Mechanical origin setting structure of cam mechanism of automatic tool changing system and method thereof

Abstract

The invention relates to a mechanical origin setting structure and method of a cam mechanism of an automatic tool changing system, which is characterized in that a fixed alignment part is arranged on a machine body, a reference part is arranged on a rotating piece of the cam mechanism, the reference part can do circular track displacement around a central axis along with the rotation of the rotating piece, and in addition, the mechanical origin setting structure of the cam mechanism of the automatic tool changing system is arranged on the reference part. A positioning rod is selectively used for penetrating through the alignment part and driving the rotating piece to rotate, and when one end of the positioning rod is aligned with the reference part, the mechanical origin of the cam mechanism is set. According to the structure and the method, original point setting can be rapidly and accurately completed, and the defect caused by hidden parallax when detection is conducted in an existing visual mode is overcome.

Description

Technical Field

[0001] The present invention relates to an automatic tool changing mechanism of a numerically controlled machine tool, and in particular to a mechanical origin setting structure and method of a cam mechanism of the automatic tool changing system. Background Art

[0002] Figure 1 The figure shows an automatic tool changer (ATC) system of a known CNC machine tool, which can quickly exchange tools located in a tool magazine and a processing spindle, thereby improving work efficiency. The aforementioned automatic tool changer system generally includes a body 1, a motor 2, and a tool changer arm 3, as well as a cam mechanism and a rotating shaft (not shown) disposed inside the body 1. One end of the rotating shaft protrudes out of the body 1 and is connected to the tool changer arm 3. Both ends of the tool changer arm 3 can engage with tools. When the motor 2 drives the cam mechanism to operate, the cam mechanism can link the rotating shaft to rotate and drive the rotating shaft to move up and down, so as to control the tool changer arm 3 to realize tool change sequences such as rotating to engage the tool, descending, rotating to change the tool, ascending, and rotating to return to the original position, so as to achieve the purpose of tool exchange.

[0003] The existing automatic tool changing system must go through the mechanical origin setting when the new machine leaves the factory to ensure the smooth execution of the tool changing operation. The aforementioned mechanical origin refers to a fixed point that must be adjusted in advance when the automatic tool changing system is assembled. It is the reference point of the processing machine when processing, and it is generally not allowed to be changed arbitrarily. In the automatic tool changing system, the mechanical origin is set at the zero position on a working curve of the cam mechanism. Therefore, when the automatic tool changing system stops abnormally during operation, or an accidental event causes the cam mechanism to stay at any position other than the mechanical origin, the mechanical origin must be reset so that the tool changing operation can be performed again. The known method of mechanical origin reset setting is to first turn off the main power of the machine, and use the ejector pin 4a of a gauge 4 to contact the tool changing arm 3 ( Figure 1 and Figure 2 Reference), then release the brake of the motor 2, and then use a wrench to rotate a spindle 2a of the motor 2 to indirectly force the tool changing arm 3 to move, and visually observe the value corresponding to the pointer 4b of the gauge 4 to determine whether the mechanical origin of the cam mechanism has returned to the zero position.

[0004] It is true that the above-mentioned detection method using the gauge 4 can help the relevant personnel to perform the mechanical origin reset setting. However, when the relevant personnel visually inspect the value corresponding to the pointer 4b on the gauge 4, it is easy for the relevant personnel's eyes to look directly in the direction of the vertical projection of the pointer 4b, so there is a dislocation parallax. This situation will cause the mechanical origin to fail to accurately return to the zero point position, which affects the accuracy of the tool change operation. In addition, since the reading error value caused by the above-mentioned dislocation parallax may not be large, it is often ignored by the relevant personnel, resulting in the inconvenience of the accurate execution of the tool change operation. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a mechanical origin setting structure and method of a cam mechanism of an automatic tool changing system, which can quickly and accurately complete the origin setting and improve the defects caused by potential parallax during visual inspection.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a mechanical origin setting structure of a cam mechanism of an automatic tool changing system, wherein the automatic tool changing system comprises a machine body and a rotating shaft, wherein the cam mechanism is arranged inside the machine body, wherein the cam mechanism comprises a rotating member, wherein the rotating member is driven to rotate around an axis, wherein the rotating shaft passes through the machine body, wherein the rotating member rotates in conjunction with the rotating shaft; wherein the machine body has a fixed alignment portion; the rotating member has a cam profile and defines that the cam profile has a working curve, wherein the working curve has a zero point position; and the rotating member further has a reference portion.

