A flexible paper pressing mechanism for a leading edge paper feeder

Abstract

This utility model discloses a flexible paper pressing mechanism for a leading-edge paper feeder. Addressing the problems of traditional mechanisms such as rigid pressing that easily damages paper, poor guide adaptability, and insufficient synchronization, the design includes a conveying component, an adjustable-height guide component, and a paper pressing component with alternating pressing rollers and auxiliary support rollers, in conjunction with a servo motor drive component and an elastic pressing component (ball screw, spring, pressure sensor). Flexible pressing is achieved through elastic pressing, the guide is adjustable to adapt to different thicknesses, and the servo drive ensures synchronization, reducing paper damage and improving paper feeding accuracy and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a flexible paper pressing mechanism for a leading edge paper feeder. Background Technology

[0002] In the cardboard box production process, the leading edge paper feeding is a crucial step that determines the accuracy of subsequent printing, die-cutting, and forming processes. Cardboard boxes are mostly made of corrugated paper, white cardboard, etc., and their thickness varies (usually between 0.5-3mm). The surface is also prone to creases or damage due to compression and friction. Therefore, high requirements are placed on the conveying stability, guiding accuracy, and pressing flexibility of the paper feeding process.

[0003] Traditional paper feeding mechanisms often employ rigid pressure rollers that directly contact the paper, resulting in the following significant drawbacks: 1. Rigid pressure easily damages the paper: The rigid pressure roller applies constant pressure to the paper, making it impossible to dynamically adjust the pressure according to the paper's thickness and flexibility. This easily leads to wrinkles on thin paper and indentations on the surface of thick paper, affecting subsequent printing quality. 2. Poor guide adaptability: The guide components are mostly fixed-height structures, making it difficult to quickly adapt to the guiding requirements of paper of different thicknesses. Manual adjustments are required, reducing production efficiency. 3. Insufficient synchronization: The pressure rollers and conveyor belt drives are not synchronized. Mismatched linear speeds (i.e., the circumferential speed of the conveyor belt / roller) often cause paper pulling (too fast) or piling (too slow), resulting in paper feeding misalignment and increasing scrap rates. 4. Weak pressure stability: Lacking a pressure feedback mechanism, the pressure status cannot be monitored in real time. Affected by paper tension fluctuations, the pressure rollers are prone to jumping or detaching from the paper, affecting the reliability of continuous paper feeding.

[0004] Therefore, there is an urgent need for a leading edge paper feeding mechanism that can adapt to paper of different thicknesses, has flexible pressing function, and has high paper feeding accuracy, in order to meet the high quality and high efficiency requirements of carton production. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a flexible paper pressing mechanism for a leading edge paper feeder.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] This utility model discloses a flexible paper pressing mechanism for a leading edge paper feeder, comprising a conveying component, a guiding component, a paper pressing component, a driving component, and an elastic pressing component. The conveying component is used for the main conveying of paper, and a guiding component is arranged above its input end. The guiding component adjusts its height to adapt to the paper thickness, thereby guiding the paper into the conveying component along the conveying direction. A paper pressing component is arranged parallel to one side of the conveying path of the conveying component. The paper pressing component includes a fixed base, on which several sets of lower pressing rollers and auxiliary support rollers are arranged sequentially and at intervals along the paper conveying direction, and the spacing between adjacent lower pressing rollers and auxiliary support rollers is equal. Above each lower pressing roller is an upper pressing roller that rolls with it. The two ends of the upper pressing roller are vertically and vertically connected to the ends of the lower pressing rollers through the elastic pressing component. The driving component is connected to the lower pressing rollers and drives all lower pressing rollers to rotate synchronously, with its rotational linear velocity matching the conveying speed of the conveying component. The elastic pressing component provides adjustable downward pressure, allowing the upper pressing rollers to flexibly press the paper during conveying.

