Year: 1896

page_text: be particularly described and ascertained in and by the following statement :-
Referring to the accompanying drawings:-
Figure 1 is a plan, and
Figure 2 a side elevation of one form of my invention.
Figure 3 is a view showing more plainly the preferrel arrangement of devices
for actuating the wipers and
Figure 4 is a detail view showing a portion of the offset cylinler aud
wiper-bar.
In the drawings, A. A' Figure 2 are the printing cylinders and B B' impression
cylinders. These cylinders are mounted in any suitable manner in an appropriate
frame, such as D, for instance, and are rotated simultaneously at the same speed
by any suitable means, such, for example, as the gear-wheel E which meshes with
gears on cylinders B and A' respectively, as well as with a gear ou
cylinder F which is one member of the offset mechanism, and is also journalled in
frame D see Figure 1. The mounting and driving of all these parts will be
readily understood by all skilled in the art without particular description, except
that in my invention the offset mechanisms and consequently the cylinder F which
forms part thereof is intermediate the cylinders A B and B' A', the functions
of which are expressed hereinbefore.
The paper, G, is shown as passing between cylinders A B, whereby the paper is
printed on its surface g; thence between the cylinders B' A whereby it is printed
on its surface gl. As the construction, functions and arrangements of cylinders A B
and B' A', are old and well known, and the printing of surfaces g g' of the paper
fed between them, is also old and well understood, no particular description is
Decessary to a full understanding of the same by all skilled in the art. Heretofore
various mechanisms and methods have been employed for preventing, or at least,
minimizing the offset (of the ink from one printed side of the paper upon a
eubsequently utilized impression cylinder) but most of these offset mechanisms have
fallen short of success and been attended with various objections from an economical
standpoint. In carrying out my plan of preventing the objectionable offset, a pair
of cylinders F F are interposed between the sets of printing and impression
oylinders A B, A' B' and the paper is fed from one of these sets to another, all the
cylinders A B, A' B' and FF having the same surface speed whereby the proper
feed of the paper is not in any wise impeded. Cylinder F has a hard surface
(preferably) and the surface f Figure 2 of cylinder is a jacket or cover of a
suitably absorbent or semi-absorbent material so as to take up the surplus ink on
printed surface g of the paper G. Cylinder F, as shown, is driven by gears fand f
and the paper G is so tightly nipped between the cylinders F F that not only is
the superfinity of ink largely removed from printed surface g, sufficiently so to
prevent, or at least, minimize the offset on the next impression cylinder B', but the

page_text: paper passing between cylinders FF on its way to the next set, A'B', is
approximately "calendere," the impression on the surface g' of the paper G being
largely obliterated and the ink type-forms or printing being nicely laid " on the
printed surface g, as will be plain upon consideration of the fact that paper G is
printed on surface g, while passing between rolls A and B; is then passed
between the cylinders F F¹; aud is then passed between the cylinders B' A'
to be printed on its reverse surface g'. The work-surface f¹ of semi-absorbent
or absorbeut material is held in place by reel-rods f mounted, in a recess
in cylinder F see Figures 2 and 4 and extending lengthwise of the cylinder,
one end of surface being fast upon rod f, and passing thence outwardly
from recess and about the cylinder F to the other rod f. The space fo
between the corners of the recess and covering surface, generally
corresponds to marginal portions of the paper G, so that offset surface is
effectual for the whole of the printed surface 9 coming from cylinders A, B. The
absorbing surface takes up more or less of the superfluous ink on the printed
portion of surface 9 and prevents the "smutching" of that portion when the
opposite portion of the paper receives impression from cylinder A. Wipers are
employed to clean the surface, consisting, preferably, of reciprocating wiping
bars 1 Figures 1 to 4 provided with felt or the like at h Figure 4 and extending
and reciprocating endwise of qylinder F in contact with the work-surface
(consisting of manilla paper, for example) which is, however, removable, as will be
readily understood from its detachable connection with cylinder at ff. The
wiping-bars H, in the construction illustrated, are connected with arms of a
rocker-shaft, Figures 1, 2 and 3 which has a bearing as at ', on frame D, and
a cam roll-supporting arm /, provided with a cam roll Figures 1 and 2 that
engages and works with a cam-surface on the end of cylinder F. By this
arrangement, the wiping bars H are alternately reciprocated against and lengthwise
of the offset cylinder F, as the arm is moved outwardly, by the cam surface h
and inwardly by the cam surface h' that tends to keep the cam-roll in continual
contact with the cam-surface A°. An offset cloth or wiper-web I Figures 2 and 3
passes from a reel i over each wiping bar H having a padded face I.to a reel i
reels i being arranged in paire, corresponding to each wiper bar employed, and
mounted in any suitable manner, conveniently on frame D, for instance. One or
more sets of reels i' and see Figure 2 extend lengthwise the wiper-bars and
offeet cylinder, and are provided with ratchets and pawl carrying-arms, cach
provided with a pawl. The pawl carrying-arms of each set of reels ii', are each
attached to a rod from a rocker-arın pivoted to frame D and actuated by a
cam Figure 8 each connecting-rod being pivoted to one and the same end of a
rocker-arm, and but one pawl and ratchet of a set being in engagement at the
same time. Consequently each offset cloth or wiper web I is moved intermittently
over its reciprocating wiper-bar, being wound from one real to its mate, and, by
throwing the first operating pawl out of engagement and the other pawl into
working position, the wiper-cloth so intermittently fed from one reel i of a set to
its mate i, is rewound from reel to its mate i, but intermittently, so that the
wiper-cloth is not only reciprocated over the work surface of the offsut cylinder F
from end to end thereof, but is also intermittently moved over the wiper-bar to
present clean or approximately clean surfaces for wiping ink from the work
surlace. One wiper cloth is best a clean cloth and the other an oiled cloth,
that wiper-cloth I nearer the first acting cylinders A and B usually being the oiled
cloth, the oil fron the cloth acting upon the offset ink to soften it so that the next
wiper-cloth the more readily and thoroughly cleanses the offset surface or
sheet which is removable so as to be replaced by a fresh sheet from time to
time.
The work-surface f' of the offset cylinder may be compared to a "blotter" and
this cylinder termed a blotter cylinder; aud the function of the wiping mechanism
is to clean the work-surface of the eyliudor which, but for the wiping mechanism
of some construction, would speedily become smeared with ink from the freshly
printed surface g.

page_text: It will be plain that my invention may and must be embodied in many different
forms to accommodate it to printing presses differing in construction.
Having now particularly described and ascertained the nature of my said in ven--
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I olaim is :-
First. In a printing-press, the combination of a pair of printing and impression
cylinders with a pair of intermediate offset cylinders; one of said cylinders being
a removable offset; a shifting wiper web contacting with said sheet; means for
rotating all said cylinders in the same direction at the same surface speed to feed
and print; aud means for shifting the wiper-web; one of the offset cylinders
being recessed and therein provided with means for securing the removable.
ink-absorbing sheet in working position, all substantially as and for the purpose.
set forth.
Second. In a printing press, the combination of a plurality of pairs of printing
and impression cylinders with an offset mechanism, comprising a pair of cylinders,
one of which has an ink-absorbing surface, all the cylinders having the same
surface speed; and a movable wiper-bar and shifting wiper web, substantially as
described.
Third. In a printing press, the combination of an offset cylinder with a pair of
end wise moving wiper-bars and a shifting-web for each bar, one of the webs being
an oiled cloth, and the other a plain cloth, substantially as and for the purpose set.
forth.
Dated this 1st day of September 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant..