A cutting machine knife holder for convenient replacement of cutting knives

Abstract

The present invention relates to the field of cutting machine technology. The purpose is to provide a cutting machine including a base body and a cutting knife, wherein the base body is provided with a cutting knife insertion cavity, and the cutting knife insertion cavity extends from the upper part of the base body to the lower end of the base body; the cutting knife is inserted into the cutting knife insertion cavity and locked by a pneumatic cutting knife locking mechanism; the pneumatic cutting knife locking mechanism includes a pressure locking cavity provided in the base body on the right side of the cutting knife insertion cavity, and the pressure locking cavity and the cutting knife insertion cavity are connected by a connecting cavity; the size of the connecting cavity is smaller than the pressure locking cavity. The present invention adopts a pneumatic locking method, which can quickly complete the clamping and unlocking of the cutting knife, facilitating rapid and automatic cutting knife changing.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting machines, and in particular to a cutting machine knife holder which is convenient for replacing a cutting knife. Background Art

[0002] The CNC cutting bed is a type of cutting equipment widely used in garment processing. It achieves precise cutting of the fabric on the bed by precisely driving the cutting head to move on the bed, which can greatly increase the cutting speed and achieve fine cutting of the fabric, thereby reducing the cost of fabric and improving the utilization rate of fabric. The CNC cutting bed mainly includes a bed, a gantry mounted on the bed that can move along the length of the bed, and a cutting head mounted on the gantry that can move along the length of the gantry (the width of the bed). When in use, the cutting head runs according to a preset trajectory, and the fabric is cut by the cutter installed on the cutting head. However, the existing CNC cutting beds still have the following problems during use:

[0003] 1. When cutting fabric, the cutter must move according to the desired shape of the material. This shape is often not a simple straight line but involves many corners, arcs, and other non-linear shapes. This requires the cutter's edge to be able to change its orientation in real time to adapt to the cutting requirements. While existing cutters can change the direction of the cutting edge by rotating the cutting head as a whole, the overall installation layout is not compact and sophisticated, resulting in a large cutting head, and operational stability needs to be improved.

[0004] To improve cutting quality, existing CNC cutting machines generally use vibrating blades to cut fabric. These blades vibrate at high speeds, subjecting the cutter to high-frequency vibrations during use. These blades are typically secured only by mechanical screw locks. Electronic locking mechanisms, such as electromagnetic pushers, are not suitable. Furthermore, since the cutter is a consumable component, screw locks and other methods are not suitable for automated blade changing. This is why existing CNC cutting machines cannot achieve fully automated, unmanned operation.

[0005] 3. Since CNC cutting machines often operate on flexible materials such as fabric, especially when cutting multiple layers of fabric, they often require compacting the fabric to ensure precise positioning of the cutter. Currently, a common practice in the prior art is to use a retractable cloth pressing head to press the fabric to assist in positioning the cutter and achieve precise cutting. However, existing cloth pressing heads are typically a ring-shaped body positioned outside the cutter body. By driving the cloth pressing head downward, the cloth is pressed and positioned at the area where the cutter is to cut. However, this simple ring-shaped cloth pressing head always has a certain amount of friction between its bottom surface (i.e., the contact surface with the fabric). During operation, this friction can easily pull on the fabric, causing it to shift out of position and risking miscutting. Although the prior art design of the cloth pressing head's bottom surface with a curved chamfer can mitigate this adverse effect to a certain extent, this side effect is still significant when the cutting head operates at high speeds, which also restricts the overall operating efficiency of the cutting machine. Summary of the Invention

[0006] The object of the present invention is to provide a cutting machine knife holder which can be quickly locked and unlocked and is convenient for replacing the cutting knife.

[0007] To achieve the above-mentioned object, the technical solution adopted by the present invention is a cutting machine knife holder for facilitating the replacement of a cutting knife, comprising a seat body and a cutting knife, wherein a knife insertion cavity is provided inside the seat body, and the knife insertion cavity extends from the upper portion of the seat body to the lower end of the seat body; the cutting knife is inserted into the knife insertion cavity and locked by a pneumatic knife locking mechanism;

[0008] The pneumatic knife locking mechanism includes a pressure locking chamber arranged in a seat body on the right side of the knife inserting chamber, and the pressure locking chamber is connected to the knife inserting chamber through a connecting chamber; the size of the connecting chamber is smaller than the pressure locking chamber; a knife pressing body is also provided in the seat body, and the knife pressing body is composed of a knife-resisting piston section and a pressure-bearing piston section, and the knife-resisting piston section is installed in the connecting chamber and forms a gas-tight, transversely sliding fit with the connecting chamber; the pressure-bearing piston section is installed in the pressure locking chamber and forms a gas-tight, transversely sliding fit with the pressure locking chamber; the chamber of the pressure locking chamber located on the left side of the pressure-bearing piston section is a low-pressure chamber, and the chamber located on the right side of the pressure-bearing piston section is a high-pressure chamber; a one-way air supply port connected to the high-pressure chamber is also provided on the right side wall of the seat body, and a one-way exhaust port connected to the low-pressure chamber is provided at the bottom of the seat body;

[0009] A pressure balance lock is also provided in the seat body above the pressure locking chamber, and the pressure balance lock can be switched between an unlocked state and a locked state; when the pressure balance lock is switched to the unlocked state, the air paths of the high-pressure chamber and the low-pressure chamber of the pressure locking chamber are connected; when the pressure balance lock is switched to the locked state, the air paths of the high-pressure chamber and the low-pressure chamber of the pressure locking chamber are disconnected.

[0010] Preferably, the pressure-balancing lock comprises a transverse locking hole provided on the seat body, the low-pressure chamber and the high-pressure chamber being in communication with the locking hole via a first through hole and a second through hole, respectively; a valve stem is passed through the locking hole, and a sliding fit is formed between the valve stem and the locking hole in a transverse direction; a reset member is provided between the inner end of the valve stem and the bottom of the locking hole, and the outer end of the valve stem extends outside the locking hole;

[0011] The valve stem is further provided with a central hole at its center, and a first side hole and a second side hole at its bottom, wherein the spacing between the first side hole and the second side hole matches the spacing between the first through hole and the second through hole;

[0012] When the pressure balance lock is in a locked state, the valve stem moves outward under the elastic force of the elastic reset member, and the first side hole and the second side hole on the valve stem are positioned opposite to the first through hole and the second through hole, forming an air path disconnection; when the pressure balance lock is in an unlocked state, the valve stem moves inward under the action of external pressure, and the first side hole and the second side hole on the valve stem are positioned opposite to the first through hole and the second through hole, forming an air path conduction.

[0013] Preferably, a guide cap is provided outside the locking hole, the guide cap is threadedly connected to the seat body, and a square hole is provided at the center of the guide cap; the outer section of the valve stem is square and matches the square hole.

[0014] Preferably, the reset member is a coil spring.

[0015] Preferably, the reset member is a mutually repelling magnetic plate group arranged on the bottom of the locking hole and the end of the valve stem.

[0016] Preferably, the right end surface of the pressure locking cavity is surrounded by a cover, and the cover is connected to the base body by screws.

[0017] Preferably, the cutting knife includes a handle and a knife body, and the handle is inserted in the knife insertion cavity; a trapezoidal groove is provided on the side of the handle facing the knife pressing body, and a positioning block that matches the trapezoidal groove is provided on the end face of the knife-resisting piston section of the knife pressing body; the positioning block is inserted into the trapezoidal groove to lock the knife handle.

[0018] Preferably, the upper end surface of the knife handle is provided with a first inclined surface, and the upper end surface of the knife insertion cavity is formed with a second inclined surface, and the first inclined surface matches the second inclined surface.

[0019] The beneficial effects of the present invention are mainly reflected in: the use of a pneumatic locking method can quickly complete the clamping and unlocking of the cutter, facilitating rapid and automated cutter replacement. Specifically, the locking method of the pneumatic cutter locking mechanism of the present invention is as follows: after the cutter is inserted into the cutter insertion cavity, high-pressure gas is injected into the high-pressure chamber of the pressure locking chamber through the one-way air supply port. Under the push of the high-pressure gas, the cutter pressing body moves to the left, and the gas in the low-pressure chamber is squeezed out from the one-way exhaust port. At this time, the gas in the low-pressure chamber cannot be replenished. Under the action of the high-pressure gas in the high-pressure chamber and the negative pressure in the low-pressure chamber, the cutter pressing body is tightly pressed against the cutter and cannot retreat, forming a lock on the cutter; when the cutter needs to be replaced, the pressure balance lock switches to the unlocked state. At this time, the low-pressure chamber and the high-pressure chamber are connected in the air path, and the gas in the high-pressure chamber can be quickly replenished to the low-pressure chamber. At this time, the pressure on both sides of the pressure-bearing piston section of the cutter pressing body has a balanced basis. At this time, the cutter pressing body can move left and right, thereby facilitating the removal of the cutter from the cutter insertion cavity for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 Left side view of the structure shown in;