[0008] As a preferred embodiment of this utility model, the conveying assembly includes a closed-loop conveyor belt, which is tensioned and wrapped between the driving roller and the driven roller; the input end of the driving roller is connected to the tensioning wheel set via a synchronous belt, and the other end is connected to the output shaft of the conveying drive motor; both ends of the driven roller are fixed to the conveyor frame via transmission bearing seats, so as to drive the conveyor belt to circulate through the conveying drive motor.

[0009] As a preferred embodiment of this utility model, the fixed base is provided with an adjustable height support frame along the direction perpendicular to the paper conveying direction, and the auxiliary support roller is rotatably mounted on the support frame via a self-aligning ball bearing; the bottom of the support frame is abutted against the top surface of the fixed base by bolts, so that the height of the support frame can be adjusted by adjusting the position of the bolts, thereby adapting to the bottom support requirements of paper of different thicknesses; the spacing between adjacent lower paper rollers is equal, and the spacing between adjacent lower paper rollers and the auxiliary support roller is equal.

[0010] As a preferred embodiment of this utility model, the driving assembly includes a first fixed bearing seat and a second fixed bearing seat respectively disposed at both ends of the lower pressure roller. The first fixed bearing seat and the second fixed bearing seat are fixed to the fixed base by bolts. A synchronous pulley is fixed at one end of the lower pressure roller, and all synchronous pulleys are connected by a synchronous toothed belt. The input end of the synchronous toothed belt is driven and connected to the output shaft of the servo motor, and the servo motor is fixed to the side of the fixed base by a motor mount, so as to drive all lower pressure rollers to rotate synchronously.

[0011] As a preferred embodiment of this utility model, the elastic pressing assembly includes a T-shaped pressing support disposed on the top of a first fixed bearing seat and a second fixed bearing seat. The groove of the pressing support faces downward and is fixedly connected to the top of the fixed bearing seat by bolts. A through hole is provided on the top of the pressing support, and a ball screw passes through the through hole. The upper end of the ball screw is driven and connected to the output shaft of the pressing drive motor through a coupling. A pressing spring is sleeved on the outer periphery of the ball screw, and its bottom is fixedly connected to the end of the upper pressure roller through a connecting block. The upper end of the pressing spring abuts against the bottom surface of the pressing support. A guide groove is provided on the inner side of the pressing support, and a guide block is provided at the end of the upper pressure roller. The guide block is slidably embedded in the guide groove. A pressure sensor is fixed on the side of the pressing support, and the lower end of the pressure sensor abuts against the top of the guide block.

[0012] As a preferred embodiment of this utility model, the guiding assembly includes fixed supports disposed on both sides of the conveying assembly. A swingable rotating support is hinged to the fixed supports via a horizontal pin, the axis of which is perpendicular to the paper conveying direction. The rotating support has a rhomboid structure, with its longer diagonal arranged horizontally and an adjusting screw screwed to the middle of its shorter diagonal. The adjusting screw passes vertically through the top plate of the fixed supports, its lower end abutting against the middle of the rotating support, and a handwheel is provided at its lower end. Guide rollers are mounted on both ends of the rotating support via bearing seats, and the guide rollers are connected to the tensioning wheel assembly on the side of the fixed supports via a closed-loop belt drive. The swing angle of the rotating support is adjusted by rotating the handwheel, thereby changing the vertical distance between the guide rollers and the conveying assembly.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. Through the cooperation of the elastic pressing component (including pressing spring and pressure sensor) and the upper pressing roller, the pressing force can be dynamically adjusted according to the paper thickness and flexibility: the pressure sensor monitors the holding force in real time and feeds it back to the control system. Combined with the buffering characteristics of the spring, it avoids thin paper wrinkles or thick paper indentations caused by rigid pressing, effectively protects the surface quality of the carton, and improves the yield of subsequent printing and die-cutting processes.

