US738956A - Sandpapering-machine pad. - Google Patents

Description

No. 738,956. PATENTED SEPT. l5, 1908` C. C. STUART.

SANDPAPBRING MACHINE PAD.

AAAAAAA 'non FILED 00124. 1902.

:PATENTED SEPT. 15, 1903.

C. G..STUART. SANDPAPERING MACHINE PAD.

APPLICATION FILED 00T. 24, 1902.

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N0 MODEL.

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UNITED STATES] Patented september 15, 19031" "PATENT OFFICE.

oHARLEs c.V STUART, oF'. oAMPvILLE, coNNncrIoUr, AssIeNoRTo cREswELL a WATERS co.,vA ooRPoRATIoN oF PENNSYLVANIA.

SAN DPAPERlNc-MAol-UNE Vr-EAD.

VsriscIFIcArIcyrrforming part of Letters rat'ent No. y'73r-3,95e, atea septembery 15, 1903.

Application nea oa'obr 24,196.2. semina. matto. (No model.)

Be it known that I, CHARLES C. S'rUART,a citizen of the United States',residing at Camp-4 ville, inthe county of Litcheld'and Stateof Connecticut, have invented `certain new and usefullmpr'ovements in Sandpaperin'g #Mar chine Pads, of which the following is a'sp'eci fication.` Y My invention relates to sandpapering-ma# chines,- and has forits objectthe combined use yof abrasive rotary drums and abrasive re` ciprocating pads for finishing the stock or ma,- terial passed thereunder upon the machin'es platen or bed, together'with means whereby the pads are reciprocated by mechanism attached to the machine and a vpart thereof driven by the same power. The pads are also provided with independent means, whereby they may be separately employedor' put out of employment. Y Itis designed to provide the pads with fine sandpaper for nishing the Work and to employ the one for such purpose which the stock is passed under after it has passed under the drums which are coated with coarse, medium, and line sandpaper, in the order named, .which also" indicates the course of the stock through the machine when beingnished.

My mechanism 1s illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of so much of the machine asis necessary to illustrate the mechanism. Fig. 2 is a partial plan or top View 'showing a portion of the parts, as the pad-drivingmechanism of one side, for its reciprocation, and the pad relative position .to the drums. The parts of the driving mechanism not shown (for the opposite side of the machine) are duplicates of those shown, and the positions of the other parts can readily be understood by reference to Fig. 1. Fig. 3 is an end view of the pad-carrier. Fig. 4 is an edge view of the pad-carrier. Fig. 5 is'a detail of the pad-elevating mechanism.

Similar figures of reference indicate similar parts throughout `the views.

The machine has a central framework 1, from which at either end are extensions 2 3, on which are located the necessary appliances for moving and supporting the platen 4. Such appliances being well known'in the art, itis not deemed necessary to enter into Yany -special' description of them. The machine is provided with drums 5 6 7, .whereon is placed abrasive material, preferably coarse, medium and fine', in the order named.. These drums are rotated in` opposite directions, as indicated by the arrows, by a belt 8common to all, whichy passes over their pulleys 9 10 11, intermediate pulleys 12 13, and is Ydriven by pulley4 14. These pulleys and drums are provided with suitable shafts 15 1(5"17 1S 19 2O andbearings 21 l22 23 242526 therefor; Secured at each end of framework 1, at each side above platen 4, are guides 27 28, on which the pads 29 30 are carried for reciprocating movement parallel to platen 4 and the stock operated on. Y

Reference to Figs.' 3, 4, 5 will best show the pad construction, wherein guides 2728.are embraced by horizontal'hubs`31fof consid erable length. At the back of hubs 31 are formed vertical bosses 32 33, rising from :a plate 34. 'On plate 34 and extendingbelow it are vertical bosses35 36,'andthroughA these bosses are rods 37 '38, which supportholders 39, under which the pads 29 30 are secured at each end by bolts 40. Through holders 39 are spring-rods 41, screW-threadedin the holders, passing freely through plates' 34, and having heads 42, which enter pads 29 30, act ing as means to supportthe padsfrom being displaced when doing their work of abrasion. Y

Around rods 41, secured between Vplates 34 and holders 39, are springs 43, which permit the yielding of the pads 29 30. Lifters 44'and operated by pin 52 are provided for raising pads 29 30 clear of the stock to make them inoperative-as, for example, when the platen 4 is moving from A in the direction of the arrow with rough stock the pad would be lifted to allowthe stock to first be operated upon by the drums, 5 rough, 6 Inedium, 7 smooth, and by pad 30 superflue, and upon the return movement of the platen pad 29. can be lowered to add its finish to that already produced by pad 30. The lifters comprise a plate 45, having hubs 46 47, embracing rods 37 33 and nuts 48 49, which regulate the tension on springs 43. Under hubs 3l and at right angles .thereto are hubs 50, in which and reaching across the machine above pads 29 30 are shafts 5l, which connect opposite hubs 50. At a point under plates 45 the shafts 5l are provided with pins 52, which in their inoperative positions, as seen in Figs. 3, 5, do not engage plates 45; but when shaft 5l is rotated to carry pins 52 upward they act as cams to raise plates 45, rods 37 38, holders 39, pads 29 30, and compress springs As pins 52 reach a vertical position they enter notches 53, suspending the pads until suoli time as the operator disengages them.

