Tool changer of processing machine

Abstract

The invention relates to a tool changing device of a processing machine, which comprises a tool changing arm connected on a fixed machine base and a transmission mechanism for driving the tool changing arm to pivot and swing. Wherein the transmission mechanism comprises a displacement cam, a driven piece and a rotating shaft, the surface of the displacement cam is provided with a curve groove, the driven piece is provided with a protruding part which is embedded into the curve groove, the driven piece is linked with the rotating shaft in a meshed mode, and the rotating shaft is connected with the tool changing arm. Therefore, when the displacement cam rotates, the driven piece is driven to translate, and the moving driven piece drives the rotating shaft to rotate and drives the tool changing arm to precisely pivot and position between two fixed points.

Description

Technical Field

[0001] The present invention relates to a machining center, and in particular to a tool changing device of the machining center. Background Art

[0002] It is known that machining centers equipped with tool magazines use automatic tool changing mechanisms to achieve the purpose of quickly replacing machining tools. The automatic tool changing mechanism includes a tool changing arm, which is composed of a tool arm connected to one end of a rotating shaft. When the rotating shaft is driven, the tool arm is driven to rotate to exchange tools. In addition, the entire set of tool changing arms of some models must be able to be controlled to pivot between two fixed points to adapt to different tool changing mechanisms, such as tool changing operations applied to vertical spindle heads or horizontal spindle heads.

[0003] A tool changing arm in a known tool changing mechanism is installed on a rotating seat that can be turned over within a range of 90 degrees. By controlling the turning of the rotating seat, the entire set of tool changing arms can be driven to move between two fixed points at angles of 0 and 90 degrees. However, the overall weight of the tool changing arm is not light. In order to smoothly and steadily drive the rotating seat to turn over, a known method is to use a hydraulic cylinder that can generate a large output power as a power source. However, using hydraulic means as a method to drive the rotating seat to turn over has the potential problem of inaccurate turning positioning of the rotating seat, and the hydraulic cylinder structure has the problem of hydraulic oil leakage and environmentally unfriendly subsequent treatment of hydraulic oil. In addition, it is also limited in use by the hydraulic oil temperature not being too high. Therefore, the existing tool changing mechanism that can move between two fixed points is not perfect and needs to be improved. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a tool changing device for a processing machine, which can ensure that the rotating seat is flipped and positioned accurately.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a tool changing device for a processing machine, which includes a fixed machine base, a transmission mechanism and a tool changing arm. The transmission mechanism is combined with the machine base and includes a displacement cam, a follower, a rotating shaft and a rotating seat; the displacement cam is controlled to rotate around a first axis, the surface of the displacement cam has a curved groove, the follower has a protrusion embedded in the curved groove, when the displacement cam rotates, the follower reciprocates along the first axis, the rotating shaft passes through the machine base and can rotate around a second axis, the part of the rotating shaft located on the inner side of the machine base is meshed with the follower, and the part of the rotating shaft located on the outer side of the machine base is fixedly connected to the rotating seat; the tool changing arm is connected to the rotating seat and can pivot between a first position and a second position.

[0006] The effect of the present invention is that the displacement cam is driven to drive the follower to translate, and the translated follower then drives the rotating shaft to rotate through meshing, and the rotating shaft can drive the tool changing arm to accurately pivot and position between two fixed points. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A three-dimensional diagram of a tool changing device for a processing machine according to a preferred embodiment of the present invention;

[0008] Figure 2 for Figure 1 An exploded view of a tool changing device of the processing machine shown;

[0009] Figure 3 for Figure 1 A front view of the tool changing device of the processing machine is shown, revealing that the tool changing arm is in a first position;

[0010] Figure 4 for Figure 2 An exploded view of some components of a tool changing device of the processing machine shown;

[0011] Figure 5 for Figure 4 The combination of the components shown and the three-dimensional view from another perspective;

[0012] Figure 6 for Figure 2 An exploded view of some components of the transmission mechanism in the tool changing device of the processing machine shown;

[0013] Figure 7 for Figure 6 An exploded view of the components shown;

