A paper sheet pulling-off device

Abstract

This utility model discloses a device for breaking a piece of paper with a dummy cut, comprising a first conveying mechanism and a second conveying mechanism. The first conveying mechanism has a free conveying state and a pressed state. When the first conveying mechanism is in the free conveying state, the dummy cut paper can be conveyed through the first conveying mechanism. When the first conveying mechanism is in the pressed state, the first conveying mechanism presses the dummy cut paper and breaks the first dummy cut line. The second conveying mechanism has an open / closed state and a pulling state. When the second conveying mechanism is in the open / closed state, the dummy cut paper can be conveyed through the second conveying mechanism. When the second conveying mechanism is in the pulling state and the first conveying mechanism is also in the pressed state, the second conveying mechanism presses the dummy cut paper and breaks the second dummy cut line of the dummy cut paper. This utility model breaks the first dummy cut line of the dummy cut paper by having the first conveying mechanism in the pressed state; and breaks the second dummy cut line of the dummy cut paper by having the second conveying mechanism in the pulling state while the first conveying mechanism is pressing the dummy cut paper.

Description

Technical Field

[0001] This utility model relates to the field of paper bag machine technology, and in particular to a paper tearing device for slicing paper. Background Technology

[0002] Existing paper bag machines encompass multiple processes, including material feeding, handle forming, handle cutting, handle attaching, edge gluing, partial cutting, paper bag forming, tearing, creasing, bottom opening, bottom gluing, bottom folding, and bag exit. Before the paper bag forming process, the raw material paper strip needs to be partially cut according to the dimensions of a single paper bag to facilitate subsequent paper bag forming and tearing operations.

[0003] In the food packaging industry, to ensure food cleanliness, a resealable food packaging paper bag has been designed. It forms a seal at the opening; after the food is placed inside, the release paper on the seal is peeled off and the bag is sealed. This type of paper bag requires two perforated lines to be cut into the raw paper strip, such as... Figure 1 As shown, a first dummy cutting line 31 with a length equal to the width of the raw paper strip is dummy-cut into the raw paper strip, and a second dummy cutting line 32 with a length equal to the width of the raw paper strip minus the width of the formed paper bag is dummy-cut into the raw paper strip. The raw paper strip is dummy-cut into paper strip 3. The first dummy cutting line 31 is used to break the dummy-cut paper strip for forming individual paper bags, and the second dummy cutting line 32 is used to form the cap 33. After the second dummy cutting line 32 is broken, a waste paper strip 34 is formed between the second dummy cutting line 32 and the first dummy cutting line 31, so that the remaining protruding part of the dummy-cut paper strip forms the cap 33.

[0004] Therefore, a paper-breaking device with two dummy tangent lines needs to be designed to complete the breaking process of the paper bag. Utility Model Content

[0005] This invention provides a paper-cutting and tearing device to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A paper-cutting and tearing device includes a first conveying mechanism and a second conveying mechanism; The first conveying mechanism has a free conveying state and a pressing state. When the first conveying mechanism is in the free conveying state, the dummy paper can be conveyed through the first conveying mechanism; when the first conveying mechanism is in the pressing state, the first conveying mechanism presses the dummy paper and breaks the first dummy line of the dummy paper. The second conveying mechanism includes an open / closed state and a pulling state. When the second conveying mechanism is in the open / closed state, the dummy paper can be conveyed through the second conveying mechanism. When the second conveying mechanism is in the pulling state and the first conveying mechanism is also in the pressing state, the second conveying mechanism presses down on the dummy paper and breaks the second dummy line of the dummy paper.

[0007] Preferably, the first conveying mechanism includes a first upper conveying roller and a first lower conveying roller that rotate in opposite directions. The first upper conveying roller is provided with an elastic pressure plate. When the first conveying mechanism is in a free conveying state, there is a gap between the first upper conveying roller and the first lower conveying roller to allow the paper to pass through. When the first conveying mechanism is in a pressed state, the elastic pressure plate on the first upper conveying roller rotates to a position that presses the paper to the first lower conveying roller. The linear velocity of the elastic pressure plate at the position where it contacts the paper is greater than the conveying speed of the paper to break the first dummy line of the paper.

[0008] Preferably, the first upper conveying roller is further provided with at least one pushing protrusion. The pushing protrusion has two clearance slots for the handle pasted on the dummy paper to pass through. The pushing protrusion makes way for the handle as the first upper conveying roller rotates and is used to push the dummy paper to move along the conveying direction.

