Printing mechanism and printer

Abstract

The utility model relates to the technical field of printing, in particular to a printing mechanism and a printer, the printing mechanism comprises a support, a printing head and a ribbon tension detection assembly, the support is provided with a guide groove, the ribbon tension detection assembly comprises a sensor, a tensioning shaft, an elastic piece and a detection piece, the tensioning shaft is used for tensioning a ribbon and can move along the guide groove, and the elastic piece is used for detecting the ribbon tension. The elastic piece enables the tensioning shaft to always have the movement trend of tensioning the colored tape; the tensioning shaft can drive the detection piece to synchronously move along the guide groove under the action of tension of the ribbon, when the tension of the ribbon is equal to a critical value, the detection piece is located at the position where the trigger sensor outputs one of the first signal and the second signal, and when the tension of the ribbon is smaller than the critical value, the detection piece is located at the position where the trigger sensor outputs the second signal. The detection member is located at a position at which the trigger sensor outputs the other of the first signal and the second signal. According to the printing mechanism and the printer, the problem of deformation or breakage of the colored tape caused by overlarge tension of the colored tape can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of printing, in particular to a printing mechanism and a printer. Background Art

[0002] Printers such as thermal transfer and thermal sublimation heat the ribbon through the print head and transfer the ink on the ribbon to the paper to form an image. They have the advantages of fast printing speed, clear printed images and long storage time.

[0003] The existing printers of this type generally include a ribbon recovery shaft and a ribbon delivery shaft. The ribbon delivery shaft is used to support an unused ribbon roll. The ribbon is released from the ribbon roll and is wound around the ribbon recovery shaft after passing through the print head. As the printing time increases, the ribbon on the ribbon delivery shaft will gradually be recovered to the ribbon recovery shaft, which will cause the diameter of the ribbon roll on the ribbon delivery shaft to continue to decrease, while the diameter of the ribbon recovery shaft will continue to increase, causing the tension of the ribbon to change continuously. The rotation speeds of the ribbon delivery shaft and the ribbon recovery shaft are difficult to adjust in time according to the current tension of the ribbon. When the tension of the ribbon is too large, it is easy to cause the ribbon to deform or break. Therefore, the existing printers have the problem of poor reliability. Utility Model Content

[0004] The utility model aims to provide a printing mechanism and a printer, so as to reduce the tension of the ribbon when the tension of the ribbon is too large, avoid the ribbon from being deformed or broken, and improve reliability.

[0005] On the one hand, the utility model provides a printing mechanism, which includes a bracket, a print head and a ribbon tension detection component both mounted on the bracket, the bracket being provided with a guide groove, and the ribbon tension detection component comprising:

[0006] A sensor, fixedly mounted on the bracket, comprising a light emitter and a light receiver arranged opposite to each other and spaced apart, wherein when the light receiver receives the light emitted by the light emitter, the sensor outputs a first signal, and when the light receiver does not receive the light emitted by the light emitter, the sensor outputs a second signal;

[0007] A tensioning shaft extending along the width direction of the ribbon and used for tensioning the ribbon, the tensioning shaft being plugged into the guide groove and being movable along the guide groove;

[0008] an elastic member configured to make the tensioning shaft always have a movement tendency to tension the ribbon;

[0009] A detection member is used to cooperate with the sensor. The tensioning shaft can drive the detection member to move synchronously along the extension direction of the guide groove under the action of the tension of the ribbon. When the tension of the ribbon is equal to a critical value, the detection member is located at a position that triggers the sensor to output one of the first signal and the second signal. When the tension of the ribbon is less than the critical value, the detection member is located at a position that triggers the sensor to output the other of the first signal and the second signal.

[0010] As a preferred technical solution of the printing mechanism, the tensioning shaft can also rotate around its own axis;

[0011] The ribbon tension detection assembly also includes a connecting piece rotatably mounted on the end of the tensioning shaft, the tensioning shaft can drive the connecting piece to move synchronously along the extension direction of the guide groove, the detection piece is connected to the connecting piece, and along the extension direction of the guide groove, the detection piece moves synchronously with the connecting piece.

[0012] As an optimal technical solution for the printing mechanism, the bracket is provided with a limiting groove parallel to the guide groove, the connecting member includes a sleeve and a connecting rod, the sleeve is rotatably sleeved on the tensioning shaft, one end of the connecting rod is fixedly connected to the sleeve, the other end of the connecting rod is plugged into the limiting groove, and the detection member is fixedly connected to the connecting rod.

