Improvements in Printing Machines.
Year: 1895

page_text: Date of Application, 26th Oct., 1805
Complete Specification Left, 25th July, 1896-Accepted, 29th Aug., 1896
Improvements in Printing Machines.
I, THOMAS COULTHARD, of Cooper Road, Preston, in the County of
Lancaster, Machinist, do hereby declare the nature of this invention to be as
follows:-
This invention relates to impression cylinders for continuous web printing
machines more especially of that class which have flat type beds and one or more
impression cylinders and has for its object to provide improved arrangements for
frictionally driving or rotating such cylinders.
According to my former Patent No. 10,687 of 1891 the impression cylinders
were made with their outer part or periphery in the form of a sleeve or shell
separate from their spindle or axis and the required friction or hold between the
the outer sleeve and the spindle was effected at each end of the sleeve by means of
a fast collar adjustable screw nuts and interposed leather washers.
By my present invention I make the cylinder-which may be either solid or
hollow-fast upon its shaft or spindle and apply the frictional device to the hub or
boss of the ordinary toothed driving piuion. The said pinion is loose or rotatable
upon the spindle the latter being provided with a fast collar and suitable adjusting
screw nuts between which and interposed leather washers the ends of the hub or
boss of the pinion are squeezed and the required frictional contact or drag thereby
obtained.
Improvements in Printing Machines.
I, THOMAS COULTHARD, of Cooper Road, Preston, in the County of
Lancaster, Machinist, 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 impression cylinders for continuous web printing
machines more especially of that class which have flat type beds and one or more
impression cylinders and has for its object to provide improved arrangements for
frictionally driving or rotating such cylinders.
According to my former Patent No. 10,687 of 1891 the impression cylinders
were made with their outer part or periphery in the form of a sleeve or shell
separate from their spindle or axis and the required friction or hold between the
outer sleeve and the spindle was effected at each end of the sleeve by means of a
fast coliar adjustable screw nuts and interposed leather washers.
By my present invention I make the cylinder-which may be either solid or
hollow-fast upon its shaft or spindle and apply the frictional device to the hub or

page_text: boss of the ordinary toothed driving pinion. The said pinion is loose or rotatable
upon the spindle the latter being provided with a fast collar and suitable adjusting
screw nuts between which and interposed leather washers the ends of the hub or
boss of the pinion are squeezed and the required frictional contact or drag thereby
obtained.
In the accompanying drawing-which is a view partly in section of so much of
an impression cylinder as is necessary to illustrate the nature of my improvements
-a is the central shaft or spindle and b the outer sleeve or shell keyed fast on to
the shaft a as indicated by broken lines at c. d is the neck or journal part of the
shaft a and e a fast collar thereon. is the ordinary toothed driving pinion loose
or rotatable upon the shaft a and g g¹ are the adjusting screw nuts. hh are
washers of leather-or they may be of any other suitable material-on each side
or end of the hub or boss of the pinion f. i is a metal washer which may if
desired be interposed between the outer leather washer h and the inner screw
nut g¹.
By the above described arrangement if the outside diameter of the impression
cylinder should be such that its rotating surface speed should not exactly corre-
spond with the speed of the face of the type traversing underneath the bite between
the type and the periphery of the cylinder will cause the rotating speed of the
cylinder to be retarded or accelerated so as to accommodate itself to the speed of
the type table. On the other hand when the impression cylinder is raised the
friction or drag between the fast collar and screw nuts of the central shaft and the
hub or boss of the driving pinion will cause the impression cylinder to be rotated
at its normal speed and to carry forward in the usual way the paper passing
underneath it.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. In continuous web printing machines the use or employment of impression
cylinders having a frictional driving device consisting of a toothed pinion wheel a
fast collar and adjusting screw nuts on the central shaft of the impression cylinder
and leather (or equivalent) washers interposed between the fast collar and the
pinion wheel on the one side and between the inner adjusting screw nut and the
pinion on the other side the said parts being arranged and operating substantially
as herein described and shown in the drawing.
Dated this 95th de-
1000
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.