Novel printer

Abstract

The utility model provides a novel printer which comprises a base, a printing head, a rubber roller and a motor set used for driving the rubber roller to suck paper, an upper cover capable of rotating relative to the base is installed on the base, and a cover opening clamping hook mechanism is installed on the base. The uncovering clamping hook mechanism comprises two clamping hooks which are installed on the two sides of the installation cavity of the base respectively, and the clamping hooks can rotate relative to the base. The upper cover is provided with two clamping blocks matched with the clamping hooks, the cover opening clamping hook mechanism further comprises a clamping hook driving piece, a transmission piece for driving the two clamping hooks to rotate synchronously is arranged between the two clamping hooks, and a compression spring is arranged between the clamping hooks or the clamping hook driving piece and the base. The stable pressure spring force value can guarantee that the reset force of the two clamping hooks is consistent, the traditional piece can guarantee that the acting force of the two pressure springs is averagely transmitted to the two clamping hooks, the hand feeling is consistent when the clamping hooks are pressed and driven to rotate to be separated from the clamping blocks, and the cover opening experience is guaranteed. The compression spring can be installed only by being connected between the clamping hook and the base, production and assembly are facilitated, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a new type of printer. Background Art

[0002] Portable printers currently on the market usually require users to open the top cover of the printer when facing paper replacement or maintenance needs. Existing printer top cover designs often include an opening structure, which mainly relies on two independent hooks and two corresponding card blocks to achieve fixing and unlocking. However, in order to drive the two hooks to disengage from the card blocks separately, two independent driving parts have to be installed on the printer housing.

[0003] In order to realize the automatic reset function of the hook when it is not subject to external force, designers usually set a torsion spring between the hook and the base. However, even for torsion springs of the same model, their force values ​​are often difficult to be completely consistent due to slight differences in the production process. This inconsistency directly leads to the fact that users may feel a significant difference in the driving feel of the left and right hooks when using it, and may even encounter the problem that one side of the hook cannot be reset smoothly. This undoubtedly reduces the user experience and increases the complexity of operation. In addition, the torsion spring usually needs to be installed at the rotating shaft of the hook, and it must have two limit blocks to limit the two ends of the torsion spring, so that the torsion spring can work normally. The installation is more complicated and the structural design is also more cumbersome. Utility Model Content

[0004] To solve the above problems, the purpose of the utility model is to provide a new type of printer.

[0005] The utility model is realized by the following method: a novel printer comprises a base and an upper cover assembly, the base is provided with a rubber roller, the upper cover assembly comprises an upper cover and a print head arranged on the upper cover, and a motor group for driving the rubber roller to suck paper, the base is provided with the upper cover which can rotate relative to the base, and the base is provided with an open cover hook mechanism; the open cover hook mechanism comprises two hooks which are respectively installed on both sides of the installation cavity of the base, and the hooks can rotate relative to the base; the upper cover is provided with two blocks which cooperate with the hooks, the open cover hook mechanism also comprises a hook driving member, the hook transmission member which drives the two hooks to rotate synchronously is arranged between the two hooks, the hook transmission member deviates from the rotation axis of the hook, a compression spring is arranged between the hook or the hook driving member and the base, and the compression spring is used to provide the hook driving member or the hook with a force for the hook to reset and hook the block.

[0006] Preferably, an abutment block is provided on the base at a position opposite to each of the hooks, one end of the compression spring is connected to a side of the abutment block close to the hook, and the other end of the compression spring abuts against the corresponding hook.

[0007] Preferably, the hook transmission member includes a transmission rod, and both ends of the transmission rod are respectively fixedly connected to one of the hooks; the hook driving member includes a button, and the button is telescopically installed on one side end surface of the base, and one end of the button is against the transmission rod. By pressing the button, the transmission rod is driven to drive the hook to rotate and disengage from the block.

[0008] Preferably, the hook includes a hook body rotatably installed in the base mounting cavity, the hook body is composed of a transmission part and a clamping part, a rotation hole is provided between the transmission part and the clamping part, the rotation hole and the base mounting cavity are rotationally connected through a first pin shaft, and a clamping groove adapted to the clamping block is provided at the bottom of the clamping part.

[0009] Preferably, a button hole is provided on the front end surface of the base, and the button is installed in the button hole. An end of the button in contact with the transmission rod is provided with an outwardly protruding first limiting ring. The aperture of the button hole at one end facing the transmission rod is smaller than the size of the button hole at one end away from the transmission rod, and the diameter of the first limiting ring is larger than the aperture of the button hole at one end facing the transmission rod.

[0010] Preferably, the base is provided with a paper feed channel connected to the rubber roller, a plurality of guide ribs are arranged at intervals on the bottom surface of the paper feed channel, a guide portion is provided on a side of the guide rib close to the rubber roller, and an upward curved surface is provided on the guide portion.

[0011] Preferably, a plurality of the guide ribs are arranged at intervals; the size of the guide ribs is gradually reduced in width from bottom to top; a transition portion is provided on the side of the guide rib away from the rubber roller, the transition portion is inclined downward from the side close to the rubber roller to the side away from the rubber roller, and the height of one end of the transition portion away from the rubber roller is flush with the height of the upper surface of the base; the upper curved surface of the guide portion is connected to a lower curved surface on the side close to the rubber roller, and the upper surface of one end of the lower curved surface close to the rubber roller is tangent to a surface parallel to the upper surface of the base.

[0012] Preferably, the base is provided with a paper feed channel connected to the rubber roller, and the paper feed channel is provided with a paper limiting mechanism, the paper limiting mechanism includes two paper limiting plates and a paper limiting driving component, the two paper limiting plates are symmetrically installed on both sides of the paper feed channel, the paper limiting driving component is installed in the base, and the two paper limiting plates are transmission-connected with the paper limiting driving component for driving the two paper limiting plates to approach or move away from each other.

[0013] Preferably, the paper feed channel is arranged on the surface of the base facing the upper cover, and the paper limiting piece driving component includes a driving gear and a driving rack. The driving gear is rotatably installed on the side of the base away from the paper feed channel, and the two driving racks are relatively installed on both sides of the driving gear and are respectively meshed with the driving gear. The two driving racks move in opposite directions, and the two driving racks are respectively connected to one paper limiting piece. The bottom surface of the paper feed channel is symmetrically provided with a clearance groove for the paper limiting piece to be connected and moved with the driving rack.

[0014] Preferably, a limiting rib is provided on the back side of the base on the moving trajectory of the driving rack, a second limiting protrusion is provided on the end of the driving gear away from the base, the limiting rib and the second limiting protrusion cooperate to prevent the driving rack from falling out, the driving rack is provided with a guide groove and / or a guide rib, and the back side of the base is provided with a guide rib and / or a guide groove, and the guide groove cooperates with the corresponding guide rib for guidance.

[0015] The beneficial effects of the utility model are: the utility model provides a new type of printer, compared with the prior art, the utility model has at least the following technical effects: 1. By providing a transmission part between the two hooks of the hook mechanism, the two hooks can move synchronously, and the compression spring is used instead of the torsion spring. The stable force value of the compression spring can ensure that the force of the two hooks to reset is consistent, and the existence of the traditional part can also ensure that the force of the two compression springs is evenly transmitted to the two hooks, that is, the feel of pressing the hook to rotate and disengage the block is consistent, ensuring a stable and consistent opening experience; and the compression spring only needs to be connected between the hook and the base to complete the installation, which is convenient for production and assembly to improve production efficiency. 2. Since one end of the compression spring abuts against the hook and the other end abuts against the abutment block on the base, there is no need to limit the axial position of the rotating shaft with the hook, so the installation accuracy requirements can be reduced, the dimensional accuracy requirements can be reduced, and it helps to improve production efficiency and reduce production costs. 3. The two hooks are fixedly connected by a transmission rod, so that the two hooks can rotate synchronously, and the feel of pressing the hook or the transmission rod can be consistent. 4. The button hole provided on the base facilitates the installation of the button. The first limiting convex ring on the button and the button hole have a reduced diameter toward one end of the transmission rod, which can ensure that the button will not fall off the base. 5. Guide ribs are provided on the surface of the paper feed channel on the base to reduce the contact area between the paper and the paper feed channel, which can reduce the resistance during paper feeding and make the paper feeding process smoother; the guide portion on the guide rib is set as a curved surface so that the paper can cut into the rubber roller along the tangential direction, so that the paper can be quickly absorbed by the rubber roller. 6. A paper limiting mechanism is provided, and the two paper limiting plates of the paper limiting mechanism can be driven by the paper limiting driving member to approach or move away from each other in the paper feed channel to meet the paper feeding requirements of papers of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of a new printer in a state after the upper cover is opened.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of a new type of printer of the utility model.

[0018] Figure 3 It is a schematic diagram of the state of the base of a new printer of the utility model being installed with a corresponding mechanism.

[0019] Figure 4 The utility model is a schematic diagram of a state in which a cover-opening hook mechanism is installed on a base of a novel printer.

[0020] Figure 5 The utility model is a cross-sectional view of the connection relationship between a card hook, a base and a card block of a new printer.

[0021] Figure 6 It is a structural schematic diagram of the hook cover opening mechanism of the utility model.

[0022] Figure 7 It is a structural schematic diagram of the utility model in which ribs are arranged on the base.

[0023] Figure 8 It is a schematic diagram of the cross-section state of ribs arranged on the base of the utility model.

[0024] Fig. 9 yes Figure 8 A local enlarged schematic diagram of point A in the middle.

[0025] Fig.10 It is a schematic diagram of the status of the paper feeding channel on the base when feeding paper.

[0026] Fig.11 It is a structural schematic diagram of a paper limiting mechanism installed on the back of a base.

[0027] Fig.12 It is a structural schematic diagram of the paper limiting mechanism.

[0028] Fig.13 It is a schematic diagram of the base being provided with limiting ribs, guide grooves, and guide ribs.

[0029] Explanation of the accompanying drawings: 1. Base; 11. Abutment block; 12. Print head; 13. Give way groove; 14. Paper feed channel; 15. Key hole; 2. Paper; 3. Rubber roller; 4. Motor unit; 5. Upper cover; 51. Block; 6. Open cover hook mechanism; 61. Hook; 611. Hook body; 612. Transmission part; 613. Connecting part; 614. Rotating hole; 615. Slot; 62. Hook driving member; 63. Hook transmission member; 64. Compression spring; 7. Guide rib; 71. Guide part; 72. Transition part; 8. Paper limiting mechanism; 81. Paper limiting piece; 82. Driving gear; 83. Driving rack; 84. Guide rib; 85. Guide slot; 86. Limiting rib; 9. Sensor; 10. Battery. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] See also Figures 1 to 13 A novel printer includes a base 1 and an upper cover assembly, wherein the base 1 is provided with a rubber roller 3, the upper cover assembly includes an upper cover 5 and a print head 12 provided on the upper cover 5, and a motor group 4 for driving the rubber roller 3 to suck paper, the upper cover 5 which can rotate relative to the base 1 is installed on the base 1, and an opening hook mechanism 6 is installed on the base 1; the opening hook mechanism 6 includes two hooks 61 respectively installed on both sides of the installation cavity of the base 1, and the hook 61 can rotate relative to the base 1; the upper cover 5 There are two blocks 51 matched with the hooks 61, and the cover opening hook mechanism 6 also includes a hook driving member 62. A hook transmission member 63 is arranged between the two hooks 61 to drive the two hooks 61 to rotate synchronously. The hook transmission member 63 deviates from the rotation axis of the hook 61. A compression spring 64 is arranged between the hook 61 or the hook driving member 62 and the base 1. The compression spring 64 is used to provide the hook driving member 62 or the hook 61 with a force to reset the hook 61 and hook the block 51. By providing a transmission part between the two hooks 61 of the hook 61 mechanism, the two hooks 61 can move synchronously, and a compression spring 64 is used instead of a torsion spring. The stable force value of the compression spring 64 can ensure that the reset force of the two hooks 61 is consistent, and the existence of traditional parts can also ensure that the force of the two compression springs 64 is evenly transmitted to the two hooks 61, that is, the feel of pressing the drive hook 61 to rotate and disengage the block 51 is consistent, ensuring a stable and consistent cover opening experience; and the compression spring 64 only needs to be connected between the hook 61 and the base 1 to complete the installation, which is convenient for production and assembly and improves production efficiency.

