Blowing material folding mechanism, material folding method and sewing machine

Abstract

The invention discloses a blowing material folding mechanism, a material folding method and a sewing machine, the blowing material folding mechanism comprises a material fixing window for realizing fabric positioning, the material fixing window is provided with a blowing mechanism and a folding knife mechanism which are opposite and linked, the blowing mechanism is provided with an air outlet for realizing first folding, and the folding knife mechanism is provided with an air outlet for realizing second folding. The folding knife mechanism is internally provided with an adjustable folding knife assembly which is used for achieving secondary folding and provided with insertion teeth. Linkage folding is conducted through the blowing mechanism and the folding knife assembly with the insertion teeth, the blowing mechanism applies pressure to a cloth seam allowance to conduct first folding, the folding knife assembly shovels the cloth seam allowance towards the two sides through the folding knife insertion teeth to complete second folding, and therefore the folding action is completed. According to the structure, a traditional upper folding knife does not need to penetrate through a material fixing window to conduct material folding, and therefore material folding can be conducted on pockets with different sizes and widths without changing the folding knife size. The operation time of the whole technological process can be effectively shortened, the material folding efficiency is high, and the cost is low.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to an air-blowing folding mechanism and folding method, and a sewing machine. Background Technology

[0002] Clothing pocket opening refers to creating the structure needed for subsequent pocket formation on fabric. The general process involves laser cutting on the garment, placing the fabric on a workbench with a slotted structure, using the folding structure to move the folded edge of the pocket opening to the four sides to complete the folding, and finally shaping it for subsequent sewing and other uses.

[0003] In the prior art, for example, Chinese utility model patent with authorization announcement number CN212955653U discloses a bag opening machine for processing the bag opening of clothing. The machine has a bag folding mechanism, a material fixing mechanism and a shaping mechanism above its worktable. The material fixing mechanism clamps the clothing and delivers it to the feeding port. Then the bag folding mechanism folds the bag opening from top to bottom through the slot. Finally, the shaping mechanism shapes the bag opening after folding.

[0004] Traditional structures require the material to pass through a fixed-size window during the folding process. The fixed-size window needs to switch parts according to the folding size, which means that different folding blades need to be changed to adapt to different working conditions when folding different sized pockets. Moreover, the existing structure is relatively complex, and after the change is completed, it needs to be adjusted to achieve a stable folding state. Even experienced operators need to spend a lot of time on the adjustment.

[0005] In addition, in order to cope with different folding sizes, multiple sets of folding knives need to be prepared for replacement. Furthermore, the descent height of the folding knives needs to be adjusted for different thicknesses of sewing materials, which also requires a lot of time for adjustment. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of existing folding mechanisms failing to meet the requirements of universal design. These mechanisms require multiple sets of different folding blades for different folding sizes, and the folding blade's descent height needs to be adjusted for different material thicknesses, resulting in complex, time-consuming, and unstable operations with low efficiency and high costs. The invention provides a pneumatic folding mechanism, method, and sewing machine that eliminates the need for changing folding blades, meets the folding needs of different pocket sizes, and accommodates different material thicknesses without adjusting the folding blade's descent height. It offers high versatility, wide applicability, simple structure, convenient operation, good stability, and high folding accuracy.

[0007] The technical solution adopted by this invention to achieve its objective is: an air-blowing folding mechanism, comprising a material positioning window for positioning the fabric, and an air-blowing mechanism and a folding knife mechanism arranged opposite and linked within the material positioning window. The air-blowing mechanism is provided with an air outlet for performing the first fold, and the folding knife mechanism is provided with an adjustable folding knife assembly with insert teeth for performing the second fold. In this air-blowing folding mechanism, an air-blowing mechanism and a folding knife mechanism are arranged opposite each other within the material positioning window. The air-blowing mechanism blows air to perform the first fold on the fabric with a stop, and the folding knife assembly with insert teeth performs the second fold, thereby completing the folding operation. Since there is no upper folding blade assembly, there is no need to replace the upper folding blade. The air blowing mechanism can blow and press fabrics with stoppers of different sizes. Using air pressure to fold the material can meet various folding sizes. There is no need to adjust the height of the folding blade. Only the air blowing mechanism needs to be raised and lowered. The first folding is achieved by air pressure. Then, the adjustable folding blade assembly with insert teeth can achieve stable folding of different thicknesses and sizes. The insert teeth on the folding blade assembly can ensure that the fabric is flattened smoothly and avoid unevenness.

[0008] Preferably, the air blowing mechanism includes an air blowing device and an air blowing height adjustment mechanism. The air blowing height adjustment mechanism employs an automatic lifting adjustment device, and the air blowing device is mounted on the automatic lifting adjustment device and its lifting is controlled by the automatic lifting adjustment device. The air blowing height adjustment mechanism drives the lifting of the air blowing device, thereby adjusting the air blowing height and pressure to meet different material bending needs. The automatic lifting adjustment device provides stable control, high precision, and no pollution.

[0009] Preferably, the air-blowing device includes a manifold with an internal air passage. One end of the manifold has an air inlet connected to the air passage, and the air outlet is located on the manifold and connected to the internal air passage. The air outlet can be a plurality of air holes on the manifold; or the air outlet can be one or more air slots on the manifold; or the air outlet can be a plurality of air pipes on the manifold. As a preferred embodiment, the air-blowing device uses a manifold with an air passage inside and a plurality of air outlets connected to the air passage. The air outlets apply pressure to the fabric, blowing it towards the folding blade for secondary folding. This design is simple in structure and operation, effectively avoiding the need to change folding blades of different sizes for folding different pocket widths. It offers high operational efficiency and low cost. The structure of the air outlet can be customized as needed, without specific limitations. For example, it can be a plurality of air holes, a plurality of air pipes, or air slots, etc.

[0010] Preferably, the folding knife assembly includes a pair of openable and closable folding knives, each with several folding knife teeth at its end and a flattening structure on the teeth. The folding knife assembly mainly comprises a pair of openable and closable folding knives with several folding knife teeth at their ends. Folding is achieved through these teeth, resulting in uniform and flat folding with good effect. Furthermore, the folding knife with folding knife teeth structure also accommodates folding materials of different areas, offering good applicability and versatility.

[0011] Preferably, the folding knife mechanism further includes a folding width adjustment mechanism for controlling the opening and closing movement of the folding knife assembly and a folding height adjustment mechanism for controlling the lifting and lowering of the folding knife assembly. The folding knife mechanism primarily achieves its opening and closing operations through the folding width adjustment mechanism, controlling the opening width according to the size of the folded material, making operation convenient, efficient, and precise. Simultaneously, to achieve the lifting and lowering of the folding knife mechanism, a folding height adjustment mechanism is provided to control the overall lifting and lowering of the folding knife mechanism, enabling operations such as folding reset.

[0012] Preferably, the folding width adjustment mechanism adopts a servo motor screw drive mechanism; or the folding width adjustment mechanism adopts a hydraulic parallel opening and closing mechanism. The folding width adjustment mechanism can be implemented by a servo motor-driven screw drive or by a hydraulic parallel opening and closing mechanism, as long as it can achieve precise transmission opening and closing.

[0013] Preferably, the folding height adjustment mechanism employs a screw drive mechanism, a cylinder drive mechanism, or a pulley drive mechanism. The folding height adjustment mechanism can utilize various transmission mechanisms such as screw drive, cylinder drive, or pulley drive.

[0014] Preferably, the air-blowing folding mechanism further includes a large template assembly, a folding clamping plate assembly, a clamping plate lifting mechanism, a material fixing plate mechanism, and a folding clamping plate locking mechanism. The air-blowing folding mechanism also includes a large template assembly for supporting the entire mechanism, a folding clamping plate assembly for clamping and positioning the folded bag, a clamping plate lifting mechanism for controlling the lifting and lowering of the folding clamping plate assembly, a material fixing plate mechanism for forming and adjusting the size of the material fixing window, and a folding clamping plate locking mechanism for clamping and positioning the folding clamping plate assembly to maintain clamping stability.

[0015] Preferably, the folding clamp assembly includes a flat folding clamp plate stacked vertically and replaceable toothed folding clamp plates. A material-fixing opening is provided in the center of each folding clamp plate, and several toothed grooves are provided on both sides of the opening. The folding clamp assembly mainly includes a flat folding clamp plate and replaceable folding clamp plates that can be adjusted for different sizes and thicknesses. The folding clamp plates have a material-fixing opening, and several toothed grooves are provided on both sides of the opening. These grooves engage with the teeth of the folding blade, ensuring smooth and neat folding while also meeting the needs of folding pockets of different widths.

[0016] Preferably, the adjustable folding knife assembly with insert teeth and the folding clamp with insert tooth grooves cooperate to form a toothed adjustable folding structure. This toothed adjustable folding structure allows for adjustment of the folding width, meeting the needs of folding pockets of different sizes. It eliminates the need for frequent folding knife replacements, is simple in structure, easy to use, highly efficient, and precise.

[0017] Preferably, the large template assembly includes a large template; the material-fixing plate mechanism includes a material-fixing plate switch, a front material-fixing plate and a rear material-fixing plate driven by the material-fixing plate switch; when the front and rear material-fixing plates are in a combined state, they enclose to form the material-fixing window. Controlling the front and rear material-fixing plates with the material-fixing plate switch to enclose material-fixing windows of different sizes provides wide applicability and good versatility.

[0018] Preferably, the clamping plate lifting mechanism adopts a cylinder-controlled sliding lifting structure or an electric cylinder-controlled sliding lifting structure; the clamping plate lifting mechanism is connected to the folding clamping plate assembly through a clamping plate guide rail connecting bracket.

[0019] Preferably, the folding clamp locking mechanism employs a pneumatic linkage clamping structure. The folding clamp locking mechanism includes a folding clamp lifting lever hinged to a folding cylinder. The folding clamp is clamped left and right by a pair of folding clamp lifting levers, achieving the locking and positioning function.

[0020] The technical solution adopted by the present invention to achieve its second objective is: an air-blowing material bending method, which employs the aforementioned air-blowing material bending mechanism, and includes the following steps: S1: Convey the fabric with the fabric stop to the setting window; S2: The air blowing mechanism descends, and the air blowing device blows air towards the fabric stop, pressing the fabric stop towards the side of the fixed window facing the folding knife, thus achieving the first folding of the material; S3: The folding clamp assembly below the large template assembly descends; S4: The folding blade assembly moves upward, causing the folding blade to rise and pass through the fixed material opening, inserting into the stop gap of the fabric; S5: The air blowing mechanism rises and resets, and the folding width adjustment mechanism controls the folding blade to open to both sides. By unfolding the folding blade, the fabric stop is covered and flattened towards the lower plate of the front and rear fixed pieces, respectively, to achieve the second folding. S6: The folding clamp assembly and the folding knife assembly are reset, completing the folding process.

