US2277028A - Grinding machine table positioning mechanism - Google Patents

Description

March 24, 1942. H. F. WIDENER ETAL 2,277,028

GRINDING MACHINE-TABLE POSITIQNING MECHANISM I Filed Nov. 17 1941 2 sheets-sheet" 3mm H54 M F MDENER 5E UREE TML/sKaw/v March 1942- H. F. WIDENER ETAL 3 GRINDING MACHINE-TABLE POSITIONING MECHANISM ELM FMDENER EEUREETMUSKUV/N tion' of the manually operable traverse wheel 44.

A table positioning and indexing mechanism may comprise a stop dog 44 which is adjustably supported by a pair of clamping'bolts 44 and -4| in a T-slot 44 formed in the front edge of the work supporting table II. A stop block 44 is fixedly mounted on the dog 44 and is provided with a plurality of stepped stop abutments 4|, 42,

44 and 44 which are formed and face longitudinally to correspond with the shouldered portion to .be ground on the work piece II. The stop block 44 is fastened to the front face of the dog 44 by a pair of screws 44 to facilitate removal of the same when desired. A stop block 44 is provided for each different work piece to be ground and .the stepped faces thereon are accurately formed and spaced to correspond with the spacings of shouldered portions on the work piece to be ground. It will be readily apparent from the foregoing disclosure that by changing the block 44, the mechanism may be readily set up for grinding any desired shouldered type work piece having aplurality of shouldered portions thereon to be ground. A visible indicating mechanism which is arranged to aid in successively positioning the table II in predetermined grinding posi- This mechanism may comprise abracket 1 tion. 44 which is fixedly supported on the front of the machine base. The bracket 44 is provided with two upwardly extending arms 4| and 44 which serve pivotally to support a rocking plate 44. The arms 4| and 42 are provided with a pair of aligned opposed pivot screws 44 and 44, respectively. the inner ends of which are cone shaped (Fig. 2) to mate with conically shaped apertures is arranged to engage an actuating plunger 12 of the dial gauge 41. Another arm 14 of the bell crank lever I4 serves to engage the stepped stop abutment surfaces 4|. 42, 44 and 44 of the stop or positioning dogs- 44. The bell crank lever 14 is pivotally supported by means of a stud 14 which is fixedly supported on the pivotally mounted plate 44. A pair of stop screws 14 and I4 supported in bosses l1- and I4, respectively, formed integrally with the pivotally mounted plate 44 serve to limit therocking' movement of the bell crank lever 14 in either direction.

In order to accurately position the table II for grinding successive shouldered portions on the work piece II, it is desirable to provide a suitable mechanism for successively positioning the arm 14 of the bell crank lever 14 in operative position relative to stop abutments 4|, 42, 44 and 44 of the stop dog '44. .This is preferably accom- -plished by a manually operated, cam actuated mechanism comprising a cam 44 which is fixedly desired and predetermined position to locate the is provided gagement with the surface 44, the plate 44 isarm 14 of the bell crank 14 relative to the stop abutments 4|,.42, 44 and 44 of the stop dog 44. The locating surfaces of the cam 44 are arranged to engagea surface 44 formed on the under side of the pivotally mounted plate 44- In the position of the parts (Fig. 4), the cam surface 44 is operative to position the arm 14 in an operative position relative to the stop abutment 4|. After the first shoulder on the work piece ll has been ground to the desired and predetermined extent, the manually operable lever 44 is swung in a counterclockwise direction into the broken line position 44a (Fig. 4) to shift the cam 44 so .that cam face 44 engages the face 44 on the plate clockwise direction into broken line position 441) to position the cam surface 44 in engagement withthe surface 44 on the pivotally supported plate. This movement serves'to rock the plate so that the arm 14 of the bell crank lever 14 assumes position 14b (Fig. 4), in which position it lies in the path of the stop abutment 44. Similarly, when the lever 44 is again shifted in a counterclockwise direction into broken line position 440 to position the cam surface 41 in enagain rocked in a counterclockwise direction to position the arm 14 in position He so that it lies in the path of the stop abutment 44.

The mechanism above described is shown set up for hunting and determining the table position as it is moved in a direction toward the right. If desired, the mechanism may be readily set. up in a similar manner to indicate and determine table positions during its movement toward .the left. The stud 14 together with the bell crank lever 14 supported thereby may be removed from the position shown in Fig. 3 and the stud 14 inserted in a threaded aperture 44. The stop abutment plate 44 may then be interchanged with a ,plate of the proper design. The stop screw 14 may be shifted into the threaded aperture 44 formed in a boss 41 projecting upwardly from the plate 44. The screw 14 in the new position together with thescrew 14 will limit the rocking movement of the bell crank lever when set up to locate the table during a movement toward the left.

