JPH02109613A - Chuck changing device - Google Patents

Abstract

PURPOSE:To enable the rapid and powerful clamping of an adapter by means of manual operation by providing projecting portions on the front face of an internal thread ring and on the inner face of a body opposite thereto respectively and, when the internal thread ring starts to be rotated, making the projecting portions ride over on each other to rapidly retract the internal thread ring and a holding craw for an adapter together with an advancing/ retracting cylinder. CONSTITUTION:An internal thread ring 5 which is rotated together with a manually rotated driving ring 16 to be moved in the axial direction, and an advancing/retracting cylinder 6 having an external thread 15 which is screwed into the ring 5 on the rear end and a holding craw 3 for a chuck installing adapter 21 on the front end are provided in a chuck body 4. Projecting portions 25, 27 which ride over on each other when the internal thread ring 5 is rotated in the clamping direction to retract both internal thread ring 5 and advancing/ retracting cylinder 6 are provided on the front face of the internal thread ring 5 and on the inner face of the front cover 10 of the chuck body 4 opposite thereto, respectively. Thereby, at the time of clamping, as the internal thread ring 5 starts to be rotated, the holding craw 3 is rapidly moved in the clamping direction by the action of the projecting portions 25, 27, while further enabling strong clamping merely by slightly rotating the internal thread ring 3 to carry out highly efficient clamping by means of manual operation.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a chuck exchange system in which a manually operated chuck attachment means is provided on the main shaft of a lathe, and various types of separate chucks can be freely exchanged and installed. It is related to the device.

[Prior Art] In a chuck for a lathe, a claw driven by power such as hydraulic pressure is provided at the tip of the main shaft provided on the headstock, and various types of separate chucks are detachably fixed to the chuck mounting means by this claw. MHik the work of Jlli
An automatic chuck changing device designed to do this is well known.

There is also a chuck changing device that uses manual tightening as shown in FIG.

In this figure, 1 is a flange fixed to the front end of the main shaft of the lathe (not shown), 2 is a chuck attachment means provided at the tip of this flange 1, and a chuck main body 4 and a grasping pawl 3 are attached.
And the female screw f! that drives this grasping claw 3! It has it5.

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

Further, a female thread 14 on the inner periphery of the female threaded ring 5 is screwed into a male thread 15 on the outer periphery of the reciprocating cylinder 6 whose rear portion is fitted into the recess 7 .

The reciprocating cylinder 6 cannot be rotated relative to the main body 4 by means of a rotation prevention means (not shown), but can only move forward and backward.

An annular wall 8 is integrally protruded from the front part of the main body 4, and the outer periphery of the annular wall 8 and the inner periphery of the recess 7 coincide with each other, and the inner periphery of the reciprocating cylinder 6 is in contact with the outer periphery of the annular wall 8. The outer periphery of the reciprocating cylinder 6 is in contact with the inner periphery of a front cover 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 tip of the reciprocating tube 6 at regular intervals.

Reference numeral 11 denotes a recessed hole formed so as to reach the recess 7 from a part of the outer periphery of the main body 4, and a small bevel gear 12 of a hand crank is inserted into this recessed hole 11.
is rotatably fitted, and this bevel gear 12 is meshed with the bevel gear 13 on the rear side of the female threaded ring 5.

Reference numeral 21 denotes a chuck mounting adapter, on the front surface of which various types of chucks 22 are fixed by means of bolts or the like. Therefore, although there are many types of chucks 22, there is only one type of adapter 21 with the same dimensions. At the rear of this adapter 21, there is provided a recess 23 in which the inner ends of the grasping claws 3 are removably held, and on the inner surface of the rear part of this recess 23, a plurality of claws 17 which are held in the respective grasping claws 3 are provided. are formed at regular intervals.

In addition, a coupling 24 is provided in the recess 23 of the adapter 21.
is fixed to the front surface of the main body 4, and radial projections and depressions are provided that engage with the radial projections and depressions on the front surface of the coupling 18 fixed to the front surface of the main body 4, and the chuck 22 is positioned by engagement of both projections and depressions.

Reference numeral 30 denotes a joint member (not shown) fixed to the tip of the drawer in the center hole of the main shaft of the lathe.

