US727033A - Grinding-machine. - Google Patents

Description

"no. 727,033. PATENTED MATY 5.19 03.

Z. R. TUCKER. GRINDING MACHINE.

urmonxon FILED r1112. 5. 1902.

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No. 727,033. PATENTED MAY 5,1909

I Z. R. TUCKER.

GRINDING MACHINE.

, APPLICATION FILED FEB. 5. 1902. 110 MODEL.

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mvEmon WITNESSES: I I X i! I W ATTORNE J UNITED TATES Patented May 5, 1903.

ATENT FFICE.

ZECHARIAH RHODES TUCKER, PROVIDENCE, RHODE ISLAND, ASSIGNOR TO UNIVERSAL MACHINE COMPANY, OF PROVIDENCE, RHODE ISLAND, A CORPORATION OF RHODE ISLAND.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 7 7, dated M y 1903- 1 Application filed February 5, 1902. Serial No. 92,612. (No model.)

To aZZ whom it may concern:

Be it known that I, ZEOHARIAH RHODES TUOKER,rcsiding at Providence,in the county of Providence and State of Rhode Island, have 5 invented certain new and useful Improve-- ments in Grinding-D/Iachines,of which the following is a full, clear, andlexact description, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a grinding-machine; and its object is to provide a new and efficient means of mounting, of driving, and of feeding the grinding wheel or wheels.

To these ends the invention consists in the features of construction and combinations of elements, which will be hereinafter more fully set forth, and the novel features thereof specifically pointed out in the claims at the end of this specification.

While I illustrate and describe the invention in connection with grinding-machines, it will be understood that certain features thereof may be used in connection with various types of tools and in various relations with different kinds of machines.

A preferred embodiment of the invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation of a grinding- 0 machine, showing a reciprocating carriage and grinding-wheels mounted in accordance with my invention inoperative relation thereto. Fig. 2 is an end elevation of the same. Fig. 3 is a longitudinal vertical sectional View of the head which carries the grinding-spindle and the accompanying parts. Fig. 4 is a sectional view on line :rccof Fig. 3 looking in the direction of the arrow, showing also in elevation a central driving pulley and a forked bracket or guide therefor.

This machineas illustrated is especially adapted for grinding cylinders in cases Where two cylinders are mounted on a frame in such a way that each cylinder cannot be held in an ordinary grinding-machine and revolved to give the feed to the wheel.

A designates the frame of a grinding-machine, which may be of any desired construction and is provided, as shown, with a cone- 5o pulley B, mounted upon the shaft C, (shown in dotted lines in Fig. 1,) which shaft is belted or geared with the carriage-reciprocating mechanism. The carriage is shown at E reciprocable upon suitable ways upon the frame and having stops F F in connection therewith which contact with the pivoted lever Gr, through which the carriage reciprocating mechanism is actuated. These parts may be of any usual and well-known construction, as

it is only necessary in carrying out my invention that a suitable support should be provided for the work, which is preferably, as illustrated, in the form of areciprocating carriage.

l l are the two side members of abridge or span, which side members are bolted to the sides of the frame and are connected by a cross-piece 2 at some little distance above the top of the base, thus providing a space beneath the bridge through which the carriage can reciprocate, whereby both compactness of structure is obtained and the Working parts of the machine are protected, especially from emery-dust, which is always present in large quantities in the operation of these machines.

On the-undercut way or dovetail 3, carried by the bridge 2, are reciprocable two carriages 4, whichmay be secured at any desired point, as by means of gibs 5 and set-screws 6. These carriages are adjustable by means of independent screws 7, cooperating with feednuts 8, in order to agree with the center distance between the cylinders being ground, or they may be operated by a right and left hand screw or other means of setting them at the correct center distance with relation to each other. Mounted upon each of these carriages is the spindle of a grinding-wheel, and except wherein otherwise specifically indi- 9o cated a description of the mounting of one spindle applies to both.

Referring more specifically to Figs. 3 and 4, the spindle consists of a shaft 10, fitted with a grinding-wheel 11 at one end and tapered or conical bearings 12 12 at each end, which may be provided with suitable adjustments for taking up wear. At the outer end of the shaft 10 is a driving-pulley 13. This spindle is mounted in a sleeve 14, provided with suit- 10o able inclined bearing-surfaces 15, 'corresponding to the conical bearings upon the spindle-shaft. A portion of the exterior of this sleeve is eccentric, as indicated at 16, or it may be said that the bore withinv which the spindle is mounted is eccentric to the main axis of the sleeve. This eccentricity is provided as a means for bringing the wheel-spin dle to or from the center of the cylinder being ground to adjust for the depth of cut and compensate for the wear of the wheel. This adjustment is accomplished in this instance by means of a worm 17, teeth being cutin the sleeve which mesh with the teeth upon the worm 17 for rotating the sleeve. The power for driving this worm may be supplied in any suitable way, as here shown hand-wheels 19 19 being supported upon theend of the shaft which carries the worm. The shaft which carries the worm 17 has its bearings transverse to the shaftIO in a second sleeve 20, within which the sleeve 14 is mounted. An annular flange 21 is provided in connection with the eccentric portion 16 of the inner sleeve, which lies in a rabbet in the outer sleeve, and a means for adjustment and taking up wear is provided through thenut 21, which screws onto the threaded end of sleeve 14., as at 22, and bears against the outer end of sleeve 20. The sleeve is mounted in the same way, with a flange 23 at one end and a threaded adj ust-ing-nut 24 at the other within the head 25, which is formed integral with or may be suitably attached to the carriage 4, hereinbefore described. In order to feed the spindle with reference to the stationary cyl inder, means are provided by which the wheelspindle while revolving at a high rate of speed to give the cut to the Wheel may also describe a circle around the inside of the cylinder to furnish the feed of the wheel to the work. It will be seen that to belt to the spindle, which should run at an exceedingly high rate of speed, perhaps ten thousand revolutions per minute in the particular instance at hand, is an extremely difficult operation while the center of the spindle or shaft bearing the pulley is gyrating around in a circle. An ordinary arrangement of pulley and driving-belt would be inoperative because of the lack of uniform tension on the belt. In the present instance the sleeve 20 is eccentrically mounted within its head 25 and driven from a shaft 26, which carries a spiral pinion 27, keyed thereto, so as to have a long range of adjustment thereon by means of'extended keyways. (Shown in dotted linesinFigAat28.) Thisspiralpinionmeshes with spiral teeth 29, formed on the exterior surface of the outer eccentric sleeve. Shaft 26 extends transversely across the machine and carries a spiral pinion at each end, so that it provides a feed for each of the wheel-spindles,as illustrated,and it is driven by means of a pulley 30, located between the two carriages and suitably secured thereto. This pulley may be driven from any suitable source of power, a portion of a belt 81 being indicated in Fig. 1. The heads 25 may be capped, as shown, for purposes of assembling and of adjustment, the pinions27 being located within housings 32. In order to compensate for the variation in length of the belt due to the revolutions of the axes of the wheel-spindles, the eccentric sleeves 14 14,. carrying the wheel-spindlesyare set with one spindle at the top and the other at the bottom, or in such relative position as may be found most effective, so that as they feed they work in opposition to each other, and thereby compensate for the length of the belt 33, by which they are driven from any suitable source of power, as indicated in Fig. 2. In order to maintain sufficient contact with the belt and also to assist in such action of the spindles, an idler-pulley is located above and midway between the two spindles and the belt looped therearound. This pnlleyis supported upon a stud 36, which stud may be clamped at any point of a longitudinal slot 37- in the frame 38, thus providing an adjustment to compensate for stretching of the belt or for other reasons, as desired. A suitable adjusting-plunger 89 is preferably provided therewith, so that the adjustment may be readily secured by hand. Frame 38 is bolted at its end, as at 40, to the base or frame of the machine and may be also stiffened by being bolted to the bridge 2, as at 41. Extending inwardly from this frame and suitably secured thereto may be provided a forked bracket 42, the forks of which extend on either side of the pulley 30 to guide the pulley and belt, as this is mounted on a shaft and capable of sliding to allow for the adjustment of the spindle.

From the above description it is thought that the operation will be sufficiently clear. The work is chucked or supported in suitable relation to the grinding-wheels, and through the described mounting of the two spindles and means for driving and feeding them a construction is provided such that two cylinders may be ground at the same time efficiently and expeditiously. By the independent adjustment of the spindle-carriages the spindles may be .set at any desired point with relation to each other, depending upon the work to be ground, and the driving and feeding means are so arranged as to allow for such adjustment without interfering therewith.

It will of course be obvious that any even number of spindles which might be operated in pairs could be used instead of the duplicate construction herein illustrated. Moreover, it has been shown by. experiment that a machine will work using three spindles, set

one-third the way around the circle each. The error in such a case, if any, is so small as to be practically negligible. Accordingly the number of spindles which may be used in such a construction is practically unlimited. Where it is desired to use an odd number of live spindles, however, it may be preferable from the practical standpoint to obviate chances of error by adding an idler or dummy head carrying a pulley which would go through the same motions as the active or live spindle would, or a belt-tightening device could be arranged on the slack side of the belt feeding onto the first pulley.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In combination, a plurality of tool-spindles, sleeves within which said spindles are eccentrically mounted, means for rotating said sleeves, and means for driving said spindles from a common source of power.

2. In combination, a plurality of tool-spindles, a sleeve within which each of said spindles is eccentrically mounted, means for rotating each of said sleeves, and a single belt by which all of said tool-spindles are driven.

3. In combination, a plurality of tool-spin dles, sleeves within which said spindles are eccentrically mounted, means for rotating said sleeves from a common source of power, and a single belt by which said spindles are driven.

4. In combination, a plurality of tool-spindles, means for revolving each of said spindles about an outside axis, and means for driving said spindles from a common source of power.

5. In combination, a plurality of tool-spindles, means for revolving each of said spindles about an outside axis, means fordriving said spindles from acommon source of power, and means for independently adjusting the relative positions of said spindles.

6. In combination, aplurality of carriages, a sleeve revolubly supported on each of said carriages, a driven shaft and means for rotating each of said sleeves from said shaft, a tool-spindle eccentrically mounted in each of said sleeves, and means for driving said tool-spindles.

7. In combination, a plurality of carriages, a sleeve revolubly supported on each of said carriages, a driven shaft and means for rotating each of said sleeves from said shaft, a tool-spindle eccentrically mounted in each of said sleeves, and means for driving said tool-spindles from a common source of power.

'8. In combination with a work-holdingbase,

a plurality of carriages mounted on said base and independently adjustable thereon, a sleeve revolubly supported on each of said carriages, means for rotating said sleeves, a tool-spindle eccentrically mounted in each of said sleeves, and means for driving said toolspindles from a common source of power.

9. In combination with a work-holding base, a plurality of carriages, a sleeve revolubly supported on each of said carriages, means for rotating said sleeves from a common source of power, a tool-spindle eccentrically mounted in each of said sleeves, and means for driving said tool-spindles.

10. In combination with a work-holding base, a plurality of carriages, a sleeve revolubly supported on each of said carriages, means for rotating said sleeve,a tool-spindle eccentrically and adjustably supported in each of said sleeves, and means for driving said tool-spindles from a common source of power.

11. In combination with a Work-holding base, a plurality of carriages, a sleeve revolublysupported on each of said carriages, a tool -spindle eccentrically mounted within each of said sleeves, means for rotating said sleeves, and a single belt by which all of said spindles are driven.

12. In combination with a work -holding base, a plurality of carriages, a sleeve revolubly supported on each of said carriages, a tool -spindle eccentrically and adjustably mounted within each of said sleeves, means for rotating said sleeves, and a single belt by which all of said spindles are driven.

13. In combination with a work-holding base, aplurality of carriages, a sleeve revolubly supported on each of said carriages, a tool spindle eccentrically and adjustably mounted within each of said sleeves, means for rotating said sleeves, a single belt by which said spindles are driven, and an independent guiding device for said belt whereby proper tension of said belt with respect to said toolspindles may be maintained.

14. In a grinding-machine, in combination, a suitable base, carriages 4, 4, independently adjustable on said base, eccentric sleeves 20, 20, revolubly mounted on each of said carriages, a shaft 26, gearing between said shaft and each of said sleeves, a grinding-wheel spindle carried by each of said sleeves, and means for driving said spindles.

15. In a grinding-machine, in combination, asuitable base,carriages 4, 4, eccentric sleeves 20, 20, revolubly mounted on each of said carriages, a shaft 26, gearing between said shaft and each of said sleeves, a grinding-wheel spindle carried by each of said sleeves,means for driving said spindles, and means for independently adjusting said carriages with re lation to said base and to each other.

16. In a grinding-machine, in combination the wheel-spindles, the eccentric sleeves within which said spindles are supported, means for rotating said sleeves to feed the spindles, driving-pulleys on the outer ends of said spindles, a driving-belt common to said pulleys, and an idler-pulley in suitable relation to said driving-pulleys over which said belt passes, substantially as and for the purposes set forth.

17. In a grinding-machine, in combination, the wheel-spindles,the eccentric sleeves within which said spindles are supported, means for rotating said sleeves to feed the spindles, driving-pulleys on the outer ends of said spindles, a driving-belt common to each of said pulleys, and an adjustable idler-pulley in suitable relation to said driving-pulleys over which said belt passes, substantially as and for the purposes set forth.

18. In combination, the wheel-spindles, the eccentric sleeves in which said spindles are mounted for purposes of adjustment, the outer eccentric sleeves Within which said fi rstmentioned sleeves are mounted, means for rotating said outer sleeves in order to give the feed to the wheel-spindles, and a driving means common to said spindle.

19. In combination, the wheel-spindles, the eccentric sleeves in which said spindles are

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