Pressure and positioning self-adaptive mechanism for printing head of thermal printer

Abstract

The utility model relates to the technical field of printers, in particular to a printing head pressure and positioning self-adaptive mechanism of a thermal printer, which comprises an upper cover, an upper cover screw, a printing head bracket assembly, a lock catch assembly, a bottom cover, a bottom cover screw and a pressure spring, the printing head support assembly comprises a printing head, a printing head support, a cutter, a cutter fixing frame and a positioning screw, a plurality of cylindrical bosses are arranged on the central flange of the cutter support, the cutter is arranged in front of the cutter fixing frame, a bottom cover screw penetrates through a bottom cover screw hole to be in threaded connection with an upper cover, positioning pins are arranged on the two sides of the front end of the upper cover respectively, and a round hole is formed in the surface of the side wall of the upper cover. The upper cover screw penetrates through the through hole to be in threaded connection with the cutter fixing frame, the two compressed springs are arranged on the corresponding spring positioning protrusions in a sleeving mode respectively, the printing head is detachably connected with the printing head support, through the arrangement of the structure, the positioning accuracy of the printing head heating wire and the printing rubber roller is improved, and printing lists on the left side and the right side are made to be consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a pressure and positioning adaptive mechanism for a print head of a thermal printer. Background Art

[0002] With the continuous development of my country's economy, the commercial, retail, medical, communication, logistics and other industries need to use a large number of label and ticket thermal printers, and the use of thermal printers will become wider and wider. The print head of a thermal printer is bar-shaped, and the heating line is a line. When printing, the print head presses on the printing roller. The heating line is parallel to the printing roller axis and is located on the tangent line between the print head and the printing roller. It is also required that the pressure of the entire heating line and the printing roller be balanced, which places high requirements on manufacturing precision.

[0003] In order to ensure the pressure and position accuracy of the print head heating wire and rubber roller, the existing thermal printer technology basically relies on increasing the accuracy of parts or manual adjustment in the later stage. This not only increases costs and reduces production efficiency, but also often causes uneven pressure at both ends of the print head due to parts accuracy problems, inaccurate positioning of the print head heating wire and print rubber roller, resulting in inconsistent printed lists on the left and right sides. Utility Model Content

[0004] The utility model aims to provide a thermal printer print head pressure and positioning adaptive mechanism which has a simple and compact structure, is easy to process parts and is quick to install.

[0005] To achieve the above-mentioned purpose, the utility model provides a thermal printer print head pressure and positioning adaptive mechanism, including an upper cover, an upper cover screw, a print head bracket assembly, a locking assembly, a bottom cover, a bottom cover screw and a compression spring, the front end of the top surface of the upper cover is provided with a plurality of through holes, the through holes are adapted to the upper cover screws, the rear end of the upper cover is downwardly provided with head and bottom cover screw holes, the two sides of the rear end of the upper cover are respectively provided with side holes, the print head bracket assembly includes a print head, a print head bracket, a cutter, a cutter fixing bracket and a positioning screw, side walls are respectively provided at both ends of the cutter fixing bracket, the cutter is provided in front of the cutter fixing bracket, the positioning screw passes through the cutter and is threadedly connected to the cutter fixing bracket, the print head bracket is fixedly connected to the bottom of the cutter fixing bracket, the rear end of the print head bracket is provided with a central flange of the print head bracket, the print head bracket A center hole is provided on the central flange of the print head bracket, a plurality of countersunk holes are provided on the surface of the bottom cover, the bottom cover is arranged below the upper cover, the bottom cover screw passes through the bottom cover screw hole and is threadedly connected to the upper cover, and is located inside the countersunk hole, positioning pins are respectively provided on both sides of the front end of the upper cover, and a circular hole is provided on the surface of the side wall, the positioning pin is slidably connected to the cutter fixing bracket and passes through the corresponding circular hole, a plurality of positioning screw holes are provided on the upper part of the cutter fixing bracket, the upper cover screw passes through the through hole and is threadedly connected to the cutter fixing bracket, and is located inside the positioning screw hole, two spring positioning protrusions are symmetrically provided on the upper part of the print head bracket, the two compression springs are respectively sleeved on the corresponding spring positioning protrusions, the print head is detachably connected to the print head bracket, and is located below the print head bracket.

