Improvements in Apparatus for Cutting and Trimming Pasteboard and the like.
Year: 1893

page_text: Date of Application, 21st Feb., 1893
Complete Specification Left, 21st Nov., 1893-Accepted, 21st Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting and Trimming Pasteboard
and the like.
I, ARMIN KRAH, of 78 Alte Jacobstrasse, Berlin, in the Empire of Germany,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
My invention relates to an apparatus which serves for cutting and trimming
bookbinder's pasteboard, piles of paper and the like. The knife is adapted to be
adjusted with its pivot in such a manner that the cutting plane of the knife may be
placed at will either obliquely or perpendicularly to the pile of paper.
The said invention comprises the arrangement of a stop bar which is raised and
lowered independently of the knife, and the arrangement of an adjusting device
designed for preventing accidents when the cutter is carelessly released.
1
The table on which the pasteboards to be cut are placed is carried out in the
well-known manner; it has ordinarily at the two lateral edges a scale for
facilitating the accurate adjustment of the stop bar at the rear which may be placed
either parallel or obliquely to the cutting edge. A second bar placed near the
cutting edge behind the knife serves for clamping the pasteboard while it is
being cut.
This bar is provided at its two ends with draw rods adapted to be adjusted by
nuts whereby it may be placed higher or lower according to the thickness of
the pasteboard or pile of pasteboards to be cut or trimmed. The draw
rods terminate below in lugs formed with slots. With these slots engage pins or
journals which are arranged eccentrically at the ends of a shaft supported below
the table. The shaft may be easily turned by means of a handle. When the
handle is turned upwards the aforesaid bar is raised and the pasteboard can then be
readily removed from below the same, and fresh pasteboard put below it for
performing the next cut. When the lever is then pressed down the fresh paste-
board is again clamped, inasmuch as the eccentric pins or journals pull the draw
rods down.
The knife may be arranged so that it can be adjusted with the pivot in the known
manner. It is in this case, adapted to turn upon a pivot which widens into a lug
and can be fixed to the side of the table by means of the thumb screw extending
through the slot in the same. The pivot is adapted to turn upon a second pivot
arranged perpendicularly to it and the axis of which is exactly in the same
direction as the cutting edge, and the knife is so placed relatively to it that in
every position the knife plane moves exactly past the cutting edge of the table.
By turning the second pivot and fixing the same by means of the aforesaid thumb
screw the knife plane can therefore be adjusted obliquely or perpendicularly as may
be desired.
In many cases I provide for the adjustment of the knife by arranging its pivot
on a block and securing the pivot of this block, which is perpendicular to the first
pivot, in a support fixed to the table. The second pivot is held in a clamping
support and may be fixed therein in any desired position by tightening the screw
of this support. It is provided at its free end with a scale and on the support is a
pointer or a line serving for the same purpose so that the knife can be set to
definite cutting planes. The second pivot has also in this instance exactly the same
direction as the cutting edge of the table so that the knife plane will in every
oblique position of the knife be exactly in front of the cutting edge. When the
knife is to be adjusted for a definite cut the screw of the clamping support is

page_text: loosened, the knife is turned to the proper position upon the pivot and clamped
again by tightening the said screw.
Usually the pasteboards cards and the like have already been cut to the desired
size and it is then only necessary to cut them obliquely. In order that the paste-
boards are then placed accurately against the cutting edge of the table I provide
stop bar which may be secured to the frame of the table in any suitable manner.
The stop bar is automatically raised or lowered by the knife; in the downward
movement of the knife the bar also moves down in order that it may not be in the
way during the cutting, and it is lifted again when the knife moves upwards. For
this purpose the said bar is jointed to another bar which is arranged below on the
frame by means of parallel links so that the first bar displaced parallel to itself
in its upward and downward movement. A spring between the links always tends
to pull the said bar downwards. Near the pivot and on the under side of the
knife is placed a pin which when the knife moves upwards strikes against a stop on
the bar. When the bar is in its lowest position the pin is far away from the stop
when, after the cut has been made, the knife is raised the pin strikes against the
stop and shifts it from right to left, thereby raising the same. Such a device, as
compared with the devices heretofore employed has the advantage that the knife
cannot strike the bar.
This device may be modified by replacing the beforementioned stop by a
projection which is approximately perpendicular to the knife. Into this projection
is screwed an eye adapted to be freely displaced upon a rod loosely connected or
jointed to the said bar. When the knife is raised a certain distance the eye strikes
against a reinforce of the rod and pushes this back together with the bar so that
the latter will be raised. The downward movement of the bar is caused by a
spring.
To prevent accidents, which might take place by the falling of the knife, I fix on
the pivot of the latter a spring which keeps the knife raised. With this spring
may suitably be connected an adjusting device for enabling the upward movement
of the knife to be limited according to the length of the materials to be cut or
trimmed. This adjusting device may consist of a disc fitted to turn upon the axis
of the said pivot and to which the spring is firmly attached. This disc can be
clamped by a thumb nut in every position by means of another disc which cannot
turn by reason of the square on the said pivot. The adjustment is effected by
loosening the thumb nut, moving the knife into the raised position suitable for the
length of the materials to be cut or trimmed, and fixing the spring in the position
it now occupies by tightening the thumb nut and thereby fixing the first disc.
Then the knife will always move back after the cutting to the position to which it
has been adjusted.
Of course the said spring and the adjusting device may also be employed in
apparatus for cutting pasteboard and cardboard straight.
To prevent the spring being excessively strained and thereby rendering it liable
to break the movement of the knife is such that the spring operates only within
certain limits. In this instance the knite is provided with a prolongation bent
round to the rear and carrying an adjusting screw. The end of this adjusting
screw strikes against the edge of the frame when the knife is in its highest
position.
As the knife can only oscillate between these two positions the spring is brought
into action only for a small portion of the movement of the knife, thereby
precluding the possibility of breakage.
Dated this 21st day of February 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Cutting and Trimming Pasteboard
and the like.
I, ARMIN KRAH, of 78 Alte Jacobstrasse, Berlin, in the Empire of Germany,
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 :--
My invention relates to an apparatus which serves for cutting and trimming
bookbinder's pasteboard, piles of paper and the like. The knife is adapted to be
adjusted with its pivot in such a manner that the cutting plane of the knife may be
placed at will either obliquely or perpendicularly to the pile of paper.
The said invention comprises the arrangement of a stop bar which is raised and
lowered independently of the knife, and the arrangement of an adjusting device
designed for preventing accidents when the cutter is carelessly released.
In the accompanying drawings,
Figure 1 is a front elevation of a pasteboard cutter constructed according to this
invention showing the knife raised.
Figure 2 is a side elevation of the same.
Figure 3 is a similar view to Figure 1 showing the knife moving downwards.
Figure 4 shows the adjusting device for the knife spring in section.
Figures 5 and 6 show a modified construction, and
Figure 7 shows an arrangement for limiting the movement of the knife.
The table A on which the pasteboards to be cut are placed is carried out in the
well-known manner; it has ordinarily at the two lateral edges a scale for
facilitating the accurate adjustment of the stop bar b Figure 2 at the rear, which
may be placed either parallel or obliquely to the cutting edge.
A second bar e placed near the cutting edge behind the knife serves for clamping
the pasteboard while it is being cut. This bar may be raised or lowered by means
of the device shown in Figures 2 and 3. Here the bar c is provided at its two ends
with draw rods fadapted to be adjusted by nuts e whereby it may be placed higher
or lower according to the thickness of the pasteboard or pile of pasteboards to be
cut or trimmed.
The draw rods f terminate below in lugs g formed with slots h. With these slots
engage pins or journals which are arranged eccentrically at the ends of a shaft r
supported below the table. The shaft may be easily turned by means of a
handle. When the handle is turned upwards the aforesaid bar c is raised and
the pasteboard can then be readily removed from below the same, and fresh
pasteboard put below it for performing the next cut. When the lever is then
pressed down the fresh pasteboard is again clamped, inasmuch as the eccentric
pins or journals i pull the draw rods down.
The knife B as shown in Figures to 4 may be arranged so that it can be
adjusted with the pivot in the known manner.
It is in this case adapted to turn upon a pivot o as shown in Figure 4, which
widens into a lug o¹ and can be fixed to the side of the table by means of the
thumb screw 9 extending through the slot p in the same. The pivoto is adapted
to turn upon a second pivot arranged perpendicularly to it which is shown by
dotted lines in Figure 4. This journal has its axis exactly in the same direction
as the cutting edge, and the knife is so placed relatively to it that in every position
the knife plane moves exactly past the cutting edge of the table. By turning the
second pivot and fixing the same by means of the aforesaid thumb screw q the
knife plane can therefore be adjusted obliquely or perpendicularly as may be
desired,

page_text: In many cases I provide for the adjustment of the knife illustrated in Figures 5
and 6 by arranging its pivot on a block o' and securing the pivot o* of this block,
which is perpendicular to the first pivot, in a support of fixed to the table. The
second pivot o is held in a clamping support and may be fixed therein in any
desired position by tightening the screw of of this support. It is provided at its
free end, as shown in Figure 6 with a scale and on the support o³ is a pointer or a
line serving for the same purpose, so that the knife B can be set to any definite
cutting plane or angle.
The second pivot o' has also in this instance exactly the same direction as the
cutting edge of the table so that the knife plane will in every oblique position of
the knife be exactly in front of the cutting edge. When the knife is to be adjusted
for a definite cut the screw of of the clamping support is loosened, the knife is turned
to the proper position upon the pivot o² and clamped again by tightening the said
screw o¹.
Usually the pasteboards cards and the like have previously been cut to the desired
size and it is then only necessary to cut them obliquely. In order that the paste-
boards are then placed accurately against the cutting edge of the table I provide as
in Figures 1, 2, 3 a stop bar w which may be secured to the frame of the table in
any suitable manner. The stop bar w is automatically raised or lowered by the
knife; in the downward movement of the knife the bar also moves down in order
that it may not be in the way during the cutting, and it is lifted again when the
knife moves upwards. For this purpose the said bar w is connected to another
bar attached to the frame by means of parallel links z so that the first bar w is
displaced parallel to itself in its upward and downward movement. A spring z¹
between the links always tends to pull the said bar downwards.
Near the pivot
and on the underside of the knife is placed a pin which when the knife moves
upwards strikes against a stop to on the bar w. When the bar is in its lowest
position as in Figure 3 the pin is some distance away from the stop 10°, when,
after the cut has been made, the knife is raised the pin strikes against the stop w°
Figure 1 and shifts it from right to left, thereby raising the same.
Such a
device, as compared with the devices heretofore employed has the
advantages that the knife cannot strike the bar.
In Figures 5 and 6 this device may be modified by replacing the before
mentioned stop by a projection w³ which is approximately perpendicular to the
knife. Into this projection is screwed an eye wo adapted to be freely displaced
upon a rod w¹ loosely connected or jointed to the said bar c. When the knife is
raised a certain distance the eye w strikes against a reinforce w³ of the rod w¹ and
pushes this back together with the bar w so that the latter will be raised. The
downward movement of the bar w is caused by a spring .
.
To prevent accidents, which might take place by the falling of the knife, I fix on
the pivot o of the latter a springs which keeps the knife raised. With this spring
may suitably be connected an adjusting device for enabling the upward movement
of the knife B to be limited according to the length of the materials to be cut or
trimmed. This adjusting device may consist as shown in Figures 1 to 6 and
specially in Figure 4, of a disc s fitted to turn upon the axis of the said pivot o
and to which the springs is firmly attached. This discs can be clamped by a
thumb nuts in every position by means of another disc which cannot turn by
reason of the square on the said pivot o. The adjustment is effected by loosening
the thumb nut, moving the knife into the raised position suitable for the length
of the materials to be cut or trimmed, and fixing the spring in the position it now
occupies by tightening the thumb nut and thereby fixing the first disc. Then
the knife will always move back after the cutting to the position to which it has
been adjusted.
Of course the said springs and the adjusting device, may also be employed in
apparatus for cutting pasteboard and cardboard straight.
To prevent the spring being excessively strained and thereby rendering it liable
to break, the movement of the knife is such that the spring operates only within

page_text: certain limits. Figure 7 shows this arrangement with omission of all the
immaterial parts. In this instance the knife B is provided with a prolongation 61
bent round to the rear and carrying an adjusting screw 6. The end of this
adjusting screw strikes against the edge 6 of the frame when the knife is in its
highest position as indicated in full lines; the lowest position being indicated by
chain lines. As the knife can only oscillate between these two positions the spring
is brought into action only for a smali portion of the movement of the knife, thereby
precluding the possibility of breakage.
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 :-
:-
1. An apparatus for cutting and trimming pasteboard and the like, in which the
stop bar w is arranged to move horizontally upon links Z and in which a projection
or arm provided on the knife is adapted to permit the downward movement of the
stop-bar, under the action of a spring, during the downward movement of the knife,
in order that the cutting edge of the table may be free, the said arm or projection
acting on the stop bar, during the upward movement of the knife, so as to raise
the said bar to its uppermost position, substantially as described and shown in the
drawings.
Second. In apparatus for cutting and trimming pasteboard and the like the
displacement of the knife, for the purpose of obtaining an oblique cut, in such a
manner that the pivot of the knife is provided on a block which is adjustable round
another pivot, which latter is perpendicular to the former, while its axis is in the
same direction as the cutting edge of the table, substantially as shown and described
with reference to Figures 5 and 6 of the drawing.
Third. In apparatus for cutting and trimming pasteboard and the like by an
oblique cut the arrangement of a graduation on the adjusting pivot and a mark on
the support of the pivot, for the purpose of obtaining an accurate adjustment,
substantially as described with reference to Figure 6.
Fourth. In apparatus for cutting and trimming pasteboard and the like the
adjustability of the spiral springs, holding the knife in the raised position or
moving it back to the same, by means of the disc adapted to be turned and the
disc which cannot be turned, and the nut a substantially as described and shown
in Figure 4 of the drawings.
Fifth. In apparatus for cutting and trimming pasteboard and the like, the
combination with the knife B and its prolongation b³, an adjusting screw b the end
of which strikes against the end 63 of the table, for the purpose of limiting the
movement of the knife, substantially as described and shown in the drawings.
Sixth. In apparatus for cutting and trimming pasteboard and the like, the fixing
of the clamping bar by means of pins i arranged eccentrically on a shaft and
which engage with slots in the draw rods fg, substantially as described and shown
in the drawings.
זג.
1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.