IMPROVEMENTS IN TENSION APPARATUS FOR LOOM BEAMS to be as follows:
Year: 1884

page_text: I, JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County
of Middlesex, Consulting Engineer and Patent Agent do hereby declare the
nature of the said invention for "IMPROVEMENTS IN TENSION APPARATUS FOR
LOOM BEAMS to be as follows:-
"
This invention relates to a self adjusting tension apparatus for loom beams for
which Letters Patent have been granted to me bearing date 21st February 1884
No 3705, being a communication to me by the said P. Paris.
The present improvements will be adily understood on reference to the
accompanying drawings in which Fig. 1 shows a perspective view of the tension
apparatus, and Figs 2 to 7 shew detached details. To the axis A fixed at the end
of the lower loom frame is fixed the lever B having an inclination of 1 in 20
imparted to it by a screw nut a Fig. 2 on the screwed spindle U connected to the
brake apparatus of the loom beam and passing through a loop y fixed to the
lever B. This lever carries a small roller C Fig. 1 from a hook D of which is
suspended a weight E. This weight tends to move the roller towards the axis A
on account of the inclination of B. To the hook D is attached the end of a cord I,
which passes round one of the two grooves of a pulley F carried on a fixed axis at
the middle of the loom, and has its other end attached to another pulley G with
double groove, loose on its axis which carries fixed upon it a second pulley G' of
equal diameter. The second groove of the pulley G carries a cord I that passes
round the second groove of the pulley F, and has its other end fixed to the hook D¹
of the weight E¹ on the second lever B¹.
The second pulley Q¹ also has a cord H which after passing round it, passes
through the loop J of the arm K and through a hole K¹ situated near the axis of
this arm and, returning, has its other end attached to the loop J which can slide
along the arm K, but is secured in position by a setting screw. By passing the
cord in the manner described, a certain extent of motion imparted to the loop will
cause the weights E E¹ to travel double that distance upon the levers, causing
them to effect the desired variation of pressure. The vertical axis of the arm K
is extended above and is formed at its upper end with a double bend L on which
is pivotted the frame M of a small roller M².

page_text: Assuming the loom beam to be wound with warp to a certain extent, then the
vertical axis M of the roller M¹ will be removed from the beam to an extent
corresponding to the thickness of the convolutions of the warp, as indicated by the
dotted line at N. By this movement the loop J of the arm K, which is fixed to
its axis L, will be brought into the position Ŝ and the weight E will thereby be
moved into the position at O.
As the warp is gradually drawn off from the beam the roller M' will approach
the latter to a corresponding extent, because the weight E, on account of its
tendency to descend along the incline of the lever B, will always keep the roller
pressed against the warp, until eventually it bears against the beam itself, when
its axis will have assumed the position P, while the loop J of the lever K
will have arrived at the position T and the weight at the position R. In
consequence of this movement the weight, which at first will have exerted a
pressure of, say, 110 lbs, will at the end of the motion only exert a pressure of
say 55 lbs.
If it be desired that the weight should exercise a greater pressure at the
commencement, the loop J, which is held in position on the lever K by'a setting
screw, would have to be moved farther towards the outer end of the lever K
whereby the weight E will be moved towards the end of the lever, say to the
division 140 and will consequently act with a correspondingly increased pressure.
On again filling the beam with warps, the lever K will assume the position N¹
as before, and at the end of the weaving operation it will have moved through
the distance from N¹ to P¹, while the weight will have moved from the division
140 to 70.
This weight in gradually diminishing the pressure upon the loom beam as the
weaving proceeds, will give a pressure equal to its own weight when it reaches the
point where the brake apparatus of the beam is connected to the lever, and in
travelling still farther it will eventually relieve the beam of all tension. In
arranging the apparatus for action the lever K must be at right angles to the loom
framing and consequently to the loom beam, while the elbow L of its axis will be
parallel to the beam, and the roller M¹ carried thereby will be removed from the
surface of the warps on the beam a distance equal to one balf of the total extent
of its motion. The arm K describes an arc N¹ K P¹ such that the chord P¹ N¹ of
this arc is equal to the distance to be passed through by the weights E El on the
levers B B¹
A brake apparatus constructed as shewn at Fig. 2 is applied to the loom beam
replacing the cord used heretofore, over which it has the advantage of not being
subject to atmospheric influences nor of adhering more or less to the loom beam,
whereby faults in the weaving are produced.
The apparatus is constructed as follows: A steel band V of the same width as
the pulley of the loom beam has a forked lug X Figs 2 and 3, into which fits a
lever Y, pivotted thereto by a pin Z Fig. 3 at about the middle of its length, the
pin being readily removeable. The lever Y turns freely upon this pin and upon
another one passing through its rear end and carried by the forked piece Q. The
front end of the lever has an eye on to which is hooked the end of a screwed
spindle U the lower end of which passes through the loop y on the lever B, which
it supports by the nut x, as above described.
The rear end of the forked piece Q has a hole by which it is connected, by a
screw with countersunk head C¹, to the end of the steel band V, through a slotted
hole X' Fig. 6 of which the screw passes and is secured by a nut Z. The slotted
hole X allows of the adjustment of the band V upon the pulley of the loom beam
so as to exert a slight frictional pressure thereon without appreciably impeding its
rotation. To a pin in the lower part of the forked piece Q is pivotted a screwed
spindle U¹, having a nut b at about the middle of its length, against which bears a
caoutchouc washer a, the end of the spindle being passed through an arm A¹,
Figs. 1, 2 and 7, fixed to the framing of the loom, and having on the other side
thereof a second nut d by which the spindle is drawn so as to compress the

page_text: caoutchouc washer alightly between the nut b and the arm A'. The washer is
thus made to act as a spring, whereby the loom beam can be turned backwards
when faults in weaving have to be removed. The nut d of the spindle U₁ keeps
the brake always in the same position, and causes the requisite friction of the
band upon the beam pulley to be produced.
As the pin Z acts as the connection for the two ends of the brake band V the
band can be sufficiently loosened for the removal of the loom beam and the
introduction of another one, without requiring any of the other parts to be
disconnected.
ABEL & IMRAY,
Agents for the Applicant,
28, Southampton Buildings,
London, W.C.

page_text: COMPLETE SPECIFICATION.
I, JOHN IMRAY of No 28 Southampton Buildings Chancery Lane in the County
of Middlesex, Consulting Engineer and Patent Agent do hereby declare the
nature of my invention for "IMPROVEMENTS IN TENSION APPARATUS FOR LOOM
BEAMS and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
"و"
This invention relates to self adjusting tension apparatus for loom beams of a
kind such as is described in the Specification N° 3705 of 1884 both inventions
being communications to me from P Paris. By the improvements in the said
apparatus which I am about to describe the tension is rendered regular throughout
the whole web, without requiring such adjustments as must be made from time to
time as the web advances when ordinary tension apparatus is employed. Hence,
with the improved apparatus it is only necessary to make a preliminary adjustment
of the tension, and then the loom can be worked or watched by an unskilled
operatine, producing fabrics superior in regularity and appearance to those usually
produced when adjustment of tension is dependent on the skill of the operative.
The accompanying drawings illustrate the improved tension apparatus, Fig. 1
being a front view Fig. 2 an end view and Fig. 3 a plan. To X part of the lower
framing of the loom is fixed a bracket B having a boss B' through which passes
a pin C fixed in position by a setting screw b. On C is pivotted a lever R having
near its pivot a projecting ear A through which passes a bolt P provided with
adjusting nuts Q above and below A. The bolt P is attached to a brake band,
which may be a steel ribbon lined with cloth embracing a pulley on the beam of
the loom. By means of the nuts the strain is adjusted so as to give the
lever R an upward inclination as shown in Fig. 1. About the middle of X is fixed
an L shaped bracket E vertically adjustable, on the upper face of which is fitted
another bracket F adjustable horizontally. On F is pivotted a bell crank lever
having arms H H at different levels. The upper arm H¹ carries a fork N in which
is mounted a roller O at a height adjustable by a moveable collar M provided with
a setting screw. On the arm H near the pivot is a projection having a hole I
through it.
On His fitted a slide K which can be set at any position on the arm
by a setting screw, and which has through its upper part two holes D and G. A
cord J extends from the hole D where its one end is fixed, through the hole I, back
and through the hole G and then to a hole where it is fixed in a hook T which
carries the weight V and bears by a roller S mounted on it upon the upper edge of
the lever R. The cord J extends from T, passes round a pulley U mounted on the
end of the lever R and thence returns and is fixed to a second hook T¹ similar to T
applied to a second lever R¹ similar to R. When a charged beam is to be placed
in the loom, the roller O is pulled aside and held by means of a temporary tie Z.
When great tension is required, the slide K is set far from the pivot of H the
weights VV being thus moved far from the pivots of the levers R R which carry
them. For more moderate tension, the slide K is moved towards the pivot of H
thus causing the weights V V₁ to act with less leverage. When the beam is placed,
the tie Z is withdrawn, allowing the roller O to bear against the warp in the beam.
As the warp becomes reduced in diameter, the weights V V¹ descend the slope of

page_text: the levers R R¹ and consequently exert less and less leverage on the brake bands
in proportion as the warp yarns have less and less leverage to turn the beam.
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
The construction and arrangement of tension apparatus for loom beams
substantially as and for the purpose herein set forth, and as illustrated by the
drawings.