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Патент USA US3033154

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May 8, 1962
H'. F. DANIEL
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG OF‘ A SEWING, MACHINE
Filed Jan. 30, 1959
5 Sheets-Sheet 1
May 8, 1962
H'. F. DANIEL
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG OF A SEWING MACHINE
Filed Jan. 30, 1959
Fig.2
5 Sheets-Sheet 2
May 8, 1962
H. F. DANIEL
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG OF A SEWING MACHINE
Filed Jan. 50, 1959
5 Sheets-Sheet 3
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May 8, 1962
H. F. DANIEL
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG OF A SEWING MACHINE
Filed Jan. 50, 1959
5 Sheets-Sheet .4
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May 8, 1962
H. F. DANIEL
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG OF‘ A SEWING MACHINE
Filed Jan. 50, 1959
5 Sheets-Sheet 5
3,033,141
United. states Patent
Patented May 8, 1962
2
1
be shifted upwardly and downwardly within the slot men~
3,033,141
ADJUSTABLE DRIVE FOR FEED DOG ‘OF A
SEWING MACHINE
tioned. Depending upon the position of this element with
in the slot in relation to the dead center thereof, as de
termined by the neutral line mentioned, the feed dog will
Hermann F. Daniel, Stuttgart, Germany, assignor to 5 ‘be given a movement either forwardly or rearwardly at
‘Union ‘Special Maschinenfabrik, G.m.b.I-I., Stuttgart,
Germany
Filed Jan. 30, ‘1959, Ser. No. 790,206
Claims priority, application Germany Feb. 12, 1958
4 Claims. {CL 112-410)
This invention relates to an adjustable drive for the
feed dog of a sewing machine which enables feeding of
the material in opposite directions, i.e. forwardly and rear—
the time the feed dog is lifted into engagement with the
work. In the preferred embodiment of the invention the
feed bar is pivotally mounted at one end upon a second
rocker arranged to rock about the same axis as the feed
10 rocker described. It is, however, free to swing about that
axis independently of the feed rocker and to the extent
and in the direction determined by the particular location
at any instant of the above-mentioned element within the
slot of the feed rocker.
Another feature of the invention is the arrangement by
15
to a predetermined variable extent.
which the slide element cooperating with the arcuate slot
Adjustable drives for the feed dogs of sewing machines
in the feed rocker is shifted to desired positions along said
are well known both in connection with lockstitch and
slot. This arrangement is such that a spring normally
chainstitch sewing machines. The ability to change the
urges the slide element into the position which will bring
direction of feed at will has also been provided in connec
tion with lockstitch machines. Such adjustable drives, 20 about a forward feed action by the feed dog to the extent
determined by the particular setting of the mechanism.
including the reverse feed feature, have heretofore been
wardly, selectively under the control of the operator and
extremely complicated and required a large number of
vparts. The operating connections for reciprocating the
feed dog in constructions of this character have been
Manually adjustable means is provided for determining
. this extent of feed.
Other means operable ‘at the will of
the operator, either by hand, foot or knee action, are pro
taken from the drive shaft of the machine at a point quite 25 vided for shifting the slide against the action of the spring
to bring about a reverse feed action of the feed dog to
remote from the feed dog rather than in the region of
the same predetermined extent. The mechanism provided
the latter. This has led to quite complicated constructions
for accomplishing these results comprises a rock shaft hav
and has also made it very di?icult to control the stitch
length, particularly in machines operating at high speeds.
ing secured thereto, at one end, an arm which is connected
The excessive lengths of the parts and the number of parts 30 with the slide element for shifting the same. A spring nor
mally urges the rock shaft in one direction until it is ar
rested by certain adjustable stop means. This stop means
comprises a disc ?xedly mounted on the frame of the
stitch length.
machine at the front of the base or vertical standard and
A primary object of the present invention has been to
provide an adjustable drive for a feed dog which makes 35 a turnable disc mounted on a rock shaft extending through
the front wall of the frame to ‘a point adjacent the ?rst
possible a feed action in opposite directions and accurate
mentioned rock shaft. The turnable disc is secured to the
control over the extent of feed. Toward these ends the
second rock shaft outwardly of the ?xed disc, with its
new adjustable drive has been made with a minimum of
involved has introduced play and twisting or other dis
tortion tendencies which interfere with accurate control of
inner face adjacent the outer face of the ?xed disc, and
parts and of compact construction, with the operating con
nections from the main drive shaft of the sewing machine 40 carries a longitudinally adjustable screw, the inner end
of ‘which is arranged to cooperate with obliquely disposed
relatively close to the region in which the feed dog oper
ates.
The new construction thus reduces to a minimum
the play and distortion factors which interfere with the
accurate control of the feed movement, particularly in
machines operating at high speeds.
In the construction .of the present invention the feed
bar which carries the feed dog is connected by a link
or pitman with an eccentric on the main drive shaft in
the base of the machine to provide upward and downward
surfaces of a V-shaped recess in the ?xed disc. This ar
rangement is such that the extent to which the turnable
disc and its shaft may be rotated is determined by the
4.5 depth of penetration of the screw into the recess, i.e. by
the location of the inner end of the screw in relation to
the apex of the converging, oblique surfaces of the recess.
The opposite end of the shaft which carries the turnable
disc is connected by suitable linkage with the ?rst-men
movements of the feed dog. The feed bar is also con 50 tioned rock shaft so that the two turn in unison. The ad
justing mechanism may be operated to ‘bring about a re~
nected by a link or connecting ‘rod with a feed rocker
verse feed action of the feed dog either by manual opera
tion of a lever connected with the turnable disc or by
machine to a constant angular extent. In the preferred
connections from a treadle or a knee press member ‘to
construction, both of the links mentioned ‘are connected
with a downwardly and forwardly extending arm of the 55 an intermediate point of the ?rst-mentioned rock shaft.
The extent of rotation of the latter by any of the means
feed bar. Rock movements are imparted to the feed rocker
mentioned is limited by the engagement of the inner end
by a pitman cooperating with an eccentric on the main
of the adjustable screw with the oblique wall of the recess
drive shaft in the region of the feed bar. This rocker is
in the fixed. disc opposite to that which is engaged under
provided with an elongated slot, preferably of arcuate
which is driven by the main drive shaft in the base of the
form, which extends upwardly and downwardly from the 60 the action of the spring. The arrangement is such that
neutral line connecting the axis of the feed rock with the
point of connection of the connecting rod with the feed
bar. The second-mentioned link or connecting rod has
a slide element, preferably having a roller, arranged to
the slide element is shifted below the axis of the feed
rocker to an extent which will provide a reverse feed stroke
of the length determined by the setting of the adjustable
screw.
3,033,141
Still another feature of the adjusting mechanism is
that it includes a ?xed locking pin on the turnable disc
which engages a shoulder on the ?xed disc when the ad
A.
as seen from a point below the latter and looking up
wardly at an angle of 45 ° toward the left.
The illustrative machine embodying the invention has
the conventional frame structure of a modern lockstitch
justing screw mentioned above is withdrawn complete
ly. At this time the ?xed locking pin limits the extent
of rotation of the two rock shafts mentioned, under the
sewing machine and may be of the general character
disclosed in the patent to Reimer, No. 2,643,625, granted
action of the spring, to set the feed bar drive for a maxi
mum stitch length in the forward direction of movement
June 30, 1953. It embodies a base or bed 1 and an
overhanging arm 2 which are connected by the usual
vertical standard. Extending longitudinally of the arm
of the fabric. It will also cooperate with another shoul
der on the stationary disc to limit the turning movement 10 2 is a drive shaft to the right end of which, outside of
the frame, there is secured a pulley 3 and handwheel 4
of the two rock shafts in the opposite direction in re
by which the shaft may be rotated. It will be under
sponse to manual, knee or foot operation. This will de
stood that the pulley 3 is connected in the conventional
termine the maximum feed stroke or stitch length in the
rearward direction of movement of the fabric.
The adjustable drive mechanism for the feed bar pro
vided in accordance with the present invention is of very
simple construction and more reliable in its operation
than devices heretofore provided for the same general
purposes. The driving connections from the main shaft
in the base to the feed bar are all located within a
relatively small space in the region of the feed bar and
relatively few and simple parts are required for the pur
pose.
In accordance with the invention simple means are
provided for indicating to the operator the stitch length
for which the drive mechanism is set. This comprises
a pointer carried by the rotatable disc of the adjusting
mechanism which moves across a scale carried by the
?xed disc mentioned. The normal position of the pointer
manner with a suitable power source.
At its opposite
end the drive shaft in the arm 2 is connected through
the usual crank and link with a needle bar 5 for recip
rocating the latter. In the base or bed of the ma
chine there is provided a main drive shaft 6 which is
operatively connected, through gearing or the like in the
vertical standard, with the drive shaft which carries the
pulley 3. Suitable connections are provided from the
drive shaft 6 for the operation of the work feeding mech
anism and a complementary stitch forming device, such
as a rotary hook, which cooperates with the needle in
the formation of stitches.
The work feeding mechanism comprises a feed bar 7
which is given a four-motion movement by means of
eccentrics 8 and 9 on the shaft 6 (FIGS. 2 and 5). The
feed bar 7 has its rearward end pivotally connected with
indicating the extent of forward feed for which the ma 30 a rocker 10’ (FIG. 4) which is arranged to swing freely
about a stationary shaft 10. Eccentric 8 cooperates
chine is set is determined by the cooperation of the end
with a strap at the upper end of a link or pitman 11, the
of the adjusting screw with the oblique surface of the
lower end of which is pivotally connected to an arm 12
recess in the ?xed disc against which it is urged by the
which extends downwardly and forwardly from the feed
spring. In lieu of this arrangement, a scale may be pro
bar 7. The arrangement is such that the bar has its for
vided on the front face of the vertical standard and ar
ranged to cooperate with a pointer or the like provided
on a lever connected with the rotatable disc and form
ing the manual means for turning the latter.
Both the driving connections from the main shaft
to the feed bar and the connections from the turnable disc
of the adjusting mechanism to the slide element which
cooperates with the arcuate slot to determine the extent
and direction of feed are of completely positive action.
There is no danger of slippage between any of the parts
45
in either of these mechanisms.
Other objects, features and advantages of the inven
tion will appear from the detailed description of a pre
ferred embodiment of the same which will now be given
in conjunction with the accompanying drawings, in which:
FIG. 1 is a front elevational view of a lockstitch sew
ing machine embodying the invention;
ward end lifted and lowered during each revolution of
the shaft 6, as is schematically indicated in FIG. 6. Be
centric 9 receives a strap at the forward end of a link
or pitman 13, the rearward end of which is pivotally con
nected with a feed rocker 14 mounted on the stationary
shaft 10. The feed rocker 14 is thus given a swing
ing movement of ?xed magnitude about the stationary
shaft 10. A forwardly extending portion 15 of the feed
rocker 14 is provided with an arcuate slot which extends
substantially equal distances above and below the axis of
the shaft 10.
In this arcuate slot there is arranged to
slide a roller or block carried at the rearward end of
a link or connecting rod 16. This slide element is shown
at 17 in FIG. 6. At its forward end the link or rod 16
is pivotally connected with the downwardly extending
arm 12 of the feed bar 7.
It will thus be seen that as
the feed rocker 14 is swung by the connections described
FIG. 2 is a bottom view of the machine with a cover
from eccentric 9, the feed bar 7 will be reciprocated lon
plate removed from the bottom of the vertical standard;
gitudinally by means of the link or rod 16. The extent
FIG. 3 is a view partially in end elevation and partial 55 of reciprocation will be determined by the position of
ly in vertical section in the region of the stitch length
the slide element 17 within the arcuate slot of portion
adjusting mechanism;
15 of the feed rocker. No movement will be imparted
FIG. 4 is a transverse vertical section through the base
to the feed bar 7 when the slide element 17 is so posi
tioned as to align the link 16 with the axis of the shaft
60 10. The greater the upward or downward movement
mechanism;
of the slide 17 from this dead center or neutral position,
FIG. 5 is a horizontal sectional view through the por
the greater will be the movement of the feed bar 7.
tion of the base of the machine in the region of the work
Also, it will be noted that when the slide 17 is above
feeding mechanism;
the neutral position mentioned, the link 16 will cause
FIG. 6 is a side view of the feed dog and the feed
bar and shows schematically the various elements 65 the feed bar 7 to beshifted toward the right (FIG. 6)
as the feed rocker 14 is moved in a colckwise direction
through which the feed bar is operated from the main
and the feed bar 7 will be shifted toward the left as the
drive shaft in the base;
feed rocker is swung in a counterclockwise direction.
FIG. 7 is a side view of the feed stroke adjusting
On the other hand, when the slide element 17 is shift
mechanism as seen from the right in FIG. 1 ;
70 ed downwardly below the neutral position, the reverse
FIG. 8 is a face view of the feed stroke adjusting
movements will be imparted to the feed bar 7. Thus,
mechanism as seen from the left in FIG. 7;
the latter will be shifted toward the left upon the clock
FIG. 9 is an outer face view of the ?xed disc of the
wise movement of the feed rocker 14 and will be shifted
toward the right upon the counterclockwise movement
feed stroke adjusting mechanism; and
of the feed rocker. Since the feed rocker 14 is given its
FIG. 10 is a view of the parts shown in FIG. 8
of the machine in the region of the feed bar and related
3,033,141
5
6
swinging movements in a predetermined time relation
to the lifting and lowering movements of the forward
end of the feed bar by the eccentric 8, it will be seen
that the feed dog 18 carried by the feed bar will be
active in one direction of movement when the slide ele~
ment 17 is above its neutral position and in the opposite
direction when the slide element 17 is below the neu
be fed forwardly, i.e. from frontv to rear of the work
and the connected parts when the screw 28 is moved out
wardly to carry its rounded end‘ out of cooperation 'with
the recess 29 a stationary lock pin 33 (FIG. 7) is pro
tral position.
vided on the disc 25 to cooperate with a shoulder on'the
support, while when the slide is below the neutral point
the workv will ‘be fed in the opposite direction.
In order to prevent excessive turning of the disc 25
disc 26. This establishes the maximum feed stroke or
The above-described movements of the various parts
are indicated schematically in FIG. 6. The arrows in 10 stitch length for which the machine may be set. Exces
sive turning of the disc 25, if the lock pin 33 were not
dicate the direction of movement of the various parts and
provided, might produce jamming of the device under
where they point in both directions it is intended to in
the force of the spring 32.
dicate that the part moves in both directions. The dou
A pointer 37 carried by the disc 25 and cooperating
ble-headed arrows on some parts, such as the slide 17
and the link 16, indicate the variable extent of movement 15 with a scale on an extension 36 of disc 26 serves to in
dicate the stitch length or feed stroke for which the ma~
of these in both directions. Just above the feed dog 18
chine has been set by means of the screw 28. The zero
the elliptical formation shows that the effective part of
position on the scale corresponds with the turning of the
the movement of the feed dog, represented by the top
screw 28 until its rounded end 31 engages the bottom
portion of the ellipse, may be in either direction, depend
ing upon whether the slide 17 is above or below its neu
20 or apex of the recess 29.
tral position adjacent the axis of the ?xed shaft 10.
When the slide is above this neutral point the feed dog
will be effective in advancing the work toward the left
(FIG. 6) and when the slide is below the neutral point
the feed dog will advance the work in the direction to
ward the right in FIG. 6.
The slide 17 is connected by means of a link 19 (FIG.
4) to the outer end of a curved or bent lever 21 se
cured to a rock shaft 22. Shaft 22 extends parallel with
As the screw is turned to with
draw its point outwardly from the recess, and the spring
32 turns the disc 25, the pointer 37 will move to succes
sively higher numbers on the scale representing increas
ingly greater stitch lengths.
As shown in FIG. 2, there is secured to the shaft 22
an arm 35 having a split collar which may be clamped
to the shaft in any adjusted position by means of the
screw shown. Arm 35 is adapted for connection, by
means of a chain or rod, with a foot operated treadle or
a knee press member in a manner well known. Upon
the drive shaft 6 and at its end adjacent the vertical stand
ard of the frame is connected by arms 23 and 24 (FIGS.
2 and 3) with a setting device adapted to adjust the feed
stroke and hence the stitch length to be provided. This
setting device comprises two discs 25 and 26. Disc 26
is ?xedly secured to the outer face of the front wall of
the frame while disc 25 is turnable in relation to disc 26
and carries an operating lever 27 (FIGS. 1 and 3) which
may be used to manually turn the disc. A screw 28 has
'ner as when the operating lever 27 is moved.
screw threaded engagement with the disc 25 and has a
of the recess 29. Thus the extent of turning of the shaft
22 will be determined by the adjustment of the screw 28.
rounded inner end 31 arranged to cooperate with the
oblique walls of a V-shaped recess 29 in the disc 26.
By turning the screw 28 its rounded, inner end may be
operation of the treadle or knee press the shaft 22 will
be rocked to shift the slide element 17 along the arcuate
slot against the action of the spring 32 in the same man
When
the shaft 22 is thus turned, it will serve to turn the shaft
34 through the connections 23, 24 and will thus cause
the disc 25 to turn until the point 31 of screw 28 is
brought into engagement with the opposite oblique wall
adjusted to a greater or lesser depth within the recess
29. The further the rounded end extends into the recess
While an illustrative embodiment of the invention has
been described in considerable detail, it will be under
stood that various changes may be made in the construc
tion and arrangement of parts within the scope of the
the shorter will be the stitch length provided. A knurled
appended claims.
locknut carried by the screw 28 serves to retain it in any
adjusted position. Disc 25 is secured to the outer end
of a shaft 34 extending through the front wall of the
frame of the machine and downwardly at a suitable angle.
At its inner end the shaft 34 has secured thereto the
arm 23 which is connected by a link with the arm 24
'
What is claimed is:
1. In a sewing machine having a base and an arm ex
tending over said base, a reversible work feeding mecha
nism in said base comprising a horizontally disposed feed
bar arranged for pivotal movement about a horizontal
axis and for longitudinal reciprocatory movement along
the line of feed, a rotary drive shaft in said base, a rock
member in said base arranged for rocking movement
secured to the rock shaft 22. A torsion spring 32 (FIG.
2) mounted on the shaft 22 has one end engaged with
a collar secured to the shaft and its other end engaged
about a second horizontal axis, said two horizontal axes
with a portion of the frame. It is arranged to urge the 55 being parallel with the axis of said shaft and on the
shaft 22 in a clockwise direction (FIG. 4) and through
same side thereof, connections from said shaft for im
the arms 23 and 24 turns the shaft 34 and disc 25 until
parting rocking movements of ?xed predetermined ex
the rounded end 31 of screw 28 engages one of the walls
tent to said rock member, said member having an arcuate
of the recess 29, as shown in FIGS. 3 and 7. By virtue
of this arrangement the position of the slide 17 in the 60 slot extending above and below said second horizontal
axis, a slide shiftable along said arcuate slot, a link hav
upper portion of the arcuate slot of part 15, under the
ing one end pivotally connected directly with said feed
influence of spring 32, will be determined by the position
bar at a point thereon a substantial distance away from
to which the inner end of the screw 28 has been adjusted.
said ?rst-mentioned horizontal axis and its other end
Also the extent to which the slide 17 may be moved down
wardly below the dead center or neutral point by rota 65 pivotally connected with said slide, and means operable
at the will of the operator for shifting said slide along
tion of the shaft 22 through the turning of disc 25 by
said slot between positions above and below said second
lever 27, for example, will be limited by the engagement
horizontal axis.
of the rounded end 31 of screw 28 with the opposite
2. In a sewing machine of the character set forth in
sloping wall or surface of the recess 29. As previously 70
claim 1, a second rocker pivotally mounted for free
explained, the extent of longitudinal movement of the
feed bar 7 and feed dog 18 will be determined by the
position of the slide 17 in the arcuate slot and will thus
be controlled by the adjustment of the screw 28. When
‘the slide is in the upper portion of the slot the work will 75
rocking movement about said second horizontal axis, said
feed bar being pivotally connected with said second
rocker at a point removed from said second horizontal
axis.
3,033,141
8
a
3. In a sewing machine of the character set forth in
claim 1, spring means for normally urging said slide to
ward one end of said arcuate slot, said means operable
at the will of the operator serving to move said slide
against the action of said spring to a predetermined posi
tion along said slot.
4. In a sewing machine of the character set forth in
claim 1, said feed bar having an arm extending down
wardly and forwardly beneath said drive shaft, an eccen
tric on said shaft and connections therefrom to said arm
of the feed bar for imparting lifting and lowering move
References Cited in the file of this patent
UNITED STATES PATENTS
1,100,497
1,243,160
1,565,665
2,034,593
2,409,242
2,711,145
2,811,123
2,318,039
ments to the forward end of the feed bar, said link hav
ing its one end connected with said arm of said feed bar
for imparting longitudinal movements to the latter.
Seymour ____________ __
Grieb ______________ __
Merrow ____________ __
Nissen _____________ __
Becker _____________ __
Pagni ______________ __
Hayes ______________ .._
June
Oct.
Dec.
Mar.
Oct.
June
Oct.
16,
16,
15,
17,
15,
21,
29,
Ayres ______________ __ Dec. 31,
1914
1917
1925
1936
1946
1955
1957
1957
FOREIGN PATENTS
712,147
Great Britain ________ __ July 21,
1954
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