JPS5973209A - Automatic changer for chuck jaw - Google Patents

Abstract

PURPOSE:To make the promotion of robotization for machining attainable, by making a chuck jaw changeable in a mechanical manner with such a jaw that corresponds to a desired chucking diameter one stored in a jaw storage magazine's holder. CONSTITUTION:Each of sliding grooves 10 and 11 of a chuck 5 and a holder 53 of a jaw storage magazine 50 are all indexed into jaw changing positions respectively. A jaw engaging device 18 is operated by a jaw disconnecting device 81 whereby engagement between a jaw 13 and a slider member 12 is taken off, and under this condition, jaws inside these sliding grooves are shifted to the inside of the holder. After that, the optional jaw of the magazine 50 is indexed into the jaw changing position. Thus, the jaw 3 of the chuck 5 can be mechanically changed with such a jaw that corresponds to a desired chucking diameter one stored in the magazine 50.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic chuck jaw changing device that automatically replaces the jaws of a chuck that grips a workpiece with jaws that correspond to the grasping diameter of the workpiece.

With conventional chucks, when it becomes necessary to replace the jaws in response to changes in the shape and dimensions of the workpiece, the industry name is to replace the jaws or the chuck body. The reality is that it takes a lot of effort and time to replace nails, reducing productivity. Therefore, in order to automatically replace this claw, the middle part of the replacement arm is pivoted between the chuck and the 71\storage magazine, with a rotation capacity of 11J, as in a general two-tool replacement device. It has been proposed that clippers provided at both ends of the exchange arm 11 grip the jaws of the chuck and the jaws of the jaw storage magazine for exchange, but in such an exchange device, the exchange arm and the gripper part The structure of the device becomes complicated, resulting in a one-height height, and a large space is required between the chuck and the jaw storage magazine for changing the jaws, resulting in an increase in the size of the device.

SUMMARY OF THE INVENTION Therefore, the present invention aims to solve the problem described in item 1, and provides a chuck jaw that can simplify a device for exchanging the jaws of a chuck and the jaws of a jaw storage magazine, and can also downsize the device. The aim is to provide an automatic exchange device.

Next, embodiments of the present application will be described based on the drawings. The figure shows a well-known machine tool such as an NC lathe, 2 is its machine base, 3 is a main spindle, and an automatic chuck jaw changing device 4 is implemented in this machine tool. Next, this automatic chuck jaw changing device 4 will be explained.

5 is a quick change chuck, and its chuck body 6
is integrally mounted on the front end of the main shaft 3. As shown in FIG. 3, a stem piece 7 is fitted into the center of the chuck body 6 so as to be slidable in the direction of the rotational axis of the chuck body 6. This mock piece 7 is connected by a pole 1-9 to a 1-rover (not shown) which is connected to piston rotors 1 to 1 of a rotary cylinder 8 attached to the rear end of the main shaft 3. Furthermore, in the radial sliding grooves 10.11 (three shown in the drawing, but the number is not limited) formed in the chuck body 6, there are slider members 12 and pawls 13. The sliding portions 13a are respectively fitted so as to be slidable in the radial direction, and the wedge portion 12a having a C-shaped cross section formed at the center of the slider member 12 has a wedge portion 12a having a 1′-shaped cross section formed on the wedge piece 7. is fitted into the wedge groove 7a. Furthermore, a positioning hole 12b for positioning is formed on the outer periphery of the slide member 12, as shown in FIG. Above claw 1
3 is formed with a locking portion 14 for replacing the claw. This locking part 14 is provided with a protruding hole 116 that does not extend toward the rear side of the pawl 13 at the tip of a vertical part 15 that stands up in the sliding direction from the outer end surface of the pawl 13 in the sliding direction. It is composed of Note that the locking portion 14 may be configured by providing a projecting piece 16 so as to project forward. In addition, rack teeth 17 are provided on the rear surface of the pawl 13.
is formed, and these rack teeth 17 form the pawl engaging device 1 shown below.
8, it is possible to engage and disengage the slide portions +, 4 and 2. This claw engaging device 18
2, and an operating pin 20 is fitted into the sliding member 12 so as to be movable only in the radial direction.

Rack teeth 21 are formed on the front surface of this meshing member 19.
The rack teeth 21 are engaged with the rack teeth 17 of the pawl 13 by the spring force of the biasing spring 22. Further, the engaging member 19 and the operating pin 20 are engaged with each other by engaging surfaces inclined with respect to the sliding direction, and when the operating pin 20 is pushed in from the outer circumferential side and moved toward the center of the chuck body 6, the engaging member 19 and the operating pin 20 are engaged with each other. 19 against the spring 22 to move the rack teeth 21 to a position where they do not engage with the rank teeth 17, and return the operating pin 20 to its original position to move the meshing member 19. The rack teeth 21 are slid forward by the force springs 22 to move the rack teeth 21 to a position where they align with the rack teeth 17. ”1 1t
A set pin 23 is fitted into the mating member 19 so as to be movable 1M in the front and back direction, and this ceramic pin 23 is inserted into the spring 2.
4 forces the front hei 1J forward and is prevented from coming out by a pin 25. Normally, the tip of this cella pin 23 is engaged with the rack teeth 17 of the pawl 13. ”
The quick change chuck 5 configured as described in 1.
sliding groove] 1 to a predetermined pawl replacement position A (the figure shows the case above the center of rotation, but
Any position such as horizontal direction or downward direction may be used. ) and can be stopped.

Next, 28 is a guide part in the front-rear direction (horizontal direction in FIG. 2) formed in a part of the machine base 2, and 29 is fitted into this guide part 28 so as to be movable in the front-rear direction/\↑N. With this table, screws 1 to 30 in the longitudinal direction of a longitudinally moving cylinder 30 fixed to the machine base 2 are connected. Further, the stopper poles 1-31 are screwed into the table 29 so as to be adjustable back and forth, and are fixed by lock nanos 1-32, and the tip of the stopper poles 1-13 is attached to a contact portion 33 formed on the machine base 2. The forward end of the table 29 is positioned by coming into contact with the table 29. The head side end of the cylinder body 34a of the lifting cylinder 34 is fixed to the mounting pole 1 by 35 on the table 29, and the screw 1 is directed upward. The cylinder body 34a of this lifting cylinder 34 is a tube member 36
a and a lid member 36b, and in the center of this lid member 36) is a supply pipe 3 protruding into the tube member 36a.
7 is fixed, and this supply/discharge pipe 37 is inserted into the insertion hole 38 of the screw 1-c and the piston rod 34b.

This supply pipe 37 is formed with a supply/discharge hole 40 for supplying and discharging pressure oil through the communication hole 39 to the upper screw 1 hem chamber. A feeding hole 41 for supplying oil to ships is formed."
is punished by +IY1, and this display ll1lII42 is projected through the y1 descending frame, which will be described later. In addition, a sliding hole formed in the shaft portion 43a of the shaft member 43 is fitted to the outer periphery of the tube member 3G so that it can slide with the key 45 being used to prevent rotation. The tip of the piston rotor F 34 b is connected to one end of the shaft portion 43 a J of this shaft member 43 . A support frame 46 is integrally attached to the shaft portion 43al of this shaft member 43, and this support frame 46
and the shaft member 43 constitute an ff lowering frame 47.

This support frame 46 has limits I on three sides of the shaft member 43.
・Switches 48 and 49 are set to -J.

This limit 1 position 48 is designed to detect the 1 position 42a of the display shaft 42 when the lifting frame/17 is raised by the lifting cylinder 34 to the maximum. The first lowering tip 49 detects the ten end surface of the tube member 36a via the detection rod 19.1 when the first lowering frame 47 is lowered to its lowest position. When the switch 49 is moved to this limit 1, the NJ shaft portion 49b is connected to the elevator frame 4.
-1:, 'T; Adjustably screwed together and fixed by lock nano h 49 c, this take-away shaft part 4
The lower end of the tube member 36a contacts the -1 end of the tube member 36a to position the lower end of the elevating frame 47.

Next, 50 is a jaw storage magazine for storing a large number of jaws 13 to be replaced with the jaws 13 of the quick change chuck 5. In this nail storage magazine 50,
51 is a rotating body having a circular planar shape, and a hole 52 formed in the center thereof is rotatably fitted into the shaft portion 43a of the shaft member 13.

The axis of rotation of this rotating body 51 is set to be parallel to the sliding direction of the sliding groove 11 at the jaw exchange position A in the quick change chuck 5.

On the outer periphery of this rotating body 51, there are a number of holders 53 capable of holding the sliding portions 1.3a of 1.13 that can be fitted into the sliding grooves 11 so as to be removable in the sliding direction. They are provided at equal pitch intervals. This holder 5'3 has claw 1'3
A retaining groove 54 in the − and − directions formed on the outer periphery of the rotating body 51 so as to fit the sliding portion 13a of the
It is configured as a holder 55 that locks and holds the claw] 3 fitted therein. This retainer 55 is composed of two locking pins 55a which are embedded in the bottom of the retaining groove 54 so as to be freely protruding and retractable, and which are biased in the protruding direction by a spring 56 and prevented from being removed by a pin 57. , a gripping piece or the like that is moved by a cylinder or the like. The tips of these locking pins 55a are formed into a chevron shape when viewed from the side, similar to the bottom pin 23 of the quick change chuck 5, and are pushed by the rack teeth 17 of the pawls 13 when the pawls 13 are inserted into or removed from the holding grooves 54. It is designed to be included. The sliding portion 13a of a replacement pawl]3 is fitted into the holding groove 54, and is held in place by a locking pin 55a. ”
- A gear 58 is formed on the rotating body 51, and this gear 58
The rotating shaft 59 of the motor 59 is fixed to the support frame 46.
A drive gear 60, which is attached to the drive gear a, is also meshed with the drive gear 60. In addition, dogs 61 and 62 are fixed to the lower side of the rotating body 51 corresponding to the required holders 53.
A deceleration limit switch 63 for detecting the lug 61 and a stop limit switch 64 for detecting the other lug 62 are sequentially attached to the lower end of the shaft member 43.

When the limit switch 63 detects the dog 61, it switches the motor 59 to deceleration rotation, and when the limit switch 64 detects the dog 62, it changes the rotation of the motor 59 to ('i,
+JY, thereby the holding groove 54 of each holder 53 is positioned at the forward end and the lifting frame 47 is
is located at the lowering end (hereinafter referred to as replacement preparation state)
It is designed to index and stop at a predetermined pawl exchange position [B, which is located on the extension line of the sliding groove II of the pawl exchange position A.

Next, 65 is an exchange device for exchanging the pawls 13 from the sliding groove 11 at the pawl exchange position A to the holder 53 at the pawl exchange position 13, or from this holder 53 to the sliding groove 11, respectively. It is composed of a guide block 66 and a claw moving device 67 shown below. ”1 Kite Block 6
6 is fixed to the lower end of the shaft member 43 marked 1. This guide block 66 has these sliding grooves 11 in the part that is located between the sliding groove 11 at the pawl exchange position A and the holder 53 at the pawl exchange position B in the exchange 7 (Q ready state).
Ya hold! M! A guide groove 68 is formed substantially continuous with the guide groove 54 in a straight line. This guy I-groove 68 is the sliding groove 1
1 and the holding groove 54, the sliding part of the pawl 13] 3a is formed in a cross-sectional shape that can guide the pawl 13, and the upper and lower ends of the pawl 13
The tip is formed to be slightly wider so that it can be easily guided into the guide groove 68. In addition, it is preferable that the length of the guide 1 to the groove 68 is at least approximately the same as the length of the sliding portion 13a of the claw 13 so that the sliding portion 13a of the claw 13 can be stably guided over approximately the entire length. . Next, in the pawl moving device [67], 69 is a moving cylinder fixed to the support frame 46, and its screw I-in rod 70 is moved downward on one side of the holder 53 at the pawl exchange position B. It is placed in a prominent position. A movable body 71 is fixed to the tip of this screw 1-rond 70, and a locking piece 74 and an operating piece are inserted into two guide grooves 72 and 73 in the front and rear directions formed in this movable body 71 as shown in FIG. 75 are fitted together so as to be movable in the front and rear directions.

These locking pieces 74 and operating pieces 75 have intermediate parts attached to the movable body 7.
Both ends of the link 76 attached to the holder 1 are connected by pins. Further, the operating piece 75 is biased rearward by a spring 77 that is pressurized between the movable body 75 and the locking piece 74.
The stop portion 74b of the movable body 71 comes into contact with the movable body 71 to prevent it from coming off, and normally the operating portion 75a of the operating piece 75 projects rearward, and the engaging portion 77Ia of the locking piece 74 projects forward.

When the piston door 0 of the moving cylinder 69 is moved to the lowest end as shown in FIG.
When the piston door 0 moves to the uppermost position, the projecting piece 14 of the pawl 13 at the pawl exchange position B and the small end surface It is designed to be located between In addition, the operation section 75 of the operation piece 75
a is moved through passage grooves 78 and 79 formed at the bottom of the J-mark holding groove 54 and the guide groove 68. An operation guide piece 80 is disposed within the passage groove 79 of the guy 1 to block 6G and is held movably in the front and rear direction by the guy 1 to block 66. This operating guy 1 piece 80 is moved back and forth by a claw release cylinder which will be described later. When the piston rod 70 of the claw moving cylinder 69 is lowered, the operation guide piece 80 is moved to the forward end as shown in FIG. Operation piece 75
is moved forward against the spring 77, thereby moving the engaging portion 74a of the locking piece 74 to the claw exchange position [the overhanging piece 1 of the claw 13 of A].
4, and when the piston door 0 is at the lowering end, it is moved to the backward end as shown in FIG. 8, and from this point the operating piece 75 is guided forward. When the locking piece 74 is released, the engaging portion 74a of the locking piece 74 can be inserted from the rear side between the projecting piece 14 of the pawl 13 and the small end face to the pawl exchange position. Note that the operation portion 75a may be formed of a pin, and a guide groove for guiding the pin may be formed in the operation guide piece 80, so that the operation guide piece 80 forcibly moves the operation piece 75 back and forth. In addition, the moving body 7
1 is screwed with a stopper shaft l-00, and this l-bar shaft 100 is connected to the flange portion 6 of the moving cylinder rod 9.
It is inserted through a hole 101 formed in 9a. Nuts 102 and 103 for positioning the descending ends and ascending ends of the screws 1 to 70 are screwed onto the stopper shaft 100.

Next, 81 is a claw removing device for operating the claw engaging device [18 of the quick change chuck 5 to disengage the sliding member 12 and the claw 13.

In this claw removing device 81, 82 is a claw removing cylinder, which has a piston chamber 82a formed in the guide block 66.
Fit the piston 82b so that it can move up and down, and screw this screw 1-
A piston rod 84 is connected to a piston 82b. This declawing cylinder 82 also serves as a positioning cylinder, and its piston rod 84 is directed approximately toward the center of the chuck. A mounting piece 85 is fixed to this screw 1-rod 84, and a hollow cylindrical suppression pin 86 is protruded from this mounting piece 85 as shown in FIG. Reference numeral 86 is positioned so as to face the end surface of the operation pin 20 of the claw 13 in the above-mentioned claw replacement position in the replacement preparation state, and screws 1 to 86 of the claw removal cylinder 82 are connected to each other.
4 is moved to the lower end, the operating pin 20 is moved toward the center of the chuck, and the engaging member 19 is moved to its own rank tooth 2.
1 is moved to a rearward position where it does not engage with the rack teeth 17 of the pawl 13. Further, as shown in FIG. 5, a positioning pin 87 for positioning the claw 13 at the claw replacement position A is protruded from the handle piece 85. This positioning pin 87 is positioned so as to face the positioning hole 12b of the slider member 12 at the pawl exchange position A in the replacement preparation state, and when the piston rod 84 is moved to the lower end, this positioning pin 87 is inserted into the positioning hole 12b. 12b to index and position the slider member 12 at a predetermined position. The positioning pin 87 and the positioning hole 12b together with the claw release cylinder 82 constitute a positioning device. In addition, an indicator rod 88 is fixed to the mounting piece 85 as shown in FIG. By operating it, the -1-1 end of the piston rod 84 is detected and obtained.

A guide tube 91 fixed to the guide block 66 is fitted into the hollow hole 86a of the suppression pin 236, and the suppression pin 8
6 and the positioning pin 87 are prevented from rotating about the piston rod 84. Yet again. The mounting piece 85 has an inclined groove 92 with a ``■''-shaped cross section.
is formed, and an inclined part 93 having a T-shaped cross section formed at the rear end of the operation guide piece 80 is fitted into this inclined part 1ζ92.

Next, 94 is an engagement confirmation device for detecting whether the return movement of the operating pin 20 has been reliably performed when the pushing of the operating pin 20 by the claw removing device 81 is released.
1. It is constituted by a proximity switch 95 provided in the tube hole 91a of the guide tube 91. This proximity switch 95
can detect the operating pin 20 when the operating pin 20 is located at the return position in the replacement preparation state, but when the operating pin 20 is pushed in by the suppression pin 8G, the operating pin 20 cannot be detected. The location is set. Note that 9G is a cover attached to the front end of the support piece 4G, and a proximity switch 97 for detecting the presence of the claw 13 at the small exchange position A is attached to the lower end. Also,
A proximity switch 98 for detecting the presence of the claw 13 at the claw replacement position B is attached to the front end of the shaft member 43.

Next, the operation when replacing the jaws 13 of the quick change chuck 5 with the jaws 13 of the jaw storage magazine 50 in the machine tool 1 having the above configuration will be described. First, when a command to change the jaws is sent from a separate command device due to a change in the workpiece, etc., the rotation of the spindle 3 is stopped by the command, and one of the jaws 13 is moved to a predetermined position A for changing the jaws. Figure out.

Further, the rotating cylinder 8 moves the wedge piece 7 forward to move the three claws 3 of the quick change chuck 5 to the open position. Next, the longitudinal movement cylinder 30 is actuated to move the table 29 to the forward end as shown in FIG.
- After that, the )1 lowering cylinder 34 operates and the H1 helmet frame 47
lower to the lower end. The forward end of the table 29 and the T'-falling end of the counterfeit frame 47 are determined by the S1-Tsuba-Pol 1-31 and the Take E JllIll1 part 49 b NovJe L: Yaw). As a result, one of the halters 53 of the pawl storage magazine 50 is accurately positioned at the pawl exchange position B, and the guy 1 groove 68 of the guy 1 block 66 is aligned with the sliding groove 11 of the pawl 13 at the pawl exchange position Δ. The claw replacement position [r3] is accurately positioned between the holding groove 54 of the holder 53 and substantially continuous with them in a straight line, and is ready for replacement. Note that the rotating body 51 of the claw storage magazine 50 is indexed and rotated in advance by the motor 59, and the empty holder 53 for storing the claws 13 at the claw replacement position Δ is indexed to the claw replacement position B. The indexing of the empty holder 53 in the claw storage magazine 5Q described in -1- may be performed after the longitudinal movement cylinder 30 and the lifting cylinder 34 are operated. Next, the six moving cylinders of the claw moving device @67 are activated to lower the moving body 71. In case 2, the claw removing cylinder 82 of the claw removing device 81 has its screw I-J held at the 2y1 end as shown in FIGS. 2 and 5. An operation guide piece 80 disposed in the passage groove 79 is made to protrude forward. Therefore, when the movable body 71 is lowered as described above, the operating section 75a of the operating huff 5 is moved to the operating guide I-- as shown in FIG.
The locking piece 7 is engaged with the piece 80 and moved forward.
4 is moved rearward, and the engagement part 74a and the protrusion Ji' of the claw 13 at the claw exchange position Δ are prevented from interfering with each other. When the movable body 71 is positioned at the lower end, the engagement part 74a is It is located at the rear between the small end face and the overhanging piece 16 to the claw exchange position.

Next, the claw removing cylinder 82 of the claw removing device [81] is activated to lower the several-piece piece 85, which causes the suppression bin 86 to push the operation bin 20 of the claw engaging device 18 toward the center of the chuck and engage the yX1S material. 19 is moved backward as shown in FIG.
engage and disengage. Furthermore, even if the engagement between the rank tooth 21 and the rack tooth 17 is disengaged as described in item 1, the perforation pin 23 is still engaged with the rack tooth 17 of the pawl 13 by the force of the spring 24. The pawl 13 at the pawl exchange position Δ is prevented from falling out of the sliding groove 11. Also, take the above (= J piece 8
5, the positioning pin 87 is aligned with the positioning hole 12) of the sliding member 12 as shown in FIG.
1 □ Positioned by Seimu, Guy 1~! The slides of f&68 and pawl exchange 1;lmA are precisely opposed. In addition, when the mounting J'r' 85 is fixed as shown in 1) above, move the piece 80 backwards,
As a result, the operating piece 75 of the pawl moving device 67 is moved backward by the spring 77, and the locking piece 74 is moved forward, so that the locking portion 74a is connected to the small end surface of the pawl I3 at the pawl exchange position C and the overhanging piece. It is fitted between 16.

Next, the moving cylinder 69 is operated to raise the movable body 71 by two degrees, so that the engaging portion 74a of the locking piece 74 hooks the overhanging piece 16 of the pawl 13 at the pawl exchange position A, and this pawl Raise 13. Therefore, as shown in FIG.
8 and is fitted into the holding groove 54 at the claw replacement position B.
In a state where it is fitted into this holding groove 54, it is locked and held by a locking pin 55a. Next, the 1-959 operates to index and rotate the rotating body 51 of the °C jaw storage magazine 50, and to move the narrow holder 53 for storing the next jaw 13 of the quick change chuck 5 to the jaw exchange position 3. put out.

Further, the claw release cylinder 81 operates to raise the handle 1 piece 85, whereby the suppressing pin 8G releases the pressing of the operating pin 20, and the positioning pin 87 is removed from the positioning hole 12b. ” 1, the suppression pin 86 is the operating pin 2.
When the push-in of 0 is released, the engaging member 19 of the claw 1 combining device 18 is moved back forward by the urging spring 22, and at the same time, the operating pin 2° is moved back toward the outer circumferential side of the chuck.

In this case, the proximity switch 95 of the engagement confirmation device 94 detects the presence of the operating pin 20, confirms whether the operating pin 2o has been completely returned to its original position, and then performs quick change again based on this confirmation signal. The chuck 5 is indexed and rotated to index the sliding groove 11 of the next pawl 13 to the pawl exchange position Δ.

After that, repeat the above operation and tighten the tight change chuck 5.
The three claws I3 are held in the holder 53 of the claw storage magazine 50.

As described above, insert the third claw 13 into the claw storage magazine 50.
After being held in place, the claw release cylinder 81 operates and is removed.
] When the proximity switch 95 detects the operating pin 20, the quick-change chuck 5 is indexed and rotated again, and the first removed jaw 1. ') sliding groove 11 (when the claw I3 was formed)
) is again indexed to the claw replacement position Δ. Also, the motor 59 rotates the rotating body 51 of the claw storage magazine 5° to the claw exchange position A.
The holder 53 holding the pawl 13 to be fitted into the sliding groove 11 is moved to the pawl exchange position B as shown in FIGS. 11 and 12.
Find out. ” When the holder 53 holding the pawl 13 is indexed to the pawl replacement position B, this boulder 5
The engaging portion 74a of the pawl moving device 67 is automatically positioned between the projecting piece 16 of the pawl 13 held at 3 and the small end surface. Next, the claw release cylinder 82 is activated to lower the 14 piece 85, the suppression pin 86 pushes the operation pin 20 again to move the engagement member 19 backward, and the positioning pin 87 moves the positioning hole 12b. This positions the relative positions of the guys 1 to 66 and the chuck body [3.Next,
The moving cylinder 69 operates to lower the moving body 71,
As a result, the pawl 13 held in the holder 53 at the pawl exchange position B is pushed out from the holder 11ζ54 by the locking piece 74 and guided to the guide 1 through the groove 68, as shown in FIG. The sliding groove 11 is fitted into the sliding groove 11, and the set pin 23 locks and holds the sliding groove 11 in a fitted state. ” 2, when the claw 13 fitted in the holding groove 54 is fitted into the sliding groove 11, the claw 13 is fitted into the sliding groove 11.
Since the position of the pawl 13 is corrected by being guided by the guide groove 68, the pawl 13 can be reliably positioned in the sliding groove 11. , also, the moving body 71 as shown in
When the lever is lowered, the claw release cylinder 82 lowers the mounting piece 85 and moves the operating guide 1-piece 80 backward, so the operating portion 75a of the operating member 75 is pushed forward by the operating guide piece 80. Therefore, the lock rfl+ 74a of the lock 11-piece 74 never comes off from the lock portion 14 of the claw 13. Next, the claw release cylinder 82 operates to raise the mounting piece 85, whereby the suppressing pin 86 releases the operation pin 2o from being pushed in, and the locking pin 87 fills out from the positioning hole 12b. . Therefore, the engaging member 19 of the pawl engaging device 18 is moved back forward by the E' force spring 22, and the rank tooth 21 of the pawl engaging device 18 is moved back to the pawl exchange position A.
is engaged with the rack (Ef I 7) of the claw 13, and the operation pin 2o is moved back to the chuck outer circumferential side.In this case, the rack tooth 21 of the engaging portion +419 is engaged with the rack tooth 1 of the claw 13
7, the operating pin 2o is completely returned and the operating pin 20 can be detected by the proximity switch 95.However, for some reason, the engagement between the rack teeth 21 and the rack teeth 17 is uncertain. If so, use 1: Bin 2.
0 is incomplete, and this operating pin 20
cannot be detected by the proximity switch 95, and it is reported that the engagement of the rack teeth 21.17 is uncertain. When the mounting piece 85 is raised by the claw removing cylinder 82 as shown in 2, the operation guide piece 80 is moved forward to disengage the engaging portion 74a of the locking piece 74 from the locking portion 14 of the claw 13. Next, the moving cylinder 69 is actuated to move the moving body 71 to the outer end. After that, the quick change chuck is rotated five times to index the sliding groove 11 of the second removed pawl 13 to the pawl exchange position Δ, and the motor 59 rotates the rotating body 51 to the pawl exchange position. Claw 13 to be fitted into sliding groove 11 of C
The holder 53 holding the is indexed to the claw replacement position B.

When the holder 53 holding the claw 13 is indexed to the claw replacement position B in this way, the engaging portion 74a of the locking piece 74 is automatically fitted between the projecting piece 16 of the claw 13 and the small end surface. do. Thereafter, the claws 13 of the claw storage machine 50 are fitted into the three sliding grooves 11 of the quick change chuck 5 in the same manner as described above. After the third pawl 13 is fitted into the sliding groove 11 as described in Section 2, and the moving body 71 and mounting piece 85 are raised by 1, the motor 59 rotates the rotary body 51. first nail 1
Move the empty boulder 53 from the position where 3 was removed to the claw replacement position B.
to prepare for the next nail replacement. After that, the lifting cylinder 34 operates to raise the lifting frame 47, and then the longitudinal cylinder 30 operates to move the table 29 rearward.
As a result, the claw storage magazine 50 and the changing device 65 are moved to a non-exchanging position away from the quick change chuck 5, and a series of claw changing operations is completed. In the above operation description, after removing all the claws 13 from the three sliding grooves 11 of the quick change chuck 5, these sliding grooves 1
1 is fitted with a claw 13, but each sliding 'm1
The claw 13 may be fitted into the sliding groove 11 each time the claw 13 is removed from the slide groove 11.

Note that the present application is not limited to the specific configuration of the chuck; for example, rack teeth provided on a slider member may be engaged with rack teeth of a pawl, and this slider member may be provided at the rear end of the main shaft. The pawl engaging device may be configured so that it can be moved backward by a cylinder or the like as a pawl removing device, or the pawl engaging device may be configured so that the pawl can engage and disengage the slider member at multiple locations at the same time. It is obvious that the pawl engaging device may be configured such that the sliding member and the pawl can be engaged and disengaged by rotating the operating pin. In addition, the claw storage machine has a holder provided on an endless moving body, as used in tool magazines, etc., or a holder is provided in the radial direction on two sides of the outer periphery of the rotating body, and the axis of rotation of this rotating body is set at 90 degrees.
It may also be possible to rotate it by degrees. Further, the pawl moving device may be any device that can move the pawl in a straight line. For example, a cylinder or a solenoid is provided on the piston rond of the moving cylinder in the above embodiment, and a locking piece is provided on the piston rond of this cylinder or the plunger of the solenoid. , this locking piece can be attached to and removed from a locking part such as a hole provided in the claw, or a locking piece is provided at the tip of a rank rod that is moved linearly by a motor, and this locking piece is attached to the claw. It is also possible to make it possible to engage and disengage from the locking portion. In particular, if a drive means capable of position braking, such as a servo motor or digital cylinder, is used to move the locking piece, it will be possible to easily adapt to changes in the outer diameter of the chuck, and the claws and slider members can be easily changed. It is preferable that the engagement position of the holder can be changed to an arbitrary position. Furthermore, in the present application, the guy 1-block of the above embodiment is omitted,
The holder at the jaw exchange position in the jaw storage magazine may be directly connected to the sliding groove at the jaw exchange position on the chuck.

As described above, in the present invention, the sliding groove of the chuck and the holder of the pawl storage magazine are indexed to the pawl exchange position, and the pawl engaging device is operated by the pawl releasing device to engage the pawl and the slider member. In this state, use the pawl moving device to move the pawl in the sliding groove into the holder, then index the boulder in the pawl storage magazine to the pawl replacement position, and move the pawl inside this holder. The device allows the chuck jaws to be moved into the sliding groove and then reengage the jaws with the slide member, so that the jaws of the chuck can be adjusted to the desired gripping diameter stored in the jaw storage magazine. The claws can be mechanically replaced, allowing unmanned machining. In addition, the holder of the above-mentioned claw storage magazine is indexed on the extension line of the sliding groove at the claw exchange position.5 To change the claw from the sliding groove to the holder or from the holder to the sliding groove, move the locking part of the claw with the claw moving device. This can be done simply by locking and moving in a straight line, making it easy to replace the claws! This can be done directly from A, thereby reducing manufacturing costs.

Furthermore, since the jaws can be replaced by locking the jaws and moving them in a straight line as described in ``2'', the distance between the chuck and the jaws 11'+ and storage magazine can be reduced, and the equipment can be easily operated. It is also possible to reduce the size.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a cross-sectional view with a part of the claw omitted, FIG. 2 is a cross-sectional view of the one in FIG. 1 in preparation for replacement, and FIG. 3 is a plan view thereof. Figure 4 is the third
5 is an enlarged sectional view taken along the line V-V of FIG. 2, FIG. 6 is a sectional view taken along the line Vl-Vl of FIG.
Fig. 8 is a partial view showing the operating state of the one in Fig. 1, Fig. 9 is a sectional view showing the operating state of Fig. 5, and Fig. 10 is a partial view of the one in Fig.
Fig. 11 is a sectional view taken along the line X I - X I in Fig. 12;
It is a sectional view taken along the line n-o-o-xu. C...Main shaft, 5...Quick change chuck (chuck), 6...Chuck body, l011
1 ・Printing! h11'4", 12... slip-j part (71,
13...claw, 14...locking portion, 18.claw engagement device,
50 Claw storage magazine, 53 Boulder-16'7・
・Claw moving device, 81・Claw removal device! ￥ Fl Applicant
Howa Kogyo Co., Ltd. No. 501 Fig. 9 Fig. 61 missing 1 Fig. 8 Fig. 7 Fig. 10r'/J, 56 No. 11 r<1 No. 121 item 6-

Claims (1)

[Claims] 1. A chuck body attached to the main shaft, a slider member slidably fitted in a radial sliding groove in the chuck body, and a radial sliding groove in the chuck body. The sliding groove of the pawl includes a pawl that is slidably fitted in the sliding groove and has a locking portion for moving the pawl, and a pawl engaging device that can engage and disengage the pawl from the slider member. a chuck that can be indexed to a predetermined pawl exchange position, and a number of holders that can hold the pawls in a removable manner in the sliding direction, and these holders are inserted into the sliding groove at the pawl exchange position. A claw storage magazine that can be indexed to a claw exchange position located on an extension line, and a claw locking portion from the sliding groove of the claw exchange position to the holder of the claw exchange position, or from this holder to the sliding groove, respectively. Nail transfer 17 that locks and allows the nail to move in a straight line! 1. An automatic chuck claw changing device comprising: a chuck claw removing device which operates the claw engaging device to disengage the slider member from the claw. 2. An overhang is provided at the tip of the rising portion rising in the sliding direction from the end face on the sliding direction side of the pawl so as to protrude toward the front or rear side of the pawl to constitute a locking portion of the pawl, In addition, a moving body is provided that moves parallel to a line connecting the sliding groove at the claw exchange position and the holder at the claw exchange position, and this moving body is provided between the overhanging piece of the claw at the claw exchange position and the end face of the claw. A patent characterized in that a claw moving device is constructed by providing a shim locking piece that can be entered and exited from the front side or rear side and that does not interfere with the rotation of the chuck or the claw storage machine when it is inserted between them. An automatic chuck jaw changing device according to claim 1.