Printer with replaceable printing head

Abstract

The invention discloses a printer with a replaceable printing head, and relates to the technical field of thermosensitive label printers, the printer comprises a printer main body and a printing head shell, the printer main body is provided with an elastic needle seat and a locking seat, the locking seat is internally provided with a fixing assembly, the printing head shell is internally provided with a thermosensitive printing head, and the printing head shell is internally provided with an elastic needle. A mounting box is arranged on one side of the printer body, a winding drum is arranged in the mounting box, a winding drum roller is arranged in the winding drum in a sleeved mode, a pushing mechanism is arranged in the winding drum roller, and a driving mechanism is arranged in the mounting box. The printer main body and the printing head shell are provided with the elastic needle base and the elastic needle respectively, the printing head shell is fixed through the fixing assembly, so that the printing head shell is convenient to disassemble, the winding drum can conveniently and uniformly discharge materials through the arrangement of the driving mechanism, and the button controller is arranged, so that the printing head shell can be conveniently disassembled. And a worker can be conveniently reminded to replace the winding drum.

Description

Technical Field

[0001] The invention relates to the technical field of thermal label printers, in particular to a printer with a replaceable print head. Background Art

[0002] Label printers have been widely used in many fields such as offices, factories, and shopping malls. The working principle of thermal printers is that semiconductor heating elements are installed on the print head. After the print head is heated and contacts the thermal printing paper, the required pattern can be printed. Its principle is similar to that of thermal fax machines. The image is generated by heating and chemical reactions in the film. The chemical reaction of this thermal printer is carried out at a certain temperature. High temperature will accelerate this chemical reaction. When the temperature is lower than 60℃, it takes a long time, even several years, for the paper to turn dark; when the temperature is 200℃, this reaction will be completed in a few microseconds. The core component of the print head assembly is the thermal film, which is a consumable part and needs to be replaced frequently. The print head of the existing printer cannot be replaced or the disassembly and installation of the print head is cumbersome, which makes it difficult to repair quickly when the print head is damaged.

[0003] Based on this, printers with replaceable print heads are now provided to eliminate the disadvantages of existing devices. Summary of the invention

[0004] The object of the present invention is to provide a printer with a replaceable print head, so as to solve the problem in the background art that it is inconvenient to quickly repair the print head.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A printer with a replaceable print head comprises a printer body and a print head housing, wherein the printer body is provided with a spring needle seat and a locking seat, the bottom end of the print head housing is provided with a spring needle used in conjunction with the spring needle seat, the locking seat is provided with a fixing assembly for fixing the print head housing, the print head housing is provided with a thermal print head, one side of the printer body is provided with a first connector, the first connector is electrically connected to a second connector, the second connector is fixedly provided on one side of an installation box, the installation box is provided with a reel, and the reel is sleeved with a reel roller The upper end of the printer body is provided with a guide component for guiding the printing material, a plurality of sliding grooves are provided on the roll roller at equal intervals, and a stop slider is slidably provided in the sliding grooves. A pushing mechanism for pushing the movement of the plurality of stop sliders is provided inside the roll roller, a pressing roller is closely attached to one side of the roll, and the pressing roller is rotatably arranged on the inner side of the rotating frame, one side of the rotating frame is respectively fixedly connected with the output ends of a plurality of spring telescopic rods, the spring telescopic rods are arranged in the mounting holes on one side of the mounting box, and a driving mechanism for driving the roll to discharge the material evenly is provided inside the mounting box.

[0007] On the basis of the above technical solution, the present invention also provides the following optional technical solution:

[0008] In an optional scheme: the fixing component includes two symmetrically arranged first limit frames, the two first limit frames are both slidably arranged inside the printer body, an installation groove is provided at the upper end of the locking seat corresponding to the position of one end of the first limit frame, a connecting plate is provided between the two first limit frames, a pressing rod is provided on one side of the connecting plate, a first return spring is provided between one end of the pressing rod and the inside of the printer body, a baffle is provided at one side of the printer body and one end of the pressing rod, and lock buckles are symmetrically provided at the bottom end of the print head shell corresponding to the position of the first limit frame.

