Composite film die-cutting forming device and method

Abstract

The present invention relates to the field of die-cutting and forming technology, and specifically discloses a die-cutting and forming device and method for a composite film, comprising: a base, an auxiliary roller, a pressure roller and a circular knife roller, the auxiliary roller, the pressure roller and the circular knife roller are all arranged in the base, the circular knife roller is provided with a die-cutting portion, and the interior of the circular knife roller is equidistantly provided with a plurality of die-cutting knife groups along its axial direction; the plurality of die-cutting knife groups are each composed of a die-cutting ring and a die-cutting knife, the die-cutting ring is rotatably assembled in the circular knife roller, the die-cutting knife is provided on the die-cutting ring, and its end portion passes through the die-cutting portion; the die-cutting and forming device and method for a composite film of the present invention, through the transmission disk rotating and moving, passing through the interior of each die-cutting ring in turn, automatically unlocking a locking rod, so that the die-cutting knife in each die-cutting ring is contracted or extended in turn, and the number of die-cutting knife groups used can be adjusted according to the width of the composite film, without replacing the circular knife roller, and can better adapt to the die-cutting processing of composite films of the same type but different widths.

Description

Technical Field

[0001] The present invention relates to the technical field of die-cutting and forming, and in particular to a die-cutting and forming device and method for a composite film. Background Art

[0002] Composite film is a functional film made of two or more layers of different materials (such as plastic film, metal foil, paper, fiber, etc.) through gluing, hot pressing and other methods. It has multiple properties such as waterproof, moisture-proof, heat-insulating, and conductive. The composite film can be processed into parts or finished products of specific shapes and sizes by cutting, indenting or shaping the composite film with a die cutter. In the die-cutting process, the composite film is usually passed under a circular knife roller, pressed by a pressure roller, and then die-cut by a rotating circular knife roller.

[0003] However, when processing composite molds, the existing die-cutting and forming equipment has poor universal performance of the circular knife roller. The cutter is often fixed to the knife roller, and the cutter coverage width cannot be adjusted according to the width of the composite film. This results in that even if composite films of the same type but different widths are die-cut, the corresponding circular knife roller needs to be replaced before die-cutting can be carried out. This requires frequent disassembly of the pressure roller to remove and place the circular knife roller, which is more troublesome and inconvenient. Summary of the Invention

[0004] The present invention provides a composite film die-cutting device and method, aiming to solve the problem in related art that a cutter is often fixed integrally with a knife roller and the cutter covering width cannot be adjusted according to the width of the composite film.

[0005] The composite film die-cutting and forming device of the present invention comprises a base, an auxiliary roller, a pressure roller and a circular knife roller, wherein the auxiliary roller, the pressure roller and the circular knife roller are all arranged in the base, the circular knife roller is provided with a die-cutting portion, and a plurality of die-cutting knife groups are arranged equidistantly along the axial direction of the circular knife roller;

[0006] The plurality of die-cutting knife groups are composed of a die-cutting ring and a die-cutting knife. The die-cutting ring is rotatably assembled in the circular knife roller. The die-cutting knife is arranged on the die-cutting ring, and its end is passed through the die-cutting part and can slide radially in the die-cutting part as the die-cutting ring rotates.

[0007] A locking rod is provided inside the die-cutting ring, which can be inserted into the die-cutting part to lock the die-cutting ring so that it cannot rotate;

[0008] A transmission disc adapted to the die-cutting ring is provided inside the circular knife roller, which can rotate and move axially inside the circular knife roller. After the transmission disc moves into the middle of the die-cutting ring, the locking rod can release the lock on the die-cutting ring and drive the die-cutting ring to rotate.

[0009] Preferably, a circular cavity is provided inside the circular knife roller, an annular seat is provided inside the circular cavity and is located on the side of the die-cutting portion, and the die-cutting ring is coaxially arranged in the annular seat and can rotate relative to the annular seat.

[0010] Preferably, an annular cavity is coaxially opened inside the die-cutting ring, an arc groove is opened on the side wall of the annular cavity, the inner end of the die-cutting knife is arranged in the annular cavity, and a guide shaft is provided on the die-cutting knife, and the end of the guide shaft is slidably assembled in the arc groove.

