Hidden gravity turnover desk calendar

Abstract

The invention discloses a hidden gravity turnover desk calendar which comprises a base, a rotating column is rotatably mounted on the base, and a rotating shaft of the rotating column is rotatably mounted in the base; each inner side wall of the rotating column is provided with a containing bin used for containing a plurality of cards, and the three containing bins are arranged around the rotating shaft in a circular array mode. A partition block is fixed to the center of the interior of the containing bin and divides the containing bin into a first bin and a second bin which can independently contain cards in the length direction, gaps are formed between the two ends of the partition block and the two inner walls of the containing bin in the length direction, and only one card can slide through the gaps. The card on the rightmost side in the second bin can slide into the reserved insertion space due to the dead weight in the process that the right side face of the rotating column rotates to pass through the vertical position so as to cover the previous displayed card. The turnover calendar provided by the invention is durable, and meets the requirements of user culture experience, multi-element scene use and the like.

Description

Technical Field

[0001] This invention relates to the field of calendar technology, and more specifically to a hidden gravity-flipping desk calendar. Background Technology

[0002] In today's era of integrating cultural creativity with everyday consumer goods, calendars, as products that combine practicality and cultural significance, are experiencing diversified market demand. Consumers are not only concerned with the basic function of date display but also seek cultural connotations, functional integration, and personalized experiences. However, existing calendar products have significant shortcomings: traditional paper calendars are limited in function, focusing solely on date recording and failing to integrate into the diverse scenarios of modern life; while ordinary electronic calendars achieve digital display, they lack cultural warmth and the fun of hands-on interaction; most calendars suffer from severe homogenization in structural design, lacking innovative forms and having low functional integration, failing to meet users' complex needs for cultural display, storage, and intelligent linkage. Against this backdrop, the development of calendar products that integrate cultural creativity, innovative structure, and multifunctional integration is of practical significance. The calendar product of this patent application aims to break through tradition, adapting to modern consumer needs with innovative structure and diverse functions, and inheriting and showcasing regional culture.

[0003] Material and structural defects further constrain product lifecycles. Paper calendars are physically susceptible to moisture and damage, while electronic calendars, though more durable, suffer from a disconnect due to the lack of physical interaction, resulting in a "cold" experience. A deeper contradiction lies in the mismatch between material selection and functional goals: low-cost paper calendars meet one-time consumption needs but sacrifice durability and reusability, while electronic dates strip away the ritualistic feeling of time. Crucially, the traditional integrated packaging design turns the product into a "disposable consumable," preventing users from upgrading components as needed and leading to resource waste.

[0004] Another significant bottleneck is the lack of functional simplification. Existing technologies focus on basic date display and neglect the need for scenario-based extensions. This limitation stems from the lack of modular design—non-replaceable components result in zero functional expandability and significantly increase maintenance complexity. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies mentioned in the background section by proposing a hidden gravity-flipping calendar to solve the problems of traditional calendars failing to meet users' combined needs for cultural display, storage, and intelligent linkage, as well as their low durability and tendency to become "disposable annual consumables."

[0006] To address the aforementioned technical problems, the present invention specifically provides the following technical solution:

[0007] This invention provides a hidden gravity-flipping desk calendar, comprising a base on which rotating columns are rotatably mounted. Each rotating column is a hollow, shell-like structure, and a rotating shaft is vertically fixed to its end face, the shaft being rotatably mounted within the base. Each inner wall of the rotating column has a compartment for holding several cards, and the three compartments are arranged in a circular array around the rotating shaft. A partition is fixed at the center of each compartment, dividing it along its length into a first compartment and a second compartment, each capable of independently holding the cards. Gaps exist between the two ends of the partition and the two inner walls of the compartment along its length, allowing only a small amount of space to pass through. A card slides through, allowing it to circulate between the first and second compartments. When one side of the rotating column rotates to a horizontal position, the bottom of the compartment on the right becomes the second compartment. The side wall of the second compartment near the bottom has a window through which the card currently displayed inside can be seen. There is a reserved space between the card displayed in the second compartment on the right and the window, which can only accommodate one type of card. When the rotating column rotates clockwise, the rightmost card in the second compartment can slide into the reserved space due to its own weight as the right side of the rotating column rotates through the vertical position, thus covering the previously displayed card.

[0008] Furthermore, the rotating column is a positive rotating column, the rotating shaft is located at the center of the rotating column, and the second compartment of the receiving chamber is located near the corner.

[0009] Furthermore, the containment chamber is enclosed by a [-shaped inner cover and the inner wall of the rotating column, and the window is rectangular.

[0010] Furthermore, the lengths of the first and second compartments must be such that the cards can have a certain amount of movement along the corresponding tilt direction of the rotating column.

[0011] Furthermore, when the card is in the displayed position inside the window, the bottom end of the card near the bottom of the inner cover can slide through the gap and come into contact with the card opposite in the second compartment.

[0012] Furthermore, the partition is a rectangular structure with its length direction perpendicular to the side of the rotating column; all edges of the partition and the card are chamfered; each side of the rotating column is also provided with a decorative panel, which is positioned above the window when the card is displayed through the window.

[0013] Furthermore, the length of the spacer can be adjusted in a direction perpendicular to the side of the rotating column to change the size of the gap, ensuring that the card can slide freely through the corresponding gap.

[0014] Furthermore, the partition includes a drive shaft and a worm gear fixed on the drive shaft, as well as an inner block and thin-walled sliding covers at both ends of the inner block. The inner block is hollow inside, and a worm is rotatably installed on one side inside. Z-shaped curved rods are threaded to both ends of the worm. After passing through the inner block, the curved rods are fixed to the inner wall of the thin-walled sliding covers, and the curved rods slide in the inner block where they pass through, so that when the drive shaft rotates, the two curved rods carry the two thin-walled sliding covers to move in opposite directions.

[0015] Furthermore, the partition includes a drive shaft and a drive gear fixed on the drive shaft, as well as an inner block and sliding plates respectively slidably mounted on both sides of the inner block. The interior of the inner block is hollow, and racks are fixed on the opposite sides of the two sliding plates. The racks are slidably mounted in straight holes on the sidewalls of the inner block and mesh with the drive gears, so that when the drive shaft rotates, the two racks carry the two sliding plates to move in opposite directions.

[0016] Furthermore, a drive gear is fixed at one end of the drive shaft outside the receiving chamber. All drive gears mesh with the outside of a central gear ring. The central gear ring is coaxially and rotatably mounted on the end face of the rotating column via a concentric shaft sleeve. The end of the concentric shaft sleeve has a protruding tooth. The protruding tooth is directly opposite several arc-shaped slots on the side wall of the base. Adjacent arc-shaped slots are separated by connecting ribs so that the protruding tooth can be inserted into the arc-shaped slots to rotate the central gear ring. A locking cap is threaded into the end of the protruding tooth to fix the protruding tooth on the side of the base.

[0017] A central gear is coaxially arranged on the inner side of the central gear ring. The central gear is fixed on the rotating shaft. The central gear meshes with an input gear driven by a micro motor. The input gear is located in the gap between the side wall of the base and the end face of the rotating column.

[0018] Compared to current technologies in the field, this invention offers a series of advantages: The hidden gravity-flipping calendar of this invention consists of several independent triangular prism-shaped rotating pillars. Through the coordinated rotation of the partitioned storage compartments, cards, and rotating bodies, a hidden gravity-driven structure is formed, enabling sequential date updates. Date changes can be completed solely through gravity and a precise gap design. The card-style date display stand used is more durable and reusable than traditional paper calendars, and also boasts a more aesthetically pleasing design.

[0019] Based on the above design, this invention, supplemented by a modular interface design, precisely controls the timing of flipping and includes decorative panels formed by cultural display boards, perfectly embodying cultural symbols over time. Existing manufacturing processes such as 3D printing can be used for both the cards and decorative panels, effectively injecting complex artistic effects that are difficult to achieve with traditional printing around calendar numbers. Attached Figure Description

[0020] To more clearly illustrate the core technical solution of the present invention, at least one embodiment based on the core concept of the present invention will be briefly introduced below, supplemented by structural principle diagrams required in relevant prior art when necessary. Of course, the following figures are only some feasible embodiments of the concept of the present invention. For those skilled in the art, without additional creative effort, they can also expand some possible adaptive technical designs based on these figures.

