JPH031131Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present application relates to a claw attaching/detaching device for an automatic claw changing chuck, and is intended to quickly and reliably attach and detach the claws when replacing the claws.

PRIOR TECHNOLOGY Many applications have been filed for automatic claw changing devices for automatically changing chuck claws, and the present applicant has also applied for numerous automatic claw changing devices, including Japanese Patent Application Laid-open No. 59-73208 and Japanese Patent Application Laid-Open No. 59-73210. Applications have been filed, and many are in practical use.

Problems that the invention aims to solve Needless to say, automatic replacement of the claws in a chuck involves removing the used claws from the chuck, holding them in a magazine, and then pooling them in the magazine for use in the next process. To automatically perform all the operations of taking out a used nail from a magazine and attaching this nail to a chuck from which a used nail was first taken out, without manual intervention.

As described above, in an automatic claw changing device, a claw attaching/detaching device that transfers the claws between the chuck and the magazine and attaches and detaches the transferred claws to the chuck is extremely important. The claw attaching/detaching device in the conventional device described above consists of a locking piece that directly hooks the nail, an operation piece that operates the locking piece, a link that connects the two, and a cylinder outside the nail that operates the rack pin. The guide piece is operated in conjunction with the operation of the guide piece, and the pawl is attached and detached by pressing or releasing the pressure on the operation piece at the pawl exchange position.

Problems to be solved by the invention As mentioned above, the above conventional device has a locking piece,
It consists of many parts, including an operating piece, a link, a spring that biases the operating piece, and three connecting pins, which not only requires a lot of work to process and assemble, but also makes it difficult for the pressed operating piece to return to its original position, that is, to lock. Since the return of the locking piece relies on the spring force of a small spring, the operation may become uncertain due to deterioration of the spring after long-term use, viscosity of cutting oil, intrusion of chips, etc., and the erosion of the locking piece may cause linkage. The fact that this is done indirectly through the .

Means for Solving the Problems The present application relates to an improvement of the conventional device described above, in which a member that was conventionally composed of many parts such as an operating piece and a locking piece is made into an integral locking body, and this is fixed by a spring. The operation of biasing the locking body forward to maintain the hooked position and positioning the locking body between the hooking position and the release position at the pawl exchange position is an operation that operates in conjunction with the operation of the locking body and the pawl release cylinder. This method eliminates the drawbacks of the conventional device described above by forcibly fitting the male and female bodies into an integral and inseparable state.

Embodiments The present application will be described in detail below with reference to drawings showing embodiments. Prior to that, in order to aid understanding of the present application, an overview of the chuck and pawl automatic exchange device in the conventional device described above will be summarized. In Figure 2, 1 is a chuck, and the chuck body 2 has a master jaw 3.
is slidably inserted into the master jaw 3, and the master jaw 3 has a T-shaped slope protrusion 4 provided on the end face on the axis side.
It fits into the T-shaped sloped groove 6 of the wedge plunger 5 and is connected to the wedge plunger 5 by a conventionally widely known so-called wedge-type connection method, so that the wedge plunger 5 is connected in the axial direction of the wedge plunger 5. The movement causes the master jaw 3 to slide up and down in the radial direction.

Reference numeral 7 denotes a rack pin having a rack 8 carved on its front end surface, which is loosely fitted into the master jaw 3 so as to be able to slide in the axial direction, and is biased toward the front side of the chuck body 2 by a spring 9, and is pushed to the most forward end. Only the rack 8 protrudes from the front surface of the master jaw 3, and an inclined groove 10 is provided on one side of the outer peripheral surface of the rack pin 7. Reference numeral 11 denotes a claw release pin for operating the rack pin 7. The claw release pin 11 is provided with an oblique guide protrusion 13 that fits into the inclined groove 10 of the rack pin 7.
3 fits into the inclined groove 10, the claw removing pin 11 is pushed up by the spring 9 via the rack pin 7, and when the claw removing pin 11 is pushed in by some means, the guide protrusion 13 and the inclined groove 10 are pushed up. Due to this action, the rack pin 7 presses the spring 9 and retreats, causing the rack 8 to retract from the front surface of the master jaw 3. When the push-in is released, both the rack pin 7 and the claw release pin 11 return to their original positions.

Reference numeral 14 denotes a pawl, and a rack 15 is provided on the back side of the pawl 14 with a catch groove 16 on the upper back end surface, and is fitted into the chuck main body 2 so as to be able to slide in the radial direction. It is attached to the chuck body 2 by engaging with the rack 8 of the chuck.

Next, the outline of the automatic claw changing device 17 will be summarized. The automatic claw changing device 17 includes a magazine 18 having a holder 19 that pools a plurality of sets of claws 14 for the next process, moves back and forth between the magazine 18 and the chuck 1, and removes used claws attached to the chuck 1. 14 from chuck 1 and magazine 18.
A claw attaching/detaching device 20 that takes out the claws 14 for the next process pooled in the magazine 18 and inserts the claws 14 into the chuck 1, and drive devices 21 that cause these devices to perform predetermined operations. The main part thereof is moved along a predetermined route between the working position shown in FIGS. 1 to 3 and a standby position (not shown), and attaches and detaches the claw 14 at the working position. However, both the automatic pawl changing device 17 and the chuck 1 are well known in the prior art devices described above.

The present application relates to an improvement of the claw attaching/detaching device 20 in the automatic claw changing device 17, and the details thereof are as follows. In FIG. 1 or 2, 22 is a transport body,
It is attached to the piston rod 24a of the cylinder 24 provided in the machine frame 23, and reciprocates between the magazine 18 and the chuck 1 at the working position where the pawl is replaced, and hooks the pawl 14 with a locking body 25, which will be described below, to release the pawl. 14 is carried out, and the upper and lower ends of the stroke of the cylinder 24 are regulated by stopper bolts 26. As shown in FIGS. 4 and 6, the locking body 25 is fitted into a guide groove 22a provided at the lower end of the transfer body 22 so as to be slidable in the front and rear direction.
A tongue-shaped engaging piece 27 is protruded from the front side, and a T-shaped engaging piece 28 is protruded from the rear side. The latching piece 27 is biased toward the front side by the spring 30, and the latching piece 27 protrudes from the side wall surface of the transfer body 22.
7 adjusts the rising end of the stroke of the cylinder 24 using the stopper bolt 26 so that it is approximately at the same height as the engaging groove 16 provided in the pawl 14 for the next process pooled in the magazine 18. . 31 in the figure is a retaining pin of the locking body 25.

The operating body 32 is positioned in the middle of the transfer path of the claw 14 from the chuck 1 to the magazine 18.
Guide block 3 attached to automatic claw changing device 17
3, the guide surface 34 is attached so as to be slidable in the front-rear direction, and as shown in the drawing, the guide surface 34 slopes toward the rear side of the chuck main body 2, and the engaging piece 2
The T-shaped engagement groove 35 that engages with the operating body 32
It is provided so as to pass through both the upper and lower ends of the. A sloped portion 36 having a T-shaped cross section is provided at the rear end of the operating body 32, and this sloped portion 36 fits into a sloped groove 37 having a T-shaped cross-section provided in the mounting piece 40 of the claw removal cylinder 38. Therefore, when the declawing cylinder 38 is activated and the piston rod 38a protrudes, the operating body 32 moves forward, and vice versa. Reference numeral 39 denotes a return protrusion located directly above the operating body 32.

When the work with the claws 14 attached to the chuck body 2 is completed and the claws are to be replaced due to changes in the workpiece, etc., any part of the attached claws 14 can be replaced by a command from a command device (not shown). By indexing and stopping the book at a predetermined claw replacement position, and then moving the wedge plunger 5 forward, the claws 14 gripping the workpiece are released from their grip and preparations are made for the claw replacement. On the other hand, when the above preparatory operation is completed or in parallel, the claw changing device 17 moves from a standby position (not shown) to a working position and stops. The holder 19 of the magazine 18, which has been emptied in advance, is located almost directly above the claw 14 attached to the chuck body 2, which was indexed by the claw changing device in the above, and is attached to the claw removing cylinder 3.
8 is at the highest end, so the operating body 32 is waiting at the retreat position.

When each preparatory operation is completed as described above, the cylinder 24 is then operated and the locking body 25 starts lowering. 19a, so it does not interfere with the magazine 18, and when the locking body 25 is pushed by the spring 30 and is on the forward side, the engaging piece 28 does not interfere with the return protrusion 39. Because of this, the descent will be carried out without any problems. Just before the descending locking body 25 reaches the lowest end, the engaging piece 28 engages the operating body 3.
2, and as it descends thereafter, the entire locking body is guided by the guide surface 34 and pulled rearward, and the protruding catch piece 27 engages the catch groove 1 of the pawl 14.
6, and in this state, the engaging piece 28 fits into the engaging groove 35, and when the lowering of the locking body 25 is completed, the pulling piece 27 moves behind the engaging groove 16 of the pawl 14. I will confront this as if I were directly facing it.
(FIG. 1) When the locking body 25 has finished lowering, the pawl release cylinder 38 is activated and the piston rod 38a protrudes, and by pushing down the pawl removal pin 11, the rack pin retreats and the pawl 14 is engaged with the rack 15. At the same time, the piston rod 38a protrudes, causing the operating body 32 to move forward, and the locking body 25 that is integrally fitted therewith to move forward from the retracted position. enters into the groove and locks the pawl 14. Both of the above operations are performed in parallel, but even if there is a slight difference in timing, the rack pin 7 is installed inside the rack pin 7, is biased forward by the spring 43, and the tip protrudes from the rack 8 surface. Since the claw 14 is hooked to the temporary fixing pin 42, the claw 14 will not fall off.

When the hook 27 hooks the claw 14, the cylinder 24 operates to pull up the transfer body 22, and the claw 14 is pulled out from the chuck body 2 while pushing the temporary fixing pin 42 and rises, and is engaged immediately after starting to rise. piece 2
8 is disengaged from the inclined groove 35, but the locking body 25
maintains the current state by the biasing force of the spring 30 and transfers the hooked claw 14 to the holder 19 of the magazine 18, and then attaches the temporary fixing pin 4 provided on each of the holders 19.
The rack 15 is hooked to the locking pin 42A having the same structure as 2, and the claw 14 is held in the magazine 18 (the third
(Figure) When one of the used claws 14 is pulled out from the chuck main body 2 and held in the magazine 18 as described above, the magazine 18 performs one pitch indexing rotation, and this rotation causes the magazine to be The used claw 14 held by 18 is attached to the engaging piece 27
Then, the pawl 14 for the next process pooled in the magazine 18 rotates toward the catch piece 27, and the catch groove 16 engages with the catch piece 27 from the lateral direction. The state is the same as shown in FIG. Next, in the same manner as above, the cylinder 24 is operated to lower the transfer body 22, and the pawl 14 is pulled out below the magazine 18 while pushing in the locking pin 42A, and is transferred to the attachment/detachment position, and is attached to the chuck body 2. The engagement piece 28 also fits into the engagement groove 35 again, resulting in the same state as in FIG. 2.

When the above operation is completed, the claw release cylinder 38 is operated and the protruding piston rod 38a returns to its original position, releasing the claw release pin 11 from being pushed down. The chuck moves forward while being pushed up, and the rack pin 7 engages with the racks 8 and 15 of the pawl 14, so that the pawl 14 is firmly attached to the chuck body 2. As the piston rod 38a returns, the operating body 32, which had been moving forward at the time of the protrusion, retreats, and the engaging piece 28 forcibly pulls back the engaging body 25, which engages the engaging piece 28. 16 is disengaged, and the claw 14 is released from the lock. If there is a timing difference between the above two operations, the temporary locking pin 42 is used as described above. cover.

When the above is completed, the cylinder 24 operates again to pull up the transfer body 22, thereby causing the engagement piece 28
is disengaged from the engagement groove 35, and the locking body 25 is released from the spring 3.
It returns to the forward position by the urging force of 0, but if it does not return for some reason, the engagement piece 2
8 interferes with the return protrusion 39 to forcibly return the locking body 25, and the transfer body 22 reaches the predetermined highest point, completing one cycle of attaching and detaching the claw 14. From then on, the chuck body 2 is indexed. Rotate to position the next pawl 14 to be replaced at a predetermined position, and repeat the same operation as described above to replace all the pawls 14.

Effects of the invention As described in detail above, the present application changes a device that conventionally consisted of several parts and performed indirect operation into an integrated structure so that it can perform direct operation. Since the stop body is fitted to the operating body and forced to move forward and backward to a predetermined position, there are no operational errors, and this is a great idea that not only increases the reliability of automatic machines but also contributes to improved functionality. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIGS. 1 to 3 are partially cutaway side views of only the main parts, FIG. 4 is a rear view of the transport body, and FIG. 5 is a partial plan view of the magazine. FIG. 6 is a cross-sectional view taken along the line in FIG. 5, and FIG. 6 is an enlarged sectional view taken along the line in FIG. 1...chuck, 2...chuck body, 3...
Master Jiyo, 7... Rack Pin, 8, 15...
...Rack, 14...Claw, 17...Claw automatic exchange device, 18...Magazine, 20...Claw attaching/detaching device, 2
2... Transfer body, 24... Cylinder, 25... Locking body, 27... Pulling piece, 28... Engaging piece, 32...
Operating body, 34... Guide surface, 35... Engagement groove, 38
...Claw removal cylinder.

Claims (1)

[Scope of utility model registration request] The claw of the drug to be used, which is held by a master jaw attached to the chuck body and is attached to the chuck body by engaging with a rack pin that slides in the front and back direction of the chuck body, is automatically extracted from the chuck and held in the magazine. In an automatic nail changing device that removes the nails for the next process pooled in the magazine and automatically attaches them to the chuck, a transfer body that reciprocates between the magazine and the chuck's nail changing position is used. It is related to the operation of a locking body that is loosely fitted and biased toward the front side by a spring, and has a pull piece on the front side and an engagement piece on the rear side, and a claw release cylinder that operates the rack pin. A pawl attachment/detachment device for an automatic pawl exchange device, comprising an operating body provided with an engaging groove that engages with an engaging piece of the locking body.