close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2121652

код для вставки
June 21, 1938.
'
'
HfE. COOPER
2,121,652
TAKE-UP MECHANISM FOR sswme MACHINES
Filed Jan. 25, 1937
‘luv 14
J62
10
20
'
‘
'/ £6
v
/
I m
Patented June 21, 1938
‘ 2,121,652
(1
UNITED STATES PATENT OFFICE‘
2,121,652
TAKE-UP MECHANISM FOR SEWING
MACHINES
Harold Edmund Cooper, Kettering, England, as
signor to United Shoe Machinery Corporation,
V a
Paterson, N. J., a corporation of New Jersey
Application January 23, 1937, Serial No. 122,003
in Great Britain February 5, 1936
7 claims; (01. 112-57)
5
This invention is concerned with improvements
in or relating to sewing machines and is particu
larly, but by no means exclusively, concerned
with improvements in or modi?cations of rotary
take-up mechanism of the kind described in U.
5. Letters Patent to Keall et al., No. 1,941,943,
dated January 2, 1934, to Gouldbourn et al. No.
2,056,670 dated October 6, 1936, and to Gould~
bourn et al. No. 2,049,369 dated July 23, 1935
which includes a thread engaging member moved
during the machine cycle, at one time to pull the
thread and at another time to give ‘up thread,
in a continuous closed path which is not a circle.
In a high speed machine constructed as dis
16 closed in Patent No. 2,056,670 and modi?ed as
in Patent No. 2,049,369 and having a rotary take
up of the kind above referred to, the rotary take
up mechanism operates during the machine cycle
to give up needle thread while a loop of needle
,5,
tary take-up mechanism a yield which is effective
at the time in the operation of the machine when
the loop of needle thread is acting to pull the
shuttle thread hard against the work just prior
to the actual setting of the stitch, which yield ’*
then acts to minimize any snatch with which the
loop of needle thread may be pulled downwardly
by the take-up device due to the sudden resist
ance o?ered by the work to the continued down
ward movement of the needle loop. In its broad
er aspects, thev invention is not limited to use
with a continuously rotating take-up mechanism
in a lockstitch sewing machine of the kind re
ferred to, but is applicable for use with other
forms of take-up mechanism and in other types '15
of sewing machines.
-
'
In order that the nature of the present inven—
tion may become more clear, the illustrative em
bodiment aforementioned will now be described
20 thread is passing over the shuttle and then pulls in connection with the accompanying drawing. an
the loop of needle thread passed over the shut
In the drawing:
tle down to lay the shuttle thread which it
Figure 1 shows in right side elevation a form of
straddles on the Work and thereafter pulls the take-up embodying the present invention as ap
loop of needle thread into the work to set the plied to an outsole stitcher; and Figure 2 is a
25 stitch. During operation of such a machine
sectional view on the line 11-11 of Figure l.
as
there sometimes occurs breakage of the needle
The form of rotary take-up device illustrated
thread, particularlywhen a waxed needle thread in the drawing will be described as applied to a
is being used, near to the upper surface of the lockstitch outsole stitcher generally similar in
work and close to that portion of the loop of operation to the machine described in the pat
30 needle thread which actually engages the shut
ents above referred to. This machine is pro :30
tle thread when the needle loop is pulled down, vided with a curved hook needle 10, a lcoper l2,
to set the stitch by the rotary take-up.
a thread lifter l4, a shuttle l6, a thread ?nger
The more frequent breakage of waxed needle
It, a Work support 20, and a presser-foot 22. In
thread at this time in the operation of the ma
the illustrative embodiment there is rotary pin
35 chine is due, to some extent, to the fact that ion 24 movable bodily in a circular, path similar
when thread has been waxed the‘ thread becomes to that ‘indicated at 69 in U. S. Patent No. 1,941,
somewhat brittle and is therefore liable to break 943, and a disc 26 similar to that indicated at 75 in
under a sudden strain and further, owing to the the latter patent. The pinion 24 and the disc 26
comparatively high speed at which the machine are, in the present illustrative embodiment not
40 operates, to the fact that the rotary take-up
secured together in the manner disclosed in U.
pulls the loop of needle thread very rapidly down 5. Patent No. 1,941,943, but can move relatively
towards the work with the result that the sudden about the rotary axis of the pinion 24 by rea
resistance offered by the work to the continued son of a yielding connection between the pinion
downward movement of the loop, after the shut
and disc. The pinion 24 in the illustrative em
" tle thread has been laid upon the work, causes
the needle thread to break.
One of the several objects of the present inven
tion is to prevent, during the operation of a sew
ing machine having a rotary take-up mechanism
bodiment is secured on a hollow spindle 28'ro
tatably mounted in a casing 29, similar to that
indicated at 61 in the patent last referred to, in
place of the pin indicated at ‘H in said patent.
The hollow spindle 28 has formed on its right
hand end, viewing the rotary take-up mechanism
of the kind referred to, breakage of needle thread
from taking place in the manner aforesaid, as
will hereinafter appear from the following de~
scription. The above and other objects are
sought to be achieved in an illustrative embod
about one quarter of an inch thick, about seven
iment of the invention by providing in the ro
eighths of an inch in width, and about one inch
from the front of the machine, a head or block
39. The head 30 is substantially in the form of
a rectangle with rounded ends, the head being
2
,
2,121,652
and a quarter in length. The opposite sides of
the head are bevelled off slightly to form faces
as shown at 3|, 3| from the middle of the head
towards its opposite ends so that the angle sub
tended between the opposite end portions of each
side is some 175 degrees, the opposite ends of the
head being therefore somewhat narrower than
the middle portion.
The disc 26 of the present illustrative em
10 bodiment, which is the counterpart of that re
ferred to as 15 in the latter patent carriesa
thread engaging take-up roll 32 mounted eccen
trically to the spindle 28 similar to the roll indi
cated at ‘ll in said patent and has extending
15 from the centre of one side face of it a pin 34
which enters into a hollow of spindle 28 with
7 freedom for rotary movement therein.
Formed
in the side of the face of the disc 26 from which
the pin projects (1. e., the side nearer the said
20 head) is a recess 35 which receives the afore
said head 30 on the hollow spindle 28, the width
of the recess being equal to that of the widest
part of the head on the hollow spindle. The,
recess 36 in the disc is rectangular and the pin
25 34 which projects from the disc passes through
the mid-portion of the recess. As will have been
seen in Figure l, the end portions at the opposite
sides of the head on the aforesaid hollow spin
dle 28 are so bevelled off that a small amount,
:30 about ?ve degrees, of relative rotary movement
may take place about the axis of the hollow spin
dle 28 between the head 30 on the hollow spindle
and the disc 26 in which is the recess and which
carries the take-up roll 32, the amount of rotary
movement being limited between two positions by
contact of the opposite bevelled end portions of
the head with the opposite sides of the recess.
Due to the eccentricity of the roll 32 to the spin
?dle 28, rotary movement between the spindle and
40 disc causes the roll to move bodily relatively to
the rotary axis of pinion 24, the amount of
thread taken up by the roll being changed cor
respondingly. The pin 34 is prevented from end
wise movement in the hollow spindle 28 by a
pin 38 passing laterally through the hollow spin
dle and through a recess 40 in the pin 34, which
recess allows the relative rotary movement be
tween'the pin and spindle to take place.
To enable the take~up roll 32 to exert a yield
50 ing pull on the thread, the head 30 on the hol
low spindle has formed in it, at right angles to
its length, a closed bore which receives a com
pression spring 42. The spring 42 presses against
one side of the recess 35 in the disc 26 and tends
.55 to hold the disc at one end of its rotary move
ment relatively to‘ the head and thereforeyto
hold the take-up roll in ‘a normally ?xed posi
tion relatively to the hollow spindle.
The construction of the illustrative embodi
.60 ment has for convenience been described in con
nection with a rotary take-up mechanism like
that described in U. S. Patent No. 1,941,943, but
it will be understood that the illustrative em
65 bodiment may equally well be used in the similar
shown in Figure 50 of thedrawing of said Pat
ent No. 2,056,670.
During the time in the cycle of the machine
indicated by the dot-and-dash lines A in Figure
1 of the accompanying drawing during which
the take-up roll 32 is moving downwardly, as
shown in Figure 3 of the drawing of Patent No.
