US790298A - Cam-milling machine. - Google Patents

Description

PATENTED MAY 23, 1905..

} S. A. HAND. 0m" MILLING MACHINE."

APPLICATION FILED NOV. 7, 1904.

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W1 T NESSES:

No. 790.298. PATENTED MAY 23, 1905.

s. A. HAND.

0am MILLING MACHINE. APPLICATION FILED NOV. 7, 1904.

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WITNESSES. I I INVENTOR.

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N0. 79O,298. v PATENTED MAYZB, 1905.

s. A. HAND.

G AM MILLING MACHINE.

APPLICATION FILED NOV. 7. 1904.

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PATENTED MAY 23, 1905; s. A; HAND. I 0m MILLING MACHINE;

APPLICATION FILED NOV. 7, 1 904.

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[Nlf'E/VT9126M I Edi/ e y? 1 1 ATTORNEY S.A.HAND. 01 1.1, MILLING MACHINE. APPLIOATI'ON-PILED NOV. 7, 1904.

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INVENTOR. W/(M4 ATTORNEY.

Patented May 23, 1905.

UNITED I STATES" PATENT OFFICE.

SAMUEL ASHTON HAND, OF CLEVELAND, OHIO, ASSIGNOR TO CHANDLER & PRICE COMPANY, OF CLEVELAND, OHIO.

CAM-MILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 790,298, dated May 23, 1905. Application filed November "7, 1904. Serial No. 231,673.,

To all whom it may concern:

Be it known that I, SAMUEL AsI-rroN HAND, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Cam Milling Machines; and I do declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertain's to make and use the same.

My invention relates to cam-milling machines; and the invention consists in a machine constructed and adapted to operate substantially as shown and described, andparticularly pointed out in the claims.

In the accompanymg drawings, Figure 1 is a side elevation of the machine, and Fig. 2 is a front elevation thereof. Fig. 3 is a plan view with some of the parts horizontally sectioned, and Fig. 4 is a cross-section of the machine on line 0c 00, Fig. 3. i Fig. 5 is a sectional elevation of themachine on a line corresponding to z 2, Fig. 6; and Fig. 6 is a sectional elevation corresponding to line y 1 Fig. 5.

The machine thus shown is designed to mill cams of various sizes and contour which have oppositely-walled channels upon their faces; and the machine contemplates especially the doing of this work with perfect uniformity in all portions of the cam groove or track whether near to or farther removed from the center or axis of rotation, and to this end the operating mechanism provides for differentiating or varying the speed of ro 'tation of the cam in respect to the millingtool according as the tool is working at one point or another or as it may be nearer to or farther from the center of rotation, as above indicated, thus making the cam move at the desired rate of speed all the time in whatever portion thereof the tool may be engaged.

A represents the base of the machine, and B a bed slidable in guideways therein and carrying the milling-tool and other parts, as will be seen farther along.

C represents the master or controlling cam, which is part of the machine and is of a flatring shape, as seen in Fig. 3.

D is the cam or work wrought upon by the 3 milling-tool and is adapted to be temporarily secured in position for milling and to be removed and another placed in its seat, and so on as each cam is finished in its turn: The cam D therefore is not a part of the machine.

