JPH0715735Y2 - Connection screw dropout prevention device for screw tighteners for connection screws - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting screw drop prevention device for preventing a connecting screw from falling out of a magazine of a screw tightener during a screw tightening operation.

[0002]

2. Description of the Related Art Since a connecting band of a connecting screw used in this type of screw tightening machine is not so long, one end of the connecting screw is simply attached to a connecting screw supply mechanism provided in a nose member of the screw tightening machine when used. So most of the other connecting screws are free to hang down. However, the connecting screw is relatively easily bent due to the weight of the screw. Since the free end side of the connecting screw swings freely each time the screw tightening machine is moved, it is a hindrance when working, and twisting easily occurs.

Therefore, in order to prevent the above-mentioned phenomenon, there is known one in which a guide member for a connecting screw is formed on the side surface of the tool (Japanese Utility Model Publication No. 60-26921). This guide member improved the entry to the magazine, but this time, when the rear connecting screw from the guide member enters the guide member, a catching phenomenon occurs, and eventually, the connecting screw is used to some extent. The free end portion of the connecting screw must be gripped with one hand until the flexed state of is reduced, and workability is not improved so much.

[0004]

The object of the present invention is to eliminate the above-mentioned drawbacks, and in particular, the free end side portion of the connecting screw can be sequentially guided to the screw supply mechanism portion of the nose member, and the connecting screw can be installed in any direction in which the screw tightener is tilted. Provide a device to prevent the connecting screw from falling off of the screw tightening machine that prevents the connecting screw from being fed smoothly and prevents the connecting screw from interfering with the screw tightening work by restricting it from moving freely. That is the purpose.

[0005]

In order to achieve the above-mentioned object, a connecting screw dropout prevention device of a screw tightening machine for connecting screws according to the present invention is provided with a shaft of a screw at a constant interval in a long synthetic resin connecting band. A screw tightening machine for continuously tightening a connecting screw having a portion inserted and held, comprising: an adapter main body attached to a driver main body for rotationally driving a driver bit; and an adapter main body in the axial direction of the driver bit. A nose member that is movably supported, and a connection screw supply mechanism that is provided on the nose member and that supplies the connection screw to the nose member. The adapter body is provided on the side opposite to the screw driving direction. A magazine having a semi-disc shaped portion is attached, and a wide connecting band guide path for guiding the connecting band in an arc shape is formed inside the magazine along the outer peripheral side thereof, and the connecting band is formed. A narrow screw shaft accommodating space for accommodating the shaft portion of the screw on the connecting screw is formed in the inner diameter direction of the band guide path, and the connecting screw formed on the nose member is formed at one end of the connecting band guide path. An opening facing the inlet of the connecting screw is formed, and a plurality of recesses are formed on the outer surface of the edge of the opening along the axial direction of the connecting screw, while the edge of the connecting screw is formed. A stopper plate that engages with the shaft portion is mounted, and the stopper plate is made of an elastic material and has a substantially U-shaped cross-section. It is characterized in that it has a locking surface that can be engaged with the shaft portion, and that both ends are formed with hook portions that engage with the edge of the opening and selectively fit into the recess.

[0006]

According to the above structure, when the screw tightening operation is continuously performed by the screw tightener, the connecting screws are housed in the magazine, and the connecting band guide path is formed in a semi-disc shape inside the magazine. Since it is formed in an arc shape along the outer peripheral side of the portion, most of the connecting screws are housed in the magazine. Therefore, even if the connecting screw having a weak stiffness is used, the connecting screw does not greatly swing during the screw tightening work and interferes with the work, and the connecting screw is difficult to be twisted even when the screw tightener is turned sideways. Therefore, it is not necessary for an operator to hold the connecting screw with one hand, and the workability is improved.

When the connecting screw is consumed and the remaining portion in the magazine is reduced and the screw tightener is screwed downward, the connecting screw in the magazine may fall off from the opening due to its own weight. . However, since the shaft portion of the connecting screw engages with the elastic stopper plate at the opening and gives resistance to the withdrawal to restrict the free movement, the dropping of the connecting screw is effectively prevented.