The driving mechanism for reciprocating the pads are a pinion 54 on shaft l5 engaging a gear 55 on shaft 56, supported in bearings 57, together with pinions 5S, also on shaft 56, which engage gears 59 on shafts GO, supported in bearings Gl of frames 62, which are pivotally supported on shaft 56 at their outer end and at theirinner ends by knuckle-pins 63 to lugs 64, attached to framework l. Bosses 65 on gears 5f) have crank-pins 66, and thereon are connecting-rods 67, which at their inner ends engage pins G8 in levers 69. The levers (59 are fulcrumed at 70 to bars 7l, pivotally supported at 72 to framework l. The upper ends of levers 69 are secured to shaft 5l, and all of these parts except pinion 54 and gear 55 are in duplicate at each side of the machine.

In order to allow the upper ends of levers G9 to move in a straight line instead of an are, their fulcrum 70 must move upward as the lever moves each way from its vertical central position to its extreme limit of motion, and this is permitted by pivots "2. This also causes the lower ends of levers G9 to move in an irregular curve, due to the gradual raising of fulcrum 70. Connecting-rods 67 limit the movement of the lower ends of levers 65); but as pads 29 30 are free to move with the upper ends of the levers to their limit the difference in movement between an arc from a fixed fulcruln and a straight line from a movable fulcrum is readily accomplished. Fulcrums 70 have guides 73, through which are passed rods 7 4, attached to arms on shaft 5l, and are the means employed to rotate the shaft and cause pins 52 to elevate lifters 44, which elevates the pad to its inoperative position, above and out of contact with the stock. Above guides 73 stops 76 are attached to rods 74, each being provided with a handle 77. The stops abut guides 7 when the pads are dropped to their operative position. Pad 30 is similarly equipped except that pivots 70 for its guides 7 3/ are secured to supports 7S, rigidly secured to framework l. Pads 29 30 are connected for simultaneous movement by rods 79, secured to lugs SO on hubs 3l.

I claim-` 1. In a sandpapering-machine, a framework, a platen, multiple abrasive drums above the platen, and means for their rotation in opposite directions, and multiple abrasive pads exterior to the main framework, and adapted for reciprocative movements, and

means upon the machine for driving the first pad, and connections therefrom to the second pad for such movements.

2. In a sandpapering-machine, a framework, a platen, multiple abrasive drums above the platen, and means whereby the outer drums rotate in one direction while the center drum rotates oppositely, abrasive pads exterior' to the drums, adapted for reciprocative movements before and after the stock passes the rolls, means for such movements by mechanism on the machine, and means on each pad to independently place it into or out of operative abrasive position.

3. In a sandpapering-maehine, a framework, a platen, multiple abrasive drums above the platen, and means for their rotation in opposite directions, abrasive pads having means on the machine for reciprocatory movement longitudinally of the machine for one pad, with means for their connection so that the second pad shall be driven by the first, and means whereby one or both pads may be placed into operative or inoperative position independent of the other pad.

4. In a sandpapering-machine, a movable platen, abrasive drums above the platen, yielding and reciprocating abrasive pads also above the platen and connected for coperative action, means to independently put a pad out of abrasive position either during reciprocation or quiescence, means to rotate the drums, and independent means to reciprocate the pads, operated from the driving mechanism of the machine.

5. In a sandpapering-machine, a platen, abrasive drums above the platen, and means for their rotation in opposite directions, abrasive pads reaching across and above the platen, and` means for their reciprocation lengthwise of the platen, resilient means whereby the pads may press or yield toward the platen and to the stock being Worked, and means to compress the resilientA means and prevent contact with the stock aforesaid.

6. In. a sandpapering-maehine, a movable platen, abrasive drums above the platen and means for their rotation in opposite directions, abrasive pads guided parallel to the platen and reeiprocated longitudinally of the platen, levers for reciprocating the pads and driven from the machine, but separately from the drums, pivotally-supported fulerums for the levers which permit the upper ends of the levers and their connections to the pads to move in a line parallel with the platens top, connecting-rods for the levers attached below their fulerums and at the sides of the platen, and means for their` driving.

7. In a sandpapering-machine, reeiprocat- IOO ing pads guided for movement in right lines., late the levers from the machine independent centrally fulcrumed oscillating levers atof the movements for its other mechanisms. lo tached thereto which at their ends attaehed In testimony whereof I afx my signature to the pads also move in right lines, movablyin presence of'tWo Witnesses.

5 supported fulerurns for the levers which per- Y CHARLES C. STUART.

mit the pad ends of the levers to move in Witnesses: right lines and their driven ends to rise and R. C. WRIGHT,

fail for such movement, and means to osoi1- WILLIAM C. STOEVER.

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