Improvements in Punching or Punching and Shearing Machines.
Year: 1899

page_text: Date of Application, 1st Feb., 1899
Complete Specification Left, 31st Oct., 1899-Accepted, 16th Dec., 1899
PROVISIONAL SPECIFICATION.
Improvements in Punching or Punching and Shearing Machines.
I, CLAUDE CARTER, of Thorne House, Johnstone, Renfrewshire, Engineer, do
hereby declare the nature of this invention to be as follows:
1
This invention which relates to eccentric punching or punching and shearing
machines has for its object the provision of improved driving gear whereby the
motion of the punches is so controlled that the period during which the punches
are raised or remain out of action is greater than that occupied in effecting
the punching operation, so that ample time is allowed for placing the plates
to be punched in position whilst the speed of the machine is increased.
To that end I secure upon the shaft which drives the eccentrics operating
the punches or shears a toothed wheel made up of a boss having formed on it
two segments in different planes one of which segments is a true half circle or
other part of a circle concentric with the boss and gears with a toothed pinion
keyed concentrically on the first motion shaft or a counter shaft driven there-
from, whilst the other segment is elliptical or eccentric to its boss and gears
with a second pinion keyed eccentrically on the first motion shaft or counter-
shaft. At the points or lines where the concentric and elliptical segments
merge into each other one or more teeth of one segment extends across the
width of both so as to ensure a steady motion, and at such points the movement
of the punch or shearing cutter which is slow in entering the plate to be punched or
cut is by this formation of the gearing rapidly accelerated so that the punch
is rapidly withdrawn and the motion is slower, whilst the punch is raised to
permit of the plate being moved to present it to the down-coming punch or
shearing cutter.
When the punching machine is double ended two sets of segments and pinions
constructed and geared as described may be employed to provide the desired
variable motion of the punches or shearing knives when the punching takes
place alternately at either end of the machine.
In lieu of the segments and pinions above described toothed wheels or pinions
may be keyed eccentrically on both shafts or made of heart shape and geared
with each other to obtain a variable motion of the punches approximating to
that desired.

page_text: Improvements in Punching or Punching and Shearing Machines.
I, CLAUDE CARTER, of Thorne House, Johnstone, Renfrewshire, Engineer, 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 which relates to eccentric punching or punching and shearing
machines has for its object the provision of improved driving gear whereby the
motion of the punches is so controlled that the period during which the punches
are raised or remain out of action is greater than that occupied in effecting
the punching operation, so that ample time is allowed for placing the plates
to be punched in position whilst the speed of the machine is increased.
The invention is illustrated by the accompanying drawings, Figure 1 being
a longitudinal elevation partly in setcion, and Figure 2 an end elevation of the
improved punching or punching and shearing machine. Figure 3 is a detail
of the gearing.
I secure upon the shaft A which drives the eccentrics operating the punches B
or shears C a toothed wheel made up of a boss D having formed on it two seg-
ments D1, D2, in different planes, one D¹ of which segments is a true half circle
or other part of a circle concentric with the boss D and gears with a toothed
pinion E keyed concentrically on the first motion shaft F, or as shown on a
counter shaft G driven therefrom by toothed wheels H, I, whilst the other
segment D2 is elliptical or eccentric to its boss D and gears with a second pinion J
keyed eccentrically on the first motion shaft or counter shaft G. At the points
or lines where the concentric and elliptical segments E, J, merge into each
other one or more teeth of one segment extends across the width of both so as
to ensure a steady motion, and at such points the movement of the punch or
shearing cutter which is slow in entering the plate to be punched or cut is
by this formation of the gearing rapidly accelerated so that the punch B is
rapidly withdrawn and the motion is slower, whilst the punch is raised to permit
of the plate being moved to present it to the down-coming punch B or shearing
cutter C.
When the punching machine is double ended two sets of segments and
pinions constructed and geared as described may be employed to provide the
desired variable action of the punches or shearing knives when the punching
takes place alternately at either end of the machine.
In lieu of the segments and pinions above described toothed wheels or pinions
may be keyed eccentrically on both shafts A and G, as shown at Fig. 3, or made
of heart shape and geared with each other to obtain a variable motion of the
punches approximating to that desired.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what
I claim is:
In a punching or punching and shearing machine, driving gear consisting of
a toothed wheel made up of a boss having formed on it two segments in different
planes, one segment being concentric with, and the other eccentric to, the boss
of the wheel, and two toothed pinions keyed one concentrically and the other
eccentrically on the first motion shaft or a counter shaft geared thereto, these
pinions being geared respectively with the concentric and eccentric segments
of the toothed wheel, substantially as described.

page_text: 2. In a punching or punching and shearing machine the modification of
driving gear described with reference to Figure 3.
Dated this 30th day of October 1899.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather,
Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.