US1430754A - Grinding machine - Google Patents

Description

M. O. REEVES.-

GRINDING MACHINE. APPLICATION FILED JAN.26, I920. 1,480,?54.. Patented 0ct.3,1922.

2 SHEETSSHEET 2 g g/071110111 4 85k I (Ill 'IIIIIII/ Patented Uct. 3, 1922.

STATES PATENT OFFICE.

MILTON O. REEVES, OF COLUMBUS, INDIANA, ASSIGNOR T0 REEVES PULLEY (10., 0F COLUMBUS, INDIANA, A CORPORATION OF INDIANA.

GRINDING MACHINE.

Application filed January 26, 1920. Serial No. 354,079.

T 0 all whom it may concern Be it knownthat I. MILTON O. REEVES, a citizen of the United States. residing at Columbus. in the county of Bartholomew and State of Indiana. have invented a new and useful Grinding Machine, of which the following is a specification.

Itis the object of my invention to provide a grinding machine for accurately grinding round articles. of any size, especially where the articles are conical or partly cylindrical and partly conical. More particularly, it is the object to withdraw endwise from the entrance end of the grinding throat the articles being ground, which entrance endis the larger if the articles have conical surfaces, against the normal feeding action on such articles if the machine is set to produce such action.

My present invention is in some respects based on that set forth in my prior Patent No. 1,261,129, granted April 23, 1918; and embodies some features in common with m co-pending applications Ser. Nos. 298,00 and 298,008, both filed May 19, 1919.

The accompanying drawings illustrate my invent-ion: In such drawings, Fi 1 is a front elevation of a grinding mac ine embodying my invention; Fig. 2 is a section on the line 2-2of FigIl; Fig. 3 is a partial plan. of the mechanism at the inding throat; Fig. 4 is a section on the l1ne' 14 of Fig. 3, looking in the opposite direction from Fig. 2; and Fig. 5 is a section on the line 5-5 of Fig. 4.

On the base 10 are carried three adjustable frames 11. 12-, and 13, the first of which is adjustable vertically by an adjusting wheel 14 and the other two of which are independently adjustable longitudinally of the base 10 by a crank'ie and a hand wheel 16' respectively. The frames 11 and 12 are arranged to be clamped in adjusted position by suitable clamping screws 17 and 18 re spectively. The vertically adjustable frame 11 carries a longitudinally extending hori zontal shaft 19, which at its end toward the frame 12 has mounted thereon a wheel 20, preferably an abrasive wheel, which on one end has an annular .face 21. The wheel 20 is the feed'wheel, and in the grinding opera tion is driven at comparatively slow speed 1n the direction of the arrow. The longitudinally adjustable frame 12 is adjustable toward and from the feed wheel 20 by the crank 15, and for accuracy for adjustment, to take up all lost mot-ion, is associated with a weight 15 which tends to move it away from the feed wheel and so holds it to one limit of the lost motion which would otherw se be permitted by its adjusting mechanlsm. This frame 12 carries a horizontal shaft 22, transverse to the direction of ad ust-ment of such frame and to the shaft 19. The shafts 19 and 22 are driven in any suitable way which allows the adjustment of the frames 11 and 12; but asthis driv ng arrangement is no part of the present invention it is unnecessary to show it or describe it in detail. The shaft 22 carries an abrasive wheel 23. having a peripheral grinding face24, and is driven at comparatlvely high speed in the direction of the arrow. The abrasive wheel 23 is the grinding wheel. The peripheral face 24: of the grinding wheel 23 where it moves downward opposes the annular working face 21 of the feed wheel 20 where it moves upward, to provide between them a grinding throat in which the grinding of the round articles 25 occurs. The width of this grinding throat is adjustable by shifting the frame 12 by the crank 15. The narrow point of the grinding throat is in the horizontal plane through the axis of the grinding wheel 23 when the face 21 is flat and vertical, as I usually have it, as such plane is then perpendicular to the working face 21 of. the feed wheel 20 at the grinding throat. The height of the shaft 19 with respect to this horizontal plane is adjustable by the I it possible to grind articles either cylindrical or conical as desired.

.'The round articles 25 to be ground are supported in the grinding throat on a feed bar 30, which is carried by the longltudinally adjustable frame 13, on which .both ends of the feed bar are supported. To obtain this support, the frame 13 is in the shape of an inverted horse-shoe, as is aparent from Fig. 2. The feed bar, as shown, 1s clamped to one face of the frame 13 -by clamping bolts 31 extending through vertical slots 32 in the feed bar; and it rests at both ends on temper screws 33 so that by the adjustment of such screws the feed bar may be vertically adjusted relatively to the grinding throat, to bring the axes of the articles to be ground substantially into the plane of the narrow point of the grinding throat, the feed bar when adjusted being clamped in adjusted position byxthe bolts 31. The feed bar may be made ina single piece, such as for the sake of simplicity is shown in the drawings; or may have any desired removable and replaceable and adjustable parts,

such as some or all of those set forth in my aforesaid co-pending application Ser. No. 298,007, or anydesired mounting, such for instance as that shown in my aforesaid copending application .Ser. No. 298,008.

In order tov limit the movement of the articles 25 in one direction along the grinding throat, as shown toward the back of the machine,,a stop plate 40 is slidably" mounted on the upper edge of the feed bar 30. This stop plate is provided with longitudinal slots 41, through which extend guide bolts 42 which may be set into any of a seriesof holes 43 in an upwardly projecting plate 44 suitably fastened to one side of the feed bar 30, as by screws 45.- A pin 46 projects from the stop plate '40 through a slot 47 in the plate 44, and between this pin and the rear end ofrthe feed bar 30 extends a tension spring 48 which tends to move the stop plate 40 backward. This backward movement of the stop plate 40 is limited by a stop screw 49, carried by and adjustable in a small upwardly extending plate 50 which may be attached by bolts 51 to the feed bar 30 at any desiredpoint along a series of holes 52 prbperly spaced to receive such screws. A forwardly projecting rod 53 is also attached to the pin 46, and is provided -with a handle at its forward end, so that by pulling suchhandle the stop plate '40 may be drawn forward against the action of the spring 48, but will be returned by such spring into engagement with the stop screw when such handle is released. The stop plate 40 limits the movement towardthe backof the machine of an article to be ground, and by pulling such stop plate forward by the handle 53 such article may be ejected at the forward or entrance end of the grinding throat, The article may be allowed to project out of the rear end of the grinding throat to any desired extent, by proper setting of the screws 42, 51, and 49.

The vertically adjustable frame 11 and the longitudinally adjustable frame 12 are provided with suitable dressing devices 60 and 61 respectively, for dressing the working surfaces 21 and 24 of the wheels 20 and 23 for any positions of such frames, so that such dressing may be done without disturbing the adjustment of such wheels. Each of these dressing devices comprises a cutting diamond 62, carried in a suitable movable frame 63 so that the depth of cut may be adjusted by an adjusting screw 64 and the movable frame 63 may be moved along a suitable slideway 65 by a hand wheel 66 to cause the cutting diamond to travel across the face 21 or 24 to true it. The angle of one or both of the slideways 65 may be made adjustable in relation to the axis of the associated wheel. As shown the slideway 65 for the grinding wheel 23 is so adjustable. This adjustability may be obtained in various ways, but is shown as being obtained by mounting the adjustable slideway 65 at eachend on a supporting bar 67 by screws 68 provided with lock nuts and extending from theslideway 65 through the support- -ing bar 67, and a'push screw 69 located between the two screws 68 and acting to push the associated end of the slideway 65 away from its supporting bar 67. By manipulating the screws 68 and 69, either or both ends of the slideways 65 may be pushed away from its supporting bar by a controlled dis tance, and yet held firmly, though preferably only one end is so pushed away while the other end is held tight against such supporting bar. This adjustment of the screws 68 .and 69 adjusts the angle between the slide- In operation, the articles to be ground are fed into the grinding throat in any suitable manner, whichv may be by placing them manually on the feed bar 30 and pushing -them'forward until they are caught'by the surfaces 21 and 24. When such an article is so caught, it is slowly rotated by the action of the feed wheel 20 and ground to true ground form by the grinding wheel 23 as it rotates. In addition to its rotation, I preferably give the article 25 a. forward feeding movement through the grinding throat, from the outside toward the center of the feed wheel 20, by having the axis of such feed wheel slightly lower than the axis of the article being ground, so that such article in addition to' being rotated is moved along its axis by the action thereupon of feed wheel. The rate of feeding movement is controlled by varying the height of the axis of the feed wheel 20, by proper manipulation of the hand wheel 14. This feeding movement is due to the fact that when the axis of the feed wheel 20 is below the horizontal plane of the grinding throat, the movement of the face 21 at such horizontal plane, where it operates on the article 25, has a slight componentqlengthwise of the throat, and this lengt-hwisecomponent feeds the article along the throat. U By this feeding action, an article 25 is fed through the grinding throat, and across the face 24:, until it is stopped by engagement with the stop plateO. Then by pulling such stop plate forward by the rod 53, the article 25 being ground is shoved backward out of the grinding throat at the entrance end, and may be removed from the feed banin any suitable manner. The stop plate is set to stop the article 25 at any desired point, either with or without a part protruding from the rear end of the grinding throat. Any such protruding part at the rear end of the throat will of course be cylindricah.

but the part which is in the grinding throat may be cylindrical or conical, and my present invention is particularly applicable where it is desired to have it conical; The angle of the cone is controlled by the angular setting of the slideway of the dressing device 61, and the dressing of the face 24 .thereby, to get the desired angle between the faces 21 and 2d at the grinding throat. In this way it ispossible to grind either conical articles, or articles which are partly conical but have a cylindrical portion at the smaller end of the cone; and in either case the conical portions may have at their larger ends portions of various shapes which are not allowed to enter the grinding threat. The length of the cylinder at the smaller end of the cone may be varied by changing the setting of the stop plate 40. When such cylindrical portions are provided at the smaller endsof the cones. the upper surface I of the feed bar 30 over which such protruding cylindrical portions lie must of' course be cut away, as indicated at 30',to

prevent displacement of the axes of the articles being ground.

I claim as my invention: 1. In a grinding machine, the combination of a grinding wheel, a feed wheel, said two wheels forming a grinding throat between them for grinding round articles therein,

means for supporting articles to be ground in said throat. and a forwardly movable stop member for limiting the movement of articles at the rear of said grinding throat and pushing them toward the front of said throat.

2. In a grinding machine, the combination of a grindin wheel, a feed wheel, said two wheels formlng a grinding throat between them for grinding round articles therein,

means for supporting articles to be ground in said throat, a forwardly movable stop member for limiting the movement of articles at the rear of said grinding throat and pushing them toward the front of said throat, and means accessible from the front and adjust-able means for limiting the rear-- ward movement of said stop member.

4:. In a grindingmachine, the combina-v tion of a grinding wheel, a feed wheel, said two wheels forming a grinding throat between them for grinding round articles therein, means for supporting articles to be ground in said throat, a forwardly movable stop member for limiting the movement of articles at the rear of said grinding throat and pushing them toward the front of said throat, and a spring tending to move said stop member rearwardly.

5. In a grinding machine, the combination of a grinding wheel, a feed wheel, said two wheels forming a grinding throat between them for grinding round articles therein, means for supporting articles to be ground in said throat, a forwardly movable stop 'member for limiting the movement of articles at the rear of said grinding throat. and pushing them toward the front of said throat, and means for varying the angle formed by the working faces of said wheels at said throat.

6. In a grinding machine, the combination of a grindin wheel having a peripheral grinding suace, a feed wheel having an annular end surface, said two wheels being arranged so that their working surfaces oppose each other at one point to form a grinding throat, a feed bar for supporting articles to be ground in said throat, and a stop member for limiting the movement of articles along said throat in one direction, said stop member being movable in the other direction to force said articles in the latter direction along said throat. i

7. In a grinding machine, the combination of a grinding wheel having a peripheral grinding surface, a. feed wheel having an annular end surface, said two wheels being arranged so that their'working surfaces oppose each other at one point to form a grinding throat, a feed bar for supporting articles to be ground in said throat, a stop member for imiting the movement of articles along said throat in one direction, said stop member bein movable in the other direction to 7 force said articles in the latter direction along said throat, and means for adjustably limiting the movement of said stop member 10 day of January, "A. D. one thousand nine 15 hundred and nineteen.

MILToN' o. REEVES.

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