[0009] In an optional scheme: the guide assembly includes a first guide roller and a mounting rotating plate, the two first guide rollers are symmetrically rotatable and arranged at the upper end of the printer body, the two mounting rotating plates are symmetrically rotatable and arranged at the upper end of the printer body, the inner side of the mounting rotating plate is symmetrically rotatable with a limiting roller, the limiting roller is aligned with the mounting position of the first guide roller, a second guide roller is rotatably arranged inside the mounting box, a plurality of fixed blocks are fixedly arranged on one side of the printer body, a sleeve pipe is fixedly arranged at a position corresponding to the fixed block position on one side of the mounting box, the sleeve pipe is sleeve-connected with the fixed block, and the sleeve pipe and the fixed block are fixedly connected by screws.

[0010] In an optional solution: an extension plate is fixedly provided on one side of one of the mounting rotating plates, a magnet is fixedly provided on the bottom end of the extension plate, and a mounting groove is provided on the other mounting rotating plate, and an adsorption iron plate is provided in the mounting groove.

[0011] In an optional scheme: the pushing mechanism includes a connecting rod, a connecting rod is hinged on one side of the stopping slider, and the other ends of several of the connecting rods are hinged to one end of the push rod, a second tension spring is provided between one end of the push rod and the inside of the reel roller, one end of the push rod is tightly provided with a guide rod, one end of the guide rod is inclined, the guide rod is fixedly arranged at the bottom end of the installation box, one end of the push rod is provided with a first ball, limit grooves are provided on both sides of the stopping slider, guide groove rods are slidably provided in the limit grooves, the guide groove rods are fixedly arranged inside the reel roller, support frame plates are rotatably provided at both ends of the reel roller, the support frame plates are fixedly arranged inside the installation box, and one of the support frame plates is provided with a limit component for fixing the reel roller.

[0012] In an optional solution: the limit assembly includes a second limit frame, a connection box is fixedly provided on a support frame plate, a second limit frame is slidably provided inside the connection box, a second return spring is provided between one side of the second limit frame and one side inside the installation box, and one end of the second limit frame extends to the inner side of the opening end of the support frame plate.

[0013] The transmission gear of claim 1, wherein the first gear is secured to the first and second gears and is secured on a platform with a first end connected to the base, the second gear being secured to the first and second gears being engaged with the first and second gears. The second gear wheel is connected with the drive gear of the driving member, and the driving member is connected with the control wheel to the control wheel shaft through the rotation of the spring which is located at the bottom of the transmission gear of the driving member.

[0014] In an optional scheme: a paper feed end plane is provided at the upper end of the printer body, and a paper outlet end plane is provided at the lower part of the printer body, the vertical working angle of the paper feed end plane is 0 to 90 degrees, preferably 30 to 60 degrees, the horizontal working angle of the paper outlet end plane is 0 to 90 degrees, preferably 30 to 60 degrees, and the angle between the paper feed end plane and the paper outlet end plane is 90 to 180 degrees, preferably 180 degrees.

[0015] In an optional solution: a button controller is fixedly provided on one side of the support frame plate, an extrusion frame is fixedly provided at a position of the rotating frame corresponding to the position of the button controller, and the button controller is electrically connected to the printer body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention arranges a spring needle seat and a spring needle on the printer body and the print head shell respectively, and fixes the print head shell by a fixing assembly, so that the print head shell is easy to disassemble, thereby facilitating replacement and maintenance of the print head shell. At the same time, an installation box is arranged on one side of the printer body, so that when the printing roll paper is used for printing, the roll with the printing roll paper can be placed inside the installation box, and a guide assembly is arranged inside the roll roller, so that the roll is conveniently fixed on the roll roller, so that when the roll roller rotates, the roll can follow the roll roller to rotate, and the first inner spline shaft and the active conical friction wheel are frictionally matched, and under the action of the pressing roller, the ejector rod and the guide block, when the winding diameter of the printing paper on the roll changes, the diameter of the contact section between the active conical friction wheel and the first inner spline shaft changes accordingly, so that the roll can be evenly discharged, and a button controller is arranged, so that when the printing roll paper on the roll is used up, the pressing frame can press the button controller, so as to remind the staff to replace the roll, thereby increasing the practicality of the printer with replaceable print head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the internal structure of the installation box of the present invention.

[0020] Figure 3 It is a schematic diagram of the main structure of the printer of the present invention.

[0021] Figure 4 It is a schematic diagram of the structure of the print head housing of the present invention.

