Improvements in Button-hole Attachments for Sewing Machines.
Year: 1887

page_text: Date of Application, 3rd Jan., 1887.
Specification Accepted, 4th Feb., 1887.
COMPLETE SPECIFICATION.
Improvements in Button-hole Attachments for Sewing
Machines.
I, FRANK C. HALL of Philadelphia in the State of Pennsylvania, United States of
America, Gentleman do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
My invention relates to certain improvements in button-hole attachment mechanisms
which are adapted to be applied to an ordinary sewing machine when button-holes
are desired to be formed, and which may be readily removed thereform when other
work is to be done.
To clearly explain the nature of the invention reference is made to the accompanying
drawings in which:-
Fig. 1 is a top plan view illustrating a button-hole attachment for a sewing machine
embodying my invention.
Fig. 2 is an edge view of the same.
Fig. 3 is a plan view, parts being removed.
Fig. 4 is a perspective view of the vibrator, and cloth clamp.
Fig. 5 is a longitudinal section of the same.
Fig. 6 is a top plan view of an attachment in which are embodied modifications of
certain of the parts.
Fig. 7 is an edge view of Fig. 6.
Fig. 8 is a perspective of the shield or cover which is placed over the main operating
parts of the attachments.
Figs. 9, 10, 11, 12, 12ª and 13 are detail views, and will be more particularly referred
to hereinafter.
The base plate upon which the mechanism of the attachment is supported is
represented by A, and is adapted to be secured to an ordinary throat plate a, or
shuttle plate whereby it may be secured upon the bed plate of the machine (represented
by dotted lines Fig. 7) in proper position relatively to the needle. This plate A, is
bent along its rear edge to form a vertical flange A¹ which is slotted and cut away in

page_text: a peculiar manner, as will be described, and serves as the support for several parts of
the apparatus.
B represents the main vibrating lever forked at its inner end to engage with a
screw stud or other projection on the needle bar, (see dotted lines Fig. 2) from which
it receives motion, and thence communicates it to all the operative parts of the device.
Lever B may be formed of a single piece, the jaws of the forked end being situated
sufficiently far apart to fit over screws or other projections of any of the various sizes
found upon needle bars of different makes of machines, but I prefer to pivot one of the
jaws to the vibrating lever, to which it may be adjustably secured by a set screw, so
that the distance between the jaws may be varied to fit different sizes of needle bar
screws. Such a form of lever is illustrated in detail in Fig. 10, wherein B represents
an arm pivoted to the lever proper and carrying one of the jaws which form the forked
end of the lever. This lever is pivoted near its outer end to flange A¹ and carries a
spring pawl C projecting downward and engaging with a rachet wheel D, mounted on
a short horizontal shaft d. The pin e upon which the pawl is pivoted is adjustable
in a slot in the vibrating lever whereby it is insured that the pawl shall always have
the proper movement although the attachment be used upon machines the needle bars
of which have throws of different lengths. In Figs. 1, 2, 6 and 7 I have shown the
most simple arrangement of adjustable spring pawl in order not to complicate said
figures more than necessary. In Fig. 12 however I have shown in detail the arrange-
ment of devices which I prefer to use. In said Fig. 12 the spring pawl C is carried
by a lever C fulcrumed at small c¹ to the vertical flange or standard A and slotted at
small to receive the pin c or the disengaging side block (Fig. 12). This lever
carrying the pin or block regulates the movement of the pawl and more certainly
ensures its proper engagement with the ratchet wheel D than were it not employed.
Both vibrating lever B and lever being slotted and the pin c or the disengaging
slide block c being movable in said slots, permits the adjustment of the throw of the
pawl as above described, and as will be understood without further explanation. The
shaft lies in a plane at right angles to the flange A and is parallel with the base
plate A, and it may be journaled at one end in the flange A', and at its opposite end
in a standard rising from the base plate, or it may be entirely supported by a
standard rising from the base A, and having a long bearing. Upon this shaft is
mounted the star-wheel or star-wheels which give the reciprocating motion to the
vibrator.
