A Rotating Mechanism for Stamping Ring Patterns and a Stamp Tool Thereof

Abstract

The present invention relates to a rotating mechanism for annular pattern stamping and stamping machine thereof. The rotating mechanism comprises a base (4), a rotating unit (5) rotatably disposed on the base, an operating unit (6) detachably disposed on the rotating unit; wherein, a clamping space is defined between the rotating unit and the operating unit for clamping a stamping carrier; the operating unit is capable of rotating together with the rotating unit and the stamping carrier in the clamping space relative to the base. Compared with the manual mode, the rotating mechanism for annular pattern stamping of the present invention can realize the automatic rotation of the stamping carrier by the operating unit, so it is convenient to operate. In addition, the displacement of the stamping carrier in the stamping process can be avoided by the clamping and positioning of the operating unit and the rotating unit, so that the accuracy of the stamping position and the quality of the stamped pattern are ensured.

Claims

1. A rotating mechanism for annular pattern stamping comprising: a base (4); a rotating unit (5) rotatably disposed on the base (4); an operating unit (6) detachably disposed on the rotating unit (5); wherein, a clamping space is defined between the rotating unit (5) and the operating unit (6) for clamping a stamping carrier; the operating unit (6) is capable of rotating together with the rotating unit (5) and the stamping carrier in the clamping space relative to the base (4).

2. The rotating mechanism of claim 1, wherein the rotating unit (5) has a first clamping plane (50) at the top thereof, and the operating unit (6) has a second clamping plane (60) at the bottom thereof; the first clamping plane (50) is opposed to the second clamping plane (60), and the clamping space is defined between the first clamping plane (50) and the second clamping plane (60).

3. The rotating mechanism of claim 2, wherein the first clamping plane (50) and the second clamping plane (60) are both circular, matched in size and exactly opposed with each other; the operating unit (6) and the rotating unit (5) are capable of rotating circumferentially around a central axis common to the first clamping plane (50) and the second clamping plane (60).

4. The rotating mechanism of claim 2, wherein a plurality of first magnetic pieces (51) are embedded in the first clamping plane (50) of the rotating unit (5), and a plurality of second magnetic pieces (61) are embedded in the second clamping plane (60) of the operating unit (6), the operating unit (6) is detachably attached to the rotating unit (5) by the magnetic attraction between the plurality of first magnetic pieces (51) and the plurality of second magnetic pieces (61).

5. The rotating mechanism of claim 4, wherein the first clamping plane (50) has two first magnetic pieces (51), and the second clamping plane (60) has two second magnetic pieces (61) each corresponding to one of the first magnetic pieces (51), and the two first magnetic pieces (51) are opposite in magnetism, each first magnetic piece (51) is capable of connecting magnetically with the corresponding second magnetic piece (61).

6. The rotating mechanism of claim 5, wherein the two first magnetic pieces (51) are symmetrically disposed around the center of the first clamping plane (50).

7. The rotating mechanism of claim 2, wherein a plurality of antiskid pads (52) are disposed on top of the first clamping plane (50) or the bottom of the second clamping plane (60).

8. The rotating mechanism of claim 2, wherein the operating unit (6) comprises a cylindrical operating knob (62); a bottom surface of the operating knob (62) is defined as the second clamping plane (60), the operating knob (62) has an observation channel (621) penetrating through the operating knob (62) along a central axis of the operating knob (62), and an alignment mechanism is disposed inside the observation channel (621).

9. The rotating mechanism of claim 8, wherein the alignment mechanism comprises a cross-shaped alignment frame (63) centered on the central axis of the operating knob (62).

10. The rotating mechanism of claim 1, further comprising a rotation gear unit (7) being capable of making the rotating unit (5) rotate circumferentially relative to the base (4) at a preset angle.

11. The rotating mechanism of claim 10, wherein the rotation gear unit (7) comprises a gear marble (71), a plurality of gear recesses (531) for receiving the gear marble (71) and a gear spring (73); the rotating unit (5) comprises a disc-shaped rotating tray (53) and a gear ring surface (530) centered on a central axis of the rotating tray (53); the plurality of gear recesses (531) are distributed on the gear ring surface (530) at regular intervals, and the position between two adjacent gear recesses (531) on the gear ring surface (530) forms a plurality of gear teeth (532); when the operating unit (6) rotates, the gear marble (71) is driven to slide circumferentially relative to the gear ring surface (530), and when the gear marble (71) slides into one of the gear recesses (531) on the gear ring surface (530), the gear marble (71) is clamped inside the gear recess (531) by the gear spring (73).

12. The rotating mechanism of claim 11, wherein the base (4) has a circular mounting recess (41), the rotating tray (53) is located inside the mounting recess (41) and is rotatable circumferentially relative to the base (4); the gear ring surface (530) is located on the periphery of the rotating tray (53), the base (4) has a first mounting tunnel (42) for receiving the gear marble (71), the first mounting hole (42) extends to the mounting recess (41) and opens toward the mounting recess (41), the gear marble (71) is located inside the first mounting tunnel (42) and is movable along the first mounting tunnel (42), the gear spring (73) is limited between the gear marble (71) and an end of the first mounting tunnel (42).

13. The rotating mechanism of claim 10, wherein the rotation gear unit (7) comprises a gear marble (71), a plurality of gear recesses (531) for allowing the gear marble (71) to be clamped therein, and a gear spring (73), the rotating unit (5) comprises a disc-shaped rotating tray (53), the gear marble (71) is disposed on the periphery of the rotating tray (53); the base (4) comprises a circular mounting port (43), the rotating tray (53) is embedded in the circular mounting port (43) and can rotate circumferentially in the circular mounting port (43) relative to the base (4), a mounting space (40) communicated with the mounting port (43) is disposed below the rotating tray (53), the gear recesses (531) are located on the bottom surface of the rotating tray (53), the gear recesses (531) are located circumferentially at regular intervals centered on a bottom surface of the rotating tray (53) to form gear rings (534), the gear marble (71) and the gear spring (73) are both disposed in the mounting space (40), the gear marble (71) is exactly opposed to the gear rings (534), and the gear spring (73) urges the gear marble (71) toward the gear rings (534).

14. The rotating mechanism of claim 13, wherein the rotation gear unit (7) further comprises a gear arm (74) horizontally disposed in the mounting space (40), a top surface of the gear arm (74) has a second mounting hole (741) extending vertically, the gear marble (71) is embedded into the second mounting hole (741) and can move in a depth wise direction of the second mounting hole (741), the gear spring (73) is limited between the gear marble (71) and an inner bottom face of the second mounting hole (741).

15. The rotating mechanism of claim 14, wherein at least two concentric gear rings (534) are located on the bottom surface of the rotating tray (53), the gear recesses (531) are disposed on perimeters of the gear rings (534) at uniform intervals, the number of the gear recesses (531) on each gear ring (534) scales directly with the circumferential length of the gear ring (534), the gear arm (74) is capable of moving horizontally in the mounting space (40) to allow the gear marble (71) to vertically urge against the corresponding gear ring (534).

16. The rotating mechanism of claim 15, wherein a gear column (81) is vertically disposed in the mounting space (40), the gear arm (74) has a long strip shape, a first end of the gear arm (74) is pivoted to the gear column (81); during rotation of the gear arm (74) about the gear column (81), the gear marble (71) moves back and forth between different gear rings (534).

17. The rotating mechanism of claim 16, wherein there are two pairs of limiting columns (91, 92) vertically disposed in the mounting space (40), the two pairs of limiting columns (91, 92) are disposed on two sides of the gear arm, respectively, when the gear arm (74) is resisted against one pair of limiting columns (91, 92), the gear marble (71) is urged against the gear ring (534) with the shortest circumference, and, when the gear arm (74) is resisted against the other pair of limiting columns (91, 92), the gear marble (71) is urged against the gear ring (534) with the longest circumference.

18. The rotating mechanism of claim 17, wherein a rotating column (82) is vertically disposed in the mounting space (40), a rotating shaft sleeve (533) vertically extending downward is disposed on a center of a bottom of the rotating tray (53), the rotating shaft sleeve (533) is connected to the rotating column (82) and can rotate around the rotating column (82).

