阅读说明：本技术 一种用于带槽零件的双面自动倒角装置 (Double-sided automatic chamfering device for part with groove ) 是由 方国祥 冯锦松 吕允亨 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种用于带槽零件的双面自动倒角装置,包括支撑架,支撑架上设有皮带传输系统,皮带传输系统上设有与皮带传输系统相配的轨道宽度调节装置,皮带传输系统又与自动倒角装置相连；本发明设计巧妙,能够实现带槽零件的自动化传输与双面倒角,且还能根据带槽零件的大小调节轨道的宽度与倒角刀之间的距离,使得装置能够适配不同规格的零件,并且倒角的大小还可以调节,倒角效率高,维护安装方便。(The invention discloses a double-sided automatic chamfering device for a part with a groove, which comprises a support frame, wherein a belt transmission system is arranged on the support frame, a track width adjusting device matched with the belt transmission system is arranged on the belt transmission system, and the belt transmission system is connected with an automatic chamfering device; the double-sided chamfering device is ingenious in design, can realize automatic transmission and double-sided chamfering of the parts with the grooves, can adjust the width of the track and the distance between the chamfering cutters according to the size of the parts with the grooves, enables the device to be adaptive to parts with different specifications, can adjust the size of the chamfering, is high in chamfering efficiency, and is convenient to maintain and install.)

1. A double-sided automatic chamfering device for a part with a groove is characterized by comprising a support frame, wherein a belt transmission system is arranged on the support frame, a track width adjusting device matched with the belt transmission system is arranged on the belt transmission system, and the belt transmission system is connected with an automatic chamfering device;

the belt transmission system comprises a driving wheel and a driven wheel which are respectively arranged at two ends of a support frame, the driving wheel is connected with a driving motor, a conveying belt is arranged between the driving wheel and the driven wheel, anti-skid patterns are arranged on the conveying belt, a first stop block and a second stop block are arranged at the middle position of the conveying belt, the shapes of the first stop block and the second stop block are matched with those of belt groove parts, the first stop block is connected with a piston rod of a first limiting cylinder, the second stop block is connected with a piston rod of a second limiting cylinder, the first limiting cylinder and the second limiting cylinder are arranged on the side surface of the support frame, a first infrared emitter is arranged between the first limiting cylinder and the second limiting cylinder, a first infrared receiver is arranged at the other side of the support frame and the position opposite to the first infrared emitter, a guide blocking piece is arranged at the tail end of the conveying belt, the guide blocking piece is erected above the conveying belt, and a push block is arranged in front of the guide blocking piece, the push block is connected with a piston rod of the conveying cylinder, the extension direction of the piston rod is perpendicular to the conveying direction of the conveying belt, a second infrared transmitter pointing to the front of the push block is arranged beside the conveying cylinder, and a second infrared receiver matched with the second infrared transmitter is arranged in front of the second infrared transmitter;

the track width adjusting device comprises a track arranged above a conveyor belt, the track comprises a group of strip-shaped sheet bodies which are parallel to each other, the length of the strip-shaped sheet body on the left side is smaller than that of the strip-shaped sheet body on the right side, the heads of the strip-shaped sheet bodies on the left side and the right side are aligned, a conveying gap is formed at the tail parts of the strip-shaped sheet bodies on the left side and the right side, the strip-shaped sheet bodies are erected above the conveyor belt through a plurality of adjusters, each adjuster comprises a rectangular block arranged on the side surface of a supporting frame, the rectangular block is connected with the supporting frame through a connecting sheet arranged below the rectangular block, two ends of the connecting sheet are provided with a long round hole, the side surface of the rectangular block is provided with a through hole, a cylindrical pin is arranged in the through hole, the direction of the cylindrical pin is vertical to the direction of the strip-shaped sheet bodies, the top of the rectangular block is provided with a threaded hole communicated with the through hole, one end of the cylindrical pin is fixed in the through hole through a rotating handle matched with the threaded hole, the other end of the cylindrical pin is connected with the strip-shaped sheet body through a bolt;

