CN109663338B - Cam type mahjong machine tile lifting and pushing mechanism - Google Patents
Cam type mahjong machine tile lifting and pushing mechanism Download PDFInfo
- Publication number
- CN109663338B CN109663338B CN201811297641.2A CN201811297641A CN109663338B CN 109663338 B CN109663338 B CN 109663338B CN 201811297641 A CN201811297641 A CN 201811297641A CN 109663338 B CN109663338 B CN 109663338B
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- shaft
- mahjong machine
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- 230000007246 mechanism Effects 0.000 title claims abstract description 45
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000000670 limiting effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 8
- 230000002829 reductive effect Effects 0.000 description 9
- 230000005484 gravity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F9/00—Games not otherwise provided for
- A63F9/20—Dominoes or like games; Mah-Jongg games
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F9/00—Games not otherwise provided for
- A63F9/20—Dominoes or like games; Mah-Jongg games
- A63F2009/205—Mah-jongg games
Abstract
The invention belongs to the field of tile lifting mechanisms of mahjong machines, and relates to a tile lifting and pushing mechanism of a cam type mahjong machine. The card lifting mechanism solves the technical problems that a card lifting mechanism in the prior art is complex in structure and unstable in action. The mahjong tile lifting device comprises a tile lifting plate hinged to a mahjong machine, an incomplete gear is arranged below the tile lifting plate, a cam protruding upwards is coaxially arranged on the incomplete gear, a follower connected with the cam is arranged on the tile lifting plate, and a cam transmission structure is arranged between the cam and the incomplete gear. Compared with the prior art, the invention has the advantages of simple structure and good support stability, and one motor drives the card lifting and pushing mechanism, thereby greatly reducing the action error rate.
Description
Technical Field
The invention belongs to the technical field of mahjong machine tile lifting mechanisms, and particularly relates to a cam type mahjong machine tile lifting and pushing mechanism.
Background
The automatic mahjong machine only needs to operate the working procedure of the full-automatic mahjong table, and then the mahjong tiles built in the mahjong machine in advance are lifted to the table top through the tile pushing and lifting machine in the machine body, so that the automatic mahjong machine is fast and labor-saving, and entertainment is enhanced. Wherein the tile lifting mechanism is a main component in the automatic mahjong machine.
In the prior art, a crank rocker mechanism is generally adopted in a tile lifting mechanism of a mahjong machine, for example, chinese patent literature discloses a tile lifting mechanism [ CN107469341A ] of the mahjong machine, which comprises a tile accumulating seat with a circular arc tile accumulating groove, a rocker and a pushing rod, wherein the output end of the tile accumulating groove is in butt joint with the rocker, a driving motor and an incomplete gear set are arranged at the center of the tile accumulating seat, the incomplete gear set comprises a driving gear and a driven gear which are meshed with each other, the driving gear is sleeved outside an output shaft of the driving motor, a notch is formed in the driving gear, the top end of the driven gear extends upwards to form a connecting part, the connecting part is fixedly connected with one end of the pushing rod, the driving gear is also connected with a cam mechanism for controlling the rocker to do periodic lifting movement, and when the tile moves to the rocker completely, the cam mechanism controls the rocker to do lifting movement, and a position sensor for detecting the position of the tile is arranged below the driven gear.
In the action process of the crank mechanism, parts are easy to damage due to friction among the mechanisms, action faults occur, and the later maintenance cost is higher due to the fact that the mechanisms are complex.
Disclosure of Invention
The invention aims to solve the problems and provides a tile lifting and pushing mechanism of a cam type mahjong machine.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the tile lifting and pushing mechanism of the cam type mahjong machine comprises a tile lifting plate hinged to the mahjong machine, an incomplete gear is arranged below the tile lifting plate, a cam protruding upwards is coaxially arranged on the incomplete gear, a follower connected with the cam is arranged on the tile lifting plate, and a cam unidirectional transmission structure is arranged between the cam and the incomplete gear.
In the tile lifting and pushing mechanism of the cam type mahjong machine, the cam unidirectional transmission structure comprises a start-stop groove arranged on one side of the incomplete gear close to the cam, one side of the cam close to the incomplete gear is fixedly connected with a driving shaft, and the driving shaft is slidably connected in the start-stop groove.
In the tile lifting and pushing mechanism of the cam mahjong machine, the start-stop groove is circular arc-shaped and is concave downwards, and the driving shaft is cylindrical and can be clamped in the start-stop groove in a sliding manner.
