JP2014133268A - Center deflection prevention structure of driver bit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center deflection prevention structure of a driver bit which can sufficiently prevent center deflection of the driver bit even if the driver bit has a longer length.SOLUTION: A center deflection prevention structure of a driver bit can prevent center deflection of the driver bit when a screw is withdrawn by the driver bit which is assembled to a rotation drive part on a base end side thereof. The center deflection prevention structure is equipped with an intermediate part position regulation part 13 which contacts an intermediate part between the base end and the tip of the driver bit and regulates movement of the intermediate part in a direction diagonal to an axis of the driver bit, and a tip position regulation part 14 which contacts the tip of the driver bit and regulates movement of the tip in a direction diagonal to the axis of the driver bit.

Description

  The present invention relates to a structure for preventing runout of a driver bit.

Conventionally, as a structure for preventing the centering of a driver bit, Patent Document 1 discloses that a driver bit abutting portion is provided on the inner periphery of the tip of an operation sleeve provided at the tip of a spindle for mounting and removing the driver bit. A structure is described in which the bit abutting portion is brought into contact with the driver bit to prevent the driver bit from being run out.
Further, in Patent Document 2, two elastic holding pieces are provided on an operation sleeve provided at the tip of a spindle for assembling / removing a driver bit, and the driver bit is elastically sandwiched from both sides by these elastic holding pieces. The structure for preventing the runout of the driver bit is described.

JP 2011-230208 A JP 2002-205281 A

      In each of the above-described conventional drive-by bit core runout prevention structures, the driver bit runout is prevented by restricting the movement of the middle portion of the driver bit in the longitudinal direction. When the length of the driver bit is short, the initial effect can be expected. However, when the length of the driver bit is increased to some extent, there is a problem that the center runout cannot be prevented.

    The present invention has been made in view of such circumstances, and even if the length of the driver bit is long, the runout prevention structure of the drive bit that can sufficiently prevent the runout It is an issue to provide.

The present invention employs the following means in order to solve the above problems.
That is, the drive bit core runout prevention structure according to the present invention prevents the driver bit from running out when the screw is removed by the driver bit whose base end is assembled to the rotation drive unit. An intermediate portion position restricting portion that is in contact with an intermediate portion between a base end and a distal end of the driver bit and restricts movement of the intermediate portion in a direction perpendicular to the axis of the driver bit; And a tip portion position restricting portion that contacts the tip portion of the driver bit and restricts the tip portion from moving in a direction perpendicular to the axis of the driver bit.

  In the present invention, the intermediate portion position restricting portion and the tip end position restricting portion restrict movement of the intermediate portion and the tip portion of the driver bit in a direction perpendicular to the axis of the driver bit. As described above, since the driver bit is steady at the two positions of the intermediate portion and the tip portion, even if the length of the driver bit is long, the center deflection can be sufficiently prevented.

The tip position restricting portion includes a ring member that is fitted on the outer periphery of the tip of the driver bit so as to be rotatable and movable in the axial direction of the driver bit, and the ring member is a screw into which the screw is inserted. The ring member may be externally fitted to the opening of the insertion hole to restrict the tip of the driver bit from moving in the direction perpendicular to the axis.
In this case, the ring member is positioned by being fitted around the opening of the screw insertion hole, and is restricted from moving in the radial direction of the screw insertion hole. For this reason, the tip end portion of the driver bit that is inserted into the center hole of the ring member and guided to the inner peripheral surface of the center hole is also restricted from moving in the radial direction of the screw insertion hole. The runout of the tip of the bit can be prevented.

The outer shape of the ring member may be formed in a tapered shape whose outer diameter gradually increases from the distal end toward the proximal end.
In this case, since the ring member is formed in a tapered shape, even when the diameters of the screw insertion holes are variously changed, the ring member is changed to the opening of the screw insertion holes having different diameters by changing the fitting position of the ring members. Can be fitted. In this way, the ring member can be fitted into screw insertion holes of different diameters without replacing the ring member.

The ring member may be divided into a plurality of pieces in a horizontally divided state from the distal end to the proximal end.
In this case, one or several of the ring member pieces divided into a plurality are fitted into the screw insertion holes, and the fitted ring member pieces guide the tip of the driver bit to be rotatable. Since the part that guides the driver bit in such a manner as to be rotatable is limited to one or several of the ring member pieces, the sliding that occurs between the driver bit and the ring member piece when the driver bit is rotated. Resistance can be reduced.

The intermediate position restricting portion includes a bearing support member supported by a support base that supports the rotation drive portion, and a bearing that is supported by the bearing support member and rotatably supports the intermediate portion of the driver bit. The structure provided may be sufficient.
In this case, the bearing is supported by the support base that supports the rotation drive unit via the bearing support member, and the support base that supports the rotation drive unit usually has high rigidity. The bearing can be supported with a strong force. For this reason, the runout of the middle part of the driver bit can be more effectively prevented.
Further, for example, by appropriately changing the length of the rod extending from the support base and supporting the bearing support member, the support position of the middle portion of the driver bit supported by the bearing can be arbitrarily changed.

  According to the present invention, since the driver bit is steady at two places, the middle part and the tip part, even if the length of the driver bit is long, the driver bit is sufficiently prevented from being run out. can do.

It is a perspective view of a screw detaching device provided with a core runout prevention structure of a driver bit to which the present invention is applied. It is a side view which shows the core runout prevention structure of a driver bit. It is a top view which shows the core runout prevention structure of a driver bit. It is sectional drawing which shows the intermediate part position control part of the centering prevention structure of a driver bit. It is a side view which shows the front-end | tip part position control part of the centering prevention structure of a driver bit. It is sectional drawing which shows the effect | action of the front-end | tip part position control part of the core deflection prevention structure of a driver bit. It is a side view which shows the other example of the front-end | tip part position control part of the core runout prevention structure of a driver bit.

Hereinafter, an embodiment of a driver bit center run prevention structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view of a screw detaching device having a driver bit center run prevention structure to which the present invention is applied, FIG. 2 is a side view showing the driver bit runout prevention structure, and FIG. 3 is a driver bit runout prevention structure. FIG.

As shown in FIG. 1, a screw removing device 1 shown here removes screws from an electric appliance E such as a television or a personal computer, and each electric appliance E uses a screw detection means such as a camera to remove a screw S. Is detected in advance, and the screw removal portion 2 is moved based on the detected data, and the tip of the driver bit 3 incorporated in the screw removal portion 2 is engaged with the screw S. Then, the screw S is rotated in the direction of loosening, and the screw S is removed (see FIG. 6).
As shown in FIG. 1, the screw detachment portion 2 can be moved in three axial directions along a transfer means for transferring the electric appliance E or the electric appliance. In FIG. 1, the longitudinal direction of the electrical appliance E is the X direction, the width direction of the electrical appliance E is the Y direction, and the height direction of the electrical appliance E is the Z direction.

  The screw detachment unit 2 includes a rotation driving unit 10 such as a motor, and the driver bit 3 incorporated in the rotation driving unit 10 and rotated by the rotation driving unit 10. The rotation drive unit 10 is supported by a support base 11. An operation sleeve (both not shown) is attached to the tip of the spindle, which is the output shaft of the rotation drive unit 10, and the operation bit is moved in the axial direction of the spindle, whereby the driver bit 3 is assembled to the spindle. Alternatively, the driver bit 3 can be removed from the spindle. Since such a configuration is known, it is omitted here.

The driver bit 3 has a proximal end assembled to the spindle of the rotary drive unit 10, and an engagement protrusion 12 formed in a + shape (or − shape) at the distal end is formed in the engagement groove Sa of the head of the screw S. Engaged.
That is, the screw detachment portion 2 abuts against an intermediate portion 3A between the base end and the distal end of the driver bit 3, and the intermediate portion position where the intermediate portion 3A restricts movement in a direction perpendicular to the axis of the driver bit 3. A restricting portion 13 and a tip portion position restricting portion 14 that abuts the tip portion 3B of the driver bit 3 and restricts the tip portion 3B from moving in a direction orthogonal to the axis of the driver bit 3 are provided.

FIG. 4 is a cross-sectional view showing the intermediate position restricting portion 13. As shown in this figure, the intermediate position restricting portion 13 includes a bearing support member 16 supported on the lower side of the support base 11 via a rod 15 and a bearing 17 supported by the bearing support member 16. . The driver bit 3 is inserted into the center hole of the bearing support member 16 and the center hole of the bearing 17, and the intermediate portion 3 </ b> A of the driver bit 3 is supported while being in contact with the inner cylinder portion 17 </ b> A of the bearing 17. The intermediate portion 3A is restricted from moving in a direction orthogonal to the axis of the driver bit 3.
In FIG. 4, an example of a ball bearing is given as the bearing 17, but the bearing is not necessarily limited to a ball bearing, and may be a roller bearing or a sleeve bearing.

FIG. 5 is a side view showing the tip position restricting portion, and FIG. 6 is a cross-sectional view showing the operation of the tip position restricting portion.
As shown in these figures, the tip position restricting portion 14 includes a ring member 20 that is fitted to the outer periphery of the tip portion 3B of the driver bit 3 so as to be rotatable and movable in the axial direction of the driver bit. The ring member 20 can be fitted into the opening Ha of the screw insertion hole H formed in the electrical appliance E, into which the screw S is inserted and set. A central hole 21 is formed in the ring member 20, and the tip 3 </ b> B of the driver bit 3 is inserted into the central hole 21. The inner diameter of the center hole 21 of the ring member is set to be slightly larger than the outer diameter of the tip 3B of the driver bit 3 so as to have a clearance. As a result, the tip 3B of the driver bit 3 is rotatable with respect to the ring member 20 and movable in the axial direction of the driver bit 3 as described above.

The outer periphery of the ring member 20 is formed in a tapered shape whose outer diameter gradually increases from the distal end toward the proximal end. Further, the ring member 20 is divided into a plurality along the proximal end from the distal end. That is, in this embodiment, the ring member 20 is constituted by a plurality of ring member pieces 20A,.
Further, a retaining ring 22 is attached to the distal end portion of the driver bit 3 closer to the distal end side than the fitting position of the ring member 20, thereby preventing the ring member 20 from coming off from the driver bit 3.
The ring member piece 20 </ b> A may be made of metal or resin, but in order to protect the driver bit 3, the ring member piece 20 </ b> A is preferably made of a material softer than the material constituting the driver bit 3.

Next, a method for removing the screw S from the electrical appliance E by the screw removing device 1 will be described.
First, the position of the screw S in the electrical appliance E is detected by the screw detection means. Based on this detection data, the screw removal portion 2 is moved by a moving mechanism (not shown), and the driver bit 3 incorporated in the screw removal portion 2 is disposed immediately above the screw S.

  Then, the screw detachment part 2 is lowered. Then, the rotation drive unit 10 and the driver bit 3 are lowered together with the support base 11, and the tip 3 </ b> B of the driver bit 3 is inserted into the screw insertion hole H of the electrical appliance E. At this time, among the plurality of ring member pieces 20A... Constituting the ring member 20 fitted to the outer periphery of the distal end portion 3B of the driver bit 3, the ring member piece 20A having an outer diameter is appropriately an opening portion of the screw insertion hole H. The ring member piece 20A located at the lowermost end is fitted to the opening Ha of the screw insertion hole H in FIG. In this state, the driver bit 3 is further lowered and reaches a height position where the engagement protrusion 12 at the tip can be engaged with the engagement groove Sa of the head of the screw S.

  Next, the rotation drive unit 10 is driven to rotate the driver bit 3 in a predetermined direction. At this time, when the engagement protrusion 12 at the tip of the driver bit 3 rotates appropriately and reaches a position where it can engage with the engagement groove Sa of the head of the screw S, the engagement protrusion 12 engages with the engagement groove Sa. (See FIG. 6). Since the driver bit 3 is pressed downward by, for example, pressing means using air pressure or the like, the engagement protrusion 12 is slightly lowered simultaneously with the engagement groove Sa of the head of the screw S, and this engagement state is Maintained.

  In this state, the driver bit 3 is further rotated by the rotation driving unit 10 to rotate the screw S in the loosening direction. When the screw S is loosened, the restraining force for positioning from the screw S is lost, and the tip of the driver bit 3 moves freely in a direction perpendicular to the axis line, which may cause a core runout.

  However, the screw detaching device 1 has the intermediate portion position restricting portion 13 and the tip portion position restricting portion 14, and the position restricting portions 13 and 14 make the intermediate portion 3 </ b> A and the tip portion 3 </ b> B of the driver bit 3. The movement in the direction perpendicular to the axis of the driver bit 3 is restricted.

  That is, the intermediate portion 3A of the driver bit 3 is restricted from moving in the direction perpendicular to the axis of the driver bit 3 by being in contact with and supported by the inner cylindrical portion 17A of the bearing 17, and the driver bit 3 The tip portion 3B of the screw is moved in a direction perpendicular to the axis of the driver bit 3 by being in contact with and supported by the inner surface of the center hole of the ring member piece 20A fitted in the opening Ha of the screw insertion hole H. To be restricted.

