Turnover automatic feeding device for die cutting machine and feeding method

Abstract

This invention relates to a flip-type automatic feeding device and feeding method for die-cutting machines. The device includes a frame, a lower positioning seat, and a flip-feeding mechanism. The lower positioning seat is linked to a lifting mechanism, and the flip-feeding table is equipped with a self-locking centering paper clamping mechanism. Together with the rotating and lifting components, it realizes the flipping, automatic centering, and vertical conveying of the entire pile of materials. It has high positioning accuracy, is suitable for vertically laid production lines, and greatly improves feeding efficiency and automation.

Description

Technical Field

[0001] This invention relates to die-cutting machines, and more specifically to a flip-type automatic feeding device and feeding method for die-cutting machines. Background Technology

[0002] The feeding device of a die-cutting machine is a core supporting equipment in industries such as printing and packaging, and electronics manufacturing. Its conveying stability directly determines the die-cutting efficiency and product quality. In actual production, paper is usually stacked with the printed side down to avoid scratches, but the die-cutting process requires the printed side to be up to ensure accurate alignment between the die-cut pattern and the printed content. The adhesive side of foam and pads needs to be down when attached to the die-cutting platform, but they are usually placed up during storage to protect the adhesive side. Therefore, it is necessary to flip them over to adjust the orientation of the process surfaces.

[0003] Existing general-purpose automatic feeding equipment, such as the invention patent document with publication number CN108163531B, adopts a multi-mechanism split design, which completes the feeding of a single part through multiple stages of clamping, flipping, pushing, and transfer. However, it has obvious adaptation defects in the flipping feeding scenario of die-cutting machines: it can only handle a single small part and cannot meet the flipping requirements of a whole pile of sheet materials; the multi-stage transfer leads to the accumulation of positioning errors; the flipping process relies on active drive clamping, which cannot maintain self-locking clamping force, resulting in a high rate of material loosening and displacement; the layout based on horizontal transfer cannot be adapted to vertical space production lines, increasing equipment costs and floor space.

[0004] In response to the die-cutting industry's demands for "pile flipping, stable clamping, vertical space adaptation, and high-speed continuous operation," traditional equipment can no longer meet the requirements of high-precision and large-scale production. There is an urgent need for a high-efficiency and precise flipping automatic feeding device specifically designed for die-cutting machines. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a flip-type automatic feeding device for die-cutting machines that achieves automatic flipping feeding, clamping and centering, and is highly efficient and stable.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a flip-type automatic feeding device for a die-cutting machine, comprising a frame, a lower positioning seat disposed below the frame and used to support a material tray, and a flip-feeding mechanism disposed above the lower positioning seat. The lower positioning seat is linked to a lifting mechanism that drives the lower positioning seat to reciprocate along the Z-axis. The flip-feeding mechanism includes a flip-feeding table, a rotating component that drives the flip-feeding table to rotate around the X-axis, and a lifting component that drives the flip-feeding table to reciprocate along the Z-axis. The flip-feeding table is provided with a worktable for supporting paper stacks. The flip-feeding table is linked to a self-locking centering paper clamping mechanism that clamps or releases materials placed on the worktable along the Y-axis.

[0007] By adopting the above technical solution and setting up a flipping feeding mechanism, automatic flipping and conveying of materials are achieved without manual intervention, improving feeding efficiency and automation. The flipping feeding table, in conjunction with rotating and lifting components, can flip and lift the material pile located below to the upper working position, adapting to the spatial layout requirements of different process flows. In particular, the self-locking centering paper clamping mechanism can automatically clamp and center the material during flipping and conveying, ensuring the accuracy of the material position and providing a precise positioning basis for subsequent processes such as die-cutting, effectively avoiding processing errors or equipment failures caused by material misalignment. The entire device has a compact structure, smooth operation, and stable and reliable operation.

[0008] Furthermore, the self-locking centering paper clamping mechanism includes a first clamping plate and a second clamping plate symmetrically arranged along the Y-axis. The first clamping plate is linked to a first self-locking centering component that drives the first clamping plate to move closer to or away from the second clamping plate along the Y-axis. The second clamping plate is linked to a second self-locking centering component that drives the second clamping plate to move closer to or away from the first clamping plate along the Y-axis. The second self-locking centering component has the same structure as the first self-locking centering component. The self-locking centering paper clamping mechanism also includes a first opening and closing control component arranged along the Y-axis at the center of the front side of the frame and a second opening and closing control component arranged along the Y-axis at the center of the rear side of the frame. The first self-locking centering component includes a first fixing plate fixed to the flipping feeding table, a first front positioning plate distributed on one side of the first fixing plate, and a first fixing plate distributed on the first fixing plate. A first rear positioning plate is arranged on the other side of the plate and parallel to the first front positioning plate; the first front positioning plate and the first rear positioning plate are linked and can move back and forth synchronously along the Y-axis; the first self-locking centering assembly also includes a first swing opening and closing member, a first clamping guide groove parallel to the first clamping plate is machined on the first fixed plate, a first sliding member is rotatably connected to one end of the first swing opening and closing member, the first sliding member is inserted into the first clamping guide groove and can move back and forth along the first clamping guide groove, a first guide post is rotatably connected to the middle of the first swing opening and closing member, the lower end of the first guide post is fixed to the first rear positioning plate, the central axis of the first guide post is offset from the center line of the first clamping guide groove, and the other end of the first swing opening and closing member extends in a direction away from the first clamping plate.

