A thermal printer having a gear cover for a roller shaft

Abstract

The utility model provides a kind of hot sensitive printer with gear cover's roller shaft sleeve, including base, cover, drive assembly, rubber roll, thermosensitive sheet and first roller shaft sleeve, first roller shaft sleeve is provided with first axle hole along axial direction, the first axial end portion of rubber roll passes through first axle hole and is driven gear driving connection, driven gear is located in gear slot, first roller shaft sleeve is matched with first positioning slot clearance, annular guard wall is provided in the upper outer periphery of driven gear of first roller shaft sleeve, annular guard wall covers gear slot. By the outer periphery of first roller shaft sleeve in first axle hole setting annular guard wall, utilize annular guard wall cover gear slot and driven gear, in turn form the shielding and protection of driven gear, and also improve assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of thermal printing technology, and in particular to a thermal printer with a roller bushing having a gear cover. Background Technology

[0002] With the widespread application of thermal printers, they are used extensively in the warehousing and logistics industry. Thermal printers include thermal transfer printers that use the principle of thermal transfer with ribbon, and thermal printers that use thermal paper for thermal imaging. After thermal printing, the printed paper is output for users to use.

[0003] Thermal printers typically consist of a base, a cover, a rubber roller, and a thermal sheet. Paper enters the space between the rubber roller and the thermal sheet, where the heating element heats the paper, thus creating an image. The rubber roller rotates via gears and a motor. The gears typically require lubrication, and the axial end of the rubber roller usually houses gears. Since changing the paper requires opening the cover, these exposed gears need to be shielded to prevent accidental contact by the user.

[0004] Furthermore, in commercial thermal printers, the rubber roller is a consumable part that needs to be replaced after prolonged printing. Therefore, the ease of replacing and assembling the rubber roller is crucial. Utility Model Content

[0005] The purpose of this invention is to provide a thermal printer with a roller bushing having a gear cover.

[0006] To achieve the purpose of this utility model, this utility model provides a thermal printer with a roller bushing having a gear cover, including a base, a cover body, a drive assembly, a rubber roller, and a thermal sheet. The thermal sheet is disposed on the cover body, and the rubber roller is rotatably disposed on the base. The cover body is located above the base and connected to the base, forming a paper outlet between the cover body and the base. The thermal sheet and the rubber roller face each other and form a paper feeding channel, which communicates with the paper outlet. The drive assembly includes a motor, a drive gear, and a driven gear. The driven gear is connected to the axial end of the rubber roller, and the drive gear is connected to the output shaft of the motor. The drive gear and the driven gear are connected. The thermal printer also includes a first roller bushing, the first roller... The shaft sleeve has a first shaft hole along the axial direction. The rubber roller includes a roller and a rubber layer. The rubber layer is located on the outer periphery of the roller. The first axial end of the roller passes through the first shaft hole and is driven and connected to the driven gear. The upper surface of the base is provided with a rubber roller groove and a gear groove. The rubber roller groove is arranged along the paper width direction. The gear groove is located at the end of the rubber roller groove based on the paper width direction. A first positioning groove is provided between the rubber roller groove and the gear groove. The rubber roller groove, the gear groove and the first positioning groove have an opening at the top. The rubber roller is set in the rubber roller groove. The driven gear is located in the gear groove. The first roller sleeve is clearance-fitted with the first positioning groove. The first roller sleeve is provided with an annular protective wall on the upper outer periphery of the driven gear. The annular protective wall covers the gear groove.

[0007] A further proposed solution is to have a mounting sidewall on the lower side of the upper surface of the base, with the mounting sidewall perpendicular to the upper surface. The motor is mounted on the mounting sidewall, and the drive gear and driven gear are located on the outer side of the mounting sidewall.

[0008] A further alternative is that the drive assembly includes a transmission gear, which is rotatably mounted on the outer side of the mounting sidewall and connected between the drive gear and the driven gear.

[0009] A further embodiment is that the thermal printer also includes a second roller bushing, which has a second shaft hole along the axial direction, and the second axial end of the roller is clearance-fitted with the second shaft hole; the upper surface of the base is provided with a second positioning groove, which is located at the other end of the rubber roller groove based on the paper width direction, and the second positioning groove is connected to the rubber roller groove, which has an opening at the top, and the second roller bushing is clearance-fitted with the second positioning groove.

[0010] A further proposed solution is to make the curvature of the annular retaining wall less than or equal to π.

[0011] A further proposed solution is to have an arc of the annular retaining wall greater than or equal to π / 3.

[0012] A further proposed solution is to provide a clearance groove on the lower surface of the cover, with the clearance groove located above the annular protective wall, and the annular protective wall and the clearance groove fitting together with a gap.

[0013] A further proposed solution is to arrange the clearance groove in a concave arc shape.

[0014] The beneficial effects of this invention are as follows: Since a driven gear is provided at the end of the rubber roller, and an annular protective wall is provided around the outer periphery of the first shaft hole via the first roller sleeve, the annular protective wall covers the gear groove and the driven gear, thereby shielding and protecting the driven gear. Furthermore, the rubber roller groove, gear groove, first positioning groove, and second positioning groove all have openings at the top, facilitating the assembly and positioning of the rubber roller, the first roller sleeve, and the second roller sleeve, and ensuring stable rotation of the rubber roller. Moreover, the installation of the motor and gear via the mounting sidewall ensures stable rotation of the rubber roller. Additionally, by providing an arc-shaped clearance groove on the cover, and utilizing the clearance fit between the annular protective wall and the clearance groove, the rubber roller and the thermal sheet are more tightly fitted, improving printing stability. Attached Figure Description

[0015] Figure 1 This is a structural diagram of an embodiment of the thermal printer of this utility model.

[0016] Figure 2 This is a structural diagram of the thermal printer embodiment of this utility model when printing the cover.

[0017] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0018] Figure 4 This is a structural diagram of the base in an embodiment of the thermal printer of this utility model.

[0019] Figure 5 This is an exploded view of the base in an embodiment of the thermal printer of this utility model.

[0020] Figure 6 This is a cross-sectional view of the base in an embodiment of the thermal printer of this utility model.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0022] Reference Figures 1 to 6 The thermal printer includes a base 11, a cover 12, a drive assembly 3, a rubber roller 2, and a thermal sheet 121. The thermal sheet 121 is disposed on the cover 12, and the rubber roller 2 is rotatably disposed on the base 11. The cover 12 is located above and connected to the base 11, and a paper output port 13 is formed between the cover 12 and the base 11. The thermal sheet 121 and the rubber roller 2 are opposite to each other and form a paper feeding channel, which communicates with the paper output port 13. In this embodiment, there is no paper tray; instead, an open paper tray arrangement is used, and printing paper can be input from the other end of the paper feeding channel, which corresponds to the paper output port 13. Of course, in addition to this embodiment, the main inventive concept of this embodiment can also be applied to thermal printers with a paper tray.

[0023] The thermal printer also includes a first roller sleeve 41 and a second roller sleeve 42. The main body of the first roller sleeve 41 is arranged in a cylindrical shape. The first roller sleeve 41 has a first shaft hole 411 along the axial direction. An annular protective wall 412 is provided above the outer periphery of the first roller sleeve 41 with the first roller sleeve 41. The annular protective wall 412 is located on the side away from the adhesive layer 22. The curvature of the annular protective wall 412 is less than or equal to π. Furthermore, the curvature of the annular protective wall 412 is greater than or equal to π / 3. The first roller sleeve 41 extends horizontally and has a handle 413. A locking block 414 is provided at the end of the handle 413. The main body of the second roller bushing 42 is arranged in a cylindrical shape. The second roller bushing 42 has a second shaft hole 421 along the axial direction. The second roller bushing 42 has a handle 422 extending in the horizontal direction. The end of the handle 422 is provided with a locking block 423. The structures on the first roller bushing 41 and the second roller bushing 42 are integrally formed, which saves the input of parts and improves the assembly efficiency.

[0024] The drive assembly 3 includes a motor, a drive gear 31, a driven gear 32, and a transmission gear 33. The driven gear 32 is connected to the axial end of the rubber roller 2. The rubber roller 2 includes a roller 21 and a rubber layer 22. The rubber layer 22 is located on the outer periphery of the roller 21. The first axial end of the roller 21 passes through the first shaft hole 411 and is drivenly connected to the driven gear 32. The second axial end of the roller 21 is clearance-fitted with the second shaft hole 421.

[0025] The upper surface of the base 11 is provided with a roller groove 112, a gear groove 113, a first positioning groove 114, and a second positioning groove 115. The roller groove 112 is arranged along the paper width direction. The gear groove 113 is located at the end of the roller groove 112 based on the paper width direction. The first positioning groove 114 is connected between the roller groove 112 and the gear groove 113. The second positioning groove 115 is located at the other end of the roller groove 112 based on the paper width direction and is connected to the roller groove 112. The roller groove 112, the gear groove 113, the first positioning groove 114, and the second positioning groove 115 have openings at the top.

[0026] The rubber roller 2 is set in the rubber roller groove 112, the driven gear 32 is located in the gear groove 113, the first roller bushing 41 is in clearance fit with the first positioning groove 114, the annular protective wall 412 is located on the upper outer periphery of the driven gear 32, the annular protective wall 412 covers the gear groove 113, and the second roller bushing 42 is in clearance fit with the second positioning groove 115.

[0027] The upper surface of the base 11 is also provided with a groove 116 and a slot 117. The extension direction of the groove 116 is perpendicular to the paper width direction. One end of the groove 116 is connected to the gear groove 113, and the other end of the groove 116 is connected to the slot 117. The handle 413 is located in the groove 116 and is in clearance fit with the groove 116. The locking block 414 is engaged with the slot 117.

[0028] The upper surface of the base 11 is also provided with a groove 118 and a slot 119. The extension direction of the groove 118 is perpendicular to the paper width direction. One end of the groove 118 is connected to the second positioning groove 115, and the other end of the groove 118 is connected to the slot 119. The handle 422 is located in the groove 118 and is in clearance fit with the groove 118. The locking block 423 is engaged with the slot 119.

[0029] A mounting sidewall 120 is provided on the lower side of the upper surface of the base 11. The mounting sidewall 120 is perpendicular to the upper surface. The motor is mounted on the mounting sidewall 120. The drive gear 31 and the driven gear 32 are located on the outer side of the mounting sidewall 120. The drive gear 31 is connected to the output shaft of the motor. The transmission gear 33 is rotatably disposed on the outer side of the mounting sidewall 120 and is connected between the drive gear 31 and the driven gear 32. The rotation of the motor and the transmission of the gears drive the rotation of the rubber roller 22. Of course, in addition to this embodiment, the drive gear can also be directly connected to the driven gear, or connected through multiple or more sets of transmission gears.

[0030] The lower surface of the cover 12 is provided with a relief groove 122, which is located above the annular protective wall 412. The relief groove 122 is arranged in an inward arc shape. When the cover 12 is closed, the upper part of the annular protective wall 412 is located in the relief groove 122 and is in clearance fit with the relief groove 122.

[0031] As can be seen from the above, by setting an annular protective wall on the outer periphery of the first roller bushing in the first shaft hole, the annular protective wall covers the gear groove and the driven gear, thereby shielding and protecting the driven gear. Furthermore, the roller groove, gear groove, first positioning groove, and second positioning groove all have openings at the top, facilitating the assembly and positioning of the roller, the first roller bushing, and the second roller bushing, and ensuring stable rotation of the roller. Moreover, the installation of the motor and gear via the mounting sidewall ensures stable rotation of the roller. Additionally, by setting an arc-shaped clearance groove in the cover, and utilizing the clearance fit between the annular protective wall and the clearance groove, the roller and the thermal sheet are more tightly fitted, improving printing stability.

Claims

1. A thermal printer with a roller bushing having a gear cover, comprising a base, a cover body, a drive assembly, a rubber roller, and a thermal sheet, wherein the thermal sheet is disposed on the cover body, the rubber roller is rotatably disposed on the base, the cover body is located above the base and connected to the base, a paper outlet is formed between the cover body and the base, the thermal sheet and the rubber roller are opposite to each other and form a paper feeding channel, and the paper feeding channel is in communication with the paper outlet; The drive assembly includes a motor, a drive gear, and a driven gear. The driven gear is connected to the axial end of the rubber roller. The drive gear is connected to the output shaft of the motor. The drive gear and the driven gear are connected. Its features are: The thermal printer further includes a first roller bushing, the first roller bushing having a first shaft hole along the axial direction, the rubber roller including a roller and a rubber layer, the rubber layer being located on the outer periphery of the roller, and the first axial end of the roller passing through the first shaft hole and being driven and connected to the driven gear. The upper surface of the base is provided with a rubber roller groove and a gear groove. The rubber roller groove is arranged along the paper width direction, and the gear groove is located at the end of the rubber roller groove based on the paper width direction. A first positioning groove is provided between the rubber roller groove and the gear groove. The rubber roller groove, the gear groove and the first positioning groove have an opening at the top. The rubber roller is disposed in the rubber roller groove, the driven gear is located in the gear groove, the first roller bushing is in clearance fit with the first positioning groove, and the first roller bushing is provided with an annular protective wall on the upper outer periphery of the driven gear, the annular protective wall covering the gear groove.

2. The thermal printer according to claim 1, characterized in that: The base has a mounting sidewall on the lower side of its upper surface. The mounting sidewall is perpendicular to the upper surface. The motor is mounted on the mounting sidewall. The drive gear and the driven gear are located on the outer side of the mounting sidewall.

3. The thermal printer according to claim 2, characterized in that: The drive assembly includes a transmission gear, which is rotatably disposed on the outer side of the mounting sidewall and is connected between the drive gear and the driven gear.

4. The thermal printer according to claim 1, characterized in that: The thermal printer further includes a second roller bushing, the second roller bushing having a second shaft hole along the axial direction, and the second axial end of the roller being clearance-fitted with the second shaft hole; The upper surface of the base is provided with a second positioning groove, which is located at the other end of the glue roller groove based on the paper width direction. The second positioning groove is connected to the glue roller groove. The glue roller groove and the second positioning groove have an opening at the top. The second roller bushing is clearance-fitted with the second positioning groove.

5. The thermal printer according to claim 1, characterized in that: The curvature of the annular retaining wall is less than or equal to π.

6. The thermal printer according to claim 5, characterized in that: The curvature of the annular retaining wall is greater than or equal to π / 3.

7. The thermal printer according to any one of claims 1 to 6, characterized in that: The lower surface of the cover is provided with a clearance groove, which is located above the annular protective wall, and the annular protective wall and the clearance groove are fitted with a clearance.

8. The thermal printer according to claim 7, characterized in that: The clearance groove is arranged in a concave arc shape.

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