JP6231902B2 - Adsorption mechanism - Google Patents

Description

  The present invention relates to an adsorption mechanism that stably adsorbs and holds a screw.

  Conventionally, as a means for sucking and holding a headed bar-like component such as a screw, an air suction type suction mechanism 100 shown in Patent Document 1 is used, and its structure is shown in FIGS. This conventional suction mechanism 100 sucks and holds a screw W, which is an example of a headed bar-like component, by suction of air, The metal fitting 103 adhered to the bit 102 and the screw guide 10 through which the metal fitting 103 can be inserted.

  The bit 102 is connected to a rotary drive source and a reciprocating drive source (not shown), and is connected to the engagement portion 102a, a small diameter shaft portion 102b connected to the engagement portion 102a, and the small diameter shaft portion 102b. A large-diameter shaft portion 102c having a larger diameter than the small-diameter shaft portion 102b. In addition, the engaging portion 102a is a hexagonal prism in FIG. 4, and has a cross-shaped cross section in FIG. 5, and is set according to the shape formed on the head of the screw.

  The metal fitting 103 is formed of a hollow pipe that can be inserted through the large-diameter shaft portion 102c, and includes a ventilation groove 103a that extends in the axial direction from an end surface thereof. The metal fitting 103 is inserted into the large-diameter shaft portion 102c, and is attached so that the ventilation groove 103a is located at the boundary between the large-diameter shaft portion 102c and the small-diameter shaft portion 102b. Is fixed at a position slightly protruding from one end of the metal fitting 103. The metal fitting 103 is fixed by adhesion, and an adhesive is applied in advance to the contact portion between the inner wall surface of the metal fitting 103 and the large-diameter shaft portion 102c. Therefore, the metal fitting 103 rotates and reciprocates together with the bit 102 without falling off the bit 102. Further, the metal fitting 103 is set to have substantially the same size as the head diameter of the screw W, and one end thereof is formed in accordance with the head shape of the screw W. The shape of the metal fitting 103 is set every time, for example, a plane as shown in FIG. 4 or a cross section as shown in FIG.

  The screw guide 10 is formed so that the metal fitting 103 can be inserted therethrough, guides the outer periphery of the metal fitting 103, and normally includes the bit 102 so as not to protrude. The screw guide 10 is connected to a suction means (not shown) for sucking air 6 from the tip thereof, and the air present in the vicinity of the tip of the screw guide 10 by the action of the suction means is the large diameter shaft. Suctioned to the part 102c side.

  The suction mechanism 100 configured as described above causes the air 6 near the tip of the engaging portion 102a to be moved into the vent hole 103a or the vent groove 104, the outer periphery of the bit 102, and the screw guide 110 by the operation of the suction means. Suction is performed from the gap with the wall surface to the suction means. As a result, the conventional suction mechanism 100 can suck the head of the screw W with the bit 102 engaged, so that even if the tip of the bit 102 protrudes from the screw guide 110, the screw W is sucked. Can be maintained. Therefore, as shown in FIG. 5, even if the work 20 has a protrusion and the screw guide 110 does not reach the tightening surface, the screw W can be securely inserted into the tap hole 21 of the work 20. There is a feature that can be screwed into.

