A printing wire automatic cutting device and 3D printer

Abstract

The application is suitable for the field of 3D printing technology, and provides a printing wire automatic cutting device and a 3D printer, which comprises a printing nozzle, a cutter, a movable top rod and a slide rail; the movable top rod comprises a first force arm, a shaft and a second force arm; the inside of the printing nozzle is provided with a wire channel; the printing nozzle is further provided with a limiting groove; the side of the printing nozzle is provided with a window; the front end of the cutter is provided with a blade, and the tail end of the cutter is exposed from the window; the cutter moves in the limiting groove; the movable top rod is movably connected to one end of the slide rail through the shaft; the printing nozzle slides on the slide rail towards the movable top rod, the printing nozzle pushes the first force arm, drives the second force arm to rotate around the shaft, and pushes the tail end of the cutter through the second force arm, so that the blade cuts the printing wire in the wire channel. The scheme can be used to cut the wire to facilitate the switching of the printing wire, can generate the cutting force by the movement of the printing nozzle, and can also use the lever type movable top rod to amplify the cutting force.

Description

Technical Field

[0001] This application relates to the field of 3D printing technology, specifically to an automatic filament cutting device and a 3D printer. Background Technology

[0002] In known fused deposition modeling (FDM) 3D printing technologies, when changing filaments or printing different colors, the filament needs to be retracted from the printhead. Since the filament in the printhead nozzle is in a molten, heated state, retracting the entire filament can cause stringing or other residues in the filament channel of the printhead, potentially leading to malfunctions. Therefore, it is necessary to cut the portion of the filament near the printhead before retracting it to prevent the molten filament from being carried away during retraction. Thus, a convenient and practical automatic filament cutting device is needed to address this problem. Summary of the Invention

[0003] The purpose of this application is to provide an automatic printing filament cutting device for cutting off the printing filament in the filament channel when switching printing filaments, so as to facilitate the retraction of the printing filament.

[0004] According to a first aspect of this application, an automatic cutting device for printed wires is provided, comprising: a print head, a cutter, a movable push rod, and a slide rail; wherein the movable push rod comprises a first lever arm, a shaft, and a second lever arm.

[0005] The print head has a wire channel inside; the print head also has a limiting groove; the print head has a window on its side; the cutter has a blade at its front end, and the tail end of the cutter protrudes through the window; the cutter moves within the limiting groove.

[0006] The movable push rod is movably connected to one end of the slide rail via the shaft; the print head slides on the slide rail toward the movable push rod, the print head pushes the first force arm, drives the second force arm to rotate around the shaft, and contacts and pushes the tail end of the cutter through the second force arm, so that the blade cuts the printed wire in the wire channel.

[0007] Furthermore, the printhead includes a housing, a limiting groove assembly, an extrusion assembly, and a nozzle; the limiting groove assembly, the extrusion assembly, and the nozzle are fixed to the housing; the extrusion assembly is used to drive the printing filament to slide in the filament channel; the nozzle is used to heat the printing filament and form a sprayed filament; a portion of the filament channel is provided on the limiting groove assembly; the limiting groove is provided on the limiting groove assembly; the window is provided on the side of the housing; the limiting groove is exposed through the window.

[0008] Furthermore, the cutter includes a blade, a sliding block, and a spring; the blade is disposed at the front end of the sliding block; the sliding block is held against the limiting groove by the spring; and the tail end of the sliding block is exposed through the window.

[0009] Furthermore, the plane containing the blade is perpendicular to the direction of the wire channel.

[0010] Preferably, the cutting edge of the blade is a straight edge, a convex arc edge, a concave arc edge, or a slanted straight edge.

[0011] Furthermore, the second lever arm is provided with a protrusion; the protrusion contacts and pushes the tail end of the cutter, causing the blade to cut the printed wire in the wire channel.

[0012] Furthermore, the length of the first lever arm is greater than the length of the second lever arm.

[0013] According to a second aspect of this application, a 3D printer is also provided, including the aforementioned automatic filament cutting device.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] 1. Using a cutter to cut off the part of the filament near the printing nozzle can prevent the molten part of the filament from adhering to the filament channel and causing malfunctions when the filament is pulled back;

[0016] 2. Using an external movable push rod to push the cutter to cut the wire, this solution of separating the movable push rod and placing it externally instead of setting it on the print head can reduce the cross-sectional area and volume of the print head, thereby minimizing the structural area of ​​the printer for the same printing area, which is beneficial to saving manufacturing costs and packaging and logistics costs.

[0017] 3. The external movable push rod is used to push the cutter to cut the wire. At the same time, the lever-type movable push rod can amplify the cutting force, making it easier to cut the wire. Compared with the solution of the print head directly pushing the cutter, it can avoid the drive belt from loosening due to excessive driving force, and it can also avoid the X-axis motor from losing steps due to excessive driving force, thus avoiding printing errors caused by lost steps. Attached Figure Description

[0018] Figure 1 This is an overall embodiment diagram of the automatic wire cutting device according to the present application.

[0019] Figure 2 This is a partially exploded embodiment diagram of the printhead in this application;

[0020] Figure 3This is a schematic diagram of the limiting groove assembly and cutter in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram illustrating the working principle of the automatic wire cutting device according to an embodiment of this application.

[0022] Label Explanation:

[0023] Printing nozzle 1; cutter 2; slide rail 3; movable top rod 4; wire channel 10; housing 11; limiting groove assembly 12; extrusion assembly 13; nozzle 14; blade 21; sliding block 22; spring 23; drive belt 31; first lever arm 41; shaft 42; second lever arm 43; window 111; limiting groove 121; protrusion 431. Detailed Implementation

[0024] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Figure 1 This is an overall embodiment diagram of the automatic wire cutting device for printing according to an embodiment of this application. As shown in the figure, the automatic wire cutting device for printing includes: a printing nozzle 1, a cutter 2, a slide rail 3, and a movable top rod 4;

[0026] The print head 1 is provided with a limiting groove 121; the print head 1 is provided with a window 111 on its side; the front end of the cutter 2 is provided with a blade 21, and the tail end of the cutter 2 is exposed through the window 111; the cutter 2 moves in the limiting groove 121; in addition, the print head 1 shown in this figure also includes a housing 11, an extrusion assembly 13, and a nozzle 14.

[0027] The movable push rod 4 is movably connected to one end of the slide rail 3 via the shaft 42; the print head 1 slides on the slide rail 3 toward the movable push rod 4, so that the movable push rod 4 contacts and pushes the tail end of the cutter 2, thereby causing the blade 21 to cut the print line in the line channel 10.

[0028] Figure 2 This is a partially exploded embodiment diagram of the printhead in this application. As shown, in this embodiment, the printhead 1 includes a housing 11, a limiting groove assembly 12, an extrusion assembly 13, and a nozzle 14; the limiting groove assembly 12, the extrusion assembly 13, and the nozzle 14 are fixed to the housing 11; the extrusion assembly 13 is used to drive the printing filament in... Figure 4The wire slides in the filament channel 10 shown; the nozzle 14 is used to heat the printing filament and form a sprayed filament; a portion of the filament channel 10 is provided on the limiting groove assembly 12; for details, see the schematic diagram of the filament channel 10. Figure 4 The limiting groove 121 is provided on the limiting groove assembly 12; the window 111 is provided on the side of the housing 11; the limiting groove 121 is exposed through the window 111.

[0029] As can be seen from the embodiment shown in the figure, another possible implementation is to integrate the limiting groove assembly 12 and the housing 11 into an integral molded housing, and to provide the limiting groove 121 and the window 111 on the integral molded housing.

[0030] In addition, the figure also shows that the cutter 2 includes a blade 21, a sliding block 22, and a spring 23; the blade 21 is disposed at the front end of the sliding block 22; the sliding block 22 is held against the limiting groove 121 by the spring 23; the tail end of the sliding block 22 is exposed through the window 111.

[0031] Figure 3 This is a schematic diagram of the limiting groove assembly and cutter in an embodiment of this application. As shown in the figure, this figure is a further enlargement of the limiting groove assembly and cutter. It can be clearly seen that the limiting groove assembly 12 is provided with a limiting groove 121; the blade 21 is disposed at the front end of the sliding block 22; the sliding block 22 is held against the limiting groove 121 by a spring 23; the tail end of the sliding block 22 is exposed through the window 111. Specifically, the side view of the sliding block 22 is L-shaped; one end of the spring 23 abuts against the inner side of the sliding block 22, and the other end abuts against the inner wall of the limiting groove 121. Furthermore, the cutting edge of the blade 21 in this figure is straight.

[0032] Figure 4 This is a schematic diagram illustrating the working principle of the automatic wire cutting device according to an embodiment of this application. As shown in the figure, the movable top rod 4 includes a first lever arm 41, a shaft 42, and a second lever arm 43; specifically, a protrusion 431 is also provided on the second lever arm 43.

[0033] In addition, it can be seen that a filament channel 10 is provided inside the print head 1; a portion of the filament channel 10 is provided on the limiting groove assembly 12; the filament channel 10 is in communication with the nozzle 14.

[0034] The movable push rod 4 is movably connected to one end of the slide rail 3 via the shaft 42; the drive belt 31 drives the print head 1 to slide on the slide rail 3 toward the movable push rod 4, the print head 1 pushes the first force arm 41, drives the second force arm 43 to rotate around the shaft 42, and contacts and pushes the tail end of the cutter 2 through the protrusion 431 on the second force arm 43, so that the blade 21 cuts the printed line in the line channel 10.

[0035] Specifically, in this figure, the length of the first lever arm 41 is approximately three times the length of the second lever arm 43. Therefore, if the force exerted by the print head 1 on the first lever arm 41 is F, then after lever amplification, the force exerted by the protrusion 431 on the tail end of the cutter 2 is 3F. Thus, it can be seen that this application uses a lever-type movable push rod, which can amplify the cutting force of the cutter 2. This makes cutting wires easier and, compared to the solution where the print head directly pushes the cutter, avoids the drive belt 31 becoming loose due to excessive driving force, and also avoids the motor driving the drive belt 31 losing steps due to excessive driving force, thus avoiding printing errors caused by lost steps.

[0036] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An automatic cutting device for printed wires, characterized in that, include: Printing nozzle (1), cutter (2), slide rail (3), movable push rod (4); wherein the movable push rod (4) includes a first lever arm (41), a shaft (42), and a second lever arm (43); The print head (1) has a wire channel (10) inside; the print head (1) also has a limiting groove (121); the print head (1) has a window (111) on its side; the cutter (2) has a blade (21) at its front end, and the tail end of the cutter (2) is exposed through the window (111); the cutter (2) moves in the limiting groove (121); The movable push rod (4) is movably connected to one end of the slide rail (3) via the shaft (42); the print head (1) slides on the slide rail (3) toward the movable push rod (4), the print head (1) pushes the first force arm (41), causing the second force arm (43) to rotate around the shaft (42), and the second force arm (43) contacts and pushes the tail end of the cutter (2), so that the blade (21) cuts the printing wire in the wire channel (10).

2. The automatic wire cutting device according to claim 1, characterized in that, The print head (1) includes a housing (11), a limiting groove assembly (12), an extrusion assembly (13), and a nozzle (14); the limiting groove assembly (12), the extrusion assembly (13), and the nozzle (14) are fixed to the housing (11); the extrusion assembly (13) is used to drive the printing filament to slide in the filament channel (10); the nozzle (14) is used to heat the printing filament and form a sprayed filament; a portion of the filament channel (10) is provided on the limiting groove assembly (12); the limiting groove (121) is provided on the limiting groove assembly (12); the window (111) is provided on the side of the housing (11); the limiting groove (121) is exposed through the window (111).

3. The automatic wire cutting device according to claim 1, characterized in that, The cutter (2) includes a blade (21), a sliding block (22), and a spring (23); the blade (21) is disposed at the front end of the sliding block (22); the sliding block (22) is held against the limiting groove (121) by the spring (23); the tail end of the sliding block (22) is exposed through the window (111).

4. The automatic wire cutting device according to claim 1, characterized in that, The plane containing the blade (21) is perpendicular to the direction of the wire channel (10).

5. The automatic wire cutting device according to claim 1, characterized in that, The cutting edge of the blade (21) can be a straight edge, a convex arc edge, a concave arc edge, or a slanted straight edge.

6. The automatic wire cutting device according to claim 1, characterized in that, The second lever arm (43) is provided with a protrusion (431); the protrusion (431) contacts and pushes the tail end of the cutter (2), causing the blade (21) to cut the printed wire in the wire channel (10).

7. The automatic wire cutting device according to claim 1, characterized in that, The length of the first lever arm (41) is greater than the length of the second lever arm (43).

8. A 3D printer, characterized in that, Includes an automatic cutting device for printed wires according to any one of claims 1 to 7.

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