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Патент USA US2105452

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Jam“, 1938.
2,105,452
A. S. BUSK
PLATE CLAMP
Filed Dec. 18, 1935
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Jan. 11, 1938.
A. S. BUSK
Filed Dec. 18, 1935
2, 105,452
2 Sheets-Sheet 2
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.41 111??.
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INVENTOR.
BY‘ 6’ How/5 05K
ATTORNEY. _
‘
Patented Jan. 11, 1938
iJNi'i‘ED STATES FATEN'E GFFIQE
2,105,452
PLATE CLAMP
Anthony S. Busk, Paterson, N. J., assignor to
New Era Manufacturing Company, Paterson,
N. J., a corporation of New Jersey
Application December 18, 1935, Serial No. 54,997
20 Claims.
‘52'
10':
15?
2Q.
25
so.
My invention relates generally to plate-clamps?
for printing-press cylinders where it is desired to
have substantially the entire circumference of
the cylinder utilized for impression or platBsupporting purposes as is common in web printing-presses, and my invention particularly relates
to improved clamping mechanisms for fastening
?exible sheets or plates in even and firm contact
with the printing-press cylinder and is especially
adapted for securing the zinc plates Wrapped
about the cylinders in offset printing-presses,
though it may be used to advantage in other types
of presses.
The objects of my invention are, among other
things, to provide a simple, novel and efficient
clamp mechanism for such printing plates which
plate-clamps will be convenient to operate and
which will strain and hold the plate wrapped
about the cylinder surface with a uniform and
equalized tension so as to prevent any wrinkles
or unevenness on the surface of the plate, thereby
ensuring accurate printing; furthermore to provide a plate-clamp mechanism of such a char—
actor that permits substantially all the continuous
printing surface of the cylinder to be used, which
object I accomplish by utilizing the cylinder plate
clamping mechanism as part of the cylinder
printing surface when the plate has been positione'd and secured for printing.
‘
A further feature of my invention is the provisidn of an improved plate-clamp embodied
within the cylindrical contour of the cylinder and
having the desired attributes of simplicity, ei?ciency and durability, by which the flexible plate
35. may not only be clamped to the cylinder but also
loosened therefrom, both easily and quickly, with
the likelihood of mutilation of the plates reduced
to aminimum in that the operations of the clamping devices are conveniently located outside the
40.. Zone of the printing plate wrapped about the
cylinder.
With these and other objects in view, my invention comprises the construction, combination
and arrangement of the various parts hereinafter
45 described, and then particularly pointed out in
the appended claims.
.
-
In the accompanying drawings, Fig. 1 is a plan
view of the press cylinder, partly broken away
to show the structure of the plate-clamp, the
50- right portion of this ?gure showing a portion of
the ?exible plate wrapped about the cylinder
in clamped position;
Fig. 2 is a sectional view on the line 2--2 of
Fig- 1;
55v Fig. 3 is a. sectional view similar to Fig. 2, but
(01. 101-415.!)
showing the cylindrical segment withdrawn below
the peripheral surface of the cylinder when the
plate is to be loosened and removed;
Fig. 4 is a detailed end view looking from the
right of Fig. 1;
Fig. 5 is an enlarged detailed section showing
the plate ends held by the clamp with a practi
cally continuous printing surface for the cylinder;
and
Fig. 6 is a perspective View of the ?exible plate.
Similar numerals refer to similar parts
throughout the several ?gures.
Referring to the drawings and particularly to
Fig. l, the press cylinder 1 is of the usual hollow
construction having the peripheral cylindrical
side walls 8 with the bearers 9 and H] at either
end, the cylinder 1 being mounted'on the axially
disposed supporting shaft II to which is fastened
the driving gear 1 2. Integral with the cylinder
‘I and bearers 9 and m‘ is the irregular shaped
counter-sunk web l3 (Figs. 2 and 3), which ter
minates with the cylinder side walls 8 to form the
‘
54
10‘
15;
\
20
transverse edges l4 and I5 coincident with the
peripheral surface of the cylinder 1 with the
transverse gap or wide slot l? within which is 25
?tted the transverse cylindrical segment ll of
'
the same degree of curvature as the side Walls 8
of the cylinder 1, as shown in Figs. 1 and 2.
