US2960951A

US2960951A - Spinning machine

Info

Publication number: US2960951A
Application number: US554190A
Authority: US
Inventors: Jr Charles Bierman
Original assignee: Cincinnati Milling Machine Co
Current assignee: Milacron Inc
Priority date: 1955-12-20
Filing date: 1955-12-20
Publication date: 1960-11-22
Anticipated expiration: 1977-11-22

Description

c. BIERMAN. JR 2,960,951 SPINNING MACHINE 8 Sheets-Sheet 1 CHARLES B/ERMA/vg BY ATTORNEYS.

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INVENTOR. CHAR/ Es B/ERMAN, JR.

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ATTORNEYS.

NOV- 22, 1950 c. BIERMAN, JR 2,960,951

SPINNING MACHINE Nov. 22, 1960 Filed Dec. 20, 1955 C. BIERMAN, JR

SPINNING MACHINE 8 Sheets-Sheet 5 Nov. 22, 1960 Filed Dec. 20, 1955 C. BIERMAN, JR

SPINNING MACHINE' 8 Sheets-Sheet 6 TTOHNEYS.

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ZMMMWW T TURNEYS nited States Patent SPINNING MACHNE Charles Bierman, Jr., Cincinnati, Ohio, assignor t The Cincinnati Milling Machine Co., Cincinnati, Ohio, a corporation of Ohio Filed Dec. 20, 1955, Ser. No. 554,190

4 Claims. (Cl. 113-52) This invention relates to forming machines and more particularly to new and useful improvements in a spinning machine for forming parts out of flat sheet metal on a shaping mandrel.

`One of the objects of this invention is to provide a new `and improved machine of the class described which is automatically operated.

Another object of this invention is to provide a rugged machine for spinning parts out of relatively heavy gage metal with precision and with a minimum of waste.

A further object of this invention is to provide a hydraulically operated machine having opposed spinning heads on opposite sides of a mandrel, and to accurately control their rate of feed to keep them in step so that each will do its equal share of work.

A still further object of this invention is to provide a spinning machine with opposed spinning heads and selective control means so that either one or both heads may be utilized.

An additional object of this invention is to simplify the construction of such machines and make them more readily adaptable to different conditions by providing individual tooling units that are universally adjustable on a flat bed so that they may be set to follow any taper without the use of templates or profiles.

Other objects and advantages of the present invention should be readily apparent by reference to the following speciiication, considered in conjunction with the accompanying drawings forming a part thereof, and it is to be understood that any modications may be made in the exact structural details there shown and described, within the scope of the appended claims, without departing from or exceeding the spirit of the invention.

Referring to the drawings in which like reference numerals indicate like or similar parts:

Figure 1 is a plan view of a machine embodying the principles of this invention.

Figure 2 is a section on the line 2 2 of Figure 1. Figure 3 is a stion on the line 3 3 of Figure 1. Figure 4 is a section on the line 4 4 of Figure 1. Figure 5 is a detail section on the line 5 5 of Figure 4. Figure 6 -is a detail section on the line 6 6 of Figure 5. `Figure 7 is a detail section on the line 7 7 of Figure 2. Figmre 8 is a detail section on the line 8 8 of Figure 2. Figure 9 is a detail section on the line 9 9 of Figure l. Figures 10, l1 and l2 are diagrams of the electrical control circuit.

#Figure 13 is a diagram of the hydraulic control circuit. Figure 14 is a diagrammatic view of the main slide selector switch.

Figure 15 is a diagrammatic view of the cross slide se-V lector switch.

vFigure 16 is a diagram of the control circuit for the headstock motor.

Referring to the drawings, and more particularly to Figures 1 and 2, the machine of this invention comprises in general a large bed plate 10 on a base 10 having mounted along a central axis thereof, a headstock 11 and a tailstock 12 for supporting therebetween a tapered mandrel 13 upon which a Work piece such as 14 is formed.

On the opposite sides of lthe mandrel and mounted on top of the bed are two similar self-contained

tool units

15 and 16, the unit 15 being the rear unit and the unit 16 b eing the front unit. Each unit has a spinning tool 17 which is supported for rotation by the construction shown in Figure 5. Each tool unit is self-contained in that they have their own prime movers for the longitudinal feeding and cross feeding movements. Each unit, such as the unit 16, has a support or bed plate 18 which rests upon the top of the bed 10 and is adjustable thereon to arrange its working axes in suitable angular relation to the axis of rotation of the work so as to be parallel to the taper of the mandrel. To assist in this adjustment an adjusting screw 19 is threaded in a fixture 2li which is fastened to the top of the bed by T-bolts 21 mounted in a T-slot 22 formed on the top of the bed 10. The screw has an operating handle 23 and is connected by a ball joint 24 to a ball socket 25 secured to the plate 18. After adjustment, the unit is bolted to the top of the bed 10 by a series of T-bolts 26 mounted in suitable T-slots formed on top of the bed. The unit 15, although of opposite hand to the unit 16, also has a support or bed plate 27 which is secured to the bed 10 by suitable T-bolts and an adjusting mechanism indicated generally by the reference numeral 28 and, similar to the adjusting mechanism for the unit 16, is secured to the bed 10.

As `shown in Figure 2, the headstock has a spindle 29 journaled therein and, due to the heavy forces involved, the headstock has a double conical anti-friction bearing 30 at the mandrel supporting end and an anti-friction bearing 31 at the other end, as well as an intermediate anti-friction thrust bearing 32 to absorb the end thrust on the mandrel. The end of the spindle is connected by a coupling 33, Figure l, to the output shaft 34 of a variable speed gear box 35. The input shaft 36 of the gear box is connected by a suitable motion transmitting mechanism 37 to a prime mover, such as an electric motor 38. The gear box may be any conventional gear selector box having a gear selector control lever 39 whereby the rate of rotation of the spindle may be changed relative to the motor. The spindle 29 has a face plate 42 secured by suitable bolts 41 to a ange 40 formed on the end of the spindle. The mandrel 13 which, of course, may be of various sizes and tapers, is attached to the face plate 42 by suitable screws 43.

The headstock 11 is iixed to the bed of the machine, but the tailstock 12 is supported on suitable guides 44, as shown in Figure 7, for movement toward and from the end of the mandrel. This movement is eifected hydraulically by a piston 45, as shown in Figure 2, contained in a cylinder 46 secured to the bed, and connected by a piston rod 47 to the depending bracket 48 of the tailstock 12.

fThe tailstock has a spindle 49 journaled therein on antifriction bearings 50 and thrust bearing 51. This spindle has a chuck 52 mounted in the end thereof, and, as shown -in Figure 8, comprises three adjustable jaws 53 and suitable radial adjusting screws 54 in which may be clamped a conical spider 55, which is interchangeable for various sizes of work. In operation, the tailstock is retracted with respect to the mandrel, a work piece blank, such as 14, mounted on a boss 56 formed on the end of the mandrel, and then the tailstock is brought into position to clamp the blank against the end of the mandrel by the spider and With suflicient friction so -that the mandrel, blank, spiderand tailstock spindle are power rotated by the headstock spindle.

'Ihe construction of each tool unit is the same, with therefore a description of one will suiiice for both. The

rear unit 15, as shown in Figures l, 3, and 4, has the support or bed plate 27 on Which is formed guide surfaces 57, 58 and 59, as Shown in Figure 4, it being noted that the vertical guide surface 59 is the one that takes the lateral thrust on the spinning roller 17. A longitudinally movable carriage or main slide 60Y isr formed and shaped to engage these surfaces and to be guided therehy.

Holddown gibs

61 and 62 are provided on each side of the units and suitably secured to support 2,7 to hold them in engagement with the `surfaces 63 and 6,4 respectively of the slide 60. This slide is power reciprocated by a piston 65, Figure 3, contained in a cylinder 66 which is attached to the support 27, and the piston 65 is connected by a piston rod 67 by a suitable connectionV at 68,Y `to the slide 60.

The main slide 60, in turn, carries a cross slide 69, as shown in Figure 4, slidable on suitable guide surfaces 70 formed on the supporting slide 60. Holddown gibs 71 and 72, Figure 3,V are provided on opposite sides of the slide 69 in the conventional manner. The cross slide 69 is actuated by a piston 73 contained in a cylinder 74 which is mounted on a bracket 75 iXed with the slide 60. The piston 73 is connected by a piston rod 76 to the cross slide 69 for actuation thereof. The cross slide 69 has a tool head 77 which supports the spinning roller 17. This head is `angularly adjustable about a pivot in the form of a bolt 78 which is threaded into a nut 79 fixed with the slide 69. Angular 'adjustment of the tool head is elected by a rack and pinion, lthe rack 80 being formed on the tool head 77, and the pinion 81 rotatably supported in engagement therewith on a stud 82 threaded in the slide 69. The gear is operatively connected to a handle 83 for manual rotatable adjustment thereof. The tool is clamped lafter adjustment by a pair of clamping bolts 84 which p-ass through

elongated slots

85 and 86 Yas shown in Figure 1 and are threaded into the base of the slide 69. The spinning or forming roller 17 is mounted in a special bearing construction shown in Figures and 6.

The end of lthe tool head 77 is bifurcated to form

jaws

87 and 8 8, Figure 5, and a removable axial pin 89 is mounted in these jaws. The head 90 of the pin is held against rotation by a set screw 91 threaded in the head 77. The other end of the pin is provided with a large washer 92-and clamping bolt 93. Mounted on the pin 89 is a sleeve 94 having flanges 95 secured to each end and in which are mounted the

inner races

9,6 of tapered roller bearings. The outer races 97 are mounted in suitable spaced relation in a ring 98. This ring has an annular groove or seat 99 for the roller 17, and the roller is held in the seat by a spring washer 100; When it is desired to change the roller 17, the axial pin 89 is removed and the entire -assembly is taken out of the jaws 87 and 8S so that the spring washer 100 may be removed and the roller 17 slid off and replaced by another roller. This makes a simpleV construction for quickly changing, the roller 17.

. For normal operation, the support 27 of unit 15, as well as the support 18 of the unit 16, yare aligned parallel to the taper on opposite sides of the mandrel and; also longitudinally so that spinning tools are positioned to the left beyond the end `of the mandrel and work. After the blank is loaded between the rollers and the end of the mandrel, the cross slides are `advanced to some predetermined position as determined by a positive stop mechanism to determine the work thickness to be spun, because the rollers not only shape the work `but also may reduce the thickness of the original blank. This mechanism is shown more particularly in Figure 9 and comprises a stop bolt 101 which is threaded into the cross slide 69 and locked in position by a locking set screw 102. The other end of the bolt passes freely through a hole 103 in the bracket 75 where it is provided with an adjustable rotatable nut 104 having graduations 105 formed on a ange 106. The flange yabuts a hardllevvd 4 ring 107 countersunk in the part 75 and thereby determines the limit of movement of the slide 69.

Summing up the operationY of the machine thus far, it will be seen that for each new job the operator selects the proper shape of mandrel and attaches it to the face plate of the headstock, and a suitable spider, such as 55, is attached to the tailstock in the manner described. The work piece, such as 14, is then inserted between the end of the mandrel and the tailstock and manually supported in position while the tailstock is advanced to clamp the work blank against the end of the mandrel.

At this time the tool slides are arranged parallel to the taper on the corresponding sides of the mandrel, depending upon its conical angle, and the -tool rollers are positioned at the left of the end of the mandrel so that the work is inserted between the rollers and end of the mandrel, and, if necessary, the angular position of the tool holders is adjusted at this time.

It will be noted from Figure 5 that the periphery of the spnning roller is a conical surface 17a, and that the large end of the cone terminates in a radius ,17b adjacent one side face of the roller, forming -a blunt nose which is the Iactive working part of the tool or roller. 'Ihe tapered surface thus forms a clearance which may be adjustable depending on the langular adjustment of the tool head. There are various factors which may necessitate adjustment such as thertaper Iangle of the mandrel, the type of material, and the amount that the blank is to be reduced in thickness to form the nished part.

The operator starts the headstock rotating and the cross slides advance to positionas determined by the positive stops. The stops determine the wall thickness of the finished product which is usually less than the thickness of the original work blank.Y 4In fact, the nished wall thickness is utilized to determine the thickness of the blank stock from which it is to be formed. Normally, this is done by drawing two parallel lines a unit distance apart, as shown in Figure 2 lat T, and computing the area of the oblique rectangle between the two lines on the finished work and then making the square or rectangle between the two lines on the work stock equal to that same area. This will determine the thickness of the blank.

The longitudinal slides are started and the work spun to the desired shape and wall thickness. Before returning the slides, the tailstock is retracted and the iinished product removed so that it can be done without interference from the rollers. After the work piece has been removed, the longitudinal slides are returned to starting position and the next blank is inserted in the machine.

The power operating mechanism for the machine is illustrated in the form of a hydraulic control circuit shown in Figure 13, and the pilot controls for the various actuating solenoids are governed by an electric control circuit shown in Figure 10, and the pilot controls are governed by an electric control circuit shown in Figures 11 and 12. Each of the operating cylinders previously described have their own reversing valve and a solenoid operated pilot Valve for effecting power shifting of the associated reversing valve. The various solenoids and the switches which effect their operation are shown in Figure l0. All of these switches or contacts are parts of relays found in Figures l1 and 12.

Although means have been provided for individual actuation or jogging of a particular slide which can be designated as manual control, the full operation of the machine is termed herein as automatic cycle operation A selector switch 108 has been provided as shown in Figure 11 for selecting one or the other type of operation. This switch 108, when operated to select manual control, interconnects contacts 109 and 110 to complete a circuit from the power main 211 to line 1111 which is connected in parallel to relays 12CRA and 12CRB and then to the common return power line 102.

- For the purpose of easily locating the various elements in the electrical control circuit it will be. noted that the

power lines

211 and 102 extend through the circuits shown in Figures l0, ll, and l2, and they derive their power from the secondary 112 of a supply transformer indicated generally by the reference numeral 113. rThe reference line E1 has been run parallel with the whole circuit, and each across-the-line sub-circuit from power line 211 to line 102 has been indicated by reference characters on the line E1.

To set the circuit up for automatic cycle operation which will be described lirst and in which it will be assumed that both main slides and cross slides of the tooling units will be operated simultaneously, the selector switch 108 is positioned to close contacts -114 and 115 in line E27 to elect simultaneous operation of relays 13CRA and 13CRB.

Since an interlock has been provided between the tailstock and the cross slides to insure that the tools are not moved into engagement with the work until it is clamped by the tailstock, a selector switch 116 has been provided for closing contacts 117 and 118 in line E33' if the intellock is not desired, or for closing contacts 1 19 and 120 in line E34 if the interlock is desired. The operation of the machine will be described utilizing the interlock in which case the selector switch 116 will be positioned to close the

contacts

119 and 120 in series with the pressure switch 2PS and cycle start control relay 14CR in line E33.

There are two other selector switches shown diagrammatically in Figures 14 and 15 having three positions whereby the front tool slide or the rear tool slide may be selected for individual operation or both tool slides may be selected for simultaneous operation. The main slide selector switch is indicated generally by the reference numerals 121 in line E36, the details of which are shown in Figure 14 and the cross slide selector switch is indicated generally by the reference numeral 1122 in line E49, the details of which are shown in Figure l5. As shown in Figure 14, the switch 121 has three series of contact pads which may be rotatably positioned to close different groups of switches in accordance with the slide or slides to be operated. For operation of both slides, the

pads

123, 124, 125, and 125 shown in Figure 14 are rotated into position so that the pad 123 interconnects contacts 126 and 127, pad 124

interconnects contacts

128 and 129, pad 125

interconnects contacts

130 and 131, and pad 125 interconnects contacts 130 and 131'. To facilitate the description, these sets of con tacts have been indicated as closed in Figure l1 in lines E39, E42, E44, and E46 respectively.

Similarly, the switch 122 is provided with four switch pads for operation of both cross slides simultaneously, the

switch pads

132, 133, 134, and 135 are rotated in position so that pad 132

interconnects contacts

136 and 137, 133 interconnects contacts 13'8 and i139, pad 134 interconnects contacts 140 and 141 and pad 135

interconnects contacts

142 and 143. For convenience, these contacts are shown as closed in lines E50, E53, E55, and E57 in Figure 12.

Having made these selections, the operator clamps the Work blank in the machine by operating the tailstock advance push button 144 which closes contacts 145 and 146 in line E59 and thereby energizes relay 10CR. This relay closes its latching contact CR-1 in line E60 to latch in the relay so that the push button may be released. The relay also opens switch 10CR-3 in line E6v1 to break the circuit to tailstock reverse control relay 9CR. As shown in Figure l0, line E15, switch 10CR-2 is also closed by the relay to energize solenoid 10. Referring to the hydraulic diagram, Figure 13, solenoid 10 shifts the pilot valve plunger 147 to the left because all of the solenoids shown in this figure are of the push type. The pilot valve 147 controls the power shifting of the reversing valve 148 for the tailstock actuating piston 45.

The reversing valve has a pressure port 149 supplied by pump 150, and this port is in the form of an annular andassi` n groove whereby the pressure will continue throngis channel 151l to pressure port 152 of pilot valve 147. Therefore, when the plunger 147 is shifted to the left, the pressure port 152 will be connected to channel 153 and shift the reversing valve plunger 148 to the left against the resistance of centering spring 154. This will introduce pressure from port 149 to channel 155 and thereby to the end of cylinder 46 to advance the tailstock into work clamping position. When the tailstock has completed its movement the pressure in the end of cylinder 46 will build up to a maximum pressure and elect operation of the pressure switch ZPS. This pressure switch, shown in line E34, Figure ll, will close and complete a circuit to the relay 14CR in E33. This relay may now be energized by closing the cycle start button 156. The circuit to this switch was established by the closing of selector switch 13CRA-1 (E33), the normally closed stop button 159 and timer relay switch 4TR-2. The relay 13CRA also closed contacts BCRA-2 in line E38, 13CRA-3 in line E43, 13CRA-4 in line E49, BCRA-5 in line E55 and since relay 13CRB was simultaneously operated at that time, contacts 13CRB-1 in line E60 and 13CRB-2 in line E63 were also closed. Thus, the operator by actuating the push button 156 will close contacts 157 and `158 to energize relay 14CR and close its latching contacts 14CR-1 in line E35 around the starting switch, as well as closing contact MCR-2 in line E36.

The closing of switch 14CR-2, E36, connects power from line 211 to line 211B through closed contact 13CRA-1, cycle stop switch 159, closed contact 14CR-1 and line 160 so that power is now supplied to the closed switches 13CRA-4 in line E49, Figure l2, and 13CRA-5 in line E-55. The limit switches 4LS and 2LS shown in E49 are carried by the longitudinal slides and are held closed by suitable dogs when these slides are in their starting position, while their corresponding switches 4LS-1, E41, and 2LS-1, E46, are held open. Therefore, the circuit is now complete to

contacts

136 and 138 in lines E-50 and E453, and these are connected by the selector switch i122 to

contacts

137 and 139 respectively whereby cross slide control relays SCR and SCR are energized to start the advance of the cross slides toward the Work.

As shown in Figure 10, these relays will close switches SCR-1 in line ES and SCR-1 in line E13 and thereby energize solenoids SOLS and SOLS. These relays will open normally closed contacts SCR-2, E51 and SCR-2, E57 to prevent operation of control relays 6CR and 7CR. Also, cross slide limit switches 6LS (E57) and 7LS (E51) are held open by dogs in their starting position and as soon as the slides move away from the dogs, the limit switches will close. Referring to Figure 13, solenoid 5 pushes the pilot valve plunger 161 to the right, thereby connecting its pressure port 162 to port 163 and thereby, through channel 164, cause shifting to the right of the reverse valve plunger 165 associated with the cross slide 69. The pressure port 162 is supplied by a pump 166 through pressure reducing valve 167, lines 168 and 169, and the annular pressure port groove 170 of the reversing valve and channel 171. When the reverse valve plunger is shifted to the right, the pressure groove 170 is connected to channel 172 and thereby to one end of the cylinder 74 to advance the cross slide 69 to the limit of its movement.

Similarly, the solenoid 8 shifts the pilot valve plunger 173 to the left and connects pressure port 174 to channel 175, thereby shifting the reverse valve plunger 176 associated with the cross slide 69 whereby pressure is connected from the pressure port 177 of the reverse valve through the throttle valve 178 and line 179 to shift the cross slide 69' to the limit of its movement. Thus, both cross slides move simultaneously to advance the tools to working position. The cross slide 69 has limit switches SLS and 6LS associated therewith and when the slide is advanced, limit switch 6LS in E57 assumes a normally closed position, while its other contacts GLS-1 in E63 cross slide 69 advances, it'release'sV limit switch TLSink connect switch' BCRA-2 to the contacts 126- and 128 in lines E39`andfE'42 respectively to start'the*lo'ngitu'dinal slides'60 and 60". These contactsh'avebeen connected by theI selector switch 121 to contacts 1 27 and 129 whereby control relays SCR and ICR lines E38; and'E42 Referring again to Figure 13, solenoid 501.71 will shift thepilot valve plunger180 tothe right connecting pressure port 1 81 to line 1 8 2 and therebytothe left end of the reversing val-

ve plunger

1,83 associated with the longitudinal slide60. This plunger will connect the pressure port 184 to channel 185 and thereby to the end of cylinder 66 to advance the longitudinal slide 60. In the same manner the solenoid SOL-3 will shift the pilot valve plunger 186 to the left and connect pressure port 187 to line 188 and thereby shift the reversing valve plunger 189 associated with the longitudinal slide 60 to the v left whereby fluid pressure from thepressure port 190 will flow through line 191 and advancethe longitudinal slide 60. When these twoslides advance, they will release limit switches 2LS 1 (E46) and 4LS-1 (E41) associated theref with, which will close, but switches 1CR-2and 3CR-2 are open, whereby/ control relays 2CR and 4CR are prevented from operating; and at the end of their travel will open switches ILS-1 and 3LS-1 respectively, in lines E42 and E38 respectively, deenergizing relays 1CR and 3CR. At the Sametime this will close limit switches 1LS2 and SLS-2 inline E55 and complete the circuit from closed switch 1 3CRA-5 to contacts 140 and 142. These contacts are connected by 141 and 143 respectively to control relays 6CR and 7CR in lines E57 and E51 respectively.

This deenergizes solenoids SOL-1 and SOL-3 whereby the reversing

valves

183 and 189 are returned to a central position because all of the reversing valves are spring held in a central position as by

springs

191 and 192. Therefore, the main slides will stop and remain in that position. However, the limit switches have closed contacts ILS-2 and SLS-2 in line E55 and complete a circuit from closed switch 13CRA-5 to switch contacts 140 and 142 which are connected to

contacts

141 and 143, thereby energizing relays 6CR and 7CR. It is to be noted that contacts lCRB and 3C R B in line 48, which were closed during the traversing movement of the main slides, are now open thereby deenergizing relays SCR and SCR so as to close their contacts SCR-2 (E51) and SCR-2 (E57). This will energize solenoids SOL6 and SOL7 and cause return movement of the cross slides whereby limit switches SLS and SLS will be released and limit switches 6LS and 7LS will beoper'ated when the cross slides have completed their movement. Release of limit switches SLS and SLS in line E38 will open the circuit to main slide control relays CRI and CR3. Operation of limit switches 6LS and 7LS will open the circuit to cross slide control relays 7CR and 6CR'in lines E51 and E57 and close the circuit to timer relay 4TR in line E63, closing switch 4TR-1 in line E43. The relays 6CR and 7CR will deenergize solenoids SOL6 and SOL7 whereby the reversing valves for the cross slides will return to neutral position, and the slides will stop in their outward position.

At this point the operator effects retraction of the tailstock by operating the push button 193 in line E59, closing contacts 194 and 195 in' line E61 to energize relay will'bedogv'clolsed atftheendlof c'rossslide advancelandV 9CR. This will close contact 9 CR-1 in line E14 to energize solenoid SOL9 and close latching contacts 9`CR-2`, E62. This sblenoidtwill shiftpilotvalve 1 47 to the right, causing shifting of the reverse valve 148 to the right,'and pressure will be connected to channelz1l96 and cause return movement ofl piston connected to the tailstock. Completion of rfeturn'niovenient ofthe vtailstcck will operate limitswitch 9LS in line E61 whichwillbreak the circuit to relay'9CR' and thereby deenergize solenoid SOL-9 whereupon the reversing yalve 148 will return to a central position.

The parts are now ina position for the operator toremove the finished work piece from the mandrel When this is completed, he operates the main slide returnpush button 197 in line E41 and thereby closes contacts 198 and 199 in line" E43 to complete a ircu i t through 13CRA-3 and closed timer switch 4TR- 1 to switch contacts and 130' in lines' E44and E46 respectively. Since the limit switches 2LSl-1 and 4 L S-1 are normally closed at this time, control relays 2 CR and 4C I R will `be operated to energize' solenoids SOL2 and SOL4 which will operate the reversing

valvesA

183 and 189 to cause the main slides to return to' starting position. In doing so, they will openlimit switches 2L S 1 and-41.841 whereby they will break the circuit to control relays 2CR and 4CR and stop the return movement. The parts are now back in a starting position so that the operator may loadV the next work blank.

Attention is invited to the f act that in order to equalize the load on each ofthe spinning tools so Vthat` each will do its share of the work, the main longitudinal slides must Ybe maintained in Siep even though they are hydraulically operated. This is accomplished inthe present invention by' providing mechanism for maintaining the back pressure in each of the main slide operating cylinders 66 and 66 equal throughout their stroke. The mechanism for doing this includes two balancing Valves shown in Figure 13 and indicated generally by the reference numerals 200 and 201. The returnchannel 202 from cylinder 66, which terminates in port 203 of the reversing valve 183, is connected to port 204 during the working stroke of the slide `60. 'Ihis port is connected by channel 2 05 to port '206 of a rapid traverse control valve indicated generally by the reference numeral 207. The hydraulic shifting of the valve plunger 208 of this valve is controlled by a pilot valve indicated generally by the reference numeral 209 and having a plunger 210 which is actuable by solenoid SOL-14 shown at E30 in Figure 1l.

Normally, these twoV valves are in the position shown in Figure 13 whereby the return tluid from cylinder 66 is directed by Way of valve groove 211 in plunger 208- to port 212 and thus by way of channel 213 to the throttled port 214 of balancing valve 200. At the same time the pressure in groove211 is directed through channel 215,

interconnected ports

216 and 217 of valve 209, channel 218 to cylinder 219 to maintain the valve plunger 208 in its shifted right position. The pressure in channel 213 is also directed through branch channel 220 and choke coil 2 21 to the left end of valve 200 whereby the pressure plus a spring 2'22 maintains the balancing valve plunger 223 constantly urged toward the right to uncover the port 214. The port 214 causes a pressure drop in the fluid passing therethrough', and this fluid continues through the valve groove 224, channel 225 and a low pressure throttle valve 226 to a scavenger pump 227 which is continuously acting to draw uid from channel 228 and return it to the reservoir 229.

The uid returning from cylinder 66' passes through the same type of circuit including channel 230 to reversing valve 189 and thence by return channel 231 to a rapid' traverse control valve 232, the operation of which is governed by a pilot valve 233 operated by solenoid SOL-16. With the valves in their normal position as shown in Figure 13, the uid from channel 231 is di- 9 r'ected to channel 234 and throttle port 235 of the other balancing valve 201. The uid pressure in channel 235 is directed through channel 236, branch channel 237 and choke coil 238 to the left end of valve 201 whereby the pressure plus a spring 239 urges the valve plunger to the right to uncover port 235. An exhaust channel 240 from this valve is connected by a throttle valve 241 to a return channel 242 which eventually is connected to channel 228 and pump 227.

In order to balance the position of the plungers in the respective balancing valves they are cross connected so that the back pressure in one cylinder is balanced against the back pressure in the other cylinder. In other words, the channel 220 which conducts fluid to the left end of Valve 200 also has a connection through choke coil 243 to the right hand end of balancing valve 201. Similarly, the channel 236 which receives the back pressure from cylinder 66 is connected by a choke coil 244 to the right hand end of balancing valve 200. It will now be seen that with respect to balancing valve 200 that the valve plunger thereof is balanced between the back pressure of one cylinder 66 against the back pressure from the other cylinder 66 so that if the back pressure in cylinder 66 should rise above the back pressure in cylinder 66', the plunger 223 would be urged toward the right to reduce the throttling at port 214 and thereby relieve the pressure in cylinder 66 while, at the same time, this same higher pressure would act on balancing valve 201 to urge the plunger thereof to the left and increase the resistance of port 235 and thereby raise the back pressure in cylinder 66.

Similarly, if the back pressure in cylinder 66 should rise above that in cylinder 66, the plunger in balancing valve 201 would be shifted to the right to relieve the pressure in cylinder 66 and also act to shift the plunger 223 in balancing valve 200 to the left to increase the resistance of port 214 and raise the pressure in cylinder 66'. Thus, the back pressure in each feeding cylinder reacts on the other to maintain both of them substantially constant. Thus, the feed rate of one is balanced against the feed rate of the other to maintain the movement of each spinning roller in step and under equal load so that each does its proportionate share of the work.

The rapid traverse valves have been provided to etect fast movement of the longitudinal slides as for set-up purposes, and such movements are effected under manual control. As shown in Figure 11, the solenoids SOL-14, E30, and SOL-16, E32, are connected to a rapid traverse pushbutton control switch 245 in E32 by way of switches lCRB-l and 3CRB-1 respectively.

The rapid traversing movement is eiected in the case of SOL14 by the shifting of the pilot valve 210 to the left, causing the shifting of the valve plunger 208 to the left. Port 206 now becomes connected to port 246, which is connected by channel 247 directly to the return channel 242, thus bypassing the balancing valve 200 and connected throttle valve 226.

Similarly, valve plunger 248 of rapid traverse pilot valve 233 is shifted to the left by SOL16, causing shifting of plunger 249 to the left and connecting return line 231 directly to return line 242, bypassing balancing valve 201 and its connected throttle valve 241.

It will be noted that since only switches 1CRB-1 and 3CRB-1 are provided in the circuit to the solenoids, and operated by relays 1CR and 3CR, rapid traverse of the longitudinal slides can only be obtained in one direction, mainly, in the advance direction of the slides.

As previously set forth, the selector switch 108 may be positioned for manual control at which time relays 12CRA and 12CRB, E25 and E26 respectively, will be energized and relays 13CRA and 13CRB will be deenergzed. This will close switches 12CRA-1, E37, 12CRA-2, E41, 12CRA-3, E51, 12CRA-4, E54, 12CRB-1, E59, and 12CRA4, E42. This will set up two branch manual control circuits in parallel with the 10 two automatic control circuits. With the closing of svsn'tches 12CRA-2 and 12CRA-4, the power line 211 is connected for manual control of the four control relays for the main slides.

In line E41 there is shown serially connected the mainslide advance push button 248, return slide pushbutton 249, jog stop switch 250 and a timer relay switch lTR-l. With all of these switches closed, the push button 248 may be closed to energize the advance control relays KICR and SCR simultaneously if the main slide selector switch 121 is in its center position, as shown, for control of both sides. When this happens, switch ICR-4 and SCR-4, E42, will close and latch in the circuit. It is during this time that the rapid transverse may be eiected. The slides will thus continue to move until the stop button 250 is operated which `breaks the circuit to the two control relays to insure against reoperation should the button be released quickly. The stop switch 250 is provided with a second switch 251 which closes a circuit to timer relay 1TR in E47. This will open its contact 1TR-1 in E41 immediately, but it has a timed closing so as to insure that the latching switches ICR-4 and 3CR-4 are opened and thereby positively break the circuit to the control relays.

Should it be desired =to manually control the other two relays ZCR and 4CR to eiect simultaneous return movement, the pushbutton 249 is operated which completes a circuit through 12CRA-4, because 13CRA-3 is open, and close contacts 198 `and 199 in E43 and upon operation of these two relays they will close their latching switches ZCRA-Z in line E44 and 4CR-2 in line E-45. This movement may be stopped at any time by actuation of the stop switch 250 which will through the timer relay lTR prevent reoperation.

lt will be noted that when the advance switch 248 is closed that it has a second contact 252 which opens the circuit to the reverse control relays to prevent simultaneous operation of all four relays.

As previously mentioned, the rapid advance pushbutton 245, E32, controls operation of the rapid traverse valves, but the direction control valves associated therewith have to be operated also in order that the rapid traverse valves will be eiective. Therefore, the switch 245 is provided with a second contactor 253, E45 which is simultaneously operated by the push button to cornplete a circuit around the advance pushbutton 248 which is normally open in order to energize either one or both of the control relays 1CR and 3CR. Whatever relays are operated, dependent upon the position of selector switch 121, the corresponding switches lCRB-l, E30, and 3CRB-1, E32, associated with relays ICRB and SCRB connected in parallel with relays ICR and 3CR respectively will be selectively closed, thereby eiecting operation of one or both of solenoids SOL14 and SOL16. Stoppage of this rapid movement is effected by stop button 250 in E41.

The same general method of manual control operation applies to the cross slides. In E51 the switch 12CRA-3 is closed upon selection of manual operation which thereby completes the circuit through serially connected timer contacts ZTR-l, stop switch 254, return switch 255, and the advance switch 256. Closing of the advance switch 256 completes a circuit to

contacts

136 and 138 in lines E50 and E53 of drum selector switch 122 which determines whether either or both of these contacts will be connected to

contacts

137 and 139 respectively. One or both of relays SCR and SCR will thus be operated to shift either of the corresponding control valves and simultaneously close latching contacts SCR in E52 and/ or SCR inline E53.

Stoppage is effected by operating pushbutton 254 which has a second contact at 257 in line E58 to operate timer relay 2TR which immediately opens switch 2TR-1 in line E51 and time closes to insure that the latching switches will open in case of quick release of the push button.

To etect return movement of the Vcross slides the pushbutton switch 2 55 is operated, which interconnects contactsV 258 and 259 in E52 to complete a circuit to cross slide reverse control relays 6CR and7CR orwhichever one is selected by the selector switch 122. Stoppage is also eiected in this case by push button 254 in the same manner. The relays 6CR and 7CR have latching contacts 6CR-1 and 7CR-1 in lines E53 and E54 and the circuit to these will be broken by the timer relay contacts 2TR-1 in line E51.

The control circuit for the headstock motor is shown at the bottom of Figure 12 and comprises a pilot circuit 260 having serially connected start and stop switches 261 and 262 respectively which control operation of relay 18CR. This relay has a latching contact 18CR-1 in line E66 for maintaining the relay closed upon release of the start button. The relay 18CR has a second contact 18CR-2 in a control circuit for the headstock motor, and a selector switch 263 is provided in connection therewith and has three positions, the center position being the oi position. lf the switch is moved to close

contacts

264 and 265 the circuit is completed to switch 18CR-2 for continuous operation, or if the switch 263 is moved to close

contacts

266 and 267 the circuit is completed to automatic control switch 14CR-3. The switch 14CR-3 is associated with the cycle control relay 14CR in E33 and thus whenever a cycle is started the switch 14CR-3 will close and start the headstock motor if switch 263 is set for automatic operation.

The two switches 18CR-2 and 14CR*3 are connected is parallel to line 268 which is connected by parallel circuits to control relays 16CR and 17CR. A direction control switch 269 is provided in these parallel circuits so that in one position it closes contacts 270 and 271 to the forward control relay 16CR, and in the other position it closes

contacts

272 and 273 to complete a circuit to the reverse control relay 17CR. The control relay 16CR has a normally closed contact 16CR-1 in series with relay 17CR to preventY its operation when relay 16CR is energized, and relay 17CR has a normally closed contact UCR-1 in series with relay 16CR to prevent its operation when relay 17CR is energized.

Relay 16CR has a contact 16CR2, E9, for energizing solenoid SOL13V and relay 17CR has a contact 17CR-2, E10, for energizing solenoid SOL15, both shown in Figure lO. As shown in Figure 16, these solenoids control reversible operation of the headstock motor 38.

Power for manual control of the tailstock is obtained by the closing of switch 12CRB-1, E59, when 13CRB-1, E60, is open. The relays CR and 9CR in E59 and E61 which control the advance and return of the tailstock have latching relays 10CR-1, E60, and 9CR-2, E62, so the timer relay STR in E62 is provided for operation by closure of switch 274 associated with the stop pushbutton 275. Thus, when this button is operated the timer relay will open its switch 3TR-L1, E59 immediately, and its time closing will insure that the latching contacts are open in case of quick operation of the pushbutton. Y

The automatic operation of the Inachhie has been described in which both tools were utilized simultaneously for forming the work. It may be desirable, however, to utilize just one tool While the other remains idle, and therefore the selector switches 121, E36, and 122, E50 were provided for making this selection.

lf the Yfront tool is to be used, the front main slide 60' and its cross slide 69 are coupled in the circuit, and the rear slides remain idle. In this case the selector switchV 121, Figure 14, is rotated into position so that the switch pads 276, 2.77 and 278 make the necessary connections to control relays 3CR and 4CR to control reversible operation of the longitudinal slide piston 65'. In other words, the switch pad 278 interconnects contacts 1'30 and 131 in E44, and the switch pad 277 interconnects contacts 126 and 127 in E39. This connects the relays SCR and 4CR to the manual control switches in E41 for manual control when 12CRA-2 is closed or for automatic operation when 13CRA-2 in E38 is closed. Since only one set of slides is going to be controlled the limit switch SLS associated with the other set of slides Will never be closed and therefore to establish a circuit the switch pad 276 is provided for shortl circuiting this limit switch by interconnecting

contacts

279 and 280 in line E37.

At the same time the operator adjusts the selector switch 122, Figure 15, to position the

switch pads

281, 282 and 283 for making certain connections in Figure 12 to render the control relays 7CR and 8CR in E51 and E50 respectively elective to control the Ymovements of the cross slide piston 73. The pad 283 interconnects contacts and 141, and pad 282

interconnects contacts

136 and 137 to connect the control relays for manual control by theV switches in line E51 when 12CRA-3 is closed or for automatic operation when 13CRA-4 and 13CRA-5 are closed. The switch pad 281

linterconnects contacts

284 and 285 in line E56 to short circuit the limit switch 1LS-2 which remains open because associated with the idle slide.

When the rear slides are to be utilized alone the selector switches 121 and 122 are rotatably adjusted in the opposite direction to render the front set of slides idle and the rear set of slides active. In this case, the switch 121, Figure 14, is provided with

switch pads

286, 287, and 288. The pad 287

interconnects contacts

128 and 129,

and pad 288 interconnects contacts 130' and 131' to connect control relays 1CR in E42 and 2CR in E46 for manual control by the switches in'E41 when 12CRA- 2 is closed, or for automatic operation when 13CRA-2 and BCRA-3 are closed. The other switch pad 286

interconnects contacts

289 and 290 in E37 to short circuit the limit switch SLS which is idle and remains open during this operation. v

The selector switch 122, Figure l5, has

switch pads

291, 292, and 293, the pad 292 interconnecting

contacts

138 and 139 in E53, and the pad 293 interconnecting

contacts

142 and 143 in line E57 with the result that control relays SCR and 6CR are connected for manual control by the switches in E51 when 12CRA-3 is closed, or for automatic operation when 13CR A-4 and 13CRA-5 are closed. The pad 291

interconnects contacts

294 and 295 in line E56 to short circuit limit switch 3LS-2` which is idle during this operation.

It will be noted from Figure 13 that two pumps, 150

and 166, are provided for `supplying the hydraulic circuit,

and the pump has the greater capacity and when the slides are not being actuated it is desirable to provide some relief for the pump rather than depending upon its relief valve 296, and so a separate bypass to reservoir has been provided comprising the channel 297 which is gonnected to port 298 of a bypass valve 299 having a valve plunger 300 which is shiftable in one direction by the solenoid SOL12 and in the other direction by a spring 301. A return line 302 to reservoir is connected to port Y ports 298 and 303. As shown in Figure 10, the solenoid Y SOL12 in line E19 is connected in parallel to contacts 4CR-3, ICR-3, 2CR-3, SCR-3 and 10CR.3 wherebyv when any of the relays associated with these switches are operated the solenoid will be actuated to isolate the por-ts 298 and 303 and make the pump effective.

What is claimed is: v

1. In a spinning machine having a work formllgmandrel, a bed, and a headstock and tailstock supported, on

the bed in operative engagement with opposite ends. of' saidl mandrel, the combination of tooling units mounted on the bed on opposite sides of said mandrel, each unit Provision is made that whenever any ofV the main including a power operable cross slide mounted on a power operable main slide, a spinning tool carried by the cross slide, means to adjust said umts independently to align the path ot' movement of the main slides parallel to the taper of the mandrel on the respective sides thereof and position the spinning tool opposite the end of the mandrel, a cycle control mechanism for said slides including a cycle starting relay, a control relay for each slide, a control circuit including a cross slide branch circuit and a main slide branch circuit connected in parallel to said cycle starting relay, serially arranged limit switches in the cross slide circuit held closed by the main slides in starting position, serially arranged limit switches in the main slide circuit normally open when the cross slides are in starting position and adapted to be closed thereby upon reaching their advanced position, a iirst switching means for connecting both control relays for the cross slides to the cross slide circuit, and a second switching means for connecting both of said control relays for the main slides to the main slide circuit and for simultaneously bridging the serially arranged limit switches in the cross slide circuit, whereby energization of the cycle starting relay will cause advance of the cross slides, and completion of cross slide advance will cause simultaneous starting of said main slides while maintaining both control relays for the cross slides energized during movement of the main slides.

2. In a spinning machine having a work forming mandrel, a bed, and a headstock and tailstock supported on the bed in operative engagement with opposite ends of said mandrel, the combination of tooling units mounted on the bed on opposite sides of said mandrel, each unit including a power operable cross slide carrying a spinning tool mounted on the main slide, means to adjust said units on the bed to align the path of movement of the main slide parallel to the taper of the mandrel on the respective sides thereof and position the spinning tool opposite the end of the mandrel, a cycle control mechanism for said slides including a cycle starting relay, a control relay for each slide, a control circuit including a cross slide branch circuit and a main slide branch circuit connected in parallel to said control circuit, serially arranged limit switches in the cross slide circuit held closed by the main slides in starting position, serially arranged limit switches in the main slide circuit normally open when the cross slides are in starting position and adapted to be closed thereby upon reaching their advanced position, a irst selector switch for connecting either one or both of the cross slide control relays to the cross slide circuit, a second selector switch for connecting either one or both of the main slide control relays to the main slide circuit whereby upon energization of the cycle starting relay either one or both of the tooling units may be selectively actuated.

3. In a spinning machine having a work forming mandrel, a bed, and a headstock and tailstock supported on the bed in operative engagement with opposite ends of said mandrel, the combination of a tooling unit mounted on the bed on opposite sides of said mandrel, each unit including a power operable cross slide mounted on the main slide, means to adjust said units on the bed to align the path of movement of the main slide parallel to the taper of the mandrel on the respective sides thereof and position the spinning tool opposite the end of the mandrel, a cycle control mechanism for said slides including a cycle starting relay, a control relay for each slide, a control circuit including a cross slide branch circuit and a main slide branch circuit connected in parallel to said control circuit, serially arranged limit switches in the cross slide circuit held closed by the main sides in starting position, serially arranged limit switches in the main slide circuit normally open when the cross slides are in starting position and adapted to be closed thereby upon reaching their advanced position, a rst selector switch for connecting either one or both of the cross slide control relays to the cross slide circuit, a second selector switch for connecting either one or both of the main slide control relays to the main slide circuit whereby upon energization of the cycle starting relay either one or both of tne tooling umts may be selectively actuated, parallel arranged circuits to said branch circuits, a selector switch for connecting a source of power alternately to said parallel arranged circuits or to said branch circuits, and switch means in said parallel arranged circuits for manually controlling the slides individually or in pairs determinative on the setting of said rst and second selector switches.

4. ln a spinning machine having a Work forming mandrel, a bed, and a headstock and tailstock supported on the bed in operative engagement with opposite ends of said mandrel, the combination of a tooling unit mounted on the bed on opposite sides of said mandrel, each unit including a power operable cross slide carrying a spinning tool mounted on the main slide, means to adjust said units on the bed to align the path of movement of the main slide parallel to the taper of the mandrel on the respective sides thereof and position the spinning tool opposite the end of the mandrel, a cycle control mechanism for said slides including a cycle starting relay, a control relay for each slide, a control circuit including a cross slide branch circuit and a main slide branch circuit connected in parallel to said cycle starting relay, serially arranged limit switches in the cross slide circuit held closed by the main slides in starting position, serially arranged limit switches in the main slide circuit normally open when the cross slides are in starting position and adapted to be closed thereby upon reaching their advanced position, a first selector switch for connecting either one or both of the cross slide control relays to the cross slide circuit, a second selector switch for connecting either one or both main slide control relays to the main slide circuit whereby upon energization of the cycle starting relay either one or both of the tooling units may be selectively actuated, parallel arranged circuits to said branch circuits, a selector switch for connecting a source of power alternately to said parallel arranged circuits or to said branch circuits, and switch means in said parallel arranged circuits including advance, return, and rapid traverse switches for manually controlling the slides individually or in pairs determinative on the setting of the lirst and second-named selector switches.

References Cited in the file of this patent UNITED STATES PATENTS 134,938 Seymour Ian. 14, 1873 150,796 Seymour May 12, 1874 259,178 Laurent June 6, 1882 376,167 Seymour Ian. 10, 1888 '1,157,323 Nicholson Oct. 19, 1915 1,828,464 Harrison Oct. 20, 1931 1,836,921 Harrison Dec. 15, 1931 1,922,087 Hiester Aug. 15, 1933 2,343,912 Lauck Mar. 14, 1944 2,429,938 Mansfield Oct. 28, 1947 2,551,716 Allenbaugh May 8, 1951 2,713,283 Lomazzo July 19, 1955 2,720,129 De Hass et al. Oct. 11, 1955 2,720,130 Chang Oct. 11, 1955 FOREIGN PATENTS 914,227 France Oct. 2, 1946