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Патент USA US2115468

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April 26, 1938.
, H. c. OSBORN
MEANS FOR ATTACHING PRINTING PLATES
Filed Oct. 15, 1936
2,1 15,468
2 Sheets-Sheet l
INVENTOR
BY
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‘(9% @Mw
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ATTORNEYS‘)
April 26, 1938.
H, c, OSBORN ;
I
_ 72,115,468 ,
MEANS FOR ATTACHING PRINTING PLATES
File_d Oct. 15, 1936
BY ‘?n/10y
>
'
2 Shéets-Sheet 2
QINVENTOIR.
@aAL?Q/nd
ATTORNEYS‘
2,115,468Ff
_ Patented Apr.'26, 1938' _
' UNITED STATES PATENT OFFICE
\
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,
2,115,468
V
MEANSYFOR. n'r'mcnme Pm?'rme m'ras
Henry C. Osborn, Cleveland, Ohio, assignor to
_ Addressograph-Multigraph Corporation, Cleve
land, Ohio, a‘ corporation of Delaware
_ ' Application October 15, 1936, Serial No. 105,754
4 Claims.
(0]. 101-4151)
This invention relates to means for securing
printing plates on cylinders of presses. The
means employed are especially'well adapted for
sharp and very acuteangle, almost [parallel with
the body of the sheet‘.
attaching very thin ?exible planographic plates,
a ?at, thin strip of metal or other strong material,
doubled backwardly on itself as at 2|. ‘The 5
5 which maybe made of metal, paper or other composition.
'
’
doubling is made by rounding the strip in the
An object of the invention is to provide an'at* taching - member which may be very. readily
mounted on‘ the plate, across the end thereof, and
10 will cooperate with an anchorage device on a suitable drum of a printing machine to enable the
plate to be drawn taut about the drum and held
thereon.
,
‘
~
The attaching device designated 20 comprises
-'
folded region in a partially tubular form, indi
cated at 22.
Such rounding extends from one
face of the strip for'substantially a semi-cylinder,
then continues toward the opposite face for sab- '10
stantially a quarter cylinder, where it merges into
a ?at portion. The end of this ?at portion is
preferably doubled inwardly as at 24 to make 2.
Another‘ object is to provide a. metal attaching smooth, reinforced edge. The head provided by ”
l5 device suitable for ready cooperation with a paper the open tubular rounding at the bend materially l5
plate so that the plate may be effectively attached stiflens the attaching device and prevents it being
without danger of it being torn or injured.
. bent or otherwise distorted.
. Still another object is to soform the attaching
In use the doubled ever end H of the printing
device that-while being readily mounted on the plate lies within the confines of the doubled-over
2 O end of the plate it will obtain vsuch grip thereon
portion of the attaching device, each thus hooking 2
that it will not allow the plate to shift laterally into theother. This hooking action is of such a
relative to the attaching device.
'
snug character that theplate cannot be pulled out
My invention is illustrated in the drawings of
the attaching device by the tension used in
hereof and is hereinafter more fully explained
25 and the essential novel features are set out in the
claims.
’
In the drawings, Fig..~1 is a plan, intermediately "
broken away, of a'printing plate with my attach
ing devices on the two ends thereof; Fig. 2 is a‘
30 fragmentary view of the attaching device and an
end portion of the plate, showing the attaching
device as it is being mounted on the plate or re
.85
moved therefrom; Flg. 3 is a fragmentary cross
section on the line 3—3 on Fig. -1, showing the
attaching device and plate interlocked with each
other; Figs. 4 and 5 are crossésections of the
attaching device in different regions, as indi
cated by the lines 4—4 and 5—5, respectively in
Fig. 2; Fig. 6 is a longitudinal section through the
40 attaching device looking toward the doubled end
thereof; Fig. '7 is a‘ cross-section of‘a portion of
a planographic printing machine with a plate
' held by my attaching device ;- Fig. 8 is a view illus~
trating the connection of the attaching device to
48 the anchorage member on the drum, being a plan‘
looking in the direction indicated by the arrow
designated “8” on Fig. '7.
I
_
In Figs. 1, 2, 3, '7, and 8, “l0” indicates a print?
ing plate, which is a very thin sheet with its two.
50 ends doubled over onto the back of the plate, as
indicated at I l in Fig. 8 and in exaggerated form
anchoring the plate on the drum.
To effect the mounting to the ‘drum, the at- 2
_ taching device is formed to cooperate with a suit
able anchorage member on the drum. As shown,
I have formed the attaching device with itsv free
edge scalloped,_ as shown at 25,. and provided suit
able elongated openings 26 through the attaching
device at each of the ears formed by the scallop
ing. . These perforated ears are adapted to be
mounted in pockets in the anchorage device with
the openings occupied by suitable projections of
such anchorage device, after the manner of the
anchorage of the scalloped perforated plate set
out in Patent No. i,96'7,221, of Allen and Hartley.
Referring to Figs?l and 8 hereof, “indicates
a suitable drum on which the plate is shown as
mounted. This drum isprovided with a ?xed bar
3 I , having pockets and projections 32 over which
one of the attaching devices may be placed, and
with a movable bar 33 having corresponding
pockets 3! and projections 35 onwhich the other
attaching device may be'mounted. The bar 35 is
pivoted to the drum at 36 and carries screws 31
which at their ends abut a shoulderv 38 on the
drum. When the screws are turned in,‘ this forces
the anchorage device away from’ such "shoulder
and thus stretches the plate It about theE‘drum,
While my attaching means is suitable forL‘any
in Fig. 3, If this plate is of paper, a few-thou-
sort of a press employing a tl...1 plate, it may \
sandths of an inch thick, the folding of the end
stated for the sake of completeness that in Fig. 7'
will be quite abrupt, the folded over ply leaving
55 the main body of the sheet at a comparatively
40 indicates inking rollers ‘engaging the plate; 4!
a distributing roller engaging the inking rollers
2,116,468
2.
and 50 a roller carrying a transfer blanket in case
of offset lithography or acting as an impression
platen in direct printing.
'
The doubled over end ll of the plate In is in
While I do not confine myself to any speci?c
dimensions, it may be stated, by way of illustra
tion, ‘that I have obtained very satisfactory re-‘
sults by using a paper plate .010 inch thick, and
serted in thegrip of the attaching device by
being shoved laterally into place. The operator,
by ‘grasping the attaching device with one hand
and the edge of the plate with the other, may
insert the doubled end or the platev into the end
10
of the pocket provided by thedoubled portion of
the attaching device, and then, by a lateral shov
ing action or a pull on the other edge of the
plate, cause them to come into the mounted posi
tion shown in Fig. 4.
16
a metal strip .015 inch thick, and allowing a gap
between the central region of the doubled over
portion of the attaching device and the body of
.008 inch, with the gap adjacent the ends .012
inch.
v
poses. The plate is easily secured to the attach
ing device, and when secured is so ?rmly at
tached that the plate with the two devices may 15
be treated in use as one unitary" structure.
tates insertion of the device.
_ When the device is to be used with plates ofv
certain type of materials, I ?nd that a ?rmer grip
on the plate is desired. In such instances I make
the doubled-over portion of the attaching device
near the edges a very slight distance farther from I
the body of the attaching device than it is in the
main portion of its extent. This is illustrated in
Figs. 1, 2, 4,5 and 6. Theendmost regions of
30 the doubled-over portion indicated by the desig
nation “a” and by the cross-section Fig. 4, pro
vides a space sufiiciently greater than the thick
ness of the plate so that the ?anged edge of'the
plate may be very readily inserted. The inter
mediate region, indicated at “b” in Figs. 1 and?
and shown‘by the cross-section in ‘Fig. 5, has the
. doubled edge of the attaching device ‘slightly
closer to the plate, so that such intermediate re
gion engages the plate with such snugness that
considerable push or pull is required in mount-v
ing the ‘plate.
The result of the construction'just described
is that when the plate and attaching device have I
been mutually mounted, they are very- e?ectively"
held together, preventing any lateral shifting of
the plate ‘with reference to the attaching device,
as well aspreventing the attaching device being
' pulled from the plate even if an abnormal .force
is applied by the plate tensioner.
In my means for attaching the plate, the metal
strip is made vquite thin and the plate with its
two. attaching devicesareiadapted to be main-.._
tained in‘ the same machine alternatively with
the integral metal of plates of-the Allen and
Hartley patent mentioned.v When so mounted,
55 the attaching devices are within the‘ circumfer
are thus free from engagement with the inking
in,
stacked, one above the other, for storage pur
20 ‘be .010 inch thick, I find .011 inch spacing facili
rollers or the plate engaging roller 50.
‘
plateswith these devices attached to be readily
To enable the mounting of the attaching de
vice on the plate, I space the doubled-over por
tion of theattaehing device from the body of
the device a distance slightly greater than the
thickness of the plate. For instance, if the plate
ence of the drum,- as illustrated in Fig. 7, and
'
The thinness of my attaching devices enables
I claim:
,
v1. An attaching device for a printing plate
having a doubled-over end comprising a mem
20
ber having a body portion and a backwardly pro
jecting edge providing an elongated pocket into
which the doubled-over edge of the plate may
extend, the intermediate portion of. said pocket
having a narrower mouth than the extreme. por
tions.
'
’
_'
"
, 2. An attaching device for a printing plate
comprising a strip provided with openings and
an edge portion of the strip bent backwardly sub
stantially parallel with the body thereof, the
intermediate region of vthe edge portion being
closer to the body than the end regions thereof.
3. An attaching, device for a printing plate.”
having a doubled-over end, comprising a metal
strip having an?at major portion with perfora
tions and a minor doubled-over portion substan
tially parallel with the major portion, said dou
bled-overportion extending for substantially’
the width of the strip and'lying comparatively
close to it throughout its length but being slightly
farther away from the body of the strip for a 40
short distance adjacent the end of the doubled
over portion than it is throughout the interme
"diate region of the doubled~over portion.
..
4. vIn combination with a paper'printing-plate
having its end folded over abruptly and .a thin
metal-‘attaching device, having its end portions.
doubled over fora short distance on itself, by a
rounded partially tubular portion, so that the
printing plate and the attaching device may
hook into each other, the tubular portion form
ing a sti?ening means on that side of the device
‘ opposite the-.doubled-over portion and
don-
bled-over end' of the printing plate extending
into such tubular portion, whereby said print
-ing plate may be‘ readily slid into interlocking
engagement with the attaching device, even
though the extreme'end of the printing device he
frayed from use.
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HENRY c. osBoaN.
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