TW202126425A - Non-impact tool changing apparatus including a tool changing arm, a driving unit and a tool locking unit - Google Patents

Abstract

Provided is a non-impact tool changing apparatus including a tool changing arm, a driving unit and a tool locking unit. The tool changing arm includes a body and a tool fastening block; the driving unit includes a driving seat mounted on the body, a driving slope disposed on the driving seat and provided with a tool loosening part and a tool locking part, a fixed seat fixedly disposed on the body and a first elastic element enabling the driving seat to constantly move in a direction away from the fixed seat; the tool locking unit includes a tool locking rod mounted on the body and a second elastic element enabling the tool locking rod to constantly move towards the driving seat; and the tool locking rod is provided with a driven slope and an abutment surface. When the tool loosening part pushes against the driven slope, the abutment surface is located outside a path where a tool holder enters the tool fastening block; and when the tool locking part pushes against the driven slope, the abutment surface abuts against the tool holder. Therefore, the non-impact tool changing apparatus has the characteristic that the tool holder does not impact against the tool locking rod in a tool changing process.

Description

Impact-free tool changer

The invention relates to a tool equipment of a machine tool, in particular to a non-impact tool changer.

1, a tool change device 10 of a conventional machine tool includes a tool change arm 11, and two tool blocks 12 extending in opposite directions from both sides of the tool change arm 11 are movably mounted on the tool change arm The two locking knife bars 13 of 11 are respectively sleeved outside the two locking knife bars 13 so that the two locking knife bars 13 constantly move in the direction of the two locking knife blocks 12 and two springs 14 are respectively mounted on the tool changer arm 11 Two positioning rods 15 for the inner ends of the two locking knife rods 13 to abut against. Each buckle block 12 has a buckle groove 121, and the front end of each lock lever 13 is provided with an abutment block 131. Normally, the buckle block 131 extends into the respective buckle groove 121, that is, is located in a blade The rod 20 enters the path of the knife groove 121.

When in use, the tool change arm 11 is first rotated. During the rotation of the tool change arm 11, because the stop block 131 is located on the path where the tool bar 20 enters the knife groove 121, the tool bar 20 will first Hit the stop block 131 to move the knife lock lever 13 toward the positioning rod 15 to enter the knife lock groove 121 to complete knife lock. The abutment block 131 abuts the knife bar 20 to complete the knife lock, and finally, the knife change arm 11 is rotated to the set position and the knife change operation is completed.

Although the tool changer 10 has the above-mentioned functions, it has the following problems: the rotation speed of the tool change arm 11 is very fast, and every time the tool change operation is performed, the tool lever 20 must hit the stop block 131 to enter the When the tool is buckled in the buckle groove 121, it will not only cause loud noises and cause noise pollution, but also affect the accuracy and life of the machine tool spindle. In addition, the stop block 131 is often damaged by impacts and lowers the tool holder. The resisting effect of 20 can easily occur when the tool bar 20 flies and falls during the tool change process, causing casualties on site and damaging other equipment.

Therefore, the purpose of the present invention is to provide an impact-free tool changer that can solve the prior art problems.

Therefore, the impact-free tool changing device of the present invention is suitable for being installed on a machine tool and performing tool clamping, locking and loosening of a tool bar. The impact-free tool changing device includes a tool changing arm, a drive unit and a locking tool. unit. The tool changer arm includes a body placed along a first direction, and a body extending from one side of the body along the first direction and having a buckle groove open toward a second direction perpendicular to the first direction The buckle block has a first accommodating groove arranged on the main body along the first direction, and a third accommodating groove arranged on the main body along a third direction perpendicular to the first direction and the second direction. The drive unit includes a drive seat installed in the perforation and movable along the third direction, a fixed seat fixed on the body, and a fixed seat installed between the drive seat and the fixed seat The first elastic member that makes the driving seat constantly move in a direction away from the fixed seat, the driving seat has a driving inclined surface arranged along the third direction, and the driving inclined surface has a knife releasing part away from the fixing seat and a Close to the lock knife portion of the fixed seat; the lock knife unit includes a lock knife rod installed in the first accommodating groove and movable along the first direction, and a knife lock rod installed between the lock knife rod and the body A positioning block, and a second elastic member installed between the knife lock bar and the positioning block to make the knife lock bar move towards the drive seat constantly, the knife lock bar can be between a knife lock position and a knife release position It has an abutting portion close to the buckle block, a driven portion close to the drive seat, and a driven portion arranged on the driven portion in surface contact with the driven inclined surface and pushed against by the driven inclined surface. Drive inclined surface, and an abutting surface arranged on the abutting portion; when the driving seat is pressed and moved in the direction of the third direction toward the fixed seat, the loosening portion of the driving inclined surface pushes against the knife lock lever Driven surface, the knife lock bar is located at the knife release position, and the abutment surface is located outside the path of the knife bar entering the knife slot, so that the knife bar does not hit the knife bar and enters the knife slot to complete the knife lock , When the drive seat is not pressed, the lock knife portion of the drive inclined surface pushes against the driven surface of the lock knife bar, the lock knife bar is located at the lock knife position, and the abutment surface abuts the knife bar and interacts with the knife bar. The knife holder cooperates with clamping the knife bar to complete the knife lock. When the driving base is pressed to make the knife lock bar located at the knife release position, the abutment surface releases the abutment against the knife bar to complete the knife release.