[0014] Figure 8 for Figure 3 A simplified diagram of a transmission mechanism in a tool changing device of a processing machine is shown, revealing that a first abutting portion of a rotating seat contacts a stopper;

[0015] Fig. 9 Similar Figure 3 , revealing that the tool changing arm is in the second position;

[0016] Fig.10 Similar Figure 8 , revealing that the second abutment portion of the rotating seat contacts the stopper;

[0017] Fig.11 for Figure 8 The partial enlarged and cross-sectional view of the structure shown reveals the positional relationship between an angle detection module and a displacement cam;

[0018] Fig.12 is a three-dimensional diagram, revealing another positional relationship between the angle detection module and the transmission mechanism;

[0019] Fig.13 for Figure 1 An exploded view of some components of a tool changing device of the processing machine shown;

[0020] Fig.14 is a cross-sectional view, revealing the connection relationship between the transmission base and the vertical wall; and

[0021] Fig.15 for Figure 3 A partial enlarged view of the transmission mechanism in the tool changing device of the processing machine shown.

[0022]

Explanation of symbols

[0023] [The present invention]

[0024] 100: Tool changing device

[0025] 10: Base

[0026] 11: Base

[0027] 12: Wall

[0028] 12a: Positioning hole

[0029] 13: Convex wall

[0030] 14: Front cover

[0031] 15: Stopper

[0032] 15a: Resistance surface

[0033] 16: Constraint surface

[0034] 20: Tool changing arm

[0035] 21: Rotation axis

[0036] 22: Blade Arm

[0037] 23: Chassis

[0038] 24: Bolt

[0039] 30: Transmission mechanism

[0040] 31: Gear shaft

[0041] 32: Rotating shaft

[0042] 33: Intermediate gear

[0043] 34: Driven gear

[0044] 35: Rotating seat

[0045] 351:Piercing

[0046] 352: first contact portion

[0047] 353: Second contact portion

[0048] 36: Bolt

[0049] 37: Pipe blocking

[0050] 38: Transmission seat

[0051] 381:Right end plate

[0052] 382: Left end plate

[0053] 383: Front end plate

[0054] 384: Rear end plate

[0055] 384a: Long slot hole

[0056] 385: Shoulder

[0057] 386: screw hole

[0058] 39: Displacement cam

[0059] 391: Curved groove

[0060] 392: Side hole

[0061] 40: Motor

[0062] 41: Slider

[0063] 42: Linear rail

[0064] 43: Follower

[0065] 431: Tooth surface

[0066] 432: protrusion

[0067] 432a:Shaft

[0068] 432b: Head

[0069] 44: Positioning pin

[0070] 45:Front bearing

[0071] 46: Rear bearing

[0072] 47: Screw

[0073] 48: Screw

[0074] 48a: Sensing part

[0075] 50: Angle detection module

[0076] 51: Magnet

[0077] 51a: Sensing surface

[0078] 52: Angle sensor

[0079] 52a: Sensing surface

[0080] 53: Controller

[0081] 54: Fixed ring

[0082] 55: Angle detector

[0083] 56: Induction block

[0084] 56a: Sensing part

[0085] 57:Fixed plate

[0086] 58: Position detector

[0087] 59:Fixed plate

[0088] 60: First adjustment lever

[0089] 61: Second adjustment lever

[0090] 62: Fixed block

[0091] 63: U-shaped nut

[0092] L1: First axis

[0093] L2: Second axis

[0094] P1: First position

[0095] P2: Second position DETAILED DESCRIPTION

[0096] In order to more clearly illustrate the present invention, a preferred embodiment is given and described in detail with reference to the accompanying drawings. Figures 1 to 3 As shown, a preferred embodiment of the present invention is a tool changing device 100 for a processing machine, which is used to exchange a tool on a main shaft of a processing machine with a tool in a tool magazine. The tool changing device 100 comprises a stationary machine base 10, a tool changing arm 20 and a transmission mechanism 30, wherein the tool changing arm 20 comprises a rotating shaft 21 and a tool arm 22, one end of the rotating shaft 21 is connected to the tool arm 22, the tool arm 22 has two opposite ends and is used to clamp a tool rod (not shown), respectively, and the rotating shaft 21 can be driven to drive the tool arm 22 to rotate 180 degrees.

