JP5265961B2 - Blade attachment / detachment assist device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade attaching and detaching auxiliary device enabling the efficient replacement of the nut holding section. <P>SOLUTION: The nut holding section is movable between a fixed position, a mounting position, and an attaching/detaching position. When claws 51 which form the nut holding section 50 are replaced, for example, merely the lock mechanism 70 is removed, and the nut holding section 50 is moved to the attaching/detaching position where the blade attaching and detaching auxiliary device can be attached/detached. Consequently, the nut holding section 50 can be replaced without completely disassembling the blade attaching and detaching auxiliary device. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a blade attaching / detaching auxiliary device for a cutting device for cutting a workpiece such as a semiconductor wafer with a blade.

  A cutting device such as a dicing machine generally includes a chuck table that holds a workpiece such as a semiconductor wafer, and a cutting unit on which a blade for cutting is mounted. The workpiece is cut by moving the two relative to each other while cutting into the workpiece. The blade used for such cutting needs to be replaced as appropriate depending on its wear and damage, or the type of workpiece and the details of processing. Here, when replacing the blade, a nut for fixing the blade to the spindle is generally fastened or loosened. In order to perform the removal of the nut at the time of such blade replacement, a blade removal assisting device having a nut gripping portion is used (for example, see Patent Documents 1 and 2). By using such a blade attachment / detachment assisting device when replacing the blade, the nut can be attached / detached efficiently.

JP 2005-191096 A JP 2004-281700 A

  However, the nut gripping portion provided in the blade attachment / detachment assisting device is formed of a material such as resin that is softer than the nut so as not to damage the nut that requires component balance because it rotates at high speed. For this reason, since the nut gripping portion deteriorates with time, it is necessary to periodically replace the nut gripping portion, and improvement in workability at the time of replacement is required.

  This invention is made | formed in view of the above, Comprising: It aims at providing the blade removal | desorption auxiliary | assistance apparatus which can perform replacement | exchange of a nut holding | grip part efficiently.

In order to solve the above-described problems and achieve the object, a blade attachment / detachment assisting device according to the present invention includes a rotatable spindle, a blade attached to the spindle, and a nut for fixing the blade to the spindle. A blade attachment / detachment assisting device for a cutting device, which engages with an engaged portion formed on a surface portion of the nut in a state where rotation of the spindle is restricted, and rotates the nut A nut rotating portion , and a nut gripping portion that is disposed in the nut rotating portion and grips an outer peripheral portion of the nut when the nut rotating portion is rotated by at least the nut rotating portion. a nut rotating portion and a fixed position capable of maintaining engagement with the nut, and removable mounting position the nut gripping portion for the outer peripheral portion of the nut, the brake And removable position detachable the nut grasping unit relative desorption assist device, and wherein the at least moveable between a.

  Moreover, the blade attachment / detachment assisting device according to the present invention is characterized in that, in the above invention, the nut gripping portion includes a plurality of claws that are independently distributed so as to grip the outer peripheral portion of the nut.

  The blade attachment / detachment assisting device according to the present invention further includes a housing portion surrounding the nut rotating portion and the nut gripping portion in the above invention, and the nut gripping portion is located relative to the housing portion at the attachment / detachment position. The spindle shaft is supported so as to be rotatable about a rotation axis, and the claw is supported so that the housing portion cannot be rotated about the spindle shaft as a rotation axis at the fixed position and the mounting position. The nut gripping part can be attached / detached one by one by rotating the nut gripping part with respect to the housing part and positioning it at a predetermined attaching / detaching position.

  The blade attachment / detachment assisting device according to the present invention is such that when replacing the nut gripping portion, the nut gripping portion may be moved to the attachment / detachment position, and the nut gripping portion can be replaced without completely disassembling the blade attachment / detachment assisting device. Thus, the nut gripping portion can be exchanged efficiently.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS A blade attachment / detachment assistance device that is the best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is an external perspective view showing a configuration example of a blade attachment / detachment assistance device according to an embodiment of the present invention and a cutting unit in a cutting device using the blade attachment / detachment assistance device, and FIG. FIG. 3 is a longitudinal sectional side view showing a configuration example of the vicinity of the blade of the cutting unit. The blade attachment / detachment assisting device 100 according to the present embodiment is used for attaching / detaching a nut 23 for fixing the blade 21 to the spindle 22 when replacing the blade 21 in the cutting unit 20 provided in the cutting device.

  Here, prior to the description of the blade attachment / detachment assisting device 100 of the present embodiment, a schematic configuration of the cutting unit 20 will be described. A cutting apparatus (not shown) having an overall configuration includes a cutting unit 20 having a blade 21 for cutting a workpiece such as a semiconductor wafer held on a chuck table by high-speed rotation. The cutting unit 20 includes, for example, a blade 21, a spindle 22, a nut 23, a flange 24, a spindle housing 25, a cutting water supply nozzle 26, and a wheel cover 27.

  The blade 21 is a cutting grindstone with a hub 21 a formed in a ring shape, and is mounted on the spindle 22 while being sandwiched from both sides by the hub 21 a and the flange 24. The spindle 22 is a rotating shaft for transmitting a rotational driving force from a driving source such as a motor to the blade 21 for high-speed rotation, and is supported in the spindle housing 25 so as to be capable of high-speed rotation via a bearing mechanism or the like. The spindle 22 can be restricted to a non-rotatable state by a lock mechanism (not shown). As this locking mechanism, for example, a locking mechanism as shown in Patent Documents 1 and 2 may be used. The cutting water supply nozzle 26 is detachably provided on the side of the blade 21, for example, and supplies cutting water to the vicinity of the processing shop and cools it when cutting. Further, the wheel cover 27 is provided so as to cover the outer periphery of the blade 21, and is for preventing scattering of cutting water and chips.

  The nut 23 is a flange nut fastened to the flange 24 in order to fix the blade 21 to the spindle 22. The nut 23 has a plurality of, for example, four engaging holes formed at substantially equal intervals as the engaged portions 23a on the surface portion (the surface that appears on the outside, ie, the operator side when attached to the cutting unit 20). ing.

  The cutting unit 20 having such a configuration streets the work surface of the work piece by rotating the blade 21 at a high speed by the rotational driving force of the spindle 22 and relatively moving the blade 21 while cutting the work piece into the work piece. Can be cut along.

  Here, with reference to FIG. 2 and FIG. 3, the aspect in which the blade 21 is mounted on the spindle 22 in the cutting unit 20 will be described. First, the spindle 22 has a small-diameter tip portion 22a for attaching the flange 24 and the like, and a female screw portion 22b into which the bolt 28 is screwed is formed at the tip portion 22a. Further, the flange 24 is formed with a flange male screw portion 24 a that is screwed with the female screw portion 23 b of the nut 23. The flange 24 is formed with a center hole 24b through which the tip 22a of the spindle 22 is inserted partway.

  Therefore, when the blade 21 is mounted on the spindle 22, the tip 22 a of the spindle 22 is inserted into the center hole 24 b of the flange 24. Thereafter, the flange 24 is prevented from being detached from the spindle 22 by screwing the male screw portion 28a of the bolt 28 into the female screw portion 22b of the spindle 22 and tightening. For example, a hexagonal engagement hole is formed as an engaged body 28b in the axial center of the bolt 28 attached to the axial center of the spindle 22.

  Next, the blade 21 is fitted to the flange 24 so that the blade 21 is sandwiched between the hub 21 a and the flange 24. Further, the blade 21 is clamped and fixed by the hub 21 a and the flange 24 by screwing and tightening the female screw portion 23 b of the nut 23 to the flange male screw portion 24 a of the flange 24.

  Therefore, when replacing the blade 21 mounted on the spindle 22, it is necessary to loosen the nut 23 and remove it from the flange 24 to replace the blade 21, and then screw the nut 23 onto the flange 24 again and tighten it. is there. The blade attachment / detachment assisting device 100 according to the present embodiment is used for fastening or loosening the nut 23 associated with such blade replacement. Therefore, the configuration of the blade attachment / detachment assisting device 100 will be described with reference to FIGS. FIG. 4 is an exploded perspective view showing a configuration example of the blade attachment / detachment assisting device 100 of the present embodiment, FIG. 5 is an exploded perspective view showing a part thereof assembled, and FIG. 6 is an assembled state. FIG. 7 is a vertical side view when the lock mechanism is in the open position, and FIG. 7 is a vertical side view when the lock mechanism is in the restriction position.

  The blade attachment / detachment assisting device 100 of the present embodiment is basically of a size that can be grasped with one hand, and includes a nut rotating portion 30, a nut grasping portion 50, a housing portion 60, and a lock mechanism 70.

  The nut rotating portion 30 is a member that is made of a material such as stainless steel and rotates the engaged nut 23. The nut rotating portion 30 is formed in a substantially cylindrical shape, and four engaging pins 31 are embedded on the surface side facing the nut 23 when in use. These engagement pins 31 are detachably engaged with the engaged portion 23a on the nut 23 side, and have a size and shape corresponding to the size, shape and arrangement of the engaged portion 23a (for example, approximately Columnar shape) and arrangement. Here, these engagement pins 31 are provided so as to be able to advance and retract while being urged outward (engagement direction) by a built-in compression spring 32 (see FIG. 6 and the like). Further, an alignment engagement body 33 that is detachably engaged with an engaged body 28b of the bolt 28 is provided at the center of the surface of the nut rotating portion 30 having the engagement pin 31. The alignment engagement body 33 protrudes outward from the engagement pin 31 and is formed in a size and shape (for example, hexagonal shape) corresponding to the size and shape of the engaged body 28b. The alignment engagement body 33 is provided so as to be able to advance and retract while being urged outward (engagement direction) by a built-in compression spring 34 (see FIG. 6 and the like).

  A plurality of, for example, eight mounting recesses 35 for mounting a nut gripping portion 40 to be described later within a substantially same diameter are provided on the outer peripheral edge of the nut rotating portion 30 on the surface side having the engaging pin 31 in the circumferential direction. Are dispersed at equal intervals. Further, an annular groove 36 is formed on the outer peripheral surface of the nut rotating portion 30 to connect a predetermined position of the surface portion of the mounting recess 35 in the circumferential direction.

  Further, a guide groove 37 parallel to the axial direction of the spindle 22 is formed at a predetermined length on a predetermined position on the outer peripheral surface of the nut rotating portion 30. The guide groove 37 allows the nut rotating portion 30 to move in the axial direction of the spindle shaft relative to the housing portion 60 to be described later, and disables rotation (fixed in the rotating direction) about the spindle shaft as the rotating shaft. Is for. An annular groove 38 that is orthogonal to the axial direction of the spindle 22 is formed over the entire circumference at a position that is continuous with one end of the guide groove 37 on the outer peripheral surface of the nut rotating portion 30. The annular groove 38 allows the nut rotating portion 30 to be unable to move in the axial direction of the spindle shaft (fixed in the axial direction) relative to the housing portion 60 to be described later, and to allow rotation with the spindle shaft as the rotating shaft. Is for.

  Further, a recess 39 is formed at a position on the opposite axial center of the nut rotating portion 30 that does not have the engaging pin 31. A wrench engaging body 40 having a wrench engaging portion 40a with which a wrench described later is engaged is embedded in the recess 39 so as to be fixed in the rotational direction.

  The nut gripping portion 50 is a member that is formed of a softer material than the material of the nut 23, for example, a synthetic resin such as plastic, and grips the outer peripheral portion of the nut 23. The nut gripping portion 50 of the present embodiment is based on a plurality of, for example, eight independent claws 51 that are evenly distributed in the mounting recesses 35 of the nut rotating portion 30 and grip the outer periphery of the nut 23 individually. It is configured. Each claw 51 is formed in a substantially L-shaped hook shape so as to be easily locked to the convex portion 23c (see FIG. 3 and the like) on the outer peripheral surface of the nut 23, and the fulcrum portion 52 is connected to the nut rotating portion 30. By being supported by the annular groove 36, it is mounted in the mounting recess 35 so as to be rotatable and displaceable in a direction in which the outer diameter of the nut 23 is increased. Here, the annular groove 36 is set so that the tip portion of the attached claw 51 protrudes from the end surface of the nut rotating portion 30 as shown in FIG. Further, the individual claws 51 are urged in the diameter increasing direction by a compression spring 53 embedded in the mounting recess 35.

  The housing part 60 is a member for housing the nut rotating part 30 and the nut gripping part 50 and surrounding the outer peripheral surface, and is formed in a substantially cylindrical shape by a material such as aluminum. Here, the housing portion 60 is located on the nut gripping portion 50 side and has an inner diameter portion 61 that is substantially the same as the outer diameter of the nut rotating portion 30, and is located on the concave portion 39 side and has a larger diameter than the inner diameter portion 61. A step structure having a portion 62 is formed. The outer peripheral surface corresponding to the large-diameter inner diameter part 62 of the housing part 60 is a large-diameter operation gripping part 63.

