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Патент USA US2120229

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June 14, 1938.
G, CALLAHAN
2,120,229
TUFTING ATTACHMENT FOR SEWING MACHINES
‘Filed July 14, 1937
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GEORGE CALL/1 HAN
INVENTOR.
BY
446mm
ATTORNEY.
June 14, 1938.
2,120,229
G, CALLAHAN
TUFTING ATTACHMENT FOR SEWING MACHINES
Filed July 14, 1957
7
2Sheets-Sheet 2
1
6150265 CALLHHAN
I NVENTOR.
BY
v
ATTORNEY.
2,120,229
Patented June 14, 1938
UNITED STATES PATENT‘ OFFICE
2,120,229
TUFTING ATTACHMENT FOR- SEWING
MACHINES
George Callahan, Resaca, Ga., assignor of one~
half to Leo Berman, Dalton, Ga.
Application Julyl4, 1937, Serial No. 153,467
1 Claim. ,(cn. 112-79)
This invention relates generally to sewing ma
chines, but more speci?cally to improvements in
tufting attachments for the production of pile
fabrics such as chenille bedspreads and the like.
5
The main object of the invention is to provide
an attachment of the above class which has a
minimum number and the simplest of parts and
wherein the loops formed in the thread when the
needle penetrates the fabric are received by a
10 hook member radially oscillating with an indirect
drive, the said loops being severed on the hook
member by means of a cutting knife actuated by
the oscillating movement of the hook member.
Another object of the invention is to provide
15 an attachment of the above class which may be
installed in operative relation to the ordinary
cordance with a preferred form- thereof shown in
the drawings, numeral 15 designates the conven
tional head of a sewing machine having the main
drive 16 disposed therein to reciprocate needle
bar 11 carrying the needle I8, the said head also
having a presser foot [9. The main drive or shaft
H5 is connected to a“ pulley 20 driven by any
known external power source. The shaft I6 is
provided with three cams or eccentrics 2|, 22 and
23 mounted thereon, the said cams giving the
feed dog drives and the tufting attachment drive
rotary oscillatory movement.
.
A rotary oscillatory motion is transmitted to
the tufting attachment drive 24 by means of cam
arm 25, the lower end of which arm 25 is pivot 15
ally secured to a link 26, the said link being ?xed
sewing machine without extensively altering the
to drive 24; a rotary oscillatory motion is trans
machine and at a very low cost, all the parts of
the attachment being exposed to view and easily
accessible for purposes of adjustment, replace
mitted to one feed dog drive 21 by means of cam
ignate corresponding parts throughout the several
tively are directly transmitted to give drives 24,
21 and 30 rotary oscillatory motion. The feed 30
‘dog drives 21 and 30 extend longitudinally below
arm 28, the said‘arm 28 being pivoted to one end
of‘a link 29, the other end of the said link 29 20
20
being ?xed to the feed dog drive 21; and a rotary
ment and repair.
.
These objects and other incidental ends and oscillatory motion is transmitted to the other feed
dog drive 30 by means of cam arm’ 3| pivotedat
advantages of the invention will hereinafter ap
pear in the progress of the disclosure and as its lower end to one terminal of link 32, the
other terminal of link 32 being ?xed to the said 25
pointed out in the appended claim.
Accompanying this speci?cation are drawings feed dog drive 30. Thus, the reciprocating move
showing a preferred embodiment of the invention - ment'imparted to the‘ cam arms 25, .28 and 3|
by the cams or eccentrics 2|, 22 and 23 respec
wherein corresponding reference characters des
30
views and wherein:
Figure l is a rear view in elevation of a sew
ing machine showing a portion cut away to ex
pose the main drive of the machine operating
three cams and links, two giving the conventional
35 feed dog drivesThe conventional rotary oscillat
ing motion, while the third link gives a tufting
attachment drive a rotary oscillating motion.
Figure 2 is an enlarged fragmentary side ele
-
vation of a sewing machine embodying the in
40 vented tufting attachment.
Figure 3 is an enlarged fragmentary side ele
vation similar to Figure 2 showing the relative
positions of the threaded needle, the hook mem
the table 33 of the machine and are standard
equipment.
However, the tufting attachment
drive 24 being one of the alteration members of
the sewing machine is journalled between end
depending brackets 34 and 35 secured to the un
derside of table 33.
End brackets 30" and 21'
journal drives 30 and 21.,
,
The needle bar 11 reciprocates within the head
15 in the conventional manner, the said move 40
ment being accomplished by the known bell crank
‘lever secured to the main drive Hi, the said lever
not being shown in the drawings. The needle l8
her and the cutting mechanism of the tufting.at- - reciprocates through the opening 36 of table 33
45 tachment during recession. of the needle from its
downmost position,
.
-
Figure 4 is a view similar to Figure 3 showing
the relative positions of the hook member and
the cutting mechanism when the threaded needle
50 is in a higher position than in Figure 3.
55
over which opening fabric 31 is fed. The presser 45
foot 19 is operated by the usual mechanism with
in the head IS, the said mechanism not being
shown in‘ the drawings.
Feed dog drives 21 and 30 are provided with the ,
conventional feed dog brackets 39 and 39 respec 50
Figure5 is a view similar to Figures 3 and 4
showing the relative positions of the hook mem
ber and the cutting mechanism when the thread
tively, the bracket 39 having secured thereto the
usual toothed and slotted feed dog 40 through
ed needle is in the uppermost position.
end is pivotally secured to extension brackets“
and 42 rigidly secured to feed dog drive 39, while
In accordance with the invention and in ac
which needle 18 reciprocates. Bracket 39 at one
2
2,120,229
feed dog bracket 38 at one end is rigidly secured
to feed dog drive 21. The opposite end of bracket
39 is provided with a U slot 44 which rides on a
roller 45 on the opposite end of bracket 38. Thus,
the feed dog 46 is given an oval motion riding
in and out of opening 36. The feed dog mecha
nism hereinabove described is the known equip
ment used on sewing machines provided with
feed dogs for moving the fabric.
10
'
A bracket 46 is rigidly secured to the tufting
attachment drive 24 to which bracket is adjust
ably secured a block 41 by means of. a screw 48
riding in a vertically disposed longitudinal slot
49 in the lower portion of block 41. The block
15 41 is disposed in a plane perpendicular to the
longitudinal axis of drive 24. Secured to the up
per end of block 41 is a loop receiving ?nger or
hook member 58 having a cutting edge 5I and
a hook 52 at the outer free end. Hook member
56 at the inner end is provided with a transverse
slot 53 through which screw 54 passes into block
41 thereby making the position of hook member
50 adjustable relative to its lateral proximity to
needle I8. It is understood that block 41 may be
25 directly secured to tufting attachment drive 24
without the intervention of bracket 46, and that
attachment to drive 24 may be accomplished by
means of a set screw to give block 41 longitudinal
adjustment along drive 24. It is also understood
30 that block 41 need not be provided with means
for vertical adjustment, the said means having
been described illustratively by means of a screw
48 penetrating slot 49 and entering bracket 46.
A cutting blade 55 is pivotally connected at the
35 upper portion thereof to the ?nger member 50
by any means such as screw 56, the lower end
of the blade 55 being provided with a vertical
slot 51 which rides on a pin 58 secured to a ?xed
support 59 extending from a depending bracket
40 60 of the table 33. Where a longitudinal adjust
ment is made on block 41, it may become neces
sary to make a corresponding adjustment of the
position of pin 58. This may easily be accom
plished by making the ?xed support 59 adjust
45 able along a plane parallel to the longitudinal axis
of drive 24. The ?xed support 53, as shown, is
provided with a slot 59' at one end, the said slot
being disposed perpendicularly to the axis of drive
24. A screw 59" penetrates the slot 53' and en
50 ters the bracket 60. In this way the cutting blade
on hook 52 on the prior ascending stroke, is forced
back along the cutting edge 5I at the second as
cending stroke of needle I8 by a second succeed
ing loop. At the third downward stroke, the ?rst
formed loop, being in the path of cutting blade
55, is severed.
