Bag opening and folding mechanism, folding method and sewing machine

Abstract

The bag opening and material folding mechanism comprises a material fixing window used for achieving fabric positioning, an upper slotting tool mechanism and a lower folding tool mechanism are oppositely arranged on the upper side and the lower side of the material fixing window, the upper slotting tool mechanism and the lower folding tool mechanism are used for conducting direct-drive up-and-down linkage material folding, and an upper slot is formed in the upper slotting tool mechanism; the lower folding knife mechanism is internally provided with lower inserting teeth which are meshed with the upper inserting grooves to fold materials, and a material folding clamping plate assembly with a tooth inserting groove is arranged below the material fixing window. The upper slotting tool and the lower folding tool are used for carrying out direct-drive up-and-down linkage folding, the folding clamping plate assembly is used for completing the bag cloth folding function, gear shaping and staggered pressing are carried out, the clamping area of the folding clamping plate assembly for front and rear seam allowances of the bag cloth is increased, the problem that the seam allowances of the bag cloth deviate in the working process is effectively solved, the lower folding tool is directly driven up and down, the efficiency is higher, and the cost is lower; the folding requirements of fabrics with different sizes can be met, the limitation of the length and width of the notch is avoided, and the universality is good.

Description

Technical Field

[0001] This invention relates to the field of sewing machine technology, and more particularly to a pocket-opening and folding mechanism, a 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] Currently, for example, Chinese utility model patent with authorization announcement number CN212955653U discloses a bag opening machine for processing garment bag openings. The machine has a bag folding mechanism, a material fixing mechanism, and a shaping mechanism above its worktable. The material fixing mechanism clamps the garment 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 folded bag opening.

[0004] Traditional fabric folding inserts consist of four sets of folding blades forming a rectangular outline with the blades facing outwards. The folding blades complete the folding process by moving outwards. When the folding mechanism passes through the slot from top to bottom to fold the fabric, the distance the lateral moving component can travel outwards is limited by the length and width of the slot, affecting the stability of the folding. Furthermore, the sidewall of the material setting window of the material setting mechanism only serves a positioning and guiding function and cannot effectively shape the folded fabric. Relying on a negative pressure device to shape the folded fabric makes it easy for the fabric to spring back when the fabric folding insert is reset, which reduces the product's pass rate. This springback phenomenon is even more pronounced with some highly elastic or thick fabrics, affecting the quality of subsequent sewing and other processing steps. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of existing rectangular outlines formed by four sets of folding blades with the blades facing outwards, which are limited by the length and width of the slot, making it impossible to achieve a universal design, resulting in low folding stability, inability to shape the folded fabric, and pocket fabric edge misalignment during operation. This invention provides a pocket opening and folding mechanism, folding method, and sewing machine that can meet the folding needs of fabrics of different sizes, is not limited by the length and width of the slot, has good versatility, adopts direct drive upper and lower linkage meshing, has high efficiency, can effectively increase the clamping area of ​​the clamping plates on the front and back of the fabric, reduce the problem of pocket fabric edge misalignment, and has low cost.

[0006] The technical solution adopted by the present invention to achieve its purpose is: a bag opening and folding mechanism, including a material positioning window for positioning the fabric, an upper inserting knife mechanism and a lower folding knife mechanism for direct drive and linkage folding are arranged opposite each other on the upper and lower sides of the material positioning window, the upper inserting knife mechanism is provided with an upper slot, the lower folding knife mechanism is provided with a lower inserting tooth that engages with the upper slot for folding, and a folding clamping plate assembly with inserting tooth groove is provided below the material positioning window. This bag-opening and folding mechanism utilizes an upper inserting knife mechanism with an upper slot and a lower folding knife mechanism with lower inserting teeth for direct-drive, vertically linked engagement and folding. This allows it to meet the folding needs of fabrics of different sizes, is not limited by the length and width of the slot, and offers good folding stability. Furthermore, the depth of engagement between the lower inserting teeth and the upper slot can be controlled to accommodate fabrics of varying thicknesses, providing good versatility. The lower folding knife mechanism is equipped with a folding clamping plate assembly with inserting tooth grooves. During folding, the lower inserting teeth and inserting tooth grooves engage and interlock to press the material, which is then clamped and positioned by the folding clamping plate assembly. This interlocking pressing increases the clamping area of ​​the folding clamping plate assembly on the front and rear edges of the bag fabric, effectively shaping the folded fabric and preventing displacement of the bag fabric edges during operation. In addition, the direct-drive vertical movement of the lower folding knife mechanism is more efficient and cost-effective than the traditional folding knife mechanism's retraction action after the clamping plate completes its work.

