Tool changing arm of automatic tool changing mechanism

Abstract

A tool changing arm of an automatic tool changing mechanism is characterized in that a tool buckling arm is formed at each of two ends of a long body, and each tool buckling arm is matched with a tool locking unit to buckle a tool bar. The cutter locking unit comprises a positioning seat, a cutter locking rod and a pushing piece, the positioning seat is arranged in a groove channel of the long body and is provided with a through hole and a blocking face, the cutter locking rod is arranged in the groove channel and partially passes through the through hole, the cutter locking rod keeps moving towards the direction of the cutter rod under the action of the pushing piece, and the blocking face is arranged on the blocking face. And the cutter locking rod is provided with a positioning surface which can be in contact with the blocking surface, so that the cutter locking rod is prevented from being disengaged from the long body improperly. Therefore, smooth action of the cutter locking rod can be ensured, and more grooves or holes for generating a limiting effect do not need to be processed and manufactured on the long body and the cutter locking rod.

Description

Technical Field

[0001] The present invention relates to an automatic tool changing mechanism, and in particular to a tool changing arm for engaging a tool rod to perform a tool changing procedure. Background Art

[0002] The tool changing arm of the known automatic tool changing mechanism of a machine tool includes an elongated body, and a tool locking portion is respectively provided at the opposite ends of the elongated body. The tool locking portion is mainly composed of a tool locking arm and a tool locking rod. The tool locking arm is connected to the elongated body and has a lateral opening. The tool locking rod can be inserted into an axial hole of the elongated body in a translational manner and one end protrudes into the lateral opening. The tool locking rod is pushed by a spring and maintains movement toward the lateral opening. When a tool rod enters the lateral opening, the end of the tool locking rod protruding from the lateral opening can abut against the tool rod to ensure that the tool rod is firmly locked.

[0003] To prevent the knife lock rod from accidentally separating from the elongated body when the knife is not engaged, the aforementioned tool change arm is often provided with an elongated groove or an elongated through-hole along the axial direction of the knife lock rod. A locating pin is then secured to the elongated body, with one end of the locating pin protruding into the elongated groove or passing through the elongated through-hole to limit the range of movement of the knife lock rod. Although the locating pin can prevent the knife lock rod from being ejected outward by the spring and accidentally falling, a hole must be drilled in a predetermined portion of the elongated body to accommodate the locating pin. Furthermore, the elongated groove or elongated through-hole also needs to be machined into the knife lock rod, which weakens the structural strength of the elongated body and the knife lock rod itself. Furthermore, with existing tool change arms, dust and foreign matter often become trapped between the wall of the axial hole in the elongated body and the surface of the knife lock rod, causing the knife lock rod to move unsmoothly and, in severe cases, affecting the effectiveness of the knife lock rod in contacting the knife rod. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a tool changing arm of an automatic tool changing mechanism, which can ensure smooth operation of the tool locking rod without reducing the structural strength of the elongated body and the tool locking rod itself.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a tool-changing arm of an automatic tool-changing mechanism, comprising an elongated body and at least one tool-locking unit, wherein the elongated body can rotate around an axis, and a tool-locking arm is formed at each end, the tool-locking arm has a lateral opening, wherein at least one tool-locking arm and the at least one tool-locking unit can jointly lock a tool rod; in addition, the elongated body also has at least one accommodating hole and at least one groove, one end of the at least one groove is connected to the at least one accommodating hole, and the other end is connected to the lateral opening; and the at least one tool-locking unit comprises a brake pin, a positioning seat, a tool-locking rod and a pushing member, wherein the brake pin is arranged in the at least one accommodating hole and can be moved between a first position and a second position in a first direction. The knife locking rod is arranged in the at least one groove and partially passes through the through-hole of the positioning seat, and the knife locking rod can move between a third position and a fourth position in a second direction, wherein it is defined that when the knife locking rod contacts the stop surface of the positioning seat, it is located in the third position; the pushing member is used to push the knife locking rod to maintain movement toward the third position; wherein the first direction and the second direction are non-parallel directions; when the brake pin is located in the first position, the knife locking rod is located in the third position or close to the third position, and when the brake pin is located in the second position, the knife locking rod can move to the fourth position.

