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Патент USA US2270552

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Jan. 20, 1942.
J, ‘H, PIKUL ETAL
'
2,270,552
BUTTON SEWING MACHINE
Filed Jan. 5,‘ 1938
16 Sheets-Sheet 1
INVENTORSI
ATTORNEYS
Jan. 20, 1942.
J. H. PIKUL ET AL
2,270,552
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
16 Sheets-Sheet 2
INVENTORS:
ATTORNEYS
‘
Jan. 20, 1942.
J. H. PIKUL ETAL
'
‘
2,270,552
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
16 Sheéts-Sheet s
ATTORNEYS
Jan. 20, 1942.
J. H. PIKUL ETAL
2,270,552
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
16 Sheets-Sheet 4
EM
INVENTORS.
ATTORNEYS
Jan. 20, 1942.‘
l J. H. PlK-UL _ETAL
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
2,270,552 '
.'
16 Sheets-Sheet 5
Jan. 29, 1942.
1 J, H, PlKUL ETAL
2,270,552
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
_
16 Sheets-Sheet 6
BY
A‘TTORNEYEL
Jan. 20, 1942.
J. H. PIKUL ETAL
'
2,270,52
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
l6 Shéets-Sheet .7
ATTORNEYS‘
Jan. 20, 1942.
J_ H__ PlKUL ETAL
2,270,552
BUTTON SEWING MACHINE
Filed Jan. ,5, 1958
'
l6 Sheets-Sheet 8
ATTORNEYS
58.11.20, 1942.
J; HPIKUL ETAL
2,270,552 > ‘
BUTTON SEWING MACHINE
F‘i‘led Jan; 5, 1938
16 Sheets-SheetQ
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Jan. 20, 1942.
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J. H. PlKUL- EI'AL
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BUTTON SEWING MACHINE
Filed Jan. 5, v1958
16 Sheets-Shegt 12
INVENTORS:
ATTORNEYS
Jan. 20, 1942.
' J, H, PIKUL Em
'
2,270.552
BUTTON SEWING MACHINE
Filed m. 5, ‘1938
16 Sheets-Shget 1s
ATTO R'N 5Y5..
‘Jan. 20, 1942.
J_ H, PIKUL ETAL '
2,270,552
BUTTQN SEWING MACHINE
Filed Jan. '5, 1938
By
16 Sheets-Sheet 1Q
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ATTO RN EYS .
Jan. 20, 1942.
J, H, pm; ‘ET AL
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BUTTON SEWING MACHINE
Filed Jan. 5, 1938
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2,270,552
_
16 Sheets-Sheet 15
INVENTORS I /
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BY
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ATTORNEyS_
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Jan. 20, 1942.
_|_ H_ P|kUL ETAL
2,27%552
BUTTON SEWING MACHINE
Filed Jan. 5, 1938
16 Sheets-Sheet 16
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Patented Jan. 20, 1942
' 2,210,552
UNITED STATES PATENT OFFICE
2,270,552
BUTTON SEWING MACHINE
Joseph H. Pikul, Boston, Mass., and Samuel W.
Avis, Providence, R. 1., assignors to The Reece
Button Hole Machine Company, Boston, Mass.,
a corporation of Maine
-
‘
Application January 5, 1938, Serial No. 183,480
In Great Britain February 24, 1936
13 Claims. (C1. 112-—110)'
This invention relates to machines for sewing
on buttons, and especially to automatic ma
chines for sewing substantially ?at buttons hav
ing each two pairs of thread-receiving perfora
tions or holes through each of which pairs a
group of attaching stitches is passed. The pres
.ent case is a continuation in part, and with re
spect to common subject matter, of our prior
The present invention has for its object to pro
vide an entirely automatic single needle but
ton sewing machine which, having been set in
operation, will, before being brought to rest, per
form and complete all of the operations neces
sary to form two groups of attaching stitches
through two pairs of holes in a button, each
group being separate and distinct, each being
completed by a tying stitch independently of the
10 other, and the thread being automatically sev
In single needle machines for automatically
ered between groups, so that there is no ex
sewing a four-hole button in one cycle of oper
posed, unsightly and readily broken line of
ation, the sewing through successive pairs of
thread extending acrcssthe face of the-button
holes is necessarily continuous, that is to say,
application ?led‘ September 30, 1936, Serial No.
