US1773949A - Photogravure roll - Google Patents

Description

Ang. 26, 1930. L. v. cfAs-ro PHOTOGRAVURE ROLL Filedk Aug. 10 1928 FWG? ' 'n/7d a 5M:

llvatenvted Aug. 26, 193

UNITED STATES* A'PAT,l-:NT OFFICE LLOYD V. GASTO, OF DETROIT, MICHIGAN, ASSIGNOR TO OXFORD 'VAR-.NISE CORPORA- TIoN, oFnErnorr, MIGHIGAN, A conPoRA'TIoN or mrcHIGAN' PHOTOGRAVURE BOLL Application led August 10, 1928. Serial No. 298,800.

This invention relates to a'printing roll,

' specifically to a pattern roll for photogravure 'thin sheet metal p ate may be supportedin and like printing machines. An object is to rovide a roll whereby a' enveloping relation to the roll core in such manner that a doctor blade or similar device may bear continuously on the roll without substantially altering its position relative to the axis of the roll.

A further object is to provide an improved and simplified device for attaching sheet metal pattern plates toa large roll.

Further objects will become apparent from the following description relatin to the accompanying drawing, wherein show the preferred form of my invention. The essential characteristics are summarized in the claims.

In the use of etched plates for wood graining it is sometimes Y, necessary to make the plate of very large dimensions, in order to grain large-panels, such as building doors,

and other panel work in buildings. l In the' use of the pattern roll, it is ractically essential to apply pigment to t e plate in ade- -uate quantities to insure the printing of t e full pattern and to then work the material as by a doctor blade which also scrapes the surplus pigment from the roll.

An effective doctor blade has been found to i comprise a resilient metal plate suitably suported with its free edge at an angle to and 1n forcible contact with the surface of the roll.

Most devices for attaching an etched plate curing the edges o the plate inwardly from the printing surface, yet which will n'ot permit the doctor blade toA drop in.` This con'- sists primarily in forming the groove and the edges of the pattern plate on a bias, so that, at least one portion of the blade will rest on the high part of the roll at all times. Other novel features will be hereinafter mentioned.

In the drawings, Fig. 1 is an end elevation of a pattern roll showing the plate in place thereon, and the relationship of a c'onvenient doctor blade thereto; Fig. 2 is a plan view of the roll and blade, and Figs. 3 and 4` are fragmentary sectional views, as indicated by the lines 3-3 and 4-4 on Fig. 2. l

Referring in detail to the drawing, the frame of the roll may comprise end discs, such as 1, there being two of these, one at each end o'f the rollgand supported on a conpreferably wood,such as shown at5 in Fig. 3

secured at their ends to the discs. The pattern platefP is wrapped about these strips and heldsecurely at its ends.

In order that the ends of the pattern plate may be dropped inwardly from the pigment receiving surface of the roll, the stri s 5 are abutted by' separated edge strips 6 orming in effect a V groove. The'edge strips 6 are provided with metal reinforced edges in the nature of inserts 7 over which the ends of the plate pass and bend inwardly, as at P. The

end discs 1 are cut out, as at`8, and subtending the discs at the bottom of the cut-out portions is a heavy cross bar 9. f The ends of the pattern plate are held in place by the cross The preferred means for fastening the ends of the pattern plate comprises overlapping the ledges of the plate, las at P2 and clamping the same betweenmetal cleats or strips 10 and 11. The outermost` of these cleats, namely 10, is rounded on its underside in order to. `prevent excessive weakening of the plate by sharply bending it. VThe cleats are mutually held together as by screws 14 which simply pinch the cleats together onto the overlapping -edges of the plate. Both cleats have through openings for screws 12 which pass into threading engagement with the bar 9 as at 13 to adjustably draw the the pattern plate to tightly ire peripheral surface of the embers forming the Vplate et one deserihed, are skewed relaairis, as shown in 2.

may h heing preferably a recipreeating e reeprocating means showA it oie means :for urging the blade roll may he a 23 rigit. errangeei to he drawn v d 34, will suffice for ii'- stration. i

The doctor the shait line 20'", Contact l clear thn into the r one end e rests on the nigh surface at one side of the groeve, and the other end rests on high. surface at the other end of the grooifeA is the roll is turned from this position, one extreme edge will not he snp ported, lont by' this time there will he a6e quate support at the other end to entirely' sustain the Mede,

I claim:

1. A. pattern roll construction eoinprising a pair of end plates, and en axle pessing therethrough, a shell supported by said. end plates and extending substantially about the plates but separated at one sideof the roll, V notches in the endL plates at said point of separation, a cross barseeured in the bottom of the notches and'subtending the plates, a sheet metal, pattern plate, and means for clamping the ends of a pattern plate, there being spaced means engaging said cross har and arranged to draw the said clamping means inwardly towardy 'the center offthe rol 2. vAr pattern roll construction, comprising wa `pair of. ehd plates, a shell supported hyv said end plates, said shell having an opening therein, a bar supported by said end plates within thebody ofthe roll and adjacentthe opening, \a metal strip embracin the roll, a pair ofsuperpose'd clamping c eats in pinching relation to 'the strip, means to hold the cleats together on the strip, and adjustable members engaging one of the cleats and said bar to draw the cleats inwardly toward the center of he roll.

In testimony whe eof, I hereuxnto ailix my signature.

LLOYD V. GASTO.

mrs-,eee

mounting ier the doctor bladeI

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