Slitting mechanism for web sack machine

Abstract

This utility model relates to a slitting mechanism for a roll paper bag machine, including a frame, a controller, a traction wheel assembly, a slitting wheel assembly, a pressure wheel assembly, a pressure wheel lifting and resetting assembly, an accelerating semi-rubber wheel assembly, and a paper receiving wheel assembly. The traction wheel assembly, slitting wheel assembly, pressure wheel assembly, pressure wheel lifting and resetting assembly, accelerating semi-rubber wheel assembly, and paper receiving wheel assembly are connected to the front of the frame. The traction wheel assembly, slitting wheel assembly, pressure wheel assembly, pressure wheel lifting and resetting assembly, accelerating semi-rubber wheel assembly, and paper receiving wheel assembly are arranged sequentially from right to left. The pressure wheel lifting and resetting assembly is connected to the pressure wheel assembly and is used to control the lifting and pressing of the pressure wheel assembly. The traction wheel assembly, slitting wheel assembly, pressure wheel assembly, accelerating semi-rubber wheel assembly, and paper receiving wheel assembly are all connected to the controller. The advantages are: it can slit both serrated and flat paper bags, increasing the range of paper cutting lengths for the slitting blade.

Description

Technical Field

[0001] This utility model relates to the field of paper bag machine technology, and in particular to a slitting mechanism for roll paper bag machines. Background Technology

[0002] With the tightening of national environmental protection policies, the market demand for environmentally friendly paper bags is growing stronger. As a result, the speed requirements for environmentally friendly paper bag production equipment are also increasing, from dozens per minute to hundreds per minute, or even thousands per minute.

[0003] Traditional paper bag making machines offer limited bag types and have limited equipment parameters, failing to meet the current high demands of the market.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] The purpose of this invention is to provide a slitting mechanism for a roll paper bag machine, which can slit both toothed bags and flat bags, increasing the range of paper cutting lengths for the slitting blade.

[0006] This utility model provides a slitting mechanism for a roll paper bag machine, including a frame, a controller, a traction wheel assembly, a slitting wheel assembly, a pressure wheel assembly, a pressure wheel lifting and resetting assembly, an accelerating semi-rubber wheel assembly, and a paper receiving wheel assembly. The traction wheel assembly, the slitting wheel assembly, the pressure wheel assembly, the pressure wheel lifting and resetting assembly, the accelerating semi-rubber wheel assembly, and the paper receiving wheel assembly are connected to the front of the frame. The traction wheel assembly, the slitting wheel assembly, the pressure wheel assembly, the pressure wheel lifting and resetting assembly, the accelerating semi-rubber wheel assembly, and the paper receiving wheel assembly are arranged sequentially from right to left. The pressure wheel lifting and resetting assembly is connected to the pressure wheel assembly and is used to control the lifting and pressing of the pressure wheel assembly. The traction wheel assembly, the slitting wheel assembly, the pressure wheel assembly, the accelerating semi-rubber wheel assembly, and the paper receiving wheel assembly are all connected to the controller.

[0007] Furthermore, the traction wheel assembly includes an upper traction wheel, a lower traction wheel, a first servo motor, and a first forward and reverse dual-axis gearbox; the first forward and reverse dual-axis gearbox is fixed on the frame, and the output end of the first servo motor is connected to the first forward and reverse dual-axis gearbox to drive the two output shafts of the first forward and reverse dual-axis gearbox to rotate; the first servo motor is electrically connected to the controller; the two output shafts of the first forward and reverse dual-axis gearbox are respectively connected to the upper traction wheel and the lower traction wheel; the upper traction wheel and the lower traction wheel are in surface contact, and the upper traction wheel and the lower traction wheel are symmetrically arranged about the contact surface.

[0008] Furthermore, the slitting wheel assembly includes an upper slitting wheel, a lower slitting wheel, a second servo motor, and a second forward / reverse dual-axis gearbox; the second forward / reverse dual-axis gearbox is fixed on the frame, and the output end of the second servo motor is connected to the second forward / reverse dual-axis gearbox to drive the two output shafts of the second forward / reverse dual-axis gearbox to rotate; the second servo motor is electrically connected to the controller; the two output shafts of the second forward / reverse dual-axis gearbox are respectively connected to the upper slitting wheel and the lower slitting wheel; the surfaces of the upper slitting wheel and the lower slitting wheel are in contact, and the upper slitting wheel and the lower slitting wheel are symmetrically arranged about the contact surface; the surface of the upper slitting wheel is provided with a slitting protrusion, and the surface of the lower slitting wheel is provided with a slitting groove that mates with the slitting protrusion.

