Patent GB-874228-A (GB)
Title: Improvements relating to chocolate and like enrobing machines
IPC: A23G9/24
Filed: 1956-10-31
Abstract: 874,228. Enrobing machines. MEAGHER, W. D., and MEAGHER, G. Dec 17, 1957 [Oct. 31, 1956], No. 33180/56. Addition to 736,810. Class 28 (1). In the enrobing machine of the parent Specification the pre-set temperature controller associated with the chocolate delivery system is supplemented by at least one similar controller directly responsive to the temperature of the heating water in the container jacket, the admission of cold water to check, the over-run of heat from water to chocolate being controlled by at least one valve which is electrically actuated upon automatic interruption of the heating current by one of said controllers. The " seeding " and " main " compartments 1, 2 of chocolate container 3 are connected by a small orifice 4 and have, surrounding their lower parts, separate hot-water jackets 5, 6 to which mains water is supplied through pipes 8 controlled by electromagnetic valves 9. A single immersion heater 18 is provided in jacket 5 and a pair of parallely-connected heaters 19 are provided in jacket 6. Pump 20 delivers molten chocolate from compartment 2 of container 3 through a pipe 23 to a fish-tail nozzle or the like 21 above conveyer 22, hot water being pumped from jacket 6 through jackets 25, 26 surrounding pump 20 and delivery pipe 23. In the nozzle 21 and water-jackets 5, 6, respectively, are the bulbs 27, 28, 29 of three dial thermometers 30, 32, 31 associated with temperature controllers 33, 35, 34 connected in parallel to an electricity supply through a switch 36. A contact 37 on the needle  38 of the dial thermometer 32 co-operates with an insulated contact 39 on a concentric pointer 40 adjustable over the dial by means of a knob and is electrically connected to the positive line 41. Shunted across the heater and the contacts of switch 42 in series therewith are a taut wire 43 normally holding the contacts open but expanding, when heated, to allow them to close under spring action and energize heater 18. This heats jacket 5 until its temperature reaches that at which pointer 40 has been set when wire 43 is shorted out and switch 42 opens and breaks the circuit to heater 18. When enrobing is to take place, conveyer 22, an agitator in container 3 and pumps 20, 24 are started, the main water supply is turned on to valves 9 and switch 36 is closed. Initially only heater 18 is energized until switch 46 is closed to bring in heaters 19. When the jacket 5 of compartment 1 has reached approximately 85‹ F., controller 35 switches off heater 18 and energizes relay 48, shunted across the latter, to open the appropriate valve 9 to admit cold water to jacket 5 and check any further conduction of heat from the jacket to the chocolate in compartment 1. Similarly controller 33 operates at approximately 89‹ F. to shut off heaters 19, energize a relay 49 and hence open the other valve 9 to admit cold water to the jacket 6. A switch 50 may be provided to cut out one of the heaters 19 unless the room temperature is low, once the desired temperature has been attained in compartment 2. When enrobing is not taking place but the machine is being held in readiness, switch 46 engages a second contact 51 and jacket 6 is maintained at approximately 90‹ F. Chocolate in container 3 is tempered by suitably adjusting the setting of controllers 34, 35.