  Further, a movement restricting pin 64 is provided at a predetermined position on the outer peripheral surface of the housing part 60 so as to protrude to the inner peripheral surface side. The movement restricting pin 64 is positioned so that the tip protruding portion engages with the guide groove 37 or the annular groove 38. Thereby, within the range in which the movement restricting pin 64 engages with the guide groove 37, the nut rotating part 30 and the nut gripping part 50 can move relative to the housing part 60 only in the axial direction of the spindle shaft. As long as the movement restricting pin 64 is engaged with the annular groove 38, the nut rotating portion 30 and the nut gripping portion 50 can only rotate about the spindle axis relative to the housing portion 60. The relative movement between the two is restricted. In addition, a part of one end of the housing part 60 on the side opposite to the operation gripping part 63 is formed with a detachable part 65 that is a detachable part where the claw 51 is detachably attached. The detachable portion 65 is formed to be larger than each mounting recess 35. Further, it is formed with a width equal to or greater than the length of the fulcrum part 52.

  The lock mechanism 70 includes a pressing portion 71 and a connecting plate 72. The connecting plate 72 is a disc-shaped member formed of a material such as aluminum and having a size corresponding to the large-diameter inner diameter portion 62 of the housing portion 60, and is for attaching the pressing portion 71 to the nut rotating portion 30. The connecting plate 72 is removably attached to the nut rotating portion 30 by screwing the fixing screw 73 with the end surface of the nut rotating portion 30 on the concave portion 39 side through the screw hole 74. A plurality of spring holding portions 75 and 66 are formed at corresponding positions of the connecting plate 72 and the housing portion 60, and a compression spring 76 is disposed between the spring holding portions 75 and 66. Accordingly, in a normal state, the connecting plate 72 is set to be positioned at the opening portion of the large-diameter inner diameter portion 62 of the housing portion 70 by the biasing force of the compression spring 76.

  On the other hand, the pressing portion 71 is substantially the same diameter as the connecting plate 72 and is formed in a hemispherical shape, and is attached to the surface of the connecting plate 72 by a fixing screw 73 so as to protrude outside the housing portion 60. . Here, by having a long hole 77 that is elongated in a direction perpendicular to the spindle axis at a position corresponding to the screw hole 74, the pressing portion 71 is connected to the connecting plate 72 (and hence the nut rotating portion 30) with respect to the spindle shaft. Is provided so as to be slidable by a predetermined amount in a direction orthogonal to. The pressing portion 71 is formed with a wrench insertion hole 78 for inserting a wrench. The wrench insertion hole 78 is formed at a position eccentric with respect to the center of the pressing portion 71 itself. When the pressing portion 71 is slid, the wrench insertion hole 78 comes on the spindle shaft and is inserted through the wrench insertion hole 78. It is set so that engagement with the wrench engaging portion 40a is allowed. The wrench insertion hole 79 on the connection plate 72 side is formed as a long hole corresponding to the long hole 77 in consideration of the sliding movement of the pressing portion 71.

  Furthermore, the pressing portion 71 has a mounting portion 80 for mounting on a mounting surface such as a work table with the hemispherical tip portion chamfered so as to be flat, with the pressing portion 71 side as a lower side. Is formed.

  Here, the positional relationship of each part will be described. First, in a state where the pressing portion 71 of the lock mechanism 70 is positioned on the axial center without sliding, the nut gripping portion 30 is at least movable between the attachment position and the fixed position. In a state where the pressing portion 71 of the lock mechanism 70 is not slid and positioned on the axis, the nut gripping portion 30 is entirely covered by the housing portion 60 and the claw 51 does not move as shown in FIG. The nut 23 can be gripped at the outer peripheral portion, and can be positioned at a fixed position where the engagement between the nut rotating portion 30 and the nut 23 can be maintained. Alternatively, as shown in FIG. 6B, the nut gripping portion 30 is moved from the housing portion 60 to the claw 51 by relatively moving the pressing portion 71 (nut rotating portion 30) and the housing portion 60 in the axial direction. It can be positioned at a mounting position where a part protrudes and can be attached to and detached from the outer periphery of the nut 23. The claw 51 that is positioned at the mounting position and partially protrudes from the housing part 60 can be displaced in the diameter increasing direction within a range that can be attached to and detached from the outer peripheral part of the nut 23, and cannot be removed from the nut gripping part 30. is there. The stroke between the fixed position and the mounting position is regulated by the pushable amount of the connecting plate 72 portion with respect to the large-diameter inner diameter portion 62. Further, the nut gripping portion 50 is normally biased by the biasing force of the compression spring 76 so as to be able to take the fixed position side. The normal state as shown in FIG. 6 in which the lock mechanism 70 can move between the fixing position and the mounting position of the nut gripping portion 50 is set as the open position.

  On the other hand, in a state where the pressing portion 71 of the lock mechanism 70 is slid and eccentric with respect to the spindle axis, the axial direction between the pressing portion 71 (nut rotating portion 30) and the housing portion 60 is shown in FIG. Cannot be moved relative to each other. In other words, the lock mechanism 70 is positioned at the restriction position where the nut gripping portion 50 cannot move from the fixed position. Further, when the lock mechanism 70 is positioned at the restriction position, as shown in FIG. 7, the wrench insertion hole 78 is positioned on the spindle shaft, and the wrench engagement with the wrench engagement portion 40a is allowed.

  Next, a blade attaching / detaching method using such a blade attaching / detaching auxiliary device 100 will be described with reference to FIGS. First, prior to removal of the blade 21 attached to the cutting unit 20, a locking mechanism (not shown) is applied to the cutting unit 20 so that the rotation of the spindle 22 is restricted. Then, as shown in FIG. 6A, the blade attachment / detachment assisting device 100 in which the lock mechanism 70 is positioned in the open position and the nut gripping portion 50 is in the fixed position, as shown in FIG. Move closer to the nut 23.

  Further, as shown in FIG. 9, the nut 23 is held by bringing the tip end side of the blade attachment / detachment assisting device 100 close to the nut 23 so as to be joined. At this time, center alignment is performed by engaging the alignment engagement body 33 protruding outward from the engagement pin 31 with the engaged body 28b on the cutting unit 20 side. Further, as shown in FIG. 9, by pressing the pressing portion 71 with the palm while holding the operation gripping portion 63 of the housing portion 60 with a fingertip, the housing portion 60, the nut rotating portion 30, and the nut against the compression spring 76. The grip portion 50 is moved relatively in the axial direction, and the nut grip portion 50 is moved from the fixed position to the mounting position as shown in FIG. Thereby, each nail | claw 51 of the nut holding | grip part 50 can be displaced to an enlarged diameter direction centering | focusing on the fulcrum part 52, and can be attached or detached with respect to the outer peripheral part of the nut 23. FIG.

  Therefore, the blade attachment / detachment assisting device 100 is further moved to the nut 23 side in a state where the center position alignment between the blade attachment / detachment assisting device 100 and the spindle shaft is performed, and the engagement pin 31 of the nut rotating portion 30 is connected to the nut 23. The rotation is adjusted to engage with the engaged portion 23a. By moving the blade attachment / detachment assisting device 100 further toward the nut 23 at a position where the engagement pin 31 engages with the engaged portion 23a, the engagement state between the engagement pin 31 and the engaged portion 23a is established. At the same time, each claw 51 of the nut gripping portion 50 gets over the convex portion 23c on the outer peripheral surface of the nut 23, so that the outer peripheral portion is gripped.

  In this operation, the blade attachment / detachment assisting device 100 has the alignment engagement body 33 on the axis, and the center alignment is performed by engaging the engagement engagement body 33 with the alignment engagement body 33 as a mark. It becomes easy to attach the nut gripping part 50 to the nut 23. In particular, since the engagement between the alignment engagement body 33 and the engaged body 28b has a function of guiding the movement operation in the axial direction, the tip end side of the blade attachment / detachment assistance device 100 is not inclined with respect to the nut 23. In the detaching operation, the soft nut gripping portion 50 is not rubbed or damaged by the nut 23. Further, in this center alignment, the alignment engagement body 33 is urged in the advance direction by the compression spring 34 and can advance and retreat, so that it absorbs a dimensional error in the advance direction in the engagement with the engaged body 28b. Can do.

  Further, when the nut gripping part 50 is moved from the fixed position to the mounting position, the substantially hemispherical pressing part 71 protruding outside the housing part 60 may be pressed with the palm, and the nut rotating part 30 is directly pressed with the thumb. Compared with the case of operation, force is easily applied and operability is improved. In addition, since the operation gripping portion 63 of the housing portion 60 can be firmly gripped with five fingertips, the operability when the nut gripping portion 50 is moved from the fixed position to the mounting position is also improved in this respect. Furthermore, since the engagement pin 31 is urged in the advance direction by the compression spring 32 and can advance and retreat, the workability of rotating and engaging the blade attachment / detachment assisting device 100 to the engaged portion 23a is improved. improves.