The operation of this improved table .indexing and positioning mechanism will be readily apparent from the foregoing disclosure. Assuming the parts to have been previously adjusted and the stop abutment plate 44 of the proper design for the work piece ll being ground to have been fixed in position on the dog 44 and the dog 44 adjusted to a predetermined position along the table II, and assuming the lever 44 is in the full line position (Fig. 4), the manually operable hand wheel 44 is rotated to move the table II toward the right. As the table II approaches the desired and predetermined position, the stop abutment 4| engages the arm 14 of the bell crank lever I4 and rocks the bell crank lever '|4 in a clockwise direction (Fig. 3). This movement serves to move the actuating plunger 12 of the dial indicator 41. The movement of the table II is continued until the dial indicator reads zero. namely, until the table is located precisely in the desired and predetermined position.

into broken line position 88a to swing the plate 63in a counterclockwise direction (Fig. 4) so as to position the arm 13 of the bell crank lever 18 in position 13a. The table H may then be arranged to actuate said indicator, said lever .being arranged. in" the path of one of said stop surfaces, and manually operable means sucmoved a further distance toward'the right until [the stop abutment 52 (Fig. 3) engages the arm 13 of the bell crank lever 10 and rocks it to shift the dial indicator plunger l2 until the dial indicator reads zero, in which position the work piece is precisely positioned for grinding a sec- 0nd shouldered portion on the workpiece.

After the second shoulder has been ground to the desired extent and the grinding wheel 26 has been removed to a-rearward or inoperative position, the manually operable lever 88 is again moved in a counterclockwise direction into broken line position 881) to further swing the plate 83 so that the arm 13 of the bell crank lever assumes position 73b so that it lies in the path of the stop abutment 53, in which position the third shoulder on the work piece may be ground to the desired and predetermined extent. The manually operable lever 88 may thenbeswung further in a counterclockwise direction into position 880, in which position the cam face 88 positions the rocking or pivotally mounted plate 63 in position so that the arm I3 of the bell crank lever 10 assumes position 'l3c and lies in the path of the stop abutment 54 for positioning the table in afourth predetermined position for grinding a cessively to positiods'aid member and lever in the path of successive stop'suriaces on said stop 3. In a grindingi'machine having a base and a table slidably mounted thereon, a stop adjustablymounted on one of said parts having a pin-- rality of sp'aced1stop s'surfaces, an adjustable memberon the'othr of said parts, a dial i'ndicator on said member, a lever on said member arranged toactuate said indicator, said lever being arranged in the-path'of one of said stop surfaces, and means including a cam successively to position said member and'lever in the path of successive stop surfaces'on said stop dog;

4. In a grinding 'machine having a base, a table slidably mounted thereon, an adjustable stop mounted-on one of said parts having a plurality of spaced stepped stop surfaces, a pivotally mounted platen on the other of said parts, a dial indicator on said platen, a'bell crank lever piv-' 'otally supported on said platen, one arm of said lever being. arranged to actuate said dial indicator, the other arm of said lever being arranged in the path of movement of one of said stop surfaces, and means to tilt said platen intermittently and successively to position said latter arm in the path of successive stop surfaces on said-stop dog.

5. In a grinding machine having a base and a reciprocable work supporting table mounted thereon, an adjustable stop onone of said parts having a plurality of stepped stop surfaces, a piv- -otally mounted platen on the other of said fourth shouldered portion on a work piece to the desired and predetermined extent.

As previously explained, the stop abutment plate 50 may be readily interchanged fora plate designed and made for positioning the table to grind any shouldered work piece to position the table II during its movement either toward the right or toward the left, depending upon the nature of the work piece to be ground.

It will thus be seen that therehas been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim:

1. In 'a grinding machine having a base and a table slidably mounted thereon, a stop adjustably mounted on one of said parts havinga plurality of spaced stop surfaces, an adjustable member on th other of said parts, a dial indicator on said member, a lever on said member arranged to actuate said indicator, said lever being arranged in the path of one of said stop'surfaces, and means successively to, position'said member and lever in the path of successive stop surfaces on said stop dog.

2. In a grinding machine having a base and a table slidably mounted thereon, a, stop adjustably mounted on one of said parts having a plurality of spaced stop surfaces, an adjustable member on the other of said parts, a dial indicat )l on said member, a lever on said member parts, a dial indicator on said platen, a bell crank lever pivotally supported on said platen, one arm of said lever being arranged to actuate said dial indicator, the other arm of said lever being arranged in the pathof movement of one of said stop surfaces, and means including a cam to rock said platen successively to position said latter arm of the bell crank lever in the path of successive stop surfaces on said dog.

6. In a grindingmachine having a base and a reciprocable work supporting table mounted thereon, an adjustable stop on one of said parts having-a plurality of stepped stop surfaces, a

pivotally mounted platen on the other of said platen in one of a plurality of positions, and a manually operable lever to actuate said cam.

7. In a grinding machine having a base and a reciprocable work supporting table mounted thereon, an adjustable stop on said table having a plurality of stepped stop-surfaces, a pivotally mounted platen on said base, a dial indicator on said platen, a bell crank lever pivotally supported on said platen, one arm of said lever being arranged to actuate said dial indicator, the other arm of said lever being arranged in the path of movement of one of said stopsurfaces, a rotatable cam to rock said platen, said cam being shaped to locate said platen in one of a plurality of positions, and a manually operable lever to actuate said cam.

H. FRED WIDENER. GEORGE T. MUSKOVIN.

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