| 摘要 |
The invention relates to a means for indicating the presence of ingredients to be dispensed in a vending machine and provides in a typical example a light source such as light emitting diode 22 and a sensor such as a phototransistor 23 which together define a light path 25 across the neck portion 34 to a suitable ingredient container 31. The ingredient container is secured to a dispensing nozzle assembly comprising a sleeve 44 carrying a dispensing nozzle 41 and an inner valve block 50 incorporating a valve member 60, the arrangement being such on the ingredient level falling below the light path 25 the incident light falling upon sensor 23 is increased thereby providing an indication that the ingredients are "sold out". In a particular embodiment of the invention the light source is an infra red emitter which may be presented using a micro processor unit thereby inducing a level of the emitter.
|