'
The actual severing of the loops takes place
during the downward stroke of needle I8 when
cutting edge 5I passes the‘knife edge of blade 55.
As hereinabove described, there must be two re 10
tained loops on cutting edge 5| so that the inner
one is in the path of blade 55. It is of course un
derstood that by adjusting the relative positions
of blade 55 and cutting edge 5I, the necessity of
an advance loop on cutting edge 5I before sever
ance of the inner loop may be eliminated. Fur
15
thermore; by another adjustment, more than two
loops may be carried on cutting edge 5I before
the innermost one or ones is evenly severed by
a’ single cutting operation.
20
’ It is during the downward stroke of needle I8
that the cutting edge 5| and the cutting edge of
blade 55 meet each other in shearing relation
ship, blade 55 pivoting on upper screw 56 and on
lower pin 58, the vertical displacement of blade 25
55 being provided for by the lower vertical slot
51 therein.
Thus, a tufting attachment has been described
which is applicable to any sewing machine, the
added mechanism consisting of another drive 24
the motions of which are similar to and syn
chronized with the feed dog drives 21 and 30, the
said three drives deriving synchronized oscilla
tory rotary motion from main drive I6. In con
junction with the additional drive 24 are provided 35
a loop receiving ?nger or hook member>50 se
cured to drive 24 and a cutting blade 55 pivoted
to hook member 50 at one end and on the other
end riding on a ?xed pin 58 through a vertical
slot 51 at the lower end of blade 55.
I wish at this point to make it understood that
minor changes and variations in the simpli?ca-v
tion and adjustability of the parts making up
the tufting attachment as well as integration and
connection of the parts per se and as assembled
on the sewing machine may all be resorted to
without departing from the spirit of the invention
and without departing from the scope of the ap
pended claim.
I claim:
'
55 is angularly adjustable relative to the cut
In a sewing machine of the character described 50'
ting edge 5| of hook member 50'. Moreover, the including a main drive for reciprocating a nee—
opposing faces of cutting blade 55 and hook die and for oscillating the feed dog shafts, an
member 50 abut each other so that the cutting additional shaft similarly oscillated by the said
55 edges on the blade 55 and the cutting edge 5I main drive, a transverse extension block secured
of hook member 50 are in shearing relationship to the said additional shaft and radially oscillat
during the operation of the device.
ing with said shaft in a plane perpendicular to
Figures 3, 4 and 5 indicate the several positions the plane in which the needle reciprocates, the
of the tufting attachment parts in relation to said extension block having ?xedly secured there
60 the position of the reciprocating needle I8. The to a projecting looper portion with a hook on
fabric 31, as shown in the said ?gures, is placed one end and a cutting edge inwardly thereof, the 60
under the presser foot I8 above opening 36 in ta
said looper portion being adjustable vertically and
ble 33 for purposes of tufting. The needle, I8 horizontally and oscillating across the path of
carrying thread 6I pierces the fabric 31 and forms movement of the needle to receive loops from the
65 a loop 62 when the-needle I8 attains its ?rst needle, a cutting blade having a vertical slot on
downward stroke. As needle I8 vertically rises ' the lower end and being pivotally connected at 65
from its downmost position, hook 52 proceeds the upper end to said looper portion, and a ?xed
downwardly in its oscillating motion to meet the pivot horizontally adjustable engaging the said
ascending needle I8 at needle eye 63 whereby vertical slot whereby oscillating movements of the
70 hook 52 picks up loop 62 as shown in Figure 3. said extension swing the cutting edges of the
During further ascension of needle I8, hook 52 blade and looper portions to and away from each
retains the loop 62 as best shown in Figures 4 other.
.
and 5. After needle I8 again descends and
GEORGE CALLAHAN.
pierces fabric 31, loop 62, which has been caught
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