JPS59107867A - Chuck unit of automatic screw driver - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Regarding the chuck unit of the tightening machine.

In general, this type of automatic screw tightening machine is
(As shown in Figures 4 and 5, 11 is a chuck body (3) and a chuck, and a pair of chuck jaws (4) pivotally attached to the chuck body (3) so as to be able to swing freely. It consists of a horn fitting (6) that feeds the screw (8) onto the chuck claw (4).The chuck claw (1) of this chuck unit (1)
4) has its tip always urged in the closing direction by the spring (5), and is a dry beer.

One tapered locking hole (b) on the travel path of g (2)
is configured so that it is formed. Also, this chamfer claw (4) communicates with the locking hole (■) and is connected to the straight hole (C).
is configured so that it is formed.

This straight hole (C) is formed with a diameter that allows the shaft of the screw (8) to be inserted therethrough. This chuck unit (1
), the screw (8) held by the chuck claw (4) is long, and as shown in Figure 6, when the head of the screw (8) reaches the straight hole (c), the screw ( When tightening an object (C) where the tip of the screw (8) does not reach the pilot hole (E) of the object (C), the screw (8) is pushed out from the chamfer (4), Remove from the locking hole (c) and screw (
When the straight hole (c), which is smaller than the diameter of the head of screw (8), is reached, the tip of the chuck claw (4) is located far away from the periphery of the shaft of the screw (8), and the head of the screw (8) Only one end of the outer periphery of the screw (8) contacts the chuck claw (4), and the tip of the shaft is not fully guided. Therefore, the tip of the shaft of the screw (8) tends to wobble, and it is inserted into the predetermined prepared hole ψ. There are many disadvantages such as the inability to perform the desired screw tightening work.

The present invention was developed with the aim of eliminating the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. In Figures 1 and 2, (1) is a chuck unit for automatic tightening, which is a chuck that can be moved integrally with the dry screw bit (21) or can be raised and lowered relative to the dry screw bit (2). It has a main body (3).
) has a pair of claws (4) that can be opened and closed, and are biased by springs (5) so that the tips thereof are closed. A hose fitting (6) is fixed to the main body (3), and a sliding screw guide hole (7) is connected to the hose fitting (6).
There are 4 tons of holes. In addition, a component supply device (not shown) is connected to the hose fitting (6) via a feed pipe (not shown), and a component supply device (not shown) is connected to the hose fitting (6), and a component supply device (not shown) is supplied with air. It is configured so that the water is supplied up to the claw (4).

When the chuck claw (4) is in the closed state, a slotted first locking hole (9) is formed, and the chuck claw (4) communicates with the first locking hole (q) and is connected to the screw ( A first straight hole a0 having a diameter through which the shaft portion 8) can be inserted is formed. This first straight hole 0Ill is m
It has a larger diameter than the driver bit (2) marked J, and is configured so that it does not come into contact with the chuck claw (4) when the driver bit (2) passes through. Further, the chuck claw (4) is configured to have a reverse tapered guide hole OD communicating with the first straight hexagon θ1 and communicating with the guide hole θυ and with the head of the screw (8). A second straight hole with a diameter slightly larger than the diameter of the second straight hole is formed. Furthermore, the second claw (4)
A second locking hole 03 communicating with the straight hole (2) and holding the screw (8) is formed, and also communicating with the second locking hole and being equal to the first straight hole 00. A third straight hole Q4 having the same diameter as the straight hole Q4 is formed.

A screw guide Qυ is attached to the chuck body (3) so as to be movable together via a mounting plate O→, and the screw guide OG is rotatable within a plane that includes the axis of the driver bit (2). is maintained.

Furthermore, this screw guide Qfl is pressed by the rod 09 of the cylinder A frame which is sloped through the cylinder fitting 0, so that its tip is always located outside the movement path M of the dry guide ()<2). It is composed of Further, a detection switch blade is fixed to the cylinder fitting αη, and constitutes a safety device for detecting the state of the screw guide OQ. The screw guide aω is elastically biased so that when the rod θ1 is retreated, the tip thereof protrudes onto the moving path of the driver guide L21. A pair of guide claws Qυ are pivotally attached to the tip of this screw guide Q5, and the screw guide Q5 is elastically biased so that it can be opened and closed at right angles to the axis of the driver via (2+) and the tip is always closed. When the guide claw Qυ is in the closed state, a tapered second guide hole (2) and a fourth straight hole (2) communicating with the second guide hole (2) are formed. This fourth straight 1-hole track has a diameter that allows the shaft of the screw (8) to pass through.The cylinder CI frame also has a diameter that allows the chuck claw (4) to stop at a predetermined position. The air circuit is configured so that the opening 09 is retracted and the tip of the screw guide (19) is positioned below the chuck claw (4).

When screwing a screw (8) with a long shaft into a mating object (c) as shown in Figure 3 (al (bl)) using the automatic screw tightening machine described above, the tip of the chuck (4) must be Opponent (c)
approach and stop in place. At the same time, cylinder 0
Make the steps m+h and move the rod 0 backwards. Therefore, the screw guide αG rotates counterclockwise and protrudes to a predetermined position below the chuck claw (4). Thereafter, the driver screw (2) descends, and its tip abuts the head of the screw (8) held in the first locking hole (9) of the chuck jaw (4). When the driver bit (2) further descends, the screw (8) pushes the chuck claws (4) apart and descends. At this time, the tip of the shaft of the screw (8) passes through the prepared hole 4 on the upper side of the counterpart (c). The screw (8) further descends, its head passes through the first locking hole (9), and descends along the first nutrate hole OQ and guide hole 0υ,
The second straight hole reaches Q2t. At this time, screw (8)
Since the head of the screw (8) is smaller than the diameter of the second nutrate hole (2), the tip of the chuck claw (4) is closed again, and the screw (8) is closed.
) is guided by chuck claws (4). In this situation, when the screw 8) descends inside the screw claw (4) and the tip of the screw (8) protrudes from the pilot hole (7) of the other object (c), Since the guide pawl FAD of the screw guide OQ is arranged below, the screw (8) is guided from the shaft portion to the second guide hole (A) and then to the fourth straight hole (2). Therefore, even if the head of the screw (8) tries to move in the radial direction within the second straight hole α2, the screw (8)
Since the shaft portion of the screw (8) is reliably guided, the screw (8) will not tilt. Further, in this state, the head of the screw (8) passes through the second straight hole (2) and comes into contact with the second locking hole Q3, and the chuck claw (4) is pushed open again. When the head of the screw (8) reaches the third straight hole a<, the tip of the screw (8) smoothly reaches the pilot hole (E) of the counterpart (C). after that,
The rotation of the driver bit (2) is transmitted to the screw (8),
The screw (8) is screwed into the counterpart (c). Screw (8
) is firmly screwed into the mating part (c), the cylinder (8
) returns, and rod 0 is prominent. Therefore, at the same time that the screw guides a rotate and separate from below the chuck claw (4), the guide claw Qυ is also temporarily pushed apart by the screw (8) and leaves.

As explained above, the present invention is configured to constantly guide the long screw shaft after it is held by the chuck claw until it is securely screwed into the mating object. Because there are
The shaft of the screw can reliably reach the specified position in the object, and even if the tip of the screw comes off from the object during screwing, the screw can be reliably screwed into the object. There are advantages such as Further, the present invention has the advantage that the shaft portion of the screw does not wobble in the middle, so there is no possibility of damaging the other object.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main part of the present invention, and Fig. 2 is a line AA in Fig. 1.
3 is a sectional view of the main part showing the operating state of the present invention, FIGS. 4 and 5 are sectional views of the main part showing the conventional example, and FIG. 6 is the operating state of the conventional example. FIG. (1) Chuck unit, (2) Driver bit, (3
) chuck body, (4) chuck jaw, (5) flap,
(6) Hose fitting, (7) Screw guide hole,
(8) Screw, (9) 1st rest hole, θ0 1st straight hole, θυ guide hole, (6) 2nd straight hole, Q3 2nd locking hole, 0 x 3rd slate hole, Q6 screw Guide, θQ storage plate, 0η cylinder storage fixture, 0 barrel cylinder, 090 throat, kiln detection nui nochi, QD guide claw, @2nd guide hole, 4th straight hole, (c) Opposite object, (7) Bottom hole, (ho)
Pilot hole, ■ Locking hole, (c) Straight hole,
Patent applicant Nitto Seiko Co., Ltd. Figure 12 Figure 3 (α) 4th [1 5th @

Claims (1)

[Claims] 1) A rotatable and movable driver bit (2) and -
Place the chuck body (3) movably on the I+ or with respect to the driver bit (2), attach the chuck jaws (4) to the chuck body (3) so that they can open and close, and
4) in a direction in which the tip thereof is always closed, and two screw guides are disposed on the chari body (3) so as to be movable together with it, and this tip is attached to the driver viat (2). This screw guide 0Q is always located outside the movement path.
A chuck unit for an automatic screw tightening machine, characterized in that the chuck unit is arranged so as to be able to protrude onto a moving path of the driver bit (2). 2) The automatic screw tightening machine according to claim 1, wherein the screw guide 00 has a pair of guide claws Qυ that can be opened and closed on a plane perpendicular to the axis of the driver bit (2); Kuuninoto. 3) Screw guide a! The automatic screw tightening device according to claim 1 or 2, wherein i is configured to protrude onto the moving path of the driver bit (2) when the tip (1) stops descending. Machine chuck unit.