90 degrees, the engagement between the flange 116 and the shoulder surface of the fixing bush 92 is released, and the holder body 8
can be removed from the spindle 2. Since this series of removal operations can be easily performed by the operator with only one hand, it is possible to not only attach the holder body 8 to the spindle 2, but also to remove it easily and quickly.

In addition, as mentioned above, the holder main body 8 is connected to the flange 1.
16 is biased toward the distal end of the spindle 2 by the spring 102, so when the flange 116 and the hole 96 are in phase with each other during the removal process, the biasing force of the spring 102 causes the flange 116 to be pulled away from the spindle 2. A small amount is extruded and the flange 1
16 is fitted into the hole 96. Therefore, the operator must open the hole 9 while keeping the flange 116 in the above-mentioned phase.
This saves the effort of pulling the holder body 8 out to the side 6, and the work of removing the holder body 8 becomes easier.

In addition to the above, the present invention can be implemented with various changes and improvements without departing from the scope of the claims for utility model registration, such as the possibility of integrally forming the fixed bush and the spindle. Of course.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view (partially non-sectional) of a cutting tool holding device which is an embodiment of the present invention, and Fig. 2 is a plan sectional view showing a state in which the holder main body etc. are held by the spindle. be. 3 and 4 are a partially cutaway front view and a plan view of the holder main body of the device, and FIGS. 5 and 6 are a left side view and a right side view of FIG. 4, respectively. 7 and 8 are a partially cutaway front view and a side view of the clamp nut in the same device, and FIGS. 9 and 10 are a front view and a partially cutaway view of the anti-rotation sleeve in the device. It is a notch side view. FIG. 11 is a partial sectional view showing a part of the device, FIGS. 12 and 13 are side sectional views and front views of the fixing bush in the device, and FIGS. 14 and 15 are FIG. 2 is a partially cutaway front view and a right side view showing a locking member (a state before pin press-fitting) in the same device. FIG. 16 is a plan sectional view showing a state in which a cutting tool holding device according to another embodiment of the present invention is held on a spindle;
FIG. 17 is a front view of the fixed bushing attached to the spindle shown in FIG. 16. 18 and 19 are a front view and a side sectional view, respectively, showing the spring receiver fitted in the fixing bush shown in FIG. 17, and FIG. 20 is a right side view of the holder main body in the device shown in FIG. 16. It is a diagram. 2: Spindle, 4: Tip surface (torque load receiving surface), 6: Center hole (spindle hole), 8: Holder body, 14: Torque transmission member, 16: Drive pin, 20: Adjustment screw, 22: Collet, 24 : Clamp nut (the above members 8 to 24 constitute a tool holder), 28, 116: Flange, 30:
Flange end surface (thrust load transmission surface), 32: Anti-rotation sleeve, 34: Anti-rotation protrusion, 36, 4
0: Engagement notch, 38, 102: Spring, 4
2, 92: Fixed bush, 52: Locking member, 6
6: disc spring (biasing means), 70: locking pin (locking part), 76: inner flange, 78: flange hole,
80: Fitting notch (76 to 80 above constitute the locked part), 96: Hole, 98: Bottomed hole, 100:
Spring holder, 114: Protrusion.

Claims (1)

[Claims for Utility Model Registration] (a) A central hole opening at the tip, and a first retainer cut in the axial direction from the annular tip surface surrounding the opening of the center hole and having a constant width in the circumferential direction. a drive shaft including a mating notch and a first member of a bayonet joint; (b) a fitting portion that fits with the center hole so that it can move relative to the center hole in the axial direction and rotate relative to the center hole; (c) a tool holder comprising a second member that engages and disengages from the first member of the bayonet joint by relative rotation; and a cutting tool holder that holds a rotary cutting tool; It is fitted to the outside relatively unrotatably and relatively movable in the axial direction between a working position and a non-working position, and is engaged with the first engagement notch in the working position and the first engagement notch in the non-working position. (d) a detent sleeve having a detent protrusion that disengages from the engagement notch; a biasing means for allowing the tool to move to the non-operating position when the cutting tool holder is moved to the non-operating position; A second engagement notch having the same width as the first engagement notch and passing through the flange is provided in a portion of the flange facing the first engagement notch, and the rotation prevention protrusion of the rotation prevention sleeve is provided. In the working position, it engages with both the first engagement notch and the second engagement notch, and in the non-working position, it has a length that separates from the first engagement notch and engages only the second engagement notch. A cutting tool holding device comprising: