Postal paper bag forming and point cutting device

Abstract

The object of the present invention is to disclose a die-cutting device for forming a postal paper bag, which includes a die-cutting roller and a supporting roller. The die-cutting roller is provided with a first horizontal knife, a first vertical knife, a second horizontal knife, a second vertical knife and a third horizontal knife. The cutting edges of the first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are all discontinuous cutting edges. The first horizontal knife and the third horizontal knife are arranged on a first working surface, and the second horizontal knife is arranged on a second working surface. The first working surface and the second working surface are in a flared shape and their extension surfaces intersect at the center line of the die-cutting roller. The extension lines of the first side edge and the second side edge intersect at the center line of the die-cutting roller. The first working surface and the second working surface are arranged in a flared shape and their extension surfaces intersect at the center line of the die-cutting roller, so that the cutting edge of the horizontal knife cuts perpendicular to the paper surface, and the force application direction of the cutting edge is aligned with the center line of the die-cutting roller, greatly reducing the wear of the cutting edge and making the horizontal knife not easily damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of forming of postal paper bags, and in particular to a point-cutting device for forming postal paper bags. Background Art

[0002] With the improvement of the environmental protection concept, the uses of postal paper bags are increasing day by day, and recyclable postal paper bags are getting more and more attention. Such postal paper bags are provided with a tongue opening, and the purpose of the tongue opening is to quickly seal the postal paper bag.

[0003] With the intensification of e-commerce competition, people have a higher pursuit of the forming efficiency of postal paper bags. However, at present, postal paper bags and their tongue openings are mainly formed by die-cutting. On the one hand, the forming efficiency is low and continuous production cannot be achieved. On the other hand, die-cutting will cause a large amount of peripheral materials to be wasted. Therefore, the existing forming methods of postal paper bags and their tongue openings have the defects of high cost and low efficiency, which affect the popularization of postal paper bags.

[0004] In view of this, there is an urgent need to develop a forming device for postal paper bags with the function of point-cutting the tongue opening to provide a basis for the continuous production of postal paper bags. Summary of the Invention

[0005] To solve the above technical problems, the purpose of the present invention is to disclose a point-cutting device for forming postal paper bags, and by means of a plurality of point-cutting knives arranged on a point-cutting roller, the shape of the tongue opening of the postal paper bag is point-cut to provide a basis for the subsequent formation of the tongue opening.

[0006] To achieve the above invention purpose, the present invention provides a point-cutting device for forming postal paper bags, including a point-cutting roller and a supporting roller. The point-cutting roller is provided with a first horizontal knife, a first vertical knife, a second horizontal knife, a second vertical knife and a third horizontal knife. The cutting edges of the first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are all discontinuous cutting edges;

[0007] The first horizontal knife and the third horizontal knife are arranged on a first working surface, the second horizontal knife is arranged on a second working surface, and the first working surface and the second working surface are in a flared shape and their extension surfaces intersect at the center line of the point-cutting roller;

[0008] The first horizontal knife includes a first end and a second end, the second horizontal knife includes a third end and a fourth end, and the third horizontal knife includes a fifth end and a sixth end;

[0009] The first vertical knife and the second vertical knife are both arc-shaped cutting edges. The first vertical knife includes a first side edge and a second side edge. The first side edge is in contact with the second end, and the second side edge is in contact with the third end. The second vertical knife includes a third side edge and a fourth side edge. The third side edge is in contact with the fifth end, and the fourth side edge is in contact with the fourth end;

[0010] The extension lines of the first side and the second side intersect at the center line of the point cutting roller, and the extension lines of the third side and the fourth side intersect at the center line of the point cutting roller.

[0011] Preferably, the point cutting roller is provided with a flared groove body, and the flared groove body includes a first side wall, a second side wall and a bottom wall. The first side wall overlaps with the first working surface, and the second side wall overlaps with the second working surface.

[0012] Preferably, the first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are fixed by a stop block corresponding to the flared groove body. The first vertical knife is fixed to one side of the stop block, and the second vertical knife is fixed to one side of the stop block.

[0013] Preferably, a protrusion is provided on the bottom wall, and a groove is correspondingly provided at the bottom of the stop block, and the protrusion and the groove are cooperatively arranged.

[0014] Preferably, a first defect part and a second defect part are respectively provided on the side of the stop block. The first defect part is for installing the first horizontal knife or the third horizontal knife, and the second defect part is for installing the second horizontal knife.

[0015] Preferably, the cutting edges of the first horizontal knife, the second horizontal knife and the third horizontal knife are all serrated.

[0016] Preferably, the arc-shaped edges of the first vertical knife and the second vertical knife include a blade part and a notch, and the ratio of the width of the blade part to the width of the notch is 2:1.

[0017] Preferably, the support roller is a rubber roller.

[0018] Preferably, the support roller is provided with a height adjustment mechanism, and the height adjustment mechanism includes a handle, a rotating shaft, a first gear, a second gear, a third gear, a fourth gear, a first lead screw, a first lead screw seat, a second lead screw and a second lead screw seat;

[0019] The first gear and the third gear are arranged on the rotating shaft. The first lead screw seat supports the first side of the support roller, and the second lead screw seat supports the second side of the support roller. The second gear is fixed to the bottom of the first lead screw, and the fourth gear is fixed to the bottom of the second lead screw;

[0020] The first gear and the second gear are vertically meshed, and the third gear and the fourth gear are vertically meshed.

[0021] Preferably, a clutch mechanism is provided between the first gear and the handle. The clutch mechanism includes a spring and a clutch sleeve. The first gear is rotatably arranged on the rotating shaft through a bushing, and a meshing structure is provided between the bushing and the clutch sleeve.

[0022] Compared with the prior art, the technical effects of the present invention are as follows:

[0023] (1) The continuous web passes between the dot-cutting roller and the supporting roller, forming dot-cutting lines on the paper surface. Tearing along the dot-cutting lines will become the tongues after the postal paper bag is formed.

[0024] (2) The cutting edges of the first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are all discontinuous cutting edges, which are convenient for forming dot-cutting lines on the paper surface.

[0025] (3) The first working surface and the second working surface are arranged in a flared shape and the extension surfaces of the two intersect at the center line of the dot-cutting roller. That is, when the first horizontal knife, the second horizontal knife and the third horizontal knife dot-cut the paper surface, their cutting edges are perpendicular to the paper surface, making it easier to form dot-cutting lines. And due to the perpendicular dot-cutting, the force direction of the cutting edge is aligned with the center line of the dot-cutting roller, greatly reducing the wear of the cutting edge and making the horizontal knife not easily damaged.

[0026] (4) The extension lines of the first side and the second side of the first vertical knife intersect at the center line of the dot-cutting roller and the cutting edge of the first vertical knife is arc-shaped. The radian of the cutting edge of the first vertical knife is the same as that of the dot-cutting roller, so that the cutting point of the cutting edge of the first vertical knife always remains perpendicular to the cutting surface during the process of dot-cutting the paper surface, and the force direction of the cutting point points to the center of the dot-cutting roller, greatly reducing the wear of the cutting edge and making the first vertical knife not easily damaged.

[0027] (5) The extension lines of the third side and the fourth side of the second vertical knife intersect at the center line of the dot-cutting roller and the cutting edge of the second vertical knife is arc-shaped. The radian of the cutting edge of the second vertical knife is the same as that of the dot-cutting roller, so that the cutting point of the cutting edge of the second vertical knife always remains perpendicular to the cutting surface during the process of dot-cutting the paper surface, and the force direction of the cutting point points to the center of the dot-cutting roller, greatly reducing the wear of the cutting edge and making the second vertical knife not easily damaged. Description of the Drawings

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic three-dimensional structure diagram of the dot-cutting device of the present invention.

[0030] Figure 2 It is a schematic cross-sectional view of the dot-cutting roller of the present invention.

[0031] Figure 3It is a schematic perspective view of the partial enlargement of the dot-cutting roller of the present invention.

[0032] Figure 4 It is the present invention Figure 3 Schematic diagram of the enlarged structure of part A.

[0033] Figure 5 It is a schematic diagram of the shape of the dot-cutting line of the present invention.

[0034] Figure 6 It is a schematic diagram of the height adjustment mechanism on the first side of the support roller of the present invention.

[0035] Figure 7 It is a schematic diagram of the height adjustment mechanism on the second side of the support roller of the present invention.

