JPH0451294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a screw tightening system that enables multiple types of screw tightening with one automatic screw tightening machine by automatically replacing a suction pipe that captures screws. This invention relates to an automatic screw tightening machine that allows point positions to be set arbitrarily.

Structure of the conventional example and its problems A conventional automatic screw tightening machine is composed of a screw tightening head section 1, an XY table section 2, and an electric control box 3, as shown in a specific example in Fig. 1. By arranging a plurality of screws for each type of screw, the type of screw can be switched. This configuration has problems in that the installation area is large and the machine price is also high.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and enables easy switching of screw types using one automatic screw tightening machine.

Composition of the Invention The present invention provides an automatic screw tightening machine that is equipped with a suction pipe that captures screws from a plurality of screw supply units that align and separate multiple types of screws, and that can arbitrarily set the position of a tightening point; It is an extremely advantageous device that is composed of a replacement device for replacing a pipe with another suction pipe, which simplifies the structure, and allows a single screw tightening machine to tighten multiple types of screws.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 8. In the figure, 4 and 4' are screw supply parts, and the screws fed into the hopper 5 are fed and aligned onto the chute 7 by a swingable scoop plate 6, and are fed and aligned on the chute 7 by an escapement 8 provided at the tip. The screw is separated into one piece.

Reference numeral 9 denotes a positioning table section, and screw tightening points can be arbitrarily set by a program in the electric control box 10.

A screw tightening head section 11 is mounted on the tip of the positioning table section 9, and performs screw tightening work according to commands from the electric control box 10.

The structure of the screw tightening head 11 will be described. 12 is a driver holder, frame 13
It can be moved up and down using a guide shaft 14 fixed to the frame 13 as a guide.

The rotational force for screw tightening is determined by the screwdriver holder 12.
The power is transmitted from an electric screwdriver 16 attached to a rotary shaft system 17 to a bit 18 .

Reference numeral 19 denotes a vacuum pipe, which has a hole at its tip for holding a steel ball 20, and is connected to a slidable sleeve 21 with a tapered surface so as to push the steel ball 20 inside. A spring 22 is attached to bias the spring 22.

At the upper end of the vacuum pipe 19, there is an L pipe connected to a vacuum source that generates a vacuum such as a vacuum pump (not shown).
A shaped pipe 23 is connected and communicates with the vacuum pipe 19 and the hollow part of the suction pipe 24, which captures the screw by vacuum force.

The suction pipe 24 is caused by the steel ball 20,
It is detachably held by the vacuum pipe 19.

Next, the exchanging device 25 for the suction pipe 24 will be described.

A jig cylinder 26 is connected to a claw 27 that presses the collar of the suction pipe 24.

Block 28 connects suction pipes 24 and 24'
It has two receiving holes 29 and guides the sliding movement of the pawl 27. 30 is an object to be fastened. 3
Reference numeral 1 denotes a frame to which a screw supply section 4, a positioning table 9, and an exchange device 25 are attached.

Next, the operation of the above configuration will be explained in order. In response to the activation signal, the positioning table section 9 moves directly above the screw that has been separated in advance by the screw supply section 4, and after the positioning is completed, the suction pipe 24 is lowered to the position of the escapement 8 by the operation of the air cylinder 15, and the screw is vacuumed. Capture with force. Next, when the air cylinder 15 contracts and returns to the upper limit, the screw supply section 4 operates and separates the next screw, and at the same time the positioning table section 9 starts moving, and the tightened object 3
Then, the air cylinder 15 is activated, the screwdriver holder 12 is lowered, and the electric screwdriver 16 also starts rotating, rotating the bit 18 via the rotating shaft system 17. The suction pipe 24 is stopped from descending by coming into contact with the object 30 to be tightened.

As the air cylinder 15 continues to expand,
The bit 18 screws in the screw while descending inside the suction pipe 24, and when a certain torque is reached, the electric screwdriver 16 issues a completion signal. This signal causes the air cylinder 15 to contract, and the electric screwdriver 16 and suction pipe 24 to return to their original positions. By repeating this series of operations, one type of screw tightening work is completed.

Next, when switching the screw type, the positioning table section 9 is inserted into the hole 2 of the block 28 of the changing device 25.
9, the air cylinder 15 is activated, the suction pipe 24 is lowered and inserted into the hole 29, the jig cylinder 26 is activated, the claw 27 moves forward, and the suction pipe 24 is inserted into the hole 29. Hold the saliva.

Next, the air cylinder 15 is deflated, and the suction pipe 24 is prevented from rising by the pawl 27 and left in the hole 29 of the block 28.

The positioning table part 9 is located in the hole 2 of the block 28.
At the same time as moving directly above 9', the jig cylinder 26 contracts and the claws 27 return to their original positions. Next, the air cylinder 15 is lowered, and the vacuum pipe 19 is inserted into the new suction pipe 24', which has been previously installed in the hole 29' of the block 28.
It is held by a steel ball 20. Next, as the air cylinder 15 contracts, a new suction pipe 2 is created.
4' is held by the vacuum pipe 19 and rises. With the above operations, the replacement of the suction pipes 24 and 24' is completed.

Next, the positioning table section moves to a position directly above the screw of another screw supply section 4', and after the positioning is completed, the suction pipe 24' is moved by the operation of the air cylinder 15.
descends to the position of the escapement 8', captures the screw, and the air cylinder 15 contracts,
The positioning table 9 moves to the next screw tightening position and starts screw tightening work.

Effects of the Invention As is clear from the description of the embodiments above, the present invention includes a plurality of screw supply units and a suction pipe that captures screws from the screw supply units, and the position of the tightening point can be arbitrarily set. An automatic screw tightening machine that can
Since it is composed of a replacement device that replaces the suction pipe with another suction pipe, it is possible to tighten multiple types of screws with one automatic screw tightening machine, reducing the installation area and simplifying the configuration. It is an advantageous device.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional automatic screw tightening machine, Figure 2 is a perspective view of a conventional automatic screw tightening machine.
The figure is a plan view of the entire automatic screw tightening machine according to an embodiment of the present invention. Fig. 3 is a front view of the same, Fig. 4 is a sectional view of the screw supply section, Fig. 5 is a partial sectional view of the screw tightening head, Fig. 6 is a plan view of the suction pipe exchange device, and Fig. 7 is a sectional view of the screw supply section. FIG. 8 is a side sectional view of the same with the suction pipe being attached and detached. 4, 4'... Screw supply section, 9... Positioning table section, 10... Electric control box, 11... Screw tightening head section, 24, 24'... Suction pipe, 25...
...Automatic exchange device.

Claims (1)

[Claims] 1. An automatic screw tightening machine equipped with multiple screw supply units that align and separate multiple types of screws, a suction pipe that captures screws from the screw supply units, and an exchange that replaces the suction pipe with another suction pipe. An automatic screw tightening machine consisting of a device.