Rubber roller limiting structure and thermal printer

Abstract

The utility model discloses a rubber roller limiting structure for a thermal printer and a thermal printer having the rubber roller limiting structure. The rubber roller limiting structure includes a first support portion and a second support portion having C-shaped slots at both ends of the rubber roller, wherein a first sleeve and a second sleeve are provided at both ends of the central axis of the rubber roller, and the sleeves are respectively clamped and fixed in the C-shaped slots; at least one of the two sleeves is provided with a limiting protrusion extending along the radial direction of the rubber roller, and the rubber roller limiting structure also includes a limiting structure for limiting the movement of the limiting protrusion. The utility model has the advantages of simple structure and can accurately limit the position of the rubber roller.

Description

Technical Field

[0001] The utility model belongs to the field of printing, and in particular relates to a rubber roller limiting structure for a thermal printer and a thermal printer with the rubber roller limiting structure. Background Art

[0002] Thermal printers use a print head with a heating element to heat the print medium with heat-sensitive materials to form the desired text or pattern. Thermal printers generally have a main body, in which a rubber roller and a driving device for driving the rubber roller to rotate are arranged. The rotation of the rubber roller drives the movement of the print medium so that the printing process can be carried out continuously. When the thermal printer prints at high speed, it is very important that the rubber roller rotates stably to transport the print medium, otherwise it will affect the print quality, so the position of the rubber roller needs to be limited.

[0003] Existing thermal printers generally have complex limiters at both ends of the rubber roller to restrict the movement of the rubber roller, so that the rubber roller can be accurately positioned and rotated stably. However, the limiter structure is too complicated, which increases the difficulty of installation and makes the user experience poor. At the same time, the complex structure of the limiter and the high precision requirements increase the cost of the thermal printer. Summary of the invention

[0004] In view of the problems existing in the prior art, the main purpose of the utility model is to provide a rubber roller limiting structure which has a simple structure and can accurately limit the position of the rubber roller;

[0005] Another object of the utility model is to provide a thermal printer having a rubber roller limiting structure with simple structure and precise limiting.

[0006] In order to achieve the above-mentioned main purpose, the utility model provides a rubber roller limiting structure, including a first supporting part and a second supporting part supporting both ends of the rubber roller, wherein the rubber roller includes a roller body and a center axis, the center axis further extends axially relative to the roller body to form a first extension part and a second extension part, the first extension part and the second extension part are sleeved with a first shaft sleeve and a second shaft sleeve, the first supporting part and the second supporting part respectively support the first shaft sleeve and the second shaft sleeve, the first supporting part and the second supporting part are respectively provided with a first C-shaped groove and a second C-shaped groove, the first shaft sleeve and the second shaft sleeve are respectively clamped and fixed in the first C-shaped groove and the second C-shaped groove; at least one of the first shaft sleeve and the second shaft sleeve is provided with a limiting protrusion extending radially along the rubber roller, and the rubber roller limiting structure also includes a limiting structure that cooperates with the limiting protrusion to limit the movement of the limiting protrusion.

[0007] It can be seen from the above scheme that by arranging shaft sleeves at both ends of the rubber roller and arranging C-shaped grooves on the supporting part, the rubber roller can be stably positioned on the supporting part so that the rubber roller will not move radially. The cooperation between the limiting protrusion and the limiting structure will prevent the rubber roller from moving axially. Compared with other parts of the rubber roller, it is relatively simple and convenient to limit the position of the radially protruding limiting protrusion, so that the position of the rubber roller can be accurately limited. The structure of the C-shaped groove and the shaft sleeve is also relatively simple and easy to install.

[0008] According to a specific implementation of the utility model, the first extension portion is connected to a driving mechanism that drives the rubber roller to rotate, and the limiting protrusion is arranged on the first shaft sleeve.

[0009] It can be seen from the above scheme that at the driving end close to the driving mechanism, the rubber roller is more inclined to move to a different position upon receiving the driving force, and the movement of the rubber roller can be more effectively limited by arranging the limiting protrusion at this end.

[0010] According to a specific implementation of the utility model, the limiting structure includes an axial limiter arranged opposite to the outer side surface of the first supporting portion away from the roller body, and the limiting protrusion is arranged in a gap between the axial limiter and the first supporting portion.

[0011] It can be seen from the above scheme that by arranging an axial limiter on the outside of the first supporting part, the setting of the axial limiter can be made more flexible and will not affect the rubber roller. The limiting protrusion is arranged between the axial limiter and the first supporting part and cannot move axially, thereby limiting the axial movement of the rubber roller.

[0012] According to a specific implementation of the utility model, the limiting structure further includes a rotation limiting member disposed in the gap, and the rotation limiting member can abut against the limiting protrusion to limit the rotation of the limiting protrusion along the rotation direction of the rubber roller.

[0013] It can be seen from the above scheme that since the sleeve is arranged on the central axis of the rubber roller, it tends to rotate simultaneously with the rubber roller when the rubber roller rotates. By limiting the limiting protrusion along the rotation direction of the rubber roller through the rotation limit member, the movement of the first sleeve in the direction perpendicular to the axial direction can be controlled, thereby limiting the movement of the rubber roller in this direction.

[0014] According to a specific implementation of the utility model, the first sleeve is provided with a first flange, the first flange abuts against the outer side surface of the first supporting portion, and the limiting protrusion is provided on the first flange.

[0015] It can be seen from the above solution that the axial movement of the sleeve and the rubber roller toward the non-driving end of the rubber roller can be further restricted by providing the first flange to abut against the outer side surface of the first supporting portion.

[0016] According to a specific implementation of the utility model, a second flange is provided at the end of the second sleeve close to the roller body, and the second flange abuts against the inner side surface of the second supporting portion facing the roller body.

[0017] It can be seen from the above solution that the axial movement of the sleeve and the rubber roller toward the non-driving end of the rubber roller can be further restricted by providing the second flange to abut against the inner side surface of the second supporting portion.

[0018] According to a specific implementation of the utility model, a second flange is provided at the end of the second sleeve close to the roller body, and the second C-shaped groove is provided with a stepped surface to cooperate with the second flange.

[0019] It can be seen from the above solution that the axial movement of the sleeve and the rubber roller toward the non-driving end of the rubber roller can be further restricted by arranging the second flange to abut against the stepped surface of the second supporting portion.

[0020] According to a specific embodiment of the utility model, the rubber roller limiting structure also includes a supporting member arranged on the outer side of the roller body along the axial direction of the rubber roller, and the surface of the supporting member facing the roller body is arranged as an arc surface coaxial with the rubber roller. The supporting member can support the roller body of the rubber roller and prevent the rubber roller from deforming.

[0021] According to a specific implementation of the utility model, the supporting member is arranged below or below the roller body, and is evenly arranged in multiple numbers along the axial direction. Multiple evenly arranged supporting members can better support the roller body of the rubber roller.

[0022] To achieve the above another object, the utility model provides a thermal printer having the above rubber roller limiting structure.

[0023] It can be seen from the above scheme that the position of the rubber roller can be accurately limited by cooperating between the shaft sleeve and the C-shaped slot, the limiting protrusion and the limiting structure, so that the thermal printer has a simple structure and the rubber roller is easy to install, thereby reducing the cost.

[0024] In order to more clearly illustrate the above-mentioned objectives, technical solutions and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 2 It is a structural schematic diagram of the main body in the embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of the exploded structure of the main body in the embodiment of the utility model;

[0028] Figure 4 yes Figure 3 Middle A is a partial enlarged schematic diagram;

[0029] Figure 5 This is a schematic diagram of the structure of the main body of the embodiment of the utility model after the rubber roller is removed;

[0030] Figure 6 yes Figure 5 Middle B is a partial enlarged schematic diagram;

[0031] Figure 7 It is a structural schematic diagram of the rubber roller in the embodiment of the utility model;

[0032] Figure 8 It is a structural schematic diagram of the rubber roller in another perspective in the embodiment of the utility model;

[0033] Fig. 9 It is a schematic diagram of the structure of the second shaft sleeve in the embodiment of the utility model;

[0034] Fig.10 It is a structural schematic diagram of the first shaft sleeve in the embodiment of the utility model. DETAILED DESCRIPTION

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but it is easy for those skilled in the art to understand that the present invention can also be implemented in other ways different from those described herein. Therefore, other possible implementation methods that can be known by those skilled in the art based on the embodiments described in this application all belong to the protection scope of this application.

[0036] The specific structure of the embodiment of the utility model is described in detail below according to the accompanying drawings. It can be understood that the embodiment of the utility model includes but is not limited to the illustrated structure, and those skilled in the art can make corresponding adjustments and improvements to its structure according to actual conditions.

[0037] like Figure 1 As shown, the thermal printer embodiment of the utility model includes a cover assembly 10 and a main body 20, wherein the cover assembly 10 can be opened and closed relative to the main body 20. When the cover assembly 10 is in the closed position, there is a paper outlet 30 between the cover assembly 10 and the main body 20, and the printed thermal paper and other printing media are discharged from the paper outlet 30. The cutter for cutting the printing medium is generally arranged on the cover assembly 10.

