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Nov. 19, 1946.
A. R. WOOD
2,411,493
BUTTONHOLE SEWING MACHINE
Filed July 15, 1944
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Nov. 19, 1946.
A. R. WOOD
2,411,493
BUTTONHOLE SEWING MACHINE
Filed July 15, 1944
7 Sheets-Sheet 2
NOV. 19, 1946.
R_ WQQD
2,411,493
BUTTONHOLE SEWING MACHINE
Filed July 15, 1944
'7 Sheets-Sheet 3‘
3mm
NOV. 19, 1946.
A_ R_ wQQD
2,411,493
BUTTONHOLE SEWING MACHINE
Filed July 15, - 1944
7 Sheets-Sheet 4
gm if
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3mm
Nov. 19, 1946,
A. R. WOOD
2,411,493
BUTTONHOLE SEWING MACHINE
Filed July 15, 1944
I
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66
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65
109,
'
7 Sheets-Sheet 5
Nov. 19, 1946.
‘A. R. WOOD
‘2,41 1,493
BUTTONHOLE SEWING MACHINE
Filed July 15’, 1944
1"
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7 Sheets-Sheet 6
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0911986? 2 7/0062
Patented Nov. 19, 1946
2,411,493
UNITED STATES PATENT OFFICE
2,411,493
BUTTONHOLE. SEWING MACHINE
Alfred R. Wood, Bridgeport, Conn., assignor to
_The Singer Manufacturing Company, Elizabeth,
N. J., a corporation of New Jersey
Application July 15, 1944, Serial No. 545,035
16 Claims. (0]. 112-73)
,
.
2
1
This invention relates to‘sewing machines and
more particularly to sewing machines of the
straight buttonhole type having mechanism
whereby the length of the stitches is automati
cally increased at the opposite ends of the button
ho-le upon cessation of the feeding movements of
the work-clamp for the purpose of producing
barring stitches.
in section, of a buttonhole sewing machine em
bodying the invention.
Fig. 2 represents a horizontal sectional view
taken along the line 2-2, Fig. 1.
Fig. 3 is a left side elevational view of the ma
chine shown in Fig. 1.
‘
Fig. 4 is a bottom plan view.
‘
Fig. 5 represents an enlarged vertical sectional
In the production of high grade buttonholes
view taken substantially along line 5-5, Fig. 4.
where the barring stitches are desired to be pat 10
Fig. 6 represents a vertical sectional view taken
terned in a neat, closely packed, stacked relation,
substantially along line 6-6, Fig. 4.
it is imperative that the increase in the ampli
Fig. 7 is a top plan View of the bracket-arm
tude of the needle~vibration and the cessation of
of the machine.
the feeding movements of the work-clamp at the
Fig. 8 represents an enlarged vertical sectional
beginning of the barring operation occur simul
view taken substantially along the line 8-8, Fig.
taneously. It is equally important that at the
1, showing some of the detaib of the means em—
ending of the barring operation the amplitude of
ployed for rendering the clutch e?'ective or inef
the needle-vibration decrease at the same time
fective in rotating the feed-cam.
that the feeding movements of the work-clamp
Fig. 9 represents an enlarged vertical sectional
are resumed to form the other side stitches of the
button-hole.
In previous machines of the type in which this
view taken substantially along the line 9-9,
Fig. '7.
Fig. 10 is an enlarged vertical sectional view
invention is embodied, the mechanism employed
for stopping the work-clamp when the barring
taken substantially along the line lll-l0, Fig. 3,
will hereinafter appear,-the invention comprises
the devices, combinations and arrangements of
the needle~bar vibrating mechanism in position
to produce the relatively long barring stitches and
the bar-stitch counting device operating to de
showing the feed-shaft ?tted with the spline hav
stitches were started and for again starting the 25 ing the clutch-releasing cone secured at its lower
work-clamp when the needle-vibration was re
end and the annularly grooved collar secured at
duced to side-stitching length operated satisfacé
its upper end.
torily at slow speeds of stitch-formation. How
Fig. 11 represents a horizontal sectional view
ever, since the speed of operation of the sewing
taken substantially along the line I l—l I, Fig. 10.
30
machine has now been increased as much as ?fty
Fig. 12 is an enlarged fragmentary top plan
per cent, the mechanism of the prior machines
View of the needle-bar vibrating mechanism and
failed to perform its function with the requisite
the bar-stitch counting device, showing the rela
degree of accuracy and particularly at the end
tive position of the component parts thereof when
of the barring operation and at the time that
the machine is producing the side-stitches of the
the amplitude of needle-vibration was reduced 35 buttonhole.
and the feeding movements of the work-clamp
Fig. 13 is a fragmentary top plan view of the
resumed.
bar-stitch counting mechanism and shows the
‘It is the primary object of the present inven
manner in which said mechanism is rendered in
tion to provide a mechanism’ by which the work
effective during the production of the side-stitches
clamp shifting mechanism is instantly rendered 40 of the buttonhole.
ineffective or effective when the amplitude of
Fig. 14 is a view similar to Fig. 12, but with
vibration of the needle is increased to form the
the bar-stitch counting mechanism removed to
barring stitches or decreased to form the side
show more distinctly the details of the needle-bar
stitches of the buttonhole.
vibrating mechanism.
‘
:With the above and other objects in view, as
Fig. 15 is a view similar to Fig. 12, but with
parts hereinafter set forth and illustrated in the
accompanying drawings of a preferred embodi
ment of the invention, from which the several
features of the invention and the advantages
termine the number of stitches comprising the
attained thereby will be readily understood by
tional view taken substantially along the line
those skilled in the art‘.
I6-_|6,Fig. 1.
I In the accompanying drawings,
1
a
Fig. 1 is a right side elevational view, partly
bar.
'
Fig. 16 represents an enlarged horizontal sec
'
< Fig. 17 represents a view, partly in section, taken
along the line l'|—-l1, Fig.1, showing an adjust
2,411,493
3
ment in the connections between the feed-cam
and the work-clamp, whereby the machine can
be set to sew various lengths buttonholes.
Fig. 18 represents an enlarged sectional view
taken along the line i8—l8, Fig. 10.
Fig. 19 represents an enlarged sectional View
taken along the line Iii-l9, Fig. 11.
Fig. 20 represents a top plan view of the feed
and tracks a suitable cam-groove 26 formed in the
feed-cam H.
The feed-cam I‘! is secured to the feed-shaft
I8 to rotate therewith and preferably by means
of a collar 2'l', Figs. 5 and 10, brazed to the shaft
I8 or fixed thereto by set-screws 28 and formed
with a projection 29 provided with a dogging pin
30 adapted to enter a timing hole 3! formed
in the feed-cam I1. The feed-cam I1 is held
against the collar 21 with the dogging pin 30
in the timing hole 3! by a nut 32 threaded upon
the feed-shaft i8. The above described means
frame including a bed I from which rises a
for securing the feed-cam to the feed-shaft is
' standard 2 of the bracket-arm 3 terminating in
desirable for the reason that by removing the
a head 4. Journaled in the bracket-arm 3 is a
vnut 342 the entire feed-cam I1 and its associated
main-shaft 5 connected at its rearward end, by 15 mechanism ‘can be readily removed from the
spur~gears, to a countershaft 6 driven by a, belt
machine without having to withdraw the feed
adapted to run upon a nest of pulleys ‘I carried
shaft or disturb its timing.
by the countershaft 6, see Figs. 1 and 3. Jour
The feed-cam El and the feed-shaft l8 are
cam.
'
Referring to the drawings, the machine chosen
for the purposes of the present disclosure has a
naled within the standardv 2 is a vertical shaft
intermittently rotated by means of a one-way
8 geared at its upper end to the main-shaft 5 20 ac'tingclutch of the Horton type which is actuated
and at its ‘lower end to a 'bed- or hook-shaft 9
by ‘the vertical shaft 8. More ‘specifically, the
journaled in the bed i. Secured at the outer
clutch preferably ‘comprises an outer clutch drum
end of the ‘hook-shaft *9 is a rotary loop-‘taker
33 fixed, as clearly shown in Fig. 10, by a plurality
or hook Iii adapted to cooperate with a thread
of screws 3!! to the recessed under surface of the
25
.ca'rr’ying ‘needle H in ‘the ‘formation ‘of lock
feed-cam ‘ll. Disposed within the clutch-drum
stitches. The needle H is carried by the lower
33 and freely rotatable upon the depending hub
end of a needle-bar 1'2 "journaled ‘for 'en‘dwise
35 (Fig. 10) of the feed-cam IT is a live internal
reciprocatory movement
spaced bearings
clutch-spider 3% formed preferably with three
formed ‘in a vibratory ‘needle-bar-gate "l3 sup 30 suitable cavities 3'! provided with inclined hard
ported upon pintles
Within the head 5. The
erred ware-plates ‘38. Disposed in each of the
needle-bar [2 may derive its reciprocator'y move
ments from the main-shaft '5 by means of any
usual or suitable connections therewith.
cavities 3'! is a clutch-member 39 which is ‘en'
gaged by a plunger All, ‘Fig. 4, backed by a coil
spring 5|, the plunger acting to bias the ‘clutch
‘ The work to be but-tonholed is adapted to be 35 member ‘39 toward ‘the narrow end of the cavity
37 and wedge ‘the same between the inclined
ware-plate 3B and v‘the clutch-surface of vthe
l. The work-clamp vis ‘slowly moved in step-by
drum ‘33. The spider 36 is oscillated constantly
step fashion "under the endwise reciprocatory and
about the axis vof the feed-shaft 18 during the
laterally vibratory needle H, ?rst away from the‘ 40 operation of the machine by means of an arcuate
standard 2 and then towards the standard to
shaped actuating lever 42 secured at its inner end
cause the j?rst and second rows of side zigzag
by ‘screws '43 to the spider 36. At its other
end the actuating lever '62 is connected by a ‘link
stitches't‘o bev laid'side by side in :the work. rl‘he
workecla‘mp derives ‘its step-byestep movements
44 to the outer end of a rock-‘lever 45 carried
from the usual feed-cam ll’, carried on a ver *5 on the lower ‘end of a vertically disposed rock
tically disposed feed-~shaf-t l8 j-ou-rnaled in th
shaft ‘46 (see Fig. l) journaled ‘in a bearing
busliing'll'i ‘pressed into the machine bed vl. At its
bed I and bracket-arm 3 of the machine-frame.
The connections between the work-clarnpand the
upper end the rock-‘shaft v'46 has secured thereto
fe'ed-c'am'are generally similar to the construc
a second rock-lever 48 connected to a pitman
tion disclosed v‘in the U. S.’ patent of E. B. Allen, 1 UV 749, ;Fig. ‘2; one ‘end' of said pitman embracing
No. 785,061, March 14, 1905. Referring to Figs.
an eccentric '59 fast on the vertical shaft ‘8. As
4, '10, '17 and 20 it will ‘be observed that-by-step
the shaft :8 is "rotated, the eccentric'50 imparts to
movementspf the work-clamp away from, and
the rock-‘shaft 46 oscillatory movements ‘which
through the ‘rock-lever ‘"45, link 44 and ‘actuating
back ‘towards the standard »'2 are obtained from
lever 152 oscillate the clutch-spider'ili? about the
aheart-shaped cam-groove i9- formed‘in the up
axis of the ‘feed-shaft 18. The clutch-spider
‘~p'er face vof the ‘feed-cam ’ I‘! ‘through a bell
held in a, workeclarnp comprising the usual ‘lower
work-plate i5 and the upper clamp-foot [6, Fig.
36, through the clutch-members 39, drives ‘the
crank 'l‘ever'2ll, th'e‘IsIo ted limb of which is con
clutch-drum '33 which rotates the feed-cam I1
nected to ‘the work-‘plate "l5 vby a link 2!. To
and feed-shaft 'IB intermittently'in one ‘direction.
ifacili-ta't'e the ‘proper adjustmentof the connec
tions between the feed-cam l1 and thework-clamp 6 ORetrograde motion of the feed-cam H is pre
‘for the production'of a'pred‘etermined length but
'tonhole'ithe {link '12‘: adjacent the slotted ‘limb or
ventediby a common form of dog shown as 51 in
'Fig. 4.
-
‘
The speed with ‘which "the feed-cam I1 ‘is ‘ro
a pointer 22 which extends ‘Ins-Warm through a _ tated is dependent upon the effective length of
The means employed in
‘clearahcey'slot ~23 finfth'e bed {I "of the machine 6 a the actuating ilever
'the "be'lléc'rah'k lever ‘2Q, ~Fig. I7, is formed ‘with
and ‘into ‘register ‘with a suitable indicator-plate
‘24 se'cur'ed'upon'thefbed‘i. The indicia <0n1the
indicator-‘plate denote the various "buttonhole
‘sizes in button ligne‘s. The connections employed
"the machine chosen ‘to illustrate the present in
vention ‘for adjusting the effective length of the V
actuating lever ‘is substantially‘the same as that
‘forming the subject of the United States Patent
for shifting the work-clamp sidewise so that ‘the 7 O'Nov 2L334,'154_ ‘issued to A. R. Wood on November
9, 1943. As ‘shown in Figsxll'and 5, the actuating
two ‘rows-er ‘side stitches of ‘the 'buttonhole ‘may
lever is formed with a longitudinal T-shaped slot
‘be properly spaced are similar ‘to those in __the
52 in which slides a block 53 provided with 'a
above'mentioned Allen patent and ‘comprise 'a
depending ball-like member v54 embraced by *the
connected to the 'work-ip'late l5 while‘theo'ther 75 ‘sockete‘d end‘of'th'e‘link r4. Threadedi-ntoapro
lever 25, Figs. 4 and '10, one end of which is
5
2,411,493
j‘ection 55 on the block 53 is an adjusting rod 56
j'ournaled against endwise movement ina bear
ing member 51 pivotally‘ supported upon the
clutch-spider 36. <When it is desired to change
entire length with a clearance opening or key
way 63 in'which. is disposed within the con?nes
of . thelfeed-shaft- for free endwise movement a
clutch-releasing rod or spline 64, Fig. 10. Se
cured to‘the lower end of the spline ‘64, prefer_
adjusting rod 56 is adapted‘to be turned by a
ably by screws 65, is a clutch-releasing sleeve 66
Suitable wrench in a manner fully disclosed in
slidably mounted upon the feed-shaft l8. The
the above‘mentioned Wood patent. The turning
clutch-‘releasing sleeve 66 adjacent its upper end
of ‘the ‘adjusting rod 56 shifts the block 53 length
is formed with a substantially cone-shaped‘ cam
wise of the actuating arm 42, thereby increasing 10 surface 6‘! which, when the sleeve is elevated to
or decreasing the oscillations imparted to the live
clutch-releasing position, is adapted to engage‘
clutch-spider, ‘whereby the ‘number of stitches
the respective tail portion of each of a plurality
forming the buttonhole can be readily controlled.
of clutch-element-releasing levers 68 journaled
_~ Tojprevent overthrow of the clutch during the
upon pivot-studs 69 depending from the spider
the effective length of the actuating arm 42, the
high‘speed operation of the machine, the feed
cam I‘! has embracing its grooved periphery for
a "major portion thereof a brake (Fig. 4) in the
form of a wire loop 58 secured at one end pref
erably to a lug 59 cast integral with the machine
plate 6 36, causing the clutch-element-releasing
levers to engage the clutch-members 39 and dis
place them to a position such that wedging of
the clutch-members between the spider 36 and
the clutch-drum 33 cannot take place. Obvious
bed I.‘ 'At its other end the wire loop 58 is hooked 20 ly, when the clutch-members 39 are thus main
into'one end of a coil-spring 60 connected at its
tained in‘ non-wedging position, actuation of‘ the
otherend to the free end of a member 6| ad
spider 36 is ine?ective to turn the feed-cam l1.
justably fastened to an extension 62 vfast on the
During the time the feed-cam remains station
rock-lever 45. As the rock-lever 45 is actuated
ary there is no relative feed between the work
toirotate the feed-cam I‘! (see arrow in Fig. 4) 25 clamp and the laterally vibratory needle I l and
the wire loop 58 through the coil-spring 66 is
hence continued vibration of the needle effects .
tightened about the periphery of the feed-cam I‘!
the production of barring stitches arranged in a
to such an extent that at the end of the stroke
of the rock-lever 45, the wire loop is drawn suf?
neat stacked relation. To maintain the compo_
nents of the entire clutch assembly in proper co
ciently tight about the periphery of the feed 30 operating relationship a plurality of retainers ‘Ill
cam to brake the same and preclude any over
are provided (Figs. 4 and 5), which retainersare
throw thereof. During the return stroke of the
fastened by screws ‘H to the live clutch-spider
rock-lever 45, it will ‘be understood that the ten
36. Each of these retainers is formed at its in
. sion applied to the wire loop 53 will be released.
The particular form of brake above described
forms the subject of my co-pending divisional ap
plication Serial No. 599,061, ?led June 12, 1945.
The principal advantage of this type of brake is
that in initially engaging to turn the feed-shaft
l8 the clutch does not have to overcome, in addi
tion to the inertia of the parts, any appreciable
braking force which may be needed at the end
of the feed-cam advancing stroke to-prevent over
throw of the feed-cam. In other WOI‘dS,»Wlth the
improved wire-loop brake at the beginning of
the feed-cam advancing stroke no braking action
need be overcome, while, as the rock-lever 45
approaches the end of its advancing stroke, the
braking action increases to a‘maximum so as to
prevent overthrow. The gradual increase of the
braking action‘ as the end of the feed-advancing
stroke is approached does not present any diffi
culty, inasmuch as the braking action is not ap
plied to the feed-cam until after the clutch
members 39 are in wedging relation between the
‘clutch-drum 33 and the spider 36. The fact that
no braking action exists during the short period
of‘time'that the clutch-members 39 are moving
‘into wedging relation minimizes clutch slippage.
her‘ end in a manner to project beneath one of
the clutch-element-releasing levers 68 thereby to
hold the lever upon its respective pivot-stud 69,
while the body portion of each retainer underlies
the clutch-member 39 to maintain the latter in
its cavity 37. The other end of each of the re
tainers ‘I0 is bent upwardly into substantially
hook-shape about a horizontal ?ange 12 integral
with the clutch-drum 33. By virtue of the above
described retainers T6, the clutch-members 39
and the clutch-elementereleasing levers 68 are
held in proper assembled position, and the live
clutch-spider is maintained within the clutch
drum 33. Removal of the clutch-releasing sleeve
66 and the retainers ‘l6 readily permits complete
disassembling of the clutch mechanism.
The means by which the spline 64 is shifted
up and down in its keyway 63 to elevate or lower
the clutch-releasing sleeve 66 comprises a collar
13 slidably mounted upon the feed-shaft l8 and
secured preferably by screws 14 to the spline 64.
Formed in the collar 73 is an annular recess 15
(Figs. 8 and 16) entered by a roller 76 carried
on'the inner end of a lifting lever 71 freely piv
oted on a fulcrum-stud 18 journaled in spaced
bearing lugs 18 integral with the Wall of the
' As is common in many buttonhole sewing ma
bracket-arm 3. The lifting lever ‘I’! is adapted
chines, the step-by-step movements of the work.
to‘ be actuated in a counterclockwise direction.
clamp relative to the laterally vibratory needle’ Fig. 10, to raise the spline 64 and consequently
are ‘suspended for a short time at the opposite
the clutch-releasing sleeve 66 to render the clutch
ends of the buttonhole, in order that a suitable
ineffective, by a vertically disposed rocker 80 se
number of barring stitches may be-made at each 65 cured on the fulcrum-stud 18, preferably as
‘end'of‘ the buttonhole. This suspension of the
shown in Fig. 16, by a set-screw 8|v and a taper
work-clamp feed is accomplished by automati
pin 82. The lower end of the rocker 80 is in
cally- controlled means operable to disengage the
peripheral contact with a feed-cam release actu
clutch employed for intermittently turning the
ating element in the form of a two-lobe cam 83,
feed-shaft and then to permit engagement of 70 Fig. 11, which is fast upon the feed-shaft l8.
the ‘clutch after the production of a plurality of
Each lobe of the cam is cut with a gradual rise
barring ‘stitches, the'exact number of which is
‘84 terminating in a drop-off 85 so that. asthe
determined- by a suitable bar-stitch counting
feed-shaft I8 is turned, the lower end of the rock
mechanism. .To this end, the feed-shaft i8 is
er 80 is gradually swung outwardly in opposition
formed lengthwisethereof and preferably for its 75 to a coil»spring 86, which is anchored at one end
2,411,593
7
to anarm :9] en the-bracket-arm ‘3 and connect-_
edvat :its other end to the lower end .of a vlever
arm .?z?ppinned to the fulcrum-stud '18. As the
outwardly {swinging-motion of :the rocker 80 :is
continued;atpawl-lever 89 .(Eigs. .8 and 10) .pivot
ally-carried on the rocker .80 is raised relative .to
the ‘lifting lever 'Il until a :step or shoulder 90
formed ‘ion. ‘the :pawl-lever 89 moves above the
level of the upper :edge of .the lifting lever 11
when, ‘under the ;action of the spring 9|, ‘the
pawl-‘lever 89 snaps into asubstanti'ally vertical
position ‘connecting the lifting lever "H with the
rocker 9.0, see full lineposition in Fig.4 18,. As the
feed-shaft It continues to turn and the drop-off
of the ‘cam "83 passes by the lower end of the
rocker x80, .the‘rocker snaps inwardly under the '
influenceof the coil-springzst and into a position
deterniinedizby an adjustable stop 92 carried by
thezroc‘ker .80. .This rapid inwardmotion of the
rocker 89, through thepawl-lever 89 and the lift
ing lever 'Ilraises the clutch-,releasingsleeve suf
?ciently'to ‘force the clutoh-elements'39 into an
ineffective or declutching position. In order'to
insure the rapid shifting of the clutch-elements
39:.into declutching'position,‘the rise on the cam
lobes r84 ‘preceding the drop-offs 85 is of such
heightthat the shoulder '90 on the pawl-lever 89
is raised to the extent that clearance'exists be
tweenthe sh'0u'1der‘99 and'the upper edge of the
lifting lever 11 (-Figs. 10 and'18). This clearance
permits ’'the pawl-lever 89 to strike the lifting
lever-TI with some force‘when the rocker 80 snaps
inwardly under the in?uence of the coil-spring
8'6,ithe sharp blow ‘of ‘the pawl-lever on the lift
ing'l'ever acting to drive the clutch-elements 39
out =ro'f wedging relation. ‘When the clutch-ele
mentsiare in their ine?ective ‘position, the feed
s'haft is‘.notintermittently‘rotated with the con
tinued operation ofithe'live clutch spider .36, but
remains ‘stationary. Thus the work-clamp is not
shifted'relatively to‘the‘laterally vibratory nee
dle. vAs willbe observed in .Figs. 11 and 19, the
_ two-‘lobe cam 83 is preferably. constructed so'that
its, two drop-o'ifs ‘Mare capable of adjustment
relative to the main body of the camto effect an
8
E. B..Allen,;-N0. 784,291,‘.dated'March 7, 1905, but
di?ering therefrom in details adaptingthe:mech-v
an'ism for more accurate‘ operation at higher
speeds. .As hereinbefore described, the needle;
bar-gate 1:3 is supported for vibratorymovements
on~the'_pintles.-I4,‘Fig. 1. Connected to the'upper
endpf ‘the needle-bar-gate I3 is one endgofgan
endwise extensible link 91 'adjustably connected '
at. its other, end 'to a vibratory lever.98 .fulcrumed
on iawpivot-stud 99 threaded into the bracket-arm
3. "The evibratory lever 98 is adaptedtobeactu
ated :by ‘a connector-link I99 -operatively,:con
nected, ina manner-laterto be described. to the
inner :end of an oscillatory actuator-lever 'I0I '
(Figs. 8,9 and 14) .fulcrumed-upon astudIllZ
threaded into the-bracket-arm (,3. The other end
oi‘pthe actuator-lever IOI has ?xed to it :a roller
I03 which tracks acam-groove I04 formed, in_,a
cam J95 fast upon the countershaft v6,. the speed
20 of rotation of which is one-half that of-‘the arm.
shaft 5 during ,the normal button-holing cycle.
It will be understood from the above-description
that rotation-of the cam I05‘ will cause the actup
ator-lever Hill to oscillate about its fulcrum-stud
25 I62, thus transmitting ‘vibratory movements to
the needle-.bar-gate I3 throughtheconnector
link I00, vibratory lever 98 and link 91. Adjust
ment of the length of the link 91 provides for
properlycentralizing the stitches relative to the
usual buttonhole slit.
Adjustment of-the endof
the-link ,9‘! on the vibratory-lever 98 permits reg
ulationof the amplitude of vibration of the nee.
olle-bar-gate I3 and hence the length of .the
stitches forming thebuttonhole.
It will be understood that the oscillatory ,actu- '
ator-lever WI and the connector-link I00 canbe
connected together-in t-woypositions; one of which
is the side-stitching position-andis close to the
fulcrum axis of the actuator-lever 'IOI and'the
other of which is ,the bar-stitching (position and
is-remote fromthefulcrum axis of the actuator
lever. Considering first the side-stitchingposi
tion, it vwill be observed'from Fig. 14 that'the
connector-‘link I90 ‘is formed with anotch I06
' shapedwith a ?aring mouth and a narrow throat.
the latter of whichyissizedto ‘snugly ‘engage the
periphery of an upstanding pin I0'I-attached to
the actuator-lever I0 I . The connector-link 190
.is biasedby a coil-spring I08 in a directionsuch
arcuate recessi'93‘in‘which‘is received a secondary
,camesect-ion‘94 adapted to be 'clamped'in proper 50 that the throat of the notch I99 is maintained in
engagement \with' the .pin I 01. Through the-me
"adjusted position ?by a- clamp-screw 95 extending
.dium-ofthe pinv I~9'I and~notch I96 the connector
“throughwanelo-ngated aperture :99 in the main
.link > I09 ‘is reciprocated= endwise 'by the oscilla
:bodyofrthe cam and threaded into‘ the'secondary
exact. adjustment ‘of the timing of the drop-offs
relative to‘lt‘he rockerv 80. To thisend, the main
‘body ofeach/of the lobes 84 is'provided'with an
cam-‘section "94. The 'timing'adjustment provided
.by the secondarycam-sections 94 insures thatthe
feed-:cam I1 .is “rotated ‘to ::a position such that
the‘ roller ‘on the end of the work-plate side-shift
jing ‘lever 25 is ‘disposed in the’ section 26a .or 26b
of the cam gro'ove'l?’formed‘in the feed-cam I'I
tory ‘actuator-lever IOI and thereby imparts
* movement to theneedle-bar-gate I3.
Considering now the bar-stitching position,
'willbe’seen in‘Figs. 8 and 14 that ‘the‘connector
linkalllilhasdepending from it a roller I109 which
extends into a keyhole slot 1 I0 formed in the
‘before zthe drop-off ‘85 .passes‘by the rocker ~80. 60 actuator-lever I91 at a distance more remote
.from the fulcrum vaxis of the-‘actuator-jlever IIII
.Ini'othe'r words,'by properly adjusting the sec
than thepin Illl. “The proportions‘ of the key
‘ondary‘cam-sectiOns :94 the needleiis unerringly
holeslot I-'I-9>are~such~that whentheroller I-0'9
shifted ‘to a‘ position central of the buttonhole
vis'd-isposed within the larger end of the vslot, as
prior to 'theautomatic increase in the amplitude
‘of the'needle vibrations preparatory to the pro 65 shown ineFig. 14,-. the clearance betweent-he sides
of'the slotVIIAB-andthe roller- I09 is such asnot
..duction of the ‘barring stiches.
to interfere- with the operation of the connector
To effect the production of the barring stitches
link 190 by the actuator-lever >I~0I. However,
during thetime that the work-clamp is station
when-theroller I09 vis :shifted into‘ the narrow
ary, the ‘amplitude of-the lateral vibrations of the
needle is customarily increased preferably to sub 70 'portionzof the keyhole slot H0 for production of
».the barring-stitches (see Fig. 15) ,~ the roller I09
stantially-twice that of the lateral vibrations of
engages the sides-of theslot I I9 and thereby con
.the needle during-the formation 'of ‘the side
--nects the link I09 with the oscillatory‘actuator
stitches. .The means’ by “which this is accom
lever 1 I 0 I. :When1thus connected, the pin I01
plished in the machine illustrated-is substantially
the isameas-that disclosed’ in the U. S.» patent-of
projecting upwardly-from the actuator-lever: I10]
2,411,493
.
'10
a
is located in the widely ?aring mouth of the
notch I06. From the above description it will be
in a clockwise direction, as seen in Fig‘. 13, against
action and will now be described. . As the lower
the life of the ratchet-wheel is increased.
an adjustable stop I25 depending from a cover
understood that when the connector-link I00 is
plate I26 and adapted to be clamped in desired
connected to the oscillatory actuator-lever IOI
“set position by a thumb-nut I2'I. To facilitate
by means of the notch I06 and. the pin I01 (Fig. 5 the proper setting of the stop I25 to obtain the
14) the needle-bar-gate is vibrated to elfect the
desired number of stitches in the bar there is
provided a pointer I28 (Figy'l) cooperating with
production of side-stitches, and that when the
connector-link I00 and the oscillatory actuator
suitable indicia. scribed on the cover-plate I26.
lever I M are connected together by the roller I09
As will be seen in Fig. 13, that portion of ‘the
and the keyhole slot I I 0 (Fig. 16) the needle-bar 10 ratchet-wheel I2I which is normally biased into
‘contact with the adjustable stop I25. comprises
tgate is vibrated to effect the production of the
longer barring stitches. The position of the
an arcuate plate-member I29 clamped for limited
circular adjustment by screws I30 in an annular
roller I09 in the narrow portion of the keyhole
slot H0‘ is determined by the adjustable stop
recess I3I formed in the upper face of the ratch
screw 92 threaded into the rocker 80.
15 et-wheel I2I. The arcuate plate-member I29
is adjustably clamped upon the ratchet-‘wheel
:_The means for shifting the connector-link I00
from side-stitching position (Fig. 1%) to the bar
$2 I so that different teeth on the periphery of the
.stitching position (Fig. 15) is automatic in its
ratchet-wheel may be brought into use, whereby
, ‘
end of the rocker B0 is gradually swung outwardly
The ratchet-wheel I2I is adapted to be ad
inopposition to the coil-spring 86 (Fig. 10) by
vanced in a counterclockwise direction as viewed
the cam 83 on the feed-shaft I8, the upper end
‘of the rocker 80 moves inwardly and carries with
it a pawl I I I secured to the rocker by a ball-stud
mounted on. an extension I33 of the oscillatory
in Fig. 16 by an actuating pawl I32 pivotally
actuator-lever IIII; the actuating pawl being
H2. The pawl III at its inner end is forked
to provide two limbs H3 and H4 of which limb
II3 is formed with "a shoulder II5 adapted to
snap, under the influence of a coil-spring IIE,
biased into engagement with the teeth in the
ratchet-wheel I2I by a leaf spring I34. Coop‘
erating with the actuating pawl I32 in advancing
the ratchet-wheel I2I is a detent-pawl I35 which
about aprojection II'I secured on the connector
functions to prevent retrograde‘turning of the
,link I00 when the pawl III moves inwardly as a 30 ratchet-wheel.‘ It will be understood that as the
result of the movement of the rocker 80 in re
actuator-lever IOI is oscillated about its fulcrum
sponse to the turning of the cam 83. Thus it will
stucl I02 by'the cam I05fthe actuating pawl I32
be seen that the upperend of the rocker 80 is
is operated in such a, manner as to ‘engage and
connected to the connector-link I00 when the
advance the ratchet-wheel I2I tooth-by-tooth
oscillatory actuator-lever IOI and the connector
and that the detent-pawl I35 maintains the
link’are operating in their side-stitching position.
ratchet-wheel in its various steps of advance’
When the cam 83 on the feed-shaft I8 is rotated
ment. After the number of barring stitches to
to the point where one of its drop-offs 85 passes
which the pointer I28 is set has been produced,
‘by the‘lower end of the rocker 80 the rocker, as
during which time the ratchet-wheel I2I is being
previously‘ explained,‘ snaps into a substantially 40 advanced by the actuator pawl I32,‘a trip-plate
vertical position under the influence of the coil
I35 adjustably secured in the annular‘ recess I3I
Ispr'ing ‘83 which‘ is stronger than coil-spring‘ I08
formed in' the‘ratchet—wheel I2I is brought into
“and thereby simultaneously raises the clutch-re
engagement with a pin I31 depending from a
cross-lever I33 pivoted intermediate its ends on
.leasing sleeve 66‘ to render the feed-clutch inef
fectiveand shifts the connector-link I00 from its
side-stitching position into its bar-stitching po
sition. In other words the rocker 80, when it
snaps into a substantially vertical position, acts
' a stud I39 threaded into the cover-plate I26, Fig.