[0009] Further, the accelerating semi-rubber wheel assembly includes an upper accelerating wheel, a lower accelerating wheel, a third servo motor, a third forward and reverse dual-axis gearbox, a semi-rubber layer, and a cam; the third forward and reverse dual-axis gearbox is fixed on the frame, and the output end of the third servo motor is connected to the third forward and reverse dual-axis gearbox to drive the two output shafts of the third forward and reverse dual-axis gearbox to rotate; the third servo motor is electrically connected to the controller; the two output shafts of the third forward and reverse dual-axis gearbox are respectively connected to the upper accelerating wheel and the lower accelerating wheel; the surfaces of the upper accelerating wheel and the lower accelerating wheel are spaced apart, and the upper accelerating wheel and the lower accelerating wheel are symmetrically arranged vertically; the surface of the upper accelerating wheel is covered with the semi-rubber layer, the central angle of the semi-rubber layer is 90 degrees, and the thickness of the semi-rubber layer is the same as the distance between the surfaces of the upper accelerating wheel and the lower accelerating wheel; the cam is fixedly connected to the middle of the front of the lower accelerating wheel.

[0010] Further, the pressure roller assembly includes an upper pressure roller and a lower pressure roller; the pressure roller lifting and reset assembly includes a reset spring, a connecting rod, a cam rocker arm, a cam roller, and a connecting plate; the cam rocker arm is rotatably connected to the front of the frame, one end of the cam rocker arm is fixedly connected to the connecting rod and the connecting plate, the other end of the connecting rod is connected to the reset spring, and the other end of the reset spring is connected to the front of the frame; the other end of the connecting plate is rotatably connected to the upper pressure roller, the upper pressure roller is located directly above the lower pressure roller, and the lower pressure roller is rotatably connected to the front of the frame; the other end of the cam rocker arm is rotatably connected to the cam roller, the cam roller presses on the cam, and an arc-shaped groove that mates with the cam is provided on the outer side of the cam rocker arm near the cam roller.

[0011] Furthermore, the paper receiving roller assembly includes an upper paper receiving roller, a lower paper receiving roller, a fourth servo motor, and a fourth forward and reverse dual-axis gearbox; the fourth forward and reverse dual-axis gearbox is fixed on the frame, and the output end of the fourth servo motor is connected to the fourth forward and reverse dual-axis gearbox to drive the two output shafts of the fourth forward and reverse dual-axis gearbox to rotate; the fourth servo motor is electrically connected to the controller; the two output shafts of the fourth forward and reverse dual-axis gearbox are respectively connected to the upper paper receiving roller and the lower paper receiving roller; the surfaces of the upper paper receiving roller and the lower paper receiving roller are in contact, and the upper paper receiving roller and the lower paper receiving roller are symmetrically arranged about the contact surface.

[0012] Furthermore, the linear velocities of the traction wheel assembly and the pressure wheel assembly are the same.

[0013] The slitting mechanism of this utility model for a roll paper bag machine can slit both toothed bags and flat bags. A pressure roller group and a pressure roller lifting and resetting assembly are provided between the slitting roller group and the acceleration semi-rubber roller group, which increases the range of paper cutting length of the slitting knife. Attached Figure Description

[0014] Figure 1 This is a schematic planar structure diagram of the slitting mechanism for a roll paper bag machine provided in an embodiment of the present invention.

[0015] Figure 2 for Figure 1 A schematic diagram showing the use of the slitting mechanism in a roll paper bag machine.

[0016] The reference numerals and components involved in the accompanying drawings are shown below:

[0017] 1. Frame; 2. Traction wheel assembly; 21. Upper traction wheel

[0018] 22. Lower traction wheel; 23. First forward and reverse dual-shaft gearbox; 3. Splitting wheel assembly.