2,056,670 in which ?gure the take-up rotates in
aclockwise direction, and is drawing the loop
of needle thread which has been passed over
the shuttle down towards the work, preparatory
to the setting of the stitch, i.- e., during the move
ment of the take-up from about 280 degrees to
about 350 degrees in the diagram shown in said
Figure 50, the take-up roll 32 occupies a position
more rearward in the machine than the axis of
the disc 26 which carries the roll and while, dur
ing this time, the take-up rotates in a clockwise
direction, the take-up roll 32 is, besides being
carried bodily round by the take-up mechanism, 20
being rotated in a clockwise direction about the
axis of the disc, i, e., it is being carried towards
the forward side of the axis of the disc. During
this part of the movement of the take-up roll
the spring 152 in the head 30 on the hollow spin
2.5
dle
is inoperative and merely holds the disc
carrying the take-up roll at the limit of its coun
terclockwise movement about the axis of the
said spindle, its angular position relatively to the '
spindle being then determined by contact between
one of the bevelled faces 3i on the head 30 of
the spindle and one side of they recess 35 in the
disc 26 which carries the take-up roll. The ar
rangement is such that any resistance then o?ered
by the thread to the movement of the take-up 35
roll during this part of the movement of the
take-up roll tends to move the take-up roll in
a counter-clockwise direction about the axis of
the disc and to hold the said bevelled face on
the head more ?rmly against the side of the
recess with the result that the loop of needle
thread is pulled positively down towards the
work.
'
p
-
At the time when the take-up roll has just
pulled the loop of needle thread down and laid 45
the shuttle thread on the work which occurs at
about 350 degrees of rotation of the main shaft
of the machine from its initial position, the take
up roll 32 will havebeen advanced downwardly
and forwardly both by bodily movement of the 50
pinion 2% as the take-up mechanism rotates and
by movement of the roll 32 about the axis of the
disc 26 which carries'the roll into a position in
which upward pressure exerted on the roll, due
to the resistance o?ered to movement of the roll 55
by the tensioned thread, tends to move the take-.
up roll in a clockwise direction about the axis of
the said hollow spindle 28. The resistance of the
loop of thread to downward movement of the
take-up roll tends, by the consequent upward .60
reaction exerted on the roll, at this time, to cause
the disc 25 carrying the roll 32 to move in a
clockwise direction about the axis of the hollow
spindle 28 against the action of the spring 42
which normally urges the disc in a counterclock
rotary take-up mechanism described in Patent
wise direction aboutsaid spindle. The extent to
No. 2,056,670 and its operation will now be de
scribed in relation to a machine and take-up
mechanism as described in said. latter patent, in
which the thread handling and work feeding in
axis of the spindle is limited by contact of an
other of the bevelled'faces 3! on the spindle head
strumentalities (except in so far as the thread
handling instrumentalities are modi?ed in the
manner disclosed in Patent No. 2,049,369) op
erate at the approximate times in the machine
175 cycle described with reference to the diagram
65
which the disc can so move angularly about the
30 with a side of the recess 36 in the disc 26 and, 70
as before indicated, is approximately some ?ve
degrees. .During such movement of the disc rel
atively to the spindle, the take-up roll, which as
before stated vwill then lie at the forward side of
the axis of the spindle; will rise slightly (e. g.,
3
2,121,652
some as? of an inch) towards the work out of the
path, indicated at D, it would otherwise follow
and thus relieves to a small, but nevertheless
measurable, extent the tension exerted on the
thread at this time. Thus during a part of the
movement of the take-up roll when the'roll is
acting to set the stitch which part extends from
between about 350 degrees to 10 degrees in the
diagram, providing the machine makes more
10 than a complete cycle, the roll 32 can yield to
relieve any sudden tension on the thread against
the action of the spring in the head on thehol
low spindle. Before the roll reaches the posi
tion, indicated by the full lines B in Figure 1,
15 in which it actually completes the setting of the
stitch, however, the yield between the disc and
spindle will normally have been completely taken
up so that in completing the stitch setting the
roll pulls positively on the thread. After the
20 stitch has been set and the take-up mechanism
continues to rotate, the take-up roll gives up
needle thread to the thread handling instru
mentalities and during this thread giving-up
part of the movement of the take-up roll, indi
25 cated by'the dot-and-dash lines C in Figure 1,
such strain as was imposed on the thread during
the major portion of setting of the stitch is re
lieved and, if the take-up roll has yielded against
the action of the spring 42 in the head on the
30 hollow spindle, the spring once more rotates the
disc carrying the roll in a counterclockwise di
rection about the spindle and returns the roll to
its original position relatively to- the spindle.
