IMPROVEMENTS IN PRINTING MACHINES
Year: 1871

page_text: PROVISIONAL SPECIFICATION left by Samuel Bremner at the Office
of the Commissioners of Patents, with his Petition, on the 28th
July 1871.
I, SAMUEL BREMNER, Manager to Harrild and Sons, of Fleet Works,
25, Farringdon Street, in the City of London, Printers' Engineers and
Printing Machine Manufacturers, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN PRINTING MACHINES," to be as
follows:-
The object of the first part of the Invention, which applies to all
printing machines with rising feeding boards, and more particularly
to those with stopping or with tumbling cylinders, is to provide means
for stopping the movements of the feeding board, the grippers, the front
lays or paper guides, and the register points when the cylinder is
stopped or thrown out of gear, so as to prevent these parts acting
except at
every alternate movement of the table, when double inking is
required, or when the cylinder is thrown out of gear during single
inking; the attendant has therefore in each case more time to lay the
sheet.

page_text: The Invention further comprises a rapid method of shifting the front
lays when pointing has to be done, also means of giving a self-acting
travelling motion to the inking roller forks in order to roll the formes
more efficiently, also means of causing the vibrating roller and the
distributing rollers to change their positions in order to effect a perfect
distribution of the ink.
In carrying out my Invention I employ as usual two toothed wheels
gearing into each other, one having double the number of teeth of the
other, for the purpose of operating the gearing which stops the cylinder
while the second inking is being effected. The connecting rod from the
cam of this larger toothed wheel acts upon a bell crank, and through that
upon the vertical rod which stops the cylinder in the ordinary manner.
From this vertical rod is carried a horizontal arm, which is provided
with a wheel or roller on which the connecting rod from the cam on
the shaft of the smaller toothed wheel rests. Thus when the vertical
rod is lifted the connecting rod last named is raised, so that a hook
therein is freed from the lever arm on the shaft from which are carried
up the rods for lifting the feeding boards; this board therefore remains
down as long as the cylinder is at rest. A transverse shaft connected
by an arm to the vertical rod which puts the cylinder in and out of
gear carries at the opposite side of the machine a corresponding arm,
upon which rests the bottom of another vertical rod which works the
grippers. This vertical rod being thus held up at the same time as
the rod which stops the cylinder the connecting rod which actuates
the grippers is prevented falling back into the recess of its cam. Thus,
the grippers remain still until the vertical rods are allowed to fall. On
the connecting rod which actuates the register points is a stud, and
there is a corresponding hook on the vertical rod which actuates the
grippers; when this rod is held up as before explained the hook engages
the stud and prevents the connecting rod falling back into the recess
of its cam. Thus the register points likewise remain still until the
stud is freed by the falling of the rods, when all the parts will be put
into action simultaneously with the cylinder.
From the arrangements above described it will be seen that the
feeding board, the grippers, the front lays, and the register points act
only at every alternate movement of the table, so that double inking is
effected. In order to change the working of the machine to single
inking it is only necessary to put the connecting rod first named out

page_text: of
gear, when the larger toothed wheel will run idle and the various
parts will move at every motion of the table; but the attendant may if
necessary during single inking throw the cylinder out of gear by a lever
in the usual way, and the other parts will therefore by the mechanism
above explained remain at rest giving ample time for laying on the
sheet.
My mode of shifting the front lays consists in the employment of a
set screw or analogous device which passes through the feeding board,
and works against the lever on the lay bar below.
My means of giving a travelling motion to the inking roller forks
consists in making the forks at one side of the machine free to move in
a guide, so that when the table with the forme passes under the inking
rollers the friction shall cause the forks at one side to move in their
guide; the inking rollers thus receive a slight diagonal motion. These
forks may be fixed by a pin when required. The vibrating roller is
caused to change its position at the end of the backward travel of the
table by means of a cam which lifts it from the table and again allows
it to descend; thus in the forward movement of the table the several
parts of the periphery of the roller come respectively in contact with
different parts of the table to those they passed over in the backward
movement, the ink is thus spread more uniformly.
The distributing rollers are made to change their position by means of
inclines on the under side of the table which come against the ends
of levers and thereby cause the opposite ends of these levers to tem-
porarily lift the journals of the distributing rollers. Any lines or streaks
caused by irregularities of the rollers are thus avoided, perfect dis-
tribution being the result.