IMPROVEMENTS IN FEEDING MECHANISM FOR SEWING MACHINES
Year: 1885

page_text: I, ALEXANDER ANDERSON, Manager of the Singer Manufacturing Company's
Works, Kilbowie, Dumbartonshire, do hereby declare the nature of my invention
for "IMPROVEMENTS IN FEEDING MECHANISM FOR SEWING MACHINES," (a com-
munication from the Singer Manufacturing Company of New York, in the United
States of America,) and in what manner the same is to be performed, to be
particularly described and ascertained in, and by the following statement:—
My invention relates to a feeding mechanism more particularly intended for that
class of sewing machines having the work-support in the form of an arm or horn,
whereby the machines are adapted for sewing hollow or tubular articles.
My invention comprises a rock-shaft the oscillating of which may be varied, an
oscillating disk carried by said shaft, a feed bar sliding vortically in said disk and
provided with a feed dog, and a second shaft having a cam working in a slotted
opening in said feed bar and thus serving to raise and lower the latter at proper
intervals.
In the drawings figure 1 is a sectional side elevation of a sewing machine
embodying my invention. Figure 2 is a section of the same through the vertical
portion of the bracket arm. Figure 3 is a cross section through the forward end of
the work-supporting arm, showing the feed bar and its carrying disk in elevation.
Figure 4 is a central section through the forward end of the work-supporting arm.
Figure 5 is a side view of the oscillating disk and part of its rock-shaft and figure 6
a face view of said disk. Figure 7 is a detail face view of the feed bar and its feed
dog and figure 8 a side view of the same.
I have herein shown my invention as applied to a sewing machine having a
shuttle-carrying rock-shaft A and a feeding rock-shaft B receiving its movements
from a cam on the upper shaft of the machine the operating mechanism being of
well known construction. The movements of the rock-shaft B are capable of being
varied by a regulator C. I do not however, wish to be understood as limiting my
invention to the particular mechanism above referred to for operating the shafts A
and B, nor is it necessary that the shaft A. should be a rock-shaft as it might have
a continuous rotary instead of an oscillating movement and still properly perform
its functions, as hereinafter described, in operating the feed bar.

page_text: The shaft A is provided at its forward end with a shuttle driver a and just back
of said driver is a feed cam a¹, The rock-shaft B carries at its forward end a
disk b which is herein shown as being formed integral with said shaft. The disk b
is provided with an undercut recess 61, forming guiding ways, and in said recess is
fitted the vertical sliding feed bar D, and to the latter is attached the feed-dog E.
The cam a works in a slotted opening d in the feed bar D, said cam in its rotations
impinging against the horizontal walls only of said opening, thus imparting positive
vertical movements to said bar at proper intervals.
It will be understood that the movements of the two operating shafts are so
timed that the oscillating disk by which the feed bar is moved horizontally, will be.
stationary, or nearly so, during the times when said bar is being moved vertically
by the cam a¹, and thus a feed which is practically a four motioned one and which
is positive in all directions will be produced. As the oscillating movements of the
shaft B, and thus of the disk b carried thereby, may be varied at will it is obvious
that the horizontal or feeding movements of the feed bar and its dog may be
regulated to produce any desired length of stitch.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed declare that what
I claim is
1. In a sewing machine the combination with a rock-shaft having a disk, of a
feed bar adapted to slide vertically in ways in said disk said bar carrying a feed
dog and being provided with an opening, a cam working in said opening, and a
shaft by which said cam is carried, substantially as set forth.
2. In a sewing machine the combination of a rock-shaft having a disk, a
regulator for varying the movements of said rock-shaft, a feed bar movable
vertically in said disk, and having an opening, a feed, dog carried by said bar, a cam
working in said opening, and a shaft by which said cam is carried, substantially as
set forth.
3. The combination with the rock-shaft A having cam a, of the rock-shaft B
having the recessed disk b the feed bar D adapted to slide vertically in said disk
and having the opening d, and the feed dog E, substantially as set forth.
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