US1241838A - Pattern-lathe. - Google Patents

Description

E. A. EASTMAN.

PATTERN LATHE.

APPLICATION FILED OCT. 23. 1913' 1,241,838. Patented 0011.2,1917.

3 SHEET$SHEET l.

E. A. EASTMAN.

PATTERN LATHE.

APPLICATION FILED OCT. 23. 1913. 1,241,838. Patented 001;. 2,1917.

3 SHEETSSHEET 2.

E. A. EASTMAN.

PATTERN LATHE. APPLICATION FILED OCT. 23. 1913.

Patented Oct. 2, 1917.

3 SHEETSSHEET 3.

30 4 r they are beyond the capability of theordi- STATES PATENT OFFICE.

ERNEST A. EASTMAN, OF DAYTON, OHIO, ASSIGNOR OF ONE-HALF TO THE CRAWFORD, MoG-REGOR AND CANBY (30., OF DAYTON, OHIO, A CORPORATION OF OHIO.

1 PATTERN-LATHE.

To all whom it may concern:

Be it known that I, ERNEST A. EASTMAN, citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Pattern-Lathes, ofwhich the following is a specification.

My invention relates to wood Working machines, and particularly to pattern or copying lathes for turning irregular shapes. The machine herein described is especially adapted for turning shoe lasts, heads for golf sticks, gun stocks .and other articles of similar nonsymmetrical form, and is an amplification and improvement of the construction set forth and described-in my copending application for Letters Patent, Serial- No. 755,667, filed March 20, 1913.

The object of the invention is to simplify the structure as well as the means and mode of operation of such machine, whereby they will not only be cheapened in construction, but will be more eflicient in use, automatic in action, easily and quickly adjusted and unlikely to get out of repair.

Shoe lasts of the extreme shape necessary to meet the requirements of manufacturers of shoes of the present styles termed in the trade as thin comb lasts, have the curvature at each side of the last so pronounoed ,that

nary last turning machine to produce.

One of the primary objects of the inven tion is to provide a machine by which lasts 01' other ,articles embodying such extreme shapes may be automatically turned wlth great accuracy at a single operation. To thisfend there is employed in the present construction two cutter heads actingin parallel successiveplanes, the primary head being of comparatively large size and strength and adapted to turn thorough block or stock into a general semblance ofthe finished product without however, %"fving the exact or finished shape thereto. he second cutter head being of sufliciently small size to enter and follow the lines of the extreme curvatures is adapted to reduce the stock to its ultimate or finished shape. Inasmuch as both cutter heads are controlled by a single master or pattern wheel. it is necessary that the paths of operation of the two heads shall be closely adjacent. In actual operation the path of the primary head merges into that of the second head. In the Specification of Letters Patent. Patented Oct, 2, 1917, Application filed October 23, 1913. Serial No. 796,95].

extreme cases the change of shape many times is so abrupt that even with such conone cutter head may be adjusted to and from the work independent of the other. The cutter heads as herein shown and described are, further adjustable independently to different horizontal planes, whereby the center of operation of one cutter may be above or below that of the other. -To further facilitate the turning operation and to avoid abrupt variations of the longitudinal alinement of the work, it has been found desirable to change the general axis upon which the last is turned by the use of an offset dog as is hereinafter described. With the above primary and other incidental objects in view as will more fully appear in the specification, the invention consists of the features of'construction, the parts and combinations thereof and the mode of operationor their e uivalents as hereinafter described and in the claims.

Referring to the drawings, Figure 1 is a front elevation of a pattern or copying lathe, in which the invention is embodied. Fig. 2 is a detail plan view of the cutter head carriage. Fig. 3 is a rear elevation thereof. Fig. 4 is a side elevation thereof showing the driving connections of the variable cutter heads. Fig. 5 is a detail view of a last showing the offset axis of the rotation as compared with the axis ordinarily employed. 4

Like parts are indicated by similar characters of reference throughout the several views. a

While the present invention relates pri* marily to the cutter heads in their relation one with the other, together with their driving connections, in order to illustrate the application of the invention and its relation to other portions of the apparatus and the method of operation, there has been shown set'orth.

50 a of at greater pr less distances from theaxis,

. which project upright standards v3 conneted one. with the other and suitably braced to form a ,rigid, main frame.

Pivotally supported? upon forward extending arms 4, carried by the upright standards 3, isa swinging frame compr1s-, ing pendent arms 5 connected by transverse bars 6 and suitably braced into a 'rigid structure, which is free to oscillate forward and rearward about its -pivotal connections 7. p

Carried upon suitable trunnions, journaled in bearing bars .8, is .the revoluble master form 9.' The drive trunnion of the master form carries a gear pinion 10, meshing witha corresponding pinion/11, upon a counter shaft 12. This counter shaft '12 carries a second pinion 13'meshing w1th ,a corresponding pinion 14, upon the drive spindle .or trunnion 15, with which is J engaged the last block or other work 16- to beoperated upon. The counter shaft 12 carries at its extremity a pulley 17,'connectedby a belt 18 with a counter shaft 19,

operatively connected through sundry belts "and countershafts with the main drive shaft '20 journaled in the lower part of the main frame. By the rotation of the main drive, shaft 20, the counter shaft 12 is rotated to;

revolve the master form 9 and the work 16 unison. -This revoluble movement of the master form and work continues at a uniform rate, regardless of the oscillatory movement of the swinging frame.

Slidingly mounted to reciprocate .upon the bed '1, is a traveling. carriage-*"21', carrying a master or guide wheel. 22, engaging themaster form 9, and a second traveling carriage 23, carrying the cutter heads, which form the subject matter hereof and which operate upon the work 16, journaled in the swinging frame and rotated by the countershaft 12. -These traveling carriages 21 and 23 move in unison under the influence of feed devlces.

The swinging frame at all times tends to move inward which movement is arrested by the engagement of the master form 9 with the guide or master wheel 22. As the master'form 9 is rotated, the-portions therebrought into engagement with the master or guide wheel, causes the. swinging frame every portion of the block or rough stock,

whereby there is produced a finished prod matinee not which is the counter part of the master,

form 9. This is the usual construction and operation of turning machines of this type,

invention.

d in itself formsno part of the presentto Journaled in suitable uprights 24 carried by the carriage 23 is a revoluble shaft 25 arranged at an inclination to the axis of the work and to the path of travel of the carriage 23, carrying at one end a cutter head 26. a This cutter head may be of any suitable shape or construction. In the drawings it has been shown in the form of two curved loop shaped blades. *It may however, be provided with aplurality of flat cutting blades tangentially arranged. The cutter heads per 86 form nopart of the present invention. jSlidingly mounted in, suit-.

able guides or ways 27in the uprights or standards 24 is a vertically adjustable frame 28, having formed'therein horizontal guides or ways 29. Slidingly mounted in the ways or guides 29 of the adjustable frame 28,'is a horizontally movable frame ,30 in which is journaled a second shaft 31, carrying at its extremity a second cutter head 32 of Y greater diameter than'the cutter head 26 operating in a plane parallel with the cutter head 26 but slightly in advance thereof. This cutter head 31 is the roughing cutter and serves to remove the greater portion of the stock preparatory to the finishing cut made by the first mentioned cutter head 26. The frame 30 is adjustable horizontally in the guides. or ways 29 of the frame 28 to vary the relation of the shafts 25 and 31 to and from each other by cans of an adjusting screw 33 carried b the frame 30 and engagin the transverse bar 34 of the vertically ad ustable frame 28. An adjusting screw 35 supported in a transverse bar 36 of the carriage 23 andengaging a transverse bar 37 of the adjustable frame 28 is employed to adjust said frame 28 vertically in the guides 27 carrying with it the frame 30 and shaft 31 with 1ts'.cutter, head 32,. thereby varying the relative horizontal planes of the cutter heads. It is to be noted that the shafts 25 and 31 are both arranged at an inclinationtothe axis of rotation of the work and to the. path of. travel of the ,carriage 23, and are preferably though not necessarily arranged parallel one with the other. If found desirable to meet the 'peculiar conditions of operation, the shafts may be arrangedsat difi'erent degrees of inclination with the axis of rotation of vthe work or one of the shafts may besubstane tially parallel therewith while the other shaft may be incliped. Such variations being very obvious will not need illustration.

The finishing head and roughing cutter head are rotated at diflerent rates of speed. I

The relative rates of speed will depend somewhat upon the relative proportions of the cutter heads. With the cutter heads of approximately the proportions shown in the drawings it has been found most desirable to rotate the roughing cutter head at a rate of approximatel per minute, whi e the finishing cutter head rotates at an approximate speed of ten thousand revolutions per minute.

To maintain an operating driving connection by which the cutter heads will be rotated at a constant'rate of speed throughout the longitudinal movement of the traveling shaft 31. On account of the carriage 23, there is provided upon the drive shaft 20 a drum 38 over which passes a belt 39 driving a pulley 40 upon the cutter head great difference in the diameters of the driving drum 38 and .the driven pulley 40, idler ulleys not shown in the drawing, are provi ed upon the carriage 23 to change the direction of the travel of the belt to insure a driving contact between the belt 39 and the pulley 40 throughout a suflicient portion of the periphery thereof. At its extremity opposite the cutter head 32, the shaft 31 carries a second pulley 41. The shaft 25 carries at the corresponding end a pulley 42 and a hand wheel 43. J ournaled upon an adjustable trunnion 44, slidingly mounted in a slot or guideway 45 in the upright or standard 24 is an idle pul- 1ey,46. This idler pulley is vertically adjustable in its guideway by means of an ad j usting screw 47 J ournaled upon a trunnion projecting from a suitable bracket 48, carried by the carriage 23, is an additional pulley 49. A driving belt shown by dotted-lines in Fig. 4, passes over the pulley 41 of the shaft 31, thence under the idler pulley 46 and over the pulley 42 of the shaft 25, thence under the idler pulley 49 and back to the initial pulley 41. This serves to drive the shaft 25 in unison with the shaft 31. The adjusting screw 47 is employed to adjust the pulley 46 to compensate for any variation in the tension of the belt 50 due to the adjustment of the shaft 31 and the pulley 41 e1ther vertically or horizontally by means of the adjusting screws 33 or 35.

. vance of the p p duces the approximate form to the shape By the constructlon herein described the roughing cutter head removes the surplus stock to an ap roximate form sligihtl in adishing cutter hea ,w ich recorresponding'exactly with the master form. The two cutter heads operate inplanes closely adjacent one to the other, but are capable of adjustment to and from each other, whereby the roughing cutter head may be made to cut to a greater or less distance beyond the center line of the finishing cutter head or the shafts may be relatively varied vertically to cause one cutter to operate at a higher or lower level than' the other and therefore in advance of or behind the other upon the periphery of the work.

six thousand revolutions jacent planes, and means for relativel cutter to out beyond the finish line of the product, it is desirable to offset the last or change its axis of rotation as shown in Figs. 1 and 5. Referring particularly to Fig. 5 the dotted line 00 w represents the axis of rotation as ordinarily used and which would be commonly used when the roughing and finishing operations are performed separately or upon separate machines. However, to permit the high comb type of last to be automatically turned at a single operation, there has been provided an offset dog 51 to support the heel of the last in an offset or eccentric position, whereby the axis of rotation is changed from the line a: w to the line g y. The toe center 52 is retained in the same position, but the heel center is shifted upward adjacent to the upper edge of the last thereby causing the comb to be lowered that its outline will be inclined at a less obtuse angle with the axis of rotation. This obviates any danger of the comb being damaged by a too deep cut of the roughing cutter. It is to be understood that both the pattern or model last and the work are provided with similar ofi'set dogs 51.

From the above description it will be apparent that there is thus provided a device of the character described, possessing the particular features of advantage before enu-.

merated as desirable but which obviously is susceptible of modification in its form, proportion, detail construction or arrangement of parts, without departing from the principle involved or sacrificing any of its advantages. I

While in order to comply with the statute, the invention has been described in language more or less specific as to certain structural features, it is to be understood that the invention is not limited to any specific details, but that the means and construction herein described comprise but one mode of putting the invention into efiect, and the invention is therefore claimed broadly in any of its possible forms or modifications within the scope of the appended claims.

Having thus described my invention, I claim;

1. In a machine of the character described, a support for the work to be operated upon, two revoluble cutter heads eccentrically mounted to engage the work in parallel a3- a justing the heads, whereby one of said eads may be made to operate a greater or less distance across the center line of the other head.

2. In a machine of the character described, a support for the work, two revoluble cutter heads arranged side by side with one of the heads overlapping the other, and means for "relatively adjusting the heads to vary the degree of overlap.

3'. A combination with two rotary cutters, a support laterally movable to and from the rotary cutters in which the WQI'klS revolubly mounted, and a control device regulating the depth ofoperation of t e cutters, of a movable primary support f r one of the rotary cutters, a movable auxiliary support upon which the primary support is movable, a traveling carriage upon which the second rotary cutter is mounted and upon which the auxiliary support is movable in a direction angular in relation. with the direction of movement ofthe prlmary Jsupport, said traveling carriage being movable in a direc- 'tion angular to the direction of movement of both the said supports and means for rota'ting the cutters in all positions of adjustment. a

4. In a pattern lathe, means for rotating I the work, a roughing cutter and a finishing menace work, said butters being of difierent diameters whereby the larger cutter will project beyond the center line of the small cutter and means to adjust the cuttersin their planes of rotation in relation one with the other; 7 6. In a machine of the character described, a support for the work to be operated upon, two revoluble cutter heads operating simultaneousl upon 'a single iece of work, a

master e ement common to 0th cutter heads,

said'cutter heads being normally variable in unison in relation with the work, nd means for adjusting one of the cutter heads tangentially to a diflerent plane in relation I with the work independent of the other outterhead. I a

7; In a machine of the character described, a support for the Work to be operated upon, two revoluble cutter heads simultaneously engaging a single piece of work, a master element common to both cutter heads, the;

relative variation of the work and cutter heads being normally common to both cutter heads and means for adjusting one of the cutter heads both vertically and laterally independent of the other'cutter head,

In testimony whereof, I have hereunto set my hand this 10th day of October 1913.

ERNEST A. EAST a Witnesses:

HARRY F. NOLAN, Bess CnoAsMUN.

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