JPH0248367B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This application describes a chuck claw attached to a chuck,
This invention relates to a chuck storage magazine for an automatic chuck chuck exchanger that automatically replaces chuck jaws with a chuck corresponding to the grasping diameter of a workpiece.

Prior Art and its Problems As the automation of machine tools progresses, automatic replacement of pawls attached to chucks has become widespread, and various automatic pawl exchange devices are in use. These automatic changing devices, which come in a variety of different types, have a plurality of pawls held in a pawl storage magazine, and the pawls are alternately transferred from the chuck to the pawl storage magazine and from the pawl storage magazine to the chuck. The process of changing the claws by moving them is basically the same.

As with the structure of the nail changing device, various methods of holding the nails in the nail storage magazine used in conventional devices have been adopted, and one example is shown in FIG. storage magazine 50
The claw 13 is engaged with and held in place as follows. Reference numeral 51 denotes a rotary body having a circular planar shape, which is rotatably fitted to the shaft member 43. On the outer periphery of this rotary body 51, there are provided a number of chucks (for example, three chucks) into which the claws 13 can be pulled out. 5
When replacing a set of claws, 15 holders 53 are provided at equal intervals. This holder 53 has a holding groove 54 into which the sliding portion 13a of the claw 13 is fitted;
It is composed of a retainer 55 that locks and holds the claw 13 fitted in the retainer groove 54.
consists of a locking pin 55a that is buried in the bottom surface of the holding groove 54 so that it can freely protrude and retract, is biased in the projecting direction by a spring 56, and is prevented from coming off by a pin 57. 55a engages with the rack teeth 17 on the rear surface of the claw 13 fitted in the holding groove 54 to lock and hold the claw 13, and the claw 13 can be inserted and removed using the spring 5.
This is done by pushing in the locking pin 55a against the force 6.

The above-described method of holding the claw 13 does not require any special power source and is held by hooking the claw, and is one of the simplest methods conventionally used. Even in the case of this simplest type of locking method, the locking pin 55
a and the pins 57, drilling holes for inserting these pins, etc., and assembling each part for each holder 53. This results in an increase in the number of parts and the increase in processing and assembly time. In addition to this, the above-mentioned tendency is even more significant because two locking pins 55a must be provided in one holder 53 in order to stably lock and hold the claw 13. becomes. Furthermore, since the holder 55 must be installed in an extremely narrow mounting location of the holder 53, it is difficult to minimize the distance between the holders 53 in order to mount the holder 55, which increases the size of the entire device. There are shortcomings that are connected. In addition to the above-mentioned method of holding the claws 13, there is a conventional method in which the claws are directly gripped and held by a gripping device installed in the claw storage magazine, but this method is different from the above-mentioned hook type. This is not preferable because the disadvantage becomes even greater.

Purpose and Summary In view of the above-mentioned drawbacks of the conventional technology, the present application is designed to insert and remove the claws into and out of the claw insertion grooves provided in the claw holder, without providing a special claw holding device like in the conventional claw storage magazine. The claw is held by being received by the claw receiving plate provided at the bottom of the claw holder, and the mechanism is not only simple but also reliable.
The object of the present invention is to provide a nail storage magazine with good operability without the drawbacks of conventional nail storage magazines.

Embodiments Next, the present application will be explained in detail with reference to drawings showing embodiments. However, since the claw storage magazine of the present invention is applicable to various types of automatic chuck claw changing devices, the present application will not be described in the description of the embodiments. A case will be explained in which the present application is applied to Japanese Patent Application No. 183881/1983, which was previously filed by a person.

