Improvements in Tuck Creasers for Sewing Machines.
Year: 1892

page_text: Date of Application, 30th Aug., 1892-Accepted, 1st Oct., 1892
COMPLETE SPECIFICATION.
Communicated from abroad by THE SINGER MANUFACTURING COMPANY, of
.New York, in the United States of America, Sewing Machine Manufacturers.
Improvements in Tuck Creasers for Sewing Machines.
I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me to be
particularly described and ascertained in and by the following statement :—
My invention relates to that class of tuckers or tuck-forming attachments in
which a creasing arm, operated from the needle bar of the machine, or some other
suitable movable part, is caused, at each stitch to be forced against the material passing
over a small lip or projection directly beneath the operative end of the said creasing
arm; and the object of my invention is to provide a tucker or tuck-creaser, of the
class referred to, which will consist of few parts so that it may be cheaply manu-
factured; which will be compact and convenient for use, and which will be adapted
for some classes of work which cannot readily be performed upon the tuckers
heretofore in use.
In the drawings Fig. 1 is a front side view of my improved tuck-creaser.
Fig. 2 is a plan view of the same.
Fig. 3 is an end view looking from the left of Fig. 2.
Fig. 4 is a cross-section on line 4-4 Fig. 2.
Fig. 5 is a perspective view shewing details.
Fig. 6 is a detail plan view of the lower plate and attached parts, and
Fig. 7 is a detail plan view of the presser-foot and the plate or frame carried
thereby.
A denotes a presser-foot provided with the shank a for attachment to the
presser bar of a sewing machine. Integral. with or secured to the presser-foot A
is a plate or frame B provided at its forward side with ears and, the latter
of which has an overlapping portion through which, and the part immediately
beneath it, passes the threaded portion of a set screw C.
D denotes a plate having at one end a horizontally extending arm d, on which
is formed the creasing lip d', the said plate D having at its opposite end a
standard d', to which is suitably secured, as by riveting or otherwise, the rod E,
the said rod passing through the cars and 6 of the plate B. When the set
screw C is loosened the clamp formed by the part 62 is relaxed so that the rod E
is then free to be moved through the ears and 6 to adjust the creasing devices to
or from the needle which passes through the hole a' in the presser-foot A, and
when the said set screw is tightened the rod E, with the parts carried thereby, will
be rigidly secured to the plate B by the clamping ear b¹ forming part of said plate,
and will thus be rigid with the presser-foot.
Attached to the rear end of the plate D is a spring F, the forward end of which
presses upon the forward end of the said plate D, or upon the material which is to
be passed over it, the said spring being provided with a finger extending forward,
or toward the needle and in the direction in which the work or fabric is to be
moved, said finger serving to steady and hold the material which is to be operated
upon.
G denotes a vibrating or rocking bar provided with the arms and g" which
are suitably journalled upon the rod E, a set screw entering the forward end of
said rod, serving to hold the said bar G, and the parts connected therewith, in place
on said rod. The outer end of the arm g' extends over the creasing lip d' and is
provided on its lower face with a V-shaned groove to onerate in connection with