103,326.
-
after the completion of va group of attaching
stitches through one pair of holes the work is
at once shifted to bring another pair of holes
between the rows of holes, and accidental break
age of the thread of the stitches of one group
in some instances, the thread has been secured
by a tying or knotting stitch. In machines of
this type as heretofore constructed and operated,
for purposes of exempli?caton merely, as it will
"will not‘ meet the integrity and security 'of the
stitches of the other.
into position to receive attaching stitches, the
The invention will best be understood from the
operation of forming attaching stitches continu
following description of certain illustrative em
ing without interruption until all have been com 20 bodiments thereof shown in the accompanying
pleted through both pairs of holes, after which,
drawings, these, however, having been chosen
- when passing from one row of holes to another '
be obvious to those skilled in the art that said
invention, as de?ned by the claims hereunto ap
pended, may be otherwise embodied without de
parture from the spirit and scope thereof. '
the thread is laid across the face of the button
in an exposed position where it not only presents
In said drawings:
‘
an unsightly appearance but is easily broken, in
,
Fig.
1
is
a
side
elevation,
partly
broken away,‘
which event there'is nothing to prevent the un
raveling of the stitches of the group ?rst 30 of the complete machine.
Fig. 2 is a detail view illustrating the attach
formed. Also, should the thread of the stitches
ment of a four-hole button.
_
.
of the second group formed be accidentally bro
Figs. 3 and 4 are sections taken substantially
ken, the stitches of both groups are liable to un
on‘ the lines 3-3 and 4-4, respectively, Fig. 1.
raveling, wholly or in part. In view of these
Figs. 5 and 6 are detail perspective views of the
difficulties, the type of single needle machine
now generally in use is designed to sew the sev
eral groups of stitches through the respective
pairs of holes in separate and distinct cycles of
loop de?ector and cooperating thread cutter, re
spectively.
Fig. 7 is a plan view, partly in section on the
line ‘l-‘l of Fig. 1.
machine, the machine is started and operated 40 Fig. 8 is a detail perspective view of the lower
needle bar guide carrier.
through a complete cycle to sew through one
pair of holes a group of attaching stitches which
Fig. 9 is a section taken on line 9—9 of Fig. 4.
may be completed by a tying stitch, after which
Fig. 10 is a fragmentary plan view of the looper
operating mechanism.
the machine is brought to rest; the work clamp
is then lifted to break the thread and is, shifted
‘Fig. 11 is a plan view, and
V
'
to bring the other pair of holes into sewing po
Fig. 12 is a side elevation of the maincam.
sition; and the machine is again started to per
Fig. 13 is a section on the line |3—l3, Fig. 12.
form a second cycle of operations during which
Fig. 14 is a fragmentary plan view, partly in
operation: in other words, in the use of such a
a second group of stitches is sewn through the
section, of the mechanism for controlling the
second pair of holes. Such division of the com 50 looper mechanism in the formation of the tying
plete sewing operation into two separate steps
or cycles, between which the machine is stopped,
the work clamp lifted, and the machine again
started, is inconvenient, time-consuming, and
generally unsatisfactory.
stitch.
Figs. 15 and 16 are horizontal sections taken
substantially on the lines i5-l5 and l6—-i6 re
spectively, Fig. 1.
‘
Figs. 17 and 18 are fragmentary detail views of
2,270,552
2
under the control‘ of automatic stop mechanism
certain 01' the parts of the stop mechanism,
showing them in different positions.
