Improvements in Rotary Cutters.
Year: 1897

page_text: I, CHARLES M. JOHNSON, of Broad Street House, in the City of London, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in rotary cutters having adjustable
knives and particularly adapted for use for trimming the heels and soles of boots
and shoes but also applicable for other purposes where rotary cutters are required,
the improvements having for object to provide simple and efficient means to allow
of the several knives being adjusted separately and locked in the position to which
they have been adjusted.
For this purpose each knife is provided with teeth with which engages a toothed
wheel on a pin one end of which extends through the body of the cutter and is
squared or otherwise adapted to be turned by a key or the like for adjusting the
knife in one direction or the other according to the direction in which the pin is
turned.
In order to lock the knives in the position to which they have been adjusted
I provide for each knife a set screw or the like which passes through an eccentric
slot in the outside plate usually employed for adjusting the knives simultaneously.
Dated this 5th day of May 1897.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Rotary Cutters.
I, CHARLES M. JOHNSON, of 22 and 23. Laurence Pountney Lane, late of Broad
Street House, in the City of London, 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 rotary cutters of the kind wherein the
knives are held in slots or recesses in the cutter body and which are particularly
adapted for use for trimming the heels and soles of boots and shoes but also
applicable for other purposes where rotary cutters are required, the improvements
having for object to provide simple and efficient means to allow of the several
knives being adjusted separately and locked in the position to which they have been
adjusted.
For this purpose each knife is provided with teeth with which engages a toothed
wheel on a pin one end of which extends through the body of the cutter and is

page_text: .
squared or otherwise adapted to be turned by a key or the like for adjusting the
knife in one direction or the other according to the direction in which the pin is
turned.
In order to lock the knives in the position to which they have been adjusted
I provide for each knife a set-screw or the like which passes through a radial
slot in the outside plate usually employed for adjusting the knives simultaneously.
To enable the invention to be fully understood I will describe it by reference, to
the accompanying drawing, in which :-
Figure 1 is a sectional elevation of a rotary cutter having my improvements
applied thereto :
Figure 2 is a section on the line 2-2 Figure 1:
Figure 3 is a section on the line 33 Figure 1:
Figure 4 is a section on the line 44 Figure 1; and,
Figures 5, 6, 7 and 8 are views of details.
C
a is the body of the cutter, the said body being of known construction and
provided with the usual slots a' for the knives band with the clearance spaces a
for the escape of the material removed by the knives. c is the outside plate which
fits upon one side of the cutter so as to hold the knives in their slots a' in the
body, the said outside plate being held in position upon the cutter body a by
means of a central plug d which screws into the body a as clearly indicated in
Figure 2.
ee are the pins which are provided in connection with each knife & one end
of each of the said pins projecting through the body of the cutter and being squared
as shewn at c', and is the toothed wheel with which the other end is provided,
the said toothed wheels engaging with teeth y upon each knife & as clearly shewn in
Figure 1. With this construction it will be obvious that each knife can be adjusted
in position in its slot in the body of the cutter by turning the pin e by any
suitable means, such as by a key.
C
h, h are the set-screws, one of which is provided in connection with each knife b,
the said screws passing through the usual slots in the outside plate e and screwing
into slides shewn in elevation and plan in Figures 7 and 8 and which are of a
T-shape in cross section and fit into similarly shaped slots j in the knives b, b
shewn clearly in Figures 5 and 6. The slots j, j in the knives are cut obliquely
to the axis of the said knives and the slides are made to fit them. When each
knife has been adjusted in position, the screw is turned so as to draw up the knife b
against the inside of the outside plate thereby locking the said knife in position.
To adjust any individual knife, the set screw h belonging to it is loosened and its
pine then turned so as to move it in its slot a', the relative movement of the
knife b and outside plate e being made possible by the movement of the slide in the
knife. To adjust all, the knives simultaneously the central plug is unscrewed
so as to free the outside plate a from the body of the cutter and any one of the
pins e, c is turned, the rotation of the pin causing the outside plate e to turn as
all the knives are rigidly fixed to the said outside plate by the set-screws h. After
adjustment the central plug is screwed up and fixes the outside plate in
position.
kis the usual guide plate for causing the cutter to follow the work it is trimming,
the said guide plate being held in position by the plug which holds the outside
plate c to the cutter.
It will be obvious that with my improved construction of cutter the knives are
held more firmly and securely and that there is less liability to become loose than is
the case with ordinary cutters where the knives are held by cams, eccentric pins or
the like.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
.
1. In rotary cutters of the kind described, adjusting the knives in their slots

page_text: by means of pins having pinions which engage with teeth formed on the said
knives, substantially as hereinbefore described.
2. In rotary cutters of the kind described, fixing each knife to the outside plate
of the cutter by means of a set-screw which passes through a slot in the said plate
5 and screws into a slide working in the said cutter, substantially as hereinbefore
described.
by means of pins having pinions which engage with teeth formed on the said
knives, substantially as hereinbefore described.
2. In rotary cutters of the kind described, fixing each knife to the outside plate
of the cutter by means of a set-screw which passes through a slot in the said plate
and screws into a slide working in the said cutter, substantially as hereinbefore
described.
3. The improved rotary cutter herein before described and illustrated in the
accompanying drawing.
Dated the 20th dox of Tony 100Q