CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING
Year: 1878

page_text: LETTERS PATENT to John Holt, of Bolton, in the County of Lancaster,
Manager in the Employ of Messieurs Barlow and Jones, Limited, for the
Invention of "CERTAIN IMPROVEMENTS IN LOOMS FOR WEAVING."
Sealed the 20th May 1879. and dated the 30th November 1878.
PROVISIONAL SPECIFICATION left by the said John Holt at the Office of
the Commissioners of Patents on the 30th November 1878.
"
JOHN HOLT, of Bolton, in the County of Lancaster, Manager in the Employ of
Messieurs Barlow and Jones, Limited. CERTAIN IMPROVEMENTS IN LOOMS FOR
WEAVING,"
My Invention consists in an improved shedding motion for changing the pattern
so as to form figured or ornamental headings on towels or other similar fabrics
in a more expeditious and simple manner than heretofore.
In performing my Invention I place on the top of the loom a horizontal shaft
driven by an upright shaft working in connection with the crank shaft, and
running from front to back of the loom. On this horizontal shaft are arranged
the tappet plates for working the jacks which actuate the healds; I place 2 tappet
plates for each jack, the number of jacks depending on the nature of the fabric to
be woven.
The jacks are constructed with a fork at one end made to hold a bowl which
works on the surface of the tappet plates giving the required motion to the healds.
The jacks are kept in contact with the tappet plates by means of springs placed
under the healds.
To make the desired change in the fabric I raise the jacks by a suitably arranged
lever placed under them at the opposite end to the tappet which brings the jacks
out of contact with the tappet plates, and by means of a forked lever working in a
collar on the tappet shaft I move it the required distance for bringing into action
the second series of plates for working the border or heading..
The tappet shaft is kept from sliding during the working of the loom by an
adjustable catch attached to the said forked lever.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Holt in the Great Seal Patent Office on the 28th May 1879.
JOHN HOLT, of Bolton, in the County of Lancaster, Manager in the Employ of
Messieurs Barlow and Jones, Limited. "CERTAIN IMPROVEMENTS IN LOOMS FOR
WEAVING."
My Invention consists in an improved shedding motion for changing the pattern
so as to form figured or ornamental headings on towels or other similar fabrics, in a
inore expeditious and simple manner than heretofore.
And in order that my Invention may be fully understood I will proceed to
describe the accompanying Sheet of Drawings.
Fig. 1 is a front elevation; Fig. 2, a plan, and Fig. 3 is an end-view of my
improved machinery for changing the patterns for the headings of towels and other
similar fabrics; a, a, are two sets of tappets fixed on the horizontal shaft 6 running
from the front to the back of the loom and driven by the vertical shaft b¹, which is
actuated by bevel wheels and gearing from the crank shaft or picking shaft;
c, c, are bowls on the jacks c¹; d is a lever for throwing the jacks out of contact
with the tappets when the change is made, which lever has a weighted arm d¹ to
keep it clear of the jacks when the loom is at work; e is a forked lever for sliding
the shaft b to and fro to bring the next set of tappets in contact with the bowls c;
is a collar fixed to one end of the shaft b for the forked lever to take into; f is a
catch for holding the forked lever in the required position; h is a bracket fitted
into an annular groove in the boss of the bevel wheel in the horizontal shaft to
retain the wheel in its position while the shaft slides.
Fig. 4 shews how the bowls c are mounted on the ends of the jacks.
The mode of operation is as follows:-When the body of the towel or other
fabric has been woven by the use of one set of tappets, the attendant stops the loom
and depresses the handle of the lever d to the position shewn in dotted lines in
Fig. 1, thus throwing the jacks out of contact with the tappets, and then by
moving the forked lever e slides the horizontal shaft b, and brings the next set of
tappets above the bowls c when the lever d is again brought into a horizontal
position, and the loom is ready to weave the border or heading. A stud on the
lower part of the forked lever takes into the catch fand prevents the horizontal
shaft b from sliding when the loom is at work. The bevel wheel on the shaft bis
kept in its place by the bracket h.
Having thus stated the nature of my Invention and described the manner of
carrying the same into opertion, I declare that I claim the improved manner
of changing the shedding motion for weaving headings and borders, and par-
ticularly the horizontal shaft driven by a vertical shaft and gearing as shewn and
described, and the improved construction of the jacks as shewn and described.
In witness whereof, I, the said John Holt, have hereunto set my hand and
seal, this Twenty sixth day of May, One thousand eight hundred and
seventy nine.
JOHN HOLT. (L.S.)