JP3360263B2 - Screw fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw tightening device for taking out screws supplied from a screw aligning and supplying device or the like one by one and transferring the screws to a target position where the screws are to be tightened. Things.

[0002]

2. Description of the Related Art FIG. 16 is an explanatory view of a main part showing a taking-in operation of a conventional screw fastening device. FIG. 17 is an explanatory view of a main part showing a screw tightening operation of the conventional screw tightening device. FIG. 18 is an explanatory view of a main part showing an abnormal state of the take-in operation of the conventional screw fastening device. In FIG. 16, reference numeral 1 (1a, 1b, 1c, 1d in the drawings; hereinafter, if no specific screw is meant, is simply indicated by a numeral; the same applies to other components); Is a guide tube for moving the screw 1 up and down to a predetermined position, and 84 is a pallet for taking out the screw 1 and aligning it in a line.

Next, the operation of the prior art shown in FIG. 16 will be described. As shown in FIG. 16, a vacuum is generated by a vacuum generator (not shown) in the direction of arrow 85 on the screw 1 in which the driver bit 20 and the guide cylinder 83 are aligned with the pallet 84, and the screw 1a is It is sucked into 83. Next, the screw 1a is conveyed to a position 88 of a predetermined member shown in FIG. Next, as shown in FIG. 17, while lowering the driver bit 20 and the guide cylinder 83 in the direction of the arrow 86,
Is rotated to tighten the screw 1a.

[0004]

Since the conventional screw tightening device is constructed as described above, the gap between the screw 1 and the inner diameter of the guide cylinder 83 increases depending on the outer diameter of the head of the screw 1, so that the screw 1 can be reliably formed. The screw 1 is not sucked, and the screw 1 may be dropped during the conveyance of the screw 1. Also,
As shown in FIG. 18, when the screw 1 is sucked in the inclined state in the guide cylinder 83, the screw is tightened in a state where the position of the screw 1 is not definitely determined. The work could be damaged.

In view of the above, the present invention reliably transports a screw to a screw tightening position, and further accurately positions the screw.
Another object of the present invention is to provide a screw tightening device that can eliminate screw tightening failures.

[0006]

According to a first aspect of the present invention, there is provided a screw tightening device, comprising: a screw conveying mechanism capable of conveying a screw to be tightened to a work in a substantially horizontal direction and a substantially vertical direction; and urging the screw conveying mechanism upward. An elastic body, an up-and-down regulating means for regulating movement of the screw transport mechanism in the substantially vertical direction by the elastic body, a vertical movement mechanism movable in the same direction as the vertical direction of the screw transport mechanism, A moving body urged downward by an elastic body that is movable substantially vertically by a moving mechanism, holding means fixed to the moving body and holding the screw, screw rotating means guided by the holding means,
Positioning means for determining the lower end of the stroke of the line press of the screw with respect to the movement of the vertical movement mechanism in the substantially vertical direction, wherein the positioning of the screw on the work by the positioning means, The lower surface of the wire holder and the work can be retracted without interference.

According to a second aspect of the present invention, in the screw tightening device, the screw transport mechanism has a recess into which a wire presser of the screw fits.

According to a third aspect of the present invention, in the screw tightening device, the holding means is fixed to the moving body , and guides the pressing of the screw on the screw transport mechanism.

[0009] screwing device according to claim 4, and a screw conveyor mechanism for moving pawl, and a substantially horizontally and substantially vertically to said pawl for holding the screw, substantially of the screw conveyor mechanism
Up and down regulating means for regulating the movement in the up and down direction, a driver bit disposed above the screw tightening position of the screw, a driver bit holder having the driver bit attached thereto, and a rotation driving mechanism of the driver bit, a vertically moving mechanism for moving at least the driver bit and the driver bit holder substantially vertically, said driver bit
Of the screw against the vertical movement of the holder.
And a positioning means for determining the lower end of the stroke of the hook, wherein the driver bit and the driver bit holder are interlocked to position the screw held by the nail, and the nail, the screw and A gap between the claw and the work is obtained, and the claw does not interfere with the screw and the work.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1A is a main part configuration diagram showing a screw fastening device according to the first embodiment of the present invention, FIG. 1B is an end view along a cutting line BB, and FIG. End view, (d)
FIG. 3 is an end view along a cutting line DD, and FIG. 3E is a perspective view of a driver bit. FIG. 2A is a sectional view taken along line A- in FIG.
FIG. 3A is an arrow view of the retaining collar viewed from a direction E in FIG. 2. FIG. 3 is an explanatory view showing a screw holding state by the screw tightening device in the embodiment of FIG.
FIG. 3 is an explanatory diagram showing a screw positioning state by the screw fastening device in the embodiment of FIG. 1. 5 is an explanatory view of a main part showing a screw positioning state by the screw tightening device in FIG. 4, and FIG. 6 is an explanatory view of a main part showing a screw tightening start state by the screw tightening device in FIG.

