Year: 1886

page_text: Date of Application, 21st Oct. 1886.
Complete Left, 14th Dec., 1886..
Complete Accepted, 15th Feb., 1887,
Alternately in Reverse. Directions.
1, THOMAS WILLIAMS, of Bute East Moors, Cardiff, in the county of Glamorgan,
Patent Fire Brick manufacturer, do hereby declare the nature of this invention to be
as follows:-
This invention consists in improvements in mechanism for effecting rotary motion
of a shaft or spindle in such manner that after having rotated to a required extent in
one direction, the said shaft or spindle shall turn in the reverse direction, and hence a
kind of reciprocating motion in a rotary sense is imparted to the shaft or spindle and
to any device or devices carried thereby.
According to this invention the spindle or shaft which it is required to rotate in the
manner above indicated is supported in suitable bearings and is furnished with as well
or enlarged part in which is cut or otherwise produced a groove which extends spirally
around it. The groove may, instead of being made in a swell or enlarged part of the
spindle or shaft, be made in the latter and the swell or enlarged part may be dispensed
with.
Carried in guides placed parallel to the axis of the shaft or spindle is a shed or block
to which reciprocating motion, in a plane parallel to the axis of the shaft, is imparted
by means of a connecting rod connected thereto and to a crank, piston rod or other
medium for imparting reciprocating motion. The shed or block or the pin attached
thereto, takes into the spiral groove aforesaid and, as the shed or block is moved
backwards and forwards in the guides, it causes the shaft or spindle to rotate
accordingly. An antifriction roller may be fitted to that end of the shed block or pin
which takes into the groove.
This method of and means for effecting rotary motion alternately in reverse directions
is applicable, among other purposes, to certain classes of sewing machines wherein a
hook or hooks employed to engage with the loops of the thread at the needle may, by the
adoption of the improved mechanism in which this invention consists be presented
and withdrawn with increased precision and regularity, as, by a system of cranks in
connection therewith, the occurrence of dead points is avoided.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: Alternately in Reverse Directions.
I, THOMAS WILLIAMS, of Bute East Moors, Cardiff, in the county of Glamorgan,
Patent Fire Brick manufacturer, 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 consists in an arrangement of mechanism for obtaining rotary motion
of a shaft or spindle alternately in reversed directions and, consequently, of any device
or devices which may be attached to such shaft or spindle.
The spindle or shaft to which such motion is to be imparted is supported in suitable
bearings and, under one arrangement, is furnished with a swell or enlarged part in
which is cut or otherwise produced a groove which extends spirally around it. This
grooved part of the spindle or shaft constitutes a cam.
Carried in a guide or guides placed parallel with the shaft or spindle is a block to
which reciprocating motion, in a plane parallel with the shaft or spindle, is imparted
by means of a connecting rod attached at one end thereto and at the other end to a
crank, piston rod, rocking shaft or other reciprocating medium. Connected to the
block aforesaid is a pin or button which extends into it and fits the groove of the cam
and as, in the reciprocating motion of the block, the pin or button is actuated to move
correspondingly therewith, the cam is rotated accordingly. That is to say, that while
the block is being driven from one end of its travel to the other the cam and spindle
continue to rotate in one direction accordingly, and, on the return stroke of the block,
the cam and spindle are caused to turn in the reverse direction.
Under another arrangement the spiral groove may be formed in the shaft instead of
in an enlarged part thereof.
The means of obtaining rotary motion alternately in reverse directions in which this
invention consists are applicable to various purposes. Among others, they are
applicable to the actuation of the hook or hooks which in certain kinds of
sewing machines are employed to engage with the loops of the thread at the needle
as, by the adoption of the mechanism in which this invention consists, the hook
or hooks is or are presented and withdrawn with increased precision and regularity,
the occurence of dead points in the driving parts being obviated.
Referring to the accompanying sheet of illustrative drawings, Fig. 1 represents a
side elevation and Fig. 2 a plan of an arrangement of mechanism designed in accord-
ance with this invention for the partial rotation alternately in reversed directions of a
shaft or spindle a.
The shaft or spindle a, carried in bearings A springing from the plate A, is furnished
with an enlarged part in which is cut or otherwise produced the spiral groove bl
which extends throughout the enlarged part or cam b. Into this groove b¹ fits a
button or pine which at the outer end is connected to the block d carried between
the guide bars e in which it is free to reciprocate in a plane parallel with the shaft or

page_text: spindle a and the cam b. Beyond the ends of the cam the groove may be variously
shaped according to any special requirement. Instead of the button or pin c an anti-
friction roller may be used. By the connecting rod g the slide block d is coupled to
the crank attached to the shaft by which it is moved backwards and forwards. It
is evident that as the block d is caused to travel from one end of the cam to the other,
the pin or button c acting against one side of the groove b¹ causes the cam to rotate,
and whilst the direction of the motion of the block & remains unchanged, the cam b and
spindle a continue to rotate in one direction accordingly. When, by the action of
the crank h, the motion of the block d is reversed the direction of rotation of the cam &
is also reversed. Thus the spindle a, and any device or devices attached thereto,
partially rotated alternately in reverse directions whilst the reciprocating motion of
the block d is maintained.
Among other purposes to which the mechanism in which this invention consists is
applicable, is the regulation of the oscillation or rotation alternately in reverse
directions of the hook or hooks which in some kinds of sewing machines is or are
employed for engagement with the loops of the thread at the needle, and which hook
hooks
or may, by the adoption of the said mechanism, be presented and withdrawn
with increased precision and regularity, the occurence of dead points in the driving
parts being obviated.
Having now particularly described and ascertained the nature of this invention and
in what manner the same is to be performed, I declare that what I claim is :-
1. The use, for effecting rotary motion alternately in reverse directions, of a spirally
grooved cam such as 6 (or a spirally grooved spindle) to which rotary motion is imparted
through the medium of a pin or button such as c, or the equivalent thereof, fitting into
the spiral groove and connected to a block to which reciprocating motion is imparted
from a crank, piston rod or other medium for imparting such motion, substantially as
hereinbefore described.
2. The combination, for effecting rotary motion alternately in reverse directions, of
a spirally grooved cam such as b (or a spirally grooved spindle) a pin or button such
as c, or the equivalent thereof, fitting into the spiral groove of the cam or spindle, and
connected to a block such as d having reciprocating motion in guides such as e, with
means for actuating the block and cam whereby the occurence of dead points in the
driving parts is avoided, substantially as hereinbefore described.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.