Automatic cutter changing device for film cutting

Abstract

This utility model discloses an automatic blade changer for film cutting, relating to the technical field of film production equipment. The automatic blade changer includes a slide rail and multiple blade sets. The slide rail is positioned above the cutting station on the film conveying path. Multiple blade sets are spaced apart on the slide rail. Each blade set includes a base, a multi-axis motion controller, a drive mechanism, and multiple lifting mechanisms. The base slides along the slide rail. Multiple lifting mechanisms are mounted on the base, and each lifting mechanism is detachably equipped with a cutting blade and drives the cutting blade to move up and down. The drive mechanism is mounted on the base and drives the base to reciprocate along the slide rail. The multi-axis motion controller sends independent motion control commands to the drive mechanism and each lifting mechanism. This automatic blade changer for film cutting meets the requirements of high-speed automated, uninterrupted continuous production lines.

Description

Technical Field

[0001] This utility model relates to the field of film production equipment technology, and in particular to an automatic blade changing device for film cutting. Background Technology

[0002] Film cutting machines are mainly used to precisely cut, slit, and slice rolls or sheets of plastic film, protective film, release film, packaging film, etc., according to size. They are the core equipment for the post-processing of film.

[0003] Current film cutting machines use a fixed cutting blade holder as their core structure, along with servo feeding, tension control, and a frame base to form the cutting unit. This is the mainstream configuration for film slitting and cross-cutting processes. Existing cutting blades generally use single-blade independent blades, mostly made of high-speed steel or ordinary hard alloy, fixed to the blade holder body by bolts and positioning blocks. The blade cuts the film by high-speed extrusion and shearing at the cutting edge. However, under continuous high-speed operation, the blade repeatedly rubs and impacts the film, easily causing wear, dulling, and micro-chipping at the cutting edge. This leads to defects such as burrs, streaks, film dragging, and indentations at the cut edge, reducing cutting dimensional accuracy and product yield. Furthermore, since the blade holder only accommodates one cutting blade, when the blade wears down to the point of not meeting production requirements, the machine must be stopped, the clamping bolts removed using tools, the old blade removed, a new blade installed, and the position recalibrated. This entire replacement process is cumbersome, time-consuming, and repeated disassembly and reassembly can affect the positioning accuracy of the blade holder.

[0004] In summary, existing film cutting machines rely on manual intervention and stop-to-change blade operation, disrupting production continuity, increasing labor intensity and equipment downtime wear, and are ill-suited for the requirements of high-speed, automated, and uninterrupted continuous production lines. Therefore, there is an urgent need to design an automatic blade changing device for film cutting to address these technical shortcomings. Utility Model Content

[0005] The purpose of this invention is to provide an automatic blade changing device for film cutting, which can automatically change the cutting blade to meet the requirements of high-speed automated and uninterrupted continuous production lines.

[0006] To achieve the above objectives, this utility model proposes an automatic blade changing device for film cutting, wherein the automatic blade changing device for film cutting includes: The slide rail is installed above the cutting station on the film conveying path; Multiple cutter sets are spaced apart on the slide rail. Each cutter set includes a base, a multi-axis motion controller, a drive mechanism, and multiple lifting mechanisms. The base is slidably engaged with the slide rail. The multiple lifting mechanisms are mounted on the base, and each lifting mechanism is detachably mounted with a cutting blade and drives the cutting blade to move up and down. The drive mechanism is mounted on the base and drives the base to reciprocate along the slide rail. The multi-axis motion controller is electrically or communicatively connected to the drive mechanism and each lifting mechanism, and sends independent motion control commands to the drive mechanism and each lifting mechanism.

[0007] As described above, in the automatic blade changing device for film cutting, the slide rail includes a linear guide rail and a rack arranged in parallel intervals, and the driving mechanism includes a servo motor and a gear. The gear is mounted on the output shaft of the servo motor and meshes with the rack. The servo motor drives the gear to rotate, and through the meshing transmission between the gear and the rack, the base is driven to slide back and forth along the linear guide rail.

[0008] In the automatic blade changing device for film cutting described above, the linear guide is a roller linear guide.

[0009] In the automatic blade changing device for film cutting described above, each of the servo motors is electrically or communicatively connected to the multi-axis motion controller. The multi-axis motion controller independently issues position commands to each of the servo motors to control the start, stop, and rotation of each servo motor.

