US1880455A

US1880455A - Doctor for calendering machines

Info

Publication number: US1880455A
Application number: US485244A
Authority: US
Inventors: Mason Herbert Warren
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-09-29
Filing date: 1930-09-29
Publication date: 1932-10-04
Anticipated expiration: 1949-10-04

Description

Oct. 4, 1932. H. w. MASON DOCTOR FOR CALENDERING MACHINES Filed Sept. 29, 1930 2 sheets-sheet 1 Elven/1'02:

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Oct. 4, 1932. H. w. MASON 1,880,455

DOCTOR FOR CALENDERING MACHINES Filed Sept. 29, 1930 2 sheetss heet 2 s W A 0 T 1:

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Patented Oct. 4, 1932 PATENT OFFICE .HERBER'I. WARREN .MASON, OF WILMINGTON, DELAWARE DOCTOR FOR CALENDERING MACHINES Application filed September 29, 1930. Serial No. 485,244.

The inventionirel-ates to paper making machinery and more particularly to calenders of the vertical roll stack type where there are a series of doctors.

The object and reason for this invention is to provide a simple, cheaper, and more easilyoperated and adjusted device for guiding paperthrough the calender rolls and for cleansing the rolls without damaging them.

One ofthe features of the invention is the provision. of adjustable doctor means readily applicable to an existing housing or frame where there have been aprevious set of doctors of an unsatisfactory'type. The entire adjustable doctor mechanism is so simple of construction'that any machine shop with the material on hand can readily construct the complete set and install same in a calendering machine with their usual toolsand me chanical force.

Another feature is the provision of means for adjusting the cleaning doctor horizontally and vertically into desired engagement with the individual calendaring rolls and the ease of adjustment, simplicity and efficiency of the tension catch.

The ease of operation, manufacture and in.- stallation and adjustment can m-oreread ily be comprehended by referring to the following description in connection with the accompanying drawings.

- Figure 1 isa-sectionalside elevation of the calender stack showing the doctors in their contacting position with their individual rolls. At the left the :entiredoctor supporting system is shown mounted on the housing or calender frame and supporting each and all of the doctors on one side of the stack, whereas the doctors areshown unsupported and diagrannnaticany but in their engaged position with the rollsat therig'htzof this-figure.

is an emerged "partly sectional view of the doctor Iblade mounting which is shown in front elevation in Fig. 3. v

Fig. 2a is a detail of the doctor trunnion. bearing.

Fig. "3is-a plan view of the doctor bladeand support.

Fig. i is a partial plan view o'fzthe construction of Fig. 2.

Fig. 5 is an elevation on line A-Aof Fig. 2, showing the doctor arm G and the adjustable catch M.

Fig. 6 shows a Vertical section through the assembled mounting on line BB of Fig. 2.

Fig. 7 is a horizontal section of the mount clamp.

To facilitate the comprehension of "the drawings let it be said that-Z represents a calender stack housing or frame containing a stack of rolls X. The following nomenclature will then pertain to this invention.

A. Doctor blade. B. Doctor angle. C. Doctor blade retainer. D. Doctor trunnion. G. Doctor arm. H. Doctor arm pivot. J. Adjustable mount. J1. Bearing for doctor trunnion.

pins). J2. Upper adjustable pin. J3. Screw for adjustable pin. K. "Catch clamp. L. Catchcla-mp bolt. M. Adjustable catch bracket. M1. Adjustable catch ordetent. N. Adjustable mount clamp assembly.

(a) Mount slide. .(b) Vertical adjustment clam-p.

(0) Vertical adjustment clamp bolt. (d) Mount retainer. 6) Mount retainer bolt. 5;) Mount lock set screw.

9) Mount guide. (71,) Mount guide 0. Support. P. Support bolt. Pl. Support bolt nuts.

(Lower bolt (rivet) Referring to the sectional view, Fig. '6,

the support 0 is mounted on the frame .or housing Z by means of the support bolt P (which may be either a turned bolt with a shoulderat each end, or a threaded rod passing through a short section of pipe) and two nuts P-l which fasten the support bolt in the housing and secure the sup-port 0 thereby to the housing.

I The support 0 consists of a flat barof structural steel, the length of which'is governed by the height of the calender stack. This support contains holes to receive support bolts P at convenient intervals through out its length and if there should be any interference with the adjustable mount clamp assembly N the support bolt P is relocated in the field by drilling two holes, one in the support 0 and one opposite in the housing Z.

Now referring to Figs. 2 and 3, a thin metallic web doctor blade A is securely but yieldably and'flexibly fastened to the doctor angle B by means of blade retainers C.

Blade retainers C are yieldably held on doctor angle B by spring clamps R. The spring clamps are mounted on the angle B and comprise hooked lugs B1 receiving leaf springs R the ends of which bear upon the surface of the blade retainers. The blade retainers can swing slightly in either direction about longitudinal axes against the act-ion of the yieldable springs B.

Each blade retainer comprises a stri of metal having a blade receiving groove at one edge thereof, and a rod T spring pressed to normally close the mouth of the groove and to bear upon the blade when it is inserted in the groove. Springs U are provided fixed to the retainer C and bearing down upon the rod T to urge it into engagement with the extended portion of the retainer C.

Hooked bracket members V are preferably provided secured to the retainer and engaging the spring pressed rod to hold it against displacement laterally while permitting limited movement against the action of springs U.

The grooved blade retainer C may be made in one piece but preferably comprises fiat strip C-l to which is secured superposed strips (1-2 and 0-3 by rivets or screws (1- 1.

A structure is thus provided whereby the blade may be manuallv inserted and re moved from the retainer by a simple movement, one end of the blade being pushed between the spring pressed rod and strip and into the groove S and the whole edge of the blade then readily follows. The blade is then secure in its retainer, while readily removable and slightly flexible or yieldable in the retainer when pressed against the roll, and the retainer itself is yieldably mounted on the angle B. i

The doctor trunnion E, shown in Figs. 2 and 3, is designed to fit the doctor trunnion bearing J -1 and is securely fastened to the doctor angle B by means of screws or rivets F. The doctor angle B is also equipped with a doctor arm @r which is held in position free to rotate about the doctor arm pivot screw H secured in a tapped hole in the doctor trunnion E.

The adjustable mount J supports the adjustable catch M by means of the catch clamp K secured by the catch clamp bolts L. This nast est adjustable mount J, by releasing the mount lock set screw f shown in Figs. 2 and 6, is free to slide in a horizontal direction either toward or away from the roll X and is entirely supported by the adjustable mount clamp assembly N shown in section in Fig. 7 It is seen by referring to Figs. 2 and 6 that this adjustable mount clamp assembly consists of a mount guide 9 riveted by means of mount guide rivets h to the mount retainer (Z. The mount retainer (Z is equipped with a mount lock set screw 7 and in turn is secured to the mount slide a. The mount slide a has two holes through which the vertical adjustment clamp bolts 0 pass and engage their threads in threaded holes in the vertical adjustment clamp Z). By loosening the vertical adjustment clamp bolts 0 it is seen that the entire adjustable mount clamp assembly N together with the adjustable mount J and consequently the entire doctor, are free to be moved vertically up or down the support 0. This mount J and its clamp assembly N when in the desired position is secured by simply tightening the vertical adjustment clamp bolts 0 and the adjustable mount J becomes fixed in a vertical position but is free to move horizontally.

When the proper horizontal adjustment is attained the adjustable mount J is fastened by tightening the mount lock set screw f, and thus the doctor blade and its supporting structure is supported by the doctor trunnion E in a fixed position horizontally and vertically but remains free to rotate about this trunnion in the bearing J -1 for the doctor trunnion in the mount J.

The bearing J -1 for the doctor trunnion comprises three pins, two of which, forming a'cradle, are fixed. in mount J and the third or upper pin J -2 being adjustably clamped to themount J by means of screws J -3. The upper pin J 2 is provided with a depending forked portion whereby it may receive the screw J -3 and be adjusted relative to the mount when the screw is loosened. The bearing J -1 is thus capable of receiving doctor trunnions E of difierent sizes.

In inserting or removing a doctor unit comprising blade, retainer, angle, and trunnion, the pins J -2 are simply loosened and removed or swung sideways to permit the doctor unit to be dropped into place or removed with great ease.

Now the catch clamp bolts L having been loosened, the doctor arm G is swung about the doctor arm pivot H until it is engaged beneath the adjustable catch or detent M of bracket M-l.

The adjustable catch bracket M-l is-then moved towards the catch clamp K until the proper tension is imparted to the doctor blade A contacting with the roll X, at which point the adjustable catch bracket M-l is firmly locked by tightening the catch clamp bolts L.

its

It is seen that by-exerting a slight pressure on the doctorarm G and rotating or swinging it about the doctor arm-pivot H; the

, arm G becomes disengaged from the adjustable catch M and the entire doctor is free to rotate about the doctor trunnion and the previous adjustment is immediately obtained byreversing the operation and again engaging the doctor arm G beneath the adjustable catch M; or that a tighter adjustment may be obtained by loosening the catch clamp bolts L and further advancing the ad justable catch bracket hi toward the catch clamp K and againtightening the bolts L. The catch or detent M is pivotal-1y mounted tothe bracket M as shown at W. p The catch has a shoulder Y to receive the arm G which may be provided with a locking stud m.

The catch M extends beyond the bracket M and its end is secured to an operating member or cable 8 which connects all of the catchesM of the successive mounts together sothatthey are operatedin unison by the cable. g After the arm G is swung beneath the catch hi which may exert initial tension on the blade inengagement with the roll, depending on the position of bracket M the tension may be further regulated (increased or decreased) according to the positions in which the cable is retained.

The individual doctors while individually releasable and regulated as to tension by bracket M areal-so operable in unison by chain or cable '8 to further adjust tension or to-release the doctors from the catches. The doctor arm may be under initial tension upon being swung beneath the detent with the cable elev-atedyso that release could not be accomplished by the cab-lealone but after operation of the cable torelease the doctor arms as far as possible, the doctor arms must be individually pushed down to release them from the catch. This is a matter of adjustnient of the catch bracket in the mount which of course could be adjusted so that there would be no initial tension upon swinging the doctor arm beneath the de'tentand all the tension would be applied by the cable which when released would also rel-case the doctor arms.

It ispr'eferred to adjust the catch bracket so that the latched doctor arms are under tension initially, supplementary tension being applied by means of the cables.

cables is urged upwardly by sprirug' '6 'se-' cured to the frameand is retained in adjusted depressed position by a suitable latoh means such as toothed quadrant and. dog means shown'at v in connection with cable operatingmember 'w.

A similar cable (not shown) is used in connection with the opposite set of doctors which are indicated only diagrammatically "BE in Fig. 1 "by the location of their trunnions.

The cables are preferably located at the same-end of the machine.

Only the upper and lower doctors of' the left hand set in Fig.1 are shown, as the r emaining doctors are of substantially the same construction and dimensions, all of the doctor arms being connected to and operable by the cable 8.

Inthe event of the doctor blade A'beco'ming'worn out the doctor is disengaged by releasing'thedoctor arm G from the adjust able catch M and the doctor assembly is rotated about the doctor trunnion E-untilthe doctor blade is readily accessible. The doctor blade A is then removed by simply pulls ing it out and a new one is simply inserted. The renewed doctor is then ready for service. Should any "further adjustment be required in either a vertical or horizontal di rectionsuch adjustment may quickly be obtained as before'des'cribed.

With this form of doctor on narrow trim machines it will only be necessary to have the doctor arm G and its associated parts at one end of thedoctor but where as oh wider machines, the doctor angle B cannot transmit suiiicient'torque to properly engage the doctor blade A with its co-acting roll X at the far end of the doctor, two arms may be installed, one at each end.

I claim I 1. A doctor mounting for calenderingzmachines including a support adjacent theirolls, a doctor blade adapted to engage 'a roll, a blade carrying member pivotally mounted in said support for swinging said blade toward or away from said roll, said blade carrying member comprising an angle bar and a blade retainer bar, and spring clamps yieldably lfiolding said blade retainer bar t'o'said angle '2. A doctor mounting'according to claiml in which said spring clamps comprise hooked lugs on the angle bar, leaf springsbeneath said hooked lugs, the ends of said leaf springs bearin upon the surface of the blade retainer ar. 7

3. A doctor mounting according to claim 1 in which said blade retainer bar comprises a 'strip' of metal having a blade receiving groove at one edge thereof and a rod mounted adjacent the mouth of the groove, springs fixed to the retainer bar and engaging-said rod to urge it into position to normally close the mouth of the groove and to bear upon the blade when it is inserted in the groove.

4. A doctor mounting according to claim 1 in which said blade retainer bar has a blade recelving surface at the outer side thereof,

spring means fixed to the retainer bar and overlying said blade receiving surface,and a rod beneath said spring means and yieldably pressed thereby into engagement with said blade receiving surface.

5. .A doctor mountingaccording to claim 1 in which said blade retainer bar comprises a base strip of metal, to which is secured a pair of superposed strips, said superposed strips forming a blade receiving groove with said base strip, said base strip being extended beyond the mouth of the groove, a rod extending along the mouth of the groove brackets loosely engaging said rod to hold it adjacent the mouth of the groove, springs on said superposed strips engaging said rod and yieldably holding it against the extended portion of the base strip to provide a spring clamp for the blade.

6. A doctor mounting for calendering machines including a support adjacent the rolls, a clamp adjustable along said support, a mount adjustable in said clamps transversely of the support and toward or away from a roll, a blade carrying member pivotally mounted in said support for swinging the blade toward or away from the roll, said doctor blade carrying member having trunnions at its ends, bearings for the trunnions, each including three pins, two of said pins being fixed in said mount and forming a cradle for said trunnion, and a third pin adjustably and removably mounted above the other two.

7. A doctor mounting according to claim 6 in which said third pin is provided with a slotted bracket portion, a screw in said mount, said slotted bracket portion being adapted to be adjustably clamped to said mount by said screw.

8. In a calendering machine, and in combination, a roll, a support disposed alongside the roll and extending at right angles to the axis of the roll, a clamp adjustable along said support, a mount adjustable in said clamp transversely of the support and toward or away from said roll, a. doctor blade adapted to engage said roll, a blade carrying member pivotally mounted in said support for sw1nging said blade toward or away from said roll, an adjustable detent on said mount and an arm pivoted to said pivoted blade carrying member and adapted to be swung into position beneath said detent to position the blade in engagement with said roll under tension determined by the adjustment of said detent.

9. Apparatus according to claim Sin which the axis of the pivotal connectionof said arm to the blade carrying member is substantially transverse to the axis of the pivotal connection of the blade carrying member of said mount. 1

10. Apparatus according to claim 8 in which said adjustable detent comprises a bar member having an overturned end and movably supported on said mount by means of a clampbar secured to said mount by clamp bolts or the like.

11. Apparatus according to claim 8 in which said adjustable detent includes a deassess;

tent bracket on said mount, a detent member pivoted to the bracket and adapted to be swung up or down, a cable connected to the free end of said detent member for moving it up or down to adjust the tension on said arm and blade.

12. Apparatus according to claim 8 in which there is a stack of rolls, and a plurality of doctor blades and mountings, there being a doctor blade andmounting for each roll, each of said adjustable detents including a detent bracket on said mount, a detent member pivoted to the bracket and adapted to be swung up or down, a cable connected in common to the free ends of all of said detent members to move them up or down in unison to adjust the tension on said blades in unison, means for retaining said cable in adjusted positions, and spring means urging said cable to relieve the tension.

13. Apparatus according to claim 8 in which said adjustable detent comprises a bar member having an overturned end and movably supported on said mount by means of a clamp bar secured to said mount by clamp bolts or the like, said detent bracket being movably supported on said mount by means of a clamp bar secured to said mount by clamp bolts or the like whereby the blades are independently adjustable as to tension, adjustable in unison by said cable, and independently releasable from said detents.

h. In combination in a calendering machine, a vertical stack of rolls a vertical support beside said stack, and a doctor blade assembly for each roll including a clamp adjustable vertically along said support, a mount adjustable horizontallyin said clamp transversely'of the support and toward or away from said roll, a doctor blade, a blade carrying member pivotally mounted in said mount for swinging said'blade about a horizontal axis into. engagement with said roll, an adjustable detent movable on said mount to determine the pivotal position of said blade carrying member, and an arm pivoted to said pivoted blade carrying member and adapted to be swung into position beneath said detent to position the blade in engagement with said roll under a tension determined by the adjusted position of said detent.

'15. Apparatus according to claim 14 in which the axis of said pivotal connection of the arm to the blade carrying member is substantially at right angles to the axis of the pivotal connection of the blade-carrying member to the mount, said adjustable mount clamp including portions engaging opposite sides'of said support with clamp bolts extending therebetween, said mount clamp proprising a bar member having an overturned upper end and movably supported on said mount by means of a clamp bar secured to said mount by clamp bolts or the like, said blade carrying member comprising an angle iron having secured thereto a trunnion for pivotal engagement in said mount, and said blade being removably mounted in said carrying member by means of a blade retainer and springs.

In testimony whereof, I afiix my signature.

HERBERT WVARREN MASON.