US3267508A - Blast brush cleaner - Google Patents

Description

Aug. 23, 1966 E. T. BRYAND 3,267,508

BLAST BRUSH CLEANER Filed March 4, 1964 INVENTOR. EDWARD T- BRYAND F BY piaqqm v-P ATTORNEYS United States Patent 3,267,508 BLAST BRUSH CLEANER Edward T. Bryand, South Portland, Maine, assignor to fietal-Tech, Inc, Biddeford, Maine, a corporation of .arne

Filed Mar. 4, 1964, Ser. No. 349,352 2 (Zlaims. (Cl. 3tl6) This invention relates to air cleaners especially for removing cutter dust from webs, or sheets, of dry paper during the paper manufacturing process.

It has long been known to provide elongated suction boxes, under the wire of a paper making machine, for extracting 'water from the pulp. It has also long been known to provide vacuum cleaner and commercial dust collection systems for removing dry dust from rugs, from machines and from other articles or locations.

However, in the paper making art, it has been found that conventional suction devices are somewhat inetficient in removing dry dust from dry paper, for example, the cutter dust created when a web of paper is cut into sheets by a rotating cutter knife.

In this invention, positive air pressure and negative air pressure are combined in the same unit. Thus, not only is the loose, dry cutter dust sucked into the vacuum box but also, jets of air under high pressure impinge on the material to dislodge and detach all dust for entrance into the suction apertures of the unit.

The principal object of the invention is to provide a dust cleaner, or blast brush, having an apertured, lower wall capable of satisfactorily removing dry dust generated by a rotating cutter in cutting a web of paper into individual sheets, while said sheets are individually and successively carried thereby on a suction roll.

Another object of the invention is to provide a positive dust removal unit for treating one face of a plurality of individual paper sheets while the opposite face is being treated by, and is suction supported on a suction roll, the unit being under the rotary cutter and removing slitter and cutter debris from the edges of the cut web.

A further object of the invention is to provide a suction box with a flat lower wall having a pair of parallel rows of suction apertures and a central row of air pressure jet orifices, the dust and debris dislodged by the jets being caught up in the suction streams on each opposite side thereof.

Other objects and advantages of the invention will be apparent from the claims, the description of the drawing and from the drawing in which:

FIG. 1 is a side view, in section, on line 1-1 of FIG. 3, of a blast brush constructed in accordance with the invention mounted opposite a web carrying roll;

FIG. 2 is an end view in section, on line 22 of FIG. 1, of the device shown in FIG. 1, and

FIG. 3 is a plan view in section, on line 3-3 of FIG. 2, of the device shown in FIGURES l and 2.

As shown in FIG. 1, the blast brush of the invention is mounted under a conventional rotary knife drum 21 having a series of fly knives such as 22 cooperating with a bed knife 23 to cut a web of dry, thin paper 24, or other sheet-like material into individual sheets 25. A suitable guide 27 directs each cut sheet into tangential contact on the surface 28 of a cylindrical roll 29, the surface 28 travelling in the same direction as the sheets and forming part of the predetermined path of advance of the sheets. A doctor blade 31 strips each successive individual sheet from the surface 28 and guides the sheets into the nip 32 of upper and lower conveyor, or carrier belts 33 and 34.

Roll 29 is a suction roll having a perforated, or apertured, surface 28 and a suction mechanism 35 within the Patented August 23, 19%6 roll so that the lower face 36 of each sheet, advancing individually and successively on the curved path defined by the curved surface 28 of the roll is subjected to suction for removing dust while also being adhered to the surface 28 for firm control of the sheets 25. In conventional suction roll systems of this type, the slitter and cutter debris located along the leading cut edge 37, the trailing cut edge 38 and the upper face 39 of each sheet 25 is often not removed .and its presence tends to reduce the commercial acceptance of the product.

The blast brush, or cleaner, 29 of the invention comprises suction means 41 including the hollow, fluid tight suction box 42, a pair of suction conduits 43 and 44 each connecting the interior 45 of box 42 to a source of suction, or negative air pressure, such as mill suction or a mot-or powered air exhauster of any well known type indicated generally at 46.

The suction box 42 includes a flat, apertured lower wall 40 provided with a treatment face 47, in a plane generally parallel to the plane of the path of the sheets 25, but at a spaced distance above the path of the upper surface 39 of the sheets. A pair of brackets 48 and 49 are fixed to the ends of the box 42, each having a vertical slot such as 51 therein for bolts such as 52 threaded in the frame 53. The box 42 may thus be moved toward and away from the path of the sheets to adjust the treatment face 47 at the desired distance from the sheet path.

The suction box 42, and the treatment face 47, extend transversely of the path of the sheets and the treatment face 47 is provided with at least one row 54 of suction apertures 55 extending axially of the face 47 and transversely of the sheet path. Preferably a second row 56, of apertures 57 is provided, the rows 54 and 56 each extending longitudinally along the outside of face 47 to define a central, longitudinally extending face portion 58 therebetween. The suction apertures 55 and 57 are in the form of continuous, or interrupted, elongated slots adapted to pass debris, dust or other foreign material into the interior 45 of box 42 for removal to exhauster 46.

The air blast means 61 includes a fluid tight, hollow plenum 62 preferably mounted within the interior 45 of the suction box 42 to form a separate compartment having an upper wall 63, side walls 64 and 65 and a lower wall 66. The plenum 62 is of smaller cross sectional area than that of the box 42 to enable dust to be extracted from the sheets, through the rows 54 and 56 of apertures around the plenum and out through the suction conduits 43 and 44.

The plenum 62 is mounted parallel to the longitudinal center line of box 42 and a row 67 of air jet orifices 68 is drilled through, or otherwise formed in, the central portion 58 of the treatment face 47 of the lower wall 40 and in the bottom wall 66 of the plenum. Thus the row 67 of orifices 68 extends parallel to the rows 54 and 56 of suction slots, intermediate thereof to dislodge dust and debris for collection in the suction apertures. A pair of air conduits 71 and 72, each at an opposite end of plenum 62, and each passing through a wall 73 of the box 42 at a reduced end 74 or 75 thereof, connect the interior 76 of the plenum to a source of air under positive pressure such as the mill air supply or a motor operated blower of any well known type indicated generally at 77. The orifices 68 are circular in outline, of relatively small diameter, for example of an inch and are closely spaced apart, for example inch, although the spacing and diameter may be increased or decreased depending on the width of the web, or sheets, of paper. The suction slots may be about .032 inch in width although this dimension is also governed by the width of the web and may be greater or less depending on the application.

I claim:

1. A blast brush, for removing dust from dry, thin sheet-like material advancing individually and successively along a predetermined path, said brush comprising:

a fluid tight, elongated hollow suction box having a fiat lower wall with a treatment face extending generally parallel to the path of said material and having means for connecting the interior of said box to a source of suction;

at least two rows of spaced suction apertures in said wall extending axially of said box and transversely of the path of said material, each said row being on an opposite side of a central axially extending portion of said face'for collecting dust from said material into said suction box;

at least one row of air blast orifices in said wall extending axially of said box and transversely of the path of said material in the said central, axially extending portion of said face between said rows of suction apertures; I

a fluid tight plenum centrally mounted within said box and connected to said roW of air blast orifices;

and means on said box for connecting said plenum to a source of air under positive pressure for blowing air through said air blast orifices in said wall against said material to separate dust therefrom.

2. A cleaner for removing dust from material advancing along a predetermined path, said cleaner comprising: suction means, including an elongated suction box having a fiat lower wall with a treatment face extending transversely of said path at a spaced distance therefrom, said wall having a pair of parallel, longitudinally extending, rows of suction apertures, each on an opposite side of a longitudinally extending central portion of said face, for extracting dust from said material;

air blast means, including at least one longitudinally extending row of air blast orifices, in said central portion of said treatment face, in parallelism with said rows of suction apertures and a plenum within said suction box, connecting said orifices to a source of positive air pressure, and

a suction roll mounted to rotate opposite said treatment face, said roll having a suction surface travelling along said path and supporting the lower face of said material while the upper face thereof is subjected to said air blast means and said suction means.

References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS Great Britain,

WALTER A, SCHEEL, Primary Examiner.

Claims (1)

1. A BLAST BRUSH, FOR REMOVING DUST FROM DRY, THIN SHEET-LIKE MATERIAL ADVANCING INDIVIDUALLY AND SUCCESSIVELY ALONG A PREDETERMINED PATH, SAID BRUSH COMPRISING: A FLUID TIGHT, ELONGATED HOLLOW SUCTION BOX HAVING A FLAT LOWER WALL WITH A TREATMENT FACE EXTENDING GENERALLY PARALLEL TO THE PATH OF SAID MATERIAL AND HAVING MEANS FOR CONNECTING THE INTERIOR OF SAID BOX TO A SOURCE OF SUCTION; AT LEAST TWO ROWS OF SPACED SUCTION APERTURES IN SAID WALL EXTENDING AXIALLY OF SAID BOX AND TRANSVERSELY OF THE PATH OF SAID MATERIAL, EACH SAID ROW BEING ON AN OPPOSITE SIDE OF A CENTRAL AXIALLY EXTENDING PORTION OF SAID FACE FOR COLLECTING DUST FROM SAID MATERIAL INTO SAID SUCTION BOX;

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