JPS641244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an automatic all-joe changing device for an automatic chuck having three or four jaws used in a lathe or the like.

BACKGROUND OF THE INVENTION With the development of automatic tool changing devices for machining centers, automatic tool mounts or tools are now being replaced in lathes, and it is also being considered to replace chuck jaws. One idea is to replace the chuck jaws one by one with a magazine installed on the outside of the chuck, as known from, for example, Japanese Patent Application Laid-Open No. 55-70507. Since the chuck is indexed and replaced every time the jaw is replaced, replacement takes time and is not efficient. It is also possible to replace all the jaws at the same time.
It is known as No. However, this structure is quite complex and there is still room for practical improvement.

OBJECTIVES Therefore, the present invention aims to provide an automatic chuck jaw changer that can efficiently replace all the jaws at the same time, and can be assembled compactly and installed on a robot or the like.

Solution: On the front side, there are radially arranged jaw retaining grooves with the number of integral multiples of 2 or more for each of the three jaws of the chuck to store multiple sets with the same jaws in three equal positions, and A magazine rotating magazine with a donut-shaped magazine that can be fitted and removed on the outer periphery, and three support arms that can open and close the magazine, and is attached to a robot etc. by rotating and removably supporting the magazine and having a concentric function around the gripping center. a supporting means and a support means capable of simultaneously locking to each jaw of said chuck or each jaw of a jaw magazine corresponding to the jaw position of said chuck, and moving the locked jaws simultaneously in a radial direction between the chuck and the jaw magazine; A jaw changing means which has three exchange arms that are moved simultaneously, whose locking and holding center coincides with the gripping center of the magazine rotation support means, and which has a concentric function of the locking and holding center; The magazine is provided with a magazine indexing means for indexing the holding groove to the exchange position, and the magazine is fitted onto the outer periphery of the chuck which has a jaw restraint release member on the outer periphery at the time of exchange.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. First, a chuck that can be used in the present invention will be explained. This chuck can already be used as the chuck in Japanese Patent Publication No. 57-42443, which was filed by SMV Unider und Weishaubt of the Federal Republic of Germany, and the structure is clear from this specification. However, the outline will be explained as it is necessary to explain the present exchange device. Jaws 4 having teeth 3 are respectively inserted into T-slots 2 cut into three equal parts radially oriented on the front surface of the chuck frame 1. Three wedges 5 are provided for the radial movement of the jaw 4, which wedges 5 are inserted into grooves 6 running tangentially to the axis of rotation of the chuck. The wedge rod 5 has a toothed edge 7 on the front surface, and the teeth 3 of the jaw 4 engage in the toothed edge 7. Each wedge 5 is provided with a cavity 8 in connection with the toothed edge 7 so that the jaw can be released from the toothed edge 7 when the tooth 3 of the jaw 4 disengages as will be explained below. For actuation of the wedge rod 5 arranged transversely to the axis of rotation, an adjusting member 9 is provided which is movable in the direction of the chuck axis, and this adjusting member 9 is connected via a rod 10 to a piston of a hydraulic cylinder device (not shown). They are connected and movable in the axial direction. The adjustment member 9 has protrusions 11 extending in a direction perpendicular to the groove 6 at three equal positions on the tip thereof, and the tip of each protrusion 11 having a rhombic cross section is engaged with the diagonal groove 12 of the wedge rod 5. By moving the adjusting member 9 in the axial direction, the wedge rod 5 is moved in the groove 6 in the tangential direction of the rotating shaft, and the toothed edge 7 of the wedge rod 5 and the teeth 3 of the jog 4 cause the wedge rod 5 to be moved in the axial direction. is moved radially. When the adjusting member 9 is pushed out and the wedge rod 5 is moved to the position shown in FIG. 4
However, in the present invention, a means for automatically disconnecting the joint is added. That is, the protruding portion 11 of the adjusting member 9 can escape through the axis-perpendicular groove 22 extending to the oblique groove 12. On the opposite side of the wedge rod 5 from the diagonal groove 12, an L-shaped groove 23 is cut in an axial direction 23a and an axis-perpendicular direction 23b. A cam gear 17 having a center is mounted on the shaft, and a pin 17a at the end of the shaft engages in an L-shaped groove 23. The pin 17a is the protrusion 1 of the adjustment member 9.
1 is engaged in the groove 23b located in the oblique groove 12, and when the protrusion is in the position shown in FIG. 6, the pin 17a is located at the bending point of the L-shaped groove as shown in FIG. The cam gear 17 has a rack 16 inserted into a groove 24 parallel to the wedge rod 5 and biased to the right in FIG. 9 by a spring 21.
are engaged with each other, and the lower half of the rack 16 forms a diagonally cut surface 16a. This rack 16
A release knob 15, which has a slope 15a slidingly in contact with the slope 16a and whose head 15a protrudes outside the frame serves as a cam surface, is engaged with a groove 25 opening in the side surface of the chuck frame in the radial direction.

Next, a description will be given of the magazine for replacing the magazine for this chuck. Magazine disc 5
Since the chuck has three jaws 1, T grooves 51a are radially carved on the front surface thereof into which the T portions 4a of the jaws 4, which are an integer multiple of 2 or more than 3 (18 in this embodiment), are inserted. It is a donut-shaped disk having a hole that fits smoothly on the outer diameter of the chuck frame 1,
On the back side, there are the same number of Geneva gears 5 corresponding to the T grooves 51a.
1b has a V-groove 51c cut on its outer periphery.
A notch hole 51d parallel to the axis of the disc is bored in the T-slot 51a, and the notch 52 engages with the tooth 3 of the jaw 4 inserted into the T-slot 51a, and the strength is adjusted using a stop bolt 53. The spring 50 is engaged so as to release at a predetermined pressure. The T-slot 51a is equipped with a set of three pieces of the same-shaped jaws 4 at three equal positions, and on the front surface opposite to the T-section 4a of the jaws 4 are mounted at the same position. An arcuate engagement groove 4b is cut in the groove 4b and is located on the same circumference and concentric with the center. This groove 4
b has engaging pins 54, 67, 6 as shown in FIG.
8. The jaw 4 is replaced by a device having a concentric function in which the locking and holding center is engaged at three points and moved by the same amount in the same direction toward the centers of the three points.

The exchanging device has an exchanging arm 56 within a frame 55 whose tip end is guided by a bracket 57 and whose rear end is connected to a cylinder 58.
a symmetrical prismatic drive swash plate 6 connected to the piston rod 59 of the piston and movable in the axial direction;
0. On the other hand, the other exchange arms 61 and 62 are levers that are rotatably supported on pivots 63 and 64.
A driving swash plate 6 formed in a prismatic shape to connect the book exchange arms 56, 61, 62 relative to each other
0 is important. This drive swash plate 60 has its slope 6
0a and 60b act on rollers 65 and 66 pivotally supported at the inner ends of exchange arms 61 and 62. and roller 6
Springs 72 and 73 are stretched between the pins 69 and 70 and between the pins 69 and 71, respectively, so that the slopes 60a and 60b are always in pressure contact with each other.

Next, the support device for the donut-shaped disk 51 can be of the same type as the above-mentioned interchangeable arm device. That is, the support arms 83, 84, 85, each having a V-shaped roller 80, 81, 82 pivoted at its tip, which fits into the V-shape of the outer circumferential groove 51c of the disk 51, each have the same related mechanism as the exchange device. and frame 8
6, and are moved by the same amount in the same radial direction with respect to the gripping center by the hydraulic cylinder 87.

The indexing device for the magazine 51 is then attached to the rear side of the frame 86 of the support device. In this indexing device, a bracket 91 to which a motor 92 is fixed is fastened to a frame 86 of a support device.
1, a shaft 95 of a gear 94 that meshes with a gear 93 of an output shaft of a motor 92 is supported by a bearing, and a disk 96 is attached to the end of the shaft 95. An arcuate cam 97 is concentrically protruded from this disc 96, and an index pin 98 is implanted on the outer edge of the disc at the center of the notch.
The arcuate cam 97 fits into the arcuate recess 51d of the Geneva gear on the back side of the donut-shaped flat plate 51, and the index pin 9
8 engages with the groove 51b of the Geneva gear. The cylinders 58 and 87 of the support device and the exchangeable arm device are integrally attached to a robot (not shown) or the like and can be replaced with a new magazine at a replacement position and a standby position, or at a magazine stocker.

