JPH085026Y2 - Guide device for screw tighteners for connecting screws - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is to attach a magazine containing a connecting screw to a screw tightener using a connecting screw in which screws are held at regular intervals on a long connecting strip. The present invention relates to a guide device that smoothly guides a shaft portion of a connecting screw by the magazine.

(Prior Art and Problems Thereof) In general, a long connecting strip composed of a strip-shaped sheet,
Or, in a screw tightening machine that uses a connecting screw that supports the shaft portion of the screw through a long connecting belt that is formed by folding a wide sheet into a strip shape at regular intervals, the connecting screw is not so long. When using, attach one end of the connecting screw to the connecting band supply mechanism provided on the nose member of the screw tightener,
The other part is free to hang down.

However, the connecting screw is relatively easily bent due to the weight of the screw. Further, since the side edge of the connecting screw is formed with a notch for engaging with the feed claw that constitutes the connecting band feeding mechanism, if the connecting screw is twisted in the middle during screw tightening work, The notch or the shaft portion of the screw is caught in the connecting screw introducing port of the nose member, which causes the supply of the connecting screw to be hindered.

Therefore, the applicant of the present application has proposed a structure in which a magazine having a semi-disc-shaped portion is attached to the screw fastening machine (Actual Kaihei 4-2326).
No. 5). Inside the magazine, a connecting screw guide path for guiding the connecting screw is formed along the peripheral side thereof, and the connecting screw guide path further has a wide connecting band guide portion on the outside and a narrow screw shaft guide portion on the inner side. It consists of and.

According to this structure, the connecting screw is housed and held in the magazine through the opening of the magazine, so that the connecting screw is smoothly fed without twisting.

By the way, as shown in FIGS. 5 (a) and 5 (b), in order to smoothly guide the protruding portion of the connecting belt which cannot be accommodated inside the magazine when it is drawn into the magazine,
An inclined surface 27 is formed in the opening 25 of the screw shaft guide portion 22b. However, when the connecting belt 4 is weak or is made of a relatively thin sheet, the screw shaft portion 28 (a ) May be drawn in an inclined state such as. In this case, the screw shank 28
Engages with the end faces of the edges on both sides of the opening 25 and slides, so that from the state of (a) to the state of (d) around the screw head portion connected to the connecting band 4 as a center. It receives a force to rotate it counterclockwise. There is no problem as long as the screw shaft portion 28 is actually guided to rotate to the state (d) and the screw shaft portion 28 is guided by the screw shaft guide portion 22b. However, since the step surface 22c between the wide connecting band guide portion 22a and the narrow screw shaft guide portion 22b is formed so as to project at right angles inside both side edges of the opening 25, the opening of the opening 25 is formed. A corner portion P is formed on the surface by the step surface 22c and the edge of the opening 25. Therefore, the screw shaft portion 28 is smoothly guided from the state of (a) to the state of (b), but when it reaches the state of (b) with the corner portion P, it hits the step surface 22c. Therefore, further rotation may be blocked, and it may be held as it is at the position of the corner portion (P) as shown in FIG. If the screw 5 is pulled into the connection belt guide portion 22a in this state, the screw shaft portion enters the connection belt guide portion 22a without being guided by the screw shaft guide portion 22b, so that a supply failure of the connection screw occurs and a failure occurs. Was the cause of.

(Object of the Invention) The present invention eliminates the above-mentioned drawbacks, and particularly reduces the frictional resistance when the shaft portion of the connecting screw is introduced into the guide path, so that the shaft portion of the screw can be smoothly guided to the guide path. It is an object of the present invention to provide a guide device for a screw tightening machine for connecting screws.

