JP3224261U - Automatic screwing machine - Google Patents

Abstract

An automatic screw tightening machine that can prevent a screw from dropping is provided in an automatic screw tightening machine that transports a screw on a transport unit in one direction. A conveying unit for conveying a screw, a vibrating unit for propelling a screw from a proximal end to a distal end on the conveying unit by applying vibration to the conveying unit, and a screw located at the distal end are locked. And an escape mechanism that moves the screw to a position where the screw is separated from the conveying unit and is fastened to the workpiece, and a holding unit 70 that is located above the screw located on the conveying unit and prevents the screw from jumping upward. , And a jig 80 that is attached to a position facing the tip of the pressing portion so as to be movable in the direction of gravity and presses a screw positioned on the conveying portion from above. [Selection] Figure 1

Description

  The present disclosure relates to an automatic screw tightener.

  In Patent Document 1, the conveyance rail is vibrated by a vibrating body, the screw on the conveyance rail is propelled, the screw that has come to the tip of the conveyance rail is locked out by an escape mechanism, and is fastened to the workpiece by a drive bit. An automatic screw tightener that moves to a position is disclosed.

JP 2003-200332 A

  In the screw tightening machine described above, there is a case where a holding rail is provided on the upper side of the conveyance rail in order to prevent the screw on the conveyance rail from protruding upward and dropping from the conveyance rail. In the case of the above configuration, if the distance between the holding rail and the conveyance rail is short, there is a possibility that the screw and the holding rail that are about to jump upward during conveyance are caught. Therefore, it is necessary to prevent the screw from being caught on the holding rail by increasing the distance between the rails.

  However, in the configuration in which the distance between the rails is increased, the screw located on the front end side in the transport direction is pushed by the propulsive force of the screw transported from the rear, and the washers 92 of adjacent screws are connected to each other as shown in FIG. If they overlap, there is a risk of an unstable posture floating above. In this case, when the screw is taken out by the escape mechanism, the screw of the unstable posture cannot be locked by the locking portion of the escape mechanism, and the screw may be dropped.

  The present disclosure has been made based on this situation, and an object thereof is to provide an automatic screw tightening machine capable of suppressing the occurrence of screw dropping in an automatic screw tightening machine having a large distance between rails. There is to do.

  A first aspect of the present disclosure for achieving the object includes a conveying unit, a vibrating unit that propels a screw from the proximal end to the distal end on the conveying unit by applying vibration to the conveying unit, and a distal end. An escape mechanism that locks the screw that is located, moves the screw to the position where it is fastened to the workpiece by separating the screw from the transfer unit, and is positioned above the screw that is located on the transfer unit. And a jig that is attached to a position facing the tip of the transport unit at the press part, and the jig is movable in the direction of gravity while pressing a screw located on the transport unit from above. It is an automatic screw tightening machine.

  Even if the above-mentioned automatic screw tightening machine is transferred to the tip of the transport section in an unstable posture with the screw floating upward, the screw can be held in a stable posture by pressing the screw from above with the weight of the jig. Can be returned. Therefore, according to the said structure, the screw | thread which reached the taking-out part can be returned to the stable attitude | position with a jig | tool irrespective of the position of the holding rail. Therefore, the screw can be stably locked by the escape mechanism from the transport unit, and the screw can be prevented from dropping.

It is a figure showing an automatic screw fastening machine of a 1st embodiment of this indication. It is II arrow directional view of FIG. It is a III arrow directional view of FIG. It is a figure which shows the jig | tool in 1st Embodiment of this indication. FIG. 5 is a view taken in the direction of arrow V in FIG. 4. It is a figure showing the state where a screw is stabilized. It is a figure which shows the comparative example of 1st Embodiment.

  Hereinafter, a plurality of embodiments of the present disclosure will be described based on the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of another embodiment described above can be applied to the other part of the configuration. Moreover, not only the combination of the configurations explicitly described in the description of each embodiment, but also the configuration of a plurality of embodiments can be partially combined even if they are not explicitly described, as long as there is no problem in the combination. And the combination which is not clearly described of the structure described in several embodiment and other embodiment shall also be disclosed by the following description.

(First embodiment)
FIG. 1 shows an example of an automatic screw tightening system 1 to which the automatic screw tightening machine of the present disclosure is applied. The automatic screw tightening system 1 includes a rotary drum 20, a conveyance unit 30, a vibration unit 40, an escape mechanism 50, a drive bit 60, a pressing unit 70, and a jig 80.

  In the present disclosure, a portion related to screw conveyance of the automatic screw tightening system 1 is referred to as an automatic screw tightening machine. The automatic screwing machine includes a conveyance unit 30, a vibration unit 40, an escape mechanism 50, a pressing unit 70, and a jig 80.

  In the above configuration, the jig 80 is attached to the tip 71 of the holding part, and the jig 80 is located above the screw located on the transport part 30 and is provided so as to move in the direction of gravity. ing.

  The conveying unit 30 extends from a position where the screw is supplied from the rotary drum 20 to a position where the screw is locked by the escape mechanism 50. Similarly to FIG. 2, the transport unit 30 in the above configuration is provided with a longitudinal groove 31 extending in the center in the screw transport direction. The lower neck portion 91 b of the screw is inserted into the vertical groove 31, and the washer 92 comes into contact with the upper surface 34 of the conveying unit outside the vertical groove 31. With the above posture, the screws on the transport unit are transported along the direction in which the longitudinal grooves of the transport unit 30 extend. In the present disclosure, the direction in which the screw is transported on the transport unit 30 is defined as the transport direction. The conveyance direction is a direction from the proximal end to the distal end of the conveyance unit 30. In FIG. 2, the position where the screw is conveyed is indicated by a dotted line. Reference numeral S denotes a screw that is positioned at the front end in the transport direction in the transport unit and is locked by the escape mechanism 50.

  The vibration unit 40 moves in the vertical direction and applies vibration to the conveyance unit 30, whereby the screw on the conveyance unit 30 vibrates and is conveyed while rotating. The direction in which the screw is conveyed is defined as the conveying direction.

  The escape mechanism 50 in the above configuration has a locking claw 51, a slide body 52, and a block body 53, as in FIG. The escape mechanism 50 locks the lower neck 91 b of the screw S located at the transport direction side tip of the transport unit 30 with a locking claw 51. Further, the escape mechanism 50 moves the locked screw S from the locking position a in FIG. 2 to the work fastening position b where the slide body 52 is fastened to the work. The automatic screw tightener fastens the screw that has reached the workpiece fastening position b to the workpiece with the drive bit 60 shown in FIG.

  FIG. 6 is a view showing a state in which the screw is stable. The screw 90 includes a head 91 a, a lower neck 91 b, a washer 92, and a spring washer 93. The head 91a is located at the upper apex of the screw, and a lower neck 91b is formed so as to protrude downward from the head 91a. The spring washer 93 and the washer 92 have a neck 91b inserted in a hole formed in the center. The spring washer 93 is in contact with the washer 92 and the head 91 and applies an elastic force to prevent the posture of the screw 90 from floating upward. In FIG. 6, the screw 90 has the spring washer 93, but a configuration without the spring washer 93 may be used.

  FIG. 7 is a comparative example of the first embodiment, and is an enlarged view of the vicinity of the front end portion 32 of the transport unit of the comparative example in which the jig 80 in FIG. 1 is abolished. In FIG. 7, since the jig 80 is abolished, the screw located at the front end portion 32 of the transport portion cannot be pressed from above. The screw located at the distal end portion 32 of the transport unit is pushed by the propulsive force received from the screw existing on the proximal end portion 35 side with respect to the distal end portion 32, so that the washer 92 of the adjacent screw may overlap. When the screw washers 92 overlap each other, the screw located at the distal end portion 32 is in an unstable posture that is lifted upward as shown in FIG.

  As shown in FIG. 1, the pressing unit 70 is disposed on the upper side of the transport unit 30. Further, the pressing portion 70 is disposed at a position overlapping the longitudinal groove 31 when viewed from the upper side in the gravity direction. In the configuration of the present disclosure, as shown in FIG. 7, the pressing unit 70 is installed above the height when the screw is opened on the transport unit 30.

  As shown in FIG. 1, the jig 80 of the present disclosure is attached to the front end of the holding unit 70 in the conveyance direction. That is, the jig 80 is disposed at a position facing the position S where the screw is locked by the escape mechanism in the transport unit 30. The position of the lower surface 83 of the jig is above the screw that is conveyed on the conveying unit 30.

  As shown in FIG. 3, the jig 80 includes a first leg portion 81 and a second leg portion 82 that extend downward, and a connection portion 84 that connects the upper portions of the first leg portion 81 and the second leg portion 82. have. In the present disclosure, a direction perpendicular to the transport direction and the vertical direction is defined as a width direction. As shown in FIG. 3, the lower end portions 81a and 82a of the first leg portion 81 and the second leg portion 82 are separated from each other in the width direction. Further, the first leg portion 81 and the second leg portion 82 sandwich both sides in the width direction with respect to the front end of the pressing portion 70 in the conveyance direction. The connection portion 84 is configured to connect the upper portions of the first leg portion 81 and the second leg portion 82 and abut against the upper surface 72 of the pressing portion.

  It is preferable that the upper surface 72 of the pressing portion is disposed so as to be parallel to the upper surface 34 of the conveying portion.

  The center of the connecting portion 84 of the jig 80 preferably coincides with the center of the screw S at the tip and the center of the transport portion 30 in the width direction.

  The jig 80 has a hole 86 as shown in FIG. The hole 86 has a long hole shape extending in the same direction as the transport direction. Further, a weight 85 is inserted into the hole 86 and can move in the longitudinal direction of the elongated hole shape, that is, the conveying direction, and can be fixed at an arbitrary position.

  As shown in FIG. 1, an inclined portion 87 is provided on the surface of the jig 80 that faces the conveyance unit 30 at the end opposite to the conveyance direction. The inclination part 87 inclines so that the distance with the conveyance part 30 may become large as it goes to the conveyance direction reverse side.

  FIG. 5 is a view taken in the direction of arrow V in FIG. As shown in FIG. 5, the tip of the jig 80 in the conveyance direction has an escape taper 88 that is inclined with respect to the conveyance direction. The escape taper 88 is inclined in the same direction as the direction in which the screw is moved from the transport unit 30 by the escape mechanism 50.

  The jig 80 is made of a resin material such as vinyl chloride. The specific gravity of the jig 80 may be lighter than the screw S or heavier than the screw S.

  The leading end of the jig 80 in the transport direction is the same as the leading end in the transport direction of the transport unit 30 in the transport direction, or is located on the transport direction side of the transport unit 30.

  The position of the lower surface 83 of the jig is arranged so as to coincide with the height of the screw head 91 a on the transport unit 30.

  The weight 85 is disposed above half of the jig 80.

  The weight 85 can be changed not only by a single type but also by the weight, diameter, etc., of the screws flowing through the transport unit 30.

  The length of the hole 86 in the transport direction is longer than half of the length of the jig 80 in the transport direction.

  According to the present embodiment described so far, the jig 80 is attached to the front end of the holding unit 70 in the conveyance direction, and the lower surface 83 of the jig is above the height of the screw on the conveyance unit 30. Is located. Further, the jig 80 is configured to be able to move in the direction of gravity, that is, in the vertical direction. Since the conveyance direction side front end of the pressing unit 70 is a position facing the conveyance direction side front end of the conveyance unit 30 in the vertical direction, according to the above configuration, the screw conveyed to the conveyance unit side front end of the conveyance unit 30 On the other hand, the jig 80 can apply a lower force by its own weight from the upper side. Therefore, even if the screw is transported to the distal end portion 32 of the transport unit in an unstable posture in which the screw jumps upward due to the overlap of the washer 92 or the like, the screw is stabilized by applying a force from above with the jig 80. Can return to posture.

  With the above configuration, it is possible to prevent the screw located at the distal end portion 32 from being in an unstable posture. Therefore, in the automatic screw tightening machine, it can be promoted that the escape mechanism 50 is reliably engaged with the screw.

  In the configuration of the present embodiment, the jig 80 has an elongated hole 86 extending in the transport direction, and a weight 85 that is inserted into the hole 86 and can be moved and fixed in the transport direction. According to the above configuration, by adjusting the position of the weight 85, the magnitude of the downward force at the conveyance direction side tip of the jig 80 can be changed. By having the weight 85, the magnitude of the downward force applied from the jig 80 to the screw located at the tip 32 is increased. Therefore, by adjusting the position of the weight 85 with the above configuration, it is possible to adjust the downward force applied to the screw located at the distal end portion 32 from the jig 80. Therefore, by adjusting the position of the weight 85 in accordance with the magnitude of the force with which the screw located at the distal end portion 32 protrudes upward, the screw can be prevented from being in an unstable posture.

  In the configuration described above, the magnitude of the downward force applied from the jig 80 is smaller than the magnitude of the force at which the screw located at the distal end portion 32 tries to advance in the transport direction due to the vibration provided from the vibration portion 40. It is preferable to adjust the position of the weight 85. Contrary to the above-described configuration, the weight of the downward force applied from the jig 80 to the screw positioned at the tip 32 is such that the screw 85 is positioned at a position where the screw is larger than the propulsive force in the transport direction at the tip 32. When the position is adjusted, there is a possibility that the screw located at the distal end portion 32 may not advance in the transport direction. On the other hand, in the configuration of the present disclosure, the force applied from the jig 80 to the screw positioned at the tip end portion 32 is smaller than the propulsive force in the transport direction from the screw positioned at the tip end portion 32. Can reach the position locked by the escape mechanism 50 without any problem.

  In the configuration of the present embodiment, as shown in FIG. 1, an inclined portion 87 is provided on the surface of the jig 80 corresponding to the conveyance portion at the end opposite to the conveyance direction. The inclination part 87 inclines so that the distance with the conveyance part 30 may become large as it goes to the conveyance direction reverse side. Contrary to the above configuration, in the case of the jig 80 not provided with the inclined portion 87, when the screw protruding upward is conveyed, it is caught by the corner on the opposite side of the conveyance direction of the jig 80, and on the conveyance unit 30. There is a risk that the screw will not move. On the other hand, in the case of the above configuration, even if the screw has been transported in an unstable posture that protrudes upward, it contacts the inclined portion 87. Since the screw that contacts the inclined portion 87 moves along the inclination direction of the inclined portion 87, the screw can move in the conveying direction without being caught by the jig 80. Therefore, in the above configuration, it is possible to prevent the screws from being clogged by the jig 80 and being unable to be conveyed.

  In the configuration of the present embodiment, as shown in FIG. 3, the jig 80 includes a first leg portion 81 and a second leg portion 82 that extend downward, and a first leg portion 81 and a second leg portion 82. The connection part 84 to connect is provided. The first leg portion 81 and the second leg portion 82 are configured such that the lower end portions 81a and 82a are separated from each other in the width direction. The connecting portion 84 is configured to connect the upper portions of the first leg portion 81 and the second leg portion 82. With the above configuration, the jig 80 inserts the pressing portion 70 from the region 80a formed in the width direction between the lower end portions 81a and 82a of the first leg portion 81 and the second leg portion 82, and the upper side of the pressing portion. The surface 72 and the connecting portion 84 can be brought into contact with each other. Therefore, the jig 80 can be assembled to the pressing portion from the upper side of the pressing portion 70. In the above configuration, the jig 80 can be assembled to the holding part 70 without providing a fitting groove or the like for assembling the jig 80 to the holding part 70. Further, it is not necessary to provide a separate member for connecting the pressing portion 70 and the jig 80 in order to assemble the pressing portion 70 and the jig 80. Further, in the above configuration, the jig 80 is movable up and down by the length of the region 80a in the vertical direction.

  In the above configuration, the upper surface 72 of the pressing portion is arranged in parallel with the upper surface 34 of the transport portion. In the above configuration, since the upper surface 34 of the transport unit is parallel to the upper surface 72 of the holding unit, the lower side of the jig can be used as long as the surfaces of the connecting portions 84 that are in contact with the upper surface 72 of the holding unit are both flat. The surface 83 is arranged in parallel with the upper surface 34 of the transport unit. The distance between the lower surface 83 of the jig and the upper surface 34 of the conveying unit can be kept constant. Therefore, the magnitude of the force applied from the jig 80 to the screw can be made uniform regardless of the position of the jig 80 in the transport direction.

  The jig 80 is provided with a positioning groove 89, and a part of the configuration of the automatic screw tightener is locked in the positioning groove 89. In FIG. 3, the connecting member 33 and the positioning groove 89 that connect the transport unit 30 and the pressing unit 70 are locked. The connection member 33 extends in the width direction perpendicular to the transport direction and the up-down direction, and the positioning groove 89 has a surface extending vertically on both sides of the connection member 33 in the transport direction. Therefore, even if the force which moves to the conveyance direction is added to the jig | tool 80, the jig | tool 80 can suppress that the jig | tool 80 moves to a conveyance direction by contact | abutting the positioning groove 89 and the connection member 33. FIG.

  In the configuration of the present embodiment, as shown in FIG. 5, the tip of the jig 80 in the conveyance direction has an escape taper 88 that is inclined with respect to the conveyance direction. The escape taper 88 is inclined in the same direction as the direction in which the screw is separated from the transport unit 30 by the escape mechanism 50. In the above configuration, since the escape taper 88 exists on the upper side with respect to the screw until immediately before the screw is separated from the conveying portion by the escape mechanism 50, it is possible to suppress the screw from jumping out and dropping at the time of separation.

(Other embodiments)
As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, and the following embodiment is also contained in the technical scope of this indication, and also a summary other than the following is given. Various modifications can be made without departing from the scope.

  For example, in the first embodiment, the jig 80 is movable up and down by its own weight. However, the jig 80 is moved up and down by applying a vertical force with another member such as a motor instead of the weight of the jig. It may be configured to be movable.

  In the first embodiment, the weight 85 is movable in the transport direction, but may be configured to be movable in the vertical direction.

  In the first embodiment, a single hole 86 provided in the jig 80 has been described. However, a plurality of holes 86 may be provided in the jig 80.

  In the first embodiment, the jig 80 is described as having a configuration including the weight 85, but may be configured so as not to include the weight 85.

  In the first embodiment, the first leg portion 81, the second leg portion 82, and the connection portion 84 may be integrally formed. Alternatively, a part of them may be formed separately or all of them may be formed separately.

DESCRIPTION OF SYMBOLS 1 ... Automatic screw fastening system, 20 ... Rotary drum, 30 ... Conveyance part, 31 ... Vertical groove, 32 ... Tip part, 33 ... Connection member, 34 ... Conveyance 35 ... base end part, 40 ... vibration part, 50 ... escape mechanism, 51 ... locking claw, 52 ... slide body, 53 ... block body, 60・ ・ ・ Drive bit, 70 ・ ・ ・ Pressing part, 71 ・ ・ ・ End of pressing part, 72 ・ ・ ・ Upper surface of pressing part, 80 ・ ・ ・ Jig, 80a ・ ・ ・ Area, 81 ・ ・ ・ No. 1 leg portion, 81a ... lower end portion of the first leg portion, 82 ... second leg portion, 82a ... lower end portion of the second leg portion, 83 ... lower side of the jig Surface, 84... Connection portion, 85... Weight, 86... Hole, 87. Inclined portion, 88... Escape taper, 89. ..Screw, 91a ... head, 91b ... below neck, 92 ... washer, 93 ... spring washer, a ... locking position, b ... work fastening position, S ... Tip screw

Claims (4)

A transport section (30) for transporting screws;
A vibration unit (40) for propelling a screw from a base end to a tip end on the transport unit by applying vibration to the transport unit;
An escape mechanism (50) that locks the screw located at the tip, and moves the screw to a position where the screw is separated from the transport unit and fastened to the workpiece;
A holding part (70) which is located on the upper side with respect to the screw located on the conveying part and prevents the screw from jumping upward;
An automatic screw tightening machine, comprising: a jig (80) that is attached to a position facing the tip of the pressing portion so as to be movable in the direction of gravity and presses a screw positioned on the conveying portion from above.   The automatic screw tightening machine according to claim 1, wherein the jig includes a weight (85) movable in a transport direction in which a screw is transported on the transport unit.   Of the surface of the jig that faces the transport unit, an end portion on the base end side has an inclined portion (87) that is inclined so as to move away from the transport portion toward the base end side. The automatic screw tightening machine according to claim 1 or 2. When the direction perpendicular to the conveying direction and the vertical direction in which the screw is conveyed on the conveying unit is the width direction,
The jig is
A first leg (81) and a second leg (82) projecting downward and having lower end portions spaced apart from each other in the width direction;
A connection portion (84) for connecting upper portions of the first leg portion and the second leg portion in the width direction;
The range of the pressing portion facing the tip is sandwiched between the first leg portion and the second leg portion on both sides in the width direction, and is in contact with the connection portion on the upper surface (72) of the pressing portion. The automatic screw tightening machine according to any one of claims 1 to 3.

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