JPH0575522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a claw storage magazine for an automatic chuck claw changing device that automatically replaces the claws installed in the claw sliding grooves of the chuck according to the workpiece.

BACKGROUND TECHNOLOGY The claw storage magazine of the automatic chuck claw changing device has conventionally been a disk-shaped magazine main body which is indexably supported on a base, as disclosed in Japanese Patent Application Laid-open No. 73208/1983. The magazine body is integrally equipped with a large number of holders that hold pawls, one pawl is fitted into each holder, and this magazine body is positioned with high precision between the base and the pawl sliding groove of the chuck and the holder. A device in which the retaining grooves are aligned in a straight line and the claws can be replaced has been put into practical use.

Problems that inventions aim to solveIn recent years, as factories have become more and more FMS-oriented,
In order to process a wide variety of workpieces over a long period of time, there is a demand for holding a larger number of claws in the claw storage magazine than before, so a large number of holders are integrally mounted on the outer circumference of the disc as described above. In order to hold a large number of claws in a magazine equipped with a magazine, the external shape of the disk becomes extremely large, which creates problems in terms of space and overall balance of the device. I had a problem that I couldn't do it.
Furthermore, once such a holder that is attached to the magazine body is assembled, the parallelism of the holding groove of the holder to the sliding groove of the chuck is determined, so the entire part of the claw storage magazine is There was a problem that it had to be processed according to the system.

Means for Solving the Problems In the present invention, in order to solve the above-mentioned problems, a large number of holders holding the pawls are indexed to predetermined positions, and the pawl exchange indexing position is located on an extension line of the pawl sliding groove of the chuck. In the pawl storage magazine positioned at The holders are mounted on the chain at equal intervals, guide rollers are rotatably supported above and below the link pins of the link chain, and the upper guide roller is rotatably supported on the upper front of the holder. At the same time, a support roller is pivotally supported at the rear of the holder around an axis perpendicular to the link pin, and the base has a guide groove that guides a guide roller at the bottom of the link pin along the link chain and a guide that horizontally supports the support roller. A lower guide rail with a surface and an upper guide rail with a guide groove for guiding the upper guide roller are respectively arranged, and are located at a pawl exchange indexing position on a line connecting the centers of the front and rear chain sprockets. The base part corresponding to the holder is provided with a guide surface that guides the guide roller at the top of the link pin along the link chain, and the lower guide rail corresponding to this guide surface is separated from the other lower guide rails. The lower guide rail is attached to the base so that its position can be adjusted freely by means of a mounting hole in the base, a set bolt, and an adjustment bolt screwed into the lower guide rail, and a positioning cylinder that engages and disengages with a positioning hole provided in the holder is provided in the base portion. It is characterized by having been installed.

Function According to the above configuration, it is a magazine system using a chain, and at the claw exchange indexing position, the upper guide rail that guides the upper guide roller of the holder and the guide surface that guides the upper guide roller of the link pin. In contrast, adjust the position of the lower guide roller that guides the lower guide roller and horizontal support roller of the holder using the adjustment bolt, so that when the holder is in the indexed position, the holding groove of the holder is parallel to the chuck's pawl sliding groove. By ensuring that the holder is indexed with high stopping accuracy during indexing by the upper and lower guide rails, guide surfaces, and positioning cylinder, without requiring high machining accuracy for the entire part of the claw storage magazine, the holder The holding groove of the chuck and the pawl sliding groove of the chuck are aligned in a straight line to facilitate the replacement of the pawl.

Embodiment In the drawings, 1 is, for example, an NC lathe, 2 is its headstock, and 3 is its main spindle. At the tip of this main spindle 3 is a quick change chuck (hereinafter referred to as chuck) 4, as shown in FIG. It is installed. This chuck 4 is disclosed, for example, in Japanese Patent Application Laid-Open No. 59-19612, and the chuck body 5 has radial pawl sliding grooves 6, 7, a sliding member 8, and a sliding portion 9 of the pawl 9.
a are fitted so as to be slidable in the radial direction, and the wedge portion 8a at the center of the sliding member 8 engages with the wedge surface 10a of the wedge piece 10 connected to the drawbar. Slider member 8 due to axial movement
is designed to move in the radial direction. The slider member 8 has a positioning hole 11 formed in its upper surface as shown in FIG. 5, and also includes an axially slidable engagement member 12 and a radially slidable operating pin 13. . Meshing member 12 and operation pin 13
and engage with each other with engagement surfaces inclined in the sliding direction,
By pushing in the operating pin 13 from the outer circumferential side, the latch on the back surface of the claw 9 and the latch at the tip of the engaging member 12 are disengaged, and by returning them to their original positions, both latches are engaged with each other by the spring 14. This chuck 4 is moved to a predetermined pawl exchange position A (1) by an NC device (not shown).
It is configured to be indexed and stopped in a state in which the two pawl sliding grooves 6 and 7 face upward. The claw 9 is
A hook-shaped locking portion 9b is formed at the upper part of the back surface toward the rear. A fixed base 15 of a feed unit 17 is fixedly mounted on the headstock 2, and a slide base 16 is mounted so as to be slidable in the front-rear direction along its guide portion 15a. A fluid pressure cylinder 18 is mounted on the lower surface of the slide base 16, and the tip of its piston rod 18a is connected to the fixed base 15, so that the slide base 16 is positioned at a predetermined forward end by the action of a stopper (not shown). .

Next, the holder 20 is provided with a large number of holders, and one of the holders is moved to the pawl exchange index position (FIG. 1B) located on the extension line of the pawl sliding groove of the pawl exchange position A of the chuck. This is a claw storage magazine that is positioned with the base 16 at the forward end. In Figures 3 and 4, this claw storage magazine 2
0 will be explained.

A shaft 21 parallel to the pawl sliding grooves 6 and 7 of the chuck 4 indexed to the pawl exchange position A is fixed to the front part of the slide base 16, and a driven gear 22 and a chain sprocket 23 are integrally attached to this shaft 21. It is fitted so that it can rotate. Further, at the rear of the slide base 16, as shown in FIG. 2, another chain sprocket 25 is rotatably supported on a base plate 24 whose position can be adjusted in the front and back direction. A link chain 30 consisting of a long link 26, a short link 27, two link pins 28, and a roller 29 (see FIG. 6) that meshes with the teeth of the sprocket is wound between the two. Reference numeral 31 designates a holder provided with a holding groove 32 for holding a replacement claw, and the link pin 28 passes through the bracket 33, and guide rollers 34 and 35 are rotatably fitted to the upper and lower parts of the link pin 28, respectively. A large number of holders 31 are attached to the link chain 30 at equal intervals in the moving direction. The bracket 33 is connected to the upper guide rollers 34, 34.
A positioning hole 36 is bored in the middle part of the
Support rollers 37 that rotate about a horizontal axis are disposed on both sides of the back surface of the bracket 33, and upper guide rollers 39 that rotate about a vertical axis are disposed on the front surface of the holder 31 via an L-shaped bracket 38. 4
0 is the front support body, and the chain sprocket 23
The slide base portion (that is,
An upper guide rail 41 for guiding the upper guide roller 39 is attached to the upper part of the front support body 40. 41 is formed with an arcuate guide groove 42 that extends along the link chain 30. Further, a link pin 28 is provided at the front part of the middle plate 43 of this front part support body 40.
A supporter 45 having an arc-shaped guide surface 44 for guiding the upper guide roller 34 is fixed.
Further, on the front side of the shaft 21, an adjustment bolt 47 that contacts the shaft 21 is screwed into the center of the fan-shaped lower guide rail 46 so that the position of the fan-shaped lower guide rail 46 can be adjusted in the front-rear direction. The lower guide rail 46 has an arcuate guide groove 49 that guides the guide roller 35 below the link pin 28 along the link chain 31, and a horizontal guide groove 49 that horizontally supports the support roller 37. A guide surface 50 is provided. In this embodiment, the first guide member is connected to the upper guide rail 41 and the supporter 45, and the lower guide rail 46
constitutes a second guide member, and guides the holding groove 32 of the holder 31 in parallel with the pawl sliding grooves 6, 7 of the chuck 4 indexed to the pawl exchange position A by the respective guide surfaces and guide grooves. Furthermore, as shown in FIG. 6, the slides are made with relative precision during assembly so that there are gaps N and M in the chain movement direction between the teeth of the chain sprocket 23 and the rollers 29 of the link pins 28. The longitudinal position of the second guide member is adjusted with respect to the first guide member fixed to the base 16 and a guide block to be described later. This gap is set to be larger than the cumulative indexing error due to chain elongation, sprocket tooth profile, machining, etc. This adjustment may be made during or after assembly, but the slide base 16 is positioned at the forward end, and the holding portion G inserted into the holding groove 32 instead of the claw as shown in FIG.
1 is held in the holding groove 32 of the holder 31, the holder 31 is positioned using a positioning pin described later, and the set bolts 48, 48 are loosened.
The adjusting bolt 47 is adjusted within the gap between the mounting holes of the slide base 16 for the set bolts 48, 48 so that the gauge G is smoothly inserted into the guide block to be described later. A positioning cylinder 52 having a positioning pin (diamond pin) 51 at its tip that engages with the positioning hole 36 of the bracket 33 is further disposed on the middle plate 43 of the front support body 40. A drive gear 54 is meshed with the driven gear 22. Further, a timing belt pulley 55 is integrally connected to the driven gear 22, and a timing belt 57 is wound between the driven gear 22 and an encoder 56 fixed to the front support 40. The encoder 56 controls the rotation of the chain sprocket 23. is detected, and the holder 3 is controlled by a control device (not shown).
1 (claw) to control indexing.
Note that there are also straight upper and lower guide rails 41 in other parts of the slide base 16 along the link chain 30.
A, 46A and arc-shaped upper and lower guide rails 41
B, 46B are arranged. Reference numeral 58 denotes a rail notched below the holder 31 located at the index position for changing the claw, and a sliding portion of the claw 9 held in the holding groove 32 of the holder 31 disposed along the entire circumference of the link chain 30. It supports the lower surface of 9C.

