Pre-shuffler for a playing card shuffling machine

• US 7,584,963 B2
• Filed: 06/14/2006
• Issued: 09/08/2009
• Est. Priority Date: 08/19/2003
• Status: Active Grant

• Current Assignee: Sg Gaming, Inc. (Scientific Games Corporation)
• Original Assignee: Shuffle Master GMBH & Co KG (Scientific Games Corporation)
• Inventors: Krenn, Peter, Blaha, Ernst
• Primary Examiner(s): LAYNO, BENJAMIN
• Application Number:
  US11/452,691
• Publication Number:
  US 20060232005A1
• Time in Patent Office: 1,182 Days
• Field of Search: 273/149.R, 273/149.P
• US Class Current: 273/149.00R
• CPC Class Codes: A63F 1/12 Card shufflers

Abstract

The invention comprises a pre-shuffler that receives a quantity of cards to be shuffled, such as nine decks of cards. One embodiment of the pre-shuffler includes a horizontal moveable box having, for example, nine compartments with vertical walls for separating the cards to be shuffled into groups. Cards are placed into all or some of the compartments in the box, and a shuffling sequence is then commenced. A motor moves the box containing the cards so that the cards in the first compartment are deposited into an input tray of the main card shuffler. The main shuffler then forwards the cards in the input tray one by one, via rollers, to selected card receptacles in the main shuffler. The process is then continued for each group of cards in the pre-shuffler until all cards are in the main shuffler. The main shuffler then shuffles the cards in a normal fashion. The cards output from the main shuffler are in a more random order than had the cards not been pre-shuffled by the pre-shuffler.

Claims

1. A method for shuffling playing cards comprising:

providing a preshuffler;

providing a main shuffler;

providing a program stored in memory of a processor;

loading a plural groups of cards into the preshuffler;

according to the program, delivering one group of cards at a time that are to be shuffled out of the plural groups of cards that are to be shuffled to an input portion of the main shuffler;

according to the program and after the group of cards that are to be shuffled is delivered to the input portion of the main shuffler, forwarding cards in the input portion to a randomizing portion of the main shuffler; and

removing cards forwarded to the randomizing portion of the main shuffler in a substantially random order and placing randomized cards into an output portion of the main shuffler.

2. The method of claim 1 wherein the preshuffler comprises an input card holder segmented into compartments, and wherein delivering one group of cards at a time comprises moving the input card holder with respect to the input portion of the main shuffler for delivering one group of cards at a time to the input portion of the main shuffler.

3. The method of claim 2 wherein the input card holder is moved substantially horizontally by a motor drive to position a group of cards with respect to the input portion of the main shuffler.

4. The method of claim 3 wherein the pre-shuffler comprises a platform supporting the input card holder, the platform having an opening, and wherein delivering one group of cards at a time comprises moving the input cards relative to the platform to allow a group of cards to be moved over and aligned with the opening so as to fall through the opening and be delivered to the input portion of the main shuffler.

5. The method of claim 2 wherein the compartments comprise five or more compartments.

6. The method of claim 2 wherein each compartment holds at least 52 cards.

7. The method of claim 1 wherein the input portion of the main shuffler comprises an input tray of the main shuffler.

8. The method of claim 1 further comprising:

rotating rollers for forwarding one card at a time from a top of a group of cards in the input portion of the main shuffler to one of a plurality of card receptacles in the randomizing portion of the main shuffler, aligning card receptacles in a predetermined sequence with respect to the input portion of the main shuffler for receiving cards from the input portion; and

aligning card receptacles containing one or more cards in a predetermined sequence with respect to the output portion of the main shuffler, the output portion of the main shuffler receiving one or more cards from a card receptacle aligned with the output portion.

9. The method of claim 8 wherein aligning card receptacles containing one or more cards in a predetermined sequence with respect to the output portion of the main shuffler comprises aligning card receptacles containing one or more cards in a random sequence with respect to the output portion of the main shuffler.

10. The method of claim 1 wherein prior to delivery of a group of cards, automatically retracting a card weight to create an opening for the cards in the input portion.

11. The method of claim 1 wherein the processor is programmed to provide groups of cards sequentially to the input portion.

12. The method of claim 1 wherein the processor is programmed to provide groups of cards randomly to the input portion.

13. The method of claim 1 further comprising feeding delivered cards individually from the input portion of the shuffler to the randomizing portion in an order of playing cards reverse to an order of the group of cards when the group of cards is present in a compartment of the preshuffler.

14. A method of preshuffling playing cards prior to shuffling comprising:

providing a card shuffling device;

providing a preshuffler;

retaining multiple groups in a storage component of the preshuffler, the preshuffler providing separate ones of the multiple groups of playing cards to be shuffled upon separate insertion of ones of the groups of cards into an infeed tray of the card shuffling device;

providing the card shuffling device with an infeed tray;

selecting a group of retained cards in the storage component to deliver to the infeed tray;

automatically delivering the selected group as a set to the infeed tray of a card shuffling device, and

shuffling the cards delivered to the infeed tray of the card shuffling device;

wherein the selection and automatic delivery of cards is under the programmed control of a processor.

15. The method of claim 14 wherein the multiple groups of cards are retained in a rack structure.

16. The method of claim 15 wherein the rack includes between 2 and 9 compartments, each compartment for retaining a group of cards.

17. The method of claim 14 wherein the infeed tray comprises a lower card support surface, at least one feed roller and a sliding block structure to retain fed cards against the at least on feed roller.

18. The method of claim 17 wherein the lower support surface is a declining surface.

19. The method of claim 17 wherein the sliding block structure is automatically retracted prior to automatically delivering of the selected group.

20. The method of claim 14 wherein an order of cards in a delivered group of cards is reversed as the cards are fed into a card shuffling device.

21. The method of claim 14 wherein groups of cards are randomly selected for delivery of the group.

22. The method of claim 14 wherein the groups of cards are sequentially selected for delivery of the groups of cards.

23. The method of claim 14 wherein the groups of cards are selected according to a predetermined sequence.

24. The method of claim 14 wherein the retained groups of cards are aligned.

25. The method of claims 14 wherein the retained groups of cards are oriented such that a major surface of each card is substantially vertically disposed.

26. The method of claim 25 wherein a group of cards is delivered by dropping the group vertically into the feed tray.

27. The method of claim 14 wherein the retained groups of cards are approximately equal in numbers of cards.

28. The method of claim 14 wherein each group of cards is approximately the size of a deck of cards.

29. The method of claim 28 wherein the deck consists of between 52 and 54 cards.