[0006] The effect of the present invention is that the cooperation between the groove and the positioning seat stabilizes the translation of the knife locking rod, and the positioning seat also has the effect of limiting the movement range of the knife locking rod, without the need to process more grooves or holes on the elongated body and the knife locking rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A three-dimensional diagram of a tool changing arm of an automatic tool changing mechanism according to a preferred embodiment of the present invention;

[0008] Figure 2 for Figure 1 An exploded view of some components of the tool change arm shown;

[0009] Figure 3 for Figure 2 A partial top view of the elongated body in the tool change arm shown;

[0010] Figure 4 for Figure 2 Exploded view of the tool lock unit in the tool change arm shown;

[0011] Figure 5 for Figure 1 A partial top view of the tool change arm shown;

[0012] Figure 6 for Figure 5 6-6 direction cross-sectional view;

[0013] Figure 7 Similar Figure 5 , revealing the omission of the top cover and the cover in the tool changing arm;

[0014] Figure 8 A partial perspective view of a tool changing arm according to a preferred embodiment of the present invention;

[0015] Figure 9 Similar Figure 6 , revealing the state of the tool changing arm for buckling the tool rod;

[0016] Figure 10 Similar Figure 7 , revealing the state of the tool changing arm for buckling the tool rod;

[0017] Figure 11 Similar Figure 10 , revealing that the tool changing arm is fully engaged with the tool rod.

[0018]

Explanation of symbols

[0019] 100: Tool changing arm

[0020] 10: Long body

[0021] 11: Accommodation hole

[0022] 12: Buckle the knife arm

[0023] 12a: Side opening

[0024] 13: Groove

[0025] 131: First slot section

[0026] 132: Second slot section

[0027] 133: The third slot

[0028] 133a: narrow segment

[0029] 133b: wide section

[0030] 134: Fourth slot section

[0031] 14: Top cover

[0032] 14a: Perforation

[0033] 15: Capping

[0034] 16: injection hole

[0035] 20: Knife locking unit

[0036] 21: Brake pin

[0037] 21a: Trail section

[0038] 21b: Large diameter section

[0039] 21c: Shoulders

[0040] 22: Spring

[0041] 23: Positioning seat

[0042] 23a: Ring Block

[0043] 23b: Stopper

[0044] 23c: Perforation

[0045] 231: front face

[0046] 232: rear end

[0047] 233,234,235,236: Side

[0048] 24: Locking knife bar

[0049] 24a: front end

[0050] 24b: rear end

[0051] 24c: Positioning surface

[0052] 241: First Shaft

[0053] 241a: Cylindrical segment

[0054] 241b: Rectangular segment

[0055] 242: Second shaft

[0056] 25: Dust cover

[0057] 25a: Lip

[0058] 26: Spring

[0059] D1: First direction

[0060] D2: Second direction

[0061] F: lateral force

[0062] L1: axis

[0063] L2: Extension line

[0064] P1: First position

[0065] P2: Second position

[0066] P3: Third position

[0067] P4: Fourth position

[0068] R1: Shoulder

[0069] R2: Resistance

[0070] T: Tool bar

[0071] W1: first slot width

[0072] W2: Second slot width

[0073] W3: Third slot width

[0074] W4: Fourth slot width

[0075] W5: Fifth slot width DETAILED DESCRIPTION

[0076] In order to explain the present invention more clearly, a preferred embodiment is given and described in detail with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, a tool changing arm 100 of an automatic tool changing mechanism of a preferred embodiment of the present invention is connected to one end of a transmission shaft (not shown) of the tool changing mechanism. The tool changing arm 100 is driven by the transmission shaft to rotate and includes an elongated body 10 and at least one tool locking unit 20. The elongated body 10 can rotate around an axis L1, which passes through the center of the transmission shaft. The elongated body 10 is provided with a receiving hole 11 with an unpenetrated bottom on both sides of the axis L1, and a knife-clamping arm 12 is formed at both ends. The knife-clamping arm 12 has a lateral opening 12a. The elongated body 10 also has two grooves 13 formed by depressions from the top surface, and the two grooves 13 are respectively connected to the receiving hole 11 and the lateral opening 12a of the knife-clamping arm 12; in addition, the elongated body 10 is combined with a circular top cover 14 at each corresponding receiving hole 11, and a rectangular cover 15 at each corresponding groove 13. The top cover 14 is used to close the receiving hole 11, and the cover 15 is used to close the groove 13.

