Double-layer paper feeding switching device

Abstract

The utility model discloses a double-layer paper feeding switching device which comprises a machine frame, a lifting seat is arranged on the machine frame, the double-layer paper feeding switching device further comprises two paper feeding mechanisms, and the paper feeding mechanisms and the lifting seat are relatively fixed in the vertical direction. Lifting racks are fixedly connected to the left side and the right side of the lifting seat, a first transmission shaft is rotationally connected to the rack, two lifting gears are fixedly connected to the first transmission shaft and are in one-to-one meshing connection with the two lifting racks correspondingly, and two lifting driving air cylinders are further connected to the rack; an output shaft of the lifting driving air cylinder is connected with the lifting rack. According to the scheme, the two lifting driving cylinders drive the lifting racks located on the two sides to move up and down, and the two lifting gears are connected through the transmission shaft, so that the two lifting driving cylinders synchronously drive the double-layer paper feeding mechanism to move up and down to switch the position, and it can be guaranteed that the two sides of the paper feeding mechanism move synchronously to avoid jamming and inclination; compared with motor driving, the cost is lower, and the control is simpler.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging carton production equipment, in particular to a double-layer paper feeding switching device. Background Art

[0002] With the rapid development of the logistics industry, the current demand for personalized small-batch packaging cartons is increasing. Some existing automatic carton cutting equipment can cut cardboard of corresponding sizes according to the size of the required cartons. Such equipment usually has multiple paper bins and multi-layer paper feeding mechanisms. Different-sized cardboard is stored in multiple paper bins respectively to adapt to the size of the required cartons and reduce waste. Each paper bin corresponds to a paper feeding mechanism, and the multi-layer paper feeding mechanism is driven by a lifting mechanism to move up and down to switch and correspond to the paper cutting platform. The current lifting mechanism drives the multi-layer paper feeding mechanism to move up and down through a motor. However, when there are only two layers of paper feeding mechanisms, the cost of using a motor drive is relatively high and the control is relatively complex. Summary of the Utility Model

[0003] The main object of the utility model is to propose a double-layer paper feeding switching device, aiming to solve the technical problems of relatively high cost and relatively complex control in the prior art when using a motor to drive the switching of the paper feeding mechanism.

[0004] To achieve the above object, the utility model proposes a double-layer paper feeding switching device, including a frame. A lifting seat is arranged on the frame, and the lifting seat can move up and down relative to the frame. The double-layer paper feeding switching device further includes two paper feeding mechanisms. The two paper feeding mechanisms are arranged vertically. The paper feeding mechanism and the lifting seat are relatively fixed in the vertical direction.

[0005] Lifting racks extending in the vertical direction are fixedly connected to both the left and right sides of the lifting seat. A first transmission shaft extending in the left-right direction is rotatably connected to the frame. Two lifting gears are fixedly connected to the first transmission shaft. The two lifting gears are respectively meshed and connected with the two lifting racks. Two lifting driving cylinders are further connected to the frame. The output shafts of the two lifting driving cylinders are respectively connected to the two lifting racks. The lifting driving cylinder can drive the lifting rack to move up and down.

[0006] The lifting seat is provided with two layers of paper feeding mechanisms. Two lifting drive cylinders drive two lifting racks to move up and down respectively, so as to realize the up and down movement of the lifting seat and the two layers of paper feeding mechanisms to switch positions. Due to factors such as asynchronous air volume or unstable air pressure during the operation of the two lifting drive cylinders, two lifting gears are connected by a first transmission shaft, so that the left and right sides of the two lifting racks, the left and right sides of the lifting seat, and the left and right sides of the paper feeding mechanism can move up and down synchronously, so as to prevent the up and down movement of the lifting seat and the two paper feeding mechanisms from jamming and tilting due to the asynchronous movement of the two lifting drive cylinders, which affects the paper feeding process. This solution drives the double-layer paper feeding mechanism to move up and down to switch positions through the lifting drive cylinder, and the structure of the lifting gear and the lifting rack can ensure the synchronous movement of both sides of the paper feeding mechanism to prevent jamming and tilting. Compared with the motor drive, the cost is lower and the control is simpler.

[0007] Preferably, two fixed seats are fixedly connected to the frame. The two fixed seats are respectively arranged on the left side and the right side of the lifting seat. The fixed seats are fixedly connected with lifting guide rails extending in the up and down direction. Lifting plates are arranged on the left and right sides of the lifting seat. The two lifting plates are respectively slidably connected with the lifting guide rails on the two fixed seats. The lifting rack is fixedly connected to the corresponding lifting plate. The lifting seat is slidably connected with the fixed seat through the lifting guide rail, making the movement more stable.

[0008] Preferably, the paper feeding mechanism includes a paper feeding seat. The left and right sides of the paper feeding seat are respectively slidably connected with the left and right sides of the lifting seat in the front and back direction. A pushing mechanism is further arranged on the frame. The pushing mechanism is arranged in a position-matching manner with the two paper feeding seats. The lifting drive cylinder can drive the two paper feeding seats to move up and down to switch to face the pushing mechanism, and the pushing mechanism can drive the facing paper feeding seat to move back and forth.

[0009] The paper feeding seat is slidably connected with the lifting seat in the front and back direction. One of the paper feeding mechanisms that moves up and down to face the pushing mechanism can move back and forth under the drive of the pushing mechanism for paper cutting use.

[0010] Preferably, the pushing mechanism includes two pushing seats which can move back and forth relative to the frame. The two pushing seats are respectively arranged on the left and right sides of the paper feeding mechanism. A pushing member is fixedly connected to each pushing seat. The pushing members of the two pushing seats are respectively arranged in a position-matching manner with the left and right sides of the paper feeding seat. The pushing mechanism drives the corresponding paper feeding seat to move back and forth through the pushing member. Two pushing racks extending in the front-back direction are fixedly connected to the two pushing seats respectively. A second transmission shaft extending in the left-right direction is rotatably connected to the frame. Two pushing gears are fixedly connected to the second transmission shaft. The two pushing gears are respectively engaged with the two pushing racks. The pushing mechanism further includes a pushing driving cylinder connected to the frame. The output shaft of the pushing driving cylinder is connected to at least one of the pushing racks. The pushing driving cylinder can drive the pushing rack to move back and forth.

[0011] The two pushing seats are respectively arranged on the left and right sides of the paper feeding mechanism. The pushing driving cylinder drives the pushing rack, the pushing seat and the pushing member to move back and forth. The back-and-forth movement of the pushing rack drives the pushing gear to rotate. Since the two pushing gears are connected by the second transmission shaft, the two pushing racks and the two pushing seats can move back and forth synchronously, so that the left and right sides of the paper feeding mechanism can move back and forth synchronously, preventing the left and right sides of the paper feeding mechanism from tilting and shifting back and forth.

[0012] Preferably, the number of the pushing driving cylinders is two. The output shafts of the two pushing driving cylinders are respectively connected to the two pushing racks one by one.

[0013] The two pushing driving cylinders respectively drive the two pushing racks, which can directly drive the pushing seats on the left and right sides, making the movement smoother. And under the mutual restriction of the two pushing racks, the two pushing gears and the second transmission shaft, the action speeds of the two pushing driving cylinders can also be kept the same.

[0014] Preferably, two fixing seats are fixedly connected to the frame. The two fixing seats are respectively arranged on the left and right sides of the lifting seat. The left and right sides of the lifting seat are respectively slidably connected to the lifting guide rails on the two fixing seats. The fixing seats are provided with lifting limit grooves extending in the up-down direction. Positioning members are arranged at both the left and right ends of the paper feeding seat. The positioning members are arranged in the corresponding lifting limit grooves and can slide up and down along the lifting limit grooves. A pushing notch for the corresponding pushing member to pass through is arranged in the middle of the lifting limit groove. A pushing groove corresponding to the position of the lifting limit groove is arranged on the pushing member. When the pushing member is inserted into the pushing notch, the pushing groove is aligned with the lifting limit groove. The positioning member can enter the pushing groove and be driven to move back and forth by the pushing member.

[0015] When the lifting seat and the paper feeding mechanism move up and down, the pushing member is in the position of inserting into the pushing notch, the pushing groove of the pushing member is exactly opposite to the lifting limit groove, and the positioning member of the paper feeding seat can slide up and down in the lifting limit groove and the pushing groove; when one of the paper feeding mechanisms moves up and down to the in-place position, the positioning member of this paper feeding mechanism stops in the pushing groove, the pushing driving cylinder drives the pushing member to move, and the pushing member drives the positioning member and the paper feeding seat to move, so as to push out the paper feeding mechanism that has moved up and down to the in-place position, while the positioning member of the other paper feeding mechanism is in the lifting limit groove, and the lifting limit groove restricts its front and rear positions from being pushed out.

