An automatic seaming device for bag roll end butt joining and a seaming butt joining method

Abstract

The application discloses an automatic cutting and sewing device for bag roll end butt joint and a cutting and sewing butt joint method, which comprises a front and rear interval arranged feeding mechanism and unwinding mechanism, the feeding mechanism comprises a feeding frame, the feeding frame is provided with an unwinding shaft and a roll outlet conveying assembly, the roll outlet conveying assembly is provided with a roll outlet bag pressing assembly at the discharge end; the unwinding mechanism comprises a feeding bag pressing assembly, an unwinding transmission assembly behind the feeding bag pressing assembly, the unwinding transmission assembly comprises an unwinding static shaft and an unwinding dynamic shaft which are arranged in a staggered manner from top to bottom for conveying the bag roll and a power roll located at the rear, the feeding bag pressing assembly is of a movable structure, which can reciprocate along the conveying direction of the bag roll, and a cutting mechanism and a sewing mechanism are arranged between the roll outlet bag pressing assembly and the feeding bag pressing assembly. The application saves the process, can avoid the problem that the operation is time-consuming due to replacement of a new bag roll, reduces manual participation, and guarantees the stability of the precision in the unwinding and bag making process.

Description

Technical Field

[0001] This invention relates to the field of packaging equipment, specifically to an automatic cutting and sewing device and method for joining the ends of bag rolls. Background Technology

[0002] In existing packaging production lines, individual pre-made bags are generally not used for bag feeding. Instead, a roll of bags that can produce thousands of individual pre-made bags is used. Then, the filling equipment performs an online cutting and sewing process to complete the individual pre-made bags and fill them in real time. This allows for the feeding of thousands of bags at once, saving manual bag loading time and increasing the overall production line capacity.

[0003] For example, patent publication number CN101015966A discloses a method for manufacturing and filling separate infusion soft bags for pharmaceutical use. In the bag-making process, a bag-making machine is used to create roll-shaped bags, the entire structure being a film roll composed of interconnected infusion soft bags arranged in sequence. After cutting, separate infusion soft bags are produced; then, a filling machine is used for filling. The overall process can be summarized as: film roll – unwinding – multi-color printing – horizontal and vertical heat sealing – rewinding – unfolding and bag cutting – filling.

[0004] The above describes a process for simultaneous bag making and filling. The unwinding and bag-making process generates several independent pre-made bags: a single bag roll is divided into several independent pre-made bags, requiring cutting and bottom sewing processes, resulting in "n" independent material bags. These bags are then fed to the filling equipment for filling. However, this process requires manual operation through many parts of the production line after each bag roll is produced, such as the unwinding stationary shaft, the unwinding moving shaft, and the power roll. Each replacement takes considerable time, which limits the production efficiency of the bag making and filling production line to some extent.

[0005] Therefore, the present invention aims to solve the problem of low production efficiency caused by the long time required to pass through various parts during bag roll replacement in existing equipment. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects and deficiencies of the prior art and to provide an automatic cutting and sewing device and method for connecting the ends of bag rolls, thus solving various problems existing in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An automatic cutting and sewing device for butt-joining bag roll ends includes a feeding mechanism and an unwinding mechanism arranged at intervals. The feeding mechanism includes a feeding frame with an unwinding shaft. An unwinding conveyor assembly is mounted on the unwinding discharge direction of the unwinding shaft. An unwinding pressing assembly for pressing the bag roll out is mounted at the discharge end of the unwinding conveyor assembly. The unwinding mechanism includes an infeed pressing assembly for pressing the bag roll out at the infeed end. An unwinding transmission assembly is located behind the infeed pressing assembly. The unwinding transmission assembly includes a stationary unwinding shaft and a moving unwinding shaft arranged sequentially and staggered to convey the bag roll, and a power shaft located at the rear. The infeed pressing assembly is a movable structure that can reciprocate along the bag roll conveying direction. A cutting mechanism and a sewing mechanism are mounted between the unwinding pressing assembly and the infeed pressing assembly. The cutting mechanism and the sewing mechanism are spaced a certain distance apart, which is the moving distance of the infeed pressing assembly.

