US1661518A - Grid bar for fiber-treating machines - Google Patents

Description

M. WEHLI GRID BAR FOR FIBER TREATING MACHINES Fil9d A112. 18. 1926 IMF/7M: //0 M1 3 M 1 11 5/ JIM/IE) Patented Mar. 6,1928.

UNITED STATES MORRIS WEHLI, OF BASED, SWITZERLAND.

GRID BAR FOR FIBER-TREATING MACHINES.

Application filed August 18, 1926, Serial No. 130,060, and in France January 28, 1926.

This invention relates to bars for the grids of machines for opening, clean1ng,'beatmg,

carding or parallelizing cotton waste and other kinds of fibers.

The object of the invention is to provide an improved construction of grid bar whereby the removal of waste or impurities from the fibers is facilitated and the presence of dead spaces or eddying spaces between the bars is obviated, so that impurities or fibers are prevented from adhering to the sides of the bars.

With this end in view, the present invention consists in the provision of grid bars which are constructed with a stream-line surface, in order to allow the incoming streams of air to pass through the spaces between them without eddying and without the occurrence of dead spaces, in such a manner that between the entry of the air streams into the grid or grating'and their exit therefrom, a reduction in velocity and a drop n pressure take place due to the increase in cross-section of the spaces between the respective bars.

Reference will now be made to the accompanying drawings, in which Figure 1 represents, as an example, a vertical cross-sectional view of a grid for a card breaker of known type made up of such bars; and Fig. 2 is a detail view,.partly in sectional pen spective, showing the mounting of a bar.

As will be apparent, the said grid presents the peculiarity of being constituted by bars A comprising at their upper part a rim or flange B and, below said flange, over the whole or a part of their length an inwardlycurved recess C, the section of which may advantageously (but not necessarily) have the shape represented in Fig. 1; suchrecess being formed in the inside portion of the bar between the flange or rim B and the bottom edge of the bar. Any suitable means may be employed for supporting the bars.

The aforesaid recess C is arranged transversely to the current of air, and it gives to the bars a stream-like form, so that the air streams sweep entirely over the whole of the grid bars and thus prevent dead or eddying spaces being formed, and also prevent any impurities rom adhering to the bars. The increase in the cross-sectionof the grid space or opening effects a change in velocity of the air and also a drop in pressure between the entry and exit of the air into and from the grid, this action freeing the fibers from their impurities which fall through the grid.

The purpose of the present invention is to imprison air, retarding its entry into the grid, in order that the impurities which are heavier than the fibers will be more eiiicientl y separated and fall under thegrid, while the fibers will remain on the grid and be carried further on. Owing to the operation of the licker-in or of the beater,'the air drawn in is throttled in recesses C so that a forcing back of air takes place, producing a dead point and helping to expel the impurities. Bars constructed as above will also prevent cotton as well as impurities or other matter from sticking on the ends of the bars, so that any short fibers and impurities that might happen to gather will drop through their own weight instead of adhering to the bars or being drawn into the mechanism of the machine, as is the case with hitherto-known grids.

I claim as my invention:

1. A grid for scutchers, beaters, carding machines and the like, embodying grid bars which, in order to allow the incoming streams of air to pass through the spaces be tween the bars without eddying and Without the occurrence of deadspaces, have their inside portions, between the top and bottom edges thereof, constructed with a stream-line surface producing an increase in the crosssectional area of said -grid spaces, so that between the entry of the streams into the grid and their exit therefrom a reduction in velocity and a dro in ressure take place.

2. A grid according to claim 1, in which the inside portions of the grid bars are hollowed out to form the stream-line surface, so that the point of greatest depth of such surface corresponds to the point of largest cross-section of the space between two consecutive bars and of minimum air speed, and the streams of air entering into the grid flow through the latter without forming dead or eddying spaces.

In testimony whereof I aflix my signature.

MORRIS WEHLI.

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