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Патент USA US2405749

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Aug. 13,1946.
_ KERN
' '
SQUARE FINISH PHOT — NGRAVED HALFTONE PRINTING
PLATE AND THE METHOD OF MAKING ‘SAME
Filed Sept. 2, 1943
2,4053%
2,4534
Patented Aug. 13, 1946
UNITED ‘STATES PTEZNT
2,405,749
SQUARE FINISH PHOTOENGRAVED HALF
TONE PRINTING PLATE‘ AND THE METHOD
OF MAKING SAME
Lawrence Kern, Philadelphia, Pa.
Application September 2, 1943, Serial No. 501,010
2 Claims. (0]. 101-4013)
2
1
My invention_relates to a new and useful square
rounded by etched or engraved portions. .All of
?nish photoengraved halftone printing plate and
. this is as usual and is produced in the well known
the method of making same, and has for one of
manner.
Heretofore the material of. the plate has been
its objects to provide an original halftone print
cut away on the face by a beveler and a trim
ing plate having a rounded edge.
ming tool to define a border. This produces a
Another object of the invention is to provide
sharp outside edge and because of the natural
a halftone printing plate in which the printing
tendency of paper to sink down over these lower
surface, composed of dots, is rounded along the
edges, it requires additional work for the printer
edges to produce shading off portions that result
in soft line borders in the impressions.
10 to prevent the formation of a dark or black out
line. At present the printer overcomes this dif
Another object of the present invention is to
?culty, to some extent, by the “overlay” or “un
provide a novel method of making a rounded edge
derlay” which reduces the pressure along the
on a halftone printing plate.
edges but very often with unsatisactory results.
A further object of my invention is to produce
I completely overcome these difficulties and
eliminate the use of “overlay” or “underlay” by
beveling or cutting away portions of all of the
the plate to form a relatively thin rim and turn
edges of the plate at the back, as shown at ‘I,
ing said rim down to form a depressed border
Fig. 2, thereby forming a thin rim 8. This rim
resulting in a rounded edge blending into the
central printing surface.
20 8 is bent or turned down by applying pressure,
through the medium of a suitable instrumentality
A still further object of the invention is to pro
9, at or adjacent the margin of the rim, but re
duce an original photo-engraved halftone print
moved or spaced from the inner extremity of
ing plate as an article of manufacture by a new
the beveled or cut away portion, until the lower
method which forms a rounded edge so that the
printing surface dots gradually recede from the 25 or inner face of the outer portion of said rim
becomes ?ush with or lies in the same plane as
central printing area whereby an impression made
the back of the main portion of the plate. This
therefrom will have a soft gradually shading off
produces the attaching ?ange l0 and the rounded
border.
edge l l between said ?ange and the central print
With the above and other objects in View this
ing surface. The rounded edge H thereby be
invention consists of the details of construction,
comes a de?nite part of said central printing sur
combination of elements and the steps involved
a rounded edge on a halftone printing plate by
beveling or cutting away portions of the back of
in the production of the printing plate, all here
inafter described and then designated by the
face and includes some of the raised area or dots
so that an impression made from the plate has a
soft outer edge because of the blending of the
.
In order that those skilled in the art to which 35 high lights with the vignettes without harsh, hard
or sharp and de?nite lines of demarcation.
this invention appertains may know how to make
A printing plate made by my method is no more
and use the same, I will describe a construction
expensive than an ordinary one and is cheaper
in detail and a method of producing such con
in the long run because many more impressions
struction, referring by numerals to the accom
panying drawing forming a part hereof, in which: 40 can be obtained therefrom since, generally, the
claims.
Fig. 1 is a cross sectional view of a photo-en
outer edge is the part of the plate that usually
graved halftone printing plate made in accord
ance with my invention.
wears out fastest. A highly important feature
of my invention is that the troubles usually ex
graved halftone printing plates.v The printing
as new and useful is:
perienced by» printers with the sharp edge print
Fig. 2 is an enlarged fragmentary sectional view
of the plate after being beveled or cut away at 45 ing plate are automatically overcome when my
rounded edge printing plate is employed.
the back.
Of course I do not wish to be limited to the
Fig. 3 is a similar view after the rim has been
exact details of construction herein shown and
turned down to provide the?nished product, and
described as these may be varied within the scope
illustrating the ?nal step of the process.
In carrying out my invention as herein em 50 of the appended claims without departing from
the spirit of my invention.
bodied, 5 represents a zinc or copper plate such
Having described my invention what I claim
as generally used for square ?nish photo-en
1. The method of producing a rounded edge on
surface is composed of a multiplicity of so called
“dots” 0 which, in effect, are raised areas sur 55 an original photo-engraved halftone printing
2,405,749
3
plate which consists in beveling the straight edge
on the back of the plate, and then turning the
edge down by suitable pressure on the printing
surface to form a rounded edge that carries the
dots over the edge until it softly removes itself
automatically from printing contact.
2. An original photo-engraved halftone print
ing plate provided with a printing surface on its
front face, an inclined portion of said plate bor
4
dering the central portion thereof, and an at
taching ?ange projecting from the inclined por
tion, said flange and inclined portion being con
structed from a thin rim produced by rabbeting
the underside of the edge of the plate, which
rim is subsequently bent to the desired con?gura
tion.
LAWRENCE KERN.
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