JPH0333393Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is attached to a screw supply device, more specifically an automatic screw tightening machine, and the screw shaft of the supplied screw is aligned with the axis of the bit of this automatic screw tightening machine. This invention relates to a screw feeding device that can feed screws in accordance with the following.

[Conventional technology]

Most of FIG. 1 for explaining the embodiment of this invention can be used as is to explain the conventional technique, but the conventional technique will be explained with reference to FIG.

In Fig. 1, the screw supply device 1 has a chute 1.
1 is provided, and the object of supply, for example, a SECOM screw 2, is conveyed on this chute 11, and an individual supply device 1212 includes two escape rods 12A and 12B that alternately advance and retreat from the side wall of this chute 11. One by one, the pieces are sent toward a receiving pedestal 3 located at the end of the chute.

If we explain SECOM screw 2 here, this is the third
As shown in the figure, a flat washer 22 and a spring washer 23 are preset on a screw 21 in a predetermined relationship.

As shown in FIG. 4, the conventional pedestal 103 has a threaded bearing hole 10 having a cylindrical concave surface corresponding to a half circumference.
3A and a flat washer receiving surface 103B provided around the upper part of this screw bearing hole 103A, and is a type of block body that is equipped with a flat washer receiving surface 103B provided around the upper part of this screw bearing hole 103A. The washer 22 is received so as to be placed on this flat washer receiving surface 103B, and the bit 5 of the automatic screw tightening machine 5 is
It will have a descent of 2.

[Problem to be solved]

However, since the SECOM screw 2 is assembled by passing the spring washer 23 through the screw shaft in advance, the flat washer 2
If the screw 21 is guided with its lower surface aligned with the horizontal plane XX, the axis of the screw 21 will be inclined with respect to the vertical line YY. In other words, the lower surface of the flat washer 22
3, there is no guarantee that the axis of the screw 21 will match the axis of the bit 52 of the automatic screw tightening machine 5, and the bit 52 will not engage with the Phillips hole at the upper end of the screw 21. There is a risk that the screws may be lost, and the operation of the automatic screw tightening machine becomes uncertain.

[Means for solving problems]

This invention was made in order to solve the above-mentioned problem, and includes a pedestal provided at the end of the chute and provided with a threaded bearing surface forming a semicircular cylindrical concave surface; The present invention provides a screw feeding device characterized by having a pair of push rods that are movable forward and backward relative to the screw feeder and have a pressing slope at the tip thereof.

[Effect]

If the sent SECOM screw is guided by the screw bearing surface of the cradle and the screw shaft of the SECOM screw is pressed against this screw bearing surface by the push rod, the screw shaft will be accurately aligned with the axis of the screw bearing surface. Since it takes the coaxial position with the screw bearing surface of the pedestal, if you arrange it in advance so that the screw bearing surface of the pedestal matches the axis of the bit of the automatic screw driver, the screw axis of the sent SECOM screw can be aligned with the axis of the bit of the automatic screw driver. It can be supplied exactly coaxially with the axis.

〔Example〕

An embodiment of this invention will be described with reference to FIGS. 1 and 2.

A portion of the explanation regarding FIG. 1 has already been explained in connection with the prior art, so the explanation will be omitted.

At the end of the chute 11, a cradle 3 of this invention is arranged as will be described later. As shown in FIG. 2, the pedestal 3 of this invention includes two pedestal blocks 3A, each having a cylindrical concave surface corresponding to a quarter of the circumference.
3B, these are semicircular cylindrical concave surfaces having the same curvature as the shaft portion of the screw 21.
1 and also form a flat washer receiving surface (see FIG. 3) for supporting the spring washer 23 and flat washer 22 set on the screw 2.

A pair of push rods 4, 4 that move forward and backward in one diametrical direction are provided with respect to the screw bearing surface 31 of the pedestal 3, and a pressing slope 41 is formed at the tip of the push rod 4. The positional relationship between the pressing slope 41 and the screw bearing surface 31 is as shown in FIG.
faces the screw bearing surface 31, and the shaft portion of the screw 21 is held under pressure between the screw bearing surfaces 31, 31 and the two pressing slopes 41, 41. In other words, the SECOM screw 2 sent out from the chute 11 is in a state where the spring washer 23 and the flat washer 22 are supported on the flat washer receiving surface (not shown), and then each of the push rods 4, which had been retracted, moves forward. As a result, the shaft portion of the screw 21 is held under pressure while being guided in a certain direction by the pressing slopes 41, 41 and the screw bearing surface 31. With this configuration, the screw 21 that is held under pressure is fixedly held at a position where the axis of the shaft portion is parallel to the central axis of the cylindrical concave surface of the screw bearing surface 31.

Therefore, in the automatic screw tightening machine 5, the axes of the vacuum suction tube 51 that can be raised and lowered and the bit 52 that is disposed inside the vacuum suction tube 51 that can be raised and lowered in the vertical direction as shown in FIG. arranged to match.

〔effect〕

According to this invention, the sent SECOM screw is guided by the screw bearing surface of the pedestal, and the screw shaft of the screw is pressed against this screw bearing surface by the push rod, so that it is accurately aligned with the axis of the screw bearing surface. Since it takes a coaxial position, if you arrange the screw bearing surface of the pedestal in advance so that it matches the axis of the bit of the automatic screwdriver, you can align the screw shaft of the sent SECOM screw with the axis of the bit of the automatic screwdriver. This has the effect of being able to supply it precisely coaxially.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of this invention.
FIG. 2 is a sectional view taken along the - line in FIG. 1, FIG. 3 is an enlarged side view showing a SECOM screw, and FIG. 4 is a perspective view showing a conventional cradle. 1... Screw supply device, 2... SECOM screw, 21
...Screw, 22...Flat washer, 3...Case, 31
...Screw bearing surface, 4...Push rod, 41...Press slope.

Claims (1)

[Claims for Utility Model Registration] A screw bearing surface is disposed at the end of the chute, has the same curvature as the shaft of the screw, and has a semicircular cylindrical concave surface, and the upper part of the screw bearing surface. The cradle has a flat washer receiving surface that supports the spring washer set on the screw, and the pressing slope cooperates with the screw bearing surface to clamp and hold the shaft of the screw supported by the cradle. A screw feeding device comprising: a pair of push rods that are movable in the diameter direction of the cylindrical concave surface with respect to the base and are provided on the side facing the screw bearing surface at the tip end thereof.