Improvements in Apparatus for use in connection with Printing in Colours.
Year: 1898

page_text: Date of Application, 4th Feb., 1898
Complete Specification Left, 7th Oct., 1898-Accepted, 4th Feb., 1899
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for use in connection with Printing
in Colours.
I, LOUIS CHRISTIAN GÉRARD LESAGE, of 4, Passage de la Visitation, Paris, in
the Republic of France, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
In the specification of former Patent No. 8311 April 20th 1896, I have described
and represented a method of printing in colours effected by the combination of a
table or scale with a machine intended to form and to reproduce it. The present
invention relates to an improvement which I have adapted to my said machine.
This improvement will be readily understood from the following description
with reference to the accompanying drawing which is given by way of example.
In principle, if a rubber is assumed to be rubbing upon the metal plate M
to be stamped, and in communication with the pole P of an electric current, and
the plate in communication with the other pole P¹ of the current; if too, on
the other hand this current is assumed to be actuating a relay R of any suitable
description, which relay either supplies or interrupts the current of the sole-
noid j, then every time that the relay acts the style s will act in unison.
'
If again, it is assumed that the stippling No. 4 for example in the table given
in the said prior specification is to be made upon the plate M, and that all the
portions not intended to be dotted or stippled are covered with a layer of insulat-
ing varnish, the relay R will not make contact except when the rubber F is upon
the non-insulated portion of the metal plate M. When, on the other hand, the
rubber is upon the portions covered with varnish, the relay will not act. The
relayed circuit being the circuit of the stamping style the latter will consequently
not operate except when the relay itself acts.
If the rubber is rendered mechanically integral with the motion of the style,
the style will then indicate in dots the motion of the rubber F upon the non-
insulated metal portion of the plate M and nothing more.
I may, instead of causing the rubber F to travel over the plate to be stippled
itself, cause it to move over an independent plate; I may also cause the relation
between the speed of the rubber and that of the style to vary in such a manner
that, for example when the rubber describes a path expressed by the letter G, the
G
style describes upon the plate to be stippled a path expressed by or a G, and accord-
20
ing to the relation between the speed of the rubber F upon the plate M and that
of the style upon the image plate I, I obtain upon this latter an image which in
size is either equal to greater than or less than that left without insulating var-
nish upon the guide plate M and nothing more.
It is apparent that this arrangement renders my stippling machine a machine
which copies the model automatically, reproducing it upon either a larger, smaller
or similar scale, the desired proportion being readily obtained by merely causing
the relation between the speed of the rubber F and that of the style to vary by
employing one of the known means, such for example as a jointed parallelogram
and so forth.

page_text: By rendering the two motions. (that is to say, the reciprocating motion and the
displacement at right angles to the reciprocating motion) of the style likewise
automatic, I obtain, both for the rubber F and for the style, a displacement upon
their respective plates, which nĩay be compared, for instance, to that of the tool
in a shaping machine.
The two plates being placed in position, as above described, and the machine
being started, I obtain, when the machine has completed its operation, a reproduction
in stippling upon the style plate of all the portions left uncoated upon the plate
of the rubber F, and this without any necessity for directing the machine or even
superintending it in any way throughout the course of the operation.
11.
.
1000.
HASELTINE, LAKE & Co.
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in Apparatus for use in connection with Printing
in Colours.
I, LOUIS CHRISTIAN GÉRARD LESAGE, of 4, Passage de la Visitation, Paris, in
the Republic of France, Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:
The improvement which forms the subject of this invention relates to machines
for printing in colours, for which I obtained a patent on the 20th April 1896
No. 8311, and in which a pen or style is capable of displacement in one direction,
by means of a screw, and of displacement in a direction at right angles to the
first by means of a movement of advancement imparted to the machine. This
style executed a certain stippling according to a scale of tones," by means of its
.elevation and depression upon three different plates for example, and these plates
after being inked one with blue, one with red, and one with yellow and three
superposed impressions, give a composite tone, the elements of which for each
of the three parent colours or any other combination has been furnished by the
table of the scale.
The invention will be readily understood from the following description and
reference to the accompanying drawing, in which:
Figure 1 represents, in elevation, a machine of the kind in question provided
with my improvement.
Figure 2 shews a drawing executed by the machine.
i
Figure 3 represents a plate intended to guide the machine in its work.
0
In my original machine, which I have mentioned above, it was necessary to
stop the displacement of the style (Figure 1), mounted upon the solenoid j, by
hand, when this style reached the limits of the contours of the figures being pro-
duced upon the plate p. By means of the the improvement which forms the sub-
ject of this application, this stoppage is effected automatically. In order to
obtain this result. I arrange, at the side of the said machine, a plate M upon
which is displaced a rubber F connected by means of a bar a¹ to a nut b¹ sup-
porting the solenoid j, which the screw h displaces by means of the hand-wheel c¹.
The machine is electrically connected with a source of electricity d¹ and with
a relay R.
The rubber F and the plate M are electrically connected with a battery e¹

page_text: and in this electric circuit is arranged an electro-magnet f1 capable of attracting
the movable bar g¹ of the relay upon the contact g" of the circuit of the battery d¹.
Supposing that it is desired to execute a very simple figure such as a shield
with a ground; upon the plate M (Figure 3) the shield in question is drawn,
but this drawing does not comprise the stippling. The shield is surrounded
with an insulating varnish, in such a manner that the electrical circuit of the
battery el will be formed when the rubber F passes over the image of the shield,
and that it will be interrupted, on the other hand, when the rubber has passed
the limits of the said shield.
When the electric circuit of the battery e¹ is closed, the electro-magnet f¹
attracts the bar gl of the relay and maintains it upon the contact 9", in such a
manner that the electric circuit of the battery is closed.
The style o is then able to mark points upon the plate p, but these points
will cease automatically at the limits of the figure of the shield. Such stoppage
is effected by the opening of the circuit of the battery e¹ which allows the bar g'
of the relay to open the electric circuit of the battery by means of the counter-
spring .
The arrangement is capable of copying from the plate M, either upon the same
scale, or the design may be enlarged or reduced by means of a jointed parallelo-
gram or the like.
The forms, details, accessories, materials and dimensions of the device in
question may of course be varied without thereby in any way altering the prin-
ciple of my invention.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:
The improvements which I have devised in my machines for printing in colours,
characterised by a rubber which is displaced upon a plate M, these two parts
being electrically connected with an electro-magnet f₁ which closes the electric
circuit of the stippling machine, by means of a relay R when the rubber F
passes over the non-insulated portions of the plate M, and on the contrary, opens
the circuit of the said machine when the said rubber passes over the insulated
portions of the plate M, as described above and represented in the accompanying
drawing.
Dated this 13th day of January 1899.
HASELTINE, LAKE & Co.
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.