Die cutting machine

Abstract

The present invention provides a film cutting machine, which includes a base, a pressure wheel, a motor, and a cutting part. The cutting part is fixed on the motor. The cutting part includes knife needles, and further includes a knife needle height detection device. The knife needle height detection device is installed inside the film cutting machine and faces the knife needles in the reset state. The knife needles include an effective cutting part and a knife body. The reflective intensity of the surface of the effective cutting part is greater than that of the surface of the knife body. Compared with the prior art, the present invention solves the problem of measuring the height of the knife needles by setting the knife needle height detection device and setting the difference in reflective intensity between the effective cutting part and the knife body, making the film cutting process more controllable by using the difference in reflective intensity.

Description

Technical Field

[0001] The present invention relates to the technical field of processing equipment for protective films of electronic devices, and more specifically, to a film cutting machine. Background Art

[0002] A film cutting machine, also called a membrane cutting machine, is often used to cut the front and rear panel protective films of mobile phones and tablet computers. Different from traditional die cutting which requires customizing a die according to the pattern and is time-consuming and laborious in small-batch and multi-variety personalized die cutting, the film cutting machine solves the above application problems and is the best choice for small-batch and multi-variety die cutting. The film cutting machine drives a cutting knife with a motor and can trim the edges of the protective film of the electronic device, cutting the mobile phone film into a standard shape and width. Figure 1 FIG. is a schematic diagram of a prior art film cutting machine. When using the prior art film cutting machine 1 for film cutting, first manually select the type of film to be cut on the operation panel 13 of the film cutting machine 1, then manually take a film and place it on the bottom plate 11 of the film cutting machine. The film is pressed on the bottom plate 11 of the film cutting machine by the pressing wheel 12, and the film cutting machine 1 is manually started. The pressing wheel 12 of the film cutting machine 1 rotates to move the position of the film, and at the same time, the cutting part 14 cuts the film. Through the motor 15 driving the lateral movement of the cutting part 14 and the pressing wheel 12 driving the longitudinal movement of the film, a preset planar pattern is cut on the film. The cutting part 14 includes a needle for cutting. In the prior art film cutting machine 1, the cutting height of the needle cannot be measured in real time when cutting. When the needle is a newly replaced part, the cutting height of the needle can be determined by parameters such as the length of the needle. Generally, the cutting height of the needle is adjusted to a suitable value by manual adjustment. However, for a needle that has been working for a period of time and has been partially worn, since the worn value cannot be accurately measured, the cutting height of the needle cannot be determined. Usually, after the needle cannot cut through the film, a new needle is directly replaced, resulting in a large amount of waste. In addition, manually adjusting the cutting height of the needle requires stopping the machine, removing the needle, adjusting the height, manually installing the needle, and debugging, and the process is relatively cumbersome, causing inconvenience to the use of the film cutting machine 1. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a film cutting machine that can measure the cutting height of the needle in real time in view of the defect that the prior art film cutting machine cannot determine the cutting height of the needle in real time.

[0004] The present invention provides a film cutting machine, including a base, a pressing wheel, a motor, and a cutting part. The cutting part is fixed on the motor, and the cutting part includes a needle.

[0005] It further includes a needle height detection device, which is installed inside the film cutting machine and is directly opposite to the needle in the reset state.

[0006] The cutting needle includes an effective cutting part and a needle body, and the reflective intensity of the surface of the effective cutting part is greater than that of the surface of the needle body.

[0007] Preferably, the cutting needle height detection device includes a laser sensor.

[0008] Preferably, the film cutting machine includes a cutting needle groove, which is arranged opposite to the cutting needle. When the cutting needle is in the reset state, it is received in the cutting needle groove, and the outer shell of the motor covers the opening part of the cutting needle groove.

[0009] Preferably, the cutting needle height detection device emits laser, and the laser irradiates on the cutting needle and is reflected.

[0010] The sensor receiver of the cutting needle height detection device generates corresponding different electrical signals according to the strength of the received reflected light.

[0011] The cutting needle height detection device transmits the generated electrical signals to the control system of the film cutting machine.

[0012] The control system of the film cutting machine judges the height of the cutting needle according to the difference of the electrical signals.