[0011] Preferably, the transmission disc is coaxially arranged in the circular cavity, a magnet ring is coaxially fixed on the transmission disc, and a magnetic plate is fixedly installed on the inner ring wall of the die-cutting ring, which can stick to and adsorb the magnet ring after the transmission disc moves into the middle of the die-cutting ring. A lead screw is coaxially fixed on the transmission disc, and the lead screw is threadedly connected to the inside of the circular knife roller.

[0012] Preferably, a radial groove is provided on the side wall of the die-cutting ring along its axial direction, and the locking rod is slidably assembled in the radial groove. A locking spring is provided in the radial groove, and the locking spring is fixed to the inner end of the locking rod. Two locking holes adapted to the locking rod are provided inside the die-cutting part, and the two locking holes can be respectively connected to the radial groove when the die-cutting knife is fully extended and fully retracted.

[0013] Preferably, the locking rod and the magnetic plate are both made of magnetic metal, and the magnet ring can adsorb the locking rod to slide in the radial groove.

[0014] Preferably, the base consists of a bottom plate and two vertical plates, a vertical groove is opened inside the vertical plate, the end of the auxiliary roller is rotatably equipped with a support seat, and the support seat is arranged at the bottom end of the vertical groove, and a gear set is arranged between the auxiliary roller and the circular knife roller.

[0015] Preferably, the pressure roller consists of a slide, a roller shaft and a fastener. The slide is slidably assembled inside the vertical groove, the roller shaft is rotatably assembled on the slide, and a clamping ring is provided on the roller shaft. The end of the circular knife roller is provided with a positioning ring that is compatible with the clamping ring. The fastener is provided on the slide and can adjust the height of the slide and the roller shaft.

[0016] Preferably, the fastener includes a support plate and a fastening screw, the support plate is arranged at the top end of the vertical groove, the fastening screw is threadedly connected to the inside of the support plate, and the bottom end of the fastening screw is rotatably assembled on the slide seat.

[0017] The die-cutting method of the composite film of the present invention comprises the following steps:

[0018] Step 1: Turn the lead screw to make the transmission disc rotate and move in the circular cavity;

[0019] Step 2: The transmission disc enters the middle of the die-cutting ring, and the magnet ring drives the locking rod to unlock the die-cutting ring, and drives the die-cutting ring to rotate to retract or extend the die-cutting knife;

[0020] Step 3: Adjust the number of die-cutting knife sets used according to the width of the composite film;

[0021] Step 4: Make the composite film pass through between the auxiliary roller and the circular knife roller, and press the circular knife roller with the pressing roller;

[0022] Step 5: The auxiliary roller drives the circular knife roller to rotate, so that the die-cutting knife group can die-cut the composite film.

[0023] Beneficial effects:

[0024] When the present invention is in use, the transmission disk rotates and passes through the interior of each die-cutting ring in turn, automatically unlocking the locking rod, so that the die-cutting knives in each die-cutting ring are contracted or extended in turn, and the number of die-cutting knife groups used can be adjusted according to the width of the composite film. There is no need to replace the circular knife roller, and it can better adapt to the die-cutting processing of composite films of the same type but different widths, eliminating the trouble of replacing the circular knife roller, effectively reducing equipment costs, and facilitating the die-cutting processing of composite films of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a perspective view of the present invention.

[0026] Figure 2 It is a front view of the present invention.

[0027] Figure 3 It is a front cross-sectional view of the die-cutting portion of the present invention.

[0028] Figure 4 It is a side sectional view of the die-cutting portion of the present invention.

[0029] Figure 5 It is another side sectional view of the die-cutting portion of the present invention.

[0030] Figure 6 It is a three-dimensional diagram of the die-cutting knife assembly of the present invention.

[0031] Reference numerals:

