A 3D printing device

Abstract

The application relates to the field of 3D printing technology, in particular to a 3D printing device which comprises a base, a frame arranged on the base, a workbench arranged on the frame, a three-dimensional movement mechanism arranged on the frame, a driving mechanism arranged on the frame and a transmission mechanism arranged on the frame and connected with the three-dimensional movement mechanism and the driving mechanism. The transmission mechanism can buffer the impact through a conveying belt, so that the influence of the impact is slowed down, and the normal operation of the mechanical equipment is protected.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and more particularly to a 3D printing device. Background Technology

[0002] A 3D printer, also known as a three-dimensional printer (3DP), is a type of cumulative manufacturing technology, or rapid prototyping technology. It is a machine that uses a digital model file as a basis and employs special wax materials, powdered metals, or plastics and other adhesive materials to create three-dimensional objects by printing layers of adhesive materials.

[0003] The i3 structure of the 3D printer is relatively simple, with a simple gantry frame that saves materials. However, due to the large weight of the platform, the inertia during printing is naturally large, which increases the load on the stepper motor and the timing belt, and accelerates the wear of the timing belt. Summary of the Invention

[0004] To address the aforementioned technical deficiencies in existing technologies, this invention provides a 3D printing device with a transmission mechanism that can buffer impacts through a conveyor belt and a conveyor shaft, effectively solving the problems described in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] This invention discloses a 3D printing device, comprising:

[0007] Base;

[0008] The frame is mounted on the base;

[0009] The workbench is mounted on the frame;

[0010] A three-dimensional motion mechanism is mounted on the frame.

[0011] The drive mechanism is mounted on the frame;

[0012] A transmission mechanism is mounted on the frame and connected to the three-dimensional motion mechanism and the drive mechanism.

[0013] In any of the above embodiments, it is preferred that the three-dimensional motion mechanism includes an X-axis motion mechanism, a Y-axis motion mechanism, and a Z-axis motion mechanism;

[0014] The Y-axis motion mechanism is connected to the frame, the Z-axis motion mechanism is connected to the frame, and the X-axis motion mechanism is connected to the Z-axis motion mechanism.

[0015] The driving mechanism drives the transmission mechanism, which in turn drives the Y-axis motion mechanism to move horizontally in the Y-axis direction, drives the Z-axis motion mechanism to move vertically in the Z-axis direction, and drives the X-axis motion mechanism to move horizontally in the X-axis direction.

[0016] In any of the above embodiments, it is preferred that the Y-axis motion mechanism includes two symmetrically arranged Y-axis sliding guides, which are horizontally arranged on the frame.

[0017] The Z-axis motion mechanism includes two symmetrically arranged Z-axis sliding guides, which are vertically arranged on both sides of the frame.

[0018] The X-axis motion mechanism includes an X-axis sliding guide rail, with both ends of the X-axis sliding guide rail horizontally mounted on the Z-axis sliding guide rail, and a print head mounted on the X-axis sliding guide rail.

[0019] In any of the above embodiments, it is preferred that the Y-axis sliding guide rail is slidably connected to the worktable and connected to the bottom of the frame; and that vibration damping springs are provided at the four corners of the worktable.

[0020] In any of the above embodiments, it is preferred that the transmission mechanism includes a first conveyor belt, a first drive shaft, and a first driven shaft;

[0021] The first driven shaft is connected to the inner surface of the bottom of the frame, and the first driving shaft is connected to the output end of the first motor;

[0022] The first conveyor belt is connected to the bottom of the worktable and is connected to the first drive shaft and the first driven shaft.

[0023] In any of the above embodiments, it is preferred that the transmission mechanism further includes a second drive shaft, a third drive shaft, a second driven shaft, a third driven shaft, a fourth driven shaft, and a fifth driven shaft disposed on the frame;

[0024] The sixth driven shaft and the seventh driven shaft are mounted on the X-axis sliding guide rail;

[0025] The second drive shaft is connected to the output end of the second motor, and the third drive shaft is connected to the output end of the third motor.

[0026] In any of the above embodiments, it is preferred that the transmission mechanism further includes a second conveyor belt and a third conveyor belt;

[0027] One end of the second conveyor belt is connected to the outer surface of the print head, and passes sequentially through the sixth driven shaft, the third driven shaft, the second driven shaft, the second drive shaft, and the seventh driven shaft to connect to the other side of the outer surface of the print head;

[0028] One end of the third conveyor belt is connected to the outer surface of the print head, and passes sequentially through the seventh driven shaft, the fifth driven shaft, the fourth driven shaft, the third drive shaft, and the sixth driven shaft to connect to the other side of the outer surface of the print head.

[0029] In any of the above embodiments, it is preferred that a control panel is provided on the upper part of the frame; and that circuit components are provided on the side of the frame near the third motor.

[0030] In any of the above embodiments, it is preferred that the main unit is disposed on the side of the frame closer to the second motor.

[0031] In any of the above embodiments, it is preferred that a power interface and a power switch are provided on the outer surface of the frame.

[0032] The beneficial effects of the present invention compared with the prior art.

[0033] The base provides stable support for the equipment, while the frame provides structural support for the entire 3D printing equipment, ensuring its stability and accuracy. The worktable is a platform for placing the object to be printed. The 3D motion mechanism is responsible for precise motion control in the X, Y, and Z axes, enabling the print head to move along a precise path, thus achieving accurate positioning of the 3D printed object. The drive mechanism provides power for the printing process. The transmission mechanism connects the 3D motion mechanism and the drive mechanism, allowing them to work together. The transmission mechanism features smooth transmission and shock absorption, effectively buffering and reducing vibration while smoothly transmitting torque, thereby mitigating the impact and protecting the normal operation of the machinery. The transmission mechanism can also control the object's movement speed and transport direction by adjusting the rotation speed, direction, and conveyor belt tilt angle, achieving precise control and positioning of the object, thus enabling accurate 3D printing and providing more possibilities for creation and manufacturing. Furthermore, it features low cost, no lubrication required, and easy maintenance, extending the equipment's lifespan. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments thereof, are used to explain the present invention, but do not constitute a limitation thereof.

[0035] Figure 1 This is a perspective view of the 3D printing equipment of the present invention;

[0036] Figure 2 This is another perspective view of the 3D printing equipment of the present invention;

[0037] Figure 3 This is a perspective view of the transmission mechanism of the 3D printing equipment of the present invention.

[0038] The following are the labeling instructions in the diagram: 1. Base; 2. Frame; 3. Worktable; 4. X-axis sliding guide; 5. Y-axis sliding guide; 6. Z-axis sliding guide; 31. Vibration damping spring; 41. Sixth driven shaft; 42. Seventh driven shaft; 43. Second conveyor belt; 44. Third conveyor belt; 51. First conveyor belt; 52. First drive shaft; 53. First driven shaft; 61. Second drive shaft; 62. Second driven shaft; 63. Third driven shaft; 64. Third drive shaft; 65. Fourth driven shaft; 66. Fifth driven shaft; 71. Print head; 72. Control panel; 73. Circuit components; 74. Main unit; 75. Power interface; 76. Power switch; 81. First motor; 82. Second motor; 83. Third motor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0040] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0041] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] To better understand the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figures 1 to 3 As shown, a 3D printing device includes...

[0045] Base 1;

[0046] Frame 2 is mounted on the base 1;

[0047] Workbench 3 is mounted on the frame 2;

[0048] A three-dimensional motion mechanism is mounted on the frame 2;

[0049] The drive mechanism is mounted on the frame 2;

[0050] A transmission mechanism is mounted on the frame 2 and connected to the three-dimensional motion mechanism and the drive mechanism.

[0051] In embodiments of the present invention, the base provides stable support for the device, the frame provides structural support for the entire 3D printing device, ensuring the stability and accuracy of the device, and the worktable is a platform for placing the object to be printed; the three-dimensional motion mechanism is responsible for precise motion control in the X, Y, and Z axis directions, enabling the print head to move along a precise path, thereby achieving precise positioning of the three-dimensional printed object; the drive mechanism provides power for the printing process; the transmission mechanism connects the three-dimensional motion mechanism and the drive mechanism, enabling the drive device and the three-dimensional motion mechanism to work together; the transmission mechanism has the characteristics of smooth transmission and shock absorption, and can play a good role in buffering and damping vibration while smoothly transmitting torque, thereby mitigating the impact of impact and protecting the normal operation of the mechanical equipment.

[0052] like Figures 1 to 3 As shown, the three-dimensional motion mechanism includes an X-axis motion mechanism, a Y-axis motion mechanism, and a Z-axis motion mechanism;

[0053] The Y-axis motion mechanism is connected to the frame 2, the Z-axis motion mechanism is connected to the frame 2, and the X-axis motion mechanism is connected to the Z-axis motion mechanism;

[0054] The driving mechanism drives the transmission mechanism, which in turn drives the Y-axis motion mechanism to move horizontally in the Y-axis direction, drives the Z-axis motion mechanism to move vertically in the Z-axis direction, and drives the X-axis motion mechanism to move horizontally in the X-axis direction.

[0055] In embodiments of the present invention, the three-dimensional motion mechanism enables the object to move in three directions: the X-axis motion mechanism controls the object's movement in the X-axis direction, the Y-axis motion mechanism controls the object's movement in the Y-axis direction, and the Z-axis motion mechanism controls the object's movement in the Z-axis direction. The connection between the Z-axis motion mechanism and the frame 2 provides stable support for the Z-axis motion mechanism, ensuring its stability during movement and preventing accidental displacement or vibration from affecting the equipment. The connection between the Y-axis motion mechanism and the frame 2 enables the object to move horizontally, ensuring greater stability and reliability of the Y-axis motion mechanism during operation. The three-dimensional motion mechanism improves printing precision and accuracy. By controlling movement in three axes, it provides flexible operation and positioning capabilities, enabling precise control of the print head position, resulting in more accurate and refined printing results to meet diverse printing needs.

[0056] like Figures 1 to 3 As shown, the Y-axis motion mechanism includes two symmetrically arranged Y-axis sliding guides 5, which are horizontally arranged on the frame 2; the Z-axis motion mechanism includes two symmetrically arranged Z-axis sliding guides 6, which are vertically arranged on both sides of the frame 2; the X-axis motion mechanism includes an X-axis sliding guide 4, which is horizontally arranged at both ends on the Z-axis sliding guide 6, and a print head 71 is provided on the X-axis sliding guide 4.

[0057] In embodiments of the present invention, the three-dimensional motion mechanism is a key component of the 3D printing equipment, enabling precise motion control of the equipment along the X, Y, and Z axes. The Y-axis motion mechanism, through the horizontal arrangement and connection of the Y-axis sliding guide, allows for precise positioning and movement of the worktable in the Y-axis direction. The Z-axis motion mechanism, through the vertical arrangement and connection of the Z-axis sliding guide, allows for precise positioning and movement of the print head in the Z-axis direction, ensuring the vertical stability and accuracy of the print head during the printing process. The X-axis motion mechanism, through the horizontal arrangement and connection of the X-axis sliding guide, connects the print head to the Z-axis motion mechanism, enabling precise movement of the print head in the X-axis direction. Horizontal movement; through the combination of three-dimensional motion mechanisms, the print head can move flexibly in three directions, thereby achieving precise printing operations; the print head can move horizontally in a plane, move up and down in the vertical direction, and also move horizontally in the X-axis direction, enabling the print head to move flexibly in multiple directions, thus realizing the printing of complex shapes; the effect of the three-dimensional motion mechanism is to improve the precision and accuracy of printing. By controlling the movement in three axes, the position of the print head can be precisely controlled, resulting in more accurate and refined printing results, enabling the printing of more complex and diverse products to meet different printing needs.

[0058] like Figures 1 to 3 As shown, the Y-axis sliding guide rail 4 is slidably connected to the worktable 3 and connected to the bottom of the frame 2; damping springs 31 are provided at the four corners of the worktable 3.

[0059] In an embodiment of the present invention, the Y-axis sliding guide rail 4 is slidably connected to the worktable 3, and the first conveyor belt is connected to the bottom of the worktable 3. The movement of the conveyor belt can move the worktable 3 on the Y-axis sliding guide rail 4, enabling the 3D printing equipment to achieve precise control and adjustment in the Y-axis direction. The connection between the Y-axis sliding guide rail 4 and the bottom of the frame 2 fixes the position of the guide rail, ensuring stability during the printing process and avoiding the impact of accidental displacement or vibration on the printing quality. The damping spring 31 can reduce the impact of external vibration on the worktable 3. The damping spring 31 can reduce the vibration and swaying of the worktable 3, improve the stability and smoothness of the worktable 3, and ensure that the worktable 3 is more stable and reliable during operation.

[0060] like Figures 1 to 3 As shown, the transmission mechanism includes a first conveyor belt 51, a first drive shaft 52, and a first driven shaft 53;

[0061] The first driven shaft 53 is connected to the inner surface of the bottom of the frame 2, and the first driving shaft 52 is connected to the output end of the first motor 81;

[0062] The first conveyor belt 51 is connected to the bottom of the workbench 3 and is connected to the first drive shaft 52 and the first driven shaft 53.

[0063] In an embodiment of the present invention, the transmission mechanism transmits the power of the first motor 81 to the worktable 3. The first motor transmits power to the first conveyor belt and the first driven shaft through the first drive shaft, thereby enabling the worktable to move precisely in the Y-axis direction. The first drive shaft drives the conveyor belt, transmits power to the conveyor belt, drives the movement of the conveyor belt, and can adjust the speed and direction of the conveyor belt as needed. The first driven shaft 53 connects to and supports the conveyor belt. The first driven shaft 53 is connected to the inner surface of the bottom of the frame 2, providing support for the movement of the first conveyor belt, effectively transmitting power and the axis of movement, and ensuring the normal operation of the conveyor belt. The first conveyor belt 51 is connected to the bottom of the worktable 3, and the movement of the conveyor belt can move the worktable 3 on the Y-axis sliding guide rail 4, enabling the 3D printing equipment to achieve fine control and adjustment in the Y-axis direction, making the power transmission more stable and efficient.

[0064] like Figures 1 to 3As shown, the transmission mechanism further includes a second drive shaft 61, a third drive shaft 64, a second driven shaft 62, a third driven shaft 63, a fourth driven shaft 65, and a fifth driven shaft 66 disposed on the frame 2;

[0065] The sixth driven shaft 41 and the seventh driven shaft 42 are mounted on the X-axis sliding guide rail 4;

[0066] The second drive shaft 61 is connected to the output end of the second motor 82, and the third drive shaft 64 is connected to the output end of the third motor 83.

[0067] The transmission mechanism also includes a second conveyor belt 43 and a third conveyor belt 44;

[0068] One end of the second conveyor belt 43 is connected to the outer surface of the print head 71, and passes through the sixth driven shaft 41, the third driven shaft 63, the second driven shaft 62, the second drive shaft 61 and the seventh driven shaft 42 in sequence to connect to the other side of the outer surface of the print head 71;

[0069] One end of the third conveyor belt 44 is connected to the outer surface of the print head 71, and passes through the seventh driven shaft 42, the fifth driven shaft 66, the fourth driven shaft 65, the third drive shaft 64 and the sixth driven shaft 41 in sequence to connect to the other side of the outer surface of the print head 71.

[0070] In embodiments of the present invention, the transmission mechanism enables the object to move in both horizontal and vertical directions; the second and third motors, as the drive sources of the active shaft, transmit power to the conveyor belt and driven shaft through their respective active shafts. When the conveyor belt rotates, it can move the print head to the corresponding position; by controlling the motors, multi-dimensional motion control of the object can be achieved, which can improve the flexibility and accuracy of the print head, thereby achieving accurate positioning and movement effects; when the second motor 82 moves, it outputs power to the second active shaft 61, thereby driving the second conveyor belt 43 to move. One end of the second conveyor belt 43 passes sequentially through the second driven shaft 62 and... The third driven shaft 63 drives its movement. The second conveyor belt 43 then passes through the inner wheel of the sixth driven shaft 41 and connects to the print head. The other end of the second conveyor belt 43 passes through the inner wheel of the seventh driven shaft 42 and connects to the print head. When the second motor 82 moves clockwise, the second conveyor belt 43 drives the print head to move to the left in the X-axis direction. When the second motor 82 moves counterclockwise, the second conveyor belt 43 drives the print head to move to the right in the X-axis direction. When the third motor 83 moves, it outputs power to the third drive shaft 64, thereby driving the third conveyor belt 44 to move. One end of the third conveyor belt 44 passes through the fourth driven shaft 65 and the fifth driven shaft 66 in sequence. The third conveyor belt 44 passes through the outer wheel of the seventh driven shaft 42 and connects to the print head. The other end of the third conveyor belt 44 passes through the outer wheel of the sixth driven shaft 41 and connects to the print head. When the third motor 83 moves clockwise, the third conveyor belt 44 drives the print head to move to the left in the X-axis direction. When the third motor 83 moves counterclockwise, the third conveyor belt 44 drives the print head to move to the right in the X-axis direction. When the second and third motors rotate clockwise at the same time, the print head moves to the left in the X-axis direction. When the second and third motors rotate counterclockwise at the same time, the print head moves to the right in the X-axis direction. When the second motor rotates clockwise and the third motor rotates counterclockwise, the print head moves downwards along the Z-axis; when the second motor rotates counterclockwise and the third motor rotates clockwise, the print head moves upwards along the Z-axis. The movement of each axis can be controlled by controlling the motors, achieving accurate positioning of the print head and thus enabling precise 3D printing. The conveyor belt is elastic, reducing impact and vibration loads, ensuring smooth and noiseless operation. In case of overload, the conveyor belt will slip on the conveyor shaft, preventing damage to other components. The conveyor belt is low-cost, requires no lubrication, and is easy to maintain, thus extending the equipment's lifespan.

[0071] like Figures 1 to 3 As shown, a control panel 72 is provided on the upper part of the frame 2; a circuit component 73 is provided on the side of the frame 2 near the third motor 83; a host 74 is provided on the side of the frame 2 near the second motor 82; and a power interface 75 and a power switch 76 are provided on the outer surface of the frame 2.

[0072] In an embodiment of the present invention, the control panel 72 provides control and adjustment of the 3D printing equipment, including buttons, switches, and a display screen, for users to set and control the equipment; the circuit components 73 include electronic components, circuit boards, and connecting wires, used to control and adjust the operation of the 3D printing equipment; the host 74 is responsible for processing the control logic of the equipment, receiving input commands and executing corresponding operations, and communicating and coordinating with the control panel, motors, and other components to ensure the normal operation of the equipment; the power interface 75 and the power switch 76 provide power supply and switching control.

[0073] When the 3D printing equipment is working, it needs to be connected to a power source and the power switch turned on. Through the cooperation of the control panel, circuit components, and the main unit, users can easily configure and adjust the equipment to achieve precise motion control. By controlling the first motor, the worktable can be moved along the Y-axis. When the second and third motors rotate clockwise simultaneously, the print head moves to the left along the X-axis; when the second and third motors rotate counterclockwise simultaneously, the print head moves to the right along the X-axis; when the second motor rotates clockwise and the third motor rotates counterclockwise, the print head moves downward along the Z-axis; when the second motor rotates counterclockwise and the third motor rotates clockwise, the print head moves upward along the Z-axis. By controlling the movement of the motors, the movement of each axis mechanism can be controlled, achieving accurate positioning of the print head and thus enabling precise 3D printing.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 3D printing device, characterized in that: include: Base (1); The frame (2) is mounted on the base (1); A workbench (3) is set on the frame (2); A three-dimensional motion mechanism is mounted on the frame (2); A drive mechanism is mounted on the frame (2); A transmission mechanism is mounted on the frame (2) and connected to the three-dimensional motion mechanism and the drive mechanism; The three-dimensional motion mechanism includes an X-axis motion mechanism, a Y-axis motion mechanism, and a Z-axis motion mechanism; The Y-axis motion mechanism is connected to the frame (2), the Z-axis motion mechanism is connected to the frame (2), and the X-axis motion mechanism is connected to the Z-axis motion mechanism; The driving mechanism drives the transmission mechanism, the transmission mechanism drives the Y-axis motion mechanism to move horizontally in the Y-axis direction, the transmission mechanism drives the Z-axis motion mechanism to move vertically in the Z-axis direction, and the transmission mechanism drives the X-axis motion mechanism to move horizontally in the X-axis direction; The Y-axis motion mechanism includes two symmetrically arranged Y-axis sliding guides (5), which are horizontally arranged on the frame (2); The Z-axis motion mechanism includes two symmetrically arranged Z-axis sliding guides (6), which are vertically arranged on both sides of the frame (2); The X-axis motion mechanism includes an X-axis sliding guide rail (4), with both ends of the X-axis sliding guide rail (4) horizontally arranged on the Z-axis sliding guide rail (6), and a print head (71) is provided on the X-axis sliding guide rail (4). The transmission mechanism includes a first conveyor belt (51), a first drive shaft (52), and a first driven shaft (53). The first driven shaft (53) is connected to the inner surface of the bottom of the frame (2), and the first driving shaft (52) is connected to the output end of the first motor (81); The first conveyor belt (51) is connected to the bottom of the workbench (3) and is connected to the first drive shaft (52) and the first driven shaft (53); The transmission mechanism further includes a second drive shaft (61), a third drive shaft (64), a second driven shaft (62), a third driven shaft (63), a fourth driven shaft (65), and a fifth driven shaft (66) disposed on the frame (2). The sixth driven shaft (41) and the seventh driven shaft (42) are mounted on the X-axis sliding guide rail (4); The second drive shaft (61) is connected to the output end of the second motor (82), and the third drive shaft (64) is connected to the output end of the third motor (83); The transmission mechanism also includes a second conveyor belt (43) and a third conveyor belt (44). One end of the second conveyor belt (43) is connected to the outer surface of the print head (71), and passes through the sixth driven shaft (41), the third driven shaft (63), the second driven shaft (62), the second drive shaft (61) and the seventh driven shaft (42) in sequence to connect to the other side of the outer surface of the print head (71); One end of the third conveyor belt (44) is connected to the outer surface of the print head (71), and passes through the seventh driven shaft (42), the fifth driven shaft (66), the fourth driven shaft (65), the third drive shaft (64) and the sixth driven shaft (41) in sequence to connect to the other side of the outer surface of the print head (71).

2. The 3D printing equipment according to claim 1, characterized in that: The Y-axis sliding guide rail (5) is slidably connected to the worktable (3) and connected to the bottom of the frame (2); the worktable (3) is provided with damping springs (31) at the four corners.

3. The 3D printing equipment according to claim 1, characterized in that: A control panel (72) is provided on the upper part of the frame (2); a circuit component (73) is provided on the side of the frame (2) near the third motor (83).

4. The 3D printing equipment according to claim 3, characterized in that: The frame (2) has a host (74) on the side near the second motor (82).

5. The 3D printing equipment according to claim 4, characterized in that: The outer surface of the frame (2) is provided with a power interface (75) and a power switch (76).

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