US1624642A - Grinding machine - Google Patents

Description

Y l 624,642 April 12 1927 A. vUlLLEUMn-:R y

GRINDING MACHINE Filed May 16. 1923 Patented Apr. 12, 1927.

PATENT OFFICE.

.ALBERT VUILLEUMIER, 0F BRISTOL, CONNECTICUT, ASSIGNOR T0 THE NEW D- PARTURE MANUFACTURING COMPANY, 0F BRISTOL, CONNECTICUT, A CORPORA- TION OF CONNECTICUT.

GRINDING MACHINE.

Application filed May 16,

This invention relates to grinding machines and is herein shown as embodied in a machine for grinding` balls. l

In machines of this class it has been customary to employ grinding discs having Y grooves in which the' balls are received and ground. Naturally, in such machines, the grooves wear deeper as the discs are continued in use, so that it has been necessary to stop the operation of the machine from time to time and dress down the faces of the'ribs at the sides of the grooves in order to prevent the grooves becoming so deep that they perform little or no grinding. The

discs are heavy and their separation for the` purpose of subjecting them to the action of suitable dressing tools is laborious anda source of delay and expense.

An object of the invention, therefore, is to provide means for effecting the dressing of abrading discs with a minimum amount of labor, delay -and expense. A further object is to provide improved means for effecting the dressing operation on a ball grinder without disassembling the parts of the grinder. Still another object is to provide improved means for effecting the dressing operation without the necessity for using an special dressing or truing tools.

.n the illustratedv construction, a lixed disc and a rotary disc having cooperating ball grooves are provided and provision is made for moving one of the discs into engagement with the other so that the mutual rubbing effects the truing operation. Preferably, one of the discs has a bearing in an eccentric bushing by means of which it can be moved out of axial alignment with the of the ribs with one another is a. combined lengthwise and crosswise rubbing such that the ribs are accurately re-surfaced.

To these ends and also to improve .generall upon devices of the character indicate my invention consists in the various matters hereinafter described and claimed.

Referring to the drawings, Figure 1 is a which is held against rotation in a suitable standard. The disclO has a plurality of 1923. serial No. 639,227.

concentric ball grooves 14 between which lie the intervening ribs or lands 16. An abrasive disc or ring 18 having corresponding ball grooves and intervening ribs is detachably carried by the circular plate 20, the hub of which, as shown at 22, is threaded onto the cnd of a hollow spindle 24, driven by the pulley 26 which is keyed to the spindle as indicated at 28.

A Surrounding the spindle are the single row bearmg and the double row bearing' 30 and 32, respectively` these being spaced by t-he.sleeve 34. The bearings are mounted in an'eccentric bushing .36 which is turnably carried by the standard or frame 38, a ange 40 on the bushing extending outwardly and limiting the movement of the bushing in one direction. A plate 42 attached tothe other end vof the bushing 36 prevents its axial Amovement in the other direction.

When the balls are in rocess of being ground, the parts are in t e relative positions lndlc'ated in the drawings. When the ribs are to be rie-surfaced, the disc 18 isv engaged by a worm 46 carried by a horin zontal shaft r48 journaled in the standard and having a hand wheel 50 by which it may be turned.v The normal alignment of the discs is preserved by means of a locking wedge and notch shown best in Figure 2.

- The notch 52 has inclined sides arranged l other disc.. Consequently, the engagement* to t the inclined sides of the wedge 54 40 Vand loosely connected to the wedge bymeans' of a collar 60 set into-a circular recess in the wedge. This wedge insures the re-positioning of the discs in accurate axial alignment after the facing or truing operation.

The disc 10, which is held against rotation, engages the balls yieldingly during the grinding operation. For .this purpose a coil spring 62,is placed inside the Isleeve 64 of the plate 12 and is interposed between the plate and an abutment (not shown) at the los `operation is performed.

other end of a rod 66. The rod 66 holds the discs against separation and passes through the hollow spindle 24, a nut 68 and washer 70 being fixed to one end. Upon removal of the `nut and washer, the shaft 66 is removable endwise through the discsfor the purpose of allowing the necessary lateral movement of 'the disc 18 when the truing In vsome cases, enough clearance may be left between the rod 66 and the spindle 24; to allow the lateral movement without removing the rod. To provide a yieldingA engagement between the discs durin the truing or dressing o eration, the fo lowing mechanism is provlded for constantly pressing the disc 10 against its companion disc. vRack teeth 72 are formed on the hub sleeve 64 and are engaged by a pinion 74, the shaft of which may be squared to receive an arm 7 6 and the arm is yieldingly pulled in one direction by a spring 7 8 fixed to the end of the arm and t0 a fixed part of the frame. A

It is believed that the operation of the device is clearly apparent from the above description. Although the invention has been described and claimed by referring to a specific machine, it should be understood, that, in its broader aspects, the invention is not necessarily limited to the apparatus selected for illustration.

I claim:

1. In a ball grinding machine, in combination, a disc, means for rotating the disc, a second dise held against rotation, one of said discs having ball grooves with intervening ribs, and means for relatively moving the discs to cause one disc to engage the ribs on the other for dressing the latter, sub stantially as described.

2. In a ball grinding machine, in combination, a disc having ball grooves with intervening ribs, a second disc having similar ball grooves with intervening ribs, means for causing a relative rotary movement between the discs to grind the work, and means for4 relatively displacing the discs to cause the ribs of one disc to engage with the ribs of the other for dressing the latter, substantially as described.

3. In a ball grinding machine, in combination,'a disc' having concentric ball grooves with intervening ribs, a second ,disc in axial alignment with the first and having similar ball grooves with intervening ribs, means for rotating one of the .discs to grind the work, and means for moving one of the discs out of axial alignment with the other to cause the ribs on the two discs to mutually cross each other, substantially as described.

4. In a ball grinding machine, in combination, a disc having ball grooves with intervening ribs, a second disc having similar ball grooves with intervening ribs, means for rotating one of the discs togrind the work, and an eccentric sleeve furnishing a laterally movable support for one of said discs, substantially as described.

5. In a ball grinding machine, in combination, a .disc having ball grooves with intervening ribs, a second disc having similar ball grooves with intervening ribs, means for rotating one of the discs to grind thev work, a support for one of said discs, and means for laterally moving said support, substantially as described.

6. In a ball grinding machine, in combination, a disc having ball grooves with intervening ribs, a second disc having similar ball grooves with intervening ribs, means for rotating one of the discs to grind the work, an eccentric sleeve furnishing a laterally movablev support for one of said discs, means for turning said sleeve, and means for locking said sleeve in normal position.

7 In a ball grinding machine, in combination, a disc having ball grooves with intervening ribs, a second disc having similar ball grooves with intervening ribs, means for` rotating one of the discs, a spring for yieldingly pressing the work between the discs, and a second spring for yieldingly pressin one of the discs against the other to grin one disc by contactwith the other, substantially as described.

8. In a grinding machine, in combination, a disc, means for rotating the disc, a cooperating non-rotary disc, means for yieldingly pressing one of said discs against the other for grindingone disc by contact with the other, and independent means for yieldingly pressing the workbetween the discs, substantially as described.

9. In a grinding machine, in combination, a disc havlng concentric grooves, means for rotating the disc, a cooperating disc held against rotation, a rack and pinion for sliding said last named disc towards the other disc, and yielding mean-s tending to turn the\ pinion to effect a grinding contact betweenl the disks, substantially as described.

In testimony whereof I hereunto aiiix my signature.

ALBERT VUILLEUMIER.

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