IMPROVEMENTS IN LOOMS FOR WEAVING DOUBLE PILE FABRICS
Year: 1883

page_text: "
PROVISIONAL SPECIFICATION left by Alexander Melville Clark at the
Office of the Commissioners of Patents on the 22nd August 1883. Com-
municated to him from abroad by Frank Charcot, of Paterson in the County
of Passaic and State of New Jersey, United States of America.
ALEXANDER MELVILLE CLARK, of the firm of A. M. and W. Clark of 53 Chancery
Lane in the County of Middlesex, Fellow of the Institute of Patent Agents
'IMPROVEMENTS IN LOOMS FOR WEAVING DOUBLE PILE FABRICS." [Communicated
to him from abroad by Frank Charcot, of Paterson in the County of Passaic
and State of New Jersey, United States of America]
This Invention relates to improvements in looms for weaving double pile fabrics,
and consists in delivering mechanism constructed with clamping bars and clamping
roller between which the pile warps are passed; said, bars and rollers being mounted
upon a frame and provided with means operated from the hooks of a Jacquard
mechanisın, whereby the said bars and rollers are caused -to clamp and carry
forward the pile threads, as hereinafter described.
The pile-forming threads pass between the threads of the lower ground warp,
and over a guide roll placed between the two sets of ground warps. The pile
threads then pass between a pair of horizontally moveable clamping bars also
situated between the two sets of ground warps the lower bar of which has its
ends received in horizontal grooves in suitable frames, whilst the upper one can
move freely between the frames.
The upper bar is kept in place upon the lower one, by guide pins, attached to
the one and passing through guide holes in the other, and it is held up from the
lower bar by springs, interposed between them and partly received in recesses in
the adjacent faces of the said bars so that the said faces can be pressed close
together. The springs can be further secured in place by being placed upon the
shank of the screw bolts, which pass through holes in the lower bar, and are
screwed into or otherwise secured to the upper bar.
To these two bolts are hinged a pair of levers, which are curved downward and
forward and are rigidly connected, so as to work together. Upwardly projecting
curved portions of these levers near their hinged ends come against the lower side
of the lower clamping bar, and serve as rolling fulcra to the levers so that by
raising the forward ends of the said levers the upper bar, will be drawn down

page_text: upon the lower one, to clamp the pile threads between them. To the ends of the
lower cross bar are attached short rack bars, which are parallel with the grooves
in which the ends of the bar are guided.
With these racks gear wheels operated by a pair of levers rigidly connected at
their forward ends, so that they will move together.
By raising the first mentioned pair of levers, the pile threads will be clamped
between the bars, and by raising the second pair of levers, the clamping bars, will
be moved forward to give the pile threads, the slackness, necessary in forming
the pilo.
These pairs of levers are respectively connected with the books, of the Jacquard
mechanisin so that the pile threads will be clamped and drawn forward automatically
at the proper times.
The pile threads necessary to form the pattern will be raised and lowered at the
proper time to be interwoven with the upper and lower warp threads which form
the two ground or body webs, by the harness in the usual manner.
The gear wheels above mentioned also gear with wheels, attached to the ends of
the lower one of a pair of rollers between which the pile threads pass after leaving
the clamping bars. The journals of the lower roller revolve in vertical slotted
bearings in which are also received the journals of the upper roller, which revolve
in bearings in the ends of a pair of levers, whereby the roller can be lowered and
raised.
د
The levers are rigidly connected, so that they will move together, and are
connected with a hook, of the Jacquard mechanism, so that they will be operated
automatically at the proper times to clamp the pile threads between the rollers,
after which the rotary movement that is imparted to such rollers through the
gearing will give them the necessary slackness.
The clamping bars or the clamping rollers, can be used separately, or the bars
and the rollers can both be used at the same time. The latter arrangement is
preferred, as being more certain in its operation, the bars and the rollers being
so geared as to carry the pile threads forward through the same space.
The bars and the rollers, can be faced with rubber or other suitable soft material
to prevent them from slipping upon the pile threads.