Improvements in and relating to Bobbin or Bobbin Case Holders for Sewing Machines.
Year: 1891

page_text: Date of Application, 21st July, 1891-Accepted, 5th Sept., 1891
COMPLETE SPECIFICATION.
Improvements in and relating to Bobbin or Bobbin Case Holders
for Sewing Machines.
We, HENRY SALEM Shaft, residing at No. 28 Washington Street, Machinist
JOHN WILLIAM RICKS, residing at No. 170 West Fulton Street, Machinist and
HARLAN PAGE SHUTTS, residing at No. 25 West Fulton Street, Merchant, in the
City of Gloversville, County of Fulton, and State of New York, one of the
United States of America, Citizens of said United States of America, 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 this invention is to provide a readily operable holder for the
bobbin or spool used in that class of sewing machines known as "rotary hook."
For convenience of description we have illustrated our invention in connection
with the "Standard" sewing machine modified by the application thereto of the
rotary hook forming the subject of a separate application for Patent of even date
with this.
In those bobbin holders or bobbin case holders where the movable member of
the holder is acted upon by a spring, the spring is not always reliable to hold the
movable member in such relation to the bobbin case as to keep it true and prevent
chattering. So also, pressure is not put upon the bobbin case in proportion to the
number of thread used in the machine.
Now our invention is designed to obviate both of these difficulties and to provide
a bobbin or bobbin case holder which may be readily operated to receive and
discharge the bobbin case.
We will now proceed to describe the principle of our invention and to point out
the best mode in which we have contemplated applying that principle, and then
will particularly point out and distinctly claim the part or improvement which we
claim as our invention.
In the accompanying drawings illustrating the invention, in the several figures of
which like parts are similarly designated-
Figure 1 is a front elevation of the head of a "Standard" sewing machine with
our inventions applied thereto.
Figure 2 is a bottom plan view of the bobbin holder detached, the parts being in
position for containing the bobbin case.
Figure 3 is a top plan view of the bobbin holder, the movable member of which
is open to receive or discharge a bobbin ; and
Figure 4 is a section taken in the plane of line x-x, Figure 2.
The head, a, having the needle bar, b, needle, c, the various thread guides,
tensions, d, and e, and take-up, f; the presser-bar, g, presser-foot, h, and a
lifter, ; and feed dog, j, and their moving parts may be as in the "Standard
sewing machine.
"
On the main shaft is applied the rotary hook, k, of our invention before-
mentioned; and we have shown in Figure 1, the parts in position where the rotary
hook is just about to discharge a needle-thread loop.
Our holder is composed of a base, 1, which is pierced in order to permit the
passage of fastening devices to secure the same to the underside of the bed-plate
A right-angled arm, "", depends from this base, and another arm, ², projects from
the arm, l, at right angles towards the main shaft. On one end of the arm, l, is
fixed a stationary half, m, of the bobbin or bobbin case holder. The movable
member, m³ is provided with a stem, m², and this stem is supported in a swinging
arm, n, which is pivoted at n', to the arm, P. The arm, n, is made with a hub, n,

page_text: to receive the stem, m², of the member, m³, and a set-screw, o, is passed into this
hub to bear against the stem, m², to hold the said stem and its attached member, n',
in adjusted position nearer to and farther from the fixed member m. For additional
security, I prefer to thread the outer end of the stem m³, and apply thereto a nut
or jam-nut, p. The arm, n, has a slotted segment, n³, at its outer end, and this
segment is engaged by a butterfly or other screw, q, tapped into the arm, 13, to hold
the arm, n, in adjusted position.
The members, m, and m³, are lined internally with linings, r, r, of leather or
other soft material, to prevent chattering and undue wear of the bobbin case.
As already intimated, when it is desired to insert a bobbin case and bobbin, the
butterfly screw, g, is loosened so as to permit the arm, n, with its attached movable
member, n', to be swung into the position shown in Figure 3, and then when the
case or bobbin has been placed between these two members, the arm, n, is swung
back into the position shown in Figure 2, and the butterfly screw turned up and
the arm, n, thereby clamped to the arin, 1, and the parts secured.
In order to adjust the members, m, and m³, to the bobbin case or bobbin, the
screw, o, and nut, , are loosened, and the said member, m¹, moved back or forth
in its hub, n², to the proper position, and then the screw, o, and nut, p, are made
fast again.
It will be seen, thus, that the disadvantages of a spring for holding the movable
member on the bobbin or bobbin case holder are obviated.
Obviously, we do not limit our invention to its application to the "Standard,"
or, in fact, to any particular kind of machine, but, as already indicated, have
selected this form of machine for illustration simply. The principle of the
adjustable and positively moved and locked bobbin holder is applicable to bobbin
holders adapted for other forms of bobbins or bobbin cases than those commonly
used in the "Standard" and like machines.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. A bobbin or bobbin case holder for sewing machines composed of an arm by
which the holder may be secured to the machine bed, a fixed member on said arm,
an arm pivoted to the first named arm and provided with a hub, the movable half
of the holder provided with a stem inserted in said hub, and means, substantially
as described, for effecting the adjustment of the said stem and its member, and
means to hold the movable member in proper relation to the fixed member, sub-
stantially as set forth.
2. A bobbin or bobbin case holder for sewing machines, consisting of an arm by
which the holder may be attached to the sewing machine bed, a fixed member
attached thereto, and an independent movable member adjustably arranged in an
arm pivoted to the first-named arm, substantially as described.
Dated this 21st day of July 1901.
AVVA
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.