Composite mold for manufacturing double-layer pocket flap and sewing method of double-layer pocket flap
By using composite molds and a variety of through-grooving and edge-retaining components, the problems of cumbersome operation and unstable quality during the sewing process of double-layer bag covers are solved, and efficient and stable bag cover production is achieved.
Patent Information
- Application Number
- CN202510709112.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-29
- Publication Date
- 2025-08-01
AI Technical Summary
In the prior art, the sewing process of the double-layer bag cover is complicated, and the multi-layer alignment is difficult to operate accurately, resulting in low production efficiency and unstable product quality.
Composite molds are adopted, including base plate, cover plate, bag cover inner pressure plate, bag cover laminate, bag cover surface pressure plate and left flip plate on the bag cover surface. A variety of grooves and edge-retaining components are set up to facilitate the placement and uniform folding of the cut pieces through flexible connection and folding and stretching components, ensuring the uniform size of the two ends of the bag cover.
It simplifies the operation process, improves work efficiency, ensures the stability of product quality, reduces the rework rate, and achieves uniformity and accuracy of the dimensions of both ends of the bag cover.
Smart Images
Figure CN120401140A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a composite mold for making a double-layer bag cover and a sewing method for the double-layer bag cover, belonging to the technical field of clothing tools. Background Art
[0002] The double-layer bag cover is a common bag cover design form for current foreign trade work uniforms, professional uniforms, and outdoor work uniforms; the double-layer bag cover increases the layering, detail sense, and decorative property of the clothing, and strengthens the design style; since the double-layer bag cover includes a cut cover surface, a cut cover lining, and a cut cover interlayer, with a relatively large number of layers and a complex structure, the cut piece of the bag cover surface is 4 cm longer than the cut piece of the bag cover lining. When sewing both sides of the bag cover, the cut piece of the bag cover surface must be folded back by 4 cm, and then the size of the cut piece is made to match that of the bag cover lining; when sewing the outer opening of the bag cover, the folded-back 4 cm needs to be evenly pushed to both ends, so that after sewing and forming, both ends of the bag cover surface are respectively 1 cm longer than the net prints at both ends of the bag cover lining. When using manual sewing, multiple layers need to be aligned by manually drawing a lot of prints, the process is cumbersome, the accurate operation of multiple-layer alignment is difficult, time-consuming and laborious; moreover, due to the technical differences of operators, the slopes and sizes of the bag covers sewn manually are inconsistent, the quality cannot be effectively controlled, the rework rate is high, seriously affecting the quality of the finished clothing and the production efficiency is low. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a composite mold for making a double-layer bag cover and a sewing method for the double-layer bag cover, which are convenient for placing cut pieces, simple to operate, save processes, ensure uniform sizes at both ends of the bag cover, have high working efficiency, and stable product quality.
[0004] The present invention adopts the following technical solutions:
[0005] The composite mold for making a double-layer bag cover of the present invention includes a bottom plate, a cover plate flexibly connected to the rear side edge of the bottom plate, a bag cover lining pressing plate flexibly connected to the front side top surface of the bottom plate, a bag cover interlayer pressing plate flexibly connected to the front side top surface of the bag cover lining pressing plate, a bag cover surface pressing plate flexibly connected to the front side edge of the bag cover lining pressing plate, and a bag cover surface left folding plate flexibly connected to the left front side top surface of the bag cover surface pressing plate; a lower sewing line through groove and an upper sewing line through groove that coincide after buckling are provided on the bottom plate and the cover plate; a folding and stretching component is arranged in the bag cover interlayer pressing plate; a side blocking component is arranged on the bottom plate, the bag cover lining pressing plate, and the bag cover interlayer pressing plate; a keyhole positioning hole is vertically arranged on the bag cover interlayer pressing plate, and a placing bag cover interlayer positioning line that coincides with the midline of the keyhole positioning hole is arranged on the top surface of the bag cover lining pressing plate; the bag cover lining pressing plate, the bag cover interlayer pressing plate, the bag cover surface pressing plate, and the bag cover surface left folding plate are buckled and arranged between the bottom plate and the cover plate.
[0006] The mold bottom plate and the cover plate of the present invention are rectangular and of equal size after being buckled; the lower suture through groove includes a lower horizontal through groove provided at the rear side of the bottom plate, a lower left through groove provided at the left side of the bottom plate, and a lower right through groove provided at the right side of the bottom plate. The lower left through groove and the lower right through groove are parallel and obliquely inclined to the right from back to front; the rear end of the lower left through groove intersects with the left end of the lower horizontal through groove, and the rear end of the lower right through groove intersects with the right end of the lower horizontal through groove; after the bag lid inner pressing plate, the bag lid sandwich pressing plate, the bag lid surface pressing plate, and the left side folding plate of the bag lid are buckled: the bag lid inner pressing plate, the bag lid sandwich pressing plate, the bag lid surface pressing plate, and the left side folding plate of the bag lid are all arranged between the lower left through groove and the lower right through groove; the left and right sides of the bag lid inner pressing plate, the bag lid sandwich pressing plate, the bag lid surface pressing plate, and the left side folding plate of the bag lid are all parallel to the lower left through groove and the lower right through groove, and the rear sides are all parallel to the lower horizontal through groove; the left sides of the bag lid inner pressing plate and the bag lid sandwich pressing plate are flush with the right side of the lower left through groove, the rear sides of the bag lid inner pressing plate and the bag lid sandwich pressing plate are flush with the lower horizontal through groove, and the right sides of the bag lid inner pressing plate, the bag lid sandwich pressing plate, and the left side folding plate of the bag lid are flush with the left side of the lower right through groove; the left side of the bag lid surface pressing plate overlaps with the right side of the left side folding plate of the bag lid; the upper suture through groove includes an upper horizontal through groove provided at the rear side of the cover plate, an upper left through groove provided at the left side of the cover plate, and an upper right through groove provided at the right side of the cover plate. The upper left through groove and the upper right through groove are parallel and obliquely inclined to the right from back to front; the rear end of the upper left through groove intersects with the left end of the upper horizontal through groove, and the rear end of the upper right through groove intersects with the right end of the upper horizontal through groove; after the bottom plate and the cover plate are buckled: the lower horizontal through groove coincides with the upper horizontal through groove, the lower left through groove coincides with the upper left through groove, and the lower right through groove coincides with the upper right through groove.