[0015] 2. Thickness Adaptability: The rotating bracket of the guide assembly can adjust the vertical distance between the guide roller and the conveyor belt via an adjusting screw, quickly adapting to the guiding needs of paper of different thicknesses; the auxiliary support roller adapts to the bottom support of the paper through an adjustable height support frame (bolt adjustment), avoiding conveyor deviation caused by uneven paper thickness. Speed ​​Adaptability: The drive assembly adopts a servo motor + synchronous toothed belt transmission method to ensure that all pressure rollers rotate synchronously, and their linear speed is strictly matched with the conveyor belt's conveying speed, avoiding paper pulling or accumulation and ensuring the stability of continuous paper feeding;

[0016] 3. The diamond-shaped rotating bracket of the guide assembly utilizes the lever principle, allowing for precise adjustment of the guide roller angle via a handwheel. This provides convenient operation and a wide adjustment range. The guide roller and tension wheel assembly are driven by a closed-loop belt, ensuring synchronous rotation of the guide roller and preventing guidance errors caused by slippage. The lower pressure roller and auxiliary support roller of the paper pressing assembly are arranged alternately at equal intervals, forming a uniform support and pressing structure that disperses paper pressure, further improving stability during transport.

[0017] 4. The pressure sensor of the elastic pressing component provides real-time feedback of the holding force data. Combined with the precise speed regulation of the servo motor, it realizes closed-loop control of the paper feeding process and reduces manual intervention. The cooperation between the ball screw and the guide groove restricts the upper pressure roller to move only up and down, avoiding jamming or wear caused by deviation and extending the service life of the equipment. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is the front view of this utility model;

[0021] Figure 3 This is a partial enlarged view of the present invention;

[0022] Figure 4 This is a side view of the present invention;

[0023] Figure 5 This is a top view of the present invention;

[0024] In the diagram: 1. Conveying assembly; 2. Guiding assembly; 3. Paper pressing assembly; 4. Drive assembly; 5. Elastic lower pressing assembly; 11. Conveyor belt; 12. Drive roller; 13. Driven roller; 14. Conveyor drive motor; 15. Conveyor frame; 21. Fixed bracket; 22. Rotating bracket; 23. Adjusting screw; 24. Guide roller; 25. Tensioning wheel assembly; 26. Closed-loop belt; 27. Handwheel; 31. Fixed base; 32. Auxiliary support roller; 33. Lower paper pressing roller; 34. Upper paper pressing roller. 35. Roller; 36. Support frame; 47. Self-aligning ball bearing; 48. First fixed bearing housing; 49. Second fixed bearing housing; 40. Synchronous pulley; 41. Synchronous toothed belt; 42. Servo motor; 43. Motor housing; 54. Downward pressure support; 55. Downward pressure drive motor; 56. Coupling; 57. Ball screw; 58. Downward pressure spring; 59. Connecting block; 50. Pressure sensor; 121. Synchronous belt; 131. Transmission bearing housing; 341. Guide block; 511. Guide groove. Detailed Implementation

[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0026] In the attached diagram, all identical reference numerals refer to the same components.

[0027] Example 1: Paper feeding scenario for medium-thickness cardboard boxes (1.5-2.5mm corrugated paper)

[0028] This embodiment applies to the leading edge paper feeding stage in conventional corrugated box production. For example... Figure 1-5 As shown, in the conveying assembly 1, the closed loop conveyor belt 11 is tensioned and wrapped between the drive roller 12 and the driven roller 13. The input end of the drive roller 12 is connected to the tensioning wheel group 25 through the synchronous belt 121, and the other end is driven to rotate by the conveying drive motor 14. The two ends of the driven roller 13 are fixed to the conveyor frame 15 through the transmission bearing seat 131, forming a stable main conveying path.

[0029] The guide assembly 2 is symmetrically arranged on both sides of the conveying assembly 1: the top of the fixed bracket 21 is hinged to the diamond-shaped rotating bracket 22 (the long diagonal is horizontal) by a horizontal pin shaft. The middle of the rotating bracket 22 is screwed with an adjusting screw 23, the lower end of which abuts against the middle of the rotating bracket 22 and is driven to rotate by a handwheel 27. By adjusting the handwheel 27, the swing angle of the rotating bracket 22 can be finely adjusted so that the vertical distance between the guide rollers 24 at both ends and the conveyor belt 11 is adapted to a paper thickness of 1.5-2.5mm. The guide rollers 24 are installed at both ends of the rotating bracket 22 through bearing seats and are driven by the tensioning wheel group 25 on the side of the fixed bracket 21 through a closed-loop belt 26 to ensure that the guide rollers rotate synchronously and avoid paper deviation.

