An Improvement in "Stop Cylinder" Printing Machines.
Year: 1889

page_text: Date of Application, 19th Aug., 1889-Accepted, 12th Oct., 1889
COMPLETE SPECIFICATION.
An Improvement in "Stop Cylinder" Printing Machines.
We, JOSEPH FOSTER, FRANCIS FOSTER, JAMES YATES FOSTER, and ALFRED
FRANCIS BATTEY all of Bow Lane Iron Works, Preston in the County of Lancaster,
Engineers 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 :-
"
In that class of printing machines known as stop cylinder" machines it is
necessary from time to time to prevent the cylinder from revolving and stop the
action of the grippers and feed, it is also sometimes necessary to give the forme
double rolling. Our invention relates to means of stopping the cylinder so arranged
that the striking off or stopping gear can be actuated by hand at any point in the
movement in the machine, but that it does not affect the stoppage except at the proper
point of the movement. Our invention relates also to ready means of causing the
machine to effect double rolling when required. The accompanying drawing
represents so much of the side view of a stop cylinder as is necessary to explain
our invention. Many of the parts represented in the drawing are known and in
use, but it is necessary to refer to them in order that the action of the novel parts
according to our invention may be the better understood. The cylinder as usual has on
its axis a loose wheel on which is mounted the drop catch A with a roller a that rolls
along a curved guide or incline G on the upper part of a rod 1. When this rod I is
raised the drop catch A is disengaged from the stop B on the cylinder which then
stops when the rod I is lowered the catch A engages with the stop B and the cylinder
is caused to revolve. C is the cam on the main shaft of the machine, against which
cam a roller on the push bar D is made to bear by a loaded bell crank lever E, so
that as the cam C revolves the push bar D is made to move to and fro, and its end
abutting against the upright arm F of a bell crank lever, the horizontal arm H of
which is jointed to the rod I, this rod and the incline G are alternately raised and
lowered, J is a handle having a crank pin j, engaged in the slot at one end of the
One end of this
lever K, the other end of which is linked by a rod L to a lever M.
lever is loaded with a weight m¹ the other end carries a roller m immediately under
the push bar D.
When the handle J is turned half round, the lever K is moved to the position
indicated by the dotted lines, the rod L being thus depressed, leaving the lever M free
to move to the dotted position M' in obedience to its load m¹ so as to raise the bar D.
But if at this time the push bar D is bearing against F the weight m³ is not sufficient
to overcome the frictional contact and consequently the bar D is not raised until the
cam C presents its hollow allowing the push bar D to retreat from F. At this moment
the frictional contact between D and F being relieved the load m¹ descends raising the
roller m and raising the push bar D to the dotted position so that its end, although
still engaged in the slot of F no longer buts against F but leaves it free to move to
the left allowing the rod I and incline & to descend. In order to effect double rolling
when required we provide a second cam Z on a counter shaft driven by gearing from
the main shaft at half the speed and at the side of the push bar D and bell crank F H
we provide a second set of these moved from this second cam Z. When it is
desired to effect single rolling this second push bar D is raised by hand and held
up by engaging a pin on the push bar on a bracket O, but when it is desired to effect
donble rolling this is disengaged from the bracket O and thus the incline G can be
made to reciprocate either once in each revolution of the main shaft or once in every
two revolutions as may be desired.

page_text: 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 combination with the pusher bar D, the loaded lever M, and the slotted
connecting rod L linking it to the lever K substantially as and for the purpose
set forth.
2. For effecting single or double rolling at will, the duplication of the pusher
bar D and its connections and the second cam Z driven at half the speed of the main
cam substantially as described.
Dated this toth
J 1000
ABEL & IMRAY,
Agents for the Applicants.