The effect of the present invention is that when the knife is buckled, the abutment surface of the knife lock bar is located outside the path of the knife bar entering the knife slot, so that the knife bar does not hit the knife lock bar and enters the knife slot, by Therefore, the invention does not generate impact noise, and can reduce the damage rate of components and machine tools.

The following describes the present invention in detail with reference to the accompanying drawings and embodiments. Before the present invention is described in detail, attention should be paid to the relative position terms used in the following description, such as "first direction X" and "second direction Y" "The third direction Z" is based on the directions shown in each figure and the normal use direction, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other. Specifically, in an embodiment of the impact-free tool changer 3 of the present invention, the first direction X, the second direction Y, and the third direction Z refer to the left-right direction, the front-rear direction, and the top-bottom direction. This should limit the use of the present invention.

6, the impact-free tool changer 3 is suitable for installation on a machine tool 60, the machine tool 60 has a control shaft 61 and a tool release block 62, and the control shaft 61 can extend along the third direction Z Since the movement of the control shaft 61 is easily understood by those with ordinary knowledge in the technical field to which the present invention belongs, and is not a feature of the present invention, the detailed structure and rotation of the control shaft 61 will not be repeated here. Principle of action.

This embodiment of the collision-free tool changing device 3 includes a tool changing arm 30 assembled on the control shaft 61, two driving units 40 and two locking tool units 50.

2-6, the tool change arm 30 includes a body 31, two buckle blocks 32, two first accommodating grooves 33, two positioning grooves 34, two through holes 35, two communicating holes 36 and a central shaft hole 37 .

The main body 31 is a long rod placed along the first direction X.

The two buckle blocks 32 extend from both sides of the main body 31 along the first direction X toward opposite directions, and each has a buckle groove 321 that opens toward the second direction Y, and the two buckle grooves 321 are open In the opposite direction, each buckle groove 321 is approximately semicircular.

The two first accommodating grooves 33 are disposed on the main body 31 along the first direction X and open toward the third direction Z.

The two positioning grooves 34 are disposed on the main body 31 along the second direction Y and communicate with the two first accommodating grooves 33 respectively.

The two through holes 35 penetrate the main body 31 along the third direction Z and communicate with the two first accommodating grooves 33 respectively.

The two communicating holes 36 are disposed on the main body 31 along the second direction Y and communicate with the two through holes 35 respectively.

The central shaft hole 37 is arranged on the main body 31 along the third direction Z and is located between the two through holes 35. The central shaft hole 37 is for the control shaft 61 to be inserted and connected, so that the tool changer arm 30 can be controlled by the control shaft. Driven by 61, it can linearly move along the third direction Z to approach or move away from the tool loosening block 62, and can rotate with the control shaft 61 as a rotation axis.

Each driving unit 40 includes a driving seat 41, a driving inclined surface 42, a fixing seat 43, a first elastic member 44, a buffer block 45 and a limiting group 46.

The driving seat 41 is inserted in the respective perforations 35 and can move linearly along the third direction Z, and the driving seat 41 has an outer peripheral surface 411, and is arranged along the third direction Z and opens toward the opposite direction. A first groove 412 and a second groove 413, the first groove 412 is close to the knife loosening block 62, and the second groove 413 is away from the knife loosening block 62.

The driving slope 42 is disposed at the middle portion of the outer peripheral surface 411 of the driving seat 41 and slopes in from the second groove 413 toward the first groove 412. There is a gap between the driving slope 42 and the outer circumferential surface 411. The included angle θ is 8° to 20°, and has the characteristics of a self-locking surface. The driving inclined surface 42 has a knife releasing portion 421 far away from the fixing base 43 and a knife locking portion 422 close to the fixing base 43. Specifically, the distance between the knife releasing portion 421 and the outer peripheral surface 411 along the first direction X is relatively large, and the distance between the knife locking portion 422 and the outer peripheral surface 411 along the first direction X is relatively small.

The fixing seat 43 is fixed on the body 31 corresponding to the driving seat 41. Preferably, the fixing seat 43 is a sleeve sleeved on the driving seat 41 and fixed on the body 31, so that the More than half of the driving seat 41 is restricted, so that the movement stability of the driving seat 41 can be improved.

The first elastic member 44 is installed between the driving base 41 and the fixing base 43 along the third direction Z, and can apply an elastic thrust to the driving base 41 to make the driving base 41 always face away from the fixing base 43 And the first elastic member 44 is restricted between the second groove 413 of the driving seat 41 and the fixing seat 43, so that the accuracy of the movement and deformation of the first elastic member 44 can be improved. In this embodiment, the The first elastic member 44 is a compression spring, but may also be other elastic elements.

The buffer block 45 is installed in the first groove 412 and protrudes from the driving seat 41 and faces the loosening block 62. In this embodiment, the buffer block 45 is made of engineering plastic, which can prevent the driving seat 41 from being loosened. The knife block 62 directly touches and strikes.

The limiting group 46 is disposed between the main body 31 and the driving seat 41, and has a first limiting slot 461 of the driving seat 41 corresponding to each of the communicating holes 36 provided along the third direction Z. And a limiting member 462 fixed in the communicating hole 36 and extending into the first limiting groove 461. The cooperation of the first limiting groove 461 and the limiting member 462 can limit the driving seat For the movement stroke and movement path of 41, the limiting member 462 can be a bolt screwed and fixed to the communicating hole 36, or a bolt inserted and fixed to the communicating hole 36.

Each knife locking unit 50 includes a knife locking rod 51, a positioning block 52, a second elastic member 53 and a cover 54.

The knife lock lever 51 is installed in each of the first accommodating grooves 33 and can move between a knife release position (see Figure 8, Figure 9) and a knife lock position (see Figure 11, Figure 12), It also has an abutting portion 511 close to the knife block 32, a driven portion 512 close to the driving seat 41, and a free end of the driven portion 512 disposed on a free end of the driven portion 512 and in surface contact with the driving inclined surface 42 The driven inclined surface 513 is a second accommodating groove 514 disposed on the abutting portion 511 along the first direction X and opening toward the third direction Z, and a second accommodating groove 514 is disposed on the abutting portion 511 along the second direction Y And open toward the third direction Z and communicate with the second limiting groove 515 of the second accommodating groove 514, an abutting surface 516 provided at a free end of the abutting portion 511, and an abutting surface 516 from the abutting surface 516 An avoiding slope 517 that slopes in toward the driven part 512.

The positioning block 52 is installed and fixed in the positioning slot 34 and located in the second limiting slot 515.

The second elastic member 53 is installed in the second accommodating groove 514 and extends along the first direction X, and is limited between the knife lock lever 51 and the positioning block 52, and can be applied to the knife lock lever 51 The elastic thrust causes the knife lock 51 to constantly move toward the driving seat 41. In this embodiment, the second elastic member 53 is a compression spring, but it can also be other elastic elements.

The cover plate 54 is fixed to the main body 31, so that the positioning block 52 and the second elastic member 53 are restricted, and at the same time, the lock knife rod 51, the positioning block 52 and the second elastic member 53 are concealed Inside the tool changer arm 30.

Because the actions of the two sets of drive units 40 and the knife lock unit 50 of the present invention are the same, only one set of drive units 40 and the knife lock unit 50 are used for description below.

