JP4864575B2 - Centerless grinding machine - Google Patents

Description

  The present invention includes a grinding wheel and an adjustment wheel disposed so that outer peripheral surfaces thereof face each other, and a centerless structure configured to grind a workpiece introduced between the grinding wheel and the adjustment wheel by the grinding wheel. More specifically, the present invention relates to a centerless grinding machine that can position the adjustment wheel with respect to the grinding wheel with high accuracy.

  Conventionally, a centerless grinding machine capable of positioning the adjustment wheel with respect to the grinding wheel with high accuracy is disclosed in Japanese Utility Model Publication No. 3-103149.

  The centerless grinding machine includes a bed, a grinding wheel and an adjustment wheel disposed so that outer peripheral surfaces face each other, a grinding wheel base fixed to one end of the bed and rotatably supporting the grinding wheel, A slide base fixed to the other end of the bed, an adjustment wheel provided on the slide base and rotatably supporting the adjustment wheel, and a grinding wheel, fixed on the adjustment wheel between the adjustment wheel, A blade that supports the workpiece introduced between the adjusting wheels, a drive device that moves the adjusting wheel base back and forth with respect to the grinding wheel head, and a control device that controls the operation of the drive device.

  The centerless grinding machine is provided with a position detection magnetic scale in the vicinity of the adjusting axle, and a detector is provided so as to be movable along the magnetic scale. The base end portion of the connected connecting rod is rotatably attached. The detector directly detects the relative position of the adjusting carriage with respect to the grinding wheel head as an absolute value, and the controller controls the operation of the drive device so that the detected relative position becomes a predetermined value. Then, the position of the adjusting carriage relative to the grinding wheel head is positioned.

Japanese Utility Model Publication No. 3-103149

  By the way, in the centerless grinding machine, the slide base is fixed on the bed as described above, and the adjustment base is provided so as to be movable only in the advancing and retreating direction with respect to the grinding wheel base. Some are provided so as to be able to swivel within a horizontal plane on the bed.

  In such a centerless grinding machine, the angle between the grinding wheel axis and the adjusting axle can be adjusted by adjusting the turning angle of the slide base.

  However, in the position detection mechanism in the conventional centerless grinding machine, the magnetic scale is attached to the adjustment carriage, while the detector is connected to a connecting rod attached to the grinding wheel base, so that the slide base is swung. In the centerless grinding machine configured as described above, if the position detection mechanism having such a configuration is adopted, the perpendicularity of the magnetic scale with respect to the grinding wheel axis cannot be maintained due to the turning movement of the slide base, and the adjustment wheel base of the grinding wheel base can be maintained. The relative position cannot be detected accurately. For this reason, the position of the adjusting carriage relative to the grinding wheel head cannot be accurately determined. Further, when the turning angle is large, the scale and the detector may be damaged.

  The present invention has been made in view of the above circumstances, and even in a centerless grinding machine configured to turn a slide base, it is possible to accurately detect the relative position between a grinding wheel head and an adjustment carriage. The purpose is to provide a centerless grinding machine equipped with a position detection mechanism.

To achieve the above object, the present invention provides:
Bed and
A grinding wheel and an adjustment wheel arranged so that the outer peripheral surfaces face each other;
A grinding wheel platform fixed to one end on the bed and supporting the grinding wheel rotatably about a horizontal axis;
A swivel base disposed on the other end side of the bed and provided so as to be capable of swiveling in a horizontal plane on the bed around a position near the grinding wheel carriage;
An adjustment chassis that is disposed on the swivel base and is movable in a direction that moves forward and backward with respect to the grinding wheel chassis, and that supports the adjustment wheel rotatably about a horizontal axis center or an axis center inclined with respect to a horizontal plane. When,
A blade fixed on the adjustment carriage between the grinding wheel and the adjustment wheel, and supporting a workpiece introduced between the grinding wheel and the adjustment wheel;
A drive mechanism for moving the adjustment chassis in the forward / backward direction;
A turning angle adjusting mechanism for turning the swivel base;
A centerless grinding machine comprising at least a control device for controlling the operation of the drive mechanism,
A scale fixed to the grinding wheel platform so as to be along a horizontal axis perpendicular to the rotation center axis of the grinding wheel;
A reader which is provided in the vicinity of the scale so as to be movable along the scale and reads the scale of the scale;
A connecting rod disposed in parallel with the scale and having one end connected to the reader;
A first connecting member connected to the other side of the connecting rod so as to be movable in a direction perpendicular to the scale in a horizontal plane;
A second connection in which one end is pivotally supported by the first connection member and is provided so as to be rotatable relative to the first connection member in a horizontal plane, and the other end is fixed to the adjustment chassis. With a member,
The control device controls the operation of the drive mechanism based on the scale position data read by the reader, and controls the movement position of the adjustment chassis in the forward / backward direction. Concerning.

