JPH0760655A - Continuous screw tightening machine - Google Patents

Abstract

(57) [Abstract] [Purpose] In a continuous screw tightening machine, by reliably pressing the screw continuous body with a proper force, the screw continuous body shakes when the screw is screwed in or when the screw continuous body is fed. To prevent the same and smooth the feeding. [Structure] Two screws 1 in the screw continuous binding body are provided as a vibration preventing means 40 for pressing the screw continuous binding body against a head 16 which supports a leading portion of the continuous screw binding body 13 and preventing the vibration thereof.
A pressing member 45 that elastically presses 7, 7 at two points on the tip end side and the head side is provided, and a recess for fitting the screw is formed at the contact portion of the pressing member 45 with the screws 17, 17. did.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous screw tightening machine used when, for example, a building material is tightened with screws at a construction site.

[0002]

2. Description of the Related Art A continuous screw tightening machine of this type is conventionally known, as described in, for example, Japanese Patent Publication No. 1-58029. As shown in FIGS. 8 and 9, such a continuous screw tightening machine generally protrudes forward from the machine body 1 and a screw screwing bit 2 driven and rotated by an electric motor in the machine body 1 and protruding from the machine body 1. A tightening head 4 attached to the ends of a pair of expandable shafts 3 is provided, and a large number of screws 6 are attached to a synthetic resin tape 7 on a base 4a of the tightening head 4 at regular intervals. By supporting the screw continuous binding body 5 that is held and pushing the machine body 1 toward the target object 8 with the tip of the base 4a pressed against the target object 8, the bit 2 is advanced to move the base. 4a
The screw 6 in the upper groove 4b is engaged, and the screw 6 is pushed out and screwed into the object 8. When the screwing is finished and the machine body 1 is retracted, the screw continuous body 5 is not shown. 1 pitch is fed by the screw continuous binding mechanism,
The next screw 6 is fitted in the groove 4b and stands by.

When the screw 6 is screwed into the base 4a by the bit 2 or when the screw continuous binding body 5 is fed by the feeding mechanism, the continuous screw binding body 5 is shaken left and right to make a screwing error or a feeding error. A holding lid 9 is provided in order to prevent the occurrence of such problems.

However, since the lower surface of the conventional pressing lid 9 is flat and the lower surface of the pressing lid 9 presses the synthetic resin tape 7 of the screw continuous binding body 5 from above, the screw continuous binding body 5 is pressed. It was difficult to completely prevent the left and right shake of the.

The pressing lid 9 can be opened upward so as not to get in the way when the screw continuous binding body 5 is set on the base 4a, but it is not shown when the screw coupling body 5 is being pressed. The mechanism prevents it from freely moving up and down, and the upper surface of the synthetic resin tape 7 in the screw continuous binding body 5 is not a completely smooth surface and is upward at the position where the screw is held. Since it is raised and has unevenness, the sliding resistance between the pressing lid 9 and the synthetic resin tape 7 at the time of feeding the screw continuous binding body 5 is large, which makes the feeding of the screw continuous binding body 5 unsmooth or causes the continuous screw binding. It was also a cause of the body 5 swinging.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to reliably press the screw continuous body with a proper force to prevent the screw continuous body from swinging when the screw is screwed in or when the screw continuous body is fed. It is to provide a continuous screw tightening machine which prevents the above-mentioned troubles and makes the feeding smooth.

[0007]

In order to solve the above problems, the continuous screw tightening machine of the present invention has a large number of screws fixed on a synthetic resin tape at the tip of a machine body provided with a handle for screwing in. A head that supports the leading portion of the screw continuous binding body that is held at intervals, and can be driven and rotated by an electric motor that is built into the machine body for screwing the leading screw of the screw continuous binding body that is supported by the head onto an object. And a screw continuous bit feeding mechanism, in which the head interlocks with the screw screwing operation by the bit to feed the continuous screw body one pitch at a time, and prevents the shake by pressing the continuous screw body to prevent shake. The shake preventing means has a pressing member that elastically presses at least one screw in the screw continuous binding body at a plurality of points on the tip end side and the head side, and the pressing member has a pressing member. That the bis contact portion between the screw is characterized in that it is provided recesses for fitting.

