JP2007061927A - Grinding wheel dresser apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding wheel dresser apparatus which eliminates the time and trouble required for dressing work, reducing the dressing time, prevents cracks of a rotary grinding wheel, and achieves high accuracy. <P>SOLUTION: This grinding wheel dresser apparatus 10 for machining the shape of at least two sides of the grinding stone 12, includes: first and second rotary grinding wheels 17, 18, which are disposed opposite to each other with the grinding stone 12 at the center, and provided with first and second support frames 13, 14, and driven in rotation by first and second rotary driving sources 15, 16; first and second grinding stone angle changing mechanisms 19, 20 for rotating the first and second support frames 13, 14, respectively to change an angle α made by facing the first and second rotary grinding wheels 17, 18 to each other; and a forward and backward moving mechanism 21 loaded with the first and second grinding stone angle changing mechanisms 19, 20, and fitted to a base member 25 to move in the direction of both sides of the grinding stone 12, and thereby varying the spaces K of the first and second rotary grinding wheels 17, 18 to the grinding stone 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a grindstone dresser device that performs shape processing on both sides of a grindstone mounted on a grinding machine.

Conventionally, in a grinding machine, a dressing process is performed on a side peripheral portion of a grinding wheel. Under such circumstances, even with an extremely thin grinding wheel width, it is possible to eliminate the escape of the rotating grinding wheel during dressing processing, enable accurate dressing processing, and improve the sharpness of the diamond tool. As a grinding wheel dresser device that performs dressing from the horizontal direction on the peripheral edge of the side surface of a grinding wheel is known (for example, see Patent Document 1).

JP 2002-224955 A (FIGS. 1 to 3)

However, in such a grindstone dresser device, the load applied to the grinding wheel is determined by the width of the rotating grindstone. Therefore, the rotating grindstone is exchanged between roughing and finishing, or a rotating grindstone for finishing grinding is used from the beginning. There is no choice but to do the dressing over time, and in any case, the dressing work is time-consuming and prevents the dressing time from being shortened.
Furthermore, a rotating grindstone for finishing must be thin (for example, 0.2 mm) due to load, and the grindstone is often cracked because of its low rigidity. It was also a factor causing a decline.

The present invention has been made in view of such circumstances, and provides a grindstone dresser device that eliminates the labor required for dressing work, shortens the dressing time, eliminates cracking of the rotating grindstone, and realizes high precision dressing. For the purpose.

A grindstone dresser device according to the present invention that meets the above object is a grindstone dresser device that performs shape processing on at least both sides of a grindstone mounted on a grinding machine, and is arranged around the grinding grindstone, The first and second rotary grindstones that are arranged to face each other with a second support frame and are rotationally driven by the first and second rotational drive sources, and the first and second support frames, respectively. The first and second grindstone angle changing mechanisms that rotate to change the facing angle of the first and second rotating grindstones, and the first and second grindstone angle changing mechanisms, respectively, are mounted, and a base member And an advancing / retreating mechanism that moves in both directions of the grinding wheel and changes the distance between the first and second rotating wheels with respect to the grinding wheel.

In the grindstone dresser device according to the present invention, the advance / retreat mechanism includes an auxiliary distance adjusting mechanism that independently adjusts an interval between the first and second rotating grindstones and the grinding grindstone, and the first and second rotating grindstones. It is preferable to provide an inter-whetstone distance adjusting mechanism that approaches and separates in synchronization.
In the grindstone dresser device according to the present invention, it is preferable to provide a scale for measuring an interval between the first rotating grindstone and the second rotating grindstone.

The grindstone dresser device according to any one of claims 1 to 3 is disposed around the grinding grindstone, and is disposed to face each other with the first and second support frames, and by the first and second rotational drive sources. The facing angle of the first and second rotating grindstones that are rotationally driven can be changed by rotating the first and second support frames by the first and second grindstone angle changing mechanisms. The load during dressing on the grinding wheel can be controlled, so that it is not necessary to replace the first and second rotary wheels for roughing and finishing, or for finishing grinding from the beginning. Since there is no need for time-consuming dressing with the first and second rotating grindstones, the labor required for the dressing operation can be saved and the dressing time can be shortened. Moreover, the widths of the first and second rotary whetstones can be increased. As a result, cracking of the first and second rotary whetstones can be prevented, the degree of freedom in forming the grinding whetstones can be improved, and dressing can be performed. High accuracy can be realized.

In particular, in the grindstone dresser device according to claim 2, since the advance / retreat mechanism includes an auxiliary distance adjustment mechanism and a distance adjustment mechanism between the grindstones, the auxiliary distance adjustment mechanism first fixes the position of the grinding wheel. After the second rotating grindstone is brought into contact with the grinding wheel independently and the setup work is performed, the first and second rotating grindstones are brought close to each other by the distance adjusting mechanism between the grindstones and the cutting work is performed. As a result, workability is improved.

In the grindstone dresser device according to claim 3, since the scale for measuring the interval between the first rotating grindstone and the second rotating grindstone is provided, the first and second rotating grindstones are respectively applied to the grinding grindstone. Since the required dressing operation can be performed according to the measured value while measuring the width of the grinding wheel in contact, workability is improved.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a perspective view of a grindstone dresser device according to an embodiment of the present invention, FIG. 2 is a partially omitted perspective view of the grindstone dresser device, FIG. 3 is a plan view of the grindstone dresser device, and FIG. FIG. 5 is an explanatory view showing a dressing state of the grinding wheel by the first and second rotating wheels of the grinding wheel dresser device.

As shown in FIG. 1, a grindstone dresser device 10 according to an embodiment of the present invention performs shape processing on at least both sides of a grindstone 12 mounted on, for example, a column side of a grinder provided with a slide table 11. It is a device to perform. Here, the slide table 11 is movable in the front-rear and left-right directions, and the grinding wheel 12 is configured to be movable up and down.

As shown in FIGS. 1-5, the grindstone dresser apparatus 10 is arrange | positioned centering | focusing on the grinding grindstone 12, and is provided with the 1st, 2nd support frames 13 and 14, respectively, and is arrange | positioned facing each other, and 1st The first and second rotary grindstones 17 and 18 are rotationally driven by DC motors 15 and 16 which are examples of the second rotational drive source. The grindstone dresser device 10 further rotates the first and second support frames 13 and 14 to change the facing angle α of the first and second rotating grindstones 17 and 18 respectively. The grindstone angle changing mechanisms 19 and 20 and the first and second grindstone angle changing mechanisms 19 and 20 are mounted, attached to the base member 25, moved in both directions of the grinding wheel 12, and attached to the grinding wheel 12. And an advancing / retreating mechanism 21 that changes the distance K between the first and second rotating grindstones 17 and 18.

The advancing / retreating mechanism 21 includes auxiliary distance adjusting mechanisms 22 and 23 that independently adjust the distances k ₁ and k ₂ between the first and second rotating grindstones 17 and 18 and the grinding grindstone 12, and the grinding grindstone 12 in the center. 1 and 2 and a grindstone distance adjusting mechanism 24 that approaches and separates the second rotating grindstones 17 and 18 in synchronization. These will be described in detail below. In order to simplify the description, the direction of the disc (disk) of the grinding wheel 12 is the front-rear direction, and the forward and backward directions of the first and second rotating wheels 17 and 18 (both sides of the grinding wheel 12) are the left-right direction. Define.

As shown in FIG. 1 to FIG. 4, the disc-shaped grinding wheel 12 is provided so as to be able to rotate and to be detachable overhanging on the column side. The grinding wheel 12 has an outer diameter D of 80 to 300 mm (150 mm in the present embodiment) and a thickness X of 2 to 8 mm (3 mm in the present embodiment).
On the slide table 11, a base member 25 having a U-shaped cross section is fastened with screws so that the lower surface of a rectangular bottom plate 26 abuts against the slide table 11 and can be removed. Rectangular side plates 27 and 28 are erected on opposite ends of the bottom plate 26 of the base member 25, respectively.
On the bottom plate 26 between the side plates 27 and 28, lower guide rails 29 and 30 having a rectangular cross section with a space in the front-rear direction are provided in the left-right direction.

Slide blocks 31 and 32 having a substantially rectangular parallelepiped shape and formed with groove portions that fit on the upper side of the lower guide rails 29 and 30 are arranged so as to be slidable in the left-right direction along the lower guide rails 29 and 30. . A rectangular first table 33 is mounted on the upper surface of the slide block 31 disposed on one side of each of the lower guide rails 29 and 30 so that the upper surface is horizontal when viewed from above. A second table 34 having a rectangular shape in a plan view is attached to the upper surface of each of the slide blocks 32 arranged on the other side. The first table 33 and the second table 34 are arranged with a minimum gap G (for example, 20 to 50 mm, 30 mm in the present embodiment).

A feed screw shaft 35 that penetrates the side plate 27 of the base member 25 and extends in the left-right direction and is rotatably supported via a bearing (not shown) is disposed horizontally. An intermediate portion of the feed screw shaft 35 is located on the bottom plate 26. Is supported by a rectangular parallelepiped bearing block 36 via a bearing (not shown). A feed handle 37 is provided at the proximal end of the feed screw shaft 35. A right male screw and a left male screw are formed in predetermined ranges on both sides of the feed screw shaft 35 with the bearing block 36 in between.

A block-shaped nut member (not shown) formed with a right female screw and a left female screw respectively engaged with the right male screw and the left male screw of the feed screw shaft 35 on the lower surfaces of the first and second tables 33 and 34. Is installed. Here, the inter-whetstone distance adjusting mechanism 24 includes lower guide rails 29 and 30, slide blocks 31 and 32, the nut member, a feed screw shaft 35, a feed handle 37, and first and second tables 33. , 34. With this configuration, the first table 33 and the second table 34 can be synchronized and moved apart by rotating the feed handle 37 of the inter-whetstone distance adjusting mechanism 24 forward and backward.

The feed handle 37 is provided with a scale capable of setting the cutting amounts of the first and second rotating grindstones 17 and 18. The first and second tables 33 and 34 cover the lower guide rails 29 and 30, the slide blocks 31 and 32, the feed screw shaft 35, the bearing block 36, the nut member and the bottom plate 26, respectively. When the second rotating grindstones 17 and 18 approach each other, a dustproof and safety cover (not shown) in which the inner portions overlap with each other is detachably provided.

On the first and second tables 33 and 34, upper guide rails 38 and 39 having inverted trapezoidal cross sections are provided in the same direction as the lower guide rails 29 and 30, respectively. Sliding members 40, 41 having a rectangular parallelepiped outer shape in which a dovetail recess that fits on the upper side of the upper guide rails 38, 39 is formed on the lower side and the first and second grinding wheel angle changing mechanisms 19, 20 are provided. Are slidable in the left-right direction along the upper guide rails 38 and 39, respectively.

Rectangular plate-like slide pushing brackets 42 and 43 formed with female screws are fixed to the outer ends of the upper guide rails 38 and 39, respectively, and male screws that are screwed into the female screws of the slide pushing brackets 42 and 43 are provided. The tail ends of the formed bolts 44 and 45 are in contact with the outer side surfaces 46 and 47 of the slide members 40 and 41. Further, a long hole (not shown) formed in the sliding direction in the sliding members 40 and 41 so that the sliding members 40 and 41 whose slide positions are adjusted can be fixed to the upper guide rails 38 and 39, and this The upper guide rails 38 and 39 and locking bolts (not shown) that can be fixed and released can be provided.

Here, the auxiliary distance adjusting mechanism 22 includes an upper guide rail 38, a slide member 40, a slide pushing bracket 42, a bolt 44 and the locking bolt, while the auxiliary distance adjusting mechanism 23 is provided with an upper guide rail 39. , A slide member 41, a slide pushing bracket 43, a bolt 45, and the locking bolt.
With this configuration, the auxiliary distance adjusting mechanisms 22 and 23 respectively move the slide members 40 and 41 toward the grinding wheel 12 by the rotation of the bolts 44 and 45, respectively, and thereby the first and second rotating wheels 17 and 18. And the distances k ₁ and k ₂ between the grinding wheels 12 can be adjusted.

The slide members 40 and 41 are respectively formed with rotation holes 48 and 49 having a circular cross section in a direction perpendicular to the slide direction, and are disposed to face each other in the rotation holes 48 and 49. Rotating shafts 54 and 55 provided orthogonal to the bottom surfaces 52 and 53 of the rectangular bottom plates 50 and 51 of the first and second support frames 13 and 14 having an L-shaped cross section are disposed. On the upper side of the slide members 40 and 41, female screws are formed, which are perpendicular to the rotation holes 48 and 49 in the vertical direction and engage with the male screws of the fixing bolts 56 and 57 for fixing the rotation shafts 54 and 55, respectively. Screw holes 58 and 59 are provided.

The rotary shafts 54 and 55 and the front ends of the fixing bolts 56 and 57 have a regular hexagonal cross section with an outer shape smaller than the outer diameter of the bolt. In addition, a step is provided on the distal end side of the rotation shafts 54 and 55 so that the rotation shafts 54 and 55 in the slide members 40 and 41 do not move in the axial direction on the first and second support frames 13 and 14 side. The stepped portion is in contact with the stepped portion formed in the rotation holes 48 and 49.

The first and second grindstone angle changing mechanisms 19 and 20 include rotating shafts 54 and 55, slide members 40 and 41, and fixing bolts 56 and 57.
With this configuration, the fixing bolt 56 (57 is also the same) is rotated with a hexagon wrench to loosen the rotation shaft 54 (55 is also the same), and the rotation shaft 54 is rotated to a predetermined angle with the hexagon wrench. The rotating shaft 54 can be fixed with a hexagon wrench. Further, as shown in FIG. 5, the first and second rotary grindstones 17 and 18 fixed to the slide members 40 and 41 are moved to the first and second tables 33 and 34 by the inter-whetstone distance adjusting mechanism 24, respectively. Through (incision) and separation can be performed synchronously.

A flange mounting type DC motor is provided on the surfaces 62a and 63a of the rectangular mounting plates 62 and 63 of the first and second support frames 13 and 14 provided orthogonally to one side ends of the bottom plates 50 and 51. 15 and 16 are attached. The first and second rotary grindstones 17 and 18 of the cup type are fastened to the output shafts of the DC motors 15 and 16 via a coupling (not shown) and a flange-type grindstone mounting member provided on the coupling. Removably attached. The first and second rotating grindstones 17 and 18 are rotated in the same direction as the rotating grinding wheel 12 and faster than the rotational speed (circumferential speed) of the grinding wheel 12 to dress the grinding wheel 12. It is like that.
The forward / reverse rotation of the DC motors 15 and 16 can be switched to switch the rotation directions of the first and second rotating grindstones 17 and 18, and the maximum rotational speed of the DC motors 15 and 16 is 3000 rpm.

As shown in FIG. 5, the first and second rotating grindstones 17, 18 arranged to face each other at the facing angle α are respectively ring ring-shaped mounting portions 64, 65 and outer sides of the mounting portions 64, 65. Short cylindrical cutting parts 66 and 67 provided on the circumference of the first and second rotary whetstones 17 and 18 are attached to the whetstone attaching members. For this purpose, a plurality of bolt holes 68 are formed.

The outer diameter d of the first and second rotating grindstones 17 and 18 is 50 to 120 mm (65 mm in the present embodiment), the inner diameter n is 25 to 40 mm (32 mm in the present embodiment), and the mounting portions 64 and 65. The thickness T is 3 to 8 mm (5 mm in the present embodiment), the thickness W of the cutting portions 66 and 67 is 1 to 3 mm (2 mm in the present embodiment), and the length L of the cutting portions 66 and 67 is Is 5 to 10 mm (8 mm in this embodiment). In addition, around the outer periphery of the first and second rotary whetstones 17 and 18, a safety cover having a concave cross section is avoided so as to avoid a portion that contacts the grinding whetstone 12 of the first and second rotary whetstones 17 and 18. Is provided.

As shown in FIG. 5, the first and second rotating grindstones 17 and 18 are arranged facing each other at an angle α, and the outer peripheral corners 69 and 70 of the cutting portions 66 and 67 are arranged at the periphery of the grinding stone 12. It can contact both side surfaces 71 and 72 of the part. In this way, by changing the facing angle α, the load during dressing on the grinding wheel 12 can be controlled. In addition, since the outer peripheral corners 69 and 70 of the cutting portions 66 and 67 are in contact with both side surfaces 71 and 72 of the peripheral edge of the grinding wheel 12, the contact resistance can be reduced and the degree of freedom in forming the grinding wheel 12. Will improve.