[0077] The groove 13 of the elongated body 10 is a U-shaped groove having two groove walls and a groove bottom, and at least one of the two groove walls has a shoulder portion protruding toward opposite directions. Figure 3 As shown, the channel 13 of this embodiment is sequentially defined with a first channel section 131, a second channel section 132, a third channel section 133 and a fourth channel section 134, wherein the first channel section 131 is connected to the lateral opening 12a, and the fourth channel section 134 is connected to the receiving hole 11. Figure 3As shown, the first slot section 131 has a first slot width W1, the second slot section 132 has a second slot width W2, and the third slot section 133 is divided into a narrow section 133a and a wide section 133b according to the slot width. The narrow section 133a has a third slot width W3, and the wide section 133b has a fourth slot width W4, and the third slot width W3 is smaller than the fourth slot width W4. The fourth slot section 134 has a fifth slot width W5. Specifically, the first groove width W1 is smaller than the second groove width W2, so that the two groove walls of the channel 13 form opposing protruding shoulder portions R1 at the junction of the first groove section 131 and the second groove section 132. As previously mentioned, this embodiment has two shoulder portions R1. The narrow section 133a of the third groove section 133 connects to the second groove section 132, and the third groove width W3 is smaller than the second groove width W2. The wide section 133b of the third groove section 133 connects to the fourth groove section 134, and the fourth groove width W4 is greater than the fifth groove width W5. This forms a stop portion R2 at the junction of the wide section 133b of the third groove section 133 and the fourth groove section 134. Furthermore, the elongated body 10 further defines an injection hole 16 at the third groove section 133 of each channel 13, which allows lubricating grease to be injected into the channel 13.

[0078] The at least one knife locking unit 20 is capable of locking a knife rod T ( Figure 9 and Figure 10 In this embodiment, the knife locking unit 20 is provided with two sets and respectively forms a structure capable of locking the knife rod T with the knife locking arms 12 at both ends of the elongated body 10. Since the structures of the two knife locking units 20 are the same, one set of knife locking units 20 and a corresponding knife locking arm 12 will be used as an example for explanation. Figures 4 to 7 As shown, the knife locking unit 20 of this embodiment includes a brake pin 21, a spring 22, a positioning seat 23, a knife locking rod 24, a dust cover 25, and a push member, such as spring 26, but not limited to this. The structural details and related positions of these components are described below.

[0079] The brake pin 21 and the spring 22 are placed together in the accommodating hole 11. The brake pin 21 has a small diameter section 21a, a large diameter section 21b and a shoulder 21c. The small diameter section 21a can pass through a through hole 14a of the top cover 14 and protrude to the outside. The shoulder 21c is located at the connection between the small diameter section 21a and the large diameter section 21b. One end of the spring 22 abuts against the bottom of the accommodating hole 11, and the other end abuts against the large diameter section 21b. The elastic force of the spring 22 keeps the brake pin 21 pushed in a first direction D1. When the shoulder 21c of the brake pin 21 abuts against the bottom surface of the top cover 14, it is fixed and the brake pin 21 is defined as being in a first position P1. At this time, the large diameter section 21b of the brake pin 21 corresponds to the groove 13 ( Figure 6 Reference).

[0080] Please cooperate Figure 4 、 Figure 7 and Figure 8 As shown, the positioning seat 23 is placed in the first groove section 131 of the channel 13. In order to match the channel 13 with a ㄩ-shaped groove, the positioning seat 23 of this embodiment is a rectangular block having a front end face 231, a rear end face 232 and four side faces 233 to 236. The positioning seat 23 is divided into a front section and a rear section. The front section has a ring block 23a formed to protrude outward along the side faces. The ring block 23a constitutes the front abutment defined in the present invention; the rear section has two stoppers 23b. The two stoppers 23b are formed to protrude outward from the side faces of each of the groove walls facing the channel 13. Further, the two stoppers 23b are formed to protrude integrally from the side faces 233 and the side faces 235 respectively and constitute the rear abutment defined in the present invention. In addition, the positioning seat 23 also has a through hole 23c that passes through the front end face 231 and the rear end face 232. The rear end face 232 also constitutes the abutment defined in the present invention. From Figure 7 and Figure 8 As can be seen from the disclosure, after assembly, the ring block 23a of the positioning seat 23 is located outside the channel 13 and abuts the surface of the elongated body 10. The two stoppers 23b protrude into the second channel section 132 and abut against the respective shoulder portions R1. Thus, the positioning seat 23 is firmly seated in the first channel section 131 and prevents arbitrary movement along a second direction D2 orthogonal to the first direction D1. Simultaneously, the through-hole 23c connects the channel 13 with the lateral opening 12a. Furthermore, the positioning seat 23 is restrained by the cover 15 and prevents it from falling out of the channel 13. Specifically, after assembly, the side surface 234 of the positioning seat 23 faces the cover 15, while the side surface 236 faces the bottom of the channel 13.

