TWI679050B - Flop device for Mahjong game machine - Google Patents

Abstract

This creation is a floppy device for a mahjong game machine. A flop machine is set above the recovery hole of the mahjong game machine. The flop machine has two symmetrical flop seats and a guide slot; A card holder pivot group is a rotating box driven by a brushless motor, and the rotating box is provided with an opening receiving slot, and at least four card slots are arranged in the receiving slot; the guide slot is provided in the two Between the flop seats, there is a groove part and a slanted wing part on each side thereof, and a communication opening is provided at the bottom of the groove part, and each slanted wing part is respectively fixed to the flop seat, and The communication port corresponds to the upper part of the recovery hole of the mahjong game machine. With the above structure, the card slot is provided for the mahjong card to be temporarily put on the cover, and then the rotary box is driven to turn the mahjong card at the same time to open the card, and At the same time, turn the rotating box to turn its opening to the guide slot, so that the mahjong cards are thrown out of the communication port and the recovery hole for recycling, so that in actual mahjong games, all the players will be surprised at the same time. With stimulating effect.

Description

Flop device for Mahjong game machine

The present invention relates to a flop device for a mahjong game machine, in particular, it has two symmetrical flop sockets, each of which has a pivot box capable of driving a turning box, and the rotary box has a card slot for placing Mahjong Card, flipping the spin box allows the Mahjong card to be opened simultaneously.

Press, as shown in Fig. 1, the conventional Mahjong game machine is controlled by a computer on a Mahjong game machine 10, which includes: a table 11 on which a robot arm 12 having a suction cup assembly 13 is arranged; Identification mechanism 14, a dice mechanism 15, a mahjong deck 16 and a recovery hole 17; taking the push mahjong game as an illustrative example, the mahjong deck 16 takes a whole set of mahjong from a barrel to a nine barrel, a whiteboard Four each for a total of forty Mahjong tiles 161. There are four tiles in a row stacked on top and bottom two layers, a total of eight cards in a row, a total of five columns of random Mahjong tiles 161; each game uses eight Mahjong tiles. Card 161, issued to each player two cards at a time, so each dealer (named the head of the banker) and three players (named the three players, respectively, Chu, Chu, and Wei) can play a five-roll pusher game ; When starting a new game of pushing the jackpot, first the dice points of the dice mechanism 15 are used to determine the order of the dealers. After the order is determined, the sucker assembly 13 of the robot arm 12 to the mahjong deck 16 is first Draw a Mahjong tile 161, then make the robot arm 12 move the Mahjong tile 1 61 to the identification mechanism 14 to perform photographic identification of the card type. After the identification is completed, it is regarded as the first Mahjong card 161 that has been issued to the first house. At the same time, the robot arm 12 displays the Mahjong card 161 card to all players. After a set time, Zhaogongxin was moved, and then the Mahjong card 161 was moved above the recovery hole 17 and put into the hole to complete one. The Mahjong card 161 licensing process allows the game to completely avoid personnel from contacting the Mahjong card 161 to ensure the fairness of the game and has an identification record to prevent fraud; then the first company issues a second Mahjong card 161, By analogy, eight Mahjong cards 161 are continuously issued, that is, eight Mahjong cards 161 are distributed to four players. After the cards are dealt, the three players must compare with the dealer's points in the hand; When playing cards, the mahjong game machine 10 displays the player's Mahjong card 161, and then puts it into the recovery hole 17. The Mahjong cards 161 are successively opened one by one, that is, the first card type is disclosed first according to the order of the cards. The second and third card types ..... In this way, during the licensing process, the Mahjong game machine 10 cannot be provided in the actual Mahjong game. Compared with the bookmaker, and failed to allow all players to review the types of cards held on the table 11 at the same time, the computer video game lost the sense of surprise and excitement, causing players to gradually lose interest in the game. Stores are losing revenue and falling It really needs to be improved.

The main purpose of the present invention is to solve the above problems, and to provide a flop device for a mahjong game machine. The main technology and purpose are: to set a flop machine above the recovery hole of the mahjong game machine, the flop machine has two phases Symmetrical flip decks, each of which has a rotating box driven by a brushless motor. The rotating box is set to hold Mahjong cards for playing games. Through the angle of the rotary box, the Mahjong cards are flipped. Can be folded or opened at the same time, in the actual mahjong game, to achieve the surprise and stimulating effect of the flop ratio at the same time; when recycling mahjong cards, you can flip the rotary box to throw the mahjong cards out. The guide slot that is in the center of the two flip decks and communicates with the recovery hole, so that the Mahjong card can be dropped into the recovery hole for convenient recovery.

According to the foregoing object of the present invention, a flop device for a mahjong game machine is provided. A flop machine is provided above a recovery hole of the mahjong game machine. A flop holder and a guide slot; wherein each of the flop holders is pivoted by a rotary box driven by a brushless motor, and the rotary box is provided with an accommodation slot having an opening, and the accommodation space is separated from each other. At least four card slots; the guide slot is provided between the two card slots, and has a groove portion and an oblique wing portion on each side of the groove portion; The inclined wing portions are respectively assembled on the flop base, so that the groove portion of the guide groove is located between two openings of the rotary box, and the communication port corresponds to the recovery hole of the mahjong game machine.

In one embodiment of the present invention, one side of the rotary case is a transparent plate, and the other side thereof is respectively provided with a notch corresponding to each of the card-receiving slots.

In an embodiment of the present invention, each of the flop holders includes: a base, which is arranged as an elongated bottom plate, and a vertical plate is arranged on the outer side of the long side of the bottom plate, and two ends of the vertical plate are respectively set A front side plate and a rear side plate are provided, and the bottom plate is provided with the brushless motor, the brushless motor has a rotating shaft, the rotating shaft passes through a transmission wheel; the front end of the rotary box is provided with a front convex shaft, and the front convex shaft pivot Grouped on the front side plate, a rear convex shaft is provided at the rear end thereof, the rear convex shaft passes through a driven wheel, the rear convex shaft is pivoted on the rear side plate, and a transmission belt is wound between the transmission wheel and the driven wheel, The brushless motor can drive the rotary box to rotate.

In an embodiment of the present invention, a license information lamp holder is respectively provided on the upper edges of the two front side plates and the two rear side plates, and the license information lamp holder is set as a fixed seat to be fixed on the front side plate and the rear. A side plate, the fixed base is further provided with a horizontal light guide plate, and the light guide plate is respectively recessed with a letter number lettering, and a light bar is arranged inside the fixed base to abut the light guide plate.

In an embodiment of the present invention, each of the rear side plates is provided with a horizontal elongated hole, a screw hole is respectively provided above and below the elongated hole, and an adjustment mechanism is provided in each of the elongated holes. The adjusting mechanism has an adjusting block having a convex rod at one end, and the adjusting block The entire block is provided with two horizontal long holes corresponding to the positions of the screw holes, the convex rod penetrates the long holes and is provided with a roller, and the two long screws are screwed to the screw holes through the horizontal long holes to make the adjustment. A block is displaceably screwed on the outer surface of the rear side plate, so that the roller abuts the inside of the transmission belt, so that the adjusting block can adjust the tightness of the transmission belt.

In an embodiment of the present invention, each of the rear side plates is provided with at least one mounting hole, and a sensor is disposed in the mounting hole. The rear end of each rotary box is made of metal material, so that the sensor Sensing the angular position of the rotary box.

In one embodiment of the present invention, a front lower baffle is provided between the front side plates of the second flop seat, so that it is blocked at the front end of the groove portion; a rear is provided between the rear side plates of the second flop seat. The lower baffle is blocked at the rear end of the groove portion.

In an embodiment of the present invention, the front lower baffle is provided with a front reflection sensor corresponding to the groove portion, and the rear lower baffle is provided with a rear reflection sensor corresponding to the front reflection sensor. .

With the above structure, the rotating box is first presented with the transparent board underneath, and the card slot is used for the temporary playing of the Mahjong cards in the game, and then each of the rotating boxes is driven by the brushless motor to turn over the transparent board. Above, the mahjong card is flipped and opened at the same time, and the rotary box is turned at the same time so that its opening is turned to the guide slot, so that the mahjong card is thrown out and dropped into the communication port and the recovery hole to recover the actual mahjong. In the game, let everyone flop at the same time with surprise and stimulating effect.