Moreover, the stopper position can be adjusted and set by moving the stopper plate along the screw axis direction of the connecting screw and selectively fitting the tip of the hook portion into one of the recesses. As a result, a proper drop-preventing force is generated according to the length of the screw shaft of the connecting screw to be used, the connecting screw can be reliably prevented from coming off the magazine, and the supply of the connecting screw is not hindered.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows an essential part of a screw tightening machine for connecting screws. The screw tightening machine is composed of a driver body 1 and an adapter 2, and the screw tightening is continuously performed by using the connecting screw 3. It is a thing.

The connecting screw 3 is formed by inserting and holding the shaft portion of the screw 5 in a long synthetic belt 4 made of synthetic resin at regular intervals, and the connecting band 4 is made of a long belt-shaped sheet. There is also a thin wide sheet that is folded to increase its rigidity and is formed into a strip.

The adapter 2 is attached to and detached from the tip of the driver body 1, and comprises an adapter body 6 and a nose member 7 slidably provided on the adapter body 6.

A motor which is operated by pulling a trigger (not shown) is arranged in the driver body 1, and a driver bit 8 which is rotationally driven by the motor is projectingly attached to the tip of the motor.

The adapter body 6 is internally provided with a driver bit 8
And the base of the driver body 1
It is formed so as to be attachable and detachable by being screwed into the driver bit mounting portion 9 at the tip of the.

The nose member 7 is supported so as to be movable relative to the adapter body 6 along the axis of the driver bit 8, and is always biased in the protruding direction. Then, the nose member 7 slides in the backward direction approaching the driver body 1 side,
The adapter body 6 includes the stopper rod 10 and the adjustment ring 11 of the driver bit mounting portion 9 so that the tip of the driver bit 8 housed in the adapter body 6 slightly protrudes from the tip of the nose member 7 at the stroke end. Positioned at the optimum position by and.

The connecting screw supply mechanism utilizes the fact that the nose member 7 and the adapter body 6 relatively move in the retracting direction (or the projecting direction) in synchronization with the screw tightening operation, so that the guide groove 12 is introduced. The screw 5 on the connecting screw 3 introduced from the above is sent one by one onto the extension of the axial center of the driver bit 8 in the nose member 7, and is shown in the specification and drawings relating to Japanese Patent Application No. 2-83570. As described above, the mechanism is well known, and the description thereof is omitted.

With the above construction, when the tip of the nose member 7 is pressed against the surface of the material 20 to be screwed and the nose member 7 is moved in the backward direction, the connecting screw supply mechanism a operates and the tip screw 5a of the connecting screw 3 is moved. It is sent to a predetermined position on the nose member 7. Then, the tip of the driver bit 8 rotationally driven by the motor is engaged with the head groove of the tip screw 5a, and the tip screw 5a is screwed into the material 20 to be screwed. When the nose member 7 is separated from the material 20 to be screwed, the nose member 7 returns in the opposite direction. The above operation is repeated and the connecting screws 3 are sequentially screwed in.

Next, as shown in FIGS. 3 and 4, a magazine 21 for accommodating the connecting screw 3 having a semi-disc shaped portion is provided on the connecting screw supply side of the adapter body 6. There is. The magazine 21 has a semi-disc shaped portion arranged on the opposite side to the screwing direction, and as shown in FIG.
A wide semicircular connecting strip guide path 22 for guiding the connecting strip 4 of the connecting screw 3 is formed along the outer peripheral side of the magazine 21, and the screw 5 is formed in the inner diameter direction of the connecting strip guide path 22.
A narrow screw shaft accommodating space 23 for accommodating the shaft is formed.

An opening 24 facing the inlet of the guide groove 12 of the nose member 7 is formed at one end of the connecting band guide path 22.

Next, as shown in FIG. 1, the opening 24 is formed.
On the outer surface of the end edge 24a, a plurality of recesses 26 are formed in an array along the axial direction of the connecting screw 3. A stopper plate 27 is attached to the end edge 24a. As shown in FIG. 2, the stopper plate 27 is made of an elastic material such as synthetic resin and has a substantially U-shaped cross-section. The stopper plate 27 is disposed in the screw shaft accommodating space 23 at the center. A locking surface 28 that can be engaged with the shaft of the screw is formed. Further, hook portions 29 are formed at both ends of the stopper plate 27. The hook portion 29 engages with the end edge 24a of the opening portion 24, and the tip portion 29a is formed into a shape that fits into the recess 26. The recess 26 into which the tip end surface 29a is fitted depends on the length of the screw shaft portion of the connecting screw 3 and is suitable for sliding the connecting screw 3 by the engagement between the locking surface 28 and the screw shaft portion. The resistance may be selected and determined.

When using the magazine 21 having the above structure, the connecting screw 3 is inserted into the magazine 21. The connecting screw 3 is inserted into the magazine 21 along the connecting band guide path 22, and the shaft portion of each screw 5 is housed in the space portion 23. Then, one end of the connecting screw 3 is taken out from the opening 24 on the one end side of the connecting band guide path 22 and introduced into the guide groove 12 of the nose member 7, and the other free end 3b side is the other end of the magazine 21. It is made to stick out from the opening 25.

When the screw tightening operation of the above-mentioned structure is continuously carried out in the above-described manner, the connecting screw 3 is housed in the magazine 21, and the connecting band guide path 22 has a semi-disc shape inside the magazine 21. Since it is formed in an arc shape along the outer peripheral side of the portion, most of the connecting screw 3 is housed in the magazine 21. Therefore, the connecting screw 3
Even if the above is used, the connection screw 3 can be smoothly and surely supplied without causing a large swing during the screw tightening work and disturbing the work.

At the beginning of the screw tightening work, the free end side of the connecting screw 3 is projected to the outside of the magazine 21. Therefore, when the screw is screwed sideways, it is subjected to the action of gravity in the twisting direction. However, since the length of the protruding portion of the connecting screw 3 is short, twisting is unlikely to occur. Therefore, it is not necessary for an operator to hold the connecting screw 3 with one hand, and the workability is improved.

Further, the connection screw 3 is consumed and the magazine 2
When the screw tightener is screwed downward with the remaining portion in 1 reduced, the connecting screw 3 in the magazine 21 may fall out of the opening 24 by its own weight as shown by the chain line in FIG. There is. However, since the screw shaft portion of the connecting screw 3 engages with the elastic stopper plate 27 at the opening 24 to provide resistance against slipping out and restrict free movement, the connecting screw is effectively prevented from falling off. It

Further, the stopper plate 27 is moved along the screw axis direction of the connecting screw 3 to selectively fit the tip end portion 29a of the hook portion 29 into one of the concave portions 26 to adjust and set the stopper position. it can. as a result,
A proper disengagement prevention force is generated according to the length of the screw shaft of the connecting screw 3 to be used, so that the connecting screw 3 can be reliably prevented from coming off from the magazine 21, and the supply of the connecting screw is not hindered.

[Brief description of drawings]

FIG. 1 is a perspective view of a connecting screw dropout prevention device of a screw tightener for a connecting screw according to the present invention.

FIG. 2 is a perspective view of a stopper plate.

FIG. 3 is a side view showing a main section of a screw tightener according to the present invention in a partial cross section.

FIG. 4 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 a Connection screw supply mechanism 1 Driver body 3 Connection screw 6 Adapter body 7 Nose member 8 Driver bit 21 Magazine 22 Connection band guide path 24 Opening 26 Recess 27 Stopper plate

Claims (1)

[Scope of utility model registration request] 1. A screw tightening machine for continuously tightening a connecting screw in which a shaft portion of the screw is inserted and held at a constant interval in a long synthetic resin connecting band, and a driver for rotating a driver bit. An adapter body attached to the body, a nose member supported by the adapter body so as to be relatively movable in the axial direction of the driver bit, and a connecting screw provided on the nose member and supplied to the nose member. A magazine having a semi-disc shaped portion on the side opposite to the screw driving direction is attached to the adapter body, and the coupling band is arcuate inside the magazine along the outer peripheral side thereof. A wide connecting band guide path is formed, and a narrow screw shaft accommodating space for accommodating the shaft part of the screw on the connecting screw is formed in the inner diameter direction of the connecting band guide path. An opening is formed at one end of the connecting band guide path, the opening facing the inlet of the connecting screw formed in the nose member, and the outer surface of the edge of the opening extends along the axial direction of the connecting screw. While a plurality of recesses are formed in an array, a stopper plate that engages with the shaft portion of the connecting screw is attached to the end edge, and the stopper plate is made of an elastic material and has a substantially cross-sectional shape. It has a letter-like shape and has a locking surface that is disposed in the screw shaft accommodating space at the central portion and that can engage with the screw shaft portion, and that engages with the edge of the opening at both ends and is selected as the recess. A connecting screw drop prevention device for a screw tightening machine for a connecting screw, characterized in that a hook portion that fits together is formed.