1 is a well-known machine tool such as an NC lathe, 2 is its machine base, and 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. 5 is a quick change chuck, and this chuck body 6 is integrally attached to the front end of the main shaft 3. As shown in FIG. 2, 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 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, as shown in FIG.
2b is formed. The pawl 13 is formed with a locking portion 14 for changing the pawl. This locking part 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 outer end surface of the pawl 13 in the sliding direction. Note that the locking portion 14 may be configured by providing a projecting piece 16 so as to project forward. Furthermore, a rack tooth 17 is formed on the rear surface of the pawl 13.
7 can be engaged with and disengaged from the slide member 12 by a claw engaging device 18 shown 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 NC device moves the sliding groove 11 of the chuck body 6 to a predetermined pawl replacement position A (the figure shows the case above the center of rotation, but it can also be moved diagonally above or below the center of rotation). It is configured so that it can be determined and stopped. Next, 28 is a guide part in the front-rear direction (horizontal direction in FIG. 2) 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. A longitudinal piston rod 30b of a longitudinally movable cylinder 30 fixed to the base 2 is connected. Further, a stopper bolt 31 is screwed onto 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 13 abuts on a contact portion 33 formed on the machine base 2. The forward end of the table 29 is positioned using the table 29.
On the table 29, the head side end of the cylinder body 34a of the lifting cylinder 34 is attached to a mounting bolt 35.
The piston rod 34b thereof 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/discharge pipe 37 is formed with a supply/discharge hole 40 for supplying and discharging pressure oil to the upper piston chamber through the communication hole 39, and the lid member 36b is formed with a supply/discharge hole 40 for supplying and discharging pressure oil to the lower piston chamber. A supply/discharge hole 41 is formed. A display shaft 42 having a dog 42a is implanted on the upper end surface of the tube member 36a, and this display shaft 42 projects through an elevator frame to be described later.
Further, a shaft member 43 is provided on the outer periphery of the tube member 36a.
The sliding hole 44 formed in the shaft portion 43a of the key 45
The piston rod 34b is fitted so as to be slidable up and down while being prevented from rotating, and the tip of the piston rod 34b is connected to the upper end of the shaft portion 43a of the shaft member 43. 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. This support frame 46 has a limit switch 4 located above the shaft member 43.
8,49 is attached to the husband. 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 rod 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, 200 is a claw storage magazine according to the present invention which stores a large number of replacement claws 13 for replacing the claws 13 of the quick change chuck 5. 201 is a claw holder with a circular planar shape.
It is rotatably fitted to the shaft portion 43a of the shaft member 43, and its rotational axis is set to be parallel to the sliding direction of the sliding groove 11 at the pawl exchange position A of the quick change chuck. ing. A replacement pawl 13 is provided on the outer periphery of the pawl holder 201 to replace the pawl 13 fitted in the sliding groove 11.
A large number of insertion grooves 202 into which the sliding portions 13a are inserted and removed are provided at equal pitches.
The claw 13 inserted into the slot 202 is slidable vertically in the drawing, and the insertion groove 202 does not have any locking means for restricting the sliding of the claw 13. Reference numeral 203 denotes a plate-shaped claw receiving plate, which is constructed as follows and is attached as follows. 205 is a claw receiving plate 203
A horizontal receiving surface 20 which is a receiving plate that stands up from the bottom plate 204 and whose upper edge is connected except for a passageway 208 which will be described later.
6, the bottom plate 204 is provided with an eccentric punched hole 207 as shown in FIG. The claw removing cylinder 82 and the like, which will be described in detail in , are located within this punched hole 207 to prevent the installation from becoming a hindrance and from interfering with each component. In this example, the punched hole 207 is eccentric, but this is due to the configuration of the automatic chuck pawl changing device shown in this example, and the eccentricity itself has no particular significance. I would like to add this. Next 208
is a passage for the pawl 13, which is provided by cutting out a part of the receiving plate 205 and the bottom plate 204.
3 moves up and down through the passage 208. Note that in this embodiment, the passage passage 208 is provided at the part where the punched hole 207 is closest to the receiving plate 205, but this is also located at that part due to the structure of this embodiment, as described above. The position of the notch does not determine the essence of the invention. In the pawl receiving plate 203 configured as described above, the receiving plate 205 faces the insertion groove 202 at an appropriate interval below the pawl holder 201, and the passage path 208 is divided into a predetermined pawl exchange position A. The chuck body 6 is fixed to the lower end of the shaft member 43 by an appropriate means such as the mounting plate 209 so as to be located directly above the sliding groove 11 of the chuck body 6. Therefore, the claw receiving plate 203 is connected to the lifting frame 47 and the claw holder 2.
01, but the claw holder 201
does not rotate even if it rotates as described later, and the vertical positional relationship between the pawl holder 201 and the pawl receiving plate 203, and the planar positional relationship between the indexed sliding groove 11 and the passageway 208. The claw holder 201 and the claw receiving plate 203 constitute the claw storage magazine 200 of the present application, and the lower end surface of the claw 13 inserted into the insertion groove 202 is fixed to the receiving plate 205. The claws 13 are prevented from falling by contacting the surface 206, and are held by the insertion grooves 202 and the claw receiving plate 205 and stored in the claw storage magazine 200. In the above embodiment, the pawl receiving plate 203 is shown as a dish-shaped plate having a bottom plate 204, but the present invention is not limited to this, and the pawl receiving plate 203 may be a long and thin plate that is curved into a circular shape so as to form a passage portion 208. Achieve a purpose even with something.