[0009] By adopting the above technical solution, and by setting up symmetrical first and second self-locking centering components, and cooperating with the first and second opening and closing control components fixed on the frame, the passive automatic opening, closing, and locking of the paper clamping mechanism is realized. This eliminates the need for a separate active drive source (such as a motor or cylinder) for the paper clamping mechanism, simplifying the structure and reducing costs. In the first self-locking centering component, the ingenious cooperation of the first swing opening / closing member, the first sliding member, the first clamping guide groove, and the first guide post constitutes a lever-driven force amplification and self-locking mechanism. When the free end of the first swing opening / closing member is pushed by the first opening and closing control component, the first sliding member moves within the first clamping guide groove through leverage, driving the first guide post and the first rear positioning plate connected to it to move. Due to the linkage between the first front and rear positioning plates, the first clamping plate is driven to move. Because the center of the first guide post is misaligned with the centerline of the first clamping guide groove, a self-locking mechanism is formed in the clamping state, ensuring the stable maintenance of the clamping force and preventing the material from loosening during flipping and lifting. This structure achieves reliable clamping, centering, and self-locking functions. As a preferred embodiment, the first front positioning plate and the first clamping plate can be directly fixedly connected, and the first rear positioning plate can be fixedly connected to the first front positioning plate through at least one linkage rod passing through a guide hole on the first fixed plate, thereby achieving rigid linkage between the front and rear positioning plates and ensuring the stability of the translation of the first clamping plate. A spring can be sleeved on the linkage rod, with both ends of the spring abutting against the front positioning plate and the fixed plate respectively. When the clamping mechanism is opened, the restoring force of the spring can assist the clamping plate to quickly return to its original position.

[0010] Furthermore, the lower end of the first front positioning plate is fixedly connected to the first clamping plate, and at least one first linkage rod is fixedly connected to the first rear positioning plate. The end of the first linkage rod away from the first rear positioning plate is fixedly connected to the first front positioning plate. The first fixed plate is machined with a first guide hole that is clearance-fitted to each first linkage rod. A first spring is sleeved on the outer periphery of the first linkage rod. The first spring is located between the first front positioning plate and the first fixed plate, and one end of the first spring abuts against the first front positioning plate and the other end of the first spring abuts against the first fixed plate.

[0011] By adopting the above technical solution, the first front positioning plate and the first rear positioning plate are rigidly connected by the first linkage rod, ensuring the synchronicity of their movements and the rigidity of the overall structure. This makes the movement of the first clamping plate smoother and more precise, preventing swaying and ensuring accurate centering and clamping. The first guide hole provides good guidance and support for the first linkage rod. The first spring provides an automatic reset function. When the external opening and closing control component releases the constraint on the first swing opening and closing component, under the elastic force of the first spring, the first front positioning plate can quickly and automatically return the first clamping plate to the open position, preparing for the next clamping action and improving the action response speed and working cycle. At the same time, the preload of the spring can also provide a certain initial clamping force in the early stage of clamping, making the clamping process smoother. This structure enhances the reliability of the mechanism and the determinism of the action.

[0012] Furthermore, the second self-locking centering assembly includes a second fixed plate fixed to the flipping feeding table, a second front positioning plate distributed on one side of the second fixed plate, and a second rear positioning plate distributed on the other side of the second fixed plate and arranged parallel to the second front positioning plate; the second front positioning plate and the second rear positioning plate are linked and can reciprocate synchronously along the Y-axis; the second self-locking centering assembly also includes a second swing opening and closing member, the second fixed plate is machined with a second clamping guide groove parallel to the second clamping plate, one end of the second swing opening and closing member is rotatably connected to a second sliding member, the second sliding member is inserted into the second clamping guide groove and can reciprocate along the second clamping guide groove, the middle part of the second swing opening and closing member is rotatably connected to a second guide post, the lower end of the second guide post is fixed to the second rear positioning plate, the central axis of the second guide post is offset from the center line of the second clamping guide groove, and the other end of the second swing opening and closing member extends in a direction away from the second clamping plate; the first swing opening and closing member and the second swing opening and closing member are respectively arranged on both sides of the Y-axis.

[0013] Using the above technical solution, the second self-locking centering component adopts a structure that is completely symmetrical and identical to the first component, resulting in uniform clamping force on both sides and better centering effect. The first and second swing-opening / closing components are respectively arranged on both sides of the Y-axis (i.e., one facing forward and the other facing backward), allowing them to correspond and cooperate with the first opening / closing control component on the front side of the frame and the second opening / closing control component on the rear side. This layout makes full use of space, allowing the opening / closing control components to be fixed in a stationary part of the frame, while the swing-opening / closing components move with the flip-feed table. The opening and closing control of the clamping mechanism is achieved through the contact and separation generated by the relative movement of the two components in the Z-axis direction. This ingenious design realizes purely mechanical automatic control. The entire clamping and centering system has a symmetrical structure, balanced force, and stable operation.

[0014] Furthermore, the first opening and closing control component includes a first locking plate disposed on the right side of the Y-axis and a first opening plate disposed on the left side of the Y-axis. The first locking plate is located below the first opening plate along the Z-axis direction. The first locking plate includes a first locking surface inclined downward along the Z-axis and a first lower limit surface connected to the lower end of the first locking surface. The first opening plate includes a first opening surface inclined upward along the Z-axis and a first upper limit surface connected to the upper end of the first opening surface. A first chamfer is machined on the lower side of the first locking surface facing the flip-feed table, and a third chamfer is machined on the upper side of the first opening surface facing the flip-feed table. Chamfer; The second opening and closing control component includes a second locking plate disposed on the left side of the Y-axis and a second opening plate disposed on the right side of the Y-axis. The second locking plate is located below the second opening plate along the Z-axis. The second locking plate includes a second locking surface that is inclined downward along the Z-axis and a second lower limit surface that is connected to the lower end of the second locking surface. The second opening plate includes a second opening surface that is inclined upward along the Z-axis and a second upper limit surface that is connected to the upper end of the second opening surface. A second chamfer is machined on the side of the second locking surface facing the flip-feeding table below, and a fourth chamfer is machined on the side of the second opening surface facing the flip-feeding table above.

