IMPROVEMENTS IN APPARATUS FOR CUTTING PAPER WEBS INTO SHEETS PRINCIPALLY APPLICABLE TO NEWSPAPER PRINTING MACHINES to be as follows:
Year: 1884

page_text: I HENRY GRAFTON of Cannon Street in the City of London, do hereby declare
the nature of the said invention for "IMPROVEMENTS IN APPARATUS FOR CUTTING
PAPER WEBS INTO SHEETS PRINCIPALLY APPLICABLE TO NEWSPAPER PRINTING
MACHINES to be as follows:-
"
My Invention relates to cutting apparatus such as used in newspaper printing
machines for perforating the paper web transversely previous to severing it.
Such apparatus usually consists of a pair of cylinders, of which one is furnished
with a longitudinal serrated knife and the other with a groove to receive the points
of the knife.
The object of my Invention is to provide a bed to support the paper under the
pressure of the serrated knife in order to ensure its being uniformly perforated and
at same time prevent the paper being forced by the knife into the groove which is
liable to cause the paper to be cut unequally.
My Invention consists in forming a die or bed exactly corresponding to the
serrations or certain of the serrations or cutting edges of the knife but of a
sufficiently greater width than the thickness of the knife to allow of the angular
motion of the knife in entering and leaving the serrations of the said die or bed,
which may be contained in a groove or be otherwise arranged and either fixed
rigidly or upon an elastic or yielding support.
My Invention is not confined to knives and beds or dies mounted on cylinders,
but may be applied to other forms of moving or stationary supports according to
the kind of machine and the motion of the paper.

page_text: I HENRY GRAFTON of Cannon street in the City of London do hereby declare
the nature of the said invention for "IMPROVEMENTS IN APPARATUS FOR CUTTING
PAPER WEBS INTO SHEETS PRINCIPALLY APPLICABLE TO NEWSPAPER PRINTING
MACHINES and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
"
My Invention relates to cutting apparatus such as used in newspaper printing
machines for perforating or slitting the paper web transversely previous to
severing it.
Such apparatus usually consists of a pair of cylinders, of which one is furnished
with a longitudinal serrated knife and the other with a groove to receive the
points of the knife.
The object of my Invention is to provide a bed to support the paper under the
pressure of the serrated knife in order to ensure its being uniformly perforated and
at same time prevent the paper being forced by the knife into the groove which is
liable to cause the paper to be cut unequally.
My Invention consists in a die or bed corresponding to the serrations or certain
of the serrations of the knife but of a sufficiently greater width than the thickness
of the knife to allow of the angular motion of the knife in entering and leaving the
said die or bed, which may be contained in a groove or be otherwise arranged and
either fixed rigidly or upon an elastic or yielding support.
My Invention is not confined to knives and beds or dies mounted on cylinders,
but may be applied to other forms of supports according to the kind of machine
and the motion of the paper.
Reference is to be had to the accompanying drawings forming part of this
specification, wherein
Figure 1 is a cross section of the portion of the pair of cylinders containing the
knife and its die or bed. Figure 2 is a longitudinal sectional elevation with one
of the lateral strips removed showing two alternative forms of tooth for the kuife.
These drawings show the preferred mode of arranging the bed but I do not limit
myself thereto as it may be otherwise arranged.
A is the knife cylinder and B the bed cylinder, C is the knife fixed in a
longitudinal groove of the cylinder A, in the usual or any other suitable manner
the teeth of the knife being either of the form shown at c or of the form shown
at c¹.
The die or bed is formed of a central strip D and two lateral strips E of metal or
other hard material such as vulcanite, or hard wood.
The operating face of the strip D is formed with transverse salient edges d
preferably of V section corresponding in pitch to the re-entering angles (or certain
of them) between the teeth of the knife, the recesses between these edges being
either of the same form as the teeth of the knife as shown, or of any other form
and of a depth to allow the teeth to enter them. These salient edges d are
preferably flush with the surfaces of the side strips E so that the paper is supported
at each side of the knife, as well as between the teeth and the three strips are
screwed together and fixed in a groove of the cylinder B by any suitable means or
otherwise supported in position to meet the knife. At the left end of figure 2
I have shown each tooth of the knife entering a recess of the bed and at the right
end I have shown double teeth, each double tooth entering one recess, which does
not in this case correspond to the outline of the tooth. I do not limit myself to a
narrow bed as herein shown but may extend the width of the bed through any arc

page_text: of the circumference of the cylinder desired, or I may extend the bed around the
entire circumference of the cylinder B by turning V or other grooves around the
cylinder to form the salient edges d in which case the cylinder B may be of a
different diameter to the cylinder A.
Having now particularly described and ascertained the nature of the said
Invention, and in what manner the same is to be performed I declare that what
I claim is
1 In a cutting apparatus for perforating or slitting a paper web, the combination
with a serrated knife of a die or bed constructed with salient edges standing
transversely to the plane of the knife and corresponding to the re-entering angles
between the teeth of the knife or to certain of them, for the purpose of supporting
the paper against the pressure of the knife substantially as herein specified.
2nd In a cutting apparatus for perforating or slitting a paper web the combination
with a serrated knife of a die or bed constructed with recesses corresponding in
pitch to the teeth of the knife (or certain of them) said recesses being separated at
their adjacent sides by narrow edges adapted to enter the re-entering angles between
the teeth of the knife and being of such a width only, as to allow the teeth to enter
and leave them without touching the bed, so as to support the paper between the
teeth and on each side of the knife substantially as shewn and described.
HENRY GRAFTON.
By his Agents,
A. M. & W
Clark,
53, Chancery Lane, W.C.