[0030] Please see the appendix Figure 2 , Figure 3 The paper pressing assembly 3 is installed above the conveying assembly 1: a support frame 35 is set on the fixed base 31 along the vertical conveying direction, and its bottom is abutted against the top surface of the fixed base 31 by bolts. The auxiliary support roller 32 is mounted on the support frame 35 by self-aligning ball bearings 36. The support frame 35 is adapted to the bottom support requirements of the paper by adjusting the height of the bolts. The lower paper pressing roller 33 and the auxiliary support roller 32 (adjacent spacing is equal) are arranged sequentially and at intervals along the conveying direction on the fixed base 31 to form a uniform support structure. Above each lower pressure roller 33 is an upper pressure roller 34, the two ends of which are connected to the ends of the lower pressure roller 33 by elastic lower pressure components 5. The first fixed bearing seat 41 and the second fixed bearing seat 42 are respectively located at the two ends of the lower pressure roller 33 (fixed to the fixed base 31 by bolts). One end of the lower pressure roller 33 is fixed with a synchronous pulley 43. The synchronous pulley 43 is linked to the output shaft of the servo motor 45 through the synchronous toothed belt 44 (the servo motor 45 is fixed to the side of the fixed base 31 through the motor seat 46), ensuring that the linear speed of the lower pressure roller 33 is consistent with the speed of the conveyor belt 11. The T-shaped lower pressure support 51 is fixed to the top of the fixed bearing seat with the slot facing downward. The ball screw 54 passes through the through hole at the top of the support. The upper end is driven by a downward pressure drive motor 52 through a coupling 53. A downward pressure spring 55 is sleeved on the outer periphery of the ball screw 54. The bottom is fixed to the end of the upper pressure roller 34 through a connecting block 56. The upper end of the spring abuts against the bottom surface of the downward pressure support 51. A guide groove 511 is opened on the inner side of the downward pressure support 51. A guide block 341 (which slides in the guide groove 511) is provided at the end of the upper pressure roller 34, which restricts its movement to only up and down. A pressure sensor 57 (whose lower end abuts against the top of the guide block 341) is fixed on the side of the downward pressure support 51 to monitor the holding force in real time and feed it back to the control system to adjust the speed of the downward pressure drive motor 52 so that the spring compression is adapted to the flexible holding requirements of 1.5-2.5mm paper.

[0031] Example 2: Precision paper feeding scenario for thin cardboard boxes (0.8-1.2mm white cardboard)

[0032] This embodiment is optimized to address the need for thin whiteboard paper to be easily wrinkled and requires low-pressure holding.

[0033] The adjustment strategy of the guide assembly 2 is more refined: the rotating handwheel 27 rotates the adjusting screw 23 by a small amount, so that the swing angle of the rotating bracket 22 is reduced, and the vertical distance between the guide roller 24 and the conveyor belt 11 is precisely adapted to the paper thickness of 0.8-1.2mm, so as to avoid the guide roller from exerting additional pressure on the paper; the tension of the closed-loop belt 26 is appropriately reduced to reduce the scratches on the surface of the thin paper caused by transmission friction.

[0034] In the paper pressing assembly 3, the support frame 35 is adjusted to its lowest height by bolts, and the auxiliary support roller 32 provides gentler support to the bottom of the thin paper; the pressure spring 55 of the elastic pressing assembly 5 is selected with a lower stiffness, and the stroke of the ball screw 54 is shortened (adjusted within a small range by the pressing drive motor 52). For different paper types, the pressure threshold of the pressure sensor 57 is adjusted to 0.1-0.3N (far lower than 0.5-1.0N in Example 1), ensuring that the pressing force of the upper paper pressing roller 34 on the thin paper is only sufficient to eliminate slight fluctuations during the conveying process and avoid pressing out creases or sticking.

