JPS6231222Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic screw driver that pushes out a screw fed through a screw feeding hole and held by a jaw by the downward movement of a bit, and tightens it against a workpiece.

In current screw tightening machines, the jaws are urged to close each other by a spring or the like, and therefore, the jaws are opened by the pushing action of the screw accompanying the downward movement of the bit. That is, when the screw is pushed out by the bit, the head of the screw comes into sliding contact with the inner peripheral surface of the jaw, opening the jaw. By the way, if the screw head is used to open the screw head in this way, for example, if a colored screw with a colored screw head is used, the sliding contact during extrusion will cause the periphery of the screw head to open. The paint on the parts may peel off, which has the problem of damaging the design of the workpiece. In addition, when tightening a so-called adjustment bolt 22 with a nut 21 screwed halfway through the screw 20 to the workpiece as shown in FIG.
Since the bit 23 is rotating, the rotation of the bit 23 causes the nut 21 to tighten between the time when the head of the adjusting bolt 22 is caught and the time when it is pushed out.
There is also the problem that the head of the adjusting bolt 22 is screwed in as shown in FIG.

In view of this, the present invention attempts to solve the above-mentioned problems with colored screws, adjuster bolts, etc. by opening the jaw using a new and separate means just before the bit pushes the screw.

This will be explained below based on the drawings. Figure 1 shows a stationary automatic screw tightening machine as an embodiment of the present invention.
In the figure, 1 is a column, 2 is a frame attached to the column 1, 3 is an air cylinder provided on the frame 2, and 4 is a support plate attached to the rod of this cylinder 3, which is moved up and down by a slide shaft 5. being guided. The slide shaft 5 is connected to a catcher plate 6, and
It is supported by the frame 2 so as to be able to move up and down. A compression spring (not shown) is interposed between the catcher plate 6 and the support plate 4.
Further, the catcher plate 6 is configured to be prevented from descending by a stopper 7 when it descends by a certain amount. For this reason, when the air cylinder 3 is extended, the support plate 4 and catcher plate 6 initially descend simultaneously, but after the catcher plate 6 contacts the stopper 7, only the support plate 4 descends. . A rotary drive source 8 such as a motor is mounted and fixed on the support plate 4, and a nose 9 is attached on the catcher plate 6. As shown in FIG. 2A, bit insertion holes 10a are formed in the nose 9 at the top and bottom, and the holes 10a
A bit 12 connected to the rotary drive source 8 via a drive shaft 11 is inserted therein. Further, a screw feeding hole 10b is formed in the nose 9, which joins the bit feeding hole 10a, and a pair of jaws 13, 13 are provided at the lower end of the nose so as to close the opening at the lower end of the bit insertion hole 10a. They are provided so that they can be closed to each other.

Separate jaw opening rods 14, 14 are provided on the side surfaces of each jaw 13, 13 so as to extend in a direction intersecting the direction in which the jaws 13, 13 extend. The support plate 4 has a bit 1.
A working rod 15 is provided which moves downward in unison with the jaw opening rod 15, and the lower end of the working rod 15 passes through the catcher plate 6, as shown in FIG. It is facing upward. When the bit 12 is at the top dead center, the vertical distance between the lower end of the working rod 15 and the jaw opening rod 14 is greater than the distance between the lower end of the bit 12 and the head of the screw 16 held by the jaws 13, 13. The working rod 15 is set to be a little shorter and is configured so that the working rod 15 comes into contact with the jaw opening rods 14, 14 just before the tip of the bit 12 comes into contact with the head of the screw 16 while the bit 12 is moving forward. In addition, a V-shaped inclined surface 17 is formed on the rear facing surfaces of the Jyo opening bars 14, 14, so that the lower ends of the working rods 15 can easily enter and the Jyo opening bars 14, 14 can easily open left and right. It is configured.

Next, the operation of this configuration will be explained. When the air cylinder 3 is operated, the support plate 4 and catcher plate 6 are lowered simultaneously. When the lower end of the nose 9 attached to the catcher plate 6 reaches a position just before contacting the workpiece 18, the catcher plate 6 comes into contact with the stopper 7.
Prevented from descending. On the other hand, the support plate 4 continues to descend against the compression spring even after the catcher plate 6 stops descending. Therefore, the bit 12 begins to descend within the bit insertion hole 10a. At the same time, the operating rod 15 also begins to move toward the jaw opening rods 14, 14 relative to each other. and bit 12
In synchronization with the lowering of the jaw, the relative distance with the jaw opening bars 14, 14 is shortened, and just before the bit 12 catches the screw 16 held by the jaw, both jaw opening bars 1
It will arrive between 4 and 14. Due to this thrust, each Jyo opening rod 14, 14 receives a pushing and spreading force, and the Jyo 1
Open 3 and 13 to the left and right. When the jaws 13, 13 open, the screw 16 that was held until then falls,
It falls into the hole 19 of the workpiece 18. On the other hand, bit 1
2 descends to follow the falling screw 16,
Grasp the head of the screw 16 that has fallen into the hole 19 of the workpiece, and use the rotational force transmitted from the driver shaft 11 to screw the screw 16 into the hole 19 of the workpiece to a predetermined depth (see Figure 2C). . The predetermined depth refers to the depth from the tip of the bolt to the position where the nut 22 is located in the case of the illustrated adjusting bolt, and refers to the depth from the tip of the bolt to the head in the case of a normal bolt. In order to screw the screw 16 to a predetermined depth to the position of the nut 22, a separate device (not shown) is used to stop the lowering and rotation of the bit 12 after the screw 16 has been screwed in a predetermined amount. still,
In this embodiment, the working rod 15 is attached to the support plate 4, but the working rod only needs to be provided so that it moves downward in unison with the bit, and therefore, the attachment position is not limited to the supporting plate 4. be.

As explained above, the present invention is constructed so that just before the bit pushes the screw, the lower end of the operating rod enters the center of both jaw opening bars to open the jaw. There is no need to open the joint and therefore, when screwing in colored screws, there is no need to peel off the paint during extrusion.
Furthermore, when using an adjusting bolt, the nut can be tightened to the workpiece while remaining in its original screwed-in position without having to screw the nut all the way to the bolt head.

[Brief explanation of the drawing]

Figure 1 is an overall view showing one embodiment of the present invention;
Figure A is a side sectional view of the main part, Figure B is a front view of Figure A,
3A and 3B are diagrams showing a state in which the adjusting bolt is pushed out of the jaw using a conventional screw tightening machine. 9... Nose, 13, 13... Jiyo, 14,
14... Jiyo opening rod, 15... Working rod, 16...
…screw.

Claims (1)

[Claims for Utility Model Registration] A support plate 4 to which a rotary drive source 8 and a bit 12 that rotates in response to the rotation thereof are attached, and a pair of closing jaws 1 on the movement path of the bit 12.
A catcher plate 6 having a nose 9 having a nose 9 is disposed, and the support plate 4 and the catcher plate 6 are moved together and by the support plate 4 alone by the operation of an air cylinder 3 attached to the frame 2. Configure it as follows, Jiyo 1
In this screw tightening machine, screws 16 held by screws 3 and 13 are pushed out by a bit 12 and tightened onto a workpiece. are positioned opposite to each other, and an inclined surface is formed on the opposing surfaces on the backward side of the jaw opening rods 14, 14, while an operating rod 15 is attached to the support plate 4 so as to move together, and the tip of the operating rod 15 is is positioned corresponding to the sloped surface of the jaw opening rods 14, 14, and the operating rod 15 is configured to come into contact with the sloped surface of the jaw opening rods 14, 14 during the forward movement of the bit 12. Automatic screw tightening machine.