[0019] 31. Upper slitting wheel; 33. Second forward and reverse dual-shaft gearbox; 32. Lower slitting wheel.

[0020] 34. Cutting protrusions; 35. Cutting grooves; 4. Pressure roller assembly.

[0021] 41. Upper pressure roller 5. Pressure roller lifting and reset assembly 42. Lower pressure roller

[0022] 51. Return spring; 52. Connecting rod; 53. Cam rocker arm

[0023] 54. Cam roller; 55. Connecting plate; 56. Arc groove

[0024] 6. Accelerator half-rubber wheel set 61, upper acceleration wheel 62, lower acceleration wheel

[0025] 64. Semi-adhesive layer; 63. Third forward and reverse dual-shaft gearbox; 65. Cam.

[0026] 7. Paper receiving roller assembly 71, upper paper receiving roller 72, lower paper receiving roller

[0027] 73. Fourth forward and reverse dual-shaft gearbox Detailed Implementation

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] Example 1

[0031] Figure 1 This is a schematic plan view of the slitting mechanism for a roll paper bag machine provided in an embodiment of the present invention. Figure 2 for Figure 1 A schematic diagram illustrating the use of the slitting mechanism in a roll paper bag machine. Please refer to... Figure 1 , Figure 2 The slitting mechanism for a roll paper bag machine provided in this embodiment includes a frame 1, a controller (not shown in the figure), a traction wheel group 2, a slitting wheel group 3, a pressure wheel group 4, a pressure wheel lifting and resetting assembly 5, an accelerating semi-rubber wheel group 6, and a paper receiving wheel group 7. The traction wheel group 2, the slitting wheel group 3, the pressure wheel group 4, the pressure wheel lifting and resetting assembly 5, the accelerating semi-rubber wheel group 6, and the paper receiving wheel group 7 are connected to the front of the frame 1. The traction wheel group 2, the slitting wheel group 3, the pressure wheel group 4, the pressure wheel lifting and resetting assembly 5, the accelerating semi-rubber wheel group 6, and the paper receiving wheel group 7 are arranged sequentially from right to left. The pressure wheel lifting and resetting assembly 5 is connected to the pressure wheel group 4 and is used to control the lifting and pressing of the pressure wheel group 4. The traction wheel group 2, the slitting wheel group 3, the pressure wheel group 4, the accelerating semi-rubber wheel group 6, and the paper receiving wheel group 7 are all connected to the controller.

[0032] It should be noted that the traction wheel assembly 2 and the pressure wheel assembly 4 of this utility model have the same linear velocity.

[0033] Specifically, the traction wheel assembly 2 of this utility model includes an upper traction wheel 21, a lower traction wheel 22, a first servo motor (not shown in the figure), and a first forward and reverse dual-shaft gearbox 23; the first forward and reverse dual-shaft gearbox 23 is fixed on the frame 1, and the output end of the first servo motor is connected to the first forward and reverse dual-shaft gearbox 23 to drive the two output shafts of the first forward and reverse dual-shaft gearbox 23 to rotate; the first servo motor is electrically connected to the controller; the two output shafts of the first forward and reverse dual-shaft gearbox 23 are respectively connected to the upper traction wheel 21 and the lower traction wheel 22; the upper traction wheel 21 and the lower traction wheel 22 are in surface contact, and the upper traction wheel 21 and the lower traction wheel 22 are symmetrically arranged about the contact surface.

[0034] Specifically, the slitting wheel assembly 3 of this utility model includes an upper slitting wheel 31, a lower slitting wheel 32, a second servo motor (not shown in the figure), and a second forward and reverse dual-axis gearbox 33; the second forward and reverse dual-axis gearbox 33 is fixed on the frame 1, and the output end of the second servo motor is connected to the second forward and reverse dual-axis gearbox 33 to drive the two output shafts of the second forward and reverse dual-axis gearbox 33 to rotate; the second servo motor is electrically connected to the controller; the two output shafts of the second forward and reverse dual-axis gearbox 33 are respectively connected to the upper slitting wheel 31 and the lower slitting wheel 32; the upper slitting wheel 31 and the lower slitting wheel 32 are in surface contact, and the upper slitting wheel 31 and the lower slitting wheel 32 are symmetrically arranged about the contact surface; a slitting protrusion 34 is provided on the surface of the upper slitting wheel 31, and a slitting groove 35 that cooperates with the slitting protrusion 34 is provided on the surface of the lower slitting wheel 32.