the automatic chamfering device comprises a part fixing seat arranged beside a conveying gap, the part fixing seat is arranged on the side surface of a support frame, the part fixing seat is provided with a belt groove part to be chamfered, the belt groove part is provided with a groove running through the upper surface and the lower surface of the belt groove part, the part fixing seat is provided with a limiting block matched with the shape of the belt groove part on the upper side, the lower side and the left side of the belt groove part, the right side of the part fixing seat connected with the support frame is provided with a part inlet, the part fixing seat is provided with a processing through groove below the groove of the belt groove part, a reset cylinder is arranged behind the part fixing seat, the expansion direction of a piston rod of the reset cylinder is consistent with the groove direction of the belt groove part, the tail part of the reset cylinder is connected with the part fixing seat, the piston rod of the reset cylinder is connected with the short edge of an L-shaped mounting plate, a sliding groove is arranged below the long edge of the L-shaped mounting plate, the L-shaped mounting plate is connected with a first sliding rail above the reset cylinder through the sliding groove, the side surface of the reset cylinder is provided with a propelling cylinder, the propelling cylinder and the reset cylinder are oppositely arranged in the direction, the tail part of the propelling cylinder is connected with the L-shaped mounting plate through a connecting seat, the telescopic direction of a piston rod of the propelling cylinder is opposite to the telescopic direction of the piston rod of the reset cylinder, the piston rod of the propelling cylinder is connected with the chamfering mechanism through a connecting plate, the side surface of the connecting plate is provided with a sliding block seat, the sliding block seat is connected with a second sliding rail above the L-shaped mounting plate, and the second sliding rail is parallel to the first sliding rail;

the chamfering mechanism comprises a slide rail seat arranged in the vertical direction, a third slide rail with the direction perpendicular to the horizontal plane is arranged on the slide rail seat, a lifting air cylinder is arranged at the top and the bottom of the slide rail seat, the extending direction of a piston rod of the lifting air cylinder extends from the end part to the middle part of the slide rail seat, the piston rod of the lifting air cylinder is connected with a connecting block, a sliding groove matched with the third slide rail is arranged on the back surface of the connecting block, a connecting rod is arranged on the front surface of the connecting block, one end of the connecting rod is hinged with the connecting block, a chamfering knife is arranged at the other end of the connecting rod, the position of the chamfering knife is aligned with the notch of a part with a groove, a pressure rod is arranged above the connecting rod, one end of the pressure rod is connected with the connecting block, a long circular hole is arranged at the other end of the pressure rod, the pressure rod is connected with the connecting rod through a bolt penetrating through the long circular hole, a spring is arranged between the pressure rod and the connecting rod, and the spring is sleeved on the bolt penetrating through the long circular hole, be equipped with thickness micromatic setting between two upper and lower connecting blocks, thickness micromatic setting include the regulating plate, be equipped with the regulating block between regulating plate and the connecting block.

2. The automatic double-sided chamfering device for grooved parts as claimed in claim 1, wherein the support frame comprises a plurality of welded rectangular pipes, the surfaces of which are coated with three-proofing paint.

3. The double-sided automatic chamfering device for grooved parts according to claim 1, wherein the chamfering tool is a double-edged chamfering tool, and the material of the chamfering tool is high speed steel.

4. The apparatus of claim 1, wherein the strip is made of stainless steel and the corners of the strip are rounded.

5. The apparatus of claim 1, wherein the connecting plates and the slider housing are made of cast iron and are welded to each other.

6. The apparatus of claim 1, wherein the L-shaped mounting plate is formed by milling, and the L-shaped mounting plate is made of aluminum.

Technical Field

The invention relates to a double-sided automatic chamfering device for a grooved part.

Background

At present, the chamfer of the notch of the part with the groove is generally finished manually, so that the cost is high, manpower is wasted, the efficiency is not high, and the chamfer specification is not well controlled, so that an automatic chamfer device is urgently needed.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provides a double-sided automatic chamfering device for grooved parts.