Japanese Patent Application No. 2012-192337

  However, since the conventional suction mechanism 100 is configured by fixing the bit 102 and the metal fitting 103 by bonding, the excess adhesive protrudes into the ventilation groove 103a and the like when the above-described insertion is performed, so that the air 6 suction paths were sometimes blocked. Therefore, it is necessary to manage the amount of adhesive applied and to remove the protruding adhesive, and it takes time to assemble the bit 102 and the metal fitting 103, so that there is a problem that the manufacturing cost cannot be reduced. Further, since the metal fitting 103 is configured so that the large-diameter shaft portion 102c can be inserted therethrough, when the metal fitting 103 is inserted into the bit 102, a position where the engaging portion 102a slightly protrudes from one end of the metal fitting 103 as described above. It is difficult to fit accurately. That is, the engaging portion 102a engages with the head of the screw, and the tip of the metal fitting 103 is difficult to be disposed at a proper attachment position where it contacts the head of the screw. Positioning is very difficult. Thereby, for example, when the metal fitting 103 is fixed to the back of the large-diameter shaft portion 102c with respect to the regular mounting position, the metal fitting 103 does not contact the head of the screw, and there is a gap between the metal fitting 103 and the head. Arise. Therefore, when the metal fitting 103 protrudes from the tip of the screw guide 10, there is a problem that the screw cannot be sucked. On the other hand, when the metal fitting 103 is fixed to the front side of the large-diameter shaft portion 102c with respect to the normal attachment position, the engaging portion 102a is in a state of floating from the head of the screw. Therefore, in particular, when the engaging portion 102a has a cross-shaped cross section, there is a problem that the head portion of the screw is scraped off with an increase in tightening torque and cannot be fastened with a predetermined torque.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an adsorption mechanism with reduced manufacturing costs. In order to achieve this object, the present invention provides a metal fitting provided with a bit that is configured to be rotatable and reciprocating and that engages with a headed bar-like component, and an insertion hole that is disposed on the tip side of the bit and into which the bit can be inserted. And a screw guide that includes an outer periphery of the metal fitting, and the bit is fixed to the bit, and the bit is attached to the bit by suction of air and sucked to the tip side by suction of air. Is provided with an engaging portion that engages with the head of the head-shaped bar-like component at the tip, and further includes a small-diameter shaft portion that is continuous with the engaging portion and does not contact the insertion hole, and the small-diameter shaft portion A connecting shaft portion formed continuously with the connecting shaft portion and formed with an outer diameter larger than the connecting shaft portion. The metal fitting is screwed onto the connection shaft portion. And a ventilation groove arranged in a direction in which the insertion hole extends, and the ventilation groove is formed from one end of the metal fitting to the insertion hole, and is formed from the other end side of the metal fitting. The sucked air is configured to pass through a gap between the large-diameter shaft portion and the screw guide via the ventilation groove. The connection shaft portion includes a male screw that engages with the screwing portion, and a medium-diameter shaft portion that is set to have a diameter larger than the outer diameter of the male screw. It is desirable to include a female screw that is screwed into the screw and a medium-diameter hole portion that fits into the medium-diameter shaft portion. The large-diameter shaft portion is preferably formed by abutting one end of the metal fitting to the one end and fixing the metal fitting, and having an outer diameter larger than that of the screwing portion.

  The suction mechanism 1 of the present invention can fix the metal fitting 3 by screwing it into the connecting shaft portion 2c of the bit 2, so that it is not necessary to use an adhesive as in the prior art. The suction path is not blocked. Therefore, there is an advantage that the assembly time of the bit 2 and the metal fitting 3 can be shortened compared to the conventional case, and the manufacturing cost of the suction mechanism 1 can be reduced. The connecting shaft portion 2c of the bit 2 is composed of a male screw 2d and a medium-diameter shaft portion 2e having a diameter larger than the outer diameter of the male screw 2d. The portion 3c is composed of a female screw 3d that is screwed into the male screw 2d and a medium-diameter hole portion 3e that fits into the medium-diameter shaft portion 2e, so that the attached metal fitting 3 substantially coincides with the axis of the bit 2 Can be fixed as As a result, misalignment of the metal fitting 3 is unlikely to occur, and the adsorbed screw W can be reliably guided to the tap hole 21 formed in the workpiece 20, so that there is an advantage that occurrence of fastening abnormality such as oblique tightening is reduced. Further, since the large-diameter shaft portion 2f is formed with an outer diameter larger than that of the screwing portion 3c, when the metal fitting 3 is screwed to the bit 2, the end surface of the metal fitting 3 becomes the large diameter. It contacts the end surface of the shaft portion 2f. In other words, since the metal fitting 3 does not move in the axial direction any more, it is fixed at a proper mounting position very close to the design dimension. There is also an advantage that it is possible to greatly reduce the occurrence of a problem with a gap with the metal fitting 3 and the problem of scraping the drive hole formed in the head of the screw with the engaging portion 2a.

It is a partially cutaway sectional view of the adsorption mechanism concerning the present invention. It is a principal part expanded side view of the metal fitting of FIG. It is operation | movement explanatory drawing of another attraction | suction mechanism based on this invention. It is a partially cutaway sectional view of a conventional product. It is operation | movement explanatory drawing of a conventional product.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The suction mechanism 1 of the present invention includes a bit 2 that is connected to a rotation drive source and a reciprocating drive source (not shown) and that can rotate and reciprocate, a metal fitting 3 inserted and fixed to the bit 2, and an outer periphery of the metal fitting 3. And a screw guide 10.

  The bit 2 has an engagement portion 2a that engages with a drive hole formed in the head of a screw W that is an example of a head-like bar-shaped component, and a small diameter that is substantially the same as the maximum diameter of the engagement portion 2a. The shaft portion 2b includes a connecting shaft portion 2c having a size larger than the outer diameter of the small-diameter shaft portion 2b, and a large-diameter shaft portion 2f having a size larger than the outer diameter of the connecting shaft portion 2c. The The connecting shaft portion 2c includes a male screw 2d communicating with the small-diameter shaft portion 2b and a medium-diameter shaft portion 2e communicating with the male screw 2d and the large-diameter shaft portion 2f. That is, as shown in FIGS. 1 and 3, the bit 2 has, from its tip, the engaging portion 2a, the small diameter shaft portion 2b, the male screw 2d, the medium diameter shaft portion 2e, and the large diameter shaft portion 2f. In this order, they are integrally molded. The small-diameter shaft portion 2b, the medium-diameter shaft portion 2e, and the large-diameter shaft portion 2f are all round rods having different diameters and are formed on the same axis, and the medium-diameter shaft portion 2e The boundary surface with the large-diameter shaft portion 2 f is formed by a surface orthogonal to the axis of the bit 2. The engaging portion 2a is formed in a hexagonal shape as shown in FIGS. 1 and 2 or a cross shape as shown in FIG. 3, and is appropriately changed according to the type of the drive hole of the screw W to be used. Needless to say.

  The metal fitting 3 has an outer diameter dimension set to be slightly larger than the maximum dimension of the head of the screw W, and is connected to the insertion hole 3a through which the small diameter shaft portion 2b can be inserted and the connection shaft portion 2c. Threaded portion 3c. The screwing portion 3c is composed of a female screw 3d that can be screwed into the male screw 2c, and a medium-diameter hole portion 3e that fits into the medium-diameter shaft portion 2e. And can be mounted. Further, as shown in FIG. 2, the metal fitting 3 is provided with a ventilation groove 3b arranged along the axis thereof, and the ventilation groove 3b extends from the end surface of the medium-diameter hole portion 3e to the insertion hole 3a. It is formed up to the range. Further, the end surface of the medium diameter hole 3e is formed so as to be orthogonal to the axis of the metal fitting 3, and is configured to be in close contact with the boundary surface between the medium diameter shaft 2e and the large diameter shaft 2f. Is done.

  Next, attachment of the bit 2 and the metal fitting 3 will be described. The metal fitting 3 is inserted into the engagement portion 2a from the medium-diameter shaft portion 2e side and rotated, so that the female screw 3d is screwed into the male screw 2d, and the medium-diameter hole portion 3e is The medium diameter shaft portion 2e is fitted. Thereby, the metal fitting 3 is not attached to be inclined with respect to the axis of the bit 2.

  In addition, the metal fitting 3 is rotated until the end surface of the medium diameter hole portion 3e comes into close contact with the boundary surface between the medium diameter shaft portion 2e and the large diameter shaft portion 2f. The amount of protrusion of the engaging portion 2a is set according to the design dimension without specially adjusting the mounting position. The protruding amount of the engaging portion 2a is appropriately set according to the depth or type of the drive hole of the screw W to be used. The dimension is set so as to be in contact with the head of W, and is dimensioned so that the screw W can be normally fastened without causing a so-called ream out even if the screw W is fastened to the tap hole 21 formed in the work 20 with a predetermined torque. Is set. That is, the most suitable amount of protrusion of the engaging portion 2a is set so that the head of the screw W is restricted by the metal fitting 3 and the engaging portion 2a is slightly lifted from the drive hole of the screw W. Has been.

  Further, since the metal fitting 3 is configured to be attached by screwing into the male screw 2d as described above, for example, even if the engaging portion 2a is worn, only the bit 2 can be easily renewed. Can be exchanged for things. That is, there is an advantage that the metal fitting 3 which does not need to be replaced can be attached to a new bit and reused.

  The screw guide 10 has an inner diameter that includes the metal fitting 3 and is slidable, and is connected to suction means (not shown) capable of sucking air 6 existing in the inner diameter. Thereby, the air 6 can be sucked from the tip of the screw guide 10 and the screw W can be sucked from the tip of the metal fitting 3.

  Next, the operation of the adsorption mechanism 1 of the present invention will be described. The air 6 is sucked from the tip of the screw guide 10 by the operation of the suction means and the rotational drive source, and the large-diameter shaft portion 2f and the above-mentioned through the ventilation groove 3b from the insertion hole 3a of the rotating metal fitting 3 It passes through a gap with the inner wall surface of the screw guide 10. As a result, the screw W supplied to the tip of the screw guide 10 is sucked into the screw guide 10 from the head and engaged with the rotating engaging portion 2a, and the head is brought to the tip of the metal fitting 3. Abut. As described above, when the screw W and the metal fitting 3 come into contact with each other, the air 6 hardly flows into the inside from the tip of the screw guide 10. That is, the suction mechanism 1 according to the present invention has a structure in which dust around the screw guide 10 does not flow into the metal fitting 3 if the screw W is adsorbed to the metal fitting 3, so that the passage path of the air 6 is not easily clogged. There are advantages.

  Thus, when the screw W engages with the bit 2 and is adsorbed in contact with the tip of the metal fitting 3, the reciprocating drive source is actuated so that the bit 2 and the metal fitting as shown in FIG. As a result, the shaft portion of the adsorbed screw W comes into contact with the tap hole 21 eventually. The ventilation groove 3b is dimensioned in advance so as not to protrude from the tip of the screw guide 10, and specifically, the suction state is maintained until the screw W starts to be screwed into the tap hole 21. The axial dimensions of the metal fitting 3 and the bit 2 are set respectively.

  Thereafter, when the screw W starts to be screwed into the tap hole 21, the suction means stops air suction and the screw W is not attracted, but the screw W has already been slightly screwed into the tap hole 21. The screw W does not fall out of the tap hole 21. The rotational drive source is rotationally driven until a predetermined torque is reached. When the screw W reaches the predetermined torque and the fastening to the workpiece 20 is completed, the rotational drive is stopped. In response to the stop of the rotational drive source, the reciprocating drive source is operated in a return direction to return the bit 2 and the metal fitting 3 to their original positions.

DESCRIPTION OF SYMBOLS 1 Adsorption mechanism 2 Bit 2a Engagement part 2b Small diameter shaft part 2c Connection shaft part 2d Male thread 2e Medium diameter shaft part 2f Large diameter shaft part 3 Metal fitting 3a Insertion hole 3b Venting groove 3c Screw part 3d Female thread 3e Medium diameter hole part 6 Air 10 Screw guide W Screw

Claims (3)

A bit configured to be able to rotate and reciprocate and engage with a headed bar-shaped part, a metal fitting provided with an insertion hole arranged on the tip end side of the bit, and a screw guide including the outer periphery of the metal fitting In the suction mechanism that adheres the metal fitting to the bit and engages the head-shaped rod-like part with the bit by suction of air and sucks it to the tip side,
The bit includes an engagement portion that engages with the head of a head-shaped part having a head at a tip thereof, and further includes a small-diameter shaft portion that is continuous with the engagement portion and does not contact the insertion hole, and the small-diameter A connecting shaft portion connected to the shaft portion and formed to have an outer diameter larger than that of the small diameter shaft portion, and a large diameter shaft connected to the connecting shaft portion and formed to have an outer diameter larger than that of the connecting shaft portion. And consists of
The metal fitting includes a screwing portion screwed into the connection shaft portion, and a ventilation groove disposed in a direction in which the insertion hole extends,
The ventilation groove is formed from one end of the metal fitting to reach the insertion hole,
An adsorption mechanism configured to allow air sucked from the other end side of the metal fitting to pass through a gap between the large-diameter shaft portion and the screw guide via the ventilation groove. The connection shaft portion includes a male screw that engages with the screwing portion, and a medium-diameter shaft portion that is set to a diameter larger than the outer diameter of the male screw,
The suction mechanism according to claim 1, wherein the screwing portion includes a female screw that is screwed into the male screw, and a medium-diameter hole portion that fits into the medium-diameter shaft portion.   The large-diameter shaft portion is formed by abutting one end of the metal fitting on one end thereof and fixing the metal fitting, and has an outer diameter larger than that of the screwing portion. Item 3. The adsorption mechanism according to Item 2.

Images