Improvements in the Inking Apparatus of Letter-press and Lithographic Printing Machines.
Year: 1891

page_text: Date of Application, 27th Jan., 1891
Complete Specification Left, 26th Oct., 1891-Accepted, 12th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Inking Apparatus of Letter-press and
Lithographic Printing Machines.
We, WILLIAM HENRY DAWSON and ALLAN PARKER DAWSON of the firm
of William Dawson and Sons, Ashfield Foundry, Otley in the County of York,
Printers Engineers, and JAMES STOTT, of the same place, Foreman, do hereby
declare the nature of this invention to be as follows:-
This invention relates to certain improvements in the operation of the rollers
used for supplying ink to the forme or stone in that class of printing machines in
which a reciprocating table constitutes the bed or support for the type or stone,
and a revolving cylinder carries the sheet to be printed; and has for its object,
the arrangement of the inking mechanism in such a manner so that, the ink is
transferred from the inking slab to the type forme or stone more uniformly and
thereby to produce impressions on the paper having less variations in the density
between one end of the sheet and the other.
We accomplish our object by an arrangement whereby the inking rollers are
lifted by cams and levers clear of the forme or stone during a portion of the travel
of the table, and bringing each roller into contact with the type forme or stone at
intervals, thus giving to the rollers an intermittent rotary motion, the rollers
being brought into contact with sections of the forme or stone in such a manner
that each section of the forme or stone is inked with virgin ink by a roller that
has not rolled over any other portion of the forme or stone, this is repeated until
the whole is inked, and on the return of the table the rollers are allowed to
remain in contact with the type forme or stone by which a more perfect distribu-
tion of the ink is effected, and therefore a more uniform impression on the paper
obtained.
Dated this 26th day of January 1801
JOHN WAUGH,
Agent.
COMPLETE SPECIFICATION.
Improvements in the Inking Apparatus of Letter-press and
Lithographic Printing Machines.
We, WILLIAM HENRY DAWSON, and ALLAN PARKER DAWSON, of the firm
of William Dawson and Sons, Ashfield Foundry, Otley, in the County of York,
Printers Engineers, and JAMES STOTT, of the same place, Foreman, 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 the operation of the rollers
used for supplying ink to the forme or stone in that class of printing machines, in
which a reciprocating table constitutes the bed or support for the type or stone and
a revolving cylinder carries the sheet to be printed; and has for its object,
the arrangement of the inking mechanism in such a manner that, the ink is
transferred from the inking slab to the type forme or stone more uniformly, and
thereby to produce impressions on the paper having less variations in density
between one end of the sheet and another.
The inking of the forme or stone on this class of machine has hitherto been
accomplished by a series of composition rollers inked from the slab and placed in a
similar position as those shown on the drawing, by which arrangement in

page_text: consequence of all the rollers being in contact with the entire length of the forme
or stone, the major portion of the ink is deposited on one end of the same, the
density of the ink gradually diminishing towards the other end thereby giving rise
to unevenly printed work.
In describing our invention in detail reference is made to the accompanying
sheet of drawings in which
Fig. 1. represents the outline of an impression cylinder and a portion of the
frame of a printing machine to which our improvement is added.
Fig. 2. is a sectional plan through line a. b.
Fig. 3. a detail end view of one of our additional journals for supporting the
inking rollers, and
Fig. 4. a side view of the same with a portion of the rollers.
The impression cylinder A. reciprocating table B and ink distributing
apparatus C. are constructed and operated in the usual manner, the type forme D.
and inking slab E. being also attached to the reciprocating table as hitherto.
The inking rollers F. for transferring the ink from inking slab E. to the type
forme or stone D. are retained in position by, but free to revolve in slotted
brackets G. two of the rollers being supported by the additional journals H.
placed at each side of the machine and which are operated in a vertical direction in
the manner as hereinafter described.
On the rotating shaft J. supported in any convenient manner are secured two
adjustable cams K. each of which on rotating, operates a lever L. supported on
fulcrum M. the opposite end of each lever L. being in contact with a lever N.
secured on shaft O. at each end of which is another lever P. upon which rests a
bar Q. adjustable as regards length by screwed socket R. and lock nut.
At the top of each bar Q. is attached an additional journal block H. arranged
so that, when the two rollers supported by same are raised, the roller F. next the
impression cylinder A. is furthest from the table which is accomplished by the
bottom of the journal being a little higher than the bottom of the journal of
the adjacent roller, by which means, on lowering the rollers F. they are brought
into contact with the type forme or stone at different times.
When the inking slab E. and forme or stone D. are moving in the direction of
the arrow, the cams K. are in such position as allows all the inking rollers F. to be
in contact and rotate over the surface of the said forme or stone D. and slab E.
but on the return of the table the rotating cams K. will have arrived somewhat
in the position shown in Fig. 1. and operated the levers so that, two of the inking
rollers F. supported by the additional journals H. are raised clear of the type
forme or stone D. the other roller F. resting in the bottom of the ordinary journal
bracket G. as hitherto, so that it will first come in contact and transfer virgin ink
to a predetermined section of the type forme or stone, the rotating cams K. will
then have arrived in such position as will allow the bars Q. to descend some
distance until the second inking roller F. is in contact, after which the rotating
cams K. allow the third roller F. to descend and ink the remaining section with
virgin ink, thus by means of the three rollers, virgin ink is distributed to different
sections of the forme or stone D. and by the cams K. being constructed so as to
allow all the rollers to remain down until the table and forme have returned, the
ink is more uniformly distributed, therefore the impression on the paper is
more equal in density than is the case when the ink is supplied in the usual
manner.
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 a printing machine the operation of the ink distributing rollers F. in such
a manner that during one portion of the travel of the forme or stone D. and inking
slab E. the rollers F. are brought alternately into contact with the type forme or
stone for the purpose as hereinbefore set forth.

page_text: 2. The combination of the parts forming the ink distributing apparatus to the
forme or stone D arranged substantially in the manner and for the purpose herein
set forth and illustrated by the accompanying drawings.
Dated this 23rd day of October 1891.
JOHN WAUGH,
Agent.