IMPROVEMENTS IN APPARATUS FOR LEADING PAPER AROUND AND BETWEEN CALENDER ROLLS
Year: 1886

page_text: Cart LD.
I RICHARD SMITH of Sherbrooke, in the County of Sherbrooke, Province of Quebec,
Dominion of Canada, Machinist, do hereby declare the nature of my invention for
"IMPROVEMENTS IN APPARATUS FOR LEADING PAPER AROUND AND BETWEEN CALENDER
ROLLS" 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 "Doctors so called, particularly that class employed as
deflectors or guides to lead by means of an air current a continuously travelling
endless paper-web between and partially around a series of calender-rolls in rapid
rotation.
One feature in my invention is embodied in constructing the upper thickened
portion or back of the doctor, hollow, and perforating it lengthwise upon the inner
side, or that contiguous to the face of the rolls with which it cooperates, so that it may
deliver a continuous supply of air. A second feature is in pivoting said doctors, so
that they may be swung away independently from the face of the rolls; while a third
feature consists in the particular arrangement of uniting them by adjustable eccentrics
to an actuating lever-rod, whereby the entire series of deflectors or doctors may be
simultaneously operated to approach, contact with, and there be maintained to cooperate
with the calonder-rolls during the passage of the endless web around and between the
latter.
•
By this same mechanism a converse movement of said doctor can be effected to
remove the latter from the rolls, in case of repairs or any other existing cause, which
might require such movement.
If so desired the deflectors may be caused to approach and contact with the rolls
only during the time, when the web is being conducted through and between them
and then withdrawn ; but in practice, I find the surface of the rolls is very materially
improved by continuous contact of the deflectors or doctors thereupon.

page_text: Lastly in the spring-mounting of the supporting ends of each doctor, whereby, when
actively employed, the latter is kept in continuous contact with the periphery of a roll;
hence, if the roll rises, owing to a wad of paper, or other material passing between said
roll and the next adjacent lower one, the doctor, spring-acinated, rises with it and
prevents said obstruction from passing up and around the upper roll. Hence the wad
is compelled to advance downwards and continues its passage as is desired.
The drawings accompanying this specification represent in Figure a perspective
view of a portion of a stack of rolls, provided with defloctor-plates and actuating
mechanism embodying my improvements, while Fig. 2 is a transverse section of snid
stack looking towards the hack-side of the paper machine, of which they form a part.
Fig. 3 is a perspective view and Fig. 4 a vertical section of the device for spring-
mounting the doctors. Fig. 5 is a similar section, taken transversely on liner,
of Fig. 4 while Fig. 6 is a plan of the actuating eccentrics, their shaft and the
adjustable rods connecting them with the series of doctors; Fig. 7 is a transverse
section of a deflector-plate in an active position with a portion of two cooperating rolls.
Figs. 8 and 9 represent the manner of pivoting and uniting the doctors to the air-
supply pipe. Fig. 10 is a front elevation of the adjusting journals of the doctor P
and Fig. 11 section on line y y of Fig. 10; Figs. 12 and 18 are respectively a front
elevation and sectional elevation of the front journal of the doctor P¹ hereinafter
described.
In said drawings A. A represent the front and rear standards or housings, which
support a series of calender-rolls B B B B³, forming part of a paper making machine.
Said rolls are to be suitably operated and are intended to receive a continuously
travelling endless weh between and partially around them in the process of "calendering,"
so termed.
Since my invention and the improvements embodied therein pertain and are applied
to a pneumatic system, I have disposed a tubular frame C to be supplied with a con-
tinuous current of air from some proper source. Supported by the frame and pivotally
attachod thereto at their rear extremities are the deflector-plates or doctors D D' D³,
arranged in alternating series on each side of the calender-rolls and opposite the points
of junction of the latter with each other.
The essential component parts of these doctors consist in a hollow back or rib
provided with a longitudinal bore b, to which is secured a sheet of metal c, perforated
at d d and bent to conform to the curvature of the roll, which it partially encloses.
This back is further provided with supports eel, the rear one of which terminates in a
flange, adapted to be holted to a corresponding one forming part of a sleeve F,
fitting about and movable upon the vertical portion of the tubular frame C, whereby a
swinging or pivotal movement, is secured and the doctors can be swung towards or
away from the calender-rolls, or easily removed in case of needed repairs.
The curved deflector-plates or shields I prefer to make of two kinds of metal;
employing steel for the upper portion, which is in contact with the face of the rolls,
when in active service, while the shield portion not in contact with the rolls may be
made of brass or other analogous metal.
9
The flange of the sleeve is furnished with T shaped slots to retain the heads of
the bolts and thereby permit adjustment thereon of the flanged head, which forms
part of the doctor, thus the position of the latter may be easily altered with respect to
the roll; adjustment of the flanged sleeves F F are obtained by means of split screw-
clamps it. The front supporting arme of each doctor is mounted upon a bracket G,
which correspond in number to that of the doctors employed or to the number of rolls
in the calender-stack.
Said brackets are capable of adjustment upon and are bolted to check-pieces II,
permanently attached to the inside face of the front standard A. These cheek-pieces
are likewise slotted at hand the proper position of the brackets is thereby easily and
readily obtained. Furthermore these brackets are vertically slotted at ii to receive
similarly formed projecting ribs, adapted to secure the movable gibj; between the
latter and the bracket are placed coiled springs, while to maintain the gib in

page_text: position and still to permit it vertical motion, induced by the springs, a bolt & is passed
therethrough and fits loosely in the bracket.
The outer extremity or supporting end e of the deflector-plate or doctor terminates
in a bracket which rests on the movable spring-actuated gib k; thus the action of
the latter is to maintain the doctor, with which it cooperates, normally in contact with
a roll, when the doctor is actively disposed. Removable locking pins oo are disposed
in said brackets m m and engage the arms ee. of the doctors, thus in case the latter
require to be swung away from the rolls for any purpose this movement can be easily
accomplished by removing said pins, when the doctor is free to swing.
To operate the entire series of doctors on each side of the roll-stack simultaneously
and maintain them continuously in contact with said rolls or to remove them therefrom
as circumstances may require, I have arranged and combined together the following
instrumentalities.
This mechanism consists primarily in an upright or vertical post or shaft J, which
may be secured to the front standard in any convenient position to enable the operative
to easily alter the doctors to any position required. Upon this shaft are mounted a
series of eccentrics or disks to one of which is secured an actuating lever-bar K;
these hubs above mentioned are securely fixed and adjustable upon the shaft J and are
peripherally slotted to receive and hold circumferentially disposed loose rings P', see
Fig. 4, which are furnished with radially projecting screw-threaded rods adjustably
united to right and left couplings; the latter engage with connecting rods s
secured to the doctors by the locking pins oo which fit in the bracket arms m m.
doctors thus are all united and cooperate simultaneously as an entirety and in a similar
manner, but since the shaft J is upon one side of the standard A, the connecting
rods which unite the doctors upon the opposite sides of the rolls must necessarily
be of considerable length.
The
After the paper-web has been conducted downwards between and partially around
the series of rolls composing the calender-stack, it becomes necessary to compel it to
pass out without wrapping round either of the two lowest rolls, since there is always a
tendency to that effect, generally agravated by the electricity generated by the rapid
rotation of the rolls.
To obviate this difficulty I have oppositely arranged two doctors PP₁, constructed
in the usual manner, and have adjustably mounted them, both front and rear upon the
standards A A. The journal adjustment of the doctor P is shown in Figs. 10. 11, as
composed of two circular plates, or disks 2, 8; the former or bracket portion is
provided with a lateral shoulder and thereby is firmly bolted to the standard A; upon
the plane face of this disk 2, is adjustably secured the face-plate 3 provided with an
eccentrically disposed bearing 4, which receives the journal of the doctor P; this
arrangement is duplicated both front and rear.
Adjustment of said doctor relatively to its distance from the face of the roll is
obtained by rocking the disk or bracket 2 while the disposition of said doctor
angularly therewith is obtained by means of the face-plate 3, which is slotted at 5. 5,
and moves upon bolts, playing therein and adapted to clamp it to the bracket-disk 2,
in any desired position.
The front adjustment of the upper doctor P1 is somewhat similarly produced by
means of a plate 6, affixed to the check-piece I, while a bearing disk 7, carrying the
journal 8 in which said doctor is mounted, is affixed thereto by means of the slots
9. 9, and the clamping bolts which hold said disk 7 in any desired position, this
arrangement of parts is shown in Figs. 12 and 13 of the drawings.
The rear support of this doctor P is a simple pivot upon the rear standard. In
Figs. 14 and 15 are shown modified constructions of a deflector or doctor and shield,
embodying my invention in which the shield in lieu of being made a part of the
doctors D D is pivoted independently therefrom.
Thus the doctor per se consists of a rib a, and the shield c is divided into two
portions cd; in which event the part c is pivoted independently to the standards
and secured in position by set-screws. On the other hand, the shield portion d' is

page_text: adapted to be swung pivotally to or from the rolls either vertically or horizontally as
shown in Figs. 14 and 15. When actively positioned it unites and cooperates with
the part with the same effect as if the shield portion was integral.
Fig. 16 represents in plan a series of calender-rolls to which is applied a series of
doctors of the same construction as embodied in D Fig. 14. In this drawing the
front side is shown in plan complete, while at the rear the upper part of the doctor
comprising the portion and plate á is removed.
The position of the latter when thrown back is represented by the dotted lines.
Furthermore these shields are pivoted upon and secured to the standards in the
brackets mm, while the upper portion of the doctor is pivoted at no nº. In lieu of
forming the deflector or shield portion of the doctor from an integral sheet of metal,
as a series of curved arms, or fingers may be employed instead and with equally good
results.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is :-
1st. A deflector-plate or doctor composed of a tubular back or rib to which is
secured a curved metallic plate, the latter provided longitudinally with apertures
opening into the tubular rib, whereby a flow of air may be continuously discharged,
substantially for purposes herein described.
2d. Two continuously rotating rolls, one partially enclosed by and the other in
contact with a deflector-plate or doctor in combination with said deflector-plate,
pivotally mounted and swung in horizontal paths of movement towards or away from
the rolls, for purposes herein set forth.
31. In combination with a series of continuously revolving rolls, the pivotal spring-
actuated deflector-plates oppositely and serially arranged on either side thereof, said
deflector-plates alternating at the meeting surfaces of the rolls and adapted to supply
air continuously, substantially for purposes described.
4th. In combination with a pair of revolving rolls, a pivotally mounted doctor
composed of a tubular back to which is secured a curvedi metallic plate, the latter to
contact against the upper roll and partially enclose but not touch the lower roll,
substantially as herein stated.
5th. The series of revolving rolls provided with a series of alternately oppositely
disposed pivotally arranged doctors, in combination with the actuating shaft, eccentric
ilisks and connecting rods united with the doctors, whereby simultaneous movements
of the latter are effected, substantially as herein stated.
6th. In combination with a series of continuously rotating rolls and the alternately
oppositely arranged doctors, pivotally mounted, the doctors P P secured upon the
standards and permanently impinging upon their cooperating rolls, as and for the
purposes set forth.
7th. The combination with the curved plate c, perforated as described and attached
to a tubular rib a pivotally mounted, of the sliding gib j, bracket G and actuating
rod J with its connecting mechanism, all operating substantially as described.
8th. In combination with a pair of revolving rolls adapted to receive and pass
between them a continuous paper-web, the doctors longitudinally disposed thereof,
but oppositely inclined and adjusted to rest in contact with said rolls, while in rotation,
substantially as herein stated."
9th. In combination with a pair of rolls, the deflector-plate D and the shaft J,
provided with the eccentric hubn, ring p and screw-threaded rod y, the rods adjustably
connected with the doctor by the coupling r, substantially as described.
10th. The cheek-pieces I and the bracket G, which supports one end of the doctor D,
in combination with the gib j, its.springs k k and the terminal support e of. said doctor,

page_text: whereby vertical movement thereof is obtained, substantially for purposes herein set
forth.
11th. In combination with two adjacent rolls and the doctors vertically disposed, as
to each other, but oppositely and permanently inclined against the surface of said rolls,
the adjustable disks 22 and face-plates 3. 3. slotted at 5. 5. and carrying the journals 4. 4,
all operating as herein described.
12th. The combination with two adjacent rolls, and the oppositely inclined doctors
longitudinally arranged and normally resting thereon, of the supporting plates 6. 6,
slotted disks 7. 7, and journals 8. 8, substantially as and for the purposes stated.
13th. In a standard provided with a series of revolving rolls, the combination with
the pivoted rib a and strip co secured to said standards, of the shield s likewise pivoted
thereon and movable with respect to the rolls, the whole forming a doctor, substantially
as herein stated.