JP5937927B2 - Adsorption mechanism - Google Patents

Description

  The present invention relates to an adsorption mechanism for stably adsorbing and holding a headed rod-like member such as a screw whose head diameter is larger than the shaft diameter.

  Conventionally, as a means for sucking and holding a head-like rod-like member such as a screw, a suction mechanism 100 based on an air suction system shown in Patent Document 1 is generally widely known, and cross-sectional views of main parts thereof are shown in FIGS. 4 and 5. The suction mechanism 100 sucks and holds a screw W, which is an example of a headed rod-like member, by sucking air, and a bit 102 having an engaging portion 102a that engages with the head of the screw W, A metal fitting 103 fixed to the bit 102 and a screw guide 110 including the metal fitting 103 are included. The bit 102 is connected to a rotary drive source and a reciprocating drive source (not shown), and the screw guide 110 is connected to suction means (not shown) capable of sucking the air 6. The metal fitting 103 is fixed to the tip end portion of the bit 102 so as to contain the engaging portion 102a, and is configured to be able to rotate and reciprocate together with the bit 102. Furthermore, one end of the metal fitting 103 is formed in accordance with the shape of the head of the screw W. For example, the metal fitting 103 is formed such that the plane is a curve in FIG. 4 and the cross section is a curve in FIG. Since the suction mechanism 100 needs to suck and hold the head of the screw W at the tip of the engaging portion 102a by suction of air 6, a vent hole 103a extending over the entire length of the metal fitting 103 shown in FIG. Alternatively, any one of the ventilation grooves 104 connected to the engagement portion 102a of the bit 102 shown in FIG. 5 is provided. Thereby, when the suction means is operated, the air 6 near the tip of the engaging portion 102a passes through the vent hole 103a or the vent groove 104, and further, the outer periphery of the bit 102 and the inner wall surface of the screw guide 110 are separated. It is sucked by the suction means through the gap. That is, since the conventional suction mechanism 100 can suck the head of the screw W while being engaged with the bit 102, even if the tip of the bit 102 protrudes from the screw guide 110, the suction state of the screw W is changed. Can be maintained. For this reason, for example, even when screw tightening is narrow and a part of the tip of the screw guide 110 interferes with a workpiece (not shown), the screw W is used as a female screw (not shown) of the workpiece. There is a feature that can be screwed in securely.

Japanese Patent Publication No. 07-80101

  As described above, the conventional suction mechanism 100 has to set the outer diameter of the metal fitting 103 protruding from the screw guide 110 to be small in order to achieve fastening to a narrow screw tightening location. The wall thickness dimension is set thin. Accordingly, when the vent hole 103a of FIG. 4 is provided, there is a problem that the hole diameter of the vent hole 103a becomes very small and it is difficult to process the vent hole 103a.

  On the other hand, when the ventilation groove 104 of FIG. 5 is provided in the bit 102, there is a problem that it takes time to process the ventilation groove 104. This is because the ventilation groove 104 has to be machined along the direction in which the bit 102 extends, and this is a so-called milling process in which a rotating cutting tool is pressed against the bit 102 for cutting. This milling process generally takes more time than lathe processing, and is a factor that increases the processing cost.

  Further, if the conventional suction mechanism 100 is used for screwing into a deep counterbore, for example, the distance that the metal fitting 103 protrudes from the tip of the screw guide 110 must be set long. In other words, if a certain amount of protrusion from the screw guide 110 is required, the overall length of the metal fitting 103 is set to be long in accordance with the above-mentioned protrusion amount, and the screw guide 110 is sealed even if the metal fitting 103 protrudes to some extent. Must be close to Thus, by making the inside of the screw guide 110 close to a sealed state, the suction force of the air 6 on the tip side of the bit 102 can be maintained without change. However, as described above, since the overall length of the metal fitting 103 becomes longer, it becomes more difficult to process the small-diameter vent hole 103a, and the processing dimension of the vent groove 104 is longer and it takes time to process the vent groove 104. Therefore, the suction mechanism 100 that is used for screwing particularly into a deep counterbore hole has a problem that the processing time of the vent hole 103a or the vent groove 104 is significantly increased, which further increases the cost.

The present invention has been made in view of the above problems, and can maintain the suction of the screw even if the bit that sucked the screw protrudes from the screw guide, can easily process the air suction path, and can reduce the manufacturing cost. The purpose is to provide an adsorption mechanism. In order to achieve this object, the present invention provides a suction mechanism comprising a bit that rotates under the drive of a rotational drive source, a metal fitting inserted through the bit, and a screw guide that includes the outer periphery of the metal fitting. In
The bit includes an engaging portion that engages with the head of a headed bar-like component, a large-diameter shaft portion that is always in contact with the inner wall surface of the metal fitting, and a small-diameter shaft portion that connects the large-diameter shaft portion and the engaging portion The metal fitting is fixed to the large-diameter shaft portion, and a ventilation groove is formed at one end of the metal fitting, and the boundary between the small-diameter shaft portion and the large-diameter shaft portion is located in the ventilation groove. It is characterized by becoming.

  Since the suction mechanism 1 of the present invention can perform the machining of the small-diameter shaft portion 2b by a lathe process that is easier than the above-described milling process, the suction mechanism 1 of the part that forms the suction path of the air 6 includes the machining of the ventilation groove 3a. There is an advantage that the processing time can be shortened compared to the conventional method and the cost of parts can be reduced. Further, when the screw W that has been adsorbed as described above is supplied to a deep counterbore or the like, the overall length of the metal fitting 3 must be increased. However, even in this case, the processing of the small-diameter shaft portion 2b can be easily performed by lathe processing as described above, and the processing length of the ventilation groove 3a is equal to that of the metal fitting 3 having a short total length. The air groove 3a can be easily processed. For this reason, even when the suction mechanism 1 is used when the metal fitting 3 protrudes a lot from the screw guide 10, the advantage that the processing of the bit 2 and the metal fitting 3 becomes much easier than before. There is also.

It is sectional drawing of the adsorption | suction mechanism concerning this invention. It is a principal part side view concerning this invention. It is operation | movement explanatory drawing of the adsorption | suction mechanism concerning this invention. It is explanatory drawing which shows the conventional Example. It is explanatory drawing which shows another conventional Example.

  An embodiment of the present invention will be described below with reference to FIGS. The suction mechanism 1 of the present invention includes a bit 2 that rotates under the driving of a rotational drive source (not shown), a metal fitting 3 inserted and fixed to the bit 2, and a screw guide that includes an outer periphery of the metal fitting 3. 10.

  The bit 2 includes an engaging portion 2a that engages with a drive hole formed in the head of the screw W, a small-diameter shaft portion 2b having a diameter substantially equal to the maximum diameter of the engaging portion 2a, and the small diameter. A large-diameter shaft portion 2c larger than the outer diameter of the shaft portion 2b. As shown in FIGS. 1 and 3, the bit 2 is formed integrally with the engaging portion 2a, the small-diameter shaft portion 2b, and the large-diameter shaft portion 2c in this order from the tip. Further, since the small diameter shaft portion 2b and the large diameter shaft portion 2c are each formed in a round bar shape, a lathe or the like is used for the outer diameter processing of the small diameter shaft portion 2b, and the material is rotated by rotating the material. A cutting process is used in which the material is cut against the surface. By the way, the bit 2 is connected to the rotational drive source and a reciprocating means (not shown) capable of reciprocating, and rotates at a predetermined torque and rotational speed. Further, the bit 2 also moves in the axial direction. Is possible. The engaging portion 2a is formed in a hexagonal bar 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 outer diameter of the metal fitting 3 is set to be slightly larger than the maximum dimension of the head of the screw W, and the inner diameter is set to be substantially the same as the outer diameter of the large-diameter shaft portion 2c. . In addition, a vent groove 3a extending in the axial direction is formed at one end of the metal fitting 3, and the other end is formed in accordance with the shape of the head of the screw W. As shown in FIG. 2, the metal fitting 3 has the bit 2 inserted therein, and a boundary line between the large diameter shaft portion 2c and the small diameter shaft portion 2b is fitted in an intermediate position in the axial direction of the ventilation groove 3a. It is out. The metal fitting 3 and the bit 2 are fixed by adhesion, and the bit 2 and the metal fitting 3 are integrally formed.