[0013] Preferably, the film cutting machine includes a height adjustment device, which is arranged inside the cutting part. The height adjustment device includes a cam, a limit hole, a second spring connection ring, and a substrate. The cam, the limit hole, and the second spring connection ring are arranged on the substrate. The height adjustment device further includes a first positioning device, a first spring connection ring, a guide rod, and a second positioning device. The first positioning device and the first spring connection ring are fixed on the guide rod and can move along with the movement of the guide rod. The guide rod passes through the limit hole and the second spring connection ring. One end of the guide rod abuts against the cam. The first spring connection ring is fixed on the guide rod. A power spring is arranged between the first spring connection ring and the second spring connection ring. A positioning chute is arranged on the second positioning device, and the first positioning device abuts against the positioning chute.

[0014] Preferably, the first positioning device further includes a positioning spring, a pin shaft, and a pin shaft chute. One end of the positioning spring is fixed on the first positioning device, and the other end is connected to the pin shaft. The pin shaft is arranged in the chute defined by the pin shaft chute and can move in the direction of the chute.

[0015] Preferably, the positioning chute includes a plurality of rotating segments and a plurality of positioning segments. The rotating segments and the positioning segments are connected end to end respectively to form a closed curve. The rotating segments are smooth curves, and the depth of the chute gradually decreases from top to bottom. The positioning segments are vertical straight lines. The intersection of the upper end of the positioning segment and the rotating segment is a positioning point. The heights of adjacent positioning points decrease in sequence. After one full rotation, the positioning point with the lowest height is connected to the positioning point with the highest height through one rotating segment and one positioning segment.

[0016] Preferably, the die-cutting machine for the needle fixing device further includes a locking mechanism for clamping the second positioning device, and one end of the locking mechanism is fixed on the die-cutting machine.

[0017] Preferably, the needle height detection device detects the height of the needle.

[0018] When the needle height detection device detects that the height of the needle is less than or greater than the set height, the control system of the die-cutting machine issues a command to adjust the height. The height adjustment device adjusts the height of the needle so that the height of the needle conforms to the set height.

[0019] The needle height detection device re-detects. If the height of the needle is within the set height range, the next cutting can be continued.

[0020] Preferably, when the needle height detection device detects that the length of the effective cutting part is too short to complete the next cutting, it feeds back this information to the control system, and the control system sends a message to remind the user to replace the needle.

[0021] Compared with the prior art, by setting the needle height detection device and setting the difference in the reflection intensity between the effective cutting part and the blade body, the present invention solves the problem of measuring the needle height by using the different reflection intensities, making the film cutting process more controllable. Through the setting of the height adjustment device, the automatic adjustment of the needle height is realized. Through the setting of the positioning spring, the pin shaft, and the pin shaft spring in the first positioning device, the sliding of the first positioning device on the positioning chute is made more smooth. The stepped positioning chute can realize the step-by-step adjustment of the needle height. The setting of the locking mechanism can prevent the needle from shaking during film cutting. The height adjustment device cooperates with the method of automatically detecting the needle height, and can automatically adjust when the needle height does not meet the set height, making the film cutting process more convenient and intelligent, and eliminating the cumbersome manual inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the drawings and embodiments. As shown in the figures:

[0023] In the prior art: 1 - film cutting machine; 11 - base; 12 - pressure wheel; 13 - operation panel; 14 - cutting part; 15 - motor;

[0024] In the present invention: 2 - film cutting machine; 21 - base; 22 - pressure wheel; 23 - operation panel; 24 - cutting part; 241 - knife needle; 2411 - knife body; 2412 - effective cutting part; 25 - motor; 26 - knife needle height detection device; 28 - side plate; 29 - knife needle groove;

[0025] 10 - height adjustment device; 101 - cam; 102 - first positioning device; 103 - substrate; 104 - first spring connection ring; 105 - power spring; 106 - guide rod; 107 - second spring connection ring; 108 - limit hole; 201 - positioning spring; 202 - pin shaft; 203 - pin shaft chute; 301 - second positioning device; 302 - positioning chute; 3021 - rotating section; 3022 - positioning section; 3023 - positioning point; 303 - knife needle fixing device; locking mechanism 401;

[0026] Figure 1 It is a schematic structural diagram of a film cutting machine in the prior art;

[0027] Figure 2 It is a schematic structural diagram of the film cutting machine according to the first embodiment of the present invention;

