close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2105184

код для вставки
Jan. l1, 1938.A
`
,
s. M. cREwDsoN
-
2,105,184
uATTACHMÉNT FOR SEWING MACHINES Il
' Filed Feb. 28,
1935
*
2 Shee’cs--Shee‘tI l
@576\ i 75
' ||
v 1
j@ ȏ l IH HI i
-
:
IIIV’
"
1
415
_
0
ß
œ
.
Jan. 11, 1938.
s, M, CREWDSON
I
'
2,105,184
ATTACHMENT FOR SEWING MACHINES
Filed Feb. 28, 1935
‘
w
y
w
‘
_
61
@_
@3 ¿a
`
`
2 Sheets-Sheet 2
\
¿l .
@E 66
_Z6
_
Lag
‘
.11
„5055
.
J5
Z0
57 Ñ
v6559-
»
60
fnl/75%" _
h
Jara/ZM Crea/¿50m
@J
"@Ér;
Patented Jan. 1v1, 1938
5,1%
UNITEDST’AÍTES' PATH ortie
ATTACHMENYTJFOR SEWING MACHINES »
Sarah M. Crewdson, Chicago;` `Ill., assigner of
one-third to Robert H. Goedhart, Chicago, Ill. `
Application February 2s, 19735, serial No. »8,626
13 claims; _ (Cr.- 11a-_124)
The invention relates `to an attachment for
Figure 1 >is a plan view'of the attachment con- _ '
sewing machines and has for its object to pro
structed in accordance with the invention `and
vide an attachment that will triml a seam by cut
shown in association with the operating elementsy
ting the material to form either a straight edge of a` sewing machine;
"
Y
5 or an irregular edge at a predetermined distance '
Figure 2 is a side elevational view of the at
tachment of Figure l showing a pinking element
from the seam.
Another object of the invention is _to provide
'an attachment of the character described thatA
can be readily secured to-a sewing machine Vin
10 a plurality of adjusted positions with respect to
the needle to permit the operator to vary thev
distance of the severed edge from the stitching,
thereby cutting margins of variable widths.
Another object resides in the provision of an
attachment that will embody novel means for
operating the same from the reciprocating needle
with feed rollers cooperating therewith;
Figure 3 is a side elevational view of the at-tachment of Figure l, showing the operating
mechanism for connecting the rotary cutting ele 10
mentwith the sewing machine;
>
" '
Figure 4 is a bottom plan view of the attach
ment;
_
l
Figure 5 is a sectional lView taken-»substantially l
along line 5_5 of Figure 4 showing a pinking
element in contact with the feed roller and aprons
post of the sewing machine and which means will ‘ for directing the material into engagement there
synchronize the cutting element with the feed
with;
mechanism of the machine vso that the rate of
20 travel of the material through the machine will
be the same as that through the attachment. ‘
Another object of the invention is to provide
'
.
Figure 6 is a detail sectional view taken along
line 6_6 of Figure 2;
~
20
vFigure 7 isa detail sectional view taken along- .
line ‘l--l of Figure 5; and
‘
Figure 8 is a'sectional view similar to Figure 'l
an attachment such as described which will ac
commodate thin material and also heavier thick Y but showing a rotary cutting element in associa
material having resilient means for maintaining y tion with the feed rollers.
25
the proper pressure on the material during the I The present invention particularly relates to
cutting operation.
g
f
Another object of the invention is to provide
an attachment having a rotary cutting element
30 for severing the material on a straight edge and
which can be readily replaced by a rotary pinking
element when it is desired to trim the edge with
an irregular design.
improvements over the form of mechanism for
trimming seams shown in my copending appli
cation, Serial No. 743,642, filed September l12,
1934.'
