Year: 1886

page_text: I, GEORGE MACAULAY-CRUIKSHANK of 62 Saint Vincent Street, Glasgow in the
County of Lanark, Fellow of the Institute of Patent Agents do hereby declare the
nature of this invention (a communication to me from abroad by Johannes Albrecht
of Cannstadt in the Empire of Germany) and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This machine is adapted for the sewing of boot soles with two waxed threads,
one of which is wound on a bobbin below and the other is contained in an
oscillating shuttle above the table carrying the work.
On the accompanying drawings figure 1, is a front elevation of the machine
constructed in accordance with the invention figure 2 is a side elevation and
figures 3, 4, and 5 sections through the machine in front of the cams g, and U
whilst figures 6 and 7 are details of the mechanism; figure 8, shows the manner
of making the stitch; figure 9, is a section on the line A, B, figure 2; and figure 10
a section on the line B, C, figure 4.
The mechanism consists of a main shaft a, whereon are keyed three cams from
which motion is imparted to the various parts of the machine. On a second shaft b
there is provided an oscillating needle holder c which is loose on the shaft and also
an awl holder d, which reciprocates with the shaft. The needle head o, and the
awl-head d receive motion from the cam g, through levers e, f centred on a shaft W
at the back of the machine and in front of the shaft b, a table i, is fixed to the
frame, a presser K secured to a holder K¹ carried on the shaft b being situated
above the said table. The presser is forced against the material on the table by a
lever, one end of which is in contact with a heel K' on the holder K¹, whilst its
other end is so acted upon by a spring m as to lift the heel K' and move the
presser towards the table i. The presser is moved in the opposite direction or
lifted slightly from the table i by the cam n which acts upon a roller centred on a
lever o, the under end of the lever being provided with a pawl o¹, which acts in
teeth or notches on the heel K' as seen at figure 2.
.
As shown more particularly at figure 7 one end of the shaft b, is jawed and one
extremity of a lever p is inserted in the recess and fixed in position by a screw or

page_text: pin. The lever has its fulcrum at p¹ and its rear end is acted upon by the cam n,
so as to reciprocate the shaft b with its awl-head d, the length of one stitch
forward.
A plate or web extends across the upper front part of the frame of the machine
and in it a stud is fixed a lever being centred upon the said stud. One end
of the lever supports an oscillating shuttle S, the shuttle being held between two
jaws as more particularly seen at figure 4 so as to be easily capable of removal for
refilling.
.
The thread is wound into an egg-shaped ball and merely laid in the shuttle
which is closed by a small cover, the end 2, of the thread being drawn through a
small hole in the shuttle as seen at figs. 1, 4 and 6.
The lever r is connected to the bell crank lever t, centred at t¹, and receiving
oscillating motion from the cam U. On another stud h¹ fixed in the front frame
plate a lever h is centred the said lever having at its upper end a roller h³ which
is pressed against the cam g, by a spring, the said cam giving oscillating motion
to the lever which has a hook at its lower end. On the shaft W there is also
centred a lever V one end of which is acted upon by the cam U, so as to oscillate
the lever whose other end projects out beneath the shaft b and is provided with an
extension or arm X carrying a small roller X'. The arm X is guided by a slightly
bent fork Y, fig. 1, and is acted upon by a spring Z, fig. 10, from behind.
A thread guide D, with slot D and hook D' is placed to the left of the lever V,
and connected by the link B, to the bell crank lever E, centred on a stud E¹ and
receiving oscillating motion from the cam U, a roller E³ centred in the upper arm
of the lever bearing on the cam, as seen at figs. 4, 5, and 10 and being kept in
contact therewith by the spring F. The movement of the thread guide is caused
by the part U1 (fig. 5) of the cam U. Further to the left than the thread guide D,
there is situated a bracket G, which has an eye in it which serves as a guide for the
under thread 1, the latter being wound on a bobbin H, and carried under the guide
roller H. From the guide the thread passes through the slot D¹ of the guide D,
to the small roller X' in the arm X, and thence passes upwards through an opening
at the front part of the arm X.
The working of the machine is as follows:-The material to be sewn is placed
on the table i, under the presser K in the usual manner. The awl d, fixed in the
head & pierces the material on the revolution of the machine, while at the same
time the shaft b, with the awl and the material is by the lever p shifted to the left
a distance equal to the length of one stitch the presser K at the same moment
being slightly raised by the action of the cam n on the roller o. The open hole in
the material is by this movement fed directly under the hook needle c¹, carried
in the head c, which needle passes through the hole after which the thread
lever V X moves upwards, and the thread guide D, backwards causing the
hook D³ to place the thread 1, across a slot made in the upper end of the arm X.
The arm X having now approached the needle hook it makes a motion from left to
right, being at the same time pushed slightly inwards by means of the fixed fork Y,
which motion causes the thread to be delivered to the needle hook. The needle
then moves upwards drawing a loop through the material, as at fig. 3, while at
the same time the thread guide D, moves forward and disengages the thread. At
the moment whilst the thread loop is being drawn out to its full length it is
widened by the action of the oscillating hook h in order that the point of the
shuttle in moving to the right may pass freely through the loop. At the same
time the needle hook moves slightly forward which has the effect of disengaging
the loop from the needle, the thread being held by the book h, fig. 6, so preventing
the loop from following the shuttle to the right. When the shuttle has passed
through the loop the thread lever VX in descending draws the loop together, see
figs. 1, 4 and 8. After the shuttle has passed through the loop and whilst the latter
is being closed the shaft b with the awl again moves to the right to form a new
hole after which it again moves to the left feeding the new hole under the needle
and another stitch is completed as before described.

page_text: Figure 8, shows on an enlarged scale the manner of making the stitch, in which
is specially indicated the upper thread 2 coming from the shuttle, and the loop
formed from the under thread 1.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me, I declare that what I claim is :-
1. The general arrangement and combination of parts constituting the machine
for sewing boot soles substantially as hereinbefore described with reference to the
accompanying drawings.
2. In a machine of the class referred to the combination of the shaft b, needle
holder cawl holder d, levers e, f and p and cams g, n, arranged and operating
substantially as described with reference to the appended drawings.
3. In a machine of the class referred to the shuttle S, carried in a lever ŕ and
operated by a lever t, through an arc in a plane transverse to the motion of the
needle in combination with the hook lever h, also working through an arc in a
plane transverse to the motion of the needle and in a direction opposite to the
motion of the shuttle substantially as described with reference to the annexed
drawings.
4. The presser K, K¹, K' in combination with the lever 1, spring m, and lever o,
operating substantially as set forth with reference to the accompanying drawings.
5. The hook h, in combination with the spring q, and cam g, substantially as
and for the purpose set forth with reference to the annexed drawings.
6. The combination consisting of the thread lever V, X, fork Y and spring Z,
operating substantially as described with reference to the appended drawings.
7. The thread guide D, D¹, D' operated substantially as described with reference
to the accompanying drawings.