[0007] The mold edge guard assembly of the present invention includes a bag lid inner edge guard assembly disposed on the bottom plate, a bag lid sandwich edge guard assembly disposed on the bag lid inner pressing plate, and a bag lid surface edge guard assembly disposed on the bag lid sandwich pressing plate; the bag lid inner edge guard assembly includes a rear bag lid inner edge guard strip plate disposed parallel to the rear side of the lower horizontal through groove, a right ┛-shaped bag lid inner edge guard strip plate and a right ┓-shaped bag lid inner edge guard strip plate disposed on the right side of the lower right through groove, a left L-shaped bag lid inner edge guard strip plate disposed on the left side of the lower left through groove, and a corner bag lid inner edge guard strip plate disposed in a chamfer shape at the intersection of the lower left through groove and the lower horizontal through groove; the right end of the lower horizontal through groove is disposed between the right ┛-shaped bag lid inner edge guard strip plate and the right ┓-shaped bag lid inner edge guard strip plate, the side plates of the right ┛-shaped bag lid inner edge guard strip plate and the right ┓-shaped bag lid inner edge guard strip plate are collinear and parallel to the lower right through groove, and the side plate of the left L-shaped bag lid inner edge guard strip plate is parallel to the lower horizontal through groove; the top angle of the right ┓-shaped bag lid inner edge guard strip plate is in an inverted V shape, the bottom angle of the left L-shaped bag lid inner edge guard strip plate is in a V shape, and the bottom edge of the right ┛-shaped bag lid inner edge guard strip plate slopes downward obliquely from right to left; after the bag lid surface pressing plate, the left side folding plate of the bag lid surface are buckled with the bottom plate: the rear side edges of the bag lid surface pressing plate and the left side folding plate of the bag lid surface are located behind the rear bag lid inner edge guard strip plate; the area enclosed by the left L-shaped bag lid inner edge guard strip plate, the corner bag lid inner edge guard strip plate, the rear bag lid inner edge guard strip plate, the right ┓-shaped bag lid inner edge guard strip plate, and the right ┛-shaped bag lid inner edge guard strip plate matches the shape of the bag lid inner cut piece; the bag lid sandwich edge guard assembly includes the left L-shaped bag lid inner edge guard strip plate, a bag lid sandwich edge guard strip plate disposed at the top edge of the rear side of the bag lid inner pressing plate, and the right ┛-shaped bag lid inner edge guard strip plate; after the bag lid inner pressing plate is buckled: the area enclosed by the left L-shaped bag lid inner edge guard strip plate, the bag lid sandwich edge guard strip plate, and the right ┛-shaped bag lid inner edge guard strip plate matches the shape of the bag lid sandwich; the bag lid surface edge guard assembly includes the left L-shaped bag lid inner edge guard strip plate, the corner bag lid inner edge guard strip plate, the rear bag lid inner edge guard strip plate, the right ┛-shaped bag lid inner edge guard strip plate, and the right ┓-shaped bag lid inner edge guard strip plate, a bag lid surface right front edge guard strip plate disposed on the top right front side of the bag lid sandwich pressing plate, and a bag lid surface left front edge guard strip plate disposed on the top left front side of the bag lid sandwich pressing plate, the right end of the right front edge guard strip plate corresponds to the end of the right ┛-shaped bag lid inner edge guard strip plate, and the left end of the bag lid surface left front edge guard strip plate corresponds to the right end of the left L-shaped bag lid inner edge guard strip plate.
[0008] On the top surface of the bag lid surface pressing plate of the mold of the present invention, a bag lid surface folding mark edge guard strip plate is disposed 2 cm away from the left side edge of the bag lid surface pressing plate. The bag lid surface folding mark edge guard strip plate is parallel to the left side edge of the bag lid surface pressing plate. The left side edge of the bag lid surface pressing plate is the edge guard for the rightward folding of the bag lid surface. After the bag lid surface pressing plate and the left side folding plate of the bag lid surface are buckled: the right side edge of the left side folding plate of the bag lid surface abuts against the left side edge of the bag lid surface folding mark edge guard strip plate, and the right side edge of the left side folding plate of the bag lid surface is the edge guard for the leftward folding of the bag lid surface.
[0009] The sandwich pressing plate of the bag cover in the buckled state of the mold of the present invention includes a backing plate and an upper plate. The folding and stretching component is arranged between the backing plate and the upper plate. The folding and stretching component includes a rear limiting plate and a front limiting plate fixedly arranged between the backing plate and the upper plate, and a left sliding plate and a right sliding plate slidably arranged on both sides of the rear limiting plate. The left sliding plate and the right sliding plate are abutted against both sides of the limiting plate. A U-shaped card slot is arranged on the rear side edge of the front limiting plate. The left side edge of the left sliding plate is parallel to the side plate of the L-shaped inner baffle strip of the bag cover and flush with the right side edge of the lower left through groove. The right side edge of the right sliding plate is parallel to the side plate of the right ┛-shaped inner baffle strip of the bag cover and flush with the left side edge of the lower right through groove. A rectangular left adjusting hole is arranged on the left sliding plate, and a rectangular right adjusting hole is arranged on the right sliding plate. A left square fixing plate and a right square fixing plate are fixedly arranged on the backing plate. The left square fixing plate is arranged in the left adjusting hole with a gap, and the right square fixing plate is arranged in the right adjusting hole with a gap. A rectangular window is arranged on the front side of the upper plate. A left pushing plate fixed to the left sliding plate is arranged inside the left side of the window. The left end of the left pushing plate protrudes forward and corresponds to the left side edge of the U-shaped card slot. A left operation hole is arranged at the right end of the left pushing plate. A right pushing plate fixed to the right sliding plate is arranged inside the right side of the window. The right end of the right pushing plate protrudes forward and corresponds to the right side edge of the U-shaped card slot. A right operation hole is arranged at the left end of the right pushing plate. Press the left operation hole and push the left pushing plate 1 cm to the left so that the left side edge of the left sliding plate abuts against the right side of the L-shaped inner baffle strip of the bag cover. At this time, the left square fixing plate abuts against the right side edge of the left adjusting hole, and at the same time, the left end of the left pushing plate protrudes and abuts against the left side edge of the U-shaped card slot. Press the right operation hole and push the right pushing plate 1 cm to the right so that the right sliding plate abuts against the left side of the right ┛-shaped inner baffle strip of the bag cover. The right square fixing plate abuts against the left side edge of the right adjusting hole, and at the same time, the right end of the right pushing plate protrudes and abuts against the right side edge of the U-shaped card slot.
[0010] The cover plate of the mold of the present invention includes a left cover plate corresponding to the left folding plate after buckling and a right cover plate corresponding to the bag cover surface pressing plate. A left hollow is arranged on the left cover plate, and a right hollow is arranged on the right cover plate. Located on the buckling surface of the cover plate: an upper padding strip is fixed on the rear side edge of the upper horizontal through groove, a left upper padding strip is fixed on the left side edge of the upper left through groove, and a right upper padding strip is fixed on the right side edge of the upper right through groove. Anti-slip strip A is arranged on the buckling surfaces of the upper padding strip, the left upper padding strip and the right upper padding strip. Anti-slip strip B is arranged on the outer side of the left hollow, the outer side of the right hollow and the front side of the upper horizontal through groove.
[0011] Anti-slip strip C is arranged between the lower horizontal through groove and the rear inner baffle strip of the bag cover, between the lower left through groove and the left L-shaped inner baffle strip of the bag cover, between the lower right through groove and the right ┛-shaped inner baffle strip of the bag cover, and between the lower right through groove and the right ┓-shaped inner baffle strip of the bag cover. Anti-slip strip D is arranged inside the lower horizontal through groove, the lower left through groove and the lower right through groove. Anti-slip strip E is arranged on both side edges of the top surface of the bag cover inner pressing plate.
[0012] The method for manufacturing a double-layer bag cover of the present invention adopts the following steps:
[0013] S1. Place the composite mold on the workbench, lift the cover plate backward, and then lift the left folding plate of the bag cover surface, the pressing plate of the bag cover surface, the pressing plate of the bag cover sandwich, and the pressing plate of the bag lining of the bag cover forward in sequence. Lay the cut piece of the bag lining within the area enclosed by the left L-shaped edge strip of the bag lining, the corner edge strip of the bag lining, the rear edge strip of the bag lining, the right ┓-shaped edge strip of the bag lining, and the right ┛-shaped edge strip of the bag lining.
[0014] S2. Fasten and press the pressing plate of the bag lining on the upper surface of the bag lining. Lay the bag cover sandwich within the area enclosed by the left L-shaped edge strip of the bag lining, the edge strip of the bag cover sandwich, and the right ┛-shaped edge strip of the bag lining. Adjust to make the center line of the keyhole of the bag cover sandwich coincide with the positioning line of the bag cover sandwich. Fasten and press the pressing plate of the bag cover sandwich on the upper surface of the bag cover sandwich, and make the keyhole of the bag cover sandwich coincide with the keyhole positioning hole.
[0015] S3. Lay the bag cover surface on the pressing plate of the bag cover sandwich. Lay the right side of the bag cover surface within the area enclosed by the rear edge strip of the bag lining, the right ┓-shaped edge strip of the bag lining, the right ┛-shaped edge strip of the bag lining, and the right front side edge strip of the bag cover surface. Fasten and press the pressing plate of the bag cover surface on the right side surface of the bag cover surface. Fold the left side of the bag cover surface obliquely to the right along the left side edge of the pressing plate of the bag cover surface and press it on the surface of the pressing plate of the bag cover surface. Fasten and press the left folding plate of the bag cover surface on the bag cover surface on the surface of the left pressing plate of the bag cover surface. The right side edge of the left folding plate of the bag cover surface abuts against the left side edge of the return folding mark edge strip of the bag cover surface. The width of the bag cover surface pressed by the left folding plate is 2 cm. Then fold the bag cover surface back 2 cm obliquely to the left along the right side edge of the left folding plate of the bag cover surface. The folded-back bag cover surface is laid within the area enclosed by the left L-shaped edge strip of the bag lining, the corner edge strip of the bag lining, and the left front edge strip of the bag cover surface. Manually press the folded-back bag cover surface and fasten the left cover plate to press on the left side of the bag cover surface so that the left hollow passes through the hand position being pressed. Then fasten the right cover plate downward to press on the right side surface of the bag cover surface. After overall fastening, place the mold under the presser foot of the flat sewing machine and sew the two sides of the bag cover along the coincident left through slot and right through slot.
[0016] S4. After sewing, take it out and place it on the workbench. Lift the left cover plate and the right cover plate backward. Pull out the left folding plate of the bag cover surface forward from between the bag cover surface and the bag cover sandwich. Then lift the pressing plate of the bag cover surface forward. Slightly lift the bag cover surface. Press the left operation hole and push the left push plate 1 cm to the left so that the left side edge of the left slide plate abuts against the right side edge of the L-shaped edge strip of the bag lining. Stretch the 4 cm of the folded-back bag cover surface cut piece to the left and flatten it by 2 cm. At this time, the left square fixing plate abuts against the right side edge of the left adjustment hole, and at the same time, the left end of the left push plate protrudes and abuts against the left side edge of the U-shaped card slot. Press the right operation hole and push the right push plate 1 cm to the right so that the right slide plate abuts against the left side of the right ┛-shaped edge strip of the bag lining. Stretch the 4 cm of the folded-back bag cover surface cut piece to the right and flatten it by 2 cm. The right square fixing plate abuts against the left side edge of the right adjustment hole, and at the same time, the right end of the right push plate protrudes and abuts against the right side edge of the U-shaped card slot.
[0017] S5. Close the cover plate, place the mold under the presser foot of the flat sewing machine, sew along the overlapping horizontal through slots to stitch the outer opening of the bag cover. After sewing, take out the mold, lift the cover plate and remove the sewn bag cover.
[0018] The positive effects of the present invention are as follows: The transparent bottom plate, cover plate, bag cover inner pressing plate, bag cover sandwich pressing plate, bag cover surface pressing plate and left folding plate of the bag cover surface of the present invention are all flexibly connected, which is convenient for opening and closing; the bag cover surface cut piece is 4 cm longer than the bag cover inner cut piece. When sewing both sides of the bag cover, the bag cover surface cut piece is folded back 4 cm through the bag cover surface pressing plate and the left folding plate of the bag cover surface to ensure the folding size, and the size of the bag cover surface cut piece matches that of the bag cover inner; when sewing the outer opening of the bag cover, by directly pushing the left and right sliding plates of the bag cover sandwich pressing plate, the folded 4 cm is evenly pushed to both ends and stretched flat, so that both ends of the bag cover surface are 1 cm longer than the net prints at both ends of the bag cover inner. This not only ensures uniform dimensions at both ends of the bag cover and stabilizes the product quality, but also saves a lot of time for drawing prints on the bag cover surface and inner, improving work efficiency.
[0019] The area enclosed by the left L-shaped bag cover inner edge strip plate, corner bag cover inner edge strip plate, rear bag cover inner edge strip plate, right ┛-shaped bag cover inner edge strip plate and right ┓-shaped bag cover inner edge strip plate matches the shape of the bag cover inner cut piece, which is convenient for determining the placement and positioning of the bag cover inner cut piece; the bag cover sandwich pressing plate is provided with keyhole positioning holes and the top surface of the bag cover inner pressing plate is provided with a bag cover sandwich positioning line, which is convenient for controlling the distance between the bag cover inner and the outer opening of the bag cover and the distance between the keyhole and both ends of the bag cover when placing the bag cover sandwich.
[0020] The bottom plate and cover plate of the present invention are made of transparent PVC plates with a thickness of 1.5 mm, the bag cover inner pressing plate, bag cover surface pressing plate and left folding plate of the bag cover surface are made of transparent PVC plates with a thickness of 0.5 mm, and the bag cover sandwich pressing plate is made of a transparent PVC plate and a fiberglass yellow plate with a thickness of 0.5 mm. It is possible to clearly observe the placement of the cut pieces for adjustment. Using the mold of the present invention is convenient for operation, reduces processes, and saves time and effort. Description of the Drawings
[0021] Attached Figure 1 is a schematic structural diagram of the present invention;
[0022] Attached Figure 2 is a schematic structural diagram of the present invention in a layered unfolded state;
[0023] Attached Figure 3 is a schematic structural diagram of the parts assembly of the present invention;
[0024] Attached Figure 4 is a schematic structural diagram of the bottom plate of the present invention;
[0025] Attached [[ID=3,5]] Figure 5 is a schematic structural diagram of the bag cover inner pressing plate of the present invention;
[0026] Attached Figure 6Schematic diagram of the laminated plate in the bag cover sandwich and its unfolded state structure;
[0027] Appendix Figure 7 Schematic diagram of the assembly structure of the parts of the laminated plate in the bag cover sandwich of the present invention;
[0028] Appendix Figure 8 Schematic diagram of the surface laminated plate of the bag cover of the present invention;
[0029] Appendix Figure 9 Schematic diagram of the left folding plate of the present invention.
[0030] In the attached drawings:
[0031] 1 Bottom plate, 11 Lower horizontal through groove, 12 Lower left through groove, 13 Lower right through groove, 101 Right ┛-shaped inner edge strip of the bag cover, 102 Right ┓-shaped inner edge strip of the bag cover, 103 Rear inner edge strip of the bag cover, 104 Corner inner edge strip of the bag cover, 105 Left L-shaped inner edge strip of the bag cover, 106 Anti-slip strip C, 107 Anti-slip strip D;
[0032] 2 Cover plate, 21 Upper horizontal through groove, 22 Upper left through groove, 23 Upper right through groove, 201 Left cover plate, 202 Right cover plate, 203 Left hollow, 204 Right hollow, 205 Upper padding strip, 206 Upper left padding strip, 207 Upper right padding strip, 208 Anti-slip strip A, 209 Anti-slip strip B,
[0033] 3 Inner laminated plate of the bag cover, 301 Inner edge strip of the bag cover sandwich, 302 Positioning line of the bag cover sandwich, 303 Anti-slip strip E;
[0034] 4 Laminated plate of the bag cover sandwich, 41 Base plate, 401 Left square fixing plate, 402 Right square fixing plate, 42 Upper plate, 43 Rear limiting plate, 44 Left sliding plate, 440 Left adjusting hole, 441 Left pushing plate, 442 Left operating hole, 45 Right sliding plate, 450 Right adjusting hole, 451 Right pushing plate, 452 Right operating hole, 46 Window opening, 47 Keyhole positioning hole, 48 Front limiting plate, 49 Anti-slip strip F, 481 U-shaped card slot, 491 Right front side edge strip, 492 Left front edge strip;
[0035] 5 Surface laminated plate of the bag cover, 501 Return folding mark edge strip of the bag cover surface;
[0036] 6 Left folding plate on the surface of the bag cover; Detailed implementation manner
[0037] In the description of the present invention, the side of the bottom plate 1 corresponding to the operator is the front, and the side away from the operator is the rear.
