US761276A - Roll-grinder. - Google Patents

Description

. No. 761,276, PATENTBD MAY 31, 1904 w. R. WEBSTER, JR. ROLL GRINDER.

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PATENTED' MAY 31, 1904. 7

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ROLL GRINDER. APPLICATION FILED D3018, 1902. BBIEWEDbBtLll. 1903.

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Lratented May 31, 1904.

PATENT OFFICE.

WILLIAM R. WEBSTER, JR, OF BRIDGEPORT, CONNECTICUT.

ROLL-GRINDER.

SPECIFICATION forming partof Letters Patent No. 761,276, dated May 31, 1204. Application filed December 18. 1902. Renewed December 11, 1903. Serial No. 184,833. (No model,)

To all whom it may concern:

Be it known that I, WILLIAM R. VVnBs'rnR, J r., a citizen of the United States, residing at No. 126 Elmwood Place,Bridgeport, Connecticut, have invented a new and useful Improvement in Roll-Grinders, of which the following is a specification.

My invention relates to devices for grinding the rolls used in reducing the thickness of brass, copper, or other metals. Largely by reason of the variation in the widths of the metal handled these rolls are rapidly worn to irregular contours, which necessitates frequent regrindingr This has frequently been I 5 done by hand, the operator using a chiselshaped stick in which emery is embedded. This is held against the adjacent faces and moved from end to end of the rotating rolls.- It is clear that the abrasive effect at any particular point on the roll will depend (the pressure being constant) on the duration of contact-z. 6., it will be inversely as the speed at which the stick traverses the roll at this point. Ordinarily the best results in rolling copper and its alloys are obtained by having the rollsin' the form of a truncated ovoid. In the case of a pair of rolls used for sheet-brass and, say, sixteen inches in diameter and thirty-six inches in length the diametric difference between the center and the ends of each roll commonly approximates .003 of an inch. It is obviously very difficult to obtain this accuracy by manual operation.

The special feature of my invention is the automatic alteration of the traversing speed of a grinder at any point of its travel over the face of the roll. My device will therefore automatically and accurately grind such rolls to produce any desired contour.

In the drawings, Figure 1 is an end elevation of a pair of rolls, a roll-frame, and my grinding device attached thereto. To show the device more clearly, the nearer side of the roll-frame is omitted. Fig. 2 is a top plan view of the device, showing its attachment to the frame. Figs. 3 and 4 are enlarged details of the friction-pulley 5 and connected parts. Fig. 5 is amodification of the grinder of the device. a

1 designates a well-known form of rollframe, provided with a guide-bar groove 11 and carrying a pair of rolls l2 12. A substantially rectangular frame 2 is provided, with adjustable anchors 21 and with braces 22 adapted to support it in rigid relation to the frame 1. A traveling bar 3 has long bearings 31 32, moving on the rods 23 24 of the frame 2, and a nut 33, engaging with a lead-screw 4, which is supported in bearings 41 42 on the roll-frame 2. At the rear end of the bar-3 is an idler 34, the function of which will hereinafter appear. At its forward end the bar 3 is provided with means for the rigid attachment of a grinder 35, (here shown as a wooden block,) its upper and lower faces, in which emery or other abrasive substance is embedded, being grooved to bear against the adjacent faces of the pair of rolls 12 12. At the end of the lead-screw 4 is a friction-plate 43. Bearing against the face of this plate 43 is a friction-pulley 5, longitudinally movable on a splined shaft 51, which is supported in the frame 2. The shaft 51 carries a pair of bevel-gears 52 53, engaging with acorresponding gear 9, mounted on a shaft 91, which is provided with a pulley 92. A clutch 54, splined on the shaft 51, engages alternately with the gear- wheels 52 and 53. Abell-crank lever 55, which operates the clutch, is connected to a rod 56, which is longitudinally movable under the rod 23, and is provided with two adfjustable tappets 57 58 in the path of the travfeling bar 3. On the friction-pulley 5 is a groove 59, in which engages a fork 6, through the nut portion 61 of which passes a threaded shaft 62 (VvlcZeFigs. 3 and 4.) The shaft 62 is Q longitudinally movable in a bearing 63 and has at its rear end a hand-wheel 64 and a grooved i collar 65.

On the frame 2 is a pair of rearwardlyj projecting rods 25 25, on which slides a contour-bar 7-, against the inner face of which 1 the idler 34. bears. To secure perfectly-even travel of both ends of the bar 7 on the rods 25, any form of a parallel-motion device may be used. I have shown a pair of inwardlydirected rods 8, rigidly secured at one end to ,the frame 2 and having at their free ends pins 81, on which turn levers 82. The outer ends of the levers 82 have slotted engagement with pins near the respective ends of the contour-bar 7, while their inner ends have intermeshing teeth 83. The contour-bar 7 is drawn toward the roll by a pair of strong springs 72.

To the end of the bar 7 is secured a fork 71, engaging the collar on the shaft 62.

Fig. 5 of the drawings shows a commercial form of motor-driven emery grinder, mount ed on the bar 3 and taking the place of the block 35.

The operation of my device will be readily understood from an inspection of the drawings. The pulley 92 is driven by a belt (not shown) which may connect it to a pulley on the roll-wabbler or to any other source of power. Assuming that the gear 52 is clutched to the shaft 51, the friction-pulley 5 will act to rotate the plate 43 and the lead-screw 4, so as to drive the traveling bar 3 toward the left of the drawings, Fig. 2. When the bar 3 moves the tappet 57, the clutch will release the gear 52 and engage the other gear 53 with the shaft 51, thereby reversing its rotation and driving the bar 3 toward the tappet 58. To insure a full movement of the clutch, I have shown springs on the rod 56 between the bar 3 and the tappets. It is obvious that the block 35 will pass continuously from end to end of the rolls 12 and will grind their faces. It is also evident that the rate of movement of the grinder 35 on the rolls is governed by the position of the pulley 5 radially of the plate 43. As the bar 3 traverses the frame 2 the idler 34 bears against the inner face of the curved bar 7. The bar 7 is connected by means of the fork 71 with the collar 65 on Y the shaft 62. This shaft 62 carries a fork 6,

which by reason of its engagement withthe collar 59, transmits the motion of the contourbar 7 to the pulley 5, which it moves longitudinally of the shaft 51, and hence radially on the friction-plate 43. When the bar 3 is near the end of the roll, and consequently near the end of the contour-bar 7, the bar, if of the concave form shown, will be forced backward from the roll, will draw the pulley 5 away from the center of the plate 43, and hence will slacken the speed at which the grinder 25 moves on the roll 12. As the bar 3 nears the middle of the curved bar 7 the springs 72 will draw the curved bar forward and the rate of travel of the grinder on the roll will increase. In this way the roll will receive a diminished abrasion toward the center and the desired ovoid form will be obtained.

It will be readily understood that the substitution of a contour-bar 7 differing in curvature from that shown will correspondingly alter the contour of the roll. It will also be understood that such contour may be convex, concave, or straight or that by the use of a bar of irregular curvature experimentally designed any desired broken contour may be formed. My device, however, offers a means by which varied diametric differences in the roll may be made with the same contour-bar.

By means of the hand-wheel 64 the initial position of the pulley 5 on the plate43 may be alterede. g., I will assume that the curve of the inner face of the contour -bar varies one inch from a straight line. Then if the bearing-line of the pulley 5 on the plate 43 is one inch from the plates center when the grinder 35 is at the end of the roll it will obviously be two inches from that center when the bar 3 is at the middle point of its travel. The roll will in this case be ground twice as much at its ends as at its center; but if the pulley 5 is set three inches from the center of the plate 43 when the grinder is at the end of the roll it will be four inches out when the grinder is midway of its path, and the abrasive effect at the roll ends will be only one third greater than at the center.

What I claim is 1. A roll-grinder provided with means for automatically varying the speed at which it travels longitudinally of the roll.

2. A roll-grinder mechanically carried longitudinally of the roll and provided with means for automatically varying its rate of travel at any desired point.

3. A roll-grinder mechanically carried longitudinally of the roll and provided with manually-adjustable means for automatically varying its rate of travel at any desired point.

4. A roll-grinder mechanically carried longitudinally of the roll and provided with means by which its rate of travel is automatically increased as it nears the middle and decreased as it approaches the ends of the roll.

5. A roll-grinder mechanically carried longitudinally of the roll and provided with means by which its rate of travel is automatically increased as it nears the middle and decreased as it approaches the ends of the roll and withmanually-adjustable means for varying such increase and decrease.

6. In a roll grinder in combination a grinder-frame, means for securing said frame adjacent to the roll, a bar on said frame adapted to travel longitudinally of the roll,a grinder carried by said bar, means, as a lead-screw, for actuating said bar and means for automatically Varying the speed of said lead-screw during each traverse of said bar.

7. In a roll grinder in combination a grinder-frame, means for securing said frame adjacent to the roll, a bar on said frame adapted to travel longitudinally of the roll,a grinder carried by said bar, means, as a lead-screw, for actuating said bar and manually-adjustable means for automatically varying the speed of said lead-screw during each traverse of said bar.

8. In a roll grinder in combination a grinder-frame, means for securing said frame adjacent to the roll, a bar on said frame adapted to travel longitudinally of the roll,a grinder carried by said bar, means, as a lead-screw,

for actuating said bar and means, as a curved with said bar whereby the rotative speed of said lead-screw may be varied.

10. In a roll grinder in combination a grinder-frame, means for securing said frame adjacent to the roll, a grinder-carrying bar, a lead-screw in said frame adapted to move said grinder-bar longitudinally of the roll in either direction,means controlled by the movement of said bar whereby the rotation of said lead-screw may be reversed and manually-adjustable means also controlled by the movement of said bar whereby the rotative speed of said lead-screw may be varied.

WILLIAM R. WEBSTER, JR.

Witnesses:

GEO. L. COOPER, KATH. M. FARRELL.

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