US2050519A

US2050519A - Scraper for bands with a sensitive surface

Info

Publication number: US2050519A
Application number: US755244A
Authority: US
Inventors: Bleibler Ernest
Original assignee: Sylvania Industrial Corp
Current assignee: Sylvania Industrial Corp
Priority date: 1933-11-28
Filing date: 1934-11-28
Publication date: 1936-08-11
Anticipated expiration: 1953-08-11

Description

SCRAPER FOR BANDS WITH A SENSITIVE SURFACE Filed Nov. 28, 1954 Fig.1

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Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE.

Ernest Bleibler, Ghent, Belgium, assignor to Sylvania Industrial Corporation, Fredericksburg, Va., a. corporation of Virginia Application November 28, 1934, Serial No. 755,244 In Great Britain November 28, 1933 4 Claims.

This in ention relates in general to an apparatus for treating with a liquid sheets or films in the form of endless bands or in continuous lengths, and in particular, to such an apparatus having a scraper adapted to remove surplus liquid from the surface of such sheets or films.

It is an object of this invention to arrange the scraper so as to remove in a substantially complete way the liquid which the band might convey from one bath to the next.

It is a further object of this invention to vary and adjust within very wide limits the pressure, without there being any risk of the sheets or films with the sensitive or delicate surface being crushed or creased or there being any fear that the band may be damaged in any other way, as by the formation of streaks, scratches or the like.

According to the invention there is provided an apparatus for treating sheets or films with a liquid or liquids which comprises the combination of a treating vat containing a liquid, means to pass the sheet or film through the liquid in the vat, and a scraper positioned above the level of the liquid, the scraper comprising a pair of rotatable, preferably cylindrical, wiping members, means to support the wiping members in spaced parallel relation and means adjustable for positioning these members in wiping contact with a sheet or film passing between the wiping members. Where the sheet or film is especially fragile or has a delicate surface, the scraper may be further provided with means for resiliently holding the wiping members in contact with the surface of the sheet or film to avoid crushing or damaging the surface in any way.

The bars may be made of any material chemically inert to the wet film or to the baths, suitable materials being glass, porcelain or metal, wood, stone or artificial masses such as resins and the like.

The invention will be best understood on re? ferring to the drawing afiixed to my specification and forming part thereof which illustrates the invention as embodied in a preferred construction. It will be readily understood, however, that my invention is by no means limited to this construction and that the scope of my invention and the ambit of my appended claims extends to any construction incorporating the broad principle underlying my invention.

In the drawing:

Fig. 1 shows in transverse section the arrangement of the new scraper in the operative position on the band between two treatment baths.

56 Fig. 2 shows the scraper in the open position,

Fig. 3 is a front elevation of the scraper, while Figs. 4 and 5 are side elevations of arrangements for fixing the scraper in position in an adjustable and resilient manner.

Two successive baths are denoted by H and 6 l2 through which a band l3 to be treated, principally one with a sensitive surface, is' passed continuously. The scraper 20 is placed between 'the successive baths. It consists of two bars 2|,

22 which run parallel with each other at a disl0 tance from each other and the endless band I3 is threaded between them. The bars are mounted to rotate, preferably freely, between suitable heads or

flanges

25, 26 which are carried in their turn on shafts or

spindles

35, 36 which 15 are rotatably mounted in suitable bearings 21', 28, as indicated diagrammatically in Fig. 3.

Fig. 2 shows the scraper in the open position in which the band is threaded through it. By rotating it in the direction indicated by the ar- 20 row, the scraper is brought into the operative position, in which the underside of the band bears against one scraper 2| and the top of the band against the other scraper 22. According to the pressure with which the bars are held 25 against the band, the pressure of the scraper can be regulated as may be desired. As this pressure can be altered to any degree of fineness by slightly altering the angle which the contact surface of the two spindles of the bars makes 30 with the surface of the band, it follows that the pressure of the scraper can be adjusted to any degree of fineness, so that allowance can be made for the particular conditions existing at the time, particularly the sensitiveness or other state of the surface to be treated.

In the operative position (see Fig. 1) the bars are so adjusted and positioned with respect to the band that one bar 22 removes the liquid from the upper surface of the band l3 to be treated so that it then run back as shown at 30 over this surface into the bath I I. The scraper 2| removes the liquid from the underside of the band, theliquid falls downwards and passes at 3| on to a suitable drip pan 32, which returns it 5 to the bath H. In this way, most of the liquid carried up by the band l3 out of the bath II can be recovered without there being any risk of any appreciable quantity of liquid passing out of the bath ll into the bath l2.

By constructing the scraper with two bars arranged at a distance from each other, the sensitive band is at the same time prevented from being squeezed as it might be if as is otherwise usual, the two scraper rolls arranged opposite 66 each other are pressed together and against the band lying between them.

In comparison with the known scraper rolls there is another advantage, namely that the cost of'manufacture of the new scraper is considerably reduced, as the parts do not require to run exactly round as in the known scraper rolls, and therefore do not require such accurate adiustment, on the contrary it sufiices to provide the bars with a smooth surface and drop them loosely into their bearings. At the same time the scraper according to this invention permits 01 the scraper rolls being conveniently cleaned while it is at work, should any matter out of the baths become deposited on the surfaces of the bars. In such case it will suffice to bring the scraper into the position shown in Fig. 2, and clean the bars off, which operation, in the case of glass bars, can be carried out with an acid.

The scraper can be fixed in the operative position by any desired means, say for example by providing one or both flanges, e. g. 26, on the outside with a series of openings 38 into which a bolt or a pin can be pushed. Means may also be provided in order to resiliently hold the bars in position, for example the spindle 36 being provided with an adjusting spring 31.

Since certain modifications in the apparatus which embodies the invention may be made withfor resiliently holding said scraper in wiping position.

2. In an apparatus for treating sheets or films with a liquid, the combination of a plurality of treating vats containing liquids, means to pass a sheet or film successively through said vats in contact with said liquids, a scraper positioned to contact the sheet or film as it passes from one vat to the next, said scraper comprising a pair of rotatable cylindrical wiping members, means to support said members in spaced parallel relation, said supporting means adapted to be rotated to bring said members into wiping contact with a. sheet or film passing therebetween, and means adjustable for fixing said scraper in wiping position, and means positioned below the scraper for catching liquid scraped from said sheet or film and for returning said liquid to the vat from. which the sheet or film has just issued.

3. In an apparatus for treating sheets or films with a liquid, a scraper comprising a pair of freely rotatable cylindrical wiping members, means to support said members in spaced parallel relation, said supporting means adapted to be rotated to bring said members into wiping contact with a sheet or film passing therebetween, and means for resiliently holding said scraper in wiping position.

4. In an apparatus for treating sheets or films with a liquid, the combination of a plurality of treating vats containing liquids, means to pass a sheet or film successively through said vats in contact with said liquids, a scraper positioned to contact the sheet or film as it passes from one vat to the next, said scraper comprising a pair of rotatable cylindrical wiping members, means to support said members in spaced parallel relation, said supporting means adapted to be rotated to bring said members into wiping contact with a sheet or film passing therebetween, and means adjustable for fixing said scraper in wiping position, and a plate positioned below said scraper and adjusted as to its form to the path of the sheet or film, said scraper in its wiping position and said plate being in co-operative relation for catching liquid scraped from the said sheet or film and for returning said liquid to the vat from which the sheet or film has just issued without any dripping of liquid to a surface of the film or sheet just cleaned, or without contaminating any following bath from liquid carried along by the sheet or film of the first bath.

ERNEST BLEIBLER.