вход по аккаунту


Патент USA US2113969

код для вставки
April 12, 1938.
Filed May 27, 1957
’ 2 Sheçts-Sheet 1
April 12, 1938.
H. wlalssMANN>
Filed May 27, 3.93"?>
2 Sheets-Shea# 2 »
Patented Apr. 12, 1938
Henry Weiss-mann Stapleton, Staten
Application May 27, 1937, Serial No.- 145,014
4 claims. (Cl. 112-191)
This invention relates to new »and useful im
provements in the bobbin mechanism of a sew
ing machine.
'I'he invention has for an object the construc
5 tion of a bobbin mechanism which is character
f1 AQ
ized by a'bobbin container for the thread, an
annular gear around said container ‘and rota
tively supported at its edges for supporting'the
container, and a novel arrangement for per
mitting the top thread loop passing around the
bobbin to interengage with the bobbin thread.` .
Another object of the invention is the con
struction of a device as mentioned which is sim
ple and durable and which may be manufactured
and sold at a reasonable cost.
For further comprehension of the invention,
and of the objects and advantages thereof,l ref
erence will be had to the following description
and accompanying drawings,'and to the appended
claims in which the various novel features of the
invention are more particularly set forth.
In the accompanying drawings forming a ma
terial part of this disclosure
Fig. 1 is a side elevational view of a machine
constructed according to this invention.
Fig.` 2 is a fragmentary enlarged elevational
view looking in the direction of the line 2-2 of
Fig. 1.
Fig. `3 is a sectional view .taken on the line
3-3 of Fig. 2.
Fig. 4 is a side elevational view of the bobbin
container per se, with the thread loop schemati
cally applied.
Fig. 4a is a fragmentary horizontal sectional
view taken on the line 4a of Fig. 4.
Fig-` 5 is a sectional view taken on the line 5_5.
of Fig. 2.
Fig.`6 is a sectional view of a bobbin container
constructed according to another form of the
Fig. 7 is a‘transverse sectional view similar to
Fig. 3 but illustrating another formof the in
vention, a simpliiied form.
VIn Fig. 1 a standard sewing machine III is
illustrated having the customary cast base plate
I’0a, the wheel drive I 0b, the needle bar I 0c,
and the pressure foot IUd. The details of this
sewing machine will not be given in this speci
ñcation since they >form no part of the invention.
The invention resides in the provision of a
bobbin container II formed with a passage IIa
for the thread. An annular gear I2 is‘ mounted
around `the container and has the root I2a be
tween ‘a pair of' adjacent gear teeth cut deep
(see Figs. 2 and 4a.). Top-thread loop catch
ing hooks I3 and Il are mounted on the con
tainer II at the sides of the gear I2 to guide the
loop of thread I4' into the cut I2a of the gear
I2 (see Fig. 4).~ Three rotatively supported
pinions I5a, I5b and I5c have flanges I5 en- 5
gaging the sides'of the gear for rotatively sup
porting the same. 'I'hese flanges are formed
with peripheral cuts I5' synchronized to align
with the cut I2a in the gear I2 to pass said
thread loop during the rotation of the gears. `
The bobbin container Il comprises a base por
tion IIb having a central projection IIc on
which a bobbin Ild is rotatively supported. A
cover IIe engages over the top of the base por
tion and is removably supported in position by 15
a peg II f engaging into an opening in the pro
jection IIc. The space IIa occurs between the
peripheral edges of the body IIb and the cover
IIe. The cover may be removed to replace the
The annular gear I2 is attached to the top
portion of the container body IIb.
The thread ~
catching hook I3 is soldered or brazed to the
top face of the gear I2. The thread catching
hook I4 is disposed immediately below and is
formed by a projecting end of a strip I la. which
is soldered or brazed upon the container and
extends in a helical band and constitutes a cam
for the purpose hereinafter described.
