Furniture plate surface grooving device and method

Abstract

The invention relates to the technical field of plate grooving, in particular to a furniture plate surface grooving device which comprises a rack, a back plate is arranged on the back face of the top of the rack, first sliding rails are arranged on the edges of the two sides, with the back plate as the center, of the top of the rack and perpendicularly intersect with the back plate, and a portal frame is arranged between the first sliding rails. At least one first sliding rail is a first electric sliding rail, a sliding block is slidably arranged on the horizontal part of the portal frame, a mounting frame is arranged on the sliding block, the rod-shaped part of the mounting frame slidably penetrates through the mounting frame, a grooving device is mounted on the lower portion of the mounting frame, a grooving drill bit is connected to an output shaft of the grooving device, and the grooving drill bit is used for grooving the surface of a plate body. A second electric sliding rail is installed on the back plate, a connecting plate is arranged on a sliding block of the second electric sliding rail in a sliding mode, and the connecting plate is connected with the sliding block. Through cooperation of the first electric sliding rail and the second electric sliding rail, precise positioning in the X-axis direction and the Y-axis direction is achieved, and bidirectional precise movement of the grooving device on the surface of the plate body is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of plate grooving, and in particular to a device and method for grooving the surface of a furniture plate. Background Art

[0002] In the field of furniture manufacturing, grooving the surface of boards is a common processing step, which is used to achieve splicing, decoration or functional expansion between boards.

[0003] Existing grooving equipment usually uses manual marking to cut grooves, which is inefficient and has poor accuracy. It can only cut grooves horizontally or vertically, and its function is relatively simple. In addition, existing fixtures are mostly designed for regular plates, and the fixing effect on non-standard plates is poor. They are easy to shift during processing, resulting in inaccurate grooving. Furthermore, existing grooving equipment lacks dust prevention equipment, and the debris generated during the grooving process flies around, not only affecting the operator's vision, but also potentially endangering the health of workers.

[0004] Based on this, it is necessary to design a high-precision, multifunctional, low-cost plate grooving device to improve processing efficiency and finished product quality. Summary of the Invention

[0005] The technical solution is as follows: A device for grooving the surface of a furniture board, comprising a frame, a backboard being provided on the back of the top of the frame, first slide rails being provided on both side edges of the top of the frame centered on the backboard, the first slide rails being perpendicularly intersected with the backboard, a gantry being provided between the first slide rails, at least one first slide rail being a first electric slide rail, a slider being slidably provided on the horizontal part of the gantry, a mounting frame being provided on the slider, a rod-shaped part of the mounting frame slidingly passing through the slider, a groover being installed at the lower part of the mounting frame, a groover drill being connected to the output shaft of the groover, the groover drill being used for grooving the surface of the board body, a second electric slide rail being installed on the backboard, a connecting plate being slidably provided on the slider of the second electric slide rail, and the connecting plate being connected to the slider.

[0006] Optionally, guide bars are provided on the opposite sides of the two first electric slide rails, a first limit plate is slidably provided between the two guide bars, an adjusting screw and a guide rod are provided parallel to the back of the first limit plate, wherein the adjusting screw is rotatably connected to the first limit plate, and the adjusting screw thread passes through the back plate, the guide rod slides through the back plate, and two second limit plates perpendicular to the first limit plate are slidably provided on the first limit plate, and the second limit plate is parallel to the first electric slide rail.

[0007] Optionally, cylinders are evenly spaced apart on at least one second limiting plate, piston rods of the cylinders abut against side walls of the plate body, and the cylinders are connected to an air pump disposed on the frame via an air pipe.

[0008] Optionally, a connecting sleeve is installed at the bottom of the slotter, the slotting drill bit passes through the center of the connecting sleeve, a conical cylinder is slidably provided on the inner wall of the connecting sleeve, the conical cylinder is used to abut against the surface of the plate body, and a second spring is provided between the top of the conical cylinder and the upper part of the connecting sleeve.

[0009] Optionally, a vacuum cleaner is installed on the back of the back plate, and a dust suction pipe is provided between the vacuum cleaner and the conical cylinder.

[0010] Optionally, a third electric slide rail is installed on both outer walls of the frame vertically adjacent to the back plate, and an N-shaped frame is connected for damping rotation between the sliders of the third electric slide rail. A grinder is provided on the N-shaped frame for damping sliding, and the grinder is used to grind the grooves opened on the surface of the plate body.

[0011] Optionally, a first spring is provided between the upper portion of the mounting bracket and the slider, and the first spring is used to drive the mounting bracket and the slotter mounted on the mounting bracket to reset.

[0012] Optionally, a fill light is installed at the lower part of the mounting frame, and the fill light is arranged on the side of the slotter.

[0013] Optionally, scales parallel to the first electric slide rail are provided on both sides of the top of the rack.

[0014] A method for grooving the surface of furniture panels using the above-mentioned grooving device: 1. Plate fixing: The plate body is placed between the first and second limit plates, with the right angle of the plate body overlapping the right angles of the first and second limit plates. Then, the adjusting screw is rotated to drive the first limit plate to move along the guide sleeve to the specified position. The other second limit plate is slid and abutted against the side wall of the plate body. The air pump is started to press the cylinder piston rod against the plate. 2. Slotting operation: Start the slotter and vacuum cleaner, press down the mounting frame with the handrail to make the slotting drill contact the surface of the plate body, the first electric slide drives the gantry and the slotter installed on the gantry to slot along the Y-axis direction, and the second electric slide drives the slotter through the connecting plate to slot along the horizontal direction of the gantry (X-axis direction) to complete the slotting operation of the required groove shape; the vacuum cleaner removes the debris in the conical cylinder through the vacuum tube; 3. Grinding: After the slotting is completed, the n-shaped frame is turned upward 180 degrees. The third electric slide drives the n-shaped frame and the grinder installed on the n-shaped frame to grind the slot in the Y direction. The grinder moves horizontally along the horizontal part of the n-shaped frame to grind the slot in the X direction.

[0015] The beneficial effects of the present invention are: 1. Through the cooperation of the first electric slide rail and the second electric slide rail, precise positioning in the X-axis and Y-axis directions is achieved, and the bidirectional precise movement of the slotter on the surface of the plate body is achieved, thereby achieving the effect of precise slotting operation on the surface of the plate body.

[0016] 2. The combined design of the first limiting plate, the second limiting plate and the cylinder can effectively limit plates of different shapes and sizes, thereby ensuring the stability of the plate body during the slotting operation, thereby reducing the processing error in the slotting operation.

[0017] 3. The conical tube automatically forms a closed space when the slotting drill bit contacts the plate, effectively preventing the debris generated during the slotting process from splashing. At the same time, the vacuum cleaner cleans the debris through the vacuum tube to keep the working environment clean.

[0018] 4. The third electric slide drives the N-shaped frame to move, combined with the manual adjustment function of the grinder, to achieve comprehensive grinding of the notches on the surface of the plate body in the X-axis and Y-axis directions, thereby improving processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the parts used for grooving the plate body in the present invention.

[0021] Figure 3 It is a partial three-dimensional structural diagram of the mounting frame, slotter, connecting sleeve and tapered cylinder of the present invention.

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the connecting sleeve, the tapered cylinder and the second spring of the present invention.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the components used for clamping and limiting the plate body in the present invention.

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the back plate, the first electric slide rail, the first limit plate, the second limit plate and other components of the present invention.

[0025] Figure 7 It is a partial three-dimensional structural diagram of the second limiting plate, cylinder and air pipe of the present invention.

[0026] Figure 8 It is a schematic diagram of the three-dimensional structure of the vacuum cleaner and the vacuum tube of the present invention.

[0027] Figure 9 It is a schematic diagram of the three-dimensional structure of the parts used for grinding the grooves on the surface of the plate body in the present invention.

[0028] Markings in the accompanying drawings: 1: rack, 100: plate body, 2: back plate, 3: first electric slide rail, 31: guide bar, 4: gantry, 5: slider, 6: mounting frame, 7: slotter, 71: handrail, 72: slotting drill bit, 8: second electric slide rail, 9: connecting plate, 10: first spring, 11: fill light, 12: connecting sleeve, 13: conical cylinder, 14: second spring, 15: first limit plate, 16: adjusting screw, 17: guide rod, 18: second limit plate, 181: cylinder, 182: air pipe, 183: air pump, 19: ruler, 20: vacuum cleaner, 21: vacuum pipe, 22: third electric slide rail, 23: N-shaped frame, 24: grinder. DETAILED DESCRIPTION

[0029] The following description is merely a preferred embodiment of the present invention and does not limit the scope of protection of the present invention.

[0030] Embodiment: A device for grooving the surface of a furniture plate, such as Figure 1-Figure 3As shown, it includes a frame 1, a backboard 2, a first electric slide 3, a gantry 4, a slider 5, a mounting frame 6, a slotter 7, a slotting drill bit 72, a second electric slide 8 and a connecting plate 9. A backboard 2 is provided on the top and back of the frame 1. First slide rails are provided on both side edges of the top of the frame 1 with the backboard 2 as the center. The first slide rails intersect with the backboard 2 vertically, and a gantry 4 is slidingly arranged between the two first slide rails. It is worth noting that the two first slide rails intersecting with the backboard 2 vertically can also be set as one for the first electric slide rail 3 and the other for the ordinary slide rail. In order to ensure the accuracy and stability of the horizontal movement of the gantry 4, the two first slide rails are both first electric slide rails 3. The slider of the first electric slide rail 3 is fixedly connected to the gantry 4. A controller for controlling the first electric slide rail 3 is provided on the frame 1. The controller is electrically connected to the first electric slide rail 3. The horizontal part of the gantry 4 is provided with a A slider 5 is provided, and a mounting frame 6 is provided on the slider 5. The mounting frame 6 includes an upper horizontal plate component, a lower horizontal plate component and a rod-shaped component between the upper and lower plate components. The rod-shaped part of the mounting frame 6 slides through the slider 5. A slotter 7 is installed at the lower part of the mounting frame 6. A slotting drill bit 72 is connected to the output shaft of the slotter 7. The slotting drill bit 72 is used to slot the surface of the plate body 100. An armrest 71 is installed on the mounting frame 6. The armrest 71 is arranged near the slotter 7. The armrest 71 is used to drive the mounting frame 6 to move up and down so that the slotting drill bit 72 of the slotter 7 contacts and cooperates with the plate body 100, thereby achieving the effect of slotting the surface of the plate body 100. A second electric slide rail 8 is installed on the back panel 2. The second electric slide rail 8 is electrically connected to the controller. A connecting plate 9 is slidingly provided on the slider of the second electric slide rail 8, and the connecting plate 9 is connected to the slider 5. During use, the operator drives the mounting frame 6 and the slotter 7 installed on the mounting frame 6 downward through the armrest 71, so that the slotting drill bit 72 approaches the plate body 100, and drives the gantry 4 to move horizontally along its axial direction through the first electric slide rails 3 on both sides, thereby realizing the slotting operation in the Y-axis direction of the surface of the plate body 100. Through the cooperation of the second electric slide rail 8 and the connecting plate 9, the slotter 7 is driven to move horizontally along the horizontal part of the gantry 4, thereby realizing the slotting operation in the X-axis direction of the surface of the plate body 100.

[0031] like Figure 1 、 Figure 2 、 Figure 5 and Figure 6As shown, two first electric slide rails 3 are provided with guide bars 31 on the opposite sides, and a first limit plate 15 is slidably arranged between the two guide bars 31. The first limit plate 15 is arranged parallel to the back plate 2, and an adjusting screw 16 and a guide rod 17 are arranged parallel to the back of the first limit plate 15, wherein the adjusting screw 16 is rotatably connected to the first limit plate 15, and the adjusting screw 16 is threaded through the back plate 2, and the guide rod 17 slides through the back plate 2. Two second limit plates 18 perpendicular to the first limit plate 15 are slidably arranged on the first limit plate 15, and the second limit plate 18 is parallel to the first electric slide rail 3. The position of the first limit plate 15 in the Y-axis direction at the top of the frame 1 is adjusted by rotating the adjusting screw 16 to adapt to plate bodies 100 of different widths, and the distance between the two second limit plates 18 is adjusted by sliding to adapt to plate bodies 100 of different lengths.