In the above-mentioned cam-type mahjong machine rises tablet pushing mechanism, the cam includes the cam base that is the disc, the cam base on be provided with the spacing axle of coaxial setting, spacing epaxial being provided with the camshaft hole of coaxial setting, the camshaft hole in wear to be equipped with the gear shaft of connection on incomplete gear.
In the tile lifting and pushing mechanism of the cam type mahjong machine, the outer eave of the cam base is provided with the cam block protruding upwards, and the top of the cam block is provided with the resting plane.
In the tile lifting and pushing mechanism of the cam mahjong machine, a one-way bearing is arranged between the cam shaft hole and the gear shaft, and a bearing is arranged in front of the incomplete gear and the gear shaft.
In the tile lifting and pushing mechanism of the cam type mahjong machine, a positioning circular groove is formed in one side, close to the cam, of the incomplete gear, and the cam base can be rotatably clamped in the positioning circular groove.
In the above-mentioned cam mahjong machine rises tablet pushing mechanism, incomplete gear includes first gear portion and second gear portion, first gear portion set up in second gear portion top, first gear portion be connected with rotary driver, rotary driver output be provided with drive gear and first gear portion meshing connection.
In the tile lifting and pushing mechanism of the cam type mahjong machine, the second gear part is an incomplete gear, the second gear part can be connected with a tile pushing reel in a meshed mode, the tile pushing reel can be rotatably connected to the mahjong machine, the tile pushing reel is provided with a driving gear which is coaxially arranged, and the driving gear is connected with the second gear part in a meshed mode.
In the tile lifting and pushing mechanism of the cam type mahjong machine, the driven piece comprises a cantilever shaft arranged below the tile lifting plate, the cantilever shaft is fixedly connected with the tile lifting plate, one end, close to the cam, of the cantilever shaft is provided with a driven wheel, and the driven wheel can be connected with the cam.
Compared with the prior art, the invention has the advantages that.
1. The card lifting plate is directly connected with the cam through the cantilever beam serving as the driven piece, the mechanism is simple, the cantilever beam is always attached to the cam, impact abrasion is small, noise is greatly reduced, and the service life of parts is prolonged.
The cam protrudes upwards, when the card lifting plate needs to be jacked up and the tabletop is level, the support is provided for the card lifting plate, the card lifting plate is not required to be maintained by external force, and the energy loss is reduced.
The cam is provided with a cam driving mechanism and a one-way bearing, and after the card lifting is completed, the card lifting plate is ensured to be kept static.
Drawings
Fig. 1 is a schematic view of the structure provided by the present invention.
Fig. 2 is a schematic view of another angle provided by the present invention.
Fig. 3 is a schematic view of another angle structure provided by the present invention.
Fig. 4 is a cross-sectional view provided by the present invention.
Fig. 5 is a schematic view of an incomplete gear structure provided by the present invention.
In the figure, a card lifting plate 1, an incomplete gear 2, a cam 3, a follower 4, a cam unidirectional transmission structure 5, a start-stop groove 6, a driving shaft 7, a cam base 8, a limiting shaft 9, a cam shaft hole 10, a gear shaft 11, a cam block 12, a positioning circular groove 13, a first gear part 14, a second gear part 15, a rotary driver 16, a transmission gear 17, a card pushing reel 18, a driving gear 19, a cantilever shaft 20 and a driven wheel 21.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-2, the tile lifting and pushing mechanism of the cam type mahjong machine comprises a tile lifting plate 1 hinged on the mahjong machine, an incomplete gear 2 is arranged below the tile lifting plate 1, a cam 3 protruding upwards is coaxially arranged on the incomplete gear 2, a follower 4 connected with the cam 3 is arranged on the tile lifting plate 1, and a cam unidirectional transmission structure 5 is arranged between the cam 3 and the incomplete gear 2. Preferably, the incomplete gear 2 comprises a first gear part 14 and a second gear part 15, the first gear part 14 is arranged above the second gear part 15, the first gear part 14 is connected with a rotary driver 16, the output end of the rotary driver 16 is provided with a transmission gear 17, and the transmission gear 17 is in meshed connection with the first gear part 14.
