Improvements in Sewing Machines for stitching sacks bags ships' sails carpet for other purpose
Year: 1888

page_text: Date of Application, 18th July, 1888
Specification Accepted, 31st Aug., 1888
I, WILLIAM WEBSTER, of Park Mills, Leeds, in the County of York, 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:
In the Specification of former Letters Patent granted to me No. 5521, dated
April 15th 1887, are described certain Improvements in Sewing Machines for stitching
sacks, bags, ships' sails, carpets, and for other like purposes.
Now my present invention relates to further improvements in machines of this kind
and has for object the production of such machines at less cost, and to construct them
so that they shall be almost silent in working and capable of being run at a greater
speed, thus enabling them to turn out more work in a given time than has heretofore
been usual.
In the accompanying 4 sheets of illustrative drawings the same reference letters
and numerals are used to denote the same or like parts, so far as they will apply,
as are used in the drawings forming part of the prior Specification hereinbefore
mentioned.
In describing my present improvements, references will be made to this prior
specification and to the drawings forming part thereof, and which for brevity will
be hereinafter called "old drawings."
Fig. 1. is a front elevation of the improved sewing machine according to my
present invention. Fig. 2. is a plan, or top view thereof, partly in section.
Fig. 3
is an elevation of the feeding end of the machine, Fig. 4. an elevation of the delivery
end. Fig. 5, is a back elevation, Figs. 6, and 7, are detail views to an enlarged
scale, (the latter in section) shewing a face view of the fixed headstock b, with the needle
race c, needle a 4, cam, levers and rollers 9, 9, actuated by the cam h, axles e, e, and
driving arms ff, these latter arms being fitted with my improved driving points f2, f2
which are replaceable when worn out. Fig. 8, shews the development of the needle a 4.
Fig. 9. shews to an enlarged scale, mechanism for disengaging and re-engaging the
rack pinion d 5, to admit of the advance of the thread cylinder s.

page_text: My present Improvements are as follow:-Instead of the toothed gearing k, l, m, n,
shewn in my old drawings for driving the take up or thread cylinder at a greater speed
than the needle, I drive the said cylinder direct by means of a belt which passes from a
pulley 2 on the driving shaft to the pulley n. This pulley takes the place of the
toothed wheel n, shewn in the old drawings and is fixed upon the sleeve n 1. which
passes through the bearing o. This sleeve has an internal feather or its equivalent
which takes into a groove in the shaft r, (or on to a flat thereon,) of the thread
cylinder s, and serves to drive this shaft.
Instead of imparting an intermittent feed motion to the material to be sewn, by
means of the drunken worm & 1, shewn in the old drawings, I use, according to my
present invention, a regularly pitched worm 1, Figs. 1, 2, 3, and 5, which communi-
cates a continuous motion by means of the worm wheel c 1, shaft d 1, and chain wheel e 1,
to the endless feed chain f1. Also instead of imparting intermittent retiring motion
to the thread cylinder s, as described in the abovenamed former Specification and
shewn in the old drawings, I impart a continuous motion as follows:-On the
shaft d1, is a pinion d2, this drives a wheel d3, through the sleeve of which passes the
shaft d4, and by which the said shaft is driven. On one end of this shaft is mounted
a pinion d 5, that takes into a rack d 6, fixed to the sliding bar y, (an equivalent to the
bar y, in the old drawings) to which is connected an arm 1, Figs. 2, and 3.
To the other end of the said sliding bar y, an arm y 2, is connected for actuating
the travelling guide rest z, in following up the now continuous retirement of the
thread cylinders.
The pinion d5, on the shaft d 4, is changeable and the rack d 6, adjustable thereto
in order to obtain a variation in the speed of the retirement of the thread cylinder s.
On the complete retirement of the thread cylinder and the exhaustion of the thread in
use for the time being, the advance of the cylinder is effected either by the handle b 2,
or by the spring 63, when the rack pinion d5, is disengaged from the rack d6;
the dotted lines d 7, Fig. 9, shew the position of rack pinion when so disengaged.
The said pinion is caused to re-engage with the rack by the action of the spring d8,
after the advance of the thread cylinder has taken place. The continuously retiring
and advancing motion of the thread cylinder and the guide rest just described, enable
me to dispense with the following parts employed in the arrangement shewn in the
old drawings for causing the intermittent motions of the thread cylinder and
guide rest, namely:-the wheels k, l, m, n, p, q, crank stud t, link u, lever v, pawl w,
rachet wheel, bar y with screw y 3, nut segment y 4, and handle y.5, and also
to run the machine much quicker and with considerably less noise than heretofore.
According to the arrangement described and shewn in my former Specification
hereinbefore referred to, the pressure foot a 2, was raised by hand on the introduction
of new work.
In order that the operator may have both hands at liberty at this time, according
to my present invention I raise the pressure foot by means of a treadle a.5, as
shewn in Figs. 1, 4, and 5, against the pressure of the spring a 6.
The extremities of the needle driving arms shewn in the old drawings are made in
one with the said arms, and being somewhat delicate are liable to be soon worn out,
and are rather costly to replace.
To obviate these objections I now construct the driving points or projections 2,
separately from the arms f, and provide in each of the latter a suitable recess for.
receiving one of such driving points or projections which is fixed in place by rivetting
or otherwise so that a duplicate part can be readily substituted when required.
Portions of the improved machine not shewn in the old drawings, are shewn in
Figs. 1, 2, 3, 4 and 5, as follows, a are legs or standards, 64, is a driving shaft,
65, 66, are fast and loose driving pulleys, 67, is a treadle in connection with
mechanism for shifting the belt from the loose pulley 66, to the fast pulley 65,-68,
a spring for raising the treadle and shifting the strap back on to the loose pulley 66,
when it is required to stop the machine,- 2, a pulley for driving the thread cylinder
at a greater speed than that of the needle, and c4, a pulley for propelling the
needle driving carriage d.
1. I

page_text: The treadle for raising the pressure foot, and the spring for causing the advance of
the thread cylinder are also additional and have been herein before referred to.
Having now particularly described and ascertained the nature of my said Inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is
1. In an overedge sewing machine, the arrangement substantially as hereinabove
described for imparting to the take up thread cylinder 8, rotatory motion at a speed
exceeding that of the needle.
2.--In an overedge sewing machine, the application and use of continuous feed
mechanism substantially as hereinabove described.
3. In an overedge sewing machine, an adjustable continuous retiring motion
substantially such as hereinabove described for imparting continuous retiring motion
to the thread cylinder s. and travelling guide rest =.
4. In an overedge sewing machine, a treadle adapted to raise the pressure foot on
the introduction of the material to be operated upon substantially in the manner
described and shewn in the drawings.
5. Providing the driving arms f, with renewable driving points or projections
adapted to be applied and secured to the ends of the said driving arms substantially
as described and shewn in the drawings.
6.-The improved overedge sewing machine constructed, arranged, and operating
substantially as hereinbefore described and shewn in the drawings annexed.
.
2 T1
1000
Date Fay of buy
Witness,
THOS. E. CRAVEN, (.E., Fel. Inst. Patent Agents,
24, Victoria Chambers, Leeds.
WILLIAM WEBSTER.