Bag folding device of lower folding knife of bag opening machine

Abstract

The invention discloses a bag opening machine lower folding knife bag folding device which comprises a material fixing assembly arranged above a table plate, the material fixing assembly is provided with an outer pressing frame and a material fixing piece, a bag folding area and a material moving area are distributed on the table plate, a folding knife assembly is arranged below the material fixing assembly, and the material moving area is provided with a material pressing plate. The folding knife assembly is provided with a lower folding knife which upwards penetrates through a notch in the bag folding area and can be driven to move away from the bag folding area, a slotting knife assembly is arranged above the material fixing assembly, a material fixing window is formed between material fixing pieces, and the slotting knife assembly is provided with a mounting base capable of being driven to ascend and descend and a front slotting knife and a rear slotting knife installed on the mounting base. The outer pressing frame can be driven to abut against the material moving area downwards and move horizontally. The lower folding knife capable of moving back and forth to the bag folding area on the platen is arranged on the folding knife assembly so that the turned edge of the pocket can be folded through the lower folding knife, and the lower folding knife can be driven to move to the rear side of the platen so as to be away from the bag folding area, so that the lower folding knife can be conveniently and rapidly installed and debugged, and the bag opening use of the equipment is more convenient.

Description

Technical Field

[0001] This invention relates to the field of garment processing technology, and in particular to a bag-folding device for a bag-opening machine with a lower folding knife. Background Technology

[0002] In the garment manufacturing process, the pocket opening machine is an essential auxiliary processing machine. It is mainly used to form pockets in specific positions of the garment to facilitate carrying small items such as mobile phones and wallets. The current practice is to process the pocket opening and the pocket lip separately first, and then sew the pocket lip onto the pocket opening to complete the pocket opening.

[0003] Specifically, the garment is first placed on the outer pressure frame, and then pressed down by the small pressure frame to press the garment material onto the movable and stretchable fixed material sheet of the outer pressure frame to fix the garment material. Then, the pockets of the garment are cut, folded, shaped and sewn. Cutting means cutting a slit at the pocket (such as cutting an "H" shaped slit). Folding the pocket means using a folding knife to fold the cut pocket opening inward along the edge of the fixed material sheet to form a folded edge. The fixed material sheet is pressed upward by a clip to hold and fix the folded edge of the pocket. The folded edge of the pocket is placed and pressed tightly onto the folded edge of the pocket. Finally, the garment is sewn.

[0004] However, in the above processing, the folding knife needs to move up and down and outward each time to fold the edge of the bag. Therefore, the driving and folding action of the folding knife is relatively complicated, which increases the difficulty of installation and debugging of the folding knife. Especially for the bottom folding knife bag opening machine, the bottom folding knife located under the table is more inconvenient to install and maintain, which can easily affect the normal processing, use and maintenance of the bag. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bag-folding device for a bag-opening machine with a lower folding knife.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bag-folding device for a bag-opening machine includes a material-fixing assembly disposed above a platform. The material-fixing assembly has an outer pressure frame and material-fixing pieces distributed opposite each other on the outer pressure frame. A bag-folding area and a material-transferring area are distributed on the platform. The material-fixing assembly can be moved to above the bag-folding area or the material-transferring area. A folding knife assembly is disposed below the material-fixing assembly. The folding knife assembly has a lower folding knife that penetrates upward through a notch in the bag-folding area and can be driven to move away from the bag-folding area. An inserting knife assembly is disposed above the material-fixing assembly and is vertically opposite to the folding knife assembly. A material-fixing window is formed between the material-fixing pieces. The inserting knife assembly has a mounting base that can be driven to rise and fall, and front and rear inserting knives mounted on the mounting base and able to pass downward through the material-fixing window. The outer pressure frame can be driven to press downward against the material-transferring area and move horizontally.

[0008] Preferably, the folding knife assembly includes a mounting plate fixed to the platform, and a folding knife seat for mounting the lower folding knife is slidably mounted on the mounting plate. The lower folding knife can be moved to the folding bag area via the folding knife seat and folded back and forth under drive.

[0009] Preferably, the folding knife holder is equipped with a folding knife drive motor and a folding knife lead screw connected to the drive end of the folding knife drive motor. A push block for driving the lower folding knife to slide back and forth is connected to the folding knife lead screw.

