WO2015045445A1

WO2015045445A1 - Bit connector and screw tightening device

Info

Publication number: WO2015045445A1
Application number: PCT/JP2014/057832
Authority: WO
Inventors: 義男佐藤; 成雄池野
Original assignee: 株式会社バンガードシステムズ
Priority date: 2013-09-27
Filing date: 2014-03-20
Publication date: 2015-04-02
Also published as: KR20160055854A; JPWO2015045445A1; CN105592985A

Abstract

A bit connector (30) is provided with: a shaft having formed therein an insertion opening (301) into which a bit is inserted along the center axis and having at least one hole (304) reaching from the outer peripheral surface to the insertion opening; fasteners (34, 35) which each have a part located within the insertion opening when the bit has not been inserted into the insertion opening and which are arranged in the at least one hole so that the fasteners (34, 35) can move in the direction intersecting the center axis; and an elastic retaining ring (38) for pressing the fasteners toward the center axis.

Description

Bit coupler and screw fastening device

The present invention relates to a technique for attaching a bit to a rotating shaft.

As a configuration for attaching a bit to a shaft, for example, there is a configuration disclosed in Patent Document 1. The shaft disclosed in Patent Document 1 is provided with a hole in a cylindrical portion, and a ball is accommodated in the hole. A part of the ball accommodated in the hole is pushed by a chuck provided on the outer peripheral surface of the shaft and protrudes into the hollow portion of the shaft. In the bit, a circumferential groove is provided in a portion inserted into the hollow portion of the shaft. When the ball of the sleeve engages with the groove portion of the bit, the bit does not move in the axial direction, and when the sleeve rotates, the bit also rotates as the sleeve rotates.

JP-A-4-365563

In the configuration disclosed in Patent Document 1, when the bit is attached to the shaft, the chuck is moved to move the ball to the gap between the shaft and the chuck, then the bit is inserted into the shaft, and the chuck is moved again. Move the ball to the hole in the shaft. Further, when removing the bit from the shaft, the ball is removed from the groove of the bit by moving the chuck and moving the ball to the gap between the shaft and the chuck. When the ball is removed from the groove of the bit, the bit can move in the axial direction, and the bit can be extracted from the shaft.
As described above, in the configuration disclosed in Patent Document 1, when the bit is attached to the shaft or when the bit is detached from the shaft, it is necessary to move the chuck, which takes time to replace the bit.

The present invention aims to facilitate the exchange of bits.

In one aspect of the present invention, an insertion port for inserting a bit along a central axis is formed, and a shaft in which at least one hole reaching from the outer peripheral surface to the insertion port is formed, and the bit is not inserted A fastener disposed in the at least one hole so that a portion thereof is located in the insertion port in a state and is movable in a direction intersecting the central axis, and has elasticity, and the fastener is disposed on the central axis A bit connector having a retaining ring that presses in the direction of the rim is provided.

In a preferred embodiment, the at least one hole includes two holes facing each other, and one fastener is disposed in each hole.

In a preferred embodiment, the outer peripheral surface is formed with two grooves along the circumferential direction, and an auxiliary snap ring is fitted in each groove, and the snap ring is fixed to the shaft by the two auxiliary snap rings. The

In a preferred embodiment, the fastener is a sphere.

In another aspect, the present invention provides a shaft in which an insertion port for inserting a bit is formed along a central axis and at least one hole extending from an outer peripheral surface to the insertion port is formed, and a direction intersecting the central axis A bit connector having a fastener disposed in the at least one hole so as to be movable, a retaining ring having elasticity and pressing the fastener in the direction of the central axis, and a recess on the outer peripheral surface Provided is a screw tightening device that includes the bit that is formed and fixed to the shaft when the concave portion is hooked on the fastener, and a drive unit that rotates the central axis.

In a preferred aspect, the screw tightening device further includes a cover that covers the bit, and a case that fixes the cover, accommodates the drive unit therein, and includes a passage passage that leads to the gap. The air is sucked and discharged out of the case.

According to the present invention, bit replacement can be facilitated as compared with a configuration in which the chuck is moved to replace the bit.

The figure which showed the external appearance of the screw fastening apparatus 1 which concerns on one Embodiment of this invention. Sectional drawing of the screw fastening apparatus 1. FIG. The front view and right view of the bit 10. FIG. The figure which showed the external appearance of the motor 30, and the edge part of the shaft 31. FIG. The figure for demonstrating operation | movement when mounting | wearing the screw fastening apparatus 1 with the bit 10. FIG. The figure which showed the external appearance of the pin which concerns on a modification. The figure which showed the cross section of the insertion part 103 which concerns on a modification.

[Embodiment]
FIG. 1 is an external view of a screw tightening device 1 according to an embodiment of the present invention. The screw tightening device 1 is an adsorption-type screw tightening device that sucks air around the tip of the bit into the device and sucks the screw to the tip of the bit. Hereinafter, for convenience of description, the side with the bit in the screw fastening device 1 is referred to as a front side, and the side opposite to the side with the bit is referred to as a rear side.

FIG. 2 is a cross-sectional view of the screw fastening device 1. A rear cover 15 that closes the rear side of the main body case 14 is attached to the rear side of the main body case 14. A part of the main body case 14 is provided with a passage 141 that penetrates from the front side to the rear side of the main body case 14 and serves as an air passage.
A connector 20 to which a control cable is connected is attached to the rear cover 15. When a signal for controlling the motor is supplied from the control cable to the connector 20, the motor 30 for rotating the bit 10 is driven, and the rotational speed of the bit 10 and the tightening torque of the screw are controlled. In addition, a hollow coupling machine 21 to which a tube for sucking air sucked from the periphery of the tip of the bit 10 from the screw fastening device 1 is connected is attached to the rear cover 15.

The motor 30 is a motor for rotating the bit 10. The motor 30 is fixed to the motor mounting mount 13 that closes the front side of the main body case 14 with screws, and is positioned in the main body case 14 as shown in FIG. A part of the motor mounting mount 13 is provided with a passage 131 that penetrates from the front side to the rear side and serves as an air passage.

The cylindrical coupling joint 16 is a coupling for coupling the passage 141 and the passage 131. As shown in FIG. 2, the front side of the coupling joint 16 is contained in the motor mounting mount 13, and the rear side is contained in the main body case 14.
The cylindrical O-ring holder 17 is a component that holds an O-ring 171 that prevents air sucked from around the tip of the bit 10 from flowing into the main body case 14. The O-ring holder 17 is attached to the front side of the motor mounting mount 13. The bit 10 is supported by the O-ring holder 17 and the O-ring 171, and the movement of the bit 10 in the radial direction is restricted.

The holding machine 12 is a cover that covers the O-ring holder 17 and the bit 10 and is attached to the motor mounting mount 13 by screws. Note that the inner diameter of the space in the holder 12 is larger than the diameter of the bit 10 at any position, and there is a gap between the bit 10 and the holder 12. When the retainer 12 is attached to the motor attachment mount 13, the space in the retainer 12 is connected to the passage 131.
The first cover 11 </ b> A and the second cover 11 </ b> B are covers that cover the front side of the center of the bit 10. The second cover 11B is attached to the front side of the retainer 12, and the first cover 11A is attached to the front side of the second cover 11B.

In FIG. 2, the flow of air sucked from the periphery of the tip of the bit 10 is indicated by arrows. Since the air in the tube connected to the coupling machine 21 is sucked by a pump connected to the tube, the air in the passage 141 leading to the coupling machine 21 flows from the coupling machine 21 to the tube. Since the passage 141 is connected to the passage 131 via the coupling joint 16, when the air in the passage 141 flows to the rear side, the air in the coupling joint 16 and the air in the passage 131 flow toward the passage 141. .
Further, since the passage 131 is connected to the space in the holder 12, when the air in the passage 131 flows to the rear side, the air in the holder 12 flows toward the passage 131. In the O-ring holder 17, since the O-ring 171 is in contact with the bit 10, air on the front side of the O-ring holder 17 does not flow behind the O-ring 171, that is, in the main body case 14.

Since the inner diameter of the first cover 11A and the second cover 11B is larger than the outer diameter of the bit 10, there is a gap between the first cover 11A and the bit 10, and also between the second cover 11B and the bit 10. There is a gap. Since the hollow portion of the second cover 11B is connected to the space in the retainer 12, when the air in the retainer 12 flows rearward, the air in the gap between the bit 10 and the second cover 11B is retained in the retainer 12. The air in the gap between the bit 10 and the first cover 11A flows to the second cover 11B side. When the air in the gap between the bit 10 and the first cover 11A flows rearward, the air around the tip of the bit 10 is sucked into the gap between the bit 10 and the first cover 11A. When the tip of the bit 10 is brought close to the head of the screw, the screw is adsorbed to the tip of the bit 10 as the air around the tip of the bit 10 is sucked into the first cover 11A.

Next, the structure which attaches the bit 10 to the screw fastening apparatus 1 is demonstrated. FIG. 3 is a front view and a right side view of the bit 10. The bit 10 is a bit for tightening the cross-recessed machine screw. The bit 10 includes a first shaft portion 101, a second shaft portion 102, and an insertion portion 103. The tip of the first shaft portion 101 has a shape that fits into the cross hole of the screw, and the other portion of the first shaft portion 101 has a circular cross section viewed from the axial direction.
The second shaft portion 102 has a circular cross section when viewed from the axial direction, and has a larger diameter than the first shaft portion 101. Note that the second shaft portion 102 is tapered toward the first shaft portion 101 side.
The insertion portion 103 is plate-shaped and has a rectangular shape when viewed in plan. The insertion portion 103 has a first surface 1031 that is flat along the axial direction, and a second surface 1032 that is also flat along the axial direction. Further, the insertion portion 103 has a hole 1033 that penetrates the insertion portion 103 from the first surface 1031 toward the second surface 1032.
The hole 1033 is an example of a concave portion on which a first sphere 34 (described later) is applied and a concave portion on which the second sphere 35 is applied. The central axis of the hole 1033 intersects the central axis of the bit 10.

4A is a front view of the motor 30, FIG. 4B is an enlarged view of the end of the shaft 31 of the motor 30, FIG. 4C is a cross-sectional view of the end of the shaft 31, and FIG. FIG. 4D is a diagram illustrating a cross section of an end portion of the shaft 31 and parts disposed at the end portion of the shaft 31.
The shaft 31, the first sphere 34, the second sphere 35, and the third retaining ring 38 constitute a bit connector. The shaft 31 is a rotating shaft obtained by processing a metal cylinder, and an insertion port 301 formed by cutting along the axial direction of the shaft 31 is provided at the tip. The cross section of the insertion port 301 is circular. Hereinafter, one of the shafts 31 that sandwiches the insertion port 301 is referred to as a first end 310, and the other of the shaft 31 that sandwiches the insertion port 301 is referred to as a second end 320.

The first end 310 and the second end 320 are provided with a groove 302 and a groove 303 along the circumferential direction of the shaft 31. In the first end portion 310, a hole 304A into which the first sphere 34 is inserted is provided between the groove 302 and the groove 303, and in the second end portion 320, the second sphere 35 is inserted. A hole 304 </ b> B is provided between the groove 302 and the groove 303. Note that the hole 304A and the hole 304B have a circular shape when viewed in the radial direction of the shaft 31, and the diameter of the central axis side of the shaft 31 is the outer peripheral side of the shaft 31 as shown in FIG. It is smaller than the diameter.

The first sphere 34 and the second sphere 35 are fasteners for supporting the bit 10 and are metal spheres. The first sphere 34 is inserted into the hole 304A, and the second sphere 35 (second fastener) is inserted into the hole 304B (second hole). The diameter of the first sphere 34 is larger than the diameter on the central axis side of the hole 304A, and the diameter of the second sphere 35 is larger than the diameter on the central axis side of the hole 304B.

As shown in FIG. 4D, the first retaining ring 36 is fitted in the groove 302, and the second retaining ring 37 is fitted in the groove 303. In addition, as shown in FIG. 4D, a third retaining ring 38 is fitted between the first retaining ring 36 and the second retaining ring 37.
The first retaining ring 36 and the second retaining ring 37 are parts for preventing the third retaining ring 38 from moving in the axial direction of the shaft 31. The first retaining ring 36 and the second retaining ring 37 are made of metal, and are so-called C-rings whose shape viewed from the axial direction is an alphabet C shape.
The third retaining ring 38 is a component that pushes the first sphere 34 and the second sphere 35 in the direction of the central axis of the shaft 31, that is, in the direction of the

holes

304A and 304B. The third retaining ring 38 is made of metal, and the shape viewed from the axial direction is an alphabet C shape. The third retaining ring 38 has elasticity and is elastically deformed in the direction of the inner diameter or the outer diameter. Since the outer diameters of the first retaining ring 36 and the second retaining ring 37 are larger than the outer diameter of the third retaining ring 38, the movement of the third retaining ring 38 toward the end side is prevented.

