Cloth folding device and bag opening machine

Abstract

The utility model provides a cloth folding device and a pocket opening machine, and belongs to the technical field of sewing equipment. The cloth folding device comprises a base, a front slotting tool, a rear slotting tool, a left slotting tool and a right slotting tool are arranged on the base, the front slotting tool comprises a first main plate body, the first main plate body is provided with a first turnup edge, the rear slotting tool comprises a second main plate body, the second main plate body is provided with a second turnup edge, the left slotting tool comprises a third main plate body, the third main plate body is provided with a third turnup edge, and the right slotting tool comprises a fourth main plate body. The first main plate body is provided with a first flanging, the second main plate body is provided with a second flanging, the fourth main plate body is provided with a fourth flanging, one end and the other end of the first flanging are provided with a first protruding edge and a second protruding edge respectively, one end and the other end of the second flanging are provided with a third protruding edge and a fourth protruding edge respectively, and after the front slotting tool and the rear slotting tool are close to each other, the first protruding edge and the third protruding edge form a first containing groove capable of containing the third flanging. The second convex edge and the fourth convex edge form a second containing groove capable of containing the fourth turned edge. The four slotting tools of the cloth folding device can perform cloth folding action at the same time and do not interfere with one another, the cloth folding steps are simplified, and the working efficiency is well improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewing equipment technical field relates to a cloth folding device and open bag machine. BACKGROUND

[0002] In the garment production process, often need to sew pocket, the processing process of pocket, need to cut the outlet pocket cloth first, then the cloth folding mechanism folds pocket cloth, then the sewing mechanism sews pocket cloth. The working principle of the cloth folding mechanism can refer to the folding bag mechanism of the open bag machine disclosed in application No. 202220630108.9.

[0003] In the prior art, when the cloth folding mechanism (device) folds cloth, the front and rear knives need to move reversely to a certain distance, then the left and right knives move towards each other between the front and rear knives, after the left and right knives complete the cloth folding action, the left and right knives move reversely and exit, and the front and rear knives move towards each other again to complete the cloth folding action.

[0004] The cloth folding mechanism of the prior art has the disadvantages of complicated folding steps and low working efficiency. SUMMARY

[0005] The utility model provides a cloth folding device for solving the above problems in the prior art, and the technical problem to be solved by the utility model is how to simplify the cloth folding steps.

[0006] The purpose of the utility model can be achieved by the following technical schemes:

[0007] A cloth folding device, the cloth folding device comprises a base, the base is provided with movable front, rear, left and right knives, the front knife comprises a main plate body one, the main plate body one has a flange one, the rear knife comprises a main plate body two, the main plate body two has a flange two, the left knife comprises a main plate body three, the main plate body three has a flange three, the right knife comprises a main plate body four, the main plate body four has a flange four, characterized in that one end and the other end of the flange one are respectively provided with a convex edge one and a convex edge two, one end and the other end of the flange two are respectively provided with a convex edge three and a convex edge four, when the front and rear knives are close to each other, the convex edge one and the convex edge three form a containing groove one capable of containing the flange three, and the convex edge two and the convex edge four form a containing groove two capable of containing the flange four.

[0008] The working principle is that in the cloth folding device, the movable front, rear, left and right knives are used for folding pocket cloth, the four knives can be driven by one driving mechanism, or the front and rear knives are driven by one driving mechanism, and the left and right knives are driven by another driving mechanism.

[0009] When the front and rear inserting knives move towards each other to fold the cloth, the left and rear inserting knives move towards each other to fold the cloth, and after the front and rear inserting knives move towards each other, the convex edge one and the convex edge three form the accommodating groove one, the convex edge two and the convex edge four form the accommodating groove two, the flange three of the left inserting knife can extend into the accommodating groove one, the main plate body three of the left inserting knife is located in the space above the convex edge one and the convex edge three, the flange four of the right inserting knife can extend into the accommodating groove two, and the main plate body four of the right inserting knife is located in the space above the convex edge two and the convex edge four. Therefore, the four inserting knives can simultaneously perform the folding action without interference, and it is not necessary to move the front and rear inserting knives in the opposite direction, then move the left and rear inserting knives towards each other to fold the cloth, and after the left and rear inserting knives move out, the front and rear inserting knives move towards each other to fold the cloth. The folding step is simplified, and the work efficiency is improved.