[0032] See also Figures 1 to 6Preferably, an abutment block 11 is provided on the base 1 at a position opposite to each hook 61, and one end of the compression spring 64 is connected to the side of the abutment block 11 close to the hook 61, and the other end of the compression spring 64 abuts against the corresponding hook 61. Since one end of the compression spring 64 abuts against the hook 61 and the other end abuts against the abutment block 11 on the base 1, there is no need to axially limit the rotation axis with the hook 61, so the installation accuracy requirement can be reduced, the dimensional accuracy requirement can be reduced, which helps to improve production efficiency and reduce production costs.

[0033] See also Figures 1 to 6 Preferably, the hook transmission member 63 includes a transmission rod, and the two ends of the transmission rod are respectively fixedly connected to one of the hooks 61; the hook driving member 62 includes a button, and the button is telescopically installed on one side end surface of the base 1, and one end of the button abuts against the transmission rod, and by pressing the button, the transmission rod drives the hook 61 to rotate and disengage from the block 51. The two hooks 61 are fixedly connected by the transmission rod, so that the two hooks 61 can rotate synchronously, and the feel of pressing the hook 61 or the transmission rod can be consistent.

[0034] See also Figures 1 to 6 Preferably, the hook includes a hook body 611 rotatably mounted in the mounting cavity of the base 1, the hook body 611 is composed of a transmission part 612 and a clamping part 613, a rotation hole 614 is provided between the transmission part 612 and the clamping part 613, the rotation hole 614 is rotatably connected to the mounting cavity of the base 1 through a first pin shaft, and a clamping groove 615 adapted to the clamping block 51 is provided at the bottom of the clamping part 613. Preferably, a special-shaped hole is provided on the transmission part 612, and special-shaped shafts adapted to the special-shaped hole are provided at both ends of the transmission rod. It is convenient for the hook 61 to be assembled and connected with the transmission rod and the base 1.

[0035] See also Figures 1 to 7 Preferably, a button hole 15 is provided on the front face of the base 1, and the button is installed in the button hole 15. The end of the button in contact with the transmission rod is provided with an outwardly convex first limiting convex ring. The hole diameter of the end of the button hole 15 facing the transmission rod is smaller than the size of the end of the button hole away from the transmission rod, and the diameter of the first limiting convex ring is larger than the hole diameter of the end of the button hole 15 facing the transmission rod. The button hole 15 provided on the base 1 is convenient for installing the button. The first limiting convex ring on the button and the reduced diameter of the end of the button hole 15 facing the transmission rod can ensure that the button will not fall out of the base 1.

[0036] See also Figure 1 , Figures 7 to 10Preferably, the base 1 is provided with a paper feed channel 14 connected to the rubber roller 3, and a plurality of guide ribs 7 are arranged at intervals on the bottom surface of the paper feed channel 14. A guide portion 71 is arranged on the side of the guide rib 7 close to the rubber roller 3, and an upward curved surface is arranged on the guide portion 71. The guide rib 7 is arranged on the surface of the paper feed channel 14 on the base 1 to reduce the contact area between the paper 2 and the paper feed channel 14, which can reduce the resistance during paper feeding and make the paper feeding process smoother; the guide portion 71 on the guide rib 7 is set as a curved surface so that the paper 2 can cut into the rubber roller 3 along the tangent direction, so that the paper 2 can be quickly absorbed by the rubber roller 3

[0037] See also Figure 1 , Figures 7 to 10 Preferably, a plurality of guide ribs 7 are arranged at intervals; the width of the guide ribs 7 gradually decreases from bottom to top; a transition portion 72 is provided on the side of the guide rib 7 away from the rubber roller 3, and the transition portion 72 is inclined downward from the side close to the rubber roller 3 to the side away from the rubber roller 3, and the height of the end of the transition portion 72 away from the rubber roller 3 is flush with the height of the upper surface of the base 1; the curved surface of the guide portion 71 is connected with a lower curved surface on the side close to the rubber roller 3, and the upper surface of the lower curved surface close to the rubber roller 3 is tangent to the surface parallel to the upper surface of the base 1. Arranging a plurality of guide ribs 7 at intervals facilitates the dispersion of force to ensure the smooth movement of the paper 2, avoids warping in the vertical direction of the paper feeding direction, and helps to feed the paper smoothly. Designing the guide rib 7 to be a structure with a small top and a large bottom can also help reduce the contact area with the paper 2, and help the rubber roller 3 to absorb the paper more smoothly. The transition part 72 is set as an inclined surface so that the end of the inclined surface away from the rubber roller 3 is flush with the upper surface of the base 1, so that the paper 2 can smoothly enter the guide rib 7 when pushed in. The guide tail end is curved downward to prevent the paper 2 from being unable to contact the rubber roller 3 due to the excessive curvature of the tail end of the guide part 71, or being blocked by the upward curved surface of the guide part 71 and unable to move forward.

[0038] See also Figure 1 , Figure 3 , Figures 11 to 13 Preferably, the base 1 is provided with a paper feed channel 14 connected to the rubber roller 3, and the paper feed channel 14 is provided with a paper limiting mechanism 8, and the paper limiting mechanism 8 includes two paper limiting pieces 81 and a paper limiting driving member, the two paper limiting pieces 81 are symmetrically installed on both sides of the paper feed channel 14, and the paper limiting driving member is installed in the base 1, and the two paper limiting pieces 81 are transmission-connected with the paper limiting driving member to drive the two paper limiting pieces 81 to approach or move away from each other. The two paper limiting pieces 81 of the paper limiting mechanism 8 can be driven by the paper limiting driving member to approach or move away from each other in the paper feed channel 14 to meet the paper feeding requirements of paper 2 of different sizes.

[0039] See also Figure 1, Figure 3 , Figures 11 to 13 Preferably, the paper feed channel 14 is arranged on the surface of the base 1 facing the upper cover 5, and the driving member of the paper limiter 81 includes a driving gear 82 and a driving rack 83. The driving gear 82 is rotatably mounted on the side of the base 1 away from the paper feed channel 14, and two driving racks 83 are relatively mounted on both sides of the driving gear 82, respectively meshing with the driving gear 82, and the two driving racks 83 move in opposite directions. The two driving racks 83 are respectively connected to one paper limiter 81, and the bottom surface of the paper feed channel 14 is symmetrically provided with a clearance groove 13 for the paper limiter 81 to connect and move with the driving rack 83. The two driving racks 83 move in opposite directions, so that the limiting plate can place the paper 2 in the center.

[0040] See also Figure 1 , Figure 3 , Figures 11 to 13 Preferably, a limiting rib 86 is provided on the back of the base 1 on the moving track of the driving rack 83, and a second limiting convex portion is provided on the end of the driving gear 82 away from the base 1, and the limiting rib 86 cooperates with the second limiting convex portion to prevent the driving rack 83 from escaping from the base 1, and a guide groove 85 and / or a guide rib 84 are provided on the driving rack 83, and a guide rib 84 and / or a guide groove 85 are provided on the back of the base 1, and the guide groove 85 cooperates with the corresponding guide rib 84 for guidance. It plays a guiding and limiting role in the movement of the rack. The lower cover of the base 1 is connected to the lower cover. It can be that one driving rack 83 is provided with a guide groove 85, and the base 1 corresponding to the driving rack 83 is provided with a guide rib 84; another driving rack 83 is provided with a guide rib 84, and the base 1 corresponding to the driving rack 83 is provided with a guide groove 85.

[0041] See also Figures 1 to 3 Preferably, a sensor 9 is provided in the paper feeding channel 14 for detecting whether paper is fed in. A battery 10 is provided in the base 1 for supplying power to the motor group 4 , the print head 12 , and the sensor 9 .

[0042] The utility model has the following working principle:

[0043] When sucking paper, the paper 2 is placed on the paper feeding channel 14 of the base 1, and the paper 2 is pushed toward the rubber roller 3. The paper 2 moves onto the guide rib 7 through the transition portion 72 of the guide rib 7, and the paper 2 continues to move to the guide portion 71. The paper 2 passes through the curved surface of the guide portion 71 of the guide rib 7, so that the end of the paper 2 facing the rubber roller 3 is warped, and the guide portion 71 has an inverse curved surface at the end close to the rubber roller 3 to prevent the guide portion 71 from blocking the paper feeding; after the paper 2 is warped, it continues to move and contacts the rubber roller 3 from the tangential direction of the rubber roller 3, and the rubber roller 3 can absorb the paper 2 and move from the upper side of the rubber roller 3 to the lower side of the rubber roller 3, and due to the existence of the guide portion 71 of the guide rib 7, the paper 2 will not directly enter from the lower side of the rubber roller 3 (here the moving direction of the rubber roller 3 is opposite to the feeding direction of the paper 2, if the paper 2 contacts the rubber roller 3 here, there will be a directional pushing action to cause paper jam). By providing a plurality of guide ribs 7 on the upper surface of the base 1 in front of the paper feeding direction of the rubber roller 3, the lower surface of the paper 2 only contacts with a few ribs on the surface of the base 1, which can reduce the contact area and achieve the effect of reducing the resistance during paper feeding; and the guide rib 7 is provided with an upward curved guide portion 71 on the side close to the rubber roller 3, so that the head end of the paper 2 can enter the contact rubber roller 3 along the tangent direction of the rubber roller 3. If there is no curved surface, the paper 2 is easy to hit the rubber roller 3 when feeding, or the paper is fed from the other side of the rubber roller 3 and pushed back by the rubber roller 3, which will cause paper jam. The curved guide portion 71 can make the action of the rubber roller 3 sucking paper smoother. When it is necessary to adjust the spacing of the paper limiter 81 to adapt to the size of the paper 2, the driving gear 82 is rotated to drive the driving rack 83 meshed with it to move, so as to achieve the purpose of adjusting the spacing between the two paper limiters 81. When maintenance or paper replacement is required, the button is pressed to move the button toward the base 1, and the button pushes the transmission rod to move, and then the transmission rod drives the hook 61 to rotate around its rotation axis and disengage from the block 51, and the upper cover 5 can be opened; at this time, the hook 61 compresses the compression spring 64, and after releasing the button, the button will drive the hook 61 to rotate in the opposite direction and reset, and then drive the transmission rod to move in the opposite direction and reset, and the transmission rod pushes the button to reset to the initial position. When the upper cover 5 is closed, the block 51 of the upper cover 5 will press against the hook 61, causing the hook 61 to deflect and displace the block 51 into the slot 615 of the hook 61, and then the compression spring 64 drives the hook 61 to deflect in the opposite direction and hook the block 51.

[0044] Several points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, and can be mechanical or electrical connections, or internal connectivity between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may change.

[0045] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the usual design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0046] Finally, the above is only a preferred implementation of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

[0047] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications without departing from the principle of the utility model should also be regarded as within the protection scope of the utility model.

Claims

1. A novel printer, comprising a base and an upper cover assembly, wherein the base is provided with a rubber roller, the upper cover assembly comprises an upper cover and a print head provided on the upper cover, and a motor group for driving the rubber roller to suck paper, the upper cover capable of rotating relative to the base is installed on the base, and is characterized in that: A cover opening hook mechanism is installed on the base; the cover opening hook mechanism includes two hooks respectively installed on both sides of the installation cavity of the base, and the hooks can rotate relative to the base; two blocks cooperating with the hooks are provided on the upper cover, and the cover opening hook mechanism also includes a hook driving member, and a transmission member for driving the two hooks to rotate synchronously is provided between the two hooks, and the hook transmission member deviates from the rotation axis of the hook, and a compression spring is provided between the hook or the hook driving member and the base, and the compression spring is used to provide the hook driving member or the hook with a force to reset the hook and hook the block.

