Improvements in "Doctors" and in the Method of and Means for Mounting the same.
Year: 1891

page_text: Date of Application, 4th Feb., 1891
Complete Specification Left, 5th May, 1891--Accepted, 6th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in "Doctors" and in the Method of and Means for
Mounting the same.
We VICTOR HEROSE of Constanz, in the Empire of Germany, Calico Printer,
and WILLIAM MOULTON of 76 Whitley Street, Rochdale Road, Manchester in
the County of Lancaster, Engineer, do hereby declare the nature of this invention
to be as follows:-
Our said invention relates to "doctors" such for example as are used in connec-
tion with the rollers of calico printing machinery and for other purposes. The
"doctor" as is well understood consists usually of a thin metallic blade placed in
contact with a revolving roller such as an engraved printing roller for example to
remove superfluous colour or the like and so thoroughly to scrape and cleanse the.
unengraved periphery of the roller, before it comes in contact with the goods.
In designs which include lines that run or should run parallel with the axis of
the roller and which at times coincide or may coincide with the straight thin edge
of the "doctor," the use of the "doctor" under existing conditions has this
disadvantage that at the moment of coincidence the edge of the "doctor" drops
momentarily into the engraved line and therefore rapidly wears both "doctor
roller, thus causing a corresponding deterioration in the printed design.
,,
and
To obviate this disadvantage it is at present the common practice to set such
engraved lines helically at an angle more or less to the length of the roller so as to
cross or lie at an angle to the thin edge of the "doctor," and still further to
increase this crossing of the engraved line and the "doctor," the "doctor" is also
frequently set at an opposite angle. By these means the "doctor" instead of
dropping into the engraved lines, bridges them over and thus escapes catching in
the lines. This method of inclining the engraved lines and the "doctor" relatively
to each other is technically known as "slashing" the design and "doctor." When
the "doctor" is to be "slashed" as aforesaid it is first set at the required angle
to the roller and is then pressed against the roller so as to bring the
"doctor in contact therewith throughout its entire length and thus scrape or
remove the superfluous matter or colour from the roller as it revolves. By being
thus forced into contact with the roller the central part of the edge of the "doctor"
bears upon the roller more heavily than the ends, with the result that the roller,
the engraved design and the "doctor" are more rapidly worn away at the centre
than at the ends.
23
To obviate this defect we shape the bed of the shears or clamp which holds the
"doctor ::
to a suitable helical curve and angle which will, by the mere process of
binding the "doctor" in the shears, so shape and form the "doctor" that it will lie
in exact and equal helical contact with the roller throughout its entire length and
without exerting any undue pressure upon the roller at any point in its length.
The shears or clamp being a stiff solid body by virtue of its own self-contained
strength and form grips and shapes the "doctor," which as has been said is thin
and flexible, to the helical curve or angle defined by the shaped and prepared bed
of the shears or clamp. By this means so much angle or
"slash can be given to
the "doctor 23
that the necessity for putting any "slash" or angle upon the
design is or may be done away with and the straight lines of the design may run
parallel with the axis of the roller. Thus the necessity for pulling the goods or
rather the design printed on the goods, straight after the printing operation is also
dispensed with. The "doctor" so held and curved is easily adjusted to rollers of
varying diameter. The shears or clamp may be formed by casting or forging or in.

page_text: any suitable manner, the required helical curve and angle being imparted in the
process of manufacture and finishing.
If it is desired to reciprocate the said curved "doctor" to and fro in the direction
of the length of the roller during working, the clamp or shears may be supported
on rollers or in bearings or on slide or other surfaces which will guide its to and
fro motion. Instead of shaping the straight flexible "doctor" blade to the desired
helical curve by means of the shears or clamp as already described, we might shape,
stamp, cut or hammer the "doctor" blade itself to the required form and secure it.
after shaping to shears or in a clamp or to any other suitable supporting body.
The hereinbefore described "doctor" may be used for ali purposes which necessitate
the use of a "doctor" and more especially when such "doctor" requires to be set
at an angle relatively to the axis of the roller.
Dated this 3rd day of February 1891.
DUTTON & FULTON,
1, St. James' Square, Manchester, Agents.
COMPLETE SPECIFICATION.
Improvements in "Doctors" and in the Method of and Means for
Mounting the same.
We VICTOR HEROSE of Constanz in the Empire of Germany Calico Printer and
WILLIAM MOULTON of 76 Whitley Street Rochdale Road Manchester in the
County of Lancaster Engineer 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 and accompanying drawings
22
Our said invention relates to "doctors such for example as are used in
connection with the rollers of calico printing machinery and for other purposes.
The " doctor" as is well understood consists usually of a thin metallic blade placed
in contact with a revolving roller such as an engraved printing roller for example
to remove superfluous colour or the like and so thoroughly to scrape and cleanse
the unengraved periphery of the roller before it comes in contact with the goods.
In designs which include lines that run or should run parallel with the axis of the
roller and which at times coincide or may coincide with the straight thin edge of
the "doctor" the use of the "doctor under existing conditions has this dis-
advantage, that at the moment of coincidence the edge of the "doctor" drops
momentarily into the engraved line and therefore rapidly wears both "doctor" and
roller thus causing a corresponding deterioration in the printed design. To obviate
this disadvantage it is at present the common practice to set such engraved lines
helically at an angle more or less to the length of the roller so as to cross or lie at
an angle to the thin edge of the "doctor" and still further to increase this crossing
of the engraved line and the "doctor," the "doctor" is also frequently set at an
opposite angle. By these means the "doctor" instead of dropping into the engraved
lines bridges them over and thus escapes catching in the lines. This method of
inclining the engraved lines and the "doctor" relatively to each other is technically
known as "slashing" the design and "doctor." When the doctor is to be "slashed
as aforesaid it is first set at the required angle to the roller and is then pressed
against the roller so as to bring the "doctor in contact therewith throughout its
entire length and thus scrape or remove the superfluous matter or colour from the
roller as it revolves. By being thus forced into contact with the roller the central
part of the edge of the "doctor," bears upon the roller more heavily than the ends
with the result that the roller, the engraved design and the "doctor" are more
rapidly worn away at the centre than at the ends.
>>
To obviate this defect we shape the bed of the shears or clamp which holds
the "doctor to a suitable helical curve or angle which will by the mere process
of binding the "doctor" in the shears so shape and form the "doctor" that it will
lie in exact and equal helical contact with the roller throughout its entire length

page_text: and without exerting any undue pressure upon the roller at any point in its length.
The shears or clamp being a stiff solid body by virtue of its own self contained
strength and form, grips and shapes the "doctor" which as has been said is thin
and flexible to the helical curve or angle defined by the shaped and prepared bed
of the shears or clamp. By this means so much angle or "slash"
the "doctor" that the necessity for putting any
can be given to
"slash 27
or angle upon the design
is or may be done away with and the straight lines of the design may run parallel
with the axis of the roller. Thus the necessity for pulling the goods or rather the
design printed on the goods straight after the printing operation is also dispensed
with. The "doctor" so held and curved is easily adjusted to rollers of varying
diameter. The shears or clamp may be formed by casting or forging or in any
suitable manner, the required helical curve and angle being imparted in the
process of manufacture and finishing. If it is desired to reciprocate the said
curved "doctor" to and fro in the direction of the length of the roller during
working, the clamp or shears may be supported on rollers or in bearings or on slide
or other surfaces which will guide its to and fro motion.
Instead of shaping the straight flexible "doctor" blade to the desired helical
curve by means of the shears or clamp as already described we might shape, stamp,
cut or hammer the "doctor" blade itself to the required form and secure it after
shaping to shears or in a clamp or to any other suitable supporting body. The
herein before described "doctor" may be used for all purposes which necessitate the
doctor" and more especially when such "doctor" requires to be set at
an angle relatively to the axis of the roller.
use of a 33
To render our invention perfectly clear we will now proceed more particularly
to describe the same with reference to the annexed sheet of drawings:-
Fig. 1 is a plan view of the clamp or shears and the "doctor."
Fig. 2 is an elevation of the back of the clamp and "doctor."
Fig. 3 is an end view of Fig. 2 looking from the end marked A.
Fig. 4 is a pure cross section of the clamp and "doctor" say at the line C. D.
Fig. 2.
C
In the respective figs. the roller against which the doctor bears is indicated by
dotted lines. In the example indicated the clamp is composed of two parts viz. the
bed a and the cover b. The relative sectional forms of these parts a and b are
most clearly shown at Fig. 4. The face of the bed a is shaped and finished to the
proper helical curve and the cover is similarly shaped and finished. The thin
flat steel blade constituting the doctor is then placed between the bed a and
cover and the cover is bound firmly to the bed by means of screws d. The blade
or doctor c being thus compressed in the clamp is forced to assume a corresponding
shape with the result that the outer edge of the doctor which bears against the
roller developes a helical curve of contact with the roller. The doctor thus
helically adapted to the roller does not bear upon the roller more heavily at one
point than at another and is at once by the shaping influence of the clamp caused
to assume the correct form, curve and contact throughout the entire length of the
roller. The clamp that is to say the bed a and cover b may be cast, forged, pressed
or formed in any desired method and may be formed of any suitable metal. The
clamp is set relatively to the roller at an angle corresponding to the desired helical
curve of the doctor. By means of our invention any desired amount of "slash
inclination can be given to the doctor and there is no necessity to "slash
design on the roller. The clamp may be supported in any suitable or usual manner.
For example in the drawing we apply end arms e e' to carry weights in the usual
manner and from the soles of the said arms there project pivots which slide in
bearings, the clamp and doctor being reciprocated during working in the ordinary
manner by a connecting rod which engages with a stud y projecting from the
back of the clamp as shown. It will however be understood that the method or
methods of mounting and reciprocating the clamp is or are no part of our invention
and may be varied in any desired manner.
"
ог
the
Instead of shaping the straight flexible doctor blade to the desired helical form

page_text: by means of the shears or clamp as described we might shape, cut, press or hammer
the doctor blade itself to the required form and secure it after shaping to shears or
in a clamp or to any other suitable supporting body.
"
Our invention is applicable to all purposes which necessitate the use of a "doctor
and more especially when such "doctor" requires to be set at an angle relatively to
the axis of the roller.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
23
to a helical
1. In doctors" for use in conjunction with printing or other rollers bending,
hammering or otherwise setting shaping or forming such "doctors
curve or shape for the purposes and substantially as described and shown.
2. As means for bending and forming a "doctor" to a helical curve or shape a
clamping device such for example as the bed a and cover 6 the gripping or clamping
face or surface of faces or surfaces of which is or are so formed as to impart a
helical curve or shape to a thin flexible "doctor" blade gripped in the said clamping
device for the purposes and substantially as described and illustrated.
3. The combination of the gripping clamp or shears ab shaped and curved as
described with the "doctor" blade c curved to the requisite helical form by being
gripped in the said clamp or shears substantially as described and as shown in the
drawings.
Dated UITIS
day of.
1831.
DUTTON & FULTON,
1, St. James' Square, Manchester, Agents.
DUTTON & FULTON,
1, St. James' Square, Manchester, Agents.