[0010] In the above-mentioned cloth folding device, the convex edge one has an inclined surface one, the convex edge three has an inclined surface two, and when the front and rear inserting knives move towards each other, the inclined surface one and the inclined surface two are oppositely arranged and form the accommodating groove one, the width of the accommodating groove one gradually increases from inside to outside, and the shape of the flange three is adapted to the shape of the accommodating groove one.

[0011] The accommodating groove one is a dovetail groove with a large outer diameter and a small inner diameter, the shape of the flange three is adapted to the shape of the accommodating groove one, and after the front and rear inserting knives move towards each other, the flange three of the left inserting knife extends into the accommodating groove one, and the flange three, the convex edge one and the convex edge three can better fold and form the cloth.

[0012] In the above-mentioned cloth folding device, the convex edge one has a notch one, the convex edge three has a notch two, and when the front and rear inserting knives move towards each other, the notch one and the notch two form the accommodation groove one, and the accommodation groove one is in communication with the accommodating groove one.

[0013] The accommodation groove one is used to accommodate the bottom of the main plate body three of the left inserting knife, and the accommodating groove one is used to accommodate the flange three, which can better avoid interference.

[0014] In the above-mentioned cloth folding device, the convex edge two has an inclined surface three, the convex edge four has an inclined surface four, and when the front and rear inserting knives move towards each other, the inclined surface three and the inclined surface four are oppositely arranged and form the accommodating groove two, the width of the accommodating groove two gradually increases from inside to outside, and the shape of the flange four is adapted to the shape of the accommodating groove two.

[0015] The accommodating groove two is a dovetail groove with a large outer diameter and a small inner diameter, the shape of the flange four is adapted to the shape of the accommodating groove two, and after the front and rear inserting knives move towards each other, the flange four of the right inserting knife extends into the accommodating groove two, and the flange four, the convex edge two and the convex edge four can better fold and form the cloth.

[0016] In the cloth folding device, the convex edge two has a notch three, the convex edge four has a notch four, the notch three and the notch four form a clearance groove two when the front and rear inserts are closed, and the clearance groove two is communicated with the accommodating groove two.

[0017] The clearance groove two is used for accommodating the bottom of the main plate body four of the right insert, and the accommodating groove two is used for accommodating the flange four. This structure can better avoid interference.

[0018] In the cloth folding device, the base is provided with a finger air cylinder one, the finger air cylinder one has two clamping jaws one, each clamping jaw one is respectively provided with a connecting rod one and a connecting rod two, the connecting rod one and the connecting rod two are movably connected to the base, the left insert and the right insert are respectively installed on the connecting rod one and the connecting rod two, the base is further provided with a finger air cylinder two, the finger air cylinder two has two clamping jaws two, each clamping jaw two is respectively provided with the front insert and the rear insert.

[0019] Under the drive of the finger air cylinder one, the two clamping jaws one can move towards each other or move in the opposite direction, and the two clamping jaws one drive the left insert and the right insert to move towards each other or move away from each other through the connecting rod one and the connecting rod two. Under the drive of the finger air cylinder two, the two clamping jaws two can move towards each other or move in the opposite direction, and the two clamping jaws two drive the front insert and the rear insert to move towards each other or move away from each other.

[0020] The cloth folding device can drive the left insert and the right insert to move at the same time by using one finger air cylinder one, so that the two inserts move towards each other or move away from each other. The front insert and the rear insert can be driven to move at the same time by using one finger air cylinder two, so that the two inserts move towards each other or move away from each other. Only two air cylinders are used to drive four inserts to move, and the folding of the pocket cloth is completed in the case of simplifying the structure.

[0021] In the cloth folding device, the bottom of the base is provided with a guide rail one, each clamping jaw two is respectively provided with a connecting block one and a connecting block two, the front insert and the rear insert are respectively installed on the connecting block one and the connecting block two, and the connecting block one and the connecting block two are respectively slidably connected to the guide rail one.

[0022] The front insert is installed on one clamping jaw two through the connecting block one, and the rear insert is installed on the other clamping jaw two through the connecting block two. The guide rail one plays a guiding role on the connecting block one and the connecting block two, and improves the stability of the front insert and the rear insert during movement.

[0023] As an embodiment, the connecting block one and the connecting block two are respectively provided with a sliding block one, and the sliding block one is slidably connected to the guide rail one, that is, the connecting block one and the connecting block two are slidably connected to the guide rail one through the sliding block one.

[0024] In the above-mentioned cloth folding device, the bottom of the base is provided with guide rails two and three, the bottom of the connecting rod one and two is respectively provided with connecting blocks three and four, the bottom of the connecting blocks three and four is respectively provided with the left and right inserting knives, and the connecting blocks three and four are respectively slidably connected to the guide rails two and three.

[0025] The guide rails two and three respectively guide the connecting blocks three and four, thereby improving the stability of the connecting rod one and two when moving and improving the stability of the left and right inserting knives when moving.

[0026] As an embodiment, the connecting block three is slidably connected to the guide rail two through the sliding block one, and the connecting block four is slidably connected to the guide rail three through the sliding block one.

[0027] In the above-mentioned cloth folding device, the bottom of the base is provided with a cylinder, the piston rod of the cylinder is provided with a sliding block seat, four bosses are distributed in the circumferential direction of the sliding block seat, the base is movably connected with a connecting rod one, a connecting rod two, a connecting block one and a connecting block two, the left and right inserting knives are respectively installed on the connecting rod one and two, the front and rear inserting knives are respectively installed on the connecting block one and two, the connecting rod one, the connecting rod two, the connecting block one and the connecting block two are respectively provided with sliding blocks two, the sliding blocks two are respectively provided with installation grooves, the installation grooves are provided with inclined guide surfaces, the outer sides of the bosses are respectively provided with inclined guide blocks, and the guide blocks are slidably connected in the corresponding installation grooves and abut against the guide surfaces of the installation grooves.

[0028] Limit flanges are arranged on the side walls of the installation grooves, which are used for preventing the guide blocks from falling out of the installation grooves. When the piston rod of the cylinder is retracted, the piston rod drives the sliding block seat to move downward, the sliding block seat drives the front and rear inserting knives and the left and right inserting knives to move close to each other through the bosses, and the cloth folding action is completed. When the piston rod of the cylinder is extended, the piston rod drives the sliding block seat to move upward, and the sliding block seat drives the front and rear inserting knives and the left and right inserting knives to move away from each other through the bosses, so that the four inserting knives are reset.

[0029] The structure can drive the four inserting knives to move through only one cylinder, further simplifies the structure, and can well complete the cloth folding process.

[0030] The utility model also provides a bag opening machine, the bag opening machine includes any one of the above-mentioned cloth folding device.

[0031] Compared with the prior art, the utility model has the following advantages:

[0032] 1. The four inserting knives of the cloth folding device can simultaneously perform the cloth folding action and do not interfere with each other, thereby simplifying the cloth folding steps and improving the work efficiency.

[0033] 2. The folding device can drive four inserts to move by using only two air cylinders, and can complete the folding of the pocket fabric in the case of simplified structure; or can drive four inserts to move by using only one air cylinder, further simplifies the structure, and can well complete the folding process. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic diagram of the folding device in embodiment one;

[0035] Figure 2 is a structural schematic diagram of the left insert and the right insert;

[0036] Figure 3 is a schematic diagram of the front insert and the rear insert after being closed;

[0037] Figure 4 is an enlarged view of A in Figure 3 ;

[0038] Figure 5 is an enlarged view of B in Figure 3 ;

[0039] Figure 6 is a structural schematic diagram of the folding device in embodiment two Figure 1 ;

[0040] Figure 7 is a structural schematic diagram of the folding device in embodiment two Figure 2 .