[0008]

When the tip of the head is pressed against the object and the machine body is pressed toward the object in this state, the bit advances and engages with the head screw of the screw continuous binding body, and the screw is taped. And push it forward and screw it into the object.
When the machine body is separated from the object after the screwing is completed, the bit retracts and the screw continuous binding body feed mechanism feeds the screw continuous binding body one pitch, and the next screw occupies the standby position for screwing.

In the screw continuous binding body, at least one screw is pressed and held by the pressing member of the shake preventing means at a plurality of points on the tip end side and the head side while being fitted in the recesses of the pressing member. Therefore, the screw continuous binding body is always held at an appropriate and constant position, and when the screw is screwed by the bit, the bit can surely engage with the head of the head screw of the screw continuous binding body. However, even if a large force acts on the screw continuous binding body when the screw is peeled off from the synthetic resin tape, the subsequent screw is pressed while being fitted in the concave portion of the pressing member. Does not swing and no screwing error occurs.

Further, when the screw continuous binding body is fed after screwing is completed, the pressing member elastically presses the screw with an appropriate force, so that the screw can push up the pressing member and move. Feeding of the screw continuous body is smoothly performed. In addition, the screw connected body that has been sent is reliably held at the position advanced by one pitch by the subsequent screw fitting into the recess of the pressing member, and the sending accuracy is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the drawings. The continuous screw tightening machine shown in FIGS. 1 and 2 has a machine body 10 containing an electric motor. A handle 11 that can be gripped with one hand and a switch 12 that can be operated while holding the handle 11 are provided on the rear portion, and a case 14 that accommodates a screw continuous binding body 13 is provided on the side surface of the machine body 10. A case mounting portion 15 for detachably mounting is provided, and a head 16 for supporting and feeding the screw continuous binding body 13 pulled out from the case 14 and a screw supported by the head 16 are provided at a tip portion of the machine body 10. A screwing bit 18 (see FIG. 6) for screwing the head screw 17 of the continuous binding body 13 into an object, which is driven by the electric motor and is rotatable.
It has and.

The screw continuous binding body 13 is made by holding a large number of screws 17 on a tape 13a made of synthetic resin at a constant interval, and is housed in the case 14 in a spiral shape, and the tip portion thereof is the case 14. And is supported by the head 16.

The head 16 is provided at the tip of a pair of shafts 20 and 20 which project from the machine body 10 in a stretchable manner and are urged by a spring in the extension direction. When the screw 17 is screwed in, the tip of the head 16 is screwed. By pushing the machine body 10 in the direction of the target object 21 with the portion pressed against the target object 21, the shafts 20 and 20 are shortened and the bit 18 is advanced to push out the screw 17 at the head of the screw continuous binding body 13. The screw continuous binding body 13 is interlocked with the screwing operation by the screw continuous binding body feeding mechanism provided in the head 16 and is orthogonal to the screwing direction, that is, the arrow a direction. It is configured to be sent by 1 pitch at a time.

As is apparent from FIGS. 3 to 6, the head 16 has a base 23 having a slightly tapered shape for mounting the screw continuous binding body 13, and the bit at the center of the upper surface of the base 23. An arcuate groove 24 into which the screw 17 at the head of the screw continuous binding body 13 is fitted is provided in a front position of the bit 18 in the axial direction of the bit 18. The groove 24
Serves as a standby portion for holding the screw 17 that has been inserted into the object 21 until it is screwed into the object 21, and functions as a guide when the screw 17 is screwed into the bit 18. Further, a clearance groove 25 into which the head 17a of the screw 17 is fitted is provided at a position closer to the machine body 10 on the upper surface of the base 23, and a position of the groove 24 from the side end portion on the side where the screw continuous binding body 13 is fed. Cut down to
The head 17a of each screw 17 when the screw continuous body 13 is sent.
Is designed to move in the escape groove 25, and when the head screw 17 is fitted into the recess groove 24, its head 17a just abuts on the back wall of the escape groove 25 and is supported at that position. It is like this.

In order to hold the screw 17 in the groove 24 and regulate the swing of the screw 17, a screw position regulating means is provided. The screw position regulating means has a first holding member 27 that holds the tip side of the screw 17 and a second holding member 28 that holds the head side.

On the side of the first holding member 27 opposite to the base 23 with respect to the screw 17 (upper side of the screw), the base end portion is supported by the support block 30 on the base 23 and the support shaft 3 is provided.
By being pivotally supported by 1, centering around the support shaft 31,
The screw 17 is mounted so as to be rotatable in a plane parallel to the axis of the screw 17 and perpendicular to the base 23, and is compressed between a contact portion 27a at the tip of the holding member 27 and a spring seat 30a protruding from the support block 30. The contact portion 27a is urged toward the base 23 side by the provided spring 32, and the lower surface of the contact portion 27a has a groove 24 on the base 23 from the side end portion on the side where the screw 17 is fed. The step portion 33 is formed at a position corresponding to, and the contact portion 27a at the rear end portion of the step portion 33 abuts on the upper surface of the screw 17 fed into the groove 24 and the side surface on the front side in the feeding direction. It comes in contact with and holds the screw 17.

The second holding member 28 extends in a direction orthogonal to the first holding member 27, and the base end portion of the second holding member 28 is pivotally supported by the block 35 by the support shaft 36, whereby the screw 1
7 is attached so as to be rotatable in a plane perpendicular to both the axis of 7 and the base 23, and is biased downward by a spring (not shown). It holds the upper surface near the portion 17a and the side surface opposite to the side held by the first holding member 27.

When the screw 17 in the groove 24 is screwed into the target by the bit 18, the holding members 27 and 28 are pushed up against the biasing force of the spring by the screw 17 and the bit 18 and screwed. There is no obstacle to. In particular, since the first holding member 27 holds the tip of the screw 17 near the object 21, the screw 17 can be held securely until the screw 17 is screwed to some extent, and further, The first holding member 27
Are attached so as to rotate in a plane parallel to the axis of the screw 17 and perpendicular to the base 23. Therefore, when the leading screw 17 of the screw continuous binding body 13 is fed into the concave groove 24, Even when the contact portion 27a of the holding member 27 moves up and down when the screw 17 is screwed into the object 21, the force in the direction orthogonal to the axis of the screw 17 does not act on the screw 17. The screw 17 can be screwed straight into the object 21 without causing the screw 17 to swing.

Unlike the first holding member 27, the second holding member 28 is mounted so as to rotate in a plane orthogonal to the axis of the screw 17, but is located in the groove 24. Since the head of the screw 17 is supported by abutting against the inner wall of the escape groove 25, even if a force in a direction orthogonal to the axis is applied to the screw 17 by the second holding member 28, the force is not applied to the screw 17. The force is in the direction of pressing the head against the inner wall of the escape groove 25, and therefore the screw 17 does not tilt.

The screw continuous binding body feeding mechanism for feeding the screw continuous binding bodies 13 one pitch at a time in conjunction with the screwing operation by the bit 18 is a link mechanism (not shown) built in the lower portion 23b of the base 23 of the head 16, and the link mechanism. It is composed of a feed pawl 38 (see FIG. 5) driven by the machine and an actuating member 39 provided at the tip of an arm 10a integrated with the machine body 10. When the screw 17 is screwed, the machine body 10 is attached to the object 21. When pushed close to each other, the operating member 39 moves forward to operate the link mechanism, so that the feeding claw 38 moves to a position passing over the second screw 17 of the screw continuous binding body 13 while lowering its posture in FIG. When the machine body 10 is separated from the object 21 after the screwing is completed, the actuating member 39 retracts to restore the link mechanism, and thus the feed pawl 3
8 engages with the second screw 17 and sends the screw to a position where it is fitted into the concave groove 24 on the base 23, and holds the engaged state as it is. As the screw continuous body feeding mechanism, a structure generally used in a continuous screw tightening machine of this kind as disclosed in Japanese Patent Publication No. 1-58029 can be used.

On the base 23 of the head 16, vibration preventing means 40 for pressing the screw continuous binding body 13 to prevent the vibration is provided. The shake prevention means 40 holds the top screw 17 of the screw continuous binding body 13 and prevents the shake from occurring by the screw position restricting means, but presses the screws 17 located at the second and subsequent positions. The screw continuous binding body 13 is prevented from swinging.

As shown in FIGS. 3, 4, 5, and 7, the shake preventing means 40 has the support shaft 4 on the base 23.
A U-shaped holder 43 having two vertically long holes 44 on each of the left and right side walls is integrally fixed to a substrate 41 that is rotatably mounted around 2, and a screw 17 is attached to the holder 43. The holding member 45 that abuts is held vertically movable by fitting both ends of two pins 46 attached to the holding member 45 into the elongated holes 44, and these holders 43 are held.
By compressing a spring 47 between the pressing member 45 and the pressing member 45, the pressing member 45 is elastically biased downward, that is, in the direction of contacting the screw 17, and the pressing member 45 is
By the left and right side pieces 45a, 45a, the two screws 1 located at the second and third positions from the beginning in the screw continuous binding body 13
7, 17 are configured to be pressed at two points on the front end side and the head side that sandwich the synthetic resin tape 13a, and the contact portions of the lower edges of the both side pieces 45a, 45a with the screw 17 are: Recesses 48 into which the screws fit are formed respectively.

The shape of the concave portion 48 is arbitrary, but it is basically preferable that the concave portion 48 has an arc shape or a shape similar thereto, and more preferably, a force in the direction opposite to the feed direction acts on the screw continuous binding body 13. In this case, the screw 17 is locked in the recess 48 to prevent the screw continuous body 13 from moving or swinging, and when the screw connecting body 13 is fed, the screw 17 smoothly escapes from the recess 48 and can move forward. Therefore, in the embodiment, the shape of the recess 48 is, as can be seen from FIG. 5, one edge of the arc-shaped recess, that is, the screw coupling body 13.
The edge on the front side in the feeding direction is formed so as to be continuous with the lower edge of the pressing member while gently inclining.

The substrate 41 has screws 1 as shown in FIG.
In the state in which 7 is being held, the screw 50 attached to the base 23 constrains it in that state, and it can hardly rotate up and down. However, when setting the head portion of the screw continuous binding body 13 on the head 16, By sliding along the support shaft 42 to the position where it is disengaged from the screw 50, it can be rotated to the state shown by the chain line in FIG. 7. Note that reference numeral 51 in the figure denotes a spring that biases the substrate 41 to a position corresponding to the screw 50. In the illustrated example, two screws 17, 1 in the screw continuous binding body 13 are held by the pressing member 45.
Although 7 is pressed, only one second screw may be pressed.

With the continuous screw tightening machine having the above structure, screw 1
When screwing in 7, the tip portion 23a of the base 23 is pressed against the target object 21, and in this state, the machine body 10 is pressed toward the target object 21. As a result, the shafts 20 and 20 are shortened and the bit 18 moves forward, engages with the head screw 17 of the screw continuous binding body 13 in the groove 24, disengages the screw 17 from the tape 13a, and moves forward. It is pushed out and screwed into the object 21.

The bit 18 may rotate immediately when the switch is turned on, but by connecting the bit 18 to the electric motor through an appropriate clutch mechanism, the screw 17 is pushed forward and the object 21 is pressed. When I stabbed in
As a reaction force, a rearward force in the axial direction acts on the bit 18 to connect the clutch, and the bit 18 is preferably driven and rotated by an electric motor.

When the machine body 10 is separated from the object 21 after the screwing is completed, the shafts 20 and 20 are extended and the bit 18 is retracted, and the screw continuous binding body feeding mechanism feeds the screw continuous binding body 13 one pitch, and The screw 17 is fed into the groove 24 and is in a standby state for screwing.

Here, in the screw continuous binding body 13, the head screw 17 is held in the groove 24 by the first holding member 27 and the second holding member 28 of the screw position restricting means, and at the same time, the second screw The third and third screws 17,17
Since the vibration is prevented by being pressed by the pressing member 45 of the shake preventing means 40, the leading screw 17 is pushed straight by the bit 18 without being shaken and is screwed straight into the object 21. Become. Particularly, in the shake preventing means 40, the two screws 17, 17 are pressed and held by the pressing member 45 in a state of being fitted in the recesses 48 at two points on the tip side and the head side, respectively. Since the screw continuous binding body 13 is always held in an appropriate position, therefore, when the screw is screwed by the bit 18, the bit 18 surely engages with the head portion 17a of the screw 17 at the head of the screw continuous binding body 13. Not only can the screw 17 be obtained, but even when a large force acts on the screw continuous binding body 13 when the screw 17 is peeled off from the synthetic resin tape 13a, the screw 17 pressed by the pressing member 45 engages with the recess 48 and the screw continuous binding is performed. Since swinging of the body 13 is prevented, screwing error does not occur.

When the screw binding body 13 is fed after screwing, the pressing member 45 elastically presses the screw 17 with an appropriate force by the spring 47, so that the screw 17 pushes up the pressing member 45. It is possible to move forward, and therefore the screw continuous binding body 13 is smoothly fed. Moreover,
The screw connecting body 13 includes the second and third screws 17
By being fitted into the concave portion 48 of the pressing member 45, the leading screw 17 can be held in the concave groove 24 at a position facing the bit 18 at all times because the lead screw 17 is accurately held at a position advanced by one pitch. .

[0030]

As described above, according to the present invention, the pressing member provided with the recessed portion elastically presses the screw at a plurality of points on the tip end side and the head side, thereby reliably preventing the continuous screw body from swinging. At the same time, the feeding can be smoothed, and thereby screwing mistakes of the screw, feeding mistakes of the screw continuous binding body, etc. can be eliminated.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a continuous screw tightening machine according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged view of a main part in FIG.

FIG. 4 is a plan view of FIG.

FIG. 5 is a front view of FIG.

6 is a cross-sectional view taken along the line AA in FIG.

7 is a cross-sectional view taken along the line BB in FIG.

FIG. 8 is a partial plan view of a conventional continuous screw tightening machine.

9 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 10 machine body 11 handle 13 screw connecting body 13a tape 16 head 17 screw 18 bit 21 object 40 shake preventing means 45 pressing member 48 recess

Claims (1)

[Claims] 1. A head for supporting a head portion of a screw continuous binding body in which a large number of screws are held at a constant interval by a synthetic resin tape at a tip end portion of a machine body provided with a handle for screwing operation, and the head. It is equipped with a screwing bit that can be driven and rotated by an electric motor built into the machine body for screwing the head screw of the supported screw continuous binding body into an object, and the head is interlocked with the screw screwing operation by the bit. The screw continuous binding body feed mechanism that feeds the screw continuous binding body one pitch at a time, and the vibration preventing means that prevents the vibration by pressing the screw continuous binding body, and the vibration preventing means causes at least one screw in the screw continuous binding body to be a tip end. A pressing member that elastically presses at a plurality of points on the part side and the head side, and a concave portion into which the screw fits is provided at a contact portion of the pressing member with the screw.
A continuous screw tightening machine characterized by that.