IMPROVEMENTS IN BUTTON-HOLE. SEWING MACHINES
Year: 1886

page_text: J, GEORGE BROWNING, Farnworth, Widnes, near Liverpool; Mechanician, do
hereby declare the nature of any invention for IMPROVEMENTS IN BUTTON-HOLE.
SEWING MACHINES to be as follows:
"
This Invention which relates to improved mechanism for forming the stitch in
button-hole sewing machines," is designed to be attached to the well-known
Union" button-hole sewing machine in place of the stitch-forming mechanism
ordinarily used. thereon,
In carrying out thease improvements there is provided a horizontal groved cam
placed upon the upright shaft of the machine. This cam drives a bell-crank lever
carried upon a vertical stud the opposite end of which bell-crank lever attached
to a toothed rack which by the revolution of the cain is moved backwards and
forwards. The teeth of the aforesaid rack gear into a toothed pinion on the shaft
of the oscillating looper-carrier which is, thereby driven. The rack is fitted in a
guide to keep it in gear with the pinion. The bearings in which the shaft of the
Jooper-carrier are located are contained in a framework or casting attached by
screws or bolts to the bed of the machine, so that the said framework or casting
together with the looper-carrier and loopers are capable of being adjusted, relatively
with the needle of the machine.
'
The loopers are secured'in groves recessed in the face of the looper-carrier and
the long looper is provided with the usual holes, and grove for carrying the under
thread.
The horizontal groved cam before. mentioned is provided with several cam-like
projections upon its edge, thease cam-like projections give motion to a lever pivoted
to the bed of the machine. A rod connects this lever with the short arm of the
loop-opener lever, which is also pivoted to the bed of the machine. The long arm
of the loop-opener lever carries the loop-opening points which are jointed thereto
and can be adjusted relatively with the needle of the machine.
A spring is provided to return the loop-opener lever to its normal position.

page_text: "
I, GEORGE BROWNING, Farnworth, Widnes near Liverpool Mechanician do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
This invention which relates to improved mechanism for forming the stitch in
button-hole sewing machines is designed to be attached to the well known
"Union" button-hole sewing machine in place of the stitch forming mechanism
ordinarily used thereon.
In carrying out these improvements there is provided a horizontal grooved cam
placed upon the upright shaft of the machine. This cam drives a bell crank lever
carried upon a vertical stud the opposite end of which bell crank lever is attached
to a toothed rack which by the revolution of the cam is moved backwards and
forwards. The teeth of the aforesaid rack gear into a toothed pinion on the shaft
of the oscillating looper-carrier which is thereby driven. The rack is fitted in a
guide to keep it in gear with the pinion. The bearings in which the shaft of the
looper-carrier are located are contained in a framework or casting attached by
screws or bolts to the bed of the machine so that the said framework or casting
together with the looper-carrier and loopers are capable of being adjusted relatively
with the needle of the machine.
The loopers are secured in grooves recessed in the face of the looper-carrier and
the long looper is provided with the usual holes and groove for carrying the under
thread.
The horizontal grooved cam before mentioned is provided with two or more
preferably two projections upon its edge: these cam like projections give motion
to a lever pivotted to the bed of the machine. A rod connects this lever with the
short arm of the loop-opener lever which is also pivotted to the bed of the
machine the long arm of the loop opener lever carries the loop opening points
which are jointed thereto and can be adjusted relative to the needle of the machine.
A spring is provided to return the loop opener lever to its normal position.
:
DESCRIPTION OF THE DRAWINGS.
Fig. 1 is a view of the underside of a button hole sewing machine showing only
my improved mechanism: the rest of the parts which are of usual construction
being omitted Fig. 2 is an end view of the looper-carrier driving gear and Fig. 3
a detail view of the loop opener mechanism. 1 frame or bed of machine, 2 upright
shaft, 3 horizontal.cam with groove 4, 5 bell crank lever pivotted by the stud 6 to
the frame or bed 1. One end of the bell crank lever 5 fits within the groove 4, the
other end is attached to the connecting rod 7 which carries the toothed rack 8.
Opinion gearing with the racks and carried by the shaft 10 in bearings in the
casting or frame 11. On the shaft 10 is the looper-carrier 12. 13 guide to keep
the rack 8 in gear with the pinion 9 The casting or frame 11 is attached to the
frame or bed I by screws 14 to allow of adjustment. 15 loopers secured in grooves

page_text: in the face of the looper-carrier 12. 16 projections on the cam 3 which bear against
the lever 17 pivotted to the frame or bed 1 at 18. 19 rod leading from the
lever 17 to the short arm 20 of the loop-opener lever. The said loop opener lever
is pivotted at 21 to the bed or frame of the machine and the longer arm 22 of the
loop opener lever carries the loop opening points 23, 24. The said points 23, 24 are
pivotted to the arm 22 by screws 25 to permit of their being adjusted nearer to or
further from the needle. The longer one of the loopers 15 is provided with the
usual passage or way 26 for the thread. 27 spring for retaining the loop opener
lever in contact with the rod 19.
The action of the loopers and loop openers in the above mechanism is practically
similar to and makes the same stitch as that ordinarily in use in button hole
sewing machines, but has the following advantages. Owing to the radius of the
pinion 9 being less than the distance of the looper points from their centre of
motion, and the driving arm 20 being shorter than the loop opener carrying arm 22
the said looper points and loop openers move so rapidly in relation to the motion
of the needle when taking up and releasing the loops as to enable any class of
cotton, linen, or silk threads to be used. A further advantage is the adjustability
of the loopers and loop openers to and from the needle by means of the screws 14
and 25.
:
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is,
First. Looper-carrier driving gear for button hole sewing machines substantially
as set forth.
Second. In button hole sewing machines the combination of the rack 8, pinion 9,
shaft 10, bearing 11, and looper carrier 12, with suitable actuating mechanism for
the purpose set forth.
Third. Driving gear for loop openers of button hole sewing machines substantially
as set forth.
Fourth. In button hole sewing machines the combination of the cam pro-
jections 16, lever 17, rod 19, levers 20, 22, and spring 27 for the purpose set forth.
Fifth. Button hole sewing machines with adjustable loop openers substantially
as set forth.
Sixth. The combination in button hole sewing machines of oscillating looper and
spreader mechanism substantially as set forth.
Dated this thirtieth day of October 1886.