Year: 1888

page_text: Articles.
I, GEORGE DUNHAM of Unionville in the County of Hartford, and State of
Connecticut, United States of America, Manufacturer, 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 improvements in machines for making nuts, washers, or
analogous articles, and the objects of my improvements are to improve the efficiency
of the machine, particularly the manner of holding the bar, clearing the scrap from
the dies, and holding and guaging the nut blanks.
In the accompanying drawings
-
Fig. 1. is a front elevation of my machine..
Fig. 2 is a horizontal section of said machine on line ---x of figure 1 with one
holding cap any other parts removed.
Fig. 3 is a side elevation of my machine with the driving shaft in section.
Fig. 4 is an enlarged vertical section of a portion of said machine on line y ---y of
fig. 2.
Fig. 5 is a vertical section of a portion of said machine on the line --- of
figure 4.
Fig. 6 is a plan view of the devices for holding the bar, the plate or cap to which
they are attached being indicated by broken lines.
Fig. 7 is a rear elevation of said devices for holding the bar and the plate to which
they are attached.
Fig. 8 is a horizontal section on line w---w of fig. 9 of the slide which carrios the
punches, together with the portion of the frame.
Fig. 9 is a side elevation of said slide with a vertical section of a portion of the
frame, and
Fig. 10 is a plan view on a still larger scale of the several dies and connected parts.
The machine herein illustrated and described is an improved form of the nut
machine shown and described in the United States Patent to George M. Dunham,
No. 386805 dated July 31st, 1888.
The slide A bearing a round punch 1, fig. 9, a blanking punch 2, and two trimming
punches 3, is reciprocated in suitable ways by a crank or eccentric on the main shaft B

page_text: as in ordinary machines. A die bed C contains a stationary shear blade4ngs.
and 10, for acting against one side of the blanking punch 2, the round die a fig. 2, for
the punch 1, two trimming dies 55 for the trimming punches 33, and a crowning die 6
Moving transversely over the
which acts in opposition to the blanking punch 2.
face of the die bed is the carrier or transfer D containing two right angular notches, 5
the side wall of which that is parallel to the shear blade 4 acts in opposition to said
blade for severing the blank from the bar under the action of the punch 2. The side
walls of the notches which are at right angles to the blade 4 and which form the middle
projection of said carrier D serve to carry the nut blank to the right or to the left, to
present said blank to the trimming dies 55. This carrier D may be reciprocated by
any suitable mechanism, but I prefer to operate it by means of the slides 77 and their
cams & 8 as more fully shown and described in my United States Patent of January 24th
1888 No. 376769, for a Mechanical Movement. These parts are all substantially as
shown and described in the aforesaid Patents and therefore I consider it unnecessary
to describe them more specifically excepting as they may be referred to in connection
with my improvements.
The lower end of the slide A 1 mount in horizontal ways 99 figs. 1 and 9, so as to
make the punches move bodily toward and from the front by means of the adjustable
screws 10 10 and 12 12 figs. S and-9.. I also attach this lower part of the slide A to
the upper part by means of the bolts 11, 11, figs. 1 and 9, which bolts pass through
slots as indicated by the broken lines in fig. 1. Upon each side of the lower part of
the slide are laterally adjusting screws 13, 13, passing through lugs on the main
portion of the slide as shown, whereby I am enabled to adjust the lower end of the
slide laterally, when the bolts 11, 11 are loosened. Thus it will be seen that I am
enabled to adjust all of the punches bodily to and from the front, and laterally to
either side.
E designates a holding cap or plate or take-off through which the round punch 1
passes, and underneath which is a groove or channel through which the bar is fed for
feeding the dies. Projecting from the front edge of this plate there are two wings b
bevelled at their front end, and underneath which the cutting portions of the carrier D
reciprocate. Back of these wings I arrange a pair of holding jaws cc, said jaws being
pivotted to the plate E and pressed apart at their rear end by the spring d, whereby
their front ends are continually pressed against the sides of the bar to hold it firmly as
well as to centre and guide it.
The round hole for the centre of the nut is first pressed and then as the bar is fed
along to a position over the crowning die 6, a blank is severed therefrom by means of
the blanking punch 2 acting against the blade 4 upon one side and the parallel wall of
the notch in the carrier D'on the other side so as to cut a blank from the bar and trim
a slight portion from its outer end. That portion of the carrier D which in connection
with the shear blade 4 acts as a blanking die is also further recessed as at ff shown
most clearly in fig. 10. In cutting the blank a small portion of the metal enters the
recess and thereby prevents the blank from jumping laterally away from the central
projection on the carrier. Upon the further descent of the blanking punch the under
side of the nut is crowned in the crowning die 6 and as the blanking punch retreats
the carrier 1) moves to one side to present the nut blank to one of the trimming
dies 5. In thus passing to the trimming die any scrap that may be on the top of the
carrier is forced against the bevelled end of one of the wings band by it is pushed
towards the front of the machine. When the carrier presents a blank to the trimming
These side guages are loosel
dies 5, said blanks are stopped by the side guages g.
held in place by screws passing through slots and pressed or held in position by th
springs h, thereby permitting said side guages to yield and move out of the way in cas
The inward movement of thes
a nut blank of an extraordinary width is presented.
side guages is limited and regulated by means of the screw pink fig. 4, the ends o
which strike against stop shoulders on the die bed C. When the trimming pune
descends to trim the blank and returns, the projection that filled or partially fille
the recess is trimmed off as scrap and the carrier moves back out of the way.
In connection with the trimming dies 5 I arrange clearers m which pass throug