[0015] By adopting the above technical solution, the specific structural design of the first and second opening and closing control components precisely controls the opening and closing sequence and process of the clamping mechanism. The inclined locking surfaces on the first and second locking plates guide and push the corresponding swinging opening and closing components during the downward movement of the tilting feed table, causing the clamping plate to close and clamp. The lower limit surface at its lower end acts as a limit, ensuring that the clamping is in place and maintained. The inclined opening surfaces on the first and second opening plates push the swinging opening and closing components in the opposite direction during the upward movement of the tilting feed table, causing the clamping plate to open and release the material. The upper limit surface ensures that the opening is in place. The chamfered design on the locking surface allows for smooth entry of the swinging opening and closing components when they come into contact, reducing impact and wear. By staggering the locking plates and opening plates vertically along the Z-axis and combining them with the lifting movement of the tilting feed table, an automated process control of "locking and clamping during downward movement, and opening and releasing when moving to a high position" is achieved, with clear logic and reliable operation. As a preferred embodiment, the first opening and closing control component can be an integral irregularly shaped block fixed to the front side of the frame, which integrates a locking surface and an opening surface with specific contours, and is formed in one step by machining to ensure accuracy and strength.

[0016] Furthermore, a first mounting shaft is provided at the end of the first swing opening and closing member away from the first fixed plate, and a first roller is rotatably provided on the outer periphery of the first mounting shaft; a second mounting shaft is provided at the end of the second swing opening and closing member away from the second fixed plate, and a second roller is rotatably provided on the outer periphery of the second mounting shaft; a plurality of mounting holes are machined on the flipping feeding table, and a rotatable lifting roller is provided in each mounting hole, and the lifting roller is higher than the worktable surface of the flipping feeding table.

[0017] By adopting the above technical solution, mounting shafts with rollers are provided at the ends of the first and second swing opening and closing components, so that when the swing opening and closing components contact the inclined surface of the opening and closing control component, the contact mode changes from sliding friction to rolling friction. This greatly reduces motion resistance, friction loss, and noise, improves the service life and smoothness of the mechanism, and also helps to ensure the accuracy of the action position. Lifting rollers higher than the worktable surface are provided on the flipping feeding table. When the material (paper stack) is placed on the worktable surface or clamped, the bottom of the material contacts the lifting rollers. When the clamping plate clamps the material and may produce slight relative movement for centering, the rotation of the lifting rollers can reduce the friction at the bottom of the material, making the centering process smoother and avoiding material deformation or misalignment due to excessive friction. In addition, when the external robot arm picks up the material, the lifting rollers also facilitate the smooth extraction of the paper.

[0018] Furthermore, the rotating assembly includes a rotating shaft and a first servo motor linked to one end of the rotating shaft. A flipping positioning seat is machined in the lower center of the flipping feeding table. The flipping positioning seat is fixed to the outer periphery of the rotating shaft through a flipping linkage hole. The lifting assembly includes two lifting seats symmetrically arranged at both ends of the rotating shaft. The body of the first servo motor is fixed on one lifting seat. A first lead screw is threaded to one end of the lifting seat, and a second lead screw is threaded to the other end of the lifting seat. The first lead screw and the second lead screw have the same thread direction. A second servo motor is linked to the end of the first lead screw and the end of the second lead screw, respectively. The body of the second servo motor is fixed on the frame.

[0019] Using the above technical solution, the rotating component employs a servo motor to drive the rotating shaft, achieving high control precision and enabling precise 180° rotation and positioning at any angle, meeting the requirements of rotating feeding. The fixed connection between the rotating positioning seat and the rotating shaft ensures reliable torque transmission between the rotating feeding table and the rotating shaft. The lifting component uses two symmetrical lifting seats to support both ends of the rotating shaft, driven by two lead screws with the same direction of rotation. Two second servo motors operate synchronously, ensuring smooth and synchronized vertical lifting of the lifting seats and the entire rotating feeding mechanism, avoiding jamming or tilting. The first servo motor driving the rotation is mounted on the lifting seat, moving with it, simplifying the rotational power transmission path and eliminating the need for complex slip rings or long-distance transmission mechanisms, resulting in a compact and reliable structure. This design achieves independent and precise control of both rotation and lifting degrees of freedom.

[0020] Furthermore, a first cylinder is installed on one side of one of the lifting seats, and the output end of the first cylinder is linked to a first lifting plate. A second cylinder is installed on one side of the other lifting seat, and the output end of the second cylinder is linked to a second lifting plate. The first lifting plate and the second lifting plate are respectively located on both sides of the X-axis, and the ends of the first lifting plate and the second lifting plate are both machined with bevels.

[0021] The above technical solution incorporates cylinder-driven lifting plates on the first and second lifting seats, providing auxiliary lifting or positioning functions for the device. After the tilting feeding platform carries material to the working position, if slight adjustments to the material height or auxiliary support for an external robotic arm are needed, the cylinders can be extended to allow the inclined surfaces of the lifting plates to contact the material support or related components, achieving micro-lifting or auxiliary positioning. The two lifting plates are positioned on either side of the X-axis, providing balanced auxiliary force from both sides. The inclined surface design facilitates insertion and contact. This additional mechanism enhances the adaptability and functionality of the equipment, enabling better integration with downstream equipment.

[0022] Furthermore, the lifting mechanism includes a lifting arm fixed below the lower positioning seat and a triangular swing block arranged parallel to the lifting arm. A slider is fixed to the end of the lifting arm away from the lower positioning seat. The slider is slidably fitted with a slide rail, which is arranged along the Z-axis and fixed to the frame. A lifting arm guide groove is machined on the lifting arm. The lower first end of the triangular swing block is rotatably mounted on the frame. A pull rod is fixed to the upper second end of the triangular swing block. A roller is rotatably connected to the third end of the triangular swing block between the first and second ends. The roller is rotatably mounted in the lifting arm guide groove. A rotatable linkage sleeve is fitted on the pull rod. The linkage sleeve is linked to a third cylinder. The body of the third cylinder is rotatably mounted on the frame. Positioning posts are evenly distributed around the upper perimeter of the lower positioning seat. A matching positioning hole is machined below the material tray corresponding to each positioning post.

