Improvements in Driving Attachments for Sewing Machines and the like.
Year: 1892

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by THE SINGER MANUFACTURING COMPANY, of
New York, in the United States of America, Sewing Machine Manufacturers.]
Improvements in Driving Attachments for Sewing Machines and
the like.
I, ALEXANDER ANDERSON, Manager of The Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of this invention
and in what manner the same is to be performed, as communicated to me to be
particularly described and ascertained in and by the following statement :--
My invention has for its object to provide a convenient mechanism by which
power may be transmitted from a constantly running pulley to a driven pulley from
which sewing or other similar small machines may be operated. My improved
driving device or "under driver" is intended to be applied beneath a bench or work
table on which the machine to be driven is placed, and it is provided with a suitable
trendle-operated mechanism by which the constantly running pulley may be forced
into frictional contact with the pulley to be driven. The driven pulley is preferably
mounted on a sleeve in which is inserted an oil conducting wick extending into an
oil cup, the said sleeve being provided with perforations through which the oil can
escape to lubricate the bearing of the said driven pulley, and the latter is also
provided with a perforated sleeve, on which is mounted the constantly running
driving pulley and through which the oil can escape to lubricate the bearing of
the latter.
The perforated sleeve supporting the driven pulley is secured to a suitable
bracket attached to the under side of the table, and to the said bracket is pivoted
a three-armed lever one arm of which may be impinged against the hub of the
driving pulley to force the latter into frictional contact with the driven pulley, and
another arm of which is provided with a brake which will impinge against the
driven pulley to arrest the movement of the same when the first named arm is
released from the driving pulley, all as will hereinafter be more fully explained.
In the accompanying drawings
Figs. 1 and 2 are opposite side elevations of my improved attachment.
Figs. 3 and 4 are opposite end views thereof.
Fig. 5 is a vertical section.
i Fig. 6 is a detail view of the brake.
Figs. 7 and 8 are end and side views, respectively, of the sleeve which supports
the driven pulley.
A denotes a suitable metal bracket which is to be attached to the under side of
the table A on which the machine to be driven is mounted.
Secured to a depending arm a of the bracket A is a sleeve B having a rounded
or conical inner end b.
The said sleeve B is provided with a series of radial perforations 6, and its
rounded inner end b is also provided with perforations b³, preferably four in number,
as shown in the detail view Fig. 7 which leave the central portion of said end
intact. Through the perforations b³, boil is admitted to the bearing by means of
a suitable oil conducting wick c the end of which extends into an oil cup C
supported by the said sleeve B. On the sleeve B is mounted the driven pulley D,
the inner face of which is grooved to receive a friction ring d of leather or other
suitable material, and the said driven pulley is also provided with a sleeve d
mounted on the said sleeve B and having one or more oil holes d'. A plug ☞having
a flat inner face is screwed into the end of the said sleeve d' of the pulley D, the
said flat inner end of said plug being, when the said pulley is to be driven, forced
into contact with the rounded inner end of the sleeve B. On the sleeve d' of the
...61