[0007] The present invention further provides a method for setting the mechanical origin of a cam mechanism of an automatic tool changing system, wherein the automatic tool changing system comprises a machine body, a rotating part and a motor, wherein the machine body has an alignment portion, the rotating part is arranged inside the machine body and has a reference portion, and the motor is used to drive the rotating part to rotate around an axis; the setting method is performed in a stopped state, and the steps include: driving a spindle of the motor to link the rotation of the rotating part, and the reference portion on the rotating part rotates around the axis; when the reference portion moves to the projection direction of the alignment portion of the machine body and overlaps with the alignment portion, a digital origin is set for a digital program built into a controller, wherein the digital program can control the automatic tool changing system to perform a tool changing action.

[0008] The effect of the present invention is that when the alignment portion overlaps with the reference portion in the projection direction, the zero point position of the cam profile of the rotating part of the cam mechanism is determined, and by setting the mechanical origin, the initial position of a tool changing arm can be consistent with the digital origin in the digital program of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a three-dimensional diagram of the existing automatic tool changing system;

[0010] Figure 2 for Figure 1 A top view of the automatic tool changing system shown;

[0011] Figure 3 An exploded view of an automatic tool changing system including a mechanical origin setting structure of a cam mechanism according to a preferred embodiment of the present invention;

[0012] Figure 4 for Figure 3 A three-dimensional diagram of another perspective of the automatic tool changing system shown;

[0013] Figure 5 for Figure 3 The automatic tool changing system shown is a front view omitting the cam box;

[0014] Figure 6 for Figure 3 A top view of a cam mechanism in the automatic tool changing system shown;

[0015] Figure 7 for Figure 3 An exploded view of a rotating part in a cam mechanism of an automatic tool changing system;

[0016] Figure 8 This is a simple diagram to reveal the relationship between the angle detection module, the controller and the setting device in the automatic tool changing system of the preferred embodiment of the present invention;

[0017] Fig. 9 It is a rotation timing diagram, revealing the relationship between the camshaft rotation angle and the tool change arm rotation angle;

[0018] Fig.10 It is a flow chart of a method for setting the mechanical origin of a cam mechanism of an automatic tool changing system in the above preferred embodiment of the present invention;

[0019] Fig.11 for Figure 4 An enlarged view of some components of the automatic tool changing system shown;

[0020] Fig.12 for Fig.11 a side view of the structure shown;

[0021] Fig.13 is a cross-sectional view showing that one end of the positioning rod of the auxiliary means is not inserted into the recess of the flat cam; and

[0022] Fig.14 It is a cross-sectional view, revealing that one end of the positioning rod of the auxiliary means is inserted into the recess of the flat cam.

[0023]

