US2432765A

US2432765A - Grinding machine

Info

Publication number: US2432765A
Application number: US631379A
Authority: US
Inventors: John J Keller; Lober Konrad
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-11-28
Filing date: 1945-11-28
Publication date: 1947-12-16
Anticipated expiration: 1964-12-16

Description

Dec. 16, 1.947..

J. J. KELLER Er AL GRINDING MACHINE s sheets-shea 1 Filed Nov. 28, 1945 INVENTORS' JOHN J KELLER, d fromm/)Lome i BY Dec. 1 6, 1947. .1. J. KELLER ETAL v 2,432,765

GRINDING MACHINE l Filed Ngv. 28, 1945 s-sheets-sheet 2 Z6 P* l /72 'lr-29 5 fr Z5 ze ZZ. 5a

Dec- 16 1947 J. J. KELLER ITAL A 2,432,765

GRINDING MACHINE Filed Nov. 28,' 1945 3 sheets-sheet s Patented Dec. 16, 1947 UNITED' STATES PATENT UFFICE GRINDING MACHINE John- .L4 Keller, Hauppauge,- and Konrad Lober, ,Woodhavem N. Y.

Application November 28, 1945, Serial- No. 631,379

6 Claims. 1

This invention relates to grinding. machines and in particular to a type that is particularly adapted to the grinding and shapingv oi cork articles; l

An object ofthe inventio it is to produce a compact machine wherein the arti-cles to be shaped are fed to the machine and advance continuously from one position or station to another to provide an output that is at maximum quantity consistent with. good grinding work and one to which the ar'- ticles or rough blanks may be fed either manually or mechanically and `can be removed from the machine in the same Way without the necessity of slackening the production speed of the machine.

A further object of the invention is to provide means for rough grinding. and then iinish grinding without the necessity of feeding each blank to the grinding wheels as separate operations, it being our purpose to advance the work orbitaliy and cause the grinding wheels to engage the work as the'latter revolves axially' so that saving in time is accomplished, the machine operation is purely automatic and the production is continuous.

A still further object ofthe invention is to provide a machine in which the grinders are not only1 fed to the work, but one in which said grinders may be individually adjusted in their feed movements to adapt them to various sizesof grinding jobs, thereby making the machine adjustable to accommodate various sizes and shapes or work'. Other features of construction includel variable sizes of Work removing means into which the work passes to be drawn from the machine.

Other objects of the invention are to provide a simplied drive mechanism for operating the work carrier and the individual Work holders sov that the latter travel in an orbit while having axial rotation, the latter of which only takes place while the Work is in the grinding Zone; to providey a sturdy construction that can be readily adjusted and one in. which a maximum amount of work in various shapes and sizes may be turned out to constitute what amounts to a universal grinding machine,

With these and other objects in view, the in'- vention comprises certain constructions hereinafter described. and then particularly pointed out in the claims and a preferred embodiment of my invention is illustrated in the accompanying drawings, in which:

Figure 1 is a top plan View of a machine constructed in accordance with our invention showing the relative position ofthe parts,

Y Figure 2 is a view in side elevation of the machine shown in Figure 1,

Figure 3 is an end elevation of the machine shown in Figure 1, the view being taken looking toward the left end of Figure 2,

Figure 4 is a fragmentary detail in end eleva- 2" tion of the work advancing means as seen when viewed from the left of Figure 3,

Figure 5 is a section on the line 5-5 of Figure 2 showing the grinding wheel supports,

Figure 6 is a diagrammatic View of the work holder showing the progress of the work from the point of `feed to the point of discharge,

Figure 7 is an enlarged section taken on the line 'I--T of Figure 2 showing the work positioning and discharging members,

Figure 8` is a View in perspective, a part being broken away, of the work removing claw member,

Figure 9 is an enlarged section on the line 9 9 of Figure 2' showing the work spindle supporting mandrels,

Figure 10 is an enlarged section on ,the line IIII-III of Figure 9 showing the work mandrel holding means, and

Figure 11 is a fragmentary detail view in side elavation of the cams used to actuate the grinder in rocking motion,