[0097] The transmission mechanism 30 is combined with the base 10 to drive the tool change arm 20 to move between two fixed points. In this embodiment, the transmission mechanism 30 can drive the tool change arm 20 to move between two fixed points at an angle of 0 degrees ( Figure 3 Reference) and 90 degrees ( Fig. 9The tool change arm 20 is reciprocated between two fixed points. It should be noted that the angles of the two fixed points are not limited to 0 degrees and 90 degrees, and can be adjusted according to actual needs. The following describes a specific structure that can achieve the movement of the tool change arm 20 between the two fixed points. The base 10 has a base 11 and a vertical wall 12 connected to the base 11. The side of the vertical wall 12 facing the tool change arm 20 is defined as the outer side, and the opposite side is defined as the inner side. The vertical wall 12 is provided with two convex walls 13 on one side of the inner side, and a front cover 14 is detachably connected to the two convex walls 13.

[0098] Please cooperate Figure 4 and Figure 5 As shown, the transmission mechanism 30 includes a gear shaft 31 , a rotating shaft 32 , an intermediate gear 33 , a driven gear 34 and a rotating base 35 . The two ends of the gear shaft 31 and the rotating shaft 32 are respectively passed through the vertical wall 12 and the front cover 14 and are rotatably arranged in parallel between the two convex walls 13; the intermediate gear 33 is sleeved on the gear shaft 31, and the driven gear 34 is sleeved on the rotating shaft 32, and the driven gear 34 and the rotating shaft 32 are able to be linked by providing a keyway and placing a key (not shown in the figure), and the intermediate gear 33 meshes with the driven gear 34 and its number of teeth is less than the number of teeth of the driven gear 34; the rotating seat 35 is arranged on the outer side of the vertical wall 12 of the machine base 10 and is fixedly connected to a chassis 23 of the tool changing arm 20 by a plurality of bolts 24, and the rotating seat 35 has a plurality of through holes 351 and is fixedly connected to the rotating shaft 32 by a plurality of bolts 36 that respectively pass through one of the through holes 351 and lock into one end of the rotating shaft 32 that passes through the vertical wall 12. When the rotating shaft 32 rotates, it can drive the rotating seat 35 and the tool changing arm 20 to flip together. In addition, the rotating shaft 32 is further provided with a blocking tube 37 at the portion where it passes through the vertical wall 12. The blocking tube 37 is located between the vertical wall 12 and the rotating seat 35 to prevent dust or debris in the working environment from accidentally falling between the rotating shaft 32 and the vertical wall 12 and hindering the smooth rotation of the rotating shaft 32.

[0099] Please cooperate again Figure 6 and Figure 7As shown, the transmission mechanism 30 further includes a transmission base 38, a displacement cam 39, a motor 40, a slider 41, a linear rail 42 and a follower 43. The transmission base 38 is connected to the vertical wall 12 of the machine base 10 through a plurality of positioning pins 44. The transmission base 38 has a right end plate 381 and a left end plate 382 separated by a distance, and a front bearing 45 and a rear bearing 46 are respectively disposed on the right end plate 381 and the left end plate 382; the displacement cam 39 is a cylindrical cam in this embodiment, and its two ends are respectively inserted into the front bearing 45 and the rear bearing 46, and is rotatably connected to the transmission base 38. A curved groove 391 is disposed on the surface of the displacement cam 39; the motor 40 is connected to the left end plate 382 of the transmission base 38, and can drive the displacement cam 39 to rotate around a first axis L1.