[0023] The above technical solution features an ingeniously designed lifting mechanism for the lower positioning seat. A triangular swing block converts the horizontal or tilting force of the cylinder into the vertical lifting motion of the lifting arm, increasing the lifting stroke or reducing effort. The cooperation between the slider and the slide rail ensures that the lifting arm and the lower positioning seat move smoothly and precisely along the Z-axis, achieving high guiding accuracy. Rollers roll within the guide groove of the lifting arm, converting the sliding friction between the swing block and the lifting arm into rolling friction, resulting in flexible movement and minimal wear. The third cylinder is connected to the pulling rod via a linkage sleeve, allowing for a certain degree of swing freedom to adapt to angle changes during the swing of the triangular swing block. A positioning post on the lower positioning seat engages with the positioning hole at the bottom of the material tray, enabling rapid and precise positioning of the material tray. This ensures consistent tray placement each time, guaranteeing the initial accuracy of the upper paper stack position, which is crucial for the precision of the entire automatic feeding process. This lifting mechanism is structurally stable and has a strong load-bearing capacity.

[0024] The feeding method of the automatic tilting feeding device for die-cutting machines described above is characterized by: S1, material pre-stacking: the materials to be die-cut are stacked and placed on the upper surface of the material tray, the material tray is placed on the lower positioning seat, and the lifting mechanism drives the lower positioning seat to rise along the Z-axis to the preset material picking height; S2, tilting feeding table reset: the rotating component drives the tilting feeding table to rotate 180° around the X-axis, so that the worktable surface faces downward; the lifting component drives the tilting feeding table to move downward along the Z-axis until the worktable surface is close to the material pile on the material tray; S3, material clamping and centering: the lower positioning seat and the tilting feeding table move downward synchronously along the Z-axis, the first locking surface of the first opening and closing control component pushes the second swing opening and closing component, and the second locking surface of the second opening and closing control component pushes the first swing opening and closing component, so that... The first and second clamping plates converge along the Y-axis to clamp the material and automatically center it; S4, material flipping and conveying: the rotating component drives the flipping feeding table to rotate 180° in the opposite direction around the X-axis, so that the worktable surface faces upward; the lifting component drives the flipping feeding table to rise along the Z-axis, and the lower positioning seat simultaneously descends to the initial position; S5, material release: when the flipping feeding table rises to the preset height, the first opening surface of the first opening and closing control component pushes the first swing opening and closing component, and the second opening surface of the second opening and closing control component pushes the second swing opening and closing component, so that the first and second clamping plates open outward along the Y-axis to release the material; S6, cyclic feeding: after the external robot arm takes away the material, the flipping feeding table returns to the initial position, and steps S1-S5 are repeated to achieve continuous feeding.

[0025] Using the above technical solution, the feeding method fully and clearly illustrates the workflow and logic of the device of the present invention. The steps are interconnected and highly automated. Starting with the pre-placement of material, the method achieves automatic material grabbing, centering, flipping, and feeding through a series of continuous actions including lifting, flipping, synchronous downward clamping, flipping and lifting, and release upon reaching the desired position. Specifically, step S3 utilizes the synchronous downward movement of the lower positioning seat and the flipping feeding table to ensure no relative displacement between the clamping plate and the material in the Z-axis during clamping, thus achieving stable and complete clamping. In step S5, the clamping mechanism is automatically opened and the material is released precisely through contact with the fixed opening and closing control component during the upward movement. The entire method requires no manual intervention in intermediate steps, is highly efficient, and the clever coordination of the mechanical structure ensures material positioning accuracy and transmission stability, providing continuous, reliable, and high-quality material supply for the die-cutting machine. As a preferred embodiment, in step S3, the synchronous downward movement can be achieved by the control system coordinating the lifting mechanism of the lower positioning seat and the lifting component of the flipping feeding table to ensure that their descent speeds are consistent. In step S4, the lower positioning seat descends to the initial position to make room for operators or auxiliary equipment to quickly replace the empty material carrier.

[0026] The beneficial effects of this invention are as follows: The flip-type automatic feeding device can complete the flipping of an entire pile of sheet materials in one go, without the need for multiple mechanisms to be disassembled and transferred, thus solving the problem that existing equipment can only handle single small parts; the self-locking centering paper clamping mechanism maintains a stable clamping force during the flipping and conveying process, automatically centers the material, has high positioning accuracy, and effectively avoids material deviation and the accumulation of positioning errors; the flipping feeding mechanism, together with the lifting component, can be directly adapted to the vertical space production line of "bottom feeding and top processing", without the need for additional horizontal conveying equipment, saving workshop floor space and equipment costs; the fully automated operation is smooth and efficient, meeting the high-speed continuous operation requirements of large-scale die-cutting production, and the overall structure is compact, stable, and reliable in operation.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the flipping feeding mechanism according to Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the clamping state of the first clamping plate in the first self-locking centering assembly of the present invention; Figure 4 This is a schematic diagram of the first clamping plate in the first self-locking centering assembly of the present invention in the state of material release; Figure 5This is a schematic diagram of the first opening and closing control component and the second opening and closing control component according to Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the material tray above the material tray in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the material tray in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the linkage between the lower positioning seat and the lifting mechanism in Embodiment 1 of the present invention. Figure 1 ; Figure 9 This is a schematic diagram of the linkage between the lower positioning seat and the lifting mechanism in Embodiment 1 of the present invention. Figure 2 ; Figure 10 This is a schematic diagram of step S1 in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of step S3 in Embodiment 2 of the present invention. Figure 1 ; Figure 12 This is a schematic diagram of step S3 in Embodiment 2 of the present invention. Figure 2 ; Figure 13 This is a schematic diagram of step S5 in Embodiment 2 of the present invention.

