JP5489165B2 - Chip dresser - Google Patents

Description

  The present invention relates to a tip dresser that cuts and polishes a pair of electrode tips used for spot welding.

  Conventionally, as a tip dresser for polishing an electrode tip used for spot welding, a rotary drive unit driven by a motor directly supports a cutting blade (see, for example, Patent Document 1) or a cutting blade. There is one in which a separate cutter holder is rotatably supported (for example, see Patent Document 2 and FIG. 18).

JP 2008-73716 A JP 2007-90427 A

  The cutter that cuts and polishes the electrode tip needs to be detachable for maintenance and replacement. However, in the conventional tip dresser disclosed in the above-mentioned document, the cutter itself or the cutter holder is finally plural. Since the location is fixed by screwing, the attaching / detaching work is troublesome. This is because not only a separate tool is required, but the screw may be lost during the attaching / detaching operation. If a screw is lost, it is necessary to procure a new screw, which further reduces workability. Some of them continue to work with only a part of the screw without procuring the screw. In this case, the original function of the chip dresser may not be exhibited. In view of such a situation, there has been a demand for a chip dresser that can attach the cutter holder to the rotation drive unit without using screwing.

  In view of this, an object of the present invention is to provide a chip dresser that can attach and detach a cutter holder to and from a rotational drive unit without the need for a tool.

A tip dresser according to the present invention includes a rotary drive unit having a gear driven by a motor, a cutter for polishing a pair of electrode tips, and a cutter holder that is detachably attached and fixed to the axial center of the rotary drive unit. , Comprising:
A cutter holder is provided so as to project in a circumferential direction on a cylindrical main body, a flange projecting outward at an upper edge of the main body, and an outer peripheral surface of the main body below the flange. Similarly, the first protrusion and the first protrusion are provided so as to extend in the circumferential direction at positions substantially symmetrical with the first protrusion with respect to the axial center, and the length in the circumferential direction is larger than that of the first protrusion. With two protrusions,
Rotation drive part
An insertion hole arranged in the center and through which the cutter holder is inserted;
Communicating with the insertion hole, allowing the first protrusion to be received from above, making the second protrusion unacceptable, and allowing the first protrusion to be fitted along the first axial recess extending along the axial direction A first circumferential recess extending from the lower portion of the first axial recess to the opposite side of the rotational direction of the rotational drive unit in the circumferential direction;
A second axial recess extending in the axial direction so as to be able to receive the second projecting portion from above, and a lower projecting portion from the lower portion of the second axial recess so as to be capable of receiving the second projecting portion. A second circumferential recess extending in a direction opposite to the rotation direction of the rotation drive unit in
The upper surface of each circumferential recessed portion is configured, a first sandwiched portion formed so as to protrude toward the inner circumferential side relative to each circumferential recessed portion, and a second sandwiched portion,
With
The cutter holder is inserted into the insertion hole so that the first protrusion and the second protrusion are immersed in the corresponding axial recesses, and is rotated in the direction opposite to the rotation direction of the rotation drive unit to rotate each protrusion in each circumferential direction. The first projecting portion and the second projecting portion are formed at positions where the first sandwiched portion and the second sandwiched portion are sandwiched between the flange portion and the first sandwiched portion when being inserted into the recess. This is a featured chip holder.

  According to the above configuration, the cutter holder is attached and fixed to the rotation drive unit so that the first protrusion and the second protrusion are immersed in the first axial recess and the second axial recess, respectively. Is inserted into the insertion hole of the rotation drive unit along the axial direction, and then the cutter holder is turned in the direction opposite to the rotation direction of the rotation drive unit, so that the first protrusion and the second protrusion And the second circumferential recess respectively. In other words, since the cutter holder is configured to be attachable to the rotation drive portion by a so-called bayonet method, no screwing is required, and therefore the tool Since the cutter holder can be attached and fixed to the rotary drive unit without worrying about procuring a screw or losing a screw, workability can be improved. Also, when removing the cutter holder, it is only necessary to turn the cutter holder in the direction opposite to the direction of attachment and move each projection of the cutter holder to the respective axial recess that is the release position. Can be done.

  The first protrusion and the second protrusion of the cutter holder are formed with different lengths in the circumferential direction, while the first axial recess corresponding to the shorter first protrusion is Since the two projecting portions are formed so as not to be received, it can be reliably inserted into the rotational drive portion at the correct position. That is, as a comparative example, two protrusions arranged symmetrically with respect to the axis center and two axial recesses on the side of the rotational drive unit are formed with the same dimensions, and one protrusion is If it is formed so as to be immersible in the axial recess, it will not fit into the cutting hole discharge hole normally provided in the cutter holder if it is not inserted into the correct axial recess, and it will fit in a 180 ° inverted state. Will end up. In such a case, re-installation is required and workability is reduced. Therefore, compared with such a case, in the configuration of the present embodiment, the cutter holder can be surely inserted at the correct position with respect to the rotation drive unit.

  In addition, the rotational drive unit constitutes the upper surface of each circumferential recess, and is formed so as to protrude toward the inner peripheral side relative to each circumferential recess, and a second sandwiched portion, On the other hand, on the cutter holder side, the first projecting portion and the second projecting portion sandwich the respective sandwiched portions between the flange portion when the first projecting portion and the second projecting portion are fixed to the rotation driving portion on the outer peripheral surface of the main body portion. Is arranged. According to this configuration, when the cutter holder is rotated after being inserted into the insertion hole of the rotation drive unit, each protrusion is inserted into each circumferential recess, and the flange portion and each protrusion of the cutter holder allow the rotation drive unit side. The clamping part is clamped, the rotation drive part and the cutter holder are tightened to each other, there is no backlash in the axial direction, and the tightening is comparable to the case of fixing with conventional screws A fixed state is obtained.

  In the above-described chip dresser, the rotation driving unit includes an annular fitting receiving portion that is fixedly attached to a mounting seat provided along the inner periphery of the insertion hole through which the cutter holder is inserted by a plurality of screws. Forming a first notch portion and a second notch portion connected to the lower portion of each axial recess on the opposite side to the rotation direction of the rotation drive portion in the circumferential direction, It is desirable that the circumferential recessed portion is constituted by a space surrounded by the upper surface of the mounting seat and the inner peripheral surface of the first notch and the second notch. According to this, each axial recessed part which inserts each protrusion part of a cutter holder in an axial direction, and the 1st notch part and the 2nd notch part which constitute each circumferential direction recessed part to which each protrusion part is fitted, Because it is provided in a fitting receiving part that is separate from the rotary drive unit body equipped with gears, a bayonet mounting structure is possible compared to the case where these parts are processed so as to be provided integrally in the rotary drive unit body It is possible to reduce the man-hours and costs for manufacturing the rotary drive unit.

  In the above-mentioned chip dresser, a mark configured to be visually distinguishable from surrounding members is provided on the upper surface of the rotation driving unit, and the cutter holder is arranged so that each protruding portion coincides with each axial concave portion in the vertical direction. When doing so, it is desirable to form a mark visual hole penetrating in the axial direction at a position directly above the mark in the cutter holder. According to this configuration, when the cutter holder is inserted into the rotation drive unit, the cutter holder is placed at a position where the mark can be seen through the mark visual hole, even if the position of each protrusion is hidden from the flange and cannot be visually recognized from above. If arranged, each protrusion can be arranged at a position where it can be immersed in the corresponding axial recess, so that the cutter holder and the rotation drive part can be easily aligned, You do not have to search for the corresponding axial recess.

  In the case where the rotation driving unit includes a fitting receiving part provided with each axial recess and each notch, the mark used for alignment includes a plurality of mounting and fixing the fitting receiving part to the rotation driving unit main body. It is desirable to provide the head of the specific screw, for example, by coloring the head of the specific screw that is one of the screws. This is because it is easier to form the mark as compared with the case where the mark is formed on a portion such as the upper surface of the fitting receiving portion that is difficult to mark without variation for each product. When the axial recesses and the circumferential recesses are provided integrally on the rotary drive body itself provided with gears without using a separate fitting receiving part, the axial recesses and the circumferential recesses are integrally formed. In addition, a colored portion or a recessed portion may be partially provided on the upper surface of the rotation driving unit to serve as an alignment mark.

  Further, in the above-described chip dresser, the rotation driving unit is further provided with a ball plunger in which a ball is arranged so as to be able to appear and retract on the upper surface of the rotation driving unit, and on the cutter holder side, each protrusion is formed on the lower surface of the flange unit. If a concave portion is provided in which the ball plunger is fitted in the circumferential concave portion, the ball is fitted into the concave portion when fitting between the cutter holder and the rotary drive unit is completed, and a sense of moderation can be obtained. it can.

  According to the chip dresser according to the present invention, the cutter holder provided with the cutter can be attached to and detached from the rotation drive unit without using a tool.

It is the schematic of the chip dresser of embodiment. It is a disassembled perspective view of the cutter holder in the chip dresser of embodiment, the main-body part of a rotation drive part, and a fitting receiving part. It is a top view of the main-body part of FIG. It is a top view of the fitting receiving part of FIG. FIG. 5 is a longitudinal sectional view showing a state in which the fitting receiving portion is attached and fixed to the main body portion in the rotation driving portion of the embodiment, and corresponds to a position of line XX in FIG. 4. It is a top view of the cutter holder of FIG. It is a bottom view of the cutter holder of FIG. It is sectional drawing of the VV line part in FIG. It is a figure which shows the state at the time of inserting a cutter holder in the insertion hole of a rotation drive part. It is a longitudinal cross-sectional view which shows the fitting state of the cutter holder of FIG. 2, and a rotation drive part. It is sectional drawing in the horizontal direction which shows the attachment fixation to the rotation drive part of the cutter holder of FIG. 2 in order.

  An embodiment of the present invention will be described with reference to the drawings. A chip dresser (hereinafter, simply referred to as a “dresser”) M of the embodiment is disposed on the front end side of a bed portion 4 as shown in FIG. A pair of electrode tips T are received on both the upper and lower sides of the dresser body 1 to perform cutting and polishing.

  As shown in FIG. 2, the dresser body 1 is mounted with a rotation driving unit 10 driven by a motor and a cutter 5 for detachably mounting and fixing to the rotation driving unit 10 to polish the electrode tip T. A cutter holder (hereinafter sometimes simply referred to as a holder) 30. The dresser body 1 of the present embodiment is configured so that the cutter holder 30 can be attached to the rotation drive unit 10 by a so-called bayonet method, not by screwing.

  As shown in FIGS. 1 and 2, the rotary drive unit 10 is embedded in the tip side of the bed portion 4 of the chip dresser M, holds the cutter holder 30 rotatably, and is disposed below the base portion side of the bed portion 4. The driving force of the motor 50 to be transmitted is transmitted to the cutter holder 30. The rotation drive unit 10 in the present embodiment is configured to rotate clockwise around a rotation axis (see FIG. 11A), and includes a main body unit 11 that includes a gear 16 and is driven by a motor, A ball that is inserted into the main body 11 and the fitting receiving portion 20 in order to provide a feeling of moderation when the fitting receiving portion 20 that is fixed to the portion 11 with the screw 7 and the cutter holder 30 is fixed to the rotation driving portion 10. A plunger 9.

  As shown in FIGS. 2 and 3, the main body 11 includes a cylindrical portion 13 that is formed in a substantially cylindrical shape, and a gear 16 that protrudes in a disk shape on the outer peripheral surface of the cylindrical portion 13. The gear 16 meshes with a gear 53 disposed between the dresser body 1 and a gear 50a disposed on the drive shaft 50b of the motor (see FIG. 1), and through these gears 50a and 53, It is rotated by the driving force of the motor 50. As shown in FIGS. 2 to 3 and 5, the cylindrical portion 13 has a bearing 70 (see FIG. 5) that rotatably supports the rotation driving portion 10 on the outer peripheral surface, and a cutter holder on the inner peripheral side. A through-hole 17 penetrating in the axial direction is provided so as to allow insertion of 30. The cylindrical portion 13 is provided with a stepped portion 18 substantially in the middle in the vertical direction, with the thin-walled portion 13a at the upper end side and the thick-walled portion 14 formed with the lower end side thicker toward the inner peripheral side. For this reason, the through-hole 17 has an approximately half on the upper end side as a large diameter portion 17a and an approximately half on the lower end side as a small diameter portion 17b having a smaller diameter than the large diameter portion 17a. The thick-walled portion 14 on the lower end side of the cylindrical portion 13 is formed such that a partial region in the circumferential direction is cut out over the entire region in the up-and-down direction, and the waste discharging recess 15 communicating with the through hole 17 is formed. For this reason, the small-diameter portion 17b has a circular cross-sectional shape with a part bulged. The waste discharging recess 15 forms a cutting waste discharge port 36 (see FIG. 11B) together with a waste discharging recess 22a of the fitting receiving portion 20 described later and a notch portion 35 of the cutter holder. The upper surface of the stepped portion 18 functions as a mounting seat 19 for the fitting receiving portion 20, and a screw that penetrates the thick portion 14 in the axial direction from the upper surface of the stepped portion 18 to screw the fitting receiving portion 20. Holes 14a are formed at four substantially equal intervals around the axis. Between the two screw holes 14a formed on the side facing the recess 15 across the shaft center, a bottomed fitting hole 14b having a larger diameter than each screw hole 14a is formed. The ball plunger 9 described above is inserted into the fitting hole 14b so that the ball 9a is disposed at the upper end.

  As shown in FIGS. 2, 4, and 5, the fitting receiving portion 20 is an annular member screwed to the upper surface of the step portion 18 on the inner peripheral side of the cylindrical portion 13, that is, the mounting seat 19. Is substantially the same as the diameter of the large-diameter portion 17a of the through-hole 17, and an annular peripheral portion 24 having a flat upper surface and a small-diameter portion 17b of the through-hole 17 formed in the center of the peripheral portion 24. A through hole 22 having substantially the same diameter is provided. The through hole 22 constitutes the insertion hole 12 (see FIG. 5) into which the cutter holder 30 is inserted together with the through hole 17 of the main body 11.

  In the peripheral portion 24, screw holes 24a corresponding to the screw holes 14a formed in the thick portion 14 of the cylindrical portion 13 are formed at four locations around the axis so as to penetrate the top and bottom, and at these four locations, The mounting seat 19 is fixed by screws 7. When the head 8 of the specific screw 7A, which is one of the four screws 7, is mounted on the dresser M when viewed from above the bed portion 4, the remaining three screws 7b and the peripheral edge It functions as a mark 8 configured to be visually distinguishable from the surrounding members such as the upper surface of the portion 24, and in this embodiment, the metal color of the head of the other screw 7b and the upper surface of the peripheral portion 24 For example, it is colored yellow so that it can be distinguished. Further, a fitting hole 26 penetrating vertically is formed at a position corresponding to the fitting hole 14 b in the thick portion 14, and the ball plunger 9 is formed on the upper surface of the peripheral edge 24. The ball 9a is inserted so as to penetrate the fitting hole 14b and the fitting hole 26 in such a manner that the upper part of the ball 9a protrudes and retracts (see FIG. 9).

