JPH0255162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a positioning device for a chuck storage magazine in an automatic chuck pawl changing device that automatically replaces a chuck pawl that grips a workpiece with a pawl corresponding to the grasping diameter of the workpiece. It is something.

Prior art and its problems In conventional chucks, the shape of the workpiece,
When it becomes necessary to replace the chuck in response to a change in dimensions, the worker must replace the chuck or replace the chuck itself, and replacing the chuck requires a lot of effort and time, reducing productivity. The reality is that this is decreasing. Therefore, in order to automate the replacement of the claws, between the chuck and the claw storage magazine,
Like a general tool changer, the middle part of the exchange arm is rotatably supported, and grippers provided at both ends of the exchange arm grip the chuck pawl and the pawl of the pawl storage magazine. A replacement device has been proposed, but such a replacement device requires considerably high machining accuracy and stopping accuracy of the pawl storage magazine, and for this purpose a separate actuator is provided to position the pawl storage magazine. It is possible to do this, but this poses problems such as increasing the size of the device.

Purpose and Overview The present invention aims to solve the above-mentioned problems, and indexes a pawl storage magazine by utilizing the action of a pawl release cylinder that disengages the pawl from the sliding member of a so-called quick change chuck. Can increase accuracy,
It is an object of the present invention to provide a compact and inexpensive positioning device for a chuck storage magazine in an automatic chuck pawl changing device, which allows extremely smooth pawl replacement.

First Embodiment In the drawings, 1 is a well-known machine tool such as an NC
A lathe, 2 is its machine base, 3 is a main spindle, and an automatic chuck pawl changing device 4 is implemented in this machine tool.
Next, this automatic chuck pawl changing device 4 will be explained. Reference numeral 5 denotes a quick change chuck, the chuck body 6 of which is integrally attached to the front end of the main shaft 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 axis of rotation of the chuck body 6. This wedge piece 7 is connected by a bolt 9 to a drawbar (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 grooves 10 and 11 (three shown in the drawing, but the number is not limited) formed in the chuck body 6, slider members 12 and pawls 13 are provided for sliding. The wedge portion 12a having a T-shaped cross section formed at the center of the slider member 12 is fitted into the wedge portion 12a having a T-shaped cross section formed in the wedge piece 7. It is fitted into the groove 7a. Further, on the outer periphery of the slider member 12, as shown in FIG.
is formed. The pawl 13 is formed with a locking portion 14 for changing the pawl. This locking portion 14 is constructed by integrally providing an overhanging 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 outer end surface of the pawl 13 on the sliding direction side. . Claw 13
Rack teeth 17 are formed on the rear surface, and these rack teeth 17 engage with and disengage from the slide member 12 by means of a claw engaging device 18, which will be described below.
This pawl engagement device 18 includes an engaging member 19 that is fitted into the sliding member 12 so as to be able to slide only in the front-rear direction.
and an operating pin 20 fitted within the slider 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, and these rack teeth 21 are adapted to be engaged with the rack teeth 17 of the pawl 13 by the spring force of a biasing spring 22. The engaging member 19 and the operating pin 20 are engaged with each other by engagement surfaces that are 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. When the meshing member 19 is slid backward against the biasing spring 22 to move the rack teeth 21 to a position where they do not engage with the rack teeth 17, and when the operation pin 20 is returned to its original position and moved, the meshing member 19 is moved. Biasing spring 22
The lock teeth 21 are slid forward by the lock teeth 17 to move the lock teeth 21 to a position where they engage with the rack teeth 17. A set pin 23 is fitted into the meshing member 19 so as to be slidable in the front-rear direction, and this set pin 23 is urged forward by a spring 24 and is prevented from coming out by a pin 25. The tip of 23 is adapted to be engaged with the lock tooth 17 of the pawl 13. The quick change check 5 configured as described above is not shown.
The action of the NC device moves the sliding groove 11 of the chuck body 6 to a predetermined pawl replacement position A (the figure shows the upper part of the rotation center, but it can be moved diagonally upward, laterally, or downward from the rotation center). etc.) and can be stopped at any position.

Next, 28 is a guide part in the front-rear direction (left-right direction in FIG. 1) formed on the upper part of the machine base 2, and 29 is a table fitted to this guide part 28 so as to be slidable in the front-rear direction. Forward and backward motion cylinder 3 fixed on stand 2
0 longitudinal piston rods 30b are 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.
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 onto the table 29 with a mounting bolt 35, and its piston rod 34b is directed upward. The cylinder body 34a of the elevating cylinder 34 consists of a tube member 36a and a lid member 36b, and a supply/discharge pipe 37 that protrudes into the tube member 36a is fixed to the center of the lid member 36b. It is fitted into the fitting holes 38 of the piston 34c and piston rod 34b. 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, and the cover member 36b
A supply and discharge hole 41 for supplying and discharging pressure oil to the lower piston chamber is formed in the lower piston chamber. The tube member 36a
A display shaft 42 having a dog 42a is planted on the upper end surface of the display shaft 42, and this display shaft 42 protrudes through an elevator frame which will be described later. Further, a sliding hole 44 formed in the shaft portion 43a of a shaft member 43 is fitted onto the outer periphery of the tube member 36a so as to be vertically slidable while being prevented from rotating by a key 45. Part 4
The tip of the piston rod 34b is connected to the upper end of the piston rod 3a. A support frame 46 is integrally attached to the shaft portion 43a of 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 attached to the support frame 46 above the shaft member 43, respectively. One limit switch 48 is adapted 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 adapted to detect the dog 42a when the lifting frame 47 is lowered to the lowest position. The upper end surface of the tube member 36a is detected via a detection frame 49a. The mounting shaft 49b of the limit switch 49 is screwed into the lifting frame 47 in a vertically adjustable manner and is fixed by a lock nut 49c. It is designed to position the descending end of.

Next, 50 is the quick change check 5 mentioned above.
This is a nail storage magazine for storing a large number of nails 13 to be replaced with the nails 13 of. In this claw 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 43.
The axis of rotation of this rotating body 51 is the sliding groove 11 at the pawl exchange position A in the quick change chuck 5.
It is set parallel to the sliding direction of.
On the outer periphery of the rotary body 51, a large number of holders 53 are provided that can hold the sliding portion 13a of the claw 13 that can be fitted into the sliding groove 11 so as to be removable in the sliding direction.
are provided at equal intervals. This holder 53 locks and holds the pawl 13 fitted in the vertical holding groove 54 formed on the outer periphery of the rotating body 51 so that the sliding portion 13a of the pawl 13 can fit therein. It is composed of a holder 55. This retainer 55 is composed of two locking pins 55a that are embedded in the bottom of the retaining groove 54 so as to be freely protruding and retractable, are urged in the projecting direction by a spring 56, and are prevented from coming off by a pin 57. has been done. The tips of these locking pins 55a are formed in a chevron shape when viewed from the side, similar to the set pin 23 of the quick change chuck 5, and when the pawl 13 is inserted into or removed from the holding groove 54, the lock teeth 17 of the pawl 13 It's starting to get pushed in. The sliding portion 13a of the replacement pawl 13 is fitted into the holding groove 54, and the locking pin 55
It is locked and held by a. The rotating body 51
A gear 58 is formed on the gear 58, and a rotating shaft 59a of a motor 59 fixed to the support frame 46 is connected to the gear 58.
A drive gear 60 attached to the drive gear 60 is meshed with the drive gear 60 .
Further, each holder 5 is provided below the rotating body 51.
A deceleration limit switch 63 for detecting one dog 61 and a stop limit switch 64 for detecting the other dog 62 are attached to the lower end of the shaft member 43 in sequence. installed.

When the limit switch 63 detects the dog 61, the motor 59 is switched to decelerated rotation, and when the limit switch 64 detects the dog 62, the motor 59 is switched to a decelerated rotation mode.
9 is stopped, thereby each holder 53
The holding groove 54 is located on the extension line of the sliding groove 11 at the pawl exchange position A when the table 29 is located at the forward end and the lifting frame 47 is located at the lower end (hereinafter referred to as the replacement preparation state). It is designed to index and stop at a predetermined pawl exchange position B (Fig. 6).

