US2217247A

US2217247A - Machine for making sandpaper and other abrasives

Info

Publication number: US2217247A
Application number: US466124A
Authority: US
Inventors: Burns Walker
Original assignee: Behr Manning Corp
Current assignee: Saint Gobain Abrasives Inc
Priority date: 1930-07-07
Filing date: 1930-07-07
Publication date: 1940-10-08
Anticipated expiration: 1957-10-08

Description

Oct. 8, 1940. w, BURNS 2,217,247

MACHINE FOR MAKING SANDPAPER AND OTHER ABRASIVES Filed July 7, 1930 2 Sheets-Sheet 1 36 Fig. 7

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MACHINE FOR MAKING SANDPAPER AND OTHER ABRASIVES Filed July 7, 1950 2 Sheets-Sheet 2 Fig. 5 gva/vento@ Wel/Z276?" BU/7705 attoznu Patented ot.s,194o 2,217,247

MACHINEv FOR MAKING SANDPAPER AND OTHER lABRASIVES Walker Burns, St. Paul, Minn., assignor, by direct and mesne assignments, to Behr-Ma.n ning Corporation, Troy, N. Y., a corporation of vMassachusetts Application July '7, 1930, Serial No. 466,124

3 Claims. (Clf 91-44) My invention relates to making sandpaper and out and which causes the abrasive material to other abrasives, where it is desired to provide be projected against the sheet carrying the a sheet-like material with an abrasive surface on abrasive. This may be accomplished by` the one side, such as sandpaper, emery cloth and apparatus A which is provided with a casing 5 other abrasives, and to provide a means for forming the enclosed compartment B in which making the sandpaper or other abrasives of a the table I0 is positioned. The table Ill is adapted more efficient nature and in a simple manner. to support an endless belt II which travels over A feature of my invention resides in the means the driving pulley I2. The driving pulley I2 is for making an abrasive material consisting in adapted to be operated by a suitable electrical l0 passing a sheet, which is coated with a binder motor I3 which is positioned outside of the comw or adhesive substance, such as glue or varnish, partment B and which is connected by means of past an air operated means of blowing the ne a pulley I4 to the motor I3. particles of abrasive material against the sheet The belt II travels in the direction of the so that the particles will stand out and project arrow to extend over a blower -head C which ex- 16 from the sheet rather than lay down against tends` across between the sides of the table I0 3:; the same and pile or compact in relation to each and is of a sufcient width to correspond to the other. This permits the surplus particles of width of the belt II so that air maybe passed abrasive material to fall away from the surface from the blower head C through the belt II. to which the particles are to adhere to form the The blower head C is formed with an adjustable 20 sandpaper or abrasive material, rather than pile air outlet slot I5 which may be adjusted to the against the particles attached to the sheet to desired width so that air may be blown through k" make up the sandpaper, and thus the particles the slot I5 from the head C in a manner to force stand out like ne needles to form spaced abrasive air through the belt II. The belt II extends particles projecting from the sheet supporting the from the blower head C over the pulley I6 and same, and thereby providing a more eilicient down and over the adjustable pulley I'I. The sandpaper or abrasive material than has been pulley I1 is carried by a diagonally extending accomplished heretofore in so far as I know. brace I8 and may be adjustable upon the same The features of primary importance will be to tighten the belt II if it is desired so that the fully and clearly pointed out with those here proper tension may be maintained at all times before set forth and such others as form an upon the belt II. Any other suitable belt adjustessential part of my invention. ing means. may be EmDlOyed to keep the belt II In the drawings which I have illustrated to asat the deslred tension. sist in carrying out my method: Within the compartment B, I provide a hopper Figure 1 is a diagrammatic side view of an D for supporting a supply of abrasive material,

apparatus adaptable for carrying out my method. The hOPDel D iS formed with an adjustable gate y 1g Figure 2 is a detail of a, portion 0f the same, I9 so that the abrasive material may be uni- Figure 3 is a detail of another portion of the formly discharged out of the hopper, the same same, running over the forwardly projecting shelf 20 Figure 4 is a diagrammatic plan view of a DOStOrled belOW the gate I9.

portion of the apparatus. In the lower portion of the casing or compart- Figure 5 is an end view of Figure 4. ment B, a collecting hopper 22 is provided by the Figure 6 is a detail of a portion of the appabottom wall of the casing for the surplus abrasive ratus. material and by means of the air nozzle 23 which Figure '7 is an enlarged cross section of a piece is connected to a source of air by the pipe 24, of sandpaper, or cloth made in accordance with the surplus abrasive material may be blown gg my method, through the pipe 25 up to a hopper 26 which is The steps of operation of my machine for positioned above the hopper D outside of the making sandpaper and other abrasives consist Compartment B. The connection 25 may lead in carrying the fine particles of abrasive material, directly t0 the hopper D if'it is so desired, so that such as garnet, silicon carbidaxilint, aluminum the surplus abrasive material which is not used g oxide or emery, or which may be of any nature up in my methOd 0f making sandpaper and other ordinarily employed and used for the making of abrasives in the operation of the apparatus A, sandpaper, emery cloth and like materials, in an will be carried directly back to the hopper D so even spread out manner to a blower means over that the apparatus A may operate automatically which the abrasive material passes while spread and continuous to carry out my method, and pro- I;

ilo

farther away from the belt I I.

vide an abrasive material or sandpaper of the desired nature.