[0028] Figure 3 It is a schematic external structural diagram of the cutting part of the film cutting machine according to the present invention;

[0029] Figure 4 It is a schematic diagram of the principle of the knife needle height detection device of the film cutting machine according to the present invention for detecting the height of the knife needle;

[0030] Figure 5 It is a schematic structural diagram of the knife needle of the film cutting machine according to the present invention;

[0031] Figure 6 It is a schematic internal structure diagram of the cutting part of the film cutting machine according to the present invention Figure 1 ;

[0032] Figure 7 It is a schematic internal structure diagram of the cutting part of the film cutting machine according to the present invention Figure 2 ;

[0033] Figure 8 It is a schematic structural diagram of the second embodiment of the film cutting machine according to the present invention Figure 1 ;

[0034] Figure 9 It is a schematic structural diagram of the second embodiment of the film cutting machine according to the present invention Figure 2 . Detailed implementation manners

[0035] To solve the defects of the prior art, such as the inability to determine the cutting height of the knife needle in real time, waste of knife needles, and the complexity of manually adjusting the height of the knife needle, a die-cutting machine is provided that can measure the cutting height of the knife needle in real time, improve the utilization rate of the knife needle, and automatically adjust the height of the knife needle.

[0036] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Typical embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal" and similar expressions used herein are for illustrative purposes only.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] The ordinal terms such as "first", "second", etc. used in this specification can be used to describe various components, but these components are not limited by these terms. The purpose of using these terms is only to distinguish one component from other components. For example, without departing from the scope of the rights of the present invention, the first component can be named the second component, and similarly, the second component can also be named the first component. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] Please refer to Figure 2, the film cutting machine 2 of the present invention includes a base 21, a pressure wheel 22, a motor 25, and a cutting part 24. The cutting part 24 is fixed on the motor 25. The pressure wheel 22 can press the film on the base 21 and drive the film to move along the Y-axis direction shown in the figure on the base 21 by rolling. The motor 25 drives the cutting part 24 to move in the X-axis direction shown in the figure, so as to cut out a planar graph on the film. When in use, by clicking on the operation panel 23, an operation instruction can be sent to the film cutting machine 2. The film cutting machine 2 is internally provided with a control system, and the control system will cut out the corresponding graph according to the content of the instruction. The film cutting machine 2 includes a knife needle height detection device 26. The knife needle height detection device 26 is installed inside the film cutting machine 2, facing the position of the knife needle 241 in the reset state. The knife needle height detection device 26 can be used to detect the length of the knife needle of the cutting part 24, so as to determine the current cutting height. In the present invention, the knife needle height detection device 26 is preferably a laser sensor.

[0041] Please refer to Figures 3 - 5 , the cutting part 24 includes a knife needle 241. The knife needle 241 is fixed at one end of the cutting part 24. The knife needle 241 includes a knife body 2411 for fixing the knife needle 241 and an effective cutting part 2412 for cutting. The effective cutting part 2412 can be used to cut the film. After the effective cutting part 2412 is worn after long-term use, the remaining effective cutting part 2412 can still cut a part of the film with a thickness less than the length of the effective cutting part 2412. When the entire effective cutting part 2412 is worn out or the length of the effective cutting part 2412 is less than the thickness of the film, the knife needle 241 can no longer cut, and the knife needle 241 needs to be replaced. In the present invention, materials or coatings with different light reflection properties are respectively provided on the outer surfaces of the knife body 2411 and the effective cutting part 2412, so that the light reflection intensity of the effective cutting part 2412 is greater than that of the knife body 2411. For example, an absorbent coating is applied to the knife body 2411, and a reflective coating is applied to the effective cutting part 2412; or the entire knife needle 241 is made of a metal with strong light reflection performance, and an absorbent coating is applied to the knife body 2411; or the entire knife needle 241 is made of a metal with poor light reflection performance, and a reflective coating is applied to the effective cutting part 2412; or the effective cutting part 2412 with good light reflection performance and the knife body 2411 with poor light reflection performance are respectively manufactured, and then the effective cutting part 2412 and the knife body 2411 are combined into the knife needle 241.