t
Referring to the'drawings, the attachment has
been shown in associated relation with certain
operating parts of a sewing machine of the type
The invention also contemplates the'provision Y adapted for home use and which consists of a`
oí feed rollers for feeding the material through
the attachment and novel mounting means for
the lower feed rollers, whereby one of said rollers
is resiliently held in engagement with the cuttingV
work supporting surface li), a vertical recipro
cating needle post il carrying a needle i2, and
a‘ supporting post i3 having the foot Hl secured
thereto by the thumb screw l5 and >which holds
element for performing the cutting operation and
ment in one direction to provide a solid and un
the material to be sewed in contact with feeding
mechanism i6 of the sewing machine.- It is to
be understood that the supporting post I3 can
yielding surface for the pinking element.
be vertically reciprocated by the operator and is
40 which rollers may be locked against bodily move
A further object is to provide a sewing machine
attachment of improved construction having rub
45V ber surfaced feeding rollers for positively feeding
the material.
Y
ing the sewing operation, being lifted- by the
operator to remove the same from the material
at the end of the sewing operation.
»
With these and various other objects in view
the invention may consist of ' certain novel fea
tures of construction and operation, as will be
t 50` more fully described and particularly pointed out `
in thespeciñcation, drawings and claims append
ed hereto.
y In the vdrawings which illustrate an embodi
ment of the invention and wherein like reference
55 characters refer to >like parts--l
yieldin'gly held in contact with the material dur
'
'
’
The attachment essentially consists of a frame
member, Figure l, which includes'a vertical'sup
porting member I8, having an inclined working
surface 20'secured thereto. Extending‘ironi one
side- of the member l8‘is a boss 22 overlying but
being spacedfrom the working surface as `b-est
shown in Figure 6. Extending from the member
|-8 below the working surface are two spaced
> bosses 23, Figure 7, and 24, Figure 6, which bosses 5.5.
2
2,105,184
journal shafts to be presently described.
The
the cutting element at the proper speed. The
right angled strap members 25 and 26 are suitably
bolted to the lower portion of wall I8 and to the
invention also contemplates that the ratchet
wheel 34 may be` reduced in size and pivot 39 of
pawl 38 relocated to secure the correct speed of
surface 20, said strap members thereby support
ing said surface from the member. Adjacent the
base of said member and to the rear thereof is
provided a laterally extending foot portion 21
which extends for part of the distance of the
surface 20 to aid in supporting the frame in hori
10 Zontal position on the surface l0 of the sewing
machine.
Ul
The boss 22, Figure 6, journals a shaft 28 which
projects from the end of the boss for receiving
the washer 3B, the cutting element 3| and re
15
taining member 32, the parts being keyed and
held fixed to said projecting end of the shaft by
the bolt 33. The opposite end of shaft 28 pro
jects from the wall I8 to which end is fixedly
secured the ratchet wheel 34. Rotatably mounted
20 on the end of shaft 28 projecting beyond the
ratchet wheel is an operating arm 35 having the
stud 36 integral therewith and which is held on
the shaft by the bolt 31. The cutting element
may take the form of a pinking knife for cutting
an irregular edge or a cutting blade for severing
the material along a straight edge.
One end of the operating arm, Figure 3, has
the pawl 38 -pivoted thereto as at 39 and which
is> held in contact with the ratchet wheel 34 by
30 the coil spring 40. The other end of operating
rod 35 is bent at right angles forming an inter
mediate section 4|, shown in Figure 1, and which
section is further bent and turned downwardly,
forming the portion 42 having a recess for en
gaging the stud 43. Said stud has a knurled end
44 and is suitably secured to the reciprocating
needle post || of the machine.
From the foregoing it will be understood that
vertical movement of the needle post will oscil
40 late arm 35 to cause engagement of pawl 38 with
ratchet wheel 34, causing rotation of said ratchet
the cutting element.
The work supporting surface 2U is provided with
an opening directly below the cutting element 3|,
Figure 5. Part of this opening is closed by a rear
apron 50 which is suitably secured as at 5| to the
underside .of surface 20.
