Improvements in Looms for Weaving.
Year: 1893

page_text: Date of Application, 22nd Feb., 1893
Complete Specification Left, 21st Dec., 1893-Accepted, 22nd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Looms for Weaving.
We GEORGE HERBERT HODGSON Machine Maker of Laycock Mill Bradford,
in the County of York and FRANK LEEMING of said place, Manager, do hereby
declare the nature of this invention to be as follows:-
This invention consists of improvements relating
Firstly. To improvements in positive dobbies.
Secondly. Improved apparatus for operating sliding picking tappets.
Thirdly. Improved appliances for ensuring reversal of the motion of multiple
shuttle boxes.
In a positive dobby it is necessary a clearance space should be provided between
the ends of the "catches" and the "propping bar," in order that the catches may
as required be dropped into line with said bar, such space admits of slight move-
ment or backlash of the said catches such movement when multiplied by the jack
levers and connections with the healds permits an appreciable and objectionable
partial closing or narrowing of the shed. To obviate the defect we employ a loose
sliding propping bar and couple it to or with the draw knife and by slotted lever
or other like connection the propping bar soon as the ends of the catches are in
line therewith is moved to and against the ends of the catches so preventing
any movement or backlash of the catches, when the shed is opened or formed.
The moving in and out of the sliding picking tappets is effected from the pattern
mechanism through the agency of connecting rod and link which by means of a
fork slide, when required and as indicated, gears a toothed wheel into a second
toothed wheel in which is a stud to which is attached one end of a crank rod, other
end of latter being attached to one end of a cranked lever rocking on a fulcrum
stud, the other end of said cranked lever terminates in a fork received in a groove
formed in the boss, of the sliding tappet and which is thus moved in and out of reach of
the picking cone, according to the pattern required; connecting rods and bell crank
levers connect the cranked rocking lever with a lever for operating the picking
tappet at the opposite end of the loom.
For producing reversal of movement of the shuttle boxes a clutch being by
connections convenient to the weaver or attendant on the loom said clutch can be
manipulated so as to drive one or other of two wheels and as the latter operate
the box tappet or pattern chains the movement of the boxes in either direction is
readily effected.
•
Dated this 20th day of February 1893.
WALTER BRIERLEY,
Penny Bank Chambers, Halifax, Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Looms for Weaving.
We, GEORGE HERBERT HODGSON, Machine Maker, and FRANK LEEMING,
0 Manager, both of Laycock Mills, Bradford, in the County of York, 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

page_text: In a positive dobby it is necessary a clearance space should be provided between
the ends of the "catches" and the "propping bar," in order that the catches may,
as required, drop into line with said bar, such space admits of a slight movement or
backlash of the said catches, which movement when multiplied by the jack levers and
connections with the healds, permits an appreciable and objectionable partial closing
or narrowing of the shed." To obviate the defect, we employ a loose sliding
propping bar, and couple it to or with the draw knife, and by slotted lever or other
like connections, the propping bar as soon as the ends of the catches are in line
therewith, is moved to and against the ends of the catches, so preventing any
movement or backlash of the catches.
Secondly. Improved apparatus for operating the sliding picking tappets.
Thirdly. To improved appliances for ensuring reversal of the motion for
controlling the action of multiple shuttle boxes.
Such being the nature and object of our said invention, the following is a
complete description of same, reference being had to the acccompanying drawings,
in which :-
Fig. 1 is a side elevation of the improved apparatus for preventing backlash of
the draw catches or hooks, shewing the clearance space between the propping bar
and catches required for selection or indication of the latter, and shewing the
upper draw bar and catches of a dobby.
Fig. 2 is a similar view to Fig. 1 but shewing the propping bar in contact
with the ends of the lower catches of a dobby, these two figs. representing part of
one side of a dobby.
Fig. 3 is a front elevation of part of a loom, shewing the improved apparatus for
operating the sliding picking tappets, and the apparatus for ensuring reversal of the
multiple shuttle boxes.