[0022] Figure 3 It is a schematic diagram of the structure of the sliding block in a top-down state;

[0023] Figure 4 It is a structural diagram of the vibrating knife holder;

[0024] Figure 5 It is a structural diagram of the valve stem;

[0025] Figure 6 It is a structural diagram of the knife pressing body;

[0026] Figure 7 Schematic diagram of the structure of the cutting knife;

[0027] Figure 8 for Figure 4 Enlarged view of part A in the middle;

[0028] Figure 9 for Figure 9 A schematic diagram of the structure shown in FIG when the valve stem is pressed back into the locking hole;

[0029] Figure 10 for Figure 1 Enlarged view of middle part B;

[0030] Figure 11 This is a bottom view of the positioning pressure ring. DETAILED DESCRIPTION

[0031] like Figure 1-11 A CNC cutting machine, shown in FIG. , includes a bed with a cutting head mounted thereon. The cutting head is capable of freely moving along the length and width of the cutting machine to cut fabric laid flat on the bed. The present invention particularly discloses the head portion of the CNC cutting machine, which is mounted on the cutting machine's gantry to cut fabric.

[0032] like Figure 1 As shown in , the present invention includes a sliding seat 1 installed on the gantry of the cutting table and capable of moving along the width direction of the cutting table. The sliding seat 1 is clamped on the guide rail of the gantry and runs to achieve movement in the width direction. Similar to the traditional cutting table, the present invention is also provided with a lifting frame 2 above the sliding seat 1, and the lifting frame 2 is provided with a mounting frame 3 capable of moving along the height direction of the lifting frame 2, and the mounting frame 3 is provided with a cutting head 4. When in use, the mounting frame 3 can be raised by the lifting frame 2, thereby lifting the cutting head 4, which facilitates the movement of the cutting head 4 in non-cutting conditions; the mounting frame 3 can also be lowered to achieve the downward movement of the cutting head 4, and cooperate with the movement of the machine head in the length and width directions of the bed to cut the cloth.

[0033] Compared with traditional CNC cutting machines, the head part of the present invention mainly has the following three advantages: 1. The structure is compact and exquisite, which can ensure the stability of the cutting head during rotation adjustment and avoid axial deviation of the cutting head during long-term use. 2. The pneumatic locking method is adopted, which can quickly complete the clamping and unlocking of the cutting knife, and facilitate rapid knife change. 3. While ensuring the pressure of the positioning pressure ring on the fabric, it can greatly reduce the friction between the positioning pressure ring and the fabric when it moves with the cutting head, avoid the fabric from being out of place, and have a beneficial effect on improving the overall operating efficiency of the cutting machine. Below, the present invention will specifically explain the three major advantages of the present invention in conjunction with the accompanying drawings.

[0034] From the first aspect, the present invention is mainly realized by improving the optional installation structure of the cutting head 4 and improving the lifting structure thereof.

[0035] like Figure 1 As shown in the figure, the mounting frame 3 of the present invention is E-shaped and consists of side panels 5, and an upper horizontal panel 6, a middle horizontal panel 7, and a lower horizontal panel 8 arranged on the side panels 5 from top to bottom. The upper horizontal panel 6 and the middle horizontal panel 7 form an upper positioning and middle support installation form for the cutting head 4.

[0036] Specifically, an inverted conical support tube 9 is provided in the middle of the middle horizontal plate 7, and a clearance hole 10 is provided in the middle of the lower horizontal plate 8. The cutting head 4 of the present invention is generally a vibrating cutter head with high frequency vibration, which can adapt to the cutting of various types of flexible fabrics. Figure 1As shown in the figure, the cutting head 4 includes a cutter head body 11 and a vibrating blade holder 12. The vibrating blade holder 12 is arranged below the cutter head body 11 and is connected to the exciter installed in the cutter head body 11 through a vibration guide rod 13. When in use, the exciter in the cutter head body 11 generates high-frequency vibrations, which are transmitted to the vibrating actuator 12 through the vibration guide rod 13, thereby driving the vibrating blade holder 12 and the cutting blade to vibrate at a high frequency. As the entire head moves, the fabric is cut.

[0037] The cutter head body 11 of the present invention has an inverted tapered connecting neck 14 formed on the outer side of the middle portion, which matches the taper of the bracket 9. This connecting neck 14 is mounted within the bracket 9 via a tapered bearing 15. The top of the cutter head body 11 is connected to the upper horizontal plate 6 of the mounting frame 3 via a rotating platform 16. The vibrating blade seat 12 extends through the clearance hole 10 to the bottom of the lower horizontal plate 8. The mounting frame 3 is also equipped with a rotary drive mechanism capable of driving the cutter head body 11 to rotate within the bracket 9.

[0038] When nonlinear cutting such as corner cutting is required, the cutting edge can be reversed by rotating the cutting head 4 as a whole. Specifically, when the cutting head 4 is rotating and adjusting, the cutter head body 11 can be driven to rotate in the support tube 9 by the rotary drive mechanism. Since the present invention adopts an E-shaped mounting bracket 3, it can achieve upper positioning and middle support for the cutting head 4, that is, the cutter head body 11 is centrally installed through the inverted conical support tube 9 and the inverted conical connecting neck 14 on the cutter head body 11. On the one hand, it can meet the needs of rotation, and on the other hand, it can achieve central positioning through the tapered bearing 15; at the same time, the upper end of the cutting head 4 is connected to the upper horizontal plate 6 through the rotating platform 16, which can further ensure the position accuracy of the cutting head 4. During long-term use, the overall centering stability of the cutting head 4 can also be guaranteed, thereby improving the overall cutting accuracy of the cutting bed.

[0039] Regarding how to drive the cutting head 4 for circumferential rotation, the present invention offers numerous possible implementations. However, since the vibrating blade holder 12 requires high-frequency vibration, the driving point is typically not located on the vibrating blade holder 12, but rather on the cutter head body 11. For example, a ring gear is provided on the cutter head body 11, and gears mounted on the horizontal plate directly drive the ring gear, thereby driving the cutter head body 11. However, given the numerous components required on the mounting frame 3, and to achieve a more balanced overall center of gravity, components such as the drive motor 17 of the rotational drive mechanism are typically not located on the horizontal plate.

[0040] like Figure 1 and 2 As shown in the figure, the rotary drive mechanism of the present invention includes a rotary drive motor 17, which is arranged on one side of the side plate 5 of the mounting frame 3 and is located on a side of the side plate 5 away from the upper horizontal plate 6, that is, Figure 1The left side of the middle side plate 5. A driving gear 18 is provided at the output end of the driving motor 17. A driving port 19 is provided on the side plate 5 at a position opposite to the driving gear 18. The rotary drive mechanism also includes a driving ring gear 20 provided on the outer side of the cutter head body 11 below the connecting neck 14. A transmission connection is formed between the driving ring gear 20 and the driving gear 18 via a synchronous toothed belt 21 passing through the driving port 19. During adjustment, the driving motor 17 is actuated to drive the driving gear 18, and then drives the driving ring gear 20 through the synchronous toothed belt 21 to realize the rotation of the cutter head body 11, and finally drives the vibrating knife seat 12 and the cutting knife to rotate, thereby realizing the adjustment of the cutting edge direction.

[0041] When realizing the lifting and lowering adjustment of the mounting frame 3, the simplest way is undoubtedly to directly push the mounting frame 3 through an electric push rod, a cylinder, etc. However, considering the overall weight of the mounting frame 3 and the components thereon is relatively large, simply using electric push rods, cylinders, etc. will cause the accuracy to decrease after long-term use. Therefore, a better approach of the present invention can also be to combine Figure 1 and 2 As shown in FIG, the lifting frame 2 includes a top plate 22 and two vertical plates 23 with an L-shaped cross section arranged between the top plate 22 and the sliding seat 1. A vertical driving screw 24 is arranged between the vertical plates 23. The driving screw 24 is connected to a lifting motor 25 arranged on the top plate 22.

[0042] The side plate 5 of the mounting frame 3 is provided with Figure 3 The sliding block 26 shown in FIG is located on the side of the side panel 5 away from the upper horizontal panel 6. Slots 27 are provided on both sides of the sliding block 26 to engage with the vertical panels 23. The slots 27 are secured to the vertical panels 23 and form a sliding engagement with the vertical panels 23. The drive screw 24 passes through the center of the sliding block 26 and forms a threaded engagement with the sliding block 26. During operation, the lifting motor 25 rotates the drive screw 24, thereby driving the sliding block 26 along the height direction of the drive screw 24. The presence of the slots 27 ensures that the sliding block 26 operates with extremely high stability. Furthermore, a further preferred approach is to further symmetrically provide two vertical rods 28 on either side of the vertical panel 23, with their ends connected to the top panel 22 and the sliding seat 1, respectively. Sliding sleeves 29 are fixedly provided on the side panels 5 on both sides of the sliding block 26. The sliding sleeves 29 are mounted outside the vertical rods 28 and form a sliding engagement with the vertical rods 28. Through the cooperation between the sliding sleeve 29 and the vertical rod 28, and the cooperation between the clamping groove 27 on the sliding block 26 and the vertical plate 23, dual positioning and guiding are achieved, and the stability is further improved.

