JP2520864Y2 - Chuck changer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] This invention is a chuck exchanging device in which a manually-operated chuck attaching means is provided on a spindle of a lathe, and various kinds of separate chucks can be freely exchanged and attached. It is about.

[Conventional technology]

In the chuck of the lathe, a claw driven by power such as hydraulic pressure is provided at the tip of the spindle provided on the head stock,
2. Description of the Related Art An automatic chuck exchanging apparatus in which various kinds of separate chucks are detachably fixed to chuck attaching means by these claws so as to lathe various kinds of works is known.

There is also a chuck exchange device by manual tightening as shown in FIG.

In this figure, 1 is a flange fixed to the front end of a main shaft of a lathe (not shown), 2 is a chuck mounting means provided at the tip of the flange 1, and drives the main body 4, the grasping claw 3, and the grasping claw 3. It has a female screw ring 5 for

The main body 4 has a cylindrical shape concentric with the flange 1 and has an annular recess 7 formed concentrically at the front thereof. The female screw ring 5 is rotatably fitted in the recess 7.

The female screw 14 on the inner periphery of the female screw ring 5 is screwed onto the male screw 15 on the outer periphery of the advancing / retreating cylinder 6 having the rear portion fitted in the recess 7.

The advancing / retreating cylinder 6 is not rotatable with respect to the main body 4 and is only advancing / retracting freely by a detent means not shown.

An annular wall 8 is concentrically and integrally protruded from the front portion of the main body 4, and the outer periphery of the annular wall 8 and the inner peripheral surface of the recess 7 are aligned with each other. The outer circumference of the advancing / retreating cylinder 6 is in contact with the inner circumference of the front lid 10 fixed to the front part of the main body 4.

Further, the grasping claws 3 are integrally provided on the outer periphery of the distal end of the advance / retreat cylinder 6 at a constant interval.

Reference numeral 11 denotes a recess provided so as to reach the recess 7 from a part of the outer periphery of the main body 4. A small hand-held bevel gear 12 is rotatably fitted into the recess 11, and the bevel gear 12 is connected to the female screw. The ring 5 is engaged with the rear bevel gear 13.

Reference numeral 21 is a chuck mounting adapter, on the front surface of which various types of power chucks 22 of various types are fixed by means such as bolting. Therefore, although the chucks 22 are of various types, the adapter 21 is of one type and has the same size. The rear portion of the adapter 21 is provided with a recess 23 into which the inner end of each gripping claw 3 is detachably engaged, and the rear inner surface of the recess 23 has a plurality of engagements to engage with each gripping claw 3. The claws 17 are formed at regular intervals.

Further, a high precision coupling is provided in the recess 23 of the adapter 21.
24 is fixed, and radial irregularities that engage with the radial irregularities on the front surface of the high-precision coupling 18 fixed to the front surface of the main body 4 are provided, and the chuck 22 is positioned by the engagement of both irregularities.

Reference numeral 25 is a joint member fixed to the tip of the draw bar 20 in the center hole of the lathe spindle.

The joint member 25 has a cylindrical shape, and a concave hole 26 is provided at the tip thereof, and a plurality of engaging claws 27 are formed on the inner circumference of the concave hole 26. 28 is a chuck claw operating shaft that projects rearward from the center of the rear part of the chuck 22, and this shaft 28 and each chuck claw are
The chucks are interlocked with each other by a link mechanism or the like provided inside, and each chuck claw is moved inward and outward at the same time as the operation shaft 28 moves back and forth. A plurality of engaging claws 29 are provided at the rear end of the operation shaft 28, and the engaging claws 27 are engaged with and disengaged from the engaging claws 29.

In the case of the above-mentioned conventional example, as shown in the same figure, the square shaft portion of the handle is inserted into the square hole at the outer end of the small bevel gear 12 while the engagement claw 17 of the adapter 21 and the grasping claw 3 are engaged. Then, when this is rotated in the tightening direction, the bevel gear 13 meshing with the bevel gear 12 is engaged.
Rotates together with the female screw ring 5, and the rotation of the female screw 14 causes the advancing / retreating cylinder 6 to retreat, and the grasping claw 3 integrated with this pushes the engaging claw 17 against the front lid 10 of the main body 4 to move the adapter 21 of the main body 4. Secure to the front.