  Further, the peripheral edge portion 24 communicates with the through hole 22 and is recessed in the same shape as the waste discharge recess 15 of the main body 11, and the waste discharge recess 22 a that forms the cutting waste discharge port 36 together with the recess 15, A first axial concave portion 25 and a second axial concave portion 27 that extend along the axial direction in communication with the through hole 22 at two locations that are substantially point-symmetric with respect to the axial center with the discharge concave portion 22a interposed therebetween. Prepare. The first axial recess 25 and the second axial recess 27 allow the first protrusion 41 and the second protrusion 43 of the cutter holder 30 to be respectively viewed from above when a cutter holder 30 described later is inserted into the rotary drive unit 10. Each part is an acceptable part, and is formed in a size and shape slightly larger than the corresponding protrusions 41 and 43, respectively. As will be described in detail later, since the second protrusion 43 is formed with a longer circumferential length than the first protrusion 41, the second axial recess 27 corresponding to the second protrusion 43 is The length L2 in the direction is longer than the length L1 in the circumferential direction of the first axial recess 25. By these recesses 22a, 25, 27, the through-hole 22 is formed in a circular shape such that three portions bulge when viewed from above, and the peripheral edge 24 is relative to each recess 22a, 25, 27. Thus, the general portions 24b, 81, and 83 projecting to the inner peripheral side are provided.

  As shown in FIGS. 2, 4, and 5, the first axial recess 25 and the general portion 81 adjacent to the rotation direction (clockwise direction) of the rotation drive unit 10 in the circumferential direction are the first axis The end portion on the direction concave portion 25 side is formed so as to go out only on the lower surface side, and the cut-out portion is used as a first cutout portion 28 connected to the first axial direction concave portion 25, and above the first cutout portion 28. A portion 81a that is sandwiched between a flange portion 31 and a first projecting portion 41 (to be described later) of the cutter holder 30 when the cutter holder 30 is attached and fixed to the rotary drive portion 10 is fixed to a portion that protrudes toward the inner peripheral side, such as a ridge. To do. The first notch portion 28 is configured so that the first projecting portion 41 of the cutter holder 30 is located at a portion surrounded by the inner peripheral surface and the upper surface of the mounting seat 19 in a state where the fitting receiving portion 20 is mounted and fixed to the mounting seat 19. The first circumferential recess 61 is formed to be accommodated and fitted, and the length in the circumferential direction and the depth from the lower surface of the peripheral edge 24 are set to the first circumferential recess 61 when fixed to the mounting seat 19. The dimension is set such that the first protrusion 41 fits closely. The general portion 83 adjacent to the second axial recess 27 and the circumferential direction opposite to the rotation direction (clockwise direction) of the rotary drive unit 10 is the lower axial side of the end on the second axial recess 27 side. A portion that is formed so as to go through only the second cutout portion 29 that is continuous with the second axial recess 27 and that protrudes to the inner peripheral side like a ridge above the second cutout portion 29 Is a clamped portion 83a that is clamped between a flange portion 31 (to be described later) of the cutter holder 30 and the second projecting portion 43 when the cutter holder 30 is fixed to the rotary drive unit 10. The second notch 29 has the second projecting portion 43 of the cutter holder 30 at a portion surrounded by the inner peripheral surface and the upper surface of the mounting seat 19 in a state where the fitting receiving portion 20 is mounted and fixed to the mounting seat 19. The second circumferential recess 62 is formed so as to be accommodated and fitted. The length in the circumferential direction and the depth from the lower surface of the peripheral edge 24 are set to the second circumferential recess 62 when being fixed to the mounting seat 19. The dimension is set such that the second protrusion 43 is closely fitted.

  The ball plunger 9 has a ball 9a at the upper end and has a well-known configuration in which the ball 9a is urged upward by a coil spring disposed inside the outer cylinder portion 9b. As shown in FIG. The ball 9a is inserted so as to penetrate the fitting hole 14b of the main body part 11 and the fitting hole 26 of the fitting receiving part 20 in such a manner that the upper part of the ball 9a protrudes freely on the upper surface of the peripheral part 24.

  As shown in FIGS. 2 and 6 to 8, the cutter holder 30 is detachably attached to the rotation drive unit 10 so that the rotation center axis Y coincides with the axis of the electrode tip T at the time of polishing. A columnar holder main body portion 32 and a flange portion 31 formed so as to protrude outward in a disc shape at the upper edge of the holder main body portion 32 are provided.

  The holder main body 32 is configured to include receiving surfaces 33 and 34 that are recessed in a substantially hemisphere for receiving the tips of the pair of electrode tips T on both end surfaces in the vertical direction. The holder main body 32 is formed with a waste discharging notch 35 formed by cutting from the outer peripheral side to the vicinity of the center of the receiving surfaces 33, 34 so as to connect the receiving surfaces 33, 34. The notch 35 extends so as to enter the flange 31, and when the cutter holder 30 is attached to the rotary drive unit 10, the waste discharging recess 15 provided in the main body 11 and the fitting receiving part Together with the waste discharging recess 22 a provided at 20, a discharge port 36 for discharging cutting waste is configured. As shown in FIGS. 2 and 6 to 7, a screw hole 37 a is formed in the mounting surface 37 formed by the notch portion 35 in the holder main body portion 32 in the horizontal direction. 37a is fixed to the mounting surface 37 with screws.

