JP6503126B1 - Rotary dresser - Google Patents

Abstract

An object of the present invention is to provide a rotary dresser capable of performing an operation of positioning a dressing tool with respect to a turning center in a short time.
A main rotary shaft member (30) rotatable about a rotary shaft (CL), a holding member (49) detachably mounted on one end face (30a) of the main rotary shaft member and rotating with the main rotary shaft member; A rotary dresser 10 comprising a dressing tool rotatably attached to a holding member, and an endless belt 55 for applying a rotational force to the dressing tool. The holding member has a mounting surface 40a in contact with the one end surface of the main rotary shaft member, the one end surface and the mounting surface are formed as a surface without a convex portion, and the lower end surface is a recess 32 and 33 are formed, and through holes 42 and 43 are formed in the mounting surface at positions corresponding to the concave portions, and fixing the main rotary shaft member and the holding member to the through holes and the concave portions Members 35 and 36 are inserted.
[Selected figure] Figure 2

Description

  The present invention relates to a rotary dresser for shaping the shape of a grinding wheel.

  Conventionally, in order to adjust the surface shape of a grinding wheel for grinding a workpiece, a rotary dresser for dressing the surface of the grinding wheel has been used. The rotary dresser is used, for example, to adjust the surface shape of a grinding wheel having an arc-like surface (as an example, a grinding wheel for grinding a round groove of an outer ring of a ball bearing which is a workpiece). A dressing tool is provided which contacts the surface to dress the surface in a predetermined arc.

  As a rotary dresser, a full-type dresser described in Patent Document 1 and a revolving dresser described in Patent Document 2 are known.

  The full-type dresser includes a grinding wheel shaft to which a grinding wheel is fixed and a dressing tool shaft parallel to the grinding wheel shaft. In the dressing process, the outer peripheral surface of the dressing tool fixed to the dressing tool shaft is opposed to the outer peripheral surface of the grinding stone fixed to the grinding wheel, and the dressing wheel and the dressing tool are rotated around their respective axes. It is done by pressing the tool against the grinding wheel. As a result, the outer peripheral surface of the grinding stone is adjusted to a shape corresponding to the outer peripheral surface of the dressing tool.

  As shown in FIG. 10A, the revolving dresser 100 has a cylindrical shape extending in the vertical direction, and on the lower end surface of the main rotary shaft member 130, which can reciprocate and rotate around the rotation axis CL. It has a pivot arm 140 attached and a tool holder 150 fixed to the pivot arm 140 and holding the dressing tool 120. At the center of the lower end face of the main rotary shaft member 130, a male portion 131 which is a protrusion for center alignment is formed, and on the mounting surface 142 of the swing arm 140 with respect to the main rotary shaft member 130, a male portion 131 and A female portion 141 which is a through hole to be fitted is formed. The swivel arm 140 is attached to the main rotary shaft member 131 by fitting the male portion 131 into the female portion 141 and screwing the periphery thereof with a fixing screw 136.

  The dressing tool 120 is rotatably held by the tool holder 150, and provided at the other end of the shaft member 122 serving as the rotation shaft, the dress head 124 provided at one end of the shaft member 122, and the other And the driven pulley 126. An endless belt 155 is wound around the pulley 126 in a state of being extended in the direction of the rotation axis CL. When the driving force is transmitted to the pulley 126 via the belt 155, as shown by the arrow in FIG. 10A, it rotates around a tool rotation axis orthogonal to the rotation axis CL of the main rotation shaft member 130. By reciprocating the main rotary shaft member 130 in this state, the dressing tool 120 is pivotally moved about the rotary shaft CL while dressing the surface of the grinding stone.

  In the full-type dresser, new dressing tools having different shapes are required each time according to the type and shape of the grinding wheel. On the other hand, in the turning type dresser 100 shown in FIG. 10A, grinding is performed with different shapes by changing the distance between the dress head 124 and the rotation axis CL of the main rotary shaft member 130 to change the turning locus of the dress head 124. The dressing wheel can be dressed with a single dressing tool 120.

