US2507334A

US2507334A - Grinding of rollers

Info

Publication number: US2507334A
Application number: US720247A
Authority: US
Inventors: Raymond H Cramer
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1947-01-04
Filing date: 1947-01-04
Publication date: 1950-05-09
Anticipated expiration: 1967-05-09

Description

May 9, 1950 R. H. CRAMER GRINDING 0F ROLLERS Filed Jan. 4, 1947 !FigA- HIS ATTORNEM Patented May 9, 1950 GRINDING OF ROLLERS Raymond B. Cramer, Bloomfield, N. .L, aslignor to General Motors Corporation, Detroit, Micla, a corporation of Delaware Application January 4, 1947, Serial No. 720,247

" 14 Claims. (Cl. 51-74) This invention relates to the grinding of rollers and is especially adapted for the grinding of rollers which are curved lengthwise such as barrel shaped rollers. An object of the invention is to provide a machine for grinding barrel-shaped and other rollers in each direction of oscillation of a regulating wheel and work blade, the regulating wheel having two intersecting surfaces conforming to the rollers, and the work blade having two work rests used alternately.

To this end and also to improve generally upon machines of this general character, the invention consists in the various matters hereinafter described and claimed. In its broader aspects, the invention is not necessarily limited to the specific construction selected for illustrative purposes in the accompanying drawings in which:

Fig. 1 is a plan view with two work feeders in section;

Fig. 2 is a side view of Fig. 1, parts being omitted;

Fig. 3 is a side view chiefly of the work feeder;

Fig. 4 is a front view of a feeder, a front cover being omitted.

Fig. 5 is a top and rear view of the work blade.

Fig. 6 is a view similar to Fig. l, the parts being shown in a central position and to smaller scale.

Fig. 7 is a side view of a standard.

Heretofore barrel rollers have been ground in very large quantities according to the method of patent to Cramer 2,218,982 and by machines similar to Cramer 2,156,562. These machines ground rollers in one direction of oscillation, the other stroke being idle. Attempts have been made to grind rollers in both directions of oscillation somewhat as suggested by the Binns Patent 1,654,236 but success was not obtained.

When grinding rollers which are curved lengthwise, such as barrel rollers, the gringing wheel G has a concave profile being curved on a radius to fit the curvature of the work. A regulating wheel R oscillates with respect to the grinding wheel around a center concentric with the concavity of the grinding wheel. Both wheels preferably rotate on horizontal axes, the grinding wheel downwardly at the work and the regulating wheel upwardly. The regulating wheel has two intersecting profiles 2 and 4, each curved to fit the work. Oscillating as a unit with the regulating wheel is a work blade 5 having two roller rests 6 one on each side of an upstanding lug 8 at the center of the blade. Each rest inclines downwardly towards the regulating wheel and is curved lengthwise to fit the work. Each rest is open and unobstructed at one end while the other end terminates in a flat locating face l0 each of a 2 which will engage the flat end of a roller and push the roller endwise. Each face is at a predetermined distance from the center or deepest portion of the concave rest, this distance being equal to the distance from the end face of a roller to its plane of maximum diameter. with the flat end of a roller firmly against the face It, the roller axis is located perpendicular to the face in and the periphery of the roller will then fit the concave rest and the regulating wheel. The numeral It in Fig. 5 indicates a plane through the middle of a roller rest and perpendicular to the base of the machine. The center of curvature of the rest is not in this plane but is located in a plane l6 parallel to the face l0 and inclined at a small angle to the plane it. As a result each rest has a little slope and each roller is supported with its axis slightly tilted or skewed out of the horizontal and hence will be urged endwise against the locating face Ill when rotated between the wheels.