The sheet 28 which is adapted to form the backing or sheet of the sandpaper or other abrasive sheets to be made by my method, travels automatically into the compartment fB. passing over the

rollers

29 and 30, carried by the supporting bracket 3I on the table I0 and from the roller 30 the sheet passes back under the roller 32 and out of the compartment B. The roller 30 is adjustable on the bracket 3| by means of the slots 33 in the bracket bearing 34 for the roller 30, so that the same maybe moved closer or The roller 32 may be adjustable in the same manner if it is desired.

The apparatus A operates to carry the fine abrasive particles spread out on the belt II to the blower head C. 'I'he belt I I may be made of any suitable material so that air may pass through the same from the blower head C and yet of such a nature as to carry the abrasive material from the hopper D evenly spread out to the backing sheet 28. As the belt II passes over the blower head C, the air from the same passingout of the slot I blows the ne particles of abrasive material up against the backing sheet 28 which has been previously coated with an adhesive material, such as glue or varnish, or any other waterproof binder, before entering into the compartment B, and as the fine particles of abrasive material such as 36 are blown up against the sheet,

they stick to the same by reason of having been shot up like darts against the binder which may be of any material, causing them to project outrather than lay down flat against the sheet as in sandpaper and abrasive sheets made by the old method. 'I'he surplus abrasive particles 36 will quickly and readily fall away from the backing sheet 28 and be gathered in the hopper 22 and automatically carried back to' the hopper I26 or directly to the hopper D.

The sandpaper, emery cloth or similar material formed by my machine, such as is illustrated in Figure 7., has a better cutting quality, is more effective in its operation, and can be made economically. When the particles are blown to the backing sheet, either for plain or water-proof sandpaper or fabric, in the manner set` forthl in my method, they do not collect one against the other but the adhesive surface of the backing sheet will just take up the right number of particles to make the most effective and efficient abrading surface for sandpaper or other similar sheet abrading materials.

In accordance with the patent statutes, I have endeavored to describe my apparatus, and while I believe the apparatus that I have set forth is the best embodiment of my invention, I desire to have it understood that the same may be varied within the scope of the following claims without departing from the spirit, purpose and intentof my invention.

I claim:

l. The new article of manufacture in apparatus for making sandpaper or emeryy cloth, comprising, a `hopper for abrasive particles, an opening from said hopper to feed a thinlayer of the abrasive particles out of said hopper, an endless belt adapted to pick up the thin layer of abrasive particles, a blower beneath said endless belt adapted to blow the abrasive particles off of said belt, means for adjustably carrying the exible backing sheet of the sandpaper or the like with a coat of adhesive over the surface thereof exposed at a point adjacent said blower and endless carrier, whereby the abrasive particles carried by said belt are blown by said blower into the surface of the adhesive on the flexible sheet to automatically coatthe surface of the sheet with the abrasive particles standing out individually one from the other.

2. The new article of manufacture in apparatus for making sandpaper or emery cloth comprising, a hopper for abrasive particles, an opening from said hopper to feed a thin layer of the abrasive particles out of said hopper, an endless belt adapted to pick up the thin layer of abrasive particles, a blower beneath said endless belt adapted to blow the abrasive particles off of said belt, means for adjustably carrying the flexible backing sheet of the sandpaper or the like with a coat of adhesive over the surface thereof exposed at a point adjacent said blower and endless carrier, whereby the abrasive particles carried by said belt are blown by said blower into the surface of the adhesive on the flexible sheet to automatically coat the surface of the sheet with the abrasive particles standing out individually one from the other, a hopper for receiving surplus abrasive particles from said endless belt, and means for pneumatically conveying said surplus abrasive particles from said last-mentioned hopper to said first-mentioned hopper.

3. The new article of manufacture in apparatus for making sandpaper or emery cloth comprising, a hopper for abrasive particles, an opening from said hopper t'o feed a thin layer of the abrasive particles out of said hopper, an endless belt adapted to pick up the thin layer of abrasive particles, a blower beneath said endless belt adapted to blow lthe abrasive particles oil of said belt, means for adjustably carrying the flexible backing sheet of the sandpaper or the like with a coat of adhesive over the surface thereof exposed at a point adjacent said blower and endless carrier, whereby the abrasive particles carried by said belt are blown by said blower into the surface of the adhesive on the flexible sheet to automatically coat the surface of the sheet with the abrasive particles standing out individually one from the other, a hopper for receiving surplus abrasive particles from said endless belt, means for pneumatically conveying said surplus abrasive particles from said last-mentioned hopper to said first-mentioned hopper, and a Wall structure enclosing said endless belt, said blower, and carrying means for the flexible backing sheet, a portion of said wall structure forming said hopper for the surplus abrasive particles received from said endless belt.

WALKER BURNS.