Explanation of symbols

[0024] 10: Body

[0025] 12: Cam box

[0026] 14: Capping

[0027] 14a: Perforation

[0028] 16: Bearing

[0029] 20: Motor

[0030] 22: Mandrel

[0031] 24: Bevel gear

[0032] 30: Rotating shaft

[0033] 32: Turret

[0034] 32a: Roller

[0035] 34: Tool changing arm

[0036] 40: Cam mechanism

[0037] 42: Camshaft

[0038] 44: Rotating parts

[0039] 441: Flat Cam

[0040] 441a: Side

[0041] 441b: Curved groove

[0042] 441c:Dimple

[0043] 441d: Bevel gear

[0044] 442: cambered cam

[0045] 442a: Cam profile

[0046] 50: Angle detection module

[0047] 52: Magnet

[0048] 54: Angle sensor

[0049] 60: Controller

[0050] 62: Wire

[0051] 70: Setting tool

[0052] 80: Auxiliary means

[0053] 81: Axle tube

[0054] 81a: Tube body

[0055] 81b: retaining ring

[0056] 81c: shaft hole

[0057] 81d: Shoulder

[0058] 82: Elastic parts

[0059] 83: Positioning rod

[0060] 83a: Action end

[0061] 83b: Positioning end

[0062] 84: Stopper

[0063] 85: Bolt

[0064] F: Force

[0065] L: Axis

[0066] S: Empty travel section DETAILED DESCRIPTION

[0067] The automatic tool changing system is a device on a CNC machine tool that can quickly replace the tools on the machine tool to achieve the purpose of machine tool automation. Specifically, after receiving the tool changing command, the tool magazine will first move the tool to be used to a tool change position, and then the tool changing arm of the automatic tool changing system will take out the tool from the tool change position, and after the tool changing sequence between the tool magazine and the machining spindle, such as rotating the tool, descending, rotating the tool, rising, and rotating the tool return, the tool to be used will be replaced on the machining spindle. The aforementioned tool changing sequence must be effectively controlled to drive the tool changing arm to accurately perform each tool changing action. For this reason, the automatic tool changing system is composed of not only a mechanical tool changing mechanism, but also an electronic controller, which has a built-in digital program to control the tool changing mechanism to perform tool changing actions.

[0068] In order to ensure that the tool changing operation can be performed smoothly and accurately, the automatic tool changing system must go through the setting of the mechanical origin when the new machine leaves the factory. The aforementioned mechanical origin refers to a fixed point that must be adjusted in advance during the assembly process of the automatic tool changing system. It is the reference point of the machine tool when processing. By setting the mechanical origin, the initial position of the tool changing arm of the tool changing mechanism can be consistent with the digital origin in the digital program of the controller, so that when the controller executes the digital program later, it can coordinate with the mechanical actuation of the tool changing mechanism. The present invention is created for the mechanical origin setting of a cam mechanism in the automatic tool changing system. In order to more clearly illustrate the present invention, a preferred embodiment is given and described in detail with the accompanying drawings as follows.

[0069] Please refer to Figures 3 to 6As shown, the automatic tool changing system of this embodiment includes a machine body 10 , a motor 20 , a rotating shaft 30 , a cam mechanism 40 , an angle detection module 50 and a controller 60 .

[0070] The body 10 includes a cam box 12 and a cover 14. The cover 14 is detachably connected to the cam box 12 and has a through hole 14a that passes through the front and rear sides of the cover. The through hole 14a constitutes a fixed alignment portion defined in the present invention. The motor 20 is mounted on the top of the cam box 12 and has a spindle 22. A portion of the spindle 22 protrudes outside the motor housing 20, and another portion extends into the cam box 12 and is connected to a bevel gear 24. The rotating shaft 30 passes through the cam box 12 in an upright manner and a turret 32 ​​is set in the middle section. One end of the rotating shaft 30 passes downward through the cam box 12 and is connected to a tool changing arm 34. The rotating shaft 30 is linked by the turret 32 ​​to produce rotation and straight movement, thereby driving the tool changing arm 34 to realize tool changing actions such as rotating to lock the tool, descending (the tool changing arm 34 does not rotate at this time), rotating to change the tool, ascending (the tool changing arm 34 does not rotate at this time) and rotating to return to the original position.