Forward of said open- .
ing there is provided a front apron 52 also suit
ably secured to the underside of surface 2l), the
free edge of said apron resting on the lower feed
rollers 53 to direct the material between said cut
ting element and the feed rollers. Said feed roll
ers are journalled in a yoke 54 by means of the
stud 55 passing through the arms of said yoke
and which stud at its inner end is cut away on its
lower side providing the flat surface 56, as shown
in Figure 5. The yoke 54 is provided with a shaft 20
51 which is journalled in boss 23 of the vertical
wall I8, the other end of said shaft extending be
yond the boss and receiving the coil spring 58
which is retained thereon'by the washer 59 and
bolt 60. The coil spring therefore yieldingly holds
the yoke in contact with the end of boss 23. The
shaft 51 however mounts the yoke within the
frame so that the same may have rotation, there- .
by supportng the feed rollers 53 for bodily move
ment in a direction toward and away from the 30
cutting element.
Movement of the feed rollers
in this manner is desirable as it is necessary that
the attachment accommodate thin, light material
as well as heavy, thick material, and in order to
apply the proper pressure on the material for :i
feeding the same, a resilient member 6| is pro
vided, said member having one end ñxed to sup
port 62 and its other end in engagement with the
yoke 54.
Y
By reason of the resilient member 6| the feed 40
rollers will be yieldingly held in contact with
wheel and shaft 28 in a counter-clockwise direc- ` the cutting element 3|.
tion, Figure 3. Rotation of the shaft'28 by the
reciprocating element of the sewing machine will
45 therefore rotate the cutting blade of the attach
ment. A locking dog 45 is provided, pivoted to the
wall at 46 and yieldingly held by spring 49 in
contact with the ratchet wheel, in ’order to pre
vent reverse rotation of said ratchet wheel. How
50 ever, the degree of oscillation of the arm 35 is in
excess of that required to rotate the cutting ele
ment in synchronism with the feeding mechanism
of the sewing machine, and accordingly the in
vention has provided means for disconnecting
However, for starting
Ythe material through the attachment it is desir
able that the feed rollers be located out of en
gagement with the cuttingrelement so that the
material may be easily positioned therebetween.
For accomplishing this a release lever B3 is pro
vided, Figure 3, having the stud shaft 64 secured
thereto, and which is mounted in the frame i8.
Said stud shaft has ñxed thereto on the opposite
side of the frame the arm 65, Figure 5. Said
armoverlies the projecting end of shaft 55 which
journalsY the feed rollers so vthat actuation of
lever 63 inA a direction to impart clockwise ro
pawl 38 from the ratchet wheel at the end of the Y tation to arm 65 will rock the yoke 54 in a dovm- ,
downward stroke of the arm. Said pawl -carries ward direction, moving the feed rollers out of I
at its extreme outer end the pin 41 and the wallY
I8 has suitably secured thereto an abutment 48v
which is adapted to engage the pin to throw the
60 pawl upward out of contact'V with the ratchet
Wheel. Thus the arm 35 has operative connec
tion with ratchet wheel 34 for only a part of its
downward stroke and by properly positioning
abutment 48 the throw-off pawl 38 can bev timed
65 so as to accurately synchronize the speed of rota
tion of the cutting element with the feeding mech
anism of the sewing machine so that just the
amount of material supplied- by the sewing ma
chine is fed through the attachment. It will be
contact with the cutting element. The cutting
element 3| contacts the periphery of the inner
feed roller and as the material passes between
these two elements the same is severed, forming
an irregular or pinked edgercorresponding with
the design of cutting element. For this opera
tion it is necessary to lock the feed rollers against
bodily movement as above described, since the
severing of the material by element 3| would be «
impossible if the feed roller could be depressed.
