A web feed mechanism

Abstract

The utility model discloses a kind of roll material feeding mechanism, including frame, unwinding assembly and driving device;Frame is fixedly provided with mounting baseplate, at least one guide rod is horizontally provided on mounting baseplate, a sliding seat is slidably connected with guide rod;Roller is rotatably arranged on sliding seat, roller is oppositely arranged with unwinding assembly, for tightly pressing roll material on the surface of unwinding assembly;Elastic pressure mechanism is arranged between sliding seat and frame, and elastic pressure mechanism provides elastic pressing force for sliding seat.The utility model provides continuous pressing force for sliding seat and roller by elastic pressure mechanism, the roller is as a movable damping point, can be continuously changed from full roll to empty roll according to unwinding diameter, automatically adjust its position and maintain a relatively constant pressing force.This effectively solves the problem of unstable damping force caused by the change of roll diameter in traditional rigid pressing mode, fundamentally avoids the film tensile deformation or rupture caused by excessive pressure in the initial unwinding stage.

Description

Technical Field

[0001] This utility model particularly relates to a coil feeding mechanism. Background Technology

[0002] In bag making and packaging production lines for plastic bags (such as PE vest bags, tote bags, and garment packaging bags), the performance of the roll unwinding mechanism is the first critical factor determining production efficiency and finished product quality. Currently, common unwinding mechanisms typically consist of a frame, unwinding rollers, and a braking device. To control unwinding tension, many machines use fixed guide plates or pressure rollers to press the film onto the unwinding rollers, utilizing friction to generate damping. However, this rigid pressing method has significant drawbacks: First, it cannot adapt to the drastic change in unwinding diameter from full roll to empty roll, resulting in highly unstable damping force—excessive initial pressure will overstretch the film, causing deformation or breakage, while insufficient pressure in the later stages will lead to loss of tension control, causing the film to loosen and vibrate, resulting in inaccurate feeding at subsequent stations and generating a large amount of waste. Second, during high-speed start-up and shutdown or sudden speed changes, rigid contact easily leaves irreversible scratches or indentations on the glossy roll surface, becoming product defects. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a coil feeding mechanism.

[0004] A roll material feeding mechanism includes a frame, on which an unwinding assembly for unwinding a roll of material and a driving device for driving the unwinding assembly to rotate are rotatably mounted; a mounting base is fixedly mounted on the frame, and at least one guide rod is horizontally mounted on the mounting base, with a sliding seat slidably engaged with the guide rod; a pressure roller is rotatably mounted on the sliding seat, and the pressure roller is arranged opposite to the unwinding assembly to press the roll of material against the surface of the unwinding assembly; an elastic pressing mechanism is provided between the sliding seat and the frame, and the elastic pressing mechanism provides elastic clamping force to the sliding seat.

[0005] Preferably, the sliding seat is provided with a bushing that movably engages with the guide rod.

[0006] Preferably, the mounting base plate includes a horizontal base plate, bent portions extending upward from both sides of the base plate, and a buffer platform located between and spaced apart from the two bent portions; both ends of the guide rod are respectively fixed to the buffer platform, so that the sliding seat contacts the buffer platform at the end of its stroke to achieve a buffering effect.

[0007] Preferably, the unwinding assembly includes a fixed shaft, a take-up reel, and an anti-derailment component; the fixed shaft is connected to the output end of the drive device, the take-up reel passes through the fixed shaft, and the anti-derailment component is disposed at the end of the fixed shaft to prevent axial displacement of the take-up reel.

[0008] Preferably, the anti-detachment component includes an anti-detachment platform sleeved on the fixed shaft, and a fastener is provided on the anti-detachment platform; multiple sets of locking holes are opened along the axial direction on the circumferential sidewall of the fixed shaft as locking positions; one end of the fastener passes through the anti-detachment platform and is threaded into any of the locking holes.

[0009] Preferably, the base plate is fixed to the frame with screws.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This invention provides continuous clamping force to the sliding seat and pressure roller through the elastic pressing mechanism. The pressure roller, acting as a movable damping point, automatically adjusts its position and maintains a relatively constant clamping force according to the continuous change in unwinding diameter from full roll to empty roll. This effectively solves the problem of unstable damping force caused by changes in roll diameter in traditional rigid clamping methods. It fundamentally avoids film stretching deformation or breakage caused by excessive pressure in the early stages of unwinding, as well as film relaxation and vibration caused by insufficient pressure in the later stages of unwinding, thereby ensuring stable tension of the roll material delivered to subsequent workstations. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a roll material feeding mechanism according to this application. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a roll material feeding mechanism according to this application. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a roll material feeding mechanism according to this application. Figure 3 ; Figure 4 This is a schematic diagram of the structure of a roll material feeding mechanism according to this application. Figure 4 ; Figure 5 This is a schematic diagram of the structure of a roll material feeding mechanism according to this application. Figure 5 . Detailed Implementation

[0013] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0014] The orientation shown in the accompanying drawings should not be construed as limiting the specific protection scope of this utility model, but is only for reference and understanding of preferred embodiments. The product components shown in the drawings can be changed in position, increased in number, or simplified in structure.

[0015] The “connection” described in the specification and the “connection” relationship between the components shown in the accompanying drawings can be understood as a fixed connection, a detachable connection, or a connection that forms an integral unit; it can be a direct connection or a connection through an intermediate medium. Those skilled in the art can understand the connection relationship according to the specific circumstances and can derive different implementation methods such as screwing, riveting, welding, snap-fitting, or embedding to suitably replace the connection.

[0016] The directional terms such as up, down, left, right, top, and bottom mentioned in the instruction manual and the directions shown in the attached drawings indicate that the components can directly contact each other or contact each other through other features; for example, "up" can mean directly above or diagonally above, or it simply means above other objects; other directions can be understood by analogy.

[0017] The materials used to manufacture solid-shaped parts as shown in the specification and drawings may be metallic, non-metallic, or other synthetic materials. The machining processes used for solid-shaped parts may include stamping, forging, casting, wire cutting, laser cutting, injection molding, CNC milling, 3D printing, machining, etc. Those skilled in the art may adapt or combine the above materials and manufacturing processes according to different processing conditions, costs, and precision requirements.

[0018] A roll material feeding mechanism includes a frame 1, on which an unwinding assembly for unwinding roll material and a driving device 2 for driving the unwinding assembly to rotate are rotatably mounted; a mounting base 3 is fixedly mounted on the frame 1, and at least one guide rod 4 is horizontally mounted on the mounting base 3, with a sliding seat 5 slidingly engaged with the guide rod 4; a pressure roller 6 is rotatably mounted on the sliding seat 5, and the pressure roller 6 is arranged opposite to the unwinding assembly for pressing the roll material onto the surface of the unwinding assembly; an elastic pressing mechanism 7 is provided between the sliding seat 5 and the frame 1, and the elastic pressing mechanism 7 provides elastic pressing force to the sliding seat 5.

[0019] Furthermore, the sliding seat 5 is provided with a bushing 8 that is movably engaged with the guide rod 4.

[0020] Furthermore, the mounting base plate 3 includes a horizontal base plate 81, bent portions 82 extending upward from both sides of the base plate 81, and buffer platforms 83 located between and spaced apart from the two bent portions 82; the two ends of the guide rod 4 are respectively fixed to the buffer platforms 83, so that the sliding seat 5 contacts the buffer platform 83 at the end of its stroke to achieve a buffering effect.

[0021] Furthermore, the unwinding assembly includes a fixed shaft 91, a take-up reel 92, and an anti-derailment assembly 93; the fixed shaft 91 is connected to the output end of the drive device 2, the take-up reel 92 passes through the fixed shaft 91, and the anti-derailment assembly 93 is disposed at the end of the fixed shaft 91 to prevent the take-up reel 92 from axially displacing.

[0022] Furthermore, the anti-detachment component 93 includes an anti-detachment platform 931 sleeved on the fixed shaft 91, and a fastener 932 is provided on the anti-detachment platform 931; multiple sets of locking holes are opened along the axial direction on the circumferential sidewall of the fixed shaft 91 as locking positions 910; one end of the fastener 932 passes through the anti-detachment platform 931 and is threaded into any of the locking holes.

[0023] Furthermore, the base plate 81 is fixed to the frame 1 with screws.

[0024] This embodiment of a roll feeding mechanism mainly includes a frame 1, an unwinding assembly, a drive device 2, a mounting base 3, a guide rod 4, a sliding seat 5, a pressure roller 6, and an elastic pressing mechanism 7. The unwinding assembly is rotatably mounted on the frame 1 via bearings. In this embodiment, the unwinding assembly is used to unwind the roll material. The drive device 2 is a servo motor, connected to the fixed shaft 91 of the unwinding assembly via a coupling, providing it with rotational power. The mounting base 3 is fixedly mounted on one side of the frame 1 by bolts. The mounting base 3 includes a horizontal base plate 81, with two upwardly bent sections 82 on both sides of the base plate 81, thereby enhancing the overall rigidity. A raised buffer platform 83, spaced apart from the two bent sections 82, is also provided between the two bent sections 82.

[0025] The guide rod 4 passes through the sliding seat 5, and its two ends are fixedly connected to the buffer platform 83. A bushing 8 is installed on the sliding seat 5, forming a sliding fit with the guide rod 4, ensuring that the sliding seat 5 can only move smoothly in the horizontal direction. The pressure roller 6 is rotatably mounted on the sliding seat 5 via bearings, and its axis is parallel to the axis of the unwinding assembly, allowing the outer circumference of the pressure roller 6 to press the rolled material firmly against the surface of the take-up reel 92 of the unwinding assembly.

[0026] The elastic pressing mechanism 7 is a preferred embodiment of this invention, and it is a spring. One end of the spring is connected to the frame 1, and the other end is connected to the sliding seat 5, thereby providing elastic pressing force to the sliding seat 5 and the pressure roller 6.