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 B, or from this holder 53 to the sliding groove 11, respectively. It is composed of a guide block 66 and a pawl moving device 67 as shown. The guide block 66 is connected to the shaft member 43.
is fixed to the lower end of the This guide block 66 has these sliding grooves 11 and holding grooves 54 in a portion located between the sliding groove 11 at the pawl exchange position A and the holder 53 at the pawl exchange position B in the replacement preparation state. Guide groove 6 substantially continuous in a straight line
8 is formed. This guide groove 68 is similar to the sliding groove 11 and the holding groove 54, and the sliding groove 1 of the pawl 13 is
3a is formed in a cross-sectional shape capable of guiding the upper part,
The lower end portion is formed to be slightly wider toward the tip so that the claw 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 so that the sliding groove 13a of the pawl 13 can be stably guided over approximately the entire length. Next, in the claw moving device 67,
Reference numeral 69 denotes a moving cylinder fixed to the support frame 46, and its piston rod 70 is positioned above the holder 53 at the pawl exchange position B so as to protrude downward. This piston rod 7
A movable body 71 is fixed to the tip of the movable body 71, and a locking piece 74 and an operating piece 75 are formed in two longitudinal guide grooves 72 and 73 formed in the movable body 71 as shown in FIG. It is fitted so that it can be moved to. 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. In addition, the operation piece 75
is biased backward by a spring 77 that is pressurized between the locking piece 74 and the movable body 71, and is prevented from coming out when the stop portion 74b of the locking piece 74 comes into contact with the movable body 71. The operation part 75a of the piece 75 is moved backward,
An engaging portion 74a of the locking piece 74 projects forward. Further, the operating portion 75a of the operating piece 75 is moved through passage grooves 78 and 79 formed at the bottom of the holding groove 54 and the guide groove 68. An operation guide piece 80 is disposed within the passage groove 79 of the guide block 66 and is held by the guide block 66 so as to be movable in the front-rear direction. This operation guide piece 80 is adapted to be 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. The piece 75 is moved forward against the spring 77, thereby moving the engaging portion 74a of the locking piece 74 to the pawl 13 at the pawl exchange position A.
When the piston rod 70 is located at the lower end, it is moved to the backward end as shown in FIG. 8, thereby guiding the operating member 75 forward. is released and the engaging portion 74a of the locking piece 74 is moved to the pawl 13 at the pawl exchange position A.
It is designed so that it can be inserted from the rear side between the overhanging piece 14 and the end face of the claw. In addition, the moving body 7
1 is screwed with a stopper shaft 100, and this stopper shaft 100 is inserted through a hole 101 formed in the flange portion 69a of the moving cylinder 69. Nuts 102 and 103 for positioning the lower end and the upper end of the piston rod 70 are screwed onto the stopper shaft 100, respectively.