The locking means consists of an eccentric 66
understood that where it is possible to lengthen
the arm 35 by locating the attachment" further
carried by shaft 61 which is journalled in the
boss 24 on the frame. On the opposite end of
shaft', 61 is suitably threaded a knob having a
knurledportion 68Y and a collar 10 which is flat
to the rear of the needle that the throw-off for
tened for a portion of its periphery and against
the pawl can be dispensed with since under these
which rests the strip of spring metal 1|, Figure 3.
The supportingY Vstud 12 projects from the frame
' ward stroke of the arm will befnecessary to rotate» and'positions said metal strip so that pressure
conditions full engagement thereof for'the down
3
groener,
is' maintained on the 'collar`10 of the ïwheel to
prevent inadvertentv rotation of eccentric 66.
stud 8|, whichreceives the coilV spring 82 for
yieldingly holding the parts together. By means .
However, after the material has been located be
tween the cutting element and the `feed rollers
and it is desirable to lock the feed rollers against
ofthe pivotal relation between the parts of the
scale the foot I4 can be raised by the operator
bodily movement, the voperator v'grasps V'the
knurled portion 68 andtrotates shaft 61 andec
sewed Without detaching the part 15 of the scale
from the attachment. This operation is neces
sary when it is desired to raise the foot i4 for its
centric 66 until the same contacts vwith the flat
surface 56 oftheshaft 55. With the eccentric
10 in‘contact Vwith the‘ñat surface 55 of the shaft
it is impossible to move the feed rollers in' adi
rection downwardly and therefore said rollers
provide a ñrm kand unyielding surface` for the
cutting element.`
15
'
l
f
In addition to trimming seams with'J an ir
alimited extent to >adjust the material being
full height.
, ,
‘
Figures 1 and 2 show 'a guard`83 for protect
ing the fingers of the operator from contact with
the cutting element. Said guard is Vpivoted at 84
to a portion 85 secured to member iS. rlI‘he pivot
84 is provided with resilient means to yieldingly
maintain the guard in horizontal position with
the stop 8G in contact with the frame member as
pinking attachment 3l, the .present device is also v shown in Figure 6. This construction holds the
capable of trimming said seams on a straight guard in position for protecting the operator but
can be easily lifted when it is desired to remove
edge. The invention contemplates that the ele
regular design, which is accomplished by >the
20 ment 3l may be replaced by the upper feed roll-`
ers 53 and cutting blade 13. Figure 8 shows the
association of the: feed rollers with respect to
the cutting blade, it being understood that the
the cutting element from the attachment and
replace vthe same with a cutting element having
other and different characteristics.
,
Projecting from frame i8 is a rod 81, as shown
inFigure 1, to which is adjustably secured mem
ber 88, said member _being adapted to be held
in >position on said rod by tightening of the screw
ment 3l thereon. The yoke 54 has been pre
viously described as journalled in boss 23 in a ’ 90. 4The member forms a support for the mate
manner permitting axial movement against the . rialguide‘ SI. to assist the. operator in guiding
tension of the coilfspring 58. This construction the same from the needleof the sewing machine
has been provided in order to yieldingly hold' one to the cutting mechanism of they attachment. -“
In the operation of cutting the material por-V
of the lower feed rollers 53 against the sur
face of the cutting blade 13, asv shown in Figure tions thereof ñnd theirway between the lower
8. When the cutting blade is associated with feed rollers Y53. If the lint and scrap pieces
of material are not removed from between the
the feed roller in this manner the parts effec
tively perform a cutting operation, severing the feed rollers they soon interfere with the operation ‘
material with a clean cut forming a straight of the same. For this purpose the invention pro
vides a stripping finger 52, Figure 2, suitably
edge. `When thecutting blade hasbeen sub
stituted for the pinking element the locking, secured at one end to foot portion 21 having its
eccentric 66 is rotated to position the same »out free end located between the feed rollers 53. The
of Contact with shaft 55 so that the yoke and the ñnger is preferably of spring wire so that the 40.
same maintains its position between the feed
lower feed rollers have bodily/movement, be
ing yieldingly held in contact with the upper rollers, whereb-y the pieces of material and lint
feed rollers located on the respective sides of the are effectively removed.