(Means for Achieving the Purpose) In order to achieve the above-mentioned object, the guide device of the screw tightener for a connecting screw according to the present invention inserts the shaft portion of the screw into the long synthetic resin connecting strip at regular intervals. A screw tightening machine for continuously tightening a held connecting screw, wherein an adapter main body attached to a driver main body for rotationally driving a driver bit, and a relative movement in the adapter main body in the axial direction of the driver bit. A nose member that is movably supported, and a connection band supply mechanism that is provided on the nose member and that supplies the connection screw to the nose member, and the adapter body has a semi-disc shape on the side opposite to the screw driving direction. A magazine having a portion is attached, a connecting screw guide path for guiding the connecting screw is formed inside the magazine along the peripheral side thereof, and the connecting screw guide path is wide on the outside. And a narrow screw shaft guide portion inside, and an opening at one end of the connecting screw guide path is formed so as to face an inlet of the connecting screw formed on the nose member, and the other end is formed. Both side edges of the opening corresponding to the screw shaft guide portion and the connecting band guide portion are formed to have the same width, and the end surface of the screw shaft guide portion is provided with the screw shaft portion of the connecting screw supplied from the other end side opening portion. Is formed as an inclined surface for guiding and guiding, and the start end of the inclined surface is separated from the end surfaces of both end edges of the opening on the other end side by a predetermined distance on the downstream side in the moving direction of the connecting screw, and The end of the guide surface is formed further downstream from the starting end in the moving direction of the screw.

(Operation and effect of the invention) When the screw tightening operation is continuously performed by the screw tightener having the above-described structure, the connecting screw is first housed in the magazine. At this time, the coupling band is accommodated in the coupling band guide portion and the screw shaft portion is accommodated in the screw shaft guide portion. When the screw tightening work is performed in this state, the connecting screw is guided along the connecting screw guide path, so that twisting does not occur in the magazine,
Even if a connecting band having a weak waist is used, the connecting screw can be smoothly and surely supplied without being greatly disturbed during the screw tightening work and disturbing the work.

In addition, the part of the connecting screw that protrudes outside the magazine will be greatly twisted when the screw is tightened with the magazine horizontal.Therefore, when entering the opening of the connecting screw guide path of the magazine, the screw shaft part It contacts the upper edge and slides along the edge. At this time, both end edges of the opening are formed to have the same width, and the start end of the inclined surface is formed at a position separated from the end surfaces of the both end edges by a predetermined distance on the downstream side in the moving direction of the connecting screw. So
Only the edge is formed on the opening surface of the opening. Therefore, when the screw shaft portion rotates around the screw head while sliding on the end edge, it does not engage with the step surface between the coupling band guide portion and the screw shaft guide portion. The rotation of the screw is not hindered on the way.

Since the screw shaft portion only slides along the above-mentioned edge of the opening as described above, the contact area between the screw shaft portion and the magazine is very small, and the frictional resistance when the screw shaft portion slides is also small. Since it is small, the screw shaft does not get caught in the middle of sliding, it rotates and tilts in a natural direction while sliding smoothly, and it comes into contact with the inclined surface on the downstream side and is guided and smoothly guided to the screw shaft guide part. Be induced.

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

1 and 2 show the main parts of the screw tightener.
The screw tightening machine is composed of a driver body 1 and an adapter 2, and continuously tightens the screw by using a connecting screw 3.

The connecting screw 3 is formed by inserting and holding the shaft portion of the screw 5 into the long connecting strip 4 made of synthetic resin at regular intervals.
Include a long strip-shaped sheet and a thin wide sheet that is folded into a rectangular shape to increase rigidity and is formed into a strip shape as a whole.

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

A motor that operates by pulling a trigger (not shown) is arranged in the driver body 1, and a driver bit 8 that is rotationally driven by the motor is provided at the tip of the motor.
Is mounted so as to project.

The adapter body 6 accommodates and holds the driver bit 8 therein, and the base portion thereof is detachably formed by being screwed into the driver bit mounting portion 9 at the tip of the driver body 1.

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 constantly biased by a spring in the protruding direction.

