Improvements in Rotary Cutters for Trimming the Heels and Soles of Boots and Shoes.
Year: 1897

page_text: Date of Application, 21st Apr., 1897
Complete Specification Left, 19th Jan., 1898-Accepted, 19th Feb., 1898
PROVISIONAL SPECIFICATION.
Improvements in Rotary Cutters for Trimming the Heels and Soles
of Boots and Shoes.
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 for use in trimming the
heels and soles of boots and shoes, the object being to provide means whereby the
several knives can be adjusted either separately or together as may be required.
For this purpose the inner end of each knife is provided with two slots into each of
which slots passes the conical end of a screw working in the outside plate of the
cutter which outside plate is adapted to be rotated and is held in any desired position
by screws which pass through concentric slots in the body of the cutter.
By this arrangement it will be obvious that any one of the knives can be adjusted
separately by means of the screws working in the slots thereof and also that the
whole of the knives can be simultaneously adjusted by rotating the outside plate to
which the said knives are held. Or the simultaneous adjustment of the knives
can be effected by means of a cam on the end of a pin passing through the body of
the cutter.
In some cases the adjustment of the cutters may be effected by providing them
each with screw thread teeth into which gears a worm which can be operated by a key
or the like or all the knives may be operated simultaneously by a worm wheel gearing
with teeth in a slot in the outside plate.
Dated the 21st day of April 1907
Improvements in Rotary Cutters for Trimming the Heels and Soles
of Boots and Shoes.
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 for use in trimming the
heels and soles of boots and shoes, of the kind wherein the knives are held in slots
or recesses in the cutter body, the object being to provide improved means whereby
Di Q77

page_text: the several knives can be adjusted either separately or together as may be
required.
For this purpose the inner end of each knife is provided with one or two slots
into which pass the conical ends of screws working in the outside plate of the cutter,
which outside plate is adapted to be rotated and is held in any desired position by
one or more screws or bolts which pass through one or more slots in the body of the
cutter.
By this arrangement it will be obvious that any one of the knives can be adjusted
separately by means of the screws working in the slot or slots thereof and also that
the whole of the knives can be simultaneously adjusted by rotating the outside plate
to which the said knives are held. Or the simultaneous adjustment of the knives
can be effected by means of a cam or eccentric projection on the end of a pin
passing through the body of the cutter.
To enable my invention to be fully understood I will describe it by reference to
the accompanying drawing, in which :-
Figure 1 is a side elevation of a rotary cutter for trimming the heels and soles of
boots and shoes, 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 3-3 Figure 1:
Figure 4 is a view similar to Figure 1 of a cutter having modified means for
simultaneously adjusting the knives:
Figure 5 is a section on the line 5-5 Figure 4:
Figure 6 is a side elevation of a portion of a cutter shewing further means for
simultaneously adjusting the knives:
Figure 7 is a section on the line 7-7 Figure 6.
a is the body of the cutter, the said body being of known construction and pro-
vided with the usual slots a¹ for the knives b and with the clearance spaces a² 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 a¹ in the body a,
said outside plate c 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.
the
e is the slot or recess with which each knife is provided upon its outer face, the
sides of the said slot being made to taper inwards, and f, f are the two screws which
work in the outside plate c of the cutter and which are formed with conical ends
designed to bear against the tapered sides of the slot, as shewn in Figure 3. With
this construction it will be obvious that, by adjusting the respective depths to which
the coned ends of its two screws f, f extend into the slot e, each knife bis moved in its
slot a¹ so as to be adjusted to the proper position, that is to say, the knives can, by
this device, be individually adjusted and secured in position with respect to the out-
side plate c. A separate taper recess e can, if desired, be provided for each
screw f, the adjusting operation in this case being precisely similar to that above
described.
In the arrangement shewn in Figures 1, 2 and 3, the knives 6 are simultaneously
adjusted by rotating the outside plate c by hand, the said plate c being, when the
desired position is attained, rigidly secured to the body a of the cutter by means of
the bolty which passes through the said outside plate and the body a and is pro-
vided on its projecting end with a nut g¹. The body a is furnished with a slot h so
that the bolt g, when its nut g¹ is loosened, can move with the outside plate c.
In Figures and 5 and 6 and 7 I have illustrated cutters provided with other
means for effecting the simultaneous adjustment of the knives b, the individual
adjustment of which, however, is effected in the same manner as in the above
described construction.
In the cutter shewn in Figures 4 and 5 this simultaneous adjustment is effected
by means of a pin i which passes through the body a of the cutter and is provided
on its outer end with an eccentric projection which enters a slot j in the outside
plate c, so that by rotating the pin i, through the medium of a key fitted to its

page_text: square projecting end 22, the outside plate c is rotated so as to simultaneously adjust
the whole of the knives.
In the construction shewn Figures 6 and 7, the pin is provided, in lieu of the
eccentric pin i, with a pinion k which gears with a rack formed on the inside of a
slot j¹ in the outside plate c so that by turning the said pin i, the outside. plate is
rotated and thereby simultaneously adjusts the whole of the knives.
m is 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 d which holds
the outside plate c to the cutter.
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 rotary cutters of the kind described providing each cutter with one or two
slots in which engage the conical ends of two screws working in the outside plate of
the cutter for individually adjusting each knife, substantially as hereinbefore
described.
2. In rotary cutters of the kind described, securing the knives rigidly in position
by one or more bolts or screws passing through the outside plate and a slot or
slots in the body of the cutter, substantially as herein before described.
3. In rotary cutters of the kind described, the employment, for simultaneously
adjusting all the knives of the cutter, of a pin passing through the body of the
cutter and having a cam or eccentric projection which engages in a slot in the
outside plate, substantially as herein before described.
4. In rotary cutters of the kind described, the employment, for simultaneously
adjusting all the knives, of a pin passing through the cutter and having a pinion
which engages with a toothed slot in the outside plate, substantially as herein-
before described.
5. The improved rotary cutters hereinbefore described and illustrated respec-
tively in Figures 1, 2 and 3; 4 and 5; and 6 and 7 of the accompanying
drawing.
Dated this 18th day of January 1900
G. F. REDFERN & Co.
4, South Street, Finsbury, London, Agents for the Applicant.