close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2410400

код для вставки
Get. 29, 19:46., _
A;
WOOD
THREAD CONTROLLING DEVICE
Filed June '15, 1945
2,410,400
Patented Get. 29. 1946
UNiTED “STATES PATENT OFFICE
2,410,400 '
THREAD CONTROLLING DEVICE
Alfred R. Wood, Bridgeport, Conn, assignor to
The Singer Manufacturing Company, Eliza
beth, N. .F'., a corporation of New Jersey
Application June 15, 1945, Serial No. 599,584
5 Claims. (01. 112-247 )
1
This invention relates to sewing machines and
more particularly to an improved device for con
trolling the sewing machine needle-thread.
2
of this flange are inclined upwardly toward a
thread-slot it provided longitudinally of the post
More speci?cally this invention relates to slack
thread controlling devices and it has for an ob
ject to provide an improved means affording a
l2. By thus inclining the faces 15, a thread may
be more easily introduced into the slot it. Mount
ed upon the post I2 is a spring-abutment collar
ll which may be vertically adjusted by means
more sensitive and accurate control over the nee
of the screw I8.
.
_
dle-thread.
Con?ned between the collar ii and the flange
Another object of the invention is to provide
M is a check-spring Ill, the lower end portion
needle-thread controlling mechanism which may 10 of which embraces a thread-engaging collar or
be readily adjusted and easily threaded.
guide 213. The spring l9 may be soldered or other
With the above and other objects in view, as
will hereinafter appear, the invention comprises
the devices, combinations ‘and arrangements of
parts hereinafter set forth and illustrated in the
accompanying drawing of a preferred embodi
ment of the invention, from which the several
features of the invention and the advantages at
tained thereby will be readily understood by those
skilled in the art.
Fig.7 1 is a left side elevation of a sewing ma
chine bracket-arm head embodying the inven
tion.
Fig. 2 is a fragmentary front elevation of the
bracket-arm head.
Fig. 3 represents an enlarged sectional eleva
tion of the thread-controlling mechanism; the
section being taken substantially along line 3-~3
wise secured to the collar 20. The post I? is
formed with four substantially ?at faces 2i for
the purposes of reducing friction between the
post l2 and the spring and collar assembly l9
and 29.
-
>
In order to avoid nipping the thread between
the flange Ill and the collar 20 during the opera-V
tion of the device, the ?ange has been provided
20 with 'the upwardly extending portions 22 which
prevent the collar 2c from seating in a ?ush re
lation with the remainder of the ?ange, thus to
provide adequate clearance space for the thread.
To properly operate the present improved de
vice, the needle-thread 23 is brought from its
usual supply source, not herein shown, to be ?rst
threaded through the ironing guide 24 from
whence it is led between the tension disks 1 and
8. From the tension device 5 the thread is car
of Fig. 1.
Fig. 4 represents a cross sectional view of the 30 ried up over the stationary guide-wire 2.5, through
thread controlling device taken substantially along
the thread-slot l6 and then successively about the
line 4-4 of Fig. 3.
guide-wire 26, through the take-up eye 21, through
In the speci?c embodiment of the invention
the guides 28 and 29, and ?nally through nee
chosen for the purposes of the present disclosure,
dle-bar eye 36 to the needle ll.
1 represents a sewing machine bracket-arm which 35
A wire guard 3| is preferably positioned to ex
terminates in the hollow bracket-arm head 2 in
tend about the lower portion of the thread-check.
which is journaled the usual reciprccatory nee
As may be best seen from Fig. 1, the thread
dle-bar 3. The lower end portion of the needle
guides 25 and 26 vare positioned at opposite sides
bar carries the usual needle ll and the upper por
of the thread-check and at points abovethe nor
tion thereof has a take-up arm 5 associated there 40 mal or extended position of the thread-check, so
with.
that each guide will position the thread carried
Mounted upon the bracket-arm head 2 is the
thereby at an acute angle to the axis of the
usual releasable type tension unit 6 having the
thread-check.’ As the thread is thus positioned at
spring biased disks 7 and 8.
an acute angle relative to this axis, it will be
Secured to the head 2 by means of a screw 45 readily understood that little tension will be re
9 is a mounting bracket H) which is provided
quired in the thread in order to raise the collar
with an aperture II for slidably receiving a verti
29 against the spring 19.
cally depending post 12 of the present improved
It is the purpose of the present thread-check
thread controlling device or thread-check. A
to function as an auxiliary needle-thread take
screw l3 provides for vertical adjustment of the 50 up in that it is adapted to take up any slack
post I2 within the aperture I l.
