Improvements in Tappets or Treading Motions for Looms.
Year: 1895

page_text: Date of Application, 4 h July, 1895-Accepted, 10th Aug., 1895
COMPLETE SPECIFICATION.
Improvements in Tappets or Treading Motions for Looms.
I, HUGH ROBERT Ross, of Bloomfield, Belfast, in the County of Down,
Ireland, Manufacturer, 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 primarily to tappet motions for looms in which the chain
of tappets are mounted upon a sliding shaft whereby they can be moved to one side
or the other to bring different sets into operation though it may also be applied to
tappet motions in which the lateral movement is given to the levers.
The invention is designed with the object of obtaining a longer dwell between
the successive changes of the healds to enable the shuttle to pass through the shed
of wide cloth and at the same time to make a heavier and firmer cloth.
It consists essentially in constructing the revolving chain with non-rotating links
of desired shape securely bound together to make them rigid instead of with
rotating bowls and in fitting bowls in the treadle levers to work over the links of
the chain.
It will be fully described with reference to the accompanying drawings which
show the tappet motion removed from the loom.
Fig. 1. Side elevation.
Fig. 2. Longitudinal section.
Fig. 3. Plan with levers removed.
Fig. 4. Extended plan of the chain.
Fig. 5. Longitudinal sectional elevation on line a-x Fig. 4.
Fig. 6. Transverse section on line y-y Fig. 4.
Fig. 7. Transverse section on line - Fig. 4.
The tappet is constructed with a chain A rotating round the shaft a which is
capable of longitudinal movement and with levers B which are actuated by the
chain A and by which the healds of the loom are actuated.
The chain comprises a number of links C pivoted together of such a shape as to
extend outwards to engage or come in contact with the ends of the levers B. The
links C are pivoted together on pins or studs D which extend across the chain upon
which they are free to move and transversely they are bolted together by bolts c so
that each set of links shall move together and when uppermost maintain the same
level. The pins or studs D on their outer ends carry small bowls d which engage
with the teeth of the chain wheels by which they are driven and stamped
links e which prevent the bowls d slipping off the chain wheels E.
The faces of the links C are either raised to such a height as to lift the levers B
or to allow the levers to pass over them without being raised some of the links
having a lifting face only others have no lifting face whilst others have a face at
both levels. The width of the links C also varies according to the requirements
of the pattern so that the distance the chain A is moved laterally relative to the
levers B determines what alteration of the pattern will take place.
The levers B are each fitted with a friction bowl or runner H to engage with
or rest upon the links C of the chain A in substitution for the bowls formerly
comprising part of the chain.
It is to be understood that chains constructed according to this invention may
not only be applied to tappets in which the chain shaft has a lateral movement
such as described but may also be applied to the tappets in which the lateral

page_text: movement is given to the treadle levers, or without any lateral movement when
cloth of only one design or pattern is required.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. In a tappet motion for looms a chain constructed with a number of links
provided with working faces raised or not as required pivoted together on pins or
studs and preferably attached together by bolts or the like substantially as
described.
2. A tappet motion for looms having the operating parts constructed and
arranged together in combination substantially as described and shown.
Dated this 3rd day of July 1895
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.