JP2900982B2 - Reverse pull-out mechanism for connecting screw in screw tightening machine for connecting screw - Google Patents

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.

[0002]

2. Description of the Related Art Generally, in a screw tightening machine of this type, it is necessary to reversely remove a connecting screw once mounted on the screw tightening machine, as in the case of replacing a connecting screw during a screw tightening operation. A reverse pulling mechanism for the connecting screw is provided. As shown in Japanese Patent Application Laid-Open No. 2-100880, a conventional reverse pulling mechanism is configured such that an operation lever is arranged on a screw tightening machine, and the operation lever can be tilted down to perform reverse pulling.

[0003] However, since the operating lever projects from the surface of the screw tightening machine, the operating lever may hit a material to be driven or the like at the time of work, and when this is a gypsum board, there is a case where the paper on the surface is damaged. Was. Also,
In addition to the poor operability of the operation lever, the shape protruding from the screw tightening machine has drawbacks such that a good design cannot be obtained.

[0004]

The object of the present invention is to solve the above-mentioned drawbacks, to improve the operability, not to hit other parts at the time of work,
It is an object of the present invention to provide a reverse connection mechanism of a connecting screw in a connecting screw screwing machine having a simple structure and excellent design.

[0005]

In order to achieve the above-mentioned object, in order to achieve the above object, a mechanism for reversely removing a connecting screw in a screwdriver for a connecting screw according to the present invention comprises the above-mentioned screwdriver provided at the front of a screwdriver body provided with a driver bit. A nose part that can move in the axial direction of the bit is provided, a wheel rod is attached to the nose part so as to be movable in the axial direction, the feed rod of the connecting screw is rotatably supported on the wheel rod, and one of the feed wheels is 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 coordination with the relative movement between the screw tightener body and the nose portion is coaxially arranged and coaxially arranged. On the other side of the wheel, the feed wheel rotates in a direction opposite to the feed direction of the connecting screw on a claw portion continuously formed on the outer peripheral surface of the wheel rod. A non-return claw that can be locked only when the wheel rod is mounted is usually arranged so that one end of the wheel rod protrudes from the concave surface on the outer side of the nose portion. The feed wheel is at a position allowing the engagement with the feed wheel, and the one end is pushed in and moved in the axial direction to shift the claw portion to a position not opposed to the check claw, Further, the feed wheel is moved to a position where the feed wheel does not engage with the feed wheel.

[0006]

[Function] To reverse the connection screw once installed, push one end of the wheel rod that protrudes from the concave part on the outside of the nose part in the axial direction, and the claw part of the wheel rod stops the feed wheel. Move to a position that is not opposed to the pawl, and at the same time move the feed wheel to a position that does not engage the feed wheel. For this reason, since the feed wheel is also free to rotate in the direction opposite to the feed direction, the connecting screw can be pulled out in the direction opposite to the mounting direction while rotating the feed wheel in the reverse direction.

[0007] When the wheel rod is moved to the original position, the pawl portion returns to a position allowing the feed wheel to engage with the feed wheel again, facing the check pawl.

[0008]

1 and 2 show a front part of a screw tightening machine. Reference numeral 1 denotes a screw tightening machine main body, and 2 denotes a nose part. The screw tightener main body 1 includes a driver bit 3 and a rotation driving mechanism (not shown) thereof. The nose portion 2 is movable in the axial direction of the driver bit 3 and has a wheel rod 4 supported on both left and right sides. A feed wheel 6 that feeds the connection screw 5 upward from below is rotatably provided.

The nose portion 2 is urged by a spring 7 so as to always move forward away from the main body 1 of the screw tightening machine. A feed passage 8 for a connecting screw 5 is formed vertically through a front portion of the nose portion 2, and the connecting screw 5 is inserted by being inserted upward from below the feed passage 8.

The wheel rod 4 has a large diameter at the center and a small diameter at both ends, and a keyway 9 is formed at one end of the small diameter portion 4a. The other small diameter portion 4b of the wheel rod 4
Penetrates a side portion of the nose portion 2 and protrudes from a concave portion 10 formed on an outer portion thereof, and an end portion on the key groove 9 side is fitted into a bearing portion 11 on a 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 provided so as to be movable in the axial direction. Further, a ratchet-shaped claw portion 13 is continuously formed in the circumferential direction on one peripheral surface 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 has engagement claws 14 formed on the outer peripheral surfaces on both sides thereof to engage with the connection band 5a of the connection screw 5. . 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 to the recess 161. On the outer surface of the wheel plate 17, nine engaging grooves 18 are formed at equal intervals as shown in FIG. 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 arranged on one side of the feed wheel 6 in an overlapping manner. The feed wheel 19 has a small diameter portion 4 at one end of the wheel rod 4.
b, and is rotatably supported on the wheel rod 4 and constantly pressed against the step surface 15 of the wheel rod 4 by a spring 20. 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 so as to separate from the wheel plate 17.

On the inner surface of the feed wheel 19, three engaging claws 21 corresponding to the engaging grooves 18 of the wheel plate 17 are formed as shown in FIG. Engaging claw 2
One end in the circumferential direction of 1 is raised 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 is rotated in the feed direction of the connection screw 5, the engagement claws 21 are engaged with the engagement grooves 18 of the wheel plate 17 as shown in FIG.
When the feed wheel 19 is rotated and the feed wheel 19 is rotated 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 disposed between the screwdriver body 1 and the nose portion 2. A roller 24 is axially mounted on the other end of the feed plate 23, and the roller 24 has a first guide groove 25 formed on a side of the screwdriver body 1 and a second guide groove 25 formed on a side of the nose 2. Are movably engaged along the guide groove 26.