  As shown in FIGS. 2, 7, and 8, two protrusions, that is, a first protrusion 41, and two points on the outer peripheral surface of the holder main body 32 that are substantially point-symmetric with respect to the axis center are provided. The second projecting portion 43 is provided so as to extend in the circumferential direction. When the first holder 41 is fixed to the rotary drive unit 10 of the cutter holder 30, the above-described sandwiched portion 81 a on the rotary drive unit 10 side is tightly fitted between the lower surface of the flange unit 31 without rattling. It is arranged at a position in the vertical direction. The second protrusion 43 is set to have a length L4 in the circumferential direction longer than a length L3 in the circumferential direction of the first protrusion 41, and to the rotational drive part 10 of the cutter holder 30 in the same manner as the first protrusion 41. When being fixed, the above-described sandwiched portion 83a on the rotation drive unit 10 side is disposed between the lower surface of the flange portion 31 so as to fit tightly without looseness. As described above, the first projecting portion 41 and the second projecting portion 43 are configured such that when the cutter holder 30 is inserted into the rotation driving unit 10 side, The protrusions 41 and 43 are respectively received in the axial recesses 27, and are formed in a shape and size slightly smaller than the corresponding axial recesses 25 and 27.

  As shown in FIGS. 2 and 6 to 7, a mark visual hole 31 a penetrating vertically is formed in the flange portion 31. When the cutter holder 30 is inserted into the rotation driving unit 10, the mark visual observation hole 31 a has a plurality of screws for fixing the mark 8 provided on the rotation driving unit 10, that is, the fitting receiving unit 20 to the mounting seat 19 of the main body 11. The head 8 colored in yellow in the specific screw 7 </ b> A that is one of 7 is made visible through the mark visual hole 31 a so that it can be used for alignment with the rotation drive unit 10. As shown in FIG. 9, the mark visual hole 31 a has the first protrusion 41 and the second protrusion 43 at the same position above the first axial recess 25 and the second axial recess 27, that is, each protrusion. When the portions 41 and 43 are arranged at positions where they can be immersed in the corresponding axial recesses 25 and 27, they are formed at positions that coincide with the mark 8 in the vertical direction. Moreover, as shown in FIG.2 and FIG.6, in the upper surface of the flange part 31, two places which correspond in the circumferential direction with the 1st protrusion part 41 and the 2nd protrusion part 43, in other words, the 1st protrusion part 41 and the 2nd Anti-slip portions 31c and 31c made up of several dimple-like depressions are formed at two locations that are directly above the protruding portion 43. As shown in FIGS. 2, 6, and 7, a concave portion 31 b on a hemisphere into which the ball 9 a of the ball plunger 9 can be fitted is formed on the lower surface of the flange portion 31. The position where the recess 31b is formed is when the first protrusion 41 and the second protrusion 43 are fitted into the first circumferential recess 28 and the second circumferential recess 29 on the rotation drive unit 10 side, respectively. The position corresponds to the ball plunger 9.

  In the chip dresser M configured as described above, a mode in which the cutter holder 30 including the cutter 5 is attached to and detached from the rotation driving unit 10 will be described below.

  The rotation driving unit 10 is embedded in the tip end side of the bed portion 4 of the chip dresser M in a state where the fitting receiving unit 20 is fixedly attached to the mounting seat 19 in the main body unit 11. In order to attach the cutter holder 30 to the rotation drive unit 10, as shown in FIG. 9, first, the cutter holder 30 is immersed in the insertion hole 12 in the rotation drive unit 10. Since the cutter holder 30 includes the first protrusion 41 on the outer peripheral surface and the second protrusion 43 having a different length in the circumferential direction from the first protrusion 41, the cutter holder 30 has a shape on the rotation drive unit 10 side. The cutter holder 30 must be arranged with respect to the rotary drive unit 10 so that the projecting portions 41 and 43 are respectively immersed in the first axial concave portion 25 and the second axial concave portion 27 provided in correspondence. Don't be. For this reason, when the cutter holder 30 is gripped, the cutter holder 30 is gripped in such a direction that the protrusions 41 and 43 approach the corresponding recesses 25 and 27. When the cutter holder 30 is disposed in the vicinity of the upper part of the rotation drive unit 10, the first projecting part 41 and the second projecting part 43 are hidden by the flange part 31 and cannot be visually recognized from above, but several on the upper surface of the flange part 31. Since the non-slip portions 31c and 31c formed by the individual depressions are formed directly above the first protrusion 41 and the second protrusion 43, the anti-slip portions 31c and 31c are formed in the first axial recess 25. And the second axial recess 27 may be brought closer. On the rotation drive unit 10 side, the head 8 of the specific screw 7A is colored yellow so as to be visually distinguishable from surrounding members as the mark 8, while on the cutter holder 30 side, When the projecting portions 41 and 43 are disposed at positions where they can be immersed in the corresponding axial recesses 25 and 27, a mark visual hole 31a is provided at a position directly above the mark 8 so that the mark 8 can be seen from above. ing. In other words, if the cutter holder 30 is disposed at a position where the mark 8 can be visually recognized through the mark visual hole 31a, the projecting portions 41 and 43 are formed in the corresponding axial recesses 25 and 27 on the rotation drive unit 10 side. It can be placed in an immersive position. Since the rotation drive unit 10 is horizontally attached to the bed 4 of the dresser M, if the cutter holder 30 is dropped directly under this condition, the cutter holder 30 is inserted into the insertion hole of the rotation drive unit 10 as shown in FIG. 12 can be easily aligned and immersed.

