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Патент USA US3083654

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April 2, 1963
Filed July 28, 1961
:s Sheets-Sheet 1
A ttorn eys
April 2, 1963
Filed July 28, 1961
:5 Sheets-Sheet 2
A Home y:
AP ' 2, 1963
Filed July 28, 1961
3 Sheets-Sheet 3
Jémuz/ é. TOW/z)
United States Patent 0 ”
Thomas E. Phythian, Headingley, Leeds, England, as
signor to R. W. Crabtree dz Sous Limited
Fiied July 28, 1961, Ser. No. 127,518
Claims priority, application Great Britain Aug. 8, 1960
10 Claims. (Cl. 1ti1—378)
This invention relates to mechanism for securing the
usual stereotype printing plates to the printing cylinders
of rotary printing machines. More particularly, the in
Patented Apr. 2, ‘i963
to be plated with two or more plates around the cylinder,
each of such plates could have a clamp-operating mecha
nism according to this invention for the hooks at its two
straight edges, each being independently operated. Simi
larly, where the cylinder is required to be plated with
two or more plates along the cylinder, the hooks for the
various plates could be independently operated by mecha
nism in accordance with this invention, or operated to
gether from a single operating member.
The invention is illustrated in the accompanying draw
ings, in which FIGURE 1 is a local plan of the mecha
nism for operating four hooks to tension a plate circum
ferentially, FIGURE 2 is a local section on the line
vention is concerned with such mechanism commonly
II—-II of FIGURE 1, and FIGURE 3 a local section on
known as “tension lock-up” mechanism, by which metal
of the plate is subjected to a tensional loading instead of 15 the line IH—III FIGURE 1; FIGURE 4 is a sectional
plan view of a slightly modi?ed arrangement for operat
a compressional loading as occurs in the older, more
ing two sets of four hooks, which are arranged alongside
usual, method of securing such plates.
one another to tension circumferentially two plates laid
In the case of a tension lock-up, the under surface of
side by side on a printing cylinder and the various hooks
the printing plate is formed near each of its curved end
being operable by va common actuating component; FIG
edges, its straight end edges or (in some cases) near both
sets of edges, with a set of undercut recesses: the clamp
ing ‘mechanism comprises sets of hooks (one set for each
set of recesses), and the mechanism includes some means
or other to move the sets of hooks relatively towards one
URE 5 is a section taken on the line 11-41 FIGURE 1,
and FIGURE 6 an end elevation.
Referring, ?rstly, to FIGURES l—3 of the drawings,
the hooks of each of the two pairs are indicated at 1, 2,
these hooks each being carried by and mounted to turn
another to enable the plates to be placed in position over 25
on a ?xed spindle 3, mounted in blocks 3% in a recess
formed in the printing cylinder It, the hooks being formed
the plate by a force which tensions the metal of the plate
to engage in recesses cut in a printing plate adjacent one
between the opposed sets of hooks.
of its longitudinal edges. The hubs of the hooks are
Due to the nature of the stereotype metal, it is very
the hooks and then relatively apart so as to hold down
important that the tension loading of the plate by the hooks
shall be more or less uniformly distributed over the plate
so as to avoid the setting up of intensi?ed local stresses:
?tted with pinions 7, respectively engaged by teeth 8 on
curved rack bars 3a one for each pair of hooks and hav
tolerances or inaccuracies in the formation of the recesses
ing other rack teeth 9.
The sets of rack teeth 9 for operating the two pairs of
hooks 1, 2 are respectively in mesh with a ?oating pinion
an improved mechanism which will accommodate itself
to any irregularities in the formation of the recesses in
two hooks 1, 2 of each pair: the studs 11 are carried at
one end of ?oating lever member 12: this lever is pivotally
such a condition could arise, for example, by the inevitable
16 mounted on a stud 11, each individual pinion member
in the plate.
35 10 forming in effect a ?oating lever interconnecting the
It is the main object of the present invention to provide
the plate in such a manner as to ensure the automatic
mounted on a stud 13 between the studs 11 for the two
According to the present invention, the various hooks
of the hooks for the leading (or trailing) end of the
plate, this support 14 would usually be ?xed to the cylin
der: in the case of the other end of the plate, the support
distribution of the applied operating force more or less 40 pinions ill.
This stud i3 is mounted on a support 14: in the case
uniformly over the extent of the plate.
of a set are mounted for individual movement into plate
engaging positions and the various hooks of a set are
placed into cooperation with a common operating com 45 would, as is shown in the drawings, be curved about the
cylinder 4 and movable circumferentially to cause the
ponent or reaction component through ?oating members
which ?oat to balance the pressures exerted by the various
hooks of the set against one another so as thereby to
various hooks to tension the plate. For this purpose, the
support 14 is formed with rack teeth 15 engaging a pinion
16 mounted to turn on a stud l6a secured to the cylinder:
distribute the operating or the reaction pressure uniform
this pinion is fast with a pinion 17 in mesh with a rack 3L7a
ly among the hooks and hence over the metal of the plate.
on a bar 18 slidable longitudinally of the cylinder 4. This
As is usual, a set of hooks would be provided for each
bar is is arranged to be slidably displaced longitudinaliy
end of the plate displaced apart circumferentially of the
on the cylinder 4 by an axially displaceable end ring 19
cylinder; however, the sets could be spaced apart longi
which operates to move the bar 18 in the plate tensioning
tudinally; a combination of sets of hooks could be pro
vided where it is required to hold down the plate by both 55 direction through a compression spring 20: this causes
(through the rack 17a, the pinions 17 and 16 and the rack
circumferential and longitudinal tensions.
15) the support 14 to be moved circumferentially of the
The ?oating members can take various forms but, in
cylinder so as to effect the operation of the pairs of
general, a member would be provided for each pair of
hooks 1, 2 as has been described.
hooks of a set so as to balance the pressure between that
The mechanism is accommodated in a recess formed in
pair and those ?oating members can be carried by an
60 the periphery of the cylinder 4, the recess being closed by
other or other ?oating members which balance the pressure
a cover plate 21 having openings through which the outer
between the di?‘erent pairs, the ?nal ?oating member re
ends of the hooks pass and the ?oating lever 12 and the
acting against a common operatingr or reaction component.
support 14- being supported on arcuately faced blocks 22.
It will be apparent that the hooks are moved positively
Referring now to FIGURES 4—6 of the drawings, these
and do not, by reason of the balanced pressure reaction
between hooks, require any springs permitting the hooks 65 show a mechanism operating in a similar manner to that
described, these drawings, however, showing two complete
to accommodate themselves to one another. it may be
‘sets of four hooks, 1, 2-1, 2 for tensioning circumferen
desirable to cause the hooks to exert a “live” clamping ac
tially two plates P side-by-side, the arrangement being
tion on the plates, in which case it would be suiiicient to
duplicated, as shown in FIGURE 5, for each circumfer
operate through a spring which is compressed while the 70 ential half of the cylinder.
mechanism is operated to secure the plates.
For ease of comparing the two arrangements, the parts
Where, as is commonly the case, the cylinder is required
of the two constructions which correspond are given the
same reference numerals.
In place of the pinions 1%
coupling the rack bars 8a the rack bars are recessed at
their ends at 23 to embrace heads 24 of lever components
or members which are pivotally carried between their
ends by pivot pins 26 at the opposite ends of the ?oating
lever 12.
It will be clear that, in both arrangements, actuation
of the actuating member 19 in the one direction will cause
the two supports '14 to move circumferentially about the
cylinder 4 carrying with ‘them the ?oating levers 12 and
means to said hooks and including a ?oating member
connected to said operating means to move both bodily
therewith and relatively thereto, and means connecting
said ?oating member respectively to said hooks.
2. Mechanism according to claim 1 in which said ?oat
ing member is pivotally connected to said operating means.
3. Mechanism according to claim 1 in which the pivotal
connection of said ?oating member to said operating
means is between the connections of said ?oating member
to the respective hooks.
the bars 8HL ‘thus moving the hooks 1, 2 into the grooves
4-. Mechanism according to claim 3 in which said ?oat
in the plate: as the individual hooks engage the end walls
ing member is a pinion pivotally connected to said operat
of the grooves they will (by the continued actuation of the
ing means and in which the means connecting said ?oating
actuating member 19) build up the force exerted on the
member to said hooks comprises racks connected respec
plates but if the reaction experienced by any one of each 15 tively to said hooks and meshing with said pinion on '
opposite sides or" the pivotal axis thereof.
set of four books differs from that of ‘he others, the
?oating member's (i.e. the parts 12 and the pinions :19 or
5. Mechanism according to claim 3 in which said ?oat~
the components 24) will rock on their pivotal centres so as
ing member comprises a lever pivoted between its ends to
to equalize the forces exerted by all four hooks thereby
said operating means, the ends of ‘said lever ‘being con
achieving a uniform pressure distribution over the width
nected respectively to said hooks.
of the plates.
6. Mechanism according to claim 1 in which said means
common to both sets of hooks 1, 1 and 2, 2 in that it trans
connecting said ?oating member respectively to said hooks
comprises, for each hook, a pinion connected to said hook
to rock therewith; a rack in mesh with said pinion; and
means connecting said rack to said ?oating member.
7. Mechanism according to claim 1 including a spring
operatively connected to said single operating means for
mits operating force to both sets.
transmitting operating force to the latter.
The support 14 serves as a common means for operat
ing the two sets of hooks 1, 1 and 2, 2 through the inter
mediary of the ?oating member 12, which is ?oatingly
connected to the support 12 to move both bodily there
with and relatively thereto. The ?oating member 12. is
Similarly, the member
12 acts as a single operating means for transmitting force
to the hooks of each set through the intermediary of the
individual pinions 1t} and racks 9 in FIGURES l-3, 5 and
6, and through the individual components 24-, and rack
bars 88' in FIGURE 4.
8. Mechanism for securing a printing plate to a rotat
able printing cylinder, said mechanism comprising two
spaced sets of hooks, each of said sets comprising two
spaced hooks; a common operating ‘means for both said
sets; a common ?oating member connected to said common
The description, so far, given deals mainly with apply
operating means to move both bodily therewith and rela
ing the tensional securing force to the hooks for one edge
tively there-to; and separate means respectively connecting
of a plate: for the other edge a similar arrangement of
?oating members 12, 10 or 12, 24‘- could be employed but
said common ?oating member to said sets, each of said
separate means comprising an individual ?oating'member
in such a case the part 14 would be secured against move
connected to said common ?oating member to move both
ment: however, having regard to the accommodation for
bodily therewith and relatively thereto, and means connect
plate irregularities which is given by arrangement described
ing said individual ?oating member to the hooks of said set.
for the one edge the other edge of the plate can be held 40
9. Mechanism according to claim 8 in which said
merely by vhooks 27 which are as is shown in FIGURE 5
of “the accompanying drawings.
As is shown'in FlGUREo, the actuating member}?
can be in the form of a half ring ‘( two such half rings being
shown for the plates P on the two halves of the cylinder
common ?oating member comprises a lever pivoted be
tween its ends to said common operating means, the ends
of said lever being connected respectively to said separate
connecting means.
74-, each half ring being movable endwise on pins 29 by
10. ‘Mechanism according to claim 8 including a spring
operatively connected to said common operating means
a component 23 of any known type such as an eccentric).
for transmitting operating force thereto.
What I claim is:
References Cited in the ?le of this patent
1'. Mechanism for securing a printing plate to a rotat
able printing cylinder, said rneehanism comprising two 50
hooks engageable with the printing plate; a’ single operat
Worthington et al _______ __ Oct. 28, 1958
ing means; and means ?oatingly connectingsaid operating
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