[0016] Preferably, the paper feeding mechanism further includes a paper guiding member and a paper pressing mechanism. The paper guiding member is fixedly connected to the left and right sides of the paper feeding seat. The paper guiding member is provided with a paper guiding groove. The paper pressing mechanism is arranged on the upper side of the paper guiding member, and the paper pressing mechanism can press the paper on the paper guiding member.

[0017] The paper guiding groove of the paper guiding member can support and guide the cardboard; when conveying the cardboard, the paper pressing mechanism is loosened, and the cardboard can be conveyed to the cutting position; when it is necessary to switch the position of the paper feeding mechanism or push out the paper feeding mechanism, the paper pressing member can press the cardboard on the paper guiding member to position the cardboard. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a schematic structural diagram of the connection part of the lifting driving cylinder, the lifting seat, the lifting rack and the lifting gear of the present invention;

[0021] Figure 3 is a schematic structural diagram of the pushing mechanism part of the present invention;

[0022] Figure 4 is a schematic structural diagram of the fixed seat, the lifting limit groove and the pushing member of the present invention;

[0023] Figure 5 is a schematic structural diagram of the paper feeding mechanism of the present invention.

[0024] In the accompanying drawings: 1 - frame, 21 - lifting seat, 211 - lifting plate, 22 - lifting rack, 23 - first transmission shaft, 24 - lifting gear, 25 - lifting drive cylinder, 3 - paper feeding mechanism, 31 - paper feeding seat, 311 - positioning member, 32 - paper guiding member, 321 - paper guiding groove, 33 - paper pressing mechanism, 4 - fixed seat, 41 - lifting guide rail, 42 - lifting limit groove, 421 - pushing notch, 5 - pushing mechanism, 51 - pushing seat, 52 - pushing member, 521 - pushing groove, 53 - pushing rack, 54 - second transmission shaft, 55 - pushing gear, 56 - pushing drive cylinder.

[0025] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0027] It should be noted that if there are directional indications involved in the embodiments of the present utility model, such as up, down, left, right, front, back, etc., then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then such directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0029] As Figures 1 to 5 shown, a double-layer paper feeding switching device includes a frame 1, a lifting seat 21 is provided on the frame 1, the lifting seat 21 can move up and down relative to the frame 1, the double-layer paper feeding switching device further includes two paper feeding mechanisms 3, the two paper feeding mechanisms 3 are arranged up and down, and the paper feeding mechanism 3 is relatively fixed to the lifting seat 21 in the up and down direction;

[0030] On the left and right sides of the lifting seat 21, there are fixedly connected lifting racks 22 extending in the up and down direction. On the frame 1, there is a first transmission shaft 23 rotatably connected and extending in the left and right direction. On the first transmission shaft 23, there are fixedly connected two lifting gears 24. The two lifting gears 24 are respectively in one-to-one meshing connection with the two lifting racks 22. On the frame 1, there are also connected two lifting driving cylinders 25. The output shafts of the two lifting driving cylinders 25 are respectively connected to the two lifting racks 22 one by one. The lifting driving cylinder 25 can drive the lifting rack 22 to move up and down.

[0031] On the lifting seat 21, there are upper and lower two-layer paper feeding mechanisms 3. By respectively driving the two lifting racks 22 to move up and down through the two lifting driving cylinders 25, the up and down movement of the lifting seat 21 and the two-layer paper feeding mechanism 3 is switched in position. Due to factors such as different air volumes or unstable air pressures during the operation of the two lifting driving cylinders 25, two lifting gears 24 are connected by a first transmission shaft 23. The two lifting gears 24 and the first transmission shaft 23 enable the two lifting racks 22 and the two lifting driving cylinders 25 to move synchronously. In this way, the left and right sides of the two lifting racks 22, the left and right sides of the lifting seat 21, and the left and right sides of the paper feeding mechanism 3 can move up and down synchronously, so as to prevent the up and down movement of the lifting seat 21 and the two paper feeding mechanisms 3 from getting stuck and tilted due to the asynchronous movement of the two lifting driving cylinders 25, which affects the paper feeding process. In this solution, the double-layer paper feeding mechanism 3 is driven by the lifting driving cylinder 25 to move up and down to switch positions, and the structure of the lifting gear 24 and the lifting rack 22 can ensure the synchronous movement of both sides of the paper feeding mechanism 3 to avoid getting stuck and tilted. Compared with using a motor drive, the cost is lower and the control is simpler.

