US2362318A

US2362318A - Turning machine

Info

Publication number: US2362318A
Application number: US381035A
Authority: US
Inventors: Otis E Staples
Original assignee: CLEVELAND HOBBING MACHINE CO
Current assignee: CLEVELAND HOBBING MACHINE CO
Priority date: 1941-02-28
Filing date: 1941-02-28
Publication date: 1944-11-07
Anticipated expiration: 1961-11-07

Description

0. E. STAPLES TURNING MACHINE Nov; 7, 1944.

Filed Feb. 28, 1941 6 Sheets-Sheet l INYENTOR. 077.5 6. 57749455 A TTORNEYS Nov. 7,1944. 0. E. STAPLES TURNING MACHINE 6 Sheets-Sheet 2 Filed Feb. 28, 1941 INVENTOR. 07/5 E 57424 W W m.

m m A Nov. 7, 1944.

o. E. STAPLES 2,362,318

TURNING MACHINE Filed Feb. 28, 1941 e Shets-Sheet 5 INVENTOR. s 5 574F455 ATTORNEYS Nov. 7, 1944. o. E. STAPLES 2,362,318

TURNING MACHI'NE Filed Feb. 28, 1941 6 Sheets-Sheet 4 35 INVENTOR. 0775 ET 574, 4 :5 M WW g j w g ATTORNEYS Nov. 7, 1944. o. E. STAPLES TURNING MACHINE Filed Feb. 28, 1941 6 Sheets-Sheet 5 z wv NOV. 7, 1944. '0, STAPLES 2,362,318

TURNING MACHINE Filed Feb. 28, 1941 6 Sheets-Sheet 6 265 r06 r05 INVENTOR BY 077.5 5574 455 70 M ATTORNEY5 i Patented Nov. 7, 1944 TURNING MACHINE Otis E. Staples, Euclid, Ohio, assignor to The Cleveland Hobbing Machine Company, Cleveland, Ohio, acorporation of Ohio Application February 28, 1941, Serial No. 381,035

.6 Claims.

The present invention relates to machines for working metal, plastics, wood, and the like, and

more particularly to machines for turning material in amanner analogous to that disclosed in copending applications of Theodore F. Carlin, Serial Nos. 242,703 and 249,940, filed November 28, 1938, and January 9, 1939, now Patents Nos. 2,233,398 and 2,233,399, respectively, issued March 4, 1941'. In some respects the present invention may be considered an improvement on the machines disclosed in said applications.

The principal object of the present invention is the provision of a novel improved machine for working metal, plastics, wood, and the like which will be rugged in construction and reliable in operation, and which has a high production and wherein the operation taking place is performedat or near maximum speed consistent with the material being worked and the tool employed.

The present invention resides in certain details of construction and combinations and arrangements of parts, and further objects and advantages of the invention will be apparent to those skilled inthe' art to which the invention relates from the following description of the preferred embodiment thereof described with reference to the accompanying drawings forming a part of the specification and in which Fig. 1 is a perspective view of a machine embodying the present invention showing the front and left-hand side of the same as viewed from the front;

Fig. 2 is a perspective shown in Fig. 1 showing hand side of the machine;

Fig. 3 is a vertical sectional view with portions in elevation taken approximately through the center line of the machine;

Fig. 4 is a sectional view with portions in elevation approximately on the line 4-4 of Fig. 3;

Fig. 5 is an enlarged view of a portion of the right-hand side of the machine;

Fig. 6 is a vertical sectional view with portions in elevation, taken approximately on the line 6-6 of Fig. 5;

Fig. '7 is a horizontal sectional view with portions in elevation taken approximately on the line 'l'| of Fig; 8';

Fig. 8 is an enlarged view taken approximately on the line 8-4! of Fig. 7;

Fig. 9 is a sectional view with portions in elevation taken approximately on the line 9-9 of Fig. '7; and

Fig. 10 is a wiring diagram of the electric circuits of the machine.-

While the invention is susceptible of embodiview of the machine the front and rightment in various modifications and alternative constructions, it is herein shown and described as embodied in a vertical turning machine wherein the work is rotated about a vertical axis in cutting relation with a. disk-like, face-type tool rotated about an axis at right angles to the axis of rotation of the work, while a relative feed movement is efiected between the blank and cut,- ter in a direction longitudinally of the axis of rotation of the work. The cutter has portions of different radii adapted to turn different diameters on the Work blank, and the speed of rotation of the work blank is varied as the respective portions of the cutter engage the blank so that the. cutting operation is always performed at the maximum cutting speed consistent with other requirements, thereby obtaining maximum production.

Referring to the drawings, the machine shown therein is of the vertical type and comprises a base A which forms a support for a vertical hollow column B which in turn supports a number of machine tool elements including a work head C slidably supported for vertical movement on two pairs of vertically spaced ways Ill and II on the column B, and a tool head D adjustably supported for movement in a horizontal plane in a cylindrical aperture I2 intermediate the ways Ill and l l. The work blank W is supported by a suitable chuck l4 fixed to the upper end of a vertical Work spindle or machine tool element l5 and a center I6" carried by a suitable tailstock I! slidably supported on vertical ways I3 and !9 formed on the side of a work head C. The tailstock H is adapted to be moved vertically and clamped and uncl'amped'with respect to the ways It and if! by a single operating lever 20 The tool T which is semi disk-like in shape is carried by a horizontal tool spindle or machine tool element 2| rotatably supported in a tool head D' and during the cutting operation is slowly rotated about its axis as the work is fed vertically past the same. In the present instance the tool T is adapted to turn a piece of work having four different diameters, I, 2, 3 and 4, and accordingly the tool has four arcuate cutting portions a, b, c, and d, each of different radius. In order to obtain maximum production from the machine, the work spindle I5 is driven by a multiple speed electric motor 22', see Fig. 3, hereinafter referred toas the cut motor, the speeds of which are so adjusted that maximum cutting speed in feet per minute consistent with other conditions, such as, the character of material being turned, the kind of tool employed, the rate of feed, etc, is maintained irrespective of which portion of the work blank is being turned. As shown, the vertical feed movement of the work head C which efiects the feed is produced by a cooperating lead screw 23 and nut 24, the former of which is driven from the work spindle. A high speed reversible electric motor 30, hereinafter referred to as the rapid-traverse motor, operatively connected to the nut 24 provides means for rapidly moving the work head C to bring the work up to the tool at the beginning of the cycle of operations of the machine and for returning the work head to its starting position after the blank has been turned and removed.

The machine is started by pressing a start button 3|, as will be hereinafter fully described, which closes a circuit to the rapid-traverse motor 30 causing the same to rotate the nut 24 to move the work head upwardly at a rapid rate. Just prior to the engagement of the work with the tool, an adjustable stop 32 carried on a bar 33 fixed to the top of the work head C actuates a switch 34, stopping the rapid-traverse motor 39 and starting the cut motor 22. Thereafter the work head C continues to move in an upward direction but at a feed rate, and as the different diameters of the work reach cutting position, the speed of the motor 22, which motor has a limited number of definite speeds as distinguished from a variable speed electric motor having an infinite number of speeds, is automatically changed by a plurality of

adjustable stops

35, 36, 31, and 38 carried by a plate 39 fixed to the work head C. These stops actuate suitable electric speed selection switches 40, 4!, 42 and 43 fixed to the upper part of the column B and connected in the control circuit in a manner hereinafter described.

After the cutting operation is completed the circuit to the cut motor 22 is opened upon the actuation of a travel limit switch 44 by an adjustable stop 45 on the bar 33, whereupon the machine stops. When the start button 3| is again depressed after the blank is removed, the rapidtraverse motor 38 operates in the reverse direction to return the work head C to starting position. In order to increase the flexibility of the machine the control for the cut motor 22 preferably comprises a drum controller, designated generally by the reference character E, through the medium of which control circuits for the motor can be so selected that the motor will go through its cycle of various speeds automatically or any one of its various speeds can be selected. In the latter event the selected speed alone will operate during the entire cutting operation. In addition to the automatic position, designated auto, and the four different speed positions, designated 1, 2, 3, and 4, the drum controller E also has an off position. designated off.

Referring to the specific construction of the machine shown, the work spindle I is rotatably supported by anti-friction bearings in the work head C and is driven from the cut motor 22 which is located within the column B but is fixed to and carried by the work head C through the medium of a bracket 45. The armature shaft 41 of the motor 22 i connected to a short shaft 48 by a coupling 49 of conventional construction. The shaft 48 is rotatably supported in the work head C and has a small gear 50 fixed thereon which is continuously in mesh with a large gear 5! fixed to a shaft 52 also rotatably supported in the work head C and which projects into a gear compartment 53 in the lower front part of the work head C. The shaft 52 is operatively connected to a short shaft 54 through the medium of gears 55 and located within the gear compartment and fixed to the shafts'52 and 54, respectively. The shaft 54 is rotatably supported in the work head C and is provided at the left-hand end, as viewed in Figs. 3 and 4, with a bevel gear 51 continuously in mesh with the bevel gear 58 fixed to the Work spindle 15. The gear compartment 53 is adapted to be closed by a removable cover 59, and the gears therein are preferably operated in oil.

The lead screw 23 is rotatably supported in the work head C against axial movement relative thereto and is rotated at a relatively slow speed and in timed relation to the rotation of the work spindle l5 to effect the feed movement of the work head C by the cut motor 22 to which it is operatively connected by a worm wheel 60 fixed to its upper end, which worm wheel is continuously in mesh with a worm Bl keyed on a hori- Zontal shaft 62 rotatably supported in the work head C. The shaft 52, like the shaft 52, projects through the partition 63 in the work head C which forms the gear compartment 53, and the left-hand end thereof, see Fig. 4, is provided with a gear 64 in mesh with a gear 65 fixed to the shaft 54 to the left of the gear 56.

As previously stated, the nut 24 with which the lead crew 23 cooperates is adapted to be rotated at a high rate of speed to produce a rapid-traverse movement of the work head C in either direction by the rapid-traverse motor 30 which is supported on the bed A within the column B. The armature shaft 66 of the motor 30 is connected by a coupler 61 to a short shaft 58 rotatably supported in a bracket 69 which supports the nut 24. The shaft 68 is provided with a worm, not shown, continuously in mesh with a worm wheel H formed about the circumference of the nut 24. The lead screw 23 is preferably provided with a telescopic guard, designated generally as 12, which prevents the entrance of chips, etc., into the interior of the bracket 69.