Next, 81 is the quick change check 5.
The slide member 12 and the claw 1 are connected by operating the claw engaging device 18 of the slider member 12 and the claw 1.
This is a claw release device for disengaging from the engagement with 3.
In this claw removing device 81, 82 is a claw removing cylinder, and a piston 82b is fitted in a piston chamber 82a formed in the guide block 66 so as to be movable up and down.
and a rear piston rod 84a are connected to each other. This claw release cylinder 82 serves both as a positioning cylinder for the quick change chuck 5 and a positioning cylinder for a claw storage magazine, which will be described later.The piston rod 84 thereof is directed approximately toward the center of the chuck, and the rear piston rod 84a is connected to the shaft member 43. It passes through the lower end of and protrudes upward. A mounting piece 85 is fixed to the piston rod 84, and a hollow cylindrical pressing pin 86 is protruded from the mounting piece 85 as shown in FIG. This pressing pin 86 is positioned so as to face the end surface of the operating pin 20 of the claw 13 at the claw replacing position A in the replacement preparation state, and when 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 to move the meshing member 19 to a rearward position where its rack teeth 21 do not engage with the rack teeth 17 of the pawl 13. Furthermore, as shown in FIG. 5, a positioning pin 87 for positioning the claw 13 at the claw replacement position A is provided on the mounting piece 85 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 replacement position A in the replacement preparation state, and the piston rod 8
4 is moved to the lower end, this positioning pin 8
7 is fitted into the positioning hole 12b, and the slider member 12
is positioned at a predetermined index position. The above positioning pin 87 and positioning hole 12
b constitutes a positioning device together with the claw removing cylinder 82. Further, a display rod 88 is fixed to the mounting piece 85 as shown in FIG.
By operating a limit switch (not shown) fixed to the guide block 66, the dogs 89 and 90 fixed to the piston rod 8
The upper and lower ends of 4 can be detected. A guide tube 91 fixed to the guide block 66 is fitted into the hollow hole 86a of the pressing pin 86, and is prevented from rotating around the piston rod 84 by the pressing pin 86 and the positioning pin 87. has been done. Furthermore, an inclined groove 92 with a T-shaped cross section is formed in the mounting piece 85, and an inclined part 93 with 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, the positioning device 150 for the rotating body 51 in the claw storage magazine 50 will be explained. A positioning plate 151 is attached to the lower end of the shaft member 43, which is exemplified as a mounting board to which the rear rod side of the claw release cylinder 82 is attached, and a magazine positioning hole 152 is bored in this positioning plate 151. A hook portion 153 consisting of a protruding portion 153a and a groove portion 153b is formed at the tip of the rear piston rod 84a of the claw removing cylinder 82. On the other hand, stepped holes 154 are formed in the rotating body 51 in correspondence with the respective holders 53 at positions facing the positioning holes 152 of the magazine when the holders 53 are indexed to the pawl exchange position. There is.
Reference numeral 155 denotes a positioning member, which has a small diameter at the middle part, a large diameter at the upper end, and a positioning pin 156 at the lower end, and is secured to the stepped hole 154 by screws 157, so that it can slide in the vertical direction. It is fitted in and biased upward by a spring 158. The positioning pins 156 each protrude downward from the rotating body 51, and each positioning pin 156 has a position parallel to the hook portion 153 of the claw removing cylinder 81 when the corresponding holder 53 is indexed to the claw replacement position. Another hook portion 159 is formed to be engaged from the direction.

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; Pipe hole 91a
It is constituted by a proximity switch 95 provided inside. The 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 by the pressing pin 86, the operating pin 20 is detected. The position is set so that it cannot be detected. Note that 96 is a cover attached to the front end of the support frame 46, and a proximity switch 9 is provided at the lower end for detecting the presence of the claw 13 at the claw replacement position A.
7 is installed. 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, in the machine tool 1 having the above configuration, the claw 13 of the quick change chuck 5 is inserted into the claw storage magazine 5.
The operation when replacing the pawl 13 with the No. 0 pawl 13 will be explained. 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 in response to the command, and one of the jaws 13 is moved to a predetermined position for changing the jaws. Allocate to A. The rotating cylinder 8 also moves the wedge piece 7 forward and moves the three pawls 13 of the quick change chuck 5 to the open position. Rotating body 5 of claw storage magazine 50
1 is indexed and rotated in advance by a motor 59 to move the empty holder 53 to a predetermined position (guide block 66
guide groove 68 and holding groove 54 of empty holder 53
At the same time, the rear piston rod hook portion 153 of the claw removing cylinder 82 is
The hook portion 159 of the positioning pin 156 corresponding to the indexed holder 53 is engaged from the horizontal direction.

