EDGE GRINDING MACHINE AND GRINDING ADJUSTING METHOD OF EDGE GRINDING MACHINE

Abstract

A grinding adjusting method of an edge grinding machine, wherein the edge grinding machine includes a grinding carrier placing a sheet material, a grinding wheel, and an image sensing module. The grinding adjusting method includes capturing a sensing image by the image sensing module and detecting a sheet-material part and a grinding-wheel part of the sensing image; computing a first value of the sheet-material part and a second value of the grinding-wheel part; computing an adjusting value according to the first value and the second value; and adjusting a height of the grinding wheel or a height of the grinding carrier by using the adjusting value.

Claims

1. A grinding adjusting method for an edge grinding machine, the edge grinding machine comprising a grinding carrier placing a sheet material, a grinding wheel, and an image sensing module, the grinding adjusting method comprising: capturing a sensing image by the image sensing module and detecting a sheet-material part and a grinding-wheel part in the sensing image; computing a first value of the sheet-material part and a second value of the grinding-wheel part; computing an adjusting value according to the first value and the second value; and adjusting a height of the grinding wheel or a height of the grinding carrier by using the adjusting value.

2. The grinding adjusting method in claim 1, further comprising a step before the step of capturing the sensing image: moving the grinding carrier to move one lateral edge of the sheet material to be close to a location in front of a groove of the grinding wheel.

3. The grinding adjusting method in claim 1, wherein the step of detecting the sheet-material part and the grinding-wheel part in the sensing image comprises: setting a first detection frame on a first side of the sheet-material part and a second detection frame on a second side of the sheet-material part, wherein the first detection frame and the second detection frame respective has a first preset horizontal distance with respect to a lateral edge of the sheet-material part; and detecting a groove part of the grinding-wheel part and setting a third detection frame on a first side of the groove part and a fourth detection frame on a second side of the groove part, wherein the third detection frame and the fourth detection frame respective has a second preset horizontal distance with respect to the groove part.

4. The grinding adjusting method in claim 3, wherein the step of computing the first value of the sheet-material part and the second value of the grinding-wheel part comprises: sampling a plurality of pixel points in the first detection frame and the second detection frame respectively, and computing a first height value and a second height value of the sheet-material part respectively based on the plurality of pixel points in the first detection frame and the second detection frame; sampling a plurality of pixel points in the third detection frame and the fourth detection frame respectively, and computing a third height value and a fourth height value of the groove part respectively based on the plurality of pixel points in the third detection frame and the fourth detection frame; computing the first value of the sheet-material portion based on the first height value and the second height value; and computing the second value of the grinding-wheel part based on the third height value and the fourth height value.

5. The grinding adjusting method in claim 4, wherein the step of computing the first height value and the second height value of the sheet-material part respectively based on the plurality of pixel points in the first detection frame and the second detection frame comprises: computing a first statistical value of a vertical-axis coordinates of the plurality of pixel points in the first detection frame to obtain the first height value, and computing a second statistical value of the vertical-axis coordinates of the plurality of pixel points in the second detection frame to obtain the second height value; wherein the first statistical value and the second statistical value are average, median or mode of the vertical-axis coordinates.

6. The grinding adjusting method in claim 4, wherein the step of computing the third height value and the fourth height value of the groove part respectively based on the plurality of pixel points in the third detection frame and the fourth detection frame comprises: computing a third statistical value of a vertical-axis coordinates of the plurality of pixel points in the third detection frame to obtain the third height value, and computing a fourth statistical value of the vertical-axis coordinates of the plurality of pixel points in the fourth detection frame to obtain the fourth height value; wherein the third statistical value and the fourth statistical value are average, median or mode of the vertical-axis coordinates.

7. The grinding adjusting method in claim 1, wherein the step of adjusting the height of the grinding wheel or the height of the grinding carrier by using the adjusting value comprises moving up or down the grinding wheel or the grinding carrier based on the adjusting value along a vertical direction.

8. The grinding adjusting method in claim 1, wherein the step of capturing the sensing image by the image sensing module comprises: setting a shooting angle of the image sensing module to obtain the sensing image as a side view image of the sheet material along a depth direction.

