IMPROVEMENTS IN. AND RELATING TO SEWING MACHINES
Year: 1883

page_text: LETTERS PATENT to William Robert Lake, of the firm of Haseltine Lake
and Co Patent Agents Southampton Buildings London for an Invention of
"IMPROVEMENTS IN. AND RELATING TO SEWING MACHINES" communicated
to him from abroad by Thomas Crocker Robinson, of Boston and Ebenezer
Baker Welch of Cambridge both in Massachusetts, United States of America.
PROVISIONAL SPECIFICATION left by the said William Robert Lake at the
Office of the Commissioners of Patents on the 2nd May 1883.
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake and Co. Patent Agents,
Southampton Buildings, London " IMPROVEMENTS IN AND RELATING TO SEWING
MACHINES" [A communication to him from abroad by Thomas Crocker Robinson,
of Boston and Ebenezer Baker Welch of Cambridge both in Massachusetts, United
States of America]
This invention has for one of its objects to provide certain improvements in
sewing machines, whereby bindings may be secured to corsets. and other articles,
and the material to which the binding is being attached may be trimmed, if
desired, simultaneously with the attachment of the binding.
This invention also has for one of its objects to provide certain improvements
in sewing machine trimmer attachments einploying a fixed blade, and a recipro-
cating blade in rubbing contact with the fixed blade, whereby the desired degree
of impinging pressure of one blade against the other may be maintained and wear
of said blades compensated for; also to provide an improved folder attachment,
and a blower adapted to remove scraps and cuttings; to provide improved means
for operating a pivotted trimming or shearing knife by a vertically_reciprocating
knife bar and to provide certain other details of construction. The invention
consists in various improvements hereinafter described.
In carrying the said invention into practice I provide a binder of any suitable
construction (excepting as to the guard hereinafter described) arranged to fold a
strip of binding over the edge of a corset or other article in advance of the needle.
I also provide an auxiliary presser-foot (preferably a roll-presser) located in advance
[Price 8d.1

page_text: of the usual presser foot, that is to say between the latter and the operator. The
auxiliary foot may be supported by the ordinary presser bar or by an independent
bar, and when supported by the former the auxiliary foot is journalled on an arm
which is adapted to be swung upwardly on pivots so as to displace the auxiliary
foot when desired. In all cases the auxiliary foot is adapted to yield upwardly
independently of the foot so that when narrow parts of extra thickness, such as
the bones or stiffening strips inserted in a corset, pass under the presser foot each
foot can yield independently to such extra thickness, so that the bearing of the
other foot on a part of the article of lesser thickness will not be affected. The
yielding movement of the ordinary presser foot is effected in the usual manner, the
presser bar being held downwardly with a yielding pressure by a spring. The
yielding movement of the auxiliary presser foot may be effected by several
different means.
The arm may be pivotted to ears on a sleeve which is adapted to
slide vertically on the ordinary presser bar and is pressed downwardly by the
spring. The said arm may be pivotted to a plate which is pivotted to ears on a
collar rigidly attached to the presser bar, the pivot enabling the arm to oscillate
vertically between stops on the plate. A spring attached to the plate and bearing
at its free end on a pin on the arm, presses said arm and presser foot downwardly.
When the auxiliary presser foot is attached to an independent bar said bar is
adapted to slide vertically and is pressed downwardly by a spring like the
ordinary bar. The feed dog is elongated so as to co-operate with both presser
feet. In advance of the rear or delivery end of the binder, the throat plate of the
machine is raised, the forward end of the feed dog being correspondingly raised.
This raised portion raises the material in advance of the point where the folded
binding is presented to it, and prevents the inclined side of the binder from
crowding the material laterally away from the binder. The raised throat plate
includes a slot through which the vertically reciprocating trimming knife, herein-
after described, passes in making its cut. The elevated position of the slot due to
the raised throat plate enables the knife to properly perform its work without
interfering with the mechanism below the bed or work support of the machine.
The trimming knife is reciprocated vertically over the slot, its cutting edge
passing through said slot. The knife is attached to an arm or bracket which is
clamped by a set screw to a knife bar. The bar is vertically reciprocated by a
suitable connection with the sewing machine. The adjustable bracket enables the
cutting edge of the knife to be adjusted laterally so that when it is desired to
change the throat plate for one having its slots at a greater or less distance from
the needle to vary the distance between the trimming edge and the line of stitches
the knife can be adjusted to correspond with the slot in the throat plate. In any
throat plate that may be employed care should be taken to make the slot at such
an angle that the knife when adjusted to the slot will work with an impinging
cut against the inner edge of the slot in making its downward movement, like one
blade of a pair of shears against the other.
°
Said bracket also enables a knife with a straight shank to be employed and
constitutes a convenient means for properly offsetting the straight knife from the
knife bar and locating said knife sufficiently far in advance of the needle to admit
of the interposition of the folder between the knife and needle.
It will be seen that the two presser feet have independently yielding movements
in conjunction with the elongated feed dog, furnish an extended bearing for work
varying in thickness, and hold the same either for the binder, or for the trimmer,
or for both, making the operation of each of said attachments more satisfactory
than would be the case if only the usual presser foot were employed. The knife
may be attached directly to the knife bar, the latter being located farther forward
so that the bracket is not required. In this instance the knife bar is operated by
a connection with the driving shaft of the machine viz:-a positively operating or
grooved cam on a shaft, and a bell crank lever pivotted to a bracket on the arm of
the machine and engaged with the cam at one end by a pin passing through a slot
in the arm of the machine, and connected at the other end by a set screw with

page_text: the knife bar. Said set-screw passes through a block fitted to slide in a slot in
the lever and enters a block having a socket through which the knife bar passes.
By loosening said screw the knife bar is released from the block and arm.
I do not limit myself to the employment of the folder and trimmer, or either of
them, in connection with the two presser feet, as said feet arranged and operating
as described perform a useful function in holding down work of uneven thickness
for the action of the needle. Nor do I limit myself to the simultaneous employ-
ment of the binder and trimmer as either may be used without the other.
the binder and trimmer are both used the latter trims the edge of the material
before it receives the binding. The machine is provided with a guard or flange
which is interposed between the receiving end of the binder and the trimmer and
prevents the cuttings removed by the trimmer from entering the binder.
When
I provide a downwardly projecting arm attached rigidly to the head of the
machine and having in its lower end a screw held in a threaded orifice in said
arm and adapted to bear at one end against the side of the reciprocating trimming
blade and press the latter against the side of the slot in the throat plate or against
the fixed blade which is an equivalent for the side of said slot, so as to cause the
cutting edges of the two blades to impinge against each other with the desired
degree of lateral pressure. The blades are thus caused to operate with an
impinging cut, similar to that exerted by one blade of an ordinary pair of shears
against the other. The adjustability of the screw in the arm enables said screw
to keep the impinging pressure of the blades at the required degree and to
compensate for the wear of the proximate sides of said blades. The threads of the
screw and of its socket positively hold the bearing end of the screw in any position
to which the same may be adjusted, so that any desired degree of impinging
pressure of one blade against the other may be produced and maintained
uninterruptedly. The end of the screw may, if desired, be provided with a friction
roller to diminish its friction on the side of the moving cutter. By the provision
of this pressure-regulating device a vertically reciprocating blade is enabled to
operate in connection with a fixed blade with as good results as a pivotted shear
blade arranged somewhat diagonally with relation to its co-operating blade in the
usual manner.
I provide a series of thin plates interposed between the shank of the fixed blade
and the bed of the machine. Said plates are clamped between said parts and held
by an attaching screw. Whenever it is desired to adjust the blade upwardly or
downwardly one or more plates may be removed or inserted as the case may be.