page_text: T
the said creasing lip to crease the material. The bar G is:normally held elevated
by a plate spring a attached to the plate or frame B, and impinging against the
underside of said bar G.
H denotes an operating device or lever consisting, as herein shown, of a piece of
wire coiled around the bar E and having two arms, the longer of which is
arranged to be engaged by the needle-bar or some projection carried thereby, and
the shorter of which is in contact with the bar G, the said lever, by the portion H
which is coiled around the bar E being thus journalled on said bar. To limit
the upward movement of the bar G by the action of the spring a, a notch is
formed in the ear. The shoulder at the upper side of said notch is engaged by the
rear end of the shorter arm of the lever H or by a portion of the coil encircling
the rod E. The operating lever H formed in the manner described, is thus, it will
be seen, a spring or yielding device so that the pressure imparted to the longer
arm thereof by the needle bar or other operating part will be yieldingly
veyed to the bar G against which the shorter arm of the said lever H impinges.
In other words the operating lever H will serve as a yielding connection between
the needle bar or other operating device and the bar G from which the creasing
arm g¹ is operated.
con-
Secured to the plate B so as to be adjustable thereon is a guide-carrying plate I
provided with a spring arm i at the free end of which is the edge guide, having
a suitable horizontal lip. The spring arm i, by which the guide is carried, is
an important feature of my device in that it permits the horizontal lip of the
guide to remain in contact with the throat plate when the presser-foot, by which
the entire attachment is carried; is lifted from the work; thus preventing the edge
of the work from getting between the guide and the throat plate of the machine.
The operation of my device is as follows:
The work is placed beneath the presser-foot of the machine in the usual manner
with the material lying upon the creasing lip d' and beneath the creasing arm g¹.
The machine being started, the needle bar descends and impinges against the lever H
which forces the bar G downward causing the creasing arm g' to come in contact
with the material lying upon the creasing lip d, thus forming a continuous crease
in the fabric as the work is fed along beneath the needle. The first tuck to be
sewed is usually creased by hand, but in sewing subsequent tucks the work is folded
upon the crease formed by the automatic creasing device, in the usual manner.
Owing to the construction of parts described my improved tucker is adapted for
very delicate work, particularly in the formation of what are known as " pin tucks,"
that is very fine tucks, the double portion of fabric of which 3½of an inch, or
less in width.
In thus making these very fine tucks, which are preferably made quite close
together, the guide is adjusted so as to be quite close to the line of the needle
and to the finger of the presser plate F, and the said finger will then rest upon
the goods upon the horizontal portion of the said guide, thereby holding the
work in place and permitting of its proper manipulation in sewing these very
narrow tucks in fine material.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, as communicated to me,
I declare that what I claim is :
1. In a sewing machine tucker or tuck-creaser, the combination with a plate over
which the material is to pass and which is provided with an arm or portion having a
creasing lip, of a creasing arm co-operating with said creasing lip, means for
operating said creasing arm, and a presser plate arranged to press upon the material
passing over the first named 'plate, said presser plate being provided with a 'finger f
which is in a'different vertical plane from the said plate over which the material
is'to pass, said finger being forward of the needle or the needle hole in the presser-
foot and extending towards the needle and in the direction in which the work is to
be moved.
.

page_text: 2. In a sewing machine tucker or tuck-creaser, the combination with a presser-
foot adapted to be attached to the presser bar of a sewing machine, of a plate B
rigid with said foot and provided with ears one of which is adapted to be com-
pressed and is thus a clamping ear, a set screw for compressing said clamping car,
a plate D provided with a creasing lip and also with a rod adapted to pass through
said ears, and a rocking bar G having arms journalled on said rod and one of which
co-operates with said lip as a creasing arm, and a yielding operating lever H to form
an elastic connection between said rocking bar and the machine needle bar or part
by which it is operated, and thereby yieldingly press the said creasing arm against
said creasing lip.
3. In a sewing machine tucker or tuck-creaser, the combination with the presser-
foot A, having a shank a, of a plate B rigid with said foot and provided with the
ears 6 and b, the plate D, provided with a creasing lip, the rod E attached at one
end to a standard on said plate and passing through said ears, a set screw for
compressing one of said ears around said rod, the rocking bar G provided with the
arms g and o journalled on said rod, and an operating lever H one portion of which
is coiled around said rod, said lever having a longer arm to be engaged by the
operating device, and a shorter arm to depress the said bar G, and a spring a² for
lifting said bar.
4. In a sewing machine tucker or tuck-creaser, the combination with a presser-
foot adapted to be attached to the presser bar of a sewing machine, of a plate B
rigid with said foot, and provided with cars, a plate D provided with a creasing
lip and with a rod adapted to pass through said ears, a set screw for securing said
rod and the plate D, with which said rod is connected, in a fixed position relative
to said plate B, the rocking bar G having arms by which it is journalled on said
rod and one of which serves as a creasing arm, and means for vibrating said bar to
operate the creasing arm.
Dated this 29th day of August 1892.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.