19. The rotating mechanism of claim 18, wherein the second mounting hole (741) is disposed on a middle portion of the gear arm (74), the gear column (81) is located on one side of the rotating column (82), and the middle portion of the gear arm (74) is bent toward one side in the horizontal direction to form an avoidance groove (744) for allowing the rotating column (82) to clamped therein; each pair of limiting columns (91, 92) has a first vertical column (91) and a second vertical column (92), the two first vertical columns (91) are disposed on two sides of the first end of the gear arm (74), respectively; and the two second vertical columns (92) are disposed on two sides of a second end of the gear arm (74), respectively.

20. The rotating mechanism of claim 19, wherein a limiting ring surface (10) corresponding to a rotation trajectory of the gear arm (74) is disposed in the mounting space (40), the limiting ring surface (10) comprises a plurality of limiting grooves (101) corresponding to the gear rings (534), an elastic limiting bump (742) is convexly disposed at the second end of the gear arm (74), and the elastic limiting bump (742) can slide long the limiting ring surface (10) and can be clamped into each limiting groove (101).

21. The rotating mechanism of claim 20, wherein the base (4) is of a hollow structure having an inner cavity which forms the mounting space (40), and the mounting port (43) is formed on a top wall of the base (4); the gear column (81), the limiting columns (91, 92) and the limiting grooves (101) are disposed on an inner bottom surface of the base (4), respectively, and an operating port (44) is formed on an outer sidewall of the base (4), an end portion of the second end of the gear arm (74) is exposed from the operating port (44) and forms an operating end (743) for manual operation.

22. A stamping machine comprising a soleplate (2) and a cover (1) disposed on the soleplate (2); wherein the stamping machine has the rotating mechanism for annular pattern stamping of claim 1.

23. The stamping machine of claim 22, wherein the rotating mechanism is integrated with or detachably connected to the soleplate (2).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG. 1 is a perspective view of a stamping machine according to Embodiment 1 of the present invention;

[0032] FIG. 2 is another perspective view of the FIG. 1;

[0033] FIG. 3 is an exploded view of the stamping machine according to Embodiment 1 of the present invention;

[0034] FIG. 4 is an exploded view of a soleplate according to Embodiment 1 of the present invention;

[0035] FIG. 5 is another exploded view of the FIG. 4;

[0036] FIG. 6 is another exploded view of the soleplate according to Embodiment 1 of the present invention;

[0037] FIG. 7 is a perspective view of a rotating tray according to Embodiment 1 of the present invention;

[0038] FIG. 8 is a partially sectional view of the soleplate according to Embodiment 1 of the present invention;

[0039] FIG. 9 is a perspective view of a stamping machine according to Embodiment 2 of the present invention;

[0040] FIG. 10 is an exploded view of the stamping machine according to Embodiment 2 of the present invention;

[0041] FIG. 11 is a perspective view of a stamping machine according to Embodiment 3 of the present invention;

[0042] FIG. 12 is a partially exploded view of a soleplate according to Embodiment 3 of the present invention;

[0043] FIG. 13 is another perspective view of the FIG. 12;

[0044] FIG. 14 is another partially exploded view of the soleplate according to Embodiment 3 of the present invention;

[0045] FIG. 15 is another perspective view of the FIG. 14;

[0046] FIG. 16 is a perspective view of a rotating tray according to Embodiment 3 of the present invention;

[0047] FIG. 17 is a perspective view of a part of a base according to Embodiment 1 of the present invention;

[0048] FIG. 18 is another perspective view of the FIG. 17.

DETAILED DESCRIPTION OF THE INVENTION

[0049] The present invention will be further described below in detail by embodiments with reference to the accompanying drawings.

Embodiment 1

[0050] FIGS. 1-8 show a first preferred embodiment of the stamping machine for annular pattern stamping of the present invention. The stamping machine comprises a soleplate 2 and a cover plate 1 arranged above the soleplate 2. A stamp (which is generally made of silicone or rubber and has characters and/or patterns on its one side) and a stamping carrier (which is a piece of paper in this embodiment) are clamped between the cover plate 1 and the soleplate 2. In this embodiment, both the cover plate 1 and the soleplate 2 are square, and the rotary mechanism 3 is disposed at one end of the soleplate 2.