  According to the centerless grinding machine according to the present invention having the above-described configuration, when the adjustment carriage moves in the forward / backward direction with respect to the grinding wheel carriage on the swivel base, the forward / backward direction is perpendicular to the rotation center axis of the grinding wheel. When the swivel base is in a normal state, the reader is moved along the scale by the connection relation of the second connecting member, the first connecting member, and the connecting rod without moving the first connecting member. The position (scale) on the scale, that is, the position of the adjustment carriage relative to the grinding wheel carriage is read by the reader.

  On the other hand, when the swivel base is turned from the reference state and the advancing / retreating direction of the adjusting wheel is not orthogonal to the rotation center axis of the grinding wheel, the adjusting wheel is moved forward / backward with respect to the grinding wheel wheel. When moving in the direction, the first connecting member moves in the horizontal direction perpendicular to the scale (that is, the direction along the rotation center axis of the grinding wheel) according to the movement of the second connecting member that moves together with the direction, This movement absorbs the movement component of the adjustment chassis in the same direction.

  The first connecting member also moves in the direction along the scale together with the connecting rod (that is, the horizontal direction orthogonal to the rotation center axis of the grinding wheel), and the movement component in the same direction of the adjustment carriage by these movements. Is absorbed. Therefore, the reader receives only the moving component of the adjustment carriage in the horizontal direction orthogonal to the rotation center axis of the grinding wheel and moves in the same direction, and the position (scale) on the scale, that is, the grinding wheel carriage by this reader. The position of the adjustment chassis in the horizontal direction perpendicular to the rotation center axis is read.

  Thus, the control device controls the movement position of the adjustment carriage in the advancing and retreating direction by controlling the operation of the drive mechanism so that the position on the scale read by the reader becomes a predetermined position, thereby Therefore, the position of the adjusting carriage in the horizontal direction (direction along the scale) orthogonal to the rotation center axis of the grinding wheel carriage can be accurately determined.

  Further, by calculating the difference value between the positions before and after the movement, it is possible to calculate the amount of movement of the adjusting carriage in the horizontal direction perpendicular to the rotation center axis of the grinding wheel carriage.

The centerless grinding machine according to the present invention further includes:
The amount of movement of the adjustment chassis in the forward / backward direction is calculated, and the amount of movement of the adjustment chassis in the direction along the scale is calculated based on the scale position data read by the reader. A turning angle calculation unit may be provided that calculates a turning angle of the swivel base with respect to a horizontal axis orthogonal to the rotation center axis of the grinding wheel based on the amount of movement of the adjustment wheel base in each direction.

According to the centerless grinding machine, the swivel angle calculating section, the movement amount [Delta] L ₂ in the moving direction of the adjusting chassis is calculated, in the direction along the scale (horizontal direction perpendicular to the rotational axis of the grinding wheel chassis) A movement amount ΔL ₁ of the adjustment carriage is calculated, and based on the calculated movement amounts ΔL ₁ and ΔL ₂ , the swivel angle θ of the swivel base with respect to a horizontal axis orthogonal to the rotation center axis of the grinding wheel is, for example, Is calculated using the following equation.
θ = cos ⁻¹ (ΔL ₁ / ΔL ₂ )

  Then, by calculating the actual swivel angle of the swivel base in this way, it is possible to confirm whether or not the swivel base is swiveling to the planned swivel angle.

  As described above, according to the centerless grinding machine according to the present invention, even if the adjustment carriage is provided so as to be able to turn on the bed, the adjustment with the grinding wheel carriage in the horizontal direction orthogonal to the rotation center axis of the grinding wheel carriage. The relative positional relationship with the chassis can be accurately detected, and the position of the adjustment chassis with respect to the grinding wheel chassis can be accurately determined.

