Improved Means for Securing Gear Wheels on Shafts in Sole-sewing and other Machines.
Year: 1896

page_text: Date of Application, 9th June, 1896
Complete Specification Left, 9th Mar., 1897-Accepted, 5th June, 1897
PROVISIONAL SPECIFICATION.
Improved Means for Securing Gear Wheels on Shafts in Sole-sewing
and other Machines.
I, FREDERICK WILLIAM FARR, of 16 Mentmore Terrace, London Fields,
London, in the County of Middlesex, Boot and Shoe Manufacturer, do hereby
declare the nature of this invention to be as follows:-
This invention relates to improvements in sewing machines, as for instance such
as are employed in the manufacture of boots and shoes, but it is also applicable to
other machines for similar purposes. Its object is to provide readily adjusted and
automatic controlling mechanism,-located in any convenient part of the means
employed for driving the whirl, looper, or shuttle (all of which, I wish it to be
understood, are hereafter included in the term whirl),-which is certain and reliable
in its action and which will immediately stop the rotation of the whirl whenever a
tack or other obstruction comes in contact with the same.
According to this invention on the underside of one of the whirl driving gear
wheels-which wheel is mounted loosely on its shaft-or to a suitably shaped plate
or dise fixed to or forming part of the wheel, or to the hub of the wheel, is formed
or fixed a rigid projection or stop, and at a suitable distance therefrom is also a
second stop or projection arranged in any suitable manner so as to be capable of
being compressed level with the underside of the said wheel or plate or hub of the
wheel. On the said shaft is also mounted and adjustably fixed at suitable distances
apart one or more bosses (with or without slotted portions) of any suitable shape or
configuration and length. Through the boss or bosses alone, or bosses and collars
or guides, may be passed in any convenient manner a piece of metal, wood, clay
piping, or any other material which is brittle, and which is weaker than the strain
caused by the obstruction, so that it shall be the weakest and breaking point of the
machine. The piece of metal or other material may be of any convenient shape or
contour, and may be either in the form of a strip or screed, or in short lengths or
pegs capable of being fed into position either by hand, or by adjustable mechanism,
such as for instance say by any suitable arrangement of lever or levers and pawl
or pawls actuated from any convenient moving part of the machine, or a cam on the
hub of the wheel, or by one or more weights or springs; or when the pieces of
metal or other material are in the form of pegs or pins they may be automatically
fed into position by hand, or adjustable mechanism or automatically by means of a
chute in a similar manner to that employed on self-feeding eyeletting machines.
In the latter case the pegs or pins may run down the chute; the bottom pin or peg
being retained in the chute say by a spring capable of being automatically moved
out of position by a lever, wheel or its equivalent actuated from some moving part
of the machine, thus permitting the pegs to fall into position for feeding purposes.
In order to facilitate the breaking of the strip of metal or other material it may
have grooves or indents of the same or varying depths on one or more sides, say
opposite each other, and when a pawl and lever arrangement is employed, the strip
or screed of metal or other material may also have teeth formed in it in which the
feeding pawl works.
The strip of metal or other material is fed so as to project a suitable distance
above or beyond the boss or guide nearest to the hub of the loose wheel. As the

page_text: shaft rotates the projecting portion of the strip or screed is arranged to compress
one of the stops to allow it to pass over it, until the screed or strip comes in contact
with the rigidly fixed stop when it (the strip or screed) acts as a driving pin. In
the meantime the compressed stop returns to its normal position for preventing any
backlash of the shaft or loose wheel. When a tack or other obstruction becomes
engaged, say, with the whirl-the projecting piece of the strip or screed being only
of sufficient strength to drive the whirl for sewing purposes when free from
obstruction-it will, by the shear like action of the fixed stop, immediately
cause the projecting part of the strip or screed to be broken off thus permitting
the shaft to revolve freely whilst the driving gear and whirl remain stationary.
The herein described improved mode of driving the gear thus provides in one or
more parts between the main driving shaft and the whirl-whether it has a rotary
or reciprocating motion-a weak point or points of contact so that said weak points
will break always first should any obstruction occur in the whirl or other part of
said gearing or shafts.
Dated this Eight day of June 1896.
FREDERICK WILLIAM FARR.
COMPLETE SPECIFICATION.
Improved Means for Securing Gear Wheels on Shafts in Sole-sewing
and other Machinos.
J, FREDERICK WILLIAM FARR, of 16 Mentmore Terrace, London Fields,
London, in the County of Middlesex, Boot and Shoe 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 relates to improvements in gear wheels that may be used for
instance in sewing machines, as for instance such as are employed in the manu-
facture cf boots and shoes, but it is also applicable to other machines. Its object.
is to provide readily adjusted and automatic controlling mechanism,-located in any
convenient part of the ineans employed for driving the whirl, looper, or shuttle (all
of which, I wish it to be understood, are hereafter included in the term whirl),
which is certain and reliable in its action and which will immediately stop the
rotation of the whirl whenever a tack or other obstruction comes in contact with
the same.
In the drawings hereunto annexed I have shown by way of illustration only, my
invention as applied to a sole sewing machine, but I would distinctly have it
understood it may be adapted equally as well to other machines, such as for instance
say to drilling machines, tapping machines, where say spring clutch mechanism is
sometimes employed; and the like.
Fig. 1 is a side elevation of a sewing machine of what is known as the "Blake"
type, with my invention applied.
Figs. 2 and 3 are elevations drawn at different angles to each other of enlarged
views of the invention as applied to one of the gear shafts of the machine.
Figs. 4, 5, and 6 are details of same.
Fig. 7 is an elevation showing the invention used with a smooth piece of wire.
A is the framework of the machine, B the horn for supporting the work to be
sewn, C a portion of the sewing mechanism, D the shafts upon which the whirl
driving gear E is mounted.
All the above parts are of ordinary construction, and are operated in the ordinary
manner.

