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June E, i948.
D. FlsçHBElN
Filed Jan. 14, 1946
Íì’atented June l, 1948
ATENT ortica
Dave Fischbein, Minneapolis, Minn.
Application January 14, 1946, Serial No.- 641,091
3 Claims. (Cl. 112-215)
A carrier 24, in the form of a block,` is mounted
on the dowel pins 23 that extend through bores
therein and support said carrier for vertical
My present invention relates to improvements
in sewing machines and, more particularly, to
the work feed dog thereof.
The object of this invention is to provide sim
ple and highly efficient means for operating the
work feed dog.
To the above end, the invention consists of
the novel devices and combination of devices
hereinafter described and deñned in the claims.
In the accompanying drawing, which illustrates
the invention, like characters indicate like parts
throughout the several views.
Referring to the drawing:
Figs. 1 to 4, inclusive, are fragmentary views
of a sewing machine in front elevation, with the
front cover plate removed and showing different
steps in the cycle of operation;
Fig. 5 is a fragmentary plan view of thesewing
machine, with the top cover plate removed and
showing the work feed ydog mechanism positioned
as shown in Fig. 1; and
Fig. 6 is a view partly in plan and partly in
sliding Y, movement thereon. - Extending trans
v`5 versely through the carrier 24, between the dowel
pins 23, is a cam aperture 25'in which is mounted
a cam 26 on the driven shaft I9 for operating the
carrier 24.
As shown, the hook 26 is integral
with the face of the cam 25.
A bracket 21 is rigidly connected to the feed
dog I'I at its rear end portion, depends there- i
from and is secured to the carrier 24 by a screw
It may be presumed that a cycle of operation
as shown in Fig. 1, in which the needle
I2 is in its uppermost position and the feed dog
Il is in its forward and uppermost position. The
feed dog |'|, when in this position, holds the
presser foot I3 raised above the cover plate 9.
20 In this position of the presser foot I3 and the
feed dog |'|, the front end portions of Said feed
dog projects outwardly of the presser foot I3.
When placing a piece of work, not shown, in the
section taken, substantially, onY the line 6_6 of
machine to be sewed, thesame is directed by
The numeral -| indicates a sewing machine cast- 25 the guide finger I4 onto the feed dog |'| and the
initial movement of said feed dog will carry the
ing having therein a compartment 8 provided
with a top cover plate 9 and a front cover plate
work under the presser foot I3.
During the first step in the cycle of operation,
I0, both of which are displaceable.
the cam 26 moves the carrier 24 and hence the
Of the movable parts of the sewing machine
shown, it is important to note the needle bar II 30 connected carriage 2| and the feed dog |'| rear
wardly, as shown in Fig. 2. The cam 26 posi
having a needle I2, the presser foot I3, having
tively holds the carrier 24 so that the feed dog
a forwardly and upwardly inclined guide linger
Il is moved in a straight line parallel to the work
I4, and pivoted at I5 to a spring held bar I6,
held on the cover plate 9 by the presser foot I3.
the feed dog |’| that works in and through slots
I8 in the cover plate 9, only one of which is 35 La the second step in the cycle of operation,
the cam 26 moves the carrier 24 downwardly on
shown in Fig. 1, and the driven shaft I6 that op
the dowel pins 23 and withdraws the feed dog
erates the hook 26 and also the feed dog |'|, as
Il from engagement with the work, as shown in
will hereinafter appear. The sewing machine
parts thus far described are of standard and well
During the third step in the cycle of operation,
known construction.
the carrier 24 is moved forwardly by the cam
Referring now in detail to the invention which
26 with the feed dog |'| in an inoperative posi
relates to novel and highly efficient means for
_ tion in which it is moved parallel to its operative
operating the feed dog |’|. The numeral 2| in
movement, as shown in Fig. 4. At this time, the
dicates a carriage in the form of a flat horizon
tally disposed rectangular block. This carriage 45 carrier 24 moves the carriage 2| on the rails 22.
In the fourth or last step in the cycle of op
2| is mounted on a pair of laterally spaced hori
eration, the cam 26 raises the carrier 24 on the
zontal rails 22. These rails 22 are, as shown,
dowel pins 23 and positions the feed dog |`| in
long nut-equipped bolts, the end portions of
its first position as shown in Fig. 1. This brings
which are mounted in the side walls of the com
partment 8. The rails 22 extend through bores 50 the feed dog |'| again into conta-ct with the work~
for feeding the lsame to the needle I2.
in the carriage 2| and support the same for free
From the above description, it is evident that
endwise sliding movement thereon. A pair of'
the feed dog |`| is moved by a single cam in a
upstanding dowel pins 23 are rigidly secured to
vertical plane in an endless rectangular course.
the carriage 2|. These dowel pins 23 are later
55 This movement of the feed dog I'| is highly im
ally spaced longitudinally of the carriage 2|,
portant for the reason that -the feed dog l1 is
moved perpendicular to the work while being
moved into engagement therewith or withdrawn
therefrom. From the time the feed dog l1 en
3. In a sewing machine, in combination, a, pair
of guide rails, a carriage mounted on the guide
rails for longitudinal reciprocation, a pair of up
standing guides lon the carriage, a carrier mount
gages the work until it is moved out of engage
ment therewith, it is moved in a straight line.
It will be understood that the invention de
scribed is capable of various modifications with
in the scope of the invention herein disclosed and
ed on the guidesl for vertical reciprocation, a feed
dog on the carrier, a transverse cam aperture
in the carrier, a driven cam in the cam aperture
for reciprocating the carrier, and a hook on the
What I- claim is:
1,. In a. sewing machine, in combination, guide> _
rails, a carriage mounted on the guide rails for-_
ì >'I‘he following references are of record in the
horizontal reèipr'ocati’on; dowel pins on the car
"file ofV this patent:
riage perpendicular to the -guide rails, a' carrier
mounted on the dowel _pins for vertical reciproca»-V
tion, a feed dog _on the carrier, and means for
operating the carrier.
2. In a sewing machine, in combination, guid'ef
- NumberA
rails, a carriage mounted on the guide rails for 20
horizontal reciprocation,_ dowel pins o_n the. car
riage perpendicular to, the guide rails, a carrier
mounted‘on thetvdowel pins for vertical-reciproca
tion, a feedV dog on the-carrier, said carrier having
a cam- aperture, and a driven cam‘mounted in 25
said- aperture for operating the carrier.
Oakes,'Jr _________ __ June 28, 1904
Noble ____________ _- Sept. 7, 1920
Wardwell;V ________ __ Apr. 20, 1926
Great. Britain __,____ ______ __ 1921
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