A paper roll anti-reverse mounting structure and printer

Abstract

This invention provides a paper roll anti-reverse loading structure and a printer. The anti-reverse loading structure includes: a guide plate disposed inside the printer for guiding the printing paper; the guide plate includes a first guide surface and a second guide surface, which are at an angle; the first guide surface is close to the printer's paper output port, and the second guide surface is close to the paper roll inserted into the printer; when the paper roll is loaded correctly, the printing paper moves along the first guide surface toward the paper output port; when the paper roll is loaded incorrectly, the printing paper moves along the second guide surface and the first guide surface toward the paper output port in sequence; a sensing module is disposed on the second guide surface to sense the movement path of the printing paper and determine whether the paper roll is loaded incorrectly based on the movement path. This solution can detect and alert the user immediately when the printing paper roll is loaded incorrectly, avoiding printing failures or blurry text, and affecting the user experience.

Description

Technical Field

[0001] This invention relates to the field of printer technology, and more particularly to a printer paper roll anti-reverse mounting structure and printer. Background Technology

[0002] A thermal printer is a device that uses thermal technology for printing, suitable for scenarios such as logistics, retail, and healthcare. Thermal printers require no ink or ribbon, only thermal paper, resulting in lower consumable costs; their compact size makes them suitable for mobile offices or on-site printing needs. Conventional printing paper only has a coating on one side, and printing requires contact between the coated side and the printer's thermal plate. Thermal printers lack built-in error prevention features; if the paper roll is placed backwards, there's no warning, and the printer can continue operating until printing occurs, at which point the problem is not noticed. Inverted paper rolls prevent the thermal side from contacting the print head, resulting in inaccurate color development and potentially causing printing failures or blurry text. Therefore, a solution is needed that can immediately detect and alert the user when the paper roll is placed backwards. Summary of the Invention

[0003] The purpose of this invention is to provide a paper roll anti-reverse mounting structure and printer, which can detect and remind the user immediately when the paper roll is mounted backwards, so as to avoid printing failure or blurry text, and to avoid paper waste.

[0004] The technical solution provided by this invention is as follows: In a first aspect, this application provides a printer paper roll anti-reverse mounting structure, applied to a printer, comprising: A guide plate, disposed inside the printer, is used to guide the printing paper. The guide plate includes a first guide surface and a second guide surface, and there is an included angle between the first guide surface and the second guide surface. The first guide surface is close to the paper output port of the printer, and the second guide surface is close to the paper roll inserted into the printer. When the paper roll is loaded in the forward direction, the printing paper moves toward the paper outlet along the first guide surface; when the paper roll is loaded in the reverse direction, the printing paper moves toward the paper outlet along the second guide surface and the first guide surface in sequence. A sensing module is provided on the second guide surface. The sensing module is used to sense the movement path of the printing paper and determine whether the paper roll is reversed based on the movement path.

[0005] In some embodiments, the portion of the printing paper between the paper roll and the paper outlet includes a first segment and a second segment; When the paper roll is in the correct orientation, the first segment is attached to the first guide surface, and the angle between the second segment and the first segment is 180°. When the paper roll is reversed, the first segment is attached to the first guide surface, and the second segment is attached to the second guide surface; or, the first segment is attached to the first guide surface, and the included angle between the second segment and the first segment is less than 180°.

[0006] In some embodiments, the sensing module includes a photoelectric sensing module; When the paper roll is mounted upright, the photoelectric sensing module is used to sense a first distance between the photoelectric sensing module and the paper roll in the infrared light emission direction; when the paper roll is mounted in reverse, the photoelectric sensing module is used to sense a second distance between the photoelectric sensing module and the second segment in the infrared light emission direction; when the paper roll diameters are the same, the second distance is less than the first distance; the sensing module determines the movement path of the printing paper based on the first distance or the second distance.

[0007] In some embodiments, the sensing module includes a pressure sensing module; The pressure sensing module is used to sense the pressure on the second guide surface; when the paper roll is mounted upright, the pressure sensed by the pressure sensing module is zero; when the paper roll is mounted in reverse, the pressure sensed by the pressure sensing module is greater than zero; the sensing module determines the movement path of the printing paper based on the pressure magnitude.

[0008] In some embodiments, the photoelectric sensing module includes a photoelectric detection sensor and a photoelectric sensing circuit. The photoelectric detection sensor is used to emit infrared light and receive reflected infrared light, and the photoelectric sensing circuit is used to output a sensed voltage based on the time difference between the photoelectric detection sensor emitting infrared light and receiving reflected infrared light. When the paper roll is mounted upright, the photoelectric sensing circuit outputs a first voltage, which corresponds to the first distance; when the paper roll is mounted in reverse, the photoelectric sensing circuit outputs a second voltage, which corresponds to the second distance.

[0009] In some embodiments, the pressure sensing module includes a micro switch and a pressure sensing circuit. When the paper roll is loaded in the correct orientation, the micro switch is open, and the pressure sensing circuit outputs no voltage or outputs a third voltage. When the paper roll is loaded in the reverse orientation, the micro switch is closed, and the pressure sensing circuit outputs a fourth voltage.

[0010] In some embodiments, the printer includes a motherboard, a printing module, and a notification module, wherein the motherboard is electrically connected to the printing module and is used to control the printing module to print on the printing paper; The motherboard is electrically connected to the sensing module and is used to receive the sensing voltage of the sensing module and determine whether the paper roll is reversed based on the sensing voltage. When the paper roll is determined to be reversed, the reminder module provides a reminder.

[0011] In some embodiments, the anti-reverse mounting structure for printer paper rolls provided in this application further includes a flexible circuit board, which is electrically connected to the main board; The printer includes a housing and a flip cover. The housing has a receiving cavity, and the receiving cavity has a bracket for placing the paper roll. One end of the flip cover is rotatably connected to the housing, and the other end is engaged with the housing. The flexible circuit board is movably mounted on the flip cover, and the flexible circuit board includes a protruding portion. The sensing module is mounted on the protruding portion, and when the housing and the flip cover are engaged, the protruding portion abuts against the second guide surface.

[0012] In some embodiments, the anti-reverse mounting structure for printer paper rolls provided in this application further includes an adapter circuit board, the flexible circuit board including connecting copper pillars, the adapter circuit board including an adapter connector, and a motherboard spring provided on the motherboard; The bracket is detachably connected to the housing, and when the bracket is fixed to the housing, the adapter circuit board contacts the main board spring, so that the adapter circuit board is electrically connected to the main board; When the housing and the flip cover are engaged, the connecting copper pillars make contact with the adapter connector, thereby electrically connecting the flexible circuit board to the adapter circuit board, and then to the motherboard.

[0013] Secondly, this application provides a printer, including the anti-reverse paper roll structure described in the first aspect.

[0014] The present invention provides a paper roll anti-reverse mounting structure and printer, which can detect and remind the user immediately when the printing paper roll is mounted backwards, thus avoiding printing failure or blurry text, affecting the user experience, and avoiding paper waste. Attached Figure Description

[0015] The preferred embodiments will now be described in a clear and easy-to-understand manner, with reference to the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this solution.

[0016] Figure 1 This is a schematic diagram of the overall structure of a printer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a printer structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the exploded structure of a printer according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a printer flip-top structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a printer housing structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a printer motherboard structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the printer disassembly structure according to an embodiment of the present invention; Figure 8 This is a schematic cross-sectional view of a printer according to an embodiment of the present invention with the paper roll in an upright position; Figure 9 This is a schematic cross-sectional view of a printer according to an embodiment of the present invention when the paper roll is reversed; Figure 10 This is a schematic diagram of a photoelectric sensing circuit according to an embodiment of the present invention; Figure 11 This is a schematic diagram of a pressure sensing circuit according to an embodiment of the present invention.

[0017] Numbering in the diagram: 10-Housing; 11-Bracket; 12-Mainboard; 13-Printing module; 14-Reminder module; 15-Mainboard screw; 16-Mainboard spring; 17-Fixing screw; 20-Flip cover; 21-Pin; 30-Guide plate; 31-First guide surface; 32-Second guide surface; 40-Sensing module; 41-Photoelectric sensing module; 42-Pressure sensing module; 50-Flexible circuit board; 51-Connecting copper pillar; 60-Adapter circuit board; 61-Adapter connector. Detailed Implementation

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0019] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0020] A thermal printer is a device that uses thermal technology for printing, suitable for scenarios such as logistics, retail, and healthcare. Thermal printers do not require ink or ribbons; they only need thermal paper to print, resulting in lower consumable costs. Their compact size makes them suitable for mobile offices or on-site printing needs. Conventional printing paper only has a coating on one side, and printing can only occur when the coated side contacts the printer's thermal plate.

[0021] Thermal printers lack built-in error prevention features. If the paper roll is inserted backwards, there's no warning, and the printer can continue operating until printing occurs, at which point the problem isn't noticed. Inverted paper rolls prevent the thermal surface from contacting the print head, hindering proper color development and potentially causing printing failures or blurry text. This issue arises because the printer housing contains a holder for the paper roll. Once inserted, the paper roll rotates as paper is used. Even when the paper roll is reversed, the process continues normally, making it difficult to detect. However, since the paper roll rotates around the center of the holder, reversing the paper roll alters the paper's position, causing a slight shift in the paper's path (refer to the instruction manual). Figure 8 The paper roll shown is positioned upright, and the paper's movement path and attachment are shown. Figure 9 The diagram shows the paper's movement path when the paper roll is reversed, which can lead to printing failures or blurry text. Therefore, a solution is needed that can detect and alert the user immediately when the paper roll is reversed.

[0022] Considering that the printer remains otherwise unchanged after the paper roll is inserted backwards, only the paper's movement path changes, this application addresses this issue by sensing the real-time position of the paper to determine its direction of movement. This is particularly useful when inserting a new paper roll into the printer, allowing the user to easily adjust the paper roll and prevent incorrect printer use. The following is a detailed description of this solution with reference to the accompanying drawings: In one embodiment, refer to the appendix to the specification. Figure 1 To be continued Figure 9 This application provides a paper roll anti-reverse mounting structure for a printer. The printer includes a housing 10 and a flip cover 20. The housing 10 has a receiving cavity, and a bracket 11 for placing a paper roll is provided in the receiving cavity. When it is necessary to place or replace the paper roll, the paper roll can be placed into the bracket 11 by opening the flip cover 20. The housing 10 and the flip cover 20 are movably connected. This application does not limit the specific connection method. For example, in one example, one end of the flip cover 20 is rotatably connected to the housing 10 by a pin 21, and the other end is snapped into the housing 10; in another example, the flip cover 20 is closed and connected to the housing 10.

[0023] The anti-reverse paper roll structure includes a guide plate 30, which is disposed inside the printer to guide the printing paper. The guide plate 30 is located near the printer's paper output port and printing module. The guide plate 30 can be fixed inside the housing 10 or fixed to the flip cover 20, extending into the receiving cavity as the housing 10 and the flip cover 20 engage; this application does not impose any limitations on this. The guide plate 30 includes a first guide surface 31 and a second guide surface 32, with an included angle (e.g., 90°) between the first guide surface 31 and the second guide surface 32. The first guide surface 31 is located near the printer's paper output port, and the second guide surface 32 is located near the paper roll inserted into the printer. The guide plate 30 can be configured in different styles. For example, in one example, the guide plate 30 is a rectangular block, with the first guide surface 31 and the second guide surface 32 being two perpendicular faces of the rectangular block. In another example, the guide plate 30 includes two perpendicular guide pieces, with the first guide surface 31 and the second guide surface 32 being the faces of the two guide pieces. Furthermore, considering that the diameter of the paper roll may be different, or that the diameter of the paper roll may change as the paper roll is used, the two guide pieces can also be movably connected, with one end of the two guide pieces rotatably connected and the other end connected by an elastic element such as a spring, so that the first guide surface 31 and the second guide surface 32 can adapt to paper rolls of different diameters.

[0024] Reference Appendix Figure 8 and attached Figure 9 Because the position of the paper feed point changes when the paper roll is rotated forward or backward, the paper moves towards the paper outlet along the first guide surface 31 when the paper roll is rotated forward; while when the paper roll is rotated backward, the paper moves towards the paper outlet along the second guide surface 32 and the first guide surface 31 in sequence. It is worth noting that since the diameter of different paper rolls may vary, when the paper roll is rotated backward, the paper may move along the second guide surface 32 or at an angle to it. Specifically, for ease of demonstration, the portion of the paper between the paper roll and the paper outlet is divided into a first segment and a second segment. When the paper roll is rotated forward, the first segment is against the first guide surface 31, and the angle between the second segment and the first segment is 180°. When the paper roll is rotated backward, the first segment is against the first guide surface 31, and the second segment is against the second guide surface 32; or, the first segment is against the first guide surface 31, and the angle between the second segment and the first segment is less than 180°.

[0025] A sensing module 40 is provided on the second guide surface 32. The sensing module 40 is used to sense the movement path of the printing paper and determine whether the paper roll is reversed based on the movement path. Specifically, the sensing module 40 determines the movement path of the printing paper by sensing whether there is printing paper on or within a preset distance of the second guide surface 32. When the printing paper is upright, it will not pass through or approach the second guide surface 32, but will move directly along the first guide surface 31; when the printing paper is reversed, it will not pass through or approach the second guide surface 32. Then, it can determine whether the paper roll is reversed based on the movement path and remind the user when it is reversed, for example, by using a speaker or loudspeaker.

[0026] This solution determines the paper's movement path by sensing its real-time position, thereby identifying whether the paper roll is reversed. It can detect and alert the user immediately if the paper roll is reversed, preventing printing failures or blurry text that could negatively impact the user experience and avoid paper waste.

[0027] In this solution, the sensing module 40 is used to sense the movement path of the printing paper, and can be implemented in various ways. For example, in one example, the sensing module includes a photoelectric sensing module 41; when the paper roll is mounted upright, the photoelectric sensing module 41 is used to sense a first distance between the photoelectric sensing module 41 and the paper roll in the infrared light emission direction (usually perpendicular to the second guide surface 32); when the paper roll is mounted in reverse, the photoelectric sensing module 41 is used to sense a second distance between the photoelectric sensing module 41 and the second section in the infrared light emission direction. When the paper roll diameter is the same, since the photoelectric sensing module 41 measures the distance from the photoelectric sensing module 41 to the paper roll when the paper roll is mounted upright, and measures the distance from the photoelectric sensing module 41 to the paper roll and the printing paper between the second guide surface when the paper roll is mounted in reverse, the second distance will be smaller than the first distance. The sensing module 40 can determine the movement path of the printing paper by the magnitude of the first or second distance.

[0028] The photoelectric sensing module 41 includes a photoelectric detection sensor and a photoelectric sensing circuit. The photoelectric detection sensor emits infrared light and receives reflected infrared light, while the photoelectric sensing circuit outputs a sensed voltage based on the time difference between the emitted and received infrared light. When the paper roll is mounted correctly, the photoelectric sensing circuit outputs a first voltage, corresponding to a first distance; when the paper roll is mounted incorrectly, the photoelectric sensing circuit outputs a second voltage, corresponding to a second distance. The printer's mainboard or MCU processor can determine whether the paper roll is mounted incorrectly based on the magnitude of the voltage output by the photoelectric sensing circuit.

[0029] For example, refer to the instruction manual appendix Figure 10In one example, the photoelectric sensor D1 includes an infrared emitter and receiver. VCC_IN powers the emitter of sensor D1, typically around 3.3V. Depending on whether there is paper on the surface of sensor D1, or the distance of the paper, the infrared light emitted by the emitter is reflected by the paper (paper roll) to the receiver, resulting in different ADC voltage values. When the paper is close to the sensor surface (e.g., about 1 mm), the induced current after infrared light reflection is large, and the VADC voltage value is large, for example, around 3000mV. As the distance between the paper and the sensor increases, the VADC value decreases. When the distance increases (e.g., about 3 mm), the VADC value decreases significantly, for example, to 1500mV. The specific range may vary depending on the actual circuit and structural design. When the distance is further away or there is no paper, the VADC value approaches 0mV, for example, around 13mV. Based on this pattern, the printer motherboard or MCU processor can determine whether the paper roll inside the printer is mounted correctly, backwards, or without paper. In other embodiments, the photoelectric sensing circuit may also take other forms, such as the photoelectric sensing circuit outputting a lower voltage as the paper moves further away from the photoelectric sensor.

[0030] For example, in one example, the sensing module 40 includes a pressure sensing module 42; the pressure sensing module 42 is used to sense the pressure on the second guide surface 32; when the paper roll is mounted upright, the pressure sensed by the pressure sensing module 42 is zero; when the paper roll is mounted in reverse, the pressure sensed by the pressure sensing module 42 is greater than zero; the sensing module 40 can determine the movement path of the printing paper based on the pressure magnitude.

[0031] The pressure sensing module 42 can be a pressure sensor, a micro switch, or something similar; this application does not impose any limitations. For example, in one embodiment, the pressure sensing module 42 includes a micro switch and a pressure sensing circuit. When the paper roll is mounted correctly, the micro switch opens, and the pressure sensing circuit outputs no voltage or a third voltage. When the paper roll is mounted incorrectly, the micro switch closes, and the pressure sensing circuit outputs a fourth voltage. The printer's mainboard or MCU processor can determine whether the paper roll is mounted incorrectly based on the magnitude of the voltage output by the photoelectric sensing circuit. For example, refer to the attached manual. Figure 11When the printing paper roll is reversed, the paper presses down on the micro switch S1, triggering the PAPER_DETECT detection signal to output a low level to the MCU main control chip. The MCU then determines that the printing paper roll is reversed. When there is no pressure, the micro switch S1 opens, and the PAPER_DETECT detection signal outputs a high level to the MCU main control chip. It is worth noting that since the diameter of the printing paper roll may be different, or the paper roll put into the printer may be partially used, when the paper presses down on the micro switch, it can be determined that the paper roll is reversed; however, when the micro switch S1 opens, it does not necessarily mean that the paper roll is upright. It may still be reversed, but the printing paper is not in contact with the second guide surface 32. To address this situation, two measures can be taken. The first measure is to set the pressure sensing module 42 and the photoelectric sensing module 41 to share the same module. The pressure sensing module 42 is used first to determine whether the printing paper roll is reversed, and when the micro switch S1 opens, the photoelectric sensing module 41 is used for further judgment. Of course, the pressure sensing module 42 and the photoelectric sensing module 41 can also be used simultaneously to improve detection accuracy. For example, when the printing paper roll is reversed, the paper will press against the micro switch S1, triggering the detection signal PAPER_DETECT to output a low level to the MCU main control chip. The MCU determines that the printing paper roll is currently reversed. At the same time, the paper is close to the surface of the photoelectric detection sensor, and the obtained VADC voltage value is large, which further confirms that the printing paper roll is reversed. When the diameter of the reversed printing paper roll is very small, the micro switch will change to open, and the detection signal PAPER_DETECT will be pulled up to VCC_IN by resistor R3, outputting a high level to the MCU main control chip. The MCU cannot accurately determine whether the printing paper is reversed, but at this time the paper is far from the surface of the photoelectric detection sensor, and the obtained VADC voltage value is small, which can also determine that the printing paper is reversed. The first measure is to use a physical structure to ensure that the printing paper can still adhere to the second guide surface 32 when the paper roll is reversed. For example, the guide plate 30 is configured to include two perpendicular guide pieces, with the first guide surface 31 and the second guide surface 32 being the surfaces of the two guide pieces respectively. The two guide pieces are movably connected, with one end of the two guide pieces rotatably connected and the other end connected by an elastic element such as a spring. This allows the printing paper to still adhere to the second guide surface 32 and move when the paper roll is reversed, even if the diameters of the paper rolls are different, so that it can be detected by the pressure sensing module 42.

[0032] In one embodiment, based on the foregoing embodiments, refer to the appendix to the specification. Figure 1 To be continued Figure 9The printer includes a motherboard 12, a printing module 13, and an alert module 14. The motherboard 12 includes an MCU main control chip, an operation screen, etc., to facilitate user settings of printing information and parameters. The motherboard 12 is fixed to the housing 10 using motherboard screws 15. The motherboard 12 is electrically connected to the printing module 13 and is used to control the printing module to print on the paper. The printing module 13 is fixed to the housing 10 using fixing screws 17. The motherboard 12 is electrically connected to the sensing module 40 and is used to receive the sensing voltage from the sensing module 40 and determine whether the paper roll is reversed based on the sensing voltage. When the paper roll is determined to be reversed, an alert is issued via the alert module 14, which can be a speaker, loudspeaker, etc.

[0033] Preferably, the anti-reverse mounting structure of the paper roll further includes a flexible circuit board 50, which is electrically connected to the main board 12. The flexible circuit board 50 is movably mounted on the flip cover 20, and the flexible circuit board 50 includes a protrusion. The sensing module 40 is mounted on the protrusion. When the housing 10 and the flip cover 20 are engaged, the protrusion can fit against the second guide surface 32 to perform paper roll detection.

[0034] The anti-reverse mounting structure for the paper roll also includes an adapter circuit board 60, a flexible circuit board 50 including connecting copper pillars 51, an adapter circuit board 60 including an adapter connector 61, and a main board spring 16 on the main board 12. The bracket 11 is detachably connected to the housing 10, and when the bracket 11 is fixed to the housing 10, the adapter circuit board 60 contacts the main board spring 16, allowing the adapter circuit board 60 to be electrically connected to the main board 12. When the housing 10 and the flip cover 20 are engaged, the connecting copper pillars 51 and the adapter connector 61 make contact and conduction, allowing the flexible circuit board 50 to be electrically connected to the adapter circuit board 60, and then to the main board 12. This enables the sensing module 40 to collect signals and send the collected data to the main board 12, so that the main board 12 can determine whether the paper roll is reversed based on the collected data, and when the reverse mounting is detected, it will remind the user through the reminder module 14.

[0035] In one embodiment, this application provides a printer including a paper roll anti-reverse mounting structure as described in the foregoing embodiments. The technical concept of this printer is the same as that of the paper roll anti-reverse mounting structure in the foregoing embodiments, and will not be described in detail here.

[0036] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A paper roll anti-reverse mounting structure for a printer, characterized in that, The application is applied to a printer, comprising: a guide plate arranged in the printer for guiding a printing paper, the guide plate comprising a first guide surface and a second guide surface, an angle being formed between the first guide surface and the second guide surface, the first guide surface being close to a paper outlet of the printer, and the second guide surface being close to a paper roll arranged in the printer; when the paper roll is arranged in a normal mode, the printing paper moves along the first guide surface towards the paper outlet; when the paper roll is arranged in a reverse mode, the printing paper moves along the second guide surface and the first guide surface in sequence towards the paper outlet; the second guide surface is provided with a sensing module, the sensing module being used for sensing a moving path of the printing paper and judging whether the paper roll is arranged in the reverse mode according to the moving path.

2. The anti-reverse winding structure of a printer paper roll according to claim 1, wherein a part of the printing paper between the paper roll and the paper outlet comprises a first section and a second section; when the paper roll is arranged in the normal mode, the first section is attached to the first guide surface, and an angle between the second section and the first section is 180°; when the paper roll is arranged in the reverse mode, the first section is attached to the first guide surface, and the second section is attached to the second guide surface; or, the first section is attached to the first guide surface, and an angle between the second section and the first section is less than 180°.

3. The anti-reverse winding structure of a printer paper roll according to claim 2, wherein the sensing module comprises an optoelectronic sensing module; when the paper roll is arranged in the normal mode, the optoelectronic sensing module is used for sensing a first distance between the optoelectronic sensing module and the paper roll in an infrared light emitting direction; when the paper roll is arranged in the reverse mode, the optoelectronic sensing module is used for sensing a second distance between the optoelectronic sensing module and the second section in the infrared light emitting direction; when diameters of the paper roll are the same, the second distance is less than the first distance; the sensing module judges the moving path of the printing paper according to the first distance or the second distance.

4. The reverse mounting preventing structure for a printer paper roll according to claim 2, wherein the sensing module comprises a pressure sensing module; the pressure sensing module is used for sensing a pressure on the second guide surface; when the paper roll is arranged in the normal mode, the pressure sensing module senses a pressure of zero; when the paper roll is arranged in the reverse mode, the pressure sensing module senses a pressure greater than zero; the sensing module judges the moving path of the printing paper according to the pressure.

5. The reverse mounting preventing structure for a printer paper roll according to claim 3, wherein the optoelectronic sensing module comprises an optoelectronic detection sensor and an optoelectronic sensing circuit, the optoelectronic detection sensor being used for emitting infrared light and receiving reflected infrared light, and the optoelectronic sensing circuit being used for outputting a sensing voltage according to a time difference between the optoelectronic detection sensor emitting the infrared light and receiving the reflected infrared light; when the paper roll is arranged in the normal mode, the optoelectronic sensing circuit outputs a first voltage, the first voltage corresponding to the first distance; when the paper roll is arranged in the reverse mode, the optoelectronic sensing circuit outputs a second voltage, the second voltage corresponding to the second distance.

6. The reverse mounting preventing structure for a printer paper roll according to claim 4, wherein the pressure sensing module comprises a micro switch and a pressure sensing circuit, when the paper roll is arranged in the normal mode, the micro switch is opened, and the pressure sensing circuit outputs no voltage or a third voltage; when the paper roll is arranged in the reverse mode, the micro switch is closed, and the pressure sensing circuit outputs a fourth voltage.

7. A reverse mounting preventing structure for a printer paper roll according to any one of claims 1 to 6, wherein The printer comprises a main board, a printing module and a reminding module, the main board is electrically connected with the printing module, and is used for controlling the printing module to print on the printing paper; The main board is electrically connected with the induction module, is used for receiving an induction voltage of the induction module and judging whether the paper roll is reversely installed according to the induction voltage, and is used for reminding through the reminding module when judging that the paper roll is reversely installed.

8. The anti-reverse winding structure of a printer paper roll according to claim 7, wherein Further comprising a flexible circuit board, the flexible circuit board is electrically connected with the main board; The printer comprises a shell and a flip cover, the shell is provided with a containing cavity, the containing cavity is provided with a support for placing the paper roll; one end of the flip cover is rotationally connected with the shell, and the other end is clampedly connected with the shell; The flexible circuit board is movably mounted on the flip cover, and the flexible circuit board comprises an extension part, the induction module is mounted on the extension part, and the extension part is attached to the second guide surface when the shell and the flip cover are clamped.

9. The anti-reverse winding structure of a printer paper roll according to claim 8, wherein Further comprising a conversion circuit board, the flexible circuit board comprises a connecting copper column, the conversion circuit board comprises a conversion connector, and the main board is provided with a main board spring piece; The support is detachably connected with the shell, and the conversion circuit board is in contact with the main board spring piece when the support is fixed on the shell, so that the conversion circuit board is electrically connected with the main board; When the shell and the flip cover are clamped, the connecting copper column is in contact with the conversion connector and is conducted, so that the flexible circuit board is electrically connected with the conversion circuit board, and further is electrically connected with the main board.

10. A printer characterized by comprising: The printer paper roll anti-reverse installation structure comprises the printer paper roll anti-reverse installation structure according to any one of claims 1-9.

Images