[0009] The unwinding conveyor assembly includes a deflector roller arranged side by side, with the two ends of the deflector roller respectively installed on both sides of the rear end of the feeding frame, and a channel for the bag roll film to pass through is provided between the upper and lower deflector rollers.

[0010] The discharge bag pressing assembly is located at the discharge end of the unwinding conveyor assembly. The discharge bag pressing assembly includes an upper pressing plate and a lower pressing plate arranged longitudinally. The two ends of the lower pressing plate are fixedly installed on the winding frame. The upper pressing plate is located directly above the lower pressing plate through a rotating lifting assembly structure.

[0011] The rotating lifting assembly includes a rotating shaft, which is located between the lower pressure plate and the unwinding conveyor assembly. Both ends of the rotating shaft are rotatably mounted on the winding feeder. The rotating shaft is connected and fixed to the upper pressure plate via a transmission arm. The rotation of the rotating shaft is driven by a tilting cylinder at both ends.

[0012] The feeding and pressing bag assembly includes a fixed beam arranged laterally at the unwinding and discharge end. A pressing bag bracket that can move laterally is installed below the fixed beam. A lower pressing plate 1 that supports the bag roll film is fixedly installed on the pressing bag bracket. A flip-up upper pressing plate 2 is mounted above the lower pressing plate 1. The flipping of the upper pressing plate 2 is pivoted on the pressing shaft above it. The upper pressing plate 2 and the pressing shaft are connected by a transmission arm 2. The transmission arm 2 is also connected to a flipping cylinder 2 that drives the upper pressing plate 2 to flip. The flipping cylinder 2 is tilted and mounted on the pressing bag bracket.

[0013] Two parallel transverse guide rails are laid above the bag-pressing bracket. A guide block that cooperates with the transverse guide rails is provided on the bottom end face of the fixed beam. The rear end of the bag-pressing bracket is moved by a push cylinder. The cylinder body of the push cylinder is fixedly installed on the bottom end face of the fixed beam. The piston rod extension end is connected to the upper end face of the bag-pressing bracket through a connecting part.

[0014] A laterally movable bag-cutting assembly is installed on one side of the fixed beam. The bag-cutting assembly includes a cutter bracket, and the movement of the cutter bracket is driven by a guide drive assembly provided on the upper end face of the fixed beam. The bottom end of the cutter bracket is provided with a conical guide port facing the bag roll. A blade is fixedly installed at the rear end of the guide port by a pressure plate, and the cutting edge of the blade is located inside the guide port. The guide drive assembly includes a longitudinal guide rail and a lead screw that drives the cutter bracket to move. The upper end of the cutter bracket is equipped with a slide that guides and cooperates with the longitudinal guide rail and a guide sleeve that screws into the lead screw. The movement of the cutter bracket is driven by a motor at the end of the lead screw.

[0015] The sewing mechanism includes a fixed mounting plate, on which a laterally movable sewing assembly is mounted via a slide. The movement of the slide is driven by a guide transmission assembly. The sewing assembly includes a horizontally placed handheld sewing machine. On one side of the handheld sewing machine, a cutting plate perpendicular to the sealing direction for cutting the sealing thread is mounted via a mounting bracket. A cutting blade is fixedly mounted at the front end of the cutting plate.

[0016] The guiding transmission assembly includes two longitudinal guide rails laid on the mounting plate. The longitudinal guide rails are arranged in parallel. A transversely arranged circulating conveyor belt is arranged below the longitudinal guide rails. The bottom end of the slide is fixedly connected to the circulating conveyor belt through a connecting fixing plate. The transmission of the circulating conveyor belt is driven by a motor at one end. The base of the handheld sewing machine is fixed to one side of the slide by a pressure plate. A mounting bracket is fixedly connected to the outside of the pressure plate. A tangent cylinder is fixedly installed on the mounting bracket. A tangent plate is installed on the piston rod extension end of the tangent cylinder.

[0017] An infrared sensor is installed between the unwinding conveyor assembly and the unwinding shaft to sense whether the unwinding is complete. The infrared sensor is connected to the back-end controller via a signal line. The controller controls the start and stop of the first flipping cylinder of the unwinding bag pressing assembly, the second flipping cylinder of the feeding bag pressing assembly, the unwinding transmission assembly, the bag cutting mechanism, and the sewing mechanism.

[0018] The continuous bag feeding method of the automatic cutting device for joining bag roll ends comprises the following steps:

[0019] S1. Preparations

[0020] First, place the bag roll onto the unwinding shaft of the feeding mechanism. Then, pass the head end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence, and then through the feeding pressing assembly and the unwinding transmission assembly to the bag making mechanism in sequence.

[0021] S2. When the work starts, the power shaft of the unwinding transmission assembly drives the unwinding shaft to continuously unwind until the bag roll on the unwinding shaft is completely unwound. After that, the infrared sensor transmits the unwinding completion signal to the back-end controller. After the back-end controller processes the signal, it starts the discharge bag pressing assembly and the material bag pressing assembly to press down the bag roll simultaneously, and the unwinding transmission assembly stops unwinding and conveying.

[0022] S3. Drive the bag cutting mechanism to perform the material cutting operation;

[0023] S4. After cutting the material, rewind the unwinding shaft and pass the first end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence. A length A is left at the end of the bag roll that passes through, and the downward position of this section is directly opposite the position of the sewing mechanism. Then drive the flipping cylinder to work and press the bag roll corresponding to the length A left.

[0024] S5. Start the push cylinder of the feeding bag pressing assembly to drive the feeding bag pressing assembly to move towards the discharging bag pressing assembly. At this time, the bag roll will have a drooping length B. After this drooping length B droops down, it can ensure that the drooping position is directly opposite the sewing mechanism position and fits with position A in step S4.

[0025] S6. Start the sewing mechanism to sew the bottom ends at points A and B in step S5 from left to right, thereby sewing the previous bag roll and the next bag roll together.

[0026] S7. After the sewing is completed, the second flipping cylinder of the feeding bag pressing assembly and the first flipping cylinder of the discharging bag pressing assembly are activated to release the bag roll. Then, the bag is reset to prepare for the next cutting and sewing operation. The power roll of the unwinding transmission assembly is activated to perform the unwinding operation.

[0027] S8. Once the second bag of rolls is finished, repeat steps S2 through S7.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] The present invention has a reasonable structural design, a simple method principle, and is easy to implement. It eliminates the need for manual operation of passing the unwinding moving shaft, unwinding stationary shaft, and power roll of the unwinding mechanism step by step, and also eliminates the need for subsequent debugging processes, thus saving the process and avoiding the time-consuming operation caused by changing to a new bag roll. Moreover, it reduces manual intervention and ensures the stability of accuracy during the unwinding and bag making process. Attached Figure Description

[0030] Figure 1 This is the front view of the present invention.

[0031] Figure 2 This is a partial structural diagram of the present invention.

[0032] Figure 3 for Figure 2 Enlarged view of the local structure at point A in the middle.

[0033] Figure 4 A schematic diagram showing the positions of the feeding and pressing bag assembly, the cutting mechanism, and the sewing mechanism.

[0034] Figure 5 This is a schematic diagram of the stitching mechanism.

[0035] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0036] Figure label:

[0037] 1. Feeding frame; 2. Unwinding shaft; 3. Unwinding conveyor assembly; 4. Unwinding bag pressing assembly; 5. Feeding bag pressing assembly; 6. Unwinding stationary shaft; 7. Unwinding moving shaft; 8. Powered winding shaft; 9. Cutting mechanism; 10. Sewing mechanism; 41. Upper pressure plate one; 42. Lower pressure plate one; 43. Rotary lifting assembly; 431. Rotating shaft one; 432. Transmission arm one; 433. Tilting cylinder one; 51. Fixed beam; 52. Bag pressing bracket; 53. Lower pressure plate one; 54. Upper pressure plate two; 55. Pressing shaft; 56. 57. Transmission arm II; 58. Tilting cylinder II; 59. Transverse guide rail; 50. Push cylinder; 510. Bag cutting assembly; 5101. Cutter bracket; 5102. Feed guide port; 5103. Blade; 5104. Longitudinal guide rail I; 5105. Lead screw; 101. Mounting plate; 102. Slide; 103. Handheld bag sewing machine; 104. Cutting plate; 106. Longitudinal guide rail II; 107. Circulating conveyor belt; 108. Connecting fixing plate; 109. Mounting bracket; 110. Cutting cylinder. Detailed Implementation

[0038] 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.

[0039] See appendix Figure 1-6 ;

[0040] An automatic cutting device for butt-joining bag roll ends includes a feeding mechanism and an unwinding mechanism spaced apart. The feeding and unwinding mechanisms can be simultaneously mounted on the same base frame or mounted independently. The feeding mechanism includes a feeding frame 1, on which an unwinding shaft 2 is mounted. An unwinding conveyor assembly 3 is mounted in the unwinding and discharge direction of the unwinding shaft 2. The device is characterized in that: the discharge end of the unwinding conveyor assembly 3 is provided with a bag-pressing assembly 4 for pressing the bag roll out; the unwinding mechanism includes a bag-pressing assembly 4 at the inlet end. The feeding and pressing assembly 5 is a bag roll conveyor, and an unwinding transmission assembly is located behind it. The unwinding transmission assembly includes a static unwinding shaft 6 and a moving unwinding shaft 7, which are staggered vertically for conveying the bag roll, and a power shaft 8 located at the rear. The feeding and pressing assembly 5 is a movable structure that can reciprocate along the bag roll conveying direction. A cutting mechanism 9 and a sewing mechanism 10 are installed between the discharging and pressing assembly 4 and the feeding and pressing assembly 5, with a certain distance between them, which is the moving distance of the feeding and pressing assembly 5. An infrared sensor is installed between the discharging conveyor assembly 3 and the unwinding shaft 2 to sense whether the unwinding is complete. The infrared sensor is connected to the back-end controller via a signal line. The controller controls the start and stop of the first tilting cylinder of the discharging and pressing assembly 4, the second tilting cylinder of the feeding and pressing assembly 5, the unwinding transmission assembly, the bag cutting mechanism, and the sewing mechanism.

[0041] Furthermore, the unwinding conveyor assembly 3 includes a deflector roller arranged vertically and horizontally. The two ends of the deflector roller are respectively installed on both sides of the rear end of the feeding frame, and a channel for the bag roll film to pass through is provided between the upper and lower deflector rollers. The deflector roller guides the unwinding end of the bag roll so that it can be unwinded according to a certain channel.

[0042] The discharge bag pressing assembly 4 is located at the discharge end of the unwinding conveyor assembly 3. The discharge bag pressing assembly 4 includes a longitudinally arranged upper pressing plate 41 and a lower pressing plate 42. The lower pressing plate 42 is fixedly mounted on the winding feeder 1 at both ends. The upper pressing plate 41 is positioned directly above the lower pressing plate 42 via a rotating lifting assembly 43. The rotating lifting assembly 43 includes a rotating shaft 431, located between the lower pressing plate 42 and the unwinding conveyor assembly 3. Both ends of the rotating shaft 431 are rotatably mounted on the winding feeder 1. The rotating shaft 431 is connected and fixed to the upper pressing plate 41 via a transmission arm 432. The rotation of the rotating shaft 431 is driven by tilting cylinders 433 at both ends. The extension and retraction of the tilting cylinders drive the rotating shaft to rotate, which in turn drives the transmission arm, thereby controlling the lifting and lowering of the upper pressing plate, thus realizing the pressing and releasing of the bag roll.

[0043] Furthermore, the feeding and pressing bag assembly 5 includes a fixed beam 51 horizontally arranged at the unwinding and discharge end. A laterally movable pressing bag bracket 52 is installed below the fixed beam 51. A lower pressing plate 53 supporting the bag roll film is fixedly installed on the pressing bag bracket 52. A flip-up upper pressing plate 54 is mounted above the lower pressing plate 53. The flipping of the upper pressing plate 54 is pivoted on a pressing shaft 55 located above and behind it. The upper pressing plate 54 and the pressing shaft 55 are connected by a transmission arm 56. The transmission arm 56 is also connected to a flipping cylinder 57 that drives the upper pressing plate 54 to flip. The flipping cylinder 57 is tilted and mounted on the pressing bag bracket 52. The extension and retraction of the flipping cylinder 57 drives the rotating shaft 57 to rotate, which in turn drives the transmission arm 57, thereby controlling the lifting and lowering of the upper pressing plate 54. This allows for the pressing and releasing of the bag roll by the pressing plate 57. The tilted mounting of the flipping cylinder on the pressing bag bracket ensures the fixation of the spatial structure.

[0044] Two parallel transverse guide rails 58 are laid above the bag-pressing bracket 52. A guide block, cooperating with the transverse guide rails 58, is provided on the bottom end face of the fixed beam 51. The rear end of the bag-pressing bracket 52 is moved by a push cylinder 59, whose cylinder body is fixedly mounted on the bottom end face of the fixed beam 51. The extended end of the piston rod is connected to the upper end face of the bag-pressing bracket 52 via a connecting part. The push cylinder extends and retracts, causing the transverse guide rails to move. During this process, the guide blocks guide the movement, and the movement of the transverse guide rails, in turn, moves the bag-pressing bracket. This causes the upper and lower pressure plates of the transverse guide rails to move the clamped bag roll. Since the bag roll has a certain length between the cutting point and the initial clamping point, this length will be vertically downwards due to gravity after movement, thus positioning the bottom end at the sewing mechanism.

[0045] Furthermore, a laterally movable bag-cutting assembly 510 is installed on one side of the fixed beam 51. The bag-cutting assembly 510 includes a cutter bracket 5101. The movement of the cutter bracket 5101 is driven by a guide drive assembly provided on the upper end face of the fixed beam. The bottom end of the cutter bracket 5101 is provided with a tapered guide port 5102 facing the bag roll. The rear end of the guide port 5102 is fixedly installed with a blade 5103 by a pressure plate. The cutting edge of the blade 5103 is located inside the guide port 5102. The guide drive assembly includes a longitudinal guide rail 5104 and a lead screw 5105 that drives the cutter bracket 5101 to move. The upper end of the cutter bracket 5101 is equipped with a slide that guides and cooperates with the longitudinal guide rail 5104 and a guide sleeve that screws into the lead screw 5105. The movement of the cutter bracket 5101 is driven by a motor at the end of the lead screw 5105. The bag rolls are gathered by the tapered guide opening, ensuring the uniformity of the cutting position of the blades. The longitudinal cutting process is driven by a motor-driven screw, which in turn drives the cutter holder to move along the longitudinal guide rail, thus completing the cutting process of the bag rolls.

[0046] Furthermore, the sewing mechanism 10 includes a fixed mounting plate 101, on which a laterally movable sewing assembly is mounted via a slide 102. The movement of the slide 102 is driven by a guide transmission assembly. The sewing assembly includes a horizontally placed handheld sewing machine 103. On one side of the handheld sewing machine 103, a cutting plate 104 perpendicular to the sealing direction for cutting the sealing thread is mounted via a mounting bracket. A cutting blade is fixedly mounted at the front end of the cutting plate 104.

[0047] The guide transmission assembly includes two longitudinal guide rails 106 laid on the mounting plate. The longitudinal guide rails 106 are arranged in parallel. A transversely arranged circulating conveyor belt 107 is arranged below the longitudinal guide rails 106. The bottom end of the slide 102 is fixedly connected to the circulating conveyor belt 107 through a connecting fixing plate 108. The transmission of the circulating conveyor belt 107 is driven by a motor at one end. The base of the handheld sewing machine 103 is fixedly fixed to one side of the slide 102 by a pressure plate. A mounting bracket 109 is fixedly connected to the outside of the pressure plate. A tangent cylinder 110 is fixedly installed on the mounting bracket 109. A tangent plate 104 is installed on the piston rod extension end of the tangent cylinder 110. The handheld sewing machine performs longitudinal sewing operations by driving the slide block along the longitudinal guide rails via the connecting fixed plate through the forward rotation of the motor and the circulating conveyor belt. After the sewing is completed, the thread cutting plate is driven by the thread cutting cylinder to cut the sewing thread of the handheld sewing machine. Then, the sewing assembly is reset by the reverse rotation of the motor and the circulating conveyor belt.

[0048] This application combines unwinding and filling technologies, employing a method of butt-sewing the ends of two bag rolls to achieve continuous bag-making operation. Through the structural design of the unwinding mechanism's unwinding conveyor and the unwinding mechanism's feeding and pressing components, the bag rolls after unwinding from the unwinding shaft can be promptly pressed and fixed. This fixes the end of the previous bag roll side-by-side, leaving a certain length allowance through the cutting mechanism. Simultaneously, the feeding mechanism fixes the beginning of the next bag roll, also leaving a certain length allowance. The two lengths are then sewn together, thus meeting the butt-sewing requirements of the two bag rolls. The process only requires manual placement of the bag roll onto the unwinding shaft, first passing it through the unwinding conveyor. A channel for the bag roll film to pass through is provided between the upper and lower redirecting rollers, and then it passes between the upper pressure plate one and the lower pressure plate two, leaving enough allowance. The rest of the operation is controlled by the background system. After the bag roll on the unwinding shaft is finished, the infrared sensor will send a signal indicating that the unwinding is complete, and then control the subsequent program. Its structure is reasonable, the method is simple and easy to implement. There is no need to manually pass the unwinding moving shaft, unwinding stationary shaft and power roll of the unwinding mechanism step by step, and there is no need for subsequent debugging process, which saves the process and avoids the time-consuming operation caused by changing to a new bag roll. Moreover, it reduces manual intervention, ensures the stability of the accuracy during the unwinding and bag making process, and reduces deviation.

[0049] The continuous bag feeding method using the above structure has the following specific steps:

[0050] S1. Preparations

[0051] First, place the bag roll onto the unwinding shaft of the feeding mechanism. Then, pass the head end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence, and then through the feeding pressing assembly and the unwinding transmission assembly to the bag making mechanism in sequence.

[0052] S2. When the work starts, the power shaft of the unwinding transmission assembly drives the unwinding shaft to continuously unwind until the bag roll on the unwinding shaft is finished. After that, the infrared sensor transmits the unwinding completion signal to the back-end controller. After the back-end controller processes the signal, it starts the flipping cylinder of the discharge pressing bag assembly to press the bag roll discharge end and the unwinding transmission assembly stops unwinding and conveying.

[0053] S3. After the unwinding is stopped, the second cylinder of the flipping cylinder of the feeding and pressing bag assembly at the feeding end of the unwinding mechanism is activated to press the bag roll that is stretched behind the unwound bag roll after the unwinding is completed. Then the bag cutting mechanism is driven to perform the cutting operation.

[0054] S4. After cutting the material, rewind the unwinding shaft and pass the first end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence. A length A is left at the end of the bag roll that passes through, and the downward position of this section is directly opposite the position of the sewing mechanism. Then drive the flipping cylinder to work and press the bag roll corresponding to the length A left.

[0055] S5. Start the push cylinder of the feeding bag pressing assembly to drive the feeding bag pressing assembly to move towards the discharging bag pressing assembly. At this time, the bag roll will have a drooping length B. After this drooping length B droops down, it can ensure that the drooping position is directly opposite the sewing mechanism position and fits with position A in step S4.

[0056] S6. Start the sewing mechanism to sew the bottom ends at points A and B in step S5 from left to right, thereby sewing the previous bag roll and the next bag roll together.

[0057] S7. After the sewing is completed, the second flipping cylinder of the feeding bag pressing assembly and the first flipping cylinder of the discharging bag pressing assembly are activated to release the bag roll. Then, the bag is reset to prepare for the next cutting and sewing operation. The power roll of the unwinding transmission assembly is activated to perform the unwinding operation.

[0058] S8. Once the second bag of rolls is finished, repeat steps S2 through S7.

[0059] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0060] Therefore, the above description is only a preferred embodiment of this application and is not intended to limit the scope of this application; that is, all equivalent modifications made in accordance with the scope of the claims of this application shall be within the protection scope of the claims of this application.

Claims

1. An automatic cutting device for butt joint of bag roll ends, comprising a feeding mechanism and an unwinding mechanism arranged at intervals, wherein the feeding mechanism includes a feeding frame (1), an unwinding shaft (2) is provided on the feeding frame (1), and an unwinding conveyor assembly (3) is provided on the unwinding and discharge direction of the unwinding shaft (2), characterized in that: The discharge end of the unwinding conveyor assembly (3) is provided with an discharge pressing assembly (4) for pressing the bag roll out; the unwinding mechanism includes an infeed pressing assembly (5) for pressing the bag roll out, and an unwinding transmission assembly behind the infeed pressing assembly (5). The unwinding transmission assembly includes an unwinding stationary shaft (6) and an unwinding moving shaft (7) arranged in a staggered manner for conveying the bag roll, and a power shaft (8) located behind. The infeed pressing assembly (5) is a movable structure that can move back and forth along the bag roll conveying direction. A cutting mechanism (9) and a sewing mechanism (10) are set between the discharge pressing assembly (4) and the infeed pressing assembly (5). The cutting mechanism (9) and the sewing mechanism (10) are spaced a certain distance apart, and the distance is the moving distance of the infeed pressing assembly (5).

