JPH06339871A - Automatic screw supply device for screw driver - Google Patents

Abstract

PURPOSE:To simplify constitution of an automatic screw supply device by which screws are fastened continuously by a screw driver by swinging a belt material feeding claw through a cam mechanism, and feeding a belt material having the screws in a row a prescribed pitch by a prescribed pitch to the tip side of a bit. CONSTITUTION:In an automatic screw supply device 2, screws 7 arranged in a row in a belt material 13 are fed intermittently to the tip side of a bit 8 in a screw driver 1, and the screws are fastened to an object 26 to be installed. In this case, in order to feed out the belt material 13 with every prescribed pitch, a belt material feeding claw 9 having a prescribed length is arranged in a screw supply device body 4 through a cam mechanism 10. When the screw driver is pushed in, the belt material feeding claw 9 is swung by a prescribed angle to the bit 8 side, and the belt material 13 is fed intermittently by a prescribed quantity to the tip side of the bit 8. On the other hand, when the screw driver 1 is pulled up, the belt material feeding claw 9 is separated from the belt material 13, and is returned to a former position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic screw feeder for a screw driver in a screw tightening tool.

[0002]

2. Description of the Related Art Conventionally, in order to efficiently tighten a mounting body to a mounting body with a screw, a screw driver is connected to a screw feeder, and a screw having a predetermined length is previously attached to the screw feeder in a line. It is known to feed thin strips of plastic material intermittently so that the screws are tightened continuously.

In the above-mentioned conventional screw feeder, a spool-shaped cylindrical body of a bobbin is installed so as to rotate by a constant angle in the screw feeder which expands and contracts each time the screw driver is pushed in to tighten the screw. Protrusions for intermittent feeding are circumferentially provided at regular intervals on the outer side of the columnar body, and the protrusions are engaged with the feed grooves which are intermittently cut out on both sides of the band material on which screws are attached in a row. The strip material was sent out to the tip side of the bit by a predetermined pitch.

[0004]

However, in the prior art, as described above, the columnar body is made to rotate by feeding the strip material with the screws attached in a row so as to form the columnar body. It takes time and labor, and the manufacturing cost becomes high, and the ratchet mechanism or the like is required for the mechanism for intermittently sending the columnar body, which increases the number of members and makes the entire apparatus expensive. Met.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and in order to solve the above-mentioned problems, it is arranged in a strip on the tip end side of the screw driver bit. In an automatic screw feeder for screw drivers, which is configured to intermittently feed the installed screw and tighten the screw continuously, a band material in which the screw is arranged in a row on the tip side of the bit has a predetermined pitch. In order to feed each band, a strip material feed claw of a predetermined length is arranged on the screw feeder main body via a cam mechanism so that it can swing a predetermined angle, and the tip of the strip material feed claw can be detached from the band material. When the screw driver is pushed in to tighten the screw to the predetermined part, the band feed claw is swung to the bit side by a predetermined angle to lock the tip of the band feed claw to the band. And intermittently feed a predetermined amount of strip material to the tip side of the bit When the screw driver is pulled up from the screw fastened to a predetermined part, the tip of the band feed claw is separated from the band so that the screw feeder can be returned to its original position. The present invention provides an automatic screw feeder for a screw driver.

[0006]

When the automatic screw feeder for the screw driver of the present invention is connected to the screw driver and used,
By swinging the strip feeding pawl to the bit side by a predetermined angle, the tip of the strip feeding pawl is locked to the strip material, and the strip material is intermittently fed to the tip side of the bit by a predetermined amount. It is possible to feed a predetermined amount of band material to the bit side with the band material feeding claw and tighten the screw with the bit material.

Then, after the screw driver is pulled up after tightening the screw, the tip of the band feed claw is separated from the band and disposed in the screw feeder main body so as to be able to return to the original position. With the simple structure that the strip feeding pawl swings back to the original position and swings with the cam mechanism, the screw is continuously fed to the bit side as described above and the screw is fed. Can be tightened.

[0008]

EXAMPLES The present invention will be described below based on examples. FIG. 1 and subsequent figures show one embodiment of the present invention.
As shown in FIG. 1, the screw supply device 2 of the screw driver-1 is configured such that the rear side of the screw supply device main body 4 is slidably inserted through a coil spring 5 into an outer casing 3 having a rectangular tube shape to supply the screw. The device body 4 is arranged so as to be retractable by a predetermined amount against the coil spring 5.

Then, a screw driver-connecting portion 6 is attached to the rear end portion of the outer casing 3 as shown in FIG. 1, and the front end portion of the screw driver-1 is screwed to continuously screw the screw 7 at a predetermined portion. It can be tightened to.

As shown in FIGS. 1 and 2, the screw feeder main body 4 is attached to the screw driver-1 at a substantially central portion thereof so that a slightly long bit 8 is inserted to a predetermined depth. There is.

Then, on the side portion on the tip side of the bit 8,
As shown in FIGS. 1 and 2, a belt material feeding claw 9 having a predetermined length is swingably mounted by a cam mechanism 10 as described below, and a screw 7 inserted along a guide surface 12 of a screw feeding portion 11 is inserted. The strips 13 of plastic material attached in a row can be fed to the bit 8 side at a predetermined pitch.

As shown in FIGS. 1 and 2, the strip material feeding claw 9 has a guide roller 14 pivotally attached to the upper end thereof to form a slightly elongated slot 15 formed in the screw feeder main body 4. Then, the guide roller 16 is pivotally attached to the center portion of the guide body, and the guide roller 16 is fitted into the guide hole 17 having a slightly L-shaped opening in the outer casing 3,
The claw portion 18 at the tip of the strip material feeding claw 9 is detachably opposed to the intermittently cut-out feeding groove 19 on both sides of the strip material 13 inserted along the guide surface 12 of the screw feeding portion 11 described above. I have to.

As shown in FIGS. 1 and 2, a spring 20 of a coil spring is attached in a slightly obliquely upward direction in the middle portion of the strip feeding pawl 9 so that the strip feeding pawl 9 is always pulled laterally. The swinging band feeding claw 9 can be pulled to return to the original position.

On the other hand, the screw feeding section 11 is provided with
As described above, the strip 13 to which the screw 7 having a predetermined length is attached can be fed from the side along the guide surface 12, and the strip 7 is intermittently fed by the strip feeding pawl 9 described above. The part 21 is located at the tip of the bit 8 described above, and the screw 7
Is designed so that it can be fastened to a predetermined part.

As shown in FIG. 1 to FIG. 3, the band pressing member 22 is attached along the guide surface 12 of the screw feeding section 11 so that the band member 13 does not meander, and the inner end of the band pressing member 22 is also prevented. A predetermined position of the strip material 13 fed into the projecting portion 23 is locked so that the strip material 13 can be accurately positioned.

As shown in FIGS. 1 and 3, the screw feeding device main body 4 thus constructed is provided with the lock portion 24 of the band feeding claw 9, and the screw 7 cannot be tightened by the screw driver-1. In this case, by operating the lock portion 24, the tip of the lock portion 24 is locked to the guide roller 14 of the strip material feeding pawl 9 as shown by the one-dot chain line in FIG. The belt 13 is prevented from descending so that the belt 13 cannot be fed so that mistakes can be prevented from overlapping.

As the lock mechanism, as shown in FIG. 4, the tip of the lock portion 24 is cut away by half or a lever is provided.
It is possible to appropriately stop the descent of the strip material feeding claw 9 as described above by providing, for example.

Reference numeral 25 is a depth gauge, which is the main body 4 of the screw feeder.
It is attached to the side part of the so that the feeding screw 7 can be tightened to a predetermined depth.

Then, as shown in FIG. 1, the screw driver-1 is connected to the screw feeding device 2, and the screw feeding portion 11 is connected.
If the band member 13 is inserted into and the screw driver-1 is driven and pushed in so as to face a predetermined object 26 to be attached, as shown in FIGS. 5 and 6, the outer body 3 is lowered and the bent portion of the guide hole 17 is bent. The guide roller 14 of the strip feeding pawl 9 is pushed by the guide roller 14 sliding along the long hole 15 of the screw feeding device main body 4 from the upper end to the lower end thereof to lower the strip feeding pawl 9. Then, the claw portion 18 at the tip of the band material feeding claw 9 is inserted into the feeding groove 19 of the band material 13.

When the screw driver-1 is further pushed, a long L-shaped guide hole 17 opened in the exterior body 3 is formed.
As shown in FIG. 7, the guide roller 16 in the middle of the strip feeding claw 9 is moved inward, and the strip feeding claw 9 swings inward with the upper guide roller 14 as a fulcrum. The band material 13 is fed along the guide surface 12 toward the tip of the bit.

When the screw driver-1 presses a predetermined amount in this way, the strip 13 is positioned to a predetermined position of the strip retainer 22 as shown in FIG. 7, and the head 21 of the screw 7 attached to the strip 13 is positioned. Is located at the tip of the bit 8 and the screw 7 can be driven to rotate by the bit 8, so that the mounted body 26 can be screwed to the mounting body 27.