[0032] like Figure 5 and Figure 7 As shown, cylinders 181 are evenly spaced on at least one second limiting plate 18, and the piston rod of the cylinder 181 abuts against the side wall of the plate body 100. The cylinder 181 is connected to the air pump 183 provided on the frame 1 through the air pipe 182. When in use, the piston rod of the cylinder 181 abuts against the side wall of the plate body 100, and the air pump 183 inputs air pressure to the cylinder 181 through the air pipe 182, so that the piston rod of the cylinder 181 forms a clamping force on the plate body 100, thereby effectively limiting the plate body 100 of different shapes.

[0033] like Figure 2 As shown, a first spring 10 is provided between the upper portion of the mounting frame 6 and the slider 5. When in use, the mounting frame 6 and the slotter 7 are driven downward by the armrest 71, thereby compressing the first spring 10. When the mounting frame 6 is released, the first spring 10 drives the mounting frame 6 and the slotter 7 mounted on the mounting frame 6 to move upward and reset.

[0034] like Figure 3 As shown, a fill light 11 is installed at the lower part of the mounting frame 6. The fill light 11 is arranged on the side of the slotter 7. The fill light 11 is used to provide lighting in insufficient light conditions to facilitate the operator to observe the slotting process.

[0035] like Figure 5 As shown, scales 19 parallel to the first electric slide rail 3 are provided on both sides of the top of the frame 1. The scales 19 are used to accurately measure and locate the slotting position to improve the processing accuracy.

[0036] When in use, first place the plate body 100 to be grooved on the top plane of the frame 1, close to the right-angle reference formed by the first limit plate 15 and the second limit plate 18, and rotate the adjusting screw 16 to adjust the position of the first limit plate 15 so that the edge of the plate is aligned with the groove path; then, by starting the cylinder 181, the piston rod of the cylinder 181 abuts against the side wall of the plate body 100, thereby forming a flexible clamping of the plate body 100, thereby achieving effective limitation of the special-shaped plate, and achieving three-sided limitation of the plate in the above manner, which provides convenience for the groove operation on the surface of the plate body 100. After the plate body 100 is effectively limited, the first electric slide rails 3 arranged in parallel on both sides drive the gantry 4 to move as a whole in a direction perpendicular to the back plate 2 (Y axis), thereby realizing the precise positioning of the slotter 7 in the length direction of the plate, thereby facilitating the subsequent slotting operation in the Y axis direction on the surface of the plate body 100; the second electric slide rail 8 pushes the connecting plate 9, thereby driving the slider 5 to move along the horizontal part of the gantry 4 (X axis), thereby driving the slider 5 and the slotter 7 installed thereon to slide along the horizontal part of the gantry 4, this process can realize the slotting operation of the slotting drill bit 72 in the X direction on the surface of the plate; during the slotting operation, the operator drives the mounting frame 6 and the slotter 7 installed on the mounting frame 6 downward through the handrail 71, so that the slotting drill bit 72 contacts the top plane of the plate body 100, and controls the slotting depth of the slotting drill bit 72 by controlling the downward movement distance of the mounting frame 6 and the slotter 7.

[0037] like Figure 3 and Figure 4 As shown, a connecting sleeve 12 is installed at the bottom of the slotter 7, and the slotting drill bit 72 passes through the center of the connecting sleeve 12. A conical cylinder 13 is slidingly provided on the inner wall of the connecting sleeve 12, and the conical cylinder 13 is used to abut against the surface of the plate body 100. Balls are evenly spaced along the plane of the bottom of the conical cylinder 13. The setting of the balls facilitates the conical cylinder 13 to move along the surface of the plate body 100 with the slotter 7. A second spring 14 is provided between the top of the conical cylinder 13 and the upper part of the connecting sleeve 12; during the slotting operation, the slotter 7 and the slotting drill bit 72 move downward, and when the bottom of the conical cylinder 13 abuts against the surface of the plate body 100, the slotter 7 and the slotting drill bit 72 continue to move downward, and the conical cylinder 13 moves relative to each other along the inner wall of the connecting sleeve 12, and the debris generated by the slotting drill bit 72 of the slotter 7 during the slotting operation is covered by the conical cylinder 13, thereby achieving a dust-proof effect.

