A paper amount detecting mechanism

Abstract

The utility model discloses a paper amount detection mechanism, including machine body, paper lifting board, first biasing member, indicating part and second biasing member. Paper lifting board is suitable for supporting several paper to store paper, and the both ends of first biasing member act on machine body and paper lifting board respectively, and force is applied to paper lifting board to make paper lifting board move to the direction of approaching paper roller, so that the uppermost layer paper can contact with paper roller, indicating part is suitable for moving relative to machine body, and the both ends of second biasing member act on machine body and indicating part respectively, and force is applied to indicating part to make indicating part and paper lifting board always abut along the vertical direction, so that when the paper amount on paper lifting board changes, paper lifting board moves, and indicating part moves along with the movement of paper lifting board, and machine body is equipped with the hole of showing along the vertical direction extension, and indicating part is equipped with the indicating part of showing in the hole of showing, when indicating part moves, the indicating part also moves correspondingly, and user can know the current paper amount by observing the position of indicating part in the hole of showing, so as to replace.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment, specifically to a paper quantity detection mechanism. Background Technology

[0002] In the prior art, the indicator is rotatably connected to the paper lifting board so that it rotates with the paper lifting board. The indicator has a corresponding indicator part exposed in the display hole to realize the corresponding paper quantity detection. However, since the indicator is rotatably connected to the paper lifting board, the indicator needs to be driven to move synchronously during the movement of the paper lifting board. When the elastic element is lifting the paper, the force required for the paper lifting board is greater, and the movement is prone to jamming due to the transmission connection, which is not conducive to paper feeding. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems existing in the background art or to provide a material basis for overcoming the above-mentioned defects or problems existing in the background art, and to provide a paper quantity detection mechanism.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions: Option 1: A paper quantity detection mechanism, including... The body has a visible opening extending in a vertical direction; A paperboard support, suitable for supporting several sheets of paper; The first biasing member has two ends that act on the machine body and the lifting plate respectively, so that the lifting plate moves toward the paper feed roller; An indicator having an indicator portion exposed through a display hole, the indicator being adapted to move relative to the body; The second biasing element acts on the machine body and the indicator at both ends, so that the indicator and the lifting plate are always in contact in the vertical direction.

[0005] Option 2, based on Option 1, the machine body is provided with at least one paper quantity indicator, which is arranged vertically on the side of the display hole.

[0006] Option 3, based on Option 1, also includes a sensor, which is installed on the machine body. The indicator or the lifting plate is provided with a sensing part, and the sensor is adapted to output different signals when the position of the sensing part is different.

[0007] Option 4, based on Option 3, the sensing unit includes at least two reflective surfaces with different reflectivities, the sensor is adapted to emit light, and is adapted to output different signals when receiving light reflected by the reflective surfaces with different reflectivities.

[0008] Option 5, based on Option 3, includes at least two reflective surfaces at different distances from the sensor. The sensor is adapted to emit light and to output different signals when receiving light reflected from the reflective surfaces at different distances.

[0009] Option 6, based on Option 3, wherein the sensing part is formed by a magnet, and the sensor is adapted to output different signals according to the different magnetic fields applied to the magnet at different positions.

[0010] Option 7, based on Option 6, involves the indicator and the lifting plate being rotatably connected to the machine body along an axis parallel to the first direction, and the sensor being located in the first direction or vertical direction of the magnet, with the first direction being perpendicular to the vertical direction.

[0011] Option 8, based on Options 3 to 7, the machine body includes a paper tray and a frame, the paper lifting device, the first biasing component, the indicator, and the second biasing component are installed in the paper tray; the paper tray has an exposure hole and is adapted to be inserted into the frame; the sensor is installed in the frame.

[0012] Option 9, based on Option 4 or Option 5, wherein the body is provided with a clearance hole, and the sensing part and the sensor are respectively located on both sides of the clearance hole.

[0013] Option 10, based on Option 1, wherein the indicator rotates about an axis parallel to the first direction, the indicator includes an annular shielding wall, the indicator part is connected to the annular shielding wall, and the annular shielding wall is adapted to shield the exposure hole; the surface of the indicator that abuts against the lifting plate is an arc surface.

