Improvements in Tools or Instruments for Outting, Slitting, and Punching Straps or Bands for Looms and other purposes.
Year: 1891

page_text: Date of Application, 27th Apr., 1891-Accepted, 30th May, 1891)
CUMLELE
Improvements in Tools or Instruments for Outting, Slitting, and
Punching Straps or Bands for Looms and other purposes.
We, ALBERT KRAFFT and CARL FRIEDRICH KRAFFT, trading as Krafft
Brothers, of Fahrnau, Baden, Germany, Manufacturers of Leather, 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 :-
Our improved tool is intended more especially for cutting, slitting and punching
bands or straps for looms, but is also applicable for cutting, slitting and punching
straps or belts for other purposes, which are of uniform width and require to be cut,
alit or punched in a uniform manner.
Bands or straps we believe have been hitherto cut mostly by hand, by a common
pocket-knife and punched by a punch and hammer, and the work is thus done in an
imperfect manner, the slit which is required at one end is seldom cut in the middle
of the widthway of the band, and at the proper distance from the end and the end
of such slit is not rounded as is necessary to prevent the slit from tearing out, and
the holes which should be in the middle of the strap are seldom so placed, and when
the strap is to be cut across it is not often cut square to its length.
By our improved instrument these difficulties in cutting, slitting and punching
are obviated, and by its use, any person however unskilled can cut, slit and punch
the straps or bands in the most perfect and satisfactory manner, consequently they
will wear longer and there will be a saving in picking bands.
Our improved instrument consists of a pair of levers jointed together, to one of
which levers the cutter and punches are attached and they cut against surfaces
secured to the other lever, the cutter and punches upon. one lever and the guiding
devices upon the other are arranged to effect the purposes required.
The instrument or tool will be most readily described and understood by reference
to the accompanying drawings in which
Fig. 1 is a side elevation, and Fig. 2 is a top plan view.
a, is what we will term the top lever, and it is jointed to the lower lever b, at a¹,
by a fulcrum pin, which passes through a hole in a projection 61, upwards from the
lever b, and the two projections a², forming a fork on the lever a, between which
projections a, the projection b', works.
To the upper lever a, a knife c, is secured, one end of which terminates in a
punch c, the punchings from which come out at the hole c².
The lengthway of the knife c, is at a right angle to the lengthway of the levers a,
and b, and thus parallel to the axis of the joint pin a', between the levers.
The sharp edge of the knife cuts against a piece of copper d³, secured to the
upper face of a rectangular plate d, secured by rivets or otherwise to the lower
lever b, the lengthway of the plate being parallel to that of the knife c.
This plate d, has a thin plate secured to it by a screw d, the edges d³, of which
plate are turned up on three sides of the plate d, to project above its surface.
There is also another thin plate e, secured by a screw e', to the underside of the
other end of the plate d, but the edges of this thin plate only project above the
surface of the plate at each side, that is at e³.
There is another thin plate f, secured by a screw /1, to the underside of the plated,
which acts to form a guiding surface when the cutter c, is to act to sever a piece
from a strap at a right angle to its length.
Another punch g, is secured at one end in the upper lever a, and it cuts against a
piece of copper or other soft metal g', secured upon the lower lever b. This piece
of soft metal g', is made to turn at one end upon a screw g³, as a fulcrum screwing
into the lever b.

page_text: In the position in which the jointed piece g¹, is shown in Fig. 2 the cutting end
of the punch g, will not come against it, but when this piece 9¹, is turned under the
punch, into the position shown in dotted line, it will then cut against the piece g¹.
By this arrangement when the knife c, and punch c', is acting to cut, the punch 9,
is not operating, being then clear of the part (which should be first turned to one
side), and when the punch g, is acting to punch, the knife, does not come against
the surface of the part d', as the punch g, will come against its surface 71, upon
which it cuts, before the knife c', touches its surface d', by which means unnecessary
wear of the knife and punches is obviated.
When cutting
a slit with the hole in one end of the slit, the strap is inserted
between the knife c, and the surface against which it cuts until the end of the strap
is close against the projection d², and it is guided also between the projections e³,
and thus the slit is cut in the middle of the strap and at the required distance from.
its end.
When a piece is to be severed from the end of the strap its end is drawn or
pushed in over the surface, and under the edge of the knife c, and on one side of
the strap comes against the edges of the two projections e³, which thus keep it
square to the knife c.
The punch 9, is fixed in such position as to be half the width of the strap to be
punched from the edge of the plate d, or the turned up edges of the thin plates d³,
and e, so that when one side of the strap is placed against those surfaces before
being punched the hole will be certain to be made by the punch in the middle of
the strap.
It will be understood that the plate d, and its guiding parts d', and ', are made
to suit the width of the straps to be operated upon and the distance at which the
hole at the end of the slit is to be cut from-the end of the strap.
The punch 9, is arranged in relation to the guiding surface on the edge of the
plate d, or the guiding surface or edges are regulated in relation to the punch g, so
that when the strap is held against the guiding surface or surfaces the holes will be
punched in the middle of the strap.
h, is a spring one end of which is secured to the lever b, the other or free end
acting upon the under surface of the lever a, this spring acting to open the levers. a,
and 6, after they have been pressed towards each other for cutting, slitting or
punching.
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.
1. The combination of two levers with knives, punches, and guiding and holding
arrangements substantially as and for the purpose hereinbefore described and
illustrated by the drawings.
2. The combination and arrangement of the combined knife and punch and the
punch for punching only, in such manner that when one is to cut or cut and punch,
the other does not punch and when the latter punches the combined cutter and
punch will not come against the surface against which it acts when it is to operate,
substantially as hereinbefore described and illustrated by the drawings.
3. The combination and arrangement of the parts, substantially as and for the
purpose hereinbefore described and illustrated by the drawings.
Date: m
PETER J. LIVSEY,.
Agent.