A gear 58 is formed on the claw holder 201, and a drive gear 60 is attached to the rotation shaft 59a of a motor 59 fixed to the support frame 46.
are engaged. Further, a plurality of sets of dogs 61 and 62 are fixed to the lower side of the claw holder 201 in correspondence with the respective insertion grooves 202, and a deceleration limit switch 63 detects one dog 61 and a deceleration limit switch 63 detects the other dog 62. A set of stop limit switches 64 are 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 a reduced rotation, and when the limit switch 64 detects the dog 62, it stops the rotation of the motor 59, thereby moving the insertion groove 202 of the claw holder 201 so that the table 29 is at the forward end. In the state in which the elevating frame 47 is positioned at the lower end (hereinafter referred to as the replacement preparation state), the elevating frame 47 is indexed and stopped at a predetermined pawl exchange position B located on the extension line of the sliding groove 11 of the pawl exchange position A. A passage 208 for the pawl receiving plate 203 is located below the insertion groove 202 indexed to the pawl exchange position B. When the claw holder 201 rotates as described above, the claw 13 inserted into the insertion groove 202 moves while slidingly contacting the receiving surface 206 of the claw receiving plate 205.

Next, 65 is the insertion groove 20 of the claw holder 201 from the sliding groove 11 of the claw replacement position A to the claw replacement position B.
2 or from the insertion groove 202 to the sliding groove 11 through passageways 208, and is composed of a guide block 66 and a pawl moving device 67 shown below in the drawing. The guide block 66 is fixed to the lower end of the shaft member 43. This guide block 66 has
In the replacement preparation state, these sliding grooves 11 and insertion grooves 202 are located below the pawl receiving plate 203 between the sliding groove 11 at the pawl exchange position A and the insertion groove 202 at the pawl exchange position B. A guide groove 68 is formed that is substantially continuous in a straight line. This guide groove 68 is similar to the sliding groove 11 and the holding groove 54.
It is formed in a cross-sectional shape that can guide the sliding portion 13a of No. 3, and the upper and lower end portions are formed to be slightly wider toward each other so as to easily guide the claw 13 into the guide groove 68. Next, in the claw moving device 67, 69 is a moving cylinder fixed to the support frame 46,
The piston rod 70 is positioned above the insertion groove 202 at the pawl exchange position B so as to protrude downward. A movable body 71 is fixed to the tip of the piston rod 70, and a locking piece 74 and an operating piece 75 are formed in two guide grooves 72 and 73 in the front and rear directions formed in the movable body 71 as shown in FIG. They are fitted together so that they can move 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 operating piece 75 and the movable body 71, so that the stop portion 74b of the locking piece 74 is pressed against the movable body 71.
Normally, the operating portion 75a of the operating piece 75 moves rearward, and the locking piece 7
No. 4 engaging portions 74a protrude forward. When the piston rod 70 of the moving cylinder 69 is moved to the lowest end as shown in FIG. 14 and the end face of the claw, and when the piston rod 70 is moved to the uppermost end, it is positioned so as to fit between the overhanging piece 14 of the claw 13 at the claw replacement position B and the end face of the claw. There is. Further, the operating portion 75a of the operating piece 75 is connected to the passage grooves 78 and 79 formed at the bottom of the insertion groove 202 and the guide groove 68, and the pawl receiving plate 2.
03 through passageway 208. Passage groove 79 of this guide block 66
An operation guide piece 80 that is held movably in the front-back direction by a guide block 66 is disposed inside. This operation guide piece 80 is adapted to be moved back and forth by a claw release cylinder which will be described later. This operation guide piece 80 is connected to the claw moving cylinder 6.
When the piston rod 70 of No. 9 is lowered, it is moved to the forward end, and at this position, it engages with the operating portion 75a of the operating piece 75 and moves this operating piece 75 forward against the spring 77, thereby causing the engagement. The engaging portion 74a of the stopper piece 74 is connected to the overhanging piece 14 of the pawl 13 at the pawl exchange position A.
Furthermore, when the piston rod 70 is located at the lowering end, it is moved to the backward end, thereby releasing the forward guidance of the operating piece 75 and opening the engaging portion of the locking piece 74. 74a can be inserted from the rear side between the protruding piece 14 of the claw 13 at the claw exchange position A and the end face of the claw. A stopper shaft 100 is screwed onto the movable body 71, and the stopper shaft 100 is connected to a hole formed in the flange portion 69a of the movable cylinder 69.
It is penetrated into 01. This stopper shaft 100
Nuts 102 and 103 for positioning the lower and upper ends of the piston rod 70 are screwed into the piston rods, 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.
It is constructed by connecting. 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 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 so that the lock teeth 21 of the meshing member 19 are aligned with the rack teeth 1 of the pawl 13.
7 to a rear position where it does not engage. Further, as shown in FIG. 4, a positioning pin 87 for positioning the quick change chuck 5 at the pawl exchange 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 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. is fitted to position the quick change chuck 5 at a predetermined index position. Also,
The mounting piece 85 has a display rod 8 as shown in FIG.
8 is fixed to the display rod 88, and the upper and lower ends of the piston rod 84 can be detected by operating a limit switch (not shown) fixed to the guide block 66 using dogs 89 and 90 fixed to the display rod 88. It's summery. 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, 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, the operation of the claw storage magazine 200 of the present invention when replacing the claws in the machine tool 1 having the above configuration 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. 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 lifting frame 47 are accurately positioned by the action of the stopper bolt 31 and the mounting shaft 49b, so that one of the insertion grooves 202 of the claw holder 201 is positioned at the claw replacement position B. The passing path 208 of the pawl receiving plate 203
The guide groove 68 of the guide block 66 is precisely arranged between the sliding groove 11 of the pawl 13 at the pawl exchange position A and the insertion groove 202 of the pawl holder 201 at the pawl exchange position B so as to be substantially continuous with these in a straight line. It is located and ready for exchange. In addition, the nail storage magazine 200