In the drawing, 1 is a screw used for screw tightening, 2 is a wire holder formed by drilling a hole in the center of a substantially rectangular parallelepiped attached to the screw 1, 3 is a work into which the screw 1 is screwed, 4
Is a female screw formed in the work 3, and 4A is a tapered portion formed near the upper opening of the female screw 4. Reference numeral 5 denotes a claw for holding the screw 1 and the wire retainer 2; 6, a substantially L-shaped claw fixing plate having a vertical surface and a horizontal surface on which the claw 5 is attached;
Is attached to the other side of the nail 5 of the nail fixing plate 6,
The other is attached to the fixing plate 8, which allows the vertical movement of the claw fixing plate 6 freely, and regulates and guides the movement in the substantially horizontal direction. A guide that allows the claws 5 to move up and down, 10 is a mounting plate that mounts the guide 9 that is mounted on the fixed plate 8, 11
Is an upper plate attached to the claw fixing plate 6, 12 is an upper end stopper located above the upper plate 11 and restrains the upward movement of the claw 5 attached to the fixing plate 8, and 13 is a lower part of the claw fixing plate 6. , The lower end stopper of the claw 5 attached to the fixing plate 8, 14 (14a, 14b) is a tension spring post A attached to the claw fixing plate 6, and 15 (15a, 15b) is attached to the fixing plate 8. The attached tension spring posts B, 16 (16
a, 16b) are tension springs, one of which is fixed to a tension spring post A14, and the other is a tension spring attached to a tension spring post 15B, and 17 is a slide plate to which a fixing plate 8 is fixed, which slides in the left-right direction in FIG. The claw 5 is freely movable from the screw tightening position to the avoidance position.

Reference numeral 18 denotes a linear motion guide, which is mounted on the support base 19 and guides the slide plate 17 in the moving direction.
a, 20b) is a driver bit which is arranged above the position of the female screw 4 of the work 3 and has a shape in which a Phillips screw is turned at the lower end.
1 (21a, 21b); 23, a driver bit holder fixing plate to which the driver bit holder 22 is fixed; and 24, a driver bit holder 22 attached to the driver bit holder fixing plate 23.
25 is a stopper plate which is disposed below the stopper 24 of the driver bit holder 22 and which is in contact with the stopper 24 of the driver bit holder 22. The stopper 24 of the driver bit holder 22 contacts the stopper plate 25. Thereby, the lowering of the driver bit holder 22 is restricted. 26 (26a, 26b) is a shaft attached to the driver bit holder fixing plate 23, 27 (27a, 26b).
27b) is a guide for guiding the shaft 26 in a substantially vertical direction, 28 (28a, 28b) is a compression spring disposed between the driver bit holder fixing plate 23 and the guide 27, 29
(29a, 29b) is a locking collar with a slit attached to each of the shafts 26, 30 is an L plate having a substantially L-shaped side surface to which the guide 27 is attached, 31 (31a, 3
1b) is a driver bit fixing bracket for fixing the driver bit 20; 32 (32a, 32b) is a connecting rod having one connected to an electric screwdriver (not shown) and the other connected to the driver bit fixing bracket 31 by a pin 33. , 35
Is a compression spring disposed between the driver bit fixing bracket 31 and the L plate 30 via a sliding collar 34;
A sliding bush 37 in the rotation direction and substantially vertical direction of the connecting rod 32 attached to the connecting rod 32;
8 is a pin fixing the retaining collar 37 and the connecting rod 32,
39 is a sliding plate of the retaining collar 37 in the rotating direction, 40 is a roller floor, 41 is a rotating shaft to which the roller floor 40 is attached, 42 is a roller floor fixing bracket to which the rotating shaft 41 is attached and further attached to the L plate 30. It is.

Next, the operation of the screw fastening device according to the present embodiment will be described. First, the claw 5 holding the screw 1 having the wire holder 2 (screw with wire holder) is moved to the upper part of the female screw 4 (4a, 4b) of the work 3 positioned by the work positioning mechanism (not shown). Next, the driver bit holder 22 and the roller floor 40 are lowered in the direction of arrow 43 in FIG. 1 by a driving source such as an air cylinder or a hydraulic cylinder, so that the roller floor 40 comes into contact with the upper plate 11 as shown in FIG. The tip of the driver bit holder 22 contacts the wire holder 2. Further, when the driver bit holder 22 and the roller floor 40 are lowered in the direction of the arrow 43 in FIG. 1, the driver bit is first placed immediately before (contact) the tip 44 of the screw 1 into the female screw 4 as shown in FIG. By setting the relationship between the stopper 24 and the stopper plate 25 so that the stopper 24 of the holder 22 comes into contact with the stopper plate 25, the tip of the driver bit holder 22 and the wire holder 2 are set.
When the roller floor 40 is lowered, the upper plate 11 is pressed down, and the claw fixing plate 6 is stopped by hitting the lower end stopper 13 provided on the fixing plate 8 as shown in FIG. Thus, a gap S2 is formed between the wire presser 2 and the claw 5, and a gap S3 is formed between the claw 5 and the work 3.

