JPS5976706A - Automatic exchanger of claw of chuck - Google Patents

Abstract

PURPOSE:To enable the exchange of a claw by a comparatively tiny device, by providing a claw storing magazine and a claw exchanger, in the automatic exchanger of the claw of a chuck holding a work according to the diameter of a holding part of the work. CONSTITUTION:Sliding grooves 10 and 11 in a radiusward direction are formed on a machine tool, for example, a main body of a chuck to be mounted on the front edge of a main spindle 3 of an NC lathe 1, and a sliding piece component 12 and a sliding part 13a of a claw 13 are fitted in each of the grooves 10 and 11. The sliding piece component 12 and the claw 13 are connected with and disconnected from the main body 6 of the chuck by providing a claw connecting device 18 within the main body 6 of the chuck. A table 29 which is moved in a lengthwise direction by a cylinder 30 is provided on the uppr part of a machine bed and a cylinder 34 moving vertically is provided on the front end side of the table 29 in an upright state. A circular rotor 51 of a claw storing magazine 50 is fitted over a tube component 36a of the cylinder 34 and the claws 13 held by a large number of holders on the external circumference of the magazine 50 are inserted into and separated from a chuck 5 by a claw exchanger 65 consisting of a guide block 66 and a transfering device 67 of the claw.

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 operator either replaces the jaws or replaces the chuck body. The reality is that replacing them requires a lot of effort and time, reducing productivity. Therefore, in order to automate the replacement of the jaws, a jaw storage magazine having a large number of holders is placed near the chuck, and the jaws stored in the holders of this jaw storage magazine are automatically exchanged with the jaws of the chuck. However, in this conventional exchange device, when the number of types of grasping diameters of the claws to be replaced increases, the number of holders must be increased according to the number of types, and the number of claw storage magazines has to be increased. There was a major problem in that the size of the device was large and its range of use was restricted.

Therefore, the main purpose of the present invention is to solve the above problems, and it is possible to significantly reduce the number of holders of the claw storage magazine compared to the number of types of gripping diameters that need to be replaced, thereby reducing the size of the device. It is possible.

Furthermore, the present invention aims to provide an automatic chuck jaw changing device that can be implemented at low cost.

Next, embodiments of the present application will be described based on the drawings. In the drawing, 1 is a well-known machine tool such as an NG lathe, 2 is its machine base, and 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 attached to the front end of the main shaft 3. As shown in FIG. 3, a wedge 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 wedge piece 7 is connected by a bolt 9 to a drawer (not shown) which is connected to a piston rod of a rotating cylinder 8 attached to the rear end of the main shaft 3. Further, in the radial sliding groove 1O111 (three shown in the drawing, but not limited to that number) formed in the chuck body 6, there is a sliding portion for the slider member 12 and the pawl 13. 13a are respectively fitted so as to be slidable in the radial direction, and a wedge portion 12a having a T-shaped cross section formed at the center of the slider member 12 forms a wedge groove 7a having a T-shaped cross section formed in the wedge piece 7. is mated to. In addition, the slider member 1
As shown in FIG. 4, a positioning hole 12b for positioning is formed on the outer periphery of 2. As shown in FIG. The claw 13 has a sliding portion 13.
Locking portions 14 for nail replacement are formed at symmetrical positions with respect to the center of a. This locking portion 14 is constructed by integrally providing an overhang piece 16 extending toward the rear side of the pawl 13 at the tip of a rising portion 15 that rises in the sliding direction from the end face of the sliding portion 13a of the pawl 13.