[0009] Preferably, the first conveying mechanism further includes a front guide plate and a rear guide plate. The front guide plate is located on the side of the first lower conveying roller away from the second conveying mechanism, and the rear guide plate is located between the axis of the first lower conveying roller and the second conveying mechanism. The front guide plate and the rear guide plate are located between the first upper conveying roller and the first lower conveying roller.

[0010] Preferably, the first conveying mechanism further includes a mounting base, which has an inner cavity and an upper opening and a side opening. The first lower conveying roller is rotatably connected to the inner cavity of the mounting base and protrudes from the upper opening. One edge of the rear guide plate extends to the upper opening and is spaced from the outer periphery of the first lower conveying roller. The side opening is located between the first lower conveying roller and the second conveying mechanism and is located below the rear guide plate.

[0011] Preferably, the second conveying mechanism includes: a second upper conveying roller, a second lower conveying roller, and a center distance adjusting component; when the second conveying mechanism is in the open / closed state, the center distance adjusting component raises the second upper conveying roller to create a gap between the second upper conveying roller and the second lower conveying roller, allowing the dummy-cut paper to pass through; when the second conveying mechanism is in the pulling state, the center distance adjusting component lowers the second upper conveying roller to press the dummy-cut paper firmly onto the second lower conveying roller, and the linear velocity of the second lower conveying roller at the contact point with the dummy-cut paper is greater than the linear velocity of the elastic pressure plate at the contact point with the dummy-cut paper, thereby breaking the second dummy-cut line of the dummy-cut paper.

[0012] Preferably, the center distance adjustment component includes: a fixed rotating shaft, a movable rotating shaft, a connecting bracket, and a driver. The fixed rotating shaft is fixed in relative position to the second lower conveyor roller. The movable rotating shaft is mounted on the fixed rotating shaft through the connecting bracket. The driver drives the fixed rotating shaft to rotate around its own axis, thereby causing the movable rotating shaft to swing around the axis of the fixed rotating shaft to adjust the center distance between the movable rotating shaft and the second lower conveyor roller.

[0013] Preferably, the driver includes a cam assembly for switching the second conveying mechanism between an open / closed state and a pulled state as the first upper conveying roller rotates. When the first conveying mechanism is in the compressed state, the cam assembly lowers the movable shaft to keep the second conveying mechanism in the pulled state. When the first conveying mechanism switches from the pressing state to the free conveying state and the first upper conveying roller rotates at the set angle, all the broken and cut paper passes through the second conveying mechanism, and the second conveying mechanism switches to the open / closed state.

[0014] Preferably, the cam assembly includes: a cam, a roller, and a support arm; the cam rotates synchronously with the first upper conveying roller, the support arm is fixed on a fixed rotating shaft, the roller is rotatably connected to the support arm and cooperates with the cam, the rotation of the cam drives the roller to roll, thereby driving the support arm and the fixed rotating shaft to swing synchronously.

[0015] Preferably, the cam assembly further includes a resilient reset element for keeping the rollers pressed against the cam.

[0016] Beneficial effects: The paper-cutting device disclosed in this application is configured with a first conveying mechanism and a second conveying mechanism. The first conveying mechanism is in a pressing state to press the paper-cutting material and break the first dummy line of the paper-cutting material. When the first conveying mechanism presses the paper-cutting material, the second conveying mechanism is then in a pulling state to press the paper-cutting material and break the second dummy line of the paper-cutting material. Thus, the breaking process can be completed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the paper cutting method disclosed in this utility model; Figure 2 This is a schematic diagram of the structure of a paper-cutting and tearing device disclosed in this utility model; Figure 3 This is a schematic diagram of the structure of the first conveying mechanism of a paper-cutting and tearing device disclosed in this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the first conveying mechanism of a paper-cutting and tearing device disclosed in this utility model. Figure 2 ; Figure 5This is a side view of the first conveying mechanism of a paper-cutting and tearing device disclosed in this utility model; Figure 6 for Figure 5 Sectional view of AA; Figure 7 for Figure 6 Sectional view of BB; Figure 8 This is a cross-sectional view of the first conveying mechanism of the paper-cutting and tearing device disclosed in this utility model in a pressed state; Figure 9 This is a schematic diagram of the structure of the second conveying mechanism of the paper-cutting and tearing device disclosed in this utility model; Figure 10 This is a side view of the second conveying mechanism of a paper-cutting and tearing device disclosed in this utility model; Figure 11 for Figure 10 A sectional view of CC.