page_text: said driven pulley is mounted the driving cone-pulley E which is provided with a
sleeve e having at its outer end a plug e. From the construction above described
it will be apparent that the bearing of the driven pulley on the sleeve B, and the
bearing of the driving pulley on the sleeve d' will be properly lubricated from the
oil cup so that the said pulleys will always run smoothly and easily.
Pivoted at f to a depending lug a' of the bracket A is a three-armed lever F,
the lower or vertical arm of which is provided with a rounded projection consisting
preferably of a wooden plug f which is to impinge against the plug e' of the driving
pulley E when said driving pulley is to be forced into frictional contact with the
driven pulley D.
Thus when the said driving and driven pulleys are in frictional contact with
each other so as to run together they will be held between two stationary rounded
parts to wit the rounded wooden plug and the rounded end of the sleeve B
so that the stationary parts between which these two pulleys (which practically
form one pulley when they are running) are held, will cause but little friction
thereon and they will therefore run easily.
The arm of the lever F is provided with an internally threaded sleeve/**
entered by a threaded screw 9, rigid with a hub G, the said hub being provided
with an arm g' and with lugs which are on opposite sides of said arm³, so that
the said lugs by engaging with said arm, serve as stops to limit the turning
movements of the hub G. The inner end of the screw 9 simply impinges against a
lug or projection a³ on the bracket A so that when the said screw is partly turned,
it causes the plug /³, carried by the arm f¹ to impinge against the plug e¹ of the
driving pulley E, and thus forces said driving pulley into contact with the driven
pulley. To the arm g' is connected a rod or pitman 9 which is to be operated by
à suitable treadle, not shown. The lever F is provided with a second arm having
at its end a suitable brake portion f which is to arrest the movement of the driven
pulley D when the driving pulley is released from frictional contact therewith.
This brake consists, as herein shown, of a strip of leather the ends of which
are extended through holes in depending lugs a formed on the bracket A, and to
prevent endwise movement of this strip of leather the brake portion of the
lever F is provided with a tooth or projection f which sinks into the leather strip
and holds it from moving end wise. This leather strip, as a brake, has been
substituted for the ordinary wooden brake surface for the reason that the latter
produced an objectionable squeaking when the driven pulley was stopped, such
squeaking not occuring when the leather strip is used. A spring H which presses
upon the upper side of the arm f serves normally to throw said arm down to apply
the brake to the driven wheel when the driving wheel is released therefrom.
The screw turns in the sleeve f₁ with sufficient friction so that the hub G
will remain in any position to which it may be turned until it is moved from such
position by the operator, and it will not therefore be necessary for the operator
to constantly apply pressure to the treadle to keep the driving pulley in contact
with the driven pulley, as is necessary with some forms of driving attachments
now in use.
In other words, the power may be applied by the operator and will continue
to be applied without any further effort on his or her part until the treadle
shall again be operated to release the driving pulley from the driven pulley.
This friction of the screw g in its sleeve is partly caused by the pressure of
the stiff spring H which forces the brake into contact with the driven pulley.
To prevent the belt which runs from the driven pulley to the machine on the
table from escaping over said pulley, I prefer to provide my improved pulley with
a belt guide J.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, (as communicated to me)
I declare that what I claim is :-
1. In a driving attachment, the combination with suitably-mounted driven and

page_text: driving pulleys, of a lever for forcing said pulleys into frictional contact with
each other, and a screw by which said lever is operated.
2. In a driving attachment, the combination with suitably mounted driven and
driving pulleys, of a three-armed lever one arm of which serves to force said
pulleys into frictional contact with each other, the second arm of which is
provided with a brake to arrest the movement of the driven pulley when the
driving pulley is released therefrom, and the third arm of which is provided.
with a screw to operate said lever.
3. In a driving attachment, the combination with a perforated sleeve, provided
with an oil wick, of an oil cup into which said wick extends, a driven pulley
mounted on said sleeve, and provided in turn with a perforated sleeve, a driving
pulley, mounted on the last named sleeve, and means for forcing said driving
pulley into contact with said driven pulley.
4. In a driving attachment, the combination with suitably mounted driving
and driven pulleys, of a lever by which said pulleys are forced into contact with
each other, said driven pulley being provided with a brake arm having a tooth
or projection, and a strip of leather which serves as a brake surface, and which is
held from sidewise movement by the said brake tooth or projection.
5. In a driving attachment, the combination with suitable mounted driving and
driven pulleys, and a lever for forcing said pulleys into contact with each other,
of a brake for arresting the driven pulley when the driving pulley is released
therefrom, and a belt guide to prevent the belt, running to said driven pulley,
from escaping therefrom.
6. In a driving attachment, the combination with suitably mounted driving and
driven pulleys, of a lover for forcing said pulleys into frictional contact with each
other, a screw for operating said lever; a hub by which said screw is carried
and which is provided with stops to limit its movements in either direction
substantially as set forth.
TL 1
STL-1000