[Problems to be solved by the device]

In the case of the known automatic chuck exchanging device as described above, a forward / backward shaft for driving the pawl of the chuck mounting means is provided in the main shaft of the lathe, and a forward / backward shaft for driving the power chuck is attached to the chuck mounting means. There is a problem that the mechanism becomes extremely complicated because a book is required and each drive cylinder needs to be provided at the rear portion of the main shaft.

Further, in the case of the conventional example of FIG. 7, the drawbar 20 is joined to the joint member 25 to engage and disengage the engaging pawl 27 of the joint member 25 at the tip of the drawbar 20 and the engaging pawl 29 of the chuck pawl operating shaft 28.
There is a problem that a mechanism such as rotating with 25 is required.

An object of the present invention is to solve the above-mentioned problems of the conventional device and to provide a convenient chuck exchanging device capable of simultaneously setting an adapter having a chuck attached thereto and connecting a chuck claw operating shaft and a draw bar. .

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention is to move the advancing / retreating cylinder in the axial direction through the male screw by the rotation of the female screw ring, and by the advancing / retreating, the chuck attaching means is provided through the grasping claw. In a chuck exchange device that attaches and detaches a chuck attachment adapter or chuck to the main body of, the advance / retreat cylinder is made rotatable around its axis, and its rotation range is limited to the set position and non-set position of the adapter. Means is provided, the tip of the drawbar penetrating the inside of the main shaft is provided with a joint member that rotates with the advancing / retreating cylinder and advances / retreats with the drawbar, and the chuck claw operating shaft protruding from the rear part of the adapter or the chuck,
When the engaging claw of the adapter or the chuck is fitted between the grasping claws at the forward position of the advancing / retreating range of the advancing / retreating cylinder and is behind the grasping claw, between the engaging claws of the joint member at the forward position. An engaging claw that is fitted and located at the back of the engaging claw is provided, and the engaging claw of the adapter or the chuck is fitted between the grasping claws at the non-setting position of the advancing / retreating cylinder, and The engaging claw of the chuck claw operating shaft can be positioned on the back part and can be positioned on the back part of the engaging claw by fitting between the engaging claws of the joint member, and the advancing / retreating cylinder can be set from the non-setting position. When rotated to the position, the respective claws are engaged with each other so that they can move back and forth integrally (claims (1) and (2)).

In the invention of this structure, an annular coupling having radial engaging irregularities is fixed concentrically on the front surface of the main body, and a radial surface engaging with the engaging irregularities of the coupling is provided on the rear surface of the adapter or chuck. Or an annular fitting portion having a positioning outer peripheral surface concentric with the main body is provided on the front surface of the main body. Alternatively, a fitting portion having an inner peripheral surface that closely fits the outer peripheral surface for positioning is also provided concentrically on the rear surface of the chuck, and a part of the front surface of the main body is engaged with a concave hole on the rear surface of the adapter or the chuck. Then, the drive pin for integrally connecting the main body and the adapter or the chuck in the rotational direction may be fixed (claim (4)).

Further, in the invention of each of the above-mentioned constitutions, a set confirmation rod is inserted into a radial hole provided in a part of the main body of the chuck attachment means so as to be able to advance and retreat, and an inner end of the set confirmation rod is provided at a rear end of the advance and retreat cylinder. Provide a spring to crimp the fixed ring,
When the advancing / retreating cylinder is in the non-set position on the outer circumference of the ring, the inner end of the set confirmation rod may be fitted to form a groove for retracting the outer end of the set confirmation rod from the outer periphery of the main body (claim) Item (5)).

[Action]

Since the present invention has the above-mentioned configuration, when the main shaft is stopped and the advancing / retreating cylinder is at the retracted position, the male screw of the advancing / retreating cylinder is rotated by manually turning the female screw ring in the main body in the loosening direction. By the rotation of the female screw with respect to, the advancing and retracting cylinder first rotates together with the female screw from the set position to the non-set position, the rotation limiting means prevents the rotation at the non-set position, and then advances. , Grasping claws loosen.

With the slack of each gripping claw, the adapter to which the desired chuck is attached or the engaging claw of the chuck is fitted between the gripping claws on the front part of the main body and positioned at the back, and at the same time, the chuck claw operating shaft After fitting the engaging claws between the engaging claws of the joint member and positioning them on the back, rotate the female screw ring in the tightening direction.First, the advancing / retracting cylinder and the joint member together with the female screw ring reach the set position. By rotating, the grasping claw of the advancing / retreating cylinder and the engaging claw of the joint member rotate around and engage behind the engaging claw of the adapter or the chuck and the engaging claw of the chuck claw operating shaft, respectively, by the rotation limiting means. The rotation of the advancing / retreating cylinder and the joint member stops.

Furthermore, if the female screw ring continues to rotate in the tightening direction, the advance / retreat cylinder retracts due to the rotation of the female screw with respect to the male screw, and the grasping claws tighten the engaging claws of the adapter or chuck to secure the adapter or chuck to the main body. To do.

At this time, according to the invention as set forth in claim (3), when the adapter or the chuck is mounted, the unevenness of the coupling of the adapter or the chuck is engaged with the unevenness of the coupling of the main body, and at the same time, the engagement of the adapter or the chuck is engaged. The claws are fitted between the grasping claws on the front part of the main body, and in the invention of claim (4), when the engaging claws of the adapter or the chuck are fitted between the grasping claws on the front part of the body, the claws are positioned for positioning. The outer peripheral surface and the drive pin are fitted to the inner peripheral surface for positioning of the adapter or the chuck and the concave hole.

Further, in the invention of claim (5), when the advancing / retreating cylinder is rotated to the set position as described above, the set confirmation rod is pushed out against the spring at the outer periphery of the ring at the rear end to display the completion of the set.

After that, when the advancing / retreating cylinder turns to the non-set position, the inner end of the set confirmation rod enters the groove on the outer circumference of the ring by the spring and its outer end is pulled in from the outer circumference of the main body to indicate that it is in the non-set state. To do.

〔Example〕

In the first embodiment shown in FIGS. 1 to 4, 31
Is a flange fixed to the front end of the spindle 30 of the lathe, 32 is a chuck mounting means provided on the front surface of the flange 31, and has a main body 34, a grasping claw 33, and a female screw ring 35 for driving the grasping claw 33. There is.

The main body 34 has a cylindrical shape concentric with the flange 31, and an annular recess 37 is concentrically formed in the front portion of the main body 34. The female screw ring 35 is rotatable in a ring 38 fixed in the recess 37. It is fitted so that it cannot be moved back and forth.

The female screw 36 on the inner circumference of the female screw ring 35 is formed in the recess.
It is screwed onto a male screw 40 on the outer circumference of an advancing / retreating cylinder 39 having a rear portion fitted in 37.

At the rear end of the advance / retreat cylinder 39, a ring 41 having a diameter larger than the male screw 40 is used.
A pin that is fixed to the rear part of this ring 41
42 is loosely fitted in the arcuate groove 43 on the rear surface of the recess 37, and
Allows to rotate in the range of 45 ° and to move back and forth in a small range.

An annular wall 45 having an L-shaped cross section is concentrically fixed to the front portion of the main body 34, and a rubber ring 46 is attached to the outer peripheral rear portion thereof.

Further, the grasping claws 33 are integrally provided on the outer periphery of the front end of the advancing / retreating cylinder 39 at a constant interval.

Reference numeral 47 is a concave hole provided so as to reach the concave portion 37 from a part of the outer periphery of the main body 34. A hand-held small bevel gear 48 is rotatably fitted in the concave hole 47, and the bevel gear 48 is fitted with the female screw. The bevel gear 49 on the rear side of the ring 35 is engaged.

Reference numeral 50 is a chuck mounting adapter, on the front surface of which various types of power chucks 51 of various types are fixed by means such as bolting. Therefore, although the chucks 51 are of various types, one type of the adapter 50 has the same size. The rear portion of the adapter 50 is provided with a recess 52 into which the inner end of each grasping claw 33 is detachably engaged. The inner surface of the rear portion of the recess 52 has a plurality of engagements to engage with each grasping claw 33. The claws 53 are formed at regular intervals.

Further, the high precision coupling 55 is fixed in the annular concave portion 54 on the outer periphery of the rear surface of the adapter 50, and radial irregularities are provided to engage with the radial irregularities on the front surface of the high precision coupling 56 fixed to the front surface of the main body 34. The chuck 51 is positioned by engaging the concave and convex portions.

Further, an annular wall 58 covering the outer periphery of the annular wall 45 is provided on the outer periphery of the rear portion of the adapter 50, and a slope 59 at the rear end of the inner periphery of the annular wall 58 is attached to the rubber ring 46 by pressure when the adapter 50 is attached to the inside. It is designed to prevent the entry of dust.

Reference numeral 61 denotes a joint member which is rotatably connected to the tip of the draw bar 60 in the center hole of the lathe spindle 30 so as to advance and retreat together.

The joint member 61 has a cylindrical shape, a concave hole 62 is provided at the tip thereof, and a plurality of engaging claws 63 are formed on the inner periphery of the front end of the concave hole 62. Reference numeral 65 is a chuck claw operating shaft that projects rearward from the center of the rear part of the chuck 51. The shaft 65 and each chuck claw 64 are interlocked by a link mechanism or the like provided in the chuck 51 to operate the operating shaft.
With the forward / backward movement of 65, each chuck claw 64 moves at least inward and outward. A plurality of engaging claws 66 are provided at the rear end of the operation shaft 65, and the engaging claws 63 are engaged with and disengaged from the engaging claws 66.

A key 67 is integrally provided on a part of the outer circumference of the front end of the joint member 61, and the key 67 is slidably engaged with a key groove 68 on the inner circumference of the advance / retreat cylinder 39.

Reference numeral 70 in FIGS. 1 and 4 denotes a set confirmation rod, which is inserted into a radial hole 71 formed in a part of the main body 34 so as to be able to move forward and backward.

A screw cylinder is used for the female screw on the outer end of the large-diameter portion 72 on the outer side of the hole 71.
73 is screwed and fixed, the outer end of the confirmation rod 70 is inserted into the screw cylinder 73, and a push spring 75 is attached between the inner end of the screw cylinder 73 and the collar 74 provided in the middle of the rod 70. Then, the pushing spring 75 presses the inner end of the rod 70 against the outer circumference of the ring 41.

Further, a groove 76 in the circumferential direction is formed on the outer periphery of the ring 41, and the rod 70 is grooved only when the ring 41 is in the set position, that is, when the grasping claw 33 and the engaging claw 53 are engaged. It is pushed out from 76 so that the outer end of the rod 70 coincides with the outer end of the screw cylinder 71.

To explain the operation of the first embodiment, the pin 42 provided on the ring 41 at the rear end of the advancing / retreating cylinder 39 has an arcuate groove 43 as shown in FIG.
And the front part of the ring 41 is advanced to the rear end of the female screw ring 35, a sufficiently open non-set position is provided between the rear side of the grip claw 33 and the front side of the ring 38. There is.

Further, at this time, as shown in FIG. 4 II, since the inner end of the set confirmation rod 70 is in the groove 76 of the ring 41, the outer end of the rod 70 is in the retracted and unset state.

In this state, the engaging claws 53 of the adapter 50 are inserted from between the grasping claws 33 of the advancing / retreating cylinder 39, and the couplings 55, 56
The projections and depressions are engaged, and at the same time, the engagement claws 66 at the rear end of the chuck claw operation shaft 65 are also inserted from between the engagement claws 63 of the joint member 61.