4, in the normal state, the driving seat 41 of the driving unit 40 moves away from the fixed seat 43 by the elastic thrust of the first elastic member 44. At this time, the locking knife portion 422 of the driving inclined surface 42 pushes Abutting the driven inclined surface 513 of the knife lock lever 51 makes the knife lock lever 51 close to the knife lock block 32 and located at the knife lock position, and at the same time the second elastic member 53 is in a compressed state.

6-9, after the collision-free tool changer 3 is assembled and connected to the control rod 61, first, the control rod 61 is ordered to retract to drive the non-collision tool changer 3 close to the tool release block 62, and The buffer block 45 of the drive unit 40 is pressed by the knife release block 62, so that the drive seat 41 moves toward the fixing seat 43, and at the same time, the knife lock portion 422 of the drive inclined surface 42 gradually leaves the knife lock bar 51 is driven inclined surface 513, the knife releasing portion 421 gradually approaches the driven inclined surface 513, and the knife lock lever 51 is elastically pushed by the second elastic member 53 to move toward the direction of the driving seat 41, when the driving seat 41 When the knife release portion 421 is moved to push against the driven inclined surface 513, the knife lock lever 51 moves away from the knife block 32 and reaches the knife release position. At this time, the abutting surface 516 and the avoiding inclined surface 517 are located in a knife bar. Outside of the path where 70 enters the buckle groove 321, the first elastic member 44 is in a compressed state. Then, the control rod 61 is ordered to drive the tool changer arm 30 to rotate, so that the knife block 32 rotates close to the knife bar 70. When the knife bar 70 enters the knife slot 321, because the lock knife bar 51 is located The knife release position, the abutment surface 516 and the evasion slope 517 are located outside the path of the knife bar 70 entering the knife slot 321, so the knife bar 70 will not hit the lock knife bar 51, but can enter without impact In the buckle groove 321, when the knife lever 70 is buckled by the knife block 32, the control shaft 61 stops rotating.

It is easy to understand that with the avoiding inclined surface 517, the moving distance of the knife lock lever 51 between the knife lock position and the knife release position can be reduced, thereby shortening the working time and improving the working efficiency.

10 to 12, when the tool bar 70 enters the buckle groove 321 and is buckled by the buckle block 32 to complete the buckle operation, the control shaft 61 is ordered to extend and drive the non-impact tool changer 3 to move away from The knife release block 62 moves in the direction, and at the same time the knife release block 62 releases the pressure on the buffer block 45. At this time, the driving seat 41 is elastically pushed away from the fixing by the return elastic force of the first elastic member 44 The direction of the seat 43 moves, so that the knife releasing portion 421 of the driving inclined surface 42 gradually leaves the driven inclined surface 513 of the knife locking lever 51, and the knife locking portion 422 gradually approaches the driven inclined surface 513 and pushes the knife locking lever 51 toward Move close to the direction of the knife holder 32 and the knife bar 70, when the drive base 41 moves to the position where the knife lock portion 422 pushes against the driven inclined surface 513, it stops moving. At this time, the knife lock bar 51 reaches the In the knife lock position, the abutting surface 516 abuts the knife rod 70 and cooperates with the knife block 32 to complete the knife lock operation, and at the same time the second elastic member 53 is in a compressed state.

When the knife lock lever 51 is located at the knife lock position, the clamping angle between the abutment surface 516 and the knife block 32 on the knife lever 70 is greater than 180°, which can prevent the knife lever 70 from rotating at a high speed during subsequent operations. Flew and fell during the process.

After the knife lock operation is completed, the control lever 61 is ordered to drive the non-impact tool changer 3 to rotate, so that the tool lever 70 is moved to a predetermined position, see Figures 7, 8, and 9, and then the control lever 61 is ordered to retract The tool bar 70 is moved along the third direction Z to be inserted into a spindle or a tool magazine (not shown) of the machine tool 60, and at the same time the drive seat 41 moves toward the tool release block 62 so that the buffer block 45 is released. The knife block 62 is pressed and then transformed into the knife loosening portion 422 of the driving inclined surface 42 to push against the driven inclined surface 513, and the knife lock lever 51 is elastically pushed by the second elastic member 53 to move toward the driving seat 41 to the knife loosening portion 41 Position, at this time, the abutment surface 516 releases the abutment of the tool bar 70 to complete the tool release operation, and finally, the control shaft 61 is ordered to rotate in the opposite direction to the aforementioned rotation, so that the impact-free tool changer can be made 3 Disengage the tool bar 70 and complete the tool change operation.

In summary, the impact-free tool changer 3 of the present invention has the following functions and advantages, so it can indeed achieve the purpose of the present invention.

1. When the present invention performs the tool buckle operation, the tool bar 70 will not hit the lock tool bar 51 at all, so that the present invention will not generate impact noise, can prevent damage to other components and increase the spindle of the machine tool 60 , The service life of the non-collision tool changer 3, and can prevent the tool bar 70 from flying away during the rotation process, and can avoid the casualties of on-site personnel.

2. According to the present invention, by the surface contact between the driving inclined surface 42 and the driven inclined surface 513, the stabilizing effect of the driving seat 41 driving the lock knife lever 51 can be improved, and the contact surface 516 can be improved to the knife lever. The 70 counteracting effect can further improve the quality of tool change operations.

3. In the present invention, the angle θ between the driving slope 42 and the outer peripheral surface 411 is 8° to 20°, so that the driving slope 42 has the characteristics of a self-locking surface, which can improve the driving slope 42 and the driven surface. The stabilizing effect of the contact between the inclined surfaces 513, and the driving inclined surface 42 can easily push the driven inclined surface 513, thereby improving the quality of the tool change operation.

Fourth, the present invention can reduce the moving distance of the knife lock lever 51 between the knife lock position and the knife release position by the evasion slope 517, which can shorten the operation time and improve the operation efficiency.

5. The buffer block 45 of the present invention can produce a buffer effect and can avoid direct contact and impact between the tool loosening block 62 and the driving seat 41, thereby reducing the damage rate of the impact-free tool changer 3.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

3: No impact tool changer 30: Tool change arm 31: body 32: Knife block 321: Knife Groove 33: The first holding tank 34: positioning slot 35: Piercing 36: Connecting hole 37: Center shaft hole 40: drive unit 41: Drive seat 411: Outer peripheral surface 412: first groove 413: second groove 42: drive slope 421: Loose Knife Department 422: Lock Knife Department 43: fixed seat 44: The first elastic part 45: buffer block 46: Limit group 461: limit slot 462: limit piece 50: Lock knife unit 51: Locking knife arm 511: Arrest Department 512: Driven part 513: Driven Slope 514: second holding tank 515: second limit slot 516: contact surface 517: Dodge Slope 52: positioning block 53: second elastic part 54: cover 60: machine tool 61: Control axis 62: Loose Knife Block 70: Toolholder X: first direction Y: second direction Z: Third party

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a top view of a conventional tool changer; Figure 2 is a top view of an embodiment of the impact-free tool changer of the present invention; Figure 3 is an incomplete partially exploded perspective view of the embodiment; Figure 4 is an incomplete combined cross-sectional view of the embodiment; Figure 5 is a cross-sectional view of a driving seat of the embodiment; Figure 6 is a schematic diagram of this embodiment installed on a machine tool, showing that the two-locking tool bar is in the tool-releasing position; Figure 7 is a view similar to Figure 6, showing the completion of the knife-cutting operation; Fig. 8 is a partial enlarged view taken from Fig. 7, showing a knife lock bar in a knife release position; Figure 9 is a top view of the embodiment, showing the completion of the knife clinching operation; Fig. 10 is a view similar to Fig. 7, showing that the two-locking knife bar is located at the knife-locking position and completing the knife-locking operation; Figure 11 is a partial enlarged view taken from Figure 10, showing that the knife lock lever is in the knife lock position; and Figure 12 is a view similar to Figure 9 showing the completion of the knife lock operation.

30: Tool change arm

31: body

32: Knife block

33: The first holding tank

35: Piercing

40: drive unit

41: Drive seat

412: first groove

413: second groove

42: drive slope

421: Loose Knife Department

422: Lock Knife Department

43: fixed seat

44: The first elastic part

45: buffer block

46: Limit group

461: limit slot

462: limit piece

50: Lock knife unit

51: Locking knife arm

511: Arrest Department

512: Driven part

513: Driven Slope

514: second holding tank

515: second limit slot

516: contact surface

517: Dodge Slope

52: positioning block

53: second elastic part

54: cover

X: first direction

Y: second direction

Z: Third party

Claims (10)

A non-collision tool changer, which is suitable for being installed on a machine tool to buckle, lock and release a tool on a tool bar. The non-collision tool changer includes: A tool changer arm includes a body placed along a first direction, and a knife groove extending from one side of the body along the first direction and opening toward a second direction perpendicular to the first direction The buckle block, a first accommodating groove provided in the main body along the first direction, and a third direction perpendicular to the first direction and the second direction are provided in the main body and connected to the first Perforations connected by the containing groove; A driving unit includes a driving seat installed in the perforation and movable along the third direction, a fixing seat fixed on the main body, and a driving seat installed between the driving seat and the fixing seat so that the driving seat A first elastic member that moves in a direction away from the fixed seat with a constant direction. The drive seat has a drive inclined surface arranged along the third direction. Lock knife department; and A knife lock unit includes a knife lock rod installed in the first accommodating groove and movable along the first direction, a positioning block mounted between the knife lock rod and the body, and a positioning block mounted on the The second elastic member between the knife lock bar and the positioning block that makes the knife lock bar constantly move toward the drive seat, the knife lock bar can move between a knife lock position and a knife release position, and has a knife close to the The abutting part of the buckle block, a driven part close to the driving seat, a driven slope arranged on the driven part in surface contact with the driven slope and being pushed against by the driving slope, and a driven slope arranged on the The opposing surface of the opposing part; When the driving seat is pressed and moved in the third direction toward the fixed seat, the knife releasing portion of the driving inclined surface pushes against the driven surface of the knife lock lever, the knife lock lever is located at the knife loose position, and the knife abutment The setting surface is located outside the path through which the knife bar enters the knife slot, so that the knife bar does not hit the lock knife bar and enters the knife slot to complete the knife lock. When the drive seat is not pressed, the lock knife of the drive slope The part pushes against the driven surface of the lock knife bar, the lock knife bar is located at the lock knife position, the abutment surface abuts the knife bar and cooperates with the knife holder to clamp the knife bar to complete the lock knife. The seat is pressed so that the knife lock bar is located at the knife release position, and the abutment surface releases the abutment of the knife bar to complete the knife release. The impact-free tool changer according to claim 1, wherein the driving seat has an outer peripheral surface, and an included angle is formed between the outer peripheral surface and the driving inclined surface, and the included angle is 8° to 20°. The non-impact tool changer according to claim 2, wherein when the tool lock bar is located at the tool lock position, the clamping angle between the abutment surface and the knife block against the tool bar is greater than 180°. The impact-free tool changer according to claim 2, wherein the driving unit further includes a buffer block installed on the driving seat and protruding from the driving seat. The impact-free tool changer according to claim 4, wherein the buffer block is made of engineering plastic. The non-impact tool changer according to claim 4, wherein the fixing seat is a sleeve sleeved outside the driving seat and fixed on the body, and the driving seat also has a first set along the third direction. A groove and a second groove, the buffer block is installed in the first groove, and the first elastic member is restricted between the second groove and the fixing seat. The non-collision tool changer according to claim 2, wherein the tool lock lever further has an evasive inclined surface inclined from the abutting surface toward the driven part. The impact-free tool changer according to claim 2, wherein the drive unit further includes a limit set, the limit set has a first limit slot provided on the drive seat along the third direction, and a A limiting member fixed on the main body and extending into the first limiting groove is inserted through. The impact-free tool changing device according to claim 2, wherein the body further has a positioning groove arranged along the second direction and communicating with the first accommodating groove, and the lock tool lever further has a positioning groove along the first direction. A second accommodating groove provided in the abutting portion, and a second limiting groove provided in the abutting portion along the second direction and communicating with the second accommodating groove, and the positioning block is installed and fixed to the positioning groove And is located in the second limiting groove, and the second elastic member is installed in the second accommodating groove and is limited between the knife lock lever and the positioning block. The impact-free tool changing device according to claim 9, wherein the first accommodating groove, the positioning groove, the second accommodating groove, and the second limiting groove are all open toward the third direction, and the locking knife The unit also includes a cover plate, which is fixed to the body so that the knife lock lever, the positioning block and the second elastic member are hidden in the tool change arm.

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