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Патент USA US2124033

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July‘v 19, 1938;
2,1
J. F. HAND
SEWING MACHINE MECHANISM.
I Fi1ed_April 1, 1936
3 Sheets-Sheet 1
$4
INVENTOR.
Hand,
2W7
BY
July 19, 1938.
2,124,033
J. F. HAND
SEWING MACHINE MECHANISM
:5 Sheets-Sheet '2
Filed April 1, 1936
-
'
INVENTOR.
rib-Ian 17Hand,
ATTORNEY.
July 19,- 1938.
.» 2,124,033
J. F. HAND ‘
SEWING MACHINE MECHANISM
Filed A?ril 1, 1956’
. s Sheets-Sheet s
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2,124,033
Patented July 19, 1938
UNITED STATES2.124.033PATENT OFFICE
SEWING MACHINE MECHANISM
John F. Hand, Philadelphia, Pa” assignor to The
De Long Hook and Eye Company, a corporation
of Pennsylvania
3 - .
Application April 1, 1936, Serial ‘N... 72,036
(01. 112-—2l
5 Claims.
The invention relates to sewing machine mech
anism and involves various improvements for
automatically adjusting the work feeding device
in order to adapt such mechanism for making
5 stitches of variable length at predetermined in
tervals in the stitching operation.
'
The invention has for one of its principal ob
jects the provision of an elongated stitch at regu
iar intervals in a line of stitches otherwise of
w uniform length. One of the intended purposes
of such elongated stitches is the provision of
‘Fig. 8 is a horizontal sectional view of the ma
chine shown in Fig. 1, takeFiiistbelow .thebase
plate, and showing the work feed device in‘ plan’ >_
view;
~
‘
‘
,
Fig. 4 is a vertical sectional view of the ma- 5
chine taken on the line 4-4 of Fig. 1;
Fig. 5 is a vertical sectional view of the ma
chine taken on the line 5-5 of Fig. 1;
.
Fig. 6 is a vertical sectional view of the ma
10
chine taken on the line 6—5 of Fig. 1;
Fig. ‘7 is an end elevational view of the brake
gaps in a line of stitching used for securing two . mechanism for the cam shaft of the improved
pieces of fabric togethenso that these gaps maty
be utilized to receive the hooked ends of hook
1-5 fastener devices when fastener tape with such
fastener devices thereon is secured to the edge
of the stitched material. This object of them
vention is accomplished by the provision of
.mechanism for periodically increasing the extent
29 of feed of thevwork as, predetermined stitches
are formed.
The invention has for a further object the
provision of improved mechanism for periodically
varying the extent of movement of the intermit
2;5 tent feeding means of a sewing machine. As dis
closed herein, the improvements are incor
porated in a sewing machine of the type in which
a link-bar is utilized for providing intermittent
feeding movement of the feeding device. A par
30 ticular object of the'invention, therefore, is the
provision of improved mechanism for period
ically adjusting the fulcrum of this link-bar to
thereby vary the extent of movement of the
feeding device at each intermittent operation
85 thereof.
A further object of the invention is the pro
vision of means for eil’ecting manual adjustment
of the elongated stitches with respect to the
stitches of normal length in the line of stitching.
49
A still further object of the invention is the
provision of novel means for effecting manual
adjustment of the extent of movement of the
work feeding device to thereby vary the length
' of all the stitches in the line of stitching.
45
Still further objects and advantages of the va
rious features of the invention vwill be apparent
from the following description,.taken with the
accompanying drawings wherein:
'
Fig. 1 is a front elevational view of a sewing
50 machine with the improvements incorporated
therein, parts of the machine being broken away
for clarity;
-
Fig. 2 is a plan view of the machine shown in
Fig. 1, with the overhanging bracket arm broken
55 8-Way;
mechanism, the cam shaft being shown in cross
section;
Fig. 8 is a plan view showing a sectionof two» 15
pieces of material stitched together with the im
proved feed mechanism; and
Fig. 9 is a perspective view illustrating the
manner in which the operative portons of hook
fastener elements may be inserted through the 20
gaps in a line of stitching made with the im
proved mechanism.
