Improvements in Dobbies for Looms.
Year: 1897

page_text: Date of Application, 12th Nov., 1897
inn Lott 6th Aur 1000
Annonted 12th Nov
1898
Date of Application, 12th Nov., 1897
1000
Complete Specification Left, 6th Aug.,
Accepted
12th Nov
1898
Improvements in Dobbies for Looms.
We, JOHN EDWARD BARKER, Mechanic, and HENRY BARKER, Cashier, both of
Gathorne Street, Great Horton, Bradford, in the County of York, do hereby declare
the nature of this invention to be as follows:-
The objects of our invention are by a short movement of mechanism to obtain a
double movement of the healds, to keep up the catches when required and so take
the weight off the working parts, and to adjust the opening of the shed from
back to front.
We employ a series of horizontal slides, working in grooves and having each an
extended arm.
Each slide carries the usual catches pivotted thereto, with which
the ordinary knives or grids engage as they are raised or lowered by the peg barrel
or other pattern mechanism. Attached to each slide arm is a pulley, over which
passes a cord fixed at one end, the other end passing from the pulley to a second
guide pulley and thence to the heald cords, the pulleys being so situated in respect
to each other and their slide that on the slide being moved two inches forwards
(by the bars or grids engaging with their hooks) the healds are moved double that
amount.
The catches are specially pivotted in circular openings in the slides, with
recesses in one side through which the pivotting heads of the catches pass when
being placed in working position.
At the top of the body of each slide is catch or recess, and above each set of
catches is a heavy ended lever, which is raised when the healds are required to
remain up, its catch end engaging in the recess in the slide, and so holding it
up until set free by the ordinary pattern mechanism.
For adjusting and varying the opening of the shed, an adjustable rod or bar
is placed across the dobbie to come in contact with the shoulders of the slides,
so that by moving one end of the bar more forwards than the other the shed will
be more open from back to front, that is, graduated.
1007

page_text: .
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:-
The objects of our invention are by a short movement of mechanism to obtain
a double or extended movement of the healds; to keep up the healds when required,
and so take the weight off the working, parts to adjust the opening of the shed
from back to front; also pivotting of the catches and levers; and the slides working
in grooves so as to be clear and independent. of each other. at
DESCRIPTION OF DRAWINGS.
770717 position of the catches,
Fig. 1 is a front view in section of a dobbie showing the p
levers and slide when the heald is at the bottom.
Fig. 2 is a plan of Fig. 1.
Fig. 3 is a front view in-section-of a dobbie showing the position of the catches,
levers and slide when the heald is at the top.
...
Fig. 4 is an end view of catches, heavy ended lever, and grooves, in which work
the slides.
Fig. 5 is a plan of catches connected to slide.
Fig. 6 is a detail of body of slide.
Fig. 7 is a side elevation of a modification of apparatus for obtaining an extended
movement of the healds.
Fig. 8 is a side view of a further modification of Fig. 7.
We employ a series of horizontal slides A, working in grooves B formed upon
cross bars or brackets C, D, these slides have preferably an extended arm E, and
connected to the slides are the usual catches F, G, pivotted or hinged thereto, and
with which the ordinary knives or grids H engage, as the catches are raised or.
lowered at intervals by the lamb levers J, and peg barrel K, or other pattern
mechanism.
}
Attached to each slide arm E, is a pulley E', over which passes a cord, chain or
the like E attached to a fixed pin or rod E3, the other end of the cord or chain
passing from the pulley E¹ to a second pulley E, and thence to the heald cords L,
the pulleys E and E being so situated in respect to each other and their slide,
that on the slide A being moved two inches or more forwards, (by the knives or
grids H engaging with their catches F, G,) the healds L are raised or lowered
double that amount.
Or when preferred the extended arm E may be dispensed with, and the slide A
may be connected by connecting rod A' to a fulcrum. lever A2 hung or pivotted
upon a cross shaft A³, the cord E2 being connected to the bottom of the lever A2
and passing over pulley E, is attached to the healds in the usual way, or see Fig. 8,
we may employ a bell crank lever B¹, this bell crank lever B¹, has one, arm,.
(preferably the one attached to healds L by cord
:
E2) of greater
length than the other, the other arm is connected by connecting rod
A¹ to the slide; by these means it will be seen that whatever move-
ment is given to the slide A, a greater or extended traverse is imparted to the
healds L, the aforesaid connecting rod A¹ being hinged or pivotted to the slide A,
and lever A2, in the same manner as the catches F, G aforesaid.
The catches F, G, are specially pivotted in circular openings F1 in the slides A,
with recesses G¹ on one side, the pivotting heads F2 of the catches pass through
the openings F1 when being placed in a working position, and an extended
flange G³, upon the catch head, prevents the same becoming disengaged, and assists
in keeping the catch in a working position.
Also at the top of the body of each slide is a second extended arm or projec-
tion M, in which is formed a catch or recess N, and above this catch is a heavy
ended lever P, which is lowered when the heald is required to remain up, its catch
end R engaging with the recess N in the slide A, and so holding it up until
released by the ordinary pattern mechanism such pattern mechanism when the
heald is to be released, operating upon a vertical slide S, working within guide
plates S¹, which raises the top catch F clear of its respective knife or grid, simul-