[0010] Preferably, the mounting base is provided with insert plates distributed in the front and back for fixing the front and rear inserts. The insert plates are equipped with telescopic rails extending along the width direction of the front and rear inserts, and telescopic inserts are provided on the sides of the front and rear inserts through the telescopic rails for telescopic sliding adjustment.

[0011] Preferably, the telescopic insert is distributed on both sides of the front and rear inserts, and the telescopic insert is provided with an extension piece that fits into the front and rear inserts.

[0012] Preferably, the mounting base is equipped with a slide rail that extends left and right and is slidably connected to the slide plate. The slide plate has inclined grooves. The blade plate is fixed with a guide rod connected to the inclined groove. The slide plate is driven by the inclined groove and the guide rod to adjust and slide the blade plate back and forth.

[0013] Preferably, a slide block is slidably mounted on the outer pressure frame, and a clamping piece corresponding to the upper and lower parts of the fixed material sheet is hinged on the slide block. The clamping piece has abutting teeth that can be driven upward to abut against the fixed material sheet.

[0014] Preferably, the clamping piece is fixedly installed on the hinge plate, the hinge plate is hinged to the slide via a pin shaft, a clamping cylinder is rotatably installed on the slide, and the connector on the drive end of the clamping cylinder is rotatably connected to the hinge plate.

[0015] Preferably, the material setting component includes a small pressure frame located above the outer pressure frame, and the small pressure frame is pressed down onto the outer pressure frame by a lifting plate.

[0016] Preferably, the platform is provided with a sewing assembly and a crossbeam, the crossbeam is equipped with a cutting assembly, and the material positioning assembly can be moved via the crossbeam to the cutting assembly, the folding knife assembly, and the sewing assembly.

[0017] The beneficial effects of this invention are:

[0018] 1. A lower folding knife is installed on the folding knife assembly that can move forward and backward to the folding bag area on the table. The lower folding knife can fold the edge of the bag, and it can also be driven to move to the rear of the table away from the folding bag area. This makes it easier to install and adjust the lower folding knife, making the opening and use of the equipment more convenient.

[0019] 2. By setting up front and rear inserts that can be raised and lowered under drive, the pocket flap can be folded downwards. This works in conjunction with a lower folding knife that only moves forward and backward to fold the pocket flap outwards. This design simplifies the folding action of the lower folding knife and reduces the difficulty of its installation and debugging. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a partial structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the material feeding assembly of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the external pressure frame of the present invention;

[0024] Figure 5 This is a partial structural diagram of the external pressure frame of the present invention. Figure 1 ;

[0025] Figure 6 This is a partial structural diagram of the external pressure frame of the present invention. Figure 2 ;

[0026] Figure 7 This is a schematic diagram of the folding knife assembly of the present invention. Figure 1 ;

[0027] Figure 8 This is a schematic diagram of the folding knife assembly of the present invention. Figure 2 ;

[0028] Figure 9 This is a schematic diagram of the inserter assembly of the present invention;

[0029] Figure 10 This is a partial structural schematic diagram of the inserter assembly of the present invention;

[0030] Figure 11 This is a schematic diagram illustrating the cooperation between the front and rear insert blades and the telescopic insert blade of the present invention.

[0031] In the diagram: Table 1, Folding Bag Area 11, Material Transfer Area 12, Crossbeam 13, Cutting Assembly 14, Sewing Assembly 15, Material Setting Assembly 2, Outer Pressure Frame 21, Material Setting Plate 211, Material Setting Plate Cylinder 212, Slide 22, Clamping Plate Cylinder 23, Clamping Plate 24, Abutting Gear 241, Hinge Plate 242, Pin Shaft 243, Material Clamping Cylinder 25, Connector 251, Small Pressure Frame 3, Lifting Plate 31, Folding Knife Assembly 4, Mounting Plate 41, Folding Knife Adjustment Motor 411, Transmission Belt 412, Folding Knife Holder 42, Folding Knife Drive 421 drive motor, 422 folding knife lead screw, 423 push block, 43 lower folding knife, 5 insert knife assembly, 51 mounting base, 511 insert knife drive motor, 512 synchronous belt, 513 insert knife lead screw, 52 slider, 521 connecting rod, 522 slide groove, 53 insert knife adjustment motor, 531 transmission rod, 54 slide plate, 541 slide rail, 542 inclined groove, 55 insert knife plate, 551 adjusting rail, 552 guide rod, 56 front and rear insert knives, 57 telescopic rail, 58 adjusting plate, 59 telescopic insert knife, 591 extension plate. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0033] In the description of this specification, the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0034] like Figures 1 to 11 As shown, a bag-opening machine with a lower folding knife and a bag-folding device includes a material-fixing component 2 disposed above a table 1. The table 1 is provided with a sewing component 15 and a crossbeam 13. The sewing component 15 includes a sewing machine head for sewing and processing the bag. The crossbeam 13 is equipped with a cutting component 14. In this embodiment, the cutting component 14 uses laser cutting to cut the garment fabric.

[0035] Below the material fixing component 2 is a folding knife component 4. The material fixing component 2 can be moved via the crossbeam 13 to the cutting component 14, the folding knife component 4, and the sewing component 15. That is, the material fixing component 2 can move up and down, forward and backward, and left and right on the crossbeam 13 so as to move to the cutting component 14, the folding knife component 4, and the sewing component 15 for corresponding processing.

[0036] The material fixing assembly 2 has an outer pressure frame 21 and material fixing pieces 211 distributed front and rear opposite to each other on the outer pressure frame 21. The two material fixing pieces 211 can be driven to extend and retract relative to each other, and a material fixing window is formed between the material fixing pieces 211. Specifically, a material fixing piece cylinder 212 for driving the material fixing pieces 211 to extend and retract is installed on the outer pressure frame 21. The material fixing pieces 211 are connected to the driving end of the material fixing piece cylinder 212 so that the two material fixing pieces 211 can be moved back and forth relative to each other through the material fixing piece cylinder 212.

[0037] The garment fabric to be opened and processed is placed on the outer pressure frame 21 and moved to the cutting component 14 so that the garment fabric located in the material setting window can be cut and processed.

[0038] The material fixing component 2 includes a small pressure frame 3 located above the outer pressure frame 21. The small pressure frame 3 is pressed down on the outer pressure frame 21 by the lifting plate 3. That is, the lifting plate 31 can be driven to move up and down and can drive the small pressure frame 3 on it to press down the clothing fabric on the outer pressure frame 21 to press down and fix the clothing fabric.

[0039] The table 1 has a folding bag area 11 and a material transfer area 12 distributed on it. The material transfer area 12 and the folding bag area 11 are distributed on the table 1 in front and behind. The material transfer area 12 is laterally opposite to the sewing component 15. The material fixing component 2 can be moved back and forth to be above the folding bag area 11 or the material transfer area 12.

[0040] The folding knife assembly 4 has a lower folding knife 43 that extends upward through a notch in the folding pocket area 11 and can be driven to move away from the folding pocket area 11. When the garment fabric on the material setting assembly 2 needs to be folded, the lower folding knife 43 can move forward to the folding pocket area 11, and at this time, the lower folding knife 43 corresponds vertically to the material setting window.

[0041] Specifically, the folding knife assembly 4 includes a mounting plate 41 fixed on the platform 1. The mounting plate 41 is installed below the platform 1 to avoid interfering with the displacement of the material fixing assembly 2. A folding knife seat 42 for mounting a lower folding knife 43 is slidably mounted on the mounting plate 41. The lower folding knife 43 is mounted on the folding knife seat 42. A folding knife adjusting motor 411 is fixed on the mounting plate 41. A transmission belt 412 is connected to the drive end of the folding knife adjusting motor 411. The folding knife adjusting motor 411 drives the folding knife seat 42 to slide back and forth on the mounting plate 41 through the transmission belt 412.

[0042] Furthermore, the lower folding blade 43 on the folding blade holder 42 can be driven to move to the rear side of the platform 1 away from the bag folding area 11, so as to facilitate the convenient installation and debugging of the lower folding blade 43, making the opening and use of the equipment more convenient.

[0043] The lower folding blade 43 can be moved to the folding pocket area 11 via the folding blade holder 42 and driven to fold back and forth. Specifically, there are two lower folding blades 43, which are distributed in a front-to-back orientation. The folding blade holder 42 is equipped with a folding blade drive motor 421 and a folding blade screw 422 that is connected to the drive end of the folding blade drive motor 421. The folding blade drive motor 421 is used to drive the folding blade screw 422 to rotate in both directions. A push block 423 is connected to the folding blade screw 422 to drive the lower folding blade 43 to slide back and forth. The lower end of the push block 423 is slidably mounted on the folding blade holder 422 so that the corresponding lower folding blade 43 can be driven to move back and forth relative to each other through the push block 423, thereby realizing the outward folding pocket edge action.

[0044] Furthermore, a blade insertion assembly 5 is provided above the material fixing assembly 2, which is vertically opposite to the folding blade assembly 4. The blade insertion assembly 5 has a mounting base 51 that can be driven to rise and fall, and front and rear blades 56 that are mounted on the mounting base 51 and can pass downward through the material fixing window. There are two front and rear blades 56, which are distributed in a front-to-back manner.

[0045] After the garment fabric is cut and processed, the front and rear insert blades 56 can move downward through the mounting base 51 and through the fixed material window to fold the pocket edge downward. This is done in conjunction with the lower folding blade 43, which moves only forward and backward to fold the pocket edge outward, thus realizing the pocket edge folding operation. Through the above design, the folding action of the lower folding blade 43 is simplified. Compared with the existing method that requires lifting and moving forward and backward to fold, the installation and debugging difficulty of the lower folding blade 43 is reduced, which improves the convenience of the equipment for folding pockets.

[0046] Furthermore, the mounting base 51 is provided with a blade plate 55 arranged in a front-to-back manner for fixing the front and rear blades 56. The front and rear blades 56 are installed at the lower end of the blade plate 55. The blade plate 55 is provided with a telescopic rail 57 extending along the width direction of the front and rear blades 56. The telescopic rail 57 is horizontally fixed on the blade plate 55. The sides of the front and rear blades 56 are provided with telescopic blades 59 that are adjusted by telescopic sliding through the telescopic rail 57. The telescopic blades 59 are arranged in a straight line with the front and rear blades 56.

[0047] The telescopic insert 59 is distributed on both sides of the front and rear inserts 56. The front and rear inserts 56 and the telescopic insert 59 cooperate with each other to fold the flap of the pocket downward. The telescopic insert 59 can slide along the telescopic rail 57 to adjust the overall length of the insert, thereby meeting the processing needs of pockets of different lengths and sizes.

[0048] Specifically, the mounting base 51 has a left-right extending groove 522 and a slider 52 that can be driven to slide along the groove 522. The mounting base 51 has a blade drive motor 511, which can be a servo motor. The blade drive motor 511 is connected to the slider 52 via a synchronous belt 512 and a blade screw 513, and drives the slider 52 to slide back and forth along the groove 522. That is, the synchronous belt 512 drives the blade screw 513 to rotate in both directions through the blade drive motor 511, so as to drive the slider 52 to slide left and right.

[0049] The slider 52 is connected to the adjusting plate 58 of the telescopic insert 59 via the connecting rod 521. The telescopic insert 59 is installed at the lower end of the adjusting plate 58. The connecting rod 521 is fixed to the slider 52 and is connected to the two telescopic inserts 59 distributed in front and behind. The sliding groove 522 is parallel to the telescopic rail 57. When the slider 52 is driven to slide along the sliding groove 522, the slider 52 drives the two telescopic inserts 59 distributed in front and behind to slide synchronously via the connecting rod 521, thereby adjusting the left and right relative positions of the front and rear inserts 56.

[0050] In this embodiment, a telescopic insert 59 is provided on the side of the front and rear inserts 56. The telescopic insert 59 can be driven to slide and cooperate with the front and rear inserts 56 to adjust the overall length of the insert, thereby adapting to the processing needs of pockets of different lengths and sizes. Compared with the existing method that requires disassembly and replacement, the adjustment and use of the insert in this embodiment is simpler and more efficient, and it also improves the processing efficiency of pockets.

[0051] The telescopic insert 59 is provided with an extension piece 591 that fits into the front and rear inserts 56. When the telescopic insert 59 slides, the telescopic insert 59 can always fit into the front and rear inserts 56 through the extension piece 591, thereby allowing the front and rear inserts 56 and the telescopic insert 59 to have a larger contact area and fold the pocket edge downwards to improve the pocket folding effect.

[0052] The mounting base 51 is equipped with a slide rail 541 that extends left and right and is slidably connected to the slide plate 54. The slide plate 54 can slide left and right along the slide rail 541. The mounting base 51 is equipped with a blade adjustment motor 53, which can be a servo motor. The blade adjustment motor 53 is connected to the slide plate 54 via a transmission rod 531 and can drive the slide plate 54 to move left and right. That is, the transmission rod 531 is driven to rotate forward and backward by the blade adjustment motor 53 and drives the slide plate 54 to move left and right through the thread on it (refer to the screw drive structure for details).

[0053] The mounting base 51 is equipped with an adjustment rail 551 that extends forward and backward. The insert plate 55 is slidably mounted on the adjustment rail 551. The slide plate 54 is provided with inclined grooves 542. The insert plate 55 is fixed with a guide rod 552 connected to the inclined groove 542.

[0054] The slide plate 54 drives the blade plate 55 to slide back and forth via the inclined groove 542 and the guide rod 552. When the slide plate 54 slides left and right, the slide plate 54 drives the guide rod 552 and the blade plate 55 to adjust their forward and backward displacement via the inclined groove 542, thereby adjusting the relative position of the front and rear blades 56 on the two blade plates 55.

[0055] In this embodiment, two front and rear inserts 56 are arranged opposite to each other on the mounting base 51. The distance between the two front and rear inserts 56 is electrically adjusted to meet the bag folding processing requirements of pockets of different widths. Compared with the existing method that requires disassembly and adjustment, the electrical adjustment method of the inserts in this embodiment is simpler and more efficient.

[0056] After the pocket fold is completed, two slide blocks 22 are slidably installed on the outer pressure frame 21. The slide blocks 22 are distributed opposite each other on the outer pressure frame 21. Clamping pieces 24 corresponding to the fixed material piece 211 are hinged on the slide blocks 22. The clamping pieces 24 have abutting teeth 241 that can be driven upward to abut against the fixed material piece 211. In the process of pressing and clamping the pocket fold upward, the abutting teeth 241 of the clamping pieces 24 can deform to press against the fixed material piece 211. That is, the abutting teeth 241 can deform to more stably press and clamp the pocket fold, thereby improving the fixing effect of the pocket fold and ensuring the stability of the pocket during subsequent transfer.

[0057] Specifically, the clamping piece 24 is fixedly installed on the hinge plate 242, the hinge plate 242 is hinged to the slide block 22 via the pin shaft 243, the clamping piece 24 can swing up and down via the pin shaft 243, and a clamping cylinder 25 is rotatably installed on the slide block 22. The connector 251 on the drive end of the clamping cylinder 25 is rotatably connected to the hinge plate 242, so that the clamping cylinder 25 can drive the abutment tooth 241 to press upward or move downward away from the fixed piece 211.

[0058] Furthermore, a clamping cylinder 23 is installed on the outer pressure frame 21. The driving end of the clamping cylinder 23 is connected to the slide 22 and is used to drive the slide 22 to move back and forth. That is, the clamping cylinder 23 can drive the clamping piece 24 away from the fixed piece 211 through the slide 22 and the hinge plate 242 to avoid the clamping piece 24 interfering with the folding of the pocket edge. When the clamping piece 24 is needed to clamp and fix the pocket edge, the clamping piece 24 can be driven by the clamping cylinder 23 to move to below the fixed piece 211, and the clamping cylinder 25 drives the abutment tooth 241 to press the fixed piece 211 upward.

[0059] Furthermore, after the pocket folding is clamped, the outer pressure frame 21 can move from above the folding pocket area 11 to above the transfer area 12. At this time, the outer pressure frame 21 can be driven downward to press against the transfer area 12 and move horizontally. Since the transfer area 12 at the table 1 in this embodiment does not need to be opened with a slot for the folding knife to pass through and fold the pocket folding edge, the transfer area 12 on the table 1 can be made flatter. When the outer pressure frame 21 presses down on the pocket lip and other fabrics and transfers them to the sewing assembly 15 for sewing, the fabric can be transferred more reliably and stably (the existing fabric transfer will be affected by the slot on the table 1 during transfer), which improves the effect of pocket sewing.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A bag-folding device for a bag-opening machine, comprising a material-fixing assembly (2) disposed above a table (1), characterized in that: The material fixing component (2) has an outer pressure frame (21) and material fixing pieces (211) distributed opposite to each other on the outer pressure frame (21). The platform (1) has a bag folding area (11) and a material transfer area (12). The material fixing component (2) can be moved to above the bag folding area (11) or the material transfer area (12). A folding knife component (4) is provided below the material fixing component (2). The folding knife component (4) has an upward notch that penetrates the bag folding area (11) and can be moved far by a drive. The lower folding knife (43) of the folding bag area (11) is provided above the material fixing component (2) and the inserting knife component (5) is vertically opposite to the folding knife component (4). The material fixing pieces (211) form a material fixing window. The inserting knife component (5) has a mounting base (51) that can be driven to rise and fall, and front and rear inserting knives (56) that are mounted on the mounting base (51) and can pass downward through the material fixing window. The outer pressure frame (21) can be driven to press downward against the material transfer area (12) and move horizontally.

2. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 1, characterized in that: The folding knife assembly (4) includes a mounting plate (41) fixed on the platform (1). A folding knife seat (42) for mounting a lower folding knife (43) is slidably mounted on the mounting plate (41). The lower folding knife (43) can be displaced to the folding bag area (11) via the folding knife seat (42) and folded forward and backward under drive.

3. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 2, characterized in that: The folding knife holder (42) is equipped with a folding knife drive motor (421) and a folding knife screw (422) connected to the drive end of the folding knife drive motor (421). A pusher (423) for driving the lower folding knife (43) to slide back and forth is connected to the folding knife screw (422).

4. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 1, characterized in that: The mounting base (51) is provided with insert plates (55) arranged in a front-to-back manner for fixing the front and rear inserts (56). The insert plates (55) are provided with telescopic rails (57) extending along the width direction of the front and rear inserts (56). The sides of the front and rear inserts (56) are provided with telescopic inserts (59) that are adjusted by telescopic sliding via the telescopic rails (57).

5. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 4, characterized in that: The telescopic insert (59) is distributed on both sides of the front and rear inserts (56), and the telescopic insert (59) is provided with an extension piece (591) that fits into the front and rear inserts (56).

6. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 4, characterized in that: The mounting base (51) is equipped with a slide rail (541) that extends to the left and right and is slidably connected to the slide plate (54). The slide plate (54) is provided with inclined grooves (542). The insert plate (55) is fixed with a guide rod (552) connected to the inclined groove (542). The slide plate (54) drives the insert plate (55) to slide back and forth via the inclined groove (542) and the guide rod (552).

7. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 1, characterized in that: The outer pressure frame (21) is slidably mounted with a slide block (22), and the slide block (22) is hinged with a clamping piece (24) corresponding to the upper and lower parts of the fixed material piece (211). The clamping piece (24) has abutting teeth (241) that can be driven upward to abut against the fixed material piece (211).

8. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 7, characterized in that: The clamping piece (24) is fixedly installed on the hinge plate (242), the hinge plate (242) is hinged to the slide (22) via the pin shaft (243), the slide (22) is rotatably installed with a clamping cylinder (25), and the connector (251) on the drive end of the clamping cylinder (25) is rotatably connected to the hinge plate (242).

9. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 1, characterized in that: The material fixing component (2) includes a small pressure frame (3) located above the outer pressure frame (21), and the small pressure frame (3) is pressed down on the outer pressure frame (21) by the lifting plate (31).

10. The bag-folding device for a bag-opening machine with a lower folding knife as described in claim 1, characterized in that: The platform (1) is provided with a sewing assembly (15) and a crossbeam (13). A cutting assembly (14) is installed on the crossbeam (13). The material setting assembly (2) can be moved to the cutting assembly (14), the folding knife assembly (4), and the sewing assembly (15) via the crossbeam (13).

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