Year: 1885

page_text: We, DAVID CRABTREE, and WILLIAM ARTHUR CRABTREE, both of No. 11 Wrose
Brow Road, Windhill, Shipley, in the County of York, Machine Makers, do hereby
déclare the nature of this invention to be as follows:-
The object of our invention is to simplify the mechanism and make the motion
positive for operating the drop boxes of looms, by so arranging the parts that by
moving the actuating tappet one third of a revolution, the drop boxes are changed
to the required position for the next pick.
Our invention is applicable to three shuttle drop box looms, and we accomplish
our object by mounting on what is usually called the low shaft of the loom, an arm
extending on both sides of the shaft and arranged with teeth or projections, which
as the arm revolves, engage in the teeth of a sliding star wheel on the actuating
tappet shaft.
The star wheel is placed between the before mentioned arm and another arm of
a similar construction, mounted on a separate revolving shaft; and when the star
wheel which is connected by rods and levers to what is termed a "telling motion,"
is moved so as to be operated by the teeth or projections on either of the arms, the
tappet on the star wheel shaft operates a lever, and thereby causes the drop boxes
to be moved up or down in accordance with the position of the tappet.

page_text: in Looms.
We, DAVID CRABTREE, and WILLIAM ARTHUR CRABTREE, both of No. 11 Wrose
Brow Road, Windhill, Shipley, in the County of York, Machine Makers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement: —
The object of our invention is to simplify the mechanism and make the motion
positive for operating the drop boxes of looms, by so arranging the parts that by
moving the actuating tappet one third of a revolution, the drop boxes are changed
to the required position for the next pick.
The invention is applicable to three shuttle box looms, and consists in securing
on the low shaft of the loom an arm extending on both sides of the shaft and
fitted with teeth which engage with a sliding star wheel on the tappet shaft placed
between the before mentioned arm and another of the same construction secured
on a shaft in gear with the low-shaft; the star wheel being slided on the shaft
by an ordinary telling motion into such position that one or other of the arms
come in contact and operate the same and tappet, which actuates a lever and the
drop boxes attached thereto, moving the latter up and down in accordance with
the position of the tappet.
In the accompanying drawings, which illustrate our invention, Fig. 1 represents
a side elevation of our apparatus removed from the loom, Fig. 2 a back view with
a portion of the apparatus removed in order that the same may be more clearly
seen and explained, Fig. 3 is a plan, Fig. 4 a detail of the tappet, Fig. 5 a detail of
the slotted bar used for operating the forked arm shewn by Fig. 6. In all the
figures similar letters indicate similar parts.
The apparatus when in working position is bolted to the end of the loom, which
is not shewn by the drawings as it may be applied to any class of three shuttle
drop box loom. In carrying out our invention, we secure on the ordinary low
shaft A of the loom, an arm B which projects on both sides of the shaft and is
fitted with teeth or projections C, which, as the arm 'revolves, engage 'in the spaces
between the teeth of the star wheel D mounted on the tappet shaft E which is
fitted with a feather key in order to allow the star wheel to be slided thereon into
contact with the teeth of the arm B or the teeth on the corresponding arm B¹
geared with and revolving in the opposite direction to the low shaft A.
On the tappet shaft E is secured the tappet F which is in contact with a
pulley G mounted on a stud secured to the lever H, at the opposite end of which
is attached the rod J which is also attached to the shuttle drop boxes, in the
ordinary manner so that when the lever H is operated by the tappet, the shuttle
drop boxes are raised or lowered accordingly.
In connection with the sliding star wheel D, is the forked arm K, the ends of
which pass into the groove D¹ of the star wheel, the other end being secured.
to the stud L. The forked arm K passes through the slot in the bar N which is

page_text: connected by a bar P to a lever of the ordinary telling motion, jacquard or dobby,
and when the said slotted bar N is raised or lowered by the dobby or other
apparatus, the forked arm K radiates on the stud, moving the sliding star wheel D
on the shaft E such a distance that it is operated by the projections C on the
arm B or B¹ thereby moving the tappet F, lever H and the drop boxes attached
thereto; the drop boxes being held stationary during the picking of the shuttle
by the spring S pressing the bar T against one of the flat sides of the angular
stop R secured on the end of the tappet shaft E.
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
The combination of the arms B and B¹ with the star wheel D, tappet F and
lever H substantially in the manner shewn and for the purpose as hereinbefore
described.
The combination of the arms B and B¹ with the star wheel D, forked arm K
and slotted bar N substantially in the manner shewn and described and for the
purpose set forth,