JPH0610938A - Spacer for screws - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a spacer for a screw, which has a simple structure of a robot hand and which can shorten an assembling time. [Structure] A spacer made of synthetic resin having a hole 11 into which a screw is inserted, characterized in that a protrusion 12 for engaging with the screw is provided on an inner surface of the hole 11.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a spacer for screws. More specifically, the present invention relates to a screw spacer used in automatic assembly of products, and more particularly to a screw spacer that can be temporarily fixed to a screw.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional screw spacer.

In FIG. 1, reference numeral 1 is a screw spacer having a hole 1a into which a screw 2 is inserted. The inner diameter of the hole 1a is larger than the outer diameter of the screw 2 with a margin.

In the case of automatically assembling a product using such a screw spacer, conventionally, the spacer and the screw are separately supplied to the semi-finished product being assembled by a robot hand.

For example, as shown in FIG. 5, when the transformer 4 is attached to the frame 3 of the semi-finished product (workpiece) by using the screw 2, first, the flange 4a of the transformer 4 is placed on the frame 3 and then the flange 4a is mounted. The spacer 1 was supplied onto the 4a, and then the screw 2 was supplied to fix the flange 4a to the frame 3.

[0006]

However, in the above-mentioned conventional assembly, the spacer and the screw are supplied separately, so that the robot hand also has the spacer and the screw. There was a problem that it was necessary to prepare separately.

In addition, the positioning of the spacers is complicated and there is a problem that it takes time to assemble.

In order to solve such a problem, as shown in FIG. 6, a suction member 5 composed of inner and outer double cylinders 5a and 5b connected to a suction pump (not shown) is provided and a screw 2 is provided.
It is conceivable to provide a means for simultaneously adsorbing the spacer 1 and the spacer 1, as shown in FIG. 7, a suction member 6 for adsorbing the screw 2 and a chuck 7 for holding the spacer 1 in one robot hand.

However, with the means shown in FIG. 6, it is difficult to obtain a sufficient suction force for the spacer 1, and there is a problem that the spacer is likely to drop when the robot hand moves.

Further, in the means shown in FIG. 7, the chuck 7
Therefore, there is a problem that it cannot be used when the screw mounting location is narrow and the chuck mechanism is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, to provide a screw spacer capable of simplifying the structure of the robot hand and shortening the assembling time.

[0012]

In order to achieve the above object, a screw spacer of the present invention is a spacer made of synthetic resin having a hole into which a screw is inserted, the inner surface of the hole engaging with the screw. It is characterized in that a protrusion is provided.

[0013]

In the screw spacer of the present invention, the inner surface of the hole is provided with a protrusion that engages with the screw. Therefore, when the screw is inserted into the hole, the screw and the spacer are temporarily fixed by the engagement of the screw and the protrusion. Are integrated.

Therefore, in order to supply the screws and the spacers, the screws are first inserted into the holes of the spacers to integrate them, and then the screws and the spacers are supplied by simply holding one of them. You can

For this reason, the robot hand can be simplified, and since the positioning of the spacer is unnecessary, the assembling time can be shortened.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A is a front view showing an embodiment of a screw spacer according to the present invention, and FIG. 1B is a b in FIG.
2B is a cross-sectional view, and FIG. 2 is an enlarged cross-sectional view showing a combined state of the screw spacer and the screw.

In these figures, 10 is a synthetic resin screw spacer having a hole 11 into which the screw 2 is inserted.

Reference numeral 12 is a protrusion that engages with the screw 2, and the hole 1
It is formed on the inner surface of 1. The protrusion 12 is formed in a ring shape having a triangular cross section. The inner diameter R of the protrusion 12 is smaller than the outer diameter of the screw 2 by about 0.5 mm, for example.

Such a screw spacer 10 has a hole 11
Since the protrusion 12 that engages with the screw is provided on the inner surface of the screw, when the screw is inserted into the hole 11, the screw 2 and the spacer 10 are engaged by the screw 2 and the protrusion 12 as shown in FIG.
And are temporarily fixed and integrated. Since the protrusion 12 is formed in a ring shape having a triangular cross section, the screw 2 becomes an interference fit due to plastic deformation of the synthetic resin.

FIG. 3 is a sectional view showing an example of a robot hand.

Reference numeral 20 denotes a screw suction portion, which is connected to a suction pump (not shown). The suction portion 20 has a cylindrical shape, and its tip has a curved shape so as to fit the head portion 2 a of the screw 2.

Reference numeral 21 denotes a screw rotating bit, which is arranged inside the suction portion 20.

Using such a robot hand, screw 2
In order to supply the spacer 10 and the spacer 10 to the work, the screw arranged on the pallet (not shown) is first sucked by the suction portion 20, and then the screw 2 is inserted into the hole of the spacer 10 to integrate them. After that, as shown in FIG. 3, the spacer 2 is moved to the screw tightening position with the screw 2 integrated with the spacer 10 being sucked, and the bit 21 is rotated to tighten the screw 2.

As described above, according to the screw spacer 110 of the present embodiment, the robot hand can be simplified, and since the positioning of the spacer is unnecessary, the assembling time can be shortened. .

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be appropriately made within the scope of the present invention.

[0027]

According to the screw spacer of the present invention, the robot hand can be simplified and the assembling time can be shortened.

[Brief description of drawings]

1A is a front view showing an embodiment of a screw spacer according to the present invention, and FIG. 1B is a sectional view taken along line bb in FIG. 1A.

FIG. 2 is an enlarged cross-sectional view showing a combined state of a screw spacer and a screw.

FIG. 3 is a sectional view showing an example of a robot hand.

FIG. 4 is a sectional view showing an example of a conventional spacer.

FIG. 5 is a partial cross-sectional front view showing an example of using a spacer.

FIG. 6 is an explanatory diagram of a conventional technique.

FIG. 7 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 10 Screw Spacer 11 Hole 12 Protrusion

Claims (1)

[Claims] 1. A spacer for screws, which is a spacer made of synthetic resin having a hole into which a screw is inserted, wherein a projection engaging with the screw is provided on an inner surface of the hole.