JPH0197576A - Automatic screw driver - Google Patents

Abstract

PURPOSE: To dispense with a claw on a catcher and simplify its structure and prevent a return movement of a screw securely by providing a means to supply compressed air to a screw feed part until a screw is held by the catcher and is adsorbed into an adsorptive pipe. CONSTITUTION: While an air feed means feeds compressed air to a screw feed part 34, the feed part 34 feeds to a catcher 30 a screw 8, which is held inside the tip of the catcher 30 by the compressed air. An adsorptive pipe 27 is then forwarded to close the feed port 34a of the feed part 34. A bit 31 is meanwhile forwarded together with the adsorptive pipe 27 by the forward motion of the peripheral part and rotated by a rotating means so that the screw 8 sucked into the adsorptive pipe 27 is engaged with the bit 31 being rotated and then screwed into an object while still being adsorbed.

Description

[Detailed Description of the Invention] Technical Field> The present invention moves a suction pipe to suction a screw caught by a catcher, and rotates the suctioned screw with a bit to tighten it. Regarding the automatic screw tightening machine.

<Prior Art> Figures 3 and 4 show the structure of a conventional screw tightening machine. In FIG. 3, reference numeral 1 indicates a base, and a pair of support pieces 2.
2 Axis 3 is built in the darkness. Reference numeral 4 denotes a catcher fixed to the distal end side of the shaft 3, which catches screws from a screw supply section (not shown). This catcher 4 has a structure as shown in FIG. That is, 5 is a screw supply port into which a screw from the screw supply section is inserted. 6a, 6b
A chuck portion is rotatably supported by a shaft, and these chuck portions 6a and 6b are urged in the closing direction by springs 7a and 7b. A hole 9 is formed at the tip of the chuck portions 6a, 6b such that the thin portion 83 of the screw 8, that is, the portion below the head 8b, is inserted through the hole 9 when the chuck portions 6a, 6b are closed. By being supplied,
The head 8b side is inside and the thin portion 8a side is inserted into the hole 9 and caught. Reference numeral 10 denotes a return prevention claw provided on the catcher portion 6b. This claw 1o is rotatably supported, and is biased by a hook 11 in a direction in which the tip thereof protrudes between the catcher portions 6a and 6b. The spring 11 is set to have such a biasing force that the claw 1o rotates and passes through the screw 8 due to the force supplied from the supply port 5 to the screw 8.

The mold 10 has a passage width narrower than the head 8b of the screw 8 in a state in which the tip thereof is protruding, so that the screw 8 does not return to the supply port 5 even when the catcher 4 is set upward. 1
2 is a suction pipe also shown in FIG. 3, and this suction pipe 12 is slidably inserted into the catcher 4. As shown in FIG. 3, this suction pipe 12 is supported by a fixed part 13 supported by a shaft 3, and is moved when the fixed part 13 is moved by a cylinder 14. . A bit 15 for applying rotational torque to the screw 8 is inserted into the suction pipe 12 . The bit 15 is movably supported by a cylinder 16 set in the fixed part 13, and is provided with rotation drive means 17 for rotating the bit 15'. An air vent pipe 18 is connected to the suction pipe 12, and the screw 8 is held within the suction pipe 12 by degassing the air within the suction pipe 12.

To explain the operation of the above-mentioned screw tightening machine, first, the screw 8 is fed into the catcher 4 through the supply port 5 along with air by the screw supply section. The screw 8 fed into the catcher 4 from the supply port is pushed aside by the claw 10i by air pressure and force, and the short part is clamped in the hole 9 between the chuck parts 6a and 6b, and the head 8b is caught in the hole 9 between the chuck parts 6a and 6b. 6b, and after being held, the claw lO prevents the screw 8 from moving backwards.

On the other hand, the fixed part 13 is moved by the cylinder 14 at the timing when the screw 8 is supplied, the suction pipe 12 is also moved, and the dot 15 is also moved while rotating. At the same time, air is removed from the air vent pipe 18 and sucked into the suction pipe 15 from the opening side. Therefore, when the suction pipe 12 moves forward while opening the chuck parts 6a and 6b to the left and right until the screw 8 is held, the screw 8 is pulled into the pipe 12 by the suction force of the suction pipe 12, and the screw 8 is pulled forward. +1
5. It will rotate by meshing with the tip.

By further moving the suction pipe 12 forward in this state,
The screw 8 is securely held in the pipe 12 while tightening) 15
It will be rotated and screwed into the object.

However, in the above structure, since the catcher 4 is provided with the claw 10f for preventing return, there is a drawback that the number of parts is large and assembly is complicated. In addition, it is difficult to set the spring force of the spring 11 that biases the claw 10 for preventing return, and it is highly likely that the force of the spring 11 will change in a screw tightening machine that tightens a screw many times. There was a problem in that the reliability of securely holding the screw 8 was low.

<Problem to be solved by the invention> The problem is to eliminate the claws provided on the chuck part, simplify the structure of the Chisek-ja, and make it possible to securely hold the screw when tightening the screw in any direction. .

Means for Solving Problems> Until the screw is caught by the catcher and the suction pipe moves to suction the screw, air continues to be fed into the screw supply reservoir.