-
As illustrated in the drawings, the present im
provements are incorporated in a sewing me
chine having the usual bed plate iii upon one end 25v
of which is mounted the hollow standard it
carrying the overhanging bracket arm i2 upon
the outer end of which the head it is supported.
A needle bar M is mounted for reciprocating
movement in the head l3, and a presser foot bar 30
i5 carrying a presser foot 86 is supported in the
head in’ a manner permitting it to be raised and
lowered by means of the presser foot lever i‘i. ' c
Any well-known means may be employed for
reciprocating the needle bar it from the main 35
drive shaft I8 supported in suitable bearings in
the‘ standard ii and the bracket arm i2. Con
tinuous rotary movement of the drive shaft i8 is
‘provided by means of a pulley i9 secured on the
outer end thereof and to which power may be 40 -
transmitted by a belt from any suitable source.
As disclosed herein, the improvements are uti
lized with an intermittently actuated feeding de
vice comprising a feed dog 20 secured upon a _
feed bar 2!. The teeth of the feed dog 20 pro- 45
ject upwardly through suitable slots in a feed
plate 22 during the operation of advancing the
work w to the stitch ‘forming mechanism com
prising the needle 23 and the loop forming de
50
vice 24.
Horizontal reciprocating movements of‘ the
feed bar 2| are provided by means of a rock shaft
25 supported at its opposite ends upon bearing
screws 26 adjustably threaded in bearing .mem
bers 21 projecting downwardly from the base 55
2
2,124,088
plate III. The rear end of the feed bar 2| is piv
otally connected to spaced rocker arms 23 on the
rock shaft 25 by means of a pair of bearing screws
23 threaded in the arms 23.
'
The vertical movements of the feed bar 2| are
provided, by means of a rock shaft 33 beneath
the front edge of the base plate l0 and having
cooperation with an actuating pawl 32 pivoted
on the outer end of one arm 33 of a bell~crank
lever 34 freely movable on the ‘cam shaft 59. The
free end of the pawl 32 is maintained in engage
ment with the ratchet wheel 3| by a split leaf
spring 35 having one end portion secured to the
arm 33 and. the other end portion in engagement
its opposite ends supported upon bearing screws ' with the pawl 32.
3| adjustably threaded in bearing members 32
10
projecting downwardly from the base plate ill.
The end of the rock shaft 30 adjacent the feed
The arm 33 of the bell-crank lever 34 is pro
vided with a pin 31 to which one end of a" pitman 10
38 is connected. The opposite end of the pitman
bar 2| is provided with a rocker arm 33 having an 33 is connected to a disc 39 on one end of a stub
anti-friction roller 34 mounted on the outer end shaft 10 by means of a crank pin ‘II. The stub
thereof for cooperation with a slot 35 in the for ~ shaft 10 is suitably supported in a bearing block
12 secured on the upper side of the base plate Ill. 15
15 ward end of the feed bar so that rocking move
ments of the rock shaft 30 operate to raise and
The stub shaft 10 is rotated by means of a set
lower the forward end of the feed bar and there
of worm gears 13, 14, the former being secured
by bring the feed dog 20 into and out of work on the stub shaft and the latter being secured to
feeding position in a manner well understood in -a vertical shaft ‘I5. The lower end of vertical
shaft ‘I5 has a bearing support in the bearing 20
_
_
20 the art. '
> Rocking movement of the rock shaft 30 is pro
duced by means of an eccentric rod 33 having its
lower end pivoted to the free end of an arm 31
on the rock shaft 30 and its upper end connected
25 to an eccentric strap 38 which encircles an eccen
tric 33 on the drive shaft l8. Rocking movement
is given to the rock shaft 25 by a link-bar-4ll the
lower end of which is pivoted to the free end of a
rocker arm 4| on the rock shaft 25 and the upper
30 end of which is in the form of a yoke 42 forming
a guideway for a cross-head 43 actuated by an
eccentric 44 on the drive shaft‘ l8.
Thelink-bar 40 is fulcrumed on the upper end
of a link 45 the lower end of which is pivotally
35 secured to the outer end of one arm 43 of a bell
crank adjusting lever 41.
