Improvements in Punching Machines.
Year: 1890

page_text: Date of Application, 27th June, 1890
Complete Specification Left, 26th Mar., 1891-Accepted, 25th Apr.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Punching Machines.
We, JAMES SMITH and HUGH WILSON SMITH, of Kingston Engine Works,
Kinning Park, Glasgow, in the County of Renfrew, North Britain, Engineers,
do hereby declare the nature of this invention to be as follows, that is to say :-
Our said invention relates to punching machines of the kind in which the punch
is made to operate by means of a crank or eccentric; and our object is to facilitate
the placing of the metal that is to be punched accurately in position.
Punching machines of the kind referred to, whilst in some respects practically
superior to some other kinds, have the peculiarity that with an eccentricity of
the operating crank or eccentric suitable for the punching operation, the punch
is, on the return stroke, moved so far up or back that a space intervenes between
it and the metal that is to be punched, and it is in consequence difficult to
speedily shift or place the metal with the mark for the next punching accurately
under the centre of the punch.
In carrying out our invention we fix the socket in which the punch is held to a
frame or slide which is acted on by the crank or eccentric in an indirect manner;
and the parts are arranged so that on the return stroke of the crank or eccentric
the frame or slide is moved back not by the crank or eccentric but by a counter-
weighted lever, or by a spring, or by water or steam pressure acting in a cylinder,
and a stop is provided to limit the return movement so that the punch is moved up
or back only sufficiently far to allow of the shifting of the metal that is to be
punched.
In one
The precise details may be varied, the usual adjustable distance piece being
provided for throwing the punching apparatus into or out of action.
modification a rectangular block on the crank bears on the distance piece which is
held in an inner slide or frame fitted within the slide or frame carrying the punch,
and a small space or clearance betwen the two frames allows the inner one to move
further up or back than the outer one. In another modification the clearance is
between the block on the crank and the inner frame or slide. In other modifi-
cations the adjustable distance piece is fitted to the outer frame or slide; and in
others the clearance is obtained by elongating the aperture in the block on the
crank.
The mechanism may be arranged so that the punching action may take place in
a vertical, horizontal, or other direction.
Dated this Twenty-sixth day of June 1890.
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Punching Machines.
We, JAMES SMITH and HUGH WILSON SMITH, of Kingston Engine Works,
Kinning Park, Glasgow, in the County of Renfrew, North Britain, Engineers,
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, that is to say:—
Our said invention relates to punching machines of the kind in which the punch
is made to operate by means of a crank or eccentric, and our object is to facilitate
the placing of the metal that is to be punched accurately in position.

page_text: Punching machines of the kind referred, whilst in some respects practically
superior to some other kinds, have the peculiarity that with an eccentricity of the
operating crank or eccentric suitable for the punching operation the punch is, on
the return stroke moved so far up or back that a space intervenes between it and
the metal that is to be punched, and it is in consequence difficult to speedily shift
or place the metal with the mark for the next punching accurately under the
centre of the punch.
In carrying out our invention, we fix the socket in which the punch is held, to a
frame or slide which is acted on by the crank or eccentric in an indirect manner;
and the parts are arranged so that on the return stroke of the crank or eccentric the
frame or slide is moved back, not by the crank or eccentric, but by a counter-
weighted lever, or by a spring, or by fluid pressure acting in a cylinder and a stop is
provided to limit the return movement so that the punch is moved up or back only
sufficiently far to allow of the shifting of the metal that is to be punched, and
remains stationary during a portion of the movement of the crank or eccentric.
The precise details may be varied, the usual adjustable distance piece being
provided for throwing the punching apparatus into or out of action.
On an accompanying sheet of explanatory drawings some convenient examples
are shown of punching apparatus as made with our improvements.
Figure, 1, of the drawings is a sectional end elevation, Figure, 2, is a sectional
side elevation, and Figure, 3, is a sectional end elevation, of a double-ended.
punching machine, as provided with two modifications of our improved parts.
Figures, 4, 5, and 6, are vertical sections showing other modifications. In these
drawings the same reference letters are used to mark the same or like parts
wherever they are repeated.
In the modification shown in Figure, 1, and at the left-hand end of Figure, 2, a
rectangular block, B, on the crank, C, bears on the distance piece, D, which is held
in an inner slide or frame, F, fitted within the slide or frame, S, carrying the
punch, P, and working vertically in the usual manner in guides upon the fixed
framing of the machine. There is a small space, A, between the frame, F, and the
slide, S, which allows the frame, F, to move further up or back than the slide, S,
the return movement of which is limited by adjustable screw stops, T. The
distance piece, D, is fast on a horizontal spindle, G, which can move in slots in the
fixed guides, and which has hand levers, H, fixed on its ends. The inner frame, F,
is wide enough inside to allow of the transverse movement of the block, B, due to
the action of the crank, C.
The modification shown in Figure, 3, and at the right-hand end of Figure, 2,
differs from that already described in having the inner frame, F, arranged to move
transversely in the outer frame or slide, S, the distance piece, D, being also
movable transversely and being loose on its spindle, G, which turns it by means of
a feather, whilst the space, A, is between the block, B, and the inner frame, F.
In the modification shown in Figure, 4, the distance piece, D, is below the inner
frame, F, which bears and moves transversely on it, the space, A, being between
the block, B, and the inner frame F. This inner frame, F, has not its top in
contact with the top of the inside of the frame or slide, S, but is borne up by a pair
of blade springs, J, having their ends entered into slots in the slide, S, these
springs allowing the frame to be depressed by the crank when the distance piece, D,
is turned down.
In the modification shown in Figure, 5, the inner frame, F, is dispensed with, the
block, B, resting on the distance piece, D.
In the modification shown in Figure, 6, the space, A, is obtained by elongating
the aperture in the block, B, which block is borne up by springs, J.
In all the modifications the outer frame or slide, S, is raised up to the adjustable
stops, T, independently of the crank, C. As shown in Figure, 1, and the left-hand
end of Figure, 2, counterweighted levers, L, are employed to raise the slide, S.
As shown in Figure, 3, and the right-hand end of Figure, 2, a helical spring, M, is
provided. The device shown in Figure, 4, consists of a small cylinder and

page_text: piston, N, in which water under pressure acts. In Figure, 5, the arrangement
partly shown is like that of Figure, 3, and that shown in Figure, 6, is like that of
Figure, 1.
It is to be understood that any parts of the mechanism not hereinbefore
specially referred to is to be constructed and arranged as in existing machinery
for the same purpose.
And it is also to be understood that the mechanism may
be arranged so that the punching action may take place in a vertical, horizontal,
or other direction.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
In punching machines operating by means of a crank or eccentric making the
frame or slide holding the punch movable independently of the crank or eccentric
on the return stroke, and to an extent determined by adjustable stops, the parts
being constructed and combined substantially as and for the purposes hereinbefore
described.
Dated this Twenty-fifth day of March 1891
EDMUND HUNT,
Applicants' Agent.