[0036] Among them, 1. Dot-cutting roller; 11. First cross knife; 111. First end; 112. Second end; 12. First vertical knife; 121. First side; 122. Second side; 123. Edge part; 124. Notch; 13. Second cross knife; 131. Third end; 132. Fourth end; 14. Second vertical knife; 141. Third side; 142. Fourth side; 15. Third cross knife; 151. Fifth end; 152. Sixth end; 16. First working surface; 17. Second working surface; 18. Center line; 19. Screw hole; 2. Support roller; 21. First side; 22. Second side; 3. Dot-cutting line; 4. Flared groove body; 41. First side wall; 42. Second side wall; 43. Bottom wall; 431. Protrusion; 5. Stopper; 51. First defective part; 52. Second defective part; 53. Groove; 6. Height adjustment mechanism; 61. Handle; 62. Rotating shaft; 63. First gear; 631. Bush; 64. Second gear; 65. Third gear; 66. Fourth gear; 67. First lead screw; 68. First lead screw seat; 69. Second lead screw; 70. Second lead screw seat; 7. Clutch mechanism; 71. Spring; 72. Clutch sleeve; 721. Meshing structure. Specific embodiments

[0037] The present invention will be described in detail below in conjunction with the embodiments shown in the drawings. However, it should be noted that these embodiments are not limitations on the present invention, and any equivalent transformation or substitution in terms of function, method, or structure made by those of ordinary skill in the art based on these embodiments shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Embodiment 1

[0039] Refer Figures 1 to 5 As shown, this embodiment discloses a specific implementation manner of a forming and point-cutting device for postal paper bags (hereinafter referred to as "point-cutting device").

[0040] For the forming and point-cutting device for postal paper bags, refer to Figures 1 to 5 , which includes a point-cutting roller 1 and a supporting roller 2. The point-cutting roller 1 is provided with a first cross knife 11, a first vertical knife 12, a second cross knife 13, a second vertical knife 14 and a third cross knife 15. The blade parts of the first cross knife 11, the first vertical knife 12, the second cross knife 13, the second vertical knife 14 and the third cross knife 15 are all discontinuous blades. A discontinuous blade means that its blade part is discontinuous and its blade has several notches, so that the paper after point-cutting is in a disconnected state; the first cross knife 11 and the third cross knife 15 are arranged on a first working surface 16, the second cross knife 13 is arranged on a second working surface 17, and the first working surface 16 and the second working surface 17 are in a flared shape and their extension surfaces intersect at the center line 18 of the point-cutting roller; the first cross knife 11 includes a first end 111 and a second end 112, the second cross knife 13 includes a third end 131 and a fourth end 132, and the third cross knife 15 includes a fifth end 151 and a sixth end 152; the first vertical knife 12 and the second vertical knife 14 are both arc-shaped blades. The first vertical knife 12 includes a first side 121 and a second side 122. The first side 121 contacts the second end 112, and the second side 122 contacts the third end 131. The second vertical knife 14 includes a third side 14 and a fourth side 142. The third side 141 contacts the fifth end 151, and the fourth side 142 contacts the fourth end 132; the extension lines of the first side 121 and the second side 122 intersect at the center line 18 of the point-cutting roller, and the extension lines of the third side 141 and the fourth side 142 intersect at the center line 18 of the point-cutting roller.

[0041] Specifically, during the process of continuously forming a roll of paper into a tube and forming it into a postal paper bag, the discontinuous blade pre-cuts the shape of the tongue of the postal paper bag by point-cutting. The point-cutting line 3 refers to Figure 5The shape of the dotted line becomes the tongue of the postal paper bag after being broken along the point tangent line 3 during the forming process of the postal paper bag. Through the point tangent line 3, the paper can still have sufficient strength to ensure continuous tube forming, and it is also easy to break subsequently. This is a key step in efficiently forming the postal paper bag. For this reason, the point cutting knife is set on the point cutting roller 1 to form the point tangent line 3 when the paper passes between the point cutting roller 1 and the support roller 2. To achieve efficient point cutting, the specific structure is as follows: Refer to Figures 1 to 4 , a flared groove body 4 is provided on the point cutting roller 1. The flared groove body 4 includes a first side wall 41, a second side wall 42, and a bottom wall 43. The first side wall 41 overlaps with the first working surface 16, and the second side wall 42 overlaps with the second working surface 17; the first cross knife 11, the first vertical knife 12, the second cross knife 13, the second vertical knife 14, and the third cross knife 15 are fixed by a stop block 5 corresponding to the flared groove body 4. The first vertical knife 12 is fixed on one side of the stop block 5, and the second vertical knife 12 is fixed on the other side of the stop block 5; a protrusion 431 is provided on the bottom wall 43, and a groove 53 is correspondingly provided at the bottom of the stop block 5, and the protrusion 431 and the groove 53 are cooperatively arranged; a first missing part 51 and a second missing part 52 are respectively provided on the side of the stop block 5. The first missing part 51 installs the first cross knife 11 or the third cross knife 15, and the second missing part 52 installs the second cross knife 13.

[0042] The principle of forming the point tangent line 3 is as follows: Refer to Figures 1 to 4, the extension surfaces of the first side wall 41 and the second side wall 42 intersect at the center line 18 of the dotting roller 1. Press the first cross knife 11 and the third cross knife 15 against the first side wall 41, press the second cross knife 13 against the second side wall 42, and then fix the first cross knife 11, the second cross knife 13 and the third cross knife 15 with a number of stoppers 5 corresponding to the shape of the flared groove body 4. The stoppers 5 are fixed to the bottom wall 43 by screws. To further fix the first cross knife 11, the second cross knife 13 and the third cross knife 15, install the first cross knife 11 or the third cross knife 15 in the first defect part 51, install the second cross knife 13 in the second defect part 52, and pass screws through the screw holes 19 in a number of screw holes 19 of the dotting roller 1 to further fix the first cross knife 11, the second cross knife 13 and the third cross knife 15; the first vertical knife 12 is fixed to one side of one of the stoppers 5 by screws, and the second side knife 14 is fixed to one side of another stopper 5 by screws; the first working surface 16 and the second working surface 17 are arranged in a flared shape and the extension surfaces of the two intersect at the center line 18 of the dotting roller 1, that is, when the first cross knife 11, the second cross knife 13 and the third cross knife 15 dot the paper surface, the blade parts are perpendicular to the paper surface, which is easier to form dotting lines. And due to vertical dotting, the force application direction of the blade part is aligned with the center line of the dotting roller, greatly reducing the wear of the blade part, and the cross knife is not easily damaged; the extension lines of the first side 121 and the second side 122 of the first vertical knife 12 intersect at the center line 18 of the dotting roller 1 and the blade part of the first vertical knife 12 is arc-shaped, and the radian of the blade part of the first vertical knife 12 is the same as the radian of the dotting roller 1, so that the cutting point of the blade part of the first vertical knife 12 always remains perpendicular to the cutting surface during the process of dotting the paper surface, and the force application direction of the cutting point points to the center of the dotting roller, greatly reducing the wear of the blade part, and the first vertical knife 12 is not easily damaged; the extension lines of the third side 141 and the fourth side 142 of the second vertical knife 14 intersect at the center line 18 of the dotting roller 1 and the blade part of the second vertical knife 14 is arc-shaped, and the radian of the blade part of the second vertical knife 14 is the same as the radian of the dotting roller 1, so that the cutting point of the blade part of the second vertical knife 14 always remains perpendicular to the cutting surface during the process of dotting the paper surface, and the force application direction of the cutting point points to the center of the dotting roller, greatly reducing the wear of the blade part, and the second vertical knife 14 is not easily damaged.

[0043] It should be further noted that, referring to Figures 1 to 4 , a number of screw holes 19 are provided on the dotting roller 1, so that the positions of a number of stoppers 5 can be adjusted according to the actual situation, so that the positions of the cross knife and the vertical knife can also be adjusted according to the actual situation, and the length of the cross knife can also be adjusted according to the actual length of the dotting line, increasing the adaptability of the dotting roller 1, and different sizes of tongue openings of postal paper bags can be dotted.

[0044] Referring to Figures 1 to 4, as a preferred embodiment, the support roller 2 is a rubber roller, and the cutting edges of the first horizontal knife 11, the second horizontal knife 13 and the third horizontal knife 15 are all serrated, that is, each serration is a wedge with a tip. Since the support roller 2 is a rubber roller, the penetration depth of the serrations will affect the length of each incision of the point tangent line, thereby determining the tensile strength of the paper; the arc-shaped blades of the first vertical knife 12 and the second vertical knife 14 include a blade part 123 and a notch 124, and the width ratio of the blade part 123 to the width of the notch 124 is 2:1. Specifically, the blade part 123 is arc-shaped, ensuring that each blade part cuts the paper vertically, that is, the force application direction of each blade part 123 points to the center of the point cutting roller 1, minimizing the friction force received by the blade part 123 and increasing the service life of the vertical knife. In addition, the width ratio of the blade part 123 to the width of the notch 124 is 2:1, making the length ratio of the incision of the vertical point tangent line to the connecting part 2:1. This ratio not only ensures the forming strength of the paper, but also does not require too much effort to remove the excess part later, and it is easy to tear along the vertical point tangent line to form the tongue of the postal paper bag.

[0045] See Figure 6 and Figure 7 , in order to facilitate the adjustment of the distance between the point cutting roller 1 and the support roller 2 to control the penetration depth of the serrations and thus control the length of the incision of the point tangent line, the support roller 2 is provided with a height adjustment mechanism 6. The height adjustment mechanism 6 includes a handle 61, a rotating shaft 62, a first gear 63, a second gear 64, a third gear 65, a fourth gear 66, a first lead screw 67, a first lead screw seat 68, a second lead screw 69 and a second lead screw seat 70; the first gear 63 and the third gear 65 are arranged on the rotating shaft, the first lead screw seat 68 supports the first side 21 of the support roller 2, the second lead screw seat 70 supports the second side 22 of the support roller 2, the second gear 64 is fixed to the bottom of the first lead screw 67, and the fourth gear 66 is fixed to the bottom of the second lead screw 69; the first gear 63 and the second gear 64 are vertically meshed, and the third gear 65 and the fourth gear 66 are vertically meshed.

[0046] Specifically, see Figure 6 and Figure 7, both ends of the supporting roller 2 are respectively the first side 21 and the second side 22; the first side 21 is supported by the first lead screw seat 68, and the first lead screw seat 68 is driven to lift by screwing the first lead screw 67, so that the first side 21 is lifted. Specifically, by turning the handle 61, the rotating shaft 62 is driven to rotate, thereby driving the first gear 63 to rotate, and then the first lead screw 67 is driven to rotate through the vertically meshing second gear 64, so as to realize the adjustment of the lifting of the first side 21; the second side 22 is supported by the second lead screw seat 70, and the second lead screw seat 70 is driven to lift by screwing the second lead screw 69, so that the second side 22 is lifted. Specifically, by turning the handle 61, the rotating shaft 62 is driven to rotate, thereby driving the third gear 65 to rotate, and then the second lead screw 69 is driven to rotate through the vertically meshing fourth gear 66, so as to realize the adjustment of the lifting of the second side 22.

[0047] See Figure 6 and Figure 7 , when the dot cutting roller 1 and the supporting roller 2 are not parallel, the lengths of the incisions of the dot cutting line will be inconsistent, which will cause trouble for the subsequent forming of the tongue of the postal paper bag. Therefore, a clutch mechanism 7 is arranged between the first gear 63 and the handle 61. The clutch mechanism 7 includes a spring 71 and a clutch sleeve 72. The first gear 63 is rotatably arranged on the rotating shaft 62 through a bushing 631. A meshing structure 721 is arranged between the bushing 631 and the clutch sleeve 72. The meshing structure 721 includes the convex and concave structures of the clutch sleeve 72 and the convex and concave structures on the bushing 631. When the convex and concave structures and the convex and concave structures cooperate, meshing is formed, and then the two are squeezed together by the spring 71 to form a relatively fixed connection. In the case of a fixed connection, when the handle 61 is screwed, the first gear 63 and the third gear 65 will be driven to rotate simultaneously, so as to realize the synchronous lifting of both ends of the supporting roller 2; when the convex and concave structures are separated from each other, because the bushing 631 is rotatably arranged on the rotating shaft 62, when the handle 61 is screwed, only the third gear 65 will be driven to rotate, and the first gear 63 will not be driven to rotate, so as to realize the lifting of the second side 22 of the supporting roller 2. When the dot cutting roller 1 and the supporting roller 2 are not parallel, after the two are parallel, the convex and concave structures and the convex and concave structures are then matched, and the distance between the dot cutting roller 1 and the supporting roller 2 is adjusted by synchronous lifting, so as to adjust the penetration depth of the saw teeth, and the length of each incision of the dot cutting line is adjusted, thereby determining the tensile strength of the paper. It is necessary to ensure the tensile strength necessary for the forming of the postal paper bag, and at the same time, it is necessary to ensure that it is easy to tear off the redundant part along the dot cutting line later, so as to form the tongue opening of the postal paper bag.

