IMPROVEMENTS IN SEWING MACHINES
Year: 1878

page_text: LETTERS PATENT to Marshall Henry Pearson, of Leeds, in the County of York,
for the Invention of IMPROVEMENTS IN SEWING MACHINES."
"
PROVISIONAL SPECIFICATION left by the said Marshall Henry Pearson at
the Office of the Commissioners of Patents on the 3rd August 1878.
MARSHALL HENRY PEARSON, of Leeds, in the County of York.
MENTS IN SEWING MACHINES."
" IMPROVE-
My improvements have reference to sewing machines for boots and shoes, and
consist in dispensing with the gearing employed for giving the required rotation or
partial rotation of the looper thread carrier or whirl described in the Specifications
of Letters Patent granted to John William Ford, No. 1113, dated 16th April 1862,
and to George Haseltine, No. 2113, dated 27th August 1864.
The object of the Invention is to retain the relative position of the looper thread
carrier or whirl to the needle without regard to the position which the horn is
made to assume, and also its rotation or partial rotation round the needle in the
exercise of its functions.
The horn is of ordinary construction, and in order to give the required circular
motion round the needle to the looper I transmit motion thereto froin an eccentric
or crank, such motion being transmitted through a curved or elbow piece, to which
the looper is attached, and in order to steady and perfect the required motion I
provide a supporting arm for the curved or elbow piece.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Marshall Henry Pearson in the Great Seal Patent Office on the
29th January 1879.
MARSHALL HENRY PEARSON, of Leeds, in the County of York.
MENTS IN SEWING MACHINES."
"IMPROVE-
My improvements have reference to sewing machines for boots and shoes, and
consist in dispensing with the gearing employed for giving the required rotation or
partial rotation of the looper thread carrier described in the Specification of Letters
Patent granted to John William Ford, No. 1113, dated 16th April 1862, and to
George Haseltine, No. 2113, dated 27th August 1864.
The object of the Invention is to retain the relative position of the looper thread
carrier to the needle without regard to the position which the horn is made to
assume, and also its rotation or partial rotation round the needle in the exercise of
its functions.
The horn is of ordinary construction, and in order to give the required circular
motion round the needle to the looper I transmit motion thereto from an eccentric
or crank, such motion being transmitted through a curved or elbow piece, to
which the looper is attached, and in order to steady and perfect the required motion
I provide a supporting arm for the curved or elbow piece..
And in order that my Invention may be more completely understood, reference
is given to the accompanying.Drawings and to the letters and marks thereon:
Fig. 1 represents a longitudinal section; Fig. 2, a transverse section through
A B; Fig. 3, a plan looking at the top.
a is the horn, which may be of ordinary construction, and b is the looper thread
carrier; and in order to give the required circular motion round the needle c I
employ the curved or elbow piece d for transmitting the same thereto, such motion
being obtained from a crank or eccentric e, actuated through the vertical shaft f, a
rotary motion being imparted to the shaft f from some suitable motive power.
In order to support the curved or elbow piece d I provide the supporting arm g,
mounted on the shaft h in suitable bearings on the horn a. The sliding part i is
employed for steadying the upper portion of the curved or elbow piece d and sup-
porting arm g.
By this arrangement of apparatus I dispense entirely with bevel gearing, and act
upon the looper thread carrier direct from the vertical shaft through curved or
elbow piece d; at the same time I retain the relative position of the looper thread
carrier b to the needle c without regard to the position which the horn is made to
assume, and also to its rotation or partial rotation round the needle b.
The horn a is rotated by the attendant, but when heat is applied thereto I employ
by preference the hand wheel J, whereby the attendant may move the horn a
without injury from the heat thereof.
Having now described the nature of my said Invention, and described with the
aid of Drawings how the same may be carried into practice, I would have it under-
stood that I do not limit myself to the precise details or configuration of the parts
I have described and shewn, as the same may be varied or modified without
departing from the nature of my said Invention, but what I claim and desire to be

page_text: secured to me by Letters Patent is, the arrangement, construction, and application
of curved or elbow piece, and parts connected therewith, for giving the required
rotation or partial rotation to the looper thread carrier; substantially as and for the
purposes herein set forth.
In witness whereof, I, the said Marshall Henry Pearson, have hereunto set
my hand and seal, this Twenty-seventh day of January, in the year of our
Lord One thousand eight hundred and seventy-nine.