[0007] Preferably, the upper inserting knife mechanism includes an upper inserting knife and an inserting knife height adjustment mechanism. The upper inserting knife is connected to the inserting knife height adjustment mechanism and its lifting and lowering are controlled by the inserting knife height adjustment mechanism. The upper inserting knife achieves lifting and lowering control through the inserting knife height adjustment mechanism, resulting in good stability and high efficiency.

[0008] Preferably, the upper insert blade includes an insert blade plate and a plurality of upper insert teeth disposed on the insert blade plate, the upper insert teeth forming upper slots with each other; the insert blade plate is detachably connected to the insert blade height adjustment mechanism via an insert blade mounting plate; the insert blade height adjustment mechanism employs an automatic lifting adjustment device. The upper insert blade is provided with a plurality of upper insert teeth for engaging with the lower insert teeth to fold the material. Because a gap is formed between the engaging teeth, gap folding of the fabric can be performed, achieving stable folding and preventing uneven folding.

[0009] Preferably, the lower folding blade mechanism includes a lower folding blade assembly, a folding width adjustment mechanism for controlling the opening and closing movement of the lower folding blade assembly, and a folding height adjustment mechanism for controlling the lifting and lowering of the folding blade assembly. The lower folding blade 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. This makes the operation convenient, efficient, and precise. Simultaneously, to enable the lifting and lowering of the lower folding blade mechanism, a folding height adjustment mechanism is provided to control the overall lifting and lowering of the lower folding blade mechanism, achieving operations such as folding reset.

[0010] Preferably, the lower folding blade assembly includes a pair of opening and closing lower folding blades, with lower insert teeth evenly distributed at the ends of the blades, and each insert tooth having a flattening structure. The lower folding blade mechanism, with its pair of opening and closing blades, can accommodate folding of different material areas by controlling the opening width of the blades, offering good applicability and versatility. Simultaneously, it enables smooth folding of fabric, using several lower insert teeth for intermittent folding, while the flattening structure on the insert teeth ensures smoother and more efficient folding.

[0011] 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.

[0012] 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.

[0013] Preferably, the folding clamp assembly is positioned below a large template. The folding clamp assembly includes a flat folding clamp plate stacked vertically and toothed folding clamps. A material-fixing opening is provided in the center of each folding clamp, and toothed grooves are evenly distributed on both sides of the opening. The folding clamp assembly mainly includes a flat folding clamp plate and folding clamps that can be replaced according to different sizes and thicknesses. A material-fixing opening is provided on each folding clamp, and several toothed grooves are provided on both sides of the opening. These toothed grooves cooperate with the toothed blades on the folding blade. The staggered pressing of the lower toothed blades and the toothed grooves improves the clamping of the fabric at the front and rear edges of the bag fabric, ensuring stable and neat folding, meeting the needs of folding different pocket widths, and preventing the bag fabric edges from shifting during operation.

[0014] Preferably, the large template integrates a clamping plate lifting mechanism, a material fixing plate mechanism, and a folding clamping plate lifting mechanism. 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 a material fixing window. By controlling the front and rear material fixing plates with the material fixing plate switch to enclose and form material fixing windows of different sizes, it has a wide range of applications and good versatility.

