Improvements in Dobbies or Heald Machines.
Year: 1893

page_text: Date of Application, 16th Feb., 1893
Complete Specification Left, 16th Nov., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Dobbies or Heald Machines.
I, MARK LEACH, of Sunbridge Road, Bradford in the County of York, Machine
Maker, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in Hattersley's and other similar
dobbies and its object is to reduce the liability of the catches accidentally slipping
off the pulling knives and also to increase the durability of the said catches
and knives.
For this purpose instead of making said knives with an angular edge to
engage the catches I make the engaging edges rounded or semi-circular and
the hooks of the catches are also made of the same shape or approximately
semi-circular.
A further object of the invention is to facilitate the removal of the whole or
any of the tumblers from the tumbler rod or shaft.
For this purpose I make the hole by which the tumblers are mounted upon the
rod open at the bottom so that they may be lifted off the said rod and I prefer to
form the tumbler fingers on the under side of the tumblers and curve them round
underneath the said rod.
Dated this 15th day of February 1893.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Dobbles or Heald Machines.
1, MARK LEACH, of Sunbridge Road, Bradford, in the County of York, Machine
Maker, 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 improvements in Hattersley's and other similar
dobbies and its object is to reduce the liability of the catches accidentally slipping
off the pulling knives and also to increase the durability of the said catches
and knives.
For this purpose instead of making said knives with an angular edge to
engage the catches I make the engaging edges rounded or semi-circular and
the hooks of the catches are also made of the same shape or approximately
semi-circular.
A further object of the invention is to facilitate the removal of the whole or any
of the tumblers from the tumbler rod or shaft.
For this purpose I make the hole by which the tumblers are mounted upon the
rod open at the bottom so that they may be lifted off the said rod and I prefer to
form the tumbler fingers on the underside of the tumblers and curve them round
underneath the said rod.
Reference is to be had to the accompanying sheet of drawings forming a part of
this Specification in which
Figure 1, represents a cross section of one of the pulling knives with one of the
hooks or catches engaging it.
Figure 2, is a separate view of the hook or catch.
Figure 3, is a side elevation of one of my improved tumblers mounted upon
the tumbler rod with a portion of the side frame of the dobbie shown behind it.

page_text: Figure 4, is a separate view of the tumbler and rod with the latter partly turned
round to facilitate the removal of the tumbler.
In Figures 1 and 2 the engaging edge A of the knife B is made of semicircular
or rounded section to engage the similarly shaped catch C.
In Figures 3 and 4 the hole D by which the tumbler E is mounted upon the
rod F is made open at the bottom G to enable it to be lifted off the rod. But to
prevent the tumbler being accidentally removed from the-rod the opening G is made
less than the full diameter of the rod which latter is formed with a flat side or of
D section so that by turning it round to the position shown in Figure 4 the tumbler
may be lifted off as shown. The finger H of the tumbler projects from the under
side and is curved round as represented in the drawings.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. In a dobbie or heald machine, a pulling knife having a semicircular or rounded
edge and catches formed and adapted to engage said edge, substantially as herein
shown and described and illustrated in the accompanying drawings.
2. In a dobbie or heald machine, the particular form of tumbler and tumbler
rod adapting the tumbler to be lifted off the tumbler rod, substantially as herein
shown and described and illustrated in the accompanying drawings.
3. In a dobbie or heald machine, a tumbler formed with an open bearing for the
tumbler rod adapting it to be easily lifted off said rod, substantially as herein
shown and described.
Dated this 14th day of November 1893.
DRACUP & NOWELL,
Bradford, Agents.