9. The grinding adjusting method in claim 1, wherein the sheet material includes wafer, ceramic, glass or wood.

10. An edge grinding machine, comprising a grinding carrier configured to place a sheet material; a grinding wheel configured to grind the sheet material; an image sensing module configured to capture a sensing image comprising a sheet-material part and a grinding-wheel part; and a controller coupled to the grinding carrier, the grinding wheel, and the image sensing module, wherein the controller is configured to compute a first value of the sheet-material part and a second value of the grinding-wheel part; compute an adjusting value according to the first value and the second value; and adjust a height of the grinding wheel or a height of the grinding carrier by using the adjusting value.

11. The edge grinding machine in claim 10, wherein the controller is configured to move the grinding carrier to move one lateral edge of the sheet material to be close to a location in front of a groove of the grinding wheel before the image sensing module captures the sensing image.

12. The edge grinding machine in claim 10, wherein the controller is configured to detect the sheet-material part and the grinding-wheel part in the sensing image by: setting a first detection frame on a first side of the sheet-material part and a second detection frame on a second side of the sheet-material part, wherein the first detection frame and the second detection frame respective has a first preset horizontal distance with respect to a lateral edge of the sheet-material part; detecting a groove part of the grinding-wheel part and setting a third detection frame on a first side of the groove part and a fourth detection frame on a second side of the groove part, wherein the third detection frame and the fourth detection frame respective has a second preset horizontal distance with respect to the groove part.

13. The edge grinding machine in claim 12, wherein the controller is configured to compute the first value of the sheet-material part and the second value of the grinding-wheel part by: sampling a plurality of pixel points in the first detection frame and the second detection frame respectively, and computing a first height value and a second height value of the sheet-material part respectively based on the plurality of pixel points in the first detection frame and the second detection frame; sampling a plurality of pixel points in the third detection frame and the fourth detection frame respectively, and computing a third height value and a fourth height value of the groove part respectively based on the plurality of pixel points in the third detection frame and the fourth detection frame; computing the first value of the sheet-material portion based on the first height value and the second height value; and computing the second value of the grinding-wheel part based on the third height value and the fourth height value.

14. The edge grinding machine in claim 13, wherein the controller is configured to compute the first height value and the second height value of the sheet-material part respectively based on the plurality of pixel points in the first detection frame and the second detection frame by: computing a first statistical value of a vertical-axis coordinates of the plurality of pixel points in the first detection frame to obtain the first height value, and computing a second statistical value of the vertical-axis coordinates of the plurality of pixel points in the second detection frame to obtain the second height value; wherein the first statistical value and the second statistical value are average, median or mode of the vertical-axis coordinates.

15. The edge grinding machine in claim 13, wherein the controller is configured to compute the third height value and the fourth height value of the groove part respectively based on the plurality of pixel points in the third detection frame and the fourth detection frame by: computing a third statistical value of a vertical-axis coordinates of the plurality of pixel points in the third detection frame to obtain the third height value, and computing a fourth statistical value of the vertical-axis coordinates of the plurality of pixel points in the fourth detection frame to obtain the fourth height value; wherein the third statistical value and the fourth statistical value are average, median or mode of the vertical-axis coordinates.

16. The edge grinding machine in claim 10, wherein the controller is configured to adjust the height of the grinding wheel or the height of the grinding carrier by: moving up or down the grinding wheel or the grinding carrier based on the adjusting value along a vertical direction.

17. The edge grinding machine in claim 10, wherein the image sensing module is configured to have a shooting angle to obtain the sensing image, wherein the sensing image is a side view image of the sheet material along a depth direction.

18. The edge grinding machine in claim 10, wherein the sheet material includes wafer, ceramic, glass or wood.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a schematic diagram of the component configuration of the edge grinding machine according to an embodiment of the present disclosure.

[0010] FIG. 2 is a schematic diagram of a sensing image according to an embodiment of the present disclosure.

[0011] FIG. 3 is a flow chart of the grinding adjusting method of the edge grinding machine according to an embodiment of the present disclosure.

[0012] FIG. 4 is a flowchart of computing the first value of the sheet-material part and the second value of the grinding-wheel part according to an embodiment of the present disclosure.

[0013] FIG. 5 is a schematic diagram of the sensing image captured by the image sensing module.