[0100] The slider 41, the linear rail 42 and the follower 43 are disposed between the intermediate gear 33 and the displacement cam 39, wherein the slider 41 is fixedly coupled to the vertical wall 12, the linear rail 42 cooperates with the slider 41 in a sliding pair, and the follower 43 is fixedly connected to the linear rail 42 by a plurality of screws 47. The top surface of the follower 43 has a tooth surface 431 arranged along the direction of the above-mentioned first axis L1, and the tooth surface 431 is meshed with the intermediate gear 33. The bottom surface of the follower 43 has a protrusion 432, and the protrusion 432 is embedded in the curved groove 391 of the displacement cam 39. In the present embodiment, the protrusion 432 is a shank bearing including a rod body 432a and a head 432b. One end of the rod body 432a is connected to the bottom surface of the follower 43, and the other end is connected to the head 432b. The head 432b is located in the curved groove 391. When the head 432b is designed in a rotatable manner, the contact wear with the curved groove 391 can be reduced. When the head 432b is designed in a non-rotatable manner, it forms an integrated structure with the rod body 432a to enhance its own stability.

[0101] The above is a structural description of the tool changing device 100 according to a preferred embodiment of the present invention, and its operation method is described below.

[0102] Please cooperate Figure 3 and Figure 8 As shown, the tool changing arm 20 is in an upright state, and the tool changing arm 20 in this state is defined as being located at a first position P1. Fig. 9 and Fig.10As shown, when the motor 40 is started to drive the displacement cam 39, the rotating displacement cam 39 pushes the protrusion 432 through its curved groove 391, and the follower 43 is constrained by the sliding cooperation between the slider 41 and the linear rail 42, and can only translate along the first axis L1 direction. At the same time, the tooth surface 431 of the follower 43 meshes with the intermediate gear 33, and the intermediate gear 33 meshes with the driven gear 34, and the rotating driven gear 34 drives the rotating shaft 32 to move along a second axis L2 ( Figure 4 Reference) as the center of rotation, so that the rotating seat 35 and the tool changing arm 20 can be driven to turn synchronously. When the tool changing arm 20 is pivoted to a horizontal position, the tool changing arm 20 in this state is defined to be located at a second position P2. Conversely, when the displacement cam 39 is controlled to reverse, the tool changing arm 20 can be pulled back to the first position P1. It is worth mentioning that the stroke length of the curved groove 391 of the displacement cam 39 is carefully designed so that the tool changing arm 20 can be pivoted between the first position P1 and the second position P2.

[0103] In addition, the present invention may further provide a limiting means to enable the tool changing arm 20 to be accurately positioned at the first position P1 or the second position P2. Figure 4 and Figure 5 As shown, the limiting means of this embodiment includes a stopper 15 disposed on the outer side of the vertical wall 12 of the machine base 10, the stopper 15 having a stopper surface 15a, and a first contact portion 352 and a second contact portion 353 are respectively disposed at two different points of the rotating base 35. When the first contact portion 352 contacts the upper part of the stopper surface 15a, the tool changing arm 20 is precisely positioned at the first position P1 ( Figure 3 and Figure 8 When the second abutting portion 353 contacts the lower portion of the abutting surface 15a, the tool changing arm 20 is precisely positioned at the second position P2 ( Fig. 9 and Fig.10Reference). In other words, based on the careful design of the curved groove 391, the setting of the stopper 15 can prevent the rotating seat 35 from excessive deflection, so as to ensure that the tool changing arm 20 is accurately positioned at the first position P1 or the second position P2. In a specific application example, the first abutting portion 352 and the second abutting portion 353 are a kind of bolt. By fine-tuning the depth of the bolt locked into the rotating seat 35, the first abutting portion 352 or the second abutting portion 353 can be made to contact the abutting surface 15a earlier or later, so that the tool changing arm 20 can obtain a precise positioning effect. It is also mentioned that the aforementioned embodiment is to set the abutting surface 15a on the machine base 10, and to set the first abutting portion 352 and the second abutting portion 353 on the rotating seat 35, but depending on actual needs, it is also possible to set the first abutting portion and the second abutting portion on the machine base, and set the abutting surface on the rotating seat.

[0104] In the above embodiment, electric control is used as the power source for driving the tool change arm 20 to pivot, that is, the motor 40 directly drives the displacement cam 39 to rotate forward and reverse, thereby driving the follower 43 to reciprocate along the first axis L1, so as to achieve the purpose of controlling the tool change arm 20 to pivot between two fixed points. This improves the existing problem of hydraulic oil leakage and environmentally unfriendly subsequent treatment of hydraulic oil when the hydraulic cylinder is used to drive the tool change arm to move between two fixed points, and the structure of the present invention is not restricted by the use of excessively high hydraulic oil temperature.

