Year: 1887

page_text: Date of Application, 14th June, 1887.
Specification Accepted, 15th July, 1887

page_text: secured to the har. The neodle lever is connected to and is adapted to reciprocate the
needle bar in its guides.
F, is the main shaft journaled beneath the bed and, G, is a cam secured thereon and
which imparts the proper movement to the needle lever. H, is a bracket depending
from the bed plate and, I, is a lever whose extremity is pivoted to said bracket.
A cam, J, on the main shaft imparts motion on its pivotal point to the lever, through
the engagement of a shoe or roll upon the latter with the groove in the cam. K, is a
block adapted to slide longitudinally in ways on the lower surface of the bed plate,
and, L, is the looper extending outward from the block and hooked at its end as shown
at figure, 3. A connecting rod, M, extends between and is pivoted both to the
lever, I, and the block, K. The looper and block are both slotted longitudinally for the
reception of a sliding latch, N, whose forward extremity at certain times closes over
the point of the hook for a purpose which will be presently fully explained.
A
O, is a friction clamp secured beneath the bed plate. The rear end of the latch, N,
passes between the jaws of said clamp and is slightly grasped thereby. P. is a finger
secured to a short transverse rock shaft, Q, which is journalled beneath the bed.
shoe in the rock shaft engages with the grooved cam, R, and thereby an oscillatory
movement across the path of the looper, L, is imparted to the extremity of the finger.
01, in figure, 4, is a friction shoe engaging the latch which in this construction is
formed in an are, but which slides to close the hook in the same manner as does the
latch shown at figure, 3.
In figure, 7, I have shown a slightly different looper constructed with a swinging
instead of a sliding latch, and this looper may be used in connection with the other
parts of my machine instead of the preferred construction.
The operation of my invention is as follows:-In stitching with one or more upper
or needle threads and an under or locking thread, as shown at fig. 6, the looper (after
the needles commence to recede upward and thereby throw the loops) is projected
forward through said loops. As the looper moves forward the latch which is held
between the jaws of the friction clamp is not carried by said looper until its backward
limit within the latter (which may be determined by any ordinary stop) is reached.
At this time said latch is entirely within the body of the looper. Then for the latter
part of the forward movement of said looper the latch is carried along thereby, and
slips through the jaws of the clamp.
At the limit of the loopers forward movement the finger, whose eye carries the
lower thread, descends and lays the thread into the hook. The looper then recedes
and the latch slides therein during the first part of its backward movement and until
its end closes over the beard of the hook. It is in this position while the looper slips
backward through the loops of needlethread carrying the lower thread with it.
During the latter part of its backward movement the looper again carries the latch
along and the rear end of said latch slips between the jaws of the clamp. The loops
are then drawn tight in the fabric by any suitable take up. At the commencement
of the next forward movement the hook travels away from the latch as has been
already explained and the loop of under thread slips backward out of the hook.
When the next loop is grasped by the looper it is pulled backward not only through
the loops of needle thread, but also through the loop of under thread which is encircled
about the looper. The opening of the hook during the forward movement permits the
loop held by the hook to slip one onto the body of the looper; the closing of the hook
by the latch during the backward movement prevents said hook from engaging either
the needle loops or its preceeding under thread loops.
In sewing without the use of an under thread and with but a single upper thread,
the looper takes the loop and holds it till the next downward movement of the needle.
It then moves forward to take the second loop, and the first slips backward out of the
hook. Then the second loop is taken and drawn backward through the first, which is
taken up. In this way the common tambour stitch is formed. In sewing with two
or more upper threads without the use of an under thread, the looper seizes the last
loop and draws it through those preceding, whereby doubly or trebly looped stitches
are formed. By slight changes in the timing of the movements of the latch the looper

page_text: can be caused in sewing with-say-four loops of upper thread to take the last two
and draw them through the first two.
The modified looper shown at figure, 4, is operated about its centre instead of
longitudinally as in the preceding figs. Its operation as will be readily seen, is
substantially the same as that of the straight looper.
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 1.
claim is :-
1. The combination with the hooked looper adapted to be reciprocated as described,
of the latch arranged within and adapted alternately to close over the point of the.
hook and to slide backward within the body of the looper, substantially as set forth.
2. The combination in a sewing machine with the reciprocating needle bar and the
needle or needles carried thereby, of the hooked looper, the means for reciprocating
the same, and the latch arranged within the looper and adapted to alternately close
over the hook of said looper, and to recede within the body thereof, substantially as
set forth.
3. The combination with the reciprocating needle bar and the needles carried
thereby, of the longitudinally reciprocating looper, the latch arranged and adapted to
slide within the same, the friction jaws engaging the rear end of said latch and
mechanism as described whereby reciprocatory movements are imparted to both
the looper and needle bar, substantially as specified.
4. A looping mechanism for sewing machines, the same consisting of the hook
pointed looper and means for properly reciprocating the latter beneath the bed plate
and relative to the needle, the latch sliding in the looper to open and close the same,
and a friction device engaging the latch, substantially as described.
5. In a sewing machine, the combination with the needle bar and means for
reciprocating the same of a stitch forming mechanism consisting of the hook pointed
and reciprocating looper arranged beneath the bed plate, the latch arranged and
adapted to slide within said looper, to open and close the hook thereof, the friction
device engaging the rear end of the latch, and the swinging finger receiving motion
from the main shaft and carrying the under thread, substantially as set forth.
6. The combination of the hook pointed and reciprocating looper, the sliding latch
within the same the friction device engaging the rear end of the latch, the swinging
eye pointed finger, mechanism as described for imparting to the latch a longitudinal
reciprocation and further mechanism for imparting to the finger a segmental oscillation
across the path of the looper, substantially as set forth.
7. The combination in a sewing machine, of the reciprocating needle bar and
needles, the needle lever and the cam for operating the latter, the hooked and
longitudinally reciprocating looper, the connecting rod pivoted lover and cam for
operating the latter, the sliding latch arranged and adapted to slide within the looper
aforesaid, the friction clamp engaging the rear end of the latch, and the swinging cam
actuated eye pointed finger arranged to oscillate across the path of the looper and to
carry thread to the same, substantially as specified.