[Learning]

10‧‧‧ Mahjong game machine

11‧‧‧ countertop

12‧‧‧ robot arm

13‧‧‧ Suction cup assembly

14‧‧‧Identification Agency

15‧‧‧Roller

16‧‧‧ Mahjong deck

161‧‧‧ Mahjong

17‧‧‧ Recovery hole

〔this invention〕

20‧‧‧Flop Machine

21‧‧‧Guide

211‧‧‧Groove part

212‧‧‧ oblique wings

213‧‧‧lock hole

214‧‧‧Connect

215‧‧‧screw

22‧‧‧ Front lower bezel

221‧‧‧Screw

23‧‧‧ Rear lower bezel

231‧‧‧Screw

24‧‧‧ Front reflection sensor

25‧‧‧ Back Reflection Sensor

30‧‧‧ flop

31‧‧‧ base

32‧‧‧ floor

33‧‧‧Stand

331‧‧‧perforation

37‧‧‧Couplings

38‧‧‧drive wheel

39‧‧‧bearing

40‧‧‧Rotary Box

401‧‧‧Transparent board

402‧‧‧notch

403‧‧‧Front convex shaft

404‧‧‧backward shaft

41‧‧‧Receiving slot

42‧‧‧ opening

43‧‧‧ card slot

44‧‧‧Front bearing

45‧‧‧ Follower

46‧‧‧ rear bearing

47‧‧‧ Transmission Belt

48‧‧‧Sensor

49‧‧‧ adjustment agency

491‧‧‧Adjustment block

34‧‧‧ front side panel

341‧‧‧Front bearing groove

35‧‧‧ rear side panel

351‧‧‧ rear bearing groove

352‧‧‧bearing groove

353‧‧‧Mounting holes

354‧‧‧long hole

355‧‧‧screw holes

36‧‧‧Brushless motor

361‧‧‧Shaft

492‧‧‧ convex rod

493‧‧‧Horizontal slot

494‧‧‧roller

495‧‧‧screw

50‧‧‧ Licensing information lamp holder

51‧‧‧Fixed

52‧‧‧light guide

53‧‧‧Code lettering

54‧‧‧light bar

Figure 1 is a schematic diagram of the equipment architecture of a conventional Mahjong game machine.

FIG. 2 is a schematic diagram of the equipment architecture of the present invention.

FIG. 3 is a rear perspective exploded view of the present invention.

FIG. 4 is a rear perspective view of the present invention.

Fig. 5 is a side sectional view of placing a mahjong card according to the present invention.

Fig. 6 is a partial schematic cross-sectional view showing the opening of a mahjong card of the present invention.

FIG. 7 is a schematic cross-sectional view of the Mahjong card recovered in the present invention.

FIG. 8 is a schematic diagram of the action of turning the remaining Mahjong tiles in the groove portion of the present invention.

In order to make your reviewing members have a better understanding of this creation, here is a preferred embodiment with drawings, detailed as follows: Please refer to Figures 2 to 8, a Mahjong game flop device attached to the Mahjong A flop machine 20 is provided above the recovery hole 17 of the gaming machine 10, and the flop machine 20 has two symmetrical flop seats 30, a guide groove 21, a front lower baffle 22, and a rear lower baffle 23; Each of the flop seats 30 includes: a base 31, which is arranged as an elongated bottom plate 32. A long plate 33 is arranged on the outer side of the long side of the bottom plate 32, and the up plate 33 is provided with at least two perforations 331. A front side plate 34 and a rear side plate 35 are respectively set at both ends of the side, and the edges of the front side plate 34 and the rear side plate 35 are respectively combined with the edge of the upright plate 33. A brushless motor 36 having a rotating shaft 361 is provided on the bottom plate 32 The rotating shaft 361 sequentially passes through a coupling 37, a transmission wheel 38, and a bearing 39; the inner surface of the front side plate 34 is provided with a front bearing groove 341; and the inner surface of the rear side plate 35 is provided with a rear bearing groove 351 and a A bearing slot 352, and the rear side plate 35 is provided with at least one mounting hole 353 and a horizontal elongated hole 354, and the periphery of the elongated hole 354 is A screw hole 355 is respectively provided below; and the bearing groove 352 is used for fixing the bearing 39 in an embedded group; and a rotary box 40 is provided with an accommodation groove 41 having an opening 42, and at least four are arranged in the accommodation groove 41. A card slot 43, one side of the rotary box 40 is a transparent plate 401, and the other side of the rotary box 40 corresponds to each of the card slot 43 A notch 402 is provided at each place; a front convex shaft 403 is provided at the front end of the rotary box 40, and a rear convex shaft 404 is provided at the rear end thereof. The front convex shaft 403 passes through a front bearing 44 and the front bearing 44 is embedded and fixed. In the front bearing groove 341, the rear convex shaft 404 sequentially passes through a driven wheel 45 and a rear bearing 46, and the rear bearing 46 is embedded and fixed in the rear bearing groove 351. The transmission wheel 38 and the driven wheel 45 A transmission belt 47 is wound therebetween, so that the brushless motor 36 can drive the rotary box 40 to rotate with the front bearing 44 and the rear bearing 46 as the axis; and the upper edges of the front side plate 34 and the rear side plate 35 are respectively provided with a license. Information lamp holder 50, the licensing information lamp holder 50 is provided as a fixed seat 51 group fixed to the front side plate 34 and the rear side plate 35, and the fixed seat 51 is further provided with a lateral light guide plate 52, and the light guide plates 52 are respectively A generation number lettering 53 is recessed, and a light bar 54 is provided inside the fixed seat 51 to abut the light guide plate 52. The light bar 54 sends light into the light guide plate 52 by way of rear-end illumination, and transmits light light to the light guide plate. At the far end of 52, light will pass through the front of the light guide plate 52, and the code lettering 53 will reflect the light and shine; in the mounting hole 353, A sensor 48 is provided, and the rear end of the rotary box 40 is made of metal material, so that the sensor 48 can sense the angular position of the rotary box 40; and an adjustment mechanism is provided in the long hole 354 of the rear side plate 35 49. The adjusting mechanism 49 has an adjusting block 491. One end of the adjusting block 491 has a convex rod 492, and two horizontal long holes 493 corresponding to the positions of the screw holes 355 are provided. The convex rod 492 penetrates the long holes. A roller 494 is set in 354, and two screws 495 are screwed to the screw hole 355 through the transverse long hole 493, so that the adjusting block 491 can be displaceably screwed on the outer surface of the rear side plate 35, so that the roller 494 Abutting against the inner side of the transmission belt 47, the adjusting block 491 can adjust the tightness of the transmission belt 47; the guide groove 21 is provided between the two flop seats 30, and has a groove portion 211 integrally and two sides thereof are provided respectively. There is a slanted wing portion 212, at least two locking holes 213 are provided at the top edge of each slanted wing portion 212, and a communication opening 214 is provided at the bottom of the groove portion 211, and each slanted wing portion 212 passes through the screw 215 through the The perforation 331 screw of the vertical plate 33 is assembled in the locking hole 213, so that the groove portion 211 of the guide groove 21 is located at the rotation. Two openings of box 40 42 And the communication port 214 corresponds to the recovery hole 17 of the mahjong game machine 10; the front lower baffle plate 22 cooperates with at least two screws 221 across the front side plate 34 of the second flop seat 30 to block it from the The front end of the recessed part 211 is provided with a reflection sensor 24 corresponding to the front part of the recessed part 211; the rear lower baffle 23 cooperates with at least two screws 231 across the rear side plate 35 of the second flip base 30 to make it Blocked at the rear end of the groove portion 211, and provided with a reflection sensor 25 corresponding to the front reflection sensor 24 and the rear reflection sensor 25; with the above structure, the rotary box 40 first presents the transparent plate 401 under the The card slot 43 is used for the temporary playing of the Mahjong card 161, and then the brushless motor 36 is used to drive each of the rotary boxes 40 to turn the transparent board 401 on, so that the Mahjong card 161 is turned over and opened at the same time. , And then turn the rotating box 40 at the same time so that its opening 42 is turned to the guide groove 21, so that the mahjong card 161 is thrown out and dropped into the communication port 214 and the recovery hole 17, so that in the actual mahjong game, let each family At the same time, the flop ratio is surprising and exciting.

The composition and function of the present invention are described in detail as follows: Please refer to FIGS. 2 to 8. The flop machine 20 of the present invention is fixed above the recovery hole 17 of the mahjong game machine 10 (as shown in FIG. 2) and is controlled by a computer. Control the mahjong game on the mahjong game machine 10. Take the banker (namely the banker with the code name as head) and the three players (namely the three players with the code names Ide, Chuan, and Oji) as examples. When starting a new game, first make the two openings 42 of the rotating box 40 correspond, so that the transparent plate 401 is positioned below, and the sensor 48 can sense whether the rotating box 40 is at the correct angle. If the angle is correct, then Continuing the game, the dice order is determined by the dice roll 15 of the dice agency 15. If the sum of dice points is 7, the first order is Sichuan, the second order is tail, and the third order is third. The home is the head and the fourth is the home. After the order is determined, the sucker assembly 13 of the robot arm 12 to the mahjong deck 16 first draws a mahjong card 161, and then the robot arm 12 moves the mahjong card 161 to The identification mechanism 14 performs photographic identification of the card type. It has been sent home for the first The first Mahjong card 161, at this time, the card type of the Mahjong card 161 is not displayed to each house, and the suction cup assembly 13 of the robot arm 12 is placed in the card slot 43 (such as (Shown in Figure 5), the code lettering 53 of the light guide plate 52 is set to "head", "out", "chuan", and "tail" respectively, so the mahjong card 161 must be placed next to the code Lettering 53 is the first card slot 43 of "Chuan". When the suction cup assembly 13 of the robot arm 12 sucks the Mahjong card 161 to be placed in the card slot 43, the notch 402 of the rotary box 40 provides the suction cup assembly 13 allows the Mahjong card 161 to enter the card slot 43 completely and completely, and after the robot arm 12 is placed, the width of the notch 402 is larger than the width of the suction cup assembly 13 so that the suction cup assembly 13 can leave smoothly. Proceed to the next card opening procedure; and so on, the second Mahjong card 161 is placed in the second card slot 43 adjacent to the code lettering 53 as "Chuan", and the third and fourth Mahjong cards 161 are placed in the phase. Adjacent to the code lettering 53 is the "tail" card slot 43, and the fifth and sixth mahjong cards 161 are placed in the neighbouring code lettering 53 to the "head" card. The card slot 43, the seventh and eight Mahjong cards 161 are placed in the card slot 43 next to the code lettering 53 as "out", that is to say, the eight Mahjong cards 161 of a game are dealt and halted; Although the Mahjong cards 161 are identified by the identification mechanism 14, each player does not know what type of cards they hold. Next, a simultaneous card opening process is performed, and the brushless motor 36 is passed through the association. The shaft 37 drives the transmission wheel 38, and the transmission wheel 38 rotates the driven wheel 45 through the transmission belt 47. In this way, the rotary box 40 rotates synchronously with the driven wheel 45, and the rotary box 40 is turned into a transparent plate 401 is on the top (as shown in Figure 6), and the opening 42 is facing outward, so that the 161 cards of the Mahjong cards are facing upwards. The turning angle of the cards is preferably 180 degrees. The device 48 detects the position of the rotary box 40, which can provide players with the fun of playing the package mahjong game at the same time to open the card than the card size, thereby increasing the sense of surprise and excitement. After the card is opened, the Mahjong game machine 10 is controlled by the computer to calculate the results of each card type and end the game. Then, the Mahjong card 161 located in the card slot 43 is recovered once. The brush motor 36 drives the rotary box 40 in the reverse direction. When the reverse angle is greater than the original flip angle, that is, the reverse angle is greater than 180 degrees, for example, the reverse angle is 200 degrees, the opening 42 of the rotary box 40 will tend to the guide groove. 21 (as shown in FIG. 7), and pour the eight Mahjong tiles 161 into the groove portion 211, and cover them with the front and rear lower baffles 22 and 23 to prevent the Mahjong tiles 161 from being dumped. Bounced out of the groove portion 211; and when tilted, the reversing angle of the rotary box 40 is between 180 degrees and 200 degrees, and the driving of the brushless motor 36 is accelerated in the reverse direction, so that the mahjong card 161 can be set by the card The effect that the slot 43 can be thrown away can make the Mahjong card 161 fall into the communication port 214 and the recovery hole 17 for recovery; if a part of the Mahjong card 161 is left in the groove portion 211 and does not fall into the recovery hole 17, the The front and rear reflection sensors 24 and 25 sense this condition, and the mahjong game machine 10 can cause the robot arm 12 to push the mahjong cards 161 toward the groove with the sucker assembly 13 in the groove portion 211. The communication port 214 is made to fall into the recovery hole 17 (as shown in FIG. 8), thereby removing the remaining Mahjong tiles 161 on the guide groove 21. Furthermore, to prevent the floppy machine 20 from playing for a long time, its transmission belt 47 will relax after friction, which will affect the turning angle of the rotary box 40. The screw 495 of the adjusting block 491 can be loosened by screwing, and then along the length. Push the adjustment block 491 laterally in the direction of the strip hole 354, so that the roller 494 is pressed against the inside of the transmission belt 47 in the outward direction, thereby increasing the pressure to tighten the transmission belt 47, and then screwing the screw 495 to fix the adjustment block 491. The effect of adjusting the proper tightness of the transmission belt 47 is completed.

The above-mentioned embodiments are merely preferred embodiments for fully explaining the present invention, and are not intended to limit the features of the present invention. For example, any re-creation using the related technical means and creation principles of the present invention still belongs to the present invention. Equivalent creative category.

Claims (8)

A flop device for a mahjong game machine is provided with a flop machine above the recovery hole of the mahjong game machine. The flop machine has two symmetrical flop seats and a guide slot; each of the flop seats is respectively The pivot group is a rotating box driven by a brushless motor, and the rotating box is provided with an opening receiving slot, and at least four card slots are arranged in the receiving slot; the guide slot is provided on the two flip cards. Between the seats, there is a groove portion and an inclined wing portion is provided on both sides thereof, and a communication opening is provided at the bottom of the groove portion, and each of the inclined wing portions is respectively fixed to the flop seat, so that the guide The groove portion of the groove is located between the two openings of the rotary box, and the communication port corresponds to the recovery hole of the mahjong game machine. For example, the flip device of the mahjong game machine of claim 1, wherein one side of the rotary box is a transparent plate, and the other side is provided with a notch corresponding to each of the card slot. For example, the flop device of the Mahjong game machine of claim 1, wherein each of the flop sockets includes: a base, which is set into an elongated base plate, and a vertical plate is arranged on the outer side of the long side of the base plate, and the vertical plate A front side plate and a rear side plate are respectively arranged at both ends, and the bottom plate is provided with the brushless motor, the brushless motor has a rotating shaft, the rotating shaft passes through a transmission wheel; the front end of the rotary box is provided with a forward convex shaft, the A front convex shaft is pivoted on the front side plate, and a rear convex shaft is provided at the rear end thereof. The rear convex shaft passes through a driven wheel. The rear convex shaft is pivoted on the rear plate. The transmission wheel and the driven wheel are wound around. A transmission belt is provided so that the brushless motor can drive the rotary box to rotate. For example, the flip device of the Mahjong game machine of item 3, wherein the upper edges of the two front side plates and the two rear side plates are respectively provided with a license information lamp holder, and the license information lamp holder is set as a fixed seat and fixed on the license holder. The front side plate and the rear side plate, the fixing base is further provided with a horizontal light guide plate, and the light guide plate is respectively recessed with a letter number lettering, and a light bar is arranged inside the fixing base to abut the light guide plate. For example, the flop device of the Mahjong game machine of claim 3, wherein each of the rear side plates is provided with a horizontal long hole, a screw hole is provided above and below the long hole, and a long hole is provided in each of the long holes. An adjusting mechanism having an adjusting block having a convex rod at one end thereof, and the adjusting block is provided with two horizontally long holes corresponding to the positions of the screw holes respectively, and the convex rod penetrates the long holes and sets There is a roller, and the two long screws are screwed into the screw holes through the horizontally long holes, so that the adjusting block is displaceably screwed on the outer surface of the rear side plate, so that the roller abuts the inside of the transmission belt, so that the adjusting block The tightness of the transmission belt can be adjusted. For example, the flip device of the Mahjong game machine of claim 3, wherein each of the rear side plates is provided with at least one mounting hole, and a sensor is installed in the mounting hole, and the rear end of each rotary box is made of metal material, so that The sensor can sense the angular position of the rotating box. For example, the flop device of the Mahjong game machine of item 3, wherein a front lower baffle is provided between the front side plates of the second flop seat, so that it is blocked at the front end of the groove portion; A rear lower baffle is arranged in between to block the rear end of the groove portion. For example, the flip device of the Mahjong game machine of item 7, wherein the front lower bezel is provided with a front reflection sensor corresponding to the groove portion, and the rear lower bezel is provided with a rear reflection sensor corresponding to the front reflection sensor. Reflection sensor.