Full-automatic child card book cover forming machine

Abstract

The invention relates to the technical field of child book production, and particularly discloses a child card book cover full-automatic forming machine which comprises a cover discharging device, a cover transferring device, a glue printing device, a book block mounting device, a cover folding device and a flat pressing device. The cover discharging device achieves single-piece continuous paper extraction separation of stacked covers through cooperation of a distance-adjustable bottom conveying mechanism and a cover guiding component, the cover folding device adopts gradual cam folding to cooperate with a pre-pressing mechanism to act, and the flat pressing device is provided with double pressing strips to reinforce crease forming. Multi-specification high-speed separation is achieved through the continuous paper extraction design of the cover discharging device; the transfer device carries out multi-section conveying to ensure precise connection of stations; dislocation and indentation are eliminated through oblique reverse pushing and buffering adjustment of the laminating device; the cover is prevented from being damaged by progressive buffering action of the folding device; the whole machine achieves high-speed automation of the whole process from discharging, glue printing, mounting, folding to press-fit forming, and the production efficiency and the product consistency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of children's book production, in particular to a fully automatic forming machine for children's card book covers. Background Art

[0002] The production process for children's card books typically includes five major steps: cover feeding, cover gluing, book block laminating, cover folding, and flat pressing. This process requires that after the covers are automatically discharged, they are sequentially processed along a conveyor line, where they are glued, precisely attached to the book block, folded, and then pressed into place. The cover discharge process must accommodate rapid separation of covers of varying sizes, while the laminating and folding stations must address issues such as cover misalignment and spatial interference. This places high demands on the equipment's automation and structural design.

[0003] Traditional production methods usually require manual operation, which has obvious shortcomings. For example, manual feeding is inefficient and the rhythm is unstable, making it difficult to match the speed of automated production lines; the semi-automatic discharge device relies on a cylinder to lift and push the cover, and each cover needs to go through a lifting, pushing, and resetting cycle, and the discharge rhythm is limited by the mechanical reciprocating cycle. At the mounting station, high-speed conveyance of the cover is prone to causing the book core to be pressed down and misaligned due to inertia overtravel, while the conventional reverse thrust device directly bears the reaction force from the cam, and wear after long-term operation seriously affects the positioning accuracy. In the folding process, the rigidly driven flap is prone to interference with the book core pressing mechanism, and stress concentration at the bending point of the cover can easily cause indentations or offsets. In addition, when faced with covers of different sizes, traditional equipment needs to stop and manually adjust the conveying channel or baffle spacing, which takes a long time to change and debug, restricting the flexibility of the production line.

[0004] Chinese patent publication number CN116080296B discloses a hardcover cover production line. While this line integrates lamination and spine pressing functions, it still has limitations. Cover separation relies on a conveyor belt, lacking an efficient single-sheet continuous extraction mechanism. The book block and cover are positioned using a telescopic mechanism rather than a dynamic reverse thrust mechanism, which cannot address cover overtravel and misalignment during high-speed conveying. The folding mechanism uses rigid guide strips to force the cover upright, which can easily damage the cover and results in choppy movement. The overall structure lacks adaptive cover size adjustment, making it difficult to meet the diverse, high-speed production demands of children's card books.

[0005] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a fully automatic forming machine for children's card covers to solve the above-mentioned problems.

[0007] A fully automatic forming machine for children's card covers, comprising a cover discharge device, a cover transfer device disposed at the discharge end of the cover discharge device and conveying the cover in the X direction, a glue printing device, a book block laminating device, a cover folding device, and a flat pressing device sequentially disposed along the conveying direction of the cover transfer device;

[0008] The cover discharging device includes a first frame, a stacking mechanism provided on the first frame, a bottom conveying mechanism provided below the stacking mechanism and used to support and convey covers along the X-direction, and a discharging mechanism provided on one side of the stacking mechanism in the X-direction and located above the bottom conveying mechanism; the discharging mechanism includes a cover guiding component provided at its lower portion; the bottom conveying mechanism includes a plurality of first conveying units arranged at intervals along the Y-direction and capable of synchronously changing the spacing; the cover guiding component cooperates with the first conveying unit to sequentially extract the bottom cover of the supported stacked covers along the X-direction and convey the cover out;

[0009] The cover conveying device includes a plurality of second conveying units arranged in sequence along the X direction, and the second conveying units are used to convey the cover along the X direction;

[0010] A glue printing station is provided above one of the second conveying units, and the glue printing device is provided at the glue printing station for printing glue on the cover conveyed by the second conveying unit;

[0011] A mounting station is provided above one of the second conveying units, and the book block mounting device is provided at the mounting station for mounting the book block on the cover;

[0012] A folding station is provided above one of the second conveying units, and the cover folding device is provided at the folding station for folding the cover;

[0013] A flat pressing station is provided above one of the second conveying units, and the flat pressing device is provided at the flat pressing station for pressing the cover and the book block into shape.

[0014] Specifically, the stacking mechanism includes a first guide rail provided on the first frame along the X direction;

[0015] a sliding frame capable of sliding along the first guide rail to adjust its position;

[0016] a first belt conveyor device provided on the sliding frame and used for conveying in the X direction, wherein a stacking channel is provided below the discharge end of the first belt conveyor device;

[0017] The bottom conveying mechanism also includes:

[0018] A second guide rail provided on the first frame along the Y direction;

[0019] Two first sliding seats sliding on the second guide rail, each of the first sliding seats being provided with a first baffle;

[0020] a first scissor structure connected between the two first sliding seats;

[0021] a plurality of second sliding seats, each of which slides on the second guide rail and is respectively connected to the first rotating shaft at each intersection position of the first scissor-type structure; the first conveying unit is a second belt conveyor device, and the second belt conveyor device is disposed on the second sliding seat;

[0022] a first driving device for driving the two first sliding seats to move toward or away from each other; the movement of the first sliding seats causes all the second sliding seats to move synchronously along the Y direction via the first scissor structure, thereby synchronously adjusting the spacing between the second belt conveyors and the spacing between the two first baffles;

[0023] The discharging mechanism further includes a third sliding seat whose position is adjustable along the Y direction;

[0024] The cover guiding component includes an arc-shaped guide plate fixed on the third sliding seat, and a guide wheel arranged in the middle of the arc-shaped guide plate and with the lower end passing through the arc-shaped guide plate. The arc-shaped guide plate and the guide wheel are used to guide the cover at the bottom layer of the stacked covers to be transported out in sequence along the X direction.

[0025] Specifically, the stacking mechanism further includes two centering devices located above the first belt conveyor device, the centering devices including a second scissor-type structure provided on the sliding frame and a push plate connected to one end of the second scissor-type structure, with a positioning channel with an adjustable spacing formed between the two push plates;

[0026] The stacking mechanism further comprises:

[0027] a material discharge guide plate, provided below the discharge end of the first belt conveyor device, for guiding the stacked covers to the stacking channel;

[0028] a second driving device, provided on the first frame, for driving the sliding frame along the X direction;

[0029] The discharging mechanism further comprises:

[0030] a third drive device;

[0031] a first screw with forward and reverse thread segments, driven by the third driving device;

[0032] The two third sliding seats respectively form threaded cooperation with the two threaded sections of the first screw; the third driving device drives the forward and reverse screws to rotate, thereby driving the two third sliding seats to move synchronously in opposite directions or in opposite directions along the Y direction.

[0033] The discharging device further includes an inclined conveying mechanism, which includes:

[0034] An oblique guide plate is provided on the X-direction output side of the discharging mechanism;

[0035] Two lifting seats, fixed to the frame and located on both sides of the oblique guide plate in the Y direction;

[0036] Multiple sets of third belt conveyor devices are arranged along the Y direction;

[0037] Both ends of each group of third belt conveyors are respectively connected to the two lifting seats in a liftable manner;

[0038] The lifting seat is used to synchronously adjust the lifting height of all the third belt conveyors relative to the oblique guide plate;

[0039] When the third belt conveyor device is lowered, the lower end surface of the belt is parallel to the upper end surface of the oblique guide plate, and together they form an oblique conveying path.

[0040] Specifically, the second conveying unit includes a second frame, a plurality of first supporting brackets arranged on the second frame, a third guide rail arranged on the first supporting bracket along the x-direction, and a book pushing mechanism slidably arranged on the third guide rail; the book pushing mechanism includes a fourth sliding seat that slides with the third guide rail, a plurality of blocking blocks pivotally connected to the fourth sliding seat and spaced apart along the x-direction, a pull rod for simultaneously driving one end of all blocking blocks to flip up or flip down for storage, a fourth driving device fixed to the fourth sliding seat and driving the pull rod, and a fifth driving device arranged on the second frame and used to drive the book pushing mechanism to reciprocate along the x-direction; the height of the blocking block after flipping up is higher than the height of the first supporting bracket.

[0041] Specifically, the blocking block is provided with a rotating portion and a pulling portion; the rotating portion is pivotally connected to the fourth sliding seat via a second rotating shaft, and the pulling portion is pivotally connected to the pull rod via a third rotating shaft; a limiting shaft is fixed to the fourth sliding seat, and the blocking block is provided with an arc-shaped guide hole for sliding of the limiting shaft;

[0042] The second conveying unit further includes a spacing adjustment mechanism, and the spacing adjustment mechanism includes:

[0043] a second screw with forward and reverse thread sections;

[0044] Threaded bushings fixed to the first support brackets on both sides, respectively, the two threaded bushings being threadably engaged with the two threaded sections of the second screw rod respectively;

[0045] A fourth guide rail fixed to the second frame, wherein the lower end of the threaded sleeve is in sliding engagement with the fourth guide rail; the second frame is provided with a sixth driving device for driving the screw to rotate;

[0046] A limiting module is provided at the edge of the second frame. The limiting module includes a plurality of side wheels spaced apart along the x-direction for positioning the side edge of the cover.

[0047] Specifically, the rubber printing device includes:

[0048] Vertical plates fixed on both sides of the second conveying unit in the Y direction;

[0049] a printing roller rotatably disposed between the two vertical plates;

[0050] A side flap, one end of which is hinged to the vertical plate;

[0051] a gluing roller, rotatably disposed between the two side flaps and parallel to the printing roller;

[0052] A glue groove, provided between the two side flaps and cooperating with the glue coating roller;

[0053] a telescopic driver connected between the vertical plate and the side flap;

[0054] The telescopic driver is used to drive the side flap to rotate around its hinge point to adjust the angle, thereby adjusting the gap between the glue coating roller and the printing roller.

[0055] Specifically, a reverse thrust device is provided below the laminating station, and the reverse thrust device includes:

[0056] A positioning plate, wherein the positioning plate is provided with a movable hole extending vertically;

[0057] a drive assembly comprising a seventh drive device mounted on the positioning plate, a fourth rotating shaft drivingly connected to the seventh drive device, and a cam coaxially fixedly connected to the fourth rotating shaft;

[0058] The pushing assembly includes a fourth support frame movable in the movable hole in the left-right and up-down directions, a pushing member fixed to the upper end of the fourth support frame, and a roller rotatably mounted on the lower end of the fourth support frame; the roller rolls along the surface of the cam to drive the pushing member to reciprocate in an oblique direction;

[0059] The guide assembly includes a first vertical plate fixed to the bottom of the positioning plate, an inclined guide rail fixed to the first vertical plate, and a first sliding block fixed to the fourth support frame and slidably matched with the inclined guide rail.

[0060] Specifically, the cam is a fan-shaped structure;

[0061] An elastic reset member is further connected between the fourth support frame and the first vertical plate, and the elastic reset member is used to maintain stable contact between the roller and the cam;

[0062] The pusher includes a transverse plate fixed on the fourth support frame, a plurality of second support frames spaced apart on the transverse plate along the front-to-back direction, and a pusher plate fixed on the second support frames; the pusher plate is an L-shaped structure.

[0063] Specifically, the book block bonding device includes:

[0064] Book block loading mechanism, including:

[0065] a third conveying unit located above and to one side of the second conveying unit and conveying book blocks along the y-direction;

[0066] An inclined material guiding device provided at the discharge end of the third conveying unit;

[0067] a book block feeding device provided at the discharge end of the inclined guide device, the book block feeding device comprising two vertical plates mounted above the second conveying unit, and a conveying channel formed between the two vertical plates with an adjustable spacing;

[0068] The pressing mechanism includes two pressing devices respectively provided on the two vertical plates; the pressing devices include:

[0069] a mounting plate fixed to the vertical plate;

[0070] a first driver fixed to the mounting plate;

[0071] a first pressing plate connected to the output end of the first driver and used for pressing the book block in the conveying channel along the z-direction to the upper end of the cover conveyed by the second conveying unit;

[0072] The buffer adjustment mechanism comprises:

[0073] A second driver fixed to a mounting plate of one of the pressing devices and driven in the Z direction;

[0074] a fifth sliding seat connected to the output end of the second driver;

[0075] a lower extension arm fixed to the lower end of the fifth sliding seat;

[0076] a mounting rod provided on the lower extension arm;

[0077] a plurality of buffer members spaced apart along the y-direction on the mounting rod;

[0078] The buffer member comprises:

[0079] a connecting plate fixed to the mounting rod;

[0080] an elastic arm connected to the connecting plate;

[0081] a contact plate connected to one end of the elastic arm and disposed toward the conveying channel;

[0082] Wherein, one side of the book block in the conveying channel abuts against the contact plate.

[0083] Specifically, the inclined material guiding device includes a first inclined slide provided below the discharge end of the third conveying unit and connected to the conveying channel, and a first pushing device provided on one side of the first inclined slide and used to push the book block into the conveying channel along the y direction;

[0084] The book block loading mechanism also includes a translation assembly for adjusting one of the vertical plates along the x-direction, and the translation assembly includes a rack provided on the y-direction side of the second conveying unit, a first gear meshing with the rack, a connecting column coaxially transmitted with the first gear, a third driver for driving the connecting column to rotate, a bearing fixed to the vertical plate and sleeved on the connecting column, and a first slide rail provided along the x-direction, a second slider being provided on the first slide rail, and the gear rotation is provided on the second slider.

[0085] Specifically, the cover folding device includes:

[0086] The cover flipping mechanism is arranged above the second conveying unit and includes:

[0087] a gantry frame fixed on the first supporting bracket;

[0088] A plurality of second gears rotatably mounted in the gantry via a fifth rotating shaft and meshing sequentially;

[0089] An eccentric cam is coaxially fixed to each of the second gears; the eccentric cam is provided with a sector-shaped raised portion; the raised portion is composed of an arc top surface with a long arc length at the top and guide inclined surfaces with the same arc and length connected to both sides of the top surface;

[0090] A lifting push block that can be lifted and moved above the gantry;

[0091] A limiting column fixed below the lifting push block and periodically rolling and abutting against the raised portion of the eccentric cam;

[0092] A return spring disposed in the gantry and used to drive the lifting push block to return downward;

[0093] a drive motor for driving any one of the fifth rotating shafts; wherein the arc lengths of the tops of the raised portions of the eccentric cams arranged in sequence along the cover conveying direction are increased in sequence;

[0094] The cover pushing mechanism is arranged behind the cover turning mechanism along the cover conveying direction, and comprises:

[0095] A flap rotatably mounted on the support bracket via a pivot;

[0096] A second pushing device is fixed on the support bracket and is used to push one end of the flip plate upward to flip it around the pivot; the flip plate is used to receive the cover initially flipped up by the cover flipping mechanism and flip it into a hinge state.

[0097] Specifically, the eccentric cam is fixed to the second gear via at least two positioning pins; the cover flipping mechanism further includes:

[0098] an arch frame fixed to the second conveying unit;

[0099] A first lifting device fixed to the top of the arch frame and driven to lift along the Z direction;

[0100] a lifting plate connected to the output end of the first lifting device;

[0101] First pressing wheels are arranged at intervals along the X direction at the lower end of the lifting plate, and the first pressing wheels are used to limit the middle position of the cover in the Z direction;

[0102] A crossbeam connected to one end of the lifting plate via a connecting rod;

[0103] Second pressing wheels are arranged at intervals along the X direction at the lower end of the beam, and the second pressing wheels are used to limit the edge position of one end of the cover in the Z direction;

[0104] A pre-pressing mechanism is further provided on the opposite side of the cover pushing mechanism, and the pre-pressing mechanism includes:

[0105] a first support frame fixed on the second conveying unit;

[0106] A second lifting device fixed to the top of the first support frame and driven to rise and fall along the Z direction;

[0107] A pressure rod is connected to the output end of the second lifting device.

[0108] Specifically, the flattening device includes:

[0109] a second support frame fixed on the second conveying unit;

[0110] a third lifting device fixed to the top of the second support frame and driven to rise and fall along the Z direction;

[0111] A second pressing plate is connected to the output end of the third lifting device.

[0112] Specifically, the automatic forming machine for children's card covers further includes a pressing device provided on one side of the flat pressing device in the X direction, and the pressing device includes:

[0113] a third supporting frame fixed on the second conveying unit;

[0114] a fourth lifting device fixed to the top of the third support frame and driven to rise and fall along the Z direction;

[0115] a first pressing strip connected to an output end of the fourth lifting device, the first pressing strip being used to press an upper indentation on an upper end of a bend of the folding cover;

[0116] A second pressing strip is fixed on the second conveying unit and is located directly below the first pressing strip, and the second pressing strip is used to press a lower indentation on the lower end of the bend of the folding cover.

[0117] Beneficial effects of the present invention:

[0118] The fully automatic forming machine for children's card covers disclosed in this application includes a cover discharging device, a cover transfer device, a glue printing device, a book core mounting device, a cover folding device, and a flat pressing device. The cover transfer device includes multiple conveying units connected in sequence. The cover discharging device uses a bottom conveying mechanism with adjustable spacing to cooperate with the cover guide component to achieve single-sheet continuous paper extraction and separation of stacked covers. The book core mounting device integrates reverse positioning and elastic buffer adjustment. The cover folding device uses a progressive cam folding and pre-pressing mechanism to work together. The flat pressing device is equipped with double pressure strips to enhance crease shaping. This application achieves high-speed separation of multiple specifications through the continuous paper extraction design of the cover discharging device. The multi-stage conveying of the transfer device ensures precise connection between workstations. The oblique reverse push and buffer adjustment of the mounting device eliminates misalignment and indentation. The progressive buffering action of the folding device avoids cover damage. The double pressure strips of the flat pressing device enhance crease durability. The entire machine achieves high-speed automation of the entire process from discharging, glue printing, mounting, folding to pressing and forming, significantly improving production efficiency and product consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0119] Figure 1 A three-dimensional diagram of a fully automatic forming machine for children's card covers according to an embodiment of the present application;

[0120] Figure 2 A cross-sectional view of a fully automatic forming machine for children's card covers according to an embodiment of the present application;

[0121] Figure 3 for Figure 2 Enlarged view of part A;

[0122] Figure 4 A three-dimensional diagram of a cover discharging device according to an embodiment of the present application;

[0123] Figure 5A three-dimensional diagram of a stacking mechanism according to an embodiment of the present application;

[0124] Figure 6 A three-dimensional diagram of the bottom conveying mechanism according to an embodiment of the present application;

[0125] Figure 7 A three-dimensional diagram of the discharging mechanism and the inclined conveying mechanism of an embodiment of the present application;

[0126] Figure 8 for Figure 2 Enlarged view of part B;

[0127] Figure 9 A three-dimensional diagram of the book pushing mechanism according to an embodiment of the present application;

[0128] Figure 10 A three-dimensional diagram of a cover transfer device according to an embodiment of the present application;

[0129] Figure 11 for Figure 2 Enlarged view of part C;

[0130] Figure 12 A three-dimensional diagram of a printing device according to an embodiment of the present application;

[0131] Figure 13 for Figure 2 Enlarged view of part D in the middle;

[0132] Figure 14 A perspective view of a thrust reverser according to an embodiment of the present application;

[0133] Figure 15 A perspective view of a pushing assembly and a guiding assembly according to an embodiment of the present application;

[0134] Figure 16 A three-dimensional diagram of a book block mounting device according to an embodiment of the present application;

[0135] Figure 17 A three-dimensional diagram of the material pressing mechanism and the buffer adjustment mechanism according to an embodiment of the present application;

[0136] Figure 18 A three-dimensional diagram of the cover folding device and the flat pressing device according to an embodiment of the present application;

[0137] Figure 19 A three-dimensional diagram of the lower portion of the cover flipping mechanism according to an embodiment of the present application;

[0138] Figure 20 A three-dimensional diagram of the entire cover flipping mechanism according to an embodiment of the present application;

[0139] Figure 21 A three-dimensional diagram of the cover pushing mechanism and pre-pressing mechanism of an embodiment of the present application;

[0140] Figure 22 This is a three-dimensional diagram of the edge holding device according to an embodiment of the present application.

[0141] The accompanying drawings are marked as follows: cover discharge device 10, first frame 11, stacking mechanism 12, first guide rail 121, sliding frame 122, first belt conveyor 123, stacking channel 120, bottom conveying mechanism 13, first conveying unit 131, second guide rail 132, first sliding seat 133, first baffle 134, first scissors structure 135, second sliding seat 136, first driving device 138, discharge mechanism 14, third sliding seat 142, arc guide plate 143, guide wheel 144, third driving device 145, first screw 146, centering device 124, second scissors structure 1241, push plate 1242, positioning channel 1243, unloading guide plate 125, second driving device 126, inclined conveying mechanism 15, inclined Guide plate 151, lifting seat 152, third belt conveyor 153, cover transfer device 20, second conveying unit 21, second frame 211, first supporting frame 212, third guide rail 213, book pushing mechanism 214, fourth sliding seat 215, blocking block 216, rotating part 2161, pulling part 2162, pull rod 217, fourth driving device 218, fifth driving device 219, second rotating shaft 220, third rotating shaft 221, limiting shaft 222, arc-shaped guide hole 223, spacing adjustment mechanism 224, second screw 225, threaded sleeve 226, fourth guide rail 227, sixth driving device 228, side wheel 230, glue printing device 30, vertical plate 31, printing roller 32, side flip plate 33, glue coating roller 34, glue groove 3 5. Telescopic drive 36, book block mounting device 40, book block loading mechanism 41, third conveying unit 411, inclined guide device 412, first inclined slide 4121, first pushing device 4122, book block feeding device 413, vertical plate 4131, conveying channel 4132, pressing mechanism 42, pressing device 421, mounting plate 4211, first drive 4212, first pressing plate 4213, buffer adjustment mechanism 43, second drive 431, fifth sliding seat 432, lower extension arm 433, mounting rod 434, buffer member 435, connecting plate 4351, elastic arm 4352, contact plate 4353, translation assembly 414, rack 4141, connecting column 4143, third drive 4144, bearing 4145, first Slide rail 4146, second slider 4147, cover folding device 50, cover flipping mechanism 51, gantry 511, fifth rotating shaft 512, second gear 513, eccentric cam 514, protrusion 5141, lifting push block 515, limiting column 516, drive motor 518, arch frame 525, first lifting device 526, lifting plate 527, first pressure roller 528, connecting rod 529, crossbeam 530, second pressure roller 531, cover pushing mechanism 52, pivot 521, flip plate 522, second pushing device 523, pre-pressing mechanism 54, first support frame 541, second lifting device 542, pressure rod 543, flat pressing device 60, second support frame 61, third lifting device 62, second pressure plate 63, edge pressing device 70,Third support frame 71, fourth lifting device 72, first pressure bar 73, second pressure bar 74, reverse thrust device 80, positioning plate 81, drive assembly 82, seventh drive device 821, fourth rotating shaft 822, cam 823, pushing assembly 83, fourth support frame 831, pusher 832, roller 833, guide assembly 84, first vertical plate 841, inclined guide rail 842, first slider 843, elastic reset member 844, horizontal plate 8321, second supporting frame 8322, pusher plate 8323, cover 90. DETAILED DESCRIPTION

[0142] The present invention provides a fully automatic forming machine for children's card covers. To make the objectives, technical solutions, and effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit the present invention.

[0143] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0144] Please refer to Figure 1 and Figure 2 The fully automatic forming machine for children's card covers of this embodiment includes a cover discharge device 10, a cover transfer device 20 disposed at the discharge end of the cover discharge device 10 and conveying along the X-direction, a glue printing device 30, a book block laminating device 40, a cover folding device 50, and a press device 60 sequentially arranged along the conveying direction of the cover transfer device 20; the cover transfer device 20 includes a plurality of second conveying units 21 sequentially arranged along the X-direction, and the second conveying units 21 are used to convey the cover 90 along the X-direction. A glue printing station is provided above one of the second conveying units 21, and a glue printing device 30 is provided at the glue printing station, for printing glue on the cover 90 conveyed on the second conveying unit 21; a mounting station is provided above one of the second conveying units 21, and a book core mounting device 40 is provided at the mounting station, for mounting the book core on the cover 90; a folding station is provided above one of the second conveying units 21, and a cover folding device 50 is provided at the folding station, for folding the cover 90; a flat pressing station is provided above one of the second conveying units 21, and a flat pressing device 60 is provided at the flat pressing station, for pressing the cover 90 and the book core into shape.

[0145] The fully automatic forming machine for children's card book covers in this embodiment operates as follows: the cover discharge device 10 continuously extracts the bottom cover 90 from the stack along the X-axis and transfers it to the front end of the cover transfer device 20. The multiple second conveying units 21 of the cover transfer device 20 sequentially receive the covers 90 and convey them in a stepwise manner along the X-axis. When the cover 90 is transferred to the glue printing station, the glue printing device 30 precisely prints glue on the surface of the cover 90. The cover 90 then proceeds to the laminating station, where the book block laminating device 40 drives the book block vertically downward, ensuring stable adhesion between the glue area of ​​the book block and the cover 90. The laminated cover 90 then proceeds to the folding station, where the folding arm of the cover folding device 50 moves in an arc-shaped trajectory, gently folding the unbonded half of the cover 90 over the book block. Finally, the semi-finished product is transferred to the flat pressing station, where the lower pressing plate of the flat pressing device 60 presses vertically downward to press the covered cover 90 onto the book block.

[0146] This embodiment achieves high-speed single-sheet separation of covers 90 of various specifications through the continuous paper extraction design of the cover discharge device 10; the multi-stage second conveying unit 21 of the cover transfer device 20 ensures precise step-by-step transfer of the cover 90 between each workstation. The glue printing device 30, the book core mounting device 40, the cover folding device 50 and the flat pressing device 60 are integrated along the conveying path to form a fully automatic continuous production line. The buffered folding action of the folding device 50 avoids interference between the cover indentation and the structure, and the flat pressing device 60 provides stable molding pressure. The entire machine realizes the automation of the entire process from cover discharge, glue printing, mounting, folding to pressing and molding, significantly improving production efficiency and product consistency.

[0147] Please refer to Figure 3 and Figure 4The cover discharging device 10 includes a first frame 11, a stacking mechanism 12 arranged on the first frame 11, a bottom conveying mechanism 13 arranged below the stacking mechanism 12 and used to support and convey the covers along the X direction, and a discharging mechanism 14 arranged on the X side of the stacking mechanism 12 and located above the bottom conveying mechanism 13; the discharging mechanism 14 includes a cover guiding component located at the lower part thereof; the bottom conveying mechanism 13 includes a plurality of first conveying units 131 arranged at intervals along the Y direction and capable of synchronously changing the spacing; the cover guiding component cooperates with the first conveying unit 131 to sequentially extract the cover 90 at the bottom of the supported stacked covers 90 along the X direction and convey and discharge the cover. The stacking mechanism 12 supports the stacked covers 90 and conveys them along the X-axis to the stacking channel 120. The multiple first conveying units 131 of the bottom conveying mechanism 13 synchronously adjust their spacing in the Y-axis to accommodate the width of the covers 90 while supporting the bottom of the stacked covers 90. The cover guide components of the discharge mechanism 14 work in conjunction with the first conveying units 131. Through friction between the guide components and the bottommost covers 90, the bottommost cover 90 in the stack is continuously extracted along the X-axis. Simultaneously, the upper covers 90 automatically drop down under gravity to replenish the stack, achieving high-speed, single-sheet separation and discharge of the covers 90. This embodiment achieves adaptive support for covers of various specifications through the synchronous spacing adjustment of the first conveying units 131. Combined with the coordinated paper extraction design of the guide components and conveying units, this significantly improves single-sheet separation efficiency and discharge continuity.

[0148] Please refer to Figure 5The stacking mechanism 12 includes a first guide rail 121 provided on the first frame 11 along the X direction, a sliding frame 122 that can slide and adjust its position along the first guide rail 121, a first belt conveyor 123 provided on the sliding frame 122 and used for conveying along the X direction, two centering devices 124 located above the first belt conveyor 123, a unloading guide plate 125 provided below the discharge end of the first belt conveyor 123 and used for guiding the stacked covers to the stacking channel 120, and a second driving device 126 provided on the first frame 11 and used for driving the sliding frame 122 along the X direction; the stacking channel 120 is located below the discharge end of the first belt conveyor 123; the centering device 124 includes a second scissors structure 1241 provided on the sliding frame 122, and a push plate 1242 connected to one end of the second scissors structure 1241, and a positioning channel 1243 with an adjustable spacing is formed between the two push plates 1242. When stacked covers 90 are placed on the first belt conveyor 123, the second scissor structures 1241 of the two centering devices 124 telescopically drive the push plates 1242 toward each other, forming a positioning channel 1243 adapted to the cover width, achieving automatic Y-axis centering of the stack. The first belt conveyor 123 then conveys the centered cover stack along the X-axis to the discharge end, where it is tilted and guided by the unloading guide plate 125 into the stacking channel 120. The second drive device 126 drives the slide 122 to slide along the first guide rail 121, synchronously adjusting the X-axis dimensions of the unloading guide plate 125 and the stacking channel 120 entrance, ensuring precise and limited loading of the cover stack. This structure, through push plate centering and the coordinated adjustment of the belt conveyor and slide, achieves rapid centering, directional conveying, and adaptive channel guidance for stacks of covers of various sizes, improving feeding stability and compatibility.

[0149] Please refer to Figure 6The bottom conveying mechanism 13 also includes a second guide rail 132 arranged on the first frame 11 along the Y direction, two first sliding seats 133 sliding on the second guide rail 132, a first baffle 134 arranged on the first sliding seat 133, a first scissors structure 135 connected between the two first sliding seats 133, a plurality of second sliding seats 136, and a first driving device 138 for driving the two first sliding seats 133 to move toward or oppositely, each second sliding seat 136 slides on the second guide rail 132 and is respectively connected to the first rotating shaft at each intersection position of the first scissors structure 135; the first conveying unit 131 is a second belt conveyor device, and the second belt conveyor device is arranged on the second sliding seat 136; the movement of the first sliding seat 133 causes all the second sliding seats 136 to move synchronously along the Y direction through the first scissors structure 135, thereby synchronously adjusting the spacing of the second belt conveyor device and the spacing between the two first baffles 134. When the first driving device 138 drives the two first sliding seats 133 to move toward each other along the second guide rail 132, the first scissors structure 135 expands and contracts and deforms accordingly, synchronously driving all the second sliding seats 136 connected to its respective cross-rotating shafts to slide equidistantly along the second guide rail 132; this linkage process enables the multiple second belt conveyor devices 131 fixed to the second sliding seat 136 to achieve synchronous adjustment of the Y-direction spacing, and at the same time, the spacing between the two first baffles 134 fixed to the first sliding seat 133 changes accordingly, thereby adapting to the width of the cover 90 stacking and achieving lateral limitation.

[0150] Please refer to Figure 7The discharge mechanism 14 also includes a third sliding seat 142 with adjustable position along the Y direction, a third driving device 145, and a first screw 146 driven by the third driving device 145 and with forward and reverse thread segments; the two third sliding seats 142 respectively form threaded cooperation with the two thread segments of the first screw 146; the third driving device 145 drives the two third sliding seats 142 to move synchronously in opposite directions or reverse directions along the Y direction by driving the first screw 146 to rotate; the cover guiding component includes an arc-shaped guide plate 143 fixed on the third sliding seat 142, and a guide wheel 144 arranged in the middle of the arc-shaped guide plate 143 and with the lower end passing through the arc-shaped guide plate 143. The arc-shaped guide plate 143 and the guide wheel 144 are used to guide the cover 90 at the bottom of the stack of covers to be transported out in sequence along the X direction. The third drive mechanism 145 rotates the first screw 146, which, through its forward and reverse thread segments, drives the two third slides 142 to move synchronously in opposite directions along the Y-direction. This allows the curved guide plate 143 and guide wheel 144, fixed to the third slide, to be precisely adjusted to the width of the cover 90. During operation, the second belt conveyor 131 of the bottom conveyor mechanism 13 supports the stacked covers 90 and conveys them along the X-direction. Simultaneously, the lower end of the guide wheel 144 passes through the curved guide plate 143 and contacts the bottommost cover 90. Frictionally, the second belt conveyor 131 cooperates with the second belt conveyor 131 to continuously extract the bottom cover 90 along the X-direction trajectory of the curved guide plate 143. The upper cover 90 automatically drops down under gravity to replenish the stack. This structure achieves adaptive guide positioning and high-speed continuous separation of covers according to their width, improving discharge efficiency and dimensional compatibility.

[0151] Please refer to Figure 7 The cover discharge device 10 also includes an inclined conveying mechanism 15, which includes an inclined guide plate 151 provided on the X-direction output side of the discharge mechanism 14, two lifting seats 152 fixed to the first frame 11 and located on both sides of the inclined guide plate 151 in the Y-direction, and multiple groups of third belt conveyor devices 153, which are arranged along the Y-direction; the two ends of each group of third belt conveyor devices 153 are respectively connected to the two lifting seats 152 in a liftable manner; the lifting seats 152 are used to synchronously adjust the lifting height of all third belt conveyor devices 153 relative to the inclined guide plate 151; when the third belt conveyor device 153 is lowered, the lower end surface of its belt is parallel to the upper end surface of the inclined guide plate 151, together forming an inclined conveying path. After being extracted along the X-axis by the discharge mechanism 14, the cover 90 falls onto the surface of the inclined guide plate 151. The lifting platform 152 simultaneously lowers all third belt conveyors 153, causing their lower belt ends to become coplanar with the upper ends of the inclined guide plates 151, forming an inclined conveying path. At this point, the third belt conveyors 153 are activated, and the friction between their belts and the inclined guide plates 151 drives the cover 90 smoothly along an oblique path to the cover transfer mechanism 20. This mechanism, through the dynamic fit between the elevating conveyor belt and the fixed inclined plate, achieves buffered guidance and seamless transition from cover discharge to transfer, effectively preventing jams and accommodating the conveyance of covers of varying thicknesses.

[0152] Please refer to Figures 8 to 10 The second conveying unit 21 includes a second frame 211, a plurality of first supporting frames 212 arranged on the second frame 211, a third guide rail 213 arranged on the first supporting frame 212 along the X direction, and a book pushing mechanism 214 slidably arranged on the third guide rail 213; the book pushing mechanism 214 includes a fourth sliding seat 215 that slides with the third guide rail 213, a plurality of blocking blocks 216 pivotally connected to the fourth sliding seat 215 and spaced apart along the X direction, a pull rod 217 for simultaneously driving one end of all blocking blocks 216 to flip up or flip down for storage, a fourth driving device 218 fixed to the fourth sliding seat 215 and driving the pull rod 217, and a fifth driving device 219 provided on the second frame 211 and used to drive the book pushing mechanism 214 to reciprocate along the X direction; the height of the blocking block 216 after flipping up is higher than the height of the first supporting frame 212. When the cover 90 is transferred to the first support bracket 212, the fourth drive device 218 drives the pull rod 217 to simultaneously pull the one end of all the blocking blocks 216 upward (higher than the first support bracket 212), accurately blocking the cover 90. The fifth drive device 219 drives the book pushing mechanism 214 to move along the third guide rail 213 to the next workstation, and multiple blocking blocks 216 push the cover 90 to move synchronously. After reaching the target position, the blocking blocks 216 flip down and are stored, and the book pushing mechanism 214 resets. This design decouples the blocking action from the transfer speed through the pull rod 217, ensuring reliable blocking under low-speed conditions. Multiple blocking blocks 216 work together to achieve continuous and synchronous push of covers, improving transfer efficiency and positioning accuracy.

[0153] It should be noted that the fourth drive device 218 can be a pneumatic cylinder. The cylinder's operating speed is independent of the production line's transmission speed, providing a fast and controllable response. Regardless of the overall line speed, the cylinder can instantly drive the pull rod 217 through pneumatic pressure control to achieve the synchronous upward blocking or downward evasive movement of all the blocking blocks 216.

[0154] Please refer to Figure 8The blocking block 216 includes a rotating portion 2161 and a pulling portion 2162. The rotating portion 2161 is pivotally connected to the fourth sliding seat 215 via the second rotating shaft 220, and the pulling portion 2162 is pivotally connected to the pull rod 217 via the third rotating shaft 221. The fourth sliding seat 215 is fixed with a limiting shaft 222, and the blocking block 216 is provided with an arc-shaped guide hole 223 for the limiting shaft 222 to slide. When the fourth driving device 218 drives the pull rod 217 to move, the pull rod 217 pulls the pulling portion 2162 of the blocking block 216 via the third rotating shaft 221, causing the blocking block 216 to rotate about the second rotating shaft 220. Simultaneously, the limiting shaft 222 fixed to the fourth sliding seat 215 slides along the arc-shaped guide hole 223 of the blocking block 216, forcibly constraining the flipping angle of the blocking block 216 through the arc trajectory, ensuring that all blocking blocks 216 simultaneously complete the precise upward tilt (blocking the cover 90) or downward tilt (avoiding the cover 90). This structure realizes the synchronous and stable flipping of the multiple blocking blocks 216 through the linkage of mechanical limit and rotating shaft, eliminates the movement deviation, and ensures reliable positioning under high and low speed working conditions.

[0155] Please refer to Figure 10 The second conveying unit 21 also includes a spacing adjustment mechanism 224, which includes a second screw 225 with positive and negative threaded segments, a threaded sleeve 226 respectively fixed to the first supporting brackets 212 on both sides, a fourth guide rail 227 fixed to the second frame 211, and a sixth driving device 228 provided on the second frame 211 and used to drive the second screw 225 to rotate. The two threaded sleeves 226 are respectively threadedly engaged with the two threaded segments of the second screw 225; the lower end of the threaded sleeve 226 is slidably engaged with the fourth guide rail 227; a limit module is provided on the edge of the second frame 211, and the limit module includes a plurality of side wheels 230 arranged at intervals along the X direction for positioning the side of the cover 90. When the spacing needs to be adjusted, the sixth drive device 228 drives the second screw 225 to rotate, and synchronously drives the two threaded sleeves 226 to slide in opposite directions along the fourth guide rail 227 through the positive and negative thread segments, driving the first supporting brackets 212 on both sides to move toward or away from each other, thereby realizing adaptive adjustment of the coverage width of the book pushing mechanism 214; when transferring the cover 90, multiple side wheels 230 are equidistantly distributed along the X direction, continuously contacting the side edges of the cover 90, constraining its Y-direction offset, and avoiding displacement.

[0156] Please refer to Figure 11 and Figure 12The glue printing device 30 includes vertical plates 31 fixed on both sides of the second conveying unit 21Y, a printing roller 32 rotatably arranged between the two vertical plates 31, a side flap 33 hinged at one end to the vertical plate 31, a glue coating roller 34 rotatably arranged between the two side flaps 33 and parallel to the printing roller 32, a glue groove 35 arranged between the two side flaps 33 and cooperating with the glue coating roller 34, and a telescopic drive 36 connected between the vertical plates 31 and the side flaps 33, wherein the telescopic drive 36 is used to drive the side flap 33 to rotate around its hinge point to adjust the angle, thereby adjusting the size of the gap between the glue coating roller 34 and the printing roller 32. When the cover 90 passes beneath the printing roller 32, the telescopic actuator 36 rotates the side flap 33 about its hinge point, synchronously adjusting the gap between the gluing roller 34 and the printing roller 32. One end of the gluing roller 34 dips into the glue tank 35 to absorb the glue, then contacts the printing roller 32 to transfer the glue. The printing roller 32 rotates, evenly coating the surface of the cover 90 with glue. This structure, through the angular linkage of the side flap 33, enables precise adjustment of the gap between the two rollers, adapting to varying glue layer thickness requirements and ensuring uniform gluing.

[0157] Please refer to Figures 13 to 15 , a reverse thrust device 80 is provided under the mounting station, and the reverse thrust device 80 includes a positioning plate 81, a driving assembly 82, a pushing assembly 83 and a guiding assembly 84: a movable hole is provided on the positioning plate 81 which passes through the upper and lower parts; the driving assembly 82 includes a seventh driving device 821 installed on the positioning plate 81, a fourth rotating shaft 822 which is transmission-connected to the seventh driving device 821, and a cam 823 which is coaxially fixedly connected to the fourth rotating shaft 822; the pushing assembly 83 includes a movable hole which can move in the movable hole in the left-right direction and the up-down direction. The fourth support frame 831, the pushing piece 832 fixed to the upper end of the fourth support frame 831, and the roller 833 rotatably installed at the lower end of the fourth support frame 831; the roller 833 rolls along the surface of the cam 823 to drive the pushing piece 832 to reciprocate in an oblique direction; the guide assembly 84 includes a first vertical plate 841 fixed to the bottom of the positioning plate 81, an inclined guide rail 842 fixed on the first vertical plate 841, and a first slider 843 fixed on the fourth support frame 831 and slidingly engaged with the inclined guide rail 842. When cover 90 overtravels past the laminating station, pusher 832 blocks cover 90. Seventh drive mechanism 821 drives fourth shaft 822, which in turn rotates cam 823, pushing roller 833 upward. This causes fourth support frame 831 to move along an oblique trajectory, constrained by first slider 843 and inclined guide rail 842. This drives pusher 832 to apply an oblique, rearward, counter-thrust force to cover 90, precisely resetting it to the laminating position. After resetting, elastic return member 844 pulls fourth support frame 831 back to its original position, keeping roller 833 in close contact with cam 823. This mechanism diverts the reaction force to the frame via inclined guide rail 842, significantly reducing wear on cam 823. The oblique trajectory ensures accurate positioning of cover 90 and long-term stability of the mechanism.

[0158] Furthermore, the cam 823 is a fan-shaped structure. An elastic reset member 844 is connected between the fourth support frame 831 and the first vertical plate 841. The elastic reset member 844 is used to maintain stable contact between the roller 833 and the cam 823. The pusher 832 includes a transverse plate 8321 fixed to the fourth support frame 831, a plurality of second support brackets 8322 spaced apart on the transverse plate 8321 along the front-to-back direction, and a pusher plate 8323 fixed to the second support bracket 8322. The pusher plate 8323 is an L-shaped structure. When the fan-shaped cam 823 rotates, its thick curvature portion pushes the roller 833 upward. The fourth support frame 831 drives the pusher 832 to move obliquely backward through the constraint of the inclined guide rail 842. The L-shaped pusher plate 8323 accurately pushes the overtravel cover 90 back to its original position. When the cam rotates to the thin curvature portion, the elastic reset member 844 pulls the fourth support frame 831 to reset and keep the roller 833 in contact with the cam. Multiple push plates 8323 are spaced along horizontal plate 8321 to form a three-point positioning mechanism. The L-shaped vertical edge blocks cover 90 and disperses contact stress. A fan cam optimizes the thrust transmission path, while an elastic return element maintains smooth movement. The multiple push plates work together to ensure a stable and non-deflecting position for cover 90, significantly improving positioning accuracy and mechanical durability.

[0159] It should be noted that the inclined guide rail 842 of this embodiment is the core guide structure of the reverse thrust device 80, which is fixed on the first vertical plate 841 and has a specific inclination angle. When the cam 823 pushes the roller 833, the inclined guide rail 842 forcibly constrains the movement trajectory of the fourth support frame 831 through the first slider 843, so that it moves strictly along the oblique path (with both horizontal reverse components and vertical components). This design transmits the huge reaction force generated when the pusher 832 contacts the cover 90 directly from the first slider 843 to the rigidly fixed inclined guide rail 842, and then distributes it to the frame structure of the first vertical plate 841 and the positioning plate 81, rather than being directly borne by the cam 823. The cam 823 only needs to provide a small amount of power to drive the roller 833 to rotate and the force to overcome the friction of the system, which significantly reduces cam wear. The rigid guidance of the inclined guide rail also ensures that the oblique movement trajectory of the pusher 832 is accurate and stable, fundamentally solving the problem of cover overtravel reset and extending the life of the device.

[0160] Please refer to Figures 16 to 17The book block mounting device 40 includes a book block loading mechanism 41, a pressing mechanism 42 and a buffer adjustment mechanism 43; wherein the book block loading mechanism 41 includes a third conveying unit 411 located on one side above the second conveying unit 21 and conveying the book block along the Y direction, an inclined guiding device 412 provided at the discharge end of the third conveying unit 411, a book block feeding device 413 provided at the discharge end of the inclined guiding device 412, and a translation component 414 for adjusting one of the vertical plates 4131 along the X direction; the inclined guiding device 412 includes a first inclined slide 4121 provided below the discharge end of the third conveying unit 411 and connected to the conveying channel 4132, a second inclined slide 4121 provided on one side of the first inclined slide 4121 and used to push the book block into the conveying channel 4132 along the Y direction A pushing device 4122; the book block feeding device 413 includes two vertical plates 4131 mounted above the second conveying unit 21, and a conveying channel 4132 formed between the two vertical plates 4131 and with an adjustable spacing; the translation assembly 414 includes a rack 4141 provided on the Y side of the second conveying unit 21, a first gear engaged with the rack 4141, a connecting column 4143 coaxially transmitted with the first gear, a third driver 4144 for driving the connecting column 4143 to rotate, a bearing 4145 fixed to the vertical plate 4131 and sleeved on the connecting column 4143, and a first slide rail 4146 arranged along the X direction, a second slider 4147 is provided on the first slide rail 4146, and the first gear rotates on the second slider 4147. The book block is conveyed along the Y-axis by the third conveyor unit 411 to the discharge end, where it falls onto the first inclined slide 4121 for buffering and deflection. The first pusher 4122 pushes the book block along the Y-axis into the conveying channel 4132. To accommodate different book block widths, the third driver 4144 rotates the connecting column 4143, driving the first gear to roll along the rack 4141. Simultaneously, the second slider 4147 slides along the first slide rail 4146, driving the vertical plate 4131 to precisely move along the X-axis, adjusting the width of the conveying channel 4132. This mechanism, through the rigid transmission of the gear rack and slide rail, enables rapid and precise adjustment of the book block's conveying posture and channel width, ensuring damage-free book block feeding and compatibility with multiple book block sizes.

[0161] Furthermore, the pressing mechanism 42 includes two pressing devices 421, one mounted on each of the two uprights 4131. The pressing devices 421 include a mounting plate 4211 fixed to the uprights 4131, a first driver 4212 fixed to the mounting plate 4211, and a first pressing plate 4213 connected to the output end of the first driver 4212 and used to press the book block in the conveying channel 4132 along the Z-direction to the upper end of the cover conveyed by the second conveying unit 21. When the book block is transferred through the conveying channel 4132 to the top of the laminating station, the first driver 4212 drives the first pressing plate 4213 to press vertically downward in the Z-direction, precisely pressing the book block to the gluing area of ​​the cover 90 below. Simultaneously, the reverse thrust device 80 operates synchronously to ensure that the cover 90 does not overtravel or misalign, achieving stable bonding between the book block and the cover 90. This mechanism, through the coordinated control of vertical downward force and cover positioning, ensures precise and offset laminating, significantly improving bonding reliability.

[0162] Furthermore, the buffer adjustment mechanism 43 includes a second driver 431 fixed to a mounting plate 4211 of one of the pressing devices 421 and driven along the Z direction, a fifth sliding seat 432 connected to the output end of the second driver 431, a lower extension arm 433 fixed to the lower end of the fifth sliding seat 432, a mounting rod 434 provided on the lower extension arm 433, and a plurality of buffer members 435 arranged on the mounting rod 434 at intervals along the Y direction; the buffer member 435 includes a connecting plate 4351 fixed to the mounting rod 434, an elastic arm 4352 connected to the connecting plate 4351, and a contact plate 4353 connected to one end of the elastic arm 4352 and arranged toward the conveying channel 4132; one side of the book block in the conveying channel 4132 is abutted against the contact plate 4353. When the book block reaches the end of the conveyor channel 4132, its side surface fully contacts the contact plate 4353 of the buffer 435. The elastic arm 4352 deforms under pressure, providing continuous elastic support to prevent the book block from slipping or shifting. The second actuator 431 drives the fifth sliding seat 432 up and down in the Z direction, adjusting the overall height of the buffer 435 to ensure precise contact with book blocks of varying thicknesses. When the first pressure plate 4213 presses down on the book block, the contact plate 4353 simultaneously elastically retracts to avoid it. This mechanism, through surface-contact elastic buffering and adaptive height adjustment, eliminates the risk of book block positioning deviation and indentation, ensuring precise mounting.

[0163] Please refer to Figures 18 to 20The cover folding device 50 includes a cover flipping mechanism 51 of the cover flipping mechanism 51, and a cover pushing mechanism 52 arranged behind the cover flipping mechanism 51 along the cover conveying direction; wherein, the cover flipping mechanism 51 includes a gantry 511 fixed on the first supporting frame 212, a plurality of second gears 513 rotatably mounted in the gantry 511 through a fifth rotating shaft 512 and meshed in sequence, and an eccentric cam 514 coaxially fixed with each second gear 513; the eccentric cam 514 is provided with a fan-shaped protrusion 5141, a cam 5141 which can be lifted and moved above the gantry 511 A lifting push block 515, a limiting column 516 fixed under the lifting push block 515 and periodically rolling and abutting against the raised portion 5141 of the eccentric cam 514, a return spring arranged in the gantry 511 and used to drive the lifting push block 515 to return downward, and a drive motor 518 for driving any fifth rotating shaft 512; the raised portion 5141 is composed of an arc top surface located at the top arc length and guiding inclined surfaces with the same arc and consistent length connected to both sides of the top surface; the eccentric cams 514 arranged in sequence along the cover conveying direction have the raised portions 5141 of which the arc length at the top increases in sequence. The drive motor 518 drives the fifth rotating shaft 512, driving the multiple meshing second gears 513 to rotate synchronously, causing the raised portion 5141 of the eccentric cam 514 to sequentially push against the stopper 516. The arc-shaped top surface of the raised portion 5141 and the guiding slope push the lifting block 515 upward in the Z direction. Its top surface lifts the portion of the cover 90 not bonded to the book block in a progressive wave-like trajectory. The front cam 514 first pushes the initial edge of the cover 90 upward at a small angle. The rear cam 514, due to its increasing top arc length, maintains the thrust for a longer period, forming a continuous folding arc. The return spring pulls the lifting block 515 back to its original position after the cam 514 disengages. This mechanism, through the incremental cam assembly, achieves progressive, cushioned folding of the cover 90, eliminating local stress concentration and indentation, ensuring damage-free folding of the cover during high-speed continuous operation.

[0164] like Figure 19 As shown, the eccentric cam 514 is fixed to the second gear 513 by at least two positioning pins; the double-point fixation provides better stability.

[0165] Please refer to Figure 20The cover flipping mechanism 51 also includes an arch frame 525 fixed on the second conveying unit 21, a first lifting device 526 fixed on the top of the arch frame 525 and driven to lift along the Z direction, a lifting plate 527 connected to the output end of the first lifting device 526, first pressing wheels 528 arranged at intervals along the X direction at the lower end of the lifting plate 527, a beam 530 connected to one end of the lifting plate 527 through a connecting rod 529, and second pressing wheels 531 arranged at intervals along the X direction at the lower end of the beam 530. The first pressing wheel 528 is used to limit the middle position of the cover 90 in the Z direction; the second pressing wheel 531 is used to limit the edge position of one end of the cover 90 in the Z direction. When the lifting block 515 of the cover-flipping mechanism 51 raises the cover 90, the first lifting device 526 drives the lifting plate 527 downward in the Z direction, causing the first pressure roller 528 to simultaneously press the center region of the cover 90. Simultaneously, the connecting rod 529 drives the crossbeam 530 downward in a coordinated manner, causing the second pressure roller 531 to press the edge region of the cover 90. The dual pressure roller assembly provides zoned elastic pressure during the folding process. The first pressure roller 528 limits deformation of the center region of the cover 90, while the second pressure roller 531 prevents warping and displacement of the edges. This design, through zoned follow-up pressure, achieves dynamic and stable constraint during the folding process of the cover 90, eliminating wrinkles and offset, and ensuring a smooth and precise folding action.

[0166] Please refer to Figure 21 The cover lifting mechanism 52 includes a flap 522 rotatably mounted on the first support bracket 212 via a pivot 521, and a second pushing device 523 fixed to the first support bracket 212 and configured to push one end of the flap 522 upward, causing it to flip about the pivot 521. The flap 522 receives the cover 90 initially flipped by the cover lifting mechanism 51 and flips it into a hinged state. After the cover lifting mechanism 51 lifts the starting edge of the cover 90 to an inclined state, the second pushing device 523 vertically pushes against the free end of the flap 522, forcing the flap 522 to flip upward from a horizontal position about the pivot 521. The flap 522 receives the flipped portion of the cover 90 and continues to push the half not bonded to the book block along an arc to a vertical state. Simultaneously, the portion of the cover 90 bonded to the book block is stably held by the first support bracket 212, ultimately forming a hinged state that completely covers the book block. This mechanism works together with the flipping mechanism 51 to complete the progressive folding of the cover, achieving efficient transition through rigid pushing combined with pivot rotation. The movements are smooth and interference-free, ensuring that the cover is folded 90 degrees without damage.

[0167] Furthermore, a pre-pressing mechanism 54 is provided on the opposite side of the cover pushing mechanism 52. The pre-pressing mechanism 54 includes a first support frame 541 fixed to the second conveying unit 21, a second lifting device 542 fixed to the top of the first support frame 541 and driven to rise and fall in the Z direction, and a pressure rod 543 connected to the output end of the second lifting device 542. When the cover pushing mechanism 52 folds the cover 90 to a position close to the hinge, the second lifting device 542 drives the pressure rod 543 to press downward in the Z direction, applying vertical pressure on the side opposite the fold line of the cover 90 (the end edge of the cover not bonded to the book core); the pressure rod 543 and the first pressure wheel 528 of the cover flipping mechanism 51 form a symmetrical pressing, and simultaneously compact both sides of the fold line in the final stage of the folding and forming of the cover 90. The end pre-pressing locks the folded shape of the cover 90, ensuring that the cover 90 is completely fitted to the book core without any gaps, and providing a semi-finished product with a stable shape for the subsequent flat pressing process.