[0027] Example 2: Specific implementation of anti-detachment component 93 like Figure 1-3 As shown, as a further optimization of the above embodiment, the unwinding assembly includes a fixed shaft 91, a take-up reel 92, and an anti-derailment assembly 93. The take-up reel 92 is fixed to the fixed shaft 91. The anti-derailment assembly 93 is disposed at the end of the fixed shaft 91 away from the drive device 2. The anti-derailment assembly 93 includes an anti-derailment platform 931 sleeved on the fixed shaft 91. The anti-derailment platform 931 is an annular block. A fastener 932 is threadedly connected to the anti-derailment platform 931 in the radial direction. In this embodiment, the fastener 932 is a screw. Multiple threaded holes are machined at intervals along the axial direction on the circumferential sidewall of the fixed shaft 91 as locking holes.

[0028] When it is necessary to install or adjust the take-up reel 92, fix the take-up reel 92 onto the fixed shaft 91, then put on the anti-derailment plate 931 and move it to a position where it just abuts against the take-up reel 92. Then, select the aligned locking hole and use an Allen wrench to tighten the fastener 932 until its end screws into the locking hole. This will securely lock the anti-derailment plate 931 onto the fixed shaft 91, effectively preventing axial displacement of the take-up reel 92 during operation. By selecting different locking holes, it is possible to accommodate take-up reels 92 or rolls of material of different widths, making adjustment very convenient.

[0029] Working scenario: The drive unit 2 starts, driving the unwinding assembly to rotate and begin unwinding the coil. The coil is drawn out from the unwinding assembly and passes through the pressing area between the pressure roller 6 and the unwinding assembly. At the same time, the elastic pressing mechanism 7 applies an elastic pressing force to the sliding seat 5. This force is transmitted to the pressure roller 6 through the sliding seat 5, causing the pressure roller 6 to tightly press the coil against the surface of the unwinding assembly.

[0030] This invention provides continuous clamping force to the sliding seat 5 and the pressure roller 6 through the elastic pressing mechanism 7. The pressure roller 6, acting as a movable damping point, automatically adjusts its position and maintains a relatively constant clamping force according to the continuous change in unwinding diameter from full roll to empty roll. This effectively solves the problem of unstable damping force caused by changes in roll diameter in traditional rigid clamping methods. It fundamentally avoids film stretching deformation or breakage caused by excessive pressure in the early stages of unwinding, as well as film relaxation and vibration caused by insufficient pressure in the later stages of unwinding, thereby ensuring stable tension of the roll material delivered to subsequent workstations.

[0031] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A coil feeding mechanism, characterized in that, The device includes a frame (1), on which an unwinding assembly for unwinding a roll of material is rotatably mounted and a drive device (2) for driving the unwinding assembly to rotate; a mounting base plate (3) is fixedly mounted on the frame (1), and at least one guide rod (4) is horizontally mounted on the mounting base plate (3), and a sliding seat (5) is slidably engaged with the guide rod (4); a pressure roller (6) is rotatably mounted on the sliding seat (5), and the pressure roller (6) is arranged opposite to the unwinding assembly for pressing the roll of material onto the surface of the unwinding assembly; an elastic pressing mechanism (7) is provided between the sliding seat (5) and the frame (1), and the elastic pressing mechanism (7) provides elastic pressing force to the sliding seat (5).

2. The coil feeding mechanism according to claim 1, characterized in that, The sliding seat (5) is provided with a bushing (8) that is movably engaged with the guide rod (4).

3. The coil feeding mechanism according to claim 1, characterized in that, The mounting base plate (3) includes a horizontal base plate (81), bent portions (82) extending upward from both sides of the base plate (81), and buffer platforms (83) located between and spaced apart from the two bent portions (82); the two ends of the guide rod (4) are respectively fixed on the buffer platform (83), so that the sliding seat (5) contacts the buffer platform (83) at the end of its stroke to achieve a buffering effect.

4. The coil feeding mechanism according to claim 1, characterized in that, The unwinding assembly includes a fixed shaft (91), a take-up reel (92), and an anti-detachment assembly (93); the fixed shaft (91) is connected to the output end of the drive device (2), the take-up reel (92) is mounted on the fixed shaft (91), and the anti-detachment assembly (93) is located at the end of the fixed shaft (91) to prevent the take-up reel (92) from axial displacement.

5. A coil feeding mechanism according to claim 4, characterized in that, The anti-detachment component (93) includes an anti-detachment platform (931) sleeved on the fixed shaft (91), and a fastener (932) is provided on the anti-detachment platform (931); multiple sets of locking holes are opened along the axial direction on the circumferential sidewall of the fixed shaft (91) as locking positions (910); one end of the fastener (932) passes through the anti-detachment platform (931) and is threaded into any of the locking holes.

6. A coil feeding mechanism according to claim 3, characterized in that, The base plate (81) is fixed to the frame (1) by screws.

Images