Agitating – Stirrer within stationary mixing chamber – Rotatable stirrer
Patent
1992-12-07
1994-05-17
Hornsby, Harvey C.
Agitating
Stirrer within stationary mixing chamber
Rotatable stirrer
366310, 366311, 366313, 366320, 62343, A23G 912, A23G 922
Patent
active
053121848
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE DESCRIPTION
The invention relates to a stirring device for machines for the manufacture of ice-cream, of the type with a whipping cylinder with a horizontal axis, provided with means for extraction of the ice-cream at one head. More specifically, it relates to such a stirring device which comprises a peripheral stirrer rotating about the axis of the whipping cylinder.
BACKGROUND OF THE INVENTION
In known devices, the peripheral rotating stirrer generally consists of a pair of stirring/scraping blades of helical shape which are fixed diametrically opposite one another on an operating shaft. The helical blades, in addition to stirring the mass of ice-cream in the whipping cylinder, have the function of scraping from the internal wall of the whipping cylinder the layer of mixture which comes to adhere to the wall. This layer of mixture in fact limits the thermal conduction between the mixture and the wall of the whipping chamber which is in a heat-exchange relationship with the associated refrigeration devices and, if not removed, has a particle size which is too large since it grows without undergoing the mechanical action of mixing. Known stirring devices have, however, considerable disadvantages. From the constructional point of view, for the purpose of guaranteeing both the scraping action and the rotation of the stirrer in a perfectly centered position in the cylinder, the arrangement of the helical blades on the stirrer is subject to the strictest tolerances, adherence to which often requires costly rectification treatments. The whole is made considerably more difficult by the great length of the stirrer itself, as a result of which the manufacture of the stirring device is complex and expensive. From the functional point of view, the helical scraping and stirring blades are subject to considerable wear which compromises their functionality, necessitating laborious and complex maintenance interventions. The rubbing of the stirrer against the whipping cylinder moreover causes the undesirable production of metal dust which contaminates the mixture.
SUMMARY OF THE INVENTION
The aim of the invention is therefore to produce a stirring device of the type described in the introduction, which makes it possible to overcome the disadvantages of known stirring devices, ensuring at the same time greater functional efficiency.
The invention achieves the above mentioned aims by means of a stirring device of the type referred to in the introduction. The peripheral rotating stirrer consists of two stirring blades of helical shape which are diametrically opposite one another and extend essentially over the entire length of the whipping cylinder at a slight distance from the internal wall of the same, the stirring blades being supported on a hub which is integral with the operating shaft. There is provided between the two stirring blades a plurality of scraping vanes which are capable of interacting, with their radially external side, with the internal wall of the whipping cylinder and which are arranged staggered angularly and longitudinally in relation to one another over the length of the whipping cylinder itself.
According to another characteristic of the invention, the scraping vanes are supported on the stirrer in a self-centering and self-adjusting manner. They are freely oscillating both ways in the radial direction of the stirrer and have such an inclination in relation to the radial direction and a scraping edge shaped in such a manner that the action of compression against the internal wall of the whipping cylinder is brought about by the mass of ice-cream or mixture accumulating on their radially internal side.
With reference to the direction of rotation of the stirrer, the scraping vanes are arranged in a set back position in relation to the stirring blades. The stirring blades thus reduce the thickness of the ice-cream deposited on the wall of the whipping cylinder to a fixed thickness of the order of approximately 3 mm. The scraping work of the vanes, which are made of plastic material,
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Carpigiani S.R.L.
Cooley Charles
Hornsby Harvey C.
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