Improvements in or relating to Punching Machines.
Year: 1894

page_text: Date of Application, 16th Mar., 1894-Accepted, 28th Apr., 1894
COMPLETE SPECIFICATION.
Improvements in or relating to Punching Machines.
A communication from EMIL SALTZKORN, Consul. and LUDWIG NICOLAI,
Manufacturer, both of 20, Lobtauer Strasse, Dresden, Saxony, German
Empire.
I, 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 apparatus for use in connection with punching machines,
whereby it is rendered possible to automatically move the material on which the
work is to be done, forward to into position for successive operations and at the
same time in consequence of engagement with a regulating pin or with more than
one such pin, not only to ensure exactly equal intervals or spaces being attained
between the holes or notches to be punched, but also during the backward or
return movement of the feed-rollers, to apply the necessary tension or pressure to
the material to be operated upon, during the progress of the work.
To this end one or more regulating or spacing pins are provided on the stamper-
head in addition to the usual punch, and at distances apart corresponding to the
intervals to be given between the holes or notches to be punched, and a lever is
mounted on the body or frame of the punching machine in such manner that a to
and fro swinging movement is imparted thereto by an eccentric cam or equivalent
secured to the driving shaft acting on its upper arm.
In the lower arm of the said lever are arranged in a suitable opening or recess
the adjustable transport or feed rollers provided with spring-controlled bearings
and between which the material to be operated on is tightly held.
At the commencement of the operation the material between the rollers is fed
forward under the punch until a hole or notch previously punched therein comes
under the first regulating pin which enters said hole or notch and similarly if there
are more than one regulating pin and hole or notch for its reception.
The movement of the driving shaft being continued, the feed-rollers, by the
further revolution of the cam and by the pressure of a spring are moved back to
their former position whereby the material being held fast by the regulating pin or
pins remains under tension, and the punch making at the same time its downward
stroke, perforates the material accurately at the predetermined interval.
In the accompanying drawings
Figure 1 is a side elevation, partly in section, and
Figure 2 an end elevation of a punching machine fitted with the improved.
feeding device.
In the frame 1 is mounted as usual at the upper part the driving shaft 2 which
operates all the separate parts, and on which are keyed or otherwise secured the
eccentric or crank pin 3 which causes the vertical reciprocation of the punch-
head 13, and the cam-disc or eccentric 4 which actuates the feed-device. On one
side of the frame is mounted the lever 6 oscillating on the pivot 5, its bent upper
part carrying a roller 7 being actuated by the cam-disc or eccentric 4 while its
lower arm is formed with a slideway 8 wherein the feed-rollers 9 and 10 are
mounted in suitable bearings in such manner that by means of the springs 12 coiled
round the adjusting screws 11 the material to be operated upon is firmly held while
however on the backward movement of the feed rollers the latter roll back over
the surface of the material which is meanwhile kept from receding by the

page_text: regulating pin or pins 15 which besides the punch 14 is carried in the punch-
head 13. The regulating pin 15 is provided with a taper point and is somewhat
longer than the punch itself for the purpose of holding fast the material when fed
forward by the rollers. The, distance. of the regulating pin from the punch (or
stamp) is determined by the spacing of the row of holes to be punched. Instead
of a single regulating pin as shown in the drawing, several such pins may be
employed and the engagement of the same may take place successively as the holes
or notches are punched.
The machine as shown in the drawings is supposed to be in a state of rest and
its mode of operation is as follows:
When the driving-shaft rotates the stamping or punching head descends
gradually; while at the same time the cam or eccentric 4 causes an outward swing
of the upper arm of the lever 6 whereby the material held firmly between the feed
rollers is pushed forward by the lower arm of the lever and now the taper point of
the regulating or spacing pin 15 enters the hole which has previously been punched
in the material; thereupon as the cam 4 has ceased to press outwards the roller 7
of the lever 6, the spring 16 fixed to the frame of the machine brings about the
return swing of the lever as well as the retirement of the feed-rollers 9 and 10
whereby tension brought about of the material which is itself prevented by the
regulating pin 15 from being withdrawn by the said rollers. The continued
rotation of the driving shaft then forces the punch through the material at the
predetermined spot which is followed by the reverse action of all the parts.
Having now particularly described and ascertained the nature of the said inven-
tion 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. In a punching machine the combination of a device for feeding the material
to be operated upon with the head of the punch in such manner that previous to the
punching (or stamping) operation and simultaneously therewith the feed regulating
or guide pins hold the material fast and the said material is strained or tightened
by the backward motion of the feed apparatus.
2. The combination with a punching machine of one or more regulating pins such
as 15 and an automatic feeding device comprising a spring-and-cam-operated lever
such as 6-8 carrying spring-controlled rollers 9 and 10 substantially as described
and illustrated in the accompanying drawings.
3. In a punching machine holding or straining the material to be punched during
the punching operation substantially as described and illustrated in the accom-
panying drawings.
Dated this 16th day of March 1894,
W. P. THOMPSON & BOULT,
Agents for the Applicant.