[0081] The knife locking rod 24 is disposed in the channel 13 so as to be movable in the second direction D2 and partially passes through the through-hole 23c of the positioning seat 23. The knife locking rod 24 is pressed by the cover 15 and does not fall out of the channel 13. The knife locking rod 24 has a front abutting end 24a and a rear abutting end 24b at its two ends. The front abutting end 24a is configured to abut the knife rod T, and the rear abutting end 24b is configured to contact the brake pin 21. In this embodiment, the knife locking rod 24 includes a first rod shaft 241 and a second rod shaft 242 located on the same extension line L2. The second rod shaft 242 is connected to the first rod shaft 241. Preferably, the second rod shaft 242 is connected to the first rod shaft 241 in a manner that can adjust the connection length, that is, the distance from the front end 24a to the rear end 24b can be changed by adjusting the connection length, so that the application of the knife locking rod 24 is more practical. The method for achieving the aforementioned adjustment of the connection length is, for example, but not limited to, providing a screw hole in the first rod shaft 241 and a threaded section in the second rod shaft 242, and achieving the aforementioned purpose by screwing.

[0082] The first shaft 241 of this embodiment has a cylindrical section 241a and a rectangular section 241b. Figure 7 and Figure 8 As shown, the first rod 241 has its cylindrical section 241a passing through the through hole 23c and one end protruding from the side opening 12a constitutes the front end 24a, and the rectangular section 241b is connected to the cylindrical section 241a and forms a positioning surface 24c ( Figure 4 (See FIG1 ); one end of the second rod 242 is connected to the rectangular section 241b, and the other end forms the rear end 24b. The rear end 24b is disposed opposite the large-diameter section 21b of the brake pin 21 at the first position P1. When the knife locking rod 24 is placed in the slot 13, the first rod 241 spans the first slot section 131, the second slot section 132, and a portion of the third slot section 133, while the second rod 242 spans a portion of the third slot section 133 and the fourth slot section 134.

[0083] The dust cover 25 is engaged with the through-hole 23c of the positioning seat 23 and is adjacent to the ring block 23a. The dust cover 25 has a lip 25a. When the cylindrical section 241a of the first shaft 241 of the locking blade 24 passes through the dust cover 25, the lip 25a abuts against the circumference of the cylindrical section 241a. In one embodiment, the dust cover 25 is made of rubber and has the ability to deform to ensure smooth movement of the locking blade 24 and prevent foreign matter from entering the channel 13 through the through-hole 23c of the positioning seat 23.

[0084] The spring 26 is sleeved on the second rod body 242 and is located in the third groove section 133. One end of the spring 26 acts on the resisting portion R2 of the elongated body 10, and the other end acts on the first rod body 241 of the locking knife rod 24. The elastic force of the spring 26 pushes the locking knife rod 24 to maintain movement toward the lateral opening 12a. When the positioning surface 24c of the locking knife rod 24 contacts the rear end surface 232 of the positioning seat 23, the locking knife rod 24 in this state is defined to be located at a third position P3. In other words, the spring 26 pushes the locking knife rod 24 to maintain movement toward the third position P3.

[0085] The above is a description of the structures of the two ends of the tool changing arm 100 of the preferred embodiment of the present invention when the tool rod T is not engaged. At this time, the brake pin 21 is located in the first position P1, and the knife locking rod 24 is pushed by the spring 26 so that its positioning surface 24c contacts the rear end surface 232 of the positioning seat 23 and stops at the third position P3. At the same time, there is a slight gap between the rear end 24b of the knife locking rod 24 and the circumference of the large diameter section 21b of the brake pin 21, which is about 1 mm in practice. The purpose of the aforementioned reserved gap is to facilitate the smooth execution of the action of engaging the tool rod T.

[0086] Please cooperate again Figure 9 and Figure 10 As shown, it shows that the tool changing arm 100 performs the tool changing action as the transmission shaft of the tool changing mechanism rotates. At this time, the brake pin 21 of the tool locking unit 20 will be subjected to the lateral force F, and then retreat to a second position P2 inside the accommodating hole 11 and press down the spring 22. The brake pin 21 at the second position P2 is changed to have its small diameter section 21a correspond to the groove 13, resulting in an increase in the distance from the small diameter section 21a to the port of the groove 13 connecting to the accommodating hole 11. The space vacated in this state facilitates the translation of the tool locking rod 24 in the second direction D2. When the elongated body 10 is in the process of engaging the knife rod T with its knife-engaging arm 12, the knife rod T pushes the front end 24a of the knife-locking rod 24 and moves the knife-locking rod 24 toward the brake pin 21, while compressing the spring 26. It is defined here that when the knife rod T can smoothly pass through the front end 24a, the position of the knife-locking rod 24 is a fourth position P4 ( Figure 10 Reference).

[0087] When the knife bar T enters the side opening 12a and rests against the inner edge of the knife arm 12, the spring 26 releases the compressed energy and continues to push the brake pin 21 toward the Figure 11 The third position P3 shown in FIG. 2 is moved to the front end 24a and buckles the knife bar T to prevent the knife bar T from loosening. At this time, the spring 22 pushes the brake pin 21 from the second position P2 to return to the position shown in FIG. Figure 6In the first position P1 shown, the large diameter section 21b of the brake pin 21 will again abut against the rear abutment end 24b of the knife locking rod 24, ensuring that the knife locking rod 24 does not move arbitrarily and that the knife rod T is securely engaged. It should be noted that in the aforementioned engaged state of the knife rod T, the brake pin 21 has returned to the first position P1, and the knife rod T pushes against the knife locking rod 24, causing the rear abutment end 24b of the knife locking rod 24 to abut against the large diameter section 21b, indirectly creating a gap (approximately 1 mm) between the positioning surface 24c of the knife locking rod 24 and the rear end surface 232 of the positioning seat 23, also for the purpose of facilitating the smooth engagement of the knife rod T. The knife locking rod 24 in this state is defined as being located near the third position P3.

[0088] As can be seen from the above description, the tool change arm 100 of this embodiment restricts the movement of the knife lock rod 24 toward the lateral opening 12a through the rear end surface 232 of the positioning seat 23, thereby preventing the knife lock rod 24 from being improperly dislodged. In other words, the tool change arm 100 of this embodiment does not require a positioning pin, drilling holes in the elongated body, or processing elongated grooves or elongated through-holes in the knife lock rod, thereby maintaining structural strength. Secondly, the provision of the dust cover 25 can effectively prevent dust and foreign matter from entering the groove 13 through the through-hole 23c of the positioning seat 23, thereby ensuring the smooth operation of the knife lock rod 24.

[0089] It is also worth mentioning that the above-mentioned positioning seat 23 is designed with its stop block 23b to abut the shoulder portion R1 of the elongated body 10, so that the grease injected into the groove 13 from the injection hole 16 will be blocked by the rear end surface 232 of the positioning seat 23 and will not penetrate to the outside, thereby ensuring a good lubrication effect for the movement of the locking knife rod 24, eliminating the need to frequently inspect whether the grease is reduced, and reducing the number of times the grease needs to be replenished.

[0090] The above description is only a preferred embodiment of the present invention. Any equivalent changes made by applying the description and claims of the present invention should be included in the patent scope of the present invention.

Claims

1. A tool changing arm for an automatic tool changing mechanism, comprising an elongated body and at least one tool locking unit. The elongated body is rotatable about an axis and has a tool-locking arm formed at each end. The tool-locking arm has a lateral opening, wherein the at least one tool-locking arm and the at least one tool-locking unit can jointly lock onto a tool rod. The following are characteristics: The elongated body has at least one receiving hole and at least one channel, one end of the at least one channel is connected to the at least one receiving hole, and the other end is connected to the side opening; The at least one knife locking unit includes a brake pin, a positioning seat, a knife locking rod and a pushing member, wherein the brake pin is arranged in the at least one accommodating hole and can move between a first position and a second position in a first direction; the positioning seat is located in the at least one groove and has a stop surface and a through hole, which connects the at least one groove and the lateral opening; the knife locking rod is arranged in the at least one groove and partially passes through the through hole of the positioning seat, and the knife locking rod can move between a third position and a fourth position in a second direction, wherein it is defined that when the knife locking rod contacts the stop surface of the positioning seat, it is in the third position; the pushing member is used to push the knife locking rod to maintain movement toward the third position; wherein the first direction and the second direction are non-parallel directions; when the brake pin is in the first position, the knife locking rod is in the third position or close to the third position, and when the brake pin is in the second position, the knife locking rod can move to the fourth position.

