An Improved Dobby for Operating the Healds of Looms for Weaving.
Year: 1888

page_text: Date of Application, 25th July, 1888
Specification Accepted, 31st Aug., 1888
An Improved Dobby for Operating the Healds of Looms for
Weaving.
I, ROBERT HENRY PLACE, of 221 Padiham Road, Burnley, in the County of
Lancaster, Weaver, 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:-
-
My invention has reference to an improved arrangement and construction of
dobby for operating the healds of looms for weaving, the object of my improvements
being to simplify. the mechanism, whilst at the same time to make the dobby more
positive in its action.
In carrying out my invention, which refers to a double lifting dobby, that is to
say, to a dobby wherein the operating levers are moved twice for one revolution of
the tappet shaft, I employ a series of vertical hanging lever arms, one for each heald.
The upper ends of these lever arms are connected to rods carried at each end of two
levers or beams, which beams are fastened to a shaft capable of being rocked or
oscillated by lever and rod and crank from the tappet shaft of the loom, in such
manner as to give the hanging lever arms a continuous rising and falling motion.
I also employ a series of jack levers, in number corresponding to the number of
hanging levers. These jack levers are connected at one end by a cord or other means
to the healds, whilst the opposite ends of such jack levers are notched, so that when
the hanging levers are pushed forward by a pegging barrel or other equivalent
mechanism, the lower ends of the said hanging lever arms are placed into position
so as to catch on the top of the notched end of the jack levers, whereby such jack
levers are caused to oscillate upon their shaft for the purpose of raising and lowering
the healds.
i
Such being the nature and object of my invention, I will now proceed to describe
the same more fully, and for that purpose make reference to the accompanying sheet
of drawings illustrative thereof, wherein Fig. 1 is an elevation of mechanism con-
structed and arranged according to my invention. A represents the hanging lever
arms, carried upon studs or short shafts B and B', which studs are connected to two

page_text: The
levers or beams C fastened by set screws or other means to a cross shaft D, which
shaft is caused to rock or oscillate through the medium of lever E, connecting rod F,
operated by crank from the tappet shaft of the loom in the ordinary manner.
jack levers are represented at G and they are allowed to oscillate upon the shaft or
stud H. These jack levers are connected at one end by cords I to the healds in the
ordinary manner, whilst the opposite ends of such jack levers are notched as
indicated at a for the purpose of receiving when required the lower ends of the
hanging levers A as shewn in dotted lines Fig. 2. The hanging levers, which have a
continuous rising and falling motion imparted to them through the medium of lovers
and rods E and F, are, when selected by the pegs on the pegging barrels J, forced
inwards (see dotted line Fig. 2) so that on the next downward movement of the said
levers their lower ends will catch into the notches formed in the jack levers ;
whereby such jack levers will be forced downward, the effect of which is to raise the
healds; spiral springs or other form of mechanism being employed to operate the
jack levers in the opposite direction, as is usual with dobbies. In order that the jack
levers may not rise too high a rod bis placed across the machine, and to prevent
either of the hanging bars A being pushed too far forward, a bar c is employed,
against which the hanging levers are forced ready for being lowered on the end of
the jack levers. A grate d is also employed for the purpose of steadying the hanging
levers and keeping them in proper position. The pegging barrels are geared
together by spur wheels K as shewn in the drawings, and they are caused to revolve
intermittently at each downward motion of the lever E, and this is offected through
the medium of the pawl or catch L taking into the teeth of the ratchet wheel e on
the end of one of the pegging barrels. It will therefore be seen that each time the
lever E descends the ratchet wheel and pegging barrel are caused to move one tooth,
such intermittent motion being communicated to the other pegging barrel by the
spur wheels K, therefore, as the various hanging levers are selected and operated by
the pegging barrel, the jack levers and healds are operated so as to open the shed.
In order to prevent breakage of the parts and to ensure the proper action of the
hanging levers, flat springs fare employed for the pegs on the pegging barrel to
strike against; but if necessary the hanging lever arms may be operated upon direct,
as shewn in Fig. 2, where the forward end g of bell crank levers M operates the
hanging levers direct as will be easily understood from the explanation already
given.
By the construction and arrangement of a dobby as herein shewn and described,
the mechanism is certain in its action and simple in construction, and wear and tear
of the parts reduced to a minimum.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, 1 declare that what I
claim is :-
Firstly. In a dobby, the employment of oscillating hanging lever arms for
operating jack levers in manner substantially as herein shewn and described.
Secondly. In a dobby, the combination of oscillating hanging lever arms, pegging
barrel or its equivalent, and jack levers, all arranged substantially as shewn and
described.
D
11 Qul 1
Ր T 1
1000