[0038] like Figure 1 、 Figure 4 and Figure 8 As shown, a vacuum cleaner 20 is installed on the back of the back plate 2 , and a dust suction pipe 21 is provided between the vacuum cleaner 20 and the conical cylinder 13 . When the vacuum cleaner 20 is working, the debris in the conical cylinder 13 is sucked out through the dust suction pipe 21 .

[0039] During the grooving operation, the conical cylinder 13 at the bottom of the groover 7 contacts the surface of the plate body 100 to form a closed space, which effectively prevents the debris generated by the grooving from splashing; at the same time, the vacuum cleaner 20 on the back of the backboard 2 sucks and cleans the debris in the conical cylinder 13 through the dust suction pipe 21, keeping the working environment clean.

[0040] like Figure 1 and Figure 9 As shown, a third electric slide rail 22 is installed on both outer walls of the frame 1 vertically adjacent to the back plate 2, and an N-shaped frame 23 is connected between the sliders of the third electric slide rail 22 for damping rotation. A grinder 24 is provided on the N-shaped frame 23 for damping sliding. The grinder 24 is used to grind the grooves opened on the surface of the plate body 100.

[0041] After the grooving is completed, the n-shaped frame 23 is flipped upward 180 degrees with the rotational connection point between it and the slider on the third electric slide rail 22 as the center, so that the n-shaped frame 23 and the grinder 24 installed on the n-shaped frame 23 are located above the frame 1 and the plate body 100; then, the n-shaped frame 23 is driven by the third electric slide rail 22 to move along the Y-axis direction of the top plane of the frame 1, thereby adjusting the specific position of the grinder 24 in the Y-axis direction, and the groove in the Y-axis direction opened on the surface of the plate body 100 can be polished. By manually driving the grinder 24 to move horizontally along the top of the n-shaped frame 23, the groove in the X-axis direction opened on the surface of the plate body 100 can be polished, thereby improving the surface quality and flatness of the groove.

[0042] A method for grooving the surface of a plate body 100 using the grooving device: 1. Plate Fixing: The plate body 100 is placed between the first limiting plate 15 and the second limiting plate 18, with the right angle of the plate body 100 overlapping the right angle of the first limiting plate 15 and the second limiting plate 18. Then, the adjusting screw 16 is rotated to drive the first limiting plate to move along the guide sleeve to the specified position. The second limiting plate 18 is slid and abutted against the side wall of the plate body 100. The air pump 183 is activated to force the piston rod of the cylinder 181 against the plate. 2. Slotting operation: Start the slotter 7 and the vacuum cleaner 20. Press down the mounting frame 6 via the handrail 71 so that the slotting drill bit 72 contacts the surface of the plate body 100. The first electric slide 3 drives the gantry 4 and the slotter 7 mounted on the gantry 4 to slot along the Y-axis direction. The second electric slide 8 drives the slotter 7 via the connecting plate 9 to slot along the horizontal direction (X-axis direction) of the gantry 4 to complete the slotting operation of the desired groove shape. The vacuum cleaner 20 removes debris from the conical cylinder 13 through the vacuum pipe 21. 3. Grinding: After the slotting is completed, the n-shaped frame 23 is turned upward by 180 degrees. The third electric slide 22 drives the n-shaped frame 23 and the grinder 24 installed on the n-shaped frame 23 to grind the slot in the Y direction. The grinder 24 moves horizontally along the horizontal part of the n-shaped frame 23 to grind the slot in the X direction.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for grooving the surface of furniture panels, characterized by: The invention comprises a frame (1), wherein a back plate (2) is provided on the top and back of the frame (1), first slide rails are provided on both side edges of the top of the frame (1) with the back plate (2) as the center, the first slide rails intersect the back plate (2) vertically, a gantry (4) is provided between the first slide rails, wherein at least one first slide rail is a first electric slide rail (3), a slider (5) is provided on the horizontal part of the gantry (4), a mounting frame (6) is provided on the slider (5), a rod-shaped part of the mounting frame (6) slides through the slider (5), a slotter (7) is provided on the lower part of the mounting frame (6), a slotting drill (72) is connected to the output shaft of the slotter (7), and the slotting drill (72) is used for slotting the surface of the plate body (100), a second electric slide rail (8) is provided on the back plate (2), a connecting plate (9) is provided on the slider of the second electric slide rail (8), and the connecting plate (9) is connected to the slider (5).