[0035] The servo motor 45 of the drive component 4 adopts a low speed mode, and the preload of the synchronous toothed belt 44 is appropriately reduced to reduce the impact of transmission vibration on the stability of thin paper conveying, ensuring that the linear speed difference between the pressure roller 33 and the conveyor belt 11 is less than 0.1m / min, and avoiding paper pulling or accumulation.

[0036] Example 3: Heavy-duty paper feeding scenario for thick cardboard boxes (2.8-3.5mm double corrugated paper)

[0037] This embodiment is suitable for the high-strength and high-stability paper feeding requirements of thick double-corrugated paper.

[0038] The rotating bracket 22 of the guide assembly 2 rotates the adjusting screw 23 by a large amount of the handwheel 27 to increase the swing angle, thereby increasing the vertical distance between the guide roller 24 and the conveyor belt 11 and avoiding interference between the edge of the thick paper and the guide roller. The closed-loop belt 26 is a high-strength model with increased tension to ensure the synchronization of the guide roller during the conveying of thick paper and prevent guide deviation caused by the large inertia of the thick paper.

[0039] The support frame 35 of the paper pressing assembly 3 is adjusted to its highest height by bolts, and the auxiliary support roller 32 provides more stable support for the bottom of the thick paper, dispersing the pressure of the weight of the thick paper on the conveyor belt 11. The pressure spring 55 of the elastic pressing assembly 5 is selected with a high stiffness, the stroke of the ball screw 54 is increased (adjusted over a wide range by the pressing drive motor 52), and the pressure sensor 57 is set with a pressure threshold of 1.5-2.0N to ensure that the pressing force of the upper paper pressing roller 34 on the thick paper is sufficient to offset the sagging caused by its own weight, and to prevent the paper from separating from the conveyor belt 11 during the conveying process.

[0040] The servo motor 45 of the drive assembly 4 adopts a high torque mode, and the preload of the synchronous toothed belt 44 is increased to ensure the reliability of power transmission when the multiple pressure rollers 33 rotate synchronously. At the same time, the control system dynamically adjusts the speed of the servo motor 45 according to the real-time pressure value fed back by the pressure sensor 57 to compensate for the inertial changes caused by the difference in paper basis weight, and ensures that its synchronization error with the linear speed of the conveyor belt 11 is less than 0.05m / min.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flexible paper pressing mechanism for a leading-edge paper feeder, characterized in that, The assembly includes a conveying component (1), a guiding component (2), a paper pressing component (3), a driving component (4), and an elastic pressing component (5). The conveying component (1) is used for the main conveying of paper. The guiding component (2) is arranged above its input end. The guiding component (2) adjusts its height to match the paper thickness to guide the paper into the conveying component (1) along the conveying direction. The paper pressing component (3) is arranged parallel to one side of the conveying path of the conveying component (1). The paper pressing component (3) includes a fixed base (31). Several sets of pressing rollers (33) and auxiliary supports are arranged sequentially and at intervals along the paper conveying direction on the fixed base (31). The support roller (32) and the spacing between the adjacent lower pressure roller (33) and the auxiliary support roller (32) are equal; each lower pressure roller (33) is provided with an upper pressure roller (34) that rolls with it directly above it. The two ends of the upper pressure roller (34) are connected to the ends of the lower pressure roller (33) in a lifting manner through the elastic lower pressure assembly (5); the drive assembly (4) is driven to connect with the lower pressure roller (33) and drive all the lower pressure rollers (33) to rotate synchronously. Its rotational linear speed matches the conveying speed of the conveying assembly (1); the elastic lower pressure assembly (5) provides adjustable lower pressure so that the upper pressure roller (34) flexibly presses the paper being conveyed.

