Year: 1887

page_text: Date of Application, 29th July, 1887
Complete Left, 20th Apr., 1888
Complete Accepted, 25th May, 1888
I, ERNEST DE PASS, of 68 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in machines for cutting paper, either in a
straight or in an oblique direction.
These improvements consist in a novel mechanism for actuating the oscillating knife,
such mechanism ensuring a proper working of the machine, whatever may be the
inclination given to the said knife relatively to a fixed knife.
In carrying out the invention, a moveable knife is provided which oscillates in
front of a fixed knife while at the same time rotating upon an axis. This axis and the
two knives may rotate together about a common centre, so as to assume the necessary
inclinations for oblique cutting of the paper, particularly for the preparation of paper
for envelopes.
According to one arrangement, and a modification thereof, the invention bears upon
the following points. The knife oscillating upon an axis is carried at the extremity
of a lever or beam, to the other extremity of which is imparted an oscillating
motion by a cam mounted upon the motor shaft. The angular displacement of the
axis has for its object to vary the normal distance between such axis and the point
of action of the cam. In both arrangements there is a sliding motion allowing the
oscillating knife to be operated without it being necessary to modify the actuating
mechanism by reason of the inclination.
In the first arrangement the extremity of the lever opposite the knife slides in a
sleeve rotating upon a knee joint, and in the second, or modified arrangement, the
same extremity of the lever slides upon a guide carried by a hoop or frame within
which acts the cam, whatever may be the inclination of the axis. This hoop or frame
turns in a circular guide when the axis assumes an oblique direction.

page_text: COMPLETE SPECIFICATION.
Improvements in Paper Cutting Machines.
I, ERNEST DE PASS, of 68 Fleet Street, in the City of London, Fellow of the
Institute of Patent Agents, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement (reference being had to the accompanying drawings
and to the letters and figures marked thereon) that is to say :-
This invention relates to improvements in machines for cutting paper, either in a
straight or in an oblique direction.
These improvements consist in a novel mechanism for actuating the oscillating knife,
such mechanism ensuring a proper working of the machine, whatever may be the
inclination given to the knives (fixed knife and oscillating knife).
The movable knife D oscillates in front of a fixed knife E, while at the same time
rotating upon an axis P.
This axis P, and the two knives, may rotate around the centre O, so as to assume
the necessary inclinations for oblique cutting of the paper, particularly for the
preparation of paper for envelopes.
In the accompanying drawings, figs. 1 and 2 represent one arrangement of the
invention, Figs. 3, 4 and 5 .represent a slightly modified arrangement of the same
invention.
This invention bears upon the following points :-
In both these arrangements, shewn by way of example, the knife oscillating about
the axis P is carried at the extremity of a lever or beam which, at its other extremity,
receives an oscillating motion by means of a cam B mounted upon the motor shaft A.
The angular displacement of the shaft P has for its object to vary the normal distance
between this shaft P and the point of action of the cam B. In both the arrangements
shewn there is a sliding motion allowing the oscillating knife to be operated without
it being necessary to modify the actuating mechanism by reason of the inclination.
In the arrangement shewn in fig. 1, the extremity of the lever opposite the knife
slides in a sleeve rotating upon a ball and socket joint B; in the arrangement shewn
in figs. 3, 4, and 5, the same extremity of this lever slides upon a guide carried by
a stirrup or frame within which acts the cam, whatever may be the inclination of the
shaft P. This stirrup or frame H turns in a circular guide O when the shaft P
assumes an oblique direction.
D', E', represent the position of the knife acting obliquely on the paper. O is the
lever to which the eccentric gives an alternating movement. F, G, shew driving
means by the connecting-rod and crank plate giving the movement to the cam B.
L is a lever fixed on the shaft P, and arranged vertically above the lever C for
lengthwise cutting. It assumes the position L' shewn in dotted lines for cross cutting.
Qis a counterweight on the moveable knife.

page_text: 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 I claim
as communicated to me by my foreign correspondent:
The combination, in all paper cutting machines, of the novel mechanism for
actuating the oscillating knife for cutting the material either in a straight or in an
oblique direction, substantially as hereinbefore described and as shewn with reference
to the accompanying drawings.