The joint member 30 has a cylindrical shape, and has a recessed hole 29 at its tip, and an engagement piece 31 formed on the inner periphery of this recessed hole 29. In the case of a power chuck, 40 is a chuck claw operating shaft that protrudes rearward from the rear center of this chuck 22. This shaft 40 and each chuck claw are interlocked by a link mechanism provided inside the chuck 22, so that the operating shaft 40 moves forward and backward. Each chuck claw moves inward and outward with movement.

Further, a groove-shaped engagement portion 41 extending over the entire circumference is provided at the rear end of the operating shaft 40, and the engagement piece 31 engages with and disengages from this engagement portion 41.

In the case of the above conventional example, as shown in the 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 claw 17 of the adapter 21 and the grasping claw 3 are engaged. When this is rotated in the tightening direction, the bevel gear 13 meshing with the bevel gear 12 rotates together with the female screw ring 5, and the rotation of the female screw 14 causes the reciprocating cylinder 6 to retreat, and the grasping claw integrated therewith. 3 is claw 17
onto the front M10 of the main body 4 and attach the adapter 21 to the front cover 1.
Fixed to 0.

[Problem to be solved by the invention]

In the case of the above-mentioned known automatic chuck changing device, there is a forward and backward axis for driving the jaws of the chuck mounting means in the main spindle of the lathe, and when a power chuck is attached to the chuck mounting means, there are two forward and backward shafts for driving the chuck. There are problems in that the mechanism is extremely complicated because the drive cylinders must be installed at the rear of the main shaft.

In addition, in the case of the conventional example shown in FIG. 8, in order to tighten the claw 17 with sufficient force with the grasping claw 3, it is necessary to reduce the lead angle of the screw. There is a problem in that the number of rotations of the gear 12 increases and it takes time and effort.

An object of the present invention is to provide a chuck changing device that solves the problems of the conventional chuck changing device as described above and allows quick and strong tightening and rapid removal by manual operation.

[i! ! Means to solve the problem]

In order to achieve the above object, the present invention provides a drive ring which is rotatably mounted inside the chuck body and can be rotated manually as a chuck attachment means, and a drive ring provided inside the drive ring, It has a female screw ring that rotates together with the drive ring and can move in the axial direction, a male screw that screws into the female screw ring at the rear end, and a plurality of grasping claws for gripping the chuck mounting adapter at the front end. The front surface of the female threaded ring and the front inner surface of the chunk body opposite thereto are arranged on the front surface of the female threaded ring and on the inner surface of the front part of the chunk body that opposes the female threaded ring. Each of these is provided with a convex portion that allows the

(Function) Since this invention has the above configuration, when the drive ring is manually rotated in the loosening direction when the main shaft is stopped, the female threaded ring is rotated together with the drive ring in the loosening direction, and the # screw As the convex portion at the front of the ring enters the concave portion between the convex portions of the chuck body, the retracted portion a moves forward due to the rotation of the female screw relative to the male screw of the retractable cylinder, and the grasping claw loosens.

With each grasping claw loosened as shown above, attach the winter melon of the adapter with the desired chuck to each grasping claw, then turn the drive wheel in the direction of tightening, and it will rotate along with it. Each convex part of the female screw ring rides on each convex part of the chuck body and retreats together with the female screw ring, and by further turning the drive ring, the female screw rotates with respect to the male screw, causing the reciprocating cylinder to retreat and the grasping claw to move to the adapter. Tighten the claws.

〔Example〕

In the embodiments shown in FIGS. 1 to 3, parts having the same configurations and functions as those of the conventional example shown in FIG. 8 are given the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, a separate drive ring 16 is fitted on the outside of the female threaded ring 5, and a bevel gear 13 is formed at the rear of this drive ring 16.

The outer periphery of the female threaded ring 5 and the inner periphery of the drive ring 16 are provided with engagement means 20 such as axially uneven strips that are slidably engaged with each other, so that the female threaded ring 5 is attached to the drive ring 16. Allows movement only in the axial direction.

As shown in FIG. 3, the front part of the female screw ring 5 is provided with a plurality of wide trapezoidal convex parts 25 and four parts 26 alternately, and the rear part of the front cover 10 opposite thereto is also provided with a wide trapezoidal convex part 25 and four parts 26, as shown in FIG. Convex portion 27 and concave portion 2
8 will be provided.