Next, after the longitudinal movement cylinder 30 is activated to move the table 29 to the forward end, the elevating cylinder 34 is activated to lower the elevating frame 47 to the descending end, and the stopper bolt 31 and the mounting shaft portion 49b are activated. As a result, the guide groove 68 of the guide block 66, the holding groove 54 of the empty holder 53 at the claw exchange position B, and the sliding groove 11 of the claw 13 at the claw exchange position A are aligned and substantially continuous. , it becomes ready for exchange. The empty holder 53 in the claw storage magazine 50 may be indexed 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
As shown in FIG. 6, the piston 82b is maintained at the rising end, and the passage groove 79 of the guide block 66
An operation guide piece 80 disposed inside is made to protrude forward. Therefore, as described above, the moving body 71
When the is lowered, the operation piece 75 is lowered as shown in FIG.
The operating portion 75a engages with the operation guide piece 80 and is moved forward, and thereby the locking piece 74 is moved rearward so that the engaging portion 74a and the overhanging piece 16 of the claw 13 at the claw exchange position A are moved. When interference is prevented and the movable body 71 is positioned at the lower end, the engaging portion 74a is located at the rear between the claw end surface of the claw replacement position A and the overhang piece 16. Next, the claw removing cylinder 82 of the claw removing device 81
is activated to lower the mounting piece 85, whereby the pressing pin 86 pushes the operating pin 20 of the claw engaging device 18 toward the center of the chuck, causing the engaging member 19 to retreat as shown in FIG. 19 and the lock teeth 17 of the pawl 13 are disengaged from each other. Note that even if the engagement between the rack teeth 21 and the rack teeth 17 is disengaged as described above, the set pin 23 remains engaged with the rack teeth 17 of the pawl 13 by the force of the spring 24, so that the pawl replacement position A is maintained. The claw 13 is the sliding groove 1
It will never fall off from 1. Also, the above mounting piece 8
5 lowers the positioning pin 87 to the slider member 1.
2, the relative positions of the guide block 66 and the chuck body 6 are determined with high precision, and the guide groove 68 and the sliding groove 11 at the pawl exchange position A are accurately opposed to each other. At the same time, the positioning pin 156 is lowered by the claw release cylinder 81 against the force of the spring 158 and is fitted into the positioning hole 152 to position the rotating body 51 with high precision, and the guide groove 68 of the guide block 66 and the holding groove 54 of the holder 53 at the claw exchange position B are accurately opposed to each other, and as a result, the guide groove 68, the holding groove 54, and the sliding groove 11 are aligned in a straight line. Further, when the mounting piece 85 is lowered as described above, the operation guide piece 80 is moved rearward, whereby the operation piece 75 of the pawl moving device 67 is moved rearward by the spring 77, and the locking piece 74 is moved backward. is moved forward, and its locking portion 7
4a is the claw end surface of the claw 13 at the claw replacement position A and the overhanging piece 1
It is fitted between 6. Next, the moving cylinder 69 is operated to raise the moving body 71, 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 13 is raise.
Therefore, as shown in FIG. 9, the pawl 13 at the pawl exchange position A is pulled out from the sliding groove 11 and then guided by the guide groove 68 and fitted into the holding groove 54 at the pawl exchange position B. 54 is locked and held by a locking pin 55a. Next, motor 5
9 operates to index and rotate the rotating body 51 of the nail storage magazine 50, index the empty holder 53 for storing the next nail 13 of the quick change chuck 5 to the nail exchange position B, and perform the same operation as described above. Claw removal cylinder 8
The hook portion 15 of the positioning pin 156 is attached to the hook portion 153 of No. 2.
9 engages. Further, the claw release cylinder 82 operates 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 pressing pin 86 releases the operation 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 operation pin 20 is returned to the outer circumferential side of the chuck. will be moved. In this case, the proximity switch 95 of the engagement confirmation device 94 detects the presence of the operating pin 20 and