[0029] Labeling notes: Frame 1; Lower positioning seat 2; Positioning column 21; Tilting feeding mechanism 3; Tilting feeding table 31; Worktable surface 311; Mounting hole 312; Lifting roller 313; Tilting positioning seat 314; Rotating assembly 32; Rotating shaft 321; First servo motor 322; Lifting assembly 33; Lifting seat 331; First lead screw 332; Second lead screw 333; Second servo motor 334; First cylinder 335; First lifting plate 336; Lifting mechanism 4; Lifting arm 41; Lifting arm guide groove 411; Triangular swing block 42; Slider 43; Slide rail 44; Pull rod 45; Roller 46; Linkage sleeve 47; Third cylinder 48; Self-locking centering paper clamping mechanism 5; First clamping plate 51; Second clamping plate 52; First self-locking centering assembly 53; First fixing plate 531; First front positioning plate 532 First rear positioning plate 533; First linkage rod 534; First spring 536; First swing opening and closing component 537; First clamping guide groove 538; First sliding component 539; First guide post 5310; First roller 5312; Second self-locking centering assembly 54; Second swing opening and closing component 541; Second roller 542; First opening and closing control component 55; First locking plate 551; First locking surface 5511; First lower limit surface 5512; First chamfer 5513; First opening plate 552; First opening surface 5521; First upper limit surface 5522; Second opening and closing control component 56; Second locking plate 561; Second locking surface 5611; Second lower limit surface 5612; Second chamfer 5613; Second opening plate 562; Second opening surface 5621; Second upper limit surface 5622. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1: As Figure 1-9 The illustrated automatic tilting feeding device for a die-cutting machine includes a frame 1, a lower positioning seat 2 located below the frame 1 for supporting a material tray, and a tilting feeding mechanism 3 located above the lower positioning seat 2. The lower positioning seat 2 is linked to a lifting mechanism 4 that drives it to reciprocate along the Z-axis for adjusting the height of the material tray.

[0032] The flipping feeding mechanism 3 includes a flipping feeding table 31, a rotating component 32 that drives the flipping feeding table 31 to rotate around the X-axis, and a lifting component 33 that drives the flipping feeding table 31 to reciprocate along the Z-axis. The flipping feeding table 31 is provided with a worktable 311 for supporting paper stacks. The flipping feeding table 31 is also linked to a self-locking centering paper clamping mechanism 5, which can clamp or release the material placed on the worktable 311 along the Y-axis and automatically center it.

[0033] The self-locking centering paper clamping mechanism 5 includes a first clamping plate 51 and a second clamping plate 52 symmetrically arranged along the Y-axis. The first clamping plate 51 is linked to a first self-locking centering component 53 that drives it to move closer to or away from the second clamping plate 52 along the Y-axis. The second clamping plate 52 is linked to a second self-locking centering component 54 that drives it to move closer to or away from the first clamping plate 51 along the Y-axis. The second self-locking centering component 54 has the same structure as the first self-locking centering component 53. In addition, the mechanism also includes a first opening and closing control component 55 disposed along the Y-axis at the center of the front side of the frame 1 and a second opening and closing control component 56 disposed along the Y-axis at the center of the rear side of the frame 1.

[0034] The first self-locking centering assembly 53 includes a first fixed plate 531 fixed to the flipping feed table 31, a first front positioning plate 532 distributed on one side of the first fixed plate 531, and a first rear positioning plate 533 distributed on the other side of the first fixed plate 531 and arranged parallel to the first front positioning plate 532. The first front positioning plate 532 and the first rear positioning plate 533 are linked and can move synchronously along the Y-axis. The first front positioning plate 532 is fixedly connected to the lower end of the first clamping plate 51. At least one first linkage rod 534 is fixedly connected to the first rear positioning plate 533, and the end of the first linkage rod 534 away from the first rear positioning plate 533 is fixedly connected to the first front positioning plate 532. The first fixed plate 531 is machined with a first guide hole corresponding to each first linkage rod 534, which is clearance-fitted with the first linkage rod 534. A first spring 536 is sleeved on the outer periphery of the first linkage rod 534. The first spring 536 is located between the first front positioning plate 532 and the first fixed plate 531, with one end abutting against the first front positioning plate 532 and the other end abutting against the first fixed plate 531.

[0035] The first self-locking centering assembly 53 also includes a first swing opening / closing member 537. A first clamping guide groove 538 parallel to the first clamping plate 51 is machined on the first fixed plate 531. One end of the first swing opening / closing member 537 is rotatably connected to a first sliding member 539, which inserts into the first clamping guide groove 538 and can reciprocate along it. A first guide post 5310 is rotatably connected to the middle of the first swing opening / closing member 537. The lower end of the first guide post 5310 is fixed to the first rear positioning plate 533, and its central axis is offset from the centerline of the first clamping guide groove 538. The other end of the first swing opening / closing member 537 extends away from the first clamping plate 51 and is provided with a first mounting shaft. A first roller 5312 is rotatably mounted on the outer circumference of the first mounting shaft.

[0036] The structure of the second self-locking centering assembly 54 is symmetrical to that of the first self-locking centering assembly 53, and includes a second fixed plate, a second front positioning plate, a second rear positioning plate, a second linkage rod, a second guide hole, a second spring, a second swing opening and closing member 541, a second clamping guide groove, a second sliding member, a second guide post, a second mounting shaft, and a second roller 542. The first swing opening and closing member 537 and the second swing opening and closing member 541 are respectively disposed on both sides of the Y-axis.

[0037] The first opening / closing control component 55 includes a first locking plate 551 disposed on the right side of the Y-axis and a first opening plate 552 disposed on the left side of the Y-axis. The first locking plate 551 is located below the first opening plate 552 along the Z-axis. The first locking plate 551 includes a first locking surface 5511 inclined downward along the Z-axis and a first lower limit surface 5512 connected to the lower end of the first locking surface 5511. A first chamfer 5513 is machined on the side facing the flipping feed table 31. The first opening plate 552 includes a first opening surface 5521 inclined upward along the Z-axis, a first upper limit surface 5522 connected to the upper end of the first opening surface 5521, and a third chamfer.