[0019] In the figure: 1. First conveying mechanism; 11. First upper conveying roller; 12. First lower conveying roller; 13. Elastic pressure plate; 14. Pushing protrusion; 141. Clearance slot; 15. Front guide plate; 151. Support frame; 16. Rear guide plate; 17. Mounting base; 171. Inner cavity; 172. Top opening; 173. Side opening; 18. First transmission gear set; 2. Second conveying mechanism; 21. Second upper conveying roller; 22. Second lower conveying roller; 231. Fixed rotating shaft; 232. Movable rotating shaft; 233. Connecting bracket; 234. Cam; 2341. Circular base plate; 2342. Arc-shaped plate; 235. Roller; 236. Support arm; 237. Elastic reset element; 238. Swing arm; 24. External power gear; 25. Second transmission gear set; 3. Dummy cut of paper; 31. First dummy cut line; 32. Second dummy cut line; 33. Cover; 34. Waste paper strip; 4. Frame; 5. Motor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] A paper-cutting and tearing device, combined with Figures 1-11As shown, it includes a first conveying mechanism 1 and a second conveying mechanism 2; the first conveying mechanism 1 has a free conveying state and a pressed state. When the first conveying mechanism 1 is in the free conveying state (e.g., Figure 7 As shown), the partially cut paper 3 can be conveyed through the first conveying mechanism 1; when the first conveying mechanism 1 is in a pressing state (such as... Figure 8 As shown, the first conveying mechanism 1 presses down on the partially cut paper 3 and breaks the first dummy line 31 of the partially cut paper 3; the second conveying mechanism 2 includes an open / closed state and a pulling state. When the second conveying mechanism 2 is in the open / closed state, the partially cut paper 3 can be conveyed through the second conveying mechanism 2; when the second conveying mechanism 2 is in the pulling state and the first conveying mechanism 1 is also in the pressing state, the second conveying mechanism 2 presses down on the partially cut paper 3 and breaks the second dummy line 32 of the partially cut paper 3. By setting up the first conveying mechanism 1 and the second conveying mechanism 2, when the first conveying mechanism 1 is in the free conveying state, the partially cut paper 3 is conveyed from the previous process to the next process, and the bottom end of the partially cut paper 3 corresponding to the paper bag can enter the first conveying mechanism 1 and be freely conveyed through; when the first conveying mechanism 1 is in the pressing state, the first conveying mechanism 1 presses down on the partially cut paper 3 and breaks the first dummy line 31 of the partially cut paper 3. When the first conveying mechanism 1 is in a pressing state, the second conveying mechanism 2 is also in a pulling state. The first conveying mechanism 1 presses down on the waste paper strip 34, and the second conveying mechanism 2 presses down on the dummy paper 3 and breaks the second dummy cutting line 32 of the dummy paper 3. When the first conveying mechanism 1 switches from the pressing state to the free conveying state, the second conveying mechanism 2 remains in the pulling state to continue conveying the broken section of dummy paper 3. After the broken section of dummy paper 3 has been completely conveyed through the second conveying mechanism 2, the second conveying mechanism 2 switches from the pulling state to the opening and closing state, allowing subsequent dummy paper 3 corresponding to the bottom end of the paper bag to pass through the first conveying mechanism 1 and then enter the second conveying mechanism 2 for conveying. In summary, this application can complete the breaking process of dummy paper 3 with two dummy cutting lines.

[0022] Preferably, the first conveying mechanism 1 includes a first upper conveying roller 11 and a first lower conveying roller 12 that rotate in opposite directions. An elastic pressure plate 13 is provided on the first upper conveying roller 11. When the first conveying mechanism 1 is in a free conveying state, a gap is maintained between the first upper conveying roller 11 and the first lower conveying roller 12 to allow the partially cut paper 3 to pass through. When the first conveying mechanism 1 is in a pressed state, the elastic pressure plate 13 on the first upper conveying roller 11 rotates to a position that presses the partially cut paper 3 firmly onto the first lower conveying roller 12. The linear velocity of the elastic pressure plate 13 at the contact point with the partially cut paper 3 is greater than the conveying speed of the partially cut paper 3, thus breaking the first partially cut line 31 of the partially cut paper 3. The partially cut paper 3, corresponding to the bottom end of the paper bag, enters the space between the first upper conveying roller 11 and the first lower conveying roller 12, ensuring that it can be clamped between the first lower conveying roller 12 from both the top and bottom when the elastic pressure plate 13 rotates. Since the linear velocity of the elastic pressure plate 13 at the position of contacting the dummy paper 3 is greater than the conveying speed of the dummy paper 3, the elastic pressure plate 13 will apply a certain pulling force to the dummy paper 3, thereby breaking the first dummy line 31.

[0023] Specifically, the first conveying shaft of the first upper conveying roller 11 is rotatably mounted on the frame 4 via bearings. A motor 5 is mounted on the frame 4, and the motor 5 is connected to the first conveying shaft via a coupling to drive the first upper conveying roller 11 to rotate. The first conveying shaft of the first upper conveying roller 11 and the second conveying shaft of the first lower conveying roller 12 are connected by a first transmission gear set 18.

[0024] Preferably, the first upper conveying roller 11 is further provided with at least one pushing protrusion 14. The pushing protrusion 14 has two clearance slots 141 for the handle attached to the dummy paper 3 to pass through. The pushing protrusion 14 makes way for the handle as the first upper conveying roller 11 rotates and is used to push the dummy paper 3 to move along the conveying direction. In this embodiment, there are two pushing protrusions 14, and the second pushing protrusion 14 may not have clearance slots 141. The two pushing protrusions 14 and the elastic pressure plate 13 are arranged axially and spaced apart from each other circumferentially. When the first dummy cutting line 31 is broken, the handle attached to the broken section of dummy paper 3 will be pulled out from the remaining dummy paper 3. As the first upper conveying roller 11 rotates, the two sides of the handle enter the clearance slot 141 to make way. The first pushing protrusion 14 rotates to the position of contacting the bag opening of the dummy paper 3, which can push the dummy paper 3 to continue moving along the conveying direction. The second pushing protrusion 14 rotates to the outside of the handle, which can continue to push the dummy paper 3 to move.

[0025] Specifically, the pusher 14 is a strip-shaped structure protruding from the outer circumference of a cylindrical roller. The first upper conveyor roller 11 is provided with a mounting groove, and the elastic pressure plate 13 is fixed in the mounting groove by screws. The elastic pressure plate 13 is provided with an arc-shaped surface that protrudes from the mounting groove and can abut against the first lower conveyor roller 12 to press the cut paper 3. The elastic pressure plate 13 is made of a material with high elasticity and friction coefficient, such as rubber, to facilitate the application of force to the cut paper 3.

[0026] Preferably, the first conveying mechanism 1 further includes a front guide plate 15 and a rear guide plate 16. The front guide plate 15 is located on the side of the first lower conveying roller 12 away from the second conveying mechanism 2, and the rear guide plate 16 is located between the axis of the first lower conveying roller 12 and the second conveying mechanism 2. The front guide plate 15 and the rear guide plate 16 are located between the first upper conveying roller 11 and the first lower conveying roller 12. The front guide plate 15 is used to support the cut paper 3 conveyed from the previous process and guide it between the first upper conveying roller 11 and the first lower conveying roller 12. The rear guide plate 16 is used to support a section of the cut paper 3 that has been broken off and guide it to the second conveying mechanism 2.

[0027] Preferably, the first conveying mechanism 1 further includes a mounting base 17, which has an inner cavity 171 and an upper opening 172 and a side opening 173. The first lower conveying roller 12 is rotatably connected to the inner cavity 171 of the mounting base 17 and protrudes from the upper opening 172. One edge of the rear guide plate 16 extends to the upper opening 172 and leaves a gap with the outer periphery of the first lower conveying roller 12. The side opening 173 is located between the first lower conveying roller 12 and the second conveying mechanism 2 and is located below the rear guide plate 16. A section of diced paper 3 that has been broken off continues to be conveyed under the guidance of the rear guide plate 16. The waste paper strip 34 left after the second diced line 32 is broken off enters the inner cavity 171 from the gap between the rear guide plate 16 and the outer periphery of the first lower conveying roller 12 as the first lower conveying roller 12 rotates, and is then discharged from the side opening 173.