Further, a plurality of narrow trapezoidal projections 33 are provided at regular intervals on the rear side of the female screw ring 5, and a narrow trapezoidal projection 33 of 1↑1 is also provided on the front rear surface of the recess 7 of the main body 4 opposite thereto. A protrusion 34 is provided.

Note that a pin 9 provided inside the reciprocating tube 6 is engaged with an axial groove 19 on the outside of the annular wall 8 to prevent rotation, and a plurality of holes 35 at the bottom of the recess 7 are provided to prevent the reciprocating tube 6 from moving forward. Spring 36 to push
will be established.

In the first embodiment described above, as shown in FIG.
When the convex part 27 of 0 is fitted into the four parts 26 of the female threaded ring 5, the protrusion 34 in the recess 7 rides on the protrusion 33 of the female threaded ring 5, and the female threaded ring 5 is brought closer to the part. .

In this state, l7j on the rear side of the grasping claw 3 and on the front side of the front cover 10.
l is wider than the thickness of the claw 17 in the front-rear direction.

In this state, insert the winter melon 17 of the adapter 21 between the gripping claws 3, rotate the adapter 21, and move the winter melon 17 between the gripping claws 3 and 3.
and front 110.

Next, when the small bevel gear 12 is turned in the tightening direction using the handle, the drive ring 16 rotates together with the bevel gear 13, and the female threaded ring 5 is rotated via the engagement means 20.

When the female screw ring 5 starts to rotate as described above, the rear protrusion 3
3 is removed from the protrusion 34, the front protrusion 25 is removed from the protrusion 2.
7 and retreats, the female threaded ring 5 retreats together with the reciprocating tube 6, and the grasping claw 3 moves the claw 17 back together with the adapter 21 at a quadratic speed, engaging the concave and convex portions of the coupling 18 and 24.

This is a female screw! After '25 is retracted, the small bevel gear 12 is further rotated in the direction of tightening, and the 14t screw ring 5 is rotated at the retracted position where the convex portion 25.27 is in contact with the female screw 14.
As a result, the reciprocating cylinder 6 is strongly moved backward, and the winter melon 17 is strongly pressed against the surface 01 of the front cover 10 by each grasping claw 3 to be fixed.

To remove the adapter 21 from the adapter fixed state described above, the small bevel gear 12 is turned in the opening direction.

As a result, the protrusion 25 moves to the side of the protrusion 27, and the protrusion 3
3 rides on the protrusion 34 and the restoring force of the spring 36 causes the reciprocating cylinder 6 to move forward quickly.Furthermore, the rotation of the female screw ring 5 advances the reciprocating cylinder 6, and the grasping pawl 3 engages the pawl 17 of the adapter 21. Release the pressure.

Figures 4 to 7 show the second embodiment;
Components having the same configuration and functions as those in the embodiment described above are given the same reference numerals and explanations will be omitted.

In this embodiment, the coupling 18 has a large diameter, and the forward/backward cylinder 6
The chuck body is the front part 38 of the main body and the rear part 3 of the main body.
It is formed by dividing it into 9 parts, and they are joined together with bolts.

Further, the reciprocating cylinder 6 is fitted between the outer periphery of a concentric cylindrical wall 42 projecting forward from the central portion of the rear body 39 and the inner periphery of the front body 38.

A guide ring 45 is fitted around the outer periphery of the coupling 18 and fixed to the front part of the main body, and the coupling 24 fixed to the adapter 21 is fitted inside the guide ring 45.

Of course, the adapter 21 also has the compulsion ring 24 located outside the portion where the claw 17 is formed.

In this embodiment, a convex portion 27 for the convex portion 25 of the female screw ring 5
is provided on the front part 38 of the main body, and the protrusion 34 corresponding to the protrusion 33 is provided on the rear part 39 of the main body.

In the case of this embodiment as well, under the condition that the claw 17 of the adapter 21 is engaged with the grasping claw 3 as shown by the chain line in FIG. 5, the female screw ring 5 is turned as shown by the arrow in FIG. rides on the protrusion 27, the projection 33 is removed from the projection 34, the female screw ring 5 is moved backward, and when the female screw ring 5 is further turned, the grasping pawl 3 strongly tightens the pawl 17.

