JPH0215330B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention is an automatic screw tightening machine that is capable of efficiently performing two types of screw tightening operations with different head outer diameters at one station. This relates to a screw supply device in a machine.

(Conventional disadvantages) Conventionally, in various assembly processes, when using an automatic screw tightening machine to fasten two types of screws with different head diameters, it is necessary to use a screw that corresponds to the head diameter of each screw. Since a single-function screw tightening machine with a supply device was installed at each station, there were drawbacks such as poor space efficiency and increased equipment costs, resulting in a lack of versatility.

(Problems to be Solved by the Present Invention) The present invention has been made to solve the above-mentioned conventional drawbacks. Two types of screws with different head outer diameters are sucked by a screw suction pipe of the same shape. The present invention provides a screw supply device for an automatic screw tightening machine, which is configured to sequentially feed screws into the screw suction pipe from a screw supply device corresponding to the outer diameter of the head of the screw.

(Configuration of Embodiment) Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a sectional view of a screw supply device showing an embodiment according to the present invention, and FIG. 2 is a perspective view showing the main parts of FIG. It's a pipe. The outer pipe 1 is attached to the tip of the inner pipe 2 via a spring 3 so as to be slidable up and down, and a suction pipe 4 for vacuum air is connected to an appropriate position of the inner pipe 2.
Further, a driver 6 which is rotationally driven by a motor 5 is inserted into the inner pipe 2 so as to be able to slide up and down, and screws 7a or 7b transferred to the lower surface of the outer pipe 1 are driven by vacuum air. The driver 6 descends together with the inner pipe 2 and grips it while suctioning.

Furthermore, the outer pipe 1 is positioned by a takeout port 8a provided in the center of a screw supply table 8 to grip a screw 7a or 7b. Two types of screws 7a and 7b with different
Shutters 9a and 9b that supply the air are installed in shutter mounting portions 9c and 9d.

Catching arms 10a and 10b are rotatably provided on the lower surfaces of the shutter openings 9e and 9f, respectively, via cylinders 11a and 11b, and screws 7a and 7b supplied from the shutters 9a and 9b are attached. is catching arm 1
0a or 10b, and is transferred directly below the outer pipe 1 by the operation of the cylinder 11a or 11b.

(Operation of the embodiment) Next, the operation of the screw supply device configured as described above will be explained.

First, as shown in FIGS. 3a, b, and c, the suction and tightening work for a screw with a small outer diameter head is carried out by moving the screw 7b supplied by the catching arm 10a to a predetermined position, and Outer pipe 1
When the is lowered and positioned, the driver 6 and inner pipe 2 are lowered against the spring 3,
The tip of the driver 6 bites into the screw 7b, is gripped by vacuum air, and the outer pipe 1
Together, they rise together and are transferred to a desired tightening position, thereby tightening the assembly A. At this time, screw 7
The head of screw 7b is held by the inner diameter of the tip of the inner pipe 2, so even during tightening work, the head of screw 7b is restricted by the tip of the inner pipe 2, so there is no possibility of misalignment. The rate of defective tightening is reduced.

In addition, the suction and tightening work for screws with large head diameters is as shown in Figure 4 a, b, and c.
The head of the screw 7a is regulated by the inner diameter of the outer pipe 1 to prevent misalignment, and the rate of defective tightening is reduced.

(Effects of the Invention) As explained above, according to the screw supply device according to the present invention, two types of screws with different head outer diameters can be sucked and attracted at the coaxial center, and the screws can be sucked and attached to each other during installation and assembly. Work efficiency is improved because screws of different dimensions do not cause misalignment. Furthermore, since two types of screws with different head diameters can be supplied from the same station, space utilization efficiency is improved and equipment costs such as X-Y tables and robots are reduced.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a screw supply device showing an embodiment of the present invention, Fig. 2 is a perspective view showing the main parts of Fig. 1, Fig. 3 a, b, c, and Fig. 4 a, b, c.
FIG. 2 is an explanatory diagram showing the operating state of main parts according to the present invention. 1... Outer pipe, 2... Inner pipe, 4... Suction pipe, 6... Driver, 7
a, 7b...screw, 9a, 9b...shaft, 9
c, 9d... Shooter mounting portion, 9e, 9f... Shooter opening, 10a, 10b... Catching arm.

Claims (1)

[Claims] 1 Automatic screw tightening consisting of an inner pipe attached so as to be slidable up and down, an outer pipe attached to the outside of the inner pipe so as to be able to slide up and down, and a driver inserted into the inner pipe so as to be able to rotate and slide up and down. A supply table that has an attachment part for two shooters that supply two types of screws with different sizes of outer diameters of the machine and the head, and has a screw extraction hole provided to position the outer pipe; It consists of a catching arm that is installed to be able to be transferred freely between the lower part of the screw extraction hole of the supply table and the lower part of the shooter opening, and the screws supplied from the shooter are received by the catching arm and transferred to the automatic screws. When using a tightening machine, when the outside diameter of the screw head is small, the position of the outside diameter of the screw head is controlled by the inside diameter of the inner pipe, and when the outside diameter of the screw head is large, the outside diameter of the screw head is controlled by the outside diameter of the outer pipe. 1. A screw supply device for an automatic screw tightening machine, characterized in that the screw supply device is configured to grip the outer diameter of the screw head by positionally regulating the outer diameter of the screw head.