IMPROVEMENTS IN MECHANISM FOR OPERATING THE SHUTTLE BOXES OF LOOMS
Year: 1885

page_text: We, PETER YOUNG, Manufacturer, and JOHN MATHIESON, Mechanic, both of
9 Scotland Street, Glasgow, in the county of Renfrew, do hereby declare the
nature of our said Invention for "IMPROVEMENTS IN MECHANISM FOR OPERATING
THE SHUTTLE BOXES OF LOOMS" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
This Invention is a further development of or improvement on the shuttle box
changing mechanism for looms described in the Specification of Letters Patent
No 4562 dated 6th November 1880, and it consists mainly in substituting for the
drawhooks employed in that arrangement for operating the tappet wheel actuating
the cranks or eccentrics which give motion to the shuttle box spear lever or levers,
an oscillating double hook connected to the pattern mechanism and operating to
impart an oscillatory instead of a rotatory motion to the tappet wheel, the object
of the present improvements being to ensure the raising of the shuttle boxes in
proper order in restarting the loom after a stoppage and undoing of the weft.
Our invention is illustrated in the accompanying drawings in which Figure 1 is
a side elevation and Figure 2 a plan of part of a loom fitted with our improved
shuttle box operating mechanism.
In the improved arrangement of shuttle box operating mechanism the differential
lever or levers A A¹ which communicate motion to the shuttle box spear B from
the cranks or eccentrics C C operated by the tappet wheels D D, remain as in that
described in the Specification above referred to, but each tappet wheel D is
provided with only two tappets or pins & which are fitted on opposite sides of the
oscillating centre D¹. The double drawhook E is made in the form of an inverted
V, the limbs terminating in hooks e which engage the pins or tappets & and the
apex or point of the V like double hook being centered at E' so that it may freely
oscillate on a lever F actuated by a cam or wiper G on one of the loom shafts
G¹. One or other of the hook limbs e is brought under the tappet or pin d on the
corresponding side of the oscillating centre D₁ by means of a rod H and lever I
actuated by the pattern mechanism (which may be a jacquard or pattern barrel J)
according to the pattern which it is intended to weave, and the cam or wiper G in
coming round raises the lever F carrying the double hook E, and the hook e
engaging the tappet d draws round the tappet wheel D, so that the crank or

page_text: eccentric C in gear with it is turned to the extent of its throw, and by acting
through the differential lever A or levers A A¹, and spear B raises or lowers the
shuttle boxes B¹. Two or more tappet wheels D and double hooks E may be
provided and may be geared to cranks or eccentrics C on either or on both sides,
connected to levers as in the arrangement illustrated in the drawings accompanying
the Specification already alluded to, according to the number of shuttle boxes on
the loom.
In order to prevent the oscillation of the double hook E on its centre at each
action of the pattern mechanism J on the needle levers I which communicate
motion to the double hook E, we provide an additional needle lever I working
over the pattern barrel or the cards of the jacquard, and arrange it to act on a
tilting bar K which supports the usual needle levers I. When either of the needle
levers is raised in accordance with the pattern, it rests on the tilting bar K. and it
is there retained until the auxiliary lever I tilts the bar when it either continues
to remain up or falls, according as the hole in the barrel or in the card J is or
is not covered. The needle bar I which remains up effects no change on the
corresponding double hook E and the tappet wheel D on which it operates is not
oscillated, but the bar I which falls acts on its corresponding hook E and that
hook effects a change in position of its tappet wheel D, and of the shuttle boxes.
The arrangement of the double hook operated by the jacquard or pattern barrel
in combination with tappet wheels, operating cranks, and eccentrics may be used
to actuate the shuttle boxes either direct or through arrangements of levers other
than the differential levers illustrated.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is
First. The combination, in shuttle box operating mechanism for looms, of the
double books E operated by the jacquard or pattern mechanism with the tappet
wheels and cranks or eccentrics actuating the shuttle box spear substantially as
herein described and illustrated.
Second. The arrangement of tilting bar K in combination with the auxiliary
needle lever I adapted to hold up the ordinary needle levers, and prevent oscillation
of the double hook E, substantially as herein described and illustrated.
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