Next, the effect will be explained. When the Jyo replacement number is commanded based on the command of the workpiece for the next machining, the NC
The indexable spindle of the lathe is indexed to a fixed position for jaw change, and the adjustment member 9 of the chuck is pushed by the piston via the rod 10 so that the projection 11 is positioned as shown in FIG. On the other hand, in the jaw exchange device attached to the robot, multiple sets of jaws 4 of the same shape are installed in the T-slots 51a at three equal parts of the disk 51, and held by the notches 52, one set of the T-grooves of the three equal parts are installed. supports an empty magazine with no mounted magazine, and sends pressure oil to the cylinder 58 so that the engaging pins 54, 67, and 68 are positioned closer to the center and transports it to the front of the chuck, and then transfers it to the chuck frame 1. Insert. During this fitting, when the release knob 15 protruding from the outer periphery of the chuck frame 1 is pushed in from the slope of the top surface by the disc 51 of the magazine, the slope 15a of the bottom surface releases the release knob 15.
The cam gear 17 that is engaged with the rack 16 is rotated by pushing the slope 16a of the cam gear 6 and moving within the groove 24.
Therefore, the pin 17a at the shaft end of the cam gear 17 moves into the axial groove 23a of the L-shaped groove 23 of the wedge rod 5 and is engaged in the direction perpendicular to the axis, so that the wedge rod 5 is moved to the space 8. Therefore, the tooth profile 7 of the wedge rod 5 and the teeth 3 of the jaw 4 are disengaged. At the same time, the engagement pins 54, 67 of the exchangeable arms 56, 61, 62 of the exchangeable arm device,
68 is engaged with the arcuate groove 4b on the front surface of the jaw 4 of the chuck. Next, the disk 96 is rotated by the motor 92 of the indexing device, and the disk 51 is rotated by the Geneva gear mechanism.
The empty T-slot 5 is indexed intermittently into the T-slot 2 of the chuck.
Figure out 1a. and the cylinder 58 of the interchangeable arm device.
Switch the direction of the pressure oil and pull the piston to release the engagement pin 5.
4, 67, and 68 are stretched radially outward by the same amount, the three jaws 4 of the chuck will become the disk 5 of the magazine.
The notch 52 engages and holds the tooth 3 of the jaw 4 by the force of the spring 54. Then, when the motor 92 of the indexing device is rotated again to the commanded number position of the jog, the disc 51 is intermittently rotated, and at this time, the replacement arm members 56, 61, 62 are rotated intermittently.
The engaging pins 54, 67, and 68 pass through the arcuate groove 4b of the jaw 4 and are indexed until the T-slot of the commanded jaw number matches the T-slot of the chuck. In this case, the holding position of the jaw 4 is determined by, for example, a bank district method. When the desired position is indexed, the pressure oil in the cylinder 58 of the exchange arm device is switched again and the engagement pins 54, 67 of the exchange arms 56, 61, 62,
68 is moved toward the grip center against the engagement force of the notch 52, and the three jaws 4 are moved to the T-groove 1a of the chuck frame 1. Next, the magazine disk 51 is moved in the chuck axis direction by the robot, removed from the chuck frame 1, and returned to the standby position. When the disk 51 is removed from the release knob 15, the return pin 20, which is pressed by the spring 19 which urges the wedge rod 5 in the moving direction, returns the wedge rod 5 to the position shown in FIG. The teeth 3 of are engaged with each other. The rack 16 is also returned by the force of the spring 21, and the release knob 15
It is also pushed back by the slopes 16a, 15a and protrudes outside the chuck frame 1. When the three jaws 4 are replaced in this way, the adjusting member 9 is moved forward and backward to grip and process the workpiece.

Note that the 16th example shows another embodiment of the interchangeable arm device.
In the figure, an exchange arm 103 concentrically connected to a piston rod fitted in a fluid pressure cylinder 102 attached to the central rear wall of a frame 101 has an engaging pin 104 at its tip, and has a rack of the same pitch in the axial direction on both sides. 1
03a and 103b are engraved, and the tip is supported by a frame 101. A guide groove 101 intersects this exchange arm 103 at an angle of 60 degrees from the left and right directions.
a, 101b are cut, and this guide groove 10
1a, 101b bent at 120° with engagement pin 10 at the tip
Exchangeable arms 105 and 106 are slidably supported, and have racks 105a and 106a of the same pitch engraved in correspondence with the racks 103a and 103b of the exchangeable arm 103, respectively.
A gear 109 meshing with the rack 103b of the replacement arm 103 and a rack 106a of the replacement arm 106 is provided, and a gear 110 having the same number of teeth as the gear 109 meshing with the rack 103a of the replacement arm 103 and the rack 105a of the replacement arm 105 is provided. It is being Therefore, when pressurized oil is sent to the cylinder 102, the exchange arm 103 is moved to move toward the centers of the three points in the same direction and by the same amount. This mechanism can be used for support devices as well.

Effects As detailed above, according to the present invention, the jaws of the chuck are fitted into the chuck frame that can be replaced with a single touch, and the jaws of the chuck can be stored radially in an integral multiple of 2 or more, and the magazine is a device that has three arms and has a concentric gripping function for rotatably supporting the magazine so that it can be transported by a robot, etc., and a device that indexes the magazine;
Since it is combined with a jyo exchange device that has a concentric function with a locking and holding center that has two interchangeable arms, it is possible to exchange three jyo at the same time on the spot in an extremely short time. Therefore, it can be easily transported or stored at a predetermined location, improves workability, and can be easily disposed so as not to interfere with machine operation. Furthermore, by operating the fluid pressure cylinder, the magazine can be easily replaced in a short time. Furthermore, since the magazine rotation support member and the jaw exchange means have a concentric function, accurate jaw exchange is possible without shifting the center even when exchanging magazines having different outer diameters.

[Brief explanation of drawings]

Fig. 1 is a front perspective view of a chuck and a Jyo automatic changer according to the present invention, partially shown in section; Fig. 2 is a rear perspective view of the Jyo automatic changer;
The figure is a front view showing a part of the chuck in cross section.
The figure is a cross-sectional view taken along the line A-A in FIG. 3, FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 3, and FIG. 6 is a cross-sectional view taken along the line B-B in FIG. 7 is a sectional view taken along the line C-C in FIG. 3, FIG. 8 is a sectional view taken along the line C-C in FIG. 3 with the jaw disengaged, and FIG. 9 is a sectional view taken along the line D-- D line sectional view, Figure 10 is E in Figure 9
- E line sectional view, Fig. 11 is a vertical cross-sectional explanatory view when the JY automatic exchange device is attached to the chuck, Fig. 12
The figure is an explanatory diagram of the Jiyo interchangeable arm device, Figure 13 is a magazine disk support device, Figure 14 is a partial sectional view of the indexing drive section, Figure 15 is a view taken along line FF in Figure 14, and Figure 16. FIG. 6 is a diagram showing another embodiment of the interchangeable arm device. DESCRIPTION OF SYMBOLS 1...Chuck frame, 2...T groove, 4...Jyo, 5...Wedge rod, 9...Adjustment member, 11...Protrusion, 15...Release knob, 16...Rack, 17...
...Cam gear, 51...Magazine disc, 51a...
...T groove, 56, 61, 62... Replacement arm, 83, 8
4, 85...support arm, 96...disc, 97...cam, 98...pin.

Claims (1)

[Claims] 1. In a power chuck power chuck power exchange device that has a built-in mechanism for quickly removing the joint and has a restraint release member for the joint on the outer periphery, the number of joint retaining grooves radially arranged on the front surface is an integral multiple of 2 or more for the number of joints of the chuck (3). a donut-shaped jyo magazine which stores a plurality of sets of jyos in three equal positions at a predetermined position and can be fitted onto and removed from the outer periphery of the frame of the power chuck; and three jyo magazines that can be opened and closed. a magazine rotating support member that is rotatably and removably gripped by two support arms and is attached to a robot or the like and has a concentric function with a gripping center; The magazine rotation support member has three exchange arms which can be simultaneously locked to respective jaws of the magazine and which can be exchanged by simultaneously moving the locked jaws between the chuck and the magazine in the radial direction. A jyo exchange means provided so that the gripping center and the lock holding center coincide with each other and having a concentric function of the lock holding center, and a jyo exchange means provided on the magazine rotation support member for indexing the jyo magazine holding groove to the exchange position. 1. An automatic magazine indexing means for a chuck, characterized in that when a magazine is inserted into the chuck, a magazine restraint release member is activated to enable magazine exchange.