  When the protrusions 41 and 43 are immersed in the corresponding axial recesses 25 and 27, the protrusions 41 and 43 are attached to the mounting seat 19 of the main body 11 in the rotation drive unit 10, that is, the upper surface of the stepped portion 18. The ball 9a of the ball plunger 9 that abuts and protrudes from the upper surface of the fitting receiving portion 20 is pushed downward by the lower surface of the flange portion 31 of the cutter holder 30 and is in a state of being submerged inside the outer cylindrical portion 9b. From this state, as shown by a two-dot chain line in FIG. 11A, the cutter holder 30 is rotated about 30 ° counterclockwise, which is the direction opposite to the rotation direction of the rotation driving unit 10. Then, each protrusion 41, 43 slides on the mounting seat 19, and as shown in FIGS. 10 and 11B, the first cutout portion 28 and the second cutout formed in the fitting receiving portion 20 are provided. The first circumferential direction recessed portion 61 and the second circumferential direction recessed portion 62 surrounded by the inner circumferential surface of the portion 29, the upper surface of the mounting seat 19, respectively. The front ends 43a of the two protrusions 43 are in contact with the bottom surface 61a of the first circumferential recess 61 and the bottom surface 62a of the second circumferential recess 62, respectively. At this time, as shown in FIG. 10, the first projecting portion 41 is sandwiched between the sandwiched portion 81a and the mounting seat 19, and the second projecting portion 43 is sandwiched between the sandwiched portion 83a and the mounting seat 19, while fitting. The sandwiched portion 81a in the receiving portion 20 is sandwiched between the flange portion 31 and the first projecting portion 41, and the sandwiched portion 83a is sandwiched between the flange portion 31 and the second projecting portion 43 so that the cutter holder 30 is The rotary drive unit 10 is securely fastened and fixed without rattling. At this time, the ball 9a is immersed in the concave portion 31b provided on the lower surface of the flange portion 31 of the cutter holder 30 corresponding to the position of the ball plunger 9 at this position, and a clicked feeling is given.

  When the chip dresser M is operated in this attached state, the driving force of the motor 50 is transmitted to the gear 16 via the gears 50a and 53, and the rotation driving unit 10 rotates clockwise as shown in FIG. 11A. Then, the driving force is reliably transmitted from the rotary driving unit 10 to the cutter holder 30 that is firmly clamped and fixed, and the electrode tip T is polished.

  In order to remove the cutter holder 30 from the rotary drive unit 10 for maintenance or replacement of the cutter 5, hold the flange portion 31 of the cutter holder 30 with a finger or the like, in the opposite direction (clockwise direction in FIG. Turn the cutter holder 30 about 30 °. Then, the 1st protrusion part 41 and the 2nd protrusion part 43 remove | deviate from the 1st circumferential direction recessed part 61 and the 2nd circumferential direction recessed part 62, respectively, and the lower surface of the flange part 31 in which the ball | bowl 9a of the ball plunger 9 was immersed. The peripheral edge of the concave portion 31 a gets over the ball 9 a, and the cutter holder 30 becomes removable from the rotation driving unit 10. In particular, in the present embodiment, since the anti-slip portions 31c and 31c are formed on the upper surface of the flange portion 31, it becomes a clue when turning with a finger and can be easily removed.

  In the chip dresser M of the present embodiment, the first protrusion 41 and the second protrusion 43 are provided so as to extend in the circumferential direction at positions substantially symmetrical with respect to the axial center on the outer peripheral surface of the cutter holder 30. Is provided. On the rotation drive unit 10 side, a first axial recess 25 that communicates with the insertion hole 12 through which the cutter holder 30 is inserted and extends along the axial direction so that the first protrusion 41 can be received from above, and a first axial recess 25. A first circumferential recess 61 is formed extending from the lower portion of the rotary drive portion 10 to the opposite side to the rotational direction of the rotation driving portion 10 and fitting the first protrusion 41. A second axial recess 27 extending along the axial direction so as to be receivable from above, and a lower portion of the second axial recess 27 extends in an L shape on the opposite side to the rotational direction of the rotary drive unit 10. A second circumferential recess 62 into which the protrusion 43 is fitted is formed. According to this configuration, the attachment and fixing of the cutter holder 30 to the rotation drive unit 10 in the dresser body 1 is performed by connecting the first protrusion 41 and the second protrusion 43, the first axial recess 25, and the second axial recess 27. After inserting the cutter holder 30 into the insertion hole 12 of the rotation drive unit 10 along the axial direction so as to be immersed in the rotation drive unit 10, the cutter holder 30 is turned counterclockwise on the opposite side to the rotation direction of the rotation drive unit 10. The first protrusion 41 and the second protrusion 43 are inserted into the first circumferential recess 61 and the second circumferential recess 62, respectively. That is, the cutter holder 30 and the rotary drive unit 10 are provided. Since it is configured to be connectable by a bayonet method, it is not necessary to fix the screw, and therefore the cutter holder 30 can be attached and fixed to the rotary drive unit 10 without worrying about procurement of tools or loss of screws. It is possible to improve. Also, the cutter holder 30 can be removed simply by pressing the upper surface of the cutter holder 30 with a finger and turning it in the opposite direction to the time of attachment to move each protrusion of the cutter holder to each axial recess as the release position. Both can be done without using tools.