[0021] Figure 1 This is a perspective view of the concealed gravity-flipping calendar of the present invention;

[0022] Figure 2 This is a front view of the hidden gravity-flipping calendar of the present invention;

[0023] Figure 3 yes Figure 2 AA section view in the middle;

[0024] Figures 4-9 These are schematic diagrams illustrating several states during the process of the hidden gravity-flipping calendar rotating clockwise once.

[0025] Figure 10 This is a schematic diagram of the first type of structure with adjustable length for the partition;

[0026] Figure 11 This is a schematic diagram of the second structure with adjustable length for the spacer;

[0027] Figure 12 This is a schematic diagram of a synchronous transmission structure for the various transmission shafts inside a rotating column;

[0028] Figure 13 This is a top view of the central gear ring in this invention;

[0029] Figure 14 yes Figure 13 BB section view in the middle.

[0030] Explanation of reference numerals in the attached drawings: Base 1, Arc-shaped slot 101, Connecting rib 102, Rotating column 2, Card in display 3, Storage compartment 4, First compartment 401, Second compartment 402, Gap 403, Reserved insertion space 404, Window 5, Partition 6, Inner block 601, Thin-walled sliding cover 602, Rotating shaft 7, Decorative panel 8, Central gear 9, Drive shaft 10, Worm 11, Crank 12, Worm wheel 13, Transmission gear 14, Slide plate 15, Sliding column 16, Rack 17, Drive gear 18, Input gear 19, Inner cover 20, Central gear ring 21, Concentric shaft sleeve 2101, Protruding tooth 22, Locking cap 23, Seat sleeve 24. Detailed Implementation

[0031] To make the creative features and technical means of this invention more clearly understood, the relevant technical solutions of this invention will be discussed in detail below. Those skilled in the art should understand that all the embodiments described below are solutions, and only some feasible or recommended implementation structures or methods of this invention, not all embodiments embodied in this invention.

[0032] See for those skilled in the art Figures 1-3 As shown, this embodiment discloses a hidden gravity-flipping desk calendar, which includes a base 1. The base 1 is integrally injection molded from ABS plastic and has isosceles trapezoidal plate structures on both sides. A circular mounting hole is opened near the upper center of the plate for mounting a rotating shaft 7. Specifically, one or more rotating columns 2 are rotatably mounted on the base 1. The rotating column 2 is a hollow shell structure and can be made of plastic. A rotating shaft 7 is vertically fixed at the center of the end face of the rotating column 2. The two ends of the rotating shaft 7 are rotatably mounted in the circular mounting holes on both sides of the top of the base 1 through bearings, so that the rotating column 2 can rotate freely on the base 1 with the rotating shaft 7. On each of the three inner side walls of the rotating column 2, there is a compartment 4 for accommodating several cards, such as... Figure 3 As shown, this storage compartment 4 can hold 5 cards. The cards are made of materials such as plastic, metal, and some new composite materials, making them corrosion-resistant and durable. They are printed with information such as dates, holidays, and certain unique cultural symbols. The three storage compartments 4 are arranged in a uniform circular array around the rotating axis 7, with an included angle of 120° between any two adjacent storage compartments 4. In addition, a partition 6 must be fixed in the center of the interior of the storage compartment 4. The partition 6 divides the storage compartment 4 into a first compartment 401 and a second compartment 402 along the inclined length of the side of the rotating column 2. Both the first compartment 401 and the second compartment 402 can independently hold cards, and the two ends of the partition 6 are reserved with the two inner walls of the storage compartment 4 along its length. Figure 3 The gap 403 shown, for example, is set to a width of 1.2 mm according to the card thickness, allowing only a card with a thickness of 1 mm to slide through, thereby enabling the flow of cards between the first compartment 401 and the second compartment 402. As an example design for use, when the rotating column 2 rotates about the rotating shaft 7 to... Figure 3When one side of the display is horizontal, the bottom of the right-hand compartment 4 is the second compartment 402. A window 5 is provided on the side wall of this second compartment 402 near the bottom. The size of this window 5 matches the display surface size of a single card, allowing a clear view of the card 3 currently displayed inside the second compartment 402. Simultaneously, a 1.2mm wide slot 404 is reserved between the displayed card in the right-hand compartment 402 and the window 5, allowing only one type of card to slide in at a time. When the rotating column 2 rotates clockwise, the rightmost card in the second compartment 402 will, as the right side of the rotating column 2 passes through the vertical position, ... Figure 4 As shown, under its own gravity, it slides along the inner wall of the second compartment 402 into the reserved insertion space 404, thereby covering the previously displayed card and completing the pre-position switch of the next card display content. The entire switching process is as follows: Figures 3-9 As shown.

