FR2493680A1 - MACHINE FOR THE MANUFACTURE OF ICE CREAM EQUIPPED WITH A DEVICE FOR AUTOMATIC CONTROL OF THE DEGREE OF CURING CREAM - Google Patents

Abstract

MACHINE FOR THE MANUFACTURING OF ICE CREAM EQUIPPED WITH A DEVICE FOR AUTOMATIC CONTROL OF THE DEGREE OF CURING OF THE CREAM. IN A CREAM MIXING CHAMBER 10 IN THE COURSE OF COOLING, THE SHAFT 11, 12 OF THE ROTATING AGITATOR IS EQUIPPED WITH A THERMOSTATIC PROBE 13 WHICH EXTENDS OBLIQUE FROM THE SHAFT 11 TO ROTATE WITHIN THE THE CREAM WHILE AN ELECTRIC LINE 14 PASSES INSIDE THE SHAFT 12 TO ACHIEVE CONTACTS 15, 16 CONNECTED TO THE CONTROL CIRCUIT 19 OF THE COOLING GROUP 20 OF THE MACHINE.

Description

The invention relates to a machine for the manufacture of sorbet,

  ice cream or ice cream, equipped with a means capable of automatically controlling the

  degree of setting or consistency of the cooled cream.

  It has been recognized that a machine is needed for the manufacture of what will be called later, for simplicity, only ice cream, capable of controlling the degree of setting or solidification and of automatically stopping the production of the product. cold

  when the desired consistency is reached.

  Since the degree of hardening of the ice cream depends strictly on its temperature, it has already been proposed to dispose inside the chamber containing

  the cream a thermostat responsible for interrupting the operation-

  refrigeration unit at the time of the

  a predetermined temperature.

  Such a control means has proved completely inadequate because it is able to provide only approximate indications of the actual intake of the cream. This occurs because the thermostat occupies a fixed position against a wall of the chamber containing the cream being cooled; it is therefore influenced by the outside temperature and it is only touched

by the cream in motion.

  It was also proposed to evaluate the resistant torque encountered by the motor shaft via

  agitator which rotates in the chamber against

  the cream during curing.

  Such a device is described, for example, in

Italian Patent No. 659,061.

  Its operation is quite satisfactory but

  it still depends a lot on the efficiency of mixing.

  The main object of the invention is to achieve a device that is simultaneously safe to operate

and economic construction.

  For this purpose, according to the invention, in a machine

  for making ice cream of the type comprising a device

  tif automatic control of the degree of hardening of the

249368Q

  cooled cream, it is characteristic that this device is constituted by a thermostatic probe extending radially

  or obliquely from the shaft of the agitator for

  with the latter in the chamber containing the cream being cooled; this probe is connected functionally

  the cooling unit of the machine.

  The construction and functional characteristics

  tion of the machine of the invention as well as its advantages will appear more clearly during the

  description that we will now only give as

  For example; refer to the attached single figure which is

  a sectional view of a device made according to the invention.

  A mixing chamber 10 of a cream machine

  ice contains an agitator having a shaft 11 which is solid

  a motor shaft 12 extending outside this chamber. According to the invention from the shaft 11 extends

  solidly a thermostatic probe 13 which during operation

  tion, is drowned in the cream. This probe 13 is influenced by the temperature of the cream during cooling and provides an electrical signal which, via a line 14, controls the cooling unit of the machine in the direction of stopping operation when a predetermined temperature is reached . Line 14 passes inside the probe and the motor shaft and drives a

  control circuit 19 of the refrigerating unit 20 through

  a pair of sliding contacts 15, 16 and a line 17. There is taken a control signal from an indicating apparatus 18 on which the temperature can be read.

cream.

  It is therefore obvious that since the thermo

  static travels a circular orbit along which it explores the middle or middle area of the chamber

  of mixing, it raises a temperature which is

  the average temperature of the cream. It could of course be provided on the shaft of the agitator several probes, at various locations, which would detect an average temperature transformed into a single control signal. The probe (s) could also be incorporated

to the pallets of the agitator.

  Practical tests have demonstrated the extreme functional quality of the device of the invention, the cost of which has only a minimal effect on that of the set of

the machine.

* 493680,

Claims (2)

  A machine for making ice cream of the type comprising a mixing chamber in which a   stirrer is mounted rotating and provided   automatic control device for the degree of consistency of the cooled cream, characterized in that this device is constituted by a thermostatic probe (13) extending radially from the shaft (11) of the stirrer to rotate with it in the mixing chamber (10), this probe (13) being operably connected to a circuit (19)   control of the refrigerating unit of the machine.   2 / Machine according to claim 1 characterized in that the probe (13) is connected to the control circuit (19) by means of a power line (14) which passes inside said probe (13) and the shaft (11, 12) of the agitator at the end of which is provided a torque (15, 16) sliding contacts.   Machine according to claim 2, characterized in that an output line (17) from the contacts (15, 16) to a control circuit (19) of the refrigerating unit,   is connected to an indicator device (18) of the temperature.