US1820029A

US1820029A - External center grinder

Info

Publication number: US1820029A
Application number: US355740A
Authority: US
Inventors: Clifford T Raule
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-04-17
Filing date: 1929-04-17
Publication date: 1931-08-25
Anticipated expiration: 1948-08-25

Description

EXTERNAL CENTER GRINDER Filed April 17, 1929 2 Sheets-Sheet l V F 2 v INVENTOR. Mmf- 2g g/ 2M TPdzzZe A TTORNE Y.

Aug. 25, 1931. c. T. RAULE EXTERNAL CENTER GRINDER Filed April 17, 1929 2 Sheetg-Sheet 2 ATTORNEY INVENTOR Patented Aug. 25, 1931 PATENT OFFICE CLIFFORD '1. RAULE, OF BROOKLINE, PENNSYLVANIA EXTERNAL CENTER GRINDER Application filed April 17,

My invention relates to grinding machine for tity of like articles.

A purpose of'my invention is to use an a multiple external grinding a large quaneccentricity between the grinding disc face of a grin g wheel and the common orbit of planetary work-holders adapted to present duplicate work pieces thereto for traversing the work wheel surface.

A further purpose is to support workholders atspaced intervals around a turntable upon upwardly extending parallel links pivoted at opposite ends respectively to the work-holders and to the table and to use an radially inwardly to straighten up the supexternal cam common to all of the work-holders for feeding the work-holders upwardly against the downwardly directed face of a grinding wheel by moving the work-holders porting links of the holders.

A further purpose is to provide efiicient mechanism for automatically unloading and loading the planetary work-holders of an ex ternal grinding machine.

Further purposes will appear in the specification and in the claims. V

I have elected to show one only of the forms of my invention, selecting a form that is prac- 80 tical and efficient in operation and that illustrates volved.

Figure 1 is a broken top plan View showing structure embodying my invention.

Figure 2 is a vertical section taken upon the line 2-2 of Figure 1.

Figure 3 is a fragmentary plan view of one of the work-holders.

Figures 4 and 5 are end and side elevations, respectively, partly sectioned, of Figure 3.

Like numerals refer to like parts in all figures.

Referrin to the drawings,

particularly well the principles inand describing in illustration and not in l1mitation:

The present invention utilizes an eccentric relation between the downwardly rdirected disc face 10 of a large grinding wheel 11 and the common orbit of work-holders 12 mounted at spaced intervals around a turn-table 13 in order to produce relative traverse of pieces with respect to the.

1929. Serial No. 355,740.

the engaging surfaces of the work pieces and the wheel.

It also utilizes novel means forfeeding the work-holders toward the wheel face during grinding and novel means for loading and unloading the work-holders.

The stationary supporting structure 14 includes a base 15 and brackets 16 and 17 extending upwardly from opposite sides of the base and carrying respectively the wheel unit and a feed hopper 18.

.The grinding disc wheel is mounted in an annular casing 19 that is rigidly fastened at the lower end of a shaft 20. The shaft is journaled and supported at the inner end of abracket 21 which is supported upon the guideway bracket 16 of the supporting structure. The wheel unit is supported vertically by .a suitable pressure bearing 22 and is belt-driven at 23 from a motor 24 mounted upon the bracket 16.

The bracket 21 carrying the Wheel unit is vertically adjustable in its supporting guideway, downwardly directed screws 25 from the bottom of the bracket 21 representing heads against an upwardly directed surface 26 of 76 the supporting structure.

7 The turntable is of larger diameter than the grinding wheel andis journaled upon a central stationary post 27 extending up from the supporting structure. The grinding wheel and turn-table are relative eccentric and of different diameters, opposing one another .at one side and being relatively offset at the other, so that the radial position of each work-holder onthe, turn-table is variant with respect to the face of the grinding wheel according to its orbital position around the wheel.;

The work-holders 12 are mounted at spaced intervals around the turn-table and 80 are adapted to present work pieces againstthe grinding face of the wheel while traveling along a portion of their orbit at one side of the machine.

Each work-holder comprises a center chuck 28 supported upon four upwardly extending parallel links 29 that are pivotally connected at their upper ends to the chuck and at their lower ends to upwardly extending lugs 30 from the turntable.