I will now describe this vibrator and also the cloth clamp, which is carried thereby
and has also a sliding movement therein.
The vibrator consists of two plates F, F, the latter covering the former as shown
in Figure 1, and both fulcrumed upon a hollow post, rising from the bed plate whereon
they are confined by a flat headed screw. The lower plate F, is the smaller of the two
and is near its outer end extended beyond the plate F, and formed with inclined faces
which are acted upon by the arms or rays of the star wheel or wheels on the shaft d.
The upper plate F is forked at its inner end to receive the sliding cloth clamp, and at
its outer end rests upon the plate F. In Figure 7, the fingers of the forked part of
plate F, are bent downward as they leave the main portion of the plate so that the
under faces thereof and the under face of the plate F, shall lie in substantially the
same horizontal plane, directly upon the base plate.
The positions of the lower plate F, are determined by the rays of the star wheel
projecting from the shaft d, which, alternately acting upon the plate F, give it a
vibratory motion; but the upper plate F¹, which is secured to and moves with the
lower plate is adjustable relatively thereto around its fulcrum, whereby the position
of the cloth clamp carried by plate F, relative to the needle hole, through the base
plate, may be regulated: The two plates F and F¹, may be secured together and
adjusted as just described in any desired or usual manner, but I prefer to unite them in
the manner shown by means of screws G, passing through slots in the upper plate into
threaded apertures in the plate below. I have found that it is best to interpose a
spring or other elastic agent between said plates F, F¹, or between the heads of the

page_text: screws, and plate F, and hence pass screws w, through elastic or spring plates or
disks G, upon which bear the heads of the screws.
I do not wish to be limited to the employment of three screws-as shown-for
uniting the two parts of the vibrator, as a single one might be successfully used, but
the arrangement which I have shown is the one which I consider most advantageous,
nor do I wish to be limited to the interposition of a spring as described, as that might
be dispensed with.
The sliding cloth clamp (Figures 4 and 5) consists essentially of three plates H, H', H²,
they being superposed and each provided with a quadrangular opening whereby the
necessary movements around the needle to form the button-hole are permitted.
The lower plate H, is fitted to slide in grooves formed therefor in the inner faces of
the arms, which are made to spring inward slightly in order to securely hold the
clamp base H. The other two plates are carried by this lower plate to which they
are riveted near their outer ends, their inner ends being free in order to permit their
being raised to allow the cloth to pass between them and the lower plate. The edges
of the intermediate plate H', are turned downward and serrated as at ', at the ends as
well as at the sides, so that when plate H, is forced down upon the cloth it shall be
securely held against slipping. In addition to the serrated edges h¹, this plate is
provided with downward projecting flanges (Figure 5), at the ends of the quadran-
gular opening therein, these flanges operating when the plate is forced down to stretch
the cloth in the direction of the lengths of the button hole. The upper plate H², is
provided with flanges ², similar to flanges, except that they are formed along the
edges or lower sides of the opening in the plate and serve to stretch the cloth in the
direction opposite to that in which do flanges .
The rear ends of the plates H1, H2, are forked, one of the forked ends of the inter-
mediate plate H, projecting beyond the superposed plate H².
H³, is a spring, held in place by a screw, and bearing upon the forked arms of
the upper and intermediate plates to lift their outer ends upward so that the cloth
may be easily inserted between these plates and the lower plate H.
After the cloth has been properly placed between the members of the clam, the two
upper members thereof are forced downward by means of a cam lever I, pivoted upon
a post I, rising from lower plate H, and carrying an operating handle 1', thus gripping
the cloth. The cam lever has several cams, the first cam i, situated under the
handle I, operates upon the upper face of plate H², to the left hand side of the post 1²;
the second, situated at right angles to cam i-works upon the upper face of plato H³,
in front of the post, and the third cam, situated opposite cam i, upon the upper face
of the intermediate plate H¹. The engagement of these cams with the plates as thus
set forth results in forcing them downward upon the cloth. Both plates Hand H,
are perforated to permit the passage of post I, but the aperture in the upper plate is
the larger of the two so as to permit the working of the cam, therein without inter-
ference, until the jaws or plates H1, H2, have been brought down close upon the cloth,
when the cam, comes in contact with the rear wall of the aperture, and thus serves
as a stop to limit the movement of the cams at the proper point. By preference the
cam faces are so related that the intermediate plate is first brought down upon the
cloth, holding it in place and stretching it in the direction of the length of the button-
hole, after which the outer plate H2, comes down and stretches the cloth in the opposite
direction.
