Year: 1899

page_text: I, WILLIAM HENRY DORMAN, of the Green Hall, Stafford, Engineer, do hereby
declare the nature of this invention to be as follows:-
The object of this invention is to provide an improved skiving machine intended
more especially for cutting pasteboard and other composite materials which are
used as substitutes for leather in the manufacture of boots and shoes; such
things as heel stiffeners, for example, being often made of material other than
leather.
In my improved machine I give to the skiving knife a vibratory movement
so that its edge makes a draw cut to and fro as the material is fed forward
against it.
The knife may be provided with a pivot on which it is oscillated by a ball
jointed rod connected to a lever and operated by a disc having an undulating
or waved edge which engages a roll upon the lever, the roll being kept in
engagement by a spring.
If desired the knife may be mounted in a slide and the slide be moved to and
fro so as to give a draw cut to the knife.
The disc may be replaced by a cam and the spring dispensed with.
Adjustments are provided for the knife and the feed rolls, which latter are
revolved in the usual manner.
A geared eccentric, or other mechanical equivalent, may be employed to give
the necessary movement to the knife instead of the arrangements before
mentioned.
Datod h 50th da
T1000
I, WILLIAM HENRY DORMAN, of the Green Hall, Stafford, 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 relates to improvements in skiving machines of the kind
intended more especially for cutting pasteboard and other composite materials
which are used as substitutes for leather in the manufacture of boots and shoes;
such things as heel stiffeners, for example, being often made of material other
*Price S11

page_text: than leather. Such machines as hitherto constructed have stationary knives
which cut with a direct cut and with these machines, therefore, the above named
materials, cannot be operated upon with success.
:
According to my invention I obviate the defect above referred to by giving to
the skiving knife a vibratory movement. so. that its edge makes a draw cut
to-and-fro as the material is fed forward against it. This may be effected, for
example, by mounting the knife on a pivot on which it is oscillated by a ball
jointed rod connected to a lever and operated by a disc having an undulating
or waved edge which engages a roll upon the lever, the roll being kept in
engagement with the disc by a spring. A cam could be employed instead of
the disc and spring. Or the knife may be mounted in a slide and the slide be
moved to-and-fro so as to give a draw cut to the knife.
A geared eccentric, or other suitable mechanical equivalent, may be employed
to give the necessary movement to the knife instead of the arrangements before
mentioned.
Adjustments are provided for the knife and the feed rolls, the latter being
revolved in the usual manner.
To enable the invention to be fully understood I will describe it by reference
to the accompanying drawing, in which:-
Figure 1 is a front view of a machine having my improvements applied
thereto :
Figure 2 is a left hand side view:
Figure 3 is a plan;
Figures 4 and 5 are a side view and sectional plan respectively of alternate
means for imparting the vibrating movement to the knife; and
Figures 6 and 7 are a front view and a side view respectively of a detail
hereinafter described.
A is the main frame of the machine, B is the driving pulley and C the idle
pulley mounted on the shaft 1) which runs in the bearing E and carries the
pinion which gears with the bevel wheel G. The wheel G is mounted on the
shaft H which carries the upper feed wheel I.. The lower feed wheel J is
mounted on the shaft K which is driven from the shaft H by the pair of spur
wheels L and M.
N is the work guide, the said guide being adjustable across the width of the
feeding wheels to suit the width of the shank piece, stiffener or other article
of work being operated upon. The bearings 0, P which carry the shafts H, K
swing on centres Q and the lower bearing P can be adjusted by a screw R to
set the feed wheel J. The upper feed wheel I is pressed towards the lower feed
wheel J by the spring T and is provided with a limiting stop.
U is the skiving knife, the said knife being carried on a holder V which is
free to turn on a stem W in the carrier X mounted upon a pivot Y on the
frame A. An arm % extends from the holder V and is provided with a spring a
which maintains the knife edge bat a suitable angle for cutting the bevel
required upon the work. The pivot Y allows the knife edge b to rise and fall
as required by any up or down movement of the wheel I. The inner corner
of the knife holder rests upon the gauge c (as shewn in Figures 6 and 7)
which is adjustable for setting the angle of the knife and so regulating the
amount of bevel cut on the work.
The description thus far is that of an ordinary skiving machine having no
special features.
"
Now, in order that such a machine may be enabled to operate on materials of
a nature which renders them more difficult to cut than leather, such as paste-
board, leatherboard" and the like, I give to the knife U a vibrating movement
whereby it makes a to-and-fro draw cut through the material. To this end I
advantageously make use of the following arrangement, that is to say, I mount
upon the shaft 1 a disc d which has an undulating or waved edge e. This edge
operates upon a roll of secured to a lever g so as to vibrate the latter to-and-fro

page_text: upon the pivot h, the roll being kept up to the undulating edge by the spring i.
The jointed rod connects the lever to the knife U which is mounted on the
pivot in the holder V. With this arrangement when the disc d is rotated by
the shaft the rod is oscillated thus causing the knife U to vibrate about
the pivot k so as to make a draw cut through the material being operated
upon.
In lieu of the disc d and the spring I can employ a cam shewn in
Figures 4 and 5. Furthermore, the knife can be carried in a slide / and
move bodily from side to side instead of oscillating about a pivot, see also
Figures 4 and 5.
m is an adjustable gauge provided to co-operate with the gauge c to limit
the angular movement given to the knife by the spring a and lever Z.
I wish it to be understood that I do not confine myself to the above described
means for vibrating the knife as the necessary motion can be imparted to the
said knife, by other suitable known means if desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In a machine of the kind described for skiving heel stiffeners, shank pieces
and the like employed in the manufacture of boots and shoes, the combination
with the skiving knife of means whereby it can be vibrated for effecting a draw
cut in the material operated upon, substantially as hereinbefore described.
2. In a skiving machine of the kind described in Claim 1 the combination
with the feeding wheels and work guide of a knife carried in a holder which
can be adjusted to accommodate the knife to the movement of the feed wheels,
substantially as herein before described.
3. In a skiving machine of the kind described in Claim 1 the arrangement
wherein the knife is pivoted to a carrier and is adapted to be vibrated by a
jointed rod actuated by a lever carrying a roll engaging an undulating disc
or cam, substantially as herein before described.
4. In a skiving machine of the kind described in Claim 1 the arrangement
wherein the knife is mounted in a slide, substantially as herein before described
and illustrated in Figures 4 and 5.
5. The combination and arrangement of parts forming the improved skiving
machine herein before described and illustrated in Figures 1, 2 and 3 of the
accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.