page_text: . According to this invention on the underside of one of the whirl driving gear
wheels E mounted, say, upon the shaft D running in an angular direction-said.
wheel being mounted loosely on its shaft is a suitably shaped plate ondise F fixed
to or forming part of the wheel, or to the hub of the wheel, on which is formed or
fixed a rigid projection or stop H, and at a suitable distance therefrom is also a
second stop or projection I arranged in any suitable manner so as to be capable of
being compressed level with the underside of the said wheel or plate or hub of the
wheel. On the said shaft is also mounted and adjustably fixed at suitable distances.
apart one or more bosses J (with or without slotted portions) of any suitable. shape
or configuration and length. Through the boss or bosses J alone, or bosses and
collars or guides, may be passed in any convenient manner a piece K of metal,
wood, clay piping, or any other material which is brittle, and which is weaker than
the strain caused by the obstruction, so that it shall be the weakest and breaking
point of the machine. The piece K of metal or other material may be of any
convenient shape or contour, and may be either in the form of a strip or screed, or
in short lengths or pegs capable of being fed into position either by hand, or by
adjusting mechanism, or by one or more weights or springs; or when the pieces of
metal or other material are in the form of pegs or pins they may be automatically
fed into position by hand, or adjustable mechanism or automatically by means of a
chute and feeding mechanism say of the same construction and acting in a similar
manner to that employed on self-feeding eyeletting machines. In the latter case
the pegs or pins may run down the chute; the bottom pin or peg being retained in
the chute say by a spring capable of being automatically moved out of position by
a lever, wheel or its equivalent actuated from some moving part of the machine,.
thus permitting the pegs to fall into position for feeding purposes.
In order to facilitate the breaking of the strip of metal or other material it may
have grooves or indents k of the same or varying depths on one or more of its sides,
say opposite each other. For feeding the screed or strip K to its work a pawl L
is employed which is mounted on a lever M, sliding in boss J so as to be capable
of being actuated by cam lever N pivoted to boss J as shown.
The free ends of the lever N engage respectively with stop H' and pin O fixed
to lever M and working in a slot in boss J. A spring P is employed for keeping
the pin O and upper end of lever N in contact with each other. The pawl L may
engage with the indents k of the strip or screed of metal or other material, or the
strip or screed K may also have teeth formed in it in addition to said indents with
which the feeding pawl engages for feeding purposes.
The strip K of metal or other material is fed so as to project a suitable distance
above or beyond the boss or guide nearest to the hub of the loose wheel. As the
shaft D rotates, the projecting portion of the strip or screed K is arranged to
compress the stop I to allow it to pass over it, until the screed or strip K comes in
contact with the rigidly fixed stop H when it (the strip or screed K) acts as a.
driving pin.
In the meantime the compressed stop returns to its normal position for preventing.
any backlash of the shaft or loose wheel.
At Fig. 7 K is an ordinary piece of. smooth steel wire which passes through the
flanges of the bosses J J which are attached to the shaft D by the set screws jj, in
order that the wire can readily be adjusted as to its length between the underside
of the lower boss J and the upper face of the disc F for regulating the breaking
portion of the wire. The wire K is held in position by the thumb screw j..
A hole is formed in the top of the disc F into which the lower end of the wire
can easily pass to form the connection between the boss J and disc F.
When a tack or other obstruction becomes engaged, say, with the whirl or
gearing the projecting piece of the wire K, between the disc F and lower
boss J, being only of sufficient strength to drive the whirl for sewing purposes when
free from obstruction it will, by the shear like action of the fixed stop, immediately
cause the projecting part of the wire to be broken off, thus permitting the shaft D.
to revolve freely whilst the driving gear E and whirl remain stationary.

page_text: If desired, instead of the wire K being in screed form it may assume the form of
an endless band of wire, thread, or the like passed over pins fixed respectively in
the peripheries of the disc F and flange J.
The herein described improved mode of driving the gear provides in one or more
parts or points between the main driving shaft and the whirl-whether it has a
rotary or reciprocating motion-a weak point or points of contact so that said weak
points will be sure of always breaking the first should any obstruction occur in the
whirl or other part of said gearing or shafts.
Having now particularly described and ascertained the nature of my inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In sécuring gear wheels on shafts of machinery, the means for providing a
breaking point whenever any obstruction enters the machine as set forth, said
breaking point consisting essentially of a metal or other strip K passed through
bosses JJ, so as to project beyond the face of the lower boss and engage with and
between a fixed stop H and depressible stop I fixed to one of the whirl driving
gear wheels E. for ordinary driving purposes, and to be shorn off when any
obstruction enters the machine, said strip being fed by pawl I, adjustable lever M,
pin O, actuating lever N and stop H' mounted in the plate or disc F, all combined
and operating as set forth.
2. In securing gear wheels on shafts of machinery the combination of the shaft D
having adjustable bosses J mounted therein through which an adjustable wire K is
passed to a hole f in a disc F also mounted on said shaft as and for the purposes
herein set forth.
Dated this Ninth day of March 1897.
FREDERICK WILLIAM FARR.