US1929127A - Striping knife - Google Patents

Description

J. S. TURNER STRIPING KNIFE Oct. 3, 1933.

Filed Feb. 25. 1930 vlllvttlalll l Patented Oct. 3, 1933 STBIPING KNIFE John Stanley Turner, Newburgh, N. I, assignor to E. I. du Pont de Nemours & Company, Wilmingto 1!, Del., a corporation of Delaware Application February 25, 1930. Serial No. 431,138

1 Claim.

This invention relates to an apparatus and a method for striping sheet material and more particularly to a method and an apparatus adapted to stripe a continuously moving sheet of coated cloth or paper.

In applying stripes for decorative purposes to sheet material having a pyroxylin (nitrocellulose) or similar coating, it has heretofore been the practice to apply a second coating having a color different from the base coating and then to scrape off the second coating with a knife or blade having indentations along its edge corresponding in width and position to the stripes desired. In this method of striping the stripes comprise that portion of the second coating lying in the path of the indentations or notches. The striping has also been attempted with an embossed or serrated roller.

This invention has for an object a striping knife adapted to apply colored coating compositions of jelly-like consistency such as those comprised of the pyroxylin mentioned, or of other similar cellulose derivatives only along that portion of the sheet material desired to be striped. A further object is to provide a means for varying the quantity of the striping matter deposited. A still further object is a striping knife capable of simultaneously depositing stripes of different colors. Other objects will appear hereinafter.

These objects are accomplished by the following invention in which a receptacle having a relatively narrow elongated sheet material contacting portion, preferably in the form of a trough, is provided with openings along or adjacent the contacting portion or apex of the trough which lead to the colored coating composition in the receptacle and through which it is deposited on the moving sheet material passing under and partially covering the openings, the eifective size of the openings and consequently the amount of striping material deposited being regulated by the tilt of the contacting portion of the receptacle.

In the drawing:

Figure 1 is an isometric view of my improved striping knife mounted in operative relation to the material to be striped.

Figure 2 is a section through the line 22 of Figure 1.

Figure 3 is an elevation of the striping knife as viewed from the front of Figure 1 or Figure 2.

Figure 4 is a view of the relatively adjustable supporting brackets.

Figure 5 illustrates a modified form of the invention and Figure 6 shows a further application of the invention with the apparatus illustrated in Figure 1.

In the drawing my improved striping knife is illustrated as being of elongated trough like form comprising two angularly related plates or walls 1 and 2 conveniently formed by bending a piece of sheet metal to the proper shape. The trough or receptacle formed by the walls 1 and 2, however, may be made of heavier metal or of metal especially chosen for its wearing qualities. One or more holes forming passages 3 pass through the receptacle adjacent the apex of the trough for the exit of the coating material and its deposition on the sheet material which passes under the striping knife in the direction indicated by the arrow in Figure 2. The coating material is retained within the trough by bulkheads 5 preferably made of rubber.

The knife is mounted for tilting movement to regulate the effective size of the opening at the bottom of the passages 3 through which the coloring material may flow forwardly on to the sheet material being striped. It will be apparent that the quantity of the coloring material flowing out of the openings at the bottom of the passages 3 will be a minimum when the openings are completely covered by the horizontally moving sheet material 4. As the knife is tilted, the exposed portion of each of the openings at the lower ends of the passages becomes larger as more and more of the area of the openings is separated from the sheet 4 and permits more of the coloring matter to flow through the passages. This forwardly directed opening between the sheet 4 and the opening at the lower end of each passage 3 formed by the separation of the front lower portion of the trough adjacent the apex from the paper is indicated at 51 in Figures 1 and 2.

The adjustable tilting and supporting means is shown as comprising a heavy supporting bar 6, a bracket 7 rigid therewith which is adjustably mounted on a bracket 8 forming a part of a stationary supporting means for the entire structure. For the sake of clearness, the supporting and tilting means are shown only at the left side of Figure 1, but it is to be understood that similar supporting means are preferably provided at each end of the knife. The bar 6 may be of wood and is made quite heavy to impart rigidity. The plate 1 of the knife is secured against the front face of the bar 6 by means of screws '71 as indicated in Figure 2. The corresponding brackets for the right hand end of the bar 6 as viewed in Figure 1 are indicated by the characters 7a and 8a in Figure 3. The brackets 8 and 8a have supporting extensions indicated at 9 and 9a adapted to be clamped to or otherwise constitute a part of the support for the knife. The brackets 7 and 7a have holes 10 and the brackets 8 and 8a have holes 11 for the reception of a pivot pin. The brackets 7 and 7a are held in adjusted position with respect to brackets 8 and 8a within the limits allowed by arcuate slots 111 by means of bolts (not shown) which are carried in holes 12 of brackets 8 and 8a and ride in the slots 12, the clamping of the brackets together being effected by tightening the nuts on the bolts as will be readily understood. The coated sheet material 4 to be striped unwinds from a supply roll 13 and after over the idler roller 14 horizontally beneath the knife to the winding roll 15 to which roll a source of power (not shown) may be connected. The knife is lowered into position until it touches the paper and bears thereon suihciently to form a slight depression or trough in the paper along the line of contact'as indicated in Figure 2. The extensions 9 and 9a are then clamped to any suitable supporting means which preferably embodies a vertical adjustment for raising and lowering the knife. The amount of tilt given to the knife will depend upon the consistency of the jelly in the trough and the thickness of the jelly that it is desired to deposit. The rate of movement of the paper is also a factor that enters into the regulation of the apparatus. The size of the effective openings 51, through which the coating material flows, between the sheet 4 and the lower openings of the passages 3 formed by tilting the knife is regulated in accordance with the speed of the paper so that the paper will drag along the desired thickness of striping jelly.

