Improvements in Sewing Machines.
Year: 1893

page_text: Date of Application, 18th Feb., 1893-Accepted, 18th Mar., 1893
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
We Messrs. BRADBURY AND CO. LIMITED of Wellington Works Oldham in the
County of Lancaster Sewing Machine Manufacturers, and CHARLES SHAW, of
the same place, Foreman, 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 more particularly to that class of sewing machines (used
principally for sewing boots and shoes) wherein the work support consists of an arm,
of a cylindrical form, and especially to the "fecder" mechanism of such machines.
The nature of the said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference to
the annexed sheet of drawings and the following explanation thereof.
Fig. 1 on the drawings is a vertical transverse section and Fig. 2 a vertical
longitudinal section of so much of a sewing machine as is necessary to illustrate the
construction and application of the improvements thereto.
Fig. 3 is an end view of the workarm and adjustable ring hereinafter described.
a is the main frame of the machine and a¹ the cylindrical arm thereof which forms
the work support.
The invention comprises a hollow shaft c working in suitable bearings in the said
cylindrical arm a¹; the said shaft c has a "feeder" wheel c' fixed on the end thereof
nearest to the needle. This wheel c¹ has pointed teeth cut upon its periphery to
grip and carry the work forward.
The other end of the shaft c is fitted with a flanged disc d and the whole shaft
is rotated by means of a feed-dog e operating on the flange or rim of the disc d.
The feed-dog e receives its motion from a feed lever which in its turn is
actuated by a cam fixed on the crank or driving shaft h.
The feed-lever is fitted with links i and has an adjustable axis j to allow of
more or less movement of the lever end as may be required for lengthening or
shortening the stitch.
The hollow shaft c is fitted internally with a looper shaft k carrying a looper / at
the end nearest the needle for the purpose of taking up the loop of the needle
thread and passing it round the spool containing the under thread.
On the other end of the internal shaft k is fixed a disc m to which is attached a
crank pin n on which works the lower end of a pitman o connecting the said shaft k
with the crank or driving shaft h above from which it receives its movement.
The work support or cylindrical arm a' is fitted with a hollow ring or oval plate p
(see also Fig. 3) which serves also as a needle plate. This ring or plate p is
attached to the end of the cylindrical arm a' by means of two screws q passing
through slotted holes, and it can be raised or lowered at will to suit the class of
work to be sewn by means of a screw r. The ring p is also fitted with a hinged
doors for keeping the spool and case in proper position whilst the machine is in
operation. is a latch for securing the door s.
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 :-
First A sewing machine having the work-support in the form of a hollow
cylindrical arm, in which works a hollow shaft fitted at one end with a feed wheel
substantially as hereinbefore described and illustrated by the annexed drawings.
Secondly-In a sewing machine having a work support in the form of a hollow
cylindrical arm the combination with a hollow feed wheel shaft working therein, of a

page_text: looper shaft working inside the said hollow feed wheel shaft substantially as herein-
before described and illustrated by the drawings annexed.
Thirdly-In a sewing machine having a work support in the form of a hollow
cylindrical arm, the combination with the free end of such arm of a hollow ring
acting as a needle plate, and secured to such arm by screws or otherwise so that it
can be adjusted in height to suit the material being sewn substantially as
hereinbefore described and illustrated by the drawings annexed.
Dated this 16th day of February 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.