US2393845A - Cutting machine - Google Patents

Description

7 Jan.- 29, 1946. H. A. WAGNER ETAL 2,

- ,CUTTING MACHINE I Filed Aug. 28, 1944 3 Shets-Sheet 1" ,haro/a ll. Wagner Gasfare M Wagner INVENTORS ATTORNEY Jan. 29, 1946., H. A. WAGNER ETAL 7 5 cfiwnne MACHINE Filed Aug. 28, 1944 3 Sheets-Sheet 2 f/qro/a I. We yner 6145/0" l Wagner INVENTORS A TTOR/VE) Filed Aug. 28, 1944' Jan; 29, 194

3 Sheets-Sheet 3 INVENTORS Harold 4-wa BY Gqsfare H. Wagner Patented Jan. 29, 1946 UNITED sures PATENT} OFFICE MACHINE;

HaroidlA. Wagnerand Gustavefl. Washer,

' Portland, Drag.

a pucauomaugusazs, 1944;.m1-na-5sn5sa -1: cla m. (01. .1"64'-61')' The present invention relatestocuttin'g machinesand more:particularlyato' machines which aresuitable forcutting expansion joints such as are used 'in concrete road construction:

Inlaying concrete slabs-*for roadways adjacent blocks are spaced apart by expansion-1oints-one form of which consists:of iastrip of asphalt impregnated porous fiber board. The fiber: heard is normally manufactured: in relativelyzl'arge sheets such as 4"feetiby 10 :feetan-d is impregnated' with asphalt inxtliis form. 'Thesea'largeisheets are then requiredtotbe. cutrinto'.relativelysnarrow stripsiofwarying width; depending -npon'the thick;

ness of the concrete slat). Cutting machines v presently available *f or thisuse. are air: athezanature ofshears which cut: onlypnei stripqtatxastime whereas itis desirable to;provide'a machinewhich can cut up an entire sheet in a single operation; It'is therefore; a general object? of itherv-present invention to 1 provide. a new and K improved: machine-Which. is particularly suitablewfor cutting relatively large asphalt impregnated:- porous-fiber sheets, into relatively-narrow strips; which; ma:- chine iswrelatively simple :in design; of ilowimanus facturing.andzlow 'maintenanceacost.

Alfurther obj ectof. the-invention.-isstoprovide a new and improved machine for cutting relative-:- ly largesheets =ofv material such as.-aspha1t. impregnated porous fiberboard, into. relatively'nah row strips, which machine I is capable of relative-.-

1y quiek adjustmentcfor. cutting-,stripseof different the discs extending closely together in'a' slightly overlapping relation, the discs:overlappingisubstantially in line with the'topof thet'ablel The discs are axially'adjustableupon' the shafts in accordance with the width ofthe, 'stripsto be cut. The shafts are of'a length'somewhat' reat"- er than thewidth of'the table and the discs are movable to an inoperative. position" orr the overhangingends of the shafts "to which'position the excess discs may' be inovedwvithoutirequirinatheir. removal from the machine;

For a consideration of whatislbelieved novel and' inventive; attention lisrdire'ctedtito.thesfollowing description takenlinlconnection withsthe accompanying: drawings while: the -;featureszof; noveit'y will be pointed; out with; greater; particularity in :the appended :cla'im'.

In the drawings, fig: .1. is a .vertical cross-sectional .viewzthrough athe. machine; ;Fig,- 12 :is aplan viewof the: machine; Eigi/Iiviss as side. elevation 0f Ithe-.1machine:;;Ei-g; his zassideview of. the machineztakenzalongzthe line 41-4 'ofiEig. 5; Fig; 5 is. a. view ofi the "machine. taken; along,-?the-.- line 5+4 ofzli igul: Fig.:6;isa.-view in perspective-illustrating inienlarged detail onewof the:- cutter discs embodied; in the machine; and 2 Fig. 7 is a crossesectional view: taken through: the cutter disc'zunitaofalfig 6.

Referring now to the drawings and .-.1n-ore particularlyto the views of Figs. 2 and. 3; the. cuttingmachine-of the invention comprisesa frame structure. including a .pair of oppositely disposed housingtsections. I0 andJl-I and a pair of. table extensions. Ilan'd I3 Theta-ble-extensions I2 I and I 3' areof awidth correspondingsubstantial]y to the: width (if-the sheets :ofmaterial which. are to. be. cut into. a plurality. of.-. relatively. narrow strips. liheetable top I2 .onthe forward sideto the machineis adapted for. receiving theslieets of raw materialbeing fed to. the. cutter knives while the-table I3- is: adapted. for receiving the strips discharged from .the machine. For. facilitating the. alignmentof the. sheets .atright .angles, to. the axis of the.rotary cutter. knives .an upstanding ledge .I 4 isprovided Jalong one1edge .of the tableIZ. For convenience tablesIZand I3 may be rigidly. secured to the. machine itselflby braces I5 as illustrated in the drawings, though iteisito be understoodthatthe tables may. be provided. as separateunits if desired;

Theirame. structure. also. includes a pair of vertically extendinglwalls I'tiand I'I. (see Fig. 5) arranged adjacent each. of the. opposite sides of the.tablell2'l3 and .a pair ofouter wallslli'and IQ'eXtending. parallel with and in a spacedrelation with respectt'o the first :pair iof walls It and I1. The walls It, I'Iand I8a're securedrigidly together by transversely extending members 21 The walls I6 and I8 define'the'rigid housing; sec:- tion I llliwhilethecwalls I I and I Q-defi'ne 'the hous ing. section H. The end wall IBQis hingedIy 'mount'edfalong one sideinord'erto' provideready access? to the. mechanism mounted therewithin.

