US99356A - Improved g-ear-ctttting- machine - Google Patents

Description

W. SELLERS. GEAR CUTTING MACHINE.

No. 99,356. I Patented Feb. 1, 1870.

ms NORRIS PETERS sq. morouwu, WASHINGTON, D, c.

WILLIAM SELLERS, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No. 99,356, dated February 1, 1870.

IMPROVED GEAR-CUTTING- MACHINE.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, \VILLIAM SELLERS, of the city of Philadelphia, and; State of Pennsylvania, have in vented certain new and useful Improvements in Gear Cutting Machines; and I do hereby declare the following to be a full and exact description of the construc-' 'tion and ope-ration of-lfiiie' same, reference being had to the annexed drawings, and to the figures and letters of reference marked thereon.

In all gear-cutting machineshaving a revolving cut ter, the cutter-spindle is carried by a sliding head or saddle, feeding the revolving cutter up to its work inthe required direction, and the slide,which carries this cutter-head, is adjustable about an axis, in order to .adjnst it to the varying angles of wheels to be cut,

and a means is also provided for adjustment of the;

'cutt'enspindle, so that the teeth may either be out,

parallel with the axis of -the wheel, as in ordinary' spur-or bevel-wheels, or obliquely to the axis, as re-' quired for worm-wheels.

The driving-power is conducted to the cutter-spin die by a' belt, which must be capable of adapting it-" 1 self to the constantly-varying position of the cutterhead, and yet always retain the required uniform tension.

In gear-cutting machines of ordinary construction, this end is accomplished by the use of an intervening swim-frame which is se )arate from the machine and r O 7 7 suspended, so as to permit its countershaft to yield in such a direction to the sliding cutter-head as will maintain the driving-belt at the proper tension for its work.

This tension is obtained by means of counterweights,

ter may be transmitted through the axes about which i the various adjustments are made, and with such arrangement. I combine, within the machine itself, all

the elements required for supplying a uniform driving power from an ordinary line or cuuntershaft, without the use of an intervening and separate swing-frame.

To this end, I make the slide, upon which the cutterhead traverses, adjustable about an axis, as in other machines. This "axis I make also adjustable parallel to the axis of the wheel to be out. In addition to these, I provide an adjustment for the cutter-spindle around an axis, at right angles to its own axis, and through .the axes, about which the said adjustments of the slide and cutter-spindle are made, I so conduct the power to drive the cuttenthat the functions of this drivingmechauism shall remain the same in all positions of the slide and cutter-spindle around their axes, and

during the constantly-varying positions of the cutterhead upon the slide.

- In the machine hereafter fully described, the stand carrying the'sl iding cutter-head is provided with an upwardly-extending column, which is made adjustable in its base, so as to turn on its axis, for the. purpose of adjusting the line of motion of the cutter-head to suit wheels of any angle. On the top of this column I provide a short horizontal countershaft, which has its hearings on a plate or cap, fitted to the top of the column, in such a manner that it also may be turned on the vertical axis of the post. The driving power is conducted from the above countershaft through the vertical axis of motion to the upper cone-pulley of the machine, by means of two pairs of bevel-wheels, the action of which remains the same at all positions of the cap around the axis of the column; and it thus follows, that no matter what the requisite position of the column around its vertical axis may be, its cap may always remain so adjusted as to keep its countershaft,

and driving-pulley parallel with the fixed line shaft from which the power is taken. From the upper conepulley, a belt passes over two carrying-pulleys to the lower or traversing cone-pulley on the sliding head, which carries the cutter. And a feature of importance in my invention consistsin the arrangement of these carrying-pulleys with reference to the cone-pulleys, whereby the driving side of the belt is passed over a carrying-pulley, having its axis fixed, whilst the slack side of the belt passes over a carrying-pulley which has its axis movable, so that the counterweight required to maintain the tension, is only that required for the slack side of the belt, whilst in all other machines, a weight that will counterbalance the tension of the driving side is required in addition.

In order that my saidlinvention may be fully understood, I will .now proceed more particularly to describe the same.

On reference to the drawing, making part of this specification, and in which similar letters of reference allude to like parts in the several views Figure l is a front elevation of, my improved gearcutting machine;

Fignre2 is a side elevation Figure 3 is a plan of the lower part of column sliding cutter-head and dividing-head; and

I Figure 4 is a plan of the driving-arrangement on top of the column. v

A is the stand, carrying the sliding cutter-head B on a laterally-extending arm, 0. This stand A extends upward in the form of a column, and is adjustable around its vertical axis on a. saddle-plate, D, which is so fit'ted to one of the arms of an L-shaped bed, E, as to permit any required adjustment within the limits of this portion of the bed, which stands parallel to the axis of the wheel to be cut;,the stand F, for carrying thelatter, being supported on the other extension of bed E, on which it also has a longitudinal adjustment, so as to adapt its position to the various diameters of wheels to be cut.

In the drawing, this stand is represented as carrying the wheel G to be cut, on a spindle, which, at its rear end, is fitted with a perforated dividing-plate, H, I and pin H, for making the division, determining the required number of teeth to be cut around the circumference of the wheel. In place of this arrangement, any other of the well-known dividing mechanism, such as a worm-wheel and worm or system of change-wheels may be substituted.

. The radial adjustment of the stand A around its vertical axis, combined with the lengthwise adjustment on its portion of the bed, permits the sliding cutterhead B to be moved at any angle to the axis of the wheel, so that wheels of any description, from a spur to the acutest bevel, may be cut.

The driving-mechanism for conducting the power to the cutter is arranged in the following manner:

To the'top of the column A is fitted a circular capplate, I, secured to the top flange of the column by bolts jj, but so arranged, that it may be turned into any position around the axis of the column. his cap carries, in bearings K K, a horizontal shaft, L, which may receive motion from any convenient counter or line-shaft, by means of a belt running on its pulley M. This motion is transmitted to the upper cone-pulley N at the side of post A, by means of a short lllilBIlIlfidl? ate shaft, 0, and two pairs of bevel-wheels, P I and Q Q. The vertical bevel-wheel shaft 0 has a bearing in the cap-plate I, the axis of rotation coinciding with that of the cap-plate I and of column A.

By t-h us transmitting the'drivin g power through the axis about which the various adjustments are made, the column A may, without disturbing the action of the intermediate driving-gear, be placed in any required position around its axis, or relative to its capplate I, which always remains so adjusted as to keep the horizontal driving-shaft L in parallel line with the shaft from which the power is taken.

The manner of transmitting this driving power from the upper cone-pulley N to the cutter-spindle R is best 'understood on reference to figs. 1 and 2 of the draw- 'ing. The outter-spindleR is held in bearingsa and b, and driven by means of bevels c and d, from a shaft, e, which, at its rear end, carries the'lower or traversing cone-pulley S, and around the axis of which the plate T, carrying the spindle bearings a and b, has a A limited adjustment, for varying the position of the spindle relative to its line of motion in cutting.

it is the driving-belt, which, to conduct the driving power to the cutter-spindle in the proper direct-ion, must run in the direction indicated by the arrows, fig. 1. This-driving-belt passes over two carrying-pulleys, U and V, one of which, U, carries the driving side of the belt, and revolves on a fixed shaft, supported by an arm, 1', extending from the side of the column A, while the other carrying-pulley, V, carries the slack side of the belt, and is suspended at one end of a movable frame, composed of two curved levers, J J, which vibrate around the axis of the upper cone-pulley shaft 12, and carry at the other end the counterweight X. This weight is only required heavy enough to maintain sutlicient tension for the slack side of belt, the reproduced by its frictionalcontact with the fixed carry- It will now be evident, that by means of the swinging carrying-pulleyV and counterweight X, the driving-belt will adapt itself to the constantly-varying positions of the sliding cutter-head, and always retain the required uniform tension.

Having thus described the nature and object of my improvements,

by Letters Patent, is- 1. The combination of the adjustable column A, adjustable shaft L, and adjustable plate T, arranged with the column A can be adjusted laterally and about its the axis of the column, and the power to drive the purpose specified.

2. In combination with the driving cone-pulley and traversing cone-pulley, the use of two carrying-pulleys, one having a fixed, and the other a movable bearing, Weighted at the end, and carrying, respectively, the driving andslack side of' the belt, in the mannerand for the purpose set forth.

- WM. SELLERS.

Witnesses Annw. J. Boswnnn,

Jns. H. SCHWAOK. v

quired tension for the driving side of the belt being ing-pulley U, over which it passes at an acute angle.

/V hat I claim as my invention, and desire to secure 5 reference to each other, to the arm 0, and to the sub; sidiary mechanism, substantially as described, so that the direction of the axis of the shaft L being fixed,

own axis, and the plate 'I. be adjusted laterally and I about an axis perpendicular to a plane passing through cutter be transmitted through the axes about which the adjustments are made, substantially as and for the

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