[0105] The above-mentioned follower 43 is linked to the driven gear 34 sleeved on the rotating shaft 32 located on the inner side of the machine base 10 in a meshing manner, so as to achieve the purpose of driving the tool changing arm 20 to pivot. In the above-mentioned embodiment, an intermediate gear 33 is arranged between the driven gear 34 and the tooth surface 431 of the follower 43. However, it should be noted that the number of intermediate gears is not limited to one, and can be increased depending on actual needs. In addition, it is not ruled out that the circumferential surface of the above-mentioned rotating shaft can be directly set as the tooth surface and directly mesh with the tooth surface of the follower, thereby omitting the setting of the intermediate gear.

[0106] The tool changing device of the present invention can be further provided with an angle detection module to detect the rotation angle of the displacement cam so as to control the motor to stop running in a timely manner. Figure 1 and Figure 6 As shown, the angle detection module 50 is mounted on the transmission base 38 of the tool changing device 100 of the above embodiment. Figure 7 and Fig.11As shown, the angle detection module 50 includes a magnet 51, an angle sensor 52 and a controller 53. The magnet 51 is located on an end surface of the displacement cam 39 through a fixing ring 54 inserted in a side hole 392 of the displacement cam 39, and can rotate with the rotation of the displacement cam 39. The angle sensor 52 is fixed on the right end plate 381 of the transmission base 38. The angle sensor 52 has a sensing surface 52a which is separated from a sensed surface 51a of the magnet 51 by a micro distance, wherein the micro distance is set between 1.5 mm and 3.5 mm, with a spacing of 2.5 mm being preferred. The sensing surface 52a senses the rotation angle change of the magnetic lines of force of the magnet 51 in a non-contact manner. When the rotation angle of the sensed magnetic lines of force (equivalent to the rotation angle of the displacement cam) meets the preset value, the controller 53 receives the signal generated by the angle sensor 52 and controls the motor 40 to stop running. The preset rotation angle value corresponds to the two fixed positions of the tool changing arm 20 at angles of 0 degrees and 90 degrees, that is, when the tool changing arm 20 reaches the first position P1 or the second position P2, the motor 40 stops running to avoid excessive pivoting of the tool changing arm 20.

[0107] In addition, the angle detection module can also be composed of two angle detectors and two sensing blocks, such as Fig.12 As shown, the two angle detectors 55 are a kind of proximity switch and are respectively connected to a fixed plate 57, and the fixed plate 57 is fixed to the right end plate 381 of the transmission seat 38; the two sensing blocks 56 are a kind of signal cam and are sleeved on one end of the displacement cam 39 in a manner that can rotate synchronously with the displacement cam 39. The two sensing blocks 56 respectively have a protruding sensing portion 56a, and each of the sensing portions 56a is staggered. When each of the angle detectors 55 detects a sensing portion 56a in time, a signal corresponding to the rotation angle is generated, and the signal is also used to control the motor 40 to stop running.

[0108] In addition, the tool changing device of the present invention can be further provided with two position detectors for detecting the position of the driven member. Fig.12Among them, the two position detectors 58 and the two angle detectors 55 are electrically connected to a controller (not shown), and the two position detectors 58 are respectively connected to a fixed plate 59 at intervals, and the aforementioned fixed plate 59 is fixed to a front end plate 383 of the transmission base 38, and one of the screws used to lock the follower 43 and the linear rail 42 is replaced by a screw 48 with a head, and the aforementioned head constitutes a sensed portion 48a. When the displacement cam 39 rotates and one of the angle detectors 55 sends a signal corresponding to the rotation angle, one of the two position detectors 58 will detect the sensed portion 48a on the translated follower 43 and generate a confirmation signal, so that it can be confirmed that the follower 43 has moved into place. On the contrary, if the angle detector 55 sends a signal corresponding to the rotation angle, but the position detector 58 does not send a corresponding confirmation signal, it means that the follower 43 cannot move to the position as expected. At this time, the controller will generate a warning signal as a fault reminder so that the obstacle can be removed in time. The above-mentioned position detector can also be used in conjunction with the angle detection module composed of a magnet and an angle sensor.

