Improvements in Chromatic-printing Machines.
Year: 1892

page_text: Date of Application, 27th June, 1892
Complete Specification Left, 11th Nov., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Chromatic-printing Machines.
I, Sir RICHARD HENRY WYATT, Knight, of 38, Grosvenor Place, in the
County of Middlesex, do hereby declare the nature of this invention to be as
follows:-
The object of my invention is to provide a chromatic-printing device which can
be used on any ordinary printing-press in connection with the usual stereotype-
plates and will make chromatic impressions while such plates are making common
black impressions. I attain this object by means of certain improvements upon the
mechanism for which I obtained Letters Patent No. 12182, dated the 31st July 1889.
The Specification of the said Letters l'atent contains a description of a form-
cylinder with the ordinary fixed stereotype-plates and other relatively-movable
plates which are raised and lowered for independent inking and held in three
successive positious-viz., above, below, and even with the surface of the fixed
plates by means of lipped wedges beneath them, attached to and operated by
reciprocating bars working in longitudinal recesses of the form-cylinder, the said
bars receiving their motion as the cylinder revolves from cams fixed to the frame
of the machine. My present improvements relate exclusively to the mechanism
operating the said movable plates. As I find it convenient to use a reinforcing-
plate beneath the regular movable stereotype-plate, to prevent confusion I will
hereinafter use the expression "fixed printing-surface" to signify the ordinary fixed
stereotype and "movable printing-surface" to signify the relatively-movable stereo-
type together with its reinforcing-plate and anything else rigidly attached to it and
partaking of its motion.
The said improvements comprise the combination of a fixed printing-surface or
surfaces with a movable printing-surface or surfaces and a rotary cam or cams
beneath the latter, such cam or cams being so shaped with reference to the movable
printing-surface or surfaces as to hold them firmly and depress as well as elevate
them.
I employ a system of interrupted gearing in combination with the shaft or shafts
bearing the said cam or cams rotated intermittently by such gearing, the movable
printing-surface or surfaces being successively raised, lowered, and held fast by the
said cam or cams through the intermittent rotation of such shaft or shafts.
The form-cylinder has longitudinal recesses, and the printing-surface or surfaces
is or are supported on the said cylinder by shafts rotated in the said recesses by
the rotation of the cylinder.
The interrupted gearing advantageously consists of a wheel or its equivalent
provided alternately with teeth or cogs and convex smooth surfaces, and a second
toothed-wheel meshing with the teeth of the first and provided with concave
projections corresponding to the smooth surfaces of the first.
The holders or supports for the cam-shaft or shafts are movable and laterally
adjustable within the recesses.
G..F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant..

page_text: COMPLETE SPECIFICATION.
Improvements in Chromatic-printing Machines.
1, Sir RICHARD HENRY WYATT; Knight, of 38, Grosvenor. Place, in the
County of Middlesex, do hereby declare the nature of this invention (a communi-
cation to me by John Arthur Barratt, of 11, Pine Street, New York, in the United
States of America, Counsellor-at-Law) 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 my invention is to provide a chromatic-printing device which can
be used on any ordinary printing-press in connection with the usual stereotype-
plates and will make chromatic impressions while such plates are making common
black impressions. I attain this object by means of certain improvements upon
the mechanism for which I obtained Letters Patent No. 12182, dated the 31st July
1889. The Specification of the said Letters Patent contains a description of a
form-cylinder with the ordinary fixed stereotype-plates and other relatively-
movable plates which are raised and lowered for independent inking and held
in three successive positions, viz., above, below, and even with the surface of the
fixed plates, by means of lipped wedges beneath them, attached to and operated
by reciprocating bars working in longitudinal recesses of the form-cylinder, the
said bars receiving their motion as the cylinder revolves from cams fixed to
the frame of the machine. My present improvements relate exclusively to the
mechanism operating the said movable plates. As I find it convenient to use a
reinforcing-plate beneath the regular movable stereotype-plate, to prevent confusion
I will hereinafter use the expresssion "fixed printing-surface" to signify the
ordinary fixed stereotype and "movable printing-surface" to signify the relatively-
movable stereotype together with its reinforcing-plate and anything else rigidly
attached to it and partaking of its motion.
The said improvements comprise the combination of a fixed printing-surface or
surfaces with a movable printing-surface or surfaces and a rotary cam or cams
beneath the latter, such cam or cams being so shaped with reference to the
movable printing-surface or surfaces as to hold them firmly and depress as well as
elevate them.
I employ a system of interrupted gearing in combination with the shaft or shafts
bearing the said cam or cams rotated intermittently by such gearing, the movable
printing-surface or surfaces being successively raised, lowered, and held fast by the
said cam or cams through the intermittent rotation of such shaft or shafts.
The form-cylinder has longitudinal recesses, and the printing-surface or surfaces
is or are supported on the said cylinder by shafts rotated in the said recesses by the
rotation of the cylinder.
The interrupted gearing advantageously consists of a wheel or its equivalent
provided alternately with teeth or cogs and convex smooth surfaces, and a second
toothed-wheel meshing with the teeth of the first and provided with concave
projections corresponding to the smooth surfaces of the first.
The holders or supports for the cam-shaft or shafts are movable and laterally
adjustable within the recesses.
To enable my invention to be fully understood I will describe how it can be
carried into practice by reference to the accompanying drawings,
Figure 1 is a longitudinal sectional view in which A. is the form-holder; B the
fixed printing-surface; C the movable stereotype; E the reinforcing-plate: Fa
projection from the reinforcing-plate designed to engage with the cam; G the cam
beneath the reinforcing-plate; D the shaft to which the cam is attached;
L, K, J the train of gearing by which the shaft is rotated; b the adjustable
bearing of the shaft.

page_text: Figure 2 is an end view shewing the operation of the system of gear-
wheels L, K, J.
Figure 3 is a cross-sectional view shewing the operation of the style of cam
shewn in Figure 1. N is the coloured-ink rolier, M the black ink roller, and O the
paper.
Figure 4 is a longitudinal sectional view shewing how the shaft may pass directly
through a projection from the reinforcing-plate and the cam work within instead of
beneath it.
Figure 5 is a cross-sectional view of the style of cam and reinforcing-plate shewn
in Figure 4.
Figure 6 shews another modification of the style of cam and reinforcing-plate.
Corresponding parts are designated by the same letters.
In Figures 4 and 5, FI and G¹ represent, respectively, the projection from the
reinforcing-plate and the cam, the exponents being used to indicate the modified
construction. For the same reason these parts in Figure 6 are designated by F’
and G.
The shafts D may be of any number and operate in longitudinal recesses a cut
in the form-holder and are supported by laterally-adjustable bearings b. They are
also fitted with laterally-adjustable cams G, which may be of various styles to
conform to different shapes of the movable printing-surface hereinafter described.
For example, the cam G in Figures 1 and 3 has a groove in its side in which the
hook-shaped projection F of the reinforcing-plate forming part of the movable
printing-surface works. It is manifest that when the cam is operated by means of
the rotation of the shaft D the movable printing-surface composed of the stereo-
type C, the reinforcing-plate E, and the projection F will be raised and lowered
according to the position of the cam. If the shaft be passed through the centre
of G, the groove must be cam-shaped; but, if, as shewn, the shaft is passed
through outside the centre the groove can be circular.
Gin Figure 6 has the groove cut in its edge instead of its side, and the
projection from the printing-surface working in it is stud-shaped, with its head
confined in such groove.
The cam Gin Figure 1 can be disengaged from the projection F by opening the
stop and pushing the shaft D.
In Figures 4 and 5 the projection F from the reinforcing-plate forming part of
the movable printing-surface corresponds to a recess cut in the form-holder, and
the shaft bearing the cam G passes through it. Such cams or cam-grooves are so
shaped as to produce, when they revolve, the required elevation and depression of
the movable printing-surface with reference to the fixed printing-surface, to enable
the former to be inked independently of the latter, and then to be brought level
with it when the paper to be printed is reached. These three positions of
surface C, viz., above, below, and level with surface B are made continuing by the
arrangement of the interrupted gear-wheels L, I, J, (shewn in Figure 2) by which
the shaft D is intermittently rotated. Gear L is attached to the end of the
shaft D. Fixed to the side frame of the machine is a stationary interrupted
gearing J, having plain surfaces j opposite the points, where surface is to be
held in a continuing position.. Gear L is connected with gearing J by the gear-
wheel on a stud fixed in the end of the form-cylinder, which is fitted with
projections & in front or behind its cogs corresponding with the plain surfaces j and
shaped so as to slide over surfaces j. The result is that as the cylinder rotates
the shaft will be rotated, when gear K engages with the toothed portions of
gearing J, but will be firmly held in one position when the projections & come to
the plain surfaces j. To prevent pinching at the moment of engagement, j should
be a flange on the wheel J, only extending along the blank space between the
toothed portions. The same results can be obtained in a bed-plate press, the place
of gear J being taken by a track with alternate toothed and smooth portions.
Substantially the same result may be accomplished by omitting gear K, increasing
the size of gear-wheel J, and placing the projections k on gear L.

page_text: More than one shaft and more than one cam on each shaft may be used to
operate a single movable printing-surface. The number of shafts and cams will
naturally depend on the size of such surface. In ordinary cases two shafts, as
shewn in Figure 3, with two cams on each shaft, as shewn in Figure 4, will be found
sufficient to hold it firmly and produce an accurate rise and fall.
Having now particularly described and ascertained the nature of the inven-
tion and in what manner the same is to be performed, I declare that what I
claim as new is the following, using, unless otherwise specified, the expression
"movable printing-surface" to signify not only the parts C, E and F taken together,
which here make up the movable printing-plate, but also electrotype-moulds, type-
forms, cuts, engravings, &c., which are equally capable of being used in connection
with the other elements of my invention :-
1
1. In a printing-machine the combination of a fixed printing-surface with a
movable printing-surface and a rotary cam or cams beneath the latter, such cam or
cams being so shaped with reference to the movable printing-surface as to hold it
firmly and depress as well as elevatė it.
2. A system of interrupted gearing such as herein shewn, in combination with a
shaft or shafts bearing a cam or cams rotated intermittently by such gearing, and
one or more movable printing-surfaces successively raised, lowered, and held fast
by said cam or cams through the intermittent rotation of such shaft or shafts, as
and for the purposes, described.
3. In a printing-machine, the combination with a form-cylinder having longi-
tudinal recesses, of a printing-surface supported on said cylinder by shafts
rotated in said recesses by the rotation of said cylinder, as and for the purposes
described.
4. In a printing-machine, the combination, with a form-cylinder provided with
longitudinal recesses, of a fixed printing-surface and one or more relatively movable
printing-surfaces supported and held upon said form-cylinder by one or more shafts
rotating in said recesses and one or more cams attached to said shaft or shafts and
working within or beneath the movable printing-surfaces, by which combination the
rotation of such shaft or shafts will elevate and depress said movable printing-
surfaces.
5. In a printing-machine, the combination of a form-holder provided with
longitudinal recesses, a fixed printing-surface, a relatively-inovable printing-surface,
and a rotating shaft or shafts in such recesses for operating the movable printing-
surface, as and for the purposes described.
6. In a printing-machine, the combination of a plurality of printing-surfaces
arranged across a form-holder, means, substantially as described, for imparting
motion to a part of said surfaces, and a form-holder having longitudinal recesses
through which and beneath the stationary surfaces said means operate on the
movable surfaces, as shewn and described.
7. In a printing-machine, the combination of a movable printing-surface, together
with a form-holder provided with recesses across its surface, together with a shaft
. or shafts bearing a cam or cams rotating within such recesses for the purpose of
operating the movable printing-surface.
8. In a printing-machine, the combination of a wheel or its equivalent provided
alternately with teeth or cogs and convex smooth surfaces, and a second toothed
wheel meshing with the teeth of the first and provided with concave projections
corresponding to the smooth surfaces of the first, together with a shaft working in
a recess of the form-holder, as and for the purposes described.
9. In a printing-machine, the combination of a form-holder having recesses
across its surface, together with a shaft or shafts rotating within said recesses,
together with holders or supports for said shaft or shafts movable and laterally
adjustable within said recesses.
10. In a printing-machine, the combination of a movable printing-surface,
together with a rotating-shaft, together with a system of interrupted gearing shaped

page_text: and arranged to produce an intermittent rotation of the said shaft, together with a
cam fitted on the shaft and holding the printing-surface, the whole so shaped and
arranged as to intermittently raise and withdraw the printing-surface, substantially
as described.
Dated this 10th day of November 1899
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.