Improvements in Sawing Machines.
Year: 1899

page_text: Date of Application, 4th Mar., 1899-Accepted, 15th July,
1899
COMPLETE SPECIFICATION.
Improvements in Sawing Machines.
We, GOTTLIEB EMIL SCHLEGELMILCH and FRIEDRICH ALEXANDER MANN, trading
as La Raison Sociale Mann et Schlegelmilch Engineering Works, both of
Neundorf by Suhl, in the Empire of Germany, Engineers, 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 improved sawing machine which may be driven either manually or by
power is provided with a saw having a central aperture through which the work
passes. Its special advantage is its great simplicity as compared with the sawing
machines heretofore known.
The construction of the saw has a central aperture for cutting, located within
a revolving chain wheel rim, and mounted in a leverlike supporting frame with
reciprocating motion.
This affords great facility for exchanging the parts without dismounting the
machine, and at the same time allows thin saws to be used.
The tendency to tremble or buckle so noticeable in the use of thin saws in
ordinary machines is in this entirely obviated and thus a large amount of material
and work is saved. The point of attack of the cutting teeth is arranged to be
in the most favourable position especially also for cutting tubes and thus even
tubes of very thin material and little strength are not liable to become bent or
otherwise damaged through the action of the saw. Another advantage is gained
by the use of chain gear as the machine produces a constantly even and regular
cut. Furthermore, the working efficiency of the machine can be regulated as
desired by increasing or decreasing the pull of a specially arranged weight.
At the completion of the cut, the lever frame descends and rests its internal
frame on the cut piece without any disastrous consequence through a neglect in
stopping the machine. When desired, the machine may be provided with an
automatic stopping device.
The invention is shewn in the accompanying drawing, in which,
Fig. 1, is a plan of the machine, and
Fig. 2 shews a corresponding side elevation.
The ordinary cast iron bed a of the machine has cast in one with it at its left,
a supporting bearing for the driving shaft b, and at its right two blocks c with
a downwardly arranged wedge shaped internal space. The metal piece d
required to be cut, is passed through the said wedge shaped space, and is then
secured by means of screws c¹. The driving shaft e projecting from the bear-
ing bis provided at the left hand side of the machine with a pulley el or with
means for hand driving. At the opposite end of the shaft e, is mounted a loose
lever frame f of the form shown in the drawing and the purpose of which is
hereinafter explained.
In front of the lever f, and rigidly coupled to the driving shaft e, is a chain
driving wheel g.
A screw nut 2 securely retains on the shaft e, all fast and loose
parts. To the head or other end of the lever frame f in a suitable recess is
DO071

page_text: mounted the rim of a large chain wheel k, and this rim is secured in position by
means of a projecting steel plate k¹, fixed by screws at its farside in such a
manner as to enable it to revolve without however, moving sideways.
The chain secured in any well known manner upon the two driving wheels c
and h causes the parts to work in true co-operation.
The wheel rim h is cut on its outer face, shewn in Fig. 2, so as to receive the
improved saw-ring k, fixed by four or more screws and of any suitable thickness.
As may be seen from the drawing the saw has not, as usual, peripheral teeth
but is provided with such on the inner circle k², the latter may be of any con-
venient diameter, and the metal piece d is introduced into it, as shewn in Figs. 1
and 2, and is then cut through in a downward direction.
An adjusting device is provided for regulating the pressure of the saw in cut-
ting. This device consists of a strong screw fi, at the end of lever f, and of
a solid strap of flax or leather or the like which passes from it beneath the
roller m and over the roller n and which is fitted at its end with a bolt o and
nut o. This is weighted with a special form of cast iron discs or cheese weights ?
having a slot 2 to enable them to be placed upon the bolt o or to be removed
therefrom and which are screwed in position by means of a circular groove and
corresponding rib.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed, we declare that what
we claim is :-
(1). A sawing machine with chain gear without counter shaft either for mecha-
nical or hand power and having a sawk with cutting teeth arranged in an inner
epicycloidal circular opening through which latter the work is passed and
cut downwardly, it being characterised by a chain driving wheel g rigidly secured
on the driving shaft e upon which is also mounted a reciprocating lever arm f
carrying at its end, a chain wheel rim h in such a manner as to allow the
same to revolve without moving sideways, and to which rim, the saw (of any
desired thickness) is secured by screws. The work which passes through the
opening in the saw being held by screws with spanners ², and a chain i
through the intervention of a pulley e¹, shaft e, and driving wheel g, giving a
constant motion to the wheel rim h and consequently also to the saw, as herein
described and set forth.
(2.) The arrangement of an adjustable device for regulating the working pres-
sure of the saw comprising a bolt with nut o¹ to receive cast iron cheese
weights provided with slots p and circular grooves and ribs for retaining the
weights in position as herein described and set forth.
S. S. BROMHEAD,
Agent for Applicants,
171, Queen Victoria Street, London, E.C.
S. S. BROMHEAD,
Agent for Applicants,
171, Queen Victoria Street, London, E.C.