.
Carried by the vibrator and secured thereto is a spring presser foot J, adapted to
bear upon the cloth through the rectangular slots in the cloth clamp plates. It is
slotted as at, to permit the passage of the needle and carries two small rollers j, j
the axes of which are at right angles to the line of travel of the cloth clamp, as it
moves relatively to the vibrator, thus reducing friction. These rollers are transversely
corrugated or grooved, (see Figure 1,) so as furnish a direct bearing in the center and
on both sides of the button-hole, and are situated, one on either side of slot j'. In
order to force this presser foot down upon the cloth, I remove the ordinary presser
foot from the presser bar, and attach thereto in the manner in which quilters are

page_text: ordinarily attached to sewing machines, a short bar or arm J, (Figure 2) carrying
at its lower end a roller J³, adapted to bear upon the plate of the spring presser
foot J. and force it down until the rollers j, come in contact with the cloth. In
place of this arrangement, the presser foot may carry a rest. J', (Figures 4, 5 and 7)
upon which the end of the presser bar is adapted to rest, and when brought down,
to force the rollers into contact with the cloth.
E, represents the aforesaid star wheel mounted upon the shaft. d. The rays e, of this
wheel are bent alternately in opposite directions, so that one half of the rays lie to one
side of the central line of the wheel and the other half to the other side.
The number of teeth on the ratchet wheel is such that one of the arms or rays e,
is made to engage with and move the vibrator at each reciprocation of the
needle bar.
This same result of oscillating the vibrator by means of a star wheel, can be effected
in different ways, one being illustrated in Figures 6 and 7, wherein two star wheels
are employed, the number of rays on the two wheels being equal to the number of rays
on the single wheel of the character first described, the rays on one wheel being
arranged alternately with those of the other. In such construction it will be understood
that the rays of the wheels need not be bent out of the plane of the wheel, and that
the inclined faces with which they engage will be arranged to correspond with their
position.
But this
Another construction is illustrated in Figure 11, wherein the rays e of a star-wheel
act successively upon opposite sides of a tappet E, pivoted to the base plate and having
an outwardly projecting pin which enters an aperture in the lower plate F.
device need not be described in detail as it is simply shown to illustrate one of the
different constructions in connection with which the star-wheel may be employed to
reciprocate the vibrator.
I will now describe the mechanism whereby the forward and back movement is given
to the cloth clamp in order to form the line of stitches on each side of the button-hole.
The outer end of the lever B, is made in the form of a bell crank, the lower or
downwardly projecting arm being formed with two jaws between which extends one
end of a bell crank lever L, fulerumed upon the base plate at 1, and carrying at its
opposite end a pivoted dog M.
One of the jaws K, which engages with the end of lever L, is adjustable as shewn in
Figure 10, whereby the length of stroke or oscillation of the bell crank L, at each
vibration of the lever B, may be varied, for it will be seen that a greater motion will
be imparted to the lever L, when the two jaws are close together, than when the jaw K,
is moved away from the stationary one.
I do not wish to limit myself to the means just described for connecting the
levers B and L, as a like adjustable movement may be imparted to the lever L, by
means of a bell crank lever K', (see Figure 7.) pivoted to the vertical flange A', and
receiving motion from a pin or sind 4, carried by the lever B. The horizontal arm of
the bell crank K, and the lever B, are both slotted, and the connecting pink, is
adjustable in said slots, whereby the movement of the lever K¹, and in turn, of the
lever L, which engages with the forked end of the vertical arm of the lever K, may be
varied, as will be seen without further explanation. N, is a ratchet wheel turning
freely on a stud n, rising from the base plate, and with which engages the dog M,
carried by the lever L, thus causing said wheel to turn as the levers L, and B, oscillate.