[0035] Specifically, the acceleration semi-rubber wheel assembly 6 of this utility model includes an upper acceleration wheel 61, a lower acceleration wheel 62, a third servo motor (not shown in the figure), a third forward and reverse dual-axis gearbox 63, a semi-rubber layer 64, and a cam 65; the third forward and reverse dual-axis gearbox 63 is fixed on the frame 1, and the output end of the third servo motor is connected to the third forward and reverse dual-axis gearbox 63 to drive the two output shafts of the third forward and reverse dual-axis gearbox 63 to rotate; the third servo motor is electrically connected to the controller; the two output shafts of the third forward and reverse dual-axis gearbox 63 are... Each output shaft is connected to the upper acceleration wheel 61 and the lower acceleration wheel 62 respectively; the surfaces of the upper acceleration wheel 61 and the lower acceleration wheel 62 are spaced apart and arranged symmetrically vertically; the surface of the upper acceleration wheel 61 is covered with a semi-adhesive layer 64, the central angle of the semi-adhesive layer 64 is 90 degrees, and the thickness of the semi-adhesive layer 64 is the same as the distance between the surfaces of the upper acceleration wheel 61 and the lower acceleration wheel 62; the cam 65 is fixedly connected to the center of the front of the lower acceleration wheel 62.

[0036] Specifically, the pressure roller assembly 4 of this utility model includes an upper pressure roller 41 and a lower pressure roller 42; the pressure roller lifting and reset assembly 5 includes a reset spring 51, a connecting rod 52, a cam rocker arm 53, a cam roller 54, and a connecting plate 55; the cam rocker arm 53 is rotatably connected to the front of the frame 1, one end of the cam rocker arm 53 is fixedly connected to the connecting rod 52 and the connecting plate 55, the other end of the connecting rod 52 is connected to the reset spring 51, and the other end of the reset spring 51 is connected to the front of the frame 1; the other end of the connecting plate 55 is rotatably connected to the upper pressure roller 41, the upper pressure roller 41 is located directly above the lower pressure roller 42, and the lower pressure roller 42 is rotatably connected to the front of the frame 1; the other end of the cam rocker arm 53 is rotatably connected to the cam roller 54, the cam roller 54 presses on the cam 65, and an arc-shaped groove 56 that cooperates with the cam 65 is provided on the outer side of the cam rocker arm 53 near the cam roller 54.

[0037] Specifically, the paper receiving roller assembly 7 of this utility model includes an upper paper receiving roller 71, a lower paper receiving roller 72, a fourth servo motor (not shown in the figure), and a fourth forward and reverse dual-axis gearbox 73; the fourth forward and reverse dual-axis gearbox 73 is fixed on the frame 1, and the output end of the fourth servo motor is connected to the fourth forward and reverse dual-axis gearbox 73 to drive the two output shafts of the fourth forward and reverse dual-axis gearbox 73 to rotate; the fourth servo motor is electrically connected to the controller; the two output shafts of the fourth forward and reverse dual-axis gearbox 73 are respectively connected to the upper paper receiving roller 71 and the lower paper receiving roller 72; the upper paper receiving roller 71 and the lower paper receiving roller 72 are in surface contact, and the upper paper receiving roller 71 and the lower paper receiving roller 72 are symmetrically arranged about the contact surface.

[0038] like Figure 2 As shown, the working principle and process of the slitting mechanism of this utility model are as follows:

[0039] The principle sequence is as follows: Traction wheel group 2 pulls → Cutting wheel group 3 cuts (pressure wheel group 4 is pressed down before cutting) → Accelerating semi-rubber wheel group 6 is handed over and pulled away (at the same time, pressure wheel group 4 is lifted) → Accelerating semi-rubber wheel group 6 feeds paper and paper receiving wheel group 7 (pressure wheel group 4 is pressed down before cutting the next sheet of paper).