[0014] FIG. 6 a schematic diagram showing that the controller sets detection frames in the sensing image.

[0015] FIG. 7 is a schematic diagram showing that the controller samples multiple pixel points.

[0016] FIG. 8 is a schematic diagram showing that a controller computing a height value from a plurality of sampled pixel points.

[0017] FIG. 9 is a schematic diagram showing the height adjustment between the sheet-material part and the grinding-wheel part.

[0018] FIG. 10 is a side view showing the sheet material after being ground by the edge grinding machine, which does not employ the grinding adjusting method of the present disclosure, for a certain period.

[0019] FIG. 11 is a side view showing the sheet material after being ground by the edge grinding machine, which employs the grinding adjusting method of the present disclosure, for a certain period.

[0020] FIG. 12 is a side view of the edge grinding machine according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

[0021] The technical contents of the present disclosure will become apparent with the detailed description of embodiments and the accompanied drawings as follows. However, it shall be noted that the accompanied drawings are for illustrative purposes only such that they shall not be used to restrict the scope of the present disclosure.

[0022] The edges of the sheet material generally have varying degrees of roughness after the sheet material is cut. The edge grinding machine is generally used to grind the edges of the sheet material to eliminate the roughness on edges of the sheet material and achieve consistent smoothness on edges of the sheet material.

[0023] Please refer to FIG. 1, which is a schematic diagram of the component configuration of the edge grinding machine according to an embodiment of the present disclosure.

[0024] The edge grinding machine 100 includes a grinding wheel 110, a grinding carrier 120, a controller 130 and an image sensing module 140. The controller 130 is coupled to the grinding wheel 110, the grinding carrier 120 and the image sensing module 140, and functions as a control center for controlling the operation of each component in the edge grinding machine 100.

[0025] The grinding carrier 120 supports the sheet material 150 and moves close to or away from the grinding wheel 110 along the horizontal direction (X-axis direction).

[0026] The grinding wheel 110 moves along the vertical direction (Y-axis direction) and is used for grinding the edge of the sheet material 150.

[0027] In one embodiment, the grinding carrier 120 moves close to the grinding wheel 110 along the horizontal direction. At the same time, the grinding wheel 110 descends from the standby position to the grinding position to grind the sheet material 150. After the grinding of the sheet material 150 is completed, the grinding wheel 110 rises from the grinding position to the standby position. At the same time, the grinding carrier 120 moves to the standby position from the grinding position along a direction away from the grinding wheel 110. The sheet material 150 on the grinding stage 120 is then clamped by a discharge crane (not shown) and moved to the next operation stage.

[0028] The image sensing module 140 is used to capture sensing images for the grinding wheel 110 and the grinding carrier 120 carrying the sheet material 150. The image sensing module 140 is configured with a shooting angle. The sensing images captured by the image sensing module 140 includes side view image of the sheet material 150 along the thickness direction, and one or more grooves of the grinding wheel 110 on or near the edge of the ground sheet material 150.

[0029] In one embodiment, the image sensing module 140 includes an image sensor 142, a light source 144 and a mirror 146. The light source 144 emits light toward the grinding wheel 110 and the grinding carrier 120 to provide compensation for the ambient light. The mirror 146 faces the grinding wheel 110 and the grinding carrier 120 and maintains an imaging angle with respect to the image sensor 142. The image sensor 142 faces the mirror 146 and captures the image of the mirror 146 through the imaging angle to capture the sensing image for the grinding wheel 110 and the grinding carrier 120.

[0030] In another embodiment, the image sensing module 140 may only include the image sensor 142, and the image sensor 142 directly captures the sensing images of the grinding wheel 110 and the grinding carrier 120. In above embodiment, the light source 144 and the mirror 146 can be omitted. More particularly, in the embodiment with the image sensing module 140 having the mirror 146, the image of the sensing image is opposite to the actual configuration of the grinding wheel 110 and the grinding carrier 120 carrying the sheet material 150 along left-and-right direction. However, this situation does not affect the operation of the controller 130 using the sensing image for grinding adjusting.

[0031] For brevity of the description, the following embodiments is exemplified with the embodiment of the image sensing module 140 including the image sensor 142 only.