2. A novel printer according to claim 1, characterized in that: A contact block is provided on the base at a position opposite to each of the hooks, one end of the compression spring is connected to one side of the contact block close to the hook, and the other end of the compression spring is against the corresponding hook.

3. A novel printer according to claim 2, characterized in that: The hook transmission member includes a transmission rod, and both ends of the transmission rod are fixedly connected to one of the hooks respectively; the hook driving member includes a button, and the button is telescopically installed on one side end surface of the base, and one end of the button is against the transmission rod. By pressing the button, the transmission rod is driven to drive the hook to rotate and disengage from the block.

4. A novel printer according to claim 3, characterized in that: The hook includes a hook body rotatably installed in the base mounting cavity, the hook body is composed of a transmission part and a clamping part, a rotation hole is provided between the transmission part and the clamping part, the rotation hole and the base mounting cavity are rotationally connected through a first pin shaft, and a clamping groove adapted to the clamping block is provided at the bottom of the clamping part.

5. A novel printer according to claim 3, characterized in that: A button hole is provided on the front end surface of the base, and the button is installed in the button hole. An end of the button in contact with the transmission rod is provided with an outwardly protruding first limiting ring. The aperture of the button hole at one end facing the transmission rod is smaller than the size of the button hole at one end away from the transmission rod, and the diameter of the first limiting ring is larger than the aperture of the button hole at one end facing the transmission rod.

6. A novel printer according to claim 1, characterized in that: The base is provided with a paper feed channel connected to the rubber roller, a plurality of guide ribs are arranged at intervals on the bottom surface of the paper feed channel, a guide portion is provided on the side of the guide rib close to the rubber roller, and an upward curved surface is provided on the guide portion.

7. A novel printer according to claim 6, characterized in that: A plurality of guide ribs are arranged at intervals; the width of the guide ribs gradually decreases from bottom to top; a transition portion is provided on the side of the guide rib away from the rubber roller, the transition portion is inclined downward from the side close to the rubber roller to the side away from the rubber roller, and the height of one end of the transition portion away from the rubber roller is flush with the height of the upper surface of the base; the upper curved surface of the guide portion is connected to a lower curved surface on the side close to the rubber roller, and the upper surface of one end of the lower curved surface close to the rubber roller is tangent to a surface parallel to the upper surface of the base.

8. A novel printer according to claim 1, characterized in that: The base is provided with a paper feeding channel connected to the rubber roller, and the paper feeding channel is provided with a paper limiting mechanism, and the paper limiting mechanism includes two paper limiting sheets and a paper limiting driving component, the two paper limiting sheets are symmetrically installed on both sides of the paper feeding channel, and the paper limiting driving component is installed in the base, and the two paper limiting sheets are transmission-connected with the paper limiting driving component for driving the two paper limiting sheets to approach or move away from each other.

9. A novel printer according to claim 8, characterized in that: The paper feed channel is arranged on the surface of the base facing the upper cover, and the paper limiting piece driving component includes a driving gear and a driving rack. The driving gear is rotatably installed on the side of the base away from the paper feed channel, and two driving racks are relatively installed on both sides of the driving gear and are respectively engaged with the driving gear. The two driving racks move in opposite directions, and the two driving racks are respectively connected to one of the paper limiting pieces. A clearance groove for connecting and moving the paper limiting piece with the driving rack is symmetrically provided on the bottom surface of the paper feed channel.

10. A novel printer according to claim 9, characterized in that: The back side of the base is provided with a limiting rib on the moving track of the driving rack, the end of the driving gear away from the base is provided with a second limiting protrusion, the limiting rib and the second limiting protrusion cooperate to prevent the driving rack from falling out, the driving rack is provided with a guide groove and / or a guide rib, the back side of the base is provided with a guide rib and / or a guide groove, the guide groove cooperates with the corresponding guide rib for guidance.

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