[0051] Further, the rotary mechanism 3 comprises a base 4, a rotating unit 5 rotatably disposed on the base 4 and an operating unit 6 detachably disposed on the rotating unit 5; wherein, a clamping space is defined between the rotating unit 5 and the operating unit 6 for clamping a stamping carrier; the operating unit 6 is capable of rotating together with the rotating unit 5 and the stamping carrier in the clamping space relative to the base 4. In this embodiment, the base 4 is integrated with the soleplate 2, that is, one end of the soleplate 2 extends outward to form a semicircle which is defined as the base 4. The clamping space is used for clamping the stamping carrier.

[0052] It can be seen that the clamping space is defined between the rotating unit 5 and the operating unit 6. Since the rotating unit 5 is detachably connected to the operating unit 6, it is convenient to place the stamping carrier in the clamping space. In addition, in a state where the operating unit 6 rotates, the operating unit 6, the rotating unit 5 and the stamping carrier in the clamping space can synchronously rotate relative to the base 4, that is, the rotation of the stamping carrier can be realized by rotating the operating unit 6, so that the desired annular pattern is repeatedly stamped and formed on the stamping carrier. Compared with the manual mode, the rotating mechanism for annular pattern stamping of the present invention can realize the automatic rotation of the stamping carrier by the operating unit 6, so it is convenient to operate. In addition, the displacement of the stamping carrier in the stamping process can be avoided by the clamping and positioning of the operating unit 6 and the rotating unit 5, so that the accuracy of the stamping position and the quality of the stamped pattern are ensured.

[0053] Further, the rotating unit 5 has a first clamping plane 50 at the top thereof, and the operating unit 6 has a second clamping plane 60 at the bottom thereof; the first clamping plane 50 is opposed to the second clamping plane 60, and the clamping space is defined between the first clamping plane 50 and the second clamping plane 60. The stamping carrier is generally a planar article, such as paper, so that the clamping space defined by the upper and lower planes can better clamp the stamping carrier. Preferably, the first clamping plane 50 and the second clamping plane 60 are both circular, matched in size and exactly opposed with each other; the operating unit 6 and the rotating unit 5 are capable of rotating circumferentially around a central axis common to the first clamping plane 50 and the second clamping plane 60. Thus, the synchronous rotation of the operating unit 6, the rotating unit 5 and the stamping carrier can be better realized.

[0054] The detachable connection of the rotating unit 5 and the operating unit 6 is specifically implemented in various ways. In this embodiment, a plurality of first magnetic pieces 51 are embedded in the first clamping plane 50 of the rotating unit 5, the surface exposed of the first magnetic pieces 51 is flush with or approximately flush with the first magnetic pieces 51; and a plurality of second magnetic pieces 61 are embedded in the second clamping plane 60 of the operating unit 6, the surface exposed of second clamping plane 60 is flush with or approximately flush with the second magnetic pieces 60. The operating unit 6 is detachably attached to the rotating unit 5 by the magnetic attraction between the plurality of first magnetic pieces 51 and the plurality of second magnetic pieces 61. The rotating unit 5 and the operating unit 6 are detachably connected by the magnetic attraction, so it is convenient for disassembly, and it is convenient to load or unload the stamping carrier. Specifically, the first clamping plane 50 has two first magnetic pieces 51, and the two first magnetic pieces 51 are symmetrically disposed around the center of the first clamping plane 50. The second clamping plane 60 has two second magnetic pieces 61 each corresponding to one of the first magnetic pieces 51, and the two second magnetic pieces 61 are symmetrically disposed around the center of the second clamping plane 60, and the two first magnetic pieces 51 are opposite in magnetism, each first magnetic piece 51 is capable of connecting magnetically with the corresponding second magnetic piece 61. Thus, the corresponding assembly positions of the operating unit 6 and the rotating unit 5 can be limited, and the both can be assembled more accurately. In this embodiment, each first magnetic piece 51 and each second magnetic piece 61 are magnets. Of course, one of each first magnetic piece 51 and each second magnetic piece 61 may be a magnet, while the other thereof is a metal plate.