[0028] Specifically, the mounting base 17 is installed on the frame 4 by screws, and support frames 151 are provided on both its front and rear sides. The support frames 151 are also installed on the frame 4 and are used to install the front guide plate 15 and the rear guide plate 16. The front guide plate 15 and the rear guide plate 16 are provided with inclined parts to accommodate the fall of the paper 3 being cut and to ensure the guiding effect.

[0029] Preferably, the second conveying mechanism 2 includes: a second upper conveying roller 21, a second lower conveying roller 22, and a center distance adjusting component; when the second conveying mechanism 2 is in the open / closed state, the center distance adjusting component raises the second upper conveying roller 21 to create a gap between the second upper conveying roller 21 and the second lower conveying roller 22, allowing the partially cut paper 3 to pass through; when the second conveying mechanism 2 is in the pulling state, the center distance adjusting component lowers the second upper conveying roller 21 to press the partially cut paper 3 onto the second lower conveying roller 22, and the linear velocity of the second lower conveying roller 22 at the contact position with the partially cut paper 3 is greater than the linear velocity of the elastic pressure plate 13 at the contact position with the partially cut paper 3, thereby breaking the second partially cut line 32 of the partially cut paper 3. The gap between the bottom end of the paper bag and the second upper conveyor roller 21 and the second lower conveyor roller 22 is maintained at which the paper bag 3 is cut. This ensures that when the second conveying mechanism 2 is in a pulling state, the second upper conveyor roller 21 and the second lower conveyor roller 22 can clamp the paper bag 3 from both the top and bottom. At this time, the first upper conveyor roller 11 and the first lower conveyor roller 12 clamp the waste paper strip 34. Since the linear velocity of the second lower conveyor roller 22 at the position where it contacts the paper bag 3 is greater than the linear velocity of the elastic pressure plate 13 at the position where it contacts the paper bag 3, the second lower conveyor roller 22 will apply a certain pulling force to the paper bag 3, thereby breaking the second cut line 32 and causing the waste paper strip 34 to detach.

[0030] Specifically, the third conveying shaft of the second lower conveying roller 22 is rotatably mounted on the frame 4 via bearings. The third conveying shaft is connected to an external power source via an external power gear 24. For example, the external power gear 24 and the conveying motor of the paper bag machine are connected via gears.

[0031] Preferably, the center distance adjustment component includes: a fixed rotating shaft 231, a movable rotating shaft 232, a connecting bracket 233, and a driver. The fixed rotating shaft 231 is fixed in relative position to the second lower conveying roller 22. The movable rotating shaft 232 is mounted on the fixed rotating shaft 231 through the connecting bracket 233. The driver drives the fixed rotating shaft 231 to rotate around its own axis, thereby causing the movable rotating shaft 232 to swing around the axis of the fixed rotating shaft 231 to adjust the center distance between the movable rotating shaft 232 and the second lower conveying roller 22.

[0032] Specifically, the fixed rotating shaft 231 is rotatably mounted on the frame 4 via bearings, and each end of the movable rotating shaft 232 is rotatably connected to a connecting bracket 233 via bearings. The connecting bracket 233 is clamped onto the fixed rotating shaft 231 using a shaft clamp. Rotation of the fixed rotating shaft 231 drives the connecting brackets 233, thereby causing the movable rotating shaft 232 to swing around the axis of the fixed rotating shaft 231. Transmission between the movable rotating shaft 232 and the third conveying shaft is achieved through a second transmission gear set 25.

[0033] Preferably, the driver includes a cam assembly for switching the second conveying mechanism 2 between an open / closed state and a pulling state as the first upper conveying roller 11 rotates. When the first conveying mechanism 1 is in the pressing state, the cam assembly causes the movable rotating shaft 232 to be lowered to keep the second conveying mechanism 2 in the pulling state; after the first conveying mechanism 1 breaks the first dummy cutting line 31, the first upper conveying roller 11 continues to rotate, so that the elastic pressure plate 13 presses the waste paper strip 34 of the dummy paper 3; the second conveying mechanism 2 then breaks the second dummy cutting line 32. When the first conveying mechanism 1 switches from the pressing state to the free conveying state and the first upper conveying roller 11 rotates to the set angle, all the broken and cut paper 3 passes through the second conveying mechanism 2. The second conveying mechanism 2 switches to the open and closed state so that the cut paper 3 that has passed through the first conveying mechanism 1 can enter between the second upper conveying roller 21 and the second lower conveying roller 22.