The pawl holder 201 is indexed and rotated in advance by the motor 59, and the empty insertion groove 202 for storing the pawl 13 at the pawl exchange position A is indexed to the pawl exchange position B. The receiving plate 203 moves up and down together with the claw holder 201 but does not rotate, so the insertion groove 202 and the sliding groove 1 are always indexed.
It is located between 1 and 1. The above nail storage magazine 20
The empty insertion groove 202 at 0 may be indexed after the longitudinal movement cylinder 30 and the elevating cylinder 34 are operated. Next, the moving cylinder 69 of the pawl moving device 67 operates to move the movable body 71 through the passage groove 78 of the insertion groove 202 and the pawl receiving plate 20.
It is lowered through the passageway 208 of No. 3. in this case,
The piston 82b of the claw removing cylinder 82 of the claw removing device 81 is maintained at the rising end, and the guide block 66
The operation guide piece 8 disposed in the passage groove 79 of
0 protrudes 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 is moved forward, thereby moving the locking piece 74 backward. Interference between the engaging portion 74a and the overhanging piece 16 of the pawl 13 at the pawl exchange position A is prevented, and when the movable body 71 is positioned at the lower end, the engaging portion 74a is placed at the pawl exchange position A.
It is located at the rear between the end surface of the claw and the overhang piece 16. Next, the claw removing cylinder 82 of the claw removing device 81 is operated 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, and the engaging member 19 is moved into position. 5, the lock teeth 21 of this meshing member 19 are
and disengages the pawl 13 from the lock tooth 17.
In addition, as mentioned above, the rack teeth 21 and the rack teeth 17
Even if the set pin 23 is disengaged from the spring 24
Since the claw 13 is engaged with the rack teeth 17 of the claw 13 by force, the claw 13 at the claw replacement position A is prevented from falling out of the sliding groove 11. Also, the above mounting piece 8
5, the positioning pin 87 is fitted into the positioning hole 12b of the sliding member 12 as shown in FIG. 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, 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 74a is fitted between the claw end surface of the claw 13 at the claw replacement position A and the overhanging piece 16, and the claw 13 is moved forward.
to lock. Next, the moving cylinder 69 operates to raise the moving body 71, thereby causing the locking piece 7
The engaging portion 74a of No. 4 hooks the projecting piece 16 of the pawl 13 at the pawl exchange position A to raise the pawl 13. Therefore, as shown in FIG. 8, 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 inserted into the insertion groove 202 at the pawl exchange position B through the passage path 208. Since it is locked by the engaging portion 74a of the locking piece 74 while inserted into the insertion groove 202, it will not fall out of the passageway 208. Next, the motor 59 is activated to remove the claw storage magazine 200.
The claw holder 201 is indexed and rotated, and the empty insertion groove 202 for storing the next claw 13 of the quick change chuck 5 is indexed to the claw replacement position B.
When the indexing operation is performed in this way, the engagement between the claw 13 inserted into the insertion groove 202 and the engaging portion 74a is gradually disengaged by the rotation of the claw holder 201, but before the claw 13 is completely disengaged. The lower end surface of the claw 13 comes into contact with the receiving surface 206 of the claw receiving plate 205, and when the indexing operation is completed, the lower end surface of the claw 13 crosses halfway and comes into contact with the receiving surface 206, so that the insertion is performed. Since the claw 13 is held by the groove 202 and the claw receiving plate 203, there is no risk of the claw 13 falling due to rotation of the claw holder 201, and the claw receiving plate 203
Thereafter, the claw 13 that has been delivered to the insertion groove 202 moves while slidingly contacting the receiving surface 206. Further, the claw release cylinder 81 operates to raise the mounting piece 85, whereby the pressing pin 86 releases the pressing of the operating pin 20, and the positioning pin 87 is removed from the positioning hole 12b. When the pressing pin 86 releases the pressing of the operating pin 20 as described above, the engaging member 19 of the pawl engaging device 18 engages the biasing spring 2
2, the operating pin 20 is moved back toward the outer circumference of the chuck. In this case, the proximity switch 95 of the engagement confirmation device 94 detects the presence of the operating pin 20 and confirms whether the operating pin 20 has been completely returned to its original position.
Based on this confirmation signal, the quick change chuck 5 is indexed and rotated again to move the slide groove 1 of the next pawl 13.
1 to the claw replacement position A. After that, repeat the above operation to adjust the three claws 1 of the quick change chuck 5.
3 is held in the nail storage magazine 200. As described above, insert the third claw 13 into the claw storage magazine 20.
0, the claw release 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 again to remove it for the first time. The sliding groove 11 of the claw 13 is again indexed to the claw replacement position A. In addition, the motor 59 is connected to the claw storage magazine 200.
The claw holder 201 is rotated to index the insertion groove 202 into which the claw 13 to be fitted into the sliding groove 11 of the claw exchange position A is inserted to the claw exchange position B. Overhang piece 1 of claw 13 inserted into insertion groove 202 by rotation
6 and the claw end surface, the claw 13 is transferred from the claw receiving plate 203 to the engaging portion 74a of the claw moving device 67, contrary to the above. This is done, and the claw 13 is prevented from falling as before. Next, the claw release cylinder 82 is operated to lower the mounting piece 85, thereby causing the press pin 8
6 pushes the operation pin 20 again to move the engaging member 19 backward, and the positioning pin 87 is inserted into the positioning hole 12b.
The guide block 66 and the chuck body 6 are fitted into each other to determine the relative position of the chuck body 6. Next, the moving cylinder 69 is operated to lower the movable body 71, whereby the claw 13 held in the insertion groove 202 at the claw replacement position B is moved by the locking piece 74 into the insertion groove 202.
After being pushed out, it is guided through the passageway 208 to the guide groove 68 and fitted into the sliding groove 11 at the pawl exchange position A, and is engaged by the set pin 23 while being fitted in the sliding groove 11. It is held still. Further, when the movable body 71 is lowered as described above, the claw removing cylinder 82 lowers the mounting piece 85 and moves the operation guide piece 80 backward, so that the operation part 75a of the operation piece 75 is moved to the operation guide piece. The locking portion 74a of the locking piece 74 is not pushed forward by the locking member 80.
will not come off from the locking portion 14 of the claw 13.