The tool spindle 2| is rotatably supported in a cylindrically-shaped tool head D slidably but non-rotatably secured in the aperture l2 in the column B intermediate the ways l0 and I I. The tool head is adapted to be adjusted towards and from the axis of rotation of the work spindle l5 by a lead screw 15 rotatably supported in the column B and continuously in mesh with a suitable nut '16 fixed to the cylindrical rear end of the tool head. The lead screw 15 is provided with a micrometer dial 11 at the front end thereof which end projects through the column B. The tool head is adapted to be clamped in any position to which it is adjusted by a pair of movable clamps 80 and 8| positioned in a suitable aperture formed in the column B and adapted to be moved towards each other so as to clamp the cylindrical shank of the tool head B by a threaded shaft 82 projecting through the clamp member 80 and having threaded engagement with the clamp member 8|. The shaft 82 projects to the outside of the column B and the projecting end thereof is formed with a driving connection to facilitate rotation thereof.

As the work head C moves vertically the tool spindle 2i. and, in turn, the tool or cutter T are C, which learn plate has .a cam slot :85 formed therein and within whichacamroller E181 engages. The cam roller 81 is .adiustahly ifixed .to a rack bar 88 slidably supported in an extension 59 of the tool head D. The :rack teeth M the rack bar 2&8 are continuously in mesh :with a gear 1. 91 fixed to the lower end of the tool spindle 1.1, as viewed in Fig. '7. To provide an adjustment between the roller .8] and the rack rbar 8B, the roller is mounted on .a short shaft 32 fixedf-in -.a movable block or member 03 slldalbly supported in a suitable aperture 94 formed in a rack bar 8"8. The block or member 93 is adapted to be moved relative to the rack bar 88 by a screw 95 having threaded engagement with the member '93 and rotatably supported against axial movement in the rack bar 88. A driving connection on the projecting end of the screw 95 provides means for rotating the same and in turn adjusting the roller 81 with respect to the cutter. In order to eliminate back-lash in the mechanism operatively connecting the tool spindle 21 to the cam plate '85, the tool spindle is continuously urged in a clockwise direction, as viewed in Fig.8 by an air motor I01] located within the column ;B, the piston rod I-0I of which motor is connected by a sprocket chain I02 to a sprocket wheel I03 .fixed to the tool spindle 21. The air motor I00 .is continuously supplied with'air under pressure during the operation of the machine.

The cut motor 22 shown is of the four-speed alternating current type which allows the spindle to be rotated at any of four different speeds, thus producing a machine which .will accommodate the turning of piecesof work'havingfour or less different diameters thereon with the cuttingoperation always being Performed at maximum efficiency. It is tobe understood, however, that a motor having any desired number of speeds can he employed. The type of motor selected will depend upon the particulararticle to be turned. A fourspeed motor is selected in the present instance because four speeds are suflicient toaccommodate most articles which the machine shown is designed t.0 turn. In the event that it is desired to turn an article havin more than .four differ out diameters on the machine shown, two of the diameters which most nearly approacheach other in size can be turned at the same speed or the shortest diameter can be turned at one of the four speeds which is most appropriate.

The relative positions of the .various parts of the machine at the commencement .of .a cycle of operations is shown in Fig. 1. As shown in this figure the work head is at the bottom of its travel and a work blank has been positioned in the work head. The machine is started by depressing the start push button switch 3I located on :a control panel I04 fixed to the left-hand side of the machine in a position readily accessible to the operator. With the drum controller E set at auto, the depressing of the start push button switch 3I closes a circuit from line L-i through normally closed stop push button switch 105, I116, normally open start push button switch 35!, line 101, operating solenoid Hi8 of relay I09, line IIO, contacts III of a travel limit switch M, line H2, overload contacts 96, line H, overload contacts 98, line overload contacts H3, line 1M, overload contacts H5, line I I5, overload contacts II], line H8, overload contacts M9, to L 3. The overload contacts '96, 95, H3, H5, II and H9 are located on motor control panels, hereinafter referred to. The particular motor control panel ton switch .3l is released.

upon which these oizerload contacts :are positioned is :shownin the wiring drawing.

i limergiza tion 0f the operating solenoid \IOB aof relay 11119 =..closes the normally .open :contacts 12D, Inland 1| 22 thereof and opens the normally closed contacts I 23 thereof. The closing .of Lthecontacts I Moi relay 1.09 establishes a circuit from-the :line L-I through the normallyelosed stop ipush button switch :Imi, line .1105, contacts 120, line 12a, operating solenoid I of rapid-traverse motor control panel @I:21i,';line 1121, closed contacts I28 -of change-over switch 314, line II "I, closed contacts .I IeI of travel limit switch 4'4, -line I:I '2, .etc., to Energizationof operating solenoid l 25.of rapid-traverse motor control panel I25c1oses the normally open contacts m, :I3LI and i932, connecting the rapid-traverse motor to the power lines L--rl L-2 and L43 in such a manner that the motor is operated in a direction to rapidly raise the work head C.

Simultaneously with the closing of contacts [38, 11M and :I32 of the rapid-traverse mo'torcontrol panel W26, normally open contacts 133 on the same panel are closed. "Ihese contacts are in parallel circuit with the contacts 120 of relay l 09 and establish va holding circuit for the operating solenoid 1:25 continuing :the operation of the rapid-traverse motor 30 after thestart push buthe closing of the contacts I2II oi. relay 1'09 establishes a circuit from theli-ne Lr- I 'throughthe stop push button switch .1205, line M15, contact bar I35 of drum controller E, line 1I 36,.contacts 12 line 131, operating solenoid L138 Jof relay 139, line -ll'0, closed c0ntacts lr! l of travel limit switch M, line H2, etc, to Energization :of the: operating solenoid .138 .ol relay 139 closes the normally open contacts Iifll and M1 thereof. The contacts Ml are :in parallel circuit-with thecontacts IZ I of relay I99 and the closing of these contacts establishes a holding circuit for the operating solenoid I38 of relay I39 maintaining the solenoid energized after the start push button switch 31 is released. The closing :of contacts I22 of relay ill?! and the closing :of contacts I41 of relay 13 9 do not establishcircuits since these contacts are in series with open contacts M2 of change-over switch 32.