0 is completely returned to the original position, and based on this confirmation signal, index and rotate the quick change chuck 5 again to move the sliding groove 11 of the next pawl 13 to the pawl exchange position A. Find out. After that, repeat the above operation until the quick change check 5-3
Holder 53 of claw storage magazine 50 with two claws 13
hold it. Make the third nail 13 as above.
is held in the claw storage magazine 50, the claw removal cylinder 82 is operated 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 again. The sliding groove 11 of the pawl 13 that was first removed is again indexed to the pawl replacement position A. Further, the motor 59 rotates the rotating body 51 of the claw storage magazine 50 to index the holder 53 holding the claw 13 to be fitted into the sliding groove 11 at the claw replacement position A to the claw replacement position B.
At this time, in the same way as when removing the claw, the claw removing cylinder 82
The hook portions 153 and 159 of the positioning pin 156 are engaged, and at the same time, the engaging portion 7 at the claw movement position at the rising end
The locking portion 14 of the pawl 13 is fitted onto 4a from the horizontal direction by index rotation. Next, the claw release cylinder 82 is actuated to lower the mounting piece 85, whereby the pressing pin 86 pushes the operating pin 20 again to move the engagement member 19 backward, and the positioning pin 87 is fitted into the positioning hole 12b. Also, positioning pin 1
56 is fitted into the positioning hole 152, and the rotating body 51
The relative positions of the holder 53 and the guide block 66 and the guide block 66 and the chuck body 6 are accurately determined. Next, the moving cylinder 69 operates to lower the movable body 71, thereby causing the claw 13 held in the holder 53 at the claw replacement position B to
As shown in FIG. 8, after being pushed out from the holding groove 54 by the locking piece 74, it is guided by the guide groove 68 and fitted into the sliding groove 11 at the pawl exchange position A. In the fitted state, they are locked and held by the set pin 23. In addition, as described above, the moving body 71
When the lever is lowered, the claw release cylinder 82 lowers the attachment piece 85 and moves the operation guide piece 80 backward, so the operation portion 75a of the operation piece 75 is pushed forward by the operation guide piece 80. Therefore, the locking portion 74a of the locking piece 74 never comes off from the locking portion 14 of the claw 13. Next, the claw release cylinder 82 is operated 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. Therefore, the engaging member 19 of the pawl engaging device 18
is moved back forward by the biasing spring 22 so that its rack teeth 21 are engaged with the rack teeth 17 of the pawl 13 at the pawl exchange position A, and the operation pin 20 is moved back toward the outer circumference of the chuck. In this case, when the lock teeth 21 of the meshing member 19 reliably engage with the rack teeth 17 of the pawl 13, the operating pin 20 is completely returned and the operating pin 20 can be detected by the proximity switch 95. 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 may not be detected by the proximity switch 95. It is reported that the engagement between the lock teeth 21 and 17 is uncertain. When the attachment piece 85 is raised by the claw removing cylinder 82 as described above, the operation guide piece 80 is moved forward and the engaging portion 74a of the locking piece 74 is disengaged from the locking portion 14 of the claw 13. Next, the moving cylinder 69 operates to move the moving body 7.
1 to the rising edge. Thereafter, the same operation as above is repeated to fit the claws 13 of the claw storage magazine 50 into the three sliding grooves 11 of the quick change chuck 5. In this way, the third pawl 13 is fitted into the sliding groove 11, and after the movable body 71 and the mounting piece 85 are raised, the motor 59 rotates the rotating body 51 and the pawl 13 is removed first. An empty holder 53 at the position is indexed to the nail replacement position B to prepare for the next nail replacement. Thereafter, 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, thereby moving the claw storage magazine 50 and changing device 65 from the quick change chuck 5. The nails are moved to a separate non-exchange position, completing a series of nail replacement operations.