Also, rack teeth 17 are formed on the contact surface of the pawl 13, and the rack teeth 17 can be engaged with and disengaged from the slide member 12 by a pawl engaging device 18, which will be described below. This pawl engagement device 18 includes a meshing member 19 that is fitted into the slider member 12 so as to be slidable only in the front-rear direction, and a meshing member 19 that is fitted into the slider member 12 so as to be able to move only in the radial direction. Operation pin 20
It is equipped with Rack teeth 21 are formed on the front surface of this meshing member 19, and these rack teeth 21 are engaged with the rack teeth I7 of the pawl 13 by the spring force of the biasing spring 22. In addition, the engaging member 19 and the operating pin 20
are engaged with each other by engaging surfaces that are inclined with respect to the direction of the sliding force, 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 resists the biasing spring 22. When the rack teeth 21 are moved to a position where they do not engage with the rack teeth 17 by sliding them backward, and the operation pin 20 is returned to its original position and moved, the engaging member 19 is moved by the biasing spring 2.
2 to slide the rack tooth 21 forward to the rack tooth 1.
7 to a position where it engages. A set pin 23 is fitted into the meshing member 19 so as to be slidable in the front-rear direction, and the set pin 23 is urged forward by a spring 24 and prevented from coming out by a pin 25.
Normally, the tip of this set pin 23 is the rack tooth 1 of the pawl 13.
7. The quick change chuck 5 configured as described above moves the sliding groove 11 of the chuck body 6 to a predetermined jaw exchange position A (in the drawing, the upper part of the center of rotation is shown) by the action of an NC device (not shown). However, it is configured so that it can be indexed and stopped at any position such as diagonally above, lateral to, or below the center of rotation.

Next, 28 is a part formed in the upper part of the machine base 2 in the front-rear direction (second
The guide part 29 in the left-right direction in the figure is a table fitted to the guide part 28 so as to be slidable in the front-back direction. connected. Further, a stopper bolt 31 is screwed into the table 29 so as to be adjustable back and forth and is fixed by a lock nut 32, and the tip of the stopper bolt 31 comes into contact with a contact portion 33 formed on the machine base 2, so that the table 29 The forward end is positioned. A cylinder body 34a of an elevating cylinder 34 is fixed onto the table 29 with a mounting bolt 35, and its piston rod 34b is directed upward. The cylinder body 34a of this lifting cylinder 34 is a tube member 3
6a and a lid member 36b, a supply/discharge pipe 37 that protrudes into the tube member 36a is fixed to the center of the lid member 36b, and this supply/discharge pipe 37 is inserted into the insertion hole 38 for the piston 34c and the piston rod 34b. is inserted into. This supply and discharge pipe 37 is formed with a supply and discharge hole 40 for supplying and discharging pressure oil to the upper piston chamber through the communication hole 39.
Four supply and discharge holes are formed in b for supplying and discharging pressure oil to the lower piston chamber. A display shaft 42 having a dog 42a is planted on the upper end surface of the tube member 36a, and this display shaft 42 protrudes through an elevator frame to be described later. Further, a sliding hole 44 formed in a shaft member 43 is fitted onto the outer periphery of the tube member 36a so as to be slidable up and down while being prevented from rotating by a key 45. The tips of 34b are connected. A support frame 46 is integrally attached to the shaft member 43, and the support frame 46 and the shaft member 43 constitute an elevating frame 47. Limit switches 48 and 49 are respectively attached to the support frame 46 at positions above the shaft member 43.

One limit switch 48 is designed to detect the dog 42a of the display shaft 42 when the lifting frame 47 is raised to the highest level by the lifting cylinder 34, and the other limit switch 49 is configured to detect the dog 42a when the lifting frame 47 is lowered to its lowest position. When this occurs, the upper end surface of the tube member 36a is detected via a detection rod 49a. This limit switch 49
The mounting shaft portion 49b of the lifting frame No. 47" is screwed together so as to be vertically adjustable, and is fixed by a lock nut 49c.
The lower end of this mounting shaft portion 49b abuts against the upper end of the tube member 36a to position the lower end of the elevating frame 47.

Next, 50 is the claw 13 of the quick change chuck 5.
This is a nail storage magazine for storing a large number of nails 13 for replacement. 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 member 43.

