Improvements in Letting-off Motion of Weaving Looms.
Year: 1898

page_text: Date of Application, 3rd Dec., 1898
Complete Specification Left 4th Sent 1899 -Accepted. 25th Nov., 1899
Improvements in Letting-off Motion of Weaving Looms.
I, DAVID RILEY, of 2, Hollings Mount, Manningham, Bradford, in the County
of York, Stuff Manufacturer, do hereby declare the nature of this invention
to be as follows:
This invention particularly relates to improvements in that class of letting off
motion for looms in which a letting off roller is employed driven from the take
up roller or other equivalent positively driven part.
For this purpose I employ a letting off roller mounted in front of and adjacent
to a fixed beam or "false roller." The warp leaving the warp beam is passed
under and over the letting off roller and down between it and the fixed beam
and then underneath and over the latter into the loom. In order to increase the
pressure between the roller and beam the said roller is mounted in such a
manner that it is capable of a certain amount of lateral motion consequently the
tension on the warp tends to draw it towards and press it against the warp
passing over the fixed beam.
The letting off roller may be driven by a stud wheel and a change wheel and
the latter may be fixed on the shaft of the letting off roller. The stud wheel may
be driven by a sprocket wheel actuated by a chain from a sprocket wheel fixed
upon the shaft of the "take up" roller.
A cam lever or eccentric lever may be provided to throw the letting of roller
out of gear when it is required to turn the warp back again.
To reduce the leverage of the beam weights, on the cords or their equivalent
coiled round the ends of the warp beam, as the diameter of the warp wrapped
upon the beam is reduced I employ a plate or "feeler" to bear preferably upon
the underside of the warp on the heam. A rack fitting a suitable guide is
connected to the underside of the feeler and this rack engages a pinion fixed to
a drum or pulley mounted upon a stud or its equivalent. The beam weight
levers incline more or less down away from the centre of the loom and the weights
are supported thereon by pulleys or runners. The weights are connected to cords
wound on the said drum and when a full beam is being commenced the beam
weights are near the inner ends of their levers and as the warp on the beam
is reduced the drum is rotated thus uncoiling the said cords and allowing the
weights to gradually move towards the fulcrums of the levers.
The weight on only one side of the loom may be operated in this way.
1000
DRACUP & NOWELL,
Patent Agents, Bradford.

page_text: Improvements in Lingo MOTION Of wearing Looms.
I, DAVID RILEY, of 2, Hollings Mount, Manningham, Bradford, in the County
of York, Stuff Manufacturer, 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:.
-
This invention particularly relates to improvements in that class of letting off
motion for looms in which a letting off roller is employed driven from the take
up roller or other equivalent positively driven part..
To fully describe my invention reference is made to the accompanying sheet
of drawings, forming a part of this specification, in which similar figures of
reference indicate corresponding parts in each of the views.
Figure 1, represents a back view of such parts of a loom as are necessary to
illustrate the application of my improvements.
Figure 2, is an elevation of the same.
66
Figure 3, is a cross section of the back part of the loom on a larger scale.
The letting off roller 2 rests upon the fixed beam or false" roller 3 rigidly
secured in the brackets 4, 4 fixed to the side frames 5, 5 of the loom. The
arbor 6 of the roller 2 revolves in slots 7 in the top of the brackets 4, but does
not touch the bottom of such slots. The warp 9 from the warp beam 10 passes
over the roller 2 and between it and the fixed beam 3 then under the latter and
over the ordinary false beam 12 into the loom. By this arrangement the tension
on the warp tends to draw the roller 2 down on the fixed beam and so increases
the "hold" of the roller and beam upon the warp.
The letting off roller has a change wheel 13 on one end driven by the stud
wheel 14 fixed to the sprocket wheel 15 driven by the chain 17 from the sprocket
wheel 20. This wheel 20 is fixed to the stud wheel 21 driven from the spur
wheel 22 on the end of the arbor 23 of the take up roller 24.
To reduce the leverage of the beam weights 24 and 25 on the cords 11 coiled
round the ends 27 of the warp beam 10 as the diameter of the warp wrapped upon
the beam is reduced I employ a
66 feeler"
or roller S to bear upon the underside
of the warp on the beam. This roller is mounted upon a rack 29 fitting guides 30
in the bracket 31 in the bottom back rail 18 and this rack engages a pinion 32
fixed to the drum 33 mounted upon the stud 34 in the bracket 31. The weight
levers 26 incline down away from the centre of the loom and the weights 24
and 25 are supported thereon by pulleys or runners 19. The weights are con-
nected to cords 35 and 36 wound on the said drum and when a full beam is being
commenced the beam weights are near the inner ends of the levers 26. But as
the diameter of the warp on the beam is reduced the feeler is free to rise thus
allowing the drum to rotate and by uncoiling the said cord allow the weights
to gradually move towards the fulcrums 28 of the levers. The cord 36 from the
drum passes round the guide pulley 40 on the rail 18 before passing to the
weight.
A weight acting on one end of the warp beam only may be automatically
adjusted in this way instead of moving the weights acting on both ends.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. The combination with a positively driven letting off roller, of a fixed beam

page_text: arranged in conjunction with said roller, substantially as herein shown and
described and for the purpose specified.
2. The combination with a letting off lever and weight, of a flexible connection
coupling said weight to a drum, a pinion and rack for operating said drum, and
a feeler on said rack bearing against the warp on the warp beam, all arranged
and operating substantially as herein shown and described and for the purpose
specified.
Dated this lat dor of Santambar 1800.
DRACUP & NOWELL,
Patent Agents, Bradford.