A book cover folding device for children

Abstract

The utility model relates to children's book production equipment technical field, specifically disclose a children's book cover folding device, including the machine case, conveying mechanism, cover turn -up mechanism and cover push mechanism, through a series of synchronous meshing gear drive coaxial eccentric cam rotation in cover turn -up mechanism, in combination with the unique design that the convex part top arc length gradually increased along the cover conveying direction, make multiple lift push piece produce staggered, continuous undulating wave -like movement track. The design has realized to the cover free edge continuous, gradual, soft folding, greatly reduced the cover stress concentration and indentation risk. Subsequently, the flap of cover push mechanism through the instantaneous powerful folding action, will the cover free edge that preliminary turned up thoroughly fold and form the firm hinge state. The device has improved the fluency of folding process, the finished product quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of children's book production equipment, and in particular to a children's book cover folding device. Background Technology

[0002] The production of children's business cards involves key processes such as cover feeding, cover printing, book block mounting, cover folding, and flat pressing. Among these, cover folding is the core step of bending the cover, which is attached to the book block, along the center line to form a hinge. This process requires accurate alignment and simultaneous folding to ensure that the folded cover is flat, undamaged, and tightly bonded to the book block. The quality and efficiency of this process directly affect the quality and production capacity of the final product.

[0003] However, conventional cover-flipping mechanisms, such as those using cylinders to drive the flippers, still have significant inherent drawbacks. Since the book cover is flat before folding, and half of it is already glued to the book block, in practice, the book block must be firmly pressed down before the other half of the cover can be folded. The rigid and unbuffered action of traditional cylinder-driven flippers makes it easy for the mechanism or structure used to hold the book block to interfere with the flipper during the folding motion, hindering a smooth folding process. This can not only cause cover displacement, wrinkles, or even damage, but also significantly limits further increases in folding speed, hindering efficient continuous production.

[0004] To address the aforementioned issues, some improved solutions have emerged in the prior art, such as the cover-turning machine disclosed in Chinese Patent Publication No. CN216272134U. This design employs a combined structure including a front-page side-flipping component with a ramp and a linear pushing component: during transport, the cover is forcibly lifted almost vertically along the ramp, and then flattened against the book block by the pushing component. While this solution improves positioning accuracy to some extent, it still has shortcomings. Its method of forcibly lifting the cover along a fixed ramp places certain requirements on the cover's toughness and thickness, lacks precise control over the flipping process, and is prone to generating unnecessary excessive stress or minor indentations at the cover's bending points. More importantly, this one-time lifting method relying on the ramp structure means the flipping process is dominated by the relative sliding between the rigid ramp and the cover, resulting in relatively stiff movements and a lack of flexible buffering; uneven force on the cover may lead to slight displacement. Furthermore, the intermittent connection between the cover being lifted and paused on the ramp and then flattened by another mechanism makes it difficult to achieve highly continuous and smooth operation, limiting the improvement of overall production efficiency.

[0005] Therefore, the industry urgently needs a cover folding solution that allows for more precise and controllable folding processes, smoother action transitions, effective avoidance of structural interference, and suitability for high-speed continuous operation. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a children's book cover folding device to solve the above problems.

[0007] A children's book cover folding device includes:

[0008] Chassis;

[0009] A conveying mechanism, mounted on the chassis, for conveying the cover along the X direction, includes:

[0010] Two support frames arranged side by side along the Y direction with adjustable spacing;

[0011] A first guide rail extending along the X direction is disposed on one of the support frames;

[0012] A book-pushing component that is slidably mounted on the first guide rail and used to push the cover along the X direction;

[0013] A cover-flipping mechanism, disposed above the conveying mechanism and located at the starting position along the cover conveying direction, includes:

[0014] Gantry frame fixed to the support frame;

[0015] Multiple gears that are rotatably mounted inside the gantry frame via a rotating shaft and mesh sequentially;

[0016] An eccentric cam is fixed coaxially with each of the gears; each eccentric cam is provided with a single fan-shaped protrusion around its axis of rotation; the protrusion is composed of a circular arc top surface with a top arc length and guide inclined surfaces with the same arc and length connecting the two sides of the top surface;

[0017] A lifting push block that can be raised and lowered above the gantry frame;

[0018] A limiting post fixed below the lifting push block and periodically rolling against the protrusion of the eccentric cam;

[0019] A reset spring is installed inside the gantry frame and is used to drive the lifting push block to return to its downward position.

