TWM539417U - Tool changing device with tool locking advancer - Google Patents

Description

Tool changer capable of locking the knife in advance

This creation is related to the machine tool for machining, especially a tool change device that specially sets the lock knife control unit to control the lock knife to be actuated in advance.

With the increasing processing requirements and processing technology, the existing machine tools usually set up a tool magazine to store various specifications of the tool. The tools stored in the tool magazine can be moved cyclically, and through the tool change mechanism and the machining spindle according to the processing requirements. The tool is used interchangeably.

An improved tool changer arm structure disclosed in the TW certificate number M413563 patent, which comprises an organic seat, a tool change arm, a pusher and a top member; wherein the tool change arm is assembled on the machine base and is at the end The part is provided with a buckle edge; the pushing member is installed inside the tool change arm, and the pushing member is pushed by the compression spring, so that the front end of the pushing member can protrude toward the buckle edge; the top piece is mounted on the tool changer The inside of the arm is pushed against by another compression spring, so that the top jaw abuts against the rear end of the pushing member, and a portion of the top member protrudes from the tool change arm.

In this type of tool change arm structure, the tool change arm must be moved toward the base, and a part of the change arm protrudes against the base with the top piece, so that the top piece can be pressed against the compression spring and away from the pusher. And the space for the push back is vacated, and at this time, the rear end of the pusher can be retracted, so the structure of the change arm is in an unlocked state.

When the knife edge is fastened to the fixed tool, the tool change arm must leave the base, and the top jaw is reset by the compression spring, and is re-supported to the rear end of the top abutment. The end is abutted by the top jaw and cannot be retracted, so that the tool change arm structure is in the state of the lock knife, so that the top abutment can jointly limit the cutter with the buckle edge.

However, at the moment when the tool change arm leaves the machine base, the tool may still be displaced due to the sway, so that the tool falls off the buckle edge during the process of the tool change arm leaving the machine base; therefore, how to improve the lock knife The mechanism makes the structure of the tool change arm ahead of the lock knife before the tool change arm leaves the machine base, which is one of the directions that the relevant practitioners are striving to develop.

In order to solve the problem that the existing tool change arm structure is not in the lock knife state before the tool change arm leaves the machine base, and the tool change arm is separated from the machine base, the tool center of gravity is offset and falls off the buckle edge and is dropped. A tool change device capable of locking a knife in advance, which is provided with a lock knife control component specially used for driving and controlling the lock knife, so that the tool change arm device is in a lock knife state before the tool change arm leaves the machine seat, Improve stability when replacing tools.

The present invention solves the technical problem and provides a knife changing device capable of locking the knife in advance, comprising: a body comprising a rotatable sliding sleeve assembly; a tool changing arm assembly assembled to the sliding sleeve assembly and including a change a cutter arm body, the tool change arm body includes opposite two mounting ends, and an intermediate section of the tool changer body is coupled to the sliding sleeve assembly; and two jaw assemblies, the two jaw assemblies are respectively assembled to the tool changer Two mounting ends of the arm body, each of the jaw assemblies includes two clamping members, a tension spring and a stopping member, and the two clamping members are oppositely disposed on one of the body of the tool changing arm The clamping member includes an opposite clamping end and an abutting end, wherein the clamping end of each clamping member protrudes from the mounting end, and the tension spring comprises opposite ends, the tension spring The two ends are respectively fixed at the abutting ends of the two clamping members, and the stopping members are mounted on the tool changing arm body and are subjected to an elastic force, and can be interposed between the two clamping members. Capable of supporting the two abutting ends of the two clamping members; and a locking knife control assembly, the group thereof Mounted on the body and including a driving unit and a top abutting unit, the top abutting unit is combined with the driving unit and includes two supporting portions, the top abutting unit is driven by the driving unit to be the sliding sleeve assembly Rotating for the center, the positions of the two abutting portions are corresponding to the two stoppers of the jaw assembly, and can be respectively abutted against the two stoppers.

The tool changing device capable of locking the knife in advance, wherein the abutting unit comprises a rotating member and two top abutting blocks, the rotating member is annular and sleeved on the sliding sleeve assembly of the body, the rotating member The rotatably coupled to the body and coupled to the driving unit, each of the top abutting blocks has a trapezoidal block shape and includes a sloped surface, and the top abutting blocks are coupled to the rotating member to form the two abutting portions And the two inclined faces of the two abutting blocks face in opposite directions.

The tool changing device capable of locking the knife in advance, wherein the locking knife control assembly comprises a connecting member, a second blocking piece and a cam bearing, the connecting member comprising a groove extending through two sides of the connecting member. The connecting member is coupled to the rotating member, and the two blocking members are respectively coupled to the two sides of the connecting member and surround the groove to form an active space. The cam bearing is coupled to the driving unit and driven by the driving unit The cam bearing is rotatably received in the movable space.

The tool changing device capable of locking the knife in advance, wherein the driving unit is a pressure cylinder and includes a driving rod, the locking knife control assembly includes a joint, and the joint is coupled to the free end of the driving rod. The cam bearing is coupled to the joint.

The tool changing device capable of locking the knife in advance, wherein the rotating member comprises a coupling flange, the coupling flange is disposed at an outer edge of the rotating member, and the connecting member is coupled to the coupling flange.

The tool changing device capable of locking the knife in advance, wherein each of the clamping members comprises an abutting protrusion, the abutting protrusion is adjacent to the abutting end of the clamping member, and the two clamping members of the clamping jaw assembly Faced against the projections, the two abutment projections of the two jaws of each jaw assembly abut against the stops of each jaw assembly.

The tool changing device capable of locking the knife in advance, wherein each clamping member comprises a coupling concave portion adjacent to the abutting end of the clamping member and facing the abutting convex portion of the clamping member, each facing The two engaging recesses of the two clamping members of the jaw assembly face each other, and the two ends of the tension spring of each jaw assembly are respectively fixed to the two coupling recesses of the two clamping members of each jaw assembly.

The tool changing device capable of locking the knife in advance, wherein each of the jaw assemblies includes a compression spring, the compression spring includes opposite ends, one end of the compression spring abuts against the stopper of the jaw assembly, The other end of the compression spring abuts the tool change arm assembly.

The tool changing device capable of locking the knife in advance, wherein each clamping member comprises a limiting notch, the limiting notch is disposed at an abutting end of the clamping member and opposite to the abutting convex portion of the clamping member In the direction, the two retaining notches of the two clamping members of the jaw assemblies face in opposite directions, each jaw assembly includes two limiting pins, and the two limiting pins are assembled through one of the jaw assemblies. And the two of the retaining notches are abutted by the two retaining notches of the two clamping members of the jaw assembly.

The enhancements obtained by the technical means of the creation are as follows: 1. The tool change device of the present invention capable of locking the knife in advance is provided with a lock knife control component, which can be controlled by the lock knife control component before the tool change arm assembly leaves the body Whether the knife is locked or not can improve the stability when replacing the tool. 2. Each of the clips of the present invention is provided with a stop notch, and the two retaining notches of the two clips of each jaw assembly face in opposite directions and are opposite to the stoppers of the jaw assemblies, and the jaw assemblies of the present invention Two limiting pins are provided, and the two limiting pins pass through the body of the tool changing arm, and respectively pass through the two limiting notches of the two clamping members, thereby limiting the movement of the two clamping members and avoiding the two abutting of the two clamping members The end of the tool body is highlighted when the end is in operation. 3. The cam bearing of the lock knife control component of the present invention can roll in the groove of the joint member, and the setting of the connecting rod or the floating mechanism can be eliminated, so that the top abutting unit can smoothly rotate.

In order to understand the technical features and practical functions of the present work in detail, and in accordance with the creative content, the following further describes the preferred embodiment as shown in the following figure:

As shown in FIG. 1 , a preferred embodiment of the knife changing device capable of locking the knife in advance comprises: a body 10, a tool change arm assembly 20, two jaw assemblies 30 and a lock knife control assembly 40; The tool change arm assembly 20 and the lock knife control assembly 40 are assembled to the body 10, and the jaw assemblies 30 are assembled to the tool change arm assembly 20.

As shown in FIG. 1 , the body 10 includes a casing 11 , a driving assembly (not shown) and a sliding sleeve assembly 12 . The driving assembly is mounted inside the casing 11 and includes a worm wheel. The driving component of the cam group, the roller cam, and the like is not described herein because the driving component of the tool changing device is a prior art; the sliding sleeve assembly 12 includes an axial direction, a spindle 121 and a sliding sleeve 122. A portion of the mandrel 121 is mounted inside the casing 11 and is rotatable in connection with the driving assembly. Another portion of the mandrel 121 protrudes from the casing 11, and the sliding sleeve 122 is sleeved on the mandrel. A portion of the casing 11 protrudes and reciprocates along the axial direction of the sleeve assembly 12.

As shown in FIG. 1 , FIG. 2 and FIG. 5 , the tool changer arm assembly 20 includes a tool change arm body 21 and a second stop block 22 . The tool change arm body 21 includes two opposite mounting ends. The first joint portion 211, the second joint portion 212, a mounting space 213, a stopper hole 214 and a through hole 215 are formed, and the first joint portion 211 and the second joint portion 212 are plated. The second joint portion 212 is located between the first joint portion 211 and the body 10, and the installation space 213 is interposed between the first joint portion 211 and the second joint portion 212. The stopper hole 214 extends through the first joint portion 211 and communicates with the installation space 213 . The through hole 215 extends through the second joint portion 212 and communicates with the installation space 213 . The two stoppers 22 are coupled to the tool change arm body 21 . And respectively blocking the two stop holes 214 provided by the two mounting ends.

As shown in FIG. 1 , FIG. 2 and FIG. 7 , the two clamping jaw assemblies 30 are respectively assembled on the two mounting ends of the tool changing arm body 21 . For convenience of description, the two mounting ends are further divided into a first one. The mounting end and a second mounting end are described with respect to only one of the jaw assemblies 30 assembled to the first mounting end of the tool changing arm body 21: the jaw assembly 30 includes two clamping members 31 The two pivots 32, a tension spring 33, a stop member 34, a compression spring 35 and two limit pins 36; wherein the two clamp members 31 are oppositely pivotally disposed on the tool change arm body 21, The clip member 31 includes a clip end, an abutment end, a clip arc 311, a stop notch 312, an abutment protrusion 313, and a pivot. The hole 314 and a coupling recess 315.

The clamping end of the clamping member 31 is opposite to the abutting end, and the clamping end of the clamping member 31 protrudes from the corresponding mounting end of the tool changing arm body 21, that is, the clamping jaw assembly 30 is mounted. The first mounting end is disposed at the clamping end of the clamping member 31. The locking notch 312 is disposed at the abutting end of the clamping member 31, and the limiting notch 312 is The clamping arc 311 faces in an opposite direction, and the abutting convex portion 313 is in a square shape and adjacent to the abutting end of the clamping member 31. The abutting convex portion 313 and the limiting notch 312 face in opposite directions, the pivot The hole 314 is disposed in the middle of the clamping member 31. The coupling recess 315 is adjacent to the abutting end of the clamping member 31. The coupling recess 315 faces the same direction as the abutting convex portion 313. The two clamping members 31 are opposite to each other. The mounting space 213 is disposed between the first joint portion 211 and the second joint portion 212, and the two arcing edges 311 of the two clamping members 31 face and face the installation space 213. The two abutting protrusions 313 of the clamping member 31 face each other, and the two coupling recesses 315 of the two clamping members 31 face each other.

After the two pivots 32 pass through the second joint portion 212 and the two pivot holes 314 of the two clamping members 31, the first joint portion 211 is passed through, and each pivot shaft 32 is respectively provided with a C at the end portion. The retaining arm body 21 is fixed to the tool changing arm body 21, and the two pivoting members 32 are respectively pivotally coupled to the first mounting end of the tool changing arm body 21; the tension spring 33 includes The two ends of the tensioning springs 33 are respectively disposed at the first mounting ends of the tool-changing arm bodies 21, and the two ends of the tensioning springs 33 are respectively fixed to the two coupling recesses 315 of the two clamping members 31. When the tension spring 33 is in the unstretched state, the tension spring 33 pulls the abutting ends of the two clamping members 31 to open the two clamping ends of the two clamping members 31.

The stopping member 34 includes a supporting portion 341, a spring receiving hole 342 and an abutting portion 343. The supporting portion 341 includes opposite ends, and the spring receiving hole 342 is disposed in the supporting portion 341. One end, the abutting portion 343 is disposed at the other end of the supporting portion 341, and the stopping member 34 is disposed at the stopper hole 214 of the first mounting end of the tool changing arm body 21, and The abutting portion 343 of the stopping member 34 passes through the through hole 215 provided at the first mounting end of the tool changing arm body 21, and passes through the second joint portion 212 provided at the mounting end, and faces the body 10.

The compression spring 35 is interposed between the stopper 34 and a stopper 22 that blocks the stopper hole 214. The compression spring 35 includes opposite ends, and one end of the compression spring 35 extends into the stopper The spring receiving hole 342 of the stopping member 34 abuts against the abutting portion 341 of the stopping member 34, and the other end of the compression spring 35 abuts against the stopper 22 of the blocking member receiving hole 214.

The two limiting pins 36 pass through the second joint portion 212 of the first mounting end, respectively pass through the two limiting notches 312 of the two clamping members 31, and pass through the first joint portion 211 of the first mounting end. The two limiting pins 36 can limit the movement of the two clamping members 31 to prevent the two abutting ends of the two clamping members 31 from protruding the tool changing arm body 21 during operation.

As shown in FIG. 1 , FIG. 3 and FIG. 5 , the lock knife control assembly 40 is assembled to the body 10 and includes a driving unit 41 , a top abutting unit 42 , a connecting member 43 , a second blocking piece 44 , a joint 45 , and a cam bearing 46; wherein the driving unit 41 is coupled to the casing 11 of the body 10 through a body M. In the preferred embodiment of the present invention, the driving unit 41 is a cylinder and includes an energy source. A driving rod 411 that reciprocates up and down.

The abutting unit 42 is rotatably coupled to the casing 11 of the body 10 around the sliding sleeve assembly 12 and includes two abutting portions, and the positions of the abutting portions correspond to the first of the tool changing arm bodies 21 The two stoppers 214 of the mounting end and the second mounting end are disposed with the two stoppers 34 of the jaw assembly 30. In the preferred embodiment of the present invention, the abutting unit 42 includes a The rotating member 421 and the two abutting blocks 422 are formed in an annular sheet shape and include a positioning hole 4211 and a coupling flange 4212. The positioning hole 4211 is disposed at an intermediate position of the rotating member 421, and the rotating member 421 is The positioning hole 4211 is disposed on the mandrel 121 of the sliding sleeve assembly 12 of the body 10, and is coupled to the casing 11 through a fixing flange F. The fixing flange F is locked to the casing 11 and The positioning flange 15 is disposed, and the outer diameter of the positioning flange F1 is disposed corresponding to the aperture of the positioning hole 4211. The positioning flange F1 passes through the positioning hole 4211, so that the fixing flange F and the casing 11 are common. The rotating member 421 is clamped, and the rotating member 421 is rotatably coupled to the casing 11. The coupling flange 4212 is radially protruded from the rotating member 421. The outer edge of the member 421 has a trapezoidal block shape and includes a slope 4221. The two abutting blocks 422 are coupled to the two blocking members 34 of the jaw assembly 30 to be coupled to the rotating member 421 to form the above. The two abutting portions 422 face the change arm assembly 20, and the two inclined faces 4221 of the two abutting blocks 422 face in opposite directions.

The connecting member 43 has a block shape and includes a pair of opposite sides and a groove 431 extending through the two sides of the connecting member 43. The connecting member 43 is coupled to the coupling flange 4212 of the rotating member 421 and the groove 431 faces. The body 10 is respectively coupled to the two sides of the connecting member 43 and surrounds the groove 431 to form an active space; the joint 45 is coupled to the free end of the driving rod 411 of the driving unit 41 facing upward. The cam bearing 46 is coupled to the driving unit 41 in conjunction with the joint 45, and the cam bearing 46 is rotatably received by the recess 431 of the connecting member 43 and the two flaps 44. space.

As shown in FIG. 3 and FIG. 4, when the tool changer arm assembly 20 is moved closer to the body 10 and the tool change is to be performed, the present invention is in a state of locking the knife, and the two clamp members 31 of the jaw assemblies 30 are clamped together. Then, the driving rod 411 of the driving unit 41 of the locking knife control assembly 40 is actuated downwardly, and the connecting member 43 is pulled by the cam bearing 46 coupled to the joint 45 through the joint 45 coupled to the driving rod 411. The abutting unit 42 coupled with the connecting member 43 is rotated in the counterclockwise direction of FIG. 4 centering on the sliding sleeve assembly 12, and the two abutting blocks of the rotating member 421 of the abutting unit 42 are coupled. 422 is rotated; as shown in FIG. 5, the following is also illustrated by a jaw assembly 30 assembled to the first mounting end of the tool changer body 21: a top bevel block 422 is provided with a bevel 4221 gradually abuts against the abutting portion 343 of the stop member 34 of the jaw assembly 30, the stop member 34 gradually moves toward a stop 22 of the tool change arm assembly 20, and gradually compresses the jaw assembly 30. a compression spring 35; as shown in FIGS. 6, 7, and 8, when the abutment portion 341 of the stopper 34 is withdrawn from the jaw assembly 30 When the pieces 31 are between, the tension springs 33 of the jaw assembly 30 are in an unstretched state, and the tension springs 33 pull the two abutting ends of the two clamping members 31 closer to each other. The two clamping ends of the piece 31 are opened, so that the creation is in an unlocked state, and the tool of the magazine can enter between the two clamping members 31.

As shown in FIG. 4, FIG. 9 and FIG. 10, when the jaw assembly 30 is to be clamped, the driving rod 411 of the driving unit 41 is actuated upward, so that the abutting unit 42 is centered on the sliding sleeve assembly 12. Rotating in the clockwise direction of FIG. 4, the abutting block 422 is separated from the stopping member 34, and the stopping member 34 is pressed by the compression spring 35 to be reset, and the two abutting ends of the two clamping members 31 are re-attached. The opening is performed so that the two clamping ends of the two clamping members 31 are combined to form a cutter.

The tool change device capable of locking the knife in advance is provided with the lock knife control assembly 40 for driving or controlling the lock knife. The lock knife control assembly 40 can drive the drive unit 41 by using the drive unit 41. The abutting unit 42 is rotated, so that the two abutting blocks 422 of the abutting unit 42 can respectively and selectively abut against the two stopping members 34 of the two jaw assemblies 30, and the two abutting blocks 422 are in the tool changing Before the arm assembly 20 leaves the body 10, the two retaining members 34 can be separated from each other with the rotation of the rotating member 421 of the abutting unit 42 to reset the blocking member 34 of each jaw assembly 30 again. Between the two clamps 31 of each jaw assembly 30, the creation is in the state of the lock knife; compared to the existing tool change arm structure, the creation can be before the change arm assembly 20 leaves the body 10 It is in the state of locking knife in advance, which can improve the stability when replacing the tool.

10‧‧‧ Ontology
11‧‧‧Shell
12‧‧‧Sleeve assembly
121‧‧‧ mandrel
122‧‧‧Sleeve
20‧‧‧Changer arm assembly
21‧‧‧Changer arm body
211‧‧‧ first joint
212‧‧‧Second junction
213‧‧‧ installation space
214‧‧‧stop hole
215‧‧‧Perforation
22‧‧‧block
30‧‧‧ jaw assembly
31‧‧‧Clamping parts
311‧‧‧Clamping arc
312‧‧‧ Limiting gap
313‧‧‧Resist the convex
314‧‧‧Pivot hole
315‧‧‧ combined recess
32‧‧‧ pivot
33‧‧‧ stretching spring
34‧‧‧stops
341‧‧‧Support section
342‧‧‧Spring hole
343‧‧‧The top section
35‧‧‧Compression spring
36‧‧‧ Limit pin
40‧‧‧Lock knife control unit
41‧‧‧Drive unit
411‧‧‧ drive rod
42‧‧‧Abutment unit
421‧‧‧Rotating parts
4211‧‧‧Positioning holes
4212‧‧‧Bound flange
422‧‧‧Top block
43‧‧‧Links
44‧‧‧Block
45‧‧‧Connectors
46‧‧‧ cam bearing

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view showing the appearance of a preferred embodiment of the present invention. Figure 2 is an exploded view of a portion of the preferred embodiment of the present invention. Figure 3 is an exploded view of a portion of the preferred embodiment of the present invention. Figure 4 is a perspective view showing the appearance of the preferred embodiment of the present invention. Figure 5 is a plan view of the preferred embodiment of the present invention when actuated. Figure 6 is a partial cross-sectional view showing the preferred embodiment of the present invention when the knife is not locked. Figure 7 is a partial front elevational view of the preferred embodiment of the present invention when the knife is not locked. Figure 8 is a partial plan view of the preferred embodiment of the present invention when the knife is not locked. Figure 9 is a partial cross-sectional view showing the preferred embodiment of the present invention when the knife is locked. Figure 10 is a partial front elevational view of the preferred embodiment of the present invention when the knife is locked.

10‧‧‧ Ontology

11‧‧‧Shell

12‧‧‧Sleeve assembly

121‧‧‧ mandrel

122‧‧‧Sleeve

20‧‧‧Changer arm assembly

21‧‧‧Changer arm body

211‧‧‧ first joint

212‧‧‧Second junction

22‧‧‧block

30‧‧‧ jaw assembly

31‧‧‧Clamping parts

40‧‧‧Lock knife control unit

41‧‧‧Drive unit

42‧‧‧Abutment unit

421‧‧‧Rotating parts

422‧‧‧Top block

43‧‧‧Links

44‧‧‧Block

45‧‧‧Connectors

Claims (9)

A knife changing device capable of locking a knife in advance comprises: a body comprising a rotatable sliding sleeve assembly; a tool changing arm assembly assembled to the sliding sleeve assembly and including a tool changing arm body, the tool changing The arm body includes opposite two mounting ends, and the middle section of the tool changing arm body is coupled to the sliding sleeve assembly; the two jaw assemblies are assembled to the two mounting ends of the tool changing arm body respectively Each of the jaw assemblies includes two clamping members, a tension spring and a stopping member, and the two clamping members are oppositely disposed at one of the mounting ends of the tool changing arm body, and each clamping member comprises An opposite clamping end and an abutting end, wherein the clamping end of each clamping member protrudes from a corresponding mounting end of the tool changing arm body, the tension spring comprises opposite ends, the pulling The two ends of the extension spring are respectively fixed to the abutting ends of the two clamping members, and the stopping members are mounted on the body of the tool changing arm and are subjected to an elastic force, and can be interposed between the two clamping members. And can support the two abutting ends of the two clamping members; and a locking knife control component, the group thereof Mounted on the body and including a driving unit and a top abutting unit, the top abutting unit is combined with the driving unit and includes two supporting portions, the top abutting unit is driven by the driving unit to be the sliding sleeve assembly Rotating for the center, the positions of the two abutting portions are corresponding to the two stoppers of the jaw assembly, and can be respectively abutted against the two stoppers. The tool changing device capable of locking the knife in advance according to claim 1, wherein the abutting unit comprises a rotating member and two abutting blocks, and the rotating member is annular and sleeved on the sliding sleeve assembly of the body. The rotating member is rotatably coupled to the body and coupled to the driving unit, each of the top abutting blocks has a trapezoidal block shape and includes a sloped surface, and the top abutting block is coupled to the rotating member to form the Two abutting portions, and the two inclined faces of the two abutting blocks face in opposite directions. The knife changing device capable of locking the knife in advance according to claim 2, wherein the locking knife control assembly comprises a connecting member, a second blocking piece and a cam bearing, the connecting member comprising a side of the connecting member a groove is coupled to the rotating member, and the two blocking members are respectively coupled to the two sides of the connecting member and surround the groove to form an active space, and the cam bearing is coupled to the driving unit and receives Driven by a drive unit, the cam bearing is rotatably received in the active space. The tool changing device capable of locking the knife in advance according to claim 3, wherein the driving unit is a pressure cylinder and includes a driving rod, the locking knife control assembly includes a joint, and the joint is coupled to the driving rod The free end of the cam bearing is coupled to the joint. The tool changing device capable of locking the knife in advance according to claim 4, wherein the rotating member comprises a coupling flange, the coupling flange is disposed at an outer edge of the rotating member, and the coupling member is coupled to the coupling convex edge. The knife changing device capable of locking the knife in advance according to claim 5, wherein each of the clamping members comprises an abutting protrusion, the abutting protrusion is adjacent to the abutting end of the clamping member, and the two clamping members of the clamping jaw assembly The two abutting projections of the workpiece face each other, and the two abutting projections of the two jaws of each jaw assembly abut against the stopper of each jaw assembly. The knife changing device capable of locking the knife in advance according to claim 6, wherein each of the clamping members comprises a coupling recess, the coupling recess being adjacent to the abutting end of the clamping member and facing the abutting convex portion of the clamping member In the same direction, the two engaging recesses of the two clamping members of the jaw assemblies face each other, and the two ends of the tension spring of each jaw assembly are respectively fixed to the two coupling recesses of the two clamping members of the jaw assembly. The knife changing device capable of locking the knife in advance according to claim 7, wherein each of the jaw assemblies includes a compression spring, the compression spring including opposite ends, one end of the compression spring abutting the jaw assembly a stopper, the other end of the compression spring abuts against the tool change arm assembly. The knife changing device capable of locking the knife in advance according to any one of claims 1 to 8, wherein each of the clamping members comprises a limiting notch, the limiting notch being disposed at an abutting end of the clamping member and The abutting protrusions of the clamping member face in opposite directions, the two locking notches of the two clamping members of the jaw assemblies face in opposite directions, and each jaw assembly includes two limiting pins, and the two limiting pins pass through the clip One of the mounting ends of the jaw assembly is assembled, and the two retaining notches are abutted by the two retaining notches of the two clamping members of the jaw assembly.