【正文】 and a cock for taking out the prepared hot drink in said storage tank through an outlet pipe extending from the bottom of said storage tank. 2. The hot drink maker according to claim 1 wherein said means for controlling the water supply prises a level detector for detecting the level of the hot water when it reaches a predetermined level and a water supply valve incorporated in a water supply pipe for supplying water into said hot water tank, said valve being operatively connected to said level detector so that said valve is closed when said level detector detects the predetermined level. 3. The hot drink maker according to claim 2 wherein said hot water supply pipe is bent to form a bent top portion and said predetermined level of said hot water substantially accords with that of said bent top portion of said hot water supply pipe. 4. The hot drink maker according to claim 1 wherein said hot drink outlet pipe is thermally connected to said heater. 5. The hot drink maker according to claim 4 wherein said hot drink outlet pipe is connected to said heater through a heat conductive material. 6. The hot drink maker according to claim 1 which further prises a steam exhaust pipe having one end connected to the upper portion of said hot water tank and the other end opened in the atmosphere above said funnel. 7. The hot drink maker according to claim 1 wherein said heater disposed in said space is thermally controlled by a thermostat operatively connected to said heater. REFERENCES [1] Atmel Corporation, 2020. “8 bit microcontroller with 4k bytes insystem Programmable Flash AT89S51” [2] Ayala , 1996. “8051 microcontroller Architecture, Programming and Application” Second Edition Printed by Sunil Binding and printing Wrokes, Indie Printing Hous, Wadala, Mumbai 400031 [3] Thomas L. Flovd. 1996, “Electronics Devices” Fourth Edition , Prentice Hall, Inc. [4] Thomas E. Kisseell.. 1997 “Industrial Electronics” Prentice Hall, Inc. [5] Predko, M. 2020. “Programming and Customizing the 8051 Microcontroller. Reprinted in India by arrangement with the M. Graw Hill Companies Inc, New York [6] Philips Semiconductor Company. April 1999. “Data sheet of 80S51, 8 bit, Microcontroller Family”. April 1999 [7] Kleitz. W. 1998 “Microprocessor and Microcontroller Fundamentals” . 1998 [8] [9] [10] 。 a heat insulating box arranged so as to surround said storage tank with space there between。 a hot water supply pipe interconnecting said hot water tank and said spray head for supplying the hot water from said hot water tank to said funnel。 a funnel filled with material for preparing hot drink and detachably fitted to said casing in said opening。 a hot water tank located in said casing and filled with hot water heated to a predetermined temperature。 參考文獻 [1] Atmel Corporation, 2020. “8 bit microcontroller with 4k bytes insystem Programmable Flash AT89S51” [2] Ayala , 1996. “8051 microcontroller Architecture, Programming and Application” Second Edition Printed by Sunil Binding and printing Wrokes, Indie Printing Hous, Wadala, Mumbai 400031 [3] Thomas L. Flovd. 1996, “Electronics Devices” Fourth Edition , Prentice Hall, Inc. [4] Thomas E. Kisseell.. 1997 “Industrial Electronics” Prentice Hall, Inc. [5] Predko, M. 2020. “Programming and Customizing the 8051 Microcontroller. Reprinted in India by arrangement with the M. Graw Hill Companies Inc, New York [6] Philips Semiconductor Company. April 1999. “Data sheet of 80S51, 8 bit, Microcontroller Family”. April 1999 [7] Kleitz. W. 1998 “Microprocessor and Microcontroller Fundamentals” . 1998 [8] [9] [10] 附件 2：外文原文（復印件） HOT DRINK MAKERS abstract A hot drink maker prises an outer casing, a hot water tank located in the casing at a relatively high position and filled with hot water heated to a predetermined temperature, a device for controlling water supply in the hot water tank, a funnel filled with a material for preparing hot drink, and a storage tank disposed below the funnel for storing the prepared hot drink. The storage tank is suspended in a heat insulating box with air space there between and the air in the space is uniformly heated by an electric heater at a temperature suitable for drinking. A hot water supply pipe interconnects the hot water tank and the funnel through a spray head located above the funnel. BACKGROUND OF THE INVENTION This invention relates to an automatic hot drink maker installed on a floor or counter in a store such as a food service shop and a restaurant, and more particularly, to an automatic coffee urn in which a brewed coffee storage tank is located independently of a hot water tank and is heatconditioned to maintain a predetermined temperature suitable for drinking coffee. Various types of hot drink makers have been proposed and one of them is of the type in which hot drink such as coffee or soup is prepared by pouring hot water onto powdered or ground material in a funnel member and stored in a hot drink storage tank to obtain prepared hot drink at any desired time. An automatic coffee ur