A sanitary napkin packaging machine film tensioning mechanism

Abstract

This utility model discloses a film tensioning mechanism for a sanitary napkin packaging machine, including a supporting beam, a fixed plate, a bushing, a rotating shaft, a swing arm, a first free roller, a second free roller, a third free roller, a spring, an adjusting block, and a supporting plate. The two ends of the beam are fixed to the main frame, providing support for the entire mechanism. The fixed plate is fixed to the beam and used to install other components. The bushing is mounted on the fixed plate, serving to position and support the rotating shaft, thus solving the problems of film loosening, bottom sealing position deviation, and low finished product qualification rate in existing sanitary napkin packaging machines due to the lack of a film tensioning mechanism.

Description

Technical Field

[0001] This utility model relates to the field of sanitary napkin packaging machines, specifically to a film tensioning mechanism for a sanitary napkin packaging machine. Background Technology

[0002] Currently, existing sanitary napkin packaging machines mainly rely on a front-end bag-making servo motor for film feeding, and each bag needs to be sealed online. Because there is no film tensioning mechanism between the bag-making section and the unwinding section, the film at the rear end is in a slack state during operation, leading to deviations in the sealing position. This severely affects the machine's operational stability and reduces the finished product qualification rate. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a film tensioning mechanism for a sanitary napkin packaging machine, thereby solving the problems of film slack, bottom sealing position deviation, and low finished product qualification rate caused by the lack of a film tensioning mechanism in existing sanitary napkin packaging machines.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A film tensioning mechanism for a sanitary napkin packaging machine includes a supporting beam, a fixed plate, bushings, a rotating shaft, a swing arm, a first free roller, a second free roller, a third free roller, a spring, an adjusting block, and a support plate. The beam is fixed at both ends to the main frame, providing support for the entire mechanism. The fixed plate is fixed to the beam and used to mount other components. The bushings are mounted on the fixed plate, serving to position and support the rotating shaft.

[0006] Further optimized, the rotating shaft is mounted on a bushing via two bearings, allowing for flexible rotation. A swing arm is mounted at one end of the bushing, rotating around the rotating shaft. A first free roller mounted at one end of the swing arm rotates with the swing arm, contacting the membrane and applying tension to it by changing its position. A spring is mounted below the swing arm, with its other end fixed to an adjusting block mounted on a crossbeam. The spring extends and retracts according to the membrane's tension; the initial tension of the spring can be adjusted by changing the position of the adjusting block on the crossbeam.

[0007] Furthermore, a support plate is installed at the top of the fixed plate, and a third free roller is installed at one end of the support plate. The second free roller is installed on the fixed plate. The second and third free rollers assist in guiding the direction of the film, ensuring that the film runs smoothly and steadily during operation.

[0008] This utility model has the following beneficial effects:

[0009] The film tensioning mechanism of this sanitary napkin packaging machine has significant advantages: when the spring extends or retracts, the swing arm rotates around its axis under the action of the spring, driving the first free roller on the swing arm, so that the film remains taut under the high-speed pull of the servo motor. The spring automatically extends or retracts according to the degree of film slack, driving the swing arm and the first free roller to adjust their positions, applying appropriate tension to the film, and effectively ensuring the accuracy of the bottom sealing position of the roll film. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the film tensioning mechanism of a sanitary napkin packaging machine according to this utility model. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and relevant knowledge. Obviously, the described applications are only some embodiments of the present invention, and not all embodiments.

[0012] The present invention will be further described in detail below with reference to the accompanying drawings.

[0013] Reference Figure 1 As shown, a film tensioning mechanism for a sanitary napkin packaging machine includes a supporting beam 1, a fixed plate 2, a bushing 3, a rotating shaft 10, a swing arm 11, a first free roller 4, a second free roller 8, a third free roller 9, a spring 6, an adjusting block 5, and a support plate 7. The two ends of the beam 1 are fixed to the main frame, the fixed plate 2 is fixed to the beam 1, the bushing 3 is mounted on the fixed plate 2, the rotating shaft 10 is mounted on the bushing 3 through two bearings, the swing arm 11 is mounted on one end of the bushing 3, the first free roller 4 is mounted on one end of the swing arm 11, the spring 6 is mounted below the swing arm 11, the other end of the spring 6 is fixed to the adjusting block 5, the adjusting block 5 is mounted on the beam 1, the support plate 7 is mounted on the top of the fixed plate 2, the third free roller 9 is mounted on one end of the support plate 7, and the second free roller 8 is mounted on the fixed plate 2.

[0014] Working principle: When the sanitary napkin packaging machine starts running, the film 12 begins to move under the pull of the front-end bag-making servo motor. During the movement of the film, if the film becomes slack, the spring 6 will sense the change in film tension. The spring 6 will extend and retract according to the degree of film slack. When the film is slack, the spring 6 extends, and through its own elastic force, it drives the swing arm 11 to rotate around the rotating shaft 10. The rotation of the swing arm 11 causes the position of the first free roller 4 mounted on it to change. The first free roller 4 contacts the film and applies tension to the film, thereby making the film taut again.

[0015] This invention allows for adjustment of the initial tension of the spring 6 by adjusting the position of the adjusting block 5 on the crossbeam 1, based on the specific specifications of the film 12 and the operating conditions of the packaging machine. For example, for thicker or harder films, the adjusting block 5 can be adjusted to a position that results in a larger initial tension of the spring 6; for thinner or softer films, the initial tension of the spring 6 can be appropriately reduced.

[0016] During the film's movement, the second free roller 8 and the third free roller 9 play an auxiliary guiding role. The second free roller 8 is installed on the fixed plate 2 to initially guide the film, allowing it to smoothly enter the tensioning mechanism area. The third free roller 9 is installed at one end of the support plate 7 to further guide the film along a predetermined path. Working in conjunction with the first free roller 4, it ensures that the film remains taut and stable throughout the entire packaging machine operation, thereby guaranteeing accurate sealing of the roll film and improving the operational stability and finished product qualification rate of the sanitary napkin packaging machine.

[0017] Although some embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, and all such changes and alterations should fall within the scope of the present invention.

Claims

1. A sanitary napkin packaging machine film tensioning mechanism characterized by: The system includes a support beam (1), a fixed plate (2), a bushing (3), a rotating shaft (10), a swing arm (11), a first free roller (4), a second free roller (8), a third free roller (9), a spring (6), an adjusting block (5), and a support plate (7). The fixed plate (2) is fixed on the beam (1). The fixed plate (2) is provided with the support plate (7), the second free roller (8), and the bushing (3). The rotating shaft (10) is installed on the bushing (3). The swing arm (11) is installed at one end of the bushing (3). The first free roller (4) is installed at one end of the swing arm (11). The spring (6) is provided below the swing arm (11). The other end of the spring (6) is fixed on the adjusting block (5). The adjusting block (5) is installed on the beam (1). The third free roller (9) is provided at one end of the support plate (7).

2. The sanitary napkin packaging machine film tensioning mechanism of claim 1, wherein: The swing arm (11) is mounted on one end of the bushing (3) and can rotate around the rotation axis (10).

3. The sanitary napkin packaging machine film tensioning mechanism of claim 1, wherein: The adjusting block (5) can move on the crossbeam (1) to adjust the initial tension of the spring (6).

4. The sanitary napkin packaging machine film tensioning mechanism of claim 1, wherein: The second free roller (8) and the third free roller (9) are used to assist in guiding the direction of the membrane (12).

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