Device for detecting and rejecting invalid coins utilizing a verticle coin chute and multiple coin tests

• US 4,483,431 A
• Filed: 10/13/1981
• Issued: 11/20/1984
• Est. Priority Date: 10/13/1981
• Status: Expired due to Fees

• Current Assignee: Harrah's Incorporated
• Original Assignee: Harrah's Incorporated
• Inventors: Pratt, Gary A.
• Primary Examiner(s): Bartuska, F. J.
• Application Number:
  US06/310,480
• Time in Patent Office: 1,134 Days
• Field of Search: 194/100 A, 194/1 K, 194/97 R, 194/97 A, 194/99, 194/101, 330/6, 307/309, 73/163, 324/235, 324/207, 338/32 H
• US Class Current: 194/317
• CPC Class Codes: G07D 5/02 Testing the dimensions, e.g. thickness, diameter; Testing the deformation
• CPC Class Codes: G07D 5/08 Testing the magnetic or electric properties

Abstract

A coin testing device having a substantially vertical coin chute with facility for testing coin size, central opening, topography and metal content while the coin is substantially traveling in free fall. Testing elements are located on the same side of the coin chute. The Hall effect is utilized to detect magnetic content.

Claims

1. In a coin acceptor having a coin chute including coin entry and discharge ends and coin deflector means at the discharge end operable between coin accept and reject positions, the combination comprising first detector means disposed along said chute for detecting passage of a coin having predetermined physical characteristics, including predetermined diameter and surface reflectivity, and producing a first coin accept signal in response thereto, first circuit means including timing means responsive to said first coin accept signal for producing a timing signal of predetermined duration, second detector means disposed along said chute for detecting the topography of the side of a coin and producing a coin topography representative signal, second circuit means responsive to said timing signal for measuring said representative signal for said predetermined duration and producing an output signal when said representative signal is of a predetermined characteristic, third circuit means responsive to said output signal for operating said coin deflector means, third detector means disposed along said chute for detecting presence of magnetic material in a coin moving along said chute, said third detector means being connected to control said third circuit means to cause said deflector means to be at said deflecting position upon detection of said magnetic material, said third detector means including a permanent magnet disposed on one side of said chute and cooperating means disposed on the opposite side of said chute adjacent said magnet for measuring the Hall Effect produced by a coin moving along said chute therebetween.

2. In a coin acceptor in accordance with claim 1 wherein said predetermined physical characteristics further include the absence of a washer hole in a coin moving along said chute.

3. In a coin acceptor in accordance with claim 1 wherein said first detector means includes first light emitting means and associated first light sensitive means disposed along said chute in position to direct light toward at least one of the opposed side edge regions of said chute to be reflected by the side edge region of a coin of predetermined minimum diameter moving along said chute and sensed by said first light sensitive means.

4. In a coin acceptor in accordance with claim 2 wherein said first detector means includes first light emitting means and associated first light sensitive means disposed along said chute in position to direct light toward at least one of the opposed side edge regions of said chute to be reflected by the side edge region of a coin of predetermined minimum diameter moving along said chute and sensed, by said first light sensitive means, and second light emitting means and associated second light sensitive means disposed along said chute in position to direct light toward a central portion of said chute at a point substantially equidistant therealong as said one of the opposed edge regions to be reflected by the central side region of said coin and sensed by said second light sensitive means.

5. In a coin acceptor in accordance with claim 2 wherein said second detector means includes separate light emitting and associated separate light sensitive means disposed along said chute downstream from said first light emitting and associated first light sensitive means in position to direct light toward the central portion of said chute to be reflected by the side surface of said coin and sensed by said separate light sensitive means.

6. In a coin acceptor in accordance with claim 5 wherein said second detector means further includes circuit means for converting the output of said separate light sensitive means to a pulse signal, the number and spacing of the pulses of which vary in accordance with the topography of said coin.

7. In a coin acceptor in accordance with claim 6 wherein said second circuit means includes counter means, said counting means being responsive to said timing signal to initiate counting of the pulses of said pulse signal and operable to produce said output signal upon reaching a predetermined count within the duration of said timing signal.

8. In a coin acceptor in accordance with claim 1 and further including lockout means for producing a lockout signal when there is no demand for coin acceptance, said lockout circuit being connected to control said third circuit means to cause said coin deflector means to be at the coin reject position in the absence of coin demand.

9. In a coin acceptor in accordance with claim 1 wherein said predetermined duration is the time required for a valid coin to free fall past said second detector means.

10. In a coin acceptor in accordance with claim 1 wherein said topography representative signal comprises a pulse signal.

11. In a coin acceptor in accordance with claim 1 wherein said coin deflector means includes a solenoid armature movable between a coin chute blocking location and coin chute unblocking location.

12. In a coin acceptor in accordance with claim 3 wherein said first light emitting means and associate first light sensitive means are disposed on the same side of the coin chute.