[0043] From the second aspect, since a vibrating knife is used and it works at high-frequency vibration at any time, the traditional method can only rely on screws to lock the cutter 31, and it is impossible to use an electrically controlled knife locking mechanism to lock the cutter 31. This makes it very difficult to achieve automated knife changing, which is not conducive to the implementation of automation and intelligence.

[0044] The present invention abandons the traditional form and adopts pneumatic method to lock the knife. Not only is the degree of automation of the knife locking high, but also because there is no electromagnetic push rod and other electronic control components, it will not be affected by high-frequency vibration and its service life is guaranteed. Figure 4 As shown in FIG, the vibrating knife holder 12 of the present invention includes a holder 30 and a cutter 31. A knife insertion cavity 32 is provided inside the holder 30. The knife insertion cavity 32 extends from the upper portion of the holder 30 to the lower end of the holder 30. The cutter 31 is inserted into the knife insertion cavity 32 and locked by a pneumatic knife locking mechanism.

[0045] Regarding the specific structural form of the pneumatic knife locking mechanism, such as Figure 4 As shown in , the pneumatic knife locking mechanism includes a pressure locking chamber 33 disposed within the base body 30 to the right of the knife insertion chamber 32. The pressure locking chamber 33 communicates with the knife insertion chamber 32 via a connecting chamber 34. To facilitate the construction and processing of the pressure locking chamber 33, the right end surface of the pressure locking chamber 33 can be enclosed by a cover 52, which is screwed to the base body 30. The connecting chamber 34 is smaller than the pressure locking chamber 33, and the pressure locking chamber 33 and the connecting chamber 34 collectively form a stepped cavity structure.

[0046] The base body 30 is also provided with a knife pressing body 35, which is located in the stepped cavity formed by the pressure locking cavity 33 and the connecting cavity 34, and through the movement of the knife pressing body 35, the cutting knife 31 in the knife inserting cavity 32 is pressed tightly. Figure 6 As shown in FIG, the knife pressing body 35 is composed of a knife-resisting piston section 36 and a pressure-bearing piston section 37. Figure 4 As shown in FIG, the knife-resisting piston segment 36 is installed in the connecting chamber 34 and forms a gas-tight, transverse sliding fit with the connecting chamber 34. The pressure-bearing piston segment 37 is installed in the pressure locking chamber 33 and forms a gas-tight, transverse sliding fit with the pressure locking chamber 33. The overall movement is as follows: the knife-pressing body 35 moves leftward to lock the cutter 31, and moves rightward to unlock the cutter 31.

[0047] As for how to drive the knife pressing body 35 to move and how to prevent the knife pressing body 35 from retreating, the method adopted by the present invention is to combine Figure 8 and 9As shown in FIG, the pressure locking chamber 33 is located on the left side of the pressure-bearing piston section 37 and is a low-pressure chamber 38, and the chamber is located on the right side of the pressure-bearing piston section 37 and is a high-pressure chamber 39. Figure 4 As shown in FIG, a one-way air supply port 40 communicating with the high-pressure chamber 39 is further provided on the right side wall of the seat body 30, and a one-way air exhaust port 41 communicating with the low-pressure chamber 38 is provided at the bottom of the seat body 30. The one-way air supply port 40 and the one-way air exhaust port 41 are both one-way hole-like components, used for air supply and exhaust, respectively.

[0048] A pressure-balancing lock is also located within the seat 30 above the pressure lock chamber 33. The lock can be switched between an unlocked and locked state. When the lock is unlocked, the high-pressure chamber 39 and the low-pressure chamber 38 of the pressure lock chamber 33 are connected. When the lock is locked, the high-pressure chamber 39 and the low-pressure chamber 38 of the pressure lock chamber 33 are disconnected.