A paircfparailel "shafts2'3 and 24- are rotatably journaled in the walls I! and I8 in a vertically disposed relation to each other and extending transversely relative to the table I 2-l3. The wall [6 is provided with a relatively large opening 25 through which the shafts extend. Mounted upon the shafts 2324 are a plurality of pairs of similar cutter discs 26 which are mor clearly illustrated in the enlarged views of Figs. 6 and 7. The discs 26 are. mounted upon hubs 21 and secured upon a shoulder of reduced diameter by means of nuts 28. In order to prevent relative rotation between the hubs 21 and the supporting A suitable arrangement of feed rollsare pro- 7 vided both fore and aft, of the knife discs and as illustrated in the drawings, similar pairs 45, 46

and 41, 48 are, mounted between the inner frame walls l6 and ll of the machine. The lower rolls 7 V 46 and 48 are rotatably' journaled'within fixed shaft, a suitable key 29 is provided therebetween'.

The shafts 23 and 24 are each provided with a I plurality of fiat-bottomed notches 3| spaced a predetermined desired distance apart, and which are adapted to receive the end of the set screw 32 provided in the hubs 21. The vertical spacing between the shafts 23, 24 and the diameter of the discs 26 is such that the knife edges overlap somewhat as shown more clearly in Fig. 7, the point of overlap of the discs occurring slightly above the level of the table I2 and I3.

The spacing between the cutter discs or knives may readily be adjusted in accordance with the Width of the strips to be cut from the-sheets sim-, ply by loosening the set screws 32 and sliding the hubsupon thesupporting shafts to the desired position and again tightening the set screws. It

will be obvious that it is not essential for flattened notches 3| to be provided on the shafts 23, Hand which may be undesirable in-the event that the Width of thestrips to be formed thereby vary by uneven increments. If, on the other hand, the width of the strips vary by even increments, such as one-half. inch, then the flattened notches greatly facilitate rapid adjustment of the knives since the set screws centering in the notches 31 will automatically position the knives accurately in a cooperatively spaced relation.

It will be obvious that in cutting relatively nar-, row strips a greater number of knives will be required than for cutting wider strips. According to the present invention the excess knives may readily be shifted to an inoperative position upon the shafts without requiring the complete removal of such excess knives from the machine. The shafts 23 and 24 extend through the frame wall I6 and are journaled upon the outer wall 18 whereby end portions of the shafts of suitable length overhang the edge of the table l2-- l3. The opening 25 in the wall I6 is of suflicient size so that the knives 26 may be slid along the shafts into the end housing I ll out of sight, and out of the way. The upper curved wall of the housing It! may be hinged'at one-end so as to providea door 35 through which access may be had to the knives arranged upon ends of the shaftsextending therewithin;

In cutting through a material impregnated with asphalt there will be an inherent tendency for the asphalt to gum up on the knife edges and which if not counteracted would foul the machine in short order. As illustrated, the present machine is provided with a trough '31 extending beneath and parallel with the lower shaft 24 and spaced therefrom so that the upper edges of th trough side walls are somewhat above the lowermost por; tions of the respective knives. The trough 31 .is filled with a suitable solvent so that the knife edges rotating therein are kept clean. Secured between'the upper portions of the frame walls I6and I1 is a tubular header 38 which is kept fllledwith solvent pumped thereto by a small pump bearings whereas the upper rolls 45 and 41 are journaled in bearings provided in the outer ends v of arms 49 and 50, respectively, which arms are [lpivotally secured at their opposite ends onto the frame walls. The rolls 45 and are free to move up and down in an are about the pivotal point of "the shaft 24.

of the supporting arms 49 and 50 but are biased by their own weight into engagement with the 7 lower rolls 46 and 48. r

The machine may be driven by a suitable motor 50 mountedwithin the housing H, the motor 59 mounted on the lower shaft. Thelower feed rolls 46 and 48 are driven through chains 56 and 57 respectively from the shaft 24, the chains 56 and 51 being trained about a sprocket provided on the ends of shafts fixedly secured to the correspondmg rolls. The pump 39' may also be driven such I as bythe belt 59 from the shaft 24. In theillustrated modification power drive is provided only forthe lowermost of each of the two pairs of feed rolls.

The shafts 23 and 24 should be of a relatively large diameter in order that they will not be sprung apart at the center due to the resistance of the sheetmaterial which normally tends to wedge theknives of the different pairs apart. In order to affect clean cutting of the sheet material, it will be obvious that the'knife edges should be maintained closely adjacent each other at ali times.

The cutting machine of the invention has a relatively pleasing appearance due to its'symmetrical design and having substantially similar I housings l0 and H on each of the opposite sides,

one enclosing the drive mechanism and the other enclosing the excess'knives. The knives positioned upon the outermost ends of the shafts '23 and 24 within the housing 10 are protected from injury while not in use while the housing fur thermore safeguards against clothing of workmen getting caught in the revolving parts.

Having described the invention in what is con sidered to be a preferred embodiment thereof, it

is' desired that it be understood that the specific spaced similarly above and below'the level of said table portions, a plurality of cooperating pairs of cutter discs secured to said shafts, the discs of each of said pairs secured to different shafts, an enlarged opening in the inner Wall of one of said housings between said adjacent table ends, said pair of driven shafts extending through said openings and journalled in the outer wall of said one housing, motor means in the other of said housings and connected for driving said shafts, a trough for containing solvent mounted beneath the lower one of said shafts and extending through said opening, the cutter discs on said lower shaft depending into said trough, said discs being movable along said shafts, and said opening in said one housing wall being of sufiicient size to permit unused discs to be slid therethrough onto the shaft portions extending within said one housing.

HAROLD A. WAGNER.

GUSTAVE H. WAGNER.

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