While the above air supply continues, the screw is held in the catcher by the air pressure even without the claw, and the screw held by the air pressure is attracted by the suction of the suction pipe and tightened. will be held.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 19 denotes a base on which a pair of support pieces 20 and 21 are provided. 22 is this support piece 20.
A cylinder provided between 21 and 21.
A shaft 23 is connected to the upper side of the second moving shaft 22a. This shaft 23 penetrates and is supported by the support piece 21,
A fixing portion 24 is fixed to the tip of this shaft 23. A cylinder portion 25 that is driven by compressed air is provided within the fixed portion 24 . A spring 26 is provided within the cylinder portion 25 to urge the piston 25ai forward. This cylinder part 25 has a suction pipe 2
The fixing part 28 supporting 7 has been pulled out. This fixing part 28 is formed with a suction part 29 that communicates with the suction pipe 27, so that the air inside the suction pipe 27 can be sucked.

This suction pipe 27 has its tip end penetratingly supported by the other support piece 20, and the catcher 3 fixed to this support piece 20.
It is inserted within 0. Reference numeral 31 denotes a bit inserted into this suction pipe 27, and this bit 31 is connected to a rotation drive section 32 provided inside the fixed section 24. A cylinder 33 is connected to this rotary drive unit 32 so that a cylinder 31 is moved in the axial direction separately from the suction pipe 27. The catcher 30 is provided with a screw supply section 34 and a chuck section (not shown) that opens left and right when the suction pipe 27 is inserted, and this chuck section is biased by a spring in the closing direction. There is. Note that this catcher 30 does not have a claw 10 for preventing return as shown in FIG.

Now, the operation of such a screw tightening machine will be explained.

First, in the initial state, air is introduced into the cylinder 22, the piston is pushed backward, and the fixed part 24 is also located at the rear. Air is also introduced into the cylinder portion 25, and the fixed portion 28 of the suction pipe 27 is also located at the rear against the force of the spring 26 (with the hook 26 contracted). In this state, as shown in FIG. 2, the supply port 34a of the catcher 30 is open.

Here, as shown in Figure 2 (bl), screw 8 with compressed air.
When the screw 8 is sent to the catcher 30, the screw 8 is held inside the tip of the catcher 30.

At this time, the air inside the cylinder 25 is removed at appropriate timing. Then, the piston 25a moves forward due to the action of the spring 26, and as a result, as shown in FIG.
7 moves forward and closes the supply port 34a' with the pipe 27. While this pipe 27 closes the supply port 34a, compressed air continues to be sent to the supply section 34, and the air supply means is controlled so that the screw 8 does not fall even when tightening the screw upward. .

At the same time, the air inside the cylinder 22 is released and the shaft 22a is pulled into the cylinder 22, so that the shaft 23 causes the fixing part 24 to
is pushed forward. At the same time, the suction portion 29 of the suction pipe 27 is degassed, and a suction force is generated at the tip of the suction pipe 27.

As the fixed part 24 moves forward, the bit 31 also moves forward together with the suction pipe 27 1, and the rotational drive means 32
It rotates. The screw 8 sucked into the suction pipe 27 engages with the rotating bit 31 and is screwed into the object while being sucked as shown in FIG. 2 tdl.

In such a screw tightening machine, the suction pipe 27 is connected to the supply port 3.
Since the compressed air continues to be fed until the catcher 4a'z is closed, there is no need to provide a claw for preventing return to the catcher 30, and the inconvenience caused by providing this claw can be eliminated.

Also, since the cylinder part 25 is provided within the fixed part 24,
The suction pipe 27 moves at the speed of the cylinder section 25 in addition to the speed of the cylinder 22, increasing the moving speed of the suction pipe and reliably preventing the screw from returning. 22 is shortened and housed between the support pieces 20 and 21, resulting in cylinder 2
2 on the outside of the support piece 21, the overall length of the device can be made shorter. What you can do by knowing the entire length of the device is:
This is effective in expanding the flexibility of the installation location of the screw tightening machine.

Effect> According to the above invention, the structure of the catcher can be simplified by omitting the claw provided on the catcher, and
There is no change over time and it is possible to reliably prevent screws from returning.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an uninvented embodiment, FIG. 2 is an explanatory view of the operation on the same side, FIG. 3 is a sectional view of a conventional device, and FIG. 4 is an enlarged view of the main parts of the same device. 8: Screw, 22 Niji cylinder, 25 Niji cylinder part, 26 Two springs, 27: Adsorption pipe, 29: Suction part, 30: Catcher, 31: Bit, 32: Rotation drive part, 34: Screw supply part.

Claims (1)

[Claims] 1. A catcher that catches the screw from the screw supply section through the supply port, a suction pipe that sucks and holds the screw caught by the catcher, and a suction pipe that is inserted into the suction pipe and has its own suction pipe. It consists of a bit that rotates the screw by rotation, a driving means for moving the suction pipe in the axial direction, and a driving means for moving the bit in the axial direction while rotating, and the screw is a catcher and a catcher. An automatic screw tightening machine that continues to supply air to supply screws until the suction pipe moves and suctions the screws.