  Thus, when the engaging pin 31 engages with the engaged portion 23a and each claw 51 grips the outer peripheral portion of the nut 23, the pressing against the pressing portion 71 is released. As a result, as shown in FIG. 10, the housing part 60 returns to the original state by the urging force of the compression spring 76, and covers the nut gripping part 50 as a whole so that the nut gripping part 50 is also fixed to the original state. Return to the state. As a result, each claw 51 cannot be displaced in the diameter-enlarging direction around the fulcrum portion 52, and is fixed in a state of gripping the outer peripheral portion of the nut 23, and the engagement between the engagement pin 31 and the engaged portion 23a. Maintain a consistent state. Therefore, the operator grips the operation gripping portion 63 of the housing portion 60 with one hand and rotates it in a direction to remove the nut 23. At this time, since the nut rotating part 30 and the nut gripping part 50 are fixed in the rotational direction with respect to the housing part 60, the nut rotating part 30 and the nut gripping part 50 also rotate together. That is, the nut 23 can be rotated in the direction of removing the engagement pin 31 and the engaged portion 23a.

  In this operation, the nut gripping portion 50 is urged to the fixed position side by the compression spring 76, so that the nut 23 can be moved to the fixed position where the nut 23 is gripped only by releasing the hand. Further, since the pressing portion 71 that is pressed when the nut 23 is gripped is formed in a substantially hemispherical shape, when the nut 23 is rotated in the direction of removing the nut 23, it is possible to rotate with the pressing portion 71 portion. It is extremely difficult and can be guided to rotate by holding the operation gripping portion 63 of the housing portion 60. The operation gripping portion 63 has a large diameter and can be easily rotated.

  Then, the nut 23 is removed from the flange 24 as shown in FIG. 11 by rotating in the direction in which the nut 23 is removed while the engagement pin 31 and the engaged portion 23a are engaged. In this state, the nut gripping portion 50 is maintained in a fixed state by the urging force of the compression spring 76. Thereby, each nail | claw 51 is fixed to the state which grips the outer peripheral part of the nut 23, and maintains the engagement state of the engaging pin 31 and the to-be-engaged part 23a. Therefore, the nut 23 removed from the flange 24 is not dropped.

  Furthermore, as shown in FIG. 12, the blade attachment / detachment assisting device 100 holding the removed nut 23 is once placed on a placement surface such as a work table. This is because, for example, when working alone, the blade 21 needs to be replaced as described later, and it is necessary to release the hand from the blade attachment / detachment assistance device 100. At this time, since the hemispherical pressing portion 71 has a flat mounting portion 80 formed by chamfering, the mounting portion 80 is placed on the mounting surface so that the nut 23 is placed on the upper side. The nut 23 can be prevented from being damaged.

  On the other hand, on the cutting unit 20 side, the blade 21 with the hub 21a to be replaced is removed as shown in FIG. 13 (a), and the new hub 21a is attached as shown in FIG. 13 (b). The blade 21 is mounted. After the blade 21 is mounted, the nut 23 is attached to the flange 24 using the blade attachment / detachment assisting device 100 that holds the nut 23 as shown in FIG. This procedure is the reverse of the removal procedure, and is performed by holding the operation gripping portion 63 of the housing portion 60 by hand and rotating the nut 23 in the tightening direction.

  Further, as shown in FIG. 15, the lock mechanism 70 is positioned at the restriction position by sliding the pressing portion 71 in a direction orthogonal to the axial direction. Then, the torque wrench 90 is inserted through the wrench insertion holes 78 and 79 and engaged with the wrench engaging portion 40a in the nut rotating portion 30, and is rotated in a direction to tighten the nut 23 with a specified torque. Thereby, the nut 23 can be fastened to the flange 24 with a prescribed torque.

  At this time, since the nut gripping portion 50 is restricted so as not to move from the fixed position, the blade attaching / detaching auxiliary device 100 does not come off from the cutting unit 20 side when the torque wrench 90 is turned, and the work can be performed stably. It can be performed. That is, the force by the torque wrench 90 is easily transmitted, and the claw 51 is not worn by wear due to misalignment.

  When the fastening of the nut 23 by the torque wrench 90 is completed, first, the torque wrench 90 is pulled out from the blade attachment / detachment assisting device 100 as shown in FIG. This is because the lock mechanism 70 cannot be positioned in the open position unless the torque wrench 90 is pulled out. That is, unless the lock mechanism 70 is in the open position, the nut gripping portion 50 remains gripping the outer peripheral portion of the nut 23, and the blade attachment / detachment assisting device 100 cannot be removed from the nut 23.