FIG. 5 is a view for explaining the operation when the bit 10 is mounted on the screw tightening device 1. As shown in FIG. 5A, when the insertion portion 103 is not positioned in the groove 302, the first ball 34 inserted into the hole 304A is pushed by the third retaining ring 38. Thus, the second sphere 35 that protrudes toward the central axis side of the shaft 31 and is inserted into the hole 304B also protrudes toward the central axis side of the shaft 31 by being pushed by the third retaining ring 38. When the bit 10 is moved rearward from the state shown in FIG. 5A in order to attach the bit 10 to the screw fastening device 1, the insertion portion 103 enters the groove 302, and the insertion portion 103 is connected to the first ball 34. It reaches between the second spheres 35. When the bit 10 is further moved to the rear side, the first surface 1031 pushes the first sphere 34 toward the outer peripheral side of the shaft 31, and the second surface 1032 pushes the second sphere 35 toward the outer peripheral side of the shaft 31. 103 enters between the first sphere 34 and the second sphere 35 as shown in FIG.

When the bit 10 further moves rearward from the state shown in FIG. 5B, the hole 1033 reaches between the first sphere 34 and the second sphere 35. When the hole 1033 reaches between the first sphere 34 and the second sphere 35, the first sphere 34 and the second sphere 35 are pushed toward the hole 1033 by the third retaining ring 38. Then, as shown in FIG. 5C, a part of the first sphere 34 protrudes from the hole 304A and enters the hole 1033, and a part of the second sphere 35 protrudes from the hole 304B and enters the hole 1033. As a result, the first sphere 34 and the second sphere 35 are engaged with the hole 1033, and the bit 10 is supported by the first sphere 34 and the second sphere 35 at the position shown in FIG. When the shaft 31 rotates from the state shown in FIG. 5C, the first sphere 34 and the second sphere 35 rotate while supporting the insertion portion 103.

When removing the bit 10 from the screw fastening device 1, when the bit 10 is pulled forward from the state of FIG. 5C, the first surface 1031 pushes the first ball 34 toward the third retaining ring 38, The second surface 1032 pushes the second sphere 35 toward the third retaining ring 38, and the insertion portion 103 enters between the first sphere 34 and the second sphere 35 as shown in FIG. When the bit 10 is further moved to the front side from the state of FIG. 5B, the insertion portion 103 is detached from between the first sphere 34 and the second sphere 35 and becomes the state of FIG. Can be removed from the screwing device 1.

When the bit 10 is attached to the screw fastening device 1, the insertion portion 103 is positioned in the groove 302 by moving the screw fastening device 1 in the axial direction of the bit 10 with respect to the fixed bit 10. You may do it. Further, when removing the bit 10 from the screw fastening device 1, the insertion portion 103 may be detached from the groove 302 by fixing the bit 10 and moving the screw fastening device 1 in the axial direction of the bit 10. .

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

In the embodiment described above, the screw tightening device 1 is an adsorption-type screw tightening device. However, the bit 10 may be configured to adsorb the screw by magnetic force, or may not be configured to adsorb the screw to the bit. May be. In the above-described embodiment, the bit 10 corresponds to the cross-recessed machine screw, but the tip of the bit 10 has a shape that fits in the thread of the screw corresponding to the screw with the slot. It may be. Further, the bit 10 does not correspond to a screw, and may have another shape such as a drill.

In the embodiment described above, the part that is inserted into the hole 304A and the hole 304B and supports the bit 10 may not be a sphere. For example, as shown in FIG. 6A, a pin 50 having one end of a cylinder processed into a hemispherical shape is inserted into the hole 304A and the hole 304B, and the hemispherical portion is engaged with the hole 1033 to support the bit 10. It is good also as a structure. Further, as shown in FIG. 6B, the pin 51 having one end of the cylinder processed into a conical shape is inserted into the hole 304A and the hole 304B, and the conical portion is engaged with the hole 1033 to support the bit 10. It is good also as a structure.

In the embodiment described above, the hole 304A and the hole 304B have a circular shape when viewed in the radial direction of the shaft 31, but the shape of the hole is not limited to a circular shape. For example, the shape of the shaft 31 when viewed in the radial direction may be a polygon such as a rectangle, a hexagon, or an octagon.

In the embodiment described above, the portion engaging with the first sphere 34 and the second sphere 35 in the insertion portion 103 is the hole 1033, but the portion engaging with the first sphere 34 and the second sphere 35 is not a through hole. May be.
For example, as shown in FIG. 7, the insertion portion 103 may have a recess 1034A in which a part of the first sphere 34 enters and a recess 1034B in which a part of the second sphere 35 enters. Note that the shape of the concave portion 1034A and the concave portion 1034B when viewed in the depth direction may be circular or polygonal.