Claims

1. Postman's paper bag forming and point-cutting device, characterized in that It includes a dot-cutting roller and a supporting roller. The dot-cutting roller is provided with a first horizontal knife, a first vertical knife, a second horizontal knife, a second vertical knife and a third horizontal knife. The cutting edges of the first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are all discontinuous cutting edges, and the discontinuous cutting edges pre-cut the shape of the tongue of the postal paper bag by dot-cutting; The first horizontal knife and the third horizontal knife are arranged on a first working surface, the second horizontal knife is arranged on a second working surface, and the first working surface and the second working surface are in a flared shape and their extension surfaces intersect at the center line of the dot-cutting roller; The first horizontal knife includes a first end and a second end, the second horizontal knife includes a third end and a fourth end, and the third horizontal knife includes a fifth end and a sixth end; The first vertical knife and the second vertical knife are both arc-shaped blades. The first vertical knife includes a first side and a second side. The first side contacts the second end, and the second side contacts the third end. The second vertical knife includes a third side and a fourth side. The third side contacts the fifth end, and the fourth side contacts the fourth end; The extension lines of the first side and the second side intersect at the center line of the dot-cutting roller, and the extension lines of the third side and the fourth side intersect at the center line of the dot-cutting roller; The radian of the cutting edge part of the first vertical knife is the same as the radian of the dot-cutting roller, and the radian of the cutting edge part of the second vertical knife is the same as the radian of the dot-cutting roller; The dot-cutting roller is provided with a flared groove body, and the first horizontal knife, the second horizontal knife and the third horizontal knife are fixed by screws and several blocks.

2. The die-cutting device for forming a postal paper bag according to claim 1, wherein, The flared groove body includes a first side wall, a second side wall and a bottom wall. The first side wall overlaps with the first working surface, and the second side wall overlaps with the second working surface.

3. The postal paper bag forming and point-cutting device according to claim 2, characterized in that, The first horizontal knife, the first vertical knife, the second horizontal knife, the second vertical knife and the third horizontal knife are fixed by blocks corresponding to the flared groove body. The first vertical knife is fixed on one side of the block, and the second vertical knife is fixed on one side of the block.

4. The die-cutting device for forming a postal paper bag according to claim 3, characterized in that, A protrusion is arranged on the bottom wall, and a groove is correspondingly arranged at the bottom of the block, and the protrusion and the groove are cooperatively arranged.

5. The die-cutting device for forming a postal paper bag according to claim 3, wherein, A first missing part and a second missing part are respectively arranged on the side of the block. The first missing part installs the first horizontal knife or the third horizontal knife, and the second missing part installs the second horizontal knife.

6. The die-cutting device for forming a postal paper bag according to any one of claims 1-5, characterized in that, The cutting edges of the first horizontal knife, the second horizontal knife and the third horizontal knife are all serrated.

7. The point-cutting device for forming a postal paper bag according to any one of claims 1-5, characterized in that, The arc-shaped blades of the first vertical knife and the second vertical knife include a blade part and a notch, and the width ratio of the blade part to the notch width is 2:

1.

8. The die-cutting device for forming a postal paper bag according to any one of claims 1-5, characterized in that, The supporting roller is a rubber roller.

9. The die-cutting device for forming a postal paper bag according to claim 8, wherein, The supporting roller is provided with a height adjusting mechanism. The height adjusting mechanism includes a handle, a rotating shaft, a first gear, a second gear, a third gear, a fourth gear, a first lead screw, a first lead screw seat, a second lead screw and a second lead screw seat; The first gear and the third gear are arranged on the rotating shaft. The first lead screw seat supports the first side of the supporting roller, and the second lead screw seat supports the second side of the supporting roller. The second gear is fixed at the bottom of the first lead screw, and the fourth gear is fixed at the bottom of the second lead screw; The first gear and the second gear are vertically meshed, and the third gear and the fourth gear are vertically meshed.

10. The die-cutting device for forming a postal paper bag according to claim 9, wherein, A clutch mechanism is provided between the first gear and the handle. The clutch mechanism includes a spring and a clutch sleeve. The first gear is rotatably arranged on the rotating shaft through a shaft sleeve, and a meshing structure is provided between the shaft sleeve and the clutch sleeve.

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