  In the chip dresser M of the present embodiment, the first protrusion 41 and the second protrusion 43 of the cutter holder 30 are formed with different lengths in the circumferential direction, while the short first protrusion 41 is formed. The corresponding first axial recess 25 is formed so as to correspond to the size and shape of the first protrusion 41 so that the second protrusion 43 cannot be received. Can be inserted at the correct position. That is, as a comparative example, two protrusions arranged symmetrically with respect to the axis center and two axial recesses on the side of the rotational drive unit are formed with the same dimensions, and one protrusion is If it is formed so as to be immersible in the axial recess, the state in which it is inverted by 180 ° when it is not inserted into the correct axial recess, that is, the scrap discharge notch 35 on the cutter holder 30 side is rotated. It will be fitted in a state that does not match the waste discharging recesses 15 and 22a on the drive unit 10 side. In such a case, re-installation is required and workability is reduced. Therefore, compared with such a comparative example, in the configuration of the present embodiment, the cutter holder 30 can be reliably inserted into the rotational drive unit 10 at a correct position.

  Further, in the chip dresser M of the embodiment, the fitting receiving portion 20 on the rotation drive portion 10 side constitutes the upper surface of each circumferential recess 61, 62 and is opposed to each recess 61, 62 on the inner peripheral side. While having clamped portions 81a and 83a formed so as to protrude, on the cutter holder 30 side, the protruding portions 41 and 43 are flange portions when the outer peripheral surface of the main body portion 32 is fixed to the rotary driving portion 10. Between the lower surface of 31, it is arrange | positioned in the position of the up-down direction which can insert | insert the to-be-clamped part 81a and 83a closely. According to this configuration, when the cutter holder 30 is inserted and inserted into the insertion hole 12 of the rotation driving unit 10 and rotated so that the protrusions 41 and 43 are fitted in the circumferential recesses 61 and 62, the rotation holder 10 side is clamped. In addition to clamping the projections 41 and 43 by the portions 81a and 83a and the mounting seat 19, the clamped portions 81a and 83a on the rotation drive unit 10 side are formed by the lower surface of the flange 31 on the cutter holder 30 side and the projections 41 and 43. Since the rotation drive unit 10 and the cutter holder 30 are tightened with each other, there is no backlash in the axial direction, and the tightening and fixing state is inferior to the case of fixing with conventional screws. can get.

  In the tip dresser M of the embodiment, the rotation drive unit 10 is an annular shape screwed to a main body 11 provided with a gear 16 and a mounting seat 19 provided along the inner periphery of the insertion hole 12 in the main body 11. The fitting receiving part 20 is provided, and the fitting receiving part 20 is formed with a first axial recess 25 and a second axial recess 27. The fitting receiving part 20 is also provided with a lower part of each of the axial recesses 25 and 27, a first notch part 28 connected to the opposite side of the rotational direction of the rotational drive part 10 in the circumferential direction, and a second notch part. 29, and the first circumferential recess 61 and the second circumferential recess 62, which are portions into which the protrusions 41 and 43 are inserted, are the upper surface of the mounting seat 19, the notches 28 and 29, and It is the structure which consists of the space enclosed by the inner peripheral surface. In this configuration, the axial recesses 25 and 27 for inserting the projections 41 and 43 of the cutter holder 30 in the axial direction and the notches 28 and 29 constituting the circumferential recesses 61 and 62 are provided in the main body 11. Since it is provided in the separate fitting receiving portion 20, compared with the case of processing so that those portions are integrally provided in the main body portion 11, the rotation drive portion 10 that enables a bayonet mounting structure is provided. Man-hours and costs for manufacturing can be reduced. If these points are not taken into account, the fitting receiving portion 20 is not used separately, and each projection in the cutter holder can be received in the axial direction, and each projection is fitted by turning after the cutter holder is inserted. The circumferential recesses to be combined may be provided integrally with the main body of the rotation driving unit.

  Further, in the chip dresser M of the embodiment, the head 8 of the specific screw 7A, which is one of the plurality of screws 7 for attaching and fixing the fitting receiving portion 20 to the main body portion 11, is used as the mark 8 as another screw. It is colored so that it can be visually distinguished from the metallic color of the upper surface of the peripheral edge 24 of the head 7b and the fitting receiving part 20. On the other hand, when the cutter holder 30 is arranged so that the protrusions 41 and 43 are aligned with the corresponding axial recesses 25 and 27 of the rotation drive unit 10 in the vertical direction, the position is aligned with the mark 8 in the vertical direction. In addition, a mark visual hole 31a penetrating in the axial direction is provided. According to this configuration, when the cutter holder 30 is inserted into the rotation driving unit 10, the mark 8 is hidden through the mark visual hole 31a even if the position of each of the projecting parts 41 and 43 cannot be visually recognized from above by being hidden by the flange part 31. If the cutter holder 30 is arranged with respect to the rotation drive unit 10 at a position where the projection can be seen, the projections 41 and 43 can be easily arranged at positions where they can be immersed in the corresponding axial recesses 25 and 27. Therefore, the cutter holder 30 and the rotation drive unit 10 can be easily aligned, and it is not necessary to search for the axial recesses corresponding to the protrusions 41 and 43 by hand. As described above, the configuration in which the mark 8 is provided on the head of the specific screw 7A is compared with the case where the mark is formed on a portion where it is difficult to mark the product without variation such as the upper surface of the fitting receiving portion 20. Easy. However, if this point is not taken into consideration, it is possible to provide the mark 8 by providing a colored portion or a concave portion in any part of the rotation drive portion on the upper surface side visible from above. Good.