E is a back supporting gear-wheel for both cams and upon the front side of which the master-cam is rigidly secured and held in position relatively as seen in Fig. 3. The said support is fixed at its rear upon a head or heavy disk-shaped fiangef, carried b a relatively short and heavy shaft or spindle F, working in a suitable bearing upon the main frame. The said cam-support E is a gear member andis provided centrallywith a short pin or projection d, upon which the cam D to be milled is engaged through'its hub (1 and screws or other means may be employed to fasten cam D temporarily upon said support. This brings the cam-tracks or walled cam-channels c of master-camC and the camtracksd of work-cam D into the same vertical or face plane, Fig. 3, and renders available my special style of milling mechanism, as will now appear. In this connection it is to be observed that the two tracks are exact counterparts of each other in contour or outline, though of widely-difierent proportions in cross-section, and the track 0 of the master or governing cam acts as a guide for the work done by the milling-tool in track (1 through the instrumentality of guide-head G. The said guide-head G is of substantially triangular face outline, as seen in Fig. 5, and has proportions otherwise relatively as seen in Figs. 1 and 6 and is s lined or fixed at its lower angle on rock-sha t H. A shaft J, which carries the milling-tool L, has its bearings in the inner of the upper angles of said head, and guide-roller N, which runs in cam-track 0 of the mastercam, is mounted 011 its own shaft n, in the outer angle thereof, and is adapted to be separately moved into and out of engagement with said track by moving its shaft axially through handle a thereon. However, the bed B, Figs. 2 and 6, which carries head G and other parts, is adapted to be bodily moved toward and from the cam arts, and thus both millingtool L and gui e-roller N may be carried into and out of working relation with said cams at once as the operations of the machine may require. Such adjustment of base B is effected through hand-controlled screw K, having hand-wheel 7c, Fig. 5, and said bed has dovetailed or other suitable guides on the base A. Power is applied to this mechanism through pulleys P on shaft R, and different lines of connection are made with this shaft as power is needed here and there, as will now appear. Thus one line has to do with the actuation of the milling-tool and another with the rotation of the master-cam, and there is a subordinate or incidental line of speed-regulating mechanism off from the mill-driving mechanism.

Power-shaft R is supported in suitable bearings on or from base B transversely at one end of the machine, and power is conveyed therefrom to tool shaft J through bevel-gear 2 on shaft R, meshing with bevelgear 3, mounted on a sleeve 4, which is supported upon an extension of rockshaft H. The sleeve4 is free to turn on shaft H and car ries a pinion 5, in mesh with gear S 011 millingtool shaft J and through which power is transmitted to said tool.

Regulation of the speed of the milling-tool is back from the master-cam through head G, rock-shaft H, toothed segment it upon said shaft H, pinion h on short shaft 7L2, engaged by said segment 72,, and gear 7L3 on the other end of shaft k engaging the slidable rack-plate H on bed B. The said rackplate H carries a post it, through the upper portion of which the power-shaft R extends and in which said shaft is rigidly fixed, so that said shaft is moved axially in its bearings by or through said rack-plate, and the power-engaged pulleys P and gear 2 have said shaft in sliding relation therewith, as well as being rotated thereby, and such connection or relation may be effected in any good mechanical way, as by sleeves or the like. Finally, as to power-shaft R, it carries a friction-wheel 7, which engages at its periphery with the face of friction-disk 8 upon shaft T, 'and the speed of rotation of the master-cam is determined through this line of mechanism, and especially as it is affected or controlled by the position of wheel 7 in relation to friction-disk 8 on a principle now well known in speed-variable mechanisms.

Power may be communicated to the master-eam, or rather to its supporting-gear E, from shaft T by any suitable connections; but in this instance the connection is made by a belt 12 from shaft T to parallelpulleyshafts 13 and 14, carrying difierential pulleys which are operatively united by a band 16, and a worm 17 on shaft 14, working with car 18 on shaft 20, Fig. 4. A worm 22 on shaft 20 engages the master-cam supporting-gear E, and thus by this series of coacting parts power is transmitted to gear E from powershaft R through the variable-speed mechanism in wheel 7 and friction-disk 8. Gear 18 on shaft 20, Fig. 4, is frictionally engaged by disk 23 on its face, fixed to rotate with said shaft, and a nut 24 locks said parts operatively together. By releasing nut 24 and loosening disk 23 the shaft 20 can be rotated by hand by inserting an instrument in hole 25 or by any other available means or way.