As shown in FIG. 3, a mounting bracket 73 is provided on one side surface of the slide member 40, and a spindle type dial gauge 74, which is an example of a scale, is attached to the mounting bracket 73 via a stem 75. . On the other hand, a mounting bracket 76 is provided on one side surface of the slide member 41 so as to face the mounting bracket 73, and a gauge head 79 with which a measuring element 78 provided at the tip of the spindle 77 contacts the mounting bracket 76. Is provided horizontally.
With this configuration, it is possible to measure the distance K between the first rotating grindstone 17 and the second rotating grindstone 18 that are rotatably provided on the slide members 40 and 41 and the molding thickness t of the grinding grindstone 12. A handle (not shown) is provided on each of the outer side surfaces of the side plates 27 and 28 of the base member 25 so as to be gripped manually.

Next, a usage method and an operation (or operation) of the grindstone dresser device 10 according to the embodiment of the present invention will be described with reference to the drawings. The outer diameter D of the grinding wheel 12 is 150 mm, the thickness X is 3 mm, and the thickness t after dressing is 0.5 mm.
The slide table 11 is slid and moved to one end side in the front-rear direction, and an unground grinding wheel 12 is set at a predetermined mounting position on the column side.

The grindstone dresser device 10 is mounted on the slide table 11 in accordance with the mounting position of the grinding wheel 12, and the first and second grindstone angle changing mechanisms 19, 20 are used as shown in FIG. Are arranged opposite each other at an angle α (30 °), and, as shown in FIG. 3, the first and second rotary wheels 17, interval k ₁ between 18 and grinding wheel 12 is set so that k ₂ is formed.
The slide table 11 is slid to the mounting position of the grinding wheel 12 so that the grinding wheel 12 is sandwiched between the first and second rotary grinding wheels 17 and 18 of the grinding wheel dresser device 10.

The auxiliary distance adjusting mechanism 23 causes the second rotating grindstone 18 on the column side to come into contact with one side surface of the lower portion of the grinding wheel 12, and then the first rotating grindstone 17 on the operator side is moved by the auxiliary distance adjusting mechanism 22. It contacts with the other side of the lower part of the grinding wheel 12.
The thickness X of the grinding wheel 12 is confirmed by the dial gauge 74, and the dial gauge 74 is set to zero.

While the grinding wheel 12 and the first and second rotating wheels 17 and 18 are rotated at a predetermined rotation direction and a predetermined rotation speed, the grinding wheel distance adjusting mechanism 24 cuts the first and second rotating wheels 17. , 18 is gradually reduced, and the grinding wheel 12 is roughly cut to a thickness t of about 1 mm.
The thickness t of the grinding wheel 12 is confirmed by the dial gauge 74, and the dial gauge 74 is set to zero.

The distance adjusting mechanism 24 between the grindstones further cuts the gap K between the first and second rotating grindstones 17 and 18 little by little to finish the thickness t of the grinding grindstone 12 to 0.5 mm. . The thickness t of the grinding wheel 12 is measured with the dial gauge 74.
In order to confirm the thickness t of the grinding wheel 12, the first and second rotary grinding wheels 17 and 18 are separated from the grinding wheel 12 by the inter-grinding distance adjusting mechanism 24, and then the slide table 11 is moved in either the front or rear direction. The thickness of the actual grinding wheel 12 is measured by moving the carbon material provided on the mounting jig fixed on the slide table 11 with the grinding wheel 12 and measuring the groove width of the ground carbon material. t is calculated.

Furthermore, when it is desired to reduce the thickness t of the grinding wheel 12, the dial gauge 74 is set to zero and the same operation as described above is performed.
When the thickness t of the grinding wheel 12 is reduced, the height position of the grinding wheel 12 can be raised slightly by turning the vertical handle of the grinding machine to reduce the resistance during grinding (dressing).

The present invention is not limited to the above-described embodiments, and can be changed without departing from the gist of the present invention. For example, some or all of the above-described embodiments and modifications are included. The case where the grindstone dresser device of the present invention is configured in combination is also included in the scope of the present invention.
In the present embodiment, the advancing / retreating mechanism 21 includes the auxiliary distance adjusting mechanisms 22 and 23 and the inter-whetstone distance adjusting mechanism 24. However, the present invention is not limited to this, and the auxiliary distance adjusting mechanism and the inter-grinding stone distance are necessary. The adjustment mechanism can be omitted, and an advance / retreat mechanism of another structure can be provided.