Next, in the nose member 7, the guide groove 12 of the connecting screw 3 formed in the direction orthogonal to the sliding direction of the driver bit 8 is formed.
And a connecting strip feeding mechanism a for feeding the screws 5 on the connecting screws 3 one by one onto the extension of the axis of the driver bit 8 in the nose member 7 in synchronization with the screw tightening operation. The connection belt supply mechanism a uses the relative movement of the nose member 7 and the adapter body 6 to advance the connection screw 3 introduced from the introduction port 12a of the guide groove 12, and the one-way clutch 13 And a feed foil 14 polymerized on this. And FIG. 1 and FIG. 4 (a)
As shown in (b), when the nose member 7 moves backward with respect to the adapter body 6, the sliding shaft 15 of the one-way clutch 13 is guided by the sliding groove 16 of the adapter body 6 and moves. It rotates by a certain angle with the. At this time, the one-way clutch 13 is engaged with the feed wheel 14 to rotate, the pawl 17 of the feed wheel 14 is engaged with the notch 18 of the connecting screw 3 at the time of rotation, and the connecting screw 3 is advanced by one screw. Of. 19 is a check claw.

It is known that the coupling band supply mechanism operates when the nose member 7 moves in the protruding direction, and any mechanism may be used.

With the above configuration, the tip of the nose member 7 is a material to be screwed.
When the nose member 7 is moved in the backward direction by pressing it against the surface of 20, the connecting band supply mechanism a is activated during the backward movement, and the tip screw 5a of the connecting screw 3 is sent to a predetermined position of 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. Further, when the nose member 7 moves in the backward direction, the tip screw 5a projects from the tip of the nose member 7 and begins to be screwed into the threaded material 20, as shown in FIG. 4 (c). Finally,
At the end of its stroke the screw is fully screwed in. After that, by separating the nose member 7 from the material 20 to be screwed, the nose member 7 slides again in the protruding direction with respect to the adapter body 6. At this time, the connection band supply mechanism a of the connection screw 3
, The one-way clutch 13 rotates in the opposite direction by a certain angle, but in this direction the feed wheel 14 does not engage, so the feed wheel 14 does not rotate and the connecting screw 3 is not fed.

Next, as shown in FIGS. 1 and 2, 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. . The magazine 21 has a semi-disc shaped part arranged on the opposite side to the screwing direction. Inside the magazine 21, as shown in FIG.
A connection screw guide path 22 for guiding the connection screw 3 is formed along the circumferential side of 21. This connecting screw guide path is composed of a wide connecting band guide path 22a for accommodating and guiding the connecting band 4, and a narrow screw shaft guide portion 22b for accommodating and guiding the screw shaft portion 28. On the outside, the screw shaft guide portion 22b is arranged on the inside.

Both ends of the connecting screw guide path 22 are opened, and the connecting screw may be inserted and installed from either of the openings 24 and 25, but is supplied from the opening 25 to the opening 24 when used. The opening 24 is provided at the introduction port 12 of the guide groove 12 of the nose member 7.
It is formed to face a.

On the other hand, as shown in FIGS. 2 and 3 (a) and (b), both end edges 26 of the opening 25 where the screw shaft at the other end corresponds to the guide portion and the connecting band guide portion have the same width. Has been formed. The end surface 27 of the screw shaft guide portion 22b is formed as an inclined surface that guides and guides the screw shaft portion 28 of the connecting screw supplied from the opening 25. Moreover, the start end of the inclined surface 27
27a is located at a position separated from the end faces of the both end edges 26 of the opening 25 by a predetermined distance in the supply direction of the connecting screw 4, and the end 27b of the inclined surface 27 is further downstream from the start end 27a in the moving direction of the screw. Is formed in.

When continuously performing the screw tightening work with the screw tightener having the above-described structure, the connecting screw 3 is first housed in the magazine 21. At this time, the connecting belt 4 is connected to the connecting belt guide portion 22a,
The screw shaft portion 28 is housed in the screw shaft guide portion 22b. When the screw tightening operation is performed in this state, the connecting screw 3 is guided along the connecting screw guide path 22, so that no twist occurs in the magazine 21, and even if a connecting band with a weak waist is used,
It is possible to smoothly and reliably supply the connecting screw 3 without swinging greatly during the screw tightening work and not disturbing the work.