Next, the claw removing cylinder 82 is operated to remove the mounting piece 8.
5 is raised, thereby the pressing pin 86 releases the pressing of the operating 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 own rack teeth 21 are engaged with the rack teeth 17 of the pawl 13 at the pawl exchange position A, and the operation is resumed. The 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. Due to some reason, the above-mentioned rack teeth 21 and 17
If the engagement of the lock teeth 21 and 17 is uncertain, the return movement of the operating pin 20 will be incomplete, and the operating pin 20 will not be detected by the proximity switch 95, and the engagement of the lock teeth 21 and 17 will be incomplete. Report what is certain. When the mounting piece 85 is raised by the claw release cylinder 82 as described above, the operation guide piece 80 is moved forward and the engaging portion 74a of the locking piece 74 is moved to the claw 1.
3 from the locking part 14. Next, the moving cylinder 6
9 operates 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 replacement position A, and the motor 59 rotates the pawl holder 201 to the pawl replacement position. A sliding groove 11
Insertion groove 202 holding claw 13 to be fitted into
is indexed to the pawl replacement position B, and thereafter the pawls are replaced in the same manner as above. In this way, the third nail 1
3 is inserted into the sliding groove 11, and after the movable body 71 and the mounting piece 85 are raised, the motor 59 rotates the claw holder 201 to insert the empty insertion groove at the position where the claw 13 was first extracted. 202 is indexed to the pawl replacement position B to prepare for the next pawl 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 the changing device 65 to the quick change chuck 5.
The nail is moved to a non-replacement position away from the nail, and the series of nail replacement operations is completed.