[0071] The cam mechanism 40 is disposed inside the cam box 12 and is shielded by the cover 14. The cam mechanism 40 includes a cam shaft 42 and a rotating member 44, wherein the cam shaft 42 passes through the rotating member 44 in a manner that it cannot rotate relative to the rotating member 44. The two ends of the cam shaft 42 are respectively inserted into the cam box 12 and the cover 14, and a bearing 16 is respectively disposed between the cam box 12 and the cover 14 so that the cam shaft 42 can rotate in place. The cam shaft 42 defines an axis L. In this embodiment, the rotating member 44 is composed of a flat cam 441 and a globoidal indexing cam 442. The flat cam 441 and the globoidal indexing cam 442 are fixedly connected as a whole and are passed through by the cam shaft 42. Figure 7 As shown, the flat cam 441 has a side surface 441a, and the cam shaft 42 passes through the side surface 441a. The side surface 441a is engraved with a closed path curved groove 441b, and has a concave cavity 441c near the periphery to constitute the reference portion defined in the present invention. In addition, the flat cam 441 has a bevel gear portion 441d on the other side facing away from the side surface 441a, and the bevel gear portion 441d meshes with the bevel gear 24 ( Figure 5 The arcuate cam 442 has a cam profile 442a, and the cam profile 442a cooperates with the roller 32a of the turret 32 ​​to be able to link each other.

[0072] Please cooperate Figure 3 and Figure 8As shown, the angle detection module 50 includes a magnet 52 and an angle sensor 54. The magnet 52 is arranged on an end surface of the camshaft 42 and is located at a position where the axis L passes. The magnet 52 can rotate with the camshaft 42; the angle sensor 54 is fixed to the cam box 12 and senses the change of the magnetic field lines of the magnet 52 in a non-contact manner, and generates a signal corresponding to the rotation angle of the camshaft 42. The rotation angle of the camshaft 42 is closely related to the tool changing timing of the tool changing arm 34 to realize the tool locking, descending, rotating tool changing, rising and rotating return.

[0073] The controller 60 is disposed in a machine box (not shown) and is electrically connected to the angle sensor 54 through a wire 62. The controller 60 has a built-in digital program for controlling the automatic tool changing system to perform a tool changing action. The controller 60 receives the signal generated by the angle sensor 54 and controls the mechanical and electrical systems of the machine tool to perform a tool changing action according to the received signal, such as controlling the motor 20 to start or stop.

[0074] The above is a structural description of the automatic tool changing system of the preferred embodiment of the present invention. When the motor 20 is started to drive the spindle 22 to rotate, the spindle 22 engages the bevel gear 441d through the bevel gear 24 to drive the flat cam 441 and the arc cam 442 to rotate synchronously, that is, the rotating member 44 drives the cam shaft 42 to rotate around the axis L. The rotating rotating member 44 will drive a rocker arm (not shown) through the curved groove 441b of its flat cam 441, and the rocker arm will drive the rotating shaft 30 to move vertically up and down. At the same time, the cam profile 442a of the arc cam 442 of the rotating member 44 will guide the roller 32a of the turret 32 ​​to force the rotating shaft 30 to rotate. From the above, it can be seen that the rotating rotating member 44 can drive the rotating shaft 30 to produce rotation and linear movement, thereby driving the tool changing arm 34 to perform actions such as rotating tool locking, descending, rotating tool changing, rising and rotating return; in addition, it should be noted that when the aforementioned rotating member 44 rotates, the recess 441c (i.e., the reference portion) on the side 441a of its flat cam 441 will rotate around the axis L as the center, and the rotation trajectory (circular trajectory) of the recess 441c passes through the vertical projection direction of the through hole 14a (i.e., the alignment portion) of the cover 14, and the aforementioned vertical projection direction refers to the direction parallel to the axis L and perpendicular to the surface of the cover 14.

