JPH08118250A - Reverse removing mechanism of connecting screw in screw fastening machine for connecting screw - Google Patents

Abstract

PURPOSE: To obtain a reverse removing mechanism of connecting screw in a screw fastening machine for connecting screw which gives a good workability, never hits the other parts in the working condition, has a simple structure, and has an excellent structure in respect of the design. CONSTITUTION: A wheel rod 4 is provided to project its one end from a recessed surface 10 at the outer side of a nose normally, a claw 13 and a check claw 30 are opposed, and a feed wheel is positioned to permit to engage to a delivery wheel 6. On the other hand, the claw 13 is slipped to the position not opposed to the check claw 30, and the feed wheel is moved to the position not engaged to the delivery wheel 6, by operating to push in one end of the wheel rod 4 so as to move in the axial direction.

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]

The object of the present invention is to solve the above-mentioned drawbacks, to have good operability, and to avoid hitting other members during work.
It is an object of the present invention to provide a connecting screw reverse-pulling mechanism for a connecting screw screw tightener having a simple structure and excellent design.

[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, a wheel rod is attached to the nose part so that it can move in the axial direction, the feed rod of the connecting screw is rotatably supported by the wheel rod, and On the side, a feed wheel that engages with the feed wheel only when it rotates in the feed direction of the connecting screw in conjunction with the relative movement of the screw tightener main body and the nose portion is coaxially overlapped with the feed wheel. On the other side surface of the wheel, the feed wheel rotates in the direction opposite to the feed direction of the connecting screw on the claw portion continuously formed on the outer peripheral surface of the wheel rod. A non-return pawl that can be locked only when the wheel rod is attached is usually arranged so that one end of the wheel rod projects from the concave surface portion on the outer side of the nose portion so that the above-mentioned pawl portion and the non-return pawl are opposed to each other. , The feed wheel is in a position that allows the feed wheel to be engaged, and by pushing the one end to move in the axial direction thereof, the pawl portion is displaced to a position that does not face the check pawl, Further, it is characterized in that the feed wheel is moved to a position where it is not engaged with the feed wheel.

[0006]

[Function] When pulling out the connecting screw once installed, by pushing one end of the wheel rod projecting from the concave part on the outer side of the nose part in the axial direction, the pawl part of the wheel rod is not locked by the feed wheel. It moves to a position that does not face the pawl, and at the same time moves the feed wheel to a position that does not engage the feed wheel. Therefore, the feed wheel is also free to rotate in the opposite direction to the feed 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 wheel rod is moved to its original position, the pawl portion again faces the check pawl and returns to the position where the feed wheel is allowed to engage with the feed wheel.

[0008]

1 and 2 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 the wheel rods 4 supported on both left and right side portions have A feed wheel 6 for feeding the connecting screw 5 from the bottom to the top is rotatably provided.

The nose portion 2 is constantly urged by a spring 7 so as to move forward away from the screw tightener body 1. A feed passage 8 for the connecting screw 5 is formed through the front portion of the nose portion 2 in the up-down direction, and the connecting screw 5 is mounted by being inserted from below the feed passage 8 to above.

The wheel rod 4 has a large diameter in the center and small diameters at both ends, and a key groove 9 is formed at the end of one small diameter portion 4a. The other small diameter portion 4b of the wheel rod 4
Penetrates the side portion of the nose portion 2 and projects from the concave surface portion 10 formed on the outer side portion thereof, and the end portion on the side of the key groove 9 is fitted into the bearing portion 11 on the side portion of the nose portion 2 as shown in FIG. The key groove 9 is engaged with the ridge 12. Therefore, the wheel rod 4
Is not rotatable, but is movably provided in the axial direction. A ratchet-shaped claw portion 13 is continuously formed in the circumferential direction on the peripheral surface on one side of the large diameter portion 4c.

The feed wheel 6 is rotatably supported by the large-diameter portion 4c of the wheel rod 4, and engaging claws 14 that engage with the connecting band 5a of the connecting screw 5 are formed on the outer peripheral surfaces on both sides thereof. . The side surface of the feed wheel 6 is attached so as to be flush with the step surface 15 between the large diameter portion 4c and the small diameter portion 4b of the wheel rod 4. A recess 16 is formed in the center of one side surface of the feed wheel 6, and a wheel plate 17 is fixed in the recess 161. As shown in FIG. 4, nine engaging grooves 18 are formed on the outer surface of the wheel plate 17 at equal intervals. This engagement groove 18 is shown in FIG.
As shown in (a), one end in the circumferential direction is formed at a right angle and the other end is formed in an inclined shape.

