A paper jam-proof printer

Abstract

The present invention relates to an anti-paper jam printer, comprising a main body and an upper cover body, wherein the upper cover body is pivotally connected to the main body and can rotate around a pivot axis to correspondingly open or close the printer; after the main body and the upper cover body are covered, a paper bin for storing printing paper, a paper feeding channel for printing paper and a printing paper output port are sequentially formed, and a printing unit is arranged on the paper feeding channel, the main body and the upper cover body are triangular in the first direction, the paper bin is close to the pivot axis end, and the printer is inclined along the outer contour of the paper bin toward the printing unit, and a control circuit board, a reduction gear set and a motor for controlling or driving the printing unit are arranged. Due to the adoption of the technical solution of the present invention, the length of the paper feeding channel can be effectively reduced, thereby effectively reducing the poor printing quality caused by the excessively long paper feeding channel during paper jam or printing transmission.

Description

Technical Field

[0001] The invention relates to the technical field of thermal printers, and in particular to an anti-paper jam printer. Background Art

[0002] In the past, in the printing module of the thermal printer, the printing roller rotates while the recording paper is clamped by the printing roller and the thermal head, thereby conveying the recording paper while heating the printing surface of the recording paper by the thermal head, so that the printing surface is colored for printing. For example, the patent printing device, the patent publication number is CN103660622B, and the main technology disclosed is: a printing device, characterized in that it has: a printing head that prints on one side of a long strip of printed medium, and a plurality of oblique lines with the same inclination angle are formed at a certain interval on the other side of the printed medium; a conveying roller that conveys the printed medium; a sensor that is arranged before the conveying roller in the conveying path of the printed medium and is used to detect the oblique lines; and a control unit that controls the printing head so as to detect the deviation of the conveying direction of the printed medium according to the interval of the oblique lines relative to the conveying direction of the printed medium detected by the sensor, and according to the deviation, the rotation pressure of the conveying roller is controlled to correct the conveying direction, so that the printing position of the printed medium is changed for printing.

[0003] Combined with the above-mentioned patent disclosure, it can be seen that during the printing process, the printing paper needs to be transported a long distance after coming out of the paper bin to reach the print head position for printing, and its paper feeding path is still bent, which is not conducive to the transmission of the printing paper. If the transmission distance is too long, the printing paper will be jammed during transmission, or during transmission, because the printing paper is flexible, the friction on the paper feeding path will cause the printing paper to be fast or slow at the print head, thereby affecting the printing quality. Summary of the invention

[0004] The invention discloses a paper jam-proof printer, which is designed to solve the problem that the printing quality of the printer is affected due to an overly long paper path.

[0005] The present invention adopts the following scheme:

[0006] A paper jam-proof printer comprises a main body and an upper cover body, wherein the upper cover body is pivotally connected to the main body and can rotate around a pivot axis to correspondingly open or close the printer; when the main body and the upper cover body are covered, a paper bin for storing printing paper, a paper feeding channel for printing paper and a printing paper output port are sequentially formed, and a printing unit is provided on the paper feeding channel; the main body and the upper cover body are covered to form a prism body with at least four prisms, the output port and the pivot axis are respectively located on two non-adjacent prisms, and the joint surface thereof is located between two non-adjacent prisms and cuts the printer along the prism direction; the main body and the upper cover body are triangular in the first direction, and the paper bin is close to the end of the pivot axis; the printer is inclined along the outer contour of the paper bin toward the printing roller and is provided with a control circuit board, a reduction gear set and a motor for controlling or driving the printing unit to work.

[0007] As a further improvement, the printing unit includes a thermal head and a printing roller that are arranged opposite to each other, one of which is arranged on the upper cover body, and the other is arranged on the main body.

[0008] As a further improvement, an upper cavity forming the paper bin is provided on one side of the upper cover body close to the pivot axis, a control circuit board is provided on the back of the upper cavity, and the control circuit board is inclined along the top of the upper cavity toward the output port.

[0009] As a further improvement, the main body includes a base and a lower shell, and a lower cavity forming the paper bin is provided on one side of the base close to the pivot axis. A battery, a motor and a reduction gear group are arranged in sequence on the back side of the lower cavity from high to far away from the pivot axis, and the reduction gear group is connected to the print roller.

