JPH10296554A - Thread fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a jam of a member and a part so as to smoothly perform transfer to the following process by providing an internal thread member holding base which is pushed down and returned to the waiting position according to an elevating/lowering motion of a driver member. SOLUTION: When a driver bit 2 starts to rotate, an internal thread member holding base 11 is pushed down with an internal thread member 12 while an external thread member 9 is screwed to the internal thread member 12 set on the internal thread member holding base 11. When screwing is finished, the external thread member 9 and the internal thread member 12 are integrated together. A drive mechanism 1 is lowered further so as to push down the internal thread member holding base 11 to the lower limit, and then, the internal thread member holding base 11 is stopped in the lower limit. After parts are discharged from the internal thread member holding base 11, the internal thread member holding base 11 is lifted to the waiting position, which is the upper limit, by means of a spring 14 and an air cylinder 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw tightening device for screwing a male screw member to a female screw member and integrating them.

[0002]

2. Description of the Related Art In a terminal portion for connecting, for example, a power transmission line of an electric or electronic device, a structure is known in which a conductive wire is wound around a male screw screwed into a female screw member fixed to a case and the male screw is tightened. ing. To form the terminal portion, a male screw member is screwed to the female screw member and an integrated part is assembled. Therefore, it is necessary to perform a screw tightening operation in which the male screw member is screwed to the female screw member before assembly. Screw tightening can be performed manually, but if it is mechanized, it can be screwed efficiently in a short time and made into an assembled part. Conventionally, as a device in which screw tightening is mechanized, as illustrated in FIG. 4, a driver mechanism 31 sucks a male screw member 33 using a suction device 32,
When the driver bit 35 descends toward the female screw member 34 supplied immediately below and comes into contact with both members, the driver bit 35 is moved to the male screw member 33.
It is known that, when fitted to a screw, it is screwed by being rotated by a motor (not shown). In such a screw tightening device, a spring 36 is interposed in the driver bit 35 as a shock absorbing means because an impact is generated due to a collision of the female screw with the tip of the male screw when the driver having the male screw descends.

[0003]

However, since the driver bit must be a mechanism that absorbs shock while rotating, the structure becomes complicated, and the number of parts increases, making it difficult to make the driver mechanism compact. On the other hand, since only a small spring can be incorporated, fine adjustment of the shock absorbing power cannot be performed. Then, the screw tightening operation is performed by the female screw member 3.
Since the operation is performed on the table 37 fixed on the extension of the supply path of No. 4, the members may be jammed due to a shift in the timing of supply and discharge of the members.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a screw tightening device for screwing a male screw member to a female screw member to integrate the two with each other. A driver mechanism that picks up from the delivery unit, and that can raise and lower and rotate the male screw member;
A female screw member which stands by immediately below the male screw member transfer section, introduces a female screw member supplied from the second supply means, and allows a lowering operation and a return operation to a standby position in accordance with the elevating operation of the driver member. And a holding table. The female screw member holding base is controlled by a spring and an air cylinder to control a lowering operation, a stop at a lowering position, and an ascending operation, and the male screw member is screwed into a lower position of the female screw member holding base by screwing the male screw member. A pusher mechanism for feeding the female screw member integrated with the pusher mechanism can be provided.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a screw fastening device according to the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a driver mechanism. The driver mechanism 1 includes a driver bit 2 which is moved up and down by a cylinder (not shown) and rotated by a motor (not shown). The driver bit 2 is protruded from directly below the suction chamber 3, and the protruding portion is covered to the tip by a suction tube 4 coaxial with the driver bit 2 and protruding from the suction chamber 3.
Is pushed into the suction chamber 3 against the force of a spring (not shown) accommodated in the suction chamber 3 so that the tip of the driver bit 2 can be exposed. A suction pipe 5a of a suction machine 5 is connected to the suction chamber 3 of the driver mechanism 1.

[0006] From a parts feeder 6 for supplying a male screw member as a first supply mechanism, a shooter 8 as a supply path is provided.
Approaching the tip of the suction cylinder of the driver mechanism at the ascending position, extending to the delivery position A where the male screw member 9 can be delivered to the suction cylinder 4, and a part for supplying the female screw member as the second supply mechanism. From the feeder 7, a shooter 10 as a supply path extends to a transfer position B where the female screw member 12 can be transferred to a female screw member holding stand 11 waiting just below the driver bit 2. As shown in FIG. 2, the male screw member 9 supplied from the parts feeder 6 is formed by screwing a rectangular presser 9c into a screw portion of a screw 9b having a cross hole 9a at the head. ,
The rectangular plate 12a has a screw hole 12b in the center, and a connecting tongue piece 12c is formed on one side edge, and a locking piece 12d is formed on the other side edge by bending.

The female screw member holding stand 11 waiting just below the driver bit 2 is provided movably in the vertical direction along the vertical guides 13, 13.
By the springs 14, 14 loosely fitted to the third, 13
It is biased to the standby position, which is the upper limit of the movement range. The female screw member holding base 11 can be forcibly moved up and down and stopped at an appropriate position by an air cylinder 16 controlled by a switching valve 15.

