Improvements in Shuttle-checking Apparatus for Looms.
Year: 1890

page_text: Date of Application, 12th Mar., 1890
Complete Specification Left, 11th Dec., 1890-Accepted, 17th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Shuttle-checking Apparatus for Looms.
We, THOMAS CALVERT, Mill Manager, of 25 Brackenbury Street, Preston, and
JOHN HUNT, Pawnbroker, of 8 Derby Street, Preston, in the County of Lancaster,
lo hereby declare the nature of our invention to be as follows:-
This invention relates to the checking of shuttles in looms whilst in motion. Its
objects are to entirely dispense with the leather check-strapping now used for that
purpose, which is both costly, cumbrous, and troublesome, and to reduce the wear
and tear of pickers to a minimum. For this purpose we use two lovers working on
a common centre, stud, or pivot, which is securely fixed on a bracket, bolted to the
lathe, or slay, at the back of the shuttle-box, the lovers are bent so as to form a swell,
which projects through the back board into the shuttle-box, near the ends of it, so
that when the shuttle enters the shuttle-box its course is checked by being securely
held between the full parts of each lever, or swell, and acts in conjunction with a
spring-buffer behind the picker, thereby checking the rebound of the shuttle. The
levers are regulated by a flexible semi-circular flat spring working on a centro, stud,
or pivot, fixed on the samo bracket behind the lovers, which presses against the end
of each lover furthest from the centro, stud, or pivot, thereby giving the levers a
louble action.
THOMAS CALVERT.
JOHN HUNT.
COMPLETE SPECIFICATION.
Improvements in Shuttle-checking Apparatus for Looms.
We, THOMAS CALVERT, Mill Manager, of 25 Brackenbury Street, Preston, in the
County of Lancaster, and JOHN HUNT, Pawnbroker, of 8 Derby Street, in the same
Town, 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 the checking of shuttles in looms whilst in motion. Its
objects are to entirely dispense with the leather check strapping now used for that
purpose, which is expensive, cambrous, and troublesome; and to reduce the wear
and tear of pickers to a minimum. For this purpose we use two levers working on
a common centre stud or pivot, which is securely fixed on a bracket bolted to the
lathe or slay at the back of the shuttle box; the levers are bent so as to form a
swell which projects through the back board into the shuttle box near each end of it,
so that when the shuttle enters the shuttle box its course is checked by being
securely held between the full parts of each bent ever or swell, and acts in conjunction
with a spring buffer behind the picker thereby checking the rebound of the picker.
The levers are regulated by a flexible semi-circular flat spring working on a centre
stud or pivot, fixed on the same bracket behind the levers, which presses against the
end of each lever furthest from the centre stud or pivot thereby giving the levers a
double action.
In the accompanying drawings,
Fig. 1 is a plan view of the shuttle box of a loom having our said invention
annlied to the bout mention therent

page_text: Fig. 2 is a front view of the same shuttle box with the shuttle guide and part of
the picker spindle omitted so that the construction and arrangement of our improved
apparatus may be more clearly seen.
In the said figs. a and bare two curved face levers working on the common stud
or pivot e rising from a plate or bracket d let in to the back of the lathe or slay e and
fastened thereto by means of a screw bolt and nut f. The two curved face levers
project into the shuttle box after the manner of ordinary loom swells and receive
hack pressure at each of their free ends from the two extremities of a bent flat.
spring g having a semi-circular recess which bears against the inner side of a vertical
pivot which (when the levers or swells a and b are prossed back by the shuttle as
hereinafter described) answers as a fulcrum for the spring g. The said spring g is
shewn detached at Fig. 3. i represents leather belting or other suitable material
which in conjunction with a cushioning piece j forms a buffer the said buffer being
supported or carried on the upper ends of standards secured to the back and
front of the lathe or slay. The buffer ij is designed to receive or check the passage
of the picker as the latter is drawn back by the picking stick after having performed
its previous pick or ejectment of the shuttle from the shuttle box. The position of
the shuttle when driven into the shuttle box and held by our improved checking
mechanism is indicated by broken lines at Figs. 1 and 2. The two levers or swells a
and will be pressed back by the shuttle when it is driven into the shuttle box from
their normal position as shewn in Fig. 1 until in line with the back of the shuttle as
will be well understood.
is the shuttle guide the picker spindle and s the picker-all of the usual kind.
Fig. 4 is a plan view of an arm-or-attachment v preferably faced with wood the
latter being curved on its lower side at that end of the shuttle box which the shuttle
enters (see Fig. 2) the wood part forming-an upper guard to prevent the-shuttle
rising as it enters the shuttle box and (applied with our improved checking apparatus)
taking the place of the ordinary device for the same purpose known as the strip,"
The arm is shown in broken lines in Fig. 1 in order that the arrangement of the
parts underneath may be more readily understood. At Fig. 2 that part of the arm
which loops over the central stud c and the hoss of the lever bis shewn in section with
a retaining cross pin overhead.
At
The free end of the lever or swell a is provided with a stop k rising from the plate
or bracket & which determines the amount of its projection into the shuttle box.
Fig. 5 an arrangement is shewn in which the stop & carries a transverse set screw
against the head of which the ear m of the lever or swell a rests. The screw!
provides a means of regulating and adjusting the position or amount of projection
of the lever or swell into the shuttle box. As applied to a loose reed loom the ear m
of the other lever or swell 6 finds its stop against the back of a hinge plate n working
on a vertical stud or pin o rising from the plate or bracket d. To the hinge plate n
is fastened the ordinary hinged Hap p. As applied to a fast reed loom a regulating
device and stop arrangement such as that shewn at Fig. 5 may be conveniently
applied to the ear m of the lever or swell b as well as to that of the lever or
swell a.
The action of theo apparatus hereinabove described and shewn in the drawings is to
arrest the flight of the shuttle as it enters the shuttle box without the aid of a.check
strap or other extraneous assistance—the pressure of the first lever or swell retarding
the progress of the shuttle somewhat gently in the first instance the shuttle thereupon
passing forward and becoming held between the second lever or swell a and the shuttle
guide the said lever or swell a as it is pressed back by the shuttle meanwhile
imparting by its backward pressure on its end of the spring 9 (which now acts also
as a lever) an increased pressure at the other end of the spring 9 and an additional
tightening action on the shuttle on the part of the other or first lever or swell 6 this
combined or double acting function of the spring g on the two levers or swells
supplying the necessary smoothly working and at the same time gradual tightening
or squeezing action required to effectually arrest the progress of the shuttle. Thus

page_text: not only are we enabled to dispense with the employment of a check strap but
the shuttle is prevented from striking the picker as it enters the shuttle box the
wear and tear on the picker being thereby greatly reduced.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
In looms for weaving the application to the shuttle boxes thereof of shuttle checking
or arresting mechanism or apparatus consisting essentially of two curved faced levers
or swells working on a common centrally situated pivot or axis and having back
pressure applied thereto by a spring so mounted as to press upon the free ends of each
of the said levers or swells substantially as hereinabove described and shewn in the
drawings for the purpose or purposes set forth.
Dated this 11th day of December 1890.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.