A disc-shaped feed wheel 19 is superposed on one side surface of the feed wheel 6. The feed wheel 19 has a small diameter portion 4 at one end of the wheel rod 4.
It is rotatably supported on b and is constantly pressed by the spring 20 against the step surface 15 of the wheel rod 4. Therefore, by moving the wheel rod 4 in the axial direction against the spring force of the spring 20, the feed wheel 19 also moves away from the wheel plate 17.

Further, as shown in FIG. 4, three engaging claws 21 corresponding to the engaging grooves 18 of the wheel plate 17 are formed on the inner surface of the feed wheel 19. Engaging claw 2
One end in the circumferential direction of 1 rises at a right angle as shown in FIG. 5B, and the other end is formed in an inclined shape. Therefore, when the feed wheel 19 rotates in the feed direction of the connecting screw 5, the engaging claw 21 engages with the engaging groove 18 of the wheel plate 17 as shown in FIG.
When (and the feed wheel 6) is rotationally driven and the feed wheel 19 rotates in the opposite direction, the engaging claw 21 is disengaged from the engaging groove 18 of the wheel plate 17 as shown in FIG.

Further, a fitting hole 22 is formed through the feed wheel 19, and a feed rod 27 formed at one end of a feed plate 23 is formed in the fitting hole 22.
Are fitted. The feed plate 23 is arranged between the screw tightener main body 1 and the nose portion 2. A roller 24 is axially attached to the other end of the feed plate 23, and the roller 24 has a first guide groove 25 formed on a side portion of the screw tightener body 1 and a second guide groove 25 formed on a side portion of the nose portion 2. Is movably engaged along the guide groove 26.

Next, as shown in FIGS. 1 and 6, a recess 28 is formed on the opposite side surface of the feed wheel 6, and a support shaft 29 is provided in the recess 28. The check claw 30 is rotatably attached. Check claw 30
Is arranged at a position corresponding to the claw portion 13 of the wheel rod 4, and is biased by the spring 31 provided in the recess 28 so as to be locked to the claw portion 13 of the wheel rod 4. The check claw 30 is locked to the claw portion 13 only when the feed wheel 6 rotates in the direction opposite to the feed direction of the connecting screw 5, and when the wheel rod 4 is moved in the axial direction,
The claw portion 13 is configured to move to a position that does not face the check claw 30. A cover plate 32 for pressing the check claw 30 is superposed on the side surface of the feed wheel 6.

In the above structure, normally, as shown in FIGS. 1 and 2, the end portion 4b of the wheel rod 4 projects from the concave surface portion 10 formed on the outer surface of the nose portion 2, and the claw portion 13 and the check claw 30 are provided. And the engaging groove 18 of the feed wheel 19
Is in a position where it is engaged with the engaging claw 21 of the wheel plate 17. Therefore, in the screw tightening work, when the screw tightener main body 1 is pushed forward and the tip of the nose portion 2 is pressed against the material to be screwed, the nose portion 2 moves relatively rearward, as shown in FIG. The roller 24 at one end of the feed plate 23 moves while being guided by the second guide groove 26 of the nose portion 2 and the inclined short groove portion 25a of the first guide groove 25 of the screw tightener main body 1 in conjunction with the relative movement. Since the amount of movement of the feed plate 23 in the movement direction is smaller than the amount of movement of the nose portion 2, the feed rod 27 at the other end of the feed plate 23 is fitted into the fitting hole 22 of the feed wheel 19, Will be pressed to the side opposite to the moving direction of the nose part 2. Therefore, the feed wheel 19 rotates at a constant rotation angle in the feeding direction of the connecting screw 5. Since the engaging groove 18 of the feed wheel 19 is engaged with the engaging claw 21 of the wheel plate 17, the wheel plate 17 also rotates by the same amount of rotation, and at the same time, the feed wheel 6 also screws the connecting screw 5 in the feed direction. It rotates by the rotation angle that corresponds to sending one. When the screw tightener main body 1 is further pressed forward, the driver bit 3 engages with the delivered screw, and while screwing it, the driver bit 3 is screwed into the material to be screwed. At this time,
The roller 24 of the feed plate 23 moves along the long groove portion 25b of the guide groove.

When the screw tightener is released from the screw after screwing in, the nose portion 2 returns to its original position by the spring 7, so that the roller 24 of the feed plate 23 finally moves to the second guide groove 26 of the nose portion 2. While being guided by the inclined short groove 25a of the first guide groove 25 of the screw tightener main body 1 to move,
Since it is smaller than the moving amount of the nose portion 2 in the moving direction, the feed rod 27 of the feed plate 23 moves to the opposite side this time as shown in FIGS. 1 and 2, and the feed wheel 19 moves to the opposite side to the feeding direction. Reverse. On the other hand, since the check claw 30 is locked to the claw portion 13 of the wheel rod 4, the wheel plate 17 and the feed wheel 6 do not rotate reversely, and the next feed is prepared.

As described above, according to the screw tightening work of pushing the nose portion 2 back into the screw tightening machine main body,
The feed wheel 6 intermittently rotates in the feed direction of the connecting screw 5 to feed the screws of the connecting screw 5 one by one to the nose portion 2.

Next, when pulling out the connecting screw 5 once installed, as shown in FIG. 8, the wheel rod 4 protruding from the concave portion 10 is pushed axially against the spring 20. As a result, the claw portion 13 moves to a shifted position that does not face the check claw 30, and at the same time, the wheel rod 4
At the same time, the feed wheel 19 moves and retreats to a position where the feed wheel 6 is not engaged with the wheel plate 17 of the feed wheel 6. This frees the feed wheel 6 from rotating in the feed direction and vice versa.
While reversing the connection screw 5 in the opposite direction to the mounting direction (Fig. 1
Can be pulled out in the direction of arrow A).

When the pushing force on the wheel rod 4 is released, the elastic force of the spring 20 moves the wheel rod 4 to the original position, and the pawl portion 13 again faces the check pawl 30 and at the same time, the engaging pawl of the feed wheel 19 is engaged. 21 returns to a position that allows it to engage with the engagement groove 18 of the wheel plate 17.

[0021]

According to the present invention, the feed wheel can be freely rotated by simply pushing and moving the wheel rod in the axial direction, and the connecting screw can be reversely pulled out, so that the operation is simple.

Further, the claw portion and the engaging claw are moved integrally with the wheel rod, while the check claw and the engaging groove are formed on the feed wheel side, and the wheel rod is moved in the axial direction. Since the claw portion and the check claw are engaged and disengaged from the engagement groove and the engagement claw at the same time, the number of parts is small, the structure is simple, and further cost reduction can be achieved.

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

Similarly, since the end portion of the wheel rod only protrudes from the concave surface portion, it is not conspicuous and therefore the overall design is not spoiled.

[Brief description of drawings]

FIG. 1 is a plan view of a connecting screw reverse removal mechanism of a connecting screw screw tightener according to the present invention.

FIG. 2 is a side view of a connecting screw reverse removal mechanism of the screw tightening machine for connecting screws according to the present invention.

FIG. 3 is an explanatory view of a bearing mode of a wheel rod.

FIG. 4 is a perspective view of a feed wheel and a feed wheel.

5 (a) and 5 (b) are explanatory views of engagement / disengagement states of an engagement claw and an engagement groove, respectively.

FIG. 6 is an explanatory diagram of a reverse rotation prevention mode by a check claw.

FIG. 7 is a plan view showing a screw feeding mode.

FIG. 8 is a side view of the reverse pulling mechanism when it is operating.

[Explanation of symbols]

 1 Screw Tightening Machine Main Body 2 Nose Part 3 Driver Bit 4 Wheel Rod 5 Connection Screw 6 Feed Wheel 10 Concave Surface 13 Claw 19 Feed Wheel 23 Feed Plate 30 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 wheel rod is attached to the nose portion so as to be movable in the axial direction thereof. The rod supports the feed screw of the connecting screw rotatably, and on one side of the feed wheel, the above operation is performed only when the feed screw rotates in the feed direction of the connecting screw in conjunction with the relative movement between the screw tightener body and the nose part. A feed wheel that engages with the feed wheel is coaxially overlapped, and the feed wheel is connected to a claw portion that is continuously formed on the outer peripheral surface of the wheel rod on the other side surface of the feed wheel. A non-return pawl that can be locked only when rotating in the direction opposite to the screw feed direction is attached. Normally, one end of the wheel rod is a concave surface on the outer side of the nose part. Is arranged so as to project from the claw portion and the non-return claw so as to face each other, and the feed wheel is at a position allowing the feed wheel to engage with the feed wheel, and the one end is pushed to move in the axial direction. By moving the claw portion to a position that does not face the check claw and moving the feed wheel to a position that does not engage with the feed wheel. Removal mechanism.