Further, stoppers 17 and 17 for stopping the male screw member 9 and the female screw member 12 at the transfer positions A and B of the respective shooters are provided. A pusher mechanism 18 for feeding out a female screw member (hereinafter, referred to as a component) integrated with the male screw member on the member holding base 11 is provided.

Next, the procedure for screw tightening is illustrated in FIG. 3. From the parts feeders 6, 7, the male screw member 9 and the female screw member 12 are continuously connected to each other via the shooters 8, 10. The male screw member 9 which is supplied in the state and is at the most advanced transfer position A is the stopper 1
When the screw 7 is released and pushed out by the supply pressure of the succeeding screw member, the male screw member 9 is captured at the tip of the suction tube 4 and the female screw member 12 is pushed up to the standby position only by the force of the spring 14 and is maintained. It is set on the holding table 11 (FIG. 3A). Subsequently, the driver mechanism 1 descends, and the male screw member 9 adsorbed at the tip of the suction cylinder 4 is pressed against the female screw member 12 set on the female screw member holding base 11, and the pressing force causes the suction cylinder 4 to move into the suction chamber. 3, the cross portion at the tip of the driver bit 2, which is caught from the tip of the suction cylinder 4, is fitted into the cross hole 9 a of the male screw member 9 (FIG. 3B).

Subsequently, the driver bit 2 starts rotating, and while the male screw member 9 is screwed into the female screw member 12 set on the female screw member holding base 11, the female screw member holding base 11 is pushed down together with the female screw member 12 (FIG. 3). (C)). When the screwing is completed and the male screw member 9 and the female screw member 12 are integrated, the rotation of the driver bit 2 is stopped by the action of a torque limiter (not shown). The driver mechanism 1 further descends and pushes the female screw member holding base 11 down to the lowermost limit. When the female screw member holding base 11 reaches the lowering limit, the air cylinder 16 is locked by controlling the switching valve 15, and the female screw member holding base is locked. 11 is stopped at the lower limit, while the driver mechanism 1 is retracted upward (FIG. 3).
(D)).

Next, the components assembled by the action of the pusher mechanism 18 are repelled from the female screw member holding base 11 and dropped into the lower tray 19 (FIG. 3 (e)). After the components have been discharged from, the female screw member holding base 11 is raised by the spring 14 and the air cylinder 16 to the standby position, which is the upper limit (FIG. 3 (f)). Thereafter, the above steps are repeated.

In the screw tightening device thus formed, when the male screw member 9 is pressed against the female screw member 12 set on the female screw member holding base 11 by the lowering of the driver mechanism 1, an impact is generated by the force of the spring 14. After the parts are absorbed and the parts are discharged, they are forcibly returned to the standby position by the air cylinder 16, so that quick operation becomes possible and the speed can be increased. Further, since the shock absorbing means is provided on the female screw member holding base 11 side, the driver mechanism 1 is simplified and the reliability is enhanced. And the air cylinder 1
The degree of shock absorption can be adjusted by adjusting the degree of air release 6 by the air controller 20. Further, since the transfer position and the discharge position are separated from each other, the members and components do not become jammed, which is convenient for connecting the transfer means to the next process.

In the embodiment, the form of the male screw member and the female screw member is not limited to the embodiment. In addition, the control of the air cylinder, the driver mechanism in the screw tightening process, and the timing of the elevating operation of the female screw member holding table are also required. , May be changed as appropriate.

[0014]

According to the present invention, the driver mechanism can be simplified, can be arranged in a small space, causes less trouble, and is excellent in maintainability. In addition, it is possible to prevent the members and the components from being jammed due to a difference in the supply timing of the members and the components, and the delivery to the next process becomes smooth. Then, the shock absorbing force can be arbitrarily adjusted.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a screw fastening device according to the present invention.

FIG. 2 is an explanatory diagram of a male screw member and a female screw member.

FIG. 3 is an explanatory view of the operation of the screw fastening device.

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

1. Driver mechanism, 2. Driver bit, 3. Suction chamber, 4. Suction cylinder, 5. Suction machine, 6, 7, Parts feeder, 8, 10, Shooter, 9, Male screw member ,
11 ··· Female screw member holder, 12 ·· Female screw member, 13
..Vertical guides, 14 springs, 16 air cylinders, 17 stoppers, 18 pusher mechanisms,
A, B ... Delivery position.

Claims (3)

[Claims] 1. A screw tightening device for screwing a male screw member to a female screw member to integrate them, wherein the male screw member supplied from a first supply means is picked up from a transfer portion, and is lifted and lowered. And a driver mechanism capable of imparting rotation to the screw member, and a stand-by just below the male screw member transfer section, and a female screw member supplied from the second supply means is introduced, and the press-down and standby are performed in accordance with the elevating operation of the driver mechanism. A screw tightening device including a female screw member holding base capable of returning to a position. 2. The female screw member holding base is lowered by a spring and an air cylinder, stopped at a lowered position,
The screw tightening device according to claim 1, wherein the ascending operation is controlled. 3. The screw tightening device according to claim 1, wherein a pusher mechanism for feeding out a female screw member integrated with the male screw member by screwing the male screw member is provided at a depressed position of the female screw member holding base.