[0168] Please refer to Figure 18 The flattening device 60 includes a second support frame 61 fixed to the second conveyor unit 21, a third lifting device 62 fixed to the top of the second support frame 61 and driven up and down in the Z direction, and a second pressing plate 63 connected to the output end of the third lifting device 62. When the semi-finished product, in which the cover 90 and the book block are folded into a hinged shape, is transferred to the flattening station, the third lifting device 62 drives the second pressing plate 63 to press down vertically, applying continuous and balanced pressure to the semi-finished cover, forcibly eliminating the gap between the cover and the book block and compacting the adhesive surface, ultimately pressing the semi-finished product into a flat finished book. This device achieves efficient and stable cover-book block integrated pressing through its rigid pressing plate and vertical pressure design.

[0169] Please refer to Figure 22 The fully automatic forming machine for children's card book covers also includes a pressing device 70 provided on one side of the flat pressing device 60 along the X direction. The pressing device 70 includes a third support frame 71 fixed on the second conveying unit 21, a fourth lifting device 72 fixed on the top of the third support frame 71 and driven to rise and fall along the Z direction, a first pressing strip 73 connected to the output end of the fourth lifting device 72, and a second pressing strip 74 fixed on the second conveying unit 21 and located directly below the first pressing strip 73. The first pressing strip 73 is used to press an upper dent on the upper end of the bend of the folding cover 90; the second pressing strip 74 is used to press a lower dent on the lower end of the bend of the folding cover 90. When the book, formed by pressing the cover 90 and the book block together, is transferred to the edge pressing station via the second conveyor unit 21, the fourth lifting device 72 drives the first pressing bar 73 to press vertically downward, collaborating with the second pressing bar 74 fixed to the conveyor unit to clamp the bend of the cover 90 (the spine). The upper and lower pressing bars simultaneously apply balanced pressure, creating a precise upper indentation on the upper surface of the bend of the cover 90 and a symmetrical lower indentation on the lower surface. This device, through the opposing forces of the two pressing bars, forms a physical crease reinforcement, significantly improving the durability of the bend of the cover 90 and the smoothness of opening and closing, ensuring that the finished book does not deform after repeated opening and closing.

[0170] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. Children's card book cover automatic forming machine, characterized by: The invention comprises a cover discharging device (10), a cover conveying device (20) provided at the discharging end of the cover discharging device (10) and conveying in the X direction, a glue printing device (30), a book block mounting device (40), a cover folding device (50), and a flat pressing device (60) sequentially provided along the conveying direction of the cover conveying device (20); The cover discharging device (10) comprises a first frame (11), a stacking mechanism (12) arranged on the first frame (11), a bottom conveying mechanism (13) arranged below the stacking mechanism (12) and used for supporting and conveying covers along the X direction, and a discharging mechanism (14) arranged on one side of the stacking mechanism (12) in the X direction and located above the bottom conveying mechanism (13); the discharging mechanism (14) comprises a cover guiding component located at the lower part thereof; the bottom conveying mechanism (13) comprises a plurality of first conveying units (131) arranged at intervals along the Y direction and capable of synchronously changing the spacing; the cover guiding component cooperates with the first conveying unit (131) to sequentially extract the bottom cover (90) of the supported stacked covers (90) along the X direction and convey the cover out; The cover transfer device (20) comprises a plurality of second conveying units (21) sequentially arranged along the X direction, and the second conveying units (21) are used to convey the cover (90) along the X direction; A glue printing station is provided above one of the second conveying units (21), and the glue printing device (30) is provided at the glue printing station for printing glue on the cover (90) conveyed on the second conveying unit (21); A mounting station is provided above one of the second conveying units (21), and the book block mounting device (40) is provided at the mounting station for mounting the book block on the cover (90); A folding station is provided above one of the second conveying units (21), and the cover folding device (50) is provided at the folding station for folding the cover (90); A flat pressing station is provided above one of the second conveying units (21), and the flat pressing device (60) is provided at the flat pressing station and is used for pressing the cover (90) and the book block into shape.

2. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: The stacking mechanism (12) comprises: a first guide rail (121) provided on the first frame (11) along the X direction; a sliding frame (122) capable of sliding along the first guide rail (121) to adjust its position; a first belt conveyor (123) provided on the sliding frame (122) and used for conveying along the X direction, wherein a stacking channel (120) is provided below the discharge end of the first belt conveyor (123); The bottom conveying mechanism (13) further comprises: a second guide rail (132) provided on the first frame (11) along the Y direction; two first sliding seats (133) sliding on the second guide rail (132); Each of the first sliding seats (133) is provided with a first baffle (134); a first scissor structure (135) connected between the two first sliding seats (133); a plurality of second sliding seats (136), each second sliding seat (136) slides on the second guide rail (132) and is respectively connected to the first rotating shaft at each intersection position of the first scissor-fork structure (135); The first conveying unit (131) is a second belt conveying device, and the second belt conveying device is arranged on the second sliding seat (136); a first driving device (138) for driving the two first sliding seats (133) to move toward or away from each other; the movement of the first sliding seat (133) causes all the second sliding seats (136) to move synchronously along the Y direction through the first scissor structure (135), thereby synchronously adjusting the spacing between the second belt conveyor devices and the spacing between the two first baffles (134); The discharging mechanism (14) further includes a third sliding seat (142) whose position is adjustable along the Y direction; The cover guide component comprises an arc-shaped guide plate (143) fixed on the third sliding seat (142), and a guide wheel (144) arranged in the middle of the arc-shaped guide plate (143) and with its lower end passing through the arc-shaped guide plate (143); the arc-shaped guide plate (143) and the guide wheel (144) are used to guide the cover (90) at the bottom layer of the stacked covers to be transported out in sequence along the X direction.

3. The fully automatic forming machine for children's card covers according to claim 2, characterized in that: The stacking mechanism (12) further includes two centering devices (124) located above the first belt conveyor device (123); the centering device (124) includes a second scissor-type structure (1241) provided on the sliding frame (122), and a push plate (1242) connected to one end of the second scissor-type structure (1241), wherein a positioning channel (1243) with an adjustable spacing is formed between the two push plates (1242); The stacking mechanism (12) further comprises: a material discharge guide plate (125), provided below the discharge end of the first belt conveyor (123), for guiding the stacked covers to the stacking channel (120); A second driving device (126), provided on the first frame (11), for driving the sliding frame (122) along the X direction; The discharging mechanism (14) further comprises: a third drive device (145); a first screw (146) with forward and reverse thread segments, driven by the third driving device (145); The two third sliding seats (142) respectively form threaded engagement with the two threaded sections of the first screw (146); the third driving device (145) drives the first screw (146) to rotate, thereby driving the two third sliding seats (142) to move synchronously in opposite directions or in opposite directions along the Y direction; The cover discharging device (10) further includes an oblique conveying mechanism (15), and the oblique conveying mechanism (15) includes: An oblique guide plate (151) is provided on the X-direction output side of the discharging mechanism (14); Two lifting seats (152) are fixed to the first frame (11) and are located on both sides of the oblique guide plate (151) in the Y direction; A plurality of third belt conveyor devices (153) are arranged in an array along the Y direction; Both ends of each group of third belt conveyor devices (153) are respectively connected to the two lifting seats (152) in a liftable manner; The lifting seat (152) is used to synchronously adjust the lifting height of all the third belt conveying devices (153) relative to the oblique guide plate (151); When the third belt conveyor (153) is lowered, the lower end surface of its belt is parallel to the upper end surface of the oblique guide plate (151), and together they form an oblique conveying path.

4. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: The second conveying unit (21) comprises a second frame (211), a plurality of first supporting frames (212) arranged on the second frame (211), a third guide rail (213) arranged on the first supporting frame (212) along the X direction, and a book pushing mechanism (214) slidingly arranged on the third guide rail (213); the book pushing mechanism (214) comprises a fourth sliding seat (215) slidingly matched with the third guide rail (213), a plurality of first supporting frames (212) arranged on the second frame (211), a third guide rail (213) arranged on the first supporting frame (212) along the X direction, and a book pushing mechanism (214) slidingly arranged on the third guide rail (213); the book pushing mechanism (214) comprises a fourth sliding seat (215) slidingly matched with the third guide rail (213), a plurality of first supporting frames (212) pivotally connected to the fourth sliding seat (215) and spaced apart along the X direction. A plurality of blocking blocks (216), a pull rod (217) for simultaneously driving one end of all blocking blocks (216) to flip up or flip down for storage, a fourth driving device (218) fixed to the fourth sliding seat (215) and driving the pull rod (217), and a fifth driving device (219) provided on the second frame (211) and used for driving the book pushing mechanism (214) to reciprocate along the X direction; the height of the blocking block (216) after flipping up is higher than the height of the first supporting bracket (212).

5. The fully automatic forming machine for children's card covers according to claim 4, characterized in that: The blocking block (216) is provided with a rotating portion (2161) and a pulling portion (2162); the rotating portion (2161) is pivotally connected to the fourth sliding seat (215) via a second rotating shaft (220), and the pulling portion (2162) is pivotally connected to the pull rod (217) via a third rotating shaft (221); a limiting shaft (222) is fixed to the fourth sliding seat (215), and the blocking block (216) is provided with an arc-shaped guide hole (223) for the limiting shaft (222) to slide; The second conveying unit (21) further includes a spacing adjustment mechanism (224), and the spacing adjustment mechanism (224) includes: A second screw (225) with forward and reverse thread segments; Threaded sleeves (226) respectively fixed to the first support brackets (212) on both sides, the two threaded sleeves (226) respectively threadably engaged with the two threaded sections of the second screw rod (225); A fourth guide rail (227) is fixed to the second frame (211), and the lower end of the threaded sleeve (226) is in sliding engagement with the fourth guide rail (227); The second frame (211) is provided with a sixth driving device (228) for driving the second screw (225) to rotate; A limiting module is provided at the edge of the second frame (211), and the limiting module comprises a plurality of side wheels (230) spaced apart along the X direction, and is used for positioning the side edge of the cover (90).

6. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: The rubber printing device (30) comprises: Vertical plates (31) fixed on both sides of the second conveying unit (21) in the Y direction; a printing roller (32) rotatably arranged between the two vertical plates (31); A side flap (33), one end of which is hinged to the vertical plate (31); a glue coating roller (34) rotatably disposed between the two side flaps (33) and parallel to the printing roller (32); A glue groove (35) is provided between the two side flaps (33) and cooperates with the glue coating roller (34); a telescopic driver (36) connected between the vertical plate (31) and the side flap (33); The telescopic driver (36) is used to drive the side flap (33) to rotate around its hinge point to adjust the angle, thereby adjusting the gap between the glue coating roller (34) and the printing roller (32).

7. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: A reverse thrust device (80) is provided below the laminating station, and the reverse thrust device (80) comprises: A positioning plate (81), wherein the positioning plate (81) is provided with a movable hole extending vertically therethrough; A driving assembly (82) includes a seventh driving device (821) mounted on the positioning plate (81), a fourth rotating shaft (822) drivingly connected to the seventh driving device (821), and a cam (823) coaxially fixedly connected to the fourth rotating shaft (822); The pushing assembly (83) includes a fourth support frame (831) movable in the movable hole in the left-right direction and the up-down direction, a pushing member (832) fixed to the upper end of the fourth support frame (831), and a roller (833) rotatably mounted on the lower end of the fourth support frame (831); the roller (833) rolls along the surface of the cam (823) to drive the pushing member (832) to reciprocate in an oblique direction; The guide assembly (84) includes a first vertical plate (841) fixed to the bottom of the positioning plate (81), an inclined guide rail (842) fixed to the first vertical plate (841), and a first slider (843) fixed to the fourth support frame (831) and slidably engaged with the inclined guide rail (842).

8. The fully automatic forming machine for children's card covers according to claim 7, characterized in that: The cam (823) is a fan-shaped structure; An elastic reset member (844) is further connected between the fourth support frame (831) and the first vertical plate (841), and the elastic reset member (844) is used to maintain stable contact between the roller (833) and the cam (823); The pushing member (832) includes a transverse plate (8321) fixed on the fourth support frame (831), a plurality of second support frames (8322) arranged on the transverse plate (8321) at intervals along the front-to-back direction, and a pushing plate (8323) fixed on the second support frames (8322); the pushing plate (8323) is an L-shaped structure.

9. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: The book block mounting device (40) comprises: The book block feeding mechanism (41) comprises: a third conveying unit (411) located above and on one side of the second conveying unit (21) and conveying the book block along the Y direction; an inclined material guiding device (412) provided at the discharge end of the third conveying unit (411); a book block feeding device (413) provided at the discharge end of the inclined guide device (412), the book block feeding device (413) comprising two vertical plates (4131) mounted above the second conveying unit (21), and a conveying channel (4132) formed between the two vertical plates (4131) and having an adjustable spacing; The pressing mechanism (42) comprises two pressing devices (421) respectively provided on the two vertical plates (4131); the pressing devices (421) comprise: a mounting plate (4211) fixed to the vertical plate (4131); a first driver (4212) fixed to the mounting plate (4211); a first pressing plate (4213) connected to the output end of the first driver (4212) and used for pressing the book block in the conveying channel (4132) along the Z direction to the upper end of the cover conveyed by the second conveying unit (21); The buffer adjustment mechanism (43) comprises: a second driver (431) fixed to a mounting plate (4211) of one of the pressing devices (421) and driven in the Z direction; a fifth sliding seat (432) connected to the output end of the second driver (431); A lower extension arm (433) fixed to the lower end of the fifth sliding seat (432); a mounting rod (434) provided on the lower extension arm (433); a plurality of buffer members (435) arranged on the mounting rod (434) at intervals along the Y direction; The buffer member (435) comprises: a connecting plate (4351) fixed to the mounting rod (434); an elastic arm (4352) connected to the connecting plate (4351); a contact plate (4353) connected to one end of the elastic arm (4352) and disposed toward the conveying channel (4132); Wherein, one side of the book block in the conveying channel (4132) abuts against the contact plate (4353).

10. The fully automatic forming machine for children's card covers according to claim 9, characterized in that: The inclined material guiding device (412) comprises a first inclined slide (4121) provided below the discharge end of the third conveying unit (411) and connected to the conveying channel (4132), and a first pushing device (4122) provided on one side of the first inclined slide (4121) and used for pushing the book block into the conveying channel (4132) along the Y direction; The book block loading mechanism (41) also includes a translation assembly (414) for adjusting one of the vertical plates (4131) along the X direction, and the translation assembly (414) includes a rack (4141) provided on the Y side of the second conveying unit (21), a first gear meshed with the rack (4141), a connecting column (4143) coaxially driven with the first gear, a third driver (4144) for driving the connecting column (4143) to rotate, a bearing (4145) fixed to the vertical plate (4131) and sleeved on the connecting column (4143), and a first slide rail (4146) provided along the X direction, a second slider (4147) being provided on the first slide rail (4146), and the first gear rotating on the second slider (4147).

11. The fully automatic forming machine for children's card covers according to claim 4, characterized in that: The cover folding device (50) comprises: The cover flipping mechanism (51) is arranged above the second conveying unit (21) and comprises: a gantry (511) fixed on the first supporting frame (212); A plurality of second gears (513) rotatably mounted in the gantry (511) via a fifth rotating shaft (512) and meshed in sequence; an eccentric cam (514) coaxially fixed to each of the second gears (513); the eccentric cam (514) is provided with a fan-shaped protrusion (5141); the protrusion (5141) is composed of an arc top surface with a long arc length at the top and guiding inclined surfaces with the same arc and length connected to both sides of the top surface; A lifting push block (515) movable above the gantry (511) in a lifting manner; a limiting post (516) fixed below the lifting push block (515) and periodically rolling and abutting against the raised portion (5141) of the eccentric cam (514); a return spring disposed in the gantry (511) and used to drive the lifting push block (515) to return downward; A driving motor (518) for driving any one of the fifth rotating shafts (512); wherein the arc lengths of the tops of the protruding portions (5141) of the eccentric cams (514) arranged in sequence along the cover conveying direction are increased in sequence; The cover pushing mechanism (52) is arranged behind the cover turning mechanism (51) along the cover conveying direction, and comprises: a flap (522) rotatably mounted on the first support bracket (212) via a pivot (521); A second pushing device (523) is fixed to the first supporting bracket (212) and is used to push one end of the flip plate (522) upward to flip it around the pivot (521); the flip plate (522) is used to receive the cover (90) initially flipped up by the cover flipping mechanism (51) and flip it into a hinged state.

12. The fully automatic forming machine for children's card covers according to claim 11, characterized in that: The eccentric cam (514) is fixed to the second gear (513) via at least two positioning pins; The cover turning mechanism (51) further comprises: an arch frame (525) fixed on the second conveying unit (21); A first lifting device (526) fixed to the top of the arch frame (525) and driven to lift in the Z direction; a lifting plate (527) connected to the output end of the first lifting device (526); First pressing wheels (528) are arranged at intervals along the X direction at the lower end of the lifting plate (527), and the first pressing wheels (528) are used to limit the middle position of the cover (90) in the Z direction; A crossbeam (530) connected to one end of the lifting plate (527) via a connecting rod (529); Second pressing wheels (531) are arranged at intervals along the X direction at the lower end of the beam (530), and the second pressing wheels (531) are used to limit the edge position of one end of the cover (90) in the Z direction; A pre-pressing mechanism (54) is further provided on the opposite side of the cover pushing mechanism (52), and the pre-pressing mechanism (54) comprises: a first support frame (541) fixed on the second conveying unit (21); a second lifting device (542) fixed on the top of the first support frame (541) and driven to rise and fall along the Z direction; A pressure rod (543) is connected to the output end of the second lifting device (542).

13. The fully automatic forming machine for children's card covers according to claim 1, characterized in that: The leveling device (60) comprises: a second support frame (61) fixed on the second conveying unit (21); a third lifting device (62) fixed on the top of the second support frame (61) and driven to rise and fall along the Z direction; A second pressing plate (63) is connected to the output end of the third lifting device (62).

14. The fully automatic forming machine for children's business card covers according to claim 1, characterized in that: The fully automatic forming machine for children's card covers further comprises a pressing device (70) provided on one side of the flat pressing device (60) in the X direction, and the pressing device (70) comprises: a third support frame (71) fixed on the second conveying unit (21); a fourth lifting device (72) fixed to the top of the third support frame (71) and driven to lift in the Z direction; a first pressing strip (73) connected to the output end of the fourth lifting device (72), the first pressing strip (73) being used to press an upper indentation on the upper end of the bend of the folding cover (90); A second pressure strip (74) is fixed on the second conveying unit (21) and is located directly below the first pressure strip (73), and the second pressure strip (74) is used to press a lower indentation on the lower end of the bend of the folding cover (90).

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