Now, having the various parts constructed, arranged, and operatively united as hercinbefore described, power is distributed or obtained from shaft R, which runs at any suitable regular speed, and its first direct application of power is to the milling-tool l 1. This tool is of a size corresponding substantially to the size of the cam-groove in cross-section, and varying sizes of tools are used with varying sizes of cams. Obviously also if the size of cam D be changed a corresponding change is made in the master-cam, and the same is true as to varying contours of the 2am 1) whether the sizes be large or small; but it is desirable that the milling-tool should work uniformly in its travel about cam D, and such uniformity extends to the speed of rotation of said cam, as well as to its work on both sides of the walls (Z thereof. The latter effect is gotten through properly centering the tool in and through guid e-head G, and uniformity of speed is obtained through the speed-variable mechanism culminating in parts 7 and 8, having in mind the longer travel about the outer circuits of the cam farthest from the center of rotation and the inner circuits nearer said center. It therefore follows that as the center or axis of rotation is left by the tool for work in the outer circuits the travel, or speed of the cam should be correspondingly slackened and as said center is approached it should be increased. The initiative of these changes both ways is in head G, with its rock-shaft H working thence positively upon power-shaft R and carrying wheel? to a corresponding relation to or upon the face of disk 8, and speed of disk 8 is increased or diminished as wheel 7 approaches to or goes from its center. This regulates the rotation speed of the cam by way of shaft T, as already described. The work of the milling-tool is therefore automatically controlled as to its speed and center of work, and the primary speed may be regulated in any usual way through or upon power-shaft R.

The shaft T is supported at one end on a yoke 30 from an arm 31 on the main frame or base and by an arm 32 at the other end, and lateral projections 33 and 34 from the side of base A support shafts 13 and 14.

What I claim is 1. In cam-milling machines, a rotatable gear-support constructed at its center to carry a cam and a master-cam ring on the outer face of said support, a guide-head and a projection thereon engaged in said mastercam, anda milling-tool rotatably supported on said head, a rock-shaft carrying said head, and means actuated through said shaft to vary the speed of rotation of said camsupport comprising gear-and-rack mechanism and a sliding shaft operated thereby, a friction-roller on said shaft, a friction-disk engaged by said roller, and a train of power drive mechanism leading back to said gearsupport.

2. In a cam-milling machine, a suitable base and a slidable bed thereon, a rock-shaft on said bed and. a guide-head fixed to said shaft, a milling-tool and shaft therefor supported on said guide-head, a rotatable master cam, a roller on said head engaged with said cam, a rotatable support carrying said cam and mechanism to rotate said support comprising a worm-gear member and drive-shaft 20 therefor, parallel ulley-shafts 13 and 14 and gearing and be ting connections with said shaft 20, a friction-disk and shaft for operating shafts 13 and 14, a slidable shaft and friction-wheel to operate said disk, and

rack-and-gear mechanism for said slidable shaft having operating connections with said rock-shaft.

3. In a cam-milling machine, a suitable base and a slidable bed thereon, a rock-shaft supported on said bed and a rocking head fixed on said shaft, a milling-tool shaft and drivegear therefor supported on said head, a guide roller and a shaft therefor slidably supported on said head, a master-cam engaged by said roller, means to rotate said cam having actuating connection with the power shaft and speed-varying mechanism therefor actuated from said rock-shaft, and means to slide said bed carrying the millingtool and guide-roller parts back and forth in respect to the work and master-cam.

4. In a cam-milling machine, a base and a slidable bed thereon, a rocking guide-head su ported on said bed, a master-cam and a rol er on said head engaged in said cam, a

roller for independent throw-out movement thereof.

5. In a cam-milling machine, a base and a slidable bed thereon, means to slide said bed back and'forth, a power drive-shaft slidably supported upon said bed, a rock-shaft and guide-head thereon supported upon said bed, a friction-roller on said drive-shaft and a friction-disk engaged bysaid roller, rack-andgear mechanism having operative connection with said rock-shaft and adapted to slide said drive shaft, a rotatable gear-support for a master-cam and the work, a milling-tool and shaft therefor supported on said rocking guide-head and having gear connections with said drive-shaft, a slidably-supported roller upon said guide-head adapted to engage the master-cam, and power drive mechanism leading from said friction-disk to said rotatable gear-support.

6. In cam-milling machines, a rotatable gear-support for a master-cam and the work, a suitable base, a slidable bed on said base, a rocking guide-head and a tool-shaft and milling-tool thereon supported on said bed, a guide-roller for said guide-head, a driveshaft slidably mounted on said slidable bed, operative connections between said rocking guide-head and said drive-shaft adapted to slide said shaft as said head is rocked, and friction drive mechanism operated by said drive-shaft and having drive connections for said rotatable gear-support.

In testimony whereof I sign this specification in the presence of two witnesses.

SAMUEL ASHTON HAND.

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