[0014] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means: Through continuous observation, experimentation, and research, the applicant has determined that the reason for the technical problem in the existing technical solutions lies in the following: A paper quantity detection mechanism includes a body, a paper lifting plate, a first biasing element, an indicator element, and a second biasing element.

[0015] The lifting plate is suitable for supporting several sheets of paper for storage. The two ends of the first biasing member act on the machine body and the lifting plate respectively, and apply force to the lifting plate so that the lifting plate moves towards the paper feed roller so that the top layer of paper can contact the paper feed roller. The indicator is adapted to move relative to the machine body. The second biasing element acts on both ends of the machine body and the indicator, applying force to the indicator to ensure it remains in contact with the lifting plate in the vertical direction. This allows the lifting plate to move when the paper level changes, and the indicator moves accordingly. The machine body has a vertically extending display hole, and the indicator has an indicator portion protruding from this hole. When the indicator moves, the indicator portion moves accordingly. The user can determine the current paper level by observing the position of the indicator portion at the display hole, facilitating paper replacement. The contact between the indicator and the lifting plate facilitates independent maintenance and simplifies assembly. Both can move independently; even if the indicator jams, the lifting plate can still move independently. Furthermore, the lifting plate does not require additional machining to connect with the indicator, allowing the use of existing lifting plates and enhancing compatibility. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Machine body 1; Frame 11; Paper tray 12; Display hole 121; Paper quantity indicator 122; Clearance hole 123; Lifting board 2; First biasing component 3; Indicator 4; Indicator part 41; Sensor part 42; Reflective surface 421; Rotating shaft 43; First connecting wall 44; Second connecting wall 45; Annular shielding wall 46; Abutting part 47; Actuating part 48; Second biasing component 5; Sensor 6; Vertical direction 71; First direction 72; Front and rear direction 73; Figure 1 This is a perspective view of the paper quantity detection mechanism in Example 1; Figure 2 This is a perspective view of the paper compartment in Example 1; Figure 3 for Figure 2 Enlarged view of the marked area; Figure 4 This is a schematic diagram of the paper quantity detection mechanism in Example 1; Figure 5 This is a perspective view of the first type of indicator in Embodiment 1; Figure 6 This is a schematic diagram of the sensor located on the rack in Embodiment 1; Figure 7 This is a perspective view of the second type of indicator in Embodiment 1; Figure 8 This is a perspective view of the third type of indicator in Embodiment 1; Figure 9This is a perspective view of the fourth type of indicator in Embodiment 1; Figure 10 This is a schematic diagram illustrating the use of the fourth type of indicator in Embodiment 1; Figure 11 This is a schematic diagram of the sensing principle of the fourth type of indicator and sensor in Embodiment 1.

[0018] Explanation of key figure labels: Detailed Implementation The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0020] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of the invention.

[0021] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0022] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0023] refer to Figures 1-11 A paper quantity detection mechanism includes a body 1, a paper lifting board 2, a first biasing component 3, an indicator 4, a second biasing component 5, and a sensor 6.

[0024] The machine body 1 includes a paper tray 12 and a frame 11. The frame 11 is the main component and is mainly used to install parts such as paper feed rollers and print heads.

[0025] The paper tray 12 is used for mounting the lifting board 2, the first biasing member 3, the indicator 4, and the second biasing member 5. The paper tray 12 is inserted into the machine body 1 along the front-rear direction 73 to achieve assembly. In other embodiments, the machine body 1 may only include the paper tray 12.

[0026] refer to Figure 1 The paper tray 12 has a display hole 121 on its front side (with the direction in which the paper tray 12 is pulled out of the machine body 1 as the front), and the display hole 121 extends in the vertical direction 71. The paper tray 12 has at least one paper quantity indicator 122, which is arranged in the vertical direction 71 next to the display hole 121. In this embodiment, there are two paper quantity indicators 122, namely a full paper indicator and a low paper indicator, with the full paper indicator located above the low paper indicator. In other embodiments, there may be only one paper quantity indicator 122, such as only a full paper indicator or a low paper indicator.

