Improvements in Automatic Machines for Cutting Oval Metal Pieces.
Year: 1889

page_text: Date of Application, 23rd Sept., 1889--Accepted, 18th Jan., 1890
Improvements in Automatic Machines for Cutting Oval Metal
Pieces.
I LOUIS SCHULER, of Göppingen in the Empire of Germany Manufacturing
Engineer,do hereby declare the nature of this invention andin what mannerthe same
is to be performed to be particularly described andascertained in and by the following
statement:
My invention relates to improvements in Automatic Machines for Cutting Oval
Metal Pieces and consists chiefly of a common driving gear for the circular blades,
and for the oval-describing mechanism, which is carried out by means of a friction
coupling coming into operation. Whenever the blades are unable to perform the
work rapidly enough, owing to the large size of the metal sheets or plates operated
проп. In consequence of this friction coupling coming into operation, the path
followed by the oval-describing mechanism, is travelledover ata reducedspeed, whereby
The rotatory speed of the sheet or plate requiring to be cut is so reduced as to allow
the blades to accomplish their shearing work. The machine is further provided with
an automatic disconnecting gear, by means of which the former is brought to a stand
still as soon as an ovalplate is completely cut out. To ensure the cutting being
constantly effected tangentically to the oval, the axis of the blades receives
oscillating motion to one side, so that such axis should always be perpendicular to the
curve. This motion of the blade or knife is likewise also carried out automatically by
the machine.
an
By
In the accompanyings, Fig. 1. is a front view, and Fig. 5, is a plan of the machine,
Figs. 2 & 3 are respectively a left and a right sectional and elevation. Fig. 4, is a
section on line of Fig. 5. The oval describing mechanism erected upon the
foundation plate a' consists of the oval former capable of sliding between guides and
provided with a nut in which turns the screw e by means of a suitable crank handle
adapted when required to the square end e¹ and not shown on the drawing.
turning the handle the former may he moved to the right or left hand side for the
adjustment of the excentricity of the curve. Upon the former b turns the ring c
with its sliding sides or checks ce between the cheeks, cis arranged to oscillate.
Upon the centre of the former a central sliding piece d in a longitudinal slot of
which is mounted the revolving T piece g, the latter being set in motion by the bevil
wheels, g¹ g². The above well known oval describing mechanism, or any other similar
mechanism of known construction, is used to impart to the central piece d an oval
motion which is also followed by the axis d and communicated to the front part of
the horse shoe piece h guided behind at h¹. The metal sheets or plates are firmly
clamped between the holders, i by turning the crank handle. To reduce to a
minimum the friction developed between the holder and the steel ring k, a number
of antifriction steel balls (Fig. 4) are placed between the two. The blade carrying
saddle can be moved to and fro, whether the machine is working or standing still,
by means of the band wheel 1, toothed wheel and rack rod 13. The shaft in
carrying the circular blade m. is driven by means of the pulley m², grooved rod n and
coupling o. The lower circular blade m³ can moreover receive a motion from the
blade m. whenever required. The oscillation of the blades for obtaining a tangential
cutting direction is automatically effected by the horse shoe piece h. the exentric
motion whereof is carried out by means of the links p and q. the lever the axis s
the lever t the link u and the rackrod, and imparts a to and fro motion to the food
plate of the saddle 7 having the form of a toothed rector and gearing with the
rackrod v.
The motion of the oval describing mechanism is carried out by means of the
shaft driven by the front toothed wheels a.y.yl and z. such motion being transmitted

page_text: through the bevil wheels, to the T piece g. The two front wheels y, y are
Joosely mounted upon their shaft and carry at the sides the leather washers, which
form the friction coupling for the two wheels. When the rotary speed is too great
for large size, metal sheets or plates the two wheels come in contact, so that the
wheel revolves at a lesser speed than the wheel y', the rotary speed of the metal
sheet or plate, being accordingly reduced.
On cach revolution of the oval describing mechanism, the projection c³ formed upon
the sliding cheek, strikes the hook a¹ of the disconnecting rod which is thereby
drawn to, and moves the lever b, and thereby the sliding piece provided with a
disconnecting forked piece 3. in consequence whereof the clutch half connected
with the pulley m² is drawn away from the other half m, the toothed wheel a and with
it, the machine coming to a stand still.
With further reference to Figs. 4 and 5, of the patent drawing when the T piece g
(which is actuated by the bevel wheel g¹) iurns, the upper arm piece of (while
resting in a groove of d) turns the central sliding piece d. As d however is placed
between the sliding cheeks which are perpendicular to the direction of the arm
piece of g and which are capable of turning upon the circular ring b, the consequence
will be that d shall turn upon itself and likewise upon.b together with the checks c¹ c²,
d describing a curve which is an ellipse as science ieaches.
When the centre of comes to be in the centre of g. the ellipse becomes a circle.
As can be shifted by the screw e, the centre of b can be set in accordance with the
desired excentricity.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed 1 declare that what
I claim is.
1. An automatic machine for cutting oval shaped metal pieces in which the oval
describing mechanism (b, c, d d, g) and one or both boxes, of the blades have a
common driving gear ², so as to cause the said blades to rotate at an uniform speed.
The transmission of the motion to the above mechanism being effected by means of a
friction coupling y'y in order to obtain automatically accordingto the increased power
required, that is to say, when sheets or plates of large size have to be cut, a decrease
in the rotary speed of the sheet or plate caused by a coupling disc being set in action
at each increase of such rotary speed, substantially as and for the purpose set forth.
2. In the oval describing mechanism above claimed, an automatic disconnecting
device, the rod of which is moved, after a complete revolution of the metal sheet or
plate,c,fixed to the side or cheek of the central piece d. substantially as and for the
purposes set forth.
.
3. In the cutting mechanism, above claimed. the oscillation of the blades carried out
by the rotation of the saddle piece / effected by the horseshoe piece 7 with the aid of
the link P. rod g. lever . axis s. levert, rackrod and toothed sector, substantially
as and for the purposes set forth and described.
Dated this 23rd day of September 1889
HUGHES, SON & Co.,
38, Chancery Lane, Agents.