JPS5941020Y2 - Nut duplication prevention device for automatic nut tightening machine - Google Patents

Description

[Detailed description of the invention] This invention is a machine that automatically tightens the Nand, and if there is a misalignment between the axes of the Nand and the bolt or if there is a mistake in tightening the bolt, the Nand will not be tightened and will be left in the box pin. The present invention relates to a device that prevents the supply of the next new Nando from being obstructed by returning to the original position.

Generally, when tightening the NAND from the bottom to the top as shown in FIG. The nut 1 is supplied guided by a guide rod 20, and after the nut 1 is once held by the box pin 14, the entire NAND driver is raised toward the bolt 23 of the workpiece 22 by a separately provided lifting means 2, and the NAND 1 is It is tightened to bolt 23.

However, when tightening the NAND in this way, the axes of the NAND and the bolt may be misaligned and the NAND cannot be tightened, or the NAND or the bolt may become loose and the NAND may not be tightened to the bolt and may remain in the box pin and remain in the specified position. After the time has elapsed, the Nando driver will descend and the next Nando will be fed into the box pinto and may overlap.
It was impossible to tighten the nuts and bolts.

In view of these problems, this invention was devised for the purpose of ensuring that only newly supplied Nandos are tightened and held in the box focus for each work.This invention is based on the following drawings. An example will be explained.

In FIG. 1, reference numeral 2 denotes an air cylinder as a lifting means for raising and lowering the NAND driver A, and the piston ronds of the NAND driver A and the air cylinder 2 are connected by a support block 3.

In addition, the air cylinder 2 is fixed to a fixed base 4,
A bearing device 6.degree. 7 is fixed to the fixed base 4 for guiding the slide rod 6 upwardly and downwardly in a reciprocating manner.

The slide rod 5 is provided with the support block 3 so as to be able to slide back and forth, and a plate 26 at the rear end of the slide rod 5 is capable of abutting against a stopper bolt 8 fixed to the bearing I, allowing the slide rod 5 to rise. An adjustable stop member (not shown) is mounted to prevent the oscilloscope in place.

Further, a tension spring 9 is disposed between the plate 26 and the support block 3, and this tension spring 9 always urges the slide rod 5 upward. A fixed force 2-10 abuts the support block 3.

Furthermore, a guide holder 13 is fixed to the tip of the slide rod 5, and a cylindrical cover 11 at the tip of the NAND screwdriver A is fixed via a mounting bracket 12. 14 so that it can slide back and forth and rotate freely.

On the other hand, the rear end of this cylindrical cover 110 is loosely inserted into the tip of the guide sleeve 15 of the NAND driver A, and the rotating shaft (not shown) of the motor (not shown) of the NAND driver A is inside the guide sleeve 15. A stepped focus holder shaft 17 is attached to the tip of the drive shaft 16, which is connected via a flange (not shown) on the same center line as the
is the provision.

The drive shaft 16 and the focus holder shaft 17 are hollow cylindrical, and the guide pin 24, which is installed perpendicular to the center line of the focus holder shaft 17, is provided opposite to the center line of the drive shaft 16. The drive shaft 16 and the focus holder shaft 17 are connected to be extendable and retractable and integrally rotatable by engaging with the long grooves 16a, 16a.

Further, a first compression spring 18 is inserted into the drive shaft 16 to always urge the bin-halter shaft 17 upward, and the guide pin 24 is always engaged in the direction of the distal end of the long grooves 16a, 16a.

Furthermore, as shown in FIG. 2, a box pin 14 is fixed to the tip of the focus holder shaft 17, which holds the NAND 1 and has a fitting hole 14a for transmitting rotation to the NAND 1. 14 and focus holder shaft 17
A guide hole 14b and a hollow hole 17a bored on the center line of
A guide rod 20 having a short cylindrical portion 19 and a conical tip is loosely inserted therein.

As shown in FIGS. 3 and 4, the short cylindrical portion 19 of the guide rod 20 is provided with a plurality of threads 119a (six in this embodiment) cut in parallel along the axis at equal intervals. There is.

In this embodiment, the short cylindrical portion 19 is provided with a slit 19a as an air guide path, but instead of the slit 19a, a small hole may be provided.

Further, a second compression spring 21 is disposed in the hollow hole 17a, one end of which contacts the short cylindrical portion 19 of the guide rod 20 and urges the guide rod 20 upward. The forward movement is restricted by the upper surface of the short cylindrical portion 19 and the lower surface of the box bin 14.

Furthermore, as shown in FIGS. 2 and 5, the mounting bracket 12
An annular groove 12a having a concave cross section is cut into the inner circumferential surface.
This annular groove 12a is connected to a compressed air source (not shown) via an air switching valve (not shown) that operates for a predetermined time when the focus holder shaft 11 is lowered to a predetermined position after completing the NAND tightening operation. It is connected to and serves as a passage through which air from the compressed air source passes.

Furthermore, an air hole 17b is drilled in the cylinder of the bit holder shaft 170 to match the annular groove 12a at a predetermined position after tightening the NAND, and the air pumped at this time flows from the annular groove 12a to the air hole. It passes through the hole 17b → hollow hole 17a → slint 19a and is discharged from the gap between the guide hole 14b and the guide rod 20.

Next, the operation of this embodiment will be explained.

As shown in FIG. 1, the NAND 1 is supplied in advance from a NAND feeding device (not shown), guided by the guide rod 20, and held in the fitting hole 14a of the box pinto 14, before starting work. When the signal is input, the rotating shaft of the motor starts rotating, and at the same time, the air cylinder 2 of the lifting means operates, the NAND driver A and the guide holder 13 rise together, and the guide holder 13 stops at the stop member at the rear of the slide rod 5. rises until it abuts against the stopper bolt 8 of the bearing 1 and then stops.

On the other hand, the Nantes driver A continues to rise further against the tension spring 9, and as shown in FIG. Immerse yourself in Nando 1
comes into contact with the bolt 23 of the workpiece 22, so rotation is transmitted from the motor to the drive shaft 16, the box pin 14 rotates, and the Nand 1 is tightened to the bolt 23.

When the NAND tightening operation is completed in this manner, the NAND driver A is lowered by the air cylinder 2, so that the guide rod 20 and the NAND driver A return to their original states.

At this time, since air is force-fed from the compressed air source via the air switching valve, the air passes through the annular groove 12a → the air hole 17b → the hollow hole 1γa → the slint 19a, and passes through the gap between the guide hole 14b and the guide rod 20. , are discharged from the fitting hole 14a for a predetermined period of time.

After this, one NAND 1 is again supplied from the NAND feeding device into the fitting hole 14a, and the 1 cycle is completed.

Next, even though the tightening of NAND 1 and bolt 23 using NAND driver A was completed for a predetermined period of time, the axes of NAND 1 and bolt 23 were misaligned, or there was a mistake in tightening due to loose screws, etc. If the NAND 1 is not tightened to the bolt 23 due to the NAND 1 being lowered and the NAND 1 returns to its original position while remaining in the fitting hole 14a as the NAND driver A descends, it will The NAND 1 discharged from the fitting hole 14a does not overlap with the next NAND 1 newly supplied.

As explained above, in the present invention, when tightening the Nand 1, air is discharged from the fitting hole 14a of the box pin 14 for a predetermined period of time at the return position of the NAND driver A after the work is completed, so that the Nand and the bolt are tightened. Even if the NAND remains in the fitting hole of the box pin and returns as one with the NAND driver due to misalignment of the axis center or loose screws, etc., the NAND will be reliably removed by air at the return position. Therefore, it will not overlap with the next new Nando.

Also, when tightening the NAND to the bolt above from below, dirt can easily enter the fitting hole of the box pin, which may prevent the NAND from being held in the correct position. Since it is configured to be ejected, dirt does not accumulate in the fitting hole, and the nandos are held accurately, which has extremely significant effects.

In the above embodiment, an air guide path such as a slit or a pore was provided in the short cylindrical portion, but the same effect can also be obtained by providing an air path 25 in the guide rod 20 as shown in FIG. it is obvious.

[Brief explanation of drawings]

Fig. 1 is a partial sectional front view showing an embodiment of the present invention, Fig. 2 is an enlarged partial sectional front view showing the operation of the embodiment, Fig. 3 is a front view showing a guide rod according to the invention, and Fig. 4. 3 is a plan view of FIG. 3, FIG. 5 is an enlarged sectional front view of a main part of the present invention, and FIG. 6 is a front view of another embodiment in which an air passage is formed in a guide rod. A is a NAND driver, 1 is a NAND, 2 is an air cylinder, 3 is a support block, 4 is a fixed base, 5 is a slide rod, 6 and 7 are black bearings, 8 is a stopper bolt, 9 is a tension spring, 10 is a collar 11 is Cylindrical cover 12 is a mounting bracket, 12a is an annular groove, 13 is a guide sleeve, 1
4 is a box focus, 14a is a fitting hole, 14b is a guide hole, 15 is a guide sleeve, 16 is a drive, 16a is a long groove, 17 is a focus holder shaft, 11a is a stepped hole, 11b is an air hole, 18 is a 1 is a compression spring, 19 is a short cylindrical portion, 19a is a slit, 20 is a guide rod, 21 is a second compression spring, 22 is a workpiece, 23 is a bolt, 24 is a guide bin, 25 is an air passage, and 26 is a plate.

Claims (1)

[Claims for Utility Model Registration] l) A box pin that holds the Nando is provided so as to be movable and rotatable, a guide hole is bored in the box pin, and a guide rod is placed in the guide hole with a slight gap therebetween. Automatic NAND tightening is a NAND duplication prevention device of the machine, which is arranged so that it can be freely retracted and is configured to discharge air from the compressed air source through the gap between the guide hole of the air box bin and the guide rod. 2) A utility model characterized in that the box focus is fixed to a hollow cylindrical bit halter shaft, and the guide rod is loosely inserted into the focus holder shaft and attached to a short cylindrical part having a plurality of air guide paths. The automatic NAND tightening device according to claim 1 is a NAND duplication prevention device for a machine. 3) An automatic NAND duplication prevention device for an automatic NAND tightening machine according to claim 2, wherein the air guide path is a slit. 4) An automatic NAND duplication prevention device for an automatic NAND tightening machine according to claim 2, wherein the air guide path is a fine hole.