[0020] A drive motor fixed on the chassis and used to drive any one of the rotating shafts; wherein, the top arc length of the protrusions of each eccentric cam arranged sequentially along the cover conveying direction increases sequentially.

[0021] A cover-pushing mechanism, disposed after the cover-flipping mechanism along the cover conveying direction, includes:

[0022] A flap that is rotatably mounted on the support frame via a pivot;

[0023] A pushing device fixed to the support frame and used to push one end of the flip plate upward to make it rotate around a pivot; the flip plate is used to receive the cover initially flipped up by the cover flipping mechanism and flip it into a hinged state.

[0024] Specifically, the book-pushing assembly includes a sliding seat, a stop block rotatably disposed on the sliding seat, and a cylinder disposed on the sliding seat and used to drive the blocking portion of the stop block upward beyond the upper end face of the sliding seat.

[0025] Specifically, the eccentric cam is fixed to the gear by at least two locating pins.

[0026] Specifically, the cover-flipping mechanism also includes:

[0027] An arched frame fixed to the chassis;

[0028] A first lifting device fixed to the top of the arched frame and driven to rise and fall along the Z direction;

[0029] A lifting plate connected to the output end of the first lifting device;

[0030] The first pressure rollers are arranged at intervals along the X direction at the lower end of the lifting plate. The first pressure rollers are used to limit the middle position of the cover in the Z direction.

[0031] A crossbeam is connected to one end of the lifting plate via a connecting rod;

[0032] The second pressure rollers are arranged at intervals along the X direction at the lower end of the crossbeam. The second pressure rollers are used to limit the position of one edge of the cover in the Z direction.

[0033] Specifically, a pre-compression mechanism is also provided on the opposite side of the cover pushing mechanism, the pre-compression mechanism including:

[0034] A first bracket fixed to the chassis;

[0035] A second lifting device that is driven to rise and fall along the Z-direction at the top of the first bracket;

[0036] The pressure rod is connected to the output end of the second lifting device.

[0037] Specifically, the children's book cover folding device further includes a flattening mechanism, which includes:

[0038] A second bracket fixed to the chassis;

[0039] A third lifting device fixed to the top of the second bracket and driven to rise and fall along the Z direction;

[0040] The pressure plate is connected to the output end of the third lifting device.

[0041] The beneficial effects of this utility model are:

[0042] This application discloses a children's book cover folding device, comprising a housing, a conveying mechanism, a cover flipping mechanism, and a cover pushing mechanism. The cover flipping mechanism uses a series of synchronously meshing gears to drive a coaxial eccentric cam to rotate. Combined with a unique design where the arc length of the protruding top increases sequentially along the cover conveying direction, multiple lifting pushers create a staggered, continuous, undulating wave-like motion trajectory. This design achieves continuous, gradual, and gentle folding of the cover's free edge, greatly reducing stress concentration and the risk of indentations. Subsequently, the flipping plate of the cover pushing mechanism, through a sudden and powerful folding action, completely folds the initially flipped free edge of the cover into a stable hinged state. This device significantly improves the smoothness of the folding process, the quality of the finished product, and production efficiency. Attached Figure Description

[0043] Figure 1 A perspective view of the children's book cover folding device of this application;

[0044] Figure 2 Left view of the children's book cover folding device of this application;

[0045] Figure 3 for Figure 2 Sectional view along line AA;

[0046] Figure 4 for Figure 3 Enlarged view of section B;

[0047] Figure 5 A perspective view of the structure of the mechanism for flipping up the cover of this application;

[0048] Figure 6 A perspective view of the cover-flipping mechanism and the conveying mechanism of this application;

[0049] Figure 7 This is a perspective view of the conveying mechanism of this application;

[0050] Figure 8 A perspective view of the cover lifting mechanism and pre-compression mechanism of this application.

[0051] The attached figures are labeled as follows: chassis 10, conveying mechanism 20, support frame 21, first guide rail 22, book pushing assembly 23, cover 70, cover flipping mechanism 30, gantry frame 31, gear 32, eccentric cam 33, protrusion 331, arc top surface 3311, guide slope 3312, lifting push block 34, limit post 35, drive motor 36, cover pushing mechanism 40, flip plate 41, pushing device 42, sliding seat 231, stop block 232, cylinder 233, positioning pin 332, arch frame 37, first lifting device 38, lifting plate 39, first pressure roller 310, connecting rod, crossbeam 311, second pressure roller 312, pre-pressing mechanism 50, first support 51, second lifting device 52, pressure rod 53, flat pressing mechanism 60, second support 61, third lifting device 62, pressure plate 63. Detailed Implementation

[0052] This utility model provides a children's book cover folding device. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0053] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are 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 limiting this invention.

[0054] Please refer to Figures 1 to 8 This embodiment discloses a children's book cover folding device, including a housing 10, a conveying mechanism 20, a cover flipping mechanism 30, and a cover pushing mechanism 40; the conveying mechanism 20 is installed on the housing 10 and is used to convey the cover 70 along the X direction; the cover flipping mechanism 30 is disposed above the conveying mechanism 20 and is located at the starting position along the conveying direction of the cover 70; the cover pushing mechanism 40 is disposed after the cover flipping mechanism 30 along the conveying direction of the cover 70.

[0055] The conveying mechanism 20 includes two side-by-side support frames 21 arranged in the Y direction with adjustable spacing, a first guide rail 22 extending in the X direction and disposed on one of the support frames 21, and a book-pushing component 23 slidably mounted on the first guide rail 22 for pushing the cover 70 in the X direction.

[0056] Please refer to Figure 4 and Figure 5The cover-flipping mechanism 30 includes a gantry frame 31 fixed on the support frame 21, a plurality of gears 32 rotatably mounted inside the gantry frame 31 via a pivot and meshing sequentially, an eccentric cam 33 coaxially fixed to each gear 32, a lifting push block 34 movable above the gantry frame 31, a limiting post 35 fixed below the lifting push block 34 and periodically rolling against the protrusion 331 of the eccentric cam 33, and a drive push block 34 disposed inside the gantry frame 31. The return spring is for downward reset and the drive motor 36 is fixed on the housing 10 and used to drive any one of the rotating shafts; wherein, each eccentric cam 33 is provided with a single fan-shaped protrusion 331 around its rotating shaft axis; the protrusion 331 is composed of an arcuate top surface 3311 located at the top arc length and guide inclined surfaces 3312 with the same arc and length on both sides of the top surface; the top arc length of the protrusion 331 of each eccentric cam 33 arranged sequentially along the conveying direction of the cover 70 increases sequentially.

[0057] Please refer to Figure 8 The cover lifting mechanism 40 includes a flap 41 rotatably mounted on a support frame 21 via a pivot, and a pushing device 42 fixed on the support frame 21 for pushing one end of the flap 41 upward to make it rotate around the pivot; the flap 41 is used to receive the cover 70 initially lifted by the cover lifting mechanism 30 and flip it into a hinged state.

[0058] The operation of the children's book cover folding device in this embodiment is as follows: The cover 70, with the book core attached, is stably supported and precisely guided by the conveying mechanism 20. The book pushing component 23 moves along the first guide rail 22, continuously pushing the cover 70 forward in the X direction toward the cover flipping mechanism 30. After entering the area of ​​the cover flipping mechanism 30, the drive motor 36 starts, driving a set of meshing gears 32 to rotate synchronously. The eccentric cam 33, which is fixed coaxially to each gear 32, rotates accordingly. The eccentric cam 33 has a unique single fan-shaped protrusion 331. Its core is composed of a central arc-shaped top surface 3311 and two symmetrical guide slopes 3312 with the same slope on both sides, which periodically contact the limiting post 35 during rotation. When the guide slope 3312 of the protrusion 331 contacts the limiting post 35 and rolls upward, the lifting push block 34, which is fixedly connected to it, overcomes the spring force of the reset spring and pushes upward; as it rotates, the arc top surface 3311 provides a relatively stable support; subsequently, the guide slope 3312 on the other side guides the limiting post 35 to descend smoothly, and the lifting push block 34 resets under the action of the reset spring.

