US2176607A - Glue spreader - Google Patents

Description

Patented 17,' 1939 UNITED STATES PATENT OFFICE anni spammen.

^ Eugene G. Daley, Riishville, Ind., assigner to Chas. E. Francis o., Rushville, Ind., a corporation of Indiana Application May 9, 193s, sensi No. 206,734

Claims.

In applying my invention to an applicatorl member in the form of a roll, I form the glueapplying roll, or at least-the outer portion thereof,

l5 of some resilient material such, for example, `as

soft rubber. In the cylindrical surface of such resilient material I provide` a multiplicity of recesses or pockets adapted to convey glue to the work, and I force such roll against the work with a .force suicient to compress the resilient material at the surface of`the roll and thereby to reduce the effective volume of the recesses. De-

sirably, the recesses in the surface of the glueapplying roll are in the Vform of longitudinally extending grooves triangular in cross-section and closely spaced so that the ribs of resilient material between adjacent grooves will also be generally triangular in section.

The accompanying drawing illustrates my invention: Fig. 1 is a fragmental elevation of a portion f a glue-spreading machine illustrating one of my improved glue-applying rolls in contact with a board; Fig. 2 is aside elevation of a roll embodying my invention; Fig. 3 is a fragmental longitudinal section of the roll illustrated in Fig. 2; and Fig. 4 is a fragmental transverse section of a niodied form of roll.

In this application, I have not attempted to illustrate details of the complete glue-spreading machine, for the construction of such machines is well known. See, for example, the machine illustrated in my co-pending application Serial No. 206,735, filed May 9, 1938. In such a machine, a glue-applying roll III rotates in contact with a supply of glue to become coated therewith, and

a scraper bar or doctor roll (not shown) is associated with the glue-applying roll to regulate the thickness of the glue-lm retained by the applicator roll and carried on its surface to its point of contact with the work. As indicated in Fig. 1, the work is in the form of a board II supported from beneath on a second roll I2 which may or may not be used for the purpose of applying glue to the lower surface of the board.

'I'he glue-applying roll is formed of, or at least has an annular covering I3, of resilient material such as soft or cushioned rubber; and in the outer surface of this resilient material the roll is provided with a multiplicity of recesses or pockets, here shown in the form of grooves Il approxil mately triangular in cross-section. These grooves are preferably closely spaced so as to leave between them ribs or ridges I5 which are also approximately triangular in cross-section. K

In the vuse of a roll such as has been described. 10

the grooves I4 become filled with liquid glue as the roll rotates in contact with the glue supply, and such glue is carried in the grooves to the point of contact with the board or other object to which it is to be applied. 'I'he yglue-applying l roll is forced against the board II with sufilcient force to compress the ribs or ridges I5, s is clearly indicated in Fig. 1. This radial compression of the ribs I5 results in an increase in their circumferential thickness which, in turn, 20

.causes a reduction in the cross-sectional area of the grooves Il over that portion of the surface of the roll which is in contact with the board/I I. The reduction in the cross-sectional area of the grooves Il places the glue therein under a con- 25 siderable pressure causing it forcibly to enter the pores of the board.

The hydrostatic pressure generated as the grooves I4 are reduced in volume tends not only to force theglue into the pores of the board, but 30 also tends to cause it to flow longitudinally of the grooves. With thick, viscous glues, the resistance to longitudinal ow may be so great that only a small proportion of the glue will be displaced longitudinally of the roll. With less 35 viscous glues, however, it may be necessary to control longitudinal ilow. One means for accomplishing this end is illustrated in Figs. 2 and 3 where the continuity of the grooves Il is interrupted at intervals along the roll by annular un- 40 grooved portions I6. The face of each of such ungrooved portions, engaging the face of the board II, effects a seal preventing glue within the grooves I4 from escaping longitudinally of the roll.

- Another method of preventing longitudinal glue-flow in the grooves I4 is illustrated in Fig. 4 where, instead of providing an ungrooved portion I6 between axially spaced groups of grooves, the grooves in adjacent groups are staggered so that 50 each groove I4 of one group is closed at its ends vby a rib I5 on an adjacent group.

My invention is susceptible to considerable modication over and above that specifically indicated. The proportions and shapel of the 55 grooves may vary considerably; but I prefer to use the approximate proportions indicated in the drawing where each of the ribs Il has approximately the same cross-sectional area as each of the grooves Il.

I claim as my invention:

1. In a glue-spreading machine. an applicator roll having a glue-applying face of resilient material provided with longitudinal grooves of restricted cross-sectional area, a work-support. and means for forcing said roll against work on said work-support with suiiicient force to compress the resilient material between said grooves and thereby reduce the cross-sectional area of the grooves.

2. The invention set forth in claim 1 with the addition that said grooves are arranged in axially spaced groups, the grooves of each group being discontinuous with the grooves of any adjacent group.

3. II lne invention set forth in claim 1 with the addition that said grooves are arranged in axially spaced groups, the grooves of each group being staggered relatively to the grooves of the adjacent group or groups.

4. The invention set forth in claim 1 with the addition that said grooves are arranged in axially spaced groups, each group of grooves being separated from an adjacent group by an ungrooved portionof the roll-face.

5. In a glue-spreading machine, an applicator roll having a glue-applying face of resilient material provided with a multiplicity of recesses, a work-support, and means for forcing said roll against work on said work-support with sumcient force to compress the resilient material between said recesses and thereby reduce the EUGENE G. DALEY.

volume of the recesses.

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