page_text: taneously with which, the top catch bears against a shoulder P¹ on the projection P³
of the heavy ended lever P, and as the slide A is eased off the same, (when the
grids reach the end of their traverse as shown at Fig. 3), it raises the same clear
of the recess N in the slide, so allowing the heald to descend. The projection P3
on the heavy ended lever, is operated upon by the bottom catch G, each alternate
pick, with the same effect.
For adjusting and varying the opening of the shed we employ an adjustable
rod or bar either straight, taper or graduated, this bar X passes across the dobbie,
and comes in contact with the shoulders Y of the slides A, so that by moving one
end of the bar more forwards than the other, the shed will be more open from back
to front, that is graduated.
For preventing the breakage of the pegs K¹ and reducing the wear and tear of
same, (but which forms no part of the invention,) we employ a suitable rocking
shaft T, fixed preferably behind the lamb lever shaft; mounted upon this shaft T
at or near each end are suitable arms U, connected by stretcher or bar U¹, also
upon this shaft is fixed a third arm V, upon which is attached an adjustable pro-
jection or inclined plane V₁, with a flat top, a finger or projection W carrying an
antifriction bowl or runner W1, attached preferably to the bottom knife or grid,
comes in contact with the inclined plane at each forward movement of the grid
or knife, depressing the arm V and raising the arms U and stretcher or bar U₁
which raise and hold the lamb levers J clear of the pegs K¹ in the peg barrel K,
during the time the projection or runner W₁ moves along the flat of the inclined
plane; while the levers J are so raised the peg barrel is moved the requisite distance
by the catch wheel upon its shaft. As the projection W upon the grid releases
the arm V the lamb levers J are lowered on to the pegs K¹ and operate according to
the pattern mechanism.
The finger or projection W carrying the runner W₁, is hinged or pivotted in
such a manner as to allow the same to surmount the projection V₁, upon the
reverse movement of the grid.
Z, Z, Z, Z, are grids or guide brackets for ensuring positive and free action of the
respective levers and catches, so that each series works clear and independent of
the other.
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:-
1. In dobbies for looms the use and employment of slides A, working in grooves.B,
having extended arm E (or connecting rod A¹, and levers A2 and B¹) pulley E¹
and cord or chain E, pivotted catches F, G, lever P slide or bar S, and rod or
bars X operated and operating in the manner and for the purposes substantially
as set forth.
2. in dobbies for looms, pivotting the catches I', G, and connecting rod A' to
the slide A, in the manner substantially as set forth.
3. In dobbies for looms the use and employment of a rod or bar X, for the
purposes substantially as described.
4. The general arrangement and construction of dobbies for looms in the manner
and for the purposes substantially as shown and described.
Dated this Fifth day of August 1808
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax,
Patent Agent for the Applicants.
JOHN E. WALSH,
Waterhouse Chambers, Crossley Street, Halifax,
Patent Agent for the Applicants.