Fig. 3 is an end elevation of part of Fig. 3.
Fig. 4 is a plan view of the improved apparatus for ensuring the reversal of the
multiple shuttle boxes.
Fig. 5 is a plan view of the improved apparatus for operating the sliding picking
tappets.
Fig. 6 is a front elevation of part of a loom shewing a modification of the
improved apparatus for "treading out" the sliding picking tappets.
Fig. 6A is a plan view of part of Fig. 6.
According to this invention, in order to prevent "backlash" of the draw catches
or hooks 1. in a positive dobby, we employ loose sliding propping bars 2. 2ª, for
and in connection with both the upper and lower draw catches or hooks 1. 1, said
bars 2. 2 being carried in a slot or slide 3 in the dobby frame 4. A stud or pin 5
at each end of the propping bars 2. 2ª is received in a slot 6 in a cranked slotted
lever 7, the lower end of which is free to move on its fulcrum stud 8 fixed to the
dobby frame 4. The upper arm of the cranked lever 7 has a curved slot 9 in it;
and in this slot 9 the stud 10 at the end of the draw knife or bar 11 is received.
The action is as follows:- When the draw bar, 11 is back, and the draw hooks or
catches 1 are down and in line with the propping bar 2 (see Fig. 2.), the space 12
between the said propping bar 2* and the ends of the catches or hooks 1 allows
the freedom required for selection or "indication" of the catches 1 by the ordinary
tumbler levers B.
When the knife or bar 11 is moved in the ordinary manner in its slot 13 to the
position shewn by Fig. 2, i.e. forward, the stud 10 moving along and acting on the
curved slot 9, the end 14 of the lever 7 is slightly depressed as shewn, consequently
the said lever moves slightly on its fulcrum stud 8 and also carries the propping
bar 2 with it, so that the latter is brought against the ends of the catches or hooks 1,
and any movement or backlash of the same is prevented when the shed is opened or
formed. A like apparatus is preferably fixed at each side of the dobby, i.e. to
each end of the propping bars 2. 2" and draw knives 11. 11.
The moving in and out of the sliding picking tappets 1. 1 (see Figs. 3, 5 and 6)
is effected from the ordinary pattern mechanism 2 through the agency of connecting

page_text: rod 3 and link 4, which by means of a fork 3, slides when required and as indicated,
a star wheel 6 into line with a second star wheel 7, in which is a stud 8, to latter
is attached one end of an adjustable connecting rod 9, the other end of same being
attached to one end of a cranked lever 10 rocking on a fulcrum stud 11, the other
end of said cranked lever 10 terminates in a fork 11* received in a groove 12
formed in the boss of the sliding tappet 1, and which is thus moved in and out of line
or contact with the picking cone 14 on the picking shaft 14° as indicated by the
pattern mechanism according to the pattern required.
A connecting rod 15 connects the cranked rocking lever 10 with a lever 10" for
operating the picking tappet 1 at the opposite end of the loom.
"
1
In order that the picking tappets 1. 1 can both be "tread or slided out of
operation by the attendant or weaver, we connect to the levers 10. 10, the links 16
which at their other ends are connected to the bell crank levers 17. 17, carried on
the studs 18, 18, fixed in the bottom back rail of the loom. The ends of the bell
crank levers 17. 17 are connected to the lever 19, carried on the fulcrum stud 20,
and its free end connected by link 21 to the treadle lever 22. When the treadle 22
is depressed, the link 21 forces up the end of the lever 19, and its opposite end is
lowered, and the bell crank levers 17. 17 are turned on their centres 18. 18, and
the ends of the rods 16 are thereby drawn towards each other, and both the
tappets 1. 1 are slided out of line with the cones 14.
The lever 10 is a broken backed lever, the two parts being held together by
spring 25, so that when the tappets 1.1 are moved by the treadle 22, the indicating
or pattern mechanism is not affected.