Although the dial gauge 74 for measuring the distance between the first rotary grindstone 17 and the second rotary grindstone 18 is provided, the present invention is not limited to this, and the dial gauge is not provided if necessary. It is also possible to measure the distance (width of the grinding wheel) between the first rotating wheel and the second rotating wheel.
The feed screw shaft 35 is directly rotated by the feed handle 37. However, the present invention is not limited to this, and a speed reduction mechanism may be provided between the feed screw shaft and the feed handle as necessary.

Although cup-type grindstones are used as the first and second rotating grindstones 17 and 18, the present invention is not limited to this, and grindstones with other structures can be used as necessary.
Although the feed screw shaft 35 or the like is used as the inter-whetstone distance adjusting mechanism 24, the present invention is not limited to this, and another inter-whetstone distance adjusting mechanism can be used as necessary.
Although the bolts 44 and 45 are used as the auxiliary distance adjusting mechanisms 22 and 23, the present invention is not limited to this, and another auxiliary distance adjusting mechanism can be used as necessary.
Although the grinding wheel 12 is provided so as to be movable up and down, it can also be provided so as to be able to swing as necessary.

It is a perspective view of the grindstone dresser device concerning one embodiment of the present invention. It is a partially-omission perspective view of the grindstone dresser device. It is a top view of the grindstone dresser device. It is the perspective view seen from the back of the grindstone dresser device. It is explanatory drawing which shows the dressing state of the grindstone by the 1st, 2nd rotary grindstone of the grindstone dresser apparatus.

Explanation of symbols

10: Grinding wheel dresser device, 11: Slide table, 12: Grinding wheel, 13: First support frame, 14: Second support frame, 15: DC motor (first rotation drive source), 16: DC motor ( (Second rotational drive source), 17: first rotating grindstone, 18: second rotating grindstone, 19: first grindstone angle changing mechanism, 20: second grindstone angle changing mechanism, 21: advance / retreat mechanism, 22 , 23: auxiliary distance adjustment mechanism, 24: distance adjustment mechanism between grinding wheels, 25: base member, 26: bottom plate, 27, 28: side plate, 29, 30: lower guide rail, 31, 32: slide block, 33: first 34: second table, 35: feed screw shaft, 36: bearing block, 37: feed handle, 38, 39: upper guide rail, 40, 41: slide member, 42, 43: slide pushing bracket 44, 45: Bolt, 46, 47: Outer side surface, 48, 49: Rotating hole, 50, 51: Bottom plate, 52, 53: Bottom surface, 54, 55: Rotating shaft, 56, 57: Fixing bolt, 58, 59: Screw hole, 62: Mounting plate, 62a: Front surface, 63: Mounting plate, 63a: Side surface, 64, 65: Mounting portion, 66, 67: Cutting portion, 68: Bolt hole, 69, 70: Outer periphery Corner, 71, 72: Side, 73: Mounting bracket, 74: Dial gauge (scale), 75: Stem, 76: Mounting bracket, 77: Spindle, 78: Measuring element, 79: Gauge head

Claims (3)

A grindstone dresser device that performs shape processing on at least both sides of a grinding wheel mounted on a grinder,
The first and second rotations are arranged around the grinding wheel, are arranged to face each other with first and second support frames, and are driven to rotate by first and second rotational drive sources. Whetstone,
A first and second grindstone angle changing mechanism for rotating the first and second support frames to change the facing angle of the first and second grindstones;
Each of the first and second grinding wheel angle changing mechanisms is mounted, attached to a base member, moved in both directions of the grinding wheel, and the distance between the first and second rotating grinding wheels with respect to the grinding wheel is set. A grindstone dresser device comprising an advance / retreat mechanism for changing. 2. The grindstone dresser device according to claim 1, wherein the advance / retreat mechanism includes an auxiliary distance adjusting mechanism that independently adjusts an interval between the first and second rotating grindstones and the grinding grindstone, and the first and second rotating grindstones. A grindstone dresser device comprising: an inter-whetstone distance adjusting mechanism that moves toward and away from each other synchronously. The grindstone dresser device according to any one of claims 1 and 2, further comprising a scale for measuring a distance between the first rotating grindstone and the second rotating grindstone. apparatus.

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