[0055] Further, a plurality of antiskid pads 52 is disposed on top of the first clamping plane 50 or the bottom of the second clamping plane 60. Thus, by arranging the antiskid pads 52, the friction force between each clamping plane and the stamping carrier is increased, and the stamping carrier can be better driven to rotate synchronously. In this embodiment, the antiskid pads 52 are arranged on the first clamping plane 50, and the two antiskid pads 52 which are circumferentially spaced from the two first magnetic pieces 51. Preferably, the second magnetic pieces 61 have antiskid gaskets 611 arranged on the bottom of the second magnetic pieces 61.

[0056] Specifically, the operating unit 6 comprises a cylindrical operating knob 62, a bottom surface of the operating knob 62 is defined as the second clamping plane 60, the operating knob 62 has an observation channel 621 penetrating through the operating knob 62 along a central axis of the operating knob 62, and an alignment mechanism is disposed inside the observation channel 621. In this embodiment, the alignment mechanism comprises a cross-shaped alignment frame 63 centered on the central axis of the operating knob 62. The selected position of the stamping carrier can be positioned by the alignment frame 63, so that the pattern can be stamped at the correct position.

[0057] To enable the user to obtain annular patterns at a specific angular interval, the rotating mechanism also comprises a rotation gear unit 7 which enables the rotating unit 5 to rotate circumferentially relative to the base 4 at a preset angle. In this embodiment, the rotation gear unit 7 comprises a gear marble 71, a plurality of gear recesses 531 for receiving the gear marble 71 and a gear spring 73; the rotating unit 5 comprises a disc-shaped rotating tray 53 and a gear ring surface 530 centered on a central axis of the rotating tray 53; the plurality of gear recesses 531 are distributed on the gear ring surface 530 at regular intervals, and the position between two adjacent gear recesses 531 on the gear ring surface 530 forms a plurality of gear teeth 532; when the operating unit 6 rotates, the gear marble 71 is driven to slide circumferentially relative to the gear ring surface 530, and when the gear marble 71 slides into one of the gear recesses 531 on the gear ring surface 530, the gear marble 71 is clamped inside the gear recess 531 by the gear spring 73. Thus, when the gear marble slides into a next gear recess, the gear marble can slide into this gear recess under the action of an elastic force of the gear spring. The included angle between adjacent gear recesses which is also the included angle between repeated patterns in the stamped annular pattern; and, when the gear marble is clamped into this gear recess, the rotating tray stops rotating, and the stamp stamps a pattern on the stamping carrier. As the gear marble is slidable on the gear ring surface, the stamp stamps repetitively to form the annular pattern.

[0058] In this embodiment, the included angle between adjacent gear recesses 531 is 15? (that is, an annular patter with an included angle of 15? can be obtained), and annular patterns with an included angle of 2?15?, 3?15?, 4?15?, 5?15?, 6?15?, etc. can be obtained by controlling the sliding distance of the gear marble 71 along the gear ring surface 530, respectively.

[0059] Further, the base 4 has a circular mounting recess 41, the rotating tray 53 is located inside the mounting recess 41 and is rotatable circumferentially relative to the base 4; the gear ring surface 530 is located on the periphery of the rotating tray 53, the base 4 has a first mounting tunnel 42 for receiving the gear marble 71, the first mounting hole 42 extends to the mounting recess 41 and opens toward the mounting recess 41, the gear marble 71 is located inside the first mounting tunnel 42 and is movable along the first mounting tunnel 42, the gear spring 73 is limited between the gear marble 71 and an end of the first mounting tunnel 42. On one hand, the gear marble 71 can be mounted stably; on the other hand, it is advantageous for the gear marble 71 to be slidable along the gear ring surface 530 and successively slide into each gear recess 531.

[0060] In addition, in this embodiment, the cover plate 1 away from the rotary mechanism 3 have positioning holes 11 formed on two sides of one end of the cover plate 1, respectively, and the soleplate 2 comprises a plurality of first elastic positioning columns 21, the first elastic positioning columns 21 can be inserted into the each corresponding positioning hole 11, respectively; and, in a state where the cover plate 1 is pressed down, each first elastic positioning column 21 is compressed and drives the cover plate 1 to move up. Meanwhile, the cover plate 1 comprises a plurality of second elastic positioning columns 12 on two sides of the bottom surface of the other end of the cover plate 1, respectively; and, in a state where the cover plate 1 is pressed down, each second elastic positioning column 12 also drives the cover plate 1 to move up.