[0032] In some specific embodiments, there are fixedly connected two fixed seats 4 on the frame 1. The two fixed seats 4 are respectively arranged on the left and right sides of the lifting seat 21. On the fixed seat 4, there is fixedly connected a lifting guide rail 41 extending in the up and down direction. On the left and right sides of the lifting seat 21, there are lifting plates 211. The two lifting plates 211 are respectively slidably connected to the lifting guide rails 41 on the two fixed seats 4. The lifting rack 22 is fixedly connected to the corresponding lifting plate 211. The lifting seat 21 is slidably connected to the fixed seat 4 through the lifting guide rail 41, making the movement more stable.

[0033] In some specific embodiments, the paper feeding mechanism 3 includes a paper feeding seat 31. The left and right sides of the paper feeding seat 31 are respectively slidably connected to the left and right sides of the lifting seat 21 in the front and back direction. Specifically, the left and right sides of the paper feeding seat 31 can be slidably connected to the two lifting plates 211. On the frame 1, there is also a pushing mechanism 5. The pushing mechanism 5 is arranged in a position-matching manner with the two paper feeding seats 31. The lifting driving cylinder 25 can drive the two paper feeding seats 31 to move up and down to switch to face the pushing mechanism 5. The pushing mechanism 5 can drive the facing paper feeding seat 31 to move back and forth.

[0034] The paper feeding mechanism 3 is slidably connected to the lifting seat 21 along the front-back direction through the paper feeding base 31. The paper feeding mechanism 3 that moves up and down to face the pushing mechanism 5 can move back and forth under the drive of the pushing mechanism 5. When pushing forward, it is used for paper cutting. When it is necessary to switch to another paper feeding mechanism 3, it moves backward to reset and then performs lifting movement.

[0035] Further, referring to Figure 3 , the pushing mechanism 5 includes two pushing seats 51. The pushing seats 51 can move back and forth relative to the frame 1. The two pushing seats 51 are respectively arranged on the left and right sides of the paper feeding mechanism 3. A pushing member 52 is fixedly connected to the pushing seat 51. The pushing members 52 of the two pushing seats 51 are respectively arranged in a position-matching manner with the left and right sides of the paper feeding base 31. The pushing mechanism 5 drives the facing paper feeding base 31 to move back and forth through the pushing member 52; Two pushing racks 53 extending along the front-back direction are fixedly connected to both pushing seats 51. A second transmission shaft 54 extending along the left-right direction is rotatably connected to the frame 1. Two pushing gears 55 are fixedly connected to the second transmission shaft 54. The two pushing gears 55 are respectively engaged with the two pushing racks 53 one by one. The pushing mechanism 5 further includes a pushing drive cylinder 56. The pushing drive cylinder 56 is connected to the frame 1. The output shaft of the pushing drive cylinder 56 is connected to at least one pushing rack 53. The pushing drive cylinder 56 can drive the pushing rack 53 to move back and forth.

[0036] The two pushing seats 51 are respectively arranged on the left and right sides of the paper feeding mechanism 3. When a paper feeding mechanism 3 moves up and down to face the pushing member 52, the pushing drive cylinder 56 can drive the pushing rack 53, the pushing seat 51 and the pushing member 52 to move back and forth. The back-and-forth movement of the pushing rack 53 drives the pushing gear 55 to rotate. Since the two pushing gears 55 are connected by the second transmission shaft 54, the two pushing racks 53 and the two pushing seats 51 can move back and forth synchronously, so that the left and right sides of the paper feeding mechanism 3 can move back and forth synchronously, so as to prevent the left and right sides of the paper feeding mechanism 3 from tilting and shifting back and forth. The cost of using the pushing drive cylinder 56 is relatively low and the control is simpler.

