ROV IN PRINTING MACHINES &
Year: 1885

page_text: I, ALEXANDER MELVILLE CLARK, of the Firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for AN IMPROVEMENT
IN PRINTING MACHINES & communication to me from abroad by Philip Jackson of
Plainfield in the County of Union and State of New Jersey, United States of
America, Engineer to be as follows:-
This Invention relates to two revolution printing presses and has for its object to
raise the impression cylinder during the return of the type bed.
The impression cylinder is mounted in vertically sliding bearings and may be
pressed downward by springs. On each end of its shaft is keyed a cogwheel which
is made in one with a smooth edged disc. Each of said combined cog wheels and
discs rests upon and gears with a combined cam disc and cogwheel mounted on an
adjustable axis affixed to the frame. The outline of the cogwheel may either
coincide with that of the cam disc or it may be circular, if preferred, as the rise of
the cam is so slight that circular, wheels can be used. In either case the cog wheels
on the cylinder shaft remain constantly in gear with those of the supporting cams
whose revolution is so timed as to automatically raise the impression cylinder as
hereafter described. The impression cylinder is continually revolved in the same
direction by suitable gearing and when the type table passes under the cylinder
and the impression is being made the cylinder is pressed on the type table, those
parts of the cam discs having the smaller diameter then coming into position
beneath the 'cylinder shaft to permit of the downward motion of its journal boxes.
When the type table makes its return movement those parts of the cam discs
baving the larger diameter come into operative position beneath the cylinder shaft
and raise the cylinder so that the cylinder will not be in contact with the type
table. The pivots on which the cam wheels are mounted is eccentric to the studs
by which they are bolted to the frame so that by turning the studs the wheels can
be adjusted to raise the cylinder more or less.

page_text: An Improvement in Printing Machines.
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Wm. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of the said Invention for AN IMPROVEMENT
IN PRINTING MACHINES (a communication to me from abroad by Philip Jackson of
Plainfield in the County of Union and State of New Jersey United States of
America Engineer) 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 two revolution printing presses and has for its object to
raise the impression cylinder during the return of the type bed.
The invention consists in the construction and combinations of parts as will be
hereinafter fully described and claimed.
Reference is to be had to the accompanying drawings forming a part of this
specification in which similar letters of reference indicate corresponding parts in
both the figures.
Figure 1 is partly a longitudinal and partly a longitudinal sectional elevation of
the improvement in printing presses. Figure 2 is an end view of the same.
The journals A of the impression cylinder B are mounted in two vertically
sliding journal boxes C; pins E provided with heads project downward from the
journal boxes into recesses in the frame as shown. Springs D surround the pins E
and act to effect a downward pressure when the weight of the cylinder is
insufficient. On each end of the shaft of the cylinder B is keyed a cog-wheel F
which is made in one with a smooth edged disc G.
Each of said combined cog-wheels and discs rests upon and gears with a
combined cam disc J and cogwheel K mounted on an adjustable axis affixed
to the frame H,
The outline of the cogwheel K may either coincide with that of the cam disc J
or it may be circular if preferred as the rise of the cam is so slight that circular
wheels can be used.
In either case the cogwheels on the cylinder shaft remain constantly in gear
with those of the supporting cams whose revolution is so timed as to automatically
raise the compression cylinder as hereafter described. The impression cylinder B is
continually revolved in the same direction by suitable gearing and when the type
table passes under the cylinder and the impression is being made the cylinder is
pressed on the type table by the springs D, those parts of the cam discs J having
the smaller diameter then coming into position beneath the cylinder shaft to
permit of the downward motion of its journal boxes.
When the type table makes its return movement those parts of the cam discs J
having the larger diameter come into operative position beneath the cylinder shaft
and raise the cylinder B so that the cylinder will not be in contact with the type
table. The pivots N on which the cam discs J are mounted are eccentric to the
studs M by which they are bolted to the frame, so that by turning the studs the
cam discs J can be adjusted to raise the cylinder more or less.

page_text: 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. The combination with an impression cylinder and gearing at opposite sides of
the same, of cam discs journaled below the cylinder for raising the same and
gearing connected with said cam discs and meshing with the cylinder gearing,
whereby, when the cylinder is rotated the cam discs will be rotated to raise the
same automatically substantially as set forth.
2. The combination of an impression cylinder the shaft of which on both sides of
the said cylinder is provided with gear wheels and plain discs with two gear wheels
mounted below said cylinder and provided with cam discs the said upper and
lower gearing meeting and plain and cam discs contracting; whereby the cylinder
will be automatically lifted substantially as set forth.
3. In a printing press the combination with the cylinder B of the wheels F. G
and the combined cam discs and spur wheels J K mounted eccentrically on studs M
substantially as herein shown and described.
Dated this 22nd day of July 1885.
A. M. CLARK.
By A. M. & Wm Clark,
Patent Agents,
53, Chancery Lane, London.