In the embodiment described above, the shaft 31 is formed by processing a metal cylinder. However, the shaft 31 is formed by processing a metal polygonal column whose shape when viewed in the axial direction is a polygon. 304A and hole 304B may be provided. Even when the shape of the shaft 31 when viewed in the axial direction is a polygon, the central axis of the shaft 31 passes through the insertion port 301.

In the embodiment described above, the first sphere 34, the second sphere 35, and the third retaining ring 38 are separate parts, but the first sphere 34, the second sphere 35, and the third retaining ring 38 are It may be integrated.

In the embodiment described above, the bit 10 is connected to the shaft 31 of the motor 30, but the present invention is not limited to this configuration. For example, one end of the rotary shaft connected to the shaft 31 is processed in the same manner as the end portion of the shaft 31 of the above-described embodiment, and the first sphere 34, the second sphere 35, and the third sphere disposed in the processed portion. The bit 10 may be supported by the retaining ring 38.

In the embodiment described above, the first end portion 310 has the hole 304A and the second end portion 320 has the hole 304B. However, the present invention is not limited to this configuration. For example, a configuration may be adopted in which either one of the hole 304A and the hole 304B is not provided, and the bit 10 is supported by any one of the first sphere 34 or the second sphere 35.
In short, the bit connector of the present invention has a shaft in which an insertion port for inserting a bit is formed along a central axis, at least one hole reaching from the outer peripheral surface to the insertion port, and the bit is inserted. A fastener disposed in the at least one hole so that a portion thereof is located in the insertion opening and is movable in a direction crossing the central axis in a state where the fastener is not disposed; It is only necessary to have a retaining ring that presses in the direction of the shaft.

In the above-described embodiment, the air sucked from the periphery of the tip of the bit 10 is discharged from the rear cover 15 to the outside of the screw fastening device 1, but a tube is connected to the passage 141 and the air in the tube is pumped. You may suck. Alternatively, a tube may be connected to the passage 131 without providing the passage 141, and the air in the tube may be sucked with a pump.

In the embodiment described above, the first sphere 34 and the second sphere 35 are made of metal. However, the first sphere 34 and the second sphere 35 are not limited to metal, and may be made of other materials such as synthetic resin. Good. Further, the first retaining ring 36, the second retaining ring 37, and the third retaining ring 38 may be made of other materials such as synthetic resin instead of metal.

DESCRIPTION OF SYMBOLS 1 ... Screw fastening apparatus, 10 ... Bit, 11A ... 1st cover, 11B ... 2nd cover, 12 ... Holding machine, 13 ... Motor mounting mount, 14 ... Body case, 15 ... Rear cover, 16 ... Connection joint, 17 ... Oh Ring holder, 30 ... motor, 31 ... shaft, 34 ... first sphere, 35 ... second sphere, 36 ... first retaining ring, 37 ... second retaining ring, 38 ... third retaining ring, 103 ... insertion portion, 131 ... passage, 141 ... passage, 171 ... o-ring, 301 ... insertion port, 302, 303 ... groove, 304A, 304B ... hole, 310 ... first end, 320 ... second end, 1033 ... hole

Claims

A shaft in which an insertion port for inserting a bit along the central axis is formed, and at least one hole extending from the outer peripheral surface to the insertion port is formed;
A fastener disposed in the at least one hole so that a part of the bit is located in the insertion slot and is movable in a direction intersecting the central axis when the bit is not inserted;
A bit connector having elasticity and a retaining ring that presses the fastener in the direction of the central axis.
The at least one hole includes two holes facing each other via the central axis;
The bit connector according to claim 1, wherein one fastener is disposed in each hole.
Two grooves are formed on the outer circumferential surface along the circumferential direction,
Each groove is fitted with an auxiliary retaining ring,
The bit connector according to claim 1 or 2, wherein the retaining ring is fixed to the shaft by two auxiliary retaining rings.
The bit connector according to any one of claims 1 to 3, wherein the fastener is a sphere.
A shaft in which an insertion port for inserting a bit along the central axis is formed, and at least one hole extending from the outer peripheral surface to the insertion port is formed;
A fastener disposed in the at least one hole so as to be movable in a direction intersecting the central axis;
A bit connector having elasticity and a retaining ring that presses the fastener in the direction of the central axis;
A recess is formed on the outer peripheral surface, and the bit fixed to the shaft by the recess hanging on the fastener, and
A screw tightening device comprising: a drive unit that rotates the shaft.
A cover covering the bit;
A case that fixes the cover, accommodates the drive unit therein, and has a passage that leads to the gap;
The screw tightening device according to claim 5, wherein air in the passage is sucked and discharged out of the case.