2. The device for grooving the surface of furniture board according to claim 1, characterized in that: A first limit plate (15) is slidably provided between the two first electric slide rails (3), and an adjusting screw (16) and a guide rod (17) are provided in parallel on the back of the first limit plate (15), wherein the adjusting screw (16) is rotatably connected to the first limit plate (15), and the adjusting screw (16) is threaded through the back plate (2), and the guide rod (17) slides through the back plate (2), and two second limit plates (18) perpendicular to the first limit plate (15) are slidably provided on the first limit plate (15).

3. The device for grooving the surface of furniture board according to claim 2, characterized in that: Cylinders (181) are evenly spaced apart on at least one second limiting plate (18), piston rods of the cylinders (181) abut against the side walls of the plate body (100), and the cylinders (181) are connected to an air pump (183) disposed on the frame (1) via an air pipe (182).

4. The device for grooving the surface of furniture board according to claim 3, characterized in that: A connecting sleeve (12) is installed at the bottom of the slotter (7), and the slotting drill bit (72) passes through the center of the connecting sleeve (12). A conical cylinder (13) is slidably provided on the inner wall of the connecting sleeve (12), and the conical cylinder (13) is used to abut against the surface of the plate body (100). A second elastic member is provided between the top of the conical cylinder (13) and the upper part of the connecting sleeve (12).

5. The device for grooving the surface of furniture board according to claim 4, characterized in that: A dust collector (20) is installed on the back of the back plate (2), and a dust collection pipe (21) is provided between the dust collector (20) and the conical cylinder (13).

6. The device for grooving the surface of furniture board according to claim 5, characterized in that: A third electric slide rail (22) is installed on both outer walls of the frame (1) vertically adjacent to the back plate (2), and an N-shaped frame (23) is connected between the sliders of the third electric slide rail (22) for damping rotation. A grinder (24) is provided on the N-shaped frame (23) for damping sliding. The grinder (24) is used to grind the grooves opened on the surface of the plate body (100).

7. The device for grooving the surface of furniture board according to claim 6, characterized in that: A first elastic member is provided between the upper portion of the mounting frame (6) and the slider (5), and the first elastic member is used to drive the mounting frame (6) and the slotter (7) mounted on the mounting frame (6) to reset.

8. The device for grooving the surface of furniture board according to claim 7, characterized in that: A fill light (11) is installed at the lower part of the mounting frame (6), and the fill light (11) is arranged on the side of the slotter (7).

9. The device for grooving the surface of furniture board according to claim 8, characterized in that: Scales (19) parallel to the first electric slide rail (3) are provided on both sides of the top of the frame (1).

10. A method for grooving a plate surface using the grooving device according to claims 1-9, characterized in that:

1. Plate fixing: The plate body (100) is placed between the first limit plate (15) and the second limit plate (18), and the right angle of the plate body (100) overlaps with the right angle of the first limit plate (15) and the second limit plate (18); then, the adjusting screw (16) is rotated to drive the first limit to move along the guide sleeve to a specified position, the other second limit plate (18) is slid and abutted against the side wall of the plate body (100), and the air pump (183) is started to make the piston rod of the cylinder (181) press the plate tightly; 2. Slotting operation: Start the slotter (7) and the vacuum cleaner (20), press the mounting frame (6) down through the handrail (71) so that the slotting drill bit (72) contacts the surface of the plate body (100), and the first electric slide rail (3) The gantry (4) and the slotter (7) mounted on the gantry (4) are driven to slot in the Y-axis direction, and the second electric slide (8) drives the slotter (7) to slot in the horizontal direction (X-axis direction) of the gantry (4) through the connecting plate (9), thereby completing the slotting operation of the desired slot type; the dust collector (20) removes the debris in the conical cylinder (13) through the dust collection pipe (21); 3. Grinding: After the slotting is completed, the n-shaped frame (23) is turned upward by 180 degrees, and the third electric slide (22) drives the n-shaped frame (23) and the grinder (24) mounted on the n-shaped frame (23) to perform a Y-direction grinding operation on the slot, and the grinder (24) moves horizontally along the horizontal part of the n-shaped frame (23) to perform an X-direction grinding operation on the slot.

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