[0032] The grinding wheel 110 includes a plurality of grooves (not shown), and each groove can be selected to grind the sheet material 150.

[0033] During the grinding operation, the grinding wheel 110 moves to the grinding position along the vertical direction, and the grinding carrier 120 moves to the preparation position along the horizontal direction. Therefore, the sheet material 150 is aligned with the center of one of the grooves of the grinding wheel 110. After the sheet material 150 is aligned with the center of the groove, the grinding carrier 120 continues to move toward the grinding wheel 110 along the horizontal direction (X-axis direction) such that the groove of the grinding wheel 110 is in contact with the sheet material 150 to grind the lateral edges of the sheet material 150.

[0034] In order to compensate the grinding height (either the height of the grinding wheel 110 or the height of the grinding stage 120) and to ensure alignment of the sheet material 150 with respect to the center of one of the grooves of the grinding wheel 110 for each grinding operation, the image sensing module 140 captures the sensing image and provides the sensing image to the controller 130. The controller 130 uses the information of the sensing image to compute the adjusting value, and uses the adjusting value to calibrate the height difference between the grinding wheel 110 and the grinding carrier 120.

[0035] In one embodiment, when the lateral edge of the sheet material 150 is close to the front side of one of the grooves of the grinding wheel 110 (the sheet material 150 has not yet completely entered the groove range), the image sensing module 140 faces the grinding wheel 110 and the grinding carrier 120 and shoots the sensing images for the grinding wheel 110 and the grinding carrier 120.

[0036] The controller 130 obtains the sensing image from the image sensing module 140. In one embodiment, the controller 130 detects the sheet-material part and the grinding-wheel part in the sensing image. The sheet-material part refers to a portion of the sheet martial 150 in the sensing image, such as a side view of the sheet material 150 and includes at least the lateral edges (e.g., peripheral borders) of the sheet material 150. The grinding-wheel part refers to the groove part of the grinding wheel 110 in the sensing image, for example, a side view of at least one groove of the grinding wheel 110. Namely, the sensing image includes a side view of at least the lateral edge of the sheet material 150 and the groove of the grinding wheel 110 closest to the lateral edge.

[0037] Please refer to FIG. 2, this figure is a schematic diagram of a sensing image according to an embodiment of the present disclosure.

[0038] The controller 130 receives the sensing image and detects the image features of the sensing image. The image features include a grinding-wheel part 210 and a sheet-material part 220. The grinding-wheel part 210 includes one of the grooves of grinding wheel 110 (namely, the groove closest to the sheet material 150). The sheet-material part 220 is a side view of the sheet material 150 and has image information of the boundaries surrounding the sheet 150 material, such as the lateral edges 242.

[0039] The controller 130 controls the movement of the grinding wheel 110 in the vertical direction (the Y-axis direction in FIG. 1). In order to align the groove center 234 of the groove part 232 of the grinding-wheel part 210 with the sheet center surface 244 of the sheet-material part 220, the controller 130 performs a grinding adjusting operation to calibrate the height of the grinding wheel 110 or the height of the grinding carrier 120 by sensing the image information.

[0040] In one embodiment, the controller 130 computes the first value of the sheet-material part 220 and the second value of the grinding-wheel part 210, and computes the adjusting value based on the first value and the second value. Afterward, the controller 130 uses the adjusting value to control the movement of the grinding wheel 110 or the grinding carrier 120 to calibrate the height of the grinding wheel 110 or the height of the grinding carrier 120 (for example, vertical up and down movement).

[0041] In one embodiment, the first value of the sheet-material part 220 and the second value of the grinding-wheel part 210 may be the Y coordinate (or coordinate value) of the image coordinate.

[0042] The controller 130 uses the image coordinates of the sensing image as a reference, and uses the Y coordinate of the image coordinates as the height value of each component in the image. For example, the controller 130 captures the first height values of a plurality of pixel points on the first side (upper side) of the sheet-material part 220, and computes first statistical value based on these first height values; the controller 130 captures the second height values of a plurality of pixel points on the second side (lower side) of the sheet-material part 220, and computes the second statistical value based on these second height values. The first statistical value and the second statistical value are respectively, for example, the average, median or mode of the first height values and the second height values of the plurality of pixel points. The controller 130 computes the first value of the sheet-material part 220 based on the first statistical value and the second statistical value. The first value of the sheet-material part 220 indicates the current height value of the sheet material 150.