The lever 41 is piv
otally supported on the standard II by means of
a screw 48, as shown in Figs. 1 and 2 of the draw
block 12 and the shaft is supported near its upper
end in a bearing bracket 13 secured to the under
side of the bracket arm I2. The upper end of
shaft 15 extends into the bracket arm l2 through
an opening. 11 and has ?xed thereon a bevel gear
‘I8 which meshes with a corresponding bevel gear
v‘I9 on the drive shaft l8.
As will be apparent from the structure hereto
fore described, the continuous rotary motion of
the drive shaft I8 is transmitted directly to the
vertical shaft 15, thence to the horizontal stub
shaft 10, and intermittent rotary motion is there
upon imparted to the cam shaft 59v through the
pitman 68, the bell-crank lever 34, the pawl 32
and the ratchet wheel 6|. Preferably the num 35
ber of teeth upon-the ratchet wheel 3| corresponds
to the number of stitches made by the stitch.
forming mechanism during each complete rota
ings. In machines of this general character the
tion of cam shaft 59. As illustrated in the draw
bell-crank lever 41 is commonly adjusted into
ings, the mechanism has been designed for a 40
cycle of eight stitches, seven being of normal
different positions by means of a set screw ex
tending outwardly from the lever arm 49 through
a slot 50 in the standard II, the lever 41 being
retained in any desired position by engagement
of the head of the adjusting screw with the edges
of the slot 50. As is well understood, adjustment
of lever 41 operates, through the link 45, to move
the fulcrum of link-bar 4U nearer to or further
from the axis of the shaft l8, and thereby de
50 crease or increase the extent of feeding move
ment of the feed-dog 20.
_
In accordance with the present improvements,
the usual'manual adjusting screw for lever 41 is
replaced by a short rod 5| having its inner end
55 threaded in the arm 49 of the adjusting lever.
The outer end of rod 5| is provided with a head
length as shown by a in Fig. 8, and the eighth
stitch being elongated, as shown by b, for the
purpose of forming a hook receiving gap.
The manner in which the elongated stitch bis 45
formed will be clear, to those skilled in the art,
from the operation of’ the structure heretofore
described. It will be noted, however, that the
projection on the cam 58 is so designed as to pass
by the cam roller 53 during a single actuation of
the pawl 32. During this interval, that is, in
the interval during which the‘ cam roller 53 is
passing over the projection on the cam 58, the
adjusting lever 41 is so actuated as to move the
fulcrum of the link-bar 40 away from the axis 55
of the shaft l8 to thereby increase the throw of
the lower end of the link-bar 40 and consequently
turn-buckle structure 53 forming a part of a cam ' increase the extent of movement of the feed dog
rod by means of which motion is transmitted 20 between two consecutive reciprocations of the
60 periodically to the lever 41 for the purpose of needle bar I4. As a result/the particular stitch 60
e?ecting adjustment of the fulcrum of the link
then being made will be elongated to an extent
bar 40. The lower end of the‘ turn-buckle struc
determined by the design of the cam 53 and the
mm 53 is pivotally connected to the upper end of adjusting lever 41.
a slide bar 54 operating in a guide member 55 the
The illustrated mechanism therefore provides
a simple automatic means which is positively ac
65 lower end of which is secured to the base plate ID.
A ‘cam roller 53 is mounted on the outer end tuated by a moving part of the machine for
of a pin 51 secured on the'slide bar 54 and coop
periodically adjusting the fulcrum of the link-bar
erates with the cam surface of a plate cam 58 and thereby varying the extent of movement of
secured on one end of a cam shaft 59 extending the feed, dog at predetermined intervals without
70 parallel with the drive shaft l8. The cam shaft disrupting the operation of the machine in the 70
' 59 is suitably supported in the upper end of bear
formation of intervening normal stitches. It will
ing brackets 30 secured to the base plate [0 and also be apparent to those skilled in the art that
extending upwardly therefrom.
manual rotation 'of the nut of the turn-buckle
The cam shaft 59 is intermittently rotated by structure 53 provides a simple means for manu
75 means of a ratchet wheel 3| secured thereon for ally adjusting the length of all the-stitches in 75
52 pivotally connected to the upper end of a
3.
9,124,083
the‘ line of‘ stitching. Inasmuch as rotation of
attached to a tape f formed of a folded strip: of . '
the turn-buckle nut inone direction operates to ‘suitable material. The strips of material 0 and
lengthen the cam rod, and rotation of this nut' d_ are folded backwardly over. the line of stitch
- in the opposite direction'operates to shorten the ing. and the operative portions of the hook ele
cam rod, rotation of this nut in one direction or ments e. are inserted through the .gaps. The
the other will effect a permanent setting of the . extreme edge of the strip d is then preferably -
adjusting lever 41 to thereby increase or decrease
the extent of feeding movement of the feed dog
20 as may be desired.
.
I
,
The cam roller 58 is maintained in contact
10
with the surface of the cam 58 by means of a
coiled spring 80 the lower end of which is secured
to a pin 8i,‘ such as the pivot pin between the
slide bar 54 and the turn-buckle structure 53,
15 and the upper’ end of which is secured to the
angularly bent end of a supporting rod 82 having
its lower end secured to the base portion of the
guide member 55..
turned under the tape 1, whereupon the tape is
secured within the folded strips c and d by suit
able lines of stitching g. -It will be understood,
of course, that the wider strip 0 may be the ma
terial of the garment to which the hooks are at
10
tached, although in practice it is preferable to at-_
tach the tape 1‘, with the hooks e'thereon, to the
separate strips_c and Y11 which are thereafter se
15
cured to the edge of the garment.
It willbe understood that Figs. 8 and 9 of the .
drawings merely illustrate one use which may
be made of the form of‘stitching produced by the
The cam shaft 59 is preferably provided with > machine disclosed herein, and it will be apparent 20'
that such stitching is well adapted for other prac
the purpose of controlling the rotation of the tical uses where stitches of normal length would
not provide gaps of the desired length and it
cam shaft, and particularly for preventing re
would be necessary to increase the length of pre
verse rotation thereof. This brake device is pref
erablyin the form of two semi-circular clamp-_ determined stitches at regular intervals through 25
out the line of stitching. _
25 ing members 84 surrounding a collar 85 on shaft
While speci?c forms and arrangements of the
59 and having the lower ends thereof mounted
various
parts of the improved mechanism have
upon a common pivot 86 projecting outwardly
from one of the upstanding brackets 60. The been‘ disclosed, it is to be understood that the
clamping members 84 are preferably provided disclosure is illustrative only and that changes 30
with
a suitable lining 81, and the desired friction in form ‘and arrangement of the elements may
30
may be secured by the adjustment of a wing nut be made without departing from the invention,
88 on a bolt 89 connecting the free ends of the the scope of which is to be determined by the
20 a. brake device .83, as shown in Figs. 1 and '7, for
two clamping members.
I
One end of the cam shaft 59 is also provided
35 with a milled hand wheel 90 for the purpose of
manually rotating the shaft and thereby adjust
ing the elongated stitches b into the position
desired with respect to the work 10. The par
ticular location of the elongated stitches with re
spect to the work having been determined, it is
only necessary to rotate the cam shaft 59 by
means of the hand wheel 90 so as to bring the
operative portion of the cam 58 into such a
position that one of the inclined surfaces there
of is in engagement with the cam roller 56 in
order to de?nitely locate the elongated stitches
on the goods. As illustrated in Fig. 6 of the
drawings, the operative portion of the cam 58 has
just passed by the cam roller 56 and, as a con
sequence, the link-bar 40 is in position for mak
50
ing normal stitches a of uniform length. Should
it'be desired to begin the line of stitching with an
elongated stitch b, the cam shaft 59 may readily
be‘ rotated by means of the hand wheel 90 so as
to bring the advancing edge of the operative
55
portion of the cam 59 into engagement-with the
cam roller 56, whereupon the normal operation of
the sewing machine will ?rst produce an elon
gated stitch b followed by seven short stitches a
so of uniform length, and this cycle will be repeated
throughout the line of stitching.
appended claims.