[0061] During the stamping process, the stamping carrier is firstly placed on the upper surface of the soleplate 2, and one end of the stamping carrier is clamped in the clamping space. The stamp is placed at a position where stamping needs to be performed, the cover plate 1 is covered, positioned and then pressed down, each elastic positioning column is compressed, and the stamp attaches the lower surface of the cover plate 1. When the pressure applied to the cover plate 1 is removed, the cover plate 1 is reset upward under the action of the elastic force of each elastic positioning column, the cover plate 1 is taken up, and the desired ink is coated on the stamp. The cover plate 1 is covered again, positioned and pressed, each elastic positioning column is compressed, and the pattern on the stamp is uniformly stamped on the stamping carrier. By rotating the operating unit 6, the rotating unit 5 and the stamping carrier rotate synchronously with the operating unit 6. When rotating to a desired position, the operating unit 6 stops rotating, and the cover plate 1 is pressed down, and the pattern on the stamp is stamped on the stamping carrier again. The above operations are repeated by 360? to obtain the annular pattern required by the user.

Embodiment 2

[0062] FIGS. 9-10 show a second embodiment of the stamping machine. Compared with Embodiment 1, the stamping machine of this embodiment has the difference that, in this embodiment, the rotary mechanism 3 is detachably connected to the soleplate 2, that is, the base 4 of the rotary mechanism 3 is detachably connected to one end of the soleplate 2. Thus, different types of soleplates 2 and cover plates 1 can be replaced as required to satisfy the stamping requirements of different patterns. Specifically, in this embodiment, a buckling bump 45 horizontally extends outward from the end of the base 4; a buckling hole 451 is formed on the buckling bump 45; a buckling recess 21 for receiving the buckling bump 45 is formed on the bottom surface of one end of the soleplate 2; and, a vertical buckling convex column 22 can be clamped into the buckling hole 451 is arranged in the buckling recess 21.

Embodiment 3

[0063] FIGS. 11-18 show a third embodiment of the stamping machine. Compared with Embodiment 1, the stamping machine of this embodiment has the difference that, in this embodiment, the base 4 comprises a circular mounting port 43, the rotating tray 53 is embedded in the circular mounting port 43 and can rotate circumferentially in the circular mounting port 43 relative to the base 4, a mounting space 40 communicated with the mounting port 43 is disposed below the rotating tray 53, the gear recesses 531 are located on the bottom surface of the rotating tray 53, the gear recesses 531 are located circumferentially at regular intervals centered on a bottom surface of the rotating tray 53 to form gear rings 534, the gear marble 71 and the gear spring 73 are both disposed in the mounting space 40, the gear marble 71 is exactly opposed to the gear rings 534, and the gear spring 73 urges the gear marble 71 toward the gear rings 534.

[0064] Furthermore, the rotation gear unit 7 further comprises a gear arm 74 horizontally arranged in the mounting space 40; a second mounting hole 741 extending vertically is formed on a top surface of the gear arm 74; the gear marble 71 is embedded into the second mounting hole 741 and can move in the depth direction of the second mounting hole 741; and, the gear spring 73 is limited between the gear marble 71 and an inner bottom face of the second mounting hole 74. The gear marble 71 moves along the gear ring 534. When the gear marble 71 is clamped into a gear groove 531, the rotating tray 53 stops rotating, and the stamp stamps a pattern on the stamping carrier. When the gear marble 71 resists against the gear teeth 532, the gear spring 73 is compressed and drives the gear marble 71 to move up. Thus, when the gear marble 71 slides into a next gear recess 531, the gear marble 71 can be clamped into this gear recess 531 under the action of the elastic force of the gear spring 73.

[0065] Furthermore, at least two concentric gear rings 534 are located on the bottom surface of the rotating tray 53, the gear recesses 531 are disposed on perimeters of the gear rings 534 at uniform intervals, the number of the gear recesses 531 on each gear ring 534 scales directly with the circumferential length of the gear ring 534, the gear arm 74 is capable of moving horizontally in the mounting space 40 to allow the gear marble 71 to vertically urge against the corresponding gear ring 534, thereby shifting gears. Thus, the gear marble 74 can face the different gear rings 534 by moving the gear arm 534, so that the included angle between adjacent repeated patterns in the stamped annular pattern can be changed. Specifically, in this embodiment, if there are five gear springs 534, there are also five adjustable gears corresponding to the gear arm 74: 4th gear (with an included angle of 90?), 6th gear (with an included angle of 60?), 8th gear (with an included angle of 45?), 12th gear (with an included angle of 30?), and 24th gear (with an included angle of 15?).

[0066] To better realize the rotation of the gear arm 74, a gear column 81 is vertically arranged in the mounting space 40; the gear arm 74 has a long strip shape, a first end of the gear arm 74 is pivoted to the gear column 81; during rotation of the gear arm 74 about the gear column 81, the gear marble 71 moves back and forth between different gear rings 534, so that the gear marble 71 can be adjusted to face the corresponding gear ring 534 as required to obtain an annular pattern with the desired included angle.

[0067] Furthermore, to limit the act of the gear arm 74 and avoid the situation where the gear marble 71 slides out the gear rings 534 during the gear shifting process and cannot slide between different gear rings 534, there are two pairs of limiting columns 91, 92 vertically disposed in the mounting space 40, the two pairs of limiting columns 91, 92 are disposed on two sides of the gear arm, respectively, when the gear arm 74 is resisted against one pair of limiting columns 91, 92, the gear marble 71 is urged against the gear ring 534 with the shortest circumference, and, when the gear arm 74 is resisted against the other pair of limiting columns 91, 92, the gear marble 71 is urged against the gear ring 534 with the longest circumference. In addition, a rotating column 82 is vertically disposed in the mounting space 40, a rotating shaft sleeve 533 vertically extending downward is disposed on a center of a bottom of the rotating tray 53, the rotating shaft sleeve 533 is connected to the rotating column 82 and can rotate around the rotating column 82, so that the rotating tray 53 can rotate more stably.

[0068] Specifically, in this embodiment, the second mounting hole 741 is disposed on a middle portion of the gear arm 74, the gear column 81 is located on one side of the rotating column 82, and the middle portion of the gear arm 74 is bent toward one side in the horizontal direction to form an avoidance groove 744 for receiving the rotating column 82; each pair of limiting columns 91, 92 has a first vertical column 91 and a second vertical column 92, the two first vertical columns 91 are disposed on two sides of the first end of the gear arm 74, respectively; and the two second vertical columns 92 are disposed on two sides of a second end of the gear arm 74, respectively. Thus, the rotation of the gear arm 74 can be better limited, the movement of the gear marble 71 between different gear rings 534 can be better limited, and the accuracy of gear shifting can be ensured.

[0069] Furthermore, a limiting ring surface 10 corresponding to a rotation trajectory of the gear arm 74 is arranged in the mounting space 40; the limiting ring surface 10 comprises a plurality of limiting grooves 101 corresponding to the gear rings 534; an elastic limiting bump 742 is convexly disposed at the second end of the gear arm 74; and, the elastic limiting bump 742 can slide long the limiting ring 10 and can be clamped into each limiting groove 101. On one hand, the gear arm 74 can be limited at the desired gear through the connection between the elastic limiting bump 742 and the corresponding limiting groove 101; on the other hand, it is convenient for the user to perform a gear shifting operation on the gear arm 74. In this embodiment, an elastic piece (e.g., a spring leaf) is arranged at the second end of the gear arm 74, and the middle portion of the elastic piece is bent downward to form the elastic limiting bump 742. The mounting space 40 is defined in various ways in the present invention. In this embodiment, the base 4 is of a hollow structure having an inner cavity which forms the mounting space 40, and the mounting port 43 is formed on a top wall of the base 4; the gear column 81, the limiting columns 91, 92 and the limiting grooves 101 are formed on an inner bottom surface of the base 4, respectively, and an operating port 44 is formed on an outer sidewall of the base 4; and, an end portion of the second end of the gear arm 74 is exposed from the operating port 44 and forms an operating end 743 for manual operation. Therefore, the inner structure of the base 4 can be simpler, and it can be more convenient for the user to perform the gear shifting.