[0006] Wherein, limiting edges are respectively arranged on both sides of the lower end of the cutter fixing bracket, a central protrusion is arranged on the front lower end of the cutter fixing bracket, a cutter bracket central flange is arranged in the center of the rear end of the cutter fixing bracket, and a plurality of cylindrical bosses are arranged on the central flange of the cutter bracket, buckle ears are arranged on both sides of the print head bracket, and a lower limit block is arranged on each of the buckle ears, and upper limit blocks are respectively arranged on both sides of the front end of the print head bracket, and two protruding blocks are arranged at the front end of the print head bracket, the cylindrical boss is slidably connected with the central flange of the print head bracket and passes through the center hole, the limiting edge is slidably connected with the upper limit block and the lower limit block, and is located between the upper limit block and the lower limit block, and the central protrusion is arranged between the two protruding blocks.

[0007] The central flange of the print head support is bent vertically upward, the buckle ear is bent vertically downward, the central flange of the cutter support is bent downward, and the side wall is bent vertically forward.

[0008] Wherein, the lock buckle assembly includes a limiting shaft, two lock buckles, a large torsion spring, a small torsion spring and a plurality of retaining rings, two ends of the limiting shaft are symmetrically provided with planes and a first retaining ring groove and a second retaining ring groove, the two second retaining ring grooves are arranged between the two first retaining ring grooves, the middle section of the lock buckle is provided with a D-shaped hole, the upper end of the lock buckle is provided with a handle, the lower end of the lock buckle is provided with a hook, a positioning block is provided between the D-shaped hole and the hook, the lock buckle passes through the D-shaped hole and is sleeved on the two ends of the limiting shaft, the two ends of the large torsion spring are provided with spiral coils, the two spiral coils are provided with large torsion spring swing arms, the outer sides of the two spiral coils are provided with large torsion spring side rods, and the two A large torsion spring crossbeam is fixedly connected between the large torsion spring side rods, and the large torsion spring crossbeam and the two large torsion spring side rods are arranged in a U shape. The two spiral coils are slidably connected to the limit shaft and are sleeved on both ends of the limit shaft. Two small torsion spring stop arms are arranged at both ends of the small torsion spring. The two small torsion springs are slidably connected to the limit shaft and are located between the bent hook and the corresponding second stop ring. The two second stop rings are respectively arranged on the inner side of the corresponding upper cover. The limit shaft is rotatably connected to the upper cover and is located inside the corresponding side hole. The corresponding small torsion spring swing arm is clamped with the handle, and the corresponding small torsion spring is in contact with the upper cover.

[0009] Wherein, a circular arc groove is arranged on the surface of each buckle ear, and the circular arc groove is adapted to the limiting sleeve of the printing rubber roller.

[0010] The top of the bottom cover is in contact with the large torsion spring side rod, a U-shaped groove is provided on the surface of the upper cover, and the large torsion spring side rod is provided inside the U-shaped groove.

[0011] The utility model discloses a thermal printer print head pressure and positioning adaptive mechanism, one end of the positioning pin passes through the cutter fixing frame, so that the positioning pin and the printer bracket are rotatably matched, and the installation is quick and convenient; the upper cover, the bottom cover and the print head bracket are connected by the bottom cover screws and the positioning screws respectively, the installation is simple, and the parts manufacturing cost is low; the larger than the head is suitable for work, and the central protrusion is stuck between the two protrusion blocks, which can effectively prevent the print head bracket from swinging, and can effectively solve the problem that the print head is not parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1This is a schematic diagram of the actual use and installation of the utility model.

[0014] Figure 2 This is an exploded view of the utility model.

[0015] Figure 3 This is a front lower oblique view of the print head support assembly of the utility model.

[0016] Figure 4 This is a rear upper oblique view of the print head support assembly of the utility model.

[0017] Figure 5 It is an exploded view of the print head support assembly of the utility model.

[0018] Figure 6 This is an exploded view of the lock assembly of the utility model.

[0019] Figure 7 This is a conceptual diagram of the assembly of the utility model on a complete printer.

[0020] 1-upper cover, 1a-through hole, 1b-side hole, 1c-bottom cover screw hole, 1d-U-shaped groove, 1f-positioning pin, 2-print head bracket assembly, 201-cutter fixing bracket, 201a-side wall, 201b-round hole, 201c-middle protrusion, 201d-limiting edge, 201e-center flange of cutter bracket, 201f-cylindrical boss, 201g-positioning screw hole, 202-cutter, 203-positioning screw, 204-print head bracket, 204a-protrusion block, 204b-buckle ear, 204c-arc groove, 204d-lower limit block, 204e-upper limit block, 204f-spring positioning protrusion, 20 4g-central flange of print head bracket, 204h-center hole, 205-print head, 206 compression spring, 3 locking assembly, 301-limiting shaft, 301a plane, 301b-first retaining ring groove, 301c-second retaining ring groove, 302 locking buckle, 302a-handle, 302b-D-shaped hole, 302c-bend hook, 303 first retaining ring, 304 small torsion spring, 304a-small torsion spring retaining arm, 305-second retaining ring, 306-large torsion spring, 306a-screw, 306b-large torsion spring side rod, 306c-large torsion spring beam, 4-bottom cover, 401-countersunk hole, 5-upper cover screw, 6-bottom cover screw, 7-print rubber roller. DETAILED DESCRIPTION

[0021] 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] See also Figures 1 to 7 The utility model provides a thermal printer print head 205 pressure and positioning adaptive mechanism, including an upper cover 1, an upper cover screw 5, a print head bracket assembly 2, a locking assembly 3, a bottom cover 4, a bottom cover screw 6 and a compression spring 206. The front end of the top surface of the upper cover 1 is provided with a plurality of through holes 1a, and the through holes 1a are adapted to the upper cover screw 5. The rear end of the upper cover 1 is downwardly provided with a head bottom cover screw hole 1c, and the two sides of the rear end of the upper cover 1 are respectively provided with side holes 1b. The print head bracket assembly 2 includes a print head 205, a print head bracket 204, a cutter 202, a cutter fixing frame 201 and a positioning screw 203, wherein the cutter fixing frame 201 is provided with side walls 201a at both ends, the cutter 202 is provided in front of the cutter fixing frame 201, the positioning screw 203 passes through the cutter 202 and is threadedly connected to the cutter fixing frame 201, the print head bracket 204 is fixedly connected to the bottom of the cutter fixing frame 201, and the rear end of the print head bracket 204 is provided with a print head bracket central flange 204g, the print head bracket central flange A center hole 204h is provided on the edge 204g, a plurality of countersunk holes 401 are provided on the surface of the bottom cover 4, the bottom cover 4 is arranged below the upper cover 1, the bottom cover screw 6 passes through the bottom cover screw hole 1c and is connected to the countersunk hole 401, and is located inside the threaded hole of the upper cover 1, and positioning pins 1f are respectively provided on both sides of the front end of the upper cover 1, and a circular hole 201b is provided on the surface of the side wall 201a, the positioning pin 1f is slidably connected to the cutter fixing frame 201, and passes through the corresponding circular hole 201b, the A plurality of positioning screw holes 201g are provided on the upper portion of the cutter fixing bracket 201, the upper cover screw 5 passes through the through hole 1a and is threadedly connected to the cutter fixing bracket 201, and is located inside the positioning screw hole 201g, two spring positioning protrusions 204f are symmetrically provided on the upper portion of the print head bracket 204, the two compression springs 206 are respectively sleeved on the corresponding spring positioning protrusions 204f, the print head 205 is detachably connected to the print head bracket 204, and is located below the print head bracket 204.

[0023] In this embodiment, one end of the positioning pin 1f passes through the cutter fixing bracket 201, so that the positioning pin 1f and the printer bracket are rotatably matched, and the installation is quick and convenient. The upper cover 1, the bottom cover 4 and the print head bracket 204 are connected by the bottom cover screws 6 and the positioning screws 203 respectively. The installation is simple, the parts manufacturing cost is low, and the larger head is suitable for work.

[0024] Furthermore, the lower ends of the cutter fixing frame 201 are provided with limited edges 201d respectively, the front lower end of the cutter fixing frame 201 is provided with a central protrusion 201c, the rear end center of the cutter fixing frame 201 is provided with a cutter bracket central flange 201e, the cutter bracket central flange 201e is provided with a plurality of cylindrical bosses 201f, the print head bracket 204 is provided with buckle ears 204b on both sides, each buckle ear 204b is provided with a lower limit block 204d, and the print head bracket 204 is provided with a plurality of cylindrical bosses 201f. Upper limit blocks 204e are respectively provided on both sides of the front end, two protruding blocks 204a are provided at the front end of the print head bracket 204, the cylindrical boss 201f is slidably connected to the central flange 204g of the print head bracket and passes through the center hole 204h, the limiting edge 201d is slidably connected to the upper limit block 204e and the lower limit block 204d, and is located between the upper limit block 204e and the lower limit block 204d, and the central protrusion 201c is arranged between the two protruding blocks 204a.

[0025] In this embodiment, the central protrusion 201c is stuck between the two protrusion blocks 204a, which can effectively prevent the print head bracket 204 from swinging and effectively solve the problem that the print head 205 is not parallel.

[0026] Furthermore, the central flange 204g of the print head support is bent vertically upward, the buckle ear 204b is bent vertically downward, the central flange 201e of the cutter support is bent downward, and the side wall 201a is bent vertically forward.

[0027] In this embodiment, the arrangement of the central flange 204g of the print head support, the buckle ears 204b and the side walls 201a facilitates the fixing of the corresponding mechanisms and improves the stability.

[0028] Furthermore, the lock assembly 3 includes a limit shaft 301, two lock buckles 302, a large torsion spring 306, a small torsion spring 304 and a plurality of retaining rings, the two ends of the limit shaft 301 are symmetrically provided with a plane 301a and a first retaining ring 303 groove 301b and a second retaining ring 305 groove 301c, the two second retaining ring 305 grooves 301c are arranged between the two first retaining ring 303 grooves 301b, and the middle section of the lock buckle 302 is provided with a D-shaped hole 301a. 2b, the upper end of the lock buckle 302 is provided with a handle 302a, the lower end of the lock buckle 302 is provided with a hook 302c, a positioning block is provided between the D-shaped hole 302b and the hook 302c, the lock buckle 302 passes through the D-shaped hole 302b and is sleeved on both ends of the limit shaft 301, and the two ends of the large torsion spring 306 are provided with spiral coils 306a, and the two spiral coils 306a are provided with large torsion spring 306 swing arms, and the two spiral coils 3 A large torsion spring side rod 306b is arranged on the outer side of 06a, and a large torsion spring crossbeam 306c is fixedly connected between the two large torsion spring side rods 306b, and the large torsion spring crossbeam 306c and the two large torsion spring side rods 306b are arranged in a U shape, and the two spiral coils 306a are slidably connected with the limit shaft 301 and are sleeved on the two ends of the limit shaft 301, and two small torsion spring retaining arms 304a are arranged at both ends of the small torsion spring 304, and the two small torsion springs 304 are slidably connected with the limit shaft 301 and are located between the bent hook 302c and the corresponding second retaining ring 305, and the two second retaining rings 305 are respectively arranged on the inner sides of the corresponding upper covers 1, and the limit shaft 301 is rotatably connected with the upper cover 1 and is located inside the corresponding side hole 1b, and the corresponding small torsion spring 304 swing arm is clamped with the handle 302a, and the corresponding small torsion spring 304 is in contact with the upper cover 1.

[0029] In this embodiment, the limit shaft 301 is arranged in the side hole 1b corresponding to the upper cover 1, and the small torsion spring 304 hooks the handle 302a, so that the small torsion spring stop arm 304a is against the upper cover 1, and the preset torque of the small torsion spring 304 makes one end of the lock 302 turn to the direction of the print head 205, and the large torsion spring side rods 306b are respectively placed in the U-shaped groove 1d of the upper cover 1 to form a gap sliding fit, and the large torsion spring cross beam 306c can resist the paper, and produce a buffering effect on the paper when the printer accelerates the paper feeding, thereby avoiding the failure of overlapping printing content caused by paper slipping due to sudden tightening of the paper roll during accelerated paper feeding.

[0030] Furthermore, a circular arc groove 204 c is provided on the surface of each buckle ear 204 b, and the circular arc groove 204 c is sleeve-fitted with the limiting shaft 301 of the printing rubber roller 7 .

[0031] In this embodiment, the setting of the arc groove 204c can quickly clamp the limiting shaft 301 sleeve of the printing rubber roller 7, complete the rapid and accurate positioning of the print head support assembly 2 and the printing rubber roller 7, fully ensure the overall positioning accuracy of the print head 205 and the printing rubber roller 7, and solve the problem of precise positioning between modules.

[0032] Furthermore, the top of the bottom cover 4 contacts the large torsion spring side rod 306b, and a U-shaped groove 1d is provided on the surface of the upper cover 1, and the large torsion spring side rod 306b is provided inside the U-shaped groove 1d.

[0033] In this embodiment, the large torsion spring 306 is sleeved on the limiting shaft 301, and the large torsion spring side rod 306b is stuck in the U-shaped groove 1d, thereby improving stability.

[0034] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the utility model.

Claims

1. A thermal printer print head pressure and positioning adaptive mechanism, characterized in that: The invention comprises an upper cover, an upper cover screw, a print head support assembly, a locking assembly, a bottom cover, a bottom cover screw and a compression spring, wherein a plurality of through holes are arranged at the front end of the top surface of the upper cover, and the through holes are adapted to the upper cover screws, and a head and bottom cover screw hole is arranged downwardly at the rear end of the upper cover, and side holes are arranged on both sides of the rear end of the upper cover, respectively; the print head support assembly comprises a print head, a print head support, a cutter, a cutter fixing bracket and a positioning screw, and side walls are arranged at both ends of the cutter fixing bracket, respectively; the cutter is arranged in front of the cutter fixing bracket, and the positioning screw passes through the cutter and is threadedly connected to the cutter fixing bracket, the print head support is fixedly connected to the bottom of the cutter fixing bracket, a print head support central flange is arranged at the rear end of the print head support, and a center hole is arranged on the central flange of the print head support, and the A plurality of countersunk holes are provided on the surface of the bottom cover, and the bottom cover is provided below the upper cover, and the bottom cover screws are threadedly connected to the upper cover through the bottom cover screw holes and are located inside the countersunk holes, and positioning pins are respectively provided on both sides of the front end of the upper cover, and a circular hole is provided on the surface of the side wall, and the positioning pins are slidably connected to the cutter fixing bracket and pass through the corresponding circular hole, and a plurality of positioning screw holes are provided on the upper part of the cutter fixing bracket, and the upper cover screws are threadedly connected to the cutter fixing bracket through the through hole and are located inside the positioning screw hole, and two spring positioning protrusions are symmetrically provided on the upper part of the print head bracket, and the two compression springs are respectively sleeved on the corresponding spring positioning protrusions, and the print head is detachably connected to the print head bracket and is located below the print head bracket.

2. The thermal printer print head pressure and positioning adaptive mechanism as claimed in claim 1, characterized in that: Limiting edges are respectively arranged on both sides of the lower end of the cutter fixing bracket, a central protrusion is arranged on the front lower end of the cutter fixing bracket, a cutter bracket central flange is arranged at the center of the rear end of the cutter fixing bracket, and a plurality of cylindrical bosses are arranged on the central flange of the cutter bracket, buckle ears are arranged on both sides of the print head bracket, and a lower limit block is arranged on each of the buckle ears, and upper limit blocks are respectively arranged on both sides of the front end of the print head bracket, and two protruding blocks are arranged at the front end of the print head bracket, the cylindrical boss is slidably connected with the central flange of the print head bracket and passes through the center hole, the limiting edge is slidably connected with the upper limit block and the lower limit block, and is located between the upper limit block and the lower limit block, and the central protrusion is arranged between the two protruding blocks.

3. The thermal printer print head pressure and positioning adaptive mechanism as claimed in claim 2, characterized in that: The central flange of the print head support is bent vertically upward, the buckle ear is bent vertically downward, the central flange of the cutter support is bent downward, and the side wall is bent vertically forward.

4. The thermal printer print head pressure and positioning adaptive mechanism as claimed in claim 3, characterized in that: The lock buckle assembly includes a limiting shaft, two lock buckles, a large torsion spring, a small torsion spring and a plurality of retaining rings, two ends of the limiting shaft are symmetrically provided with planes and a first retaining ring groove and a second retaining ring groove, the two second retaining ring grooves are arranged between the two first retaining ring grooves, the middle section of the lock buckle is provided with a D-shaped hole, the upper end of the lock buckle is provided with a handle, the lower end of the lock buckle is provided with a hook, a positioning block is provided between the D-shaped hole and the hook, the lock buckle passes through the D-shaped hole and is sleeved on the two ends of the limiting shaft, the two ends of the large torsion spring are provided with spiral coils, the two spiral coils are provided with large torsion spring swing arms, the outer sides of the two spiral coils are provided with large torsion spring side rods, and the two A large torsion spring crossbeam is fixedly connected between the large torsion spring side rods, and the large torsion spring crossbeam and the two large torsion spring side rods are arranged in a U shape. The two spiral coils are slidably connected to the limit shaft and are sleeved on both ends of the limit shaft. Two small torsion spring stop arms are arranged at both ends of the small torsion spring. The two small torsion springs are slidably connected to the limit shaft and are located between the bent hook and the corresponding second stop ring. The two second stop rings are respectively arranged on the inner sides of the corresponding upper covers. The limit shaft is rotatably connected to the upper cover and is located inside the corresponding side hole. The corresponding small torsion spring swing arm is clamped with the handle, and the corresponding small torsion spring is in contact with the upper cover.

5. The thermal printer print head pressure and positioning adaptive mechanism as claimed in claim 4, characterized in that: The surface of each buckle ear is provided with an arc groove, and the arc groove is adapted to the limiting shaft sleeve of the printing rubber roller.

6. The thermal printer print head pressure and positioning adaptive mechanism as claimed in claim 5, characterized in that: The top of the bottom cover contacts the large torsion spring side rod, the surface of the upper cover is provided with a U-shaped groove, and the large torsion spring side rod is arranged inside the U-shaped groove.

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