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, a sliding portion 1 of a pawl 13 that can be fitted into the sliding groove 11 is provided.
A large number of holders 100 capable of holding the holders 3a in a manner that allows them to be pulled out in the sliding direction are provided at regular intervals. This holder 100 has a rotating body 51 as shown in FIGS.
A holding body 101 is mounted to be rotatable about an axis perpendicular to the rotational axis of the rotary body 51, and the sliding portion 13a of the claw 13 is fitted into the front surface of this holding body 101 so that it can be inserted and removed freely. It consists of a holding groove 102 formed to be able to hold the holding groove 102, and a locking tool 103 attached to the holding body 101 so that the claw 13 fitted in the holding groove 102 can be locked and held. This locking tool 103 is composed of two locking pins 106 that are embedded in the bottom surface of the holding groove 102 so as to be freely protrusive and retractable, are biased in the projecting direction by a locking spring 104, and are prevented from coming out by a pin 105. . Note that this locking tool 103 may be constructed of a retaining plate to prevent the pawl 13 from falling, and a portion of this retaining plate may be moved by a cylinder or the like to enable the pawl to be replaced. good. The tip of the locking pin 106 is formed into a chevron shape when viewed from the side, similar to the set pin 23 of the quick change chuck 5.
7 so that it can be pushed in. An engagement groove 107 is formed on the rear end surface of the holding body 101 and extends through the rotation axis of the holding body 101 and perpendicular to the direction of the holding groove 102.
is formed. Further, the holding body 101 has the holding groove 102 vertically moved by a well-known latch mechanism 108.
The engagement groove 107 is configured to be prevented from rotating in a horizontally oriented position. The retaining groove 102 has a replacement claw 1.
The sliding portion 13a of No. 3 is fitted and held in place by a locking pin 106. In this case, the winter melon 13 is
The position is set so that the center of a is the center of rotation of the holder 100. A gear 58 is fixed to the rotating body 51, and a driving gear 60 attached to a rotating shaft 59a of a motor 59 fixed to the support frame 46 is meshed with the gear 58. Further, dogs 61 and 62 are fixed to the upper side of the rotating body 51 in correspondence with each holder 53, and a limit switch 6 for deceleration detecting one of the dogs 61.
3 and a stop limit switch 64 for detecting the other dog 62 are sequentially attached to the lower end of the support frame 46. When the limit switch 63 detects the dog 61, it switches the motor 59 to decelerated rotation, and when the limit switch 64 detects the dog 62, it stops the rotation of the motor 59, thereby causing the table 29 to move forward in the holding groove 102 of each holder 100. In a state in which the elevating frame 47 is located at the end and the elevating frame 47 is at the lower end (hereinafter referred to as the replacement preparation state), it is indexed to a predetermined pawl exchange position B located on the extension line of the sliding groove 11 of the pawl exchange position A. It has become. Further, a reversing device 1 for reversing the holder 100 by 180 degrees is provided behind the holder 1oO at the claw exchange position B.
09 is installed. This reversing device 109 includes an actuator 110 fixed to the shaft member 43. The rotation axis 111 of the actuator 110 is configured to rotate forward and reverse by 180 degrees, and is positioned so that its rotation axis is on the same line as the rotation axis of the holder 100. This rotating shaft has an engaging piece 1 that engages with the engaging groove 107 at the pawl exchange position B at the moving end in one turn.
12 is fixed, and by reversing this rotation axis 111, the holder lo is fixed.

can be reversed. In addition, the above-mentioned holding body 1
An engagement piece is provided on the rear end surface of 01, and an engagement groove 1 is provided on the rotation shaft 111.
07 may be provided.

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 100 at the pawl exchange position B, or from this holder 100 to the sliding groove 11, respectively. It is composed of a guide block 66 and a claw moving device 67 as shown. The guide block 66
is fixed to the lower end of the shaft member 43. This guide block 66 has these sliding grooves II and holding grooves 102 in a portion located between the sliding groove 11 at the pawl exchange position A and the holder 100 at the pawl exchange position B in the replacement preparation state. A guide groove 68 that is substantially continuous in a straight line is formed. , this guide groove 68 is similar to the sliding groove 11 and the holding groove 1.
Like 02, it is formed in a cross-sectional shape that can guide the sliding portion 13a of the pawl 13, and the upper and lower ends are formed to slightly diverge so that the pawl 13 can be easily guided into the guide groove 68. The guide groove 68 is preferably set to have at least the same length as the sliding portion 13a of the claw I3 so that the sliding portion 13a of the claw I3 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 the piston rod 7o thereof is positioned so as to protrude downward above the holder 100 at the pawl exchange position B. There is. A movable body 71 is fixed to the tip of the piston rod 70, and a locking piece 74 is inserted into two guide grooves 72 and 73 in the front and rear directions formed in the movable body 71 as shown in FIGS. 3 and 6. The operation pieces 75 are fitted together so as to be movable in the front and rear directions. Both ends of a link 76 whose intermediate portion is pivotally connected to the movable body 71 are connected to the locking piece 74 and the operation piece 75 by pins, respectively. Further, the operating piece 75 is biased rearward by a spring 77 that is pressurized between the movable body 71 and the locking piece 7.
The locking portion 74b of the locking piece 74 is prevented from coming out by coming into contact with the movable body 71, and normally the operating portion 75a of the operating piece 75 projects rearward, and the engaging portion 74a of the locking piece 74 projects forward. The engaging portion 74a of the locking piece 74 is such that the piston rod 70 of the moving cylinder 69 is in the seventh position in the replacement preparation state.
As shown in the figure, when moved to the lowest end, it is located between the overhanging piece 14 of the claw 13 at the claw replacement position A and the end surface of the claw,
When the piston rod 70 is moved to the uppermost end, it is positioned between the protruding piece 14 of the pawl 13 at the pawl exchange position B and the pawl end surface. In addition, the operation section 7 of the operation piece 75
5a is moved through passage grooves 78 and 79 formed at the bottom of the holding groove 102 and the guide groove 68. A 9°' two-operation guide piece 80 is disposed within the passage groove 79 of the guide block 66 and is held movably in the front-back direction by the guide plotter 66. This operation guide piece 80 is moved back and forth by a claw removing cylinder, which will be described later. When the piston rod 70 of the moving cylinder 69 is lowered, the operation guide piece 80 is moved to the forward end as shown in FIG. The piece 75 is moved forward against the spring 77, whereby the locking piece 7
4, the engaging portion 74a of the claw 13 at the claw replacement position A
The above piston ron door 0
is moved to the reverse end as shown in FIG. 7 when it is located at the descending end, thereby releasing the forward guidance of the operating piece 75 and moving the engaging portion 74a of the locking piece 74 to the pawl exchange position. It can be inserted from the rear side between the protruding piece 14 of the claw 13 of A and the end face of the claw. 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 71
A stopper shaft 120 is screwed onto the holder, and the stopper shaft 120 is inserted through a hole 121 formed in the flange portion 69a of the moving cylinder 69. Nuts 122 and 123 for positioning the lower end and the upper end of the piston rod 70 are screwed into the stopper shaft 120, respectively.

Next, reference numeral 81 denotes a claw removing device for operating the claw engaging device 18 of the quick change chuck 5 to disengage the slider 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.
A piston 82b is fitted in the piston 82b so as to be movable up and down, and a piston rod 84 is connected to the 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 piston rod 84, and a As shown in Fig. 4, a hollow cylindrical suppressing pin 86 is provided protrudingly.This suppressing pin 86 is positioned so as to face the end surface of the operating pin 20 of the slider member 12 at the pawl exchange position A in the replacement preparation state. The piston rod 84 of the claw removing cylinder 82
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 rack teeth 21.
is moved to a rear position where it does not engage with the rack teeth 17 of the pawl 13. Further, the mounting piece 85 has a fifth
As shown in the figure, a positioning pin 87 for positioning the slider member 12 at the claw replacement position A is provided in a protruding manner. 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 position the slider member 12 at a predetermined index 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 upper and lower ends of the piston rod 84 can be detected. A guide tube 91 fixed to the guide plotter 66 is inserted into the hollow hole 86a of the suppressing pin 86.
The suppression pin 86 and positioning pin 87 are connected to the piston rod 84
It is prevented from rotating around the center. Furthermore, an inclined groove 92 having a T-shaped cross section is formed in the mounting piece 85, 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 groove 92. There is.

Next, reference numeral 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; It is constituted by a proximity switch 95 provided in the tube hole 91a. 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 it cannot detect the operating pin 20 when the operating pin 20 is pushed in by the pressing pin 86. The position is set so that it will not be possible to obtain Note that 96 is a cover attached to the front end of the support frame 46, and a proximity switch 97 for detecting the presence of the claw 13 at the claw replacement position A is attached to the lower end. Further, a proximity switch 98 is attached to the front end of the shaft member 43 for detecting the presence of the claw 13 at the claw replacement position B.

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 claw replacement command is sent from a separately installed command device due to a change in the workpiece, etc., the rotation of the spindle 3 is stopped in response to the command, and one of the claws 13 is moved to a predetermined claw replacement position A. Figure out. Further, the rotating cylinder 8 moves the wedge piece 7 forward and moves the three claws 13 of the quick change chuck 5 to the open position. Next, the longitudinal cylinder 30 is operated to move the table 29 to the forward end as shown in FIG. 2, and the lifting cylinder 34 is operated to lower the lifting frame 47 to the lowering end. The forward end of the table 29 and the descending end of the elevating frame 47 are accurately positioned by the action of the stopper bolt 31 and the mounting shaft 49b, so that one of the holders 100 of the claw storage magazine 50 is accurately positioned at the claw exchange position B. The guide groove 68 of the guide block 66 is located between the sliding groove 11 of the pawl 13 at the pawl exchange position A and the holder 10 at the pawl exchange position B.
It is accurately positioned between the holding groove 102 of No. 0 so as to be substantially continuous with these in a straight line, and is ready for replacement. In addition,
The rotating body 51 of the claw storage magazine 50 is indexed and rotated in advance by a motor 59, and an empty holder 100 for storing the claws 13 at the claw exchange position A is indexed to the claw exchange position B. Empty holder 1 in the above nail storage magazine 50
The indexing of 00 may be performed after the longitudinal movement cylinder 30 and the elevating cylinder 34 are operated. Next, the moving cylinder 69 of the claw moving device 67 is activated to lower the moving body 71.

In this case, the claw removing cylinder 82 of the claw removing device 81 is
As shown in FIG. 4, the piston 82b is maintained at the rising end, causing the operation guide piece 80 disposed in the passage groove 79 of the guide block 66 to protrude forward. Therefore, when the movable body 71 is lowered as described above, the operating portion 75a of the operating piece 75 engages with the operating guide piece 80 and moves forward, as shown in FIG.
is moved rearward, and the engaging portion 74a and the claw 1 at the claw replacement position A
Interference with the overhanging piece 16 of No. 3 is prevented, and when the movable body 71 is positioned at the lower end, the engaging portion 74a is located at the rear between the claw end face of the claw exchange position A and the overhanging piece 16. Next, the claw removing cylinder 82 of the claw removing device 81 operates to remove the mounting piece 85.
is lowered, thereby causing the pressing pin 86 to engage the claw engaging device 18.
Push the operating pin 20 toward the center of the chuck to remove the engaging member 1.
9 is moved backward as shown in FIG. 7, and the rack teeth 21 of this meshing member 19 and the rack teeth 17 of the pawl 13 are disengaged from each other. In addition, as mentioned above, the rack teeth 21 and the rack teeth 17
Since the set pin 23 is engaged with the rack teeth 17 of the pawl 13 by the force of the spring 24 even if the pawl 13 is disengaged from the pawl 13 at the pawl exchange position A, it will not fall out from the sliding groove 11. Prevented. Further, as the mounting piece 85 is lowered, the positioning pin 87 is fitted into the positioning hole 12b of the sliding member 12 as shown in FIG. 8, and the relative position between the guide block 66 and the chuck body 6 is determined with high precision. Guide groove 68
and the sliding groove 11 at the pawl exchange position A are accurately opposed to each other. Further, when the mounting piece 85 is lowered as described above, the operation guide piece 80 is moved rearward, thereby causing the pawl moving device 67
When the operation piece 75 is moved backward by the spring 77, the locking piece 74 is moved forward, and the locking portion 74Ll
is fitted between the end surface of the claw 13 at the claw replacement position A and the overhanging piece 16. Next, the moving cylinder 69 operates to move the moving body 7.
1 is raised, whereby 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 1 is raised.
Raise 3. Therefore, as shown in FIG.
-8 and is fitted into the holding groove 102 at the pawl exchange position B, and the locking pin 10 is fitted into the holding groove 102.
6 &: Therefore, it is locked and held. Next, 59 motors
It is operated to index and rotate the rotating body 51 of the claw storage magazine 50, and index the empty holder 100 to the claw exchange position B for storing the next claw 13 of the quick change chuck 5.