page_text: slots or ways in the die bed C to the rear of the machine where they are connected by
a rocking arm n to the rock-shaft o. This rock-shaft is operated to work the clearers
by means of cam Facting upon lever G and which in turn acts upon the arm of the
rock shaft, said arm being pressed in the opposite direction by means of the spring ".
These clearers are by this mechanism reciprocated over the face of the trimming dies
to remove the scrap immediately after the trimming of each blank.
I have shown two blanking dies and a carrier which takes a blank in both directions,
but my clearers for the trimming dio may if desired be used in connection with a single
acting machine having only one finishing die. This will require only the omission of
the extra pinion for driving the slides 7 7 that reciprocate the carrier, and placing the
operating cams for said slides directly upon the main shaft so that the carrier will then
receive one reciprocating movement for every revolution of the shaft B. As illustrated
for a double acting machine, there is only one reciprocation of the carrier for every
revolution of the shaft B.
While I have shown my improvement as applied to a certain nut-machine, I intend
to apply such of my improvements as are adapted therefor, to other nut machines, or
machines for making washers or other analogous articles.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. In a nut machine, the slide A having its lower end adapted to hold several
punches and made separately from the main or upper portion of said slide and provided
with adjusting devices for adjusting the punches bodily to or from the front and rear
and also laterally, substantially as described and for the purpose specified.
2. In a nut machine having a groove or way for the rod or bar to pass through, the
combination of the jaws cc pivotted to the plate E upon each side of said way, and the
spring for pressing said jaws against opposite sides of the bar when passing through
said ways, substantially as described and for the purpose specified.
3. In a nut machine, the combination of the blanking punch and dies, one member
of said dies being formed on the reciprocating carrier, and the stationary wing b
bevelled at its outer end, substantially as described, whereby the movement of the
carrier under said wing frees the dies from scrap, as set forth.
4. In a nut machine, the combination with the blanking punch, the shear blade 4,
the reciprocating carrier having an edge parallel to that of said shear blade and in
connection therewith serving as the blanking die, said parallel edge having also the
holding recess f, substantially as described and for the purpose specified.
5. In a nut machine, the combination of the blanking punch and die, the trimming
die and punch, a carrier for transferring the blank from the blanking to the trimming
dies, and the yielding guage g substantially as described and for the purpose
specified.
6. In a machine of the class herein before specified, the combination of the punching
die and punch for the middle hole, the blanking die and punch, a carrier, à trimming
die and punch and a clearer m for removing the scrap from said trimming die, sub-
stantially as described and for the purpose specified.
Dated this 30th day of October 1888.