A double-sided automatic chamfering device for a part with a groove comprises a support frame, wherein a belt transmission system is arranged on the support frame, a track width adjusting device matched with the belt transmission system is arranged on the belt transmission system, and the belt transmission system is connected with the automatic chamfering device;

the belt transmission system comprises a driving wheel and a driven wheel which are respectively arranged at two ends of a support frame, the driving wheel is connected with a driving motor, a conveying belt is arranged between the driving wheel and the driven wheel, anti-skid patterns are arranged on the conveying belt, a first stop block and a second stop block are arranged at the middle position of the conveying belt, the shapes of the first stop block and the second stop block are matched with those of belt groove parts, the first stop block is connected with a piston rod of a first limiting cylinder, the second stop block is connected with a piston rod of a second limiting cylinder, the first limiting cylinder and the second limiting cylinder are arranged on the side surface of the support frame, a first infrared emitter is arranged between the first limiting cylinder and the second limiting cylinder, a first infrared receiver is arranged at the other side of the support frame and the position opposite to the first infrared emitter, a guide blocking piece is arranged at the tail end of the conveying belt, the guide blocking piece is erected above the conveying belt, and a push block is arranged in front of the guide blocking piece, the push block is connected with a piston rod of the conveying cylinder, the extension direction of the piston rod is perpendicular to the conveying direction of the conveying belt, a second infrared transmitter pointing to the front of the push block is arranged beside the conveying cylinder, and a second infrared receiver matched with the second infrared transmitter is arranged in front of the second infrared transmitter;

the track width adjusting device comprises a track arranged above a conveyor belt, the track comprises a group of strip-shaped sheet bodies which are parallel to each other, the length of the strip-shaped sheet body on the left side is smaller than that of the strip-shaped sheet body on the right side, the heads of the strip-shaped sheet bodies on the left side and the right side are aligned, a conveying gap is formed at the tail parts of the strip-shaped sheet bodies on the left side and the right side, the strip-shaped sheet bodies are erected above the conveyor belt through a plurality of adjusters, each adjuster comprises a rectangular block arranged on the side surface of a supporting frame, the rectangular block is connected with the supporting frame through a connecting sheet arranged below the rectangular block, two ends of the connecting sheet are provided with a long round hole, the side surface of the rectangular block is provided with a through hole, a cylindrical pin is arranged in the through hole, the direction of the cylindrical pin is vertical to the direction of the strip-shaped sheet bodies, the top of the rectangular block is provided with a threaded hole communicated with the through hole, one end of the cylindrical pin is fixed in the through hole through a rotating handle matched with the threaded hole, the other end of the cylindrical pin is connected with the strip-shaped sheet body through a bolt;

the automatic chamfering device comprises a part fixing seat arranged beside a conveying gap, the part fixing seat is arranged on the side surface of a support frame, the part fixing seat is provided with a belt groove part to be chamfered, the belt groove part is provided with a groove running through the upper surface and the lower surface of the belt groove part, the part fixing seat is provided with a limiting block matched with the shape of the belt groove part on the upper side, the lower side and the left side of the belt groove part, the right side of the part fixing seat connected with the support frame is provided with a part inlet, the part fixing seat is provided with a processing through groove below the groove of the belt groove part, a reset cylinder is arranged behind the part fixing seat, the expansion direction of a piston rod of the reset cylinder is consistent with the groove direction of the belt groove part, the tail part of the reset cylinder is connected with the part fixing seat, the piston rod of the reset cylinder is connected with the short edge of an L-shaped mounting plate, a sliding groove is arranged below the long edge of the L-shaped mounting plate, the L-shaped mounting plate is connected with a first sliding rail above the reset cylinder through the sliding groove, the side surface of the reset cylinder is provided with a propelling cylinder, the propelling cylinder and the reset cylinder are oppositely arranged in the direction, the tail part of the propelling cylinder is connected with the L-shaped mounting plate through a connecting seat, the telescopic direction of a piston rod of the propelling cylinder is opposite to the telescopic direction of the piston rod of the reset cylinder, the piston rod of the propelling cylinder is connected with the chamfering mechanism through a connecting plate, the side surface of the connecting plate is provided with a sliding block seat, the sliding block seat is connected with a second sliding rail above the L-shaped mounting plate, and the second sliding rail is parallel to the first sliding rail;

the chamfering mechanism comprises a slide rail seat arranged in the vertical direction, a third slide rail with the direction perpendicular to the horizontal plane is arranged on the slide rail seat, a lifting air cylinder is arranged at the top and the bottom of the slide rail seat, the extending direction of a piston rod of the lifting air cylinder extends from the end part to the middle part of the slide rail seat, the piston rod of the lifting air cylinder is connected with a connecting block, a sliding groove matched with the third slide rail is arranged on the back surface of the connecting block, a connecting rod is arranged on the front surface of the connecting block, one end of the connecting rod is hinged with the connecting block, a chamfering knife is arranged at the other end of the connecting rod, the position of the chamfering knife is aligned with the notch of a part with a groove, a pressure rod is arranged above the connecting rod, one end of the pressure rod is connected with the connecting block, a long circular hole is arranged at the other end of the pressure rod, the pressure rod is connected with the connecting rod through a bolt penetrating through the long circular hole, a spring is arranged between the pressure rod and the connecting rod, and the spring is sleeved on the bolt penetrating through the long circular hole, be equipped with thickness micromatic setting between two upper and lower connecting blocks, thickness micromatic setting include the regulating plate, be equipped with the regulating block between regulating plate and the connecting block.

As a further improvement, the support frame comprises a plurality of rectangular pipes which are welded and connected, and the surfaces of the rectangular pipes are coated with three-proofing paint.

As a further improvement, the chamfering tool is a double-edge chamfering tool, and the material of the chamfering tool is high-speed steel.

As a further improvement, the strip-shaped sheet body is made of stainless steel, and corners of the strip-shaped sheet body are all round corners.

As a further improvement, the connecting plate and the slider seat are made of cast iron and are connected through welding.

As a further improvement, the L-shaped mounting plate is formed by milling, and the L-shaped mounting plate is made of aluminum.

Has the advantages that:

the double-sided chamfering device is ingenious in design, can realize automatic transmission and double-sided chamfering of the parts with the grooves, can adjust the width of the track and the distance between the chamfering cutters according to the size of the parts with the grooves, enables the device to be adaptive to parts with different specifications, can adjust the size of the chamfering, is high in chamfering efficiency, and is convenient to maintain and install.

Drawings

FIG. 1 is a schematic view of the overall structure of a double-sided automatic chamfering apparatus;

FIG. 2 is a schematic structural view of a belt transport system;

FIG. 3 is a schematic view of the regulator;

FIG. 4 is a schematic structural view of an automatic chamfering apparatus;

FIG. 5 is a top view of the automatic chamfering apparatus;

FIG. 6 is a schematic structural view of a chamfering mechanism;

FIG. 7 is a side view of the chamfering mechanism;

1. the supporting frame 2, the belt transmission system 3, the track width adjusting device 4, the automatic chamfering device 5, the driving wheel 6, the driven wheel 7, the driving motor 8, the first stop block 9, the second stop block 10, the belt groove part 11, the first limit cylinder 12, the second limit cylinder 13, the first infrared emitter 14, the first infrared receiver 15, the conveyor belt 16, the guide stop piece 17, the push block 18, the conveyor cylinder 19, the second infrared emitter 20, the second infrared receiver 21, the strip-shaped sheet body 22, the conveying notch 23, the adjuster 24, the rectangular block 25, the connecting sheet 26, the cylindrical pin 27, the rotating handle 28, the part fixing seat 29, the limiting block 30, the processing through groove 31, the reset cylinder 32, the L-shaped mounting plate 33, the first slide rail 34, the push cylinder 35, the connecting plate 36, the slide block seat 37, the second slide rail 38, the chamfering mechanism 39, the slide rail seat 40, the third slide rail 41, the lifting cylinder 42, the connecting block 43, the connecting rod 44, the chamfering knife 45, the pressing rod 46, the spring 47, the adjusting plate 48, the adjusting device And (5) blocking.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

As shown in figures 1-7, a double-sided automatic chamfering device for grooved parts comprises a support frame 1, a belt transmission system 2, a track width adjusting device 3, an automatic chamfering device 4, a driving wheel 5, a driven wheel 6, a driving motor 7, a first stop block 8, a second stop block 9, a grooved part 10, a first limit cylinder 11, a second limit cylinder 12, a first infrared emitter 13, a first infrared receiver 14, a conveyor belt 15, a guide stop piece 16, a push block 17, a conveying cylinder 18, a second infrared emitter 19, a second infrared receiver 20, a strip-shaped sheet body 21, a conveying gap 22, an adjuster 23, a rectangular block 24, a connecting sheet 25, a cylindrical pin 26, a rotating handle 27, a part fixing seat 28, a stop block 29, a processing through groove 30, a reset cylinder 31, an L-shaped mounting plate 32, a first slide rail 33, a pushing cylinder 34, a connecting plate 35, a slide block seat 36, The device comprises a second slide rail 37, a chamfering mechanism 38, a slide rail seat 39, a third slide rail 40, a lifting cylinder 41, a connecting block 42, a connecting rod 43, a chamfering knife 44, a pressure rod 45, a spring 46, an adjusting plate 47 and an adjusting block 48.

