An Improvement in Sewing Machines for Boots and Shoes.
Year: 1895

page_text: Date of Application, 15th July, 1895
Complete Specification Left, 12th Oct., 1895-Accepted, 23rd Nov., 1895
PROVISIONAL SPECIFICATION.
[Communicated from abroad by FRANK F. STANLEY, Principal Trustee of The
Stanley Manufacturing Co., of 108 Summer Street, Boston, Massachusetts,
United States of America.]
An Improvement in Sewing Machines for Boots and Shoes.
1, 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
---
My invention relates to sewing machines for boots and shoes and is an improve-
ment on the machine described in the Specification of the prior Letters Patent
No. 3346 of the year 1882.
In the said Specification gearing is described by means of which a continuous
rotary motion is transmitted from the main shaft to the whirl. No automatic
"throw-out or provision for slip is made in this gearing and consequently were a
nail or tack or other obstruction to become accidentally entangled between the
whirl and its driving pinion, the whirl or pinion would be broken or the machine
otherwise damaged.
According to the present invention I include a spring-controlled driving clutch
in the gearing for driving the whirl, and so arrange the clutch that under ordinary
circumstances it will drive the whirl, but should any dangerous obstruction enter
between the whirl and its pinion the clutch will slip and the whirl will be arrested
by the obstruction without damage thereto or to any other part of the machine.
For example referring to the aforesaid prior Specification I provide that the
gear wheel M at the base of the vertical shaft N, instead of being pinned or keyed
on said shaft as heretofore shall be loose on the shaft and I provide a spring-
controlled driving clutch which is keyed or set with a screw on the said shaft above
the loose gear wheel and which is so arranged as ordinarily to carry the loose gear
wheel with it and so drive the whirl. Should however any obstruction occur
between the whirl and its pinion the clutch will slip past the loose gear wheel
aforesaid without driving it so that injury to the whirl or other parts of the machine
will he prevented.
It is obvious that the driving clutch may be located in any convenient part of
the gearing.
The driving power which the clutch will transmit can be varied as desired by
adjusting the spring of the clutch which spring controls a projecting piece
adapted to engage, for driving purposes, with a projection on the loose gear wheel
aforesaid.
Dated this 15th day of July 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: An Improvement in Sewing Machines for Boots and Shoes.
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:-
This invention relates to sewing machines for boots and shoes and is an improve-
ment on the machine described in the Specification of the prior Letters Patent
No. 3346 of the year 1882.
In the said Specification gearing is described by means of which a continuous
rotary motion is transmitted from the main shaft to the whirl. No automatic
"throw-out" or provision for allowing slip exists in this gearing and consequently
were a nail or tack or other obstruction to become accidentally entangled between
the whirl and its driving pinion, the whirl or pinion would be broken or the
machine otherwise damaged.
According to the present invention I include a spring-controlled driving-clutch
in the gearing for driving the whirl, and I so arrange the clutch that under ordinary
circumstances it will drive the whirl, but should any dangerous obstruction enter
between the whirl and its pinion the clutch will slip and the whirl will be arrested
by the obstruction without damage thereto or to any other part of the machine.
In the accompanying drawings I have illustrated one mode of conveniently and
advantageously carrying this invention into practice.
Figure 1 is a side elevation of so much of a sewing machine as is necessary to
indicate how my invention may be applied thereto.
Figure 2 is a detached side view on a larger scale of the clutch and a portion
of the clutch shaft.
Figure 3 is a longitudinal central section of the clutch.
Figure 4 is a rear view of a gear wheel forming part of said clutch and showing
a detent or catch hereinafter described.
Figure 5 is an end view of the clutch with the aforesaid gear wheel removed,
and looking from below in Figure 3.
Like letters denote corresponding parts in the several figures.
The whirl A is driven from the main shaft of the machine through shafts B1, B2,
B3 B and B which are geared together by suitable gear wheels. Any other
suitable arrangement of driving shafts may be adopted. On the shaft B' is
arranged a spring-controlled driving-clutch, denoted in a general way by C, which
serves to drive the whirl without slip under normal conditions but which will slip
when any obstruction prevents the rotation of the whirl. The said clutch in the
particular example illustrated comprises a sleeve D firmly secured to the shaft B¹
by a screw D' or otherwise, and a gear wheel E which is loosely mounted on the
shaft B. Pivoted at D2 to the sleeve D is a lever F extending in the same
direction as the shaft B¹ and so constructed and arranged that one end of the lever
projects over the hub of the gear wheel E in close proximity thereto but without
making actual contact therewith. This end of the said lever rests on the bottom
of a groove or recess D³ in the sleeve D being kept in this condition by a spring F¹
interposed between the other end of the lever and the sleeve D. Recesses F2, D'
are provided in the end of the lever F and in the sleeve D respectively to receive
the ends of the spring F1 and to retain the said spring in position. The amount
of initial compression of the spring F¹ can be regulated by means of a screw F³
which screws through the lever F and bears on the end of the spring or on a
washer F interposed between the end of the screw and the spring. By turning
the screw in one or the other direction the force required to raise the opposite or

page_text: projecting end of the lever can be varied as desired.
crew F after the same has been adjusted as required.
F is a lock nut to lock the
Secured in the hub of the gear wheel E by means of a rivet or screw or dovetail
or other suitable fastening is a detent or catch G which projects beyond the surface
of the hub in a position to engage with the lever F. The said lever and the
detent or catch G are made of steel and their working faces are suitably hardened
to withstand wear. These faces are bevelled as indicated in Figures 4 and 5 to
allow of one slipping over the other when the whirl is prevented from turning.
When the shaft B' is rotated it carries with it the sleeve D and lever F and the
latter presses against one side of the detent or catch G of the gear wheel E and
rotates said wheel and thereby drives the shafts B2, B3, B and B and the
whirl A. Should however any obstruction occur between the whirl and its pinion
the lever F will slip past the detent or catch G without driving the whirl so
that injury to the whirl or other parts of the machine will be prevented.
It is obvious that the driving-clutch may be located in any convenient part of
the gearing.
The driving power which the clutch will transmit can be varied as desired by
adjusting the screw F³ which controls the compression of the spring Fl.
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 correspondent, I declare that what I claim is :-
1. In a sewing machine, a spring-controlled clutch situated at any convenient
part of the gearing for driving the whirl, said clutch being constructed to slip
or become disengaged when any obstruction occurs between the whirl and its driving
pinion, for the purpose specified.
2. The spring-controlled driving-clutch constructed substantially as described
with reference to the accompanying drawing and operating as, and for the purpose,
specified.
Dated LLIS 14th day
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.