Patent ID: 7547018

Claim:
A drawing machine comprising: a base; a transparent barrel mounted in the base to contain multiple numbered balls and having a top, a bottom, an access window and two ball inlets; a cover attached to the barrel to close the access window; a ball-activating device mounted in the base and connected to the bottom of the barrel to activate the balls to randomly jump in the barrel; a ball selector extending into the barrel to gather individually the numbered balls; two curved tubes mounted in the base and each having a top connected to the ball selector and a bottom corresponding to one of the ball inlets in the barrel; a ball collector mounted in the base; and two connector assemblies connected respectively to the bottoms of the curved tubes and each comprising a motor securely attached to the base and having a rotating shaft; and a connector attached to the rotating shaft and having a passage defined through the connector and selectively communicating with the bottom of a corresponding one of the curved tubes and one of the ball inlets in the barrel to allow the balls entering the barrel through the passage; and a guiding channel defined in the connector and selectively corresponding to the ball collector to lead the balls to enter the ball collector through the guiding channel, wherein each connector is composed of: two side plates; a connecting tube mounted between the side plates and having a central hole to serve as the passage in the connector; and a guiding plate mounted between the side plates and being curved to define the guiding channel between the side plates, wherein each side plate has a bore communicating with the central hole in the connecting tube; wherein the side plate that faces the corresponding curved tube has a through hole corresponding to and communicating with the guiding channel formed by the guiding plate, wherein each connector has a capability of blocking the balls when the connector is rotated to a position where the bottom of the corresponding curved tube connector is rotated to a position where the bottom of the corresponding curved tube aligns with a portion of the connector beside the passage and the guiding channel.