  Accordingly, since the driver bit 3 is steady at the two positions of the intermediate portion 3A and the tip portion 3B, even if the length of the driver bit 3 is long, it is possible to sufficiently prevent the core runout. As a result, the screw S can be quickly rotated in the direction of further loosening.

Further, in this embodiment, the intermediate portion position restricting portion 13 is supported by the support base 11 that supports the rotation driving portion 10, and the intermediate portion of the driver bit 3 that is supported by the bearing support member 16. It is the structure provided with the bearing 17 which supports 3A rotatably. Since the support base 11 that supports the rotation drive unit 10 has high rigidity per se, the bearing 17 is supported by a strong force as a result. For this reason, the runout of the intermediate portion 3A of the driver bit 3 can be suitably suppressed.
Further, by appropriately changing the length of the rod 15 that extends from the support base 11 and supports the bearing support member 16, the support position of the intermediate portion 3A of the driver bit supported by the bearing 17 can be arbitrarily changed.

Further, the ring member 20 is divided from the distal end along the proximal end, and one of the divided ring member pieces 20A is fitted into the opening Ha of the insertion hole H of the screw S, The fitted ring member piece 20A guides the tip 3B of the driver bit 3 to be rotatable.
Thus, since the portion that rotatably guides the tip 3B of the driver bit 3 is limited to one of the ring member pieces 20A, when the driver bit 3 is rotated, the driver bit 3 and the ring member piece 20A The sliding resistance generated between the two can be reduced.

  In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

5 and 6, the outer peripheral surface is inclined at a uniform angle with respect to the end surface, but the ring member is not limited to this, as shown in FIG. Each ring member piece 30A has an outer peripheral surface orthogonal to the end face, and the ring member 30 constituted by these ring member pieces 30A has a diameter that gradually increases from the front end to the base end over the entire outer peripheral face. It may be in the shape of
Further, the ring member does not necessarily need to be divided into a plurality from the distal end to the proximal end, and may be formed in a truncated cone shape with an outer diameter.

DESCRIPTION OF SYMBOLS 1 ... Screw removal apparatus, 2 ... Screw removal part, 3 ... Driver bit, 3A ... Middle part of driver bit, 3B ... Tip part of driver bit, 10 ... Rotation drive part, 11 ... Support base, 12 ... Engagement protrusion , 13: Intermediate position restricting part, 14 ... Tip position restricting part, 15 ... Rod, 16 ... Bearing support member, 17 ... Bearing, 20, 30 ... Ring member, 20A, 30A ... Ring member piece, 21 ... Central hole , 22 ... retaining ring, E ... electrical appliance, S ... screw, Sa ... engagement groove, H ... screw insertion hole, Ha ... opening of screw insertion hole.

Claims (5)

When the base end of the screw is removed by a driver bit assembled to the rotational drive unit, the driver bit is prevented from running out of the core when the screw is detached.
An intermediate position restricting portion that contacts an intermediate portion between a base end and a distal end of the driver bit and restricts movement of the intermediate portion in a direction orthogonal to the axis of the driver bit, and a distal end portion of the driver bit. A driver bit center run prevention structure comprising: a tip portion position restricting portion that contacts and restricts the tip portion from moving in a direction perpendicular to the axis of the driver bit. The tip position restricting portion includes a ring member that is fitted on the outer periphery of the tip of the driver bit so as to be rotatable and movable in the axial direction of the driver bit.
The ring member is configured such that the ring member is fitted into an opening of a screw insertion hole into which the screw is inserted, and the tip of the driver bit is restricted from moving in a direction perpendicular to the axis. The structure for preventing runout of a driver bit according to claim 1.   3. The driver bit center runout prevention structure according to claim 2, wherein the outer periphery of the ring member is formed in a tapered shape whose outer diameter gradually increases from the tip toward the base.   4. The driver bit core runout prevention structure according to claim 2, wherein the ring member is divided into a plurality of parts from a distal end to a proximal end. 5.   The intermediate position restricting portion includes a bearing support member supported by a support base that supports the rotation drive portion, and a bearing that is supported by the bearing support member and rotatably supports the intermediate portion of the driver bit. 5. The driver bit center run prevention structure according to any one of claims 1 to 4, further comprising:

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