[0027] refer to Figure 2 The lifting plate 2 is installed on the machine body 1 and is adapted to support a number of sheets of paper. In this embodiment, the lifting plate 2 is rotatably connected to the paper tray 12 about an axis parallel to the first direction 72, which is perpendicular to the vertical direction 71 and perpendicular to the front-back direction 73. In other embodiments, the lifting plate 2 may also be slidably connected to the paper tray 12 along the vertical direction 71.

[0028] The two ends of the first biasing member 3 act on the machine body 1 and the lifting plate 2 respectively, so that the lifting plate 2 moves towards the paper feed roller. In this embodiment, the first biasing member 3 is a spring and is installed below the lifting plate 2. The two ends of the first biasing member 3 along the vertical direction 71 abut against the paper bin 12 and the lifting plate 2 respectively.

[0029] refer to Figure 1 The indicator 4 is mounted on the machine body 1. The indicator 4 has an indicator portion 41 protruding from the display hole 121. The indicator portion 41 can be a groove or a protrusion located within the display hole 121, or it can use lines with a different color from other parts to serve as scale lines indicating the current paper quantity. The indicator 4 is adapted to move relative to the machine body 1; therefore, the position of the indicator portion 41 will change, indicating a change in the paper quantity. Specifically, in this embodiment, the indicator 4 is rotatably connected to the paper tray 12 about an axis parallel to the first direction 72. In other embodiments, the indicator 4 can be slidably connected to the paper tray 12 along the vertical direction 71. (See reference...) Figure 5Specifically, the indicator 4 includes a rotating shaft 43, a first connecting wall 44, a second connecting wall 45, an annular blocking wall 46, an indicator part 41, and an abutment part 47. The rotating shaft 43 is used for rotatably connecting with the paper tray 12 and for fitting into the central hole of the second biasing member 5. The first connecting wall 44 protrudes radially along the rotating shaft 43 and connects the annular blocking wall 46 and the rotating shaft 43. The annular blocking wall 46 is adapted to block the exposure hole 121 so that when the indicator 4 rotates, only the indicator 4 can be seen in the exposure hole 121. The indicator part 41 is connected to the annular blocking wall 46 and protrudes from the annular blocking wall 46. The end of the annular blocking wall 46 is provided with an abutment part 48 for one end of the second biasing member 5 to abut. The second connecting wall 45 protrudes radially along the rotating shaft 43 and connects the rotating shaft 43 and the abutment part 47. The abutment part 47 and the second connecting wall 45 extend at an angle. The abutment part 47 abuts against the lifting plate 2, and the surface abutting against the lifting plate 2 is an arc surface, such as a spherical surface or a curved surface.

[0030] refer to Figure 4 The two ends of the second biasing member 5 act on the machine body 1 and the indicator 4 respectively, so that the indicator 4 and the lifting paperboard 2 always abut against each other in the vertical direction 71. In this embodiment, the second biasing member 5 is a torsion spring, and acts on the paper tray 12 and the indicator 4 respectively, so that the indicator 4 abuts against the lower end of the lifting paperboard 2 (in other embodiments, it can also abut against the upper end of the lifting paperboard 2), so that the indicator 4 moves with the movement of the lifting paperboard 2, thereby enabling the indicator part 41 to display the current paper quantity.

[0031] The indicator unit 41 allows the paper level to be determined by observing the printer's appearance, but it cannot provide real-time monitoring in the background. Therefore, this solution achieves corresponding monitoring through the cooperation of sensor 6 and sensing unit 42.

[0032] Sensor 6 is installed on the body 1, and the indicator 4 or the lifting plate 2 is provided with a sensing part 42. Sensor 6 is adapted to output different signals when the position of the sensing part 42 is different.