  In recent years, the production of workpieces has been changed from low-volume, high-volume production to high-mix, low-volume production, and the demand for a swivel dresser that can dress various grinding wheels with the same dressing tool is increasing.

Japanese Patent Laid-Open No. 2002-103224 JP-A-4-244376

  In the turning dresser 100, when changing the turning locus of the dressing tool 120, position adjusting means comprising the turning arm 140 and the dovetail groove 144 and the dovetail 154 provided on the tool holder 150 make the dressing tool 120 and the rotational axis CL different. You need to change the distance.

  When adjusting the position of the dovetail 154 in the dovetail groove 144 with the pivot arm 140 and the tool holder 150 mounted on the main rotary shaft member 130, it is necessary to repeat the position adjustment repeatedly while checking the processing result Because of this, it takes a lot of time to position the dressing tool with respect to the rotation axis CL. Since such positioning operation during mass production operation causes a significant delay in the manufacturing process, as a remedy, a set of the pivot arm 140 and the tool holder 150 in which the dovetail groove 144 and the ant 154 are positioned is provided. A method is prepared in advance, and the dressing tool 120 is changed together with the swing arm 140.

  When replacing the dressing tool 120 together with the pivot arm 140 on the main rotary shaft member 130, as shown in FIG. 10 (b), the belt 155 wound around the pulley 126 of the dressing tool 120 is loosened, and then FIG. As shown in c), remove the fixing screw 136 and separate the entire attachment surface 141 of the pivot arm 140 downward from the lower end surface 131 of the main rotary shaft member 130 to fit the male portion 131 and the female portion 141 Then release the dress tool 120 together with the pivot arm 140. Next, another set of pre-prepared, positioned pivot arm 140, tool holder 150 and dressing tool 120 are attached to the main rotary shaft member 130. In the mounting operation, first, the female portion 141 of the pivoting arm 140 is fitted into the male portion 131 of the main pivoting shaft member 130, and in this state, the main pivoting shaft member 130 and the pivoting arm 140 are fixed by the fixing screw 136. Thereafter, the belt 155 is wound around the pulley 126, and the tension is adjusted so that the belt 155 is tensioned again.

  As described above, by replacing the dressing tool 120 with the pivot arm 140 using the fitting structure of the male part 131 and the female part 141, the working time for positioning the dressing tool 120 with respect to the rotation axis CL can be significantly shortened. Can.

  However, when the dressing tool 120 is to be replaced together with the swing arm 140, it is necessary to loosen or retighten the belt 155 each time, and after the replacement, the dressing tool 120 is made of Since the position is finely adjusted, a rotary dresser capable of further shortening the positioning operation of the dressing tool 120 has been required.

  The present invention has been made in view of the above problems, and an object thereof is a rotary capable of performing a positioning operation of the dressing tool with respect to the turning center in a short time when changing the distance from the turning center of the dressing tool. It is to provide a dresser.

  The invention according to claim 1 for achieving the above object is detachably mounted on a main rotary shaft member rotatable around a rotary shaft, and one end face of the main rotary shaft member in the rotary shaft direction, A holding member that rotates with the main rotary shaft member, a dressing tool rotatably attached to the holding member, and an endless belt for applying a rotational force to the dressing tool via a pulley connected to the dressing tool; In the rotary dresser, the holding member has a mounting portion having a mounting surface in contact with the one end surface of the main rotary shaft member, and the one end surface and the mounting surface have surfaces without convex portions. And one or more recesses are formed in the one end surface, and a through hole is formed in the mounting surface at a position corresponding to the recess, and the through hole of the mounting portion is formed. Recess on end face Wherein the inserted with a fixing member for fixing the holding member and the main rotary shaft member.

