COMPLEIE OF DUITIVATION Improvements in or connected with Swaging or Stamping Machines, Shearing Apparatus, Eccentric Presses, and the like.
Year: 1898

page_text: Date of Application, 13th Sept., 1898-Accepted, 23rd Dec., 1898
COMPLEIE OF DUITIVATION
Improvements in or connected with Swaging or Stamping Machines,
Shearing Apparatus, Eccentric Presses, and the like.
I, NORBERT SPERBER, of Goeppingen, Wurtemberg, in the Empire of Germany,
Technologist, 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 relates to a peculiar arrangement in swaging or stamping
machines, shearing apparatus, eccentric presses and like metal working machines
with crank driving gear, with the object of doubling the depth of the swaging
or the like with the same throw of the crank and consumption of power, or with
a similar depth of swaging of diminishing the power consumed to one half.
The arrangement consists for instance in the case of swaging or stamping
machines or presses, of counter cranks mounted on the shaft of the press, one
pair of which cranks is connected with the table and the other with the stamp
guide, whilst the sheet metal holder is freely movable. By this means with an
equal throw of the crank and consumption of power double the swaging depth is
obtained as would be the case with a single crank, or with half the amount of
power an equal swaging depth is obtained. As the resistance between the punch
and die or swaging blocks is absorbed by the cranks and crank rods, the uprights
and bed plate are relieved of pressure and the former serve merely for guiding the
parts travelling between them thus allowing of a much lighter construction of
same. The gripping and retention of the sheet metal is in this machine effected
by means of toggle-like links. These are arranged in such a way that when in
position for work, the table, the plate or sheet metal holder, and the toggle links
form a whole and are movable, as a whole, whilst in the ordinary elbow lever
sheet metal holding devices hitherto employed either the table or the plate holder
was fixed. These plate holders also differ from the known apparatuses by the
toggle links in this case having only to endure the pressure between the tablo
and the plate or sheet metal holder, whilst hitherto the elbow levers had to receive
the pressure of the stamp or punch and also that of the plate holder, so that in
the present invention the cranks are relieved of this load. The pressure on, or
gripping of, the sheet metal (or metal plate) is attained and regulated in the
simplest manner by adjusting the table itself by means of a worm and worm
wheel.
In the accompanying drawings, a double crank arrangement with toggle-like
plate holding device is shown in connection with a heavy swaging press.
Figure 1 is a vertical longitudinal section;
Figure 2 a side view in vertical section;
Figure 3 a horizontal section;
Figures 4 and 5 are diagrams of simpler double crank arrangements such as
may be employed for swaging or stamping machines or presses of medium or less

page_text: The machine consists essentially of a crank shaft C mounted in a frame J and
operated by cog wheels r R and R and connected by means of connecting
rods H with a table G travelling between the uprights K and by means of con-
necting rods B with a stamp guide A on which the sheet or plate holder P is
suspended by means of bars p¹² and pressed downwards by means of springs w.
The sheet or plate holder P is adjustably connected with the table G by the double
toggle-like links S S in such a way that the free ends of the shorter links of
the toggle are firmly connected with the holder P by pins and those of the
longer links with the table by means of pins u.
Before the machine comes into action the cranks c¹ stand in the lowest position
and the cranks c in the highest. When the sheet metal disc W lying on the
tool M is to be stamped or swaged the cranks c move in the direction shown by
the arrow, Figure 2, upwards with the table G and the cranks c downwards with
the stamp guide A, plate holder P, and tool p attached to the latter, whilst the
toggle links S S which are extended and are in connection with the table G
and plate holder P are shortened above until the crank assumes a position of 90°.
At this point as shown in the drawing the tool p attached to the plate holder P
rests on the plate and the latter in turn rests on the tool M and the plate is then
gripped by means of the toggle links S having rollers which engage between
guides k, whilst the stamp 1) mounted on the stamp guide A and adjustable by
means of a screwed spindle d, still stands somewhat above the sheet metal disc W
(Figure 1). By a further rotation of the double crank shaft C again to 90° the
disc is swaged, and on a further rotation of 90° the stamp guide A. moves upwards
whilst the plate holder P, table G and tools p and M also toggle links S descend.
In the position of 270° of the cranks the toggle links S or rather their rollers o
emerge from between the guides and extend downwards together with tha
table G and tool M whilst the plate holder P and tool p is carried along with the
stamp guide A by means of the rods on the further rising of the said stamp
guide, until the highest position is reached when the operation recommences
afresh. The necessary pressure between the tools and M is regulated by an
adjustment of the table G by means of a worm n and worm wheel N, Figure 1.
The adjustment takes place in the following manner:-
A bush N provided with an internal thread is revolubly mounted in the
table G, on which thread a worm n engages. The support on which the plate
holder is fixed is mounted in the thread of said bush N. If the latter be then
rotated by the worm n the support for the tool M is raised or lowered and the
latter moves with it.
The sheet metal disc W is held between the tools M and p in the following
way.
The disc holder P on which the upper tool is fixed is connected with the
table Gas shown in the drawing by means of toggle links S s. The longer
arms S are attached below to a pin and secured to the table G whilst the
shorter armis s are attached below to pins u' attached to the disc holder P. The
links Ss are flexibly connected with one another on the pins of the rollers o.
When the operation commences the table G is raised and the disc W lying on
the tool M presses against the tool p and lifts it together with the loosely lying
disc holder P which is held in bars p'. Hitherto the disc Wi has only been held
by the weight of the holder P and its belongings. In order that the disc may be
still more firmly held and the holder P still more strongly pressed against the
disc, the toggle link arrangement is employed in combination with the vertically
adjustable tool M.
In the upward movement of the table G together with the tool M for holding
the disc firm and the disc W lying thereon the upper disc holding tool p is first
raised together with its disc holder P, and then the rollers o of the toggle links S s
enter the guides k, whereby they approach one another by the lower inclined or
oblique surfaces of said guides until they extend or run up into vertical surfaces.
On the two rollers o approaching one another as the length of the links S s is

page_text: unalterable the pin u¹ is forced downwards that is to say the disc holder P or
rather its disc holding tool p is pressed strongly against the disc W.
It is only necessary in the case of thicker or thinner discs, as the guides k for
the rollers o are not adjustable to make the lower tool M vertically adjustable.
As otherwise in the case of thicker discs for instance the rollers would come too
soon under the guides k.
Two cranks or even only one crank according to the power of the swaging press
may be employed for operating each tool or swaging block. For instance in
Figure 4 two cranks are employed for moving the table and only one for the
stamp whilst in Figure 5 only one is employed for each of the two tools.
The ejection of the swaged piece takes place by means of an ejector E to be
employed as required and adjustable in height by means of a spindle e, the
ejection being made through an opening provided for the drawn pieces.
The advantages of these double crank swaging presses as compared with other
ones at present known are as follows:-
a) A double swaging or stamping depth with an equal consumption of power
so that great depths of swaging are attainable with ease without the machine
being raised in price in proportion to output.
b) With an equal swaging depth, half the consumption of power, so that double
the number of strokes is possible and double the daily delivery is obtained, and
this delivery may be increased by the provision of the discharge orifice for the
pieces and the ejector almost to one half more so that almost three times the
delivery of the ordinary presses is attained.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
1. A counter crank arrangement for swaging or stamping machines, shearing
apparatus, eccentric presses and the like, characterised by the table being pro-
vided with one or more cranks and the stamp guide being connected with one
or more counter cranks whilst the plate or sheet metal holder is freely movable,
but on the rise of the stamp guide after a certain distance has been traversed is
lifted with it, substantially as hereinbefore described.
2. In a counter crank arrangement such as described for swaging or stamping
machines, shearing apparatus, eccentric presses and the like, a double toggle-like
link gear freely movable with the table and plate holder and only receiving the
pressure of the plate holder, the links of said double toggle being so connected
with the table and plate holder that when in an extended position they form a
movable whole therewith, substantially as herein before described.
1
1900
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.