Structure for preventing rubber roller from being forced to rotate during downward pressing

Abstract

The utility model relates to the technical field of thermal printers, and discloses a structure for preventing a rubber roller from being forced to rotate during downward pressing, which comprises a rotating central shaft and a support, the support is sleeved outside the rotating central shaft, and a top cover is fixedly connected between the top ends of the support. According to the structure for preventing the rubber roller from being forced to rotate when the rubber roller is pressed downwards, the second gear and other parts are arranged, the first gear and the sixth gear meshed with the first gear are modified gears, namely, tooth crests of teeth are sharp, and the two gears can be smoothly meshed when being meshed with each other through gear modification and filleted corners chamfered on the two sides of the tooth crests, and the supports are arranged at the left end and the right end of the rubber roller body; the tail portion of the support is a rotating center shaft of the top cover, when the turning cover rotates and falls down, a tooth block of the first gear can be well inserted between teeth of the sixth gear, the rubber roller body cannot be forced to rotate, when the turning cover is closed, the rubber roller body cannot rotate due to mutual meshing of the gears, the cover closing hand feeling is good, and the service life of the rubber roller is prolonged. The problem that the cover closing hand feeling is poor due to the fact that the rubber roller is forced to rotate is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal printers, in particular to a structure for preventing a rubber roller from being forced to rotate when pressed downward. Background Art

[0002] Most thermal printers use a rubber roller on the flip cover to press the thermal film. A rubber roller gear is mounted on one end of the rubber roller. When the flip cover is closed, the rubber roller gear teeth engage with the reduction gear set driven by the motor. The motor rotates, and the gear set drives the rubber roller to rotate.

[0003] Between initial engagement and full engagement, the transmission gear set will drive the rubber roller gear to rotate a certain distance. Since the rubber roller is pressing the thermal sheet, the rotation will generate a relatively large friction force. This friction force makes the flip cover close very unsmoothly. Because the gear set has a reduction ratio, it is easier to rotate the entire gear set from the motor end, but it is very difficult to rotate the entire gear set from the last gear. Therefore, the gear on the rubber roller cannot drive the gear set to rotate under the action of friction.

[0004] Now, a new type of structure is proposed to solve the above-mentioned problem by preventing the rubber roller from being forced to rotate when pressed down. Utility Model Content

[0005] The purpose of the utility model is to provide a structure to prevent the rubber roller from being forced to rotate when pressed down, so as to solve the problem of poor closing feel caused by the forced rotation of the rubber roller in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a structure for preventing the rubber roller from being forced to rotate when being pressed down, comprising a rotating central shaft and a bracket, the bracket being sleeved on the outside of the rotating central shaft, a top cover being fixedly connected between the top ends of the brackets, a reserved groove being provided on one side of the front end of the bracket, a rubber roller body being provided at the bottom end of the top cover, a heat-sensitive sheet being provided at the bottom end of the rubber roller body, a spring being provided at the bottom end of the heat-sensitive sheet, a connecting shaft being fixedly connected at the front and rear ends of the rubber roller body, the front end of the connecting shaft passing through the reserved groove and being fixedly connected to a first gear, a sixth gear being provided on one side of the bottom end of the first gear, a fourth gear being fixedly connected to the front end of the sixth gear, a driving motor being provided on one side of the bottom end of the bracket, a seventh gear being fixedly connected to the output end of the driving motor, a second gear being provided on one side of the seventh gear, an eighth gear being fixedly connected to the rear end of the second gear, a third gear being provided on one side of the eighth gear, a fifth gear being fixedly connected to the front end of the third gear, a fourth gear being provided on one side of the third gear, and a sixth gear being fixedly connected to the rear end of the fourth gear.

[0007] Preferably, the sixth gear is a shift gear, and the sixth gear is meshed with the first gear.

[0008] Preferably, the fifth gear is meshed with the fourth gear.

[0009] Preferably, four groups of springs are provided, and the springs are distributed at equal intervals at the bottom end of the thermal sheet.

[0010] Preferably, the seventh gear is meshed with the second gear.

[0011] Preferably, the eighth gear is meshed with the third gear.

[0012] Compared with the prior art, the beneficial effects of the present invention are: the structure for preventing the rubber roller from being forced to rotate when pressed down not only ensures that the rubber roller body will not be forced to rotate due to the force;

[0013] (1) By providing a second gear and other parts, the first gear and the meshing sixth gear are shift gears, that is, the tooth tops are relatively sharp, and then the gears are reshaped and the two sides of the tooth tops are rounded, so that the two gears can mesh smoothly when they mesh with each other. There are brackets on the left and right ends of the rubber roller body, and the tail of the bracket is the rotation center axis of the top cover. When the flip cover rotates and falls, the tooth block of the first gear can be well inserted between the teeth of the sixth gear, and the rubber roller body will not be forced to rotate. When closing the cover, the rubber roller body will not rotate due to the meshing of the gears, and the closing feel of the cover is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front cross-sectional structure of the present utility model;

[0015] Figure 2 This is a schematic diagram of the exploded three-dimensional front view structure of the utility model;

[0016] Figure 3 This is a rear view structural diagram of the connection between the second gear and the seventh gear of the present invention;

[0017] Figure 4 This is a front view structural diagram of the connection between the fourth gear and the sixth gear of the present invention;

[0018] Figure 5 This is a side view of the three-dimensional structure of the thermal sheet and spring connection method of the utility model.

