Improvements in Lock-stitch Sewing Machines.
Year: 1889

page_text: Date of Application, 18th Nov., 1889
Complete Specification Left, 11th July, 1890-Accepted, 16th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in Lock-stitch Sewing Machines.
I, JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this Invention (which has been com-
municated to me from abroad by the Willcox and Gibbs Sewing Machine Company
of New York, United States of America) to be as follows:-
This Invention relates to lock stitch sewing machines in which a rotary hook carries
the loop of the upper thread around the bobbin or carrier containing the spool of the
lower thread and a take up draws up this loop so as to tighten and complete the stitch
before the next loop is taken by the rotary hook; and is more particularly an improve-
ment upon or modification of the machines of this kind wherein the needle bar and
take up are operated from a main shaft in the gooseneck or overhanging stationary
arm, and the rotary hook mounted on a shaft below the work plate, is driven at a
higher speed than the main shaft through gearing at the standard of the gooseneck,
such as are referred to in the Specifications of Patents No. 1583 dated April 12, 1881,
and No. 16768 dated December 21, 1886.
In sewing machines it is of great importance (as pointed out in the said Specifications)
to employ so far as possible uniform rotary motion, and in order to give such a motion
to the rotary hook and at the same time have it carry the loop of the upper thread
over the bobbin of under thread in proper time, for the take up (with or without
the assistance of any co-operating part) to draw in such loop before the next loop
taken by the rotary hook, the latter was given more than one revolution to each
reciprocation of the needle bar, namely, two revolutions in the machine described in
the Specification of the first Patent mentioned above, and three revolutions in the
machine of the second Patent.
This multiple revolution (as the revolution of the rotary hook more than once to
each reciprocation of the needle bar may in general be termed) is necessary because
of the large proportion of its own revolution, which must be occupied by the rotary
hook in carrying the loop of upper thread around the bobbin of under thread, a
proportion which is larger than is occupied in shuttle machines by the passage of a
movable or flying shuttle, whether reciprocatory or rotary, through the loop of the
under thread. The necessity for a multiple revolution of the rotary hook, is further
occasioned by the size of the loop of upper thread which is required to go around the
bobbin of under thread, since the larger the loop the longer should be the time allowed
the take up for drawing it up. The triple revolution of the second above named
Patent is more advantageous than the double revolution as it gives a longer time for
the operation of the take up, so that it may finish its operation before the needle again
enters the work.
As described in the Specifications of the said two Patents, the main shaft in the
gooseneck is driven by a belt running on a pulley on the said shaft and this multiple
revolution of the rotary hook is derived therefrom, through. two intermediate toothed
gears or idlers of comparatively small diameter which engage with each other and of
which the upper one engages with a toothed gear on the main shaft and the lower one
with a toothed pinion on the shaft of the rotary hook.
The use of these two intermediate gears or idlers involves not only the friction and
wear of two bearings and three points of engagement of the teeth but also increased
friction and wear in consequence of the rapidity of the rotation of said intermediate
gears or idlers, due to their comparatively small diameter. It also involves the
awkward arrangement of having the main shaft rotate toward the operator (i.e. the top
of the shaft moves in that direction) in case the rotary hook revolves in the opposite
direction as it preferably should, and as it does in the machine illustrated in the
Specifications of the aforesaid patents.
According to the present improvement a single intermediate toothed wheel or idler

page_text: of comparatively large size is employed to give the multiple revolution to the rotary
hook, such wheel engaging with the gear on the main shaft and also with the pinion
on the shaft of the rotary hook. Its use diminishes the friction and permits the main
shaft to revolve in the same direction as the shaft of the rotary hook.
In the aforesaid patented machines two of the four gears (namely the upper inter-
mediate and the pinion) are made of teeth of noise deadening material like leather,
and the other two gears of metal. According to the present improvement the single
intermediate gear is provided with the teeth of leather or noise deadening material and
the pinion on the shaft for the rotary hook as well as the gear on the main shaft, is
made with metal teeth. By this means not only is the use of one leather toothed gear
avoided, but the gearing is made stronger because the teeth of the weaker material
are used on the largest gear, and it is a general rule with toothed gearing that on the
largest gears the teeth bave straightest sides and consequently the greatest cross section
at their narrowest parts. In the pinion, which is necessarily of quite small diameter
the sides of the teeth must be hollowed out very considerably, in order to accommodate
the engaging teeth, and if made of metal they are better able to stand the necessary
removal of material.
Apart, however, from the character of the material employed, the use of the single
large intermediate gear effects an increase in the minimum cross section of the teeth,
since the larger diameter of the intermediate gear enables the sides of the pinion teeth
to be more nearly straight.
In the improved machine, the take up, needle bar and feed device are operated from
the main shaft, it may be through any appropriate mechanism arranged to operate
them in due sequence with reference to the multiple revolving rotary hook and to
one another, when the main shaft is turned in the same direction as the rotary hook;
but it is specially intended to employ a take up fastened to and revolving with the
main shaft at an uniform speed, a needle bar operated from a crank on the main shaft
through a pitman, and a feed bar operated from an eccentric or eccentrics on the main
shaft through appropriate vertical and horizontal connections at the standard of the
gooseneck and under the work plate respectively.
This form of take up is described in the Specifications of the aforesaid patents, in
connection with the rotary hook having a double or triple revolution. Its use tends to
the establishment of uniform rotary motions throughout the machine; and the multiple
rotation of the rotary hook is of special advantage in connection therewith, since it
carries the loop around the bobbin in due time to allow the said loop to be drawn up
before the next loop is taken. If the rotary hook shaft be revolved in the same
direction as in the arrangements of the aforesaid patents, the take up is adapted to the
new (or reversed) direction of revolution of the main shaft by altering the position of
the thread guides and of the take up pins. In case the lower thread guide is con-
nected with the presser foot and presser bar, so as to be adjusted automatically thereby
and thus regulate the action of the take up in correspondence with the thickness of the
work under the presser foot, as described at length in the Specification of the aforesaid
patent of December 21, 1886, the operating means are altered so as to adjust it in the
opposite direction. To effect this in the most convenient way, a bent or bell crank
lever is employed having a horizontal arm connected by a suitable joint or yielding
connection with the presser bar, and a vertical arm which carries the adjustable thread
guide at its lower end.
The needle bar operated by a crank on the main shaft through a pitman as
described in the Specification of the said Patent, produces the same result whichever
way the shaft is turned, and no alteration of the parts is necessary.
A feed bar operated from an eccentric or eccentrics on the main shaft through
appropriate vertical and horizontal connections is described in the aforesaid patent of
April 12, 1881, and also in the Specification of the aforesaid patent of December 21,
1886.
The feed movement is adapted to the new (or reversed) revolution of the main
shaft by altering the connections, or if two eccentrics be employed, by shifting
their positions on the main shaft, or it may be partly in each of these ways.

page_text: It is preferred to employ an improved form of feed movement with two eccentrics
on the main shaft which impart motion to the feed bar under the work plate through
vertical connecting rods at the standard of the gooseneck and horizontal rock shafts
under the work plate, one of said rock shafts being connected with one of said
connecting rods and with the feed bar so as to impart a rising and falling motion
to the feed surface as the rock shaft is vibrated and the other of said rock shafts
being connected with the other of said connecting rods and with the feed bar in
such a way as to give the requisite horizontal motion to the feed surface as the
last mentioned rock shaft is vibrated. In order that the horizontal motion of the
feed surface may be regulated the last mentioned connecting rod instead of being
jointed directly to the arm of the corresponding rock shaft, is jointed to a lever
and a vibratory arm of such lever imparts motion to the rock shaft through a
link which is jointed to an arm of said rock shaft and has a projection in the path
of said arm and is adjustable to bring said projection nearer to or farther from
the fulcrum of said lever, by means of a hand actuated regulator in the form of a
disc provided with a crank pin fitting in a groove in the said link. By turning
the said regulator the crank pin adjusts the link and sets the projection thereon
farther from or nearer to the axis of vibration of the aforesaid arm and thus regulates
the extent of motion communicated to the rock shaft through the link while at
the same time the crank pin does not interfere with the reciprocation of the link.
The motion imparted to the rock shaft through the link is or may be in one direction
only the return movement being effected by a spring. It will be understood however
that the invention is not restricted to this improved form of feed mechanism as other
forms of such mechanism may be used.
If the direction of revolution of the rotary hook should be changed, that of the
main shaft remaining as in the said former Specifications, it will only be necessary to
adapt the rotary hook to revolve in the opposite direction. This could be done by the
use of known forms of rotary hook.
Morcover, the single idler for imparting multiple rotation from the main shaft in
the gooseneck to the rotary hook shaft under the work plate, has a great advantage
over the two illers in respect to the taking of the loops by the rotary hook from the
needle, which latter being driven by a plain crank mechanism is not delayed at the
bottom of its stroke, as in the shuttle machines using a heart cam, but rises
at once, and during its rise presents the loop to the rapidly advancing hook.
In order that the hook may enter the loop with greater certainty, the said hook
should be so timed relatively to the needle that in one of its multiple revolutions its
point crosses the needle just above the eye where the bend made by the thread
leaving the needle eye and passing up to the work tends to hold the thread out from
the needle. With a hook so timed a very small retardation of the hook's motion will
bring the hook point up to the needle so late that instead of passing above the thread,
it will strike and probably cut the said thread. By the use of the single idler in place
of two idlers, the liability to this retardation is very much diminished, since the wear
on the teeth of the driving gears which manifests itself at once in retardation of the
hook, is so much less with the single idler as very materially to improve the machine
in this respect.
Further, any deformation in the teeth of the gearing for example manifests itself in
retarding the motion of the rotary hook and tends to inake it cross the needle too late
in the ascent of the needle to take the loop. The difference in liability to deformation
between the leather teeth on the large single idler and those on two smaller gears, is
decided and important, particularly in view of the extreme accuracy in the timing of
the rotary hook which has been found to be necessary to the best working of the
machine.
Dated this 18th day of November 1880

page_text: COMPLETE SPECIFICATION.
Improvements in Lock-stitch Sewing Machines.
I, JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman, do hereby declare the nature of this Invention which has been com-
municated to me from abroad by The Willcox and Gibbs Sewing Machine Company
of New York, United States of America 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 lock stitch sewing machines in which a rotary hook
carries the loop of the upper thread around the bobbin or case containing the
spool of the lower thread and a take up draws up this loop so as to tighten and
complete the stitch before the next loop is taken by the rotary hook, and is more
particularly an improvement upon or modification of the machines of this kind
wherein the needle bar and take up are operated from a main shaft in the goose-
neck or overhanging stationary arm, and the rotary hook mounted on a shaft
below the work plate is driven at a higher speed than the main shaft through
gearing at the standard of the gooseneck, such as are referred to in the Specifications
of Patents No. 1583 dated April 12th, 1881 and No. 16768 dated December 21st, 1886.
In sewing machines it is of great importance, (as pointed out in the said
Specifications) to employ so far as possible uniform rotary motion and in order to
give such a motion to the rotary book and at the same time have it carry the loop of
the
upper thread over the bobbin of under thread in proper time for the take up (with
or without the assistance of any co-operating part) to draw in such loop before the
next loop is taken by the rotary hook, the latter was given more than one revolution
to each reciprocation of the needle bar, namely, two revolutions in the machine
described in the Specification of the first herein before mentioned Patent and three
revolutions in the machine of the second Patent mentioned.
This multiple revolution (as the revolution of the rotary hook more than once to
each reciprocation of the needle bar may in general be termed) is necessary because
of the large proportion of its own revolution, which must be occupied by the rotary
hook in carrying the loop of the upper thread around the bobbin of the under thread,
a proportion which is larger than is occupied in shuttle machines by the passage of a
movable or flying shuttle, whether reciprocatory or rotary, through the loop of the
under thread. The necessity for a multiple revolution of the rotary hook, is further
occasioned by the size of the loop of upper thread which is required to go around the
bobbin of under thread, since the larger the loop the longer should be the time allowed
the take up for drawing it up. The triple revolution of the hook as described in the
Specification of the second above named Patent is more advantageous than the double
revolution as it gives a longer time for the operation of the take up, so that it may
finish its operation before the needle again enters the work.
As described in the Specifications of the said two Patents, the main shaft in the
gooseneck is driven by a belt running on a pulley on the said shaft and this
multiple revolution of the rotary hook is derived therefrom through two inter-
mediate toothed gears or idlers of comparatively small diameter, which engage with
each other and of which the upper one engages with a toothed gear on the main
shaft and the lower one with a toothed pinion on the shaft of the rotary hook.
The use of these two intermediate gears or idlers involves not only the friction and
wear of two bearings and three points of engagement of the teeth but also increased
friction and wear in consequence of the rapidity of the rotation of the said inter-
mediate gears or idlers, due to their comparatively small diameter. It also involves
the awkward arrangement of having the main shaft rotate toward the operator
(ie. the top of the shaft moves in that direction) in case the rotary hook revolves
in the opposite direction as it preferably should, and as it does in the machine
illustrated in the Specifications of the aforesaid Patents.
According to the present improvement a single intermediate toothed wheel or.idler

page_text: of comparatively large size is employed to give the multiple revolution to the rotary
hook, such wheel engaging with the gear on the main shaft and also with the pinion
on the shaft of the rotary hook. Its uso diminishes the friction and permits the main
shaft to revolve in the same direction as the shaft of the rotary hook.
In the aforesaid patented machines the teeth of two of the four gears (namely the
upper intermediate and the pinion) are made of noise deadening material like leather,
and the other two gears of metal. According to the present improvement the single
intermediate gear is provided with the teeth of leather or noise deadening material
and the pinion on the shaft for the rotary hook as well as the gear on the main shaft,
is made with metal teeth. By this means not only is the use of one leather toothed
gear avoided, but the gearing is made stronger because the teeth of the weaker
material are used on the largest gear, and it is a general rule with toothed gearing
that on the largest, gears the teeth have straightest sides and consequently the greatest
cross section at their narrowest parts. In the pinion, which is necessarily of quite
small diameter the sides of the teeth must be hollowed out very considerably, in order
to accommodate the engaging teeth, and if made of metal they are better able to stand
the necessary removal of material.
Apart, however, from the character of the material employed, the use of the single
large intermediate gear effects an increase in the minimum cross section of the teeth,
since the larger diameter of the intermediate gear enables the sides of the pinion teeth
to be more nearly straight.
In the improved machine, the take up, needle bar, and feed device, are operated
from the main shaft, it may be through any appropriate mechanism arranged to
operate them in due sequence with reference to the multiple revolving rotary hook and
to one another, when the shaft is turned in the same direction as the rotary hook, but
it is specially intended to employ a take up fastened to and revolving with the main
shaft at an uniform speed, a needle bar operated from a crank on the main shaft
through a pitman, and a feed bar operated from an eccentric or eccentrics on the main
shaft through appropriate vertical and horizontal connections at the standard of the
gooseneck and under the work plate respectively.
This form of take up is described in the Specifications of the aforesaid patents, in
connection with the rotary hook having a double or triple revolution. Its use tends
to the establishment of uniform rotary motions throughout the machine; and the
multiple rotation of the rotary hook is of special advantage in connection therewith,
since it carries the loop around the bobbin in due time to allow the said loop to be
drawn up before the next loop is taken. If the rotary hook shaft be revolved in the
same direction as in the arrangements of the aforesaid Patents, the take up is adapted
to the new (or reversed) direction of revolution of the main shaft by altering the
position of the thread guides and of the take up pins.
In case the lower thread guide is connected with the presser foot and presser bar,
so as to be adjusted automatically thereby and thus regulate the action of the take up
in correspondence with the thickness of the work under the presser foot, as described
at length in the Specification of the aforesaid Patent of December 21, 1886, the
operating means are altered so as to adjust it in the opposite direction. To effect this
in the most convenient way, a bent or bell crank lever is employed having a horizontal
arm connected by a suitable joint or yielding connection with the presser bar, and a
vertical arm which carries the adjustable thread guide at its lower end.
The needle bar operated by a crank on the main shaft through a pitman as described
in the Specification of the said Patent, produces the same result whichever way the
shaft is turned, and no alteration of the parts is necessary.
A feed bar operated from an eccentric or eccentrics on the main shaft through
appropriate vertical and horizontal connections is described in the Specification to the
aforesaid Patent of April 12, 1881, and also in the Specification of the aforesaid
Patent of December 21st 1886.
The feed movement is adapted to the new (or reversed) revolution of the main shaft
by altering the connections, or if two eccentrics be employed, by shifting their positions
on the main shaft, or it may be partly in each of these ways.

page_text: It is preferred to employ an improved form of feed movement with two eccentrics
on the main shaft which impart motion to the feed bar under the work plate through
vertical connecting rods at the standard of the gooseneck and horizontal rock shafts
under the work plate one of the said rock shafts being connected with one of the said
connecting rods and with the feed bar so as to impart a rising and falling motion to
the feed surface as the rock shaft is vibrated and the other of the said rock shafts
heing connected with the other of the said connecting rods and with the feed bar in
such a way as to give the requisite horizontal motion to the feed surface as the last
mentioned rock shaft is vibrated. In order that the horizontal motion of the feed
surface may be regulated the last mentioned connecting rod instead of being jointed
directly to the arm of the corresponding rock shaft is jointed to a lever and a vibratory
arm of such lever imparts motion to the rock shaft through a link which is jointed to
an arm of the said rock shaft and has a projection in the path of the said arm of the
lever and is adjustable to bring the said projection nearer to or farther from the
fulcrum of the said lever by means of a hand actuated regulator in the form of a
disk provided with a crank pin fitting in a groove in the said link. By turning the
said regulator the crank pin adjusts the link and sets the projection thereon farther
from or nearer to the axis of vibration of the aforesaid arm and thus regulates the
extent of motion communicated to the rock shaft through the link while at the saine
time the crank pin does not interfere with the reciprocation of the link. The motion
imparted to the rock shaft through the link is or may be in one direction only the
return movement being effected by a spring. It will be understood however that the
invention is not restricted to this improved form of feed mechanism as other forms of
such mechanism may be used.
If the direction of revolution of the rotary hook should be changed that of the main
shaft remaining as in the said former specifications it will only be necessary to adapt
the rotary hook to revolve in the opposite direction. This could be done by the use
of known forms of rotary hook.
Moreover the single idler for imparting multiple rotation from the main shaft in
the gooseneck to the rotary hook shaft under the work plate has a great advantage
over the two idlers in respect to the taking of the loops by the rotary hook from the
needle which latter being driven by a plain crank mechanism is not delayed at the
bottom of its stroke as in the shuttle machines using a heart cam but rises at once
and during its rise presents the loop to the rapidly advancing hook.
In order that the hock may enter the loop with greater certainty the said hook
should be so timed relatively to the needle that in one of its multiple revolutions its
point crosses the needle just above the eye where the bend made by the thread
leaving the needle eye and passing up to the work, tends to hold the thread out from
the needle. With a hook so timed a very small retardation of the look's motion
will bring the hook point up to the needle so late that instead of passing above the
thread it will strike and probably cut the said thread. By the use of the single idler
in place of two idlers the liability to this retardation is very much diminished since
the wear on the teeth of the driving gears which manifests itself at once in retardation
of the hook is so much less with the single idler as very materially to improve the
machine in this respect.
Further any deformation in the teeth of the gearing for example manifests itself in
retarding the motion of the rotary hook and tends to make it cross the needle too late
in the ascent of the needle to take the loop. The difference in liability to deformation
between the leather teeth on the large single idler and those on two smaller gears is
decided and important particularly in view of the extreine accuracy in the timing of
the rotary hook which has been found to be necessary to the best working of the
machine.
The following is a description of what is considered the best mode of applying
the principle of the invention reference being had to the accompanying drawings
which form part of this Specification.
Figure I is a front view of a sewing machine constructed in accordance with this
invention.

page_text: Figure 11 is a vertical section (drawn to an enlarged scale) through the standard
of the goose neck.
Figure 1II is a detail view and
Figure IV is an end elevation partly in section looking towards the head of the
machine and also drawn to an enlarged scale.
The main shaft C turns in bearings in the goose neck or overhanging stationary
arm B and is driven by a belt on a fast pulley (or it may be by any suitable means)
in the direction indicated by the arrow Figure II. The rotary hook shaft D is
supported in journal-bearings under the work plate A and is driven from the 1
gear
on the main shaft C through the intermediate toothed wheel or idler 2 and the pinion 3
meshes with both the
fast on the rotary-hook shaft D. The intermediate or idler
gear 1 and the pinion 3 and revolves with comparative slowness owing to its large
Size. The number of teeth on the gear 1 is a multiple of those on the pinion 3 (3 times
as shown) so that a multiple revolution (as compared with the main shaft is conveyed
to the rotary hook shaft. The idler 2 is made with teeth of leather or other noise
deadening material and the gears 1 and pinion 3 with metal teeth. The rotary hook K
with its bobbin, bobbin case, and bobbin holder, is the same as described in the
Specification to Letters Patent No. 16768 of December 21st 1886.
The rotary take up H is fastened to the outer end of a crank F¹ which is fixed on
the end of the main shaft as in the machine described in the last mentioned Specifi-
cation but the relative positions of the take-up pins h² h³ is reversed to conform to
the new (or reversed) rotation of the main shaft C. The upper thread guide 4 also
is altered in position being placed behind instead of in front of the needle-bir F.
The lower thread guide is made to be shifted or adjusted automatically with the
thickness of work under the presser-foot. It is carried by the lower end of the
vertical arm of a bent lever or hell crank N fulcrumed at 12 on a stud which is tapped
into the lever and turns in a boss 13 on the head of the machine.
The horizontal arm of the bell crank N is connected with the presser bar G so
that when the latter occupies a higher position in consequence of an increase in the
thickness of the work under the presser-foot the thread guide 4 is adjusted toward
the back of the machine so that the take up pin 2 strikes the thread earlier in its
revolution. An auxiliary take-up or thread controller is shown in connection with
the rotary take-up H but as it is substantially or may be precisely the same as in the
said patent machine last herein before referred to it need not be described here.
The needle bar F is reciprocated by the crank F¹ on the main shaft through a pitman
and cross head as in the said last mentioned machine.
The feed surface is on the four motion feeding bar P below the work plate A and
is operated from the eccentrics E E', on the main shaft Cat the standard of the goose
neck, through the vertical connections consisting of the connecting rods QQand.
the horizontal connections comprising the rock shafts R R which are journaled in
bearings 34 and 35 under the work piate A.
The relative position of the feed advancing eccentric E and feed lifting eccentric E¹
on the main shaft C is shown in Figure III.
The means for giving an adjustable stroke to the feed bar P consist of three parts
namely first the lever U fulcrumed at 18 on the machine frame and provided with a
vibratory arm 15 second the link S provided with a projection 16 in the path of the
arm 15 and at its rear end jointed to the upper end of the arm 17 of the feed
advancing rock shaft R and third the band actuated regulator T in the form of a.
crank disk which is mounted on a stud 23 screwed into a projection 24 of the machine
frame and whose crank pin 25 fits in the groove 26 in the link S so that by turning
the said regulator the crank pin raises or lowers the link S and thus sets the pro-
jection 16 farther from or nearer to the axis of vibration of the arm 15 while at the
same time it does not interfere with the reciprocation of the said link. The adjust-
ment of said projection 16 of course regulates the movement communicated through
the link S to the rock shaft R.
The lower end of the connecting rod Q is jointed to an arm of the lever U so that.
as the shaft C rotates and the eccentric E reciprocates the connecting rod Q the latter-

page_text: imparts vibration to the lever U whose arm 15 acting against the projection 16 moves
the link S and feed advancing rock shaft R. The motion thus imparted to the rock
shaft R is in one direction only since it is preferred to return the said shaft by means
of a spring V which is set in a hollow boss 21 on the underside of the work plate
and is interposed between the body of the work plate and the horizontal arm 22 of the
rock shaft so as to press the said arm downward.
The feed bar (see Figure IV) is connected with the upright arm 30 of the feed
advancing rock shaft R through a journal-pin and with the horizontal arm 31 of the
feed lifting rock shaft R¹ by the upright link 32 and the feed lifting rock shaft is
vibrated by the connecting rod Q whose upper end encircles the eccentric E' and
whose lower end is connected by a journal pin with the arm 33 (see Figure II) of
said feed lifting rock shaft R'.
In operation the main shaft C the gears 1 2 and 3 and the rotary hook shaft D are
revolved in the direction of the arrows Figure II the needle bar F is reciprocated by
the crank F' the rotary take up H revolves in the same direction as the rotary hook
and the feeding bar P is lifted advanced lowered and returned by the eccentrics E E'.
The sewing operation is the same as in the machine described in the Specification of
the Patent of December 21st 1886 only it is effected with less friction and with
reversed motion of the main shaft ((or motion away from the operator) the rotary
take up and feed mechanism being adapted to act in due season with this new (or
reversed) revolution of the main shaft C.
The feed mechanism shown is described herein as an example of a suitable feed
mechanism and not as restricting the invention thereto or to any particular form of
said mechanism. The mechanism with two feed eccentrics shown in the Specification
before mentioned could be used instead the eccentrics being properly placed on the
main shaft.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed I declare that what
I claim is
First. The combination with the main shaft turning in bearings of the goose neck
the needle mechanism the take up in the head of the machine and the feed mechanism
the rotary hook shaft under the work plate and the rotary hook mounted on the said
rotary hook shaft of the gear on the said main shaft at the standard of the goose neck
the pinion below it on the rotary hook shaft and the intermediate toothed wheel or
idler extending from the said gear to the said pinion and meshing with both, the
number of teeth on the said gear being a multiple of those on the said pinion so that
a multiple revolution is given to the said rotary hook through the comparatively large
gear and the slowly revolving intermediate gear, and the said needle mechanism take
up and feed mechanism being operated in due relation to the said multiple revolving
rotary hook by the said main shaft revolving in the same direction as the said rotary
hook substantially as described.
Second. The combination with the main shaft turning in bearings of the goose
neck the needle mechanism driven by the said main shaft the rotary take up fixed to
and revolving uniformly with the said main shaft in the same direction as the feed
mechanism driven from the said main shaft the rotary book shaft under the work
plate and the rotary hook mounted on the said rotary hook shaft of the gear on the
said main shaft at the standard of the goose neck the pinion below it on the rotary
hook shaft and the intermediate toothed wheel or idler extending from the said gear to
the said pinion and meshing with both, the number of teeth on the said gear being a
multiple of those on the said pinion so that a multiple revolution is given to the
rotary hook through a comparatively large and slowly revolving intermediate wheel,
and the said needle mechanism rotary take up and feed mechanism being operated in
due relation to the said multiple revolving rotary hook by the main shaft revolving
in the same direction as the said rotary hook substantially as described.
Third. The combination with the main shaft turning in bearings of the goose neck
the needle mechanism the take up and the feed mechanism cach operated by the said

page_text: main shaft the rotary hook shaft under the work plate and the rotary hook mounted
on the said rotary hook shaft, of the metal gear on the said main shaft at the standard
of the goose neck the metal pinion below it on the rotary hook shaft and the inter-
mediate wheel or idler with leather or noise deadening teeth extending from the said
gear to the said pinion and meshing with both, the number of teeth on the said gear
being a multiple of those on the said pinion so that a multiple revolution is given to
the said rotary hook through the comparatively large and slowly revolving leather
toothed intermediate wheel and the said needle mechanism take up and feed mechanism
being operated in due relation to the said multiple revolving rotary hook by the said
main shaft revolving in the same direction as said rotary hook substantially as
described.
Fourth. The combination with the rotary take up and the presser foot and presser
bar and the adjustable or shifting thread guide for the said take up, of the bent lever
or bell crank having its horizontal arm connected with the presser bar and its vertical
arm carrying the said thread guide at the lower end thereof substantially as
described.
Fifth. The combination with the main shaft mounted in bearings of the goose neck
and turning away from the operator the needle mechanism driven by the said main
shaft the rotary take up fixed to and revolving uniformly with the said main shaft in
the same direction, the feed mechanism driven from the said main shaft the rotary
hook shaft under the work plate and the rotary hook mounted on the said rotary hook
shaft of the gear on the said main shaft at the standard of the goose neck the pinion
below it on the rotary hook shaft and the intermediate toothed idler extending from
the said gear to the said pinion and meshing with both, the number of teeth on the
said gear being a multiple of those on the said pinion so that a multiple revolution is
given to the said rotary hook the main shaft being provided with a driving pulley and
the take up being provided with eccentric pins for acting on the thread a lower
thread guide near the needle bar and an upper thread guide behind the needle bar
substantially as described.
Sixth. The combination with the main shaft turning in bearings of the goose neck
the needle bar driven from the said shaft by a plain crank mechanism and the gear on
the said main shaft at the standard of the goose neck of the multiple revolving rotary
hook and hook shaft the pinion on the said hook shaft having a fraction of the number
of teeth on the said gear and the single idler meshing with both the said gear and the
said pinion and imparting the multiple rotation to the latter from the former substan-
tially as described.
Seventh. The combination with the main shaft turning in bearings of the goose
neck the needle bar driven from the said shaft by a plain crank mechanism and the
metal gear on the said main shaft at the standard of the goose neck, of the multiple
revolving rotary hook and hook shaft the metal pinion on the said hook shaft having
a fraction of the number of the teeth on the said gear and the single idler meshing
with both the said gear and the said pinion and imparting the multiple rotation to the
latter from the former substantially as described.
Dated the 11th dox of Tri 1200
J. H. JOHNSON & Co.,
Agents.