Mechanism for Driving the same.
Year: 1887

page_text: Mechanism for Driving the same.
I, PERCY HADDAN, of the firm of Herbert & Co., Patent. Agents, of 67, Strand,
London, in the County of Middlesex, Civil Engineer, 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 relates to improvements in rotary-shuttles for sewing machines in
which a steady-pin, operating in a chamber of the shuttle-driver-shaft is made, by
means of cam-rings or other suitable device, to advance endwise at the proper time
and enter a socket in the shuttle to support the latter laterally, to the end that the
shuttle is not pressed by the draft of the thread, or by other cause, against the notched
side of the shuttle-race, thereby saving friction and undue wear of parts. Suitable
mechanism is employed to advance the shuttle so as to separate the heel thereof from
the driver at the time that the thread-loop is to pass out between these parts, such
mechanism consisting perferably of an arm extending laterally from the steady-pin
with the outer end of the arm bent toward the shuttle with the extremity thereof
bevelled and made to engage a suitable abuting surface of the shuttle, whereby the
latter is advanced with the thrust of the steady-pin and arm for the purpose aforesaid.
This class of shuttles are cut away on the side where the driver operates, by reason
of which these shuttles seldom or never perfectly balance, and will consequenily
vibrate if run fast. Also, the shuttle race for some distance on top is cut away,
'
D

page_text: leaving much less wearing surface on top to engage the shuttle. The upward
vibration of the shuttle as the heavy side thereof comes uppermost, and the upward
draft of the thread caused by the take-up, occur about the same time, either or both of
which causes the shuttle to press intermittently, but heavily, against the upper side of
the shuttle-race, and the limited surface of the race at this part is consequently soon
worn away. I have devised other means than the shuttle-race, to wit, a steady-pin
for supporting the shuttle during the time that the excessive upward pressure is had.
An attachment of the steady pin is utilized to advance the shuttle, and separate for a
moment the heel thereof from the driver, to allow the thread to pass unobstructed.
In the accompanping drawings Figs. 1 and 2 are, respectively, a front and side
elevation, the latter being in section, of the parts of a sewing machine embodying the
invention. Fig. 3 is an end elevation of the head of the shuttle-driving-shaft, showing
the driver attached, and showing the steady-pin and arm in position. Fig. 4 is a side
elevation in section corresponding in the main with Fig. 2, but showing in section the
cam-rings for reciprocating the steady-pin. Fig. 5 is a plan in section, showing more
especially a recess in the shuttle for receiving the end of the steady-pin-arm. Fig. 6
is a front elevation of the shuttle and driver in position, detached. Fig. 7 is a side
elevation, partly in section, showing more especially the steady-pin engaging the
shuttle, the rearward position of these two parts being shown in Fig. 2. Fig. 8 is a
side elevation of the steady-pin and arm detached. Fig. 9 is an end elevation in
section on the line a Fig. 4. Fig. 10 is a modification hereinafter described.
A represents the shuttle, B the shuttle-race; B¹ the race-cap: C the shuttle-driving-
shaft, and e the driver. The shuttle, between the point a and heel a¹, is cut away to
receive the driver c, as shown in Figs. 1 and 6. The shuttle-race is cut away on top
between the points 6 and 61. The shuttle has a hub A' on which is mounted the
bobbin D and bobbin-case D, all of which, together with the tension device d and
swinging arm d¹ for holding the bobbin-case in place, may be of ordinary construction.
The hub A of the shuttle has a central bore a², and a recess a³, is made at the
periphery of the shuttle, as shown in Fig. 5. The shaft C is journalled in suitable
boxes F, connected with the cloth-plate F¹, only one of these boxes being shown.
The shaft C has an enlarged end or head C³, and has a longitudinal central bore, in
which operates the pin E, the latter having an easy fit so that it may move easily
endwise. The reduced forward end e of the part E is adapted to enter the bore a² of
the shuttle to serve as a steady-pin for the latter. An arm E, is connected with the
pin E, the arm being shaped substantially as shown in Figs. 2, 3, 7 and 8, with the
forwardly-projecting end bevelled at e', and made to enter the recess a³ of the shuttle.
The mechanisms for reciprocating the pin E and arm E, are as follows: The pin E
has a laterally-projecting stud I, that extends out through a slot c', of the shaft, and a
small roller, is journalled on the outer end of the stud. This roller operates
between the two cam-rings J and J¹, by means of which the desired reciprocating
movement is given to the pin E. The cam-rings are perferably set in a sleeve K, the
latter being secured to the forward box F.
The pin e during its engagement with the shuttle, steadies the latter, and supports
and holds it concentric with the race, and the parts are timed so that this support of
the steady-pin comes when it is most needed, when the upward pressure of the shuttle
would otherwise be sustained by the points band b, which would result in these points
being soon worn so as to interfere with the perfect working of the shuttle.
During the time that the thread is passing across the center of the shuttle, the pin e
and arm E are drawn back, the former into the bore of the shaft C, and the latter
into a recess of the head C, so that they are out of the way of the passing thread, as
the forwardly-projecting end of the arm E', enters the recess a³ of the shuttle by
reason of the bevelled or inclined part e, the shuttle is advanced a trifle to separate
the heel of the shuttle from the driver, to allow the thread-loop to pass unobstructed
between these parts. This may be accomplished in other ways, for instance in Fig. 10
the point e is flattened and twisted in a spiral form, and the hole a in the shuttle is
flattened to correspond with a section of the point e, the result being that the spiral

page_text: lead of the pin e, as it enters the shuttle, advances the latter, and with such construction
the arm E may be omitted, but I consider the arm E¹ and recess a³ the better
construction.
Having now particularly described and ascertained the nature of said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1. In a sewing machine, the combination, with a driving-shaft and revolving shuttle
having a recess or opening therein, of a reciprocating steady-pin located within the
driver-shaft and adapted to enter the opening in the shuttle mechanism for recipro-
cating the steady-pin, substantially as set forth.
2. In a sewing machine, the combination, with a driving-shaft having a reciprocating
steady-pin located therein, a revolving shuttle having a recess therein, of an arm
attached to the steady-pin, the end of the arm being adapted to enter the recess of the
shuttle, said arm having a bevelled or inclined surface adapted to advance the shuttle
by engaging the latter, substantially as set forth.
Dated this, 1st day of March 1887.
P. HADDAN. .
By Herbert & Co.,
67, Strand, W.C.,
Agents to Applicant.