Improvements in Apparatus for Cutting and Trimming the Edges of Paste-board and the like.
Year: 1892

page_text: Date of Application, 27th Jan., 1892
Complete Specification Left, 27th Oct., 1892-Accepted, 27th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting and Trimming the Edges of
Paste-board and the like.
I, ARMIN KRAH, of 78 Alte Jacob Strasse, Berlin, S., in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention relates to apparatus for cutting and trimming the edges of paste-
board and the like.
The improved apparatus is designed to enable the edges of the pasteboard to be
cut bevel to any desired angle and also square, the adjustment being effected
rapidly and conveniently. I provide a stop which can be lowered automatically and
also a special device for causing the knife or cutter after every cut to return to the
raised position and for keeping it in the same to obviate accidents through
carelessly releasing the knife or cutter.
This apparatus has a table on which the pasteboard to be cut and trimmed is
laid, and which is provided with feet, its two lateral edges being mostly furnished
with a scale for enabling a guide at the rear, if used, to be adjusted exactly to the
width to be cut off. A clamp serves for holding the pasteboard during the cutting.
In order to permit the paste-board to be slid below this clamp the latter must be
raised and lowered. The clamp is attached at its two ends to draw rods by means
of thumb nuts with the object of raising or lowering the clamp according to
the thickness of the paste-board. The aforesaid draw rods are widened below to
form a loop in the slot of which a pin can be displaced. Each of the pins is
provided on a 'short crank the shaft of which is supported below the table and
connects the two cranks with each other, or, which is more suitable, consists of one
piece with them.
On one of the above-mentioned two pins I secure a handle by means of which the
shaft with the cranks can be placed in two positions. In one position the clamp is
raised, in order that the pasteboard may be pushed underneath, and in the other
position the clamp is firmly pressed upon the pasteboard. As in the latter
position the cranks are quite or nearly vertical the draw rod cannot rise again of
itself. For guiding the loop better, I provide in the front feet of the frame a slot
wherein a prolongation of the loop is adapted to slide.
The knife or cutter is of the kind usually employed in apparatus for cutting
paste-board, but the mode of securing the same is different because I provide for
changing the bevel. For this purpose the knife or cutter is adapted to turn at its
end upon a pin which is widened to form a lug and can be firmly fixed by means of
a thumb-nut extending through a curved slot in the said lug to the side of the table.
This pin can be turned upon a second pin arranged at a right angle to the same,
and occupying such a position that the cutting plane of the knife or cutter passes
exactly through its longitudinal axis. Accordingly the knife or cutter, after the
said thumb nut has been loosened can also be turned upon this pin and thus enable
the bevel to be changed at will. The knife or cutter plane may even be placed in
quite a vertical position in which case the pasteboard edge is cut square like the
shears heretofore employed.
Around one of the pins above referred to is wound a powerful spiral spring the
free end of which extends through an eye on the knife or cutter. The spring is
put under such tension that it will raise the knife or cutter under any circumstances,
thereby causing it to return to its upper position. This has for its object to
obviate every cause of accidents, for as soon as the knife or cutter is released it will
always move upwards, but can never descend of itself and injure the fingers of, the

page_text: hand. To avoid other accidents especially when taking hold of the knife or cutter
I arrange directly in front of the knife or cutter edge a protecting wire so that the
edge cannot be readily touched.
When the pasteboards or cardboards to be trimmed have already been cut to the
proper size, as is mostly the case, and the edge is only to be cut bevel the aforesaid
guide may be dispensed with, use being made of a stop bar. This is a straight bar
with its ends bent downwardly the latter being secured to two loops by means of
thumb nuts in such a manner that the stop bar can move up and down simultaneously
with the above mentioned clamp. In its upper position the stop bar which is very
much bevelled in front is high enough for the pasteboard to safely be put against it. 1
On moving the clamp downwards by turning the aforesaid handle the stop bar is
also moved downwards for enabling the knife or cutter to cut freely.
Dated this 27th day of January 1892.
· HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Cutting and Trimming the Edges of
Paste-board and the like.
I, ARMIN KRAH, of 78 Alte Jacob Strasse, Berlin S., 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 :-
The paper cutting machine which forms the subject of the present invention and
which is designed for cutting or trimming bookbinder's material or strong paper,
cardboard, pasteboard, millboard, strawboard and the like is characterized by
the fact that it will trim the edges of the said material at any desired angles
while the adjustment of the angle of the cut is rapidly and conveniently effected.
The machine is further provided with a stop bar which is lowered automatically
and with a peculiar device for bringing the knife back into its raised position as
soon as it has been operated and to hold it steadily in this position in order to
prevent accidents which may result from a careless and untimely release of the
knife.
In the accompanying drawings,
Figure 1 is a front view of the machine.
Figures 2 and 3 show side views of the same.
Figure 4 is a plan thereof.
Figure 5 shows the mechanism for adjusting the knife.
Figure 6 shows a modification of the same and
Figure 7 shows an arrangement for limiting the movement of the knife.
The table A of the machine upon which is placed the board or paper requiring
to be cut or trimmed is furnished with feet a' and scales a Figure 4 along its two
extreme edges whereby the size of that part of the board or paper which has to
be cut off can be properly adjusted if required. The pressure bar c serves to
tightly hold the paper or board while it is being cut, and is therefore made so
that it can be raised and lowered in order to push the board under it and fix
it in positicu. This arrangement is shown more particularly in Figures 2, 3 and 5,
the bar e being fixed at its two ends to the draw rods d by means of screw-threads
upon which move two fly nuts e for the purpose of adjusting the bar and raising 'or
lowering it according to the thickness of the board or paper.
The draw rods d are provided at their lower ends with an enlargement having
the form of a slotted guide in which a pin or journal i can be moved. The
pins i form part of a short crank handle the axis k of which is arranged under
'the table (Figure 1) and connects the two pins together or is formed preferably
in one piece therewith. Upon one of the two pinsi is mounted a handle 7 by-

page_text: means of which the shaft k and the cranks h can be moved into either of the
two positions shown in Figures 2 and 3, the position Figure 3 corresponding to
the highest position of the bar c when the board can be slipped under the same,
while that illustrated in Figure 2 corresponds to the lowest position of the said
bar when it is tightly pressed upon the said board. While in this latter position
the cranks are vertical or nearly so and the draw rods cannot be raised again
automatically. To better guide the piece f a slot m is formed in the front feet of
the frame, wherein moves a projection or extension of the said piece f.
The knife B is such as is ordinarily used in paper cutting machines, but differing
however in the manner in which it is fixed in order to provide for variation in the
angle of the cuts. For this purpose the knife is arranged to move at one end upon
a pivot or axis o which terminates in an enlargement or extension o¹ Figure 5
capable of being screwed or otherwise, fixed to the side of the table by means of
a thumb screw 9 passing through a curved slot p formed in the said extension o¹.
This pivot o is capable of turning upon a second pivot r arranged perpendicularly
to the same, whereby this pivot is so situated (Figures 2 and 3) that the cutting
plane of the knife passes accurately through its longitudinal axis. The said knife
can likewise be turned upon this pivot after the thumb screw 9 is loosened so that
the obliquity or angle of the cut may be altered at will. The knife plane may thus
be placed in a vertical position as shown in Figure 2 by the dotted line, in which
case the board is cut straight, the oblique blade having thus been converted into an
ordinary straight cutting blade.
Upon the axis o is coiled a stout spiral springs, the free extremity of which
passes through an eyelet t fixed to the knife. This spring is so tightly stretched
or coiled as to always raise the knife into the position shown in Figure 1. This is
intended to prevent any possibility of an accident, since as the knife, as soon as it is
released will spring upwards again, cannot therefore drop down upon the fingers of
the operator's hand. To further provide against accidents such as taking hold of
the knife with the hand a protecting wire u is arranged in close proximity to the
knife blade so that the edge thereof cannot be touched.
