JPH06262503A - Stone polishing machine - Google Patents

Abstract

PURPOSE:To provide a stone polishing machine capable of polishing the surface of the small step of a stone even if a grinding wheel is worn unevenly. CONSTITUTION:A stone W is placed on a work table 30 with the front side w1 of the stone faced upward. When a vertical cylinder 15 raises the work table 30 upward, the stone W is pressed against a second beam 62 and a first beam 54 for positioning. Also the first beam 54 is moved vertically to adjust the inclination angle of the stone W. Grinding wheels 89 to be rotated drivingly by a spindle motor 79 are moved drivingly along the small step W2 of the stone W. Eight grinding wheels 89 ranging from coarse grain to fine grain are set in order. When the grinding wheels 89 are worn, and their peripheral parts are not made in contact with surface of the small step W2, the fixed angle of the stone W can be adjusted by tilting it so that the grinding wheels 89 are made in contact with it satisfactorily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stone polishing machine.

[0002]

2. Description of the Related Art Conventionally, a stone material formed into a plate shape so as to be attached to a wall surface has been widely used for surface decoration of a wall surface of a building. As shown in FIG. 8, there is a decorative stone material 91 having a cutout portion called “small step” formed on one side of its front side. This is to form a groove for decoration between the adjoining stone materials 91 on the wall surface to be decorated.

By the way, in manufacturing the stone material 91, the front side of the stone material 91 is polished and finished.
However, the front side 91b of the stone 91 other than the small steps 91a was easily polished by the conventional automatic polishing machine.
It was the current situation that a skilled person manually performs the front side 91c using a small portable polishing machine. That is,
As shown in FIG. 8, the grindstone 92 of the portable grinder is polished so that its rotation axis 93 is perpendicular to the front side 91b.

[0004]

However, the small stage 9
When the lapping work of 1a is performed, as shown in FIG.
The polishing surface 92a of No. 1 was rapidly reduced toward the outer peripheral side. Therefore, in manufacturing the decorative stone material 91, the small steps 9
Polishing of the front side 1a of 1a must be done manually by a skilled worker, which causes a problem of high production cost.

Further, when polishing is carried out by using a small-sized portable polishing machine, it is necessary to prepare a plurality of grinding stones having different grain sizes and carry the polishing machine to carry out the work, resulting in poor productivity.

The present invention has been made to solve the above problems, and an object thereof is to provide a stone polishing machine capable of automatically and easily polishing the surface of a small step portion of stone. .

Another object of the present invention is to provide a stone polishing machine capable of polishing and finishing the surface of a small step portion of stone at one time. Another object of the present invention is to provide a stone polishing machine capable of polishing the surface of a small step portion of stone even if the grindstone wears unevenly.

[0008]

In order to solve the above problems, the present invention provides a grindstone which is arranged at a position where it can be ground with its axis of rotation perpendicular to the step surface formed on one side of the stone. The gist of the invention is to provide a rotating means for rotationally driving the grindstone and a moving means for relatively moving the stone material and the grindstone along one side on which a small step of the stone material is formed.

The gist is that a plurality of grindstones having different grain sizes are arranged in the order of grain size. Further, the gist of the invention is to provide an angle setting means for setting an arbitrary angle between the polishing surface of the grindstone and the surface of the small step.

[0010]

Therefore, according to the present invention, the whetstone is rotationally driven by the rotating means, and the whetstone and the stone material are relatively moved along the side where the step is formed by the moving means, so that the stone surface of the stone material is continuously polished. To be done.

Further, a plurality of grindstones having different grain sizes are rotationally driven by the rotating means, and the whetstone and the stone material arranged in order of grain size are relatively moved by the moving means in order from the grindstone having coarse grain size. Then, the small step surface of the stone material is continuously polished by a grindstone having a coarse grain size to a fine grindstone.

Further, the angle formed by the surface of the small stage and the polishing surface of the grindstone is arbitrarily set by the angle setting means. Therefore, even if the outer peripheral portion of the polishing surface of the grindstone is worn, the angle between the grindstone and the step surface can be changed and used.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stone polishing machine as an embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, for convenience of description, the front side of the plane of FIG. 1 is the front side, the right side of the plane is right, and the left side of the plane is left.

FIG. 1 is a schematic front view showing a stone polishing machine 1, in which a feed male screw member 3 is vertically fixed to an upper surface of a base 2. A female screw (not shown) is screwed onto the upper portion of each feed male screw member 3. A sprocket 4 is fixed to the lower end of each female screw coaxially with the feed male screw member 3. At the top of the sprocket 4,
The hub 5 is rotatably attached to the female screw via a thrust bearing. On the top of each hub 5,
The intermediate frame 6 is fixed. The middle frame 6
A feed motor 9 is fixedly mounted on the lower surface of the sprocket, and a plurality of sprockets 8 corresponding to the sprockets 4 are fixed to the rotation shaft of the motor 9. Each sprocket 4 is provided with a roller chain 7 on the sprocket 8. Therefore, when the feed motor 9 rotates, each sprocket 4 rotates via the roller chain 7. Since each hub 5 simultaneously moves up and down the feed male screw member 3, the intermediate frame 6 moves vertically in a horizontal state.

Further, as shown in FIG. 2, a first positioner shaft 10 is vertically fixed on the upper surface of the base 2 between the feed male screw members 3 positioned in the front-rear direction. A first positioner outer cylinder 11 is fitted on each of the first positioner shafts 10 so as to be vertically slidable. The upper surface of the first positioner outer cylinder 11 is fixed to the lower surface of the intermediate frame 6. When the feed motor 9 rotates and the intermediate frame 6 moves up and down, the first positioner outer cylinder 11 slides along the first positioner shaft 10. The first positioner shaft 10 and the first positioner outer cylinder 11 are configured to regulate the horizontal relative movement of the base 2 and the intermediate frame 6 fixed to each other.

On the upper surface of the intermediate frame 6, as shown in FIG. 1, a plurality of support bases 12 which are long in the front-rear direction are arranged in a row in the left-right direction. A plurality of rollers 14 are supported on the upper surface of each support 12 so as to be rotatable in the front-rear direction via receiving fittings 13.

Further, on the upper surface of the intermediate frame 6, upper and lower cylinders 15 as angle setting means are arranged at front and rear positions inside the support bases 12 arranged on the left and right outer sides, respectively. As shown in FIG. 7, a tip fitting 16 is supported at the center of the upper end of the piston rod 15a of each upper and lower cylinder 15 by a shaft 17 so as to be rotatable only in the front-rear direction. An aggregate 18 that is long in the front-rear direction is connected between the upper surfaces of the front metal fittings 16 located in the front-rear direction.

Similarly, as shown in FIG. 7, the upper and lower cylinders 15 located at the front and rear on the upper surface of the intermediate frame 6.
A pair of second positioner shafts 19 are fixed to the inside of the. A second positioner outer cylinder 20 is fitted on each of the second positioner shafts 19 so as to be vertically slidable. As shown in FIG. 4, a collar 20 a is formed at the upper end of the second positioner outer cylinder 20. A hole 20b is formed in the outer peripheral portion of the collar 20a.
Further, in the center of the upper surface of the second positioner outer cylinder 20, the shaft 2
0c is projected. On the shaft 20c, a tray 21 having a spherical recess 21a formed on its upper surface is mounted. Further, on the upper portion of the tray 21, a tray 22 having a spherical convex portion 22a that fits into the concave portion 21a is provided.
It is pivotally attached to c. The shaft 2 is provided at the center of the tray 22.
A hole 22b to be inserted into the hole 0c is formed, and the vertical cross section 22d of the hole 22b is spherical. Further, a brim 22c is formed at the upper end of the tray 22 so as to project in the horizontal direction. This brim 22c
A stay bolt 23 extending downward is fixedly provided on the. Each stay bolt 23 penetrates the hole 20b. A plurality of disc springs 24 are fitted and fixed by nuts 25 to the portion of the stay bolt 23 located below the brim 20a. Further, the tray 22 is fixed to the lower surface of the aggregate 18 at the upper surface thereof. Therefore, the receiving tray 22 swings on the receiving tray 21 about the shaft 20c. When the piston rod 15a of the upper and lower cylinders 15 is expanded and contracted, the aggregate 18 is moved up and down, and the horizontal movement is restricted by the positioner shaft 19 and the positioner outer cylinder 20.

As shown in FIG. 7, between the front ends of the left and right aggregates 18, a frame 26a having a "U" -shaped side cross section is connected. Further, between the rear ends of the aggregate 18, a frame body 26b having a lateral cross section formed in a "U" shape is connected. Inside the frames 26a and 26b, a reinforcing material 27 that connects the two is provided in parallel with the aggregate 18 and at a position not overlapping the roller 14. Further, the frame bodies 26a, 26
Frame bodies 28 having a "U" -shaped cross section are connected between the left and right ends of b. In addition, the aggregate 18, the reinforcing material 27,
On the upper surfaces of the frame bodies 26 a, 26 b and the frame body 28, the frame body 26
A top plate 29 having a size up to the end of a, 26b, 28 is attached. In the top plate 29, holes 29a through which the rollers 14 arranged below can penetrate in the vertical direction are formed correspondingly. In this embodiment, the aggregate 1
8, frame 26a, 26b, 28, auxiliary material 27 and top plate 2
9 constitutes a work table 30 as an angle setting means. A plate-shaped stone material W is placed on the upper surface of the work table 30. When the piston rod 15a of the upper and lower cylinders 15 contracts to the maximum, the roller 14 is exposed through the hole 29a. The stone W can be easily moved above the top plate 29 by the roller 14. This stone material W has a front surface W1 whose upper surface is polished,
The front side of the rear end is cut out to form a small step W2.

The front ends of the grooves of the left and right frame bodies 28 are shown in FIGS.
As shown in, the bracket 31 is fixed. A feed female screw 32, which is long in the front and rear direction, is rotatably supported by the bracket 31 via a thrust bearing (not shown). A chain sprocket 33 is fixed to the front end of the female feed screw 32. Left and right chain sprockets 3
The three parts are connected by a roller chain 34. Further, a handle 35 is attached to the front end of the left feed female screw 32.

Further, long rods 36 are screwed to the rear ends of the left and right feed female screws 32, respectively. Each rod 36 is supported by a bracket 37 fixed to the rear portion of the groove of the frame body 28 so as to be slidable forward and backward.
Further, a cross section “inverted L
A "" shaped stop beam 38 is connected. Therefore, when the handle 35 is rotated, the left and right feed female screws 32 are synchronously rotated via the roller chain 34. Then, since the left and right rods 36 move in the front-rear direction, the stop beam 38 moves in the front-rear direction. As a result, the stone material W placed on the work table 30 comes into contact with the stop beam 38 so that the position in the front-rear direction is set.

As shown in FIGS. 1 and 2, legs 39 are provided upright on the left and right sides of the base 2, respectively. Further, a beam 40 is connected between the upper ends of the legs 39 located at the front and rear, respectively. As shown in FIG.
A slide shoe 41 extending rearward from a front end of each of the left and right beams 40 is fixedly installed. A rack 42 is provided at the center of the upper surface of the slide shoe 41 for the length of the slide shoe 41. A rectangular slide box 43 is slidably attached to the slide shoe 41.

As shown in FIG. 6, the left and right slide boxes 43 are respectively provided with pinion gear shafts 44 which are inserted in the left and right directions. A pinion gear 4 for engaging with the rack 42 is provided at the center of the pinion gear shaft 44.
4a are formed respectively. Each pinion gear shaft 44
Chain sprockets 45 are fixed to the outer ends of the respective. Further, on the upper surfaces of the left and right slide boxes 43, box-shaped guide boxes 46 each having an open inner side are fixed. A synchro shaft 48 extending in the left-right direction is supported via bearings 47 on the outer surfaces of the left and right guide boxes 46. The synchro axis 4
Chain sprockets 49 are fixedly attached to both side portions of No. 8. The right end of the synchronizing shaft 48 is a connecting portion 48a to which a handle (not shown) can be attached.
And, between these both chain sprockets 45 and 49,
The roller chain 50 is connected.

A feed male screw member 51 arranged vertically is rotatably attached to the upper surfaces of the left and right guide boxes 46. The feed male screw member 51 is provided so as to project downward from the upper surface of the guide box 46, and a bevel gear 52 is fixed to the upper end thereof. Further, the feed male screw member 51 is screwed into the female screw 53 inside the guide box 46. The female screw 53 is fixed to the upper surface of a first beam 54 serving as an angle setting means having a rectangular side cross section with a hollow inside. The first beam 54 extends in the left-right direction from the guide box 46 and penetrates the synchro shaft 48 inside. Further, a contact plate 55 having a lower cross section formed in an arc shape in the front-rear direction is fixed to the lower surface of the first beam 54.

Bearings 56 are fixed to the upper surfaces of the left and right guide boxes 46, respectively. A cross shaft 57 is rotatably supported between the two bearings 56. The cross shaft 57 has a pair of left and right bevel gears 58.
Is stuck. Each bevel gear 58 is screwed onto the bevel gear 52. Further, a handle 59 is fixed to the right end of the cross shaft 57.

Therefore, when the handle is attached to the fitting portion 48a and rotated, the left and right guide boxes 46 are moved to the beam 4
The first beam 54 moves back and forth because it moves back and forth on the zero plane. Further, when the handle 59 is rotated, the first beam 54 moves up and down in the guide box 46 via the cross shaft 57 as shown by an arrow in FIG.

Further, as shown in FIG.
Above, on the rear side of the slide shoe 41, bearings 60 each having a side cross section formed in a “convex” shape are fixed. Swing shafts 61 are rotatably supported on the left and right bearings 60, respectively. Both swing shafts 6
As shown in FIG. 5, a second beam 62 serving as an angle setting means having a quadrangular side cross section is fixed between the upper ends of the shafts 1 along the same axis 61. A contact plate 63 is fixed to the lower surface of the second beam 62. Bars 64 extending forward and backward are fixed to the lower surfaces of the left and right ends of the second beam 62. As shown in FIG. 5, at the front end of the bar 64,
A bolt 65 inserted vertically is screwed. The tip 65a of the bolt 65 is formed in a conical shape. The tip portion 65a comes into contact with a hole 66a formed in a conical shape at the tip of a bolt receiving base 66 fixed to the beam 40. The bolt receiving base 66 is fixed on the beam 40. Also, at the rear end of the bar 64,
A stay 67 having a lower end fixed to the beam 40 is inserted in a loosely fitted state. Then, a spring 69 is provided between the bar 64 of the stay 67 and the beam 40 via a pair of collars 68.
Is provided.

Therefore, the second beam 62 has the swing axis 6
It is rotatably supported around 1 in the direction shown by the arrow in FIG. 5 against the reaction force of the spring 69. Work table 3
When the stone W is placed on the upper surface of 0 and the upper and lower cylinders 15 are operated, the front side W1 of the stone W contacts the lower surfaces of the contact plate 63 of the second beam 62 and the contact plate 55 of the first beam 54, respectively. Up to the work table 30. At this time, as shown in FIG. 7, the position of the first beam 54 is raised so that the position of the lower surface of the contact plate 55 is higher than the position of the lower surface of the contact plate 63. Then, the work table 30 rises until the stone W rotates in the direction of the arrow around the axis of the swing shaft 61 and comes into contact with the contact plates 55 and 63 in an inclined state. On this occasion,
The stone material W is in line contact with the contact plate 55 having an arcuate side cross section. Further, since the second beam 62 rotates following the inclination of the stone W, the contact plate 63 contacts the entire lower surface. In this way, by adjusting the height position of the first beam 54, the work table 30 can hold the stone W inclining backward at an arbitrary angle.

