Cutting device in multi-color feeding system of FDM printer

Abstract

The utility model discloses a cutting device in a multicolor feeding system of an FDM printer, which comprises a slide rail mounting frame, a first clamping groove and a second clamping groove are arranged on two sides of the lower end face of the slide rail mounting frame, a positioning hole is arranged at the upper end of the slide rail mounting frame, and a steering engine is mounted on the surface of the upper end of the slide rail mounting frame opposite to the first clamping groove. A transverse steering engine arm penetrating through the positioning hole is arranged on an output rotating shaft of the steering engine, a first U-shaped groove hole with a downward opening and a first through hole are formed in the sliding rail installation frame between the first clamping groove and the second clamping groove, a movable sliding block is arranged on a sliding rail formed by the first clamping groove and the second clamping groove, and a downward U-shaped boss is arranged on the outward face of the sliding block. A U-shaped boss of the sliding block is provided with a countersunk head through hole and a second U-shaped groove hole with a downward opening, the countersunk head through hole in the position of the U-shaped boss is provided with an outward Bowden head, the inward face of the sliding block is provided with a curve boss and a double-edged knife, and a connecting rod is arranged between the steering engine arm and the sliding block. According to the device, accurate material cutting can be achieved, waste materials are reduced, and the material changing efficiency is improved.

Description

Technical Field

[0001] This invention relates to 3D printer consumable cutting technology, specifically a cutting device in a multi-color feeding system of an FDM printer. Background Technology

[0002] When FDM printers perform multi-color printing, the filament in the printhead usually needs to be retracted and replaced with a different type of filament. To prevent the filament from clogging the feed tube during the next use, it is generally necessary to cut the filament. Common cutting devices are located at the FDM printer printhead and use a lever principle. By moving the printhead, a lever collides with a specific position on the printer, causing the cutter to move towards the filament channel and cut the filament laterally within the channel. This method has limited cutting space and increases the load on the X and Y axes of the printhead, reducing printing speed and affecting printing accuracy. Current cutting devices are compact in structure, but are difficult to disassemble and reassemble when clogging occurs, and have a low tolerance for error. Utility Model Content

[0003] The purpose of this invention is to address the problem that the cutting device in existing multi-color feeders for FDM printers is usually located at the printer nozzle, which is limited by space when changing consumables, and is difficult to disassemble and reassemble when material blockage occurs, with a low tolerance for error. This invention proposes a cutting device for a multi-color feeder system in an FDM printer. This device can achieve precise material cutting, reduce waste, and improve feeder efficiency.

[0004] The technical solution to achieve the purpose of this utility model is:

[0005] A cutting device in a multi-color feeding system of an FDM printer includes a slide rail mounting bracket. The lower end face of the slide rail mounting bracket has two vertically aligned first and second slots of the same specifications, forming a slide rail. The upper end of the slide rail mounting bracket has a positioning hole. A servo motor is mounted on the upper end of the slide rail mounting bracket opposite to the first slot. The output shaft of the servo motor has a servo arm that passes horizontally through the positioning hole. The servo arm is on the same side as the first slot and faces the second slot. A first passage is provided on the slide rail mounting bracket between the first and second slots. The slide rail formed by the first and second slots has a hole and a downward-facing first U-shaped slot. The slide rail has a movable slider. The outward-facing surface of the slider has a downward-facing U-shaped boss. The U-shaped boss of the slider has a countersunk through hole and a downward-facing second U-shaped slot located below the countersunk through hole. The countersunk through hole at the U-shaped boss has an outward-facing Bowden head. The inward-facing surface of the slider has a curved boss and a double-edged blade. The countersunk through hole passes through the U-shaped boss and the curved boss. A connecting rod is provided between the servo arm and the slider.

[0006] The center point of the countersunk hole and the center point of the second U-shaped slot are on the same vertical line.

[0007] When the servo motor is not in operation, the countersunk through hole is aligned and connected with the first through hole.

[0008] When the servo controls the servo arm to rotate upward, the connecting rod drives the slider to move upward along the first slot and the second slot, and the second U-shaped slot aligns and connects with the first through hole.

[0009] A chip removal groove is provided between the countersunk through hole and the second U-shaped groove on the inward-facing surface of the slider.

[0010] The double-edged knife is arrow-shaped, with the arrowhead pointing laterally toward the second slot. The blade of the double-edged knife rests between the countersunk through hole and the second U-shaped slot, and the blade portion of the double-edged knife covers the second U-shaped slot.

[0011] A servo motor pad is provided between the slide rail mounting bracket and the servo motor.

[0012] When the slider is installed in the first slot and the second slot, the end of the fastener fixing the double-edged blade extends into the first U-shaped slot hole, and when the slider moves upward, the end of the fastener of the double-edged blade limits the slider.

[0013] The servo motor controls its rotation speed through the control system, so as to achieve the purpose of connecting the first through hole with the second U-shaped slot hole or countersunk through hole when the slider slides or does not slide.

[0014] The end of the servo arm away from the servo shaft is provided with a set of first mounting holes at intervals, and the U-shaped boss of the slider is provided with a second mounting hole. The first mounting holes and the second mounting holes are used to install the connecting rod.

[0015] The slide rail mounting bracket has two guide rails on both sides of the lower back end that are in the same direction as the first slot, and the guide rails have concentric holes.

[0016] The slide rail mounting bracket is installed on the material selection mechanism of the printer material changing system through two guide rails on its back and concentric holes, so that the output tube of the material selection mechanism is connected to the countersunk through hole.

[0017] The Bowden head is connected to the printer nozzle via a consumable tube.

[0018] Installation principle: First, install the Bowden head onto the slider through the countersunk hole, and fix the double-edged blade on the back of the slider with fasteners; next, fix the servo and servo pad to the upper end of the slide rail mounting bracket with fasteners, and then install the servo arm; finally, insert the slider into the slide rail formed by the first and second slots of the slide rail mounting bracket, and use fasteners to connect the connecting rod to the servo arm and the slider respectively, and adjust the angle to complete the installation.

[0019] Working principle: The filament is fed from the hopper through the feeding device into the material selection mechanism, then through the first through hole of the slide rail mounting bracket, and into the filament tube connected to the Bowden head. The material selection mechanism pushes it into the printer nozzle for heating, extrusion, and deposition to achieve printing. When the filament needs to be returned, the pointed tip is cut off. After the filament is completely returned to the hopper, the servo motor reverses its direction, causing the slider to move upward. At this point, the second U-shaped slot of the slider aligns with the first through hole of the slide rail mounting bracket, and the material selection mechanism delivers the pointed tip of the filament to the double-edged blade. The servo motor rotates forward, the slider moves downward, and the double-edged blade falls, cutting off the tip of the filament. When the filament does not need to be returned, the servo motor receives a signal and reverses its direction, causing the slider to move upward, and the filament is cut off upward by the double-edged blade.

[0020] The beneficial effects of this technical solution are:

[0021] 1. This technical solution is located outside the 3D printer, and its structure is not limited by space. It can be made of aluminum alloy material with high hardness, and its durability and precision are significantly improved compared with the existing technology. At the same time, it solves the problems of high printer nozzle load, low precision and motor step loss caused by collision cutting in the existing cutting method.

[0022] 2. This technical solution uses a double-edged blade for the cutter. The servo arm rotates at a set angle under the drive of the servo motor, and the slider moves up and down along the slide rail via the connecting rod, which can complete various types of cutting tasks.

[0023] 3. This technical solution converts the oscillation of the servo motor into the up-and-down movement of the cutter, resulting in short material cutting time and high efficiency. At the same time, it is combined with high-precision cutting control technology to achieve accurate material cutting and reduce waste.

[0024] 4. This technical solution has a simple structure, is easy to assemble and disassemble, and is equipped with a chip removal groove to effectively avoid material blockage and has a high fault tolerance rate. Attached Figure Description

[0025] Figure 1 Exploded view of the structural installation of the embodiment;

[0026] Figure 2 This is an assembly diagram of an embodiment;

[0027] Figure 3 This is a schematic diagram showing the installation location in this embodiment;

[0028] Figure 4 for Figure 2 A schematic diagram of the slider's back assembly;

[0029] Figure 5 This is a schematic diagram of a slider without a double-edged blade on the back.

[0030] In the diagram, 1. Slide rail mounting bracket; 2. First slot; 3. Second slot; 4. Positioning hole; 5. Servo motor; 6. Servo motor arm; 7. First U-shaped slot hole; 8. First through hole; 9. Slider; 10. Countersunk through hole; 11. Second U-shaped slot hole; 12. Bowden head; 13. Double-edged blade; 14. Connecting rod; 15. Chip removal groove; 16. Servo motor pad; 17. First mounting hole; 18. Second mounting hole; 19. Material selection mechanism; 20. Printer nozzle; 21. Consumable tube. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the present invention. Example

[0032] Reference Figure 1 , Figure 2 A cutting device in a multi-color feeding system of an FDM printer includes a slide rail mounting bracket 1. The lower end face of the slide rail mounting bracket 1 has two vertically aligned first and second slots 2 and 3 of the same specifications, forming a slide rail. The upper end of the slide rail mounting bracket 1 has a positioning hole 4. A servo motor 5 is mounted on the upper end of the slide rail mounting bracket 1 opposite to the first slot 2. The output shaft of the servo motor 5 has a servo motor arm 6 that passes horizontally through the positioning hole 4. The servo motor arm 6 is on the same side as the first slot 2 and faces the second slot 3. A first through hole 8 is provided on the slide rail mounting bracket 1 between the first slot 2 and the second slot 3. The first U-shaped slot 7 faces downwards and is close to the first slot 2. The slide rail formed by the first slot 2 and the second slot 3 is provided with a movable slider 9. The outward-facing surface of the slider 9 is provided with a downward-facing U-shaped boss. The U-shaped boss of the slider 9 is provided with a countersunk through hole 10 and a second U-shaped slot 11 facing downwards and located below the countersunk through hole 10. The countersunk through hole 10 at the U-shaped boss is provided with an outward-facing Bowden head 12. The inward-facing surface of the slider 9 is provided with a curved boss and a double-edged blade 13. The countersunk through hole 10 passes through the U-shaped boss and the curved boss. A connecting rod 14 is provided between the servo arm 6 and the slider 9.

[0033] The center point of the countersunk hole 10 and the center point of the second U-shaped slot 11 are on the same vertical line.

[0034] When the servo motor 5 is not working, the countersunk through hole 10 is aligned and connected with the first through hole 8.

[0035] When the servo motor 5 controls the servo arm 6 to rotate upward, the connecting rod 14 drives the slider 9 to move upward along the first slot 2 and the second slot 3, and the second U-shaped slot 11 is aligned and connected with the first through hole 8.

[0036] like Figure 5 As shown, a chip removal groove 15 is provided between the countersunk through hole 10 on the inner surface of the slider 9 and the second U-shaped groove hole 11.

[0037] like Figure 4 As shown, the double-edged blade 13 is arrow-shaped, with the arrowhead pointing laterally toward the second slot 3. The blade of the double-edged blade 13 rests between the countersunk through hole 10 and the second U-shaped slot hole 11, and the blade portion of the double-edged blade 13 blocks the second U-shaped slot hole 11.

[0038] A servo motor pad 16 is provided between the slide rail mounting bracket 1 and the servo motor 5. In this example, there are two servo motor pads 16, which are located on both sides of the positioning hole 4.

[0039] When the slider 9 is movably mounted in the first slot 2 and the second slot 3, the fastener end of the fixed double-edged blade 13 extends into the first U-shaped slot 7. When the slider 9 moves upward, the fastener end of the double-edged blade 13 limits the slider 9.

[0040] The servo motor 5 controls its rotation speed through the control system, so as to achieve the purpose of connecting the first through hole 8 with the second U-shaped slot hole 11 or the countersunk through hole 10 when the slider 9 slides or does not slide.

[0041] The end of the servo arm 6 away from the servo shaft is provided with a set of first mounting holes 17 at intervals, and the U-shaped boss of the slider 9 is provided with second mounting holes 18. The first mounting holes 17 and the second mounting holes 18 are used to install the connecting rod 14. In this example, there are 3 first mounting holes 17.

[0042] The slide rail mounting bracket 1 has two guide rails on both sides of the lower back end that are in the same direction as the first slot 2, and the guide rails have concentric holes.

[0043] like Figure 3 As shown, the slide rail mounting bracket 1 is mounted on the material selection mechanism 19 of the printer material changing system through two guide rails on its back and concentric holes, so that the output tube of the material selection mechanism 19 is connected to the countersunk through hole 10.

[0044] The Bowden head 12 is connected to the printer nozzle 20 via a consumable tube 21.

[0045] Installation principle: First, install the Bowden head 13 onto the slider 9 at the countersunk through hole 10 position, and fix the double-edged blade 13 on the back of the slider 9 with fasteners; next, fix the servo motor 5 and servo motor pad 16 to the upper end of the slide rail mounting bracket 1 with fasteners, and then install the servo arm 6; finally, insert the slider 9 into the slide rail formed by the first slot 2 and the second slot 3 of the slide rail mounting bracket 1, and use fasteners to connect the connecting rod 14 to the servo arm 6 and the slider 9 respectively, and adjust the angle to complete the installation.

[0046] Working principle: The consumable material passes from the hopper through the feeding device into the material selection mechanism 19, then through the first through hole 8 of the slide rail mounting bracket 1, and enters the consumable tube 21 connected to the Bowden head 12. It is then pushed by the material selection mechanism 19 into the printer nozzle 20 for heating, extrusion, and deposition to achieve printing. When the consumable material needs to be returned and removed, the pointed tip of the consumable material is cut off. After the consumable material is completely returned to the hopper, the servo motor 5 performs a reverse action, driving the slider 9 to move upward. At this time, the second U-shaped slot 11 of the slider 9 is aligned and connected with the first through hole 8 of the slide rail mounting bracket 1. The material selection mechanism 19 sends the pointed tip of the consumable material to the double-edged blade 13. The servo motor 5 rotates forward, the slider 9 moves downward, and the double-edged blade 13 falls, cutting off the tip of the consumable material. When the consumable material does not need to be returned, the servo motor 5 receives a signal and performs a reverse action, driving the slider 9 to move upward, and the consumable material is cut off upward by the double-edged blade 13.

Claims

1. A cutting device in a multi-color feeding system of an FDM printer, characterized in that, The system includes a slide rail mounting bracket. The lower end face of the mounting bracket has two vertically aligned first and second slots of the same specifications, forming a slide rail. The upper end of the mounting bracket has a positioning hole. A servo motor is mounted on the upper end of the mounting bracket opposite to the first slot. The servo motor's output shaft has a servo arm that passes horizontally through the positioning hole. The servo arm is on the same side as the first slot and faces the second slot. The slide rail mounting bracket between the first and second slots has a first through hole and a downward-facing first U-shaped slot. The first U-shaped slot is close to the first slot. A movable slider is mounted on the slide rail formed by the first and second slots. The outward-facing surface of the slider has a downward-facing U-shaped boss. The U-shaped boss of the slider has a countersunk through hole and a downward-facing second U-shaped slot located below the countersunk through hole. The countersunk through hole at the U-shaped boss has an outward-facing bow. The inward-facing surface of the slider has a curved boss and a double-edged blade. The countersunk through hole passes through the U-shaped boss and the curved boss. A connecting rod is provided between the servo arm and the slider.

2. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, The center point of the countersunk hole and the center point of the second U-shaped slot are on the same vertical line.

3. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, When the servo motor is not in operation, the countersunk through hole is aligned and connected with the first through hole.

4. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, When the servo controls the servo arm to rotate upward, the connecting rod drives the slider to move upward along the first slot and the second slot, and the second U-shaped slot aligns and connects with the first through hole.

5. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, A chip removal groove is provided between the countersunk through hole on the inner surface of the slider and the second U-shaped groove.

6. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, The double-edged blade is arrow-shaped, with the arrowhead pointing laterally toward the second slot, and the blade portion of the double-edged blade obstructs the second U-shaped slot.

7. The cutting device in the multi-color feeding system of the FDM printer according to claim 1, characterized in that, A servo motor pad is provided between the slide rail mounting bracket and the servo motor.

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