[0032] 10. Base; 11. Bottom plate; 12. Vertical plate; 13. Vertical groove; 20. Auxiliary roller; 21. Support seat; 22. Gear set; 30. Pressure roller; 31. Slide seat; 32. Roller shaft; 321. Pressure ring; 33. Fastener; 331. Support plate; 332. Fastening screw; 40. Circular knife roller; 41. Die-cutting part; 411. Locking hole; 42. Circular cavity; 43. Annular seat; 44. Alignment ring; 50. Die-cutting knife assembly; 51. Die-cutting ring; 511. Annular cavity; 512. Arc groove; 513. Radial groove; 52. Die-cutting knife; 521. Guide shaft; 60. Transmission assembly; 61. Transmission disk; 611. Screw; 62. Magnet ring; 63. Magnetic plate; 70. Locking assembly; 71. Locking rod; 72. Locking spring. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] like Figures 1 to 6 As shown, the die-cutting and forming device of the composite film of the present invention includes a base 10, an auxiliary roller 20, a pressure roller 30, a circular knife roller 40, a die-cutting knife group 50, a transmission assembly 60 and a locking assembly 70. The circular knife roller 40 is arranged between the auxiliary roller 20 and the pressure roller 30, and the pressure roller 30 can press the circular knife roller 40 so that the auxiliary roller 20 drives the circular knife roller 40 to rotate. The die-cutting knife group 50 has multiple equidistantly distributed along the axial direction of the circular knife roller 40, and can die-cut the composite film when the circular knife roller 40 rotates. The locking assembly 70 is arranged in the die-cutting knife group 50 for locking the die-cutting knife group 50. The transmission assembly 60 is arranged inside the circular knife roller 40, and can adjust the multiple die-cutting knife groups 50 to gradually shrink from front to back or gradually extend from back to front, and then adjust the number of die-cutting knife groups 50 involved in die-cutting according to the width of the composite film.

[0035] The base 10 is composed of a bottom plate 11 and two vertical plates 12 , and is U-shaped as a whole. A vertical groove 13 is provided inside the vertical plate 12 for installing the auxiliary roller 20 , the pressure roller 30 and the circular knife roller 40 .

[0036] refer to Figure 1 and Figure 2 The end of the auxiliary roller 20 is rotatably equipped with a support seat 21, and the support seat 21 is arranged at the bottom end of the vertical groove 13. A motor is provided on one side of the support seat 21 for driving the auxiliary roller 20 to rotate. A gear set 22 is provided between the auxiliary roller 20 and the circular knife roller 40 to drive the circular knife roller 40 to rotate, and then perform composite film die-cutting.

[0037] refer to Figure 1 and Figure 2The pressure roller 30 is composed of a slide 31, a roller shaft 32 and a fastener 33. The slide 31 is slidably assembled inside the vertical groove 13, and the roller shaft 32 is rotatably assembled on the slide 31. A clamping ring 321 is provided on the roller shaft 32. The fastener 33 is provided on the slide 31, and the height of the slide 31 and the roller shaft 32 can be adjusted so that the roller shaft 32 presses the circular knife roller 40 to above the auxiliary roller 20 through the clamping ring 321.

[0038] The fastener 33 includes a support plate 331 and a fastening screw 332. The support plate 331 is arranged at the top end of the vertical groove 13. The fastening screw 332 is threadedly connected to the inside of the support plate 331, and the bottom end of the fastening screw 332 is rotatably assembled on the slide 31. A handwheel is provided at the top end of the fastening screw 332. By turning the handwheel, the fastening screw 332 can be rotated and raised inside the support plate 331, thereby driving the slide 31 to slide along the vertical groove 13 to adjust the height of the roller shaft 32.

[0039] refer to Figure 1 and Figure 3 The end side of the circular knife roller 40 is rotatably equipped with a mounting seat, and the mounting seat is slidably assembled in the vertical groove 13 for supporting the circular knife roller 40. A die-cutting portion 41 is provided in the middle of the circular knife roller 40, and a circular cavity 42 is opened inside the circular knife roller 40. The interior of the circular cavity 42 is equidistantly provided with multiple groups of annular seats 43 located on the side of the die-cutting portion 41 along its axial direction for installing the die-cutting knife group 50. The end of the circular knife roller 40 is provided with a positioning ring 44 adapted to the clamping ring 321, which can be aligned with the clamping ring 321 when the roller shaft 32 descends, and then the roller shaft 32 presses the circular knife roller 40.

[0040] refer to Figure 3 、 Figure 4 as well as Figure 6 The die-cutting knife group 50 includes a die-cutting ring 51 and a die-cutting knife 52. The die-cutting ring 51 is coaxially arranged inside the annular seat 43 and can rotate relative to the annular seat 43. The die-cutting knife 52 has multiple annularly evenly distributed die-cutting rings 51. The top end of the die-cutting knife 52 passes through the die-cutting part 41 and can slide radially in the die-cutting part 41 as the die-cutting ring 51 rotates, extending to the outside of the die-cutting part 41 or shrinking to the inside of the die-cutting part 41.

[0041] refer to Figure 4 and Figure 6The die-cutting ring 51 is coaxially provided with an annular cavity 511 inside, and an arc groove 512 is provided on the side wall of the annular cavity 511. The inner end of the die-cutting knife 52 (that is, the end located in the circular cavity 42) is arranged in the annular cavity 511, and a guide shaft 521 is provided on the die-cutting knife 52. The neutral axis of the guide shaft 521 is arranged parallel to the central axis of the die-cutting ring 51, and its end is slidably assembled in the arc groove 512. When the die-cutting ring 51 rotates, the arc groove 512 can drive the die-cutting knife 52 to slide in the die-cutting part 41, so that the die-cutting knife 52 can be retracted and extended in the die-cutting part 41. There are multiple arc grooves 512 uniformly distributed in an annular direction along the circumferential direction of the annular cavity 511, corresponding to the multiple die-cutting knives 52 one by one, so that the die-cutting ring 51 can drive the multiple die-cutting knives 52 to be retracted and extended synchronously when the die-cutting ring 51 rotates.

[0042] refer to Figure 3 and Figure 5 The transmission assembly 60 includes a transmission disc 61, a magnet ring 62 and a magnetic plate 63. The transmission disc 61 is coaxially arranged in the circular cavity 42, and its size is adapted to the die-cutting ring 51. It can rotate inside the circular cavity 42 and move axially, approaching or moving away from the die-cutting ring 51. The magnet ring 62 is coaxially fixed on the transmission disc 61, and the magnetic plate 63 is fixedly installed on the inner ring wall of the die-cutting ring 51. After the transmission disc 61 moves into the middle of the die-cutting ring 51, it can be attached to the magnet ring 62 and adsorbed to each other, so that the die-cutting ring 51 can rotate in the annular seat 43 as the transmission disc 61 rotates.

[0043] refer to Figure 3 and Figure 4, a lead screw 611 is coaxially fixed on the transmission disc 61, and the lead screw 611 is threadedly connected to the inside of the circular cutter roller 40, and the end of the lead screw 611 away from the transmission disc 61 extends to the outside of the circular cutter roller 40, and is rotated out of the circular cutter roller 40 by rotating the lead screw 611, driving the transmission disc 61 to rotate inside the circular cavity 42 and move toward the die-cutting ring 51. When the transmission disc 61 enters the first die-cutting ring 51, the magnet ring 62 and the magnetic plate 63 attract each other, and the transmission disc 61 drives the die-cutting ring 51 to rotate during rotation, causing the guide shaft 521 to slide along the arc groove 512, and the die-cutting knife 52 is received in the interior of the die-cutting portion 41. After the guide shaft 521 moves from the top end of the arc groove 512 to the bottom end and is completely received, because the die-cutting knife 5 2, the die-cutting ring 51 cannot continue to rotate with the transmission disk 61. As the transmission disk 61 continues to move, the magnet ring 62 separates from the magnetic plate 63 in the first die-cutting ring 51, so that the die-cutting knife 52 in the die-cutting ring 51 remains in the storage state, and then as the transmission disk 61 continues to move into the second die-cutting ring 51, the die-cutting knife 52 in the die-cutting ring 51 can be stored, and then it can move with the transmission disk 61 in the circular cavity 42, and multiple die-cutting knife groups 50 can be stored one by one from front to back. Similarly, the transmission disk 61 moves back and resets, and the stored die-cutting knife groups 50 can be sent out one by one from back to front, and then the number of die-cutting knife groups 50 used in die-cutting can be quickly adjusted according to the width of the composite film.

[0044] refer to Figure 3 and Figure 5 The locking assembly 70 includes a locking rod 71 and a locking spring 72. A radial groove 513 is provided on the side wall of the die cutting ring 51 along its axial direction. The locking rod 71 is slidably assembled in the radial groove 513. The locking spring 72 is arranged inside the radial groove 513 and fixed to the inner end of the locking rod 71 (the end close to the central axis of the die cutting ring 51). The locking spring 72 is in a compressed state and always applies a thrust toward the outside of the radial groove 513 to the locking rod 71. The interior of the die cutting portion 41 has two The locking rod 71 is adapted to the locking hole 411. The two locking holes 411 can be connected to the radial groove 513 respectively when the die-cutting knife 52 is fully extended (that is, the guide shaft 521 is located at the end of the arc groove 512 close to the die-cutting part 41) and fully retracted (that is, the guide shaft 521 is located at the end of the arc groove 512 away from the die-cutting part 41). Then, the locking rod 71 can be inserted into the locking hole 411 under the push of the locking spring 72 to position the die-cutting ring 51, so that the die-cutting ring 51 cannot rotate.

[0045] The locking rod 71 and the magnetic plate 63 are both made of magnetic metal, specifically iron, nickel, cobalt and alloys containing iron, nickel, cobalt, etc., so that the locking rod 71 can be adsorbed with the magnet ring 62. After the magnet ring 62 enters the middle of the die-cutting ring 51, the locking rod 71 can be separated from the locking hole 411 under the adsorption of the magnet ring 62, completely enter the radial groove 513 and compress the locking spring 72, and then release the lock on the die-cutting ring 51, so that the die-cutting ring 51 can rotate with the transmission disk 61, and after the transmission disk 61 is separated from the die-cutting ring 51, the locking rod 71 is automatically inserted into another locking hole 411 under the push of the locking spring 72 to lock the die-cutting ring 51 again.

[0046] The die-cutting method of the composite film of the present invention comprises the following steps:

[0047] Step 1: Rotate the lead screw 611 to make the transmission plate 61 rotate and move in the circular cavity 42 .

[0048] Step 2: The transmission disk 61 enters the middle of the die-cutting ring 51, and the locking rod 71 is attracted by the magnet ring 62 to disengage from the lock hole 411, thereby releasing the lock on the die-cutting ring 51. Then, the magnet ring 62 attracts the magnetic plate 63, causing the transmission disk 61 to drive the die-cutting ring 51 to rotate, driving the guide shaft 521 to move along the arc groove 512, causing the die-cutting knife 52 to slide in the die-cutting portion 41, causing the die-cutting knife 52 to retract or extend.

[0049] Step 3: The transmission plate 61 is moved to drive the die-cutting blade groups 50 to retract or extend one by one from front to back or from back to front, and the number of die-cutting blade groups 50 used is adjusted according to the width of the composite film.

[0050] Step 4: Make the composite film pass between the auxiliary roller 20 and the circular knife roller 40 , rotate the fastening screw 332 to lower the slide 31 , and press the circular knife roller 40 with the roller shaft 32 .

[0051] Step 5: The auxiliary roller 20 drives the circular knife roller 40 to rotate through the gear set 22, so that the die-cutting knife set 50 performs die-cutting on the composite film.

[0052] In the present invention, the transmission disk 61 rotates and passes through the interior of each die-cutting ring 51 in turn, automatically unlocking the locking rod 71, so that the die-cutting knife 52 in each die-cutting ring 51 is contracted or extended in turn. The number of die-cutting knife groups 50 used can be adjusted according to the width of the composite film, and there is no need to replace the circular knife roller 40. It can better adapt to the die-cutting processing of composite films of the same type but different widths, eliminating the trouble of replacing the circular knife roller 40, effectively reducing equipment costs, and facilitating the die-cutting processing of composite films of different widths.

[0053] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A composite film die-cutting and forming device, comprising a base (10), an auxiliary roller (20), a pressure roller (30) and a circular knife roller (40), wherein the auxiliary roller (20), the pressure roller (30) and the circular knife roller (40) are all arranged in the base (10), and is characterized in that: A die-cutting portion (41) is provided on the circular knife roller (40), and a plurality of die-cutting knife groups (50) are provided at equal intervals inside the circular knife roller (40) along its axial direction; The plurality of die-cutting knife groups (50) are each composed of a die-cutting ring (51) and a die-cutting knife (52), wherein the die-cutting ring (51) is rotatably assembled in the circular knife roller (40), and the die-cutting knife (52) is arranged on the die-cutting ring (51), and its end portion passes through the die-cutting portion (41) and can radially slide in the die-cutting portion (41) as the die-cutting ring (51) rotates; A locking rod (71) is provided inside the die-cutting ring (51) and can be inserted into the die-cutting portion (41) to lock the die-cutting ring (51) so that it cannot rotate; A transmission disc (61) adapted to the die-cutting ring (51) is provided inside the circular knife roller (40), and can rotate and move axially inside the circular knife roller (40). After the transmission disc (61) moves into the middle of the die-cutting ring (51), the locking rod (71) can release the lock on the die-cutting ring (51) and drive the die-cutting ring (51) to rotate. A circular cavity (42) is provided inside the circular knife roller (40), an annular seat (43) is provided inside the circular cavity (42) and is located on the side of the die-cutting portion (41), and a die-cutting ring (51) is coaxially arranged in the annular seat (43) and is capable of rotating relative to the annular seat (43); An annular cavity (511) is coaxially formed inside the die-cutting ring (51), an arc-shaped groove (512) is formed on the side wall of the annular cavity (511), the inner end of the die-cutting knife (52) is arranged in the annular cavity (511), and a guide shaft (521) is provided on the die-cutting knife (52), and the end of the guide shaft (521) is slidably assembled in the arc-shaped groove (512); The transmission disc (61) is coaxially arranged in the circular cavity (42), a magnet ring (62) is coaxially fixed on the transmission disc (61), and a magnetic plate (63) is fixedly installed on the inner ring wall of the die-cutting ring (51), which can be attached to and attracted to the magnet ring (62) after the transmission disc (61) moves into the middle of the die-cutting ring (51), and a lead screw (611) is coaxially fixed on the transmission disc (61), and the lead screw (611) is threadedly connected to the inside of the circular knife roller (40); A radial groove (513) is provided on the side wall of the die-cutting ring (51) along its axial direction. The locking rod (71) is slidably assembled in the radial groove (513). A locking spring (72) is provided in the radial groove (513), and the locking spring (72) is fixed to the inner end of the locking rod (71). Two locking holes (411) adapted to the locking rod (71) are provided inside the die-cutting portion (41), and the two locking holes (411) can be respectively connected to the radial groove (513) when the die-cutting knife (52) is fully extended or fully retracted.

2. The die-cutting and forming device of the composite film according to claim 1, characterized in that: The locking rod (71) and the magnetic plate (63) are both made of magnetic metal, and the magnet ring (62) can adsorb the locking rod (71) to slide in the radial groove (513).

3. The die-cutting and forming device of the composite film according to claim 2, characterized in that: The base (10) is composed of a bottom plate (11) and two vertical plates (12). A vertical groove (13) is provided inside the vertical plate (12). The end of the auxiliary roller (20) is rotatably equipped with a support seat (21), and the support seat (21) is arranged at the bottom end of the vertical groove (13). A gear set (22) is provided between the auxiliary roller (20) and the circular knife roller (40).

4. The die-cutting and forming device of the composite film according to claim 3, characterized in that: The pressure roller (30) is composed of a slide (31), a roller shaft (32) and a fastener (33). The slide (31) is slidably assembled inside the vertical groove (13). The roller shaft (32) is rotatably assembled on the slide (31). A clamping ring (321) is provided on the roller shaft (32). An alignment ring (44) adapted to the clamping ring (321) is provided at the end of the circular knife roller (40). The fastener (33) is provided on the slide (31) and can adjust the height of the slide (31) and the roller shaft (32).

5. The die-cutting and forming device of the composite film according to claim 4, characterized in that: The fastener (33) includes a support plate (331) and a fastening screw (332), wherein the support plate (331) is arranged at the top end of the vertical slot (13), the fastening screw (332) is threadedly connected to the inside of the support plate (331), and the bottom end of the fastening screw (332) is rotatably assembled on the slide seat (31).

6. A composite film die-cutting method, suitable for the composite film die-cutting device according to claim 5, characterized in that: The following steps are involved: Step 1: Rotate the lead screw (611) to rotate and move the transmission disc (61) in the circular cavity (42); Step 2: The transmission disc (61) enters the middle of the die-cutting ring (51), and the magnet ring (62) drives the locking rod (71) to unlock the die-cutting ring (51), and drives the die-cutting ring (51) to rotate so that the die-cutting knife (52) retracts or extends; Step 3: adjusting the number of die-cutting knife sets (50) used according to the width of the composite film; Step 4: The composite film is passed between the auxiliary roller (20) and the circular knife roller (40), and the circular knife roller (40) is pressed by the pressing roller (30); Step 5: The auxiliary roller (20) drives the circular knife roller (40) to rotate, so that the die-cutting knife group (50) performs die-cutting on the composite film.

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