Improvements in Loom Change-box Mechanism.
Year: 1892

page_text: COMPLETE SPECIFICATION.
Improvements in Loom Change-box Mechanism.
y
1 HERBERT JOHN HADDAN of the firm of Herbert & Co., Patent Agents of
18 Buckingham Street Strand W.C. London Civil Engineer do hereby declare the
nature of this invention, a communication to me from abroad by Miguel Corominas
Serra of 5 Plaza de la Constitucion, Barcelona, Spain, Manufacturer and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement :-
The improvements in the change box mechanism of those mechanical looms
known as rack looms which constitute the principal object of the present invention,
present as a characteristic and advantageous feature the placing of the needle
mechanism which governs the movements of the change box in the upper part of
the loom instead of in the lower part as has been heretofore customary.
Several practical advantages arise from this rearrangement of these parts of the
loom; first the needles whose action requires to be exact are not so liable to
become choked with flocks as they are when in the under part of the loom, and
where as is inevitable dust and flock settle upon them it is more easily removed
owing to their more accessible position; secondly the oiling and general cleaning
of the mechanism is for the same reason rendered casier, the mechanism is more
easily supervised and adjustments and repairs simplified.
The mechanism adapted to enable the needle mechanism to be placed as described
is shown in the annexed drawing in which
Fig. 1 is a side elevation of such parts of the loom as are necessary to explain
the present invention.
Fig. 2 is a portion of the pattern chain extended.
Fig. 3 is a plan view of the needle mechanism.
Fig. 4 is a detail view on a larger scale of the shaft K and its mechanism.
Fig. 5 is a similar view of the mechanism on shaft D.
Fig. 6 is a side elevation of part of the latter mechanism.
The beam M which carries the pattern chain N is journalled in the upper ends
of levers L pivoted at Land curved forward so that their lower arms rest upon
the cams K on the shaft K to which rotary motion is given from the motor
which drives the whole loom. The spring keeps the lever L in contact with
the cam K and it is obvious that by rotation of the latter the bean M is caused
to approach and recede from the needles directed towards it. The chain N is
stretched on the barrel O by the spring P and the beam M is revolved at each
stroke in the known way by ratchet wheel and fixed ratchet finger 2.
=
The change box A is carried by the rod B B which is provided with teeth near its
lower end to serve as a rack engaging with pinion C. On the same shaft D with the
pinion C is also a toothed pinion E about which a fork passes so that either the one
limb For the other F engages with the pinion E on the one side or on the other
respectively cach of these limbs being provided with teeth for that purpose. The
fork F F is pivoted above at G on the end of a lever H pivoted at I and resting
upon a cam on the shaft K or on the cam Jon the same shaft. The
lever His provided with an anti friction roller J" to rest on either of the
cams JJ. These two cams are used for different speeds and for that purpose
are fixed on a sliding sleeve m moved endways by lever pivoted at 7, against the
counter action of the spring n. The cam Jor Joscillates the lever H. which lifts
and lowers the fork F F and revolves in the one or other direction the pinion E
according as the one or other branch of the fork is in gear with the latter. The
movement is communicated to the change box through the pinion
If however the fork is held in a central or intermediate position its movement is
without action on the pinion E and consequently on the change box
P
and rod B.

page_text: The accurate adjustment of the change box in each of its positions is provided
for by a disk T on the shaft D having as many faces as there are compartments
in the change box. These inwardly curved faces engage with a similarly curved
cushion or shoe on a lever Y pivoted at Yand pulled by spring X to bring the
shoc in contact with the disk.
e is an oscillating piece connected with the batten
and forming no part of the present invention; the spring a is connected to a lug d
thereon and to an arm on the rod B.
The movement of the change box is, as to its direction governed by the position
of the fork F F with the one or other arm in gear with the pinion E.
This is effected through the rocking lever S pivoted at S¹ and having a recess
at its end S in which a flange along one of the arms of the fork engages.
The lever S may thus rock the fork without interfering with its longitudinal
movement.
The distance of movement of the change box is however governed by the
amount of movement of the fork which corresponds to the use of cam J or J.
When it is necessary to change the speed of movement this is done by rocking
the lever p.
1
P.
Both these movements are effected by the needle mechanism shown in plan in
Fig. 3.
The rocking bar pivoted at g carries at its ends the two needles h
one of which is prolonged backward from the pattern beam at R to connect with
the lever S. In the middle between the needles h h is the needle s with the
inclined block thereon acting upon a similar block q' on the end of the lever
When the pattern chain presents two end holes as at N Fig. 2 the needles
both enter and the fork F F remains central and disengaged when it presents one
hole as at N or at N the corresponding needle enters it and the other needle is
pushed back rocking the barf and the lever S and fork F F in the one or other
direction.
Similarly with the central needle s. Whenever this needle enters a hole in the
pattern chain as at N the lever remains unaltered, but when there is no hole
presented to it it is forced back and deflects the lever p bringing the cam in the
place of J and changing the speed of the fork F F¹
When the attendant desires to move the change box by hand the restraining
action of the cushion U on the lever Y may be removed by pressure with the foot
on the end of this lever.
It will be seen from the drawing that the whole of the above mechanism is
outside the side frame of the loom.
Having now particularly described and ascertained the nature of this said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1) In a rack loom change box mechanism the arrangement of the needle
mechanism in the upper part of the loom in combination with the mechanical
devices for operating the fork or double rack arranged exteriorly of the loom
fraine and within view of the operator substantially as herein described.
2) In a rack loom change box mechanism the combination with the rack bar for
moving the change box, and the pinion engaging with said rack of a polygonal
recessed wheel T on the shaft of said pinion and lever Y with cushion U thereon
for the purpose set forth.
3) In a rack loom change box mechanism the arrangement of the mechanical
parts connecting the needle mechanism proper with the change box, all exteriorly
of the frame of the loom for purposes of facilitating inspection cleaning lubricating
adjusting or repairing thereof.
Dated this 29th day of Auroust 1909)
HERBERT & Co.,
Agents to Applicant.