US1808794A - Means for spreading cut tobacco - Google Patents

Description

June 9, 1931. F. H. B. STELZER 1 8,

I MEANS FOR SPREADING CUT TOBACCO Filed July 8, 1929 Patented June 9, 1931 UNITED STATES UPATT ENT OFFICE FRANZ HEINRICH BENITO STELZER, F DRESDE'N, GERMANY, ASSIGNOR .TO THE FIRM UNIVERSE-LL11" CIGARETTENIJIASGHINEN-FABRIK J. C. MULLER & 00., OF DRESDEN,

GERMANY MEANS FOR- SEREADING CUT TOBACCO Application filed July 8, 19-29, Serial No. 376,703, and. in Germany July 5, 1928.

This invention relates to means for spreading cut tobacco.

In order .to take care of the tobacco in tobacco spreaders and to protect the fibres from being torn apart it has been proposed to move a travelling sieve band or the like subjected to suction action past the tobacco supply on which band thetobacoo fibres from the hopper settle so as to form a tobacco 1o fleece on the band and on the further movement of the sieve the suction action is interrupted so that a uniform stream of tobacco is delivered in the form of a band by the sieve to a further conveyor.

In order to ensure the separation of the tobacco fleece from the moving sieve band i I have already proposed that at the point where the suction action is interrupted a jet' should be provided to force compressed air through the openings in the sieve band and blow the tobacco fleece off the sieve band.

For the purpose of simplifying the apparatus, in accordance with the present invention the tobacco fleece formed on the moving sieve band is supported adjacent thedelivery point by a moving band or the like impervious to air which remove-s the tobacco fleece from the suction action. In this manner the use of a compressed air jet is rendered superfluous.

One embodiment of the new device is illustrated in vertical cross section in the accompanying drawing.

Referring to the drawing, the operative flight of the sieve band 5 which travels over the rollers 34, and 36 is under the suction action of the suction b01439 so that tobacco is sucked from the container and fed forward as a tobacco fleece by the sieve band.

The tobacco fibres are straightened by the jet 14 by air under pressure. The brushing roller 16 brings the fleece to the desired thickness. Before the sieve band reaches the rear edge 17 of the suction box the feed band 19 which is guided overthe rollers 20 and 21 comes from beneath and rests on the tobacco fleece. The band 19 is of a material which is impervious to air so that the suction action is interrupted adjacent this band. Adjacent the roller 35 the bands 5 and 19 which are moving at the same speed separateand the tobacco fleece rests under its own Weight on the feed band 19 from which it is delivered to the usual grooved conveyor V Iclaim, g

1. Means'for spreading cuttobacco comprising in combination with a sieve band subj ected to suction action and serving to form a tobacco fleece, an impervious feed band disposed adjacent'thedelivery point of the sieve 1 band, said impervious band interrupting the suction action adjacent the delivery point. of

said sieve band, and serving to carry thetobacco fleece out ofthe'range of the suction action exerted on the sieve band. I

2. Means for spreading cut tobacco into a fleece comprlslng 1n comb1nat1on,a travelling sieve band, a portion of Which is subjected to suction action,.means for feeding cut tobacco to said band, means for straightening said out tobaccoas it is picked up by said band, means for regulating the thickness of the fleece carried by said sieve band and means for carrying said fleece out of range of the suction acting through said sieve band,

said last named means comprising an impervious feed band disposed closely to the sieve band and overlapping a part of said suction actuated portion of the sieve band adjacent the delivery point of the latter.

3. Means for spreading out tobacco comprising a travelling sieve band, a portion of which is subjected to suction action, means for feeding cut tobacco tolsaid band, said tobaccov being carried by the latter in them form of a fleece and means for delivering said fleece to a further conveyor, said last named means comprising an impervious feed band I disposed closely tothe sieve band and over lapping a part of the suction actuated .por- -:-1

tion of the said sieve band adjacent the delivery point of the latter, whereby suction action will be cut off at the overlapped part of said sieve band and said fleece will be carried off the latter by said impervious band.

4. Means for spreading out tobacco com prisinga travelling sievexband, a portion of.

which is subjected to suction action, means for feeding cut tobacco vto said band tobe v carried by the latter in the form of a fleece,

nieans for regulating the thickness of said fleece on said band and means for delivering said fleece to a further conveyor, said last named means comprising an impervious feed band disposedclosely to the operative flight of said sieve band and-overlapping a part of the suction actuated portion of said sieve band adjacent the delivery point of the latter whereby suction action Will be out be at the overlapped 'part of the sieve bandand said fleece will rest on said impervious band and be carried off said sieve band.

5. Means for spreadingrcut tobacco com-I prising a travelling perforated element, a

portionof which is subjected to suction action, means f or feeding cut tobacco to said element, said tobacco eing carried by the latter in the form ofa fleece and means for delivering said fleece to a further conveyor, said last named means comprising an unpervious feed element dlsposedclos'ely t'othe perforated element and ov rlapping apart 7 of the suction actuated portion of said perfora ted element'adjacent the delivery point of'the'latter, whereby si'ictionvvill be cut off at the overlap ed part of said perforated ele- 1116111; and. San fleece will be carried off the latter'by said impervious element.

Signed at Dresden this 14th day of FRANZ HElNRI H t me SnaZER.

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