Second Embodiment In FIG. 11, a bracket 251 is provided at the lower end of the shaft member 43 and between it and the rotating body 51.
A positioning pin 255, which is an example of a positioning member that slides in the horizontal direction, is attached to the bracket 251 and urged by a spring 258 in a direction away from the back surface of the holder 53 of the rotating body 51. At the rear end of this positioning pin 255 there is an engagement slope 2 that is inclined upwardly and toward the back surface of the holder 53.
53 is formed. On the other hand, on the back side of the holder 53 of the rotating body 51, a magazine positioning hole 252 is provided corresponding to each holder 53 at a position facing the tip of the positioning pin 255 at the claw exchange position.
is drilled. A slope 259 that engages and disengages from the engagement slope 253 of the positioning pin 255 is formed at the tip of the rear piston rod 84a of the claw release cylinder 82, and when the claw release cylinder 82 performs the claw release operation, this slope 259 engages and disengages from the engagement slope 253 of the positioning pin 255. Joint slope 253
, the tip of the positioning pin 255 is fitted into the positioning hole 252 of the magazine, and the claw storage magazine 5
The rotation body 51 of 0 is positioned.

Third Embodiment In FIG. 12, a bracket 351 is provided at the lower end of the shaft member 43 and between it and the rotating body 51.
A convex positioning member 355 is attached to swing by a pin 351a. A spring 358 biases the positioning engagement end 356a of the positioning member 355 away from the back surface of the holder 53. On the other hand, magazine positioning holes 352 are drilled on the back surface of the holders 53 of the rotating body 51, corresponding to the respective holders 53, at positions facing the right end of the positioning member 355 at the claw exchange position, as in the second embodiment. ing. At the tip of the rear piston rod 84a of the claw release cylinder 82, an engaging portion 359 is formed to engage with the actuating engagement end 356b of the positioning member 355, and normally the left end of the actuating engaging end 356b is connected to the spring 358 on the bottom surface. When the positioning engagement end 356a is disengaged from the positioning hole 352 of the magazine and the claw release cylinder 82 is disengaged, the engagement portion 35
The upper end of the spring 3 engages with the actuating engagement end 356b.
The positioning member 355 is swung counterclockwise against the force 58, so that the positioning engagement end 356a
The rotor 51 is engaged with the positioning hole 352 of the magazine No. 1 to position the rotating body 51.

In the present application, the guide block may be omitted, and the pawl moving device may be gripped by a rotary arm system such as that used in a tool changing device to replace the pawl. In addition, the claw storage magazine has a holder attached to an endless moving body as used in tool magazines, etc., 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 90 degrees. It may also be something that allows you to do so.

Effects As described above, according to the device of the present invention, the claw removing cylinder that releases the engagement between the slide member of the quick change chuck and the claw is disposed between the chuck and the claw storage magazine, and the claw removing cylinder is disposed between the chuck and the claw storage magazine. A positioning member is provided on the other side to engage and disengage the shaft member with the attached shaft member and the positioning hole of the claw storage magazine, and the positioning member is engaged and disengaged from the positioning hole by the operation of the cylinder. After indexing the magazine, the pawl storage magazine can be accurately positioned when the chuck's pawl is removed, and when the pawl is automatically replaced, the pawl can be replaced extremely smoothly, and a separate actuator is provided for positioning. It is possible to position the claw storage magazine without any trouble.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the first embodiment, and Fig. 2 is a longitudinal cross-sectional view of the first embodiment.
3 is a sectional view taken along the line shown in FIG. 2, FIG. 4 is a sectional view of the magazine positioning device, FIG.
9 to 9 are explanatory diagrams of operating states, FIG. 10 is a cross-sectional view of FIG. 1, FIG. 11 is a sectional view of the main part of the second embodiment, and FIG. It is. 3...Main shaft, 5...Quick change chuck, 12...Slide member, 13...Claw, 43...Shaft member, 50...Claw storage magazine, 82...Claw removal cylinder, 84a...Rear Piston rod, 15
0...Positioning device, 152,252,352...
...Positioning hole, 155, 255, 355...Positioning member.

Claims (1)

[Claims] 1. A chuck that is inserted into the main shaft and has a pawl that engages with and disengages from the sliding member, and a pawl storage magazine that is equipped with a holder that holds a plurality of sets of replacement pawls, and the chuck and the pawl storage magazine are In an automatic chuck pawl changing device that indexes the chuck to a predetermined pawl exchange position and replaces the pawl, the chuck slide member and pawl indexed to the pawl exchange position are attached to a shaft member that rotatably supports a pawl storage magazine. A claw removing cylinder is provided for removing the engagement with the shaft member, a magazine positioning hole is provided on one of the shaft member and the claw storage magazine, and a positioning member that engages and disengages from the positioning hole is provided on the other, and the positioning member is A pawl in an automatic chuck pawl changing device, characterized in that the pawl is mechanically connected to a piston rod of the pawl removal cylinder, and a positioning member is engaged with and disengaged from a positioning hole by operation of the pawl removal cylinder to position a pawl storage magazine. Storage magazine positioning device.