JP3284531B2 - Screw guide device for screw tightening machine for connecting screws - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting screw screwing machine, and when a leading screw is supplied to a driving portion, a next (second) screw is pushed away so as to be separated from the leading screw. The present invention relates to a screw guide mechanism for facilitating a screw-in operation of a screw-fastened member.

[0002]

2. Description of the Related Art A connecting screw provided to a connecting screw screwing machine is a plurality of screws connected at an equal pitch of a connecting band.
The screw tightener is provided with a screw feed mechanism that feeds a screw one by one to a screw driving portion at a tip end of the screw tightener by feeding a connection band at an interval equal to a connection pitch. In particular, a screw tightening machine of the type that screws a tile material to a base material accurately strikes a screw in a through hole formed in the tile material, so that the supplied screw has a toe of the screw tightener. It is configured to protrude from the tip of the embossed portion.

[0003]

However, in the state where the leading screw is fed into the screw driving section, the next screw 30
Are substantially parallel to each other as shown in FIG. 10, so that when the leading screw 4a is screwed in, the next screw 4b is stuck to the tile material 30 so that it is difficult to aim the leading screw 4a in the through hole 31. In some cases, screwing becomes impossible because the part 32 cannot be retracted, or the driver bit 33 comes off from the screw in some cases.

The present invention solves the above-mentioned drawbacks, and in particular, ensures that the leading screw is screwed in by pushing back and separating the next screw at the same time as the leading screw is supplied to the driving portion of the screw tightening machine. It is an object of the present invention to provide a screw guide mechanism in a connecting screw screw tightening machine which can improve the workability.

[0005]

In order to solve the above-mentioned problems, a screw guide device in a screw tightening machine for a connecting screw according to the present invention holds a screw at a predetermined interval in a longitudinal direction of a connecting band. The connecting screw is inserted into a guide passage for the connecting screw provided across the nose near the tip of the nose mounted relatively movably in the screwing direction of the screw at the tip of the screw tightener body, The leading screw of the connection screw is supplied between a pair of chuck claws provided to be able to open and close substantially at the center of the nose portion in conjunction with the relative movement of the nose portion with respect to the screw tightening machine body. In a screwdriver for connecting screws driven with a driver bit,
The nose portion includes a guide member that closes an opening on the screw supply side of the chuck claw when the leading screw is supplied in conjunction with the relative movement of the nose portion with respect to the screw tightening machine main body, and interlocks with the closing operation of the guide member. And an interference member for moving a screw next to the head screw in a direction away from the head screw.

[0006]

FIG. 1 is a perspective view of a distal end portion of a screwdriver for a connecting screw according to the present invention. The screwdriver is relatively mounted on a nose holder 1a at the distal end of a screwdriver body 1 in the screwing direction of the screw. The nose portion 2 is attached so as to be movable (extended and contracted), the leading screw 4a of the connecting screw 3 is guided and supplied to the screw driving portion of the nose portion 2, and the supplied leading screw 4a is provided on the screw tightening machine body. It is screwed in with a driver bit 5 (see FIG. 2). The nose portion 2 is always biased by a spring so as to extend from the screw tightening machine main body 1. The rotation of the driver bit 5 is controlled in cooperation with a rotation drive mechanism (not shown) provided inside the screwdriver body.

The connecting screws 3 are formed by holding holes 7 at regular intervals in the longitudinal direction of a connecting band 3a made of a synthetic resin, and holding the screws 4 in the respective holding holes 7 to connect the screws. The band 3a has a rectangular cross section. As shown in FIG. 2, the connecting screw 3 engages with a feed wheel 8 provided on the nose portion 2, and when the nose portion 2 moves to extend from the screw tightening machine main body 1 after screwing, the connecting screw 3 The feed wheel 8 rotates by a predetermined rotation angle in conjunction therewith, and feeds the connection screw 3 by one screw. Any known screw feed mechanism may be used.

In the vicinity of the tip of the nose portion 2, a screw passage portion 9 for guiding the connecting screw 3 so as to be inserted therethrough is provided so as to cross the nose portion 2 (from bottom to top).

