Edge folding and sewing mechanism
By designing a folding edge device and a guiding structure, the problems of slippage and low efficiency of sewing machines in thin bag packaging were solved, achieving a highly efficient and stable sewing process that can adapt to packaging bags of different thicknesses.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGXI RES INST OF MECHANICAL IND
- Filing Date
- 2025-06-09
- Publication Date
- 2026-05-19
AI Technical Summary
Existing sewing machines are prone to slippage and low sewing efficiency when packaging thin bags, especially when operating in dusty environments, where it is difficult to increase the speed of the guide structure.
A folding and sewing mechanism was designed, including a folding assembly and a guide belt assembly. The folding plate flattens and tightens the bag opening, and combined with adjustable folding pads and adaptive guide blocks, it achieves stable guidance and efficient sewing of packaging bags of different thicknesses.
It improves sewing efficiency, reduces the probability of sewing failure, ensures stable operation in dusty environments, and adapts to the guiding needs of packaging bags of different thicknesses.
Smart Images
Figure CN224258961U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging and control technology, and in particular to a folding and sewing mechanism. Background Technology
[0002] In industries that require packaging materials, such as sugar, food, feed, chemical, starch, pharmaceutical, fertilizer, and nano-calcium carbonate industries, powders and granules need to be bagged, for example, using inner and outer bags as packaging bags.
[0003] For example, the Chinese invention patent "A Fully Automatic Production Line for Packaged Inner and Outer Bag Material Packaging, Publication No. CN110697149A" includes a frame, a bag placing frame, a bag picking mechanism, a bag placing mechanism, a rotating mechanism, a loading hopper, a bag clamping mechanism, a bag supporting mechanism, a bag inserting mechanism, a packaging scale, a discharge hopper, a discharge sealing mechanism, an air squeezing mechanism, an inner bag sealing mechanism, an inner bag clamping and moving mechanism, an inner bag inserting mechanism, an outer bag opening mechanism, a sewing and conveying mechanism, a sewing machine, a belt conveyor, a vision camera, and a rejection mechanism. It can operate smoothly in dusty environments without jamming during shrinkage and expansion; the sewing and conveying mechanism clamps both sides of the sewing thread at the opening of the outer bag of the packaged bag for sewing, preventing misalignment; the vision camera identifies defective products after sewing, which are then rejected by the rejection mechanism, improving the product pass rate.
[0004] As mentioned above, sewing machine structures generally use direct sewing. However, packaging bags are relatively thin, and the guiding structure has less force to hold the packaging bag and the friction is relatively small. As a result, a higher speed of the guiding structure will cause slippage, making it difficult to increase the sewing speed to more than 8 bags, resulting in low sewing efficiency. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned problems by providing a folding and sewing mechanism that can fold the bag opening edge flat and tightly, facilitating its insertion into the sewing machine. This folding and sewing structure improves sewing efficiency and reduces the probability of sewing failures.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] The hemming and sewing mechanism includes a frame, a sewing machine unit, a thread holder, and a guide belt assembly. The sewing machine unit is installed at the rear end of the frame, and the thread holder is installed at the front end. The frame includes a left plate at the left end and a right plate at the right end, with a material bag moving channel formed between the left and right plates. The guide belt assembly is installed on the left and right sides of the moving channel at the bottom of the frame. It also includes a hemming assembly, which includes a hemming plate, a hemming shaft, a hemming swing arm, a hemming drive, a bending plate assembly, and a hemming pad. The bending plate assembly is located in front of the entrance of the sewing machine unit and includes a left bending plate and a right bending plate. The bending plates are respectively installed on the left and right sides of the moving channel at the front end of the left and right plates. Two folding pads are arranged longitudinally at the front end of the right plate. The folding shaft is rotatably installed on the folding pads. The folding swing arm is installed on the folding shaft. The right end of the folding plate presses against the bending plate assembly. The left end of the folding plate extends downward along the left bending plate. One end of the folding swing arm is installed at the right end of the folding plate. The other end of the folding swing arm is hinged to the telescopic end of the folding drive component. The fixed end of the folding drive component is hinged to the right plate. When driven by the folding drive component, the folding plate can rotate around the folding shaft to the right side of the moving channel or press against the bending plate assembly.