[0059] This application employs eccentric cams 33 arranged along the cover conveying direction, with the top arc length of their protrusions 331 increasing sequentially. This means that the lifting time of the foremost cam (corresponding to the start of the cover folding) is the shortest, while the lifting time of the eccentric cams 33 behind it is progressively longer. This design, combined with the synchronous transmission of the gears 32, causes the multiple lifting pushers 34 arranged along the forward direction of the cover 70 to exhibit a highly ordered, continuous, undulating wave-like motion: when the front lifting pusher 34 briefly lifts the corner of the cover 70 and falls, the adjacent lifting pusher 34 behind it has already been lifted higher and held for a longer time, forming a dynamic tilted support surface. This continuously and smoothly lifts the other half (free edge) of the cover to be folded from a flat state to an angle (not completely upright) in an arc. The cover that has completed the initial folding is then conveyed to the cover lifting mechanism 40. At this moment, the pushing device 42 is activated, quickly lifting one end of the push plate 41 upwards. The flap 41 instantly flips upwards around the pivot axis, like a shovel catching the free edge of the cover 70 that has been initially flipped up. With its rapid and powerful flipping action, the free edge of the cover is completely and neatly folded upwards by more than 90 degrees, finally forming a stable hinge state.

[0060] The synchronous meshing of multiple gears 32 in this application ensures precise phase uniformity of all eccentric cams 33. The unique combination design of the symmetrical guide slope 3312 and the arc-shaped top surface 3311 of the protrusion 331 enables a smooth transition during the rising, stable support, and lowering of the lifting pusher 34, with minimal impact. In particular, the ingenious arrangement of the top arc length increasing sequentially along the conveying direction creates a staggered, continuous, undulating wave-like motion trajectory for the multiple lifting pushers 34. This achieves continuous, gradual folding of the cover's free edge, as natural as a finger brushing across a page, rather than a one-time forced lift by a rigid ramp. This gradual folding method applies a more uniform and controllable force, greatly reducing the risk of stress concentration or indentation on the cover 70.

[0061] Furthermore, in this embodiment, the gantry 31 is used as the rotation fulcrum at both ends of the gear 32. The gantry 31 is used as the rotation fulcrum at both ends of the gear 32, providing a stable and precise support platform for multiple sets of gears 32 and their coaxial eccentric cams 33. This ensures the concentricity and synchronous stability of the rotational movement of the entire transmission system, effectively reduces the transmission error caused by vibration or support offset, and ensures the continuity and accuracy of the wave-like lifting action of the lifting push block 34.

[0062] Please refer to Figure 7The book-pushing assembly 23 includes a sliding base 231, a stop 232 rotatably mounted on the sliding base 231, and a cylinder 233 mounted on the sliding base 231 and used to drive the blocking part of the stop 232 upward beyond the upper surface of the sliding base 231. When the book-pushing assembly 23 is working, the cylinder 233 drives the blocking part of the stop 232 upward, causing it to protrude beyond the upper surface of the sliding base 231. After the cover 70, which is ready to be folded, is placed in place, the sliding base 231 moves along the first guide rail 22. At this time, the blocking part protruding above the sliding base 231 reliably contacts and pushes the edge of the cover 70 forward, smoothly conveying it to the accurate position of the cover-flipping mechanism 30. After the conveying is completed, the cylinder 233 controls the stop 232 to sink down and retract completely, and the blocking part completely releases the pushing restriction on the cover 70, facilitating the uninterrupted subsequent folding action or the reset of the cover 70 to the ready position. This design of the adjustable stop 232 enables reliable directional pushing of the cover 70 and can immediately remove physical obstruction at the end of the conveying process.

[0063] Please refer to Figure 4 and Figure 5 The eccentric cam 33 is fixed to the gear 32 by at least two locating pins 332. In this embodiment, at least two locating pins 332 are used to fix the eccentric cam 33 and the gear 32, forming a double-locating structure. This design effectively eliminates the radial displacement and rotational misalignment that may occur with a single-point connection, and significantly suppresses the assembly gap and relative wobble between the gear 32 and the eccentric cam 33 under high-speed operation, providing a stable and reliable power transmission for the lifting push block 34.

[0064] Please refer to Figure 6 The cover flipping mechanism 30 also includes an arched frame 37 fixed on the housing 10, a first lifting device 38 fixed on the top of the arched frame 37 and driven to lift and lower in the Z direction, a lifting plate 39 connected to the output end of the first lifting device 38, a first pressure roller 310 arranged at intervals in the X direction at the lower end of the lifting plate 39 and used to limit the middle position of the cover 70 in the Z direction, a crossbeam 311 connected to one end of the lifting plate 39 by a connecting rod, and a second pressure roller 312 arranged at intervals in the X direction at the lower end of the crossbeam 311. The second pressure roller 312 is used to limit the edge position of one end of the cover 70 in the Z direction.

[0065] When the cover 70 is pushed to the starting position below the cover flipping mechanism 30 by the book pushing assembly 23, the first lifting device 38 drives the lifting plate 39 and the connected crossbeam 311 to descend synchronously, so that the first pressure roller 310 and the second pressure roller 312 mounted on their lower surfaces are lowered to a predetermined height that maintains slight rolling contact with the cover 70 (i.e., providing Z-axis limiting). When the cover flipping mechanism 30 starts working, the drive motor 36 drives the meshing gear 32 to rotate the eccentric cam 33. As the protrusion 331 of the eccentric cam 33 pushes the limiting post 35 and the lifting push block 34 upward, the edge of the cover 70 located in the folding area (non-book block part) is gradually lifted in a wave-like manner to form an arc surface. During this process, the first pressure roller 310 always acts above the book block gluing area in the middle of the cover 70, and the second pressure roller 312 acts above the edge of the non-folding side (book block side) of the cover 70. These two pressure roller assemblies only provide a light, downward pressure limit (to prevent the cover from accidentally tilting or jumping up), and allow the cover 70 to roll smoothly forward along the X direction under the pushing force of the book pushing assembly 23 (the first pressure roller 310 and the second pressure roller 312 themselves roll accordingly). While the cover 70 is being horizontally conveyed (in the X direction), under the wave-like lifting action of the lifting push block 34 of the cover flipping mechanism 30, its non-book block portion gradually and continuously flips up from a flat state, bending to form a transition arc surface.

[0066] The key function of the first pressure roller 310 and the second pressure roller 312 in this application is to achieve dynamic rolling restraint. Through their own rolling characteristics, they flexibly constrain key areas of the cover 70 (the joint between the book blocks and the opposite edges) only in the vertical direction (Z direction), effectively preventing unnecessary overall floating, displacement, or local twisting deformation of the cover 70 during wave-like lifting or transport. At the same time, this restraint method fully preserves the cover 70's free transport capability in the X direction, ensuring that the cover 70 can move smoothly and continuously and progressively fold while being pushed by the book-pushing component 23.

[0067] Please refer to Figure 8 On the opposite side of the cover-lifting mechanism 40, a pre-pressing mechanism 50 is also provided. The pre-pressing mechanism 50 includes a first bracket 51 fixed to the chassis 10, a second lifting device 52 driven to rise and fall along the Z direction on the top of the first bracket 51, and a pressure rod 53 connected to the output end of the second lifting device 52. When the cover 70 is flipped into a hinged state by the cover-lifting mechanism 40, the second lifting device 52 of the pre-pressing mechanism 50 drives the pressure rod 53 to press down quickly, covering the closed cover 70. This pre-pressing action provides gentle and extensive vertical pressure to the hinged cover 70 before flat pressing, mainly to quickly stabilize the closed shape of the cover 70, counteract its natural rebound tendency, and prevent it from accidentally springing open or loosening during transfer or waiting for subsequent flat pressing.

[0068] Please refer to Figure 1 The children's book cover folding device also includes two flat pressing mechanisms 60 arranged along the x-direction. Each flat pressing mechanism 60 includes a second support 61 fixed to the housing 10, a third lifting device 62 fixed to the top of the second support 61 and driven to rise and fall along the Z-direction, and a pressure plate 63 connected to the output end of the third lifting device 62. After the pre-pressing mechanism 50 stabilizes the cover 70 in its hinged state, the third lifting device 62 of the flat pressing mechanism 60 is activated, driving the pressure plate 63 at its output end to press down smoothly, applying a large-scale and uniform pressure perpendicular to its plane to the entire closed surface of the cover 70. This flat pressing action, based on the pre-pressing, applies a strong and comprehensive final pressure, aiming to completely eliminate any minor gaps or air bubbles that may exist between the cover 70 and the book block, and between the two cover wings, ensuring a complete, uniform, and firm bond of the adhesive layer, and correcting any slight deformation that may occur during the folding process of the cover 70, ultimately obtaining a flat, firm, well-shaped, and tightly fitted high-quality finished product.

