IMPROVEMENTS IN PRESSES FOR CUTTING OUT AND STAMPING UP SHEET METAL ARTICLES
Year: 1878

page_text: LETTERS PATENT to Alexander Melville Clark, of Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN
PRESSES FOR CUTTING OUT AND STAMPING UP SHEET METAL ARTICLES." A
communication from abroad by Eliphalet William Bliss, of Paris, France.
Sealed the 8th April 1879, and dated the 1st November 1878.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 1st November 1878.
ALEXANDER MElville Clark, of Chancery Lane, in the County of Middlesex,
Patent Agent.
"IMPROVEMENTS IN PRESSES FOR CUTTING OUT AND STAMPING UP
SHEET METAL ARTICLES." [A communication from abroad by Eliphalet William
Bliss, of Paris, France.]
This Invention relates to improvements in presses for cutting out, drawing, or
stamping up and embossing boxes and such like articles in sheet metal, and is
illustrated in the accompanying. Drawings, in which Figure 1 is a vertical section of
a press, the crank being at the upper dead point, and the top and bottom tools
separated for placing the work between them; Figures 2 and 3 are side and front
elevations of the same, the former being partly in section and showing the tools
closed together; Figure 4 is a section of the tools drawn to a larger scale. A is the
upper die or plunger for drawing out or stamping and embossing. It works within
a tubular punch B which cuts out and holds the blank. The bed tools are a
bolster Cand a hollow die D corresponding to B and A respectively, and E is a
lower die or plunger corresponding to the upper die or plunger A. The punch B
is attached to the tubular slide G whose descent is operated by the cams d, d,
Figures 1 and 3.
The die A is keyed at F to a follower H working up and down in slide G, the
key F being made to project through a slot F¹, Figure 3, in G, in order to prevent
the die A turning. The follower H is operated by the crank through the con-
necting rod T attached to H by a ball-and-socket joint W. The die E is attached

page_text: to a follower I operated by cams P, P¹, Figures 2 and 3, through the connections
O, M, crank shaft L, and toggle K, K¹.
The driving wheel of the main shaft is connected thereto by a self-acting coupling
shewn in Figures 5 and 6, the driving wheel being omitted; X is the main
shaft having a key seat to receive a half-round key f which projects beyond the face
of the wheel and also through a collar m and terminates in a small arm g of the
form shewn which is pressed outwards by a spring ħ into the position indicated in
Figure 6 Y-is-an-elbow-lever-connected_by_rod S to treadle S and maintained in
the raised position R, Figure 3, by a spring not shewn.
,
Figure 5 shews the position of the shaft when the press is stopped, the driving
wheel then turning loose on the shaft. When the treadle S is depressed the
lever Y is removed out of the way of arin which is then thrown out by spring h,
and thus-by-partially rotating the key f causes it to enter the part of. its seat that
is in the driving wheel which is then keyed fast on and rotates the shaft. On
|_ removing the foot from the treadle the elbow lever Y moves back again, and when
the shaft bas made a revolution, the arm g strikes against it, and returns the key to
its original position, whereupon the driving wheel is again loose ou-the-shaft, and
the press stops working.
The action of the machine is as follows:-The sheet metal being placed between
B and C and the press started by means of the treadle, the punch B descends first,
and cuts out and holds the blank firmly upon the upper face e¹ of D. At this
moment the die or plunger A descends, drawing out or stamping up the blank and
carrying it with it through D. The bottom die E then rises to meet the die or plunger
A in order to emboss the desired design. The relative positions of the tools at this
moment are shewn in Figure 2. The crank now passes its lower dead point and
raises die A, and the die E is at the same time returned to the position shewn in
Figure 1. During this upward movement of die A the cupped blank is drawn off
the said die A by its edges striking against the shoulders c', c', of the hollow
die D and falls out at Z, the inclined position of the press preventing it lodging on
the die E; when the crank reaches its upper dead point the clutch is thrown out of
gear and the press is stopped as before described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the 30th
April 1879.
ALEXANDER MELVILLE CLARK, of Chancery Lane, in the County of Middlesex,
Patent Agent. "IMPROVEMENTS IN PRESSES FOR CUTTING OUT AND STAMPING UP
SHEET METAL ARTICLES." A cominunication from abroad by Eliphalet William
Bliss, of Paris, France.
This Invention relates to improvements in presses for cutting out, shaping, or
stamping up and embossing boxes and such like articles in sheet metal, and is
illustrated in the accompanying Drawings, in which Figure 1 is a vertical section
of a press, the crank being at the upper dead point, and the top and bottom
tools separated for placing the work between them; Figures 2 and 3 are side and
and front elevations of the same, the former being partly in section and showing
the tools closed together; Figure 4 is a section of the tools drawn to a larger scale.
A is the upper die or mandrel for shaping or stamping up the box or other article
and embossing a design upon the bottom. It works within a tubular punch B
which first cuts out and then holds the blank in readiness for the die A to act on it.
The bed tools are a bolster. C and a hollow die D corresponding to B and A
respectively, and E is a lower die forming a counterpart of the upper die A. The
punch B is attached to the tubular slide G whose descent is operated by the
cams d, d, Figures 1 and 3. The die A is keyed at F to a piston or follower H
working up and down in slide G, the key F being made to project through the
slot F, Figure 3, in G, in order to prevent the die A turning. The follower H is
operated by the crank through the connecting rod T attached to H by a ball-and-
socket joint W. The die E is attached to a follower I operated by cams P, P¹,
Figures 2 and 3, through the connections O, M, crank shaft L, and toggle K, K';
N is a band pulley which also acts as a fly wheel, connected to the main shaft by a
self-acting coupling, shown separately in Figures 5 and 6; X is the main shaft
having a key seat to receive a key f (of the nearly cylindrical form shown in cross
section) which projects beyond the face of the driving wheel and also through
a collar m fixed to the boss of the said wheel, and terminates in a small
arm g, curved to the form shown, which projects just beyond the periphery of
collar m, and is pressed outwards by a spring into the position indicated in
Figure 6; Y is an elbow lever connected by rod S¹ to foot lever S and maintained
in the raised position R, Figure 3, by a spring not shown. Figure 5 shows the
position of the shaft when the press stops, the key f being then turned round so
that its flattened side coincides with the periphery of the shaft, thus allowing the
band wheel to turn loose on the shaft. When the foot lever S is depressed, the
lever Y is moved out of the way of arm g which is thrown outwards by spring h
thereby partially rotating the key fand causing it to enter the groove or seat made
for it in the boss of the band wheel immediately the same comes opposite to it,
whereupon the wheel is keyed fast to and rotates the shaft. On removing the foot
from the foot lever the elbow lever Y moves back again, and when the shaft has
completed the revolution, the arm g strikes against it and returns the key to its
original position, whereupon the driving wheel is again loose on the shaft and the
press stops working.
The action of the machine is as follows:-The sheet of metal being placed between
B and C, and the press started by depressing the foot lever, the punch B descends
first, and in conjunction with C cuts out the blank and then holds it firmly upon
the upper face e' of D. At this moment the die A descends and stamps up the
box body and carries it with it through D. The bottom die E then rises to meet
the die A in order to emboss the desired design upon the bottom of the box body or
other article. The relative positions of the tools at this moment are shown in
Figure 2. The crank now passes its lower dead point and raises die A, and the
die E is at the same time returned to the position shown in Figure 1. During this
.

page_text: upward movement of die A the cupped blank or box body is drawn off the said die
by its edges striking against the shoulders c', c¹, of the hollow die D, and falls out
at Z, the inclined position of the press preventing it lodging on the die E.
When
the crank reaches its upper dead point the clutch is thrown out of gear and the
press stops as before described.
It will be understood that the Invention is not limited to the precise form and
arrangement of press herein-before shown and described, as such may be varied
without affecting the chief features of improvement.
Having described the nature of the Invention, and-the-manner of performing the
same,-I-declare that what I claim as the Invention to be protected by the herein-
before in part recited Letters Patent is,―
1st. The improved press for cutting out, shaping, or stamping up and embossing
boxes and other articles in sheet metal, the chief features of which are the employ-
ment in an inclined framing of a set of top tools or dies A, B, working one in the
other, and a set of bottom tools C, D, E, also sliding one in the other; together
with their actuating mechanism, the whole substantially as and for the purpose
herein-before shown and described.
2nd. The means of coupling the driving wheel with the main shaft consisting of
a nearly cylindrical key f fitted to rotate in a seat in the shaft and engage in a seat
in the boss of the wheel, and provided with an arm g acted on by a spring hand
employed in combination with a lever y or its equivalent operated by a foot lever,
substantially as and for the purpose shown and described.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Thirtieth day of April, in the year of our Lord One
thousand eight hundred and seventy-nine.