[0021] This air-blowing folding method uses an air-blowing mechanism and a toothed folding blade assembly to fold the fabric. First, the air-blowing mechanism applies pressure to the cut fabric edge at the designated window, forcing the edge against the window and towards the other side. The folding blade assembly then flattens the edge to both sides, completing the second fold. This structure eliminates the need for the traditional folding blade to pass through the designated window, allowing for folding of different pocket widths without changing the blade size. It effectively reduces the overall process time, offering high folding efficiency and low cost.

[0022] The technical solution adopted by the present invention to achieve its third inventive objective is: a sewing machine, including the aforementioned air blowing and folding mechanism.

[0023] The beneficial effects of this invention are: the air-blowing folding mechanism, folding method, and sewing machine can meet the needs of folding materials for pockets of different sizes without the need to change the folding blade, and can meet the needs of sewing materials of different thicknesses without adjusting the folding blade's descent height. It has high versatility, wide applicability, simple structure, convenient operation, good stability, high folding accuracy, and low cost.

[0024] The fabric is folded by a linkage between an air-blowing mechanism and a toothed folding blade assembly. The air-blowing mechanism applies pressure to the fabric's edge for the first fold, and the folding blade assembly flattens the edge to both sides using the folding blade's teeth to complete the second fold. This structure eliminates the need for the traditional folding blade to pass through a fixed-size window, allowing for folding of different pocket widths without changing the folding blade size. This effectively reduces the overall process time, resulting in high folding efficiency and low cost. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of one structure of the air blowing and material folding mechanism of the present invention.

[0026] Figure 2 This is a schematic diagram of one structure of the air blowing mechanism in this invention.

[0027] Figure 3 This is a schematic diagram of the air blowing mechanism from another angle in this invention.

[0028] Figure 4 This is a cross-sectional view of the air blowing device in this invention.

[0029] Figure 5 This is a schematic diagram of one structure of the folding knife mechanism in this invention.

[0030] Figure 6 This is a schematic diagram of the folding knife mechanism from another angle in this invention.

[0031] Figure 7 This is a side view of the folding knife mechanism in this invention.

[0032] Figure 8 This is a schematic diagram of an application structure of the air blowing and material bending mechanism of the present invention.

[0033] Figure 9 This is a schematic diagram of another application structure of the air blowing and material folding mechanism of the present invention.

[0034] Figure 10 This is a schematic diagram of the structure of the sewing machine of the present invention.

[0035] Figure 11 This is a side view of the sewing machine of the present invention.

[0036] Figure 12 This is a partial structural schematic diagram of the sewing machine of the present invention.

[0037] Figure 13 This is a schematic diagram of a template component of the present invention.

[0038] Figure 14 This is a side view of the template component of the present invention.

[0039] Figure 15 This is a partial structural schematic diagram of the template component of the present invention.

[0040] Figure 16 This is a top view of the template component of the present invention.

[0041] Figure 17 This is a schematic diagram of one structure of the folding clamp in this invention.

[0042] Figure 18 This is a partial structural schematic diagram of the feed plate mechanism in this invention.

[0043] In the diagram: 1. Platform; 11. Stainless steel panel; 12. Bag opening machine pressing and fixing plate; 13. Stainless steel machine head back panel; 14. Lifting pallet platform inner panel; 2. Gantry seat; 3. Air blowing mechanism; 30. Upper air blowing mechanism; 31. Air blowing device; 310. Air passage; 311. Manifold; 3111. Connecting surface. 3112. Working surface; 312. Air outlet; 313. Air inlet; 314. Plug; 315. Air outlet pipe; 32. Air blowing height adjustment mechanism; 33. Slide table cylinder; 34. Adjustment base; 341. Gantry connecting seat; 342. Slide table connecting seat; 35. Base pad; 36. Adapter; 4. Template feeding mechanism; 5. Template assembly; 51. Large template assembly; 511. Large template; 5111. Long slot; 5112. Clamping plate lifting hole; 5113. Clamping plate lifting hole; 512. Outer frame support assembly; 513. Pressure frame guide rail plate; 514. Short feeder. 515. Reinforced Triangle Plate; 52. Folding Clamping Plate Assembly; 521. Folding Clamping Plate Flat Plate; 522. Folding Clamping Plate; 5221. Fixed Material Port; 5222. Toothed Groove; 523. Lifting Lever Baffle; 524. Lever Lifting Structure; 525. Connecting Positioning Hole; 53. Clamping Plate Lifting Mechanism; 531. Clamping Plate Lifting Cylinder Fixing Plate; 532. Clamping Plate Lifting Cylinder; 533. Clamping Plate Lifting Slide Rail; 534. Clamping Plate Lifting Slider; 535. Clamping Plate Guide Rail Connecting Bracket; 54. Fixed Material Plate Mechanism; 541. Fixed Material Plate Top Cover Plate; 542. Front Fixed Material Plate. 543. Rear fixing plate; 544. Fixing plate switch; 5441. Fixing plate cylinder; 5442. Fixing plate cylinder drive block; 5443. Fixing plate drive bracket; 545. Groove; 55. Folding clamp locking mechanism; 551. Folding front cylinder support frame; 552. Folding front cylinder; 553. Folding front cylinder connector; 554. Folding clamp lifting lever; 6. Folding knife mechanism; 60. Lower folding knife mechanism; 7. Folding knife assembly; 70. Lower folding knife assembly; 71. Folding knife; 72. Folding knife horizontal base plate; 73. Folding knife inclined side plate; 74. Folding knife insert teeth; 7 5. Flattening structure; 76. Adjustable mounting hole; 8. Folding width adjustment mechanism; 81. Folding knife mounting plate; 82. Adjusting base; 83. Adjusting slide rail; 84. Screw mounting slider; 85. Screw transmission bearing seat; 86. Screw drive servo motor; 87. Transmission screw; 9. Folding height adjustment mechanism; 91. Triangular rib plate; 92. Height adjustment seat; 93. Lifting guide rail; 94. Guide rail double slider; 95. Lifting transmission mechanism; 951. Screw lifting motor; 952. Lifting screw; 953. Screw bearing seat; 10. Material setting window; 100. Fabric. Detailed Implementation

