JPH0871936A - Reverse drawing out mechanism for connecting screw in connecting screw fastening machine - Google Patents

Abstract

PURPOSE: To provide a reverse drawing-out mechanism for a connecting screw which is excellent in operating ability and moreover the features of design, and does not strike against another member during working. CONSTITUTION: An engaging pin 19 which can move in a direction for engaging and slipping out of a feed hole 13 on the one side of a feeding wheel is attached to one end of a feed plate 14 to interlock with the movement of a nose part, and a check claw 28 to lock in the claw part 12 of a rotary shaft body 4 is attached to the other side of the feed wheel. The rotary shaft body 4 is located at a position where the one end of the above body 4 usually protrudes from the concave part 9 of the outside of the nose part to make the claw part 12 opposite to the check claw 28, and the engaging pin 19 is allowed to engage in the feed hole 13, and the claw part 12 is shifted to a position where it is not opposite to the check claw 28 by pushing in the one end of the rotary shaft body 4, and a reverse plate 23 provided on the rotary shaft body 4 is thereby engaged with the engaging pin 19, and evacuatedly moved to a position where the plate 23 does not engage in the feed hole 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting screw reverse pulling mechanism for pulling out a connecting screw once mounted on the screw tightening machine in a reverse direction in a screw tightening machine for connecting screws.

[0002]

2. Description of the Related Art Generally, in this type of screw tightening machine, it is necessary to reversely remove the connecting screw once mounted on the screw tightening machine, as in the case of replacing the connecting screw during the screw tightening work. A reverse screw removal mechanism is provided. In the conventional reverse pulling mechanism, as disclosed in Japanese Patent Laid-Open No. 100880/1990, an operating lever is arranged in a screw tightener, and the pulling operation is performed by tilting the operating lever to perform reverse pulling.

However, since the operating lever protrudes from the surface of the screw tightener, the operating lever may hit the material to be hammered in during the work, and when this is a gypsum board, the surface paper may be damaged. It was Also,
The operation lever had poor operability, and the shape protruding from the screw tightener did not give a good design impression.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks, has good operability, does not hit other members during work, and has an excellent design. The purpose is to provide.

[0005]

In order to achieve the above object, a reverse screw removing mechanism of a connecting screw in a screw tightening machine for a connecting screw according to the present invention has the driver at a front portion of a screw tightener main body provided with a driver bit. A nose part that is movable in the axial direction of the bit is provided, and the rotary shaft body is attached to the nose part so as to be movable in the axial center direction, and the feed shaft is rotatably supported by the rotary shaft body. Feed holes are formed at equal intervals in the circumferential direction, and one end of the feed plate that is interlocked with the relative movement of the screw tightener main body and the nose portion is engaged with the feed hole so as to be movable in the disengagement direction. Along with mounting the pin, the rotating shaft body is provided with an engaging means that moves with the rotating shaft body to engage with the engaging pin, and the other side surface of the feed wheel is provided with an outer peripheral surface of the rotating shaft body. Formed continuously The pawl is fitted with a check pawl that can be locked only when the feed wheel rotates in the direction opposite to the feed direction, and the rotary shaft body has a concave surface whose one end is normally formed on the outer surface of the nose portion. Is arranged so as to project from the portion, the claw portion and the non-return claw face each other, and the engaging pin is in a position that allows engagement with the feed hole. When moved in the direction, the claw portion is displaced to a position that does not face the check claw, and the engaging means is engaged with the engaging pin to be retracted to a position that is not engaged with the feed hole. To do.

[0006]

[Function] When the connecting screw once installed is pulled out reversely, the one end of the rotary shaft protruding from the concave surface of the side of the nose is pushed in the axial direction, and the claw of the rotary shaft is moved to the feed wheel. The engaging means that moves to a position that does not face the check claw and moves with the rotary shaft at the same time engages the engaging pin and retracts the engaging pin to a position that does not engage the feed hole. Therefore, the feed wheel is free to rotate both in the feed direction and in the opposite direction, so that the connecting screw can be pulled out in the opposite direction to the mounting direction while reversing the feed wheel.

When the rotary shaft is moved to the original position, the pawl portion again faces the check pawl and returns to the position where the engagement pin is allowed to engage with the feed hole.

[0008]

1 (a) and 1 (b) show a front portion of a screw tightening machine, wherein reference numeral 1 is a screw tightening machine main body, and 2 is a nose portion. The screw tightener main body 1 is provided with a driver bit 3 and a rotation driving mechanism (not shown) for the screw bit, and the nose portion 2 is movable in the axial direction of the driver bit 3 and is attached to a rotary shaft body 4 supported on both left and right side portions. Is provided with a feed wheel 6 for rotatably feeding the connecting screw 5 from the bottom to the top. The feed wheel 6 is configured to be rotatable on only one side.

The nose portion 2 is constantly urged by a spring 7 so as to move forward away from the screw tightener body 1.

