Year: 1888

page_text: Date of Application, 1st June, 1888
Complete Specification Left, 1st Mar., 1889
Complete Specification Accepted, 6th Apr., 1889
I, LUDWIG GUNDELACH, Manufacturer, of 18, Katharinenstrasse, Leipzig, in the
Kingdom of Saxony, do hereby declare the nature of my invention to be as
follows:-
The principal distinctive feature of my improved cloth-feeder or feed motion
consists in the fact of its being operated directly from the shaft which drives the
shuttle.
On the oscillating driving shaft is mounted a cam or toothed disc, and over the latter
is arranged the cloth-feeder in such a manner, that it will be lifted and lowered by the
partial rotation of the horizontal driving shaft. But as a simple up and down
motion of the cloth-feeder would not be sufficient to propel the cloth, a horizontal
to and fro motion is also provided by securing to a downward extension of the cloth-
feeder a movable pin placed so as to come in contact with a tooth of the oscillating
cam mentioned above, and to take part in its forward motion, but to recede and be put
out of action during the return motion of the said cam. For this purpose the said
pin is guided in a socket rectangularly to the plane of the cam and pressed forward by
a helical spring, and the receding motion is produced by an oblique face of the cam
projection or tooth, which face comes in contact with the pin during the return
motion of the cam and presses the pin back into its socket until the tooth has
passed, after which the pin is again pushed forward by the said spring. The
oscillating cam or disc has a second tooth or projection which produces the up and
down motion of the cloth-feeder. The body or main part of the cloth-feeder is a
vertical plate or frame provided at one end with a pair of horizontal pivots guided in
a pair of horizontal slots and connected at the other end with a helical spring
which allows the necessary motion of the feeder. To the top of the vertical plate is

page_text: attached a serrated plate projecting upward through a slot in the table or platform of
the sewing machine as usual and acting on the cloth.
The two contact faces of the vertical cloth-feeder which correspond to the two teeth
of the oscillating disc are formed on separate plates projecting downward from the
main body of the cloth-feeder and rendered adjustable in height.
The devices described impart to the cloth-feeder alternately an up and down and to
and fro motion, and may be adapted to various types of sewing machines.
Dated thig 28th day of Nov 1888

page_text: Improved Feed Mechanism for sewing machines.
I, LUDWIG GUNDELACH, Manufacturer, of 18, Katharinenstrasse, Leipzig, in the
Kingdom of Saxony, do hereby declare the nature of my invention and in what.
manner the same is to bo performed, to be particularly described and ascertained in
and by the following statement :—
The principal distinctive feature of my improved cloth-feeder or feed motion,
illustrated by the accompanying drawings, Figs. 1 to 20, consists in the fact of its
being operated directly from the shaft which drives the shuttle.
as to come in
On the oscillating driving shaft A is mounted a cam, or toothed disc, B and over the
latter is arranged the cloth-feeder D in such a manner, that it will be lifted and
lowered by the partial rotation of the said oscillating or driving shaft A. But as
a simple up and down motion of the cloth-foeder would not be sufficient to propel
the cloth, a horizontal to and fro motion is also provided by securing to a downward
extension of the cloth-feeder, which is adapted to pivot at a and to be placed into
its starting position by a spring b, a movable pin E placed so
contact with a tooth d of the oscillating cam B mentioned above, and to take part
in its forward motion, but to recede and become inactive during the return motion
of the said cam. The said pin E is guided in a socket rectangularly to the plane
of the cam (see Figs. 7 and 8) and pressed forward by a helical spring, and the re-
ceding motion is produced by an oblique face e of the projection or tooth, d, which
face comes in contact with the pin E during the return motion of the
tooth d and, acting as a wedge, presses the pin back into its socket until the tooth
has passed, after which the pin is again pushed forward by the said spring, and pressed
into the recess of the cam, so that, during the next passage of the tooth d the pin will
again recede and the cycle of operations recommence.
The cam B, the piece D and the pin E therefore impart to the cloth-feeder guided
at a and actuated by spring b, a reciprocating up and down motion and a hori-
zontal feed-motion, which has for its effect a sure feed or propulsion of the cloth
to be sewn.
This mechanism is applicable to various systems of sewing machines and may be
modified in the manner illustrated by Figs. 9 to 20.
In the modified form represented by Figs. 9 to 13 the pin E is applied to the cloth-
feeder D vertically, being situated in a socket piece k formed on the piece D, so that the
pin E controlled by the nose d, causes either a feed-motion of D or recedes into *,
while-moving in the same plane as the oscillating piece B.
Or the cloth feeder D may be caused to move in the manner illustrated by Figs. 14
and
to 20, where a hinge-piece h is secured to the bar D, by means of a pivotal bolt
provided with a spring which tends to press it back into the starting position. In
this case the hinge-piece is likewise applied to the bar D vertically, but adapted
to recede laterally during the return motion of B, as in the arrangement shown by
Figs. 1 to 8.

page_text: In both types of mechanism the cloth-feeder D is replaced into its starting
position by the spring 6' after having been propelled by the pin E or hinge-
piece h.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. Mechanism for producing the feed-motion of the cloth in sewing machines,
comprising in its construction a cam B mounted on the shuttle-operating shaft and
provided with recess f and tooth d, a cloth feeder D influenced by a spring, and
carrying a movable pin E, the whole being constructed and arranged in such a manner,
that the cam B produces a horizontal or feed-motion of the cloth-feeder by means
of a pin E, substantially as described and illustrated by Figs. 1 to 8.
2. The modified cloth feeding mechanism, in which the pin E is adapted to move
vertically in the plane of oscillation of B, and the lever D is pressed back by a spring,
substantially as described and illustrated by Figs. 9 to 13.
3. The modified mechanism, comprisng a thumb or hinge-piece / pivoted at g to the
part D and pressed against B by a spring i fixed to the cloth-feeder D, the said hinge
piece being adapted to propel the cloth-feeder during the forward motion of B, and
to slide off an oblique pin e of d during the return of B, in order to recommence the
feed-motion of the cloth-feeder after the latter has been pressed back by spring bl
(Figs: 9-11), substantially-as-described and illustrated-by-Figs. 18-to 20.
Dated this 1st day of March 1880