US2297976A

US2297976A - Scrubbing and polishing apparatus

Info

Publication number: US2297976A
Application number: US386656A
Authority: US
Inventors: John S Nachtman
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-03-30
Filing date: 1941-04-03
Publication date: 1942-10-06
Anticipated expiration: 1959-10-06

Description

Oct. 6, 1942- J. s. NACHTMAN SCRUBBING AND POLISHING APPARATUS Original Filed March 30, 1957 6 Sheets-Sheet 1 JMW Jb/Zn AYMtfiiI/idil Oct. 6, 1942. J. s. NACHTMAN SCRUBBING AND POLISHING APPARATUS Original Filed March 30} 1937 6 Sheets-Sheet 2 gwwwm M m M N d Oct. 6, 942- J. s. NACHII'NQIAN 2,297,976

SCRUBBING AND POLISHING APPARATUS Original Filed March 30, 1937 6 Sheets-Sheet 3 Oct 1942- J.-S. NACHTMAN 2,297,976

SCRUBBING AND POLISHING APPARATUS I Original Filed March so, 1937 6 Sheets-Sheet 5 55a 77a 5 7 586 50c I) l I 2010 58 O 61c gg 3': Q6 3190 2195 59 wag Fly. 6

Oct. 6, 1942. J. s. NACHTMAN 2,297,976

SCRUBBING AND POLISHING APPARATUS Original Filed March 50, 1937 6 Sheets-Sheet 6 JMW Fly/0 Patented Oct. 6, 1942 SCRUBBING AND POLISHING APPARATUS John S. Nachtman, Youngstown, Ohio Original application March 30, 1937, Serial No. 133,911. Divided and this application April 3, 1941, Serial No. 386,656

Claims.

The invention relates to apparatus for producin metal stock coated with dissimilar metal, and particularly to scrubbing and polishing apparatus constituting a part of apparatus for con tinuously coating sheet and .the like ferrous metal stock with tin, whereby sheets, strips and the like of indefinite length may be produced continuously in finished marketable form.

This application is a division of my copending application Serial No. 133,911, filed March 30, 1937, patent No. 2,240,265, dated April 25, 1941, and entitled Method of continuously tin plating ferrous metal stock.

The method of tin plating ferrous metal stock which is disclosed in said application Serial No. 133,911 includes steps such as providing a continuous supply of stock by attaching, preferably by welding, the end of a fresh strip to the end of an exhausted strip, adjusting the feed of the strip in such a manner, preferably by means of a looping slack-producer, that continuous passage of the strip through subsequent stages of treatment in the apparatus may be continued during the period when the end of an exhausting strip is held stationary for welding to it the end of a fresh strip, cleaning the stock by passing it through appropriate cleaning and degreasifying baths of electrolytic or other appropriate forms, scrubbing the stock by brushing mechanism, rinsing and pickling the stock with subsequent scrubbing, electroplating the stock with subsequent scrubbing, rinsing and drying the stock, alloying, cleaning and burnishing the stock, and finally coiling or otherwise appropriately preparing it for removal and handling.

The apparatus disclosed in said application Serial No. 133,911 is adapted for continuously coating metal stock in strips, wires or sheets of indefinite length, and includes, means for supporting metal stock to be fed into the apparatus, means for joining the end of one piece of stock to another to produce a continuous strip, means providing for stopping the end of the strip during the joining operation, while the balance of the strip continues to move through the apparatus, means for cleaning, pickling, scrubbing, rinsing, plating, drying, alloying and burnishing the stock, and means for properly guiding and tensioning the strip during its travel and in various novel features inherent in the means referred to.

Said apparatus includes novel scrubbing and polishing apparatus for scrubbing the stock after cleaning and degreasing treatment, after rinsing and pickling, and immediately after electroplating, and also for burnishing a coated prodnot.

This application relates specifically to said novel scrubbing and polishing apparatus which, although adapted for use in continuously tin plating ferrous stock, is also adapted for scrubbing and polishing ferrous stock coated with other dissimilar metals, as well as for scrubbing and polishing non-ferrous or non-metallic stock.

Prior scrubbing and polishing apparatus has included brush rolls over which a strip or sheet is pulled, but with such apparatus the bristles of the brush rolls are subjected to undue wear and pressure and scratches and stains are formed on the surface of the strip.

In such prior apparatus the strip is pulled over rotating brush rolls in such a way that the strip the brush to bend and break with the result that the brushing action is not uniform and scratches and streaks are formed on the brushed surface.

Due to the fact that rolled steel is seldom, if ever, perfectly flat, especially when under tension, the pressure between the brush roll and the strip is uneven, which results in non-uniform brushing action, particularly when the strip vibrates.

The partial wrapping of the strip around the brush rolls forms a concave arcuate surface of the strip contacting the brush, which with the tension on the strip causes a pounding action tending to drive surface stains into the metallic surface of the strip.

According to the present invention, the strip is wrapped slightly around the surface of a solid back up roll for each brush roll, and the pressure between the brush roll and the strip is adjustable independently of the tension on the strip, so that no radial pressure is exerted on the brush roll and a relatively small convex area of the strip is brushed.

Consequently, vibration of the strip is eliminated, buckling and distortion minimized, the life of the brush rolls greatly prolonged, and a uniformly brushed surface free from scratches and stains is produced on the strip.

It is therefore an object of the present invention to provide an improved apparatus for scrubbing and polishing both surfaces of strips or sheets and the like without causing scratches or otherwise marring the surfaces thereof.

Another object is to provide an improved convex arcuate surfaces of the strip for uniformly scrubbing and polishing the strip.

Another object is to provide improved means for vertically adjusting the brush rolls toward and away from the back up rolls.

A further object is to provide brushing apparatus in which the life of the brush rolls is greatly prolonged.

A still further object is to provide improved means for axially reciprocating the brush rolls laterally of the strip while the rolls are rotating.

These and other objects are accomplished by the parts, improvements, combinations and arrangements comprising the present invention, preferred embodiments of which are shown by way of example in the accompanying drawings, and hereinafter described in detail and defined in the appended claims.

Referring to the drawings forming part hereof,

Figure l is a somewhat diagrammatic view in side elevation of a preferred form of scrubbing and polishing apparatus comprising the present invention;

Fig. 2 is an enlarged fragmentary longitudinal sectional view of the same with the rolls transposed from the position of Fig. 1;

Fig. 3 is a plan elevation thereof with parts broken away;

Fig. 4 is a side elevation thereof, partly in section as on line 4-4, Fig. 3;

Fig. 5 is a fragmentary transverse sectional view as on line 5-5, Fig. 4;

Fig. 6 is a fragmentary transverse sectional view as on line 6-6, Fig. 4;

Fig. '7 is a fragmentary plan view partly in section of a modified form of the improved scrubbing and polishing apparatus;

Fig. 8 is a side elevation thereof, partly in section as on line 8-8, Fig. '1;

Fig. 9 is a fragmentary transverse sectional view as on line 99, Fig. 8; and

Fig. 10 is a fragmentary end elevational view as on line Ill-l0, Fig. 8 with parts broken away.

Similar numerals refer to similar parts throughout the drawings.

Referring to Fig. 1, the improved scrubbing and polishing apparatus is indicated diagrammatically at G and includes reciprocating rotary brushes 44 and 44' arranged for contact with the opposite faces of the strip S, and rubber or other suitable rollers 45 and 45' arranged to back up the strip in alignment with the brushes 44 and 44'.

Means controlled by the hand wheels 46, 48' for applying appropriate pressure to the brushes 44, 44', and means power driven by a suitable motor 41 for rotating and reciprocating the brushes will hereinafter be described in detail.

Included in combination with the scrubbing mechanism G is a squeegee or pressure device 48 having preferably rubber rolls, and adapted for aligning and tensioningthe strip. As shown in Figs. 2 to 6, inclusive, a pressure device or squeegee 48' similar to or identical with the squeegee 48 may be embodied in the entrance end of the scrubbing apparatus, and the

rolls

44 and 45 are shown in interchanged position with rolls 44' and 45', which obviously has no effect on the scrubbing action.

