IMPROVEMENTS IN SEWING MACHINES
Year: 1876

page_text: LETTERS PATENT to Christian Friedrich Harbeck, of the Firm of Guhl and
Harbeck, of Hamburg, Germany, Sewing Machine Manufacturers, for the
Invention of "IMPROVEMENTS IN SEWING MACHINES."
Scaled the 28th October 1876, and dated the 28th April 1876..
PROVISIONAL SPECIFICATION left by the said Christian Friedrich Harbeck.
at the Office of the Commissioners of Patents on the 28th April 1876.
CHRISTIAN FRIEDRICH HARBECK, of the Firm of Gull and Harbeck, of Ham-
burg, Germany, Sewing Machine Manufacturers. "IMPROVEMENTS IN SEWING
MACHINES."
These improvements relate to a particular arrangement or combination of
mechanical parts by means of which the two horizontal shafts which give motion
to the needle and looper or other stitch forming mechanism are actuated. In this
Invention the fly wheel, which may be driven either by the hand or foot, is carried
upon a stud passing through the standard of the machine, and a box frame which
encloses the principal moving parts. The fly wheel has upon its inner face a small
spur wheel, which gears with a pinion fixed upon the backward end of the upper
or needle actuating shaft. Immediately in front of this pinion and fitted on the
shaft is an eccentric, which carries an arm extending downwards to the lower or
secondary shaft that actuates the looper or other stitch forming mechanism. This
arm is a flat piece of metal, and has an opening or slot made in it at the central
part to admit of the stud of the fly wheel passing through it. Below this slot
there is a projecting piece, which carries at its lower end a pin, which takes into and
traverses a slot or groove formed in a cam that is fixed on the end of the lower
shaft, or that which actuates the stitch forming mechanism in conjunction with the
needle above the work plato of the machine. Thus with this combination of
mechanical parts when the fly wheel is put in motion the upper shaft by means of
the arm or prolongation, and the slotted cam causes the lower shaft to rotate in
the opposite direction, and thus give motion simultaneously to the needle and looper
or other stitch forming mechanism.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Christian Friedrich Harbeck in the Great Seal Patent Office on the
28th October 1876.
CHRISTIAN FRIEDRICH HARBECK, of the Firm of Guhl and Harbeck, of Ham-
burg, Germany, Sewing Machine Manufacturers. "IMPROVEMENTS IN SEWING
MACHINES."
These improvements relate to a particular arrangement or combination of
mechanical parts by means of which the two horizontal shafts which give motion
to the needle and looper or other stitch forming mechanism are actuated. In this
Invention the fly wheel, which may be driven either by the hand or foot, is carried
upon a stud passing through the standard of the machine, and a box fraine which
cncloses the principal moving parts. The fly wheel has upon its inner face a small
spur wheel, which gears with a pinion fixed upon the backward end of the upper
or needle actuating shaft. Immediately in front of this pinion and fitted on the
shaft is an eccentric, which carries an arm extending downwards to the lower or
secondary shaft that actuates the looper or other stitch formning mechanism. This
arm is a flat piece of metal, and has an opening or slot made in it at the central
part to admit of the stud of the fly wheel passing through it. Below this slot there
is a projecting piece, which carries at its lower end a pin, which takes into and
traverses a slot or groove formed in a cam that is fixed on the end of the lower
shaft or that which actuates the stitch forming mechanism in conjunction with
the needle above the work plate of the machine. Thus with this combination of
mechanical parts when the fly wheel is put in motion the upper shaft by means of
the arm or prolongation and the slotted cam causes the lower shaft to rotate in
the opposite direction, and thus gives motion simultaneously to the needle and
looper or other stitch forming mechanism. With this arrangement of the moving
parts the motion of the principal moving part of the machine is simplified to the
utmost extent, and at the same time the cost of construction is also reduced, and the
machine is rendered easier to work.
Having now described and ascertained the nature of my said Invention of
improvements in sewing machines, I wish it to be understood that what I claim
and desire to secure by the herein-before in part recited Letters Patent is, the
mechanical combination or arrangement of the eccentric on the upper or needle
actuating shaft, and the slotted disc or cam on the secondary shaft which actuates
the looper or other stitch forming mechanism as herein-before described.
In witness whereof, I, the said Christian Friedrich Harbeck, have hereunto set
my hand and seal, this Twenty-eighth day of October, in the year of our
Lord One thousand eight hundred and seventy-six.
C. F. HARBECK. (LS)