Secured to or formed with this ratchet wheel N, is a small pinion N1, with which
pinion meshes a larger gear wheel 0, turning on a hollow post o, there being a collar
or annular plate surrounding the post o, to raise the wheel O, the proper height above
the bed plate to mesh with the pinion N'.
This wheel O, has secured to, and moving with it, the feed cam 0¹, and pattern
wheel or cam 02, (Figure 13) the feed cam resting on the gear wheel, and the pattern
cam on the feed cam, and both surrounding the post.o.
P, is a sliding yoke fitting over the cam 01, and moved thereby, it being guided in
its movements by the stationary stud n, and another stationary stud p, which studs

page_text: extend into slots formed in the opposite arms of the yoke. And it will be seen without
further explanation that at each revolution of the cam the yoke will be reciprocated.
At its outer end the yoke carries a pin 1 projecting through a slot in a plate Q,
pivoted at 9: to the base plate A, this plate Q, being in turn connected by a link R,
with the sliding cloth clamp.
As will be seen without further explanation, at each revolution of the wheel Q, and
the yoke P, the pivoted plate Q, the link R, and the cloth clamp, are each moved once
forward and back, thus carrying the fabric under the needle to form the two rows, of
stitches, one on either side of the bution-hole.
:
In order to adjust the distance which the cloth clamp shall slide, and thus regulate
the size of the button-hole, I slot the plate Q, as at 7, and mount the outer end of the
link R, in a slotted plate Q, (Figures 1 and 6.) adapted to be secured to the plate in
various positions by a set screw. Thus by moving the end of the link R, to and from
the fulcrum of the plate Q, and there securing it, the movement of the clamp is varied
to correspond to the length of the button-hole.
I will now describe the devices whereby the motions of the parts are so regulated
that a row of stitches shall be formed down one side, across the end, up the other side,
and across the other end of the button-hole, at each revolution of wheel O.:
This movement is insured by the pattern wheel 0, the periphery of which is formed
of two parts o, o², (see Figure 13.) the latter of which is struck in the center of the
post o, with a greater radius than is the part o'. These parts of, o², are of slightly
unequal lengths, the portion o¹, being longer than the part of, so that there is a small
portion of this wheel whereon diametrically opposite points are both upon the portion
of the wheel having the smaller radius.
S, is a sliding yoke having bearing points ss, adapted to engage with the opposite
faces on the periphery of the pattern wheel. The distance between these poins may be
and preferably is, somewhat greater than the diameter of the wheel on any line, or they
may fit the periphery thereof quite closely-except when they are both upon the part o
This yoke near the end opposite that which engages with the pattern wheel is slotted
to fit over a pin T, rising from the plate F, and is provided at the end with a projec-
tion 3, which passes through an aperture in the flange or standard A', whịch assist in
properly guiding the movement of the yoke.
:
The arrangement of these parts is such that when the forward motion of the slide of
the cloth clamp begins, one of the points s, begins its contact with the portion o²; of
the pattern wheel, the other point engaging with the part o. When the wheel has
made about a half revolution, the point which had, during the inward movement of the
cloth clamp, been engaging with the portion o², of the pattern wheel, escapes there-
from, both points, then engaging with opposite parts of the portion of the wheel.
This permits a much longer oscillation of the cloth clamp which accomplishes barring
at the end of the button-hole.
The further revolution of wheel .o, reverses the position of the cloth clamp, and
brings the opposite points, in contact with the portion o², of the periphery of the
pattern wheel, again limiting the movement of the vibrator, but in this case so limiting
its movement that the stitches formed shall be laid on a different line from that
followed during the other movement of the cloth clamp, and upon the opposite side of
the button-hole.
The points at which this pattern cam, through the yoke plate S, shall limit the
movements of the vibrator, may be varied, and I have shown several ways for doing
this. Referring to Figure 3,,, represent blocks adjustably secured to the under
side of yoke S, by set screws and carrying the bearing points s. By separating these
blocks the oscillation of the vibrator before being arrested by one points, coming in
contact with the periphery of wheel O2, will be lengthened, and hence the width of the
double row of stitches on either side of the button-hole will be greater than if the
blocks s, and points s, were closer together. The same end may be accomplished by
having the points stationary and placing movable blocks. S², in the aperture through
which projects the pin T.

page_text: While I have illustrated both these means of adjustment as applied to a single
yoke S, it will of course be understood that where one is employed the other will be
omitted both being shown on one yoke plate simply for the sake of illustration.
A further adjustment of the throw of the vibrator is provided for by slotting the
plate of the vibrator, and seating therein a squared portion of the stud T, which
slides back and forth in the slot.
Engaging with this pin T, is a forked shipping lever U, adapted to move the pin T,
from one position to another in the slot t, in the vibrator as desired, and having an
operating handle projecting through flange A', where it may be conveniently reached
and worked when the attachment is covered by shield X, Figure 8.
V, is a small pinion (Figures 2 and 7,) engaging with the gear wheel O, it being
mounted upon a vertical shaft. V, supported in a bracket e, upon the base plate. The
shaft V, is provided at its upper end with a milled head whereby the shaft is adapted
to be turned by the operator and hence the position of the wheel O, and the parts regu-
lated thereby changed to any desired position. This permits the parts to be set as the
work in hand may require.
W, is a flat metallic bow-spring bearing at once upon the yokes S and P. By
means of a binding screw, engaging with the hollow post o, this spring may be
made to bear against the said yokes whereby the tension of the mechanism may be
accurately regulated.
The main operative parts of the mechanism are covered by means of a shield X,
having an opening, to permit the shaft V, and the milled wheel ², to project á
sufficient distance through the same to be easily operated. There is also a compara-
tively larger opening through which the binding screw which unites the pivoted
plate Q, and the slotted plate Q, may be operated in order to change the distance
which the sliding cloth clamp shall move to adjust the length of the movement of the
cloth clamp to suit the size of the button-hole. This shield is provided at its edges with
dovetail shaped projections, which are adapted to correspondingly shaped recesses
formed in the base plate A, and flange A', whereby it is securely held in place, it being
screwed to the flange A', or to base plate A, as at X, and secured in any other desired
or necessary manner.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :—
1. In combination with a sewing machine attachment, and the needle bar of a sewing
machine, a vibrating lever which receives motion from the needle bar and transmits it
to the attachment, having a forked end which engages with a projection on the needle
bar, and means for adjusting the jaws of the forked end of the lever toward and from
each other, substantially as and for the purpose set forth.
2. In an attachment for a sewing machine, the combination with a vibrating cloth
clamp, of a vibrating lever operated by the needle bar, a shaft adapted to be rotated
by said lever, and a star wheel mounted on said shaft and engaging with the vibrator
to move it, substantially as described.
3. In an attachment for a sewing machine, the combination with a vibrating cloth
clamp, of a vibrating lever operated by the needle bar, a shaft d, an adjustable spring
pawl carried by the said lever for rotating said shaft, and a series of alternately
arranged rays projecting from said shaft and adapted to engage with the vibrator andl
to oscillate the same, substantially as described.
4. In an attachment for a sewing machine, the combination of a vibrator consisting
of two parts, one of which carries the cloth clamp, mechanism engaging with the other
part of the vibrator to oscillate it, and means for adjustably connecting the part of the
vibrator carrying the cloth clamp with the other part, substantially as and for the
purpose set forth.
5. In a button-hole attachment for a sewing machine, the combination of a vibrator
having the lower plate F, and the upper plate F, both fulcrumed at the cloth clamp

page_text: carried by the plate F¹, means engaging with the plate F, for oscillating the vibrator,
and devices adjustably connecting the two plates, substantially as described.
6. In a button-hole attachment for a sewing machine, the combination with a
vibrator consisting of two parts adjustable relatively to each other, the cloth clamp
carried thereby, a spring interposed between or mounted on the two parts of the
vibrator, and means for moving the vibrator, substantially as described.
7. In a button-hole attachment for a sewing machine, the combination of a vibrator,
mechanism for moving the same, and a sliding cloth clamp, consisting of the lower
plate H, and the two superposed plates H1, H2, secured to said lower plate, substantially
as and for the purpose set forth.
8. In a button-hole attachment for a sewing machine, the combination of a vibrator,,
mechanism for moving the same, and a sliding cloth clamp having a lower plate, a
plate provided with serrated sides and ends, and another plate having the flanges h²,
and a device for forcing the last of said plates down upon the lower plate, substantially
as described.
9. In a cloth clamp for a button-hole attachment for a sewing machine, the combina-
tion with the lower plate upon which the cloth rests, having a quadrangular opening
in which the button-hole is formed, of an upper plate having at the ends of said
opening downwardly projecting flanges, and means for forcing said upper plate down
upon the cloth resting on the lower plate, the said flanges operating to stretch the
cloth in the direction of the length of the button-hole, substantially as and for the pur-
pose set forth.
10. In a sliding cloth clamp of a button-hole attachment for a sewing machine, the
combination of the lower plate, an upper plate secured thereto, a spring bearing upon
said upper plate to force its cloth-engaging portion away from the lower plate, and a
device for foreing said upper plate into contact with the cloth, substantially as
described.
11. In a sliding cloth clamp of a button-hole attachment for a sewing machine, the
combination of the lower plate, two superposed plates secured thereto, a spring bearing
against said superposed plates to force the cloth engaging portions away from the
lower plate, and a device for forcing said superposed plates into contact with the cloth,
against the action of said spring, substantially as and for the purpose set forth.
12. In a sliding cloth clamp of a button-hole attachment for a sewing machine, the
combination of a lower plate, two upper plates, and a cam having faces which bear
against both of said upper plates, whereby they may be separately brought into contact
with the cloth, substantially as set forth.
13. In a button-hole attachment for a sewing machine, the combination of a cloth
clamp having an opening in which the needle works to form the button-hole,
mechanism for moving said clamp, and a presser foot passing through said opening
and bearing upon the cloth in proximity to the needle, substantially as set forth.
14. In a button-hole attachment for a sewing machine, the combination of a
vibrator, a cloth clamp, a spring presser foot secured to and carried by the vibrator
and adapted to engage with the cloth in proximity to the needle, and the presser bar
of the sewing machine adapted to force said presser foot down, substantially as set
forth.
15. In a button-hole attachment for a sewing machine, the combination of a
vibrator, a cloth clamp, a spring presser foot carried by the vibrator, and an arm
carried by the presser bar and having a roller at its lower end which when brought
down bears upon the spring presser foot, and forces it into contact with the cloth,
substantially as described.
16. In a button-hole attachment for a sewing machine, the combination of a
vibrator, a sliding cloth clamp, and a pressure foot carried by the vibrator, having a
slot, for the passage of the needle, and provided with rollers adapted to engage with

page_text: the cloth to hold it firmly upon the base plate near to the needle, and having the axis
of the rollers at right angles to the line of travel of the cloth as it is moved by the
cloth clamp substantially as set forth.
17. In a button-hole attachment for a sewing machine, the combination of the
vibrating lever B, bell crank lever L, an adjustable connection substantially of the
character described between the levers B and L, the dog M, a ratchet wheel driven by
said dog, a feed cam intermediately driven by said ratchet wheel, the sliding clothi
clamp, and mechanism interposed between the cloth clamp and feed cam, substantially
as described.
18. In a button-hole attachment for a sewing-machine, the combination of a feed
cam, mechanism for operating it, a yoke engaging with said cam, a pivoted plate
operated by said yoke, a sliding cloth clamp, and a link connecting said plate with the
cloth clamp, substantially as described.