[0013] As a preferred technical solution of the printing mechanism, the bracket includes two side walls spaced apart in the ribbon width direction, each of the side walls is provided with the guide groove, the two ends of the tensioning shaft are respectively plugged into the guide grooves of the two side walls, and the ribbon tension detection assembly includes two connecting pieces, the two connecting pieces are arranged in a one-to-one correspondence with the two side walls, and the two connecting pieces are arranged in a one-to-one correspondence with the two ends of the tensioning shaft;

[0014] Each of the connecting members comprises a sleeve and a connecting rod fixedly connected to the sleeve, the sleeve is rotatably sleeved on the corresponding end of the tensioning shaft, and the connecting member is slidably connected to the corresponding side wall and can move along the extension direction of the guide groove;

[0015] The elastic member includes two compression springs, and the two compression springs and the two connecting rods are arranged in a one-to-one correspondence. Each compression spring is sleeved with the corresponding connecting rod, and the first end of the compression spring abuts against the sleeve, and the second end of the compression spring abuts against the bracket, and the detection member is fixedly connected to one of the two connecting rods.

[0016] As a preferred technical solution for the printing mechanism, each of the side walls is fixedly connected to two limit blocks, the two limit blocks are spaced apart to form a limit groove, the connecting rod of each connecting member is plugged into the limit groove on the corresponding side wall, and the second end of each compression spring abuts against the two limit blocks on the corresponding side wall at the same time.

[0017] As a preferred technical solution of the printing mechanism, the detection member is located between the light emitter and the light receiver, and the detection member includes a plate body connected to the connecting rod and a detection hole opened in the plate body;

[0018] When the tension of the ribbon is a critical value, the detection hole is located between the light emitter and the light receiver, the light receiver can receive the light emitted by the light emitter, and triggers the sensor to output the first signal; when the tension of the ribbon is less than the critical value, the plate is located between the light emitter and the light receiver, the light receiver cannot receive the light emitted by the light emitter, and triggers the sensor to output the second signal;

[0019] Along the extending direction of the guide groove, the detection hole has a first width; along the axial direction of the tensioning shaft, the detection hole has a second width, and the second width is greater than the first width.

[0020] As a preferred technical solution for the printing mechanism, the tensioning shaft includes a core shaft plugged into the guide groove, and a roller rotatably mounted on the core shaft, the end of the core shaft is provided with two parallel and spaced-apart limiting planes, the distance between the two limiting planes matches the width of the guide groove, the roller is used to support the ribbon, and the detection member is connected to the end of the core shaft.

[0021] As a preferred technical solution for the printing mechanism, the detection element includes a light-shielding portion and a light-transmitting portion. When the tension of the ribbon is a critical value, the light-transmitting portion is located between the light emitter and the light receiver, and the light receiver can receive the light emitted by the light emitter and trigger the sensor to output the first signal; when the tension of the ribbon is less than the critical value, the light-shielding portion is located between the light emitter and the light receiver, and the light receiver cannot receive the light emitted by the light emitter and triggers the sensor to output the second signal.

[0022] As a preferred technical solution of the printing mechanism, the printing mechanism further includes an adjusting member and two fastening members;

[0023] The adjusting member comprises:

[0024] A fixing plate, wherein two long holes are arranged at intervals along the width direction of the ribbon, and an extending direction of the long holes is arranged at an angle to the width direction of the ribbon;

[0025] A support plate, wherein the first end of the support plate is connected to the fixed plate at an angle, the other end of the support plate extends toward the print head, the support plate is used to support the ribbon, and the two fasteners are respectively passed through the two long holes and fixedly connected to the print head.

[0026] The printing mechanism provided by the utility model has at least the following beneficial effects:

[0027] The printing mechanism includes a bracket, and a print head and a ribbon tension detection assembly both mounted on the bracket. The bracket is provided with a guide groove, and the ribbon tension detection assembly includes a sensor, a tensioning shaft, an elastic member and a detection member. The sensor is fixedly mounted on the bracket, and the sensor includes a light emitter and a light receiver that are arranged oppositely and at intervals. When the light receiver receives the light emitted by the light emitter, the sensor outputs a first signal, and when the light receiver does not receive the light emitted by the light emitter, the sensor outputs a second signal; the tensioning shaft extends along the width direction of the ribbon and is used to tension the ribbon, and the tensioning shaft is plugged into the guide groove and can move along the guide groove; the elastic member is configured to make the tensioning shaft always have a movement trend of tensioning the ribbon; the detection member is used to cooperate with the sensor, and the tensioning shaft can drive the detection member to move synchronously along the extension direction of the guide groove under the action of the tension of the ribbon, and when the tension of the ribbon is equal to the critical value, the detection member is located at a position that triggers the sensor to output one of the first signal and the second signal, and when the tension of the ribbon is less than the critical value, the detection member is located at a position that triggers the sensor to output the other of the first signal and the second signal. The printing mechanism provided by the embodiment of the utility model can determine whether the tension of the ribbon is equal to a critical value based on the signal output by the detection component trigger sensor. When the tension of the ribbon is equal to the critical value, the tension of the ribbon can be reduced in time to prevent the ribbon from being deformed or broken due to excessive tension of the ribbon, thereby improving the reliability of the printing mechanism.

