Improvements in Rotary Cutting Machines for Cardboard, Paper, and the like.
Year: 1898

page_text: Date of Application, 18th Nov., 1898
Complete Specification Left, 16th Aug., 1899-Accepted, 23rd Sept., 1899
PROVISIONAL SPECIFICATION.
Improvements in Rotary Cutting Machines for Cardboard, Paper,
and the like.
ALBERT HUGH STEVENSON, Boxmaker, 62, 64, and 66, Ogden Street, Ardwick,
Manchester, do hereby declare the nature of this invention to be as follows:-
-
In cutting up cardboard, paper, and the like on rotary cutting machines, it is
often advisable that the sheet shall not be completely severed, but shall be so far
cut through that it can be easily broken into pieces. Thus a sheet only partially
severed can be fed into the machine a second time at one operation, whereas if it
were completely cut through, each severed part would have to be fed separately.
To accomplish this it is now customary to use circular cutters, which cut direct
upon a solid roller, and which may be regulated so that they do not cut com-
pletely through the material. This method has several disadvantages; for
example, it requires great accuracy in setting the cutters; it is liable to wear
away the rollers and cutters; it does not produce a clean cut, and when the card-
board is lined with a strong paper it is difficult to separate the cut pieces.
The object of my patent is to dispense with the system of cutting direct on to
the rollers, and to accomplish the desired partial severing of the sheet by an in-
proved process. With this object I employ the double circular shears, well known
in rotary cutting machines, and which cut against each other, producing a
perfectly clean cut, but in order that the sheet may not be completely severed,
I make one or more slots or niches of suitable depth in one or both of the circular
shears, thus in fact producing an imperfection in the cutting edge. It therefore
follows that the sheet is completely severed and a clean cut produced except where
the "imperfection" of the cutting edge occurs, where a small portion of card-
board is unsevered, and serves to connect the cut portions into one whole sheet.
My invention is peculiarly suitable to those machines known as duplex rotary
cutting machines, though it can also be employed for the ordinary single machines.
Dated this 14th day of November 1898.
COMPLETE SPECIFICATION.
Improvements in Rotary Cutting Machines for Cardboard, Paper,
and the like.
I, ALBERT HUGH STEVENSON, of Hugh Stevenson and Sons, Limited, formerly
of 62, Ogden Street, Ardwick, Manchester, but now of Victoria Mills, Pollard
Street, Manchester, in the County of Lancaster, Fancy Box Manufacturer, 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:
-
In cutting up cardboard, paper, and the like on rotary cutting machines, it is
often advisable that the sheet shall not be completely severed, but shall be so far
cut through that it can be easily broken into pieces. Thus a sheet only partially
severed can ho fed into the machine a second time at one operation, whereas if it

page_text: '
were completely cut through, each severed part would have to be fed separately.
To accomplish this it is now customary to use circular cutters, which cut direct
upon a solid roller, and which may be regulated so that they do not cut com-
pletely through the material. This method has several disadvantages for
example, it requires great accuracy in setting the cutters; it is liable to wear
away the rollers and cutters; it does not produce a clean cut; and when card-
board is lined with a strong paper it is difficult to separate the cut pieces.
The object of my-invention is to dispense with the system of cutting direct on
to a roller and to accomplish this object I employ the double circular shears well
known in rotary cutting machines and which cut against each other producing a
perfectly clean cut; but in order that the sheet shall not be completely severed,
I make a slot or any suitable number of slots or niches of suitable depth
in the cutting edges of one or both of the circular shears, thus in fact producing
a fault or imperfection in the cutting edge. It therefore follows that the sheet
is completely severed and a clean cut produced except where the fault in the
cutting edge occurs, where a small portion of cardboard is left unsevered, and
serves to connect the cut portions into one whole sheet.
The accompanying sheet of drawings illustrates so much of a rotary cutting
machine as is necessary to enable my invention to be understood.
Fig. 1 is a sectional end view of the two cutter shafts of a rotary cutting
machine fitted in suitable bearings and upon each of these shafts is mounted a
rotary cutter made according to my invention.
Fig. 2 is a side view of part of Fig. 1.
Figs. 3 and 4 illustrate alternative constructions and arrangements of cutters
for the purposes of my invention.
In the arrangement illustrated by Figures 1 and 2 the rotary cutter shafts 1
are shown journalled in bearings in a pedestal 2 carried on the table or bed-
plate 3 of a rotary cutting machine.
On each sliaft Ĭ is secured a cutter 4 each of which is made according to my
invention with two slots or notches 5.
The shafts 1 are rotated and the cutters 4 act like shears one against the other
in the usual way well understood, and where the cutting edges are unbroken the
cardboard (not shown) is cut clean through but where the slots 5 come opposite
to each other the cardboard passes between the cutters untouched thus leaving a
series of uncut parts which serve as links to connect the otherwise severed por-
tions of the cardboard sheets together.
In Figure 3 only one of the cutters 4 has a slot.5 and consequently the cardboard
will be completely severed except at one point during each rotation, and at this
point it will be left uncut or only partially cut through.
In Figure 4 both cutters 4 have a single slot 5 and the cardboard therefore
is left uncut or only partially severed at two points in each complete revolution.
It is obvious that the cutters may have any required number of slots in any
desired combination.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
In combination, pairs of rotary circular shears or cutters having cutting edges
provided with any required number of notches and at any suitable intervals
substantially as and for the purposes herein set forth.
DL: 15th to of Anament 1900
H. B. BARLOW & GILLETT,
Agents for Applicant, 17, St. Ann's Square, Manchester.