As shown in FIGS. 2, 3 and 4, the screw-out portion is located substantially at the center of the nose portion 2.
It is constituted by a pair of left and right chuck claws 10 provided on both sides of the screw passage portion 9. The chuck pawls 10 are supported on support shafts 11 provided on the left and right sides of the screw passage portion 9 so as to be openable and closable left and right, and are spring-biased in the closing direction. Also, as shown in FIG. 4, the upper part (discharge side of the connection screw 3) inside the closed surface of both chuck claws 10 is in a closed state, whereas the lower part (supply side of the leading screw 4a). Is open. The tip of the screw is configured to protrude from the chuck claw 10 when held by the chuck claw 10.

Next, a guide member 1 is provided on one side of the nose portion 2 for opening and closing an open portion on the screw supply side of the chuck claw 10 in conjunction with the relative movement of the nose portion 2 with respect to the screw tightening machine main body 1.
3 are provided. The guide member 13 is formed in a plate shape as shown in FIG. 5, and a rear portion 13a is rotatably supported by a shaft 18 on the side of the nose portion 2 so as to be vertically rotatable. A guide piece 13b is formed to be bent inward, and a roller 14 is attached to the rear end. The upper portion of the guide piece 13b is bent forward, and the inner edge 13c is inclined. On the other hand, as shown in FIG. 5, a sliding groove 15 for slidingly guiding the roller 14 is formed on the inner wall of the screw tightener main body 1 side. The sliding groove 15 is formed in a parallelogram shape. Thereby, when the nose portion 2 extends or contracts with respect to the screw tightening machine main body 1, the roller 14 slides along the sliding groove 15 as shown by an arrow. The guide piece 13b of the member 13 moves up and down to open and close the screw passage as described later. The roller 14 is at the position A of the sliding groove 15 when the nose portion 2 is in the extended state, and is at the position B when the nose portion 2 is in the contracted state.

The nose portion 2 is provided with an interference member 16 which pushes back the screw 4b next to the head screw 4a and moves the screw 4b away from the head screw 4a when the head screw 4a is supplied. The interference member 16 is formed of an L-shaped plate and has a shaft 19 parallel to the screwing direction on the tip end surface of the nose portion 2.
The one interfering piece 16a is capable of moving forward and backward into the screw passage when rotating, and the tip of the other operating piece 16b is engageable with the shoulder 17 at the front end of the guide member 13 when supplying the screw. Is formed.

Here, the operation of the screw guide device having the above configuration will be described. When the nose portion 2 is extended from the screw tightening machine main body 1, the leading screw 4a is held by the chuck pawl 10 as shown in FIGS. 1 to 4, and the guide piece 13b at the front end of the guide member 13 is The open portion of the chuck claw 10 is closed, and the roller 14 at the rear end is located at a point A below. When the nose portion 2 is pressed into the screw tightening machine main body 1 while pressing the nose portion 2 against the screw-fastened member 20 at the time of screw tightening, the nose portion 2 contracts with respect to the screw tightening machine main body 1. Relatively advances and engages with the head groove of the leading screw 4a to screw the leading screw 4a into the screw-fastened member 20.

When the nose portion 2 contracts, the roller 14 of the guide member 13 slides along the lower groove 15a of the slide groove 15 as shown in FIG. The guide member 13 is guided upward along the oblique groove 15b of the groove 15 and further moves through the upper groove 15c to reach the point B, so that the guide member 13 rotates as shown in FIGS. To open the open portion of the chuck claw 10. At this time, since the guide piece 13b moves over the next screw 4b and moves below the screw, the support for the leading screw 4a is released. However, the leading screw 4a is almost screwed in and no support is required. Absent. After reaching the pushing end and screwing in, the nose part 2 is tightened
When it is separated from 0, the nose portion 2 extends from the screw tightening machine body 1 by a spring, so that the roller 14 of the guide member 13 moves in the upper groove 15 c of the sliding groove 15. Then, the feed mechanism operates before reaching the moving end, and the next screw 4b before screwing becomes the leading screw 4a and moves upward, and is supplied to the inside of the chuck claw 10. Immediately thereafter, the roller 14 moves downward along the oblique groove 15d, so that the guide member 13 rotates as shown in FIGS. 8A and 8B, and the guide piece 13b Is operated in the closing direction to hold the leading screw 4a so as not to fall downward, and the next screwing is prepared as shown in FIG.

When the guide piece 13b of the guide member 13 moves upward following the leading screw 4a as shown in FIG. 8A while the nose portion 2 is extending, the shoulder 17 at the front end of the guide member 13 is moved upward. Since the engagement member 16 engages with the lower end of the operation piece 16b of the interference member 16 and pushes up, the interference member 16 rotates about the shaft 19, and the interference piece 16a which has been in the upward state advances to the screw passage 9 and rotates downward. Move. Then, as shown in FIG. 8 (b), it engages with the next screw 4b during the rotation and forcibly pushes this screw 4b downward, separates it from the leading screw 4a, and the state shown in FIG. 4 is obtained. . Since the angle of the next screw 4b with respect to the leading screw 4a increases and the degree of protrusion from the nose portion 2 also decreases, the leading screw 4a can be freely aimed at a desired position of the screw-fastened member 20. The above-mentioned screwing is performed in this state.

When the guide piece 13b of the guide member 13 is opened again immediately before the screwing is completed, as shown in FIG.
The engagement with the interference member 16 is released, and the next screw 4b which has been further separated by the feed mechanism becomes the leading screw and moves upward while sliding on the inner edge of the interference piece 16a.
The interference member 16 rotates in the opposite direction, and the interference piece 16a is retracted from the screw passage portion 9 again to be in the state shown in FIG.

As described above, when the nose portion 2 is ready for screwing, the leading screw 4a is securely guided by the chuck pawl 10 and the guide member 13 so as not to roll, and at the same time, the next screw 4b is formed. Is guided by the interference member 16 to be displaced away from the leading screw 4a as shown in FIG.
When aiming at a predetermined position of the threaded member 20, the next screw 4
b can be accurately and reliably screwed into the target position without obstruction, and the inconvenience that the driver bit 5 comes off from the leading screw 4a can be avoided, so that the workability is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a screw guiding device of a screw tightening machine for a connecting screw according to the present invention.

FIG. 2 is a bottom view of a chuck claw in the guide device as viewed from below.

FIG. 3 is a side view showing a main part of the guide device with details of a feed wheel and the like omitted.

FIG. 4 is a front view of a nose portion showing the guide device.

FIG. 5 is an explanatory view of a sliding state of a sliding groove of a screw tightening machine main body and a roller of a guide member.

FIG. 6 is a side view showing an operation mode of the guide member when the nose portion contracts.

FIG. 7 is a front view showing the operation mode.

FIGS. 8 (a) and (b) are explanatory diagrams of the operation state of the interference piece when the nose portion is extended.

FIG. 9 is an explanatory view of a screw tightening mode using a conventional screw tightening machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw tightener main body 2 Nose part 3 Connecting screw 4a Lead screw 4b Next screw 10 Chuck claw 13 Guide member 13b Guide piece 16 Interference member

Claims (1)

(57) [Claims] 1. A nose part in which a connecting screw formed by holding screws at regular intervals in a longitudinal direction of a connecting band is attached to the tip of a screw tightening machine body so as to be relatively movable in the screwing direction of the screw. The leading screw of the connecting screw is inserted into the center of the nose part in conjunction with the relative movement of the nose part with respect to the screw tightening machine body by inserting the nose part into the guide path for the connecting screw provided so as to cross the nose part near the tip. In a screw driver for a connecting screw, which is supplied between a pair of chuck claws provided to be able to open and close and drives the supplied screw with a driver bit, the nose portion has a relative position with respect to the main body of the screw driver. A guide member that closes the opening on the screw supply side of the chuck claw when the leading screw is supplied in conjunction with the movement, and separates the next screw of the leading screw from the leading screw in conjunction with the closing operation of the guide member. That a interference member for moving countercurrent screw guide device in screwing machine connecting screw, characterized in.