Improvements in Printing and Lithographic Presses.
Year: 1894

page_text: Date of Application, 9th May, 1894
Complete Specification Left, 8th Feb., 1895-Accepted, 13th Apr., 1895
PROVISIONAL SPECIFICATION.
Improvements in Printing and Lithographic Presses.
I, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields in the County of
Middlesex, Gentleman, do hereby declare the nature of this invention (which has
been communicated to me from abroad by the Firm of Faber and Schleicher
Offenbach, on the Main in the German Empire, Machine Builders) to be as
follows:-
The object of this invention is to increase the working capacity of what are
known as $6
Rapid" printing presses, and this object is attained by a reduction of
the periphery of such roller with a view to making such periphery considerably
smaller than the distance which the carriage is required to travel in any given case.
By such means the machine works more efficiently than hitherto, and is enabled to
turn out in a given space of time a quantity of work exceeding by about one third
the amount of work yielded by the presses hitherto employed.
In carrying out the invention in practice a printing roller or cylinder is provided
the periphery of which, as before stated, is reduced so as only to leave a sufficient
printing surface and allow for the satisfactory operation of gripping and stretching
devices, and is rigidly connected with a toothed wheel. The said wheel carries a
lateral steel tooth engaging in a slot provided for the purpose in a lever loosely
mounted upon a pivot. The upper and lower parts of this lever carry lateral
projections or studs adapted to engage in corresponding slots formed in a second
lever mounted upon the same pivot; both levers being by such means coupled
together. The second lever which is adjustable upon its pivot, is arranged to be
acted upon by a connecting and disconnecting fork which is operated by an
eccentric mounted upon a shaft driven direct from the main shaft of the machine.
The projections or studs on the first lever are of such size that, whatever the
position of the second lever, they never leave the slots of this lever, or in other
words the connection between the two levers is in no case severed, whatever may
be the position of either lever. According to the position of the second lever, the
roller attached to its free end is in, or out of, engagement with an eccentric guide
formed in the carriage, and which has rectilinear guiding ends on both sides.
When the said carriage has reached the right hand end of its course or stroke,
the second lever is moved by the eccentric and the fork into the eccentric guide,
together with its roller. As the carriage then advances, the said lever imparts the
motion which it receives from the eccentric guide to the first lever, with the result
that this lever, by the aid of the tooth or tappet causes the toothed wheel to engage
with a rack secured to the carriage. The cylinder or roller in the meantime
continues to revolve, and as soon as it has completed one revolution, is intercepted
by the first lever through the medium of the said tooth or tappet. When this
engagement takes place, the eccentric lever is shifted sideways by the fork. It then
leaves the eccentric guide, together with its roller, and by means of a pin situated
opposite to such roller engages in a slot provided in a bridge firmly secured to the
frame of the machine, whereby the lever and the printing roller are instantly
stopped. The lever can only be thrown into, or out of, engagement with the
eccentric guide while such guide is moving with its straight-lined portions past the
roller of the second lever. During the return movement of the carriage, the roller

page_text: of the eccentric lever remains outside the guide and does not re-enter it until the
carriage resumes its initial position again and starts afresh.
Dated the 9th day of May 1894.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, Agents.
Improvements in Printing and Lithographic Presses.
1, JAMES YATE JOHNSON of 47 Lincoln's Inn Fields, in the County of
London, Gentleman do hereby declare the nature of this invention (which has
been communicated to me from abroad by the Firm of Faber & Schleicher,
Offenbach on the Main in the German Empire, Machine Builders) and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
The object of this invention is to increase the working capacity of what are
known as "Rapid" printing presses, and this object is attained by a reduction of
the periphery of such roller with a view to making such periphery considerably
smaller than the distance which the carriage is required to travel in any given case.
By such means the machine works more efficiently than hitherto and is enabled to
turn out in a given space of time a quantity of work exceeding by about one third
the amount of work yielded by the presses hitherto employed.
The invention will be best understood by reference to the accompanying drawings
in which
Figure 1 is a side elevation of the improved printing press constructed according
to this invention; and Figure 2 is a transverse section of the same.
Figure 3 is a side elevation and Figure 4 a plan partly in section of the
mechanism operating the priuting roller or cylinder.
A printing roller or cylinder a, the periphery of which, as already stated, is
reduced so as only to leave a sufficient printing surface and allow for the satisfactory
operation of the gripping and stretching devices, is rigidly connected with a toothed
wheel b. The said wheel carries a lateral steel tooth / engaging in a slot pro-
vided for the purpose in a lever c loosely mounted upon a pivot r. The upper and
lower parts of this lever carry lateral projections or studs cl 2 adapted to engage
in corresponding slots formed in a three armed lever d mounted upon the same
pivot both levers being by such means coupled together. The lever d which is
adjustable upon the pivot r is arranged to be acted upon by a connecting and
disconnecting fork (Figures 3 and 4) which is operated by a cam g mounted upon
a shaft g' driven direct from the main shaft of the machine. The projections or
studs c¹² on the lever care of such size that, whatever be the position of the
lever d, they never leave the slots formed in the lever and thus the connection
between the two levers c and d is in no case severed, whatever inay be the position
of either of the said levers. According to the position of the lever d a roller d²
attached to its free end in, or out of, engagement with a cam groove e formed in
the carriage y of the machine which has a horizontal guiding part at each end.
The operation of the machine is as follows-
When the carriage y has reached the right hand end of its course or stroke
(Figure 1) the lever d with its roller d² is moved by the cam g and the fork f into
the cam groove e.
As the carriage then advances the said lever d imparts the
motion which it receives from the cam groove e to the lever c with the result that
this lever, by the aid of the tooth or tappet I, causes the toothed wheel b to engage
with the rack b² secured to the carriage, the tappet / keeping the wheel b always in
a position for the teeth of the latter to engage with the teeth of the rack 62 (which
is on the carriage y) as soon as the carriage moves forward. The cylinder or

page_text: roller in the meantime continues to revolve, and as soon as it has completed one
revolution it is intercepted by the lever c through the medium of the said tooth or
tappet l. When this engagement takes place the lever d is shifted sideways by
the fork f. It then leaves the guide e, together with its roller, and by means of a
pin situated opposite to such roller engages in a slot provided in a bridge or
block d' firmly secured to the frame of the machine whereby the lever c and the
printing roller a are instantly stopped. The lever d can only be thrown into, or
out of, engagement with the cam groove or guide e while such guide is moving
with its horizontal portions past the roller d of the lever d. During the return
movement of the carriage, the roller of the said lever d remains outside the guide e
and does not re-enter it until the carriage y resumes its initial position (Figures 1
and 3) and starts afresh.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I
claim is
1. A quick printing roller press, in which the printing roller having a circum-
ference less than the length of the carriage path or way, is caught or intercepted by
a lever such as c, directly operated by the carriage and arrested whilst the carriage
is performing its return movement substantially as aud for the purposes herein before
described.
2. In a printing press of the kind claimed in the preceding claiming clause
operating the intercepting lever such as c by means of a cam groove, such as e with
which the carriage is provided, through the medium of a lever, such as d, the roller
of which is adapted to be thrown into and out of gear with the cam groove, by a
cam, such as g mounted on the main shaft, and by a fork such as f, while for
arresting the roller a, when the said lever d is thrown out of gear with the said
cam groove e, a pin such as d³ provided on the said lever, engages in the groove
of an arresting block or bridge, such as d', secured to the machine frame all
substantially as described.
Dated this 9th day of February 1895.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, Agents.