Improvements in or relating to Heel Trimming Machines.
Year: 1893

page_text: Date of Application, 16th June, 1893
Complete Specification Left, 16th Sept., 1893-Accepted, 28th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to Heel Trimming Machines.
We WILLIAM ROBERT MUDD and ALFRED POCHIN of Newarke Street,
Leicester, Boot and Shoe Machinists and HENRY ADDISON, Foreman in the
employ of the above do hereby declare the nature of this invention to be as
follows:-
This invention has reference to heel trimming machines used in the manufacture
of boots and shoes and relates to that class of machine in which rotary knives or
cutters are employed.
The invention has for its object an improvement in the means employed for
holding the knife or knives in operative position.
According to this invention each knife may be provided on its inner surface with
a projection, preferably dovetailed, adapted to fit into a similarly constructed
groove on a block or equivalent carried on the driving shaft.
Communicating with each of the grooves referred to may be a passage in the
said block in which may be located a block or other device adapted to be pressed
firmly against the projection on the knife in such a manner as to tighten it within
its groove.
A convenient means of forcing the blocks against the projections on the knives.
may consist of a cone or equivalently shaped bolt or screw passing through the
block on the shaft and bearing against each of the blocks before referred to in
such a manner as to clamp the knives in position in their respective grooves.
We do not confine ourselves precisely to the details set forth as these may be
modified or altered without departing from the main lines of the invention.
Dated this 16th day of June 1892.
W. P. THOMPSON & BOULT,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or relating to Heel Trimming Machines.
We, WILLIAM ROBERT MUDD, and ALFRED POCHIN of Newarke Street,
Leicester, Boot and Shoe Machinists, and HENRY ADDISON, Foreman, in the
employ of the above, 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 has reference to heel trimming machines used in the manufacture
of boots and shoes and relates to that class of machine in which rotary cutters are
employed.
The invention has for its object an improvement in the means employed for
holding the cutters in operative position.
According to this invention each cutter may be provided on its inner surface with
a projection, preferably dovetailed, adapted to fit into a similarly constructed
groove on a block or equivalent carried on the driving shaft.
Communicating with each of the grooves referred to may be a passage in the
said block in which may be located a block, pin or other device adapted to be
pressed firmly against the projection on the cutter in such a manner as to tighten it
within its groove.
A convenient means for forcing the blocks or pins against the projections on the
TD 1

page_text: cutters may consist of a cone, tapered or equivalently shaped bolt or screw passing
through the block on the shaft and bearing against each of the blocks or pins
before referred to in such a manner as to clamp the cutters in position in their
respective grooves.
The invention will be more clearly understood upon reference to the accompanying
drawings, wherein,
Figures 1 and 2 are face view and side elevation, half in section, respectively, of
a rotary cutter constructed in accordance with this invention.
Figure 3 is an elevation of the lock bolt and
Figure 4 a face view of the cutter rest plate.
Figure 5 is a modification of the clamp pin for locking the rotary cutter shown
therewith.
Figures 6 and 7 are vertical and longitudinal sections of a rotary cutter
constructed according to a modification.
Referring to Figures 1 to 5, the rotary cutters A are each provided on their
inner or concave side with a dovetailed projection running in the direction of the
curve thereof, and of which a most convenient form is shown at A' Fig. 2.
The said projections as will be noticed fit into correspondingly shaped grooves
formed in the convexed end of a block B having a boss B' which fits over the
usual rotating shaft from which the cutters receive their motion.
The projection A' on each cutter is locked or tightened within its groove by a
pin, bolt, block or equivalent. C, (hereinafter referred to as a clamp pin) located
within a transverse passage or socket in the cutter carrying block B.
In the modification shown in Fig. 5, the clamp pin C is formed with an
extension C¹ with flattened sides which enters the hollowed portion A³ of the
projection A¹
The block B has also a central passage B' through the same and the boss B¹
thereof at a right angle to the transverse passages before mentioned.
In this ceutral passage there is located a taper or conical headed bolt D, Fig. 3,
having a left hand screw threaded end D¹ for screwing into the end of the usual
rotating shaft.
When the latter is in motion it tends to tighten the said screw in position
thereon.
As the said taper bolt D is screwed into the tool carrying shaft the increasing
diameter of the head of the former presses on the inner ends of the clamp pins
and forces the latter against the projections A¹ and securely locks the latter within
their grooves.
The taper bolt D has a square end D' so as to facilitate its being inserted into
and removed from the cutter carrying shaft by a wrench or spanner.
In order to insure the cutters A being fixed in proper relative positions to each
other, a plate E Fig. 4, is fastened by screws E to the face of the block B.
This plate is provided with two lugs E¹ extending backwardly beyond the plane
of the plate E so as to form a stop against which the rear edge of the cutter abuts
as indicated most clearly in Fig. 2 and while in this position the bolt D is tightened
and the cutters secured against accidental movement.
In order to prevent the clamp pins from falling out or turning in their sockets
they are each provided with a flat surface C' upon which the end of a screw F may
lightly abut in such a manner as to allow them to move to and fro, but which until
withdrawn prevents the said pins from being removed.
In the modification shown in Figs. 6 and 7, the cutters G are each provided with
a dovetailed projection G¹ running across the end thereof in the direction of its
width.
This projection is slid into a correspondingly shaped groove H¹ formed across
the circumference of a circular cutter carrying block H and locked therein by
clamp pins J located in passages in the said block H and pressed tightly home by
a left hand screw threaded bolt D passing through the centre of the said block and
in contact with the pins J.

page_text: The outer ends of the said pins are flattened on each side to pass into a groove
or opening formed in the projection G¹.
To prevent the pins J falling out of their passages, each is provided with a flat
surface Jagainst or in which is the end of a screw F the latter passing through
the cutter carrying block H as indicated in Fig. 6.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
1. A rotary cutter and projection thereon and a cutter carrying block or
equivalent correspondingly grooved for the reception of the said projection for the
purpose described.
2. A rotary cutter and projection thereon, a cutter carrying block corre-
spondingly grooved for the reception of the said projection and means for locking
the said projection in the said groove for the purpose described.
3. In a heel trimming machine the combination of the rotary cutter and
projection thereon, cutter carrying block correspondingly grooved for the reception
of the said projection, clamp pins C, and taper bolt D substantially as and for the
purpose described and illustrated in the accompanying drawings.
4. The complete rotary cutter constructed and arranged substantially in the
nanner described and illustrated in the accompanying drawings.
Dated this 15th day of September 1893.
Witness:-
E. NORTH LEWIS,
ALFRED POCHIN.
HENRY ADDISON.
Berridge Street Chambers, Leicester.
W. P. Thompson & Boult,
Agents for the Applicants.