Further, since the free end portion 3b side of the connecting screw 3 is initially protruded to the outside of the magazine 21, when the magazine is horizontal and the screw is tightened as shown in FIGS. 3A and 3B, the protrusion portion 3b is formed.
When twisted into the opening 25, the screw shaft portion 28 comes into contact with the upper edge 26 of the opening 25 as shown in FIG. Slide along the rim 26. At this time, both end edges 26 of the opening 25 are formed to have the same width, and the starting end 27a of the inclined surface 27 is separated from the end surface of the both end edges 26 by a predetermined distance on the downstream side in the moving direction of the connecting screw 3. Since it is formed at the position, the above-mentioned opening 25
Only the above-mentioned edge 26 is formed on the opening surface of. Therefore, when the screw shaft portion 28 rotates on the screw head while sliding on the end edge 26, the coupling band guide portion 22a
Since it does not engage with the stepped surface between the screw shaft guide portion 22b and the screw shaft guide portion 22b, the rotation of the screw 5 is not hindered on the way.

As described above, since the screw shaft portion 28 only slides along the edge 26 of the opening 25, the contact area between the screw shaft portion 28 and the magazine is very small, and when the screw shaft portion 28 slides. Since the friction resistance of the screw shaft 28 is small, the screw shaft portion 28 does not get caught in the middle of sliding, rotates and tilts in a natural direction while sliding smoothly, and contacts the inclined surface 27 on the downstream side and is guided and smoothed. Is guided to the screw shaft guide portion 22b.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of a main part of a screw tightener according to the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIGS. FIG. 4 is an enlarged front view of one opening of a connecting screw guide path showing a guide device of a screw shaft portion, as seen toward the opening surface, and a cross-sectional view taken along the line YY,
5 (a), 5 (b) and 5 (c) are explanatory views of the operation of the connecting belt feeding mechanism, and FIGS. 5 (a) and 5 (b) are magazines when the connecting screw is introduced into the connecting screw guide path of the conventional magazine. Front view of the screw introduction opening of the product and its ZZ
It is sectional drawing on a line. Reference symbol a ... Connection belt supply mechanism, 1 ... Driver body, 2 ...
… Adapter, 3… Connection screw, 4… Connection band, 5… Screw, 6… Adapter body, 7… Nose member, 8… Driver bit, 21… Magazine, 22… Connection screw guide path , 22a …… Connecting band guide part, 22b …… Screw shaft guide part,
24, 25 …… Opening, 26 …… Edge, 27 …… Inclined surface, 28 ……
Screw shaft

Claims (1)

[Scope of utility model registration request] 1. A screw tightening machine for continuously screwing a connecting screw having a shaft portion of the screw inserted and held at a constant interval in a long synthetic resin connecting belt, the driver bit rotatingly driving 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 coupling band supply mechanism, a magazine having a semi-disc shaped portion on the side opposite to the screw driving direction is attached to the adapter body, and a coupling for guiding the coupling screw along the peripheral side is attached inside the magazine. A screw guide path is formed, the connecting screw guide path is composed of a wide connecting band guide portion on the outer side and a narrow screw shaft guide portion on the inner side, and an opening portion at one end of the connecting screw guide path is formed into the screw guide path. The screw is formed so as to face the inlet of the connecting screw formed in the closing member, and both side edges of the opening corresponding to the screw shaft guide portion and the connecting band guide portion at the other end are formed to have the same width and The end surface of the shaft guide portion is formed as an inclined surface that guides and guides the screw shaft portion of the connecting screw supplied from the opening on the other end side, and the start end of the inclined surface is formed on both side edges of the opening on the other end side. A screw for a connecting screw, characterized in that the end of the inclined guide surface is formed at a position separated from the end face by a predetermined distance on the downstream side in the moving direction of the connecting screw, and the end of the inclined guide surface is further formed on the downstream side in the moving direction of the screw. Guide device for fasteners.