The invention is notV to be limited to or by de
cutting- blade. As shown in Figure 8, said upper
feed rollers are equipped with rubber tires 14. tails of construction of the particular embodi 4.5. '
It is not absolutely necessary that the tires be ment thereof illustrated by the drawings, as vari
parts are keyed to the shaft 28 and retained
25 thereon by bolt 33 which likewise retains the ele
30
'
35
40
45
composed of rubber as any friction material will
function just as satisfactorily. rI“he main ob
ous other forms of the device will of course be
Yapparent to those skilled in the art without de
ject of surfacing the periphery ofthe upper feed parting from the spirit of the invention or the
rollers in this manner is to insure positive feed scope of the claims.
50:1
What is claimed is:
of the material through the attachment.
1. An attachment for sewing machines com
Í The attachment is held in' adjusted position
on the surface IB of the sewing machine by means prising a rotary cutting element, means opera
. of the scale 15 having graduations thereon and tivelylconnecting said element with a movable
member of the sewing machine, whereby said
55 being provided with an elongated slot 16. The
element is rotated by the action of the machine,
member I8 is reduced in height at the end ad
jacent the supporting post I3 and is provided
with a projecting screw 11 having the winged
nut 18 thereon, the screw extending` through the.
slot in the scale,'which is then held to the at
tachment by the winged nut. „The scale 15 ter
minates in the upwardly bent portion 19, Figure
2, to which is pivotally secured a bent member
35 which may be considered as a separable part
65 of the scale. Member 8@ is bent at one end to
form a U-shaped portion which is adapted to
overliethe secured portion of the foot I4 so
that the foot and member are releasably secured
to the supporting post i3 by the thumb screw
70 l5. When the separable parts of the scale are
rigid with each other vibrations from the sewing
machine are readily transmitted to the attach
ment and in order to reduce these vibrations to
a minimum the invention pivotally secures the
75 separable parts of the scale to each other by the
a scale adapted to be secured to a member' of the
machine and extending laterally with respect to»
the needle, means for adjustably securing the at-,
tachment to said scale, and means provided on the
scale for absorbing the vibrations of the sewing
machine whereby they are not transmitted to the
attachment.
2. An attachment for sewing machines com
prising a rotary cutting element, means opera 65
tively connecting said element with a movable
member of the sewing machine whereby said
element is rotated by the action of the machine,
a scale adapted to be secured to a member of the
machine and extending laterally with respect to 70
the needle, and means for adjustably securing
the attachment to said scale, said scale compris
ing two sections pivotally secured together where
by the vibrations of the sewing machine are not
transmitted to the attachment.
75
4.
2,105,184*
3. An attachment for Vsewing machines' com;
prising a rotary cutting element, means opera-v
tively connecting said element with a movable
member of the sewing machine whereby said
5 element is rotated by the action of the machine,
a scale adapted to be secured to a member of the
machine and extending laterally with respect to
the needle, and means for’adjustably securing
the other end of the scale to said attachment,
10 said scale having a yielding joint intermediate its
ends for absorbing the vibrations of the sewing
machine whereby they are not transmitted to the
attachment.
cutting element for performing a cutting opera
'
.
5. An attachment for sewing machines, com
25 prising a frame member, a shaft mounted for
rotation in said member and carrying a cutting
blade, a feed roller positionedV below said bladeV
and having association therewithto perform a
cutting operation, means journalling said roller,
30 said means being mounted for movement in the
frame in a direction parallel to the axis of the
roller, and resilient means biasing said mounting
means to maintain the cutting blade and rollerin contact.