15. After engagement of the pin I31 by the trip
plate I36, further turning of the ratchet-wheel
I2I, under the action of the actuating pawl I32,
through the pawl-lever 89, lifting lever 11, spline
‘swings the cross-lever I38 about its pivot I39fin
B4 and clutch-releasing sleeve 06, to render the 50 the direction indicated'by the arrow in Fig. 15
feed-clutch ineffective, thus terminating the
thus moving its free end into contact with the
step-by-step movements of the work-clamp and
upstanding tail portion of the pawl-lever ‘89.
simultaneously shifting the connector-link I00
Continued swinging movement of the cross-lever
from‘ the side-stitching position to the bar-stitch
I33 turns the pawl-lever 80, against the action of
the spring SI, thereby moving its shoulder 90
fromzits position vertically above the lifting lever
ing position. In order to relieve the needle—
thread‘of some of its tension during the forma
‘tionof' thebarring stitches, the thread-disks of
"II to the position indicated in dotted lines in ‘Fig.
the usual tension device H8 are adapted to be
18. Depending from the cross-lever I38 is’, a re
separated by a disk-separating plunger I I9 (Fig.
lease-pin I40 which, after the‘pawl-lever 89 is
1) which is moved upwardly by a cam. I20, at— 60 swung ‘out of operative relation with the lifting
tached to the connector-link I00, when the con
lever TI, is adapted to move into ‘contact the limb
nector-link is in its bar-stitching position.
H4 of the pawl I I I, Fig. 15; Further turning of
The number of‘ stitches included in each bar is
the‘crossH-lever I30 in response to the step-by
determined by a suitable bar-stitch counting
step advance of the ratchet-wheel I2I swings the
mechanism similar in design to ‘that disclosed in
pawl III about its ball-stud II2 causing the limb
II3 of the pawl III to release the‘projection In
the U. S. Patent No. 806,231 issued to E.‘ B. Allen,
December 5, 1905. Referring particularly to
on the connector-link IIO. ‘ When the projection
Figs. 9, 12, 13, 14 and 15, there is mounted for
II‘; is released the connector-link IIO, under ‘the
limited turning movement on the upper end of
in?uence of the coil-spring I08, snaps from bar
'the fulcrum-stud I02 ‘a ratchet-Wheel I2I secured
in position by a screw I22 (Fig. 9) threaded into
ring position, Fig. 15, to side-stitching position,
‘Fig. 12'. In moving from barring position to side
stitohing position a projection IIII‘on the con
the stud I02. Interposed'between the head of
the screw I22 and the ‘top of the fulcrum-stud I02
is a_ disk I23 resting‘upon a coiled spring I24
which functions to bias the ratchet-wheel I2!
hector-link I00 engages a tail-member I42 on the
75
ratchet-wheel actuatingpawl I32‘ and shifts the
actuating pawl in opposition tothe' leaf-spring
2,411,493
.11
12
_ ,
'ilx?i'from its effective “position shown in Fig. 15
said feed-cam for, relatively shifting said ‘stitch
to its ineffective ‘position :shown :in Figs. 12 and
13. As shownzin Fig. 13 this shifting of the actu
forming :mechanism and work-‘holder to sew
‘about a buttonhole, clutch means for rotating
said shaft, and means ~including an actuating
zating pawl ' I 32 causes it to'move into engagement
with :the 'detent-pawl 2| 35‘and to move the latter
.against its spring vI43 out ;of engagement with the
member shiftable axially of and rotatable “with '
:pawlzthe spring I221 biases lthe ratchet-wheel l2l
:in:a clockwise direction, Fig. 13, and against the
1817.013‘125, whereby the bar-stitch counting mech
zan‘ismis reset for the subsequent barring opera
'saidshaft for disabling said clutch means during
the formationof the buttonhole,
13.;A buttonhole :sewing machine having, in
vcombination, a work-holder, stitch-‘forming
mechanism including a reciprocatory and later
aa'lly vibratory ‘needle and barring mechanism for
changing the amplitude .of ‘vibration ,of ‘the-needle
‘121011.
‘to sew barring stitches at an -;end of the hut
teeth :on the ratchet-Wheel [2]. When ‘the
ratchet-wheel is ‘thus released from the detent
‘
in ‘order to .resume - the .side -stitching operation
itonhole, and :means _'for relatively moving ‘the
at the completion of "the barring operation, it is 15 stitch-forming mechanism and work-holder :to
acquired that the clutch-releasing sleeve '66 be
‘sew about a buttonhole, said means including a
idepressed to permit theclutch-members 739 to as
sume their :wedging relation between the clutch
drum 33 andithe Qlive clutch spider 36.v To this
end, :the i-connector-link ill!) ‘at its free end eX
z'tends laterally and then :forwardly to terminate
insa :relatively ‘short arm M4 ?tted with an ad
'justablescrew M5. Asshown in Fig. 15 when the
'zconnector-link 1% is located in its barring posi
tion the adjustable screw I45 is spaced from the 25
vertical limb “$6 :of :a bell-crank lever ls‘! freely
.to its side-stitching position (Fig. 12), the screw
"I145 strikes ‘the vertical limb Ills of ‘thebell-crank
slever M71, rapidly turning it about the fulcrum
stud 18. .As :the bell-crank lever turns, the hori
'
A. A buttonhole sewing machine having, in
combination,
a
work-holder,
stitch-forming
mechanism including a reciprocatory and later- i
‘ally Vibratory needle and barring ‘mechanism for
changing the amplitudeof vibration of ‘the needle
pivoted upon the fulcrum-stud 18, Fig. 16. When
zth?COllIlGCtOf-link 1:00 is released'from the pawl
=~Hll at the completion of the barring operation
and snaps from itsbarring‘position (Fig. 15') in
shaft, a feed~cam mounted ‘1,011 tsaid shaft, and :a
clutch ‘for turning ‘said feed-cam, and ‘means
including a "member extending lengthwise ofsaid
shaft and actuated by said ‘barring mechanism
‘for rendering said :clutc‘h ineffective ‘to rotate
‘said shaft.
to sew barring stitches at an end of the button
hole, means for relatively‘v "moving the stitch
30 forming mechanism and work-holder to sew
about a buttonhole, said means including a shaft
having ‘a clearance opening extending lengthwise
thereof, a feed-cam mounted ‘on saidshaft, and‘a
zontalli-m-b 1:48 thereof moves-downwardly and a 35 clutch for turning said"~feed-cam, and a clutch
re'leasing rod slidable in the clearance opening
roller/149 carried at the free end of the hori
in said shaft for ren‘deringsaid clutch ineffective,
,zontal limb M8 and disposed in the annular re
‘thereby to ‘interrupt the "relative movement be
cessrliof the collar!“ slides the collar down
tween said stitch-forming mechanism and said
wardlycn the feed-‘shaft L8. The collar through
work-‘holder upon-initiation of the barring "opera
the splineéeé lowers the, clutch-releasing sleeve
tion.
, 56 toapositi-on such that the clutch-element-re
'
‘.5. A buttonhole sewing ,machine having, ‘in
(leasing levers~68 do not prevent ‘the clutch-mem
bers .39 from wed'ging the live clutch-spider 36 to
combination, I
a
work-‘holder,
stitch-forming
mechanism ‘including a reciprocatory "and “later
ally vibratory needle and ‘barring mec'hanism'for
45
‘From the above ‘description it vwill be under
changing the amplitudeo'f vvibration of theneedl'e
.stood that the present invention contemplates a
.to sew barring stitches at an endlof the button
mechanism whereby the suspension of the work
“hole, and. means for relatively .moving'the stitch‘
olam-p ,feed is accomplished ‘with certainty, by
,theclutch-drum .33.
_
>
1
v
.
forming mechanism and work-‘holder to sew
about ,a buttonhole, said means including .a shaft
arranged so that said barring mechanism is dis
automatically controlled means operable to dis
,engage the clutch employed for intermittently
turning the feed-shaft and which will permit
posed adjacent one ,end ‘of the shaft, a ‘feed-cam
mounted on said shaft adjacent the end remote
from the vbarring mechanism, aclutch for "turn
ing said shaft; .and a clutch-releasing rod eX
the ,unerring engagement of the clutch to rees
tablish the work-clamp feed after the production
,of ,a plurality .of barring stitches, the number of
which is determined ‘by a suitable bar-stitch,
counting ‘mechanism.
tending ‘lengthwise .of-said shaft and actuated .by
said barring mechanism for renderingsaid .clu'tch
ineffective, thereby to interrupt" the relative
movement between said stitch-forming mecha
Having thus set forth the natureof the inven
tion, what I ‘claim herein is:
1. In a buttonhole sewing machine, in combi
nation, stitch-forming mechanism including an
lendwise reciprocatory and laterally vibratory
needle, ,a work-holder, a rotary shaft, a feed-cam
oarriedby said shaft, operativeconnections with
60
nism and said work-holder.
'
i
B. A buttonhole sewing machine having, in
combination, a work-holder, stitch-forming
mechanism includinga reciprocatory and laterally
vibratory needle and barring mechanism 'for
,said feed-cam for relatively shifting said stitch
,forming‘meohanism and work-holder to sew 6 changing theamplitude of vibration of the needle
to sew barring stitches ‘at ‘an .end .of the ‘button?
7 hole, and means for relatively moving the stitch
forming mechanismand work-holder to sew about
a buttonhole, saidlmeans including a shaft hav
abling said clutch :means during ‘the formation
70 ing a clearance opening ‘formed lengthwise
‘Of :the buttonhole.
'
thereof, a feed-cam mounted on said shaft, an
In "a ibuttonhole- sewing machine, in combi
about a buttonhole, clutch means for rotating
said shaft, and means including an actuating
‘member .shiftable axially of said shaft for dis
aendwise reciprocatory and laterally vibratory
actuating clutch coaxial with said ,shaft and
operated to turn said feed-cam, and ‘a clutch-,
:needlej, a work-holder, .a rotary shaft, a feed-cam
releasing rod disposed in said clearance opening
‘carried :by said shaft, operative connections with
and :shiftable lengthwise of said shaft under the
nation, stitch-forming mechanism including an
2,411,493
13
14
‘in?uence of said ‘barring mechanism to render
forming mechanism and work-holder to sew about
said clutch ineffective to turn said feed-cam.
a buttonhole, said means including a shaft, a
'7. A buttonhole sewing machine having, in
combination, a work-holder, stitch-forming
feed-cam mounted on said shaft,
about a buttonhole, said means including a shaft
shifting said member into its operative position,
and means actuated by said barring mechanism
for shifting said member into its inoperative
position, said feed-cam release actuating element
being adjustable to vary the timing between the
a
clutch
mounted to turn said shaft, a member extending
“mechanism including a reciprocatory and later- ' GI lengthwise of said shaft and having an inopera
_ ally vibratory needle and barring mechanism for
tive position in which said clutch- is effective and
changing the amplitude of vibration of the needle
an operative position in which said clutch- is
to sew barring stitches at an end of the button
ineffective, a feed-cam release actuating element
hole, ‘and means for relatively moving the stitch
fast on said shaft, means connecting said feed
forming mechanism and work-holder to sew
cam release actuating element to said member for
having a clearance opening formed lengthwise
thereof, a feed-cam mounted on said shaft, a
clutch mounted to turn said shaft, said clutch
including a drum, a spider, and at least one
clutch-member disposed between said drum and
feed-cam and the feed-cam release actuating
said spider, a rod disposed in said clearance open
element,
.
n
ing and shiftable lengthwise of said shaft under
11. A buttonhole sewing machine having, in
the in?uence of said ‘earring mechanism, and an
combination, a work-holder, stitchjforming
‘element secured to said rod and positioned to 20 mechanism including a reciprocatory and later
cause said clutch-member to be retracted from
ally vibrating needle and barring 'mechanism
effective action when said rod is shifted, thereby
for changing the amplitude of vibration of the
to render said clutch ineffective to turn said
needle to sew barring stitches at an end of the
shaft.
,
buttonhole, and means for relatively moving’ the
stitch-forming mechanism and work-holder to
8. A buttonhole ‘sewing machine having, in
combination,
a
work - holder,
stitch - forming
sew about a buttonhole, said means including a
mechanism including a reciprocatory and later
shaft arranged so that said barring mechanism
is disposed adjacent one end of the shaft; a
ally vibratory needle and barring mechanism
‘for increasing, the amplitude of vibration of the
feed-cam mounted on said shaft remote from
needle to sew barring stitches at an end of the 30 said barring mechanism, a clutch located adja
buttonhole, and means for relatively moving the
cent said feed-cam and mounted to turn said
stitch-forming mechanism and work-holder to
shaft, a member extending lengthwise of said
' sew about a buttonhole, said means including a
shaft and having an inoperative position in which
shaft,.a feed-cam mounted on said shaft, a clutch
said clutch iseffective and an operative position
mounted to turn said shaft, a member extending
in which said clutch is ineffective, a feed-cam
lengthwise of said shaft and having an inopera
release actuating element fast on said shaft inter
tive position in which said clutch is effective and
mediate said feed-cam and said barring mecha
an operative position in which said clutch is in
nism, means connecting said feed-cam release
effective, a feed-cam release actuating element
actuating element to said member for shifting
fast on said shaft, means connecting said feed 40 said member into its operative position, and means
cam release actuating element to said member
actuated by said barring mechanism for shift
for shifting said member into its operative posi
ing said member into its inoperative position.
tion, and means actuated by said barring mech
12. A buttonhole sewing machine having, in
anism for shifting said member into its inoper
ative position.
combination,
’
combination,
a
work-holder,
stitch-forming
mechanism including a reciprocatory and later
hole, and means for relatively moving the stitch
for shifting said member into its operative posi~
tion, means actuated by said barring mechanism
for shifting said member into its inoperative posi—
tion, and means for varying the timing between
said feed-cam and said feed-cam release actuat
ing element.
10. A buttonhole sewing machine having, in
combination, a work-holder, stitch-forming
mechanism including a reciprocatory and later
ally vibratory needle and barring mechanism for
changing the amplitude of vibration of the needle
to sew barring stitches at an end of the button
hole, and means for relatively moving the stitch~
stitch-forming
hole, and means for relatively moving the stitch~
forming mechanism and work-holder to» sew about
forming mechanism and work-holder to sew about
a button-hole, said means including a shaft, a
feed-cam mounted on said shaft, a clutch in Li
mounted to turn said shaft, a member extending
lengthwise of said shaft and having an inopera
tive position in which said clutch is effective and
an operative position in which said clutch is
fast on said shaft, means connecting said feed
cam release actuating element to said member
work-holder,
to sew barring stitches at an end of a button
ally vibratory needle and barring mechanism for
changing the amplitude of vibration of the needle '
to sew barring stitches at an end of the button
ineffective, a feed-cam release actuating element
a
mechanism including _a reciprocatory and later
ally vibratory needle and barring mechanism for
changing the amplitude of vibration of the needle
9. A buttonhole sewing machine having, in
a buttonhole, said means including a shaft, 2.
feed-cam mounted on said shaft, a clutch for
turning said shaft, said clutch having a driven
element and a constantly operating driving live
element, and means interconnected with said
barring mechanism for rendering said live ele
ment ineffective during the continued operation
of the live element of said clutch, thereby to
interrupt the relative movement between said
stitch-forming mechanism and said work-holder
to form barring stitches.
13. A buttonhole sewing machine having, in
‘combination, a frame including a bed and an
overhanging bracket-arm, an actuating shaft
' journaled in said frame, a work-holder, stitch
fo-rming mechanism including a reciprocatory
and laterally vibratory needle, and means for
relatively moving the stitch-forming mechanism
and work-holder to sew about a buttonhole, said
means including a feed-cam, a clutch for turn
ing said feed-cam, a clutch actuating arm, a
rock-shaft journaled in said frame in substantial
parallelism with said actuating shaft, a plurality
of rock-levers connected to said rock-shaft, a link
connecting one of said rock-levers to said clutch
gauges
1'5
16
ing element fast on said shaft, means, connect
ing said feed-cam release actuating element to
said member for shifting said member into its op
erative position, said last named means includ
combination, a frame including a bed and an 91 ing a lifting lever operatively connected with
said member, a rocker actuated by said feed-cam
overhanging bracket-arm, an actuating shaft
release actuating element, and a pawl-lever
vertically disposed and journaled in said frame,
adapted to connect- said rocker with saidvlifting
a work-holder, stitch-forming mechanism in
lever, and means actuated by said barring mech
cluding a reciprocatory and laterally vibratory
needle, and means for relatively moving the 10 anism for shifting said member into its inopera
tive position.
v
stitch-forming mechanism. and. work-holder to
16-. A louttonholev sewing machinev having, in
sew about, a buttonhole, said means including a
combination, a work-holder, stitch-forming
feed-cam, a clutch disposed, within said bed for
mechanism including a reciprocatory and later
turning said feed-cam, a clutch actuating arm, a
ally vibratory needle and, barring mechanismv for
rock-shaft, journaled in said. bed in substantial
actuating arm, an eccentric fast on said actuat
ing shaft, and‘ a pitman connecting another of
said rock-levers to said eccentric.
14. A buttonhole sewing machine having, in
parallelism with said actuating shaft, a plurality
of rock-levers carried by said rock-shaft, a link
connecting one of said rock-levers to said clutch
actuating' arm, an eccentric fast on said actuat
ing shaft, and a pitman connecting another of
said I‘OCKr'IBVBI‘StO said eccentric.
15.. A louttonhole sewing machine having, in
combination, a work-holder,‘ stitch-forming
mechanism including a reciprocatory and later
ally vibratory needle and barring mechanism for
changing the amplitude of vibration of the needle
to sew barring stitches at an end of. the button
hole, means for relatively moving the stitch
forming. mechanism and work-holder to sew
about abuttonhole, said means including a shaft,
a feed-cam. mounted on said shaft, a. clutch
amounted to turn. said shaft, a member extend
ing lengthwise of said shaft and, vhaving an in
operative position in which said clutch is effec
tive and an operative position in which said
clutch is ineffective, a feed-cam release actuat
changing the amplitude of vibration of, the
needle to sew barring stitches at an end of the
buttonhole, and means for relatively moving the
stitch-forming mechanism and work-holder to
sew about a buttonhole, said means including a
shaft, a feed-cam mounted on said shaft, a clutch I
mounted to turn said shaft,-a member extend
ing lengthwise, of said shaft and having an in,
operative position in which said clutch is effec
tive and an operative position in which said clutch
is ineffective, a feed-cam, release actuating ele
ment fast on said shaft, means connecting. said
feed-cam release actuating element to said mem
ber for shifting said member into its operative
position, and meansfor shifting said member
into its inoperative position, said. last. named
means including a lever actuated by said. barring
mechanism and operatively connected to said,
member.
ALFRED. R.‘ WOOD.
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