At this time, as shown in FIG. 8, the guide roller 16 at the center of the strip feeding claw 9 is located at the vertical portion of the L-shaped guide hole 17 formed in the outer casing 3 and is made of spring material. The tensile force of 20 moves along the guide hole 17 to the upper end side of the guide hole 17.

When the screw 7 is tightened with the screw driver-1 and the screw driver-1 is pulled up, the exterior body 3
, The guide rollers 14 and 16 in the upper and central parts of the strip feeding pawl 9 have the elongated hole 15 and the guide hole 17 described above.
And is pulled laterally by the spring 20 to return to the original state as shown in the figure. In this way, by operating the screw driver-1, the screw 7 of the strip 13 is continuously fed to the tip of the bit 8 and the screw 7 is continuously tightened.

Therefore, the plate-shaped feeding member 9 and the spring member 2 are provided.
The belt member 13 to which the screw 7 is attached can be fed by a predetermined pitch by a cam mechanism of simple members such as 0, the long hole 16 and the guide hole 17.

If the screw 7 is not properly tightened by the screw driver-1, the screw 7 remains at the tip of the bit 8, but the lock portion 24 provided on the side of the exterior body 3 is shown in FIG. When swiveled as shown in FIG. 4, the leading end of the belt feed claw 9 locks the guide roller 14 so that the band feed claw 9 does not descend, and the band 13 cannot be fed, causing a trouble. It can be prevented from occurring.

In the above embodiment, the tightening of the screw-shaped screw has been described, but the present invention can be applied to a bolt in the same manner, and can also be used for driving a nail or a rivet.

Further, the spring material in the embodiment may be a leaf spring or a wire spring, or the band feed claw portion may be integrally molded with an engineer plastic material, etc., and appropriate design changes may be made based on the above-mentioned gist of the present invention. Is what you can do.

[0028]

As described above, according to the present invention, the strip material feeding claw is oscillated through the cam mechanism to feed the strip material having the screws attached in a row at a predetermined pitch to the tip side of the bit. Therefore, it is possible to provide a screw supply device at a low cost because it can be configured as easily as possible without using a complicated member or a large number of members.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention with a part omitted.

FIG. 2 is an enlarged cross-sectional view of the strip feeding claw portion of the above,

FIG. 3 is a side view of the lock portion of the above-mentioned strip feeding pawl,

FIG. 4 is a diagram for explaining the lock,

FIG. 5 is a side sectional view for explaining the screw feeding described above,

FIG. 6 is a side sectional view for explaining the screw feeding described above,

FIG. 7 is a side sectional view for explaining screw feeding in the above,

FIG. 8 is a side sectional view for explaining screw feeding in the same.

[Explanation of symbols]

1 ... Screw driver-2 ... Screw supply device
3 ... Exterior body 4 ... Screw supply device body 7 ... Screw
8 ... Bit 9 ... Band material feeding pawl 10 ... Cam mechanism 1
1 ... Screw feeding part 12 ... Guide surface 13 ... Band material 1
5 ... long hole 17 ... guide hole 19 ... feed groove 2
0 ... Spring material 21 ... Head 24 ... Lock part

Claims (3)

[Claims] 1. A screw arranged in a row on a strip is intermittently fed to the tip side of a bit of a screw driver,
Screw driver designed for continuous screw tightening
In the automatic screw feeder for the tape, in order to feed the strip with the screws arranged in a row on the tip side of the bit at a predetermined pitch, a strip feeding claw of a predetermined length is swung on the screw feeder main body at a predetermined angle. It is movably arranged via a cam mechanism, and the tip of the strip feeding pawl is removably opposed to the strip, and a screw driver for tightening a screw at a predetermined portion.
When pushing in, the band feed claw is swung to the bit side by a predetermined angle, and the tip of the band feed claw is locked to the band so that the band is intermittently fed to the bit tip side by a predetermined amount. When the screw driver is pulled up from a screw fastened to a predetermined part, the tip of the band feed claw is separated from the band and disposed in the screw feeder main body so as to be able to return to the original position. Automatic screw feeder for screw driver. 2. A strip feeding claw is moved up and down by a predetermined amount by a cam mechanism so as to be swingable, and a spring is attached to the strip feeding claw to return the strip feeding claw to its original position. The screw according to claim 1, which is attached to the main body of the screw feeder.
Automatic screw feeder for driver. 3. The screw driver according to claim 1 or 2, wherein a lock portion is detachably attached to the band feed claw so that the band feed claw can be locked when screw tightening is poor. Automatic screw feeder.