[0015] The technical solution adopted by the present invention to achieve its second objective is: a method for opening and folding bags, which employs the opening and folding mechanism described above, and includes the following steps: S1: Convey the fabric with the fabric stop to the setting window; S2: The upper blade descends, and the upper blade folds the cut fabric towards the bottom of the material setting window for the first time; S3: The material clamping plate assembly descends and opens; S4: The lower folding knife assembly rises to a specified height according to the thickness of the fabric and engages with the upper slot of the upper insert knife; S5: The lower folding blade opens to both sides, and the unfolding of the folding blade drives the lower insert teeth to flatten the fabric edge to both sides, and the fabric is folded for the second time; the upper insert blade returns to its original position. S6: The folding clamping plate assembly rises and resets, clamping the folded fabric stop and locking it in place through the folding clamping plate locking mechanism; the lower folding knife assembly resets downwards.

[0016] This bag-opening and folding method mainly uses the upper insert blade and the lower folding blade to fold the material in conjunction. Finally, the folding clamping plate assembly completes the bag folding function. The interlocking pressing of the insert teeth of the lower folding blade and the insert teeth of the folding clamping plate assembly increases the clamping area of ​​the folding clamping plate assembly for the front and rear stops of the bag fabric, effectively preventing the bag fabric stops from shifting during the working process. Compared with the traditional folding blade, which retracts after the clamping plate has completed its work, the direct drive of the lower folding blade is more efficient and lower in cost. It also avoids the problem of the bag fabric stops shifting due to the retraction of the lower folding blade.

[0017] The technical solution adopted by the present invention to achieve its third inventive objective is: a sewing machine, including the aforementioned bag opening and folding mechanism.

[0018] The beneficial effects of this invention are as follows: This bag-opening and folding mechanism uses an upper insert blade and a lower folding blade to fold the material in linkage, and finally completes the bag folding function through a folding clamping plate assembly. The interlocking pressing of the insert teeth of the lower folding blade and the insert teeth of the folding clamping plate assembly increases the clamping area of ​​the folding clamping plate assembly on the front and rear edges of the bag fold, effectively preventing the bag fold edge from shifting during operation. Compared with traditional folding blades that retract after the clamping plate has finished its work, the direct-drive up-and-down movement of the lower folding blade is more efficient and lower in cost, while also avoiding the problem of bag fold edge shifting caused by the lower folding blade retraction. It can meet the folding needs of fabrics of different sizes, is not limited by the length and width of the slot, has good versatility, and uses direct-drive up-and-down linkage meshing, resulting in high efficiency and effectively increasing the clamping area of ​​the clamping plate on the front and rear of the fabric, reducing the problem of bag fold edge shifting. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one structure of the bag opening and folding mechanism of the present invention.

[0020] Figure 2 This is a schematic diagram of one structure of the upper inserting knife mechanism in this invention.

[0021] Figure 3 This is a schematic diagram of the upper inserting mechanism from another angle in this invention.

[0022] Figure 4 This is a schematic diagram of one structure of the upper insert blade in this invention.

[0023] Figure 5 This is a schematic diagram of one structure of the lower folding blade mechanism in this invention.

[0024] Figure 6 This is a schematic diagram of the lower folding blade mechanism from another angle in this invention.

[0025] Figure 7 This is a side view of the lower folding knife mechanism in this invention.

[0026] Figure 8 This is a schematic diagram of an application structure of the bag opening and folding mechanism of the present invention.

[0027] Figure 9 This is a schematic diagram of another application structure of the bag opening and folding mechanism of the present invention.

[0028] Figure 10 This is a schematic diagram of the structure of the sewing machine of the present invention.

[0029] Figure 11 This is a side view of the sewing machine of the present invention.

[0030] Figure 12 This is a partial structural schematic diagram of the sewing machine of the present invention.

[0031] Figure 13 This is a schematic diagram of a template component of the present invention.

[0032] Figure 14 This is a side view of the template component of the present invention.

[0033] Figure 15 This is a partial structural schematic diagram of the template component of the present invention.

[0034] Figure 16 This is a top view of the template component of the present invention.

[0035] Figure 17 This is a schematic diagram of one structure of the folding clamp in this invention.

[0036] Figure 18 This is a partial structural schematic diagram of the feed plate mechanism in this invention.