[0049] like Figure 8 As shown in FIG, the pneumatic locking mechanism of the present invention operates as follows: After the cutter is inserted into the inserting chamber 32, high-pressure gas is injected into the high-pressure chamber 39 of the pressure locking chamber 33 through the one-way air supply port 40. This high-pressure gas pushes the cutter body 35 to the left, forcing the gas in the low-pressure chamber 38 out of the one-way exhaust port 41. At this point, the gas in the low-pressure chamber 38 cannot be replenished. Under the action of the high-pressure gas in the high-pressure chamber 39 and the negative pressure in the low-pressure chamber, the cutter body 35 is tightly pressed against the cutter 31 and cannot retreat, locking the cutter 31. When the cutter 31 needs to be replaced, the pressure balance lock is switched to the unlocked state. This allows the low-pressure chamber 38 and the high-pressure chamber 39 to communicate with each other, allowing the gas in the high-pressure chamber 39 to quickly replenish into the low-pressure chamber 38. This balances the pressure on both sides of the pressure-bearing piston section 36 of the cutter body 35, allowing the cutter body 35 to move left and right, thereby facilitating the removal of the cutter 31 from the inserting chamber 32 for replacement.

[0050] As long as the functions of gas line connection and gas line disconnection can be realized and switched, the requirements of the pressure balance lock of the present invention can be met. However, in order to facilitate the subsequent automatic tool change, the pressure balance lock should be easy to operate and stable and reliable.

[0051] Therefore Figure 8 and 9As shown in , the pressure balance lock of the present invention includes a transverse locking hole 42 provided on the seat body 30, and the low-pressure chamber 38 and the high-pressure chamber 39 are connected to the locking hole 42 through the first through hole 43 and the second through hole 44 respectively. A valve stem 45 is passed through the locking hole 42, and a sliding fit is formed between the valve stem 45 and the locking hole 42 in the transverse direction. A reset member 46 is provided between the inner end of the valve stem 45 and the bottom of the locking hole 42, and the outer end of the valve stem 45 extends outside the locking hole 42. The reset member 46 can be a coil spring or a spring as shown in FIG. Figure 8 As shown in FIG, the reset element 46 is a set of mutually repelling magnetic disks disposed at the bottom of the locking hole 42 and the end of the valve stem 45. The mutual repulsion of the magnetic disks enables the valve stem 45 to maintain a stable state when not subjected to external forces. The left-right movement of the valve stem 45 achieves switching between on and off.

[0052] Its specific structure is that a center hole 47 is also provided at the center of the valve stem 45, and a first side hole 48 and a second side hole 49 are provided at the bottom of the valve stem 45. The spacing between the first side hole 48 and the second side hole 49 matches the spacing between the first through hole 43 and the second through hole 44.

[0053] When the pressure balance lock is in the locked state, Figure 9 As shown in , the valve stem 45 moves outward under the elastic force of the elastic reset member 46, and the first side hole 48 and the second side hole 49 on the valve stem 45 are positioned to intersect with the first through hole 43 and the second through hole 44, forming an air path disconnection. Figure 8 As shown in , when the pressure balance lock is in the unlocked state, the valve stem 45 moves inward under the action of external pressure, and the first side hole 48 and the second side hole 49 on the valve stem 45 are opposite to the first through hole 43 and the second through hole 44, forming an air path conduction.

[0054] When it is necessary to cooperate with the subsequent automatic tool change, it is only necessary to set a retractable electric push rod and a retractable air nozzle on the tool change device. The electric push rod and the air nozzle are respectively opposite to the outer end of the valve stem 45 and the one-way air supply port 40. By switching between the two and retracting them alternately, the cutting knife 31 can be locked and unlocked, and the tool removal device can be used to realize automatic and rapid tool change.

[0055] The first side hole 48 and the second side hole 49 of the present invention should always face downward to ensure that they correspond to the first through hole 43 and the second through hole 44. To this end, a better approach of the present invention is to design the locking hole 42 and the valve stem 45 into a square shape. Or, as Figure 8 As shown in FIG, a guide cap 50 is provided outside the locking hole 42, and the guide cap 50 is threadedly connected to the seat body 30. A square hole 51 is provided in the center of the guide cap 50. Figure 5 As shown in FIG, the outer section of the valve stem 45 is in a square shape that matches the square hole 51.

[0056] On this basis, in order to further achieve stable locking of the cutter 31, as Figure 7 As shown in FIG, the cutting knife 31 includes a handle 53 and a knife body 54, and the handle 53 is inserted into the knife insertion cavity 32. The handle 53 is provided with a trapezoidal groove 55 on one side facing the knife pressing body 35, as shown in FIG. Figure 6 As shown in the figure, a positioning block 56 that cooperates with the trapezoidal groove 55 is provided on the end face of the knife-pressing piston section 36 of the knife-pressing body 35. The positioning block 56 is inserted into the trapezoidal groove 55 to lock the knife handle 53. Through the trapezoidal groove 55 and the two inclined surfaces at the upper and lower parts of the positioning block 56, the present invention can better achieve the positioning and installation of the cutting knife 31. Similarly, the present invention can also be provided with a first inclined surface 57 on the upper end face of the knife handle 53, and a second inclined surface 58 is formed on the upper end face of the knife insertion cavity 32. The first inclined surface 57 cooperates with the second inclined surface 58 to achieve better positioning of the cutting knife 31.

