Improvements in Sewing Machines.
Year: 1891

page_text: Date of Application, 10th Nov., 1891
Complete Specification Left, 26th July, 1892-Accepted, 10th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements in Sewing Machines.
We EDWARD KOHLER, Engineer, and FREDERIC GEORGE BATE, Merchant,
both of 307 High Holborn in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:---
This invention relates to that class of lock-stitch sewing machines in which a
rotary loop taker, or, as it is sometimes called, a rotary shuttle, is used as the means
for passing the locking thread through the loop formed by the needle thread, and
the invention consists in an arrangement of driving mechanism whereby the loop
taker is driven alternately at the heel and at a point near the nose of the same,
as and for a purpose now well understood.
The heel of the loop taker is driven by a plate secured to a disc mounted on the
driver shaft in the usual way, but the nose is driven by a wedge piece that is
thrown into action at the proper moment by a cam or other convenient
mechanism.
This wedge piece works in a guide formed on the disc of the driver, and may be
pivotted to a strap which works in the groove of an adjustable fixed cam
surrounding the driver shaft, and forming a bearing for the same.
Or the wedge piece may be provided with a bowle running in contact with an
adjustable face cam, a spring causing the return motion. Or the wedge may be
provided with a pin which works in a cam groove formed inside a ring adjustably
secured to the underside of the table, or other convenient part of the machine.
The wedge piece will rotate with the driver, and at the proper time will be
pushed forward by the cam, so that it will act on the nose, and push the loop taker
forward clear of the heel driver, to allow clearance for the loop thread, as well
understood.
Dated this 10th day of November 1891.
NEWTON & SON,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
We EDWARD KOHLER, Engineer, and FREDERIC GEORGE BATE, Merchant,
both of 307 High Holborn in the County of Middlesex, 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 :-
This invention relates to that class of lock-stitch sewing machines in which a
rotary loop-taker or opener, or, as it is sometimes called, a rotary shuttle, is used
as the means for passing the locking thread through the loop of the needle thread,
and in which the loop-taker is driven alternately by the heel and nose, the object
of this mode of driving being to remove any obstacle that would be a hindrance to
the free run of the loop thread over the loop taker.
The object of this invention is to effect this double driving in a more simple and
efficient manner than heretofore.
And in order that this invention may be clearly understood, a detailed description
will now be given, reference being made to the drawings hereunto annexed, in
which,―
Fig. 1, Sheet I, shews in end elevation so much of a sewing machine as is needed
to illustrate this invention.

page_text: of but same, partly insec
Fig. 3 is a top plan view of the loop taker and. the driving devices.
Fig. 4, Sheet II, is an underneath plan view of the same.
Fig. 5 is a front view of the loop taker and driver, when in the position shewn at
Fig. 4.
Figs. 6 shew an edge view and plan view of the wedge piece, and
Fig. 7 is a front view of the driving strap or ring.
Fig. 8 shews an obvious modification in the mode of actuating the wedge
piece.
In carrying out this invention, the heel of the loop taker is driven in the usual
way, that is to say, by means of a bracket piece extending from a disc carried by
the driver shaft, and extending over the heel.
To drive the nose, a wedge piece is employed, which slides in a tubular guide on
the disc, and is operated at the right moment to enter a notch in rear of the nose
of the loop taker, and cause the loop taker to advance clear of the heel driver, by
means of a cam action, such as a strap working in a fixed inclined cam groove
conveniently situated for the purpose.
A is the loop taker, and A' its bobbin, which is held in the taker by the bobbin
holder A2 in the usual way,-the loop taker working in a race of the usual form.
is the point or nose of the loop-taker, and just in rear of the nose is a recess
which forms a shoulder a¹, by which the loop taker is driven at one part of the
stroke. z is the heel of the loop taker, at which point it is driven at another part
of the stroke.
B is the driver shaft, which is mounted concentrically in a fixed sleeve B¹,
carried by the bracket B2 of the machine.
C is a disc or plate on the end of the shaft B, and it is formed with a forwardly
extending bracket or driving portion C, which strikes against the heel z of the
loop taker, and drives it during one portion of its stroke or rotation.
D is a wedge piece which drives the nose of the loop taker. One form of this
wedge piece is shewn at Fig. 6. The eye portion D' fits into the forked part E¹
of the strap or ring E, Fig. 7, and this wedge piece D slides in a direction at
right angles to the vertical plane of the disc C, in a guide .C² carried by
the disc.
B* is an enlargement of the sleeve B', and contains a diagonal groove in which
the ring E is.secured and works. The rotation of the shaft B in the fixed
sleeve, will, through the wedge piece D with which it is connected by the disc,
cause the ring E to rotate in the groove, and the wedge piece D will thus be
caused to work to and fro in its guide C³.
When the wedge piece D is pushed out, the inclined edge will strike against
the shoulder of the loop taker, and, in addition to driving, advance the hook to
such an extent as to clear the heel z of the heel driver, and thus allow space for
the loop thread to pass freely away. This position is shewn at Fig. 5.
When the wedge is withdrawn, the hook will, so to
heel z comes into contact with the rotating heel driver.
for the passage of the loop thread between the shoulder
This position will be seen in Fig. 1.
speak, drop back until its
Space will thus be allowed
and the wedge driver D.
In the modification Fig. 8, the wedge D is formed at its rear end with a
bowle D2, which runs in contact with the face of a cam B³, fixed on the sleeve B,
or elsewhere, a coiled spring being employed to keep the bowle up to its
work.
It will be evident that other means may be readily devised for working the
wedge D in and out, without departing from this invention; for example, a pin
carried by the wedge may work in the cam groove, in place of the strap, but the
strap arrangement described is preferred, as the groove, in this case, is compietely
filled up by the strap or ring E, and the entrance of dirt is prevented, besides
which, the working is much smoother and surer, as there is nothing to spring,
break, or get out of order.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
:-
In rotary loop-taker or shuttle sewing machines, a driver for the nose of the
shuttle, consisting of a wedge piece carried by a plate or disc on the end of
the driver shaft, and moved in and out of gear by a strap, pin, or bowle (with
which it is connected), working in connection with a fixed cam arranged con-
centrically to the driver shaft, substantially as herein shewn and described.
Dated this 25th day of July 1892.
NEWTON & SON,
Agents for the Applicants.