[0037] Further, the number of the pushing drive cylinders 56 is two. The output shafts of the two pushing drive cylinders 56 are respectively connected to the two pushing racks 53 one by one.

[0038] The two pushing drive cylinders 56 respectively drive the two pushing racks 53, which can directly act on the pushing seat 51 on the left and right sides, and the action is smoother. And under the mutual restriction of the two pushing racks 53, the two pushing gears 55 and the second transmission shaft 54, the action speeds of the two pushing drive cylinders 56 can also be kept the same.

[0039] In some specific embodiments, referring to Figure 4, the fixed seat 4 is provided with a lifting limit groove 42 extending in the up and down direction. Positioning members 311 are provided at both the left and right ends of the paper feeding seat 31. The positioning members 311 are arranged in the corresponding lifting limit grooves 42 and can slide up and down along the lifting limit grooves 42. The middle part of the lifting limit groove 42 is disconnected and provided with a pushing gap 421 for the corresponding pushing member 52 to pass through. A pushing groove 521 corresponding to the position of the lifting limit groove 42 is provided on the pushing member 52. When the pushing member 52 is inserted into the pushing gap 421, the pushing groove 521 is directly opposite to the lifting limit groove 42, and the positioning member 311 can enter the pushing groove 521 and be driven by the pushing member 52 to move back and forth.

[0040] When the lifting seat 21 and the paper feeding mechanism 3 move up and down, the pushing member 52 is in the position of being inserted into the pushing gap 421, the pushing groove 521 of the pushing member 52 is directly opposite to the lifting limit groove 42, and the positioning member 311 of the paper feeding seat 31 can slide up and down in the lifting limit groove 42 and the pushing groove 521, ensuring that the paper feeding mechanism 3 does not move back and forth during the process of moving up and down; when one of the paper feeding mechanisms 3 moves up and down in place, the positioning member 311 of this paper feeding mechanism 3 stops in the pushing groove 521, the pushing driving cylinder 56 drives the pushing member 52 to move, the pushing member 52 drives the positioning member 311 and the paper feeding seat 31 to move, so as to push out the paper feeding mechanism 3 that has moved up and down in place, while the positioning member 311 of the other paper feeding mechanism 3 is in the lifting limit groove 42, and the lifting limit groove 42 restricts its front and back positions from being pushed out.

[0041] In some specific embodiments, referring to Figure 5 , the paper feeding mechanism 3 further includes a paper guiding member 32 and a paper pressing mechanism 33. The paper guiding member 32 is fixedly connected to both the left and right sides of the paper feeding seat 31. A paper guiding groove 321 is provided on the paper guiding member 32. The paper pressing mechanism 33 is arranged on the upper side of the paper guiding member 32, and the paper pressing mechanism 33 can press the paper on the paper guiding member 32.

[0042] The paper guiding grooves 321 of the paper guiding members 32 located on both sides face the middle. The paper guiding grooves 321 can support and guide the cardboard; when conveying the cardboard, the paper pressing mechanism 33 is loosened, and the cardboard can be conveyed to the cutting position; when it is necessary to switch the position of the paper feeding mechanism 3 or push out the paper feeding mechanism 3, the paper pressing member can press the cardboard on the paper guiding member 32 to position the cardboard. The paper pressing mechanism 33 can adopt a cylinder.

[0043] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A double-layer paper feeding switching device, characterized in that It includes a frame (1), on which a lifting seat (21) is provided. The lifting seat (21) can move up and down relative to the frame (1). The double-layer paper feeding switching device further includes two paper feeding mechanisms (3). The two paper feeding mechanisms (3) are arranged vertically, and the paper feeding mechanism (3) is relatively fixed to the lifting seat (21) in the vertical direction. On the left and right sides of the lifting seat (21), there are fixedly connected lifting racks (22) extending in the vertical direction. On the frame (1), a first transmission shaft (23) extending in the left-right direction is rotatably connected. On the first transmission shaft (23), two lifting gears (24) are fixedly connected. The two lifting gears (24) are respectively engaged with the two lifting racks (22). On the frame (1), two lifting driving cylinders (25) are also connected. The output shafts of the two lifting driving cylinders (25) are respectively connected to the two lifting racks (22). The lifting driving cylinder (25) can drive the lifting rack (22) to move up and down.