[0043] On the other hand, the controller 130 captures the third height values of a plurality of pixel points on the first side (upper side) of the grinding-wheel part 210, and computes a third statistical value based on these third height values; the controller 130 captures the fourth height values of a plurality of pixel points on the second side (lower side) of the grinding-wheel part 210, and computes a fourth statistical value based on these fourth height values. The third statistical value and the fourth statistical value are respectively, for example, the average, median or mode of the third height value and the fourth height value of the plurality of pixel points. The controller 130 computes the second value of the grinding-wheel part 210 based on the third statistical value and the fourth statistical value. The second value of the grinding-wheel part 210 indicates the current height value of the grinding wheel 110.

[0044] The controller 130 obtains information of the physical height difference between the grinding wheel 110 and the grinding carrier 120 from the two height values in the sensing image and computes the adjusting value based on the physical height difference. Then the controller 130 uses the adjusting value to calibrate the height of the grinding wheel 110 or the height of the grinding carrier 120, and to adjust the height of the higher component to be lower or to adjust the height of the lower component to be higher, thus calibrating the height of the grinding wheel 110 or the height of the grinding carrier 120 and improving the grinding quality of the edge grinding machine 100.

[0045] The controller 130 can be any electronic device with a central processor.

[0046] The image sensor 142 may be a charge-coupled device (CCD), a complementary metal-oxide-semiconductor (CMOS) image sensor, a camera, or other hardware capable of capturing visible light images or invisible light images.

[0047] The light source 144 may be a visible light-emitting diode (LED) or an infrared light-emitting diode (IR LED).

[0048] The material of sheet material 150 includes wafer, ceramic, glass or wood.

[0049] Please refer to FIG. 3, which is a flow chart of the grinding adjusting method of the edge grinding machine according to an embodiment of the present disclosure. The grinding adjusting method may be performed by the edge grinding machine 100 of FIG. 1

[0050] In step S310, the image sensing module 140 captures the sensing image and the controller 130 detects the sheet-material part and the grinding-wheel part in the sensing image.

[0051] In step S320, the controller 130 computes the first value of the sheet-material part and the second value of the grinding-wheel part.

[0052] In step S330, the controller 130 computes the adjusting value based on the first value and the second value.

[0053] In step S340, the controller 130 uses the adjusting value to calibrate the height of the grinding wheel 110 or the height of the grinding carrier 120.

[0054] To further explain the operation of the controller 130 in computing the first value and the second value in step S320, please refer to FIG. 4 as well. FIG. 4 is a flowchart of computing the first value of the sheet-material part and the second value of the grinding-wheel part according to an embodiment of the present disclosure.

[0055] In one embodiment, the step S320 includes step S322, step S324 and step S326.

[0056] In step S322, the controller 130 sets a first detection frame on the first side (upper side) of the sheet-material part 220 and a second detection frame on the second side (lower side) of the sheet-material part 220. At the same time, the controller 130 sets a third detection frame on the first side (upper side) of the groove part 232 and a fourth detection frame on the second side (lower side) of the groove part 232.

[0057] In step S324, the controller 130 respectively samples a plurality of pixel points in the first detection frame and the second detection frame and computes the first height values and the second height values of the sheet-material part 220. At the same time, the controller 130 respectively samples a plurality of pixel values in the third detection frame and the fourth detection frame and computes the third height values and the fourth height values of the groove part 232.

[0058] In step S326, the controller 130 computes the first value of the sheet-material part 220 based on the first height values and the second height values, and computes the second value of the grinding-wheel part 210 based on the third height values and the fourth height values.

[0059] In one embodiment, the first value of the sheet-material part 220 indicates the current height value of the sheet material 150. The second value of the grinding wheel-part 210 indicates the current height value of the grinding wheel 110. Afterward, in step S330, the controller 130 may compute the adjusting value according to the first value and the second value.

[0060] FIG. 5 is a schematic diagram of the sensing image captured by the image sensing module.

[0061] As shown in FIG. 5, the controller 130 detects the sheet-material part 220 and the grinding-wheel part 210 in the sensing image (step S310). Please note that the grinding wheel 110 includes a plurality of grooves in structure thereof. The grinding carrier 120 moves in the horizontal direction (X-axis direction) to a location in front of the grinding wheel 110. At the same time, the grinding wheel 110 descends from the standby position to the grinding position. At this time, the sheet material 150 is closest to one of the grooves of the grinding wheel 110, such as groove 232 in FIG. 5. Further, the controller 130 detects the groove part 232 of the grinding-wheel part 210 to identify the image features of the groove part 232. Afterward, the controller 130 sets detection frames on the sheet-material part 220 and the groove part 232 respectively.

[0062] FIG. 6 is a schematic diagram showing that the controller sets detection frames in the sensing image.

[0063] As shown in FIG. 6, the controller 130 identifies the image features of the sheet-material part 220 and sets a first detection frame 612 on the first side (namely, the upper side) of the sheet-material part 220 and a second detection frame 614 on the second side (namely, the lower side) of the sheet-material part 220 (step S322).

[0064] The first detection frame 612 encompasses the edge features of the first side of the sheet-material part 220 such as the upper surface of the sheet material 150. The second detection frame 614 encompasses the edge features of the second side of the sheet-material part 220 such as the lower surface of the sheet material 150.

[0065] On the other hand, the controller 130 identifies the image features of the groove part 232, and sets the third detection frame 622 on the first side (namely, the upper side) of the groove part 232 and the fourth detection frame 624 on the second side (namely, the lower side) of the groove part 232 (step S322).

[0066] The third detection frame 622 encompasses the edge features of the first side of the groove part 232, such as the upper grinding face of the groove. The fourth detection frame 624 encompasses the edge features of the second side of the groove part 232, such as the lower grinding face of the groove.

[0067] In one embodiment, the controller 130 detects the lateral edge 242 of the sheet-material part 220 (for example, the right end edge of the sheet-material part 220 shown in FIG. 6), and sets the first detection frame 612 and the second detection frame 614 respectively at locations with a horizontal distance (the first preset horizontal distance P1) from the lateral edge 242. In other words, the horizontal distance between the first detection frame 612 and the lateral edge 242 and the horizontal distance between the second detection frame 614 and the lateral edge 242 are the same.

[0068] Accordingly, the image features of the first detection frame 612 and the second detection frame 614 correspond to a cross-section of the sheet material 150. For example, the cross-section is formed by the upper coordinates and the lower coordinate points respectively in the first detection frame 612 and the second detection frame 614, which have respectively the same X coordinates (namely, the first detection frame 612 and the second detection frame 614). The Y coordinate values of the upper and lower coordinate points represent the thickness information of the sheet material 150.

[0069] In one embodiment, the controller 130 detects the inner groove wall 632 of the groove part 232 (namely, the nearly-vertical grinding surface), and sets the third detection frame 622 and the fourth detection frame 624 respectively at locations with a horizontal distance (the second preset horizontal distance P2) from the inner groove wall 632. In other words, the horizontal distance between the third detection frame 622 and the inner groove wall 632 of the groove and the horizontal distance between the fourth detection frame 624 and the inner groove wall 632 of the groove are the same.

[0070] The controller 130 samples a plurality of pixel points in the first detection frame 612, a plurality of pixel points in the second detection frame 614, a plurality of pixel points in the third detection frame 622, and a plurality of pixel points in the fourth detection frame 624 (step S324).

[0071] FIG. 7 is a schematic diagram showing that the controller samples multiple pixel points. FIG. 8 is a schematic diagram showing that a controller computing a height value from a plurality of sampled pixel points.

[0072] As shown in FIG. 7, the controller 130 samples a plurality of pixel points in the first detection frame 612, and these pixel points are corresponding to the upper surface of the sheet material 150. The controller 130 computes a first height value of the sheet-material part 220 (such as the first height value 642 shown in FIG. 8) based on a plurality of pixel points.