[0038] like Figure 2 and Figure 3As shown, the main body 20 includes an outer shell 21 and a rubber roller assembly 22 installed and fixed on the outer shell 21, the rubber roller assembly 22 includes a rubber roller 221, a first sleeve 222 and a second sleeve 223, and the outer shell 21 is provided with a first support portion 212 and a second support portion 211, wherein the first support portion 212 and the second support portion 211 can be set to a plate with a C-shaped groove, respectively supporting the first sleeve 222 and the second sleeve 223, and the roller body of the rubber roller 221 for conveying the printing medium is arranged between the first support portion 212 and the second support portion 211, and the first extension portion and the second extension portion that further extend axially relative to the central axis of the roller body are respectively sleeved with the first sleeve 222 and the second sleeve 223, wherein the end of the first extension portion is connected to the driving mechanism that drives the rubber roller 221 to rotate, that is, the first support portion 212 is arranged to be close to the driving end of the rubber roller 221. The outer shell 21 is also evenly provided with a plurality of supporting members 213 along the axial direction of the roller body, and the surface of the supporting member 213 facing the roller body is arranged as an arc surface coaxial with the rubber roller.

[0039] like Figure 4 As shown, the second supporting portion 211 is provided with a second C-shaped slot 2111, an arcuate transition surface 2112 and a step surface 2113, the distance between the third protrusion 2114 and the fourth protrusion 2115 is smaller than the outer diameter of the second sleeve 223, and the inner diameter of the second C-shaped slot 2111 matches the outer diameter of the second sleeve 223, so that the second sleeve 223 can be fixed in the second C-shaped slot 2111. In other embodiments, the step surface may not be provided, and the flange portion of the second sleeve may fit the inner side surface of the second supporting portion.

[0040] like Figure 5 and Figure 6 As shown, the first support part 212 is provided with a first C-shaped groove 2121, the distance between the first protrusion 2122 and the second protrusion 2123 is smaller than the outer diameter of the first sleeve 222, and the inner diameter of the first C-shaped groove 2121 matches the outer diameter of the first sleeve 222, so that the first sleeve 222 can be fixed in the first C-shaped groove 2121. The baffle 2124 as an axial limiter is arranged opposite to the outer side of the first support part 212 away from the roller body, that is, the baffle 2124 is closer to the driving end of the rubber roller 221, so that a gap 2125 is formed between the baffle 2124 and the first support part 212, and a U-shaped protrusion 2126 as a rotation limiter is arranged in the gap 2125.

[0041] like Figure 7 and Figure 8As shown, the rubber roller 221 includes a roller body 2211 and a center axis, and the center axis further extends axially relative to the roller body 2211 to form a first extension portion 2212 and a second extension portion 2213, wherein the portions of the two portions close to the roller body 2211 are respectively provided with abutment surfaces 2214 and 2215 for abutting with the shaft sleeve, and the end of the first extension portion 2212 away from the roller body 2211 is provided with a matching portion 2216 for connecting with a mechanism that drives the rubber roller 2211 to rotate, such as a gear.

[0042] like Fig. 9 As shown, the second sleeve 223 has a second flange 2231, a second clamping portion 2232 and a second inner hole 2233, wherein the second clamping portion 2232 can be clamped in the second C-shaped clamping groove 2111 of the second supporting portion 211, and the second inner hole 2233 can penetrate the second extension portion 2213 of the central axis of the rubber roller, and the side surface of the second flange 2231 is abutted against the abutting surface 2215, and the second flange 2231 is arranged in the step surface 2113 and fits with its inner side surface. In other embodiments, the second sleeve may not be provided with a flange.

[0043] like Fig.10 As shown, the first sleeve 222 has a first flange 2221, a first clamping portion 2222 and a first inner hole 2223, wherein the first clamping portion 2222 can be clamped in the first C-shaped groove 2111 of the first supporting portion 212, the first inner hole 2223 can penetrate the first extension portion 2212 of the center axis of the rubber roller and abut against the abutting surface 2214, the first flange 2221 can fit with the outer side surface of the first supporting portion 212, and a limiting protrusion 2224 is provided thereon.

[0044] Before the rubber roller 221 is installed on the main body 21, the first sleeve 222 and the second sleeve 223 can be installed on the first extension part 2212 and the second extension part 2213 respectively, so that they are respectively abutted against the abutting surfaces 2214 and 2215 to form the rubber roller assembly 22; then the second sleeve 223 is connected to the second supporting part 211, the second clamping part 2232 is clamped and fixed in the second C-shaped clamping groove 2111, and the second flange 2231 is set in the step surface 2113 and is connected with the inner Then the first sleeve 222 is connected to the first support part 212, the first clamping part 2222 is clamped in the first C-shaped clamping groove 2121, the first flange 2221 can be fitted with the outer side of the first support part 212, and the limiting protrusion 2224 is allowed to enter the gap 2125 and abut against the U-shaped protrusion 2126 by rotating the rubber roller 221 or the second sleeve 222, and the rubber roller 221 is connected to the driving mechanism, and the installation of the rubber roller 221 on the main body 20 is completed. Alternatively, the second sleeve 223 can be installed on the rubber roller 221 first, and after the second sleeve 223 is installed to the second support part 211, the first sleeve 222 is installed and installed to the first support part 212 and connected to the driving mechanism.

[0045] When the thermal printer is working, the rubber roller 221 rotates rapidly. Since the limiting protrusion 2224 is restricted in the gap 2125 between the baffle 2124 and the first supporting portion 212, the rubber roller 221 cannot move in the axial direction. When the rubber roller 221 rotates, the sleeve tends to rotate simultaneously with the rubber roller 221. The U-shaped protrusion 2126 restricts the limiting protrusion 2224 in the rotation direction of the rubber roller, so that the first sleeve 222 can move in a direction perpendicular to the axial direction, thereby limiting the movement of the rubber roller 221 in this direction.

[0046] It can be seen from the above that by arranging a limiting protrusion for limiting the sleeve at at least one end of the rubber roller and arranging a C-shaped slot and a matching limiting structure on the outer shell, the position where the rubber roller may shift forward, backward, left and right can be limited, thereby improving the stability of the rubber roller during printing. Compared with the existing complex rubber roller limiting method, it uses less material, has low cost, and is easy to install.

[0047] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art can make some improvements without departing from the scope of the present invention, that is, any changes or improvements made according to the present invention should be covered by the protection scope of the present invention.

Claims

1. A rubber roller limiting structure, comprising a first supporting part and a second supporting part supporting both ends of the rubber roller, wherein the rubber roller comprises a roller body and a central axis, the central axis further extends axially relative to the roller body to form a first extension part and a second extension part, the first extension part and the second extension part are sleeved with a first sleeve and a second sleeve, the first supporting part and the second supporting part respectively support the first sleeve and the second sleeve, characterized in that: The first supporting portion and the second supporting portion are respectively provided with a first C-shaped slot and a second C-shaped slot, and the first shaft sleeve and the second shaft sleeve are respectively clamped and fixed in the first C-shaped slot and the second C-shaped slot; At least one of the first sleeve and the second sleeve is provided with a limiting protrusion extending in the radial direction of the rubber roller, and the rubber roller limiting structure also includes a limiting structure cooperating with the limiting protrusion to limit the movement of the limiting protrusion.

2. The rubber roller limiting structure according to claim 1, characterized in that: The first extension portion is connected to a driving mechanism that drives the rubber roller to rotate, and the limiting protrusion is arranged on the first shaft sleeve.

3. The rubber roller limiting structure according to claim 2 is characterized in that: The limiting structure comprises an axial limiting member arranged opposite to the outer side surface of the first supporting portion away from the roller body, and the limiting protrusion is arranged in a gap between the axial limiting member and the first supporting portion.

4. The rubber roller limiting structure according to claim 3 is characterized in that: The limiting structure further includes a rotation limiting member disposed in the gap, and the rotation limiting member can abut against the limiting protrusion to limit the rotation of the limiting protrusion along the rotation direction of the rubber roller.

5. The rubber roller limiting structure according to claim 2, characterized in that: The first sleeve is provided with a first flange, the first flange abuts against the outer side surface of the first supporting portion, and the limiting protrusion is provided on the first flange.

6. The rubber roller limiting structure according to claim 2, characterized in that: A second flange is disposed at an end of the second sleeve close to the roller body, and the second flange abuts against an inner side surface of the second supporting portion facing the roller body.

7. The rubber roller limiting structure according to claim 2, characterized in that: The end of the second sleeve close to the roller body is provided with a second flange, and the second C-shaped groove is provided with a stepped surface to cooperate with the second flange.

8. The rubber roller limiting structure according to any one of claims 1 to 7, characterized in that: The rubber roller limiting structure also includes a supporting member arranged on the outer side of the roller body along the axial direction of the rubber roller, and the surface of the supporting member facing the roller body is arranged to be an arc surface coaxial with the rubber roller.

9. The rubber roller limiting structure according to claim 8, characterized in that: The supporting member is arranged below or below the roller body, and is evenly arranged in plurality along the axial direction.

10. Thermal printer, characterized in that: The thermal printer comprises the rubber roller limiting structure according to any one of claims 1 to 9.

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