'
‘
What I desire to claim as my invention is:
1. In a sewing machine of the type having a 35
bed ‘plate, a standard and bracket arm mounted
thereon, a drive shaftmounted in the bracket
arm, and a feed link-bar actuated by an eccen
tric on the drive shaft and fulcrumed upon one
. end of a link pivoted at its opposite end‘to one
arm of a bell-crank feedadjusting lever pivoted
within the standard, the combination of a cam
shaft supported on said bed plate parallel to
said drive shaft, transmission means between
said drive shaft and said cam shaft to rotate 45
said cam shaft intermittently, a cam on said
cam shaft, a cam rod actuated in an endwise
direction by said cam, and a lever extension rig
idly secured at its inner end'to said feed ad
justing lever and projecting outwardly from said 50
standard with its outer end pivoted to said cam
rod to periodically vary the extent of move
ment of the lower end of said link-bar.
2. In 'a sewing machine of the type having a
feed link-bar actuated by the drive shaft and 55
fulcrumed upon one end of a link pivoted at its
opposite end to one arm of a bell-crank feed
adjusting lever, the combination of a cam shaft,
transmission means between said drive shaft and
said cam shaft to rotate‘said cam shaft inter 60
mittently, a cam on said cam shaft, a cam rod
The manner in which two pieces of material actuated in an endwise direction by said cam
such as c and d, sewed together by the machine and including a turnbuckle device to adjust the
disclosed herein, may be utilized with the hook length thereof, and a lever extension rigidly se
‘ cured at one end to said feed adjusting lever and
65 elements e of hook and eye fastener devices is pivoted at its other end to said cam rod to peri
illustrated in Figs. 8 and- 9 of the drawings.
odically vary the extent of movement of the lower
When sewed together with the improved mecha
_ nism, a line of stitching is formed in which
the elongated stitches b occur at regular inter
end of said link-bar.
-
.
3. In a. sewing machine attachment, a cam
shaft, a cam. ?xed on said shaft, a cam rod
70 vals throughout the normal stitches a. The elon- ' mounted for endwise movement by said cam and
gated stitches therefore provide gaps through
having means for connectingthe same to the
which the operative portions of the hook ele
feed adjusting lever of the sewing machine, a
ments e may be inserted in the manner illus
trated in Fig. 9.
75
As shown in Fig. 9, the hook elements e are
ratchet 'wheel ?xed on said cam shaft, a pawl
loosely supported on said cam. shaft for actuat
4
$184,088
ing said‘ratchet wheel,’ a stub shait parallel to
said cam shaft, a crank‘ on said stub shaft, a
pitman operatively connecting said crank and
having a bell-crank lever for adjusting the ful
said pawl, and means for transmitting con
crum of the feed link-bar, a cam shaft, a cam
fixed on saidcam shaft,a cam rod actuated in an
endwise direction by said cam, and having one
tinuous rotary motion from the drive shaft of
end thereof pivotally connected‘ to an arm of
the sewing machine to saidvstub shaft.
said bell-crank lever, a ratchet wheel fixed on
.4. In an attachement for automatically vary- _ said cam shaft for rotating the same step-by
'10
ing the length of the stitch of a sewing machine
having a bell-crank feed regulating lever, a pro-
step, a. pawl loosely mounted on said cam. shaft
for actuating said ratchet wheel, a stub shaft
jecting arm secured to said lever, an intermit- ‘ parallel to said cam shaft, a crank on said stub 10
shaft, a pitman operatively connecting said crank
tently rotated cam, a cam rod actuated in an
endwise direction by said cam and including a and said pawl, means for continuously rotating
tum-buckle structure for adjusting the length of said stub shaft, a brake for resisting reverse ro-v
said rod, and means for pivotally connecting one
15 end of said cam rod to said projecting arm.
tation of said cam shaft, and manually operated
means for rotating said ‘cam shaft.
5. In an attachment for automatically vary
ing the length of the stitch of a sewing machine
JOHN‘ F. HAND.
15
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