2. The double-layer paper feeding switching device according to claim 1, wherein On the frame (1), two fixed seats (4) are fixedly connected. The two fixed seats (4) are respectively arranged on the left and right sides of the lifting seat (21). On the fixed seat (4), a lifting guide rail (41) extending in the vertical direction is fixedly connected. On the left and right sides of the lifting seat (21), there are lifting plates (211). The two lifting plates (211) are respectively slidably connected to the lifting guide rails (41) on the two fixed seats (4). The lifting rack (22) is fixedly connected to the corresponding lifting plate (211).

3. The double-layer paper feeding switching device according to claim 1, wherein: The paper feeding mechanism (3) includes a paper feeding seat (31). The left and right sides of the paper feeding seat (31) are respectively slidably connected to the left and right sides of the lifting seat (21) in the front-rear direction. On the frame (1), a pushing mechanism (5) is also provided. The pushing mechanism (5) is arranged in a position-matching manner with the two paper feeding seats (31). The lifting driving cylinder (25) can drive the two paper feeding seats (31) to move up and down to switch to face the pushing mechanism (5). The pushing mechanism (5) can drive the facing paper feeding seat (31) to move back and forth.

4. The double-layer paper feeding switching device according to claim 3, characterized in that: The pushing mechanism (5) includes two pushing seats (51). The pushing seat (51) can move back and forth relative to the frame (1). The two pushing seats (51) are respectively arranged on the left and right sides of the paper feeding mechanism (3). On the pushing seat (51), a pushing member (52) is fixedly connected. The pushing members (52) of the two pushing seats (51) are respectively arranged in a position-matching manner with the left and right sides of the paper feeding seat (31). The pushing mechanism (5) drives the facing paper feeding seat (31) to move back and forth through the pushing member (52). The two ejection seats (51) are both fixedly connected with an ejection rack (53) extending in the front-back direction. The frame (1) is rotatably connected with a second transmission shaft (54) extending in the left-right direction. The second transmission shaft (54) is fixedly connected with two ejection gears (55). The two ejection gears (55) are respectively engaged with the two ejection racks (53) one by one. The ejection mechanism (5) also includes an ejection drive cylinder (56). The ejection drive cylinder (56) is connected to the frame (1). The output shaft of the ejection drive cylinder (56) is connected to at least one of the ejection racks (53). The ejection drive cylinder (56) can drive the ejection rack (53) to move forward and backward.

5. The double-layer paper feeding switching device according to claim 4, characterized in that: The number of the ejection drive cylinders (56) is two, and the output shafts of the two ejection drive cylinders (56) are respectively connected to the two ejection racks (53) one by one.

6. The double-layer paper feeding switching device according to claim 4, characterized in that: Two fixed seats (4) are fixedly connected to the frame (1), and the two fixed seats (4) are respectively arranged on the left and right sides of the lifting seat (21). A lifting guide rail (41) extending in the vertical direction is fixedly connected to the fixed seat (4). The left and right sides of the lifting seat (21) are respectively slidably connected to the lifting guide rails (41) on the two fixed seats (4). A lifting limit groove (42) extending in the vertical direction is provided on the fixed seat (4); The left and right ends of the paper feed seat (31) are both provided with positioning members (311), the positioning members (311) are arranged in the corresponding lifting limit groove (42) and can slide up and down along the lifting limit groove (42), the middle part of the lifting limit groove (42) is provided with a push-out notch (421) for the corresponding push-out member (52) to pass through, the push-out member (52) is provided with a push-out groove (521) corresponding to the position of the lifting limit groove (42), when the push-out member (52) is inserted into the push-out notch (421), the push-out groove (521) is opposite to the lifting limit groove (42), the positioning member (311) can enter the push-out groove (521) and be driven by the push-out member (52) to move forward and backward.

7. The double-layer paper feeding switching device according to claim 3, characterized in that, The paper feeding mechanism (3) further comprises a paper guide (32) and a paper pressing mechanism (33), wherein the paper guide (32) is fixedly connected to the left and right sides of the paper feeding seat (31), and a paper guide groove (321) is provided on the paper guide (32). The paper pressing mechanism (33) is provided on the upper side of the paper guide (32), and the paper pressing mechanism (33) can press paper onto the paper guide (32).

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