An Improved Machine for Cutting Strips or Bands into Short Lengths.
Year: 1889

page_text: Date of Application, 20th May, 1889
Complete Specification Left, 15th Feb., 1890-Accepted, 29th Mar., 1890
PROVISIONAL SPECIFICATION
An Improved Machine for Cutting Strips or Bands into Short
Lengths.
I EMIL LIEBMANN of 1 Bettinastrasse Offenbach on the Main, Germany Manu-.
facturer do hereby declare the nature of this invention to be as follows:-
This Invention relates to a machine for cutting strips or bands into equal lengths,
particularly for boot and shoe laces, the length being variable according to require-
ments.
The machine comprises a revolving frame or skeleton drum composed of radial
arms carrying longitudinal bars, the latter being four, more or less, in number armed
with points spaced according to the width of the hands and corresponding in the
circular direction with those of the adjacent bars. Guides and spring brakes or
tension devices are provided at the side at which the bands are led on to the drum,
whereby a sufficient strain on the bands is ensured, to cause the bands to he penetrated
by the points and become lapped round the drum on which the bands occupy the
position of chords of the arcs subtending the angle formed by two adjacent sets of
radial arms and bars. The point-carrying bars are radially adjustable for the
purpose of varying the lengths into which the bands are cut. The machine also
comprises a cutter bar parallel to the drum furnished with adjustable cutters and
adapted to be reciprocated in the radial direction of the drum, said bar being operated
by a crank or other contrivance for converting rotary into reciprocating motion,
the bar being driven from the drum shaft through suitable multiplying gear. A
stripper consisting of a notched bar is also provided for removing the cut lengths
from the points of the frame, all these parts being variously adjustable with regard
to each other. To enable two or more different lengths to be cut at once by the same
machine, the machine may itself be divided into lengths, having independent
adjustability.
The strips or bands to be cut are arranged side by side in coils and are led
through the guides and tension devices side by side and on to the revolving frame or
drum by which (after once being impaled on the spikes or points) said strips or bands
continue to be carried round to the cutters which are at same time moved forwards
towards the drum and sever the bands or strips at a given place. The cutters meet
the bands at an acute angle and they are V-shaped and so bevelled as to allow for
the relative motion of the parts and produce a straight cut. The cut lengths remain
adhering to the points from which they are removed on the continued rotation of the
drum or frame, by passage of the points through the notches of the stripper bar.
Data: 0
1
1000
E. LIEBMANN.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.
COMPLETE SPECIFICATION.
An Improved Machine for Cutting Strips or Bands into Short
Lengths.
I, EMIL LIEBMANN of 1, Bettinastrasse, Offenbach on the Main, Germany, Manu-
facturer, 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:-
This Invention consists of a machine for cutting strips or bands, particularly for
leather shoe laces, into pieces of equal length according to requirements.

page_text: The machine is represented in the accompanying drawing, forming part of this
specification, wherein figure 1 is a transverse section, figure 2 a front elevation,
figure 3 a plan, and figure 4 a side view, of knife operating mechanism.
z
Upon the shaft A mounted in frame G are fixed discs B each having four radial
arms arranged crosswise, to which plates D are fixed by means of slots s and
screws s¹ and so as to be radially adjustable and are provided with outwardly-pro-
jecting points a in any required number, and at a distance apart dependent on
the width of the broadest band or strip to be cut. A brake or tension device for
the bands is attached to the frame G said brake consisting of the two cross-bars E
and F fixed adjustably by means of bolts d in slots c of the frame. The bar E
has guide grooves n whose breadth is the same as, and depth a little greater than,
the thickness of the bands or strips. The ends of the bands are led through
these grooves n and pressed against the bar F by means of flat springs adjusted
by set screws d, one in each groove n so that sufficient tension must be applied
to the bands or strips, in order to draw them through the grooves, as to cause
the points a to penetrate, and engage in the bands. The cutting of the hands is
performed by cutters e fixed adjustably on a bar H by means of slots and screws.
The cutter bar H reciprocates in guides and receives a to and fro motion in the
direction of shaft A by mechanism, at either side of the frame, comprising toothed
wheels Z keyed on the shaft A gearing with pinions revolving on fixed studs
and each carrying a crank pin g. The cranks have the same radius and are in
line with each other and are connected by rods with the cutter bar H. The
connection of rods with the cutter bar H is adjustable by means of sliding
sockets k secured by set screws on the rods and formed with eyes which take
hold of gudgeons at the ends of the cutter bar. By this means the position of
the cutter bar can be adjusted to correspond to the radius of the points a. The
toothed gear has a ratio of 4 to 1, consequently the cutter bar H receives four
forward and backward motions for every revolution of the shaft A. The rotation
of the points a is so timed with regard to the cutter notion that directly each
row of points a arrives in the horizontal position a¹ the cutters e, which then lie
a little above the points, move forward and sever the bands or strips. Experience
has shewn that, in this position of the points of the cutters as well as the inclined
position a a¹ of the bands (which rotate during the cutting in the direction of
the arrow) the cutters which are V-shaped and have two cutting edges el give a
straight cut. As the cutters make four cutting motions for one revolution of the
shaft A, the bands are cut through at a constant distance above the horizontal
position of each row of points. After being thus severed, the lengths are removed
from the points a by a stripping contrivance consisting of a notched bar or comb J
fixed adjustably to supports L by screws and slots and through whose indents o the
points a on rotating pass, whereby the cut off bands hanging on the points are stripped
off. The length of the bands cut off is proportional to the radial distance of the
points a a¹ from the centre A which may be varied at will according to the length of
band to be cut off.
In order to be able to simultaneously cut off bands of two different lengths, the
plates D are divided at the middle (figure 2) so that each set of plates can be adjusted
independently of the other, the stripper being also divided and the cutters e made
individually adjustable. The machine may be driven by hand wheel S fast on the
shaft A and provided with crank handle t or by power.
The working is, shortly, as follows;-After the ends of the strips have been drawn
from the rolls placed side by side in boxes through the guide grooves n, each separate
band is impaled on a corresponding point a, then occupying the position indicated
by a figure 1; The pressure of the tension devices applies sufficient tension to the
bands to cause them to be penetrated by the other points a as they come round into
position by the revolution of the apparatus. Each time that the row of points arrives
at the position a', the knives e are brought forward so as to sever the portions of the
bands occupying the inclined position a a¹ after which the severed portions are
removed by the stripper J as before explained.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. A machine for cutting strips or bands into short lengths, wherein the strips or
bands, as drawn from juxtaposed rolls, are passed through guiding and tension devices
and lapped round a revolving frame provided with radially-adjustable points which
penetrate the bands and are, by the revolution of the frame, presented to reciprocating
knives which sever the bands into short lengths which are then removed from the
points by a stripper, substantially as specified.
2. In the herein described machine for cutting strips or bands into short
lengths, connecting the plates D, carrying the points a, to radial arms of the
revolving frame by bolt and slot connections ss so as to make them adjustable
radially for the purpose of varying the length of the bands cut off, substan-
tially as specified.
3. In the herein described machine for cutting strips or bands into short lengths,
the tension apparatus consisting of the bars E and F attached adjustably to the frame,
as described, one being provided with grooves n and adjustable pressure springs
whereby the necessary tension is applied to the bands, substantially as specified.
4. In the herein described machine for cutting strips or bands into short lengths,
the combination, with the revolving frame around which the strips or bands are lapped,
of a knife bar H carrying adjustable cutters e reciprocating in a direction radial
to the revolving frame and of pairs of cranks and connecting rods driven by toothed
gearing from the revolving frame in a ratio proportional to the number of point-
carrying bars on the frame so that the cutter bar will make in one revolution of the
frame as many complete strokes as there are point-carrying bars for the purpose of
severing the bands, as described.
5. In the herein described machine for cutting strips or bands into short lengths,
the stripping device consisting of notched bar J attached adjustably to a support in
such position that the points of the point-carrying bars will pass between the teeth of
the stripper which will thereby remove the severed bands, as specified.
Dated this 10th day of February 1890.
Dated this 15th day of February 1890.
E. LIEBMANN.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.