[0041] In the figure: 1 base, 2 front insert, 3 rear insert, 4 left insert, 5 right insert, 6 main plate body one, 7 flange one, 8 main plate body two, 9 flange two, 10 main plate body three, 11 flange three, 12 main plate body four, 13 flange four, 14 convex edge one, 15 convex edge two, 16 convex edge three, 17 convex edge four, 18 accommodating groove one, 19 accommodating groove two, 20 inclined surface one, 21 inclined surface two, 22 notch one, 23 notch two, 24 accommodation slot one, 25 inclined surface three, 26 inclined surface four, 27 notch three, 28 notch four, 29 accommodation slot two, 30 finger air cylinder one, 31 clamping jaw one, 32 connecting rod one, 33 connecting rod two, 34 finger air cylinder two, 35 clamping jaw two, 36 guide rail one, 37 connecting block one, 38 connecting block two, 39 guide rail two, 40 guide rail three, 41 connecting block three, 42 connecting block four, 43 sliding block one, 44 air cylinder, 45 sliding block seat, 46 boss, 47 sliding block two, 48 mounting groove, 49 guide surface, 50 guide block. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present application, and the technical solutions of the present application are further described in combination with the drawings, but the present application is not limited to these embodiments.

[0043] Embodiment one

[0044] As Figures 1-3 shown, the folding device comprises a base 1, the base 1 is provided with movable front knife 2, rear knife 3, left knife 4 and right knife 5, the front knife 2 comprises main plate body one 6, the main plate body one 6 has a flange one 7, the rear knife 3 comprises main plate body two 8, the main plate body two 8 has a flange two 9, the left knife 4 comprises main plate body three 10, the main plate body three 10 has a flange three 11, the right knife 5 comprises main plate body four 12, the main plate body four 12 has a flange four 13, one end and the other end of the flange one 7 are respectively provided with convex edge one 14 and convex edge two 15, one end and the other end of the flange two 9 are respectively provided with convex edge three 16 and convex edge four 17, when the front knife 2 and the rear knife 3 are closed, the convex edge one 14 and the convex edge three 16 form a containing groove one 18 capable of containing the flange three 11, the convex edge two 15 and the convex edge four 17 form a containing groove two 19 capable of containing the flange four 13.

[0045] In the folding device, the movable front knife 2, the rear knife 3, the left knife 4 and the right knife 5 are used for folding pocket cloth, the four knives can be driven by one driving mechanism, or the front knife 2 and the rear knife 3 are driven by one driving mechanism, and the left knife 4 and the right knife 5 are driven by another driving mechanism.

[0046] When folding, the front knife 2 and the rear knife 3 move towards each other to fold, at the same time, the left knife 4 and the rear knife 3 move towards each other to fold, after the front knife 2 and the rear knife 3 are closed, the convex edge one 14 and the convex edge three 16 form the containing groove one 18, the convex edge two 15 and the convex edge four 17 form the containing groove two 19, the flange three 11 of the left knife 4 can extend into the containing groove one 18, the main plate body three 10 of the left knife 4 is located in the space above the convex edge one 14 and the convex edge three 16, the flange four 13 of the right knife 5 can extend into the containing groove two 19, and the main plate body four 12 of the right knife 5 is located in the space above the convex edge two 15 and the convex edge four 17. Therefore, the four knives can simultaneously perform folding action without interfering with each other, which simplifies the folding steps and greatly improves the work efficiency.

[0047] As Figure 3 and 4 shown, in the embodiment, the convex edge one 14 has an inclined slope one 20, the convex edge three 16 has an inclined slope two 21, after the front knife 2 and the rear knife 3 are closed, the slope one 20 and the slope two 21 are oppositely arranged and form the containing groove one 18, the width of the containing groove one 18 gradually increases from inside to outside, and the shape of the flange three 11 is adapted to the shape of the containing groove one 18.

[0048] The accommodating groove one 18 is a dovetail groove with large outer and small inner, the shape of the flange three 11 is adapted to the shape of the accommodating groove one 18, and the flange three 11 of the left knife 4 extends into the accommodating groove one 18 after the front knife 2 and the rear knife 3 are closed, and the flange three 11, the convex edge one 14 and the convex edge three 16 can better fold and form the cloth.

[0049] As shown in the drawings, Figure 4 In the embodiment, the convex edge one 14 has a notch one 22, the convex edge three 16 has a notch two 23, the notch one 22 and the notch two 23 form a let-in groove one 24 after the front knife 2 and the rear knife 3 are closed, and the let-in groove one 24 is communicated with the accommodating groove one 18.

