Improvements in Lithographic Printing Machines.
Year: 1892

page_text: Date of Application, 2nd June, 1892
Complete Specification Left, 1st Apr., 1893-Accepted, 27th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Lithographic Printing Machines.
We, CHARLES POLLARD and GEORGE BRAYSHAW, Printers Engineers, Elland
Road, Works, Leeds in the County of York, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to lithographic printing machines adapted more especially
for printing on sheets of tin plate or other metal.
We arrange two cylinders the one above the other, the one, which is an
impression cylinder, fed at the top from an inclined feeding board, and covered
with an ordinary impression blanket, the other, which is covered with a transfer
blanket, takes up the printed matter from the forme on the reciprocating table.
Each of the cylinders is provided with suitable brake apparatus worked by a
cam, preferably brake apparatus of the kind described in the Specification
No. 10,230 of 1887. Each sheet is fed into the machine with the side that is
to be printed uppermost, it is carried by suitable grippers between the impression
and the transfer cylinders, receiving the impression from the transfer, and it is
delivered with the printed side uppermost.
Suitable damping rollers are arranged between the inking rollers and the transfer
cylinder, and also if required on the other side of that cylinder. In order to
facilitate the movement of the diagonal rollers, we fit on the spindle of each at the
one end a sleeve which has collars holding it but allowing it to revolve in the
slotted roller bracket, and has a flange forming a roller which rests on the roller
bearer of the table, so that, as the table reciprocates, the diagonal roller is caused
to revolve by the running of the sleeve roller on the bearer, while the spindle of
the diagonal roller is free to move longitudinally through the sleeve.
Dated this 2nd day of June 1892.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Lithographic Printing Machines.
We, CHARLES POLLARD and GEORGE BRAYSHAW, Printers Engineers, Elland
Road Works, Leeds, in the County of York, 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 :-
Our invention relates to lithographic printing machines adapted more especially
for printing on sheets of tin plate or other metal.
We arrange two cylinders, the one above the other, the one, which is an
impression cylinder, fed at the top from an inclined feeding board, and covered
with an ordinary impression blanket, the other, which is covered with a transfer
blanket, takes up the printed matter from the forme on the reciprocating table.
Each of the cylinders is provided with suitable brake apparatus workel by a
cam, preferably brake apparatus of the kind described in the Specification
No. 10230 of 1887. Each sheet is fed into the machine with the side that is to be
printed uppermost, it is carried by suitable grippers between the impression and
the transfer cylinders, receiving the impression from the transfer, and it is delivered
with the printed side uppermost.
In order to facilitate the movement of the diagonal rollers, we fit on the spindle
077

page_text: of each at the one end a sleeve which has collars holding it but allowing it to
revolve in the slotted roller bracket, and has a flange forming a roller which rests
on the roller bearer of the table, so that, as the table reciprocates, the diagonal
roller is caused to revolve by the running of the sleeve roller on the bearer, while
the spindle of the diagonal roller, is free to move longitudinally through the sleeve.
Fig. 1 of the accompanying drawing shews an end view of the above described
arrangement of impression and transfer cylinders.
A is the impression cylinder and B is the transfer cylinder, C is the inclined
feeding table from which the sheets of metal D are fed on to the impression
cylinder, on which they are held in the usual manner by grippers E. The two
cylinders being made to revolve in the direction of the arrows by suitable gearing,
the cylinder A carries the metal sheet round to the cylinder B.
This is provided with an ordinary transfer blanket F which, as the cylinder
revolves while at the same time the table carrying the forme G passes underneath
it, receives an impression from the forme and carries it up to the metal sheet D so
as to transfer the impression thereto as it passes through between the cylinders.
As these continue to revolve they arrive in the position shewn on the drawing, in
which the sheet D being liberated in the usual manner from the grippers of the
cylinder A, can be removed therefrom by hand with its printed face uppermost.
When the grippers E have been carried by the cylinder beyond the edge of the
feeding table C, they take up another metal sheet, and the above described
operation is repeated.
Fig. 2 shews a part vertical cross section and Fig. 3 a part plan of the above
described arrangement for facilitating the longitudinal motion of the diagonal
inking rollers.
II is one of the diagonal inking rollers beneath which the inking table I and
forme are made to travel to and fro in the usual manner.
The spindle H' of the inking roller slides through the sleeve J, being provided
with a feather or stud H2 engaging with a groove in the sleeve, so that while the
roller H and its spindle are free to move to and fro in a longitudinal direction,
they are made to revolve with the sleeve.
The latter fits with a neck J¹ in the slot of the bracket K which may be either
of the construction described in Mann's Specification No. 914 of 1886, as shewn, or
of any other construction.
The sleeve is formed with a cylindrical enlargement J2 which constitutes a roller,
rolling upon the longitudinal bearing surface L, suitably fixed on the table.
Thus as the table I is traversed to and fro in the usual manner by gearing engaging
with the toothed rack M thereon, the roller J2 in rolling upon the surface L causes
the sleeve J and with it the spindle H¹ and inking roller H to revolve, while this
can at the same time shift longitudinally owing to its oblique position upon the
table I.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In lithographic printing machines for printing on sheets of tin plate or other
metal, arranging two cylinders one above the other, the upper one having the
metal sheets fed on to it from an inclined table at top, while the lower one, which
is covered with a transfer olanket, takes an impression from the forme and transfers
it to the plate as this passes between it and the upper cylinder, the plate being fed
on to the upper cylinder with its printed side uppermost and being removed
therefrom when it has been carried right round, so as to present its printed side
uppermost, substantially as described.
2. In lithographic printing machines, constructing the diagonally placed inking
rollers with their axis fitting loose with a key and feather into a sleeve having
collars which hold it in the slotted roller bracket, and having a flange, runner or

page_text: bowl that rests on the roller bearer of the table, so that the rotation of the diagonal
inking roller upon the table will be facilitated by the rolling of the runner of the
sleeve upon the roller bearer, while the axis of the roller is free to slide longi-
tudinally in the sleeve, substantially as described.
Dated this 1st day of April 1893.
ABEL & IMRAY,
Agents for the Applicants.