IN SEWING MACHINES."
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Marshall Henry Pearson at the
Office of the Commissioners of Patents on the 21st June 1880.
MARSHALL HENRY PEARSON, of Leeds, in the County of York.
IN SEWING MACHINES."
"IMPROVEMENTS
Firstly. My improvements have reference to what are known as "fair stitching"
machines, or machines for sowing the out soles of boots and shoes to the welt or
middle sole. In this arrangement I provide a curved needle mounted on the end
of a lover, which is pivotted on the top of or above a vertical shaft or "needlo
post." This shaft or "needle post" is capable of a rotary reciprocating movement
for the purpose of feeding the work, which movement is convoyed to the needlo
through the herein before mentioned needle lever, imparting thereto a lateral
reciprocating motion and thence to the work, such movement taking place after
the completion of the needle's downward stroke and whilst it is stationary, and the
sbuttle (which will be described hereafter) is taking the needle thread for the
purpose of locking it with its own. The radial reciprocating motion is imparted
to the vertical shaft, also that of the needle lever is produced from a cam or cams
mounted on driving shaft or other convenient moving part of the machine.
"
A light lever may be projected from the "needlo post' or other moving part
provided with a hole, through which the needle has to pass in its downward course
for the purpose of assisting and strengthening the needle in its lateral feed motion,
the movement of the needle and that of the light lever being simultaneous.
Secondly. The shuttlo is of a circular form hollowed out to receive the cop of
thread required for sewing. On the periphery of the shuttle is provided a point
or projection for taking hold of the needle thread. A rotary reciprocating motion
is imparted thereto from a cam, and transmitted through a toothed sector or
segment and gearing. The recess in the shuttle is covered by a suitable lid, on tho
front of which is provided a faced cam; in it is arranged a hole, through which the
shuttle thread issues. The object of the faced cam is to operate at suitable times
upon the needle and shuttle thread alternately for separating them whilst passing
each other. This arrangement has the effect of preventing the shuttle thread being
caught by the point or projection on shuttle.
Thirdly. The thread lever operates above the needle lover for the purpose of
drawing up the slack thread and completing the stitch. I by preference impart a
nositive motion to this from suitable cam.

page_text: Fourthly. The presser foot, which is employed for holding down the leather
whilst being sewn, is attached to the end of a lever mounted in suitable bearings
concentric with the needle lever. It is held down on the work by a powerful
spring, and relieved only when the feed motion is brought into operation by means
of a tappit arrangement.
The working parts are heated by gas or its equivalent.
This machine may be worked with a single thread. When such is the case I
substituto a revolving hook for the herein before mentioned shuttle.
The arrangement of the various parts may be varied or modified for the purpose
of sewing work other than "fair stitching" without departing from the general
scheme or nature of the Invention.
Fifthly. My Invention bas reference to imparting the requisito motion to tho
whirl or looper referred to in the Specification of the Letters Patent granted to mo
the 28th day of January 1879, No. 348, entitled "Improvements in Sewing
Machines."
My object being to impart an intermittent and variable motion to the whirl or
looper in the "horn" of the sole sewing machine.
•
For this purpose I provide elliptical or eccentric bevel gearing, to which motion
is imparted from the driving shaft and transmitted through other gearing and
shafting mounted in a diagonal direction, so as to bring the motion to the looper
shaft clear of the machine. The eccentric gearing may be applied at the bottom
of the looper shaft, or at a convenient point between it and the driving shaft.