Next, when the small bevel gear 48 is turned in the tightening direction by the handle engaged with the polygonal hole at the outer end of the bevel gear 49, the bevel gear 49 starts to rotate counterclockwise with the female screw ring 35 as shown in FIG.
At this time, since the ring 41 is in contact with the rear side of the bevel gear 49, the advancing / retreating cylinder 39 is also rotated by the friction between the ring 41 and the bevel gear 49.

Further, the joint member 61 is also rotated through the key 67 and the key groove 68. As described above, when the advancing / retreating cylinder 39 starts to rotate and turns by 45 °, the pin 42 moves below the arcuate groove and cannot rotate any more.

When the advancing / retreating cylinder 39 is rotated by 45 ° as described above, as shown in FIG. 3, the grasping claw of the advancing / retreating cylinder 39 is provided on the back of the engaging claw 53 of the adapter 50.
33 turns, and a joint member is attached to the back of the engaging claw 66 of the operating shaft 65.
The engaging claw 63 of 61 rotates.

As described above, the advancing / retreating cylinder 39 rotates 45 °, and the pin 42 has the arcuate groove 43.
After it hits the end of the wheel and cannot rotate,
When 48 is rotated in the tightening direction, the female screw ring 35 rotates with respect to the male screw 40 that does not rotate, and by this action the advancing / retreating cylinder 39 is retracted, and the engaging claws 53 strongly push the engaging claws 53 toward the main body 34. Pull to firmly couple the couplings 55 and 56, and attach the chuck 51 to the main unit 34.
Fixed to.

In this state, the set confirmation bar 70 has a groove 76 as shown in FIG.
It is in the set state by being extruded from and its outer end is aligned with the outer end of the screw cylinder 73.

After confirming the set state in this way, drawbar 60
When the claw is moved back and forth, the chuck claw operating shaft 65 moves back and forth to open and close the chuck claw 64.

To remove the chuck 51 from the chuck fixed state,
The small bevel gear 48 is rotated in the opening direction, and the female screw ring 35 is rotated in the opposite direction to that at the time of setting.

At this time, the advancing / retreating cylinder 39 does not rotate due to resistance due to the engagement of the grasping claw 33 and the engaging claw 53, and only the female screw ring 35 rotates in the loosening direction. The grasping claw 33 separates from the engaging claw 53.

The advancing / retreating cylinder 39 moves forward, and the ring 41 at the rear end moves to the female screw ring 35.
When it comes into contact with the rear side of the
When the pin 42 comes to the position shown in FIG. 2 when it starts to rotate with it and rotates 45 °, the grasping claws 33 and the engaging claws 63 are located between the engaging claws 53 and 66, and the adapter 50 can be removed.

FIG. 5 and FIG. 6 show the second embodiment, in which instead of the annular couplings 55, 56 of the first embodiment, an outer peripheral surface 80 for positioning and an inner peripheral surface 81 for positioning are provided. Is.

That is, an annular fitting portion 82 is concentrically provided integrally with the front surface of the ring 38 fixed to the front portion of the main body 34, and the outer circumference thereof serves as the positioning outer circumferential surface 80.

Further, a concentric recessed fitting portion 83 is provided on the rear surface of the adapter 50 at the rear end of the chuck 51, and the inner periphery thereof is the outer peripheral surface 80.
The inner peripheral surface 81 for positioning is tightly fitted to.

In addition, a round rod-shaped drive pin 84 is attached to a part of the ring 38.
Is fixed, and a round recessed hole 85 into which the drive pin 84 is fitted is provided on the rear surface of the adapter 50.

Other parts are the same as in the first embodiment. Further, although the positioning outer peripheral surface 80 and the inner peripheral surface 81 in the embodiment of FIG. 5 are tapered, they may be straight.

In the case of the second embodiment, the adapter 50 in the non-set state
The engaging claws 53 are inserted from between the grasping claws 33 of the advancing / retreating cylinder 39, and the drive pins 84 are fitted into the concave holes 85 of the adapter 50.

At the same time, the engaging claws at the rear end of the chuck claw operating shaft 65
66 is also inserted from between the engaging claws 63 of the joint member 61.