[0034] Preferably, the cam assembly includes a cam 234, a roller 235, and a support arm 236. The cam 234 rotates synchronously with the first upper conveying roller 11. The support arm 236 is fixed on the fixed rotating shaft 231. The roller 235 is rotatably connected to the support arm 236 and cooperates with the cam 234. The rotation of the cam 234 drives the roller 235 to roll, thereby driving the support arm 236 and the fixed rotating shaft 231 to swing synchronously.

[0035] Specifically, the cam 234 includes a circular base disk 2341 and an arc-shaped plate 2342. The circular base disk 2341 is coaxially sleeved on the first conveying shaft. The arc-shaped plate 2342 is fixed to the circular base disk 2341 by screws. The outer arc surface of the arc-shaped plate 2342 protrudes from the outer circumferential surface of the circular base disk 2341, and the outer arc surface of the arc-shaped plate 2342 is machined with a bevel for the transition between the outer arc surface of the arc-shaped plate 2342 and the outer circumferential surface of the circular base disk 2341. The support arm 236 is clamped to the fixed rotating shaft 231 by a shaft clamp. The support arm 236 is provided with two rollers 235, one roller 235 corresponding to the outer circumferential surface of the circular base disk 2341 and the other roller 235 corresponding to the outer arc surface of the arc-shaped plate 2342. Roller 235 rolls against the outer circumference of circular base plate 2341, causing support arm 236 to fall down, thereby causing movable shaft 232 to fall down; roller 235 rolls against the outer arc surface of arc plate 2342, causing support arm 236 to rise up, thereby causing movable shaft 232 to rise up.

[0036] Preferably, the cam assembly further includes an elastic reset member 237, which is used to make the roller 235 adhere to the cam 234.

[0037] Specifically, a swing arm 238 is fixed on the fixed rotating shaft 231. The swing arm 238 is clamped to the fixed rotating shaft 231 by a shaft clamp. The elastic reset element 237 is a tension spring. One end of the tension spring is hooked on the connecting pin on the swing arm 238, and the other end is hooked on the connecting bolt installed on the frame 4. When the support arm 236 drives the fixed rotating shaft 231 to rotate counterclockwise, the swing arm 238 swings counterclockwise. The tension spring generates tension, causing the roller 235 to roll against the outer arc surface of the arc plate 2342. After rotating past the arc plate 2342, under the action of the tension spring, the roller 235 rolls against the outer circumferential surface of the circular base plate 2341, thereby realizing the reset of the swing arm 238.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A paper-cutting and tearing device, characterized in that, Includes a first conveying mechanism (1) and a second conveying mechanism (2); The first conveying mechanism (1) has a free conveying state and a pressing state. When the first conveying mechanism (1) is in the free conveying state, the dummy paper (3) can be conveyed through the first conveying mechanism (1); when the first conveying mechanism (1) is in the pressing state, the first conveying mechanism (1) presses the dummy paper (3) and breaks the first dummy cutting line (31) of the dummy paper (3). The second conveying mechanism (2) includes an open / closed state and a pulling state. When the second conveying mechanism (2) is in the open / closed state, the dummy paper (3) can be conveyed through the second conveying mechanism (2). When the second conveying mechanism (2) is in the pulling state and the first conveying mechanism (1) is also in the pressing state, the second conveying mechanism (2) presses down the dummy paper (3) and pulls off the second dummy cutting line (32) of the dummy paper (3).

2. The paper-cutting and tearing device according to claim 1, characterized in that, The first conveying mechanism (1) includes a first upper conveying roller (11) and a first lower conveying roller (12) that rotate in opposite directions. An elastic pressure plate (13) is provided on the first upper conveying roller (11). When the first conveying mechanism (1) is in a free conveying state, there is a gap between the first upper conveying roller (11) and the first lower conveying roller (12) to allow the dummy paper (3) to pass through. When the first conveying mechanism (1) is in a pressing state, the elastic pressure plate (13) on the first upper conveying roller (11) rotates to the position that presses the dummy paper (3) onto the first lower conveying roller (12). The linear velocity of the elastic pressure plate (13) at the position where it contacts the dummy paper (3) is greater than the conveying speed of the dummy paper (3) to break the first dummy line (31) of the dummy paper (3).

