PL170706B1 - Sifter - Google Patents

Abstract

Loose materials sifter, especially flour provided with a sieve in the form a rotating body connected to the drive unit by means of a gear transmission, characterized by that the dividing line of the wheels the gears (7) have a shape different from a circle, preferably an ellipse shape

Description

The subject of the invention is a screen for screening loose materials, especially flour.

Known screens used in bakeries for refining flour have a screen in the form of a rotating block inside which a paw-shaped pusher is placed. Depending on the construction, the rotary movement is performed by a sieve or a pusher. This element is connected to the drive unit via a gear transmission. Due to the relative movement of the screen and the pusher, the flour is pressed outwards through the holes of the screen. After this operation, the flour should be clean. In practice, however, with this screen structure, impurities are also forced through the screen.

Also known is a screener without a pusher which overcomes the above drawbacks. In this screen, the screen is driven by the Maltese cross. The screen in such a solution is an efficient screen, but with large dimensions, which limits its use, especially in small bakeries. Also, the disadvantage is loud and even noisy work.

According to the invention, the dividing line of the gear driving the screen has a shape other than a circle, preferably an ellipse shape.

The use of a gear with elliptical wheels for the drive of the screen causes that the rotational speed of the screen changes cyclically, and thus increases the effectiveness of the screen.

The invention is shown in an exemplary embodiment in the drawing, in which Fig. 1 is a schematic view of the screen in vertical section, and Fig. 2 is a top view of an elliptical gear train.

The screen consists of a casing 1 with a funnel 2. Inside the casing 1, under the funnel 2 there is a rotating screen 3 with openings 4 in the side surface, and a cone 5 at the bottom. The screen 3 is connected via an elliptical gear 7 with the drive unit 9. The screen 3 is connected to fixedly with the axis 6 on which one of the gears of the transmission 7 is mounted, and the axis 8 of the second gear of this transmission 7 is connected to the drive unit 9. On the axis 6 a scraper 10 is permanently mounted.

The flour to be cleaned is poured through the funnel 2 into the sieve 3. The rotating sieve 3 presses the flour through the openings 4 into the housing 1. The impurities remain inside the sieve. The cone 5 directs the flour towards the side of the screen 3. The cleaned flour is moved by the scraper 10 towards the opening 11 in the housing 1, through which it is carried outside in a known manner, for example by a screw conveyor.

170 706

Fig 1

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Publishing Department of the Polish Patent Office. Circulation of 90 copies. Price PLN 2.00

Claims (1)

Patent claim A screen for loose materials, especially flour, provided with a screen in the form of a rotating body connected to the drive unit by means of a gear transmission, characterized in that the dividing line of the gears of the transmission (7) has a shape different from a circle, preferably an ellipse shape.