[0008] The guide belt assembly includes a tensioning wheel assembly, a V-belt, and guide blocks. Several tensioning wheel assemblies arranged in a B-shape are installed on the left and right plates, and each tensioning wheel assembly is connected to a V-belt so that the V-belt forms a guide section in the moving channel. Several guide blocks are installed on the left and right sides of the moving channel of the left and right plates, and the guide section of each V-belt is closely arranged against the guide block on the same side. The guide sections of two V-belts are arranged opposite each other with a certain guide gap, so as to clamp and guide the material bag (the packaging bag containing the material).
[0009] The folding drive is a cylinder; a three-axis cylinder or a standard cylinder with higher performance can be selected depending on the actual needs. The longitudinal length of the folding plate is 1-1.5 times the width of the bag opening.
[0010] The folding arm includes a connecting rod and a crank arm. One end of the crank arm is hinged to the telescopic end of the folding drive component, and the other end of the crank arm is mounted on the folding shaft. One end of the connecting rod is mounted on the folding shaft, and the other end of the connecting rod is mounted on the right end of the folding plate. At least two connecting rods are arranged longitudinally to improve the connection and the stability of the downward folding.
[0011] As mentioned above, the right end of the folding plate presses the bag opening down onto the bending plate assembly, while the left end of the folding plate presses down on the bag opening against the left bending plate, resulting in a smooth and tight fold at the bag opening, facilitating entry into the sewing machine assembly for sewing. Folding pads are used to elevate the folding shaft, allowing the folding plate to rotate with a smaller radius when pressing down on the bending plate assembly and when leaving the open movement channel, thus reducing the extension and retraction stroke of the folding drive component.
[0012] Based on the aforementioned solution, in an improved solution, in order to solve the problem of adjusting the distance between the left end of the folding plate and the left bending plate, the folding pad of the sewing mechanism is equipped with a horizontally extending strip hole. The folding pad is installed on the right plate with adjustable spacing through the strip hole and bolt. In this way, the horizontal position can be adjusted according to the thickness of the packaging bag and the actual loosening situation during operation, thereby adjusting the distance between the left end of the side plate and the left bending plate.
[0013] Based on the aforementioned solution, in an improved solution, in order to solve the problem that the bag opening may be blocked by the bending plate group, the front ends of the left and right bending plates of the sewing mechanism are bent outward in the horizontal direction to form guide openings so as to guide the bag opening into the bending plate group.
[0014] Based on the aforementioned solution, in an improved solution, in order to solve the problem of adapting to different packaging bag thicknesses, the guide block of the sewing mechanism includes a movable guide block and a fixed guide block. Several fixed guide blocks are arranged on the right plate, and several movable guide blocks are arranged on the left plate. When the movable guide block is subjected to lateral pressure on the right side, it can press the guide section of the left triangular belt closer to the guide section of the right triangular belt so as to adapt to the guidance of packaging bags of different thicknesses. Preferably, the movable guide block includes a guide pressure block, an elastic support, a guide base plate, guide columns, and a guide sleeve. Two guide columns are installed longitudinally and sequentially on the left plate. The guide base plate is installed on the left side of the two guide columns via the guide sleeve, and there is a certain self-adjusting gap between the guide base plate and the two guide columns. The guide pressure block is installed on the guide base plate via the elastic support and is located between the two guide columns. Under the restoring force of the elastic support, the guide pressure block can press the guide section of the left V-belt closer to the guide section of the right V-belt. In this way, the elastic support with springs or elastic elements as the core automatically presses by utilizing its elastic restoring force, which can automatically adapt to clamping and guiding different packaging bag thicknesses, especially for packaging bags of similar thicknesses under certain efficiency conditions.