[0042] When performing the height detection of the knife needle, the knife needle height detection device 26 emits a laser. After being reflected by the knife needle 241, the laser scatters in all directions. Part of the scattered light returns to the sensor receiver of the knife needle height detection device 26. The receiver generates corresponding different electrical signals according to the intensity of the received light and transmits the electrical signals to the control system of the film cutting machine 2. The control system of the film cutting machine 2 judges the height of the knife needle 241 according to the difference of the electrical signals. Since the effective cutting part 2412 of the knife needle 241 has strong light reflection ability, the wear of the effective cutting part 2412 will cause huge changes in the optical signal and the electrical signal. The remaining length of the effective cutting part 2412 corresponds to specific optical signals and electrical signals. The control system of the film cutting machine 2 can know the remaining length of the effective cutting part 2412 according to the received electrical signal.

[0043] Please refer to Figures 6 - 7 , Figures 6 - 7 which shows the internal structure of the cutting part 24. The cutting part 24 includes a height adjustment device 10, and the height adjustment device 10 is arranged inside the cutting part 24. The height adjustment device 10 includes a cam 101, a limit hole 108, a second spring connection ring 107, a substrate 103, and a second positioning device 301. The cam 101, the limit hole 108, and the second spring connection ring 107 are arranged on the substrate 103. Among them, the cam 101 is movably connected to the substrate 103 through the shaft of a cam motor (not shown in the figure), and the limit hole 108 and the second spring connection ring 107 are fixed on the substrate 103. The height adjustment device 10 further includes a first positioning device 102, a first spring connection ring 104, a power spring 105, and a guide rod 106. The first positioning device 102 and the first spring connection ring 104 are fixed on the guide rod 106 and can move along with the movement of the guide rod 106. The guide rod 106 passes through the limit hole 108 and the second spring connection ring 107 and can only reciprocate along a single straight line direction under the limitation of the limit hole 108 and the second spring connection ring 107. One end of the guide rod 106 abuts against the cam 101 and moves under the action of the cam 101. The first spring connection ring 104 is fixed on the guide rod 106, and a power spring 105 is arranged between the first spring connection ring 104 and the second spring connection ring 107. When the cam 101 is in the pushing process, the guide rod 106 moves downward, and the first spring connection ring 104 presses on the power spring 105, and the power spring 105 is compressed. When the cam 101 is in the return process, the power spring 105 releases pressure and pushes the first spring connection ring 104 upward, thereby driving the guide rod 106 and the first positioning device 102 upward, and so on.

[0044] The first positioning device 102 further includes a positioning spring 201, a pin shaft 202, and a pin shaft chute 203. One end of the positioning spring 201 is fixed to the first positioning device 102, and the other end is connected to the pin shaft 202. The pin shaft 202 is arranged in the chute defined by the pin shaft chute 203 and can move in the direction of the chute. The second positioning device 301 is provided with a positioning chute 302. One end of the pin shaft 202 is connected to the positioning spring 201, and the other end abuts against the positioning chute 302. The positioning chute 302 is divided into a plurality of rotating segments 3021 and a plurality of positioning segments 3022. The rotating segments 3021 and the positioning segments 3022 are connected end to end respectively to form a closed curve. The rotating segment 3021 is a smooth curve, and the depth of the chute gradually decreases from top to bottom. The positioning segment 3022 is a vertical straight line. The intersection point of the upper end of the positioning segment 3022 and the rotating segment 3021 is the positioning point 3023. The depth of the chute at the positioning point 3023 is relatively large, and the depths of other parts of the positioning segment 3022 are the same and smaller than the depth of the positioning point 3023. Starting from the positioning point 3023 with the highest height, the heights of adjacent positioning points 3023 decrease in sequence. After rotating one circle, the positioning point 3023 with the lowest height is connected to the positioning point 3023 with the highest height through a rotating segment 3021 and a longer positioning segment 3022. When the cam 101 enters the lift stroke process, due to the large drop between the depth of the positioning point 3023 and the positioning segment 3022, and the relatively smooth transition between the depth of the positioning point 3023 and the depth of the rotating segment 3021, when the pin shaft 202 moves downward, it will abut against the rotating segment 3021 and move downward along the rotating segment 3021. The second positioning device 301 rotates under the action of the pin shaft 202. When the cam 202 changes from the lift stroke to the return stroke, the pin shaft 202 just reaches the bottom of the rotating segment 3021 when abutting against the rotating segment 3021. As the cam 202 enters the return stroke, the guide rod 106 drives the first positioning device 102 to rise. The pin shaft 202 abuts against the next positioning segment 3022 and rises accordingly. When the guide rod 106 rises to the highest point, the pin shaft 202 abuts and engages with the next positioning point 3023. The height adjustment device 10 completes the adjustment of one level of height. To facilitate the second positioning device 301 to slide back smoothly when the pin shaft 202 moves to the positioning segment 3022, the second positioning device 301 can also be used in cooperation with a reset device such as a spring.

[0045] One end of the knife needle fixing device 303 is fixed in the second positioning device 301, and the other end is detachably connected to the knife needle 241. When the knife needle 241 needs to be replaced, the knife needle 241 can be manually removed from the knife needle fixing device 303 and a new knife needle 241 can be replaced. The die cutting machine 2 further includes a locking mechanism 401 for assisting in fixing the second positioning device 301. One end of the locking mechanism 401 is fixed to the die cutting machine 2. When the height of the second positioning device 301 needs to be fixed, the locking mechanism 401 can clamp the second positioning device 301 to fix the height of the knife needle 241.

[0046] The process of the height adjustment device 10 adjusting the height of the cutter needle 241 is as follows: When the height adjustment device 10 is in the initial state, the guide rod 106 is at the highest point, and the pin shaft 22 abuts against one of the positioning points 3023. When the height adjustment device 10 receives an instruction to adjust the height, the control system determines which positioning point 3023 the pin shaft 202 needs to be adjusted to according to the recorded height of the cutter needle 241, and commands the cam motor to rotate the corresponding number of turns according to the calculation result. The cam motor rotates, driving the cam 101 to rotate. The cam 101 acts on the guide rod 106, and the guide rod 106 drives the first positioning device 102 and the pin shaft 202 to move up and down. The movement of the pin shaft 202 abutting against the positioning chute 302 finally makes the pin shaft 202 abut against the corresponding positioning point 3023. The locking mechanism 401 locks the second positioning device 301, and the height adjustment of the cutter needle 241 is completed.

[0047] When using the film cutting machine 2, after the film cutting is completed, the motor 25 resets, and the cutter needle height detection device 26 detects the height of the cutter needle 241. If it is detected that the height of the cutter needle 241 is less than or greater than the set height, the control system issues a command to adjust the height, and the height adjustment device 10 adjusts the height of the cutter needle 241 so that the height of the cutter needle 241 conforms to the set height. The cutter needle height detection device 26 detects again. If the height of the cutter needle 241 is within the set height range, the next cutting can be continued. If the cutter needle height detection device 26 detects that the length of the effective cutting part 2412 is too short to complete the next cutting, it feeds back this information to the control system, and the control system sends a message to remind the user to replace the cutter needle 241.

[0048] Please refer to Figures 8 - 9 , the second embodiment of the present invention provides a film cutting machine 2. Compared with the first embodiment, the film cutting machine 2 of the second embodiment is provided with a cutter needle groove 29, and the cutter needle groove 29 is arranged at a position on the side plate 28 of the film cutting machine 2 opposite to the cutter needle 241. The cutter needle height detection device 26 of the film cutting machine 2 of the second embodiment is arranged inside the cutter needle groove 29. When the film cutting machine 2 finishes cutting and the motor 25 resets, the cutter needle 241 can be received in the cutter needle groove 29. When the cutter needle 241 is in the reset state, the cutter needle 241 is received in the cutter needle groove 29, and the housing of the motor 25 blocks the opening part of the cutter needle groove 29. Such a design can enable the cutter needle height detection device 26 to detect the cutter needle 241 under a condition not interfered by external light, prevent the external light from affecting the cutter needle height detection device 26, and thus can detect the height of the cutter needle 241 more accurately.

