Improvements in or Applicable to Single or Double-lift Dobbies for Looms.
Year: 1886

page_text: Date of Application, 6th May, 1886.
Complete Left, 5th Feb., 1887.
Complete Accepted, 8th Mar., 1887
PROVISIONAL SPECIFICATION.
Improvements in or Applicable to Single or Double-lift Dobbies
for Looms.
We, BERRY BRIDGE of Leeman's Hill, near Bury in the County of Lancaster,
Hatter, and JOHN ARMITAGE CALVERT, of 27 Bury New Road, Heywood, in the same
County, Mill Manager, do hereby declare the nature of our invention to be as
follows:-
The object of this invention is improvements in Top Dobbies for Looms, in order to
render the same capable of turning back to find the pick in case of a breakage of the
weft.
An
Instead of operating the card cylinder by means of a ratchet wheel and pusher
catch or pawl as heretofore we employ a peg pinion keyed upon the crank shaft.
endless peg chain passes round this pinion on to a larger peg wheel at one extremity
of a revolving shaft. This shaft at its other extremity is geared by evil wheels to a
specially formed star wheel which, in turn, so gears with a star wheel upon the card
cylinder shaft as to strike and then to give a pause at every movement.
In this manner we are enabled to produce a motion for operating the card cylinder
which is capable of turning back, in case of a breakage of the weft, to find the pick
with certainty as aforesaid.
JOHN G. WILSON,
Agent for the Applicants.

page_text: Improvements in or Applicable to Single or Double-lift Dobbies
for Looms.
We BERRY BRIDGE of Leeman's Hill, near Bury, in the County of Lancaster,
Hatter, and JOHN ARMITAGE CALVERT, of 27 Bury New Road, Heywood, in the same
County, Mill Manager, do hereby declare the nature of our invention and in what
manner the same is to be perforined, to be particularly described and ascertained in
and by the following statement :-
The object of this invention is improvements in Top Dobbies for Looms in order to
render the same capable of turning back to find the pick in case of a breakage of the
weft.
On the accompanying drawing Fig. 1. is a back elevation, Fig. 2. a plan view and
Fig. 3. an end view of our improved machanism applicable to double-lift Dobbies.
In performing our invention, instead of operating the card cylinder by means of a
ratchet wheel and pusher catch or pawl as heretofore we employ a peg pinion a. keyed
upon the crank shaft b. An endless peg chain c. passes round this pinion on to a
larger peg wheel d. at one extremity of a revolving shaft e. This shaft e. revolves in
the bearing or bracket e¹ and at its other extremity is geared by bevil wheels f. to
a specially-formed or double-toothed star wheel g. which in turn so gears with a star
wheel. upon the card cylinder shaft i. as to strike and then to give a pause to the
card cylinder at every movement.
A full-size front view of this double toothed star wheel g. is illustrated in Fig. 4.
In this manner we are enabled to produce a motion for operating the card cylinder
of a Dobby which is capable of turning back in case of a breakage of the weft to find
the pick with certainty as aforesaid.
In applying our improvements to single-lift Dobbies, the only alteration is in the
star wheel g. which, in this case, has two extra teeth (as indicated by the dotted lines
in Fig. 4.) so as to strike twice as fast.
Having thus particularly described and ascertained the nature of our invention and
in what manner the same is to be performed, we declare that what we claim is :-
The improvements in or applicable to single or double-lift Dobbies for Looms
substantially as and for the purposes herein before described.
JOHN G. WILSON,
Agent for the Applicants.