6. An attachment for sewing machines, com
35
prising a frame member having a rotary cutting
element, a feed roller positioned below the cutting
element and having contact therewith for per
forming a cutting operation, means journalling
40>`the feed roller, a shaft carrying said means and
being mounted in the frame for movement in a
direction parallel to the axis of the roller, `and
resilient means on the shaft for biasing the
journalling means in a direction to'hold the feed
45uroller in contact with the cutting element.
7. An attachment for sewing machines, com
prising a frame member> having a rotary cutting
element, a roller positioned for contact with the
cutting element, means journalling said roller, a
öo-_shaft carrying said journalling means and being
mounted in the frame for rotation, resilient means
forcing the roller into Contact with the cutting
element, and a manually operable lever for holding
the roller out of contact therewith.
55
means to depress the same against the tension
of the resilient means.
,
9. An attachment for sewing machines, com
prising a frame member having a rotary cutting
element, a roller positioned below the cutting
element, a‘ yoke journalling the'roller and being
rotatably mounted in the frame, whereby said
roller is supported for bodily movement, resilient
means forcing the yoke upward to hold the
roller in contact with 'the cutting element, and a
lever adapted to be manually actuated forhold
4. An attachment for sewing machines, com
15 prising a frame member having a rotary cutting
element, a feed roller positioned below' the cutting
element, means journalling said roller and being’
mounted in the‘frame for movement in a direc
tion parallel to the axis of the roller, and means
20 biasing the mounting means in a direction to
hold the feed roller in engagement with the
tion.
contact with the cutting element, and a manually'
operable lever adapted to engage the journalllng
8. An attachment for sewing machines, `com-
prising a frame member having a rotary cutting
element, a roller positioned for contact with the
l cutting element, means journalling said roller, a'v
shaft carrying said journalling means and being
60 mounted in the frame for rotation, whereby said
roller is supported for bodily movement, resilient
means biasing said shaft to force the roller into
ing the roller out of contact with the cutting ele
ment.
‘
10. An attachment for sewingv machines, com
prising a frame member having a rotary cutting
element, a roller positioned below the cutting ele
ment, a yokejournalling the roller and being ro
tatably mounted in the frame, whereby said roller
is supported for bodily movement, resilient means
yieldingly holding the roller in Contact with the
cutting element, and a manually operable lock
for locking’the yoke preventing downward move
ment of-the'same.
l1.- An -attachment for sewing machines, com
prising a frame, a shaft journalled in the frame
and carrying a cutting blade, feed rollers fixed to
the shaft and positioned on the respective sides
of the blade, lower feed rollers located below the 30'
blade, a yoke journalling the lower feed rollers
and being rotatably mounted in the frame, where
by said rollers are supported for bodily movement,
and resilient means biasing the yoke to yieldingly
hold the lower feed rollers in contact with said
first mentioned feed rollers.
12. An attachment for sewing machines, com'
prising a frame, a. shaft journalled in the frame
and carrying >a cutting blade, feed rollers fixed to
the shaft and positioned on the respective sides 40
ofthe blade, means' rotating said shaft whereby
said feed rollers are driven, lower feed rollers
located below the blade, a yoke> journalling the
lower feed rollers and being rotatably mounted in
the frame, resilient means yieldingly forcing the
yoke upward to hold the lower feed rollers in
contact with the driven rollers, and a lever
adapted to be manually actuated for holding the
lower rollers ou-t of contact with said driven
rollers.
13. An attachment for sewing machines com
prising, a rotary cutting element, a rotatable shaft
therefor, means operatively connecting said cut
ting elementwith a reciprocating member of the
machine whereby said element is rotated by the
action of the machine, said means including a
ratchet wheel fixed to said shaft, an arm pivoting
on thershaft and carrying a pawl engaging the
ratchet wheeLand an abutment for disconnecting
the pawl for a part of the downward oscillating 60
stroke of the arm.
SARAH M. CREWDSON.
Документ
Категория
Без категории
Просмотров
0
Размер файла
907 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа