AN IMPROVEMENT APPLIED TO THE BLADES OR KNIVES OF MACHINES FOR SHAVING AND OTHERWISE TREATING HIDES AND SKINS
Year: 1876

page_text: LETTERS PATENT to John William Janson, of St. Mary Axe, in the City of
London, Merchant, for the Invention of "AN IMPROVEMENT APPLIED TO THE
BLADES OR KNIVES OF MACHINES FOR SHAVING AND OTHERWISE TREATING
HIDES AND SKINS." A communication from abroad by V. Gallien, of
Longjumeau (Seine et Oise), France."
Sealed the 15th May 1877, and dated the 22nd November 1876.
PROVISIONAL SPECIFICATION left by the said John William Janson at
the Office of the Commissioners of Patents on the 22nd November 1876.
JOHN WILLIAM JANSON, of St. Mary Axe, in the City of London, Merchant.
"AN IMPROVEMENT APPLIED TO THE BLADES OR KNIVES OF MACHINES FOR
SHAVING AND OTHERWISE TREATING HIDES AND SKINS." A. communication from
abroad by V. Gallien, of Longjumeau (Seine et Oise), France.
The object of this Invention is to give such an edge to the knives or blades carried
on revolving cylinders in machinery for shaving and otherwise treating hides and
skins that there may be little danger of making too deep a cut into the hide or skin,
that the work may be done more efficiently than hitherto, and that the edge may
be renewed with great facility. For this purpose an edge is given to these cylinder
blades similar to that used on the ordinary curriers' or "Beamsman's" shaving knife,
that is to say, that the edge is slightly beveled and in the beveling a very thin
feather or cutting edge is formed by the thread or turnover of the metal.
This
thread or cutting edge may be constantly renewed by simply reversing the
movement of the cylinder and bringing the blades into contact with a steel plate
throwing up the feather or thread, which is then adjusted by the ordinary tool or
"steel."

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John William Janson in the Great Seal Patent Office on the 21st
May 1877.
JOHN WILLIAM JANSON, of St. Mary Axe, in the City of London, Merchant.
"AN IMPROVEMENT APPLIED TO THE BLADES OR KNIVES OF MACHINES FOR
SHAVING AND OTHERWISE TREATING HIDES AND SKINS." A communication from
abroad by V. Gallien, of Longjunenu (Seine et Oise), France.
The object of this Invention is to give such an edge to the knives or blades carried
on revolving cylinders in machinery for shaving and otherwise treating hides and
skins that there may be little danger of making too deep a cut into the hide or skin,
that the work may be done more efficiently than hitherto, and that the edge may
be renewed with great facility. For these purposes an edge is given to these
cylinder blades similar to that used on the ordinary curriers' or Beamsman's shaving
knife, that is to say, that the edge is slightly beveled, and in the beveling a very
thin feather or "burred" cutting edge is formed by the thread or turnover of the
metal. This thread or "burred" cutting edge may be constantly renewed by simply
reversing the movement of the cylinder and bringing the blades into contact with
an emery plate, filo, or other sharpener throwing up the feather or thread, which is
then adjusted by the ordinary tool or steel.
Upon the accompanying Sheet of Drawings,-
Figure 1 represents a front view of a portion of a knife blade drawn to an enlarged
scale; Figure 2 is an end view of same, also enlarged.
Figure 3 is an elevation of a cylinder or drum as seen from the back, and illustrates
the manner in which the knives may be re-cut or ground, that is to say, the
"burred" edge renewed; and Figure 4 is an end view of same.
A indicates the blade of the knife; B is the face or beveled portion of same; C,
the "burr" or raised edge for cutting; D, a cylinder or drum upon which the
knives A, A, are secured and preferably sot to form right and left handed spirals, as
for example, in what is known as the "Molinier" machine; E, table bolted on to
side frames of machine; F, slide rest; G, block of emery, or its equivalent, for
renewing cutting edge of knives; H, side frames of machine.
Having now described and ascertained the nature of the Invention communicated
to me as aforesaid, and in what manner the same is or may be performed, I desire it
to be understood that this Invention does not consist in the production of the "burr"
or feather edge, such edge being as above set forth already in use, but what I claim
as the Invention secured to me by the herein-before in part recited Letters Patent,
is the application of the "burred" or feather edge hereiu-before described and
illustrated on the accompanying Sheet of Drawing, to the continuous spiral blades
or knives set on revolving cylinders in machines for shaving and otherwise treating
hides and skins.
In witness whereof, I, the said John William Janson, have hereunto set
my hand and seal, this Eighteenth day of May, in the year of our Lord
One thousand eight hundred and seventy-soven,