The squeegees 48 and 48' also perform the function of controlling the film of solution on the strip entering or leaving the apparatus. If desired a drip pan 48a may be positioned under the squeegee at the entrance end for collecting squeegeed liquid and diverting it back to the previous treating apparatus.

The improved scrubbing apparatus shown in Figs. 2 to 6 inclusive, preferably includes a base I I on which laterally spaced side frame members I! are supported. Transverse frame members l3 span the side frame members at the ends thereof and are secured thereto by bolts l4.

The Squeegees 48 and 48 each preferably include a fixed lower roll l5 and a vertically movable upper roll I6, both rolls being rubber covered as shown at I5 and 16 respectively. The roll shafts ll of the lower rolls I 5 are journaled at their ends in bearings I8 which are mounted in bearing supports I9 clamped by bolts 20 to vertically extending guide rods 2i spaced longitudinally of the apparatus. The rods 2i are preferably secured at their top and bottom ends in anchor members 22 attached to the side frame members by screws 23.

The roll shafts 24 of the upper squeegee rolls l6 are journaled at their ends in bearings 25 which are mounted in bearing supports 26, and the supports 26 are vertically slidable on the guide rods 2|. Helical springs 21 eng'irdle the guide rods between the bearing supports [9 and 26 for yieldingly supporting the upper rolls l6. Means for yieldingly pressing the upper rolls l6 downwardly to grip the strip S for tensioning the same preferably includes a pressure plate 28 slidable on the guide rods 2| and abutting helical springs 29 interposed between the plate and the bearing support 26.

Means for manually adjusting the pressure plates 28 vertically to yieldingly press the upper rolls l6 downwardly preferably includes screws 30 threaded through the upper anchor members 22 and journaled at their lower ends in the pressure plates 28. Hand wheels 3| may be provided on the upper ends of the screws 30 for manually turning the same.

Each brushing roll 44 with its back up roll 45 is positioned in the apparatus at or opposite slotted openings 32 in the side frame members l2, andthe bearing supports for the rolls are preferably adjustably mounted on the side frame members at the edge portions of said openings.

The back up

rolls

45 and 45 are preferably provided with rubber coverings 45a and 45a respectively, which constitute resilient facings for the back up rolls, and the rolls are preferably hollow as shown and provided with

roll shafts

45b and 45b.

As best shown in Fig. 5 the ends of each roll shaft 45b and 45'!) are journaled in bearings 33 and the bearings 33 are mounted in bearing supports 34 The bearing supports have diverging flange portions 35 (Figs. 2 and 3) which are provided at their outer ends with vertically extending bolt slots 36 through which bolts 3! are screwed into the edge portions 38 of the openings 32 in the side frame members.

Accordingly, the back up rolls can be adjusted in the side frame members with respect to the squeegee rolls 48 and 48 so that the strip S passes in slightly arcuate paths from the squeegee rolls 48' upwardly over the back up roll 45',

then downwardly under the back up roll 45, and

then upwardly to the squeegee rolls 48.

The roll shafts 39 of the brush rolls 44 and 44' project rearwardly from the brush rolls and are preferably mounted for axial reciprocation in bearing supports 50. as best shown in Fig. 5. The bearing supports 50 preferably include a bearing sleeve journaling the end of shaft 39 for axial sliding movement therein, and washers 52 may be provided around the shaft at the inner end of the sleeve 5| for providing a water seal for the bearing. As shown an oil wick 53 may be provided for lubricating the sleeve bearing, and a removable plug 54 is provided in the casingof the support 50 for giving access to the wick.

The bearing supports 50 have screw rods 55 non-rotatably secured at their lower ends to the bearing supports 50 and having their upper ends extending into worm gear housings 56 which extend across the openings 32 in the rear side frame members l2 and are bolted to the tops thereof by bolts 51.

The roll shafts 39 have front projecting portions 58 which extend into and are supported in housings indicated generally at 59 and enclosing mechanism for rotating and reciprocating the rolls. The housings 59 are located in the openings 32 of the front side frame members I2, and are preferably provided with flange portions 60 (Fig. 4) overlapping and slidably abutting the edgeportions 38 of the side frame openings 32. The flange portions 60 are provided with vertically extending slots 6| through which bolts or screws 62 are inserted and screwed into the edge portions 38 of the front side frame member l2. Thus the housings 59 are vertically adjustable on the side frame members.