[0037] 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 plate; 2. Gantry; 3. Upper inserting knife mechanism; 31. Upper inserting knife. 311. Inserting blade plate; 312. Upper inserting tooth; 313. Connecting slot; 314. Upper slot; 32. Inserting blade height adjustment mechanism; 33. Slide cylinder; 34. Height adjustment base; 341. Gantry connecting seat; 342. Slide connecting seat; 35. Inserting blade mounting seat; 36. Inserting blade mounting plate; 37. Slide cylinder mounting plate; 4. Template feeding mechanism; 5. Template assembly; 51. Large template assembly; 511. Large template; 5111. Long slot; 5112. Clamping plate lifting hole; 5113. Clamping piece lifting hole; 512. Outer frame support assembly; 513. Pressure frame guide rail plate; 514. Short reinforcing triangle plate; 515. Long reinforcing triangle plate; 52. Folding clamping plate assembly; 521. Folding clamping piece flat plate; 522. Folding clamping piece; 5221. Fixed material port; 522 2. 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 fixed material plate; 544. Fixed material plate switch; 5441. Fixed material plate cylinder; 5442. Fixed material plate cylinder drive block; 5443. Fixed material plate drive bracket; 545. Groove; 55. Folding clamping plate locking mechanism; 551. Folding front cylinder support frame; 552. Folding front cylinder; 553. Folding front cylinder connector; 554. Folding clamping plate lifting lever; 6. Lower folding knife mechanism; 7. Lower folding knife assembly; 71. Lower folding knife; 72. Folding knife horizontal base plate; 73. Folding knife inclined side plate; 74. Lower insert tooth; 75. 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 drive bearing seat; 86. Screw drive servo motor; 87. Drive 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

[0038] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0039] Example 1: exist Figure 1In the embodiment shown, a bag opening and 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.

[0040] On the upper and lower sides of the material setting window 10, there are an upper inserting knife mechanism 3 and a lower folding knife mechanism 6 that are directly driven and linked to fold material. The upper inserting knife mechanism 3 is provided with an upper slot 314, and the lower folding knife mechanism 6 is provided with a lower inserting tooth 74 that engages with the upper slot 314 to fold material. A folding clamping plate assembly 52 with inserting tooth groove 5222 is provided below the material setting window.

[0041] like Figure 2 , Figure 3 As shown, the upper inserting knife mechanism 3 includes an upper inserting knife 31 and an inserting knife height adjustment mechanism 32. The upper inserting knife 31 is connected to one end of the inserting knife height adjustment mechanism 32, wherein the inserting knife height adjustment mechanism 32 can control the inserting knife to perform reciprocating linear motion. The inserting knife height adjustment mechanism 32 is fixedly connected to the gantry seat through the inserting knife mounting seat. The upper inserting knife 31 is provided with an upper slot 314 that meshes with the lower inserting tooth 74.

[0042] The blade height adjustment mechanism 32 employs an automatic lifting adjustment device. In this embodiment, the automatic lifting adjustment device includes a slide cylinder 33, and the upper blade 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.

[0043] like Figure 5 , Figure 6 , Figure 7 As shown, the lower folding blade assembly 7 includes a pair of openable and closable lower folding blades 71. The ends of the lower folding blades 71 are provided with a plurality of lower insert teeth 74, and the lower insert teeth 74 are provided with a flattening structure 75.

[0044] The lower folding blade mechanism 6 further includes a folding width adjustment mechanism 8 for controlling the opening and closing movement of the lower folding blade assembly 7 and a folding height adjustment mechanism 9 for controlling the lifting and lowering of the lower folding blade 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.

[0045] 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.

[0046] The material clamping piece 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 lower teeth and the toothed grooves 5222 mesh with each other to achieve staggered material pressing, which effectively increases the clamping area of ​​the front and rear stops of the bag fabric and can prevent the bag fabric stops from shifting.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] Example 2: like Figure 8 , Figure 9 As shown, a method for opening and folding bags 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 insertion height adjustment mechanism 32, the upper insertion knife mechanism 3 drives the upper insertion knife 31 to descend. The upper insertion knife folds the cut fabric edge towards the lower part of the material setting window 10, performing the first fold; so that the fabric edge is open at the material setting window 10 and faces the lower insertion knife side (see...). Figure 8 ); S3: The material folding clamping plate assembly 52 descends and opens under the control of the clamping plate lifting mechanism 53; S4: The lower folding knife assembly 7 moves upward to a specified height according to the thickness of the fabric through the folding height adjustment mechanism 9, and engages with the upper slot of the upper insert knife; S5: The folding width adjustment mechanism 8 controls the lower folding blade 71 to open to both sides. The unfolding of the lower folding blade 71 drives the lower insert teeth to flatten the fabric by aligning the fabric's stop edge towards the lower surfaces of the front and rear fixed pieces, respectively. The second folding (see...) Figure 9 Then, the upper inserting mechanism 3 rises and resets under the control of the inserting height adjustment mechanism 32; 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 lower 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.

[0051] Example 3: exist Figure 10 , Figure 11 , Figure 12 In the illustrated embodiment, a sewing machine includes the aforementioned bag-opening 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.

[0052] The gantry base 2 is equipped with a template feeding mechanism 4. The template feeding mechanism 4 is located inside the gantry below the gantry base.

[0053] 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.

[0054] A lower folding knife mechanism 6 is provided below the platform 1. The upper inserting knife mechanism 3 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 6 is located below the platform below the template assembly 5. The upper inserting knife mechanism 3 and the lower folding knife mechanism 6 are arranged vertically correspondingly.

[0055] The template component 5 moves the cut bag fabric to below the upper inserting knife mechanism 3 and then opens the folding clamping plate component.

[0056] The template assembly 5 is equipped with a folding clamping plate assembly and a lower folding knife mechanism 6 below it. After the template assembly moves the cut bag fabric to below the upper inserting knife mechanism 3, it opens the folding clamping plate assembly (see...). Figure 14 (With the clamping plate open), the upper inserting knife mechanism 3 is equipped with an upper inserting knife 31 with a slot. The upper inserting knife 31 descends to open the cut bag fabric stop downwards, and the lower folding knife mechanism 6 rises from below the platform to between the folding clamping plate assembly and the large template, while simultaneously embedding itself into the slot of the upper inserting knife (see...). Figure 11 After completion, the lower folding blade is opened to both sides (see 7 Lower folding blade open state), which moves the fabric to cover the front and rear fixed material plates. After the lower folding blade moves into the fixed material opening 5221 of the clamping plate of the folding clamping plate 522, the folding clamping plate assembly 52 resets to clamp the fabric, thus completing the overall action.

[0057] See Figure 2 , Figure 3 , Figure 4 As shown, the upper inserting knife mechanism 3 includes an upper inserting knife 31 and an inserting knife height adjustment mechanism 32. The upper inserting knife 31 is connected to one end of the inserting knife height adjustment mechanism 32, wherein the inserting knife height adjustment mechanism 32 can control the inserting knife to perform reciprocating linear motion. The inserting knife height adjustment mechanism 32 is fixedly connected to the gantry seat through the inserting knife mounting seat 35. The upper inserting knife 31 is provided with an upper slot 314 that meshes with the lower inserting tooth 74.

[0058] The blade height adjustment mechanism 32 adopts an automatic lifting adjustment device. In this embodiment, the automatic lifting adjustment device includes a height adjustment base 34 and a slide cylinder 33.

[0059] The height adjustment base 34 has a gantry connecting seat 341 and a slide connecting seat 342 at its two ends, respectively. A knife mounting seat 35 is connected to the gantry connecting seat. The slide cylinder 33 is connected to the slide connecting seat 342 via a slide cylinder mounting plate 37.

[0060] 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 upper inserting knife mechanism 3.

[0061] The upper inserter 31 is connected to the slide cylinder 33 via an inserter mounting plate 36. The upper inserter 31 includes an inserter plate 311 and a plurality of upper inserting teeth 312 disposed on the inserter plate. The upper inserting teeth 312 are provided with upper slots 314 between each other. A connecting slot 313 is provided at the upper end of the inserter plate. The inserter mounting plate 36 is inserted into the connecting slot 313 and fixedly connected to the inserter.

[0062] The lower folding knife mechanism 6 includes a lower folding knife assembly 7, a folding width adjustment mechanism 8, and a folding height adjustment mechanism 9.

[0063] The lower folding blade assembly 7 is controlled to open and close by the folding width adjustment mechanism 8, so that the lower folding blade assembly 7 can open to a certain width as needed. The folding width adjustment mechanism 8 is set on the lower folding blade mounting plate 81, and the lower folding blade mounting plate 81 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 7 can move up and down reciprocally.

[0064] The lower folding blade assembly 7 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 several lower insert teeth 74 vertically arranged on the upper end of the inclined side plate 73. The ends of the lower insert teeth 74 are provided with a flattening structure 75. Several adjustable mounting holes 76 are provided on the horizontal base plate 72.

[0065] 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.

[0066] 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 7 on it to open or close.

[0067] 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.

[0068] 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 7 and the folding width adjustment mechanism 8 set on the lower folding knife mounting plate 81 to rise and fall together.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 lower toothed teeth 74 on the lower folding blade 71.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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, and can control the front and rear material fixing plates to separate or merge. When the front and rear material fixing plates are in the merged state, the grooves on the front and rear material fixing plates close and form a material fixing window 10. The folding clamping plate 522 is provided with a material fixing opening 5221, and insertion tooth grooves 5222 that mesh with the lower insertion teeth are provided on both sides of the material fixing opening. The opening width of the lower folding blade is controlled by the folding width adjustment mechanism 8, thereby controlling the engagement depth of the lower insertion teeth with the insertion tooth grooves to meet the needs of folding materials for different pocket widths without changing the folding blade size.

[0082] The sewing machine uses a bag-opening and folding mechanism to perform the folding process as follows: 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: Under the control of the insertion height adjustment mechanism 32, the upper insertion knife mechanism 3 drives the upper insertion knife 31 to descend, and the upper insertion knife folds the cut fabric towards the bottom of the fixed material window 10 to perform the first folding. Step 3: Under the control of the clamp lifting mechanism 53, the folding clamp assembly 52 below the large template assembly 51 is lowered a certain height away from the large template assembly and is in an open state. Step 4: The lower folding knife assembly 7 moves upward to the specified height according to the thickness of the fabric through the folding height adjustment mechanism 9, and engages with the upper slot of the upper insert knife; Step 5: The folding width adjustment mechanism 8 controls the lower folding blade 71 to open to both sides. The unfolding of the lower folding blade 71 drives the lower inserting teeth to flatten the fabric by folding the fabric with the front and rear fixed material plates facing the lower plate surfaces respectively. The fabric is folded for the second time. Then, the upper inserting blade mechanism 3 rises and resets under the control of the inserting blade height adjustment mechanism 32. 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 lower 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.

[0083] In the above embodiments, the bag opening and folding mechanism increases the clamping area of ​​the clamping plates on the front and back of the fabric through a toothed meshing structure, thereby reducing the problem of bag fabric edge misalignment. The direct-drive method of the lower folding knife is more efficient and less expensive than existing structures. The overall structure has good coordination of operation, high working efficiency, good stability, and high control precision.

[0084] This sewing machine uses an upper insert blade and a lower folding blade to fold the material together, and finally the clamping plate completes the bag folding function. The interlocking pressing of the insert teeth of the lower folding blade and the insert teeth of the clamping plate increases the clamping area of ​​the clamping plate for the front and rear edges of the bag fabric, effectively preventing the bag fabric edges from shifting during operation. Compared with the traditional folding blade, which retracts after the clamping plate has completed its work, the direct drive of the lower folding blade is more efficient and less costly, and also avoids the problem of the bag fabric edges shifting due to the retraction of the folding blade.

Claims

1. A bag opening and material folding mechanism comprising a material positioning window (10) for achieving material positioning, characterized in that: The upper and lower straight drive linkage folding blade mechanisms (3) and (6) are arranged on the upper and lower sides of the material positioning window (10), the upper blade mechanism (3) is provided with an upper blade slot (314), the lower blade mechanism (6) is provided with lower blade teeth (74) engaging with the upper blade slot (314), and the folding blade clamping plate assembly (52) provided with blade teeth slots (5222) is arranged below the material positioning window.

2. The bag opening and flap folding mechanism of claim 1, wherein: The upper blade mechanism (3) comprises an upper blade (31) and a blade height adjusting mechanism (32), the upper blade (31) is connected to the blade height adjusting mechanism (32) and controlled to rise and fall through the blade height adjusting mechanism (32).

3. The bag opening and flap folding mechanism of claim 2, wherein: The upper blade (31) comprises a blade plate (311) and a plurality of upper blade teeth (312) arranged on the blade plate, the upper blade teeth (312) form the upper blade slot (314) between each other, the blade plate (311) is detachably connected to the blade height adjusting mechanism (32) through a blade mounting plate (36), and the blade height adjusting mechanism (32) adopts an automatic lifting adjusting device.

4. A bag opening and flap folding mechanism according to any one of claims 1 to 3, characterized in that: The lower blade mechanism (6) comprises a lower blade assembly (7), a blade width adjusting mechanism (8) controlling the opening and closing movement of the lower blade assembly (7), and a blade height adjusting mechanism (9) controlling the lifting of the lower blade assembly (7).

5. The bag opening and flap folding mechanism of claim 4, wherein: The lower blade assembly (7) comprises a pair of open and close lower blades (71), the lower blade teeth (74) are evenly arranged at the end of the lower blade (71), and the lower blade teeth (74) are provided with a flat structure (75).

6. The bag opening and flap folding mechanism of claim 4, wherein: The blade width adjusting mechanism (8) adopts a servo motor screw rod transmission mechanism, or the blade width adjusting mechanism (8) adopts a hydraulic parallel opening and closing mechanism, the blade height adjusting mechanism (9) adopts a screw rod transmission mechanism, or a cylinder transmission mechanism, or a wheel transmission mechanism.

7. The bag opening and flap folding mechanism according to any one of claims 1 to 3, characterized in that: The folding blade clamping plate assembly (52) is arranged below a large mold plate (511), the folding blade clamping plate assembly (52) comprises a folding blade clamping piece flattening plate (521) and the folding blade clamping piece (522) with teeth arranged in a stack, the middle part of the folding blade clamping piece (522) is provided with a material positioning port (5221), and the blade teeth slots (5222) are evenly arranged on the two sides of the material positioning port (5221).

8. The bag opening and flap folding mechanism of claim 7, wherein: The large mold plate (511) is integrated with a clamping plate lifting mechanism (53), a material positioning piece mechanism (54) and a folding blade clamping piece locking mechanism (55), the material positioning piece mechanism (54) comprises a material positioning piece switch (544), a front material positioning piece (542) and a rear material positioning piece (543) driven by the material positioning piece switch (544), and a material positioning window (10) is formed when the front material positioning piece (542) and the rear material positioning piece (543) are in a combined state.

9. A method of opening a bag of material, the method comprising: The method comprises the following steps: S1: conveying the fabric with a fabric stop port to the material positioning window; S2: lowering the upper blade, and the upper blade performs first folding on the cut fabric port to the lower side of the material positioning window; S3: lowering the folding blade clamping plate assembly to open; S4: The lower folding knife assembly rises to a specified height according to the thickness of the fabric and is embedded with the upper insertion slot of the upper insertion knife; S5: The lower folding knife is opened to both sides, and the fabric stopper is flattened towards both sides by the expansion of the folding knife, and the fabric is folded for the second time; the upper insertion knife is reset; S6: The folding clamp plate assembly is reset to rise and clamp the folded fabric stopper, and is locked and positioned by the folding clamp locking mechanism; the lower folding knife assembly is reset downward.

10. A sewing machine characterized by: The bag opening and fabric folding mechanism comprises the bag opening and fabric folding mechanism according to any one of claims 1-8.

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