2. The tool changing arm of the automatic tool changing mechanism according to claim 1, characterized in that: The at least one groove of the elongated body has two groove walls and a groove bottom, and at least one of the two groove walls has a shoulder portion protruding toward opposite directions; the positioning seat has a front abutment portion and a rear abutment portion arranged opposite to each other, the front abutment portion is located outside the at least one groove and abuts the surface of the elongated body, and the rear abutment portion abuts the shoulder portion; at least one cover is combined with the elongated body and confines the positioning seat and the knife locking rod in the at least one groove.

3. The tool changing arm of the automatic tool changing mechanism according to claim 2, characterized in that: The positioning seat is a rectangular block having a front end face, a rear end face and four side faces, the through hole passes through the front end face and the rear end face and the rear end face constitutes the stop face, the two opposite side faces of the positioning seat respectively face the two groove walls of the at least one groove, and the other two opposite side faces respectively face the groove bottom of the at least one groove and the at least one cover; a front section of the positioning seat has a ring block constituting the front abutment, and the ring block is formed by protruding outward along the side faces, and a rear section of the positioning seat has at least one stop block constituting the rear abutment, and the at least one stop block is formed by protruding outward from at least one side facing the two groove walls.

4. The tool changing arm of the automatic tool changing mechanism according to claim 1, characterized in that: The knife locking rod has a first rod shaft and a second rod shaft located on the same extension line, the first rod shaft is penetrated by the through hole and one end protrudes from the lateral opening, the second rod shaft is connected to the first rod shaft in a manner capable of adjusting the coupling length, wherein the first rod shaft has a positioning surface, which can contact the blocking surface to place the knife locking rod in the third position.

5. The tool changing arm of the automatic tool changing mechanism according to claim 4, characterized in that: The first rod body has a cylindrical section and a rectangular section, the cylindrical section passes through the through hole and one end protruding to the lateral opening constitutes a front abutment end, the rectangular section is connected to the cylindrical section and constitutes the positioning surface at the connection portion; the second rod body has a rear abutment end, wherein when the knife rod is buckled and the front abutment end abuts the knife rod, the rear abutment end contacts the brake pin.

6. The tool changing arm of the automatic tool changing mechanism according to claim 4, characterized in that: The at least one groove of the elongated body is defined in sequence as a first groove section, a second groove section, a third groove section and a fourth groove section, the first groove section is connected to the lateral opening, and the fourth groove section is connected to the at least one accommodating hole; the positioning seat is located in the first groove section, the first rod body of the knife locking rod is located in the first groove section, the second groove section and a part of the third groove section, the second rod body is located in a part of the third groove section and the fourth groove section, the pushing member includes a spring and is sleeved on the second rod body and is located in the third groove section, one end of the spring acts on the elongated body, and the other end acts on the knife locking rod.

7. The tool changing arm of the automatic tool changing mechanism according to claim 6, characterized in that: The elongated body has an injection hole connected to the third groove section, and the injection hole is used for injecting lubricating grease into the at least one groove.

8. The tool-changing arm of the automatic tool-changing mechanism according to claim 7, wherein the slot width of the first slot segment is smaller than the slot width of the second slot segment, so that the first slot segment and the second slot segment form at least one shoulder portion at the connection portion; the slot width of the third slot segment is larger than the slot width of the fourth slot segment, so that the third slot segment and the fourth slot segment form at least one stop portion at the connection portion; wherein, The positioning seat has a front abutment and a rear abutment arranged opposite to each other, the front abutment protrudes out of the first slot section and abuts the surface of the elongated body, and the rear abutment protrudes into the second slot section and abuts the shoulder; one end of the spring acts on the abutment, and the other end acts on the first rod body.

9. The tool changing arm of the automatic tool changing mechanism according to claim 1, characterized in that: The at least one knife locking unit includes a dustproof sleeve, the dustproof sleeve is combined with the through hole of the positioning seat, and the knife locking rod passes through the dustproof sleeve.

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