Next, as shown in FIGS. 1 and 6, a recess 28 is formed on the side surface on the opposite side of the feed wheel 6, and a support shaft 29 is provided in the recess 28. Has a check claw 30 rotatably attached thereto. Non-return claw 30
Is disposed at a position corresponding to the claw portion 13 of the wheel rod 4, and is urged by a spring 31 provided in the concave portion 28 so as to be locked to the claw portion 13 of the wheel rod 4. The non-return claw 30 is engaged with the claw portion 13 only when the feed wheel 6 rotates in the direction opposite to the feed direction of the connection 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 not opposed to the check claw 30. A cover plate 32 for pressing the check pawl 30 is arranged on the side surface of the feed wheel 6 in an overlapping manner.

1 and 2, the end 4b of the wheel rod 4 protrudes from the concave portion 10 formed on the outer surface of the nose portion 2, and the claw portion 13 and the non-return claw 30 are normally provided as shown in FIGS. And the engagement groove 18 of the feed wheel 19
Is at a position where it engages with the engagement claw 21 of the wheel plate 17. Therefore, in screwing work, when the screw tightening machine 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 relatively moves rearward as shown in FIG. In conjunction with the relative movement, 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 screwdriver body 1. Since the amount of movement of the feed plate 23 in the moving 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 Is pressed against the direction opposite to the moving direction of the nose portion 2. For this reason, the feed wheel 19 rotates at a constant rotation angle in the feed direction of the connection 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. Rotate by the rotation angle corresponding to sending one line. When the screwdriver body 1 is further pressed forward, the driver bit 3 engages with the fed screw, and is screwed into the threaded material while rotating the screw. At this time,
The roller 24 of the feed plate 23 moves along the long groove 25b of the guide groove.

When the screw tightening machine is released from the screw after the screwing, the nose portion 2 is returned to the original position by the spring 7, so that the roller 24 of the feed plate 23 finally comes into contact with the second guide groove 26 of the nose portion 2. Although it moves while being guided by the inclined short groove 25a of the first guide groove 25 of the screwdriver body 1,
Since the amount of movement of the nose part 2 in the moving direction is smaller than that of the nose part 2, the feed rod 27 of the feed plate 23 moves to the opposite side as shown in FIGS. Reverse. On the other hand, since the non-return 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 reverse, and the next feed is prepared.

As described above, according to the screw tightening operation 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 out the screws of the connecting screw 5 from the nose portion 2 one by one.

Next, when pulling out the connection screw 5 once mounted, the wheel rod 4 protruding from the concave portion 10 is pushed in the axial direction against the spring 20, as shown in FIG. As a result, the claw portion 13 moves to a shifted position that is not opposed to 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 it does not engage with the wheel plate 17 of the feed wheel 6. As a result, the feed wheel 6 is free to rotate both in the feed direction and in the reverse direction.
The connecting screw 5 is turned in the opposite direction to the mounting direction (FIG. 1).
(In the direction of arrow A).

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

[0021]

According to the present invention, the rotation of the feed wheel becomes free only by pressing and moving the wheel rod in the axial direction, and the connecting screw can be pulled out in reverse, so that the operation is simple.

Also, while the claw portion and the engagement claw are moved integrally with the wheel rod, the check claw and the engagement groove are formed on the feed wheel side, and only by moving the wheel rod in the axial direction, Since the engagement and disengagement of the claw portion and the non-return claw and the engagement groove and the engagement claw are simultaneously performed, the number of parts is small, the structure is simple, and the cost can be further reduced.

Furthermore, since the end on the operation side of the wheel rod is configured to protrude from the concave surface on the outside of the nose, it can be formed so as not to protrude from the side surface of the nose. Therefore, it is possible to effectively prevent an unexpected accident in which the wheel rod hits the threaded material or the like during the operation.

Similarly, since the end of the wheel rod only protrudes from the concave surface, the wheel rod is inconspicuous and does not impair the overall design.

[Brief description of the drawings]

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

FIG. 2 is a side view of a connection screw reverse-pulling mechanism of the connection screw screw tightening machine 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.

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

FIG. 6 is an explanatory view of a mode of preventing reverse rotation by a check pawl;

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

FIG. 8 is a side view when the reverse pulling mechanism is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Screw tightener main body 2 Nose part 3 Driver bit 4 Wheel rod 5 Connecting screw 6 Feed wheel 10 Concave surface part 13 Claw part 19 Feed wheel 23 Feed plate 30 Check nail

Claims (1)

(57) [Claims] 1. A nose portion movable in the axial direction of the driver bit is provided at a front portion of a main body of the screwdriver having the driver bit, and a wheel rod is attached to the nose portion so as to be movable in the axial direction thereof. The rod is used to rotatably support the connecting screw feed wheel. On one side of the feed wheel, the above is only performed when the connecting screw rotates in the feed direction in conjunction with the relative movement between the screwdriver body and the nose. A feed wheel engaged with the feed wheel is arranged coaxially and overlapped, and the other side surface of the feed wheel is connected to a claw portion continuously formed on an outer peripheral surface of the wheel rod. A non-return claw that can be locked only when rotating in the direction opposite to the screw feed direction is attached. The wheel rod usually has one end with a concave surface on the outside of the nose. The claw portion and the non-return claw are disposed so as to protrude from each other, and are located at a position where the feed wheel is allowed to engage with the feed wheel. By moving the feed wheel to a position where it does not engage with the feed wheel, and moving the feed wheel to a position where it does not engage with the feed wheel. Extraction mechanism.