[0050] The let-in groove one 24 is used for accommodating the bottom of the main plate body three 10 of the left knife 4, and the accommodating groove one 18 is used for accommodating the flange three 11, so that interference can be better avoided.

[0051] As shown in the drawings, Figure 3 and 5 In the embodiment, the convex edge two 15 has an inclined inclined surface three 25, the convex edge four 17 has an inclined inclined surface four 26, the inclined surface three 25 and the inclined surface four 26 are oppositely arranged and form an accommodating groove two 19 after the front knife 2 and the rear knife 3 are closed, the width of the accommodating groove two 19 gradually increases from inside to outside, and the shape of the flange four 13 is adapted to the shape of the accommodating groove two 19.

[0052] The accommodating groove two 19 is a dovetail groove with large outer and small inner, the shape of the flange four 13 is adapted to the shape of the accommodating groove two 19, the flange four 13 of the right knife 5 extends into the accommodating groove two 19 after the front knife 2 and the rear knife 3 are closed, and the flange four 13, the convex edge two 15 and the convex edge four 17 can better fold and form the cloth.

[0053] As shown in the drawings, Figure 5 In the embodiment, the convex edge two 15 has a notch three 27, the convex edge four 17 has a notch four 28, the notch three 27 and the notch four 28 form a let-in groove two 29 after the front knife 2 and the rear knife 3 are closed, and the let-in groove two 29 is communicated with the accommodating groove two 19.

[0054] The let-in groove two 29 is used for accommodating the bottom of the main plate body four 12 of the right knife 5, and the accommodating groove two 19 is used for accommodating the flange four 13, so that interference can be better avoided.

[0055] As shown in the drawings, Figure 1As shown, in this embodiment, a cylinder 44 is provided below the base 1, and a slider seat 45 is provided on the piston rod of the cylinder 44. Four bosses 46 are distributed around the slider seat 45. Connecting rod 1 32, connecting rod 2 33, connecting block 1 37 and connecting block 2 38 are movably connected to the base 1. The left insert 4 and the right insert 5 are respectively installed on the connecting rod 1 32 and the connecting rod 2 33. The front insert 2 and the rear insert 3 are respectively installed on the connecting block 1 37 and the connecting block 2 38. The connecting rod 1 32, the connecting rod 2 33, the connecting block 1 37 and the connecting block 2 38 are respectively equipped with slider 2 47. The slider 2 47 is provided with mounting groove 48. The mounting groove 48 has an inclined guide surface 49. An inclined guide block 50 is installed on the outer side of the boss 46. The guide block 50 is slidably connected in the corresponding mounting groove 48 and abuts against the guide surface 49 of the mounting groove 48.

[0056] The side wall of the mounting groove 48 has a limiting flange to prevent the guide block 50 from falling out of the mounting groove 48. When the piston rod of the cylinder 44 retracts, the piston rod drives the slider seat 45 to move downward. The slider seat 45 drives the front insert knife 2, rear insert knife 3, left insert knife 4, and right insert knife 5 to move closer together through the bosses 46, completing the folding action. When the piston rod of the cylinder 44 extends, the piston rod drives the slider seat 45 to move upward. The slider seat 45 drives the front insert knife 2, rear insert knife 3, left insert knife 4, and right insert knife 5 to move away from each other through the bosses 46, so that the four insert knives are reset.

[0057] This structure can drive the movement of four insert blades with only one cylinder 44, simplifying the structure and enabling it to complete the fabric folding process very well.

[0058] Example 2

[0059] This embodiment is basically the same in structure and principle as Embodiment 1, the difference being that, Figure 6 As shown, a finger cylinder 30 is provided on the base 1. The finger cylinder 30 has two grippers 31. Each gripper 31 is equipped with a connecting rod 32 and a connecting rod 33. The connecting rods 32 and 33 are movably connected to the base 1. A left insert knife 4 and a right insert knife 5 are respectively installed on the connecting rods 32 and 33. A finger cylinder 34 is also provided on the base 1. The finger cylinder 34 has two grippers 35. Each gripper 35 is equipped with a front insert knife 2 and a rear insert knife 3.

[0060] Driven by the finger cylinder 30, the two grippers 31 can move towards each other or in opposite directions. The two grippers 31 drive the left inserter 4 and the right inserter 5 to move closer or further apart simultaneously via the connecting rod 32 and the connecting rod 33, respectively. Driven by the finger cylinder 34, the two grippers 35 can move towards each other or in opposite directions. The two grippers 35 drive the front inserter 2 and the rear inserter 3 to move closer or further apart simultaneously, respectively.

[0061] This folding device can drive the left insert 4 and right insert 5 to move simultaneously, bringing them closer or further apart, using a finger cylinder 30. Similarly, it can drive the front insert 2 and rear insert 3 to move simultaneously, bringing them closer or further apart. Using only two cylinders 44, it can drive the movement of four inserts, thus completing the folding of pocket fabric with a simplified structure.

[0062] like Figure 7 As shown, in this embodiment, a guide rail 36 is installed at the bottom of the base 1, and a connecting block 37 and a connecting block 38 are respectively installed on each of the grippers 35. The front inserter 2 and the rear inserter 3 are respectively installed on the connecting block 37 and the connecting block 38, and the connecting block 37 and the connecting block 38 are slidably connected to the guide rail 36.

[0063] The front inserter 2 is mounted on a gripper 35 via a connecting block 37, and the rear inserter 3 is mounted on another gripper 35 via a connecting block 38. The guide rail 36 guides the connecting blocks 37 and 38, improving the stability of the front inserter 2 and the rear inserter 3 during movement.

[0064] As one embodiment, a slider 43 is installed on the connecting block 37 and the connecting block 38 respectively. The slider 43 is slidably connected to the guide rail 36, that is, the connecting block 37 and the connecting block 38 are slidably connected to the guide rail 36 through the slider 43.

[0065] like Figure 7 As shown, in this embodiment, the bottom of the base 1 is equipped with guide rail 2 39 and guide rail 3 40. The bottom of the connecting rod 1 32 and the connecting rod 2 33 are respectively equipped with connecting block 3 41 and connecting block 42. The bottom of the connecting block 3 41 and the connecting block 42 are respectively equipped with left insert 4 and right insert 5. The connecting block 3 41 and the connecting block 42 are slidably connected to the guide rail 2 39 and the guide rail 3 40.

[0066] Guide rail 2 39 and guide rail 3 40 respectively guide connecting block 3 41 and connecting block 4 42, improving the stability of connecting rod 1 32 and connecting rod 2 33 when they move, and also improving the stability of left insert 4 and right insert 5 when they move.

[0067] In one embodiment, connecting block 3 41 is slidably connected to guide rail 2 39 via slider 1 43, and connecting block 42 is slidably connected to guide rail 3 40 via slider 1 43.

[0068] This utility model also provides a bag opening machine, which includes any of the above-mentioned fabric folding devices.

[0069] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A cloth folding device, comprising a base (1), wherein a front inserting knife (2), a rear inserting knife (3), a left inserting knife (4) and a right inserting knife (5) are movably arranged on the base (1), the front inserting knife (2) comprises a main plate body one (6) with a turning edge one (7), the rear inserting knife (3) comprises a main plate body two (8) with a turning edge two (9), the left inserting knife (4) comprises a main plate body three (10) with a turning edge three (11), and the right inserting knife (5) comprises a main plate body four (12) with a turning edge four (13), characterized in that, The one end and the other end of the first flange (7) are respectively provided with a first protrusion (14) and a second protrusion (15), and the one end and the other end of the second flange (9) are respectively provided with a third protrusion (16) and a fourth protrusion (17), when the front cutter (2) and the rear cutter (3) are closed, the first protrusion (14) and the third protrusion (16) form a first accommodating groove (18) capable of accommodating the third flange (11), and the second protrusion (15) and the fourth protrusion (17) form a second accommodating groove (19) capable of accommodating the fourth flange (13).

2. A cloth folding device according to claim 1, wherein The first protrusion (14) is provided with an inclined first slope (20), and the third protrusion (16) is provided with an inclined second slope (21), when the front cutter (2) and the rear cutter (3) are closed, the first slope (20) and the second slope (21) are oppositely arranged and form the first accommodating groove (18), the width of the first accommodating groove (18) gradually increases from inside to outside, and the shape of the third flange (11) is adapted to the shape of the first accommodating groove (18).

3. A cloth folding device according to claim 2, wherein The first protrusion (14) is provided with a first notch (22), and the third protrusion (16) is provided with a second notch (23), when the front cutter (2) and the rear cutter (3) are closed, the first notch (22) and the second notch (23) form a first displacement groove (24) in communication with the first accommodating groove (18).

4. A cloth folding device according to claim 1, wherein The second protrusion (15) is provided with an inclined third slope (25), and the fourth protrusion (17) is provided with an inclined fourth slope (26), when the front cutter (2) and the rear cutter (3) are closed, the third slope (25) and the fourth slope (26) are oppositely arranged and form the second accommodating groove (19), the width of the second accommodating groove (19) gradually increases from inside to outside, and the shape of the fourth flange (13) is adapted to the shape of the second accommodating groove (19).

5. A fabric folding device according to claim 4, wherein The second protrusion (15) is provided with a third notch (27), and the fourth protrusion (17) is provided with a fourth notch (28), when the front cutter (2) and the rear cutter (3) are closed, the third notch (27) and the fourth notch (28) form a second displacement groove (29) in communication with the second accommodating groove (19).

6. A fabric folding device according to any one of claims 1 to 5, wherein The base (1) is provided with a first finger air cylinder (30), the first finger air cylinder (30) is provided with two first clamping jaws (31), each first clamping jaw (31) is respectively provided with a first connecting rod (32) and a second connecting rod (33), the first connecting rod (32) and the second connecting rod (33) are movably connected to the base (1), the left cutter (4) and the right cutter (5) are respectively arranged on the first connecting rod (32) and the second connecting rod (33), and the base (1) is further provided with a second finger air cylinder (34), the second finger air cylinder (34) is provided with two second clamping jaws (35), and the front cutter (2) and the rear cutter (3) are respectively arranged on the second clamping jaws (35).

7. A fabric folding device according to claim 6, wherein The bottom of the base (1) is provided with a guide rail one (36), each clamping jaw two (35) is respectively provided with a connecting block one (37) and a connecting block two (38), the front cutting knife (2) and the rear cutting knife (3) are respectively installed on the connecting block one (37) and the connecting block two (38), and the connecting block one (37) and the connecting block two (38) are respectively slidably connected to the guide rail one (36).

8. A fabric folding device according to claim 6, wherein The bottom of the base (1) is provided with a guide rail two (39) and a guide rail three (40), the bottom of the connecting rod one (32) and the connecting rod two (33) is respectively provided with a connecting block three (41) and a connecting block four (42), the bottom of the connecting block three (41) and the connecting block four (42) is respectively provided with the left cutting knife (4) and the right cutting knife (5), and the connecting block three (41) and the connecting block four (42) are respectively slidably connected to the guide rail two (39) and the guide rail three (40).

9. A fabric folding device according to any one of claims 1 to 5, wherein The bottom of the base (1) is provided with a cylinder (44), the piston rod of the cylinder (44) is provided with a sliding block seat (45), four bosses (46) are distributed in the circumferential direction of the sliding block seat (45), the connecting rod one (32), the connecting rod two (33), the connecting block one (37) and the connecting block two (38) are movably connected to the base (1), the left cutting knife (4) and the right cutting knife (5) are respectively installed on the connecting rod one (32) and the connecting rod two (33), the front cutting knife (2) and the rear cutting knife (3) are respectively installed on the connecting block one (37) and the connecting block two (38), the connecting rod one (32), the connecting rod two (33), the connecting block one (37) and the connecting block two (38) are respectively provided with a sliding block two (47), the sliding block two (47) is respectively provided with a mounting groove (48), the mounting groove (48) has an inclined guide surface (49), the outer side of the boss (46) is respectively provided with an inclined guide block (50), the guide block (50) is slidably connected in the corresponding mounting groove (48) and abuts against the guide surface (49) of the mounting groove (48).

10. An opening machine characterized by comprising: The bag opening machine comprises the cloth folding device of any one of claims 1-9.

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