JP2018089716A - Screw supply device and screw supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate biting-in of a washer by correcting an attitude of a screw with the washer.SOLUTION: A screw supply device 10 is the screw supply device for installing a screw 30 with a washer supplied from a screw supply machine 12 and carried on a carrier rail 26 in a cartridge 34, and comprises a suction nozzle 16 formed in a pipe shape and having an outer diameter larger than a diameter of the washer of the screw with the washer and an inner diameter larger than a diameter of a head part of the screw with the washer, a pressing member 17 provided at an equal distance as a distance up to the head part of the screw with the washer from a position of a desired washer from the tip of the suction nozzle on the inside of the suction nozzle, a driving part 20 for moving the suction nozzle to the position of the head part of the screw with the washer placed on the carrier rail and approaching the head part of the screw with the washer by lowering a tip part of the suction nozzle and a suction part 18 for sucking the screw with the washer after pressing the head part of the screw with the washer by approaching the tip part of the suction nozzle to the head part of the screw with the washer.SELECTED DRAWING: Figure 2

Description

  The present application relates to a screw supply device and a screw supply method.

  A cartridge may be used as a part for supplying screws to the screw tightener. As such a cartridge, for example, there is a cartridge formed in a disk shape. This disk-shaped cartridge has a plurality of screw filling holes arranged in an annular shape along the circumferential direction of the cartridge. The plurality of screw filling holes are respectively filled with screws, and the screws filled in the plurality of filling holes are supplied to the screw tightener for each cartridge.

JP 2001-121440 A

  In general, a commercially available screw with a washer is mixed with a biting screw in which a washer bites into a screw portion, and the cartridge may be filled with the biting screw. When the cartridge filled with the biting screw is supplied to the screw tightening machine, the screw tightening machine cannot vacuum-suck the biting screw with the suction nozzle, and the screw may drop. This is because, even if the suction nozzle of the screw tightener tries to vacuum-suck the biting screw, the biting screw generates a gap between the suction nozzle and the washer.

  On the other hand, when supplying a screw with a washer to a cartridge with a commercially available screw feeder, it is possible to remove the biting screw by transporting only the screw that passes through the passing window having the shape of a normal washer screw. It is. However, it takes time and effort to periodically remove the biting screws that have been removed by interference with the passing window from the screw feeder. Further, if the biting screw stopped at the passage window is not removed, a normal screw cannot be supplied by the accumulated biting screw.

  In one aspect, an object is to provide a screw supply device and a screw supply method that eliminate the biting of a washer from a screw with a washer supplied to a cartridge.

  According to one embodiment, a screw supply device for filling a cartridge with a screw with a washer conveyed on a conveyance rail, the outer diameter larger than the diameter of the washer of the screw with a washer, The suction nozzle having an inner diameter larger than the diameter of the screw head, and a distance equal to the distance from a desired washer position to the screw head from the tip of the suction nozzle is provided inside the suction nozzle. A pressing member, a drive unit that moves the suction nozzle to the position of the head of the screw with the washer mounted on the transport rail, and lowers the tip of the suction nozzle to approach the screw head, and the suction nozzle And a suction part for sucking the screw with the washer after pressing the head of the screw with the washer by pressing the head of the screw with the washer.

  According to another aspect, a screw supply comprising a transport rail for transporting a screw with a washer from a screw feeder, a pipe-like suction nozzle for sucking the screw with a washer, and a pressing member provided inside the suction nozzle. A screw supply method for supplying a screw with a washer to a cartridge by an apparatus, wherein the screw with a washer is transported to a position below a suction nozzle by a transport rail, and a head of a screw with a washer placed on the transport rail is The suction nozzle is moved to the position, the tip of the suction nozzle is lowered to approach the head of the screw with the washer, and the tip of the suction nozzle is brought close to the head of the screw with the washer. Press the head of the washer to correct the posture of the screw with washer, press the head of the screw with washer, suck the screw with washer, and raise the suction nozzle to place the screw with washer on the cartridge. Filling Including a Rukoto, a screw feed method is provided.

  According to the screw supply device and the screw supply method of the disclosure, the biting of the washer is eliminated from the screw with the washer supplied to the cartridge.

(A) is a longitudinal sectional view of the disclosed screw supply device, (b) is a side view of a normal screw with washer, and (c) is a side view of the screw with washer that has been bitten. It is a perspective view of an adsorption nozzle, a cartridge, and a screw supply machine with which a screw supply device of an indication is provided. (A) is a figure which shows the state before an adsorption nozzle adsorb | sucks the biting screw on a conveyance rail, (b) is an adsorption nozzle descend | falls, a screw is corrected, and a screw with a washer is adsorbed by an adsorption nozzle. (C) is a diagram showing a state where the suction nozzle is raised and the screw with the washer is filled in the cartridge. (A) is a figure which shows the state just before correcting the biting screw which an adsorption nozzle is on a conveyance rail, and is a figure which shows the relationship between an adsorption nozzle and an biting screw, (b) is a pressing member of an adsorption nozzle It is a figure which shows the state by which the screw was corrected by this, and is a figure which shows the relationship between the screw with a washer and the suction nozzle. It is a longitudinal cross-sectional view which shows a mode that a screw is supplied to a screwing machine from a cartridge. (A) shows another example of the pressing member of the suction nozzle, and shows the state before the suction nozzle sucks the biting screw on the transport rail, and (b) shows that the suction nozzle is lowered. It is a figure which shows the state in which the biting screw was corrected by the pressing member of the suction nozzle.

  Hereinafter, embodiments of the present application will be described in detail based on specific examples with reference to the accompanying drawings. In the following embodiments, the same or similar elements are denoted by common reference numerals, and the scale of these drawings is appropriately changed for easy understanding.

  As shown in FIG. 1A and FIG. 2, the disclosed screw supply device 10 includes a screw supply device 12, a suction nozzle 16, a pressing member 17, a first drive unit 14, a vacuum ejector 18, A second drive unit 20, a control unit 22, and a table 60 driven by the first drive unit 14 are provided. The screw supply device 10 fills the cartridge 34 placed on the table 60 with the screw 30 with washer supplied from the screw supplier 12.

  The screw feeder 12 includes a screw storage unit 24, a screw alignment unit 26, and a vibration feeder 28. The screw storage unit 24 stores a plurality of screws 30 with washers. The vibration feeder 28 operates to generate vibration. In the screw feeder 12, when the vibration feeder 28 is operated, the plurality of screws 30 with washers are conveyed from the screw storage unit 24 to the screw alignment unit 26, and the plurality of screws 30 with washers are screwed into the screw alignment unit 26 (on the conveyance rail). In one example).

  As shown in FIGS. 1B and 1C, the screw 30 with a washer supplied by the screw supply device 10 of the present embodiment includes a screw body 31, a spring washer 32a, and a plain washer 32b. Usually, the screw 30 with a washer is in a position where the spring washer 32 a is in contact with the head of the screw main body 31 as shown in FIG. However, as shown in FIG. 1C, the spring washer 32 a or the flat washer 32 b rides on the screw portion of the screw main body 31 and bites into a part of the commercially available screw 30 with washer. That is, there are things that stop moving when they are bitten. In this specification, the screw 30 with a washer in a state where the spring washer 32a or the plain washer 32b is bitten may be referred to as a biting screw 30b.

  As shown in FIG. 2, the screw alignment portion 26 is formed with a groove 33 that opens upward in the vertical direction and extends in the horizontal direction. In the screw aligning portion 26, the shaft portion of each washer-attached screw 30 is inserted into the groove 33, whereby each washer-attached screw 30 is aligned with the head portion facing up. The head washer-attached screw 30 in the screw aligning portion 26 is positioned at one end of the screw aligning portion 26 by the shaft portion of the washer-attached screw 30 coming into contact with one end of the groove 33. A screw 30 with a washer at the head of the screw aligning portion 26 is supplied to the cartridge 34 by the suction nozzle 16 described later.

  The cartridge 34 is formed in a disk shape, and is arranged with the vertical direction as the axial direction. As shown in FIG. 1A, the cartridge 34 is fixed to a table 60 of the first drive unit 14 described later, and rotates around the vertical axis together with the table 60. The cartridge 34 is detachably fixed to the table 60, is detached from the table 60, and is applied to a screw tightener 80 described later (see FIG. 5).

  The cartridge 34 has a plurality of screw filling holes 36 arranged in the circumferential direction of the cartridge 34. The plurality of screw filling holes 36 are each formed in a circular cross section and penetrate along the axial direction of the cartridge 34.

  In a state where the cartridge 34 is fixed to the table 60, the cartridge 34 is disposed above the screw alignment portion 26. Further, each part is set such that the distance from the central axis of the cartridge 34 to the central axis of the head washer screw 30 in the screw aligning section 26 is equal to the distance from the central axis of the cartridge 34 to the central axis of the screw filling hole 36. The length of is set.

  As shown in FIG. 1A, the cartridge 34 includes a main body portion 38 and a gripping sheet 40 for gripping the screw 30 with a washer. The grip sheet 40 is made of plastic, for example, and is formed in a substantially annular shape. Although not shown, the grip sheet 40 is fixed to the main body 38 by a fixing ring and a plurality of bolts. In the gripping sheet 40, screw gripping portions 50 are formed corresponding to the plurality of screw filling holes 36, respectively. Each screw gripping portion 50 has a gripping piece 52 and a gripping piece 54.

  As shown in FIG. 1A, the shaft portion of the screw 30 with a washer filled in the screw filling hole 36 is sandwiched between a gripping piece 52 located inside the cartridge 34 and a gripping piece 54 located outside. . That is, the screw 30 with washer is filled in the screw filling hole 36 while being held by the screw holding portion 50.

  The first drive unit 14 illustrated in FIG. 1A includes a table 60 and a motor 62. The table 60 is formed in a disk shape and is arranged with the vertical direction as the axial direction. The table 60 has a mechanism for detachably holding the cartridge 34. A through hole 64 is formed in the table 60 coaxially with each screw filling hole 36 of the cartridge 34.

  The table 60 rotates around the vertical axis along with the operation of the motor 62. When the cartridge 34 is rotated by a predetermined angle by the first drive unit 14, the plurality of screw filling holes 36 are sequentially arranged at positions coaxial with the suction nozzle 16, that is, screw filling positions.

  As shown in FIGS. 1A and 2, the suction nozzle 16 is formed in a pipe shape, and is arranged with the vertical direction as an axial direction. The suction nozzle 16 is disposed on the opposite side of the screw aligning portion 26 between the leading screw 30 and the cartridge 34, that is, above the cartridge 34. Further, the suction nozzle 16 is arranged coaxially with the head screw 30 in the screw alignment portion 26.

  4B, the suction nozzle 16 has an outer diameter D1 larger than the diameter D2 of the flat washer 32b of the screw 30 with the washer. The suction nozzle 16 has an inner diameter D3 that is larger than the diameter D4 of the head of the screw 30 with a washer. By setting the outer diameter D1 and inner diameter D2 of the suction nozzle 16 in this way, the tip of the suction nozzle 16 can be covered with a flat washer 32b as shown in FIG. The washer-attached screw 30 can be sucked by the ejector 18 (an example of a suction portion).

  Further, as shown in FIGS. 4A and 4B, a pressing member 17 for pressing the head of the screw 30 with a washer is provided inside the suction nozzle 16. The pressing member 17 is provided at a distance equal to the distance H1 from the tip of the suction nozzle 16 to the position of the desired flat washer 32b to the top of the head of the screw body 31. The pressing member 17 is formed in a disk shape so as to be provided inside the suction nozzle 16, and is fixed at a predetermined distance by a stopper 19 formed inside the suction nozzle 16. Further, as shown in FIGS. 4A and 4B, at least one through hole 21 is formed so that air can be sucked by the vacuum ejector 18.

  The suction nozzle 16 is lowered by the second drive unit 20 described later, that is, moved in the direction of arrow A in FIG. By providing the pressing member 17 inside the suction nozzle 16, the head of the biting screw 30 b on the screw alignment portion 26 can be pressed and the biting of the biting screw 30 b can be corrected.

  The second drive unit 20 that drives the suction nozzle 16 is provided with a slider mechanism 70 having a movable portion 66 and a guide portion 68, and the suction nozzle 16 is fixed to the movable portion 66 of the slider mechanism 70. ing. The suction nozzle 16 moves in the vertical direction together with the movable portion 66 of the slider mechanism 70.

  The vacuum ejector 18 is connected between the compressed air supply source 72 and the suction nozzle 16. When compressed air is supplied from the compressed air supply source 72 to the vacuum ejector 18, the vacuum ejector 18 is driven, and air is sucked from the tip of the suction nozzle 16, that is, the suction port.

  The second drive unit 20 includes a direction control valve 74 and an air cylinder 76. The direction control valve 74 is connected between the compressed air supply source 72 and the air cylinder 76. The movable part of the air cylinder 76 is connected to the suction nozzle 16.

  The second drive unit 20 reciprocates the suction nozzle 16. That is, when compressed air is supplied from the compressed air supply source 72 to the air cylinder 76 via the direction control valve 74, the suction nozzle 16 moves in the vertical direction. Further, along with the switching of the direction control valve 74, the operating direction of the air cylinder 76 is switched, and the moving direction of the suction nozzle 16 is changed.

  The control unit 22 includes an electronic circuit having, for example, an arithmetic device and a storage device, and the vibration feeder 28, the motor 62 of the first drive unit 14, the vacuum ejector 18, and the direction control valve 74 of the second drive unit 20. To control.

  Next, a method for supplying the screw 30 with the washer to the cartridge 34 using the screw supply device 10 will be described.

  First, the vibration feeder 28 of the screw feeder 12 is activated, and a plurality of screws 30 with washers are conveyed from the screw storage unit 24 to the screw alignment unit 26, and the plurality of screws 30 with washers are aligned with the screw alignment unit 26. Aligned. The head washer-attached screw 30 in the screw aligning portion 26 is positioned at one end of the screw aligning portion 26 by the shaft portion of the washer-attached screw 30 coming into contact with one end of the groove 32. As shown in FIG. 3A, the head washer-attached screw 30 is disposed coaxially with the screw filling hole 36 at the screw filling position among the plurality of screw filling holes 36. In FIG. 3A, the case where the head washer-attached screw 30 is the biting screw 30b is shown.

  Subsequently, as shown in FIG. 3B, the air cylinder 76 of the second drive unit 20 is operated, and the suction nozzle 16 moves in the forward direction, that is, descends in the direction of arrow A in FIG. . The suction nozzle 16 passes through the screw filling hole 36 when descending. When the suction nozzle 16 descends through the screw filling hole 36, as shown in FIG. 3B, the suction nozzle slidably contacts the plurality of gripping pieces 52 and 54 forming the screw gripping portion 50, The gripping pieces 52 and 54 are elastically deformed toward the tip end side of the suction nozzle 16. When the tip of the suction nozzle 16 reaches the head washer-attached screw 30 that can be placed on the screw alignment portion 26, the air cylinder 76 is stopped and the suction nozzle 16 is held at the lowered position.

  At this time, the pressing member 17 at the tip of the suction nozzle presses the head of the biting screw 30b, the biting is corrected, and the biting screw 30b becomes a normal screw 30 with a washer. Then, the vacuum ejector 18 operates, air is sucked from the tip of the suction nozzle 16, and the head washer-attached screw 30 in the screw alignment portion 26 is sucked by the suction nozzle 16.

  Subsequently, as shown in FIG. 3C, the operation direction of the air cylinder 76 is switched by the direction control valve 74, the air cylinder 76 operates in the reverse direction, and moves in the return direction of the suction nozzle 16, that is, It rises in the direction of arrow B in FIG.

  When the suction nozzle 16 moves up and passes through the screw gripping portion 50, the gripping pieces 52 and 54 forming the screw gripping portion 50 return to the original shape, and the shaft portion of the washer-attached screw 30 sucked by the suction nozzle 16 is moved. The screw is held by the screw holding portion 50 and remains in the screw filling hole 36. Thereafter, the vacuum ejector 18 is stopped and the suction of air from the tip of the suction nozzle 16 is stopped. The suction nozzle 16 further rises and rises to above the cartridge 34 as shown in FIG.

  When the suction nozzle 16 rises above the cartridge 34, the motor 62 of the first drive unit 14 is operated, and the cartridge 34 rotates in the direction of arrow C in FIG. 21 together with the table 60. And the screw 30 with a washer is sequentially supplied to the next screw filling hole 36 among the plurality of screw filling holes 36, and each of the plurality of screw filling holes 36 is filled with the screw 30 with a washer.

  The cartridge 34 is removed from the table 60 and attached to the screw tightener 80 shown in FIG. The screw 30 with a washer filled in the cartridge 34 is supplied to an electric driver 82 of the screw tightening machine. The electric driver 82 includes a motor 84, a driver 86, and a case 88. The driver 86 is housed in a cylindrical case 88 and is fixed to the output shaft of the motor 84.

  In the electric driver 82, the air inside the case 88 is sucked by the suction device 90, so that the screw 30 with washer is adsorbed to the tip of the driver 86. Further, the electric driver 82 is conveyed to a fastening destination of the screw 30 by a transporter 92 such as a robot hand, and the motor 84 is operated at the fastening destination of the screw 30, whereby the driver 86 is rotated and the screw 30 with washer is rotated. It is screwed into the screw hole at the fastening destination.

  The pressing member 17 attached to the suction nozzle 16 shown in FIGS. 1 (a) to 4 is a disk-shaped member formed with a through hole 21 for suction. As long as it can be pressed, another shape may be used. For example, as shown in FIGS. 6A and 6B, the pressing member 17b is a long-axis rod-like member extending from the end (rear end) of the suction nozzle 16 on the side opposite to the suction port. There may be. In this case, as shown in FIG. 6A, the pressing member 17b is positioned above the biting screw 30b. Subsequently, as shown in FIG. 6 (b), when the suction nozzle 16 descends, the tip of the pressing member 17b formed in a bar shape presses the biting screw 30b, and the biting of the biting screw 30b occurs. Is corrected. The pressing member 17 may be a pin-shaped member that protrudes from the tip of the suction nozzle 16 to the inner wall at a distance H1.

  The present application has been described in detail with particular reference to preferred embodiments thereof. For easy understanding of the present application, specific forms of the present application are appended below.

(Supplementary note 1) A screw supply device for filling a cartridge with a screw with a washer supplied from a screw supply machine and conveyed on a conveyance rail,
A suction nozzle formed in a pipe shape and having an outer diameter larger than the diameter of the washer screw and a head diameter of the washer screw;
A pressing member provided inside the suction nozzle at a distance equal to the distance from the tip of the suction nozzle to the head of the screw with the washer from a desired washer position;
A drive unit that moves the suction nozzle to the position of the head of the screw with washer placed on the transport rail, and lowers the tip of the suction nozzle to approach the head of the screw with washer; ,
A suction part for sucking the screw with the washer after pressing the head part of the screw with the washer by causing the tip of the suction nozzle to approach the head of the screw with the washer;
A screw supply device.
(Appendix 2)
The screw supply device according to appendix 1, wherein the pressing member is formed in a disk shape and has at least one through hole.
(Appendix 3)
The screw supply device according to appendix 1, wherein the pressing member is a rod-shaped member extending from the rear end of the suction nozzle into the suction nozzle.
(Appendix 4)
The screw supply device according to appendix 1, wherein the pressing member is at least one pin protruding from an inner wall of the suction nozzle at a position of the distance from a tip portion of the suction nozzle.
(Appendix 5)
The washer is provided by a screw supply device comprising: a transport rail that transports a screw with a washer from a screw feeder; a pipe-like suction nozzle that sucks the screw with a washer; and a pressing member provided inside the suction nozzle. A screw supply method for supplying an attached screw to a cartridge,
Transporting the screw with the washer to the lower part of the suction nozzle by the transport rail;
Moving the suction nozzle to the position of the head of the screw with washer placed on the transport rail and lowering the tip of the suction nozzle to approach the head of the screw with washer; ,
Correcting the posture of the screw with washer by bringing the tip of the suction nozzle closer to the head of the screw with washer and pressing the head of the screw with washer;
After pressing the head of the screw with the washer, sucking the screw with the washer;
Raising the suction nozzle and filling the cartridge with the screw with washer;
Including a screw supply method.

DESCRIPTION OF SYMBOLS 10 Screw supply apparatus 12 Screw supply machine 14 1st drive part 16 Adsorption nozzle 17, 17a Press member 18 Vacuum ejector (adsorption part)
20 Second drive unit (drive unit)
22 Control part 26 Screw alignment part (conveying rail)
30 Screw with Washer 31 Screw Body 32a Spring Washer 32b Plain Washer 34 Cartridge 36 Screw Filling Hole 50 Screw Grip 52, 54 Grip Piece

Claims (3)

A screw supply device for mounting a screw with a washer supplied from a screw feeder and conveyed on a conveyance rail to a cartridge,
A suction nozzle formed in a pipe shape and having an outer diameter larger than the diameter of the washer screw and a head diameter of the washer screw;
A pressing member provided inside the suction nozzle at a distance equal to the distance from the tip of the suction nozzle to the head of the screw with the washer from a desired washer position;
A drive unit that moves the suction nozzle to the position of the head of the screw with washer placed on the transport rail, and lowers the tip of the suction nozzle to approach the head of the screw with washer; ,
A suction part for sucking the screw with the washer after pressing the head part of the screw with the washer by causing the tip of the suction nozzle to approach the head of the screw with the washer;
A screw supply device.   The screw supply device according to claim 1, wherein the pressing member is formed in a disk shape and has at least one through hole. The washer is provided by a screw supply device comprising: a transport rail that transports a screw with a washer from a screw feeder; a pipe-like suction nozzle that sucks the screw with a washer; and a pressing member provided inside the suction nozzle. A screw supply method for supplying an attached screw to a cartridge,
Transporting the screw with the washer to the lower part of the suction nozzle by the transport rail;
Moving the suction nozzle to the position of the head of the screw with washer placed on the transport rail and lowering the tip of the suction nozzle to approach the head of the screw with washer; ,
Correcting the posture of the screw with washer by bringing the tip of the suction nozzle closer to the head of the screw with washer and pressing the head of the screw with washer;
After pressing the head of the screw with the washer, sucking the screw with the washer;
Raising the suction nozzle and filling the cartridge with the screw with washer;
Including a screw supply method.

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