19. In a button-hole attachment for a sewing machine, the combination of a feed
cam, mechanism for operating it, a pivoted plate Q, connected with and operated by
said cam, having the slot 7, the slotted plate Q¹, secured to plate Q, a sliding cloth
clamp, and a link connecting the cloth clamp with said pivoted plate, it having one end
engaging with said plate Q, and entering the slot q, whereby the slide of the cloth
clamp may be varied to suit the size of the button-hole being formed, substantially as
described.
20. In a button-hole attachment for a sewing machine, the combination of the
vibrator, the cloth clamp, mechanism for sliding the cloth clamp, a single pattern
wheel having its periphery formed of two parts of different radii, and a yoke engaging
with said pattern wheel and connected with the vibrator, whereby its movements
are regulated to properly lay the stitches to form the button-hole, substantially as
described.
21. In a button-hole attachment for a sewing machine, the combination of the
vibrator, the cloth clamp, mechanism for sliding cloth clamp, a single pattern wheel
having its periphery formed of two parts o², o², struck with different radii, the portion
struck with the shorter radius being the longer, and a yoke having the engaging
points s, and connected with the vibrator, substantially as and for the purpose set
forth.
22. In a button-hole attachment for a sewing machine, the combination of the
vibrator, mechanism for oscillating the vibrator, a pattern wheel, a yoke engaging
with said pattern wheel and connecting it with the vibrator, and means substantially
as described for adjusting the positions at which the pattern wheel shall arrest the
movements of the vibrator, substantially as described.
23. In a button-hole attachment for a sewing machine, the combination of the
vibrator, mechanism for oscillating the vibrator, a pattern wheel, a yoke engaging
with said pattern wheel and connecting it. with the vibrator, and adjustable blocks s
carrying bearing points s, which engage with the periphery of the pattern wheel,
substantially as described.
24. In a button-hole attachment for a sewing machine, the combination of a
vibrator, the cloth clamp, mechanism for sliding the cloth clamp, a pattern wheel,
a yoke engaging with said wheel, a pin whereby said yoke is connected with, the
vibrator, and means for adjusting the said pin-upon the vibrator, substantially as set
forth.
25. In a button-hole attachment for a sewing machine, the combination of the
vibrator, the sliding cloth clamp, the wheel O, feed cam 01, and pattern wheel 02,
all operating around the same centre, and moving together, mechanism for moving
said parts 0, 0, 0, mechanism connecting the feed cam with the cloth clamp, and
mechanism connecting the pattern wheel with the vibrator, substantially as described.
26. In a button-hole attachment for a sewing machine, the combination. with the

page_text: feed cam and the pattern wheel, of the yokes which engage therewith, and the spring
bearing upon said yokes whereby the tension of the device may be regulated,
substantially as described.
27. In a button-hole attachment for a sewing machine, the combination of the
sliding cloth clamp, mechanism which moves the same having the gear wheel O, and the
setting device consisting of the pinion V, meshing with wheel O, and the shaft V₁,
whereby the position of the cloth clamp may be conveniently set at any desired time,
substantially as described.
28. In combination with a sewing machine attachment substantially such as herein
described, the shield X, having projections a, adapted to recesses in the base plate of
the attachment, and adapted to be also secured thereto, substantially as and for the
purpose set forth.
29. In an attachment for a sewing machine, the combination with a vibrating cloth
clamp, of a vibrating lever operated by the needle bar, a shaft d, carrying devices for
vibrating the cloth clamp, a ratchet wheel upon said shaft, a spring pawl which engages
with said wheel, and a lever fulcrumed on flange A¹, of the base plate of the attach-
ment, carrying said pawl and receiving motion from the vibrating lever, substantially
as and for the purpose set forth.
30. The combination with a shaft carrying devices for vibrating the cloth clamp, of
a ratchet wheel on said shaft, a pawl carried by a slotted lever fulcrumed on the base
plate, a vibrating lever operated by the needle bar, and a disengaging slide block or
pin connecting said levers, substantially as described.
PHILIP M. JUSTICE,
55 and 56, Chancery Lane, London,
Applicant's Agent.