[0022] Figure 5 It is a schematic diagram of the structure of the elastic needle seat of the present invention.

[0023] Figure 6 This is a schematic diagram of installing the first connector of the present invention.

[0024] Figure 7 This is a schematic diagram of installing the second connector of the present invention.

[0025] Figure 8 It is a schematic diagram of the winding roller structure of the present invention.

[0026] Fig. 9 It is a schematic diagram of the internal structure of the winding roller of the present invention.

[0027] Fig.10 It is a schematic structural diagram of the second limiting frame and the second transmission plate of the present invention.

[0028] Fig.11 It is a schematic diagram of the guide block and the push rod structure of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure of the driven conical friction wheel of the present invention.

[0030] Fig.13 This is a schematic diagram of the installation of the button controller of the present invention.

[0031] Notes on reference numerals: 11 printer body, 12 print head housing, 13 thermal print head, 14 spring needle, 15 spring needle seat, 16 locking seat, 17 lock, 18 first limit frame, 19 first return spring, 20 baffle, 21 paper feed end plane, 22 paper output end plane, 23 installation box, 24 first connector, 25 second connector, 26 reel, 27 reel roller, 28 support frame plate, 29 second limit frame, 30 second return spring, 31 stop slider, 32 connecting rod, 33 push rod , 34 guide rod, 35 first transmission plate, 36 second transmission plate, 37 transmission shaft, 38 worm wheel, 39 worm, 40 first gear, 41 second gear, 42 first internal spline shaft, 43 driven conical friction wheel, 44 third return spring, 45 active conical friction wheel, 46 tension spring, 47 second internal spline shaft, 48 motor, 49 guide block, 50 push rod, 51 pressing roller, 52 spring telescopic rod, 53 button controller, 54 first guide roller, 55 limiting roller, 56 installation rotating plate. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Example 1

[0034] In one embodiment, Figure 1-Figure 13As shown, a printer with replaceable print heads comprises a printer body 11 and a print head housing 12, wherein the printer body 11 is provided with a spring needle seat 15 and a locking seat 16, wherein the bottom end of the print head housing 12 is provided with a spring needle 14 used in conjunction with the spring needle seat 15, wherein the locking seat 16 is provided with a fixing assembly for fixing the print head housing 12, wherein the print head housing 12 is provided with a thermal print head 13, wherein one side of the printer body 11 is provided with a first connector 24, wherein the first connector 24 is electrically connected to a second connector 25, wherein the second connector 25 is fixedly provided on one side of an installation box 23, wherein the installation box 23 is provided with a reel 26, wherein a reel roller 27 is sleeved inside the reel 26, wherein the upper end of the printer body 11 is provided with a reel roller 27 for printing materials A guiding guide assembly, a plurality of sliding grooves are arranged at equal intervals on the reel roller 27, and stop sliders 31 are slidably arranged in the sliding grooves, and a pushing mechanism for pushing the movement of the plurality of stop sliders 31 is arranged inside the reel roller 27, and a pressing roller 51 is arranged closely on one side of the reel 26, and the pressing roller 51 is rotatably arranged on the inner side of the rotating frame, and one side of the rotating frame is respectively fixedly connected with the output ends of a plurality of spring telescopic rods 52, and the spring telescopic rods 52 are arranged in the mounting holes on one side of the mounting box 23, and a driving mechanism for driving the reel 26 to discharge materials evenly is arranged inside the mounting box 23, and the pushing mechanism makes it easy to push the plurality of stop sliders 31 to move, so as to fix the reel 26, and the driving mechanism makes it easy to drive the reel 26 to rotate, and at the same time, it is easy for the reel 26 to discharge materials evenly;

[0035] The fixing assembly includes two symmetrically arranged first limit frames 18, both of which are slidably arranged inside the printer body 11, and an installation groove is arranged at the upper end of the locking seat 16 corresponding to one end of the first limit frame 18, a connecting plate is arranged between the two first limit frames 18, a pressing rod is arranged on one side of the connecting plate, a first return spring 19 is arranged between one end of the pressing rod and the inside of the printer body 11, a baffle 20 is arranged at one side of the printer body 11 and one end of the pressing rod, and a lock buckle 17 is symmetrically arranged at the bottom end of the print head housing 12 corresponding to the position of the first limit frame 18. When in use, When the thermal print head 13 needs to be replaced, the push rod pushes the first limit frame 18 to move, so that one end of the first limit frame 18 is away from the lock 17, thereby removing the print head housing 12, and then installing and using the print head housing 12 with the intact thermal print head 13 installed, so that the print head housing 12 as a whole and the thermal print head 13 are replaced, and then the spring pin 14 is aligned with the spring pin hole on the spring pin seat 15, so that the spring pin 14 is inserted into the spring pin hole, so that the thermal print head 13 is electrically connected to the printer body 11, and at the same time the first limit frame 18 cooperates with the lock 17 to fix the print head housing 12.

[0036] The guide assembly includes a first guide roller 54 and a mounting rotating plate 56. The two first guide rollers 54 are symmetrically rotated and arranged at the upper end of the printer body 11. The two mounting rotating plates 56 are symmetrically rotated and arranged at the upper end of the printer body 11. The inner sides of the mounting rotating plates 56 are symmetrically rotated and provided with limiting rollers 55. The limiting rollers 55 are aligned with the mounting positions of the first guide rollers 54. A second guide roller is rotatably arranged inside the mounting box 23. A plurality of fixed blocks are fixedly arranged on one side of the printer body 11. One side of the mounting box 23 is aligned with the positions of the fixed blocks. A sleeve tube is fixedly provided at each location, and the sleeve tube is sleeve-connected with the fixed block, and the sleeve tube and the fixed block are fixedly connected by screws. During use, when the printer body 11 needs to print the printing roll paper, the installation rotating plate 56 is opened to make the limiting roller 55 move away from the first guide roller 54, so that one end of the printing roll paper passes through the second guide roller, the first guide roller 54, and the paper feed end plane 21 at the upper end of the printer body 11, and then one end of the paper roll moves out through the paper outlet end plane 22, and then the installation rotating plate 56 is closed, so that the limiting roller 55 limits the paper roll.

[0037] An extension plate is fixedly provided on one side of one of the mounting rotating plates 56, and a magnet is fixedly provided on the bottom end of the extension plate. A mounting groove is provided on the other mounting rotating plate 56, and an adsorption iron plate is provided in the mounting groove. When in use, when the two mounting rotating plates 56 are closed, the two mounting rotating plates 56 are fixed by cooperating with the adsorption iron plate.

[0038] The pushing mechanism includes a connecting rod 32, one side of the stopping slider 31 is hinged with a connecting rod 32, the other ends of several of the connecting rods 32 are hingedly connected to one end of the push rod 33, a second tension spring is provided between one end of the push rod 33 and the inside of the reel roller 27, one end of the push rod 33 is tightly provided with a guide rod 34, one end of the guide rod 34 is inclined, the guide rod 34 is fixedly arranged at the bottom end of the installation box 23, one end of the push rod 33 is provided with a first ball bearing, both sides of the stopping slider 31 are provided with limit grooves, guide groove rods are slidably provided in the limit grooves, and the guide groove rods are fixedly arranged inside the reel roller 27, and support frame plates 28 are rotatably provided at both ends of the reel roller 27, the support frame plates 28 are fixedly arranged inside the installation box 23, and one of the support frame plates 28 is provided with a limit component for fixing the reel roller 27.

[0039] The limiting assembly includes a second limiting frame 29, a connecting box is fixedly provided on the supporting frame plate 28, a second limiting frame 29 is slidably provided inside the connecting box, a second return spring 30 is provided between one side of the second limiting frame 29 and one side inside the installation box, one end of the second limiting frame 29 extends to the inner side of the opening end of the supporting frame plate 28, when in use, when the printing roll paper is installed, the roll roller 27 is taken out from the inside of the installation box 23, and then one end of the roll roller 27 is sleeved on the inner side of the roll 26 wound with the printing paper, and then the two ends of the roll roller 27 are rotated. Aligned with the two support frame plates 28, the second limit frame 29 is pulled so that the two ends of the reel roller 27 rotate to move to the inner side of the open end of the support frame plate 28, and at the same time, one end of the push rod 33 contacts the inclined surface of the guide rod 34, so that the guide rod 34 guides the push rod 33, so that the push rod 33 pushes the stop slider 31 to move through the connecting rod 32, and the outer side of the stop slider 31 is tightly attached to the inner side of the reel 26, thereby fixing the reel 26. When the reel roller 27 is installed, the second limit frame 29 is released, and the second limit frame 29 can fix the rotating shaft at one end of the reel roller 27.