So far as the provision of a device bearing against the movable blade to press it
against the other, the construction, arrangement, and operation of said blades may
be variously modified without departing from the spirit of my invention. The
movable blade may be attached rigidly to a vertically reciprocating knife bar and
move in a rectilinear vertical direction or may be pivotted to a fixed support
attached to the bed of the machine, and connected to said knife bar by a link so
as to be oscillated on its pivot by the needle bar like an ordinary shear blade.
When the movable blade is pivotted to a fixed support its shank should be
curved upwardly to form an arm to which the link is pivotted. Said link is also
pivotted to the vertically reciprocating knife bar, and constitutes a desirable and
comparatively frictionless connection between the knife bar and knife oscillating
the latter by the vertical movements of the former without the friction which
would be involved by the employment of a stud on the knife bar working in a
lot in the knife.
The movable blade when affixed to the knife bar has a recess or aperture
adapted to coincide with the eye of the needle and enable the latter to be
onveniently threaded.
A folder is attached to the ordinary presser foot in position to act as a substitute
for the auxiliary presser foot. Said folder consists of a U shaped plate one arm
of which has an off set attached to the presser foot while the other arm extends
over the red of the machine, the head of the plate being at the left hand of the

page_text: operator. A folding blade is pivotted to a bracket or plate secured to the bed of
the machine and located slightly in advance of the folder. This blade is at such a
'height above the bed of the machine that when the presser foot is depressed to
bear on the work the blade is opposite the centre of the space between the arms
of the folder, the folder and guide together constituting an overseaming attachment
adapted to fold the work. The lower arm of the folder is over the forward end of
the elongated feed dog and therefore acts to press the material down upon said
dog, and is an auxiliary presser. The pivotted blade can be turned out of
the way when it is not required.
The part of the feed dog back of the needle is made wider than the forward
portion, and to accommodate this peculiarly formed elongated feed dog the throat
plate has to be correspondingly slotted so that the throat plate is almost entirely
cut away back of the needle hole. To support the narrow portion of the throat
plate containing the needle hole I provide a bridge attached to the under side of
the throat plate and projecting under the part containing the needle hole. The
upper side of the bridge is recessed to afford room for the feed dog.
A blower casing is attached to the arm of the machine and containing a rotary
blower attached in this instance to the needle bar operating shaft. From the
casing extends a pipe to a point in close proximity to the trimmer. A continuous
blast of air is thus supplied which blows away the shreds and cuttings formed by
the trimmer. The blower may be placed on a separate shaft belted to the driving
shaft if a more rapid motion of the blower is desired

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Robert Lake in the Great Seal Patent Office on the
2nd November 1883..
WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, and Co Patent Agents,
Southampton Buildings, London "IMPROVEMENTS IN AND RELATING TO SEWING
MACHINES A communication to me from abroad by Thomas Crocker Robinson,
of Boston, and Ebenezer Baker Welch of Cambridge, both in Massachusetts, United
States of America.
This invention relates to sewing machines and has for one of its objects to
provide certain improvements whereby bindings may be secured to corsets and
other articles, and the material to which the binding is being attached may be
trimmed, if desired, simultaneously with the attachment of the binding.
It has also for one of its objects to provide certain improvements in sewing
machine trimmer attachments employing a fixed blade and a reciprocating blade in
rubbing contact with the fixed blade, whereby the desired, degree of impinging
pressure of one blade against the other may be maintained and the wear of the
said blades compensated for. Also to provide an improved folder attachment, and
a blower adapted to remove scraps and cuttings: improved means for operating a
pivotted trimming or shearing knife by a vertically reciprocating knife bar and
certain other details of construction. The said invention consists in various
improvements hereinafter described.
In the accompanying drawings
Figure 1 represents a side view of the arm and head of a sewing machine to
which the present improvements are applied.
Figure 2 is an end view of the same.
Figure 3 is a section on the line ax Figure 2 drawn to an enlarged scale.
Figure 4 is a sectional elevation also drawn to an enlarged scale looking from the
inner side of the head.
Figures 5 and 6 are views illustrating a modification.
Figure 7 is a top view or plan of a portion of the bed of the machine showing the .
positions of the binder with relation to the needle, feed dog, and trimmer
Figures 8 and 9 are views illustrating another modification
Figure 10 shows an elevation of the head and a section of a portion of the bed
of a sewing machine embodying some of the present improvements
Figure 11 is a transverse section of the arm, a view of the inner side of the head,
and a section of a portion of the bed of the machine.
Figures 12 and 13 are elevations of portions of a sewing machine, showing a
pivotted cutting blade and its connection to the knife bar.
Figure 14 is a top view of a part of the bed.
Figure 15 is a top view of the throat plate. and
Figure 16 is a section on the line y y, Figure 15.
Similar letters of reference indicate corresponding parts throughout the drawings
Referring first to Figures 1 to 9 A indicates the arm of a sewing machine.
B the needle bar and C the presser bar having the presser foot C¹ located in the
usual relation to the needle B¹.
D indicates a binder of any suitable construction (excepting as to the guard
bereinafter described) arranged to fold a strip of binding over, the edge of a corset
or other article in advance of the needle. E indicates an auxiliary presser foot
(preferably a roll presser) located in advance of the usual presser foot c¹ that is to
Bay between the latter and the operator. The auxiliary foot may be supported by

page_text: In
the presser bar C¹ as shown in Figures 2, 3, 4, 5 and 6 or by an independent bar E¹
as shown in Figures 8 and 9, and when supported by the former the auxiliary foot
is journalled on an arm E3 which is adapted to be swung upwardly on pivots as
shown in Figures 3 and 6, so as to displace the auxiliary foot when desired. In
all cases the auxiliary foot is adapted to yield upwardly independently of the
foot C so that when the narrow parts of extra thickness, such as the bones or
stiffening strips inserted in a corset, pass under the presser foot each foot can yield
independently to such extra thickness, so that the bearing of the other foot on a
part of the article of lesser thickness will not be effected.. The yielding movement
of the ordinary presser foot is effected in the usual manner, the presser bar C being
held downwardly with a yielding pressure by a spring F. The yielding movement
of the auxiliary presser foot may be effected by several different means.
Figures 1, 2, 3 and 4 the arm E' is pivotted to ears K K on a sleeve G (see
Figure 8) which is adapted to slide vertically on the presser bar C, and is pressed
downwardly by the spring F. In Figures 5 and 6 the said arm E' is pivotted at I
to a plate J which is pivotted to ears K on a collar rigidly attached to the presser
bar the pivot I enabling the arm E³ to oscillate vertically between stops L L on
the plate J. A spring M attached to the plate J and bearing at its free end on a
pin N on the arm E³, presses the said arm and presser foot downwardly. When
the auxiliary presser foot is attached to an independent bar as shown in Figures 8
and 9 the said bar is adapted to slide vertically, and is pressed downwardly by a
spring like the bar C. The feed dog P is elongated so as to cooperate with both
presser feet, as clearly shown in Figures 6 and 8.
In advance of the rear or delivering.end of the binder, the throat plate of the
machine is raised as shown at R, the forward end of the feed dog being
correspondingly raised. This raised portion raises the material in advance of the
point where the folded binding is presented to it, and prevents the inclined side 2
of the binder (see Figure 7) from crowding the. material laterally away from the
binder. The raised throat plate R includes the slot S, through which the vertically
reciprocating trimming knife T hereinafter described, passes in making its cut.
The elevated position of the slot S due to the raised throat R, enables the knife
to properly perform its work without interfering with the mechanism below the
bed or work support of the machine
T indicates the trimming knife which is reciprocated vertically over the slot S,
its cutting edge passing through the said slot. The knife is shown in Figures 8
and 9 as attached to an arm or bracket T' which is clamped by a set screw U to a
knife bar V. The bar V'is vertically reciprocated by a suitable connection with
the sewing machine. The adjustable bracket T¹ enables the cutting edge of the
knife to be adjusted laterally, so that, when it is desired to change the throat
plate for one having its slots S at a greater or less distance from the needle to
vary the distance between the trimming edge and the line of stitches, the knife
can be adjusted to correspond with the slot in the throat plate. In any throat
plate that may be employed, care should be taken to make the slot at such an angle
that the knife when adjusted to the slot will work with an impinging cut against
the inner edge of the slot in making its downward movement, like one blade of a
pair of shears against the other. The said bracket also enables a knife with a
straight shank to be employed, and constitutes a convenient means for properly
off-setting the straight knife from the knife bar V, and locating the said knife
sufficiently far in advance of the needle to admit of the interposition of the folder
between the knife and needle.
It will be seen that the two presser feet have independently yielding movements
and in conjunction with the elongated feed dog, furnish an extended bearing for
work varying in thickness, and hold the same either for the binder, or for the
trimmer, or for both, making the operation of each of the said attachments more
satisfactory than would be the case if only the ordinary presser foot were
employed. In Figures 1, 2, 4. 5 and 6 the knife T is shown as attached directly
to the knife bar Ỷ the latter being. located farther forward than in figures 8 and 9

page_text: Bo that the bracket T is not required. In this instance the knife bar is operated
by a connection with the driving shaft W of the machine, viz:-a positively
operating or grooved cam W2 on the shaft W and a bell crank lever W³ pivotted
at W to a bracket on the arm of the machine and engaged with the cam W' at
one end by a pin passing through a slot W8 in the arm of the machine, and
connected at the other end by a set screw W with the knife bar V. The said set
screw passes through a block We fitted to slide in a slot in the lever W³ and
enters a block W7 having a socket through which the knife bar passes. By
loosening the said screw the knife bar is released from the block W7 and the
arm Ws
I do not limit myself to the employment of the holder and trimmer, or either of
them, in connection with the two presser feet, as the said feet arranged and
operating as described perform a useful function in holding down work of uneven
thickness for the action of the needle. Nor do I limit myself to the simultaneous
employment of the binder and trimmer, as either may be used without the other.
When the binder and trimmer are both used the latter trims the edge of the
material before it receives the binding. The machine is provided with a guard or
flange Z (Figures 1. 6 and 7) which is interposed between the receiving end of the
binder and trimmer, and prevents the cuttings removed by the trimmer from
entering the binder.
Referring to Figures 10 to 16 inclusive g indicates a downwardly projecting arm
attached rigidly to the head A of the machine, and having in its lower end a
screw h held in a threaded orifice in said arm, and adapted to bear at one end
against the side of the reciprocating trimming blade T and press the latter against
the side of the slot in the throat plate, or against the fixed blade a, which is an
equivalent for the side of said slot, so as to cause the cutting edges of the two
blades to impinge against each other with the desired degree of lateral pressure.
The blades are thus caused to operate with an impinging cut, similar to that
exerted by one blade of an ordinary pair of shears against the other. The
adjustability of the screw h, in the arm g enables the said screw to keep the impinging
pressure of the blades at a required degree, and to compensate for the wear of the
proximate sides of the said blades. The threads of the screw and of its socket
positively hold the bearing end of the screw in any position to which the same
may be adjusted, so that any desired degree of impinging pressure of one blade
against the other may be produced and maintained uninterruptedly. The end of
the screw may if desired be provided with a friction roller to diminish its friction
on the side of the moving cutter. By the provision of this pressure regulating
device a vertically reciprocating blade, such as is shown in Figures 10 and 11, is
enabled to operate in connection with a fixed blade with as good results as a
pivotted sheer blade arranged somewhat diagonally with relation to its cooperating
blade in the usual manner.
i indicates a series of thin plates interposed between the shanks a¹ of the fixed
blade a and the bed of the machine. The blades are clamped between the said
parts and held by the attaching screw j. Whenever it is desired to adjust the
blade a upwardly or downwardly, one or more plates i may be removed or inserted
as the case may be,
So far as regards the provision of a device bearing against the movable blade to
press it against the other, the construction, arrangement and operation of the said
blades may be variously modified without departing from the nature of this
invention
The movable blade T may be attached rigidly to a vertically reciprocating knife
bar V, as shown in Figures 10 and 11, and move in a rectilinear vertical direction,
or it may be pivotted at d to a fixed support attached to the bed of the machine,
and connected to the said knife bar by a link e as shown in Figures 12 and 13 so
as to be oscillated on its pivot by the needle bar like an ordinary shear blade.
When the movable blade T is pivotted to a fixed support as shown in Figures 12

page_text: and 13, its shank should be curved upwardly to form an arm b¹ to which the
link e is pivotted at 8. The said link is also pivotted at 8' to the vertically
reciprocating knife bar, and constitutes a desirable and comparatively frictionless
connection between the knife bar and knife, oscillating the latter by the vertical
movements of the former without the friction which would be involved by the
employment of a stud on the knife bar working in a slot in the knife
The blade T when affixed to the knife bar has a recess or aperture (see Figure 11)
adapted to coincide with the eye of the needle B' and enable the latter to be
conveniently threaded.
indicates a folder attached to the presser foot C in position to act as a
substitute for the auxiliary presser foot E (see Figures 10. 11 and 14). The said
folder consists of a U-shaped plate, one arm of which has an off-set
attached to
the presser foot C, while the other arm extends over the bed of the machine the
head of the plate being at the left hand of the operator.
indicates a folding blade which is pivotted atto a bracket or plate
secured to the bed of the machine, and located slightly in advance of the folder
as shown in Figure 14. The blade is at such a height above the bed of the
machine that when the presser foot C which is shewn in a raised position in
Figure 10 is depressed to bear on the work as shown in figure 10ª, the blade is
opposite the centre of the space between the arms of the folder, the folder and
guide together constituting an overseaming attachment adapted to fold the work.
in the manner shown in Figure 10b.
By reference to Figure 11 it will be seen that the lower arm of the folder is over
the forward end of the elongated feed dog, and therefore acts to press the material
down upon the said dog, and is an auxiliary presser. The pivotted blade 2 can
be turned on its pivot out of the way when it is not required
The part of the feed dog behind the needle is made wider than the forward
portion, and to accomodate this peculiarly formed elongated feed dog the throat
plate has to be correspondingly slotted, as shown in Figure 15, so that the throat
plate is almost entirely cut away behind the needle hole u. To support the narrow
portion of the throat plate containing the needle hole, I provide a bridge v
attached at w to the under side of the throat plate and projecting under the part
containing the needle hole, as shown in Figure 16. The upper side of the bridge v
is recessed at v¹ to afford room for the feed dog.
Referring again to Figure 1 m indicates a blower casing attached to the arm of
the machine, and containing a rotary blower o attached in this instance to the
needle bar operating shaft W. From the casing m extends a pipe p to a point in
close proximity to the trimmer T. A continuous blast of air is thus supplied
which blows away the shreds and cuttings formed by the trimmer. The blower
may be placed on a separate shaft connected by belting to the driving shaft, if a
more rapid motion of the blower is desired.
Having thus fully described the said invention as communicated to me by my
foreign Correspondents and the manner of performing the same I wish it under-
stood that I claim
First. A sewing machine having. two presser feet, one in advance of the other,
each having an independently yielding movement, and an elongated feed dog
adapted to cooperate with both presser feet, as set forth.
Second. A sewing machine having two presser feet, one in advance of the other,
each having an independently yielding movement, an elongated feed dog adapted to
cooperate with both presser feet, and a binder or folder located between the
presser feet, as set-forth.
Third A sewing machine having two presser feet, one in advance of the other,
each having an independently yielding movement, an elongated feed dog adapted
to cooperate with both presser feet, and an automatic trimmer located near the
forward presser foot, as set forth.
Fourth. A sewing machine having two presser feet, one in advance of the other,

page_text: each having an independently yielding movement, an elongated feed dog adapted
to cooperate with both presser feet, a trimmer located near the forward presser
foot, and a binder located between the two presser feet, as set forth.
Fiftb. The combination with the stitch forming mechanism of a sewing machine,
of a binder located in advange of the usual presser foot and needle, a raised
bed in advance of the delivering end of the binder, an auxiliary presser foot to
hold down the material upon the raised bed, and an elongated feed dog adapted to
cooperate with both presser feet and raised at one end to correspond with the
raised bed, as set forth.
Sixth. The combination with the trimmer and the binder, of the guard or
flange Z, whereby the material removed by the trimmer is prevented from entering
the binder, as set forth.
Seventh. In a sewing machine, a straight trimming knife connected to a vertically
reciprocating bar by an adjustable off-set arm or bracket, as shown in Figures 8
and 9 of the drawings, whereby the knife can be adapted to different throat plates,
as set forth.
Eighth. The combination with a slotted throat plate, of a vertically reciprocating
knife bar, a bracket adjustably attached to the said bar, and a straight trimming
knife secured to the said bracket, and thereby off set from the knife bar and
made laterally adjustable with relation to the slot in the throat plate, as set
forth.
Ninth. The combination with a vertically reciprocating trimming knife, of a
raised throat plate containing the entire slot into which the knife passes in its
downward movement, as set forth.
Tenth. In a sewing machine, the combination with a fixed cutting blade and a
reciprocating cutting blade operated by the power of the machine, the said blades
cutting by an impinging pressure of one blade against the other, of an adjustable
device secured to a fixed part of the machine and adapted to bear against the
reciprocating blade, and means for positively securing the said device in any
position to, which it may be adjusted, thereby enabling the said device to exert
and maintain any desired degree of impinging pressure of one blade against the
other, as set forth.
Eleventh. The combination with the fixed blade a and reciprocating blade T, of
the arm g rigidly attached to the head of the machine, and the screw h adjustable
in the said arm and adapted to bear against the side of the reciprocating blade, as
set forth.
Twelfth. In a sewing machine, the combination of the fixed trimming blade
secured to the bed of the machine, the pivotted trimming blade T having the
upwardly projecting arın 6', the vertically reciprocating knife bar V, and the link e
pivotted both to the knife bar and to the arm of the pivotted knife, whereby the
vertical movements of the knife bar are caused to oscillate the pivotted knife, us
set forth.
Thirteenth. The movable blade having an aperture or recess 6' adapted to
coincide with the eye of the needle, as set forth.
Fourteenth. The combination with a sewing machine presser foot, of an over-
hanging folder r attached to the said foot and adapted to serve both as a folder
and as an auxiliary presser, as set forth.
Fifteenth. The combination of the presser foot, the folder r attached thereto,
and the folding blade secured to the bed of the machine, as set forth.
Sixteenth. The folding blade 3 pivotted to the bed of the machine.
Seventeenth. The throat plate cut away in the vicinity of the needle hole, as
shown, and provided with the bridge v, as set forth.
Eighteenth. The combination with the throat plate and trimmer of a sewing,
machine, of a rotary blower operated by the power of the machine, and a pipe
adapted to convey air from the blower to the throat plate, as set forth.

page_text: Nineteenth: The combination with the knife bar V, of the shaft W, the cam W'
on said shaft, and the pivotted bell crank lever engaged with the said cam and
knife bar, as described.
In witness whereof I the said William Robert Lake have hereunto set my hand
and seal this Second day of November in the year of our Lord One thousand
eight hundred and eighty three.