Improvements in Rotary Cutters.
Year: 1895

page_text: Date of Application, 10th Dec., 1895-Accept.d, 11th Jan., 1896
COMPLETE SPECIFICATION.
Improvements in Rotary Cutters.
We, CHRISTOPHER GEORGE BARTLETT JOHNSON, of Chelsea in the County
of Suffolk and CHARLES EDGAR KENISTON, of Somerville in the County of
Middlesex, both in the State of Massachusetts, United States of America,.
Machinists, 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 especially designed for
the purpose of trimming edges of boot and shoe soles, leather work etc., although
it may be equally useful for the shaping or cutting of other materials as may be
desired.
The invention is carried out as follows, reference being had to the accompanying
drawings, where ;-
-
Fig. 1 represents an end elevation of the improved rotary cutter ;
Fig. 2 represents a similar view showing the fastening nut as removed;
Fig. 3 represents a cross-section on the broken line 3-3 shown in Fig. 1 ;
Fig. 4 represents a cross-section on the line 4-4 shown in Fig. 3;
Fig. 5 represents a rear view of the improved cutter and ;
Fig. 6 represents a detail side elevation of one of the adjustable cutter blocks.
Similar letters refer to similar parts wherever they occur on the different parts.
of the drawings.
In the drawings A represents the cylindrical cutter holder adapted to be secured
to a rotary shaft in any suitable or well-known manner.
Said cutter holder has on its periphery an annular groove A¹, an annular
lip A", and an annular tapering upper guide A³ as shown in the drawings.
The bolder A has made in one piece with its forward end an annular sleeve A',.
on which is loosely journalled a ring B, provided with radial slots b, b, as shown in
Fig. 2.
The outer end of the annular sleeve A' is screw threaded and on it is screwed
the adjustable clamping nut C, as shown in Figs. 1 and 3.
Through the holder A are made cylindrical recesses a, a, adapted to receive
the oscillating cutter blocks D, D, provided with concentric trunnions D¹, in
their rear ends journalled in corresponding recesses a', a' in the annular upper
guide A as shown.
The front ends of the cutter blocks D are each provided with an eccentric
trunnion D, adapted to be received in the radial notches b, of the adjustable.
ring B as shown.
Each of the cutter blocks D is provided with a longitudinal groove d, one
edge d' of which constitutes the cutting edge during the rotation of the tool in
the direction of the arrows shown in the drawings.
The configuration of the cutting edge d¹ may be made of any suitable shape
according to the form of the edge to be cut on the edge of the leather or other
inaterial.
If it is desired to adjust the position of the cutter blocks D in their bearing
recesses in the holder A, all that is necessary to do is to loosen the nut C and
to turn the slotted ring B around its axis causing said slots to turn the eccentric
trunnions Du to the right or left as may be desired by means of which the cutter
blocks D are caused to be oscillated.

page_text: After the cutter blocks have been thus adjusted, they are secured in place by
tightening the nut C, which holds them firmly in position.
By this simple arrangement the rake of the cutting edge of the cutter blocks may
be adjusted to suit the nature of the work and the wishes of the operator.
More or less clearance of the cutters may also be obtained by such adjustment
and as the cutting edges are ground off they may be set up to the required height
from time to time.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is ;-
The hereindescribed rotary cutter, consisting of an annular grooved holder
having longitudinal recesses combined with longitudinal grooved cutter blocks
journalled in said recesses, each such cutter block having an eccentric trunnion
received in a notched adjustable ring and means for securing said ring and
cutter blocks in their adjusted positions to the holder, substantially as and for
the purpose set forth.
Dated this 10th day of December 1895.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to the Applicants.