The blade is clamped in a recess at the front of a standard l8 which is also arcuately recessed at 20 to accommodate the regulating wheel and to let it approach closely to the blade. As shown in Fig. 5, the blade is arcuately curved on one side to clear the grinding wheel, the other side bein straight except for a little rounded recess to clear the rib formed at the intersection of the wheel surfaces 2 and 4. The standard has a recess 21 at one side for a clamping plate 22 having one end 24 overhanging the bevelled end of the blade, the other end of the blade taking under an overhang 25 of the standard. A cam plate 26 having an inclined surface is fastened to the top of the standard at each side, one cam plate extending over the plate 22. A finished roller slides down this inclined surface when a thin stripper 28 is advanced over the lug 8 before the oscillating unit swings from the loading position indicated in Fig. l to the position of Fig. 6. The oscillating unit including the standard and the blade, plus the regulating wheel with its driving means may be mounted and oscillated by any suitable mechanism such as indicated in Cramer 2,156,562. The stripper is a thin plate attached to a. projecting foot or pusher 30 on the lower end of an oscillating lever 32 pivoted at 34 on a chute 36 down which the rollers move sidewise by gravity, the column of rollers first being supported on the foot 36. Then, as the lever oscillates to the-broken line position of Fig. 3, the lowermost roller drops in front of the foot onto an inclined surface 38 and is afterwards pushed up the incline onto the blade.

There is a'similar chute It at each side of the grinding wheel and the corresponding levers 32 are operated in succession. The rollers are fed endwise by any suitable feeder through a flexible pipe 40 and onto a pair of spaced ledges 42 connected by a thin bridge piece 44 just behind the vertical runway of the chute. A cover 45 shown only in Fig. 3 closes the front of the runway. Behind the bridge piece 44, the spaced ledges form a slot in which the lever 32 can oscillate, the front of the lever having a cut-out recess at 46 to clear the bridge piece ll. The upper end of each chute has a horizontal extension 41 secured to a horizontal supporting plate 48 carrying a cylinder 50 whos piston rod 52 is connected by a link 54 to the upper end of the lever 32. The front end of the plate 48 is slotted to accommodate oscillation of the lever. Anticlockwise oscillation of the lever pushes a roller from the spaced ledges l2 and the bridge piece 44 into the vertical runway while the lowest roller in the runway drops onto the incline 38 in front of the foot 30. Clockwise oscillation of the lever pushes this roller onto its rest while the upper portion of the lever frees another roller for endwise advance ready to be pushed sidewise into the runway.

Fig. 1 shows the oscillating unit swung to one limit, the letter A indicating a finished roller about to be ejected and the letter B indicating a new roller pushed forward by the foot 30 onto the rest where it engages the suriace 2 of the regulating wheel. The stripper 28 is carried forward close to but above the lug 8 and between the rollers A and B. As the unit swings to the position of Fig. 6, the finished roller A is arrested by the stripper and slides down the incline of the cam plate 26. The new roller .8 is urged against its locating face I!) due to its rotation on a slightly tilted axis and is pushed endwise along the arcuate face of the grinding wheel. In the meantime at the opposite side of the grinding wheel another roller C drops down in front of the foot 30 of the opposite feeder ready to be advanced onto the empty rest when the roller B has been ground and carried past the feeder to ejecting position. Upon clockwise swinging, this roller B is stripped and the roller C is carried along the grinding wheel and ground on the rest previously occupied by roller A. The roller rests preferably support the rollers with their axes slightly above the plane connecting the wheel axes.

I claim:

1. In a machine for grinding rollers which are curved lengthwise, a grinding wheel having a curved profile corresponding to the curvature of the rollers, a regulating wheel having a pair of adjacent profiles corresponding to the curvature of the rollers, a work blade between the wheels, the regulating wheel and the work blade being oscillatable as a unit about an axis extending through the center of curvature of the grinding wheel profile, and the work blade having a pair of roller rests confronting the adjacent profiles .of the regulating wheel.

2. In a machine according to claim 1, each roller rest being generally sloped lengthwise to hold a roller slightly skewed with respect to the roller engaging surface of the regulating wheel.

3. In a machine according to claim 1, each roller rest being unobstructed at its exposed end and having a roller locating and pushing face at the other end.

4. In a machine for grinding rollers which are curved lengthwise, a grinding wheel having a curved profile corresponding to the curvature of the rollers, a regulating wheel having a pair of adjacent profiles corresponding to the curvature of the rollers, a work blade between the wheels, the regulating wheel and work blade being oscillatable as a unit, the work blade having a pair of roller rests confronting the adjacent profiles of the regulating wheel, and means at each side of the grinding wheel to move a new roller sidewise onto one roller rest, and the oscillating unit swinging the other rest beyond said one rest to release a finished roller therefrom.

5. In a machine for grinding rollers which are curved lengthwise, a grinding wheel having a curved profile corresponding to the curvature of the rollers, a regulating wheel having a pair of adjacent profiles corresponding to the curvature of the rollers, a work blade between the wheels, the regulating wheel and work blade being oscillatable as a unit, the work blade having a, pair of roller rests confronting the adjacent profiles of the regulating wheel, means at each side of the grinding wheel to move a new roller sidewise onto one roller rest, and a stripper carried by said means to strip a finished roller from the other rest.

6. In a machine for grinding rollers which are curved lengthwise, a grinding wheel having a curved profile corresponding to the curvature of the rollers, a regulating wheel having two intersecting profiles corresponding to the curvature of the rollers, a work blade in the throat between the wheels and having a pair of roller rests curved lengthwise to fit the curvature of the rollers, the regulating wheel and the work blade on the one hand and the grinding wheel on the other hand having relative oscillation about an axis extending through the center of curvature of the grinding wheel profile, and means at each side of the grinding wheel for removing a finished roller from one; rest and delivering a new roller to the other res 7. In a machine for grinding rollers, a grinding wheel, a regulating wheel having a pair of intersecting profiles, a pair of roller rests between the wheels and each confronting one of the profiles On the regulating wheel, means for fixing the roller rests with respect to the regulating wheel with each rest in immediate and permanent adjacence to one of said intersecting profiles, the regulating wheel and the roller rests being mounted to oscillate as a unit with respect to the grinding wheel to traverse rollers in succession across the full width of the grinding wheel in alternating directions.

8. In a machine according to claim 7, the roller rests inclining downwardly away from each other at a small angle to skew the rollers with respect to the regulating wheel.

9. In a machine for grinding rollers, a grinding wheel, a regulating wheel having a pair of intersecting profiles, a. work blade between the wheels and having a pair of roller rests each confronting one of the profiles on the regulating wheel and being fixed with respect thereto, an upstanding lug between the rests and having roller locatin and pushing faces at adjacent ends of the roller rests, the regulating wheel and blade being mounted to oscillate as a unit with respect to the grinding wheel.

10. In a machine for grinding barrel shaped rollers, a grinding wheel having a concave profile, a regulating wheel having twin profiles curved about difierent centers but having the same radius of curvature as the concave profile of the grinding wheel, twin roller rests, each confronting one of the profiles of the regulating wheel, the regulating wheel and the roller rests on the one hand and the grinding wheel on the other hand having relative oscillation around an axis, and means for loading one roller on one rest and releasing another from the other rest at the end portion of each stroke of oscillation.

11. In a machine for grinding barrel shaped rollers, a grinding wheel, a regulating wheel having a pair of intersecting profiles, a pair of roller rests in the throat between the wheels and each rest confronting one of the profiles on the regulating wheel, the regulating wheel and the roller rests being mounted to oscillate as a unit with respect to the grinding wheel to traverse rollers in succession across the grinding wheel in alternating directions, a runway at each side of the grinding throat to hold a column of rollers, and

an oscillating member movable across the run- 6 the blade with respect to the regulating wheel with each of the rests in permanent adjacence to one of said surfaces of revolution, the regulating wheel and the blade being oscillatable as a unit to carry the rollers along the entire width of the grinding wheel.

14. The method of centerless grinding rollers between a grinding wheel and a regulating wheel having two intersecting peripheral surfaces, which consists in feeding a roller radially of and into peripheral rolling contact with one of the intersecting surfaces, moving the regulating wheel and the roller as a unit in one direction to carry the roller periphery across the full width of the grinding wheel, removing the roller, feeding a second roller into peripheral rolling contact with the other intersecting surface, and moving the regulating wheel and the roller as a unit in the opposite direction to carry the second roller across the full width of the grinding wheel.

RAYMOND H. CRAMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,611,135 Sandford Dec. 14, 1926 1,654,236 Binns Dec. 27, 1927 2,156,562 Cramer May 2, 1939 2,205,468 Cramer June 25, 1940