  Then, as shown in FIG. 16, the locking mechanism 70 is positioned from the restricted position to the open position by sliding the pressing portion 71 to the original position. Further, as shown in FIG. 17, as in the case of going to grip the nut 23, the housing portion 60 is pressed by pressing the pressing portion 71 in the axial direction with the palm while holding the operation gripping portion 63 with the fingertip. The nut grip 50 is moved to the mounting position by relative movement in the axial direction. Thereby, each nail | claw 51 of the nut holding | grip part 50 can be displaced to a diameter-expanding direction centering on the fulcrum part 52, and the nut holding | grip part 50 moves the nut 23 by moving the holding | grip housing part 60 as it is in the extraction direction. Detach from the outer periphery of That is, the blade attachment / detachment assistance device 100 is removed from the nut 23.

  Thus, in the present embodiment, when the lock mechanism 70 is positioned at the restricting position, the lock mechanism 70 allows the torque wrench 90 to be engaged with the wrench engaging portion 40a and is positioned at the open position. Makes the engagement of the torque wrench 90 with the wrench engaging portion 40a impossible. Therefore, after the blade replacement, as shown in FIG. 17, the blade attachment / detachment assisting device 100 and the torque wrench 90 are always separated. If the blade attachment / detachment assistance device and the torque wrench are integrated after the blade replacement, the other torque wrench or blade attachment / detachment assistance device is not prepared by having only one blade attachment / detachment assistance device or torque wrench. However, according to the present embodiment, this can be avoided. Further, in the blade attachment / detachment assisting device 100, since the nut gripping portion 50 is biased to the fixed position side by the compression spring 76, the nut gripping portion 50 is entirely covered by the housing portion 60 in a single state, and the surface Therefore, the nut gripping portion 50 is not damaged.

  11, 12, and 14 show the state where the lock mechanism 70 is positioned at the open position, but the lock mechanism 70 may be positioned at the restriction position. By setting the lock mechanism 70 to the restricted position, the nut gripping portion 50 is maintained in a state where the movement from the fixed position is impossible. According to this state, each nail | claw 51 of the nut holding | grip part 50 is maintained in the state covered with the housing part 60 entirely, and can protect the nut holding | grip part 50 from damage. In addition, it is possible to prevent the gripped nut 23 from falling by moving the lock mechanism 70 to the restricting position and applying the lock while the nut 23 is gripped.

  By the way, in the blade attachment / detachment assisting device 100, when the nut gripping portion 50 deteriorates, it is necessary to replace it with a new nut gripping portion 50. The nut gripping portion 50 of the blade attachment / detachment assisting device 100 of the present embodiment is provided so as to be movable to the attachment / detachment position for attachment / detachment replacement from the blade attachment / detachment assistance device 100 in addition to the above-described fixing position and attachment position. . Here, as shown in FIG. 18, the nut gripping portion 50 can be moved to the attaching / detaching position by removing the lock mechanism 70 from the blade attaching / detaching auxiliary device 100. That is, by removing the lock mechanism 70 from the blade attachment / detachment assisting device 100 and pushing the back side of the nut rotating portion 30 into the housing portion 60 until the movement restricting pin 64 engages with the annular groove 38, the nut gripping portion 50. Is positioned at the desorption position. At this detaching position, most of the nut gripping portion 50 up to the vicinity of the fulcrum portion 52 is exposed to the outside of the housing portion 60, and can be rotated together with the nut rotating portion 30 around the spindle shaft as a rotating shaft.

  Therefore, when attaching / detaching the claws 51, the nut gripping portion 50 is positioned at the attaching / detaching position, and then, as shown in FIG. . The entire claw 51 positioned in the detachable portion 65 is exposed from the housing portion 60, and the fulcrum portion 52 can be removed from the annular groove 36. Therefore, the detachable replacement of the claw 51 can be performed one by one.

  As described above, according to the present embodiment, when removing and replacing the nut gripping portion 50, it is not necessary to disassemble the entire blade attachment / detachment assisting device 100, and it is only necessary to remove the lock mechanism 70 from the blade attachment / detachment assisting device 100. Work can be done. In addition, if a configuration in which a plurality of claws must be attached and detached at once is used, parts are often separated. In this embodiment, the claws 51 are exchanged one by one at the attachment / detachment portion 65. Therefore, the replacement work can be performed with good workability without the nails 51 being separated.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, although the blade 21 of the present embodiment is a blade with a hub 21a, it may be a so-called washer blade having only a ring-shaped cutting edge portion and sandwiching both sides with flanges. Further, a type in which the blade 21 with the hub 21a is directly attached to the spindle 22 with a nut without using the flange 24 may be used.