Just prior to the engagement of the work with the tool, the stop 32 actuates th change-over switch 34 to open the closed contacts I28 thereof and close the open contacts I42. The opening of contacts I28 of change-over switch 34 deenergizes the operating solenoid I25 of rapid-traverse mo tor control panel I26 disconnecting the rapidtraverse motor from the lin and allowing the same to stop. The closing of contacts I42 establishes a circuit from the line L-I through the stop push button switch I05, line I06, normally open contacts MI of relay 139, which are now closed, line I43, contact bar 144 of drum controller E, line 145, operating solenoid I46 of relay Ii", Jline I49, closed contacts I42 of change-over switch 3!, line H0, closed contacts III of travel limit switch 44, line I12, etc., to L3.

Energization of the operating solenoid MB of the. relay I41 closes the normally open contacts I50, 151 and I52 thereof. This establishes a. circuit from the line L-I through the stop push button switch I05, wire I06, closed contacts MI, line 1 43', contact bar I 4'4, line "I normally closed contacts I54 of speed selection switch 42 which also includes normally open contacts I56, line I51, contacts I50, line "I58, normall closed contacts I59 of speed selection switch 43 also having normally open contacts I62, line I63, contacts I5I, line I64, contacts I52, line I65, normally open contacts I66 of speed selection switch 40, which contacts by prearrangement are now closed by the stop 35 on the plate 39, line I01, operating solenoid I08 of relay I09, line Il0, closed contacts I II of travel limit switch 44, line II2, etc., to L3. This circuit again closes the normally open contacts of relay I09, contacts I22 of which establish a circuit from the line I31, closed contacts I22 of relay I09, line I61, operating solenoid I68 of motor control panel I69, line I10, normally closed contacts I1I of relay I12, line I49, closed contacts I42 of change-over switch 34, line IIO, closed contacts III of travel limit switch 44, line I I2, etc., to L3.

Energization of the operating solenoid I68 of motor control panel I69 closes th normally open contacts I13, I14, I and I16 thereof, connecting the motor 22 to the power lines LI, L-2 and L3 in such a manner that the motor rotates at one of its four speeds, which speed is hereinafter referred to as the "first speed. Simultaneously with the closing of contacts I13, I14, I15 and I16 of motor control panel I69, normally open contacts I11 are also closed. These contacts establish a holding circuit for the operating solenoid I68 of the motor control panel I69 after the speed selection switch 40 is opened upon movement of the stop 35 away from the operating arm thereof. This holding circuit is from the line LI through stop push button switch I05, line I06, closed contacts I4I of relay I39, line I43, contact bar I44 of drum controller E, line I53, normally closed contacts I54 of speed selection switch 42, line I51, closed contacts I50 of relay I41, line I58, nor mally closed contacts I59 of speed selection switch 43, line I63, contacts I5I, line I64, contacts I52, line I65, contacts I11, line I61, operating solenoid I68, line I10, normall closed contacts I1I, line I49, closed contacts I42, line IIO, closed contacts III, line II2, etc., to L3.

The operating solenoid I 18 of relay I19 is in parallel circuit with the operating solenoid I68 of motor control panel I69 and the relay is actuated simultaneously with the contacts of the motor control panel I69 to open the normall closed cntacts I80 thereof. The contacts I80 of relay I19 are in series circuit with the operating solenoids of the motor control panels. hereinafter referred to, which cause the motor 22 to operate at its third speed and the opening of these contacts makes certain that these operating solenoids will not be simultaneously energized with the operating solenoid I98 of motor control panel I69 which causes the motor to operate at its first speed.

The machine continuesto operate with the cut motor rotating at its first speed until the stop 36 closes the contacts I8I of the speed selection switch 4 I, whereupon a circuit is established from the line LI through the stop push button switch I05, line I06, closed contacts I4I of relay I39, line I43, contact bar I44 of drum controller E, line I53, normally closed contacts I54 of speed selection switch 42, line I51, closed contacts I50 of relay I41, line I58, normally closed contacts I59 of speed selection switch 43, line I63. closed contacts I5I of relay I41, line I64, normall open contacts I8I of speed selection switch 4 I, line I82, operating solenoid I83 of relay I12, line I84, normally closed contacts I 23 of relay I09 which is now deenergized, line I49, closed contacts I 42 of change-over switch 34, line I I 0, closed contacts I II of travel limit switch 44, line IIZ, etc., to L3. Energization of the operating solenoid I83 of relay I12 opens the normally closed contacts HI and I85 and closes the normally open contacts I86 thereof. The opening of the normally closed contacts I1I of relay I12 opens the circuit through the operating solenoid I68 of motor control panel I69, disconnecting the connections to the motor 22 by virtue of which it operates at its first speed. This also deenergizes the operating solenoidI18 of relay I19 allowing the contacts I80 thereof to close.

