JPS6254613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stub holder for attaching and detaching a rotary tool such as a drill to a rotating main shaft of a machine tool.

This type of stub holder is inserted into the shaft hole of the rotating spindle of a machine tool and is fixed in a state where torque is transmitted from the rotating spindle to the stub holder, but it is easy to attach and detach from the rotating spindle. Various types of stub holders have been proposed to enable rapid operation, but all require a specific structure for fixing the stub holder on the rotating main shaft side. Therefore, conventional stub holders can only be used in machine tools that have a rotating spindle with a specific stub holder mounting structure, and have the disadvantage of lacking in versatility.

Conventional general structures for mounting a stub holder on the rotating spindle side include a structure that requires a keyway in the rotating spindle shaft hole, and a structure that requires a keyway in the rotating spindle shaft hole, and a structure that requires a keyway in the rotating spindle shaft hole,
As shown in No. 54246, a structure requiring a locking groove for preventing rotation on the end face of the rotating main shaft is well known.
Therefore, the present invention proposes a versatile stub holder that can be easily and quickly attached to and detached from a rotating spindle having either of these two types of general stub holder attachment structures.

Hereinafter, preferred embodiments of the present invention will be described based on the attached illustrative figures.

In Figures 1 and 2, reference numeral 1 denotes a rotating main shaft on the machine tool side, and its tip face 1a is open, and a shaft hole 2 is concentrically drilled toward the depth side in the axial direction. has. Reference numeral 3 denotes a stub holder of the present invention, which includes a holder main body retainer 4 which is installed inside the rotary main shaft hole 2 on the depth side thereof, and a holder main body retainer 4 which is installed adjacent to the tip end side of the holder main body retainer 4 and which is installed at the tip end. The holder body 6 has a chuck 5 for attaching a tool. The holder body retainer 4 is the second
As shown in the figure, it consists of a retainer body 8 having a holder body locking part 7 on the circumferential portion adjacent to the holder body 6, and a fixing means 9.
As shown in FIG.
and a bolt 13 for compressing and expanding the diameter of the disc spring 10 between the two. The outer diameters of the stopper main body 8, the receiving plate 11, the presser plate 12, and the disc spring 10 in the initial state are configured to be slightly smaller than the inner diameter of the rotating main shaft shaft hole 2, and the receiving plate 11 A cylindrical shaft portion 1 passing through the center of the stopper body 8
1a, and the bolt 13 is provided with this cylindrical shaft portion 11a.
, and its tip is connected to the screw hole 12 of the presser plate 12.
It is screwed into a. Reference numeral 14 denotes a washer interposed between the head 13a of the bolt 13 and the cylindrical shaft portion 11a, and between this washer 14 and the inner wall surface of the retainer main body 8, the retainer A disc spring 15 is interposed to press the main body 8 toward the receiving board 11 side. Reference numeral 16 denotes a key that is removably fitted into a key fitting recess 17 (FIG. 3) provided in the retainer main body 8, and is formed along the inner circumferential surface of the rotating main shaft hole 2 in the axial direction. It fits into the keyway 18 that is provided. Reference numeral 19 denotes a C-shaped pin which is detachably fitted into a pin hole 20 provided on the outer circumferential surface of the presser plate 12, and whose tip protrusion fits loosely into the keyway 18 of the rotating main shaft hole 2. The holder main body locking portion 7 formed on the retainer main body 8 is constituted by L-shaped notch grooves formed at two mutually opposing locations in the cylindrical surrounding wall 8a.

As shown in FIGS. 1, 2, and 4, the holder body 6 has the holder body locking portion 7.
A locked part 21 that engages with the locking part 21 is provided on the peripheral part of the side adjacent to the retainer 4, and
The portion between the flange portion 22 that comes into contact with the flange portion 22 and the locked portion 21 is configured to have a diameter that allows the portion to be inserted into the rotating main shaft hole 2 without large play.

Reference numeral 23 denotes a rotation-preventing locking piece that can be fitted into the end of the keyway 18 that opens in the distal end surface 1a of the rotating main shaft 1, and is a locking piece that can be fitted into the axial notch 22a provided in the flange 22. It fits into a key groove 24 formed on the outer circumferential surface of the holder main body 6 at this position so as to be movable within a certain range in the axial direction. Reference numeral 25 denotes a ring for operating the rotation prevention locking piece 23, which loosely fits into the flange portion 22, is coupled to the rotation prevention locking piece 23 by a fixing screw 26, and is attached to the inner peripheral flange portion 25a. is biased in the axial direction by a compression coil spring 28 interposed between the spring receiving washer 27 and the spring receiving washer 27 so as to abut against the flange portion 22 . The locked portion 21 is comprised of L-shaped protrusions protruding from two circumferentially opposing positions at the end of the holder body 6, and is connected to the locking portion 7 of the holder body retainer 4. By rotating them in the setting direction around the shaft while they are fitted in the axial direction, the bent end portion of the locked portion 21 and the back end of the L-shaped notch groove of the locking portion 7 are aligned axially with each other. engages a state that prevents disengagement in the direction;

29 is a tool stopper;
As shown in FIG. 5 and FIG. 5, there is a stopper body 31 having an outer diameter that can be inserted into the tool stopper interior hole 30 provided concentrically in the center of the holder body 6 without large play, and this stopper body 3.
1, and an adjustment bolt 33 screwed into a central screw hole 32 (FIG. 1) opened at the inner end of the tool stopper. , is inserted into the internal hole 30 of the tool stopper. A tool holding slit 34 is provided at the front end of the stopper body 31.
is formed, and a key groove 3 is formed on the outer peripheral surface parallel to the axial direction.
5 is provided. 36 is a screw for fixing the tool stopper, which is inserted into the screw hole 3 of the holder main body 6.
7 (FIG. 4), and the inner end fits into the keyway 35 of the stopper main body 31. Note that the bottom 30a of the tool stopper internal hole 30 has
A through hole 38 is provided which can be used to operate the bolt 13 of the holder body retainer 4.

The tool mounting chuck 5 is of a conventional type, consisting of a rubber collet 39 and a tightening nut 40.

Stub holder 3 configured as above
can be used in the following manner for a rotating main shaft 1 provided with a keyway 18 as shown in FIG. That is, before inserting the key 16 into the shaft hole 2,
is fitted into the key fitting recess 17 of the stopper main body 8, and the pin 19 is inserted into the pin hole 20 of the holding plate 12.
(Fig. 3), the holder body locking part 7 and the locked part 21 of the holder body 6 are engaged with each other as described above, and then Assemble the stub holder 3 with the tool mounting chuck 5 and tool stopper 29 removed, and in this state, next attach the pin 1.
9 and the key 16 are inserted into the shaft hole 2 of the rotating main shaft 1 so that they fit into the key groove 18. Then, with the flange portion 22 of the holder main body 6 in contact with the distal end surface 1a of the rotary main shaft 1, and the rotation preventing locking piece 23 fitted into the end of the keyway 18 opening on the rotary main shaft distal end surface 1a, the holder is opened. Using the tool stopper interior hole 30 of the main body 6 and its bottom through-hole 38, insert a bolt operating tool such as a hex wrench or screwdriver with a shaft foot of the required length into the holder main body retainer 4, and then insert the tool into the holder main body retainer 4. The tool rotates the bolt 13 in the tightening direction while the bolt 13 is fitted into a square hole or the like provided in the head 13a of the bolt 13.

By tightening the bolt 13, the holding plate 12 of the holder body retainer 4 is drawn toward the receiving plate 11, and the disc spring 10 compressed between the two is deformed and expanded in diameter. Therefore, the outer circumferential edge of the disk spring 10 presses into the inner circumferential surface of the rotary main shaft hole 2 so that the holder main body retainer 4 is fixed in the shaft hole 2 of the rotary main shaft 1.

In addition, when fixing this holder body retainer 4, use a bolt operation tool to press the bolt 13 toward the depth side of the rotating main shaft shaft hole 2, and pull it in the direction to pull out the holder body 6 protruding from the shaft hole 2. By doing so, the retainer body 8 and the receiving plate 11 which are combined with the holder body 6 are connected to the disk spring 1.
5 and can be spaced slightly apart from each other.
In this state, the flange portion 22 of the holder body 6 is brought into contact with the tip end surface 1a of the rotating main shaft 1, and the bolt 13 is tightened as described above to deform and expand the diameter of the disc spring 10, and the holder body retainer 4 is fixed. For example, a slight gap is created between the retainer body 8 and the receiving plate 11, and the restoring force of the disc spring 15 transmitted from the retainer body 8 to the holder body 6 pushes the holder body 6 into the shaft hole 2. By pulling in the insertion direction, the flange portion 22 can be brought into pressure contact with the leading end surface 1a of the rotating main shaft.

Once the holder main body retainer 4 is fixed at a predetermined position in the rotary main shaft hole 2 as described above, the rotation stopper 23 is moved backward together with the operation ring 25 against the spring 28 to lock the rotation stopper 4. With the locking piece 23 removed from the end of the keyway 18, use the operation ring 25 to remove the holder main body 6, and the inner end locked portion 21 of the holder body 6 is removed from the locking portion 7 on the retainer 4 side. By rotating the holder main body 6 in the reset direction, only the holder main body 6 can be removed from the rotating main shaft hole 2. By separating the holder main body 6 from the stopper 4 and pulling it out in this way, the stopper main body 8 moves toward the depth side in the axial direction by the restoring force of the disc spring 15 and comes into contact with the receiving plate 11.

Holder body 6 pulled out from rotating spindle shaft hole 2
Insert the tool stopper 2 into the inner hole 30 of the tool stopper.
9 and screw hole 37 (fourth
A fixing screw 36 is screwed into the hole shown in FIG. Next, the tool mounting chuck 5 is attached, and a prescribed tool 41 is inserted from the chuck 5 into the holder body 6 as shown by the imaginary line in FIG. Match.
At this time, the bolt 33 of the tool stopper 29 is inserted into the through hole 38 of the tool stopper interior hole bottom 30a so that the amount of protrusion of the tool 41 is a predetermined dimension. The stopper body 31, which is prevented from rotating by the fit between the inside of the fixing screw 36 and the keyway 35, is moved in and out of the bolt 33 by rotating it using a hexagonal hole etc. provided in the head 33a of the bolt 33. I can do it. When the amount of protrusion of the tool 41 has been adjusted, the fixing screw 36 is further tightened to fix the stopper body 31 to the holder body 6, and the tightening nut 40 of the chuck 5 is tightened to attach the tool 41 to the holder body 6. Fixed to.

Once the tool 41 is set in the holder body 6 as described above, the holder body 6 is placed in the shaft hole 2 of the rotating main shaft 1, and the locking part 21 is fixed in the shaft hole 2 using a retainer. Insert it so that it fits into the locking part 7 of 4. At this time, the rotation-stopping locking piece 23 is in a position offset in the circumferential direction with respect to the open end of the keyway 18, and the spring 22 together with the operating ring 25
8 and is in contact with the rotating main shaft end surface 1a in a retracted state. Next, using the operating ring 25, move the holder main body 6 so that the inner end locked part 21 is attached to the retainer 4.
The retainer main body 8 is rotated in the set direction to engage the locking portion 7 of
Due to the restoring force of The locking portion 7 on the stopper 4 side is slightly shifted toward the depth side in the axial direction. Therefore, from this state, the holder body 6
By rotating in the direction of the arrow, that is, in the setting direction, the locked part 21 becomes chamfered corner parts 21a, 7a ( (Only one side may be chamfered)
As shown by the imaginary lines in the figures and Fig. 7, the disc spring 1
It is fitted into the locking part 7 in a state where it is pulled out in the axial direction (in the direction indicated by the arrow) against the pressing force 5. By rotating the holder main body 6 in this manner and completely engaging the locked portion 21 of the holder body 6 with the locking portion 7 of the retainer 4, the rotation locking piece 23 is attached to the end of the keyway 18. As a result, the rotation-stopping locking piece 23, which moves forward by the restoring force of the spring 28, automatically fits into the end of the keyway 18 and locks the holder main body 6.

The tool 41 attached to the rotating main shaft 1 via the stud holder 3 as described above is driven in a predetermined direction by the rotation of the rotating main shaft 1. The holder body 6 rotates in the reset direction. The rotational force of the rotating main shaft 1 is as follows: rotating main shaft 1→key 16→
Stopper body 8 → locking part 7 → locked part 21 → holder body 6 → chuck 5 → torque transmission system leading to tool 41, rotation main shaft 1 → rotation stopper locking piece 23
The torque is transmitted to the tool 41 via a torque transmission system that extends from → holder body 6 → chuck 5 → tool 41.
The rotational force is also transmitted from the holder body 6 to the tool 41 via a torque transmission system from the holder body 6 to the tool stopper fixing screw 36 to the stopper body 31 to the slit 34 to the tool 41.

As mentioned above, a predetermined process is performed using the tool 41 which receives the rotational force from the rotating main shaft 1 and rotates together with the rotating main shaft 1. At this time, the holder main body 6 15, and the flange portion 22 is in pressure contact with the end surface 1a of the rotating main shaft 1 even in the no-load state, so that the shaft that acts on the tool 41 at the start of machining. The tool 41 will not move backward together with the holder body 6 even by a slight amount due to the directional reaction force.

The fixing means 42 of the holder main body slip-off retainer 4 shown in FIG. Holder plate 1 of fixing means 9
2, a screw hole 4 into which the bolt 13 is screwed;
A cone 45 having a cone 4 in the center and fitting inside the C-shaped ring 43 is used. Therefore, according to this fixing means 42, the cone 45 that moves toward the receiving plate 11 side by tightening the bolt 13 expands the diameter of the C-shaped ring 43, and the outer peripheral surface 43b of the C-shaped ring 43.
comes into pressure contact with the inner circumferential surface of the rotating spindle shaft hole 2. Such a fixing means 42 can be used in place of the fixing means 9. Note that although the key 16 is not shown in the drawing, the key 16 is not an essential requirement.

The stub holder 3 shown in FIG. 1 is provided with locking grooves 47 for preventing rotation at two locations in the diametrical direction of the end face 46a as shown in FIG. 9A, and a key groove 18 as shown in FIG. When using the rotating main shaft 46 that does not have a
Then, the pin 19 may be removed, or a retainer 4 that does not have a member that fits into the keyway 18 may be used from the beginning, for example, as shown in FIG. 8B. In this case, the rotation-preventing locking piece 23 is fitted into the rotation-preventing locking groove 47 of the rotating main shaft end surface 46a. The rotational force of the rotating main shaft 46 is
The holder main body 6 is
However, in such a case,
As shown in FIG. 9B, a pair of rotation-preventing locking pieces 23 that fit into the two rotation-preventing locking grooves 47, respectively.
It is desirable to provide a and 23b. 24a,
24b is a keyway, and 26a and 26b are screws for fixing the locking piece.

When fitting the rotation stopper locking pieces 23a, 23b into the rotation stopper locking groove 47 of the rotating main shaft end face 46a as described above, these rotation stopper locking pieces 23a,
23b can be made larger to match the rotation stopper locking groove 47, but the rotation stopper locking pieces 23a, 23
By removing one of the parts b, it is also possible to configure it so that it can be used as it is for the rotating main shaft 1 having the keyway 18.

The stub holder of the present invention can be implemented and used as described above, and the stub holder is located in a shaft hole provided in the rotating main shaft from its tip face toward the axial depth side. A holder main body retaining tool is installed inside the holder body, and a holder main body is installed adjacent to the distal end side of the holder body and has a chuck for attaching a tool at the distal end thereof, and the holder main body retaining tool is adjacent to the holder main body. A stopper body is provided with a holder body locking part on the periphery of the holder body, and a central through hole (in the embodiment, a tool stopper internal hole 30 and a bottom through hole) is provided through the holder body in the axial direction of the central part thereof. A screw shaft (bolt 13 in the embodiment) that can be operated through the hole 38) and a circumferential friction fixture (disc spring in the embodiment) whose diameter is enlarged by rotation of the screw shaft and press against the inner circumferential surface of the rotary main shaft hole. 10 or a C-shaped ring 43), the holder body has a locking part that engages in a retaining state by relative rotation with respect to the holder body locking part to the retainer. A rotation-preventing locking piece is provided on the circumferential portion of the adjacent side, engages in a position protruding from the rotating main shaft shaft hole so as to be relatively movable within a certain range only in the axial direction, and is biased toward the rotating main shaft side by a spring. This rotation-preventing locking piece is engaged with an axial tip of a key groove formed on the inner circumferential surface of the rotating main shaft or a locking groove formed on the tip surface of the rotating main shaft. A rotating main shaft with a keyway on the inner circumferential surface,
Since it can be attached to any rotating main shaft that has a locking groove for preventing rotation on the tip end surface, it can be conveniently used as a versatile stub holder.

Moreover, once the holder main body retainer is fixed at a predetermined position in the shaft hole of the rotating main shaft via the fixing means, the holder main body that grips the tool can be rotated in the reset direction by moving the rotation stopper piece backward. Since the holder body can be removed by simply pushing it in and turning it in the set direction, the holder body can be attached and detached very easily and quickly.

[Brief explanation of the drawing]

Figure 1 is a longitudinal side view in use, Figure 2 is a plan view showing the holder body, holder body retainer, and tool stopper, Figure 3 is an exploded perspective view of the holder body retainer, and Figure 4 Figure 5 is an exploded perspective view of the main part of the holder body, Figure 5 is an exploded perspective view of the tool stopper, and Figure 6 is the state before the locking part on the retainer side and the locked part on the holder body side are engaged. FIG. 7 is a longitudinal cross-sectional side view of the main part in the same state, FIG. FIG. 9A is a perspective view of the end of the rotating main shaft with a locking groove for preventing rotation on the end surface, and FIG. It is a diagram. 1, 46... Rotating main shaft, 2... Shaft hole, 3... Stub holder of the present invention, 4... Holder main body retainer, 5... Tool mounting chuck, 6... Holder main body, 7... Holder Main body locking part, 8...
Retainer body, 9, 42...fixing means, 10,
15... disc spring, 12... presser plate, 16... key, 18, 24, 24a, 24b, 35... key groove, 21... locked part, 22... flange part, 2
3, 23a, 23b... Rotating locking piece, 25...
...Operation ring, 26, 26a, 26b, 36...
Fixing screw, 28... Compression coil spring, 2
9... Tool stopper, 30... Tool stopper interior hole, 31... Stopper body, 33... Tool protrusion adjustment bolt, 34... Tool holding slit, 39... Rubber collet, 40... Tightening nut, 41...Tool, 43...C-shaped ring,
45... Cone, 47... Locking groove for preventing rotation.

Claims (1)

[Claims] 1. A holder body retainer installed in the shaft hole provided on the rotating main shaft from its tip face toward the axial depth side, and a holder body retainer installed in the axial depth side of the shaft hole, and a holder body retainer installed adjacent to the tip side from the shaft hole. and a holder body having a chuck for attaching a tool at the tip thereof, and the holder body retaining device includes a retaining device body having a holder body locking portion on a peripheral portion of the side adjacent to the holder body; A screw shaft that can be operated through a central through-hole provided in the axial direction of the center of the holder body, and a circumferential friction fixing whose diameter is expanded by rotation of the screw shaft and presses against the inner peripheral surface of the rotating main shaft hole. the holder body has a locking portion that is engaged in a retaining state by relative rotation with respect to the holder body locking portion, and a peripheral portion of the holder body adjacent to the retainer; A stub comprising a rotation-preventing locking piece that is engaged with a portion protruding from the rotating main shaft hole so as to be relatively movable within a certain range only in the axial direction, and is biased toward the rotating main shaft by a spring. holder.