Other embodiments Next, the claw receiving plate 201 of the claw storage magazine 200 of the present application
Another example will be described. This embodiment is based on the front view shown in FIG. 9 and the receiving plate 2 shown in FIG.
As is clear from the development view of 05, the passageway 208
The sloped portions 206a, 206 are sloped so that both side portions thereof are lowest and gradually become higher as they go inward.
b is provided on the receiving surface 206. Therefore, when replacing the claw using the claw receiving plate 203 of this embodiment, the claw 1 inserted into the insertion groove 202 of the claw holder 201 and held in contact with the receiving surface 206
3, as the claw holder 201 rotates, the receiving surface 20
6 and reaches the inclined part 206a, the claw 13 inserted into the insertion groove 202 gradually descends due to its own weight along the slope, and the claw 13 slides on the passing part 206a.
When it is delivered to the engaging portion 74a of the locking piece 74 in 08, it can be lowered by l as shown in FIG. becomes possible,
This type of automatic machine has an extremely limited installation space, and has the advantage of being able to be made smaller by reducing the overall height of the machine. In addition, the claw 1 pulled out from the quick change chuck 5 at the claw replacement position B
3 from the engaging portion 74a to the claw receiving plate 203 is the same as in the first embodiment, but in this embodiment, the delivered claw 13 is moved by the inclined portion 206b of the receiving surface 206. It is clear from the drawing that it is gradually pushed up.

Effects As detailed above, the claw storage magazine of the present application is capable of absorbing the dead weight of the claws inserted into the insertion grooves of the claw holder, which are provided parallel to the rotational indexing axis in the vertical direction (including the diagonal vertical direction) with respect to the machine base. Since the claws are held in the magazine by catching the drop from below using the claw receiving plate, the structure is simple and does not require a locking device or a gripping device for the claws unlike conventional claw storage magazines. This not only reduces manufacturing costs by reducing the number of processing steps, but also improves productivity by preventing operational errors and mechanical troubles, and also makes the entire device smaller and lighter. This invention has many advantages, such as the ability to

[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 showing the replacement preparation state of FIG. 1, and FIG. 3 is a cross-sectional view with a part omitted. A plan view, FIG. 4 is an enlarged sectional view taken along the - line in FIG. 2, FIG. 5 is a sectional view taken along the - line in FIG. 2, FIG. 6 is a partial view of FIG. FIG. 4 is a sectional view showing the operating state, FIG. 8 is a sectional view showing the operating state of FIG. 1, FIG. 9 is a front view showing another embodiment of the claw receiving plate, and FIG. FIG. 11, which is a developed view of the claw receiving plate, is a partial sectional view of a conventional embodiment. 200... Nail storage magazine, 201... Nail holder, 202... Insertion groove, 205... Receiving plate, 20
6... Receiving surface, 208... Passing path.

Claims (1)

[Scope of Claims] 1. An automatic chuck pawl exchange device that automatically replaces chuck pawls, which is rotatably supported by a shaft member extending vertically with respect to the machine base, and has a plurality of insertion grooves for replacement pawls on the outer periphery. a claw holder that is carved parallel to the axis of the shaft member and sequentially indexes the insertion groove to a predetermined claw replacement position; A claw storage magazine for an automatic chuck claw exchange device, comprising a claw receiving plate having a continuous receiving surface that supports the lower end surface of a claw inserted into an insertion groove. 2. The chuck pawl automatic changing device according to claim 1, wherein the pawl receiving plate has an inclined receiving surface such that the portions at both ends facing the pawl changing position are the lowest and the other portions are successively higher. Nail storage magazine.