[0033] This embodiment of the hidden gravity-flipping calendar further optimizes the structural design by setting the rotating column 2 as a regular triangular prism with three rectangular sides of the same size. The rotating axis 7 is located at the geometric center of the rotating column 2, ensuring that the movement of the cards in the three compartments 4 remains highly consistent when the rotating column 2 rotates around the axis 7. This also makes the force on the three sides more even and the rotation process smoother. To facilitate the relative sliding of the cards, the second compartment 402 of the compartment 4 is located near the corner of the rotating column 2. This corner is rounded, allowing the cards to slide more smoothly towards the window 5 or other corresponding positions under gravity, improving the reliability of card switching.

[0034] In this embodiment, as Figure 3 As shown, its receiving compartment 4 is formed by an inner cover 20 and the inner wall of the rotating column 2. The inner cover 20 and the inner wall of the rotating column 2 can be integrally formed, with the opening of the inner cover 20 facing the inner wall of the rotating column 2. A closed receiving space is formed between the inner cover 20 and the inner wall of the rotating column 2 for placing cards. In practice, a rotating column 2 can adopt a two-half assembly structure for easy disassembly, installation, and card placement. During manufacturing, the window 5 can be set as a rectangular structure with chamfered edges, allowing the rectangular window 5 to better fit the display surface of regular cards and ensure the integrity of the display effect.

[0035] As an example of local design parameters for a hidden gravity-flipping calendar, the dimensional relationship between the first compartment 401 and the second compartment 402 is further defined. For example, the length of both the first compartment 401 and the second compartment 402 is set to 4cm, while the length of the card is 3.5cm. This makes the length of the first compartment 401 and the second compartment 402 0.5cm longer than the length of the card. This dimensional design ensures that after the card is placed in the first compartment 401 or the second compartment 402, it can have a 0.5cm movement along the corresponding side tilt direction of the rotating column 2. This movement can prevent the card from getting stuck due to the size fitting being too tight, ensuring the flexibility of the card sliding in the compartment and facilitating the smooth flow of the card between the first compartment 401 and the second compartment 402.

[0036] As one of the specific design structures, the relationship between the card and the storage unit can be such that when the card is in the display position inside window 5, that is... Figure 3 When positioned as shown, the bottom end of the card near the bottom of the inner cover 20 can smoothly slide through the gap 403 between the partition 6 and the inner wall of the receiving compartment 4, and the bottom end of the card will abut against the top end of another card placed opposite in the second compartment 402. Through this abutting engagement, the cards in the second compartment 402 can be positioned to prevent them from shaking randomly during the rotation of the rotating column 2. At the same time, when a card in the display position is covered by a new card, the abutting force can help the old card slide smoothly away from the display position, ensuring that the card switching process is carried out in an orderly manner.

[0037] In this embodiment, as Figure 3 As shown, in its specific manufacturing process, the partition 6 adopts a rectangular structure, with its length direction perpendicular to the side of the rotating column 2. The size of the rectangular partition 6 is adapted to the internal width of the receiving compartment 4, ensuring stable separation of the first compartment 401 and the second compartment 402, and allowing a single card to slide smoothly through the corresponding gap 403. In practice, the four edges of the partition 6 and the four edges of the card are all chamfered, with a chamfer radius of 0.5mm or 1mm, facilitating the sliding insertion between cards and effectively preventing sharp edges from scratching the user and the card, thus improving product safety and user comfort. Each side of the rotating column 2 has a decorative panel 8 on its outer side. The decorative panel 8 can be an embossed plate or some 3D printed cultural and creative cards, etc., to enhance the aesthetics of the product. When the card is displayed through the window 5, the decorative panel 8 is positioned above the window 5, which can serve as a decorative shield for the structure above the window 5, while also preventing dust from entering the receiving compartment 4 from above the window 5.