  According to this configuration, the main rotary shaft member and the holding member are replaced with the dressing tool, and the belt is loosened when changing the distance from the turning center of the dressing tool, that is, the distance from the rotary shaft of the main rotary shaft member. There is no need to replace it. That is, when removing the holding member from the main rotation shaft member, after removing the fixing member, the mounting surface of the holding member can be slid without significantly separating from the one end surface of the main rotation shaft member This allows the belt to be removed from the pulley without loosening. In addition, when attaching another holding member to the main rotary shaft member, wind the belt around the pulley in a state where the mounting surface of the holding member is in contact with one end surface of the main rotary shaft member without loosening the belt. The dressing tool can be positioned by inserting the fixing member into the recess of the main rotary shaft member and the through hole of the holding member and fixing these members. As a result, it is possible to save time and effort for adjusting the tension of the belt at the time of changing the dressing tool, and to perform the positioning operation of the dressing tool at the time of changing the distance from the turning center of the dressing tool in a short time.

  Further, in the rotary dresser according to the present invention, in the rotary dresser according to claim 1, the recess includes an axial recess formed in a portion where the rotation shaft is located, and the through hole corresponds to the axial recess. It is characterized by including an upper through hole.

  According to this configuration, by inserting and fixing the fixing member in the axial through hole and the axial recess, the positions of the rotary shafts of the main rotary shaft member and the holding member can be made to coincide with each other more reliably. Tool positioning accuracy can be improved.

  In the rotary dresser according to the second aspect of the present invention, the rotary dresser further comprises an eccentric collar rotatably fitted in the axial through hole, the fixing member in the hollow portion of the eccentric collar and the axial recess. It is characterized in that it comprises position adjustment means for changing the position of the dressing tool with respect to the rotation axis by rotating the eccentric collar in a state in which is inserted.

  According to this configuration, since the dressing tool can be continuously displaced with respect to the rotation axis with rotation of the eccentric collar, fine adjustment of the position of the dressing tool can be easily performed.

  According to the rotary dresser of the present invention, when changing the distance from the turning center of the dressing tool, the positioning operation of the dressing tool with respect to the turning center can be performed in a short time.

FIG. 1 is a perspective view of a rotary dresser according to a first embodiment of the present invention. The partial sectional view which expanded the principal part of the rotary dresser. The figure explaining the dressing operation | work of the grindstone for grinding by a dressing tool. The figure which looked at the principal part of the rotary dresser shown in FIG. 2 from the downward direction. The principal part side view of a rotary dresser. The figure explaining the process of removing the turning arm with which the dressing tool was mounted | worn from the main rotating shaft member. It is a figure which shows 2nd Embodiment of a rotary dresser, Comprising: (a) is a principal part expansion partial cross section similar to FIG. 2, (b) is a partial enlarged view of (a). FIG. 8 is a partial cross-sectional view of the dresser shown in FIG. (A) is a figure explaining the rotation state of eccentric collar, (b) is a graph which shows the change of the movement amount of the dressing tool accompanying rotation of eccentric collar. (A) is a principal part expansion partial cross section figure of the conventional rotary dresser. (B) is a figure explaining the state which loosened the belt in the rotary dresser shown to (a). (C) is a fragmentary sectional view which shows the state which removed the turning arm with which the dressing tool was mounted | worn from the main rotating shaft member.

First Embodiment
FIG. 1 is a perspective view of a rotary dresser according to a first embodiment of the present invention, and FIG. 2 is an enlarged partial cross-sectional view of the main part of the rotary dresser. In the rotary dresser 10 (hereinafter simply referred to as the "dresser 10") of the present embodiment, as shown in FIGS. It is a turning dresser which turns relative to the grinding stone 90, 90 '.

  The dresser 10 includes a fixing base 11, a support shaft 12 provided on the fixing base 11, a dresser arm 13 supported by the support shaft 12, and a holder 14 attached to a tip 13 a of the dresser arm 13. A first drive means 16 for applying power to the main rotary shaft member 30 via the main rotary shaft member 30 held by the holder 14, the lid type pulley 15A covering the upper surface of the holder 14, and the lid type pulley 15A; And Further, the dresser 10 includes a pivoting arm 40 attached to the lower end face 30a which is one end face of the main rotary shaft member 30 in the rotational axis direction, a holding member 40 comprising a tool holder 50 set to the pivoting arm 40, and a tool holder A dressing tool 20 held at 50 and driving means 18 for applying a rotational force to the dressing tool 20 are provided.

  The fixing base 11 is fixed to a pedestal (not shown). The support shaft 12 is formed in a cylindrical shape, and the axial direction is disposed parallel to the surface of the pedestal. A base end 13 b of the dresser arm 13 is rotatably supported around the axis of the support shaft 12 on the circumferential surface of the support shaft 12.

  A cylindrical holder 14 is integrally attached to the tip 13 a of the dresser arm 13. The cylinder axial direction of the holder 14 is orthogonal to the extending direction of the dresser arm 13. In the illustrated example, the cylindrical holder 14 extends in the vertical direction, and the lid pulley 15A covers the upper end side of the holder 14. On the side of the base end 13 b of the dresser arm 13, a pulley 15 B connected to a motor shaft (not shown) of the motor as the first drive means 16 is provided.

  As shown in FIG. 2, the main rotary shaft member 30 is rotatably held inside the holder 14 via a bearing 38. The pivot shaft member 30 of the present embodiment has a cylindrical shape extending in the vertical direction, and rotates around the central axis CL. The upper end of the main rotary shaft member 30 is attached to the lid-type pulley 15A through an unshown knurling (turning metal).

  An endless belt 17 is wound around the lid pulley 15A and the pulley 15B. When the first drive means 16 is operated, the lid pulley 15A is rotated via the pulley 15B and the belt 17. The main rotary shaft member 30 rotates around the central axis CL in conjunction with the rotation of the lid-type pulley 15. In the present embodiment, as indicated by double-headed arrows in FIG. 1, the main rotary shaft member 30 is reciprocally rotated around the central axis CL by the driving force of the first driving means 16.

  The pivot arm 40 is detachably mounted on the lower end surface 30 a of the main rotary shaft member 30 using screws (fixing members) 35 and 36. The lower end surface 30 a is formed as a surface without a convex portion, and has a plurality of concave portions 32 and 33. In the present embodiment, the on-axis recessed portion 32 which is a positioning recessed portion is formed on the central axis of the lower end surface 30a through which the central axis CL passes, and a plurality of recessed portions smaller in diameter than the on-axis recessed portion 32 A peripheral recess 33 is formed. In the present embodiment, the four peripheral recesses 33 are formed at equal intervals so as to surround the axial recess 32. However, the number of the recesses 32 and 33 is not limited to this, and at least one may be formed.

  The pivot arm 40 is an arm-like member extending in a direction orthogonal to the central axis CL in a state of being attached to the main rotary shaft member 30. The base end side of the swing arm 40 is formed in a plate shape, and constitutes a mounting portion for the main rotary shaft member 30, and a mounting surface 40a that abuts on the lower end surface 30a is formed on the mounting portion. The mounting surface 40 a is formed as a surface without a convex portion, and has a plurality of through holes 42 and 43 into which the screws 35 and 36 are inserted. The through holes 42 and 43 are formed at positions corresponding to the recesses 32 and 33 of the main rotary shaft member 30, and in the present embodiment, the on-axis through holes 42 corresponding to the on-axis recess 32 and a plurality of peripheral recesses A plurality of peripheral through holes 43 corresponding to 33 are formed.

  Further, as shown in FIG. 2, a recess is formed in the lower end surface 30 a of the main rotation shaft member 30 and the attachment surface 40 a of the swing arm 40, and the swing arm 40 with respect to the main rotation shaft member 30 is formed in this recess. The pin 39 is inserted to stop the relative rotation of the. The projection length from the lower end face 30a of the pin 39 is set to be short (that is, short enough that the belt 55 does not need to be loosened) so as not to affect attachment / removal of the pivot arm 40 to the main rotary shaft member 30. There is. The pin 39 is optional and may not be provided.

  The screws 35 and 36 are inserted into the axial recess 32 and the axial through hole 42, and the peripheral recess 33 and the peripheral through hole 43. The screws 35 and 36 are smaller in diameter than the positioning screw 35. And 36. In the screw-fastened state, the head 35 a of the positioning screw 35 protrudes from the axial through hole 42, and the head 36 a of the fixing screw 36 is accommodated in the peripheral through hole 43. In the present embodiment, as shown in FIG. 3, the pivoting arm 40 is fixed by the positioning screw 35 and four fixing screws 36 disposed so as to surround the positioning screw 35.

  As shown in FIG. 2, a tool holder 50 for rotatably holding the dressing tool 20 is mounted on the tip side of the pivoting arm 40. The tool holder 50 is formed with an anvil 54 to be engaged with an anvil groove 44 formed in the pivot arm 40, and is provided with an adjusting screw 56 for adjusting the position of the anvil 54 within the anvil groove 44 There is. FIG. 5 is a side view of the main part of the dresser 10, and is a view of a part of the main part shown in FIG. The tool holder 50 is fixed to the pivoting arm 40 by fastening fixing screws 57 for fixing the dovetail 54 in the state of fitting the dovetail 54 into the dovetail groove 44. In the clearance between the dovetail groove 44 and the ant 54, a thin plate-like jib 58 is inserted which fills the gap and eliminates the play of the dovetail groove 44.

  The dovetail groove 44 extends in a direction perpendicular to the central axis CL in a state in which the pivoting arm 40 is mounted on the main rotary shaft member 30, and the tool holder 50 in a state of being attached to the dresser 10. The groove 44 can be moved in a direction (direction of arrow X in FIG. 4) orthogonal to the central axis CL. The dovetail groove 44, the dovetail 54 and the fixing screw 57 for fixing these positions constitute position adjusting means for changing the distance d between the central axis CL and the dressing tool 20.

  The tool holder 50 rotatably holds the dressing tool 20 around a tool rotation axis RL orthogonal to the central axis CL of the main rotation shaft member 30 in a state of being mounted on the dresser 10, as shown in FIG. The dressing tool 20 has a cylindrical shaft member 22 and a dressing head 24 provided at one end of the shaft member 22 and having a disk-like dress portion 24a. Further, the other end side of the shaft member 22 is connected and fixed to the pulley 26. The pulley 26 is rotatably supported by the tool holder 50 with the center of the circle coinciding with the tool rotation axis RL of the shaft member 22. The dress head 24 is provided such that the circular center thereof coincides with the central axis of the shaft member 22 (ie, the tool rotation axis RL). A plurality of diamond grains, which are dress members, are attached to the circular outer peripheral edge of the dress portion 24 a of the dress head 24.

  The second drive means 18 applies a rotational force to the dressing tool 20, and in this embodiment is a motor, and a pulley 19 is connected to the end of the motor shaft. An endless belt 55 is wound around the pulley 19 and the pulley 26 of the dressing tool 24 in the direction of the central axis CL, and when the pulley 19 rotates as the motor rotates, the belt 55 is interposed. The pulley 26 then rotates, and the dressing tool 24 coupled to the pulley 26 rotates about the tool rotation axis RL.

  In the dresser 10 described above, when the first drive means 16 and the second drive means 18 are operated, as shown by double-headed arrows in FIGS. 2 and 4, the main rotational shaft member 30 reciprocates around the central axis CL. The dressing tool 20 is moved back and forth around the central axis CL, and the dressing tool 20 is further rotated about the tool rotation axis RL. As a result, as shown in FIG. 3 (a), the dresser 10 dress while making circular arc-shaped surface of the grinding stone 90 reciprocate. Also, by changing the distance d of the dress head 24 from the central axis CL (see FIG. 4), as shown in FIG. 3 (b), grinding with different sizes (size of R) of the arc shape of the surface The grinding stone 90 'can be appropriately dressed.

  Next, in the above-described dresser 10, the procedure for changing the setting of the distance d with respect to the central axis CL of the dressing tool 20 will be described by replacing the dressing tool 20 with the pivot arm 40 with respect to the main rotary shaft member 30. . As described above, the setting change of the distance d is performed when the pivot arm 40, the tool holder 50 and the dressing tool 20 are attached to the main rotary shaft member 30, the dovetail groove 44 of the pivot arm 40 and the dovetail 54 of the tool holder 50. However, it is necessary to repeat the adjustment of position many times while checking the processing result (that is, the processing result of the workpiece shape processed by the grinding wheel after dressing). It takes it. Therefore, a set of the swing arm 40, the tool holder 50, and the dressing tool 20 for which the distance d has been set is prepared in advance at a stage different from the mass production process. Do.

  First, as shown in FIG. 6A, the positioning screw 35 and the peripheral screw 36 are loosened and removed, and the swing arm 40 on which the dressing tool 20 and the tool holder 50 are mounted is removed from the main rotary shaft member 30. At this time, the tip end side of the pivot arm 40 is slightly inclined toward the inside of the belt 55, and the belt 40 is removed from the pulley 26 so that the pivot 40a is largely separated from the lower end surface 30a without loosening the belt 55. Therefore, the pivoting arm 40 can be slid relative to the main rotation shaft member 30.

  Next, another set of the dressing tool 20, the tool holder 50 and the pivot arm 40 prepared in advance is attached to the main rotary shaft member 30. The installation work is performed in the reverse order of the removal work. That is, without loosening the belt 55, the belt 55 is wound around the pulley 26 in a state where the mounting surface 40a is in contact with the lower end surface 30a, and then the concave portions 32, 33 of the main rotary shaft member 30 and the swing arm 40 Screws 35 and 36 are inserted into and fastened to the through holes 42 and 43 to fix these members.

  As described above, since the dresser 10 of the present embodiment can save time and effort for adjusting the tension of the belt 55 when changing the dressing tool 20, as in the conventional dresser 100 shown in FIG. The positioning operation of the dressing tool 20 can be performed in a short time as compared with the case where the belt 155 is loosened or retensioned. Further, by fixing the respective members in a state in which the positioning screw 35 is inserted in the axial through hole 43 and the axial recess 32, the positions of the rotation shafts of the main rotary shaft member 30 and the pivot arm 40 can be matched more reliably. As a result, the positioning accuracy of the dressing tool 20 can be enhanced.

Second Embodiment
Next, the position adjustment structure of the second embodiment of the present invention will be described with reference to FIGS. 7 to 9. In addition, in each figure, the same code | symbol is attached | subjected to the element similar to 1st Embodiment mentioned above, and the description is abbreviate | omitted.

  In the dresser 10 of the present embodiment, an eccentric collar 80 provided in the axial through hole 42 of the pivoting arm 40, which is a holding member 49, for adjusting the distance d between the central axis CL and the dressing tool 20. And a collar fixing screw 85 for fixing the rotational position of the eccentric collar 80. The configuration other than the position adjustment unit is the same as that described in the first embodiment, and thus the description thereof is omitted here. The position adjustment means of the present embodiment can be suitably used when finely adjusting the position of the dressing tool 20 after replacing the dressing tool 20 together with the swing arm 40.

  As shown in FIGS. 7 and 8, the eccentric collar 80 has a cylindrical main body 82 and a flange 83 integrally formed at one end of the main body 82. In the installed state, the main body portion 82 is rotatably fitted in the axial through hole 42, and a spring washer 88 is interposed between the flange portion 83 and the lower surface of the swing arm 40. The positioning screw 35 is attached to the main rotation shaft member 30 in a state of being inserted into the hollow portion of the eccentric collar 80.

  As shown in FIG. 9A, the main body 82 has a shift between the axis C of the outer diameter and the axis of the inner diameter, and the thickness changes in the circumferential direction, and the axis of the inner diameter is in the installed state It coincides with the stop axis CL of the main rotary shaft member 30. FIG. 9A is a view showing the rotational state of the eccentric collar 80, and shows the positional relationship between the eccentric collar 80 and the positioning pin 39 in the installed state, and the positioning pin 39 and the eccentric collar 80 are shown. The position at which the distance from the inner diameter axis is farthest is the position P1, and the positions rotated 60, 120 and 180 degrees clockwise from the position P1 are the positions P2, P3 and P4, respectively.

  Next, a method of adjusting the position of the dressing tool 20 using the eccentric collar 80 and the collar fixing screw 85 will be described.

  First, in the dresser 10 shown in FIG. 7A, the fixing screw 36 for fixing the turning arm 40 is loosened, and the collar fixing screw 85 is loosened, so that the turning arm 40 can be displaced relative to the main rotary shaft member 30 Put in a good condition. In this state, the eccentric collar 80 is rotated to position the dressing tool 20. Thereafter, the collar fixing screw 85 is fastened to fix the rotational position of the eccentric collar 80, and the screws 35 and 36 are fastened to fix the swing arm 40 and the main rotary shaft member 30.

  FIG. 9 (b) is a graph showing the change of the moving amount of the dressing tool 20 with the rotation of the eccentric collar 80. The rotational positions P1, P2, P3 and P4 of the eccentric collar 80 in FIG. 9A indicate the positions of 0 degree, 60 degrees, 120 degrees and 180 degrees in FIG. 11B, respectively. Since the amount of movement linearly changes between the position P2 and the position P3, it is preferable to use this region for position adjustment.

  In the position adjusting means of the present embodiment, since the dressing tool 20 can be continuously displaced as the eccentric collar 80 rotates, fine adjustment of the dressing tool 20 can be easily performed. For example, in the position adjusting means for moving the dovetail 54 of the dovetail groove 44 with the adjusting screw 56 shown in the first embodiment, since the adjusting screw 56 has play, the back of the adjusting screw 56 during normal rotation and reverse rotation Although a rush occurs and the fine adjustment becomes difficult, the position adjustment means of this embodiment can continuously change the position of the dressing tool 20 without causing a backlash by rotating the eccentric collar 80. Fine adjustment of the position can be easily performed.

  In addition, since the spring washer 88 interposed between the position adjustment jig 60 and the eccentric collar 80 can prevent the formation of a perfect gap between the members when the collar fixing screw 85 is loosened, Stability of position adjustment can be secured.

  The present invention is not limited to the above-described embodiment and modifications, and various modifications can be made without departing from the scope of the invention. For example, the rotary dresser 10 is a position adjusting means constituted by the eccentric collar 80 described in the second embodiment together with the position adjusting means constituted by the dovetail groove 44 and the ant 54 shown in the first embodiment. May be provided.

DESCRIPTION OF SYMBOLS 10 Rotary dresser 13 Dresser arm 14 Holder 15A Lid type pulley 15B Pulley 16 1st drive means 17 Belt 18 2nd drive means 19 Pulley 20 Dress tool 24 Dress head 26 Pulley 30 Main rotating shaft member 30a Tip end face (one end face)
32 Recess on shaft (recess)
33 Peripheral recess (concave)
35 Positioning screw (fixing member)
36 Fixing screw (fixing member)
40 Swivel arm (holding member)
40a Mounting surface 42 Axial through hole (through hole)
43 Peripheral through hole (through hole)
50 Tool holder (holding member)
55 belt 80 eccentric color CL central axis (rotational axis)

Claims (3)

A main rotary shaft member rotatable about a rotary shaft;
A holding member which is detachably attached to one end face of the main rotary shaft member in the direction of the rotary shaft, and which rotates together with the main rotary shaft member;
A dressing tool rotatably mounted on the holding member;
An endless belt for applying a rotational force to the dressing tool via a pulley connected to the dressing tool;
The holding member has a mounting portion having a mounting surface in contact with the one end surface of the main rotary shaft member,
The one end surface and the mounting surface are formed as a surface without a convex portion, one or more concave portions are formed in the one end surface, and the mounting portion is penetrated at a position corresponding to the concave portion of the mounting surface Through holes are formed,
A rotary dresser comprising: a fixing member which is inserted into the through hole of the mounting portion and the concave portion of the one end surface to fix the main rotary shaft member and the holding member. The recess includes an axial recess formed at a portion where the rotation shaft is located,
The rotary dresser according to claim 1, wherein the through hole includes an axial through hole corresponding to the axial recess. An eccentric collar rotatably fitted in the axial through hole;
The position adjusting means is provided to change the position of the dressing tool with respect to the rotation shaft by rotating the eccentric collar in a state where the fixing member is inserted into the hollow portion of the eccentric collar and the axial recess The rotary dresser according to claim 2, characterized in that

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