An Improved Dobby with Movable Needle-board.
Year: 1898

page_text: Date of Application, 30th Mar., 1898-Accepted, 7th Jan., 1899
An Improved Dobby with Movable Needle-board.
I, MARTINUS CHRISTIANUS SOETERS, of Oldenzaal, Holland, Director of Weaving
Mills, 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 a dobby with adjustable needle-board, which latter is
raised or lowered by suitable mechanism so as as to bring it opposite to the desired row
of holes of a needle-card, having a number of rows of holes. In consequence of this
arrangement only a very small number of needle cards are required.
In order that this invention may be the better understood, I will now proceed to
describe the same with reference to the accompanying drawings and to the letters
and figures marked thereon. Like letters refer to like parts in the various figures.
Figure 1 is a partly sectional front view of the machine.
Figure 2 is a side elevation.
Figures 3, 4, 5, 6 and 9 show details and Figures 7 and 8 show the perforated
needle cards and the corresponding cording or tieing-up.
A card cylinder a is formed by two polygonal discs situated on a common axis. As
shown in the present instance, these discs are pentagons and are surrounded by five
plates b, b1, b2, 63, 64, each of which bas five rows of holes, each row having twenty
five, holes. Around these plates are placed needle cards v¹, shown in detail in
Figure 7, corresponding in number to the said plates, and perforated according to
the pattern to be worked.
Needles c, of which twenty-five are provided in the present case, rest with their
front ends in a common needle-board d, pivotted at the rear on a pivot e, so that the
needles can pass through the higher or lower rows of holes in the needle cards
according to the higher or lower position of the needle board.
The needle-board d rests on two guide rods f provided at each end of the dobby,
the lower ends of said guide rods carrying a rotary axle g. As shown in Figures 1
and 2, the axle g carries ten pins or supports f, f², ƒ³,_ ƒ^, ƒ³, ƒ³, f', ƒ³, fo, f¹º, of
which to point upwards and to f¹º downwards. The supports of each group
are of different length, as regards one another, and in either group the shortest
support is at the left and the longest at the right. The supports f¹ to 10 rest
alternately on one or other of two hexagonal drums k k¹, according to their adjust-
ment, which is effected by a hand wheel h, and such position is secured by a spring
pressed plate i, shown in detail in Figure 4. The drums kk are situated vertically
below the axle g, the drum & being below the supports f¹ to f and the drum k¹ below
the supports to f10. Each face of these drums has a slot k², the length and width
of which corresponds to each group of supports.
The drum in operation, which according to the drawings is k¹, is provided with a
number of cards 1, 11, 12, 13, 14 which are moved by the rotation of the drum k¹ effected
from the cylinder a and can be successively brought below the supports fo to f10. As
shown in Figure 3, the cards 11, 12, 13, and 14 are provided with holes of different
length 15, 16, 17, 18 the hole 15 corresponding to the space necessary for one support,
the hole for two supports, for three supports and 18 for four supports. The

page_text: G
card has no such hole; the holes m in which the transporting pins n engage are
also provided in the other cards.
If the drum is in such a position that the card is directly below the group of
supports to f10 the needle board d, resting on the longest support 10 is lifted
sufficiently high to allow the row of needles c to pass through the upper row of holes,
when the following card with the hole is below the group of supports, the
support f10 falls into it, whereby the support fº comes to rest on the card l'. In
consequence the needle board d is lowered to the extent of the difference of length
between the supports f" and f10 whereby the row of needles c is placed opposite the
second row of holes. In a similar manner the hole of the following card 12 causes
the row of needles c to come opposite the third or middle row, and the hole of the
next card opposite the 4th row. In the last position the supports f, f, f, and 10
are thus brought into the hole 18, the needle-board & resting on the shortest support fo
on card and the row of needles c being opposite the lowest row of holes.
The rotation of the drums k k is caused by the axle of the cylinder a which is
provided with a cog-wheel o outside the cylinder «, which rotates a cog wheel y of
the same size by an intermediate cog wheel p. The wheel is situated on an
asler, carrying a tube 71 on which are situated two discs & s¹, each of which has
a pin engaging in notched star wheels t t. The latter are situated near the
drums kk, one on the right side of and the other on the left side of /. As shown
in Figure 2 the distance between the discs s and is somewhat larger than that
between the two notched star wheels t, t, so that only one of the pins 82² can engage
with its cross t, or neither may be engaged. For these purposes the tube 1 on the
axle may be moved to the right or left. This movement is effected by an axle u
operated in any suitable manner and connected by an arm ¹ to the tube . In
Figure 2 the axle u is not shown and the tube is moved to the left, operating the
drum 1.
It will be seen from the foregoing that the card cylinder a makes six complete
rotations while the drum k¹ makes one complete rotation with six cards, and that
when the cylinder a has made one rotation and all cards have been before the row
of needles c at the desired elevation, the cog wheels o; p, q, the disc & and the
devices t rotate the drum k¹ to extent of one face or card.
Figure 7 showing the cards and Figure 8, showing the corresponding cording
or tieing up will make this operation clearer. The holes which have been "pricked
are shown by black circles. When the needle board & rests on the support f7 which
is the shortest but one, the rows 1, 3, 5, 7, and 9 are pricked. During the next
operation of the drum ¹ the needle board d is lowered to the extent of the distance
between the centre of two rows of holes, so that during one rotation of the card
cylinder a the rows 2, 4, 6, 8 and 10 are "pricked" according to Figure 8.
"
The last needle card ¹ and also the plate 64 of the card cylinder a; have each,
according to the construction shown in the drawings, a slot v², in which engages a
thicker needle c as soon as this card is "pricked" by the other needles c.
A hook w
adapted to swing round a pivot a² passes through this thicker needle c (see Figures 5
and 6) and is brought by the latter into the path of the knife a¹, which is raised or
lowered in a known manner, the hook w being raised with the knife. During this
movement the hook w raises a rack a³ connected to it by the pin a². The rack a³
partially rotates the toothed segment at and operates the cam a thereon which
engages under the roller ³, situated on the supports d¹ of the needle board d, and
lifts the latter over the highest position of the needles. Any supports fo, to f10 or f¹ to ƒ³
respectively, which may be situated in the corresponding slots 5 to 18 are therefore
lifted out of the slots in order to allow the pins 82 to move the drums kor k:
The operation of the machine is as follows:-
:-
A draw bar g', which is reciprocated on the loom by suitable means, oscillates the
card-board cylinder « in the direction of the double headed arrow, Figure 1, the
cylinder à resting pivotally on the axle by means of double healds 2. A rigid
book engages with a pin g' (arranged on the sides of polygonal discs) during the
forward movement of the card cylinder a and effects a partial rotation of the latter,

page_text: which now moves towards the needles c which, as usual, bring the small hooks or
wires h¹ into the path of the knife for the operation of the shafts. The lower end of
the lifting rod h¹ (see Figure 9) is connectel with the piece K7 which passes through
the guide Ks to which piece K7 the cords K K¹ which support the leaf K2 are
connected through the intermediate cord K. To the leaf K2 the cords K³ are secured
which are connected to the levers K' pivotted at K³ and under the action of the
springs Ko.
During the backward or return movement of the card cylinder a a new pin g* is
brought below the hook g³, which during the forward movement of the card cylinder a
feeds one card after the other to the needles in regular succession, as described. After
one rotation of the card cylinder the large hook w lifts the whole needle board d, in
order to raise any supports, which may be in the slots 15 to 18, out of the latter; a
partial rotation of the drum in operation, k or k¹ is effected simultaneously, as before
described, and eventually the adjustment of the needles c to another row of
holes.
If another group of supports, for instance f¹ to f is to be placed into action, the
downward supports fo to fo are moved upwards, and the supports f¹ to f5, which were
pointing upwards, are moved downwards. After moving the tube 1 to the right the
drum and the disc s coact, and so on.
In order to be able to move the card cylinder a backwards in case of any "fault,"
so that a card which has been "pricked" may be brought again before the row of
needles, a double armed lever is pivotted on the double healds 2, as usual, and its
movement effected by hand through a cord 2 causes a projection is to ascend in such
a manner that the card cylinder a noves in opposite direction to the hook g3 which
has become disengaged in the meantime.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I
claim is:
1st. A dobby with needles, in which the latter are raised and lowered by special
cards, in order to use different rows of holes in the needle cards, according to the
elevation of the needles substantially as and for the purpose described.
2nd. A dobby as claimed in Claim 1, in which a pivotted needle board d is adapted
to rest alternately one or other series of supports f for f f10 respectively, the said
supports being or different length, which are adapted to rest on card drums k k¹
(moving only to the extent of one card during the rotation of a whole series of needle
cards) in such a manner that one or other of the supports rests upon the card,
according to the length of slot (to ) of the cards of the drums k; the longer
support, which was in operation previously, entering the holes 15 18, so as to move the
needle board d, with the row of needles c, from the juxta-position to one row of
holes, into the juxta-position to another row of holes substantially as
described.
3rd. A dobby as claimed in Claim 1 in which the "pricking" of the needle card
brings a large hook into the path of the ascending and descending knife a¹, in such
a manner that during the ascent of the hook w the needle board d is moved (by
means of the rack a³, segmental cog wheel a and cam a³) into its highest position in
order to lift the supports f¹ to f10 from the card board slots (5 to 18 and to set the card
cylinder k¹ free to rotate substantially as described.
Dated this 90th day of March 1900
FELL & JAMES
Agents for the Applicant.

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