Improvements in Sewing Machines.
Year: 1893

page_text: Date of Application, 27th Dec., 1893-Accepted, 24th Feb., 1894
COMPLETE SPECIFICATION.
Improvements in Sewing Machines.
1, JAMES YATE JOHNSON of 47 Lincoln's 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 Joseph Leonard Follett, Fudge Building corner
of 5th Avenue and 16th Street, New York City in the County of New York,
State of New York, United States of America, Gentleman) 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 what are known as oscillating hook lock-stitch sewing
machines that is to say, sewing machines in which the under device which
co-operates with the needle to form the lock stitch is a hook to which oscillatory
movement is imparted by suitable means.
The hook is caused to move more than a half revolution (180°) in each direction
for each rise and fall of the needle bar or in other words for one full revolution of
the needle bar driving shaft; consequently the shaft on which the hook is secured
oscillates nearly a full revolution in each direction during every complete revolution
of the needle bar driving shaft. The main objects of this invention are, to so
connect these two shafts as to obtain easy and noiseless operation of the two
under these conditions, and to adapt for use in this connection the other devices
such as the take up and the feed mechanisms, which co-operate with the needle and
hook in the sewing operation.
The invention can best be explained and understood by reference to the accom-
panying drawings which represent a lock-stitch sewing machine of the oscillating
hook type embodying these improvements in their preferred form.
Figure 1 of the drawings is a sectional side elevation of the sewing machine-the
line of section being on the line 1-1, Figure 2.
Figure 2 is a view of the underside of the machine.
Figure 3 is a face view of the head of the machine with the front plate
removed.
Figure 4 is a longitudinal vertical central section of the complete machine with
the front plate of the head detached and placed at a distance to the left of the
head, in order to avoid obscuring the parts; and also with the bobbin ejected and
occupying a position below the machine.
Figure 5 is a sectional detail drawn to an enlarged scale of the bobbin
ejector.
Figures 6, 7, 8 and 9, are front views of the stitch forming devices showing the
take up and hook in the different positions which they assume during the operation
of forming a stitch.
Figure 10 is an enlarged sectional detail of the thread retainer which operates in
connection with the take up arm or lever.
Figure 11 is a section on line 11-11, Figure 1.
Figure 12 is an enlarged sectional detail of one of the driving straps for the
under shaft, and the parts to which it is secured.
Figure 13 is a top plan drawn: to: an enlarged scale of the feed actuating and
adjusting devices.
Figure 14 is a transverse vertical section also drawn to an enlarged scale through
the cloth plate and centrally of the feed bar and its adjuncts.

page_text: Figures 15, 16, 17 and 18 are enlarged perspecave views of the several portions
of the feed proper.
Figures 19 and 20 are respectively views of the driving wheel, and the device for
securing it to the upper shaft.
Figure 1 is an enlarged perspective view of the hook looking at it from the
front.
Figure 22 is a like view looking at it from the rear; the plate which closes the
rear of the hook being removed.
Figure 23 is a front elevation of the hook.
Figure 24 represents drawn to an enlarged scale a front elevation. a rear elevation
and an axial section of the hobbin case and bobbin.
Figure 25 is an axial section, drawn to a still larger scale, of the bobbin case and
cover, and bobbin detached from each other.
Figure 26 is a side elevation of the hook drawn to an enlarged scale, and a
portion of its shaft, and the needle with which, the hook co-operates.
A is the base or bed plate, B the bracket arm or goose-neck, and C the upper or
driving shaft provided with a fly and pulley wheel C from this shaft the needle
bar and take up are actuated. D is the under or counter-shaft, from which the
feed and the oscillating hook derive their movements.
The hook which is so constructed that in itself it takes, spreads and sheds the
loop of needle thread, has imparted to it a reciprocating rotary movement of nearly
a full circle in each direction, for each up and down movement of the needle.