The center chuck includes an outer dead center spindle 31 in a tail portion of the chuck and a co-axial live center spindle 32 in a head at the inner end of the chuck.

The dead center spindle is spring-pressed inwardly at 33 and carries a flange 31 at its outer end for use in pulling back the spindle for opening the chuck.

The live center spindle carries an offset drive pin 35 and is driven through

meshing gear wheels

36 and 37 that are preferably respectively co-axial with the upper and lower pivots of the inner pair of supporting links 29 so that angular deflection of the links may not interfere with the gear drive of the live spindle.

The chucks are spring-pulled outwardly at 38, outward movement being limited by engagement between a feed cam 39 with the ends of arms -10 projecting from the tail ends of the chucks.

The effective lengths of the arms 40 are adjustable by screwing into the chuck members.

The feed cam 39 which surrounds the turn-table simultaneously controls the inward positions of all of the chucks and along the grinding portion of the orbit progressively feeds the carriers inward so as to straighten up the links, and thereby feed the chucks and the work pieces held in the chucks upwardly.

The carriers and work-holders are duplicate and operate alike.

The individual live center spindles are driven in any suitable way and operate to rotate the work pieces by means of the offset pins 35 which enter suitable recesses 41 in the work pieces in order to rotate the work piece.

The turn-table is driven by a motor 42 mounted on the supporting structure, the shaft of the motor carrying a pinion 13 n1esh ing with external gear teeth 44 upon the outside of the table.

The live center spindles of the chuck members are rotated from individual downwardly extending shafts 45 which journal in suitable bearings 46 through the turntable, are geared at 47 to rotate the trains operating the live spindles and extend downwardly through the turn-table where they carry small gear wheels 48 meshing with stationary gear teeth 49 around a central portion 50 of the supporting structure.

The gear 47 upon the upper end of each shaft 45 is the first of a train of gears connected to drive the live center spindle of the work-holder.

The work pieces 51 are fed one after another into the successive work-holders from the mouth 52 of a rectangular tower reservoir 53.

The delivery from the supply tower is controlled by the oscillation of a rocker lever 54 carrying upper and lower links 55 and 56 that move in opposite directions in and out across the tower above and below the lowermost position of pieces. The rocker is spring-pulled at 57 to maintain it in position in which the lower link 06 is inward below the bottom work piece, blocking the piece from moving downward.

As the empty chuck members move he neath the mouth of the supply tower, the head of the chuck engages a forwardly tiaring arm 58 from the rocker deflecting the rocker against the action of the spring 57 in a way to cause the upper link 55 to move in to block the descent of the work pieces above the lowermost piece and the lower arm 56 moving out and releasing the bottom piece, letting it fall from the mouth of the tower into chuck between the live and dead centers, which at this time are spread apart to receive the new work piece.

The rocker member springs back to its initial position as soon as the turn-table carries the chuck beyond the arm 58, the upper link 55 pulling out from below the pile of work pieces, permitting their descent to the lower link 56, which has moved into blocking position before the upper link has effected its release of the upper pieces.

The dead spindle of each work holder is drawn back to release the finished work piece by an engagement between the inner face of the flange 34 and the outer face of a release cam 59.

\Vhcn thus released the work piece momentarily lies loosely upon the bed of the chuckto be pushed off an instant later by engaging a stationary downwardly extending arm 60 from the supporting structure, and falling through asuitable opening (51 in the turn-table enters a discharge chute 62 which delivers it into any suitable receptacle.

In operation the operator maintains the supply tower 53 charged with work pieces to be externally ground. These duplicate work pieces. already centered and grooved for the chucks, are delivered one after another by the rocker feed member 54 to the successive chucks as they pass beneath the mouth of the tower, the dead center spindle of each chuck being drawn back at the time the work piece is delivered into the chuck.

Following the course of a single workholder around its orbit,a-lmost immediately after the holder receives a. work piece from the mouth of the feed tower it reaches a position at which the cam 59 releases the flange 34 of the dead center spindle, and the spindle springs inwardly automatically centering the work piece, the off-set pin of the live center spindle quickly finding its groove 41 of the work piece to rotate the piece.