[0038] As shown in the appendix Figures 1-3As shown in the figure, the composite mold for making a double-layer bag cover of the present invention includes a bottom plate 1, a cover plate 2 flexibly connected to the rear side edge of the bottom plate 1, a bag cover inner pressing plate 3 flexibly connected to the front side top surface of the bottom plate 1, a bag cover sandwich pressing plate 4 flexibly connected to the front side top surface of the bag cover inner pressing plate 3, a bag cover surface pressing plate 5 flexibly connected to the front side edge of the bag cover inner pressing plate 3, and a bag cover surface left folding plate 6 flexibly connected to the left front side top surface of the bag cover surface pressing plate 5; a lower sewing line through groove and an upper sewing line through groove that coincide after buckling are provided on the bottom plate 1 and the cover plate 2; a folding and stretching component is arranged in the bag cover sandwich pressing plate 4; the flexible connection is through adhesive tape or tape connection, which is convenient for lifting and buckling; a baffle component is arranged on the bottom plate 1, the bag cover inner pressing plate 3 and the bag cover sandwich pressing plate 4; the bag cover inner pressing plate 3, the bag cover sandwich pressing plate 4, the bag cover surface pressing plate 5 and the bag cover surface left folding plate 6 are arranged between the bottom plate 1 and the cover plate 2 after buckling.
[0039] As shown in the attached Figures 1-4 figure, the bottom plate 1 and the cover plate 2 of the present invention are rectangular and have the same size after buckling; the lower sewing line through groove includes a lower horizontal through groove 11 arranged at the rear side of the bottom plate 1, a lower left through groove 12 arranged at the left side of the bottom plate 1, and a lower right through groove 13 arranged at the right side of the bottom plate 1. The lower left through groove 12 and the lower right through groove 13 are parallel and obliquely inclined to the right from back to front; the rear end of the lower left through groove 12 intersects with the left end of the lower horizontal through groove 11, and the rear end of the lower right through groove 13 intersects with the right end of the lower horizontal through groove 11.
[0040] After the bag cover inner pressing plate 3, the bag cover sandwich pressing plate 4, the bag cover surface pressing plate 5 and the bag cover surface left folding plate 6 are buckled: the bag cover inner pressing plate 3, the bag cover sandwich pressing plate 4, the bag cover surface pressing plate 5 and the bag cover surface left folding plate 6 are all arranged between the lower left through groove 12 and the lower right through groove 13; the left and right sides of the bag cover inner pressing plate 3, the bag cover sandwich pressing plate 4, the bag cover surface pressing plate 5 and the bag cover surface left folding plate 6 are parallel to the lower left through groove 12 and the lower right through groove 13, and the rear side edges are parallel to the lower horizontal through groove 11; the left side edges of the bag cover inner pressing plate 3 and the bag cover sandwich pressing plate 4 are flush with the right side edge of the lower left through groove 12, the rear side edges of the bag cover inner pressing plate 3 and the bag cover sandwich pressing plate 4 are flush with the lower horizontal through groove 11, and the right side edges of the bag cover inner pressing plate 3, the bag cover sandwich pressing plate 4 and the bag cover surface left folding plate 6 are flush with the left side edge of the lower right through groove 13; the left side of the bag cover surface pressing plate 5 overlaps with the right side of the bag cover surface left folding plate 6, and the left side edge of the bag cover surface left folding plate 6 is arranged on the right side of the lower left through groove 12.
[0041] The upper suture groove includes an upper horizontal groove 21 arranged at the rear side of the cover plate 2, a left upper groove 22 arranged at the left side of the cover plate 2, and a right upper groove 23 arranged at the right side of the cover plate 2. The left upper groove 22 and the right upper groove 23 are parallel and inclined to the right from the rear to the front. The rear end of the left upper groove 22 intersects with the left end of the upper horizontal groove 21, and the rear end of the right upper groove 23 intersects with the right end of the upper horizontal groove 21. After the bottom plate 1 and the cover plate 2 are buckled: the lower horizontal groove 11 coincides with the upper horizontal groove 21, the lower left groove 12 coincides with the left upper groove 22, and the lower right groove 13 coincides with the right upper groove 23.
[0042] As shown in Figure 4 、 5 Figures 7 and 8, the edge blocking component of the present invention includes a bag lid inner edge blocking component arranged on the bottom plate 1, a bag lid sandwich edge blocking component arranged on the bag lid inner pressing plate 3, and a bag lid surface edge blocking component arranged on the bag lid sandwich pressing plate 4;
[0043] The bag lid inner edge blocking component includes a rear bag lid inner edge blocking strip 103 arranged in parallel at the rear side of the lower horizontal groove 11, a right ┛ - shaped bag lid inner edge blocking strip 101 and a right ┓ - shaped bag lid inner edge blocking strip 102 arranged on the right side of the lower right groove 13, a left L - shaped bag lid inner edge blocking strip 105 arranged on the left side of the lower left groove 12, and a corner bag lid inner edge blocking strip 104 arranged in a chamfer shape at the intersection of the lower left groove 12 and the lower horizontal groove 11. The right end of the lower horizontal groove 11 is arranged between the right ┛ - shaped bag lid inner edge blocking strip 101 and the right ┓ - shaped bag lid inner edge blocking strip 102. The side plates of the right ┛ - shaped bag lid inner edge blocking strip 101 and the right ┓ - shaped bag lid inner edge blocking strip 102 are collinear and parallel to the lower right groove 13. The side plate of the left L - shaped bag lid inner edge blocking strip 105 is parallel to the lower horizontal groove 11. The top angle of the right ┓ - shaped bag lid inner edge blocking strip 102 is in an inverted V - shape matching the upper right corner of the bag lid inner and the bag lid surface. The bottom angle of the left L - shaped bag lid inner edge blocking strip 105 is in a V - shape matching the lower left corner of the bag lid inner and the bag lid surface. The bottom edge of the right ┛ - shaped bag lid inner edge blocking strip 101 slopes downward from right to left. After the bag lid surface pressing plate 5 and the left - side folding plate 6 of the bag lid surface are buckled with the bottom plate 1: the rear side edges of the bag lid surface pressing plate 5 and the left - side folding plate 6 of the bag lid surface are located at the rear side of the rear bag lid inner edge blocking strip 103;
[0044] The area enclosed by the left L - shaped bag lid inner edge blocking strip 105, the corner bag lid inner edge blocking strip 104, the rear bag lid inner edge blocking strip 103, the right ┓ - shaped bag lid inner edge blocking strip 102 and the right ┛ - shaped bag lid inner edge blocking strip 101 matches the shape of the bag lid inner cut piece;
[0045] The bag cover sandwich edge guard assembly includes a left L-shaped inner bag cover edge guard strip 105, a bag cover sandwich edge guard strip 301 provided at the top edge of the rear side of the bag cover inner pressing plate 3, and a right ┛-shaped inner bag cover edge guard strip 101; after the bag cover inner pressing plate 3 is buckled: the area enclosed by the left L-shaped inner bag cover edge guard strip 105, the bag cover sandwich edge guard strip 301, and the right ┛-shaped inner bag cover edge guard strip 101 matches the shape of the bag cover sandwich.
[0046] The bag cover face edge guard assembly includes a left L-shaped inner bag cover edge guard strip 105, a corner inner bag cover edge guard strip 104, a rear inner bag cover edge guard strip 103, a right ┛-shaped inner bag cover edge guard strip 101, and a right ┓-shaped inner bag cover edge guard strip 102, a bag cover face right front edge guard strip 491 provided on the top right front side of the bag cover sandwich pressing plate 4, and a bag cover face left front edge guard strip 492 provided on the top left front side of the bag cover sandwich pressing plate 4. The right end of the right front edge guard strip 491 corresponds to the end of the right ┛-shaped inner bag cover edge guard strip 101, and the left end of the bag cover face left front edge guard strip 492 corresponds to the right end of the left L-shaped inner bag cover edge guard strip 105.
[0047] As shown in the appendix Figure 8 、 9 As shown in FIGS., a bag cover face folding mark edge guard strip 501 is provided on the top surface of the bag cover face pressing plate 5 and 2 cm away from the left side edge of the bag cover face pressing plate 5. The bag cover face folding mark edge guard strip 501 is parallel to the left side edge of the bag cover face pressing plate 5. The left side edge of the bag cover face pressing plate 5 is the edge for the bag cover to fold to the right. After the bag cover face pressing plate 5 is buckled with the left folding plate 6 of the bag cover face: the right side edge of the left folding plate 6 of the bag cover face abuts against the left side edge of the bag cover face folding mark edge guard strip 501, and the right side edge of the left folding plate 6 of the bag cover face is the edge for the bag cover to fold back to the left.
[0048] As shown in the appendix Figure 2 、 3 As shown in FIGS. 5, 6, and 7, keyhole positioning holes 47 are vertically provided on the bag cover sandwich pressing plate 4, and a placement bag cover sandwich positioning line 302 that coincides with the center line of the keyhole positioning holes 47 is provided on the top surface of the bag cover inner pressing plate 3.
[0049] The laminated plate 4 of the bag cover in the buckled state includes a backing plate 41 and an upper plate 42. The folding and stretching component is arranged between the backing plate 41 and the upper plate 42. The folding and stretching component includes a rear limiting plate 43 and a front limiting plate 48 fixedly arranged between the backing plate 41 and the upper plate 42, and a left sliding plate 44 and a right sliding plate 45 slidably arranged on both sides of the rear limiting plate 43; The middle keyhole positioning hole is arranged on the backing plate 41, and the keyhole positioning holes on the backing plate 41 and the upper plate 42 coincide with the keyhole positioning hole on the backing plate 41 to form the keyhole positioning hole 47; In the initial position, the left sliding plate 44 and the right sliding plate 45 are in contact with the limiting plate 43, the left side edge of the left sliding plate 44 is flush with the left side edges of the backing plate 41 and the upper plate 42, and the right side edge of the right sliding plate 45 is flush with the right side edges of the backing plate 41 and the upper plate 42. A U-shaped card slot 481 is arranged on the rear side edge of the front limiting plate 48. The left side edge of the left sliding plate 44 is parallel to the side plate of the L-shaped inner edge strip plate 105 of the bag cover and is flush with the right side edge of the lower left through groove 12. The right side edge of the right sliding plate 45 is parallel to the side plate of the right ┛-shaped inner edge strip plate 101 of the bag cover and is flush with the left side edge of the lower right through groove 13; A rectangular left adjustment hole 440 is arranged on the left sliding plate 44, a rectangular right adjustment hole 450 is arranged on the right sliding plate 45, a left square fixing plate 401 and a right square fixing plate 402 are fixedly arranged on the backing plate 41. The left square fixing plate 401 is arranged in the left adjustment hole 440 with a gap, and the right square fixing plate 402 is arranged in the right adjustment hole 450 with a gap. A rectangular opening 46 is arranged on the front side of the upper plate 42. A left push plate 441 fixed to the left sliding plate 44 is arranged inside the left side of the opening 46. The left end of the left push plate 441 protrudes forward and corresponds to the left side edge of the U-shaped card slot 481. A left operation hole 442 is arranged at the right end of the left push plate 441. A right push plate 451 fixed to the right sliding plate 45 is arranged inside the right side of the opening 46. The right end of the right push plate 451 protrudes forward and corresponds to the right side edge of the U-shaped card slot 481. A right operation hole 452 is arranged at the left end of the right push plate 451; Press the left operation hole 442 to push the left push plate 441 1 cm to the left so that the left side edge of the left sliding plate 44 abuts against the right side of the L-shaped inner edge strip plate 105 of the bag cover. At this time, the left square fixing plate 401 abuts against the right side edge of the left adjustment hole 440, and at the same time, the left end of the left push plate 441 protrudes and abuts against the left side edge of the U-shaped card slot 481. Press the right operation hole 452 to push the right push plate 451 1 cm to the right so that the right sliding plate 45 abuts against the left side of the right ┛-shaped inner edge strip plate 101 of the bag cover. The right square fixing plate 402 abuts against the left side edge of the right adjustment hole 450, and at the same time, the right end of the right push plate 451 protrudes and abuts against the right side edge of the U-shaped card slot 481. That is, the left sliding plate 44 and the right sliding plate 45 evenly stretch the 4 cm after the bag cover surface is folded to the left and right respectively, and coincide with the inner cut piece of the bag cover.
[0050] As shown in the appendix Figure 2 、 3As shown, the cover plate 2 includes a left cover plate 201 corresponding to the left folding plate 6 after buckling and a right cover plate 202 corresponding to the bag cover surface pressing plate 5; a left hollow 203 is provided on the left cover plate 201, and a right hollow 204 is provided on the right cover plate 202; the left hollow 203 and the right hollow 204 are irregular quadrilateral holes, and when buckling the left cover plate 201 and the right cover plate 202, press the cut piece by hand to prevent it from shifting. Located on the buckling surface of the cover plate 2: a top elevation strip 205 is fixed on the rear side edge of the upper horizontal through groove 21, a top left elevation strip 206 is fixed on the left side edge of the upper left through groove 21, and a top right elevation strip 207 is fixed on the right side edge of the upper right through groove 23; since a cover inner pressing plate 3, a bag cover sandwich pressing plate 4, a bag cover surface pressing plate 5 and a bag cover surface left folding plate 6 are provided between the bottom plate 1 and the cover plate 2, that is, there are more core plates between the bottom plate 1 and the cover plate 2, it is uneven when buckling and sewing the cover plate 2, which affects the passing of the roller presser foot. The elevation strips play a role in making the groove position horizontal and convenient for sewing. Anti-slip strips A208 are provided on the buckling surfaces of the top elevation strip 205, the top left elevation strip 206 and the top right elevation strip 207, and anti-slip strips B209 are provided on the outside of the left hollow 203, the outside of the right hollow 204 and the front side of the upper horizontal through groove 21.
[0051] As shown in the attached Figure 2 , 4 , 5, 6, anti-slip strips C106 are provided between the lower horizontal through groove 11 and the rear bag cover inner edge strip plate 103, between the lower left through groove 12 and the left L-shaped bag cover inner edge strip plate 105, between the lower right through groove 13 and the right ┛-shaped bag cover inner edge strip plate 101, and between the lower right through groove 13 and the right ┓-shaped bag cover inner edge strip plate 102; anti-slip strips D107 are provided inside the lower horizontal through groove 11, the lower left through groove 12 and the lower right through groove 13, an anti-slip strip E303 is provided on the side edge of the top surface of the bag cover inner pressing plate 3, and an anti-slip strip F49 is provided on the side edge of the top surface of the bag cover sandwich pressing plate 4; the anti-slip strips A208, anti-slip strips B209, anti-slip strips C106, anti-slip strips D107, anti-slip strip E303 and anti-slip strip F49 are all sandpaper or sandcloth to prevent the cut piece from shifting.
[0052] The bag cover sandwich is a semi-finished product, on which the buttonhole has been edge-locked, that is, the keyhole has been locked, and its lower end has been folded and ironed; as shown in the attached Figures 1-9 figure, the method for making a double-layer bag cover by a composite mold adopts the following steps:
[0053] S1. Place the clamped composite mold on the workbench, lift the cover plate 2 backward, and sequentially lift the left folding plate 6 of the bag cover surface, the bag cover surface pressing plate 5, the bag cover sandwich pressing plate 4, and the bag cover lining pressing plate 3 forward. Lay the bag cover lining cut piece in the area enclosed by the left L-shaped bag cover lining edge strip 105, the corner bag cover lining edge strip 104, the rear bag cover lining edge strip 103, the right ┓-shaped bag cover lining edge strip 102, and the right ┛-shaped bag cover lining edge strip 101. The upper right corner of the bag cover lining is embedded in the inverted V-shaped corner of the right ┓-shaped bag cover lining edge strip 102, and the lower left corner of the bag cover lining is embedded in the V-shaped corner of the left L-shaped bag cover lining edge strip 105;
[0054] S2. Clamp and press the bag cover lining pressing plate 3 on the upper surface of the bag cover lining. Lay the bag cover sandwich in the area enclosed by the left L-shaped bag cover lining edge strip 105, the bag cover sandwich edge strip 301, and the right ┛-shaped bag cover lining edge strip 101. Adjust to make the center line of the keyhole of the bag cover sandwich coincide with the bag cover sandwich positioning line 302. Clamp and press the bag cover sandwich pressing plate 4 on the upper surface of the bag cover sandwich. Adjust to make the keyhole of the bag cover sandwich coincide with the keyhole positioning hole 47;
[0055] S3. Lay the bag cover surface on the bag cover sandwich pressing plate 4. Make the right side of the bag cover surface lay in the area enclosed by the rear bag cover lining edge strip 103, the right ┓-shaped bag cover lining edge strip 102, the right ┛-shaped bag cover lining edge strip 101, and the right front side edge strip 491 of the bag cover surface. The upper right corner of the bag cover surface is embedded in the inverted V-shaped corner of the right ┓-shaped bag cover lining edge strip 102. Clamp and press the bag cover surface pressing plate 5 on the right side surface of the bag cover surface. Fold the left side of the bag cover surface obliquely to the right along the left side edge of the bag cover surface pressing plate 5 and press it on the surface of the bag cover surface pressing plate 5. Clamp and press the left folding plate 6 of the bag cover surface on the bag cover surface on the surface of the left bag cover surface pressing plate 5, so that the right side edge of the left folding plate 6 of the bag cover surface abuts against the left side edge of the bag cover surface return folding mark edge strip 501. The width of the bag cover surface pressed by the left folding plate 6 is 2 cm. Then fold the bag cover surface back 2 cm obliquely to the left along the right side edge of the left folding plate 6 of the bag cover surface. The folded bag cover surface to the left is laid in the area enclosed by the left L-shaped bag cover lining edge strip 105, the corner bag cover lining edge strip 104, and the left front side edge strip 492 of the bag cover surface. And the lower left corner of the bag cover surface is embedded in the V-shaped corner of the left L-shaped bag cover lining edge strip 105. Manually press the folded bag cover surface and clamp the left cover plate 201 so that the left hollow 203 passes through the pressed hand position and presses on the left side surface of the bag cover surface. Then clamp the right cover plate 202 downward and press it on the right side surface of the bag cover surface. After the composite mold is clamped as a whole, place the present invention under the presser foot and sew both sides of the bag cover along the coincident left through groove and right through groove;
[0056] S4. After stitching is completed, take out the mold and place it on the workbench. Lift the left cover plate 201 and the right cover plate 202 backward. Draw out the left folding plate 6 of the bag cover surface forward from between the bag cover surface and the bag cover interlayer. Then lift the bag cover surface pressing plate 5 forward slightly, lift the bag cover surface a little, press the left operation hole 442 and push the left push plate 441 1 cm to the left to make the left side of the left slide plate 44 abut against the right side of the L-shaped bag cover inner edge strip plate 105. Stretch the 4 cm of the folded-back bag cover surface piece 2 cm to the left evenly. At this time, the left square fixing plate 401 abuts against the right side of the left adjustment hole 440. At the same time, the left end of the left push plate 441 protrudes and abuts against the left side of the U-shaped card slot 481. Press the right operation hole 452 and push the right push plate 451 1 cm to the right to make the right slide plate 45 abut against the left side of the right ┛-shaped bag cover inner edge strip plate 101. Stretch the 4 cm of the folded-back bag cover surface piece 2 cm to the right evenly. The right square fixing plate 402 abuts against the left side of the right adjustment hole 450. At the same time, the right end of the right push plate 451 protrudes and abuts against the right side of the U-shaped card slot 481;
[0057] S5. Fasten the cover plate 2. Place the mold under the presser foot of the flat sewing machine and sew the outer opening of the bag cover along the overlapping horizontal through slots. After sewing is completed, take out the mold and lift the cover plate 2 to take out the sewn bag cover.
[0058] The transparent bottom plate 1, cover plate 2, bag cover inner pressing plate 3, bag cover interlayer pressing plate 4, bag cover surface pressing plate 5 and left folding plate 6 of the bag cover surface of the mold of the present invention are all flexibly connected, which is convenient for opening and fastening; the bag cover surface piece is 4 cm longer than the bag cover inner piece. In the method of the present invention, when sewing both sides of the bag cover, the bag cover surface piece is folded back 4 cm through the bag cover surface pressing plate 5 and the left folding plate 6 of the bag cover surface to ensure the folding size, and the size of the bag cover surface piece matches that of the bag cover inner; when sewing the outer opening of the bag cover, the folded-back 4 cm is evenly pushed to both ends and stretched flat by directly pushing the left slide plate 44 and the right slide plate 45 of the bag cover interlayer pressing plate 4, so that both ends of the bag cover surface are 1 cm longer than the net prints at both ends of the bag cover inner. In this way, it not only ensures the uniform size at both ends of the bag cover and stabilizes the product quality, but also saves a lot of time for drawing prints on the bag cover surface and inner, and improves work efficiency.
[0059] The area enclosed by the left L-shaped bag cover inner edge strip plate 105, the corner bag cover inner edge strip plate 104, the rear bag cover inner edge strip plate 103, the right ┛-shaped bag cover inner edge strip plate 101 and the right ┓-shaped bag cover inner edge strip plate 102 matches the shape of the bag cover inner piece, which is convenient for determining the placement and positioning of the bag cover inner piece; the bag cover interlayer pressing plate 4 is provided with keyhole positioning holes 52 and the top surface of the bag cover inner pressing plate 3 is provided with a bag cover interlayer positioning line 302, which is convenient for controlling the distance between the bag cover inner and the outer opening of the bag cover and the distance between the keyhole and both ends of the bag cover when placing the bag cover interlayer.
[0060] The thickness of the mold bottom plate and the cover plate of the present invention is 1.5 mm, and the thickness of the inner pressing plate 3 of the bag cover, the outer pressing plate 5 of the bag cover and the left-side folding plate 6 of the bag cover surface is a 0.5-mm transparent PVC plate. The thickness of the interlayer pressing plate 4 of the bag cover is a 0.5-mm transparent PVC plate and a fiberglass yellow board, which can clearly observe the placement of the cut pieces for adjustment. Using the mold and method of the present invention is convenient for operation, reduces processes, and saves time and effort.
Claims
1. A composite mold for making a double-layer bag lid, characterized in that, It includes a bottom plate (1), a cover plate (2) flexibly connected to the rear side edge of the bottom plate (1), a flap inner pressing plate (3) flexibly connected to the front side top surface of the bottom plate (1), a flap sandwich pressing plate (4) flexibly connected to the front side top surface of the flap inner pressing plate (3), a flap surface pressing plate (5) flexibly connected to the front side edge of the flap inner pressing plate (3), and a flap surface left folding plate (6) flexibly connected to the left front side top surface of the flap surface pressing plate (5); a lower stitching through groove and an upper stitching through groove that coincide after buckling are provided on the bottom plate (1) and the cover plate (2); a folding and stretching component is arranged in the flap sandwich pressing plate (4); A side blocking component is arranged on the bottom plate (1), the flap inner pressing plate (3) and the flap sandwich pressing plate (4); a keyhole positioning hole (47) is vertically arranged on the flap sandwich pressing plate (4), and a placing flap sandwich positioning line (302) that coincides with the midline of the keyhole positioning hole (47) is arranged on the top surface of the flap inner pressing plate (3); After the flap inner pressing plate (3), the flap sandwich pressing plate (4), the flap surface pressing plate (5) and the flap surface left folding plate (6) are buckled, they are arranged between the bottom plate (1) and the cover plate (2).
2. The composite mold for manufacturing a double-layer bag cover according to claim 1, characterized in that, The bottom plate (1) and the cover plate (2) are rectangular and have the same size after buckling; The lower stitching through groove includes a lower horizontal through groove (11) arranged at the rear side of the bottom plate (1), a lower left through groove (12) arranged at the left side of the bottom plate (1), and a lower right through groove (13) arranged at the right side of the bottom plate (1). The lower left through groove (12) and the lower right through groove (13) are parallel and obliquely inclined to the right from back to front; the rear end of the lower left through groove (12) intersects with the left end of the lower horizontal through groove (11), and the rear end of the lower right through groove (13) intersects with the right end of the lower horizontal through groove (11); After the flap inner pressing plate (3), the flap sandwich pressing plate (4), the flap surface pressing plate (5) and the flap surface left folding plate (6) are buckled: the flap inner pressing plate (3), the flap sandwich pressing plate (4), the flap surface pressing plate (5) and the flap surface left folding plate (6) are all arranged between the lower left through groove (12) and the lower right through groove (13); the left and right sides of the flap inner pressing plate (3), the flap sandwich pressing plate (4), the flap surface pressing plate (5) and the flap surface left folding plate (6) are parallel to the lower left through groove (12) and the lower right through groove (13), and the rear side edges are parallel to the lower horizontal through groove (11); the left side edges of the flap inner pressing plate (3) and the flap sandwich pressing plate (4) are flush with the right side edge of the lower left through groove (12), the rear side edges of the flap inner pressing plate (3) and the flap sandwich pressing plate (4) are flush with the lower horizontal through groove (11), and the right side edges of the flap inner pressing plate (3), the flap sandwich pressing plate (4) and the flap surface left folding plate (6) are flush with the left side edge of the lower right through groove (13); the left side of the flap surface pressing plate (5) overlaps with the right side of the flap surface left folding plate (6); The upper suture groove includes an upper horizontal groove (21) provided at the rear side of the cover plate (2), a left upper groove (22) provided at the left side of the cover plate (2), and a right upper groove (23) provided at the right side of the cover plate (2). The left upper groove (22) and the right upper groove (23) are parallel and inclined to the right from the rear to the front. The rear end of the left upper groove (22) intersects with the left end of the upper horizontal groove (21), and the rear end of the right upper groove (23) intersects with the right end of the upper horizontal groove (21). After the bottom plate (1) and the cover plate (2) are buckled: the lower horizontal groove (11) coincides with the upper horizontal groove (21), the lower left groove (12) coincides with the left upper groove (22), and the lower right groove (13) coincides with the right upper groove (23).
3. The composite mold for making a double-layer bag cover according to claim 2, characterized in that, The edge blocking assembly includes a bag inner edge blocking assembly provided on the bottom plate (1), a bag interlayer edge blocking assembly provided on the bag inner pressing plate (3), and a bag face edge blocking assembly provided on the bag interlayer pressing plate (4). The bag inner edge blocking assembly includes a rear bag inner edge blocking strip plate (103) arranged in parallel at the rear side of the lower horizontal groove (11), a right ┛-shaped bag inner edge blocking strip plate (101) and a right ┓-shaped bag inner edge blocking strip plate (102) provided on the right side of the lower right groove (13), a left L-shaped bag inner edge blocking strip plate (105) provided on the left side of the lower left groove (12), and a corner bag inner edge blocking strip plate (104) arranged in a chamfer shape at the intersection of the lower left groove (12) and the lower horizontal groove (11). The right end of the lower horizontal groove (11) is arranged between the right ┛-shaped bag inner edge blocking strip plate (101) and the right ┓-shaped bag inner edge blocking strip plate (102). The side plates of the right ┛-shaped bag inner edge blocking strip plate (101) and the right ┓-shaped bag inner edge blocking strip plate (102) are collinear and parallel to the lower right groove (13). The side plate of the left L-shaped bag inner edge blocking strip plate (105) is parallel to the lower horizontal groove (11). The top angle of the right ┓-shaped bag inner edge blocking strip plate (102) is in an inverted V shape, the bottom angle of the left L-shaped bag inner edge blocking strip plate (105) is in a V shape, and the bottom edge of the right ┛-shaped bag inner edge blocking strip plate (101) slopes downward from right to left. After the bag face pressing plate (5) and the left side folding plate (6) of the bag face are buckled with the bottom plate (1): the rear side edges of the bag face pressing plate (5) and the left side folding plate (6) of the bag face are located at the rear side of the rear bag inner edge blocking strip plate (103). The area enclosed by the left L-shaped bag inner edge blocking strip plate (105), the corner bag inner edge blocking strip plate (104), the rear bag inner edge blocking strip plate (103), the right ┓-shaped bag inner edge blocking strip plate (102), and the right ┛-shaped bag inner edge blocking strip plate (101) matches the shape of the bag inner cut piece. The bag interlayer edge blocking assembly includes the left L-shaped bag inner edge blocking strip plate (105), a bag interlayer edge blocking strip plate (301) provided at the top edge of the rear side of the bag inner pressing plate (3), and the right ┛-shaped bag inner edge blocking strip plate (101). After the bag inner pressing plate (3) is buckled: the area enclosed by the left L-shaped bag inner edge blocking strip plate (105), the bag interlayer edge blocking strip plate (301), and the right ┛-shaped bag inner edge blocking strip plate (101) matches the shape of the bag interlayer. The bag cover surface edge guard assembly includes a left L-shaped inner bag cover edge guard strip (105), a corner inner bag cover edge guard strip (104), a rear inner bag cover edge guard strip (103), a right ┛-shaped inner bag cover edge guard strip (101), and a right ┓-shaped inner bag cover edge guard strip (102), a right front side edge guard strip (491) of the bag cover surface arranged on the top surface of the right front side of the bag cover sandwich pressing plate (4), and a left front edge guard strip (492) of the bag cover surface arranged on the top surface of the left front side of the bag cover sandwich pressing plate (4). The right end of the right front side edge guard strip (491) corresponds to the end of the right ┛-shaped inner bag cover edge guard strip (101), and the left end of the left front edge guard strip (492) of the bag cover surface corresponds to the right end of the left L-shaped inner bag cover edge guard strip (105).
4. A composite mold for making a double-layer bag cover according to claim 3, characterized in that, On the top surface of the bag cover surface pressing plate (5) and 2 cm away from the left side edge of the bag cover surface pressing plate (5), a bag cover surface folding-back marking edge guard strip (501) is arranged. The bag cover surface folding-back marking edge guard strip (501) is parallel to the left side edge of the bag cover surface pressing plate (5). The left side edge of the bag cover surface pressing plate (5) is the edge guard for the bag cover surface to fold to the right. After the bag cover surface pressing plate (5) is buckled with the left folding plate (6) of the bag cover surface: the right side edge of the left folding plate (6) of the bag cover surface abuts against the left side edge of the bag cover surface folding-back marking edge guard strip (501), and the right side edge of the left folding plate (6) of the bag cover surface is the edge guard for the bag cover surface to fold back to the left.
5. The composite mold for manufacturing a double-layer bag cover according to claim 3, characterized in that, The buckled bag cover sandwich pressing plate (4) includes a backing plate (41) and an upper plate (42), and the folding-back and stretching component is arranged between the backing plate (41) and the upper plate (42). The folding-back and stretching component includes a rear limiting plate (43) and a front limiting plate (48) fixedly arranged between the backing plate (41) and the upper plate (42), and a left sliding plate (44) and a right sliding plate (45) slidably arranged on both sides of the rear limiting plate (43); the left sliding plate (44) and the right sliding plate (45) abut against both sides of the rear limiting plate (43), and a U-shaped card slot (481) is arranged on the rear side edge of the front limiting plate (48). The left side edge of the left sliding plate (44) is parallel to the side plate of the L-shaped inner bag cover edge guard strip (105) and flush with the right side edge of the lower left through slot (12), and the right side edge of the right sliding plate (45) is parallel to the side plate of the right ┛-shaped inner bag cover edge guard strip (101) and flush with the left side edge of the lower right through slot (13). A rectangular left adjustment hole (440) is provided on the left sliding plate (44), and a rectangular right adjustment hole (450) is provided on the right sliding plate (45). A left square fixing plate (401) and a right square fixing plate (402) are fixedly provided on the backing plate (41). The left square fixing plate (401) is disposed in the left adjustment hole (440) with a gap, and the right square fixing plate (402) is disposed in the right adjustment hole (450) with a gap. A rectangular opening window (46) is provided on the front side of the upper plate (42). A left push plate (441) fixed to the left sliding plate (44) is provided inside the left side of the opening window (46). The left end of the left push plate (441) protrudes forward to correspond to the left side edge of the U-shaped card slot (481). A left operation hole (442) is provided at the right end of the left push plate (441). A right push plate (451) fixed to the right sliding plate (45) is provided inside the right side of the opening window (46). The right end of the right push plate (451) protrudes forward to correspond to the right side edge of the U-shaped card slot (481). A right operation hole (452) is provided at the left end of the right push plate (451); Press the left operation hole (442) to push the left push plate (441) 1 cm to the left so that the left side edge of the left sliding plate (44) abuts against the right side of the L-shaped bag cover inner baffle strip (105). At this time, the left square fixing plate (401) abuts against the right side edge of the left adjustment hole (440). At the same time, the left end of the left push plate (441) protrudes to abut against the left side edge of the U-shaped card slot (481). Press the right operation hole (452) and push the right push plate (451) 1 cm to the right so that the right sliding plate (45) abuts against the left side of the right ┛-shaped bag cover inner baffle strip (101). The right square fixing plate (402) abuts against the left side edge of the right adjustment hole (450). At the same time, the right end of the right push plate (451) protrudes to abut against the right side edge of the U-shaped card slot (481).
6. The composite mold for making a double-layer bag cover according to claim 4, characterized in that, The cover plate (2) includes a left cover plate (201) corresponding to the left folding plate (6) after being buckled and a right cover plate (202) corresponding to the bag cover surface pressing plate (5); A left hollow (203) is provided on the left cover plate (201), and a right hollow (204) is provided on the right cover plate (202); Located on the buckling surface of the cover plate (2): An upper elevation plate strip (205) is fixed to the rear side edge of the upper horizontal through groove (21), an upper left elevation strip (206) is fixed to the left side edge of the upper left through groove (21), and an upper right elevation strip (207) is fixed to the right side edge of the upper right through groove (23); Anti-slip plate strips A (208) are provided on the buckling surfaces of the upper elevation plate strip (205), the upper left elevation strip (206) and the upper right elevation strip (207), and anti-slip plate strips B (209) are provided on the outside of the left hollow (203), the outside of the right hollow (204) and the front side of the upper horizontal through groove (21).
7. A composite mold for manufacturing a double-layer bag cover according to claim 4, characterized in that, Anti-slip strip C (106) is provided between the lower horizontal through groove (11) and the rear pocket cover inner baffle strip (103), between the lower left through groove (12) and the left L-shaped pocket cover inner baffle strip (105), between the lower right through groove (13) and the right ┛-shaped pocket cover inner baffle strip (101), and between the lower right through groove (13) and the right ┓-shaped pocket cover inner baffle strip (102); anti-slip strip D (107) is provided on the inner sides of the lower horizontal through groove (11), the lower left through groove (12) and the lower right through groove (13); anti-slip strip E (303) is provided on the two side edges of the top surface of the pocket cover inner pressing plate (3).
8. A sewing method for a double-layer bag cover, using the composite mold for making a double-layer bag cover according to any one of claims 1-7, characterized in that, The steps are as follows: S1. Place the composite mold on the workbench, lift the cover plate (2) backward, and sequentially lift the left side folding plate (6) of the pocket cover surface, the pocket cover surface pressing plate (5), the pocket cover interlayer pressing plate (4) and the pocket cover inner pressing plate (3) forward. Lay the pocket cover inner cutting piece in the area enclosed by the left L-shaped pocket cover inner baffle strip (105), the corner pocket cover inner baffle strip (104), the rear pocket cover inner baffle strip (103), the right ┓-shaped pocket cover inner baffle strip (102) and the right ┛-shaped pocket cover inner baffle strip (101); S2. Buckle and press the pocket cover inner pressing plate (3) on the upper surface of the pocket cover inner. Lay the pocket cover interlayer in the area enclosed by the left L-shaped pocket cover inner baffle strip (105), the pocket cover interlayer baffle strip (301) and the right ┛-shaped pocket cover inner baffle strip (101). Adjust to make the center line of the keyhole of the pocket cover interlayer coincide with the pocket cover interlayer positioning line (302). Buckle and press the pocket cover interlayer pressing plate (4) on the upper surface of the pocket cover interlayer, and make the keyhole of the pocket cover interlayer coincide with the keyhole positioning hole (47); S3. Lay the pocket cover surface on the pocket cover interlayer pressing plate (4). Lay the right side of the pocket cover surface in the area enclosed by the rear pocket cover inner baffle strip (103), the right ┓-shaped pocket cover inner baffle strip (102), the right ┛-shaped pocket cover inner baffle strip (101) and the right front side baffle strip (491) of the pocket cover surface. Buckle and press the pocket cover surface pressing plate (5) on the right side surface of the pocket cover surface. Fold the left side of the pocket cover surface obliquely to the right along the left side edge of the pocket cover surface pressing plate (5) and press it on the surface of the pocket cover surface pressing plate (5). Buckle and press the left side folding plate (6) of the pocket cover surface on the pocket cover surface on the surface of the left side pocket cover surface pressing plate (5). The right side edge of the left side folding plate (6) of the pocket cover surface abuts against the left side edge of the pocket cover surface return folding mark baffle strip (501). The width of the pocket cover surface pressed by the left side folding plate (6) is 2 cm. Then, fold the pocket cover surface 2 cm obliquely to the left along the right side edge of the left side folding plate (6) of the pocket cover surface. The folded pocket cover surface to the left is laid in the area enclosed by the left L-shaped pocket cover inner baffle strip (105), the corner pocket cover inner baffle strip (104) and the left front baffle strip (492) of the pocket cover surface. Manually press the folded pocket cover surface and buckle the left cover plate (201) to press on the left side of the pocket cover surface so that the left hollow (203) passes through the pressed hand position. Then, buckle the right cover plate (202) downward to press on the right side surface of the pocket cover surface. After the overall buckling, place the mold under the presser foot of the flat sewing machine and sew the two sides of the pocket cover along the coincident left through groove and right through groove; S4. After stitching is completed, take it out and place it on the workbench. Lift the left cover plate (201) and the right cover plate (202) backward. Pull out the left folding plate (6) of the bag cover surface forward from between the bag cover surface and the bag cover sandwich layer. Then lift the bag cover surface pressing plate (5) forward, slightly lift the bag cover surface, press the left operation hole (442) and push the left push plate (441) 1 cm to the left to make the left side of the left slide plate (44) abut against the right side of the L-shaped bag cover inner baffle strip plate (105). Smoothly stretch the 4 cm of the folded-back bag cover surface piece 2 cm to the left. At this time, the left square fixing plate (401) abuts against the right side of the left adjustment hole (440). At the same time, the left end of the left push plate (441) protrudes and abuts against the left side of the U-shaped card slot (481). Press the right operation hole (452) and push the right push plate (451) 1 cm to the right to make the right slide plate (45) abut against the left side of the right ┛-shaped bag cover inner baffle strip plate (101). Smoothly stretch the 4 cm of the folded-back bag cover surface piece 2 cm to the right. The right square fixing plate (402) abuts against the left side of the right adjustment hole (450). At the same time, the right end of the right push plate (451) protrudes and abuts against the right side of the U-shaped card slot (481); S5. Close the cover plate (2), place the mold under the presser foot of the flat sewing machine, sew the outer opening of the bag cover along the overlapping horizontal through groove. After sewing is completed, take out the mold, lift the cover plate (2) and take out the sewn bag cover.