The cylindrical segment 11 carries lugs l8 at
either end journalled in the stud-bolts l9 that 30
are secured in holes 20 drilled in either end of the
cross-shaft 2|, the stud-bolts l9 being journalled
in the bearers 9 and ID as shown in Fig. 1. To
the outer ends of the stud-bolts l9 are keyed the
brackets 22 to which are pivoted the short rods 35
23 that are adapted to slide in the apertured
lugs 24 fastened to the bearers 9 and ID as shown
in Fig. l. Coiled about the rods 23 between the
lugs 24 and the inner base of the rods 23 (Figs.
l and 4) are the two compression springs 25 40
that normally hold the depending brackets 22 in
their radial position as shown in Fig. 4. The
outer surfaces of the brackets 22 and adjacent
ends of the stud-bolts l9 have holes 25 formed
therein for the insertion of any suitable pin-bar 45
or bolt 21 (shown in dot and dash lines in Fig. 4)
.
to rock the brackets 22' in an anti-clockwise direc
tion as shown by the arrow in Fig. 4 against the
tension of the springs 25.
The cylindrical segment I‘! is so shaped that its 50
outer surface 28 when the segment is raised to its
normal operative position (Fig. 2) snugly ?ts
within the transverse opening l6 and is a part of
the printing surface of the cylinder 1 extending
from the transverse edge 15. When the segment 55
2
2,105,452
I1 is lowered by pivoting on the cross-shaft 2|
to its Fig. 3 position, it no longer forms a part of
the printing surface between the transverse edges
I4 and I5 of the cylinder ‘I and no longer is in
contact with, nor does it serve as a support for,
the ?exible plate P shown as wrapped about the
cylinder ‘I (Figs. 2 and 3).
Means. for raising and lowering this segment
I‘! on its pivoted support on the cross-shaft 2%
10 may be widely varied: In the embodiment illus
trated in Figs. 1-4, I have shown a preferred
mechanism which effectively accomplishes this
purpose. Extending inwardly from the lugsv I8
of the segment I‘! are spaced apart webs in the
15 form of integral short arms 29 (four being shown
in dotted lines in Fig. l). Fastened to the outer
(and lower) ends of the arms 29 are four rounded
flat plates 39, preferably of hardened steel. Op
posite and in spaced parallelism with. the plates
20 38 are rounded flat buttons 3|, also preferably
made of hardened steel, that are welded or rigidly
secured to the body of the web 53. Extending
transversely through the cylinder ‘l and journalled
in the bearers 9 and ill is the cylindrical cross
25 shaft 32 arranged between the plates 35 and
buttons 3| with ?at cut-out portions 33 formed in
the cylindrical surface of the shaft 32 between
in the hole 35 and moves the bar 35 in the direc
tion of the arrow in Fig. 4, which movement 10
rocks the shaft 32 so that the cut-out portions
33 come into surface contact with ?at plates 30
so as to permit the segment I? to drop or swing
inwardly on the stud-bolts I9 as shown in Fig.
3 with outer surface of the segment I‘! below or 15
inside the periphery of the cylinder ‘I itself. The
stud-bolts I9 journalled in the cross-shaft 2| are
then moved by the pin-bar 2‘! to the left in Fig.
4 which swings the clamping plate 42 to the
right in Fig. 3 against the tension of the springs 20
25. Then the front bent-over end 45 of the plate
P is placed transversely between the cylinder
edge I4 and the clamping plate 42 which is then
allowed to pinch the plate end 45 against the
transverse edge I4 by the force of the released 25
springs 25. The cylinder ‘I is then rotated one
revolution so as to wrap the plate P about the
the oppositely disposed plates 30 and buttons 3i,
cylinder.
all as shown in Figs. 1-3.
opened again by moving same in a clockwise
direction in Fig. 3, and the rear end 46 of the 30
plate P is fitted over the top of the clampingv
Pinned to the end of
30 the shaft 32 adjacent the bearer I?! is the circular
boss 34 having the hole 35 cut in its outer surface
for the insertion of a pin-bar 36 (shown in dot
and dash lines in Fig. 4) in order to shift the
boss 34 and so rock the shaft 32 in either direc
tion.
Thereafter the clamping plate 42 is
plate 42 (Figs. 3 and 5) and adjacent the front
end 45 so that the clamping plate 42 holds both
plate ends 45 and 45 in surface-to-surface con
tact with the transverse edge 44.
The boss 34 has formed therein the elongated
concentric slot 31 through which projects the
threaded bolt 38 having the squared head 39
by which the position of the cross-shaft 33 and
boss 34 may be rigidly secured in any predeter
mined position within the slot 3?. Fig. 2 shows
the plates 30 and buttons 3| braced apart to
hold the segment I‘! in its raised position coinci~
dent with the sidewalls 8 of the cylinder ‘I, while
Fig.
3 showsthe cut-out portions 33 of the shaft
45
32 in surface—to-surface contact with the ?at
plates 3|] to permit the segment IT to swing in
co
angled bent-over ends 45 and 46 to a depth of
about 1A, inch. The distance between the bent
edges 45 and 46 of the plate P is equal to the
circumference of the cylinder ‘s’ less twice the
thickness of the plate P as shown in Figs. 2, 3,
and 5.
In operation in fastening the plate P to the
cylinder ‘I, the presman inserts the pin-bar 35
Then by means
of the pin bar 36, the'pressman turns the shaft
32 until the full diameter of the shaft is wedged
between the plates 30 and buttons 3| thereby
raising the segment I‘! to its Fig. 2 position with
the periphery of this segment forming a part of 40
the true periphery of the cylinder ‘I’ (Fig. 2).
This raising of the segment I‘! to the position
shown in Figs. 2 and 5 strains and holds tight
the plate P wrapped about the cylinder ‘I to
bring the plate in accurate position for printing. 45
The pressman then locks the segment I‘! in its
normal position to hold the plate by screwing
wardly on the shaft 2| below the cylinder sur
face, and so out of contact with the plate P.
The plate-clamping mechanism proper com
prises the cross-shaft 2| that rocks in either di
home the threaded bolt 38 by means of a wrench
acting on the squared head 39 to prevent any
rection (Fig. l), the under part 45) of the cross
shaft bearing on a ?at elongated plate 4|, pref
erably of hardened steel. which is secured trans
versely across the cylinder below the transverse
edge I4. As shown in Figs. 2 and 3 the shaft 2|
has a limited rocking movement with its under
part 48 bearing on the plate 4|. Projecting up
wardly from, and integral with, the shaft 2| is
the clamping plate 42 with its upper end having
a recessed portion 43 (Fig. 5) and its top or ex
cylinder ‘1, the operations are substantially the
posed surface lying in parallelism with the trans
verse edge |4 in the small opening between the
rotary movement of the shaft 32.
To loosen and remove the plate P from the
same but in a reverse order, and need not be
described in detail except that should the seg
ment I‘! fail to drop from its Fig. 2 position
when the shaft 32 is rotated to its Fig. 3 position,
a slight movement of the clamping plate 42 in a
clockwise position in Fig. 3 will lower the seg4
ment I‘! and so release the tension on the plate
P so that its bent-over ends 45 and 45 may be 60
sequentially detached from their mutual sur
face contact in the narrow opening between the
transverse edge I4 and adjacent recessed portion
edge I4 and the adjacent edge 44 of the segment
I‘! and coincident ‘with the cylindrical surfaces
43 of the clamping plate 42. (Figs. 2, 3, and 5.)
of the cylinder ‘i and segment I‘I.
the segment I‘! together with the top surface of
the clamping plate 42 as part of the cylinder
'
When the stud-bolts I9 are rocked by the
brackets 22 against the tension of the springs 25,
the clamping plate 42 on the shaft 2i has a lim
ited' rocking movement between the transverse
edge I4 and the segment IT with the under part
4|! bearing on the plate 4| (Fig. 1).
The plate P is shown in Fig. 6 and is the
customary ?exible plate of zinc for use in offset
printing. Each end of the plate P has right
According to my invention I have employed 65
printing surface as well as an element in the
clamping mechanism so as to permit the use for
printing of practically the entire circumferential
printing surface of the cylinder ‘I as clearly
shown in Fig, 5.
My invention is not to be restricted to the
precise details of construction shown, since var
ious changes and modi?cations may be made
3
2,105,452
therein without departing from the scope of the
invention or sacri?cingthe advantages derived
from: its use.
I claim as my invention:
1. In a printing cylinder having a gap and
having a ?exible plate‘wrapped about the cylin
der with both bent-over ends of the plate ar
ranged in mutual parallelism within the gap ad
jacent one of the edges of the gap, a clamping
member, and means for yieldingly moving said
member angularly with respect to the cylinder
to grip both bent-over ends of the plate against
said edge.
2. A printing cylinder having a gap, a clamp
15 ing member within the gap to grip both ends of
a ?exible plate wrapped about the cylinder, and
spring-pressed means for holding said member
against the plate ends to press the latter against
one of the edges of the gap.
20
3. A printing cylinder having a gap, a clamping
member within the gap to grip both ends of a
?exible plate wrapped about the cylinder, spring
pressed means for holding said member against
the plate ends to press the latter against one of
25 the edges of the gap, and a plate-supporting seg
ment movable outwardly within the gap for ten
sioning the plate on the cylinder.
