A label printer with self-adjusting function

Abstract

This invention belongs to the technical field of label printing equipment, and specifically relates to a label printer with a self-adjusting function, comprising an upper casing and a lower casing. A drive rod is rotatably mounted on the front side of the interior of the lower casing. A push roller sleeve is fitted onto the rod wall of the drive rod. A top plate is provided inside the lower casing to cooperate with the push roller sleeve. A moving gear is fitted onto the rod wall of the drive rod. A stationary gear meshes with the moving gear and rotates on the inner wall of the lower casing. This invention can reduce the waste of ribbon consumables through adaptive adjustment when the thermal transfer printhead is powered on. It can also utilize recycled release paper, combined with an adhesive pad for on-site adhesive application of the label paper, changing the traditional label paper roll design. There is no consumption of the release paper substrate. Combined with the design that reduces ribbon consumption, it can reduce the frequency of changing label paper rolls and ribbons during printing. It is convenient to use and has a compact and aesthetically pleasing overall design.

Description

Technical Field

[0001] This invention belongs to the technical field of label printing equipment, and in particular relates to a label printer with self-adjusting function. Background Technology

[0002] Various types of labels are needed in many places such as offices, factories, warehouses, and shopping malls, such as price tags, memo labels, and product information labels. Because these labels are small, they are usually printed using specialized label printers.

[0003] Thermal transfer printers are the most common label printing devices. They use a specialized printhead to heat and pressurize the printhead, transferring the toner from the ribbon onto the label paper. During printing, the device uses a miniature motor with gears or two miniature motors to drive the label paper and ribbon for printing. Regardless of the method, the ribbon and label paper must move synchronously to ensure synchronized printing. Common label paper rolls are typically shown in the attached image. Figure 1 As shown in the figure (a is the release paper base, b is the label paper, c is the set printing area, and d is the distance between two adjacent printing areas), after printing in one printing area, when the label paper roll and the ribbon continue to move synchronously, since part d is the printing interval, if the ribbon and label paper move synchronously at this time, it will cause the ribbon to waste part d of its length. Over time, this will lead to a large consumption of ribbon material. Although driving the ribbon with two motors separately can solve this problem to some extent, the motor speed driving the ribbon needs to be reset when printing printing areas of different sizes. On the one hand, setting a suitable motor speed is relatively complicated, and on the other hand, due to the ribbon tension, the printed area of ​​the ribbon may not be delivered in time, resulting in the incomplete printing of the head of the next label. Therefore, we propose a label printer with a self-adjusting function to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a label printer with a self-adjusting function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A label printer with self-adjusting function, comprising an upper casing and a lower casing, wherein a drive rod is rotatably provided on the front side of the interior of the lower casing, a push roller sleeve is fitted on the rod wall of the drive rod, a top plate is provided inside the lower casing to cooperate with the push roller sleeve, a moving gear is fitted on the rod wall of the drive rod, a stationary gear is rotatably provided on the inner wall of the lower casing to mesh with the moving gear, two side plates are integrally provided at the lower end of the upper casing, the two side plates are rotatably connected to a rotating shaft, a carbon ribbon take-up roller is fixedly fitted on the shaft wall of the rotating shaft, the rotating shaft and the stationary gear are connected to a transmission mechanism, and a transmission mechanism is provided on the upper inner wall of the upper casing on one side of the carbon ribbon take-up roller. The base has a thermal transfer printhead assembly connected to a transmission mechanism at its lower part. A pressure mechanism is also provided inside the base. The transmission mechanism is connected to the thermal transfer printhead assembly via the pressure mechanism. Pressure rollers are rotatably connected to both side walls of the thermal transfer printhead assembly. A transfer support is provided at the lower housing. Two fixing plates are located on the upper inner wall of the upper housing, on one side of the base. A ribbon mounting plate is rotatably mounted on the side walls of both fixing plates. A glue application mechanism is provided inside the lower housing. A discharge port is shared between the upper and lower housings. A machine cover is fixed to the outer side wall of the lower housing. A gear reduction drive assembly connected to a drive rod is located inside the machine cover.

[0006] Preferably, the transmission mechanism includes a friction iron disc disposed on one side of the stationary gear, a transmission block disposed on one side of the friction iron disc, a groove formed on the side wall of the transmission block, an electromagnet fixedly disposed at the bottom of the groove, and a conductive component connected to the electromagnet and the thermal transfer printhead assembly, and an elastic reset component connected to the friction iron disc and the stationary gear.