Next, the claw replacement device will be explained. The exchange device is composed of a guide block 60 at the front end of the slide base 16 and a claw moving device 61. This guide block 60 is attached to the holder 3 in the claw exchange indexing device B.
When 1 is positioned, chuck 4 at pawl exchange position A
The guide block 60 is provided with a guide groove 62 formed so as to be substantially continuous in a straight line with the pawl sliding groove 7 of the guide block 60.The guide block 60 is provided with a pawl removing cylinder 63 at the rear thereof, and a piston rod tip of the pawl removing cylinder 63 is provided with a piston rod. A positioning pin 64 that fits into the positioning hole 11 of the slider member 8 of the chuck 4 in the indexed state.
And a press pin 65 for pressing down the operation pin 13 is fixed. Further, an operation guide piece 66 is disposed in the passage groove of the guide block 60 and moves back and forth as the piston rod moves up and down. The pawl moving device 61 has a movable body 68 fixed to the tip of the piston rod of the pawl exchange cylinder 67 above the holder 31 located at the pawl exchange index position B of the front support 40. A locking piece 69 and an operating piece 70 are fitted in the front-rear direction into a guide groove formed in the guide groove, and both ends of a link 71 whose intermediate portion is pivotally connected to a movable body are connected to both with pins, and further, a spring 72 is used to The operating piece 70 is normally biased backwards, and the locking piece 6
The tip of 9 is in a state of protruding forward.

According to such a configuration, the quick change chuck 4 is moved to a predetermined pawl replacement position A according to a command from the NC device.
, and also moves the claw storage magazine 20 forward to index the empty holder 31 to the claw exchange indexing position B.
The positioning cylinder 52 descends and the positioning pin 5
1 is driven into the positioning hole 36 of the bracket 33. At this time, the holder 31 engages the support roller 37, the guide rollers 34 and 35 above and below the link pin, the upper guide roller 39, and each guide surface and guide groove.
Positioning is performed with high precision regardless of the indexing precision of the chain sprocket 23. Then, the movable body 68 of the claw changing device is lowered, the operating piece 70 engages with the protruding operating guide piece 66, and the tip of the locking piece 69 retreats, causing the hook-shaped locking portion of the claw 9 of the chuck 4 to move downward. 9
b and the sliding member 8. Next, the piston rod of the claw release cylinder 63 descends to release the chuck 4.
is positioned and the operation pin 13 is pushed down, whereby the operation guide piece 66 retreats and the operation piece 70 is returned by the force of the spring 72, and the tip of the locking piece 69 engages with the hook-shaped engagement portion 9b of the claw 9. While engaged, the engaging member 12 of the chuck 4 moves back and disengages from the rack of the pawl 9. Next, the movable body 68 is raised, and the claw 9 passes from the chuck 4 through the guide block 60 to the empty holder 31.
to be held. Further, the piston rod of the claw release cylinder moves back to release the chuck 4 from its position, and the operating pin 13 is returned to its original position. Hereinafter, this operation is repeated as many times as the number of pawls held by the chuck, and when the next pawl 9 is to be supplied, the locking portion 9b of the indexed new pawl 9 is attached to the locking piece 69 of the pawl replacement device at the rising end.
are engaged by indexing movement. Next, the piston rod of the claw release cylinder 63 is lowered to position the chuck 4, the operating pin 13 is pushed down to move the engaging member 12 backward, and the operating guide piece 66 of the guide block 60 is moved backward. Next, the moving body 68
is lowered, and the pawl 9 is inserted into the pawl sliding groove 7 of the chuck 4. Next, the piston rod of the claw release cylinder 63 is raised, and the operating piece 70 is pushed against the spring force to remove the locking piece 69 from the hook-shaped retaining groove 9b of the claw 9. At the same time, the chuck 4 is positioned and the operating pin 1 is removed.
3 is released, and the engaging member 12 is engaged with the latch of the claw 9. Next, the moving body 68 is raised to index the next holder 31, and this operation is repeated thereafter.