[0069] The preferred embodiments of this utility model have been described in detail above. However, this invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this invention.

Claims

1. A children's book cover folding device, characterized in that, include: Chassis (10); A conveying mechanism (20), mounted on the housing (10), for conveying the cover (70) along the X direction, comprising: Two side-by-side support frames arranged along the Y direction with adjustable spacing (21); A first guide rail (22) extending in the X direction is disposed on one of the support brackets (21); A book-pushing assembly (23) is slidably mounted on the first guide rail (22) and used to push the cover (70) along the X direction; A cover-flipping mechanism (30) is disposed above the conveying mechanism (20) and located at the starting position along the conveying direction of the cover (70), comprising: A gantry frame (31) fixed on the support frame (21); Multiple gears (32) that are rotatably mounted inside the gantry frame (31) via a pivot and mesh sequentially; An eccentric cam (33) is fixed coaxially with each of the gears (32); each eccentric cam (33) is provided with a single fan-shaped protrusion (331) around its axis of rotation; the protrusion (331) is composed of an arcuate top surface (3311) located at the top arc length and guide inclined surfaces (3312) with the same arc and consistent length connected on both sides of the top surface; A lifting push block (34) that can be raised and lowered above the gantry (31); A limiting post (35) is fixed below the lifting push block (34) and periodically rolls against the protrusion (331) of the eccentric cam (33); A reset spring is installed inside the gantry (31) and is used to drive the lifting push block (34) to return downward; A drive motor (36) fixed on the housing (10) and used to drive any one of the rotating shafts; wherein, the top arc length of the protrusions (331) of each eccentric cam (33) arranged sequentially along the conveying direction of the cover (70) increases sequentially. A cover-lifting mechanism (40) is disposed after the cover-flipping mechanism (30) along the cover (70) conveying direction, and includes: A flap (41) is rotatably mounted on the support frame (21) via a pivot; A pusher (42) fixed on the support frame (21) and used to push one end of the flip plate (41) upward to make it flip around the pivot; the flip plate (41) is used to receive the cover (70) initially flipped by the cover flipping mechanism (30) and flip it into a hinged state.

2. The children's book cover folding device according to claim 1, characterized in that, The book pushing assembly (23) includes a sliding seat (231), a stop (232) rotatably disposed on the sliding seat (231), and a cylinder (233) disposed on the sliding seat (231) and used to drive the blocking part of the stop (232) upward beyond the upper end face of the sliding seat (231).

3. A child passbook cover folding device as claimed in claim 1, wherein The eccentric cam (33) is fixed to the gear (32) by at least two locating pins (332).

4. A child identification card cover flip device as defined in claim 1 wherein, The cover flipping mechanism (30) also includes: An arched frame (37) is fixed to the chassis (10); A first lifting device (38) fixed to the top of the arched frame (37) and driven to rise and fall along the Z direction; A lifting plate (39) connected to the output end of the first lifting device (38); The first pressure rollers (310) are arranged at intervals along the X direction at the lower end of the lifting plate (39). The first pressure rollers (310) are used to limit the middle position of the cover (70) in the Z direction. The crossbeam (311) is connected to one end of the lifting plate (39) by a connecting rod; The second pressure rollers (312) are arranged at intervals along the X direction at the lower end of the crossbeam (311). The second pressure rollers (312) are used to limit the position of one end edge of the cover (70) in the Z direction.

5. A child-resistant book cover folding device as defined in claim 1 wherein: A pre-compression mechanism (50) is also provided on the opposite side of the cover pushing mechanism (40), the pre-compression mechanism (50) comprising: The first bracket (51) is fixed on the chassis (10); A second lifting device (52) is driven to lift and lower at the top of the first bracket (51) along the Z direction; The pressure rod (53) is connected to the output end of the second lifting device (52).

6. A child passbook cover folding device according to claim 1, wherein The children's book cover folding device further includes a flattening mechanism (60), which includes: A second bracket (61) is fixed to the chassis (10); A third lifting device (62) is fixed to the top of the second bracket (61) and driven to rise and fall along the Z direction; The pressure plate (63) is connected to the output end of the third lifting device (62).

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