A spring 26 on the rod, 15 allows of the necessary escapement of lever 10* at
the opposite end of the loom, the end of the rod 15 passing through a slot or hole
in the lever 10*, and a collar 10 is then fixed on the end of rod 15. The spring
is maintained in position by the collar 10° on the rod 15.
In the ends of the links 16 are slots 26 which allow the levers 10. 10* to be
operated by the pattern mechanism without affecting the treadle and its connections
when the treadle 22 is in its normal position.
The levers 10. 10" for operating the sliding tappets 1. 1 (see Fig. 6.) may be
connected by levers 27. 27 centred at 28, and between such levers 27. 27 is a
double tappet 29, which is operated by treadle 22, on the end of the rod 20 (see
Fig. 6A) which extends to the front of the loom, and by giving a partial turn to this
treadle 22, the tappets can be moved so as to allow the spring 31 to draw the end's
of the rods 15 towards one another, and so slide the tappets 1. 1 out of line with
the cones.
The ends of the connecting rods 15. 15 work in the slide or collar 30, and are
connected and drawn towards one another by the spring 31 as described when the
beaks of the tappets 29 are in the vertical direction.
For reversing the movement of multiple shuttle boxes, we employ a clutch 34
(see Figs. 3, and 4) between the bevel wheels 35. 35, which are loose on the
shaft 36 carrying the pattern mechanism 2, and are driven in the usual manner by
the bevel wheel 37 on the upright shaft 38, which is driven from bevel wheels
connected to the star wheel, which is turned and locked at every pick by the clutch
barrel of the box motion on crank shaft as described in Specification of Patent
No. 16110 of the year 1886 granted to Frank Leeming. The clutch 34 is controlled
by the fork lever 39 which is fulcrumed at 40, and by rod 41 to which a sliding
motion can be imparted by the rod 42 extending to the front of the loom, and
provided with a locking device which allows either of the wheels 35. 35 to be
fastened by the clutch 34 on the shaft 36.
The rod 41 has a swivel joint 42 on it, on each side of which joint there is a
spiral spring 43, for the purpose of shooting the clutch into its holding recesses in
the bosses of the bevel wheels 35 when they move opposite to one another, and the
said swivel 42 is supported by the lever 44 attached to a stud in the bracket 45
fixed to the frame of the loom.
1

page_text: Having now particularly described and ascertained the object of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is.
(1.) In positive dobbies, the use of a moveable propping bar 2 in connection with
a cranked slotted lever such as 7; and draw bars 11, as and for the purpose herein
described and as illustrated by Figs. 1 and. 2 of the accompanying drawings.
(2.) In positive dobbies, the use of a moveable propping bar connected with and
operated by the ordinary draw bar, for the purpose herein described, and sub-
stantially as illustrated by Figs. 1 and 2 of the annexed drawings.
(3.) The general construction, arrangement, and combination of parts constituting
the improved apparatus for operating and controlling the sliding tappets 1.1, as
herein described, and as illustrated by Figs. 3, 5 and 6 of the accompanying
drawings.
(4.) The star wheels 6, 7, connecting rod 9, cranked levers 10. 10", connecting
rod 15, and sliding tappets 1. 1 all in combination, as and for the purpose herein
described and substantially as illustrated by Figs. 3 and 5 of the accompanying
drawings.
(5.) The bevel wheels 35. 35, clutch 34, fork 39, rod 41, rod 42, and lever 44,
with swivel joint 42* and springs 43, together with the pattern mechanism 2, all in
combination and as and for the purpose herein described, and as illustrated by
Figs. 3 and 4 of the accompanying drawings.
(6.) The treadle lever 22, link 21, lever 20, bell crank levers 17. 17, links 16
connected to the levers 10. 10 tappets 1. 1 and apparatus for operating and
controlling said tappets all in combination as and for the purpose herein described
and as illustrated by Figs. 3 and 5 of the annexed drawings.
Dated this 20th day of December 1893.
GEORGE HERBERT HODGSON,
FRANK LEEMING,
By their Agent, Walter Brierley,
Penny Bank Chambers, Halifax.