Furthermore, when the female screw ring 5 is turned in the opposite direction, the protrusion 33 rides on the protrusion 34 as shown in FIG.
8, the female screw ring 5 moves forward and the grasping pawl 3 is attached to the pawl 17.
away from.

Note that a pin 43 is provided on the front surface of the front part 38 of the main body, and an arcuate groove 44 is provided in the adapter 21, so that when the adapter 21 is attached, the pin 43 fits into the arcuate groove 44 and the adapter 21 is attached to the pin 43.
When the gripping claw 3 and claw 17 are turned until they touch both ends of the elongated hole 44,
are in the engaged position and the separated position.

〔Effect of the invention〕

As described above, the present invention includes a drive ring that is rotatably mounted inside the chuck body and rotated manually, and a drive ring that is located inside the drive ring, rotates together with the drive ring, and rotates in the axial direction. The chuck is attached to the chuck by means of a chunk mounting means consisting of a reciprocating cylinder having a movable female screw ring, a male screw screwed into the female screw ring at the rear end, and a plurality of gripping claws at the front end for gripping the chuck mounting adapter. Because the mounting adapter is attached, the mechanism is significantly simpler than the 7-stage automatic chuck mounting system, and there is no need to specify the chuck stop position, so detection control means for specifying the chuck stop position is required. In the case of a power chunk, only one drawbar needs to be passed through the main shaft and only one cylinder at the rear end of the main shaft is required, making the structure extremely simple.

Furthermore, on the front surface of the female threaded ring and the front inner surface of the chuck body opposite thereto, there are protrusions that ride on each other when the female threaded ring begins to rotate in the tightening direction, causing the female threaded ring to retreat together with the advancing/retracting cylinder. At the beginning of tightening, when the female screw ring is started to be rotated, the grasping claws will quickly move in the tightening direction due to the action of the convex portion, and from then on, by only slightly rotating the female screw ring, Since it can perform strong tightening, extremely efficient tightening can be performed.

Furthermore, when removing the adapter fixed to the chuck body, by turning the female screw ring in the opposite direction, the grasping claws are quickly loosened by the reverse action described above, so that the adapter can be replaced very efficiently.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing a first embodiment of the device of the present invention, FIG. 2 is a partially omitted front view of FIG. 1 taken along the line T,
FIG. 3 is a developed cross-sectional view showing a female threaded ring and a portion of its front and rear parts, FIG. 4 is a vertical side view showing the second embodiment, and FIG. 5 is a front view with some of the same parts omitted. FIGS. 6 and 7 are developed sectional views showing respective states of a female threaded ring and a portion of its front and rear parts, and FIG. 8 is a longitudinal sectional side view showing an example of a conventional chuck exchange device. 1...Flange fixed to the main shaft, 2...
・Chuck mounting means, 3... Grasp claw, 4...
...Chuck body, 5...Female screw ring,
6... Advancement and retreat cylinder, 10...
Front cover, 12... Small bevel gear, 13...
...Bevel gear, 14...Female screw, 1
5...Male thread, 16...Drive ring,
17...Jaw, 21...Chuck mounting adapter, 22...Chuck,
25.27...Protrusion, 26.28...
Recess, 33.34... Protrusion, 36...
...Spring, 38...Front part of main body, 3S
・・・・・・Rear part of the main body. Patent applicant Morito Kitamura of Teikoku Chunk Co., Ltd.

Claims (1)

[Claims] (1) In a device in which a chuck attachment means is provided on the front part of the spindle provided on the headstock of a lathe, and a separate chuck can be detachably fixed to the spindle by this attachment means, the chuck attachment means is , a drive ring rotatably mounted inside the chuck body and rotated by manual operation, and a female screw ring located inside the drive ring that rotates together with the drive ring and can move in the axial direction. and a reciprocating tube having a male thread at the rear end that screws into the female thread ring, and a plurality of grasping claws at the front end for grasping the chuck mounting adapter, and facing the front surface of the male thread ring. The chuck exchanger is provided with protrusions on the inner surface of the front part of the chuck main body, respectively, so that when the female threaded rings start rotating in the tightening direction, they ride on each other and move the female threaded rings backward together with the advancing/retracting cylinder.