Improvements in or relating to Heel Trimming Machines.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Heel Trimming Machines.
We, ALFRED POCHIN, trading as The Standard Engineering Co., 43, Welford
Road, Leicester, Makers of Boot and Shoe Machinery, FRANK HOWARD POCHIN,
Draughtsman, and HENRY ADDISON, Manager, both of the same address, do hereby
declare the nature of this invention to be as follows:-
This invention has reference to heel trimming or paring machines in which
rotary cutters are employed, and consists of an improved construction of cutter
carrying block or cutter holder, by which the knives or cutters are clamped or
held in position on the cutter shaft.
The present invention is designed chiefly as an improvement upon the invention
set forth in the Specification of our prior Patent No. 11884 of 1893.
The cutter carrying block therein described is according to the present invention
constructed in two halves.
The dovetail projections on the underside of the curved blades are gripped
between these two halves, the sides of the grooves in which are inclined to
correspond with the sides of the projections on the blades.
The two halves of the cutter carrying block are forcibly pressed towards each
other to grip the blades or cutters between them, by means of a nut headed screw
which is screwed into the end of a rotary shaft.
One or more springs may be interposed between the two parts of the cutter
carrying block to open or separate them when the nut headed screw is released
and it is desired to remove or adjust the cutters.
The adjacent faces of the said two parts of the block may be provided one with
a boss and keyway and the other with a boss or sleeve and key for fitting there-
over.
Or as an alternative, one face of the said block may have a series of guide pins
projecting therefrom adapted to enter openings in the other face, to prevent one
part of the block rotating without, or altering its position relatively to, the other.
Doted this 17th day of November 1897.
BOULT & WADE,
Agents for the Applicants.

page_text: Draughtsman, and HENRY ADDISON, Manager, both of the same address, do hereby
declare the nature of this invention and in what manner the same is to be per
formed to be particularly described and ascertained in and by the following
statement:—
This invention has reference to heel trimming or paring machines in which
rotary cutters are employed, and consists of an improved construction of cutter
carrying block or cutter holder, by which the knives or cutters are clamped or
held in position on the cutter shaft.
The present invention is designed chiefly as an improvement upon the invention
set forth in the Specification of our prior Patent No. 11884 of 1893 and will be
understood from the following description in reference to the accompanying
drawings in which,
Figure 1 is a view partly in elevation and partly in central longitudinal section
of Figure 3 of a rotary cutter mounted on the end of a shaft and constructed in
accordance with this invention.
Figure 2 is a similar view of a different aspect of the rotary cutter, Figure 3 is
a face view and Figure 4 is a face view of the part B of the cutter carrying block
showing certain parts in section.
The rotary cutter shown in the example illustrated in the drawings comprises
three curved blades or cutters A, hereinafter termed cutters, each of which is
provided on its under or concave side with a dovetail projection A¹ which fits in
a groove having correspondingly shaped sides in a cutter carrying block formed
in two parts BC which when forcibly pressed together by the nut headed screw D
as hereinafter described clamp the cutters between them.
The part B of the cutter carrying block has on its outer face a boss B¹ which
fits over the conical end of a rotary shaft E and may be pressed towards the
shoulder E on the latter.
Its inner face is provided with a central boss 132 over which the tubular centre
of the other part C of the block fits.
It is also furnished with two or more projecting guide pins FFI shown only in
Figure 4 which fit into corresponding holes in the adjacent face of the other part C
and prevent one part of the block rotating without or altering its position rela-
tively to the other.
This inner face is also furnished with three cavities Figs. 1 and 4 each having
located therein a spiral spring G projecting beyond and compressible by contact
with the other part C of the block for a purpose hereinafter set forth.
The other part C of the block is provided with a countersunk hole C¹ to receive
the head of a screw C³ the stalk of which passes through it and into the part B
thereby limiting the distance as shown in Figure 2 the two parts of the block
can be pressed apart by the said springs.
The outer face of the part C has fastened thereto by three screws H, a disc H¹
with projections H2 thereon, against which the rear ends of the cutters A abut
as shown in Figure 3.
The part C of the cutter carrying block is forced towards the other part B so
that the cutters are clamped between them by turning the nut headed screw D,
having a left handed thread, passed into the end of the usual rotating shaft E
of a heel trimming machine.
When the cutters A have been placed in the groove in the cutter carrying
block BC with their ends abutting against the projections H2 on the disc H',
the screw D is tightened so as to force the part B along the conical end of the
rotating shaft E towards the shoulder E' until it fits tightly thereon.
The part C is also at the same time forced towards B until the cutters are
tightly gripped between them and the springs G, compressed, the guide pins F
on the part B having entered the holes in the other part, prevent one part rotating 5
without the other.
To remove the cutters for grinding or other purposes the screw D is released

page_text: whereupon the springs G, now in compression, will press the part C away from B
and thereby release the cutters and the head of the screw C³ will prevent the
part C dropping off the boss B².
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
1. A rotary cutter comprising curved blades provided with dovetail projec-
tions, a cutter carrying block formed in two parts and provided with a groove
to receive the said projections and a screw passed through the said cutter block
and into the rotary shaft for the purpose described.
2. In a rotary cutter the combination with the curved blades provided with
dovetail projections of a cutter carrying block recessed to receive the said projec-
tions and formed in two parts adapted to be clamped together to grip the blades
and having a spring or springs interposed between the said two parts to force
them apart when the blades are to be removed.
3. In a rotary cutter the combination with the curved blades of a cutter carrying
block formed in two parts adapted to be clamped together to grip the said blades
between them and provided one with guide pins and the other with holes to
receive the latter for the purpose described.
4. A cutter carrying block for the blades of a rotary cutter, formed in two
sections normally held apart by means of a spring or springs and adapted to be
pressed together to grip the cutting blades and secured to the rotary shaft by
means of a screw substantially as described.
5. The improved rotary cutter consisting of the parts constructed, arranged and
operating substantially as described and illustrated in the accompanying drawings.
Dated this 16th day of August 1898.
ALFRED POCHIN.
FRANK HOWARD POCHIN.
HENRY ADDISON.
Witness:
E. N. LEWIS,
Berridge Street Chambers,
Leicester.
ALFRED POCHIN.
FRANK HOWARD POCHIN.
HENRY ADDISON.
Boult & Wade,
Agents for the Applicants.