[0057] From the third aspect, the present invention also changes the problem of large friction between the traditional positioning pressure ring 59 and the cloth, so that the positioning pressure ring 59 can not only press the cloth stably, but also reduce the friction between the cloth, laying the foundation for the high-speed operation of the cutting table.

[0058] From this perspective, if Figure 1 and 10 As shown in FIG, the head portion of the present invention includes, in addition to the mounting frame 3 and the cutting head 4 disposed on the mounting frame 3, a positioning pressure ring 59 disposed at the bottom of the mounting frame 3 and cooperating with the cutting head 4. The positioning pressure ring 59 is located outside the cutting blade 31 of the cutting head 4 and can be raised and lowered on the mounting frame 3 under the drive of the pressure ring driving mechanism.

[0059] Since it does not need to contact the vibrating blade holder 12, its specific lifting forms are various. For example, the pressure ring drive mechanism includes a lifting rod 67 provided on the mounting frame 3. The lifting rod 67 and the mounting frame 3 form a vertical sliding fit. To further improve stability, the lifting rod 67 can be inserted into a guide sleeve on the mounting frame 3. The upper end of the lifting rod 67 is provided with a rack 68, and the lower end of the lifting rod 67 is connected to the ring body 60. The rack 68 meshes with the lifting gear 69, which is driven by the pressure ring adjustment motor. Of course, a linear electric push rod can also be used to directly push the lifting rod 67.

[0060] But the positioning ring 59 of the present invention is particularly special in that, Figure 10As shown in , the positioning pressure ring 59 includes a ring body 60, the bottom of the ring body 60 is provided with an annular mounting groove 61, and a rotating ring 62 is provided in the mounting groove 61, and the rotating ring 62 forms a sliding fit with the mounting groove 61. The positioning pressure ring 59 of the present invention can move downward under the drive of the pressure ring driving mechanism during operation to achieve pressing on the cloth. When the cutting head 4 moves, since the positioning pressure ring 59 of the present invention is in direct contact with the cloth through the rotating ring 62, and the rotating ring 62 can rotate in the mounting groove 61 of the ring body 60, the rotation of the rotating ring 62 can release the friction force, play a role in reducing friction, and improve the smoothness of the positioning pressure ring 59 in the relative movement with the cloth; laying a solid foundation for the high-speed operation of the cutting head 4 of the cutting table.

[0061] On this basis, to further reduce friction, a better approach is to evenly define a plurality of ball grooves 63 at the bottom of the rotating ring 62, each containing contact balls 64 that can rotate freely within the grooves 63. Through the dual rotation of the contact balls 64 and the rotating ring 62, the present invention can better exert friction, thereby greatly improving running smoothness and preventing adverse pulling on the fabric.

[0062] Furthermore, the bottom of the mounting groove 61 of the present invention is provided with an annular guide rib 65 extending along the length of the mounting groove 61. The top of the rotating ring 62 is provided with a guide groove 66 that matches the guide rib 65. The rotating ring 62 is clamped on the guide rib 65 via the guide groove 66. The cooperation between the guide groove 66 and the guide rib 65 makes the rotating ring 62 more stable during rotation, thereby reducing its swing. However, to prevent the guide rib 65 from interfering with the rotation of the rotating ring 62, the cross-sections of the guide rib 65 and the guide groove 66 are generally semicircular. This allows the guide rib 65 to provide rotational guidance for the rotating ring 62 without affecting the rotational flexibility of the rotating ring 62.

Claims

1. A cutting machine knife holder for facilitating the replacement of a cutting knife, comprising a holder (30) and a cutting knife (31), characterized in that: The seat (30) is provided with a knife insertion cavity (32) inside, and the knife insertion cavity (32) extends from the upper part of the seat (30) to the lower end of the seat (30); the cutting knife (31) is inserted into the knife insertion cavity (32) and is locked by a pneumatic knife locking mechanism; The pneumatic knife locking mechanism comprises a pressure locking chamber (33) arranged in a seat body (30) on the right side of the knife inserting chamber (32), wherein the pressure locking chamber (33) is communicated with the knife inserting chamber (32) via a connecting chamber (34); the size of the connecting chamber (34) is smaller than that of the pressure locking chamber (33); a knife pressing body (35) is further arranged in the seat body (30), wherein the knife pressing body (35) is composed of a knife-resisting piston section (36) and a pressure-bearing piston section (37); the knife-resisting piston section (36) is installed in the connecting chamber (34) and forms a gas-tight, horizontally sealing member with the connecting chamber (34). The pressure-bearing piston section (37) is installed in the pressure locking chamber (33) and forms a gas-tight, lateral sliding fit with the pressure locking chamber (33); the chamber of the pressure locking chamber (33) located on the left side of the pressure-bearing piston section (37) is a low-pressure chamber (38), and the chamber located on the right side of the pressure-bearing piston section (37) is a high-pressure chamber (39); a one-way air supply port (40) communicating with the high-pressure chamber (39) is further provided on the right side wall of the seat body (30), and a one-way exhaust port (41) communicating with the low-pressure chamber (38) is provided at the bottom of the seat body (30); A pressure balance lock is further provided in the seat (30) above the pressure locking chamber (33), and the pressure balance lock can be switched between an unlocked state and a locked state; when the pressure balance lock is switched to the unlocked state, the gas paths of the high-pressure chamber (39) and the low-pressure chamber (38) of the pressure locking chamber (33) are connected; when the pressure balance lock is switched to the locked state, the gas paths of the high-pressure chamber (39) and the low-pressure chamber (38) of the pressure locking chamber (33) are disconnected.

2. The cutting machine knife holder for facilitating knife replacement according to claim 1, characterized in that: The pressure balance lock comprises a transverse locking hole (42) provided on the seat body (30), wherein the low-pressure chamber (38) and the high-pressure chamber (39) are respectively connected to the locking hole (42) through a first through hole (43) and a second through hole (44); a valve stem (45) is provided in the locking hole (42), and a sliding fit is formed between the valve stem (45) and the locking hole (42) in the transverse direction; a reset member (46) is provided between the inner end of the valve stem (45) and the bottom of the locking hole (42), and the outer end of the valve stem (45) extends outside the locking hole (42); The center of the valve stem (45) is further provided with a center hole (47), and the bottom of the valve stem (45) is provided with a first side hole (48) and a second side hole (49), and the spacing between the first side hole (48) and the second side hole (49) matches the spacing between the first through hole (43) and the second through hole (44); When the pressure balance lock is in a locked state, the valve stem (45) moves outward under the elastic force of the elastic reset member (46), and the first side hole (48) and the second side hole (49) on the valve stem (45) are positioned opposite to the first through hole (43) and the second through hole (44), forming an air path disconnection; when the pressure balance lock is in an unlocked state, the valve stem (45) moves inward under the action of external pressure, and the first side hole (48) and the second side hole (49) on the valve stem (45) are positioned opposite to the first through hole (43) and the second through hole (44), forming an air path conduction.

3. The cutting machine knife holder for facilitating knife replacement according to claim 2, characterized in that: A guide cap (50) is provided outside the locking hole (42), the guide cap (50) is threadedly connected to the seat body (30), and a square hole (51) is provided at the center of the guide cap (50); the outer section of the valve stem (45) is square and matches the square hole (51).

4. The cutting machine knife holder for facilitating knife replacement according to claim 3, characterized in that: The reset member (46) is a coil spring.

5. The cutting machine knife holder for facilitating knife replacement according to claim 3, characterized in that: The reset member (46) is a mutually repelling magnetic plate group arranged on the bottom of the locking hole (42) and the end of the valve stem (45).

6. The cutting machine knife holder for facilitating knife replacement according to claim 5, characterized in that: The right end surface of the pressure locking chamber (33) is surrounded by a cover (52), and the cover (52) is connected to the seat body (30) through screws.

7. The cutting machine knife holder for facilitating knife replacement according to claim 6, characterized in that: The cutting knife (31) comprises a knife handle (53) and a knife body (54), wherein the knife handle (53) is inserted into the knife inserting cavity (32); a trapezoidal groove (55) is provided on the side of the knife handle (53) facing the knife pressing body (35); a positioning block (56) matching the trapezoidal groove (55) is provided on the end surface of the knife-resisting piston section (36) of the knife pressing body (35); the positioning block (56) is inserted into the trapezoidal groove (55) to lock the knife handle (53).

8. The cutting machine knife holder for facilitating knife replacement according to claim 7, characterized in that: The upper end surface of the knife handle (53) is provided with a first inclined surface (57), and the upper end surface of the knife insertion cavity (32) is formed with a second inclined surface (58), and the first inclined surface (57) and the second inclined surface (58) are matched.

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