[0010] The automatic blade changer for film cutting as described above further includes a grating ruler, which is arranged parallel to the linear guide rail. The grating ruler is used to detect the actual displacement of the base in real time and feed it back to the multi-axis motion controller. The multi-axis motion controller corrects the control commands issued to the servo motor based on the feedback signal from the grating ruler.

[0011] In the automatic blade changing device for thin film cutting described above, the resolution range of the grating ruler is 0.1μm~1μm.

[0012] The automatic blade changer for film cutting as described above further includes a control unit. The control unit is electrically or communicatively connected to the plurality of multi-axis motion controllers. The control unit is used to issue a general task command to each of the multi-axis motion controllers. Each of the multi-axis motion controllers independently controls the drive mechanism and the lifting mechanism in the corresponding blade group according to the received general task command.

[0013] In the automatic blade changing device for film cutting described above, the lifting mechanism is a voice coil motor, the voice coil motor has a mover, the mover is provided with a clamping structure for holding the cutting blade, and the cutting blade is directly fixed to the mover through the clamping structure.

[0014] As described above, in the automatic blade changing device for film cutting, the clamping structure includes a mounting groove, a lateral set screw, and a locking nut. The handle of the cutting blade is inserted into the mounting groove. One end of the lateral set screw passes through the side wall of the moving part and abuts against the side of the handle. The locking nut is threaded to the other end of the lateral set screw and presses against the outer wall of the moving part.

[0015] The automatic blade changing device for film cutting as described above includes five blade groups, and each blade group includes five lifting mechanisms.

[0016] Compared with the prior art, the present invention has the following features and advantages: The automatic blade changing device for film cutting proposed in this utility model allows multiple blade groups to move independently on slide rails without interfering with each other. When one blade group is performing cutting, another blade group can be changed simultaneously, thus completing online blade replacement. Furthermore, by using a multi-axis motion controller to independently control each lifting mechanism, the motion coupling between blade groups in traditional mechanical linkage structures is eliminated, significantly improving the efficiency and positioning accuracy of multi-blade collaborative operation in complex cutting processes. Attached Figure Description

[0017] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0018] Figure 1 This is a schematic diagram of the automatic blade changing device for film cutting proposed in this utility model; Figure 2 This is a schematic diagram of the tool assembly in this utility model.

[0019] Explanation of reference numerals in the attached figures

[0020] 100. Automatic blade changer for film cutting; 10. Slide rail; 11. Linear guide rail; 20. Blade set; 21. Base; 22. Multi-axis motion controller; 23. Drive mechanism; 24. Lifting mechanism; 25. Cutting blade; 30. Grating ruler. Detailed Implementation

[0021] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0022] This utility model proposes an automatic blade changing device 100 for film cutting, such as... Figure 1 , Figure 2 As shown, the automatic blade changing device 100 for film cutting includes: The slide rail 10 is positioned above the cutting station on the film conveying path; Multiple tool sets 20 are spaced apart on the slide rail 10. Each tool set 20 includes a base 21, a multi-axis motion controller 22, a drive mechanism 23, and multiple lifting mechanisms 24. The base 21 is slidably engaged with the slide rail 10. Multiple lifting mechanisms 24 are mounted on the base 21. Each lifting mechanism 24 is detachably mounted with a cutting blade 25 and drives the cutting blade 25 to move up and down. The drive mechanism 23 is mounted on the base 21 and drives the base 21 to reciprocate along the slide rail 10. Each lifting mechanism 24 and each drive mechanism 23 are electrically or communicatively connected to the multi-axis motion controller 22. The multi-axis motion controller 22 is used to send independent motion control commands to each drive mechanism 23 and each lifting mechanism 24.

[0023] The automatic blade changing device 100 for film cutting proposed in this utility model allows multiple blade groups 20 to move independently on the slide rail 10 without interfering with each other. When one blade group 20 is performing cutting, another blade group 20 can be changed simultaneously, thus completing the online replacement of the cutting blades. At the same time, the lifting mechanism is independently controlled by a multi-axis motion controller, eliminating the motion coupling between blade groups in the traditional mechanical linkage structure, significantly improving the efficiency and positioning accuracy of multi-blade collaborative operation in complex cutting processes.

[0024] In an optional embodiment of this invention, the slide rail 10 includes parallel spaced linear guide rails 11 and a rack. The drive mechanism 23 includes a servo motor and a gear. The gear is mounted on the output shaft of the servo motor and meshes with the rack. The servo motor drives the gear to rotate, and through the meshing transmission between the gear and the rack, the base 21 reciprocates along the linear guide rail 11. The slide rail 10 uses parallel spaced linear guide rails 11 and a rack, combined with the gear meshing transmission driven by the servo motor, to achieve the separation of transmission and guidance functions: the rack and gear provide high-rigidity, long-stroke linear driving force, while the linear guide rails 11 provide high-precision, low-friction sliding guidance. The synergistic effect of both not only eliminates the deflection and accumulated errors that are easily generated by traditional lead screw drives under long strokes, but also allows multiple tool sets 20 to move independently and in parallel on the same rack.

[0025] In one optional example of this implementation, the linear guide 11 is a roller linear guide, which has the characteristics of high rigidity and low friction, and can provide precise guidance for the movement of the tool, bear the cutting force and ensure the smoothness of the movement.

[0026] In an optional example of this embodiment, the linear guide 11 is horizontally positioned above and perpendicular to the film transport path.

[0027] In an optional example of this implementation, the linear guide 11 is fixedly connected to the film cutting machine by a bracket.

[0028] In one optional example of this implementation, the servo motor is electrically or communicatively connected to the corresponding multi-axis motion controller 22, and the multi-axis motion controller 22 independently issues motion control commands to the servo motor to control the start, stop and rotation of the servo motor.

[0029] In an optional embodiment of this utility model, the automatic blade changer 100 for film cutting also includes a grating ruler 30, which is set parallel to the linear guide rail 11. The grating ruler 30 is used to detect the actual displacement of the base 21 in real time and feed it back to the multi-axis motion controller 22. The multi-axis motion controller 22 corrects the motion control command sent to the servo motor according to the feedback signal from the grating ruler 30, thereby forming a closed-loop feedback control, ensuring the positioning accuracy of the blade group 20, and enabling the multi-blade cutting process.

[0030] In one optional example of this implementation, the resolution range of the grating ruler 30 is 0.1 μm to 1 μm.

[0031] In one optional embodiment of this utility model, the lifting mechanism 24 is a voice coil motor, and the moving part of the voice coil motor is provided with a clamping structure for clamping the cutting blade 25. The cutting blade 25 is directly fixed to the moving part of the voice coil motor through the clamping structure.

[0032] In one optional example of this implementation, multiple voice coil motors in each tool group 20 are electrically or communicatively connected to a multi-axis motion controller 22. The multi-axis motion controller 22 independently issues motion control commands to each voice coil motor, and the mover of each voice coil motor drives the corresponding cutting blade 25 to rise or fall independently, thereby realizing the selective lifting and lowering action of any cutting blade 25 in the tool group 20.

[0033] Furthermore, the multi-axis motion controller 22 has a built-in axis management module. The axis management module assigns a unique axis identifier to each voice coil motor and records whether each voice coil motor is currently in an active or idle state. The axis management module has a global mutex lock function. When any voice coil motor is selected as the target actuator, the axis management module first checks the status of the global mutex lock: if the mutex lock is already occupied, the current axis selection request is rejected; if the mutex lock is in an idle state, the axis management module marks the mutex lock as occupied, records the corresponding axis identifier as active, and sends a lifting action command to the corresponding voice coil motor; after the voice coil motor completes the lifting action and resets to the idle state, the axis management module releases the mutex lock.

[0034] In an optional example of this embodiment, the clamping structure includes a mounting groove, a lateral set screw, and a locking nut. The handle of the cutting blade 25 is inserted into the mounting groove, one end of the lateral set screw passes through the side wall of the output end and abuts against the side of the handle, and the locking nut is threaded to the other end of the lateral set screw and presses against the outer wall of the output end.

[0035] In an optional example of this embodiment, the automatic film cutting tool changer 100 further includes a control unit. The control unit is electrically or communicatively connected to multiple multi-axis motion controllers 22. The control unit is used to issue general task instructions (such as the target cutting position, the required tool number, and the action sequence) to each multi-axis motion controller 22. Each multi-axis motion controller 22 independently controls the drive mechanism 23 and lifting mechanism 24 in its corresponding tool group 20 to perform positioning and tool changing actions according to the received general task instructions. At the same time, the control unit is also used to receive the operating status information reported by each multi-axis motion controller 22 in real time (including the current position of each base 21, the working status of each voice coil motor, and the wear status of each cutting blade 25), and dynamically adjust the task allocation strategy according to the operating status information to achieve coordinated scheduling and fault isolation among multiple tool groups 20.

[0036] Furthermore, the working process of the automatic blade changer 100 for film cutting is as follows: When the control unit sends a command to a tool group 20 to "move the X-axis to 200.000mm", the multi-axis motion controller 22 of the tool group 20 receives the command and plans the motion trajectory. Then, it sends pulse or bus control commands to the servo driver. The driver drives the servo motor to rotate. The motor converts the rotational motion into linear motion through a gear and rack, driving the base 21 to move along the slide rail 10 to the set position. During the entire motion process, the grating ruler measures the actual displacement of the base 21 in real time and feeds it back to the multi-axis motion controller 22. The multi-axis motion controller 22 dynamically corrects the output command according to the deviation between the actual position and the target position until the base 21 accurately reaches the target position, thus forming a closed-loop positioning control of "command issuance → motion execution → real-time feedback → correction and compensation".

[0037] In one optional embodiment of this utility model, five tool groups 20 are provided on the slide rail 10, and the five tool groups 20 are positioned independently and without interference from each other.

[0038] In one optional embodiment of this utility model, each tool assembly 20 is provided with 5 lifting mechanisms 24, and each lifting mechanism 24 is respectively equipped with a cutting blade 25.

[0039] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. An automatic blade changing device for film cutting, characterized in that, The automatic blade changing device for film cutting includes: The slide rail is installed above the cutting station on the film conveying path; Multiple cutter sets are spaced apart on the slide rail. Each cutter set includes a base, a multi-axis motion controller, a drive mechanism, and multiple lifting mechanisms. The base is slidably engaged with the slide rail. The multiple lifting mechanisms are mounted on the base, and each lifting mechanism is detachably mounted with a cutting blade and drives the cutting blade to move up and down. The drive mechanism is mounted on the base and drives the base to reciprocate along the slide rail. The multi-axis motion controller is electrically or communicatively connected to the drive mechanism and each lifting mechanism, and sends independent motion control commands to the drive mechanism and each lifting mechanism.

2. The automatic blade changing device for film cutting as described in claim 1, characterized in that, The slide rail includes parallel spaced linear guide rails and a rack. The drive mechanism includes a servo motor and a gear. The gear is mounted on the output shaft of the servo motor and meshes with the rack. The servo motor drives the gear to rotate, and through the meshing transmission between the gear and the rack, the base is driven to slide back and forth along the linear guide rail.

3. The automatic blade changing device for film cutting as described in claim 2, characterized in that, The linear guide is a roller linear guide.

4. The automatic blade changing device for film cutting as described in claim 2, characterized in that, Each of the servo motors is electrically or communicatively connected to the multi-axis motion controller. The multi-axis motion controller independently issues position commands to each of the servo motors to control the start, stop, and rotation of each servo motor.

5. The automatic blade changing device for film cutting as described in claim 2, characterized in that, The automatic blade changing device for film cutting also includes a grating ruler, which is set parallel to the linear guide rail. The grating ruler is used to detect the actual displacement of the base in real time and feed it back to the multi-axis motion controller. The multi-axis motion controller corrects the control commands sent to the servo motor based on the feedback signal from the grating ruler.

6. The automatic blade changer for film cutting as described in claim 5, characterized in that, The resolution range of the grating ruler is 0.1μm to 1μm.

7. The automatic blade changer for film cutting as described in claim 4, characterized in that, The automatic blade changer for film cutting also includes a control unit, which is electrically or communicatively connected to the plurality of multi-axis motion controllers. The control unit is used to issue a general task instruction to each of the multi-axis motion controllers. Each of the multi-axis motion controllers independently controls the drive mechanism and the lifting mechanism in the corresponding blade group according to the received general task instruction.

8. The automatic blade changing device for film cutting as described in claim 1, characterized in that, The lifting mechanism is a voice coil motor, which has a mover. The mover is provided with a clamping structure for holding the cutting blade, and the cutting blade is directly fixed to the mover through the clamping structure.

9. The automatic blade changing device for film cutting as described in claim 8, characterized in that, The clamping structure includes a mounting groove, a lateral set screw, and a locking nut. The handle of the cutting blade is inserted into the mounting groove. One end of the lateral set screw passes through the side wall of the moving part and abuts against the side of the handle. The locking nut is threaded to the other end of the lateral set screw and presses against the outer wall of the moving part.

10. The automatic blade changing device for film cutting as described in claim 1, characterized in that, The automatic blade changing device for film cutting includes five blade groups, and each blade group includes five lifting mechanisms.

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