‘There is thus provided a yielding means in the
35 take-up mechanism which is inoperative during
the greater portion of the pulling down of the
55
60
ing on the thread engaging member to permit a
limited bodily movement of the thread engaging
member about the axis of rotation of the rotary
member under the pull exerted on the thread
during the setting of a stitch.
4. A shoe sewing machine having, in combina 10
tion with the other stitch forming devices, a take
up comprising a rotary member arranged to move
bodily in a circular path, a thread engaging
member mounted eccentrically on said rotary
member, and means for rotating said rotary 15
member comprising a yielding connection per
mitting a limited rotary movement of said mem
ber under the pull exerted on the thread during
the setting of a stitch.
5. A shoe sewing machine having, in com 20
bination with the other stitch forming devices, a
take-up comprising a rotary driving member
arranged‘ to‘ move bodily in a circular path, a
thread engaging member mounted eccentrically
to the axis of rotation on the rotary driving 25
member, and a yielding connection for causing
the thread engaging member to exert a positive
pull on the needle thread while the resistance
o?ered by the thread tends to move the thread
engaging member in one direction about the axis 30
of rotation of the rotary member, and to exert
a yielding pull on the needle thread while the
resistance offered by the thread tends to- move
the thread engaging member in the other direc
35
tion.
6. A shoe sewing machine having, in combina
tion with the other stitch forming devices, a take
passed over the shuttle but may become auto
up comprising a rotary driving member arranged
matically operative substantially at the time when
50
ber mounted eccentrically to the axis of rotation
on the rotating member, and yielding means act
loop of needle thread after the loop has been
40 the loop lays the shuttle thread' ?rmly against
45
up comprising a rotary member arranged to move
bodily in a circular path, a thread engaging mem
to move bodily in a circular path, a thread en
gaging member, a spindle concentric with the 40
rotary member on which the thread engaging
member is eccentrically mounted for bodily move
ment relatively to the rotary member, means for
limiting the bodily movement of the thread en
gaging member between two positions about the 45
spindle relatively to the rotary member, the re~
sistance oifered by the thread tending to hold the
thread engaging member in one position while
the take-up pulls the needle loop towards the
work and in the other position while the take 50
up sets the stitch, and spring means for holding
the thread engaging member in the position as
the work and during the setting of the stitch,
which yielding means may then yield and thus
tend to prevent undue strain on and consequent
breakage of the needle thread and in which, at
a time when setting of the stitch is being com
pleted, the yield will normally have been taken
up so that the stitch is ?nally set by a positive
pull on the needle loop by the take-up roll.
The nature and scope of the invention having
been indicated, and a form of the invention hav
ing been described, what is claimed is:
1. A lockstitch shoe sewing machine having, in
combination with the other stitch forming de
vices, a take-up comprising a thread engaging
member, and mechanism for actuating the thread
engaging member to pull the needle loop from
the shuttle into the work and to set the stitch
comprising yielding means rendered inoperative
while the thread engaging member is pulling the
needle loop from the shuttle and rendered op
erative as each stitch is being set to relieve sudden
thread engaging member eccentric to the axis
60
of rotation of the rotary member, a spindle con
nected to the rotary member, a block on the
tension on the thread.
spindle formed with an end narrower than an
2. A lockstitch shoe sewing machine having, in
combination with the other stitch forming de
65 vices, a take-up comprising a thread engaging
member, and mechanism for actuating the thread
engaging member to pull the needle loop into the
work and to set the stitch including a spring for
causing the thread engaging member to exert a
70 yielding pull on the needle thread, and means
for limiting the yielding pull exerted by the
spring to insure that the stitch will ?nally be
set with a positive pull.
3. A shoe sewing machine having, in combina
75 tion with the other stitch forming devices. a take_
sumed while the take-up pulls the‘ needle loop
towards the work.
'7. A shoe sewing machine having, in combina
tion with the other stitch forming devices, a
take-up, comprising a rotary driving member
arranged to move bodily in a circular path, a
other portion thereof, a supporting disc for the
thread engaging member formed with a recess
loosely surrounding the block, the width of said
recess being substantially equal to the widest part
of the block to permit the disc to pivot about
the widest part of the block between positions
determined by engagement of the end of the
block with the sides of the recess, and spring 70
means acting between the block and the disk to
hold the thread engaging member yieldingly in
position relatively to the rotary member.
HAROLD EDMUND COOPER.
Документ
Категория
Без категории
Просмотров
0
Размер файла
589 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа