JPS59110570A - Automatic nut clamping machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic nut tightening machine having a collet chuck type socket box provided at the tip of a rotary drive shaft for holding and tightening nuts.

The conventional automatic nut tightening machine has a rotary drive shaft provided via a drive section 2 connected to a drive source 1, as shown in FIGS. 1 to 3. The socket box 4 is attached to the tip of the nut 3 and has a hole 4a of the same shape as the nut, and the catcher γa, 7b holds the nut 6 that is fed through the hose 5 having a square hole. 6 was fitted into the hole 4a of the socket box 4 and the nut was tightened.

In such stratification, the nut 6 that is force-fed through the hose 6 is bounced off by the force-feeding, and the catcher 7a
, yb may not be held in the correct position.Cylinder 8. as shown in FIG. Lever 9. A function for correcting the holding position using the pusher 10 or the like was required. Also, at the initial stage of tightening the nut, catchers 7a and 7b
If the nut 6 held in the socket box 4 is not properly engaged with the socket box 4 due to circular movement, and the axes of the nut 6 and bolt 11 do not match after being engaged with the socket box 4, the nut 6 The biting of the bolt 6 into the bolt 11 becomes unstable, resulting in damage to the threaded portion. Furthermore, as shown in FIG. 3, catchers 7a and 7b are installed at the position where the nut 6 comes into contact with the tip of the bolt 11 to prevent the nut 6 from falling off.
catcher 7 has to open.
There was a problem that there was a large limit on the tightening space VC as the opening margin for a and 7b.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and provides stable nut tightening and easy nut tightening in narrow spaces, and simplifies the structure.

Composition of the Invention The present invention provides a collet chuck type socket box that is attached to the tip of a rotational drive shaft connected to a rotational drive source via a drive transmission unit, and that includes a collet and a sleeve that have a hole having the same shape as a nut; An opening/closing device is provided at the other end of the rotation drive shaft to open and close the collet chuck along the axial direction, and when tightening the nut, there is a discrepancy between the nut tightening speed and the moving speed of the collet chuck type socket box. It is equipped with a compression spring that absorbs moisture and allows for smooth nut tightening.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 4 to 6. In the figure, 12 is a rotational drive source, and 13 is a rotational drive shaft. 14 is a main gear provided on the rotational drive source 12, 16 is a driven gear provided on the rotational drive shaft 13 and receives rotational torque, and 16 is an intermediate gear that transmits the rotational torque from the main gear 14 to the driven gear 16. . 17a,
17b.

17c is a bearing that receives the rotation and sliding of the rotary drive shaft 13. 1B is a housing that supports the bearings 17a and 17b. 19 is a collet that is attached to the tip of the rotary drive shaft 13 and has a hole having the same shape as a nut; 20/fi is a sleeve provided around the outer periphery of the collet 19; A shaft 21 is connected to the sleeve 20 via a pin 22. A compression spring 23 is wound around the outer periphery of the rotary drive shaft 13 to absorb the discrepancy between the nut tightening speed and the moving speed of the rotary drive shaft 13 when the nut is tightened. 24 is the rotary drive shaft 1
In the direction of the axis of 3? P1 is an air cylinder that moves up and down to open and close the collet chuck, and is connected to the rotational drive shaft 13.
A shaft 21 inserted therein is connected. 26 is a block that fixes the cylinder 24f via a bracket 26, and is provided with a rotation prevention rod 27 for the air cylinder 24. 28 is the air cylinder 2 due to the air being cut off.
4 is in the open state, the shaft 21. When the collet 19 opens via the pin 22 and the sleeve 20 and holds the nut 29, this is a compression spring that applies a force to the sleeve 20 to hold the nut 29 so that it does not fall off. 30.31 uses a vibrating parts feeder to fully align and feed the nuts.

A supply device 32 is provided at a certain distance from the collet 19 and delivers the nut 29 to the collet 19, and is provided at the tip of the vibrating parts feeder 31. Reference numeral 33 denotes an air cylinder provided so that the feeding device 32 can reciprocate between the collet 19 and the vibrating parts feeder 30 for delivering nuts. 34 is a bracket on which the nut tightening unit A is mounted, and a bearing bracket 36
It is connected to the air cylinder 36 via.

