JPS60249513A - Exchange device of chuck pawl - Google Patents

Abstract

PURPOSE:To enable a device, equipped on a machine frame in a machine tool, to be formed in a small size, by constituting the device such that the transfer of a pawl between the holder of a pawl storage magazine and the pawl guide groove of a pawl guide structure is performed by a robot set in the periphery of the machine tool. CONSTITUTION:In the case of a chuck pawl exchange device in a machine tool, a pawl moving device 48 linearly moves a pawl between a groove 9 and a groove 44 by positioning on a straight line the pawl mounting groove 9 in a pawl exchange position A of a chuck 4 and the pawl guide groove 44 in a pawl guide structure 43, while a robot 71 holds the pawl to be moved between the groove 44 and a holder 7 in a pawl storage magazine. Accordingly, the pawl of the chuck 4, if it is desired to be replaced with an exchanging pawl, can be mechanically and automatically replaced with the exchanging pawl by previously holding said exchanging pawl in the holder 70. In this way, the device equipped in a machine frame 2 can be formed in a small size.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) Industrial Field of Use The present invention relates to a chuck jaw changing device for automatically exchanging the jaws of a chuck of a machine tool with replacement jaws.

2. Description of the Related Art In a conventional chuck jaw changing device of this type, a jaw storage magazine is rotatably disposed on the machine frame of a machine tool, and replacement jaws stored in this jaw storage magazine are inserted into the jaws. The claws are replaced by indexing them to the replacement position and fitting the indexed claws into the mounting grooves of the chuck.

Problems to be Solved by the Invention In the conventional chuck jaw changing device, when trying to increase the number of jaws that can be stored in the jaw storage magazine, the outer diameter of the jaw storage magazine becomes large, making it difficult to install it on the machine frame of the machine tool. There is a problem in that the number of types of nails that can be replaced is limited to a small number, and the present invention aims to solve this problem.

(Structure of the Invention) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a device main body in a machine tool frame in which the chuck's jaw mounting groove can be indexed to the jaw replacement position. In order to be able to move back and forth, the main body of the device is provided with a pawl guide having a pawl guide groove located in the same straight line as the pawl mounting groove at the chuck's pawl exchange position at the forward end position, and a pawl guide body that has a pawl guide groove located on the same line as the pawl mounting groove at the chuck's pawl exchange position. comprising a claw moving device capable of moving the claw linearly between the claw mounting groove;
On the other hand, a claw storage magazine having a large number of holders capable of detachably holding replacement claws is installed around the machine tool, and the holder of the claw storage magazine and the claw guide groove of the claw guide body are connected to each other. It is characterized by the installation of a robot that can grasp and move its claws between the two.

Function The function of the present invention is to linearly move the jaws of the chuck indexed to the jaw exchange position to the jaw guide groove portion of the jaw guide body by the jaw moving device, and move the jaws by the robot to move the jaws to the holder of the jaw storage magazine. Attach it to.

In addition, the jaws of the jaw storage magazine are moved by a robot to fit into the jaw guide groove of the jaw guide body, and the jaws of this jaw guide groove are moved by the jaw moving device into the jaw mounting groove of the chuck, and the jaws of the chuck are replaced. It is to replace the nails with those used for.

In the drawings of the embodiment, 1 is an NC lathe illustrated as a machine tool;
2 is the machine frame, 3 is a main shaft, and a chuck 4 is attached to this main shaft 3. In this chuck 4, reference numeral 5 denotes a chuck body fixed to the main shaft 3, which is formed hollow as shown in FIG.

A wedge piece 6 is fitted into the center of the chuck body 5 so as to be slidable in the direction of the rotation axis, and this wedge piece 6 is a drawer that is moved back and forth by a rotating cylinder (not shown) fixed to the main shaft 3. It is connected to member 8. Furthermore, three radial pawl mounting grooves 9 are formed on the front surface of the chuck body 5, and pawl actuating bodies 10 are fitted into the rear portions of these pawl mounting grooves 9 so as to be slidable in the radial direction. , and the claw mounting groove 9
A claw 11 can be fitted into the front part of the handle.

As is well known, a wedge portion having a T-shaped cross section is formed at the center end of the pawl actuating body 10, and this wedge portion is fitted into a wedge groove having a T-shaped cross section formed on the outer periphery of the wedge piece 6. By moving the wedge piece 6 back and forth, the pawl actuating body 10 is moved in the radial direction.

Further, as shown in FIG. 5, positioning holes 12 for positioning the chuck in the rotating direction of the chuck are formed in the outer peripheral end surface of the pawl actuating body 10. Further, the pawl actuating body 1o is provided with a disengaging means 13 for engaging and disengaging the pawl actuating body 10 and the pawl 11. This engaging/disengaging means 13 includes an engaging element 15 which is fitted into a hole 14 in the longitudinal direction of the pawl actuating body 10 so as to be slidable in the longitudinal direction.
and an operation pin 17 slidably fitted into a radial hole 16 crossing the hole 14, and the engaging element 15
The operating pin 17 is engaged with an oblique groove formed on one side and an oblique protrusion formed on the other side (both not shown), and when the operating pin 17 is moved toward the center, the engaging element 15 retreats. When the engaging member 15 is moved and the operating pin 17 is moved in the outer circumferential direction, the engaging member 15 moves forward. The above engaging element 15
is urged forward by the spring 18, so that the engaging teeth 15a formed on the front surface of the engaging element 15 are engaged with the engaging teeth 11a formed on the back surface of the pawl 11.

A set pin 19 is provided on the engagement element 15 so as to be slidable in the front-back direction. The tip is engaged with the engagement tooth 11a of the claw 11.

An engagement groove 22 as an engagement part is provided on the rear surface of the end of the claw 11.
is formed. The chuck 4 uses an NG device (not shown) or a separately attached indexing device to move the pawl mounting groove 9 to a predetermined pawl replacement position A (the figure shows a case above the center of rotation, but diagonally above the center of rotation). , lateral direction, etc.) and can be stopped at any position. 23 is a cover surrounding the NC lathe 1, and 25 is an opening provided in the cover 23, which is opened and closed by an opening/closing door (not shown). During this time, the closed door is automatically opened when a workpiece to be gripped by the chuck 4 is taken in or taken out or when the jaws are replaced as will be described later.

Next, a guide part 2a in the longitudinal direction is formed on the machine frame 2, and a board 27 of the apparatus main body 26 is fitted onto this guide part 2a so as to be slidable in the longitudinal direction.

A stopper bolt 28 is fixed to the rear end of the base plate 27, and the stopper bolt 28 comes into contact with a contact portion of the machine frame 2, so that the forward end is positioned. Further, a piston rod 29a of a longitudinally movable cylinder 29 attached to the machine frame 2 is connected to the side surface of the front end of this base plate 27 as shown in FIG. It is designed to be moved back and forth between the rear standby position shown by and the front operating position shown by a solid line.

An elevating guide 30 is integrally provided on the upper surface of the front end of the board 27, and an elevating guide groove 3 is provided on the front surface of the elevating guide 30.
0a is formed. An elevating body 31 is fitted into the elevating guide groove 30a so as to be movable up and down. A piston rod 32a of an elevating cylinder 32 mounted on the elevating guide body 30 is connected to the upper end of this elevating body 31, and when the elevating cylinder 32 is operated, the elevating position shown by the imaginary line in FIG. It is designed to be raised and lowered to a lowered position. Note that the elevating body 31 may be integrally attached to the base plate 27 by lowering the height of the guide portion 2a of the machine frame 2. The elevating body 31, the elevating guide body 30, and the substrate 27 constitute a device main body 26.

Next, a guide block 33 is fixed to the front surface of the upper end of the elevating body 31, so that when the elevating body 31 is moved to the operating position shown by the solid line in FIG. It has become.

As shown in FIG. 4, this guide block 33 has a guide groove 34 formed on an extension line that is aligned with the pawl mounting groove 9 indexed at the pawl exchange position A of the chuck 4.

The guide groove 34 is formed to have a cross-sectional shape corresponding to the sliding part of the claw 11 so as to be able to guide the sliding part of the claw 11, and has a lower end so that the claw 11 can easily fit into the guide groove 34. Slightly chamfered. As shown in FIGS. 4 and 5, the guide block 33 is provided with a claw release device 35 for disengaging the engagement teeth 15a of the engager 15 of the chuck 41 and the engagement teeth 11a of the claw 11. ing. In this claw removing device 35, numeral 36 is a claw removing cylinder, and a piston 3 is inserted into a piston chamber 37 formed inside the guide block 33.
8 and a downward piston rod 39 is connected to this piston 38. The piston rod 39 is directed toward the center of rotation of the chuck 4, and has a movable piece 40 fixed to its lower end.

A chuck 4 is provided on the lower surface of this movable piece 40 in the operating position.
A pressing pin 41 is fixed at a position facing the end surface of the operating pin 17 at the claw exchange position A in , and the pressing pin 41 pushes the operating pin 17 due to the protrusion of the piston rod 39 to disengage the engagement between the engager 15 and the claw 11. It has become. The claw removing cylinder 36 also serves as a positioning cylinder for positioning the relative position between the index position of the chuck 4 and the guide block 33, and a positioning cylinder on the lower surface of the movable piece 40 is positioned opposite to the positioning hole 12 of the chuck 4. A pin 42 is fixed. This positioning pin 42 is fitted into the positioning hole 12 by the protrusion of the piston rod 39.

Next, a pawl guide body 43 is integrally fixed to the front middle portion of the elevating body 31 and is located above the guide block 33 . A pawl guide groove 44 is formed in this pawl guide 43 and is positioned on the same straight line as the pawl mounting groove 9 at the pawl exchange position A in the chuck 4 when the device main body 26 is moved to the forward end operating position. There is. This pawl guide groove 44 is the eighth
As shown in the figure, the sliding portion of the claw 11 is formed in a cross-sectional shape that can be inserted and removed from the front, and notched holes 45 are formed on both sides of the claw 11, as shown in FIG. This notch hole 45
A notch 46 having a conically pointed tip is fitted into the notch 46, and the notch 46 is urged toward the projecting side by a spring 47 to prevent it from coming off. As shown in FIG. 8, when the sliding portion of the pawl 11 is fitted into the pawl guide groove 44, these notches 46 come into contact with the front end corners of the sliding portion and move the sliding portion into the pawl guide groove 44.
This allows the claw 11 to align with the bottom surface 44a of the claw guide groove 4.
It is designed to be positioned at a predetermined position using four parts.

Next, at the upper end of the elevating body 31, there is a protrusion 3 that protrudes forward.
1a, and this overhang 31. A is provided with a pawl moving device 48 for directly moving the pawl 11 between the pawl guide groove 44 of the pawl guide 43 in the operating position and the pawl mounting groove 9 of the pawl exchange position A of the chuck 4. . In this pawl moving device 48, 49 is a pawl moving cylinder fixed on the overhanging portion 31a, and the piston rod 50 is connected to the overhanging portion 31a.
It projects downward through the hole 51 of 1a. A moving body 52 is fixed to the tip of the piston rod 50. As shown in FIGS. 6 and 7, guide grooves 53 and 54 in the front and rear directions are formed in this movable body 52.
At 3.54, a locking piece 55 and an operating piece 56 are fitted so as to be movable back and forth.

These locking pieces 55 and operating pieces 56 have intermediate parts that are connected to the movable body 5.
They are pin-connected by a link 57 pivotally connected to 2. The operating piece 56 is biased rearward by the spring 58 so that the operating portion 56a is projected rearward, and at the same time, the locking piece 55 is positioned at this position with the locking portion 55a projected forward as shown in FIG. Fixed. Locking portion 5 of the locking piece 55
5a is the engagement groove 22 of the pawl 11 as shown by the imaginary line in FIG.
When the piston rod 50 is lowered to the lowest position, it moves to a position where it engages with the engagement groove 22 of the pawl 11 installed in the pawl installation groove 9 of the chuck 4, as shown in FIG. It is now possible to do so. Also, the operation section 56 of the operation piece 56
a is raised and lowered through passage grooves 58 and 59 formed at the bottom of the pawl guide groove 44 and the guide groove 34, and is operated back and forth by an operation guide piece 60 disposed in the passage groove 59. . As shown in FIG. 4, this operation guide piece 60 is provided at the front end of a sliding body 61 that is supported by the guide block 33 so as to be movable back and forth. The portion 62 is fitted into an inclined groove 63 formed in the movable piece 40 and having a T-shaped cross section. The operation guide piece 60 is retracted as shown in FIG. 9 by the lowering of the piston rod 39 of the claw release cylinder 36, and moved forward as shown in FIG. 4 by the raising of the piston rod 39. Further, the upper end of the front surface of the operation guide piece 60 is formed into a slope so that the operation portion 56a can be guided forward. In addition,
The upper and lower moving ends of the movable body 52 are positioned by nuts 65 and 66 screwed onto the stopper shaft 64, and the movable body 52 is accurately positioned at the rising end shown in FIG. 4 and the falling end shown in FIG. It is about to be moved.

Next, a nail storage magazine 67 for storing replacement pawls 11 is fixedly installed around the installation position of the NC lathe 1. In the nail storage magazine 67, 68 is formed in a stepped shape. A claw holder 69 is fixed to each crotch surface of the magazine body. This claw holder 69 has claw fitting grooves 7, which are illustrated as a large number of holders at predetermined pitch intervals.
0 is formed. These pawl fitting grooves 70 are formed so that the sliding part of the pawl 11 attached to the chuck 4 can be freely inserted and removed in the vertical direction, and the replacement pawl 11 can be inserted into these pawl fitting grooves 70. The sliding parts are fitted as shown in FIG. In this case, the claws 11 held by each claw holder 69
The front and rear spacing of each claw holder 69 is made large so that the claws do not interfere with each other, and a part of the upper claw 11 is positioned behind the lower claw 11. Note that the above-mentioned holder may be composed of a pair of gripping arms or the like.

Next, around the installation position of the NC lathe 1, the pawl 11 can be held and moved between the pawl fitting groove 70 of the pawl storage magazine 67 and the pawl guide groove 44 of the pawl guide body 43. A robot 71 is installed. This robot 7
1, 72 is a guide rail, and the claw storage magazine 67
The chuck 4 is disposed parallel to the front surface of the chuck 4 and perpendicular to the rotational axis of the chuck 4 . A support base 73 is fitted onto the guide rail 72 so as to be slidable in the longitudinal direction, and is slid by a moving motor 74.

A support column 75 rising upward is rotatably attached to the support base 73, and is configured to be rotated by a predetermined angle by a rotation motor 76. An elevating body 77 is attached to the support column 75 so that it can be raised and lowered by itself and cannot be rotated relative to each other. This elevating body 77 is configured to be raised and lowered by an elevating motor 78. A horizontal support arm 79 is attached to the elevating body 77 so as to be slidable in the longitudinal direction without rotation. This support arm 79 is connected to a telescopic motor 80.
It is configured to be slid in the longitudinal direction by.

A wrist body 81 is attached to the distal end of the support arm 79 so as to be pivotable about an axis in the vertical direction. This wrist body 81 is configured to be rotated by 90 degrees by a rotation motor 82. The bases of a pair of left and right gripping fingers 83, 83 are rotatably attached to the wrist body 81.

These gripping fingers 83,83 are configured to be rotated in opposite directions by a gripping motor 84, so that they can grip the claw 11 between them and release the claw 11. . Further, the wrist body 81 has a mold pressing member 8.
5 is attached, and by pressing this mold pressing member 85 against the claw 11, the relative positions of the gripping fingers 83, 83 and the claw 11 can be determined. Note that the robot 71 may be of any type as long as it can move the claw 11 from the heavy electric coupling groove 70 of the claw storage magazine 67 to the claw guide groove 44 of the claw guide body 43, or vice versa, and is not limited to its specific configuration. Since the robot 71 is not a detailed description of the robot 71, a detailed explanation of the robot 71 will be omitted here. The operation of the robot 71 is controlled by a computer.

Next, a case will be described in which the jaws 11 stored in the jaw storage magazine 67 are attached to the chuck 4 having the above structure. First, the main shaft 3 is indexed and rotated so that one of the pawl mounting grooves 9 of the chuck 4 is located at the pawl exchange position A, and then stopped. At this position, the wedge piece 6 is moved forward and the three of the chuck 4 are rotated.
The two pawl actuating bodies 10 are moved to the outermost open position. On the other hand, the piston rod 29a of the longitudinally movable cylinder 29 moves to move the main body 26 from the rear standby position shown by the phantom line in FIG. 2 to the front operating position shown by the solid line in FIG. Next, the piston rod 3 of the lifting cylinder 32
2a is retracted and the elevating body 31 is lowered as shown by the solid line in FIG. In this state, the guide groove 34 of the guide block 33 and the pawl guide groove 44 of the pawl guide body 43 are located approximately on a straight line with the pawl mounting groove 9 at the pawl exchange position A. The door will also be opened. Next, robot 7
1 operates to move the gripping fingers 83, 83 to the outside of the surface of the claw 11 fitted in the predetermined heavy electric coupling groove 70 of the claw storage magazine 67 as shown in the imaginary line in FIG. 1 and in FIG. At the same time, the mold pressing member 85 is brought into contact with the front surface of the claw 11. This movement of the grip fingers 83, 83, for example, rotates the wrist body 81 so that it is in line with the support arm 79, and
9 to the rear, and in this state, rotate the support column 75 and raise and lower the elevating body 77 so that the gripping fingers 83 and 83 face the front of the claws 11 of the claw storage magazine 67 to be grasped,
This can be done by moving the rear support arm 79 forward. Next, the gripping fingers 83, 83 are rotated inward by the operation of the gripping motor 84, and these gripping fingers 83, 83 are rotated inwardly.
3. Hold the claw 11 between 83 and then lift the motor 7
8, the elevating body 77 is raised to the height shown in FIG.
Hold it at the height position corresponding to 4.

Next, the support 75 is rotated approximately 120 degrees clockwise in FIG. 1 by the operation of the rotation motor 76, and the wrist body 81 is rotated 90 degrees counterclockwise in FIG. 1 by the operation of the rotation motor 82. The rear support arm 79 is rotated and moved forward by the operation of the telescopic motor 80, so that the claw 11 held by the gripping fingers 83, 83 faces the front of the claw guide groove 44. Next, the support arm 79 is rotated counterclockwise in FIG.
1 to 4 to move the sliding part of this pawl 11 toward
It is fitted into the pawl guide groove 44 as shown in FIG. 8 and FIG. When the sliding portion of pawl 1 is fitted into the pawl guide groove 44 in this way, the front corner of the sliding portion of the pawl 11 is fitted into the notch 46.
．． 46 and pressed against the bottom surface 44a to determine the front and rear positions, and the locking portion 55a of the locking piece 55 of the claw moving device 48 is engaged in the engagement groove 22,
The claw 11 is prevented from falling. After that, the gripping fingers 83.
83 is rotated outward by the operation of the gripping motor 84 to release the grip of the pawl 11 as shown in FIG. next,
The piston rod 39 of the claw removing cylinder 36 in the claw removing device 35 is operated to project and lower the movable piece 40, whereby the pressing pin 41 is moved to the operating pin 1 as shown in FIG.
7 towards the center of the chuck, and the engager 115 is pushed into the spring 18.
The positioning pin 42 is fitted into the positioning hole 12, and the relative positions of the guide block 33 and the chuck body 5 are determined. Therefore, the guide groove 34 of the guide block 33 and the pawl guide groove 44 of the pawl guide body 43
is positioned exactly in line with the mold mounting groove 9 indexed at the pawl exchange position A. Furthermore, when the movable piece 40 is lowered as described above, the operation guide piece 60 is moved rearward.

