US2882650A

US2882650A - Size and alignment control means

Info

Publication number: US2882650A
Application number: US469732A
Authority: US
Inventors: Ralph E Price; Cass F Hurc
Original assignee: Gardner Machine Co
Current assignee: Gardner Machine Co
Priority date: 1954-11-18
Filing date: 1954-11-18
Publication date: 1959-04-21
Anticipated expiration: 1976-04-21

Description

A ril 21, 1959 R. E. PRICE ET AL SIZE AND ALIGNMENT CONTROL MEANS s Sheets-Sheet 1 Filed Nov. 18, 1954 INVENTOR RALPH 5, PRICE BY C485 F. Hup

April 21, 1959 Filed NOV. 18, 1954 R. E. PRICE ETAL 2,882,650

SIZE AND ALIGNMENT CONTROL MEANS 5 Shets-Sheet 2 IINVENTOR RALPH, EPRICE TTORN EY April 1959 -R. E. PRICE ETAL 2,882,650

SIZE AND ALIGNMENT CONTROL MEANS Filed Nov. 18, 1954 3 Sheets-Sheet 3 w INVENTOR mm E. @PIcE BY cf? J F", #0 20 surfaces. wheels do notwear uniformly there is a constant tendency 'SIZE AND ALIGNMENT CONTROL "MEANS -:Ralph E. Price, Beloit, and Cass F. EHurc, Janesville, 'Wis.,

' assignors to Gardner. Machine Company sBeloit, '-Wis.,

-a-corporation of Illinois This invention relates to disk grinders wherein both .sides of a flat Work piece areground. bypassing the work ;,piece between opposed annular faces of twoabrasive disks.

'Work pieces passing between abrasive disks are re- ;ceived at the .exit end thereof by spaced guide surfaces .which are. in alignment with. said annular abrasive sur- "faces. 'Since no two abrasive surfaces .wearat thesame rate, there is a problem involved in maintaining alignment .between said abrasive surfaces and sa1d guide sur- .'j;'faces. Wear on the abrasive disks is reflected'in the width of. the work piece emerging from between the disks andalso by the path of the work relative to ithe guide Since thegguide surfaces are fixed and since .the

for'one or 'both of the'wheel surfaces to wear in such a manner that they are. no longerin alignment with the-v guide surfaces. Furthermore, 'one of said-surfaces may be more out "of .alignmentihan the .other.

. vIt .is therefore an object of this invention v,.to. ,pr.ovide means'whereby alignment between opposed grinding. disks and work guide surfaces may be maintained.

.Afurther object is to provide gauging meansapplicable Ito oppositesides of a work pieceso' that. any changein the position of the surface of the work piece as it emerges from the grinding wheels will reflect the amount of wear on the respective wheels.

Another object is to provide means responsive to said gauges for adjusting each of the grinding wheels independently to correct any change in position of the finished work surfaces by adjusting each of the Wheels by the amount of such change.

In the drawings, Figure 1 is a front elevation of a horizontal double disk grinder.

Figure 2 is an enlarged view partly in section of a portion of the gauging device showing the adjustable mounting thereof.

Figure 3 is a diagram of the wheel feeding means and the controls therefor.

Numeral indicates the bed of the machine. Grinding wheel supports 11 and 12 are slidably mounted thereon for axial movement toward and away from one another. In this view the

grinding wheels

13 and 14 are enclosed by suitable guards through which an opening may be provided to introduce work pieces such as piston rings, into the space between said wheels. Means for conducting such work pieces through the grinding zone is disclosed in Patent 2,657,504, granted November 3, 1953.

The means for feeding said wheel supports axially toward and from one another is disclosed more or less diagrammatically in Figure 3. Only one of these means is shown in detail since the feeding mechanism for both wheels is substantially identical. This feeding mechanism consists of a feed screw rotatably mounted in a suitable manner in bed 10 and operatively engaging a nut 21 in wheel support 11. One end of said feed screw extends into a housing 22 and has a gear 23 mounted thereon. Said gear 23 is in operative engagement with a gear 24 on ...Uni.ted States Patent 0 2,882,650 Patented Apr. 2.1 "F1959 ice iffhand wheel shaft'25. .Said shaft may be rotatedmanual- Lly 'byhand wheel26or automaticallyby.meansWof a ratchet whe'elf'27 onsha'ft125. .A pawl,28 .on arrnj29; is :.rotatably.mounted also on .shaft.25. Arm .,29..is-.c,on- .nected throug'hfllinkfitl. to a piston rod '31 attachedto. a piston '32 slidably mounted in cylinder.33. ,Saidpiston .may beactuated downwardly by .fiuidunderpressureand upwardly by a spring 35. A throttle valve 34..ser.ves.:as an adjustable restrictionto controljthe rate of movement of piston .32 so that said piston need, nottravelits .com-

, vpletestroke instantly. .Il'1-lihlS 'd6VlCe the ratchet wheel 27.,is actuated by pawl '28 on.the. downward stroke-.lof

piston '32.

sociatecl parts will .be. described in .detail.

' The'air which emerges ffromnozzle .43against the work .surface is supplied throug'hflline 45 from a .unit 461.com- .s'istingofa pressure-operated element 48 which. maybe a bellows or a diaphragm. Said .unit .haselectrical. contacts 47 which ..are, actuated .by a.suitab.le change in air pressure vinresponse to achangeiin the. surface oflthe .work pieceto energize .a solenoid .50. Said solenoid. is

connected to avalve 51 whichit shifts againstspring52. to direct fluid from ,purnp 53= .throug'h .lines .54 vand.;55..a nd

throttle valve ,56 to theupperend of cylinder 33.

Guide surfaces .40 .and 41 are ,monntedin adjustable .slidesitill and filsuitably mounted .on bed,10. Said .guide .su'rfacesmay' be adjusted v.in setting up..the machine,",by adjusting screws .62 and 63 which may be rotatedmanualfly by'kno'bs-,64.-and.65.

Nozzles 42 and '43 aresupported .onparallel .leafsprings 70 and 71 which in turn are mounted on slide members 72 and 73. Said slide members are slidably mounted on guide supporting slides 60 and 61 and adjusted thereon by screws and

knobs

74 and 75. Said screws are operatively mounted in split nuts 81 having clamping screws 82 for locking screws 80 and therefore the corresponding nozzle in adjusted position.

Work W may be passed through the space between

abrasive discs

13 and 14 by any suitable carrier means. The opposed surfaces of said discs are originally positioned in alignment with the surfaces of the guide members 40 and 41. As the work emerges from the grinding discs, it passes between

air nozzles

42 and 43 which direct a flow of air against the workpiece. If the wear is uniform on both grinding discs, the emerging workpiece will eventually be oversize to the point that it will reduce the flow of air from each of said nozzles. This reduction of flow will be effective to actuate the feed piston 32 to shift the Wheel 15, and the corresponding feed piston (not shown) for actuating disc 14. If one of the discs wears more rapidly than the other, the one surface of the workpiece, as it emerges from the grinding position, will be closer to the corresponding nozzle than the other. The reduced flow from said nozzle will result in actuating the associated feed mechanism to compensate for wear on the wheel so that succeeding workpieces will pass both nozzles at the same distance. Another result of nonuniformity of wear of grinding discs is that the space between the discs gets out of alignment with the guide members 40 and 41. As indicated above, this out of alignment will cause a corresponding actuation of the feed mechanism to the proper disc to restore the condition of alignment. Thus the invention performs a dual function, maintaining correct size of work and also correct alignment between discs and guide members.

. We claim:

1. In a machine for grinding opposed parallel surfaces of a workpiece, a bed, a pair of wheel supporting means slidably mounted for axial movement on said bed, a

.grinding wheel rotatably mounted on eachof said supporting means in axially opposed relation to one another, means for moving said supporting means toward and from one another, guide means for receiving a workpiece as it passes from between said wheels, and means responsive to'variation in the position of either surface of the workpiece in relation to said guide means as the work- 7 passes from between the wheels for adjusting the corresponding supporting means to maintain alignment between said wheels and said .guide means.

2. In a machine for. grinding opposed parallel surfaces alignment between said wheels and said guide means comprising means co-operating with the ground surfaces of said workpiece for determining the relative position of said wheel surfaces and said guide means, said co-operating meansvbeing responsive to any variation from a predetermined relationship between said ground surfaces and said guide means for actuating said wheel support moving means corresponding to said out-of-relation work surface to restore said predetermined relationship. I

' 3. In a machine for grinding opposed parallel surfaces of a workpiece, a pair of wheel supporting means slidably mounted for axial movement, a grinding wheel rotatably mounted on each of said supporting means with its grinding surface in opposed relation to that of the other grinding wheel, means for moving said supporting means toward and from one another, guide means for receiving the work as it passes from between the wheels, and means responsive to variation in position of either surface of the workpiece in relation to said guide means as the work passes from between the wheels for adjusting said wheel supporting means corresponding to the out-of-position f4 work surface to restore alignment between said wheel and said guide means.

4. In a machine for grinding opposed parallel surfaces of a workpiece, a bed, a pair of wheel supporting means slidably mounted for axial movement, a grinding wheel rotatably mounted on each of said supporting means in axially opposed relation to one another, means for moving said supporting means, guide means for receiving the ground-workpiece as it passes from between the wheels and means for maintaining substantially exact alignment between said wheels and said guide means. comprising separate means co-operating with each of the ground surfaces of said workpiece for determining the relative position of said wheel surfaces and said guide means, said co-operating means being responsive to any variation from a predetermined relationship between said ground surfaces and said guide means to actuate said wheel support moving means corresponding to the out-of-position worksurface to restore said predetermined relationship.

5. A machine for grinding opposed parallel surfaces of a workpiece, a pair of wheel supporting means slidably mounted for axial movement, a grinding wheel rotatably mounted oneach of said-supporting means in axially opposed relation to one another, means for moving said supporting means toward and from one another, guide means for receiving the work as it passes from between the wheels and separate gauge meansin operative relation to each of said opposed surfaces of the workpiece for determining the position of said surfaces relative to said 'guide means as the work passes from between the wheels,

.the corresponding wheel supporting means to restore alignment between said wheels. and said guide means.

References Cited in the file of this patent UNITED STATES PATENTS