  In addition, by calculating the actual swivel angle of the swivel base, it is possible to confirm whether or not the swivel base is swiveling to the planned swivel angle. And high-precision grinding can be performed.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a centerless grinding machine according to an embodiment of the present invention, and FIG. 2 is a front view thereof.

  As shown in FIGS. 1 and 2, the centerless grinding machine 1 of this example includes a bed 2, a grinding wheel 4 and an adjustment wheel 9 that are arranged so that their outer peripheral surfaces face each other, and one end on the bed 2. A grinding wheel carriage 3 that is fixed to the side and supports the grinding wheel 4 so as to be rotatable about a horizontal axis, a swivel base 5 provided on the other end of the bed 2, and a swivel base 5. An adjustment wheel base 6 that is provided so as to be movable in a direction that advances and retreats with respect to the grinding wheel wheel base 3 and that supports the adjustment wheel 9 so as to be rotatable about a horizontal axis center or an axis center inclined with respect to a horizontal plane, The blade 13 that is fixed on the adjusting wheel 6 between the cars 9 and supports the workpiece W introduced between the grinding wheel 4 and the adjusting wheel 9, and the relative position between the grinding wheel wheel 3 and the adjusting wheel 6. A position detection mechanism 20 for detecting, and a drive mechanism for moving the adjustment chassis 6 in the forward / backward direction Provided with not shown), the turning angle adjusting mechanism 40 for pivotal movement of the swivel base 5, a control device for controlling the operation of at least the driving mechanism (not shown) and a (not shown).

  The adjustment chassis 6 engages with a pair of slides 10 disposed on the swivel platform 5, and a lower adjustment chassis 8 that is movable along the slide 10 in a direction that moves forward and backward with respect to the grinding wheel chassis 3; Similarly, a pair of guide rails 11 disposed on the lower adjustment chassis 8 are engaged, and the upper adjustment chassis 7 is movable along the guide rails 11 in a direction of moving forward and backward with respect to the grinding wheel chassis 3. Become.

  A blade 13 is fixed on the grinding wheel carriage 3 side on the lower adjustment carriage 8, and the adjustment wheel 9 is rotatably supported by the upper adjustment carriage 7. The upper adjustment chassis 7 and the lower adjustment chassis 8 are each driven by the drive mechanism (not shown) to move in the forward / backward direction, whereby the distance between the grinding wheel 4 and the adjustment wheel 9 is adjusted. The position of 13 is adjusted.

  The blade 13 is fixed on the lower adjustment chassis 8 via the holder 12. Further, the grinding wheel 4 and the adjustment wheel 9 are respectively rotated and driven in the direction of the arrow by a driving motor as appropriate.

  The drive mechanism (not shown) includes a first drive mechanism that drives the upper adjustment chassis 7 and a second drive mechanism that drives the lower adjustment chassis 8, each of which is a known servo motor. , Ball screw and ball nut. Each servomotor is provided with a rotary encoder, and the control device (not shown) receives the detection data of each rotary encoder, and the upper adjustment chassis 7 and the lower adjustment chassis 8 in the advance / retreat direction. The position is recognized, and the position of the upper adjustment chassis 7 is controlled by feedback control of the first drive mechanism based on the recognized position data. For the lower adjustment chassis 8, a control device (not shown) receives position data detected by the position detector 20, and feedback controls the second drive mechanism to control the position of the lower adjustment chassis 8. To do.

  The swivel base 5 is provided so as to be pivotable within a horizontal plane on the bed 2 around a central axis 14 of the pivot mechanism by a pivot mechanism (not shown) provided in the vicinity of the grinding wheel carriage 3. It is driven by the turning angle adjusting mechanism 40 to turn. The turning angle adjusting mechanism 40 is configured so that, for example, the bracket 41 standing on the bed 2, the adjusting bolt 42 inserted through the bolt hole of the bracket 41, and the adjusting bolt 42 do not move in the axial direction. And a pair of holding rings 43, 44 held by the bracket 41, and spherical washers 45, 46 provided between the holding rings 43, 44 and the bracket 41, respectively. The adjustment bolt 42 is screwed into a screw hole provided on the side surface of the swivel base 5. By rotating the adjustment bolt 42 in the screwing direction, the swivel base 5 pivots in a direction approaching the bracket 41 side. By rotating the adjustment bolt 42 in the reverse direction, the adjustment bolt 42 turns in a direction away from the bracket 41.

