Year: 1886

page_text: I, WALTER BEECROFT of Swinegate, Leeds in the County of York, Engineer 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:-
My improvements have reference to Rotary hook and other sewing machines,
whereby such sewing machines are rendered inore silent whilst in operation, and
parts of such machines are simplified.
In order that my invention may be completely understood reference is given to
the accompanying sheets of drawings.
Fig. 1, is a part side elevation and section.
Fig. 2, an.end elevation, Fig. 3.detail view of part. of machine.
The Sewing machine head is shewn at a, and mounted on an ordinary bed
plate b.
I mount in centres c or other supports in the head a of the sewing machine, an
oscillating barrel d through which a round connecting rod e passes and has its
bearings therein for transmitting motion to the hook shaft f under the sewing
machine table g.
The above arrangement of oscillating barrel d dispenses with the use of gearing
and consequently the machine works much more silently and steadier than
heretofore.
The necessary intermittent rest and motion is given to the rotary hook h from
needle shaft i through crank j and connecting rod e which engages by means of a
sliding stud k in a curved groove or slot in the crank or disc 7 on the end of the
rotary book shaft f.
The feed bar m which carries the presser foot n is mounted in an oscillating
barrel o, the lift motion being imparted to such bar by an arm p, actuated by a
cam g on the needle shaft i, the feed motion is imparted to the feed bar m by a
double lever r, one end of which is engaged with the cam or tappet s on needle
shaft i, and the other end provided with an adjusting or regulating screw t is in
contact with the oscillating barrel o imparting the required movement thereto.
The amount of oscillation can be regulated by adjusting the set screw t.
I employ a positive motion to the lever v mounted in centres u, used for taking
up the slack thread, such lever being operated by a cam won the needle shaft i.

page_text: In order to impart an increase of tension to the top thread when required, I
mount a cam or eccentric x on the needle shaft which acts upon a piston y
working in bearings z upon the head of the machine. In this arrangement the
thread passes between two plates 1. 1. and at intervals the piston y rises and
presses the plates 1. 1. together with the thread between them, thereby impeding
the progress of such thread and increasing the tension thereon.
Instead of the top feed motion herein before mentioned, what is known as an
ordinary bottom feed motion may be employed in combination with my
improvements.
I employ a moveable arm 2. mounted on a stud 3 and on it is provided a
spring 4 which when in position shewn in drawing, retains the spool within the
shuttle, and when moved into position shewn in dotted lines, the spool can be
removed.
Other parts of the machine not herein described may be of ordinary construction.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
.
1. The arrangement of crank or disc with curved groove or slot k¹ in which
the sliding stud k operates, for imparting the intermittent rest and motion to the
rotary hook.
2. The arrangement and application of. oscillating barrel o, substantially as and
for the purposes herein set forth.
3. The arrangement and combination of oscillating barrel o, double lever r, cam
or tappet s, as a means for imparting the required feed, also the means employed
for imparting the required lift movement to the presser foot, substantially as herein
set forth.
4. The application of positive motion to the lever for taking up the slack
thread, such lever, mounted in centres, being operated upon by a cam won needle
shaft i; substantially as herein set forth;
5. The arrangement of cam or eccentric x, in combination with the piston y for
pressing the plates 1. 1. close together, thus intermittently impeding the progress
of the thread, substantially as and for the purposes herein set forth.
6. The application of moveable arm 2 and spring 4 for retaining the spool in
position whilst the machine is in operation.
7. The arrangement and combination of crank j on needle shaft i, connecting
rod e, oscillating barrel d, sliding stud k, crank or disc having curved groove k¹
on which the sliding stud k operates for imparting the required intermittent rotary
motion and rest to the rotary hook h, substantially as and for the purposes herein
set forth,