Fig. 19 is a fragmentary detail view of certain
of the parts in Fig. 3.
hereinafter described; a vertical cam shaft ‘I8
Joumalled in suitable bearings in the housing ‘I2,
driven through a worm 25 and worm gear 28 from
the main shaft 18, and provided with suitable
cams for controlling the movements of the several
lnstrumentalities; and a horizontal looper shaft
18 joumalled in suitable bearings in the base ‘I8
Figs. 20 and 21 are detail sections taken sub- '
stantially on the lines 28—20 and 2l-2l respec
tively, Fig. 15, showing the parts in different po
sitions.
Figs. 22 to 27 are detail views, partly in sec
tion and partly in front elevation, of the stitch
forming mechanism illustrating the operation
and operated and controlled from the cam shaft
10 ‘II.
during the attaching-stitch-forming cycle.
Figs. 28 and 29 are sections taken on the lines
28-28, Fig. 23, and 28-28, Fig. 24, respectively.
The stitch-forming lnstrumentalities include
an eye-pointed needle 80, carried by a needle
bar 8| mounted for vertical or longitudinal re
clprocation in the head ‘H, and a pair of loopers
Figs. 30 to 36 are schematic views illustrating [5 82 and 88 (Fig. 4) on a looper carrier 84 secured
to thelooper shaft 18 adjacent its forward end.
more in detail certain steps in the formation of
The sewing thread t is supplied to the needle 88
the attaching stitches. Fig. 30 comprises, at the
from a suitable source, not shown, through a
top, sectional perspective views of the thread
tension device or thread clamp 85 and suitably
clamp and take-up and front elevations of their
respective cams, and, at the bottom, a fragmen 20 arranged guides on the head and needle bar and
shown, for example, at 88 and 81, under the con
tary perspective view of the stitch-forming de
trol of a take-up 88 operated by a cam 422 on the
vices, showing the latter in the position corre
shaft 18, all as hereinafter further explained.
sponding to the positions of the thread clamp
The needle bar 8| is longitudinally reciprocated
and take-up. Figs. 31 to 36 correspond to the
bottom part of Fig. 30 and show the stitch-form- . . from the main shaft 18 by any suitable means, as,
for example, a crank pin 88 carried by a disk 88
ing devices in different positions.
on said shaft and connected by suitable linkage
Figs. 37 to 44 are views similar to Figs. 22 to 2'7
illustrating the operation of the stitch-forming
8| with a collar 82 on said needle bar, and is guid
ed adjacent its upper end in a bearing 88 which,
mechanism during the tying-stitch-forming cycle.
Figs. 45 to 49 are views similar to Fig. 30 ii 30 as shown, is carried by a ?exible metallic disk 84
suitably clamped in a recess 88 in the upper end
lustrating certain steps in the completion of the
of the head 'I I. This mounting of the needle bar
tying stitch of one group of‘ stitches and the ini
guide 88 is such as to permit the needle bar a '
tiation of the second group.
limited universal swinging movement about the
Fig. 50 is a view similar to Fig. 4, but showing
point of intersection of its axis with the plane
the bed or horn in transverse section, illustrating
of the disk 84. Adjacent its lower end the needle
a modi?ed form of mechanism for operating the
bar is guided in a bearing 88 similarly mounted
loop handling elements.
by means of a disk 81 in a carrier member 88
Fig. 51 is a longitudinal section taken substan
mounted, as hereinafter described, for movement
tially on the line Bi-Sl, Fig. 50.
Fig. 52 is a fragmentary plan view, partly in 40 in a horizontal plane both laterally and longitu
dinally of the machine frame.
section on the line 52—52, Fig. 51.
In attaching a four-hole button B, as shown
Fig. 53 is a detail perspective view of the loop
in Fig. 2, the carrier 98 is oscillated laterally be
de?ector employed in the modification shown
tween successive descents of the needle 88 to
in Figs. 50 to 52.
I
cause said needle to pass alternately through the
For convenience the invention is herein illus
holes h.’ and M in the button, the looper carrier
trated in connection with a button sewing ma
being at this time oscillated laterally by the shaft
chine of the character shown and described in an
18 to cause the loopers to cooperate with the
application Serial No. 60,616, ?led January 24,
needle, as hereinafter more fully explained, in
1936, by Franklin A. Reece, and in order to make
clear the purpose and operation of the mecha M) the formation of stitches s’ passing through said
holes. Thereafter the carrier 98 is shifted lon
nism to which the present invention relates, the
gitudinally, or in a direction fore and aft of the
general construction and operation of the ma
machine, tobring the needle into the plane of
chine of said application will be brie?y outlined.
the holes b3 and M of the other pair, the‘looper
Referring to Figs. 1 and 3, the frame or casing
shaft 19 with the looper carrier 84 and loopers
of the machine comprises a base or bed 18 and
82 and 83 being similarly shifted to maintain the
an overhanging head ‘H supported therefrom by
cooperative relationship of said loopers with the
an upright housing portion 12 enclosing the prin_
needle. Thereafter the sewing operations are re
cipal parts of the operating and controlling de
peated to form a second set of attaching stitches
vices. For convenience of‘ assembly and repair
said frame ‘or casing comprises two separable 60 s2 passing through the holes 713 and M.
The carrier member 88 for the lower needle
but normally connected main sections A’ and A2
bar guide 98 is guided for longitudinal move
and several attached minor parts all of which
ment in a groove in the top of a head Hi8 (Figs.
collectively afford the necessary enclosures, sup
ports, bearings, etc., for the various moving parts.
1 and '7) having a shank or trunnion I01 re
The bed 10 carries a work plate ‘I8 upon which 65 ceived in a socket I08 in the bottom wall of the
head 1| of the machine, whereby said head I08
the fabric W to which the buttons are to be at~
is pivoted for oscillation about the axis of said
shank. Said carrier 98 is, therefore, free to move
longitudinally in the head I88 or to oscillate lat
clamp 15 for holding the individual buttons B
and positioning them for the operation of the 70 erally with said head about the pivotal axis of
tached is supported and against which it is
clamped by a presser foot ‘I4 carrying a button
sewing lnstrumentalities.
-
The main driving and controlling instrumen
talities include a main power shaft 18 journalled
in suitable hearings in the head ‘H and to which
power may be applied through a belt pulley 11 '
the latter.
'
The carrier 88 is oscillated laterally about the
axis of the pivot I81 to cause the'needle to pass
alternately through the holes h’, M or h3, 71.4, by
mechanism more fully described in said Reece
2,270,502
application. Generally speaking, said mecha
nism comprises a link II9 (Fig. 7) suitably con
nected at one end with the carrier and provided
at the opposite end with a stud I28 received in
an arcuate groove I2I in one arm of a lever I22
secured to an upright shaft I23 journalled in the
casing. At its opposite end the lever I22 carries
a pin I26 which engages a cam groove I21 in the
cordance with the fore and aft spacing of the
holes M, 11.2 and 123, M, there is provided a fork
I88 carried by a yoke I88 (Figs. 1 and 3) which is
operated from the exterior of the casing by a
hand lever I89 as more fully described in‘ the
Reece application above referred to.
>
The oscillations of the looper shaft 19 are ef
' fected through a slip coupling or clutch I19 and
I88 (Fig. 10) and suitable connections including a '
upper face of a main cam I29 (see also Figs.
1, 3 and 11) fast on the vertical cam shaft 18.
With this construction it will be seen that rota
tion of the cam I29 will cause the lever I22 to >
swing about the axis of the shaft I 23, and that
this movement will be transmitted from said
lever to the carrier 99 through the link H3.
The amplitude of the lateral vibration thus
imparted to the carrier 98 will depend upon the
point of engagement of the stud I28 with the
groove I2I, and in order to permit this to be
readily adjusted in accordance with the lateral
spacing of the holes in the button, the link H3
is provided with a third stud I38 engaged by a
. 3
link I98 (Figs. 1 and 3) provided with a. trans
verse stud I9I the inwardly projecting end of
which is received in an arcuate groove I92 (see
also Fig. 10) in one end of a lever I93 fulcrumed
at its opposite end on a stud I94 projecting in
wardly from the side wall of the housing 12.