Next, the piston rod 50 of the claw moving cylinder 48 is actuated to project and lower the movable body 52. As the movable body 52 descends, the locking portion 55a of the locking piece 55 moves into the pawl guide groove 44.
The pawl 11 located at
Since the nail 11 is fitted into the mold mounting groove 9 while being guided by the guide groove 34 located in a straight line with the
The fitting can be performed reliably. Further, when the movable body 52 descends to fit the claw 11 into the mold mounting groove 9 as described above, the operation guide piece 60 is moved backward, so the operation portion 56a of the operation piece 56 will not be pressured by The lowering of the moving body 52 is carried out by the nut 6.
6 comes into contact with the collar 49a of the claw moving cylinder 49 and is stopped, whereby the claw 11 fitted into the mold mounting groove 9 by the locking piece 55 is positioned at a predetermined position. after that,
The piston rod 39 of the claw release cylinder 36 is retracted and the movable piece 40 is raised, which causes the suppression pin 41 to release the operation pin 17 from being pushed in and the positioning pin 4
2 is removed from the positioning hole 12. When the operating pin 17 is released, the engaging element 15 is moved forward by the force of the spring 18 as shown in FIG. 10, and the engaging tooth 15a is engaged with the engaging tooth 11a of the pawl 11. In addition, the movable piece 4
0 moves the operation guide piece 60 forward,
As a result, the operation guide piece 60 is connected to the operation part 56 of the operation piece 56.
Press a to move the locking piece 55 backward. Therefore, the engaging portion 55a of the locking piece 55 is connected to the claw 11 as shown in FIG.
from the engagement groove 22. Next, the claw moving cylinder 4
The piston rod 50 of No. 9 rises to its original position. After that, the next die mounting groove 9 of the chuck 4 is indexed to the jaw exchange position A, and the robot 71 takes out the second stage jaw 11 (b) of the jaw storage magazine 67 and guides the jaw 11. Groove 44
, and the claws 1 and 1 are fitted into the mold mounting groove 9 in the same manner as described above. Thereafter, in the same manner as above, the third stage claw 11 (c) of the claw storage magazine 67 is attached to the die mounting groove 9 of the chuck 4.
The attachment of the three claws 11 to the chuck 4 is completed. After that, the piston rod 32a of the lifting cylinder 32
is operated to protrude and raise the elevating body 31, and then the piston rod 29a of the longitudinal movement cylinder 29 is operated to retract and lift the base plate 2.
7 is moved rearward, whereby the guide block 33 and claw moving device 48 are moved to a standby position where they do not interfere with the machining operation. Further, after the robot 71 performs the work of loading the workpiece onto the chuck 4, the support stand 73 is moved to the left in FIG. The workpiece is moved, and then the door is closed and processing of the workpiece is started.

Next, the claw 1 attached to the chuck 4 as described above
A case will be described in which the replacement claw 11 is replaced with another replacement claw 11. First, one of the jaws 11 of the chuck 4 is indexed to the jaw replacement color MA and stopped at that position, and the apparatus main body 26 is moved to the operating position shown by the solid line in FIG. 2 in the same manner as described above. Next, the piston rod 50 of the claw moving cylinder 49 is operated to project and lower the movable body 52. This moving body 52
As a result, the operating part 56a of the operating piece 56 comes into contact with the operating guide piece 60 and is pressed forward, whereby the locking piece 5
5 is moved backwards. Therefore, at the lowest position of the movable body 52, the locking portion 55a of the locking piece 55 is located behind the engagement groove 22 of the claw 11, as shown in FIG. Next, the piston rod 39 of the claw removing cylinder 36 is operated to project and lower the movable piece 40. As the movable piece 40 descends, the suppressing pin 41 pushes the operating pin 17 to disengage the engagement element 15 and the claw 11, and the positioning pin 42 fits into the positioning hole 12, causing the guide block 33 and chuck body 5 to be disengaged. Position the relative position of. Further, as the operation guide piece 60 is moved rearward, the locking piece 55 is moved forward, and the locking portion 55a of the locking piece 55 is fitted into the engagement groove 22 of the claw 11. Thereafter, the piston rod 50 of the claw moving cylinder 49 is retracted into the movable body 5.
2 to its original height. As the movable body 52 rises, the locking portion 55a of the locking piece 55 engages with the engagement groove 22, pulls out the pawl 11 from the mold mounting groove 9, guides the pawl 11 into the guide groove 34, and guides the pawl 11 into the pawl guide groove. 44. Thereafter, the piston rod 39 of the claw release cylinder 36 is retracted to raise the pressing pin 41 and the positioning pin 42 and move the operation guide piece 60 forward again. On the other hand, after the door opens, the robot 71 operates and grips the fingers 83.
As shown in FIG.
is pressed in front of the After that, grip the claw 11 with the finger 83
．． 83 and take it out from the claw guide groove 44, and
is fitted into the original heavy electric coupling groove 70 of the claw storage magazine 67 (for example, if the claw 11 is taken out from the first heavy electric coupling groove 70, the first heavy electric coupling groove 70). Thereafter, the three claws 11 of the chuck 4 are fitted into the original heavy electric coupling grooves 70 of the claw storage magazine 67 in the same manner. Thereafter, the claws 11 at desired positions of the claw storage magazine 67 are sequentially gripped with the fingers 83 .
83 and take it out, and install it in the three mold installation grooves 9 of the chuck 4 in the same manner as described above. After that, the device body 2
6 is returned to the standby position, and the support arm 7 of the robot 71 is
The 9th class was also moved outside the canopy 23, and the opening/closing door was then closed.

