US2020547A - Grinding machine - Google Patents

Description

F. s. HAAS I 2,020,547-

GRINDING MACHINE Filed Nov. 4, 1935 2 Sheets-Sheet 2 liq .5

UNITED STATES GRINDING MACHINE Frederick S. Haas, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati, 7 Ohio, a corporation of Ohio Application November 4, 1933, Serial vNo. 696,709

3 Claims. (01. 51-237) This invention relates to improvements in tools. The invention is shown in the drawings grinding machines and particularly to improveas being applied to a grinding machine, but it is ments in work driving means, such as the headto be understood that the invention is not necesstock of a center type grinder. sarily restricted to this type of machine.

- An object of the' invention is therefore the A grinding machine in general comprises a 5.

provision of an improvedhead stock mechanism base or bed it! having formed on its upper surface for use with center type grinders and like ma- Ways H for guidinga work supporting table l2 chine tools. during its movement relative thereto. Suitable Another object of the invention is the provision mechanism is enclosed within the bed and under of an improved drive for headstocks and the like the control of the hand wheel l3 and a reversing l0 to effect the rotation of work driving spindles. lever M for controlling said reciprocating move- A further object of the invention is the proments of the table l2. The reversing lever l4 vision of an improved work rotating mechanism operates a power reversing mechanism, as is well wherein flexible transmission members are emknown, and this lever is in turn engaged by dogs ployed and. wherein friction and the like is held i5 and I6 adjustably mounted on the forward 15, to an absolute minimum, resulting in a very face of the table 52 at each end of the stroke of smooth drive. the table.

' A still further and specific object of the inven- Behind the work supporting table It the bed tion is the provision of a drive for headstocks Ill supports a grinding wheel carriage I! for and the like utilizing a plurality of flexible transmovement relative thereto and at right angles to 20 mission -rnembers and in which the tension in the direction of movement of the table l2. The said members may be readily established and any carriage ll has journaled therein a spindle to slack therein simultaneously taken up. which is secured the grinding wheel I8. Also Other objects and advantages of the present carried by the carriage ll is a wheel guard i9 invention should be readily apparent by reference which substantially encloses the grinding wheel 25 to the following specification, considered in conand confines the coolant and the like usually junction with the accompanling drawings formemployed with grinding machines. Suitable ing a part thereof and it is to be understood that mechanism is supported by the bed and under the any modifications may be made in the exact struccontrol of the hand wheel 20 for effecting the tural details there shown and described, within said movement of the carriage ll toward and 30 the scope; of the appended claims, without defrom the work supporting table l2.

OFFICEV parting from or exceeding the spirit of the in- Mounted on the table 2 at opposite ends vention. 7 thereof is a tailstock 2| and a headstock 22 re- In the drawings: Y spectively supporting and having projecting Figure 1 is a front elevation of a grinding matherefrom centers 23 and 24 which terminally chine embodying the improvements of this inengage the work, such as 25 for rotation and v ntion. operation thereon by the grinding wheel. The Figure 2 is a sectional view taken on line 2-2 tailstock 2! is of the usual construction, while the of Figure 1 headstock as shown in the drawings is of a new 40 Figure 3 is a sectional View taken on line 3-3 and novel type.

of Figure 2. The headstock 22 comprises a housing 26 hav- Figure 4 is afragmentary sectional view taken ing formed on its lower surface a way 21 enn e of Fi gaging a correspondingly formed supporting sur- Figure 5 is a fragmentary sectional view taken face on the table I2. Along the forward side, on line 55 of Figure 3. i V the housing 25 has journaled therein one or more Figure 6 is a View, partly in section and partly shafts 28, each carrying at its upper end a wrench in elevatiomshowing the invention as applied to boss 29 and at its inner end a pinion 39. The aliveor rotating spindle structure. pinion sii'is adapted to mesh with the teeth of 7 Throughout the several views of the drawings a rack 3i secured to the table l2. Rotation of similar'reference characters are employed to dethe shaft 28 therefore causes, through the pinion 50 note the same or similar parts. 3G and rack 3!, the adjustment of the headstock As was noted above, this invention pertains relative to the table l2 toward and from the primarily to work driving or rotating means which tailstock 2 I. In order to secure the headstock is generally termed a headstock when applied n difierent posit-1011s of adjustment the Said 'to grinding machines, lathes and like machine headstock carries a shaft 32 on which is loosely mounted one or more clamping dogs 33, each of which is in the form of a bell crank having one arm 35 thereof adapted to engage with a lug 3-6 projecting inwardly of the table. The other arm 37 of he dogs 33 engages with the inner end of an axially shiftable rod 38 disposed in a suitable bore formed through the housing 26. The outer end of the rod 38 contacts with a clamping screw 39 threaded into the housing 25 at the end of the clamping rod bore. From this it will be seen that actuation of the rod 38 downwardly toward the right, as seen in Figure 2',

will rotate the clamping dog 33 in a clockwise.

direction and securely clamp the headstock to the table, while reverse actuation of these partswill effect the loosening thereof.

The housing 26 is provided interiorly thereof with bearings ill and 4| for a. spindle 42. The spindle 42 carries at its inner end the center 24 and immediately behind the center, the inner race members 43 and 44 of anti-friction bearings 45 are journalled. The outer races of these hearings are carried by a driven member 41, such as a pulley or chain sprocket, the latter being shown in the drawings. The sprocket 41 is keyed or otherwise secured, as by screws or bolts 41a, to a face plate or the like 48 which provides the connection to the work so that as it is rotated the work is driven. Extending about the sprocket 41 is a chain 49 in turn trained about a pinion G integral with or secured to a second pinion or gear 5|.

