JPH026998Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a screw tightening device for tightening screws at a predetermined work position.

Conventionally, as shown in FIG. 4, a screw tightening device has a fixed motor 31 and a cylinder 3 which is the main lifting source.
Driver stand 5 arranged to move by 0
and a chuck stand 16 to which is fixed a chuck body 13 for guiding the driver bit 11 which rotates in response to the rotation of the motor 31. Further, this chuck stand 16 is arranged so as to be movable together with the driver stand 5 or movably with the driver stand 5 alone. Moreover, a spring 32 is arranged between the driver stand 5 and the chuck stand 16, so that after the chuck stand 16 stops at a predetermined position, the driver stand 5 is lowered by itself and the driver bit 11 is moved to the chuck stand. It is configured to descend relative to the
Further, a chuck main body 13 is fixed to the chuck base 16, and a pair of chuck claws 17 are arranged on the chuck main body 13 with their tips urged in a closing direction. The chuck pawl 17 is configured to hold a screw supplied from a screw supply device (not shown) and to be able to remove the screw as the driver bit 11 moves.

This screw tightening device is equipped with a duplication prevention device for preventing duplication of screws within the chuck body 13. This anti-duplication device has an auxiliary cylinder 15 fixed to a bracket 33, the rod 15
A stopper 34 is arranged at the tip of a. Furthermore, this duplication prevention device is configured such that after the chuck base 16 has been lowered to the stopper 34, the auxiliary cylinder 15 is activated, the chuck base 16 is raised relative to the driver bit 11, and the screw inside the chuck body 13 is ejected. It is configured. In this screw tightening device, since the stopping position of the chuck base 16 is regulated by the stopper 34 located at a predetermined position, it is possible to prevent the screws from overlapping inside the chuck body 13 without any problem.
When the stopping position of the chuck stand 16 is set to the surface of the object to be fastened, as in the case where the stopping position of the chuck stand 16 is regulated by a stop plate (not shown) fixed to the Because the stopping position was not constant, it was not possible to install the above-mentioned duplication prevention device. Therefore, the screws remaining in the chuck body 13 cannot be ejected, leading to the duplication of screws in the chuck body 13. A tightening device is required.

The present invention was created based on the above-mentioned request, and examples thereof will be described below with reference to the drawings. In FIGS. 1 to 3, 1 is a screw tightening device attached to a conveyor line (not shown);
It has a support bracket 2 fixed to the base of the conveyor line. A rodless cylinder 3 as a reciprocating drive source extending horizontally is fixed to the support bracket 2, and a driver stand 5, which will be described later, is fixed to the slider 4 via a connecting plate 6. On the other hand, two guide shafts 7 are fixed to the support bracket 2 so as to be positioned parallel to the rodless cylinder 3, and a driver stand 5 is arranged on the guide shafts 7 so as to be able to move forward and backward. .

A transmission shaft 9 is rotatably disposed on the driver stand 5, and a driver bit 11 is connected to the transmission shaft 9 via a connecting shaft 10 so as to rotate together with the transmission shaft 9.

A rotary drive source 19 is fixed to the driver stand 5 via a fixture 20 so as to extend in a direction perpendicular to the transmission shaft 9. A drive bevel gear 24 is connected to the drive shaft 21 of the rotational drive source 19 via a coupling 22 and a clutch mechanism 23, and the drive bevel gear 24 is connected to a driven bevel gear 25 fixed to the transmission shaft 9. are arranged so that they mesh.

On the other hand, the driver stand 5 has a connecting shaft guide 12.
is fixed thereto, and a guide sleeve 14 fixed to a chuck body 13, which will be described later, is arranged at one end so as to be freely inserted. Moreover, the driver stand 5
An auxiliary cylinder 15 having a smaller diameter than the rodless cylinder 3 and having a pressing force smaller than that of the rodless cylinder 3 is fixed to the rodless cylinder 3, and the rod 15a is configured to be always extended and positioned. has been done. Moreover, this rod 15
A chuck stand 16 that can move forward and backward in the same direction as the driver stand 5 along the guide shaft 7 is fixed to a, and the chuck stand 16 is configured to be positioned at a predetermined distance from the driver stand 5. has been done. Further, a chuck main body 13 is fixed to the chuck base 16, and a pair of chuck pawls 17 located on the travel path of the driver bit 11 and capable of opening and closing the chuck main body 13 bias the tip in the direction of closing. The chuck claw 17 is configured to be pushed open when the driver bit 11 is inserted. The chuck pawl 17 has a screw holding hole 26 that communicates with the screw supply hole 18 bored in the chuck body 13, so that a screw (not shown) supplied through the screw supply hole 18 is held. It is configured. Moreover, the chuck body 13
The driver bit 11 is arranged so as to be freely inserted therein, and a guide sleeve 14 is fixed so as to surround the driver bit 11. After the chuck stand 16 is stopped at a predetermined position, the guide sleeve 14 is inserted. It is configured to be housed within the articulating shaft guide 12. Further, a contact plate 27 is fixed to the chuck main body 13, and the tip of the contact plate 27 is positioned to protrude in front of the driver bit 11, and a notch (not shown) is provided at a position corresponding to the driver bit. It is configured such that the screw held by the chuck pawl 17 can pass therethrough.

In the screw tightening device described above, when the object to be fastened moving on the conveyor line stops on a predetermined work station, the rodless cylinder 3 is operated and the driver stand 5 is moved horizontally relative to the object to be fastened. Along with this, the rotary drive source 19 also moves, and the desk 16 also moves together. The contact plate 27 fixed to the chuck body 13 comes into contact with the object to be fastened, and the chuck base 16 stops at a predetermined position, while when the slider 4 of the rodless cylinder 3 moves further, the pressing force of the auxiliary cylinder 15 is counteracted. Then, the driver stand 5 moves. Therefore, the driver bit 11 moves within the chuck body 13, detaches the screw held by the chuck pawl 17 from the chuck pawl 17, and screws it into the object to be fastened.

After the screw tightening is completed, the rodless cylinder 3 moves back and at the same time the rod 15a of the auxiliary cylinder 15 retreats, and the chuck stand 16 returns earlier than the driver bit 11. Therefore, driver bit 1
1 will surely protrude from the chuck claw 17 during return,
If there are any screws remaining in the chuck pawl 17, remove them. Thereafter, the rod 15a of the auxiliary cylinder 15 also moves back and all work is completed.

As explained above, the present invention combines the driver stand to which the rotary drive source is fixed, the chuck stand on which the chuck claws are arranged for guiding the driver bit and holding the screws, and the diameter of the reciprocating drive source for raising and lowering the driver stand. The rod of this auxiliary cylinder is connected by an auxiliary cylinder whose pressing force is smaller than that of the auxiliary cylinder, and the rod of this auxiliary cylinder is in an extended state. Since the rod is configured to move backward, even if the reciprocating drive source descends faster than the screw descends during screw tightening, the rod of the auxiliary cylinder can be forcibly moved backwards, and the screw can be tightened without any problem. Not only can the cylinder be operated even when the stopping position of the chuck stand is regulated by the fixed contact plate of the chuck body and the flat surface of the object to be fastened, and the stopping position of the chuck stand is not constant. By doing so, it is possible to reliably protrude the driver bit from the chuck body, prevent screws from remaining inside the chuck body, and provide an extremely versatile screw tightening device that can prevent screws from overlapping under any conditions. There are advantages such as

[Brief explanation of the drawing]

Fig. 1 is an overall explanatory diagram of the present invention, Fig. 2 is a sectional view of the main part of Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 shows a conventional example. It is a front view. 1...Screw tightening device, 2...Support bracket,
3...Rotless cylinder, 4...Slider, 5
... Driver stand, 6 ... Connection plate, 7 ... Guide shaft, 8, 9 ... Transmission shaft, 10 ... Connection shaft, 1
1...Driver bit, 12...Connection shaft guide,
13...Chuck body, 14...Guide sleeve, 15...Auxiliary cylinder, 15a...Rod,
16...Chick stand, 17...Chick claw, 18
...Screw supply hole, 19...Rotary drive source, 20...
Fixture, 21... Drive shaft, 22... Connection shaft, 23
...Clutch mechanism, 24...Drive bevel gear, 25...
... Driven bevel gear, 26 ... Screw holding hole, 27 ... Hit plate, 28 ... Cylinder, 30 ... Cylinder, 3
1...Motor, 32...Spring, 33...Bracket, 34...Stopper.

Claims (1)

[Scope of utility model registration request] A driver stand 5 to which a rotary drive source 3 for transmitting rotation to the driver bit 11 is fixed is configured to be movable forward and backward by the reciprocating drive source 3, and a chuck stand 16 is arranged so as to be movable forward and backward in the same direction as the driver stand 5. A chuck main body 13 having a pair of chuck claws 17 positioned on the travel path of the driver bit 11 and urged to close the tip is fixed to the chuck base 16, and the driver bit 11 is held by the chuck claws 17. While pushing it open and guiding it movably, the driver stand 5 and the chuck stand 16 are connected by an auxiliary cylinder 15 which has a smaller diameter than the reciprocating drive source 3 and has a smaller pressing force, and the rod 15a of this auxiliary cylinder 15 is constantly held. A screw tightening device characterized in that it is extended to provide a predetermined distance between a driver stand 5 and a chuck stand 16.