In the automatic nut tightening machine configured as above,
Its operation will be described next. The nuts placed in the hopper of the vibrating parts feeder 30 are sequentially arranged and delivered from the vibrating parts feeder 30 via the vibrating parts feeder 31 to the feeding device 32. Then, when the nuts are separated and held one by one by the feeding device, the air cylinder 33 is activated, and the feeding device 32 is moved directly below the collet 19 as shown by the one-point helix in FIG. Insert the nut 29 into the hole provided in the collet 19. colette 1
When the nut 29 is inserted into the shaft 21.9, the air cylinder 24 is activated and the shaft 21. The collet 19 is closed via the pin 22 and the sleeve 2o, and the nut 29 is held as shown in FIG. When the nut 29 is held by the collet 19,
The air cylinder 33 is operated again and the supply device 32 returns to its original position. Then, the air cylinder 36 and the rotational drive source 12 are activated. When the rotational drive source 12 is activated, the rotational drive shaft 13 and collet 19 rotate. Due to the operation of the air cylinder 36, the nut 29 held by the collet 19 rotates and descends, approaching and abutting the bolt 37 to tighten the nut.

FIG. 6 shows a state in which the nut is tightened, and shows a state in which the compression spring 23 is compressed to absorb the discrepancy between the moving speed of the tightening part /f and the rotational drive shaft 13 and collet 19 when the nut is tightened. There is. The compression spring 23 has the function of absorbing speed discrepancies and also has the function of adjusting the load on the threaded portions of the nut 29 and bolt 37.

When the nut tightening is completed, the air cylinder 24 is activated again, the collet 19 is opened, and the nut 29 is released from being held. Then, the air cylinder 36 is operated and raised to return to the state shown in FIG.

As described above, by using the collet chuck type socket box, it is possible to narrow the space of the tightening part which is subject to restrictions, and stable tightening of the Nand can be achieved by adjusting the speed or load when tightening the Nand.

In addition, in this example, the nut tightening unit is fixed and the nut supplying device moves reciprocatingly, but the nut supplying device is fixed and the NAND tightening unit is fixed to the XY table for several times. This allows flexibility in the tightening position.

Effects of the Invention As described above, since the present invention includes a collet chuck type socket box provided on the rotational drive shaft, it is possible to perform NAND tightening in a tightening part with a narrow space. In addition, in order to securely hold the nut with the collet, it is possible to match the axes of the nut and bolt, and furthermore, the tightening speed can be adjusted using a compression spring or the tightening load can be adjusted to ensure a stable circular side. Can be tightened with nuts.

Furthermore, by providing the opening/closing device for the collet chuck along the axial direction of the rotary drive shaft, and by providing the mata nut supply device at a certain distance from the collet chuck, the mechanical structure can be simplified. .

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional nut tightening machine, Fig. 2 is an enlarged sectional view taken along line A-A in Fig. 1, Fig. 3 is an enlarged sectional view of the nut tightening machine, and Fig. 4 is an enlarged sectional view of the same nut tightening machine. FIG. 5 is an enlarged sectional view of the main parts of the nut tightening machine when holding the nut, and FIG. 6 is an enlarged sectional view of the same nut tightening machine when tightening the nut. 12... Drive source, 13... Rotation drive shaft,
14゜15.16...Gear, 19...
Collet, 20...Sleeve, 21...
・Shaft, 23.28... Compression spring, 24...
...Airlinder (opening/closing device), 33.36...
...Air cylinder, 30.31...Vibrating parts feeder, 32...Feeding device. Name of agent: Patent attorney Toshio Nakao and one other person - Figure 2, Figure 3'' 1

Claims (1)

[Claims] A collet chuck type socket box consisting of a collet and a sleeve for holding a nut is attached to the tip of a rotary drive shaft connected to a rotation drive source via a drive transmission part, and a collet chuck type socket box is attached to the other end of the rotary drive shaft. An opening/closing mechanism is provided to open and close the collet chuck that moves along the axial direction, and an opening/closing mechanism is provided at a certain distance from the axis of the collet and is capable of transferring and holding the nut in the collet chuck.
A nut feeding device having a nut transfer section provided as shown in FIG. Automatic nut tightener with spring.