Referring to the drawings in detail, I5 indicates the top of a frame I6 in which the machine is mounted. Journal brackets IIv support the work carrier Shaft ISA upon which is mounted` spaced disk plates i8 separated by the spacing sleeves IS intermediate which are held the pulleys located midway between the plates I8, and iastened in any suitable manner to the Shanks 2l of' fiuted work supporting spindles 22, the latter of which project from one face of the plate IB toward the observer looking at Figure 2. The spindles are arranged peripherally about the edge of the plate I8 and as the plate revolves, by means later to be described, they have an orbital travel and rotate `axially through the drive of .the pulleys 2G which are engaged by the drive belt 23 only at one side of the shaft I8 so that the spindles as they rotate in clockwise direction in their orbit willV be axially rotated by the belt 23 in a section designated as the working area or grinding Zone. The belt 23 passes over the upper and lower pulleys 24 fixed to stub shafts 35 in a bracket 2S, the lower shaft 26 having an added pulley Z'I which is connected for drive through a pulley 28 and belt 29 with a driven oountershaft 30, The pulley 28 is disposed on the shaft 3U beneath the table top, the belt 29 operating through a suitable opening in the top, from which the shaft 30 is suspended in the brackets 3 I.

The drive pulley 28 and countershaft are oper-` ated by a motor 32 whose shaft 33 is connected for drive to shaft 3l) through worm 34, worm wheel t5, cross shaft 3S and bevel gearing 3l,

the parts being hereafter referred to as a driving train of parts. The shaftv dii also carries an outer pulley wheel 38 the driving effort of which is transferred to the pulley wheel 4U through the medium of belts 4I and d2 and an intermediate speed regulating device 44 of well known con? struction. The adjustable speed jack 44 is mounted in a bracket 45 and the latter is extended to provide bearings for a shaft 46 upon which said pulley 40 is xed and a gear shaft or cam shaft 41, which through a gear 48 and pinion 49 is actuated from the shaft 41.

'Ihe shaft 41 carries adjacent the center of the machine, spaced

cams

50 and 5| and at one end a bevel gear 52 for the operation of an obliquely disposed shaft 53 through a pinion 54. Said shaft 53 carries a cam 55 the purpose of which will be later described, and at its upper end a pinion 56 which operates a bevel gear 51 secured to the end of a cam stud shaft 58 journalled in a bracket 59 which also has journalled therein one end of work carrier shaft I 8. Shaft I8 carries a Geneva wheel 60 having a pin socket 6I for each of the spindles on the work carrier plates I8, whereby with each rotation of the stud shaft 58, a pin 62 mounted in a disk 63 carried on said shaft will engage a socket of the Geneva wheel and rotate the work carrier to advance the work one increment which as illustrated herein happens to be one eighth the circumference of the carrier. In this manner, the work carrier plates I8, referred to for convenience as the work carrier (Figure 6), advances from station I where the blank cork W is impaled on a spindle 22 to station 2 where the blank is pressed home on the spindle by a mechanical device to be later described, then to stations 3 and 4, at the latter of which the blank receives its rst or rough grinding, then to stations and 6 at the latter of which fine or finish grinding occurs, then to stations 1 and 8 at the latter of which the finished article is drawn from the spindle by means to be later described and dropped into a receptacle or onto a conveyor as desired.

The grinding is accomplished by the use of a rough grinding wheel 65 and a fine grinding wheel 66. Each wheel is mounted in a rocker, the upper or coarse wheel 65 being carried on a shaft 61 journalled in bearings 68 secured to the plate portions 69 of the upper rocker 10, whose sleeve swings on the upper shaft 1I when a rearwardly extending rock arm 12 is oscillated by the raising and lowering action of cam 5| (Figs. 2 and 11) transmitted to said rock arm through a cam roller carrying bar 13 mounted for vertical sliding movement in a slide bracket 14 on the table top, and connected to said rock arm b-y an adjustable link 15. The finish or lower grinding wheel 66 is carried on a shaft 16 journalled in bearings 11 secured to the plate portions 18 of a lower rocker 19 whose sleeved portion 80 swings on a lower shaft 8 I, which with shaft 1I is mounted in brackets 82 presenting plate portions 83 in which

pulley shafts

84 and 85 are mounted. The grinding Wheel is advanced and retracted with respect to the work in the same manner as is the upper wheel, when a rock arm 86 extending from said sleeve 80 is oscillated by the raising and lowering action of a cam 50 transmitted to said rock arm through a cam roller carrying arm 81 mounted for vertical sliding movement in a slide bracket 88 on the frame top I5 and connected to the rock arm 86 by an adjustable link 89. The grinding wheels are driven by an upper belt 90 and a lower belt 9| from

belt wheels

92, 93 mounted on countershaft 94 supported on the brackets 95 at the rear of the machine looking from the feed end. The

wheels

92, 93 are driven from the motor shaft 33 through a belt 96 operating a drive pulley 91 fixed to shaft 94. The upper belt 90 passes about pulley 92, beneath pulley 98 on shaft 85 and around pulley 99 on shaft 61. The lower belt 9| passes about pulley 93, over the pulley |00, on shaft 84 and around a pulley |0| on shaft 16, to drive the grinding wheel 66.

As the movement of the work carrier is intermittent, the operation of all of the cooperating parts is synchronised with the movement of the carrier and at station I during the dwell between advance movements of the carrier, the operator presses a cork blank against the sharp end of the spindle and the latter is supported thereon. The spindle coming from station 8 is empty, the finished article having been taken from the spindle by a claw member |02 of U-shape fixed on the end of a slide bar |03 and presenting at the outer free ends of the member |02, the adjustable tongue pieces |04 which may be adjusted through the screw and slot connection |05 to engage work of varying dimensions in a withdrawing movement to pull the work from the spindle.

When the new work reaches station 2, it is pressed fully onto the spindle by a pusher |06 whose threaded shank |01 affords adjustment of the pusher relatively to the slide bar |08 which carries said pusher or work positioner. Both slide bars |03 and |88 are mounted for reciprocatory movement in guides I 99 of a bracket I I 0 mounted on the machine top I5. Both slide bars are connected by a lever I plvoted intermediate the bars as at ||2 to the bracket and the lower bar |08 where it is connected to the lever is also pivoted as at ||3 to an operating lever ||4 connected by a link ||5 to the end of a cam bar IIS which slides in a rest I I1 and is actuated by a cam end I I8 carrying a cam ro-ller I I9 in engagement with the cams 58A which latter imparts one reciprocation to the slide cam bar ||6 at each revolution of the shaft 58. Through this med'ium, the upper and lower slides |03, |08 are reciprocated, the upper one to push the work completely onto the spindle and then retract and the lower one to cause the claw to retract to pull the finished article off spindle station 8 and then advance as the pusher retracts. Grinding occurs at

stations

4 and 6 and the pressure of the grinders on the work might result in the breaking off of the spindles and to steady the work and true it as well as prevent breakage of the spindles, use is made of upper and lower chucks |28 both of which are alike in construction and are shown in Figure 10. Each chuck |20 consists of a body portion |2I and a rotary cap |22 separated by a roller bearing, the cap and body being bored as at |23 to receive the sharp end of the spindle and form a journal therefore. The body forms one end of a shank |24 which passes through a flanged bushing |25 fast in a bracket plate |26 attached to the journal bracket I1. The shank is shouldered as at |21 to abut the face of a presser plate |28 and is surrounded by a spring which extends from the end of the bushing |25 to the plate |28, the spring |29 tending to retract the shank and the chuck, the shank being attached to the presser plate |28 by the threaded stud end |30 of the shank |28 and a nut |3I. The chucks are fed toward the spindles by pressure applied to the presser plate by a roller |32 carried on a presser arm |33 pivoted at one end to an ear of the bracket plate indicated as at |34. The depending lever arm |33 has pin and slot connection as at |35 to a cross slide bar |36 which rests in suitable supports |38 and is actuated by a cam link |39 carrying a cam roller |40 in engagement with the cam 55 which imparts one reciprocation to the bar |36 with each revolution of the shaft 53. During the grinding operations the spindles are thus effectively supported.

The adjusting links i5 and 89 can be manipulated to adjust the throw of the wheels individually so that the depth of grind can be closely controlled. The advantage gained in the structure set forth is in bringing the rotating work. orbitally to the grinding wheels and bringing the grinding Wheels also to the work so that the work and the wheels are rotating at high speed and the grinding is quickly performed both in making the rough grind and the iinish grind, the work moves continuously from one station to another and progresses intermittently through the machine so that there is a steady output. If desired means may be used to feed the blanks to the starting point station I mechanically and position them automatically so that they will be ready for mounting on the spindles without the attention of an operator.

Our invention is not to be restricted to the precise details of construction shown since various changes and modifications may be made therein without departing from the scope of the invention or sacricing the advantages to be derived from its use.

What we claim is:

1. In a grinding machine, in combination, a work holder presenting a plurality of pulley bearing spindles upon which the work is positioned, means for moving the holder to bring the spindles successively to position the work for grinding, means for rotating the spindles as they reach grinding position including a constantly operating belt with which the pulleys of said spindles have driving contact when the spindles are at grinding position, grinding wheels, and rockers for moving the wheels toward and away from the work for engaging the latter during rotation of the spindles at successive grinding stations simultaneously.

2. In a grinding machine, in combination, a Work holder presenting a plurality of pulley bearing spindles upon which the work is positioned, means for moving the holder to bring the spindles successively to position the work for grinding, means for rotating the spindles as they reach grinding position including a constantly operating belt with which the pulleys of said spindles have driving contact when the spindles are at grinding position, grinding wheels, rocking means for moving the grinding wheels into and out of contact with the work at a plurality of successive grinding stations simultaneously when the work is in grinding position, and means for supporting the free ends of said spindles during the grinding operations.

3. In a grinding machine, in combination, a work holder including spindles arranged in circular order, means for moving the holder to bring the spindles successively to Work receiving, work grinding and work discharge positions, means for forcing the Work onto a spindle at the feed positions, means including rock arms and wheels carried by said arms for grinding the work at a plurality of grinding positions simultaneously, retractable means for engaging and supporting the ends of said spindles at each of said grinding positions and means for removing the work from the spindle at the work discharge position.

4. In a grinding machine, in combination, a work holder including spindles arranged in circular order, means for moving the holder to bring the spindles successively to a work receiving position, a plurality of work grinding positions and a work discharge position, means for impaling the work on a spindle at the feed position, means for grinding the work at the grinding po-sition, retractable means movable to engage and support said spindles at said grinding posiitons, means for removing the work from the spindles at the work discharge position, and operating means associated with said work forcing and said work removing means whereby the work is impaled on one spindle as it is removed from another spindle.

5. In a grinding machine, in combination, a work carrier including work supporting spindles, means for moving the carrier to bring the work on the spindles successively to diierent grinding stations, grinding wheels, means for moving said wheels toward and away from the work including rockers and cam actuated arms for oscillating the rockers, means for individually adjusting said arms for varying the amount of movement of each of said wheels toward and away from the work whereby the depth of the grinding action can be closely controlled and retractable means for engaging and supportingthe outer ends of said spindles during the grinding action.

6. In a grinding machine, in combination, a work carrier including work supporting spindles, means for moving the carrier to advance the work successively from a feed to grinding and discharge stations, means for positioning the work on the spindles at the feed, station, means for grinding the work at a grinding station, means for removing the ground work at the discharge station, said work removing means comprising a claw member through which the spindles may pass to position the work within the claw, and tongues on the said claw member for engaging the work and removing the same from the spindle and means for adjusting said tongues to accommodate the claw member to work of varying s1ze.

JOHN J. KELLER. KONRAD LOBER.

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

UNITED STATES PATENTS Number Name Date 2,003,269 Arter et al May 28, 1935 2,082,020 Moon June 1, 1937 1,762,681 Di Bono June 10, 1930 1,898,648 Thorsen et al Feb. 21, 1933 2,145,310 Lewis et al Jan. 31, 1939 2,177,898 Leguillon Oct. 31, 1939 2,272,055 Carlson Feb. 3, 1942 2,109,600 Vanderbeek Mar. 1, 1938