[0033] Specifically, the following methods can be used: Method 1: refer to Figure 2 , Figure 3 The paper tray 12 has a clearance hole 123 extending through the side wall of the paper tray 12 along the first direction 72. The clearance hole 123 allows light emitted from the sensor 6 to pass through. (Reference) Figure 5The sensing unit 42 is connected to the second connecting wall 45. The sensing unit 42 includes at least two reflective surfaces 421 with different reflectivities. In this design, taking the rotation of the indicator 4 and the lifting cardboard 2 as an example, each reflective surface 421 is arranged circumferentially. If it is a sliding mechanism, they can be arranged vertically 71. The sensor 6 is mounted on the frame 11 of the machine body 1, and when the paper tray 12 is inserted into the machine body 1, the sensing unit 42 and the sensor 6 are respectively located on both sides of the clearance hole 123. The sensor 6 is adapted to emit light, which passes through the clearance hole 123 and reaches the reflective surface 421. The reflective surface 421 reflects part of the light. When the sensor 6 receives light reflected by the reflective surfaces 421 with different reflectivities, it outputs different signals.

[0034] The printer can be configured with three reflective surfaces 421 of different reflectivities to provide three paper weight levels: high, medium, and low. The reflective surfaces 421 can be set to different reflectivities through methods such as patching or spraying. The sensor 6 can be a reflective photoelectric pair; for different paper weights, a corresponding reflective surface 421 corresponds to the photoelectric pair. Different electrical signal parameters can be obtained based on the different reflectivities, thus informing the user of the printer's paper weight status and achieving real-time detection.

[0035] Method 2: refer to Figure 7 The sensing unit 42 includes at least two reflective surfaces 421 at different distances from the sensor 6. The sensor 6 is adapted to emit light and to output different signals when receiving light reflected from the reflective surfaces 421 at different distances.

[0036] Unlike method one, this solution transforms the difference in reflectivity into a difference in reflection distance. For example, the sensing unit 42 can be configured as a multi-step structure, with each step arranged along the circumference, and the surface facing the sensor 6 serving as the reflective surface 421. For the photoelectric pair, different reflection distances generate different voltages, and different paper amounts correspond to different positions, thereby achieving the detection of paper amount.

[0037] Method 3: refer to Figure 8 Unlike the two methods mentioned above, this scheme uses Hall effect detection, and therefore does not require the clearance hole 123. Specifically, the sensing part 42 is formed by a magnet, and the sensor 6 is adapted to generate different voltages and output different signals according to the different magnetic fields (variations in magnetic field strength) applied to it by the magnet at different positions. In this scheme, the sensor 6 is located on the first direction 72 of the magnet.

[0038] Method 4: refer to Figures 9-11 To account for greater distance variations, the horizontal layout in Method 3 is changed to a vertical layout, so that sensor 6 is located on the vertical direction 71 of the magnet, as shown above.

[0039] In use, as the paper is consumed, the lifting board 2 rises under the action of the first biasing member 3 as the paper quantity decreases. The indicator 4 also rotates under the action of the second biasing member 5, ensuring that it is always pressed against the lifting board 2. At this time, not only can the current paper quantity be known by visually observing the indicator part 41 exposed in the display hole 121, but the current paper quantity can also be obtained by converting the signal output by the sensor 6 into visible electronic information (such as indicator light display or display screen display). At the same time, the output signal of the sensor 6 can also realize the function of real-time monitoring of paper quantity in the background.

[0040] Compared with the prior art, this embodiment has the following beneficial effects: In one exemplary embodiment, a paper quantity detection mechanism includes a body 1, a paper lifting board 2, a first biasing member 3, an indicator 4, and a second biasing member 5.

[0041] The lifting plate 2 is suitable for supporting several sheets of paper for storing paper. The two ends of the first biasing member 3 act on the machine body 1 and the lifting plate 2 respectively, and apply force to the lifting plate 2 so that the lifting plate 2 moves towards the paper feed roller so that the uppermost sheet of paper can contact the paper feed roller. The indicator 4 is adapted to move relative to the machine body 1. The second biasing member 5 acts on the machine body 1 and the indicator 4 at both ends, and applies force to the indicator 4 so that the indicator 4 and the lifting plate 2 are always in contact along the vertical direction 71. When the amount of paper on the lifting plate 2 changes, the lifting plate 2 moves, and the indicator 4 moves with the lifting plate 2. The machine body 1 is provided with a display hole 121 extending along the vertical direction 71. The indicator 4 is provided with an indicator part 41 exposed in the display hole 121. When the indicator 4 moves, the indicator part 41 also moves accordingly. The user can know the current amount of paper by observing the position of the indicator part 41 at the display hole 121, so as to facilitate replacement. The indicator 4 and the lifting plate 2 are in contact, which facilitates independent maintenance and simplifies assembly. The two can move independently. Even if the indicator 4 is stuck, the lifting plate 2 can still move independently. Furthermore, the lifting plate 2 does not need to be specially processed to connect with the indicator 4. Existing lifting plate 2 can be used, which has stronger compatibility.

[0042] In one exemplary embodiment, the machine body 1 is provided with at least one paper quantity indicator 122, which is arranged in the vertical direction 71 on the side of the display hole 121, so that the user who is using it for the first time can know the meaning of the indicator 41 and know which direction the indicator 41 moves to reduce the paper quantity, so as to facilitate use.

[0043] In one exemplary embodiment, the indicator 41 allows the paper level to be determined by observing the printer's appearance, but it cannot achieve real-time background monitoring. This is addressed by including a sensor 6 mounted on the machine body 1. The indicator 4 or the paper lifting plate 2 is equipped with a sensing element 42. The sensor 6 is adapted to output different signals depending on the position of the sensing element 42, thereby enabling real-time background monitoring by using the different output signals to represent the amount of paper. When the indicator 4 has a sensing element 42, the indicator 4 can both observe the paper level and assist in background monitoring without adding extra parts, resulting in lower costs.

[0044] In one exemplary embodiment, the sensing unit 42 includes at least two reflective surfaces 421 with different reflectivities. The sensor 6 is adapted to emit light and to output different signals when receiving light reflected from reflective surfaces 421 with different reflectivities. By using the difference in reflectivity, different signals can be output, which is simple and convenient.

[0045] In one exemplary embodiment, the sensing unit 42 includes at least two reflective surfaces 421 at different distances from the sensor 6. The sensor 6 is adapted to emit light and to output different signals when receiving light reflected from the reflective surfaces 421 at different distances. By varying the distances between the reflective surfaces 421 and the sensor 6, different signals can be output, which is simple and convenient.

[0046] In one exemplary embodiment, the sensing part 42 is formed by a magnet, and the sensor 6 is adapted to output different signals according to the different magnetic fields applied to it by the magnet at different positions. The detection is achieved through the Hall effect principle, which is simple and convenient, and does not require the setting of a corresponding reflective surface 421, making the processing simpler.

[0047] In one exemplary embodiment, the indicator 4 and the lifting plate 2 are both rotatably connected to the body 1 along an axis parallel to the first direction 72. The rotatable connection occupies less space than sliding. The sensor 6 is located on the first direction 72 or the vertical direction 71 of the magnet. The first direction 72 is perpendicular to the vertical direction 71. When the sensor 6 is located on the vertical direction 71 of the magnet, it can monitor a larger distance change.

[0048] In one exemplary embodiment, the machine body 1 includes a paper tray 12 and a frame 11. The paper tray 2, the first biasing component 3, the indicator 4, and the second biasing component 5 are installed on the paper tray 12. The paper tray 12 is provided with an exposure hole 121 and is adapted to be inserted into the frame 11 for installation. Installing the corresponding mechanical components on the paper tray 12 allows for more direct and accurate measurement of the corresponding paper quantity. The sensor 6 is installed on the frame 11 so as to be electrically connected to other parts on the frame 11, such as control components, display screens, power supplies, etc. The corresponding circuits will not be damaged due to frequent pulling of the paper tray 12.

[0049] In one exemplary embodiment, the body 1 is provided with a clearance hole 123, and the sensing part 42 and the sensor 6 are respectively located on both sides of the clearance hole 123. The clearance hole 123 limits the range of light emission and light reception to prevent monitoring from being interfered with by other light.

[0050] In one exemplary embodiment, the indicator 4 rotates about an axis parallel to the first direction 72. The indicator 4 includes an annular shielding wall 46, and the indicator part 41 is connected to the annular shielding wall 46. The annular shielding wall 46 is adapted to shield the exposed hole 121 so that only the indicator 4 can be observed during the rotation of the indicator 4, ensuring aesthetics. It also provides a certain degree of sealing during the rotation of the indicator 4, preventing air and water ingress. The surface of the indicator 4 that abuts against the lifting plate 2 is an arc surface, allowing for point or line contact with the lifting plate 2, making it smoother when the lifting plate 2 pushes the indicator 4 to rotate.

[0051] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A paper quantity detection mechanism, characterized in that: include The body (1) has an exposure hole (121) extending in the vertical direction (71). The cardboard (2) is suitable for supporting several sheets of paper; The first biasing member (3) acts on the machine body (1) and the lifting plate (2) at its two ends respectively, so that the lifting plate (2) moves toward the paper feed roller; An indicator (4) having an indicator portion (41) exposed in a display hole (121) is adapted to move relative to the body (1); The second biasing member (5) acts on the machine body (1) and the indicator (4) at both ends respectively, so that the indicator (4) and the lifting plate (2) are always in contact in the vertical direction (71).

2. The paper quantity detection mechanism as described in claim 1, characterized in that: The machine body (1) is provided with at least one paper quantity mark (122), which is arranged in the vertical direction (71) on the side of the display hole (121).

3. The paper quantity detection mechanism as described in claim 1, characterized in that: It also includes a sensor (6), which is mounted on the body (1). The indicator (4) or the lifting plate (2) is provided with a sensing part (42). The sensor (6) is adapted to output different signals when the position of the sensing part (42) is different.

4. The paper quantity detection mechanism as described in claim 3, characterized in that: The sensing unit (42) includes at least two reflective surfaces (421) with different reflectivities. The sensor (6) is adapted to emit light and to output different signals when receiving light reflected by the reflective surfaces (421) with different reflectivities.

5. The paper quantity detection mechanism as described in claim 3, characterized in that: The sensing unit (42) includes at least two reflective surfaces (421) at different distances from the sensor (6). The sensor (6) is adapted to emit light and to output different signals when receiving light reflected from the reflective surfaces (421) at different distances.

6. The paper quantity detection mechanism as described in claim 3, characterized in that: The sensing part (42) is formed of a magnet, and the sensor (6) is adapted to output different signals according to the different magnetic fields applied to the magnet at different positions.

7. The paper quantity detection mechanism as described in claim 6, characterized in that: The indicator (4) and the lifting plate (2) are rotatably connected to the body (1) along an axis parallel to the first direction (72). The sensor (6) is located in the first direction (72) or the vertical direction (71) of the magnet. The first direction (72) is perpendicular to the vertical direction (71).

8. A paper quantity detection mechanism as described in any one of claims 3-7, characterized in that: The machine body (1) includes a paper tray (12) and a frame (11). The lifting board (2), the first biasing member (3), the indicator (4), and the second biasing member (5) are installed in the paper tray (12). The paper tray (12) is provided with an exposure hole (121) and is adapted to be inserted into the frame (11). The sensor (6) is installed in the frame (11).

9. A paper quantity detection mechanism as described in claim 4 or 5, characterized in that: The body (1) is provided with a clearance hole (123), and the sensing part (42) and the sensor (6) are respectively located on both sides of the clearance hole (123).

10. The paper quantity detection mechanism as described in claim 1, characterized in that: The indicator (4) rotates about an axis parallel to the first direction (72). The indicator (4) includes an annular shielding wall (46). The indicator part (41) is connected to the annular shielding wall (46). The annular shielding wall (46) is adapted to shield the exposure hole (121). The surface of the indicator (4) that abuts against the lifting plate (2) is an arc surface.

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