A double-sided automatic chamfering device for a part with a groove comprises a support frame 1, wherein a belt transmission system 2 is arranged on the support frame 1, a track width adjusting device 3 matched with the belt transmission system 2 is arranged on the belt transmission system 2, and the belt transmission system 2 is connected with an automatic chamfering device 4;

the belt transmission system 2 comprises a driving wheel 5 and a driven wheel 6 which are respectively arranged at two ends of a support frame 1, the driving wheel 5 is connected with a driving motor 7, a conveying belt 15 is arranged between the driving wheel 5 and the driven wheel 6, anti-skid patterns are arranged on the conveying belt 15, a first stop block 8 and a second stop block 9 are arranged at the middle position of the conveying belt 15, the shapes of the first stop block 8 and the second stop block 9 are matched with a belt groove part 10, the first stop block 8 is connected with a piston rod of a first limiting cylinder 11, the second stop block 9 is connected with a piston rod of a second limiting cylinder 12, the first limiting cylinder 11 and the second limiting cylinder 12 are arranged at the side surface of the support frame 1, a first infrared emitter 13 is arranged between the first limiting cylinder 11 and the second limiting cylinder 12, a first infrared receiver 14 is arranged at the opposite position of the other side of the support frame 1 and the first infrared emitter 13, and a guide baffle 16 is arranged at the tail end of the conveying belt 15, the guide baffle 16 is erected above the conveyor belt 15, a push block 17 is arranged in front of the guide baffle 16, the push block 17 is connected with a piston rod of a conveying cylinder 18, the extension and contraction directions of the piston rod are all perpendicular to the conveying direction of the conveyor belt 15, a second infrared transmitter 19 pointing to the front of the push block 17 is also arranged beside the conveying cylinder 18, and a second infrared receiver 20 matched with the second infrared transmitter 19 is arranged in front of the second infrared transmitter 19;

the track width adjusting device 3 comprises a track arranged above a conveyor belt 15, the track comprises a group of strip-shaped sheet bodies 21 which are parallel to each other, the length of the strip-shaped sheet body 21 on the left side is smaller than that of the strip-shaped sheet body 21 on the right side, the heads of the strip-shaped sheet bodies 21 on the left side and the right side are aligned, a conveying gap 22 is formed at the tail parts of the strip-shaped sheet bodies 21 on the left side and the right side, the strip-shaped sheet bodies 21 are arranged above the conveyor belt 15 through a plurality of adjusters 23, each adjuster 23 comprises a rectangular block 24 arranged on the side surface of a support frame 1, each rectangular block 24 is connected with the support frame 1 through a connecting sheet 25 arranged below the rectangular block 24, two ends of each connecting sheet 25 are provided with a long round hole, a through hole is arranged on the side surface of each rectangular block 24, a cylindrical pin 26 is arranged in each through hole, the direction of the cylindrical pin 26 is vertical to the direction of the strip-shaped sheet bodies 21, and a threaded hole communicated with the through holes is arranged at the top part of the rectangular block 24, one end of the cylindrical pin 26 is fixed in the through hole through a rotating handle 27 matched with the threaded hole, and the other end of the cylindrical pin 26 is connected with the strip-shaped sheet body 21 through a bolt;

