JP2903512B2 - 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 screw holding device for a connecting screw screwing machine which guides a screw supplied to a driving position of the connecting screw screwing machine so that the screw does not fall during driving.

[0002]

2. Description of the Related Art In general, a connecting screw screwing machine is provided with a guide passage for guiding a connecting screw through a nose portion which moves relatively to a screw tightening machine main body so as to cross a screw driving portion of the nose portion. I have. The guide path for the connecting screw is located at the distal end side of the nose, at a position where the distal end of the screw does not protrude from the distal end surface of the nose. A pair of chuck claws are arranged in the screw driving portion with the guide passage interposed therebetween, and are configured so as to hold the tip screw of the supplied connection screw. As described above, according to the screw tightening machine having the above-described configuration, the screw is held inside the chuck claw without protruding from the chuck claw, so that there is no inconvenience that the screw falls.

When the tip of a screw is driven into a hole formed in a screw-fastened member, as in the case of roofing, it is necessary to project the screw from the tip of the nose.
However, in this case, since the screw tip protrudes from the chuck claw, when the screw is pressed against the surface of the material to be screwed and screwed in, the screw is likely to roll, and a screwing failure may occur. Also, since the entire connecting screw is located at the tip side of the nose, the screw next to the screw of the driving part also protrudes from the nose, and the tip of the screw hits the material to be screwed and bends against the connecting band. When the next screw is sent to the threaded portion, a phenomenon that the screw tip does not reach the center of the chuck claw occurs.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks, and to provide a screw guiding device for a connecting screw screw tightening machine which guides a leading screw of a connecting screw to be held in a predetermined position of a nose portion and screwed in a correct posture. Its purpose is to provide.

[0005]

In order to achieve the above object, a screw guide device for a screwdriver for connecting screws according to the present invention is provided in which a screw is held at regular intervals 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,
Opening the sides of the chuck claws in the closed state that receive the supply of the leading screw, and connecting the screw passage portion of the connection screw guide passage for supplying and guiding the screw from the open portion of the chuck claw to the tip end surface of the nose portion. A guide member for guiding the leading screw to be held by the chuck claw when the opening portion of the chuck claw is opened / closed and closed is disposed on the tip end surface of the nose portion. The part is interlocked with the relative movement with respect to the screw tightening machine main body.

It is preferable that the guide member is operated to open and close the screw passage along the screw passage.

[0007]

According to the first aspect of the present invention, while the leading screw of the connecting screw is supplied to the threaded portion of the nose portion and is held by the pair of chuck claws, the tip of the nose portion is pressed against the threaded tightening member and the screw is screwed. When the screwdriver is pushed into the main body of the screwdriver, the driver bit relatively advances forward and engages with the head groove of the held screw, and screws the screw into the screwed tightening member.

When the nose is separated from the material to be screwed after the screwing, the nose moves relatively to the main body of the screw tightening machine. And the guide member closes the open portion in conjunction with this.

As described above, when the leading screw of the connecting screw is fed between the chuck jaws, the guide member closes the opening of the chuck jaw, and the screw held by the chuck jaw moves in the opposite direction to the feed. Since the screw is held so as not to fall along the screw passage, the screw can be securely screwed by the driver bit.

According to the second aspect of the present invention, the guide member operates so as to open and close the screw passage along the screw passage. Therefore, when the guide member closes the opening, the leading screw of the connecting screw is connected to the chuck pawl. Rotate to feed in between.

[0011]

FIG. 1 is a perspective view of a tip portion of a screwdriver for connecting screws according to the present invention. The screwdriver moves relatively to a nose holder 1 at the tip of a screwdriver body in a screwing direction of the screw. The nose portion 2 is attached as much as possible, the leading screw 4a of the connecting screw 3 is guided and supplied to the screwed portion of the nose portion 2, and the supplied leading screw 4a is supplied to the driver bit 5 provided on the screw tightening machine main body (see FIG. 2). ). The nose portion 2 is urged by a spring 6 so as to always extend from the nose holder 1.