The closing of the contacts I86 of relay I12 establishes a circuit through the operating solenoid I81 of motor control panel I88 from the line LI, through stop push button switch I05, line I06, closed contacts I4I of relay I39, line I43, contact bar I44 of drum controller E, line I53, normally closed contacts I54 of speed selection switch 42, line I51, closed contacts I50 of relay I41, line I58, normally closed contacts I59 of speed selection switch 43, line I63, closed contacts I5I of relay I41, line I64, contacts I86, line I89, operating solenoid I81, line I84, normally closed contacts I 23 of relay I09, line I49, closed contacts I42 of change-over switch 34, line IIO, closed contacts III of travel limit switch 44, line II2, etc., to L3. Energization of the operating solenoid I81 of the motor control panel I88 closes the normally open contacts I90, I9I, I92 and I93 to the power lines in such a manner that the motor continues to operate but at a different speed, herein referred to as the second speed. Simultaneously with the closing of the contacts I90, I9I, I92 and I93 of motor control panel I88, contacts I94 of the same motor control panel are closed. These contacts are in parallel circuit with the contacts I 86 of relay I12 and establish a holding circuit therearound which maintains the operating solenoid I81 of motor control panel I88 energized after the contacts I8I of speed selection switch 4I have opened by the stop 36 moving clear of the actuating arm of said switch. Operating solenoid I95 of relay I96 is in parallel circuit with the operating solenoid I81 of motor control panel I88 and is energized simultaneously therewith to open the normally closed contacts I91 of said relay, which contacts are in series circuit with the operating solenoid I98 of motor control panel I99 by virtue of which the motor is connected to the lines LI, L2 and L3 in such a manner that it operates at a different speed, hereinafter referred to as its fourth speed, thus eliminating any possibility of the operating solenoid I 98 being simultaneously energized with the operating solenoid I81.

The machine continues to operate with the motor 22 rotating at its second speed until the speed selection switch 42 is actuated by engagement of the stop 31 with the operating arm thereof. Actuation of this switch by the stop 31 opens the normally closed contacts I54 and closes the normally open contacts I56 thereof. The opening of the normally closed contacts I54 of speed selection switch 42 breaks the circuit to the operating solenoid I81 of motor control panel I88, deenergizing the circuits by virtue of which the motor operates at its second speed. The operating solenoid I95 of relay I96 which is in parallel circuit with the operating solenoid I81 of motor control panel I88 is deenergized at the same time, allowing the normally closed contacts I91 of said relay to close. The closing of contacts I56 of speed selection switch 42 establishes a circuit from the line LI, through the stop "push button switch I05, line I06, contacts I4I of relay I39, line I43, contact bar I44 of drum controller E, line I53, contacts I56 of speed selection switch. 42, line 200, normally closed contacts '20I of motor control panel I88, line 202, normally closed contacts I80 of relay I19, line 203, normally closed contacts 204 of motor control panel I99, line 205 operating solenoid 2I0 of motor control panel 2, line 2I2, normally closed contacts I85 of relay I12, line I84, normally closed contacts I23 of relay I09, line switch 34,-line IIO, closed contacts III of travel limit switch 44, line II2, etc., to L-3. The contacts 'I of motor control panel I88, which are now closed, were opened while the motor was operating at 'its second speed, thus preventing any possibility of the operating solenoid 2I0 of motor control panel 2|I being energized simultaneously with the energization of the operating solenoid I81 of the motor control panel I88 by virtue of which the motor is caused to operate at its second speed. In like man- I49, closed contacts 142 of change-over.

ner the contacts 204, which are now closed, will be open when the motor is operating at its t fourth speed, thus preventing simultaneous energization of. the operating solenoid 2I0 of .motor control panel 2-II with the operating solenoid I98 of motor control panel I99.

'Energization of the operating solenoid 2I0 of motor control panel 2 II closes the normally'open contacts 2I5, 2I6, -2I1, 2! and 2'I9 thereof. The I closing of the normally open contacts 2J8 establishes a circuit from the line 205 through the contacts 2I8, line 220, operating solenoid 22I of motor control panel 222 to line 2I2. viously stated, energization of the operating solenoid 2I0 of motor control panel 2II closes the normally open contacts 2I5, H6, and 2I'i thereof and the energization of the operating solenoid 22i of the motor control panel .222 closes the normally open contacts 223, 224 and 225 thereof. The closing of the contacts'2l5, 2i6, 2I1, 223, 224 and 2 25 connects the motor 22 to the source of power in such a manner that the motor operates at a diiferent speed than heretofore, which speed is herein referred to as the third speed. i The closing of normally open contacts -2I9 of motor control panel 2II establishes a holding circuit around the contacts I56 of speed selection switch 42. This maintains the operating solenoids 2I0 and HI of the motor control panels 2H and 222, respectively, energizegl after the contacts I56 have opened upon movement of the stop 31 away from the actuating mechanism of the speed .selection switch 42.

