JPS6018264Y2 - Nut temporary feeding stop device in automatic pierce nut assembly equipment - Google Patents

Description

[Detailed description of the invention] In this invention, the end face of the nut acts as a punch, and at the same time punches out the metal panel placed on the caulking die, the side edge of the punched hole is caulked to punch the nut itself into the metal panel. This invention relates to an automatic assembly device for so-called pierce nuts that are fixed.

The automatic pierce nut assembly device is attached to a press machine, and pierce nuts (hereinafter simply referred to as nuts) that are continuously supplied through a chute hose are placed between the press punch and the crimping die of the assembly device in conjunction with the vertical movement of the press ram. The nuts are held one by one, and as the pressing punch descends, the pressing punch press-fits the nuts into the metal panel.

By the way, when the automatic pierce nut assembly device as described above is installed in a press machine together with other press dies and operated at the same time, it is often necessary to temporarily stop the supply of nuts due to the relationship with the other dies. required.

For example, when temporarily stopping some of the assembly devices assembled together with other molds, when replacing other molds, or when testing the alignment of molds. etc.

In view of this, the present inventor has previously proposed a temporary nut feeding stop device that can temporarily stop the supply of nuts by a simple operation while the pierce nut assembly device is set in the press machine ( U.S. Patent No. 4.153.9
8 inches, see Jitsugan No. 51-166295).

The present invention is an improvement on the nut temporary feeding/stopping device according to the above-mentioned application, and is characterized in that it has a simple structure and can be remotely operated.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes an automatic pierce nut assembly device (hereinafter referred to as an assembly device), and other press molds 21 to 23
It is attached to the upper die 3 and lower die 4 of the gusset, which are attached together with the ram or slider of the press machine.

As shown in FIG. 2, the assembly device 1 includes a lower die 4
A caulking die 5 fixed to the caulking die 5, a pressing punch 6 arranged opposite to the caulking die 5 and fixed to the upper mold 3 via a holder 7, and a vertical hole 9 through which the pressing punch 6 is slidably inserted. Equipped with a nut holding block 8 having a nut supply hole 10 perpendicular to the vertical hole 9, pierced nuts are continuously supplied through a flexible chute hose 12 connected to the nut holding block 8 via a chute connection fitting 11. Nuts 17 (hereinafter simply referred to as nuts) are fed to a supply 10 and held one by one at a position where the vertical hole 9 and the nut supply hole 10 intersect.

Regarding this nut holding device, for example,
Since it is disclosed in Japanese Patent No. 2069, details will be omitted.

The nut holding block 8 is attached to the holder 7 so as to be slidable in the vertical direction via a guide post 13 fixed to the upper side thereof, and is engaged with an engagement groove 14 carved in the side surface of the guide post 13 and extending in the vertical direction. The vertical sliding range is limited by engaging the dowel pin 15, and the holder 7 is constantly urged downward by the action of the spring 16.

When the upper die set 3 descends, the entire nut holding block 8 continues to descend in the posture shown in FIG. 2 until the nut holding block 8 comes into contact with the metal panel 18 placed on the die 5. When the nut holding block 8 comes into contact with the metal panel 18, the nut holding block 8 stops and only the pressing punch 6 further descends.

As shown in FIG. 3, below the pressing punch 6, the nut 17 held in the vertical hole 9 of the nut holding block 8 is pressed against the metal panel 18 by the pressing punch 6, and the end surface of the nut 17 is pressed against the metal panel 18. At the same time as the panel 18 is punched out, the side edge of the punched hole is caulked with a caulking die 5, and the compressed excess thickness is press-fitted into the groove 19 provided on the side of the nut 17, so that the nut 17 is fixed to the metal panel 18. It has become.

At the upper end of the engagement groove 14, there is an outer step portion 14□ with a high upper limit.
An inner step portion 14° with a lower upper limit is provided.

On the other hand, the engagement pin 15 is fitted into a mounting hole 20 provided in the holder 7 so as to be slidable left and right, and the pin tip 15a is selectively inserted into one of the two stepped portions 141.14° of the engagement groove 14. It is designed so that it can be engaged with.

When the pin tip portion 15a engages with the outer step portion 141, the pressing punch 6 operates normally as described above, and the second
At the position shown in the figure, the nuts 17 supplied through the nut supply hole 10 are sequentially fed below the pressing punch 6, and as the upper mold 3 of the screw set descends, the nuts 17 are pressed by the pressing punch 6 as described above and assembled into the panel 18. It is now possible to

Further, when the pin tip 15a engages with the inner step 14°, the nut holding block 8 is displaced upward relative to the pressing punch 6, as shown in FIG. 4, and as a result, the pressing punch The lower end of the nut 6 descends to a position where the vertical hole 9 and the nut supply hole 10 intersect, partially closing the end opening of the supply hole 10, and feeding of the nut 17 is stopped.

That is, even if the assembly device 1 moves up and down in conjunction with the upper die set 3 in this state, the pressing punch 6 always remains in the nut supply hole 1.
Since the end opening of 0 is closed, nut feeding through the vertical hole 9 is reliably prevented.

A collar-shaped head 21 and a connecting part 22 having a cavity 23 are integrally provided at the outer end of the retaining pin 15.
By pressing 1 with the push spring 24, the pin tip 15
a is urged toward the inside of the engagement groove 14.

Reference numeral 25 denotes an air cylinder device for operating the retaining pin 15, which is attached to the holder 7 via a bracket 30, and has a flange 29a of a connecting rod 29 connected to the tip of the piston rod 28.
is connected to the engagement pin 15 by being engaged in the space 23 of the connecting portion 22 so as to be able to freely move within a certain range.

When pressurized air is supplied to the cylinder 26 through the hose 31, the piston 27 moves to the rear end as shown in FIG.
is pushed back against the push spring 24, and the pin tip 15a
is engaged with the outer step portion 141.

In this state, the pierce nut is assembled as described above.

Therefore, pressurized air is constantly supplied to the cylinder 26 during assembly work.

Then, when the supply of compressed air to the cylinder 26 is cut off, the engagement pin 15 is pushed back toward the inside of the retaining groove 14 by the action of the push spring 24, and the upper mold 3 of the screw set descends to complete the nut assembly process. In the process of rising, as shown in FIG. 4, the pin tip 15a engages with the inner step 14°, and as a result, the lower end of the pressing bunch 6 closes the end opening of the nut supply hole 10. As described above, the feeding of the nut 17 into the vertical hole 9 is stopped.

Normally, the compressed air supplied to the cylinder device 25 comes from an air compressor attached to a press machine that operates the pierce nut assembly device or to factory equipment including the press machine.

Therefore, if the pressurized air supplied to the cylinder device 25 is cut off at the same time as the operation of the press machine or factory equipment is stopped, the nut 17 is automatically fed in conjunction with the stop operation of the assembly device. can be stopped.

Further, there is a certain distance of play in the axial direction between the connecting portion 22 of the locking bottle 15 and the connecting rod 29 of the cylinder device 25,
As shown by the imaginary line in FIG. 4, the engagement pin 15 is completely removed from the engagement groove 14 by manual operation.

This allows the guide post 13 to be easily inserted into and removed from the holder 7.

As described above, according to the device of the present invention, it is possible to temporarily stop the feeding of nuts to the automatic pierce nut assembly device by remote control, and the assembly device can be placed deep inside a large press machine into other press dies. This is particularly effective when used in combination with

Furthermore, when the drive source of the cylinder device is cut off, the retaining bin is automatically displaced to the temporary feeding stop side by the action of the push spring, so if the stop of the pierce nut assembly device and the cutoff of the drive source are linked. When the assembly device is stopped and then restarted, even if the upper die of the screw set is moved up and down for die matching, etc., there is no risk of the nut being accidentally fed into the vertical hole of the nut holding block, making it difficult to use and handle. It's advantageous.

Moreover, the structure of the device is simple and there are fewer failures.

[Brief explanation of the drawing]

Figure 1 is a front view showing the state of use of the automatic pierce nut assembly device equipped with the device according to this invention, and Figure 2 is A of Figure 1.
- An enlarged sectional view taken along line A; Fig. 3 is an enlarged longitudinal sectional front view of the main part in the same operating state; Fig. 4 is a drawing similar to Fig. 2, showing a state in which nut feeding is temporarily stopped. FIG. 1...Earring nut automatic assembly device, 21-23
・・・・・・Press mold, 3・・・・Glue set upper mold, 4・・・・Glue set lower mold, 5・・・・Crimping die, 6・・・・Press Bunch, 7...
・Punch holder, 8...nut retaining block,
9...Vertical hole, 10...Nara 1 to supply hole, 12---Chute hose, 13...
Guide post, 14...Engagement groove, 14□...
...Outer step, 14°...Inner step, 15.
...Engagement pin, 24...Press spring, 25
・・・・・・Cylinder device.

Claims (3)

[Scope of utility model registration request] (1) A press punch 6 placed opposite the caulking die 5 on which the metal panel 18 is placed is attached to a holder 7 fixed to the press ram, and a vertical hole 9 into which the press punch 6 is inserted so as to be vertically slidable; A nut holding block 8 having a nut supply hole 10 perpendicular to the vertical hole 9 is attached to the holder 7 via a guide post 13 so as to be slidable in the vertical direction. A retaining pin 15 attached to the holder 7 engages with an engaging groove 14 extending in the holder 7 to limit the vertical sliding range of the nut retaining block 8. While the nut retaining block 8 moves up and down together with the pressing punch 6, In an automatic pierce nut assembly device that is configured to move vertically relative to the punch 6, the upper end of the engagement groove 14 has an outer stepped portion 14 with a higher upper limit and an inner stepped portion 14° with a lower upper limit. is provided, and the engaging bottle 15 is attached to the holder 7 so as to be able to slide left and right, and the head connected to the outer end of the engaging bottle 15 is pressed by a pressing spring 24 to close the tip of the bottle 1.
5a is urged inside the engagement groove 14, and the tip portion 1
The pressing punch 6 is configured to always close the end opening of the nut supply hole 10 when the nut 5a engages with the inner step 14°,
And the screw 1- of the cylinder device 25 is attached to the head of the engagement bottle 15.
The locking rod 28 is connected, and when the cylinder device 25 is operated, the engagement pin 15 is moved backward against the push spring 24, and the ζ pin tip 15a engages with the outer stepped portion 141 to hold the pressing punch 6 and the nut. A nut temporary feeding stop device in which the block 8 is configured to perform a normal up-and-down movement. (2) There is a certain distance of play in the axial direction of the locking pin 15 at the connecting part between the head of the locking pin 15 and the cylinder device 25, and the engaging pin 15 is manually moved from the locking groove 14 to the A temporary feeding stop device for oaks 1 to 1 as set forth in claim 1 of the Utility Model Registration Claim, which is adapted to be detachable at any time. (3) The nut temporary feeding stop device according to claim 1 or 2, wherein the driving source of the cylinder device 25 is compressed air.