Here, when the claw 5 moves in the direction of the arrow 45 in FIG. 5, the upper plate 11 moves while contacting the roller floor 40, so that the claw 5 has the gap S1, the gap S2, and the gap S.
3 can be moved horizontally, and only the claw 5 can move rightward in FIG. 5 without contacting the wire holder 2 and the work 3. It should be noted that the tab 5 is moved in the direction of arrow 45 in FIG.
Is moved, the claw 5 is temporarily moved downward, and the state where the wire presser 2 is fitted into the recess of the claw 5 is released.
The upper plate 11 can be moved while contacting the roller floor 40, and only the claw 5 can move rightward in FIG. 5 without contacting the wire holder 2 and the work 3.

Next, as shown in FIG. 6, when the driver bit 20 is further lowered, the tip of the driver bit 20 enters the cross hole of the screw 1, and the driver bit 20 is rotated while rotating in the direction of arrow 46. It descends in the direction of the arrow 47 and tightens the screw 1 into the female screw 4. Thereby, the screw 1
Is completed.

As described above, according to the present embodiment, after the screw 1 having the wire presser 2 is conveyed to the upper part of the female screw 4, as shown in FIG. Since the upper plate 11 moves while being in contact with the roller floor 40, the claw 5 can move in parallel while maintaining the gaps S1, S2, and S3. For this reason, the claw 5 does not contact the wire presser 2 and the work 3, and the screw 1 with the wire presser 2 and the work 3 do not break.

Further, as shown in FIG. 5, when the tip 44 of the foot of the screw 1 enters the range of the tapered portion 4A of the female screw 4, the tip 44 of the foot of the screw 1 guided by the tapered portion 4A.
Enters the inner diameter of the female screw 4 so that the screw 1 can be positioned with respect to the female screw 4. Therefore, highly accurate positioning of the screw 1 is not required, and the screw 1 can be securely tightened. Further, as shown in FIG. 6, since the screw can be tightened without pressing the wire presser 2, the variation in the tightening torque is eliminated, and the variation in the screw torque at the time of the screw tightening can be suppressed. . As described above, the screw tightening device according to the present embodiment includes the screw transport mechanism including the linear motion guide 7, the slide plate 17, and the claw 5, which can transport the screw 1 to be fastened to the work 3 substantially horizontally and substantially vertically. An elastic body composed of a tension spring 16 for urging the screw conveying mechanism upward, an upper plate 11 and an upper end stopper 12 for restricting movement of the screw conveying mechanism in a substantially vertical direction by the elastic body, and a nail fixing plate 6 And lower end stopper 13
And a linear motion guide (not shown) for moving at least the driver bit 20 and the driver bit holder 22 substantially vertically in the same direction as the vertical direction of the screw transport mechanism. A vertical movement mechanism,
A moving body composed of a connecting rod 32 urged downward by an elastic body composed of a compression spring 35 that is movable substantially vertically by the vertical moving mechanism, and the moving body composed of the connecting rod 32 falls off from the vertical moving mechanism. Preventing means comprising a falling-off driver bit fixing bracket 31 for preventing
A holding means comprising a driver bit holder 22 fixed to a moving body comprising a rod 32 and holding the screw 1 ; a screw rotating means comprising a not-shown rotary drive mechanism and a driver bit 20 guided by the holding means; Positioning means comprising a stopper 24 and a stopper plate 25 for determining the lower end of the stroke of the wire presser 2 of the screw 1 with respect to the substantially vertical movement of the moving mechanism, and the work 3 of the screw 1 by the positioning means. In the above positioning state, the lower surface of the wire presser 2 of the screw 1 and the work 3
And a screw transport mechanism including the linear motion guide 7, the slide plate 17, and the claw 5, and in particular, can be retracted without interfering with the claw 5. it can.

With this configuration, the screw transport mechanism transports the screw 1 to be tightened to the work 3 in a substantially horizontal direction and a substantially vertical direction, and the screw transport mechanism is urged upward by an elastic body including a tension spring 16. The vertical movement of the screw transport mechanism is restricted by vertical control means including an upper plate 11 and an upper end stopper 12, a claw fixing plate 6 and a lower end stopper 13, and the holding means includes a wire presser for the screw 1.
2 and the lower end of the stroke of the wire presser 2 of the screw 1 is determined by the positioning means with respect to the substantially vertical movement of the vertical movement mechanism , and the screw rotating means guided by the holding means moves the screw 1 When the screw 1 is rotated and the screw 1 is positioned on the work 3 by the positioning means, the screw transport mechanism retracts the lower surface of the wire presser 2 and the work 3 without interfering with each other. Be tightened. Therefore, when the screw 1 is positioned on the work 3, a gap is formed between the lower surface of the wire presser 2 of the screw 1 and the work 3 and the screw transfer mechanism, so that the screw transfer before screw tightening is performed. When the mechanism is retracted, the screw 1 is prevented from being caught, and interruption of the screw tightening operation can be prevented.

Furthermore, the wire of the screw 1 of the present embodiment
Holding means comprising a driver bit holder 22 for holding the retainer 2, allows the vertical movement of the fixed to the mobile body are arranged on both sides of the line retainer 2 for guiding the wire retainer 2 screws 1 on the screw conveyor mechanism pawl 5 Which has a guide 9 which can be used as an embodiment corresponding to the claims. The holding means is fixed to the moving body and arranged on both sides of the wire presser 2 of the screw 1 on the screw transport mechanism, guides the allowable movement of the claw 5 up and down , accurately positions the screw 1 and its wire presser 2, The screw 1 is correctly held on the work 3 in a state where the screw transport mechanism is retracted, so that trouble in screw tightening work can be prevented.

In the present embodiment, a linear guide 7 for moving the claw 5 holding the screw 1 substantially horizontally and vertically.
And the slide plate 17 constitute a screw transport mechanism. The driver bit 20 has a rotary drive mechanism including an electric motor, an air motor, and the like (not shown). A linear motion guide (not shown) for vertically moving the driver bit 20 and the driver bit holder 22 constitutes a vertical movement mechanism. However, when implementing the present invention, the driver bit 20 and the driver bit holder 22 may be moved up and down in synchronization with the rotary drive mechanism .

In the above embodiment, the screw 1 with the wire retainer 2 has been mainly described. However, the present invention can be implemented without the wire presser 2. At this time, the gap S between the claw 5 and the screw 1
2 (the gap between the wire presser 2 and the claw 5 in FIG. 5) and the gap S3 between the claw 5 and the work 3, and the screw 1 is moved to the screw tightening position without the claw 5 interfering with the screw 1 and the work 3. It is possible to leave and leave. In this case, in particular,
Desirably, if the claw 5 is retracted while the screw 1 is slightly screwed at the screw tightening position, the screw 1 can be prevented from falling.

In the above-described embodiment, the screw transport mechanism including the claw 5 for holding the screw 1, the linear motion guide 7 for moving the claw 5 in a substantially horizontal direction and a substantially vertical direction, and the slide plate 17; A driver bit 20 disposed above the screw tightening position, a driver bit holder 22 to which the driver bit 20 is attached, and a driver bit 2
0, a rotary drive mechanism including an electric motor, an air motor, and the like (not shown), and a vertical movement mechanism including a linear motion guide (not shown) for moving at least the driver bit 20 and the driver bit holder 22 in a substantially vertical direction. In the screw tightening device, the driver bit 20 and the driver bit holder 22 are interlocked to position the screw 1 held by the claw 5, and the gap S2 between the claw 5 and the screw 1 and the gap between the claw 5 and the work 3 By obtaining S3, the claw 5 does not interfere with the screw 1 and the work 3, and the screw 1 is left at the screw tightening position so as to be retractable, which can be an embodiment corresponding to the claims. .

That is, the claw 5 holding the screw 1 is moved in a substantially horizontal direction and a substantially up and down direction, and the driver bit holder 22 having the driver bit 20 disposed above the screw tightening position and the driver bit 20 Among them, at least the driver bit 20 and the driver bit holder 22
And are moved substantially vertically. At this time, the driver bit 20 and the driver bit holder 22 are linked to
Position the screw 1 held in the
S2 between screw and screw 1 and gap S between claw 5 and work 3
3 is obtained, the claw 5 does not interfere with the screw 1 and the work 3, and the screw 1 is left at the screw tightening position so as to be retractable, and the screw 1 is positioned and the screw is tightened. Therefore, the screw 1 can be reliably transported to the screw tightening position, accurate positioning of the screw 1 and failure of screw tightening can be eliminated, and screw tightening can be performed reliably.

Embodiment 2 FIG. FIG. 7 is an explanatory view showing a main part of a screw-conveying state by the screw-fastening device according to the second embodiment of the present invention viewed from the front, and FIG. 8 is a screw-conveying state by the screw-fastening device according to the second embodiment of the present invention. FIG. 9 is an explanatory view of a main part viewed from a plane showing FIG.
FIG. 8 is an explanatory view of a main part as viewed from the front, showing an example of a screw conveyance state by the screw tightening device according to the second embodiment of the present invention. In the figure, a screw 1, a wire presser 2, a claw 5, and a guide 9 show the same components as those specified in the first embodiment, and a description thereof will be omitted. Reference numeral 48 denotes a bifurcated claw portion formed by notching the tip of the claw 5 in a substantially U-shape to form a claw end 48a and a claw end 48b. 49 (49a, 49b) denotes a bifurcated claw portion 4.
8, a projection 50 at the tip end is the projection 49 (49a, 4).
9b) is a step provided on the opposite side. This projection 4
9 and the step 50 on the opposite side are the recesses 5 of the present embodiment.
0A is formed. In the present embodiment, the recess 50A is a recess 50A into which the wire presser 2 of the screw 1 fits. However, in the case of implementing the present invention, a shape into which the screw 1 fits may be used.

Next, the operation of the screw fastening device according to the present embodiment will be described. Attach the foot part of the screw 1 to the tab end 48
a and the claw end portion 48b is inserted between the forked claw portions 48, the wire presser 2 is placed on the fork claw portion 48, and the screw 1 with the wire presser 2 is held. Further, two opposite sides of the square of the wire presser 2 are positioned by the projection 49 and the step portion 50, and the remaining two opposite sides are positioned by the guide 9, thereby positioning the screw 1 with the wire presser 2. .

As described above, in the present embodiment, as shown in FIG. 7 and FIG.
a and the claw end 48b is inserted between the forked claw portions 48, and the wire holder 2 is placed on the forked claw portion 48 and the screw 1 with the wire holder 2 is held by a simple mechanism.
The screw 1 with the wire retainer 2 can be positioned, held, and transported.

As shown in FIG. 9, when the screw 1 having the wire presser 2 is conveyed in the direction of the arrow 51 and stopped at the target position, the contact point 52 between the projection 49 and the wire presser 2 is set off by inertia. The movement of the screw 1 tilting and popping out in the direction of the arrow 53 as a rotation fulcrum is performed by the end 5 of the wire presser 2 of the screw 1.
The screw 1 having the wire retainer 2 does not come off the forked claw portion 48 because the screw 4 has an abutment with the step portion 50 and is prevented. In particular, the wire presser 2 is guided by the step 50 by the force in the direction of action of the weight of the screw 1, that is, the force in the direction of the arrow 55, and slides back to the normal state as shown in FIG. 7. Therefore, unlike the related art, the screw 1 can be reliably transported without dropping from the claw 5.

In the present embodiment, the claw 5 for holding the screw 1 is provided with a projection 49 and a projection 49 at the tip of the claw 5.
Has a step 50 on the opposite side of the
It is notched in the shape of a letter and has two branches, and this can be regarded as an embodiment according to the claims. Therefore,
The screw 1 having the wire presser 2 is conveyed by being guided by the step 50 where the step of the claw 5 is high, and the screw 1 having the wire presser 2 is guided by the step 50 and stops at the target position. Since the projection 49 passes under the wire presser 2 at the tip of the claw 5 having a low step when leaving, the screw 1 can be reliably transported without dropping the screw 1 from the claw 5 as in the related art. is there.

The screw transport mechanism of the present embodiment has a recess 50A consisting of a projection 49 into which the wire presser 2 of the screw 1 fits and a step 50 on the opposite side. Corresponding embodiments are possible.
Since the screw transport mechanism has a recess 50A into which the wire presser 2 of the screw 1 fits, and holds the wire presser 2 of the screw 1 there, it is necessary to position the screw 1 at a fixed point on the screw transport mechanism. And ensure screw transfer positioning.

Embodiment 3 FIG. 10 is a plan view of an embodiment showing a relationship with a transfer device that implements the screw tightening device of the present invention, and FIG.
It is -F sectional drawing. FIG. 12 is an explanatory view of the start of screw transfer of the apparatus of the embodiment shown in FIG. 10, and FIG.
FIG. 14 is an explanatory view of screw transfer of the device of the embodiment shown in FIG. 14, FIG. 14 is an explanatory view of a main part of screw transfer seen from the cutting line GG of the device of the embodiment shown in FIG. 13, and FIG. It is principal part explanatory drawing of the delivery of the screw seen from the position corresponding to cutting line GG of the apparatus of embodiment shown.

In the figure, a screw 1, a wire holder 2, a claw 5
Since (5a, 5b) and the guide 9 (9a, 9b, 9c) show the same components as those specified in the first embodiment, the description is omitted here. Reference numeral 56 denotes a screw alignment and supply unit that maintains the alignment of the plurality of screws 1 and supplies the screws in an aligned state, and 57 denotes a screw alignment and supply unit 56.
Screw fixing chute arranged at the supply port of screw 1
Is disposed at the outlet of the screw 1 of the screw fixing chute 57 and has a groove 78 (78a, 78b) having a sectional shape in the axial direction of the screw 1.
The screw fixing chute 57 receives the screw 1 from the screw alignment and supply means 56, and the rail 5
Hand over to 8.

Reference numeral 59 denotes a screw stopper which is disposed in a direction opposite to the supply direction of the screw 1 of the rail 58 and restrains the movement of the screw 1. Reference numeral 60 denotes a screw stopper which is attached to the screw stopper 59 and restrains the movement. 10, a cylinder A for driving the rail 58 left and right in FIG. 10; a cylinder A mounting plate 62 for mounting the cylinder A 61; a rail mounting plate 63 for mounting the rail 58; Is a linear guide for guiding the moving direction of the rail 58; 65 is a slide plate guided by a linear guide 64 for mounting the linear guide 64 and the cylinder A mounting plate 62; 67 is a cylinder B mounted on the slide plate 65;
68 is a cylinder B mounting plate on which the cylinder B67 is mounted;
Reference numeral 9 denotes a base on which the linear motion guide 66 and the cylinder B mounting plate 68 are mounted. Reference numeral 70 denotes a screw transfer claw that transfers the screw 1 from the groove 78 of the rail 58 to the claw 5. 71 is a cylinder with a guide to which a screw transfer claw 70 is attached, and 72 is a cylinder with a guide 71
The mounting plate 73 (73a, 73b) is the mounting plate 7
Reference numeral 74 denotes a guide for guiding the shaft 73 substantially in the vertical direction, and reference numeral 75 denotes a cylinder for moving the mounting plate 72 up and down. The detection sensor 60 is connected to the rail 58
Is used to detect the presence of the screw 1 abutting on the screw stopper 59 arranged in the direction opposite to the screw supply direction of the first screw, and to generate a signal to enter the next step. The rail 58 having the groove 78 having a cross section in the axial direction of the screw 1 may be any rail having a recess for accommodating the screw 1.

Next, the operation will be described with reference to FIGS. As shown in FIG. 10, a screw 1 having a wire presser 2 in the direction of arrow 76 from the screw alignment and supply means 56.
Are continuously pressed, whereby the screw fixing chute 5
7, the screw 1 with the wire retainer 2 hits the stopper 59, enters the groove 78a and the groove 78b of the rail 58, and is detected by the screw detection sensor 60. next,
When the rail 58 is moved in the direction of the arrow 77 shown in FIG. 10 by the cylinder A61, the screw 1 with the wire retainer 2 moves together with the rail 58 with the screw 1 in the groove 78. Then, as shown in FIG.
The rail 58 is moved in the direction of 9, and the screw 1a with the wire presser 2a and the screw 1b with the wire presser 2b are conveyed and stopped at the position shown in FIG.

The plate 72 is moved by the vertical cylinder 75.
The guide-equipped cylinder 71 and the screw transfer claw 70 arranged above move up, and as shown in FIG.
And the claw 5 are arranged so as to face each other with the rail 58 interposed therebetween. Next, the screw transfer claw 70 is attached to the guide cylinder 7.
1 drives in the direction of arrow 80 to push the screw 1 and move the screw 1 from the groove 78 of the rail 58 to the claw 5.

As described above, according to the present embodiment, the screws 1 which are continuously supplied can be separated one by one and supplied to the claws of the conveying means of the screws 1, so that the screws 1 can be automatically supplied. It can supply, transport and tighten screws. Further, as shown in FIG. 14, since the width W of the rail 58 is configured to be larger than the width X of the wire presser, the screw 1 with the wire presser 2 is stably held in the groove 78 of the rail 58, and In the supply direction of the screw 1, the wall 1 is provided so that the screw 1 does not fall off the rail 58, and the wire presser 2 is supported by the inclined surface 82 having the inclination angle θ. The screw 1 does not slide down to the side, and the screw 1 does not drop from the wall 81 side, and does not drop from the opposite side where the wall 81 is provided.

In this embodiment, the rail 5
The cylinder A61 that moves with the screw 1 placed on the rail 8 constitutes a rail moving mechanism. The drive mechanism is constituted by the upper and lower cylinders 75 and the guide cylinders 71 for transferring the screws to the claws 5 for holding the screws 1. Furthermore,
The linear motion guide 7 and the slide plate 17 for moving the claw 5 in a substantially horizontal direction and a substantially vertical direction constitute a screw transport mechanism.

According to the present embodiment, the screws 1 are maintained in a predetermined alignment state, and the screw feeding and feeding means 5 is sequentially fed.
6, a screw fixing chute 57 disposed at the supply port of the screw 1 of the screw alignment and supply means 56, and a groove having an axial sectional shape of the screw 1 disposed at the exit of the screw 1 of the screw fixing chute 57. Having a rail 58 and a screw stopper 59 disposed in a direction opposite to a screw supply direction of the rail 58.
And a sensor 1 for detecting the screw 1 attached to the screw stopper 59, a rail moving mechanism including a cylinder A61 that moves with the screw 1 mounted on the rail 58, and a screw 1 from the rail 58 moved by the rail moving mechanism. And a driving mechanism including an upper and lower cylinder 75 and a guided cylinder 71 for driving the screw transfer claw 70 to transfer the screw to the claw 5 holding the screw 1, and the claw 5 in a substantially horizontal and substantially horizontal direction. A screw transport mechanism including a linear motion guide 7 and a slide plate 17 for moving in the vertical direction, a driver bit 20 disposed above the screw tightening position of the screw 1, and a driver bit holder 2 to which the driver bit 20 is attached
2, and an electric motor (not shown) of the driver bit 20;
A rotation drive mechanism consisting of an air motor or the like, and includes a vertical movement mechanism comprising a linear guide (not shown) for moving at least the driver bit 20 and the driver bit holder 22 in a substantially vertical direction.

That is, the screws 1 are maintained in a predetermined alignment state by the screw aligning and supplying means 56, and are sequentially sent out to the screw fixing chutes 57 arranged at the screw supply ports of the screw aligning and supplying means 56. The screw is then moved until it comes into contact with a screw stopper 59 disposed at the outlet of the screw fixing chute 57 and arranged in a direction opposite to the screw supply direction of the rail 58 having a groove having a cross section in the axial direction of the screw. The screw detection sensor 60 attached to the screw stopper 59 detects that the screw 1 has come into contact with the screw stopper 59, and the rail 5 is mounted with the screw 1 placed.
8, the screw 70 is driven from the rail 58, the screw 70 is driven, the screw is transferred to the nail 5 holding the screw 1, and the continuously supplied screw is separated. Further, the screw 1 can be reliably transported to the screw tightening position, the positioning of the screw 1 can be made accurate, and the screw tightening failure can be eliminated.

The screw transport mechanism of the above-described embodiment transports the screw 1 to be tightened to the work 3 in a substantially horizontal direction and a substantially vertical direction. There is no need to set it almost vertically.
That is, from the viewpoint of workability, it is only necessary to set substantially horizontal and substantially vertical.

[0040]

As described above, according to the screw tightening device of the first aspect, the screw transport mechanism transports the screw to be tightened to the work in a substantially horizontal direction and a substantially vertical direction, and the screw transport mechanism is moved upward by an elastic body. is biased, the movement of the substantially vertical direction of the screw conveyor mechanism is restricted by the upper and lower limiting means, also, the transfer
The holding means fixed to the moving body holds the screw, determines the lower end of the stroke of the line press of the screw with respect to the substantially vertical movement of the moving body by the positioning means, and sets the screw guided by the holding means. The rotating means rotates the screw, and in a state where the screw is positioned on the work by the positioning means, the screw transport mechanism retracts the lower surface of the wire presser and the work without interfering with each other. The screw is tightened. Therefore, when the screw is positioned on the work, a gap is formed between the lower surface of the wire presser of the screw and the work and the screw transfer mechanism, so that the screw transfer mechanism is retracted before the screw is tightened. The screw can be prevented from being caught and the screwing operation can be prevented from being interrupted.

According to a second aspect of the present invention, in addition to the effect of the first aspect , the screw transport mechanism has a concave portion into which the screw presser is fitted, and holds the screw presser there. Therefore, the screw can be positioned at a fixed point on the screw transport mechanism, and the transport of the screw can be reliably positioned.

According to a third aspect of the present invention, in addition to the effect of the first or second aspect, the holding means is fixed to the moving body to guide the line press of the screw on the screw conveying mechanism, and the screw and its screw It is possible to accurately position the wire presser, hold the screw correctly on the work in a state where the screw transport mechanism is retracted, and prevent trouble in screw tightening work.

According to a fourth aspect of the present invention, there is provided a screwdriver in which a claw for holding a screw is moved in a substantially horizontal direction and a substantially vertical direction by a screw transport mechanism, and a driver bit disposed above the screw tightening position is attached. At least the driver bit and the driver bit holder of the holder and the rotary drive mechanism of the driver bit are moved substantially vertically by a vertical movement mechanism. At this time, the upper and lower regulating means and
The positioning means, in conjunction with the driver bit and the driver bit holder, performs positioning of the screw held by the claw, and obtains a gap between the claw and the screw and between the claw and the work. The screw is left at the screw tightening position to be retractable without interfering with the screw and the work, and the screw is positioned and the screw is tightened. Therefore, the gap between the claw and the screw and the gap between the claw and the work can be set arbitrarily, the claw does not interfere with the screw and the work, and the screw can be positioned and retracted by leaving the screw at the screw tightening position. Thus, the screw can be reliably transported to the screw tightening position, the screw can be accurately positioned, and a screw tightening failure can be eliminated.

[Brief description of the drawings]

FIG. 1A is a main part configuration diagram showing a screw fastening device according to a first embodiment of the present invention, FIG. 1B is an end view along a cutting line BB, and FIG. FIG. 3D is an end view along CC, FIG. 3D is an end view along cutting line DD, and FIG. 3E is a perspective view of a driver bit.

FIG. 2A is a view taken along the line AA of FIG. 1;
FIG. 2B is a view of the retaining collar viewed from the direction of arrow E in FIG.

FIG. 3 is an explanatory diagram showing a screw holding state by the screw tightening device in the embodiment of FIG. 1;

FIG. 4 is an explanatory diagram showing a screw positioning state by the screw tightening device in the embodiment of FIG. 1;

FIG. 5 is an explanatory view of a main part showing a screw positioning state by the screw tightening device in FIG. 4;

FIG. 6 is an explanatory view of a main part showing a screw tightening start state by the screw tightening device in FIG. 4;

FIG. 7 is an explanatory view of a main part as viewed from the front, showing a state in which a screw is conveyed by a screw tightening device according to a second embodiment of the present invention.

FIG. 8 is an explanatory view of a main part, viewed from a plane, showing a screw conveyance state by a screw tightening device according to a second embodiment of the present invention.

FIG. 9 is an explanatory view of a main part as viewed from the front, showing an example of a state in which a screw is conveyed by a screw fastening device according to a second embodiment of the present invention.

FIG. 10 is a plan view of an embodiment showing a relationship with a transport device that implements the screw fastening device of the present invention.

FIG. 11 is a sectional view taken along line FF of FIG. 10;

FIG. 12 is an explanatory diagram of the start of screw transfer of the screw tightening device according to the embodiment shown in FIG. 10;

FIG. 13 is an explanatory view of screw transfer of the screw fastening device according to the embodiment shown in FIG. 10;

FIG. 14 is a cutting line G of the screw fastening device of FIG. 13;
It is principal part explanatory drawing of the delivery of the screw seen from -G.

FIG. 15 is a cutting line G of the screw tightening device of FIG. 13;
It is principal part explanatory drawing of the delivery of the screw seen from the position equivalent to -G.

FIG. 16 is an explanatory view of a main part showing a take-in operation of a conventional screw fastening device.

FIG. 17 is an explanatory view of a main part showing a screw tightening operation of a conventional screw tightening device.

FIG. 18 is an explanatory view of a main part showing an abnormal state of the taking-in operation of the conventional screw fastening device.

[Explanation of symbols]

1 screw, 2 wire holder, 3 work, 5 claws, 7,
18 Linear motion guide, 20 driver bit, 22 driver bit holder, 48 bifurcated tab, 49 projection, 5
0 step, 56 screw alignment and supply means, 57 screw fixing chute, 58 rail, 59 screw stopper, 6
0 Detection sensor, 70 screw transfer claw, 75 vertical cylinder.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-279235 (JP, A) JP-A-63-139813 (JP, A) JP-A-6-55381 (JP, A) JP-A-6-55381 210528 (JP, A) JP-A-64-58429 (JP, A) JP-A-6-79550 (JP, A) JP-A-3-256921 (JP, A) Japanese Utility Model Publication No. 54-71885 (JP, U) Japanese Utility Model No. 6-79094 (JP, U) Japanese Utility Model No. 5-29638 (JP, U) Japanese Utility Model No. 4-118934 (JP, U) Japanese Utility Model No. 3-96137 (JP, U) Japanese Utility Model No. 54-28200 (JP, U) JP-A-2-130766 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23P 19/00-21/00

Claims (4)

(57) [Claims] 1. A screw transport mechanism capable of transporting a screw for tightening to a work in a substantially horizontal direction and a substantially vertical direction, an elastic body for urging the screw transport mechanism in an upward direction, and a screw transport mechanism using the elastic body. An up-and-down restricting means for restricting the movement in the substantially up-down direction, an up-down movement mechanism movable in the same direction as the up-down direction of the screw transport mechanism, and an elastic body movable substantially up-down direction by the up-down movement mechanism A moving body urged downward, holding means fixed to the moving body and holding the screw, screw rotating means guided by the holding means, and a substantially vertical movement of the vertical movement mechanism Positioning means for determining the lower end of the stroke of the screw presser. In the state where the screw is positioned on the work by the positioning means, the lower surface and the front of the screw presser are positioned. Screwing apparatus characterized by a workpiece and a screw conveyor mechanism is freely retracted without interference. 2. The screw tightening device according to claim 1, wherein the screw transport mechanism has a concave portion into which a wire presser of the screw fits. 3. The screw tightening device according to claim 1, wherein the holding means is fixed to the vertical movement mechanism and guides a line press of a screw on a screw conveyance mechanism. apparatus. 4. A claw for holding a screw, and said claw is substantially
A screw transport mechanism for moving in a horizontal direction and a substantially vertical direction,Up and down regulating the vertical movement of the screw transport mechanism
Regulatory measures and , A screwdriver set above the screw tightening position of the screw
And a driver bit to which the driver bit is attached.
A holder and a rotation drive mechanism for the driver bit; and at least the driver bit and the driver bit holder.
A vertical movement mechanism that moves the,  With respect to the substantially vertical movement of the driver bit holder,
Positioning to determine the lower end of the stroke of the screw wire presser
And a driver bit and a driver bit holder are linked to each other.
Then, when positioning the screw held by the claw,
In both cases, the claw and the screw and the claw and the work
With a gap, the claws interfere with the screw and the work
Without leaving the screw in the screw tightening position.
A screw tightening device, characterized in that: