Improvements in Punch-drawing Machinery.
Year: 1890

page_text: Date of Application, 29th May, 1890
Complete Specification Left, 25th Feb., 1891-Accepted, 25th Apr.,
1891
PROVISIONAL SPECIFICATION.
Improvements in Punch-drawing Machinery.
I, HARRY SHOOSMITH, of The Lion Works, Witton, in the County of Warwick,
Engineer, do hereby declare the nature of this invention to be as follows:-
:-
My invention relates to machines for making cartridge cases and like articles by
means of a punch forcing the metal into and through a die, and the object which I
have in view is to render more rapid the action of the machines by which such
punch-drawing is effected. For this purpose I arrange the die in such a manner
that, immediately on the punch being withdrawn, it is removed to a position at
some distance from the punch, allowing room for a fresh blank to be introduced in
its turn to be operated on. In order still farther to abridge the time occupied in
punch-drawing, I attach to a reciprocating crosshead two punches, projecting on
opposite sides of the crosshead, and I fix two dies in position to be entered, one by
each of the punches as the crosshead reciprocates, so that while the one punch
is entering the die on the one side, the other punch is leaving the die on the
other side.
110-1.800-
ABEL. & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Punch-drawing Machinery.
I, HARRY SHOOSMITH, of The Lion Works, Witton, in the County of Warwick,
Engineer, 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 :-
My invention relates to machines for making cartridge cases and like articles by
means of a punch forcing the metal into and through a die, and the object which I
have in view is to render more rapid the action of the machines by which such
punch drawing is effected.
For this purpose, I arrange the die in such a manner that, immediately on the
punch being withdrawn, it is removed to a position at some distance from the punch,
allowing room for a fresh blank or partially punched tube to be introduced and in
its turn to be operated on.
In order still farther to abridge the time occupied in punch drawing, I attach to
a reciprocating crosshead two punches projecting on opposite sides of the crosshead,
and I fix two dies in position to be entered, one by each of the punches as the cross-
head reciprocates, so that while the one punch is entering the die on the one side, the
other punch is leaving the die on the other side.
and
Fig. 1 of the accompanying drawings is a longitudinal section, partly in elevation,
Fig. 2 is a plan of a duplex punch drawing machine according to my invention.
Figs. 3 and 4 are transverse sections of the bed shewing in elevation the end frame
and the travelling crosshead or saddle respectively,
Fig. 5 is a vertical section shewing the die raised and
Fig. 6 is a front view and section on X of the die.
Fig. 7 is a vertical section and
Fig. 8 a front view of the stop or extractor slide for withdrawing the drawn case
the unch
.

page_text: A is the bed of the machine having at its ends strong frames B B₁ carrying
dies C C¹ fitted to slide vertically between guides. On the bed A is fitted to slide
to and fro a saddle D this movement being effected by screws E with reversing
gear acting in the well known manner, as for the table of a planing machine. On
Both sides of the saddle D are attached punches P P1, and two sets of guide rods RR.
A sliding tappet rod T on each side is connected at each end by links having pins
working in slotted holes with bell crank levers linked to the ends of crossheads H. H'
the middles of which are connected to the dies CC which when free descend by
their own weight, but are alternately raised, as the saddle D approaches each end
of its stroke, by brackets projecting from the saddle acting on the tappets of the
rods T.
As shewn in Figs. 7 and 8 on an enlarged scale, there is attached to the back of
each die a vertical slide F which is latch shaped at the top and is urged upwards
by a spring as far as permitted by a stop stud on each side working in a slotted
hole. The machine is worked in the following manner.
Assuming that the saddle D is approaching its extreme position to the left, then
by the movement given to the tappet rod T the right hand die C is raised leaving
the hole through B quite open so that a blank or partly drawn tube G that has to
be farther drawn is pushed through the hole of B on to the punch P. The saddle I)
now moving towards the right, the die C descends in front of the punch P and
blank G and the guide rods R pass into holes e c slightly trumpet mouthed of the
dic, as shewn in Fig. 6, fixing the die accurately in position. The punch P now
continuing its advance, pushes the blank G through the die, the slide F being
depressed by the blank bearing on the slope of its latch end. When the stroke is
completed, the blank or tube G being carried quite beyond the die to the right,
the slide springs up behind the end of the tube and as the punch P retreats
towards the left, the end of the tube G butts against the back of F which holds
the tube stationary until the punch is drawn quite out of it. The tube G can then
be removed, and the die C being raised, a fresh tube can be introduced and placed
on the punch.
Instead of effecting the lifting of the dies C C by means of the tappet rod T
and its connections, they may be raised by a suitable crane or other lifting gear
applied as illustrated by Fig. 5. The lifting gear is attached by a rod K to the die
holder, this rod having a screw thread on it made segmental by several chases cut
along the entire length of the thread. This rod passes through a nut L. which has
corresponding segmental internal screw threads and can be turned partly round by
a hand wheel. When the die has to be lifted, the nut L is turned to a position
such that its thread segments coincide with the chases of K, whereupon K can be
freely raised lifting the die, and lowered to restore the die to its operative position,
in which it is firmly held by partly turning the nut L so that its threads engaging
with those of K press K down.
Having now particularly described and ascertained the nature of this inven
tion, and in what manner the same is to be performed, 1 declare that what I
claim is
1. In a punch drawing machine, arranging the die so that it is withdrawn from
in front of the punch, allowing a blank or tube to be placed upon the punch,
substantially as herein described.
2. The construction and arrangement of duplex punch drawing machine, having
a saddle with punches projecting from both sides of it, travelling to and fro between
end frames holding dies, substantially as described.
Dated this 25th day of February 1891.
ABEL & IMRAY,
Agents for the Applicant.