[0075] The cam profile 442a of the arc cam 442 is used to control the shaft 30 to drive the tool changing arm 34 to rotate or not rotate in a timely manner during the tool changing sequence. Therefore, it is designed in a compound curve groove manner. The compound curve groove of the cam profile 442a is defined as having a working curve. The working curve is converted into Fig. 9The rotation timing diagram shown in the figure, wherein the X-axis of the rotation timing diagram represents the rotation angle of the camshaft, and the Y-axis represents the rotation angle of the tool changing arm. The working curve in the rotation timing diagram has a zero position, and the zero position represents that the rotation angle of the camshaft 42 is 0 degrees, that is, it represents the initial position of the tool changing arm 34. It is worth mentioning that the position of the recess 441c (reference portion) on the aforementioned flat cam 441 is referenced to the zero position of the working curve and is engraved at a specific position on the side 441a after calculation. In the rotation timing diagram, the straight lines of the timings A, C, and E represent that the rotating shaft 30 does not rotate, and the oblique lines of the timings B, D, and F represent that the rotating shaft 30 rotates. Specifically, when the rotating shaft 30 is at timing A, its roller 32a is located at an idle stroke section S ( Figure 7 ), the rotating member 44 will not drive the rotating shaft 30 to rotate, and the aforementioned idle stroke section S is commonly referred to as the "origin interval" in the industry. The rotating shaft 30 then rotates, does not rotate, rotates, does not rotate, and rotates in the corresponding timing sequences B, C, D, E, and F, and the curved groove 441b of the flat cam 441 is used to link the rotating shaft 30 to move up and down, so as to realize the tool changing actions such as the tool changing arm rotating to lock the tool, descending (the tool changing arm does not rotate), rotating to change the tool, ascending (the tool changing arm does not rotate), and rotating to return to the original position.

[0076] As can be seen from the above, the confirmation of the zero point position is related to whether the tool changing action of the tool changing arm 34 can be accurately performed. The following describes how to set the mechanical origin of the cam mechanism 40. Fig.10 As shown, the method for setting the mechanical origin is performed when the machine tool is stopped, including first turning off the motor 20; then using an auxiliary tool (such as a wrench) to engage the part of the spindle 22 protruding from the housing of the motor 20, and slowly driving the spindle 22, and the spindle 22 drives the rotating member 44 to rotate in a meshing transmission manner. When the recess 441c rotates around the axis L as the center along with the rotating member 44 that is rotated in a linked manner, and the recess 441c (reference part) moves to the vertical projection direction of the through hole 14a (alignment part) on the cover 14 of the machine body 10 and overlaps with the through hole 14a, it means that the zero point position on the cam profile 442a of the rotating member 44 is determined, that is, the mechanical origin of the cam mechanism 40 returns to the zero point position. When it is confirmed that the recess 441c (reference portion) on the rotating member 44 of the cam mechanism 40 is adjusted to the correct zero position, we can electrically connect a setting device 70 ( Figure 8Reference) to set the digital origin of the digital program of the controller 60, so that the initial position of the tool change arm 34 can be consistent with the digital origin in the digital program of the controller 60, so that when the controller 60 executes the digital program later, it can be coordinated with the mechanical actuation of the tool change mechanism. It must be explained that the aforementioned setter 70 is not a standard configuration of the automatic tool change system. It is mainly used by the manufacturer in the routine inspection procedure before the new machine leaves the factory. Of course, if the user has such a requirement, the setter 70 can also be shipped together with the automatic tool change system.

[0077] The above description shows that when the recess 441c and the through hole 14a overlap in the vertical projection direction, it means that the mechanical origin of the cam mechanism 40 returns to the zero position. In order to further ensure that the recess 441c and the through hole 14a can accurately overlap in the vertical projection direction, the present invention provides an auxiliary means to achieve the above purpose. Figures 11 to 13 As shown, the auxiliary means 80 includes a shaft tube 81, an elastic member 82, a positioning rod 83 and two stoppers 84, wherein the shaft tube 81 has a tube body 81a and a stop ring 81b connected to one end of the tube body 81a, an axial hole 81c passes through the stop ring 81b and the tube body 81a, and a shoulder portion 81d is formed on the hole wall of the shaft hole 81c, that is, the hole diameter of the shaft tube 81 at the shoulder portion 81d is smaller than the hole diameter of the shaft hole 81c at other parts; the elastic member 82 is a spring The elastic member 82 is arranged in the shaft hole 81c of the shaft tube 81, and one end of the elastic member 82 abuts against the shoulder portion 81d; the positioning rod 83 is a round rod, and its two different ends respectively constitute an action end 83a and a conical positioning end 83b, and the positioning rod 83 passes through the elastic member 82 and the shaft hole 81c; the two stoppers 84 are a kind of C-shaped ring and are respectively buckled on the positioning rod 83 close to the action end 83a and the positioning end 83b, and the aforementioned stoppers 84 constitute the limiting portion defined in the present invention. From the aforementioned combination relationship, it can be known that the other end of the elastic member 82 abuts against one of the stoppers 84 and pushes the positioning rod 83 to move in the direction away from the flat cam 441, and the other stopper 84 can timely abut against one end face of the shaft tube 81, so that the positioning rod 83 cannot be separated from the shaft tube 81. The shaft tube 81 , the elastic member 82 , the positioning rod 83 and the stopper 84 are assembled in a modular manner, so as to properly store and prevent the parts from being scattered.

[0078] When the auxiliary means 80 is used to set the mechanical origin of the cam mechanism 40, the tube body 81a of the shaft tube 81 is first passed through the through hole 14a of the cover 14, and when the retaining ring 81b abuts against the surface of the cover 14, two bolts 85 are respectively passed through the retaining ring 81b and locked into the cover 14, so that the shaft tube 81 is fixedly connected to the cover 14. Next, a force F is applied to the action end 83a of the positioning rod 83, so that the positioning rod 83 moves toward the flat cam 441, and the positioning end 83b lightly abuts against the side surface 441a, as shown in FIG. Fig.14 As shown, when the spindle 22 is driven to force the flat cam 441 to rotate and change the position of the recess 441c, when the recess 441c moves to the vertical projection direction of the through hole 14a and the positioning end 83b falls on the recess 441c, it means that the setting of the mechanical origin is completed. After that, the digital origin of the digital program of the controller 60 can be set in conjunction with the use of the setter 70, so that the initial position of the tool changing arm 34 is consistent with the digital origin in the digital program of the controller 60. It is worth mentioning that the pressing of the positioning rod 83 and the driving of the spindle 22 can be performed by different people separately, or by the same person with both hands, which is convenient. In addition, the aforementioned shaft tube 81, elastic member 82, positioning rod 83, stopper 84 and bolt 85 can be designed in a modular manner and be independent of the machine body 10 for storage by the manufacturer, or they can be directly combined with the machine body 10 and shipped randomly. Regardless of the method, they are suitable for setting the mechanical origin of a new machine before it leaves the factory, or for adjustment when the cam mechanism of the user's automatic tool changing system stays at a non-mechanical origin due to an accidental event.

[0079] In addition, in addition to the aforementioned method of using the bolt 85 as a fastener to fix the shaft tube 81 to the cover 14, the through hole 14a of the cover 14 can also be made into a screw hole, and then the outer wall of the tube body 81a of the shaft tube 81 is processed into an external thread, and the bolt 85 is omitted by screwing together, which can also achieve the same purpose. It is also mentioned that the auxiliary means can be only one positioning rod. On the basis that the diameter of the positioning rod is equivalent to the diameter of the through hole of the cover, the positioning rod can be directly passed through the through hole, and the setting is completed when one end of the positioning rod is against the recess.

[0080] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the scope of patent application should be included in the patent scope of the present invention.

Claims

1. A mechanical origin setting structure of a cam mechanism of an automatic tool changing system, the automatic tool changing system comprising a machine body and a rotating shaft, the cam mechanism being arranged inside the machine body, the cam mechanism comprising a rotating member, the rotating member being driven to rotate around an axis, the rotating shaft passing through the machine body, wherein the rotating member rotates in conjunction with the rotating shaft; characterized in that: The machine body has a fixed positioning part; The rotating member has a cam profile and the cam profile is defined as a working curve, the working curve has a zero point position; the rotating member also has a reference portion; Thereby, when the alignment portion and the reference portion overlap in the projection direction, the zero point position of the cam profile of the rotating member of the cam mechanism is determined.

2. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system according to claim 1, characterized in that: An auxiliary means is included, and the auxiliary means is used to make the alignment part and the reference part overlap in a vertical projection direction.

3. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system according to claim 2, characterized in that: The auxiliary means includes a positioning rod; the body includes a cam box and a cover, the cover is combined with the cam box and has a through hole to constitute the alignment part; the rotating part of the cam mechanism has a side surface, and the side surface has a recess to constitute the reference part; when the positioning rod passes through the through hole and one end abuts against the recess, the alignment part and the reference part overlap in the vertical projection direction.

4. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system according to claim 3, characterized in that: The auxiliary means includes an axle tube and an elastic member, wherein the axle tube is fixedly connected to the cover and is located in the through hole, the axle tube has an axle hole and a shoulder portion formed on the hole wall of the axle hole, the elastic member is located in the axle hole and one end abuts the shoulder portion, the positioning rod passes through the elastic member and the axle hole, and the two ends of the positioning rod respectively constitute a limiting portion, wherein one of the limiting portions abuts against the other end of the elastic member, and the other limiting portion can contact the axle tube so that the positioning rod cannot be detached from the axle tube.

5. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system as claimed in claim 3, characterized in that: The automatic tool changing system includes an angle detection module, which includes a magnet and an angle sensor; the cam mechanism includes a camshaft, which passes through the side of the rotating part and has two ends respectively inserted into the cam box and the cover; wherein the magnet is arranged on an end surface of the camshaft, and the angle sensor is fixed to the cam box, wherein the rotating part drives the camshaft to rotate, and the camshaft drives the magnet to rotate, and the angle sensor senses the change of the magnetic field line of the magnet in a non-contact manner and generates a signal corresponding to the rotation angle of the camshaft.

6. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system according to claim 5, characterized in that: The automatic tool changing system includes a controller and a setter. The controller receives the signal generated by the angle sensor and controls the automatic tool changing system to perform tool changing actions through a built-in digital program. The setter is electrically connected to the controller and can set the digital origin of the digital program of the controller when the alignment part and the reference part overlap in the projection direction.

7. The mechanical origin setting structure of the cam mechanism of the automatic tool changing system as claimed in claim 3, characterized in that: The rotating part of the cam mechanism includes a flat cam and an arc cam, the flat cam is fixedly connected to the arc cam, and the cam mechanism also includes a cam shaft, which has the axis and passes through the flat cam and the arc cam, wherein the flat cam has the side surface and the recess, and the arc cam has the cam profile.

8. A method for setting the mechanical origin of a cam mechanism of an automatic tool changing system, characterized in that: The automatic tool changing system comprises a machine body, a rotating member and a motor, wherein the machine body has a positioning portion, the rotating member is arranged inside the machine body and has a reference portion, and the motor is used to drive the rotating member to rotate around an axis as the center; the setting method is performed in a stopped state, and the steps include: A spindle of the motor is driven to rotate to link the rotating member, and the reference part on the rotating member rotates around the axis; When the reference part moves to the projection direction of the alignment part of the machine body and overlaps with the alignment part, a digital origin is set for a digital program built into a controller, wherein the digital program can control the automatic tool changing system to perform a tool changing action.

9. The method for setting the mechanical origin of the cam mechanism of the automatic tool changing system according to claim 8, characterized in that: The alignment part is a through hole, and the reference part is a recess. The method includes inserting a positioning rod into the through hole, and when one end of the positioning rod abuts against the recess, the alignment part and the reference part overlap in a vertical projection direction.

10. The method for setting the mechanical origin of the cam mechanism of the automatic tool changing system according to claim 8 or 9, characterized in that: The method comprises using a setting device which is electrically connected to the controller and can set the digital origin of the digital program of the controller when the alignment part and the reference part overlap in the projection direction.

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