Further, the claw removing cylinder 81 is actuated to raise the mounting piece 85, whereby the pressing pin 86 releases the pressing of the operation pin 20, and the positioning pin 87 is removed from the positioning hole 12b. When the suppressing pin 86 releases the pressing of the operating pin 20 as described above, the engaging member 19 of the claw engaging device 18 is moved back forward by the biasing spring 22, and at the same time, the operating pin 20 is moved back toward the outer circumferential side of the chuck. be done. In this case, the proximity switch 95 of the engagement confirmation device 94 is
0 is detected to confirm whether the operation pin 20 has been completely returned to its original position, and based on this confirmation signal, the quick change chuck 5 is indexed and rotated again to move the next jaw 13. Index the groove 11 to the pawl replacement position A. Thereafter, the above operation is repeated to hold the three claws 13 of the quick change chuck 5 in the holder 102 of the claw storage magazine 50. After the third pawl 13 is held in the pawl storage magazine 50 as described above, the pawl removal cylinder 81 operates to raise the mounting piece 85, and when the proximity switch 95 detects the operating pin 20, The quick change chuck 5 is indexed and rotated to index the sliding groove 11 of the first removed pawl 13 to the pawl exchange position A again. Also, the motor 59
rotates the rotary body 51 of the claw storage magazine 50 and splits the holder 102 holding the claws 13 to be fitted into the sliding grooves 11 at the claw exchange position A to the claw exchange position B as shown in FIG. put out. Holder 1 holding the claw 13 as described above
00 is indexed to the claw replacement position B, this holder 10
The engaging portion 74a of the claw moving device 67 is automatically positioned between the protruding piece 16 of the claw 13 and the end face of the claw. Next, depending on the required grasping diameter of the claw 13, the claw 1 at the claw replacement position B is
3, the actuator 110 of the reversing device 109 operates to reverse the engaging piece 112, thereby reversing the holding body 101 of the holder 100 and reversing the claw 13.

In this case, the center of the sliding portion 13a of the claw 13 is located at the holder 10.
Since the claw 13 is held so as to be located at the center of rotation of the
The engaging portion 74a of the locking piece 74 is automatically engaged between the overhanging piece 16 on the opposite side and the claw end surface. Next, the claw release cylinder 82 is actuated to lower the mounting piece 85, which causes the pressing pin 86 to push the operating pin 20 again and close the engaging member 19.
is moved backward, and the positioning pin 87 is fitted into the positioning hole 12b to determine the relative position of the guide block 66 and the chuck body 6. Next, the moving cylinder 69 is actuated to lower the moving body 71, whereby the claw 13 held in the holder 100 at the claw replacement position B is pushed out from the holding groove 102 by the locking piece 74 and then into the guide groove. 68 and is fitted into the sliding groove 11 at the pawl exchange position A, and is locked and held by the set pin 23 while being fitted into the sliding groove 11. When the claw 13 fitted into the holding groove 102 is fitted into the sliding groove 11 as described above, the claw 13
Since the position of the pawl 13 is corrected by being guided by the guide groove 68, the pawl 13 can be reliably fitted into the sliding groove 11.

Further, when the movable body 71 is lowered as described above, the claw release cylinder 82 lowers the mounting piece 85 and the operation guide piece 8
0 is moved backward, the operation section 7 of the operation piece 75
5 a is not pushed forward by the operation guide piece 80 , and the locking portion 74 a of the locking piece 74 is connected to the locking portion 14 of the claw 13 .
It will never come off. Next, the claw release cylinder 82 is operated to raise the mounting piece 85, thereby causing the pressing pin 86 to rise.
The pressing of the operation pin 20 is released, and the positioning pin 87 is removed from the positioning hole 12b. Therefore, the claw engaging device 1
The meshing member 19 of No. 8 is moved back forward by the biasing screw 22 so that its rack teeth 21 are moved to the pawl 13 at the pawl exchange position A.
The operating pin 20 is engaged with the rack teeth 17 of the chuck, and the operating pin 20 is moved back toward the outer circumferential side of the chuck. In this case, if the rack teeth 21 of the meshing member 19 are reliably engaged with the rack teeth 17 of the pawl 13, the operating pin 20 is completely returned, and the second operating pin 2
0 can be detected by the proximity switch 95, but if the engagement between the rack teeth 21 and the rack teeth 17 is uncertain for some reason, the return movement of the operating pin 20 will be incomplete, and the operating pin 20 will be It is no longer detectable by the proximity switch 95, and it is reported that the engagement of the rack teeth 21.17 is uncertain. As mentioned above, the claw removing cylinder 82
When the mounting piece 85 is lifted up, the operation guide piece 80
is moved forward to engage the engaging portion 74a of the locking piece 74 with the claw 13.
from the locking part 14. Next, the moving cylinder 69 is operated to move the moving body 71 to the rising end.