[0040] Specifically, driven by the first servo motor, the upper traction wheel 21 and the lower traction wheel 22 control the length of the paper being conveyed, wherein the traction wheel group 2 and the pressure wheel group 4 have the same linear speed; driven by the second servo motor, the upper slitting wheel 31 and the lower slitting wheel 32 align the slitting protrusion 34 with the slitting groove 35 to achieve precise length cutting; a cam 65 is fixedly connected to the middle of the lower acceleration wheel 62, and the paper cut by the slitting protrusion 34 and the slitting groove 35 enters the upper acceleration wheel 61 and the lower acceleration wheel 62. Between wheels 62 (at the 6 o'clock position of the lower acceleration wheel 62), the starting point of the semi-adhesive layer 64 contacts the starting point of the far end rest of the cam 65 at the same time. The cam rocker arm 53 controls the upper pressure wheel 41 to lift up. Before the far end rest of the cam 65, the semi-adhesive layer 64 only needs to pull away the paper at the tail end of the pressure wheel group 4. Before the next sheet of paper is cut, the cam 65 enters the return stroke, the return spring 51 resets, and when it enters the near end rest, the cam 65 controls the upper pressure wheel 41 to press down the paper, increasing the stability of the paper cutting.

[0041] It should be noted that, except when the paper is being transferred at different speeds (before the next sheet enters the slitting process), cam 65 controls the pressure roller group 4 to lift up, and presses the paper throughout the rest of the time. This can increase the stability of the paper cutting by the slitting protrusion 34 and the slitting groove 35, increase the range of paper cutting, and make the equipment parameters more comprehensive.

[0042] As can be seen from the above description, the advantages of this utility model are:

[0043] The slitting mechanism of this utility model for a roll paper bag machine can slit both toothed bags and flat bags. A pressure roller group and a pressure roller lifting and resetting assembly are provided between the slitting roller group and the acceleration semi-rubber roller group, which increases the range of paper cutting length of the slitting knife.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A slitting mechanism for a web sack machine, characterized in that, It includes a frame (1), a controller, a traction wheel assembly (2), a slitting wheel assembly (3), a pressure wheel assembly (4), a pressure wheel lifting and resetting assembly (5), an acceleration semi-rubber wheel assembly (6), and a paper receiving wheel assembly (7); The traction wheel assembly (2), the slitting wheel assembly (3), the pressure wheel assembly (4), the pressure wheel lifting and resetting assembly (5), the acceleration semi-rubber wheel assembly (6), and the paper receiving wheel assembly (7) are connected to the front of the frame (1); The traction wheel group (2), the cutting wheel group (3), the pressure wheel group (4), the pressure wheel lifting and resetting assembly (5), the acceleration semi-rubber wheel group (6), and the paper receiving wheel group (7) are arranged from right to left. The pressure roller lifting and resetting assembly (5) is connected to the pressure roller group (4) and is used to control the lifting and pressing of the pressure roller group (4); the traction roller group (2), the cutting roller group (3), the pressure roller group (4), the acceleration semi-rubber roller group (6) and the paper receiving roller group (7) are all connected to the controller.

2. The slitting mechanism for a web bag machine of claim 1, wherein, The traction wheel assembly (2) includes an upper traction wheel (21), a lower traction wheel (22), a first servo motor, and a first forward and reverse dual-shaft gearbox (23); The first forward and reverse dual-axis gearbox (23) is fixed on the frame (1), and the output end of the first servo motor is connected to the first forward and reverse dual-axis gearbox (23) to drive the two output shafts of the first forward and reverse dual-axis gearbox (23) to rotate; the first servo motor is electrically connected to the controller; The two output shafts of the first forward and reverse dual-shaft gearbox (23) are respectively connected to the upper traction wheel (21) and the lower traction wheel (22); The upper traction wheel (21) and the lower traction wheel (22) are in contact with each other, and the upper traction wheel (21) and the lower traction wheel (22) are symmetrically arranged about the contact surface.