The stripes formed on the sheet material 4 as it passes beneath the striping knife are indicated at 16 in Figure 1. The sheet material then passes through a drying chamber illustrated diagrammatically at 1"! heated in any conventional manner as by steam coils the inlet and outlet of which is designated by the numerals 18 and 19. The dimension of the drying chamber in the direction of movement of the sheet 3 is considerably larger than that indicated on the drawing where the chamber is shown as broken to conserve space. This dimension of the drying chamber is proportioned with respect to its temperature and with respect to the rate of travel of the sheet 3 so that the freshly deposited and wet striping material is completely dried when it emerges from the drying chamber.

While the striping knife shown in Figure 1 has a length equal to the width of the paper, the knife is usually of greater length so as to accommodate papers of various widths. The removable rubber bulkheads 5 are inserted within the width of the paper to prevent the coloring matter from escaping out of the ends of the trough. If the particular striping knife used has no holes extending beyond the paper, it is then,

of course, unnecessary that the bulkheads be positioned within the width of the sheet 4 and they may remain at the ends of the trough beyond the edge of the paper.

My improved form of striping knife and method of applying the stripes are also adapted for the simultaneous formation of stripes of different colors. Several of the bulkheads 5 exactly fitting the inside contour of the trough may be inserted to form two or more chambers each of which opens through one or more of the passages at the bottom of the receptacle or trough to the sheet material 4. Each of the'chambers may contain coloring material different from that contained in any of the other chambers or any desired arrangement of stripes of diflerent colors may be'made. For instance, as shown in Figure 8, two additional bulkheads 5 are shown and the four bulkheads divide the trough into three chambers 5' each of which communicates with one or more of the passages 3 for the formation of differently colored stripes, the colors of which may alternate in any desired sequence or design. Figure 6 illustrates a form of the invention in which the trough is divided longitudinally by a partition 20 forming two chambers 21 and 22 each of which communicates with openings along the apex of the trough by means of the ducts 23 and 24. Any desired number of these ducts may pass from either chamber to the apex, and the openings along the apex from the ducts of one chamber may alternate with or be otherwise so positioned and spaced with respect to the openings from the ducts -of the other chamber so as to produce any desired pattern from the differently colored material contained in chambers 21 and 22.

My improved apparatus and method of direct deposition make possible a saving in striping material because the second coating applied before scraping in the usual practice is necessarily wider than any of the stripes to be formed and where the sheet is first coated throughout its width before coating, the saving is considerable. The

stripes formed in the practice of my invention have also a definition and sharpness not possible to obtain by the scraping method, because it is not possible for the contacting portions between the notches of the blade or knife to scrape the second coating entirely of! and this inability to effect a clean scraped surface is aggravated by the pool of jelly which collects in front of the blade. It is also diilicult to free a piece of lint or other foreign matter that has become lodged in a notch of the knife during the scraping operation and which prevents the proper functioning of a portion of the knife. When the striping is done by means of an embossed or serrated roller, the edges of the stripes on smooth sheet material are smeared'and the stripes formed on embowed material are still more unsatisfactory. My improved striping knife forms stripes having clean cutedges on embossed as well as smooth goods. It is possible with my improved device to apply stripes of two or more colors regularly spaced in one operation and the design formed by the arrangement of colored stripes may be simple or complicated whereas by the method previously used it was possible to apply two col ors only by applying first one color, then chang ing the knife and afterward applying the second color in another operation. A complicated design cannot be produced by this meansbecause it is impossible to obtain perfect registration of the second coating with respect to the first.

As many apparently widely different embodiments of this invention may be made without departing from the spirit thereof, it is to be understood that I do not "limit myself to the specific embodiments thereof except as defined in the appended claim.

I claim:

A striping mechanism comprising means directing a continuously moving strip of sheet material in a substantially horizontal plane, a trough having openings along the apex thereof arranged transversely of said sheet material and positioned to contact the sheet material with portions of the openings uncovered by the sheet material and presented above the plane thereof toward the side of the line of contact of the trough with the sheet material in the direction of movement. of

the sheet material, and adjustable means supporting said trough operable to increase and decrease the portion of the openings covered by the sheet material.

JOHN STANLEY TURNER.

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