As shown in FIG. 2, a sub-rail 70 is connected between the rear ends of the left and right beams 40. A guide rail 71 that extends in the left-right direction is fixed to the front surface of the upper portion of the sub-rail 70. A groove 71a is formed on the front surface of the guide rail 71. Guide bars 72 are arranged on the upper and lower surfaces of the guide rail 71 in the left-right direction. Rollers 73 are arranged above and below the groove 71a so as to roll in the groove 71a. In addition, each guide bar 72 has a roller 7
4 is arranged so as to roll on the guide bar 72.
The rollers 73 and 74 are fixed to a carrier box 75 arranged so as to cover the guide rail 71 from the front surface. At the rear end position of the upper surface of the guide rail 71,
A rack gear 76 is fixed in the left-right direction. A pinion gear (not shown) is screwed into the rack gear 76 with its rotation axis being vertical. The pinion gear is fixed to a rotary shaft of a traveling motor 77 as a moving unit fixed to the carrier box 75. Therefore, the carrier box 75 is supported by the guide rail 71 so as to be movable left and right, and is moved left and right when the traveling motor 77 rotates.

As shown in FIG. 3, the carrier box 75
Three motor bases 78 each having an L-shaped side cross section are arranged in the left-right direction on the upper surface of the. On the front surface of the motor base 78, a spindle motor 79 as a rotating means is fixedly mounted with its rotation axis vertical. A spindle motor pulley 80 is fixed to the rotary shaft of each spindle motor 79.

On the front surface of the carrier box 75, spindle quill boxes 81 provided in the up-down direction are arranged in a row in the left-right direction. A spindle quill 82 is vertically slidably attached to each spindle quill box 81. And
Air cylinders 83 are attached to the side surfaces of each spindle quill box 81 in the vertical direction. A piston rod 84 extends downward from each air cylinder 83, and its tip is connected to the side surface of the spindle quill 82. Therefore, when the air cylinder 83 extends the piston rod 84, the spindle quill 82 descends. Further, a spindle 85 is rotatably attached to each spindle quill 82. A pulley 86 is fixed to the upper end of each main shaft 85. Each pulley 86 is connected to the spindle motor pulley 80 by a belt 87. Further, each belt 87 is provided with a tension roller 88 fixed to the upper surface of the carrier box 75.

Further, grindstones 89 having different grain sizes are replaceably fixed to the lower ends of the respective main shafts 85. Whetstone 89
Are arranged so that the particle size becomes finer in the order from left to right. In the present embodiment, the spindle quill box 81, the spindle quill 82, the air cylinder 83, the pulley 86, the grindstone 89 and the like constitute a spindle unit 90 as a rotating means. Each spindle unit 90 is provided with a proximity sensor (not shown) that detects the stone material W.

When the spindle motor 79 rotates, the grindstone 89 of each spindle unit 90 rotates. Further, when the carrier box 75 moves and the proximity sensor of each spindle unit 90 detects the stone material W, the spindle quill 82 descends to move the grindstone 89 downward, and when passing the stone material W, the grindstone 89 moves upward. It has become. Further, since the grindstone 89 of each spindle unit 90 is set to have a finer grain size in order, the polishing work can be completed by moving the carriage box 75 once over the stone W.

The stone polishing machine 1 is connected to a control panel (not shown). The control panel includes the feed motor 9,
An operation switch for operating the traveling motor 77 and the spindle motor 79 is provided. Also, the upper and lower cylinders 15
Further, in order to operate the air cylinder 83, an operation switch for opening and closing a valve (not shown) for supplying air is provided.

The operation of the stone polishing machine 1 configured as described above will be described. First, in a state in which the upper and lower cylinders 15 are not operated and the piston rod 15a is not extended, the work table 30 is at a low position, so the upper portion of the roller 14 is exposed on the work table 30 from the hole 29a of the top plate 29. In this state, the stone W on the work table 30
Place the stone W on the roller 1 with the front side W1 facing up.
4 so that the end surface of the stone W on the small step W2 side abuts the stop beam 38. And the whetstone 89
The front and rear position of the stop beam 38 is adjusted according to the width of the small step W2 of the stone material W to be polished so that the polished surface of the step W2 contacts the surface of the small step W2. Further, a handle is attached to the fitting portion 48a and the synchronizing shaft 48 is rotated to move the first beam 54
Is moved to an appropriate position at the front end according to the front-back width of the stone W.