[0019] In the figure: 1. Rotating center axis; 2. Bracket; 3. Top cover; 4. First gear; 5. Drive motor; 6. Second gear; 7. Third gear; 8. Fourth gear; 9. Connecting shaft; 10. Fifth gear; 11. Reserved groove; 12. Rubber roller body; 13. Thermal film; 14. Spring; 15. Sixth gear; 16. Seventh gear; 17. Eighth gear. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-5 A structure for preventing the rubber roller from being forced to rotate when pressed down, comprising a rotating central shaft 1 and a bracket 2, the outer portion of the rotating central shaft 1 is sleeved with the bracket 2, a top cover 3 is fixedly connected between the top ends of the bracket 2, a reserved groove 11 is provided on one side of the front end of the bracket 2, a rubber roller body 12 is provided at the bottom end of the top cover 3, a thermal sheet 13 is provided at the bottom end of the rubber roller body 12, a spring 14 is provided at the bottom end of the thermal sheet 13, a connecting shaft 9 is fixedly connected to the front and rear ends of the rubber roller body 12, the front end of the connecting shaft 9 passes through the interior of the reserved groove 11 and is fixedly connected to the first gear 4, the first gear A sixth gear 15 is provided on one side of the bottom end of the bracket 2, and the front end of the sixth gear 15 is fixedly connected to the fourth gear 8. A driving motor 5 is provided on one side of the bottom end of the bracket 2, and the output end of the driving motor 5 is fixedly connected to the seventh gear 16. A second gear 6 is provided on one side of the seventh gear 16, and the rear end of the second gear 6 is fixedly connected to the eighth gear 17. A third gear 7 is provided on one side of the eighth gear 17, and the front end of the third gear 7 is fixedly connected to the fifth gear 10. A fourth gear 8 is provided on one side of the third gear 7, and the rear end of the fourth gear 8 is fixedly connected to the sixth gear 15.

[0022] The sixth gear 15 is a shift gear, meshing with the first gear 4, and meshing with the fifth gear 10 and the fourth gear 8;

[0023] There are four groups of springs 14, which are evenly spaced and distributed at the bottom end of the thermal sheet 13;

[0024] The seventh gear 16 is meshed with the second gear 6, and the eighth gear 17 is meshed with the third gear 7;

[0025] Specifically, if Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, since the first gear 4 and the meshing sixth gear 15 are shifted gears, that is, the tooth tops are relatively sharp, and the gears are reshaped and rounded on both sides of the tooth tops, the two gears can mesh smoothly when they mesh with each other. There are brackets 2 at the left and right ends of the rubber roller body 12, and the tail of the bracket 2 is the rotation center axis 1 of the top cover 3. When the flip cover 3 rotates and falls, the tooth block of the first gear 4 can be well inserted between the teeth of the sixth gear 15, and the rubber roller body will not be forced to rotate. When closing the cover, the rubber roller body 12 will not rotate due to the meshing of the gears, and the closing feel of the cover is good.

[0026] Working principle: When the present invention is in use, first, because the first gear 4 and the meshing sixth gear 15 are shifted gears, that is, the tooth tops are relatively sharp, and then the gears are reshaped and the tooth tops are rounded on both sides, so that the two gears can mesh smoothly when they mesh with each other. There are brackets 2 at the left and right ends of the rubber roller body 12, and the tail of the bracket 2 is the rotation center axis 1 of the top cover 3. When the flip cover 3 rotates and falls, the tooth block of the first gear 4 can be well inserted into the teeth of the sixth gear 15, and the rubber roller body will not be forced to rotate. When closing the cover, the rubber roller body 12 will not rotate due to the meshing of the gears, and the closing feel is good.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A structure for preventing a rubber roller from being forced to rotate when pressed downward, comprising a rotating central shaft (1) and a bracket (2), characterized in that: The outer portion of the rotating central shaft (1) is sleeved with a bracket (2), a top cover (3) is fixedly connected between the top ends of the brackets (2), a reserved groove (11) is provided on one side of the front end of the bracket (2), a rubber roller body (12) is provided on the bottom end of the top cover (3), a thermal sheet (13) is provided on the bottom end of the rubber roller body (12), a spring (14) is provided on the bottom end of the thermal sheet (13), a connecting shaft (9) is fixedly connected to the front and rear ends of the rubber roller body (12), the front end of the connecting shaft (9) passes through the inside of the reserved groove (11) and is fixedly connected to the first gear (4), and a sixth gear (15) is provided on one side of the bottom end of the first gear (4). The front end of the sixth gear (15) is fixedly connected to the fourth gear (8), a driving motor (5) is provided on one side of the bottom end of the bracket (2), the output end of the driving motor (5) is fixedly connected to the seventh gear (16), a second gear (6) is provided on one side of the seventh gear (16), the rear end of the second gear (6) is fixedly connected to the eighth gear (17), a third gear (7) is provided on one side of the eighth gear (17), the front end of the third gear (7) is fixedly connected to the fifth gear (10), a fourth gear (8) is provided on one side of the third gear (7), and the rear end of the fourth gear (8) is fixedly connected to the sixth gear (15).

2. The structure for preventing the rubber roller from being forced to rotate when pressed down according to claim 1, characterized in that: The sixth gear (15) is a shift gear, and the sixth gear (15) is meshed with the first gear (4).

3. The structure for preventing the rubber roller from being forced to rotate when pressed down according to claim 1, characterized in that: The fifth gear (10) is meshed with the fourth gear (8).

4. The structure for preventing the rubber roller from being forced to rotate when pressed down according to claim 1, characterized in that: Four groups of springs (14) are provided, and the springs (14) are distributed at equal intervals at the bottom end of the thermal sheet (13).

5. The structure for preventing the rubber roller from being forced to rotate when pressed down according to claim 1, characterized in that: The seventh gear (16) is meshed with the second gear (6).

6. The structure for preventing the rubber roller from being forced to rotate when pressed down according to claim 1, characterized in that: The eighth gear (17) is meshed with the third gear (7).

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