[0038] As one of the exemplary manufacturing and application methods, decorative panel 8 can meet the needs of high-precision reproduction of cultural symbols. The solution adopts a graded printing strategy of photopolymerization (SLA) and fused deposition modeling (FDM). Decorative panel 8 is an architectural relief display board (such as the texture of the Temple of Heaven), which is realized by photopolymerization 3D printing: First, a layer thickness parameter of 0.05mm is preset in the three-dimensional model. Then, the liquid photosensitive resin (the material is reddish-brown resin with a Shore hardness of 75±2) is scanned layer by layer with a UV laser. After curing, it is cleaned with isopropyl alcohol and subjected to secondary curing treatment to finally obtain a relief component with an accuracy of ±0.1mm. This process ensures the clarity of complex architectural textures and improves the yield rate by 40% compared with traditional carving.

[0039] The main structure of the calendar (rotating column 2 and base 1) adopts FDM process: maple-colored PLA material is extruded at high temperature and then stacked layer by layer to form the shape. The strength of key stress parts (such as the interface of the rotating shaft 7) is improved by increasing the filling density to 80% (bending strength reaches 35-40MPa). After completion, the burrs are removed by precision sanding to ensure the smoothness of mechanical moving parts. The graded manufacturing strategy reduces the overall cost by 60% while meeting the strength requirements of a 10-year service life.

[0040] As one of the preferred design options, the partition 6 can be adjusted in length along a direction perpendicular to the side of the rotating column 2. For example, when the partition 6 is rectangular, its length can be changed along its length direction, thereby changing the size of the gap 403. This allows for flexible adjustment of the minute gap 403 during assembly or use, adapting to each manufactured flip calendar. Specifically, the partition 6 adopts a telescopic structure, for example, its length adjustment range is 0-1cm. By adjusting the overall length of the partition 6, the size of the gap 403 between the two ends of the partition 6 and the inner wall of the receiving compartment 4 can be changed. In addition to the reasons mentioned above, this design also improves versatility, allowing it to accommodate cards of different thicknesses. This ensures that cards of different thicknesses can slide freely through the corresponding gap 403, improving the product's versatility and adaptability. Users can replace cards of different thicknesses according to their needs without replacing the entire device.

[0041] This embodiment provides a specific telescopic structure for the spacer 6, such as... Figure 10 As shown, the partition 6 includes a drive shaft 10, a worm gear 13, an inner block 601, and a thin-walled sliding cover 602. The drive shaft 10 is made of metal. The inner block 601 has a hollow structure, with the drive shaft 10 penetrating through the center of the inner block 601. The worm gear 13 is fixedly sleeved in the middle of the drive shaft 10, meaning the worm gear 13 is located inside the inner block 601. A worm 11 is rotatably mounted on one side of the inner block 601 via a bearing. The worm 11 meshes with the worm gear 13. Both ends of the worm 11 are connected to a Z-shaped curved rod 12 via threaded connections. Figure 10As shown, one end of the crank 12 passes through the wall of the inner block 601 and is fixedly connected to the inner wall of the thin-walled sliding cover 602. The thin-walled sliding cover 602 slidably covers both ends of the inner block 601. The part that slides in contact with the side of the inner block 601 has a very small wall thickness, for example, it is made of stainless steel with a thickness of only 0.3 mm or even thinner, which takes into account both the performance of very small thickness and high strength, so as to minimize the resistance of the card moving at its surface joint. In addition, the part where the crank 12 passes through the inner block 601 and the side wall of the inner block 601 adopts a sliding fit, and space is reserved between the two to accommodate the movement of the crank 12. When the drive shaft 10 is rotated, the drive shaft 10 will drive the worm wheel 13 to rotate synchronously. The worm wheel 13 drives the worm 11 to rotate. The worm 11 drives the cranks 12 at both ends to move in the horizontal direction through the thread transmission. Since the threads at both ends of the worm 11 rotate in opposite directions, the two cranks 12 will cause the two thin-walled sliding covers 602 to move in opposite directions, thereby realizing the adjustment of the overall length of the spacer 6 and achieving the purpose of changing the size of the gap 403.

[0042] In addition to the above-described implementation structure, another specific telescopic structure for the spacer 6 is provided, such as... Figure 11 As shown, the partition 6 includes a drive shaft 10, a drive gear 14, an inner block 601, and a sliding plate 15. Similar to the previous embodiment, it contains an inner block 601 and a drive shaft 10, but the structures of the other components are different. Specifically, a drive gear 14 is used instead of a worm gear 13; that is, the drive gear 14 is fixedly sleeved on the drive shaft 10 and located inside the inner block 601. The inner block 601 is also hollow, but two sliding plates 15 on its two sides are slidably mounted on the two side surfaces of the inner block 601. The sliding plates 15 are the bearing surfaces for the card to slide on. The sliding plates 15 are preferably designed to be thin. A slider engagement structure is used between the sliding plates 15 and the side wall of the inner block 601 to ensure that the sliding plates 15 can slide smoothly along the side wall of the inner block 601. Each of the two sliding plates 15 has a rack 17 fixed to one side of its opposite side via a sliding post 16. The length of the rack 17 is perpendicular to the axis of the drive shaft 10. Straight holes adapted to the sliding posts 16 are provided on both sides of the inner block 601. The rack 17 passes through the straight holes and extends into the interior of the inner block 601, meshing with the drive gear 14. When the drive shaft 10 is rotated, it drives the drive gear 14 to rotate synchronously. The drive gear 14 drives the racks 17 on both sides to move in opposite directions. The racks 17 drive the corresponding sliding plates 15 to slide on the side walls of the inner block 601, thereby adjusting the overall length of the partition 6. In essence, this adjusts the length of the sliding support surface between the partition 6 and the card, thus changing the size of the gap 403 between the two ends of the partition 6 and the inner wall of the receiving compartment 4.

[0043] The above two implementation methods achieve flexible adjustment of the corresponding gap 403 by changing the distance between the end of the thin-walled sliding cover 602 or the end of the sliding plate 15 and the inner sidewall of the receiving chamber 4. To achieve the adjustment of the dimensions of the two partition blocks 6, or in other words, to adjust the gap 403, as follows... Figure 12 A drive gear 18 is fixed at one end of the drive shaft 10 outside the receiving chamber 4. Each of the three drive shafts 10 corresponding to the three receiving chambers 4 is equipped with this drive gear 18. All three drive gears 18 mesh with the outer side of a central gear ring 21, forming a planetary gear transmission structure. The structure of this central gear ring 21 is as follows: Figures 13-14 As shown, there is an integrally formed concentric bushing 2101, which is rotatably mounted in an annular seat 24. The seat 24 can be integrally formed with the rotating column 2. The specific setting position is adaptably designed, as long as the concentric bushing 2101 can be rotatably located on the end face of the rotating column 2. The end face of the concentric bushing 2101 also has an integrally formed tooth 22, which is directly opposite the arc-shaped slot 101 on the side wall of the base 1. There are multiple arc-shaped slots 101, which are separated from each other by connecting ribs 102. A stud can also be machined at the end of the protruding tooth 22. Moving the stud moves the protruding tooth 22, allowing the central gear ring 21 to rotate on the end face of the rotating column 2, thereby driving all the transmission shafts 10 to rotate synchronously and adjusting the aforementioned gap 403. After adjustment, tighten the locking cap 23, pressing it firmly against the end face of the seat sleeve 24, thus fixing the protruding tooth 22 and the central gear ring 21 to the rotating column 2 as one unit. Specifically, an Allen wrench can be inserted into the arc-shaped slot 101 and inserted into the groove at the end of the locking cap 23. Then, the locking cap 23 can be rotated, and the central gear ring 21 can be rotated to the corresponding position by the locking cap 23, and then tightened again to fix it. Based on the above structural design, a central gear 9 can also be coaxially mounted within the central gear ring 21. This central gear 9 is fixed to the rotating shaft 7 and meshes with an input gear 19. The input gear 19 is driven by a micro motor, which is fixedly mounted on the outside of the base 1 or in another location. A servo motor with low-speed pulse input is recommended. This control mode requires only two inputs: one for position pulse input and one for direction control (forward / reverse rotation). The input gear 19 is positioned in the gap between the side wall of the base 1 and the end face of the rotating column 2. When the micro motor starts, it drives the input gear 19 to rotate, which in turn drives the central gear 9 to rotate, thus achieving the timely rotation of the rotating column 2.

[0044] As an example of a specific control principle, the working principle of this flip calendar can be based on pulse equivalent conversion: the system is set to 5000 pulses for one rotation of the servo motor, while the motor rotation angle required for the triangular prism to flip 90° is calculated to be 1 / 4 rotation, corresponding to 1250 pulses. The microcontroller generates precise PWM pulses through a timer to control the motor rotation, and simultaneously captures the limit sensor signal through an external interrupt to confirm that the page has been turned.

[0045] The specific implementation steps are as follows:

[0046] Initialization Configuration: After the system powers on, the microcontroller initializes the TIM3 timer (PWM output), TIM2 timer (pulse counting), USART serial port, and GPIO interface. TIM3 is configured in PWM mode, with a pulse frequency of 50Hz (period 20ms), and the duty cycle is adjusted using the TIM_SetCompare3 function to output control pulses. TIM2 is configured in counting mode to record the number of output pulses.

[0047] Time monitoring: The microcontroller reads the DS3231 real-time clock module every 100ms. When it detects that the current time is 00:00:00, it triggers the page turning control process.

[0048] Page turning execution: The system first detects the current position of the triangular prism using a limit sensor to determine the rotation direction (DIRx pin outputs high / low level), then starts TIM3 to output PWM pulses and simultaneously starts TIM2 counting. When the TIM2 count value reaches 1250 (corresponding to a 90° flip), the PWM output is turned off, completing one page turning action.

[0049] Position confirmation: During page turning, a limit sensor (not shown in the figure) can be adaptively set to monitor the position of the triangular prism in real time. When a position signal is detected, the pulse output is stopped immediately to ensure accurate page turning position (error ≤ 0.5°).

[0050] Finally, it should be noted that in all the contents described in this invention, terms such as “comprising,” “including,” and other general statements are intended to cover non-exclusive inclusion techniques, such that the process, article, or method, or related apparatus of the corresponding element, means not only including these technical elements, but also the inherent features of a certain process, article, apparatus, or method.

[0051] As should be clearly understood by those skilled in the art, any person skilled in the art can make adaptive improvements or equivalent substitutions based on the above embodiments after fully understanding the technical principles of the present invention. Thus, these technical solutions that do not depart from the core technical concept of the present invention should all be included within the protection scope of the present invention.

Claims

1. A concealed gravity flip-top desk calendar comprising a base (1), characterised in that, The base (1) is provided with three prism-shaped rotating columns (2) which are rotatably mounted on the base (1), each rotating column (2) is a hollow shell structure, the end surface of the rotating column (2) is vertically fixed with a rotating shaft (7) which is rotatably mounted in the base (1); each inner side wall of the rotating column (2) is provided with a containing bin (4) for containing a plurality of cards, the three containing bins (4) are arranged in a circular array around the rotating shaft (7); The containing bin (4) is fixed with a partition block (6) at the inner central part, the partition block (6) divides the containing bin (4) into a first bin (401) and a second bin (402) which can independently contain the cards along the length direction, and the two ends of the partition block (6) are provided with gaps (403) between the two inner walls along the length direction of the containing bin (4), the gap (403) can only allow a card to slide through, so that the card flows between the first bin (401) and the second bin (402), when one side of the rotating column (2) is turned to be horizontal, the bottom of the containing bin (4) on the right side is the second bin (402), and the side wall near the bottom of the second bin (402) is provided with a window (5) for viewing the card displayed in the second bin (402) through the window (5); the card displayed in the second bin (402) on the right side is provided with a reserved gap (404) between the card and the window (5), the reserved gap (404) can only contain a card to slide in; When the rotating column (2) rotates clockwise, the rightmost card in the second bin (402) can slide into the reserved gap (404) due to gravity during the process of rotating the vertical position on the right side of the rotating column (2), so as to cover the previously displayed card.