Next, the feed motor 9 is operated to raise the intermediate frame 6, and the front side W1 of the stone material W is moved to the second beam 62.
The vertical position is adjusted so as to be an appropriate position on the lower surface of the contact plate 63. Then, when the upper and lower cylinders 15 are operated, the work table 30 rises with respect to the intermediate frame 6, and the rollers 14 descend from the top plate 29 of the work table 30. Therefore, the stone material W is supported on the work table 30. At this time, since the first positioner outer cylinder 11 slides on the first positioner shaft 10 only in the vertical direction, horizontal rattle does not occur in the intermediate table 6.
Next, when the upper and lower cylinders 15 are operated, the work table 30 on which the stone material W is placed rises, and the front side W1 on the rear end side of the stone material W contacts the lower surface of the contact plate 63. Also, stone material W
The front side W1 on the front end side is a contact plate 55 of the first beam 54.
Abut the lower surface of. Therefore, the rise of the work table 30 is restricted, and the position of the stone material W is fixed and supported while being pressed against the contact plates 55 and 63. At this time, the second positioner outer cylinder 20 moves the second positioner shaft 19
Since it slides only in the vertical direction, horizontal rattling does not occur on the work table 30.

Next, with the carrier box 75 in the right side original position of the guide rail 71, each spindle motor 79 is operated to rotate the grindstone 89. When the traveling motor 77 is operated, the carrier box 75 moves to the left on the guide rail 71. Each spindle unit 90 is a stone W
When approaching the upper part of the small stage W2, the proximity sensor provided for each detects the stone material W. Based on this signal, the air cylinders 83 of the respective spindle units 90 are sequentially operated and the grindstone 8
Lower 9 Each whetstone 89 contacts the front side of the small step W2 portion of the stone W to continuously polish the surface. Since the carrier box 75 moves, the surface of the small step W2 is gradually polished from the rough grindstone 89 to the fine grindstone 89 for finishing step by step.

When the carrier box 75 passes the stone W and the grindstone 89 of the right spindle unit 90 leaves the small step W2, the traveling motor 77 is stopped and the carrier box 75
Stops moving. Next, the traveling motor 77 is reversed to return the carrier box 75 to the right original position.
Then, the polished state of the surface of the small stage W2 is visually inspected.
At this time, if the grindstone 89 hits the surface of the small step W2 well, the uneven polishing does not occur. When the outer peripheral side of the grindstone 89 is worn, the portion of the small stage W2 from the front side W1 is not well polished and uneven polishing occurs.

In this case, the handle 59 is turned to rotate the vertical feed synchronizing shaft 57 to raise the first beam 54 by an appropriate amount. Then, since there is no force to push down the front end side of the stone material W from above, the upper and lower cylinders 15 move to the work table 3
Push up 0 further. Therefore, the front end of the stone W is
The front side W1 moves upward so as to keep contacting the contact plate 55. Since the lower surface of the contact plate 55 is formed in an arcuate shape in the front-rear direction, the contact plate 55 always presses the front side W1 of the stone W with a line in the left-right direction. At this time,
The rear end of the stone W is pressed against the contact plate 63 of the second beam 62 from below. Therefore, since the second beam 62 rotates rearward against the reaction force of the spring 69 as the stone W inclines rearward, the entire lower surface of the contact plate 63 continues to contact the stone W. That is, the stone material W abuts against the contact plates 55 and 63 and is positionally fixed in an inclined state.
Therefore, even if the stone W is tilted, the vertical position of the small step W2 does not move significantly, so that the mechanism for changing and adjusting the vertical position of the grindstone 89 is unnecessary.

Next, the spindle motor 79 is operated again to rotate the grindstone 89, and the traveling motor 77 is operated to move the carrier box 75. Then, each grindstone 89 moves on the small step W2 in a state where the rotation axis of the main spindle unit 90 is inclined forward with respect to the front side W1 of the stone W. That is,
Polishing is performed with the outer peripheral side of the grindstone 89 closer to the small step W2. Therefore, the polishing of the portion of the small stage W2 from the front side W1 is performed more strongly. After finishing the polishing, the polishing surface of the small stage W2 is inspected again. As a result, if there is uneven polishing, the inclination angle of the stone W is adjusted in the same manner, and the above polishing is repeated. The polishing work is finished when the unevenness of polishing is eliminated.