[0038] The second opening / closing control component 56 is symmetrical to and opposite to the first opening / closing control component 55. It includes a second locking plate 561 located on the left side of the Y-axis and a second opening plate 562 located on the right side of the Y-axis. The second locking plate 561 is positioned below the second opening plate 562 along the Z-axis. The second locking plate 561 includes a second locking surface 5611, a second lower limit surface 5612, and a second chamfer 5613. The second opening plate 562 includes a second opening surface 5621, a second upper limit surface 5622, and a fourth chamfer.

[0039] The tilting feeder 31 has several mounting holes 312 machined on it. Each mounting hole 312 is equipped with a rotatable lifting roller 313. The lifting roller 313 is higher than the worktable surface 311 of the tilting feeder 31 to facilitate material sliding.

[0040] The rotating assembly 32 includes a rotating shaft 321 and a first servo motor 322 linked to one end of the rotating shaft 321. A tilting positioning seat 314 is machined at the lower center of the tilting feed table 31, and the tilting positioning seat 314 is fixed to the outer periphery of the rotating shaft 321 through a machined tilting linkage hole. The lifting assembly 33 includes two lifting seats 331 symmetrically arranged at both ends of the rotating shaft 321. The body of the first servo motor 322 is fixed to one of the lifting seats 331. A first lead screw 332 is threaded onto one end of the lifting seat 331, and a second lead screw 333 is threaded onto the other end. The threads of the first lead screw 332 and the second lead screw 333 have the same direction of rotation. A second servo motor 334 is linked to the ends of both the first lead screw 332 and the second lead screw 333, and the body of the second servo motor 334 is fixed to the frame 1. A first cylinder 335 is installed on one side of a lifting seat 331, and its output end is linked to a first lifting plate 336; a second cylinder is installed on one side of another lifting seat 331, and its output end is linked to a second lifting plate. The first lifting plate 336 and the second lifting plate are respectively located on both sides of the X-axis, and their ends are machined with bevels to assist in the horizontal positioning of the flipping feeding table 31 when feeding material upwards, and to prevent the flipping feeding table 31 from tilting.

[0041] The lifting mechanism 4 includes a lifting arm 41 fixed below the lower positioning seat 2 and a triangular swing block 42 arranged parallel to the lifting arm 41. A slider 43 is fixed to the end of the lifting arm 41 away from the lower positioning seat 2. The slider 43 is slidably fitted with a slide rail 44 arranged along the Z-axis, and the slide rail 44 is fixed to the frame 1. A lifting arm guide groove 411 is machined on the lifting arm 41. The lower first end of the triangular swing block 42 is rotatably mounted on the frame 1, and the upper second end is fixed with a pull rod 45. A roller 46 is rotatably connected to the third end between the first and second ends, and the roller 46 is rotatably mounted within the lifting arm guide groove 411. A rotatable linkage sleeve 47 is fitted on the pull rod 45, and the linkage sleeve 47 is linked to a third cylinder 48. The body of the third cylinder 48 is rotatably mounted on the frame 1. Positioning posts 21 are evenly distributed around the upper perimeter of the lower positioning seat 2. Matching positioning holes are machined below each positioning post 21 corresponding to the material tray to ensure accurate positioning.

[0042] Example 2: Feeding method of a flip-type automatic feeding device for a die-cutting machine, specifically including the following steps: S1, as attached Figure 10In the initial state shown, the worktable surface 311 of the flip-feeding table 31 faces upwards and is located at a high position above the frame. First, material pre-stacking is performed: the paper to be die-cut is stacked on the material tray, and the material tray is placed on the lower positioning seat 2, positioned by the positioning pin 21 engaging with the positioning hole. The third cylinder 48 of the lifting mechanism 4 is activated, driving the lifting arm 41 to rise along the slide rail 44 via the pull rod 45, triangular swing block 42, and roller 46, thereby raising the lower positioning seat 2 and the material tray to the preset material picking height.

[0043] S2, Reset of the Tilting Feeder 31: The first servo motor 322 of the rotating assembly 32 drives the rotating shaft 321 to rotate 180°, causing the tilting feeder 31 to rotate around the X-axis, so that its worktable surface 311 faces the lower positioning seat 2. Then, the two second servo motors 334 of the lifting assembly 33 synchronously drive the first lead screw 332 and the second lead screw 333 to rotate, causing the two lifting seats 331 and the entire tilting feeder mechanism 3 to descend along the Z-axis until the worktable surface 311 is close to the top of the paper stack on the tray.

[0044] S3, as attached Figures 11 to 12 Material clamping and centering are shown: The lower positioning seat 2 (driven by the lifting mechanism 4) and the tilting feeding table 31 (driven by the lifting assembly 33) move slowly downwards along the Z-axis a short distance synchronously. During this process, as the tilting feeding table 31 moves downwards, the first locking surface 5511 of the first locking plate 551 of the first opening and closing control component 55 fixed on the frame (guided by the first chamfer 5513) contacts and pushes the second roller 542 of the second self-locking centering assembly 54, thereby pushing the second swing opening and closing member 541 to swing around the second guide post. At the same time, the second locking surface 5611 of the second locking plate 561 of the second opening and closing control component 56 pushes the first roller 5312 of the first self-locking centering assembly 53, thereby pushing the first swing opening and closing member 537 to swing around the first guide post 5310. Because the central axes of the first guide post 5310 and the second guide post are misaligned with the center lines of their respective clamping guide grooves, the swing of the swing opening and closing component is converted into linear movement of the first rear positioning plate 533 and the second rear positioning plate along the Y-axis center through the movement of the sliding component within the guide groove. Through the linkage of the first linkage rod 534 and the second linkage rod, the first front positioning plate 532 and the first clamping plate 51, and the second front positioning plate and the second clamping plate 52 are driven to synchronously converge towards the center, thereby clamping both sides of the paper stack. The first spring 536 and the second spring are compressed, providing a stable clamping force and utilizing their elasticity to automatically center the paper stack using the clamping plates on both sides. The lifting roller 313 helps to fine-tune the position of the paper stack during the clamping process.

[0045] S4, after clamping and centering are completed, material flipping and conveying are performed: the first servo motor 322 of the rotating component 32 drives the rotating shaft 321 to rotate 180° in the opposite direction, causing the flipping feeding table 31 and the paper stack clamped on it to rotate around the X-axis, so that the worktable surface 311 and the paper stack face upward. At the same time, the lifting component 33 drives the flipping feeding table 31 to rise along the Z-axis, and the first lifting plate 336 and the second lifting plate extend until they support both sides of the flipping feeding table 31 to prevent the flipping feeding table 31 from tilting. Meanwhile, the lifting mechanism 4 drives the lower positioning seat 2 to descend to the initial low position in order to place a new full-load pallet.

[0046] S5, as attached Figure 13 As shown, when the flipping feeding table 31 rises to a preset height, material is released: at this time, the first opening surface 5521 of the first opening plate 552 of the first opening control component 55 contacts and pushes the first roller 5312 of the first swing opening component 537 in the opposite direction, and the second opening surface 5621 of the second opening plate 562 of the second opening control component 56 pushes the second roller 542 of the second swing opening component 541 in the opposite direction. This causes the first swing opening component 537 and the second swing opening component 541 to swing in opposite directions. Under the reset action of the first spring 536 and the second spring, the first rear positioning plate 533, the first front positioning plate 532 and the first clamping plate 51, as well as the second rear positioning plate, the second front positioning plate and the second clamping plate 52, open and return to the position as shown in the attached figure. Figure 10 The state shown indicates that the stack of paper has been loosened.

[0047] S6. Finally, the paper is fed in a continuous cycle: the external robotic arm (not shown in the figure) gradually removes the paper from the centered and elevated worktable 311 at a predetermined speed for die-cutting. After the paper stack is removed, the first lifting plate 336 and the second lifting plate retract, and then the feed table 31 is flipped to return to its initial position. The above steps S1-S5 are repeated to achieve continuous and automatic feeding.

Claims

1. A flip-type automatic feeding device for a die-cutting machine, comprising a frame, a lower positioning seat disposed below the frame for supporting a material tray, and a flip-feeding mechanism disposed above the lower positioning seat, wherein the lower positioning seat is linked to a lifting mechanism that drives the lower positioning seat to reciprocate along the Z-axis direction, characterized in that: The flipping feeding mechanism includes a flipping feeding table, a rotating component that drives the flipping feeding table to rotate around the X-axis, and a lifting component that drives the flipping feeding table to reciprocate along the Z-axis. The flipping feeding table is provided with a worktable for carrying paper stacks. The flipping feeding table is linked to a self-locking centering paper clamping mechanism that clamps or releases materials placed on the worktable along the Y-axis.

2. The automatic tilting feeding device for a die-cutting machine according to claim 1, characterized in that: The self-locking centering paper clamping mechanism includes a first clamping plate and a second clamping plate symmetrically arranged along the Y-axis. The first clamping plate is linked to a first self-locking centering component that drives the first clamping plate to move closer to or away from the second clamping plate along the Y-axis. The second clamping plate is linked to a second self-locking centering component that drives the second clamping plate to move closer to or away from the first clamping plate along the Y-axis. The second self-locking centering component has the same structure as the first self-locking centering component. The self-locking centering paper clamping mechanism also includes a first opening and closing control component arranged along the Y-axis at the middle of the front side of the frame and a second opening and closing control component arranged along the Y-axis at the middle of the rear side of the frame. The first self-locking centering assembly includes a first fixed plate fixed to the flipping feeding table, a first front positioning plate distributed on one side of the first fixed plate, and a first rear positioning plate distributed on the other side of the first fixed plate and arranged parallel to the first front positioning plate; the first front positioning plate and the first rear positioning plate are linked and can move back and forth synchronously along the Y-axis. The first self-locking centering assembly further includes a first swing opening and closing member. A first clamping guide groove parallel to the first clamping plate is machined on the first fixed plate. One end of the first swing opening and closing member is rotatably connected to a first sliding member. The first sliding member is inserted into the first clamping guide groove and can reciprocate along the first clamping guide groove. A first guide post is rotatably connected to the middle of the first swing opening and closing member. The lower end of the first guide post is fixed to the first rear positioning plate. The central axis of the first guide post is offset from the center line of the first clamping guide groove. The other end of the first swing opening and closing member extends in a direction away from the first clamping plate.

3. The automatic tilting feeding device for a die-cutting machine according to claim 2, characterized in that: The first front positioning plate is fixedly connected to the lower end of the first clamping plate. The first rear positioning plate is fixedly connected to at least one first linkage rod. The end of the first linkage rod away from the first rear positioning plate is fixedly connected to the first front positioning plate. The first fixed plate is machined with a first guide hole that is clearance-fitted with the first linkage rod for each first linkage rod. A first spring is sleeved on the outer periphery of the first linkage rod. The first spring is located between the first front positioning plate and the first fixed plate, and one end of the first spring abuts against the first front positioning plate and the other end of the first spring abuts against the first fixed plate.

4. The automatic tilting feeding device for a die-cutting machine according to claim 2, characterized in that: The second self-locking centering assembly includes a second fixed plate fixed to the flipping feeding table, a second front positioning plate distributed on one side of the second fixed plate, and a second rear positioning plate distributed on the other side of the second fixed plate and arranged parallel to the second front positioning plate; the second front positioning plate and the second rear positioning plate are linked and can move back and forth synchronously along the Y-axis direction. The second self-locking centering assembly further includes a second swing opening and closing member. A second clamping guide groove parallel to the second clamping plate is machined on the second fixed plate. A second sliding member is rotatably connected to one end of the second swing opening and closing member. The second sliding member is inserted into the second clamping guide groove and can reciprocate along the second clamping guide groove. A second guide post is rotatably connected to the middle of the second swing opening and closing member. The lower end of the second guide post is fixed to the second rear positioning plate. The central axis of the second guide post is offset from the center line of the second clamping guide groove. The other end of the second swing opening and closing member extends in a direction away from the second clamping plate. The first swing opening and closing component and the second swing opening and closing component are respectively disposed on both sides of the Y-axis.

5. The automatic tilting feeding device for a die-cutting machine according to claim 4, characterized in that: The first opening and closing control component includes a first locking plate disposed on the right side of the Y-axis and a first opening plate disposed on the left side of the Y-axis. The first locking plate is located below the first opening plate along the Z-axis. The first locking plate includes a first locking surface disposed downward along the Z-axis and a first lower limit surface connected to the lower end of the first locking surface. The first opening plate includes a first opening surface disposed upward along the Z-axis and a first upper limit surface connected to the upper end of the first opening surface. A first chamfer is machined on the side of the first locking surface facing the flip-feed table below, and a third chamfer is machined on the side of the first opening surface facing the flip-feed table above. The second opening and closing control component includes a second locking plate disposed on the left side of the Y-axis and a second opening plate disposed on the right side of the Y-axis. The second locking plate is located below the second opening plate along the Z-axis. The second locking plate includes a second locking surface that is inclined downward along the Z-axis and a second lower limit surface that is connected to the lower end of the second locking surface. The second opening plate includes a second opening surface that is inclined upward along the Z-axis and a second upper limit surface that is connected to the upper end of the second opening surface. A second chamfer is machined on the side of the second locking surface facing the flip-feeding table below, and a fourth chamfer is machined on the side of the second opening surface facing the flip-feeding table above.

6. The automatic tilting feeding device for a die-cutting machine according to claim 5, characterized in that: The first swing opening and closing member has a first mounting shaft at its end away from the first fixed plate, and a first roller is rotatably mounted on the outer periphery of the first mounting shaft. The second swing opening and closing member has a second mounting shaft at its end away from the second fixed plate, and a second roller is rotatably mounted on the outer periphery of the second mounting shaft. The flipping feeding table is machined with a plurality of mounting holes, and each mounting hole is provided with a rotatable lifting roller. The lifting roller is higher than the worktable surface of the flipping feeding table.

7. The automatic tilting feeding device for a die-cutting machine according to any one of claims 1 to 6, characterized in that: The rotating assembly includes a rotating shaft and a first servo motor linked to one end of the rotating shaft. A flipping positioning seat is machined in the lower center of the flipping feeding table. The flipping positioning seat is fixed to the outer periphery of the rotating shaft through a flipping linkage hole. The lifting assembly includes two lifting seats symmetrically arranged at both ends of the rotating shaft. The body of the first servo motor is fixed on one lifting seat. A first lead screw is threaded to one end of the lifting seat, and a second lead screw is threaded to the other end of the lifting seat. The first lead screw and the second lead screw have the same thread direction. A second servo motor is linked to the end of the first lead screw and the end of the second lead screw, respectively. The body of the second servo motor is fixed on the frame.

8. The automatic tilting feeding device for a die-cutting machine according to claim 7, characterized in that: A first cylinder is installed on one side of one of the lifting seats, and the output end of the first cylinder is linked to a first lifting plate. A second cylinder is installed on one side of the other lifting seat, and the output end of the second cylinder is linked to a second lifting plate. The first lifting plate and the second lifting plate are respectively located on both sides of the X-axis, and the ends of the first lifting plate and the second lifting plate are both machined with bevels.

9. The automatic tilting feeding device for a die-cutting machine according to any one of claims 1 to 6, characterized in that: The lifting mechanism includes a lifting arm fixed below the lower positioning seat and a triangular swing block arranged parallel to the lifting arm. A slider is fixed to the end of the lifting arm away from the lower positioning seat. The slider is slidably fitted with a slide rail, which is arranged along the Z-axis and fixed to the frame. A lifting arm guide groove is machined on the lifting arm. The lower first end of the triangular swing block is rotatably mounted on the frame. A pull rod is fixed to the upper second end of the triangular swing block. A roller is rotatably connected to the third end of the triangular swing block between the first and second ends. The roller is rotatably mounted in the lifting arm guide groove. A rotatable linkage sleeve is fitted on the pull rod. The linkage sleeve is linked to a third cylinder. The body of the third cylinder is rotatably mounted on the frame. Positioning posts are evenly distributed around the upper perimeter of the lower positioning seat. A matching positioning hole is machined below the material tray corresponding to each positioning post.

10. The feeding method of the automatic tilting feeding device for a die-cutting machine according to claim 5, characterized in that: S1, Material pre-stacking: Stack the materials to be die-cut on the upper surface of the material tray, place the material tray on the lower positioning seat, and the lifting mechanism drives the lower positioning seat to rise along the Z-axis to the preset material picking height. S2, the flip feeder is reset, and the rotating component drives the flip feeder to rotate 180° around the X-axis so that the worktable surface faces down; The lifting assembly drives the tilting feeding table to move down along the Z-axis until the worktable surface is close to the material pile on the tray. S3, material clamping and centering, the lower positioning seat and the flipping feeding table move down along the Z axis synchronously, the first locking surface of the first opening and closing control component pushes the second swing opening and closing component, the second locking surface of the second opening and closing control component pushes the first swing opening and closing component, so that the first clamping plate and the second clamping plate retract along the Y axis to the center, clamping the material and automatically centering it; S4, material flipping and conveying: the rotating component drives the flipping feeding table to rotate 180° in the opposite direction around the X-axis, so that the worktable surface faces upward; the lifting component drives the flipping feeding table to rise along the Z-axis, and the lower positioning seat simultaneously descends to the initial position. S5, material release: When the flipping feeding table rises to the preset height, the first opening surface of the first opening and closing control component pushes the first swing opening and closing component, and the second opening surface of the second opening and closing control component pushes the second swing opening and closing component, so that the first clamping plate and the second clamping plate open outward along the Y axis to release the material. S6, cyclic feeding: After the external robotic arm takes away the material, the feeder is flipped and reset to the initial position. Steps S1 to S5 are repeated to achieve continuous feeding.

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