  Further, in the present embodiment, the application example to the bolt type cutting unit 20 in which the flange 24 and the like are mounted on the spindle 22 using the bolt 28 has been described. However, the nut and the blade or flange mounted on the spindle using the nut. The same applies to a cutting unit of the type. In this case, the engaged body with which the alignment engagement body 33 engages may be directly formed at the tip of the spindle 22.

  Moreover, in this Embodiment, although the nut holding part 50 was comprised by the some nail | claw 51, as a structure of the nut holding part 50, not only a nail | claw structure but the thing which can hold the outer peripheral part of the nut 23 so that engagement / disengagement is possible. If it is. Furthermore, in the present embodiment, the mounting portion for mounting the fulcrum portion 52 that rotatably supports the claw 51 is configured by the annular groove 36, but it is not necessary to be continuous as the annular groove 36. The fulcrum part 52 may be individually formed in a size that allows the fulcrum part 52 to be attached thereto.

  Further, in the present embodiment, the flat mounting portion 80 is formed by chamfering the hemispherical pressing portion 71, but the pressing portion 71 side is the lower side, and the mounting portion 80 is stably mounted on the mounting surface. For example, a circular recess may be formed around the center of the pressing portion 71 to form an annular mounting portion, or a plurality of locations around the center of the pressing portion 71 may be used. A mounting portion may be formed by forming a protrusion to be grounded on the mounting surface.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external appearance perspective view which shows the structural example of the cutting unit in the blade removal auxiliary | assistance apparatus of embodiment of this invention, and the cutting device using this blade removal | desorption auxiliary | assistance apparatus. It is a disassembled perspective view of the blade vicinity of a cutting unit. It is a vertical side view which shows the structural example of the braid | blade vicinity of the cutting unit. It is a disassembled perspective view which shows the structural example of the braid | blade removal | desorption assistance apparatus of this Embodiment. It is a disassembled perspective view shown in the state which assembled a part of braid | blade removal | desorption assistance apparatus. It is a vertical side view when it is an assembly state and a lock mechanism exists in an open position. It is a vertical side view in case a lock mechanism exists in a control position. It is a vertical side view which shows the mode at the time of the start of a braid | blade removal | desorption operation | work. It is a vertical side view which shows the mode at the time of nut holding | grip start. It is a vertical side view which shows a mode at the time of rotating to the direction which removes a nut. It is a vertical side view which shows the mode at the time of nut removal. It is a vertical side view which shows a mode when it once puts on a work table. It is a vertical side view which shows the example of detachment | desorption operation of a braid | blade. It is a vertical side view which shows the mode at the time of nut attachment. It is a vertical side view which shows the mode at the time of fastening with a wrench. It is a vertical side view which shows the mode at the time of wrench removal. It is a vertical side view which shows the mode after work completion | finish. It is a vertical side view which shows the mode of a removal | desorption position. It is a front view which shows the mode of a removal | desorption position.

Explanation of symbols

21 Blade 22 Spindle 23 Nut 30 Nut rotating part 50 Nut gripping part 51 Claw 60 Housing part

Claims (3)

A blade attachment / detachment assisting device for a cutting device, comprising a rotatable spindle, a blade attached to the spindle, and a nut for fixing the blade to the spindle,
A nut rotating part for engaging the engaged part formed on the surface part of the nut in a state where the rotation of the spindle is restricted, and rotating the nut;
A nut gripping portions for gripping the outer peripheral portion of the nut when the disposed nut rotating portion, and rotating the nut by at least the nut rotating unit,
With
The nut grasping portion has a fixed position that can maintain the engagement with the said nut rotating part nut, and removable mounting position the nut gripping portion for the outer peripheral portion of the nut, the blade desorption aid The blade attachment / detachment assisting device is capable of moving at least between the attachment / detachment position where the nut gripping portion can be attached / detached.   2. The blade attachment / detachment assisting device according to claim 1, wherein the nut gripping portion includes a plurality of claws that are separately distributed so as to grip an outer peripheral portion of the nut. A housing portion surrounding the nut rotating portion and the nut gripping portion;
The nut gripping portion is rotatably supported by the housing portion with the spindle shaft as a rotation axis at the detachment position, and the spindle shaft is a rotation shaft with respect to the housing portion at the fixed position and the attachment position. Supported so that rotation is impossible,
The blade attachment / detachment assisting device according to claim 2, wherein the claws can be attached / detached one by one by rotating the nut gripping portion relative to the housing portion and positioning the claws at a predetermined attachment / detachment location.

Images