thread which the take-up arm 5 is unable prop
This thread-check comprises the post l2 of
erly to control. In order to accomplish this func
which the lower portion is provided with a split
tion, the spring [9 must apply substantially less
two-part circular abutment flange or stop Ill-Ill.
tension upon the thread than does the tension
The face portions or thread-guiding means |5-—l 5 55 unit 6. Therefore, whenever the take-up arm 5
2,41 0,400
3
4
tioned at the slotted end of said post, a thread
engaging element freely slidable endwise of said
post, a stop associated with the slotted end of
the post, and a coil spring carried by said post
for urging said thread-engaging means toward
said stop.
3. A yielding thread-guide for sewing machines
comprising a mounting means, a post having one
end portion thereof carried by said mounting
pulls thread through the tension unit 5, it must
exercise more than enough tension on the thread
to raise the collar 2;} against spring 19. There
after in the event that the take-up 5 permits any
slack to exist in the thread, the elevated collar
29 will descend under the action of spring 19 and
control the thread. As the spring [9 is rela
tively long as compared to its diameter, it will
exert a substantially constant tension upon the
thread throughout the entire range of the unit; 10 means and being provided with a transverse
thread-slot extending longitudinally through the
which range is governed by the relative‘ vertical
spacing between the lowest position of ‘the collar
20 and the thread-guides 25 and 25. This spac
ing may be varied by adjusting the post 12 with
in the bracket it. The tension of the spring i3
may be varied by adjusting the collar i? along
the post i2.
' other end portion of said post, thread-guiding
means associated with said thread-slot and posi
tioned at the slotted end of said post, a collar
adjustably' secured to the post adjacent the
mounted end thereof, a stop carried by the slot
ted end of said post, a, thread-engaging collar
freely slidable on the post, and a coil-spring posi
tioned‘ between said collar and said thread
engaging collar for urging the latter toward said
,
It Will be readily understood that the present.
reciprocable thread-check will permit a greater
amplitude of thread movement without appre
ciably increasing the tension in the thread than
stop.
4.111 a sewing‘ machine, in combination, a
if the usual type of short torsion spring were
used.
It ‘will be seen that the present device com
prises an e?ective unit for controlling a needle- 0
thread in cooperation with the usual tension
and take-up devices. Furthermore, vthe present
device is of simple construction, inexpensive to
manufacture and it may be readily installed on
the standard type of sewing machine.
Having thus set forth the nature of the inven
tion, what I claim herein is:
l. A‘ yielding thread-guide for sewing ma
chines comprising amountingmeans, a post hav
ing one end portion thereof carried by said
mounting means and being provided with a
transverse thread-slot extending longitudinally
through‘the other end portion of said post, a
thread-engaging element'freely slidable endwise
engaging member downwardly.
‘ of said post, a stop associated with the slotted end
of the post, and spring means carried by said
post for urging said thread-engaging means
~ toward said- step.
2; A yielding thread-guide for- sewing machines
comprising a mounting means,- a-post having one
endpo'rtion thereof carried by said’ mounting
means and being provided with ya transverse
thread~slot extending longitudinally through the
reciprocatory thread-carrying needle, a needle
thread take-up, a needle-thread tension device
disposed at the thread-supply side of said take
up, a vertically depending post having a longi
tudinal thread-guiding slot open at the lower end
of the post, a thread-engaging member con?ned
for movement lengthwise of said post and dis
posed for engagement by a portion of the needle
thread extending from said tension-device to said
take-up, and an elongate coil-spring con?ned by
said post and yieldingly biasing said thread
45
1
5. In a sewing machine, in combination, a
reciprocatory thread-carrying needle, a needle
thread take-up, a needle-thread tension device
disposed at the thread-supply side of said take
up, a vertically depending post having a longi
tudinal thread-guiding slot open at the lower end
of the post, a thread-engaging member con?ned
for movement lengthwise of said post and dis
posed for engagement by a portion of the needle
thread extending from said tension-device to
said take-up, an elongate coil-spring con?ned by
said post and yieldingly biasing said thread
engaging member downwardly, and-stop means
limiting downward movement of said threads
‘other end portion of said-post,- thread-guiding
engaging member.
means associated with said thread-slot and posi
r
r
‘
ALFRED RqWOOD.
‘
Документ
Категория
Без категории
Просмотров
0
Размер файла
345 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа