US2338465A - Suction roll - Google Patents

Description

E. T. STREET sUoTIoN ROLL Jan. 4, 1944.

, 1938 2 SheetS-Sheet l Original Filed May 19 Jan. 4, 1944. E. T. STREET SUCTION ROLL Original Filed May 19, 1958 2 Sheets-Sheet 2 Patented Jan. '4, 1944 sUc'rroN ROLL h Edwaratr. street, nowningtowmgra., asignor to Downlngto wn Manufacturing Company,

Downinztown, Pa., a corporation of Pennsylvania Original application May 19, 1938, Serial No.

208,887. Divided and this application Jun 9, 1939, Serial No. 278,335

(cl. 92-53) I 4 Claims.

This invention relates to suction rolls and, more particularly, to a suction roll especially adapted for use as a suction couch for the cylinder molds of board machinesand is a. division of my copending application Serial No. 208,887, led May 19, 1938, for Suction couch for cylinder molds. l i.

An important object of the invention is to provide a lsuction roll having a vsuction box so constructed that the suction in the roll may act to actually lift the water drawn from the paper web or felt with which the suction roll is engaged through a considerable distance and at a high vertical angle.

Another object of the invention is the provision of a suction roll having a suction box the,eiec tive width of which may be altered during operation of the roll.

Another object of the invention is the provision of a suction roll having primary andsecondary through springs 38 mounted on supports 39- car- 'l5 40 which slidably engages the plate and which has l a deckle 4I engaging the inner wall of the shell.

suction boxes in which the suction exerted in the secondary suction box may be controlled.

These and other-objects I attain by the nstruction shown in the yaccompanying drawings wherein, for the purpose 'of illustration, 'I have shown v'a preferred embodiment of my invention and wherein: f

Fig. 1 is a longitudinal sectional view through a suction roll constructed in accordance with my invention;

Fig. 2 is a section on line 2-2 of Fig. 1;

Fig. 3 is a section on line 3-3 of Fig. 2; and

Fig. 4 is a section on line 4--4 of Figf2,

The suction roll I5 is of relatively light construction, being preferablyA about 18 inches in diameter, and has the usual drilled shell I1 which is preferably provided with a correspondingly drilled rubber facing I8. This roll is mounted in suitable journals I9 supported by the arms I4, of which there is, of course, one at each end or the roll, and has arranged therein a suction box 20 held in rotatably adjusted positions through'set screws 2|. i

The suction box has a suction chamber 2 which is disposed centrally of the shell and preferably in alignment with the tubular extensions and has a mouth 28 defining a primary section area P controlled by side deckles 29 and end deckles 30 the latter being adjustable through rotatably threaded shafts.3l extending through packing boxes 32 in the fittings 23. The mouth 28 of the suction box is connected with the chamber 21 by inwardly converging Walls 33 so that the suction effort exerted in chamber 21 will cause a, constantly increasing velocity in the throat 34 of the box and thus prevent moisture contained in the air drawn through the openings of the shell from dropping back upon the surface of theshell. l

Slightly spaced from the rear face of the trailing wall 33 of the main suction box is an abl breviated radial wall 35 extending outwardly from the wall 36 of the suction chamber. ivoted to the outer end of thewall 35 is an arcuate plate 31 the curvature -ofwhich is substantially concentric with the axis of the suction chamber and .with the wall of the shell. This plate is constantly urged toward the inner wall of the shell ried by the suction chamber andbetween the plate and the shell is arranged a deckle carrier The deckle carrier may be adjusted circumferentially of the shell `and to this end I provide a plurality of cams 42 at present shown as mounted on a common rod 43 operated by a rod 44 extending through the suction chamber and having 'an angular end '45 projecting through a slot in the wall 36 and provided at the outer surface of this wall with a sealing means 46 for the'slot.

Rod 44 may be adjusted in any suitable manner, as by means of a threaded hand nut 41.A The cams 42 have slots 48 receiving arms 49 carried by one end of bell crank levers 50 pivotally mounted upon supports 5I extending outwardly from the suction box. The opposite ends of the bell crank levers are linked to the deckle carrier 40 as at 52.

It will be seen that this deckle carriertogether with the trailing Wall 33 of the primary suction area deiines a secondary suction area, and this suction area may be evacuated from any suitable source. At present I have disclosed openings 53 in the Wall 36 communicating with this suction area and controlled by valves 54 which are, in turn, controlled by a longitudinally extending rod 55 leading out from the end, of the suction chamber. Through these valves the extent of the suction created in the secondary varea may be determined.

Since the construction illustrated is obviously capable of considerable modiiication without departing from the spirit of my invention, I do not wish to be understood as limiting myself thereto except as hereinafter claimed.

I claim:

1. In a suction roll and in combination with the rotating shell of the roll, a suction chamber, suction area dening means comprising a stasection, a circumferentially extending ,plate pivoted at one end to said suction chamber and abutting 'the inner face of said circumferentially.

movable wall section, and spring means for maintaining said plate in engagement with said circumferentially movable Wall.

p 2. In a suction roll and in combination with the rotating shell of the roll, a suction chamber, suction area defining means comprising a stationary wall,` a circumferentially shiftable wall section, a circumferentially extending plate pvoted at one end to said suction chamber and abutting the inner face' of said circumferentially movable wall section, spring means for maintaining said yplate in engagement with saicl circumferentially movable Wall, and means operableiduring rotation of the shell for circumferentially shifting said wall.

3. In a suction roll and in combination with the rotating shell of the roll, a suction chamber, suction area dening means comprising a stationary Wall, a circumferentially shiftable wall section, a circumferentially extending plate pivoted at one end to said suction chamber. and abutting the inner face of said circumferentially movable wall section, and spring means for maintaining said plate in engagement with said circumferentially movable wall, said stationary Wall having valve controlled openings placing the space between said walls in communication with the suction chamber.

4. In a suction roll and in combinationywith the rotating shell of the roll, a suction chamber, suction area defining means comprising a stationary Wall, a circumferentially shitable wall section, a circumferentially extending plate pivoted at one end to said suction chamber and abutting the inner face of said circumferentially movable wall section, spring means for'maintaining said plate in engagement with said circumferentially movable wall, and means operable during rotation of the shell for circumferentially shifting said Wall, said stationary wall having valve controlled openings placing the space between said Walls in communication-with the suction chamber. 1

EDWARD T. STREET.

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