In addition, when indexed, chain sprocket 23
Because there is a gap between the link chain 30 and the link chain 30,
Even when the positioning pin 51 is driven into the bracket 33, the roller 29 of the link chain 30 does not hit the chain sprocket 23, and the link pin 28 (link chain 30) is not damaged. Further, the pawl storage magazine using such a chain sprocket may be constructed not only in one stage as in this embodiment but also in multiple stages. Since the holder 31 is positioned in the horizontal direction by the support rollers 37, only a force is applied between the chain sprocket 23 and the link chain 30 in the direction of transport of the link chain 30, and the weight of the link chain 30 is transferred to the chain sprocket. 23
It doesn't cost anything.

Effects of the Invention As described above, in the present invention, holders are mounted at equal intervals on the link chain wound between the chain sprockets supported at the front and rear of the base, and guides are placed above and below the link pins of the link chain, respectively. The roller is rotatably supported, and the holder has an upper guide roller rotatably supported at the upper front of the holder, and a support roller is rotatably supported at the rear of the holder around an axis perpendicular to the link pin. Along the link chain, a lower guide rail is provided with a guide groove that guides the guide roller at the bottom of the link pin and a guide surface that horizontally supports the support roller, and an upper guide rail that is provided with a guide groove that guides the upper guide roller. Since they are arranged separately, it is extremely easy to hold and index more pawls than before by setting the distance between their centers to be large without increasing the diameter of the chain sprocket. The arrangement of the magazine device is also well balanced. Furthermore, even though the link chain is used to hold more pawls than before, the weight of the link chain is not added to the sprocket because the support rollers roll on the lower guide rail. At the top, at the claw exchange indexing position, the bottom guide rail is moved within the range between the mounting hole of the base and the bottom of the set bolt by the adjustment bolt against the guide surface that guides the top guide rail and the guide roller at the top of the link pin. Therefore, the parallelism of the holder's holding groove to the chuck's pawl sliding groove can be adjusted to the best possible condition. In addition to not requiring high machining accuracy, it can be adjusted to create a gap between the chain sprocket and the link chain during positioning, and the chain sprocket will not be damaged by the force associated with positioning by the positioning cylinder. Furthermore, since the holder is positioned at the pawl exchange indexing position by the upper and lower guide rails, guide surfaces, and positioning cylinder, it has the advantage that even if the indexing accuracy due to the chain and sprocket is low, the holder can be stopped with high accuracy. .

[Brief explanation of the drawing]

Fig. 1 is a side view of an automatic chuck pawl changing device equipped with a pawl storage magazine according to the present application, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a cross-sectional view of the main part, and Fig. 4 is a chuck pawl of Fig. 3. FIG. 5 is a front view of FIG. 3, FIG. 6 is an enlarged cross-sectional view taken along the Y-Y line of FIG. 3, and FIG. 7 is a front view of the gauge. 4...chuck, 7...claw sliding groove, 9...claw,
21...Shaft, 23, 25...Chain sprocket, 28...Link pin, 30...Link chain, 34, 35...Guide roller, 36...Positioning hole, 37...Support roller, 39...Top Guide roller, 42, 49... Guide groove, 44, 50...
Guide surface, 46... Lower guide rail, 47... Adjustment bolt, 48... Set bolt, 52... Positioning cylinder.

Claims (1)

[Claims] 1. A holder equipped with a holding groove for removably holding a replacement pawl is provided on a base so that it can be rotated many times, and the holder is moved to a predetermined position located on an extension line of the pawl sliding groove of the chuck indexed to the pawl replacement position. In a pawl storage magazine of an automatic chuck pawl exchanger positioned at a pawl exchange indexing position, a chain sprocket is supported at the front and rear of the base so as to be rotatable about an axis parallel to the pawl sliding groove. The holders are mounted at regular intervals on a link chain wound between these chain sprockets, and guide rollers are rotatably supported above and below the link pins of the link chain. An upper guide roller is rotatably supported at the upper part of the front surface, and a support roller is supported around an axis perpendicular to the link pin at the rear of the holder, and a guide roller below the link pin is mounted on the base along the link chain. A lower guide rail is provided with a guide groove to guide and a guide surface to horizontally support the support roller, and an upper guide rail is provided with a guide groove to guide the upper guide rail. A guide surface for guiding the upper guide roller of the link pin along the link chain is provided on the base portion corresponding to the holder located at the claw exchange index position on the connecting line, and a lower guide corresponding to this guide surface is provided. The rail is separated from the other lower guide rail, and the separated lower guide rail is attached to the base using a mounting hole in the base, a set bolt, and an adjustment bolt screwed into the lower guide rail so that the position can be adjusted freely, and a holder is attached to the base part. A claw storage magazine for an automatic chuck claw changing device, characterized in that a positioning cylinder that engages and disengages from a positioning hole provided in the chuck claw is attached.