The pinion gear I5a is rotatively supported in ` 30
a bracket I1 which is attached to the underside
of the base Illa. The pinion I 5b is supported
on a bracket I8 similarly supported. The pinion
I5c is supported on a bracket I9, also similarly
supported. One of `the pinion gears, the pinion 35
gear |511, is driven and synchronized with the
sewing machine. This pinion gear is mounted
on a shaft 20 which is`provided with a bevel
gear 2I meshing with a gear 22 on a rotatively
supported shaft 23 connected by gears 24 with 40
a shaft 25 extending upwards into the body of
the sewing machined and connected With‘some
rotating part thereof. The details' of this con
nectionare not shown on the drawings as they
form no part of the invention. The connection 45
should be such that -the bobbin container II is
caused to rotate two complete revolutions for
each cycle of the needle bar IIJc.
Certain mechanism is provided for assisting
the top thread loop I4' to engage around the
bobbin container II. This mechanism includes
the cam strip Ila which tends to guide the
thread loop downwards over the bottom face
of the bobbin container. This mechanism also
includes an arm 28 which is pivotally supported 55
at its outer ,end on a bracket 29 attached on
the base I 0a. A pintle 30 is used for the pivotal
supporting. A spring 3| is coaxial on the pintle
and acts between the bracket 29 and the arm
28 for normally urging the arm upwards. A
member 32 is mounted on the arm 28 -and ex
tends under the cam I4a (see particularlyFig. 3)
in a manner so as to pivot the arm downwards
as the bobbin container turns. 'I'he free end
10 28' of the arm 28 is adapted to engage into the
loop of the top thread as it is formed by the
needle and to move the loop downwards (see
been disclosed. This form is a preferred one.
Essentially, it consists of a bobbin container II'
of comparatively shallow. depth and formed with
a passage II a for the thread. Y An annular gear
I2' is mounted around the container II’ and is
substantially of the same width as the depth of
the container- II'. The gear I2' has one root
between a pair of adjacent gear teeth cut deep,
indicated by numeral I2a. This deep cut root
I2a is synchronized with the cuts I5' on the 10
flanges `I5 of the supporting gears which support
the gear I2 in the identical manner previously
described. These same parts are indicated in
Fig. 7 by the same reference numerals used in the
Fig. 4) so as to help maintain the thread of the
loop to extend along the cam strip I4a.
The cam strip Ila extends substantially one
prior disclosure.
half of the circumference of the bobbin container
Mounted on the gear I2’ at the deep root cut
and then the member 32 drops off the end of the location I2a there is a top hook I3. This hook is
cam and is snapped upwards to its original posi
above a bottom hook I3a. This bottom hook I3a
tion, indicated by the dot and dash lines 28a in is substantially at the same position as the bot
20 Fig. 5. 'I'here is a small projection 33 on the tom face of the container II’.
body of the bobbin container I I immediately above
The container II’ is illustrated with a remov
the end of the cam I4a to prevent the loop thread ‘ able cover IIe and houses a bobbin IIdd. In
from slipping back over the bobbin container. other respects this form of the invention is
'I'he loop thread is now more than half way identical to the previousform and the correspond
25 around the container and as the gear I2 turns
ing parts may be recognized by the same refer
and the loop is drawn upwards it will finish its ence numerals, except for the fact that it lacks
circling act.
the cam strip Ida, the arm 28, and the other
'I'he machine base Illa is formed with openings associated parts for guiding the thread around
in its top face which are closed by conventional
30 slides 34. It is also provided with a plate 35 the container. This form of the invention does
not need the guiding means since it is of a nar 30
for the feeders 36. This plate has an opening 31 row enough width for the thread to engage around
for the needle 38 of the sewing machine to en
the container by itself.
gage through. The feeders 36 are operated in
The operation of this form of the device is as
the usual manner and so is the needle.
In Fig. 6 a modiñed form of bobbin container
The top thread which is carried down by the 35
is disclosed which comprises a container 4I hav
needle 38 forms a loop I 4' which is picked up
ing a top cover 42 engaging into the top thereof. simultaneously by the two hooks I3 and I3a.