Next, when the small bevel gear 48 is turned in the tightening direction by the handle engaged with the polygonal hole at the outer end of the bevel gear 48, the bevel gear (not shown) rotates together with the female screw fitting 35, and the first embodiment described above. By the same action as described above, the advancing / retreating cylinder 39 rotates 45 °, the grasping claw 33 of the advancing / retreating cylinder 39 rotates around the back of the engaging claw 53 of the adapter 50, and the operating shaft 65
The engaging claw 63 of the joint member 61 rotates around the back of the engaging claw 66.

After the advancing / retreating cylinder 39 rotates 45 ° as described above and cannot rotate any further, when the small bevel gear 48 is further rotated in the tightening direction, the advancing / retreating cylinder 39 retreats, and each engaging claw 53 causes each engaging claw 53 to be in the main body. The chuck 51 is fixed to the main body 34 by pulling strongly toward 34.

To remove the chuck 51 from the chuck fixed state,
As in the first embodiment, the small bevel gear 48 is rotated in the opening direction,
Turn the female screw ring 35 in the opposite direction to the setting.

At this time, the advancing / retreating cylinder 39 does not rotate due to the resistance due to the engagement of the grasping claw 33 and the engaging claw 53, and only the female screw ring 35 rotates in the loosening direction. The claw 33 separates from the engaging claw 53.

When the advancing / retreating cylinder 39 moves forward and the ring at the rear end contacts the rear side of the female screw ring 35, the freed advancing / retreating cylinder 39 starts to rotate together with the female screw ring 35, and rotates 45 ° to return to the initial position. The grasping claws 33 and the engaging claws 63 are between the engaging claws 53 and 66, and the adapter 50 can be removed.

In any of the above embodiments, the adapter 50 is omitted, and the rear end of the chuck 51 has the same structure as the adapter 50, that is, the rear end of the chuck 51 has the engaging claw 53 and the coupling.
55 or a recessed fitting portion 83, a recessed hole 85 and the like may be provided.

[Effect of device]

In this invention, as described above, the advancing / retreating cylinder provided in the main body of the chuck mounting means is rotatable, and the restricting means for limiting the advancing / retreating range and the rotating range of the advancing / retreating cylinder to the set position and the non-set position of the adapter are provided. At the beginning of the chuck setting operation, the advance / retreat cylinder does not advance / retract, but only rotates to the set position.At the tip of the drawbar that penetrates the main shaft, there is a joint member that rotates with the advance / retreat cylinder and advances / retreats with the drawbar. Since it is provided, the adapter can be attached / detached to / from the advancing / retracting cylinder in the non-set state, and at the same time, the joint member of the chuck claw operating shaft and the drawbar can be attached / detached, which is extremely convenient. Further, when the female screw ring in the main body of the chuck attaching means is rotated in the tightening direction, that is, the setting direction, the advancing / retreating cylinder starts to rotate from the non-setting position at first,
The rotation of the advancing / retreating cylinder and the joint member is stopped when the grasping claws of the advancing / retreating cylinder and the engaging claws of the joint member turn behind the engaging claws of the adapter and the engaging claws of the chuck claw operating shaft, respectively. When the female screw ring continues to rotate in the tightening direction, the advancing / retreating cylinder retracts due to the rotation of the female screw with respect to the male screw, and the grasping claw tightens the engaging claw of the adapter. Can be set at the same time.

Further, in the present invention, since it is not necessary to rotate the chuck with respect to the main body when the chuck is attached or detached, it is easy to handle, especially in the case of a large and heavy chuck.

In the case of the invention of claim (3), the centering of the main body and the adapter can be performed accurately by the engagement of the concave and convex portions of the coupling of the main body and the coupling of the adapter or the chuck, and at the same time, the coupling at the time of driving is also reliable.

In the case of the invention of claim (4), accurate centering can be performed by fitting the positioning outer peripheral surface and the positioning inner peripheral surface of the main body and the adapter or the chuck, and the engagement between the drive pin on the main body side and the concave hole of the adapter or the chuck. The drive force on the main body side can be reliably transmitted to the chuck by the combination, and there is no fear that the main body and the adapter or the chuck will be dislocated in the circumferential direction even when the chuck is normally or reversely rotated by screw cutting.