2. A concealed gravity flip-top desk calendar according to claim 1, wherein, The rotating column (2) is a positive rotating column (2), the rotating shaft (7) is located at the center of the rotating column (2), and the second bin (402) of the containing bin (4) is arranged at the corner.

3. A concealed gravity flip calendar according to claim 1, wherein, The containing bin (4) is surrounded by an inner cover (20) of [type and the inner side wall of the rotating column (2), and the window (5) is rectangular.

4. A concealed gravity flip calendar according to claim 3, wherein, The lengths of the first bin (401) and the second bin (402) must be such that the card can slide in the inclined direction of the corresponding side of the rotating column (2) in the containing bin (4).

5. A gravity flip-over desk calendar according to claim 4, wherein, When the card is in the displayed position inside the window (5), the bottom end of the card near the bottom of the inner cover (20) can slide through the gap (403) and abut against the card in the second bin (402).

6. A concealed gravity inversion desk calendar according to claim 1 wherein, The partition block (6) is a rectangular structure with the length direction perpendicular to the side of the rotating column (2); the partition block (6) and the edges of the card are all chamfered; each side of the rotating column (2) is also provided with a veneer (8), and the veneer (8) is above the window (5) when the card is displayed through the window (5).

7. A gravity flip-over desk calendar according to claim 1, wherein, The length of the partition block (6) can be adjusted in the direction perpendicular to the side of the rotating column (2) to change the size of the gap (403) to ensure that the card can freely slide through the corresponding gap (403).

8. A concealed gravity inversion desk calendar according to claim 7, wherein, The partition (6) includes a drive shaft (10) and a worm gear (13) fixed on the drive shaft (10), as well as an inner block (601) and thin-walled sliding covers (602) that slide on both ends of the inner block (601). The inner block (601) is hollow inside, and a worm (11) is rotatably installed on one side inside. Both ends of the worm (11) are threaded with Z-shaped curved rods (12). The curved rods (12) pass through the inner block (601) and are fixed to the inner wall of the thin-walled sliding cover (602). The curved rods (12) slide with the inner block (601) where they pass through, so that when the drive shaft (10) rotates, the two curved rods (12) move in opposite directions with the two thin-walled sliding covers (602).

9. A gravity flip-over desk calendar according to claim 7, wherein, The partition (6) includes a drive shaft (10) and a drive gear (14) fixed on the drive shaft (10), as well as an inner block (601) and sliding plates (15) respectively slidably installed on both sides of the inner block (601). The inner block (601) is hollow inside. Each of the two sliding plates (15) has a rack (17) fixed on one side opposite to the other. The rack (17) is slidably installed in a straight hole on the side wall of the inner block (601) and meshes with the drive gear (14) so ​​that when the drive shaft (10) rotates, the two racks (17) carry the two sliding plates (15) to move in opposite directions.

10. A concealed gravity inversion desk calendar according to claim 8 or 9, wherein, The drive shaft (10) is fixed with a drive gear (18) at one end outside the receiving chamber (4). All drive gears (18) mesh with the outside of a central gear ring (21). The central gear ring (21) is coaxially and rotatably mounted on the end face of the rotating column (2) via a concentric shaft sleeve (2101). The end of the concentric shaft sleeve (2101) has a protruding tooth (22). The protruding tooth (22) is directly opposite to several arc-shaped slots (101) on the side wall of the base (1). Adjacent arc-shaped slots (101) are separated by connecting ribs (102) so that the protruding tooth (22) can be inserted into the arc-shaped slots (101) to rotate the central gear ring (21). The end of the protruding tooth (22) is threaded with a locking cap (23) to fix the protruding tooth (22) to the end of the annular seat sleeve (24) for rotatably mounting the concentric shaft sleeve (2101). A central gear (9) is coaxially provided on the inner side of the central gear ring (21). The central gear (9) is fixed on the rotating shaft (7). The central gear (9) meshes with an input gear (19) driven by a micro motor. The input gear (19) is located in the gap between the side wall of the base (1) and the end face of the rotating column (2).

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