Improvements in Machines for Punching or Stamping and Outting Sheet Metal.
Year: 1894

page_text: Date of Application, 12th June, 1894-Accepted, 28th July, 1894
Improvements in Machines for Punching or Stamping and Outting
Sheet Metal.
"1
A communication from EMIL SALTZKORN, Consul, and LUDWIG NICOLAI,
Manufacturer, both of Lobtauer Strasse 20, Dresden, in the Empire of
Germany.
1, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Chartered Patent Agent, 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 :-
This invention relates to the class of machine for punching metal strips described
in Specification No. 7608 dated April 17th 1894.
The invention relates to the device for feeding forward the metallic-strip which
is gripped by pins, claws, clutches, or other means, attached to a guide located in
the fixed arm of the machine said device being adapted to be pushed backwards,
when the said machine-arm is in its elevated position, and forwards when such arm
is in its depressed position, by means of a cam-slot or slide-way provided on the
movable hammer-arm.
In the accompanying drawings:-
:-
Figure 1 is a side elevation of the machine made according to this invention,
some parts being shown in section:
Figures 2 and 3 are cross-sections of the fixed arm of the machine in which the
guide is free to slide to and fro.
On a block 1 is secured an arın 3 carrying an anvil 2, and over it is placed the
arm 4, provided with the guide 5 for the knife or cutter stamp-head 9 and
the punching stamp or die 10. In the hollow arm 4 is lodged, so as to slide up and
down, the guide 25, carrying the two-armed rocking lever 21, 22, to which is
connected a rod carrying pins 6. The pins 34 projecting laterally from the guide 25
engage in longitudinal slots 33 formed in the vertical sides of the slide-piece or
guide 28, which are inserted in dovetailed recesses in the side-walls of the hollow
arm 4 and are joined together by a bridging-piece 29.
The pin 30 attached to each side of the guide or slide-piece 28 engages in the
slot of the cam 31 on one side, the said cam being carried on the movable hammer-
arm 8 in such manner as to be adjustable by means of its curved slot 32 and
fixing screws. The lever-arm 21 has its upper surface inclined and extends
underneath the bridging-piece 29, connecting the vertical sides of the slide-piece
or guide 28, the said bridging-piece carrying on its under side a roller 35 which
rotates on the inclined surface of the said lever-arm 21.
The working of the machine is as follows:-
When at rest, the machine is arranged in position as shown in Figure 1.
If now the hammer-arm 8 is depressed by means of the treadle and draw-bar 11,
the slide-way or cam 31 engaging with the pin 30 at first displaces the guide or
slide-piece 28 moving the roller 35 carried by the bridging-piece 29 along the
inclined surface of the lever-arm 21 so as to depress the latter whereby the other
end 22 of the lever-arm is raised, and thus the pins 6 suspended thereto are so far
lifted that they are thrown out of engagement with the metal-strip.
This action is completed during the period of time which is required to displace
the slide-piece or guide 28 and its slot 33 so far that the pin 34 of the guide 25 is
at the forward end of the said slot 33, the other end of the slot having been moved
away from it. At this moment, the pins 6 being raised, the guide or slide-piece 28

page_text: carries the guide with it in its further displacement. As the hammer-arm
continues to descend the movable part 14 of the hammer head which is connected
to the fixed part 13 of the head by the spring 12 strikes on the knife or cutter
stamp-head 9 driving it downwards and thereby severing the metal-strip. By the
contact of the roller 15 with the nose 24 of the guide 5 however the movable
part 14 of the hammer-head is at once diverted, and that just before the fixed
part 13 of the said hammer-head strikes upon the head of the punching die 10
driving it down and thereby completing the punching or stamping of the severed
metal-strip laid on the anvil 2.
Upon the subsequent lifting of the hammer-arm 8, the slide-piece or guide 28
and the bridging-piece 29 travel back in the reverse direction alone for a short
distance, in order that the roller 35 carried by the bridging-piece 29 may return
from the highest to the lowest point of the inclined surface of the lever-arm 21 and
thereby release the spring-controlled lever 21, 22 so that the pins 6 may descend
and engage with the metal-strip, after which the return movement of the guide 25
commences, and therewith simultaneously the forward feed of the metal-strip takes
place.
Instead of the gripping device, essential to the forward feed of the metal-strip,
and in the foregoing case consisting of the said pins 6, as above described, any other
convenient and suitable device may be adopted for taking a firm hold of the said
strip for the purpose of its displacement, such, for instance, as claws or clutches
operating either from underneath or from one side, only it is necessary that their
action must take place in like manner and so as to coincide exactly with the working
of the machine in point of time and place, as hereinbefore described.
Having now particularly described and ascertained the nature of this said
invention as communicated to me by my foreign correspondents, and in what
manner the same is to be performed, I declare that what I claim is :-
1. A machine for cutting and punching or stamping metal strips characterized
by an automatically operating device for gripping or holding and releasing the said
strip in combination with an arrangement of apparatus for the reciprocating
horizontal motion to operate the said strip-feed simultaneously with the reciprocating
vertical motion operating the cutting and punching or stamping mechanism by
means of levers curves and cams or slide-ways.
2. The combination and arrangement of parts constituting the complete machine
for punching or stamping and cutting sheet metal substantially as described and
illustrated in the accompanying drawings.
Dated this 19th do- of Tum 1001
W. P. THOMPSON & BOULT,
Agents for the Applicant.