2. The automatic cutting device for butt welding of bag roll ends according to claim 1, characterized in that: The unwinding conveyor assembly (3) includes a deflector roller arranged in parallel, with the two ends of the deflector roller respectively installed on both sides of the rear end of the feeding frame, and a channel for the bag roll film to pass through is provided between the upper and lower deflector rollers. The discharge bag pressing assembly (4) is located at the discharge end of the unwinding conveyor assembly (3). The discharge bag pressing assembly (4) includes an upper pressing plate (41) and a lower pressing plate (42) arranged longitudinally. The two ends of the lower pressing plate (42) are fixedly installed on the winding feeder (1). The upper pressing plate (41) is located directly above the lower pressing plate (42) through the rotating lifting assembly (43) structure.

3. The automatic cutting device for butt welding of bag roll ends according to claim 2, characterized in that: The rotating lifting assembly (43) includes a rotating shaft (431), which is located between the lower pressure plate (42) and the unwinding conveyor assembly (3). Both ends of the rotating shaft (431) are rotatably mounted on the winding feeder (1). The rotating shaft (431) is connected and fixed to the upper pressure plate (41) through the transmission arm (432). The rotation of the rotating shaft (431) is driven by the tilting cylinders (433) at both ends.

4. The automatic cutting device for butt welding of bag roll ends according to claim 1, characterized in that: The feeding and pressing bag assembly (5) includes a fixed beam (51) arranged laterally at the unwinding and discharge end. A pressing bag bracket (52) that can move laterally is installed below the fixed beam (51). A lower pressing plate (53) that supports the bag roll film is fixedly installed on the pressing bag bracket (52). A flip-up upper pressing plate (54) is mounted above the lower pressing plate (53). The flipping of the upper pressing plate (54) is pivoted on the pressing shaft (55) above it. The upper pressing plate (54) and the pressing shaft (55) are connected by a transmission arm (56). The transmission arm (56) is also connected to a flipping cylinder (57) that drives the upper pressing plate (54) to flip. The flipping cylinder (57) is tilted on the pressing bag bracket (52).

5. The automatic cutting device for butt welding of bag roll ends according to claim 4, characterized in that: Two parallel transverse guide rails (58) are laid above the bag-pressing bracket (52). The bottom end face of the fixed beam (51) is provided with a guide block that guides and cooperates with the transverse guide rails (58). The rear end of the bag-pressing bracket (52) is moved by a push cylinder (59). The cylinder body of the push cylinder (59) is fixedly installed on the bottom end face of the fixed beam (51). The piston rod extension end is connected to the upper end face of the bag-pressing bracket (52) through a connecting part.

6. The automatic cutting device for butt welding of bag roll ends according to claim 4, characterized in that: A laterally movable bag-cutting assembly (510) is installed on one side of the fixed beam (51). The bag-cutting assembly (510) includes a cutter bracket (5101). The movement of the cutter bracket (5101) is driven by a guide drive assembly provided on the upper end face of the fixed beam. The bottom end of the cutter bracket (5101) is provided with a tapered guide port (5102) facing the bag roll. A blade (5103) is fixedly installed at the rear end of the guide port (5102) by a pressure plate. The cutting edge of the blade (5103) is located inside the feed inlet (5102); the guide drive assembly includes a longitudinal guide rail (5104) and a lead screw (5105) that drives the cutter bracket (5101) to move. The upper end of the cutter bracket (5101) is equipped with a slide that guides and cooperates with the longitudinal guide rail (5104) and a guide sleeve that screws into the lead screw (5105). The movement of the cutter bracket (5101) is driven by a motor at the end of the lead screw (5105).

7. The automatic cutting device for butt welding of bag roll ends according to claim 1, characterized in that: The sewing mechanism (10) includes a fixed mounting plate (101). A sewing assembly that can move laterally is mounted on the mounting plate (101) via a slide (102). The movement of the slide (102) is driven by a guide transmission assembly. The sewing assembly includes a horizontally placed handheld sewing machine (103). A cutting plate (104) perpendicular to the sealing direction for cutting the sealing thread is mounted on one side of the handheld sewing machine (103) via a mounting bracket. A cutting blade is fixedly mounted on the front end of the cutting plate (104).

8. The automatic cutting device for butt welding of bag roll ends according to claim 1, characterized in that: The guide transmission assembly includes two longitudinal guide rails (106) laid on the mounting plate. The longitudinal guide rails (106) are arranged in parallel. A transversely arranged circulating conveyor belt (107) is arranged below the longitudinal guide rails (106). The bottom end of the slide (102) is fixedly connected to the circulating conveyor belt (107) through a connecting fixing plate (108). The transmission of the circulating conveyor belt (107) is driven by a motor at one end. The base of the handheld sewing machine (103) is fixedly mounted on one side of the slide (102) by a pressure plate. An installation bracket (109) is fixedly connected to the outside of the pressure plate. A tangent cylinder (110) is fixedly mounted on the installation bracket (109). A tangent plate (104) is installed on the piston rod extension end of the tangent cylinder (110).

9. The automatic cutting device for butt welding of bag roll ends according to claim 1, characterized in that: An infrared sensor for sensing whether the unwinding is complete is provided between the unwinding conveyor assembly (3) and the unwinding shaft (2). The infrared sensor is connected to the back-end controller via a signal line. The controller controls the start and stop of the first flipping cylinder of the unwinding bag pressing assembly (4), the second flipping cylinder of the feeding bag pressing assembly (5), the unwinding transmission assembly, the bag cutting mechanism and the sewing mechanism.

10. A continuous bag feeding method based on the automatic cutting and sewing device for end joining of bag rolls as described in claim 9, characterized in that, The specific steps are as follows: S1. Preparations First, place the bag roll onto the unwinding shaft of the feeding mechanism. Then, pass the head end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence, and then through the feeding pressing assembly and the unwinding transmission assembly to the bag making mechanism in sequence. S2. When the work starts, the power shaft of the unwinding transmission assembly drives the unwinding shaft to continuously unwind until the bag roll on the unwinding shaft is finished. After that, the infrared sensor transmits the unwinding completion signal to the back-end controller. After the back-end controller processes the signal, it starts the flipping cylinder of the discharge pressing bag assembly to press the bag roll discharge end and the unwinding transmission assembly stops unwinding and conveying. S3. After the unwinding is stopped, the second cylinder of the flipping cylinder of the feeding and pressing bag assembly at the feeding end of the unwinding mechanism is activated to press the bag roll that is stretched behind the unwound bag roll after the unwinding is completed. Then the bag cutting mechanism is driven to perform the cutting operation. S4. After cutting the material, rewind the unwinding shaft and pass the first end of the bag roll through the unwinding conveyor assembly and the unwinding pressing assembly in sequence. A length A is left at the end of the bag roll that passes through, and the downward position of this section is directly opposite the position of the sewing mechanism. Then drive the flipping cylinder to work and press the bag roll corresponding to the length A left. S5. Start the push cylinder of the feeding bag pressing assembly to drive the feeding bag pressing assembly to move towards the discharging bag pressing assembly. At this time, the bag roll will have a drooping length B. After this drooping length B droops down, it can ensure that the drooping position is directly opposite the sewing mechanism position and fits with position A in step S4. S6. Start the sewing mechanism to sew the bottom ends at points A and B in step S5 from left to right, thereby sewing the previous bag roll and the next bag roll together. S7. After the sewing is completed, the second flipping cylinder of the feeding bag pressing assembly and the first flipping cylinder of the discharging bag pressing assembly are activated to release the bag roll. Then, the bag is reset to prepare for the next cutting and sewing operation. The power roll of the unwinding transmission assembly is activated to perform the unwinding operation. S8. Once the second bag of rolls is finished, repeat steps S2 through S7.

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