Channel reversing mechanism and double-sided printing device

Abstract

The utility model belongs to the technical field of printing equipment, and discloses a channel reversing mechanism and a double-sided printing device.The channel reversing mechanism comprises a blocking assembly and a driving assembly, the blocking assembly comprises a rotating shaft and a plurality of blocking pieces, the rotating shaft is rotatably arranged in a channel for paper flowing, the blocking pieces are all arranged on the rotating shaft, and the driving assembly is arranged on the rotating shaft. The driving assembly comprises an eccentric wheel, a driving piece, a swing rod, an elastic piece and a connecting shaft, the two ends of the swing rod are connected with the rotating shaft and the elastic piece respectively, the elastic piece is configured to enable the swing rod to abut against the eccentric wheel all the time, and the connecting shaft is connected with the eccentric wheel and eccentrically arranged with the circle center of the eccentric wheel. The driving part is used for driving the connecting shaft to rotate. Compared with the prior art that the connecting rod is driven by an electromagnet, an auxiliary electric control system does not need to be arranged, the structure is simple, manufacturing and maintenance are convenient, the influence of voltage fluctuation is avoided, working stability is good, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a channel reversing mechanism and a double-sided printing device. Background Art

[0002] In order to improve printing efficiency, save resources and reduce costs, double-sided printing is usually used to print documents. Currently, double-sided printing is usually achieved by using a double-sided printer or manually flipping the paper on an ordinary printer. When a double-sided printer performs double-sided printing, it is mainly completed through the internal clutch reversing mechanism and channel reversing mechanism. The clutch reversing mechanism can change the flow direction of the paper, and the channel reversing mechanism is used to change the channel for the paper to flow. Under the cooperation of the channel reversing mechanism and the clutch reversing mechanism, the paper with different flow directions travels in different flow channels, thereby completing the reversing operation of the paper, and finally flows back to the bottom of the print head with the other side facing up, thereby completing the double-sided printing function.

[0003] At present, the channel switching structure usually adopts the method of electromagnet driving connecting rod to realize the closure and connection of different channels, so that when the paper flow direction does not change, other channels are in a closed state, and only the channel corresponding to the flow direction is in an open state, thereby ensuring the accuracy of the paper flow trajectory.

[0004] However, when an electromagnet is used to drive a connecting rod to open or close a channel, a high closing current is required. Due to the large closing current, the electromagnet-driven connecting rod mechanism requires a high-power DC power supply to work properly. This means that when designing and using this mechanism, an auxiliary electronic control system must be equipped, which makes the system more complex and leads to high manufacturing and maintenance costs. In addition, the response speed of the electromagnet-driven connecting rod mechanism is greatly affected by the power supply voltage, which means that in an environment where the power supply voltage is unstable, the closing performance will be affected and its working stability will be poor. Utility Model Content

[0005] The utility model aims to provide a channel reversing mechanism and a double-sided printing device, which have simple structure, low manufacturing and maintenance costs and good working stability.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a channel switching mechanism is provided, the channel switching mechanism comprising:

[0008] A blocking assembly, the blocking assembly comprising a rotating shaft and a plurality of blocking members, the rotating shaft being rotatably disposed in a passage for paper flow, the plurality of blocking members being disposed on the rotating shaft and rotating together with the rotating shaft to control the opening and closing of different paper flow passages;

[0009] A driving assembly, the driving assembly includes an eccentric wheel, a driving member, a rocker arm, an elastic member and a connecting shaft, one end of the rocker arm is connected to the end of the rotating shaft, the other end of the rocker arm is connected to the elastic member, the elastic member is configured to make the rocker arm always abut against the eccentric wheel, the connecting shaft is connected to the eccentric wheel and is eccentrically arranged with respect to the center of the eccentric wheel, and the driving member is used to drive the connecting shaft to rotate.

[0010] Optionally, the driving assembly further includes a first rotating wheel, a second rotating wheel and a transmission member, wherein the first rotating wheel is connected to a side of the connecting shaft away from the eccentric wheel, the transmission member is sleeved on the outer sides of the first rotating wheel and the second rotating wheel, the second rotating wheel is connected to an output shaft of the driving member, and the driving member is used to drive the second rotating wheel to rotate.

[0011] Optionally, the outer diameter of the first rotating wheel is greater than the outer diameter of the second rotating wheel.

[0012] Optionally, the driving assembly further comprises a fixing member, the fixing member is provided with an external thread, the rocker arm is provided with a connecting threaded hole, the fixing member is inserted into the connecting threaded hole and is threadedly connected to the rocker arm, and the elastic member is connected to the fixing member.

[0013] Optionally, the fixing member includes a blocking portion and a connecting portion, the connecting portion is provided with an external thread, the connecting portion is threadedly connected to the connecting threaded hole, the blocking portion is connected to a side of the connecting portion away from the rocker arm, and the projection of the connecting portion along the length direction is located within the projection of the blocking portion along the length direction.

[0014] Optionally, a slot is further provided on the connecting portion, and hooks are provided at both ends of the elastic member, and the hooks on the side close to the fixing member are engaged in the slot.

[0015] Optionally, the sealing component further includes a connecting sleeve, which is sleeved on the outside of the rotating shaft, the connecting sleeve is rectangular, the sealing component is provided with a rectangular through hole, and the connecting sleeve is inserted into the through hole.

[0016] Optionally, the sealing assembly further includes a limiting sleeve, which is arranged between two adjacent sealing members and sleeved on the outer side of the connecting sleeve.

[0017] Optionally, the sealing member is provided with a fitting inclined surface for abutting against the inner wall of the paper flow channel.

[0018] On the other hand, a double-sided printing device is provided, the double-sided printing device comprising a channel reversing mechanism as described in any one of the above items.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a channel reversing mechanism, by setting a rotatable rotating shaft in a channel for paper flow, and setting a plurality of sealing members rotating with the rotating shaft on the rotating shaft, when the driving member drives the connecting shaft eccentrically connected to the eccentric wheel to rotate, the elastic member always makes the swing rod abut against the eccentric wheel, so that the swing rod contacts the parts of the eccentric wheel with different center distances from the connecting shaft, so that the end of the swing rod connected to the elastic member swings with the end of the swing rod connected to the rotating shaft as the center of the circle, thereby driving the rotating shaft to rotate, so that the plurality of sealing members connected to the rotating shaft rotate with the rotating shaft, realize the opening and closing of different paper flow channels, thereby controlling the path of paper flow and realizing the reversing function of paper. Compared with the prior art of electromagnet driving connecting rod, it does not need to be equipped with an auxiliary electric control system, its structure is simple, easy to manufacture and maintain, and will not be affected by voltage fluctuations, and has good working stability and high reliability.

[0021] The utility model also provides a double-sided printing device, which can stably control the paper flow channel by applying the above-mentioned channel switching mechanism, improve the stability and reliability of the double-sided printing device when performing double-sided printing, and reduce the failure rate of the double-sided printing device when performing double-sided printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the channel reversing mechanism provided by the utility model;

[0023] Figure 2 It is a partial structural schematic diagram of a blocking component in a channel reversing mechanism provided by the utility model;

[0024] Figure 3 It is a structural schematic diagram of a driving component in a channel reversing mechanism provided by the utility model;

[0025] Figure 4 It is a structural schematic diagram of a fixing member in a channel reversing mechanism provided by the utility model;

[0026] Figure 5 The utility model provides a structural schematic diagram of a reversing mechanism for a double-sided printing device installation channel.

[0027] In the figure:

[0028] 100, paper falling channel; 200, paper rising channel; 300, paper reversing channel; 400, frame; 500, sealing plate; 600, first guide plate; 700, second guide plate;

[0029] 1. Sealing assembly; 11. Rotating shaft; 12. Sealing member; 121. Fitting inclined surface; 13. Connecting sleeve; 14. Limiting sleeve;

[0030] 2. Driving assembly; 21. Eccentric wheel; 22. Driving member; 23. Rocker; 24. Elastic member; 25. Connecting shaft; 26. First rotating wheel; 27. Second rotating wheel; 28. Transmission member; 29. ​​Fixing member; 291. Blocking part; 292. Connecting part; 293. Slot. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] In order to improve printing efficiency, save resources and reduce costs, double-sided printing is usually used to print documents. Currently, double-sided printing is usually achieved by using a double-sided printer or manually flipping the paper on an ordinary printer. When a double-sided printer performs double-sided printing, it is mainly completed through the internal clutch reversing mechanism and channel reversing mechanism. The clutch reversing mechanism can change the flow direction of the paper, and the channel reversing mechanism is used to change the channel for the paper to flow. Under the cooperation of the channel reversing mechanism and the clutch reversing mechanism, the paper with different flow directions travels in different flow channels, thereby completing the reversing operation of the paper, and finally flows back to the bottom of the print head with the other side facing up, thereby completing the double-sided printing function.

[0036] At present, the channel switching structure usually adopts the method of electromagnet driving connecting rod to realize the closure and connection of different channels, so that when the paper flow direction does not change, other channels are in a closed state, and only the channel corresponding to the flow direction is in an open state, thereby ensuring the accuracy of the paper flow trajectory.

[0037] However, when an electromagnet is used to drive a connecting rod to open or close a channel, a high closing current is required. Due to the large closing current, the electromagnet-driven connecting rod mechanism requires a high-power DC power supply to work properly. This means that when designing and using this mechanism, an auxiliary electronic control system must be equipped, which makes the system more complex and leads to high manufacturing and maintenance costs. In addition, the response speed of the electromagnet-driven connecting rod mechanism is greatly affected by the power supply voltage, which means that in an environment where the power supply voltage is unstable, the closing performance will be affected and its working stability will be poor.

[0038] Therefore, in order to improve the stability of the reversing operation, optimize the structure for realizing the reversing function, reduce the manufacturing cost, and improve the convenience during maintenance, this embodiment provides a channel reversing mechanism.

[0039] like Figures 1 to 4 As shown, the channel reversing mechanism includes a blocking assembly 1 and a driving assembly 2. The blocking assembly 1 includes a rotating shaft 11 and a plurality of blocking members 12. The rotating shaft 11 is rotatably disposed in a channel for paper flow. The plurality of blocking members 12 are all disposed on the rotating shaft 11 and rotate together with the rotating shaft 11 to control the opening and closing of different paper flow channels. The driving assembly 2 includes an eccentric wheel 21, a driving member 22, a rocker arm 23, an elastic member 24 and a connecting shaft 25. One end of the rocker arm 23 is connected to the end of the rotating shaft 11, and the other end of the rocker arm 23 is connected to the elastic member 24. The elastic member 24 is configured to make the rocker arm 23 always abut against the eccentric wheel 21. The connecting shaft 25 is connected to the eccentric wheel 21 and is eccentrically disposed to the center of the eccentric wheel 21. The driving member 22 is used to drive the connecting shaft 25 to rotate.

[0040] By arranging a rotatable rotating shaft 11 in a passage for paper flow, and arranging a plurality of blocking members 12 rotating with the rotating shaft 11 on the rotating shaft 11, when the driving member 22 drives the connecting shaft 25 eccentrically connected to the eccentric wheel 21 to rotate, the elastic member 24 always makes the swing rod 23 abut against the eccentric wheel 21, so that the swing rod 23 contacts the parts of the eccentric wheel 21 with different center distances from the connecting shaft 25, so that the end of the swing rod 23 connected to the elastic member 24 swings with the end of the swing rod 23 connected to the rotating shaft 11 as the center, thereby driving the rotating shaft 11 to rotate, so that the plurality of blocking members 12 connected to the rotating shaft 11 rotate with the rotating shaft 11, realizing the opening and closing of different paper flow passages, thereby controlling the path of paper flow, and realizing the paper reversing function. Compared with the prior art of the electromagnet driving connecting rod, it does not need to be equipped with an auxiliary electric control system, has a simple structure, is easy to manufacture and maintain, is not affected by voltage fluctuations, has good working stability, and is highly reliable.

[0041] In this embodiment, if Figure 5 As shown, the channels for paper flow include a paper falling channel 100, a paper rising channel 200 and a paper reversing channel 300. A sealing plate 500, a first guide plate 600 and a second guide plate 700 are arranged in the frame 400 of the printer. The paper falling channel 100 is formed between the sealing plate 500 and the first guide plate 600, the paper reversing channel 300 is formed between the sealing plate 500 and the second guide plate 700, and the paper rising channel 200 is formed between the first guide plate 600 and the second guide plate 700. The paper falling channel 100 is connected to the upper conveying channel in the printer, and the paper rising channel 200 is connected to the lower conveying channel in the printer. The rotating shaft 11 connected with a plurality of sealing members 12 is rotatably connected in the paper reversing channel 300, so that the plurality of sealing members 12 are driven to rotate by the rotating shaft 11, thereby realizing the opening and closing of each channel.

[0042] In actual work, after the printing on the front side of the paper is completed, the paper is transported from the upper conveying path to the paper falling channel 100 by the paper conveying mechanism. At this time, the sealing member 12 abuts against the second guide plate 700, the paper reversing channel 300 is opened, and the paper rising channel 200 is closed. The paper can smoothly enter the paper reversing channel 300 from the paper falling channel 100, and then the paper conveying mechanism conveys the paper in the reverse direction. At this time, the sealing member 12 abuts against the sealing plate 500, the paper falling channel 100 is closed, and the paper reversing channel 300 is opened. Under the reverse conveying operation of the paper conveying mechanism, the paper enters the paper rising channel 200 from the paper reversing channel 300, and is finally transported to the lower conveying path by the paper conveying mechanism to complete the reversing operation. Finally, the paper is transported from the lower conveying path to the upper conveying path to complete the printing on the back side.

[0043] Alternatively, if Figure 3As shown, the driving assembly 2 further includes a first rotating wheel 26, a second rotating wheel 27 and a transmission member 28, wherein the first rotating wheel 26 is connected to the side of the connecting shaft 25 away from the eccentric wheel 21, the transmission member 28 is sleeved on the outside of the first rotating wheel 26 and the second rotating wheel 27, and the second rotating wheel 27 is connected to the output shaft of the driving member 22, and the driving member 22 is used to drive the second rotating wheel 27 to rotate. By arranging the first rotating wheel 26, the second rotating wheel 27 and the transmission member 28 between the driving member 22 and the connecting shaft 25, a multi-stage transmission is realized, so that the rotation speed of the connecting shaft 25 can be regulated and adjusted, so that it can be adjusted according to different usage requirements.

[0044] In this embodiment, the first rotating wheel 26 and the second rotating wheel 27 are pulleys, and the transmission member 28 is a synchronous belt, which is sleeved on the outside of the first rotating wheel 26 and the second rotating wheel 27. The transmission of torque between the first rotating wheel 26 and the second rotating wheel 27 is achieved by belt transmission, which has the advantages of shock absorption, noise reduction and overload protection.

[0045] In addition, in other embodiments, the first rotating wheel 26 and the second rotating wheel 27 are sprocket wheels, the transmission member 28 is a transmission chain, and the first rotating wheel 26 and the second rotating wheel 27 are both meshed with the transmission member 28. The torque transmission between the first rotating wheel 26 and the second rotating wheel 27 is realized by chain transmission, which has high transmission efficiency and overload resistance.

[0046] Furthermore, if Figure 3 As shown, the outer diameter of the first rotating wheel 26 is greater than the outer diameter of the second rotating wheel 27. By making the outer diameter of the first rotating wheel 26 greater than the outer diameter of the second rotating wheel 27, when the driving member 22 drives the second rotating wheel 27 to rotate, the transmission member 28 transmits the torque of the second rotating wheel 27 to the first rotating wheel 26, and then the first rotating wheel 26 is used to reduce the speed, so as to adjust the speed and avoid excessive speed.

[0047] Alternatively, if Figure 3 As shown, the driving assembly 2 further includes a fixing member 29, on which an external thread is provided, and a connecting threaded hole is provided on the swing rod 23, in which the fixing member 29 is inserted and threadedly connected to the swing rod 23, and the elastic member 24 is connected to the fixing member 29. By providing the fixing member 29, it is convenient to connect the elastic member 24 to the swing rod 23.

[0048] Furthermore, if Figure 3 , Figure 4As shown, the fixing member 29 includes a blocking portion 291 and a connecting portion 292. The connecting portion 292 is provided with an external thread. The connecting portion 292 is threadedly connected to the connecting threaded hole. The blocking portion 291 is connected to the side of the connecting portion 292 away from the swing rod 23. The projection of the connecting portion 292 along the length direction is located within the projection of the blocking portion 291 along the length direction. By providing the blocking portion 291 on the fixing member 29, and making the projection of the connecting portion 292 along the length direction be located within the projection of the blocking portion 291 along the length direction, the outer dimensions of the blocking portion 291 are larger than the outer dimensions of the connecting portion 292, so that the blocking portion 291 is used to limit the elastic member 24, thereby preventing the elastic member 24 from being separated from the fixing member 29.

[0049] Furthermore, if Figure 3 , Figure 4 As shown, a slot 293 is also provided on the connecting portion 292, and hooks are provided at both ends of the elastic member 24, and the hook close to the side of the fixing member 29 is engaged in the slot 293. By providing a hook on the elastic member 24, providing a slot 293 on the fixing member 29, and engaging the hook in the slot 293, the elastic member 24 is limited, thereby preventing the elastic member 24 from sliding on the connecting portion 292. In this embodiment, the elastic member 24 with hooks at both ends is a tension spring.

[0050] Alternatively, if Figure 2 As shown, the sealing assembly 1 also includes a connecting sleeve 13, which is sleeved on the outside of the rotating shaft 11. The connecting sleeve 13 is rectangular, and the sealing member 12 is provided with a rectangular through hole, and the connecting sleeve 13 is inserted into the through hole. By sleeved the rectangular connecting sleeve 13 on the outside of the rotating shaft 11 and opening a rectangular through hole on the sealing member 12, the tip of the rectangular structure is utilized to prevent the sealing member 12 from slipping when rotating with the rotating shaft 11, thereby improving the reliability of the structure. After the connecting sleeve 13 is sleeved on the outside of the rotating shaft 11, it is welded to the rotating shaft 11.

[0051] Alternatively, if Figure 2 As shown, the blocking assembly 1 further includes a limiting sleeve 14, which is disposed between two adjacent blocking members 12 and sleeved on the outer side of the connecting sleeve 13. By arranging the limiting sleeve 14 between two adjacent blocking members 12, the spacing between each two adjacent blocking members 12 is made the same, so that on the one hand, a plurality of blocking members 12 are evenly distributed on the rotating shaft 11, and on the other hand, the limiting sleeve 14 is used to limit the blocking members 12, so as to prevent the blocking members 12 from sliding on the connecting sleeve 13, resulting in an excessive spacing between two blocking members 12, which causes paper to leak out.

[0052] Alternatively, if Figure 2As shown, the sealing member 12 is provided with a fitting slope 121 for abutting against the inner wall of the paper flow channel. By providing the fitting slope 121 on the sealing member 12, the fitting degree and fitting area between the sealing member 12 and the inner wall of the paper flow channel are increased, thereby ensuring the tightness of closing different paper flow channels.

[0053] In this embodiment, if Figure 5 As shown, a double-sided printing device is also provided, and the double-sided printing device includes the above-mentioned channel reversing mechanism. The double-sided printing device uses the above-mentioned channel reversing mechanism to stably control the paper flow channel, improve the stability and reliability of the double-sided printing device when performing double-sided printing, and reduce the failure rate of the double-sided printing device when performing double-sided printing.

[0054] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A channel reversing mechanism, characterized in that: The channel switching mechanism comprises: A blocking assembly (1), the blocking assembly (1) comprising a rotating shaft (11) and a plurality of blocking members (12), the rotating shaft (11) being rotatably arranged in a passage for paper flow, the plurality of blocking members (12) being arranged on the rotating shaft (11) and rotating together with the rotating shaft (11) to control the opening and closing of different paper flow passages; A driving assembly (2), the driving assembly (2) comprising an eccentric wheel (21), a driving member (22), a rocker arm (23), an elastic member (24) and a connecting shaft (25), one end of the rocker arm (23) being connected to the end of the rotating shaft (11), the other end of the rocker arm (23) being connected to the elastic member (24), the elastic member (24) being configured to make the rocker arm (23) always abut against the eccentric wheel (21), the connecting shaft (25) being connected to the eccentric wheel (21) and being eccentrically arranged with respect to the center of the circle of the eccentric wheel (21), and the driving member (22) being used for driving the connecting shaft (25) to rotate.

2. The channel reversing mechanism according to claim 1, characterized in that: The driving assembly (2) further comprises a first rotating wheel (26), a second rotating wheel (27) and a transmission member (28); the first rotating wheel (26) is connected to a side of the connecting shaft (25) away from the eccentric wheel (21); the transmission member (28) is sleeved on the outer sides of the first rotating wheel (26) and the second rotating wheel (27); the second rotating wheel (27) is connected to an output shaft of the driving member (22); and the driving member (22) is used to drive the second rotating wheel (27) to rotate.

3. The channel reversing mechanism according to claim 2, characterized in that: The outer diameter of the first rotating wheel (26) is greater than the outer diameter of the second rotating wheel (27).

4. The channel reversing mechanism according to claim 1, characterized in that: The driving assembly (2) further comprises a fixing member (29), the fixing member (29) being provided with an external thread, the swing rod (23) being provided with a connecting threaded hole, the fixing member (29) being inserted into the connecting threaded hole and being threadedly connected to the swing rod (23), and the elastic member (24) being connected to the fixing member (29).

5. The channel reversing mechanism according to claim 4, characterized in that: The fixing member (29) comprises a blocking portion (291) and a connecting portion (292); the connecting portion (292) is provided with an external thread; the connecting portion (292) is threadedly connected to the connecting threaded hole; the blocking portion (291) is connected to a side of the connecting portion (292) facing away from the rocker (23); and a projection of the connecting portion (292) along the length direction is located within a projection of the blocking portion (291) along the length direction.

6. The channel reversing mechanism according to claim 5, characterized in that: The connecting portion (292) is also provided with a slot (293), and hooks are provided at both ends of the elastic member (24), and the hooks on the side close to the fixing member (29) are engaged in the slot (293).

7. The channel reversing mechanism according to claim 1, characterized in that: The sealing component (1) further comprises a connecting sleeve (13), wherein the connecting sleeve (13) is sleeved on the outside of the rotating shaft (11), the connecting sleeve (13) is rectangular, the sealing member (12) is provided with a rectangular through hole, and the connecting sleeve (13) is inserted into the through hole.

8. The channel reversing mechanism according to claim 7, characterized in that: The blocking assembly (1) further comprises a limiting sleeve (14), wherein the limiting sleeve (14) is arranged between two adjacent blocking members (12) and sleeved on the outside of the connecting sleeve (13).

9. The channel reversing mechanism according to claim 1, characterized in that: The sealing member (12) is provided with a fitting inclined surface (121) for abutting against the inner wall of the paper flow channel.

10. A double-sided printing device, characterized in that: The double-sided printing device comprises a channel reversing mechanism as described in any one of claims 1-9.

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