IMPROVEMENTS IN PRINTING MACHINES
Year: 1885

page_text: We, THOMAS GALLOWAY DAWSON and JEREMIAH DAWSON, of Ashfield Foundry,
Otley, in the County of York, Printers' Engineers, do hereby declare the nature of
our invention for IMPROVEMENTS IN PRINTING MACHINES to be as follows:-
This invention relates to certain improvements in that kind of flat bed Perfecting
printing machines, in which, hitherto two rising and falling impression cylinders of
equal diameter making two revolutions to one forward and backward motion of
the table, have been used; and has for its object the combination of two impression
cylinders of different sizes, fitted with grippers, and the location and arrangement
of a gripper flyer drum in such a manner, that better access to the cylinders and
forms is obtained; and the paper printed and delivered with moro accuracy and
regularity than heretofore, which we accomplish in the following manner:
Hitherto in machines of this class, the second form cylinder is lifted clear of the
type when the first form cylinder is printing, thereby to a considerable extent
separating the driving gear, by which a back lash is created, and a jarring irregular
motion imparted to the cylinder, thus imparing the quality of the printing.
According to our arrangement, the impression cylinders are mounted and geared
side by side on suitable framework and driven in unison with the tablo from a
shaft which also drives the table; but instead of making the cylinders of equal
diaineter as hitherto, we make the second impression cylinder about double the
diameter of the first, and cut away or reduce a portion of its circumference for
clearance, by which we are enabled to dispense with the usual lifting motion, and
to use finer close fitting geared driving wheels, thereby reducing the back lash and
jarring common to machines of this class.
By increasing the diameter of the second impression cylinder as before described,
and applying grippers thereto, we dispense with tapes for carrying the paper round
the impression cylinders; and also we are enabled to locate the flyer cylinder at an
elevation above the second impression cylinder, which gives the attendant an
uninterrupted access to the cylinders and forms for overlaying and other purposes.

page_text: We THOMAS GALLOWAY DAWSON and JEREMIAH DAWSON of Ashfield Foundry
Otley in the County of York Printers 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 :—
This invention relates to certain improvements in that kind of flat bed Perfecting
printing machines, in which hitherto two rising and falling impression cylinders of
equal diameter making two revolutions to one forward and backward motion of
the table have been used; and has for its object, the combination of two impression
cylinders of different sizes fitted with grippers, and the location and arrangement
of a gripper flyer drum in such a manner, that better access to the cylinders and
forms is obtained; and the papers printed and delivered with more accuracy and
regularity than heretofore which we accomplish in the following manner.
Hitherto in machines of this class the second form cylinder is lifted clear of the
type when the first form cylinder is printing; thereby to a considerable extent
separating the driving gear, by which a back lash is created, and a jarring irregular
motion imparted to the cylinder, thus imparing the quality of the printing.
According to our arrangement, the impression cylinders are mounted and geared
side by side on suitable framework and driven in unison with the table from a
shaft which also drives the table; but instead of making the cylinders of equal
diameters as hitherto, we make the second impression cylinder about double the
diameter of the first; and cut away or reduce a portion of its circumference for
clearance, by which we are enabled to dispense with the usual lifting motion and to
use finer and close fitting geared driving wheels, thereby reducing the back lash
and jarring common to machines of this class.
By increasing the diameter of the second impression cylinder as before described
and applying grippers thereto, we dispense with tapes for carrying the paper round
the impression cylinders, and also we are enabled to locate the flyer cylinder or
drum at an elevation above the second impression cylinder, which gives the
attendant an uninterrupted access to the cylinders and forins for overlaying and
other purposes.
In the accompanying drawings Fig. 1 represents the side elevation of such
portions of a printing machine as are required to explain our invention, and Fig. 2
is a plan of the same.
The impression cylinders A and B are mounted on the framework C, and driven
in unison with the type table from the shaft D, by the spur wheels E,-F and G;
The two latter wheels are secured on the same shaft, and the wheel G gears into a
wheel G¹ secured on the end of the shaft of cylinder B which gears into the
wheel G³ secured on the end of shaft of cylinder A, thus by these means both
cylinders aro driven from the shaft D.
The first impression cylinder A, is mounted in movable bearings, and raised for
clearance of the type every alternate revolution; by the cranks H, adjustable
rods H¹ and eccentrics H operated in the usual manner, The second impression
cylinder B, is mounted in stationary bearings, is double the diameter of the first

page_text: impression cylinder A, and cut away or reduced for a portion of its circumference
as shewn by the dotted lines at B1 for clearance of the type; by which we are
enabled to dispense with the usual lifting motion and thus use finer and close
fitting driving wheels.
By increasing the diameter of the second impression cylinder B, and applying
the grippers J and J to the respective cylinders A and B, we dispense with the
tapes for carrying the paper around the impression cylinders. It is fed from
the usual board K, against the ordinary feed gauges L, which are raised on the
grippers J, securing the paper, and remain so until one side of the paper is printed
and the grippers arrive at the point M, when they open and allow the grippers J¹
to convey the paper around the second impression cylinder to receive the impression
on the opposite side of the paper.
On the paper arriving near the top of the cylinder B, the grippers J¹ release the
same for removal by the grippers J2 mounted on the flyer drum N, which transfer
it to the tapes P, and is removed therefrom by the flyer arms Q operated by the
cam R, on the cylinder shaft. The cam actuates the rack rod S, which gears with a
pinion S¹ secured on the flyer shaft, thereby causing the flyer arms to oscillate and
remove the sheets from the tapes P, on to the delivery board T, thus giving to the
attendant an uninterrupted access to the cylinders and forms for overlaying and
other purposes.
The apparatus for opening and closing the grippers, actuating the feed gauges
and the traversing table are the ordinary well known methods and form no part of
our invention.
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
Flat bed perfecting printing machines arranged with two impression cylinders
of different diameters, fitted with grippers or their equivalents one of the cylinders
being mounted in movable and the other in stationary bearings all arranged
substantially in the manner and for the purpose as herein before described, and
as illustrated by the accompanying drawings.
Flat bed perfecting printing machines fitted with two cylinders one of which is
reduced for clearance and makes one revolution while the other makes two.
Flat bed perfecting printing machines in which is combined with the single
revolution cylinder B supported by stationary journals the flyer drum N, substan-
tially in the manner shewn and for the purpose described.
Dated this 9th day of December 1885.
WAUGH & CHAPMAN,
Agents,