the automatic chamfering device 4 comprises a part fixing seat 28 arranged beside a conveying gap 22, the part fixing seat 28 is arranged on the side surface of a support frame 1, the part fixing seat 28 is provided with a belt groove part 10 to be chamfered, the belt groove part 10 is provided with a groove running through the upper surface and the lower surface of the belt groove part 10, the part fixing seat 28 is provided with a limit block 29 matched with the shape of the belt groove part 10 on the upper side, the lower side and the left side, the right side of the part fixing seat 28 connected with the support frame 1 is provided with a part inlet, the part fixing seat 28 is provided with a processing through groove 30 below the groove of the belt groove part 10, a reset cylinder 31 is arranged behind the part fixing seat 28, the telescopic direction of a piston rod of the reset cylinder 31 is consistent with the grooving direction of the belt groove part 10, the tail part of the reset cylinder 31 is connected with the part fixing seat 28, the piston rod of the reset cylinder 31 is connected with the short side of an L-shaped mounting plate 32, a sliding groove is arranged below the long edge of the L-shaped mounting plate 32, the L-shaped mounting plate 32 is connected with a first sliding rail 33 above the reset cylinder 31 through the sliding groove, a pushing cylinder 34 is arranged on the side surface of the reset cylinder 31, the pushing cylinder 34 and the reset cylinder 31 are oppositely arranged in the direction, the tail part of the pushing cylinder 34 is connected with the L-shaped mounting plate 32 through a connecting seat, the expansion direction of a piston rod of the pushing cylinder 34 is opposite to the expansion direction of a piston rod of the reset cylinder 31, the piston rod of the pushing cylinder 34 is connected with a chamfering mechanism 38 through a connecting plate 35, a sliding block seat 36 is arranged on the side surface of the connecting plate 35, the sliding block seat 36 is connected with a second sliding rail 37 above the L-shaped mounting plate 32, and the second sliding rail 37 is parallel to the first sliding rail 33;

the chamfering mechanism 38 comprises a slide rail seat 39 arranged in the vertical direction, a third slide rail 40 with the direction perpendicular to the horizontal plane is arranged on the slide rail seat 39, a lifting cylinder 41 is arranged at the top and the bottom of the slide rail seat 39, the extending direction of a piston rod of the lifting cylinder 41 extends from the end part to the middle part of the slide rail seat 39, the piston rod of the lifting cylinder 41 is connected with a connecting block 42, a sliding groove matched with the third slide rail 40 is arranged on the back surface of the connecting block 42, a connecting rod 43 is arranged on the front surface of the connecting block 42, one end of the connecting rod 43 is hinged with the connecting block 42, a chamfering knife 44 is arranged at the other end of the connecting rod 43, the position of the chamfering knife 44 is aligned with the notch of the grooved part 10, a pressure rod 45 is arranged above the connecting rod 43, one end of the pressure rod 45 is connected with the connecting block 42, a long round hole is arranged at the other end of the pressure rod 45, and the pressure rod 45 is connected with the connecting rod 43 through a bolt penetrating through the long round hole, be equipped with spring 46 between depression bar 45 and the connecting rod 43, spring 46 cover is established on the bolt that passes the slotted hole, is equipped with thickness micromatic setting between two upper and lower connecting blocks 42, thickness micromatic setting include regulating plate 47, be equipped with regulating block 48 between regulating plate 47 and the connecting block 42.

When the chamfering device is used, firstly, a to-be-chamfered grooved part 10 is placed into a conveyor belt 15, the grooved part 10 is continuously transported on the conveyor belt 15, the grooved part 10 is firstly conveyed to a second stop block 9, a piston rod of a second limiting cylinder 12 is in an extending state to stop the grooved part 10 from continuously advancing, if signals of a first infrared emitter 13 and a first infrared receiver 14 are not blocked, the grooved part 10 does not exist at a first stop block 8, the piston rod of the second limiting cylinder 12 contracts, the grooved part 10 continuously conveys to the first stop block 8, similarly, if the grooved part 10 does not exist at a guide stop block 16, the piston rod of the first limiting cylinder 11 contracts, the grooved part 10 is conveyed to the guide stop block 16, then the grooved part 10 is pushed into a part fixing seat 28 by a conveying cylinder 18, a resetting cylinder 31 acts, a chamfering mechanism 38 advances, a chamfering tool 44 aligns to the initial position of a groove opening of the grooved part 10, the lifting cylinder 41 acts, the chamfering tool 44 abuts against the notch, the air cylinder 34 is pushed to act, the chamfering tool 44 moves forwards to perform chamfering, a thickness fine adjustment device is further arranged between the lifting cylinders 41 to prevent tool collision, and a pressure rod 45 and a spring 46 are arranged above the chamfering tool 44 to adjust the size of the chamfering.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.