After that, the quick change chuck 5 is indexed and rotated to index the sliding groove 11 of the second removed pawl 13 to the pawl exchange position A, and the motor 59 rotates the rotary body 51 to place it in the pawl exchange position A. The holder 100 holding the claw 13 to be fitted into the sliding groove 11 is indexed to the claw replacement position B. Thereafter, the claws 13 of the claw storage magazine 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 small 13 is fitted into the sliding groove 11 as described above, and then the moving body 71 and the mounting piece 85 are raised.

In this case, the motor 59 rotates the rotating body 51 and the claw 13 is first rotated.
Move the empty holder 100 from the position where it was removed to the claw replacement position B.
to prepare for the next nail replacement. After that, the lifting cylinder 34 is activated to raise the lifting frame 47, and the forward/backward movement cylinder 30 is activated 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, each sliding groove 11 is fitted with a claw 13.
The pawl 13 may be fitted into the sliding groove 11 each time the pawl 13 is removed.

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 attached to the rear end of the main shaft. The pawl engaging device can be constructed so that it can be moved backward by a cylinder or the like as a provided pawl removing device, or the pawl engaging device can be configured so that the pawl can engage and disengage the slider member at multiple locations simultaneously. It is clear that the pawl engaging device may be configured such that the slider member and the pawl can be engaged and disengaged by rotating the operation pin.

In addition, the claw storage magazine may be one in which a holder is provided on an endless moving body such as those used in tool magazines, or a holder is provided in the radial direction on the upper surface of the outer periphery of a rotating body, and the axis of rotation of this rotating body is rotated by 90 degrees. It may also be something that can be moved. The claw engaging device may be of any type as long as the claws can be replaced; for example, a rack rod that is linearly moved by a motor may have a locking piece or a grip at its tip, or a rack rod that is rotatably supported in the middle. The exchange arm may be provided with grips at both ends. In particular, if a position-controllable drive means such as a servo motor or digital cylinder is used to move the locking piece, it will be possible to easily change the outer diameter of the chuck, and It is preferable that the engagement position between the member and the member can be changed to an arbitrary position.

Furthermore, in the present application, the guide block of the above embodiment may be omitted, and the claws may be replaced directly from the sliding groove of the chuck to the holder of the claw storage magazine.

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, the slider member can be replaced from the sliding groove to the holder and/or from the holder to the sliding groove using an eight-person changing device, and then the pawl and slider member can be re-engaged. Therefore, the jaws of the chuck can be mechanically replaced with the jaws stored in the jaw storage magazine according to the desired grasping diameter, making it possible to perform unmanned machining. In addition, the holder of the above-mentioned claw storage magazine is
It is configured to be able to rotate 80 degrees.

This has the advantage that the holder can be made smaller, or a smaller claw storage holder can accommodate a wide variety of gripping diameters. In addition, as mentioned above, since the holder itself can be rotated 180 degrees to reverse the claws, the device required for reversing the claws can be simple and can be implemented at low cost. be.