The machine continues to operate with the motor rotating at its third speed until'the speed selection switch 43 is actuated by engagement of the stop 38 with the operating arm thereon. Actuation of this switch by the stop 38 opens the normally closed contacts I59 and closes the normally open contacts I62 thereof. The closing-oi the normally open contacts I62 of speed selection switch 4'3 establishesa circuit from the line L-I through the stop push button switch I05, line I06, contacts I4I of relay I39, line I43, contact bar, I44 of drum controller E, line I53, contacts I54 of speed selection switch 42, line I51, contacts I50 of relay I41, line I58, contacts I62 of speed selection "switch 43, line 230, normally closed contacts L23I of motor control panel I69, line 232, normally closed contacts I91 of relay I96, line 229', operating solenoid I98 of motor control panel I99, line -2I2, normally closed con- AS pretacts I of relay I12, :line I84, normally closed contacts I23 of relay I09, line .149, contacts I42 'of change-over switch v34, :line H0, 'contacts II I of travel limit switch 44, line I I2, etc., to L-3.

Energization of the operating solenoid 198 of motor control panel .I 99 closes the normally open contacts 233, 234, 235, and 236, and opens the normally closed contacts 204 thereof. The-closingof the normally open contacts 1236 establishes a .circuit for the operatingzsolenoid 240 of motor control panel 24I from the line 230, through line 238, line 2I2 etc., closing the normally

open contacts

242, 243, 244 and 245. The closing of contacts 283,, 234, and235 of motorcontrol panel 499 and contacts 242,243, and 244 of motor control ,panel 24.I connects the cut motor 22 to the lines L-I, L-Z and L3 insucha manner that the motor operates at a difierent speed, herein referred to as the fourth speed. The closing of the normally open'contacts 245 of motor control panel 24I, which are in parallel circuit with the normally :open contacts I62 of speed selection switch 43, maintains closed th circuit to the operatingsolenoids I98 and 240 of the motor control panels I99 and 24! after the contacts I62 open due to the stop .38 moving away therefrom. The'contacts 159 of speed selection switch 43 are in series circuit with the operating "solehold 181 which when energized causes the motor 22 to operateat its second speed and the open- :ing of these contacts prevents energization of the operating solenoid I81 simultaneous with the energization of the operating solenoids I98 and 2400f the motorcontrol panels I99 and 24I.

uAny possibility -of the operating solenoid I68 of the motor control panel L69 or the solenoids .210 and 221 cfthe .motorncontrol panels 2H and 7222, respectively, being "energized simultaneously with the energization of the operating solenoids I98 and 240 of motor controlpanels I99 and 24I,

respectively, is prevented in the manner previcomes to rest. If at any timeduring the operation of the motor 22 at any of its speeds other than the first speed the start button BI is depressed, the motor will drop back to .its first speed by virtue of the closing-0f contacts I22 of relay I09Landthe-op'ening of contacts I 23 of the same relay. The closing of contacts I22 completes the circuit to the necessary relays, etc., to connect the cut motor 22 to the lines L--1I, L2 and L-3 in such a manner that .it operates at its first speed, and thesimultaneous open- .ing of the normally closed contacts I23 breaks the circuit to all other relays, etc., as will be apparent from the wiring diagram. The cut motor 22 then continues to operate at its first speed until one of the speed selection switches M, '42 and 43 .is actuated by its respective-stop, whereupon the motor operates at the selected speed and continues its automatic cycle of operation. Any possibility of energizing the-operating solenoids I98, 240, .2 I0 and 224 of the motor control panels I99, 24I, 2H and 222, respectively, simultaneously with the operating solenoid I81 of motor control panel I88 is prevented :by the normally closed contacts I85 of relay I12, which contacts open along with the closing of contacts I86 which latter contacts energize the operating solenoid I81.

With the work head C at the upper limit of its travel, the Work blank is removed and thereafter the work head is returned to its initial position by again depressing the start push button 3 I. When the start push button switch 3I is now depressed, a circuit is established from the line LI through the stop push button switch I05, line I96, start push button switch 3I, line 241, operating solenoid 248 of motor control panel I 26, line 258, contacts 246 of travel limit switch 44, line I I2, etc., to L3. Energization of the operating solenoid 248 of motor control panel I26 closes the normally open contacts I, 2'52, 253 and 254 thereof. The closing of contacts 25I, 252 and 253 connects the rapid-traverse motor to the lines LI, L2 and L3 in such a manner that it rotates in the opposite direction, that is, in a direction to lower the work head C. The closing of the normally open contacts 254 of the motor control panel I26 which are in parallel circuit with the start push buttonswitch 3| maintains the circuit to the operating solenoid 248 after the start push button switch has been released. As the work head C moves down, the changeover switch 34 is reset by the stop 32 to again close the contacts I28 and open the contacts I 42 thereof. The spindle head continues to move down at a rapid-traverse rate until the travel limit switch 44 is actuated by the stop 32 to open the closed contacts 246 and close the open contacts III thereof. The opening of the contacts 246 breaks the circuit to the operating solenoid 248 of motor control panel I26, stopping the rapid-traverse movement. The electrical circuits have now all been returned to their original positions and the cycle of operations can again be completed by depressing the start push button switch 3|.

As previously stated, the drum controller E has positions to which it can be turned, designated first, second, third and fourth, corresponding with the respective speeds of the cut motor, and when turned to either of these positions the cut motor 22 will operate at the speed selected throughout the entire cutting operation. In all of the above-mentioned four positions, the line I86 is connected to the line I36 by the contact bar 255, thus establishing the same circuits as are established by the contact bar I when the drum controller E is set at auto. When the drum controller E is in first position, the line I43 is connected to the line I61 through the contact bar 256. This establishes a circuit from the line LI through the stop push button switch I85, line I86, contacts I4I of relay I39, line I43, contact bar 256, line I61, operating solenoid I68 of motor control panel I69, line I10, contacts I1l of relay I12, line I49, contacts I42 of changeover switch 34, line IIO, contacts III of travel limit switch 44, line II2, etc., to L3, upon the closing of the contacts I42 of change-over switch 34 which takes place, as previously explained, just prior to the engagement of the work with the cutter. This circuit is maintained throughout the upward continued movement of the work head C as the selection switches for the other speeds are not connected in this circuit. The fact that various selection switches are subsequently actuated has no effect upon the circuit since the circuits for energizing the operating solenoids of other motor control panels are open as long as the operating solenoid of the motor control panel I69 is energized, as previously explained.

