US1881244A - Multiple grinder - Google Patents

Description

Patented Oct. 4, 1932,

lUNrrED STATES CLIFFORD T. BAULE, F BBOOKLINE, PENNSYLVANIA MULTIPLE GRINDER Application led March 1,

My invention relates to multiple spindle internal grinders for use in grinding duplicate parts to finish size.

A purpose of my invention is to mount work-holders at uniform intervals around an intermittently movable turn-table, and to mount grinding Wheel units upon stationary supporting structure in position to operate successively upon the Work pieces during the' periods of rest of the table, preferably operating upon the different work pieces simultaneously at the diiferent Wheel units while the work-table is stationary and preferably accommodating the character of the successive wheel units to the successive phases of grinding'.

Further purposes will appear in the speciication and in the claims.

I have elected to show one only of the different forms ofmy invention, selecting a form that is practical and efficient in operation and which well illustrates the principles involved.

Figure 1 is a fragmentary top plan view of structure embodying my invention.

Figure 2 is a vertical section through Figure 1.

Figure 3 is a detail section taken upon the line 3 3. of Figure 2.

Like numerals refer to like parts in both tigures.

Describing in illustration and not in limitation, and referring to the drawing t My invention contemplates internal finish grinding of duplicate parts.

I mount work-holders at spaced intervals around a turn-table adapted to intermittent movement, and place grinding units in position around the turn-table to operate simultaneously upon the work pieces in the different holders and preferably accommodate the character of the wheel of the units to the phase of cutting. The work pieces thus move intermittently along Va, common orbit, the

` grinding operation taking place during rest periods at the different holders simultaneously, and on each piece successively at the different wheel units.

The work-holders 5 are spaced at uniform intervals around the turn-table 6. Within 1929. Serial No. 343,609.

the workholder is an abutment in the form of an upwardly facing rim 5 upon which the lower end of the work circumferentially rests. The turn-table is journaled .upon a stationary central post 7' of the supportingv structure 8 and is driven intermittently by cooperating engagement between the roller 9 upon the end of a revolving crank 10 and the successive teeth of a star Wheel 1l rigidly carried upon the hub 12 of the turn-table.

-The shaft 13 carrying the crank 10 operating the turn-table is one of a number of similar shafts 14 that are individual to the different wheel units 15. They have bearings in the stationary supporting structure at 16 and 17 and carry gears 18 meshing with a large gear 19 upon a shaft 20 that has continuous worm drive at 21 from aA suitable motor 22.

Each wheel unit is mounted upon and adjustable along the horizontal guide 23 of a carrier member 24. The carrier 24 is adapted to vertical movement up and down a vertical guideway 25 and is vertically positioned along its guideway by the vertical reciprocation of a supporting rod 26.

The rod 26 is suitably guided at 27, fastened to the carrier at 28 and is vertically reciprocated by the small and large eccentrics 29 and 30 which aredriven fromthe shaft 14 of the wheel unit.

The shaft 14 is geared at 31 to slowly ro- Y tate a shaft 32 carrying the large eccentric 30 thelatter shaft being geared at 33 and 34 to fairly rapidly rotate a shaft 35 carrying the small eccentric 29.

The rods 26 are given a conformation adapting them to be simultaneously vertically reciprocated-'by the more rapidly revolving small eccentrics 29 for traverse grinding during rest periods and then to be simultaneously raised by the larger eccentrics away from the smaller eccentrics in order to lift the Wheels away from the respective work pieces preparatory to advancing the turn-table.

Preferably the throw of the'eccentric 30 is such as to raise the carrier not only out of the work piece but a sufficiently additional distance to move the wheel face acrosslthe point of a truing diamond 36.

vThe wheel units are adapted to screw adjustment along the horizontal guideways 23 at the hand-wheels 36 and at periodic intervals an operator makes a small feed toward the diamond while the Wheel is raised above the diamond, so that when the wheel descends into the new work piece it is trued up by passing across the diamond.

By the time the crank l0 has moved the work-table to a new position the eccentric 30 is on its way down and moving the wheel unit down across the diamond and the downward motion continues until after the wheel has somewhat entered the work piece when'the rod 26 engages the smaller and more rapidly revolving eccentric 29 which then traverses the unit up and down during grinding.

The wheel units are provided with individual motors 37 which may be connected directly to the spindles of the individual wheels.

The work-holders are illustrated as driven by motors 38 rigidly mounted upon the lower side of the work-table and connected by pulley 39 and belt 40 tothe driving surface 41 of the holder. Each work-holder is thus rotated by its own motor.

I illustrate the diamond 36 mounted above the outer side of the work pieces. In this case the Wheel engages the work piece along the outer side of its interior, the feed of the wheel preparatory to diamonding being thus outwardly away from the axis of rotation of the turn-table.

Optionally the feed may be inwardly toward the axis of rotation of the turn-table and in this event the diamond must be supported above the inner side of the work piece interior.

The latter construction is somewhat disadvantageous in vthat the diamond supporting brackets 42 must vbe longer and lie in a position less convenient for the operator to make adjustments.

Preferably suitable means is provided for exactly registering the work-table in its successive positions of rest at which the grinding operations take place.

' As illustrated in the figure beveled recesses 43 are made at uniform intervals around the periphery of the turn-table and these recesses register successively with the beveled end of a plunger 44 spring-pressed inwardly from inside an inwardly directed bore 45 in the stationary supporting structure.

The plunger 44 is spring-pressed inwardly into the registering recess 43 with sufficient strength to exactly register the turn-table with the plunger which should closely fit its casing 45 in the supporting structure.

The character of the Wheels both with respect to the grain of the abrasive and to the speed of drive may desirably vary at differentwheel units to accommodate the progressively different duties of the `wheels due to the phases of the grinding operation being progressively different.

In the illustration the work pieces are loaded at the first position of rest. At the second position of rest the first cutis made, the characteristics of the first Wheel desirably being Such as to permit heavy rapid cutting.

After the second station the wheels may make successively finer cuts anddesirably the last internal wheel 46 will be run at a reduced speed for polishing and the next position after that for polishing is used for applying a facing Wheel 47, traversed horizontally across the upwardly projecting end 48 of the successive work pieces.

The wheelunit 47 is mounted upon a horizontal stationary and preferably vertically adjustable guideway v49 along which it is adapted to traverse and the movements to and from grinding position areei'ected in the same general Way as the vertical movements for the other grinding wheel units except that the vertical movement of the rod 26 is converted into horizontal movement by a suitable bell crank 50 pivoted at 51 to horizontal guideway structure and having slot and pin connection52 with the wheel unit.

` .At the next andlast position of rest the work piece is discharged in any suitable Way, as by means of a plunger coming up from below, lifting the piece between upwardly swinging doors 53 and leaving it supported upon these doors when the plunger goes down again out of the way before the next forward movement of the turn-table.

It will be noted that the same operations take place at the same given position around Athe supporting structure. The pieces are loaded at the first position only, rough cut at the second position, given successively finer cuts at succeeding positions before the polish- .ing position, polished at the polishing position and faced and discharged respectively at the facing and discharging positions.

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 in so far as they fall within the reasonable spirit and scope'of my invention. y

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a multiple internal grinding machine, stationary supporting structure, a turntable pivotally mounted thereon, work-holders mounted at uniformly spaced intervals around the table, said work-holders each presenting an abutment to the inner end of the work-piece and circumferentially engaging the work-piece, and the abutment faces presented to the inner ends of the work-pieces all moving in the same orbital plane, mechanism adapted to give the table an intermittent forward rotary movement such that the workholders come to rest one after another at the same positions, and a plurality of internal grinding units and a facing grinding unit, said units being mounted upon the stationary structure at each one of a succession of the positions of rest and each adapted to operate during successive rest periods of the turntable upon work pieces in the successive Workholders, the facing grinding unit in cooperation with the abutments grinding the workpiece to the same definite length, the said facing grinding unit including a stationary guideway perpendicular to the a-Xis of rotation of the turn-table, a grinding wheel unit slidably supported in the guideway and adapted to operate during each rest period of the table and cam means synchronized with the operation of the turn-table for moving the wheel unit into operating position after the turn-table comes to rest to traverse the unit during the rest period and to remove the unit from its operating position preparatory to each forward mov-ement of the table.

2. In a multiple internal grinding machine, stationary supporting structure, a

. turn-table pivotally mounted thereon, Workholders mounted at uniformly spaced intervals around the table, mechanism adapted to give the table intermittent forward rotary movements such that the work-holders come to rest one after another at the same positions, a plurality of stationary guideways parallel to the aXis of rotation of the turntable and mounted upon the stationary structure near successivo positions of rest of the work-holders, a grinding wheel unit slidably supported in each guideway and adapted to operate during rest periods of the table upon work pieces in the adjacent holders and cam means synchronized with the operation of the turn-table for moving the wheel units into operating position after the turn-table comes to rest, to traverse the unit during the rest period and to remove the unit from its operating position preparatory to each forward movement of the table.

3. In a multiple internal grinding machine,

stationary supporting structure, a turn-table' pivotally mounted thereon, work-holders mounted at uniformly spaced intervals around the table, mechanism adapted to give the table intermittent forward rotary movements such that the Work-holders come to rest one after another at the same positions, a plurality of stationary uideways parallel to the axis of rotation o? the turn-table and mounted upon the stationary structure near successivel ositions of rest, a grinding wheel unit slidab y supported in each guideway and adapted to operate upon work pieces in the adjacent holders, means synchronized with the operation of the turn-table for moving the wheel units into operating position after the turn-table comes to rest, to traverse the unit during the rest period and to remove the Aunit from its operating position preparatory

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