Further, a set confirmation rod is inserted into a radial hole provided in a part of the main body of the chuck attaching means so as to be able to advance and retreat, and a spring is used to fix the inner end of the set confirmation rod to the rear end of the advancing and retracting cylinder. When the advancing / retreating cylinder turns to the set position by crimping it on the outer circumference, the set confirmation bar is pushed out against the spring on the outer circumference of the ring at the rear end to display the completion of setting,
When the advancing / retreating cylinder turns to the non-set position, the inner end of the set confirmation rod enters into the groove on the outer circumference of the ring by the spring, and the outer end of the rod is pulled from the outer circumference of the main body to indicate that it is in the non-set state. The state of the inside of the main body of the chuck attachment means can be confirmed at a glance by the position of the outer end of the set confirmation rod.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the device of the present invention, FIG. 2 is a front view of FIG. 1 taken along the line II-II, and FIG.
The figure is a vertical sectional front view showing a part of the above-mentioned action, and FIGS.
Is a partially longitudinal front view showing the action of the set confirmation rod, FIG. 5 is a partially longitudinal side view showing the second embodiment, FIG. 6 is a partially cutaway rear view of the same adapter, and FIG. FIG. 3 is a vertical sectional side view showing an example of the chuck exchanging device. 30 …… Spindle, 31 …… Flange, 32 …… Chuck mounting means, 33 …… Grip claw, 34 …… Main body, 35 …… Female screw ring, 36…
… Female screw, 39 …… Advancing / retracting cylinder, 40 …… Male screw, 41 …… Ring, 42 …… Pin, 43 …… Arc groove, 48 …… Small bevel gear, 49
...... Bevel gear, 50 ...... Chuck mounting adapter, 51 ...... Power chuck, 53, 63, 66 ...... Engaging claw, 60 ...... Drawbar, 61 ...... Joint member, 65 ...... Chuck claw operating shaft,
67 …… key, 68 …… key groove, 70 …… set confirmation bar, 71…
… Hole, 75 …… Spring, 76 …… Groove, 80 …… Positioning outer surface, 81 …… Positioning inner surface, 84 …… Drive pin, 85
...... Concave hole.

Claims (5)