  Further, in the chip dresser M of the embodiment, the ball plunger 9 is fitted on the upper surface of the fitting receiving portion 20 in the rotation driving portion 10 in such a manner that the upper portion of the ball 9a protrudes freely. 26 on the other hand, on the cutter holder 30 side, the ball 9a of the ball plunger 9 is placed on the lower surface of the flange 31 with the projections 41 and 43 fitted in the circumferential recesses 61 and 62, respectively. The recessed part 31b to insert is provided. For this reason, when the cutter holder 30 is turned after being inserted into the insertion hole 12 of the rotation drive unit 10 and the projections 41 and 43 are fitted in the circumferential recesses 61 and 62, the balls 9a are fitted into the recesses 31b. A moderation can be given.

  In the present embodiment, the non-slip portions 31c and 31c provided on the upper surface of the flange portion 31 of the cutter holder 30 are exemplified by a plurality of dimple-like depressions. However, the configuration of the anti-slip portion is limited to this. For example, it is possible to use one having an arbitrary configuration such as arranging a plurality of linear protrusions having a triangular cross section in the shape of a washing plate at the same position on the upper surface of the flange portion 31.

5 ... Cutter 7 ... Screw 7A ... Specific screw 8 ... Mark 9 ... Ball plunger 9a ... Ball 10 ... Rotation drive part 12 ... Insertion hole 16 ... Gear DESCRIPTION OF SYMBOLS 19 ... Mounting seat 20 ... Fitting receiving part 25 ... 1st axial direction recessed part 27 ... 2nd axial direction recessed part 28 ... 1st notch part 29 ... 2nd notch part 30 ... Cutter holder 31 ... Flange part 32 ... Main body part 31a ... Mark visual observation hole 31b ... Recess part 41 ... First protrusion part 43 ... Second protrusion part 50 ... Motor 61 ... 1st circumferential direction recessed part 62 ... 2nd circumferential direction recessed part 81a ... 1st to-be-clamped part 83a ... 2nd to-be-clamped part T ... Electrode tip M ... Chip dresser

Claims (5)

In a chip dresser comprising: a rotary drive unit provided with a gear driven by a motor; and a cutter holder provided with a cutter for polishing a pair of electrode tips, and detachably attached and fixed to the axial center of the rotary drive unit.
The cutter holder is provided so as to extend in a circumferential direction on a columnar main body, a flange projecting outward at an upper edge of the main body, and an outer peripheral surface of the main body below the flange. A first protrusion that extends in the circumferential direction at a position substantially symmetrical with the first protrusion with respect to the axial center, and has a length in the circumferential direction larger than that of the first protrusion. A second projecting portion,
The rotational drive unit is
An insertion hole arranged in the center and through which the cutter holder is inserted;
A first axial recess that extends along the axial direction and is engaged with the first protrusion, the first protrusion being receivable from above, the second protrusion being unreceivable, and communicating with the insertion hole. A first circumferential recessed portion extending from the lower portion of the first axial recessed portion to the opposite side to the rotational direction of the rotational drive portion in the circumferential direction;
A second axial recess extending in the axial direction so as to be able to receive the second protrusion from above, and a lower portion of the second axial recess so as to be able to receive the second protrusion. A second circumferential recess extending from the rotation direction of the rotation drive unit in the circumferential direction opposite to the rotation direction;
The upper surface of each circumferential recess, and a first sandwiched portion that is formed so as to protrude toward the inner peripheral side relative to each circumferential recess, and a second sandwiched portion,
With
The cutter holder is inserted into the insertion hole so that the first projecting portion and the second projecting portion are immersed in the respective axial recesses, and is rotated in the direction opposite to the rotation direction of the rotation driving unit, so that each projecting portion is The first projecting portion and the second projecting portion are formed at positions where the respective sandwiched portions are sandwiched between the flange portions when the first projecting portion is inserted into each circumferential recess. Chip dresser. The rotational drive unit includes an annular fitting receiving part that is fixedly attached by a plurality of screws to a mounting seat provided along the inner periphery of the insertion hole,
A first notch portion and a second notch portion that are connected to the lower portion of each axial recess on the opposite side of the rotation direction of the rotation drive portion in the circumferential direction; Formed,
Each said circumferential direction recessed part is comprised from the space enclosed by the upper surface of the said mounting seat, and the internal peripheral surface of a said 1st notch part and a 2nd notch part, The Claim 1 characterized by the above-mentioned. The described chip dresser. The rotational drive unit includes a mark on the upper surface part configured to be visually distinguishable from surrounding members,
The cutter holder is provided with a mark visual hole penetrating in the axial direction at a position directly above the mark when the cutter holder is arranged so that the protrusions coincide with the axial recesses in the vertical direction. The chip dresser according to claim 1 or 2, characterized by the above-mentioned. The chip dresser according to claim 3, wherein the mark is provided on a head of a specific screw that is one of the plurality of screws. The rotation drive unit further includes a ball plunger in which a ball is disposed on an upper surface of the rotation drive unit so as to appear and retract,
The concave portion into which the ball of the ball plunger is fitted in a state in which the protrusions are fitted in the circumferential direction portions is provided on the lower surface of the flange portion of the cutter holder. The chip dresser according to claim 4.

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