Adjustable bottom opening mechanism of bag making machine

Abstract

The utility model discloses an adjustable bottom opening mechanism of a bag making machine, which is characterized in that a driving shaft penetrates through a mounting seat, a cam part is arranged in the mounting seat, the cam part is connected with a movable frame through a connecting shaft, an arc-shaped groove for the connecting shaft to penetrate through is arranged on the mounting seat, a locking component is arranged corresponding to the movable frame, and a bottom opening plate is arranged on the movable frame. A mounting groove is formed in the driving shaft, a pre-cutting tool apron is movably arranged in the mounting groove, a pre-cutting tool is arranged on the pre-cutting tool apron, the pre-cutting tool apron is connected with a transmission block, an elastic piece tightly pressing one end of the transmission block is arranged in the driving shaft, a swing block is further hinged to the driving shaft, the elastic piece is tightly pressed at one end of the swing block, and the other end of the swing block abuts against the transmission block. The pre-cutting device is simple in structure and reasonable in design, the position of the opening bottom plate can be adjusted according to the specification of a packaging bag, meanwhile, the stretching and retracting time of the pre-cutting knife is adaptively adjusted in the position adjusting process of the opening bottom plate, adjusting operation is easy and convenient, adjusting accuracy is good, and the use experience of a user is effectively improved.

Description

Technical Field

[0001] The utility model relates to packaging bag-making equipment, in particular to an adjustable bottom-opening mechanism of a bag-making machine. Background Art

[0002] A bag-making machine is a special equipment for automatic production of packaging bags. During the production process of packaging bags, a bottom-opening operation needs to be carried out on the bag bottom of the packaging bag through a bottom-opening mechanism, and pre-cutting is carried out on the front and rear connected packaging bags through a pre-cutting knife group. When the specifications of the packaging bags change, it is necessary to adjust the position of the bottom-opening plate and the action position of the pre-cutting knife group. In traditional bag-making machines, the position adjustment mechanism of the bottom-opening plate and the action adjustment mechanism of the pre-cutting knife are separately and independently arranged. That is, every time the bag body specifications change, it is necessary to adjust the bottom-opening plate and the pre-cutting knife respectively. The adjustment operation is troublesome and it is difficult to ensure that the two can be accurately matched after adjustment, resulting in a poor user experience. Content of the Utility Model

[0003] In view of the deficiencies of the background art, the technical problem to be solved by the utility model is to provide an adjustable bottom-opening mechanism of a bag-making machine for solving the above problems.

[0004] To this end, the utility model is implemented as follows:

[0005] The adjustable bottom-opening mechanism of a bag-making machine includes a driving shaft, and is characterized in that: the driving shaft passes through a mounting seat, a cam part is arranged in the mounting seat, the cam part is connected with a movable frame through a connecting shaft, an arc-shaped groove for the connecting shaft to pass through is arranged on the mounting seat, a locking assembly is arranged corresponding to the movable frame, a bottom-opening plate is mounted on the movable frame, a mounting groove is arranged on the driving shaft, a pre-cutting knife seat is movably arranged in the mounting groove, a pre-cutting knife is arranged on the pre-cutting knife seat, the pre-cutting knife seat is connected with a transmission block, a first elastic member pressing one end of the transmission block is arranged in the driving shaft, a swing block is also hinged in the driving shaft, a second elastic member is pressed at one end of the swing block, and the other end of the swing block abuts against the transmission block. As the driving shaft rotates, the cam part can contact and squeeze the swing block to swing.

[0006] The first elastic member and the second elastic member are springs.

[0007] The locking assembly includes a locking block, a threaded section is arranged on the connecting shaft, the locking block is screwed with the threaded section, and the movable frame is pressed between the locking block and the mounting seat.

[0008] A strip-shaped groove is arranged on the bottom-opening plate, and a fastener passes through the strip-shaped groove and is screwed with a threaded hole on the movable frame.

