Year: 1886

page_text: Date of Application, 9th Dec., 1886.
Complete Left, 9th Sept., 1887
Complete Accepted, 14th Oct., 1887.
I, JAMES PINDER, of Parsons Buildings, Moor End, Cleckheaton, in the County of
York, Mechanic, do hereby declare the nature of this invention to be as follows:-
This invention relates to certain improvements to my invention described in
Specification No. 5936 A.D. 1885, and has for its object, the adjustment of the stroke
or pick of the arm or reciprocating bar operated by the eccentric on the crank shaft,
in a more direct manner; and the reduction of the mechanism connected to the warp
beam for operating the same.
I accomplish my object in the following manner :-In connection with the back
beam or bar over which the warp threads pass, I secure together a series of arms
or levers, mount the same on a stud, and balance them with a suitable weight.
One of the arms or levers is prepared with a slot hole, and engages with a projection
on the before named beam or bar, so that when the warp beam 'is letting off more or
less warp than is required, the said beam or bar operates the arms or levers on the
stud; by which the position of the end of one of the arms or levers is changed in its
relation to a curved projection on the oscillating or reciprocating arm, thereby
adjusting the stroke or pick of the said arm.
The stroke of the reciprocating bar may be adjusted by connecting to the back
beam or bar, a bell crank lever mounted on a stud, and coupling an arm of the same
to a rack, with which gears a pinion mounted on a screw engaging with the recipro-
cating bar. When the back beam or bar alters its position, the bell crank lever
and rack are operated, thereby turning the pinion and screw, thus bringing the
reciprocating bar more or less into contact with the eccentric on the crank shaft, thus
altering the stroke or pick of the reciprocating bar.
In order to turn the warp beam, I secure to the boss of the pulley that is operated
by "dogs" and described in the before named specification, an eccentric, upon which
is mounted a toothed wheel that gears with a wheel having internal teeth secured to
the warp beam spindle or shaft attached thereto.
By the first named wheel being carried round in gear with the teeth of the internal
wheel by the eccentric, the internal toothed wheel is caused to rotate and thereby
turn and let off the warp.
1
011
D
1
1000
JOHN WAUGH,
Agent.

page_text: COMPLETE SPECIFICATION
Improvements in Letting-off Motions in Looms for Weaving.
I, JAMES PINDER, of Parson's Buildings, Moor End, Cleckheaton, in the County of
York, Mechanic, 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 certain improvements to my invention described in
specification No. 5936 A.D. 1885 and has for its object the adjustment of the stroke
or pick of the arm or reciprocating bar operated by the eccentric on the crank
shaft in a more direct manner; and the reduction of the mechanism connected to
the warp beam for operating the same.
In weaving, there are what are termed four unknown quantities which must be 1
taken into consideration in addition to the gradation of picks and the increasing
of the speed of the warp beam as the diameter of the roll of warp on the beam
decreases, as described in the before named specification. The four unknown
quantities are as follows: the unequal tension under which the warp is beamed or
dressed; the natural elasticity of the warp threads which causes them to stretch
more or less in passing from the warp beam to the back beam or bar of the loom :
the effect the temperature has upon the warp causing the threads to contract and
relax during the process of weaving: when the weft breaks or is finished, the loom
cannot be stopped without two picks having gone without weft; the two picks are
let back by the slip catch of the positive "take up" motion, which two picks must
also be taken into consideration: these form the four unknown quantities.
By my improvements I can set the warp at the required tension at the commence-
ment of a full beam and am enabled to keep that tension throughout, until all the
warp is "let off."
I accomplish my object in the following manner: In connection with the back
beam or bar over which the warp threads pass, I secure arms or levers, mount the
same on a stud secured to the frame, and balance them with a suitable weight. One
of the said arms or levers is prepared with a slot hole and engages with a projection
on the before named beam or bar so that when the warp beam is letting off" more
or less warp than is required, the said beam or bar operates the arms or levers on the
stud, by which the position of the end of one of the arms or levers is changed in its
"

page_text: relation to a curved projection, or by preference an inclined plane as illustrated
in the drawings.
In order to turn the warp beam, I secure to the shaft of the pulley, which is
operated by "dogs" and described in the before named specification, an eccentric
upon which is secured a toothed wheel, that gears with a wheel having internal
teeth secured to the warp beam spindle: by the first named wheel being carried
round with the teeth of the internal wheel by the eccentric, the internal toothed
wheel is caused to rotate and thereby turn and "let off" the warp.
In the accompanying sheets of drawings, Fig. 1 represents the end elevation of
such portions of a loom as are necessary to illustrate my invention which is added
thereto Fig. 2 a view looking from the back end of the loom Fig. 3 a transverse
section through the loom : Fig. 4 a side view shewing the manner in which the
motion may be obtained by a rack, pinion and bell crank lever: Figs. 5, 6, 7, and 8
are details.
In connection with the back beam or bar D, over which the warp threads W pass, I
secure an arm or lever E mounted on a stud or shaft C secured to the frame end A,
and prepare the end E¹ with a slot hole which engages with a projection D¹ on the
before named beam or bar D. To the said stud or shaft C, but on the out or opposite
side of the frame A, I mount another lever F, and balance the same with a weight F2,
having a rod F¹ secured to a lip G formed on a vertical slide G³ mounted to the
frame A. When the warp beam is "letting off" more warp than is required by
reason of any of the before mentioned unknown quantities or from any other cause,
the said beam or bar D moves in the direction of the arrow and operates the levers
or arms E and F by which means the lip G is lowered on the vertical slide G¹
thereby shortening the stroke of the oscillating or reciprocating arm P¹ which is
operated by the eccentric mounted on the ordinary crank or driving shaft B, by
reason of its coming sooner in contact with the inclined plane P formed on the said
oscillating or reciprocating arm P¹. When the warp beam H is "letting off" less
warp W than is required, the lip G₁ is raised on the vertical slide G thus allowing
the reciprocating bar P' a longer stroke.
The stroke of the reciprocating bar or arm P' may be adjusted by connecting to
the back beam or bar D a bell crank lever L (see Fig. 4) mounted on a stud L' and
coupling the arm L' of the same to a rack M, with which gears a pinion N mounted
on a screw engaging with the oscillating or reciprocating bar or arm P'. When
the back beam or bar D alters its position, the bell crank lever L and toothed rack M
are operated, thereby turning the pinion N and screw O, thus bringing the recipro-
cating bar P¹ more or less into contact with the eccentric C¹ on the crank shaft B,
thus altering the stroke or pick of the reciprocating bar.
In order to turn the warp beam H, I secure to the shaft J¹ of the pulley J which is
operated by the "dog" and described in the before named specification, an eccentric Q,
upon which is secured a toothed wheel Q₁ that gears with a wheel R having internal
teeth secured to the warp beam spindle or shaft attached thereto. By the first named
wheel Q being carried round in gear with the internal wheel R by the eccentric Q,
the said internal toothed wheel R is caused to rotate and thereby turn and "let off"
the warp W.
I regulate the tension of the warp W by means of spring S secured at one end to a
stud at the bottom of the frame A, and having the other end passed through a lip S¹
formed on the lever Y which is secured to the back beam or bar D; and by means
of the nut S', I am enabled to adjust the said spring S to any tension required by the
warp W.
By placing a lever or key on the square ✗ (see Fig. 2) and turning the same, the
attendant can rotate the warp beam as desired.
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 levers or arms E and F in combination with the beam or bar D for the
purpose set forth and described.

page_text: 2. The combination of the oscillating or reciprocating arm P³, inclined plane P,
and vertical slide G¹ for the purpose hereinbefore described.
3. The eccentric Q, wheels Q¹ and R, and pulley J, in combination with the warp
beam H in the manner and for the purpose hereinbefore described.
4. The bell crank lever L, rack M, pinion N, screw O in combination with the back
beam or bar D for the purpose herein set forth.
D
E
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