When the mahjong tiles are stacked in the tile pushing track, the rotary driver 16 drives the incomplete gear 2 to rotate through the transmission gear 17, the incomplete gear 2 drives the cam 3 to rotate through the cam unidirectional transmission structure 5, and the follower 4 is displaced along the cam curved surface along with the rotation of the cam 3. When the cam low-point curved surface moves to the lower part of the follower 4, the follower 4 moves to the low point along the cam curved surface of the cam 3, the tile lifting plate 1 loses the high-position support of the follower 4, and the tile lifting plate 1 is downwards turned over at the hinge point with the mahjong machine under the action of gravity and is connected with the tile pushing track, so that the mahjong tile smoothly enters the tile lifting plate under the action of the tile pushing mechanism. In the process of downwards overturning the card lifting plate 1, the driven piece 4 is always attached to the cam, so that impact abrasion is avoided, and noise is generated. Meanwhile, the follower 4 preferably comprises a cantilever shaft 20 arranged below the card lifting plate 1, the cantilever shaft 20 is fixedly connected with the card lifting plate 1, one end of the cantilever shaft 20, which is close to the cam 3, is provided with a driven wheel 21, and the driven wheel 21 can be connected with the cam 3. The friction between the driven piece 4 and the cam 3 is reduced through the driven wheel 21, so that the abrasion of parts is reduced, and the service life of the parts is prolonged.
Along with the mahjong tile lifting process, the high point of the cam 3 moves to the lower part of the follower 4, the follower 4 is supported in a high position, and the mahjong tile lifting plate carries the mahjong tile to lift and be flush with the tabletop. After the card lifting process is completed, the high point of the cam 3 is directly supported below the driven piece, compared with the transmission with the curved edge, the interaction force between each part is reduced, the part is prevented from being damaged under the action of external force, in the embodiment, the card lifting plate 1 and the mahjong tiles are directly pressed on the cam by the gravity, the stress is single, the risk of part damage and dislocation risk after damage are reduced, and the stability of the system is greatly improved.
The cam unidirectional transmission structure 5 comprises a start-stop groove 6 arranged on one side of the incomplete gear 2 close to the cam 3, wherein a driving shaft 7 is fixedly connected to one side of the cam 3 close to the incomplete gear 2, and the driving shaft 7 is slidably connected in the start-stop groove 6. The start-stop groove 6 is arc-shaped and concave downwards, and the driving shaft 7 is cylindrical and can be slidably clamped in the start-stop groove 6. The incomplete gear 2 is driven by the rotary driver 16 to rotate, when the driving shaft 7 is positioned in the start-stop groove 6 and is not contacted with the two ends of the start-stop groove 6, the cam 3 is kept static, namely the tile lifting plate 1 is kept unchanged in the original state, the incomplete gear 2 rotates to drive the tile pushing reel to rotate, and the tile pushing mechanism is driven to push the mahjong tiles to enter the tile lifting plate. When the rotation angle of the incomplete gear 2 driven by the rotation driver 16 exceeds the radian of the start-stop groove 6, the driving shaft 7 is in contact with one end of the start-stop groove 6, and the start-stop groove 6 pushes the cam 3 to rotate through the driving shaft 7, so that the follower 4 moves along the cam curved surface of the cam 3, and the mahjong tile lifting plate acts to lift the mahjong tile to be flush with the table top.
Preferably, the cam 3 comprises a disc-shaped cam base 8, a limiting shaft 9 coaxially arranged is arranged on the cam base 8, a cam shaft hole 10 coaxially arranged is arranged on the limiting shaft 9, and a gear shaft 11 connected to the incomplete gear 2 is arranged in the cam shaft hole 10 in a penetrating manner. The limiting shaft 9 limits the position of the cam 3 to be coaxial with the incomplete gear 2.
Further, the outer eave of the cam base 8 is provided with a cam block 12 protruding upwards, and the top of the cam block 12 is provided with a rest plane. When the follower 4 is located on the rest plane, the follower 4 rises to the highest point, at which point the card lifting plate 1 rotates upwards to the highest point flush with the table top. The gravity of the tile lifting plate 1 and the mahjong tiles on the tile lifting plate 1 are directly applied to the rest plane on the cam block 12, so that the gravity is completely vertical and downward, namely, the gravity of the tile lifting plate 1 and the mahjong tiles on the tile lifting plate 1 cannot generate component force to push the cam 3 to rotate, the mechanism is kept still, and the tile lifting plate 1 is stably leveled on a tabletop.
Further, a one-way bearing is provided between the cam shaft hole 10 and the gear shaft 11, further preventing the cam 3 from rotating in the reverse direction, so that the follower 4 is out of the rest plane to tilt the card lifting plate 1. The bearings are arranged in front of the incomplete gear 2 and the gear shaft 11, so that the incomplete gear 2 rotates smoothly, and the failure rate is reduced.
Furthermore, a positioning circular groove 13 is arranged on one side of the incomplete gear 2 close to the cam 3, and the cam base 8 is rotatably clamped in the positioning circular groove 13. The position of the cam 3 is further defined so that the cam 3 is maintained in a coaxial positional relationship with the incomplete gear 2.
Preferably, the second gear portion 15 is an incomplete gear, the second gear portion 15 is in meshed connection with a tile pushing reel 18, the tile pushing reel 18 is rotatably connected to the mahjong machine, a coaxially arranged driving gear 19 is arranged on the tile pushing reel 18, and the driving gear 19 is in meshed connection with the second gear portion 15. Preferably, the start-stop groove 6 is provided on the same side as the second gear portion 15, and the card-pushing reel 18 is provided on the side of the incomplete gear 2 away from the follower 4.
When the rest plane of the cam block 12 is far away from the follower 4, the card lifting plate 1 loses the support of the cam block 12 and is connected with the card pushing track, the second gear part 15 is meshed with the driving gear 19 for transmission, the rotation driver 16 drives the incomplete gear 2 to rotate, at the moment, the driving shaft 7 is in a state of not contacting with two ends of the start-stop groove 6 in the start-stop groove 6 but keeping static, namely, the card lifting plate 1 ensures connection with the card pushing track, the incomplete gear 2 drives the card pushing reel 18 to rotate, and the steel wire rope wound on the card pushing reel 18 pulls the card pushing block to push the mahjong into the card lifting plate. When the rotary driver 16 drives the incomplete gear 2 to rotate and enables the driving shaft 7 to be in contact with one end of the start-stop groove 6, the cam 3 follows the incomplete gear 2 to rotate, the follower 4 ascends along the cam curved surface of the cam 3, and the tile lifting board 1 carries mahjong tiles to be lifted to be flush with a tabletop. While the second gear portion 15 is disengaged from the drive gear 19 and the card pushing reel 18 remains stationary. The rotary drive 16 may be a stepper motor or a servo motor.
It is also possible for a person skilled in the art to connect the rotary drive 16 directly with the incomplete gear 2, so that the first gear part 14 is omitted.
The card lifting and pushing mechanism is driven by one motor, so that the monitoring mechanism is reduced, the action error rate is greatly reduced, and the stability of the mechanism is improved.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms of the card lifting plate 1, the incomplete gear 2, the cam 3, the follower 4, the cam unidirectional transmission structure 5, the start-stop groove 6, the drive shaft 7, the cam base 8, the limit shaft 9, the cam shaft hole 10, the gear shaft 11, the cam block 12, the positioning round groove 13, the first gear portion 14, the second gear portion 15, the rotary driver 16, the transmission gear 17, the card pushing reel 18, the drive gear 19, the cantilever shaft 20, the driven wheel 21, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (7)
1. The tile lifting and pushing mechanism of the cam type mahjong machine comprises a tile lifting plate (1) hinged on the mahjong machine, and is characterized in that,
an incomplete gear (2) is arranged below the card lifting plate (1), a cam (3) protruding upwards is coaxially arranged on the incomplete gear (2), a follower (4) connected with the cam (3) is arranged on the card lifting plate (1), and a cam unidirectional transmission structure (5) is arranged between the cam (3) and the incomplete gear (2);
the cam unidirectional transmission structure (5) comprises a start-stop groove (6) arranged on one side of the incomplete gear (2) close to the cam (3), one side of the cam (3) close to the incomplete gear (2) is fixedly connected with a driving shaft (7), and the driving shaft (7) is slidably connected in the start-stop groove (6);
the incomplete gear (2) comprises a first gear part (14) and a second gear part (15), the first gear part (14) is arranged above the second gear part (15), the first gear part (14) is connected with a rotary driver (16), the output end of the rotary driver (16) is provided with a transmission gear (17), and the transmission gear (17) is in meshed connection with the first gear part (14);
the follower (4) comprises a cantilever shaft (20) arranged below the card lifting plate (1), the cantilever shaft (20) is fixedly connected with the card lifting plate (1), one end, close to the cam (3), of the cantilever shaft (20) is provided with a driven wheel (21), and the driven wheel (21) can be connected with the cam (3).
2. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 1, wherein,
the start-stop groove (6) is arc-shaped and is concave downwards, and the driving shaft (7) is cylindrical and is slidably clamped in the start-stop groove (6).
3. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 2, wherein,
the cam (3) comprises a disc-shaped cam base (8), a limiting shaft (9) which is coaxially arranged is arranged on the cam base (8), a cam shaft hole (10) which is coaxially arranged is arranged on the limiting shaft (9), and a gear shaft (11) which is connected to the incomplete gear (2) is arranged in the cam shaft hole (10) in a penetrating mode.
4. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 3, wherein,
the cam base (8) outer eaves be provided with protruding cam piece (12) upwards, cam piece (12) top be provided with the rest plane.
5. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 4, wherein,
a one-way bearing is arranged between the cam shaft hole (10) and the gear shaft (11), and a bearing is arranged in front of the incomplete gear (2) and the gear shaft (11).
6. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 5, wherein,
one side of the incomplete gear (2) close to the cam (3) is provided with a positioning circular groove (13), and the cam base (8) is rotatably clamped in the positioning circular groove (13).
7. The tile lifting and pushing mechanism of the cam type mahjong machine according to claim 1, wherein,
the mahjong tile pushing device is characterized in that the second gear part (15) is an incomplete gear, the second gear part (15) can be connected with a mahjong tile pushing reel (18) in a meshing mode, the mahjong tile pushing reel (18) can be rotatably connected to a mahjong tile mahjong machine, a driving gear (19) which is coaxially arranged is arranged on the mahjong tile pushing reel (18), and the driving gear (19) can be connected with the second gear part (15) in a meshing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297641.2A CN109663338B (en) | 2018-11-01 | 2018-11-01 | Cam type mahjong machine tile lifting and pushing mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811297641.2A CN109663338B (en) | 2018-11-01 | 2018-11-01 | Cam type mahjong machine tile lifting and pushing mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109663338A CN109663338A (en) | 2019-04-23 |
| CN109663338B true CN109663338B (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811297641.2A Active CN109663338B (en) | 2018-11-01 | 2018-11-01 | Cam type mahjong machine tile lifting and pushing mechanism |
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| CN (1) | CN109663338B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110237527B (en) * | 2019-05-13 | 2024-02-20 | 松冈机电（中国）有限公司 | Card storage and lifting device |
| CN111450519B (en) * | 2020-04-28 | 2023-05-02 | 浙江松乐机电有限公司 | Integrated linkage type tile pushing and lifting mechanism of mahjong machine |
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| CN101569794A (en) * | 2008-11-21 | 2009-11-04 | 崔立成 | Double mah-jongg tile pushing and raising mechanism for eight-port automatic mah-jongg table |
| CN201591967U (en) * | 2009-12-29 | 2010-09-29 | 徐朗 | Double card-pushing and card-rising mechanism of eight-hole automatic mahjong table |
| CN201880353U (en) * | 2010-12-06 | 2011-06-29 | 徐朗 | Small size biplane cam tile pushing-boosting mechanism of ultrathin eight-mouth automatic mahjong table |
| CN205084375U (en) * | 2015-09-28 | 2016-03-16 | 杭州速控软件有限公司 | Mahjong machine pushes away tablet motor at head part transmission structure |
| CN107469341A (en) * | 2017-10-13 | 2017-12-15 | 林培 | A kind of mahjong machine rising mechanism |
| CN209302158U (en) * | 2018-11-01 | 2019-08-27 | 王彬 | Cam-type mahjong machine rising piece-pushing mechanism |
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2018
- 2018-11-01 CN CN201811297641.2A patent/CN109663338B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| CN101077456A (en) * | 2007-06-18 | 2007-11-28 | 张传征 | Push-rising mechanism for automatic machine for mohjony game |
| CN101219277A (en) * | 2008-01-06 | 2008-07-16 | 王旭强 | Automatically card lifting mechanism of mah-jong machine |
| CN101569794A (en) * | 2008-11-21 | 2009-11-04 | 崔立成 | Double mah-jongg tile pushing and raising mechanism for eight-port automatic mah-jongg table |
| CN201591967U (en) * | 2009-12-29 | 2010-09-29 | 徐朗 | Double card-pushing and card-rising mechanism of eight-hole automatic mahjong table |
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| CN109663338A (en) | 2019-04-23 |
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