4. A printing cylinder having a gap, a clamping
member within the gap to grip both ends of a
30 ?exible plate wrapped about the cylinder, spring~
pressed means for holding said member against
spring-pressed means normally forcing said
clamping plate against the bent-over ends of a
?exible plate wrapped about the cylinder to grip
and hold the ends against said edge, a plate C11
supporting segment pivoted within the gap to
form a part of the cylinder surface, means for
raising and lowering said segment without mov
ing the clamping plate to tension and loosen the
plate on said cylinder, and means for locking said 10
last means in either position.
9. A plate-clamp for holding a ?exible plate
having right-angled bent-over ends and wrapped
about a printing cylinder having a gap comprising
a spring-pressed clamping member to grip and
hold the plate ends interposed between the mem
ber and one of the edges of the gap, and a plate
supporting segment movable within the gap to
tension the plate on the cylinder and form a part
of the cylinder surface, one edge of the segment
bearing on the clamping member opposite to the
plate ends to look the plate under tension on the
cylinder.
10. A plate-clamp for holding a ?exible plate
having right-angled bent-over ends and wrapped
about a printing cylinder having a gap compris
ing a spring-pressed clamping member to grip
and hold the plate ends interposed between the
member and one of the edges of the gap, and a
plate-supporting segment adjacent said clamping 3
member and movable within the gap to tension
the plate on the cyilnder and form a part of the
the plate ends to press the latter against one of
the edges of the gap, and a plate-supporting seg
ment movable outwardly within the gap to bring
the segment surface coincident with the cylinder
cylinder surface, one edge of the segment bearing
on the clamping member opposite to the plate
surface for tensioning the plate on the cylinder.
inder.
5. A printing cylinder having a gap, a clamp
ing member within the gap to grip both ends of a
?exible plate wrapped about the cylinder, spring
40 pressed means for holding said member against
the plate‘ ends to press the latter against one of
the edges of the gap, and. a plate-supporting seg
ment adjacent said clamping member and mov
able outwardly within the gap for tensioning the
plate on the cylinder, while forcing the clamping
member against the plate ends to lock the plate
on the cylinder in printing position.
6. A printing cylinder-having a gap, a longi
tudinally-disposed clamping plate within the gap
50 in parallelism with oneof the edges of the gap,
spring-pressed means normally forcing said
clamping plate against the bent-over ends of a
?exible plate wrapped about the cylinder to grip
and hold the ends against said edge, a plate
CY OX supporting segment pivoted within the gap to
form a part of the cylinder surface, and means for
raising and lowering said segment without mov
ing the clamping plate to tension and loosen the
plate on said cylinder.
60
in' parallelism with one of the edges of the gap,
7. A printing cylinder having a gap, a longi
tudinally-disposed clamping plate within the gap
in parallelism with one of the edges of the gap,
spring-pressed means normally forcing said
clamping plate against the bent-over ends of a
?exible plate wrapped about the cylinder to grip
and hold the ends against said edge, a plate-sup
porting segment pivoted within the gap to form
apart of the cylinder surface, and means for
raising said segment coincident with the periph
cry of the cylinder to tension and for lowering
said segment out of contact with the plate to
loosen the latter without moving the clamping
plate.
8. A printing cylinder having a gap, a longitu
75 dinally-disposed clamping plate within the gap
ends to lock the plate under tension on the cyl- '
'
11. A plate-clamp for holding a ?exible plate
having right~angled bent-over ends and wrapped
about a printing cylinder having a gap compris
ing a spring-pressed clamping member to grip
and hold the plate ends interposed between the
member and one of the edges of the gap, a plate
supporting segment pivoted within the gap adja
cent said clamping member to form a part of the
cylinder surface when forced into contact with
the plate adjacent one of the plate ends, and
means for raising said segment with one edge
thereof bearing on the clamping member to lock
the plate under tension on the cylinder, the sur
face of the segment in its raised position being '
coincident with the periphery of‘ the cylinder.
12. In a printing cylinder having a gap and
having a ?exible plate wrapped about the cyl
inder with both bent-over ends arranged in
mutual parallelism within the gap adjacent one of
its edges, a single clamping member pivotally
mounted within the gap, and means for yieldingly
forcing said member to rock angularly with re
spect to the cylinder to grip both bent-over ends
of the plate against said edge, the top surface of
said clamping member forming a part of the
supporting surface for the plate on the cylinder.
13. A plate-clamp for positioning a ?exible
plate wrapped about a printing cylinder having
a gap comprising a single pivotally mounted
clamping member, means for moving said mem
ber angularly within the gap to ?rst lock both
bent-over ends of the plate in surface-to-surface
contact against one edge of the gap, a plate
supporting segment adjacent the clamping mem
ber, and means for thereafter moving said seg
ment outwardly within the gap substantially to
the periphery of the cylinder to tension the plate
on the cylinder, the top surfaces of the clamping
member, said segment and the cylinder support
2,105,452
ing substantially the entire under surface of the
moving said member transversely within the gap
plate.
to ?rst lock both bent-over ends of a ?exible
plate in surface-to-surface contact against one
edge of said gap, a plate supporting segment,
means for thereafter moving said segment out
wardly within the gap substantially to the pe
14. A plate-clamp for positioning a ?exible
plate wrapped about a printing cylinder having a
gap comprising a single longitudinally disposed
pivotally mounted clamping member, means for
moving said member transversely within the gap
to ?rst lock both bent-over ends of the plate
in surface-to-surface contact against one edge
10 of the gap, a plate supporting segment adjacent
the clamping member, and means for thereafter
riphery of the cylinder for tensioning the plate,
the top surfaces of the clamping member, said
segment and the, cylinder supporting substan
10
tially the entire under surface of the plate. 1
18. A printing cylinder having a gap, a single
under surface of the plate.
15. A plate-clamp for positioning a ?exible
plate wrapped about a printing cylinder having
pivotally mounted clamping member, means for
moving said member angularly within the gap
to ?rst lock both bent-over ends of a ?exible
plate in surface-to-surface contact against one 15
edge of said gap, a plate supporting segment,
and means for thereafter moving said segment
outwardly within the gap substantially to the pe
riphery of the cylinder for tensioning the plate,
a gap comprising a single pivotally mounted
the top surfaces of said clamping member and
moving said segment outwardly within the gap
substantially to the periphery of the cylinder to
tension the plate on the cylinder, the top sur—
faces of the clamping member, said segment and
the cylinder supporting substantially the entire
clamping member, means. for moving said mem
of said segment being adjacently coincident with
ber angularly Within the gap to ?rst lock both
bent-over ends of the plate in surface-to-surface
contact in mutual parallelism against one edge
of the gap, a movable plate-supporting segment
the periphery of the cylinder.
within the gap to tension the plate on the cylin
der, and means for thereafter moving said seg
ment outwardly and substantially to the periph
ery of the cylinder, the top surfaces of the clamp
ing member and the segment forming a substan
tially continuous part of the cylinder surface.
16. A plate-clamp for positioning a ?exible
plate wrapped about a printing cylinder having
a gap comprising a single pivotally mounted
clamping member, means for moving said mem
ber angularly within the gap to ?rst lock both
bent-over ends of the plate in surface-to-surface
contact in mutual parallelism against one edge
of the gap, a movable plate-supporting segment
within the gap to tension the plate on the cyl
inder, and means for thereafter moving said
segment outwardly andsubstantially to the pe
riphery of the cylinder, the top surfaces of the
clamping member and the segment forming a
substantially continuous part of the cylinder sur
face, and means for withdrawing the segment
19. A printing cylinder having a gap, a single
pivotally mounted clamping member, means for
moving said member transversely within the gap
to ?rst lock both bent-over ends of a ?exible
plate in surface-to-surface contact against one
edge of said gap, a plate supporting segment, and
means for thereafter moving said segment out
wardly within the gap substantially to the pe 30,
riphery of the cylinder for tensioning the plate
independently of the clamping member and with
out moving the latter, the top surfaces of the
clamping member, said segment and the cylinder
supporting substantially the entire under sur
face of the plate.
20. A printing cylinder having a gap, a single
pivotally mounted clamping member angularly
within the gap to ?rst lock both bent-over ends
of a ?exible plate in surface-to-surface contact
against one edge of said gap, a plate supporting
segment, and means for thereafter moving said
segment outwardly within the gap substantially
to the periphery of the cylinder for tensioning
the plate independently of the clamping member 45
and without moving the latter, the top surfaces
within the cylinder gap to loosen the plate on the
of said clamping member and of said segment
cylinder without moving the clamping member
from its locked position.
being adjacently coincident with the periphery
of the cylinder.
17. A printing cylinder having a gap, at single
pivotally mounted clamping member, means for
ANTHONY S. BUSK.
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