[0007] Preferably, the pressurizing mechanism includes a circular groove inside the base, a first rubber piston slidably disposed inside the circular groove, a first spring being disposed between the first rubber piston and the bottom of the circular groove, a connecting rod being fixed between the first rubber piston and the thermal transfer printhead assembly, an air chamber being disposed inside the base above the circular groove, and a vent hole being disposed between the air chamber and the circular groove, a second rubber piston being disposed inside the air chamber, and a top rod being fixed to the end face of the second rubber piston and slidably connected to the wall of the air chamber, a pressure plate being fixed to the rod end of the top rod, and the plate end of the pressure plate being disposed on the eccentric side of the friction iron disc.

[0008] Preferably, the glue coating mechanism includes a connecting roller rotatably disposed inside the lower housing, a strip plate fixedly disposed on the outer side wall of the lower housing, and paper passage holes opened on the side walls of both the lower housing and the transfer platform. The connecting roller is connected to release paper by pushing the glue roller sleeve, the strip plate and the paper passage holes together. A label storage frame is inserted into the upper end of the upper housing. Two slot plates are fixedly disposed inside the lower housing. A glue injection tube is inserted between the two slot plates on the side wall of the lower housing. Three sprockets are arranged in a triangular pattern inside the lower housing, and the three sprockets are connected to a chain for transmission. A glue coating cloth pad is fixedly sleeved on the side wall of the chain.

[0009] Preferably, the conductive component includes a conductive rod fixedly inserted into the shaft wall and connected to an electromagnet; a conductive slip ring is fixedly provided on the side wall of the side plate and slidably connected to the conductive rod; the conductive slip ring is connected to the thermal transfer printhead assembly; and both the shaft and the side plate are made of insulating material.

[0010] Preferably, the elastic reset assembly includes multiple slide rods fixedly inserted into the side wall of the stationary gear, the rod wall of each slide rod being slidably connected to the side wall of the friction iron disc, and multiple second springs being fixedly provided between the friction iron disc and the stationary gear.

[0011] Preferably, the side wall of the friction iron disc is integrally provided with a compensation block, and the compensation block is fitted with a rubber sleeve that is interference-fitted with the groove wall.

[0012] Preferably, a separation plate is fixedly provided inside the lower housing between the adhesive pad and the release paper, and a transfer roller is rotatably provided inside the lower housing. The transfer roller and the axle of the sprocket on the same side are connected by a belt drive assembly. A limiting roller is rotatably provided inside the lower housing above the release paper.

[0013] Compared to existing technologies, the advantages of a self-adjusting label printer are:

[0014] 1. The upper and lower housings, drive rod, and push roller sleeve are used to move the label paper by friction. Through the coordinated operation of the top plate, moving gear, stationary gear, side plate, rotating shaft, ribbon take-up roller, transmission mechanism, thermal transfer printhead assembly, transfer platform, fixing plate, ribbon mounting plate, machine cover, and gear reduction drive assembly, the thermal transfer printhead assembly is automatically triggered when the printing section is synchronously powered, causing the ribbon take-up roller to move the ribbon and label paper synchronously. This ensures the synchronous and normal operation of the label thermal transfer, guaranteeing label printing quality. Furthermore, after printing in one section, the ribbon stops moving when the label paper continues to move. This design reduces ribbon consumption and waste; that is, through the adaptive control of the thermal transfer printhead, ribbon consumables waste can be reduced.

[0015] 2. The built-in pressurizing mechanism can synchronize with the label paper drive and the ribbon drive, so that the thermal transfer print head applies pressure to the ribbon to ensure clear printing. When the label paper moves alone, the label paper will not be affected by the ribbon due to the pressure applied to the ribbon by the thermal transfer print head.

[0016] 3. The glue-applying mechanism allows for on-site glue application of the label paper using recycled release paper and a glue-applying pad. This changes the traditional label paper roll design, avoiding the consumption of release paper. This, combined with reduced ribbon consumption, reduces the frequency of label paper roll and ribbon changes during printing. As long as the ribbon is not completely used up, there is no need to stop the machine; simply add an appropriate amount of label paper. It is convenient to use and has a compact and aesthetically pleasing design. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connection structure between label paper and release paper base tape in the existing technology;

[0018] Figure 2 This is a three-dimensional structural diagram of a label printer with self-adjusting function provided by the present invention;

[0019] Figure 3 This is a schematic diagram of the transmission mechanism of a label printer with self-adjusting function provided by the present invention;

[0020] Figure 4 This is a schematic diagram of the adhesive application mechanism of a label printer with self-adjusting function provided by the present invention;

[0021] Figure 5 This is an enlarged view of part A of a label printer with self-adjusting function provided by the present invention;

[0022] Figure 6 This is a front view schematic diagram of the pressure mechanism of a label printer with self-adjusting function provided by the present invention;

[0023] Figure 7 This is a top view schematic diagram of the pressure mechanism of a label printer with self-adjusting function provided by the present invention;

[0024] Figure 8 This is a schematic diagram of the transmission structure between the transfer roller and the sprocket of a label printer with self-adjusting function provided by the present invention.

[0025] In the diagram: 1. Upper housing; 2. Lower housing; 3. Drive rod; 4. Push roller sleeve; 5. Top plate; 6. Moving gear; 7. Stationary gear; 8. Side plate; 9. Shaft; 10. Carbon ribbon take-up roller; 11. Transmission mechanism; 111. Friction iron disc; 112. Transmission block; 113. Groove; 114. Electromagnet; 115. Conductive component; 1151. Conductive rod; 1152. Conductive slip ring; 116. Elastic reset component; 1161. Slide rod; 1162. Second spring; 12. Base; 13. Thermal transfer printhead assembly; 14. Pressurization mechanism; 141. Circular groove; 142. First rubber piston; 143. First spring; 144. Connecting... 145. Connecting rod; 146. Air chamber; 147. Vent hole; 148. Second rubber piston; 149. Top rod; 140. Pressure plate; 15. Transfer platform; 16. Fixing plate; 17. Carbon ribbon mounting plate; 18. Glue coating mechanism; 181. Connecting roller; 182. Strip plate; 183. Release paper; 184. Label storage frame; 185. Slot plate; 186. Glue injection tube; 187. Sprocket; 188. Chain; 189. Glue coating cloth pad; 19. Discharge port; 20. Machine cover; 21. Gear reduction drive assembly; 22. Compensating block; 23. Rubber sleeve; 24. Separation plate; 25. Transfer roller; 26. Belt drive assembly; 27. Limiting roller; 28. Pressure roller. Detailed Implementation

[0026] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0027] like Figure 1-8 As shown, a label printer with a self-adjusting function includes an upper housing 1 and a lower housing 2, which are hinged together. A drive rod 3 is rotatably mounted on the front side of the lower housing 2. A push roller sleeve 4 is fitted onto the rod wall of the drive rod 3. A top plate 5, which cooperates with the push roller sleeve 4, is located inside the lower housing 2. A moving gear 6 is fitted onto the rod wall of the drive rod 3. A stationary gear 7, which meshes with the moving gear 6, is rotatably mounted on the inner wall of the lower housing 2. Two side plates 8 are integrally mounted on the lower end of the upper housing 1. The two side plates 8 are rotatably connected to a rotating shaft 9. A carbon ribbon take-up roller 10 is fixedly fitted onto the shaft wall of the rotating shaft 9. The stationary gear 7 is connected to a transmission mechanism 11. The transmission mechanism 11 includes a friction iron disc 111 disposed on one side of the stationary gear 7. A transmission block 112 is provided on one side of the friction iron disc 111. A groove 113 is provided on the side wall of the transmission block 112. An electromagnet 114 is fixedly disposed at the bottom of the groove 113. The electromagnet 114 is connected to a conductive component 115 connected to the thermal transfer printhead assembly 13. The friction iron disc 111 and the stationary gear 7 are connected to an elastic reset component 116. When the friction iron disc 111 is attracted by the electromagnet 114, the stationary gear 7 will drive the transmission block 112 to rotate synchronously under the action of friction.

[0028] The conductive component 115 includes a conductive rod 1151 fixedly inserted into the shaft wall of the rotating shaft 9, and the conductive rod 1151 is connected to the electromagnet 114. The side wall of the side plate 8 is fixedly provided with a conductive slip ring 1152 that is slidably connected to the conductive rod 1151, and the conductive slip ring 1152 is connected to the thermal transfer printhead assembly 13. The rotating shaft 9 and the side plate 8 are both made of insulating material. Through the conductive rod 1151 and the conductive slip ring 1152, it can be ensured that the thermal transfer printhead assembly 13 is normally energized and synchronized with the electromagnet 114.

[0029] The elastic reset assembly 116 includes multiple slide rods 1161 fixedly inserted into the side wall of the stationary gear 7. The rod wall of each slide rod 1161 is slidably connected to the side wall of the friction iron plate 111. Multiple second springs 1162 are fixedly provided between the friction iron plate 111 and the stationary gear 7. When the friction iron plate 111 moves, it will stretch the second springs 1162. After the electromagnet 114 is de-energized, the friction iron plate 111 can be moved back to reset.