3. The paper-cutting and tearing device according to claim 2, characterized in that, The first upper conveying roller (11) is also provided with at least one pusher (14), and the pusher (14) has two clearance slots (141) for the handle pasted on the dummy paper (3) to pass through. The pusher (14) makes way for the handle as the first upper conveying roller (11) rotates and is used to push the dummy paper (3) to move along the conveying direction.

4. The paper-cutting and tearing device according to claim 3, characterized in that, The first conveying mechanism (1) further includes a front guide plate (15) and a rear guide plate (16). The front guide plate (15) is located on the side of the first lower conveying roller (12) away from the second conveying mechanism (2). The rear guide plate (16) is located between the axis of the first lower conveying roller (12) and the second conveying mechanism (2). The front guide plate (15) and the rear guide plate (16) are located between the first upper conveying roller (11) and the first lower conveying roller (12).

5. The paper-cutting and tearing device according to claim 4, characterized in that, The first conveying mechanism (1) further includes a mounting base (17), which has an inner cavity (171) and an upper opening (172) and a side opening (173). The first lower conveying roller (12) is rotatably connected to the inner cavity (171) of the mounting base (17) and protrudes from the upper opening (172). One edge of the rear guide plate (16) extends to the upper opening (172) and is spaced from the outer periphery of the first lower conveying roller (12). The side opening (173) is located between the first lower conveying roller (12) and the second conveying mechanism (2) and is located below the rear guide plate (16).

6. The paper-cutting and tearing device according to claim 5, characterized in that, The second conveying mechanism (2) includes: a second upper conveying roller (21), a second lower conveying roller (22), and a center distance adjustment component; when the second conveying mechanism (2) is in the open / closed state, the center distance adjustment component raises the second upper conveying roller (21) so that there is a gap between the second upper conveying roller (21) and the second lower conveying roller (22) for the paper (3) to pass through; when the second conveying mechanism (2) is in the pulling state, the center distance adjustment component lowers the second upper conveying roller (21) so that the second upper conveying roller (21) presses the paper (3) onto the second lower conveying roller (22), and the linear velocity of the second lower conveying roller (22) at the position of contacting the paper (3) is greater than the linear velocity of the elastic pressure plate (13) at the position of contacting the paper (3) to break the second dummy line (32) of the paper (3).

7. The paper-cutting and tearing device according to claim 6, characterized in that, The center distance adjustment component includes: a fixed rotating shaft (231), a movable rotating shaft (232), a connecting bracket (233), and a driver. The fixed rotating shaft (231) is fixed in relative position to the second lower conveying roller (22). The movable rotating shaft (232) is mounted on the fixed rotating shaft (231) through the connecting bracket (233). The driver drives the fixed rotating shaft (231) to rotate around its own axis, thereby causing the movable rotating shaft (232) to swing around the axis of the fixed rotating shaft (231) to adjust the center distance between the movable rotating shaft (232) and the second lower conveying roller (22).

8. The paper-cutting and tearing device according to claim 7, characterized in that, The driver includes a cam assembly for switching the second conveying mechanism (2) between an open / closed state and a pulling state as the first upper conveying roller (11) rotates; When the first conveying mechanism (1) is in a pressed state, the cam assembly causes the movable shaft (232) to fall down to keep the second conveying mechanism (2) in a pulled state; When the first conveying mechanism (1) switches from the pressing state to the free conveying state and the rotation angle of the first upper conveying roller (11) is set, all the broken and cut paper (3) passes through the second conveying mechanism (2), and the second conveying mechanism (2) switches to the open and closed state.

9. A paper-cutting and tearing device according to claim 8, characterized in that, The cam assembly includes a cam (234), a roller (235), and a support arm (236). The cam (234) rotates synchronously with the first upper conveying roller (11). The support arm (236) is fixed on a fixed rotating shaft (231). The roller (235) is rotatably connected to the support arm (236) and the roller (235) cooperates with the cam (234). The rotation of the cam (234) drives the roller (235) to roll, thereby driving the support arm (236) and the fixed rotating shaft (231) to swing synchronously.

10. A paper-cutting and tearing device according to claim 9, characterized in that, The cam assembly also includes a resilient reset member (237) for causing the roller (235) to press against the cam (234).

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