Improvements in Guillotine Paper Cutting Machines.
Year: 1890

page_text: Date of Application, 27th June, 1890
Complete Specification Left, 25th Mar., 1891-Accepted, 25th Apr., 1391
PROVISIONAL SPECIFICATION.
Improvements in Guillotine Paper Cutting Machines.
We, HORTON HARRILD, Junior, of the Firm of Harrild and Sons, of Fleet
Works, Farringdon Street, in the City of London, Printing Machine Manu-
facturers, and JOHN FREDERICK BUCKLAND, of the same place, Engineer, do
hereby declare the nature of this invention to be as follows:-
This invention has reference to guillotine paper cutting machines such as are
used for trimming the edges of folded newspapers, pamphlets or books.
In these machines as ordinarily constructed the operation of changing the
guillotine knife or cutter is slow and tedious. The knife is secured in a longi-
tudinal recess in the knife carriage by means of a number of bevelled pieces
forming the heads of screws. The screws are passed through the carriage and are
secured by nuts at the opposite side of same, the bevelled pieces fitting into corre-
sponding bevelled apertures in the knife. When it is desired to change the knife
all these bevelled pieces with their screws have first to be removed and in order to
effect this the knife (and consequently other parts of the machine) has to be moved
into several positions successively because the bevelled pieces and nuts cannot all
be got at in one position of the knife. Wooden blocks or bars have also to be
inserted under the knife to hold it up and there is besides some risk of danger to
the operator. When all the bevelled pieces have been removed the knife is slid
out endways at the side of the machine. The knife having been removed the same
operations, but reversed, have to be gone through in order to fix the fresh knife in
position. All this occupies so much time that a person often prefers to use a blunt
knife and produce inferior work rather than incur the delay that would be caused
by changing the knife.
Now the object of this invention is to fix the knife in such manner that it can be
readily changed in a very short time. For this purpose instead of a number of
bevelled pieces one longitudinal bevelled piece is employed; it fits into a corre-
sponding longitudinal dovetailed recess in the knife and carries three or other small
number of screws whose heads are countersunk in the bevelled piece while their
shanks pass through the knife carriage and are screwed up tight by means of nuts
so that the knife is drawn up tightly against the carriage. When it is required to
change the knife the nuts have simply to be loosened and then the knife is slid out
at the side of the machine, the longitudinal bevelled piece remaining. The fresh
knife is then slid into place and the nuts again tightened. In carrying out the
invention the knife should be made thicker than usual to allow of the formation
of the dovetailed recess therein and the knife carriage should be recessed more
deeply to correspond.
Dated this 27th day of June 190n
J. C. MEWBURN,
55 & 56, Chancery Lane, London, Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Guillotine Paper Cutting Machines.
We, HORTON HARRILD, Junior, of the Firm of Harrild and Sons, of Fleet
Works, Farringdon Street, in the City of London, Printing Machine Manu-
facturers, and JOHN FREDERICK BUCKLAND, of the same place, Engineer, do
hereby declare the nature of this invention, and in what manner the same is to
LD

page_text: be performed, to be particularly described and ascertained in and by the following
statement:-
In guillotine paper cutting machines as ordinarily constructed the operation of
changing the guillotine knife or cutter is slow and tedious. The knife is secured in
a longitudinal recess in the knife carriage by means of a number of bevelled pieces
forming the heads of screws. The screws are passed through the carriage and are
secured by nuts at the opposite side of same, the bevelled pieces fitting into corre-
sponding bevelled apertures in the knife. When it is desired to change the knife
all these bevelled pieces with their screws have first to be removed and in order to
effect this the knife (and consequently other parts of the machine) has to be moved
into several positions successively because the bevelled pieces and nuts cannot all be
got at in one position of the knife. Wooden blocks or bars have also to be inserted
under the knife to hold it up and there is besides some risk of danger to the
operator. When all the bevelled pieces have been removed the knife is slid out
endways at the side of the machine. The knife having been removed the same
operations but reversed have to be gone through in order to fix the fresh knife in
position. All this occupies so much time that a person often prefers to use a blunt
knife and produce inferior work rather than incur the delay that would be caused
by changing the knife.
Now the object of this invention is to fix the knife in such manner that it can be
readily changed in a very short time while its rigidity is not interfered with. For
this purpose instead of a number of bevelled pieces one longitudinal bevelled piece
is employed; it fits into a corresponding longitudinal dovetailed recess in the
knife and carries four or other small number of screws which are fixed in the
bevelled piece their shanks passing through the knife carriage and being screwed
up tight by means of nuts so that the knife is drawn up tightly against the carriage.
When it is required to change the knife the nuts have simply to be loosened and
then the knife is slid out at the side of the machine the longitudinal bevelled piece
remaining. The fresh knife is then slid into place and the nuts again tightened.
In carrying out the invention the knife should be made thicker than usual to allow
of the formation of the dovetailed recess therein and the knife carriage should be
recessed more deeply to correspond.
The annexed drawings will serve to illustrate the invention. Figure 1 being a
face view of the knife and knife carriage, and Figure 2 a section on a larger scale
on the line x-x of Figure 1.
a is the knife and 6 the knife carriage. c is the longitudinal bevelled piece and
d the longitudinal dovetailed recess in the knife into which the said piece fits.
e, e, e, e are screws which are screwed into the bevelled piece c and fixed by pins g;
their shanks pass through the knife carriage and they are screwed up tight by
means of nuts so that the knife is drawn up tightly against the carriage as seen
in Figure 2. By simply loosening the nuts the knife can be slid out at the side
of the machine the piece c remaining.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
Fixing the knife or cutter of guillotine paper cutting machines substantially as
hereinbefore described.