[0044] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0045] Example 1: exist Figure 1 In the embodiment shown, an air-blowing folding mechanism includes a material positioning window 10 for positioning the fabric, as well as a large template assembly 51, a folding clamp assembly 52, a clamp lifting mechanism 53, a material positioning piece mechanism 54, and a folding clamp locking mechanism 55.

[0046] The material setting window 10 is provided with a relative and linked air blowing mechanism 3 and a folding knife mechanism 6 for folding materials. The air blowing mechanism 3 is provided with an air outlet 312 for realizing the first folding of materials, and the folding knife mechanism 6 is provided with an adjustable folding knife assembly 7 with folding knife insert teeth for realizing the second folding of materials.

[0047] like Figure 2 , Figure 3 As shown, the air blowing mechanism 3 includes an air blowing device 31 and an air blowing height adjustment mechanism 32. The air blowing height adjustment mechanism 32 adopts an automatic lifting adjustment device. In this embodiment, the automatic lifting adjustment device is a slide cylinder 33. The air blowing device 31 is mounted on the slide cylinder 33 and its lifting is controlled by the slide cylinder 33. In other embodiments, the automatic lifting adjustment device may include, but is not limited to, a motor screw device, or, but is not limited to, a synchronous belt and synchronous pulley mechanical transmission device. The specific device is not limited and can be configured according to actual needs.

[0048] like Figure 4 As shown, the air blowing device 31 includes a manifold 311 with an internal air passage 310. One end of the manifold 311 is provided with an air inlet 313 that connects to the air passage 310. The air outlet is provided on the manifold 311 and connects to the internal air passage 310.

[0049] In this embodiment, the air outlet 312 is a plurality of air outlet holes provided on the manifold. In other embodiments, the air outlet may also be one or more air outlet slots provided on the manifold; or, the air outlet may be a plurality of air outlet pipes provided on the manifold.

[0050] like Figure 5 , Figure 6 , Figure 7 As shown, the folding knife assembly 7 includes a pair of openable and closed folding knives 71. The ends of the folding knives 71 are provided with a plurality of folding knife inserts 74, and the folding knife inserts 74 are provided with a flattening structure 75.

[0051] The folding knife mechanism further includes a folding width adjustment mechanism 8 for controlling the opening and closing movement of the folding knife assembly 7 and a folding height adjustment mechanism 9 for controlling the lifting and lowering of the folding knife assembly. In this embodiment, the folding width adjustment mechanism 8 adopts a servo motor screw drive mechanism. In other embodiments, the folding width adjustment mechanism 8 can adopt a hydraulic parallel opening and closing mechanism. In this embodiment, the folding height adjustment mechanism 9 adopts a screw drive mechanism. In other embodiments, the folding height adjustment mechanism 9 can adopt a cylinder drive mechanism or a pulley drive mechanism. There are no specific limitations; the goal is to achieve precise and effective transmission.

[0052] The folding clamping plate assembly 52 includes an upper and lower stacked folding clamping plate 521 and a replaceable toothed folding clamping plate 522. The folding clamping plate assembly can clamp the folded pocket fabric after the second fold is completed.

[0053] The folding clamp 522 has a fixed material opening 5221 in the middle, and several toothed grooves 5222 are respectively provided on both sides of the fixed material opening 5221. The adjustable folding knife assembly with toothed grooves and the folding clamp with toothed grooves cooperate to form a tooth-meshing adjustable folding structure. Through the mutual meshing of the folding knife teeth and toothed grooves, The large template component 51 is provided with a large template 511, which is used to support the various components of the folding mechanism, realizing an integrated and compact design of the mechanism.

[0054] The material positioning mechanism 54 includes a material positioning switch 544, a front material positioning piece 542 and a rear material positioning piece 543 driven by the material positioning switch 544; when the front material positioning piece and the rear material positioning piece are in a combined state, they enclose to form the material positioning window 10.

[0055] The clamping plate lifting mechanism 53 adopts a cylinder-controlled sliding lifting structure or an electric cylinder-controlled sliding lifting structure; the folding clamp locking mechanism adopts a pneumatic connecting rod clamping structure.

[0056] Example 2: like Figure 8 , Figure 9 As shown, an air-blowing folding method includes the following steps: S1: The fabric 100 with the fabric stop is conveyed to the material setting window 10; S2: Under the control of the air blowing height adjustment mechanism 32, the air blowing mechanism 3 drives the air blowing device 31 to descend, blowing air towards the fabric stop through the air outlet 312 on the air blowing device 31, pressing the fabric stop towards the side of the fixed material window 10 facing the folding knife. The air performs the first folding of the fabric stop, so that the fabric stop is open at the fixed material window 10 and faces the other side of the fixed material window (see...). Figure 8 ); S3: The material folding clamping plate assembly 52 descends under the control of the clamping plate lifting mechanism 53; S4: The folding knife assembly 7 moves upward under the control of the folding height adjustment mechanism 9, so that the folding knife rises and passes through the fixed material opening 5221 on the folding clamp 522, and is inserted into the stop gap of the fabric. S5: Under the control of the air blowing height adjustment mechanism 32, the air blowing mechanism 3 rises and resets. The folding width adjustment mechanism 8 controls the folding blade 71 to open to both sides. The unfolding of the folding blade 71 drives the folding blade teeth to cover and flatten the fabric stop towards the lower plate of the front and rear fixed pieces, respectively. The second folding (see...) Figure 9 ); S6: The folding clamping plate assembly 52 rises and resets under the control of the clamping plate lifting mechanism 53, clamps the folded fabric stop, and locks and positions it through the folding clamp locking mechanism 55 to ensure that the fabric will not move, thus achieving a stable sewing operation; the folding knife assembly 7 resets under the control of the folding width adjustment mechanism 8 and the folding height adjustment mechanism 9 to complete the folding.

[0057] Example 3: exist Figure 10 , Figure 11 , Figure 12 In the illustrated embodiment, a sewing machine includes the aforementioned air-blowing and folding mechanism, and also includes a table 1 with a gantry seat 2 on the table 1. A stainless steel panel 11 is provided on the table, and a bag-opening machine pressing and fixing plate 12 and a stainless steel machine head backrest plate 13 are respectively provided on both sides of the stainless steel panel. A lifting tray inner plate 14 is also provided at the end of the stainless steel panel facing the bag-opening machine pressing and fixing plate 12.

[0058] In this embodiment, an upper air-blowing mechanism and a lower folding blade mechanism are used. In other embodiments, a lower air-blowing mechanism and an upper folding blade mechanism may also be used. Of course, the arrangement is not limited to the upper and lower structures and can be configured according to actual needs.

[0059] The gantry 2 is equipped with an air blowing mechanism 30 and a template feeding mechanism 4.

[0060] The template feeding mechanism 4 is located inside the gantry below the gantry seat.

[0061] A template assembly 5 is connected to the front end of the template feeding mechanism 4 via an integral template lifting mechanism. The template assembly 5 is suspended above the stainless steel panel 11.

[0062] A lower folding knife mechanism 60 is provided below the platform 1. The upper air blowing mechanism 30 is located above the template assembly 5. The template assembly 5 includes a large template and a folding clamping plate assembly. The lower folding knife mechanism 60 is located below the platform below the template assembly 5. The air blowing mechanism 30 and the lower folding knife mechanism 60 are arranged vertically correspondingly.

[0063] The template component 5 moves the cut bag fabric to below the upper air blowing mechanism 30 and then opens the folding clamping plate component.

[0064] The upper air blowing mechanism 30 is equipped with an air blowing device. When the air blowing device descends, it blows air onto the cut fabric. Under the downward airflow pressure, the stop is tightly attached to the fixed material sheet facing downward. The lower folding knife mechanism 60 rises from below the platform to between the folding clamping plate assembly and the large template. Then, the lower folding knife opens towards the folding clamping plate assembly, causing the fabric to wrap around the front and rear fixed material sheets. After the lower folding knife moves into the clamping plate groove, the clamping plate resets to clamp the fabric, thus completing the overall action.

[0065] The lower folding knife mechanism 60 includes a lower folding knife assembly 70, a folding width adjustment mechanism 8, and a folding height adjustment mechanism 9.

[0066] The lower folding blade assembly 70 is controlled to open and close by the folding width adjustment mechanism 8, so that the lower folding blade assembly 70 can open to a certain width as needed. The folding width adjustment mechanism 8 is set on the lower folding blade mounting plate 81, which is connected to the folding height adjustment mechanism 9 and is controlled to move up and down by the folding height adjustment mechanism 9, so that the lower folding blade assembly 70 can move up and down reciprocally.

[0067] The lower folding blade assembly 70 includes a pair of openable and closable lower folding blades 71, which are arranged in a figure-eight shape. Each lower folding blade 71 includes an integrally formed horizontal base plate 72, a folding blade inclined side plate 73 connected to the horizontal base plate 72 at a certain angle, and a plurality of folding blade inserts 74 vertically arranged on the upper end of the inclined side plate 73. The ends of the folding blade inserts 74 are provided with flattening structures 75. A plurality of adjustable mounting holes 76 are provided on the horizontal base plate 72.

[0068] The aforementioned folding width adjustment mechanism 8 uses a servo motor screw drive mechanism to drive the opening and closing type lower folding blade to open a certain width. In other embodiments, the folding width adjustment mechanism can also use a hydraulic parallel opening and closing mechanism, such as a hydraulic parallel opening and closing gripper. Other adjustment mechanisms can also be used, as long as they can drive the lower folding blade to perform opening and closing movements; the specific structure is not limited.

[0069] In this embodiment, the folding width adjustment mechanism 8 includes an adjustment base 82 with an overall U-shaped structure, an adjustment slide rail 83 disposed on the adjustment base 82, a lead screw mounting slider 84 slidably disposed on the adjustment slide rail 83, lead screw drive bearing seats 85 disposed at the front and rear ends of the adjustment base 82, a lead screw drive servo motor 86, and a transmission lead screw 87 connected to the lead screw drive servo motor 86 via a coupling. The transmission lead screw 87 is rotatably disposed on the lead screw drive bearing seat 85. The transmission lead screw 87 is drively connected to the lead screw mounting slider 84 and drives the lead screw mounting slider 84 to perform reciprocating linear motion along the adjustment slide rail 83, thereby driving the lower folding knife assembly 70 on it to open or close.

[0070] The folding height adjustment mechanism 9 includes a pair of triangular ribs 91 connected to the lower folding blade mounting plate 81, a height adjustment seat 92, a lifting guide rail 93 mounted on the height adjustment seat 92, and a double slider 94 slidably mounted on the lifting guide rail 93. The triangular ribs 91 are connected to the double slider 94 and are driven by the double slider 94 to slide up and down along the lifting guide rail 93. A lifting transmission mechanism 95 drives the triangular ribs 91 to move up and down along the lifting guide rail 93. The lifting transmission mechanism 95 can be a screw drive mechanism or a cylinder drive mechanism, etc., to achieve the transmission.

[0071] In this embodiment, the lifting transmission mechanism 95 adopts a lifting screw transmission mechanism. The lifting screw transmission mechanism 95 includes a screw lifting motor 951, a lifting screw 952 connected to the screw lifting motor 951 via a coupling, and the lifting screw 952 is rotatably connected to the height adjustment seat 92 via a set of screw bearing seats 953. The lifting screw 952 is threadedly connected to the triangular rib plate 91 and drives the triangular rib plate 91 to move up and down along the lifting guide rail 93, thereby driving the lower folding knife mounting plate 81, the lower folding knife assembly 70 and the folding width adjustment mechanism 8 mounted on the lower folding knife mounting plate 81 to rise and fall together.

[0072] The upper air blowing mechanism 30 includes an air blowing device 31 and an air blowing height adjustment mechanism 32. The air blowing device 31 is connected to one end of the air blowing height adjustment mechanism 32, wherein the air blowing height adjustment mechanism 32 can adjust the height between the air blowing device 31 and the fabric, and can effectively adjust the overall one-time folding effect. The other end of the air blowing height adjustment mechanism 32 is connected to the gantry 2.

[0073] The air blowing device 31 includes a manifold 311 with an internal air passage 310 and a plurality of air outlets 312 disposed on the manifold 311.

[0074] In this embodiment, the manifold 311 has an air inlet 313 and a plug 314 at both ends. The manifold 311 has an internal air passage 310, which is connected to several air outlets 312. Each air outlet 312 is connected to an air outlet pipe 315. During operation, the air outlet pipe 315 is positioned above the fabric. When air is supplied, gas passes through the air inlet 313 and the air passage 310 and exits through the air outlet pipe 315 at the air outlet 312, thereby applying pressure to the cut fabric. In other embodiments, air outlets can be directly provided on the manifold 311 without an air outlet pipe.

[0075] The manifold 311 includes a connecting surface 3111 and a working surface 3112. The connecting surface 3111 is connected to the air blowing height adjustment mechanism 32. The air outlets 312 are evenly distributed in two rows on the working surface 3112. The working surface 3112 is oriented downwards towards the folding blade. In this embodiment, the air outlets 312 are distributed in two rows on the working surface of the manifold.

[0076] The air blowing height adjustment mechanism 32 adopts an automatic lifting adjustment device, which includes a height adjustment base 34 and a slide cylinder 33.

[0077] The height-adjustable base 34 has a gantry connecting seat 341 and a slide connecting seat 342 at its two ends, and a base pad 35 is also connected to the gantry connecting seat. The slide cylinder is connected to the slide connecting seat.

[0078] The slide cylinder 33 includes a slide cylinder body 331 and a slide cylinder rod 332. The slide cylinder 332 combines the cylinder and the slide mechanism. Compressed air enters the slide cylinder body and pushes the internal piston to drive the slide cylinder rod to reciprocate on the slide, thereby realizing the up and down movement of the air blowing device.

[0079] The air blowing device 31 is connected to the slide cylinder 33 via an L-shaped adapter 36.

[0080] like Figure 13 , Figure 14 As shown, the template component 5 includes a large template component 51, a folding clamping plate component 52 disposed below the large template component 51, and a clamping plate lifting mechanism 53, a fixed material piece mechanism 54, and a folding clamping plate locking mechanism 55 integrated on the large template component 51.

[0081] The large template assembly 51 includes a large template 511, an outer frame support assembly 512 disposed at the rear end of the large template 511, a pressure frame guide plate 513 connected to the outer frame support assembly, and short reinforcing triangular plates 514 and long reinforcing triangular plates 515 disposed on the pressure frame guide plate 513 and connected to both sides of the large template 511.

[0082] A long slot 5111 is formed in the middle of the large template 511. Two clamping plate lifting holes 5112 are formed at the rear end of the large template 511 near the outer frame support assembly 512, and the clamping plate lifting holes 5112 are set corresponding to the clamping plate lifting mechanism 53.

[0083] A pair of clamp lifting holes 5113 are provided at the front end of the large template 511, and the clamp lifting holes 5113 are provided corresponding to the folding clamp locking mechanism 55.

[0084] like Figure 17 , Figure 18 As shown, the folding clamping plate assembly 52 includes a folding clamping plate 521 stacked on top of each other and a toothed folding clamping plate 522. The folding clamping plate 522 has a fixed material opening 5221 in the middle. Several toothed grooves 5222 are respectively provided on both sides of the fixed material opening 5221. The toothed grooves 5222 correspond to and cooperate with the folding knife teeth 74 on the lower folding knife 71.

[0085] Two lifting lever baffles 523 are provided at the front end of the folding clamp plate 521, and a lever lifting structure 524 is provided at the rear end of the folding clamp plate 521. The lever lifting structure consists of two extension rods, and the extension rods are provided with multiple connection positioning holes 525 for connecting with the clamp guide rail connecting bracket.

[0086] like Figure 15 As shown, the clamping plate lifting mechanism 53 is provided in two sets. Each set of the clamping plate lifting mechanism 53 includes a clamping plate lifting cylinder fixing plate 531, a clamping plate lifting cylinder 532 disposed on the clamping plate lifting cylinder fixing plate 531, a clamping plate lifting slide rail 533 and a clamping plate lifting slider 534 disposed on the clamping plate lifting cylinder fixing plate 531, and a clamping plate guide rail connecting bracket 535 disposed on the clamping plate lifting slider 534 and driven to rise and fall by the clamping plate lifting cylinder. The upper end of the clamping plate guide rail connecting bracket 535 is connected to the piston rod of the clamping plate lifting cylinder, and the lower end of the clamping plate guide rail connecting bracket 535 passes through the clamping plate lifting hole 5112 on the large template and connects to the rear end of the folding clamping plate assembly 52. ​​The folding clamping plate assembly 52 is controlled to rise and fall by the clamping plate lifting mechanism 53.

[0087] The material-fixing plate mechanism 54 includes a material-fixing plate top cover plate 541, a pair of front material-fixing plates 542 and a rear material-fixing plate 543 arranged symmetrically front and rear, and a material-fixing plate switch 544 for driving the front material-fixing plates 542 and the rear material-fixing plates 543 to open and close. The material-fixing plate top cover plate 541 is embedded inside the long groove 5111 of the large template, and the front material-fixing plates 542 and the rear material-fixing plates 543 are located below the material-fixing plate top cover plate 541 and are driven to open and close by the material-fixing plate switch 544.

[0088] like Figure 14 As shown, four sets of the positioning plate switches 544 are symmetrically arranged, with two sets at the front end and two sets at the rear end of the large template. The two sets of front positioning plate switches drive the front positioning plate to move, and the two sets of rear positioning plate switches drive the rear positioning plate to move. Grooves 545 for forming the positioning window 10 are provided on both the front and rear positioning plates.

[0089] Each set of fixed sheet switches 544 includes a fixed sheet cylinder 5441 horizontally arranged on the large template plate, a fixed sheet cylinder drive block 5442 connected to the piston rod of the fixed sheet cylinder, and a fixed sheet drive bracket 5443 connected to the fixed sheet cylinder drive block 5442 for connecting the front and rear fixed sheet pieces.

[0090] The four sets of fixed material plate switches 544 can be linked to drive the front and rear fixed material plates to open and close. When the front and rear fixed material plates are in a combined state, a certain material window 10 is formed between the front and rear fixed material plates.

[0091] The folding clamp locking mechanism 55 includes a folding front cylinder support frame 551, a folding front cylinder 552 connected to the folding front cylinder support frame 551 and horizontally arranged on the front end plate of the large template, a folding front cylinder connector 553 connected to the piston rod of the folding front cylinder, and a folding clamp lifting lever 554 hinged to the folding front cylinder connector 553. The folding clamp lifting lever 553 extends through the clamp lifting hole 5113 on the large template to the front end of the folding clamp assembly 52, clamping the lifting lever baffle 523 to achieve clamping and positioning of the folding clamp assembly 52, making the clamping of the folding clamp assembly more stable.

[0092] like Figure 5 , 6 As shown in Figure 7, the template assembly 5 includes a folding clamping plate assembly 52. ​​A clamping plate lifting mechanism 53 is connected to the rear end of the folding clamping plate assembly 53, which can control the rising and falling of the folding clamping plate assembly 52. ​​The template assembly 5 also includes a material fixing plate switch 554, which connects the front material fixing plate and the rear material fixing plate. The switch can control the front and rear material fixing plates to separate or merge. When the front and rear material fixing plates are merged, the grooves on the front and rear material fixing plates close to form a material fixing window 10. The folding clamping plate 522 has a material fixing opening 5221, and tooth grooves 5222 on both sides of the material fixing opening that mesh with the folding knife teeth. The folding width adjustment mechanism 8 controls the opening width of the lower folding knife, thereby controlling the engagement depth of the folding knife teeth with the tooth grooves to meet the needs of folding materials for different pocket widths without requiring a change in the folding knife size.

[0093] The sewing machine uses the air-blowing folding mechanism to fold materials in the following steps: Step 1: The template feeding mechanism 4 conveys the fabric with the fabric stop to the large template, so that the fabric stop is on the fixed window 10. Step 2: The upper air blowing mechanism 30 descends, and the air blowing device 31 begins to blow air downwards. The gas with a certain pressure blown out from the air outlet 312 blows the fabric stop towards the lower part of the fixed material window 10, so that the fabric stop is blown into a downward state. Step 3: The folding clamping plate assembly 52 below the large template assembly 51 is lowered a certain height away from the large template assembly under the control of the clamping plate lifting mechanism 53; Step 4: The lower folding knife assembly 70 moves upward under the control of the folding height adjustment mechanism 9, so that the lower folding knife 71 rises and passes through the fixed material opening 5221 on the folding clamp 522, and is inserted into the stop gap of the fabric. Step 5: The upper air blowing mechanism 30 rises and resets, the folding width adjustment mechanism 8 is activated, and the lower folding blade 71 is controlled to open to both sides. The unfolding of the lower folding blade 71 covers and flattens the fabric stop towards the lower plate of the front and rear fixed pieces respectively. Step 6: The folding clamp assembly 52 is reset, and then the lower folding knife assembly 70 is reset, completing one folding operation.

[0094] In the above embodiments, the bag-opening and folding mechanism performs the folding action by blowing air, effectively avoiding the need to change the folding blade when changing sizes. The air-blowing action is more efficient than existing folding blades, effectively reducing the overall process time; the overall structure has good coordination of operation, high efficiency, good stability, and high control precision.

[0095] This sewing machine uses an upper air blowing mechanism and a lower folding blade to fold the fabric, and finally uses a clamping plate to complete the bag folding function. First, the upper air blowing mechanism presses the cut fabric edge downward above the material setting window, so that the fabric edge is against the material setting window facing downward. The lower folding blade rises and flattens the fabric edge to both sides to complete the second folding, thus completing the folding action. This structure does not require the traditional upper folding blade to pass through the material setting window for folding, thus enabling folding of different pocket widths without changing the folding blade size.

Claims

1. A blowing and folding mechanism comprising a fabric positioning window (10) for achieving fabric positioning, characterized in that: The folding window (10) is provided with a relative and linked blowing mechanism (3) and a folding knife mechanism (6), the blowing mechanism (3) is provided with an air outlet (312) for realizing the first folding, and the folding knife mechanism (6) is provided with a gear adjusting folding knife assembly (7) for realizing the second folding.

2. The air-fold mechanism according to claim 1, characterized in that: The blowing mechanism (3) comprises a blowing device (31) and a blowing height adjusting mechanism (32), the blowing height adjusting mechanism (32) adopts an automatic lifting adjusting device, and the blowing device (31) is arranged on the automatic lifting adjusting device and controlled to lift and descend by the automatic lifting adjusting device.

3. The air-fold mechanism according to claim 2, wherein: The blowing device (31) comprises a converging piece (311) with an air path (310) in the interior, one end of the converging piece (311) is provided with an air inlet (313) communicated with the air path (310), and the air outlet (312) is arranged on the converging piece (311) and communicated with the air path (310) in the interior; the air outlet (312) is provided with a plurality of air outlet holes on the converging piece; or the air outlet (312) is provided with one or more air outlet grooves on the converging piece; or the air outlet (312) is provided with a plurality of air outlet tubes (315) on the converging piece.

4. The air folding mechanism according to any one of claims 1 to 3, characterized in that: The folding knife assembly (7) comprises a pair of open-close folding knives (71), the end of the folding knife (71) is provided with a plurality of folding knife gears (74), and the folding knife gears (74) are provided with flattening structures (75).

5. The air folding mechanism according to any one of claims 1 to 3, wherein: The folding knife mechanism (6) further comprises a folding width adjusting mechanism (8) for controlling the open-close movement of the folding knife assembly (7) and a folding height adjusting mechanism (9) for controlling the lifting of the folding knife assembly (7); the folding width adjusting mechanism (8) adopts a servo motor and a lead screw transmission mechanism; or the folding width adjusting mechanism (8) adopts a hydraulic parallel open-close mechanism; the folding height adjusting mechanism (9) adopts a lead screw transmission mechanism, or a cylinder transmission mechanism, or a wheel transmission mechanism.

6. The air folding mechanism according to any one of claims 1 to 3, wherein: The blowing and folding mechanism further comprises a large template assembly (51), a folding clamp plate assembly (52), a clamp plate lifting mechanism (53), a material setting mechanism (54) and a folding clamp plate locking mechanism (55).

7. The air-fold mechanism according to claim 6, characterized in that: The folding clamp plate assembly (52) comprises a folding clamp plate flattening plate (521) and a replaceable folding clamp plate (522) with gears stacked up and down, the middle part of the folding clamp plate (522) is provided with a material setting port (5221), and the two side edges of the material setting port (5221) are respectively provided with a plurality of gear insertion grooves (5222); the gear adjusting folding knife assembly (7) and the folding clamp plate (522) with gear insertion grooves are matched to form a gear engagement type adjusting folding structure.

8. The air-fold mechanism according to claim 6, wherein: The large template assembly (51) is provided with a large template (511); the material piece setting mechanism (54) comprises a material piece setting switch (544), a front material piece setting plate (542) and a rear material piece setting plate (543) driven by the material piece setting switch (544); the front material piece setting plate (542) and the rear material piece setting plate (543) form the material piece setting window (10) when they are in a combined state; the clamping plate lifting mechanism (53) adopts a cylinder control sliding lifting structure or an electric cylinder control sliding lifting structure; and the material piece folding clamp locking mechanism (55) adopts a pneumatic connecting rod clamping structure.

9. A gas-assisted folding method, characterized by: It adopts the blowing and folding mechanism of any one of claims 1-8, comprising the following steps: S1: delivering the fabric with a fabric stopper to the material piece setting window; S2: lowering the blowing mechanism, blowing the fabric stopper towards the side of the folding knife of the material piece setting window by the blowing device, and folding the fabric for the first time; S3: lowering the folding clamp assembly; S4: moving the folding knife assembly upwards, so that the folding knife goes up and passes through the material piece setting window and is inserted into the gap between the fabric stoppers; S5: raising the blowing mechanism to reset, and controlling the folding knife to open to both sides by the action of the folding width adjusting mechanism, so that the fabric stopper is covered and pressed flat towards the lower surface of the front material piece setting plate and the rear material piece setting plate by the unfolding of the folding knife, and the fabric is folded for the second time; S6: resetting the folding clamp assembly and the folding knife assembly, and completing the folding.

10. A sewing machine characterized by: The blowing and folding mechanism of any one of claims 1-8.

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