Year: 1887

page_text: Date of Application, 15th Mar., 1887
Complete Left, 16th Jan., 1888
Complete Accepted, 17th Feb., 1888
I, WALTER SHELVERTON FROST of No. 92 Copeland Road Peckham, London, in
the County of Surrey, Engineer do hereby declare the nature of this invention to be
as follows:-
The object of my invention is to construct small lock stitch Sewing Machines in
such, simple form and yet be most efficient whereby the improved parts may be easily
and cheaply manufactured.
In carrying out my invention I propose to place horizontally a shaft or axle
through the arm of the machine, the said shaft at one end being provided with an
ordinary hand wheel or handle, at the other end is fitted a crank or disc carrying a
pin which works the needle bar by means of a suitable cam made in the needle bar to
give the desired motion to the needle the said needle bar and cam being made in one
piece.
In the upright part of the arm I place a vertical shaft or axle driven by the
horizontal shaft by means of beveled wheels, the end of the vertical shaft under
the bed plate of the machine is fitted with a crank or disc carrying a pin like that of
the horizontal shaft.
I place under the bed plate, an oscillating lever mounted on a pin in about one
third of its length the short end being provided with a slot or quadrant in which the
pin of the crank or disc on the said vertical shaft being provided with a small friction.
block takes into and thus operating the lever.
The long part of the lever has at the end a shuttle carrier which works opposite a
semi circular web wall on the bed plate which carries a shuttle of simple form.
The said oscillating lover, quadrant, and shuttle carrier, being made in one piece.
At the back of the said semicircular wall, is fitted a feed dog made to work cross ways
of the bed plate, and is operated by a rod fitted at one end on the same crank or disc
pin that actuates the oscillating lever, and the other end of the said rod is provided
with compound tapers or angles working in a slotted guide placed at the extreme end
of the said rod by which means the required motion is given to the feed dog. I
provide the machine with the usual presser foot, presser bar, foot lifter guide, tensions
and take up all of simple construction.

page_text: For winding the shuttle bobbin I furnish a simple arrangement the frame being
made in one piece of sheet metal bent to form base plate, bobbin spring centre and a
bearing for the pulley and bobbin cup axle to run in, the frame is attached to the arm
side by a screw on which it is pivoted in such manner that when brought to a
horizontal position the pulley wheel which is provided with an india rubber tyre comes
in contact with the periphery of the hand wheel and is revolved through the means of
the contact therewith and is held in the horizontal position by a lock pin in
the arm.
I provide the machine with an automatic spring device for attaching the machine
to the table, consisting of one or two wire springs mounted on the bed plate of the
machine and extending round the edge and under the table.
Dated this 15th day of March 1887.
Improvements in Small Lock Stitch Sewing Machines.
I WALTER SHELVERTON FROST of 92 Copeland Road Peckham London in the
County of Surrey Engineer 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 object of my invention is to construct lock stitch sewing machines in a simple
and yet most efficient form whereby the improved parts may be easily and cheaply
manufactured.
In order to enable my invention to be fully understood I will proceed to describe
the same by reference to the accompanying drawings in which Fig. 1 represents an
elevation of my improved sewing machine, with the bed plate partly removed to shew
the under mechanisın.
Fig. 2 is a view of the machine from below illustrating the under mechanism more
clearly, Fig. 3 is a front view shewing the needle bar and cam arrangement, also the
automatic spring device or clamp for attaching the machine to a table. Fig. 4 shews
the construction in one piece of the oscillating lever K, slot or quadrant M and
shuttle carrier O. Fig. 5 shews the needle bar and operating cam constructed in one
piece. Similar letters in all the figures represent similar parts.
In carrying out my invention I place horizontally a shaft A through the arm B of
the machine the said shaft A being provided at one end with an ordinary hand wheel

page_text: or handle C, and carrying at the other end a crank or disc D provided with a pin E
which works the needle bar by engaging with a cam G made therein, and thus imparts
the desired motion to the needle H. The said needle bar F and cam G are preferably
made in one piece as shewn clearly in Fig. 5. This operating cam G is of the peculiar
shape shewn clearly in figs. 3 and 5, its curve from G to G fig. 5 being in the form
of a quarter of a circle of similar radius to the curve described by the crank pin E in
its revolution, so that when the needle is in its lowest position and the pin E is at the
point G the said pin will make a quarter of a revolution to the point G" without
moving the needle bar, since the curve of the cam from G' to G coincides with the
path of the said pin. The loop of thread is thus held by the needle during one quarter
of a revolution of the driving spindle in lieu of during one sixth only, thus affording
the shuttle plenty of time to pass through the loop of thread.
In the vertical portion of the arm B is a vertical shaft A' driven from the horizontal
shaft A through bevel wheels I, the end of this vertical shaft A', under the bed plate,
is fitted with a horizontal crank or disc D' carrying a pin E' and similar to the crank
or disc on the horizontal shaft A.
Under the bed plate J is the oscillating shuttle lever K working on a fulcrum L
preferably situated about one third of its length from the slotted or rear end. The
shorter portion of this lever is provided with the slot or quadrant M in which the
pin E of the crank or disc D' engages. This pin E' is provided with a small friction
block N and operates the lever K, the longer portion of which has at its end a shuttle
carrier O which carries a shuttle Q of simple construction and works against a curved
web or wall P stamped in one piece with the bed plate J, the curve of this wall P
corresponding to the are described by the shuttle when working. The said oscillating
lever K quadrant M and carrier O are all stamped in one piece. On the other side of
the said wall P is a feed dog R working transversely to the bed plate J and operated by
a feed actuating rod S worked from its rear end by the same crank pin E that actuates
the shuttle lever K. The opposite end of the rod S is provided with the vertical and
lateral inclines T fig. 1, and T' fig. 2, the rod and inclines being all stamped in one
piece. The front end of this feed actuating rod S passes through a slotted guide U,
and upon being moved forward by the rotation of the disc D', it receives an upward
motion by reason of the vertical incline T, fig. 1, passing over the bottom of the slot
in the guide U, and thus raises the feed dog R upon the under part of which it bears.
The forward motion of the rod S being continued the feed dog next receives a
horizontal movement through the lateral incline T¹, fig. 2, acting upon a suitable
projection R formed on the under part of said feed dog, thus moving the feed
forward. When the feed actuating rod S moves back again the feed dog R is moved
boil downwards and backwards by means of a suitable spring U till the end of the
feed dog comes in contact with the stitch regulator k as shewn in fig. 2.
I provide the machine with the usual presser foot V, presser bar W, guide
tensions Y, shuttlo cover i, and stitch regulator k, all of simple form and construction,
and also with the take up Z which is raised by the direct action of the needle bar F
and then left to be drawn down by the thread to the exact requirements of the
stitch.
For winding the shuttle bobbin I furnish a simple arrangement, the frame a of the
reel holder, its base plate the bobbin spring centre band the bearing c for the axle of
the pulley wheel d and bobbin cup e being preferably formed from one piece of metal
bent to the required shape. The frame a is attached to the arm B by a screw fon
which it pivots in such manner that when brought to a horizontal position the pulley
wheel d which is provided with an india rubber tyre comes in contact with the
periphery of the hand wheel and is rotated thereby, the frame a being maintained
in a horizontal position by a catch or projection g.
I provide the machine with an automatic spring clamp or clamps for securing it to
a table J¹, which clamp or clamps may be either hinged to the bed plate so as to be
capable of being turned up out of the way when not in use, or affixed rigidly thereto,
as shewn at h Fig. 2, the said clamp! or clamps being bent to somewhat of a U shape
and passing under and embracing the table J¹ as shewn at Fig. 3.

page_text: Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The peculiar needle bar operating cam G, so shaped as to cause the needle to
hold the loop of thread during one quarter in lieu of one sixth of a revolution only of
the driving spindle substantially as described and illustrated by figs. 3 and 5 of the
drawings.
2. In a lockstitch sewing machine the combination of the above mentioned needle
bar operating cam G with the peculiar combined shuttle and feed motion substantially
as described.
3. In a lockstitch sewing machine the combination of the shuttle actuating lover K
and carrier worked as described, and feed actuating sliding rod S provided with
vertical and lateral inclines and driven from the same horizontally rotating crank
pin E that works the shuttle lever K, substantially as described.
4. The peculiar form of feed actuating sliding rod S provided with vertical and
lateral inclines T and T¹, stamped in one therewith, for imparting both vertical
and lateral movement directly to the feed dog R substantially as described and
illustrated.
5. The shuttle actuating lever K, quadrant M and shuttle carrier O, all stamped in
one piece, substantially as described and illustrated.
6. The vertical curved web or wall P stamped in one piece with the bed plate J of
the machine substantially as described.
7. The combination with the bed plate J of the machine, of the peculiar spring
clamp or clamps h, either hinged or fixed rigidly thereto, substantially as described
and illustrated.
Dated 14th have of Tony 1000