[0010] As a further improvement, an adjustment mechanism for fixing printing papers of different widths is provided in the lower cavity of the main body.

[0011] As a further improvement, the adjustment mechanism includes a moving rod and a blocking piece arranged on the moving rod, the blocking piece can move along the moving rod, and the moving rod is parallel to the pivot axis.

[0012] As a further improvement, the length of the paper feeding channel is less than 3.0 cm.

[0013] As a further improvement, a detection device for detecting printing paper information is provided on the paper feeding channel.

[0014] As a further improvement, the detection device includes a transmitting unit and a receiving unit, one of which is arranged on the main body and the other is arranged on the upper cover.

[0015] As a further improvement, a cutter for cutting the printing paper is provided at the output port.

[0016] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0017] 1. The present invention arranges the printing paper outlet and the pivot axis at two ends of the same diagonal line, thereby leaving more space for the paper bin, so that more printing papers can be accommodated at one time.

[0018] 2. The present invention provides a motor and a reduction gear set for driving the print roller to rotate, which are obliquely arranged between the print roller and the top or bottom of the paper bin to reduce the length of the paper feeding channel, thereby improving the printing quality of the printer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the first direction projection of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the upper cover body of the present invention after flipping over;

[0023] Figure 4 It is a schematic diagram of the exploded structure of the upper cover body of the present invention;

[0024] Figure 5 It is a schematic diagram of the exploded structure of the upper bracket of the present invention;

[0025] Figure 6 is a schematic structural diagram of the upper bracket of the present invention from a first viewing angle;

[0026] Figure 7 is a schematic diagram of the exploded structure of the upper bracket of the present invention from a first viewing angle;

[0027] Figure 8 It is a schematic diagram of the decomposed structure of the main body of the present invention;

[0028] Fig. 9 The present invention Figure 2 Schematic cross-sectional view of AA in the figure;

[0029] Fig.10 It is a schematic diagram of the structure of the main body of the present invention from a first perspective;

[0030] Fig.11 The present invention Fig.10A schematic cross-sectional view of the middle BB when the adjustment mechanism is locked;

[0031] Fig.12 The present invention Fig.10 A cross-sectional view of the middle BB when the adjustment mechanism is unlocked;

[0032] Icons: 1. Main body; 2. Upper cover; 3. Output port; 4. Button; 5. Paper bin; 6. Adjustment mechanism; 7. Thermal head; 8. Print roller; 9. Cutter; 11. Base; 12. Lower shell; 13. V-shaped decorative piece; 21. Upper bracket; 22. Upper shell; 23. Decorative piece; 51. Upper cavity; 52. Lower cavity; 61. Moving rod; 62. Baffle; 63. Control rod; 71. Support part; 72. Elastic part; 91. Fixing hole; 92. Square hole; 100. Pivot shaft; 101. Transmitting unit; 102. Receiving unit; 103. Connecting shaft; 111. Battery; 112. Motor; 113, reduction gear set; 114, hinged part; 200, diagonal line; 211, isolation plate; 212, reinforcement strip; 213, control circuit board; 214, hinged tube; 215, accommodating chamber; 216, wire groove; 521, sliding groove; 522, fixing block; 621, mounting groove; 622, limiting block; 623, groove; 624, inner wall; 625 reinforcement part; 631, protrusion; 1141, clearance hole; 2111, fixing column; 2112, positioning block; 2121, protrusion; 2141, wire hole; 2151, limiting groove; 2152, stop strip; 2153, mounting column. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] Example

[0039] The first direction in the present invention is the X direction and the −X direction in the drawings, the second direction is the Y direction and the −Y direction in the drawings, and the third direction is the Z direction and the −Z direction in the drawings.

[0040] Now combined Figures 1 to 12 The structure and function of the solution of this application are described in detail.

[0041] Combination Figures 1 to 3 This embodiment provides a printer, including a main body 1 and an upper cover 2, the upper cover 2 is pivotally connected to the main body 1 and can rotate around a pivot axis 100 to open or close the printer accordingly, the main body 1 and the upper cover 2 are combined to form a paper bin 5 for storing printing paper and a printing paper output port 3, the paper feeding channel is provided with a printing unit, and the printing unit includes a printing roller 8 and a thermal head 7 arranged oppositely. Figure 1 and 2 As shown, the main body 1 and the upper cover 2 are combined to form a prism with four prisms. The joint surface formed by the main body 1 and the upper cover 2 is located between two opposite prisms and cuts the printer along the prism direction. The printer also includes a control button 4, and the control button 4 and the pivot shaft 100 are simultaneously arranged on one of the two prisms, and the other prism is provided with a printing paper outlet 3. The pivot shaft 100 passes through the control button 4. The printer is provided with a pivot shaft 100, a paper bin 5 for accommodating printing paper, a paper feeding channel, a printing area and a printing paper outlet 3 formed by the opposite arrangement of the thermal head 7 and the printing roller 8 along the joint surface. In this embodiment, a quadrangular prism is preferred, and the concept of the present invention may also be applicable to other prisms, such as a pentagonal prism, and its joint surface passes through two non-adjacent prisms.

[0042] like Figure 2 As shown, the main body 1 and the upper cover 2 are triangular in the first direction. One of the preferred schemes of this embodiment is a right-angled triangular shape, and the right-angled side has a circular chamfer to prevent sharp edges from being easily scratched. After the main body 1 and the upper cover 2 are covered, the projection in the first direction is approximately square. The above two prisms are connected in the first direction to form a diagonal 200. The pivot axis 100 and the printing paper output port 3 are respectively located at the two ends of the diagonal 200, that is, on the above two prisms. The printer described in the present invention is a solid body as a whole, or approximately a cube. In this embodiment, the printer is in a cubic shape as a whole. Most of the joint surfaces of the main body 1 and the upper cover 2 after covering coincide with the diagonal 200, and the paper bin 5 is close to the pivot axis 100, so that the front space of the printer can be effectively used to arrange other functional components. Since the printer adopts the above shape and structural layout, the volume of the paper bin can be increased to 40%-70% of the volume of the printer. In this way, the amount of printing paper placed in the paper bin can be maximized.

[0043] Reference Figure 4The upper cover 2 includes an upper bracket 21, an upper shell 22 for wrapping the upper bracket 21, and a decorative piece 23 for decorating the upper shell 22. The upper bracket 21 is shaped like a bucket, and the front end is provided with a thermal head 7, and the projection of the middle end in the first direction is semicircular, so as to serve as an upper cavity 51 for placing printing paper to match the installation of a roll of printing paper, and the projection of the rear end in the first direction is cylindrical, so as to serve as a hinged tube 214 connecting the printer body 1 and the upper cover 2. The projection of the upper shell 22 in the first direction is approximately triangular, and the top is a right angle with a circular chamfer. The upper bracket 21 can be completely accommodated in the upper shell 22. A square opening is provided at the front end of the upper shell 22, which is a printing paper output port 3, and the rear end of the upper shell 22 is a circular chamfer to match the hinged tube 214 of the upper bracket 21, and the upper cover 2 can have a sufficient opening angle to facilitate the installation of the roll of printing paper without interfering with the main body 1. The projection of the decorative part 23 in the first direction is V-shaped to match the two right-angled sides of the upper shell 22. The decorative part 23 can be selected in different colors according to different preferences to make the appearance of the printer more beautiful, and different materials such as metal film materials can be selected to increase the strength of the printer to prevent the printer from being easily crushed due to its small size.

[0044] Reference Figure 1 and Figure 3 , the projection of the main body 1 and the upper cover 2 in the first direction after being covered is approximately square, the pivot axis 100 is arranged at the center of the hinge tube 214 at the end of the approximately square diagonal 200 and extends along the first direction, the printer is also provided with a control button 4, the control button 4 is arranged on the side of the printer, the pivot axis 100 is perpendicular to the side and passes through the control button 4, so that the length of the electrical connection path between the control button 4 and the upper cover 2 or the main body 1 and the wire material can be reduced, and the assembly is easier. The output port 3 of the printer is arranged on the other end of the diagonal 200 and is arranged parallel to the pivot axis 100, so that the output port 3 of the printer is divided into upper and lower parts when the main body 1 and the upper cover 2 are opened to facilitate the installation of the printing paper, and the front end of the printing paper is stretched to the printing paper output port 3.

[0045] Reference Figure 4 and Figure 5When the upper bracket 21 is placed in the upper shell 22, since the upper cavity 51 is arranged at the rear end of the upper bracket 21, after the upper bracket 21 is matched with the upper shell 22, the front end thereof has a certain space, which can be used to place other components, so as to reduce the size of the printer and facilitate carrying. On one side of the upper cover 2 near the pivot axis 100, an upper cavity 51 forming a paper bin 5 is provided, i.e., the middle half-circular arc of the upper bracket 21. A control circuit board 213 is provided on the back of the upper cavity 51. The control circuit board is used to control the printing of the thermal head. On the back of the upper cavity 51, the upper bracket 21 is provided with support columns to fix the control circuit board 213. Preferably, there are four support columns, which respectively fix the four sides of the control circuit board 213. The control circuit board 213 is arranged parallel to the surface of the upper shell 22 at an angle inclined downward on the arc surface. The support column at the top of the arc is relatively long, and the support column at the bottom of the arc is relatively short, so that the control circuit board 213 is inclined along the top of the upper cavity 51 toward the output port 3 to compactly and reasonably utilize the internal space of the upper cover, so as to achieve the purpose of structural optimization and compact size. The control circuit board 213 is electrically connected to the control button 4, and the control button 4 is used to control the printer to turn on or off the control circuit board 213.

[0046] Reference Figure 5 and Figure 6 , connecting arms extending forward on both sides of the front end of the upper bracket 21, and an isolation plate 211 is provided on the connecting arm, so that the isolation plate 211 and the upper bracket 21 form a receiving cavity 215 for installing the thermal head 7 on the inner side, and a cutter 9 is fixed on the outer side of the isolation plate 211 to cut and separate the printed printing paper from the printer. The isolation plate 211 separates the thermal head 7 and the cutter 9 to prevent the static electricity on the cutter 9 from affecting the printing quality of the thermal head 7 on the printing paper. It can be understood that the cutter 9 is basically made of metal materials, and the front end of the cutter 9 is exposed to the air for a long time, and static electricity is easily accumulated during use. If there is no isolation plate 211 between the cutter 9 and the thermal head 7, it is easy for the cutter 9 to generate static electricity to affect the printing quality of the thermal head 7 on the printing paper. Installing the thermal head 7 in the receiving cavity 215 can reduce the static electricity on the cutter 9 from being transmitted to the thermal head 7, thereby improving the printing quality. In this embodiment, a preferred solution is that the isolation plate 211 and the upper bracket 21 are integrally formed of a resin material, preferably, an insulating resin material.

[0047] A positioning block 2112 and a fixing column 2111 are provided on the side of the upper shell 22 on the isolation plate 211. A square hole 92 matching the positioning block 2112 is provided on the cutter 9 to limit the left and right movement of the cutter 9 when cutting the printing paper, which is convenient for use. The cutter 9 is fixed on the isolation plate 211 by the fixing column 2111 in a hot-melt manner. The interior of the printer is generally made of plastic injection molding, and the isolation plate 211 is also made of plastic injection molding. The thickness of the cutter 9 is relatively thin. Several fixing holes 91 are opened on the cutter 9, and the fixing columns 2111 are melted on the fixing holes 91 by hot-melt, so that the cutter 9 is fixed on the isolation plate 211, so that the cutter 9 is integrated with the isolation plate 211 to prevent the vibration of the thermal head 7 during the printing process from causing the cutter 9 to fall off. Of course, other fixing methods such as screws can also be used. The isolation plate 211 is close to the output port 3, so that the sawtooth end on the cutter 9 can protrude outside the output port 3 to cut and separate the printed printing paper. A stop bar 2152 is provided on the side of the isolation plate 211 facing the accommodating chamber 215 of the thermal head 7 to prevent the printing paper from entering the accommodating chamber 215 when it is retreated. Specifically, since the thermal head 7 will vibrate up and down during the printing process, the front end of the thermal head 7 installed in the accommodating chamber 215 will not abut the isolation plate 211, and there will be a gap between the isolation plate 211, so that after the printing paper is printed and cut and separated by the cutter 9, the front end of the printing paper will be flush with the printing paper output port 3. Since the printing paper is pulled upward when it is cut, the front end of the printing paper will roll up during the retreat process, which makes it easy for the front end of the printing paper to enter the accommodating chamber 215 from the gap. The stop bar 2152 is provided on the isolation plate 211 to prevent the printing paper from rolling into the accommodating chamber 215 after printing again, thereby preventing paper jams. Preferably, there are at least 4 stop bars 2152, and the stop bars 2152 are distributed at intervals, so that when the printing paper retreats, there will be multiple support points, which can greatly reduce the occurrence of paper jams caused by the printing paper entering the accommodating chamber 215 when retreating.

[0048] Reference Figure 5 and Figure 7The printing paper receiving chamber 215 is provided with a limit groove 2151, and the two ends of the thermal head 7 are provided with a support part 71 matching the limit groove 2151. The cooperation between the limit groove 2151 and the support part 71 limits the forward and backward movement of the thermal head 7. An elastic member 72 is provided between the isolation plate 211 and the thermal head 7, and a mounting column 2153 is provided on the isolation plate 211. The elastic member 72 is installed in the mounting column 2153 to provide downward pressure to the thermal head 7, so that the thermal head 7 and the printing roller 8 clamp the printing paper to print pictures. A reinforcing strip 212 is provided in the receiving chamber 215 to increase the strength of the front end of the upper bracket 21. Preferably, the reinforcing strip 212 is made of hard metal to prevent the front end of the upper bracket 21 from being deformed due to the heating of the thermal head 7, resulting in a change in the height of the paper path and affecting the output of the printing paper. The reinforcing strip 212 is also provided with a protrusion 2121 that abuts against the rear end of the thermal head 7, so that the thermal head 7 can maintain balance in the abutment between the elastic member 72 and the protrusion 2121, thereby preventing the thermal head 7 from tilting forward and backward.

[0049] Reference Figure 8 The main body 1 includes a base 11 and a lower shell 12, which are similar in shape to the upper bracket 21 and the upper shell 22, and are triangular in the first direction. A V-shaped decorative piece 13 is also provided on the outer side of the lower shell 12. A lower cavity 52 of the paper bin 5 is provided on the side of the base 11 close to the pivot axis 100. The back of the lower cavity 52 is provided with a battery 111, a motor 112 and a reduction gear set 113 in sequence from high to far from the pivot axis 100. The inclined setting can reduce the length of the printer extending forward, which is conducive to reducing the size of the printer, making the printer structure more compact and more convenient to carry. The printing roller 8 is fixed at a position close to the output port 3 of the base 11. The printing roller 8 is connected to the reduction gear set 113. The motor 112 drives the reduction gear set 113 to rotate, thereby driving the rotation of the printing roller 8. The rotation of the printing roller 8 and the clamping printing of the thermal head 7 are used to transmit the printing paper forward. Two hinged parts 114 are arranged on the base 11, and the hinged part 114 and the hinged tube 214 of the upper bracket 21 are coaxially arranged with the pivot axis 100, and are rotatably connected together through the connecting shaft 103. The hinged tube 214 is connected to the hinged parts 114 on both sides through the connecting shaft 103 so that the main body 1 and the upper cover body 2 can rotate along the pivot axis 100. The connecting shaft 103 is a hollow shaft, and the conductive wire can pass through the middle thereof.

[0050] Reference Figure 8 and Fig. 9The hinged tube 214, the hinged part 114 and the connecting shaft 103 are all hollow, so that the wires can pass through the hinged tube 214, the hinged part 114 and the connecting shaft 103. In order to make the main body 1 and the cover body have a threading path without exposing the wires to increase the appearance, the hinged part 114 of the base 11 has a clearance hole 1141 for the wires to pass through and connect to the motor 112. The clearance hole 1141 is arranged on the other side opposite to the control button 4, which can more reasonably arrange and utilize the limited internal space of the printer. A wire hole 2141 for the wires to pass through is provided in the middle of the hinged tube 214, so that the control circuit board 213 of the upper cover body 2 can be electrically connected to the control button 4 to control the printer.

[0051] Specifically, the wires connected to the motor 112 on the base 11 are electrically connected to the control circuit board 213 through the clearance hole 1141 to control the opening of the printer, and the wires of the control circuit board 213 of the upper cover body 2 are connected to the control button 4 through the wire hole 2141 and the connecting shaft 103, thereby transmitting the control information to the control circuit board 213 to start printing.

[0052] Reference Figure 3 , Figure 6 and Fig.10 After the main body 1 and the upper cover body 2 are covered, a paper bin 5 for storing printing paper, a paper feeding path for printing paper, a printing area and a printing paper output port 3 formed by the opposite arrangement of the thermal head 7 and the printing roller 8 are formed in sequence. The paper feeding path is directly formed by the upper surface of the main body 1 and the lower surface of the upper cover body 2, and is used to connect the paper bin 5 and the printing area. By tilting the circuit control board in the upper cover body 2 and the battery 111, the motor 112 and the reduction gear group 113 in the main body 1, the length of the paper feeding path can be reduced. Generally, the length of the paper feeding path can be less than 3.0 cm, thereby reducing the problems of paper jam, paper tilt or fast and slow transmission speed that may occur due to the excessively long paper feeding path, thereby improving the printing quality.

[0053] A detection device for detecting printing paper information is provided on the paper feeding channel, and the detection device includes a transmitting unit 101 and a receiving unit 102, one of which is provided on the main body 1, and the other is provided on the upper cover 2. When the transmitting unit 101 detects that the printing paper passes through the paper feeding channel, it transmits the information to the receiving unit 102, and the receiving unit 102 provides the information to the control circuit board 213 after receiving the information.

[0054] Reference Fig.10The lower cavity 52 is provided with a paper width adjustment mechanism 6, a moving rod 61 and a sliding groove 521. The paper width adjustment mechanism 6 is provided on the moving rod 61 and can move along the moving rod 61 and the sliding groove 521 to adapt to printing papers of different paper widths. The moving rod 61 crosses the entire width of the lower cavity 52 and is fixed on both sides of the lower cavity 52. ​​The lower end of the sliding groove 521 is an arc-shaped curved surface, and the upper end is a straight plane, so that the lower end can slide better when the paper width adjustment mechanism 6 is unlocked, and the upper end can be better restricted when the paper width adjustment mechanism 6 is locked.

[0055] The adjustment mechanism 6 includes a baffle 62 and a control rod 63. The baffle 62 is arranged on the moving rod 61 and can move left and right along the moving rod 61. Specifically, a through hole for the moving rod 61 to pass through is opened at the front end of the baffle 62, so that the baffle 62 is sleeved on the moving rod 61, and a shape consistent with the shape of the sliding groove 521 is provided at the rear end of the baffle 62. When in use, the rear end of the baffle 62 is stuck in the sliding groove 521 and can move along the first direction. The lower end of the baffle 62 has an arc-shaped portion that matches the lower cavity 52 so that the baffle 62 is tightly attached to the lower cavity 52. ​​A control rod 63 mounting groove 621 is provided on the baffle 62. The control rod 63 is arranged in the mounting groove 621 and is pivotally connected to the moving rod 61. The baffle 62 is locked by the control rod 63 to be fixed on the moving rod 61. Specifically, refer to Fig.11 and Fig.12 A stopper 622 is provided in the mounting groove 621. When the control rod 63 swings downward, the control rod 63 contacts the inner wall 624 of the mounting groove 621 in an interference fit manner to fix the stopper 62 on the moving rod 61. At the same time, the rear end of the stopper 62 contacts the middle of the sliding groove 521 to limit the movement of the stopper 62 in the second direction. In order to prevent the control rod 63 from swinging back, a stopper 622 is provided in the mounting groove 621. When the control rod 63 swings downward to lock the stopper 62, the stopper 622 just contacts the side wall of the control rod 63 to prevent the control rod 63 from rotating around the moving rod 61 and swinging back. When the control rod 63 swings upward, the control rod 63 and the inner wall 624 of the installation groove 621 will be clearance-matched, so that the moving rod 61 and the baffle 62 are unlocked, and the baffle 62 can move along the moving rod 61. Two inclined grooves 623 are also provided in the installation groove 621. The control rod 63 is provided with a protrusion 631 that matches the two grooves 623. The protrusion 631 is elastically connected to the control rod 63. Under the action of external force, the control rod 63 can rotate, otherwise, the protrusion 631 will abut against the side wall of the groove 623 to fix the control rod 63. The adjustment mechanism 6 moves along the moving rod 61 and the sliding groove 521 to adapt to printing papers of different paper widths, and then the control rod 63 locks the baffle 62. The baffle 62 and the control rod 63 are interference-fitted to directly lock the moving rod 61, thereby realizing the adjustment and fixation of the printing paper width of the paper bin 5. In this way, the printing paper is stably fixed after adjustment, and the operation is simple.

[0056] like Fig.10 As shown, the baffle plate 62 is provided with a mounting groove 621 for the control rod 63, so that the portion where the baffle plate 62 contacts the moving rod 61 is too small when the baffle plate 62 is in interference fit. In order to prevent loosening, a reinforcement portion 625 is formed by extending the baffle plate 62 along the direction of the moving rod 61. The reinforcement portion 625 has a curved surface adapted to a certain direction of the moving rod 61, so that when the control rod 63 locks the baffle plate 62, the reinforcement portion 625 completely contacts the moving rod 61.

[0057] If the width of the printing paper is too small, the width of the paper path is constant during the printing process. The smaller the width of the printing paper, the easier it is to deviate on the paper path, which will cause errors during printing and affect the printing quality. Therefore, it is necessary to set a minimum paper width. A fixed block 522 is provided on the sliding groove 521 to limit the movement of the baffle 62 to form a printing paper bin 5 with a minimum paper width. The moving rod 61 and the upper surface of the lower cavity 52 form a limiting channel to limit the movement of the printing paper. The limiting channel is connected to the paper path to allow the printing paper to be more smoothly transmitted toward the printing roller.

[0058] A step for accommodating the adjustment mechanism 6 is provided on the side of the upper bracket 21, and a wire groove 216 for the wires to pass through is provided on the back of the step, so that the wires connected through the control button 4 or the main body 1 are placed in the wire groove 216, which is conducive to the tidiness of the wires and can prevent the wires from being easily damaged by friction with the upper shell 22 when exposed on the side.

[0059] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A paper jam prevention printer, comprising a main body and an upper cover, wherein the upper cover is pivotally connected to the main body and can rotate around a pivot axis to correspondingly open or close the printer; when the main body and the upper cover are closed, a paper bin for storing printing paper, a paper feeding channel for printing paper and a printing paper output port are sequentially formed, wherein a printing unit is provided on the paper feeding channel; characterized in that: The main body and the upper cover body are combined to form a prism body with at least four prisms, the output port and the pivot axis are respectively located on two non-adjacent prisms, and the joint surface is located between the two non-adjacent prisms and cuts the printer along the prism direction; The main body and the upper cover are triangular in shape in the first direction, the paper bin is close to the pivot shaft end, and the printer is inclined along the outer contour of the paper bin toward the printing unit and is provided with a control circuit board, a reduction gear set and a motor for controlling or driving the printing unit.

2. The anti-paper jam printer according to claim 1, characterized in that: The printing unit comprises a thermal head and a printing roller which are arranged opposite to each other, one of which is arranged on the upper cover body, and the other is arranged on the main body.

3. The anti-paper jam printer according to claim 1, characterized in that: An upper cavity forming the paper bin is provided on one side of the upper cover body close to the pivot axis, a control circuit board is provided on the back of the upper cavity, and the control circuit board is arranged along the top of the upper cavity and tilted toward the output port.

4. The anti-paper jam printer according to claim 2, characterized in that: The main body includes a base and a lower shell, and a lower cavity forming the paper bin is provided on one side of the base close to the pivot axis, and a battery, a motor and a reduction gear set are arranged in sequence on the back side of the lower cavity from the height to the printing roller, and the reduction gear set is connected to the printing roller.

5. The anti-paper jam printer according to claim 4, characterized in that: An adjusting mechanism for fixing printing papers of different widths is arranged in the lower cavity of the main body.

6. The anti-paper jam printer according to claim 5, characterized in that: The adjusting mechanism comprises a moving rod and a blocking piece arranged on the moving rod, wherein the blocking piece can move along the moving rod, and the moving rod is parallel to the pivot axis.

7. The anti-paper jam printer according to claim 1, characterized in that: The length of the paper feeding channel is less than 3.0 cm.

8. The anti-paper jam printer according to claim 1, characterized in that: The paper feeding channel is provided with a detection device for detecting printing paper information.

9. The anti-paper jam printer according to claim 8, characterized in that: The detection device comprises a transmitting unit and a receiving unit, one of which is arranged on the main body and the other is arranged on the upper cover.

10. The anti-paper jam printer according to claim 1, characterized in that: A cutter for cutting the printing paper is arranged at the output port.

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