Improvements in Doctors Employed in the Printing of Textile Fabrics.
Year: 1889

page_text: Date of Application, 13th Nov., 1889
Complete Specification Left, 7th Feb., 1890-Accepted, 15th Mar., 1890
PROVISIONAL SPECIFICATION.
Improvements in Doctors Employed in the Printing of Textile
Fabrics.
I, JOHN ARCHER of 100 Cross Lane, Radcliffe in the County of Lancaster, Calico
Printer do hereby declare the nature of my said invention to be as follows :—
The object of this invention is to so construct a doctor that its front edge shall
be stiffer than heretofore and capable of riding over a wider surface of the engraved
roller without dipping in and so injuring the roller and unduly removing the
coloring matter from those parts and which doctor shall not require to be weighted
heavier than the thinner doctors hitherto employed.
In performing my invention I construct my improved doctor at its front edge of
two or more thicknesses of steel, brass or other suitable metal soft-soldered or brazed
together. In this manner I secure great strength and stiffness at the front edge
whilst at the same time I obtain the required elasticity and suppleness of a thinner
plate at the back part of the doctor. In practice I find that a doctor blade so
constructed as aforesaid is better supported over the entire engraved surface of the
roller than heretofore.
This compounding of the thickness of a doctor blade also renders such blade
more durable by virtue of the greater thickness presented for being filed down from
time to time.
As a modification of my invention I sometimes construct my improved doctor
blade out of a single solid sheet of metal of the desired thickness to form the
front edge and by cutting the back part of the blade down to the degree of
thinness required to afford the necessary elasticity or suppleness of that part.
Dated this 12th day of November 1889.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester, Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Doctors Employed in the Printing of Textile
Fabrics.
I JOHN ARCHER of 100 Cross Lane, Radcliffe in the County of Lancaster, Calico
Printer do hereby declare the nature of my said invention and in what manner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
The object of this invention is to so construct a doctor employed in the printing of
textile fabrics that its front edge shall be stiffer than heretofore and capable of riding
over a wider surface of the engraved roller without dipping in and so injuring the
roller and unduly removing the colouring matter from those parts and which doctor
shall not require to be weighted heavier than the thinner doctors hitherto employed.
On the accompanying drawing Fig. 1 is a plan view of a portion of a doctor
embracing my improvements and Fig. 2 is a transverse section of Fig. 1 on
line a-b.
In performing my invention I construct my improved doctor at its front part of
two or more thicknesses of steel, brass or other suitable metal laid one upon another
(as indicated by letters c and d) and soft soldered or brazed together. In this manner
I secure great strength and stiffness at the front edge e of the doctor whilst at the
same time I obtain the same clasticity and suppleness of a thinner plate at the back
part of the doctor. In practice I find that a doctor-blade so constructed as aforesaid
is better supported by the entire engraved surface of the roller than heretofore.

page_text: This compounding of the thickness of a doctor blade also renders such blade
more durable by virtue of the greater thickness of metal presented for being filed
down from time to time.
As a modification of my invention I sometimes construct my improved doctor blade
out of a single solid sheet of metal of the desired thickness to form the front edge and
by cutting or grinding the back part of the blade down to the degree of thinness
required to afford the necessary elasticity or suppleness of that part.
Having thus 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,―
The improved construction of doctor substantially as and for the purpose herein-
before described.
ated this on day of reoruary.
JOHN G. WILSON,
Patent Office, 55, Market Street, Manchester, Agent for the Applicant.