  The swivel base 5 is appropriately clamped on the bed 2 by a clamping device, and is swung by being driven by the turning angle adjusting mechanism 40 in this clamped state or in an unclamped state.

  The position detection mechanism 20 includes a mounting plate 21 fixed to the side surface of the grinding wheel carriage base 3 so as to be parallel to a vertical plane orthogonal to the rotation center axis of the grinding wheel 4, and the mounting plate 21. A scale 22 fixed horizontally, a guide rail 23 fixed to the mounting plate 21 so as to be parallel to the lower side of the scale 22, and a guide rail 23 engaged with the guide rail 23 and moved along the guide rail 23 A pair of sliders 24, a mounting plate 25 fixed to the slider 24, a reader 26 fixed to the mounting plate 25, and a link mechanism 27.

  The reader 26 reads a scale formed on the scale 22 and detects the position by reading the scale.

  As shown in FIGS. 3 and 4, the link mechanism 27 has a first connecting rod made of a material having a low coefficient of thermal expansion, one end of which is fixed to the mounting plate 25 so as to be parallel to the scale 22. 28, a second connecting rod 29 fixed to the other end portion of the first connecting rod 28 so as to extend at a right angle from the side surface thereof toward the lower adjustment chassis 8, and the second connecting rod 29 A guide rail 30 fixed on the side surface of the connecting rod 29 opposite to the grinding wheel 4 in parallel with the central axis of rotation of the grinding wheel 4, and a slider 31 that engages with the guide rail 30 and moves along the guide rail 30. A bracket (first connecting member) 32 having a C-shaped vertical cross section fixed to the slider 31 and one end of the bracket 32 between the opposing pieces by a pin 34, and the other end of the bracket 32. The arm member (second contact) fixed to the side surface of the lower adjustment chassis 8 Consisting of members) 33.

  The pin 34 is inserted into a bearing 35 provided on the arm member 33, and the bracket 32 and the arm member 33 are relatively rotatable in a horizontal plane around the pin 34.

  Thus, in the position detection mechanism 20, the scale 22, the guide rail 23, and the first connecting rod 28 are horizontally disposed so as to be orthogonal to the rotation center axis of the grinding wheel 4, respectively. The mounting plate 25, the reader 26, the first connecting rod 28, the second connecting rod 29, and the guide rail 30 move in the horizontal direction orthogonal to the rotation center axis of the grinding wheel 4. Moreover, the guide rail 30 is arrange | positioned along the horizontal direction parallel to the rotation central axis of the grinding wheel 4, and the slider 31 and the bracket 32 move to the same direction.

  The control device (not shown) receives the position data of the scale 22 read by the reader 26, controls the operation of the drive mechanism (not shown) based on this, and controls the lower unit. The movement position of the adjustment chassis 8 in the advance / retreat direction is controlled.

  In the centerless grinding machine 1 of the present example having the above-described configuration, the first driving mechanism and the second driving mechanism are driven under the control of the control device (not shown), and the grinding wheel 4 is moved. Then, the lower adjustment carriage 8 and the upper adjustment carriage 7 are moved so that the blade 13 and the adjustment wheel 9 are in a predetermined position, and then the workpiece W is introduced between the grinding wheel 4 and the adjustment wheel 9. This is processed (see FIG. 5).

  At that time, as described above, the control device (not shown) receives the detection data of the rotary encoder of the first drive mechanism, recognizes the position of the upper adjustment chassis 7 in the advancing / retreating direction, and the recognized position. Based on the data, the first drive mechanism is feedback-controlled to control the position of the upper adjustment chassis 7, and the lower adjustment chassis 8 receives position data detected by the position detector 20, and receives the second drive. The mechanism is feedback controlled to control the position of the lower adjustment chassis 8.

  When the swivel base 5 is in the reference state, that is, in a state where the advancing / retreating direction of the lower adjustment carriage 8 is orthogonal to the rotation center axis of the grinding wheel 4, the slider 31 and the bracket 32 are placed on the rotation center axis of the grinding wheel 4 The reader 26 moves on the guide rail 23 along the scale 22 by the connection relation with the link mechanism 27 without moving in the direction along the direction, and the position (scale) on the scale 22 by the reader 26. That is, the relative position of the lower adjustment chassis 8 (adjustment chassis 6) with respect to the grinding wheel chassis 4 is read.