As shown in the drawings, the pinion 5| is cup-shaped and has pressed or clamped into it the other races 52 of anti-friction bearings 53 and 54. The inner races 55 and 56 of these bearings are secured to a hollow stub shaft or boss 51 projecting from plate member 58. The compound pinion gear 50--5l is therefore carried by the plate 58 and the integral stub shaft or boss 51. Extending through the bore in said stub shaft or boss is a stud 59 having a head on one end thereof whereby the inner races 55 and 55 of the bearings 53 and 54 areactuated toward one another and clamped between said head 6!] and a shoulder 6| formed at the baseof the stub shaft 5?. These parts are entered through an enlarged bore 62' formed in one Wall of the housing 25. The parts are secured in position by a plurality of cap screws 63 which pass through enlarged bores 54 in the plates 58 and are threaded at 65 into the wall of the housing 26.-

Trained about the large pinion or gear 51 is a flexible member or chain 66, in turn passing around a pinion 5'5 secured to the shaft 68 of a motor orprime mover 59' mounted on the housing 22. From the foregoing it will be noted that the drive is from the motor 69 through the chain 56 to the compound gear 5i-56, then through the chain 49 to the main gear 41. It will further be noted that the compound gear 5I-50 is mounted on anti-friction bearings, as is the gear ll, thereby holding the friction in these parts to an absolute minimum and providing a drive that is really smooth. It should also be noted at this time that the assembly carried by the plate 58 and including bearings 52 and 53, gear 56 and pinion may be termed a jack shaft between the initial source of power or the motor pinion 6? and the final driven member or sprocket 4i.

By reference to Figures 3 and 5 it will be noted that considerable clearance is provided by the bore 62 through which the jack shaft assembly enters the housing 26. It will also be noted from these figures that considerable clearance is provided around the cap screws 63 which secure this assembly in position. From this it will follow that the jack shaft assembly has universal ad- 5 justrnent relative to the housing and parts carried thereby and may be readily secured in position in any desired relationship to these parts. Therefore, the slack or a suitable driving tension may be eliminated or placed simultaneously on the chains 66 and 49 or their flexible transmission members by a single adjustment of the jack shaft assembly. Also, either chain may be readily tensioned or the slack therein eliminated by an adjustment in a universal direction with respect to the remaining member, which, it is presumed at this time, is under the proper tension. It is, therefore, believed that the present invention provides a simple mechanism whereby the proper adjustment of the driving members of the headstock may be: effected and resulting in a more accurate drive to the work.

The structure shown in Figure 6 is similar in connection with the drive to that described above. Instead, however, of having the final driven member 41 secured to the face plate 48 it is secured by the key it directly to the spindle when it is desired to provide a live spindle construction.

I claim:

I. A drive mechanism for a grinding wheel spindle or the like including a driving member and a final member adapted to be driven thereby, a casing inclosing said members, and an adjustable jack shaft device carried by and projecting within the casing including a drum having a sprocket formed exteriorly thereon foroperative'connection with one of the two first named members, and having a reduced projecting sprocket portion for power transmitting connection with the other of said members, said drum being interiorly provided with an anti-friction bearing race, a stub axle projecting within the drum, anti-friction bearing members carried thereby for cooperation with the race of the drum, and means for adjustably securing the stub axle in position on the cas- 15 ing whereby proper positioning of the pair of drum sprockets may be effected with respect to the members coupled thereto.

2. A headstock spindle structure for a grinding machine or the like including a casing, a spindle projecting within the casing providing a bearing,

a driven pinion rotatable on the bearing, drive connections extending from the pinion to the interior of the casing, a pinion engaging said drive connections, a pinion drum integral with the pinion having a second pinion portion exteriorly formed thereon, a prime mover having a drive member disposed within the casing, driving connections between said casing contained portion thereof and the exterior sprocket on the drum whereby motion may be transmitted from the prime mover to the spindle pinion, and means r0- tatably supporting the drum pinion within the casing for adjustment relative to both the prime mover and the spindle pinion, the casing having an aperture to receive said means and said means including a plate portion over-lying the aperture and providing a closure therefor, said plate having enlarged fastening receiving apertures formed 70 therein, fastening devices of less size than the apertures extending therethrough for clamping the plate to the casing, whereby the plate is capable of limited adjustment with respect to the casing, and a stud projecting inwardly from the 7 plate into the casing providing a supporting bearing for the sprocket drum.

3. A headstock spindle structure for a grindingmachine or the like including a casing, a spindle projecting within the casing providing a bearing, a driven pinion rotatable on the bearing, drive connections extending from the pinion to the interior of the casing, a pinion engaging said drive connections, a. pinion drum integral with the pinion having a second pinion portion exteriorly formed thereon, a prime mover having a drive member disposed Within the casing, driving connections between said casing contained portion thereof'an-d the exterior sprocket on the drum whereby motion may be transmitted from the prime mover to the spindle pinion, means rotatably supporting the drum pinion within the easing for adjustment relative both the prime mover and the spindle pinion, the casing having an aperture to receive said means, and said means including a plate portion over-lying the aperture and providing a closure therefor, said plate having enlarged fastening receiving apertures formed therein, fastening devices of less size than the apertures extending therethrough for clamping the plate to the casing, whereby the plate is capable of limited adjustment with respect to the casing, a stud projecting inwardly from the plate into the casing providing a supporting bearing for 10 the sprocket drum, anti-friction bearings interposed between the sprocket drum and the stud to facilitate free rotative movement of the former, and a securing member inter-engaged with said bearings and projecting outwardly through the 15 stud for locking the parts against axial displacement.

FREDERICK S. I-IAAS.

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