The supporting links 29 of the chuck are at this time inclined outwardly with a resnlt that the upper surface of the work piece is somewhat below the grinding face of the wheel.

As the turn-table revolves the work piece is brought into a position 63 at which its full length is beneath the grinding surface of the disc wheel, and the height of the wheel and the length of the feed arm 40 have preferably been so adjusted that grinding begins at about this time. i

The work piece moves gradually transversely inwardly across the disc while travelder the wheel, so that the upward feed of the work piece has ceased before the piece has begun to leave the wheel.

From the position 65 the work piece moves gradually outwardly from beneath the wheel and downwardly until at a point 66 upon the other side of the machine the chuck is opened by an engagement between the release cam 59 and the flange 34 on the outer end of the dead center spindle, the spindle being drawn back and releasing the work piece.

After release the Work piece is pushed off the chuck by the arm 60 then the empty open chuck again reaches the supply tower, completing the cycle. At the supply tower it receives a new work piece beginning a new cycle.

In view of my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others skilled in' the art, to obtain all or part of the benefits of my invention without copying the structure shown, and I, therefore, claim all such 111: so far as they fall within the reasonable spirit and scope of my invention.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a multiple external grinding machine, a disc wheel, a turn-table parallel and eccentric thereto, work-holders spaced at uniform intervals around the turn-table, parallel links supporting individual holders from the table pivoted at one end to the table and at the other to the work-holder, and a feed cam surrounding the turn-table adapted to feed the holders radially of the turn-table in order to feed the work-holders in a direction axial of the turn-table toward the face of the wheel by changing the angular position of the links.

2, In a multiple external grinding machine, a disc wheel, a turn-table parallel and eccentric thereto, chucks at spaced intervals around the turn-table having link support from the turntable and positioned with respect to the face of the wheel by the angular position of the links with respect to the tnrntable, means resiliently pressing the chucks outwardly, a feed cam surrounding the turn table and limiting the outward positionof the chucks and thereby their position with respect to the face of the wheel, and means for rotating the chucks during the rotation of the turn-table. V v

' 3. In a multiple external grinding machine, a downwardly directed disc grinding wheel, an upwardly directed turntable parallel and eccentric thereto, work-holders spaced at uniform intervals around the turntable, and parallel links supporting the individual holders from the table pivoted at one end to the table and at the other to the work-holder, in combination with gearing adapted to rotate the holder having cooperating wheels coaxial with the pivots of ne of the links.

4. In a multiple external grinding machine, a disc wheel and a turn-table parallel and eccentric thereto, in combination with work-holders spaced around the turn-table, each comprising radially spaced heads, dead and live center spindles therein, resilient means pressing the dead center spindle inwardly, means for driving the live center spindle adapted to connect the spindle with the work piece during rotation so as to drive the work piece simultaneously with the spindle, parallel upwardly extending supporting links pivoted at the upper end to the workholder and at the lower end to the table, and cam means for drawing back the dead center spindle to release the Work pieces from the holder.

5. In a multiple external grinding machine, a downwardly directed disc grinding wheel, an upwardly directed turn-table parallel and eccentric thereto, work-holders spaced around the turn-table, each including spaced heads and a dead center spindle longitudinally slidable and spring-pressed inwardly in one of the heads and each adapted to present a work piece to the disc surface of 6. In a multiple external grinding machine. a downwardly directed disc grinding wheel, an upwardly directed turn-table parallel and eccentric thereto, Work-holders spaced around the turn-table, each including spaced heads and a dead center spindle longitudinally slidable and spring-pressed inwardly in one. of the heads and each adapted to present a work piece to the disc surface of the wheel throughout a portion of the orbit of the holder, in combination with cam means mounted upon supporting structure adjacenta portion of the orbit of the holder away from the disc wheel, and adapted towithdraw the spindle to loosen the work piece from the holder, an inwardly extending member adjacent the cam adapted to engage the loosened work piece to remove it from the holder, adjacent and after the projecting member, and a one-at-a-time feed member at the mouth thereof having an operating arm engaged by the empty work-holder when the holder is in position to receive a new work piece from the tower.

CLIFFORD T. RAULE.