  The control device (not shown) feedback-controls the second drive mechanism on the basis of the relative position between the grinding wheel chassis 4 and the lower adjustment chassis 8 (adjustment chassis 6) read by the reader 26. The adjustment chassis 8 is moved and positioned to a predetermined position.

On the other hand, as shown in FIG. 6, when the swivel base 5 pivots from the reference state by an angle θ and the advancing / retreating direction of the lower adjustment carriage 8 becomes non-orthogonal with the rotation center axis of the grinding wheel 4, the bracket 32 Moves together with the slider 31 on the guide rail 30 in the horizontal direction perpendicular to the scale 22 (that is, the direction along the central axis of rotation of the grinding wheel 4), and this movement causes the movement component (ΔL _a in the same direction of the arm member 33). ) Is absorbed (see FIG. 7).

The bracket 32 also moves in the direction along the scale 22 together with the first connecting rod 28 and the second connecting rod 29 (that is, the horizontal direction orthogonal to the rotation center axis of the grinding wheel 4), and these movements. Thus, the moving component (ΔL _b ) in the same direction of the arm member 33 is absorbed (see FIG. 7). In FIGS. 6 and 7, the state rotated by the angle θ is indicated by a two-dot chain line.

  In this state, when the lower adjustment carriage 8 moves in the forward / backward direction with respect to the grinding wheel carriage 3, the bracket 32 moves on the guide rail 30 along with the slider 31 in the same manner as described above. The movement component in the same direction of the lower adjustment chassis 8 is absorbed by this movement, and the bracket 32 along the scale 22 together with the first connection rod 28 and the second connection rod 29. The movement component in the direction of the lower adjustment chassis 8 is absorbed by this movement.

  Therefore, the reader 26 receives only the moving component of the lower adjustment carriage 8 in the horizontal direction orthogonal to the rotation center axis of the grinding wheel 4 and moves in the same direction, and the position on the scale 22 (by the reader 26 ( The scale), that is, the position relative to the grinding wheel carriage 3, and the relative position between the grinding wheel carriage 4 and the lower adjustment carriage 8 (adjustment carriage 6) in the horizontal direction orthogonal to the rotation center axis of the grinding wheel 4 is read.

  Thus, the control device (not shown) feedback-controls the second drive mechanism based on the relative position between the grinding wheel chassis 4 and the lower adjustment chassis 8 (adjustment chassis 6) read by the reader 26. Then, the lower adjustment chassis 8 is moved and positioned to a predetermined position.

  Thus, according to the centerless grinding machine 1 of this example, the grinding wheel chassis 3 in the horizontal direction orthogonal to the rotation center axis of the grinding wheel 4 is provided even if the adjustment chassis 6 is provided to be able to turn on the bed 2. Since the relative positional relationship between the wheel and the adjusting carriage 6 can be accurately detected, the relative position of the adjusting wheel 9 with respect to the grinding wheel 4 can be accurately determined, and high-precision grinding is performed. Can do.

Moreover, the said control apparatus (not shown) is provided with the turning angle calculation part 50, as shown to Fig.8 (a). The turning angle calculation unit 50 calculates a movement amount ΔL ₂ of the lower adjustment chassis 8 in the advance / retreat direction based on detection data of a rotary encoder 51 attached to a servo motor constituting the second drive mechanism. , based on the data read by the reader 26, and calculates the amount of movement [Delta] L ₁ in the direction along the scale 22 of the lower adjustment chassis 8, it calculates both the movement amount [Delta] L 1 _and, based on [Delta] L _2, e.g. The swivel angle θ of the swivel base 5 is calculated by the following equation (see FIG. 8B).
θ = cos ⁻¹ (ΔL ₁ / ΔL ₂ )

  Thus, by calculating the actual turning angle θ of the swivel base 5 in this way, it is possible to confirm whether or not the swivel base 5 is turning to the planned turning angle. The turning can be set with high accuracy. Then, by setting the swivel base 5 to turn with high accuracy, high-precision grinding can be performed.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all. For example, the link mechanism 27 may be the link mechanism 60 having the configuration shown in FIGS. 9 and 10. The link mechanism 60 is provided with a backlash-less universal joint 61 instead of the bracket 32 and the pin 34 in the link mechanism 27. The first member 62 is fixed to the slider 31, and the second mechanism 62 is provided. The member 63 is fixed to the arm member 33. This link mechanism 60 also has the same effect as the link mechanism 27 in the above example.

