Improvements connected with Sewing Machines.
Year: 1893

page_text: Date of Application, 18th Oct., 1893
Complete Specification Left, 11th May, 1894-Accepted, 30th June, 1894
PROVISIONAL SPECIFICATION.
Improvements connected with Sewing Machines.
I, GEORGE SAWYER, of 48 Holborn Viaduct, in the City of London, Sewing
Machine Manufacturer, do hereby declare the nature of this invention, which has
been communicated to me from abroad by The White Sewing Machine Company,
of Cleveland, Ohio, United States of America, to be as follows:-
This invention relates to improved means or appliances for regulating and
determining the tension of the thread from the head of a sewing machine, said
tension being removable by the presser foot lift lever, in order that the thread may
be readily drawn from the reel when a piece of work is completed, the tension not
being otherwise affected, such as when the presser rises while seams, or extra
thicknesses of fabric' are passing under it.
For the purpose of this invention, the head or front plate has an aperture which
is covered by a disc. The head of a centre stud projects in front of the disc
sufficiently to steady, or act as a centre for a spring plate, which is fitted to the
front plate of the head, said spring being capable of moving to the front and
away from the disc by a cam on the presser lever acting against a bent end which
is slotted for a straight to and fro motion on a guide pin.
The arbor of the disc has on the inside, one end of a plate spring affixed, said
spring being slipped over a pin to locate it in the head of the machine. The other
end of the plate spring is free, and stands slightly away from the head, and is
capable of pressure by an eccentric stud pin, the button of which is at the side, and
provided with an index finger to work over or against a scale or vernier plate for
adjusting and indicating the tension desired at a glance.
The front spring or tension plate has a slot with a curved tongue for looping the
thread under, and by which the nip on the thread is obtained between the front
tension plate and back disc.
Dated this 18th day of October 1902
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said George Sawyer.
COMPLETE SPECIFICATION.
Improvements connected with Sewing Machines.
I, GEORGE SAWYER, of 48 Holborn Viaduct, in the City of London, Sewing
Machine Manufacturer, do hereby declare the nature of this invention, which has
been communicated to me from abroad by The White Sewing Machine Company,
of Cleveland, Ohio, United States of America, 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 improved means or appliances for regulating and
determining the tension of the thread from the head of a sewing machine, said
tension being temporarily releasable by the presser foot lift lever, in order that
the thread may be readily drawn from the reel when a piece of work is completed,
the tension not being otherwise affected, such as when the presser rises while seams
or extra thicknesses of fabric are passing under it.

page_text: For the purpose of this invention, and as will be understood by the annexed'
drawings, Figure 1 is a right side elevation of a sewing machine front or face plate.
Figure 2 a back interior elevation. Figure 3 a front exterior view. Figure 4 a
plan section on the line ab of Figure 3. Figure 5 a left hand side elevation, and
Figure 6 view of details.
The front plate A has an aperture B which is covered by a disc C. The head
of a stud D projects in front of the disc C sufficiently to steady, or act as a centre
for a spring plate E, which is fitted to the front plate A of the head, said spring E
being capable of moving to the front and away from the disc C by a cam F on the
presser lever G acting against a beut end H which is slotted for a straight to and
fro motion on a guide pin I.
The stud D of the plate E has on the inside, one end J of a plate spring K affixed,
said spring being slipped over a pin L to locate it in the head A of the machine. The
headed stud D is screw threaded at its opposite end and is nicked for the insertion
of a screw driver to loosen, or to tighten it in the washer nut D', the square of
which engages in an opening J' of the spring plate K for adjustment of grip on the
The other
thread by the disc C and plate E, between which the thread is drawn.
end M of the plate spring K is free, and stands slightly away from the head, and
is capable of pressure by an eccentric stud pin N, the button P of which is at the
side, and provided with an index finger to work over, or against a scale, or
vernier plate R for adjusting and indicating the tension desired at a glance.
The front spring, or tension plate E has a slot S with a curved tongue T for
looping the thread under, and by which the nip on the thread is obtained between
the front tension plate E and back disc C.
The thread is carried from the top spool down the front of the head, and passed
under the hook T which is bent outwardly to receive it, and from thence through
the slot S to the "take up" and down to the needle.
The thread is put in tension by the disc C and spring plate E, the pressure of
the disc and plate respectively being governed by a spring K due to the movement
of the finger Q and its eccentric N. This tension pressure is permanent, and
permits the presser lever G to free the thread from the nip when G is lifted, and to
return the nip on the lowering of the lever G.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is :--
1. The combination of appliances C, D, E, K, N, T, and their method of action,
as hereinbefore described, as a thread tension adjuster and releaser, and a re-setter
of the tension, as set forth.
2. Providing a thread tension device of a sewing machine with means for
releasing the thread, and again putting it in tension by the movement of the presser
_foot lever, as set forth the several parts being arranged as illustrated in the
annexed drawings.
3. In a sewing machine, the release of the grip upon the thread by a movement
of the presser and a replacing of the same tension when the presser is reversed,
substantially as set forth.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said George Sawyer.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said George Sawyer.