Improvement in Hawking Machines for Indigo Dyeing.
Year: 1892

page_text: Date of Application, 11th July, 1892-Accepted, 13th Aug., 1892
COMPLETE SPECIFICATION.
Improvement in Hawking Machines for Indigo Dyeing.
I, WILLIAM HENRY COULTER, of Bankfoot Foundry, Batley, Yorkshire,
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 has reference to that class of piece machine commonly called
"hawking" machine employed for indigo dyeing. In this machine nipping rollers are
made to rotate in the dye liquor, between which rollers the fabric passes, but when such
fabric is moistened and wet with dye liquor, it adheres to the surface of the rollers,
and is liable to be damaged thereby. To avoid this, I propose to use scrapers,
composed of thin strips of copper or other material, which will not warp nor get
out of truth by the action of the heated dye liquor, and in order to increase the
strength of the copper strip, I propose to curve it at that part which comes in
contact with the surface of the roller. This scraper is attached to a hinged
longitudinal bar, and thumbscrews are employed to adjust the pressure of the
scrapers upon the surface of the roller.
In order that my invention may be more clearly understood, I will now make
reference to the annexed sheet of drawings, wherein
Fig. 1 is section of such portions of a hawking machine for indigo dyeing as is
necessary to shew the application thereto of my invention.
A and B are the nipping rollers, the latter of which is driven positively by
suitable gearing. These rollers are mounted in framework C, and they are
immersed in the dye liquor, and the fabric which is being dyed passes through the
liquor and between the said nipping rollers. My improved scrapers are shewn at D
and E, and they are capable of oscillating when required upon the pin or hinge a.
The lower edge of these scrapers are in contact with the surface of the rollers, the
point of contact being opposite the axis of the said rollers, or slightly above it, which
position is of importance, and the said scrapers can be made to bear with more or
less pressure upon the said rollers by means of thumbscrews F. In order to
strengthen the scrapers they are curved or bent as shewn at b, but this curve,
addition to strengthening the scraper, will, as the edge wears away, continue to
present to the said rollers a sharp clear edge, which is not the case with scrapers
at present in use. By constructing these scrapers of copper or other material
which will not warp nor lose its parallel, their action upon the surface of the
revolving rollers will not groove nor flute the rollers as is commonly done with other
scrapers, consequently the wear and tear and frequent repairing of the rollers will
be reduced to a minimum, whilst the damage to the cloth caused by uneven rollers
and scrapers will be prevented.
in
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 1
claim is :-
Firstly. In a hawking machine, the combination with nipping rollers of a metal
scraper placed in such position that the point of contact of the latter is at right
angles to the axis or a little above it, as described and shewn in the drawings.
Secondly. In a hawking machine, the combination with nipping rollers of a
metal scraper curved as shewn at b, and where the point of contact of the latter

page_text: is at right angles to the axis or a little above it, as described and shewn in the
drawings.
TASKER & CROSSLEY,
Halifax, Agents.