(57) [Scope of utility model registration request] 1. A female screw ring 35 which is rotatably mounted in a main body 34 of a chuck mounting means 32 fixed to a front portion of a main shaft 30 provided on a head stock of a lathe and is manually rotated. The male screw 40 to be screwed into the female screw ring 35 is provided at the rear end, and the forward / backward movement cylinder 39 having the same center as the main shaft 30 having the plurality of grasping claws 33 for grasping the chuck mounting adapter 50 at the front end, By rotating the female screw ring 35, the advancing / retreating cylinder 39 is advanced and retracted in the axial direction via the male screw 40, and the chuck mounting adapter 50 is attached to the main body 34 via the grasping claw 33 by the advancing and retracting. In the chuck exchanging device for removal, means 42, 43 are provided for enabling the advancing / retreating cylinder 39 to rotate about its axis and limiting the rotation range to the set position and the non-set position of the adapter 50. Tip of draw bar 60 that penetrates the inside of main shaft 30 Is provided with a joint member 61 that rotates together with the advancing / retreating cylinder 39 and advances / retreats with the drawbar 60.The chuck claw operating shaft 65 protruding from the rear portion of the adapter 50 has an engaging claw 53 of the adapter 50 for advancing / retracting the advancing / retreating cylinder 39. When it is fitted between the grasping claws 33 at the forward position of the range and is at the back of the grasping claw 33, it is fitted between the engaging claws 63 of the joint member 61 at the forward position and the engaging claws 63 The engaging claw 66 located on the back is provided, and the engaging claw 53 of the adapter 50 can be fitted between the grasping claws 33 and positioned on the back of the grasping claws 33 at the non-set position of the advancing / retreating cylinder 39. Further, the engaging claw 66 of the chuck claw operating shaft 65 can be fitted between the engaging claws 63 of the joint member 61 and can be positioned on the back part of the engaging claw 63, and the advancing / retreating cylinder 39 is in the non-setting position. From the set position to the set position, the claws 33, 53, 63 and 66 are engaged with each other to move integrally. A chuck exchanging device that can be retracted. 2. A female screw ring 35 which is rotatably mounted in a main body 34 of a chuck mounting means 32 fixed to a front portion of a main shaft 30 provided on a head stock of a lathe and is manually rotated. It has a male screw 40 to be screwed to the female screw ring 35 at the rear end, and a forward / backward moving cylinder 35 concentric with the main shaft 30 having a plurality of grasping claws 33 for grasping the chuck 51 at the front end. By the rotation of 35, the advancing / retreating cylinder is passed through the male screw 40.
In a chuck exchanging device for advancing and retracting 39 in the axial direction, and attaching and detaching the chuck 51 to and from the main body 34 via the grasping claw 33 by the advancing and retracting, the advancing and retracting cylinder 39 can be rotated about its axial center. In addition, means 42 and 43 for limiting the rotation range to the set position and the non-set position of the chuck 51 are provided, and the tip end of the draw bar 60 penetrating the inside of the main shaft 30 is rotated together with the advancing / retreating cylinder 39 to draw the draw bar 60. A joint member 61 that moves forward and backward together is provided, and on the chuck claw operating shaft 65 that protrudes from the rear portion of the chuck 51, the engaging claw 53 of the chuck 51 of the grasping claw 33 that is at the forward position of the forward and backward movement range of the forward and backward movement cylinder 39. When fitted in the back of the grasping claw 33, provided between the engaging claw 63 of the joint member 61 in the forward position, the engaging claw 66 located on the back of the engaging claw 63, The non-set position of the advance / retreat cylinder 35 In this case, the engaging claw 53 of the chuck 51 is fitted between the grasping claws 33 and can be positioned on the back of the grasping claws 33, and the engaging claw 66 of the chuck claw operating shaft 65 is of the joint member 61. It can be fitted between the engaging claws 63 and positioned on the back of the engaging claws 63, and when the advancing / retreating cylinder 35 rotates from the non-setting position to the setting position, the respective claws 33, 53, 63, 66. Is a chuck exchanging device, wherein the chuck exchanging device can move forward and backward integrally. 3. An annular coupling 56 having radial engaging irregularities is concentrically fixed to the front surface of the main body 34, and the coupling 56 is provided on the rear surface of the adapter 50 or the chuck 51.
The chuck replacement device according to claim 1 or 2, wherein an annular coupling 55 having radial engaging irregularities for engaging with the engaging irregularities is fixed concentrically. 4. An annular fitting portion 82 having a positioning outer peripheral surface 80 concentric with the main body 34 is provided on the front surface of the main body 34, and the positioning outer peripheral surface 80 is also provided on the rear surface of the adapter 50 or the chuck 51. A fitting portion 83 having a positioning inner peripheral surface for tightly fitting is provided concentrically, and a part of the front surface of the main body 34 is engaged with a concave hole 85 on the rear surface of the adapter 50 or the chuck 51.
The chuck exchange device according to claim (1) or (2), wherein a drive pin 84 for integrally connecting the 34 and the adapter 50 or the chuck 51 in the rotational direction is fixed. 5. A set confirmation rod 70 is inserted into a radial hole provided in a part of the main body 34 so as to be able to move back and forth.
A spring 75 for crimping the inner end of 70 to the outer periphery of the ring 41 fixed to the rear end of the advancing / retreating cylinder 39 is provided, and when the advancing / retreating cylinder 39 is in the non-set position on the outer periphery of the ring 41, The chuck exchange device according to any one of claims (1) to (4), wherein the inner end is fitted and a groove 76 is provided for retracting the outer end of the set confirmation rod 70 from the outer periphery of the main body 34.