Adjusting screws 63 extend vertically upward from-the housings 59 and have their lower ends non-rotatably secured in said housings. These adjusting screws extend at their upper ends into worm gear housings 64 which extend across the tops of the openings 32 in the front side frame member l2 and are secured thereto by bolts or screws --65.

Means for manually adjusting each brush roll vertically preferably includes a horizontal worm shaft 55a extending between the side frame members and through the worm gear housing 64 and the worm gear housing 56, there being preferably a sleeve housing 66 enclosing the shaft 65a and connecting the

gear housings

64 and 56. The front ends of the shafts 65a project outwardly from the housings 64 and are provided with

hand wheels

46, 46 thereon. Within each housing 64 the worm shaft 65a is provided with a worm 68 meshing with a worm gear 69 which is keyed on a sleeve nut in which the screw 63 is threaded. Likewise, within the housing 56 the worm shaft 65a is provided with a worm II which meshes with a worm gear 12 keyed on a sleeve nut 13 in which the adjusting screw 55 is threaded.

Thus by loosening the screws 62 which clamp the housing 59 to the side frame, and then turning the hand wheels 46, 46' the brush rolls may be adjusted vertically with respect to the back up rolls. As shown in Fig. 2, the brush rolls are positioned to brush or sweep lightly over the slightly convex arcuate portions of the strip at the points where the strip passes over the back up rolls, the brush roll 44' contacting the upper convex arcuate surface of the strip at the back up roll 45' and the brush roll 44 contacting the lower convex arcuate surface of the strip at the brush roll 45.

When used for brushing or scrubbing the rolls 44, 44' may have fiber or wire bristles, when used for polishing the bristles may be replaced or covered by felt and the like, and when used for burnishing the brush rolls may be covered with metallic wool facings.

As shown in Fig. 4 the housing 59 in which brush roll 44' is journaled is at the upper limit of its adjustment on the side frame member l2,

so that the brush roll 44 can be adjusted down-' wardly as the brush bristles wear to maintain a constant line of brushing contact with the strip, and'the housing 59 in which the brush roll 44 is journaled is at the lower limit of its adjustment so that as the bristles of said brush roll wear, it can be adjusted upwardly to maintain the desired line of brushing contact with the strip.

As'shown in Figs. 2, 3, 4, 5, 7, 8 and 9, the diameters of the back up rolls in the preferred arrangement are approximately the same as the diameters of the brush rolls, when the brush rolls are new. In these figures of the drawings, the brush rolls are shown as being new and at their outer limit of adjustment relative to the back up rolls, and as the brush bristles wear, the diameters of the brush rolls become smaller, so that the diameters of the back up rolls become relatively larger with respect to the brush rolls. However, the back up rolls may be approximately three-fourths the size of the brush rolls in diameter when the brush rolls are new, as shown in Fig. 1, which corresponds to Fig. 5 of my parent application Serial No. 133,911 (Patent. No. 2,240,265), or the back-up rolls may initially be approximately two-thirds of the size of the brush rolls in diameter, as shown in Fig. 11 of said Patent No. 2,240,265.

Accordingly, the back up rolls have a diameter in the order of about two-thirds of the diameter of the brush rolls, although the exact relationship may vary due to the wear in the brush rolls. The expression that the back-up rolls have a diameter in the order of the diameter of the brush rolls as used herein and in the claims, is intended to define a back up roll and brush roll diameter relationship of the order of those illustrated and described.

Suitable means (not shown) may be provided for differentially adjusting the back up roll when the clamping bolts 31 are loosened so as t make the outer periphery of the back up roll accurately conform to the outer periphery of the bristles of the brush roll at all times, so that the line of contact of each of the back up rolls 45' and 45 with the strip S is always parallel with the line of ,contact of the brush rolls 44 and 44 respectively, with the strip.

The means for driving the brush rolls 44 and 44' preferably includes a drive shaft 15 (Fig. 4) mounted on the base II at the front side of the apparatus and operatively connected at one end with the motor 41 by means of suitable gearing l6, Theshaft15 has secured thereon a bevel gear 11 meshing with the bevel gear I8 connected to a collar I9 in which the vertical shaft is splined, and the shaft 80 drives the brush roll 44. In a similar fashion the shaft 15 has a bevel gear 8! thereon meshing with a bevel gear 82 secured to a collar 83 in which a vertical shaft 84 is splined, and the shaft 84 drives the brush roll 44'. The spline connection between the shafts 80 and 84 and the collars I9 and 83 respectively, provides a slidable driving connection which permits adjustment of the housings 59 in which the brush roll shafts are journaled.

Each of the shafts 80 and 84 has a worm gear 85 thereon which meshes with a pinion 86 secured to or integral with a driving sleeve 81 which encircles the projecting end 58 of the.

brush shaft 39. The driving sleeve 81 has a splined connection indicated at 89 with the end of shaft 39 so as to permit axial reciprocation of the shaft 39 while being driven by the sleeve 91. As shown, the sleeve 81 may be journaled in the housing 59 by suitable bearings 89, and gaskets 90 may be provided around the projecting portion 59 of the shaft at .the inner side of the housing for providing a water seal for the housing 59 adjacent to the brush roll.

The means for laterally reciprocating the brush rolls preferably includes a pinion 9I keyed on the driving sleeve 81 and meshed with a gear 92 secured on a worm shaft 93 journaled in the housing 59 below the driving sleeve 81. A worm 94 on the worm shaft 93 meshes with a Worm gear 95 journaled in bearing brackets 96 mounted on the bottom wall 91 of the housing 59. The worm gear 95 is provided with crank arms 98 to which links 99 are pivotally connected at one end, and the other ends of links 99 are pivotally connected as at I to the arms I M of a yoke straddling the end portion I02 of the shaft roll 39 and pivotally mounted on a rocker shaft I03 secured in the upper end of housing 59.

The end I02 of shaft 39 is axially slidable in a sleeve bearing I04 provided in the housing 59, and a bearing collar I05 encircles the shaft within the yoke and is provided with side projections I09 secured to the arms I0| of the yoke. The bearing collar I05 houses an anti-friction bearing for the end portion I02 of shaft 39, and the bearing collar is also provided with upper and lower projections I01 providing guide ways for guide bars I 08 secured to the front wall of the housing 59 as by screws I09.

Thus as the brush shafts 39 are rotated by the vertical shafts 80 and 84 operatively connected to the pinions 86 on the driving sleeves 91, the pinions 9| on the driving sleeves 81 will drive the worm gears 95 and oscillate the side bars IOI of the yoke, and the movement of the yoke will reciprocate the bearing collar I05 and with it the brush roll shaft 39, with the result that the brush shafts reciprocate laterally of the strip while they are rotating. The reciprocation of the brush rolls while rotating provides for imparting a uniform scrubbing action over the surface of the strip and greatly aids in eliminating scratches or other marking on the surface of the strip. a

Spray pipes I I0 are provided above and below the path of the strip S at opposite sides of each brush roll 44', 44 and the back up rolls 45' and 45 therefor, for spraying water or other cleansing fluid on the strip as it passes between the brush rolls and back up rolls.

The spray pipes IIO extend parallel to the brush rolls and back up rolls and may be connected at one end to a suitable source of liquid supply (not shown).

In the modified form of improved scrubbing and polishing apparatus shown in Figs. 7 to 10 inclusive, the frame preferably includes laterally spaced upright members lie at intervals longitudinally of the apparatus, and each member He may comprise a channel I20 and a Plate I30 secured across the legs thereof with supporting angles or feet He secured to the base.

A series of brush rolls 44'c and 440 with yertically aligned back up rolls 45'c and 450 are journaled between the frame members, each brush roll and its back up roll being located opposite the opening formed between a pair of adjacent frame members IIc back up rolls are preferably staggered with respect to the strip S passing through the apparatus, that is, alternate brush rolls and alternate back up rolls are located above and below the strip so as to uniformly scrub both surfaces thereof.

A pressure device or squeegee is preferably located at the discharge end of the apparatus and includes a fixed upper roll I50 and a vertically movable lower roll I50, both of which rolls may be rubber covered as desired.

The roll shaft I'lc of the lower roll I5c is journaled at its ends in bearings I which are supported on lever arms I9c hinged at their inner ends as at 200 on brackets 2Ic secured to the end frame members He. The lever arms Ilc are yieldingly held in position by means of rods 22c passing through their outer ends, with springs 23c interposed between the lever arms I and nuts on the rods above and below the same. At their lower ends the rods 220 are pivoted to links 240 which are in turn pivotally connected with a suitable adjusting device 25c.

The roll shaft 260 of the upper roll I00 is journaled at one end in a bearing 21c mounted on a suitable bracket 28c secured to the frame, and at its other end in a bearing 29c supported on a bracket 300 secured to the frame, the shaft 260 extending through the bearing 290 for driving connection with a suitable motor 3Ic for driving the squeegee roll I6c independently.

The roll shafts 32'c of the upper brush rolls '0 are joumaled at their ends in bearings "'0 which are carried by laterally extending arcuate shield members 34'c positioned around the upper portions of the brush rolls and projecting laterally beyond the frame members He at each side thereof. Similarly the lower brush rolls 440- have their roll shafts 32c journaled at their ends in bearings 33c which are carried by laterally extending arcuate members 34c positioned around the lower portions of the brush rolls 44c and extending laterally beyond the frame members He at opposite sides thereof.

The arcuate members '0 for the upper brush rolls 44c are supported at each end for lateral movement in vertically movable end frames 35'c which are slidably mounted in ways 36'c on the frame members He, and the arcuate members 340 for the lower brush rolls 440 are supported at each end for'lateral movement in vertically movable end frames 35c slidably mounted in ways 360 on the frame members Ho.

The roll shafts "'0 and 32c of the upper and lower brush rolls are extended at one side of the apparatus for operative connection with individual brush roll driving motors 3'I'c and 31c respectively, which motors are suitably supported on laterally extending plates 38'c and 380 secured at their inner ends to the arcuate members 34'c and 34c respectively.

Means for vertically adjusting the upper brush rolls '0 preferably includes screws 39'c screwed ,in the end frames "'0 and having worm gears The brushrolls and which straddle the roll shafts of the upper back up rolls 450.

The upper arcuate members 34'0 preferably have lugs 4'I'c projecting therefrom engaging rollers 48'c journaled at opposite sides of the end frames 35's for permitting lateral movement of the arcuate members in the end frames, and similarly, the lower arcuate members have lugs IIc projecting therefrom engaging rollers 48c journaled at oppositesides of the end frames 35c.

Preferably the roll shafts 49c and fl9'c for the upper and lower back up rolls have their ends joumaled in stationary bearings mounted on angle or channel members We extending between adjacent frame members lie, and at one side of the apparatus, the back up roll shafts are extended for operative connection with individual back up roll driving motors 5| and I'c supported on suitable brackets 52c carried on the frame members No.

Means for laterally reciprocating the brush rolls preferably includes an oscillating shaft 530 journaled in bearing brackets 540 on the frame members He and extending longitudinally of the apparatus between the brush roll shafts 32'c and 320. The shaft 53c is driven by a separate motor 550 supported on a suitable bracket 56c carried on the frame members He.

The motor 550 drives a crank having a link 51c pivoted thereto at one end and the other end of the link is pivoted to an arm 580 having its other end secured to the shaft 53c for oscillating the same. Lever arms 590 are secured on the shaft 530 and link-connected to lugs 60c depending from the upper brush roll arcuate members 340, and similar lever arms 6|c are secured on the shaft 53c and link-connected to lugs 62c projecting upwardly from the lower brush roll arcuate members 340.

Accordingly, when the shaft 530 is oscillated the upper arcuate members 340 and lower arcuate members 340 and the brush rolls carried thereby will be reciprocated laterally of the strip S, the upper brush rolls moving in one direction while the lower brush rolls are moving in the opposite directon, and vice versa, to impart a uniform scrubbing action to both surfaces of the strip..

As shown, spraypipes 630 may be provided above and below the strip adjacent to and parallel with the brush rolls and back up rolls, for spraying water or other cleansing liquid on the strip as it passes between the brush rolls and back up rolls. Preferably a closed liquid tank having sheet metal walls indicated at 640 is provided for enclosing the brush rolls and back up rolls, and said tank may have a drain 650.

In the modified form of the invention, the brush rolls can be reciprocated or not, as desired, by independently operating the motor 550 which drives the oscillating shaft 530.

Reciprocation of the brush rolls is desirable when brushing or polishing multiple strips of heavy gauge because otherwise there is a tendency to wear grooves in the face of the brush roll which requires very frequent trimming of the bristles.

On the other hand, reciprocation of the brush rolls may not be desirable where the strips are of light gauge and are brushed under low tension, because the strips would reciprocate with the brushes and there is a tendency to curl the edges and scratch the surface which is against the back up roll.

When brushing or polishing wide material at slow strip speeds, reciprocation of the brush rolls tends to cover up or prevent streaking on the strip surface which might be caused by a brush roll not in perfect trim. However, at relatively high strip speeds, the brush reciprocation will not cover up streaking but will merely ing strip material of various kinds under vary-' ing conditions, to produce a uniform surface on the strip without scratches, streaks or stains, and without causing undue wear on the bristles of the brush rolls.

I claim:

1. Scrubbing and polishing apparatus including a frame, a brush roll journaled in said frame, a back up roll joumaled in said frame in vertical alignment with'said brush roll, meansfor passing a strip between said rolls so as to present a convex arcuate surface of the strip to said brush roll, means for adjusting said brush roll toward and away from said strip, means for reciprocating said brush roll transversely of said strip, and means for rotating the reciprocable adjustable brush roll.

2. Scrubbing and polishing apparatus including means for supporting a continuously moving strip and maintaining portions thereof in slightly arcuate form, brush rolls for brushing under pressure the convex surfaces of said arcuate portionsalternately on opposite sides of the strip, and. means driven from said brush rolls for reciprocating said brush rolls transversely of saidstrip.

3. Scrubbing and polishing apparatus including means for supporting a continuously moving strip and maintaining portions thereof in slightly arcuate form, brush rolls for brushing under pressure the convex surfaces of said arcuate portions alternately on opposite sides of the strip, means for adjusting said brush rolls toward and away from said strip, means for rotating said brush rolls, means for reciprocating said brushing means transversely of said strip, and means driven by the rotating brush rolls for operating the reciprocating means.

4. Scrubbing and polishing apparatus including means for moving a continuous strip under tension through said apparatus, brush rolls arranged alternately above and below said strip, back up rolls arranged alternately above and below saidstrip in vertical alignment with said brush rolls, said back up rolls being positioned to maintain the portions of the strip passing thereover in slightly arcuate form, means for adjusting said brush rolls toward and away from said strip for brushing under pressure the convex surfaces of said arcuate portions, means for rotating said brush rolls, means for reciprocating said brush rolls transversely of said strip, and means driven by the rotating brush rolls for operating the reciprocating means.

5. Scrubbing and polishing apparatus including a frame having vertical slots therein, tensioning rolls journaled in one end of said frame paratus; brush rolls arranged alternately above and below said strip, bearing supports having housings journaling the ends of said brush rolls and adjustably mounted in said. frame slots, back up rolls journaled in the frame -.and-v arranged alternately above and below the strip in vertical alignment with said brush rolls, said back up rolls being positioned to maintain the portions of the strip passing thereover in slight-. ly arcuate form, means for adjusting said bearing support housings for moving said brush rolls toward said strip to contact the convexsurfaoes of said arcuate portions, means including ge'aring and shafts within the bearing support house ings and movable therewith at one endzof said brush rolls for rotating saidbrush rolls, and

tween said rolis'so .as to present a convex arcuate surface of the strip to said brush roll, a driving sleeve securedzon saidnbrush roll shaft, means for driving-said driving sleeve for rotating said brush :roll, and means driven by said driving sleeve for reciprocating the brush roll while the sameis rotating. 1

9; Scrubbingand polishing apparatus includinga: frame, tensioning means for moving a continuous metal strip: through said apparatus, brush-rolls :Ioumaled in the frame and arranged alternately aboveand below said strip, back up drive means fixed relative to the frame for driv-- ing the brush rolls in all positions ofaadJustment.

6. Scrubbing and polishing apparatus including a-frame having vertical slots therein tensioning rolls journaled in one end of said frame for moving a continuous strip through said-apparatus, br'usli'rolls journaled in the frame and arranged alternately above and below said strip, back-up rolls journaled in the frameand arranged alternately above and below the strip in vertical alignment with said brush rolls, --said back up rolls beingpositioned-to-maintain the portions-of -the-strip passing thereover in slight- 1y--arcuate -form,- bearingsupports havinghousings .lournaling-the ends-ofthe brush-rolls and adjustably mounted insaid frame-slots, means for adjusting said housings for moving a said brush rolls toward saidstrip to contact the convex surfacesof said arcuate portions, means for rotating each of said brush rolls,v and means driven by eachof saidbrush rolls for reciprocate ing- .the brush -rollstransversely of the strip while they are rotating, the brush roll rotating means and the reciprocating means being both mounted. and enclosed in the bearing support housings at one end of the brush rolls. v

'7. Scrubbing and-polishing apparatus including aframe, tensioning rolls journaled in one end of said frameformoving a continuous stripthrough said apparatus, brush rolls journaled in the frame andarranged alternately. above and below said strip, backup rrollsjournaled in.the frame and arranged alternately above and below said strip in vertical alignment with said brush rolls, said back up rolls being positioned to'maintain the portions of the strip passing thereover in-slightly arcuate-form, means for adjusting said brush rolls toward said strip-for contacting the convex surfaces of said arcuate portions,

means for-rotating said brush rolls, and inde-- pendent-means for rotating said back up rolls.

8. Scrubbing and polishing apparatus including aframe, -a brush roll having a shaft journaled insaid frame, a back up roll journaled in said frame in vertical alignment with said brush roll, means for passing a strip continuously berollsrhaving a diameter in the order of the dimeter of the brush rolls to permit the tensioned metal strip to conform to theback up roll surfaces without. causing permanent distortion of the metal strip,.saidback up rolls being journaled in the.;frame and located alternately above and belowasaid strip. and maintained. in verticalalignment with said brush rolls, said back up rolls having resilient facings and being positioned to maintainthe portions of the tensioned strip passing thereover backed up in slightly arcuate'form, means for adjusting said brush rolls relative to. said -strip for contacting the brush rolls *with the tensioned convex surfaces of said arcuate portions and-,for maintaining the desired pressure between the brush rolls-and the backed up arcuatastripportions independently of the tension on the strip,-means forrotating said brush rolls, andmeans for spraying liquidon the tensioned moving strip as it passes between the brush rolls and back up rolls..

10. Scrubbing and polishing apparatus including a frame, cylindrical back up rolls.journaled in the frame for guiding a continuous metal strip,.means for moving said continuous strip under tension in a sinuous path alternately under one and over another of said back up rolls to causeeach portion of the strip to conform with the shape of each back up roll momentarily and to present a tensioned convex arcuate surface, said .back up rolls having a diameter in the order ofthe diameter of the brush rolls to permit-the tensioned metalstrip to conform to the back up roll surface without causing permanent distortion of. the metal strip, brush.rolls journaled in said frame in position to contact the convex arcuate surfaces of .the continuous tensioned metalstrip as it. passes in said sinuous path, means for adjusting the distance between each back up 1011 and its associated brush roll for varying the pressure between the brush roll and the arcuate surface of the strip independently of the strip tension, means for maintaining the axis of rotation of eachbrush roiland its associated back up roll in parallel relationship at right angles to the path of strip travel and for maintaining the lines of contact of the brush and back up rolls with the strip always parallel, and means for rotating the brush rolls.

' JOHN s iucn'rum.