  In the above example, the adjustment chassis 6 is composed of two movable platforms, the upper adjustment chassis 7 and the lower adjustment chassis 8. However, the present invention is not limited to this, and this is composed of one movable platform. Also good.

  As described above, the present invention can provide a suitable centerless grinding machine capable of accurately positioning the relative position between the grinding wheel base and the adjustment carriage base even if the swivel base is provided.

It is the top view which showed the centerless grinding machine which concerns on one Embodiment of this invention. It is a front view of the centerless grinder shown in FIG. It is a top view of the link mechanism which concerns on this embodiment. It is a front view of the link mechanism which concerns on this embodiment. It is explanatory drawing for demonstrating operation | movement of the centerless grinding machine which concerns on this embodiment. It is a top view which shows the state which turned the swivel base of the centerless grinding machine which concerns on this embodiment. It is a top view which shows the link mechanism of the state which swirled the swivel base. (A) is the block diagram which showed a part of structure of the control apparatus which concerns on this embodiment, (b) is explanatory drawing for demonstrating the effect | action. It is the top view which showed the link mechanism which concerns on the other form of this invention. FIG. 10 is a front view of the link mechanism shown in FIG. 9.

Explanation of symbols

1 Centerless grinding machine
2 beds
3 Wheel head
4 grinding wheel
5 Swivel stand
6 Adjustment chassis
7 upper adjustment chassis
8 bottom adjustment chassis
9 Adjustment car
20 Position detection mechanism
22 scale
26 Reader
27 Link mechanism
28 First connecting rod
29 Second connecting rod
32 Bracket (first connecting member)
33 Arm member (second connecting member)
40 Turning angle adjustment mechanism

Claims (2)

Bed and
A grinding wheel and an adjustment wheel arranged so that the outer peripheral surfaces face each other;
A grinding wheel platform fixed to one end on the bed and supporting the grinding wheel rotatably about a horizontal axis;
A swivel base disposed on the other end side of the bed and provided so as to be capable of swiveling in a horizontal plane on the bed around a position near the grinding wheel carriage;
An adjustment chassis that is disposed on the swivel base and is movable in a direction that moves forward and backward with respect to the grinding wheel chassis, and that supports the adjustment wheel rotatably about a horizontal axis center or an axis center inclined with respect to a horizontal plane. When,
A blade fixed on the adjustment carriage between the grinding wheel and the adjustment wheel, and supporting a workpiece introduced between the grinding wheel and the adjustment wheel;
A drive mechanism for moving the adjustment chassis in the forward / backward direction;
A turning angle adjusting mechanism for turning the swivel base;
A centerless grinding machine comprising at least a control device for controlling the operation of the drive mechanism,
A scale fixed to the grinding wheel platform so as to be along a horizontal axis perpendicular to the rotation center axis of the grinding wheel;
A reader which is provided in the vicinity of the scale so as to be movable along the scale and reads the scale of the scale;
A connecting rod disposed in parallel with the scale and having one end connected to the reader;
A first connecting member connected to the other side of the connecting rod so as to be movable in a direction perpendicular to the scale in a horizontal plane;
A second connection in which one end is pivotally supported by the first connection member and is provided so as to be rotatable relative to the first connection member in a horizontal plane, and the other end is fixed to the adjustment chassis. With a member,
The control device is configured to control an operation of the drive mechanism based on position data of a scale read by a reader to control a movement position of the adjustment chassis in the forward / backward direction. A centerless grinding machine.   The amount of movement of the adjustment chassis in the forward / backward direction is calculated, and the amount of movement of the adjustment chassis in the direction along the scale is calculated based on the scale position data read by the reader. And further comprising a turning angle calculation unit for calculating a turning angle of the swivel base with reference to a horizontal axis orthogonal to the rotation center axis of the grinding wheel based on the amount of movement of the adjusting wheel base in each direction. The centerless grinding machine according to claim 1, wherein

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