Improvements in Boot and Shoe Sewing Machines.
Year: 1891

page_text: Date of Application, 23rd Sept., 1891
Complete Specification Left, 26th Sept., 1891-Accepted, 31st Oct., 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by GEORGE WHITEFIELD DAY, of Havehill,
Massachusetts, Gentleman, and THE CAMPBELL MACHINE COMPANY, of
Pawtucket, Rhode Island, both in the United States of America.]
Improvements in Boot and Shoe Sewing Machines.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of this invention to be as follows
The invention relates to the form of sewing machines employing a whirl, and
is especially adapted to the boot and shoe sole sewing machine sometimes known
as te "Blake Machine," and it relates especially to the organization in such a
machine of mechanism for rotating the whirl continuously in one direction and
at varying rates of speed.
The mechanism comprises an eccentric mounted upon an operative shaft and
a. combined eccentric strap and lever connected with a wheel, by means of a roll
and slide, the wheel being upon a shaft which communicates the motion to the
whirl by bevel gear. This eccentric lever, its operating eccentric, .the fulcrum
on the lever and the wheel are so arranged in relation to each other, that, the
speed or extent of movement of the operative end of the lever is constantly varying
with an easy movement and this variation is in turn .communicated to the whirl in
such a manner as to increase its efficiency.
The machine comprises a main shaft upon which is arranged an eccentric
provided with an eccentric strap from which extends a lever having a long
slot. This slot receives a fulcrum block pivoted by means of a pin or pivot
to a bracket. The bracket supports a short shaft to one end of which is
secured a wheel or disc. This wheel or disc has extending across its face
a cross recess or way which receives a roll carried by a pin upon the
end of the eccentric lever. The motion of the eccentric, while it oscillates
the lever upon its fulcrum, also draws or moves the lever relatively to the fulcrum,
so that the end of the lever, carrying the roll is shortened and lengthened and of
course moves at varying speeds according as its position in relation to the fulcrum
point varies.
This irregular movement of the lever is communicated to the wheel or disc by
means of the roll connecting the lever end with it, and this roll is caused to traverse
the recess or way while the wheel is rotating, so that the relation between the
centre of the wheel and the roll is constantly varying, and there is thus communi-
cated to the wheel a variable speed which is easy, regular, well balanced and one
that can be used at a high rate of speed. The motion of this wheel to the whirl
carried at the upper end of the horn is transmitted by means of the bevel gear on a
shaft the bevel gear on the vertical shaft and the intermediate connections common
to this style of machine.
In lieu of the eccentric, I can use any device for oscillating and reciprocating
the lever which will provide it with movements equivalent to that given by the
eccentric.

page_text: COMPLETE SPECIFICATION.
Improvements in Boot and Shoe Sewing Machines.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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:
The invention relates to the form of sewing machines employing a whirl, and is
especially adapted to the boot and shoe sole sewing machine sometimes known as
the "Blake Machine" and it relates especially to the organization in such a
machine of mechanism for rotating the whirl continuously in one direction and at
varying rates of speed.
The mechanism comprises an eccentric mounted upon an operative shaft and a
combined eccentric strap and lever connected with a wheel, by means of a roll and
slide, the wheel being upon a shaft which communicates the motion to the whirl by
bevel gear.
This eccentric lever, its operating eccentric, the fulcrum on the lever
and the wheel are so arranged in relation to each other, that the speed or extent of
movement of the operative end of the lever is constantly varying with an easy
movement and this variation is in turn communicated to the whirl in such a manner
as to increase its efficiency.
In the accompanying drawings,
Figure 1 is an elevation of part of a McKay sewing machine with my invention
applied thereto.
Figure 2 is an enlarged rear elevation, and
Figure 3 is also a rear elevation to an enlarged scale of the parts to which this
invention especially relates the parts being in a different position from that repre-
sented in Figure 2.
The machine comprises a main shaft a upon which is arranged an eccentric A
provided with an eccentric strap a¹ from which extends a lever a² having a
long slot a³.
This slot receives a fulcrum block a pivoted by means of a
pin or pivot a³ to a bracket a. The bracket supports a short shaft a³
to one end of which is secured a wheel or disc a. This wheel or disc
has extending across its face a¹º a cross recess or way a which receives
a roll carried by a pin a¹ upon the end of the eccentric lever a². The
motion of the eccentric, while it oscillates the lever upon its fulcrum, also draws or
moves the lever relatively to the fulcrum, so that the end of the lever carrying the
roll is shortened and lengthened and of course moves at varying speeds according
as its position in relation to the fulcrum point varies.
This irregular movement of the lever is communicated to the wheel or disc a' by
means of the roll connecting the lever end with it, and this roll is caused to traverse
the recess or way all while the wheel is rotating, so that the relation between the
centre of the wheel and the roll is constantly varying, and there is thus communi-
cated to the wheel a variable speed which is easy, regular, well balanced and one
that can be used at a high rate of speed. The motion of this wheel a³ is trans-
mitted to the whirl carried at the upper end of the horn B by means of the bevel
gear b on the shaft a³, the bevel gear 6' on the vertical shaft 6 and the intermediate
connections common to this style of machine.
In lieu of the eccentric, I can use any device for oscillating and reciprocating
the lever which will provide it with movements equivalent to that given by the
eccentric.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed as communicated to me
by my foreign correspondents I declare that what I claim is :-
The combination in a boot and shoe sole sewing machine of the kind above

page_text: specified, of the horn, the whirl carried thereby and rotated continuously in one
direction at varying speed by mechanism combined therewith, and comprising the
shaft a, the eccentric thereon, the reciprocating and oscillating lever a' operated by
the eccentric and having at its other end a pin or roll, a wheel a' upon a shaft
connected with the whirl, and having a cross way in which the lever roll or pin
extends and slides, as and for the purposes described.
Dated this 26th day of September 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.