US1857986A - Automatic turning machine - Google Patents

Description

Filed Nov. 4, 1929 4 Sheets-Sheet l l l l :51111 May 10, 1932- D. TuRcoTT AUTOMATIC TURNING MACHINE Filed Nov. 4, 1929 4 Sheets-Sheet 2 May 10, 1932. D. TURCOTT 1,857,986

AUTOMATIC TURNING MACHINE Filed Nov.`4, 1929 4 Sheets-Sheet 3 May 10, 1932. D. TuRcoTT AUTOMATC .TURNING MACHINE 4 Sheets-Sheet 4 ,Filed Nov. 4, 1929 y Inc/671167'- Qwmkaz/d/ Ta/CQZZ B Y "Quad Patented May 10, 1932 UNITED STATES PATENT orifice` -V DAVID TURCOTT, F.' BELOIT, WISCONSIN, ASSIGNQR TO YATES-AMERICAN MACHINE COMPANY, 0F BELOIT, WISCONSIN, A 0,013PORATIQN0F DELAWARE l AUTOMATIC TURNING Meennvni Application mea November 4, 1929. smaila; 404,595.

y The present invention relates to automatic wood-turning lathes of .the type in which the Work is brought into engagementwith rotating knives and is rotated on its own axis 155 while in such engagement.v l

The principal object of `the invention is to provide a novel -pneulnatically operated tail stock for such a lathe, which tail stock is in many respects a very distinct improve- 16 ment over the tail stocks heretofore employed. l

A tail stock constructed in accordance with the invention is instantaneous. and dependable in its operation, grips. vthe work firmly It' when actuated by the operator, andreleases the work automatically after the turning operation has been completed.

@ther objects and advantages of the invention will be apparent upon a full understand- '7N ing of the construction, arrangement and operation ofthe improved tail stock.

In order'that the invention may be readily understood, one form ofthesaine is presented herein, but it will of course be apprely forthe purpose of exempli'iication and that the invention is susceptible of embodiment in.A other structurally modi-hed forms coming Fig. 5 is a transverse section, taken on the" line 5-5 of Fig. 3'; A l

Fig. y6 is vanother transverse section, taken ontheline6'-6io`fFig.3; f y

Fig.v 7 isa front view of the tail stocl'r,..cor responding to Fig.V `3 but showing the same in its retracted or inoperative position;

6o Fig. 8 is a longitudinal horizontal section ciated that. such formhas been chosen inereequally within the scope ofthe appended l through the casingj21from one end to the:

through the tail stock, takenonthe'line 8- 8 0 fl"ig.-7;v v Fig, 9 is a transverse section, taken on the line 9-9 of Fig. 7; and Fig. 10 is' another transverse section, taken on the line 1Q- 10 ofFig, 7. f- The lathe shown in the drawings includes a main frame 10, a set of rotating knives l1 supported bythe frame, a carriage 12 pivoted at 13v to the frameforniovement toward and away from the latter, a head stock 1 4 Onthe carriage having a rotatingehuck 15, a ltail stock 16 on the carriage having a rotating chuck 17, and a hand lever 18 pivoted at 19 to the frame and connected by a link 20 to the carriage for movingthe latter 12o-bring the piece of rotating stock gripped between the chucks into engagement with. the. rotating lrnives for' the period of the cutting opera 1011. The tail stock l--in which the present invention is embodiedvincludes an elongated circular casing 21; which is provided with a flat outspread attaching base. 22. The ybase 22 rests upon thetop of the carriage adjacent the rightend thereof, and. is held inany desired position longitudinally ofthe carri-age by-bolts 23 which extend into and interlock with a longitudinally extending T-shaped'A slot 24 in the top of the carriage, which slot also serves as a guideway lfor a positioning rib 25 on the bottom ofthe base. J The chuck 17 of the tail stock is. detachably securedY to a long spindle 2.6l whichy extends other and is journaled' in a sleeve 27 onV two spaced series of roller-bearings 28- and/ 29.y The sleeve 27 isshiftable longitudinally within a close fitting cylindrical borenSO formed' in the left end of the casinggfi'nairtight as-f soci-ation therewitl'i, and terminatesiin. antintegralpiston 8 1which is shiftable longitud-i nally within a close tting cylindrical bore' 32 of greater diameter than the bore 3() formed in the center of thev Casing, likewise in air-tight association therewith. i The chuck 17, with the spindle 26 yand the sleevedpiston 3l, is shi-ftableto the. right, from the projected orY operative position shown inf 4 to the retracted orl .inoperative position 10o shown in Fig. 8, against the yielding resistance of a strong coil spring 33 which encircles the spindle and is compressed between a collar 34 keyed to the latter and a plug 35 screwed into th-e right end of the casing. The chuck 17 is caused to shift in the direction described by an inrush of compressed air or other fluid which enters the bore 32 `of the casing through an inlet port 36 and acts against the left side of the piston in the annular chamber 37 formed about the portion of the sleeve`27 which projectsinto the bore 32. When the chuck 17 is to be shifted in the opposite directionfinto engagement with the end of a piece of work, the air in the chamber 37 is released through an exhaust port 38, and the spring 33 projects the chuck with sullicientfforce to embed it lirmly in the end of the work. u

The compressed air which is used in retracting the chuck 17 against the `resistance of the spring 33 isconducted through a liexible hose 39 to apipe 40,r which pipe in turn conducts the air Vto a spring-seated valve 41 which is positioned in va housing 42 attached to the side of the casing 21-in communication with the inlet port 36. When the valve 41 is seated, as shown in Fig. 5, the air is preunder a shoulder 54 on a linger 55.

vented from entering the'chamber 37, but, when such valve is'raised up off of its seatby the engagement of a tappet screwl43 in one end of a rocker 44 with an aligned stem 45 on the valve, as shown in Fig. 9, the air enters the chamber 37 and forces the piston to v the right, thereby retracting the chuck into its inoperative or loading position. Whenever the valv-e 41 is opened, another springpressed valve 46 in communication-with the exhaust port 38 is closed, and, whenever the valve 41 is closed, the valve 46 is opened, the valve 46 being actuated Vby a tappet screw 47 in the opposite end of the rocker 44.

The rocker 44 is pivoted at 48 to the housing 42, and, in the projected position of the chuckf17, is tilted into the air-releasing position shownin Fig. 3 by a spring 49 which is compressed between the rocker and the housing. When the turning' operation on the piece of work has been completed, the operator swings the carriage-12 back away from the frame 10 by moving the hand lever 18, and, when the carriage reaches a certain point in its backward travel, a cam 50 which is pivoted at 51 to a bracketv 52 attached to the front portion of the frame, engages with a roller 53 on one end of the rocker 44, causing the rocker to tilt from the position shown in Fig. 3 to the position shown in Fig. 7 ',-in which latter position the inlet valve 41 is opened, the outlet valve 46 is closed, and Vthe end of the rocker opposite the roller catches The finger 55 isv'pivoted at 56 tothe casing 21 and is connected at its free end with 'a remote-control pull wire 57 leading through a Vthe roller without aecting the latter.

by moving the linger piece 59, and the Vchuck 17 is in consequence forced into'the end of the work, inreadiness for the operator to swing the carriage 12 toward the frame 10 to commence, the cuttingY operation. As the carriage 12 moves forwardly, the roller 53 on the rocker 44 moves into engagement with the back of the cam 50, and the cam, being free to turn in a counterclockwisedirection as viewed in Fig. 2, rides out of the path of The finger 55, instead of being tripped with the linger piece 59 on the hand lever, may be tripped if desired by moving a handle 60,

which rojects forwardly from the lower end of the linger.

The chuck 17 is rotated by a gear 61 whichv is splined ontoy theV collar34 at 62, which arrangement permits the collar to shift axially within the gear when the chuck 17 and spindle 26 are shifted axially. The gear 61 receives its rotary movement from al pinion (not shown) which is splined onto adriving-shaft 63. The chuck 15 of the head stock 14 is similarly rotated from the shaft 63.

I claim:

1. In a lathe, a frame, a plurality of knives mounted for rotary movement on the'frame, a carriage hinged for movement'toward and away from the frame from a loading position to a cutting position and back again, manually operated means for moving the carriage, head and tail stocks having axially aligned work-engaging members forh'olding a piece of work therebetween, spring means `for shifting one of the work-engagingmembers toward the other to grip the work, liuidoperated means for shifting the same workengaging member away from the other to release the work, means for automatically actuating the fluid-operated means vwhen the carriage is moved away from the frame upon completion of the cutting operation, and manually operated means for rendering 'the fluid-operated means inoperativewhereby to allow the spring means to operate.

2. In a lathe, a frame, a plurality of knives mounted for rotary movement on the frame, a carriage hinged for movement'toward and away from the frame from a loading position to a cutting position and back again, a hand lever for moving. the carriage, head and tail stocks having axially aligned work-engaging members for holding a piece of work therebetween,I spring means for -moving one of the work-engaging membersV toward the other to grip the work, Huid-operated means for shifting the same work-engaging member away from the other to lrelease the Work, means for automatically actuating the fiud'- operated means when the carriage is moved away from the frame upon completion of the cutting operation, and a trigger device on the hand lever for rendering the fluid-operated mea-ns inoperative whereby to allow the spring means to operate.

In witness whereof I have hereunto subscribed my name.

DAVID TURCOTT.

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