[0030] The friction disc 111 has an integrally formed compensation block 22 on its side wall, and the compensation block 22 is fitted with a rubber sleeve 23 that is interference-fitted with the groove wall of the groove 113. Through the friction between the compensation block 22 and the rubber sleeve 23 and the groove 113, when the friction disc 111 is disengaged from the transmission block 112, the compensation block 22 and the rubber sleeve 23 can be used to make the carbon ribbon continue to wind a certain distance, so that the two adjacent printing parts on the carbon ribbon maintain a certain gap. This can avoid the blank part on the carbon ribbon causing the label head to be incompletely printed when printing the next label.

[0031] A base 12 is provided on the upper inner wall of the upper housing 1, located on one side of the carbon ribbon take-up roller 10. Below the base 12 is a heat transfer printhead assembly 13 connected to the transmission mechanism 11. A pressure mechanism 14 is also provided inside the base 12. The transmission mechanism 11 is connected to the heat transfer printhead assembly 13 via the pressure mechanism 14. The pressure mechanism 14 includes a circular groove 141 formed inside the base 12. A first rubber piston 142 is slidably disposed inside the circular groove 141. A first spring 143 is provided between the first rubber piston 142 and the bottom of the circular groove 141. A connecting rod 144 is fixed between the first rubber piston 142 and the heat transfer printhead assembly 13. An air chamber 145 is formed inside the base 12 above the circular groove 141, and a vent hole 146 is formed between the air chamber 145 and the circular groove 141. The interior of 145 is provided with a second rubber piston 147, and the end face of the second rubber piston 147 is fixed with a push rod 148 that is slidably connected to the cavity wall of the air chamber 145. The rod end of the push rod 148 is fixed with a pressure plate 149, and the plate end of the pressure plate 149 is located on the eccentric side of the friction iron plate 111. When the friction iron plate 111 moves, it will push the pressure plate 149 to move, so that under the action of the push rod 148, the second rubber piston 147 will be pushed to squeeze the air inside the air chamber 145 into the circular groove 141. The increased air pressure can be used to cooperate with the first rubber piston 142 and the connecting rod 144 to drive the thermal transfer printhead assembly 13 to move down, so that the ribbon can be pressed and adhered to the label paper. At this time, the thermal transfer printhead assembly 13 performs normal printing work. When the label paper moves separately in the future, there will be no excessive friction between the label paper and the ribbon.

[0032] The heat transfer printhead assembly 13 has pressure rollers 28 rotatably connected to both side walls. A transfer support 15 is provided at the lower housing 2. Two fixing plates 16 are located on the upper inner wall of the upper housing 1, on one side of the base 12. A ribbon mounting plate 17 is rotatably mounted on the side wall of each fixing plate 16. An adhesive application mechanism 18 is located inside the lower housing 2. A discharge port 19 is shared between the upper housing 1 and the lower housing 2. A cover 20 is fixedly mounted on the outer side wall of the lower housing 2. A gear reduction drive assembly 21, connected to the drive rod 3, is located inside the cover 20. The gear reduction drive assembly 21 consists of a drive motor, multiple reduction gears, etc. The adhesive application mechanism 18 includes a connecting roller 181 rotatably mounted inside the lower housing 2. A strip 182 is fixedly mounted on the outer side wall of the lower housing 2. Both the shell 2 and the transfer base 15 have paper passage holes on their side walls. The connecting roller 181 is connected to the release paper 183 by pushing the rubber roller sleeve 4, the strip plate 182 and the paper passage holes. The upper end of the upper shell 1 is inserted with a label storage frame 184. The lower shell 2 has two slot plates 185 fixedly installed inside. The side wall of the lower shell 2 is inserted between the two slot plates 185. The lower shell 2 has three sprockets 187 arranged in a triangle inside. The three sprockets 187 are connected to a chain 188 by driving the chain. The side wall of the chain 188 is fixedly fitted with a glue-coating pad 189. Labels can be stored through the label storage frame 184. Glue can be introduced between the two slot plates 185 through the glue-coating tube 186. Glue can be applied to the bottom of the label paper through the glue-coating pad 189.

[0033] Inside the lower housing 2, a separation plate 24 is fixedly installed between the adhesive pad 189 and the release paper 183. Inside the lower housing 2, a transfer roller 25 is rotatably installed. The transfer roller 25 and the axle of the sprocket 187 on the same side are connected by a belt drive assembly 26. Inside the lower housing 2, a limiting roller 27 is rotatably installed above the release paper 183. Using the action of the separation plate 24, the label adhered to the adhesive pad 189 can be detached from the separation plate 24. At this time, under the friction of the transfer roller 25, the adhesive-coated label can be moved to the release paper 183. The belt drive assembly 26 consists of a motor, belt, etc., and is used to drive the synchronous transmission of the transfer roller 25 and the chain 188.

[0034] The upper housing 1 and lower housing 2 should also be equipped with a control circuit board (not shown in the figure) for controlling the thermal transfer printhead assembly 13 to print according to the pre-designed pattern. The connection structure between the ribbon mounting tray 17 and the ribbon roll, and the locking structure after the upper housing 1 and lower housing 2 are all existing mature technologies, so they are not described in detail.

[0035] The operating principle of the present invention is described as follows: The upper housing 1 is flipped up, and the carbon ribbon roll is installed through the carbon ribbon mounting plate 17. The movable end of the carbon ribbon is wound around the carbon ribbon take-up roller 10. Then the upper housing 1 and the lower housing 2 are closed, and an appropriate amount of label paper is placed in the label storage frame 184. Then the gear reduction drive assembly 21 and the belt drive assembly 26 are started. At this time, the drive rod 3 can be driven to rotate the push roller sleeve 4. With the cooperation of the top plate 5, the release paper 183 can be moved by friction. The belt drive assembly 26 works, which can make the three sprockets 187 rotate. This can make the chain 188 drive the adhesive pad 189 to rotate cyclically. After the adhesive pad 189 comes into contact with the adhesive between the two groove plates 185, the labels in the label storage frame 184 can be carried out in sequence. Through the separation plate 24 and the transfer roller 25, the labels can be transferred to the release paper 183.

[0036] When the label moves to the position of the thermal transfer printhead assembly 13, the thermal transfer printhead assembly 13 is energized. At this time, the electromagnet 114 is activated and can attract the friction iron disc 111. When the drive rod 3 drives the moving gear 6 to rotate, the stationary gear 7 can rotate synchronously. At this time, under the action of the friction iron disc 111, the rotating shaft 9 can rotate synchronously, so that the ribbon take-up roller 10 can drive the ribbon and the label paper to move synchronously. At the same time, when the friction iron disc 111 is attracted, it will push the pressure plate 149, which can drive the push rod 148 to push... The second rubber piston 147 is moved, which in turn forces the air inside the air chamber 145 into the circular groove 141 through the vent 146. The increased air pressure inside the circular groove 141 pushes the first rubber piston 142 downward, which in turn moves the thermal transfer printhead assembly 13 and the pressure roller 28 downward, thereby applying pressure to the ribbon and pressing it to adhere to the label paper. At this time, the thermal transfer printhead assembly 13 can transfer the toner on the ribbon to the label paper by heating, thus completing the label printing process.

[0037] After the label printing is completed, the thermal transfer printhead assembly 13 stops being powered on. At this time, the electromagnet 114 is de-energized. Under the action of the second spring 1162, the friction iron plate 111 can be moved back, thereby disengaging the friction iron plate 111 from the transmission block 112. As a result, the ribbon stops moving while the label paper continues to be driven, until the next label begins to be printed, at which point the ribbon continues to move synchronously with the label paper.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A label printer with self-adjusting function, comprising an upper casing (1) and a lower casing (2), characterized in that, The lower housing (2) is rotatably provided with a drive rod (3) on the front side inside. The drive rod (3) is fitted with a push roller sleeve (4). The lower housing (2) is provided with a top plate (5) that cooperates with the push roller sleeve (4). The drive rod (3) is fitted with a moving gear (6). The inner wall of the lower housing (2) is rotatably provided with a stationary gear (7) that meshes with the moving gear (6). The lower end of the upper housing (1) is integrally provided with two side plates (8). The two side plates (8) are rotatably connected to a rotating shaft (9). The shaft wall of the rotating shaft (9) is fixedly fitted with a carbon ribbon take-up roller (10). The rotating shaft (9) and the stationary gear (7) are connected to a transmission mechanism (11). The upper inner wall of the upper housing (1) is provided with a base (12) on one side of the carbon ribbon take-up roller (10). Below the base (12) is a heat transfer printhead assembly connected to the transmission mechanism (11). The base (12) is also provided with a pressure mechanism (14), the transmission mechanism (11) is connected to the heat transfer printhead assembly (13) through the pressure mechanism (14), the two side walls of the heat transfer printhead assembly (13) are rotatably connected with pressure rollers (28), the lower housing (2) is provided with a transfer support platform (15), the upper inner wall of the upper housing (1) is provided with two fixing plates (16) located on one side of the base (12), the side walls of the two fixing plates (16) are rotatably provided with carbon ribbon mounting discs (17), the lower housing (2) is provided with a glue application mechanism (18), the upper housing (1) and the lower housing (2) are provided with a discharge port (19), the outer side wall of the lower housing (2) is fixedly provided with a cover (20), the inside of the cover (20) is provided with a gear reduction drive assembly (21) connected to the drive rod (3). The transmission mechanism (11) includes a friction iron disc (111) disposed on one side of the stationary gear (7), a transmission block (112) disposed on one side of the friction iron disc (111), a groove (113) provided on the side wall of the transmission block (112), an electromagnet (114) fixedly disposed at the bottom of the groove (113), and a conductive component (115) connected to the electromagnet (114) and the thermal transfer printhead assembly (13), and an elastic reset component (116) connected to the friction iron disc (111) and the stationary gear (7). The pressurizing mechanism (14) includes a circular groove (141) formed inside the base (12). A first rubber piston (142) is slidably disposed inside the circular groove (141). A first spring (143) is provided between the first rubber piston (142) and the bottom of the circular groove (141). A connecting rod (144) is fixed between the first rubber piston (142) and the heat transfer printhead assembly (13). The interior of the base (12) is located above the circular groove (141). An air chamber (145) is provided at the position, and a vent hole (146) is provided between the air chamber (145) and the circular groove (141). A second rubber piston (147) is provided inside the air chamber (145), and a push rod (148) is fixed on the end face of the second rubber piston (147) and slidably connected to the cavity wall of the air chamber (145). A pressure plate (149) is fixed on the rod end of the push rod (148), and the plate end of the pressure plate (149) is located on the eccentric side of the friction iron disc (111). The glue coating mechanism (18) includes a connecting roller (181) rotatably disposed inside the lower housing (2). A strip plate (182) is fixedly disposed on the outer side wall of the lower housing (2). Paper passage holes are opened on the side walls of the lower housing (2) and the transfer platform (15). The connecting roller (181) is connected to the release paper (183) by pushing the glue roller sleeve (4), the strip plate (182) and the paper passage holes. A label storage frame (184) is inserted into the upper end of the upper housing (1). Two slot plates (185) are fixedly disposed inside the lower housing (2). A glue injection tube (186) is inserted between the two slot plates (185) on the side wall of the lower housing (2). Three sprockets (187) are arranged in a triangular pattern inside the lower housing (2). The three sprockets (187) are connected to a chain (188) through a common drive. A glue coating pad (189) is fixedly sleeved on the side wall of the chain (188).

2. A label printer with self-adjusting function according to claim 1, characterized in that, The conductive component (115) includes a conductive rod (1151) fixedly inserted into the shaft wall of the rotating shaft (9), and the conductive rod (1151) is connected to the electromagnet (114). The side wall of the side plate (8) is fixedly provided with a conductive slip ring (1152) that is slidably connected to the conductive rod (1151), and the conductive slip ring (1152) is connected to the thermal transfer printhead assembly (13). The rotating shaft (9) and the side plate (8) are both made of insulating material.

3. A label printer with self-adjusting function according to claim 1, characterized in that, The elastic reset assembly (116) includes multiple slide rods (1161) that are fixedly inserted into the side wall of the stationary gear (7). The rod wall of each slide rod (1161) is slidably connected to the side wall of the friction iron disc (111). Multiple second springs (1162) are fixedly provided between the friction iron disc (111) and the stationary gear (7).

4. A label printer with self-adjusting function according to claim 1, characterized in that, The side wall of the friction iron disc (111) is integrally provided with a compensation block (22), and the compensation block (22) is fitted with a rubber sleeve (23) that is interference fit with the groove wall of the groove (113).

5. A label printer with self-adjusting function according to claim 1, characterized in that, A separation plate (24) is fixedly provided inside the lower housing (2) between the adhesive pad (189) and the release paper (183). A transfer roller (25) is rotatably provided inside the lower housing (2). A belt drive assembly (26) is connected between the transfer roller (25) and the axle of the sprocket (187) on the same side. A limiting roller (27) is rotatably provided inside the lower housing (2) above the release paper (183).

Images