And as the needle moves up and down once during each revolution of the driving
shaft, it follows that the under or counter-shaft on which the hook is mounted must
rotate nearly a full revolution in each direction for every complete revolution of
the driving shaft. The means which are preferably employed, for obtaining these
movements are as follows:-
The under or counter shaft D is connected at its rear end to the rotating driving
shaft by means of two straps or belts a a' each attached at one end to the shaft D
and extending on opposite sides of the shaft to connections which in this instance
are studs or pius, projecting from opposite sides of a reciprocatory connecting
rod which is connected at its upper end to a crank or its equivalent ou the
driving shaft C; and supported at its lower end in a rocking bearing d, in which it
is free to slide. The rod extends cross wise of the shaft D, and the pins or
laterally-projecting studs 63 (which may be provided with loose friction sleeves if
desired) to which the belts or straps a, a' are secured, are located on the rod b
respectively above and below the shaft D. A balance weight on the driving
shaft C steadies the revolution of the latter. When the driving shaft is rotated
oscillatory movement is imparted to the under shaft through the straps a a' due to
the reciprocations of the rod b, the straps being for this purpose wound in opposite
directions on the under shaft, the arrangement being such that as the one strap
winds upon, the other strap unwinds from the under shaft. The length of that part
of each strap which winds upon the shaft must be at least equal to the throw of the
crank and the extent of oscillatory movement imparted to the shaft D and
consequently to the hook carried thereon depends upon the length of throw of the
eccentric, and the diameter of that portion of the shaft D upon which the straps
wind.
It is preferred that each strap should consist (as shown in Figure 12) of an
endless belt or band (preferably oiled linen tape) which passes around a pin or stud
on the rod and around the shaft D, to which latter it is held by a sleeve e
encircling the shaft so as to draw the band closely around it, the said sleeve being
longitudinally slotted at e¹ for the passage of the two plies of the band. Each
sleeve held to the shalt by a set screw; and the contiguous ends of the two
sleeves fit upon and are supported by a cylindrical hub or thimble placed on the
shaft between the two sleeves.
By loosening the set screws e² the sleeves can be turned and adjusted on the shaft
so as to take up slack and secure any desired tension on the belts or straps. -

page_text: In this way for every revolution of the driving shaft C there is imparted to the
shaft Da rotary movement of nearly a complete revolution in each direction, and
at all times absolutely positive, smooth and uniform and without shock or jar.
or extent of
is
The hook which is fast upon the front end of the shaft D of course partakes of
the movement of the shaft. The feed also takes its movement from the same shaft.
As the shaft moves considerably more than a half revolution in each direction, an
eccentric or crank connection for actuating the feed would be impracticable. To
overcome this difficulty and to impart a regular and positive to and fro movement
to the feed bar without cam or spring and irrespective of the degree
Oscillation of the shaft from which the movement is derived a screw-thread
provided on the shaft D, near its forward end just rear of the hook; and encircling
the shaft at this point and engaging the thread is a correspondingly internally
screw threaded runner sleeve or nut, which is held so that it shall not rotate with
the shaft D and consequently as the shaft oscillates the sleeve will move back and
forth on the shaft. This movement of the sleeve will at all times be perfectly
regular, uniform and positive, although the extent of that movement will of course
he determined by the extent of oscillation of the shaft as well as by the pitch of the
screw thread thereon.
To this sleeve the feed bar is connected by intermediaries, the construction of
which may be widely varied by the skilled mechanic. As shewn in the drawings
Figures 2 and 13 a vibratory lever y is connected to and reciprocates the feed bar,
the said vibratory lever being pivotted at g' to the under side of the bed plate and
connected to the sleeve by a connecting rod pinned to the lever at h, and
having its other end bifurcated or yoke shaped, the two arms of which yoke are
pinned at 2 to diametrically opposite sides of the sleeve / In this way, when the
sleeve moves back and forth, the lever through the connecting rod will be
vibrated and transmit movement to the feed bar. To vary the stroke of the lever !
and consequently the length of movement of the feed bar, the connecting rod 7
instead of being pinned directly to the feed lever y is pinned to a slide ³, mounted
and capable of movement in a slot formed lengthwise of the lever. On the
upper side of the slider 3 or the side opposite to that on which the connecting rod
is pinned, is a roller stud which is engaged between the parallel jaws of an
adjuster i (Figure .13) which adjuster is longitudinally slotted at to fit upon and
be held by a guide block fixed to the under side of the cloth plate.
The adjuster can move back and forth on the guide block j, and in so moving
will carry with it the slide 3, thus moving the point of attachment of the
connecting rod nearer to or further from the fulcrum of the feed lever g. The
nearer the point of attachment is to this fulcrum the greater will be the throw of
the feed lever, and consequently the more extensive will be the reciprocations of
the feed bar connected to it. In this way the feed can be easily regulated.
To provide for the ready adjustment of the adjuster i the fixed block has
swivelled to it a screw threaded rod or shaft k which passes through and engages
the adjuster and extends back to a point on the under side of the bed plate, where
its rear end is supported in bearings, and is provided with a milled wheel
which projects partly up through a slot formed for this purpose in the bed plate.
By turning this wheel the feed can be readily and conveniently adjusted to a nicety
by the operator while the machine is in full operation.
The feed-device proper, is shown in detail in Figures 14-18 inclusive and
consists of four principal parts, iz., the feed bar 1, a second bar m, which the
inventor terms the tension bar, the feed block a, and the supporting frame o.
The frame o which when in place is secured to the under side of the cloth plate,
is suitably formed and recessed to receive and accommodate the moving parts of
the feed. In it is first placed the sliding feed bar 1, and over this bar is placed the
tension bar m with the feed block n.
The feed bar has on its under face ribs forming a guide way in which fits so as
to be free to move therein, the slide, to which the vibrating feed lever y is pinned
as indicated in Figures 14 and 2. On the upper face of the feed. bar is a

page_text: projection 12 (preferably of some sound deadening material) which lies between, and
is intended to intermittently engage one or the other of two ribs or projections m
on the under side of the tension bar m for the purpose of imparting to the latter an
intermittent movement of reciprocation; and it is also provided on its upper face
with a wedge shaped or inclined projection 13 through the instrumentality of which
the feed block n is given its up and down movement.
The tension bar is provided with a central opening m² for the reception of the
feed block n.
The feed block fits loosely in this opening and rests by gravity upon the feed barl;
and when it is in place in the machine and the usual presser foot is down, the latter
of course bears upon the feed block in the customary way. The block has on its
upper surface ordinary or suitable feed teeth, and to prevent it from accidentally
tipping out of the machine, its ends are provided with dowel pins n' which fit in
vertically-elongated recesses or slots m³ formed in the tension bar. The block n
can thus move up and down freely and to the required extent, but is prevented from
accidentally getting out of place when the presser foot is up. The under surface
of the feed block is inclined at n² corresponding to the incline or wedge ³ of the
feed bar.
There is sufficient space between the ribs m' to allow the projection of the feed
har a certain freedom of motion between them. During this portion of its move-
ment the wedge on the feed bar acts on the feed block to bring about the up or
lown motion and then the engagement of the feed bar projection with one or
the other of the ribs m' will produce the longitudinal movement of the tension bar
and consequently of the feed block.
"
In order to retain the tension bar in position during the up and down movements
of the feed, the frame is provided at its further end, with a socket of containing a
pad 2 which by a spring 3 is pressed against the adjoining under face of the
tension bar m as shown more plainly in Figure 14. The pressure of this spring is
controlled by a regulating screw o, by means of which the spring can be caused to
bear with more or less force as desired against the friction pad.
By removing the tension to a great extent if not entirely, the feed when properly
adjusted will move the lightest fabrics without raising the presser foot or forcing
the teeth into the goods to their injury.
The hook E is fast to the front end of and moves with the oscillating shaft D.
It is provided as usual with a circular recess for holding the bobbin which latter
with its case is represented more clearly and in detail in Figures 24 and 25. F is
the bobbin F¹ is the case; and F is the cover or shield.
The bobbin has a hollow barrel which fits upon a hollow stem projecting from
the rear end of the case F'; and the cover or shield F2 has also a hollow central
stem which fits into the hollow stem of the case F'. In this way when the
parts are fitted together there is provided a tubular passage axially through the
bobbin and bobbin case from front to rear. Through this passage the bobbin
thread leads from the bobbin to the work. The object of this central or axial
thread delivery is to always have the bobbin thread the same length from the
delivery end of the bobbin or bobbin case to the goods without slack, thus giving
uniform length of thread and correct and perfect tension and preventing the
under thread from catching on the point of the hook, which it would do if at
any time slack.
The shield or cover also assists the bobbin case in entirely
surrounding the bobbin, which is thus removed from any influence that might
otherwise be exerted upon it by the hook or by the upper thread, and is left to
play inside the case perfectly free, the case and shield being so proportioned that
when fitted together around the bobbin, the latter is pressed against neither of
them.
The rear face of the bobbin case has a shallow circular external recess in it to
receive the slotted spring tension plate or disc F³, which is secured to the case
by a screw F that also serves as an adjusting screw by which the tension may be
regulated.

page_text: The form of the tension disc F3 is shown in the rear elevation of the bobom case
in Figure 24. It is slotted and cut away from the periphery to the centre to
forn a spring tongue under which the thread can be drawn, the slot terminating at
a point where it leaves open the axial thread passage through the holibin case.
The course of the thread from the bobbin to the outside is shown in Figure 25.
From the bobbin it passes through the three holes 1, 2, 3, in the bobbin case, thence
under the spring tension tongue and thence through the axial thread passage from
rear to front of the bobbin case. When thus threaded the under thread is in
position for use without further adjustment.
The bobbin case and enclosed bobbin are kept in place in the recess in the look
by a holder G (Figures 1 and 4) attached to a bracket G adjustably secured to
the under side of a sliding cover G in the cloth or bed plate. For the
purpose of readily removing the bobbin (which of course can only be done when
the holder is drawn back as in Figure 4) there is provided an ejecting mechanism
consisting of an ejector rod II, arranged to slide within the front portion of the
shaft D (which is tubular) and to project through an axial hole in the rear end of
the hook. The rod is secured at its rear end to a cylindrical guide block H' which
A pin on
fits and can slide in the shaft D, and is held retracted by a spring H².
the block H projects through a longitudinal slot in the shaft (see Figure 5) so as
to be in the path of a sleeve H loosely encircling the shaft and having a vertical
portion H extending up through a slot in the bed plate, in a position to be easily
manipulated. By pushing forward the sleeve by the vertical portion H', the
ejector will be advanced and caused to eject the bobbin.
Of the sewing devices which are located below the cloth plate it remains only to
describe the oscillating hook E. Its range of oscillation will be seen and
appreciated by reference to Figure 23, in which represents the line from which
it starts in moving forward or to the left, and y is the line which it reaches on the
completion of that forward movement-nearly a full revolution in fact; and of course
it moves back in the same path, thus making nearly two complete revolutions, one
in each direction, for each up and down movement of the needle.
The object is to provide a hook having this range of oscillation which shall
without the assistance of extraneous devices, be capable of taking, spreading and
shedding the loop of needle thread without friction or drag and with that
uniformity and certainty which is absolutely essential in a high speed sewing
machine.
The hook, and the receptacle for the bobbin case are formed in one for
convenience sake. From the loop taking point of the hook, diagonally back to
the rear plate there is a slot 5 which after it reaches the rear plate extends
circularly around the hook, as at 6, for more than a half circle. The exterior or
periphery of the hook back of the point is bevelled from front to rear, thus
providing a coutinuous incline whereby as the hook, after having taken the loop
proceeds on its way, the loop is spread, and the leg of the loop furthest removed
from the needle is cast easily and surely over the back of the hook, following the
diagonal slot 5, until it reaches and passes into the circular slot 6, and is carried
over and around the under thread. In Figure 6 the book is represented as just
taking the loop, and in Figure 8 as just shedding or casting it off. To attain this
result it is essential that the hook should have in substance the shape specified and
that it also should have the extended range of oscillation hereinbefore indicated.
The hook E is provided also with a loop retainer E' between which and the
look is a space for the bight of the loop taken by the hook. The retainer operates,
after the hook passes below the bobbin and beyond its centre, to retain the loop
until the latter is brought past the centre and to a position where it is ready to be
cast off as in Figure 8.
The needle which is very short is recessed just above the eye on the side next
to the hook as indicated in Figure 26, and the point of the hook in taking the
loop passes close to the needle and in this recess. The part of the hook next to
the needle is thus really within the vertical line of the body of the needle, so that

page_text: the swell of the needle, or rather the unrecessed portion of the needle below its
-eye, in moving up and down would rub against the hook, and thus press the thread
between the hook and the needle, creating friction and possibly breaking the thread,
unless some means were taken to prevent this from occurring. All difficulty on
this score is obviated by recessing the front face of the hook at the points where
the needle passes it in its ascent and descent-these points being just back of the
point, and at or near the heel, say at the points and, as indicated in
Figures 21, 23, 26-so as to provide sufficient clearance to prevent injurious friction
between the needle and hook.
There are surface grooves represented at one or more points in the hook; but
they are simply occasioned by the removal of surplus metal, with a view to make
the hook as light as consistent with strength and durability.
That portion of the sewing mechanism above the cloth plate will now be
described with reference more particularly to Figures 1, 3, 4, 6, 7, 8 and 9
inclusive of the drawings.
On the forward end of the upper or driving shaft C is a balanced crank C
connected by a pitman C to the needle bar C³, which latter reciprocates vertically
in a guide way in the head of the bracket arm B in the usual way. Rigidly
secured to the crank is a dise or plate C on which is swivelled at 8 the
bearing 9 through which passes the take up lever I which at 10 is pivotted to the
head of the machine. As the crank revolves, the hearing 9 will move with it, and
this will impart to the take up lever a vibrating movement on its pivot 10 as
an axis the lever in thus moving sliding back and forth through the swivelled
bearing 9.
The oscillating hook action hereinbefore described requires a quick delivery of
the needle thread to the hook, and a comparatively slow take up movement at
first, followed by a very speedy take up action. The quick delivery is required
because of the rapid movement of the hook; the initial comparatively slow take
ap movement is made necessary because the hook at this time is still within the
loop and the movement necessarily must be gradual until it withdraws; the final
speedy take up action is required because all of the slack, of which considerable
remains after the hook withdraws, must be taken up during the short remaining
part of the driving crank's movement which can be availed of for that purpose,
particularly if it be desired to set the stitch before the needle again enters the
work.
The object is to thus actuate the take up lever from the driving crank, without
requiring irregularity in the movement of the driving mechanism or the inter-
position of special appliances for imparting the varied movements required.
The crank C and the part attached to it are revolved by the driving shaft C in
the direction of the arrows, on the part C in Figure 3.
The extreme upward movement of the take up lever is when the swivelled
bearing 9 is vertically over the axis of motion of the crank C'; as the latter
proceeds on its way the bearing 9 moves nearer to the axis or fulcrum of the take
up lever, thus imparting to the take up lever a very rapid downward or delivery
movement. The rate of movement will be appreciated by reference to Figures 9
and 6. In Figure 9 the take up is at its highest point, the hook is about to
Oscillate backward and the needle has nearly entered the cloth. By the time the
needle has completed its descent, and the hook has returned and has just entered
another loop, as in Figure 6, the take up will have moved from the position shewn
in Figure 9, to that shewn in Figure 6; it will indeed have completed the whole of
its down movement, save the slight distance indicated as existing between the
take up's position in Figure 6, and that in Figure 7, where the take up is at the
end of its down streke. From that int the take up movement begins; but that
movement is gradual at first for the reasons hereicbefore explained. This gradual
and comparatively slow movement is obtained because the swivelled bearing 9 is
travelling at this time through that portion of its course where it is more distant
from the fulcrum of the take up lever. It recedes from the fulcrum until it rises

page_text: above the horizontal diameter of the circle in which it travels; and consequently.
it's movement at this time and indeed for some time following is slow, as will be-
understood by a comparison of Figures 7 and 8. Figure 7 represents the parts in
the position they occupy when the take up is at the extreme of its down movement
and Figure 8 represents them in the position which the take up assumes when the
hook has travelled far enough to about cast off the loop. In this way two of the
required movements are obtained. The third movement is, the quick final
take-up action, is obtained as follows:
The take up lever at its outer end has two eyes 12, 12, through which the thread
is passed.
These eyes project out from the front plate of the head of the machine
through slots 13, 13, therein, curved to the path of movement of the eyes. On.
the part of the plate between these slots, and at the proper point in the up stroke.
of the take-up lever, is a pin 14. When the take up is at that point of its stroke-
requiring quick take-up action, the thread which is stretched across between the
two eyes 12, will bring up against the pin 14. Further upward movement of the
take up will have the effect, as indicated in Figure 9 of taking up very much
more thread than would be possible during the same movement in the absence of
the pin the parts are so adjusted, that by this quick action, not only is the loop-
completely taken up and the stitch set, but at the same time sufficient thread is
pulled from the spool for the next stitch and to form a loop long enough to pass.
over the under thread without straining.
The pin 14 is engaged by a metallic guard strip 15 fastened at one end to the
face plate and provided with a hole to receive the pin as shown in Figure 10.
This is a mere retaining device to prevent the thread (which passes between the
face plate and the strip) from escaping the pin 14.
The thread passes from the spool through the open bearing 16 on top of the
head, then through the tension 17,-around the spring yielding hook 18, thence
through the eyes 12 of the take up lever and thence to the needle.
The construction of the tension 17 is shewn clearly in Figures 4 and 6; but it.
does not require particular description; inasmuch as any known or suitable tension
device can be used.
The spring hook 18 projects through and moves back and forth in a slot in the
face plate. Its shank terminates in a coiled spring which secured to the inner
side of the face plate as seen in Figure 4.
The pulley and fly wheel is on the rear end of the driving shaft C, which in
its end has a cross slot 19 and a central screw threaded hole. In the hub of the
wheel also there is a cross slot 20, to match the slot 19. To secure the pulley to
the shaft an attachment is used consisting of a boss 21, with a hole for the passage:
of a screw 22, and lugs 23 projecting froin the boss and forming a key. This key.
is inserted into the single slot formed by the registering of slots 19 and 20, and the
wheel and shaft are thus locked together making it impossible for the wheel to
turn on the shaft.
In practice the shaft does not quite come to the outer end of the hub of the
wheel, so that the lugs 23 bear on the hub only; and thus when the screw 22 is.
driven home into the end of the shaft it will drive the wheel up as far as it can
go on the shaft, taking up all lost motion or end play.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The combination with the needle bar, take up, feed and hook, of the upper or
driving rotary shaft connected to and operating the needle bar and take up, the
under oscillating shaft connected to and operating the hook and the feed, the
reciprocating rod connected to and actuated by a crank on the driving shaft and
extending crosswise of the under shaft, and straps connected to the said under shaft
and extending from opposite sides thereof to connections on the reciprocating rod
located respectively above and below the under shaft, and arranged so that when

page_text: the rod reciprocates the one strap will wind upon as the other unwinds from the
under shaft, imparting to the latter an oscillating movement of nearly a full revolu-
tion in each direction for each complete rotation of the driving shaft, substantially
as and for the purposes hereinbefore described.
2. In combination with the oscillating under shaft, a runner sleeve engaging a
screw thread on said shaft, whereby it is caused to have a regular movement of
reciprocation during the oscillating movement of the shaft, a sliding feed bar, and
connections between the said feed bar and the runner sleeve whereby the said bar
is reciprocated by or from said sleeve, substantially as and for the purposes
hereinbefore described.
3. The combination with the oscillating hook shaft, and the runner sleeve engaging
a screw thread on the said shaft, of a feed bar, a vibratory feed lever connected to
and adapted to move the feed bar, and a connecting rod pinned on the one hand to
the sleeve and on the other hand to the feed lever, substantially as and for the
purposes hereinbefore described.
4. The combination with the oscillating hook shaft and the rummer sleeve engaging
a screw thread thereon, of a feed bar, a vibratory feed lever connected to and
adapted to move the feed bar, a slide or bearing on the feed lever adjustable
to and from the fulcrum of said lever, and a connecting rod jointed on the one
hand to the runner sleeve, and on the other hand to the adjustable slide or
hearing on the feed lever, substantially as and for the purposes hereinbefore
described.
5. The combination of the oscillating under shaft; the runner sleeve engaging a
screw thread thereon; a feed bar; a vibratory feed lever for reciprocating the said
bar a connecting rod jointed on the one hand to the runner sleeve, and on the other
hand to a slide or bearing mounted on and movable lengthwise of the feed lever,
and means for adjusting the said slide provided with an operating handle which
projects up through the bed plate of the machine, substantially as and for the
purposes hereinbefore described.
6. In combination with the vibratory feed lever, the adjustable slide on the same
for attachment of the connecting rod by which the lever is actuated, the adjuster
engaging a stud on the said slide and longitudinally movable for the purpose of
adjusting the said slide, and the screw threaded adjusting rod supported in bearings
beneath the bed plate, engaging the said adjuster, and provided with a handle
extending up through a slot in the bed plate, substantially as and for the purposes
hereinbefore described.
7. The reciprocable tension bar and the feed block contained loosely in the said
bar so that while moving lengthwise with the bar it may be capable of an up and
down movement independently of the said bar, in combination with the reciprocatory
feed bar provided with a projection to intermittently engage projections on the
tension bar for the purpose of giving the to and fro feed movement, and having
incline which in the intervals between the to and fro movement of the tension
bar, engages and causes the rise and fall of the feed block carried by the said
tension bar, substantially as and for the purposes hereinbefore described.
an
8. The reciprocable tension bar, and the feed block carried by the said bar and
movable up and down independently thereof, in combination with the reciprocatory
feed bar, adapted to intermittently operate the tension bar and provided with an
incline or swell to produce the rise and fall of the feed block, while the tension bar
is at rest, and an adjustable tension device arranged to act on the tension bar so as
to offer a resistance (variable at pleasure) to the movement of the latter, substan-
tially as and for the purposes herein before described.
9., The combination of the feed bar, the tension bar m, the feed block n, the
frame 0, and the spring tension device-these parts being constructed and arranged
together for joint operation as hereinbefore shown and described.
10. The oscillating hook, having a central receptacle for the bobbin, a loop
taking point, and, bounding the rear edge of said hook, a slot which extends back
to the rear and joins a circular slot extending part way round the body of the

page_text: bobbin receptacle, the hook at back of its point gradually widening and being
bevelled or made sloping from its front to its rear face, so that the loop which it
takes shall be spread and carried over the body of the hook without friction or
strain, substantially as hereinbefore described.
11. The bobbin case having a spring tension device located in an external recess
in its back, thread holes through which the thread from the bobbin may be led to
the said tension, and a central thread passage through which the bobbin thread may
be led from the tension on the back, to and out from the front of the case,
substantially as and for the purposes hereinbefore described.
12. The bobbin, the bobbin case provided with a spring tension located in an
external recess on its back, and with thread holes, and the bobbin cover or shield,
the bobbin, bobbin case and bobbin shield, each having a central tube, the said
tubes nesting one in another, and forming when the parts are put together a central
thread passage through which the thread can be led from the tension on the back
of the case out to and beyond the front of the shield or cover, substantially as
hereinbefore described.
13. The combination with the reciprocating needle and needle bar, the oscillating
hook, and means for imparting to it movement of more than 180° in each direction
during each up and down movement of the needle, of take-up mechanism arranged
and timed in its movements and operating substantially in the manner described to
deliver the needle thread quickly at the time the hook is taking the loop, to take
up slowly and gradually so long as the hook is in the loop, and finally during the
return movement of the hook to rapidly take up the thread and set the stitch,
substantially as hereinbefore described.
14. The combination with the reciprocating needle and needle bar, the oscillating
hook and means for imparting to it movement of more than 180° in each direction
during each up and down movement of the needle, of the vibrating take-up lever,
the swivelled crank bearing through which the said lever extends, and slides, and
the upper or driving shaft from which the said crank bearing is driven, the said
shaft being rotated in a direction to cause the swivelled crank bearing to move
toward the fulerum of the take up lever during that portion of its stroke in which
the thread is delivered to the needle and hook, thus insuring rapid delivery of the
needle thread, and a comparatively slow initial take up movement substantially
as and for the purpose hereinbefore described.
15. In combination with the pivotted take up lever, and the swivelled crank
bearing therefor arranged in its revolution to move towards the fulcrum of the
lever at the time the latter is moving in a direction to deliver the thread, of a
retaining pin arranged in the path of movement of the thread carried by the take
up lever so as to meet that thread at the required point in the up, or take-up,.
movement of the lever, and to hold back the thread at this point while the lever
completes its stroke, substantially as and for the purposes hereinbefore described.
16. The combination of the swivelled crank bearing, the pivotted take up lever,
provided with two eyes projecting through slots in the front plate of the head of
the machine curved to conform to the path of movement of the take-up-eyes, the
thread retaining pin placed between the two slots, and the guard strip or plate,
under which that portion of the thread between the two eyes passes, substantially
as and for the purposes hereinbefore described.
Dated this 27th day of December 1893.
J. H. JOHNSON & Co.,
Agents.