Improvements in or relating to Punching Machines for Manufacturing Toothed or Perforated Metal Strips.
Year: 1897

page_text: Date of Application, 18th Nov., 1897--Accepted, 12th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in or relating to Punching Machines for Manufacturing
Toothed or Perforated Metal Strips.
A communication from EMIL SALTZKORN, Consul, and LUDWIG NICOLAI, Manu-
facturer, both of Lobtauer Strasse 20, Dresden, in the Kingdom of Saxony,
Empire of Germany.
I, ALFRED JULIUS BOULT, of 111, Hatton Garden, 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 ascer-
tained in and by the following statement:-
-
This invention relates to a device for punching machines for manufacturing
toothed or perforated metal strips of unlimited length, as used for forming the edges
of cardboard boxes and the like and has for its special object to ensure the teeth
or holes in the metal strips being formed at exactly equal intervals in spite of the
expansion or bending of the metal strip during the work, by holding the strip in
front of and behind the punch in position and properly stretched during the feeding
movement and during the punching by means of alternately engaging pins or the
like.
As may be seen from the accompanying drawing, the blank metal strip from say
a reel, is fed through a rectilinear guide A to the punch a, which is provided with
two or more pins 6 moving in advance of the punching tools. The pins engage
with the teeth intervals or holes produced in the strip in the preceding operation.
The finished part of the strip passes through a guide on which is caused to recipro-
cate a carriage operated by a levere and provided with a pawl or bar which has
on its lower surface points or pins e. At the end of this guide there is arranged
a piston or plunger working in a cylinder by means of a lever f and provided at
the bottom with pins g. The pins e and g alternately engage with the strip.
During the time that the strip is fed forward it is gripped or engaged only by
the pawl with its pins e the pins 6 and g being held in their raised position out
of engagement with the strip. The blank smooth part of the strip is pulled through
the punch and the guide A, considerable force being used, whereby the strip is
held in a state of tension so as to prevent it from bending or twisting. As the
feeding operation ceases the pins b in advance of the punch begin to engage in order
to maintain the strip in its position and tension for the punching operation. Nearly
simultaneously the pins 9 on the plunger also engage with the strip so that the
portion of the strip is held fast. between them and the pins b while the carriage
returns and releases the points of the pawl d from the strip said points sliding on
the latter. During the punching operation and simultaneously with the return
of the carriage is also effected the winding up of the finished portion situated
beyond the guide and in front of the pins 9 which prevent the undesirable bending
of the strip during this winding up operation.
g
Having now particularly described and ascertained the nature of the 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 punching machine for perforating or providing with teeth metal strips
characterised by the strip being held fast in its position during the punching and

page_text: winding up operation by means of pins as 6 or the like, arranged between punches a
and a feeding pawl as de, and pins as g or the like between the feeding pawl and
the winding reel for the purpose of separating different working operations in the
machine (punching, feeding, winding up) from one another in such manner that
the different operations cannot influence the exact formation of the strip substan-
tially as described.
2. The combination and arrangement of parts constituting the complete means
for holding and feeding forward, during the punching operation, metal strips for
cardboard box edges and the like substantially as described and illustrated in the
accompanying drawings.
Dated this 16th day of November 1807
BOULT & WADE,
Agents for the Applicant.