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Патент USA US2112531

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March 29, 1938.
12,112,531
1.. G. BOWMAN
NEEDLE DRIVINGE MECHANISM FOR SEWING MACHINES
Original Filed Sept. 27, 1955
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March 29, 1938.
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1__ G_ BOWMAN
2,112,531
NEEDLE DRIVING MECHANISM FOR SEWING MACHINES
Original Filed Sept. 27, 1955
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Patented Mar. 29, 1938
2,112,531
UNlTED STATES
PATENT OFFICE.
2,112,531
NEEDLE DRIVING LIEGHANI SM FOR SEWING
-
MACHINES
Louis G. Bowman, St. Louis, Mo., assignor to
Lewis Invisible Stitch Machine Company, St.
Louis, Mo., a corporation of Maine
Original application September 27, 1935, Serial
No. 42,547.
Divided and this application April
20, 1936, Serial No. 75,484
1 Claim.
(Cl. 112-—221)
This invention relates to new and useful im
provements in sewing machines generally, but
more particularly to the needle driving mecha
nism thereof.
5
This application constitutes a division of my
co-pending application Serial No. 42,547, ?led
Sept. 27, 1935, for improvements in Sewing ma
chines.
The principal object of this invention is to
10 provide a needle driving mechanism which is ex
tremely simple in construction.
Another object of the invention is to provide
a novel bearing for the needle lever shaft.
With these and other objects in view which will
15 more fully appear, the nature of the invention
will be more clearly understood by following the
description, the appended claim, and the several
views illustrated in the accompanying drawings.
In the drawings:
20
Figure 1 is a front elevation of a sewing ma
chine embodying my invention,
Figure 2 is a partial top plan view thereof,
Figure 3 is a perspective view illustrating the
driving connections for the needle, and
25
Figure 4 is a perspective view of the needle
shaft take-up bearing.
.
Like reference numerals designate correspond
ing parts throughout the several ?gures of the
drawings.
30
The sewing machine to which I have applied my
invention, embodies a main frame including a
base 5, a standard 6, an overhanging or laterally
extending arm 1, and a sewing head 8 which is
secured to the free end of said arm.
35
A main shaft 9 equipped with the usual hand
wheel l0 and drive pulley II is journaled in the
arm and sewing head.
Considering the direction of feed of the fabric
as being away from the operator, the head 8 is
equipped with a forward extension providing a
needle shaft bearing support portion IS, a com
plemental stitch forming mechanism support por
tion I‘! and a drive housing portion “3.
Rigidly secured to the under face of and pro
jecting from the support portion I1 is a hori
zontal presser foot 20 having formed therein a
longitudinal opening effective during the sewing
operation to receive a ridge of material.
The stitch forming mechanism includes a re
ciprocatory needle 24 which is oscillatable angu
larly across the opening in the presser foot. The 5
needle is attached to a needle arm 25, and the
latter is clamped as at 26 to the forward end of
an oscillatory needle shaft 2'! which is journaled
in a bearing sleeve 28 supported in the bearing
support portion 16. It will be observed by ref- 10
erence to Figure 4 that the sleeve 28 has its end
formed in the nature of a split clamp which
facilitates the taking up of undesirable shaft
clearance and thus tends to assure very accurate
needle action. It will be understood that bear- 15
'ings with a thrust motion at one end wear un
evenly, the wear appearing at the thrust end
?rst. By taking up slightly at the split clamp
end of my improved bearing sleeve 28 wear can
be compensated for and the life of the bearing 20
materially prolonged. The bearing sleeve 28 be
ing only partially split, the desired wear take-up
adjustment may be effected without danger of
binding the needle shaft 21. The needle shaft 21
is held against end play by a collar 30.
A crank arm 31 is secured to the needle shaft
and is link-connected as at 32 to one end of a‘
forked bell crank lever 33 which is pivoted as at
34 in the sewing head 8, the fork embracing a
block and eccentric equipment 35 as shown in 30
Figure 3 so that the rotary motion of the main
shaft 9 will be transmitted in the form of oscil
latory motion to the needle.
It is of course to be understood that the details
of structure and arrangement of parts may be 35
variously changed and modi?ed without depart
ing from the spirit and scope of my invention.
I claim:
In a sewing machine, the combination with an
oscillatable needle shaft, a crank secured adja- 40
cent one end of the shaft, driving connections
with the crank for oscillating said shaft, a sleeve
providing rotative bearing for said shaft and
split at the end thereof adjacent the crank, and
means for contracting the split end of the sleeve 45
for hearing adjustment purposes.
LOUIS G. BOWMAN.
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