Improvements in or applicable to the Cutting Devices of Machines for Pasting the Corners of Cardboard Boxes.
Year: 1898

page_text: Date of Application, 24th Aug., 1898-Accepted, 7th Jan., 1899
COMPLETE SPECIFICATION.
Improvements in or applicable to the Cutting Devices of Machines for
Pasting the Corners of Cardboard Boxes.
We, FERDINAND EMIL JAGENBERG, of No. 15B, Reichsstrasse, Dusseldorf on the
Rhine, Germany, Merchant, and BRUNO ROMER, of No. 16E, Stelzendorferstrasse,
Siegmar, Saxony, Germany, Machine Maker, 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: -
The present invention relates to an improved construction of cutting device for
use in machines for pasting the corners of cardboard and the like boxes, its object
being to render more certain the cutting off of the strips which are to be pasted and
to remove certain defects which are inherent in the cutting devices as hitherto
constructed.
In the following description reference is made to the accompanying drawings
in which
Fig. 1 is a sectional elevation of a pasting machine as heretofore constructed,
Fig. 2 is a front view thereof,
Figs. 3 and 4 are respectively longitudinal and cross sections of the cutting off
device hitherto used.
Figs. 5 and 6 are respectively longitudinal section and elevation of a cutting
device made in accordance with our said invention.
Fig. 7 shows the upper and lower cutting tools of our said invention in the act
of cutting.
Fig. 8 is a section of the cutting tools made in accordance with our said invention
at the commencement of the cut.
The defects of the cutting devices hitherto used have arisen chiefly from the
fact that one knife a (Figs. 3 and 4) is rigidly attached to the presser c, the other
cutting edge being secured to the setting bar d. When thus constructed the
severing of the strip can only take place if the slide face of the setting bar is in
precisely the same plane with that of the knife b secured to, the lower end of the
setting bar. Should the knife stand in the least behind the face of the setting bar
cutting cannot take place. Should the bottom knife project the top knife a catches and
if in this state the presser comes down either the edges of the knives mutually
destroy each other or the bottom part of the setting bar d and the knife b are
broken off.
The insertion of a new bottom knife b is very difficult since in practice it is
almost impossible to substitute a fresh knife having precisely the same thickness as
the old one which has been worn simultaneously with the face of the setting bar.
Even when screwing on the knife the least dirt between the knife and the setting
bar alters the position of the knife. If the cutting device refuses to act the pasting
of the box corners is immediately interrupted inasmuch as the strip cannot be
pushed forward under the presser and instead of this accumulates in front of it.
The proper working of the cutting apparatus is therefore a very important feature
of the whole machine.

page_text: According to our said invention the knife a¹ (Figs. 5 and 6) is no longer rigidly
attached to the presser c but is slid into a recess therein. The knife a¹ has two
projecting rims having a channel a² between them. Into this channel takes a
corresponding projecting part of the recess in the presser. The recess is of such a
depth that the knife has a little backward and forward play. A spiral spring f
continually presses the knife forwards while a small spring y prevents it from
falling out.
The knife al is formed symmetrically so that it may be reversed so that either
the side a³ or a can be used for cutting and thus it takes the place of two single
knives.
The cutting edges of the upper and lower knives have not similar angles so that
instead of simply stamping off the strip as has hitherto been the case a double shear
is formed by means of which the strip is shorn off.
In order to prevent the catching of the upper knife on the lower one the upper
knife a¹ is widened at its lower end by lateral projections at a and a6 (Figs. 6 and 7)
so that it is wider than the cutting edge of the lower knife . The projections as a
are bevelled off at the front and the back so that it is no longer of importance
whether the bottom knife is thicker or thinner or how much it may project from
the face of the setting bar.
On the descent of the presser c the projections as a (Fig. 7) of the upper knife a¹
first come in contact with the side parts 62 63 (that is, the non-cutting parts) of the
lower knife b¹.
Owing to the bevelling off of the projections as as the upper knife (Fig. 8) is
pressed backwards so as to run against the lower knife. The spiral spring con-
tinually presses the upper knife against the lower one and this pressure in combina-
tion with the unequal cutting angles of the knife edges produces a drawing cut
when the edges pass each other as in the case of a pair of scissors. A clean cutting
or shearing off of the strip is thus ensured.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. A cutting device for box edge pasting machines substantially as hereinbefore
described and shown.
2. In a box edge pasting machine the combination of a presser (c) (having a
recess in which the upper knife has longitudinal play), a spiral spring (f), an
upper knife (a) having lateral bevelled extensions (as a) to take against the non-
cutting part of the lower knife and a lower knife (b) the cutting edges of which
have a different angle from those of the upper knife (a) substantially as and for the
purpose set forth and shown.
3. In a cutting device such as described a symmetrically shaped reversible
knife (a) having two cutting faces (a³ and a4) substantially as and for the purpose
set forth and shown..
Dated this 19th day of August 1898.
E. T. WHITELOW, A.M.Inst.C.E.,
70, Deansgate, Manchester, Agent for the Applicants.