[0109] As can be seen from the above, the tool changing device 100 of the present invention can not only pivot within a preset range, but also be accurately positioned at the first position P1 or the second position P2 through the linkage relationship between the displacement cam 39, the follower 43, the intermediate gear 33 and the driven gear 34. In addition, in order to effectively eliminate the backlash, the present invention further provides a fine-tuning means that can drive the transmission seat 38 to move along the direction of the first axis L1. The fine-tuning means includes at least one adjustment rod, and the transmission seat 38 and the machine base 10 are matched in a sliding manner. Based on the displacement cam 39 being combined with the transmission seat 38, when the at least one adjustment rod is driven, the transmission seat 38 and the displacement cam 39 can be linked to move synchronously.

[0110] Please cooperate Figures 13 to 15 As shown, in one embodiment to achieve the above purpose, the machine base 10 is provided with two parallel restraining surfaces 16 on the inner surface of its vertical wall 12, and the transmission seat 38 is formed with a shoulder 385 along the upper and lower edges of a rear end plate 384 thereof, and the vertical wall 12 is provided with a plurality of positioning holes 12a, and the rear end plate 384 has a plurality of long slot holes 384a. When the transmission seat 38 is installed, the shoulder 385 cooperates with the restraining surface 16, and the positioning pins 44 are respectively passed through one of the long slot holes 384a and extended into the corresponding positioning holes 12a, so that the transmission seat 38 can be displaced along the direction of the first axis L1 within the long axial range of the long slot hole 384a. In one embodiment, the aforementioned positioning hole 12a is a screw hole, and the aforementioned positioning pin 44 is a bolt.

[0111] In addition, the at least one adjusting rod includes a first adjusting rod 60 and a second adjusting rod 61, for example, a bolt. In the present embodiment, the first adjusting rod 60 and the second adjusting rod 61 are arranged on the same side, wherein the first adjusting rod 60 is locked into a fixed block 62 fixedly connected to the vertical wall 12, and the fixed block 62 constitutes a fixed support point when the first adjusting rod 60 rotates. Therefore, when the first adjusting rod 60 is driven to move forward, the first adjusting rod 60 will push the transmission seat 38 to move in a first direction D1. The second adjustment rod 61 is directly locked into a screw hole 386 of the transmission seat 38, and one end of the second adjustment rod 61 abuts against the body of the positioning pin 44. Since one end of the positioning pin 44 extends into the positioning hole 12a, when the second adjustment rod 61 is driven, the positioning pin 44 in contact with the second adjustment rod 61 constitutes a fixed support point. When the second adjustment rod 61 continues to be locked into the screw hole 386, the transmission seat 38 is pulled and displaced in a second direction D2 opposite to the first direction D1. At this point, the displacement cam 39 is synchronously moved.

[0112] In the above, the displacement cam 39 that moves synchronously with the transmission seat 38 will push the follower 43 to move through the protrusion 432, which is beneficial to eliminate the tooth gap and can also achieve the purpose of fine-tuning the swing direction of the entire set of the tool change arm 20. It should be noted that in other embodiments, the first adjustment rod 60 and the second adjustment rod 61 can also be set on the opposite side, that is, respectively located on the outside of the right end plate 381 and the left end plate 382; in addition, a U-shaped nut 63 can be locked on the first adjustment rod 60 and the second adjustment rod 61 respectively to ensure that the first adjustment rod 60 and the second adjustment rod 61 are positioned accurately.

[0113] 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 tool changing device for a processing machine, characterized in that: Include: A fixed base; A transmission mechanism is combined with the base and includes a displacement cam, a follower, a rotating shaft and a rotating base; wherein the displacement cam is controlled to rotate around a first axis, the surface of the displacement cam has a curved groove, the follower has a protrusion embedded in the curved groove, when the displacement cam rotates, the follower reciprocates along the first axis, the rotating shaft passes through the base and can rotate around a second axis, the part of the rotating shaft located inside the base is meshed with the follower, and the part of the rotating shaft located outside the base is fixed to the rotating base; and A tool changing arm is connected to the rotating seat and can pivot between a first position and a second position.

2. The tool changing device for a processing machine according to claim 1, characterized in that: The transmission mechanism includes a driven gear, the driven gear is sleeved on the rotating shaft, the driven member has a tooth surface arranged along the first axis direction, the driven member drives the driven gear in a meshing manner through its tooth surface, and the driven gear drives the rotating shaft to rotate.

3. The tool changing device for a processing machine according to claim 2, characterized in that: The transmission mechanism comprises at least one intermediate gear, the tooth surface of the driven member meshes with the intermediate gear, the at least one intermediate gear meshes with the driven gear, and the number of teeth of the at least one intermediate gear is less than the number of teeth of the driven gear.

4. The tool changing device for a processing machine according to claim 1, characterized in that: The transmission mechanism comprises a linear rail and a slider, one of the linear rail and the slider is fixedly connected to the machine base, and the other is fixedly connected to the driven member, and the linear rail and the slider are matched in a sliding manner.

5. The tool changing device for a processing machine according to claim 1, characterized in that: The transmission mechanism includes a transmission seat, which is combined with the machine base. The displacement cam is rotatably arranged on the transmission seat. The tool changing device includes a fine-tuning means, which is used to drive the transmission seat to displace along the direction of the first axis.

6. The tool changing device for a processing machine according to claim 5, characterized in that: The fine-tuning means comprises at least one adjusting rod, and the transmission seat is matched with the machine seat in a sliding manner, and the at least one adjusting rod is driven to rotate to link the transmission seat to move.

7. The tool changing device for a processing machine according to claim 6, characterized in that: The transmission seat has a plurality of long slot holes, the machine base has a plurality of positioning holes, and a plurality of positioning pins respectively pass through one of the long slot holes and extend into the corresponding positioning holes; the at least one adjusting rod includes a first adjusting rod and a second adjusting rod, wherein the first adjusting rod is driven to rotate and links the transmission seat to move in a first direction, and the second adjusting rod is driven to rotate and links the transmission seat to move in a second direction, and the first direction is opposite to the second direction.

8. The tool changing device for a processing machine according to claim 1, characterized in that: The transmission mechanism includes a transmission seat and a motor, the transmission seat is combined with the machine base, the displacement cam is arranged on the transmission seat, and the motor is combined with the transmission seat and used to drive the displacement cam to rotate; the tool changing device includes an angle detection module, which is combined with the transmission seat to detect the rotation angle of the displacement cam.

9. The tool changing device for a processing machine according to claim 8, characterized in that: The angle detection module includes a magnet and an angle sensor. The magnet is arranged on an end surface of the displacement cam and rotates with the rotation of the displacement cam. The angle sensor is fixed to the transmission seat and senses the rotation angle of the magnetic lines of force of the magnet in a non-contact manner and generates a signal, which controls the motor to stop running.

10. The tool changing device for a processing machine according to claim 8, characterized in that: The angle detection module includes two angle detectors arranged on the transmission seat, and two sensed parts which can rotate synchronously with the displacement cam are arranged on the displacement cam. Each of the angle detectors detects one of the sensed parts and generates a signal, and the signal controls the motor to stop running.

11. The tool changing device for a processing machine according to claim 9 or 10, characterized in that: It includes two position detectors arranged on the transmission seat and a sensed part arranged on the driven member. Each of the position detectors is electrically connected to the angle detection module, and when the angle detection module sends the signal, the sensed part on the driven member is detected and a confirmation signal is generated.

12. The tool changing device for a processing machine according to claim 1, characterized in that: A limiting means is included to position the tool changing arm at the first position or the second position.

13. The tool changing device for a processing machine according to claim 12, characterized in that: The limiting means includes a stop surface on the machine base, and a first stop portion and a second stop portion on the rotating base, wherein when the first stop portion contacts the stop surface, the tool changing arm is located at the first position, and when the second stop portion contacts the stop surface, the tool changing arm is located at the second position.

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