[0009] A limiting hole is formed in the transmission block, and a limiting screw is screwed on the driving shaft. The limiting screw passes through the limiting hole, and the aperture of the limiting hole is larger than the diameter of the limiting screw.

[0010] The adjustable bottom-opening mechanism of the bag-making machine with the above technical solution has a simple structure and reasonable design. By adjusting the position of the movable frame, the position of the bottom-opening plate can be adjusted. The cam part is connected to the movable frame. When the movable frame moves, the cam part will move along with it. A swing block and a transmission block structure are provided to cooperate with the cam part to realize the movement of the pre-cutting tool holder. That is, after the position of the bottom-opening plate is adjusted, the synchronous adjustment of the movement position of the pre-cutting tool can be realized at the same time. The adjustment operation is simple, and it is ensured that the bottom-opening plate and the pre-cutting tool can be accurately matched for bottom-opening and pre-cutting operations after adjustment, effectively improving the user experience. Brief Description of the Drawings

[0011] The present utility model has the following drawings:

[0012] Figure 1 It is a schematic structural diagram of the present utility model.

[0013] Figure 2 is Figure 1 a view from another perspective after removing the driving shaft;

[0014] Figure 3 is Figure 2 a partial enlarged view of the position pointed by A in Detailed Embodiment

[0015] As shown in the figure, the adjustable bottom-opening mechanism of the bag-making machine disclosed by the present utility model includes a driving shaft 15. The driving shaft 15 passes through a mounting seat 5. A cam portion 11 is arranged inside the mounting seat 5. The cam portion 11 is connected to a movable frame 3 through a connecting shaft 2. An arc-shaped groove 4 for the connecting shaft 2 to pass through is arranged on the mounting seat 5. A locking assembly is arranged corresponding to the movable frame 3. Specifically, the locking assembly includes a locking block 1. A threaded section is arranged on the connecting shaft 2. The locking block 1 is screwed with the threaded section. The movable frame 3 is tightly pressed between the locking block 1 and the mounting seat 5. By rotating the locking block 1, the locking and loosening of the movable frame 3 can be realized. After the movable frame 3 is loosened, the movable frame 3 and the cam portion 11 can be driven along the arc-shaped groove 4 to adjust the position. An opening bottom plate 12 is installed on the movable frame 3. Further, a strip-shaped groove 13 is arranged on the opening bottom plate 12. A fastener passes through the strip-shaped groove 13 and is screwed with a threaded hole 14 on the movable frame 3, and the front and rear positions of the opening bottom plate 12 can be changed along the strip-shaped groove 13. An installation groove 6 is arranged on the driving shaft 15. A pre-cutting knife seat 7 is movably arranged inside the installation groove 6. A pre-cutting knife 8 is arranged on the pre-cutting knife seat 7. The pre-cutting knife seat 7 is connected to a transmission block 9. A first elastic member 19 pressing one end of the transmission block 9 is arranged inside the driving shaft 15. A swing block 17 is also hinged inside the driving shaft 15. Specifically, a support shaft 18 is arranged on the swing block 17. The swing block 17 can swing along the support shaft 18. One end of the swing block 17 is tightly pressed with a second elastic member 22. In this embodiment, both the first elastic member 19 and the second elastic member 22 are springs. The other end of the swing block 17 abuts against the transmission block. Specifically, a first pressing portion 10 abutting against the transmission block 9 is arranged on the swing block 17. As the driving shaft 15 rotates, the cam portion 11 can contact and press the swing block 17 to swing. A second pressing portion 16 in contact and cooperation with the cam portion 11 is arranged on the swing block 17. Further, a limiting hole 21 is opened on the transmission block 9. A limiting screw 20 is screwed on the driving shaft 15. The limiting screw 20 passes through the limiting hole 21. The aperture of the limiting hole 21 is larger than the diameter of the limiting screw 20. The limiting hole 21 can cooperate with the limiting screw 20 to limit the moving stroke of the transmission block 9, ensuring that the pre-cutting knife seat will not protrude excessively.

[0016] The working principle of the present utility model is as follows: When the packaging bag is sent to the bottom-opening mechanism, it will contact the bottom-opening plate 12 and be bottom-opened under the action of the bottom-opening plate 12. At the same time, the driving shaft 15 rotates to drive the pre-cutting tool holder 7 to rotate to the pre-cutting position. At this time, the second pressing portion 16 on the swing block 17 contacts the cam portion 11 and drives the swing block 17 to swing and press the second elastic member 22. After the swing block 17 swings, the first pressing portion 10 swings away from the transmission block 9. At this time, the first elastic member 19 will press the transmission block 9 to move and drive the pre-cutting tool holder 7 to extend, so that the pre-cutting knife 8 can perform pre-cutting operations on the packaging bag. Then, as the driving shaft 15 continues to rotate, the second pressing portion 16 on the swing block 17 separates from the cam portion 11, and the second elastic member 22 drives the swing block 17 to swing in the reverse direction. The first pressing portion 10 will press the transmission block 9 to move and press the first elastic member 19, and the transmission block 9 drives the pre-cutting tool holder 7 to retract. When the specifications of the packaging bag change, the locking assembly can be loosened, and the movable frame 3 together with the cam portion 11 is adjusted along the arc-shaped groove 4, so that the position of the bottom-opening plate 12 can be adjusted. After the position of the cam portion 11 is adjusted, the extending position of the pre-cutting tool holder 7 is also adjusted simultaneously.

[0017] With this structure of the present utility model, after the position of the bottom-opening plate is adjusted, the synchronous adjustment of the action position of the pre-cutting knife can be realized simultaneously. The adjustment operation is simple, and it is ensured that the bottom-opening plate and the pre-cutting knife can be accurately matched to perform bottom-opening and pre-cutting operations after adjustment, effectively improving the user experience.

Claims

1. An adjustable bottom-opening mechanism for a bag-making machine, comprising a drive shaft (15), characterized in that: The drive shaft (15) passes through the mounting base (5). A cam portion (11) is provided inside the mounting base (5). The cam portion (11) is connected to the movable frame (3) through a connecting shaft (2). An arc-shaped groove (4) for the connecting shaft (2) to pass through is provided on the mounting base (5). A locking assembly is provided corresponding to the movable frame (3). An opening bottom plate (12) is mounted on the movable frame (3). An installation groove (6) is provided on the drive shaft (15). A pre-cutting tool holder (7) is movably arranged in the installation groove (6). A pre-cutting tool (8) is provided on the pre-cutting tool holder (7). The pre-cutting tool holder (7) is connected to a transmission block (9). A first elastic member (19) that presses one end of the transmission block (9) is provided inside the drive shaft (15). A swing block (17) is also hinged inside the drive shaft (15). A second elastic member (22) is pressed at one end of the swing block (17). The other end of the swing block (17) abuts against the transmission block. As the drive shaft (15) rotates, the cam portion (11) can contact and squeeze the swing block (17) to swing.

2. The adjustable bottom-opening mechanism of the bag-making machine according to claim 1, wherein The first elastic member (19) and the second elastic member (22) are springs.

3. The adjustable bottom-opening mechanism of the bag-making machine according to claim 1, wherein The locking assembly includes a locking block (1). A threaded section is provided on the connecting shaft (2). The locking block (1) is screwed to the threaded section. The movable frame (3) is pressed between the locking block (1) and the mounting base (5).

4. The adjustable bottom-opening mechanism of the bag-making machine according to claim 1, characterized in that A strip-shaped groove (13) is provided on the opening bottom plate (12). A fastener passes through the strip-shaped groove (13) and is screwed to a threaded hole (14) on the movable frame (3).

5. The adjustable bottom-opening mechanism of the bag-making machine according to claim 1, characterized in that A limiting hole (21) is formed on the transmission block (9). A limiting screw (20) is screwed on the drive shaft (15). The limiting screw (20) passes through the limiting hole (21). The diameter of the limiting hole (21) is larger than the diameter of the limiting screw (20).

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