Intermediate its ends the lever I93 carries a pin
I95 engaging a cam groove I91 formed in the
side or periphery of the main cam I29. The
groove I91 corresponds to the groove I 21, that
20 is to say, the number and timing of the oscil
lations of the looper shaft 19 produced by the v
former correspond to the number and timing of
fork I3I carried by a slide I32 guided for hori
the lateral oscillations of the needle produced by
zontal movement on the side wall of the head 1|.
the latter. The amplitude of oscillation of the
The mechanism for moving the carrier 98 ion 233 looper shaft 19 depends upon the position of the~
gitudinally is likewise shown in Fig‘. 7 and com
stud I9I in the groove I92 of the lever I93, and
prises a link I46 having at its forward end a stud
in order that this position may be suitably ad
I41 received in a transverse groove or way I48
justed concurrently with the adjustment of the
in the upper face of the'carrier 98 adjacent the
position of the stud I28 in the groove I2I of the
rear end of the latter. The stud I41 also piv 30 lever I22, the slide I32 (Figs. 1, 3 and '7) by
_ otally connects the link I46 with an arm I49 (see
also Figs. 3 and 10) on a vertical rock shaft I168
which the latter stud is adjusted is provided with '
9. depending ?ange 282 having a slot 283 to re
journalled in suitable hearings on the interior
of the main casing. At its rear end the link
ieilve the outwardly projecting end of the pin
I46 carries a stud I5I which engages a groove
I52 in an arm I63 secured to a second vertical
When the needle bar carrier 98 is shifted lon
rock shaft I54. Adjacent its lower end the rock
shaft I 54 has secured thereto an arm I66 hav
ing a bifurcated end between the branches of
which is pivoted the end ofa link I66 having a
slot I61 to receive a stud I69 (see also Fig. 1)
depending from a bracket or interior frame mem
ber I59 within the main casing. The link I 58
is therefore, guided on the stud I58 by engage
ment of the latter‘ with the slot I61 and is sup
ported by a ?ange or head I68 (Fig. 3) on the
lower end of‘ the stud. The link I66 has se
cured thereto a pair of contact or cam follower
blocks I6I embracing between them and co
operating with an edge cam I62 rotatably mount
ed on the stud I68 and the hub of which is pro
vided with a spur gear I63 meshing with a pin
9
.
.
'
gitudinally, or in a direction fore and aft of the
machine, in order to transfer the operation of
the needle from the plane of one pair of holes, for
example, the holes M, 712, vto the plane of an
other pair, for. example, the holes h3, 714, the
looper shaft 19 must be likewise shifted longi
tudinally to maintain the proper cooperative re
lationship of the loopers to the needle. This is
effected by the vertical rock shaft I68 (Figs. 3, 7
and‘ 10) whose arm I49 is connected with the link
I48 by the pin I41. This rock shaft has secured
to its lower end a second arm 284 (see also Fig.
1) connected by a link 288 with a fork 288
through openings in the arms of which the loop
50 er shaft 19 extends, and whose arms embrace a
collar 281 secured to said looper shaft, whereby
when the carrier 98 is shifted longitudinally by
ion I64 on the lower end of the main cam shaft
the lever I53 acting through the link I46, the
18. The gear I63 and pinion I64 are of such
shaft
19 will be correspondingly shifted longi
sizes as to constitute two to one gearing between 55
tudinally. It will be noted that the length of
the cam I62 and the cam shaft 18, so that the
the arm 284 isgreater than that of the arm I49
cam I62 is rotated at one half the speed of the
to compensate for the difference in distance from
main cam I29. Accordingly; after one complete
the
pivotal center of the needle bar guide 93,
rotation of the cam I29 to cause thecamgroove
of the shaft 19 and needle bar carrier 98, respec
I21 thereof to produce a predeterminednumber
tively.
of lateral reciprocations of the needle bar to 60.
The main cam I29 makes one complete rota
form, for example, the group of stitches s’ (Fig.
tion for each group of stitches s’ and s2, and the
2), the cam I62 will cause the carrier 98 and
number of stitches of each group depends upon
needle bar to be shifted longitudinally of the
the shape of the cam grooves I21 and I91. Re
machine in one direction, after which a second
ferring to Fig. 11, the cam groove I21 is formed
rotation of the cam I29 will cause the necessary
number of lateral reciprocations to form the
group of stitches s2, whereupon the cam I62 will
return the carrier and needle bar to their original
longitudinal positions.
The amplitude of the longitudinal or fore and
aft movement of the carrier 98 and needle bar
8| is determined by the position of the stud I5I
in the groove I52 of the arm I53, and, in order
that this may be conveniently adjusted in ac
with ?ve radially offset portions, adapted to pro
duce ?ve complete lateral reciprocations of the
needle in synchronism with the vertical recipro
cations thereof, and with a concentric portion
23I during which the needle is ‘caused to make
two descentsthrough the same hole in the but
ton in order to form a knot or tying stitch, as
hereinafter further explained, it being under
stood that the groove I91 is correspondingly
formed to produce the requisite cooperative os
2,270,552
4
cillatory movements 'of the looper. Consequent
hr, each group of stitches will comprise ten at
taching stitches and a tying stitch, the whole
group requiring twelve vertical reciprocations of
the needle.
‘
The belt pulley 11 (Fig. 1) is loose on the shaft
18 and is adapted to be clutched thereto by a
combined clutch and stop mechanism which as
herein shown is similar to those shown and de
rocking the shaft 385 in the direction to move
the stop arm 289 into the position shown in dot
and-dashlines in Fig. 17. The machine having
been started will continue to operate until auto
matically stopped. For this purpose the follow
ing mechanism is provided:
Secured, as by a set screw 388 (Fig. 19), to
the inner end of the rock shaft 385 is an arm
298 (see also Figs. 16 and 18) having a bifurcat
scribed in the patents to Mello, No. 1,227,643, 10 ed end between the bifurcations of which is piv~
oted a bunter 299 having a bevelled free end 388
May 29, 1917, and Reece No. 1,730,014, October
(Fig. 16) adapted, when said bunter is in the ele
1, 1929. Referring to Figs. 17 and 19 to 21, said
vated position shown in Fig. 17 to be engaged
mechanism includes a ring 218 carried by the pul- .
by a stud 381 (Figs. 11, 12, 16 and 18) projecting
ley 11 and having a pin 211 which projects
through a slot 218 in said pulley and is engaged 15 from the underside of the main cam 129 when
the latter reaches an angular position corre
by a spring 219 located in a recess in said pulley,
sponding to the completion of a group of stitches
whereby said ring is permitted a limited yielding
of the number determined by the shape of the
angular movement with respect to the pulley, in
cam grooves 121 and 191. Such engagement of
order to cushion the shock of starting. The ring
218 has a shoulder 288 adapted to be engaged 20 the end 388 of the bunter 299 by the stud 381
causes said bunter to be forced toward the right
by a clutch dog 281 pivoted at 288 to a hub 282
in Fig. 17, thereby rocking the shaft 385 in a
keyed to the shaft 18 and normally urged into
clockwise direction and moving the stop arm 289
engagement with said shoulder by a spring 283
into the position shown in full lines in Fig. 17
connecting said dog with an arm 284 ?xed to
said hub. The dog 281 is formed with a stop 25 to disengage the clutch and stop the machine.
The stud 381 is preferably notched, as indicated
arm 285 adapted, when the connected parts are
at 382 in Fig. 11, so that the slight overthrow
rotated in the direction of the arrows on Figs. 19
of the parts incidental to stopping the machine
to 21, to engage a head 281 yieldingly mounted
will bring said notch opposite the end of the
by means of a spring 288 in the end of a stop
arm 289 when the latter is in the position shown 30 bunter 299 (Fig. 16) in order to permit the ma
chine to be again started by operation of the
in full lines in Fig. 17, thereby disengaging the
treadle.
‘
dog 281 from the shoulder 288 as shown in Fig.
The bunter 299 is normally drawn by a spring '
20, and stopping the rotation of the shaft 18,
384 into the inoperative position shown in Fig.
the shock of stopping being cushioned by the
spring 288. Recoil of the shaft under the in 35 18 out of the path of movement of the stud 381.
thereby permitting the continued operation of
?uence of the spring 288 is prevented by a pawl
the machine after one complete rotation of the
288 normally urged into a position to be engaged
cam 129, until raised into its operative position
by a shoulder 291 on the hub 282 by means of
a spring 292. The arm 289i is formed with a cam
by the following mechanism: Pivoted as at 389
surface 293 which cooperates with a plunger 294 40 (Figs. 17 and 18) to the frame member 159 is
a bell crank lever having one arm 318 in engage
slidably mounted in the frame and engaging the
ment with a vertically sliding plunger 31 1 guided
pawl 298. The arrangement of the parts is such
in said frame member and adapted, when raised.
that, when the stop arm 289 is in the position
to lift the bunter 299 from the inoperative posi
shown in dot and dash lines in Fig. 17, the head
281 is out of the path of movement of the arm 45 tion shown in Fig. 18 into the operative position
shown in Fig. 17. The other arm 312 of said
285 of the dog 281, permitting the latter, under
bell crank lever engages a cam or eccentric 313
the in?uence of the spring 283, to engage the
formed on' the hub of the gear 163 and cam 182.
shoulder 288, as shown in Fig. 21, thereby con
The cam and gear assembly 182, 163, 313 makes
necting the pulley 11 and hub 282 for rotation in
unison in the direction of the arrows. The cam 50 one complete rotation to two completed rotations
of the cam shaft 18 and main earn 129. and the
surface 293 at the same time acts through the
eccentric 313 is so arranged that at the comple
plunger 294 to hold the pawl 298 in the inop
tion of one rotation of the cam 129 the bell crank
erative position shown in Fig. 21. When the stop
318, 312 and plunger 311 will be in the positions
arm 289 is in the position shown in full lines
in Fig. 17, the head 281 will be engaged by the 55 shown in Fig. 18, but at the completion of a sec
ond rotation of the cam 129 said parts will be
stop arm 285 to disconnect the parts and stop the
in the position shown in Fig. 17, thereby lifting
machine, as above described. The cam surface
the bunter 299 into operative position and caus—
293 at this time permits the plunger 294 to be
ing the stopping of the machine upon the com
forced back by the spring 292, thereby permitting
said spring to move the pawl 298 into operative 80 pletion of said second rotation.
Referring to Figs. 1, 30 and 45 to 49, the ten
position for engagement by the shoulder 291, as
sion device 85 comprises two oppositely dished
shown in Fig. 19.
resilient disks 358 and 351 mounted on a rod 352
The stop arm 289 is secured, as by a set screw
guided
for longitudinal movement in a bushing
381, (Fig. 19), to a rock shaft 385 journalled
in the frame and having secured thereto at the 55 353 having an enlarged and recessed upper end
upon which the lower disk 358 is supported, said
exterior of the casing an arm 388 (Figs. 1, 15
bushing being in threaded engagement with the
and 16) connected by a chain 295 (Fig. 1) with
top of the head 11, whereby its vertical position
a suitable treadle (not shown), said arm being
thereon can be adjusted, and being secured in
preferably provided with a spring pressed posi
tioning plunger 298 adapted to engage either one 70 adjusted position in the latter by a lock nut 354.
At its upper end the rod 352 is formed with a
of the two recesses or depressions ‘291 (Figs. 1
head 355 between which and the upperdisk 351
. and 16) in the outer wall of the casing, thereby
is interposed a spring 355. Intermediate its ends,
releasably retaining the stop arm 289 in either
between
the dished portions of the disks 358 and
of the two positions shown in Fig. 17. To start
351,
the
rod 352 is formed with an enlargement
75
the machine, the treadle is depressed. thereby
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