Improvements in Jacquard Mechanism for Weaving Looms.
Year: 1890

page_text: ate of Application, 8th May, 1890
¡omplete Specification Left, 9th Feb., 1891-Accepted, 14th Mar.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Jacquard Mechanism for Weaving Looms.
We, JONATHAN WILKINSON and THOMAS WILKINSON, of the firm of Wilkinson
Brothers, Borough Mills, Manchester Road, Bradford, Jacquard Machine Makers.
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in double lift Jacquard mechanism for
weaving looms particularly applicable to that class of mechanism in which double
wires or uprights are used and a stationary grate is employed to support any of
such wires when the nature of the pattern requires them to remain up during two
or more consecutive picks, and its object is to prevent the wires as they descend
catching the ascending grate or griffe and being again raised.
The said improvements consist in imparting a slight oscillating or backwards
and forwards motion to the griffes or lifting grates as they are raised so as to move
them clear out of the way of the hooks of the descending wires and allow such wires
to pass without catching.
For this purpose we preferably mount said griffes or grates in a swing or sliding
frame or upon levers or links pivoted to a suitable frame and we fix a projection
preferably carrying an anti-friction roller upon or connected to said grates arranged
to engage a tappet as said grates are being raised and deviate them from their
vertical course as they pass the hooks of the descending wires or uprights and
prevent them catching. The said tappet is loosely pivoted so as to readily swing
over and allow the grate or griffes to descend in the ordinary manner without
deviating from a vertical course.
Dated this 7th day of May 1890.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Jacquard Mechanism for Weaving Looms.
We, JONATHAN WILKINSON and THOMAS WILKINSON, of the firm of Wilkinson
Brothers, Borough Mills, Manchester Road, Bradford, Jacquard Machine Makers,
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 relates to improvements in double lift Jacquard mechanism for
weaving looms particularly applicable to that class of mechanism in which double
wires or uprights are used and a stationary grate is employed to support any of
such wires when the nature of the pattern requires them to remain up during
two or more consecutive picks and its object is to prevent the wires as they descend
catching the ascending grate or griffe and being again raised.
The said improvements consist in imparting a slight oscillating or backwards
and forwards motion to the griffes or lifting grates as they are raised so as to move
them clear out of the way of the hooks of the descending wires and allow such wires
to pass without catching.
For this purpose we preferably mount said griffes or grates in a swing or sliding
frame or upon levers or links pivoted to a suitable frame and we fix a projection
preferably carrying an anti-friction roller upon or connected to said grates arranged

page_text: to engage a tappet as said grates are being raised and deviate then from their
vertical courus they pass the hooks of the descending wires or upright and
prevent them eatching. The id tappet is loosely pivoted, so as to readily swing
over and allow the grate or griffes to de end in the onlinary manner without
deviating from a vertical course,
To fully describe our invention reference is made to the accompanying sheet of
drawing forming a part of this Specification, in which imilar letters of reference
indie te corre-pouling parts in each of the figures,
Figure 1, sctical sertion of the two grate on the point of passing each other,
and such other parts of a Jacquard machine as are necessary to illustrate our
improvements.
Figure a pleniew of the sa
Figur 3.4 parate view the lower grate showing the back or the reverse
sidant and repy ented in Figure 1.
Figane is
lar view of the upper gente,
The Al A' of the lower grate and fixed at each end in levers B pivoted
on studs a rivetel in the vertical projections ( of the end save 1 provided at each
m. An ordinary lide rod Eicured in each end pier 1 to raise and lower
the grate in the u mal manner. The lever Bach end ce coupled together at
the bottom by mean of the compling rod F and are normally held in an approxi
mately verticalition by their spring mounted under tension between the
stud d on the rod F and the tuid on the lower projection 11 of the muul piece D.
- that the tension of such spring draws the rod Fin the direction of arrow 1 until
the adjusting screw in the lug of such rod comes against the projection IP on
the end piece Dum so holds the levers B firm and tendy. The rol carries a
projecting anti-friction roller J arranged to come in contact with the nose 7 of the
appet or catel K pivoted on the stud fixed to the side frame of the Jarquard.
The side frame omitted from the drawing, with the exception of a small portion L.
represented in Figure 2 with the tuul msttached.
The tappet Kio arranged that when the lower grate is rising and its bars or
griffe And Aare about to pay the bars A and Ad of the upper grate the
roller come in contact with the inclined nose of the tappet which pushes such
roller aside that the rod is moved in the reverse direction to the arrow 1, thus
inclining the levers Bas represented in Figures 1 and 2 and leaving wider spaces
between the bars A and As for the hooks a, of the descending uprights M carried
by the upper grate, to pass but as soon as the roller d is clear of the tappet the
rod F and levers B return to their normal position under the influence of the
spring (. To more markedly show the movement of the levers B and bars carried
thereby it is lightly exaggerated in the drawing but it is obvious that sufficient
space must be left between the bar and to allow uprights lifted by the
bars A to pass, although owing to the general inclination of the bars and the
rounded end of the hooks being uppermost so great a space is not required.
When the grates are ascending the tappet K is held rigid by its pendent arm »
bearing against the stud projecting from the side fraine but when the grates
descend the roller strikes the tappet above the nose causing it to swing over on
its stud and allow the grate to pass without deviating it.
The bars A and A of the upper grate are fixed at each end in slide pieces O
coupled to the end pieces D' by the links B and B and such slide pieces are
normally held with the adjusting screw fitted in the projection 112, against the
link B' by the spring G'stretching between the projection 11ª and the stud on ().
The slide piece () is provided with an anti-friction roller to engage the nose
of the tappet K' mounted on the stud fixed to the side frame L and arranged to
deviate the slide pieces and bars A and A³ each time the upper grate is lifted in
the usual manner by the slide rail E. In the drawing the upper grate is represented
as it is desconding and in the act of turning the tappet K₁ on its stud to allow it to
pass vertically. Such tappet is provided with a pendent arm to engage the

page_text: stud and hold it rigid when the anti-friction roller J engages its ¹ as the upper
grate is lifted.
When the uprights are lifted their hooks R rest upon the stationary grate P and
they remain up if required two or more consecutive picks.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what we
claim is :-
Constructing or arranging the griffes or grates of a Jacquard to deviate from
their vertical course, substantially as herein shown and described and for the purpose
specified.
DRACUP & NOWELL,
Bradford, Agents.