2. A flexible paper compression mechanism for a leading edge paper feeder as defined in claim 1, characterized in that The conveying assembly (1) includes a closed loop conveyor belt (11) which is tensioned and wrapped between the drive roller (12) and the driven roller (13). The input end of the drive roller (12) is connected to the tensioning wheel group (25) via a synchronous belt (121), and the other end is connected to the output shaft of the conveying drive motor (14). The two ends of the driven roller (13) are fixed to the conveyor frame (15) via transmission bearing seats (131) so that the conveyor belt (11) can be driven to run in a cycle by the conveying drive motor (14).

3. A flexible paper compression mechanism for a leading edge paper feeder as defined in claim 1, wherein The fixed base (31) is provided with an adjustable height support frame (35) along the direction perpendicular to the paper conveying direction. The auxiliary support roller (32) is rotatably mounted on the support frame (35) through a self-aligning ball bearing (36). The bottom of the support frame (35) is abutted against the top surface of the fixed base (31) by bolts, so that the height of the support frame (35) can be adjusted by adjusting the position of the bolts, thereby adapting to the bottom support requirements of different paper thicknesses. The spacing between adjacent lower paper rollers (33) is equal, and the spacing between adjacent lower paper rollers (33) and the auxiliary support roller (32) is equal.

4. A flexible paper compression mechanism for a leading edge paper feeder as defined in claim 1, wherein, The drive assembly (4) includes a first fixed bearing seat (41) and a second fixed bearing seat (42) respectively disposed at both ends of the lower paper roller (33). The first fixed bearing seat (41) and the second fixed bearing seat (42) are fixed to the fixed base (31) by bolts. One end of the lower paper roller (33) is fixed with a synchronous pulley (43), and all synchronous pulleys (43) are connected by a synchronous toothed belt (44). The input end of the synchronous toothed belt (44) is driven and connected to the output shaft of the servo motor (45), and the servo motor (45) is fixed to the side of the fixed base (31) by a motor seat (46) so as to drive all the lower paper rollers (33) to rotate synchronously.

5. A flexible paper compression mechanism for a leading edge paper feeder as defined in claim 4, wherein, The elastic pressing assembly (5) includes a T-shaped pressing support (51) disposed on the top of the first fixed bearing seat (41) and the second fixed bearing seat (42). The slot of the pressing support (51) faces downward and is fixedly connected to the top of the fixed bearing seat by bolts. A through hole is opened on the top of the pressing support (51), and a ball screw (54) is inserted in the through hole. The upper end of the ball screw (54) is driven and connected to the output shaft of the pressing drive motor (52) through a coupling (53). A pressing spring (55) is sleeved on the outer periphery of the ball screw (54). The bottom of the upper pressure roller (34) is fixedly connected to the end of the upper pressure roller (34) by a connecting block (56); the upper end of the lower pressure spring (55) abuts against the bottom surface of the lower pressure support (51); a guide groove (511) is provided on the inner side of the lower pressure support (51), and a guide block (341) is provided at the end of the upper pressure roller (34), and the guide block (341) is slidably embedded in the guide groove (511); a pressure sensor (57) is fixed on the side of the lower pressure support (51), and the lower end of the pressure sensor (57) abuts against the top of the guide block (341).

6. A flexible paper compression mechanism for a leading edge paper feeder as defined in claim 1, wherein, The guide assembly (2) includes fixed brackets (21) disposed on both sides of the conveying assembly (1). A swingable rotating bracket (22) is hinged to the fixed bracket (21) by a horizontal pin. The axis of the horizontal pin is perpendicular to the paper conveying direction. The rotating bracket (22) has a rhomboid structure. Its longer diagonal is set in the horizontal direction, and an adjusting screw (23) is screwed to the middle of the shorter diagonal. The adjusting screw (23) passes vertically through the top plate of the fixed bracket (21). Its lower end abuts against the middle of the rotating bracket (22), and a handwheel (27) is provided at the lower end. Guide rollers (24) are installed at both ends of the rotating bracket (22) through bearing seats. The guide rollers (24) are connected to the tensioning wheel group (25) on the side of the fixed bracket (21) through a closed-loop belt (26). The swing angle of the rotating bracket (22) is adjusted by rotating the handwheel (27), thereby changing the vertical distance between the guide roller (24) and the conveying assembly (1).

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