Card shuffling apparatus with automatic card size calibration during shuffling

• US 8,038,521 B2
• Filed: 05/30/2006
• Issued: 10/18/2011
• Est. Priority Date: 09/28/2001
• Status: Active Grant

• Current Assignee: LNW Gaming Incorporated
• Original Assignee: SHFL Entertainment Incorporated (Scientific Games Corporation)
• Inventors: Bourbour, Feraidoon, Grauzer, Attila, Stasson, James B.
• Primary Examiner(s): Elisca; Pierre E
• Application Number:
  US11/444,285
• Publication Number:
  US 20060281534A1
• Time in Patent Office: 1,967 Days
• Field of Search: 463/17, 463/12, 463/13
• US Class Current: 463/17
• CPC Class Codes: A63F 1/12 Card shufflers

Abstract

A device for automatically calibrating for card size during card handling is disclosed. The device includes a card receiving area, a card stacking area and a card moving system for moving cards from the card receiving area to the card stacking area. An elevator located in the card stacking area has a movable platform for moving a stack of cards, and has a collection surface on the platform. A motor moves the platform within the elevator. At least one sensor senses at least one of a) position of the platform, b) height of the platform, c) position of a card in the elevator, d) height of a card or cards in the elevator, e) pressure applied to a card in the elevator, e) presence of the platform at a predetermined height, f) presence of the platform at a predetermined position, g) presence of card(s) on the platform, and h) absence of card(s) on the platform. A method for calibrating a card handling device during shuffling is also disclosed. The method is practiced by providing a device having a card receiving area and a card stacking area comprising an elevator with a card support platform and grippers. The method includes feeding at least two initial cards into a card stacking area, automatically identifying a target elevator height that corresponds to a height at which at least a single card on the card support platform is gripped and one card remains on the platform, and randomly feeding remaining cards into the card stacking area.

Claims

1. A device for card handling comprising:

a card receiving area for receiving an initial set of cards;

a card stacking area for receiving cards from the card receiving area;

a card moving system for moving cards from the card receiving area to the card stacking area;

an elevator in the card stacking area with a moving platform for moving a stack of cards;

a collection surface on the moving platform in the elevator;

a processor associated with the device, the processor being programmed with software;

a motor to move the moving platform in the card stacking area;

at least one sensor for sensing at least one of a) position of the platform, b) height of the platform, c) position of any card in the elevator in the card stacking area, d) height of any card or cards in the elevator in the card stacking area, e) pressure applied to any card in the elevator in the card stacking area, f) presence of the platform at a predetermined height, g) presence of the platform at a predetermined position, h) presence of card(s) on the platform, and i) absence of card(s) on the platform, and the software programmed in the processor being accessible to direct the device to automatically calibrate the device to enable the device to accurately handle cards during card shuffling.

2. The device of claim 1 and further comprising a suspending element for suspending at least one card in the card stacking area, wherein the suspending element is a pair of grippers, and wherein the grippers are present in the card stacking area to support cards.

3. The device of claim 2 wherein the grippers can separate a first two inserted cards.

4. The device of claim 3 wherein the software directs the device to perform at least the following steps;

a) moving the platform from a base position below a card insertion point to a position above the card insertion point, and registering both positions of the platform in the microprocessor, b) moving a predetermined number of cards from the card receiving area into the stacking area; and

c) moving at least one gripper to attempt contact of the grippers with at least one card in the stacking area.

5. The device of claim 4 wherein the program directs the device to move at least one gripper a first distance into contact with cards in the stacking area while those cards are on the platform at a first gripping position, at least some subsequent moves of the at least one gripper being of a different distance as compared to a preceding movement, movement of the at least one gripper continuing at least until a predetermined degree of contact is effected between the at least one gripper and card(s) in the card collection chamber.

6. The device of claim 5 wherein the program directs two opposed grippers into contact with cards in the stacking area and movement of the two grippers continues until a predetermined degree of contact between the two opposed grippers and card(s) in the stopping chamber is affected.

7. The device of claim 5 wherein after a predetermined degree of contact is attained, another series of steps is performed in which card(s) on the platform are lowered below the first gripping position and then elevated into a second gripping position where the platform is lower than it was at the first gripping position, a sensor identifying whether at least one card is gripped at the second gripping position.

8. The device of claim 1 wherein card injectors are able to insert individual cards into the stacking chamber.

9. The device of claim 1 wherein there is an insert that can separate a stack of cards in the stacking chamber into two segments.

10. A device for forming a random set of playing cards comprising:

a top surface and a bottom surface of said device;

a card receiving area for receiving an initial set of playing cards;

a processor communicatively associated with the device;

a randomizing system for randomizing the initial set of playing cards;

a collection surface in a card collection area for receiving randomized playing cards, the collection surface receiving cards so that all cards are received below the top surface of the device;

an elevator for raising the collection surface so that at least some randomized cards are elevated at least to the top surface of the device;

at least one sensor for sensing at least one of a) position of the platform, b) height of the platform, c) position of any card on the card collection surface in the elevator in the card collection area, d) height of any card or cards in the elevator in the card collection area, e) pressure applied to any card on the card collection surface in the elevator in the card collection area, f) presence of the platform at a predetermined height, g) of the platform at a predetermined position, h) presence of card(s) on the platform, and i) absence of card(s) on the platform, and the processor having software that can be accessed to direct the device to automatically calibrate the device during shuffling to enable the device to accurately handle cards.

11. The device of claim 10 wherein the elevator raises all randomized cards above the top surface of the device.

12. The device of claim 10 wherein a confining set of walls confines all randomized cards along at least two edges of the playing cards after the randomized cards are elevated.

13. The device of claim 10 wherein at least one pick-off roller removes cards one at a time from the card receiving area and moves cards one at a time towards the randomizing system.

14. The device of claim 10 wherein the processor controls movement of the pick-off roller and at least one pair of rollers that assist in moving cards between the card receiving area and the collection area.

15. A device for forming a random set of playing cards comprising:

a top surface and a bottom surface of said device;

a processor communicatively associated with the device;

a receiving area for an initial set of playing cards;

a randomizing system for the initial set of playing cards;

a collection surface in a card collection area for receiving playing cards that are being randomized;

an elevator in the card collection area for raising the collection surface within the card collection area;

at least one card supporting element within the card collection area that will support a predetermined number of cards within the card collection area;

an insertion point to the card collection area positioned below said at least one card supporting element;

at least one sensor for sensing at least one of a) position of the platform, b) height of the platform, c) position of any card on a support surface in the elevator in the card collection area, d) height of any card or cards in the elevator in the card collection area, e) pressure applied to any card on a card collection surface in the elevator in the card collection area, f) presence of the platform at a predetermined height, g) presence of the platform at a predetermined position, h) presence of card(s) on the platform, and i) absence of card(s) on the platform, and the processor having software that can be accessed to direct the device to automatically calibrate the device to enable the device to accurately handle cards during shuffling.

16. A method for calibrating a card handling device during shuffling utilizing a device having a) a processor, b) a card receiving area and c) a card stacking area comprising an elevator with a card support platform and grippers, the method comprising:

feeding at least two initial cards from the card receiving area into the card stacking area;

the processor automatically identifying a random target elevator height that corresponds to a height at which at least one card on the card support platform is gripped, and at least one card remains on the platform; and

randomly feeding cards into the card stacking area.

17. The method of claim 16, wherein two initial cards are fed into the card stacking area.

18. The method of claim 17, and further comprising testing the target elevator height multiple times prior to feeding a third initial card.

19. The method of claim 16, wherein the step of automatically identifying a target elevator height comprises elevating the elevator, gripping, lowering the elevator and sensing at least one of a gripped card and a card present on the elevator.

20. The method of claim 19, and further comprising adjusting an elevator height when a single gripped card and a single present card are not sensed.

21. The method of claim 16, wherein a total of between 5 and 15 initial cards are fed and the target elevator height is tested after each of the initial cards are fed.

22. The method of claim 21, and further comprising randomly feeding additional cards after the initial cards are fed.

23. The method of claim 21, wherein the initial cards are randomly fed.

24. The method of claim 21, wherein the initial cards are sequentially fed.

25. The method of claim 16, wherein the target elevator height is tested periodically during a shuffle.

26. The method of claim 16, wherein the target elevator height is tested randomly during a shuffle.

27. The method of claim 16, and further comprising the step of testing a gripping width.

28. The method of claim 27, wherein a gripping width is adjusted.