Improvements in or connected with Cylinder Printing Machines.
Year: 1891

page_text: Date of Application, 5th Aug., 1891
Complete Specification Left, 19th Aug., 1891-Accepted, 10th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in or connected with Cylinder Printing Machines.
1, SIEGMUND ORBACH, of Königinhof, Province of Bohemia, in the Empire
of Austria, Book-keeper, do hereby declare the nature of this invention to be as
follows:-
My improvements in cylinder printing machines and in the working of the same
enable the backing sheets provided heretofore in such machines to be dispensed
with but they can also be applied with advantage to machines in which such backing
sheets are used.
The invention comprises an arrangement by means of which the printing colors
adhering to the blanket (an endless felt or rubber cloth upon which the pressing
cylinder bears for the purpose of increasing the elasticity of the printing surface)
are prevented from being carried away with same into the drying-room and there
solidifying on the surface of the blanket by this means the latter is protected even
when the machine works without any backing sheet, or without any lateral backing
bands intended for preventing to a certain extent the colors from being deposited
on the blanket. In cylinder printing machines as heretofore usually constructed,
it has.been.necessary even when a backing sheet was employed, to thoroughly clean
the blanket after a short space of time and free it from the dried color sticking
to it, this cleaning causing it to be rapidly worn out. By the present invention
this objection is overcome or obviated by conveying the blanket, before its passage
into the drying room, through washing. apparatus as hereinafter described, so that
the blanket does not enter the drying-room until it has been freed. from all the
color adhering to it.

page_text: In the rear of the water jets is arranged a doctor r (made of glass or of hardened
rubber) which presses out of the blanket the water previously absorbed by it; the
latter therefore dries rapidly when it enters the drying room.
As substitutes for the doctor illustrated in Figs. 1 and 2, two doctors vi
(Fig. 4) may be employed placed one behind the other, mounted so as to be able
to move round a pivot or fulcrum and pressed against the blanket by means of
weights to which they are connected by ropes passing on grooved pulleys.
The table a is arranged in a slanting position, in order to allow the water and the
dissolved color to run down towards the lowermost roller e. A corresponding slope
is given to the brushes g, to their crank-shaft h h, and to the side checks 1, in order
that the brushes may press equally on all parts of the blanket c.
Beneath the table is arranged a sheet iron screen w, provided with a discharge
pipe, and, in order that the water, together with the color brushed off the blanket,
may reach the said pipe, one part or face of the roller e is made of larger diameter
than the rest either by bending or by reinforcing it, or it has a certain pitch
relatively to the discharge-pipe of the screen w.
Another sheet iron screen 2, arranged above the washing apparatus, has for its
object to prevent water drops coming from the sprinkling tubes from being thrown
on the printed fabric which travels overhead towards the drying room.
Doted this 5th dor of A1001
S. ORBACH,
By L. W., per F. B.
COMPLETE SPECIFICATION.
Improvements in or connected with Cylinder Printing Machines.
I, SIEGMUND ORBACH, of Königinhof, Province of Bohemia, in the Empire of
Austria, Book-keeper, do hereby declare the nature of this invention and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement :-
My improvements in or connected with cylinder printing machines and in the
working of the same, enable the backing sheets heretofore provided in such
machines to be dispensed with, though such improvements can also be applied with
advantage to machines in which such backing sheets are retained.
This invention comprises apparatus by means of which the printing colors
adhering to the blanket (an endless felt or rubber cloth upon which the pressing
cylinder bears for the purpose of increasing the elasticity of the printing surface)
are prevented from being carried away with same into the drying-room and there
solidifying on the surface of the blanket: by this means the latter is readily cleaned
and preserved even when the machine works without any backing sheet, or without
any lateral backing bands intended to prevent to a certain extent, the colors from
being deposited on the blanket. In cylinder printing machines as heretofore usually
constructed, it has been necessary, even when a backing sheet was employed, to
thoroughly clean the blanket after the same had been in use for a short time and.
free it from the dried color sticking to it, this cleaning causing it to be rapidly
worn out. By the present invention this objection is overcome or obviated by
conveying the blanket, before its passage into the drying-room, through washing
apparatus as hereinafter described, so that the blanket does not enter the drying-
room until it has been freed from all the color adhering to it.
Referring to the drawings left with my Provisional Specification,
Fig. 1 is a side elevation, partly in section, and
Fig. 2 a longitudinal section of the washing apparatus;
Fig. 3 is a transverse section through the line I I of Fig. 2.
Fig. 4 represents in longitudinal and transverse sections a modified arrangement
of doctors hereinafter described,

page_text: As shewn, the washing apparatus is suitably arranged between the printing
machine and the drying-room, and comprises a table a, preferably made of sheet-.
iron of suitable size and shape, on which travels the blanket c which comes from
the printing machine b and is guided by rollers def. Above this table is arranged
a brush g, adjustable up and down by means of set screws and of springs on the
crank-shaped ends of the spindles h, k, so that the distance between the said brush
and the table a, or the blanket passing on the latter, can be lessened or increased
at will.
The spindles, h, h, revolve in brackets k secured to side cheeks which are
fastened to the beams i or other suitable supports of the drying-room. On the said
spindles are keyed bevel wheels m that gear into similar wheels n keyed on the
horizontal shaft o which revolves between the side cheeks . This shaft o also
carries a chain wheel p which is rotated, through the medium of a chain q and
chain wheel j, by the shaft r, to which motion is imparted by the blanket passing
on it, that is to say by the pressing cylinder and the printing rollers of the machine.
When the pressing cylinder is raised, the blanket is brought to rest and the
washing apparatus ceases to work.
Above the table a, are two perforated tubes u one in front and one in rear of
the brush, from which a number of jets of water are thrown on the blanket. This
water may be the condensation water from the drying-room which is supplied to
the tubes u by a pump of ordinary construction driven by the shaft r.
At one side of the water jets is arranged a doctor » (made of glass or of hardened
rubber) which presses out of the blanket the water previously absorbed by it so
that the blanket will dry rapidly, when it enters the drying-room.
บ
As substitutes for the doctor illustrated in Figs. 1 and 2, two doctors (Fig. 4)
may be employed, placed one behind the other, mounted so as to be able to move
about a pivot or fulcrum, and pressed against the blanket by means of weights v²
to which they are connected by ropes passing over grooved pulleys.
The table a is arranged in a slanting position, in order to allow the water and
the dissolved color to run down towards the lowermost roller e. A corresponding
slope is given to the brushes g, to their crank-shaft h h, and to the side cheeks ĭ,
in order that the brushes may press equally on all parts of the blanket c
below them.
Beneath the table is arranged a sheet iron screen or receptacle w, provided with
a discharge pipe, and, in order that the water, together with the color brushed off
the blanket, may reach the said pipe, one part or face of the roller e is made of
larger diameter than the rest either by bending or by reinforcing it, or it has a
certain pitch relatively to the discharge-pipe of the screen . Another sheet iron
screen, arranged above the washing apparatus, has for its object to prevent drops
of water from the sprinkling tubes being thrown on the printed. fabric a which
travels overhead towards the drying-room.
Having now particularly described and, ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. In working cylinder printing machines with or without backing-sheets, the
herein described method of cleaning the blanket and freeing it from adhering color
before it enters the drying-room, by washing it in a washing apparatus through
which it is conveyed, and squeezing out excess of water and color substantially as
described.
2. In a cylinder printing machine, a washing apparatus comprising an inclined
table a and a brush g, between which the blanket is caused to travel, the brush
being mounted on two crank-pins, so as to be adjustable vertically and arranged
to receive a to-and-fro motion from the driving shaft through the medium of a
bevel-gear, whilst water is sprinkled on the blanket from the pipes u, substantially
as described and shewn.
3. Ja washing apparatus of the kind referred to for the purpose set forth, one

page_text: or more adjustable doctors vor v¹ adapted to press out of the blanket, when the
same leaves the washing apparatus, the water it has absorbed, substantially as
described, andi shewn.
Dated this 19th.day of August 1891.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.