3. The slitting mechanism for a web bag machine of claim 1, wherein, The slitting wheel assembly (3) includes an upper slitting wheel (31), a lower slitting wheel (32), a second servo motor, and a second forward and reverse dual-shaft gearbox (33); The second forward and reverse dual-axis gearbox (33) is fixed on the frame (1), and the output end of the second servo motor is connected to the second forward and reverse dual-axis gearbox (33) to drive the two output shafts of the second forward and reverse dual-axis gearbox (33) to rotate; the second servo motor is electrically connected to the controller; The two output shafts of the second forward and reverse dual-shaft gearbox (33) are respectively connected to the upper cutting wheel (31) and the lower cutting wheel (32); The upper cutting wheel (31) and the lower cutting wheel (32) are in contact with each other, and the upper cutting wheel (31) and the lower cutting wheel (32) are symmetrically arranged about the contact surface; the upper cutting wheel (31) is provided with a cutting protrusion (34), and the lower cutting wheel (32) is provided with a cutting groove (35) that cooperates with the cutting protrusion (34).

4. The slitting mechanism for a web bag machine of claim 1, wherein, The acceleration semi-rubber wheel assembly (6) includes an upper acceleration wheel (61), a lower acceleration wheel (62), a third servo motor, a third forward and reverse dual-shaft gearbox (63), a semi-rubber layer (64), and a cam (65); The third forward and reverse dual-axis gearbox (63) is fixed on the frame (1). The output end of the third servo motor is connected to the third forward and reverse dual-axis gearbox (63) to drive the two output shafts of the third forward and reverse dual-axis gearbox (63) to rotate. The third servo motor is electrically connected to the controller. The two output shafts of the third forward and reverse dual-shaft gearbox (63) are respectively connected to the upper acceleration wheel (61) and the lower acceleration wheel (62); The surfaces of the upper acceleration wheel (61) and the lower acceleration wheel (62) are spaced apart, and the upper acceleration wheel (61) and the lower acceleration wheel (62) are arranged symmetrically in the upper and lower positions; the surface of the upper acceleration wheel (61) is covered with the semi-adhesive layer (64), the central angle of the semi-adhesive layer (64) is 90 degrees, and the thickness of the semi-adhesive layer (64) is the same as the distance between the surfaces of the upper acceleration wheel (61) and the lower acceleration wheel (62); The cam (65) is fixedly connected to the middle part in front of the lower acceleration wheel (62).

5. The slitting mechanism for a roll paper bag machine according to claim 4, characterized in that, The pressure roller assembly (4) includes an upper pressure roller (41) and a lower pressure roller (42); the pressure roller lifting and resetting assembly (5) includes a resetting spring (51), a connecting rod (52), a cam rocker arm (53), a cam roller (54), and a connecting plate (55); The cam lever (53) is rotatably connected to the front of the frame (1). One end of the cam lever (53) is fixedly connected to the connecting rod (52) and the connecting plate (55). The other end of the connecting rod (52) is connected to the return spring (51). The other end of the return spring (51) is connected to the front of the frame (1). The other end of the connecting plate (55) is rotatably connected to the upper pressure roller (41). The upper pressure roller (41) is located directly above the lower pressure roller (42). The lower pressure roller (42) is rotatably connected to the front of the frame (1). The other end of the cam rocker arm (53) is rotatably connected to the cam roller (54), the cam roller (54) presses on the cam (65), and an arc-shaped groove (56) that cooperates with the cam (65) is provided on the outer side of the cam rocker arm (53) near the cam roller (54).

6. The slitting mechanism for a web bag machine of claim 1, wherein, The paper receiving roller assembly (7) includes an upper paper receiving roller (71), a lower paper receiving roller (72), a fourth servo motor, and a fourth forward and reverse dual-shaft gearbox (73); The fourth forward and reverse dual-axis gearbox (73) is fixed on the frame (1). The output end of the fourth servo motor is connected to the fourth forward and reverse dual-axis gearbox (73) to drive the two output shafts of the fourth forward and reverse dual-axis gearbox (73) to rotate. The fourth servo motor is electrically connected to the controller. The two output shafts of the fourth forward and reverse dual-shaft gearbox (73) are respectively connected to the upper paper receiving wheel (71) and the lower paper receiving wheel (72); The upper paper receiving wheel (71) and the lower paper receiving wheel (72) are in contact with each other, and the upper paper receiving wheel (71) and the lower paper receiving wheel (72) are symmetrically arranged about the contact surface.

7. The slitting mechanism for a roll paper bag machine according to claim 1, characterized in that, The traction wheel set (2) and the pressure wheel set (4) have the same linear velocity.

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