Improvements in Loom Dobbies.
Year: 1893

page_text: Date of Application, 3rd Mar., 1893
Complete Specification Left, 11th Sept., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Loom Dobbies.
I, SAMUEL JONES, of Glenmount House, Newtownards, in the County of Down,
Ireland, Power Loom Factory Manager, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the mechanism of dobbies for looms and has for its
object the simplification of such mechanism.
Now according to this invention I provide a series of hooks arranged vertically
in a grate which forms both a support and guide for the said hooks.
I provide also one needle for each two hooks the said needles being horizontal
and furnished with projections which are adapted to engage with the hooks.
These needles are actuated by pattern cards which pass over a cylinder to which
is imparted a swinging motion (by means hereinafter to be described) by which
means the needles are forced back until the projections thereon come in contact
with the hooks one end of which is thereby engaged with a series of horizontal
lifting bars to which is imparted a reciprocating motion by means of tappets and
treadles. The treadles are connected by suitable connecting rods to bosses on a
shaft, the bosses are of different diameters so that one end of the lifting bars is
elevated more than the other thus graduating the shed in the woof.
The above mentioned cylinder which is supported by two arms keyed to a second
shaft parallel to the before mentioned shaft receives its swinging motion from a
suitable cam secured to the tappet shaft of the loom which cam actuates a lever
keyed to the second shaft.
Dated this 3rd day of March 1893.
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Loom Dobbies.
1 SAMUEL JONES of Glenmount House Newtownards in the County of Down
Ireland Power Loom Factory Mager do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described in and by the following statement :-
This invention relates to the mechanism of dobbies and has for its object the
simplification of such mechanism.
Now according to this invention I provide a series of hooks arranged vertically
in a grate which forms both a support and guide for the said hooks. I provide also
one needle for each two hooks the said needles being horizontal and furnished with
projections which are adapted to engage with the hooks.
These needles are actuated by pattern cards which pass over a cylinder to which
is imparted a swinging motion (by means hereinafter to be described) by which
means the needles are forced back and the projections thereon come in contact with
the hooks and cause the same to engage with a series of lifting bars to which is
imparted a reciprocating motion by means of tappets and treadles.
The treadles are connected by connecting rods or other suitable means to bosses
ou a shaft the bosses being of different diameters so that one end of the lifting bars
is elevated more than the other thus graduating the shed in the warp.
The above mentioned cylinder which is supported by two arms keyed or otherwise
Price 8d.1

page_text: secured to a second shaft parallel to the before mentioned shaft receives its swinging
motion from a suitable cam secured to the tappet shaft of the loom which cam
actuates a lever keyed to the second shaft or the said lever may be actuated by a
cam or excentric fixed to the crank shaft of the loom.
And in order that my said invention may be fully understood I will proceed to
explain the same with reference to the accompanying drawings in which
Fig. I represents side elevation of a loom dobbie constructed according to this
invention.
Fig. II represents elevation of the other side of the same.
Fig. III is section of same.
Fig. IV is front elevation of same.
The same letters denote the same parts in all the figs.
a is the frame of the machine the cylinder c c needles d d d d hooks arranged
four rows deep in the grate e which serves as a support and guide for the
hooks d d d d. Each needle is bent at cell to form projections which engage with
the hooks done needle engaging with two hooks. The needles c c are actuated by
pattern cards passing over the cylinder 6 to which is imparted a swinging motion
the unperforated portion of the cards as the cylinder swings inwards towards the
needles comes in contact with those which are not opposite the perforations and
forces them inwards the projections cell on these needles carry forward the hooks
with which they are in contact the said hooks being caught and raised by one or
other of the lifting bars 1. 2. 3. 4.
The lifting bars are cast in pairs as shewn at Fig. 3 and raised and lowered by
means of chains or flexible bands passing over and secured to bosses or
pulleys on the shaft which is caused to rotate in either direction through a
portion of a revolution by means of the chain or flexible band k to the ends of
which are attached straps I m these straps are connected by suitable rods chains or
bands to treadles operated by suitable tappets in the usual way.
It will be seen that the boss or pulley is of greater diameter than the pulley i
thereby causing the end of the lifting bars to which the chain or band is attached
to be raised higher than the other the heddles next to the woven cloth being
connected to the hooks which are lifted the least distance thus graduating the shed
through which the shuttle passes.
The cylinder bis supported by the arms n n which are keyed or otherwise secured
to a shaft o to which is secured a slotted lever p.
g is a lever loose on the shaft ja piu or stud r in which engages with the slot in
the lever p.
The lever is caused to reciprocate by means of an excentric or cam secured to
the crank shaft of the loom or by means of a cam secured to the tappet shaft the
motion of the said cam or excentric being conveyed to the long arm of the said lever
by means of a rod.
As the cylinder swings outwards it is caused to rotate one fourth part of a
revolution by means of the catch s which engages with the lugs t' t2 13 14. u is a
double acting catch pivoted to a lever v turning on a stud w which lever is long
enough to be within easy reach of the attendant and the object of this catch and
lever is to enable the attendant to rotate the cylinder in either direction so as to
place any desired card in position for operating the needles this is accomplished in
the following manner supposing the attendant wishes to cause the cylinder to rotate
in the direction of the arrow he moves the lower end of the lever wo to the left
thereby causing the outer projection of the catch u to engage with lug t' and by
continuing to move the lever to the left the cylinder is rotated one fourth part of a
revolution the lever is then moved to the right until the said catch engages with
another lug and so on. If the motion of the cylinder is intended to be in a direction
contrary to the arrow the cylinder is rotated in the opposite direction by the inner
projection ul of the catch u. s is a spring brake to prevent the cylinder from
rotating when actuating the needles.
The bars of the grate e are made extra deep and tapering at the back of the

page_text: hooks d as shewn in Fig. 3 to cause the said hooks to always rest against the
projections cc of the needles c the said needles being kept in their normal position
by means of springs a.
Each hook engages with a slot in a bar y and each pair of bars are connected as
shewn the cords zz being secured to the bow cords of the heddles each heddle being
connected to two pairs of hooks.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
I. In a dobbie the needles c having projections c¹ & c" therein or formed therein
substantially as herein before specified and for the purpose stated.
II. In a dobbie the grate e having deep tapered ribs or bars substantially as
hereinbefore specified and for the purpose stated.
III. In a dobbie the combination of needles having projections thereon engaging
with hooks raised by lifting bars with a cylinder to which is imparted a swinging
motion all substantially as herein before specified and shewn by the accompanying
drawings.
IV. In a dobbie the combination of a series of lifting bars reciprocated by tappets
and treadles with a series of hooks arranged vertically in a grate and caused to
engage with the said lifting bars by means of needles operated by pattern cards
and a rotating cylinder to which is imparted a swinging motion all substantially as
specified.
V. In a dobbie the bosses or pulleys & i of different diameters for the purpose
stated.
VI. In a dobbie constructed as hereinbefore described the catch u pivoted to an
oscillating lever adapted to be operated by the attendant substantially as herein-
before specified and for the purpose stated.
Dated this 11th day of September 1893.
FREDK. WALKER,
Agent for Applicant.