[0028] On the other hand, the utility model provides a printer, comprising the printing mechanism of any of the above-mentioned schemes, the printer also comprising a ribbon dispensing shaft, a ribbon recovery shaft and a printing rubber roller cooperating with the print head, the ribbon dispensing shaft is used to support unused ribbons, the ribbon recovery shaft is used to recover used ribbons, and along the ribbon conveying direction, the ribbon dispensing shaft, the print head, the tensioning shaft and the ribbon recovery shaft are arranged in sequence.

[0029] The printer provided by the utility model has at least the following beneficial effects:

[0030] The printer includes the printing mechanism in the above solution, which can avoid the problem of ribbon deformation or breakage caused by excessive ribbon tension. In addition, the ribbon tension detection component is integrated on the printing mechanism, making the printer structure more compact and more integrated. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the structure of a printer in an embodiment of the utility model;

[0032] Figure 2 The structure of the printing mechanism in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0033] Figure 3 The structure of the printing mechanism in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0034] Figure 4 This is an exploded view of the printing mechanism in the embodiment of the utility model;

[0035] Figure 5 It is a schematic diagram of the partial structure of the printing mechanism in the embodiment of the utility model;

[0036] Figure 6 for Figure 1 Magnified view at A in the middle.

[0037] In the figure:

[0038] 100, printing mechanism; 200, ribbon dispensing shaft; 300, ribbon recovery shaft; 400, printing rubber roller; 500, ribbon;

[0039] 10. bracket; 101. guide groove; 102. limit groove; 103. limit block; 104. first side wall; 105. second side wall; 106. connecting wall; 20. print head; 30. ribbon tension detection assembly;

[0040] 1. Sensor; 11. Light transmitter; 12. Light receiver;

[0041] 2. Tensioning shaft;

[0042] 3. Elastic member; 31. Compression spring;

[0043] 4. detection part; 41. plate body; 42. detection hole;

[0044] 5. Connecting piece; 51. Sleeve; 52. Connecting rod;

[0045] 6. Adjusting member; 61. Fixing plate; 611. Long hole; 62. Supporting plate;

[0046] 7. Fasteners. DETAILED DESCRIPTION

[0047] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] Please refer to Figure 1The present embodiment provides a printer, which includes a printing mechanism 100, a ribbon dispensing shaft 200, a ribbon recovery shaft 300, and a printing rubber roller 400 matched with a print head 20 of the printing mechanism 100. The ribbon dispensing shaft 200 is used to support an unused ribbon 500, and the ribbon recovery shaft 300 is used to recover the used ribbon 500. Along the conveying direction of the ribbon 500, the ribbon dispensing shaft 200, the print head 20, the tensioning shaft 2 of the printing mechanism 100, and the ribbon recovery shaft 300 are arranged in sequence. The ribbon 500 released by the ribbon dispensing shaft 200 is recovered to the ribbon recovery shaft 300 after printing by the print head 20, and the tensioning shaft 2 of the printing mechanism 100 is used to tension the passing ribbon 500.

[0052] Specifically, when the printer is working, the printing medium such as paper passes between the printing rubber roller 400 and the ribbon 500, and the printing rubber roller 400 rotates to drive the printing medium to move; the print head 20 is a thermal printing head, and the heating element of the thermal printing head is energized to generate heat, thereby heating the coating on the ribbon 500, and the coating is transferred or sublimated to the surface of the printing medium to form an image or text.

[0053] In this embodiment, the printer further includes a ribbon recovery motor (not shown in the drawings), which is in driving connection with the ribbon recovery shaft 300 and is used to drive the ribbon recovery shaft 300 to rotate so as to wind the ribbon 500 around the ribbon recovery shaft 300. The printer further includes a control mechanism (not shown in the drawings), which is electrically connected to the ribbon recovery motor and the sensor 1 of the printing mechanism 100, and is used to receive a signal input by the sensor 1 and to control the torque of the ribbon recovery motor.