The rotating shaft body 4 has a large diameter in the center and small diameters at both ends, and a groove 8 is formed on the peripheral surface of one small diameter portion 4a in parallel with the axial direction. The other small diameter portion 4b of the rotary shaft body 4
Penetrates the side portion of the nose portion 2 and projects from the concave surface portion 9 formed on the outer side surface thereof, and the other end having the concave groove 8 as shown in FIG. 2 is fitted to the bearing portion 10 on the side portion of the nose portion 2. The groove 8 is engaged with the ridge 11. Therefore, the rotary shaft body 4 cannot rotate but is provided so as to be movable in the axial direction. Also,
A ratchet-shaped claw portion 12 is formed in the circumferential direction on the peripheral surface on one side of the large diameter portion 4c.

On the side surface of the feed wheel 6, feed holes 13 are formed at equal intervals in the circumferential direction. As shown in FIG. 3, the wall 13a at the end of the feed hole 13 on the feed side is formed at a right angle to the side surface, and the wall 13b on the opposite side is formed to be inclined. A feed plate 14 is arranged between the screw tightener body 1 and the nose portion 2. A roller 15 axially attached to one end of the feed plate 14 is movably engaged with a guide groove 16 formed on a side portion of the screw tightener body 1 and a guide groove 17 formed on a side portion of the nose portion 2. An engaging pin 19 is slidably provided on the bush 18 at the other end of the feed plate 14. Engagement pin 1
As shown in FIG. 3 in detail, the reference numeral 9 is a head portion 19a formed so as to engage with the feed hole 13, a shaft portion 19b housed in the bush 18, and a space between the head portion 19a and the shaft portion 19b. It is composed of the flange portion 20 provided. The engaging pin 19 slides in the bush 18 to be movable in the engaging / disengaging direction with respect to the feed hole 13, and is constantly kept by the spring 21 arranged between the feed plate 14 and the collar portion 20. It is urged to engage the feed hole 13.
22 is a retainer.

Next, the reverse plate 23 faces the side surface of the feed wheel 6 on the side of the feed hole 13 and the reverse plate 23
The rotary shaft body 4 is rotatably supported in contact with the step portion 24 between the large diameter portion 4c and the small diameter portion 4a. A part of the reverse plate 23 bulges out, and as shown in FIG. 4, a fitting hole 25 that fits into the head of the engaging pin 19 is formed in the bulging part 23a. Therefore, the reverse plate 23 is guided so that the engagement pin 19 moves along the circumference connecting the feed holes 13. A spring 25 is provided between the reverse plate 23 and the side portion of the nose portion 2.
And the end portion 4b of the rotary shaft body 4 is always biased so as to protrude from the concave surface portion 9 on the other side portion of the nose portion 2. Therefore, the reverse plate 23 is also an engaging means that moves together with the rotating shaft body 4 to engage with the engaging pin 19, and when the rotating shaft body 4 is moved against the spring 25, the reverse plate 23 also moves at the same amount. The engaging pin 19 is engaged with the collar portion 20 of the engaging pin 19 to move the engaging pin 19 against the spring 21 to a position where it cannot engage with the feed hole 13.

Further, as shown in FIG. 5, a concave portion 26 is formed on the opposite side surface of the feed wheel 6, and the concave portion 2 is formed.
6 is provided with a support shaft 27, and the support shaft 27 has a check claw 2
8 is rotatably attached. The check claw 28 is arranged at a position corresponding to the claw portion 12 of the rotary shaft body 4, and the recess 26
It is urged by a spring 29 provided in the so as to engage with the claw portion 12 of the rotary shaft body 4. A cover plate 30 for pressing the check claw 28 is superposed on the side surface of the feed wheel 6. Therefore, when the rotating shaft body 4 is moved as described above, the claw portion 12 moves to a position that does not face the check claw 28.

In the above structure, normally, as shown in FIGS. 1 (a) and 1 (b), the end 4b of the rotary shaft body 4 projects from the concave surface portion 9 formed on the outer surface of the nose portion 2, and the claw portion 12 and Check claw 28
Are opposed to each other and are in a position that allows the engagement pin 19 to engage with the feed hole 13. So, when tightening the screw,
When the screw tightener main body 1 is pushed forward and the tip of the nose portion 2 is pressed against the material 31 to be screwed, the nose portion 2 moves relatively rearward as shown in FIGS. The roller 15 at one end of the feed plate 14 is guided by the guide groove 17 of the nose portion 2 and the inclined short groove portion 16a of the guide groove 16 of the screw tightener main body 1 to move in association with the relative movement.
Since the amount of movement of the nose portion 2 in the moving direction is smaller than the amount of movement of the nose portion 2, the engagement pin 19 at the other end of the feed plate 14 engages the feed wheel 6 with the feed hole 6 engaged with the feed hole 6. It will be pressed against the side opposite to the moving direction of the nose part 2. For this reason, the feed wheel 6 has one screw of the connecting screw 5 in the feed direction, and
It rotates by the rotation angle that corresponds to feeding in the extension direction of the axis. When the screw tightener main body 1 is further pressed forward, the driver bit 3 engages with the fed screw and is screwed into the material 31 to be screwed while rotating. At this time, the roller 15 of the feed plate 14 moves along the long groove portion 16b of the guide groove 16.