[Brief Description of the Drawings] The drawings show an embodiment of the present application, and FIG. 1 is a sectional view with some parts omitted, FIG. 2 is a sectional view showing the operating state of FIG. 1, and FIG. 3 is a sectional view showing the operating state of FIG. is a front view of Fig. 2, and Fig. 4 is a front view of Fig. 2.
5 is a sectional view taken along the line IV, and Figure 5 is a sectional view taken along the ■-v line in Figure 2.
Fig. 7 is a partial view showing the operating state of Fig. 2, Fig. 8 is a sectional view showing the operating state of Fig. 4, Fig. 9 is a sectional view showing the operating state of Fig. 2, and Fig. 10. 11 is a partial view showing the nail exchange position of the nail storage magazine, and FIG.
It is an I line sectional view. 3... Main spindle, 5... Quick change chuck (
chuck), 6... chuck body, 1o, 11
...Sliding groove, 12... Slider member, 13... Claw, 50... Claw storage magazine, 65... Changing device, 81... Claw removal device, 100... Holder. Patent Applicant: Howa Kogyo Co., Ltd. Figure 4 Figure 8 Figure 5 Figure 7 Figure 10 Figure 11 +4 1t) 1. Indication of the case 1986 Patent Application No. 18639
No. 5 No. 2, Title of the invention Automatic chuck jaw changing device 4
, Date of amendment order Voluntary 5, Number of inventions increased by amendment None The scope of claims column is amended as shown in the attached sheet. "Circular" on page 9, line 15 of the narrow strip is corrected to "polygon.""Also, the above... ...stop,'' should be corrected as follows. Furthermore, display bodies 61 and 62 are fixed to the upper side of the rotary body 51 in correspondence with each holder 〇, and a proximity switch 63 for deceleration detects one display body 61 and a deceleration proximity switch 63 detects the other display body 62. A stop rigid contact switch 64 is attached to the lower end of the support frame 46.
When the lR indicator 61 is detected, the motor 59 is switched to decelerated rotation, and when the proximity switch 64 detects the indicator 62, the rotation of the motor 59 is stopped. "It is fixed to this shaft..." is changed to "In this turn 111, when the actuator 110 rotates and stands upright, the engagement groove 107 is in the pawl exchange position B. An engaging piece 112 to be fitted is fixed,
” he corrected. Figures 1, 2, 6, 8, and 9 of the 51 drawings will be corrected as shown in the attached sheet. Claim 1: A chuck body attached to the main shaft, a slider member and a pawl slidably fitted in a radial sliding groove in the chuck body, and the slider member and the pawl. a chuck having a pawl engaging device capable of engaging and disengaging the pawl, and capable of indexing the sliding groove of the pawl to a predetermined pawl replacement position; A claw storage magazine in which the holders are rotatable by 180 degrees by a reversing device and each holder can be indexed to a predetermined claw exchange position; It is equipped with a replacement device that allows the pawls to be replaced from the holder into the sliding grooves, and a pawl removal device that allows the pawl engaging device to be operated to disengage the sliding member from the pawl. An automatic chuck jaw changing device consisting of: 2. A large number of holders are mounted on the outer periphery of the rotating body so as to be rotatable by 180 degrees, and a reversing device is provided that engages with these holders at the claw exchange position to rotate the holders by 180 degrees; The chuck jaw according to claim 1, characterized in that the jaw storage magazine is constructed by providing a rotation device of twelve rotors and a position detection device so as to index the holder to a predetermined jaw exchange position. Automatic exchange device. 3. Provide an engagement groove or engagement piece on the rear end surface of the holder that passes through the rotation axis of the holder, and replace the claw with the rotation axis of the rotation axis of the reversing device that has a rotation axis that can rotate 180 degrees. The rotation axis of the holder is arranged so that it is on the same line as the rotation axis of the holder in the position, and the engagement groove
Claim 1, characterized in that the holder is provided with an engaging piece or an engaging groove that fits into the engaging piece, so that the holder can be rotated 180 degrees by the rotating shaft of the reversing device. chuck jaw automatic exchange device. Figure 6 Figure 8

Claims (1)

[Claims] 1. A chuck body attached to the main shaft, a slider member and pawl slidably fitted in a radial sliding groove in the chuck body, and the slider member and pawl. a chuck having a pawl engaging device capable of engaging and disengaging the pawl, and indexing the sliding groove of the pawl to a predetermined pawl replacement position; A claw storage magazine in which the holders are rotatable by 180 degrees using a reversing device, and each holder can be indexed to a predetermined claw replacement position;
A changing device that allows the nail to be replaced from the sliding groove at the pawl exchange position to the holder at the pawl exchange position and/or from this holder to the sliding groove, and a sliding member by operating the pawl engaging device. An automatic chuck jaw changing device comprising: and a jaw removing device capable of disengaging the jaws. 2. A large number of holders are mounted on the outer periphery of the rotating body so as to be rotatable by 180 degrees, and a reversing device is provided that engages with these holders at the claw exchange position to rotate the holders by 180 degrees; The claim is characterized in that the nail storage magazine is constructed by providing a rotary body rotation device and a position detection device so that the holder can be indexed to a predetermined nail replacement position at either end of rotation. The automatic chuck jaw changing device according to item 1. 3. Provide an engagement groove or engagement piece on the rear end surface of the holder that passes through the rotation axis of the holder, and replace the claw with the rotation axis of the rotation axis of the reversing device that has a rotation axis that can rotate 180 degrees. The rotating axis of the reversing device is arranged so that the axis of rotation of the holder is on the same line as the rotating axis of the holder, and the rotating axis of the reversing device is provided with an engaging piece or an engaging groove that fits into the engaging groove or engaging piece of the holder. 2. The automatic chuck jaw changing device according to claim 1, wherein the holder can be rotated 180 degrees by a rotating shaft of the reversing device.