[0054] Please refer to Figures 2 to 6 The printing mechanism 100 includes a bracket 10, and a print head 20 and a ribbon tension detection assembly 30 both mounted on the bracket 10. The bracket 10 is provided with a guide groove 101, and the ribbon tension detection assembly 30 includes a sensor 1, a tensioning shaft 2, an elastic member 3 and a detection member 4. The sensor 1 is fixedly mounted on the bracket 10, and the sensor 1 includes a light emitter 11 and a light receiver 12 that are arranged oppositely and at intervals. When the light receiver 12 receives the light emitted by the light emitter 11, the sensor 1 outputs a first signal, and when the light receiver 12 does not receive the light emitted by the light emitter 11, the sensor 1 outputs a second signal; the tensioning shaft 2 is arranged along the width direction of the ribbon 500 (such as Figure 2 The tensioning shaft 2 is inserted into the guide groove 101 and can move along the guide groove 101; the elastic member 3 is configured to make the tensioning shaft 2 always have a movement tendency to tension the ribbon 500; the detection member 4 is used to cooperate with the sensor 1, and the tensioning shaft 2 can drive the detection member 4 to move synchronously along the extension direction of the guide groove 101 (such as Figure 2The detection element 4 moves in the direction indicated by the arrow cd in the figure, and when the tension of the ribbon 500 is equal to the critical value, the detection element 4 is located at a position where the sensor 1 outputs one of the first signal and the second signal, and when the tension of the ribbon 500 is less than the critical value, the detection element 4 is located at a position where the sensor 1 outputs the other of the first signal and the second signal. The printer provided by the embodiment of the utility model integrates the ribbon tension detection component 30 on the printing mechanism 100, making the structure of the printer more compact and more integrated.

[0055] When the tension on the ribbon 500 of the printer provided in this embodiment is greater than a critical value, the ribbon 500 will be deformed or broken. Therefore, when the detection member 4 is located at the position where the trigger sensor 1 outputs one of the first signal and the second signal, the control mechanism receives one of the first signal and the second signal output by the sensor 1, and determines that the tension on the ribbon 500 is equal to the critical value, so that the torque of the ribbon recovery motor can be controlled in time to reduce the tension on the ribbon 500 and avoid the deformation or breakage of the ribbon 500; when the detection member 4 is located at the position where the trigger sensor 1 outputs the other of the first signal and the second signal, the control mechanism receives the other of the first signal and the second signal output by the sensor 1, and determines that the tension on the ribbon 500 will not cause the ribbon 500 to deform or break, and then stops reducing the speed of the ribbon recovery motor. Therefore, the printing mechanism 100 provided in the present solution can detect the tension of the ribbon 500 through the cooperation of the sensor 1 and the detection element 4. When the tension of the ribbon 500 is too large, the rotation speed of the ribbon recovery motor can be reduced in time to reduce the tension of the ribbon 500, so as to prevent the deformation or breakage of the ribbon 500 caused by the excessive tension of the ribbon 500.

[0056] In this embodiment, when the tension of the ribbon 500 is equal to the critical value, the detection member 4 is located at the position that triggers the sensor 1 to output the first signal, and the sensor 1 outputs the first signal. When the tension of the ribbon 500 is less than the critical value, the detection member 4 is located at the position that triggers the sensor 1 to output the second signal, and the sensor 1 outputs the second signal.

[0057] For details, please refer to Figure 4 The detection member 4 includes a light-shielding portion and a light-transmitting portion. When the tension of the ribbon 500 is a critical value, the light-transmitting portion is located between the light emitter 11 and the light receiver 12, and the light receiver 12 can receive the light emitted by the light emitter 11, triggering the sensor 1 to output a first signal. When the tension of the ribbon 500 is less than the critical value, the light-shielding portion is located between the light emitter 11 and the light receiver 12, and the light receiver 12 cannot receive the light emitted by the light emitter 11, triggering the sensor 1 to output a second signal.

[0058] In other embodiments, it can also be arranged that when the tension of the ribbon 500 is equal to the critical value, the detection member 4 is located at the position where the trigger sensor 1 outputs the second signal; when the tension of the ribbon 500 is less than the critical value, the detection member 4 is located at the position where the trigger sensor 1 outputs the first signal.

[0059] Optionally, in this embodiment, the extension direction of the guide groove 101 is perpendicular to the thickness direction of the ribbon 500. Such a configuration can effectively improve the tensioning effect of the tensioning shaft 2. In other embodiments, the extension direction of the guide groove 101 can also be at an angle to the thickness direction of the ribbon 500.

[0060] Optionally, see Figures 2 to 5 , the tension shaft 2 can also rotate around its own axis; the ribbon tension detection assembly 30 also includes a connecting member 5 rotatably sleeved on the end of the tension shaft 2, and the tension shaft 2 can drive the connecting member 5 to move synchronously along the extension direction of the guide groove 101; the detection member 4 is connected to the connecting member 5, and along the extension direction of the guide groove 101, the detection member 4 moves synchronously with the connecting member 5. In this way, by making the tension shaft 2 rotate around its own axis, the tension shaft 2 can rotate along with the movement of the ribbon 500 when supporting the ribbon 500, which can effectively reduce the resistance of the ribbon 500; in addition, since the connecting member 5 is rotatably sleeved on the tension shaft 2, when the tension shaft 2 rotates, the connecting member 5 can be prevented from rotating with the tension shaft 2, and when the tension shaft 2 moves along the extension direction of the guide groove 101, the connecting member 5 can move synchronously along the extension direction of the guide groove 101. In other embodiments, the tensioning shaft 2 can only move along the guide groove 101 with the detection member 4 but cannot rotate around its own axis, and the detection member 4 is directly fixedly connected to the tensioning shaft 2 .

[0061] As an alternative solution, the tensioning shaft 2 includes a core shaft plugged into the guide groove 101, and a roller rotatably mounted on the core shaft, the end of the core shaft is provided with two parallel and spaced limiting planes, the distance between the two limiting planes matches the width of the guide groove 101, the roller is used to support the ribbon 500, and the detection member 4 is connected to the end of the core shaft. In this way, the core shaft can limit the rotation of the core shaft through the cooperation of the two limiting planes and the guide groove 101, so that the core shaft can only slide along the extension direction of the guide groove 101, so that when the tensioning shaft 2 supports the ribbon 500, the core shaft itself does not rotate, but can be rotated around the core shaft by the roller mounted outside the core shaft to reduce the resistance of the ribbon 500.

[0062] Optionally, see Figures 3 to 5The bracket 10 is provided with a limiting groove 102 parallel to the guide groove 101, the connecting member 5 includes a sleeve 51 and a connecting rod 52, the sleeve 51 is rotatably sleeved on the tensioning shaft 2, one end of the connecting rod 52 is fixedly connected to the sleeve 51, the other end of the connecting rod 52 is plugged into the limiting groove 102, and the detection member 4 is fixedly connected to the connecting rod 52. By providing the limiting groove 102 parallel to the guide groove 101 on the bracket 10, when the tensioning shaft 2 rotates around its own axis, the limiting groove 102 limits the connecting rod 52 and the sleeve 51 to rotate with the tensioning shaft 2, and when the tensioning shaft 2 moves along the extension direction of the guide groove 101, the limiting groove 102 limits the connecting rod 52 and the detection member 4 fixed to the connecting rod 52 to move only along the extension direction of the limiting groove 102, that is, the connecting rod 52 and the detection member 4 can only move along the extension direction of the guide groove 101, so as to realize that the detection member 4 and the tensioning shaft 2 move synchronously along the extension direction of the guide groove 101.

[0063] Optionally, see Figures 2 to 4 The bracket 10 includes two side walls arranged at intervals along the width direction of the ribbon 500, each of which is provided with a guide groove 101, and the two ends of the tensioning shaft 2 are respectively plugged into the guide grooves 101 of the two side walls. The ribbon tension detection assembly 30 includes two connecting members 5, and the two connecting members 5 are arranged one-to-one with the two side walls, and the two connecting members 5 are arranged one-to-one with the two ends of the tensioning shaft 2; each connecting member 5 includes a sleeve 51 and a connecting rod 52 fixedly connected to the sleeve 51, the sleeve 51 is rotatably sleeved on the end of the corresponding tensioning shaft 2, the connecting member 5 is slidably connected to the corresponding side wall and can move along the extension direction of the guide groove 101; the elastic member 3 includes two compression springs 31, the two compression springs 31 and the two connecting rods 52 are arranged one-to-one, each compression spring 31 is sleeved with the corresponding connecting rod 52, and the first end of the compression spring 31 abuts against the sleeve 51, and the second end of the compression spring 31 abuts against the bracket 10; the detection member 4 is fixedly connected to one of the two connecting rods 52. In this configuration, the two compression springs 31 respectively provide elastic force to the tensioning shaft 2 from both ends of the tensioning shaft 2, which can ensure that the tensioning shaft 2 is more stably in contact with the entire width of the ribbon 500, and can also ensure that the direction of the tensioning shaft 2 when moving along the extension direction of the guide groove 101 can remain stable; in addition, it is also convenient to select a suitable connecting rod 52 from the two connecting rods 52 to fix the detection member 4 according to the actual occupation of the internal space of the printer, which can make the printer more compact. In other embodiments, the compression spring 31 can also be replaced by a tension spring, a disc spring, etc.

[0064] It should be noted that the present embodiment does not limit the number of detection members 4 and sensors 1. In other embodiments, the ribbon tension detection assembly 30 may also include two detection members 4 and two sensors 1, which are arranged one-to-one, and the two detection members 4 are respectively installed on two connecting rods 52. Under the action of the tension of the ribbon 500, when the tensioning shaft 2 drives the connecting member 5 and the detection member 4 to move synchronously along the extension direction of the guide groove 101, when any detection member 4 triggers the corresponding sensor 1 to output the first signal, it indicates that the tension of the ribbon 500 is equal to the critical value at this time; when the two detection members 4 simultaneously trigger the corresponding sensors 1 to output the second signal, it indicates that the tension of the ribbon 500 is less than the critical value at this time.

[0065] Optionally, see Figure 2 , Figure 4 and Figure 5 Each side wall is fixedly connected with two limit blocks 103, the two limit blocks 103 are arranged at intervals and form a limit groove 102, the connecting rod 52 of each connecting member 5 is plugged into the limit groove 102 on the corresponding side wall, and the second end of each compression spring 31 is simultaneously in contact with the two limit blocks 103 on the corresponding side wall. In this way, the limit groove 102 can be formed on each side wall by the two limit blocks 103, and the position of the compression spring 31 can also be limited by the limit blocks 103, so that the structure of the printing mechanism 100 is more streamlined.

[0066] Optionally, see Figures 2 to 4 The bracket 10 also includes a connecting wall 106 connecting the two side walls. The print head 20 is located between the two side walls. The ribbon 500 is supported by the tensioning shaft 2 between the two side walls, and both ends of the tensioning shaft 2 can move along the guide grooves 101 of the two side walls. Connecting the two side walls through the connecting wall 106 can ensure the stability of the bracket 10 structure, thereby ensuring the stability of the support effect on the tensioning shaft 2. Specifically, the two side walls are respectively a first side wall 104 and a second side wall 105, the end of the first end of the tensioning shaft 2 is plugged into the guide groove 101 on the first side wall 104, and the end of the second end of the tensioning shaft 2 is plugged into the guide groove 101 on the second side wall 105, the detection member 4 is sleeved on the connecting rod 52 of the connecting member 5 corresponding to the end of the first end of the tensioning shaft 2, and the sensor 1 is correspondingly installed on the first side wall 104. When the tensioning shaft 2 drives the connecting member 5 to move along the extension direction of the guide groove 101, one of the light-shielding part and the light-transmitting part of the detection member 4 enters between the light emitter 11 and the light receiver 12, and the other of the two exits between the light emitter 11 and the light receiver 12.

[0067] Optionally, see Figure 4The light-shielding portion of the detection member 4 is a plate body 41, and the light-transmitting portion is a detection hole 42 opened in the plate body 41. The plate body 41 is connected to the connecting rod 52, and the plate body 41 is located between the light emitter 11 and the light receiver 12; when the tension of the ribbon 500 is a critical value, the detection hole 42 is located between the light emitter 11 and the light receiver 12, and the light receiver 12 can receive the light emitted by the light emitter 11, and the sensor 1 is triggered to output a first signal; when the tension of the ribbon 500 is less than the critical value, the plate body 41 is located between the light emitter 11 and the light receiver 12, and the light receiver 12 is blocked by the plate body 41 and cannot receive the light emitted by the light emitter 11, and the sensor 1 is triggered to output a second signal. Along the extension direction of the guide groove 101, the detection hole 42 has a first width; along the axial direction of the tensioning shaft 2 (such as Figure 2 The detection hole 42 has a second width, and the second width is greater than the first width. By making the detection hole 42 have a larger second width along the axial direction of the tensioning shaft 2, the detection hole 42 can reliably cooperate with the sensor 1 even if the tensioning shaft 2 moves along its axial position.

[0068] In other embodiments, the detection member 4 includes a plate body 41 connected to the connecting rod 52. When the tension of the ribbon 500 is a critical value, the plate body 41 is located between the light emitter 11 and the light receiver 12, the light receiver 12 cannot receive the light emitted by the light emitter 11, and the trigger sensor 1 outputs a second signal; when the tension of the ribbon 500 is less than the critical value, the plate body 41 withdraws from between the light emitter 11 and the light receiver 12, the light receiver 12 can receive the light emitted by the light emitter 11, and the trigger sensor 1 outputs a first signal.

[0069] In addition, it should be noted that, in the present embodiment, the sensor 1 is specifically a photoelectric sensor, but the sensor 1 is not limited to a photoelectric sensor, and may also be replaced by a Hall sensor. Accordingly, the detection element 4 may be set as a component having magnetic properties.

[0070] Optionally, see Figure 6The printing mechanism 100 further includes an adjusting member 6 and two fasteners 7; the adjusting member 6 includes a fixing plate 61 and a supporting plate 62. The fixing plate 61 is provided with two long holes 611, which are arranged at intervals along the width direction of the ribbon 500, and the extending direction of the long holes 611 is set at an angle to the width direction of the ribbon 500; the first end of the supporting plate 62 is connected to the fixing plate 61 at an angle, and the other end of the supporting plate 62 extends toward the printing head 20, and the supporting plate 62 is used to support the ribbon 500, and the two fasteners 7 pass through the two long holes 611 respectively and are fixedly connected to the printing head 20. By supporting the ribbon 500 through the support plate 62 of the adjusting member 6, stress concentration between the print head 20 and the ribbon 500 can be avoided, thereby avoiding damage to the ribbon 500; in addition, by adjusting the relative position of the fastener 7 and the long hole 611, the support position of the support plate 62 on the ribbon 500 can be adjusted, thereby enabling the support plate 62 to support the ribbon 500 evenly and ensure the stability of the support for the ribbon 500. It should be noted that in this embodiment, the position of the adjusting member 6 is fixed when in use, so the adjusting member 6 can also supplement the tension of the ribbon 500. Specifically, along the conveying direction of the ribbon 500, the plate surface of the support plate 62 extends between the tensioning shaft 2 and the print head 20. By adjusting the position of the support plate 62, on the one hand, the ribbon 500 can be further tightened or loosened to adjust the tension of the ribbon 500, and on the other hand, other components can be shielded to avoid scratching the ribbon 500 and affecting the printing effect.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A printing mechanism, characterized in that: The invention comprises a bracket (10), a print head (20) and a ribbon tension detection assembly (30) both mounted on the bracket (10), wherein the bracket (10) is provided with a guide groove (101), and the ribbon tension detection assembly (30) comprises: A sensor (1) is fixedly mounted on the bracket (10), the sensor (1) comprising a light emitter (11) and a light receiver (12) which are arranged opposite to each other and at an interval, when the light receiver (12) receives the light emitted by the light emitter (11), the sensor (1) outputs a first signal, and when the light receiver (12) does not receive the light emitted by the light emitter (11), the sensor (1) outputs a second signal; A tensioning shaft (2) extending along the width direction of the color ribbon (500) and used for tensioning the color ribbon (500), wherein the tensioning shaft (2) is plugged into the guide groove (101) and can move along the guide groove (101); An elastic member (3) is configured to ensure that the tensioning shaft (2) always has a movement tendency to tension the ribbon (500); A detection member (4) is used to cooperate with the sensor (1); the tensioning shaft (2) can drive the detection member (4) to move synchronously along the extension direction of the guide groove (101) under the action of the tension of the ribbon (500); and when the tension of the ribbon (500) is equal to a critical value, the detection member (4) is located at a position triggering the sensor (1) to output one of the first signal and the second signal; when the tension of the ribbon (500) is less than the critical value, the detection member (4) is located at a position triggering the sensor (1) to output the other of the first signal and the second signal.

2. The printing mechanism according to claim 1, characterized in that: The tensioning shaft (2) can also rotate around its own axis; The ribbon tension detection assembly (30) also includes a connecting member (5) rotatably mounted on the end of the tensioning shaft (2), and the tensioning shaft (2) can drive the connecting member (5) to move synchronously along the extension direction of the guide groove (101), and the detection member (4) is connected to the connecting member (5), and along the extension direction of the guide groove (101), the detection member (4) moves synchronously with the connecting member (5).

3. The printing mechanism according to claim 2, characterized in that: The bracket (10) is provided with a limiting groove (102) parallel to the guide groove (101); the connecting member (5) comprises a sleeve (51) and a connecting rod (52); the sleeve (51) is rotatably sleeved on the tensioning shaft (2); one end of the connecting rod (52) is fixedly connected to the sleeve (51); the other end of the connecting rod (52) is plugged into the limiting groove (102); and the detecting member (4) is fixedly connected to the connecting rod (52).

4. The printing mechanism according to claim 2, characterized in that: The bracket (10) comprises two side walls spaced apart along the width direction of the ribbon (500), each of the side walls being provided with the guide groove (101), the two ends of the tensioning shaft (2) being respectively plugged into the guide grooves (101) of the two side walls, the ribbon tension detection assembly (30) comprising two connecting members (5), the two connecting members (5) being arranged in one-to-one correspondence with the two side walls, and the two connecting members (5) being arranged in one-to-one correspondence with the two ends of the tensioning shaft (2); Each of the connecting members (5) comprises a sleeve (51) and a connecting rod (52) fixedly connected to the sleeve (51); the sleeve (51) is rotatably sleeved on the end of the corresponding tensioning shaft (2); the connecting member (5) is slidably connected to the corresponding side wall and can move along the extension direction of the guide groove (101); The elastic member (3) comprises two compression springs (31), the two compression springs (31) and the two connecting rods (52) are arranged in one-to-one correspondence, each compression spring (31) is sleeved with the corresponding connecting rod (52), and the first end of the compression spring (31) abuts against the sleeve (51), and the second end of the compression spring (31) abuts against the bracket (10), and the detection member (4) is fixedly connected to one of the two connecting rods (52).

5. The printing mechanism according to claim 4, characterized in that: Each of the side walls is fixedly connected to two limit blocks (103), the two limit blocks (103) are spaced apart to form a limit groove (102), the connecting rod (52) of each connecting member (5) is plugged into the limit groove (102) on the corresponding side wall, and the second end of each compression spring (31) is simultaneously in contact with the two limit blocks (103) on the corresponding side wall.

6. The printing mechanism according to claim 4, characterized in that: The detection member (4) is located between the light transmitter (11) and the light receiver (12), and the detection member (4) comprises a plate body (41) connected to the connecting rod (52) and a detection hole (42) opened in the plate body (41); When the tension of the ribbon (500) is a critical value, the detection hole (42) is located between the light emitter (11) and the light receiver (12), and the light receiver (12) is able to receive the light emitted by the light emitter (11), and trigger the sensor (1) to output the first signal; when the tension of the ribbon (500) is less than the critical value, the plate (41) is located between the light emitter (11) and the light receiver (12), and the light receiver (12) is unable to receive the light emitted by the light emitter (11), and triggers the sensor (1) to output the second signal; Along the extension direction of the guide groove (101), the detection hole (42) has a first width; along the axial direction of the tensioning shaft (2), the detection hole (42) has a second width, and the second width is greater than the first width.

7. The printing mechanism according to claim 1, characterized in that: The tensioning shaft (2) comprises a core shaft plugged into the guide groove (101), and a roller rotatably mounted on the core shaft, the end of the core shaft is provided with two parallel and spaced limiting planes, the distance between the two limiting planes matches the width of the guide groove (101), the roller is used to support the ribbon (500), and the detection member (4) is connected to the end of the core shaft.

8. The printing mechanism according to claim 1, characterized in that: The detection element (4) comprises a light shielding portion and a light transmitting portion. When the tension of the color ribbon (500) is a critical value, the light transmitting portion is located between the light emitter (11) and the light receiver (12), and the light receiver (12) can receive the light emitted by the light emitter (11) and trigger the sensor (1) to output the first signal. When the tension of the color ribbon (500) is less than the critical value, the light shielding portion is located between the light emitter (11) and the light receiver (12), and the light receiver (12) cannot receive the light emitted by the light emitter (11), and triggers the sensor (1) to output the second signal.

9. The printing mechanism according to any one of claims 1 to 8, characterized in that: The printing mechanism also includes an adjusting member (6) and two fastening members (7); The adjusting member (6) comprises: A fixing plate (61), wherein two long holes (611) are provided on the fixing plate (61), the two long holes (611) are arranged at intervals along the width direction of the ribbon (500), and the extending direction of the long holes (611) is arranged at an angle to the width direction of the ribbon (500); A support plate (62), wherein a first end of the support plate (62) is connected to the fixing plate (61) at an angle, and the other end of the support plate (62) extends toward the print head (20), and the support plate (62) is used to support the ribbon (500), and the two fasteners (7) respectively pass through the two long holes (611) and are fixedly connected to the print head (20).

10. A printer, characterized in that: The printer comprises the printing mechanism according to any one of claims 1 to 9, and the printer further comprises a ribbon dispensing shaft (200), a ribbon recovery shaft (300) and a printing rubber roller (400) cooperating with the print head (20), the ribbon dispensing shaft (200) being used to support unused ribbons (500), the ribbon recovery shaft (300) being used to recover used ribbons (500), and along the conveying direction of the ribbon (500), the ribbon dispensing shaft (200), the print head (20), the tensioning shaft (2) and the ribbon recovery shaft (300) being arranged in sequence.

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