[0015] By adopting the above technical solution, this utility model has the following beneficial effects:
[0016] This utility model's folding and sewing mechanism features a folding assembly at the front of the sewing machine unit. The right end of the folding plate presses the bag opening down onto the bending plate assembly, while the left end of the folding plate presses down on the bag opening against the left bending plate. This results in a smooth and tight fold at the bag opening, facilitating entry into the sewing machine unit for sewing. A folding pad elevates the folding shaft, allowing the folding plate to rotate with a smaller radius when pressing down on the bending plate assembly and when leaving the open movement channel, thus reducing the extension and retraction stroke of the folding drive component. After the bag opening is folded, it becomes twice as thick, the guide structure is less prone to slippage, and the sewing speed is high, resulting in high sewing efficiency. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 2 yes Figure 1 A schematic diagram of the folded edge component structure. Figure 3 yes Figure 1 The folded edge component leaves the moving channel state in a partial front view. Figure 4 yes Figure 1 Side view of the folded-edge swing arm. Figure 5 yes Figure 1 Rear view. Figure 6 yes Figure 1 Side view. Figure 7 yes Figure 1 A bottom view. Figure 8 yes Figure 7 A magnified view of a portion of the image.
[0018] In the attached diagram, the components are: left bending plate 1, right bending plate 2, left plate 3, guide sleeve 4, front guide column 5, guide base plate 6, rear guide column 7, wheel axle 8, pulley end cap 9, tension wheel 10, elastic support 11, spring 12, guide pressure block 15, fixed guide block 16, V-belt 17, right plate 18, shaft end retaining ring 19, sewing sliding assembly 20, sewing machine unit 21, transfer power assembly 22, first screw 24, M16 nut 26, second screw 27, third screw 30, folding assembly 34, thread bracket 35, fourth screw 36, angular contact ball bearing 39, reflector 40, and photoelectric base 41. Detailed Implementation
[0019] Example 1
[0020] See Figures 1-8The figure shows some dimensional examples. The hemming and sewing mechanism of this embodiment 1 includes a plate frame (made of AISI 304 material), a sewing machine unit 21, a thread holder 35, and a guide belt assembly. The sewing machine unit 21 is installed at the rear end of the plate frame, and the thread holder 35 is installed at the front end of the plate frame. The plate frame includes a left plate 3 at the left end and a right plate 18 at the right end, and a moving channel for the material bag is formed between the left plate 3 and the right plate 18. The guide belt assembly is installed on the left and right sides of the moving channel at the bottom end of the plate frame. It also includes a hemming assembly 34, which includes a hemming plate 341, a hemming shaft 3421, a hemming swing arm 342, a hemming drive component 344, a bending plate assembly, and a hemming pad 343. The bending plate assembly is arranged in front of the entrance of the sewing machine unit 21. The bending plate assembly includes a left bending plate 1 and a right bending plate 2. The left bending plate 1 and the right bending plate 2 are respectively connected to the sewing machine unit 21. A second screw (M8*16 socket head cap screw) 27 is installed through the strip hole and a standard elastic washer bolt is installed on the left and right sides of the moving channel at the front end of the left plate 3 and the right plate 18. Two folding pads 343 are arranged longitudinally at the front end of the right plate 18. The folding shaft 3421 is rotatably installed on the folding pad 343. The folding swing arm is installed on the folding shaft 3421. The right end of the folding plate 341 is pressed against the bending plate assembly. The left end of the folding plate 341 extends downward along the left bending plate 1. One end of the folding swing arm is installed at the right end of the folding plate 341. The other end of the folding swing arm is hinged to the telescopic end of the folding drive 344. The fixed end of the folding drive 344 is hinged to the right plate 18. When driven by the folding drive 344, the folding plate 341 can rotate around the folding shaft to the right side of the moving channel or press against the bending plate assembly.
[0021] The sewing machine unit, thread holder, and guide belt assembly are all existing components. For example, the sewing machine unit is equipped with a transfer power assembly 22, or it is mounted on a conventional frame via a plate frame. Photoelectric detection trigger switches are also used to monitor the position of material bags. Their connections and controls utilize existing technologies and will not be elaborated upon here. The folding drive components, as drive devices, are all existing equipment, such as motor drives, hydraulic cylinder drives, and pneumatic cylinder drives equipped with corresponding air sources, solenoid valves, and controllers for connection and control. Their connections and controls utilize existing technologies and will not be elaborated upon here. This application applies the drive components to form a folding machine unit, enabling it to fold, and adaptively improves and lengthens the guide belt assembly to accommodate sewing and folding guidance.
[0022] The guide belt assembly includes a tensioning pulley assembly, a V-belt (B-type V-belt) 17, and guide blocks (made of 6061 alloy). The left plate 3 and the right plate 18 are respectively equipped with several tensioning pulley assemblies arranged in a B-type configuration, and each tensioning pulley assembly is connected to a V-belt so that the V-belt forms a guide section in the moving channel. Several guide blocks are respectively installed on the left and right sides of the moving channel of the left and right plates. The guide section of each V-belt is closely arranged against the guide block on the same side, and the guide sections of two V-belts are arranged opposite each other with a certain guide gap. As shown in the figure, taking a B-shaped distribution of four tensioning wheels 10 as an example, one of them acts as the driving wheel, connected to the conveying power assembly 22 via a shaft end retaining ring 19 and a third screw (M6*15 socket head cap screw) 30. The other three act as driven wheels, connected and fixed via axle 8, pulley end cap 9, M16 nut 26, and angular contact ball bearing (e.g., double row angular contact ball bearing 3204A-2RS) 39. Regarding the guide clearance, for example, if the combined wall thickness of the two sides of the packaging bag opening is 0.5mm, the guide clearance for the two V-belts is 0.45mm or 0.5mm. For the guide blocks, as shown in the figure, fixed guide blocks 16 can be used. Three fixed guide blocks 16 are bolted to the left and right plates using slotted holes and the first screw (M10*25 socket head cap screw) 24. This forms the guide belt assembly, which can clamp and guide the material bag (packaging bag or composite bag containing materials).
[0023] Taking a cylinder as an example, the folding drive can be described using a three-axis cylinder or a standard cylinder with higher performance, depending on the actual conditions. Existing supporting equipment such as an air source and solenoid valves can be configured to achieve the telescopic drive.
[0024] The folding arm 342 includes a connecting rod 3422 and a crank arm 3423. One end of the crank arm 3422 is hinged to the telescopic end of the folding drive 344, and the other end of the crank arm 3422 is mounted on the folding shaft 3421. One end of the connecting rod 3423 is mounted on the folding shaft 3421, and the other end of the connecting rod 3423 is mounted on the right end of the folding plate 341. At least two connecting rods are arranged longitudinally in sequence, as shown in the figure (using two connecting rods as an example), which can improve the connection and the stability of the downward folding.
[0025] The longitudinal length of the folding plate is 1-1.5 times the width of the bag opening, for example, 1.1 times. The longitudinal length of the folding plate is a certain length larger than the width of the bag opening, which helps to accommodate movement errors and completely cover the folding edge pressed down at the bag opening.
[0026] As described above, during operation, the drive wheel drives the V-belts to rotate. The guide sections of the two V-belts move from the longitudinal front end to the longitudinal rear end, causing the material bag to move longitudinally backward. When the material bag has completely moved to the pressing area of the folding plate, the photoelectric switch installed at the reflector 40 and photoelectric base 41 is triggered, activating the folding cylinder to extend and push the folding plate. The folding plate flips down from the position of the open movement channel (located on the right side of the movement channel) and presses down on the bending plate group position, thus achieving the folding. Afterward, the guide belt and the configured conveyor belt continue to move the material bag. The folded bag opening is sent out from the bending plate group and the folding plate, and then enters the sewing machine group inlet to complete the sewing. A single set of guide belts can complete the folding and sewing guidance.
[0027] As mentioned above, a folding assembly is installed at the front of the sewing machine unit. The right end of the folding plate presses the bag opening down onto the bending plate assembly, while the left end of the folding plate presses down on the bag opening against the left bending plate. The folded edge of the bag opening is flat and tight, facilitating entry into the sewing machine unit for sewing. A folding pad is used to elevate the folding shaft, allowing the folding plate to flip with a smaller radius when pressing down on the bending plate assembly and when leaving the open movement channel, which helps to reduce the extension and retraction stroke of the folding drive component. After the bag opening is folded, it becomes twice as thick, the guide structure is less prone to slippage, and the sewing speed is high, resulting in high sewing efficiency.
[0028] Example 2
[0029] Based on Example 1, Example 2 has better edge spacing performance.
[0030] like Figures 1-8 As shown, in order to solve the problem of adjusting the gap between the left end of the folding plate and the left bending plate, the folding pad 343 of the sewing mechanism is equipped with a horizontally extending strip hole. The folding pad is installed on the right plate with adjustable spacing through the strip hole and bolt. In this way, the horizontal position can be adjusted according to the thickness of the packaging bag and the loosening caused by vibration during actual operation, thereby adjusting the gap between the left end of the side plate and the left bending plate.
[0031] Example 3
[0032] Based on Embodiment 1 or Embodiment 2, Embodiment 3 has a guide port structure.
[0033] like Figures 1-8 As shown, in order to solve the problem that the bag opening may be blocked by the bending plate group, the front ends of the left bending plate 1 and the right bending plate 2 of the sewing mechanism are bent outward in the horizontal direction to form guide openings so as to guide the bag opening into the bending plate group.
[0034] Example 4
[0035] Based on Embodiment 1, Embodiment 2, or Embodiment 3, Embodiment 4 has a self-adjusting and adaptive guiding structure.
[0036] like Figures 1-8 As shown, in order to solve the problem of adapting to different packaging bag thicknesses, the guide block of the sewing mechanism includes a movable guide block and a fixed guide block 16. Several fixed guide blocks 16 are arranged on the right plate 18, and several movable guide blocks are arranged on the left plate 3. When the movable guide block is subjected to lateral pressure on the right side, it can press the guide section of the left triangular belt closer to the guide section of the right triangular belt so as to adapt to the guidance of packaging bags of different thicknesses.
[0037] Preferably, the movable guide block includes a guide pressure block 15, an elastic support 11, a guide base plate 6, guide columns (front guide column 5 and rear guide column 7) and a guide sleeve 4. The two guide columns are installed longitudinally on the left plate in sequence. The guide base plate 6 is installed on the left side of the two guide columns through the guide sleeve 4 and the fourth screw (M10*50 socket head cap screw) 36. The guide base plate 6 and the two guide columns have a certain self-adjusting gap. The guide pressure block 15 is installed on the guide base plate 6 through the elastic support 11. The guide pressure block 15 is located between the two guide columns. Under the restoring force of the elastic support 11, the guide pressure block 15 can press the guide section of the left V-belt closer to the guide section of the right V-belt.
[0038] Thus, the elastic support 11, using spring 12 or an elastic element as the core, along with screws and elastic washers, automatically clamps using its elastic restoring force. This automatically adapts to clamping and guiding different packaging bag thicknesses, especially for packaging bags of similar thicknesses with a certain level of efficiency. For example, for heavy packaging bags with single layers of 0.18mm and 0.25mm, if the restoring force is sufficient, replacing the 0.25mm heavy packaging bag with a 0.18mm heavy packaging bag causes the guide block to be compressed and extend outward, pressing the guide section of the left V-belt closer to the guide section of the right V-belt, thus achieving clamping and guiding.
[0039] It should be noted that the examples of the above embodiments can preferably be combined with one or more of each other according to actual needs, and the accompanying drawings of multiple examples adopt a set of combined technical features, which will not be described in detail here.
[0040] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.
[0041] The above description is a detailed explanation and illustration of the preferred embodiments of the present utility model. However, these descriptions are not intended to limit the scope of protection claimed by the present utility model. All equivalent changes or modifications made under the technical teachings of the present utility model shall fall within the patent protection scope covered by the present utility model.
Claims
1. A hemming and sewing mechanism, comprising a frame, a sewing machine assembly, a thread holder, and a guide belt assembly, wherein the sewing machine assembly is installed at the rear end of the frame, the thread holder is installed at the front end of the frame, the frame includes a left plate at the left end and a right plate at the right end, and a moving channel for a material bag is formed between the left and right plates, and the guide belt assembly is installed on the left and right sides of the moving channel at the bottom end of the frame; characterized in that: It also includes a folding assembly, which comprises a folding plate, a folding shaft, a folding swing arm, a folding drive, a bending plate assembly, and folding pads. The bending plate assembly is arranged in front of the entrance of the sewing machine assembly. The bending plate assembly includes a left bending plate and a right bending plate. The left and right bending plates are respectively installed on the left and right sides of the moving channel at the front end of the left and right plates. Two folding pads are arranged longitudinally at the front end of the right plate. The folding shaft is rotatably mounted on the folding pads. The folding plate has a folding arm mounted on a folding shaft. The right end of the folding plate presses against the bending plate assembly. The left end of the folding plate extends downward along the left bending plate. One end of the folding arm is mounted on the right end of the folding plate. The other end of the folding arm is hinged to the telescopic end of the folding drive component. The fixed end of the folding drive component is hinged to the right plate. When driven by the folding drive component, the folding plate can rotate around the folding shaft to the right side of the moving channel or press against the bending plate assembly.
2. The hemming and sewing mechanism according to claim 1, characterized in that: The folding arm includes a connecting rod and a curved arm. One end of the curved arm is hinged to the telescopic end of the folding drive component, and the other end of the curved arm is mounted on the folding shaft. One end of the connecting rod is mounted on the folding shaft, and the other end of the connecting rod is mounted on the right end of the folding plate. At least two connecting rods are arranged sequentially along the longitudinal direction. The folding drive component is a cylinder, and the longitudinal length of the folding plate is 1-1.5 times the width of the bag opening.
3. The hemming and sewing mechanism according to claim 1, characterized in that: The folded edge pad is equipped with a horizontally extending strip hole, and the folded edge pad is installed on the right plate with adjustable spacing through the strip hole and bolts.
4. The hemming and sewing mechanism according to claim 1, characterized in that: The front ends of the left and right bending plates are bent outwards laterally to form guide openings.
5. The hemming and sewing mechanism according to claim 1, characterized in that: The guide belt assembly includes a tensioning wheel assembly, a V-belt, and guide blocks. The left and right plates are each equipped with a number of tensioning wheel assemblies arranged in a B-shape, and each tensioning wheel assembly is connected to a V-belt so that the V-belt forms a guide section at the moving channel. Several guide blocks are installed on the left and right sides of the moving channel of the left and right plates, and the guide section of each V-belt is closely arranged against the guide block on the same side. The guide sections of two V-belts are arranged opposite each other with a certain guide gap.
6. The hemming and sewing mechanism according to claim 5, characterized in that: The guide block includes a movable guide block and a fixed guide block. Several fixed guide blocks are arranged on the right plate, and several movable guide blocks are arranged on the left plate. When the movable guide block is subjected to lateral pressure from the right side, it can press the guide section of the left triangular belt closer to the guide section of the right triangular belt.
7. The hemming and sewing mechanism according to claim 6, characterized in that: The movable guide block includes a guide pressure block, an elastic support, a guide base plate, guide columns, and a guide sleeve. Two guide columns are installed longitudinally and sequentially on the left plate. The guide base plate is installed on the left side of the two guide columns through the guide sleeve, and there is a certain self-adjusting gap between the guide base plate and the two guide columns. The guide pressure block is installed on the guide base plate through the elastic support and is located between the two guide columns. Under the action of the restoring force of the elastic support, the guide pressure block can press the guide section of the left V-belt closer to the guide section of the right V-belt.