This cover has a central opening 43 through which 'I'hen a portion of the loop falls into the root I2a.
the thread 44 from the bobbin 45 may pass. The As the container II’ rotates the loop I4' will be
40 container 4I is provided with the gear I2. In
drawn over theentire container II' and catch 40
other respects this bobbin container is identical the thread o'f the bobbin.
to that previously shown and its position and
While I have illustrated and described my
operation are the same.
invention with some degree of particularity, I
The operation of the device is as follows:
realize that in practice various alterations therein
When the needle 38 reaches its lowermost po
may be made. I therefore reserve the right and 45
sition and then starts to travel upwards, the top privilege of changing the form of the details of
thread in the needle is slightly looped.- The loop construction or otherwise altering the arrange
catching hooks I3 and I4 catch this loop I 4’ and ment ofthe correlated parts without departing
drop a portion of it'into the deep cut root I2a from the spirit or the scope of the appended
50 between a pair of the teeth of the gear I2. The claims.
bobbin container II is being turned by the drive
Having thus described my invention, what I
which connects with the pinion gear I5a. The claim as new and desire to have secured by
flanges I5V have niches t5' which are synchro
United States Letters Patent is:
nized with the root I2a to permit the thread to
1. In a sewing machine, a bobbin container with
55 pass the ñanges of each of the pinion gears as
a passage for the thread, an annular gear around
the bobbin container II turns. The lower portion said container and having the root between a pair
of the thread loop I4’ guides along the cam I4a of adjacent gear teeth cut deep, top thread loop
and the loop I4’ is also caught by the end of the catching hooks mounted on said containe';~ at the
arm 28 which moves it downwards at the same
sides of said gear to guide the loop into said cut
60 rate as the pitch of the cam strip Ila so that
of said gear, rotatively supported pinion gears 60
the loop extends along the said cam strip I4a. meshing with said gear and havingl flanges en
'I‘his cam strip guides the loop to the bottom of gaging the sides of said gear and rotatively sup
the bobbin container and so the loop extends com
porting same, said flanges having peripheral cuts
pletely around the bobbin container and catches synchronized to align with said cut in said gear
65 the bobbin thread. The arm 28 is moved down
to pass said thread loop during rotation of said
wards by the member 32 engaging the cam Ida, gears.
and when the member 32 is dropped the arm 28
2. In a sewing machine, a bobbin container with
will move back to its original position and be a'passage for the thread, anrannular gear laroundV
ready for the next thread loop. This arm will said container and having the root between a pair
70 be moved downwards again when the bobbin con
of adjacent gear teeth cut deep, _top thread loop
tainer II reaches its initial position, since then the catching hooks mounted on said container at the
finger 32 will again engage beneath a portion sides of said gear to guide the loop into said cut
of the cam strip I4a which will again move it of said gear. rotatively supported pinion gears
meshing with said gear and having flanges en
In Fig. 7 a simplified form of the invention has gaging the sides of said gear and rotatively sup 75
' 2,118,969
porting same, said ñanges having peripheral cuts
synchronized to align with said cut in said gear
to pass said threadloop during rotation of said
gears, said container being much deeper than
the depth of said gear, a spiral cam along the
side of said container and connecting with one
of said hooks for guiding the thread loop around
ing much deeper than the depth of said gear,
a spiral cam along the side oi' said container and
connecting with one of said hooks for guiding
the thread loop around said container, and a
follower resiliently supported and moved by said
cam and engageable with said thread loop for
guiding the thread ~loop of said cam.
3. In a sewing machine, a bobbin container
10 with a passage for the thread, an annular gear
4. In a sewing machine, a bobbin container
with a passage for the thread, an annular gear
around said container and of a substantial width 10
in relation to the width of said container, ro
and rotatively supporting same, said flanges hav
ing peripheral cuts synchronized to align with
20 said cut in said gearto pass said thread loop
loop between a pair of teeth of said gear and
then around said bobbin container.
said container. .
around said container and having the root be
tween a pair of adjacent gear teeth cut deep, tatively supported pinion gears meshing with
top thread loop catching hooks mounted on said l said gear and having ñanges engaging the sides
container at the sides of said gear to guide the of said gear and rotatively supporting same,
means for driving oneL of said pinion gears, and 15
15 loop into said cut of said gear, rotatively sup
ported pinion gears meshing with said gear and top thread loop catching hooks superimposed and
having iianges engaging the sides of said gear on opposite sides of said gear for catching the
during rotation k'of said gears, said container be
top thread looped by the needle and guiding said
Без категории
Размер файла
497 Кб
Пожаловаться на содержимое документа