[0040] The driving mechanism includes a second transmission disk 36, which is fixed on the rotating shaft at one end of the winding roller 27. A first transmission disk 35 is provided on one side of the second transmission disk 36. The first transmission disk 35 is fixed on one end of a transmission shaft 37. The transmission shaft 37 is rotatably arranged inside the installation box 23. A worm wheel 38 is fixed on the transmission shaft 37. A worm 39 is meshed on the worm wheel 38. Both ends of the worm 39 are rotatably provided with a first rotating plate. The first rotating plates are fixed inside the installation box 23. A first gear 40 is fixed on the rotating shaft at one end of the worm 39. A second gear 41 is meshed on the first gear 40. The second gear 41 is fixed on one end of the fixed shaft. A worm wheel 38 is meshed on the worm wheel 38. A worm 39 is meshed on the worm wheel 38. Both ends of the worm 39 are rotatably provided with a first rotating plate. The first rotating plates are fixed inside the installation box 23. A first gear 40 is fixed on the rotating shaft at one end of the worm 39. A second gear 41 is meshed on the first gear 40. The second gear 41 is fixed on one end of the fixed shaft. A plurality of second rotating plates, each of which is fixedly arranged at the bottom end of the mounting box 23, a first external spline shaft is fixedly arranged at one end of the fixed shaft, a first internal spline shaft 42 is slidably arranged on the first external spline shaft, the first internal spline shaft 42 is connected to the first external spline shaft by spline matching, a third return spring 44 is arranged between the first internal spline shaft 42 and one end of the first external spline shaft, a driven conical friction wheel 43 is fixedly arranged at one end of the first internal spline shaft 42, an active conical friction wheel 45 is frictionally and tightly arranged on the driven conical friction wheel 43, the active conical friction wheel 45 is fixedly arranged on the second internal spline shaft 47, the second internal spline shaft 47 is slidably arranged on the second external spline shaft, and the second external spline shaft is connected to the second internal spline shaft 47 by a spline. Through spline matching connection, a tension spring 46 is provided between one end of the second external spline shaft and one end of the second internal spline shaft 47, one end of the second external spline shaft is fixedly connected to the output end of the motor 48, the motor 48 is fixedly arranged at the bottom end of the installation box 23, a third rotating plate is rotatably provided on the second internal spline shaft 47, the third rotating plate is fixedly arranged at the bottom end of the sliding plate, sliding frames are slidably provided at both ends of the sliding plate, the sliding frames are fixedly arranged at the bottom end of the installation box 23, a guide block 49 is fixedly provided on one side of the sliding plate, a push rod 50 is tightly provided at the inclined surface of the guide block 49, the push rod 50 is fixedly arranged on one side of the rotating frame, the motor 48 is electrically connected to the printer body 11, and when in use, when the motor 48 is driven by an active conical friction When the wheel 45, the driven conical friction wheel 43, the second gear 41, the first gear 40, the worm 39 and the worm wheel 38 drive the reel 26 to rotate, the reel 26 can unfold the printing paper so that printing can be performed. As the printing paper on the reel 26 is used, the winding diameter on the reel 26 decreases. Under the action of the spring telescopic rod 52, the pressure roller 51 is always in close contact with the printing paper on the reel 26. When the pressure roller 51 changes with the winding diameter on the reel 26, the rotating frame drives the push rod 50 to move, and the push rod 50 moves on the inclined surface of the guide block 49, so that the guide block 49 guides the position of the active conical friction wheel 45. When the winding diameter on the reel 26 decreases, the diameter of the contact section between the active conical friction wheel 45 and the driven conical friction wheel 43 increases.The rotation speed of the driven conical friction wheel 43 increases, and the rotation speed of the roll 26 increases at the same time. As the winding diameter of the roll 26 gradually decreases, the rotation speed of the driven conical friction wheel 43 changes continuously, so that the roll 26 always discharges the material evenly, thereby facilitating the thermal print head 13 to print.

[0041] A paper feed end plane 21 is provided at the upper end of the printer body 11, and a paper discharge end plane 22 is provided at the lower part of the printer body 11. The vertical working angle of the paper feed end plane 21 is 0 to 90 degrees, preferably 30 to 60 degrees, and the horizontal working angle of the paper discharge end plane 22 is 0 to 90 degrees, preferably 30 to 60 degrees. The angle between the paper feed end plane 21 and the paper discharge end plane 22 is 90 to 180 degrees, preferably 180 degrees. When in use, the paper feed end plane 21 is arranged at the upper end of the printer body 11, so that the printing paper is conveniently put in, and the paper discharge end plane 22 is arranged at the lower part of the printer body 11, so that the printing content is conveniently checked. At the same time, the angle between the paper feed end plane 21 and the paper discharge end plane 22 is preferably 180 degrees, which can reduce the resistance of the printing paper discharge.

[0042] Example 2

[0043] The difference from Example 1 is that a button controller 53 is fixedly provided on one side of the support frame plate 28, and an extrusion frame is fixedly provided at the position corresponding to the position of the rotating frame and the button controller 53. The button controller 53 is electrically connected to the printer body 11. When in use, when the winding diameter on the roll 26 decreases, the rotating frame drives the extrusion frame to move. When the printing roll paper on the roll 26 is used up, the extrusion frame squeezes the button controller 53, causing the printer body 11 to issue an alarm, thereby reminding the staff to replace the roll 26.

[0044] The above embodiment discloses a printer with a replaceable print head, wherein when the printing paper roll is installed, the roll roller 27 is taken out from the installation box 23, and then one end of the roll roller 27 is sleeved on the inner side of the roll 26 with the printing paper wound thereon, and then the rotating shafts at both ends of the roll roller 27 are aligned with the positions of the two support frame plates 28, and the second limit frame 29 is pulled to rotate the two ends of the roll roller 27 to move to the inner side of the open end of the support frame plate 28, and at the same time, one end of the push rod 33 contacts the inclined surface of the guide rod 34, so that the guide rod 34 guides the push rod 33, so that the push rod 33 is connected to the connecting rod 3 The stopper slider 31 is pushed to move, and the outer side of the stopper slider 31 is tightly attached to the inner side of the roll 26, thereby fixing the roll 26. When the roll roller 27 is installed, the second limit frame 29 is released, and the second limit frame 29 can fix the rotation axis of one end of the roll roller 27. Then, the installation rotating plate 56 is opened to make the limit roller 55 away from the first guide roller 54, so that one end of the printing roll passes through the second guide roller, the first guide roller 54, and the paper feed end plane 21 at the upper end of the printer body 11, and then one end of the roll paper moves out through the paper discharge end plane 22, and then the installation rotating plate 56 is closed. The limiting roller 55 limits the position of the roll paper. When printing, the motor 48 drives the roll 26 to rotate through the active conical friction wheel 45, the driven conical friction wheel 43, the second gear 41, the first gear 40, the worm 39 and the worm wheel 38. The roll 26 can unfold the printing roll paper so that printing can be performed. As the printing roll paper on the roll 26 is used, the winding diameter of the roll 26 is reduced. Under the action of the spring telescopic rod 52, the pressing roller 51 is always in close contact with the printing roll paper on the roll 26. When the pressing roller 51 follows the change in the winding diameter of the roll 26, the rotating frame drives The push rod 50 moves, and the push rod 50 moves on the inclined surface of the guide block 49, so that the guide block 49 guides the position of the active conical friction wheel 45. When the winding diameter on the roll 26 decreases, the diameter of the contact section between the active conical friction wheel 45 and the driven conical friction wheel 43 increases, so that the rotation speed of the driven conical friction wheel 43 increases, and the rotation speed of the roll 26 increases at the same time. As the winding diameter of the roll 26 gradually decreases, the rotation speed of the driven conical friction wheel 43 changes continuously, so that the roll 26 is always evenly discharged, so that the thermal print head 13 is convenient for printing;

[0045] When the winding diameter of the roll 26 decreases, the rotating frame drives the squeezing frame to move. When the printing roll paper on the roll 26 is used up, the squeezing frame squeezes the button controller 53, so that the printer body 11 sends out an alarm, thereby reminding the staff to replace the roll 26.

[0046] When the thermal print head 13 needs to be replaced, the push rod pushes the first limit frame 18 to move, so that one end of the first limit frame 18 is away from the lock 17, thereby removing the print head housing 12, and then installing and using the print head housing 12 with the intact thermal print head 13 installed, so that the print head housing 12 as a whole and the thermal print head 13 are replaced, and then the spring pin 14 is aligned with the spring pin hole on the spring pin seat 15, so that the spring pin 14 is inserted into the spring pin hole, so that the thermal print head 13 is electrically connected to the printer body 11, and at the same time the first limit frame 18 cooperates with the lock 17 to fix the print head housing 12.

[0047] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A printer with a replaceable print head, comprising a printer body (11) and a print head housing (12), wherein the printer body (11) is provided with a spring needle seat (15) and a locking seat (16), characterized in that: The bottom end of the print head housing (12) is provided with an elastic needle (14) for use with the elastic needle seat (15); the locking seat (16) is provided with a fixing assembly for fixing the print head housing (12); the print head housing (12) is provided with a thermal print head (13); one side of the printer body (11) is provided with a first connector (24); the first connector (24) is electrically connected to a second connector (25); the second connector (25) is fixed to one side of the installation box (23); the installation box (23) is provided with a reel (26); the reel (26) is sleeved with a reel roller (27); the printer body (11) is provided with a reel roller (27) on the inside. A guide assembly for guiding the printing material is provided at the end, a plurality of sliding grooves are provided at equal intervals on the reel roller (27), and stop sliders (31) are slidably provided in the sliding grooves. A pushing mechanism for pushing the plurality of stop sliders (31) to move is provided inside the reel roller (27), a pressing roller (51) is closely provided on one side of the reel (26), and the pressing roller (51) is rotatably provided on the inner side of the rotating frame, and one side of the rotating frame is respectively fixedly connected to the output ends of a plurality of spring telescopic rods (52), and the spring telescopic rods (52) are provided in the mounting holes on one side of the mounting box (23), and a driving mechanism for driving the reel (26) to discharge the material evenly is provided inside the mounting box (23).

2. The printer with replaceable print head according to claim 1, characterized in that: The fixing assembly comprises two symmetrically arranged first limit frames (18), both of which are slidably arranged inside the printer body (11); an installation groove is provided at the upper end of the locking seat (16) corresponding to the position of one end of the first limit frame (18); a connecting plate is provided between the two first limit frames (18); a pressing rod is provided on one side of the connecting plate; a first return spring (19) is provided between one end of the pressing rod and the inside of the printer body (11); a baffle (20) is provided on one side of the printer body (11) and at one end of the pressing rod; and a lock buckle (17) is symmetrically provided at the bottom end of the print head housing (12) corresponding to the position of the first limit frame (18).

3. The printer with replaceable print head according to claim 1, characterized in that: The guide assembly comprises a first guide roller (54) and a mounting rotating plate (56), wherein the two first guide rollers (54) are symmetrically rotatably arranged on the upper end of the printer body (11), and the two mounting rotating plates (56) are symmetrically rotatably arranged on the upper end of the printer body (11), and the inner side of the mounting rotating plate (56) is symmetrically rotatably provided with a limiting roller (55), and the limiting roller (55) is aligned with the mounting position of the first guide roller (54), and a second guide roller is rotatably arranged inside the mounting box (23), and a plurality of fixed blocks are fixedly arranged on one side of the printer body (11), and a sleeve pipe is fixedly arranged at a position corresponding to the position of the fixed block on one side of the mounting box (23), and the sleeve pipe is sleeve-connected with the fixed block, and the sleeve pipe and the fixed block are fixedly connected by screws.

4. The printer with replaceable print head according to claim 3, characterized in that: An extension plate is fixedly provided on one side of one of the mounting rotating plates (56), a magnet is fixedly provided on the bottom end of the extension plate, and a mounting groove is provided on the other mounting rotating plate (56), an adsorption iron plate is provided in the mounting groove.

5. The printer with replaceable print head according to claim 1, characterized in that: The pushing mechanism comprises a connecting rod (32), one side of the stop slider (31) is hingedly provided with a connecting rod (32), the other ends of a plurality of the connecting rods (32) are hingedly connected to one end of a push rod (33), a second tension spring is provided between one end of the push rod (33) and the inside of the winding roller (27), one end of the push rod (33) is closely provided with a guide rod (34), one end of the guide rod (34) is inclined, and the guide rod (34) is fixedly arranged at the bottom of the installation box (23). The push rod (33) is provided with a first ball bearing at one end, and limit grooves are provided on both sides of the stop slider (31). Guide groove rods are slidably provided in the limit grooves, and the guide groove rods are fixedly arranged inside the reel roller (27). Support frame plates (28) are rotatably provided at both ends of the reel roller (27), and the support frame plates (28) are fixedly arranged inside the installation box (23). A limit assembly for fixing the reel roller (27) is provided on one of the support frame plates (28).

6. The printer with replaceable print head according to claim 5, characterized in that: The limiting assembly comprises a second limiting frame (29), a connection box is fixedly provided on a support frame plate (28), a second limiting frame (29) is slidably provided inside the connection box, a second return spring (30) is provided between one side of the second limiting frame (29) and one side inside the installation box, and one end of the second limiting frame (29) extends to the inner side of the opening end of the support frame plate (28).

7. The printer with replaceable print head according to claim 6, characterized in that: The driving mechanism comprises a second transmission disc (36), the second transmission disc (36) being fixedly arranged on a rotating shaft at one end of the winding roller (27), a first transmission disc (35) being matched with one side of the second transmission disc (36), the first transmission disc (35) being fixedly arranged on one end of a transmission shaft (37), the transmission shaft (37) being rotatably arranged inside the installation box (23), a worm wheel (38) being fixedly arranged on the transmission shaft (37), a worm (39) being meshed on the worm wheel (38), first rotating plates being rotatably arranged at both ends of the worm (39), and the first rotating plates being fixedly arranged on the installation box (23). Inside, a first gear (40) is fixedly provided on a rotating shaft at one end of the worm (39), a second gear (41) is meshed with the first gear (40), the second gear (41) is fixedly provided on one end of the fixed shaft, a plurality of second rotating plates are rotatably provided on the fixed shaft, the second rotating plates are all fixedly provided on the bottom end of the installation box (23), a first external spline shaft is fixedly provided on one end of the fixed shaft, a first internal spline shaft (42) is slidably provided on the first external spline shaft, the first internal spline shaft (42) is connected to the first external spline shaft by spline matching, the first internal spline shaft (42) is connected to the first external spline shaft by spline matching, A third return spring (44) is provided between one end and the other end of the key shaft; a driven conical friction wheel (43) is fixedly provided at one end of the first internal spline shaft (42); an active conical friction wheel (45) is frictionally and tightly provided on the driven conical friction wheel (43); the active conical friction wheel (45) is fixedly provided on the second internal spline shaft (47); the second internal spline shaft (47) is slidably provided on the second external spline shaft; the second external spline shaft and the second internal spline shaft (47) are connected by spline fitting; a tension spring (46) is provided between one end of the second external spline shaft and one end of the second internal spline shaft (47); The end is fixedly connected to the output end of the motor (48), the motor (48) is fixedly arranged at the bottom end inside the installation box (23), a third rotating plate is rotatably arranged on the second internal spline shaft (47), the third rotating plate is fixedly arranged at the bottom end of the sliding plate, both ends of the sliding plate are slidably provided with sliding frames, the sliding frames are fixedly arranged at the bottom end inside the installation box (23), a guide block (49) is fixedly arranged on one side of the sliding plate, a push rod (50) is tightly arranged at the inclined surface of the guide block (49), the push rod (50) is fixedly arranged on one side of the rotating frame, and the motor (48) is electrically connected to the printer body (11).

8. The printer with replaceable print head according to claim 1, characterized in that: A paper feed end plane (21) is provided at the upper end of the printer body (11), and a paper discharge end plane (22) is provided at the lower part of the printer body (11); the vertical working angle of the paper feed end plane (21) is 0 to 90 degrees, the horizontal working angle of the paper discharge end plane (22) is 0 to 90 degrees, and the included angle between the paper feed end plane (21) and the paper discharge end plane (22) is 90 to 180 degrees.

9. The printer with replaceable print head according to claim 5, characterized in that: A button controller (53) is fixedly provided on one side of the support frame plate (28), and an extrusion frame is fixedly provided at a position corresponding to the position of the rotating frame and the button controller (53), and the button controller (53) is electrically connected to the printer body (11).

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