A printing device

Abstract

The present application provides a printing device, which relates to the field of office equipment manufacturing and can be used in the financial field, including: a control circuit, a light flux detection component, a sorting component and a printer; wherein the light flux detection component detects the light flux signals on the front and back sides of the secondary paper, and sends the detected light flux signals to the control circuit; after receiving the light flux signal, the control circuit outputs a sorting instruction to the sorting component, so that the sorting component sorts out reusable secondary paper; the printer uses the secondary paper sorted by the sorting component for printing. The present application can sort secondary paper and use the sorted secondary paper to complete printing.

Description

Technical Field

[0001] The present application relates to the field of office equipment manufacturing, and specifically to a printing device capable of automatically sorting paper. Background Art

[0002] In the office, there are many scenarios where you need to use a printer to print materials. In order to practice the concept of green office, people often reuse paper that has been printed on one side (also called secondary paper). When sorting these secondary papers, people often manually divide them into three categories: one is secondary paper that cannot be reused, such as secondary paper that has content printed on both the front and back sides; the second is secondary paper that can be reused on one side but needs to be turned over before use; the third is secondary paper that does not need to adjust the front and back sides and can be directly reused. When the number of papers is large, the above sorting process is cumbersome and boring. Summary of the invention

[0003] In response to the problems in the prior art, the present application provides a printing device that can sort secondary paper and use the sorted secondary paper to complete printing.

[0004] In order to solve the above technical problems, this application provides the following technical solutions:

[0005] The present application provides a printing device, comprising: a logic gate circuit, a light flux detection component, a sorting component and a printer;

[0006] Wherein, the light flux detection component detects the light flux signals of the front and back sides of the secondary paper, and sends the detected light flux signals to the logic gate circuit;

[0007] After receiving the light flux signal, the logic gate circuit outputs a sorting instruction to the sorting component, so that the sorting component sorts out reusable secondary paper;

[0008] The printer uses the secondary paper sorted by the sorting component for printing.

[0009] Furthermore, the sorting component comprises:

[0010] A mechanical transmission component executes a paper conveying action according to the sorting instruction to achieve secondary paper sorting;

[0011] A paper box to be sorted, used for storing paper to be sorted;

[0012] A printing paper box, used to store sorted paper that can be used for single-sided printing;

[0013] Waste paper box, used to store paper that has been sorted and confirmed to be non-reusable.

[0014] Furthermore, the luminous flux signal includes a first signal and a second signal; the luminous flux detection component includes:

[0015] A first photosensitive matrix device, used for sensing the light flux of the first side of the paper to be sorted and sending the first signal;

[0016] The second photosensitive matrix device is used to sense the light flux of the second side of the paper to be sorted and send out the second signal; the logic gate circuit outputs the corresponding sorting instruction based on the first signal and the second signal.

[0017] Furthermore, the first photosensitive matrix device and the second photosensitive matrix device both include light-emitting LED lamp beads and light flux receivers.

[0018] Furthermore, the mechanical transmission component includes: a first motor, a first driving gear shaft and three first driven gear shafts; the first motor drives the first driving gear shaft to rotate; the first driven gear shaft realizes synchronous rotation with the first driving gear shaft under the bite action between the gear shafts.

[0019] Furthermore, the mechanical transmission component also includes: a second motor, a second driving gear shaft and a second driven gear shaft; the second motor drives the second driving gear shaft to rotate; the second driven gear shaft realizes synchronous rotation with the second driving gear shaft under the drive of the second driving gear shaft.

[0020] Furthermore, two electromagnets are provided at one end of one of the first driven gear shafts; any one of the two electromagnets is actuated after receiving the sorting instruction to realize the translation of the first driven gear shaft and feed the paper that can be used for single-sided printing into the printing paper box.

[0021] Furthermore, the two electromagnets do not act after receiving the sorting instruction at the same time, so as to send the printing paper that cannot be reused into the waste paper box.

[0022] Furthermore, the sorting instruction includes:

[0023] A first sorting instruction is used to push the paper that cannot be reused into a waste paper box;

[0024] The second sorting instruction is used to turn over the paper that can be reused and push it into the printing paper box;

[0025] The third sorting instruction is used to push the paper that can be reused directly into the printing paper box.

[0026] Furthermore, the logic gate circuit is connected to a power supply; the power supply supplies power to the sorting component and the printer.

[0027] In response to the problems in the prior art, the printing device provided by the present application can sort secondary paper and use the sorted secondary paper to complete printing; specifically, it can automatically detect the three states of secondary paper printed on both sides, printed on the front side, and printed on the back side, instead of manually completing the secondary paper sorting; it complies with the concept of green office and reuses printed paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A structural diagram of a printing device in an embodiment of the present application;

[0030] Figure 2 A structural diagram of a light flux detection component in an embodiment of the present application;

[0031] Figure 3 One of the structural diagrams of the sorting component in the embodiment of the present application;

[0032] Figure 4 The second structural diagram of the sorting component in the embodiment of the present application;

[0033] Figure 5 The third structural diagram of the sorting component in the embodiment of the present application;

[0034] Figure 6 Schematic diagram of the engagement structure of the sorting component in the embodiment of the present application;

[0035] Figure 7 Schematic diagram of the direction of waste paper pushing in the embodiment of the present application;

[0036] Figure 8 Schematic diagram of the direction of pushing paper with words on the front in the embodiment of the present application;

[0037] Fig. 9 Schematic diagram of the direction of pushing paper with words on the reverse side in the embodiment of the present application;

[0038] Fig.10 One of the structural diagrams of the logic gate circuit in the embodiment of the present application;

[0039] Fig.11 The second structural diagram of the logic gate circuit in the embodiment of the present application;

[0040] Fig.12 The third structural diagram of the logic gate circuit in the embodiment of the present application;

[0041] Fig.13 The fourth structural diagram of the logic gate circuit in the embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] It should be noted that the printing device provided in the present application can be used in the financial field, and can also be used in any field other than the financial field. The application field of the printing device provided in the present application is not limited.

[0044] In order to save office paper and practice the environmental protection concept of green office, paper that has been printed on one side can be reused as printing paper. When sorting printed paper, people often manually divide it into three categories: one is paper that cannot be reused, such as paper that has content printed on both the front and back sides; the second is paper that can be reused on one side of the front and back, but needs to be turned over before use; the third is paper that can be directly reused without adjusting the front and back sides. The manual sorting process is complicated and prone to errors, so there is a need for a device that can realize automatic sorting of paper (also called secondary paper) and can use the sorted paper to complete printing.

[0045] In one embodiment, see Figure 1 In order to be able to sort secondary paper and use the sorted secondary paper to complete printing, the present application provides a printing device, including: a logic gate circuit 21, a light flux detection component 25, a sorting component 22 and a printer 23. Among them, the logic gate circuit 21 is used to control the sorting process and printing process of secondary paper. The logic gate circuit 21 is connected to a power supply 211, and the power supply 211 can supply power to the sorting component 22 and the printer 23. The light flux detection component 25 can detect the light flux on the front and back of the secondary paper, and determine which of the three categories (front side used, back side used or double-sided used) the secondary paper belongs to. The sorting component 22 includes a plurality of mutually meshing gear shafts and a motor, which can complete the sorting of secondary paper under the control of the logic gate circuit 21. Among them, the logic gate circuit 21 can be used as the control circuit in the embodiment of the present application, but the control circuit can also be a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable chips such as CPU, and their functions are to control the above-mentioned sorting and printing processes, and the present application is not limited to this.

[0046] Specifically, the light flux detection component 25 detects the light flux signals on both the front and back sides of the secondary paper, and sends the detected light flux signals to the logic gate circuit 21; after receiving the light flux signals, the logic gate circuit 21 outputs corresponding sorting instructions to the sorting component 22, so that the sorting component 22 sorts out the reusable secondary paper; the printer 23 uses the secondary paper sorted by the sorting component 22 for printing.

[0047] In one embodiment, the light flux signals include a first signal and a second signal; the light flux detection component 25 includes: a first photosensitive matrix device 251 and a second photosensitive matrix device 252. Among them, the first photosensitive matrix device 251 is used to sense the light flux on the first side of the paper to be sorted and send out the first signal; the second photosensitive matrix device 252 is used to sense the light flux on the second side of the paper to be sorted and send out the second signal; the logic gate circuit 21 outputs corresponding sorting instructions based on the first signal and the second signal.

[0048] Specifically, taking the A4-sized paper commonly used in the office environment as an example, the method for judging the category of secondary paper (the above three categories) can be as follows:

[0049] The first method is to distinguish between available secondary paper and unavailable secondary paper according to the format of A4 paper. Specifically, a quantitative light flux (such as 10,000 units) is emitted by the photosensitive matrix device; for example, assuming that the light flux reflected back by a complete A4-sized paper is within a certain range (such as 9985 to 9995 units), and the light flux received by the photosensitive matrix device is L; then, when 9985 < L < 9995, it is judged that the paper is available; when L < 9985, it is judged that the format (or length and width) of the paper does not meet the requirements.

[0050] The second method is for the photosensitive matrix device to judge whether there are words on the front or back of the paper by receiving the reflected light flux. Continuing with the above example, when 9990 < L < 9995, the photosensitive matrix device judges that there are no words on the detected surface of the paper; when 9985 < L < 9990, the photosensitive matrix device judges that there are words on the detected surface of the paper. However, the present application does not limit specific values.

[0051] The third method can also use OCR recognition technology for judgment. By identifying whether there are characters on the paper surface to determine whether the paper can be reused. The present application is not limited to the above three implementation methods.

[0052] It should be noted that refer to Figure 2The first photosensitive matrix device 251 and the second photosensitive matrix device 252 both include light-emitting LED lamp beads and light flux receivers. The light-emitting LED lamp beads are used to emit light of a preset light flux to the paper to be tested 253; the light flux receiver can receive and detect the light flux returned by the paper, thereby generating a light flux signal and sending it to the logic gate circuit 21, so that the logic gate circuit 21 can output a sorting instruction according to the light flux signal.

[0053] In one embodiment, see Figure 1 , Figure 3 and Figure 4 The sorting component 22 includes: a mechanical transmission component 221, a paper box 222 to be sorted, a printing paper box 223 and a waste paper box 224. The mechanical transmission component 221 performs paper transmission according to the sorting instruction to realize the secondary paper sorting; the paper box 222 to be sorted is used to store the paper to be sorted; the printing paper box 223 is used to store the sorted paper that can be used for single-sided printing; the waste paper box 224 is used to store the paper that cannot be reused after sorting.

[0054] Specifically, in one embodiment, see Figure 3 , Figure 4 and Figure 6 The mechanical transmission component 221 includes: a first motor 2211, a driving gear shaft 2212 and driven gear shafts 2213-1, 2213-2 and 2213-3; the first motor 2211 drives the driving gear shaft 2212 to rotate; the driven gear shaft 2213 realizes synchronous rotation with the driving gear shaft 2212 under the bite action between the gear shafts.

[0055] It is understandable that the first motor 2211 can be connected to the power supply 211 in the printing device, and after receiving the sorting instruction sent by the logic gate circuit 21, it can be activated to drive each gear shaft to rotate. It should be noted that the first motor 2211 itself can be fixedly connected to a gear, see Figure 4 , so as to drive the driving gear shaft 2212 to rotate, and then drive the driven gear shaft 2213-1, the driven gear shaft 2213-2 and the driven gear shaft 2213-3 to rotate synchronously under the bite action between the gear shafts.

[0056] In specific implementation, the driven gear shaft 2213-1 can be driven to rotate by the active gear shaft 2212 because of the meshing relationship between the teeth of the driven gear shaft 2212; the driven gear shaft 2213-2 and the driven gear shaft 2213-3 can be meshed with the active gear shaft 2212, so as to be driven to rotate by the active gear shaft 2212, or they can be equipped with a DC motor and rotate under the drive of the DC motor, but the present application is not limited thereto. The signal of the DC motor can be the same as or corresponding to the first motor 2211.

[0057] In one embodiment, the sorting instruction is generated by the logic gate circuit 21 after receiving the light flux signal. The sorting instruction includes a discard instruction (indicating that the paper enters the waste paper box 224 directly), a flip instruction (indicating that the paper enters the printing paper box 223 after flipping), and a direct entry instruction (indicating that the paper enters the printing paper box 223 directly without flipping). Fig.12 , when the first signal in the light flux signal (sent by the first photosensitive matrix device 251) is 0 and the second signal (sent by the second photosensitive matrix device 252) is 0, the logic gate circuit 21 outputs a discard instruction, corresponding to state A (there are words on both sides of the paper and it cannot be printed twice); see Fig.13 , when the first signal in the light flux signal is 0 and the second signal is 1, the logic gate circuit 21 generates a flipping instruction, corresponding to state B (there are words on the front of the paper, and it needs to be flipped for secondary printing); see Fig.11 When the first signal in the light flux signal is 1 and the second signal is 0, the logic gate circuit 21 generates a direct-entry instruction, corresponding to the C state (there are words on the back of the paper, and secondary printing can be performed without turning over). It should be noted that in this embodiment, 1 represents a high level and 0 represents a low level.

[0058] In one embodiment, see Figure 3 and Figure 4 , the movement position of the driven gear shaft 2213-1 will be restricted by the slot. The movement direction of the driven gear shaft 2213-1 will be controlled by the electromagnet 2218 and the electromagnet 2219. When the electromagnet 2218 is energized, it can push the driven gear shaft 2213-1 to move to the right; when the electromagnet 2219 is energized, it can push the driven gear shaft 2213-1 to move to the left; when the electromagnets 2218 and 2219 are de-energized at the same time, the electromagnetic force inside the electromagnet disappears, and the internal reset spring generates a pullback force, and the driven gear shaft 2213-1 stops. Figure 5 The movable track of the driven gear shaft 2213-1 can be a small arc around the driving gear shaft 2212.

[0059] In one embodiment, the structure of the logic gate circuit 21 can be seen in Fig.10 shown.

[0060] In one embodiment, see Fig.11When the first photosensitive matrix device 251 detects that the upper surface (also called the front side) of the paper is blank, it outputs a high level (signal 1); when the second photosensitive matrix device 252 detects that the lower surface (also called the back side) of the paper has words, it outputs a low level (signal 0); after passing through the logic OR gate, it outputs a high level (signal 1); then after passing through the logic AND gate, it outputs a high level (signal 1) to the electromagnet 2218 and a low level (signal 0) to the electromagnet 2219; in this case, the electromagnet 2218 is energized and actuated; the paper is not turned over and directly enters the printing paper box 223; corresponding to the above-mentioned direct entry instruction.

[0061] In one embodiment, see Fig.12 When the first photosensitive matrix device 251 detects that there are words on the upper surface (also called the front side) of the paper, it outputs a low level (signal 0); when the second photosensitive matrix device 252 detects that there are words on the lower surface (also called the back side) of the paper, it outputs a low level (signal 0); after passing through the logic OR gate, it outputs a low level (signal 0); then after passing through the logic AND gate, it outputs a low level (signal 0) to the electromagnet 2218 and outputs a low level (signal 0) to the electromagnet 2219; in this case, the electromagnet 2218 and the electromagnet 2219 are not powered and do not operate. The paper is not turned over and directly enters the waste paper box 224; corresponding to the above-mentioned waste instruction.

[0062] In one embodiment, see Fig.13 When the first photosensitive matrix device 251 detects that there is text on the upper surface (also called the front side) of the paper, it outputs a low level (signal 0); when the second photosensitive matrix device 252 detects that the lower surface (also called the back side) of the paper is blank, it outputs a high level (signal 1); after passing through the logic OR gate, it outputs a high level (signal 1); then after passing through the logic AND gate, it outputs a high level (signal 1) to the electromagnet 2219 and outputs a low level (signal 0) to the electromagnet 2218; in this case, the electromagnet 2219 is energized and operates; after the paper is turned over, it enters the printing paper box 223; corresponding to the above-mentioned turning over instruction.

[0063] In one embodiment, the A state corresponds to waste paper that cannot be reused. The relative position relationship and rotation direction of the driving gear shaft 2212 and the driven gear shafts 2213-1, 2213-2 and 2213-3 in the A state are as follows: Figure 7 When the motor 2211 receives a discard instruction, it controls a driving gear shaft 2212 and driven gear shafts 2213 - 1 , 2213 - 2 and 2213 - 3 to push the waste paper directly to the waste paper box 224 .

[0064] Specifically, when the logic gate circuit 21 issues a discard instruction, the trajectory of the paper movement is shown in FIG. Figure 7As indicated by the arrow in , the driving gear shaft 2212 and the driven gear shaft 2213 - 3 located on the right thereof rotate counterclockwise; the driven gear shaft 2213 - 1 and the driven gear shaft 2213 - 2 rotate clockwise; thereby squeezing the waste paper out through the outlet 2220 and dropping it into the waste paper box 224 .

[0065] In one embodiment, the B state corresponds to the paper that needs to be turned over before it can be reused. The relative position relationship and rotation direction of the driving gear shaft 2212 and the driven gear shafts 2213-1, 2213-2 and 2213-3 in the B state are as follows: Figure 8 When the motor 2211 receives a flipping instruction, it controls a driving gear shaft 2212 and driven gear shafts 2213 - 1 , 2213 - 2 and 2213 - 3 to flip the paper and then push it into the printing paper box 223 .

[0066] Specifically, see Figure 3 Since the two ends of the driven gear shaft 2213-1 located above the driving gear shaft 2212 are respectively provided with an electromagnet 2218 and an electromagnet 2219, after receiving the sorting instruction, either of the two electromagnets will be activated to realize the translation of the driven gear shaft 2213-1, and the paper that can be used for single-sided printing is sent to the printing paper box 223. Therefore, when the logic gate circuit 21 issues a flipping instruction, the electromagnet 2219 is activated to make the driven gear shaft 2213-1 move to the left. Figure 3 or Figure 8 The position shown in FIG. 22 is shifted to the left so that the driven gear shaft 2213-1 is located above the left side of the driving gear shaft 2212, see FIG. Figure 8 Thus, when the outlet 2220 is closed, the paper can be moved along Figure 8 Move in the direction of the arrow in the middle, complete the downward bend, and then pass through the guide plate 2221 (see Figure 1 ) is guided to slide into the printing paper box 223. A lifting spring 2222 is also provided below the guide plate 2221. Figure 8 , the driving gear shaft 2212 and the driven gear shaft 2213-3 located on the right thereof rotate counterclockwise; the driven gear shaft 2213-1 and the driven gear shaft 2213-2 rotate clockwise.

[0067] In one embodiment, the C state corresponds to paper that can be directly reused without turning over. The relative position relationship and rotation direction of the driving gear shaft 2212 and the driven gear shafts 2213-1, 2213-2 and 2213-3 in the C state are as follows: Fig. 9 When the motor 2211 receives the direct entry instruction, it controls a driving gear shaft 2212 and driven gear shafts 2213 - 1 , 2213 - 2 and 2213 - 3 to push the paper directly into the printing paper box 223 .

[0068] Specifically, the trajectory of paper movement can be seen in Fig. 9 First, when the logic gate circuit 21 issues a direct-entry instruction, the electromagnet 2218 operates to cause the driven gear shaft 2213-1 to move to the Figure 3 , Fig. 9 The position shown in the figure is translated to the right so that the driven gear shaft 2213-1 is located above the right side of the driving gear shaft 2212, see Fig. 9 As shown. The four gear shafts rotate as follows: first, the active gear shaft 2212 and the driven gear shaft 2213-3 located on its right rotate counterclockwise; the driven gear shaft 2213-1 and the driven gear shaft 2213-2 rotate clockwise; at this time, when the outlet 2220 is open, the paper is pushed out of the outlet 2220 horizontally, but not completely. Then, the active gear shaft 2212 rotates clockwise, and the driven gear shaft 2213-1 located on the upper right side rotates counterclockwise; at this time, the paper is pushed out to the lower right through the guide plate 2221 (see Figure 1 ) is guided to slide into the printing paper box 223.

[0069] It should be noted that the active gear shaft 2212 can first rotate counterclockwise under the drive of the motor 2211, and then rotate a certain number of times, and then rotate clockwise under the drive of the motor 2211. According to the prior art, the rotation direction of the motor 2211 can be changed by changing the direction of the current in the motor 2211, thereby driving the active gear shaft 2212 to change the rotation direction.

[0070] It should also be noted that, assuming that the number of turns of the active gear shaft 2212 is N; when N is greater than the length of A4 paper / the circumference of the active gear shaft 2212, all the paper can be twisted out through the active gear shaft 2212 and the driven gear shaft 2213-1 and enter the waste paper box 224; when the active gear shaft 2212 rotates counterclockwise for N-1 turns and then rotates clockwise for N turns, the following can be achieved: Fig. 9 The paper pushing process is shown.

[0071] In one embodiment, see Figure 1 The mechanical transmission component 221 also includes: a motor 2214, a driving gear shaft 2215 and a driven gear shaft 2216; the motor 2214 drives the driving gear shaft 2215 to rotate; the driven gear shaft 2216 is driven by the driving gear shaft 2215 to achieve synchronous rotation with the driving gear shaft 2215. The purpose of the rotation of the driving gear shaft 2215 and the driven gear shaft 2216 is to send the paper to be sorted into the light flux detection component 25. Figure 1 Roller 2217 can be unpowered, and its function is to assist the entry of paper. Roller 2223 can also be unpowered, and its function is to assist the paper to slide into the printing paper box 223.

[0072] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0073] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0074] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of this specification. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0075] The above is only an example of the embodiment of the present specification and is not intended to limit the embodiment of the present specification. For those skilled in the art, the embodiment of the present specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiment of the present specification shall be included in the scope of the claims of the embodiment of the present specification.

Claims

1. A printing device, characterized in that: include: Control circuit, light flux detection component, sorting component and printer; Wherein, the light flux detection component detects the light flux signals of the front and back sides of the secondary paper, and sends the detected light flux signals to the control circuit; After receiving the light flux signal, the control circuit outputs a sorting instruction to the sorting component, so that the sorting component sorts out reusable secondary paper; The printer uses the secondary paper sorted by the sorting component to print; Wherein, the sorting component comprises: A mechanical transmission component performs a paper conveying action according to the sorting instruction to achieve secondary paper sorting; A paper box to be sorted, used for storing paper to be sorted; A printing paper box, used to store sorted paper that can be used for single-sided printing; Waste paper box, used to store paper that has been sorted and confirmed to be non-reusable; Wherein, the luminous flux signal includes a first signal and a second signal; the luminous flux detection component includes: A first photosensitive matrix device, used for sensing the light flux of the first side of the paper to be sorted and sending the first signal; The second photosensitive matrix device is used to sense the light flux of the second side of the paper to be sorted and send out the second signal; the control circuit outputs the corresponding sorting instruction based on the first signal and the second signal.

2. The printing device according to claim 1, characterized in that: The first photosensitive matrix device and the second photosensitive matrix device both include light-emitting LED lamp beads and a light flux receiver.

3. The printing device according to claim 1, characterized in that: The mechanical transmission component includes: a first motor, a first driving gear shaft and three first driven gear shafts; the first motor drives the first driving gear shaft to rotate; the first driven gear shaft realizes synchronous rotation with the first driving gear shaft under the bite action between the gear shafts.

4. The printing device according to claim 1, characterized in that: The mechanical transmission component also includes: a second motor, a second driving gear shaft and a second driven gear shaft; the second motor drives the second driving gear shaft to rotate; the second driven gear shaft is driven by the second driving gear shaft to achieve synchronous rotation with the second driving gear shaft.

5. The printing device according to claim 3, characterized in that: One end of one of the first driven gear shafts is provided with two electromagnets; any one of the two electromagnets is actuated after receiving the sorting instruction to realize the translation of the first driven gear shaft and feed the paper that can be used for single-sided printing into the printing paper box.

6. The printing device according to claim 5, characterized in that: The two electromagnets do not act after receiving the sorting instruction at the same time, so as to send the printing paper that cannot be reused into the waste paper box.

7. The printing device according to claim 5, characterized in that: The sorting instructions include: A first sorting instruction is used to push the paper that cannot be reused into a waste paper box; The second sorting instruction is used to turn over the paper that can be reused and push it into the printing paper box; The third sorting instruction is used to push the paper that can be reused directly into the printing paper box.

8. The printing device according to claim 1, characterized in that: The control circuit is connected to a power source; the power source supplies power to the sorting component and the printer.

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