[0049] Compared with the prior art, the present invention solves the problem of measuring the height of the cutting needle 241 by setting the cutting needle height detection device 26 and setting the difference in the reflection intensity between the effective cutting part 2412 and the blade body 2111, and makes the film cutting process more controllable by using the different reflection intensities. The automatic adjustment of the height of the cutting needle 241 is realized by setting the height adjustment device 10. By setting the positioning spring 201, the pin shaft 202, and the pin shaft spring 203 in the first positioning device 102, the sliding of the first positioning device 102 on the positioning chute 302 becomes more smooth. The stepped positioning chute 302 can realize the step-by-step adjustment of the height of the cutting needle 241. The setting of the locking mechanism 401 can prevent the cutting needle 241 from shaking during film cutting. The height adjustment device 10 in cooperation with the method of automatically detecting the height of the cutting needle 241 can automatically adjust when the height of the cutting needle 241 does not meet the set height, making the film cutting process more convenient and intelligent, and eliminating the tedious manual inspection.

[0050] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these fall within the protection scope of the present invention.

Claims

1. A die-cutting machine, comprising a base, a pressure wheel, a motor, and a cutting part, wherein the cutting part is fixed on the motor, and the cutting part includes cutter needles, and is characterized in that, it further includes a cutter needle height detection device, the cutter needle height detection device is installed inside the die-cutting machine, and is directly opposite to the cutter needle in the reset state, the cutter needle includes an effective cutting part and a cutter body, and the reflection intensity of the surface of the effective cutting part is greater than that of the surface of the cutter body, the cutter needle height detection device includes a laser sensor, the die-cutting machine includes a cutter needle groove, the cutter needle groove is arranged at a position directly opposite to the cutter needle, and the cutter needle is received in the cutter needle groove when in the reset state, and the outer shell of the motor blocks the opening part of the cutter needle groove, the cutter needle height detection device emits laser, and the laser irradiates on the cutter needle and is reflected, the sensor receiver of the cutter needle height detection device generates corresponding different electrical signals according to the strength of the received reflected light, the cutter needle height detection device transmits the generated electrical signal to the control system of the die-cutting machine, the control system of the die-cutting machine judges the height of the cutter needle according to the difference of the electrical signal, the die-cutting machine includes a height adjustment device, the height adjustment device is arranged inside the cutting part, the height adjustment device includes a cam, a limit hole, a second spring connection ring, and a substrate, the cam, the limit hole, and the second spring connection ring are arranged on the substrate, the height adjustment device further includes a first positioning device, a first spring connection ring, a guide rod, and a second positioning device, the first positioning device and the first spring connection ring are fixed on the guide rod and can move along with the movement of the guide rod, the guide rod passes through the limit hole and the second spring connection ring, one end of the guide rod abuts against the cam, the first spring connection ring is fixed on the guide rod, a power spring is arranged between the first spring connection ring and the second spring connection ring, and a positioning chute is arranged on the second positioning device, and the first positioning device abuts against the positioning chute.

2. The die cutting machine according to claim 1, wherein, The first positioning device further includes a positioning spring, a pin shaft, and a pin shaft chute, one end of the positioning spring is fixed on the first positioning device, and the other end is connected to the pin shaft, the pin shaft is arranged in the chute defined by the pin shaft chute and can move in the direction of the chute.

3. The die-cutting machine according to claim 1, characterized in that, The positioning chute includes a plurality of rotating sections and a plurality of positioning sections, the rotating sections and the positioning sections are respectively connected end to end to form a closed curve, the rotating section is a smooth curve, and the depth of the chute gradually decreases from top to bottom, the positioning section is a vertical straight line, the intersection point of the upper end of the positioning section and the rotating section is a positioning point, the heights of adjacent positioning points decrease in turn, and after rotating one circle, the positioning point with the lowest height is connected to the positioning point with the highest height through one rotating section and one positioning section.

4. The die cutting machine according to claim 3, wherein, The die-cutting machine further includes a locking mechanism for clamping the second positioning device, and one end of the locking mechanism is fixed on the die-cutting machine.

5. The die-cutting machine according to claim 1, characterized in that, The knife needle height detection device detects the height of the knife needle. When the knife needle height detection device detects that the height of the knife needle is less than or greater than the set height, the control system of the film cutting machine issues a command to adjust the height, and the height adjustment device adjusts the height of the knife needle so that the height of the knife needle conforms to the set height. The knife needle height detection device re-detects. If the height of the knife needle is within the set height range, the next cutting can continue.

6. The film cutting machine according to claim 5, wherein When the knife needle height detection device detects that the length of the effective cutting part is too short to complete the next cutting, it feeds back this information to the control system, and the control system sends a message to remind the user to replace the knife needle.

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