[0073] In one embodiment, the controller 130 computes a first statistical value of the vertical axis coordinates (Y coordinates) of the plurality of pixel points in the first detection frame 612, where the first statistical value is, for example, the average, median or mode of the Y coordinates of the plurality of pixel points, and the controller 130 uses the first statistical value as the first height value 642 of the sheet-material part 220 (step S324). For example, the controller obtains 10 Y coordinates of 10 pixel points, computes the average value (first statistical value) of the 10 Y coordinates, and uses the average value as the first height value 642 of the sheet-material part 220 (step S324).

[0074] Similarly, as shown in FIG. 7, the controller 130 samples a plurality of pixel points in the second detection frame 614, and these pixel points are corresponding to the lower surface of the sheet material 150. The controller 130 computes a second height value of the sheet-material part 220 based on a plurality of pixel points, such as the second height value 644 shown in FIG. 8.

[0075] In one embodiment, the controller 130 computes a second statistical value of the vertical axis coordinates (Y coordinates) of the plurality of pixel points in the second detection frame 614, where the second statistical value is, for example, the average, median or mode of Y coordinates of the plurality of pixel points, and the controller 130 uses the second statistical value as the second height value 644 of the sheet-material part 220 (step S324).

[0076] The controller 130 computes the first value of the sheet-material part 220 based on the first height value 642 and the second height value 644 (step S326). In one embodiment, the controller 130 computes the average value of the first height value 642 and the second height value 644, and uses the average value as the first value. The controller 130 obtains the first value of the sheet-material part 220 and then obtains the sheet center surface 244 as shown in FIG. 2.

[0077] On the other hand, as shown in FIG. 7, the controller 130 samples a plurality of pixel points in the third detection frame 622, and these pixel points correspond to the upper grinding wall of the corresponding groove. The controller 130 computes a third height value of the groove part 232 (such as the third height value 662 shown in FIG. 8) based on a plurality of pixel points.

[0078] In one embodiment, the controller 130 computes a third statistical value of the vertical-axis coordinates (Y coordinates) of the plurality of pixel points in the third detection frame 622 and uses the third statistical value as the third height value 662, where the third statistical value is, for example, the average, median or mode of the Y coordinates. For example, the controller 130 obtains 10 Y coordinates of 10 pixel points, computes the average value (the third statistical value) of the 10 Y coordinates, and uses the average value as the third height value 662 of the groove part 232 (step S324).

[0079] Similarly, as shown in FIG. 7, the controller 130 samples a plurality of pixel points in the fourth detection frame 624, and these pixel points correspond to the lower grinding wall of the corresponding groove. The controller 130 computes a fourth height value of the groove part 232 based on a plurality of pixel points, such as the fourth height value 664 shown in FIG. 8.

[0080] In one embodiment, the controller 130 computes a fourth statistical value of the vertical-axis coordinates (Y coordinates) of the plurality of pixel points in the fourth detection frame 624 and uses the fourth statistical value as the fourth height value 664, where the fourth statistical value is, for example, the average, median or mode of the Y coordinates.

[0081] The controller 130 computes the second value of the groove part 232 based on the third height value 662 and the fourth height value 664 (step S326). In one embodiment, the controller 130 computes the average of the third height value 662 and the fourth height value 664, and uses the average value as the second value. The controller 130 obtains the second value of the groove part 232, and then obtains the groove center 234 as shown in FIG. 2.

[0082] FIG. 9 is a schematic diagram showing the height adjustment between the sheet-material part and the grinding-wheel part.

[0083] Based on the above description, the controller 130 computes the first value of the sheet-material part 220 to obtain the sheet center surface 244 indicating the height of the sheet-material part 220. At the same time, the controller 130 computes the second value of the groove part 232 to obtain the groove center 234 indicating the height of the groove part 232. Afterward, the controller 130 computes the difference between the first value and the second value to obtain the height difference between the sheet center surface of the sheet-material part 220 and the groove center of the groove part 232. For example, if a difference value of the first value minus the second value is a positive value, it means that the central surface 244 of the sheet material is higher than the groove center 234. At this time, the controller 130 will lower the height of the grinding carrier 120, and use the positive value as the lowering value. On the contrary, if the difference value of the first value minus the second value is a negative value, it means that the center of the sheet material is lower than the groove center 234. At this time, the controller 130 lowers the height of the grinding wheel 110, and use the absolute value of this negative value as the lowering value.

[0084] After the aforementioned calibration operation, the horizontal heights of the grinding wheel 110 and the sheet material 150 can be calibrated so that the lateral edge of the sheet material 150 is aligned with the groove center 234 of the grinding wheel 110. In this way, the upper end edge between the central surface 244 of the sheet material and the upper plane, and the lower end edge between the central surface 244 and the lower plane of the sheet material can be evenly ground, so that the lateral edge of the sheet material 150 is evenly ground.

[0085] FIG. 10 is a side view showing the sheet material after being ground by the edge grinding machine, which does not employ the grinding adjusting method of the present disclosure, for a certain period.

[0086] After the edge grinding machine grinds a large number of sheets material, the components and slide rails of the edge grinding machine may be deformed due to thermal expansion and cold contraction, so that the sheet material may not be precisely placed in the center of the grinding wheel groove during grinding. After a period of operation, the upper part and lower part of the sheet material will be ground with slightly different degrees. As shown in FIG. 10, the grinding degree A1 of the lateral edge between the central surface 812 of the sheet material and the upper plane 814 of the sheet material is greater than the grinding degree A2 of the lateral edge between the central surface 812 of the sheet material and the lower plane 816 of the of the sheet material. In other words, the grinding degree A1 and the grinding degree A2 are inconsistent, and the edge grinding machine needs to be calibrated.

[0087] FIG. 11 is a side view showing the sheet material after being ground by the edge grinding machine, which employs the grinding adjusting method of the present disclosure, for a certain period.

[0088] As shown in FIG. 11, the grinding degree B1 of the lateral edge between the sheet central surface 822 and the upper plane 824 of the sheet material is substantially the same as the grinding degree A2 of the lateral edge between the sheet central surface 812 and the lower plane 826 of the sheet material. Apparently, after the edge grinding machine 100 is subject to grinding adjusting, the grinding wheel 110 can evenly grind the portion from the center surface 822 to the upper plane 824 and the portion from the center surface 822 to the lower plane 826 of the sheet material 150 based on the lateral edge of the center surface 822 of the sheet material 150. In this way, the grinding degree of the lateral edge of the sheet material 150 is up-and-down uniform, and the grinding quality is improved.

[0089] FIG. 12 is a side view of the edge grinding machine according to an embodiment of the present disclosure.

[0090] The edge grinding machine includes a grinding wheel 910, a cutter cylinder 930 and a cutter shaft (not shown in the figure). The grinding spindle 920 of the edge grinding machine is coupled to the cutter cylinder 930. The cutter cylinder 930 is used to clamp or loosen the cutter, so that the grinding wheel 910 connected to the cutter shaft is also clamped or loosened together.

[0091] In one embodiment, the grinding spindle 920 of the edge grinding machine is provided with a disc spring (not shown) and a button (not shown). The button is used to control the disc spring to release the cutter shaft and the grinding wheel 910 (which are connected to the cutter cylinder 930) from the cutter cylinder 930. For example, when the user presses the button to drive the elastic force of the disc spring, the cutter shaft and the grinding wheel 910 are accordingly released from the cutter cylinder 930. Therefore, user can combine the cutter shaft and the grinding wheel 910 outside the edge grinding machine first and then the cutter shaft and the grinding wheel, together forming an assembly, can be mounted to the cutter cylinder 930. The grinding wheel 910 can be easily replaced to greatly shorten the replacement time.

[0092] To sum up, the present disclosure provides an edge grinding machine and a grinding adjusting method for the edge grinding machine. The edge grinding machine first uses an image sensing module to capture the side view image of the sheet material and the grinding wheel before grinding the sheet material. The edge grinding machine measures a height difference between the sheet material and the groove center and the height difference information is fed back to the controller. The controller adjusts the height of the grinding wheel or the grinding carrier based on the height difference information, thus achieving optimal grinding quality.

[0093] It shall be understood that the present disclosure may have other types of embodiments, and a person with ordinary skills in the art of the technical field of the present disclosure may make various changes and modifications corresponding to the present disclosure without deviating the principle and substance of the present disclosure; however, such corresponding changes and modification shall be considered to be within the claimed scope of the present disclosure.