When the drum controller E is turned to second position, the contact bar 256 is connected to line I89 in place of line I61. This establishes the operating circuit for solenoid I81 of motor control panel I88 upon the closing of contacts I42 of change-over switch 34 in a manner similar to that previously described with reference to the energization of operating solenoid I68 of motor control panel I69. When the drum controller E is rotated to third position, the contact bar 256 is connected to line 288, and, when rotated to fourth position, the contact bar is connected to line 230 causing the operating solenoids of motor control panels 2H and 222, and I99 and 24I, respectively, upon the closing of contacts I42 of change-over switch 34, causing the cut motor 22 to operate at its third or fourth speed, as the case may be, in a manner similar to that in which it was caused to actuate at its first and second speeds when the contact bar 256 is connected to the lines I61 and I89, respectively.

Coolant for the tool is adapted to be supplied by a pump, not shown on the drawings, which pump is driven by an electric motor 251, the

operation of which is controlled by a motor control panel 258, the operating solenoid 259 of which is connected in the control circuit previously described in such a manner that the motor 251 operates only while the cut motor 22 is operated.

When the operating solenoid 259 of the motor control panel 258 is energized, the normally

open contacts

260, 26I and 262 thereof are closed connecting the motor to the lines L--I, L--2 and L3 causing the same to operate. A snap switch 263 located on the control panel I04 provides means for preventing operation of the motor 251 when it is desired to operate the cut motor 22 without the coolant motor 251. When the switch 263 is closed, a circuit is established from the line I31 through the switch 263, line 265, operating solenoid 259 of motor control panel 253 to line I49. This circuit is in parallel with the operating solenoid I38 of relay I33 when the contacts I42 of change-over switch 34 are closed.

The cut motor 22 is a four-speed alternating current motor of conventional construction. The connections between the motor control panels which actuate the same and the motor are not referred to herein in detail but are well-known in the art and are shown on the wiring diagram. In the wiring diagram, the leads to the motor 22 are designated by the reference characters T-I to Tl4, inclusive. The leads to the motor 30 are designated by the reference characters T-I5, T-I6 and T-I1 and the leads to the motor 251 by the reference characters T-I8, TI9 and T--28. The machine can be stopped at any time by depressing the stop push button switch I05. In the embodiment of the invention shown, only two

adjustable stops

32 and 45 are employed'on the bar 33. In this event the stop 32 performs the dual function of determining the change-over position, that isthe position where the rapid-traverse up movement of the work head C stops and the feed movement starts in the cycle of operations, and the down position of the work head C. In other words, the stop 33 actuates the change-over switch 34 and the travel limit switch 44, the latter when the work head C is moving in a downward direction. Alternately a separate adjustable stop may be used to actuate the change-over switch 34, in which event the sole function of the stop 32 shown would be that of limiting the downward movement of the work head 0.

From the foregoing description of the preferred embodiment of the invention it will be apparent that the objects of the invention heretofore enumerated and others have been accomplished and that applicant has provided a new and improved machine of the character described which is simple and economical in construction and operation and which will have a high production. While the preferred embodiment of the invention has been described with considerable detail, it will be apparent that the invention is not limited to the particular construction shown, for example, a cut motor having any number of different speeds may be employed and work of any shape can be turned. It will also be apparent that the cut motor can be operated at its various speeds in any desired sequence by suitably arranging the stops which actuate the speed selecting switches. As shown the cam plate 85 and the plate 39 which carries the stops or trips for the speed selecting switches are separate from each other and detachably connected to the work head C of the machine. Alternatively the plates may be formed integral in which event they would be removable as a unit. In the latter event the stops or trips for the speed selecting switches can be fixed with relation to the cam as there is always a relationship between the trips for the speed selecting switches and the cam which rotates the tool. Other alternative constructions will be apparent to those skilled in the art to which the invention relates and it is my intention to hereby I cover all adaptations, modifications and uses of the construction disclosed which comes within the practice of those skilled in the art to which the invention relates.

The phrase multiple speed electric motor as used throughout this specification and the following claims, defines an electric motor having a limited number of definite speeds as distinguished from a variable speed electric motor having an infinite number of speeds.

Having thus described my invention, what I claim is:

1. In a machine of the character described, the combination of a frame, a work spindle rotatably supported by said frame, a tool support carried by said frame, a multiple speed alternating current electric motor for rotating said work spindle, means for producing relative movement I between said work spindle and tool support in a direction generally parallel to the axis of rotation of the work spindle whereby tooling carried by said tool support is moved axially along a work blank operatively connected to said work spindle, means for causing the tooling to turn portions of different diameter on the work blank as the relative movement between the tool and work generally parallel to the axis of rotation of the work is effected, an electric control circuit for said motor including means for automatically changing the speed thereof in relation to the diameter of the work being turned, a manually operable device in said control circuit adapted to stop said motor upon being actuated, and means for causing said motor to operate at its slowest speed when again started after being stopped by said device irrespective of the speed at which it was operating at the time said device was actuated.

2. In a machine of the character described, the combination of a frame, a work spindle rotatably supported by said frame, a tool support carried by said frame, a multiple speed alternating current electric motor for rotating said work spindle, means for producing relative movement between said work spindle and said tool support in a direction generally parallel to the axis of rotation of the work spindle whereby tooling carried by said tool support is moved axially along a work blank operatively connected to said work spindle, means for causing the tooling to turn portions of different diameter on the work blank as the relative movement between the work and tooling generally parallel to the axis of rotation of the work is effected, an electric control circuit for said motor including means for automatically changing the speed of the motor in relation to the diameter of the blank being turned, a stop switch in said control circuit adapted to stop said motor upon being actuated, means for causing said motor to operate at its slowest speed when again started after being stopped by the actuation of said stop switch irrespective of the speed at which it was operating at the time said switch was actuated, a manually operable selecting means in said control circuit adapted to render said means for automatically changing the speed of said motor inoperative and for causing said motor to operate at a selected one of its speeds.

3. In a machine of the character described, the combination of a frame, a work spindle rotatably supported by said frame, a tool spindle adapted to carry a disk-like tool having a plurality of radially offset cutting edges along its periphery, means for rotatably supporting said tool spindle by said frame with its axis of rotation at right angles to the axis of rotation of the work spindle and offset therefrom, a multiple speed alternating current electric motor for rotating said work spindle, means for producing relative movement between said work spindle and tool support in a direction generally parallel to the axis of rotation of the work spindle whereby a tool carried by said tool support is moved axially along a Work blank connected to said work spindle, means for rotating said tool spindle during said relative movement between said spindles, an electric con trol circuit for said motor including means for causing said motor to operate automatically at a plurality of different speeds in a predetermined sequence in relation to the rotation of said tool spindle, a manually operable device in said control circuit adapted to stop said motor upon being actuated, and means for causing said motor to operate at its slowest speed when again started after being stopped by said device irrespective of the speed at which it was operating at the time said device was actuated.

i. In a machine of the character described, the combination of a frame, a work spindle rotatably supported by said frame, a tool spindle adapted to carry a disk-like tool having a plurality of radially offset cutting edges along its periphery, means for rotatably supporting said tool spindle by said frame with its axis of rotation at right angles to the axis of rotation of the work spindle and offset therefrom, a multiple speed alternating current electric motor for rotating said work spindle, means for producing relative movement between said work spindle and said tool support in a direction generally parallel to the axis of rotation of the work spindle whereby a tool carried by said tool support is moved axially along a work blank operatively connected to said work spindle, means for rotating said tool spindle during said relative movement between said spindles, an electric control circuit for said motor including means for causing said motor to operate automatically at a plurality of different speeds in a predetermined sequence in relation to the rotation of said tool spindle, a stop switch in said control circuit adapted to stop said motor upon being actuated, means for causing said motor to operate at its slowest speed when again started after being stopped by actuation of said stop switch irrespective of the speed at which it is operating at the time said switch was operated, a manually operable selecting means in said control circuit adapted to render said means for automatically changing the speed of said motor inoperative and for causing said motor to operate at ajselected one of its speeds.

5.!11 a machine of the character described, the combination of a frame, a work head slidably supported by said frame, a work spindle rotatably supported by said work head, a tool spindle adapted to carry a disk like tool having a plurality of radially oiiset cutting edges along its periphery, means for rotatably supporting said tool spindle in said frame with its axis of rotation at right angles to the axis of rotation of the work spindle and offset therefrom, a multiple speed electric motor for rotating said work spindle, means for moving said work head in a direction generally parallel to the axis of rotation of said work spindle whereby a tool carried by said tool spindle is caused to move axially along a work blank operatively connected to said work spindle, means including a non-uniform cam carried by said work head for rotating said tool spindle at variable speed upon movement of said work head, means for initiating actuation of said motor, and means for automatically changing the speed of said electric motor in a predetermined variable sequence but in timed relation to the rotation of said tool spindle, said last mentioned means including electric switching mechanism which when successively actuated causes said motor to operate at a different one of its speeds and adjustable means carried by said work head for actuating said electric switching mechanism.

6. In amachine of the character described, the combination of a frame, a work head slidably supported by said frame, a work spindle rotatably supported by said work head, a tool spindle adapted to carry a disk-like tool having a plurality of radially offset cutting edges along its periphery, means for rotatably supporting said tool spindle in said frame with its axis of rotation at right angles to the axis of rotation of the work spindle and offset therefrom, a multiple speed alternating current electric motor for rotating said work spindle, means carried by said frame for changing the speed of said electric motor, said means including electric switching mechanism which when successively actuated causes said motor to operate at different speeds, means for moving said work head in a direction generally parallel to the axis of rotation of said work spindle whereby a tool carried by said tool spindle is caused to move axially along a work blank supported in said work head and operatively connected to said work spindle, means including a cam for rotating said tool spindle in predetermined relation to the movement of said work head, a plurality of adjustable iembers carried by said work head for actuating said electric switching mechanism in a variable predetermined sequence, and means for rendering said electric switching mechanism inoperative and for causing said motor to operate at any selected one of its speeds.

OTIS E. STAPLES.