IMPROVEMENTS IN COINING PRESSES
Year: 1885

page_text: I, JAMES MURDOCH NAPIER of York Road Lambeth in the County of Surrey
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
COINING PRESSES to be as follows:-
My improvements refer to lever coining presses.
I employ an arrangement for feeding the blanks to be coined to the dies in such
manner that each blank in succession is moved from the reservoir or hopper and is
placed in position so as to be again moved towards the dies on the succeeding
revolution of the press either directly to the dies or to a second stage in advance
and thereafter on the next following revolution to the final stage and on to the
lower die ready to be impressed.
By the employment of this arrangement I am enabled to divide the distance
which the blank has to be moved from the hopper to the dies into stages and so
reduce the travel of the blank for each revolution of the press and thus obtain
greater speed of working as the actions used for the feeding of the blanks become
shorter.
The blank is fed from the hopper to its first stage on to a platform which is at
a lower level than the level of the die on which it is ultimately to be placed and
when the feeding slide has returned to its outward position to receive the next
blank the platform rises with the blank which is received into a suitable hole or
hollow in the slide in which it remains as it moves forward towards the dies. This
hole or hollow may be covered or partly covered to prevent the blank escaping
from its position in the slide until it arrives at the next stage when the slide has
attained its full travel inwards towards the dies and the blank at that point rests
upon another platform which descends with it and allows the slide to return over
it when the blank is immediately raised into a more forward partly covered hole or
hollow in the slide by the rise of the platform upon which it rests and by the next
forward movement of the slide the blank is carried to its final stage on to the lower
die the descent of which lowers the blank so that the front part of the slide can
pass back over it. These actions may be arranged with two feeding slides combined
and acting together in the same sense the one to pass the blank to its first stage or
resting place on the lower level and the other to receive it and pass it to its second
stage in one of its hollows and then to receive it into its second or forward hollow
and pass it on to its final stage on to the lower die. Or two separate feeding slides

page_text: may be used working at right angles and in concert the one with the other, the one
passing the blank from the hopper to the first stage and the other passing it
onwards as already explained to the final stage on to the lower die.
To prevent damage to the press in case of overstrain by accident or otherwise
. I provide a safety breaking connection between the fly wheel and the main shaft
which will give way and allow the fly wheel to turn on the shaft should an
excessive strain arise. This safety breaking piece is contrived with an adjustable
rest which can be set to position so as to vary the leverage and cause the piece to
break on a suitable and desired strain being applied such strain being more than
sufficient to accomplish the work required but insufficient to do damage to the press
in case of an abnormal obstruction arising in its working in which case the safety
piece is intended to give way. I provide a spring attachment which on the
accasion of the safety piece breaking separates the broken parts to prevent their
coming into contact when the fly wheel revoles free upon the shaft after the
breakage of the safety piece.
While by the means just explained I prevent damage arising to the press
generally by overstrain of the parts I provide abutment pieces on the main head
or frame of the press with means of adjustment so arranged as to prevent the dies
from coming together and being damaged in the case of no blank being placed
between them when the press is in action.
In order to reduce the wear and tear in the lever and toggle joints consequent
upon the pressure necessarily exerted in the operation of coining I employ
alternately parts of phosphor-bronze and steel working together especially in
presses so arranged that a large surface is provided to support the strain as by such
means the friction is diminished and more complete lubrication can be maintained..
Dated this 4th day of February 1885
;
CARPMAEL & Co.,
Agents for the Applicant.

page_text: I JAMES MURDOCH NAPIER of York Road Lambeth in the County of Surrey
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 improvements refer to lever coining presses. I employ an arrangement for
feeding the blanks to be coined to the dies in such manner that each blank in
succession is moved from the reservoir or hopper and is placed in position so as to
be again moved towards the dies on the succeeding revolution of the press either
directly to the dies or to a second stage in advance and thereafter on the next
following revolution to the final stage and on to the lower die ready to be
impressed.
By the employment of this arrangement I am enabled to divide the distance
which the blank has to be moved from the hopper to the dies into stages and so
reduce the travel of the blank for each revolution of the press and thus obtain
greater speed of working as the actions used for the feeding of the blanks become
shorter.
The blank is fed from the hopper to its first stage on to a platform which is at a
lower level than the level of the die on which it is ultimately to be placed and
when the feeding slide has returned to its outward position to receive the next
blank the platform rises with the blank which is received into a suitable hole or
hollow in the slide in which it remains as it moves forward towards the dies. This
hole or hollow may be covered or partly covered to prevent the blank escaping
from its position in the slide until it arrives at the next stage when the slide has
attained its full travel inwards towards the dies and the blank at that point rests
upon another platform which descends with it and allows the slide to return over
it when the blank is immediately raised into a more forward partly covered hole or
hollow in the slide by the rise of the platform upon which it rests and by the next
forward movement of the slide the blank is carried to its final stage on to the lower
die the descent of which lowers the blank so that the front part of the slide can
pass back over it. These actions may be arranged with two feeding slides combined
and acting together in the same sense the one to pass the blank to its first stage or
resting place on the lower level and the other to receive it and pass it to its second
stage in one of its hollows and then to receive it into its second or forward hollow
and pass it on to its final stage on to the lower die. Or two separate feeding slides
may be used working at right angles and in concert the one with the other the one
passing the blank from the hopper to the first stage and the other passing it
onwards as already explained to the final stage on to the lower die.
To prevent damage to the press in case of overstrain by accident or otherwise
I provide a safety breaking connection between the fly wheel and the main shaft
which will give way and allow the fly wheel to turn on the shaft should an
excessive strain arise. This safety breaking piece is contrived with an adjustable
rest which can be set to position so as to vary the leverage and cause the piece to
break on a suitable and desired strain being applied such. strain being more than

page_text: sufficient to accomplish the work required but insufficient to do damage to the press
in case of an abnormal construction arising in its working in which case the safety
piece is intended to give way. I provide a spring attachment which on the occasion
of the safety piece breaking separates the broken parts to prevent their coming into
contact when the fly wheel revolves free upon the shaft after the breakage of the
ɛafety piece.
While by the means just explained I prevent damage arising to the press
generally by overstrain of the parts I provide abutment pieces on the main head or
frame of the press with means of adjustment so arranged as to prevent the dies
from coming together and being damaged in the case of no blank being placed
between them when the press is in action.
In order to reduce the wear and tear in the lever and toggle joints consequent
upon the pressure necessarily exerted in the operation of coining 1 employ
alternately parts of phosphor bronze and steel working together especially in
presses so arranged that a large surface is provided to support the strain as by such
means the friction is diminished and more complete lubrication can be maintained.
In order that my said invention may be most fully understood and readily
carried into effect, I will proceed to describe the drawings hereunto annexed.
.DESCRIPTION OF THE DRAWINGS,
Figures 1 and 2 represent the arrangement referred to in which two feeding
slides are combined and act together in the same sense the one to pass the blank
from the hopper to its first stage or resting place on a platform at the lower level
and at the other to receive it from the platform into one of its hollows and pass it
to its second stage on to a second platform from which the blank is received into a
second and forward hollow in the slide and is passed on to its final stage on to the
lower die.
A is the hopper in which blanks B are placed. The feeding slides C and D are
shown fixed to the arm E through which they receive together a suitably timed
reciprocating motion in the same sense to and from the die F.
The feeding slides are shown in their extreme outward position from the die.
G is a fixed base plate over which the feeding slides work. In this plate are
two circular holes à a in which the two platforms 61 62 fit freely. These
platforms are caused to rise and fall together by their attachment to the cross bar H
which may receive motion from a cam on the main shaft of the press through
suitable connections.
In the position indicated the two feeding slides C and D are supposed to have
just completed their outward stroke-the platforms b¹² now rise to a level with
the top of the base plate G and wait in that position for a short time until the
feeding slides have moved forward and in case there may have been blanks on the
platforms they will have been received into the hollows c c of the slide D and
will be carried forward with it-As soon as slide D has carried the blanks far
enough along to render them independent of the support of the platforms 61 62
they fall to their first position as indicated and by that time the slide C having
reached a forward position immediately pushes the lowest of the blanks from
under the hopper on to the platform -This blank is raised by the action of the
platform into the hollow c¹ in slide D, as soon as the slide arrives in its outward
position or that in which it is shown in the drawing and by the next forward
movement of the slide is carried on and deposited upon the platform be; on the
slide again retiring to its outward position the blank which was deposited on
platform b², is raised by the action of the platform into the hollow c² in slide D
which in its next forward movement carries the blank as far as the die F the
descent of which lowers the blank so that the front part of the slide can pass back
over it. In its passage to the die F the blank passes over and is supported by the
collar plate F¹ and collar F2. On the next forward movement of the slide D which
takes place after the last.blank placed on the die. F has been coined the front. parf

page_text: of the slide D displaces the finished coin from the die before the next blank is
placed upon it.
It will be understood that the various operations above described in the passage
of a blank from the hopper A to the die F are repeated at each go and come action
of the feeding slides.
The holes or hollows for the blanks in slide D have thin ring covers c³ c³ to
prevent the blank escaping from its position in the slide. The slides C and D in
these figures being rigidly connected may be regarded as one slide.
Figures 3, 4 and 5 illustrate that form or arrangement of my invention referred
to in which two separate feeding slides are used working at right angles and in
concert the one with the other the one passing the blank from the hopper to the
first stage and the other passing it onwards to the final stage on to the lower die.
In these figures the same indicating letters as are used in Figures 1 and 2 are
made to serve for similar parts and the description already given in respect of
Figures 1 and 2 leaves little to be added to make this alternative arrangement
clearly understood. The slide D is formed to be attached to an actuating part of
the press at D¹ and as it is moved to and fro the feeding slide C is operated through
the bell crank lever I and connecting rods J and K which form an attachment
between the two feeding slides C and D so that when D is worked C is caused to
operate in unison with it.
These feeding arrangements are very suitable for rapid action for the following
reasons,
(a) The movement of the feeding slides or instruments is very much shorter and
therefore requires less time than when the blank is conveyed at one operation from
the hopper to the die.
(b) During a large portion of the stroke the blanks are free to descend in the
hopper and ample time is thus allowed for them to come to rest.
(c) The blank is boxed in during its travel from the hopper to the die and
cannot escape from the feeding slide however rapidly the movements are performed.
Figures 6. 7 and 8 illustrate the arrangement described of my safety breaking
piece for insuring the press against damage in case of overstrain and accident.or
otherwise. I is the safety breaking piece one end of which is held in a casting M
part of which only is shown supposed to be fixed to the fly wheel of the press
while the other end is held in a casting N part of which only is shown, supposed
to be fixed to the main shaft of the press so that the piece L forms a driving
connection between the fly wheel and the main shaft.
The driving band in this case should operate upon a pulley fixed to the fly wheel
which will turn in the direction indicated by the arrows.
The plates O and P which are fastened respectively to M and N serve to keep
piece L in position. d is an adjustable rest or abutment against which the
breaking piece L is forced at d. This abutment piece can be adjusted to some
extent to suit the required breaking strain by moving it in and out, that is nearer
or further from the part formed in piece L at which it is to break. The screws (d²
serve to fix the abutment piece in the position desired. The spiral spring e placed
in a recess in casting N and which is under compression operates against the slide
piece c which is guided at one end in the spring recess and at the other in the
plate which is fastened to casting N. This slide piece has a projecting part e²
which operates against a similar projection at the end of the breaking piece L so
that when the piece L breaks, the part held in casting 'N is withdrawn by the
action of spring e until it comes against the plate Q and thus the broken parts of
piece L are separated.
Figure 9 illustrates the manner in which I apply adjustable abutments to prevent
injury to the dies.
R is the main head or frame of the press and S is the upper die which it carries.
T is the moving table carrying the die U.
rare abutment pieces on the part R and tare adjustable abutment wedges on
the part T.

page_text: When the press is at work so long as blanks are supplied between the dies the
parts and do not come into contact but when no blank is there the parts r
and t meet and prevent the dies doing 80-When this takes place there is less
strain on the press than when coining as the dies are allowed to approach nearer
together.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
(1.) The arrangement of the feeding apparatus of coining presses in such manner
that the blank is taken in stages from the hopper to the die the feeding slide or
instrument depositing the blank at an intermediate stage and returning and the
blank being carried on to the die by a subsequent movement or movements of the
same or another feeding slide or instrument.
(2.) The arrangement of the feeding apparatus of coining presses in such manner
that the blank is taken by the feeding slide to an intermediate stage then lifted
into a cavity in the same or another feeding slide by which it is carried forward
towards the die.
(3.) The arrangement of the feeding apparatus of coining presses in such manner
that the blank is taken by the feeding slide or instrument on to a moveable
platform which receives the blank and permits the feeding slide or instrument
to return and in returning to pass over the blank so placed on the moveable
platform.
(4.) The arrangement of the feeding apparatus of coining presses in such manner
that the blank is taken by the feeding slide or instrument from the hopper on to a
moveable platform which then. places the blank in a covered cavity in same or
another feeding slide or instrument by which it is carried forward towards the die.
(5.) Feeding apparatus of a coining press substantially as described and
represented in the annexed drawings.
(6.) The improvement in coining presses consisting in providing a safety
breaking piece between the fly wheel and the main shaft of the press with an
adjustable rest or fulcrun by which the breaking strain may be adjusted.
(7.) The improvement in coining presses consisting in providing a safety
breaking piece between the fly wheel and the main shaft of the press and a
spring which retracts a portion of the breaking piece when the fracture occurs.
(8.) The improvement in coining presses consisting in providing abutment
pieces as described preventing the dies from meeting when no blank is supplied
between them.
(9.) The improvement in coining presses consisting in the arrangements illustrated
by Figures 6. 7 and 8 of the annexed drawings.
Dated this 4th day of December 1885