  In the present embodiment, the mounting position of the metal fitting 3 is the intermediate position of the ventilation groove 3a, but is not limited to this as long as the suction path of the air 6 can be secured. Further, in the present embodiment, the ventilation groove 3a is formed in two places on the metal fitting 3, but is not limited to two places, for example, four places, etc., according to the weight of the screw W and the ability of the suction means. Needless to say, it may be changed as appropriate.

  The screw guide 10 includes the metal fitting 3 so as to be slidable, and the inner diameter thereof is set to be substantially the same as the outer diameter of the metal fitting 3. Thereby, the metal fitting 3 to which the rotation is applied by the rotation driving source is guided by the inner diameter of the screw guide 10, so that the bit 2 can be aligned. Further, since the screw guide 10 is connected to a suction means (not shown) capable of sucking the air 6, the air can be sucked from the inside of the screw guide 10.

  The operation of the suction mechanism 1 configured as described above will be described below. The bit 2 and the metal fitting 3 rotate while being guided and aligned with the inner wall surface of the screw guide 10 under the rotational drive of the rotational drive source. Further, since the suction means operates simultaneously with the rotation of the bit 2, the air near the tip of the screw guide 10 passes through the inner diameter of the metal fitting 3 and the ventilation groove 3 a as shown by a two-dot chain line in FIG. 1. It is sucked by the suction means via the order. As a result, when the screw W is supplied from the head to the tip of the screw guide 10, the screw W is sucked from the head to the inside of the screw guide 10. As a result, the screw W engages with the engaging portion 2 a and rotates while being in contact with the end surface of the metal fitting 3 and being sucked.

  Next, the operation until the screw W sucked by the suction mechanism 1 is screwed into the female screw 21 will be described with reference to FIG. Since the suction mechanism 1 is formed on the workpiece 20, it is transferred onto the screw 21 by a robot (not shown), and the reciprocating means is actuated upon completion of the transfer. As a result, as shown in FIG. 3, the screw W is kept adsorbed by the bit 2 even if it completely protrudes from the tip of the screw guide 10. This is because the inside of the screw guide 10 can be close to a hermetic state unless the ventilation groove 3a protrudes from the tip of the screw guide 10. Therefore, even when the workpiece 20 has a step as shown in FIG. 3 and the tip of the screw guide 10 cannot contact the inlet end surface of the female screw 21, the tip of the screw portion of the screw W is The bit 2 and the metal fitting 3 are securely adsorbed until guided by the female screw 21.

  Further, the suction mechanism 1 of the present invention arranges the pressure sensor capable of measuring a negative pressure between the suction means and the screw guide 10 so that the suction state of the screw W is always set to the detected pressure of the pressure sensor. It is possible to make a judgment based on this.

  The length in the axial direction of the small-diameter shaft portion 2b from the front end of the engaging portion 2a, the total length of the metal fitting 3, and the length of the ventilation groove 3a are determined from the end surface of the metal fitting 3 from the front end of the screw guide 10. Needless to say, the distance may be appropriately changed according to the protruding distance.

1 Adsorption mechanism (present invention)
2 Bit 2a Engagement part 2b Small diameter shaft part 2c Large diameter shaft part 3 Metal fitting 3a Ventilation groove 6 Air 10 Screw guide 20 Work 21 Female thread 100 Adsorption mechanism (conventional)
102 Bit 102a Engagement part 103 Metal fitting 103a Vent hole 104 Vent groove 110 Screw guide W Screw

Claims (1)

In a suction mechanism comprising a bit that rotates under the drive of a rotational drive source, a metal fitting inserted through the bit, and a screw guide that includes the outer periphery of the metal fitting,
The bit includes an engaging portion that engages with the head of a headed bar-like component, a large-diameter shaft portion that is always in contact with the inner wall surface of the metal fitting, and a small-diameter shaft portion that connects the large-diameter shaft portion and the engaging portion And consists of
The metal fitting is provided with a ventilation groove at one end thereof, and is arranged so that the ventilation groove is located at a boundary between the large diameter shaft portion and the small diameter shaft portion, and is fixed to the large diameter shaft portion. Characteristic adsorption mechanism.

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