Year: 1893

page_text: Date of Application, 25th Oct., 1893-Accepted, 20th Oct., 1894
Fig. 2 the cylindrical part or periphery of the drum.
Fig. 3 is a vertical sectional view through the drum and shows the levers which
are connected with the drum, and serve to execute the necessary combination of
movements.
Fig. 4 illustrates the method of applying this mechanism to a dobby loom.
In the cylindrical part (Fig. 2) of the drum a number of openings or slits A, A',
A", A, and B are arranged.
This drum receives rotary motion from the loom when in work and for this
purpose the toothed part C, C, is provided with suitable gearing, which latter is not
shown in the drawing because it can be varied according to circumstances.
The rotary motion may also be imparted by any other means.
Upon the cylindrical surface of the drum rest the dogs D of the levers E, E', in
such a manner that these dogs when meeting one of the slits provided in the drum
surface, sink into or engage the same so that the respective lever rises or falls as
the full or cut out parts of the drum present themselves to its dog. To obtain
these movements in a precise manner, spiral springs F, F, are provided on the
extremities of the levers and attached to any convenient part of the loom; said
springs secure the falling motion of the levers and their adherence on the face of
the drum.
The following is a description of one of the ways in which the drum, shown in
Figs. 1, 2, and 3, of the drawings may be arranged for the purpose of bringing the
dobbies alternately into action and also to set them out of action when making
fringes.
M (Fig. 4) is the frame-work of a dobby loom from which all those parts are
removed which are not required for explanation of the present invention.
N and N' are the shedding motions or dobbies. According as the heald blades
of the loom are actuated by the dobby N or by the dobby N¹, different designs are
produced in the fabric. The dobbies N and N' are acted upon by the pawls O and O¹
and the ratchet wheels P and P¹ respectively. When the dobby N is in action,
the dobby N is at rest, because the wheel Pi thereof becomes removed from the
pawl O' and vice-versa. Both dobbies may be left at rest by bringing them into an
intermediate position when both ratchet wheels P, P', are out of action and in this
case the blades are not moved and the warp thread forms fringes, since no shed is
formed. The picking could then if desired be stopped.

page_text: The ratchet wheels P and P¹ are mounted on a sliding carrier R which slides in
guides Q, Q, upon the oscillating beam S, fulcrumed at S¹ and rocked by the action
of the eccentric T and rod T¹. Owing to this oscillating movement the pawl O or O¹
which remains stationary, forces the respective ratchet wheel to turn whenever it
is in reach of its respective pawl.
The drum shown at Z operates the levers E and E¹ which latter, by action
through levers V, V, V, and V₁, V₁, V₁, cause the carrier R to slide through the
guides Q, said piece R carrying with it the dobbies N and N¹.
When the nose D of lever E rides on a full part of drum Z the lever V, V, V, is
lifted sufficiently to hold the carrier R in its extreine left hand position. When
the said nose D arrives in a slot in the drum, the lever V, V, V, will be drawn
down, and unless impeded by lever V1, V1, V₁, will draw the carrier R into its
extreme right hand position. If at this moment the nose D' of lever E' is riding
on a full part of drum Z the projection E2 on the rod E³ connected to E' will
prevent the lever V1, V1, V₁ from falling further than for an amount sufficient to
bring the carrier R to its intermediate position, but if the nose D¹ is riding in a
slot in the drum Z, the projection E2 will be in a lower position and will offer no
impediment to the carrier R passing to its extreme right hand position.
To save time the cloth beam may be made to roll up the fabric at greater speed
when fringes are being made than at other times.
It is evident that the combination and the arrangement of the openings in the drum
periphery must correspond with the changing motions which are to be effected in
the weft of a textile fabric, and the circumference of the same drum must also
correspond with the length to be given to the separate pieces of fabric. The
length of an orifice or slit must also be proportioned to the length to the given
to a certain design or with the length of the fringe.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
The improved appliance or mechanism for use in dobby looms consisting sub-
stantially of a rotary drum having on its cylindrical surface suitably arranged
orifices or slits, said drum being combined with one or more levers actuated so as
to rise and fall by the movement of the drum and its slits therein, said mechanism
being applicable to dobby looms for causing the changes in the design of the fabric
and the formation of fringes therein, substantially as illustrated and described and
for the purposes set forth.
Dated this 25th day of October 1893.