When the screw tightener is released from the screw after screwing in, the nose portion 2 is returned to the original position by the spring 7, so that the roller 15 of the feed plate 14 finally reaches the guide groove 17 of the nose portion 2 and the screw tightener. The guide pin 16 of the main body 1 moves while being guided by the inclined short groove 16a, but is smaller than the moving amount of the nose portion 2 in the moving direction. Therefore, the engaging pin 19 of the feed plate 14 is a spring as shown in FIG. 21. While moving backward against 21, it moves along the inclined surface of the feed hole 13, and after being detached from the feed hole 13, it is guided by the reverse plate 23 so as to move around the rotation axis, and the next feed is performed. After moving to the hole 13, the spring 21 engages the feed hole 13 to prepare for the next feed.

Next, when the connecting screw 5 once installed is pulled out reversely, as shown in FIG. 7, the end portion 4b of the rotary shaft body 4 protruding from the concave surface portion 9 is pushed in the axial direction against the spring 25. Manipulate. As a result, the claw portion 12 moves to a displaced position that does not face the check claw 28, and at the same time, the engaging pin 19 is moved by the reverse plate 23 that moves together with the rotary shaft body 4.
Is retracted against the spring 21 so as not to engage with the feed hole 13. Therefore, the feed wheel 6 is free to rotate both in the feed direction and in the opposite direction, so that the connecting screw 5 can be pulled out in the opposite direction to the mounting direction while rotating the feed wheel 6 in the reverse direction.

When the pushing force against the rotary shaft body 4 is released, the rotary shaft body 4 moves to the original position by the elastic force of the spring 25, the pawl portion 12 again faces the non-return pawl 28, and at the same time, the reverse plate 23 also becomes the original. To the position allowing the engagement pin 19 to engage with the feed hole 13.

[0018]

[Effects] According to the present invention, the feed wheel can be freely rotated by merely pressing and moving the rotary shaft in the axial direction,
Since the connecting screw can be pulled out backwards, the operation is easy.

Further, since the operating-side end of the rotary shaft is constructed to project from the concave surface of the side of the nose, it can be formed so as not to project from the side surface of the nose. Therefore, it is possible to effectively prevent an unexpected accident in which the rotary shaft collides with the material to be screwed in during the work.

Further, since the end portion of the rotary shaft body only protrudes from the concave surface portion, it is not conspicuous, so that the entire design is not spoiled.

[Brief description of drawings]

1 (a) and 1 (b) are a plan view and a side view of a connecting screw reverse removal mechanism of a connecting screw screw tightener according to the present invention.

FIG. 2 is an explanatory view of a bearing aspect of a rotating shaft body.

FIG. 3 is an explanatory view of a manner of detaching an engagement pin from a feed hole.

FIG. 4 is an exploded perspective view of a main part of the reverse extraction mechanism.

FIG. 5 is an explanatory view of a reverse rotation prevention mode by a check claw.

6A and 6B are a plan view and a side view showing a screw feeding mode.

FIG. 7 is a plan view of the reverse pulling mechanism in operation.

[Explanation of symbols]

 1 Screw Tightening Machine Main Body 2 Nose Part 3 Driver Bit 4 Rotating Shaft Body 6 Feed Wheel 9 Concave Surface Part 12 Claw 13 Feed Hole 14 Feed Plate 19 Engagement Pin 23 Reverse Plate (Engagement Means) 28 Check Claw

Claims (1)

[Claims] 1. A nose portion that is movable in the axial direction of the driver bit is provided at the front of a screw tightener main body provided with a driver bit, and a rotary shaft body is attached to the nose portion so as to be movable in the axial center direction thereof. The feed shaft is rotatably supported on the rotating shaft, and feed holes are formed at equal intervals in the circumferential direction on one side of the feed wheel, and the feed plate is linked to the relative movement between the screw tightener body and the nose part. An engaging pin that is movable in the engaging / disengaging direction with respect to the feed hole is attached to one end, and an engaging means that moves with the rotating shaft to engage with the engaging pin is attached to the rotating shaft. The other side surface of the feed wheel is provided with a claw portion which is continuously formed on the outer peripheral surface of the rotary shaft body and can be locked only when the feed wheel rotates in a direction opposite to the feed direction. Attach the pawl and rotate the above The body is usually arranged such that one end thereof projects from the concave surface portion formed on the outer surface of the nose portion, the claw portion and the check claw are opposed to each other, and the engagement pin engages with the feed hole. Is allowed to move, and when the one end is pushed in to move in the axial direction, the claw portion is displaced to a position not facing the check claw, and the engaging means is engaged with the engaging pin. A reverse screw removing mechanism for a connecting screw in a screw tightening machine for connecting screws, characterized in that the connecting screw is retracted and moved to a position not engaged with the feed hole.