When the board or paper requiring to be operated upon is previously cut to the
right size as usual and it is desired to cut the edges thereof obliquely the scales
can be dispensed with, the guide bar w being used instead and acts as a stop for the
board or paper. The two ends of this bar or rail are bent down at right angles
and are screwed to the two guides f by means of the fly nuts g so that the said bar
may be moved up and down at the same time as the pressure bar c.
In the position shown in Figure 3 the bar or rail w which is sharply bevelled in
front is raised to such a height as to allow of the edge of the board being safely
placed against the same, and as the pressure bar is moved down by turning the
handle the rail w is likewise depressed and the knife B is free to cut as in
Figure 2.
3
The spring & is, as shown in Figure 6 firmly connected with the pin or pivot o or
it may be provided with adjusting means for the purpose of altering the height of
the knife in accordance with the length of the board requiring to be cut. This
adjusting means consists of a ring movable about the axis of the pivot o and in
which the springs is firmly hooked; this ring is tightly clamped in any suitable
position by means of the washers and fly nuts which washer being quadrangular
in shape cannot turn upon the pivot o. In order to adjust the knife to a height
suitable for the length of the board to be cut, the fly nuts is loosened, the
knife is raised to the desired height and the said nut is tightened again so that
after cutting the knife will now constantly spring back to the height thus fixed.
The springs with or without the adjusting means as well as the adjustable
pressure bar e may also be used in straight paper cutting machines.
To prevent the spring being put under excessive tension so as to render it
liable to break, the movement of the knife is limited, so that the spring acts only
within definite limits. Figure 7 shows the arrangement, some of the parts being
omitted for clearness.

page_text: .
The knife B is provided with a prolongation 6' bent round to the rear, this
prolongation 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
indicated by full lines. The position of the knife indicated by dotted lines
represents the lowest position. The knife can only swing between these two
positions the springs is therefore only set in action for a small portion of the
movement of the knife, whereby breakage of the spring is obviated.
•
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1
1. The combination with a table A, and a cutter B of the draw-rods d having
slotted guide pieces. f, the pressure bar e extending over the table and adjustable
on the draw-rods, and the shaft & located beneath the table and having a handle 1,
and cranks engaging the slots of the guide pieces for raising and lowering the
draw-rods and pressure bar, substantially as described.
2. The combination with a table A, and a cutter B, of the draw-rods d having
slotted guide pieces the pressure bar c adjustable on the draw rods the shaft
having a handle 7 and cranks / engaging the slots of the guide pieces for raising
and lowering the draw-rods and pressure bar, and the guide bar or rail w having its
'extremities turned down and connected with the slotted guide pieces, substantially
as described.
3. The combination with a table A, and a cutter B adjustable to vary obliquity
of cut, of the draw rods d having slotted guide pieces f, the pressure bar c adjustable
on the draw rods, the shaft k having a handle and cranks h engaging the slots of
the guide pieces for raising and lowering the draw rods and pressure bar, and
a guide bar or rail w provided with a sharply bevelled edge and having its
extremities turned down and connected with the slotted guide. pieces, substantially
as described.
4. The combination with a table A, and a swinging knife B, of the pivot pin o,
the fixed washers, the ring movable on the said pivot, the spring; connected
with said ring, and the nuts on the pivot, substantially as described.
5. The combination with a table A, an adjustable pivot o, and a cutter B
mounted on said pivot, of the draw rods d having slotted guide pieces f, the
pressure bar c adjustable on the draw rods, and the shaft k having a handle and
cranks / engaging the slots of the guide pieces, substantially as described.
6. The combination with a table A and a swinging knife B, provided with a
prolongation 6, and of the regulating screw 63, the end of said screw pushing
against the end 6 of the table A for limiting the movement of the knife upwards,
substantially as described.
Dated this 27th day of October 1892.
↓
Dated this 27th day of October 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.