The connecting screws 3 are formed by holding holes 7 at regular intervals in the longitudinal direction of a synthetic resin connecting band 3a, and holding the screw 4 in each holding hole 7. Has a rectangular cross section. As shown in FIG. 2, the connection screw 3 is provided with a feed wheel 8 provided on the nose portion 2.
When the nose part 2 moves to extend from the nose holder 1 after screwing, the feed wheel 8 rotates by a predetermined rotation angle in conjunction with this, and the screw of the connection screw 3 is reduced by one screw. It is configured to send. Any known screw feed mechanism may be used.

A guide passage 9 for guiding the connecting screw 3 so as to be inserted therethrough is provided near the tip of the nose portion 2 so as to cross the nose portion 2 (from bottom to top). The guide passage 9 includes a connecting band passage portion 9a for guiding the connecting band 3a and a screw passage portion 9b for supplying and guiding the screw. The screw passage portion 9b is open at the tip of the nose portion 2.

As shown in FIGS. 2, 3 (a) and 3 (b), the threaded portion is located at substantially the center of the nose portion 2 and a pair of chuck claws 10 provided on both sides of the guide passage 9. It is constituted by. The chuck pawls 10 are supported on support shafts 11 provided on the left and right sides of the guide passage 9 so as to be openable and closable left and right, and are spring-biased in the closing direction. FIG.
As shown in (b), a space 12 for holding a screw is formed inside the closed surfaces of both chuck claws 10. The upper part of the screw holding space 12 (discharge side of the connecting screw 3) is in contact, while the lower part (the side receiving the supply of the leading screw 4a) is open.

Next, a guide member 14 is pivotally supported on a tip 13 of the nose portion 2 by a shaft 13 near the screw passage portion 9b. The guide member 14 advances to the screw passage 9b and closes (the position shown in FIG. 3B), and the guide member 14 retracts and opens from the screw passage 9b (the position shown in FIG. 6B). And is normally urged by a spring (not shown) mounted on the shaft 13 to retract from the screw passage 9b. The guide member 14 is a screw passage 9
b, and one side of the guide member 14 pivots to a position to close the opening 16 below the chuck claw 10 when closed. A projection 17 is formed on the opposite side of the guide member 14.

The opening and closing of the guide member 14 is configured to interlock with the relative movement of the nose portion 2 with respect to the screw tightening machine main body. That is, the shaft 18 is provided inside the nose portion 2.
(See FIG. 3 (a)) is provided in the up-down direction, and an operating rod 19 is provided on the shaft 18 so as to swing right and left. One end 19a (front end) of the operating rod 19 projects outward from the opening 15 in the distal end wall of the nose portion 2 and engages with the convex portion 17 of the guide member 14.
b (rear end roller) is urged by a spring 20 so as to be constantly pushed outward, and the nose holder 1
Are engaged with a guide groove 21 formed in the longitudinal direction of the inner wall. As shown in FIGS. 2 and 3 (a), the guide groove 21 has a shallow groove 21a in the thickness direction of the inner wall through an inclined surface 22.
And the rear end 1 of the operating rod 19
Reference numeral 9b denotes a deep groove portion 21 of the guide groove 21 when the nose portion 2 extends most from the nose holder 1 (in the state of FIG. 3A).
b.

Here, the operation of the screw guide device having the above configuration will be described. Lead screw 4 on chuck jaw 10
When the tip of the nose portion 2 is pressed against the threaded member 23 while the nose portion 2 is held, and the nose portion 2 is pushed into the screw tightening machine main body, the driver bit 5 relatively advances forward and the chuck claw 10 The head screw 4a is engaged with the head groove of the head screw 4a, and the head screw 4a is detached from the connecting band 3a and is pushed forward of the nose portion 2 and screwed into the threaded member 23. In this case, at the beginning of the screwing (in the state of FIG. 3A), the rear end 19b of the operating rod 19 is in the deep groove portion 21b of the guide groove 21, so that the guide member 14 closes the open portion 16. Then, as the nose portion 2 moves as shown in FIGS. 4A and 5A, the rear end 19b of the operating rod 19 is
0, slides along the shallow groove portion 21a from the deep groove portion 21b, the operating rod 19 swings, and its front end escapes laterally from the convex portion 17 of the guide member 14, and the guide member 14 is biased by a spring. 4 (b) and 5 (b) to retreat from the screw passage 9b.

When the nose portion 2 is separated from the material to be screwed after being screwed in, the nose portion 2 is extended by the spring 6.
Is sent for one screw. Then, at the moving end, the rear end 19b of the operating rod 19 moves from the shallow groove portion 21a of the guide groove 21 to the deep groove portion 21b.
4 (a) and 3 (a), the front end of which swings the guide member 14 as shown in FIGS. 5 (b), 4 (b) and 3 (b).
The opening part 16 is closed by rotating as described above. Guide member 1
When the opening 4 closes the opening 16, the leading screw 4 of the connecting screw 3
is rotated so as to feed the opening a 16 of the chuck claw 10, and finally one side of the guide member 14 reaches a position at which the opening 16 of the chuck claw 10 is closed. As a result, the three sides (upper side and both sides) of the peripheral surface of the screw 4a are closed by the chuck pawl 10, the remaining opening 16 is closed by the guide member 14, and the leading screw 4a is held in the chuck pawl 10. Immediately after screwing, the leading screw 4a is guided by the threaded member 23 while being held, and thereafter the operating rod 19 swings in the opposite direction again, and the guide member 14 is retracted from the screw passage as described above. To rotate.

As described above, the guide member 1 is fed at the time of screw feeding.
4 rotates to guide the leading end of the leading screw 4a to be fed into and held by the opening 16 of the chuck claw 10, and after the screw feeding is completed, the opening 1 of the chuck claw 10 is opened.
6 is closed, and the leading screw 4a held by the chuck claw 10 moves in the direction opposite to the feed direction to guide the screw 4a so as not to roll along the screw passage 9b.

[0020]

According to the first aspect of the present invention, the opening portion of the chuck claw is closed by the guide member at the time of screwing, so that the leading screw is held in the chuck claw and the nose portion is pressed against the surface of the screw-fastened material. It is possible to effectively prevent the top screw from falling down at times and guide the screw so that it is screwed in a correct posture.

Further, since the opening and closing operation of the screw passage by the guide member is linked to the relative movement of the nose portion with respect to the main body of the screw tightening machine, the opening and closing can be automatically performed without any special operation. it can.

According to the second aspect of the present invention, even if the screw next to the screw held by the chuck pawl is bent so as to bend with respect to the connecting band by hitting the screw-fastened material, the screw tip is moved to the chuck pawl. Can be sent reliably.

[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 side view of a main part of the guide device.

3 (a) is a plan view showing a main part of the guide device without details of a feed wheel and the like, and FIG. 3 (b) is a front view of a nose portion showing the guide device.

4A is a plan view showing an operation state of the guide device, and FIG. 4B is a front view showing an operation state of a nose portion showing the guide device.

5A is a plan view showing an operation state of the guide device, and FIG. 5B is a front view showing an operation state of a nose portion showing the guide device.

[Explanation of symbols]

 2 Nose part 3 Connection screw 4a Lead screw 5 Driver bit 9 Guide passage 9b Screw passage 10 Chuck claw 14 Guide member 16 Opening part

Claims (2)

(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 screwdriver for connecting screws, which is supplied between a pair of chuck claws provided to be able to open and close and drives the supplied screws with a driver bit, the supply of the top screws of both chuck claws in a closed state is received. Side of the connecting screw guide passage, a screw passage portion for supplying and guiding a screw from the opening portion of the chuck pawl is opened at the tip end surface of the nose portion, and the tip end surface of the nose portion is A guide member that guides the opening screw to open and close the opening portion of the hook claw so that the top screw is held by the chuck claw when it is closed is arranged. A screw guiding device in a screw tightening machine for connecting screws. 2. The screw guide device according to claim 1, wherein the guide member opens and closes along a screw passage.