The claws 11 of the chuck 4 may be replaced by attaching new claws 11 to the mold mounting groove 9 each time the claw 11 is removed from the mold mounting groove 9.

(Effects of the Invention) As described above, in the present invention, the mold mounting groove at the jaw exchange position of the chuck and the jaw guide groove of the jaw guide body are located in a straight line, and the gap between the mold mounting groove and the jaw guide groove is In this case, the jaws are moved in a straight line by the jaw moving device, and the jaws are gripped and moved by the robot between the jaw guide groove and the holder of the jaw storage magazine, so when you want to replace the jaws of the chuck with a replacement jaw. By holding a different replacement claw in the holder in advance, the other claw can be mechanically and automatically replaced with the replacement claw, thereby saving labor. Since it is installed around the machine tool, the free space around the machine tool can be used to store the holder for the jaw storage magazine, and the number of sets of replacement jaws stored can be significantly reduced. There are many possible effects. Ma.

As mentioned above, the movement of the claw between the holder of the claw storage magazine and the claw guide groove of the claw guide is performed by a robot installed around the machine tool.

The device installed in the machine frame of the machine tool can be miniaturized, so it can be easily implemented on small machine tools, and it can also be used as a robot for loading and unloading workpieces, which has the effect of lowering the total cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application; FIG. 1 is a partially cutaway plan view, FIG. 2 is a partially cutaway left side view, and FIG. 3 is a partially cutaway front view. Fig. 4 is an enlarged view of the main part showing the main part in cross section, Fig. 5 is an enlarged sectional view along the ■-V line,
Figure 6 is an enlarged view of the part seen from the arrow ■ direction, and Figure 7 is ■-.
8 is an enlarged sectional view taken along line ■-■, FIGS. 9 and 10 are explanatory diagrams of operation, and FIG. 11 is a left side view showing the operating state indicated by the imaginary line in FIG. 1. . 2...Machine frame, 4...Chuck, 9...Mold mounting groove, 26...Device body, 43...Claw guide, 4
4... Claw guide groove, 48... Claw moving device, 67.
...Claw storage magazine, 70...Heavy electric coupling groove (holder), 71...Robot, A...Claw exchange position patent applicant Howa Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A device body is provided in a frame of a machine tool so as to be movable back and forth in a machine tool frame in which the chuck's jaw mounting groove can be indexed to the jaw exchange position, and the device body has a chuck in the forward end position. A nail guide body having a nail guide groove located on the same straight line as the nail mounting groove at the nail exchange position is provided, and the nail can be moved linearly between the nail guide groove and the nail mounting groove. A claw storage magazine is provided with a claw moving device, and has a large number of holders that can detachably hold replacement claws around the machine tool, and the holders of the claw storage magazine and the claws are installed around the machine tool. A chuck jaw changing device equipped with a robot capable of gripping and moving the jaws between the jaw guide grooves of the guide body. 2. The chuck jaw changing device according to claim 1, wherein the jaw guide and the jaw moving device are provided in the main body of the device so as to be movable up and down.