and Apparatus therefor.
Year: 1885

page_text: and Apparatus therefor.
I ALFRED JULIUS BOULT of 323 High Holborn in the county of Middlesex,
Engineer do hereby declare the nature of this invention (a communication from
George James Bellamy Rodwell, of Toronto Canada,) 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 the invention is to devise means by which names, business devices,
and ornamentations may be imprinted on the surface of steel or other metal with
rapidity and accuracy, and it consists, essentially, in preparing as hereinafter
described a surface of vulcanised rubber or like material so that the business
letters, devices, and ornamentations, shall be sunk below the main surface, the said
prepared surface being placed on a roller and manipulated substantially as and for
the purpose hereinafter more fully explained.
Figure 1 exhibits a sheet of vulcanised rubber, having printed on its surface a
device, which is designed to be imprinted on a steel saw blade.
Figure 2 is a perspective view of a cylinder or roller, around which the prepared
rubber sheet, shown in Figure 1, is fixed, the said roller being journalled in a
suitable frame.
Figure 3 is a perspective view, representing this imprinting device being operated
over the surface of a saw blade.
As this device is specially designed to be used by saw-makers, it will assist
towards the understanding of the invention if I first explain briefly the plan now
generally adopted by saw-makers, of imprinting on the surface of their saws
business devices or fancy configurations for the purpose of ornamentation.
Under this plan the device to be printed on the saw-blade is first engraved on
a rubber plate. This plate is then covered with prepared ink, on which is laid a
sheet of tissue or other thin paper. The rubber plate with the sheet of paper laid
on top of it is then run between rollers or put in a copying press, when the sheet
of paper is removed from the rubber plate and placed on the surface where it is
intended the device shall be imprinted. The sheet of paper is allowed to remain
on the surface of the saw until the ink has hardened sufficiently to adhere thereto,

page_text: when the top surface of the thin paper is dampened sufficiently to allow it to be
torn off, so as to leave the ink on the blade of the saw. This operation occupies &
considerable time, and the ink will naturally be torn off while removing the paper,
consequently the impression is not perfect and requires to be carefully gone over
with a brush or pencil so as to cover the imperfect spots. This leaves a surface of
ink, with the letters or devices to be imprinted, exposed, or in other words, the
surface of the saw-blade is exposed, while the balance of the surface is covered by
the ink, which is impervious to acid, while the clean surface of the saw will be
acted upon when the acid is placed on it.
In this improved process on the sheet A, the letters or other devices to be
imprinted are vulcanized. This sheet A, is then fitted round and attached to the
roller, B, which is suitably journalled in the frame C, which frame has a handle D,
and a box-shaped top E, designed to receive and carry a weight for the purpose
hereinafter more fully explained.
The sheet A thus fixed onto the roller B, is then covered with prepared printers
ink. The roller B is then run over the saw-blade For other surface on which the
device is to be imprinted, until the said surface is completely covered with the ink,
the roller being carefully manipulated, so that in passing to and fro, it will pass
over the same portion of the surface at each revolution or portion thereof. This
action will cover the surface of the plate, F, with the ink, except at such points
where the sheet A, has cut into it the letters or other devices vulcanised in it as
before explained. The surface thus covered with the prepared ink has then
sprinkled on it finely powdered resin, which causes the ink to harden quickly,
so as to enable the acid to be applied without any appreciable delay, although it is
thought preferable to place a sbeet A onto a cylinder or as it is termed, a roller, it
would be possible to effect this purpose by fixing it to a semi-circular or rounded
block.
It may also be mentioned that while there may be various ways of preparing the
printers ink to be used in connection with this invention, it is found preferable to
add to ordinary printers ink, boiled linseed oil, in the proportion of one part of oil
to nine parts of ink, and boiling the same till it becomes about the consistency of
ordinary liquid cement or glue. The ink thus prepared will readily absorb the
powdered resin and will consequently dry quicker than if no oil or other absorbent.
was mixed with the ink.
The box shaped top E as before mentioned, is designed to receive and carry a
weight, so that the roller, B, may be made to press evenly and regularly on the
surface being prepared, instead of leaving the said pressure to be operated by the
hands of the manipulator.
With the view of balancing the roller B, and also with the view of preventing
the said roller from pressing too heavily on the surface being prepared, at each end
of the roller B is placed an adjustable roller C, which may be set so as to come in
contact with the surface over which the roller is being run, so that the said roller
shall not press too heavily on the surface.
It is also important to load or weight one side of the roller B, so that in
commencing to use the roller the same point in the surface of the roller shall
always be at the bottom. By thus loading one side of the roller the same point in
the roller will always be first brought in contact with the surface to be covered.
As a further precaution to secure accuracy in rolling the design a track may be
provided into which the roller, G, may be arranged to run or against which the
Toller B may be brought.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is
1. A roller covered with rubber or other elastic material, having letters,
numerals, or fancy designs sunk below its surface, which surface is covered with
printers ink prepared substantially as described.

page_text: 2. A roller covered with rubber or other elastic material, having letters,
numerals, or fancy designs sunk below its surface, which surface is covered with
printers ink prepared substantially as described, the said roller being journalled in
a frame provided with a handle and having a receptacle to receive a weight,
substantially as and for the purpose specified.
3. A roller covered with rubber or other elastic material, having letters,
numerals, or fancy designs sunk below its surface, which surface is covered with
printera ink prepared substantially as described, the said roller being journalled in
a frame provided with a handle, and having a receptacle to receive a weight in
combination with an adjustable friction roller G, arranged substantially as and for
the purpose specified.
4. As an improved process for imprinting on steel or other metal, letters,
numerals, or fancy designs, the imprinting on the surface of the metal by
transferring prepared ink on the surface of the metal, substantially in the manner
specified, and sprinkling on the said inked surface powdered resin preparatory
to covering the said surface with acid, substantially as and for the purpose
specified.
5. A roller covered with rubber or other elastic material, having letters,
numerals, or fancy designs sunk below its surface, and having one side loaded or
weighted substantially as and for the purpose specified.
6. A roller covered with rubber or other elastic material, having letters,
numerals or fancy designs sunk below its surface, in combination with a track or
guide, substantially as and for the purpose specified.
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