As described in detail above, according to the stone material polishing machine 1 of this embodiment, the grindstones 89 having different grain sizes are sequentially arranged in the carrier box 75. Each grindstone 89 is rotationally driven by a spindle motor 79. Then, the carrier box 75 is moved on the guide rail 71 provided along the small step W2 of the stone W. Therefore, the small step W2 of the stone W can be easily polished.

The work table 3 on which the stone W is placed
The tilt angle of 0 is arbitrarily adjusted with respect to the rotation axis of the grindstone 89. Therefore, even when the grindstone 89 is worn,
It is possible to perform polishing without causing uneven polishing on the small steps W2 of the stone material W.

Since the stone W can be polished with the front side W1 thereof facing upward, the polished state can be easily inspected visually. Further, the work table 30 or the intermediate table 6 on which the stone material W is placed is restricted by the second positioner shaft 19 and the first positioner shaft 10 to be movable only in the vertical direction. Rattling is less likely to occur. Therefore, highly accurate polishing work can be performed.

Even if the surface of the small step W2 is formed to be inclined with respect to the front side W1, the polishing can be performed efficiently. The present invention is not limited to the above-described embodiments, and may be configured as follows, for example, within the scope of the invention.

(1) In the above embodiment, the spindle unit 9
Although 0 is moved with respect to the stone material W, the stone material W may be moved with respect to the main spindle unit 90. (2) Although eight grindstones 89 having different grain sizes are provided in the above embodiment, any number of grindstones 89 may be provided.

(3) In the above embodiment, the spindle unit 90 is mechanically moved by moving the carrier box 75 by the traveling motor 77, but it may be moved by a person.

[0047]

As described above in detail, according to the present invention, there is an excellent effect that the surface of the step portion of the stone material can be automatically and easily polished.

Further, there is an excellent effect that the surface of the stone step portion can be polished and finished at one time.
Further, the surface of the small step portion of the stone material can be polished even if the grindstone is unevenly worn.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a stone polishing machine as one embodiment of the present invention.

FIG. 2 is a schematic side view of a stone polishing machine.

FIG. 3 is a schematic plan view of a stone polishing machine.

FIG. 4 is a side view showing a cross section of a part of a second positioner shaft and a positioner outer cylinder.

FIG. 5 is a side sectional view of a second beam portion.

FIG. 6 is a front cross-sectional view of a first beam and a guide box.

FIG. 7 is an explanatory diagram showing a state where the work table is inclined.

FIG. 8 is a perspective view showing a state in which a grindstone is applied to a small step of a stone material of a conventional example.

FIG. 9 is a partial cross-sectional view showing a state where the outer circumference of the grindstone is worn.

[Explanation of symbols]

15 ... Vertical cylinder as angle setting means, 30 ... Work table as angle setting means, 54 ... First beam as angle setting means, 62 ... Second beam as angle setting means, 71 ... As moving means Guide rails, 7
7 ... Traveling motor as moving means, 79 ... Spindle motor as rotating means, 87 ... Whetstone, 90 ... Spindle unit as rotating means, W ... Stone material, W2 ... Small stage.

Claims (3)

[Claims] 1. A small step (W) formed on one side of a stone (W).
2) A grindstone (87) arranged at a position where the axis of rotation is perpendicular to the surface and capable of polishing, a rotating means (79) for rotationally driving the grindstone (87), the stone (W) and the grindstone (87) and a moving means (71, 77) for relatively moving the small step (W2) of the stone (W) along one side formed therein. 2. A stone polishing machine according to claim 1, wherein a plurality of grindstones (87) having different grain sizes are arranged in the order of grain size. 3. An angle setting means (15, 3) for setting an arbitrary angle between the polishing surface of the grindstone (87) and the surface of the small step (W2).
0,54,62) is provided, The stone polishing machine of Claim 1 or Claim 2 characterized by the above-mentioned.